FI98996B - Arrangement for the manufacture of a press shell in a press arrangement intended for the processing of web material, such as paper web - Google Patents

Abstract

Press shell 7 for a press arrangement comprising a mouldable elastomer material for the processing of a material in web form, especially for use in a paper machine, into which press shell successive layers of reinforcements of a hardened shell material have been moulded, and in which press shell there are only two layers with reinforcing filaments 15, 16. The axially running longitudinal filaments 15 form an inner layer on which wrapping filaments 16 have been helically wound. In this way it is possible to manufacture a continuous press wire 7 of exceptional strength. <IMAGE>

Description

• 98996

APPARATUS FOR MANUFACTURING A PRESSING DEVICE FOR A PRESSING EQUIPMENT FOR HANDLING A PULL-BASED MATERIAL, SUCH AS A PAPER WEB -

The present invention relates to an apparatus for producing a press jacket for a pressing device for handling a web-like material, such as a paper web.

A preferred field of application for such a press jacket is in papermaking machines. The pressing device mentioned therein, together with the pressing jacket 15, can be a so-called long-slot press, as disclosed in connection with papermaking machines in the following publications: - US-PS 4,238,287 (fig. 1) - US-PS 4,552,620 (fig. 5) - DE-OS 32 35 468 ( fig. l) - VOITH GmbH publication "Mehrschichtband" (print P4022K / 0197K / Sh / Srö - registered in the Library of the Federal Republic of Germany on 26 July 1984).

* 5 ·· ·: ·· However, the press can release • · 1 ·

• 1 · I

: - DE-OS 35 01 635 (Fig. 6) (= US-PS 4,625,376) • · · · 9 • · 30 # also includes a press roll with a loosely arranged press jacket in a so-called Matt calender.

. The pressing device can also be implemented together with a pressing jacket shrunk on the roll.

· · · 3 · 5 · In connection with the above-mentioned pressing devices, it is known ·: 2: the pressing sheaths mentioned in the preamble. They consist of general. of an elastic layer body in which the so-called

• · · • · · • · · • · • ··· • • • 98996 2 reinforcement fabric. This reinforcing fabric then consists of so-called circumferential yarns extending in the direction of travel of the compression sheath and a material with a high modulus of elasticity and so-called longitudinal yarns extending in the cross-machine direction and giving the compression sheath the necessary shape stability. The longitudinal and circumferential yarns then generally form a textile fabric sheath, which is initially made strip-like and then terminated by joining the ends, and which is finally cast with a wear-resistant elastomeric material 10 and heat-sealed at the same time.

U.S. Pat. No. 4,238,287 discloses a compression sheath of elastomeric material in which wire-like reinforcements are embedded. This compression sheath has a layer of circumferential yarns closed in a sandwich manner by two layers of longitudinal yarn. In order to obtain the required strength for the compression sheath according to U.S. Pat. No. 4,238,287, the reinforcing wire layers must be vulcanized together.

20 The press sheaths known to date have, with the exception explained below, one thing in common: • • »*" They are subjected, starting from a planar, fabric-like "2p reinforcement layer spirally wound: endless or made endless by circumferential yarns • ·: by combining the beginning and end to each other, the following successive steps ·: 1 ·: work steps: • · 1 · · • 1 · 30 Pouring the elastomeric material into an endless reinforcement -....: on one side of the layer and smoothing any top surface formed; • · · ”Translation of the product formed so far; : · 3ΐ * • · • · · • · · · · · · · 98996 3

Pouring the elastomeric material on one side of the reinforcement layer and possibly smoothing the second upper surface and machining any grooves and bores.

5 Apart from the possible formation of a certain weak point at the joint between the beginning and the end of the fabric jacket, the casting of a two-layer elastomeric material in two steps in particular is problematic. There is a risk that the connection between the layers (for example due to inclusions) is incomplete and / or not sufficiently durable. This is especially true when the layers - cf. US-PS 4,238,287 - certainly do not stick together by means of a reinforcement layer, because the reinforcement layer itself is likewise multilayer.

The object of the present invention is to improve the compression sheath in such a way that the etx, {puri.s-sheath can be manufactured more simply and thus more cheaply without any qualitative disadvantages.

This object is solved according to the characterizing part of claim 1.

