1. High density polyethylene (HD-PE)
Barrel temperature feeding zone 30~50°(50°)
Zone 1 160~250° (200°)
Zone 2 200~300° (210°)
Zone 3 220~300° (230°)
Zone 4 220~300° (240°)
Zone 5 220~300° (240°)
Nozzle 220~300° (240°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 200~280°C
Barrel constant temperature 200 ° C
Mold temperature 20~60°C
Injection pressure has good flow performance, avoiding excessive flow pressure of 80~140Mpa (800~1400bar); except for some thin-walled packaging containers, it can reach 180Mpa (1800bar)
The pressure holding pressure is high, and it takes a long time to hold the product. The dimensional accuracy is the key factor; about 30%~60% of the injection pressure.
Back pressure 5~20Mpa (50~200bar); the place where the back pressure stone is too low is easy to cause product weight and dispersion unevenness
Injection speed requires high injection speed for thin-walled packaging containers; medium injection speed is often more suitable for other types of plastic products
High screw speed (line speed of 1.3m/s) is permissible, as long as the plasticizing process is completed before the end of the cooling time; the torque requirement of the screw is low.
Metering stroke 0.5~4D (minimum~max); it is important that the 4D metering stroke provides a sufficiently long dwell time for the melt.
Residual material amount 2~8mm, depending on metering stroke and screw diameter
Pre-bake is not required; if the storage conditions are not good, it can be dried at 80 ° C for 1 h.
Recovery rate can reach 100% recycling
Shrinkage 1.2~2.5%; easy to twist; high degree of shrinkage; no shrinkage after 24h (shrinkage after molding)
Gate system point gate; heated hot runner, insulated hot runner, in-situ sleeve; relatively small cross-sectional area, sufficient for thin section products
No special cleaning work is required for other machine materials during the machine shutdown period; PE temperature rise resistance
Standard screw for barrel equipment, three-stage screw for standard use; special for packaging container type, mixing section and shear section geometry (L=25:1), straight-through nozzle, check valve
Second, polypropylene (PP)
Barrel temperature feeding zone 30~50°(50°)
Zone 1 160~250° (200°)
Zone 2 200~300° (220°)
Zone 3 220~300° (240°)
Zone 4 220~300° (240°)
Zone 5 220~300° (240°)
Nozzle 220~300° (240°)
The temperature in parentheses is recommended as the basic basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 200~280°C
Barrel constant temperature 200 ° C
Mold temperature 20~70°C
Injection pressure has good flow performance, avoiding excessive flow pressure of 80~140Mpa (800~1400bar); except for some thin-walled packaging containers, it can reach 180Mpa (1800bar)
The holding pressure prevents the product from shrinking, and it takes a long time to hold the product (about 30% of the cycle time), about 30%~60% of the injection pressure.
Back pressure 5~20Mpa (50~200bar)
Injection speed requires high injection speed (with accumulator) for thin-walled packaging containers; medium injection speed is often more suitable for other types of plastic products
High screw speed (wire speed of 1.2m / s) is allowed, as long as the plasticization process is completed before the end of the cooling time
Metering stroke 0.5~4D (minimum~max); it is important that the 4D metering stroke provides a sufficiently long dwell time for the melt.
Residual material amount 2~8mm, depending on metering stroke and screw speed
Pre-bake is not required; if the storage conditions are not good, it can be dried at 80 ° C for 1 h.
