Reason injection molding machine injection mold often discharged gas

Date：2016-07-14 09:58:21

Injection molding machine injection mold often gases, with the following points may be relevant.

(1) injection molding machine with a mold cavity gating system there air.

(2) some starting material containing moisture is not excluded dried, they are gasified at a high temperature steam.

(3) because the injection molding machine temperature is too high, the unstable nature of some plastics will decompose to generate gas.

(4) injection molding machine in plastic material or volatilization of certain additives mutual chemical reaction gases.

2, while the exhaust poor poor reason, also need to find out as soon as possible. Poor injection mold plastic parts to exhaust also brought trouble. Mainly as follows:

(1) In the injection molding machine will replace the experience of the melt in the cavity of the gas, if the gas is not discharged in time will cause difficulties in filling the melt, leading to lack of MCP-T360 injection amount can not be filled cavity.

(2) exclusion of poor gas will form a high pressure in the cavity, and in a certain degree of compression penetrate to the interior of the plastic, resulting in voids, pores, sparse tissue with silver streaks and other defects.

(3) because the gas is highly compressed, so that a sharp rise in the temperature of the cavity, thereby causing the surrounding melt decomposition, burning, plastic parts with a partial carbonization burning phenomenon. It is mainly the current two strands of the melt at the confluence of the gate at the flange.

(4) the exclusion of poor gas, so that the speed of the melt into each cavity is different, so easy to form flow mark with weld line, and to reduce the mechanical properties of plastic parts.

(5) Because impede cavity gas will reduce the filling velocity, cycle time, reduce the tax efficiency.

3, plastic injection molding machine in bubble distribution

(1) air bubbles accumulated in the cavity produced, often located on the opposite site of the gate with.

(2) injection molding machine plastic material decomposition or chemical reaction produces bubbles are distributed along the thickness of plastic parts.

(3) injection molding machine plastic material produced by gasification of residual water bubbles are irregularly distributed throughout the plastic parts.

【Return】