ABS (acrylonitrile-butadiene-styrene copolymer) ABS 1. Select appropriate sprue and gate according to fluidity. 2. Select appropriate fusion state for gate location. 3. Due to high pressure forming, retraction inclination must be above 2°. 4. Shrinkage in plastic injection molding must be around 0.5%. 5. Commonly used for gold-plated products, following matters are as follows:

1. 36 common plastic raw materials molding temperature
 ABS (acrylonitrile-butadiene-styrene copolymer)
1. Select appropriate sprue and gate according to fluidity.
2. Select appropriate fusion state for gate location.
3. Due to high pressure forming, retraction inclination must be above 2°.
4. Shrinkage in plastic injection molding must be around 0.5%.
5. Commonly used for gold-plated products, following matters are as follows:
(1) Barrel temperature injection molding should be high, about 220℃ ~ 250℃;
(2) Injection temperature should be slow (using a secondary pressurization method), and
injection pressure should be low;
(3) Release agent cannot be used;
(4) There shall be no flow marks of shrinkage depressions and weld lines;
(5) There must be no marks on the surface of finished product.
6. Heating temperature 180~290 ℃ , molding temperature 50~80 ℃ , barrel temperature
injection molding 200~230 ℃, discharge temperature 200~240℃ , injection molding pressure
700~1500kg/cm2, minimum operating temperature 260℃.
7. Use air thermal dryer, drying temperature is 80~100 ℃ , 2~4 hours (0.3% or less), the first
section of material temperature is 220~240 ℃ ; second section is 210~240 ℃ ; third section is
180~230℃; fourth section is 150~180℃; mold surface temperature is 50~90℃, and injection
molding pressure is 500~2100kg/cm2.
8. Temperature setting: nozzle 203~295℃, front section 220~295℃, middle section 210~290℃,
rear section 180~210 ℃ ; screw speed 70~150rpm, molding temperature 10~80 ℃ , pressure
holding 30~60 %, back pressure 100~250kg/cm2.
9. Density 1.04~1.06g/cc, deformation temperature 82~122 ℃ , shrinkage in plastic injection

2. molding 0.4~0.8%, specific gravity 1.0~1.2, linear expansion coefficient 0.00006~0.00013/ ℃ ,
shrinkage in plastic injection molding 0.3~0.8%, heat distortion temperature 66~107 ℃
(88~113℃).
 PA (polyamide (nylon))
1. Plastic injection molding temperature and drying temperature must be high; injection
molding pressure and hold pressure should not be too high or too long. High-speed injection of
male mold should have an exhaust passage to avoid charring of material; back pressure is
50~150kg/cm2.
2. Plastics must not be placed in melt cylinder when dryness is not reached. Because of strong
moisture, it is easy to get stuck in rod groove of feeding section, which is difficult to feed.
3. When forming, it is the easiest to cool at nozzle. If injection molding pressure is increased
during cooling, check valve may be broken, so temperature control at nozzle must be appropriate.
In order to prevent plastic from spilling into mold, it is advisable to use a controlled nozzle.
4. When using other plastics for injection, it should be noted that original nylon heating
temperature is above 270℃, and general material heating temperature is only operating at about
200℃. Therefore, it is necessary to heat melted rubber cylinder to nylon heating temperature
before operating. Otherwise, it is easy to break check valve and dispensing head of screw.
5. Pay attention to molding method to produce good results.
6. To prevent formation of waste edges, precision molds must be used.
7. Use molds for industrial products, and pay attention to crystallization of forming materials
when temperature rises.
8. Plastic molded products must be designed to prevent dents and to consider dimensional
stability.
9. Shrinkage in plastic injection molding is about 1.5 to 2.5%.
10. Nylon 6 (PA6) heating temperature 220~300 ℃ , molding temperature 100~160 ℃ , barrel

