DE2161190A1 - Method and device for the continuous printing of material webs - Google Patents

Description

PATENTANW / MTP

DIPL.-ING. GÜNTHER KOCH DR. TINO HAIBACH

8 MUNICH 2, ~ 9 Dt ¹ Z. ΙΠ7Ι

OUR MARK: 13 56 2

HARRICO DEVELOPMENTS LIMITED Leicester, England

Method and device for the continuous printing of material webs

The invention relates to methods and devices for printing on textile fabrics, and according to the invention "certain difficulties that arise when printing on textile fabrics xn Jj'orm result in endless webs, If the known sublastatic printing method is used, the pattern or the like. Which on a separate Web are provided by the action of heat and pressure to be transferred to the textile material; the applicability however, the invention is not necessarily limited to this printing method.

When using the sublastatic printing process, attempts have already been made to carry out the process continuously with textile material; For this purpose, a coherent web of the textile material to be printed is passed over a heated calender roll, the printing web being arranged in contact with the textile material and being pressed against the textile material along part of the circumferential surface of the calender roll in order to make intimate contact bring about between the textile material and the calender roll so

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by the calender roll on effective wines heat on the uruckbahn is transmitted, and-thus simultaneously; the Druokbahri is pressed against the textile material with the required pressure. To apply the necessary pressure, has one also tries to use a driven endless belt or a To use licks which partially wraps around the calender roll; in later tests, a support in the form of a pressure shoe was also used, the shape of which is a Corresponds to part of a cylinder. However, these arrangements have proven unsatisfactory, partly because because it is difficult to bring about heat and pressure in the required manner, and partly because of this, because the textile material is not working properly over the calender roll is guided and folds form in the textile material. Later experiments were carried out with other devices, comprising an endless belt of foam rubber positioned within an endless belt of polytetrafluoroethylene was; the two belts were guided by rollers or rollers along a closed path and driven by a drive roller or drum which simultaneously did so served to press the two belts or belts against the heated calender roll and the textile material together with the To keep the print web in contact with the calender roll; this is where the foam rubber layer comes into play due to its flexibility Effect so that it is possible to apply the pressure evenly to a part of the peripheral surface of the calender roll.

The attempts described above to carry out the process mentioned continuously have all proven to be proved unsatisfactoryj this is due to the fact that the fabric is smeared and wrinkled; this is obviously due to the cumulative effect produced by unavoidable, very small differences in the rotational speeds of the mutually facing surfaces of the endless web of fabric and the print web and, among other things, to a lateral wandering of the web of fabric and the print web to lead. According to the invention are now methods and

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BATH ORIGINAL

Devices created that make it possible to overcome these difficulties to avoid.

More specifically, according to the invention, there is a method proposed for continuous printing of textile fabric in the longitudinal direction, in which the fabric together with a Printing web is guided over part of the circumferential surface of a heated calender roll, and in which the two webs in Pressure contact with the calender roll can be maintained by a fixed, resilient support that attaches to the calender roll Is shaped to match and a cladding made of a heat-resistant and a substantially frictionless material such as polytetrafluoroethylene, in practicing the invention Process has the angle of wrap over which the fabric web is held in contact with the calender roll becomes, preferably a great value, than the greater is the arc along which the fabric touches the roller, the faster the printing process can in general be performed. It is useful to ensure that the length of the fabric with the calender roll is about halfway through their circumferential length is kept in contact, i.e. that the angle of wrap is about 180 °. When you have a support Used of special construction, it is possible to provide an even larger angle of wrap, the e.g. is more than 300 °.

It has been found that there is the use of a stationary nitzesesistent support, which with a substantially Friction-free heat-resistant material is covered, allows the textile web together with the printing web to move with the help of the calender roll and to press the webs firmly against the calender roll without the two Web is incorrectly transported or drifting sideways, and that it is therefore possible to stop the printing process to be carried out properly without holding in the fabric.

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When carrying out the procedure, the substance that To be continuously printed, to be preheated on its way to the calender roll, and after it has run off The fabric is preferably cooled in the calender roll. Also the print web canoe on iiirem sweep is preheated to the calender roll will.