The extensions of the compression sheath defined in claim 1 are the subject of claims 2 to 7. This gives the advantage, in particular, that a completely homogeneous layer of material is achieved and that the strength of the compression sheath is determined by the tension between the longitudinal and transverse wires, which strength is always adjustable in the same way.

A further advantage is that the wear of the reinforcing wires is eliminated and the service life of the compression sheath (as in VOITH publication P4022K or DE 3235468 or in U.S. Pat. No. 4,552,620) is not excessively shortened.

• · 'S'5: A method is already known from DE-OS 33 18 984. : for producing an endless compression jacket, in which a woven stiffening belt is tensioned on a cylinder and the compression jacket itself is cast into an endless jacket in a helical manner. The stiffening belt is then connected to the inner wall of the clamping jacket and is thus, on the one hand, involved in wear and 5, on the other hand, disposable from the outside, since the wires of the stiffening belt can be individually pulled from the outside. Complete crosslinking or encapsulation of the stiffening belt inside the elastomeric material does not occur here.

The object of the present invention is to provide a device for producing a press jacket, which device - in particular in comparison with the method known from DE-OS 3318984 - can produce a press jacket with substantially rectangular reinforcing wire layers completely cast in the jacket material, i.e. coated with a sufficient amount of sheath material.

The task is solved by the features and combinations of features given in claims 1 to 7, wherein the device is defined in claim 1 in its general form. Claims 6 and 7 relate to device identification marks which are associated with the removal of a finished compression jacket from a casting.

25: m: · · In the following, the invention will be explained in more detail with reference to: the accompanying drawings, in which 9 • »

Figure 1 shows a part of a press for drying paper webs by means of a press sheath guided by a press shoe; Figures 2a and 2b show a part of the structure of a press sheath according to the invention in cross-section and seen from above, both in section; os: * · • ♦ · 4 · • 1 · «· ·« 1 · • · 98996 5

Fig. 3 is a sectional view of a part of the structure of a compression sheath according to the invention, with interconnected, uniformly compressed circumferential yarn parts, as well as grooves and bottom holes; Figures 4a and 4b show a circumferential yarn similar to Figure 3 in detail from two angles, in the longitudinal direction and in section;

Fig. 5 shows a cutting device for making a press jacket, partly seen from the front, partly in cross section;

Fig. 6 schematically shows an apparatus for manufacturing a compression jacket in longitudinal section along the line C-C 15 in Fig. 5;

Figures 7a and 7b show a part of the schematic representation according to Figures 5 and 6, showing in particular the positioned longitudinal wires and the cast peripheral wires, in two viewing angles, from above (Figure 7a) and in longitudinal section (Figure 7b);

Fig. 8 shows a part of the fastening ring for fastening the longitudinal wires • '1 in section along the line D-D in Fig. 7b; * · »<« 25 '• ·: Fig. 9 shows a part of the longitudinal wire guide ring in section along the line E-E in Fig. 7b; *: · ♦: · 1 «1 · Figures 10a and 10b show schematic views showing, as a cross-section, the removal of a finished compression jacket from a casting in two different method steps; · ♦ · • · e t · «*. Figure 11 shows a part of a hollow casting with a shrunk polyethylene sheath and circumferentially divided boreholes.

• · »· · •» i • · · • Il • ·· • · 98996 6

Figure 1 shows - without a machine frame - a part of the press 1 for drying a (through) moving paper web 2. The press 1 consists essentially of an upper roller 3 and a lower roller 4, which in turn have a fixed inner part 5 in which a pressing shoe 6 is pressed hydraulically against the upper roller 3. The fixed inner part 5 of the lower roller 4 and the hydraulically mounted pressing shoe 6 are surrounded by an endless (loop) of elastomeric material molded with reinforcing yarns.

10

The smooth inner surface of the pressing jacket 7 slides on the pressing shoe 6, which together with the upper roll 3 forms an elongated pressing zone 8 (long slit press). The outside of the pressing shoe 6 is formed as a complement 15 corresponding to the diameter of the upper roller 3, i.e. the sliding surface of the pressing shoe 6 has a cavitation corresponding to the diameter of the upper roller 3.

In order to reduce the friction between the pressing shoe 6 and the pressing sheath 7, a device for wetting the inner side of the pressing sheath 7 is provided with a lubricant.

