CA2069046A1 - Composition of matter for covering a roll - Google Patents
Composition of matter for covering a rollInfo
- Publication number
- CA2069046A1 CA2069046A1 CA 2069046 CA2069046A CA2069046A1 CA 2069046 A1 CA2069046 A1 CA 2069046A1 CA 2069046 CA2069046 CA 2069046 CA 2069046 A CA2069046 A CA 2069046A CA 2069046 A1 CA2069046 A1 CA 2069046A1
- Authority
- CA
- Canada
- Prior art keywords
- composition
- roll
- roll surface
- particles
- set forth
- 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
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A composition of matter is disclosed for covering a roll of a papermachine. The composition defines a roll surface which physically contacts a web extending through the papermachine. The composition includes an elastomeric material and a plurality of hollow particles randomly dispersed within the material. The arrangement is such that a percentage of the particles are exposed to the roll surface. When the roll surface is machined, the percentage of particles are ruptured so that the roll surface is porous and so that sticking of the web to the roll surface is controlled.
A composition of matter is disclosed for covering a roll of a papermachine. The composition defines a roll surface which physically contacts a web extending through the papermachine. The composition includes an elastomeric material and a plurality of hollow particles randomly dispersed within the material. The arrangement is such that a percentage of the particles are exposed to the roll surface. When the roll surface is machined, the percentage of particles are ruptured so that the roll surface is porous and so that sticking of the web to the roll surface is controlled.
Description
21~69~6 PATENT APPL I CATI ON
TI~ A COMPOSIT:LON OF MATTER FOR COV13RING A ROLL
BACKGROUND OF THE INV~lTIt:lN
FIELD OF~ INV~TION
The present invention relates to a- composition of matter for covering a roll of a papermachine. More particularly, the composition defines a roll surface which physically contacts a web extending through the papermachine.
INFORMP~TION DISCLOSUR~ STAl~
In the papermaking art, a web of paper is formed by ejecting stock onto a moving screen so that water within the stock is drained therefrom.
The formed web is then transferred by means of a press felt between a pair of counter-rotating press rolls forming part of a pressing section.
Typically, one of the press rolls is a granite roll because granite not only provides the required degree of hardness for pressing water from a formed web but also such granite roll has unique web release characterlstics.
FB34433]570US
TI~ A COMPOSIT:LON OF MATTER FOR COV13RING A ROLL
BACKGROUND OF THE INV~lTIt:lN
FIELD OF~ INV~TION
The present invention relates to a- composition of matter for covering a roll of a papermachine. More particularly, the composition defines a roll surface which physically contacts a web extending through the papermachine.
INFORMP~TION DISCLOSUR~ STAl~
In the papermaking art, a web of paper is formed by ejecting stock onto a moving screen so that water within the stock is drained therefrom.
The formed web is then transferred by means of a press felt between a pair of counter-rotating press rolls forming part of a pressing section.
Typically, one of the press rolls is a granite roll because granite not only provides the required degree of hardness for pressing water from a formed web but also such granite roll has unique web release characterlstics.
FB34433]570US
2~9~
Although much research has been carried out in an attempt to explain the unique surface release characteristics of natural granite, essentially, it is understood that the inherent surface porosity of a granite roll accounts for the ready adhesion of the wet web to the granite surface and the subsequent release of the web therefrom downstream relative to the pressing nip de~ined between the aforementioned counter-rotating press rolls.
Nevertheless, the use of natural granite in a pres~
roll presents several serious problems.
First, a typical granite press roll has a diameter of foot and a cross-machine directional width of 30 feet.
Accordingly, such press roll will weigh in the region of 100 tons.
With the ever increasing speeds at which press sections are operated, there exists a potential hazard in that if the aforementioned natural granite press roll breaks apart,`
considerable damage can be caused thereby.
Dependent on the grade of paper or board being manufactured, it is not uncommon to have press rolls rotating at approximately 3,500 feet per minute and machine speeds in the region of 6,000 feet per minute are envisaged.
