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Browse Prior Art Database

Application of Foil Tape for Head Disk Assembly Sealability/ Conductivity

IP.com Disclosure Number: IPCOM000108342D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 89K

Publishing Venue

IBM

Related People

Bungert, LC: AUTHOR [+4]

Abstract

A technique for applying foil laminated tape to a disk drive cover seal is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 57% of the total text.

Application of Foil Tape for Head Disk Assembly Sealability/ Conductivity

       A technique for applying foil laminated tape to a disk
drive cover seal is disclosed.

      Mechanically, tape can be applied reliably by first rolling the
width with an evenly distributed force at the cover/base juncture
with the tape in tension.  This technique forces out air pockets
which tend to get trapped in the planar areas, forms the metallic
tape over the non-planar geometry, and forces the adhesive to bond to
the casting and cover.  The second set of rollers applies equal high
force concentrations linearly along the two edges of the tape where
sealing is critical and the cover/base geometry is more planar.  The
seal is achieved by forcing the adhesive to flow into the cover/base
surface porosity.  These crimp rollers also flatten the metallic foil
in kinked or wrinkled areas caused by the non-planar geometry.
Metallic tape to cover/base conductivity is achieved in a similar
manner by the two types of rollers.

      Metallic foil and adhesive thicknesses are also critical to
application and performance.  Thin foil tears easily, too thick is
not malleable enough for effective crimping.  Adhesive which is thin
inhibits sealability and too thick violates the form factor.

      Fig. 1 is an isometric view of a disk drive showing the tape
being applied by rollers.  Fig. 2 shows the disk drive end view and
the relative movement of the file, rollers and tape during
...