The paper web 2 is passed between two so-called dewatering felts 9, 10 of said pressing zone 8 (arrow a). Due to the friction between the dewatering felt 10 sliding over the pressing shoe 6, the pressing jacket 7 moves over the pressing shoe 6 (arrow b). The upper surface of the clamping jacket 7 can be adapted • · · ·:. to remove water from the dewatering felt 10, specifically water, ....: provided by the paper web 2 in the pressing zone • · ... # to the dewatering felt 10. In that case, grooves and / or bottom holes in the outer upper surface of the pressing jacket 7 • · · * 30. However, the press jacket according to the invention can also be used * 1, for example in the calendar of a papermaking machine. In this case, however, the structure of the outer surface of the compression jacket must be as smooth and uniform as possible.

.33 • · • 1 • · · • · 1 • · • · · · 98996 7

Regardless of the applications in papermaking machines, other uses of such a press jacket are also possible.

5 In the following, the pressing jacket 7 itself and its manufacture will be explained in more detail.

Figures 2a and 2b show the structure of the compression sheath 7 in a cross-section (Fig. 2a) (analogous to the Fiber representation of Fig. 10) and secondly in the plane of the reinforcing wires in the direction of the compressed sheath 7 (Fig. 2b). The first view - Fig. 2a - shows a molded compression jacket 7 with a smooth inner surface and an unworked outer surface. The thickness of the press jacket 7 is selected according to the intended use, whereby, for example, a very thick press jacket 7 can also be produced as a two- or more-layer molded jacket material 17. The press jacket 7 according to Fig. 2a shows a plurality of constant, e.g. 20 are circumferentially spaced longitudinal wires 15. These form the inner layer of reinforcing wires and give the press sheath the required strength over the width of the press zone. The distance from inside the compression jacket 7 is; '·· be large enough for the consumption layer; however, it must also be so small that the necessary flexibility is maintained.

• · · · «« • 1 ·

• · · I

On the side facing the inside of the compression sheath 7, circumferential yarns 16, • · · * 30 representing the second layer of reinforcing yarns are arranged against the longitudinal wires 15. The circumferential yarn layer is formed by twisting the yarn (or also several yarns) helically on the longitudinal yarns 15 and is • · · * prestressed on the longitudinal yarns 15. This prestressing ... ·: must not, of course, be so great that the longitudinal wires .J3 15 come too close to the inner wall of the clamping jacket 7. The reinforcing layers of long and circumferential yarns are then always cast in one uniform layer of sheath material in order to provide a completely homogeneous enclosure. • · · • · · • · · 9 9 9 9 9 9 9 9 98996 8.

The lower view - Fig. 2b - shows a part of Fig. 5 2a cut along the line A-A, this section A-A running along the "above" the circumferential wires 16. The longitudinal wires 15 are oriented parallel to each other at regular intervals; the circumferential yarns 16 are likewise parallel and evenly spaced from each other, however, according to the manufacturing method to be described below, obliquely to the outer edge of the compression sheath 7. The longitudinal wires 15 run (at least almost) parallel to the axis of the sheath (see Figure 7b).

Figure 3 shows another embodiment of the internal structure and design of the compression jacket 7. A longitudinal wire 15 runs parallel to the inner wall of the compression sheath 7; transversely to this, i.e. perpendicular to the plane of the drawing, there are a plurality of circumferential yarns 16 on the longitudinal yarns 15. These circumferential yarns 16 then consist of successive evenly pressed parts, each arranged alternately 90 ° to each other (see Figures 4a and 4b).

Correspondingly to the intended use according to Fig. 1, the following have been machined from the outside of the jacket into the jacket material 17: stiffeners, such as, for example, bottom holes 18 and / or circumferentially • · · ·; . ·. (i.e., parallel to the circumferential wires 16) running grooves · · • M · ....: 19 · • · «· 1 • · · • · · 30 These bottom holes 18 have a diameter of about 2-3mm and a depth of 2-10mm. The surface area on the entire outer surface of the compression sheath 7 should be about 15-30%.

• · · • · · • · ·:: The grooves .4 and 19 machined in addition to or instead of the bottom holes 18 are about 0.4-0.8 mm wide and about • · • l-3 mm deep.

• · • «· • · · • · • · 98996 9

Essential to these bottom holes and grooves is that the reinforcing wires are not damaged, the silicon that the press water will damage the inside of the sheath.

