EP0879199B1 - Roller for a winding machine - Google Patents

Abstract

PCT No. PCT/EP97/00146 Sec. 371 Date Jul. 2, 1998 Sec. 102(e) Date Jul. 2, 1998 PCT Filed Jan. 15, 1997 PCT Pub. No. WO97/28075 PCT Pub. Date Aug. 7, 1997Webs of paper or cardboard are rolled up using carrying or supporting rollers or pressing rollers with a hollow cylindrical body of a rigid material to which a deformable layer is applied. The deformable layer consists of a cellular plastic material partly with open pores and partly with pores which are closed on themselves and in which the pore size can be less than 5 mm. The compression modulus of the material is less than 10 MPa.

Description

Technical field

The invention relates to a support, support or pressure roller for a winding machine, in particular for winding paper or cardboard webs provided therefor is to lie under pressure on winding rollers when winding up, and one Winding machine with a roller according to the invention.

State of the art

For the production of winding rolls from paper or divided by longitudinal cuts Cardboard webs are known to be used winding machines that one or have two driven rollers, on which the winding rollers engage during winding or lie on. The rollers are referred to as support rollers if they are completely that Bear the weight of the overlying reels (DE-A 39 24 612). Will the weight in whole or in part of the retracted arms in the sleeves of the winding rolls held guide heads, the rollers are referred to as backup rollers (DE-C 31 02 894, DE-C 40 12 979).

Furthermore, winding machines contain a so-called pressure roller, the opposite to the line of contact between a winding roll and a support or support roller is pressed against the winding rollers at the start of winding, when the from the Roll weight resulting contact pressure for the desired winding hardness is not yet sufficient, and which contributes significantly to the stability of the winding (DE-C 37 19 093, EP-C 0410093).

The winding hardness decisive for the quality of the winding rolls (= surface pressure between the layers of a winding roll) depends on the line load and the geometric Conditions in the nip between a winding roll and the support or support roller dependent. The line pressure is the contact pressure standardized to the width of the winding roll, measured in N / m. When manufacturing winding rolls, efforts are made a predetermined, uniform winding hardness at high production speeds adjust without surface damage or winding errors in the Occur winding roll. Winding reel errors are caused by overstretching the web in the nip caused. Because the stretch in the nip between a support roller and a winding roller as the roll diameter increases, their value limits the maximum Final diameter of a perfectly wound winding roll.

In order to produce winding rolls with a larger diameter and good winding quality, EP-A-0562266 proposes a carrier roll winding machine, the outlet side, not wrapped by the web and opposite the inlet side Carrier roller lowered carrier roller has a jacket that is much stronger is deformable as the jacket of the inlet-side support roller. According to one embodiment the carrier roller has an outer layer of rubber in the chambers are arranged, which are connected to the inside of the support body made of steel are. Due to the strong deformability, the contact pressure on the support rollers as limited as possible so that the winding hardness is not disproportionately high increases.

U.S. Patent 3,503,567 describes a winding machine for winding Paper coated with pressure sensitive capsules. To crush the pressure sensitive capsules in the nip between the winding roller and the backup roller avoid, the backup roller consists of a hollow cylindrical support body Metal, on the jacket of which a deformable layer of a foamed synthetic material is applied. The deformable layer of the backup roller absorbs so much of the pressure between the winding roll and the Back-up roller to prevent the capsules from breaking.

Presentation of the invention

The invention has for its object to a roller for a winding machine create a winding without winding errors when used as a support or back-up roller enables with lower winding hardness. When used as a pressure roller, it should Fluctuations in the uniformity of the winding rolls, the z. B. from profile fluctuations result, balance, so as to the uniformity of the To ensure contact pressure.

This object is achieved with the features of patent claim 1.

Brief description of the drawing

The drawing serves to explain the invention with reference to a simplified representation Embodiments.

Figur 1

einen Längsschnitt durch eine erfindungsgemäße Trag- oder Stützwalze,

Figur 2

einen Querschnitt durch die Walze aus Figur 1,

die Figurer 3 bis 5

verschiedene Gestaltungen der äußeren Mantelschicht der Walze,

Figur 6

eine Walze, bei der die kompressible Schicht aus einzeln aufgezogenen Ringen besteht, und

die Figurer 7 und 8

die Wirkungsweise einer erfindungsgemäßen Tragwalze im Vergleich zu einer Tragwalze nach dem Stand der Technik in einer Tragwalzen-Wickelmaschine.

