Method of making blow molded plastic articles

Details Method of making blow molded plastic articles Method of making blow molded plastic articles

B - Operations, Transporting

29

C

18/509

B29C 49/16 (2006.01) B29C 49/04 (2006.01)

Patent

CA 1038582

METHOD OF MAKING BLOW MOLDED PLASTIC ARTICLES ABSTRACT A method of making blown plastic articles of non- circular cross-section, having convex exterior portions, such as a bottle of rectangular or oval shape, or having localized pro- tuberances. The article is blown from a pre-form of inverted shape, i.e., the convex article portions are formed from concave pre-form portions. Also, the concave, pre-form portions are of increased thickness to compensate for their greater subsequent expansion during blowing. During final blowing, the non-convex portions of the article are first formed against the mold cavity - thereby stabilizing the partly blown pre-form in the blow mold cavity - and the concave pre-form portions are then blown to their final convex shape to complete the article.

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