DE2500999C2 - Embossing tape - Google Patents

Description

The invention relates to an embossing tape made of a material that brightens up when stretched beyond the yield point, in particular a white or light colored plastic, with a thickness of at least 0.05 mm.

Such an embossing band is from DE-AS 11 63 709 known The known embossing tape consists of a non-plasticizer or a maximum of 5% plasticizer and, if appropriate, polyvinyl chloride or vinyl chloride interpolymerizates containing pigments a thickness of only a few 10 μτη to 1.02 mm or more.

From US-PS 35 42 630 an embossable flat material or an embossing tape is also known, in which the plastic material which is lightened beyond the yield point when stiching is deposited with a backing layer of a plastic which does not lighten the stretch ^; st.

It has been shown that we know the well-known Embossing tapes when embossing around the embossed characters a certain halo or a ghost image arises, which blurs the boundaries of the characters and impairs their legibility

The invention is based on the object, based on the prior art, an embossing band of the type mentioned at the beginning specified type to the effect that when embossing sharply defined characters, in particular alphanumeric characters result, which are at least substantially free along the edges of the embossing zones are from a courtyard or a ghost image.

This object is achieved in the case of an embossing belt of the type specified at the outset according to the invention solved in that elastomer-modified Polymethylmelhacryla · is used as the plastic and that the Plastic firmly with an overlay with a Thickness of 0.05 to 0.15 mm made of a plastic that does not lighten when stretched.

The combination of features according to the invention, for whose individual features no protection is sought per se, has the advantage that the characters embossed in the question tape have sharply defined contours, d. H. Edges at which the lightened material practically seamlessly merges with the non-lightened material übergehi, it has been shown that the inventive Embossing tape is stable over a long period of time, which means that the brightening in the sharp defined, lightened areas is largely retained, despite the usual temperature changes. In addition, it has been shown that the embossing tape according to the invention not for embossing Tends to break in the area of the embossing points.

The invention is explained in more detail below with reference to drawings. In the drawing shows

F i g. 1 is a side view in section through a embossed part of an embossing band.

Figure 2 is a plan view of a letter appearing in is embossed on the embossing band.

F i g. 3 is a side view in section through a composite, multi-layered embossing tape.

The multilayer arrangement has a stretchable lightening effect Film, optionally a pigmented layer, when the deposit is clear or white. also a pastoral meditation view. which is pigmented. aside from that an adhesive coating and a protective layer. The laminate is in the form of large panels, ribbons of i- about 6 to 19 mm wide or similar shapes. Dip Assembly can vary widely in thickness and is generally at least 0.203 mm thick and usually does not exceed a thickness of 127 mm. Generally, the range of thickness is C. 203 to 0.508 mm. The thickness in question is a function of the Embossing tool with which the tape or film is used.

The base layer or the stretch lightenable layer has a thickness of about 0.05 to 0.152 mm. the Tensile elongation of the film material when tested in accordance with ASTM D-638 (a 6.35 mm sample. 5.08 mm / min) an elongation at break of at least about 25%.

The main part of the polymer is a methyl methacrylate polymer and a smaller but sufficient proportion of an elastomeric copolymer.

The methyl methacrylate polymer can be from about 0 to

20 monomer percent of an alkyl acrylate in which the alkyl group generally has 1 to 6 carbon atoms. The polymers have an average Viscosity molecular weight in the range of approximately

75,000 to about 250,000. The methyl methacrylate polymer can be done with an elastonier modifying agent be connected, or the elastomer modifier can be a mixture with a methyl methacrylate polymer be

An elastomer modifier for combination with the methacrylate polymer is also provided. The polymers can be crosslinked or mechanically mixed. The elastomer modification tool remains suitably an acrylate polymer with one or more other monomers. The acrylate is a Alkyl acrylate with 1 to 6 carbon atoms. Also, small amounts of about 0.1 to 2 percent monomer are used of crosslinked monomers added, d. H. Monomers that are two active, not (with each other) ! have conjugated double bonds. Such crosslinked monomers include alkylene diacrylates, alkyl methacrylates and the same. The rest of the monomers are derived from aromatic additive monomers, for example of styrene, Aikyimethacryiaten. from Hydroxyalkyl methacrylates and acrylates are of particular interest. The single ones Monomers are usually present with 0.1 to 15 Monojner%, with SiyroJ 5 to 15 percent monomer and the other monomers are 0.1 to 5 percent monomer.

