Fault injection molding machine classification

October 22, 2008 on 9:04 pm | In Tech | 1 Comment

Injection molding machine is a wide range of fault could be from a different point of view of its classification.

1. Fault by the occurrence, can be divided into:

(1) gradual onset fault. As a result of the initial injection molding machine performance arising from the gradual deterioration, most of the injection molding machine’s fault belongs to this failure. And the failure of such electronic control, hydraulic machinery parts of the yuan wear, corrosion, fatigue and creep, and so the process is closely related.

(2) sudden failure. Is a variety of factors, as well as the occasional outside influence and the role of co-produced, which went beyond the role of the injection molding machine can bear limit. For example: as a result of entering the bowl-iron overload occur and cause a broken screw; as a result of the breakdown and into the string of high-pressure injection molding machine electronic board. Such failures often occur suddenly, without any prior symptoms.

Unexpected failures occur in the injection molding machine using the stage, often due to the design, manufacture, assembly, as well as material defects, and so on, or operation errors, and regulations.

2. Demarcation according to the nature of the fault can be divided into:

(1) intermittent fault. Injection molding machine in the short term loss of some of its features, debugging will be able to resume a little repair, replacement parts and components do not need to.

(2) permanent failure. Injection molding machine has been damaged in some parts needed to replace or repair can be re-used.

3. Attainment affected by the fault can be divided into:

(1) complete failure. Injection molding machine led to the complete loss of function.

(2) partial failure. Lead to the loss of some of the features of injection molding machine.

4. Fault cause division, can be divided into:

(1) failure of wear and tear. As the injection molding machine failures caused by normal wear and tear.

(2) the wrong use of fault. Because of errors, failures caused by improper maintenance.

(3) the inherent weakness of failure. As the design, injection molding machine so that the emergence of weak links in the use of normal when the Trouble.

5. Failure by the danger of division, can be divided into:

(1) the risk of failure. For example, security systems need to move in failure due to the loss of the protective effect, resulting in personal injury and injection molding machine breakdown; electronically controlled hydraulic system failure caused by the fault, and so on.

(2) of the security failure. For example, security systems without the need for action when action; injection molding machine could not be activated when the start of the fault.

6. Injection molding machine fault by the occurrence and development of the law of division, can be divided into;

(1) random failures. Failure occurred at a time is random.

(2) there are rules of fault. The fault occurred in a certain regularity.

Each has its own failure of the main features of the so-called failure mode, or state failure. A variety of injection molding machine’s fault, it is quite complicated, but we can narrow it down several of the following: abnormal vibration, mechanical wear, the input signal so that computers can not be accepted, no output signal solenoid valve, hydraulic mechanical components break down, the ratio of linear disorders , The hydraulic pressure drop, leakage of hydraulic pump failure, hydraulic noise, circuit aging, abnormal sound, oil degradation, power supply Drop, enlarged board of exporting no SARS, temperature and other out of control. Different types of injection molding machine failure mode of a variety of different proportion. Injection molding machine is a wide range of fault could be from a different point of view of its classification.

1. Fault by the occurrence, can be divided into:

(1) gradual onset fault. As a result of the initial injection molding machine performance arising from the gradual deterioration, most of the injection molding machine’s fault belongs to this failure. And the failure of such electronic control, hydraulic machinery parts of the yuan wear, corrosion, fatigue and creep, and so the process is closely related.

(2) sudden failure. Is a variety of factors, as well as the occasional outside influence and the role of co-produced, which went beyond the role of the injection molding machine can bear limit. For example: as a result of entering the bowl-iron overload occur and cause a broken screw; as a result of the breakdown and into the string of high-pressure injection molding machine electronic board. Such failures often occur suddenly, without any prior symptoms.

Unexpected failures occur in the injection molding machine using the stage, often due to the design, manufacture, assembly, as well as material defects, and so on, or operation errors, and regulations.

2. Demarcation according to the nature of the fault can be divided into:

(1) intermittent fault. Injection molding machine in the short term loss of some of its features, debugging will be able to resume a little repair, replacement parts and components do not need to.

(2) permanent failure. Injection molding machine has been damaged in some parts needed to replace or repair can be re-used.

3. Attainment affected by the fault can be divided into:

(1) complete failure. Injection molding machine led to the complete loss of function.

(2) partial failure. Lead to the loss of some of the features of injection molding machine.

4. Fault cause division, can be divided into:

(1) failure of wear and tear. As the injection molding machine failures caused by normal wear and tear.

(2) the wrong use of fault. Because of errors, failures caused by improper maintenance.

