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Flexible Core for Molding Plastic Tubes

IP.com Disclosure Number: IPCOM000092181D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fields, DG: AUTHOR [+2]

Abstract

The fabrication of articles, such as tubes with complex internal geometries and, specifically, a tube with a spiral aperture or cavity, by conventional machining methods is extremely difficult. The fabrication of such articles is simplified by using a molding process with a mold having a flexible core which has a preformed shape and which is twisted into the desired spiral shape of the aperture or cavity. The mold is then filled with a molding material such as a casting resin or a foamable polymer. After curing of the molding material, the molded part is removed from the mold with the flexible core, which is removed by pulling on one end of the core. The molding material can be selected from a number of plastic materials such as epoxy and polyurethane.

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Flexible Core for Molding Plastic Tubes

The fabrication of articles, such as tubes with complex internal geometries and, specifically, a tube with a spiral aperture or cavity, by conventional machining methods is extremely difficult. The fabrication of such articles is simplified by using a molding process with a mold having a flexible core which has a preformed shape and which is twisted into the desired spiral shape of the aperture or cavity. The mold is then filled with a molding material such as a casting resin or a foamable polymer. After curing of the molding material, the molded part is removed from the mold with the flexible core, which is removed by pulling on one end of the core. The molding material can be selected from a number of plastic materials such as epoxy and polyurethane. The flexible core material can be any one of a number of elastomers or flexible polymers such as: ADIPRENE* L-100 (polyurethane) 100 parts by weight 4,4' - Methylene - bis -(2- chloroaniline) 11 parts by weight Dioctyl phthalate 30 parts by weight *Trademark of E. I. du Pont de Nemours and Co.

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