The principle of mold temperature balance in plastic mold cooling system design
The principle of mold temperature balance:
1. Due to the complexity of the plastic parts and mold structure, it is difficult to make the temperature of the mold completely consistent, but should be make the mold temperature as balanced as possible, and there should be no local overheating or overcooling.
2. The high temperature areas in the mold including: near the sprue bushing, near the gate, and near the thick wall of the plastic part, these areas should be cooled.
3. Heating is sometimes required at thin-walled areas.
4. During the cooling process of the mold, due to the phenomenon of thermal expansion and contraction, the plastic part will slightly detach from the fixed mold cavity when the solid shrinks, while the tightening force on the core is getting bigger and biggger, and the plastic part is detaching, the more heat before demolding is transferred to the core, so the core must be focused on cooling.
5. To control the temperature difference of the cooling water at the inlet and outlet of the cooling channel, the temperature difference should be less than or equal to 2°C during precision injection molding, and in general, the temperature difference should be less than or equal to 5°C. the total length of the cooling gate (series length) should not be too long, preferably less than 1.5m, and the length of the dead zone should be as short as possible.
6. The cooling channel must be designed for the stripper in the three-plate mold, t, so that the mold temperature can be stabilized during the production process and the molding cycle can be shortened.
.png)

Plastic molding shrinkage rate
Dec 30, 2021Plastic parts getting smaller by shrink, due to the temperature decrease during the molding process, and the shrinkage is expressed by the shrinkage rate, it is common plastic shrinkage rates are...view
Slider of side core pulling mechanisum assembling
Jul 21, 2022The picture 1 shows a typical guide pin driven slider parting and core-pulling mechanism, we will talk about the composition and function of the lateral core-pulling mechanism. 1. Lateral forming...view
Venting system of plastic injection mold introduction
Feb 27, 2022Hello everyone, thanks for attention. We’ve discussed about the temperature control system earlier, now we are going to talk about the mold venting information in following 11 articles, from the...view
Design principle of plastic injection mold cooling system
Feb 13, 2022Design principle of cooling system In order to improve the efficiency of the cooling system and make the cavity surface temperature distribution even, the following principles should be followed in...view
What is Ejection Molding?
Dec 28, 2021The process to get injection molded products is called injection molding, or called injection. Injection molding is an important method in polymer molding processing, it is characterized by a short...view
Slider designing tips 2
Nov 22, 20239. The molding parting surface of the slider molding should be made as a shut-off surface as possible, and the width of the shut-off part should be at least 8mm, and do not make a shut-off surface;...view
English
русский



_20250310164515A048.webp)