Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1971-06-09
1976-04-13
Lusignan, Michael R.
Coating processes
With post-treatment of coating or coating material
Heating or drying
427389, 427390, 427412, 427416, B05D 302, B05D 304
Patent
active
039505782
ABSTRACT:
Coated paper is provided in sheet, roll or other physical form and shape which is water-repellent when wetted on either side but which readily disintegrates when both sides are wetted as when the entire sheet is immersed in water. The paper is preferably of toilet or facial tissue quality or water-soluble or any other type, provided it is not wet-strength grade, which readily disintegrates in water. A water-soluble grade of nonwoven fabric may also be used instead of paper. The paper is first covered with an extremely thin, (2 to about 5 pounds per ream) coating which does not appreciably penetrate into or impregnate the paper. The coating is preferably an extremely thin layer of polyethylene which serves as a hold-out coating for a subsequent water-repellent coating, preferably of wax, modified with ethyl vinyl acetate or synthetic rubbers and softeners. By flashing the polyethylene or other polymer hold-out layer with heat prior to application of the wax coating or by applying the modified wax at temperatures in the range of 185.degree. to 235.degree. F (depending on the speed of the wax coating operation) the stretch properties of the polyethylene are totally eliminated and yet the polyethylene serves as a hold-out coating for the flexible wax layer and prevents it from sinking into the tissue paper and rendering it water-insoluble and with wet strength properties. When an additional uncoated sheet of tissue paper is placed on top of the waxy insoluble coating the result is a sheet which repels water as well as the passage of bacteria and other micro-organisms on either side and maintains its strength but which, when wetted on both sides, readily disintegrates or dissolves much like an uncoated sheet of tissue paper. When wetted on one side the sheet derives its strength from the bottom layer of paper which is kept dry and strong by the water-repellent coating. The coating, itself, while flexible and virtually pin-hole free, has no stretch properties and is very weak. When both top and bottom layers of paper are wetted (as when flushed in a toilet) the entire sheet tears and disintegrates readily since there remains nothing to support the thin, weak water-insoluble coating. The sheet material is adapted for a variety of uses in the hospital, sanitary, nursing home and consumer fields and may be cut or shaped into sizes and configurations suitable for the particular intended use.
REFERENCES:
patent: 3078849 (1963-02-01), Morse
patent: 3123075 (1964-03-01), Stamberger
patent: 3196038 (1965-07-01), Schoch et al.
patent: 3251709 (1966-05-01), Bonzagni
patent: 3437509 (1969-04-01), Coisne
patent: 3476581 (1969-11-01), Weitzel et al.
patent: 3494783 (1970-02-01), Kimura et al.
patent: 3639148 (1972-02-01), Moore et al.
Keoseian Richard S.
Lusignan Michael R.
LandOfFree
Water-disintegratable sheet material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Water-disintegratable sheet material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water-disintegratable sheet material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-753376