When carrying out the procedure, it is advisable to to feed the fabric web and the print web separately to the calender roll and to preheat both webs independently of each other, before they get to the calender roll and are brought together on it in the preheated state. Thus the The transfer of the heat required for the printing process from the calender roller to the printing web and the fabric web is considerably facilitated, so that it is possible to perform printing at a higher speed. The speed the movement of the material web, in which continuous printing can be carried out properly, can thereby be increased be that the fabric web is brought into contact with as large a part of the circumferential surface of the calender roll as possible. Here A wrap angle of over 300 ° proves to be particularly advantageous.

According to the method according to the invention, the fabric web is after printing and running off the calender roll cooled, e.g. by blowing cold Lult onto the fabric will; the web of material is then wound up into a roll, for example. The print web becomes when running off moved away from the fabric web by the calender roll and directed to a take-up device, e.g. a take-up roll.

j'erner isx according to the invention a device for continuous Printing of textiles created in the longitudinal direction, which comprises a heatable calender roller, furthermore a device for driving the calender roll so ,, ie a stationary pressure pad assigned to the calender roll, which has a flexible, heat-resistant support with a

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gekrümmton recess comprises, attached to one part of the Umfan.rsf laugh of the calender roll fitted, and a TERIAL consisting of a Flachina fairing which covers the transfer surface of the curved recess of the support and consists of a uitzebeständigen and substantially reibun ^r sfreien (/ erkütoff. As a material for this cladding, olytetrafluoroethylene has proven to be particularly useful. The support expediently consists of a heat-resistant rubber or a rubber-like compound, for example neoprene or silicone rubber.

The pressure pad is expediently so supported that it can be brought into and out of contact with the calender roll, co that it can be removed from the calender roll, while the fabric web and the printing web are brought to bear on the roller, whereupon the pressure pad in a position can be brought in which it presses the fabric web and the i / back web firmly against the roller.

If the pressure pad extends along an arc of up to 180 °, the resilient support can be arranged in a rigid block made of metal, plastic or another material. If a pressure pad is used, which extends over an angular range of more than 180 °, the resilient support is with Help their ends supported on a support so that their ends can be pulled together to exert pressure to apply the web of fabric and the printed web, and that the Ends can be removed from each other to release the pressure as needed, leaving a space around the perimeter of the platen is available, which makes it possible, before the start of the printing process, the fabric web and the print web between the To arrange pressure pad and the roller.

In an expedient embodiment the device comprises a drivable, rotatable, heatable calender roll, a resilient pressure pad that divides the calender roll

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wise encloses facilities to support the panel and a printing path, means for feeding the Uruck web and the fabric web to the entry side of the calender roll between this and one end of the resilient pressure pad such that the two webs to rest on the calender roll are brought, a device for removing the fabric web and the Druck'oahn from the calender roll at the exit end the resilient pressure pad and devices that separate the fabric web and the printing web from one another pick up after they have run off the calender roll. Like the one in British patent application 58 427/70 described with a panel made of polytetrafluoroethylene, which is supported by a cushioning material. The inner surface The pressure pad can consist of a glass fiber fabric, which is provided with a cover made of polytetrafluoroethylene, for example is. A layer of flexible rubber or a rubber-like layer can be used as a flexible support for the glass fiber fabric Material may be provided, which is arranged in an outer jacket made of metal, which extends in the circumferential direction extends.

If necessary, a metal foil can be placed between the glass fiber fabric and the support layer of the cushion made of rubber or a rubber-like material be.

According to one of the features of the invention, for a device for continuously printing a web of material with With the help of a printing web, a pressure pad is proposed that partially encloses a calender roll and an elastic, a part of a cylinder forming jacket made of metal, which forms part of a cylinder surface elastic Contains support layer, which on its inside with polytetrafluoroethylene is disguised; here the pressure pad is designed so that it the calender roll over more than enclosing half of its circumference, and the jacket made of metal

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includes endabuelmittees that can be spread apart or each other as required can be approximated · so that it is possible, the inner surface of the pressure pad of the circumferential surface of the calender roll to approach or to lift it off the roller. The pressure pad can form part of an assembly that includes levers, which are connected to the ends of the metal jacket so that these ends towards and away from each other can be moved by pressure-actuated plungers that are coupled to the levers.

.Furthermore, preheating devices can be added to the device be provided, which cooperate with the fabric web or the printing web to these webs on their way to the calender roll to preheat; if necessary, a cooling device, e.g. a fan for cold air, can also be provided, so that the fabric can be cooled on its Yfege from the calender roll to the winding device.

