Shenzhen mold manufacturer: During the production and processing of injection molds, attention should be paid at 11 o’clock. The temperature of the injection mold has 5 effects on the plastic parts
Recently, many friends have asked which points need to be paid attention to when using injection molds. Today, Shanghai Prionni will take you to see what points need to be paid attention to when using injection molds!
1. The shrinkage coefficient of each material is different, and injection molds need to have a reasonable shrinkage rate.
2. The injection mold needs to have sufficient stiffness, otherwise it will deform during mold closing and pressure holding, causing flash
3. If the product is ejected while opening the mold, the top needle page of the injection molding machine can be set.
4. We need to choose a reasonable demolding method and a reasonable position and quantity of top rods to ensure that the product is not damaged during the ejection process.
5. The cooling in injection molds is related to factors such as product size, shape, plastic properties, and holding time.
6. The injection mold should choose a reasonable exhaust position and control its amount. Otherwise, if the plastic injection is not sufficient, the product will be “out of stock”
7. The fixing method of injection mold and injection molding machine should be reasonable, reliable and firm, to prevent accidents caused by displacement during mold closing. And it should be easy to disassemble.
8. The injection mold moves with the moving part of the injection molding machine without a return spring, and is connected to the top needle plate of the mold and the top needle rod of the machine (commonly known as a strong top).
9. The injection channel should be selected reasonably to ensure that the material can reach every point evenly, and there should be sufficient storage capacity to ensure that the plastic is supplied during the shrinkage process.
10. The post-treatment of injection mold materials is not necessary because plastic is soft and does not require any special requirements such as hardness, and the heat treatment process may cause mold deformation.
11. The roughness level of the injection mold cavity needs to be mirror level, otherwise it is difficult for the product to be demolded, and excessive force during product ejection can cause damage to the product.
Shenzhen mold manufacturer: During the production and processing of injection molds, attention should be paid at 11 o’clock. The temperature of the injection mold has 5 effects on the plastic parts
There are many reasons that affect the cooling of injection molds, such as the shape of the plastic part and the design of the parting surface, the type of cooling medium, temperature, flow rate, geometric parameters of the cooling pipeline, our spatial layout, mold material, melt temperature, and plastic part requirements, all of which have a certain impact on the temperature of the injection mold on the plastic part. Now let’s take a detailed look together.
1. A lower mold temperature can achieve a reduction in the shrinkage rate of plastic parts during molding.
The uniformity of mold temperature, short cooling time, and fast injection speed can reduce the warping deformation of plastic parts.
3. For crystalline polymers, increasing the mold temperature can stabilize the size of the plastic parts and avoid post crystallization phenomena, but it will lead to defects such as prolonged molding cycles and brittle plastic parts.
As the crystallinity of crystalline polymers increases, the stress cracking resistance of plastics decreases, so lowering the mold temperature is beneficial. However, for high viscosity amorphous polymers, their resistance to cracking is directly related to the internal stress of the plastic part. Therefore, increasing the mold temperature and filling speed, and reducing the replenishment time are beneficial.
If we increase the temperature of the mold, it can improve the surface quality of the plastic parts. The determination of mold temperature is a process in injection molding, and the temperature of the mold can directly affect plastic filling, shaping of plastic parts, molding cycle, and molding quality. That’s all for this video sharing. If you want to know more about injection mold content, please consult us in a timely manner!
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