Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Reexamination Certificate
1998-08-12
2001-03-13
Watkins, III, William P. (Department: 1772)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
C428S457000, C428S141000, C428S195100, C428S213000, C428S220000, C229S125010, C220S359100, C220S359300, C220S380000
Reexamination Certificate
active
06200663
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a packaging element comprised of a carrier material that is provided with a layer that carries a printed image on the side facing away from the material to be packaged, and with a coating on the side that is turned toward the material to be packaged.
2. Description of Related Art
Packaging elements of the type mentioned at the outset are used, for example, as lids for yogurt cups or as labels for the necks of bottles. In order to identify the goods, printing is applied to the packaging elements on the side facing away from the material to be packaged. Furthermore, it is known how to apply a coating in the form of a hot sealing lacquer to the side that is turned toward the goods to be packaged, for example, in the production of yogurt lids. By the application of this hot sealing lacquer, an airtight connection is formed between the yogurt cup and the lid that is capable, at the same time, of being peeled apart.
In order to manufacture these packaging elements, the carrier material, aluminum, for example, is used in the form of rolled foils, which are continually supplied with a layer of hot sealing lacquer on the side that is turned toward the material to be packaged, and with a layer that carries a printed image on the side that is turned away from the material to be packaged. In order to adapt the packaging elements to the form of the material to be packaged, appropriately shaped stamping tools are used. After the stamping process, a stack of packaging elements, such as yogurt lids, results. Due to the fact that the latter exhibit a smooth surface on both sides, problems arise in the course of removing the individual elements from stacks. The yogurt lids adhere to one another so strongly that in some instances, two or more lids are removed from the stack simultaneously.
In order to eliminate this undesired effect, the film composite has been subjected to an embossing step prior to the stamping process. By so doing, superficially rough films are produced that can be readily removed from a stack because, due to the air that is trapped between the embossed ridges, adhesion of the films to one another is prevented. The embossing process, however, has the disadvantage that the printed image is distorted, or even destroyed.
It is now the task of the invention to avoid this well-known disadvantage, while at the same time providing packaging elements that are easy to manipulate.
SUMMARY OF THE INVENTION
According to the invention, therefore, a packaging element of the type mentioned at the outset is proposed, which is characterized by the fact that the side of the packaging element that is turned toward the material to be packaged has a superficially rough coating with a depth of roughness measuring 1-100 &mgr;m.
A further advantage of the invention is that the coating is present in the form of a superficially rough imprint such that the latter is advantageously formed by means of geometrically arranged spacers.
The geometrically arranged spacers are provided on the side that is turned away from the material to be packaged, and/or on the side turned toward it; advantageously, they have a height of 1-100 &mgr;m, and preferably of 4-15 &mgr;m.
The depth of roughness of the superficially roughened coating is advantageously produced by the addition of a granular material.
The carrier material of the packaging element according to the invention advantageously consists of aluminum, paper, or plastic, where in the case of plastic, preferably one that is based upon polypropylene, polyethylene, polyamide, or polyethylene terephthalate is used. Furthermore, film composites having the following combination of materials, beginning with the goods to be packaged, can be advantageously used as carrier material: aluminum/aluminum, aluminum/plastic, plastic/aluminum, plastic/plastic, aluminum/paper, paper/aluminum, paper/paper.
Furthermore, the use of the packaging element according to the invention to produce lids for cups is proposed such that the superficially rough coating is also capable of being sealed.
A further advantage when using the packaging element according to the invention for the production of lids for cups consists of the fact that between the carrier material and the sealable superficially rough coating, an additional sealable coating is provided, the surface roughness of which is equal to 0 or nearly equal to 0.
The packaging element can also be used, according to the invention, for the production of labels for the necks of bottles.
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Observations of a Third Party, Mar. 27, 2000.
Observations of a Third Party dated May 9, 2000 including Declaration of John Kingston and Exhibits A-F.
Taschenbuch der Kunststoff-Additive,Dr. R. Gachter et al., Stabilisatoren, Hilfstoffe, Weichmacher, Fullstoffe, Verstarkungsmittel, Farbmittel.
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Nekula Lambert
Reiterer Franz
Zuser Wilhelm
Bacon & Thomas
Teich Aktiengesellschaft
Watkins III William P.
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