The base film is attached to a stiff and strong plastic backing and is fixed to it tied together. Among the various polymers that can be used as an additive polymer are polyvinyl chloride, copolymers of vinyl chloride and vinylidene chloride, copolymers of vi

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nylon chloride and vinyl acetate. Polypropylene and the like The deposit generally has a thickness of 0.05 to 0.15 mm. mostly 0.05 to 0.10 mm.

If necessary, a colored cover layer can be applied behind the backing if the Backing layer is translucent or translucent. The thickness of the deposit is from several μm to to 25 um.

Finally, a protective layer is applied to the adhesive layer.

In the following, we refer to the drawing in detail To be received.

The embossing band 2 has a clear, transparent or translucent methacrylate basic layer . a backing layer 6. which is attached to the ground ...! .. ^ ht 4 ^{r <} . an adhesive layer 8 and a protective strip 10 which can be peeled off to expose the adhesive layer which is then attached to any carrier surface jmgektebi v. .. can ground (F i g 3} r ^"; ._ ^r> edge layer 4 is made of a elastomermodir>;. rten MethacrylaL The - ⁸ deposit layer 6 is a si <_h not weißfärbende under Deibrmierung, solid plastic layer, which is pigmented, unless a color coating is applied to the back of the backing layer. The base layer and the backing layer are connected to one another by a bonding agent.

The adhesive layer 8 is on the exposed side of the Backing layer is applied and is protected by a protective strip 10.

7 The embossing band 2 has a thickness and a width corresponding to the embossing machine in which it should be embossed Avci '<"n. It occurs lengthways, and Book. Characters or the like are sorted out. embossed on the tape at a distance from each other. By deforming the band, by Raising pieces of tape 12 over the remaining flat portion of the tape (see FIG. 1) becomes the raised portion subjected to stretching beyond the yield point in the stretch whitening methacrylic film. Of the Lightened area 16 extends to both sides relative to an imaginary center line of the raised piece of tape 12 by a relatively short length, which is a ends well at a distance from the flat band rescue part 14.

Maximum stresses on the base layer occur in the vicinity of the convex, outer bulge 18. There is practically no lightening in the region of the concave, outer surfaces 20. In the present embossing belt 2 of the lightened area is limited to the immediate vicinity of the imaginary central ⁵ "point of the raised edge-piece 12th

so that there are sharply defined, stretched, lightened characters form, for example the letter "L". like him in F i g. 2 is shown.

The following examples against an illustration of the invention.

example 1

A 0.102 mm thick base layer was produced from an elastomer-modin / ated poly-methacrylate-acrylate A 0.051 mm thick, pigmented vinyl (PVC) backing layer that does not lighten through stretching was covered with an adhesive layer, unc! the adhesive layer was made of 0.152 mm thick Polyethylene related. deductible cover ge schüt / t.

The band formed in this way had schai ic after embossing. embossed outer lines that are free of light borders was.

Example Π

A deposit sc-not from a 0.102 mm thick, by stretching not on -. !! end, solid Vinyl was firmly bonded with the same base layer as in Example I. The resulting band showed clear, sharp embossings that were free of light borders.

Example ΙΠ

A 0.102 mm thick backing layer made from a

Acrylic-butadiene-styrene type was made on an equal Base layer firmly attached as in Example I. As in Example 1, the embossments on the tape were clear, sharp ! defined and free of light borders.

Example IV

- A 0.102 mm thick deposit layer of pigmented, high impact resistance having "polystyrene has been connected to the same base layer as in Example I. The imprints of the band were also clear, sharply defined and without ': slle borders..

Example V

A base layer made of a 0.102 mm thick UV-stabilized, elastomer-modified poly-methyl methacrylate was attached to a 0.051 mm thick, pigmented layer of sturdy vinyl, which in turn was covered by an adhesive cover and a cover made of polyethylene. The imprints on this tape were also clear, sharply defined and without light borders.

1 sheet of drawings

Claims (1)

Claim: 25 OO Embossing tape made of a lightening when stretching beyond the yield point, in particular plastic that is white or light in color, with a thickness of at least 0.05 mm. characterized in that as plastic elastomer-modified polyymethylitiethac-ylate is used and that the plastic is solid with a backing layer with a thickness of 0.05 to 0.15 mm made of a plastic that does not lighten when stretched.