CA1282270C - Papermaking belt with smooth inner surface and method of making same - Google Patents
Papermaking belt with smooth inner surface and method of making sameInfo
- Publication number
- CA1282270C CA1282270C CA000499552A CA499552A CA1282270C CA 1282270 C CA1282270 C CA 1282270C CA 000499552 A CA000499552 A CA 000499552A CA 499552 A CA499552 A CA 499552A CA 1282270 C CA1282270 C CA 1282270C
- Authority
- CA
- Canada
- Prior art keywords
- endless
- mold
- mandrel
- base fabric
- belt
- 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.)
- Expired - Fee Related
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
- D21F3/0236—Belts or sleeves therefor manufacturing methods
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Belt Conveyors (AREA)
- Making Paper Articles (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A belt is disclosed having a base fabric which has been impregnated by or immersed into a polymer material so that it has a smooth inner surface. The belt is used to form an extended press nip for dewatering a paper web. The press nip is formed by forcing a stationary shoe against the inner surface of the belt.
The belt is preferably made by mounting a base fabric on the inner mandrel of a cylindrical mold and injecting an appropriate material in the mold. After the material is properly dispersed through the base fabric, it is cured.
A belt is disclosed having a base fabric which has been impregnated by or immersed into a polymer material so that it has a smooth inner surface. The belt is used to form an extended press nip for dewatering a paper web. The press nip is formed by forcing a stationary shoe against the inner surface of the belt.
The belt is preferably made by mounting a base fabric on the inner mandrel of a cylindrical mold and injecting an appropriate material in the mold. After the material is properly dispersed through the base fabric, it is cured.
Description
~8~270 BACKGROUND OF THE INVENTION
1. Field of Invention The field of the invention relates to impermeable belts with smooth inner surfaces and more particularly to a belt used in an extended press nip for dewatering a fibrous web formed in a papermaking machine.
1. Field of Invention The field of the invention relates to impermeable belts with smooth inner surfaces and more particularly to a belt used in an extended press nip for dewatering a fibrous web formed in a papermaking machine.
2. Description of the Prior Art During the papermaking process, a web is formed by depositing a fibrous slurry on a forming wire. A large amount of water is drained from the slurry during this pro-cess, after which the newly-formed web proceeds to a press section. The press section includes a series of press nips.
The web finally proceeds to a drying section including heated dryer drums where the water content is reduced to a desirable level.
In view of the high cost of energy, it is desirable to remove as much water as possible from the web prior to its entering the drying section. The dryer drums in this section are often heated by steam and costs can be substantial if a large amount of water needs to be removed.
The use of extended press nips has been found to be advantageous over the use of nips formed by pairs of adjacent rollers. By extending the time the web is subjected to pressure in the nip, a greater amount of water can be removed. This fact has been recognized by those skilled in the art, and several patents have been granted in the area.
These U.S. patents include Re. 30,268 (May 6, 1980, Edgar J.
Justus), 4,201,624 tMay 6, 1980, William C. Mohr et al), 4,229,253 (October 21, 1980, Dennis C. Cronin) and 4,229,254 (October 21, 1980, Michael L. Gill).
~`
,~ -1-1~8ZZ70 1 In using extended press nips to dewater a fibrous web, the web has typically been sandwiched between two moisture absorbing felts and a belt. The felts are trained around a cylindrical press roll with the web between them while the S belt is arranged for applying pressure to the felts and roll. A pressure shoe exerts pressure on the belt in the press area.
The belt is provided with a very smooth surface for contacting the shoe so that it can transfer pressure to the felts and the fibrous webs without overheating or wearing away. Furthermore the belt must be impermeable to oil used to lubricate its passage over the shoe which could conta-minate the felts and the web. Heretofore the belt was made by applying a polymer coating to the outer surface of an endless fabric. Since the belt is arranged so that its inner surface is the shoe-contacting surface, the endless coated fabric i5 then reversed (i.e. turned inside out).
