WO1997007281A1 - Roller - Google Patents
Roller Download PDFInfo
- Publication number
- WO1997007281A1 WO1997007281A1 PCT/DE1996/000976 DE9600976W WO9707281A1 WO 1997007281 A1 WO1997007281 A1 WO 1997007281A1 DE 9600976 W DE9600976 W DE 9600976W WO 9707281 A1 WO9707281 A1 WO 9707281A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- roller
- roller according
- soft metal
- paper
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0233—Soft rolls
Definitions
- the invention relates to a roller of the type corresponding to the preamble of claim 1.
- rollers are used in many ways for the treatment of the webs in question, in particular for smoothing and satinizing paper.
- a roller with an elastically flexible coating works together with a heated counter roller with a smoothly polished roller circumference made of steel, as is shown, for example, in DE 30 20 669 A1.
- the resilient cover can be made of plastic of about 10 mm to 30 mm radial thickness.
- the resiliently flexible rollers were designed as so-called paper rollers, in which ring disks made of paper were lined up one behind the other on the roller body and pressed together between end disks made of steel under high axial pressure to form a compact covering. The paper rolls are ground so that they have an exact cylindrical circumferential surface.
- the paper covering has properties that are necessary for the smoothing and satinizing are particularly advantageous.
- the paper rolls are used in the calender or in the calender mostly in alternation with optionally heated hard rolls with a surface made of steel.
- a soft roller and a hard roller are paired with one another in the nip of a calender or a calender.
- the actual smoothing effect occurs on the side of the heated "hard” roller, while on the side of the "soft” roller there is hardly any change in the paper.
- the soft roller is used to ensure a certain flexibility in the nip.
- the incoming paper web has an inner structure with thicker and harder areas. If one smoothed such a paper web between two hard rollers, the so-called lardiness of the paper could occur, in which the harder areas are forcibly leveled and thereby show a certain glassiness and circumstances also darkening. These effects are caused by excessive pressures in the denser areas of the paper, which are avoided by the interaction of a hard roller with a soft roller.
- the soft roller In the known devices for producing smoothness and gloss, the soft roller is actually hardly involved in the desired effect, but only has the function of protecting the paper web. The result of this is that in many cases several roll gaps are necessary to achieve the desired effect.
- the invention has for its object to design a roller of the generic type so that it can be more involved in the treatment process of the web, especially the paper web.
- the soft metal is intended to mean metals, the modulus of elasticity of which is a multiple of the modulus of elasticity of the conventional plastic coatings, but which still have sufficient flexibility and resilience to be able to use them as roller coatings To be able to exert a function of reducing compressive stress peaks in a substrate such as paper, if this is smoothed between a roller covered with the “soft metal” and a hard roller.
- a roller with a metallic coating is far superior to a plastic coating with regard to the heat conduction.
- Such a roller can therefore influence the amount of heat transferred between the web and the roller in a completely different way than a roller provided with a plastic coating or a paper roller.
- This property is particularly effective when the roller is heated from the inside and heat is to be transferred to the web surface through the coating. This works to a considerably greater extent with a metallic coating than with a plastic or paper coating.
- the soft metal is one with a melting point of more than 200 ° C and an elastic modulus of less than 80,000 N / mm z , in particular less than 20,000 N / mm 2 (claim 3).
- the 200 ° C limit is due to the maxi- paint surface temperatures of rollers for the treatment of paper, plastic and the like.
- the upper modulus of elasticity ensures that the elastic compliance is still available to a sufficient extent and its function is comparable to that of a plastic or paper covering.
- Soft metals to be used according to the invention are those such as lead and / or magnesium and / or aluminum (claim 4).
- Lead has a melting point of 327 ° C and an elastic modulus of approximately 17,500 N / mm 2
- magnesium a melting point of approximately 650 ° C and an elastic modulus of approximately 29,000 N / mm 2
- aluminum a melting point of approximately 660 ° C and a modulus of elasticity of approximately 77,000 N / mm 2 .
- Possible lead alloys are e.g. Materials such as hard lead, die-cast alloys based on lead and bearing metal based on lead.
- the thickness of the coating made of the soft metal can correspond approximately to the thickness of a conventional plastic coating and can be 5 mm to 20 mm (claim 7), in particular 10 mm to 15 mm (claim 8).
- the coating can be applied to the roll body in the molten state, for example by means of immersion lead or by methods similar to cladding or by spraying.
- the coating can also be in shape of molded parts which are soldered to the roller body and optionally to one another may be applied to the roller body.
- the winding of strip-shaped extruded profile material from the soft metal for example according to DE 25 45 146 AI, DE 27 22 023 AI or DE 27 26 812 AI.
- rings corresponding to the diameter of the roller body can also be applied to the roller body and soldered to it and to one another at the end faces.
- the roller provided with the coating of the soft metal is then turned over and ground so that it has a clean, closed cylindrical surface.
- this can be dispersion-hardened (claim 11).
