EP1688523B1 - Method and device for treating a widthwise stretched textile web - Google Patents

Abstract

Fabric is mercerized after impregnation in a stenter under tension while supported by the stenter pins (14). Additional transverse stretch is applied mechanically near the entrance to the stenter in the edge region (R1), e.g. by intermeshing grooved rollers (4, 5). The region (R1) comprises 2 to 40 % of the fabric width. Additional dilute caustic soda spray (8) is applied in this region (R2) and removed by a suction arrangement (10). An independent claim is included for a device for applying additional mechanical stretch to both edge regions at the stenter entrance, e.g. by intermeshing grooved and ribbed rollers of a width preferably no grater than 5 % of the stenter width. The distance between rollers is adjustable (z) and the grooves are 1.5 to 2.5 times the width of the ribs. Alternative stretching devices can also be used.

Description

The invention relates to a method and a device for treating a stretched, textile web, in particular after impregnation in a mercerizing process according to the preamble of claim 1 and of claim 7, respectively.

In many textile treatment processes with continuous web guiding, but especially during the mercerizing process, a shrinkage of the web can occur, which is caused by the swelling of the individual textile fibers. When Mercerisieren the web in bonded web guide on rollers, the static friction is usually lower than the shrinkage forces occurring. This phenomenon is noticeable above all in the outer edge zones of the textile web. This different effect of the stretching forces on the fabric web has, in a fabric, evidently an influence on the arrangement of the warp threads or on the warp thread density. Even with knitwear, this effect can have a negative effect.

Numerous methods and devices are already known which address this problem. From the EP-A1-305,326 For example, in the stabilization of the textile web, it is known to spray its edge zones in the conical inlet field of the tenter frame more strongly with a hot weak liquor than the middle zone. In practice it has been found that the control of such a method is relatively complex and expensive. It has also been shown that the outer edge regions of the textile material web do not meet increased requirements with regard to uniform quality over the entire width of the textile material web.

From the CH 595 498 A and the US Pat. No. 3,624,874 Methods for treating textile webs have become known in which the web is mechanically stretched over its entire width by means of roller pairs. The rollers have ribs and grooves, which are alternately distributed over the shell of the upper and lower rollers.

It is therefore an object of the present invention to provide a method and an apparatus of the type mentioned in order to achieve a uniform quality over the entire width of the web. This should be achieved without complicated constructive devices. Next, the method and a device should be characterized by better handling. In particular, the warp density should be uniform over the entire width of the textile web. Next existing Mercerisieranlagen should be retrofitted in a simple manner.

According to the invention, these objects are achieved by a method having the features of claim 1.

By applying the web in a first edge region by means of the extender from both sides and thereby causing deformation transversely to the transport direction, a mechanical stretching sets, with which the irregular influence of the shrinking forces of a previous process can be compensated again. Due to this simple measure, the textile material web can later be made up over the entire width and there is no scrap in the edge region. The process is not limited to mercerizing processes and it does not necessarily have to be used on the tentering frame.

The first edge area is in each case at least 2% of the product width and at most 40% of the product width. Preferably, the textile web is mechanically stretched in an edge region of at most 25% of the product width.

However, the use of the method is advantageous in the context of a mercerizing process in which the fabric web is stretched in a tenter after impregnation by means of a pair of clamping chains, wherein in the region of the tenter frame at least a first edge region of the textile fabric web with the aid of one pair of rolls, the only on the first edge region is applied, is mechanically stretched.

Preferably, both outer edge regions of the textile material web are mechanically stretched by means of a respective pair of rolls which acts only on the edge region. The stretching is advantageously carried out transversely to the direction of passage of the textile web or in the direction of the weft threads (in a fabric web). By passing the fabric web between an upper and a lower roll of the roll pair, the knitting area in which to draw can be accurately determined. This can be achieved with a relatively small amount of equipment.

It is particularly advantageous if the mechanical stretching takes place in the parallel field or at the end of the conical field of the clamping frame. Such an arrangement ensures optimized stretching. Also, the handling and process reliability of the process can be further improved.