(3) the inherent weakness of failure. As the design, injection molding machine so that the emergence of weak links in the use of normal when the Trouble.

5. Failure by the danger of division, can be divided into:

(1) the risk of failure. For example, security systems need to move in failure due to the loss of the protective effect, resulting in personal injury and injection molding machine breakdown; electronically controlled hydraulic system failure caused by the fault, and so on.

(2) of the security failure. For example, security systems without the need for action when action; injection molding machine could not be activated when the start of the fault.

6. Injection molding machine fault by the occurrence and development of the law of division, can be divided into;

(1) random failures. Failure occurred at a time is random.

(2) there are rules of fault. The fault occurred in a certain regularity.

Each has its own failure of the main features of the so-called failure mode, or state failure. A variety of injection molding machine’s fault, it is quite complicated, but we can narrow it down several of the following: abnormal vibration, mechanical wear, the input signal so that computers can not be accepted, no output signal solenoid valve, hydraulic mechanical components break down, the ratio of linear disorders , The hydraulic pressure drop, leakage of hydraulic pump failure, hydraulic noise, circuit aging, abnormal sound, oil degradation, power supply Drop, enlarged board of exporting no SARS, temperature and other out of control. Different types of injection molding machine failure mode of a variety of different proportion.

The general maintenance of injection molding machine

October 20, 2008 on 9:10 pm | In Tech | 1 Comment

One. In order to increase the work efficiency, the machine could improve the functioning of the time, that day may be close to 24 hours of operation, if 25 months of operation to count, will be accumulated to 600 per month operating hours, so a year will be 7200 hours , And its general comparison of machine tools will be 4 to 5 times the length of time to operate, so as to extend the machine’s limited use of injection necessary for the maintenance of the machine than the average of industry pay more attention to the machine.

II. Maintenance and inspection

2 —– 1 prior to the operation of inspection

(1) of the volume of hydraulic oil inspection

To determine whether the fuel oil played a scale of less than the maximum and minimum limits of the boundaries.

(2) to open and check the temperature

Determine the dryer, feed tubes, die on the electric heating devices are in working order.

(3) the safety doors and emergency stop button to switch on the inspection

(4) low-voltage device to open the mold inspection

Determine the maintenance of low pressure open mold device is a good model.

(5) lubrication and inspection devices

Dayou Cup oil and oil inside of whether or not sufficient, Dayou devices entirely clear whether the pipeline.

(6) activities of the mechanical inspection of all machines on the activities of each machine will need to be appropriate lubrication, and parts of the activities of impurities, such as dust Shiqu, to maintain the activities of friction on the smooth surface cleaning, can not be placed on tools Activities on the site.

(7) the activities of water cooling pipe inspection system to determine there was no leakage, and the adequacy of water in order to maintain the normal cooling efficiency.

(8) examination of a variety of other conditions to set the temperature, pressure, speed, time, distance, and so on are correct.

(9) and hit the limit switch cam and the operation of the inspection check whether or not the priority, and adjust as necessary to impose a fixed, especially when the replacement of mold.

(10) to check the operation of the empty lower pressure shot, manually operated switch to auto-start its running empty for about 10 to 30 minutes and continued to be one of the conditions for stability, you can operate the official.

(11) have a different tone of the normal operation of inspection records sound and carefully whether or not abnormal sound, the sound of a hydraulic pump, the filter can detect blocked the wind suction, internal anomalies, such as wear and tear, the hum of the solenoid valve and combustion , The relay hum show dirt and dust exist between the point of contact, and to seek to prevent injury will be a big help.

2 —- 2 when the shutdown of inspection

(1) clearance of the hopper feed gates, or the lower hopper is heated, depending on the length of downtime ..

(2) and then held on January 2 following the shooting mode.

(3) is open or half-pipe is expected to reduce electric as the length of downtime.

(4) of the Qing taking to deal with rust and mold, depending on the length of downtime ..

(5) to open the cooling water, cut off power supply.

(6) clean-up machine

2 —- 3 regular weekly inspection

(1) of the electric heater of inspection: Check whether there is a broken string of bad wiring or (as the indicator of the total electric amps).

(2) oil inspection: Check whether there is any leakage, even a small amount of oil needed attention.

(3) screws on the part of the check: Check the whole machinery of whether any part of the screw loose.

(4) of electric nozzle check: If adhesive resin in the wire and electric heater at the end of the nozzle, then remove it.

(5) Taichung Airport to clear the backlog of waste oil.

(6) Net cleansing Accessories first six months, every 23 weeks a cleansing on a regular basis, then once every two or three months to clear.

(7), with all of the whole machine.

