Why does the injection mold release agent stick to the plastic parts?
November 21, 2022
Whether the demoulding of injection products is smooth or not depends on the reasonable design of the mold structure and the reasonable selection of the process parameters of injection products. In injection molding production, due to the fluctuation of process conditions, it is sometimes difficult to demould products.
In order to ensure the smooth production of injection molding products and avoid the extension of product production cycle due to the difficulty of product demoulding, the cavity surface of the molding die shall be sprayed or coated with a layer of release agent. The selection of release agent shall be determined according to the raw materials for injection products. One of the most widely used release agents is zinc stearate, in addition to polyamide resin; There are also silicone oil type release agents, which have good demoulding effect but are expensive. At present, spray atomized release agent is used for more applications and more convenient operation. TG series of methyl silicone oil, TB series of liquid paraffin and TBM series of castor oil are sold in the market, and their demoulding effects are good. No matter what kind of release agent is used, the amount of release agent used during spraying shall be subject to the successful release of products, and shall be used as little as possible. Excessive amount of spray release agent will affect the appearance quality of the products, causing oil spots or darkening of the product surface, especially for products with high transparency requirements. Sometimes, the application is prohibited. If the apparent quality of the products is required to be high, the release agent can only be applied to the parts where it is difficult to demould the products.
Why does the injection mold release agent stick to the plastic parts? 1. Incorrect method of using injection mold release agent 2. Reasons for excessive injection mold release agent How to solve the above two problems? 1. The correct way to use the dry release agent for injection molding is to make sure that the product model is consistent with the use, shake the bottle evenly, and gently press the valve from 25-30cm away from the spray part to spray evenly. 2. Avoid overspray of injection mold release agent: spray after the solvent volatilizes completely. The distance between the mold and the nozzle should be kept at 25-30cm. It is recommended to spray in parallel.