In a preferred embodiment, at least part of the web for stabilizing spray nozzles arranged above the web is sprayed with a medium, in particular with hot weak liquor. This allows the shrinking forces in the web are degraded, whereby a stabilization of the web takes place. With a relatively low expenditure on equipment so an improved quality over the entire width of goods can be achieved.

It is particularly advantageous if only the outer edge zones are sprayed with the medium. In this way, the edge zones can be specifically stabilized. Preferably, this spraying is done after the mechanical stretching of the edge regions, since then the corrected warp thread number is stabilized. The spray density can be preselected by appropriate adjustment by means of control valves. Alternatively, the outer edge zones of the web can be sprayed more strongly than their middle zone.

It is advantageous if the first edge region, which is mechanically stretched, is less than or equal to the outer edge zone in which the textile material web is sprayed more strongly or even at all.

Of course, following the conclusion of the stabilizing process, the textile material web can be uniformly sprayed over the entire width of the product with the medium, in particular with the hot weak liquor.

It is particularly advantageous if the medium is sucked off directly at the place of spraying or shortly afterwards with the aid of a suction device. Preferably, the spraying and the suction takes place within less than 5 seconds, preferably within less than 1 second. The stabilization process can thus be initiated and accelerated immediately.

The invention also relates to a device having the features in claim 7. By the arrangement of the extender, between which the web is guided, can be particularly simple way, the web is acted upon on both sides and thereby deformed so that the desired mechanical draft setting. The extenders may be sliding or rolling pressed against the web and suitably profiled components. Conceivable are offset to one another arranged rolling elements such as balls, discs or the like, which are pressed against each other.

In an advantageous embodiment for mercerizing the material web with a tensioning frame having a tensioning chain pair for spreading and transporting the material web after impregnation, the stretching means are a pair of rollers having an upper and a lower roller. On the lateral surface of the upper and lower rollers are arranged interlocking, preferably approximately parallel to the transport direction extending ribs and grooves. However, the two rollers can also engage helically in each other, wherein depending on the course or after the pitch of the screw, an additional train can preferably be achieved inwards.

The web is forced transversely to the direction of passage in a slightly sinusoidal or zigzag shape and thereby stretched. The ribs and grooves are advantageously rounded, whereby the tissue is not injured. Preferably, the rollers are approximately cylindrical. The rollers of a pair of rollers are then preferably arranged axially parallel to each other, wherein the axes of the upper and lower rollers are particularly preferably in a plane which is perpendicular to the textile web and in particular vertically. Such rollers may be formed substantially in one piece. However, it is also conceivable that a roller is composed for example of a plurality of individual discs of different diameters, wherein the discs are arranged alternately side by side. Of course, instead of rolling, other rotatable elements could be provided, which cooperate in such a way that the textile material web can be mechanically stretched in the effective range of the rolls.

The rollers are preferably freely rotatably mounted. It is also conceivable that at least one of the rollers of the roller pair is rotatably drivable. It is then conceivable that the rotational speeds of the rollers of the roller pair with each other or in relation to the transport speed are different, whereby a longitudinal tension can be exerted on the fabric during the passage.

The pairs of rollers are advantageously arranged in the parallel field or at the end of the conical field of the clamping frame.

The width of the rolls can be at most 40%, preferably at most 25% and particularly preferably at most 5% of the tenter width. The clamping frame width is essentially determined by the distance between the clamping chains of the tensioning chain pair.

The ribs and grooves may be distributed uniformly alternately over the shell of the upper or lower roll. In this way, a nearly uniform width expansion is ensured in the edge region of the textile web. The distance between the individual ribs can be at least 5mm and at most 50mm. Of course, the rib-groove arrangement may also have an uneven distribution.

The ratio of the width of the grooves to the width of the ribs is advantageously between 1.5 to 2.5.

The upper and / or lower roller can be displaceably mounted, the displacement advantageously being perpendicular to the textile material web and, as a rule, vertical. A slidable arrangement of the rollers allows adjustment of the Distance or the gap space between the rollers, whereby the stretching or width expansion of the edge region of the textile web can be adjusted in a simple manner.