The invention and advantageous details of the invention are shown below with reference to schematic drawings Embodiments explained in more detail. It shows

JB ¹ Xg. 1 in cross section a drivable calender roll and a pressure pad;

Pig. 2 in a Pig. 1 shows a modified embodiment;

Pig. 3 in an end view a calender roll and a Andruekpolster a further modified embodiment;

Fig. 4 is a schematic end view of a complete Printing device;

Pig. 5 shows a pressure pad in an enlarged front view similar to that of Pig. 4 enclosing a calender roll; and

Pig. 6 in a partially broken-away per-

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perspective view of a modified pressure pad similar to that shown in Fig. b .

In Fig. 1 you can see a drivable hollow calender roll 110, in a known manner with the aid of radiant heating devices, not shown, arranged in its interior can be heated. A pressure pad, which provides elastic support, is arranged opposite the roller 110 111 comprises which is curved to match the roller 110 and a thin cladding layer 112 of a substantially friction-free and heat-resistant material, e.g. polytetrafluoroethylene. The support is from a rigid Metal block 115 carried, which is mounted so that it can be moved towards the roller 110 and away from it. In Fig. 2 a double arrangement is shown, which makes it possible to increase the production speed when printing webs of fabric double. In this case there are two similar hollow heatable calender rolls 110 and 110a and two similar assemblies the supports 111 are provided with a coating 112 as well as 111a with a coating 112a; the supports 111 and 111a are back to back with a common stationary Support block 114 connected, which is recessed on both sides so that he the supports in the illustrated Way can absorb. In this case, the calender rolls 110 and 110a are supported so that they are in and out of contact the supports 111 and 111a can be brought,

Fig. 3 shows a calender roll 115 »partially from a resilient pressure pad is enclosed, which has a certain flexibility and a part of a cylinder Forming support 116 includes, which with a thin Layer 117 made of polytetrafluoroethylene or another heat-resistant, frictionless material is provided. The lining layer 117 extends over the rounded edges the support at the ends 118 and 119, by means of which the support is connected to a fixed support. The ends 118 and 119 are provided with halves (not shown)

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tern braced, which can be moved back and forth along the arrows 120 and 121 in order to bring the pressure pad assembly into and out of contact with the calender roll 115, which is rotated about a fixed axis 122 according to FIG. In Fig. 3 at 123 a device for regulating the supply of heat to the fold 115 is indicated schematically.

In each of the constructions described above, the fabric to be printed is in the form of a coherent Web or according to FIG. 2 in the form of two separate webs passed over the relevant calender roll, one printing web covers the or each web of fabric, so that in each case both webs are in firm contact with one another through the or each pressure pad as well as being held on the or each calender roll. The pressure applied ensures a firm touch between the fabric and the peripheral surface of the relevant calender roller, so that the fabric is carried along by the roller that the good heat transfer required for the printing process is guaranteed, and that at the same time the fabric web and the printing web opposite the or each pressure pad be able to move smoothly without shifting against each other or forming folds.

The device shown in Fig. 4 comprises a frame 10, which has a supply roll 11 from the to be printed Fabric and a supply roll 12 for the printing web supported. From these supply rolls, the web of fabric 13 and Printing web 14 via guides 15 or 16 to Ural swivel castors 17 or 18 passed through a small diameter to get to the heated calender roll 19. After the panel 13 and the Printing web 14 has been brought into contact with the peripheral surface of the roller 19 within an angular range of approximately 300 ° are, the two tracks run over deflection rollers 20 and 21 to cradle rollers 22 and 23, which are driven by rollers 24 and 25 will.

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While the web of fabric 13 and the printing web 14 over the roller 19 run, the two tracks are pressed against the roller by a total of 26 designated pressure pad, the construction of which is shown in FIG. The pressure pad

26 extends within an angular range of approximately 300 ° around the roller 19 and comprises an elastic outer jacket 27 made of metal with multiple angled ends 27a and 27b, which carries a layer 28 made of a rubber-like material on its inside, which is covered with a glass fiber fabric 29 is covered, which e.g. a cover made of polytetrafluoroethylene wearing; the ends of the liner 29 are anchored to the ends 27a and 27b of the shell. If necessary, can a thin layer in the form of a metal foil is arranged between the liner 29 and the resilient buffer material 28 be. The elasticity of the jacket 27 and the flexibility of the remaining parts of the pressure pad 26 make it possible for the pressure pad Spread open to relieve the calender roll 19 from the applied pressure, so that it is possible, the Place the fabric web 13 and the printing web 14 around the roller, whereupon the pressure pad 26 is released again, like this ate it springs inward to press the fabric and print web against the roller.

