EP0437755B1 - Apparatus for drying a warp of yarns - Google Patents

Description

The invention relates to a device for drying a running sheet of thread wetted with size or dye, in which the optionally divided thread sheet is wetted and squeezed, then fed to a pre-dryer consisting of heating cylinders arranged in pairs and finally optionally dried after reunification. In the present context, the term "wetting" with sizing or dye means any type of application, e.g. Soaking or spraying, the liquid substance to be dried then understood.

A dryer in which the thread sheet is impregnated after a two-fold division and after the impregnation following a squeezing unit is divided again twice, i.e. a dryer with a four-fold division and two wetting points, in particular with two the size or the trough containing the dye with a subsequent squeezing mechanism has been introduced in practice. A corresponding arrangement is described in DE-A 32 02 923. Here, two pairs of heating cylinders lie vertically one above the other in two approximately horizontal planes. The thread sections are fed to the cylinders along a plane lying between the two pairs of heating cylinders. This results in an approx. 2 m long path between the crushing unit and the first contact with a heating cylinder. On this relatively long route in Nassfeld the individual threads can be twisted because of their relatively large lateral freedom of movement. Since the two pairs of rollers are arranged behind the respective squeezing mechanism in the running direction of the thread sheet, this results in a space-consuming construction. If measuring devices, warp partial bars and smoothing bars are to be accommodated between the crushing unit and the drying cylinder, the above-mentioned distance must be extended by at least 500 mm.

An arrangement in which the two pairs of heating cylinders are arranged in a common plane above the crushing unit requires less space. In this case, however, a symmetrical structure, i.e. equal treatment of the two thread cords guided to the pairs of heating cylinders, can only be achieved with the aid of additional deflecting rollers, so that the path to be traveled from the squeeze mechanism to the first contact with the predrying device also remains relatively long.

Finally, attempts have already been made to store the two pairs of heating cylinders in two vertical levels next to one another above the crushing unit. As a result, the space requirement on the floor is reduced compared to the aforementioned arrangements, but the overall height increases considerably. In addition, the path to be traversed from the exit of the crushing unit to the casserole on the first heating cylinder of the respective thread section is greater than in the device provided according to DE-A 32 02 923. Finally, a deflection roller is required between the squeeze unit and the pre-dryer cylinders, or a squeeze unit with horizontally arranged rollers must be used.

The conventional dryers of the relevant type ultimately work with a four-fold division in the pre-dryer area, but the thread sheet must be divided a first time before wetting or soaking, so that two wetting points with squeezing mechanism are required. A fourfold division between the squeezing mechanism and predrying would only increase the aforementioned space and bleaching problems in the prior art devices.

The invention has for its object to provide a dryer for four-fold division in the pre-dryer area so that with a substantially symmetrical guidance of the thread sections between the exit of the squeeze mechanism and the first emergence on a pre-dryer in a compact and low design with a minimal short distance in the directly after the squeeze unit is possible. In particular, the arrangement should allow an extension of the final dryer or the interposition of additional drying cylinders.

The solution according to the invention for the device mentioned at the outset is that the heating cylinder pairs are in the same horizontal or vertical plane and the individual heating cylinders are located horizontally next to one another above the squeezing mechanism and vertically one above the other at the outlet of the squeezing mechanism, symmetrically with respect to a diagonal of the above-mentioned horizontals and Vertical are stored and that the outlet of the squeezing mechanism lies in the gusset spanned by the horizontal and vertical between the pairs of heating cylinders on the diagonal.

Preferably, the thread coulter is divided after wetting following a squeeze mechanism, each partial thread coulter thus formed is fed to a separate pre-dryer containing two heating cylinders, and the pre-dried partial thread coulters are reunited for the final drying.

The invention first enables largely symmetrical guidance of the thread sections with a minimally short distance in the wet field, because the heating cylinder pairs quasi around the squeeze mechanism on the Outlet side can be arranged. The resulting compact and low design allows the thread sheet to be divided four times between the wetting after predrying, and also to assign two horizontal heating cylinder pairs one above the other and two vertical heating cylinder pairs next to each other to the diagonal or the deflection rollers arranged there. In this way, a four-fold pre-drying is possible after a single wetting point. If the wetting is then preceded by a division and two wetting points were used accordingly, an eight-fold division would result in the area of the predrying.