2 —- 4 monthly check

(1) weekly inspection of projects to do and more stringent inspection of attitude again.

(2) Ground check: check whether the ground connection perfect, part of the terminal is loosening, if not completely grounded, there was fear of electric shock accident.

(3) part of the electrical circuits of inspection: Check whether or not fully inserted relay sockets, dust, water, oil and foreign matter whether or not in contact with some of the sticky, and part of the terminal screw is loosened.

(4) activities of the module and hydraulic motor Block Block sliding foot inspection: Check whether the sliding foot wear, whether or not screw loose.

(5) of the cooler clean and check: The use of underground water, saline water for industrial use, please month will be removed clean cooler, cooler to improve the efficiency and life. Decontamination of the general cleanliness of the water every six months.

2 —- 5 half-yearly check on a regular basis

(1) per month to check the top head, a more stringent attitude to be more precise about the check again.

(2) regular inspection of hydraulic oil: oil pressure on oil companies to the implementation of regular inspections.

(3) examination of the various activities of the machine, whether it is not part of normal wear ..

2 —- 6 regular inspection once a year

(1) for a period of six months to check the top of the head to do more and more stringent attitude to do the inspection.

(2) electric motor of inspection: the use of steel brush or a clean air blowing electric motor cooling part of the entrance aperture. To do any grease and dust blocking the entrance to the promotion of direct motor heat and other heat damage.

(3) the windows are provided in the system of inspection: the machine in a confined stage, equipped with ventilation windows are provided for, it will need to grease and dust cleared, and so on in order to prevent motor overheating as a result of damage or oil temperature rise.

(4) of insulation resistance measurement: the coated wire to a bad year after year to help take the purposes of insulation resistance measurement to prevent accidental leakage and deterioration of early detection for prevention.

Precipitated calcium carbonate and calcium carbonate to distinguish the difference with the method?

October 14, 2008 on 6:22 pm | In Tech | No Comments

Chemically precipitated calcium carbonate and calcium carbonate to be the product of the main process is: calcined limestone, lime digestion, clean milk of lime, lime carbonation, dehydration, dry screening. The density of the calcium carbonate proportion of calcium carbonate to light. White is usually high, the whiteness of national standards is more than 90. Settlement volume higher than 2.5 in general. Fine particle size can do more, such as ultra-fine calcium, the calcium micro-, nano calcium.

Calcium carbonate is used to be the physical approach and calcium carbonate products, typically used for high-purity limestone (such as: calcite, chalk, etc.) to carry out grinding, the density of calcium carbonate than the light to heavy, general whiteness Lower. Settlement low volume. Size is more difficult to do fine (but now flow through the sieve can be very small, but not to nanometer).

LDPE blown film production problems

October 13, 2008 on 8:32 pm | In Tech | 1 Comment

Most of thermoplastics can blow by blow method to produce thin film, blown film is thin plastic tube Jicheng, while it is hot and then use compressed air to blow plastic inflation, then in the shape of cooling after the tube-like film to be manufactured This film’s performance at a film directed with the membrane between the cast: strength than cast film, and sealing membrane worse than the cast.

Blow production of the film there are many varieties, such as low density polyethylene (LDPE), polypropylene (PP), high-density polyethylene (HDPE), nylon (PA), ethylene-vinyl acetate copolymer (EVA), and so on, Here we have used for low density polyethylene (LDPE) film production process and its Common blown failure to carry out a brief introduction.

Polyethylene blown film material of choice

1. The selection of raw materials should be used blown-grade polyethylene resin particles containing Shuanghua’s agent amount, to guarantee the opening of film.

2. Resin particles melt index (MI) can not be too large to melt index (MI) too much, the viscosity of the molten resin is too small, narrow the scope of processing, processing conditions difficult to control, the resin film poor, is not easy to process into Membrane; In addition, the melting index (MI) too much, polymer molecular weight distribution is relatively narrow, less intensity of the film. Therefore, the choice should be melting index (MI) smaller and relatively wide distribution of molecular weight resin raw materials, such films can meet the performance requirements but also ensures that the processing characteristics of the resin. Blow polyethylene film selection of the general melting index (MI) in the range of 2 ~ 6g/10min between the polyethylene material.

