WO2002086232A1

WO2002086232A1 - Woven belt for a paper machine

Info

Publication number: WO2002086232A1
Application number: PCT/EP2001/004612
Authority: WO
Inventors: Armin Birzele
Original assignee: Mühlen Sohn GmbH & Co.
Priority date: 2001-04-24
Filing date: 2001-04-24
Publication date: 2002-10-31

Abstract

The invention relates to a material belt for a corrugated cardboard machine, whereby the belt ends (2, 3) are reduced in thickness and, in order to connect the thickness-reduced belt ends (2, 3), a number of clips (7) are pressed into each belt end at a separation (a) from each other. The clips (7) of the one belt end are displaced relative to the clips (7) of the other belt end, such that a moving joint is formed at the connection with a connecting strip (25) running through the interlocking clips (7) of both belt ends (2, 3). The clips (7) are approximately U-shaped with bent end sections (18, 19) on the free arm ends thereof, which are pressed into the material of the belt (1). According to the invention, a high quality connection is achieved, whereby the bent end section (18) extends through the thickness-reduced belt ends (2, 3) and the tips (9, 9') thereof protruding from the belt ends (2, 3) are formed into a barb shape.

Description

Woven belt for a paper machine

The invention relates to a woven belt for a paper machine, in particular for a corrugated cardboard machine according to the preamble of claim 1.

From DE 195 40 229 Cl the connection of the belt ends of a belt is known in order to obtain an endless belt. For this purpose, the belt ends are reduced in thickness and a plurality of clamps which are spaced apart are pressed in to connect the reduced-thickness belt ends. The brackets on one end are offset from the brackets on the other end. If the ends are pushed into each other, the interlocking clamps of both ends can form a movable joint with a jointly projecting connecting rod, which ensures trouble-free circulation of the belt on deflection rollers, drive rollers or the like. The clips have an approximately U-shape with end sections angled at the free leg ends, which are pressed into the fabric of the belt.

Connections made in this way have proven themselves in practice.

The invention has for its object to further optimize such connections in order to create a secure, heavy-duty connection that is functional over an entire belt life.

The object is achieved according to the characterizing features of claim 1. The angled end sections at the leg ends of the clips are chosen so long that they penetrate through the reduced-thickness belt end during the clamping and emerge from the belt end. This tip of the end section emerging from the belt end is deformed at the same time as it is clamped and bent back into the belt end. This results in a barb-like clawing of the tip in the belt end, so that the clip is held in the material of the belt with high strength.

In order to achieve a high-strength connection, the belt end has a thickness reduction of approximately 1 mm to 2 mm, preferably from approximately 8.5 mm to 10.5 mm, for a belt thickness of 7 mm to 11 mm, preferably of approximately 8.5 mm to 10.5 mm 1.25 mm to 1.75 mm. The length of a belt end measured in the longitudinal direction of the belt is approximately 16 mm to 26 mm, in particular approximately 24 mm, the leg lengths of the clip being approximately in the same length range. The end sections engage in the belt fabric in the area of the step resulting from the reduction in thickness.

The legs of a clip are about 1.5 mm to 4.5 mm apart, in particular about 4 mm apart, in the pressed-in state, the wire of the clip being preferably cylindrical and having a diameter of about 0.9 to 1.5 mm, preferably about 1.2 mm. The dimension of the protrusion of the tip of the end section when pressed into the belt end is approximately 1 mm, preferably approximately 0.6 mm to 0.9 mm. With this size, there is a good design of the barb-shaped end.

In order to achieve a long service life of the belt, the fabric threads have a share of more than 30% aromatic aramid, preferably more than 90% para-aramid, the rest consisting of polyester fibers or other carrier fibers. To increase good heat dissipation, up to 7%, preferably about 4%, metal fibers are added to the thread material.

In order to limit wear, the belt side facing away from the paper side is formed essentially over the entire surface of aramide, and a portion of the fibers can consist of Teflon or Nomex (metaaramid).

Further features of the invention result from the further claims, the description and the drawing, in which a single embodiment of the invention is shown below. Show it:

1 is a schematic representation of a section through the connection of the reduced-thickness belt ends of a fabric belt,

2 shows a schematic view of a clip provided for connecting the reduced-thickness belt ends,

3 is a plan view of a reduced-thickness belt end provided with clamps,

4 shows the thread course of a woven belt in longitudinal section,

5 is a partial plan view of the upper fabric layer forming the paper side,

Fig. 6 is a plan view of the outside of the lower fabric layer. The belt 1 shown in Fig. 1 consists of one or more layers of fabric, as shown in the sectional view of FIG. 4. To produce an endless belt as used in paper production, in particular corrugated cardboard production, the belt ends 2, 3 are connected to one another.

In a preferred embodiment, the fabric structure - as shown in FIG. 4 - is composed of an upper fabric layer 10, a middle fabric layer 20 absorbing the tensile forces and a lower fabric layer 30. The side of the upper fabric layer 10 facing away from the middle fabric layer 20 absorbing the tensile forces forms the paper side of the fabric belt 1.

In the fabric layers 10, 20, 30, the weft threads 4 run transversely to the longitudinal direction 5 (FIG. 5) of the belt 1.