It is advantageous if at least one spray nozzle arranged above the clamping frame is provided for spraying at least part of the textile material web with a medium, in particular with hot weak liquor. These are preferably downstream of the roller pair with respect to the transport direction.

Preferably, the sprayed outer edge zone corresponds approximately to the mechanically stretched first edge area. The spray nozzle is assigned to a respective pair of rollers. A single spray nozzle may be arranged in each case centrally with respect to the transverse direction of the textile material web to form a pair of rollers. Of course, depending on the size of the roll widths, a plurality of spray nozzles may also be assigned to a pair of rolls.

Furthermore, a suction device can be provided for sucking off the medium, in particular the hot weak liquor. Such an arrangement ensures that the stabilizing process is intensified in a simple manner.

To be able to treat different web widths, the clamping frame advantageously has an adjusting device for changing the distance between the two clamping chains, wherein the pairs of rollers, the spray nozzles and the suction device are secured to the clamping frame, that they are adjustable together with the clamping chains. In this way, the pairs of rollers on the two first edge regions or outer edge zones always about the same distance to the outer edge of the textile web.

It when the suction device has a suction box with at least one suction slot, which is particularly advantageous each associated with a pair of rollers, wherein the length of the suction box corresponds approximately to the width of the sprayed with the medium outer edge zone.

Figur 1

Eine schematische Darstellung eines Querschnitts durch einen Spannrahmen mit jeweils seitlich angeordneten Walzenpaaren,

Figur 2

Ein Querschnitt durch den Spannrahmen gemäss Figur 1 mit jeweils seitlich angeordneten Sprühdüsen,

Figur 3

Ein Querschnitt durch einen Spannrahmen gemäss Figur 1 mit einer alternativen Anordnung von Sprühdüsen,

Figur 4

Eine Ansicht auf ein Walzenpaar in Transportrichtung,

Figur 5

Eine Seitenansicht eines Teils eines Spannrahmens einer Mercerisiermaschine,

Figur 6

Eine Ansicht auf das Walzenpaar in Figur 5 in Transportrichtung,

Figur 7

Eine Seitenansicht der Anwendung gemäss Figur 6.

Figur 8

Ein alternatives Ausführungsbeispiel von Streckmitteln mit gegeneinander pressbaren Kammelementen,

Figur 9

Ein weiteres Ausführungsbeispiel von Streckmitteln mit gegeneinander pressbaren Kugelelementen, und

Figur 10

Ein weiteres Ausführungsbeispiel von Streckmitteln mit gegeneinander pressbaren Scheibenpaketen.

Further individual features and advantages of the invention will become apparent from the following description of the embodiments and from the drawings. Show it:

FIG. 1

A schematic representation of a cross section through a clamping frame with laterally arranged pairs of rollers,

FIG. 2

A cross section through the clamping frame according to FIG. 1, with spray nozzles arranged laterally in each case,

FIG. 3

A cross-section through a clamping frame according to FIG. 1 with an alternative arrangement of spray nozzles,

FIG. 4

A view of a pair of rollers in the transport direction,

FIG. 5

A side view of part of a tenter frame of a mercerizing machine,

FIG. 6

A view of the pair of rollers in Figure 5 in the transport direction,

FIG. 7

A side view of the application according to FIG. 6.

FIG. 8

An alternative embodiment of stretchers with mutually pressable comb elements,

FIG. 9

A further embodiment of extenders with mutually pressable ball elements, and

FIG. 10

Another embodiment of extenders with mutually pressable disc packages.

A stretcher 11 of a mercerizing system, according to FIG. 1, has a pair of clamping chains 12, 12 'for guiding and transporting a textile material web 2, in particular a fabric web. The clamping chains detect in a known manner by means of needle bars and / or terminals frictionally the edges of the web 2 and stretch them in the conical inlet field of the clamping frame, where increases the distance between the two clamping chains. In each case at the edge of the conical field roller pairs 3, 3 'are arranged, each with an upper and a lower roller 4 and 5, between which in a first edge region R1, the web 2 is guided.

