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Cutting Device for Masking Film

IP.com Disclosure Number: IPCOM000091580D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Schmid, H: AUTHOR

Abstract

This device facilitates the cutting of transparent patterns in masking film. The latter also called cut-and-strip foil, is used in photolithography. Usual masking film consists of a clear polyester base covered with an adhesive red or blue stained layer. The desired pattern is cut out of the stained layer and peeled off.

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Cutting Device for Masking Film

This device facilitates the cutting of transparent patterns in masking film. The latter also called cut-and-strip foil, is used in photolithography. Usual masking film consists of a clear polyester base covered with an adhesive red or blue stained layer. The desired pattern is cut out of the stained layer and peeled off.

Cutting lines below 1 mm is difficult because razor blades or the usual swivel knives tend to fall into the first cut when the second cut close to the first one is being made. Peeling off the small strip is also a problem. The cutting device shown produces sharp lines at a width far below 1 mm with very high edge definition.

The inclined rake cutter knife, the thickness of which is of the desired line width, is flanged by two hold-down rolls. The knife-edge protrudes over the circumference of the rolls by the thickness of the stained film. The stained film is cut by shearing action between edge-flanges and roll-flanges. The cut out strip is simultaneously peeled of f the clear support foil. Both rake knife and rolls are mounted in a support which is interchangeably inserted into its holder on the rail of an X-Y drafting machine. For effective operation, the side flanges of the rake knife as well as both hold-down rolls are of high-quality flatness in order to provide proper shearing action.

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