Blow process control points

Blown film process is as follows:

Hopper feed on a plastics extrusion materials → Inflation traction Central cooling wind → → herringbone traction roller traction splint → → → film to deal with Corona rolling

However, it is worth pointing out that the blow with the performance of the film production process parameters have a great relationship, in the course of blown film, it is necessary to strengthen the technological parameters of control, regulate the operation process to ensure the smooth progress of production, and Access to high-quality film products. In polyethylene blown film production, mainly to do a good job the following technical parameters of control:

1. Extruder temperature

Blow low density polyethylene (LDPE) film, the general temperature control in crowding 160 ℃ ~ 170 ℃, and must guarantee evenness nose temperature, high temperature extrusion, resin easy to break down film and brittle hair, in particular, So that the longitudinal tensile strength decreased significantly; the temperature is too low, the non-performing plastic resin and can not carry out smooth expansion of the stretch, the film’s low tensile strength and surface gloss and transparency of the poor, even as timber-like ring The pattern is not as well as the melting of the nuclei (fish-eye).

2. Inflation over

Inflation is more than blown film production process control of one of the main points, Inflation refers to the film after the bubble with a diameter of the tube Inflation did not ring the ratio between the diameter. Inflation for the film than the horizontal expansion of the multiple film is actually a horizontal stretch, stretch plastic molecules will have a certain degree of orientation, than Inflation increased, so that the horizontal strength of the film. However, more than Inflation can not be too much, otherwise easily lead to instability in the bubble film, film and prone to wrinkles. As a result, more than Inflation should be the same with traction than it appropriate, in general, low-density polyethylene (LDPE) films than Inflation should be controlled at 2.5 to 3.0 is appropriate.

3. Traction than

Traction than the film refers to the speed traction control and speed crowding ring between the ratio. Traction than the vertical draw ratio, so that the film cited in the direction of taking on the role of orientation with. Traction than the increase, the vertical will also increase the strength and thickness of the film, but if too much traction than, the thickness of the film difficult to control, the film might even pull off, resulting in broken membrane phenomenon. Low density polyethylene (LDPE) film of traction control than the average between 4 to 6 is appropriate.

4. Dew point

Frost also known as the dew point line, referring to the sticky plastic flow into the high-elastic boundaries of the state. Blown in the process of low density polyethylene (LDPE) in the population die from the molten state was out of time, good transparency. When I leave the mold, to wind through the ring of membrane Cooling of the bubble areas Inflation cooling, air cooling to a certain angle and speed of the nose from blowing out of plastic foam, bubble film of high temperature and cooling air Contact, the film bubbles heat the cold air will be taken away, the temperature will drop significantly to the low density polyethylene (LDPE) following the flow temperature, making it the cooling and solidification of blurred. Paoshang blow in the film we can see a transparent and blurred the line between, that is, dew point (or cream that line).

Blown in the process, the dew point of the film on the level of performance to a certain extent. If the dew point, Inflation at the top of the bubble film, the film’s Inflation in the liquid under, so that only Inflation film thinning, and the elements are not subject to the direction stretch, when the film close to Inflation In the cast film. On the other hand, if the dew point is relatively low, Inflation is under the solid-state, this time in a high-elastic-plastic, blowing as horizontal expansion on the same stretch, so that the orientation of molecules, so that the film Inflation close to the performance of Directed film.

The basic properties of the technical requirements

1. And specifications error

Polyethylene film width, thickness should be in line with the requirements of the film Bohou uniform, Wang, vertical Thickness small deviation, and the bias is more evenly distributed.

2. Appearance

Polyethylene plastic film demands a good, non-obvious “Shuiwen” and the “cloud”; film on the surface should be smooth with no wrinkles or only a small number of live-fold; does not allow air bubbles, piercing and cracking phenomenon; no The black spots, impurities, crystal and stiff block; not allowed to have a serious hang-line materials and silk patterns exist.

3. Mechanical properties

After the blow as a result of the polyethylene film used for printing or processing complex, is subject to mechanical force, the requirements of the polyethylene film should be good mechanical properties, including tensile strength, elongation at break, tear Strength several indicators such as the split should be line with the standards.

4. The size of the surface tension

In order for printing ink and adhesive compound used in polyethylene film has a good surface wetting and adhesion, the requirements of the polyethylene film surface tension should be up to the required standard, otherwise it will affect the printing and production of complex smoothly. In general, the surface tension of the polyethylene film should at least reach up to 38 as a result of more than 40 reached as a result of the above better.

Low density polyethylene (LDPE) film blow common faults and solutions

1. Film is too sticky, poor openings

Fault:

① resin material model right, not a blown-class low-density polyethylene resin particles, which does not speak agent or agents of the content on the low side openings;

② resin melting temperature is too high, too much liquidity;

Inflation ③ than too much, resulting in the opening film of variation;

④ cooling too slow to film cooling enough traction in the roller pressure occurred bonded with each other;

⑤ speed traction too.