Fig. 4 shows, from two directions, a special circumferential yarn 16 according to Fig. 3, namely in the longitudinal direction (Fig. 4a) and in section B-B (Fig. 4b). This circumferential yarn 16 consists of alternating, evenly compressed yarn portions 20 arranged opposite each other so as to form portions directed at each other and perpendicular to each other. The special formation of the circumferential yarns 16 in the molded compression sheath 7 provides a substantially better net locking between the circumferential yarns 16 and the sheath material. In this way, the yarns are optimally fastened and the clamping sheath 7 obtains optimal shape and dimensional stability.

In general, the more deformed the circumferential yarns 16 are made in their longitudinal direction. The cross-sectional changes in general, the evenly spaced squeezes and the remaining circular cross-sections between these squeezes and the alternating, cross-squeezes according to the example of Figure 4 allow for good shape locking between the reinforcing yarns and the sheath material. If necessary, the circumferential yarns, the longitudinal yarns or also both reinforcing yarns together may have the above:. such cross-sectional changes.

• · · · * · • · · • i

The reinforcing yarns themselves are so-called monofilaments, i.e. non-twisted yarns, or they always consist of 2-6 mono- • · · "* 3Ö single brick yarns twisted together.

In a particular embodiment, some reinforcing wires may be monofilaments and others stranded. Monofilament • * *: the threads avoid air locks and center abrasions .... However, even in the reinforcing yarns twisted from 2 to 6 monofilament yarns, the intermediate spaces are so large that the sheath material can penetrate well and sufficiently.

Due to their strength and machining properties, the reinforcing yarns consist of dust core or polyester, and in particular such that the longitudinal yarns - for elasticity - are made of polyamide and the peripheral yarns - for dimensional stability - are made of polyester. Elastomeric carpet material. ' Due to the good wear resistance, polyurethane is preferably selected.

The manufacture of a press jacket 7 as described above will be explained below in connection with a device for its manufacture.

15

Figure 5 shows a schematic view of the entire device. The device consists of two functionally synchronized basic units, a support 26 movable on a fixed table and a casting 28 rotatably mounted on fixed bearing plates 27. This is formed in the example shown as a hollow cylinder rotated about · '· .. the translational actuator for the support 26 is synchronized with each other. The specific angle of rotation of the casting 28 corresponds to: .1. 26 specific ‘purchase movements’ of the bracket.

* · • · · m · 1

The support 26, which can be moved, for example by means of a spindle drive 29, perpendicular to the plane of the drawing in the guide rails, supports the ones shown in Fig. 5! firstly, a unit 31 for producing and feeding the elastomeric castable sheath material and secondly, a device 32 for feeding the circumferential yarn 16 (s).

• · · ·> • · ... 35 A unit 31 for the production of a jacket material, the supply unit consists of two storage tanks 33 for the components of the jacket material, • • • · · • · · · · 98996 11, of these a component mixer 34, a supply line 35, and a casting nozzle 36 for feeding the jacket material to the top surface of the casting 28. Said elements defining the unit 31 are mechanically rigidly connected to the support 26 and are thus moved translationally with it. The casting nozzle 36 is then preferably positioned so that it is above the casting 28 and at a slightly different point in the lateral direction.

The device 32 for feeding at least one circumferential yarn consists of one (or more) spools of yarn 37 from which the peripheral yarn can be drawn. The wire spool 37 is also fixedly connected to the support 26. A guide device 38 15 for the circumferential yarn or yarns 16 is arranged in the path of the circumferential yarn 16 between the wire roll 37 and the casting piece 28. In the control device 38, adjacent circumferential wires 16 are arranged axially at the correct distance from each other.

The apparatus described so far will be explained in the following 20 in connection with its mode of operation together with the manufacture of the compression jacket 7.

Prior to the start-up of the apparatus shown in Fig. 5, the casting piece 28 is prefabricated so that longitudinal wires 15 are fastened to the entire circumference at equal intervals and at the same distance from the upper surface of the casting piece 28: These longitudinal wires 15 • · · ·:. are parallel to each other and form a siren over the circumference of the casting 28.

• · 1 · · • · ♦ * 3 (5 The beginning of the circumferential wire 16 is thus attached to the end side of the casting 28.

• »• · · · The casting 28 is then rotated (arrow W).

