Patent Application
20120058315
The invention relates to technical textiles, and more specifically to coated textiles that include decorative patterns, or, more commonly, markings. It is most specifically implemented in respect of coated textiles for use in the fine leather goods, furnishings, clothing or motor industry.
In general terms, the coated textiles used in fine leather goods are employed as a substitute or replacement for natural materials such as leather or the like. The appearance of these materials is a particularly sensitive matter, and they therefore have to be of impeccable visual quality. Another much sought-after quality in respect of this type of material is good resistance to various mechanical constraints, and particularly to abrasion.
Hitherto, coated textiles have been known that includes a textile web covered with an upper coating layer, typically based on polyvinyl chloride, polyurethane, or thermoplastic polyolefins. For some uses, this coated textile is generally subjected to a processing step resulting in an irregular surface condition, so that the grain of leather can be replicated visually.
In a complementary way, and still for some uses, customizing or decorating the textile complex requires the printing of diverse decorative patterns in the general sense of the term. It may for example be a matter of marking various identification marks, logos or diverse patterns in picture or word form.
The techniques employed hitherto to implement this type of marking use silk-screen printing methods. To do this, according to a conventional technique, the coated textile receives a layer of ink which passes through the pores of a membrane stretched over a frame, and which is permeable in the areas where the patterns are to be drawn.
This silk-screen printing technique does, however, have a number of drawbacks when it is applied to decorating coated textiles with an irregular surface condition. Indeed, and in general terms, silk-screen printing operations are cumbersome, complex and expensive, in so far as they require the use of fixed frames, over which the partially porous membranes are stretched. They, therefore, require printing operations to be carried out on parts previously cut to the dimensions of the frames, which are then joined together for the finishing operations. The production processes impose discontinuous working, with the material for marking immobilised during an entire print cycle. Furthermore, as a function of the contrast between the marking colour and the colour of the upper coating layer of the textile, it may be necessary to print in a plurality of runs, in order to deposit a sufficiently large quantity of ink so that the background colour of the coating layer of the textile does not modify the way the ink layer is perceived. Multiplying these print steps is clearly detrimental to the cost of the overall marking operation.
Furthermore, and from a technical point of view, silk-screen printing gives results of highly debatable quality, and particularly when it is wished to make items that have a grainy or generally irregular surface condition. Indeed, the graining operation is more generally performed by passing the textile complex under an impression that has the inverted graining pattern, which is applied with temperature and pressure conditions so that it matches the upper coating layer of the complex. To work continuously, this operation is generally performed using a calender, one of the rolls of which has the required graining pattern, together with appropriate heating means. In fact, it is generally noted that the use of a certain temperature and pressure triggers colour modification phenomena in the markings obtained by silk-screen printing, or even also the appearance of bubbles that arise between the upper surface of the coating layer and the layer of silk-screen printing ink. These phenomena translate into an unfavourable visual appearance. Furthermore, the inks used for silk-screen printing have less abrasion resistance and flexural strength, which causes the decorated items to deteriorate over time.
One of the objectives the invention sets out to achieve is the elimination of these drawbacks, so that patterns can be produced that combine good visual qualities with better mechanical performance, and abrasion resistance in particular, and to do so by enabling the production of highly varied form patterns, geometries and colours. Another objective is to simplify production process operations, with the aim of eliminating the cutting and/or joining operations, which render the current process discontinuous.
The invention relates therefore to a method for producing a textile complex conventionally comprising a textile web and an upper coating layer, and having an irregular, i.e. not perfectly plane, surface condition. This complex includes decorative patterns applied onto the upper coating layer.
In accordance with the invention, the method includes at least the following steps: preparing a multi-layer transfer complex, including a substrate layer, on which the cut decorative patterns lie, arranged in an orientation symmetrical to their future arrangement on the textile complex, each decorative pattern including at least one coloured layer, in contact with the substrate layer, and a heat-fusible layer, intended to come into contact with the upper coating layer.
In a subsequent step, this multi-layer complex thus prepared is arranged on the upper coating layer of the textile complex, by affixing the surface of the multi-layer complex with the heat-fusible layer to the coating layer. Then, in a subsequent step, temperature and pressure conditions are applied that trigger the adhesion of the heat-fusible layer to the upper coating layer of the textile complex. Then, after the substrate layer has been withdrawn or removed from the multi-layer decoration complex, a layer of varnish is deposited which coats the upper coating layer and the decorative patterns. Lastly to end with, the assembly is subjected to a processing resulting in a structured and irregular surface condition of the upper coating layer.
Put another way, the invention is directed to producing the patterns on a transfer agent including a substrate layer on which the various patterns are provided, in an inverted configuration. The exposed surface of this decoration complex is then applied to the coated textile, so that it can bond thereto under the effect of the heat and the pressure. Then, the substrate layer, which was acting as a support for the various patterns relative to each other, is removed by being stripped off to leave the possibility of performing various finishing operations, in particular by graining.
