Stock material or miscellaneous articles – Structurally defined web or sheet
Reexamination Certificate
1999-06-21
2001-09-04
Ahmad, Nasser (Department: 1772)
Stock material or miscellaneous articles
Structurally defined web or sheet
C428S105000, C428S195100, C428S211100, C428S500000, C428S515000, C428S516000, C428S517000
Reexamination Certificate
active
06284344
ABSTRACT:
FIELD OF THE INVENTION
The invention is directed to multi-layer bias-cut films. More specifically, the present invention is directed to multi-layer bias-cut films that are produced from several layers of monoaxially oriented thermoplastic film that have been bias cut at different bias angles to change the machine direction angle in the film.
BACKGROUND OF THE INVENTION
The present invention is an improvement to a multi-layer film having two layers or four layers of bias-cut film cut at the same bias angle . A process is presently used to produce or manufacture a two layer cross laminated film from monoaxially oriented thermoplastic film. The process cuts the original monoaxially (machine direction) thermoplastic film on a ±45° bias to produce a film with the machine direction of the original film oriented to a ±45° angle, or as used herein “the machine direction angle”. Two films having the machine direction angle of 45° are then laminated to produce the two layer cross-laminated film with the machine direction angles of ±45° crossing one another. It is understood that when the machine direction angle is used herein it has reference to the machine direction of the originally produced film that has been redirected or oriented by the bias cutting of the monoaxially thermoplastic film in a direction, dependant on the angle of the bias cutting, at an angle across the bias-cut film.
The equipment used in the process of the two or four layer cross laminated film is disclosed in the section entitled Prior Art Process herein.
SUMMARY OF THE INVENTION
The present invention is directed to multi-layer films having three or more layers of bias-cut film where at least two layers have different machine direction angles. More specifically, the present invention is directed to cross laminated films with three or more bias-cut film layers each having a machine direction angle between 20° and 70°, where at least two layers have different machine direction angles.
REFERENCES:
patent: 5910353 (1999-06-01), Machlica
Amendt Charles E.
Barnes Christopher C. E.
Nimz Steven S.
Ahmad Nasser
Breh Donald J.
Croll Mark W.
Illinois Tool Works Inc.
O'Brien John P.
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