Solutions:

① replacement resin raw materials, or to the Division of Sino-Canadian fighting a certain amount of open agent;

② out due to lower temperature and the temperature of resin;

③ due to lower than Inflation;

④ to increase air flow and improve cooling effect, to accelerate the speed of film cooling;

⑤ appropriate to reduce the speed of traction.

2. Poor transparency of the film

Fault:

① out of the low temperature, non-performing plastic resin, resulting in blow after the film’s poor transparency;

② than Inflation is too small;

③ cooling effect of the poor, thus affecting the transparency of the film;

④ resin materials in the water with excessive;

⑤ traction too fast, lack of film cooling.

Solutions:

① out to raise the appropriate temperature, so that the plastic resin can be uniform;

② appropriate to raise more than Inflation;

③ to increase air flow and improve cooling effect;

④ of raw materials for processing and drying;

⑤ appropriate to reduce the speed of traction.

3. Film appear fold

Fault:

① uneven film thickness;

② enough cooling effect;

Inflation ③ than too much, causing instability in the bubble film, or so swing back and forth, and prone to wrinkles;

④ splint miter angle is too large, bubble film in the short distance to be flattening, the film is also prone to wrinkles;

⑤ traction on both sides of the pressure roller different side of the high-low side;

⑥ the guide roller between the axis parallel to the non-affected the stability of the peace Zhanxing film, which appeared fold.

Solutions:

① adjust the thickness of the film to ensure uniform thickness;

② improve the cooling effect, be able to guarantee the full film cooling;

③ due to lower than Inflation;

④ words were appropriate to reduce the angle between the splint;

⑤ traction roller pressure adjustment to ensure uniformity of film loading;

⑥ check the orientation of the shaft axis, and parallel to each other.

4, a thin mist Shuiwen

Fault:

① out of the low temperature, bad plastic resin;

② resin damp, moisture content is too high.

Solutions:

① adjustment extruder temperature settings, and appropriate to raise the temperature out.

② resin will dry raw materials, the general requirements of the resin water should not exceed 0.3 percent.

5. Uneven film thickness

Fault:

① I die gap of a direct impact on the uniformity of film thickness uniformity, if I die gap uneven, and some parts of some of the big gap, and some small parts of some of the gap, resulting in more capacity out of a small, formed The film thickness is inconsistent, and some parts of thin, and some parts of thick;

I-mode ② non-uniform temperature distribution, high-low, so that after the blow of the film Bohou uneven;

③ wind cooling of the air supply ring around the volume of inconsistency, caused by the cooling effect of uneven thickness of the film so that the emergence of the phenomenon of uneven;

④ than Inflation and traction than the inappropriate, so that the film thickness of the foam difficult to control;

⑤ speed traction is not constant, constant change, of course, will affect the thickness of the film.

Solutions:

① nose adjustment mouth gap mode, to ensure uniformity throughout the line;

② adjustment mode nose mouth temperature, so that I die temperature part of the uniform;

③ conditioning cooling device to ensure that the air out of the air flow evenly;

Inflation adjusted ④ and traction than the ratio;

⑤ mechanical inspection gear, so that the traction to maintain a constant speed.

6. The thick-film thickness

Fault:

① I-mode space and out of large volume, the thick-film thickness;

② air cooling ring too much air flow, film cooling too quickly;

③ traction too slow.

Solutions:

① mouth gap adjustment mode;

② appropriate to reduce wind ring style, so that the film Inflation further, making it the thickness of some of the thinning;

③ appropriate to increase the speed of traction.

7. Thin-film thickness

Fault:

① I die gap too small, too much resistance, the thin-film thickness;

② wind cooling of the air volume is too small ring, the film is too slow cooling;

③ traction too fast, over-stretched thin, so thin thickness.

Solutions:

① mouth gap adjustment mode;

② appropriate ring wind increased wind, speed up the cooling of the film;

③ appropriate to reduce the speed of traction.

8. The film sealing poor

Fault:

① low dew point, the orientation of polymer molecules, so close to the performance of films directed film, resulting in the reduction of sealing performance;

② than Inflation and traction than the inappropriate (too much), stretch-oriented films took place, thereby affecting the sealing performance of the film.

Solutions:

Central air-conditioning ① the size of the stroke volume, so that the dew point higher, as much as possible in the plastic melting point under Inflation and traction to reduce Inflation and traction caused by the orientation molecular stretching;

② Inflation and traction than the ratio should be smaller, than if Inflation is too large and too fast traction, the film’s over-stretching horizontal and vertical, so that the film’s performance will be become two-way stretch, the film And sealing will deteriorate.

