EP0725178B2 - Method and device for drying and shrinking of textile fabric - Google Patents

Description

The invention relates to a device for continuous Drying and shrinking of textile mesh or Woven fabric according to the preamble of the claim (see DE-A-29 27 974).

There are already procedures for continuous drying and shrinking of textile mesh or woven fabric known, but all have the disadvantage that the product thus treated mostly uneven warped and / or curled, and thus then an additional relatively expensive Treatment must be subjected.

The object of the present invention is in particular the creation of a device which this Disadvantage, i. in their application extremely dimensionally accurate webs with improved Uniformity of the web structure produced are.

This object is achieved in a device of the initially mentioned type according to the invention according to the Characteristics of claim 1 solved.

Advantageous further developments of the inventive Driving are the subject of the claims 2 to 4.

Fig. 1 einen Längsschnitt durch eine beispielsweise Ausführungsform einer erfindungsgemässen Vorrichtung;

Fig. 2 in größerem Maßstab einen Schnitt längs der Linie II-II in perspektivischer Darstellung;

Fig. 3 in größerem Maßstab eine perspektivische Ansicht der Warenbahn-Breitdehnvorrichtung A in Figur 1;

Fig. 4 schematisch eine Draufsicht auf die oberen Trums einer unteren Führungsbandeinheit einer zweiten beispielsweisen Ausführungsform einer erfindungsgemässen Vorrichtung;

Fig. 5 schematisch eine perspektivische Ansicht einer die gleichmäßige Verschmälerung der Warenbahn unterstutzenden Warenbahn-Abstütz- und Transporteinheit;

Fig.6 schematisch eine Seitenansicht eine weitere beispielsweise Ausführungsform der Führungsbandeinheiten einer erfindungsgemässen Vorrichtung; und

Fig. 7 in größerem Maßstab einen Querschnitt durch eine spezielle Ausführungsform der Heissluftdüsen.

The invention will be explained with reference to the drawing, for example. It shows

1 shows a longitudinal section through an example embodiment of an inventive device.

Figure 2 on a larger scale a section along the line II-II in a perspective view.

Fig. 3 on a larger scale a perspective view of the web broad expander A in Figure 1;

4 schematically shows a plan view of the upper runs of a lower guide belt unit of a second exemplary embodiment of a device according to the invention;

5 schematically shows a perspective view of a uniform narrowing of the web-promoting web support and transport unit;

6 is a side view of a further example embodiment of the guide belt units of a device according to the invention; and

Fig. 7 on a larger scale a cross section through a specific embodiment of the hot air nozzles.

As can be seen from FIG. 1, the process to be treated is carried out moist web 1 within an intermediate two endlessly circulating, air-permeable guide straps 2 and 3 formed flow channel 4 for bilateral Charging and drying by three successive trained in a known manner Drying stations 5,6 and 7.

These drying stations 5,6 and 7 are on known manner with laterally distanced from each other, directed against the flow channel 4 to hot air nozzles 8 respectively 9 provided, which are transverse to the transport direction D of the fabric web to be treated 1 over the entire width of the two guide belts 2 or 3 extend.

To achieve a wave motion in the the flow channel 4 moved, to be treated Web 1 are the upper hot air nozzles 9 in the transport direction D seen this web 1 opposite the lower hot air nozzles 8 arranged offset.

The exiting through the hot air nozzles 8 and 9 Hot air is after the impact on the zu treating web 1 via the air filter 10 and the Heat exchanger 11 sucked by the fans 12 and reheated the respective hot air nozzles 8 and 9 supplied.

As in particular from FIGS. 1, 2 and 3 can be seen, the moist web to be treated 1 to achieve a uniform as possible Stretch across its entire width first a Breitendehnvorrichtung A and then an endlessly circulating, in the blowing direction at a distance through the Passage channel 4 moving forward clamping frame 13th fed and with advance at the point B by pinning attached to the clamping frame 13.

The Breitendehnvorrichtung A is, as shown in FIG. 3 apparent, in a known manner with two circumferential, between them an expansion gap forming groove rollers 14th and 15 provided. After this Breitendehnvorrichtung A is the web over several spreading rollers a pincushion B supplied.

After the lateral needling of such wide-stretched Web 1 by means of the pincushion B in the clamping frame 13 is the wide-stretched Goods 1 from a starting width F (see Figure 5) considered by means of a in the web support level C. tapered, except for the desired Treatment width H narrowing, over the entire respective web width G laterally extending web support and transport unit 30, always sideways through the endless encircling, also analogous conically narrowing Clamping frame 13 held and up in transferred the inlet of the dryer 5,6,7.

In this way, when narrowing the Web width F fed to the in the dryer 5,6,7 Treatment width H as uniform as possible Goods web exit structure achieved since the Web 1 in their narrowing on the top Trums the endless circulating transport sides 31 rests and the latter thereby a uniform narrowing the web 1 over the entire support varying width G.

As can be seen from Figure 2, the endlessly circulating Clamping frame 13 for lateral fixation to be treated web 1 with needles 16 or 17 provided, formed by each an endless chain left side and right-hand web support 18 and 19 on, whose rotational speed for alignment the weft direction is individually controllable.

