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Plastic Parts Design Avoidance Points

Release time:

2023-06-09

The rationality of the structural design of plastic parts is closely related to the quality, clarity and molding difficulty of the skin pattern. Drawing on industry design experience, for the two typical interior injection molding materials PP and ABS, the depth of the skin texture for the plastic parts of the mold pull-out angle requirements are different:

The mold pulling angle of the part and the depth of skin pattern processing directly affects the demolding performance of the part.

General plastic parts of the mold pulling angle needs to be defined in more than 0.5 °, but for the decorative parts with skin texture, the conventional experience is that the depth of 13μm skin texture requirements for the mold pulling angle of 1 °, for example, the door guard body selection of 110μm corrosion of the skin texture, then you need to request the pre-design of the mold pulling angle of about 8 °.

But the theoretical value must be combined with the actual situation, some surfaces if you can not make a larger slope, this piece of area of the skin pattern can be used accordingly to do shallow processing. Depending on the molding conditions, materials, wall thickness of the part and the upright height of the part and other factors, the ratio of the depth of the skin pattern and the angle of pull-out will be different. If the pull-out angle is small and the grain is too deep, it may cause undesirable phenomena such as stagnation or whitening when the part is released from the mold.

Commonly used depth range of grain:

① fine grain, grain depth of 0-80μm;

② sparkles, leather depth of 20 a 40μm, than the same depth of fine leather, more delicate and soft; ③ brushed pattern, leather depth of 20 a 40μm, more delicate and soft; ① the depth of 0 a 80μm, leather depth of 0 a 80μm

(iii) brushed pattern, leather depth of 20-80μm; (iv) coarse leather and geometric pattern.

(iv) Coarse leather grain and geometric grain, the depth of leather grain is 100-150μm.