CA2229214A1 - Roller - Google Patents
Roller Download PDFInfo
- Publication number
- CA2229214A1 CA2229214A1 CA002229214A CA2229214A CA2229214A1 CA 2229214 A1 CA2229214 A1 CA 2229214A1 CA 002229214 A CA002229214 A CA 002229214A CA 2229214 A CA2229214 A CA 2229214A CA 2229214 A1 CA2229214 A1 CA 2229214A1
- Authority
- CA
- Canada
- Prior art keywords
- roller
- coating
- roller according
- soft metal
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
A roller (10) for treating webs of paper, cardboard, plastic, textiles and the like has a cylindrical roller body (1) and a coating (2) of a lead alloy applied to it and forming the processing surface (5) of the roller. The coating (2) is in turn coated with a layer (4) of hard materials providing wear resistance.
Description
r ~ CA 02229214 1998-02-10 -E, ~ T~S a~ ~ [38800/477]
T~ TF~AN~LAT~ON
~OLLER
The invention relates to a roller of the type corresponding to the preamble of Claim 1.
Such rollers are used in many different ways for treating the webs in question, particularly for glazing and satin-fini~hin~ paper. In this case, a roller with an 5 elastically resilient coating works together with a heated counter-roller that has a smoothly polished roller circumference made of steel, as presented in DE 30 20 669 Al, for example. The elastically resilient coating can be comprised of plastic with a radial thickness of about 10 mm to 30 mm. In earlier times, in particular, the elastically resilient rollers were structured as so-called paper rollers, ring-shaped disks 10 of paper being lined up one behind the other on the roller body, and compressed between end disks made of steel, under high axial pressure, to form a compact surface.
The paper rollers are buffed, so that they have a precise cylindrical circumference surface. The paper covering has properties which are particularly advantageous for the process of glazing or satin-fini~hin~ paper. In the calender or in the glazing unit, the 15 paper rollers are generally used alternating with hard rollers with a steel surface, which are heated if necessary. Predomin~ntly, therefore, a soft roller and a hard roller are paired together in the roller nip of a calender or a glazing unit.
The actual glazing effect occurs on the side of the heated "hard" roller, while hardly any change in the paper is found on the side of the "soft" roller. The soft roller 20 is used to ensure a certain resilience in the roller nip. The incoming paper web has an int~rn~l structure with thicker and harder spots. If such a paper web were to be glazed between two hard rollers, a so-called grease effect could occur in the paper, with the TRANSLATION
-harder spots being forcibly made level and therefore demonstrating a certain g~ cinesc and, under some circumstances, even a dark discoloration. These effects come about due to overly high pressure at the denser spots of the paper, which are avoided by the interaction of a hard roller with a soft roller.
In order to achieve the necessary overall effect on the paper web, it is alreadyknown from DE 32 01 635 C2 to have two pairs of rollers act on the paper web, one immediately after the other, where the contact of the soft roller can take place from the same side of the paper web if the aim is to protect the soft coverings which are subject to the milling work, and the desired effect is to be achieved in two steps, or from different sides if the paper is to be given the desired surface improvement on both sides at the same time.
In the known devices for creating glaze and shine, the soft roller actually hardly participates at all in the desired effect, but rather only has the function of protecting the paper web. This has the result that in many cases, several roller nips are necessary in order to achieve the desired effect.
The invention is based on the task of structuring a roller of the type indicated, in such a way that it can be included to a greater extent in the treatment process of the web, particularly the paper web.
This task is accomplished by means of a roller of the type corresponding to the preamble of Claim 1.
With regard to elastic resilience, it is possible to ensure that the conditions are similar to those for a roller provided with a plastic coating, for example of harder polyurethane, by means of a suitable selection of the soft metal. In the presentconnection, the term "soft metal" is intended to mean metals whose modulus of elasticity amounts to several times the modulus of elasticity of the usual plastic coatings, but which still possess sufficient resilience and elastic memory to be able to exercise the function of reducing pressure stress peaks in a substrate such as paper, when used as a roller coating, if this paper is being glazed bet~veen a roller coated with "soft metal" and a hard roller.
TRANSLATION
The decisive point of the soft metal coating, however, is that a roller with a metal coating is far superior to a roller with a plastic coating with regard to heat conductivity. 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 5 with a plastic coating, or a paper roller.
This property is particularly effective if the roller is heated from the inside and heat is to be transferred to the web surface through the coating. This works to a much greater extent in the case of a metal coating than in the case of a plastic or paper coating.
