WO2009106225A1

WO2009106225A1 - Roller

Info

Publication number: WO2009106225A1
Application number: PCT/EP2009/000898
Authority: WO
Inventors: Carsten Sohl
Original assignee: Schäfer Composites GmbH
Priority date: 2008-02-25
Filing date: 2009-02-10
Publication date: 2009-09-03

Abstract

The invention relates to a roller (20) used as a calender roller for paper treatment. Said roller comprises an outer coating (22) containing PEEK fibres (23) embedded in resin (24) in order to improve the mechanical fracturing properties thereof. As the elasticity module and abrasion behaviour of the fibres are similar to that of the resin (24), the surface (21) of the coating wears in a uniform manner and has a consistently high quality. Phenol resin or PAI can be used as the fibrous material as an alternative to PEEK.

Description

Description roller

Field of application and state of the art

The invention relates to a roller, as it is used in particular in the Papierbe- handling, especially as a calender roll. The roller has an outer covering with fibers embedded in an embedding material, for example in an adhesive or a resin. Such coatings of composite materials to make the roller resistant, or robust. At the same time such a coating should be very smooth, so that, for example, thus treated paper is smooth, especially in the production of so-called coated papers.

The problem with such coverings with a fiber content is, especially with high-conductivity fibers such as aramid fibers or the like., That the pads or especially the embedding material wear out slowly or be removed. It may be that due to different material properties fibers as a piece or with a piece of their length, so to speak, are torn out of the coating as a whole, if they are partially or largely free. However, this causes, so to speak, a hole arises where previously the fiber was embedded in the embedding material, and thus the desired and required smooth surface of the covering is no longer guaranteed. The working quality of such a roll is then deteriorated.

Task and solution

The invention has for its object to provide an aforementioned roller, can be avoided with the problems of the prior art and in particular a better abrasion behavior of a covering can be achieved. This object is achieved by a roller with the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference. Furthermore, the wording of priority applications DE 102008011496.0 and DE 102008011498.7 of February 25, 2008 of the same Applicant are incorporated by express reference into the content of the present description.

According to the invention, it is provided that at least some of the fibers comprise a material of the following group: PEEK material, phenolic resin or PAI. The so-called PEEK material is polyetheretherketone, and PAI are polyamideimides.

Advantageously, all the fibers of the covering on such a material from this group or consist thereof, particularly advantageous PEEK material. Preferably, at least a part of the fibers consists entirely of the material of this group, wherein in a particularly preferred embodiment of the invention, all the fibers of the coating consist entirely of such a material.

PEEK material is known in fiber form and is offered, among others, by the manufacturers Zyex or Swicofil. The advantage of the invention is that fibers made of PEEK can have an E-modulus of about 4000 to 6000, which fits very well to the modulus of elasticity of the resin or epoxy resin as the embedding material. Thus, the abrasion properties of fibers and resin are similar, so that the mentioned problem of tearing individual fibers or pieces of fiber is minimized, possibly even completely eliminated. In this case, the PEEK fibers and the resin as embedding material of their properties, in particular in terms of Abriebeigenschaften or abrasion resistance, matched to each other or these are chosen as equal as possible. Preference is given here to usual working temperatures of the rollers or the linings and covers respected and matched the material properties to these temperatures. This is a further advantage of PEEK material, since it has particularly good abrasion resistance even at temperatures well above room temperature, as can occur in papermaking.

The positive effect on the fracture mechanical properties in epoxy resin as a material for the cover is relatively good due to the addition of PEEK fibers. Although they are far from reaching, for example, aramid fibers zoom, but are still significantly better than that of conventional plastic fibers such as polyester or polyamide.

Alternatively, the fibers may be planar resin, most preferably phenolic resin or PAI. One possibility for such fibers of phenolic resin are so-called kynol fibers, as can be obtained, for example, via Kynol Europa GmbH.

In a further embodiment of the invention it can be provided that the embedding material is a phenolic resin or even the same phenolic resin. Alternatively, the potting material may be an epoxy resin.

If, in the embodiment of the invention, at least some of the fibers have the same material as the embedding material or a material with very similar properties with regard to abrasion resistance, then it can be achieved here that the covering is indeed composed of different constituents. After curing, however, it consists, so to speak, of the same material and thus has continuous and identical properties. It has even been shown that at one Microsection through the covering the fibers hardly or not at all can be distinguished from the embedding material, so that they have dissolved in terms of the properties of the finished covering, so to speak in the embedding material or absorbed it. The main advantage of the use of these fibers then lies in the supportive effect for a simpler production process of the covering or cover in order to avoid a complex casting of a covering of a single material.