Because of the aforementioned hazard and the actual occurrence of accidents at paper mills caused by faulty , FB 3 ~ ~ 3 3 1 5 7 0 US
2~6~0~6 granite rolls, legislation in certain European eountries has outlawed the use of conventional granite press rolls.
Second, the supply of natural granite suitable for the production of press rolls is being depleted and the supply of relatively massive bloeks of natural granite for sueh roll production is decreasing.
Accordingly, the present invention provides a relatively low cost granite substitute ~or applieation to a roll shell, thereby overeoming the aforementioned problems associated with the use-of natural granite.
Therefore, it is a primary objeetive of the present invention to provide a eomposition of matter for eovering a roll of a papermaehine and for partieularly providing a substitute for a natural granite roll in a press section, such composition overeoming the inade~uaeies of the prior art natural granite rolls and making a considerable contribution to the art of pressing a formed web.
Another object of the present invention is the provision of a composition eovering a roll ineluding an elastomeric material and a plurality o~ hollow partieles randomly dispersed within the material so that during maehining of the roll surface, some of the partieles are sheared or ruptured so that the roll surfaee is porous and so that sticking of the web to the roll surface is inhibited.
.;, . : . . : .
E'B3'1~331~70US
20S90~6 Another object of the present invention is the provision of a composition for covering a roll of a papermachine, the composition including an epoxy resin with hollow spherical glass particles randomly dispersed therein so that when the hollow spheres are sheared, the roll surface is porous and sticking of the web to the roll surface is controlled.
Another object of the present invention is the provision of a composition in which the porosity of the roll surface is varied according to the diameter of the hollow particles.
Another object of the present invention is the provision of a composition in which the porosity of the roll surface is varied according to the thickness of the walls of the hollow particles.
Another object of the present invention is the provision of a composition in which a plurality of solid particles are also randomly dispersed within the elastomeric material, the porosity of the roll surface being varied according to the ratio of the percentage of the hollow particles to the percentage of solid particles.
Other objects and advantages of the present invention will be readily apparent to those skilled in the art by a ,:
Fs3~4331570Us 20~904~3 consideration of the detailed description taken in conjunction with the annexed drawings.
SUMMARY OF TH~ :[NVENTION
The present invention relates to a composition of matter and a roll cover for covering a roll of a papermachine. The composition defines a roll surface which physically contacts a web extending through the papermachine. The composition insludes an elastomeric material and a plurality of hollow particles randomly dispersed within the material. The arrangement is such that a percentage of the particles are exposed to the roll surface. When the roll surface is machined, the percentage of particles are sheared so that the roll surface is porous and so that sticking of the web to the roll sur~ace is controlled.
In a more specific embodiment of the present invention, the elastomeric material is a polymeric material which may be a polymeric resin.
In another embodiment of the present invention, the polymeric material is an epoxy resin.
More specifically, each of the hollow particles is spherical, and the particles are of either glass or graphite.
, E'B3'14331570US
206904 ~
The porosity of the roll surface is varied according to the diameter of the hollow particles.
In another embodiment of the present invention, the porosity of the roll surface is varied according to the thickness of the walls of the hollow particles.
In yet another embodiment of the present invention, the composition further includes a plurality of solid particles randomly dispersed within the elastomeric material. The arrangement is such that the porosity of the roll surface is varied according to the ratio of the percentage of hollow particles to the percentage of solid particles.
.
The present invention is particularly applicable to the provision of a roll cover on a tubular metal shell for providing a substitute granite press roll.
Although many modifications and variations to the present invention will be apparent to those skilled in the art by a consideration of the detailed description contained hereinafter taken in conjunction with the annexed drawings, such modifications and variations fall within the spirit and scope of the present invention as defined by the appended claims.
Included in such modifications would be the provision of glass spheres having a diameter within the range 1 to 100 microns.
.
- .
. ~ . ~: . . . ~i .
.
, : ` . ~' ::
' ' , ~ ' ~' :. , ~; : .
FB3443~1570US
2~6~
Additionally, the solid particles could be of quartz rock or feldspar or milled g~aphite fibers or solid glass spheres or glass fibers.
