Molding conditions for injection molding materials

Material name molding conditions ABS
1. Select the appropriate sprue and gate according to the flowability.
2. Select the appropriate fusion state for the gate position.
3. Due to high pressure molding, the retraction tilt must be above 2 degree . 4.
4. The shrinkage rate must be about 0.5 percent . 5.
5. Commonly used for gold plated products, the precautions are as follows: (1) The material tube temperature should be high, about 220 degree 250 degree (2) The injection temperature should be slow (using the second pressurization method) and the injection pressure should be low; (3) No mold release agent should be used; (4) There should be no shrinkage sink and no flow marks of fusion line; (5) There should be no trauma on the surface of the finished product.
6. Heating temperature 180290 degree , mold temperature 5080 degree , material tube temperature 200230 degree , ejecting material temperature 200240 degree , injection pressure 7001500kg/cm², minimum operation temperature 260 degree .
7. Using hot air dryer, drying temperature 80100 degree , time required 24 hours (less than 0.3 percent ), material tube temperature 220240 degree for the first section; 210240 degree for the second section; 180230 degree for the third section; 150180 degree for the fourth section; mold surface temperature 5090 degree , injection pressure 5002100kg/cm².
8. Temperature setting: injection nozzle 203295 degree , front section 220295 degree , middle section 210290 degree , back section 180210 degree ; screw speed 70150rpm, mold temperature 1080 degree , holding pressure 3060 percent , back pressure 100250kg/cm².
9. density 1.041.06g/cc, deformation temperature 82122 degree , molding shrinkage 0.40.8 percent , specific gravity 1.01.2, linear expansion coefficient 0.000060.00013/ degree , molding shrinkage 0.30.8 percent , heat deformation temperature 66107 degree (88113 degree ).

AS(SAN)
 1. If there is a risk of cracking in the molded product, pay attention to the design of the molded product. In special cases, use a retraction tilt of more than 1 degree , and pay attention to the mold must not have a low sink part.
2. Forming shrinkage rate is about 0.45 percent , heating temperature 170310 degree , using hot air dryer, drying time 23 hours (less than 0.1 percent ), drying temperature 80100 degree , material tube temperature 180290 degree , 3.
3. temperature setting: injection nozzle 205240 degree , front section 190235 degree , middle section 180230 degree , back section 180210 degree ; screw speed 70150rpm, mold temperature 3580 degree , injection pressure 7002300kg/cm², holding pressure 3060 percent , back pressure 100200kg/cm².
4. linear expansion coefficient 0.0{{10}}0060.00008/ degree , molding shrinkage 0.20.7 percent , heat deflection temperature 9193 degree (8899 degree ), glass transfer temperature 125 degree , conduction coefficient 0.0003cal.cm.s.sm/ degree , density 1.061.08g/cm³, tensile strength 650800kgf/cm², Elongation 23 percent , Elasticity 3200037000 kgf/cm², 2.13.2kgf.cm/cm, Rockwell hardness M80, Transparent, Water absorption 0.20.3 percent .

CA
1. The material must be pre-dried, drying temperature 7580 degree , drying time 26 hours, specific gravity 1.29.
2. Forming shrinkage rate is about 0.5 percent .
3. Heating temperature 170265 degree , mold temperature 2080 degree .

CAB
1. Heating temperature 170265 degree , mold temperature 2080 degree .
2. Drying temperature 7580 degree , drying time 26 hours.

 CP

1. Heating temperature 170265 degree , mold temperature 2080 degree .

 EVA

 1. temperature setting: injection nozzle 185 degree , front section 166 degree , middle section 160 degree , back section 150 degree ; screw speed max, mold temperature 3545 degree , back pressure 10kg.
2. Material tube temperature 150180 degree , injection nozzle 150 degree , first section 150 degree , second section 140 degree , third section 120 degree , mold temperature 3040 degree , injection pressure 600800kg/cm², molding shrinkage 0.72 percent , drying temperature 4050 degree , drying time 24 hours.

 FR-PET
1. UL long-term heat resistance 140 degree , heat deflection temperature up to 225 degree .
2. Slow crystallization rate, strict drying and processing conditions.
3. Drying: 140 degree for 3 hours or 120 degree for 58 hours. 4. Injection temperature: 235 degree 250 degree 5. Mold temperature: 40 degree 80 degree .

