Coating apparatus – Solid applicator contacting work – Movably mounted applicator
Reexamination Certificate
1997-03-24
2002-12-31
Edwards, Laura (Department: 1734)
Coating apparatus
Solid applicator contacting work
Movably mounted applicator
C118S236000, C118S239000, C118S249000, C118S212000, C118S643000
Reexamination Certificate
active
06500260
ABSTRACT:
TECHNICAL FIELD
The invention relates to a method and apparatus for the application of a coating material such as pressure sensitive adhesive, to individual sheets, such as sheets of paper.
BACKGROUND OF THE INVENTION
It is desirable in some fields to apply pressure sensitive adhesive to a paper substrate and several methods are known for performing this process. German patent application 36 06 199, for example, discloses a method and apparatus for applying pressure sensitive adhesive on a continues web of paper. The web is coated with a primer, or adhesion promoter and dried in a first drying station. Next, an optional low adhesion backsize, or release layer, may be coated onto the opposite surface of the web and dried at a second drying station. Finally, a circulating intermediate carrier applies the pressure sensitive adhesive, which has been partially dried while on the intermediate carrier, over the primer layer. The paper web may then be collected and further processed as desired.
The various drying steps disclosed in the '199 patent (drying the primer layer, drying the low adhesion backsize layer, and drying the adhesive layer while on the intermediate carrier) remove moisture from the aqueous primer, backsize and adhesive materials, to prevent the paper web from curling or wrinkling. However, the sequential application and drying of the primer and low adhesion backsize layers typically result in some curling of the paper web, which is undesirable. The curling problem would be more pronounced in the context of the application of a primer, low adhesion backsize, and adhesive to individual paper sheets rather than a paper web, because the web is typically in tension whereas the individual sheets are not. Thus, the method and apparatus of the '199 patent typically is not suitable for use with individual paper sheets.
It is therefore desirable to provide a method and apparatus for applying primer, low adhesion backsize, and pressure sensitive adhesive to a plurality of individual paper sheets without inducing curling or cockling of the sheets.
SUMMARY OF THE INVENTION
The present invention includes within its scope an apparatus for applying a coating material to a plurality of sheets as the sheets are conveyed past the apparatus. The apparatus comprises means for supplying a plurality of sheets, means for overlapping the sheets, such that a minor portion of each sheet overlies a portion of an adjacent sheet, and a minor portion of each sheet underlies a portion of a second adjacent sheet, a coating station comprising means for receiving coating material from a supply of such material, and for applying the coating material to a first major surface of the overlapping sheets as the sheets are conveyed past the coating station, and means for collection the coated sheets. In one embodiment, the coating material is a pressure sensitive adhesive, and the sheets are sheets of paper.
Also provided is a method of applying a coating material to a plurality of sheets. The method comprises the steps of providing a plurality of sheets, overlapping the sheets, such that a minor portion of each sheet overlies a portion of an adjacent sheet, and that a minor portion of each sheet underlies a portion of a second adjacent sheet, providing a source of coating material, applying a coating material to a first major surface of the overlapping sheets as the sheets are conveyed past the coating station, and collecting the coated sheets. In one embodiment of the inventive method, the coating material is a pressure sensitive adhesive, and the sheets are sheets of paper. Also provided is a sheet coated with a coating material according to the foregoing method.
REFERENCES:
patent: 1781877 (1930-11-01), Levin
patent: 2060800 (1936-11-01), Ehrig et al.
patent: 2130605 (1938-09-01), Staude
patent: 2146945 (1939-02-01), Ehrig et al.
patent: 2503984 (1950-04-01), Wuko
patent: 2647463 (1953-08-01), Ferrar
patent: RE24906 (1960-12-01), Ulrich
patent: 3029731 (1962-04-01), Bussey
patent: 3121021 (1964-02-01), Copeland
patent: 3257226 (1966-06-01), Thwaites
patent: 3265556 (1966-08-01), Hungerford
patent: 3360396 (1967-12-01), Kennedy et al.
patent: 3407084 (1968-10-01), Heywood
patent: 3426754 (1969-02-01), Bierenbaum et al.
patent: 3467060 (1969-09-01), Klebanow et al.
patent: 3523846 (1970-08-01), Muller
patent: 3565728 (1971-02-01), Alton
patent: 3575134 (1971-04-01), Quint
patent: 3590452 (1971-07-01), Macleod
patent: 3607579 (1971-09-01), Enskat et al.
patent: 3645835 (1972-02-01), Hodgson
patent: 3655488 (1972-04-01), Goldstein et al.
patent: 3676184 (1972-07-01), Spearin et al.
patent: 3677788 (1972-07-01), Zirnite
patent: 3691140 (1972-09-01), Silver
patent: 3702482 (1972-11-01), Dolcoimascolo et al.
