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Product Design / Points in design

Contents Introduction Safety Molding Machines Molding Conditions Recycling
Molding Characteristics Product Design Mold Design Countermeasures for Defects

Points  Accuracy  Deformation  Dimension Control  Strength of Molded Products

List of DURACON® POM grades This page's PDF(0.97MB)

7. Product Design

7.1 Points in design

 

  • Uniform wall thickness
    Uniform wall thickness solves the problem of uneven mold shrinkage stemming from difference in wall thickness. To eliminate uneven shrinkage due to uneven wall thickness, strive for uniform thickness and make the core as large as possible. Small cores increase heat and cause longer molding cycles.
  • Thin wall thickness
    Products should be designed to have thin wall thickness in the range that causes no problem in product functions. Thin wall thickness is advantageous for the molding cycle.
  • Symmetrical shape
    Employ symmetrical shape as much as possible to balance mold shrinkage inside product. Uneven mold shrinkage causes deformations of products like warpage. For instance, in the case of product having circumference rib, rib acts as a strut. Since it causes uneven mold shrinkage. In the case of product having deep core inside, large temperature difference occurs between the stationary platen and the movable platen. Since it causes uneven mold shrinkage too.
  • Reinforcement by ribs
    Warpage cannot be avoided in some product configurations. In these cases, reinforcement ribs are used to prevent tilt and warpage. Rib thickness is set from 1/3 to 1/2 of product base.

 


Points  Accuracy  Deformation  Dimension Control  Strength of Molded Products

Contents Introduction Safety Molding Machines Molding Conditions Recycling
Molding Characteristics Product Design Mold Design Countermeasures for Defects