Injection Molding Defects And Solutions -- Stains

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Injection Molding Defects and Solutions -- Stains 2025-10-20

Stains, Impurities, and Foreign Substances
The plastic material is impure or contaminated.

23.1 Causes	23.2 Solutions
23.1.1 Raw materials, pellets, or pigments are impure.	23.2.1 Replace the raw materials, dyes, or pigments.
23.1.2 The plastic has decomposed or deteriorated.	23.2.2 Adjust the processing conditions to prevent material decomposition.
23.1.3 The barrel and hopper are not clean.	23.2.3 Clean the barrel, hopper, and feeding tube.
23.1.4 Foreign substances mixed in during preheating.	23.2.4 Prevent foreign substances from entering during drying or material storage.