DE7719330U1 - Transmission image - Google Patents

Description

It is known to decorate rubber and other vulcanizable materials by enclosing transfer images during vulcanization, which were printed with an ink made from a related lacquer base material, e.g. rubber solution. It is also known to weld or seal such images to one another if they are thermoplastics instead of rubber.

A disadvantage of this method is that it is difficult to position the images precisely, especially if the raw rubber or plastic surface is not self-adhesive. This is usually the case in the production process.

In addition, such transfer images consisting of a very thin plastic layer of paint, especially for rubber, have the disadvantage that they are easily vulnerable, so that damage can occur during manipulation, as a result of which the risk of rejects is considerably increased.

If the substrate starts to flow during vulcanization, the image is also warped and blurred, despite its possible adhesion to the substrate. For this reason, rubber decals have so far only been used where the rubber has already been preformed in its final shape.

All these disadvantages are eliminated by the innovation according to the invention that the color layer of the transfer image is provided with a vulcanizable or weldable pressure-sensitive adhesive layer, which, however, requires a release cover, be it as a separate separating layer, e.g. made of siliconized paper or by making the back of the images accordingly is heavily provided with a separating layer, e.g. silicone or wax. This prevents severe blocking in the stack and destruction of the image during separation.

It is known to apply pressure-sensitive adhesive to thin layers of paint and cover them (dry decals). What is new, however, are vulcanizable or wearable, self-adhesive decals, the pressure-sensitive adhesive layer of which is vulcanized or welded into place. This offers significant technical and economic advantages in processing in terms of preparation and precise placement in transmission.

In addition, there is the surprising effect that the layer of pressure-sensitive adhesive obviously acts as a protective layer and, when the printing material shows flow, absorbs the forces that would normally detach the image layer from its substrate to a high degree. Of course, as further experimentation with the surprising invention has shown, protection against bleeding without the simultaneous ability of the image to adhere before vulcanization can be achieved by a vulcanizable layer that runs independently of the colored lacquer layer, e.g. one even at low temperature Reached a lower viscosity grade than the image layer.

With the right choice of pressure-sensitive adhesive, it can also be used as a bonding agent, i.e. when it has solidified it enables a better connection between the image and the substrate surface, which would not bond so well without the agent. In the case of vulcanizable images, the protective layer can contain vulcanization accelerators, and in the case of polymerizing images, activators and bridging agents.

All these advantages open up a considerable new market for the use of pictures which can be vulcanized or welded, in which a high-quality decoration was previously impossible or very difficult.

The method is explained below with reference to the drawings:

Fig. 1 shows the fabric (1) to be decorated on which the colored image layer (3) provided with the protective layer (4), which protrudes completely or partially or not beyond the image, rests. The image layer and protective layer are printed on a substrate (2), a paper support gummed on the surface, by means of an ink consisting of heavily filled colored butyl rubber in screen printing or gravure printing. The protective layer consists of about 300 defo-masticated neoprene filled in. The surface of the fabric is unvulcanized butyl rubber. Figure 1 can also be explained by the fact that the paint layer (3) consists of a highly elastic one- or two-component base, e.g. polyurethane. In order to prevent the distortion during thermal transfer by means of pressure, the protective layer (4) made of a lacquer made of low-melting, e.g. EVA material, is chosen, which additionally improves the connection with the fabric surface (1), e.g. even made of polyurethane.

Figure 2 shows the picture layer (3), consisting of a pigmented PVC or PVC copolymer, e.g. PVC / PVA or acrylic or copolymer. The protective layer (5) is made of gellable plastic or elasticized copolymer. The use of cyanoacrylate adhesives as a protective and adhesive layer is also indicated. Hydrate cellulose, cellulose acetate, triacetate, but also polyester film or polycarbonate film are selected as the substrate. The protective layer sticks to the fabric (1). The substrate has already been partially removed.

Figure 3 shows a stack of transfer images, the substrate (2) being provided on one side with a separating layer (6), the effect of which is stronger than that of the separating layer (7) on the opposite side, which is the image layer (3) and the adhesive layer ( 4) carries. A release cover (8), which also has a separating layer (6), is shown at the end of the stack. The image layers are screen-printed using a colored rubber solution (possibly with the addition of accelerator). The adhesive layers are made of a petrol-based, printable or sprayable rubber solution of the type: smoked sheet rubber approx. 1,000 defo 100 root resins, e.g. rosin 5 zinc oxide 3 108

The solution can be activated by adding a commercial accelerator. If the accelerator is not microencapsulated, however, the shelf life of the adhesive layer is reduced. The substrates (2) are coated on both sides with glassine paper. The more repellent layer (6) is made with silicone oil or silicone derivatives, the weaker repellent layer (7) consists of less concentrated silicone oil, Fischer Trop's waxes or polyolefins.

Consulted patents:

Brit. 470 225 Brit. 549 121 Brit. 593 011

BRD 831 600 BRD 1 035 019 BRD 609 404 BRD 732 807

Frankr. 1 009 450

Claims (1)

Claim 1 (transfer image), which is connected by heat and contact or pressure to a material surface by vulcanization, polymerization, welding, sealing, wherein the substrate carrying the image surface is removed before or after the transfer or remains on the image, characterized in that, that this image has a protective layer over the ink layer, which prevents the image from running during transfer, but does not interfere with the connection between the image layer and the printing material, and possibly even promotes it. Claim 2 according to 1, characterized in that the protective layer is less viscous than the image layer or is designed so that the transfer process is less viscous at the beginning; Claim 3 according to 1 and 2, characterized in that the intermediate layer is a pressure-sensitive adhesive layer or an adhesive layer which can be activated, for example, by heat, pressure or liquid; Claim 3 according to 1 or 2, characterized in that the intermediate layer contains an activator, e.g. a vulcanizing agent or crosslinking agent, which promotes the bonding of the layers to the fabric surface; Claim 4 according to 2 to 3, characterized in that the back of the substrate has a separating layer which is in any case more effective than a possible separating layer effect on the image side of the substrate and is suitable for preventing the stacked images from blocking.