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US 4,060,441 AGranted
Method for forming a transparent protective coating on a photograph or the like
AssigneeRicoh Company, Ltd.
InventorsWasaburo Ohta, Tatsuya Watanabe
Life of this patent
Estimating the term…
Abstract
A releasing layer is formed on a heat resistant backing sheet and a transparent thermal bonding layer is formed on top of the releasing layer to provide a coating material. The sheet of material such as photograph is mated with the coating material. When the sheet material is a photograph its emulsion side contacts the bonding layer and is passed through a heated roller assembly to bond the bonding layer to the photograph. The backing sheet and the releasing layer are then separated from the sheet material or photograph and bonding layer.
Claims26
A method of forming a protective coating on a sheet material, comprising the steps of:
- a. preparing a coating material by forming a releasing layer on a heat resistant backing sheet and then releasably adhering a transparent thermal bonding layer onto the releasing layer, the bonding layer comprising a material selected from the group consisting of vinyl choloride, vinyl acetate and polyamide;
- b. maintaining the coating material in a state of tension;
- c. placing the sheet material and the coating material together so that the bonding layer is in face-to-face contact with the sheet material;
- d. applying heat and pressure to bond the bonding layer to the sheet meterial;
- and
- e. separating both the backing sheet and the releasing layer from the bonding layer so that the bonding layer remains bonded to the sheet material to constitute the protective coating, said separating step (e) comprising applying a force to said coated sheet material in a direction perpendicular to the general plane of said coated sheet material, said force being applied to the said coated sheet material at a location just preceding the actual separation of the backing sheet and release layer from the bonding layer, whereby said applied force facilitates separation of said backing sheet and release layer from said bonding layer.
3 more elements
A method of forming a protective coating on a sheet material, comprising the steps of:
- a. preparing a coating material by forming a releasing layer on a heat resistant backing sheet and then releasably adhering a transparent thermal bonding layer onto the releasing layer, the bonding layer comprising a material selected from the group consisting of vinyl chloride, vinyl acetate and polyamide;
- b. maintaining the coating material in a state of tension;
- c. placing the sheet material and the coating material together so that the bonding layer is in face-to-face contact with the sheet material;
- d. applying heat and pressure to bond the bonding layer to the sheet material;
- and
- e. separating both the backing sheet and the releasing layer from the bonding layer so that the bonding layer remains bonded to the sheet material to constitute the protective coating, said releasing layer comprising a material selected from the group consisting of silicone resin and acrylic resin, said coating material being maintained in a state of tension by providing the coating material with spaced sprocket holes and passing the coating material over rollers having sprocket wheels with sprockets engaging said sprocket holes, said separating step (e) being effected by passing said backing sheet and release layer along an arcuate path by passing at least partially about one of said rollers having sprocket wheels, and applying a force normal to the general plane of said coated sheet material just before said backing sheet and release layer pass over said one roller such that said normal force applied to said coated sheet material tends to maintain a generally straight line path of travel for said coated sheet material as said release layer travels along said arcuate path over said one roller, whereby said applied normal force facilitates separation of said backing sheet and release layer from said bonding layer.
3 more elements
A method of forming a protective coating on a sheet material, comprising the steps of:
- a. preparing a coating material by forming a releasing layer on a heat resistant backing sheet and then releasably adhering a transparent thermal bonding layer onto the releasing layer, the bonding layer comprising a material selected from the group consisting of vinyl chloride, vinyl acetate and polyamide;
- b. maintaining the coating material in a state of tension;
- c. placing the sheet material and the coating material together so that the bonding layer is in face-to-face contact with the sheet material;
- d. applying heat and pressure to bond the bonding layer to the sheet material;
- and
- e. separating both the backing sheet and the releasing layer from the bonding layer so that the bonding layer remains bonded to the sheet material to constitute the protective coating, said sheet material on which the protective coating is applied comprising cards and said backing sheet being an elongated web, said cards being fed and placed into face-to-face contact with said coating material intermittently, and applying said heat and pressure intermittently in synchronism with feeding of said cards.
3 more elements
Dependencies are inferred from the claim text.