Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-06-15
1998-03-10
Ahmad, Nasser
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156248, 156250, 156256, 156261, 156344, 156510, B32B 3100
Patent
active
057257132
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to paper sheets or webs with separable self-adhesive labels and in particular to a novel process for the production of such paper sheets or webs, in which, at least in the vicinity of the label, a contact adhesive and a separating paper is applied to a running paper web and the labels are punched out when the paper web passes through a punching device. Finally, the invention also relates to an apparatus for performing the process.
2. Description of the Related Art
EP-B1-175,719 discloses several processes for producing paper sheets or webs, particularly forms, with separable self-adhesive labels, which in the vicinity of the labels have an undesired, large thickness and/or in which the danger exists that, under heat and pressure action, contact adhesive will pass over and beyond the area of the labels into the surrounding marginal zone, which can lead to a sticking together.
Admittedly in the processes of EP-B1-175,719 these disadvantages are avoided. However, the labels are not completely punched out of the paper web and instead remain connected to the latter by means of weakening lines, such as e.g. perforations.
In a similar process, which is used in practice, in the vicinity of the labels initially a contact adhesive layer and separating paper portions are applied to a paper web. Only subsequently are the labels punched out, the paper web and the contact adhesive layer being punched through (wet punching through), but the separating paper on the back of the paper web is only prepunched. The labels remain fixed in the paper web, because the contact adhesive layer and the separating paper portions somewhat project over the surface of the labels on all sides. As the separating paper portions project over the contact adhesive layer on all sides, it is ensured that the contact adhesive does not pass out of the area of the separating paper and bring about a sticking together.
However, in the last-described process the prepunching is particularly problematical and difficult. The setting up and adjusting of the corresponding punching device is complicated and time-consuming and is also difficult to keep constant over a long period of time. In order to be able to carry out prepunching from the production standpoint, thicker and therefore more expensive separating papers must be used than would be necessary for the intended use per se. However, thicker separating papers more particularly lead to an increase in the overall thickness of the paper sheets or webs in the vicinity of the labels, which makes more difficult the handling thereof during stacking, reeling or inscribing.
The prepunching is made more difficult by the prior coating with the contact adhesive. The aqueous acrylic adhesive which is used in most cases wets the paper web, which leads to a reduction in the punching capacity. This can admittedly be avoided by a predrying, but the latter is expensive, energy-consuming and also endangers the flatness of the paper web. A laser printing run on the part of the customer can consequently be made more difficult or even impossible.
SUMMARY OF THE INVENTION
The main problem of the present invention is to provide a simple and economic process for producing paper sheets or webs with integrated, but completely punched out self-adhesive labels of the aforementioned type, which avoids the aforementioned disadvantages and can be performed using much thinner separating paper. In addition, an apparatus suitable for performing the process is to be provided.
Thus, in the process according to the invention the punching is a dry through punching, which is only performed on the paper web prior to the application of the contact adhesive and the separating paper. Only subsequently is the contact adhesive applied together with the separating paper to the paper web. The punched out labels, i.e. no longer connected to the paper web are fixed in the latter at their original location until this fixing is taken over by the separating paper coa
REFERENCES:
patent: 2391539 (1945-12-01), Avery
patent: 4246058 (1981-01-01), Reed
patent: 5098759 (1992-03-01), Felix
patent: 5580640 (1996-12-01), Kraft
Soviet Union Patent Document No. SU-979560, publication date Jul. 12, 1982 (Abstract).
Ahmad Nasser
Folien Fischer AG
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