Also, the hollow spheres could be of graphite or glass coated with metal. The metal coating would provide a path of conductivity in view of some of the coated spheres touching each other. The aforementioned path of conductivity would conduct electricity away from the surface of the roll, thereby avoiding scorching of the paper web that has been a problem in the prior art rolls.
Additionally, the hollow spheres could be fabricated from ceramic and have a diameter of approximately 1 100 microns.
In practice, the spheres and solid particles are poured into a vat of the polymeric material and are mixed therewith by means of a paddle or the like.
The spheres disposed adjacent to the surface are exposed by treating such surface with a lathe or grinder or by sanding.
Even the doctor blade associated with the press roll in use thereof continually renews the porous surface of the roll by progressively exposing hollow spheres during the gradual wear of the surface of the substitute granite roll.
, .. ~ . .. . ..
' ': . ~ ' . 1 .
. FB344331570US
2~69~
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross-sectional view of a typical prior art natural granite press roll;
Figure 2 is a side-elevational view of a substitute for a natural granite roll showing a tubular shell with a composition applied thereto, according to the present invention, for covering the roll;
Figure 3 is an enlarged fragmentary view of a portion of the shell and the composition covering the shell shown in Figure 2;
Figure 4 is a further enlargement of the composition shown in Figure 3;
Figure 5 is a similar view to that shown in Figure 4 but shows a further embodiment of the present invention in which the thickness of the walls of the-hollow particles varies; and Figure 6 is a similar view to that shown in Figure 4 but shows both hollow and solid spherical particles.
Similar reference characters refer to similar parts throughout the various views of the drawings.
-' ' ~ ':
:
. : .
, ,. ~: ' . ~'` ~, . :
... ~ ~ .
' ~06'9~6 D~TAILED DESCRIPTION OF TME DRAWINGS
Figure 1 is a side-elevational view of a typical prior art natural granite press roll generally designated 10. The press roll 10 includes a rotatable bearing axle 12 and a relatively massive cylindrical granite sleeve 14. The sleeve 14 defines a roll surface 16 which physically contacts a web W extending through the papermachine.
Figure 2 is a side-elevational view showing a composition of matter, generally designated 18, for covering a press roll, generally designated 10A of a papermachine according to the present invention. The composition 18 defines a roll surface 16A which physically contacts a web WA extending through the papermachine.
Figure 3 is an enlarged fragmentary sectional view of the composition 18. The composition 18 includes an elastomeric material 20 and a plurality of hollow particles 22,23,24 randomly dispersed within the material 20 such that a percentage of the particles 22-24 are exposed to the roll surface 16A. The arrangement is such that when the roll surface 16A is machined, the percentage of particles 22-24 are sheared or ruptured so that the roll surface 16A is porous and so that sticking of the web WA to the roll surface 16A is controlled.
. . ~ ~ , ' ~ ., FB344~31570US
~06gO~6 The composition shown in Figure 3 is a polymeric material. More specifically, the polymeric material 20 is a polymeric resin.
In a preferred embodiment of the present invention, the polymeric material is an epoxy resin.
As shown in Figure 3, the roll lOA includes a steel shell 21. Also in Figure 3, the hollow spheres 22-24 are spherical in shape and are of glass or graphite~
More specifically, as shown in Figure 3, the steel shell 21 is wound with 13 to 14 layers of woven fiberglass Typically, the woven fiberglass is in the form of a 4-6 inch wide tape which is spirally wound onto the shell 21. The woven tape attains a thickness within the range .2 to .3 inches, and is saturated with the epoxy resin. In Figure 3, the woven tape is indicated by the number 27.
Additionally, a non-woven fiberglass or KEVLAR layer 29 is applied over the woven fiberglass tape 27. The non woven layer 29 may be approximately .3 inches in thickness. The layer 29 is saturated with the hollow spheres 22-24.
Figure 4 is a further enlargement of the composition shown in Figure 3.
~ .. ... .
FB34~331570US
2~0~6 As shown in Figure 4, the porosity oE the roll surface 16A is var.ied according to the diameter D of the hollow particles 23.
