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Injection mold are often gases with what?
by：CSSSLD
2021-01-23
Injection mold is a kind of in the production of plastic products;
Is to increase the complete structure of plastic products and precise size of the tool.
Injection molding is a mass production of some complex shape parts used when a processing method.
Specific means that a heated melting plastic by injection molding machine high pressure into the mold cavity, after cooling solidification, molded products.
are often gas to produce injection mold, and may be related to the following points: pouring system and the entities of the air in the mold cavity. Some raw materials containing is not dry out the water, they will at high temperature gasification into water vapor. Due to the injection molding temperature is too high, some properties of unstable plastic decomposition and produce gas will happen. Plastic raw materials of some additives volatile or mutual chemical reaction generated gas. The venting is not good why not free at the same time, also need to find out as soon as possible. Injection mold venting is not good also brought plastic parts. Main show is as follows: in the process of plastic melt will replace the gas cavity, if gas discharge will cause the melt filling difficult, not in time lead to insufficient injection quantity rather than full of mold. Out of the gas will be formed in the cavity pressure, and under a certain degree of compression infiltration to the interior of the plastic, have holes, porosity, organization hydrophobic and silver lines and other defects. Because gas is highly compressed, the cavity temperature has risen sharply, resulting in the melt around decomposition, burning, partial carbonation and plastic burning phenomenon. It is mainly appeared at the confluence of two strands of the melt, gate flange. Poor gas purging, into the cavity of the melt velocity is different, so easy to flow marks and weld line formation, and the mechanical properties of plastic. Due to the blocking of the gas in the cavity, can reduce mold filling speed, impact molding cycle, reduce the tax efficiency.
are often gas to produce injection mold, and may be related to the following points: pouring system and the entities of the air in the mold cavity. Some raw materials containing is not dry out the water, they will at high temperature gasification into water vapor. Due to the injection molding temperature is too high, some properties of unstable plastic decomposition and produce gas will happen. Plastic raw materials of some additives volatile or mutual chemical reaction generated gas. The venting is not good why not free at the same time, also need to find out as soon as possible. Injection mold venting is not good also brought plastic parts. Main show is as follows: in the process of plastic melt will replace the gas cavity, if gas discharge will cause the melt filling difficult, not in time lead to insufficient injection quantity rather than full of mold. Out of the gas will be formed in the cavity pressure, and under a certain degree of compression infiltration to the interior of the plastic, have holes, porosity, organization hydrophobic and silver lines and other defects. Because gas is highly compressed, the cavity temperature has risen sharply, resulting in the melt around decomposition, burning, partial carbonation and plastic burning phenomenon. It is mainly appeared at the confluence of two strands of the melt, gate flange. Poor gas purging, into the cavity of the melt velocity is different, so easy to flow marks and weld line formation, and the mechanical properties of plastic. Due to the blocking of the gas in the cavity, can reduce mold filling speed, impact molding cycle, reduce the tax efficiency.
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