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US 4,358,979 AGranted
Apparatus for cutting plastic film
AssigneeExxon Research & Engineering Co.
InventorWerner Kurzbuch
Life of this patent
Estimating the term…
Abstract
Apparatus for cutting plastic film having a serrated chromium plated cutting blade and a readily penetrable film back-up member, preferably balsa wood, aligned with the cutting blade. The back-up member has grooves formed therein by the penetrating action of the blade.
Claims11
Apparatus for perforating plastic film which comprises:
- a metal blade having an elongate serrated cutting edge;
- means for reciprocating the blade through a cutting cycle;
- a readily penetrable back-up member aligned with cutting blade and having a surface for supporting film thereon and grooves formed therein particularly shaped to receive the serrated cutting edge in close conformity, said grooves being formed by reciprocating said blade through a sufficient number of cycles to permanently shape the grooves in said back-up member by penetration of said blade to a substantial depth;
- whereby reciprocation of said blade through a cutting cycle causes the blade to penetrate film supported on said support surface, to enter said particularly shaped grooves, and to return to a retracted position.
1 more element
Apparatus for perforating plastic film which comprises:
- a serrated metal blade having an elongate serrated cutting edge having a Rockwell hardness of at least C 50, said blade being reciprocable from a retracted position through a cutting stroke;
- and
- a soft wood back-up member aligned with the blade for supporting plastic film thereon during the cutting stroke, said back-up member being readily penetrable and deformable by said blade and being sufficiently rigid to provide substantially unyielding support for the film during blade penetration thereof and having grooves of a substantial depth formed therein for receiving the blade by the action of blade penetration thereof.
Dependencies are inferred from the claim text.