So that the pressure pad 26 can be spread open and closed again, the ends 27a and 27b of the jacket

27 connected to levers 30 and 31, which are shown schematically in FIG and at 32 on part of the frame of the device are rotatably mounted. The levers 30 and 31 can be actuated by pressure medium, e.g., pneumatic rams 32 and 33 are operated, which are on the frame at 34 and 5i? rotatable are mounted and hinged at points 36 and 37 on the levers.

So that the fabric web 13 can be preheated, the Guide 1b> as an elongated plate made of a thermally conductive Material formed that can be heated with the aid of electrical heating elements 38; furthermore, an elec-

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tric radiant heater 39 arranged in the immediate vicinity of aer print web 14 to supply heat to the print web. On the delivery side of the calender roll 19, the fabric web 13 runs over a deflection roller 40, and. between this Deflection roller and the vValze 24 driving the take-up roller 22, the fabric web is cooled by cold air, which is supplied by Cooling tubes 41 is delivered.

In FIG. 6, part of a modified embodiment of the pressure pad 26 according to FIG. 5 is shown. In this case, the pressure pad comprises a thin outer jacket 45 made of metal, for example made of stainless steel and provided with longitudinally spaced slots 46 which extend from one edge of the jacket almost to the other edge, so that according to the upper part 6 there are a plurality of parallel, flexible, circumferentially extending tongues which can be individually adjusted to tension them. On the inside of the jacket 45 is a thin inner jacket 47 made of aluminum, which encloses a support layer 48 made of elastic rubber or a rubber-like material, which corresponds to the layer 28 according to FIG made of poly * tetrafluoroethylene. Said parts 45, 47, 48 and 49 are connected to a support rod 50 by means of a fastening strip 51, and parts 47t 48 _: and 49 are otherwise not fastened, but they are pressed inwards by the outer jacket 45. The free ends of the tongues between the seat strands 46 are each folded over to the outside and riveted in such a way that they form loops 52, each of which encloses a separate short bracket 53.

The end portions of the tongues partially extend around a second support rod 54 and are adjustable with it connected to an angle profile 57; for this purpose screws 55 are each built into the bracket 53 with one end, and nuts 56 are screwed onto the outer ends of these screws.

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screws. The angle profile 57 is distributed at longitudinal intervals Points are welded to the support rod 54. With the help of nuts 56 by the outer jacket 45 on the inner part of the pressure pad and pressure applied to the two webs over the length of the calender roll 19 sp graduated that there is a higher pressure in the middle part of the roller and a lower pressure in the direction of the roller ends Print results, as it is desired at least in certain printing processes.

The support rods 50 and 54 can be operated to open and close the pressure pad with the help of plungers, which are similar to the plungers 32 and 33 shown in Fig. 4, and three or more such plungers can be associated with each support rod which are each operated simultaneously, with a plunger being provided at each end of each support rod, and wherein one or more further plungers can be provided between the ends of each support rod. The direction of action of the applied Forces is indicated in FIG. 6 by arrows 58 and 59. The levers 30 and 31 according to FIG. 4 corresponding Levers for applying these forces must of course be bent so that they wrap around the roller 19 and the pressure pad can extend around.

Expectations:

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Claims (1)

