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Web Slitting Apparatus

IP.com Disclosure Number: IPCOM000074202D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Barth, HV: AUTHOR [+2]

Abstract

Each of these slitting apparatus, alone or in conjunction with a plurality of like slitting stations, is for slitting web material into narrower widths. They are useful in the production of magnetic tape from flexible web material coated with a matrix of particulate magnetic material in a polymeric binder.

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Web Slitting Apparatus

Each of these slitting apparatus, alone or in conjunction with a plurality of like slitting stations, is for slitting web material into narrower widths. They are useful in the production of magnetic tape from flexible web material coated with a matrix of particulate magnetic material in a polymeric binder.

In embodiment A, each blade 1 is cylindrical in shape and is mounted to make shearing contact with adjacent cooperating cylindrical blade 2. Blades 1 and 2 overlap slightly, to the extent that the angle alpha, formed by the tangents of the two blades at their forward edge of contact, is less than about 30 degrees, with an angle of about 10 degrees being preferred. Each of the blades has a hardness of 1500 knoop or greater. The edge portion of each cylindrical blade making contact with the adjacent blade has a radius of 0.0001 inch or less, and the flatness of the blades in the area of overlap must be 0.0001 inch or less. Each blade is composed of a single homogeneous material; although, a composite structure with only the overlapping portions of the blade having the required hardness, flatness, and sharpness is also suitable. Generally, during the slitting operation, the blades remain stationary and are not rotated.

Where the blade material is a poor conductor of heat, heat of friction builds up at the point of intersection of the blades with the web and causes deterioration of the blades. Heat deterioration problems are avoided by the ex...