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A - traction
in the course of injection molding and cooling, the plastic bag outside the core and volume contraction. To disconnect power to win shrinkage and friction.
The formula for calculating traction:
F = Pacos (f - tanα) / (1 + f sinα1 cosα1)
Of which:
- p: shrinkage stress of plastic products. Plastic products are cooled in a mold and cooled to 19.6 MPa 39.2 MPa outer mold
- A: surface area of the core enclosed by plastic products (m2)
- α1: mold drainage angle
- F: traction (N) . Bending force of closing the skewer: Fb = F / cos α (where: α is the angle of the bottom oblique)
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