In accordance with Claim 2, possible soft metals are those with a melting point of more than 200 ~C and a lrnodulus of elasticity of less than 80,000 N/mm2, particularly less than 20,000 N/mm2 (Claim 3).
The 200 ~C limit is determined by the maximum surface temperatures of rollers for treating paper, plastics, and the like which occur at present. The upper limit 15 for the modulus of elasticity ensures that the elastic resilience is still present to a sufficient degree and is comparable in its function to a coating of plastic or paper.
Important exemplary embodiments for soft metals to be used according to the invention are those such as lead and/or m~gnesium and/or alllminllm (Claim 4). Lead has a melting point of 327 ~C and a modulus of elasticity of about 17,500 N/mm2,20 magnesium has a melting point of about 650 ~C and a modulus of elasticity of about 29,000 N/mm2, alllminnm has a melting point of approximately 660 ~C and a modulus of elasticity of about 77,000 N/mm2.
For an optimum adjustment of the mechanical properties of the coating, pure metal will not be used in most cases, but rather a suitable lead and/or magnesium 25 and/or alllminllm alloy will be used (Claim 5).
Possible lead alloys are, for example, materials such as hard lead, diecasting alloys with a lead base, and bearing metal with a lead base.
It is also possible to use an alloy which contains lead and/or magnesium, in which lead and/or magnesium and/or aluminum are not the base material, but rather TRANSLATION
, , CA 02229214 1998-02-10 only an additive to an alloy structured in some other way (Claim 6).
The thickness of the soft metal coating can correspond approximately to the thickness of a conventional plastic coating, and amount to 5 mm to 20 mrn (Claim 7), particularly 10 mm to 15 mm (Claim 8).
For producing the lead coating on the cylindrical roller body, all suitable known methods can be used. For example, in accordance with Claim 9, the coating can be applied to the roller body in the melted, fluid state, for example by way of lead dipping, or by means of processes similar to application welding, or by spraying.
In accordance with Claim 10, however, the coating can also be applied to the 10 roller body in the forrn of molded parts, which are soldered to the roller body and, if necessary, to each other.
One possibility, for example, is winding on strip-shaped extruded profile material made of the soft metal, in the manner of DE 25 45 146 Al, DE 27 22 023 Al, or DE 27 26 812 Al. However, rings which correspond to the diameter ofthe roller15 body can also be put on and soldered to the latter and to each other, at their faces.
Finally, it is also possible to bend plates in accordance with the circumference of the roller body and to affix them there.
The roller provided with the coating of soft metal is subsequently turned and buffed, so that it obtains a clean, sealed cylindrical surface.
To improve the elastic properties of the soft metal, the latter can be dispersion-hardened (Claim 11).
An ~ltern~tive possibility consists of using amorphously solidified soft metal, which is obtained by leaving a soft metal melt on a very cold counter-surface, for example a cooled drum, or spraying it on (VDI-Nachrichten (1985), Issue 22 datedMay 31, 1985, page 6). The undercooled metal layers, i.e. the flat metal layers which solidified before reaching a crystalline arrangement, can be joined together to form thicker units which result in the coating.
An important further development is the subject matter of Claim 13. The porous structure results in advantageous elastic resilience for the treatment purpose, TRANSLATION
because of the reduced bealing cross-section, in spite of the metallic material, i.e.
material with good heat conductivity. The existing forces are concentrated on the material framework present between the pores, and result in higher deformations there, in accordance with the higher stresses at a specific force.
The porous structure can be produced by means of a sintering process (Claim 14). A possible embodiment is ~interin~ together small hollow spheres of the soft metal at their outside circurnference (Claim 15), which makes it possible to lower the total modulus of elasticity of the coating below the value of the compact metal. In order to make this particularly effective, small hollow spheres with a relatively low 10 wall thickness according to Claim 16 are recommencle-l Alnmim-m is of particular significance for the small hollow spheres.
The porous structure can also be brought about by foaming up a metal melt (claim 17) (VDI-Nachric*ten (1995), No. 37 dated September 15, 1995, page 24), which results in a metal sponge.
However, a coating of a soft metal in the form of micro-honeycombs (Claim 18) is also included in the concept of the porous structure, these can be obtained by corresponding deformation of metal foils and are known from catalyst technology. It is practical if the micro-honeycombs, which have a hexagonal cross-section, for exarnple, stand radial to the roller with their axis.
In the porous material, the remS~ining cross-sections and therefore the heat conductivity are reduced as compared with a solid m~tf~ri~l In order to balance this out, it can be recommenclecl that the pores are at least partially filled with a heat-conductive material different from the m~teri~l ofthe coating (Claim 19).
