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US4035455A Method for blow molding a hollow plastic article having a concave base 失效
用于吹塑具有凹形基底的中空塑料制品的方法

Method for blow molding a hollow plastic article having a concave base
摘要:
In a blow-moulding process, the base of a hollow plastics body is formed initially of convex configuration and then a portion of the base is deformed inwardly to provide a concave area surrounded by an annular support surface. Deformation of the base is controlled in response to an increase of pressure in the mold cavity after termination of venting thereof.
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