1. The plasticizing capacity of the machine is too small, and the plastic is not fully plasticized in the barrel; The plasticizing capacity of the machine is too large, the plastic is heated and sheared in the barrel for too long, and the plastic is easy to age, making the product brittle.
2. If the diversion channel of the mold is too small or improperly configured, it should be arranged as balanced and reasonable as possible or the size of the diversion channel should be increased.
3. The mold temperature is too high and it is difficult to demould; The mold temperature is too low, the plastic cools prematurely, the fusion joint is poor, and it is easy to crack, especially for high melting point plastics such as polycarbonate.
4. Raw materials mixed with other impurities or mixed with inappropriate or excessive solvents or other additives
5. The quality of plastic itself is poor, for example, the molecular weight distribution is large, and the proportion of components with rigid molecular chain and other uneven structures is too large; Or it is contaminated by other plastics, bad additives, dust and impurities, etc
6. The product has sharp corners, notches or parts with large thickness differences that are prone to stress cracking.
There are many reasons for embrittlement of injection molding products. Equipment, mold, process, raw materials, design and other aspects may cause embrittlement of products. To avoid embrittlement, we need to check all aspects of injection molding.
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