Recovery rate can reach 100% recycling
Shrinkage rate 1.2~2.5%; high degree of shrinkage; no shrinkage after 24h (shrinkage after molding)
Gate system point gate or multi-point gate; heated hot runner, insulated hot runner, in-situ sleeve; gate location is at the thickest point of the product, otherwise it is prone to large shrinkage
No special cleaning work is required for other machine materials during the machine shutdown period; PE temperature rise resistance
Standard screw for barrel equipment, three-stage screw for standard use; special for packaging container type, mixing section and shear section geometry (L=25:1), straight-through nozzle, check valve
Third, polystyrene (PS)
Barrel temperature feeding zone 30~50°(50°)
Zone 1 160~250° (200°)
Zone 2 200~300° (210°)
Zone 3 220~300° (230°)
Zone 4 220~300° (230°)
Zone 5 220~300° (230°)
Nozzle 220~300° (230°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 200~280°C
Barrel constant temperature 200 ° C
Mold temperature 15~50°C
Injection pressure has good flow performance, avoiding excessive flow pressure of 80~140Mpa (800~1400bar);
30%~60% of the pressure of the pressure holding pressure; relatively short holding time
Back pressure 5~10Mpa (50~100bar); in the place where the back pressure is too low, bubbles are easily generated in the melt (there are gray and black lines in the product)
Injection speed is generally faster, multi-stage injection molding is based on the shape of the product; for thin-walled packaging containers should be as fast as possible, if necessary, using accumulators
High screw speed (maximum line speed of 1.3m/s) is allowed, but for good results, the plasticizing process should be as slow as the cooling time.
Metering stroke 0.5~4D (minimum~max); it is important that the 4D metering stroke provides a sufficiently long dwell time for the melt.
Residual material amount 2~8mm, depending on metering stroke and screw speed
Pre-bake is not required; if the storage conditions are not good, it can be dried at 80 ° C for 1 h.
Recovery rate can reach 100% recycling
The shrinkage rate is 1.3~0.6%;
Gate system point gate; heated hot runner, insulated hot runner, in-situ sleeve; relatively small cross section is sufficient
No special cleaning work is required for other machine materials during the machine shutdown period; PE temperature rise resistance
Standard screw for barrel equipment, straight-through nozzle, check valve
Fourth, PVC - unplasticized (PVC-U)
Barrel temperature feeding zone 30~50°(50°)
Zone 1 140~160° (150°)
Zone 2 165~180° (170°)
Zone 3 180~210° (190°)
Zone 4 180~210° (200°)
Zone 5 180~210° (200°)
Nozzle 180~210° (200°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 210~220°C
Barrel constant temperature 120 ° C
Mold temperature 30~60°C
Injection pressure 80~160Mpa (800~1600bar);
The holding pressure can not be set too high, 40~60% of the injection pressure, based on the module and gate
Back pressure In view of its thermal sensitivity, it is critical to properly set the back pressure; the heat generated by the screw friction (closed heat input control) is better than the heat generated from the barrel heating ring; the back pressure does not exceed 30Mpa (300bar)
Do not set the injection speed too high and be careful of the shearing effect of the material; where the product is prone to denaturation or sharp edges, multi-stage injection speed should be absolutely required.
The screw speed is set to the minimum allowable setting, and the maximum speed of the line speed is 0.2 m/s; if necessary, the plasticization is delayed to ensure that the metering operation can be completed at the low screw speed before the end of the cooling time in the case of a long cooling time; Need high torque to maintain uniformity
Measuring stroke 1.0~3.5D
The amount of residual material should be small: 1~5mm, depending on the metering stroke and screw diameter; the screw ensures minimum fit when installing the barrel
Pre-drying If the storage conditions are not good, it can be dried at 70 ° C for 1 h.
Recycling rate allows recycling of materials without thermal decomposition
The shrinkage rate is 0.5~0.7%;
Gate system sprue; chip gate or wafer gate is better, point gate can also be used for small products; gate should have arc transition in the direction of product
When the machine is shut down, the heating is turned off, no back pressure is plasticized, the solution is allowed to stand for 2~3min, and then the machine is operated slowly like extrusion; the operation is repeated until the temperature of the barrel drops to 160 °C, then the excess material is squeezed out and emptied. Cartridge
The barrel equipment is a rigid PVC screw; some require a heating coil and a cold air device; the screw is closed with a screw groove, and the through nozzle
5. Plasticized polyvinyl chloride (P-PVC)
Barrel temperature feeding zone 30~50°(50°)
Zone 1 140~160° (150°)
Zone 2 150~180° (165°)
Zone 3 160~220° (180°)
Zone 4 160~220° (190°)
Zone 5 160~220° (190°)
Nozzle 160~220° (190°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 200~220°C
Barrel constant temperature 120 ° C
Mold temperature 30~50°C
Injection pressure 80~120Mpa (800~1200bar);
30%~60% of the pressure of the pressure holding injection
Back pressure 5~10Mpa (50~100bar)
Injection speed In order to obtain a good surface quality, the injection should not be too fast (multi-stage injection if necessary)
The screw speed is set to medium screw speed, and the maximum folding line speed is 0.5m/s.