3. temperature injection molding 200~260 ℃ , discharge temperature 220~300 ℃ , injection
molding pressure 700~2000kg/cm2, minimum operating temperature 225 ℃ , plastic material
melting temperature 215℃, molding temperature 10 ~ 300℃, drying temperature is 75 ~ 100℃,
2 ~ 6 hours, using dehumidification dryer, injection molding pressure 750 ~ 2000kg / cm2, the
first section of barrel temperature injection molding is 230℃; second section is 230℃; third
section is 220℃; fourth section is 210℃; mold surface temperature is 25 ~ 70℃. Coefficient of
linear expansion is 0.000083/ ℃ , shrinkage in plastic injection molding is 0.6~2.1%, specific
gravity is 1.1~1.4, heat distortion temperature is 67~70℃ (149~185℃).
11. Nylon 66 (PA66) heating temperature 250~380℃, molding temperature 30~100℃, barrel
temperature injection molding 240~300 ℃ , discharge temperature 250~310 ℃ , injection
molding pressure 600~2100kg/cm2, minimum operating temperature 260 ℃ , plastic material
melting temperature 215℃, molding temperature 260 ~ 320℃, drying temperature 80 ~ 90℃, 3
~ 6 hours, using dehumidifying dryer, coefficient of linear expansion 0.00008 ~ 0.00013 / ℃ ,
shrinkage in plastic injection molding of 1.3 ~ 2.4%, specific gravity is 1.1~1.4, heat distortion
temperature is 66~86℃.
12. Temperature setting: nozzle 235~265℃, front section 235~245℃, middle section 210~240℃,
rear section 195~230℃; screw speed 100~105rpm, molding temperature 35~40℃, back pressure
5-10kg .
13. Density is 0.94~1.14g/cc, deformation temperature is 35~121 ℃ , shrinkage in plastic
injection molding is 0.7~2.5%.
 POM (polyoxymethylene)
1. It is necessary to pay attention to temperature management during molding. POM material
should not be retained in melt cylinder for a long time, otherwise it is easy to overheat and
yellow.
2. Gas after melting is very thick, contact points of nozzles and flanges are most susceptible to

4. corrosion, and a good material should be used.
3. Heating temperature 190~220℃, mold temperature 80~120℃, barrel temperature injection
molding 170~225 ℃ , discharge temperature 190~210 ℃ , injection molding pressure
800~1500kg/cm2, pressure control depending on the wall of plastic part, minimum operating
temperature is 180℃.
4. Use air thermal dryer, drying temperature 100~120℃, 1~4 hours, the first section of material
temperature is 190~215 ℃ ; second section is 195~215 ℃ ; third section is 180~205 ℃; fourth
section is 150~180℃; mold surface temperature is 60~120℃.
5. Temperature setting: nozzle 185~215℃, front section 190~200℃, middle section 175~190℃,
rear section 170~190℃; screw speed 80~200rpm, mold temperature 30~80℃, injection forming
temperature 195~ 250℃, 700 ~ 1500 kg / cm2, back pressure 100 ~ 200kg / cm2.
6. Density 1.30~1.45g/cc, deformation temperature 70~125 ℃ , shrinkage in plastic injection
molding 0.8~2.0%, specific gravity 1.4~1.6, linear expansion coefficient 0.000081/℃.
 PC (polycarbonate resin (polyurethane, bulletproof rubber))
1. When injection molding pressure is too high, barrel temperature injection molding is too high
or residence time is long, it is easy to cause thermal decomposition, discoloration and lower
physical properties. It should be noted that mold temperature is subject to 85℃~120℃.
2. It is especially difficult to form a thick finished product. Because finished product is prone to
residual stress, it will cause rupture in the future. Therefore, it is advisable to use powdered
silicon likon as a release agent, and do not use a liquid release agent.
3. Forming must be high temperature and high pressure, and a screw forming shuttle must be
used.
4. Material is pre-dried thoroughly before use.
5. Gate, runner design should have a small flow impedance.
6. Design of plastic molded products should have a close-knit thickness to avoid inlay of metal
parts. Furthermore, retraction tilt must be above 2°.
7. Shrinkage in plastic injection molding is 0.4~0.7%, and specific gravity is 1.2~1.5.
8. Heating temperature 260~320℃, mold temperature 80~120℃, barrel temperature injection
molding 260~310 ℃ , discharge temperature 280~320 ℃ , injection molding pressure
800~1500kg/cm2, minimum operating temperature 260℃.
9. Using a dehumidifying dryer, drying temperature is 105~120℃ (0.02~0.03% or less), 2~4 hours,