patent: 3722878 (1973-03-01), Kistner
patent: 3802952 (1974-04-01), Gurin et al.
patent: 3857731 (1974-12-01), Merrill, Jr. et al.
patent: 3861351 (1975-01-01), Bonwit et al.
patent: 3897780 (1975-08-01), Trousil
patent: 3934066 (1976-01-01), Murch
patent: 3956552 (1976-05-01), Geary
patent: 4004061 (1977-01-01), Creighton et al.
patent: 4024679 (1977-05-01), Rain et al.
patent: 4024814 (1977-05-01), Becker
patent: 4054710 (1977-10-01), Betsolas
patent: 4068615 (1978-01-01), LeNir
patent: 4112177 (1978-09-01), Salditt et al.
patent: 4163822 (1979-08-01), Walter
patent: 4165404 (1979-08-01), Quehl
patent: 4166152 (1979-08-01), Baker et al.
patent: 4193178 (1980-03-01), McArthur et al.
patent: 4202925 (1980-05-01), Dabroski
patent: 4214743 (1980-07-01), Meier
patent: 4219376 (1980-08-01), Roman
patent: 4325321 (1982-04-01), Wahnschaff
patent: 4327153 (1982-04-01), Micheron
patent: 4384544 (1983-05-01), Weishew
patent: 4397258 (1983-08-01), Dremel
patent: 4399767 (1983-08-01), Simeth
patent: 4407867 (1983-10-01), Bruck et al.
patent: 4413562 (1983-11-01), Fischer
patent: 4416392 (1983-11-01), Smith
patent: 4416448 (1983-11-01), Meirer
patent: 4427737 (1984-01-01), Cilento et al.
patent: 4442162 (1984-04-01), Kuester
patent: 4495318 (1985-01-01), Howard
patent: 4526362 (1985-07-01), Thierstein
patent: 4536012 (1985-08-01), Hume, III
patent: 4558888 (1985-12-01), Hanson et al.
patent: 4566014 (1986-01-01), Paranjpe et al.
patent: 4598112 (1986-07-01), Howard
patent: 4612074 (1986-09-01), Smith et al.
patent: 4664949 (1987-05-01), Greiner et al.
patent: 4675208 (1987-06-01), Kageyama et al.
patent: 4681035 (1987-07-01), Kobler et al.
patent: 4698110 (1987-10-01), Vassilios
patent: 4764402 (1988-08-01), Pagendarm et al.
patent: 4779557 (1988-10-01), Frazzitta
patent: 4781306 (1988-11-01), Smith
patent: 4798201 (1989-01-01), Rawlings et al.
patent: 4805552 (1989-02-01), Pagendarm et al.
patent: 4822670 (1989-04-01), Ono et al.
patent: 4883209 (1989-11-01), Hebels
patent: 4886564 (1989-12-01), Pagendarm et al.
patent: 4886680 (1989-12-01), Tindall
patent: 4904425 (1990-02-01), Hebels et al.
patent: 4961964 (1990-10-01), Dahlgren
patent: 4967740 (1990-11-01), Riedel
patent: 4973040 (1990-11-01), Kemp et al.
patent: 4973513 (1990-11-01), Riedel
patent: 5009408 (1991-04-01), Pulskamp
patent: 5029832 (1991-07-01), Orsinger et al.
patent: 5032460 (1991-07-01), Kantner et al.
patent: 5040778 (1991-08-01), Cole, Jr.
patent: 5045569 (1991-09-01), Delgado
patent: 5050909 (1991-09-01), Mertens et al.
patent: 5067699 (1991-11-01), Gadway et al.
patent: 5080254 (1992-01-01), Feer
patent: 5085167 (1992-02-01), Hebels
patent: 5143250 (1992-09-01), Freitag
patent: 5167346 (1992-12-01), Bodziak
patent: 5168639 (1992-12-01), Hebels
patent: 5179908 (1993-01-01), Hebels
patent: 5202190 (1993-04-01), Kantner et al.
patent: 5211992 (1993-05-01), Newton et al.
patent: 5212877 (1993-05-01), Onur et al.
patent: 5309839 (1994-05-01), Hartung et al.
patent: 5363985 (1994-11-01), Cornell
patent: 5378281 (1995-01-01), Kamata
patent: 5382055 (1995-01-01), Mertens et al.
patent: 5397117 (1995-03-01), Mertens
patent: 5409208 (1995-04-01), Schmid
patent: 5417345 (1995-05-01), Smith
patent: 5421259 (1995-06-01), Shiba et al.
patent: 5458926 (1995-10-01), VerMehren
patent: 5473983 (1995-12-01), Maul
patent: 5618062 (1997-04-01), Merten
Edwards Laura
Minnesota Mining and Manufacturing
Peters Carolyn V.
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