B - Operations – Transporting – 26 – F
Patent
B - Operations, Transporting
26
F
18/1057
B26F 1/26 (2006.01) B29C 35/16 (2006.01) B29C 59/06 (2006.01)
Patent
CA 1236672
PROCESS FOR HIGH-SPEED PRODUCTION OF WEBS OF DEBOSSED AND PERFORATED THERMOPLASTIC FILM ABSTRACT The present invention provides for a process for debossing and perforating a substantially continuous web of substantially planar thermoplastic film, using a forming structure having a patterned forming surface with holes and an opposed surface. The forming structure is open from the holes in the forming surface to the opposed surface. The web of film has an indefinite length, a first surface, a second surface, and a thickness which is the distance between the first surface and the second surface. The process comprises the following steps: (a) The web of thermoplastic film is provided with its first surface proximate the forming surface of the forming structure. The forming structure moves in a direction of the length of the web of film and carries the web of film in that direction. The web of film is substantially entirely molten. (b) A fluid differential pressure is substantially continuously applied across the thickness of the web of film from a first position along the direction of movement of the forming structure to a second position. The first and second positions are fixed relative to the moving forming structure. The fluid differential pressure is sufficiently great to cause the first surface of the web of film to be urged against the forming surface and to cause perforations to be created in the web of film. Thus a web of debossed and perforated film is formed in the image of the forming surface from the web of film. The web of debossed and perforated film has a first surface and a second surface which correspond to the first surface and the second surface, respectively, of the web of film. Fluid differential pressure holds the web of debossed and perforated film against the forming surface. (c) The second surface of the web of film is contacted with a fluid having low heat transfer capacity for a period of time from when the web of film passes the first position through when the web of film is debossed and perforated. Thus, the web of film remains substantially entirely molten throughout this period of time. (d) Cooling fluid is applied to the second surface of the web of debossed and perforated film after the film is debossed and perforated and before the web of debossed and perforated film passes the second position. Thus the web of debossed and perforated film is cooled and is set by the time the web of debossed and perforated film passes the second position.
466957
Farrington Theodore E. Jr.
Koger Thurman J. II
Weinshenker Eugene
Sim & Mcburney
The Procter & Gamble Company
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