....: At the same time, the casting nozzle 36 opens and the support 26 moves ..35 linearly. The elastomeric sheath material 17 runs on the upper surface of the casting 28 to which the longitudinal wires 15 are attached, and forms a coaxial compression sheath layer on the casting 28. As the casting 28 rotates, the circumferential yarn is wound simultaneously with a certain bias. The bias is dimensioned so that the circumferential wire 5 is tensioned over the longitudinal wires 15 and these press lightly against the upper surface of the casting 28.

In connection with the rotation of the casting piece 28 and the casting of the jacket material 17, as already mentioned, the support 26 moves linearly. Thus, the compression sheath is formed from a helically (= helically) wound strip of liquid material 17. At the same time, the circumferential yarn 16 is wound helically (helically) onto a cage system of longitudinal wires 15. In this case, the circumferential wire 16 is still guided to the run-15 but to the material 17 and, when the sheath material 17 hardens, adheres to it.

In the embodiment according to Figure 5, half of the first thread of the material 17 is cast. This start of the compression sheath 20 7 closes as the casting process and the winding process of the circumferential yarn 16 continue and continues over the length of the casting 28 to one end thereof.

* '· .. Fig. 6 is a schematic top view of the apparatus shown in Fig. 5 •: 2 «$ and along the line C-C in Fig. 5: sectioned.

• · 1 • · · · ψ m • ♦ · • ·

Longitudinal wires 15 and, in the simplest case shown in particular, the fastening rings 15 supported on the end faces of the casting 28 are attached to the rotating (arrow W) bearing bearing plate 27 on the rotating (arrow W) bearing the guide plate 30 parallel to the axis of the casting 28: the rail 30 moves (arrow S). Bracket · ...: 26 supports two spools of wire 37 for unwinding two circumferential yarns 16 ..Λ5, and a casting nozzle 36.

W · • • · · • · · • · 98996 13

During the simultaneous rotational (axial) movement of the casting 28 and the translator (axial) movement of the support 26, a layer of elastomeric sheath material 17 is cast in a helical fashion; the circumferential yarns 16 are simultaneously wound on this layer 5, which are thus likewise drawn in a helical manner over the longitudinal yarns 15.

In the drawing according to Figure 6, about one third of the compression jacket 7 is pre-cast.

10

Figure 6 further shows another embodiment of the invention. A thicker compression jacket is required for certain applications; however, such material thicknesses cannot generally be realized with a single 15 casting nozzle 36.

Figure 6 shows a solution to this problem by means of a second casting nozzle 36 ', which is likewise rigidly attached to the support 26 and thus moves synchronously, albeit steplessly with respect to the first casting nozzle 36, along the casting piece 28. With this second casting nozzle 36 ', a second layer of jacket material 17' can thus be cast. In this case, it is essential that the reinforcement of the compression sheath 7, which consists of longitudinal wires 15 and circumferential yarns, is completely immersed in the first layer of sheath material 17, which '· *. ^ allows a perfect connection between the sheath material and the I »· reinforcing wires.

• »· ··· · ·· *« · | * Figure 7 shows a part of the upper surface of the casting 28 from two directions (Figures 7a and 7b).

"**! Fig. 7a shows an arrangement of longitudinal wires 15,: T: which longitudinal wires are tortuously arranged between two fasteners 40a / 40b along the sheath • · 35 of the casting. Each fastening ring 40a / 40b consists of a cuff

l «* M

. from a circumferential ring 41 having circumferentially arranged cams 42. These cams define the distance of the longitudinal wires 15 below and their distance from the upper surface of the casting 28. In the drawing, the lower end mounting ring 40a has a flange portion 43 on which the mounting ring 5a 40a is located on the end side of the casting 28. The upper, second retaining ring 40b is detached in the casting 28 and is connected to a radially outwardly directed surrounding portion 44, which in turn can be bonded by a screw connection 45 and a flange 46 resting on the other end side of the casting 28.

In order to mount the longitudinal wire 15 and to mount both fastening rings 40a / 40b on the cams, said screw connection 45 is loose. If the longitudinal wire 15 is placed over the entire upper surface of the casting piece 15 in the cams 42 and these wire strands form a closed cage between the fixing rings 40a / 40b, the fixing ring 40 detached in the casting is pulled towards the end side by means of a screw connection 45. This tightens the longitudinal wires 15.