9. Film tensile strength of vertical difference

Fault:

① resin melting temperature is too high, will film the tensile strength of the vertical drop;

② traction slow vertical orientation film role enough so that the vertical variation of the tensile strength;

③ than Inflation too, with more than traction does not match the film so that the horizontal orientation of the role and increase the tensile strength, tensile strength and vertical will be worse;

④ film cooling too fast.

Solutions:

① appropriate to lower the temperature of molten resin;

② appropriate to increase the speed traction;

Inflation adjusted ③ than bring it into line with traction than the suit;

④ due to lower cooling rate.

10. Horizontal film tensile strength poor

Fault:

① traction too fast, with the wind than the expansion of a similar amount, so that fibrosis have a vertical, horizontal on the strength of variation;

② cooling loop cooling wind speed is too slow.

Solutions:

① appropriate to reduce the speed of traction, and make it more than matched by Inflation;

② ring wind increased wind, so that the film Inflation cooled quickly to avoid the higher

The high-temperature shells were stretching orientation.

11. Vesicle membrane instability

Fault:

① extrusion temperature is too high, the flow of molten resin too, the viscosity is too small, prone to fluctuations;

② out of the low temperature, less material;

③ Central air cooling air flow instability, uneven film cooling bubble;

④ by the strong currents of foreign interference and influence.

Solutions:

① out to adjust the temperature;

② out temperature adjustment;

③ check the wind cooling loop to ensure that air traffic around the uniform;

④ prevent and reduce the flow of outside interference.

12, the film surface rough, uneven

Fault:

① low temperature extrusion, plastic resins bad;

② out too fast.

Solutions:

① to adjust the temperature setting out, and appropriately raise the temperature of extrusion, plastic resins to ensure good;

② appropriate to reduce the speed of extrusion.

13. Films have a peculiar smell

Fault:

① resin has a smell of raw materials;

② out of the molten resin temperature is too high, resulting in decomposition of resin, resulting in smell;

③ bubble film cooling enough film of the hot air inside the bubble did not rule out clean.

Solutions:

① replacement resin raw materials;

② out temperature adjustment;

③ improve the cooling efficiency of the air cooling ring, so that the membrane vesicles full cooling.

Injection molding machine downtime Notes

October 9, 2008 on 6:11 pm | In Tech | 1 Comment

If the suspension of operation of the injection molding machine, we will have to be repeated more than Qing spray plastic or plastic injection molding machine through the clean-up material shot cylinder or the remainder of the plastic barrel. Plastic case of fading, the spray is necessary to increase the number of clearance. To carry out minor repairs when; shot of the heater tank is expected to adjust to the lowest level, for example, 150 ℃, so as to minimize the possibility of thermal decomposition.

Thermal stability of the plastic injection molding (such as PS or PE), such as pre-shutdown one night only on the closure of the skateboard at the bottom of the hopper and tank heater, radio material (only open shot of the heater Tsui), radio is expected to spray tank Clean-ching. Tsui shot entirely clean, the barrel as far as possible a high degree of cooling, injection molding machine to be cooling after the closure of all equipment. Injection molding machine will be fully ready once again heating.

If the material shot cylinder barrel or higher temperatures, only the above-mentioned steps will be slightly altered to prevent heat resin decomposition. For example, the closure of radio material tank heater (the only open shot Tsui heater), or a high degree of cooling barrel as far as possible, continuously spray during the clearance of the remaining resin. Hopper shut down at the bottom of the slide, try spray-money bowl with rubber ramps, if smoke-free plastic, the device can be shut down for the next use.

If the plastic injection molding machines in the break down or burn, and there will be change, so that the finished products become waste. Under such circumstances, it would have to completely close the injection molding machine, spraying clean-ching. Prevention is a high thermal stability of the plastic spray-money event of heat-sensitive resin, which then can withstand the heat.

Some plastic (such as POM, PVC) is very easy to break down, if the injection of a sudden on the way down, then continue in the injection before the open shot Tsui heater only when there are plastic shot down Tsui, can be expected to start shooting tank heater. Liu shot cylinder or barrel temperature to be about 140 ℃. And then the temperature raised to the temperature of processing and clearance of the remaining plastic spray as soon as possible. After the spray-ching Add cold water to be plastic. To change the other plastic, the best choice of PS or PE natural, non-grade fire as a spray-money agent; spray-money if the total surplus is expected, the cut would be hasty POM mixed PVC, or mixed one after another.

Downtime or switch to another kind of plastic, to check clearly the steps taken are correct. Materials supplier has published contains sufficient information booklet, before the operation should be carefully read and understand each type of plastic to be “standard step down.” Booklet should be in place next to the injection molding machine for the operators to access at any time.

Plastic bags with identification of toxic hazards?

