EP2789731A1 - Device for thermally fixing a textile sheet comprised of a fusible material - Google Patents

Abstract

The device is directed to the heat setting of a textile web, which consists of meltable material. The apparatus comprises a take-off unit having at least one take-off roll (42) for the web. The web wraps around a partial circumference of the take-off roll (42), wherein in this wrap a heat-setting of the web takes place. The peripheral surface of the take-off roll (42) is provided with rugosities which provide for transport of the web in the apparatus. A heated pressure surface of a pressure member presses the web against the peripheral surface of the take-off roll (42). The take-off roll (42) serves as an abutment for the pressure member. So that the device is durable and the products treated on it are dimensionally stable and are characterized by flawless appearance and colorful design, the roughness of the take-off roll (42) should consist of a granular corundum (26). This granular corundum is applied to the outer surface (32) of a metal outer cylinder (33), which acts as a carrier for the Korundkörnung (27). The interior of the take-off roll (42) has at least one roll core (34), which is connected to a rotary drive for the take-off roll (42). The circumference (36) of the roller core (34) is enclosed by a thermal insulation layer (51) which is connected in a rotationally fixed manner to the roller core (34). Finally, the outer cylinder (33) provided with the corundum grain (27) is pulled over the insulating layer (51) and connected to it in a rotationally fixed manner (FIG. 3).

Description

The invention is directed to a device specified in the preamble of claim 1 Art. It deals with a heat-setting of a web. The web is preferably made of a woven or knitted fabric having fusible thread material. A take-off unit for the web comprises at least one take-off roll. The web wraps around a partial circumference of the take-off roll. The peripheral surface of the take-off roll is provided with roughness, which ensure a slip-free transport of the web in the trigger unit.

The peripheral surface of the take-off roll also serves as a counter-surface for a heated pressure member, which is pressed with its pressure surface against the web, which, as I said, wraps around the take-off roll. By heat, the aforementioned heat setting of the web takes place. This heat treatment ensures that the web shrinks, but is permanently fixed in its shape. As a result, later dimensional changes of the web or of the products cut therefrom are avoided. The stresses in the web resulting from previous production and / or finishing processes are eliminated in this thermosetting and a dimensional stability of the web is achieved. Also, the otherwise occurring tendency of the web edges to curl is eliminated. But especially important is the mentioned dimensional stabilization of the bands, because a later undesirable shrinkage of cut from the web products, eg. B. by washing, is prevented. The heat setting temperatures can be between 130 ° C and 180 ° C.

A device referred to in the preamble of claim 1 is known from the DE 92 19 185 U1 known. The roughness of the local take-off roll does not consist of a granular corundum, with which the outer surface of a Outer cylinder is coated, which acts as a carrier for Korundkörnung. Therefore, there arise the even closer to explaining quality reductions of the web during heat-setting.

The textile production of the web can be carried out on the same apparatus where the heat-setting takes place. Furthermore, on the same device, the cutting out of the products can be made from this web. An important field of application is the cutting of strips from the web. Although the latter can be carried out on a device which is separate from the heat-setting device, it is advantageous to do so on the same device on which the textile production of the web already takes place.

In the latter case, heated cutting wires have proven to cut the web into ribbons. The heat-setting of the web according to the invention then takes place on the strips already cut from the web, which can be patterned. An important application of such tapes is the production of label tapes. If the heat-setting takes place on the same device, the bands wrap around the take-off roll, by the roughness of which at the same time a defined positioning of the individual tapes takes place to each other. When the web is cut by the fusion cutters into the individual bands, edges of the melts are formed on the bands. Significantly, the quality of the enamel edges is also significantly improved by heat-setting. Such a device is from the EP 0 389 793 A2 known.

In the known device, the take-off roll is thermally insulated with cork and this cork covered with sandpaper. Their sand grains in the sandpaper act as "roughness" of the take-off roll. The sandpaper is used to transport the tissue. The product made from the web of the known device does not satisfy. One establishes in the known railway a so-called "bleeding of colors"; whereby the color reproduction of the provided in the train pattern is impaired. Dark, black colors look greasy and shiny, which disturbs.

The invention has recognized that these quality reductions of the known web are due to the fact that the substances contained in the thread material of the web diffuse through the sandpaper to the cork layer and are absorbed in the cork. These substances include, for. As wax or spinning oil. The thread material is namely provided before its processing with waxes or spun oils to facilitate the weaving or technical production of the web. In the course of the later heat-setting, the substances contained in the cork from the cork layer and the sandpaper return to the areas of the web. As a result, the color pigments or the structure of the web are influenced and changed. The color and structural appearance of the known web or bands is, as I said, unsatisfactory.

