Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1998-05-28
1999-11-16
Zirker, Daniel
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
156579, 428354, 428352, 428906, 427208, 4272084, 4272088, B05C 108, B32B 3100
Patent
active
059854391
DESCRIPTION:
BRIEF SUMMARY
The invention proceeds from a transfer web, whose upper side is coated with a first releasing agent and whose bottom side is coated with a second releasing agent, wherein the second releasing agent exhibits a significantly greater peel force than the first releasing agent, and a process for manufacturing the transfer web and a device for the use of the same.
The document DE-A-43 05 081 describes a process and a device for applying self-adhering pressure sensitive adhesive to sheets of paper or similar material, in which process the slightly overlappingly conveyed sheets are coated with a primer on the upper side and coated with a release on the bottom side and subsequently fed to a pressure sensitive adhesive application station. The overlapping has the purpose of producing a continuous stream of sheets without space between the individual sheets in order to apply the primer and release. The pressure sensitive adhesive is applied on the upper side of the sheet by means of a continuous transfer tape, on which are applied pressure sensitive strips, which extend in the direction of feed and are spaced a specified distance apart. Subsequently the sheets, coated with pressure sensitive adhesive, are stacked and cut into adhesive slips of paper of the desired size.
This process has the drawback that a relatively complicated and thus expensive machine is required to carry out said process, so that its procurement is out of the question for many operations. The handling of the pressure sensitive adhesive requires the employment of trained and experienced specialists.
Therefore, the object of the invention is to design the process, described in the introductory part, in such a manner that it can be realized inexpensively.
The aforementioned transfer web provides, according to the invention, that the first releasing agent is coated with a self-adhering pressure sensitive adhesive in the form of an aqueous dispersion of a bead polymerizate in order to transfer the pressure sensitive adhesive to sheets of paper or the like material. Thus, the transfer web can be coated with pressure sensitive adhesive at the central place and made transportable together with the pressure sensitive adhesive applied to it. Thus, anyone, who wants to coat his/her sheets of paper with pressure sensitive adhesive, is relieved of the problem of having to produce the transfer tape coated with pressure sensitive adhesive, which he/her can acquire ready-to-use from the central place. Thus there is no longer any need for personnel experienced with the handling of pressure sensitive adhesive; and a device for the transfer of pressure sensitive adhesive from the transfer web to the sheets of paper becomes significantly simpler and less expensive.
If the transfer web is provided with a first silicone-based releasing agent, it is recommended that a starch-based thickening agent and optionally also a wetting agent be added to the dispersion prior to coating. Expedient configurations of the transfer web coated with pressure sensitive adhesive are disclosed in the dependent claims.
The aforementioned transfer web can be manufactured in a simple manner in that the first releasing agent is coated with self-adhering pressure sensitive adhesive in the form of an aqueous dispersion of a bead polymerizate in order to transfer the pressure sensitive adhesive to sheets of paper or the like material. It is recommended that a starch-based thickening agent and optionally a wetting agent be added to the dispersion prior to coating.
A device for using the transfer web of the invention provides a first storage device for the rotatable holding of a supply roll comprising the transfer web, coated with pressure sensitive adhesive; a transfer section with pressure and counter-pressure roller; and a second storage device for receiving a sleeve for the rewinding of the transfer web, which is rolled up on a roll, and a sheet feeding device. Therefore, the storage devices can be arranged above or below the sheet feeding device.
When the sheets are fed so as to be shingled
REFERENCES:
patent: 3691140 (1972-09-01), Silver
patent: 5348793 (1994-09-01), Stettner
patent: 5380395 (1995-01-01), Uchida
patent: 5514435 (1996-05-01), Suzuki et al.
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