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°. 4.
4. The shrinkage rate must be about 0.5%. 5.
5. Commonly used for gold plated products, the precautions are as follows: (1) The material tube temperature should be high, about 220℃~250℃ (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 180~290℃, mold temperature 50~80℃, material tube temperature 200~230℃, ejecting material temperature 200~240℃, injection pressure 700~1500kg/cm², minimum operation temperature 260℃.
7. Using hot air dryer, drying temperature 80~100℃, time required 2~4 hours (less than 0.3%), material tube temperature 220~240℃ for the first section; 210~240℃ for the second section; 180~230℃ for the third section; 150~180℃ for the fourth section; mold surface temperature 50~90℃, injection pressure 500~2100kg/cm².
8. Temperature setting: injection nozzle 203~295℃, front section 220~295℃, middle section 210~290℃, back section 180~210℃; screw speed 70~150rpm, mold temperature 10~80℃, holding pressure 30~60%, back pressure 100~250kg/cm².
9. density 1.04~1.06g/cc, deformation temperature 82~122℃, molding shrinkage 0.4~0.8%, specific gravity 1.0~1.2, linear expansion coefficient 0.00006~0.00013/℃, molding shrinkage 0.3~0.8%, heat deformation temperature 66~107℃ (88~113℃).

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°, and pay attention to the mold must not have a low sink part.
2. Forming shrinkage rate is about 0.45%, heating temperature 170~310℃, using hot air dryer, drying time 2~3 hours (less than 0.1%), drying temperature 80~100℃, material tube temperature 180~290℃, 3.
3. temperature setting: injection nozzle 205~240℃, front section 190~235℃, middle section 180~230℃, back section 180~210℃; screw speed 70~150rpm, mold temperature 35~80℃, injection pressure 700~2300kg/cm², holding pressure 30~60%, back pressure 100~200kg/cm².
4. linear expansion coefficient 0.00006~0.00008/℃, molding shrinkage 0.2~0.7%, heat deflection temperature 91~93℃ (88~99℃), glass transfer temperature 125℃, conduction coefficient 0.0003cal.cm.s.sm/℃, density 1.06~1.08g/cm³, tensile strength 650~800kgf/cm², Elongation 2~3%, Elasticity 32000~37000 kgf/cm², 2.1~3.2kgf.cm/cm, Rockwell hardness M80, Transparent, Water absorption 0.2~0.3%.

CA
1. The material must be pre-dried, drying temperature 75~80℃, drying time 2~6 hours, specific gravity 1.29.
2. Forming shrinkage rate is about 0.5%.
3. Heating temperature 170~265℃, mold temperature 20~80℃.

CAB
1. Heating temperature 170~265℃, mold temperature 20~80℃.
2. Drying temperature 75~80℃, drying time 2~6 hours.

 CP

1. Heating temperature 170~265℃, mold temperature 20~80℃.

 EVA

 1. temperature setting: injection nozzle 185℃, front section 166℃, middle section 160℃, back section 150℃; screw speed max, mold temperature 35~45℃, back pressure 10kg.
2. Material tube temperature 150~180℃, injection nozzle 150℃, first section 150℃, second section 140℃, third section 120℃, mold temperature 30~40℃, injection pressure 600~800kg/cm², molding shrinkage 0.7~2%, drying temperature 40~50℃, drying time 2~4 hours.

 FR-PET
1. UL long-term heat resistance 140℃, heat deflection temperature up to 225℃.
2. Slow crystallization rate, strict drying and processing conditions.
3. Drying: 140℃ for 3 hours or 120℃ for 5~8 hours. 4. Injection temperature: 235℃~250℃ 5. Mold temperature: 40℃~80℃.

HDPE
1. temperature setting: injection nozzle 210℃, front section 200℃, middle section 200℃, back section 195℃; screw speed 140rpm, back pressure 15kg.
2. linear expansion coefficient 0.00010~0.00013/℃, molding shrinkage 1.2~5.0 %, specific gravity 0.93~0.97 heat deflection temperature 43~49℃ (60~82℃)
HIPS 1. temperature setting: injection nozzle 220~240℃, front section 210~230℃, middle section 200~230℃, back section 190~215℃; screw speed 135~215rpm, mold temperature 25℃, back pressure 5-10kg specific gravity 1.05g/c.c.

HIPS

1. temperature setting: injection nozzle 220~240℃, front section 210~230℃, middle section 200~230℃, back section 190~215℃; screw speed 135~215rpm, mold temperature 25℃, back pressure 5-10kg specific gravity 1.05g/c.c.

2. coefficient of linear expansion 0.000034~0.00021/℃, molding shrinkage 0.2~0.6%, heat deflection temperature 96℃.

LCP Ⅱ

1. density 1.35~1.45g/cc, deformation temperature 198~310℃, molding shrinkage 0.1~1.0%.
2. fast curing, resin temperature 300℃, mold temperature 100℃, injection pressure 300kg/cm², fast injection speed, short forming time, ready drying 150℃, takes more than 4 hours, glass fiber reinforced 170, fluidity 210.