In this way, patterns are obtained that are particularly resistant, since they adhere very firmly to the coating layer covering the textile, and they are consequently able to undergo with better resistance the subsequent steps of embossing, graining or the like. The assembly therefore has better abrasion resistance, compared with the known techniques of marking by silk-screen printing.
In practice, it is possible to produce this transfer complex according to different operational modes, depending on the intended uses.
Thus, in a first scenario, the preparation of the transfer complex includes starting from a multi-layer complex that includes at least one substrate layer, coloured layer and heat-fusible layer, cutting the coloured layer and the heat-fusible layer solely along the outlines of the decorative patterns to be produced, and doing so without cutting the substrate layer. This preparation continues by removing the fractions of the coloured layer and the heat-fusible layer, located outside the pattern areas.
In another scenario, the preparation includes, starting from a complex that includes at least three basic layers, namely a holding layer, a heat-fusible layer and a printable decoration layer, in printing the printable decoration layer in order to form the coloured layer, and then cutting the coloured layer and the heat-fusible layer along the outlines of the decorative patterns, without cutting the holding layer. It is then possible to proceed in a plurality of ways, depending on the materials and intended uses. The fractions of the coloured layer and the heat-fusible layer outside the pattern areas can thus be removed, and the remaining areas of the coloured layer are then covered with the substrate layer, so as finally to remove the holding layer. A transfer complex is thus obtained that can be applied to the coated textile. It is also possible to perform these operations in the reverse order, by covering the entire printed layer in order then to remove the holding layer and the fractions of the coloured layer and the heat-fusible layer, outside the pattern areas.
Thus, in this second scenario, it is possible to deposit patterns that have a total variety of colours, by printing, upon request, an appropriate coloured layer, for example, by an ink jet method.
Advantageously, in practice, the heat-fusible layer can be bonded to the upper coating layer of the textile complex via a transfer step that includes exposure to a heat source, calendering, and then cooling.
Advantageously, the cooling may be carried out while the textile complex and the multi-layer complex are under pressure. This ensures in particular optimum adhesion, since when the cooling is carried out under constraints, it limits the creation of areas of debonding of the marking elements.
In practice, the choices of thicknesses and materials for the various layers allow diverse finishing and particularly graining steps to be carried out, which may be applied, manually or automatically. It is thus possible to subject the assembly to a processing resulting in a structured surface condition of the upper coating layer of the textile complex. The excess thickness effects due to the additions to the multi-layer complex are much reduced, or even cancelled during these finishing operations, by means of which the multi-layer complex is as if integrated into the upper surface of the coating layer of the coated textile.
In practice, it is also possible to use coated textiles which, prior to the inventive method, have been subjected to a print operation, which has conferred upon them an original visual appearance, onto which the decorative patterns implemented in accordance with the invention will be superimposed. The decorative patterns may thus be positioned in a chosen way relative to the original printing of the coated textile.
Thus, in relation to the complex produced in accordance with this method, it may be observed in terms of the decorative patterns, that it includes, on top of the textile coated layer, a first layer of heat-fusible polymer covered with a second layer based on a coloured polymer, possibly covered overall with a layer of varnish.
The way in which the invention may be implemented, together with the resulting advantages, will become clearer from the description of the following embodiments, supported by the appended drawings.
Clearly, the dimensions and particularly the thicknesses of the various layers making up the various associated objects, whether it is the multi-layer decoration complex or the coated textile, are given solely by way of example. They may be quite different from the thicknesses observed in respect of real products, and have therefore been exaggerated so that the invention can be represented and understood.
As already disclosed, the invention relates to a method for decorating coated textiles, which uses a multi-layer complex for defining the patterns which are then transferred to the coated textile.
A multi-layer complex of this kind is shown in
The multi-layer complex 1 also includes an intermediate coloured layer 4, which may typically be based on a coloured polyurethane film. In the form illustrated, this coloured layer 4 is associated with a second intermediate coloured layer 3 typically white or the like, which has opacifying power, such that the coloured layer 4 will not see its colouring disturbed by the background onto which the pattern will be transferred. Typically, the opacifying layer 3 has thicknesses of about a few tens of microns, and typically between 15 and 40 micrometres, and more specifically, close to 30 microns.
Above the coloured layers 3, 4, the multi-layer complex 1 includes an upper heat-fusible layer or film 2, of a thickness of about a few tens of microns, and typically between 20 and 60 micrometres, and preferentially, close to 30 microns. This heat-fusible layer 2 is made based on a polymer such as co-polyester or the like, for example, with a melting point close to 125° C. Other heat-fusible materials may be used depending on the chemical nature of the coating layer.