Measuring stroke 1.0~3.5D
Residual material amount 2~6mm, depending on metering stroke and screw diameter
Pre-drying is not required, only in storage conditions, it can be dried at 70 ° C for 1 h.
Recycling rate allows recycling of materials without thermal decomposition
Shrinkage rate 1~2.5%;
The gate system can also use a point gate for small products; the gate should have a circular arc in the direction of the product.
The machine is shut down during the shutdown period, no back pressure plasticizing, and several extrusion cycles
Barrel equipment standard screw, check ring, straight-through nozzle
Six, nylon 6 (PA6)
Barrel temperature feeding zone 60~90° (70°)
Zone 1 230~240° (240°)
Zone 2 230~240° (240°)
Zone 3 240~250° (250°)
Zone 4 240~250° (250°)
Zone 5 240~250° (250°)
Nozzle 230~240° (250°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Feed zone and zone 1 temperature directly affect feed efficiency; increasing these temperatures can make feed more even
Melt temperature 240~250°C
Barrel constant temperature 220 ° C
Mold temperature 60~100°C
The injection pressure is 100~160Mpa (1000~1600bar). If it is processing long-flow products with thin cross-section (such as wire tie), it needs to reach 180Mpa (1800bar).
The pressure of the pressure is 50% of the injection pressure; due to the relatively fast condensing of the material, a short dwell time is sufficient. Reduce the pressure of the pressure to reduce the stress inside the product
Back pressure 2~8Mpa (20~80bar) o, need to be adjusted accurately, because the back pressure is too high, it will cause uneven plasticization
The injection speed is recommended to use a faster injection speed; the mold has good ventilation or the coking phenomenon is easy on the product.
The screw speed of the screw is high, and the linear speed is 1m/s. However, it is better to set the screw speed lower, as long as the plasticizing process can be completed before the end of the cooling time;
Measuring stroke 0.5~3.5D
Residual material amount 2~6mm, depending on metering stroke and screw diameter
Pre-drying is dried at 80 ° C for 4 h, except that it is directly fed from the charging container; nylon is water-absorbent and should be stored in a moisture-proof container; the water content exceeding 0.25% will cause molding changes.
Recovery rate can be 10% return
The shrinkage rate is 0.7~2.0%; or 30% glass fiber is added, the shrinkage is 0.3%~0.8%; if the temperature is more than 60°C, the product should be gradually cooled; gradually cooling can reduce the shrinkage after molding, that is, the product Performance is better dimensional stability and small internal stress; steam method is recommended; nylon products can be inspected by flux
Gate system point type, latent type, chip type and sprue can be used; blind hole and gate socket are recommended to break the cold point; hot runner can be used; hot runner should be provided due to the narrow processing temperature range of the melt Closed loop temperature control
The machine does not need to be cleaned with other materials during the shutdown period; the melt remains in the barrel for up to 20 minutes, after which thermal degradation is easy to occur.
Standard screw for barrel equipment, high plasticizing capacity for special geometry; anti-reverse ring, straight-through nozzle; for the addition of glass fiber reinforcement, high wear-resistant bimetallic barrel
Seven, nylon 66 (PA66)
Barrel temperature feeding zone 60~90° (80°)
Zone 1 260~290° (280°)
Zone 2 260~290° (280°)
Zone 3 280~290° (290°)
Zone 4 280~290° (290°)
Zone 5 280~290° (290°)
Nozzle 280~290° (290°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Feed zone and zone 1 temperature directly affect feed efficiency; increasing these temperatures can make feed more even
Melting temperature 270~290°C
Barrel constant temperature 240 ° C
Mold temperature 60~100°C
The injection pressure is 100~160Mpa (1000~1600bar). If it is processing long-flow products with thin cross-section (such as wire tie), it needs to reach 180Mpa (1800bar).