In most instances, the rollers in question work at elevated temperatures in the 25 range of up to about 200 ~C. They cool down to ambient temperature during thebreaks in operation. In order not to have severe heat stresses occur in connection with these temperature differences, which could cause the coating to come loose from the cylindrical roller body over time, the development according to Claim 20 is recommen(le~l, where an alllmimlm material is suited as the carrier material for the TRANSLATION
possible soft metals (claim 21).
The webs exert a significant wear effect on the processing surface of the roller, particularly if they consist of paper and contain mineral components. The unprotected soft metal surface would not withstand this effect for long.
It is therefore recommen~led that the coating in turn have a thin coating of a wear-resistant material (Claim 22), e.g. hard materials (Claim 23).
Possible hard m~tPri~l~ are, for example, carbide m~t~ri~lc such as tnn~t~n carbide, chrome carbide, and ~il~iulll carbide, or oxide materials such as Al203, AlTiO3, liL~~ l oxide, chrome oxide, and the like. Processes are known to enable10 application of such coatings on substrates, in a thin layer, without using particularly high temperatures. Such coatings are used successfully, for example, for cuttingmaterials.
In the massive form, the m~teri~l~ mentioned are very brittle. In a thin layer, however, they are very elastic and are able to follow the deformations of the soft metal 15 nntlernP~th them without breaking or splintering. Since this elasticity depends on the thinne.~ of the layer and the accompanying freedom of the structure from defects, a thickness of the coating layer of less than 50 My is recommenclc~l, in accordance with Claim 24, in many cases even one of less than 10 My (Claim 25).
The point of dt;~al lu.~ of the invention and its significant case of application is 20 paper-gl~7ing The invention is also embodied in a gla7ing unit for treating paper, in accordance with Claim 26.
Here, the known "soft" roller with a plastic coating, as in DE 30 20 669 A1 and DE 32 01 635 C2, for example, is replaced with a roller with a coating of a soft metal, which allows significantly greater heat transport from the interior of the heated roller 25 to the back of the paper web which lies opposite the heated steel roller. In this way, a treatment effect is also brought about on this back of the paper web, and the "soft"
roller is included in the treatment function. In some cases, this will make it possible to avoid double arrangements of roller pairs to achieve a sufficient one-sided or double-sided effect, and to achieve sufficient gla_ing for some types of paper in only one roller TRANSLATION
. CA 02229214 1998-02-10 nip.
The tre~tment effect can be inten~ified if two rollers of the type according to the invention work against one heated steel roller (claim 27).
The drawing shows an exemplary embodiment of the invention.
Fig. 1 shows a detail of the border region of the roller, indicated in Fig. 2 with I, where the coating is cut open in a plane passing through the axis;
Fig. 2 shows a view of a roller pair, the top roller being structured according to Fig. 1.
The roller indicated as a whole with 10 in Fig. 1 comprises a cylindrical rollerbody 1. This roller body 1 can be a solid roller with or without internal channels for hc~ting However, roller body 1 can also be a hollow roller of a deflection-controlled roller, which is hydraulically supported from the inside and which can be heated from the inside by means of the hydraulic fluid which serves to support it, or by means of an additional heat carrier fluid.
Fig. 1 shows only a detail of a region of cylindrical roller body 1, close to the surface. In practice, roller body 1 can have a diameter from 500 to 1000 mm.
Roller body 1 carries a coating 2 with a uniform thickness over the entire surface, which is comprised, in the exemplary embodiment, of a lead alloy which is soldered at border surface 3 to the outer surface of cylindrical roller body 1, as indicated by heavier line 6. Soldering is only possible if coating 2 was previously present as a molded part. If coating 2 is applied in the melted, fluid state, 6 refers to the connection surface with cylindrical roller body 1.
In the exemplary embodiment shown, thickness 7 of coating 2, i.e. its radial çxr~n~e, is 12 mm.
On its outside circumference, coating 2 possesses a thin coating 4 of tlmp~ten carbide, outside 5 of which forms the processing surface of the roller and is intçn(le~l to reduce the wear effect on the soft lead alloy of coating 2. The thickness of coating 4 is shown in exaggerated manner in Fig. 1. In fact, it is only on the order of about 10 My.
Fig. 2 shows a case of use of roller 10, in the form of a two-roller glazing unit TRANSLATION
. CA 02229214 1998-02-10 .
100 with rollers 10 and 20, which together form a roller nip 8, through which a paper web 9 is passed.