In a first step in the inventive method, this multi-layer complex 1 is prepared by cutting the outlines 6 of the patterns for transfer, taking into account that the heat-fusible layer 2 will then be affixed to the coated textile. The patterns must then be inverted at the time of cutting. Importantly, this cutting must be performed solely on the layers which will be transferred, i.e. on the heat-fusible layer 2 and the coloured layer or layers 3,4. It is vital that the substrate layer 5 is not cut, or at least only partially, so as to retain its substrate function and ensure the positioning of the various patterns relative to each other. The cutting is therefore performed by means of conventional tools so that the depth of cut can be calibrated.
As illustrated in
As illustrated in
In a subsequent step, the outlines of the patterns are cut from the printed surface, taking care to cut only the printable decorative layer 103 and the heat-fusible layer 102, and without cutting the holding layer 107, at least not in a proportion that might cause it to tear when it is stripped off.
As illustrated in
As illustrated in
Clearly, and in an alternative not illustrated, it is also possible to peel away directly after cutting the outlines of the patterns, and to do so before the substrate layer is put in place. In this case, the latter is put in place subsequently, and lies directly on the top of the cut patterns. The holding layer alone should then be removed.
As illustrated in
In one particular embodiment that gives satisfaction in terms of graining stability, using textiles with the coating layer thereof being based on polyvinyl chloride, a coloured polyurethane-based layer is employed, with a Young's modulus at 100% elongation of between 50 and 100 kg/cm2, and typically close to 63 kg/cm2, and a hardness of between 60 Shore A and 40 Shore D, typically close to 85 Shore A. Complementarily, the graining stability is improved when the heat-fusible layer is chemically compatible with the material constituting the coloured layer. This is the case, for example, when employing a heat-fusible layer based on co-polyester, and combined with a coloured polyester-based polyurethane layer.
It is also possible, as illustrated in
As illustrated in
The coated textile covered with the multi-layer complex next moves into a second station 22 known as a “transfer station.” In the first part 23 of this station, the coated textile 30/multi-layer complex 31 assembly passes between two belts 35, 36, after passing through an area including two rolls 33, 34 placed opposite one another so that pressure can be applied on the two elements 30, 31 for assembly. In this first area 23, heating means 38 are provided in the upper belt circuit 35, so as to heat the multi-layer complex 31, and in particular its heat-fusible layer. The temperature prevailing in this area, on the upper coated textile surface, may depend on the chemical nature of the heat-fusible film. A temperature of between 120 and 180° C., and close to 150°, may bring good results with the co-polyesters described above in composition of the heat-fusible layer. To avoid deterioration of the coated textile and in particular of its coating layer, the temperature may be maintained at much lower levels in the lower belt 36. Maintaining an ambient temperature means that deterioration of the coated textile can be avoided.
Upon leaving the first part 23 of the transfer station, the coated textile multi-layer film assembly passes between two rolls 41, 42 of a calender 24, so that pressure can be applied that promotes intimate hot contact between the heat-fusible layer and the upper surface of the coating layer of the coated textile 30. This pressure may typically be between a few Newtons and a few tens of Newtons approximately per square centimetre. The gap between the belts 35, 36 at the calender 24 may be set very slightly below the thickness of the coated textile, it being understood that said thickness is much greater than the thickness of the multi-layer decoration complex, unlike what may be seen in the figures which, it will be remembered, are given by way of example.
After the transit between the calendering rolls 41, 42, the facility includes a cooling area 25, in which the temperature is maintained at a low level, typically at ambient temperature, underneath but also on top of the coated textile. This cooling is carried out under constraint, i.e., pressure is maintained between the two belts 35, 36 such that the heat-fusible layer, but also the coloured layer and the coating layer of the coated textile, cool down while remaining in contact with each other, and do so in order to avoid the creation of debonding areas, or the appearance of bubbles.
At the output from the transfer station 22, the machine 20 includes a stripping station 26, in which the substrate layer 5 of the multi-layer film is removed, using manual or automated means.
Subsequently, at a station 27, the coated textile receives a deposition of a layer of varnish in order in particular to protect against external mechanical and/or chemical stresses and also to achieve the required lustre.
The coated textile may then be subjected to various finishing operations, and particularly, as illustrated in
As illustrated in
It is clear from what has been said that the inventive method has the advantage of allowing marking which has better abrasion resistance and a better quality of finish relative to the grained coated textile known hitherto, and with a more cost-effective method.
Although embodiments have been described herein, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0952747 | Apr 2009 | FR | national |
The present application is a National Stage Application of PCT International Application No. PCT/FR2010/050795 (filed on Apr. 27, 2010), under 35 U.S.C. §371, which claims priority to French Patent Application No. 0952747 (filed on Apr. 27, 2009), which are each hereby incorporated by reference in their respective entireties.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/FR2010/050795 | 4/27/2010 | WO | 00 | 10/25/2011 |