Such pairs of rollers can be used or retrofitted in particular on the clamping frame of the known type. With the help of the clamping frame, the textile web is stretched to the desired width (WB). Subsequently, the web is preferably carried out by a stabilizing and delousing zone, which completes the Mercerisierprozess. Details of the basic Mercerisierverfahren can, for example, from the above-mentioned EP-A1-305,326 or the EP-A-198 793 be removed.

In Figure 1 (as well as in Figures 2 and 3) is symbolically connected to an adjusting device connected to the spindle via a 16 with the aid of a motor M, the arrangement of the clamping chains or pairs of rollers 3, 3 'of the fabric width WB can be.

As can be seen from FIG. 2, outer edge zones R2 can be sprayed with a hot weak liquor with the aid of a spray nozzle 8, 8 '. In this way, a marginal stabilization reaches the web 2. The spray nozzle arrangement according to FIG. 2 is advantageously downstream of the roller pair arrangement according to FIG. Of course, but another order is conceivable. Evidently, the sprayed edge zone R2 can be significantly larger than the stretched first edge region R1 according to FIG. However, as FIG. 6 shows in particular, the outer edge zone R2 is preferably to be selected such that R2 corresponds to approximately R1. The spray density can be preselected by appropriate adjustment of control valves. In this case, any medium having a stabilizing effect on the tissue, but in particular hot weak liquor, can be used as the spray medium.

Figure 3 shows a spray bar for spraying the textile web 2 with hot weak liquor with a manifold 20, valves 9 and spray nozzles 8. With the help of the plurality of spray nozzles 8, the web 2 is sprayed such that the edge zones are sprayed more than the center. Such a spraying device can additionally be provided in the conical inlet field of the clamping frame (cf. EP-B1-340 166 ). It is also conceivable that the spraying device according to FIG. 3 is used instead of the spraying device according to FIG.

As is apparent from Figure 4, the rollers 4 and 5 of a pair of rollers 3 alternately arranged ribs 6 and grooves 7. The rollers 4 and 5 are arranged at a distance a from each other such that the ribs 6 and grooves 7 engage with each other, whereby an approximately sinusoidal gap space between the rollers 4 and 5 is formed. The textile web, which is guided between the rollers 4 and 5, thereby also has a slightly approximately sinusoidal (or zigzag) course in the transverse direction. The mechanical stretching or width expansion of the web 2 depends essentially on the distance a. For this purpose, for example, the lower roller 5 can be mounted vertically displaceable (in the z-direction).

The distance a between the adjacent rollers must be in an area where the fabric is not overstressed. Of course, the size and shape of the ribs, grooves and rollers of the type of fabric used is adapted.

The roller pair 3 acts only on the first edge region R1. This edge region R1 is evidently given by the widths of the rollers B '(or B "). The web 2 is guided at the edge by needle elements 14 and transported in the e-direction. Of course, other types of clamping frames are conceivable instead of a Nadelspannrahmens. The outer edge of the web 2 facing side of the edge region R1 is advantageously removed in the smallest possible distance from the needle elements 14.

The width of the grooves 7 is greater than the width of the ribs. The ratio of the width of the grooves 7 to the width of the ribs is advantageously between 1.5 and 2.5.

As can be seen from the side view according to FIG. 5, the roller pair arranged at the edge is arranged with the rollers 4 and 5 shortly before the parallel field 18 of the clamping frame 11. In this section, which adjoins directly to the conical inlet field 17, the clamping chains run parallel to each other. Between the conical inlet panel 17 and the parallel field 18, a hinge 19 is arranged in the tensioning chain frame. Behind the pair of rollers 3, one or more spray nozzles 8 are arranged in the transport direction e. With the aid of these spray nozzles, the web 2 can be sprayed with a medium, in particular with hot weak liquor (cf., FIG. 2 or 3).

