Biaxially stretch blow-molded article and bottom mold therefor

Details Biaxially stretch blow-molded article and bottom mold therefor Biaxially stretch blow-molded article and bottom mold therefor

1994-11-28

1996-04-30

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

249117, 264523, 425398, 425403, B29C 4948

Patent

active

055119662

ABSTRACT:
A bottom mold for molding a biaxially stretch blow-molded article. The bottom mold has a grounding bottom portion and a central inwardly concave dome inside of the grounding bottom portion. The central inwardly concave dome has annular flat walls at different levels from the grounding bottom portion. The annular flat walls are defined by polygons of similar figures. An angle of one of the polygons is aligned along a radial line connecting a bisected point of one side of an adjacent upper or lower polygon and the center of the central inwardly concave dome. The angles of the polygons are the highly stretched areas having a high latitudinal stretch ratio, while the sides of the polygons particularly around the center point, are the moderately stretched areas. The highly and the moderately stretched areas are alternately arranged around the central inwardly concave dome in the circumferential and radial directions.

REFERENCES:
patent: 4025275 (1977-05-01), Gournelle
patent: 4502607 (1985-03-01), Szajna
patent: 5198248 (1993-03-01), Krishnakumar et al.
patent: 5229142 (1993-07-01), Yokobayashi
patent: 5411699 (1995-05-01), Collette et al.

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