The pressure of the pressure is 50% of the injection pressure; due to the relatively fast condensing of the material, a short dwell time is sufficient. Reduce the pressure of the pressure to reduce the stress inside the product
Back pressure 2~8Mpa (20~80bar) o, need to be adjusted accurately, because the back pressure is too high, it will cause uneven plasticization
The injection speed is recommended to use a faster injection speed; the mold has good ventilation or the coking phenomenon is easy on the product.
The screw speed of the screw is high, and the linear speed is 1m/s. However, it is better to set the screw speed lower, as long as the plasticizing process can be completed before the end of the cooling time;
Measuring stroke 0.5~3.5D
Residual material amount 2~6mm, depending on metering stroke and screw diameter
Pre-drying is dried at 80 ° C for 4 h, except that it is directly fed from the charging container; nylon is water-absorbent and should be stored in a moisture-proof container; the water content exceeding 0.25% will cause molding changes.
Recovery rate can be 10% return
The shrinkage rate is 0.7~2.0%; or 30% glass fiber is added, the shrinkage is 0.4%~0.7%; if the temperature is more than 60°C, the product should be gradually cooled; gradually cooling can reduce the shrinkage after molding, that is, the product Performance is better dimensional stability and small internal stress; steam method is recommended; nylon products can be inspected by flux
Gate system point type, latent type, chip type and sprue can be used; blind hole and gate socket are recommended to break the cold point; hot runner can be used; hot runner should be provided due to the narrow processing temperature range of the melt Closed loop temperature control
The machine does not need to be cleaned with other materials during the shutdown period; the melt remains in the barrel for up to 20 minutes, after which thermal degradation is easy to occur.
Standard screw for barrel equipment, high plasticizing capacity for special geometry; anti-reverse ring, straight-through nozzle; for the addition of glass fiber reinforcement, high wear-resistant bimetallic barrel
Eight, polybutylene terephthalate (PBT)
Barrel temperature feeding zone 50~70° (70°)
Zone 1 230~250° (240°)
Zone 2 240~260° (250°)
Zone 3 250~260° (260°)
Zone 4 250~260° (260°)
Zone 5 250~260° (260°)
Nozzle 250~260° (260°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melting temperature is 250~260°C, the molding range is narrow; below 240°C, it is easy to coagulate, and above 270°C, it is easy to produce thermal degradation.
Barrel constant temperature 210 ° C
Mold temperature 60~80°C
Injection pressure 100~140Mpa (1000~1400bar)
50%~60% of the pressure of the pressure holding injection
Back pressure 5~10Mpa (50~100bar) to avoid friction heat
The injection speed requires high speed because of high curing rate and crystallization rate; avoids melting and condensation of the melt during the injection process; it is important to maintain good air permeability in the mold, otherwise the entrapped air tends to cause coking at the end of the flow path.
The maximum screw speed of the screw rotation speed is 0.5m/s;
The metering stroke is 0.5~3.5D, because the melt is sensitive to overheating and excessive residual time in the barrel; the residual time should not exceed 0.5min.
Residual material amount 2~5mm, depending on metering stroke and screw diameter
Pre-drying at 400 ° C for 4 h
If the recovery rate is mixed with flame retardant, no more than 10% of the recycled material is allowed to be added, provided that it is pre-baked and has no thermal degradation; the material containing no flame retardant can be added to the 20% return material.
The shrinkage rate is largely determined by the mold. The higher the mold temperature, the greater the shrinkage; the shrinkage rate is 1.4% to 2.0%, or the addition of 30% glass fiber makes the shrinkage rate 0.4% to 0.6%.
Gating system Glass fiber reinforced materials avoid the use of center sprues and point gates; the position of the gate should be evenly filled with the cavity; the hot runner at the gate, the temperature must be closed-loop controlled
The machine is shut down during the machine downtime, the machine is operated like an extruder until no plastic is squeezed out; after the production is interrupted, the machine is restarted and the melt is extruded until there are no bubbles.