As is apparent from FIG. 6, the nozzle 8 assigned to the roller pair 3 is arranged approximately centrally with respect to the transverse direction. The spraying angle of the spray nozzle is set in such a way the sprayed outer edge zone R2 corresponds approximately to the first edge region R1 defined by the rollers. Preferably, R2 should be chosen so that R2 is slightly larger than R1. By spraying with hot weak liquor is achieved that the mechanically stretched edge region R1 is stabilized.

From Figure 6 are also more details of the storage of the roller pair 3 on the tensioning chain frame 25 can be seen. The upper roller 4 is mounted on an upper roller frame 21 which engages over the tension chain guide 23. The lower roller 5 is mounted on a lower roller frame 22 which is fixed on the inside of the tensioning chain frame, directly above the lower tensioning chain guide 23. Both rollers 4 and 5 rotate on roller bearing pin 24. The lower roller frame 22 or possibly both roller frames are secured with a screw that they can be adjusted in the direction of arrow z to adjust the degree of stretching. The spray nozzle 8 is attached to a nozzle holder 26, which is also attached to the side of the tensioning chain frame 25. Also, the suction box of the suction device 10 is fixed with a holder 27 on the tensioning chain frame and preferably at the same screw as the lower roller frame 22nd

As can be seen from FIG. 7, the medium sprayed onto the material web 2 is sucked off immediately afterwards. For this purpose, a suction device 10 is provided. The suction device 10 includes a horizontal or in the transverse direction extending suction box, which has a plurality of the fabric web 13 facing suction. Of course, other hollow profile variants can be provided instead of the suction box, in particular a round profile could be provided. The suction device 10 is connected via a connection with a suction device (not shown).

The pair of rollers 3 with the rollers 4 and 5, the pair of rollers associated spray nozzle 8 and the suction device 10 are advantageously relatively close to each other. Advantageously, these three elements are arranged in a stabilizing section designated SA, which extends over less than one meter, preferably less than 0.5 meter.

Due to the immediately downstream suction device 10, the hot weak liquor only briefly acts on the textile material web 2.

For the complete conclusion of the mercerizing process, spraying pipes extending transversely to the textile material web and possibly extending over the parallel field of the clamping frame can be arranged, which are provided with spray nozzles distributed uniformly over the entire width of the textile material web. The (not shown) arranged transversely to the textile web spray tubes spray the stretched textile web evenly over the entire width and thus cause a stabilization.

Figures 8 to 10 show alternative embodiments of extenders, which could also be used depending on the nature and condition of the textile fabric 2. According to FIG. 8, an upper stretching block 28 provided with grooves 30 is pressed against a lower stretching block 29 provided with ribs 31. Grooves and ribs extend in the transport direction e, wherein the web 2 is stretched as a result of the deformation. According to FIG. 9, an upper ball cage 32 and a lower ball cage 33 respectively carry a plurality of balls 34, which are each arranged offset from one another. Depending on the radius of the ball and on the distance between the two ball cages, this results in a larger or a smaller draft of the material web 2. According to FIG. 10, the material web becomes 2 is guided between an upper disc pack 35 and a lower disc pack 36. The individual discs of the upper and lower packets are each offset from one another. The effect is comparable to the profiled rollers. However, the disk packages can be designed so that the distance between the individual disks can be adjusted by inserting spacers of different lengths.

Claims (17)