Show it:

Figure 1

a longitudinal section through a support or support roller according to the invention,

Figure 2

2 shows a cross section through the roller from FIG. 1,

Figures 3 to 5

different designs of the outer jacket layer of the roller,

Figure 6

a roller in which the compressible layer consists of individually wound rings, and

Figures 7 and 8

the mode of operation of a support roller according to the invention in comparison with a support roller according to the prior art in a support roller winding machine.

Ways of Carrying Out the Invention

In Figure 8 is the principle of a support roller winding machine for winding through Longitudinal sections of subdivided paper or cardboard web 1 shown for winding rolls 2, at the roller shown in Figures 1 to 6 as a support roller or as a pressure roller can be used. A carrier roll winding machine contains two driven ones Carrier rollers 3, 4, on which the winding rolls 2 coaxial and aligned when winding lie in a row and thus bear the entire weight of the winding roll. The paper or cardboard web 1 is preferred from below, the inlet-side support roller 4 partially looped through the gap between the support rollers 3, 4 and runs in the nip between the inlet-side support roller 4 and the winding rollers 2 on this.

One or both support rollers 3, 4 of the support roller winding machine are designed as a roller designed the invention. The roller according to the invention is preferred as the outlet side Carrier roller 3 used, so compared to the inlet-side support roller 4 is arranged that their contact line to the winding roll (nip 5) at the same height or lower than the line of contact between the other winding roll 4 and the winding roll. The Carrier roller 3 thus carries the same or greater proportion of the weight of the winding rolls 2. In addition, the inlet-side support roller 4 can also be used as the roller according to the invention be designed.

On top of the winding rolls 2 there is an over the working width of the winding machine, i.e. the axial length of the support rollers 3, 4, extending pressure roller 6 to Beginning the winding presses the winding rollers 2 against the support rollers 3, 4 if that Winding roll weight is not yet sufficient for the desired winding hardness.

In Figures 1 to 6, the structure of a roller according to the invention when used as Carrier or backup roller 3 shown in more detail. As a support roller 3 it has an axial length corresponding to the maximum width of the paper or Corresponds to cardboard web 1, which can be up to 10 m; their diameter is between 500 mm and 1500 mm. The support or support roller 3 according to the invention a hollow cylindrical support body 7 made of a solid material, in particular made of steel, which is designed to be sufficiently stable to prevent bending to be able to support 2 forces acting on or against the winding rollers. On both end faces of the support body 7 shaft journals 8 are attached, with which the Roller 3 is stored in the frame of the winding machine. A shaft journal 8 each support or support roller 3 is connected to a rotary drive with which the roller 3 around its Longitudinal axis is rotated around the overlying or adjacent winding rollers 2 for winding to turn.

On the outer lateral surface of the support body 7 there is a layer 9 made of a cellular a large number of pores filled with a gas, in particular air, and therefore applied compressible plastic material that a compression module K of has less than 10 MPa. It is important that a large number of relatively small pores is evenly distributed over the volume of the layer 9. The pore size is preferred smaller than 5 mm, a pore size between 0.05 mm has proven to be particularly advantageous and 1 mm shown. The pores in layer 9 are partially open - that is connected - partly closed. The percentage of open pores is 30% to 70%, preferably about 50%. The ratio of the open pores to the closed pores determines both the compressibility and the ability of the Layer to dissipate heat generated inside to prevent unwanted overheating avoid.

A layered cellular elastomer, in particular polyurethane, is preferably used for the layer 9, which has a compression modulus κ of 1 MPa to 5 MPa. The radially measured thickness of layer 9 is at least 10 mm, preferably between 10 mm and 40 mm, in the example approximately 25 mm. The density of the material of the layer 9 with the pores is less than 800 kg / m ³ , preferably between 350 and 650 kg / m ³ . According to a preferred embodiment, the layer 9 has a hardness between 15 and 60 measured according to Shore-A. The roller is thus relatively soft on its outer surface in order to form a relatively wide nip when a winding roll is in contact.

