Voids are mainly manifested as cavities or bubbles inside plastic products, which may be caused by plastic not completely filling the mold cavity during the injection molding process. According to different manifestations, voids can be: Vacuum VoidsDuring the injection molding process, vacuum voids are caused by the plastic surface contacting the low-temperature mold wall during …
When the color of plastic molded parts is incorrect, it directly leads to uneven color or significant differences in color depth within a product or batch of products. This discoloration typically occurs in specific stripes on the molded product and is manifested as color differences, jetting marks, black spots, or impurities. Causes of DiscolorationThe material …
This type of defect typically manifests as numerous very small blister within the finished product, often accompanied by silver streaks. When observing the product externally, these blister typically appear as circular bright spots. For precision plastic injection molding products with waterproof performance requirements, even a tiny blister can lead to the entire product being returned …
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 …
