EP0979985B1 - Apparatus for the heat treatment of a textile web - Google Patents

Abstract

The cylindrical jet has a jet opening at one end, and a funnel shaped entry at the other end, which transits into the jet box base. Equipment used to apply heat to piece goods (2) has jet boxes (29, 30) above and below the plane (9) of fabric travel. The jets, at the facing sides of the jet boxes (29, 30) are cylindrical jet units aligned at an angle to the base of each jet assembly. The cylindrical jet has a jet opening at one end, and a funnel shaped entry at the other end, which transits into the jet box base. The jet box base is flat, with the jets located in recesses in the base. Preferred Features: All the jet are aligned at an angle to the jet unit base. The jets of the upper and lower jet boxes (29, 30) are aligned against each other so that the fabric (2), moving along the center plane (9), is given an alternating bowed movement upwards and downwards, and across the fabric width. Each unit has four jets aligned at each other. The jets to the left and right of the longitudinal center line are aligned inwards to the center, above and below the fabric (2). The jets aligned across the direction of fabric travel alternate towards and away from each other with, in each case, paired jets in the same direction. The lateral jets spread the fabric in corrugations. The upper and lower jets are in alignment with each other, or they are offset from each other. The lateral jets are in rows, where the jets in adjacent rows in the movement direction are offset from those in the preceding row. Covers are fitted to match the width of the jet box working surfaces to the width of the fabric (2), as slides within the jet boxes. The jet openings can be flush with the flat surfaces of the jet box bases.

Description

The invention relates to a device for heat treatment a textile web according to the preamble of the claim 1.

Devices of this type are known from DE-C-43 06 584, the nozzles being formed by simple perforated nozzles become. This nozzle shape is in production relatively cheap, but has different ventilation Disadvantage. On the one hand, this causes the cross to the nozzle hole incoming air in the nozzle box that the air jet out the nozzle does not exit vertically but at an angle. To the others the jet is through the sharp edge of the hole constricted, causing a loss of pressure comes.

The webs are usually on their longitudinal edges held by means of tension and transport chains and transported through the device. The web will with width addition and if necessary lead in length in the stenter retracted. The web of goods therefore hangs in the beginning until the heat treatment turns into a progressive shrinkage that gradually leads to the Excess area consumes, so that at the machine outlet a flat web with the required dimensions is available stands.

For the most uniform possible heat treatment of the web however, it is desirable that the web also in the area of the first treatment zones of the device if possible in the area of a middle goods web transport level is held by the connection level is formed between the tension chains.

In DE-PS 23 39 964 this problem is solved solved that the web facing surfaces of the Nozzle boxes are formed by perforated plates, which in Cross direction are kinked several times and also in In the longitudinal direction an alternately different inclination compared to the middle web transport level. In this way, the web takes through from nozzle jets hitting the top and bottom both in A waveform in the longitudinal direction and in the transverse direction on. Through the diagonally aligned to the web transport level However, parts of the nozzle base can be only very limited changes in the direction of the jet cause. In addition, it comes down to the Subareas at particularly high pressure losses, which from the flow direction tilted away within a nozzle box are.

From DE-A-21 20 805 a device for hovering webs of goods on an air cushion known with the upper and lower nozzle boxes Inclined jet nozzles are formed, being in the transport direction of the product line nozzle boxes and as open Columns designed to discharge the air backflow channels successive, the Inclined jet nozzles are provided on both sides of each return flow channel are.

From US-A-4,551,926 a veneer dryer is known whose nozzle boxes have a large number of nozzles, which have a cylindrical part that is perpendicular to the Is aligned. The cylindrical part has a nozzle mouth at one end and has a funnel shape at its other end expanding, curved area on that in the nozzle bottom transforms. The nozzles are also in depressions of the nozzle bottom.

The invention is therefore based on the object Device for the heat treatment of a textile web to develop further in accordance with the preamble of claim 1, that heat treatment as uniform as possible reached the web with the lowest possible pressure loss can be.

According to the invention, this object is achieved by the features of claim 1 solved.

Further refinements of the invention are the subject of the dependent claims.

According to the invention, at least some nozzles are at the bottom of the nozzle slanted. The nozzles themselves point a cylindrical part that is oblique to the bottom of the nozzle is aligned, with the cylindrical part on its has one end of a nozzle mouth and at its at the other end a funnel-shaped, curved one Connects area that merges into the nozzle bottom. The nozzles are in wells of the just formed Nozzle bottom provided.

