Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
Reexamination Certificate
1999-04-02
2001-07-03
Crispino, Richard (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work feeding or handling means
C156S498000, C156S555000, C361S212000
Reexamination Certificate
active
06253821
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates, in general, to laminators used for covering both sides of an object sheet with two sheets of protective film and, more particularly, to a device for eliminating static electricity from the protective film of laminated sheets using an air current in such a laminator, thus allowing the laminated sheets to be smoothly discharged from the laminator without undesirably sticking to a frame around the sheet outlet of the laminator due to the static electricity.
2. Description of the Prior Art
As well known to those skilled in the art, a laminator, used for covering both sides of an object sheet with protective film, typically comprises two film rolls respectively installed at the upper and lower portions of a main body. An object sheet, which is to be covered with protective film at both sides thereof, is positioned at the sheet inlet of the main body prior to starting the laminator. When the laminator is started, the object sheet moves along a sheet passage extending from the inlet to a sheet outlet in the laminator. In such a case, two sheets of protective film, fed from the two film rolls, respectively pass over upper and lower heating rollers, so that the film is appropriately heated and laminated on both sides of the object sheet moving along the sheet passage. The laminated sheet, covered with the two sheets of film at both sides thereof, is finally discharged from the main body through the sheet outlet.
However, such a typical laminator is problematic in that static electricity is thermally induced on the protective film during the process of heating the film and is maintained on the laminated sheet for a period of time, so that the laminated sheet may fail to be smoothly discharged from the laminator, but may undesirably stick to a frame of the laminator at a position around the sheet outlet due to such static electricity. In addition, the protective film is heated to a high temperature during the heating process, so that the film may crumple easily, in which case the quality of the laminated sheets is reduced.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a device, which eliminates static electricity from the protective film of a laminated sheet using an air current formed by a longitudinal fan in a laminator, thus allowing the laminated sheets to be smoothly discharged from the laminator without undesirably sticking to a frame around the sheet outlet of the laminator due to the static electricity, and which effectively reduces the temperature of the film, thus allowing the film to maintain a desired flatness.
In order to accomplish the above object, the present invention provides a device for eliminating static electricity from protective film of a laminated sheet in a laminator, comprising: a longitudinal fan set in the laminator so as to generate a pressurized air current; an air suction port provided on a bottom wall of the laminator by perforating the bottom wall at a position around the fan, thus guiding atmospheric air to the fan; an air passage provided in the laminator so as to guide the pressurized air current from the fan to a rear wall of the laminator; and an air exhaust port provided on the rear wall of the laminator by perforating the rear wall at a position around a rear end of the air passage, thus discharging the pressurized air current from the laminator into the atmosphere.
REFERENCES:
patent: 3738897 (1973-06-01), Bianchini et al.
patent: 5571368 (1996-11-01), Barge
patent: 5649261 (1997-07-01), Schlickhoff et al.
Crispino Richard
GMP Co., Ltd.
Harrison & Egbert
Purvis Sue A.
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