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

• Main Authors: KOZO MORISIGE, HIROSI TANAKA
• Format: Patent
• Language: English
• Published: 31.10.1996
• 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

THE FALT CONTAINER MAY BE PRODUCED BY EXTRUCING A MOLTEN RESIN TO FORM A PARISON, CLOSING THE BOTTOM OF THE PARISON, PREBLOWING THE PARISON SUCH THAT THE INNER SURFACES 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. (FIG.1)