Design injection mold cooling system is very important. Cooling time is the longest circle in injection molding process, it takes up 50~80% of molding circle. Molten plastic has high temperature, If we don’t make cooling channels, the molding circle is very long, it is cause of molded defect as bending, sink marks, weld line, short […]
Plastic molding
Plastics injection mold design calculate cavity quantity
Have you ever been worried when calculate cavity quantity of injection mold design? Do you want to know how many cavities are suitable for your machine? I think you don’t want to use 250 tone machine for production small items, it is very to waste your money. How to calculate the cavities number of injection […]
slider cooling channel construction in mold injection
Why do we need slider cooling channel in mold injection? A slider core used to solve undercut of product. It is separate with a core and cavity plate. As you know, in injection molding process, molten plastic was ejected into mold by high pressure of cylinder. Temperature of molten plastic will heat up slider core. If […]
injection molding troubleshooting sink mark defect
Sink marks appear when thermal shrinkage of plastics material is not compensated. A sink mark usually appear at rib, boss position, or thickness of product is changed. This post I will explain about cause and sink mark troubleshooting. I. Sink mark causes. + Thickness of product is not equal, samples usually have sink marks at transfer […]
injection molding troubleshooting flash defect
Injection molding troubleshooting flash defect usually appears near parting line, gas vent, slide core, or ejector pin. Burr looks like a develop film like a plastic edge. I. Causes of flash injection molding. + Material effect. For example, GF resin always have flash. It is difficult to improve flash. + Mold has gap between the […]
injection molding short shot troubleshooting
In injection molding short shot defect cause by molten plastic does not fill the cavity, product marking is incomplete. I. Cause of short shot. + Molten plastics are stick or cold in runner system. + Mold structure is not good so molten plastics can not fill in the cavity. + In injection molding process, air […]