PRINTING MACHINE AND METHOD FOR PRINTING TEXTILES

Abstract

The invention relates to a printing machine and a method for printing textiles with a machine bed, at least one conveying means arranged on the machine bed for conveying at least one textile along a processing path, at least one priming means arranged on the machine bed for applying a primer in a planar manner on a motif region of the textile, on which a print motif is to be provided, and at least one printing means arranged on the machine bed and having at least one digital print head for printing the print motif. In accordance with the invention provision is made in that along the processing path between the priming means and the printing means at least one pressing means is arranged which is designed for pressing the motif region with the applied primer.

Claims

1.-12. (canceled)

13. Printing machine for printing textiles that have a basic color with a machine bed, at least one conveying means arranged on the machine bed for conveying at least one textile along a processing path, at least one priming means arranged on the machine bed for applying a primer in a planar manner on a motif region of the textile, on which a print motif is to be provided, wherein the primer covers the basic color of the textile, and at least one printing means arranged on the machine bed and having at least one digital print head for printing the print motif, wherein the priming means is designed for applying the primer with a layer thickness ranging between 10 μm and 500 μm, along the processing path between or before the priming means and the printing means at least one pressing station is arranged which is designed for pressing the motif region and thus, together with the priming means, is designed for leveling out and evening out the three-dimensional structure of the textile with the applied primer and a previous and/or subsequent pressing, wherein through the primer pores and mesh openings of the textile are covered and a closed area of the motif region is formed, and in that by means of the at least one conveying means the textile can be transported between the priming means and the pressing station and between the pressing station and the printing means.

14. Printing machine according to claim 13, wherein the pressing means has at least one press plate which can be heated.

15. Printing machine according to claim 13, wherein the priming means has at least one application nozzle for applying the primer.

16. Printing machine according to claim 13, wherein at least two parallel, adjacent conveying means are provided and for each conveying means the at least one priming means and/or the at least one printing means have a same position in relation to the respective processing path.

17. Printing machine according to claim 16, wherein above the conveying means the adjacent priming means and/or printing means each have a joint guide beam, along which application nozzles for the primer and/or print heads of the printing means are displaceably supported in a direction transverse to the processing path.

18. Printing machine according to claim 13, wherein the priming means and the printing means are designed in one station.

19. Method for printing textiles that have a basic color, in particular with a printing machine according to claim 13, in which at least one textile is conveyed by means of at least one conveying means on a machine bed along a processing path, along the processing path on at least one priming means a primer is applied in a planar manner onto the textile on a motif region of the textile, onto which a print motif is to be applied, wherein the primer covers the basic color of the textile, and on at least one printing means along the processing path the primed motif region is printed by at least one digital print head in order to form the print motif, wherein the primer is applied with a layer thickness ranging between 10 μm and 500 μm, before and/or after application of the primer and before printing of the print motif the motif region of the textile is evened out by means of at least one pressing station by leveling out and evening out the three-dimensional structure of the textile through the applied primer and a previous and/or subsequent pressing so that afterwards the actual print motif can be applied onto this evened out motif region, in that the pressing station is arranged before the priming means or between the priming means and the at least one printing means, wherein through the primer pores and mesh openings of the textile are covered and a closed area of the motif region is formed.

20. Method according to claim 19, wherein the primer is white.

21. Method according to claim 19, wherein during pressing onto the motif region of the textile the applied primer forms a continuous base area which preferably is plane.

22. Method according to claim 19, wherein before application of the primer the motif region is pretreated with a pretreatment medium to a lesser extent than the extent of a pretreatment for the direct application of a printing ink.

23. Method according to claim 13, wherein several printing inks are printed, of which one printing ink is white.

24. Method according to claim 19, wherein the pressing takes place with a press plate which is heated to a defined temperature range.

Description

[0017] A preferred embodiment of the invention resides in the fact that the priming means and the printing means are designed in one station. Thus, the priming means and the printing means can be designed at the same location, while the pressing means is spaced apart therefrom. Initially, the textile is provided with a primer by the priming means, with the textile thus processed being conveyed by the conveying means to the pressing means. Afterwards, the textile is conveyed back to the first processing location where the textile is then printed by the printing means. The primer can be applied by the same print heads that are also provided for the printing inks.

[0018] With regard to the method the invention is characterized in that before printing of the print motif the primed motif region of the textile is pressed by means of at least one pressing station which is arranged between the at least one priming means and the at least one printing means.

[0019] The method can in particular be carried out by the previously described printing machine according to the invention. The advantages set out beforehand with regard to the application of the print motif at a high quality level can be achieved thereby.

[0020] Basically, the primer can be selected depending on a basic color of the textile to be printed. The priming serves the purpose that an intense basic color of the textile does not affect the colors of the print motif that is to be printed. A particularly advantageous embodiment of the invention resides in the fact that the primer is white. In this way, a basic color of the textile, even a black color, can be covered reliably.