5. the first section of barrel temperature injection molding is 260~270 ℃ ; second section is
260~270℃; third section is 240~250℃; fourth section is 220~230℃; mold surface temperature is
40~60℃.
10. Temperature setting: nozzle 275~305℃, front section 270~275℃, middle section 265~275℃,
rear section 250~270 ℃ ; screw speed 50~115rpm, mold temperature 60~120 ℃ , injection
molding pressure 700~2100kg /cm2, back pressure 5-15kg.
11. Density 1.20g / cc, deformation temperature 120 ~ 146 ℃ , coefficient of linear expansion
0.000066 /℃, heat distortion temperature 129 ~ 135℃ (141℃).
 PBT (saturated polyester (thermoplastic polyester))
1. Temperature of melt cylinder should be controlled at 230~270℃, molding temperature should
be set at 40℃~90℃.
2. When you want a shiny surface, it is advisable to heat up. If necessary, perform sufficient
preliminary drying is required. Required injection molding pressure is about 500~1300kg/m2.
3. Temperature setting: nozzle 250℃, front section 245℃, middle section 235℃, rear section
230 ℃ ; screw speed 80 rpm, mold temperature 40 ~ 120 ℃ , back pressure 10 kg, barrel
temperature injection molding 230 ~ 270 ℃ , injection molding pressure 300 ~1000kg/cm2,
drying temperature 100~140℃, 2~8 hours.
4. Density 1.29~1.50g/cc, deformation temperature 50~110 ℃ , shrinkage in plastic injection
molding 1.3~2.4%, specific gravity 1.3~1.6.
 PMMA (polymethyl methacrylate (acrylic))

6. 1. This material has strong toughness and poor flow, should be formed at low temperature.
Speed should be slow so that temperature does not rise inside barrel.
2. When designing mold, it is necessary to increase sprue and nozzle hole.
3. Acrylic molding is a technical processing and forming. When operating, it is necessary to clean
room to isolate dust, funnel should be clean, mold should be light, and white gloves should be
kept clean.
4. General type: barrel temperature injection molding 180~240℃, injection molding pressure
750~2400kg/cm2, molding temperature 40~70℃, drying temperature 70~75℃ (0.1~0.2%), 4
hours, shrinkage 0.4 ~0.8.
5. Heat-resistant type: barrel temperature injection molding 220~260 ℃ , injection molding
pressure 750~2400kg/cm2, mold temperature 40~70 ℃ , drying temperature 70~75 ℃
(0.1~0.2%), 4 hours, shrinkage 1.1~1.2.
6. Drying temperature is 80℃, 3~4 hours, the first section of barrel temperature is 200~220℃;
second section is 190~220℃; third section is 170~200℃; fourth section is 150 ~180℃; mold
surface temperature 20 ~ 90℃.
7. Temperature setting: nozzle 185~215℃, front section 190~200℃, middle section 175~190℃,
rear section 170~190℃; screw speed 80~200rpm, molding temperature 30~80℃, high injection
molding pressure is used, pressure is maintained for 2~3 minutes and back pressure is
150~400kg/cm2.
8. Density 1.14~1.20g/cc, deformation temperature 76~116 ℃ , shrinkage in plastic injection
molding 0.2~0.8%.
9. Coefficient of linear expansion is 0.00005~0.00009/ ℃ , and heat distortion temperature is
68~99℃ (74~107℃).
 PP (polypropylene)

