How to solve the size difference of the injection molding plastic part issues?
Description for the size difference of the injection molding plastic part:
Changes of the weight and size during the injection molding exceed the production capacity that combine by mold, injection molding machine and plastic.
Reasons for the size difference of the injection molding plastic part
problem that may occur by following:
1,The injection molding plastic enter the injection cylinder uneven
2,Injection cylinder temperature or it’s fluctuation is too large.
3,machine capacity is too small
4,Injection molding pressure is unstable
5,Injection screw reset unstable
6,The change of the operating time or the viscosity of the solution is inconsistent
7,Injection molding speed(or flow control) is unstable
8,Use the plastic varieties that not suitable for the mold
9,Consider the influence of the mold temperature, injection molding pressure, injection molding speed, injection molding time and holding pressure for the injection molding plastic part.
Remedy for above size difference of the injection molding plastic part issues:
1,Check whether there is enough cooling water flowing through the hopper throat to keep the correct temperature.
2,Check whether inferior or loose thermocouple
3,Check whether the thermocouple which use with temperature controller is the right type
4,Check the injection volume and plasticizing capacity,and then compared with the actual injection quantity and injection quantity per hour
5,Check whether each operation have stable melt resin
6,Check whether the backflow preventer valve leak, replace it if needed
7,Check for error feed settings
8,To ensure that the injection screw in each operation of go and back position is stable,not more than 0.4mm changes
9,Check the inconsistencies of the operating time
10,Use back pressure
11,Check the hydraulic system is functioning properly, whether the oil temperature is too high or too low(25-60℃)
12,Select the plastic varieties that suitable for the mold (mainly consider from the shrinkage and mechanical strength) 13,Re-adjust the entire production proces