While this procedure was satisfactory for belts having a length of 24 feet or more, it has been found that it is difficult to reverse belts having a length of less than 24 feet. Furthermore it was found that it was difficult to, apply the coating to the outer surface of shorter belts.
OBJECTIVES AND SUMMARY OF T~E INVENTION
An objective of the present invention is to provide a relatively short belt with a smooth inner surface, adapted to be used in an extended press nip.
Another objective is to provide a belt which is impermeable to oil.
A further objective is to provide a method of producing the above-mentioned belt.
; -2-827~'70 Other objectives and advantages shall become apparent from the following description of the invention. According to this invention a belt is constructed of an endless base fabric embedded in a polymeric substance formed with a smooth, frictionless inner surface. The belt is made by providing a mandrel with a smooth outer surface, placing the endless base fabric on said mandrel covering with an outer shell, and then impregnating the base fabric with a polymer.
As the polymer solidifies the outer surface of the mandrel forms a smooth inner polymer surface.
Therefore, a construction in accordance with the present invention comprises an endless papermaking belt for use in a papermaking extended nip press which includes an endless base fabric of open construction, an impregnating material penetrating the base fabric to form a smooth inner surface thereon. The base fabric is completely contained within the impregnating material.
Also, in accordance with the present invention, there is provided a method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press. The method comprises the steps of providing an endless base fabric of open construction, providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell, and disposing the endless base fabric within the mold on the mandrel. The method also comprises the steps of maintaining the cylindrical mold in a stationary condition, providing a feed means extending into the space between the mandrel and the outer shell, and injecting a polymer into the space between the mandrel and shell, using the feed means, to totally impregnate the fabric of open construction and causing the polymer to be cross-linked.
~ _3_ ~D
~8~2270 Also, in accordance with the present invention, there is provided a method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press. The method comprises the steps of providing an endless base fabric of open construction, providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell, providing a feed pipe having an exit and located in the uniformly spaced area between the smooth mandrel and the outer shell. The method also comprises the steps of disposing the endless base fabric within the mold on the mandrel, and injecting a polymer via the feed pipe directly into the space between the mandrel and shell so as to totally impregnate the fabric of open construction and causing the polymer to be cross-linked.
Also in accordance with the present invention, there is provided a further method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press. The method comprises the steps of providing an endless base fabric of open construction, providing a cylindrical mold with a smooth mandrel, disposing the endless base fabric within the mold on the mandrel. The method also comprises the steps of hermetically sealing the mold by covering it with a uniformly spaced outer shell, injecting a polymer directly into the space between the mandrel and the shell, and applying heat to the mold to cross-link the polymer.
Brief Description of the Drawings Figure 1 is a side elevational view of an extended press nip employing the belt constructed according to the invention;
~ 3a-.~
~a~z%~
Figure 2 is a partially sectional front view of the press nip shown in Fig. l;
Figure 3 is a sectional side elevational view of the belt employed in the invention; and Figure 4 is a partial sectional side view of the apparatus used to produce the belt constructed in accordance with the invention.
Detailed Description of the Invention An extended press nip is provided by the invention for dewatering a travelling web of material. The nip 10 is defined by a cylindrical press roll 12, a pressure shoe 14 having an arcuate surface facing the press roll, and a belt 16 arranged such that it bears against the surface of the press roll. The arcuate surface of the pressure shoe has about the same radius of curvature as the press roll. The distance between the press roll and the pressure shoe may be -3b-lZ~ 0 1 adjusted by means of conventional hvdraulic or mechanical apparatus (not shown) connected to a r,od 18 pivotally secured to the shoe 14. The rod may also be actuated to apply the desired pressure;to the shoe. It will be appreciated that the pressure shoe and press roll described above as shown in Figures 1-2 are conventional and that other arrangements are also well known in the art.
Paper web 24 is carried to and away from the nip by a first felt 26. A second felt 28 is used to absorb the water expressed from web 24 in the nip.
A lubricating means 30 is used to apply a lubricant such as oil to the inner surface 16' of belt 16 to further reduce friction between said inner surface and shoe 14. The belt is entrained by rollers 32 used to drive the belt in a predetermined path as shown.
