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January 5, 2023
4:06 am

Precautions For Injection Molding Products

Precautions for injection molding products

The injection mold process is well controlled, and the ultimate goal is to make good molded products. What matters should be paid attention to for injection molded products?

1. No defects are allowed on the product surface: lack of material, charring, top white, white line, peak, blistering, whitening (or cracking, breaking), baking marks, wrinkles.

2. Weld line: generally, the weld line length of round perforation is not more than 5mm, and the weld line length of special-shaped perforation is less than 15mm. The weld line strength can pass the functional safety test.

3. Shrinkage: no shrinkage is allowed in the obvious part of the appearance, and slight shrinkage is allowed in the unobvious part (no dent can be felt).

4. Variant: the flatness of general small products is less than 0.3mm, and the assembly requirements shall be met if there are assembly requirements.

5. The obvious part of the appearance shall be free of air lines and material flowers, and the product shall generally be free of bubbles.

6. The geometric shape, size and accuracy of the product shall meet the requirements of the formal and effective die drawing (or 3D document). The product tolerance shall be based on the tolerance principle. The shaft size tolerance is negative, the hole size tolerance is positive, and the customer’s requirements shall prevail.

7. Product wall thickness: the average wall thickness of the product is generally required, the non average wall thickness shall meet the requirements of the drawing, and the tolerance shall be -0.1mm according to the mold characteristics.

8. Product matching: face shell and bottom shell matching: the surface misalignment is less than 0.1mm, and there shall be no scratching. The holes, shafts and surfaces with matching requirements shall be guaranteed

Do a good job of the above points, then in the injection molding process, good molded products will be naturally produced.

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