English
русский
Parting surface venting of runner system
There are a large amount of gas in the main and sub channel, these gas are discharged through the pull rod (push rod) during injection processing, a part of gas come out from exhaust slot on parting surface, rest of gas will enter the cavity with plastic melt together, but it is better to have less gas inside cavity to reduce the venting cavity.
The gas in therunner system should be mainly discharged through the parting surface, the exhaust slot of the gating system is mainly opened at the end of the runner, as shown in picture 1.
The exhaust slot design of the runner:
The depth of the exhaust slot (h) is as deep as the flash edge at the end of the runner;
1. Plastic with good fluidity, h≈0.075mm;
2. Plastic with poor fluidity, h≈0.125m;
The width of the exhaust slot is the same as that of the runner, and the entrance should be polished;
The injection pressure at the runner is high, and the exhaust slot should not be facing the operator.
The sub gate of the plastic injection mold runner system
Jan 26, 2022In order to get the best injection quality, the gate type must be selected carefully, the coommon gate tyeps are: direct gate, side gate, pin-point gate, sub gate,valve gate of hot runner etc. Among...view
Insert pin of vengting design for molded parts
Mar 20, 2022Insert pin of venting: It is difficult to make exhaust slot when end runner is not in parting surface during injection, and there is no matching gap available, but we could make the venting pin at end...view
Classification of side parting and core pulling mechanism
Jul 17, 2022According to the structural characteristics of plastic moulding, the side core-pulling mechanisms are divided into the following six categories: 1. The side core-pulling mechanism of "slider + guide...view
Controling method of plastic injection mold temperature
Feb 15, 2022Except for heat radiation and heat convection from the mold, most of the heat bring into the mold by the plastic needs to be taken out of the mold by the circulating heat transfer medium by heat...view
What is Called Draft Angle?
Dec 29, 2021The draft angle is also called demold angle and angle which is used for product removal from the mold and designed on the parting surface, the angle is called draft angle which shows in picture 1....view
Plastic injection mold runner system design points
Jan 9, 2022When designing the gating system, Firstly, we should consider making the plastic melt fill the cavity with core side quickly to reduce pressure and heat loss; secondly, it should be economically...view