Figure 5 is a sectional view similar to that shown in Figure 4 but shows an alternative embodiment of the present invention in which the porosity of the roll surface 16B is varied according to the thickness T of the walls of the hollow particles 23B and 24B.
Additionally, the porosity can be changed by varying both the diameter D and the thickness T or by having spheres having different diameters and/or wall thicknesses relative to each other.
In yet a further embodiment of the present invention, as shown in Figure 6, a plurality of solid glass spheres 25, 26 are randomly dispersed within the elastomeric material 20C. The porosity of the roll surface 16C is varied according to the ratio of the percentage of hollow particles' 23C to the percentage of solid spheres 25.
Although solid spheres 25 are shown in Figure 6, it will be appreciated by those skilled in the art that any solid particles could be used.
The present invention is particularly applicable to the manufacture of a substitute for a natural granite press roll.
.
. . FB344331570US
2~69~4~
The substitute press roll, according to the present invention, is manufactured by applying a mixture of epoxy resin with hollow gl.ass spheres randomly dispersed therein.
The covering composition is applied to the roll shell 21 by tape winding or casting the epox~ resin and glass spheres onto the steel shell 21 of the substitute press roll.
The present invention provides a relative low-cost substitute for a natural granite press roll and overcomes the problam of the hazards associated with the use of the prior art natural granite press rolls and also overcomes the problem caused by the scarcity of sources of natural granite.
.
,,. ; ~ -. 1- : . :.
: ~ ' ` . `
Although much research has been carried out in an attempt to explain the unique surface release characteristics of natural granite, essentially, it is understood that the inherent surface porosity of a granite roll accounts for the ready adhesion of the wet web to the granite surface and the subsequent release of the web therefrom downstream relative to the pressing nip de~ined between the aforementioned counter-rotating press rolls.
Nevertheless, the use of natural granite in a pres~
roll presents several serious problems.
First, a typical granite press roll has a diameter of foot and a cross-machine directional width of 30 feet.
Accordingly, such press roll will weigh in the region of 100 tons.
With the ever increasing speeds at which press sections are operated, there exists a potential hazard in that if the aforementioned natural granite press roll breaks apart,`
considerable damage can be caused thereby.
Dependent on the grade of paper or board being manufactured, it is not uncommon to have press rolls rotating at approximately 3,500 feet per minute and machine speeds in the region of 6,000 feet per minute are envisaged.
Because of the aforementioned hazard and the actual occurrence of accidents at paper mills caused by faulty , FB 3 ~ ~ 3 3 1 5 7 0 US
2~6~0~6 granite rolls, legislation in certain European eountries has outlawed the use of conventional granite press rolls.
Second, the supply of natural granite suitable for the production of press rolls is being depleted and the supply of relatively massive bloeks of natural granite for sueh roll production is decreasing.
Accordingly, the present invention provides a relatively low cost granite substitute ~or applieation to a roll shell, thereby overeoming the aforementioned problems associated with the use-of natural granite.
Therefore, it is a primary objeetive of the present invention to provide a eomposition of matter for eovering a roll of a papermaehine and for partieularly providing a substitute for a natural granite roll in a press section, such composition overeoming the inade~uaeies of the prior art natural granite rolls and making a considerable contribution to the art of pressing a formed web.
Another object of the present invention is the provision of a composition eovering a roll ineluding an elastomeric material and a plurality o~ hollow partieles randomly dispersed within the material so that during maehining of the roll surface, some of the partieles are sheared or ruptured so that the roll surfaee is porous and so that sticking of the web to the roll surface is inhibited.
.;, . : . . : .
E'B3'1~331~70US
20S90~6 Another object of the present invention is the provision of a composition for covering a roll of a papermachine, the composition including an epoxy resin with hollow spherical glass particles randomly dispersed therein so that when the hollow spheres are sheared, the roll surface is porous and sticking of the web to the roll surface is controlled.
Another object of the present invention is the provision of a composition in which the porosity of the roll surface is varied according to the diameter of the hollow particles.
Another object of the present invention is the provision of a composition in which the porosity of the roll surface is varied according to the thickness of the walls of the hollow particles.