[0021] According to the method pursuant to the invention the primer is applied with a layer thickness that can range between 10 μm and 500 μm. In particular, through a primer filaments protruding from the fibers are covered and embedded in the applied primer layer at least during the subsequent pressing. The primer can only extend on an upper side of the fibers and threads of the motif region of the textile. In the case of a corresponding application quantity the primer can also cover the pores or mesh openings of the textile as a whole so that a largely closed area is then formed. All in all, after pressing the motif region can thus form a plane area that is free of mesh openings or still has exposed mesh openings.

[0022] In any case, an advantageous embodiment of the method according to the invention resides in the fact that during pressing onto the motif region of the textile the applied primer forms a continuous base area which preferably is plane. The base area has a plane surface that is printed.

[0023] Furthermore, according to an embodiment variant of the method according to the invention it is advantageous that before application of the primer the motif region is pretreated with a treatment medium to a lesser extent than the extent of a pretreatment for the direct application of a printing ink. The textile is preferably pretreated with a pretreatment fluid, in which case only about a third to a half of the pretreatment fluid is required as compared to a regular textile printing process. A reason for this can be seen in the fact that the primer also contributes to the sealing of the individual fibers and therefore a bleeding of the printing inks through the fiber structure is counteracted. Basically, in the case of a corresponding application of the primer it is also possible that a pretreatment with a pretreatment fluid is dispensed with altogether.

[0024] Moreover, it is preferred that several printing inks are printed, of which one printing ink is white. In the method according to the invention a white primer can thus be applied by the priming means. After pressing a white printing ink can be applied subsequently which ensures a so-called highlighting in the motif region.

[0025] The pressing of the motif region of the textile after priming and before the actual printing can basically take place in any chosen way, for instance by means of pressing rolls. According to a further development of the invention it is especially preferred that the pressing takes place with a press plate which is heated to a defined temperature range. The press plate has a plane contact area that is preferably provided with a corresponding coating against the adhesion of ink. Below the textile a corresponding counter-bearing or base plate can be provided that is not heated or is also heated. The press plate applied from above onto the print motif is preferably heated electrically to a temperature range between 60° C. and 150° C. In this way, not only is a good smoothing of the applied primer layer but also a rapid drying and curing of the primer achieved.

[0026] The invention is explained further hereinafter by way of a preferred embodiment illustrated schematically in the accompanying drawing. The drawing shows a schematic plan view of a printing machine according to the invention.

[0027] In the single FIGURE a printing machine 10 according to the invention with a machine bed 12 that is rectangular in plan view is illustrated. On the machine bed 12 in a longitudinal direction thereof two adjacent, belt-shaped conveying means 20a, 20b are arranged parallel to each other. To transport a textile, for example a T-shirt, the conveying means 20 are movable from a front infeed region in a movement or processing direction, which is indicated by an arrow in each case, to an end or removal region. Along the processing path the textiles to be processed and located on the conveying means 20 initially reach a priming means 30. The priming means 30 has a portal-like guide beam 34 that is arranged above the conveying means 20 on the machine bed 12. On an underside of the guide beam 34 a first application head 32 for the first conveying means 20a and a second application head 32 for the second conveying means 20b are arranged for applying a primer onto a motif region of the textile.

[0028] The application heads 32 are designed with one or several application nozzles that are directed downwards to the textile. The application heads 32 are displaceably supported along the guide beam 34 in a direction transverse to the conveying direction or the processing path of the textile. The application heads 32 can thus cover the entire width of the conveying means 20 and apply the primer in this region. In addition, the application head 32 of the first conveying means 20a can be displaced as far as over the second conveying means 20b to replace or assist, where necessary, the application head 32 provided there.

[0029] After application of a primer the textile with the primed motif region is conveyed further in the conveying direction to a pressing means 50. On the pressing means 50 a height-adjustable press plate 52 is arranged for each conveying means 20, which can preferably be pushed by a pneumatic or hydraulic cylinder from an upper retracted position into a lower processing position, in which the press plate 52 is pressed onto an upper side of the textile on the conveying means 20. The press plates 52 can also be supported on a portal-like guide beam 54 above the conveying means 20 on the machine bed 12. By preference, the press plates 52 are heated electrically so that the motif region on the textile provided with the primer can be pressed and dried at the same time. Before priming the motif region can be pressed and additionally smoothed by the pressing means 50 or another pressing means connected upstream.

[0030] According to the invention, in the pressing station 50 a particularly plane motif region can also be produced on a coarsely woven textile. Afterwards, the textile is conveyed onwards by means of the conveying means 20 to one or several printing means 40. In the illustrated embodiment the printing machine 10 only has a single printing means with a portal-like guide beam 44 supported above the conveying means 20 on the machine bed 12.

[0031] Similar to the design of the priming means 30, on an underside of the guide beam 44 of the printing means 40 two print heads 42 with printing nozzles are arranged, through which a print motif can be applied in a generally known manner onto the motif region of the textile through digital activation of the printing nozzles. The print heads 42 are also adjustable along the guide beam 44 in a direction transverse to the processing path of the textile so that a print head 42 for the first conveying means 20a can replace the print head 42 for the second conveying means 20b. Conversely, the print head 42 of the second conveying means 20b can also replace or assist the print head 42 of the first conveying means 20a.