Barrel equipment standard screw, check ring, straight-through nozzle
Nine, polyethylene terephthalate (PET)
Barrel temperature feeding zone 50~70° (70°)
Zone 1 240~260° (250°)
Zone 2 240~260° (250°)
Zone 3 250~290° (270°)
Zone 4 250~290° (270°)
Zone 5 250~290° (270°)
Nozzle 250~290° (270°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melting temperature 270~280°C
Barrel constant temperature 220 ° C
Mold temperature 120~140°C
Injection pressure thin section products can be 160Mpa (1600bar)
The holding pressure is about 50%~70% of the injection pressure to avoid shrinkage; the holding time is selected as needed; the long holding time is easy to cause internal stress, especially for the amorphous resin, which will make the product impact resistant. Sexual reduction
Back pressure 5~10Mpa (50~100bar) to avoid friction heat
The injection speed requires high speed because of high curing rate and crystallization rate; avoids melting and condensation of the melt during the injection process; it is important to maintain good air permeability in the mold, otherwise the entrapped air tends to cause coking at the end of the flow path.
The maximum screw speed of the screw rotation speed is 0.5m/s;
The metering stroke is 0.5~3.5D, because the melt is sensitive to overheating and excessive residual time in the barrel; the residual time should not exceed 0.5min.
Residual material amount 2~5mm, depending on metering stroke and screw diameter
Pre-drying at 400 ° C for 4 h
The recovery rate can be increased by up to 20%, provided that the regrind must be well pre-baked and not thermally degraded; no stretching, bending and impact strength are required.
The shrinkage varies greatly depending on the resin, the thickness of the section, the mold temperature and the holding pressure: shrinkage of 1.2% to 2.0%, or the addition of 30% glass fiber reinforced material, resulting in a shrinkage of 0.4%.
~0.6%
Any common gate of the gate system can be used; there is a hot runner at the gate, and the temperature must be closed-loop controlled
When the machine is shut down, the heating system is turned off, and the machine is operated like an extruder until no plastic is extruded. If other thermoplastic materials are changed at the material, it is recommended to clean with PE or PP.
Barrel equipment standard screw, check ring, straight-through nozzle
Ten, polycarbonate (PC)
Barrel temperature feeding area 70~90° (80°)
Zone 1 230~270° (250°)
Zone 2 260~310° (270°)
Zone 3 280~310° (290°)
Zone 4 290~320° (290°)
Zone 5 290~320° (290°)
Nozzle 300~320° (290°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 250~310°C
Barrel constant temperature 220 ° C
Mold temperature 80~110°C
Injection pressure requires high injection pressure due to poor fluidity of the material: 130~180Mpa (1300~1800bar)
40%~60% of the pressure of the holding pressure; the lower the holding pressure, the lower the product stress
Back pressure 10~15Mpa (100~150bar)
Injection speed depends on flow length and section thickness: thin-walled products require rapid injection; for good surface quality, multi-stage slow injection
The maximum linear speed of the screw speed is 0.6m/s; the plasticizing time corresponds to the cooling time; the screw requires a large torque
Measuring stroke 0.5~3.5D
Residual material amount 2~5mm, depending on metering stroke and screw diameter
Pre-drying at 120 ° C for 3 h; maintaining moisture below 0.02% will result in better mechanical properties
The recovery rate can be increased by up to 20%; the higher return ratio will maintain heat resistance, but the mechanical properties will be reduced.
The shrinkage rate is 0.6%~0.8%. If it is a glass reinforcement type, 0.2%~0.4%
The gate system gate diameter should be at least 60%~70% of the maximum wall thickness of the product, but the gate diameter is at least 1.2mm (the gate slope is 3~5°, or the surface quality product needs 2°); For small products with uniform wall thickness, point gates can be used.
When the machine is shut down, such as production interruption, the machine is operated like an extruder until no plastic is extruded and the temperature is as low as 200 °C: cleaning the barrel, using high-viscosity PE, pulling the screw out of the hot barrel and scraping it with a wire brush material
Barrel equipment standard screw, check ring, straight-through nozzle
11. Acrylonitrile-butadiene-styrene copolymer (ABS)
Barrel temperature feeding zone 40~60° (50°)
Zone 1 160~180° (180°)
Zone 2 180~230° (210°)
Zone 3 210~260° (240°)
Zone 4 210~260° (240°)
Zone 5 210~260° (240°)
Nozzle 210~260° (240°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 220 ° ~ 250 ° C
Barrel constant temperature 220 ° C
Mold temperature 40~80°C
Injection pressure 100~150Mpa (1000~1500bar)
The holding pressure is relatively short, and the injection pressure is 30%~60%.
