FI86270C - FRAMEWORK FOR FRAMSTAELLNING AV EN RELIEF. - Google Patents

Description

) 1 86270

Method for making an embossing

The invention relates to a method for producing an embossing, in which an elastic filling material is applied to a body-forming material body, the body and the filling material are covered with a surface layer, after which heat sealing is performed using a printing element having the desired image.

10 Such methods are commonly used, for example, in the manufacture of so-called hard plastic folders and plastic covers. Instead of the surface layer formed of glossy plastic or pile plastic being sealed directly to the frame, for example a cardboard sheet, an elastic filling material is applied between them to provide a certain softness and to facilitate the printing of any characters or other patterns. The softness beautifies the appearance of the folder or lid and makes it more comfortable to handle. Letters and patterns can be used to indicate the intended use of the product or, for example, to convey a particular message, and also for purely decorative purposes.

:. ·. However, the known methods have their limitations.

·: * ·: The profile depth of the characters and patterns when viewed in the cross-sectional direction of the product remains quite inconspicuous ____ :. . said depth generally being on the order of one millimeter, ·; · * · meter. Thus, in practice, no appreciable variation in profile depth can be induced, e.g. * for different characters or for different points in the • • · · · * · 30 patterns.

It is an object of the present invention to provide a method which avoids the above-mentioned limitations and * · · *. which enables, for example, a much wider implementation of characters and images in a simple manner. This object is achieved by the method according to the invention, characterized in that the elastic filling material is formed of at least one body-side layer of closed-cell plastic and at least one layer of open-cell plastic 5 superimposed thereon, whereby and based on the depth of the image in the weight element.

The invention is based on the realization that the combined properties of open-cell plastic and closed-cell plastic can be utilized in connection with heat sealing to achieve a clearly perceptible three-dimensionality, especially in the case of characters and patterns formed on plastic folders or covers. This contributes significantly to the styling possibilities of the 15 characters and to the naturalness of the patterned motifs. The possibilities of using the products thus manufactured can be expanded and the visual effect achieved by the clearly perceptible three-dimensionality can be improved.

The following describes the method according to the invention by means of an example. In this connection, reference is also made to the figures in the accompanying drawing.

Figure 1 schematically shows how the materials to be used are heat sealed in a sealing device. 25, and Fig. 2 illustrates a so-called profile depth in the cross-sectional direction of the finished product.

• In Fig. 1, the printing substrate of a so-called high-frequency • 30 sealant (27 MHz) connected to a so-called industrial channel, especially used in the plastics industry, is indicated by the reference numeral: 7. The reference numeral 5 indicates a printing element or plate of Fig. 6 to be manufactured. According to the method of the invention, the desired embossing on the product in question, for example a plastic folder or cover: 35 is made by placing a layer 2 of closed cell plastic about 1-1.5 mm thick on the substrate 7 of the high frequency sealer, i.e. the thermal sealing device. make a lid which is soft throughout and has clearly elevated letters or numbers or patterns at certain points, the procedure being as follows. In order to provide softness, a thin layer of open-cell plastic 3 is first placed on the layer 2 of closed-cell plastic. Thus, these open-cell foam layers will fill the "mold recesses" of the characters or patterns in the printing element 5, i.e. the plate engravings, when the heat sealing is performed. The desired outer surface 15 of the product is obtained by covering the above-described arrangement with a surface layer 4, for example fluff plastic, before performing heat sealing.

The above-mentioned plate engravings are formed on the printing plate 5 by methods well known to a person skilled in the art, which are thus not considered necessary to describe in more detail in this connection. The same applies to the actual heat seal, which is a technical ankle known per se in the art.

. When applying the method according to the invention, there is a pro-; The felt depth was obtained between about 0.1 and 10 mm, with a pre-temperature of about 40-90 ° C. It is clear that different. With the plastics, the temperature and the high cycle frequency can affect the resulting profile depth. However, the combination of the properties of the closed cell plastic and the open cell plastic is essential.

• * · * · ·: ::: 30 Figure 2 shows a cross-section of the manufactured product to illustrate the profile depth h.

4,86270

An example of a preferred manufacturing method is the following:

A variety of PVC-based plastics are selected. An open-cell plastic that melts with a high-cycle heater or its strips is placed on top of the closed-cell plastic sheet at approximately the points where the co-patterning takes place, depending on the desired profile depth. The remainder of the PVC plastic, known as the lid, is placed on top of the open-cell foam and the closed-cell plastic. The assembly thus formed is transferred to a large-cycle heater. Preheat for a few 10 seconds. Put on a large section. The time depends on the temperature, the profile depth, the plastic grades, etc. During heat sealing, the open-cell plastic melts in those parts where it is too much, i. the profile depth has little or no engraving and thus retains its shape at least in part at those points where the profile depth is high and at the same time the closed-cell plastics weld to each other at those points without engraving. The air discharged from the open cell plastic layer is directed to the embossed space. After sealing, allow to cool for a while in the residual heat. After this, the product is ready to be used, for example, as a cover decoration. It retains its shape compared to, for example, a product obtained by the deep-drawing method. The pattern returns to its shape after pressing.

It is also possible that, especially in the smaller figures, • 25 open-cell plastic is not required, but only with the aid of the air layer, embossing within the welding points of the closed-cell plastic layers is achieved. In order to make the embossing preferably remain in its shape, e.g., a heat-sealable hard PVC sheet 30 can be placed, e.g.

The embossing obtained can then be used in various ways to decorate the lids or to provide information.

According to our invention, there is no need for adhesives which are used in several solutions.

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The drawing and the related description are only intended to illustrate the basic idea of the invention. Details, such as the number and thickness of the layers of closed cell plastic and open cell plastic, as well as the material of the surface layer, may, of course, vary within the scope of the appended claims.

10

Claims (4)

A method of producing relief image, wherein method layer (2,4) / consisting of PVC-based plastics, high frequency prescription using the desired element (5) of the desired image (6), characterized in that on the plastic layer with PVC-based closed cells (2) and, in the case of an open cell (3, 3 ') applied to this open layer plastic layer (4), a plastic layer (4) is placed, whereby the profile depth (h) of the relief image produced by heating and high frequency sealing is determined. in fact, at the base of the thickness of the open cell plastic layer and of the depth in the image (6) of the printing element (5). Method according to claim 1, characterized in that the profile depth (h) is increased at least at certain image parts by using several open cell plastic layers (3 '). Method according to claims 1-2, characterized in that the open cell plastic layer is partially replaced by air. 20 Method according to claims 1-3, characterized in that a hard PVC layer is placed under the closed cell plastic layer.