The invention has for its object to develop a durable device referred to in the preamble of claim 1 species in which the products produced from the web are dimensionally stable and are characterized by a flawless appearance and color design. This problem is achieved by the measures specified in the characterizing part of claim 1, which have the following special significance.

A metal outer cylinder of the take-off roller has multiple functions. It first serves as a barrier for the substances contained in the thread material of the web during heat-setting. The outer cylinder of the invention prevents these substances from penetrating to an underlying insulating layer and being absorbed there. The good, color and structural appearance of the web, which is located on the take-off roll, is no longer impaired in the invention.

The metallic outer cylinder is also a good conductor of heat. The heat applied during heat-setting is distributed quickly and evenly throughout the circumference of the outer cylinder. The wall thickness of the outer cylinder should be kept as small as possible in the invention. It It is sufficient to make the wall thickness only so thick that the stability of the cylinder is just barely guaranteed. An outer cylinder of about 4 mm is already sufficiently dimensionally stable. Such wall thickness already ensures a circular symmetry of its cylindrical shape and a homogeneity of a coating to be applied thereon, which will be described in more detail below. This uniformity supports the process of thermosetting and leads to an optimal quality of the thus treated web or bands. The small wall thickness of the outer cylinder also ensures a permanent operating temperature of about 80 ° to 120 ° C.

Finally, it allows the metallic outer surface of the outer cylinder to apply the roughness in the invention in the form of a granular corundum. The coating is expediently carried out by a plasma process. The applied corundum is extremely resistant and thus multiplies the life of the trigger unit in the device according to the invention. Due to the plasma, the individual grains of the corundum can be applied very homogeneously, which in turn has a positive effect on the quality of the web treated thereon. A grain size of about 60 microns has been proven, which would correspond to the FIPA table of a grain size of about P200 or F170. The fabric structure of the web treated on such a device is extremely uniform.

From the DE 1 460 185 A a device is known in which mineral threads, in particular glass threads are provided with a coating material, for. B. with a sizing agent. The apparatus brings the coating material from a trough by means of a roller which dips into the liquid coating material in the trough. There, the roller is made of ceramic materials, which occasionally sintered corundum can be used. The application of such a roller to devices for heat-setting textile webs is not removable from it.

The DE 40 14 208 A1 shows a device for full-surface or patterned mechanical refinement of the surface of fabrics which also include textile fabrics. In this surface refinement, there is a brief, impact-like impact of individually controlled fine needles. This results in punctiform modifications of the surface of the fabric at different points in varying thickness. In this case, on the side of the fabric opposite the needles, rolls are occasionally used whose surface is coated with solid particles or granular materials. By means of the needles, the fabric with its surface to be examined is pressed against the sharp-edged solid particles and thus obtains the desired surface refinement. This has nothing to do with a heat-setting of textile webs with which the invention is concerned.

Fig. 1

in perspektivischer, schematischer Darstellung verschiedener Arbeitsphasen beim webtechnischen Herstellen einer Bahn auf einer Vorrichtung, auf welcher die Bahn auch gleich in mehrere Bänder geschnitten wird;

Fig. 2

eine schematische Seitenansicht einer solchen Vorrichtung, wo das Schneiden der Bahn von Fig. 1 durch einen als beheizter Heizdraht ausgebildeten Schmelzschneider erfolgt und wo - vor dem Fixieren der Kanten - die Bänder in einer Nachbehandlungseinrichtung geglättet werden;

Fig. 3

teilweise im Längsschnitt, die Draufsicht auf das eine Endstück einer Abzugswalze der in Fig. 1 gezeigten Abzugseinheit, die - im Walzenquerschnitt gesehen - einen besonderen Schichtaufbau aufweist;

Fig. 4

,in starker Vergrößerung, eine Detail aus dem Schichtaufbau der Abzugswalze in jenem Bereich, der in Fig. 3 mit IV gekennzeichnet ist; und

Fig. 5

einen Querschnitt durch die Rohrwand der Abzugswalze längs der Schnittlinie V-V von Fig. 3.

