Analysis of the causes of white edges of injection molded products

Analysis of the causes of white edges of injection molded products and solutions White edges are injection defects unique to modified polyethylene and plexiglass, and most of them appear on the edge of the part near the parting surface. The white edge is an aggregate consisting of a myriad of stretch oriented molecules perpendicular to the direction of the flow and a fine distance between them. There is still a polymer linking phase in the direction of the white side, and thus the white edge is not a crack. Under appropriate heating, it is possible to cause the stretched oriented molecules to return to the natural curl state and the white edge to retreat.
Specific solutions:

(1) The production process should pay close attention to the close matching of the parting surface of the template, especially the area around the cavity, which must be under the true sufficient clamping force to avoid the longitudinal and lateral expansion.

(2) Reduce the injection pressure, time and amount of material, and reduce the orientation of the molecules.

(3) Applying an oil-based release agent to the white side of the die face, on the one hand, it is difficult to transfer heat at this position, and the high temperature time is maintained more, and on the other hand, the white edge may be suppressed.

(4) Improve the mold design. If the material with small elastic deformation is used to make the mold, the mechanical bearing capacity of the side wall and the bottom plate of the cavity is strengthened, so that it can withstand the high pressure impact during injection and the sharp rise of the working process temperature, and the higher the white edge prone area. The temperature compensation, changing the direction of the flow, makes the flow distribution in the cavity reasonable.

(5) Consider refueling.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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