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Backcoat Roughness to Reduce Interlayer Slippage

IP.com Disclosure Number: IPCOM000086628D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Prahl, ME: AUTHOR

Abstract

The figures depict magnetic tape 10 being wound onto capstan means 12. During highspeed wind, air is entrapped between adjacent layers of tape to create spacing 16 (Fig. 3a) which is positioned between adjacent layers 18 and 20 of the tape. With air film 16 positioned between layers 18 and 20 of the magnetic tape, when capstan 12 (Fig. 1) is stepped, the layers of tape do not move. Instead, layer 18 slides off layer 20 (Figs. 3a and 3b), which results in reading error.

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Backcoat Roughness to Reduce Interlayer Slippage

The figures depict magnetic tape 10 being wound onto capstan means 12. During highspeed wind, air is entrapped between adjacent layers of tape to create spacing 16 (Fig. 3a) which is positioned between adjacent layers 18 and 20 of the tape. With air film 16 positioned between layers 18 and 20 of the magnetic tape, when capstan 12 (Fig. 1) is stepped, the layers of tape do not move. Instead, layer 18 slides off layer 20 (Figs. 3a and 3b), which results in reading error.

Fig. 3b depicts the cross-sectional area of the magnetic tape, which comprises the relatively smooth front coat 22, substrate 24, and backcoat 26. A backcoat roughness (>6 mu-inch center line average) is affixed onto the backside of substrate 24. With this backcoat roughness penetrating air film 16, friction is created between layer 18 and 20, thereby reducing interlayer slippage.

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