METHOD OF BLOW MOLDING A FLAT CONTAINER HAVING PORTIONS WITH GREATLY VARYING WALL THICKNESSES

The flat container may be produced by extruding a molten resin to form a parison, closing the bottom of the parison, preblowing the parison such that the inner sufaces do not contact together, drafting the parison in a molten state, expanding the parison with the outer edge of the parison extending...

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Bibliographic Details
Main Authors MORISIGE, KOZO, TANAKA, HIROSI
Format Patent
LanguageEnglish
French
Published 05.04.1994
Edition5
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES
INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:The flat container may be produced by extruding a molten resin to form a parison, closing the bottom of the parison, preblowing the parison such that the inner sufaces do not contact together, drafting the parison in a molten state, expanding the parison with the outer edge of the parison extending beyond that of the cavity of a mold, pinching the expanded parison with mold to fuse the outer edge portions together along the outer edge of the cavity, and forcing a pressurized fluid into the parison pinched by the mold so that the parison is shaped in close contact with the inside surfaces of the mold cavity. This method may faciliate to manufacture the flat container even with high flatness by a simple steps.
Bibliography:Application Number: CA19890606395