According to a further invention, it is preferred to provide a division of the thread sheet before wetting and a second division after the squeezing, which may be due to the wetting, and accordingly a first pair of heating cylinders in a horizontal plane above each crushing unit and a second pair of heating cylinders in a vertical plane at the outlet of each To store crushing mechanism.

This initially enables a completely symmetrical guidance of the thread sections with a minimally short distance in the wet field, because the heating cylinder pairs are arranged virtually around the squeezing mechanism on its outlet side. The resulting compact and low design has an additional advantage because it also allows intermediate driers to be arranged in the area above the nip roller pairs without the overall height being greater than previously without such intermediate driers.

Improvements and further refinements of the invention are specified in the subclaims. In this context, it should be pointed out in particular that despite the minimally short distance between the outlet of the squeeze mechanism and the point of impact, the pre-dryer in the gusset on both sides of the diagonal there is sufficient space for conventional measuring devices, smoothing rods and wet-section rods. This gusset is so large that it also allows easy handling of the devices and rods. The shortness of the distance between the outlet of the squeeze mechanism and the run-on point on the downstream pre-dryer limits the lateral freedom of movement of the individual threads of each group of threads in such a way that cords cannot occur. The short diagonal path also practically precludes premature and uneven drying when the machine is at a standstill, since the two sets of threads are guided at a sufficient symmetrical distance from the heating cylinders.

If two or more horizontal and vertical heating cylinder pairs are provided, two alternatives of mutual association of the heating cylinder pairs are preferred within the scope of the invention: In the first alternative (series connection), the thread groups run in the diagonals mentioned, along which the threads of the heating cylinder arrangement are fed essentially rectified in parallel. In the other alternative (counter-switching), the diagonals are at an angle to one another, so that the coulters of thread run towards one another in a correspondingly directed manner. The two alternatives can also be defined by the orientation of the gussets spanned by the heating cylinder pairs: in the first case the gussets open in the same spatial direction, in the other case the gussets are spatially directed away from each other.

• Fig. 1 eine Reihenschaltung mit je einer 2-fach-Teilung vor und nach dem Benetzen;
• Fig. 2 eine Vorrichtung mit 4-fach-Teilung nach dem Benetzen;
• Fig. 3 eine Konterschaltung mit 2-fach-Teilung vor dem Benetzen; und
• Fig. 4 eine Konterschaltung mit je einer 2-fach-Teilung vor und nach dem Benetzen.

Details of the invention are explained on the basis of the schematic representation of exemplary embodiments. Show it:

• 1 shows a series connection, each with a double division before and after wetting.
• Figure 2 shows a device with 4-fold division after wetting.
• 3 shows a counter circuit with a double division before wetting. and
• Fig. 4 is a counter circuit with a double division before and after wetting.

According to Fig. 1, it is provided that a group of threads coming from not shown slip trees or the like is divided into two partial thread groups 1 and 2, each with a wetting agent, e.g. Sizing or dye containing trough 3 and 4 lead and to pass on to the trough via a squeezer 5 and 6. After the crushing mechanism 5 and 6, the two sets of threads 1 and 2 are divided again with the help of wet part rods 7 and 8, so that part thread sets 9 and 10 or 11 and 12 are formed. These thread sections 9 to 12 each run approximately along a diagonal 13 and 14 on a pair of heating cylinders 15 and 16 or 17 and 18.

1, the trough 3, 4, the squeezing mechanism 5, 6, the wet-section rods 7, 8 and the heating cylinder pairs 15 to 18 follow one another spatially in one direction, for example from left to right. The two diagonals 13 and 14 accordingly run essentially parallel to one another. In contrast, in the devices discussed below with reference to FIGS. 3 and 4 with a so-called counter-switching, it is provided that the thread groups run towards one another from two sides, so that there are two spatially opposite sequences of immersion trough, squeeze rollers and heating cylinder pairs and that the two diagonals mentioned are not parallel to one another, but rather obliquely, like the legs of an isosceles triangle, are directed towards one another or are opposed to one another.