In Figures 3 to 5 different possibilities are shown, the compressible To arrange layer 9 on the support body 7:

In the embodiment of Figure 3 is located on the outer surface of the Support body 7 exclusively a layer 9 of compressible material, preferably a cellular elastomer. The thickness of the layer 9 is 10 mm to 40 mm.

In the outer surface of the layer 9 are a plurality of circumferential, in Figure 3 Not shown grooves are incorporated at a distance from each other, if wrapping Avoided of air in a winding roll 2 or excessive noise during winding should be reduced.

In the embodiment according to FIG. 4 there is between the compressible layer 9 and the support body 7 a hard base layer 10 made of an incompressible Material, preferably rubber, which is non-slip connected to the support body 7. The non-slip binding can e.g. B. can be achieved by vulcanization. To one To form wear-resistant outer running layer 11 is on the outside of the compressible Layer 9 attached another elastic layer, which is grooved if necessary.

Figure 5 shows an embodiment with circumferential grooves 12 in a wear-resistant outer layer 11. The compressible layer 9 is directly on the without intermediate layer Support body 7 attached.

In the embodiments according to FIGS. 4 and 5 with an additional elastic, However, incompressible overlay 11, it is important that its structure and properties are selected such that they are deformable as a pure protective layer, in particular the compressibility of the lateral surface of the support or support roller 3 below the load of a winding roll 2 is not significantly affected. To influence her To reduce deformability, the outer running layer 11 by transverse to the grooves 12 incisions are weakened.

Figure 6 shows the preferred embodiment of a support or Back-up roller in which the compressible layer 9 consists of individual rings 13. The Rings 13 with a width in the axial direction of the roller of 50 mm to 500 mm either in immediate succession or at such a short distance from each other arranged that the gap between two rings 13 no marks on the Causes winding rolls 2. If there is a space between the rings 13, this is preferably 5 mm to 30 mm. Rings 13 are preferably used one larger by the desired thickness of the layer 9 and a little smaller Have inner diameter than the outer diameter of the support body 7. The Rings 13 are successively with the inner diameter expanded by expansion to the Support body 7 pushed so that they are then under tension on the support body 7 sit. The tension ensures a non-slip Seat of the rings 13 on the support body 7. A sufficiently firm fit can can also be achieved, for example, in that the rings 13 or can be attached to the supporting body 7 by gluing or jamming. The rings 13 are arranged in parallel on the support body 7 so that their end faces run either perpendicularly or at an angle to the roller axis. In the second variant form the rings 13 a quasi-helix with the advantage that a gap between the rings 13 constantly varies its axial position during rotation and so Markings on an adjacent winding roll can be avoided.

Another possibility of applying the compressible layer 9 on the support body 7 consists of a compressible band material helically on the Wind up support body 7. The non-slip fit of the layer 9 can with the above described techniques can be achieved, e.g. B. by winding the tape in prestressed condition. The roller then consists of a support body 7 with a compressible layer 9 from a helically applied band-shaped Material.

The advantageous influence of a support or support roller 3 compared to known support or Back-up rolls 14 with an elastic, but incompressible outer surface (e.g. from Solid rubber) is explained in FIGS. 7 and 8:

Figure 7 shows a support roller winding machine according to the prior art, in which the outlet-side support roller 14 has an elastic, but incompressible outer surface. Under the bearing load of the winding roll 2, the support roller 14 deforms in the nip 5 elastic. The evasive elastic material forms at both ends of the nip 5 Bumps 15, which protrude radially from the rest of the outer surface. The beads 15 on the nip 5, which significantly influences the winding hardness, increases the effective Radius of the support roller 14, so that the outermost layer of the winding roll 2 in this area is accelerated. This acceleration increases the so-called nip-induced Stretch of the outer layer, d. H. the winding hardness increases. The one through the elastic outer layer intended positive effect, by widening the nip 5 den Contact pressure and thus the winding hardness dependent on the contact pressure significantly reduced and can even be reversed.

Figure 8 shows the conditions when winding with a carrier roll winding machine using a support roller 3 according to the invention:

The compressible layer 9 becomes under the support weight of the winding rolls 2 compressed, their volume decreases. A wide nip 5 without beads or arises with negligible beads on both ends. The contact pressure on the Carrier roller 3 drops due to the widened nip 5, and the nip-induced elongation the outermost layer on the winding roll 2 is reduced. Compared to the known Winding machines can therefore with the same coating weight per meter of roll length lower winding hardness can be wound up. This enables the winding of Winding rolls with a larger final diameter without the paper or cardboard web is damaged or 2 winding errors occur in the winding roll.