In the upper fabric layer 10 there are four warp threads 11, 12, 13 and 14 which are offset with respect to one another and run both inwards to the middle fabric layer 20 and outwards to the paper side via at least two weft threads 4 each. The middle fabric layer 20, which absorbs the tensile forces, has two warp threads 21 and 22 that run offset from one another and each run over two weft threads 4. The lower fabric layer 30 consists of four warp threads 31, 32, 33, 34, each offset with respect to one another, which run inwards - towards the middle fabric layer - via only one weft thread 4 and outwards via at least three weft threads 4.

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of the leg 16 in the plane of the bracket 7 in the installed position according to FIG. 1 protrudes beyond the leg 15. In the installed position, the end section 19 can end in front of the leg 16 within the clamp 7; Expediently, the end section 19 also projects with its free end g ¹ beyond the contour of the clamp 7, as indicated in FIG. 1. The projection v of the free end of the end section 18 is approximately 1 mm, preferably approximately 0.6 mm to 0.9 mm. The free wire ends 50 of the end sections 18, 19 are advantageously cut to a point in order to promote penetration into and puncturing through the belt end 3. The sharp cutting of the wire ends 50 is also advantageous to support the barb-like deformation and bending of the tip 9.

Each end section 18, 19 forms with its leg 15, 16 carrying it an angle 23, 24, the angles 23, 24 being less than 90 °. The angle 23 between the longer leg 16 and the end section 18 is preferably approximately 56 °, in particular approximately 48 ″, and the angle 24 between the shorter leg 15 and the end section 19 is approximately 68 °, in particular 54 °. The distance B between the legs 15 and 16 is smaller in the installed position than the thickness of the reduced-thickness belt ends 2 and 3, so that the legs 15 and 16 are pressed into the material of the belt ends 2 and 3. The distance B is preferably between 1.5 mm and 4.5 mm 2 in the starting position, the angle 49 between the legs 15, 16 of the undeformed bracket 7 is approximately 80 °, the longer leg 16 measures approximately 23.4 mm, the shorter leg 15 approximately 19.4 The end section 18 has a length of approximately 8.7 mm and the end section 19 has a length of approximately 8.2 mm.

As can be seen from FIGS. 1 and 3, at least the angled end section 18 penetrates the belt during stapling. φ rt

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Claims

Expectations

1. Fabric belt for a paper machine, in particular for a corrugated cardboard machine, the belt ends (2, 3) being reduced in thickness and for connecting the reduced-thickness belt ends (2, 3) at each belt end, in each case a plurality of brackets lying next to one another at a distance (a) (7) are pressed in and the clips (7) of one strap end are offset from the clips (7) of the other strap end, and with one of the interlocking clips (7) of both strap ends (2, 3) jointly projecting connecting rod (25), the forms a movable joint of the connection with the brackets (7), the brackets (7) having approximately U-shape with end sections (18, 19) angled at the free leg ends, which are pressed into the fabric of the belt (1), thereby characterized in that the angled end section (18) penetrates the reduced-thickness belt end (2, 3) and its tip (9, 9 ') emerging from the belt end (2, 3) is deformed like a barb.

2. Belt according to claim 1, characterized in that the belt (1) has a thickness (D) of about 7 mm to 11 mm, preferably about 8.5 mm to 10.5 mm.

3. Belt according to claim 1 or 2, characterized in that the thickness of the belt (1) is made from its two flat sides and on both sides a dimension (d) of about 1 mm to 2 mm, preferably about 1.25 mm up to 1.75 mm.

4. Belt according to one of claims 1 to 3, characterized in that the length (1) of the belt end (2, 3) measured in the longitudinal direction (5) is approximately 16 mm to 26 mm, in particular approximately 24 mm.

5. Belt according to one of claims 1 to 4, characterized in that the distance (B) of the legs (15, 16) of a clip (7) in the pressed state is about 1.5 mm to 4.5 mm, in particular about 4 mm.

6. Belt according to one of claims 1 to 4, characterized in that the clip (7) made of a wire, in particular cylindrical wire with a diameter in the range of about 0.9 mm to 1.5 mm, preferably about 1.2 mm , is formed.

7. Belt according to one of claims 1 to 6, characterized in that the distance (a) adjacent brackets (7) is about 1.8 mm to 4 mm, preferably about 3.67 mm.

8. Belt according to one of claims 1 to 7, characterized in that the tip (9) with a protrusion of (v) of about 1 mm, preferably about 0.6 mm to 0.9 mm from the reduced-thickness belt end (2, 3) comes out.

9. Belt according to one of claims 1 to 8, characterized in that the connecting rod (25) has a cylindrical cross section and has a diameter of about 2 mm to 4 mm.

10. Belt according to one of claims 1 to 9, characterized in that the fabric threads of the belt have fibers in a proportion of more than 30% flavored polyamide, preferably more than 90% para-aramid (Kevlar) and the rest of polyester fibers and / or other carrier fibers.

11. Belt according to claim 10, characterized in that the thread material up to about 7%, preferably about 4%, metal fibers are mixed.

12. Belt according to one of claims 1 to 11, characterized in that at least the side of the belt facing away from the paper side consists essentially of the entire surface of aramid.

13. Belt according to one of claims 1 to 12, characterized in that the belt side facing away from the paper side contains highly heat-resistant, easy-sliding fibers made of Teflon (polytetrafluoroethylene) or Nomex (metaaramid).