October 7, 2008 on 6:19 pm | In Tech | No Comments

Many farmers markets, supermarkets are in a plastic bag loaded with food, in fact, there are a lot of toxic plastic bags, especially the colorful plastic color, which is in itself contains a lot of toxins. Because the color of renewable plastic bags belonging to the use of coloring agents usually contain benzo topiramate, is a highly carcinogenic substance, and access to food, could be transferred to the food, people with chronic poisoning. In addition, the latest research shows that plastic products is also a plasticizer carcinogen, and the regeneration process as simple and plastics and other reasons, its plasticizer with food, especially oily food more easily contact effusion.

“People used to use ‘drug bags’, is both a victim of a carcinogen, unwittingly acting as a disseminator of the carcinogen.” Tongji University School of Medicine professor of environmental medicine Shu-Guang Li cautioned that a number of shops as soon as possible with thin The thin, with a sharp smell of renewable plastic bags loaded food like deep-fried dough sticks, carcinogenic substances leaking faster and more dangerous.

In that case, how to identify whether a plastic bag so toxic?

Sensory test: non-toxic plastic bags were white, translucent or colorless and transparent, hand-lubricating sense of touch from time to time. The toxic plastic colors were turbid, or yellow, tacky feel.

Water test: a plastic bag placed in the water, and into the bottom, non-toxic plastic surface can be toxic to sink a plastic bag.

Jitter test: a plastic bag with their hands to seize the end of the shaking force, sent to drug-free clear voice, the voice of those stuffy Shibuya toxic.

Fire detection: non-toxic flammable polyethylene plastic, blue flame, burning like a candle drip like tears, paraffin smell. Toxic PVC plastic is not flammable, which put out the fire away from the issue of irritating odor.

Double-screw extruder process flow

October 6, 2008 on 12:01 pm | In Tech | No Comments

Double-screw extruder process flow


Double-screw extruder

Technological flow sheet

Engaged in technological quality control mainly, work out quality and
craft and control the file , production flow chart , the quality system is
maintained .

Masterbatch of production technology

October 2, 2008 on 10:51 pm | In Tech | No Comments

Color masterbatch with the requirements

Masterbatch pigment used, it should be noted pigment and plastic raw materials, with the relationship between the agent, the main points of their choice, as described below.

(1) of the pigment and resin and can not react to a variety of additives, strong solvent, the migration of small, good heat tolerance and so on. In other words, the masterbatch can not participate in a variety of chemical reactions. Such as carbon black can be controlled by the curing reaction of polyester plastics, polyester so you can not add carbon black pigment.

As the plastic forming a high temperature, the pigment forming in the heating temperature does not break down color. Inorganic pigments generally good heat resistance, organic pigments and dyes less heat resistance, which should be in the selection of varieties of pigment caused enough attention.

(2) of the pigment dispersed, force should be good coloring. Uneven pigment dispersion, the products will affect the appearance of performance; coloring pigment force poor, would increase the amount of pigment, raising the cost of materials. At the same pigment dispersed in various resin and coloring power is not the same, so they should pay attention to the selection of pigment.

The pigment particle size and dispersion relations have, the smaller the particle size pigment, dispersion, the better, the coloring is also strong.

(3) should be aware of the other properties of pigment, such as for use in food, children’s toys on the side of the plastic products, the requirements should be non-toxic pigment; for the electrical side of the plastic products, electrical insulation should choose a good color; Respect for outdoor plastic products, to choose an aging weather-resistant properties of pigment, and so good.

2. Masterbatch production process

Masterbatch production process is very strict requirements, generally wet process. Masterbatch by the water with abrasive material, phase change, washing, drying, granulation formed, is the only way the quality of products can be guaranteed.

In addition to deal with paint in the ground at the same time, but also to carry out a series of testing, such as the determination of the small size sanding, sanding determination of the proliferation of serous performance, sanding determination of the size of solid content as well as the determination of color, such as fineness of the project.

Masterbatch production process is expected in four ways:

(1) ink method: As the name suggests, is in the ink adoption of masterbatch production Colorants production methods, that is, through the three-roll grinding, in the paint coating on the surface layer of low-molecular-weight protective coating. After the fine grinding paste and another carrier resin mixture, then roll plastic Xiaolian II aircraft (also known as twin-roll machine open chain), plastics, the last single screw or twin-screw extruder for granulation.