Back pressure 5~15Mpa (50~150bar); if the back pressure is too low, the air entrapped in the melt will cause coking (there is grayish black in the product)
The injection speed is preferably grading injection: from slow to fast; high injection speed is required to achieve good surface gloss, minimum fusion seam and high strength of fusion joint; need to open a ventilated tunnel at the junction of the front runner
The screw speed is the maximum screw speed, and the linear speed is 0.6m/s. However, it is better to set the screw speed lower, as long as the plasticizing process can be completed before the end of the cooling time.
Measuring stroke 0.5~0.4D
Residual material amount 2~8mm, depending on metering stroke and screw diameter
Pre-bake ABS can be directly fed from the raw material bag in some cases without drying, otherwise it will be dried at 80 ° C for 3 h; wet particles will cause cracks, scratches or bubbles in the product.
The recovery rate can be added to the 30% return material; provided that the material has not been thermally degraded
Shrinkage rate is 0.4%~0.7%,
The gate system can use point gates and hot runners; the minimum wall thickness should not be less than 0.7mm, because ABS is less fluid
No other material cleaning is required during machine downtime
Barrel equipment standard screw, check ring, straight-through nozzle
12. Acrylonitrile-butadiene-styrene copolymer/polycarbonate (ABS/PC)
Barrel temperature feeding zone 50~70° (70°)
Zone 1 230~250° (250°)
Zone 2 250~260° (260°)
Zone 3 250~270° (265°)
Zone 4 250~270° (265°)
Zone 5 250~270° (265°)
Nozzle 250~270° (270°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 260 ° ~ 270 ° C
Barrel constant temperature 200 ° C
Mold temperature 70~90°C
Injection pressure 80~150Mpa (800~1500bar)
The pressure of the pressure injection pressure is 40%~50% to avoid the shrinkage of the product; in order to minimize the internal stress of the product, the pressure should be set as low as possible.
Back pressure 5~10Mpa (50~100bar); avoid friction heat
Injection speed medium injection speed to minimize frictional heat; multi-stage injection; recommended for some products from slow to fast
The maximum screw speed of the screw rotation speed is 0.4m/s;
The metering stroke (1.0~3.0D) is sensitive to overheating and excessive residence time in the barrel; the residual time should not exceed 6min, and the residence time in the hot runner should be as low as possible.
Residual material amount 2~5mm, depending on metering stroke and screw diameter
Pre-drying at 80 ° C for 4 h
The recovery rate can be added to the 20% return material; as long as the material does not undergo thermal degradation and has been pre-baked properly; it is better if the product is not required for strength.
Shrinkage is almost isotropic, 0.5% to 0.7%; for fiberglass reinforced; 0.2% to 0.4%
Any common gate of the gate system can be used; there is a hot runner at the gate, and the temperature must be closed-loop controlled
Turn off the heating during the machine shutdown period and operate the machine cleaning cartridge as if the extruder were operated
The standard screw diameter of the barrel equipment is 50mm; for the large diameter screw, the low compression and short metering section geometry; the check ring, the straight through nozzle
Thirteen, styrene-acrylonitrile copolymer (SAN)
Barrel temperature feeding zone 30~50°(50°)
Zone 1 160~180° (180°)
Zone 2 180~230° (210°)
Zone 3 210~260° (240°)
Zone 4 220~260° (240°)
Zone 5 220~260° (240°)
Nozzle 220~260° (240°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 220 ° ~ 250 ° C
Barrel constant temperature 200 ° C
Mold temperature 40~80°C
Injection pressure 100~150Mpa (1000~1500bar)
The holding pressure is relatively short, and the injection pressure is 30%~40%.
Back pressure 5~15Mpa (50~150bar); if the back pressure is too low, the air entrapped in the melt will cause coking (there is grayish black in the product)
Injection speed is fast and fast injection to obtain good surface gloss and color, minimum fusion seam and maximum fusion seam strength
The maximum screw speed of the screw speed is 0.6m/s; however, it is better to set the screw speed to a lower level, as long as the plasticizing process can be completed before the end of the cooling time; medium screw torque is required.