Top roller 10 can be deflection-controlled and heated, and possesses a coating 2of a lead alloy with a wear-resistant coating 4, as shown in Fig. 1. Bottom roller 20 is 5 a roller which can be heated, with a polished circumference made of chilled cast iron.
While there was hardly any participation of the soft roller in the glazing process in the known roller pairs in glazing units, in which one roller had a coating made of plastic, because of its poor heat conductivity, coating 2, if it consists of a lead alloy, conducts the heat from the interior of heated roller 10 to the surface of the paper web 10 practically in the same manner as is the case for hard roller 20 with the steel surface.
In this way, the total amount of heat transferred to the paper web is significantly increased, on the one hand, and in particular, an effect on the back of paper web 9, which lies opposite roller 20, also takes place, resulting in increased smoothness there, also.
TRANSLATION
T~ TF~AN~LAT~ON
~OLLER
The invention relates to a roller of the type corresponding to the preamble of Claim 1.
Such rollers are used in many different ways for treating the webs in question, particularly for glazing and satin-fini~hin~ paper. In this case, a roller with an 5 elastically resilient coating works together with a heated counter-roller that has a smoothly polished roller circumference made of steel, as presented in DE 30 20 669 Al, for example. The elastically resilient coating can be comprised of plastic with a radial thickness of about 10 mm to 30 mm. In earlier times, in particular, the elastically resilient rollers were structured as so-called paper rollers, ring-shaped disks 10 of paper being lined up one behind the other on the roller body, and compressed between end disks made of steel, under high axial pressure, to form a compact surface.
The paper rollers are buffed, so that they have a precise cylindrical circumference surface. The paper covering has properties which are particularly advantageous for the process of glazing or satin-fini~hin~ paper. In the calender or in the glazing unit, the 15 paper rollers are generally used alternating with hard rollers with a steel surface, which are heated if necessary. Predomin~ntly, therefore, a soft roller and a hard roller are paired together in the roller nip of a calender or a glazing unit.
The actual glazing effect occurs on the side of the heated "hard" roller, while hardly any change in the paper is found on the side of the "soft" roller. The soft roller 20 is used to ensure a certain resilience in the roller nip. The incoming paper web has an int~rn~l structure with thicker and harder spots. If such a paper web were to be glazed between two hard rollers, a so-called grease effect could occur in the paper, with the TRANSLATION
-harder spots being forcibly made level and therefore demonstrating a certain g~ cinesc and, under some circumstances, even a dark discoloration. These effects come about due to overly high pressure at the denser spots of the paper, which are avoided by the interaction of a hard roller with a soft roller.
In order to achieve the necessary overall effect on the paper web, it is alreadyknown from DE 32 01 635 C2 to have two pairs of rollers act on the paper web, one immediately after the other, where the contact of the soft roller can take place from the same side of the paper web if the aim is to protect the soft coverings which are subject to the milling work, and the desired effect is to be achieved in two steps, or from different sides if the paper is to be given the desired surface improvement on both sides at the same time.
In the known devices for creating glaze and shine, the soft roller actually hardly participates at all in the desired effect, but rather only has the function of protecting the paper web. This has the result that in many cases, several roller nips are necessary in order to achieve the desired effect.
The invention is based on the task of structuring a roller of the type indicated, in such a way that it can be included to a greater extent in the treatment process of the web, particularly the paper web.
This task is accomplished by means of a roller of the type corresponding to the preamble of Claim 1.
With regard to elastic resilience, it is possible to ensure that the conditions are similar to those for a roller provided with a plastic coating, for example of harder polyurethane, by means of a suitable selection of the soft metal. In the presentconnection, the term "soft metal" is intended to mean metals whose modulus of elasticity amounts to several times the modulus of elasticity of the usual plastic coatings, but which still possess sufficient resilience and elastic memory to be able to exercise the function of reducing pressure stress peaks in a substrate such as paper, when used as a roller coating, if this paper is being glazed bet~veen a roller coated with "soft metal" and a hard roller.
TRANSLATION
The decisive point of the soft metal coating, however, is that a roller with a metal coating is far superior to a roller with a plastic coating with regard to heat conductivity. 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 5 with a plastic coating, or a paper roller.
This property is particularly effective if the roller is heated from the inside and heat is to be transferred to the web surface through the coating. This works to a much greater extent in the case of a metal coating than in the case of a plastic or paper coating.
In accordance with Claim 2, possible soft metals are those with a melting point of more than 200 ~C and a lrnodulus of elasticity of less than 80,000 N/mm2, particularly less than 20,000 N/mm2 (Claim 3).
