Cutting – Processes – With preparatory or simultaneous ancillary treatment of work
Patent
1992-09-04
1993-11-30
Phan, Hien H.
Cutting
Processes
With preparatory or simultaneous ancillary treatment of work
83 18, 83 30, 83 37, 83 72, 83171, 83175, 83286, 83346, 83368, B23D 500, B23D 710, B26F 124
Patent
active
052655067
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for fabricating a perforated film such as a slit film or the like and its apparatus, and in particular, it relates to a method for fabricating a perforated film and its apparatus in which holes are formed in a film by cutting edges of a cutter roll while a film material is passed between the cutter roll and a backing roll.
BACKGROUND ART
As this type of method and apparatus for fabricating a perforated film, Japanese Examined Patent Publication (Kokoku) No. 61-11757, for example, discloses slits formed in thermoplastic film. In such apparatus, holes are formed in a film by cutting edges of a cutter roll while a film is passed between a cutter roll and a backing roll. Cutting edges of the cutter roll are heated to a temperature above a melting start point of the thermoplastic film, and these cutting edges are pressed to the film to form slits in the film.
In the apparatus as described above, the travelling device of the film and the cutter roll are often driven by separate motors, for simplifying the mechanism. Said motors are driven in synchronization, but, upon stopping the apparatus, the travelling device of the film and the cutter roll do not stop simultaneously because there is a difference in frictional resistance and inertia between the travelling device of the film and the cutter roll. In this regard, if the cutter roll and the film stop simultaneously, the cutting edges of the cutter roll rub against the film thereby causing damage to the film, and sometimes tearing the film.
In addition, even if the travelling of the film and the rotation of the cutter roll stop simultaneously, if the film in a stopping state maintains contact with the cutter roll, the film is excessively heated by the cutting edges of cutter roll, melts and adheres to the cutter roll and the backing roll. If the film adheres to the cutter roll and the backing roll, it is necessary to clean them. Also, in the case of the backing roller made from a polymer material, as disclosed in the above described Japanese Examined Patent Publication (Kokoku) No. 61-11757, there is a problem in that the backing roll is excessively heated by the cutting edges of the cutter roll and is subjected to considerable damage, thereby making it impossible to use said roll.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the above described problems of the prior art and provide a method for fabricating a perforated film and an apparatus in which it is possible to prevent damage to a film and thermal adhesion of a film to the cutting edges and the backing roll, to thereby improve the working efficiency and reduce costs.
According to the present invention, there is provided a method for fabricating a perforated film from a film material, comprising the steps of pinching a film material between a cutter roll with cutting edges and a backing roll to press said cutting edges to the film material, driving to rotate at least one of the cutter roll and the backing roll, decelerating the speed of said one roll according to a stop command signal of an apparatus, displacing at least one of the cutter roll and the backing roll relative to the other roll so that said cutter roll is separated from the backing roll when the speed of said one roll attains a speed smaller than a predetermined speed, and completing the deceleration of said one roll.
With this arrangement, after the step of forming holes in the film, and such that at least one of the cutter roll and the backing roll is stopped, the film is forcibly separated from the cutter roll and does not contact the cutting edges of the cutter roll, and as a result, the film is not damaged, compared to when the film maintains contact with the cutting edges of the cutter roll.
Preferably, the method comprises detecting at least one of rotation speeds of the cutter roll and the backing roll and the travelling speed of the film material, comparing the detected speed with a predetermined speed close to the speed of the apparatus when s
REFERENCES:
patent: 3227854 (1966-01-01), Ramsey et al.
Aihara Kintaro
Honda Tadashi
Nippon Petrochemicals Company Limited
Phan Hien H.
Polymer Processing Research Inst. Ltd.
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