Further measures and advantages of the invention will become apparent from the dependent claims, the following description and the drawings. In the drawings, the invention is shown schematically an embodiment. Show it:

Fig. 1

in a perspective, schematic representation of various phases in the webtechnischen producing a web on a device on which the web is also cut directly into several bands;

Fig. 2

a schematic side view of such a device, where the cutting of the web of Fig. 1 takes place by means of a melting cutter designed as a heated heating wire and where - before the edges are fixed - the bands are smoothed in an aftertreatment device;

Fig. 3

partially in longitudinal section, the top view of the one end of a take-off roll of in Fig. 1 shown withdrawal unit, which - seen in the roll cross section - has a special layer structure;

Fig. 4

, in high magnification, a detail from the layer structure of the take-off roll in that area, the in Fig. 3 marked with IV; and

Fig. 5

a cross section through the pipe wall of the take-off roll along the section line VV of Fig. 3 ,

The Fig. 1 shows only the in Fig. 2 designated at 21 beginning portion of a device 20 on which a web 10 is made by weaving. Such a web 10 could also be made on other textile machines, such. B. knitting machines. The web 10 could also be a nonwoven, film, or other web-shaped product made of meltable material.

In the present case, the web 10 is made of thread material. In Fig. 1 the web 10 is a woven fabric and is produced at the weaving point marked there by 12 by crossing warp threads 11 with weft threads 14. The weft threads 14 extend over the entire width 13 of the web 10 and determine the web width. In the present case it is a web 10 for the production of tapes 10 ', which are later dissected into sections and then act as labels. The bands 10 'are therefore provided on their show side 16 with woven patterns 17. The patterns 17 appear in multiple arrangement in adjacent longitudinal strips 18. The back of the wide web 10 is denoted by 15. Also in the transverse direction of the longitudinal strips 18, the patterns 17 appear in multiple arrangement.

In the space 19 of two longitudinal strips 18 fusion cutters are provided, which, as from Fig. 2 can be seen, consist in the present case of his heated cutting wire 31. The cutting wires 31 are in the illustrated embodiment part of a smoothing device 30. By the cutting wires 31 separating cuts 22 are generated in the web 10, through which, as already said, the web 10 in numerous bands 10 ' is split. This is done while the web 10 is transported in the direction of the arrow 23 by a deduction unit 40 to be described in more detail. As a result of the separating cut 22 of each cutting wire 31, the edges 10 'of the edges 10 are formed on adjacent edge regions. These are rough and hard because of the melting thread material, but are subsequently treated in the smoothing device 30 combined therewith. In this post-treatment, the melt edges 24 are smoothed by a pressure member and possibly a counter-pressure member. In the present case, the smoothing takes place by utilizing a longitudinal tension of the fabric, as in the DE 196 44 534 C2 is described in detail.

Through these post-treatments, the edges are "ironed" as it were. This leads to a satisfactorily soft strip precursor 10 '. The strip precursor 10 'passes on the device 20 still a deduction unit 40, to which a take-off roll 42 belongs. This take-off roll 42 causes the aforementioned transport 23 of the web 10 and the bands 10 '. The peripheral surface 44 of the take-off roll 42 is provided in the present case with particular roughness to be described here, which serve for a slip-free transport of the tapes 10 'in the take-off unit 40. The appearance of the roughness is schematic in Fig. 4 shown, which, as already said, an enlarged section IV of the take-off roller 42 of Fig. 2 shows.

In the drawing-off unit 40, the drawing-off roller 42 is preceded by a first deflection roller 41, which guides the belts 10 'onto the rough peripheral surface 44 of the take-off roller 42. While the first guide roller 41 can be arranged at a distance from the circumference 44 of the take-off roller 42, the latter, the output-side guide roller 43, as shown by the force arrow 46 in Fig. 2 illustrated, loaded against the peripheral surface 44 of the take-off roll 42 by force. In addition, it is also advisable to provide the peripheral surface of the guide roller 43 with roughnesses 28 which support the aforementioned slip-free transport 23 of the belts 10 'in the take-off unit 40. The take-off roller 42 and the according to the force arrow 46 of Fig. 2 on the other hand, the output side deflection roller 43, which is depressed, produces, apart from the aforementioned transport 23, the required high longitudinal tension in the belts 10 ', in the finished web 10 and in the warp threads 11 during weaving. This is important both for cutting the wide web 10 on the cutting wires 31 and for the aftertreatment at the smoothing device 30, as well as for the heat setting 47 of the belts 10 'taking place on the draw-off roller 42.

The strip end product, which leaves the drawing unit 40, can - compared to the aforementioned longitudinal tension of the web 10 and the bands 10 '- be under a much lower longitudinal tension, which is sufficient to wind the Bandendprodukte on a cloth beam 39. The transport 23 of the railway end product can, according to Fig. 1 be supported by means of further conveyor rollers 38.

The seated before and behind the take-off roller 42 guide rollers 41, 43 determine the peripheral surface 44 of the trigger tree 42 from Fig. 2 apparent wrap 29 of the bands 10 '. As a result, the bands 10 'in the heat-setting region 47 are reliably positioned on the circumference 44 of the take-off roll 42 by the particular roughnesses 45 to be described in greater detail.

