JP2006518426A - Method for dyeing knitted product webs containing cellulose fibers - Google Patents

Abstract

The present invention relates to a method for dyeing knitted product webs containing cellulose fibers. In order to be able to dye a knitted product containing cellulose continuously with a dyeing bath in the state of being widened, and to dry and fix it with a subsequent dyeing hot fluid in the processing line, the knitted product must first be long. At the directional edge, a transverse line is applied which is gripped by a tension chain that is continuously conveyed and then borders the longitudinal edge region held by the tension chain to reinforce the longitudinal edge. The glue is dried and then the product web released from the tension chain is laid out and continuously guided through the dyeing bath and dyeing hot fluid on the same principle as the woven product web.

Description

  The present invention relates to a method for dyeing knitted product webs containing cellulose fibers. In this case, a glue stripe is applied to the edge area, bordering the longitudinal edges of the knitted product web, before being dyed and cured by drying. The knitted product web is dyed in a dye bath, then dried with a dye hot fluid and dye fixed.

  The knitted product is generally manufactured as a cylindrical body. The product web results from the cylindrical body being cut open as straight as possible in parallel to its longitudinal axis. The cutting edge generated at this time tends to be rounded. “Contains cellulose” means that the knitted product is composed entirely or partially of cellulose.

  The continuous dyeing of a woven product web, which usually does not have its own edges, is done according to the so-called pad-dry principle. The product web, which is then dyed continuously in line, is then dried in a dyeing hot fluid and dyed and fixed. The product web is not retained on the side edges by hot fluting. Thus, conventionally, the pad-drying method could only be used with woven product webs and similar surface-stable product webs.

  Product webs as knitted products containing cellulose fibers, on the other hand, are processed in the so-called draw-dye method or on the cold pad batch principle if dyeing is necessary. This method works discontinuously and is correspondingly time consuming.

  According to DE 101 35 044 A1 and DE 10131000 A1, a method for continuously dyeing a knitted product, where the entire surface is (temporarily) cured or provided with so-called auxiliary edges in the edge region of the knitted product, It is known to remove again. These documents disclose that the product is cured “entirely” (entirely or at the edges) of the dyeing process. Therefore, this pretreatment is not carried out continuously in the same process as staining.

  DE 3238378 A1 discloses several types of edge glue lines or hardening zones at the edges of a knitted product web that tend to curl. DE 19522124 A1 describes edge gluing in a tension frame. In this case, note that the molten adhesive is applied to the edge of the knitted product at the exit of the tension frame.

  An object of the present invention is to provide a dyeing facility for continuously dyeing a knitted product, which is an alternative to a time-consuming method based on a drawing method or a cold pad batch principle conventionally used for dyeing cellulose fibers. is there. In particular, an object of the present invention is to continuously process a knitted product containing cellulose fibers from the width of the product web to drying and dyeing and fixing in one step.

  According to the invention, this problem has been solved by claim 1.

A feature of the present invention is a method of the type described at the beginning,
(B) the tentering at both web longitudinal edges (10) of the product web (1) which tends to curl,
(B) continuously tensioning the product web (1) by fixing both longitudinal edges (10) to a tension chain (6, 7) that continuously conveys,
(C) In the product web feed direction (2), apply a glue stripe in the shape of a glue horizontal line interrupted in the glue-free area, and the length of the glue horizontal line (from the product web edge to the transport direction transversely) The length measured) is 1/25 of the axial spacing between the upper and lower rollers (25, 26) of the dyeing hot fluid (21), but at least about 1 cm,
(D) Release the product web (1) from the tension chain (6, 7) before entering the dye bath (17),
(E) Designing a dyeing hot fluid (21) to guide the product web (1) with an equal product longitudinal tension of the size of 10 Newtons ± 5 Newtons,
That is.

  It is possible to continue the tension-free delivery of the dyed and dried product web in the longitudinal and width directions. Some refinements and alternatives are described in the dependent claims.

  According to the prior art cited previously in DE 101 35 044 A1 and DE 10131000 A1, it is possible to harden at least the edge region of the knitted product web, subsequently dye it continuously, dry and dye and fix the dyed product web Although disclosed, there is no suggestion in this prior art to continuously connect the hardening of the edge region prior to the dyeing, drying and dyeing and fixing processes. However, this is the purpose of the present invention. The present invention as a whole cannot be easily invented based on known techniques. This is because processing a product web that tends to curl at the edges in a continuous working process is premised on edge hardening already done in advance according to expert knowledge.