HDPE
1. temperature setting: injection nozzle 210 degree , front section 200 degree , middle section 200 degree , back section 195 degree ; screw speed 140rpm, back pressure 15kg.
2. linear expansion coefficient 0.000100.00013/ degree , molding shrinkage 1.25.0 percent , specific gravity 0.930.97 heat deflection temperature 4349 degree (6082 degree )
HIPS 1. temperature setting: injection nozzle 220240 degree , front section 210230 degree , middle section 200230 degree , back section 190215 degree ; screw speed 135215rpm, mold temperature 25 degree , back pressure 5-10kg specific gravity 1.05g/c.c.

HIPS

1. temperature setting: injection nozzle 220240 degree , front section 210230 degree , middle section 200230 degree , back section 190215 degree ; screw speed 135215rpm, mold temperature 25 degree , back pressure 5-10kg specific gravity 1.05g/c.c.

2. coefficient of linear expansion 0.0000340.00021/ degree , molding shrinkage 0.20.6 percent , heat deflection temperature 96 degree .

LCP Ⅱ

1. density 1.351.45g/cc, deformation temperature 198310 degree , molding shrinkage 0.11.0 percent .
2. fast curing, resin temperature 300 degree , mold temperature 100 degree , injection pressure 300kg/cm², fast injection speed, short forming time, ready drying 150 degree , takes more than 4 hours, glass fiber reinforced 170, fluidity 210.

 LCP Ⅲ
1. density 1.351.45g/cc, deformation temperature 198310 degree , molding shrinkage 0.11.0 percent .
2. fast curing, resin temperature 260 degree , mold temperature 100 degree , injection pressure 300kg/cm², fast injection speed, short forming time, pre-drying 140 degree , 3 hours required, glass fiber reinforced 230.

LDPE

1. temperature setting: injection nozzle 140190 degree , front section 140200 degree , middle section 135195 degree , back section 130180 degree ; screw speed 210220rpm, mold temperature 1070 degree , material tube temperature 150310 degree , back pressure 5-10kg, mold temperature 3050 degree , injection pressure 360500kg/cm².
2. Coefficient of linear expansion 0.000100.00020/ degree , molding shrinkage 1.55.0 percent , specific gravity 0.910.93, heat deflection temperature (3849 degree ).

PA
1. injection temperature and drying temperature must be high; injection pressure and holding pressure should not be too high and too long, to inject the male mold at high speed, there should be exhaust channels to avoid scorching of the rubber; back pressure 50150kg/cm².
 2. The plastic should not be put into the melt cylinder before it reaches the dry level, because it is easy to be stuck in the rod groove of the feeding section with strong water, forming a difficult phenomenon of feeding.
3. When forming, it is easy to cool at the injection nozzle. If the injection pressure is increased during cooling, it is easy to break the check valve, so the temperature control at the injection nozzle must be appropriate. In order to prevent the plastic from overflowing into the mold, it is advisable to use a controlled nozzle.
4. When changing to other plastics for injection, it should be noted that the original nylon heating temperature is 270 degree or more, while the general material heating temperature is only about 200 degree for operation, so the melting barrel must be heated to the nylon heating temperature before operation, otherwise it is easy to break the screw's check valve and dispensing head.
5. The molding method must be observed to produce good results. 6.
6. To prevent the formation of waste edge, precision molds must be used.
7. When using industrial moulds, the temperature of the moulding material should be crystallized.
8. The design of the molded products must prevent depression and consider dimensional stability.
9. The shrinkage rate of molding is about 1.52.5 percent .
10. The heating temperature of nylon 6 (PA6) is 220300 degree , the mold temperature is 100160 degree , the material tube temperature is 200260 degree , the injection material temperature is 220300 degree , the injection pressure is 7002000kg/cm², the minimum operation temperature is 225 degree , the melting point temperature is 215 degree , the molding temperature is 10300 degree , the drying temperature is 75100 degree , the time required is 26 hours, and the use time is 26 hours. It takes 26 hours, using dehumidifying dryer, injection pressure 7502000kg/cm2, material tube temperature 230 degree for the first section; 230 degree for the second section; 220 degree for the third section; 210 degree for the fourth section; mold surface temperature 2570 degree . Coefficient of linear expansion 0.000083/ degree , molding shrinkage 0.62.1 percent , specific gravity 1.11.4 heat deflection temperature 6770 degree (149185 degree ). 11. Nylon 66(PA66) heating temperature 250380 degree , mold temperature 30100 degree , material tube temperature 240300 degree , injection material temperature 250310 degree , injection pressure 6002100kg/cm², minimum operation temperature 260 degree , melting point temperature 215 degree , molding temperature 260320 degree , drying temperature 8090 degree . It takes 36 hours, using dehumidifying dryer, linear expansion coefficient 0.000080.00013/ degree , molding shrinkage 1.32.4 percent , specific gravity 1.11.4, heat deflection temperature 6686 degree . 12. temperature setting: injection nozzle 235265 degree , front section 235245 degree , middle section 210240 degree , rear section 195230 degree ; screw speed 100105rpm, mold temperature 3540 degree , back pressure 5-10kg. 13. density 0.941.14g/cc, deformation temperature 35121 degree , molding shrinkage 0.7 2.5 percent . PAR 1. density 1.171.31g/cc, deformation temperature 95175 degree , molding shrinkage 0.81.0 percent . 2. glass transfer point 190 degree , fast curing, resin temperature 370 degree , mold temperature 130 degree , injection pressure 1000kg/cm², fast injection speed, ordinary forming time, ready drying 140 degree , takes 6 hours, glass fiber reinforced 35, fluidity 50.

