Deformation and dimension change by warpage are a problem of PBT resin molded product

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Issue Time: Aug 10,2020

Summary

Deformation and dimension change by warpage are often being a problem of PBT resin molded product.

Following factors are the cause of the warpage deformation, but actually it will happen when several factors

overlap intricately.

Deformation and dimension change by warpage are a problem of PBT resin molded product

Countermeasure Against Molded Product Wapage Deformation

Cause of deformation (warpage)

Deformation and dimension change by warpage are often being a problem of PBT resin molded product. Following factors are the cause of the warpage deformation, but actually it will happen when several factors overlap intricately

【 Cause of warpage deformation 】

① Design ・ Lack of shape stiffness

・ Uneven thickness

・ Shape asymmetric property

② Material property ・ Crystalline

・ Anisotropy

・ Lack of material stiffness

③ Molding process ・ Resin and filling material orientation

・ Uneven inner pressure

・ Uneven cooling speed (mold temperature)

・ Shrinkage restriction by mold core

④ Fabricating ・ Thermal process （printing paint, adhesive setting process）

・ Aftercontraction

・ After processing， After insert

⑤ Usage environment ・ High and low temperature atmosphere

・ Creep

Following indicate examples of countermeasure against deformation for relatively simple shaped molded

products. Calculation made by CAE simulation is now getting discussed for complex shaped molded products.