  In other words, the knitted product web containing cellulose fibers is continuously dyed using a dyeing bath in the widened state, dried and dye-fixed by the subsequent dyeing hot fluid in the production line. In order to do this, the knitted product is first gripped by a tension chain that continuously conveys at the longitudinal edges, then borders the longitudinal edges held by the tension chains and hardens the longitudinal edge area. Loading with glue and then being unrolled continuously (in spite of being released from the tension chain), ie in the production line, through the dye bath and dye hot flue- It is guided by the same principle. Advantageously, the upper and / or lower rollers of the hot fluid are driven.

  In a hot fluid used for dyeing fixation and drying, for example according to DE 33336328C2, the product web is guided up and down in a meandering manner via guide rollers with a predetermined longitudinal pulling force. In the lower region and the upper region in the hot fluid, a group of rollers composed of guide rollers (so-called upper or lower rollers) substantially parallel to each other are arranged on a common plane. The product web loops stretched between the two upper guide rollers or the two lower guide rollers, respectively, are generally heated from above or below with heated air blown for drying and fixing.

  Without a predetermined longitudinal pull, the product web cannot be moved through such a hot fluid. In the case of a product web, which is a woven product, this generally does not cause problems. However, in the case of product webs made of knitted products (product webs that do not have edge regions that are not stabilized according to the invention), the product web is machined (stabilizing roller) as a result of the longitudinal pulling force. The web edges gradually curl as they pass through the individual loops of the hot flutes, and in extreme cases strands are formed from the web that has been unrolled. Will be. Such strands do not exhibit the advantages of hot flutes, and therefore knitted products could not be conventionally dried and dye-fixed with hot flutes.

  According to the invention, it has been proposed to cure only the edge regions which are narrow with respect to the full width of the product web, with stabilizing lines or similar stabilizing means. Surprisingly, with only the hardening of the narrow edge region, the knitted product web no longer curls into strands with the hot flutes, but passes through the hot flutes as woven product webs. . In this case, it is advantageous that the glue stripes at the product web edge are not consistent and fragmented. For example, one length unit of the horizontal line glued in the direction of travel of the product web can be followed by approximately two length units of the non-glued area. In practice, a dimensional relationship of 1: 2 has proven to be advantageous.

  The width of the glue track, measured transversely from the product web edge to the direction of web travel, is related to the distance between the upper and lower rollers of the dyeing hot fluid according to the invention. The greater the spacing, the greater the width of the glued stripes must be selected to avoid curling or folding back of the cured edges on the path between the two rollers, respectively. Don't be. This edge rounding is prevented when the width of the glued stripe (glue length) measured from the product web edge is approximately 1/25 of the axial spacing of the upper and lower hot-fluid rollers in accordance with the present invention. Turned out to be. We want to choose a glued stripe width of at least about 1 cm.

  The smaller the longitudinal pulling force acting on the product web, the more the edge folds or rounds are avoided. Similarly, within the framework of the present invention, it is advantageous that the longitudinal pulling force acting on the product web is substantially uniform everywhere in the hot fluid, ie every product web loop. In order to achieve a uniform and slight product web longitudinal pulling force throughout the dyeing hot fluid, each individual upper roller is not driven together via a single chain drive- Alternatively, it is advantageous to drive each two or three rollers together (depending on the product quality) —with separate motors whose drive torque is adjustable.

  Within the framework of the present invention, the expression “drying and dyeing and fixing” means both fixing during drying as well as drying and subsequent fixing. Once the product web has been dried and secured, it can be wound up on a roll, for example via a belt transporter, as is common with knitted products, without being pulled in the longitudinal and width directions, or It is stacked on the stack via taffeta. As an alternative, the product web is first treated with a hot fluid for the purpose of fixing, washed by continuous transport in the production line, dried, and possibly unloaded in the longitudinal and width directions. You can also.

  In the following, the details of the invention will be described on the basis of an embodiment of the installation concept according to the invention for continuously dyeing a knitted product web at least partly composed of cellulose fibers as shown in the accompanying drawings.

  FIG. 1 is a schematic longitudinal cross-sectional view of the dyeing equipment taken along the vertical direction.

  FIG. 2 is a plan view of a part of the dyeing equipment shown in FIG.

