How to solve parts short filling?

We can prevent to make Mold flow to make simulation of injection Molding like Mold filling, balance, cooling, etc before Mold making.

So Mold flow is a way to reduce the risks of short filling.

What's the reason of short filling and how to improve it when we face this issues?

Reason:

Injection Molded parts have insufficient filling. The reason could be from 5 types of possibily  in two types of possibily enviroment. One is poor injection Molding.

One is becaused by operating factors, and the other is caused by poor design of injection Molded parts.

Most of the defects caused by injection Molding process are caused by the plastic from the gate to the completion of filling.

The influence of temperature drop and pressure drop.

Defects caused by poor design of injection Molded parts are mostly due to poor/too far gate opening, uneven thickness, and excessive overall glue position.

Thin, special design limitations, poor venting, etc.

Improvement methods:

a) Plastic

． Change to a higher flow grade

b) Mould

． Optimize gate opening location

． Optimize plastic part wall thickness

． Optimize special design

． Check/add mold vents

． Adding auxiliary sub-flow to the molded parts

c) Injection Molding machine conditions

． Increase injection Molding capacity

． Increase the injection melt temperature

． Increase plastic pressure/holding pressure

． Increase injection speed

． Increase injection time

． Increase mold temperature

． Reduce clamping pressure

． Use special injection Molding machine