ASSOCIATIONS 1. Process for the continuous printing of textile fabric webs in the longitudinal direction, characterized in that the fabric web together with a printing web is guided over part of the circumferential surface of a heated calender roll, while the fabric web and the printing web be pressed against the calender roll by a stationary, resilient pressure pad that is attached to the calender roll is suitably shaped and a lining made of a refractory and essentially frictionless material, e.g. Polytetrafluoroethylene, has. 2. The method according to claim 1, characterized gekennzei chn e t that the fabric web and the printing web so against the calender roll are printed so that they touch a part of the circumferential surface of the calender roll, which is at least about extends over half of the roller circumference. 3. The method according to claim 2, characterized in that g e k e η η zeicnnet that the angular range within which the fabric web and the printing web against the calender roll pressed and held in contact with it, extends over about 300 ° of the roller circumference. 4. The method according to claim 1, characterized in that g e k e η η zeicnnet, that the fabric web and preferably also the printing web is preheated on its way to the calender roll will. i ?. Method according to Claim 4, characterized in that the web of material after it has run off from the calender roll is cooled. 209826/0967 -H- 6. The method according to claim 4, characterized in that the fabric web and the printed web of the Calender rolls are fed separately so that the fabric web and the printing web are preheated independently of each other, before they reach the calender roll, and that the fabric web and the printing web on the calender roll in the preheated state be brought together. 7. Device for continuous printing of textile material webs in the longitudinal direction, characterized in that a heatable calender roll (110, 110a; 115; 19) it is provided that a device for driving the calender roll is provided, and that the calender roll a stationary pressure pad is assigned which has a resilient, heat-resistant support (111, 111a; 116; 26), which has a curved recess shaped to match a part of the calender roll, and a liner (112, 112a; 117; 29) ι which covers the inner surface of the curved recess of the support and consists of a heat-resistant and essentially friction-free material. 8. Apparatus according to claim 7 »characterized ge & e η η zeicnnet that the lining consists of polytetrafluorethylene. 9. Device according to Anspruah 7 or 8, characterized in that the support consists of a heat-resistant Rubber or a rubber-like mass, e.g. Neoprene or silicone rubber. 10. Device according to one of claims 7 to 9 »characterized in that the pressure pad is mounted is that it can be brought into and out of contact with the calender roll. 11. The device according to claim 10, characterized in that the Andruok cushion along a 209826/0967 2161 ISO Angular range of up to 180 over the circumferential surface of the Calender roll extends, and that the resilient support is arranged on a rigid block (113 »114), taking measures are taken to ensure a radial relative movement between the rigid block and the or each calender roll (110, 110a) to bring about. 12. The device according to claim 10, characterized in that the pressure pad is the peripheral surface of the calender roll (115; 19) within an angular range of more than 180 °, and that the flexible support (116; 26) with the help of its ends (118, 119; 27a, 27b) a support is mounted so that its ends can be pulled together in order to apply pressure to the fabric web (13) and applying the printing web (14) and that the ends can be spread apart to accommodate the applied pressure as required to eliminate. 13 · Device according to one of claims 7 to ^, characterized by holders for supply rolls the fabric (13) in the form of a continuous web and for a printing web (14) ι devices (15, 16, 17 »18) for guiding the printing web and the fabric web to the run-up side of the calender roll (19) between this roller and the front edge of the flexible support (26) in such a way that the fabric web and the printing web on the calender roll under pressure are, means (20, 21, 40) for removing the fabric web and the printing web from the calender roll at the rear Edge of the resilient support and winding devices (22, 23) for receiving the web of material and the one separated from it Print web after running off the calender roll. 14 · Device according to claim 7, characterized by heating devices (38, 39) by which the fabric web (13) and the printing web (14) are preheated at points from which these webs move in the direction of the calender roll (19). 209826/0967 15. Device according to one of claims 7 to 14, characterized characterized in that the inner lining of the pressure pad consists of a glass fabric which is on its outer surface is provided with a coating made of polytetrafluoroethylene. 16. Apparatus according to claim 13 or 14, characterized by a cooling device, e.g. a cold one Air-conveying fan (41) that directs cold air onto the fabric web as it moves from the calender roll to the Winder moves. 17. The device according to claim 7, characterized in that a pressure pad is provided which partially enclosing the calender roll and an elastic jacket (27; 45, 47) forming part of a cylinder Comprises metal having a resilient support layer (28; 48) forming part of a cylinder and an inner liner (29j 49) made of a heat-resistant and essentially friction-free Contains material that the pressure pad is designed so that it is more than half of the circumferential area of the calender roll, and that the jacket of metal comprises a front and a rear end portion, the can be spread apart or brought closer together as required in order to fit the inner surface of the pressure pad onto the circumferential f to move the calender roll (19) towards or away from it. 18. The device according to claim 17 »characterized in that a part of a cylinder forming Sheath (45) is provided which is provided with slots (46) extending in the circumferential direction so that it forming a set of parallel strips that support bars (50, 54) are provided around the front and rear To support the edge of the pressure pad, and that the strips are individually adjustable connected to one of these support rods so that the tension of each strip can be adjusted independently of the rest of the strips. 209826/0967