Measuring stroke 0.5~4.0D
Residual material amount 2~8mm, depending on metering stroke and screw diameter
Pre-bake drying at 80 ° C for 4 h; improper storage will increase water absorption; this will cause cracks, scratches or bubbles on the surface of the product during the molding process.
The recovery rate can be added to 30% of the material; the premise is that the material has not been thermally degraded; for high quality products, only authentic materials should be used.
Shrinkage rate 0.4%~0.7%
Gate system Generally, any gate system and hot runner can be used.
No need to clean with other materials during machine shutdown
Standard screw for barrel equipment; check ring, straight through nozzle
Fourteen, plexiglass (PMMA)
Barrel temperature feeding zone 60~80° (70°)
Zone 1 150~200° (190°)
Zone 2 180~220° (210°)
Zone 3 200~250° (230°)
Zone 4 200~250° (230°)
Zone 5 200~250° (230°)
Nozzle 200~250° (230°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 220 ° ~ 250 ° C
Barrel constant temperature 170 ° C
Mold temperature 40~80°C
Injection pressure requires high injection pressure due to poor sex
Holding pressure 100~170Mpa (1000~1700bar); for thick section products, it requires high holding pressure and long holding time, such as lens (40%~60% of injection pressure, 2~3min)
Back pressure requires relatively high back pressure: 10~30Mpa (100~300bar); insufficient back pressure can cause voids or gray marks in the product.
The injection speed depends on the section thickness and flow length: thick section products require very low injection speeds to achieve proper forward flow effects; multi-stage injection: slow to fast speeds are recommended for good surface quality near the gate
The screw speed is plasticized as slowly as possible to suit the cooling time; the maximum screw speed is 0.5 m/s; the screw torque is required.
Measuring stroke 0.5~3.5D
Residual material amount 2~6mm, depending on metering stroke and screw diameter
Pre-drying absolutely needs to be dried at 80 ° C for 4 h, because the water absorption rate is as high as 1%
The recovery rate allows, as long as the material has been properly dried and added to the pigment; adding the recycled material to produce the product no longer has good optical quality
Shrinkage rate 0.3%~0.7%
The gate system requires a large size gate due to poor fluidity of the resin; for the lens, the gate should be 0.5 mm smaller than the thickness of the outer profile; the gate diameter should be at least as large as the thickness of the section of the product; The surface quality should avoid sharp edges between the gate and the product; for effective long-distance pressure transfer, the gate (cross-section) should be short and round or square; do not use wide and/or thin gates. section
No need to clean during machine downtime
Standard screw for barrel equipment; special geometry for optical parts; check ring, straight-through nozzle
Fifteen, polyoxymethylene (POM)
Barrel temperature feeding zone 40~50°(50°)
Zone 1 160~180° (180°)
Zone 2 180~205° (190°)
Zone 3 185~205° (200°)
Zone 4 195~215° (205°)
Zone 5 195~215° (205°)
Nozzle 200~250° (230°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 205 ° ~ 215 ° C
Barrel constant temperature 170 ° C
Mold temperature 40~120°C
The injection pressure is 100~150Mpa (1000~1500bar); for thick-walled products with a section thickness of 3~4mm, the injection pressure is about 100Mpa (1000bar), and the thin-walled parts can be raised to 150MPa.
The holding pressure depends on the wall thickness of the product and the temperature of the mold; the longer the holding pressure, the smaller the shrinkage of the part; the holding pressure should be 80~100Mpa, and the pressure in the mold can be 60~70Mpa; the place where precision molding is needed, keep the injection pressure and protect It is advantageous to press the same level (no pressure drop). Under the same cycle time conditions, the dwell time is extended; the forming weight is no longer increased, which means that the dwell time is optimal; usually the dwell time is always 30% of the cycle time; the molding weight is only 95% of the standard weight, because the shrinkage is 2.3%; when the molding weight reaches 100%, the shrinkage is 1.85%; the balanced and low shrinkage keeps the product size stable
Back pressure 5~10Mpa;
Injection speed is medium injection speed; if the injection speed is too slow, the mold or melt temperature is too low, the surface of the product tends to appear fine
The screw speed screw speed is 0.70/s linear speed: the screw speed is set as long as the plasticizing process can be completed before the end of the cooling time; the screw torque requirement is medium.