20

With respect to the circumferential wires tensioned on the longitudinal wires 15, which run helically, i.e. obliquely in Fig. 7, it is conceivable to rotate the fastening rings 40a / 40b so long that the longitudinal wires 15 .25 also oblique and form a rectangular lattice pattern with the circumferential wires 16.

• · • · · ··· / From the side view of Fig. 7a, i.e. Fig. 7b, it should be noted that: the casting nozzle 36 has already advanced more than half the width of the compression jacket 7 to be made along the upper surface of the casting 28. Until then, the circumferential yarn 16 has been spirally drawn into the sheath material 17 for the longitudinal yarns 15.

• ·

In order to ensure with certainty that the longitudinal wires 15 * 3.5 do not press against the casting 28 when the sheath material 17 is cast or installed], i.e. to maintain the distance of the longitudinal wire 15 from the casting 28, a longitudinal wire guide ring unit 47 is provided. which moves synchronously with the casting nozzle 36 above (arrow S).

5

The longitudinal wire guide ring unit 47 consists of a distance holding ring 48 located between the upper surface of the casting 28 and the longitudinal wires 15, and a comb-shaped ring 49 with grooves corresponding to the mutual distance 10 of the longitudinal wires 15. This guide ring unit 47 consisting of a spacer ring 48 and a comb-shaped ring 49 is connected to a support 26 by a guide device (not shown).

With this longitudinal wire guide ring unit 47, 15 longitudinal wires are directed over the entire circumference of the casting 28. The casting flow of the jacket material 17 from the casting nozzle 36 thus secures these longitudinal wires 15 in their right places and in the right direction, whereby for clarity it should be noted that the longitudinal wire guide ring unit 47 performs a linear movement compared to the casting 28 and rotates with the casting 28.

Fig. 8 shows a part of the (lower) fixing ring 40a according to the section line D-D in Fig. 7b. From this figure. '. 25 a cuff-shaped ring 41 is observed, which is a m-piece. 28 sheath and arranged in a series around the circumference. . cams 42 with grooves therebetween. Through these grooves • • · j ·: / are drawn longitudinal wires 15 wound around every other • · ·; ··: cam 42.

Fig. 9 shows a part of the longitudinal wire guide ring unit 47 according to the section line EE of Fig. 7b. This consists of a spacer ring 48 on the upper surface of the casting 28 and supporting or keeping the longitudinal threads 15 at a distance * 315 from the casting. . Before the spacer ring 48 is | arranged a comb-shaped ring 49 with longitudinally spaced grooves 50 for the longitudinal yarns 15, by means of which the combed ring 49 is mounted over the longitudinal yarns 15 on the casting 28 .

The comb-like ring 49 is formed in several parts, whereby its parts can be fastened to each other by means of screw connections 51. In this case, it is possible that the ring 49 can be mounted after the longitudinal wires 15 have been fastened.

With respect to the shape of the longitudinal wire guide ring unit 47, it is also conceivable to provide the spacer ring 48 with a circumferential step and grooves corresponding to the longitudinal wires 15, and to install the spacer ring simultaneously with the pulling of the longitudinal wires 15.

15

In connection with the method steps shown in Figures 10a and 10b, the removal of the pre-cast press jacket 7 must also be explained.

A clamping ring is provided on both end areas of the clamping jacket 7. One clamping ring 53 is fixedly connected to the clamping jacket 7 and dimensioned relative to the casting so that it can be pulled together with the clamping jacket 7 in its longitudinal direction, but sealed, ♦ .25 however, well the gap between the clamping jacket 7 and the casting 28. The second clamping ring 54 is implemented so that it. . remains immobile relative to the casting and • · · ** enables the press jacket 7 to slip or be drawn through. Also, the second clamping ring 54 must press the clamping sheath 7 '3Ό as tightly as possible against the casting 28. (Figure • ♦ ·: 10a).

*: * ·: When liquid is now pressed through the casting line 28 or the supply line 55 passing through the wall thereof into the area of the separating seam between the pressing jacket 7 * 35 and the casting piece 28, | this fluid in the separation seam is air-cushion-like and the compression • · • • · • · * · · m · 17 58996 jacket can be pulled out by means of a pull ring 56. The first clamping ring 53, together with the clamping jacket 7, runs along the casting 28 until it comes against the second clamping ring 54 and the clamping jacket 7 is completely free. This pulling 5 is facilitated by coating the casting 28 with a grip-reducing material before the casing material is poured. (Figure 10b).