Another object of the present invention is the provision of a composition in which a plurality of solid particles are also randomly dispersed within the elastomeric material, the porosity of the roll surface being varied according to the ratio of the percentage of the hollow particles to the percentage of solid particles.
Other objects and advantages of the present invention will be readily apparent to those skilled in the art by a ,:
Fs3~4331570Us 20~904~3 consideration of the detailed description taken in conjunction with the annexed drawings.
SUMMARY OF TH~ :[NVENTION
The present invention relates to a composition of matter and a roll cover for covering a roll of a papermachine. The composition defines a roll surface which physically contacts a web extending through the papermachine. The composition insludes an elastomeric material and a plurality of hollow particles randomly dispersed within the material. The arrangement is such that a percentage of the particles are exposed to the roll surface. When the roll surface is machined, the percentage of particles are sheared so that the roll surface is porous and so that sticking of the web to the roll sur~ace is controlled.
In a more specific embodiment of the present invention, the elastomeric material is a polymeric material which may be a polymeric resin.
In another embodiment of the present invention, the polymeric material is an epoxy resin.
More specifically, each of the hollow particles is spherical, and the particles are of either glass or graphite.
, E'B3'14331570US
206904 ~
The porosity of the roll surface is varied according to the diameter of the hollow particles.
In another embodiment of the present invention, the porosity of the roll surface is varied according to the thickness of the walls of the hollow particles.
In yet another embodiment of the present invention, the composition further includes a plurality of solid particles randomly dispersed within the elastomeric material. The arrangement is such that the porosity of the roll surface is varied according to the ratio of the percentage of hollow particles to the percentage of solid particles.
.
The present invention is particularly applicable to the provision of a roll cover on a tubular metal shell for providing a substitute granite press roll.
Although many modifications and variations to the present invention will be apparent to those skilled in the art by a consideration of the detailed description contained hereinafter taken in conjunction with the annexed drawings, such modifications and variations fall within the spirit and scope of the present invention as defined by the appended claims.
Included in such modifications would be the provision of glass spheres having a diameter within the range 1 to 100 microns.
.
- .
. ~ . ~: . . . ~i .
.
, : ` . ~' ::
' ' , ~ ' ~' :. , ~; : .
FB3443~1570US
2~6~
Additionally, the solid particles could be of quartz rock or feldspar or milled g~aphite fibers or solid glass spheres or glass fibers.
Also, the hollow spheres could be of graphite or glass coated with metal. The metal coating would provide a path of conductivity in view of some of the coated spheres touching each other. The aforementioned path of conductivity would conduct electricity away from the surface of the roll, thereby avoiding scorching of the paper web that has been a problem in the prior art rolls.
Additionally, the hollow spheres could be fabricated from ceramic and have a diameter of approximately 1 100 microns.
In practice, the spheres and solid particles are poured into a vat of the polymeric material and are mixed therewith by means of a paddle or the like.
The spheres disposed adjacent to the surface are exposed by treating such surface with a lathe or grinder or by sanding.
Even the doctor blade associated with the press roll in use thereof continually renews the porous surface of the roll by progressively exposing hollow spheres during the gradual wear of the surface of the substitute granite roll.
, .. ~ . .. . ..
' ': . ~ ' . 1 .
. FB344331570US
2~69~
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross-sectional view of a typical prior art natural granite press roll;
Figure 2 is a side-elevational view of a substitute for a natural granite roll showing a tubular shell with a composition applied thereto, according to the present invention, for covering the roll;
Figure 3 is an enlarged fragmentary view of a portion of the shell and the composition covering the shell shown in Figure 2;
Figure 4 is a further enlargement of the composition shown in Figure 3;
Figure 5 is a similar view to that shown in Figure 4 but shows a further embodiment of the present invention in which the thickness of the walls of the-hollow particles varies; and Figure 6 is a similar view to that shown in Figure 4 but shows both hollow and solid spherical particles.
Similar reference characters refer to similar parts throughout the various views of the drawings.
-' ' ~ ':
:
. : .
, ,. ~: ' . ~'` ~, . :
... ~ ~ .
