Coating processes – Coating remains adhesive or is intended to be made adhesive – Pressure sensitive adhesive
Reexamination Certificate
1998-09-18
2001-03-27
Beck, Shrive (Department: 1762)
Coating processes
Coating remains adhesive or is intended to be made adhesive
Pressure sensitive adhesive
C427S208800, C427S210000, C427S261000, C427S286000, C427S289000, C427S381000, C427S382000, C427S389900, C427S391000, C427S394000, C427S395000, C427S411000
Reexamination Certificate
active
06207227
ABSTRACT:
This invention relates to cleaning articles, and to methods of making and using them. More particularly, this invention relates to cleaning articles in sheet form having a coating of tacky material on the surface, and to methods of making and using them.
Sheets with coatings of tacky material have been used for cleaning the rollers and other parts of office equipment, such as copying machines, printers, etc. For example, a piece of card stock or paper with the tacky material on its surface is passed through the rolls of a copying machine and any loose toner particles or other particles of dirt adhere to the tacky material and are lifted off of the rollers. This cleaning is done without the use of any solvents or disassembly or service calls for the machine in question. It is time-saving and is quick and efficient to use.
Special problems arise in the provision of path cleaning sheets for use in cleaning the rolls of certain heavy-usage industrial type reproduction equipment, such as microfilm machines used by express delivery companies and others to microfilm carbonless forms and the like, in which relatively large amounts of dirt and particles must be removed. For such heavy-duty use, a relatively much thicker layer of tacky material is needed.
In the past, such thick coatings of pressure-sensitive adhesive material have been applied by silk screening. However, this process is relatively slow and tends to leave relatively large globules of adhesive on the surface of the sheet to which it is applied. In addition, it tends to use substantial quantities of adhesive.
A similar problem exists with tacky cloths which are used for removing relatively large particles, such as abrasive particles, dust, lint, etc. from surfaces. In particular, such tacky cloths often are used to remove sanding grit, etc., in preparing automobile surfaces for painting in the manufacture and repainting of automobiles.
Typically, cloth material is soaked in adhesive or has adhesive sprayed or printed onto it to permeate the fibers of the cloth with a tacky material. Such methods use excessive amounts of adhesive, and the adhesive escapes onto the hands of those using the cloths, and also is rubbed off onto the surface being cleaned.
Another problem with the manufacture of paper path cleaning sheets is that processes used to make them are relatively slow and costly.
It has been proposed in the past to apply tacky materials to paper or card stock backing sheets by calendaring, painting, spraying, rolling on by pressure rollers, or forming adhesive material into a sheet and gluing it onto the backing sheet. None of these prior methods is satisfactory in solving the problems described above.
Accordingly, it is an object of the present invention to provide a cleaning article and method of manufacture and use which solves or alleviates the foregoing problems.
It is another object of the present invention to provide a process for manufacturing cleaning articles such as path cleaning sheets and tacky cloths which is faster, uses less adhesive, and produces a smooth coating which is of the appropriate thickness, without globules.
It also is an object of the invention to provide a method of using a cleaning article of the present invention in cleaning rollers in copying equipment and other such equipment.
The foregoing objects are met, in accordance with the present invention, by the provision of a process for coating paper or cloth with tacky material such as a pressure-sensitive adhesive by the use of a web upon which adhesive coatings are applied by means of a printing press.
In particular, the printing press preferably is a multi-stage color printing press in which color separations are printed at successive stations along a web, in the normal use of the printing press. In accordance with the present invention, adhesive is applied to the plates of the printing press which then lay down successive layers of adhesive, one on top of the other, to build up a relatively thick layer of adhesive which is smooth and substantially globule-free.
Preferably, heated air is used to dry the adhesive coats somewhat between stations of the printing press so as to at least partially dry one adhesive coating before the next coat is applied.
The inherently high degree of accuracy achieved by such presses in registering one printed image with respect to the others is used to accurately overlay several coats of adhesive to form thick, even, and globule-free adhesive coatings.
The foregoing and other objects and advantages of the invention are set forth in or will be apparent from the following descriptions and drawings.
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Russo Peter B.
Scott Barry M.
Barr Michael
Beck Shrive
Kramer Levin Naftalis & Frankel LLP
Neff Gregor N.
The Texwipe Company LLC
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