1. A method for the treatment of a broad-stretched textile cloth web (2), in particular after impregnation in a mercerizing process, in which the cloth web is transported continuously in a transport direction (e), and in which it is deformed transversely to the transport direction from both sides, by being acted upon by stretching means (3, 3', 4, 5), in such a way that mechanical drafting occurs, characterized in that the cloth web being acted upon by the stretching means (3, 3', 4, 5) only at least in a first marginal region (R1), whereas the first marginal region (R1) amounts in each case to at least 2% of the cloth width and at most 40% of the cloth width.
2. The method as claimed in claim 1, in which the cloth web, after impregnation, is broad-stretched in a tentering frame (11) by means of a pair of tentering chains (12), characterized in that, a pair of rollers (3) being used as stretching means (3, 3', 4, 5) and in that in the region of the tentering frame (11), at least one first marginal region (R1) of the cloth web (2) is drafted mechanically in each case with the aid of a pair of rollers (3, 3', 4, 5) which acts only on the first marginal region (R1) .
3. The method as claimed in claim 2, characterized in that the mechanical drafting takes place in the parallel field (8) or at the end of the conical field (17) of the tentering frame (11).
4. The method as claimed in one of claims 1 to 3, characterized in that at least part of the cloth web (2) is sprayed, for stabilization, with a medium, particularly with hot weak lye, from spray nozzles (8) arranged above the cloth web.
5. The method as claimed in claim 4, characterized in that only the outer marginal zones (R2) of the cloth web (2) are sprayed, or in that the outer marginal zones (R2) of the cloth web (2) are sprayed to a greater extent than its middle zone.
6. The method as claimed in claim 4 or 5, characterized in that the medium is sucked away directly at the spray-on location or shortly thereafter with the aid of a suction-extraction device (10).
7. An apparatus for the treatment of a broad-stretched textile cloth web (2), in particular after impregnation in a mercerizing process, the cloth web being transportable in a transport direction (e) by means of a transport device and the cloth web can be led through between stretching means (3, 3', 4, 5), by means of which the two sides of the cloth web can be acted upon and the cloth web can at the same time be deformed in such a way that a mechanical drafting occurs, characterized in that only at least one first marginal region (R1) of the cloth web can be acted by the stretching means (3, 3', 4, 5), whereas the first marginal region (R1) amounts in each case to at least 2% of the cloth width and at most 40% of the cloth width.
8. The apparatus as claimed in claim 7 for the mercerization of a cloth web (2), with a tentering frame (11) having a pair of tentering chains (12) and intended for the broad stretching and transportation of the cloth web (2) after impregnation, characterized in that a pair of rollers (3) being used as stretching means (3, 3', 4, 5) and that marginally, in the region of the tentering frame (11), in each case a pair of rollers (3, 3', 4, 5) with an upper and a lower roller (3, 3', 4, 5) is provided, between which the cloth web can be led through, and in that ribs (6) and grooves (7) engaging one into the other and preferably running approximately parallel to the transport direction (e) are arranged, for drafting the first marginal region (R1), on the surface areas of the upper and of the lower roller (4, 5).
9. The apparatus as claimed in claim 9, characterized in that the pairs of rollers (3, 3', 4, 5) are arranged in the parallel zone or at the end of the conical field of the tentering frame (11).
10. The apparatus as claimed in claim 8 or 9, characterized in that the width (B', B") of the rollers (4, 5) amounts to at most 40%, preferably at most 25% and particularly preferably at most 5% of the tentering frame width.
11. The apparatus as claimed in one of claims 8 to 10, characterized in that the ribs (6) and grooves (7) are uniformly distributed alternately over the surface area of the upper and of the lower roller (4, 5) respectively, the spacing between the individual ribs (6) amounting to at least 5 mm and at most 50 mm.
12. The apparatus as claimed in one of claims 8 to 11, characterized in that the ratio of the width of the grooves (6) to the width of the ribs (6) is between 1.5 and 2.5.
13. The apparatus as claimed in one of claims 8 to 12, characterized in that the upper and/or the lower roller (4, 5) are/is mounted displaceably at least for setting the spacing (a) between the rollers.
14. The apparatus as claimed in one of claims 8 to 13, characterized in that at least one spray nozzle (8) arranged above the tentering frame (11) is provided for spraying at least part of the cloth web (2) with a medium, in particular with hot weak lye.
15. The apparatus as claimed in claim 14, characterized in that the spray nozzle (8) is assigned in each case to a pair of rollers (3, 3', 4, 5) and follows this with respect to the transport direction (e).
16. The apparatus as claimed in claim 14 or 15, characterized in that a suction-extraction device (10) for sucking away the medium is provided.
17. The apparatus as claimed in claim 16, characterized in that the suction-extraction device (10) has a suction-extraction box with at least one suction-extraction slot (13), the suction-extraction box being assigned in each case to a pair of rollers (3, 3', 4, 5), and its length preferably corresponding approximately to the width of an outer marginal zone (R2) .

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