The 200 ~C limit is determined by the maximum surface temperatures of rollers for treating paper, plastics, and the like which occur at present. The upper limit 15 for the modulus of elasticity ensures that the elastic resilience is still present to a sufficient degree and is comparable in its function to a coating of plastic or paper.
Important exemplary embodiments for soft metals to be used according to the invention are those such as lead and/or m~gnesium and/or alllminllm (Claim 4). Lead has a melting point of 327 ~C and a modulus of elasticity of about 17,500 N/mm2,20 magnesium has a melting point of about 650 ~C and a modulus of elasticity of about 29,000 N/mm2, alllminnm has a melting point of approximately 660 ~C and a modulus of elasticity of about 77,000 N/mm2.
For an optimum adjustment of the mechanical properties of the coating, pure metal will not be used in most cases, but rather a suitable lead and/or magnesium 25 and/or alllminllm alloy will be used (Claim 5).
Possible lead alloys are, for example, materials such as hard lead, diecasting alloys with a lead base, and bearing metal with a lead base.
It is also possible to use an alloy which contains lead and/or magnesium, in which lead and/or magnesium and/or aluminum are not the base material, but rather TRANSLATION
, , CA 02229214 1998-02-10 only an additive to an alloy structured in some other way (Claim 6).
The thickness of the soft metal coating can correspond approximately to the thickness of a conventional plastic coating, and amount to 5 mm to 20 mrn (Claim 7), particularly 10 mm to 15 mm (Claim 8).
For producing the lead coating on the cylindrical roller body, all suitable known methods can be used. For example, in accordance with Claim 9, the coating can be applied to the roller body in the melted, fluid state, for example by way of lead dipping, or by means of processes similar to application welding, or by spraying.
In accordance with Claim 10, however, the coating can also be applied to the 10 roller body in the forrn of molded parts, which are soldered to the roller body and, if necessary, to each other.
One possibility, for example, is winding on strip-shaped extruded profile material made of the soft metal, in the manner of DE 25 45 146 Al, DE 27 22 023 Al, or DE 27 26 812 Al. However, rings which correspond to the diameter ofthe roller15 body can also be put on and soldered to the latter and to each other, at their faces.
Finally, it is also possible to bend plates in accordance with the circumference of the roller body and to affix them there.
The roller provided with the coating of soft metal is subsequently turned and buffed, so that it obtains a clean, sealed cylindrical surface.
To improve the elastic properties of the soft metal, the latter can be dispersion-hardened (Claim 11).
An ~ltern~tive possibility consists of using amorphously solidified soft metal, which is obtained by leaving a soft metal melt on a very cold counter-surface, for example a cooled drum, or spraying it on (VDI-Nachrichten (1985), Issue 22 datedMay 31, 1985, page 6). The undercooled metal layers, i.e. the flat metal layers which solidified before reaching a crystalline arrangement, can be joined together to form thicker units which result in the coating.
An important further development is the subject matter of Claim 13. The porous structure results in advantageous elastic resilience for the treatment purpose, TRANSLATION
because of the reduced bealing cross-section, in spite of the metallic material, i.e.
material with good heat conductivity. The existing forces are concentrated on the material framework present between the pores, and result in higher deformations there, in accordance with the higher stresses at a specific force.
The porous structure can be produced by means of a sintering process (Claim 14). A possible embodiment is ~interin~ together small hollow spheres of the soft metal at their outside circurnference (Claim 15), which makes it possible to lower the total modulus of elasticity of the coating below the value of the compact metal. In order to make this particularly effective, small hollow spheres with a relatively low 10 wall thickness according to Claim 16 are recommencle-l Alnmim-m is of particular significance for the small hollow spheres.
The porous structure can also be brought about by foaming up a metal melt (claim 17) (VDI-Nachric*ten (1995), No. 37 dated September 15, 1995, page 24), which results in a metal sponge.
However, a coating of a soft metal in the form of micro-honeycombs (Claim 18) is also included in the concept of the porous structure, these can be obtained by corresponding deformation of metal foils and are known from catalyst technology. It is practical if the micro-honeycombs, which have a hexagonal cross-section, for exarnple, stand radial to the roller with their axis.
In the porous material, the remS~ining cross-sections and therefore the heat conductivity are reduced as compared with a solid m~tf~ri~l In order to balance this out, it can be recommenclecl that the pores are at least partially filled with a heat-conductive material different from the m~teri~l ofthe coating (Claim 19).
