Stock material or miscellaneous articles – Layer or component removable to expose adhesive
Patent
1995-02-08
1997-12-23
Ahmad, Nasser
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
40299, 283 81, 283101, 428 417, 428 418, 428 421, 428 422, 428 423, 428 43, 428 77, 428 78, 428 79, 428192, 428220, B31D 102, G09F 302
Patent
active
057005354
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sheet of labels and a method as well as a device for its production.
Label materials are generally constructed from a non-stick substrate material, a contact adhesive and a top material. They are produced by coating the substrate material or the top material with the contact adhesive and subsequently performing a lamination with the top material and/or substrate material. The formed integrated system is subsequently rolled up, wherein the rolls are often trimmed on the side surface and are also optionally cut to narrower rolls.
First, the rolled up label material is unrolled in printing machines for the production of sheets of labels and optionally printed. Subsequently, the top material and optionally also the substrate material is stamped in a pre-determined pattern, and the stamped-out top material is pulled off as a lattice matrix. From the stamped and stripped continuous ribbon, the individual sheets of labels are finally obtained through longitudinal cuts and cross cuts and/or cross perforations and subsequent lay-up and/or folding and subsequent separation on the perforation lines.
Cutting steps are employed in the above production wherein a solid medium vertically cuts the integrated system of substrate material, contact adhesive and top material into two. Examples for the solid medium are knives rotating in the direction of motion of the web or crosswise to the direction of motion of the web, a blade fixed in the direction of motion of the web or knives oscillating in the direction of motion of the web.
In these cutting steps the problem exists that the fixed cutting medium can pull out contact adhesive particles from the cut edges. How pronounced this problem appears depends on the production speed (web running speed), the characteristics of the layer materials of the labels (for example the tendency to spray of the contact adhesive) and also the characteristics of the cutting medium (for example sharpness of the knife). These contact adhesive particles pulled out of the label material then remain on the cutting medium and adhere to the cut edges of the label material. An adhesive sticking to the cutting knife causes especially an unclean cut because it produces a rasp effect on the edges of the sheet of labels.
Sheets of labels with adhering, more or less lose contact adhesive particles and with unclean cut edges are undesirable if they are to be further processed by machine because the adhering particles are stripped by manifold contact with the corresponding machine parts and dirty the further processing equipment.
Also when the sheets of labels are processed with clean and/or smooth cut edges, the above disadvantageous effect appears--if, however, more slowly. In the further processing, the sheet of labels often stands under vertical pressure (for example in the further transport) or under the action of heat (for example by printing or through lost machine heat) whereby the contact adhesive comes out over the smooth edges and/or bleeds out and thereby comes in contact with the machine parts.
Sheets of labels with unclean cut edges have a particularly destructive effect when they are further processed and/or printed in electronic data processing printing machines such as laser, ion, magnet printers, ink jet printers, thermal and transfer printers as well as in copying and fax equipment that work according to these printing principles. Sticking contact adhesive particles adhere to the machine parts of the transport path such as for example feed rollers, separation plates and guide plates, grippers, semi-conducting drums and fixing rollers. Subsequent sheets of labels stick again to these stripped contact adhesive particles and are thus hindered in their course. The consequences are a hesitation or even a discontinuation of the transport or a deflection of the sheet of labels from the normal transport path and therewith a negative influence on the productivity of the further processing and print quality. Contact adhesive particles sticking
REFERENCES:
patent: 4246058 (1981-01-01), Reed
patent: 4281762 (1981-08-01), Hattemer
patent: 4544590 (1985-10-01), Egan
patent: 5091035 (1992-02-01), Anhauser
Galsterer Wolfgang
Schlegel Andreas
Utz Martin
Ahmad Nasser
Zweckform Buro-Produkte GmbH
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