Measuring stroke 0.5~3.5D
Residual material amount 2~6mm, depending on metering stroke and screw diameter
Pre-bake is not required; if the material is damp, dry at 100 ° C for about 4 h
The recovery rate is generally 100% recycled, and the precision molding can add up to 20%.
The shrinkage rate is about 0.2% (1.8~3.0%); the shrinkage stops after 24h
The gate system with a small wall thickness can be used as a point gate; the cross section of the gate should be 50%~60% of the thickest section of the product; it is better to inject against some obstacles in the cavity (neutron, compartment); Forming with hot runner mold is also a process
When the machine is shut down, the heating system is turned off 5~10 minutes before the end of production, the back pressure is zero, and the barrel is empty like an extruder; when other resin is replaced, PA or PC is added, and the barrel is cleaned with PE.
Standard screw for barrel equipment; check ring, straight through nozzle
Sixteen, acetate fiber (CA)
Barrel temperature feeding zone 30~40° (40°)
Zone 1 140~160° (150°)
Zone 2 160~185° (170°)
Zone 3 170~200° (180°)
Zone 4 170~200° (180°)
Zone 5 170~200° (180°)
Nozzle 170~200° (180°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
The melt temperature is 200°~210°C; the change of the melt color indicates that the melt temperature is too high; if the melt temperature is too low, the surface gloss and transparency will be affected.
Barrel constant temperature 160 ° C
Mold temperature 40~80°C
Injection pressure 80~120Mpa (800~1200bar)
40%~100% of the pressure of the pressure holding pressure; the pressure should not be too high to avoid internal stress; allow thicker wall products to hold longer pressure
Back pressure 5~10Mpa;
Injection speed for rapid injection of thin-walled products; slow speed for thick-walled products
The screw speed is medium speed, and the screw speed is reduced to 0.6m/s.
Measuring stroke 1.5~3.5D
Residual material amount is 3~8mm, depending on metering stroke and screw diameter
Pre-drying at 70 ° C for about 3 hours
The recovery rate can be increased by 20%, provided that no thermal degradation occurs and pre-drying
The shrinkage rate is 0.4~0.7% (0.4% in the flow direction, 0.6%~0.7% in the cross section of the flow)
Gate system point / latent gate; avoid the jet when using the auxiliary neutron with spring added, otherwise surface defects will occur near the gate
The heating system is turned off during the machine downtime, plasticized several times without back pressure and the barrel is emptied like an extruder
Standard screw for barrel equipment, in some cases special geometry required; check ring, straight through nozzle
Seventeen, polyether ether (PPO)
Barrel temperature feeding zone 40~60° (50°)
Zone 1 24~280° (250°)
Zone 2 280~300° (280°)
Zone 3 280~300° (280°)
Zone 4 280~300° (280°)
Zone 5 280~300° (280°)
Nozzle 280~300° (280°)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of the module flow length to the wall thickness is 50:1 to 100:1.
Melt temperature 270 ° ~ 290 ° C
Barrel constant temperature 200 ° C
Mold temperature 80~120°C
Injection pressure 100~140Mpa (1000~1400bar)
40%~60% of the pressure of the pressure holding injection
Back pressure 3~10Mpa;
Products with long flow paths at injection speed require rapid injection; but in this case, ensure that the mold is sufficiently ventilated
The screw speed is medium speed, and the screw speed is reduced to 0.6m/s.
Measuring stroke 0.5~3.5D
Residual material amount is 3~6mm, depending on metering stroke and screw diameter
Pre-drying at 110 ° C for 2 h
Recycling materials can be recycled, as long as the return material does not undergo thermal degradation
Shrinkage rate 0.8~1.5%
The gate system uses point or latent gates for small products, otherwise it uses sprue or wafer gates; hot runners can be used
When the machine is shut down, the heating system is turned off. Under the condition of low screw back pressure, the metering cycle is operated several times, and the barrel is emptied like the extruder.
Standard screw for barrel equipment; check ring, straight through nozzle
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