7. 1. PP material will start to deteriorate from around 280℃, so heating temperature should be
below 270℃, and its molecular alignment is very strong. When molding at low temperature, it is
easy to warp and twist due to molecular alignment.
2. A high pressure molding machine must be used for high pressure forming.
3. Retraction tilt may be magnified. Flow paths and gates must be designed for fluidity. Pay
attention to controlling material temperature and modulus.
4. Shrinkage in plastic injection molding is about 0.35%, heating temperature is 180~300 ℃ ,
molding temperature is 20~80℃, barrel temperature injection molding is 220~270℃, discharge
temperature is 210~280 ℃ , injection molding pressure is 400~1000kg/cm2, operating
temperature is 200℃.
5. Gate design must pay attention to adhesion of plastic molded products. Plastic molded
products must be designed to prevent dents and deformation. Forming shrinkage is about 0.8 to
1.5%.
6. Use air thermal dryer, drying temperature is 60~90 ℃ , 1 hour, the first section of barrel
temperature injection molding is 240~250 ℃ ; second section is 190~250 ℃ ; third section is
170~230℃; fourth section is 150~210℃; surface temperature of mold is 20~60℃.
7. Temperature setting: nozzle 200~220℃, front section 190~215℃, middle section 190~210℃,
rear section 185~200℃; screw speed 120~max rpm, molding temperature 20~70℃, injection

8. molding pressure 700~ 1800℃, hold pressure is extremely long 30 ~ 70%, back pressure 120 ~
200kg / cm2.
8. Density 0.90~0.91g/cc, specific gravity 0.9~0.92, linear expansion coefficient
0.000058~0.0001/ ℃ , shrinkage in plastic injection molding 1.0~2.5%, heat distortion
temperature 57~63℃ (96~110℃).
 PPS (polyphenylene sulfide)
1. Density 1.34~1.40g/cc, deformation temperature 110~265℃, molding shrinkage 0.4~1.4%.
2. Barrel temperature injection molding is 290~360 ℃ , injection molding pressure is
500~1400kg/cm2, mold temperature is 120~150℃, injection molding temperature is 300~370℃.
3. Burning point 288℃, glass transfer point 90℃, fast curing speed, resin temperature 320℃,
molding temperature 150 ℃ , injection molding pressure 600 kg / cm 2, fast injection speed,
short forming time, pre-drying 140℃, 3 hours, shrinkage in plastic injection molding is 1.6%,
glass fiber strengthened 100.
4. Use air thermal dryer, drying temperature 130~150℃, 2~3 hours.
5. Use dehumidifying dryer, drying temperature 120~140℃, 2~4 hours.
 PS (polystyrene)

9. 1. It is easier to form.
2. When ejecting in mold, attention should be paid to splitting and selecting a suitable switch
mode mechanism.
3. If plastic molded products has cracks, pay attention to design of plastic molded products. In
special cases, use a retraction tilt of 1° or more, and note that mold must not have a depressed
portion.
4. Shrinkage in plastic injection molding is about 0.45%, general heating temperature is
160~310 ℃ , mold temperature is 40~70 ℃ , impact resistant heating temperature is 180 ℃ ,
molding temperature is 40-70℃.
5. Use air thermal dryer, drying temperature is 60~80℃, 1~2 hours, barrel temperature injection
molding is 180~260℃, first section is 190~215220~240℃; second section is 210~240℃; third
section is 180~230 ℃; fourth section is 150~180 ℃ ; mold surface temperature is 10~70 ℃ , 2
hours.
6. Temperature setting: nozzle 190~225℃, front section 180~225℃, middle section 160~220℃,
rear section 150~200℃; screw speed 70~160rpm, mold temperature 20~80 ℃, back pressure
10~20kg .
7. Density 1.04~1.06g/cc, deformation temperature 65~106 ℃ , molding shrinkage 0.4~0.8%,
specific gravity 1.0~1.1.
8. Flow length 200~500L/t, linear expansion coefficient 0.00005~0.000083/ ℃ , glass transition
temperature 85~110℃, load bending temperature 68~105℃ (50~95℃), conductivity coefficient
0.0003/℃, density 1.03~1.05g/cm3, tensile strength 350~550kgf/cm2, elongation rate 1.2~3.6%,
elastic coefficient 22000~32000kgf/cm2, 2.1~3.2kgf.cm/cm, impact strength 1.9 ~2.4kgf.cm/cm,
rockwell hardness M60~84, transparent, water absorption 0~0.03%.
 PE (polyethylene)