In most instances, the rollers in question work at elevated temperatures in the 25 range of up to about 200 ~C. They cool down to ambient temperature during thebreaks in operation. In order not to have severe heat stresses occur in connection with these temperature differences, which could cause the coating to come loose from the cylindrical roller body over time, the development according to Claim 20 is recommen(le~l, where an alllmimlm material is suited as the carrier material for the TRANSLATION
possible soft metals (claim 21).
The webs exert a significant wear effect on the processing surface of the roller, particularly if they consist of paper and contain mineral components. The unprotected soft metal surface would not withstand this effect for long.
It is therefore recommen~led that the coating in turn have a thin coating of a wear-resistant material (Claim 22), e.g. hard materials (Claim 23).
Possible hard m~tPri~l~ are, for example, carbide m~t~ri~lc such as tnn~t~n carbide, chrome carbide, and ~il~iulll carbide, or oxide materials such as Al203, AlTiO3, liL~~ l oxide, chrome oxide, and the like. Processes are known to enable10 application of such coatings on substrates, in a thin layer, without using particularly high temperatures. Such coatings are used successfully, for example, for cuttingmaterials.
In the massive form, the m~teri~l~ mentioned are very brittle. In a thin layer, however, they are very elastic and are able to follow the deformations of the soft metal 15 nntlernP~th them without breaking or splintering. Since this elasticity depends on the thinne.~ of the layer and the accompanying freedom of the structure from defects, a thickness of the coating layer of less than 50 My is recommenclc~l, in accordance with Claim 24, in many cases even one of less than 10 My (Claim 25).
The point of dt;~al lu.~ of the invention and its significant case of application is 20 paper-gl~7ing The invention is also embodied in a gla7ing unit for treating paper, in accordance with Claim 26.
Here, the known "soft" roller with a plastic coating, as in DE 30 20 669 A1 and DE 32 01 635 C2, for example, is replaced with a roller with a coating of a soft metal, which allows significantly greater heat transport from the interior of the heated roller 25 to the back of the paper web which lies opposite the heated steel roller. In this way, a treatment effect is also brought about on this back of the paper web, and the "soft"
roller is included in the treatment function. In some cases, this will make it possible to avoid double arrangements of roller pairs to achieve a sufficient one-sided or double-sided effect, and to achieve sufficient gla_ing for some types of paper in only one roller TRANSLATION
. CA 02229214 1998-02-10 nip.
The tre~tment effect can be inten~ified if two rollers of the type according to the invention work against one heated steel roller (claim 27).
The drawing shows an exemplary embodiment of the invention.
Fig. 1 shows a detail of the border region of the roller, indicated in Fig. 2 with I, where the coating is cut open in a plane passing through the axis;
Fig. 2 shows a view of a roller pair, the top roller being structured according to Fig. 1.
The roller indicated as a whole with 10 in Fig. 1 comprises a cylindrical rollerbody 1. This roller body 1 can be a solid roller with or without internal channels for hc~ting However, roller body 1 can also be a hollow roller of a deflection-controlled roller, which is hydraulically supported from the inside and which can be heated from the inside by means of the hydraulic fluid which serves to support it, or by means of an additional heat carrier fluid.
Fig. 1 shows only a detail of a region of cylindrical roller body 1, close to the surface. In practice, roller body 1 can have a diameter from 500 to 1000 mm.
Roller body 1 carries a coating 2 with a uniform thickness over the entire surface, which is comprised, in the exemplary embodiment, of a lead alloy which is soldered at border surface 3 to the outer surface of cylindrical roller body 1, as indicated by heavier line 6. Soldering is only possible if coating 2 was previously present as a molded part. If coating 2 is applied in the melted, fluid state, 6 refers to the connection surface with cylindrical roller body 1.
In the exemplary embodiment shown, thickness 7 of coating 2, i.e. its radial çxr~n~e, is 12 mm.
On its outside circumference, coating 2 possesses a thin coating 4 of tlmp~ten carbide, outside 5 of which forms the processing surface of the roller and is intçn(le~l to reduce the wear effect on the soft lead alloy of coating 2. The thickness of coating 4 is shown in exaggerated manner in Fig. 1. In fact, it is only on the order of about 10 My.
Fig. 2 shows a case of use of roller 10, in the form of a two-roller glazing unit TRANSLATION
. CA 02229214 1998-02-10 .
100 with rollers 10 and 20, which together form a roller nip 8, through which a paper web 9 is passed.
Top roller 10 can be deflection-controlled and heated, and possesses a coating 2of a lead alloy with a wear-resistant coating 4, as shown in Fig. 1. Bottom roller 20 is 5 a roller which can be heated, with a polished circumference made of chilled cast iron.