- amorphously solidified soft metal which is obtained by letting it melt or by spraying a soft metal melt onto a very cold counter surface, for example a cooled drum (VDI-Nachschreib (1985) No. 22 of May 31st 1985, page 6).
- VDI-Nachschreib (1985) No. 22 of May 31st 1985, page 6.
- the supercooled, i.e. before a crystalline order solidified plate-shaped metal layers can be joined together to form thicker units which give the coating.
- the porous structure gives an elastic resilience which is advantageous for the treatment purpose despite the metallic, i.e. good heat-conducting base material.
- the existing forces concentrate on the material structure between the pores and result in higher deformations corresponding to the higher stresses at a certain force.
- the porous structure can be sintered (Claim 14) are generated.
- a possible embodiment is the sintering together of hollow spheres made of the soft metal on their outer circumference (claim 15), as a result of which the total modulus of elasticity of the cover can be reduced below the value of the compact metal.
- hollow spheres with a relatively small wall thickness are recommended. Aluminum is particularly important for the hollow spheres.
- the porous structure can also be brought about by foaming a metal melt (claim 17) (VDI-Nachzin (1995) No. 37 of September 15, 1995, page 24), which results in a metal sponge.
- porous structure also includes a coating made of a soft metal in the form of microwaves (claim 18), which are obtained by correspondingly deforming metal foils and are known from catalyst technology.
- the micro-honeycombs for example having a hexagonal cross-section, are expediently with their axes radial to the roller.
- the webs particularly if they are made of paper and contain mineral components, exercise considerable wear on the working roller circumference out.
- the bare soft metal surface would not withstand this attack for long.
- the coating itself has a thin coating of a wear-resistant material (claim 22), e.g. made of hard materials (claim 23).
- Suitable hard materials are, for example, carbide materials such as tungsten carbide, chromium carbide and titanium carbide, or oxidic materials such as Al 2 0 3 , AlTi0 3 / titanium oxide, chromium oxide and the like. Methods are known with which such coatings can be applied to substrates in a thin layer without particularly high temperatures. Such coatings are successfully used, for example, in cutting materials.
- the materials mentioned are very brittle. In a thin layer, however, they are very elastic and can follow the deformations of the underlying soft metal without breaking or splintering. Since this elasticity depends on the thickness of the layer and the associated freedom from defects in the structure, a thickness of the coating of the coating of less than 50 my, in many cases even less than 10 my, is recommended. Claim 25).
- the starting point of the invention and its essential application is the smoothing of paper.
- the invention is also embodied in a smoothing unit for treating paper according to claim 26.
- the treatment effect can be increased if two rollers of the type according to the invention work against a heated steel roller (claim 27).
- FIG. 1 shows a section indicated by I in FIG. 2 from the edge region of a roller, the cover being cut in a plane passing through the axis;
- FIG. 2 shows a view of a pair of rollers, the top roller of which is designed according to FIG. 1.
- the roller designated 10 as a whole in FIG. 1 comprises a cylindrical roller body 1.
- This roller body 1 can be a solid roller with and without internal channels for heating.
- the roller body 1 can, however, also be the hollow roller of a deflection-controllable roller which is hydraulically supported from the inside and can be heated from the inside by means of the hydraulic fluid used for support or an additional heat transfer fluid.
- roller body 1 In Fig. 1, only a region near the surface of the cylindrical roller body 1 is shown in the detail. In practice, the roller body 1 can have a diameter of 500 to 1000 mm.
- the roller body 1 carries a coating 2 of constant thickness over the entire surface, which in the exemplary embodiment consists of a lead alloy that is soldered to the interface 3 with the outer circumference of the cylindrical roller body 1, which is indicated by the thicker line 6 should be hinted at. Soldering is only considered if the coating 2 was previously present as a molded part. If the coating 2 is applied in the molten state, 6 means the connecting surface to the cylindrical roller body 1.
- the thickness is 7 of the coating 2, ie its radial extension, 12 mm.
- the coating 2 has on its outer circumference a thin coating 4 of tungsten carbide, the outside 5 of which forms the working roller circumference and is intended to reduce the wear attack on the soft lead alloy of the coating 2.
- the thickness of the coating 4 is exaggerated in FIG. 1. In fact, it is only about 10 My.
- FIG. 2 shows an application of the roller 10 in the form of a two-roll smoothing unit 100 with the rollers 10 and 20, which together form a roller gap 8 through which a paper web 9 is passed.
- the upper roller 10 can be deflected and heated and has a coating 2 made of a lead alloy with a wear-resistant coating 4, as shown in FIG. 1.
- the lower roller 20 is a heatable roller with a polished circumference made of cast iron.
- the coating 2 if it consists of a lead alloy, conducts the Heat from the inside of the heated roller 10 to the surface of the paper web practically in the same way as is the case with the hard roller 20 with the steel surface.
