In order to let the plastic mold after injection molding what damage or abnormal, we need to mold injection molding certain specifications, the main requirements to meet the following six conditions:
1, off the mold pressure: in principle, should be greater than the total pressure of the plastic injection mold to not flash as a benchmark.
2, pressure and speed have some of the same relationship in the role of the mold. The purpose of the raw materials into the mold can be uniform, thorough, adequate amount of full of corners. Too short will short-shot, shrink, too tall hairy, full, sticky Mold, charred, vulnerable molds and high stress internal adverse phenomena.
3, the speed: the speed determines the speed of raw materials in the mold runner and the finished product in the state, fast flash, over-saturation, scorching, slow emergence of short-shot, shrink, combined with poor and easy to break.
4, temperature: different raw materials, different temperatures, too low solution of plastic color unevenness, finished product stress increases due to the temperature is too low supercharger may cause screw breakage, too high, the product has burrs, but also due to cooling Temperature difference, causing contraction. Raw materials will be decomposed, yellowing, discoloration, easy to break. Cooling time becomes longer, the gas is not easy to discharge, there will be gas.
5, back pressure: screw feed back when the rotation of the resistance known as the back pressure of its role in the transport of raw materials in the compressed more closely.Can make the raw material of air, water from the screw after the release of the sol does not affect the finished surface The gas composition will be low. There will be low bubbles, the surface of the silver pattern. High will overheat, caking, over plastic, long cycle, screw back. At the same time the application of relaxation is very important: back pressure is low, Do not have to (according to the different nature of the raw material not only back pressure.) Be sure to back up with high back pressure and pay attention to the distance or not involved in the air and not glue as a guideline.
6, the mold temperature level and the length of cooling time, affect the finished product of sticky mold, shrinking, size tolerance, surface brightness, cycle, etc., should be timely adjusted according to the actual situation.Other acrylic, PC, Mold temperature, it will not produce bubbles and stress.