Advantageously, fibers with a diameter of 1 .mu.m to 20 .mu.m are used. Their length can be less than a few cm in common ranges, for example, less than a few millimeters. For certain coverings also endless fibers can be used, which will be explained in more detail.

For the production or for the construction of the cover can be provided that the fibers are mixed either the covering or the embedding material individually or loosely, so to speak as bulk material or without structure. In this case, the embedding material can then be processed as a cast material.

Alternatively and preferably, the fibers can be processed as rovings or nonwoven fabric for the construction of the cover, for example, as multiple wound on the roll or a roll base fleece. It is soaked with embedding material. The fibers are then advantageously quite short and arranged completely arbitrary, which is then referred to as wet nonwoven. With very long or almost infinitely long fibers so-called spun-laced non-woven can be produced. Here are the fibers, which can then be almost infinitely long, substantially in the longitudinal direction of the web. A nonwoven can also form a kind of very loose felt, for example in the manner of stripes or mats. These are examples of so-called non-woven cover materials. The volume fraction of fibers on the finished cover, in particular of fibers entirely of PEEK material on the one hand or of embedding material on the other hand, can be from 3% by volume to 15% by volume. Advantageously, it is 5 vol% to 10 vol%. In the case of said wet nonwoven, the volume fraction is rather lower with about 3% by volume. For the spun-laced nonwoven it is significantly higher, for example 11% by volume.

Under certain circumstances, a mixture of different fibers may be provided, for example with the addition of the aforementioned aramid or carbon fibers to the PEEK fibers according to the invention. The proportions may be about the same size, for example.

With respect to other parameters such as length and / or diameter of the fibers and fiber content and thickness of the covering or covering conventional parameters can be selected, as they are known for example from DE 10 2004 057480 A1.

These and other features will become apparent from the claims but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections and subheadings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show: 1 shows a section through a roller according to the prior art with fibers in the covering, FIG. 2 shows the roller from FIG. 1 with parts of the fibers broken off from the covering, FIG. 3 shows a section through a roller according to the invention in FIG

In contrast to FIG. 2 evenly worn PEEK fibers in the covering, FIG. 4 shows a section through a further roll according to the invention

Coating of phenolic resin and fibers of phenolic resin with a disordered fiber composite and Fig. 5 shows a further inventive roller with a coating of

Phenolic resin and phenolic resin fibers, with the fibers wound up in an orderly manner.

Detailed description of the embodiments

In Fig. 1, a roller 11 according to the prior art is shown in section. The roller 11 has an outer side or surface 12 of a covering 13. The pad 13 consists of fibers 14 which are embedded in resin 15. The fibers 14 are made of aramid or kevlar, for example. The resin 15 is advantageously epoxy resin. The illustration in Fig. 1 is of course only to be understood schematically, since usually the proportion of fibers 14 in the coating 13 is considerably higher, for example, with a share of 3Vol-% to 15Vol-%.

It can be seen how the two fibers 14 lying on the surface 12 project beyond this surface. Again, this is only schematically and greatly exaggerated by scale. It should make clear that the fibers 14 on the one hand and the resin 15 on the other hand wear to different degrees. In Fig. 2, for the prior art roller 11, it is shown how pieces 14 ^' on the left fiber 14 and the remainder 14 ^"of the right fiber 14 break out of the pad 13. At the locations which the fiber pieces 14 ^' and 14 ^" are broken out, resulting in unevenness 16. These bumps 16 cause an unfavorable roughness of the roller 11, as described above, which is considered to be very negative. In some cases, the supernatants of the fibers 14 that can be recognized in FIG. 1 also interfere with the surface 12.

In Fig. 3, a roller 20 according to the invention is shown, and it also has a surface 21, which is formed by a coating 22. The lining 22 contains the fibers 23 according to the invention made of PEEK material. These PEEK fibers 23 are embedded in resin 24, for example, epoxy resin similar to the prior art roller 11. Incidentally, the roller 20, as far as the thickness of the pad 22, dimensions of the fibers 23 and fiber content is concerned, be formed as described above or similar as known from the prior art.

From FIG. 3, the advantage of the PEEK fibers 23 used can be seen, namely that the two fibers 23 lying on the surface 21 do not break off or break away, as shown in FIG. 2 for the prior art, but are uniformly worn As well as the resin 24 of the other coating 22. As a result, especially the particularly disturbing bumps 16 of the prior art shown in FIG. 2 are avoided. However, the supernatants of the prior art fibers 14 according to FIGS. 1 and 2 can also be avoided. Thus, it is shown how with the invention, the surface quality and thus the quality of work of a roller 20 can be significantly improved. In Fig. 4, a roller 111 is shown having a surface 112 with which the roller 111 can be pressed against another roller, such as a calender roller, to machine intermediate paper. The roller 111 has a covering 113, which forms the surface 1 12. The pad 113 is made of fibers 114 embedded in a resin 115. The fibers 114 may also be made of PEEK material, similar to that shown in FIG. 2, or of phenolic resin or PAI.