' ~06'9~6 D~TAILED DESCRIPTION OF TME DRAWINGS
Figure 1 is a side-elevational view of a typical prior art natural granite press roll generally designated 10. The press roll 10 includes a rotatable bearing axle 12 and a relatively massive cylindrical granite sleeve 14. The sleeve 14 defines a roll surface 16 which physically contacts a web W extending through the papermachine.
Figure 2 is a side-elevational view showing a composition of matter, generally designated 18, for covering a press roll, generally designated 10A of a papermachine according to the present invention. The composition 18 defines a roll surface 16A which physically contacts a web WA extending through the papermachine.
Figure 3 is an enlarged fragmentary sectional view of the composition 18. The composition 18 includes an elastomeric material 20 and a plurality of hollow particles 22,23,24 randomly dispersed within the material 20 such that a percentage of the particles 22-24 are exposed to the roll surface 16A. The arrangement is such that when the roll surface 16A is machined, the percentage of particles 22-24 are sheared or ruptured so that the roll surface 16A is porous and so that sticking of the web WA to the roll surface 16A is controlled.
. . ~ ~ , ' ~ ., FB344~31570US
~06gO~6 The composition shown in Figure 3 is a polymeric material. More specifically, the polymeric material 20 is a polymeric resin.
In a preferred embodiment of the present invention, the polymeric material is an epoxy resin.
As shown in Figure 3, the roll lOA includes a steel shell 21. Also in Figure 3, the hollow spheres 22-24 are spherical in shape and are of glass or graphite~
More specifically, as shown in Figure 3, the steel shell 21 is wound with 13 to 14 layers of woven fiberglass Typically, the woven fiberglass is in the form of a 4-6 inch wide tape which is spirally wound onto the shell 21. The woven tape attains a thickness within the range .2 to .3 inches, and is saturated with the epoxy resin. In Figure 3, the woven tape is indicated by the number 27.
Additionally, a non-woven fiberglass or KEVLAR layer 29 is applied over the woven fiberglass tape 27. The non woven layer 29 may be approximately .3 inches in thickness. The layer 29 is saturated with the hollow spheres 22-24.
Figure 4 is a further enlargement of the composition shown in Figure 3.
~ .. ... .
FB34~331570US
2~0~6 As shown in Figure 4, the porosity oE the roll surface 16A is var.ied according to the diameter D of the hollow particles 23.
Figure 5 is a sectional view similar to that shown in Figure 4 but shows an alternative embodiment of the present invention in which the porosity of the roll surface 16B is varied according to the thickness T of the walls of the hollow particles 23B and 24B.
Additionally, the porosity can be changed by varying both the diameter D and the thickness T or by having spheres having different diameters and/or wall thicknesses relative to each other.
In yet a further embodiment of the present invention, as shown in Figure 6, a plurality of solid glass spheres 25, 26 are randomly dispersed within the elastomeric material 20C. The porosity of the roll surface 16C is varied according to the ratio of the percentage of hollow particles' 23C to the percentage of solid spheres 25.
Although solid spheres 25 are shown in Figure 6, it will be appreciated by those skilled in the art that any solid particles could be used.
The present invention is particularly applicable to the manufacture of a substitute for a natural granite press roll.
.
. . FB344331570US
2~69~4~
The substitute press roll, according to the present invention, is manufactured by applying a mixture of epoxy resin with hollow gl.ass spheres randomly dispersed therein.
The covering composition is applied to the roll shell 21 by tape winding or casting the epox~ resin and glass spheres onto the steel shell 21 of the substitute press roll.
The present invention provides a relative low-cost substitute for a natural granite press roll and overcomes the problam of the hazards associated with the use of the prior art natural granite press rolls and also overcomes the problem caused by the scarcity of sources of natural granite.
.
,,. ; ~ -. 1- : . :.