Through a targeted alignment of the nozzles of the upper one and lower nozzle boxes, the web can be so treat with treatment gas that the web both lengthways and crossways to the direction of transport spreads out in wave form. The nozzles of the top and lower nozzle boxes are preferably one another aligned that around the middle Goods web transport level alternately bulges after surrender below and above. The web of goods shows up to the viewer as "three-dimensional Mountain landscape ".

Due to the special design of the nozzle, the Flow at the funnel-shaped, curved area the nozzle so that there is a clear Direction of air flow results.

Characterized in that the nozzles in recesses of the nozzle bottom damage to the goods, especially "thread puller" in contact with the Avoid the bottom of the nozzle.

Find devices for heat treatment for drying and fixing textile webs. Because in practice, many different webs of goods They need to be treated broadly Tension chains with which the webs on their long edges be held sideways to adapt to the respective width of the web transverse to the direction of transport adjustable. The nozzle system is for the largest occurring width of the web is designed. During treatment of webs whose width is smaller than that maximum working width to be processed must be special Measures are taken to keep the air out that part of the nozzle system that does not have a web faces, not unused on the web flows past.

To this end, it is known to adapt the effective Air passage area to the width of the respective Provide web cover elements, each cover those nozzles that are not facing a web.

To ensure even loading of the web to reach partially covered nozzles, the Cover elements a reliable cover of not enable required nozzles. This can be done in particular then reliably realize when the nozzle bottom is just trained. The cover elements can both inside and outside the nozzle box to be ordered.

Other advantages of the invention will be now based on the description of some embodiments and the drawing explained in more detail.

Fig.1

eine schematische Aufsicht einer Vorrichtung zur Wärmebehandlung einer Warenbahn,

Fig.2

eine schematische Seitenansicht der Vorrichtung gemäß Fig.1,

Fig.3

eine Ansicht des Düsenbodens eines Düsenkastens,

Fig.4

eine Schnittdarstellung längs der Linie IV-IV der Fig.3,

Fig.5

eine Schnittdarstellung längs der Linie v-v der Fig.3,

Fig.6 und 7

Schnittdarstellungen von Düsen gemäß weiteren Ausführungsbeispielen,

Fig.8 bis 23

schematische Darstellungen von verschiedenen Ausführungsbeispielen hinsichtlich der Ausrichtung der einzelnen Düsen der oberen und unteren Düsenkästen.

Show in the drawing

Fig.1

1 shows a schematic top view of a device for the heat treatment of a web,

Fig.2

2 shows a schematic side view of the device according to FIG. 1,

Figure 3

a view of the nozzle bottom of a nozzle box,

Figure 4

2 shows a sectional illustration along the line IV-IV of FIG. 3,

Figure 5

3 shows a sectional illustration along the line vv in FIG. 3,

Fig. 6 and 7

Sectional representations of nozzles according to further embodiments,

Fig. 8 to 23

schematic representations of various embodiments with respect to the alignment of the individual nozzles of the upper and lower nozzle boxes.

1 and 2 is a device 1 for heat treatment, especially for drying and / or fixing, a textile web 2 shown. The web 2 is spread over a wide range during this heat treatment Condition continuous through the device 1 transported through.

The device 1 contains a machine housing in the usual way 3, in its longitudinal direction in several Treatment zones can be divided and at his one end a web inlet 4 and at its other End of a web run 5 - each in about Form of a transverse slot - has. The Material web 2 is thus in during its heat treatment Longitudinally transported through the tensioner 1. The direction of transport is with arrow 6 (Fig.1) marked. As facilities for simultaneous Wide span and longitudinal transport of the web 2 are two only very schematically in the usual way indicated tensioning or transport chains 7, 8 are provided, those with clamps or needle bars like this are equipped that the web 2 on their two Longitudinal edges 2a, 2b are detected and held can.

