DE1919448A1 - Process for the production of colors on weld seams or zones of plastic foils - Google Patents

Description

Pelton tir. vj B 1 te
Dr. in"?. A. v.sn d ^ r "

F / ederico Rota

Via Rezia, 8, Milan Italy

Process for producing colorations on weld seams or- zones of plastic films.

Priority: April 20, 1968, Italy No.

15552 A / 68

The invention relates to a * method for the production of colored edges, lines or zones during the welding of plastic foils, especially in the production of bags, pouches, pouches and protective covers for paper sheets, notebooks, catalogs, entry books, plastic covers and the like ₀

So far, in order to achieve this coloring of the edges and the welding zones of plastic foils, a sheet or additional tape or strip of colored plastic was used together with the foils, which was welded together with the foils «, ■

The protruding part of the tape or strip or sheet was then torn off from the welding point. For this it was necessary to use a perforated steel to protect the electrode that came into contact with the tape or sheet to provide, which along the weld line formed a tear-off groove, along which lead ■

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could tear off the transferring part.

In addition to the need to design the electrodes accordingly, this also gives rise to further aids. The tear-off process, which is already quite delicate in itself, increased the cost of the objects so welded considerably.

It also happened that small changes in the welding time or temperature resulted in a tear line that was too deep, which often even damaged the welded foils. On the other hand, this could not be sufficiently deep, so that the demolition became more difficult. In both cases there was considerable waste, which made production very expensive, _etc.

The invention was based on the object of creating a method which considerably simplifies the coloring of the edges or welding zones, while avoiding the above-mentioned inconveniences _o

The method according to the invention consists in that under or over those to be welded, one on top of the other Foils are a carrier that does not melt at the melting temperature and corresponds to that of the weld seam or zone the places a spread of a lacquer that melts at the welding temperature is arranged, the Welding between two electrodes is carried out in the usual way and after the welding process, the welding process The object is lifted from the carrier that has become free of paint along the outside of the foils to be welded Varnish on, which has the property of working with the plastic material at the prevailing welding temperatures merge and merge in it, since this lacquer is applied to a corresponding carrier that is not of the welding is affected »

The wearer should not melt at the viewing temperature. As such, a strip of cellulose acetate can be used

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z «Bc a punched tape is used which is not from the electrodes: melted because it is insulated by the paint itself.

A lacquer that melts at the viewing temperature is used, preferably a type known in the trade as "enamel lacquer" which is currently the welding process easily detaches from its wearer.

To do the welding, you put it too welded

foils end on top of each other and above the welding zone or line the carrier is brought with the varnish. Welding is then carried out in the usual way between two electrodes. To demxltatctlit £ § £ »The wearer does not need to tear away any accidental damage but can easily be lifted off and is then perfect at the StelleySer weld seam paint-free.

This is illustrated by a non-limiting example, with reference to the drawings, which represent:

Fig. 1 schematically shows the arrangement of the superimposed Parts shortly before the welding process, FIG. 2, an object immediately after the welding process

According to these figures, two foils to be welded are ; Lines 1 and 2 placed one on top of the other between two electrodes 3 and 4 in a manner known per se, the foils lengthways to weld one of their edges. A strip 5 is placed on the surface of the lower electrode 4 is provided with a spread of enamel paint. The position of the strip 5 is such that it is brought together of the electrodes on the edges to be welded; .

When reaching the visual temperature, which is between 80 ° and can fluctuate 120 °, the paint melts and comes off the 'Strip 5 off and combine with the plastic material of the Foils 1 and 2, which has also melted in the meantime,

9098A6 / .0 96

while the strip 5 does not melt because it is through the Lacquer itself is insulated.

The strip is preferably a conventional strip made of cellulose acetate, e.g. a punched tape, that is to say of practical use insignificant cost.

As soon as the welding has been carried out and the upper elec-

trode 3 has lifted off, the welded object (Pig.2) can be removed and the strip from the lower one Electrode removed because e0 "neither with the object is still glued to the electrode.

The welding can and can be of any type Letters, numbers, inscriptions or images relate to which Pall dee strip 5 is of such dimensions, that these letters, numbers, inscriptions or images are covered by it.

The invention is not limited to the example described above, but includes all additions and variants, which arise in the practical implementation for the expert.

909846/0966

Claims (1)

PATENT CLAIMS rli Process for producing colorations on weld seams or - zones of plastic films, characterized in that under or over the to be welded, overlapping foils a carrier that does not melt at the melting temperature, the one corresponding to the weld seam or zone Make a spread of a lacquer that melts at the welding temperature door carries, arranged, the weld carried out in the usual way between two electrodes and the welded object after the welding has ended is lifted from the lacquer-free carrier. Method according to claim 1, characterized in that g e k e η η ζ e i c_h net that an enamel varnish is used as varnish β Method according to claim "1, characterized in that g e k e η η ζ eidih net that a normal strip as a carrier for the paint made of cellulose acetate is used « 90 9 8A6 / Q96S & ■. Blank page