While there was hardly any participation of the soft roller in the glazing process in the known roller pairs in glazing units, in which one roller had a coating made of plastic, because of its poor heat conductivity, coating 2, if it consists of a lead alloy, conducts the heat from the interior of heated roller 10 to the surface of the paper web 10 practically in the same manner as is the case for hard roller 20 with the steel surface.
In this way, the total amount of heat transferred to the paper web is significantly increased, on the one hand, and in particular, an effect on the back of paper web 9, which lies opposite roller 20, also takes place, resulting in increased smoothness there, also.
TRANSLATION
Claims (27)
1. A roller for treating webs of paper, cardboard, plastic, textiles and the like, with a cylindrical roller body (1) and a coating of an elastically resilient material applied to it, which forms the processing surface (5) of the roller, characterized in that the coating (2) consists of a soft metal.
2. The roller according to Claim 1, characterized in that the soft metal has a melting point of more than 200 °C and a modulus of elasticity of less than 80,000 N/mm2.
3. The roller according to Claim 2, characterized in that the soft metal has a modulus of elasticity of less than 20,000 N/mm2.
4. The roller according to one of Claims 1 to 3, characterized in that the coating (2) comprises lead and/or magnesium and/or aluminum.
5. The roller according to Claim 4, characterized in that the coating (2) consists of an alloy containing lead and/or magnesium and/or aluminum.
6. The roller according to Claim 4, characterized in that the coating (2) consists of an alloy which contains lead and/or magnesium and/or aluminum.
7. The roller according to one of Claims 1 to 6, characterized in that the coating (2) has a thickness of 5 to 20 mm.
8. The roller according to Claim 7, characterized in that the coating has a thickness of 10 mm to 15 mm.
9. The roller according to one of Claims 1 to 8, characterized in that the coating (2) is applied to the roller body (1) in the melted, fluid state.
10. The roller according to one of Claims 1 to 8, characterized in that the coating (2) is applied to the roller body (1) in the form of molded parts.
11. The roller according to one of Claims 1 to 10, characterized in that the coating (2) comprises a dispersion-hardened soft metal.
12. The roller according to one of Claims 1 to 11, characterized in that the coating (2) comprises a soft metal which is amorphously solidified.
13. The roller according to one of Claims 1 to 11, characterized in that the coating (2) has a soft metal with a porous structure.
14. The roller according to Claim 13, characterized in that the coating (2) comprises a sintered soft metal.
15. The roller according to Claim 14, characterized in that the coating (2) comprises small hollow spheres made of soft metal which are sintered together at their outside circumference.
16. The roller according to Claim 15, characterized in that the wall thickness of the small hollow spheres is at most 0.2 times their outside diameter.
17. The roller according to Claim 13, characterized in that the coating (2) comprises a metal sponge.
18. The roller according to Claim 13, characterized in that the coating (2) comprises a soft metal in the form of micro-honeycombs.
19. The roller according to one of Claims 13 to 18, characterized in that the pores are filled with a heat-conductive material.
20. The roller according to one of Claims 1 to 19, characterized in that the cylindrical roller body (1) consists, at least on its outside circumference, of a material with a thermal expansion coefficient similar to that of the coating 82) [sic].
21. The roller according to Claim 20, characterized in that the material is an aluminum material.
22. The roller according to one of Claims 1 to 21, characterized in that the coating (2) in turn has a thin coating (4) of a wear-resistant material.
23. The roller according to Claim 22, characterized in that the coating (4) consists of hard materials.
24. The roller according to Claim 22 or 23, characterized in that the thickness of the coating is less than 50 My.
25. The roller according to Claim 24, characterized in that the thickness of thecoating (4) is less than 10 My.
26. Glazing unit for treating paper, with two rollers (10, 20) which form a roller nip (8), one (20) of which can be heated and has a processing surface of the roller made of smooth steel, and the other of which is a roller (10) which can also be heated, in accordance with one of Claims 1 to 25.