  The product web 1 runs from the roll 3 in the conveying direction 2 (longitudinal direction of the product web) via the tentering device 4 to the tension frame 5 shown in principle in the plan view of FIG. The tension frame 5 has two tension chains 6 and 7, which tension chains 6, 7 are provided with needles 8 (possibly clips) for fixing the edge region 9 in the longitudinal edge 10 of the product web 1. Yes. Each tension chain is guided endlessly via a chain gear 11 (a chain gear having a horizontal or vertical gear shaft 12). When the product web 1 or its edge region 9 is secured to each tension chain 6, 7, the glue line is applied to the edge region 9 at the glue station 13. The length b of the glue horizontal line (seen in the direction transverse to the conveying direction 2) is smaller than the entire width B of the product web 1 and is 1/25 of the distance between the upper roller and the lower roller of the hot fluid described later. It is almost equal. The applied glue is cured at the edge drying station 14 following the transport direction 2. As a result, the edge region 9 loses the flexibility that the knitted product normally has and the product web 1 no longer curls after being released at the outlet 15 of the tension frame 5.

  The product web 1 is then brought via a guide roller 16 to a dyeing bath 17 having an immersion roller 18 and then to a dyeing hot-fluid inlet slit 20 indicated generally at 21. In the hot fluid 21, the product web 1 is guided via a turning roller 22 and in the form of a meander up and down through two guide roller sets 23 and 24. Each of the guide roller sets 23 and 24 includes a plurality of guide rollers, that is, a lower roller 25 and an upper roller 26. Inside the hot fluid 21, a product web stripe 27 stretched between the two guide rollers 25 and 26 of the roller sets 23 and 24 is loaded with air heated from the blow nozzle 28. At the end of the product web 1 guided in the hot fluid 21, the product web 1 reaches the traveling region 31 via the turning roller 29 and the exit slit 30. The run-out area 31 can have, for example, a support belt 32 that feeds the product web 1 to the roll 33 without applying tension in the longitudinal direction and the width direction.

The schematic longitudinal cross-sectional view which carried out the cross section in the perpendicular direction of dyeing | staining equipment. The top view of 1 part of the dyeing | staining facility shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Product web 2 Conveying direction 3 Roll 4 Widening device 5 Tension frame 6,7 Tension chain 8 Needle 9 Edge area 10 Longitudinal edge 11 Chain gear 12 Chain gear shaft 13 Gluing station 14 Drying station 15 Exit 16 Guide roller DESCRIPTION OF SYMBOLS 17 Dyeing bath 18 Immersion roller 19 Crushing part 20 Entrance slit 21 Dyeing hot fluid 22 Turning shaft 23, 24 Guide roller group 25 Lower roller 26 Upper roller 27 Product web stripe 28 Blow nozzle 29 Turning roller 30 Exit slit 31 Run area 32 Support belt 33 Roll

Claims (3)

A method for dyeing a knitted product web (1) containing cellulose, wherein the knitted product web (1) is bordered on the longitudinal edge (10) of the knitted product web (1) before dyeing. In the method of applying glue stripes to the edge region (9) of the fabric and curing it by drying, dyeing the knitted product web in a dyeing bath (17), then drying and dyeing and fixing in a dyeing hot fluid (21) ,
(B) the tentering at both web longitudinal edges (10) of the product web (1) which tends to curl,
(B) continuously tensioning the product web (1) by fixing both longitudinal edges (10) to a tension chain (6, 7) that continuously conveys,
(C) In the product web feed direction (2), apply a glue stripe in the shape of a glue horizontal line interrupted in the glue-free area, and the length of the glue horizontal line (from the product web edge to the transport direction transversely) The length measured) is 1/25 of the axial spacing between the upper and lower rollers (25, 26) of the dyeing hot fluid (21), but at least about 1 cm,
(D) Release the product web (1) from the tension chain (6, 7) before entering the dye bath (17),
(E) Designing a dyeing hot fluid (21) to guide the product web (1) with an equal product longitudinal tension of the size of 10 Newtons ± 5 Newtons,
A method for dyeing a knitted product web containing cellulose fibers, characterized by (a), (b), (c), (d), and (e).   2. The method as claimed in claim 1, wherein the dyeing hot flutes (21) are used with lower and upper rollers driven individually or in groups.   3. A method according to claim 1 or 2, wherein the glue line is-twice as large as the glue-free area as viewed in the product transport direction (2).

Images