How To Make Use Of Back Pressure in Injection Molding Process

In the injection molding process, it is often difficult to solve the shrinkage of a certain part of the product. In this case, only by using the back pressure and adjusting the back pressure parameters properly can we solve the problem.

plastic injection mold

The reason for using back pressure is that when the screw rotates, the hot plasticized plastic is pushed forward under the action of the screw and reaches the front of the screw through the stop valve. As the molten material moves forward, the molten material produces a reaction force, which acts on the screw and the stop valve, making the screw move backward so that more molten material moves forward. At this time, if the back pressure is adjusted, the cylinder has a certain pressure from the back to the front on the screw, It provides resistance for the screw to retreat. The greater the back pressure is, the longer the screw reset time is. The pressure generated by the molten material at the front of the screw must be greater than the back pressure before the screw can retreat. It must be pointed out that not all injection molding production must use back pressure, but if back pressure is used, the plastic can be fully melted and mixed evenly.

The use of back pressure in the injection molding process has more advantages: First, it is conducive to the emission of volatile gases in the melt. 2、 Make the additive and molten material mix more evenly. 3、 Make the plastic plasticization more uniform, etc.

Eight Common Injection Mold Structure Classification

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Eight common injection mold structure classification One. Single parting surface injection mold When the mold is opened, the movable mold and the fixed mold are separated, so as to take out the plastic parts, which is called single parting surface mold, also called double-plate mold. It is the simplest and most basic form of injection mold, which can be designed as single-cavity injection mold or multi-cavity injection mold according to the need, and is the

Injection Mold Manufacturing Process And The Basic Processing Process Analysis

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Injection mold manufacturing process and the basic processing process analysis The injection mold manufacturing process mainly includes. Acceptance of the task. Mold design. Mold manufacturing. Mold inspection and mold trial. Mold modification and repair. Mold maintenance. I. Acceptance of tasks Plastic mold making, first of all, the customer engineers provide product drawings to the mold manufacturer, the manufacturer through the molding plastic production task requirements, the process of collecting, analyzing, digesting product data, this is

The Difference Between Injection Moulds And Plastic Moulds

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The difference between injection moulds and plastic moulds Many people can’t tell the difference between injection molds and plastic molds, and many people even think that they are the same kind of molds, just called different. Although injection molds and plastic molds are both molds, but there is a difference between them. Want to figure out the difference between the two, first and Xiaobian together to understand what is injection mold, what is plastic mold.