What are the conditions for injection molding?

1. Pay attention to the design of the formed products if there is the possibility of pot cracking.For special cases, use more than 1° of retraction incline, and pay attention to the mold should not have low sag part.

2. The forming shrinkage rate is about 0.45%, the heating temperature is 170~310℃, the hot air dryer is used, the drying time is 2~3 hours (below 0.1%), the drying temperature is 80~100℃, the material tube temperature is 180~290℃.

3. Temperature setting: nozzle 205-240 ℃, front section 190-235 ℃, middle section 180-230 ℃, rear section 180-210 ℃;Screw speed of 70~150rpm, mold temperature of 35~80℃, injection pressure of 700~2300kg/cm;, holding pressure 30~ 60%, back pressure 100~200kg/cm;.

4. Linear expansion coefficient of 0.00006~0.00008/℃, forming shrinkage rate of 0.2~ 0.7%,The thermal deformation temperature is 91~93℃ (88~99℃), the glass transfer temperature is 125℃, the conductivity is 0.0003 cal.cm.s.m /℃, the density is 1.06~1.08g/cm, the tensile strength is 650~800kgf, the tensile strength is 2~ 3%, the elastic coefficient is 32,000 ~37000Kgf /cm, 2.1~3.2 Kgf. Cm /cm, Rockwell hardness M80, transparency, water absorption 0.2~ 0.3%.