In the series connection according to FIG. 1, the thread sections 9 to 12 run from the heating cylinder pairs 15 to 18 each via a union roller 19 and 20 to a final dryer, designated overall by 21, which in the exemplary embodiment consists of four heating cylinders 22 to 25. The reunited threads in the final dryer 21 run over a deflecting roller 26 as a completely dried thread sheet 27, e.g. to an undrawn warp beam, further.

The distance between the outlet 28 of the squeeze unit 5 or 6 and the run-up point 29 on one of the pairs of heating cylinders 15 to 18 of the pre-dryer can be kept to a certain extent "around the squeezing unit 5, 6" due to the arrangement of the pairs of heating cylinders 15 to 18, but remains the area of the gusset on both sides of the diagonals 13 and 14 is easily accessible for interventions, for example for inserting and checking conventional measuring devices, wet-section bars or smoothing bars. The space between the two pairs of heating cylinders 15 and 16 or 17 and 18 is so well closed that premature drying when the machine is at a standstill is normally not to be expected.

Since only two vertically superimposed heating cylinders 16 are arranged between successive crushing units 5 and 6, the length of the device according to the invention can be kept to a minimum. Furthermore, since only one level of drying cylinders is provided above each crushing unit, the height of the arrangement according to the invention also remains minimal. A major advantage of the invention is therefore that a minimally short wet field and a minimal length and height of the overall arrangement are possible at the same time will.

If further intermediate drying is required before the thread sheets 1 and 2 are combined to form the total thread sheet 27, 15 to 18 intermediate dryer cylinder pairs 30 and 31 can be provided above the heating cylinder pairs arranged in the gusset. In addition, the reunification of the thread coulters 1 and 2 subsequent to the intermediate dryer cylinders 30 and 31 can already take place on additional final dryer cylinders 32 which are connected upstream of the final dryer 21 in the direction 33 of the thread. In this way, a basic structure having twelve cylinders can be expanded to fourteen to twenty-four drying cylinders without exceeding the overall height and overall length occupied by known devices of this type.

For the compact construction according to the invention, only three vertical supports 34 to 36 and a cross member 37 lying thereon are required for receiving the bearings of the heating cylinders 15 to 18 and 22 to 25 in the 12-cylinder arrangement. As a result, the structure essential to the invention is achieved with a horizontal plane 38 and a vertical plane 39 or 40 for the two interacting pairs of heating cylinders 15/16 or 17/18 of the predrying device. The horizontal plane 38 adjoins the vertical planes 39 and 40 in each case an approximately rectangular gusset 41 or 42, within which the respective wetting device with trough 3, 4 and squeezing mechanism 5, 6 is arranged. The heating roller pairs 15 and 17 of the pre-dryer, designated 43 in the horizontal plane 38 on the horizontal cross member 37, are preferably in the described twelve-cylinder arrangement at the same height above the floor 44 as the upper rollers 22, 23 of the final dryer 21.

Depending on the size of the trough, the installation spaces for the intermediate dryer 30 and 31 can be shortened, with a subsequent expansion of the predrying possibly having to be dispensed with. The final dryer can then also be placed directly next to the predrying cylinders 18 and equipped with four or six cylinders. This gives you a compact 12- or 14-cylinder dryer with 4-way warp pitch.

Fig. 2 relates to the case of a four-fold division of the thread sheet in the area between the wetting point and the pre-dryer. The final dryer can be designed similar to that in FIG. 1. In the exemplary embodiment shown, it is assumed that the thread cluster 53 fed to the squeeze mechanism 51 at the exit of the trough 52 (= wetting point) is divided four-fold within the gusset 54 defined above, for example on the diagonal 55 via partial rods 56, and that two horizontal heating cylinder pairs 57 and 58 one above the other and two vertical heating cylinder pairs 59 and 60 side by side form the pre-dryer. Of the partial thread groups 61 to 64 formed by the four-fold division, the groups 61 and 62 then run over the horizontal heating cylinder pairs 57 and 58, and the groups 63 and 64 over the vertical heating cylinder pairs 59 and 60. After predrying, they are on this looping path the thread sections 61 to 64, possibly with the interposition of deflection rollers 65, 66 as in FIG. 1, brought together again on a projecting roller 67 and, if necessary, passed to the final drying - as in FIG. 1.