- the total amount of heat transferred to the paper web is significantly increased and, in particular, there is also an action on the rear side of the paper web 9 opposite the roller 20, which also brings about an increase in smoothness there.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96919626A EP0843758B1 (en) | 1995-08-11 | 1996-06-04 | Roller |
JP9508799A JPH11509279A (en) | 1995-08-11 | 1996-06-04 | roll |
DE59604698T DE59604698D1 (en) | 1995-08-11 | 1996-06-04 | ROLLER |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995129711 DE19529711A1 (en) | 1995-08-11 | 1995-08-11 | Roll for glazing paper and other web materials has a flexible surface jacket - made of a soft metal and a surface coating of very hard metal or other material |
DE29607233.8 | 1996-04-22 | ||
DE19529711.3 | 1996-04-22 | ||
DE29607233U DE29607233U1 (en) | 1996-04-22 | 1996-04-22 | roller |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997007281A1 true WO1997007281A1 (en) | 1997-02-27 |
Family
ID=26017645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/000976 WO1997007281A1 (en) | 1995-08-11 | 1996-06-04 | Roller |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0843758B1 (en) |
JP (1) | JPH11509279A (en) |
CA (1) | CA2229214A1 (en) |
DE (1) | DE59604698D1 (en) |
WO (1) | WO1997007281A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19757474A1 (en) * | 1997-12-23 | 1999-06-24 | Voith Sulzer Papiertech Patent | Paper calender |
EP1057931A2 (en) * | 1999-06-02 | 2000-12-06 | Voith Sulzer Papiertechnik Patent GmbH | Soft roll and process for making such a roll |
WO2001097989A1 (en) * | 2000-06-23 | 2001-12-27 | Alcan International Limited | A work roll for and a method of producing metal foil |
EP1334778A3 (en) * | 2002-02-08 | 2006-06-28 | Fuji Photo Film Co., Ltd. | Rod for a coating device, and process for producing the same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1739231A1 (en) * | 2005-07-02 | 2007-01-03 | M-real Oyj | Cast coating device |
CN107923125B (en) * | 2015-07-02 | 2020-09-11 | 福伊特专利有限公司 | Component of a machine for producing and/or treating a fibrous web and method for producing a coating of a component |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5023985A (en) * | 1989-02-28 | 1991-06-18 | Valmet Paper Machinery Inc. | Coated roll for a paper making machine |
US5171404A (en) * | 1990-11-30 | 1992-12-15 | S. D. Warren Company | Method and apparatus for calendering paper with internally heated roll |
-
1996
- 1996-06-04 JP JP9508799A patent/JPH11509279A/en active Pending
- 1996-06-04 DE DE59604698T patent/DE59604698D1/en not_active Expired - Fee Related
- 1996-06-04 WO PCT/DE1996/000976 patent/WO1997007281A1/en active IP Right Grant
- 1996-06-04 CA CA002229214A patent/CA2229214A1/en not_active Abandoned
- 1996-06-04 EP EP96919626A patent/EP0843758B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5023985A (en) * | 1989-02-28 | 1991-06-18 | Valmet Paper Machinery Inc. | Coated roll for a paper making machine |
US5171404A (en) * | 1990-11-30 | 1992-12-15 | S. D. Warren Company | Method and apparatus for calendering paper with internally heated roll |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19757474A1 (en) * | 1997-12-23 | 1999-06-24 | Voith Sulzer Papiertech Patent | Paper calender |
US6204487B1 (en) | 1997-12-23 | 2001-03-20 | Voith Sulzer Papiertechnik Patent Gmbh | Method and device for a paper calender |
EP1057931A2 (en) * | 1999-06-02 | 2000-12-06 | Voith Sulzer Papiertechnik Patent GmbH | Soft roll and process for making such a roll |
EP1057931A3 (en) * | 1999-06-02 | 2001-11-21 | Voith Paper Patent GmbH | Soft roll and process for making such a roll |
US6896647B1 (en) | 1999-06-02 | 2005-05-24 | Voith Sulzer Papiertechnik Patent Gmbh | Elastic roller and process for producing same |
WO2001097989A1 (en) * | 2000-06-23 | 2001-12-27 | Alcan International Limited | A work roll for and a method of producing metal foil |
EP1166906A1 (en) * | 2000-06-23 | 2002-01-02 | Alcan International Limited | A work roll for and a method of producing metal foil |
US7200935B2 (en) | 2000-06-23 | 2007-04-10 | Novelis, Inc. | Work roll |
EP1334778A3 (en) * | 2002-02-08 | 2006-06-28 | Fuji Photo Film Co., Ltd. | Rod for a coating device, and process for producing the same |
Also Published As
Publication number | Publication date |
---|---|
CA2229214A1 (en) | 1997-02-27 |
DE59604698D1 (en) | 2000-04-20 |
EP0843758B1 (en) | 2000-03-15 |
EP0843758A1 (en) | 1998-05-27 |
JPH11509279A (en) | 1999-08-17 |
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