The transverse connection plane between the two Transport chains 7, 8 (in the holding area of the longitudinal edges of the web) is referred to below as the middle goods web transport level 9 designated. In the shown in Fig.2 Embodiment is the web 2 exactly in the middle web transport level 9th

On at least one side of the web transport level 9 and at a suitable distance from this are nozzle devices 10 in the form of inflatable nozzle boxes tempered gases, in particular from warm air to the arranged web side facing them. Im illustrated Embodiment are on both sides the web 2 or the middle web transport level 9 nozzle boxes in the form of an upper nozzle box 20 and a lower nozzle box 30 are provided, wherein to this nozzle device 10, a blower 11 for generation air circulation and at least one control flap 12 belong to each side of the web a treatment gas in a required, adjustable or controllable amount to be able to supply. Of course can instead use the upper and lower nozzle boxes a separate fan can be assigned, by controlling its speed the corresponding one Air volume can be regulated.

The location of the web 2 is essentially by the Tension or transport chains 7, 8 and the amount of determined by the inflated gases 10 gases. The following is influencing the situation the web 2 through the nozzle devices considered.

3, 4 and 5 is the upper nozzle box 20 shown. He is considered elongated, different from that Inflow side tapered in height, the one nozzle bottom 21 with a variety of Has nozzles 22. The arrow 23 in Fig.4 shows the Direction of the air flowing into the nozzle box 20 on.

The nozzles 22 are in rows transverse to the transport direction 6 arranged, the nozzles of a row each have the same distance from each other. In the illustrated 3 are the nozzles of the slightly offset in the transport direction 6 adjacent row arranged to the previous row.

The lower nozzle box 30 is in a corresponding manner built up.

6 shows the nozzle 22 according to a first embodiment in detail. Each of the nozzles 22 is in a recess 21a of the nozzle base 21 is formed. The nozzle has a cylindrical part 22a, on its one end of a nozzle mouth 22b is formed and itself at the other end a funnel-shaped, curved region 22c connects into the nozzle bottom 21 passes. The nozzle mouth 22b is opposite to that just formed nozzle bottom 21 into the recess 21a arranged withdrawn so that, if necessary, on the nozzle bottom 21st adjacent material webs not in contact with the nozzle mouth can come and be damaged.

The peculiarity of the nozzle 22 is that it is aligned obliquely to the nozzle bottom 21. The alignment the nozzle is made by the orientation of the cylindrical Determines part 22a, whose central axis 22d with the nozzle base 21 encloses an angle α <90 °. The special effects associated with such a nozzle with regard to the web 2 can be achieved illustrated in more detail with reference to FIGS. 8 to 23.

In the nozzle 22 shown in Figure 6 is in the Drawing shown upper edge of the curved area 22c in a plane 22e that is parallel to the nozzle mouth 22b and aligned parallel to the nozzle base 21 is. The central axis 22d of the cylindrical part 22a is therefore not perpendicular to the plane 22e or plane formed by the nozzle mouth 22b.

The nozzle 22 'shown in Figure 7 according to a second The embodiment differs from the nozzle 22 according to Figure 6 only by the fact that by the upper Level 22'e formed at the edge of the curved region 22'c and the nozzle mouth 22'b arranged parallel thereto perpendicular to the central axis 22'd of the cylindrical part 22'a are aligned.

Various exemplary embodiments are now shown in FIGS shown how the nozzles of the top and bottom Nozzle boxes can be aligned and which Effects arise. The view shows a each a very schematic side view of the upper and lower nozzle boxes 20, 30 with the one in between aligned web 2. The nozzles 22 and 32 and in particular their orientation are in this View shown with the help of arrows.

8b shows the nozzle bottom of the upper nozzle box 20, while in Fig.8c the bottom of the lower nozzle box 30 is illustrated. In both figures are the nozzles 22 and 32 are represented by simple circles, the alignment of the nozzles by small flags is indicated.

The longitudinal median plane is also in all three views 13 of the web 2 shown. The design of the Nozzles in the exemplary embodiments explained in more detail below is not on the variant shown in Fig.6 limited. In particular, nozzles can also be used 22 'according to FIG. 7 or completely different nozzles are used, at least some of the nozzles of a nozzle box aligned obliquely to its nozzle bottom are.

In Fig. 8, the right and left of the longitudinal center plane 13 of the web 2 and above or below the nozzle arranged opposite the nozzle bottom aligned to the longitudinal center plane of the web. This will make the wet shrink textile web, especially in the first treatment zones the device. In the direction of transport 6 of the web, the nozzles are arranged in alignment. The upper and lower nozzle box nozzles 20, 30 are also congruent with each other.