27. Glazing unit for treating paper, with three rollers, the first of which can be heated and has a processing surface of the roller made of smooth steel, and the other two of which do not touch one another and are rollers which can also be heated, in accordance with one of Claims 1 to 25, each of which forms a roller nip with the first 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 |
| DE19529711.3 | 1995-08-11 | ||
| DE29607233.8 | 1996-04-22 | ||
| DE29607233U DE29607233U1 (en) | 1996-04-22 | 1996-04-22 | roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2229214A1 true CA2229214A1 (en) | 1997-02-27 |
Family
ID=26017645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002229214A Abandoned CA2229214A1 (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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6896647B1 (en) | 1999-06-02 | 2005-05-24 | Voith Sulzer Papiertechnik Patent Gmbh | Elastic roller and process for producing same |
| CN107923125A (en) * | 2015-07-02 | 2018-04-17 | 福伊特专利有限公司 | The method of the component for being used to prepare and/or handling the machine of web of fiber and the coating for manufacturing component |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19757474A1 (en) | 1997-12-23 | 1999-06-24 | Voith Sulzer Papiertech Patent | Paper calender |
| EP1166906A1 (en) * | 2000-06-23 | 2002-01-02 | Alcan International Limited | A work roll for and a method of producing metal foil |
| US6946031B2 (en) * | 2002-02-08 | 2005-09-20 | Fuji Photo Film Co., Ltd. | Rod for a coating device, and process for producing the same |
| EP1739231A1 (en) * | 2005-07-02 | 2007-01-03 | M-real Oyj | Cast coating device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI890953A (en) * | 1989-02-28 | 1990-08-29 | Valmet Paper Machinery Inc | VALS ELLER VALSBELAEGGNING I CELLULOSAMASKIN, PAPPERSMASKIN ELLER EFTERBEHANDLINGSMASKIN FOER PAPPER OCH FOERFARANDE FOER FRAMSTAELLNING AV DENNA SAMT ANVAENDNING AV DENNA. |
| 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 EP EP96919626A patent/EP0843758B1/en not_active Expired - Lifetime
- 1996-06-04 JP JP9508799A patent/JPH11509279A/en active Pending
- 1996-06-04 WO PCT/DE1996/000976 patent/WO1997007281A1/en active IP Right Grant
- 1996-06-04 DE DE59604698T patent/DE59604698D1/en not_active Expired - Fee Related
- 1996-06-04 CA CA002229214A patent/CA2229214A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6896647B1 (en) | 1999-06-02 | 2005-05-24 | Voith Sulzer Papiertechnik Patent Gmbh | Elastic roller and process for producing same |
| CN107923125A (en) * | 2015-07-02 | 2018-04-17 | 福伊特专利有限公司 | The method of the component for being used to prepare and/or handling the machine of web of fiber and the coating for manufacturing component |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0843758B1 (en) | 2000-03-15 |
| JPH11509279A (en) | 1999-08-17 |
| WO1997007281A1 (en) | 1997-02-27 |
| DE59604698D1 (en) | 2000-04-20 |
| EP0843758A1 (en) | 1998-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2097724C (en) | Method and apparatus for calendering paper with internally heated roll | |
| KR100532883B1 (en) | Rolls for paper machine or paperboard, production method of rolls, coating composition for rolls | |
| CA2229214A1 (en) | Roller | |
| JPH08246380A (en) | Calendar for paper sheet | |
| WO2007082994A1 (en) | Method for manufacturing a metal belt for use in a paper/board machine or in a finishing machine | |
| US5215765A (en) | Iron sponge briquetting press | |
| FR2997966B1 (en) | CAST-STEEL ARTICLE INCLUDING A VITREOUS COATING AND PROCESS FOR MANUFACTURING SUCH AN ARTICLE | |
| CN110747465B (en) | Laser manufacturing method of hearth roll of hot-rolling annealing furnace | |
| US7422659B2 (en) | Method and apparatus for treating a web of paper or board | |
| JP4418749B2 (en) | Side face of a plant used for twin-roll continuous casting of metal strips | |
| CA2267030C (en) | Calender, in particular for treatment of a paper web | |
| US7108047B2 (en) | Method for operating a strip casting machine and jacket ring for a casting roll used to carry out said method | |
| CA2002929C (en) | Arrangement in a paper machine | |
| US20100018459A1 (en) | Immersion bath roll and a method for the manufacture of an immersion bath roll | |
| MXPA02002348A (en) | Casting roller. | |
| CN1173403A (en) | Sleeving regeneration tech. for cold-rolling working roller | |
| JPH0510417A (en) | Machine part item connecting structure | |
| BR102019001318A2 (en) | GRINDING EQUIPMENT ROLLER SET | |
| JPH09295106A (en) | Method for continuously casting thin cast slab | |
| JPH0494843A (en) | Twin roll type continuous casting method | |
| JPH05185188A (en) | Twin roll device for thin metallic strip | |
| JPH044955A (en) | Twin roll type strip continuous caster and casting method thereof | |
| Schrama | Roll neck materials--selection criteria and repair techniques | |
| SU1542768A1 (en) | Method of repairing rolling mill rolls | |
| JPH01192449A (en) | Device for continuously casting metal strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |