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Print Band Character Replication

IP.com Disclosure Number: IPCOM000062659D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Payne, NG: AUTHOR

Abstract

The profile and surface configuration of the characters on the surface of a printer print band are critical and the capacity to create a cross-section replication, in a non-destructive fashion, permits a useful inspection. Current methods typically replicate the surface of the characters using a silicone rubber. The rubber, after suitable curing, is removed and used as a mold for a two-part epoxy-casting resin. This casting is then subjected to normal metallographic cross- sectioning techniques. The casting is coated with a metal before casting, or encapsulating, into another two-part epoxy resin. After the resin has been cured the replica is cross-sectioned for inspection, analysis, etc. A simplified replication procedure that works in a one-step molding is described in the following.

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Print Band Character Replication

The profile and surface configuration of the characters on the surface of a printer print band are critical and the capacity to create a cross-section replication, in a non-destructive fashion, permits a useful inspection. Current methods typically replicate the surface of the characters using a silicone rubber. The rubber, after suitable curing, is removed and used as a mold for a two-part epoxy-casting resin. This casting is then subjected to normal metallographic cross- sectioning techniques. The casting is coated with a metal before casting, or encapsulating, into another two-part epoxy resin. After the resin has been cured the replica is cross-sectioned for inspection, analysis, etc. A simplified replication procedure that works in a one-step molding is described in the following. The print band 1 is secured and the character (not shown) to be replicated is positioned in a mold cavity 2. A low shrinkage, thermosetting plastic, such as phenolic, is transfer-molded, under heat and pressure, around the characters in mold cavity 2. After a short curing cycle of three to ten minutes, the band 1 and replica are removed and the molded replica is ready for encapsulation and cross-sectioning. In addition to being considerably faster, this method has the advantage of reproducing the characters more accurately because the material has low shrinkage properties.

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