DE8021559U1 - WINDING CORE, PARTICULARLY MADE OF CARDBOARD FOR FILM COATINGS - Google Patents

Description

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Patent attorney Richard Fuchs

8700 Wuerzburg

Kantstrasse 18 528

Paul & Co. Inh. K. Kunert & Sons, New game spots

Winding cores, in particular made of cardboard for film webs

The innovation relates to a winding core, in particular made of cardboard for film webs with a thickness of less than about 20μ, preferably plastic sheeting with one end are glued to the surface of the winding core, the adhesive on the winding core prior to gluing the film web is covered by a removable protective film.

It is known (DE-GM 1 923 203) to glue the end of fabric webs to cardboard cores and for this purpose to apply the adhesive in strips to the surface of the winding core in its axial direction. The one used for this Adhesive and its application thickness may be sufficient for fastening strips of material, but are for extremely thin strips of film (with a thickness below about 20μ) not suitable. On the one hand, namely bind those previously used for the above purposes Adhesives come off too quickly, so that, for example, when the Attachment of the web end loosening and re-gluing becomes practically impossible, and on the other hand the cause relatively

Adhesive strips applied thickly prevent undesirable wrinkling in the film web, which can be transferred to numerous layers of the web. This can lead to the case that a considerable length of the web is completely unusable.

For fastening one end of fabric webs to cardboard winding cores, it is also known to use double-sided adhesive Use ribbons or strips. This fastening method in turn has the disadvantage that extremely thin film webs through Such an adhesive tape, which forms an elevation over the length of the winding core, bulged and on numerous Bodies are stretched. Here, too, the consequence is that a greater length of the film web becomes unusable.

To apply the above mentioned layers of glue or tapes To protect them from drying out, it is also known to cover them with a protective film made of silicone-soaked paper.

It is also completely unsuitable for attaching the end of an extremely thin plastic film web to a winding core finally the hot melt adhesive made known by DE-OS 29 08 341. As is well known, this only develops when heated an adhesive force, but the plastic film web would melt away.

The object of the innovation is therefore to provide an adhesive arrangement on a winding core, which the fastening of one end of film webs, preferably plastic film ]. sheets with a thickness of less than about 20μ when avoiding the above §

?! outlined defects enabled.

According to the innovation, this object is achieved in that a permanently adhesive adhesive is applied to the surface of the winding core in the axial direction or spirally continuously or intermittently in a thickness of less than about 5μ. The adhesive can be applied, for example, by spraying or rolling on, and by limiting the thickness on one. In the range of less than about 5μ, any wrinkling or bulging and thus any stretching of the film is reliably avoided. On the other hand, due to the use of a permanent adhesive, the end of the film on the \ | Correct the winding core without further ado. So that the adhesive area can be clearly seen, the adhesive is appropriately colored in a known manner.

In practice it has also proven to be useful if the permanently adhesive adhesive is more straight or spiral-shaped Strip with a width between about 10 to 30 mm is provided.

The permanently adhesive adhesive applied to the winding core at the factory is used to prevent contamination

expediently covered by a protective film made of plastic or paper, which can then be easily peeled off at the point of use can. This protection of the adhesive layer is absolutely necessary, as already due to the very thin adhesive layer thickness a small amount of soiling would be sufficient to remove the adhesive force entirely or for the most part.

The innovation is exemplified in the two enclosed models. These models are separate parts of a Core made of cardboard, on the surface of which in the axial direction a straight strip of permanent adhesive in a thickness of about 5 μ and a width of about 10 mm is applied by spraying. This permanent adhesive is covered by an easily removable colored plastic film before the winding core is used. After peeling of this plastic film can one end of a film web, e.g. a Plastic sheeting with a very small thickness can be attached simply by pressing lightly. As a permanent adhesive Adhesive is suitable for the above purposes, e.g. a dispersion pressure-sensitive adhesive based on PVAc. The models also show that the outer peripheral surface of the cores made of cardboard is smoothed and is relatively strongly compressed, so that penetration of the adhesive, which is relatively thin when sprayed, into the Cross-section of the winding core does not take place.

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In addition to plastic film webs with a very small thickness, those made of metal can also be glued to winding cores in this way while achieving the same advantages mentioned above.

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Claims (2)

Protection claims 1. Winding core, in particular made of cardboard for film webs with a thickness below about 20 μ, preferably plastic film webs, which are glued with one end to the surface of the winding core, with the prior to gluing the film web Adhesive on the winding core is covered by a removable protective film, characterized in that on the Surface of the winding core in the axial direction or spiral continuously or intermittently a permanently adhesive Adhesive is applied in a thickness below about 5 μ. 2. winding core according to claim 1, characterized in that the permanently adhesive adhesive as a straight or spiral shaped strip with a width between about 10-30 mm is provided.