For heat-setting 47 is a pressing member 48, which has a heated pressure surface 49. The profile of the pressure surface 49 is adapted to the circumference 44 of the take-off roll 42. Between the pressing member 48 and the take-off roller 42, the belts 10 'are kept stable in position. During their passage they receive in this area a heat treatment by ironing, which leads to the effects already mentioned in the band material. The peripheral surface 44 of the take-off roll 42 should be as unyielding as possible in order to ensure a positionally stable shape of the tapes 10 'in the heat-setting 47. By the force arrow 50 in Fig. 2 the pressure of the pressing member 48 is illustrated on the take-off roll 42, which acts as an abutment for the pressure.

In the invention, the take-off roller 42 is formed in a special way, as from the Fig. 3 to 5 can be seen. The roughness of the take-off roll 42 consist of a granular corundum 26, with which the outer surface 32 of a metallic outer cylinder 33 is coated. The chemical formula of corundum 26 is Al ₂ O ₃ . The outer cylinder 33 serves as a carrier for the corundum coating 35. The corundum 26 consists of a grain whose particle size 27 ≤ 0.06 mm is formed. Based on the FIPA list, the grain size of the corundum 26 can be greater than or equal to F150, but preferably lie at F170. This corresponds, based on a Papierkörnung, about P200 the FIPA list. The outer cylinder 33 itself consists of a steel tube 37 whose pipe wall thickness 53 is less than or equal to 5 mm.

The interior of the take-off roll 42 includes a roll core 34 connected to a rotary drive. As Fig. 3 illustrated, the roller core 34 is constructed of a sleeve 55 which is completed at both ends with a head piece 57. At the head 57 sits in each case a shaft end 58, which serves to support the roller core 34. The sleeve 55 is preferably made of steel and has a wall thickness 56 which is less than or equal to 8 mm. The importance of these measures has already been mentioned at the beginning.

The circumference 36 of the roller core is enclosed by a thermal insulation layer 51, which is non-rotatably connected to the roller core 34. The aforementioned, provided with the corundum coating 35 outer cylinder 33 is pulled over the insulating layer 51 and rotatably connected with it. The thermal insulation layer 51 may preferably be made of rubber 52 or silicone. The thickness of the insulation layer should be at least ≥ 3 mm. The above-mentioned steel pipe 37 of the outer cylinder 33 is positively seated on the peripheral surface 54 of the insulating layer 51. There is a so-called "interference fit" between the outer cylinder 33 and the insulating layer 51.

LIST OF REFERENCE NUMBERS

10

Train ( Fig. 1 . 2 )

10 '

Strip precursor ( Fig. 1 . 2 )

11

Warp thread, first thread material

12

Web site ( Fig. 1 )

13

Width of 10 ( Fig. 1 )

14

Weft thread ( Fig. 1 ), second thread material

15

Back of 10 or 10 '( Fig. 1 )

16

Show side of 10 or 10 '( Fig. 1 )

17

Patterns on 10 or 10 '( Fig. 1 )

18

Longitudinal stripes from 17 to 10 ( Fig. 1 )

19

Space between 18 ( Fig. 1 )

20

Contraption ( Fig. 2 )

21

Starting range of 10 ( Fig. 2 )

22

Separating cut in 10 for 10 '( Fig. 1 )

23

Arrows of the transport direction of 10, 10 ', 10'"( Fig. 1 . 2 )

24

Melting edge ( Fig. 1 )

26

Corundum of 25 (Al ₂ O ₃ )

27

Corundum grain size of 26, particle size of 26

28

Roughness of 43

29

Wrap around of 10 'at 42 ( Fig. 2 )

30

Smoothing device ( Fig. 2 . 3 )

31

Cutting wire of 30 ( Fig. 2 . 3 )

32

Outer surface of 33

33

outer cylinder

34

roll core

35

Corundum coating, coating of 26

36

Extent of 34

37

Steel tube of 33

38

Conveyor rollers for 10 '( Fig. 2 )

39

Cloth tree for 10 '( Fig. 2 )

40

Trigger unit for 10 '( Fig. 2 )

41

input side deflection roller of 40 ( Fig. 2 )

42

Take-off roller ( Fig. 2 to 5 )

43

output side deflection roller ( Fig. 2 )

44

Circumferential area of 42 ( Fig. 2 )

45

Strength of 51

46

Power arrow for 43 42 ( Fig. 2 )

47

Device for thermosetting ( Fig. 2 )