While - as I said - Fig. 1 relates to a series connection with spatially substantially in the same direction supplying wetting aggregates, the case of a so-called counter-circuit is discussed with reference to Figs. 3 and 4, in which the wetting aggregates the treated sheet from two sides to one between deliver the acceptance line located to them. It is thereby achieved that the transport route from the exit of the predrying unit downstream of the wetting unit to the end dryer for the two wetting units is equal to.

3 and 4, the same or comparable parts as in the previous figures, in particular in Fig. 1, are designated. In the exemplary embodiment according to FIG. 3, a group of threads divided before wetting into two partial thread groups 1 and 2 is passed via guide rollers 71, 72 and 73, 74 into a trough 3, 4, there via an immersion roller 75, 76 by a wetting agent denoted by 77 or The same led and finally brought to a crushing 5, 6. Following the squeezing mechanism, the undivided thread bundle 1, 2 in the exemplary embodiment according to FIG. 3 runs approximately along the diagonally directed diagonals 78, 79 into the gusset 80, 81 described above and onto a pair of heating cylinders 18, 16 each. From there, the thread sections reach the other heating cylinder pairs 17, 15 via deflecting rollers 82, 83 and finally via a merging roller 84 to the final dryer 21. The latter can be constructed in the same way as in FIG. 1.

In the counter circuit described, the two diagonals 78, 79 in the gussets 80, 81 are roughly like the legs of an isosceles triangle or like the surfaces of a roof and meet on a line, approximately in the area of the union roller 84. While in the Series connection according to FIG. 1 of the trough 3, 4, the pair of squeeze rollers 5, 6 and the vertical plane 39, 40 in the given sequence in the same direction spatially follow one another in FIG. 3 (and FIG. 4) for the elements 4, 6 , 40 the spatially reverse order as provided for the elements 3, 5, 39. The two vertical planes 39 and 40 are therefore closer together than the crushing units 5 and 6, and especially the troughs 3 and 4.

In Fig. 4, a similar structure to that in Fig. 3 is provided, however each of the thread sets 1, 2 following the squeezing mechanism 5, 6, in principle, just as in FIG. 1, divided into two thread sets 9, 10 or 11, 12, so that the thread set 9 via the heating cylinder pair 15, the thread set 10 over the heating cylinder pair 16, the partial thread family 11 over the heating cylinder pair 17 and the partial thread family 12 over the heating cylinder pair 18 as well as all partial thread groups following the heating cylinder pairs 15 to 18 to the one unifying roller 84 and from there to the final dryer 21. An essential difference between FIGS. 3 and 4 is thus that each of the thread sections 1 and 2 divided again after the pinch mechanism 5, 6 and the lower thread sets run over a pair of heating cylinders to the unifying roller 84 and from there to the final dryer 21 .

With the help of the arrangement according to FIG. 3 it is also possible to work with a single wetting unit and undivided thread group. In this case, the group of threads coming from the first pre-dryer 16, 15 follows the roller 84 (union roller) in the dashed arrow direction 85 onto the cylinder of the second pre-dryer 18, 17 which then rotates in the opposite direction of rotation. In the arrangement according to FIG. 3 also possible to work wet-on-wet, i.e. to wet, pre-dry, rewet and pre-dry again. In this case, the undivided thread group coming from the first dryer runs through the roller 84 (merging roller) in the direction of arrow 86 under the second pre-dryer and via its trough 4 into the second pre-dryer.

Reference symbol list

1 =

Thread cluster

2 =

Thread cluster

3 =

trough

4 =

trough

5 =

Crushing mechanism

6 =

Crushing mechanism

7 =

Wet cutting bars

8 =

Wet cutting bars

9 =

Partial thread family

10 =

Partial thread family

11 =

Partial thread family

12 =

Partial thread family

13 =

diagonal

14 =

diagonal

15 =

Pair of heating cylinders

16 =

Pair of heating cylinders

17 =

Pair of heating cylinders

18 =

Pair of heating cylinders

19 =

Unification role

20 =

Unification role

21 =

Final dryer

22 =

Heating cylinder

23 =

Heating cylinder

24 =

Heating cylinder

25 =

Heating cylinder

26 =

Pulley

27 =

Total thread group

28 =

Output (5, 6)