10. 1. High-density PE material has obvious crystallization temperature, and it is better to increase
injection speed.
2. For thick meat products, increasing speed of injection is particularly important: it can improve
surface gloss of product, prevent warpage, and reduce shrinkage in plastic injection molding.
3. Screw design and anti-reverse equipment need to be precise. If there is loss and damage, it will
gradually slow down when feeding. (Amount of injection into mold is reduced due to reverse flow
of plastic, and molten material is poured back into metering section, so that new material in feed
section is retained, causing metabolism to fail, thereby forming molded product it not solid, high
shrinkage, and high defect rate. )
4. Mold design (gate, runner) has a fast material filling speed.
5. Use a cooling method with uniform cooling rate.
6. It is better to use screw type molding machine and has good fluidity; it does not need injection
molding pressure, and pressure should be 30~60% longer.
7. Molding shrinkage ratio was 2.5%, and right angle direction was 2.0%.
8. Plastic molded products should be designed to prevent warpage and deformation.
9. Under low pressure, heating temperature is 140~300 ℃, molding temperature is 30~65 ℃;
under high pressure, heating temperature is 150~300℃, mold temperature is 50~70℃.
10. High-density PE material barrel temperature injection molding is 210 ℃ , rear one-stage
discharge temperature power supply can be turned off, injection molding pressure is
500~1500kg/cm2, minimum operating temperature is 180℃.
11. Drying temperature is 85℃, 1 hour, the first section of barrel temperature injection molding
is 220~240 ℃ ; second section is 200~220 ℃ ; third section is 180~190 ℃ ; fourth section is
160~170℃; mold surface temperature 30~70℃.
12. Temperature setting: nozzle 210~265℃, front section 200~255℃, middle section 200~250℃,
rear section 190~240℃; screw speed 110~140rpm, mold temperature 45~50℃, back pressure
150~250kg /cm2.

11. 13. Density is 0.91~0.97g/cc, deformation temperature is 32~95℃, shrinkage in plastic injection
molding is 0.5~2.5%.
 PEEK (poly)
1. Density 1.30~1.45g/cc, deformation temperature 151~300 ℃ , shrinkage in plastic injection
molding 1.0%.
2. Burning point 334℃, glass transfer point 134℃, fast curing speed, plastic material melting
temperature 400℃, mold temperature 180℃, injection molding pressure 1000 kg / cm 2, fast
injection speed, long forming time, preliminary drying 150℃, more 3 hours, glass fiber reinforced
30, fluidity 55.
 PES/PESF (polyether)

12. 1. Density 1.24~1.37g/cc, deformation temperature 174~214 ℃ , shrinkage in plastic injection
molding 0.5~1.0%.
2. Glass transfer point 225℃, plastic material melting temperature 370℃, mold temperature
160 ℃ , injection molding pressure 900 kg / cm 2, normal injection speed common, normal
forming time, pre-drying 150℃, 3 hours, glass fiber reinforced 55, fluidity 70 .
 PET (polyethylene terephthalate)
1. Temperature setting: nozzle 280~295℃, front section 270~275℃, middle section 265~275℃,
rear section 250~270 ℃ ; screw speed 50~100rpm, molding temperature 30~85 ℃ , mold
temperature of amorphous type is below 70℃, back pressure is 5-15 kg.
2. Use dehumidifying dryer, barrel temperature 240~280 ℃ , injection molding pressure
500~1400℃, injection molding temperature 260~280℃, drying temperature 120~140℃, 2~5

