What safety precautions should be paid attention to when processing plastic molds

November 27, 2023

1. The shrinkage coefficient of each material is different, and plastic molds should have a reasonable shrinkage rate.
2. Plastic molds need to have sufficient stiffness, otherwise they 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 (although some injection molding machines do not have this function).
4. Choose a reasonable demolding method, choose a reasonable position and quantity of top rods, to ensure that the product is not damaged during the ejection process.
5. The cooling (water passage) in plastic mold processing is related to factors such as product size, shape, plastic properties, and holding time.
6. The processing of plastic molds requires selecting a reasonable exhaust position and controlling its amount. Otherwise, it may cause dissatisfaction with the plastic injection and result in a shortage of materials in the product.
7. The plastic mold processing and injection molding machine fixing method should be reasonable, reliable and firm, to prevent accidents caused by displacement during mold closing. And it should be easy to disassemble.
8. The plastic mold moves along 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 (with equal flow paths), and there should be sufficient storage to ensure that the plastic is supplied during the shrinkage process.
10. The post-treatment of plastic mold materials is not necessary because plastic is soft and does not require any hardness requirements, and the heat treatment process may cause mold deformation.
11. The roughness level of the inner cavity of the plastic mold should reach "mirror level", otherwise the product is difficult to demold, and excessive force is required to eject the product, resulting in product damage. The roughness of positioning pins, clamping surfaces, and other parts are all standardized.

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Author:

Ms. cai

E-mail:

sales413@cn-moulds.com

Phone/WhatsApp:

+8613144982886

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