Browse Prior Art Database

IMPROVED MOLD DESIGN FOR FORMING CYLINDRICAL SUBSTRATES

IP.com Disclosure Number: IPCOM000027212D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

Discloses is an improved mold design for forming cylindrical substrates comprising a cylindrical mold for internal spin cast molding of articles having integral end cap plugs wherein the end caps do not form a right angle at points of contact with the cylindrical mold thereby providing molded cylinders with rounded and smooth internal edges.

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XEROX DISCLOSURE JOURNAL

IMPROVED MOLD DESIGN FOR FORMING CYLINDRICAL U.S. C1.315/213 SUBSTRATES Int. Cl. G03g 05/00 Eugene A. Swain

Proposed Classification

Discloses is an improved mold design for forming cylindrical substrates comprising a cylindrical mold for internal spin cast molding of articles having integral end cap plugs wherein the end caps do not form a right angle at points of contact with the cylindrical mold thereby providing molded cylinders with rounded and smooth internal edges.

In a conventional cylindrical spin casting apparatus which employs removable end cap means for retaining the liquid coating composition during spin casting, a resin meniscus forms where the end cap meets the spinning cylindrical mold at a right angle. Upon solidification, the meniscus affords a sharp circumferential interal edge, flange, or flashing on the molded cylinder or substrate. The edge or flashing must be removed prior to further processing or handling to prevent possible breakage or dislodging of the flashing which could result in contamination in subsequent process steps. A solution to the above flange forming problem is to use a mold and end caps which do not permit the formation of a sharp meniscus. Thus, for example, using instead improved end caps having a circumferential race, groove, or chamber where the end cap contacts the cylindrical mold provides molded cylindrical casts which have smooth or rounded edges which do not readily break away from the cylin...