The process is as follows:
Stir ingredients coarse paste three-roll grinding paste two small plastic roller chain out of grain
(2) Irrigation: paint, water and dispersant through sanding, so that the pigment particles of less than 1μm, and through the phase-transfer law, so that the pigments into the oil phase, and then drying system was masterbatch. When compared to the need to use organic solvents, as well as the appropriate solvent recovery unit. Its flow chart is as follows:
Fine color wash evaporation Nongsu Liao joined the carrier out of dry granulation

(3) legal pinch: The paint is oil-based carrier and mixing, the use of the color characteristics of the oil by make Kneading paint from the wash water into the oil phase. At the same time, the carrier will be oily paint coating on the surface, so that the pigment dispersion stability and cohesion to prevent the paint.

(4) metal soap method: After paint is the size after grinding to reach around 1μm, and to a certain temperature by adding liquid soap, paint particles on the surface of each layer evenly by the wetting liquid soap dispensers to form a layer of liquid saponification, After adding salt solution and in the paint layer on the surface of the saponification reaction and generate a layer of protective coating of metal soap (magnesium stearate), so that so that the ground after the pigment particles will not give rise to the phenomenon of flocculation, and a certain degree of protection Fineness.

3. Masterbatch use Notes

(1) masterbatch stored for a period of time after moisture absorption, in particular, PET, ABS, PA, PC, and so on, the color tablets according to the same drying process and achieve the requirements of water.
(2) with color masterbatch together to achieve the required color must be very careful, and often occurs light and color.
(3) and other additives masterbatch reaction will be, used to pay attention.
(4) than the dilution of the masterbatch selection should be noted. Selection of high dilution ratio, the lower the cost of production, but also by the processing equipment.

How to Color Masterbatch

October 2, 2008 on 8:37 am | In Tech | 1 Comment

high percentage of pigments and additives and thermoplastic resin, as well dispersed by the plastic colorants, their choice of resin stain on the good wetting and dispersion, and coloring materials with good Components : Color + vector + additive = Color Masterbatch use of the advantages of colored thermoplastic commonly used method of coloring: the color pigment and resin colorant grain mixture into a mixing colored plastic, for the molding process.

Coloring the dry powder resins stain color and mix evenly and directly used in the manufacture of plastic products. Color masterbatch today’s most commonly used method of coloring plastics.

By the high percentage of pigments and additives and thermoplastic resin, as well dispersed by the plastic colorants, their choice of resin stain on the good wetting and dispersion, and coloring materials with good compatibility.

Components: Color + vector + additive = Color Masterbatch
The use of the advantages of coloring masterbatch

Thermoplastic commonly used method of coloring:
The color pigment and resin colorant grain mixture into a mixing colored plastic, for the molding process.
Coloring the dry powder resins stain color and mix evenly and directly used in the manufacture of plastic products.

Color masterbatch today’s most commonly used method of coloring plastics. Vector in the spread of colorants, and simple color resin mixture used in the manufacture of plastic products after.
Masterbatch coloring significant advantages include:
Easy to use, the shape of the environment pollution-free.

Color uniformity, stability, improve the quality of plastic parts.
Easily measurable, application of a high degree of automation of production systems forming.
Can be colored, anti-aging agent, anti-static agent in one set, made of multi-function Masterbatch, user-friendly.

How to masterbatch

September 30, 2008 on 10:37 pm | In Tech | No Comments

Masterbatch by the excess chemical additives, dispersants and carriers are resin composition. Masterbatch is the extraordinary amount of paint (dye) attached to the resin contained in uniform and be in the aggregate.
Constitute a major masterbatch

1, Color
General points of organic pigments such as phthalocyanine green, and so on; inorganic pigments such as red iron oxide, titanium dioxide; dyes such as pink to restore the scattered orange and so on. Polyolefins, PVC masterbatch is used in paints, dyes generally can not be said for coloring polyolefins, or give rise to migration seriously.

2, Dispersant
The main color on the surface wetting, the paint will help further spread and stability in the resin, at the same time must be compatible with the resin, color does not affect product quality. Polyolefin masterbatch dispersant generally low-molecular-weight polyethylene wax esters or hardware, such as zinc. Engineering Plastics masterbatch dispersant generally have polar low-molecular-weight polyethylene wax, hard-acid magnesium, calcium, and other hard-ester.

3, The carrier resin
So that the color masterbatch were uniformly distributed and granular. Choice of carriers to be considered with the color of the resin compatibility, but also to consider masterbatch should have a good dispersion, the carrier mobility should be greater than the colored resin, at the same time after being colored does not affect the quality of products. If a larger selection of melt index of its kind polymer, so that the masterbatch melt index was higher in the polymer to ensure that the final products of the same color. PE, PP masterbatch choice LDPE (low density polyethylene) resin as the carrier, PS, ABS masterbatch modified PS choice as the carrier.

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