 PBT

1. The temperature of the melt cylinder should be controlled at 230270 degree , and the mold temperature should be set at 40 degree 90 degree .

2. When you want to get a good glossy surface, it is advisable to increase the temperature, and if necessary, to carry out sufficient preparatory drying. The required injection pressure is about 5001300kg/m². 3.
3. Temperature setting: nozzle 250 degree , front section 245 degree , middle section 235 degree , back section 230 degree ; screw speed 80rpm, mold temperature 40120 degree , back pressure 10kg, material tube temperature 230270 degree , injection pressure 3001000kg/cm², drying temperature 100140 degree , time required 28 hours.
4. density 1.291.50g/cc, deformation temperature 50110 degree , molding shrinkage 1.32.4 percent , specific gravity 1.31.6.
 PC
 1. The injection pressure is high, and the temperature inside the tube is too high or stagnant for a long time, it is easy to start thermal decomposition, discoloration and reduce the physical properties, so the mold temperature should be 85 degree 120 degree .
 2. It is especially difficult to form thick products because the finished products are prone to residual stress, which will cause future rupture.
 3. High temperature and high pressure are required for forming, so screw type forming shuttle should be used.
4. The material should be sufficiently dried before use.
5. Gates and runners should be designed with low flow resistance. 6.
6. The design of the molded product should be close to the thickness of the flesh to avoid metal parts inlay. Furthermore, the retraction tilt should be above 2 degree .
 7. shrinkage rate 0.40.7 percent , specific gravity 1.21.5. 8. heating temperature 260320 degree , mold temperature 80120 degree , material tube temperature 260310 degree , ejecting material temperature 280320 degree , injection pressure 8001500kg/cm², minimum operating temperature 260 degree . 9. Using dehumidifying dryer, drying temperature is 105120 degree (below 0.020.03 percent ), taking 24 hours, material tube temperature is 260270 degree for the first section; 260270 degree for the second section; 240250 degree for the third section; 220230 degree for the fourth section; mold surface temperature is 4060 degree . 10. temperature setting: injection nozzle 275305 degree , front section 270275 degree , middle section 265275 degree , rear section 250270 degree ; screw speed 50115rpm, mold temperature 60120 degree , injection pressure 7002100kg/cm², back pressure 5-15kg. 11. density 1.20g/cc, deformation temperature 120 146 degree , coefficient of linear expansion 0.000066/ degree , heat deflection temperature 129135 degree (141 degree ),.

PCTFE
1. Design the gate and runner for proper flow. 2. 2. High pressure injection molding machine must be used. 3. 3. Choose the molding conditions that can prevent discoloration. 4. Use anti-corrosion molds and materials and surface treatment. 5. 5. The shrinkage rate of molding is about 0.5 percent .

PE
1. High density PE material has obvious crystallization temperature, so it is better to increase the injection speed. 2. 2. For thick meat products, it is especially important to increase the injection speed: it can improve the surface gloss of the products, prevent warpage, reduce the molding shrinkage, etc. 3. 3. The screw design and non-reverse equipment should be precise, if there is any loss or injury, the material will be added slowly. (Due to the backflow of plastic, the amount of injection into the mold is reduced, and the molten material is backed up in the metering section, so that the new material in the feeding section is retained, causing the metabolism to fail, thus forming the molded products with unsolid quality, strong shrinkage and high defect rate.) 4. The mold design (gate, runner) has a fast material completion speed. 5. Adopt the cooling method with uniform cooling speed. 6. 6. The use of screw molding machine is better, good flowability; no need for high pressure injection pressure, holding pressure should be longer 3060 percent . 7. The shrinkage rate is 2.5 percent and 2.0 percent in the right angle direction. 8. Formed products should be designed to prevent warping and deformation. 9. Low