 LCP Ⅲ
1. density 1.35~1.45g/cc, deformation temperature 198~310℃, molding shrinkage 0.1~1.0%.
2. fast curing, resin temperature 260℃, mold temperature 100℃, injection pressure 300kg/cm², fast injection speed, short forming time, pre-drying 140℃, 3 hours required, glass fiber reinforced 230.

LDPE

1. temperature setting: injection nozzle 140~190℃, front section 140~200℃, middle section 135~195℃, back section 130~180℃; screw speed 210~220rpm, mold temperature 10~70℃, material tube temperature 150~310℃, back pressure 5-10kg, mold temperature 30~50℃, injection pressure 360~500kg/cm².
2. Coefficient of linear expansion 0.00010~0.00020/℃, molding shrinkage 1.5~5.0%, specific gravity 0.91~0.93, heat deflection temperature (38~49℃).

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 50~150kg/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℃ or more, while the general material heating temperature is only about 200℃ 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 1.5~2.5%.
10. The heating temperature of nylon 6 (PA6) is 220~300℃, the mold temperature is 100~160℃, the material tube temperature is 200~260℃, the injection material temperature is 220~300℃, the injection pressure is 700~2000kg/cm², the minimum operation temperature is 225℃, the melting point temperature is 215℃, the molding temperature is 10~300℃, the drying temperature is 75~100℃, the time required is 2~6 hours, and the use time is 2~6 hours. It takes 2~6 hours, using dehumidifying dryer, injection pressure 750~2000kg/cm2, material tube temperature 230℃ for the first section; 230℃ for the second section; 220℃ for the third section; 210℃ for the fourth section; mold surface temperature 25~70℃. Coefficient of linear expansion 0.000083/℃, molding shrinkage 0.6~2.1%, specific gravity 1.1~1.4 heat deflection temperature 67~70℃ (149~185℃). 11. Nylon 66(PA66) heating temperature 250~380℃, mold temperature 30~100℃, material tube temperature 240~300℃, injection material temperature 250~310℃, injection pressure 600~2100kg/cm², minimum operation temperature 260℃, melting point temperature 215℃, molding temperature 260~320℃, drying temperature 80~90℃. It takes 3~6 hours, using dehumidifying dryer, linear expansion coefficient 0.00008~0.00013/℃, molding shrinkage 1.3~2.4%, specific gravity 1.1~1.4, heat deflection temperature 66~86℃. 12. temperature setting: injection nozzle 235~265℃, front section 235~245℃, middle section 210~240℃, rear section 195~230℃; screw speed 100~105rpm, mold temperature 35~40℃, back pressure 5-10kg. 13. density 0.94~1.14g/cc, deformation temperature 35~121℃, molding shrinkage 0.7~ 2.5%. PAR 1. density 1.17~1.31g/cc, deformation temperature 95~175℃, molding shrinkage 0.8~1.0%. 2. glass transfer point 190℃, fast curing, resin temperature 370℃, mold temperature 130℃, injection pressure 1000kg/cm², fast injection speed, ordinary forming time, ready drying 140℃, takes 6 hours, glass fiber reinforced 35, fluidity 50.

 PBT

1. The temperature of the melt cylinder should be controlled at 230~270℃, and the mold temperature should be set at 40℃~90℃.

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 500~1300kg/m². 3.
3. Temperature setting: nozzle 250℃, front section 245℃, middle section 235℃, back section 230℃; screw speed 80rpm, mold temperature 40~120℃, back pressure 10kg, material tube temperature 230~270℃, injection pressure 300~1000kg/cm², drying temperature 100~140℃, time required 2~8 hours.
4. density 1.29~1.50g/cc, deformation temperature 50~110℃, molding shrinkage 1.3~2.4%, specific gravity 1.3~1.6.
 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℃~120℃.
 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°.
 7. shrinkage rate 0.4~0.7%, specific gravity 1.2~1.5. 8. heating temperature 260~320℃, mold temperature 80~120℃, material tube temperature 260~310℃, ejecting material temperature 280~320℃, injection pressure 800~1500kg/cm², minimum operating temperature 260℃. 9. Using dehumidifying dryer, drying temperature is 105~120℃ (below 0.02~0.03%), taking 2~4 hours, material tube temperature is 260~270℃ for the first section; 260~270℃ for the second section; 240~250℃ for the third section; 220~230℃ for the fourth section; mold surface temperature is 40~60℃. 10. temperature setting: injection nozzle 275~305℃, front section 270~275℃, middle section 265~275℃, rear section 250~270℃; screw speed 50~115rpm, mold temperature 60~120℃, injection pressure 700~2100kg/cm², back pressure 5-15kg. 11. density ~1.20g/cc, deformation temperature 120~ 146℃, coefficient of linear expansion 0.000066/℃, heat deflection temperature 129~135℃ (141℃),.

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%.

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 30~60%. 7. The shrinkage rate is 2.5% and 2.0% in the right angle direction. 8. Formed products should be designed to prevent warping and deformation. 9. Low