The nozzle arrangement according to FIG. 9 essentially corresponds of the nozzle arrangement according to FIG. 8. The in the direction of transport 6 aligned nozzles of the upper nozzle box 20 are only half a hole pitch shifted transversely to the transport direction. This will make the Material web across the direction of transport in a light Wavy line offset what the quality of the goods from The advantage is (see Fig.9a).

The arrangement of the nozzles according to that shown in Fig.10 The embodiment again corresponds to the embodiment 8 with the difference that the Nozzle holes in the neighboring 6 in the transport direction Row of nozzles arranged offset from the previous row are. This arrangement is especially for more even drying on more sensitive webs advantageous.

11 differs from of the nozzle arrangement according to FIG. 10 only in that the nozzles of the upper nozzle box as a mirror image the nozzles of the lower nozzle box are arranged, wherein the middle row of nozzles in the direction of transport 6 Mirror axis 24 forms.

The nozzle arrangement according to FIG. 12 corresponds to the arrangement 10, but with the nozzles of the upper Nozzle box 20 by half a hole division across Transport direction 6 opposite the nozzles of the lower nozzle box 30 are shifted.

The nozzles according to Fig. 13 are according to the embodiment arranged according to Fig.11, the nozzles the upper nozzle box 20 by half a hole pitch are moved transversely to the transport direction 6.

In the exemplary embodiment according to FIG. 14, the nozzles of the upper and lower nozzle box 20, 30 both in and also in alignment with one another transversely to the direction of transport 6 arranged. The cross to the direction of transport of the web side-by-side nozzles are alternating facing and away from each other. The nozzles in the direction of transport each have the same orientation. With Such an arrangement creates a wavy exposure the textile web.

In Fig. 15 the nozzles according to Fig. 14 are in the transport direction neighboring row slightly offset from the previous one Row arranged.

In Fig. 16, the nozzle arrangement corresponds to the upper nozzle box 20 of the nozzle arrangement of the upper nozzle box according to Fig.15b. The nozzles of the lower nozzle box 30 according to FIG. 16c are mirrored around the middle row of nozzles arranged.

17 corresponds to the nozzle arrangement 15, wherein the nozzles of the lower nozzle box 30 are arranged identically and the nozzles the upper nozzle box by a hole division across Transport direction 6 are shifted, this creates a wavy load on the textile web.

According to Fig. 18a are four nozzles each of the upper and lower nozzle boxes inclined towards each other. This creates a "hilly" loading of the textile web. The facing each other and away from each other Nozzles are in the upper and lower nozzle boxes 20, 30 congruent.

The nozzle arrangement according to FIG. 19 corresponds to the nozzle arrangement according to Fig. 18, but with the to and from each other away directed nozzles in the transport direction 6 and transverse to the direction of transport at the upper nozzle box 20 are shifted by a hole pitch. This will make the "Hilly" loading of the textile web reinforced.

The "hilly" formation of the web, in which alternating around the middle web transport level Bulges up and down is in Fig.19d shown schematically.

The nozzles shown in Fig. 20 are mirror images arranged to the nozzles according to Fig.18, whereby a little other "hilly" loading of the textile web is achieved.

Yet another "hilly" exposure to the textile Goods web can be achieved according to Fig. 21 if the nozzles of the lower nozzle box 30 around the middle row across Direction of transport reflects.

The nozzles in Fig. 22 are inclined so that of the transversely to the direction of transport of the web side by side arranged nozzles alternately two in each one and two nozzles aligned in the other direction are. This in turn creates a wavy one Loading of the textile web, the shaft spacing however, are larger than in the Aua leadership example according to Fig. 17.

23 corresponds to the arrangement according to Fig. 22, the nozzles of the lower nozzle box are arranged in mirror image.

As the above exemplary embodiments show, this offers Interplay of diagonally aligned to the nozzle bottom Nozzles various ways to close the web apply. Especially in the area of the first treatment zones the device becomes a wavy exposure prefer the web, while at the web outlet, where the shrinkage of the weft threads already has expired, aligns the nozzles so that the Goods web essentially in the middle web transport level is held.

