Effect of Injection Molding Process Parameters on Molding of Plastic Products
- Apr 14, 2018 -
  1. Excessive injection pressure will result in an increase in product densification (density), and the shrinkage after cooling will be smaller, resulting in an oversized product. When the injection pressure is too small, the opposite is true.

  2. Excessive injection pressure will result in an increase in product densification (density), and the shrinkage after cooling will be smaller, resulting in an oversized product. When the injection pressure is too small, the opposite is true.

  3. Injection molding speed (feeding speed) is too small, it will cause the temperature of the plastic in the mold cavity to show a stepped type, uneven cooling, plastic products become brittle, plastic strength becomes smaller, for the flattening, blasting, pressure test have great Negative Effects.

  4. If the pressure holding time is too long, the product will adhere to the die size in the cooling and shrinking process in the cavity, so that the inner diameter will be larger, and the outer diameter will be slower than the air cooling or water cooling, and the shrinkage time will be extended. Therefore, the outside diameter is small. The advantage of long holding times is that it is easy to control the size and remove residual internal stresses.

  5. If the cavity cooling temperature is too low or the injection temperature is too high, the plastic will rapidly cool down and the residual internal stress will increase, which will be detrimental to the strength.

  6. If the cavity cooling temperature is too low or the injection temperature is too high, the plastic will rapidly cool down and the residual internal stress will increase, which will be detrimental to the strength.

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