The use of a roller according to the invention is not limited to use as a support roller in Carrier roll winding machines are limited, but they can also be beneficial to others Winding machine types as contact rollers on the winding rollers under pressure be used to make large diameter and high quality winding rolls high production speed. In particular, their use as Back-up roll advantageous in so-called back-up roll winding machines which have winding stations in two winding lines on both sides of a central support roller are arranged, to which the individual tracks are fed alternately. Each Winding roll is - such. B. in DE-PS 36 29 024 - of two on trestles the winding stations mounted guide heads, which are part of the Take up the roll weight. The remaining part is taken up by the central backup roller, against which each winding roll rests.

When used as a pressure roller, which is given the reference number 6 in FIGS. 7 and 8 is, with small axial lengths, the roller according to Figures 1 to 6 in the constructed in the manner described above. Because the printing rollers are freely rotatable and are not driven, no rotary drive acts on the shaft journal 8. At Pressure rollers with a large axial length, as z. B. in support roller winding machines are used, the pressure roller preferably consists of individually rotatably mounted Segments to allow independent rotation of the individual segments enable. Printing rollers have diameters that range from 200 to 400 mm are, so usually smaller diameter than support or support rollers.

Claims (15)

1. Carrying, supporting or pressing roller for a winding machine, in particular for winding paper or cardboard webs (1), with a hollow-cylindrical carrying body (7) which is made from rigid material and to the casing of which is applied a deformable layer consisting of a cellular plastic having a multiplicity of uniformly distributed pores, characterized in that the cellular plastic has a compression modulus k of less than 10 MPa, and in that the pores in the layer (9) are partially open and partially closed on themselves.
2. Roller according to Claim 1, characterized in that the layer (9) consists of a cellular elastomer, in particular polyurethane, with a compression modulus between 1 MPa and 5 MPa.
3. Roller according to Claim 1 or 2, characterized in that the size of the pores is less than 5 mm, preferably between 0.05 mm and 1 mm.
4. Roller according to one of Claims 1 to 3, characterized in that the proportion of open pores is 30% to 70%, preferably about 50%.
5. Roller according to one of Claims 1 to 4, characterized in that the layer (9) has a hardness of between 15 and 60 Shore A.
6. Roller according to one of Claims 1 to 5, characterized in that the thickness of the layer (9) is at least 10 mm, preferably between 10 mm and 40 mm.
7. Roller according to one of Claims 1 to 6, characterized in that a wear-resistant elastic running layer (11) is applied to the outside of the compressible layer (9).
8. Roller according to one of Claims 1 to 7, characterized in that the outermost casing layer (9, 11) has grooves (12).
9. Roller according to one of Claims 1 to 8, characterized in that between the compressible layer (9) and the carrying body (7) is arranged a hard base layer (10) which consists of an incompressible material and which is connected to the carrying body (7) in a non-slip manner.
10. Roller according to one of Claims 1 to 9, characterized in that the compressible layer (9) is composed of individual rings (13).
11. Roller according to Claim 10, characterized in that the rings (13) are arranged at a distance of 5 mm - 50 mm from one another.
12. Roller according to Claim 10 or 11, characterized in that the end faces of the rings (13) run obliquely to the roller axis.
13. Roller according to one of Claims 1 to 9, characterized in that the compressible layer (9) consists of a helically applied tape-like material.
14. Winding machine for winding paper or cardboard webs (1), with one or more carrying or supporting rollers (3, 4) and/or pressing rollers (6), characterized in that a roller according to one or more of Claims 1 to 13 is used as carrying or supporting roller (3, 4) and/or pressing roller (6).
15. Carrying-roller winding machine according to Claim 14, with two carrying rollers (3, 4) carrying the weight of the winding roll, with one of the two carrying rollers (3, 4), preferably the carrying roller (3) located on the exit side and not looped by the web (1), being arranged in such a way that its line of contact (5) with the winding rolls (2) is lower than the line of contact of the other carrying roller (4), characterized in that at least the carrying roller (3) with the lower line of contact (5) is constructed according to one or more of Claims 1 to 13.

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