In practice, material webs often have to be different Wide heat treated so that the tension chains, with which the material webs on their longitudinal edges be held sideways to adapt to the respective Width of the material web across the direction of transport are adjustable. The nozzle system is for the largest occurring width of the web is designed. During treatment of webs whose width is smaller than that maximum working width to be processed must be special Measures are taken to keep the air out that part of the nozzle system that does not have a web faces, not unused on the web flows past.

For this purpose are in the embodiment shown in Figure 4 Cover elements 14 provided to the effective air passage area to the width of the respective Adjust web. The cover elements can from a single slider or from several individual ones Cover elements exist, which are suitable for Controlled change in the effective air passage area become.

The cover elements are expediently inside the nozzle boxes arranged, but can also outside of the nozzle box in the area of the nozzle base be like that in Fig. 4 with dashed lines is indicated. Due to the flat design of the nozzle base 21 can be done in a particularly simple manner reliable coverage of the nozzles not required realize. With an external attachment of the cover elements these are directly on the nozzle bottom 21 guided. When attaching the cover elements 14 in Inside the nozzle boxes, these come with the curved ones Areas 22c of the nozzles 22 in contact. But here too lies the upper edge of all curved areas of the nozzles 22 on a common level and thereby ensure reliable coverage of those not required Nozzles.

Claims (14)

1. Apparatus for the heat-treatment of a textile fabric web (2), having nozzle boxes (20, 30) arranged above and below a central transport plane (9) of the fabric web, each nozzle box comprising a nozzle plate (21) facing the fabric web and having a plurality of nozzles (22, 22'), at least some of the nozzles being oriented obliquely to the nozzle plate, and the nozzles of the upper and lower nozzle boxes (20, 30) being oriented towards one another in such a manner that upward and downward bulges alternating about the central transport plane (9) of the fabric web are produced in the fabric web (2),
   characterised in that

   the obliquely oriented nozzles have a cylindrical portion (22a) which is oriented obliquely to the nozzle plate and

   the cylindrical portion (22a) has, at one end thereof, a nozzle mouth (22b) and, adjoining the other end thereof, a curved region (22c) which becomes wider in a funnel shape and which leads into the nozzle plate (21), and

   the nozzle plate (21) is flat and the nozzles (22, 22') are formed in depressions (21a) of the nozzle plate.
2. Apparatus according to claim 1, characterised in that all the nozzles are oriented obliquely to the nozzle plate.
3. Apparatus according to one of the preceding claims, characterised in that the bulges form both lengthways and transversely to the transport direction.
4. Apparatus according to claim 1, characterised in that in each case four nozzles are inclined towards one another.
5. Apparatus according to claim 1, characterised in that the nozzles arranged to the right and left of the longitudinal central plane (13) of the fabric web (2) and above and below the fabric web are inclined relative to the nozzle plate towards the longitudinal central plane of the fabric web.
6. Apparatus according to claim 1, characterised in that the nozzles arranged one beside another transversely to the transport direction (6) of the fabric web (2) are oriented alternately towards and away from one another.
7. Apparatus according to claim 1, characterised in that, of the nozzles arranged one beside another transversely to the transport direction (6) of the fabric web (2), alternately at least two nozzles in each case are oriented in the one direction and the same number of nozzles are oriented in the other direction.
8. Apparatus according to any one of the preceding claims, characterised in that the nozzles of the upper and lower nozzle boxes (20, 30) are oriented towards one another in such a manner that the fabric web (2) extends in a wave shape transversely to the transport direction (6).
9. Apparatus according to any one of the preceding claims, characterised in that the nozzles of the upper and lower nozzle boxes (20, 30) are in register with one another.
10. Apparatus according to any one of the preceding claims, characterised in that the nozzles of the upper and lower nozzle boxes (20, 30) are offset from one another.
11. Apparatus according to any one of the preceding claims, characterised in that the nozzles are arranged in rows transversely to the transport direction (6), the nozzles of an adjacent row in the transport direction being arranged offset from the preceding row.
12. Apparatus according to any one of the preceding claims, characterised in that masking elements (14) are provided for adapting the effective air passage area of the nozzle plate (21) to the width of the respective fabric web (2).
13. Apparatus according to claim 12, characterised in that the masking elements (15) are constructed in the form of slides and are arranged inside the nozzle boxes.
14. Apparatus according to claim 1, characterised in that the nozzles (22) have a nozzle mouth (22b) that lies in the plane of the nozzle plate (21).

Images