29 =

Point of impact (15 to 18)

30 =

Intermediate drying cylinder

31 =

Intermediate drying cylinder

32 =

additional final drying cylinder

33 =

Running direction

34 =

support

35 =

support

36 =

support

37 =

Cross member

38 =

horizontal plane

39 =

vertical plane (16)

40 =

vertical plane (18)

41 =

gore

42 =

gore

43 =

Pre-dryer

44 =

ground

Fig. 2

51 =

Crushing mechanism

52 =

trough

53 =

Thread cluster

54 =

gore

55 =

diagonal

56 =

Partial bars

57 =

horizontal pair of heating cylinders

58 =

horizontal pair of heating cylinders

59 =

vertical pair of heating cylinders

60 =

vertical pair of heating cylinders

61 =

Partial thread family

62 =

Partial thread family

63 =

Partial thread family

64 =

Partial thread family

65 =

Pulley

66 =

Pulley

67 =

unifying role

3 and 4

71 - 74 =

Guide roller

75, 76 =

Dipping roller

77 =

Wetting agents

78, 79 =

diagonal

80, 81 =

gore

82, 83 =

Guide roller

84 =

Unification role

85 =

arrow

86 =

arrow

Claims (9)

1. Device for drying a continuous yarn bundle which is wetted with size or dye and in which the optionally divided yarn bundle (1, 2; 53) is wetted and squeezed, is then fed to a pre-drier consisting of heating cylinders (15 to 18; 57 to 60) arranged in pairs and is eventually finally dried, optionally after re-combination, characterised in that the pairs of heating cylinders lie in the same horizontal and vertical plane and the individual heating cylinders (15 to 18; 57 to 60) are mounted horizontally next to one another above the squeezing mechanism (5, 6; 51) and vertically above one another at the outlet of the squeezing mechanism (5, 6; 51) symmetrically with respect to a diagonal (13, 14; 55; 78, 79) of said horizontal and vertical and in that the outlet of the squeezing mechanism (5, 6; 51) lies in the gusset-like region (41, 42; 54; 80, 81), spread open by the horizontal and vertical, between the pairs of heating cylinders (15 to 18; 57 to 60) on the diagonals.
2. Device according to claim 1, characterised in that the diagonals (13, 14) lie substantially parallel to one another and in that the gusset-like regions (41, 42) are open in spatially the same direction (Figure 1).
3. Device according to claim 1, characterised in that the diagonals (78, 79) oppose one another obliquely substantially as the sides of an isosceles triangle and in that the gusset-like regions (80, 81) are open spatially away from one another (Figures 3 and 4).
4. Device according to at least one of claims 1 to 3, characterised in that each two pairs of heating cylinders are arranged horizontally next to one another and vertically above one another.
5. Device according to at least one of claims 1 to 4, characterised in that the yarn bundle is impregnated after double division and after impregnation is doubly divided again subsequent to a squeezing mechanism (5, 6).
6. Device according to at least one of claims 1 to 5, characterised in that in the direction of travel (33) of the yarn bundle (9 to 12) after the pre-drier (43) there is arranged a final drier (21) which extends overall to the same height above the ground (44) as the horizontally mounted pairs of heating cylinders (15, 17) of the pre-drier (43) (Figures 1, 3, 4).
7. Device according to at least one of claims 1 to 6, characterised by a roller (19, 20; 67; 84) which is arranged after the pairs of heating cylinders (15 to 18; 57 to 60) and combines the partial yarn bundles (9 to 12; 61 to 64) treated there, the roller being roughly on the associated diagonals (13, 14; 53; 78, 79).
8. Device according to at least one of claims 1 to 7, characterised in that the distance between the outlet of the squeezing mechanism (5, 6; 51) and the line of impingement of the partial yarn bundles (9 to 12; 61 to 64) on the subsequent heating cylinder (15 to 18; 57 to 60) is roughly equal for each partial yarn bundle and, with interposition of normal measuring devices, smoothing rods and after-division rods (7, 8; 56) or the like, is adjusted to a minimum.
9. Device according to claim 7 or 8, characterised in that at least one additional drying cylinder (30, 31, 32) is arranged between the combining roller (19, 20; 67; 84) and the final drier (21).

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