13. hours.
 PI (polyimide)
1. Density 1.16~1.64g/cc, deformation temperature 278~380℃.
2. Burning point 388℃, glass transfer point 250℃, fast curing speed, plastic material melting
temperature 410℃, mold temperature 200℃, injection molding pressure 800 kg / cm 2, normal
injection speed, normal forming time, preliminary drying 200 ℃ , 6 hours, shrinkage in plastic
injection molding is 1.6%, glass fiber is strengthened 40, fluidity is 75.
 PTFE (polytetrafluoroethylene)
1. Heating temperature is 260~340℃, mold temperature is 100~160℃.
2. Glass transition temperature is 19 ℃ , copper foil tear strength is 7.1 lb / in, sheet Z-axis
thermal expansion coefficient is 73 ppm /℃, dimensional stability is 0.8%, manageability is 25%.
3. Tg is very low and too soft at room temperature.
 PU or PUR (polyurethane)
1. Using a dehumidifying dryer, drying temperature of 90℃, 1 to 4 hours, molding temperature
80 ~ 100℃.
2. Barrel temperature injection molding is 180~240℃, density is 1.14g/cm2, shrinkage in plastic
injection molding is 0.6~0.8%, water absorption rate is 0.02%, barrel selection is small~med, melt
pressure gauge is 60~80kg/cm2, compression ratio is 2.2~ 2.5:1, L/D ratio is 18~20.
 PSF (polysulfone)

14. 1. Use dehumidifying dryer, heating temperature 340~400℃, molding temperature 160~200℃,
drying temperature 80~160℃, drying time 3-4 hours.
2. Density is 1.24~1.30g/cc, deformation temperature is 164~190 ℃ , shrinkage in plastic
injection molding is 0.15~0.9%.
3. Glass transfer point 189℃, fast curing speed, plastic material melting temperature 350℃,
mold temperature 130 ℃, injection molding pressure 900 kg / cm 2, normal injection speed,
normal forming time, glass fiber reinforced 30, fluidity 45.
4. Barrel temperature injection molding 330~360℃, nozzle 330℃, first stage 330℃, second
stage 320 ℃ , third stage 290 ℃ , mold temperature 95~100 ℃ , injection molding pressure
700~1000kg/cm2, shrinkage in plastic injection molding is 0.7%.
 AS (SAN) acrylonitrile-styrene copolymer
1. If plastic molded products has cracks, pay attention to design of plastic molded products. In
special cases, use a retraction tilt of 1° or more, and note that mold must not have a depressed
portion.
2. Shrinkage in plastic injection molding is about 0.45%, heating temperature is 170 to 310℃, air
thermal dryer is used, drying time is 2 to 3 hours (0.1% or less), drying temperature is 80 to
100℃, barrel temperature is 180 to 290℃.
3. Temperature setting: nozzle 205~240℃, front section 190~235℃, middle section 180~230℃,
rear section 180~210℃; screw speed 70~150rpm, mold temperature 35~80℃, injection molding
pressure 700~2300kg /cm2, holding pressure 30~60%, back pressure 100~200kg/cm2.
4. Linear expansion coefficient is 0.00006~0.00008/℃, shrinkage in plastic injection molding is
0.2~0.7%, heat distortion temperature is 91~93 ℃ (88~99 ℃ ), glass transition temperature is
125 ℃ , and conductivity is 0.0003cal.cm.s.sm/ ℃ , density 1.06~1.08g/cm3, tensile strength
650~800kgf/cm2, elongation rate 2~3%, elastic coefficient 32000~37000kgf/cm2,
2.1~3.2kgf.cm/cm, Rockwell hardness M80, transparent, water absorption is 0.2 to 0.3%.
 CA (cellulose acetate)

