Browse Prior Art Database

BLOW MOLD/COMPRESSION PROCESS

IP.com Disclosure Number: IPCOM000027193D
Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 67K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a tool that will perform and deliver uniformly smooth surfaces on blow molded parts. Specifically, the tool is used to predictably manufacture toner bottles having flanged areas surrounding the opening. These areas must be as perfectly planar as possible for the effective application of adhesive seals to meet a toner bottle leakage specification.

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XEROX DISCLOSURE JOURNAL

BLOW MOLD/COMPRESSION Proposed Classification PROCESS U.S. C1.425/522
John D. Sundquist
Robert W. Dial
Donald L. Ruegg

Int. C1. B29c 49/00

Proposed is a tool that will perform and deliver uniformly smooth surfaces on blow molded parts. Specifically, the tool is used to predictably manufacture toner bottles having flanged areas surrounding the opening. These areas must be as perfectly planar as possible for the effective application of adhesive seals to meet a toner bottle leakage specification.

The smooth surface is achieved by a compression mechanism which is actuated by a pneumatic or hydraulic cylinder. The compression mechanism is suspended from the bottom of a parison head tool and the cylinder is mounted on top of a molding machine. The cylinder motion is transferred to the compression mechanism by a tube which passes through the machine blow channel.

The blow moldkompression cycle begins with the mold open and the parison of molten plastic being extruded through the head tooling. As the parison is extruded downward, its cylindrical shape surrounds the compression mechanism. When the full parison length is achieved, the mold closes, pinching the bottom of the parison together and pinching the top of the parison against the fixed portion of the compression mechanism. Pressurized air is then blown through the actuation tube (blow channel) to form the plastic against the inside of the mold cavity. At the same time, the compression mech...