In the illustrated embodiment (which contrary to the wording of claim 1 only a guide and cover channel shows) becomes a the two endless chains 18 and 19 in the interior of the Passage channel 4 to prevent damage of the upper guide band 2 through the needles 17 by a longitudinal direction of the guide channel. 4 extending guide and cover channel 20 guided. Here are the two web supports 18 and 19 for adjusting the clamping frame 13 at a certain web width in the lateral direction E adjustable. Of course it is also possible, the Web support 18 within an analogous to 20 Guide and cover channel between the top and pass the lower guide band 2 and 3 respectively.

The guide and cover channel 20 is in vertical Direction of the upper and lower guide band 2 or 3 supported, and at its with the latter in Touching bodies 21 and 22 with friction reducing Material, such as Teflon®, coated.

Through this lateral guidance of the to be treated Web 1 by means of a running through the dryer, endlessly revolving clamping frame 13, can one concerning the structure, dimensional stability and Dimensional stability Extremely uniform end product be achieved.

For example, at a warped web 1 the Weft direction or the mesh on a vertical to the web longitudinal direction extending straight align, and / or on the web width seen to achieve a more homogeneous end product a different compression or stretching effect it is possible, as can be seen from FIG. 4, instead of a single lower and upper guide band 3 or 2 several narrower guide bands 3 ', 3 "and 3'" provide and their Circulation speeds v1, v2 or v3 individually with Help an opto-electronic web scanning as they are e.g. from the company Mahlo, FRG, or Erhard & Leimer, Germany, is available.

To the compression or stretching of the treated Web 1 targeted to a specific Being able to perform density is like that of FIG. 5 also possible, instead of a single one lower and upper guide band 3 or 4 several, successive independent leader groups 2a, 3a; 2b, 3b and 2c, 3c provide and their rotational speeds v1, v2 and v3, respectively individually in groups with the help of an opto-electronic To control fabric web scanning arrangement.

To the Krumpfwirkung in the Krumpfzone of It is useful if, as 7, the outflow direction I of the hot air nozzles 8 and 9 in this zone against the web passage direction D by an angle α in the range from 1 to 40 ° inclined relative to a vertical varläuft. The blowing strength and the inclination angle α are to match each other in such a way that during operation no significant shift in the two Guide straps 2 and 3 in places resting Goods web areas done. Through such training the hot air nozzles 8 'and 9' in the Krumpfzone of the dryer can be compared to the conventional vertical Arrangement of the hot air nozzles an essential Reinforcement of the impact on the respective guide band 4 and 3 on the material to be treated 1 acting compressive force can be achieved.

Claims (4)

1. An apparatus for the continuous drying and shrinking of textile knitted or woven good, having at least one drying station (5, 6, 7) comprising several oppositely disposed and oppositely acting hot-air nozzles (8, 9) which are offset relative to each other and directed into a through-channel (4) and also having at least two endless rotating, air permeable guide belts (2, 3) limiting said channel (4) above and below, whereby for conveyance of a web (1) of material to be treated through the at least one drying station (5, 6, 7) an endless rotary web-tentering frame (13) passing along the through-channel (4) limited by the guide by the guide belts (2, 3) is provided, and the vertical distance between said web-tenter frame (13) and the lower strand of the at least one upper guide belt (2), as also between the upper strand of the at least one lower guide belt (3) is so calculated that, as the apparatus operates, within the particular effective range of a hot-air nozzle (8, 9) directed thereon, a web (1), in a locally limited area, secured in and conveyed by the web-tenter frame (13), comes into contact with the further distanced guide belt (3, 2), and the supply means (A, B) conveying the web (1) to be treated to the tenter frame are so designed as to secure the material (1) with forward slip to the tenter frame, characterised by that the drying station (5, 6, 7) is provided with hot-air slit nozzles (8, 9) extending over the entire width of the material (1) to be treated, and that the lower and/or upper guide belt (3, 2) moves on at greater speed than that of the tenter frame (13), and that the left-hand and right-hand web-clamping means (18, 19) of the tenter frame (13) comprise an endless chain carrying needles (16, 17) or tenter clips, and in that both chains (18, 19) are conveyed through a guide and covering channel (22, 23) within the through-channel (4) and extending in longitudinal direction of said channel (4), and which is supported in vertical direction on at least one of the upper and lower guide belts (2, 3).
2. An apparatus according to claim 1 characterised in that a width-stretching device (A) for treatment of the web is mounted before the tenter frame (13) which device (A) is provided with at least two rollers (14, 15), one (14) of which has on its periphery a relief comprising a plurality of elevations and depressions, whilst the other (15) has on its periphery an at least approximately complementary relief whose elevations fit into the depressions of the aforementioned roller (14).
3. An apparatus according to one of the claims 1 and 2, characterised in that the mutual distance apart (K) of the two guide belts (2, 3) limiting the through-channel (4) in vertical direction is adjustable.
4. An apparatus according to one of the claims 1 to 3 characterised in that the efflux direction (I) in at least a part of the shrinking zone of the apparatus is directed obliquely counter to the direction of travel (D) of the web and at an angle (α) in the region of 1° - 40° to the vertical, and in that the blower strength and the angle of inclination (α) are co-ordinated in such a manner that, in practice, no significant displacement at any point occurs of the web portions in contact upon the two guide belts (2, 3).

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