According to Figure 11, other possibilities can be considered for removing the compression jacket 7 molded into the casting 28.

The casting 28 is a hollow cylinder. Prior to casting the jacket material 17, a polyethylene jacket 57 is shrunk in this hollow cylinder. If liquid is now pressed through the holes 58 in the wall of the hollow cylinder, a sliding layer is formed in the separating joint between the casting 28 and the polyethylene jacket 57 and the press jacket 7 can be removed together.

20

In principle, it is also conceivable to coat the casting 28 with a material which prevents the cladding material from holding and to expand and remove the compression jacket from the outside or through holes in the hollow-cylindrical casting by heat treatment from the inside.

ψ

The method and apparatus described above for carrying out this method can be used to make a press jacket, which is relatively inexpensive to manufacture because of the work steps; m *: * 3O weaving, finishing and heat setting of the fabric are not necessary, and since, in principle, a stable compression sheath can be achieved by a single casting process.

·: ♦ ·· Especially by turning the finished press jacket. *: ·. is not necessary, it is possible - possibly also by multi-layer casting - to produce relatively thick diaper | and. Of particular importance in this context is that the reinforcement, • · * · • · · · · * · • * »· • · · ·

- I ..

98996 18, i.e. the reinforcement, is certainly inside the compression jacket and is thus protected against wear and interference.

In this connection, it should also be noted that the upper surface, i.e. the outer surface, of the compression jacket 5 still has to be machined after casting. Firstly, especially when used in a Matt calender, the upper surface must be ground cylindrically smooth, and secondly - cf. Fig. 3 - bottom holes and grooves must be machined to receive water when used in a drying press. As for the inside of the press jacket, it can be left unmachined.

9 9 9 • · 9 9 m · • · • · 9 · 9 999 m 9 9 9 9 9 9 9 9 9 99 9 9 9 9 999 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 m 9 • * • · • · · • · • 9 9 9 9 9 9 9 9 9 9 • · .............. ...... n .............. _________- R · '

Claims (7)

98996 Apparatus for manufacturing a press jacket for a press-like material for handling web-like material, in particular a long-slot press machine, characterized in that an axially symmetrical casting (28) with longitudinal wires (15) at each end is provided, corresponding to the mold of the press jacket (7). correspondingly, a fastening ring (40) for providing at least one casting nozzle (36) movable parallel to the axis of the casting (28) for the sheath material (17), for providing at least one feed device (32) circumferentially movable parallel to the axis of the casting (28) (16), and that the actuating members of the casting 15 (28) and the support (26) supporting the casting nozzle (36) are arranged relative to each other so that as the casting (28) rotates, the support (26) moves so that the jacket material spreads in a helical and continuous manner. (16) water than the age of 20 at the same time as the shell material helically. Device according to Claim 1, characterized in that a longitudinal wire guide ring (47) is provided, which thus secures the distance between the longitudinal wires (15). 25 as well as their distance from the casting (28), and is »· • movable in front of the cast casing material layer. Device according to Claim 2, characterized in that: the casting nozzle (36), the peripheral wire feed device (32) and •: "3b the control device of the longitudinal wire guide ring (47) are fastened together in the axial direction of the casting (28) for the movable support (26). «· Device according to Claim 2 or 3, characterized in that the longitudinal wire guide ring (47) is formed as a multi-part so that the outer part can be build after attaching the longitudinal wires (15). Device according to Claim 1, characterized in that the longitudinal wires (15) are tensioned back and forth between the fastening rings by means of respective fastening cams (42) in the fastening rings (40). Device according to one of Claims 1 to 5, characterized in that at least one liquid supply line (55) is arranged at one end of the casting (28) towards the separation seam of the casting (28) and the pre-cast pressing jacket (7), and that at this end of the casting (28) a second clamping ring (54) immovable with respect to this 15 and at the other end a first clamping ring (53) immobile with respect to the clamping sheath (7) are arranged. Device according to one of Claims 1 to 6, characterized in that the casting (28) is a hollow cylinder, that a polyethylene sheath (57) is shrunk on the hollow cylinder, that the hollow cylinder has a plurality of small bores (58) arranged around the circumference, and that the hollow cylinder the interior can be pressurized through its end side with a pressurized 2. fluid. • · • · • · · · · * · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • · · • · 1 »• · · • · · φ 21 98996