External impurities or contaminants being introduced into the mold and embedded into the plastic part can result in the presence of impurities inside the plastic part, which is a common quality issue in the injection molding process. These contaminants may originate from particles on the tool surface, material contaminants or foreign object fragments in the …
This defect is mainly characterized by excessive force on the plastic part during ejection, resulting in prominent white marks on the ejection area of the plastic product, possibly accompanied by frost-like fine cracks. Ejector mark issues typically occur on the surface of the plastic injection molding part, especially where the ejector pin is located on …
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The most difficult problem to solve in the design and production of plastic parts injection molding is the warpage. Causes: (1)Mold structure: pouring, cooling system and ejection system (2) Product structure: plastic parts wall thickness changes, with curved or asymmetrical geometry, ribs and BOSS column design is not reasonable (3) Production process: the plastic parts …
The weld lines in Plastic Injection Molding refer to the surface defect caused by the two streams being welded together. Causes: If there are holes, inserts, or multi-gate injection molding methods in the fabricated parts or the wall thickness of the parts is uneven, weld lines may be generated. Remedies: Material: Increase the fluidity of …
Sink Marks in Plastic Injection Molding is a phenomenon in which the surface of the part is concave at the wall thickness. Causes: (1) Injection pressure or holding pressure is too low (2) The holding time or cooling time is too short (3) Melt temperature or mold temperature is too high (4) Improper design of …
Streaks in Injection Molding are those in which water, air, or char is distributed in the direction of flow along the surface of the part. Causes: (1) The moisture content in the raw materials is too high (2) Air is trapped in the raw material (3) Polymer degradation: the material is contaminated, barrel temperature is …
Flow lines are molding defects that are wavy on the surface of the product known as a kind of frog jump caused by the slow flow of the melt. Causes: (1)Mold temperature and the material temperature is too low (2) Injection speed and pressure are too slow (3) The size of the flow channel and …
A spray trace is caused by the melt flowing too fast in plastic injection molding, generally serpentine. Causes: (1) The gate size is too small, and it is facing the product surface with a large cross-sectional area (2) Filling speed is too fast Remedies: Mold design: (1) Increase the gate size (2) Change the side …
It refers to the surface of the part that can be peeled off layer by layer. Causes: (1) Mixing other incompatible polymers (2) Excessive release agent used during molding (3) resin temperature is inconsistent (4) Excessive moisture (5) The gate and the flow path have sharp angles Remedies: Material: Avoid incompatible impurities or contaminated recycled …