15. 1. Material must be pre-dried, drying temperature 75~80 ℃ , drying time 2~6 hours, specific
gravity 1.29.
2. Shrinkage in plastic injection molding is about 0.5%.
3. Heating temperature is 170~265℃, molding temperature is 20~80℃.
 CAB (cellulose acetate butyrate)
1. Heating temperature is 170~265℃, molding temperature is 20~80℃.
2. Drying temperature is 75~80℃, 2~6 hours.
 CP (cellulose propionate)
1. Heating temperature is 170~265℃, molding temperature is 20~80℃.
 EVA (ethylene-vinyl acetate copolymer (rubber))
1. Temperature setting: 185℃ nozzle, front section 166℃, middle section 160℃, rear section
150℃; maximum screw speed, mold temperature 35~45℃, back pressure 10kg.
2. Barrel temperature injection molding 150~180℃, nozzle 150℃, first section 150℃, second
section 140℃, third section 120℃, molding temperature 30~40℃, injection molding pressure
600~800kg/cm2, shrinkage in plastic injection molding is 0.7~2%, drying temperature is 40~50℃,
drying time is 2~4 hours.
 PET (polyethylene terephthalate)
1.UL long-term heat resistance of 140℃, heat distortion temperature of 225℃.
2. Crystallization rate is slow, drying and processing conditions are demanding.
3. Drying: 3 hours at 140℃ or 5 to 8 hours at 120℃.
4. Injection temperature: 235℃ ~ 250℃
5. Molding temperature: 40℃ ~ 80℃.
 HDPE (high density polyethylene)

16. 1. Temperature setting: nozzle 210℃, front section 200℃, middle section 200℃, rear section
195℃; screw speed 140 rpm, back pressure 15 kg.
2. Linear expansion coefficient is 0.00010~0.00013/ ℃, molding shrinkage is 1.2~5.0%, specific
gravity is 0.93~0.97, heat distortion temperature is 43~49℃ (60~82℃).
3. Barrel temperature injection molding 160~310℃, nozzle 190℃, first section 190℃, second
section 180 ℃ , third section 160 ℃ , mold temperature 10~70 ℃ , injection molding pressure
300~1400kg/cm2, shrinkage in plastic injection molding is 1.5~5%.
 HIPS (high impact polystyrene (non-breaking rubber, high impact
hard rubber, impact resistant polystyrene))
1. Temperature setting: nozzle 220~240℃, front section 210~230℃, middle section 200~230℃,
rear section 190~215℃; screw speed 135~215rpm, molding temperature 25℃, back pressure
5-10kg, specific gravity 1.05 g/cc.
2. Coefficient of linear expansion is 0.000034~0.00021/℃, shrinkage in plastic injection molding
is 0.2~0.6%, heat distortion temperature is 96℃.
 LCPI type (liquid crystal polymer type I)
1. Density 1.35~1.45g/cc, deformation temperature 198~310℃, molding shrinkage 0.1~1.4%.
2. Fast curing speed, resin temperature 390 ℃ , mold temperature 120 ℃ , injection molding
pressure 400 kg / cm 2, fast injection speed, short forming time, pre-drying 170℃, 3 hours, glass
fiber reinforced 85.
 LCPII type (liquid crystal polymer type II)

17. 1. Density 1.35~1.45g/cc, deformation temperature 198~310 ℃ , shrinkage in plastic injection
molding 0.1~1.0%.
2. Fast curing speed, resin temperature of 300℃, mold temperature of 100℃, injection molding
pressure of 300 kg / cm 2 , high injection speed, short forming time, preliminary drying of 150℃,
more than 4 hours, glass fiber reinforced 170, fluidity 210.
 LCPIII type (liquid crystal polymer type III)
1. Density 1.35~1.45g/cc, deformation temperature 198~310 ℃ , shrinkage in plastic injection
molding 0.1~1.0%.
2. Fast curing speed, plastic material melting temperature 260 ℃ , mold temperature 100 ℃ ,
injection pressure 300 kg / cm 2, fast injection speed, short forming time, preliminary drying
140℃, 3 hours required, glass fiber reinforced 230.
 LDPE (low density polyethylene (soft rubber, flower material,
cylinder, blowing material))
1. Temperature setting: nozzle 140~190℃, front section 140~200℃, middle section 135~195℃,
rear section 130~180 ℃ ; screw speed 210~220rpm, molding temperature 10~70 ℃ , barrel
temperature 150~ 310℃, back pressure 5-10 kg, mold temperature 30 ~ 50℃, injection molding
pressure 360 ~ 500kg / cm2.
2. Coefficient of linear expansion is 0.00010~0.00020/℃, shrinkage in plastic injection molding is
1.5~5.0%, specific gravity is 0.91~0.93, heat distortion temperature is 38~49℃.
 PAR (polyaryl ester)
1. Density 1.17~1.31g/cc, deformation temperature 95~175 ℃ , shrinkage in plastic injection
molding 0.8~1.0%.
2. Glass transfer point 190℃, fast curing speed, plastic material melting temperature 370℃,