: ~ ' ` . `
Claims (13)
1. A composition of matter for covering a roll of a papermachine, said composition defining a roll surface which physically contacts a web extending through said papermachine, said composition comprising:
an elastomeric material; and a plurality of hollow particles randomly dispersed within said material such that a percentage of said particles are exposed to the roll surface, the arrangement being such that when the roll surface is worn down, said percentage of particles are ruptured so that the roll surface is porous and so that sticking of the web to the roll surface is controlled.
an elastomeric material; and a plurality of hollow particles randomly dispersed within said material such that a percentage of said particles are exposed to the roll surface, the arrangement being such that when the roll surface is worn down, said percentage of particles are ruptured so that the roll surface is porous and so that sticking of the web to the roll surface is controlled.
2. A composition as set forth in claim 1 wherein said elastomeric material is:
a polymeric material.
a polymeric material.
3. A composition as set forth in claim 2 wherein said polymeric material is a polymeric resin.
4. A composition as set forth in claim 2 wherein said polymeric material is an epoxy resin.
5. A composition as set forth in claim 1 wherein each of said hollow particles is spherical.
6. A composition as set forth in claim 5 wherein said hollow particles are of glass.
7. A composition as set forth in claim 5 wherein said hollow particles are of graphite.
8. A composition as set forth in claim 5 wherein the porosity of the roll surface is varied according to the diameter of said hollow particles.
9. A composition as set forth in claim 5 wherein the porosity of the roll surface is varied according to the thickness of the walls of said hollow particles.
10. A composition as set forth in claim 5 wherein the porosity of the roll surface is varied according to both the diameter of said hollow particles and the wall thickness thereof.
11. A composition as set forth in claim 1 further including:
a plurality of solid particles randomly dispersed within said elastomeric material, the porosity of the roll surface being varied according to the ratio of the percentage of hollow particles to the percentage of solid particles.
a plurality of solid particles randomly dispersed within said elastomeric material, the porosity of the roll surface being varied according to the ratio of the percentage of hollow particles to the percentage of solid particles.
12. A composition as set forth in claim 11 wherein said hollow particles have various diameters relative to each other, and said solid particles also have various sizes relative to each other so that the porosity of the roll surface is varied.
13. A roll cover for covering a roll of a papermachine, said roll cover comprising:
an elastomeric material; and a plurality of hollow particles randomly dispersed within said material such that a percentage of said particles are exposed to the roll surface, the arrangement being such that when the roll surface is machined, said percentage of particles are ruptured so that the roll surface is porous and so that sticking of the web to the roll surface is controlled, said elastomeric material and said randomly dispersed hollow particles being tape wound onto the roll for providing a substitute granite roll.
an elastomeric material; and a plurality of hollow particles randomly dispersed within said material such that a percentage of said particles are exposed to the roll surface, the arrangement being such that when the roll surface is machined, said percentage of particles are ruptured so that the roll surface is porous and so that sticking of the web to the roll surface is controlled, said elastomeric material and said randomly dispersed hollow particles being tape wound onto the roll for providing a substitute granite roll.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71795591A | 1991-06-20 | 1991-06-20 | |
| US717,955 | 1991-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2069046A1 true CA2069046A1 (en) | 1992-12-21 |
Family
ID=24884205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2069046 Abandoned CA2069046A1 (en) | 1991-06-20 | 1992-05-20 | Composition of matter for covering a roll |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH07122231B2 (en) |
| CA (1) | CA2069046A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6983540B2 (en) | 2000-09-05 | 2006-01-10 | Yamauchi Corporation | Method for manufacturing elastic cylindrical body and method for manufacturing elastic roll |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485293A (en) * | 1993-09-29 | 1996-01-16 | Honeywell Inc. | Liquid crystal display including color triads with split pixels |
| DE112007000151B4 (en) * | 2006-07-14 | 2015-09-24 | Bando Chemical Industries, Ltd. | Friction drive belt and method of making same |
-
1992
- 1992-05-20 CA CA 2069046 patent/CA2069046A1/en not_active Abandoned
- 1992-06-11 JP JP15163292A patent/JPH07122231B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6983540B2 (en) | 2000-09-05 | 2006-01-10 | Yamauchi Corporation | Method for manufacturing elastic cylindrical body and method for manufacturing elastic roll |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05171588A (en) | 1993-07-09 |
| JPH07122231B2 (en) | 1995-12-25 |
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