48

Pressing member of 47 ( Fig. 2 )

49

Pressure surface of 48 ( Fig. 2 )

50

Pressure arrow of 48 ( Fig. 2 )

51

thermal insulation layer

52

Rubber for 51

53

Pipe thickness of 37

54

Circumferential area of 51

55

Steel sleeve, sleeve for 34

56

Wall thickness of the sleeve 55

57

Headpiece of 34 ( Fig. 3 )

58

Shaft end of 34 ( Fig. 3 )

Claims (15)

Device (20) for thermosetting a meltable material textile web (10),
which preferably consists of a woven or knitted fabric with meltable thread material (11, 14),
with a take-off unit (40) for the web (10), which has at least one take-off roll (42) for the web (10),
the web (10) wraps around a partial circumference of the take-off roll (42) and the heat-setting (47) takes place in this wrap-around region (29) of the web (10),
the circumferential surface of the take-off roll (42) is provided with roughnesses which ensure a slip-free transport (23) of the web (10) in the device (20),
and in the wrap-around region (29) a heated contact surface (49) of a pressure element (49) presses the web (10) against the circumferential surface of the take-off roll (42) and the take-off roll (42) acts as an abutment for the pressure member (48) during heat-setting (47 ) acts,
characterized,
that the roughnesses of the take-off roll (42) consist of a granular (27) corundum (26) with which the outer surface (32) of a metallic outer cylinder (33) is coated (35), which acts as a support for the corundum grain (27),
in that the interior of the take-off roll (42) has at least one roll core (34) which is connected to a rotary drive for the take-off roll (42),
that the circumference (36) of the roller core (34) is enclosed by a thermal insulation layer (51) to the roll core (34) is rotationally fixed,
and that the outer cylinder (33) provided with the corundum coating (35) is pulled over this insulating layer (51) and connected to it in a rotationally fixed manner. Device (20) according to claim 1, characterized in that the heat-setting (47) takes place on preferably patterned bands (10 '), in particular of label bands, which are produced from a web (10) comprising the meltable material,
the web (10) is cut at the desired locations (19) by means of at least one fusion cutter, in particular a cutting wire (31), into adjacent bands (10 ') and the bands (10') have melt edges (24),
the belts (10 ') wrap around the take-off roll (42) (29) and receive the heat-setting (47) in their wrap-around region (29). Device (20) according to claim 1 or 2, characterized in that the thermal insulation layer (51) consists of rubber (52) or silicone. Device (20) according to claim 3, characterized in that the thickness (45) of the insulating layer (51) ≥ 3 mm is formed. Device (20) according to one or more of claims 1 to 4, characterized in that the metallic outer cylinder (33) consists of a steel tube (37). Device (20) according to claim 5, characterized in that the tube thickness (53) of the outer cylinder (33) ≤ 5 mm is formed. Device (20) according to claim 6, characterized in that the steel tube (37) sits positively on the peripheral surface (54) of the thermal insulation layer (51). Device (20) according to one or more of claims 1 to 7, characterized in that according to the FIPA list, the grain (27) of the corundum (26) ≥ F150 is formed, but preferably lies at F170, which is about P200 of the FIPA List corresponds. Device (20) according to one or more of claims 1 to 8, characterized in that the roller core (34) consists of a sleeve (55), which in turn preferably consists of steel. Device (20) according to claim 9, characterized in that the sleeve (55) has a wall thickness (56) of ≤ 8 mm. Device (20) according to one or more of claims 1 or 10, characterized in that the device (20) is a device for Weaving or knitting the wide web (10) from the thread material (11, 14). Device (20) according to one or more of claims 1 to 11, characterized in that the device (20) comprises a device for cutting the web (10) into strips (10 '), preferably in the form of a heated cutting wire (31), which melts the thread material (11, 14). Device (20) according to claim 12, characterized in that behind the fusible wire (31), but before the pressing member (48) for thermosetting (47) of the tapes (10 '), means (30) for smoothing the strip-melting edges (24) is arranged. Device (20) according to one or more of claims 1 to 13, characterized in that the take-off unit (40) has at least one guide roller (41, 43), which the wrapping region (29) of the bands (10 ') on the take-off roll (42 ) certainly. Apparatus according to claim 14, characterized in that the deflection roller (43) on the output side, that is arranged behind the take-off roll (42) and is also provided on its periphery with roughnesses (28),
the guide roller (43) is loaded with force (46) in the direction of the take-off roller (42),
and that the roughnesses (28) of the deflection roller (43) on the one hand and the corundum coating (35) of the take-off roll (42) on the other hand hold the bands (10 ') between them.

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