- Categories:Industry News
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- Time of issue:2021-10-27 15:26
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(Summary description)The higher the mold temperature, the lower the flow resistance. On many injection molding machines, this naturally means that the flow through the sprue, gate and cavity is faster, because the injection flow control valve used cannot correct this change, and faster filling will result in a greater flow in the sprue and cavity. High effective pressure. May cause flashing. Since the hotter mold does not freeze the plastic that enters the edge area of the flash before the high pressure is formed, the melt will flash around the ejector pin and overflow into the gap of the dividing line. This shows that good injection rate control is required, and some modern flow control programmers can indeed do this.
Generally speaking, a higher mold temperature will reduce the amount of plastic that has a condensation layer in the mold cavity, making it easier for the molten material to flow through the mold cavity, thereby increasing the weight of the part and improving the surface quality. At the same time, the mold temperature will also increase the tensile strength of the part.
Mold insulation. Many molds, especially thermoplastics, work at relatively high temperatures, such as 80 degrees Celsius or 176 degrees Fahrenheit. If the mold is not insulated, the heat lost to the air and injection molding machine can easily be as much as the heat lost from the injection barrel. Therefore, the mold and the board should be insulated, and if possible, the mold surface should be insulated. If considering the hot runner mold, the heat exchange between the hot runner part and the cooling injection part should be minimized. This can reduce energy loss and warm-up time.
(Summary description)The higher the mold temperature, the lower the flow resistance. On many injection molding machines, this naturally means that the flow through the sprue, gate and cavity is faster, because the injection flow control valve used cannot correct this change, and faster filling will result in a greater flow in the sprue and cavity. High effective pressure. May cause flashing. Since the hotter mold does not freeze the plastic that enters the edge area of the flash before the high pressure is formed, the melt will flash around the ejector pin and overflow into the gap of the dividing line. This shows that good injection rate control is required, and some modern flow control programmers can indeed do this.
Generally speaking, a higher mold temperature will reduce the amount of plastic that has a condensation layer in the mold cavity, making it easier for the molten material to flow through the mold cavity, thereby increasing the weight of the part and improving the surface quality. At the same time, the mold temperature will also increase the tensile strength of the part.
Mold insulation. Many molds, especially thermoplastics, work at relatively high temperatures, such as 80 degrees Celsius or 176 degrees Fahrenheit. If the mold is not insulated, the heat lost to the air and injection molding machine can easily be as much as the heat lost from the injection barrel. Therefore, the mold and the board should be insulated, and if possible, the mold surface should be insulated. If considering the hot runner mold, the heat exchange between the hot runner part and the cooling injection part should be minimized. This can reduce energy loss and warm-up time.
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2021-10-27 15:26
- Views:
The higher the mold temperature, the lower the flow resistance. On many injection molding machines, this naturally means that the flow through the sprue, gate and cavity is faster, because the injection flow control valve used cannot correct this change, and faster filling will result in a greater flow in the sprue and cavity. High effective pressure. May cause flashing. Since the hotter mold does not freeze the plastic that enters the edge area of the flash before the high pressure is formed, the melt will flash around the ejector pin and overflow into the gap of the dividing line. This shows that good injection rate control is required, and some modern flow control programmers can indeed do this.
Generally speaking, a higher mold temperature will reduce the amount of plastic that has a condensation layer in the mold cavity, making it easier for the molten material to flow through the mold cavity, thereby increasing the weight of the part and improving the surface quality. At the same time, the mold temperature will also increase the tensile strength of the part.
Mold insulation. Many molds, especially thermoplastics, work at relatively high temperatures, such as 80 degrees Celsius or 176 degrees Fahrenheit. If the mold is not insulated, the heat lost to the air and injection molding machine can easily be as much as the heat lost from the injection barrel. Therefore, the mold and the board should be insulated, and if possible, the mold surface should be insulated. If considering the hot runner mold, the heat exchange between the hot runner part and the cooling injection part should be minimized. This can reduce energy loss and warm-up time.