The fibers 114 are embedded here substantially disorderly in the lining 113 or in the resin 115. For example, as previously described, the felted fibers 114 may be wound onto a core, not shown, underlying the pad 113, along with the resin 215. Of course, the density or volume fraction of the fibers 114 to the resin 115 may be even greater, in particular, the fibers may be much denser.

By the hatching which uniformly passes through resin 115 and fibers 114, the advantageous aspect of the invention is to be illustrated that it is not just the same material in each case. As has been described above as an advantageous embodiment, the fibers 114 in the covering 1 13 compared to the resin 115 can not be made, so to speak, since they both consist of the same material and therefore, of course, have the same properties.

FIG. 5 shows a further roller 211 according to the invention. It has a surface 212 which is formed by a coating 213. The pad 213 contains, basically similar to FIG. 4, fibers 214 and resin 215. In contrast to FIG. 4, however, here the fibers 214 are applied in an ordered manner or aligned approximately in the circumferential direction of the roller 21 1. For this purpose, they can be applied, for example, as a non-woven or as a rectified fiber composite. Otherwise, the production processes of the roller 111 differ according to FIG. as the roller 311 of FIG. 5 is not. Both production methods can be as explained above, namely that on a not shown, under the respective pad 113 and 213 lying core, in particular of metal, the fibers 114 and 214 are wound and embedded in resin 115 and 215, respectively.

Claims

claims

A roll (20, 111, 211), in particular for paper treatment, such as a calender roll, having an outer covering (22, 113, 213) comprising fibers (23, 14, 214) which are embedded in an embedding material (24 , 115, 215) such as glue or resin (24, 115, 215) are embedded, characterized in that at least a part of the fibers (23, 114, 214) comprises a material of the following group: PEEK material, phenolic resin or PAI.

2. Roll according to claim 1, characterized in that all the fibers (23, 114, 214) comprise the material of the following group: PEEK material, phenolic resin or PAI have.

3. Roll according to claim 1 or 2, characterized in that at least a part of the fibers (23, 114, 214) consists entirely of the material of the following group: PEEK material, phenolic resin or PAI, wherein preferably all fibers ( 23, 114, 214) consist entirely of this material.

4. Roller according to one of the preceding claims, characterized in that the Abriebeigenschaften or the abrasion resistance of the embedding material (24, 115, 215) are similar to those of the fibers (23, 114, 214), preferably the same, in particular the same of fibers consisting entirely of the material of the following group: PEEK material, phenolic resin or PAI, in particular the embedding material (24, 115, 215) being the same as that of the fibers.

5. Roll according to one of the preceding claims, characterized in that the embedding material (24, 115, 215) is other than that of the fibers (23, 1 14, 214).

6. Roll according to one of the preceding claims, characterized in that the fracture mechanical properties of the fibers (23, 114, 214) made of the material of the following group: PEEK material, phenolic resin or PAI; are better than the usual plastic fibers made of polyester or polyamide or the like ..

7. Roller according to one of the preceding claims, characterized in that the volume fraction of the fibers (23, 114, 214) is 3 vol% to 15 vol% of the lining (22, 113, 213), preferably 5 vol% to 10% by volume.

8. Roller according to one of the preceding claims, characterized in that the diameter of the fibers (23, 114, 214) is 5 .mu.m to 20 .mu.m.

9. Roller according to one of the preceding claims, characterized in that the modulus of elasticity of the fibers (23, 114, 214) is about 6000.

10. Roller according to one of the preceding claims, characterized in that the fibers (23, 114, 214) the lining (22, 113, 213) and the embedding material (24, 115, 215) in the manufacture of one or Loosely mixed are used as casting material.

11. Roller according to one of claims 1 to 9, characterized in that the fibers (23, 114, 214) the covering (22, 1 13, 213) and the embedding material (24, 115, 215) in the production as fleece are attached, in particular as multiple on the roll (20, 111, 211) wound nonwoven.

12. Roller according to one of claims 1 to 9, characterized in that the fibers (23, 114, 214) as rovings in the covering (22, 113, 213) or the embedding material (24, 115, 215) at embedded in the production, in particular as multiple times on the roll (20, 111, 211) wound rovings.