18. molding temperature 130℃, injection molding pressure 1000 kg / cm 2, fast injection speed,
normal forming time, pre-drying 140℃, 6 hours, glass fiber reinforced 35 , liquidity 50.
 PCTFE (polychlorotrifluoroethylene)
1. Design suitable gates and runners for flow.
2. A high pressure injection molding machine must be used.
3. Use molding conditions that prevent discoloration.
4. Surface treatment is carried out with anti-rust molds and materials.
5. Shrinkage in plastic injection molding is about 0.5%.
 PVAC (polyvinyl acetate)
1. Heating temperature is 120~200℃, molding temperature is 20~55℃.
 PVC (polyvinyl chloride (hard))
1. Temperature inside barrel should be taken at 170-l90 ℃ , should be avoided at a high
temperature above 200℃, mold temperature should be 50-60℃.
2. Residence time of plastic should be short. The slowest feeding method is used to prevent
temperature from rising in tube, and gas can be discharged to mold body by slow injection
method. Venting hole of mold should be large, screw should be plated, anti-reverse device should
not be used, nozzle hole should be enlarged, each time it needs to be shot to the end, so that no
stagnation material is contained in the tube. When operation is stopped, temperature must be
gradually lowered, internal stagnant material is completely ejected until defective product is
operated.
3. Control of material temperature is important, and a screw type molding machine is preferred.

19. 4. Gate, runner design should have a small flow impedance.
5. Mold must be treated with a corrosion resistant surface.
6. Heating temperature 149~213℃, mold temperature 50~70℃, barrel temperature injection
molding 165~185 ℃ , discharge temperature 175~195 ℃ , injection molding pressure
1000~2800kg/cm2, minimum operating temperature 165℃.
7. Using air thermal dryer, barrel temperature injection molding is 150~190℃, 1~4 hours, drying
temperature is 80~100℃, first section is 180~200℃; second section is 180~200℃, third section
is 160~180℃; fourth section is 140~160℃; mold surface temperature is 20~600℃.
8. Temperature setting: 185℃ nozzle, front section 180℃, middle section 175℃, rear section
165℃; screw speed 60 rpm; molding temperature 25 ~ 70℃.
9. Density 1.1~1.6g/cc, deformation temperature 55~100 ℃ , shrinkage in plastic injection
molding 0.1~0.5, 1~5%, linear expansion coefficient 0.00005~0.000185/ ℃ , molding shrinkage
0.1~0.5%, heat distortion temperature 57 ~74℃ (82℃).
 PVDC (polyethylene formaldehyde)
1. Heating temperature 150~200℃, molding temperature 50~70℃.
 SAN (styrene, acrylonitrile copolymer (AB glue, SAN material,
transparent strong glue))
1. Heating temperature is 170~290℃, mold temperature is 40~80℃.
 TPU (TPU resin)
1. It must be fully dried before processing, moisture is preferably below 0.03.

20. 2. Processing of recycled materials is based on principle of not exceeding 25% of total.
3. BS/PVC can be added during processing to change fluidity or physical properties of TPU, but
not more than 15% of total.
4. Pp/LDPE can be used to clean barrel during color change processing.
5. Shrinkage rate is between 0.3-0.8%. Increasing mold gate diameter, increasing holding time
and injection molding pressure, and lowering mold temperature can reduce shrinkage of plastic
molded products.