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Injection mold set exhaust system
by：CSSSLD
2021-02-03
Injection mould of
injection mold consists of two parts, dynamic model and fixed model, dynamic model is installed on the movement of the injection molding machine templates, fixed die is installed on the injection moulding machine fixed template. Dynamic model in injection molding and mold closing a gating system and the cavity, cavity when moving die and die separation in order to take out the plastic products. Structure though because of the plastic varieties and properties of the mould, the shape and structure of the plastic products and the type of injection machine and so on different and might go, but the basic structure is the same. Mold is mainly composed of gating system, air-conditioning system, molding parts and structural parts. The pouring system and is part of the direct contact with plastic molding parts, and with the plastic and products, is the most complicated in the mold, the biggest change, request processing smoothness and accuracy of the highest part. Gating system refers to the plastic from the nozzle into the mold cavity in front of the flow channel section, including the mainstream way, slag hole, distributary channel and gate, etc. Molding parts refers to the various parts of the product shape, including the moving die, die and cavity, core, molding and vent, etc.
set the cause of the exhaust system of injection moulds
plastic mold exhaust is an important factor in mold design, especially in the rapid molding, more strict with exhaust of injection moulds.
the source of the gas in the injection mold. 一个。 Gating system and the entities of the air in the mold cavity. b。 Some raw materials containing is not dry out the water, they are under the high temperature gasification into water vapor. c。 Because when we do the injection temperature is too high, some properties of unstable gas produced by plastic decompose. d。 Plastic raw materials of some additives volatile or each other chemical reaction generated gas.
the dangers of poor exhaust
plastic mold venting is not good, will be the quality of plastic parts from many aspects, such as a series of harm. The main performance is as follows: 1. In injection molding process, the melt will replace the gas cavity, if gas discharge not in time, will cause the melt filling difficult, due to insufficient injection quantity rather than full of cavity. 2. Ruled out of the gas will be formed in the cavity pressure, and infiltration under a certain degree of compression plastic inside, cause porosity, empty, loose organization, and other defects. 3. 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, R Angle and the gate of flange. 4. 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. 5. Due to the blocking of the gas in the cavity, can reduce mold filling speed, impact molding cycle, reduce the production efficiency. Plastic pieces of bubble distribution in the
three main points of the source of the gas in the mould cavity stored up in the air; Decomposition of gas in the raw material; Raw materials in the residual water evaporation of water vapor, the location of the bubbles generated due to the different sources are also different. 1. The cavity of stored up in the air bubbles and often distributed in opposite gate area. 2. Plastic raw materials in the decomposition or chemical reaction, the bubble distribution through the thickness of the plastic parts. 3. Plastic raw materials in the remaining water gasification, the bubble was irregularly distributed in the entire history of the plastic parts.
injection mold consists of two parts, dynamic model and fixed model, dynamic model is installed on the movement of the injection molding machine templates, fixed die is installed on the injection moulding machine fixed template. Dynamic model in injection molding and mold closing a gating system and the cavity, cavity when moving die and die separation in order to take out the plastic products. Structure though because of the plastic varieties and properties of the mould, the shape and structure of the plastic products and the type of injection machine and so on different and might go, but the basic structure is the same. Mold is mainly composed of gating system, air-conditioning system, molding parts and structural parts. The pouring system and is part of the direct contact with plastic molding parts, and with the plastic and products, is the most complicated in the mold, the biggest change, request processing smoothness and accuracy of the highest part. Gating system refers to the plastic from the nozzle into the mold cavity in front of the flow channel section, including the mainstream way, slag hole, distributary channel and gate, etc. Molding parts refers to the various parts of the product shape, including the moving die, die and cavity, core, molding and vent, etc.
set the cause of the exhaust system of injection moulds
plastic mold exhaust is an important factor in mold design, especially in the rapid molding, more strict with exhaust of injection moulds.
the source of the gas in the injection mold. 一个。 Gating system and the entities of the air in the mold cavity. b。 Some raw materials containing is not dry out the water, they are under the high temperature gasification into water vapor. c。 Because when we do the injection temperature is too high, some properties of unstable gas produced by plastic decompose. d。 Plastic raw materials of some additives volatile or each other chemical reaction generated gas.
the dangers of poor exhaust
plastic mold venting is not good, will be the quality of plastic parts from many aspects, such as a series of harm. The main performance is as follows: 1. In injection molding process, the melt will replace the gas cavity, if gas discharge not in time, will cause the melt filling difficult, due to insufficient injection quantity rather than full of cavity. 2. Ruled out of the gas will be formed in the cavity pressure, and infiltration under a certain degree of compression plastic inside, cause porosity, empty, loose organization, and other defects. 3. 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, R Angle and the gate of flange. 4. 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. 5. Due to the blocking of the gas in the cavity, can reduce mold filling speed, impact molding cycle, reduce the production efficiency. Plastic pieces of bubble distribution in the
three main points of the source of the gas in the mould cavity stored up in the air; Decomposition of gas in the raw material; Raw materials in the residual water evaporation of water vapor, the location of the bubbles generated due to the different sources are also different. 1. The cavity of stored up in the air bubbles and often distributed in opposite gate area. 2. Plastic raw materials in the decomposition or chemical reaction, the bubble distribution through the thickness of the plastic parts. 3. Plastic raw materials in the remaining water gasification, the bubble was irregularly distributed in the entire history of the plastic parts.
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