The belt 16 employed in accordance with the invention is shown in detail in Figure 3. It has proven to be superior to belts currently known to the art both from an operational standpoint and for manufacturing considerations.
20 The belt 16 comprises a base fabric 34 which is impregnated with a polymeric material 36. Thermosetting resins such as polyurethanes have been found to be suitable impregnating materials. Preferably a 100% polyurethane resin should be used to avoid formation of bubbles during the curing of the 25 belt structure. Thermoplastic polymers such as polypropylene are also acceptable.
The base fabric 34 is sufficiently open to allow total impregnation. This eliminates the possibility of any voids forming in the final fabric which would allow the 30 lubrication used between the belt and shoe to pass through the belt and contaminate the felt and fibrous web. It is endless in final construction and uniform in thickness. The 1~8~270 l fabric must also be made to have sufficient stability under paper machine conditions. In other words, it must have - length stàbility, width stability, and guideability.
The base fabric may comprise a single or multi-layered flat woven fabric which has been heat stabilized and joined using normal joining techniques. The base fabric may be made of polyester or other polymeric materials having the necessary properties in accordance with the invention. The base may be made endless by endless weaving also.
At least one of the sides or surfaces of thé belt, such as side 16', is smooth for contacting the pressure shoe 14.
Belts manufactured in accordance with the invention have been found to have many desirable characteristics.
They move easily over the pressure shoe and are capable of transmitting pressure from the shoe to the web and press roll. Sufficient flexibility is obtained, and the belts have proven to be unaffected by lubricant applied prior to entering the press nip.
The belt is manufactured in a cylindrical mold 38 (Figure 4) with an outer shell 39 and a concentric mandrel 42. The mandrel is provided with a smooth outer surface 40.
The spacing between the outer shell 39 of the mold and the inner mandrel determines the thickness or caliper of the belt. The base fabric 32 is first placed on the smooth mandrel surface 40 and then the mold 38 is hermetically sealed with cover 44. Next, the pressure within the mold is reduced by substantially removing the air contained therein via a pipe 46 connected to a vacuum source (not shown).
After the pressure within the mold has been reduced, an appropriate polymer is injected into the mold through pipe 48. Because of the low pressure inside the mold, the polymer quic~ly fills the mold including the interstices of ~zaz270 1 the fabric. Advantageously, a smooth inrer polymer surface is formed along the mandrel surface 40. The polymer is cross-linked by applving heat to the mold. After the polymer has cured the finished belt may be removed from the mold.
Alternatively a polymer catalyst mixture may be used which is self cross linking if left undisturbed several hours.
The resulting belt is shown in Figure 3, with the fabric 34 being fully impregnated with and impermeable to oil and other substances. The belt has a uniform caliper as a result of the molding operation.
Numerous modifications can be made to the invention without departing from its scope as defined in the appended claims.
The web finally proceeds to a drying section including heated dryer drums where the water content is reduced to a desirable level.
In view of the high cost of energy, it is desirable to remove as much water as possible from the web prior to its entering the drying section. The dryer drums in this section are often heated by steam and costs can be substantial if a large amount of water needs to be removed.
The use of extended press nips has been found to be advantageous over the use of nips formed by pairs of adjacent rollers. By extending the time the web is subjected to pressure in the nip, a greater amount of water can be removed. This fact has been recognized by those skilled in the art, and several patents have been granted in the area.
These U.S. patents include Re. 30,268 (May 6, 1980, Edgar J.
Justus), 4,201,624 tMay 6, 1980, William C. Mohr et al), 4,229,253 (October 21, 1980, Dennis C. Cronin) and 4,229,254 (October 21, 1980, Michael L. Gill).
~`
,~ -1-1~8ZZ70 1 In using extended press nips to dewater a fibrous web, the web has typically been sandwiched between two moisture absorbing felts and a belt. The felts are trained around a cylindrical press roll with the web between them while the S belt is arranged for applying pressure to the felts and roll. A pressure shoe exerts pressure on the belt in the press area.
The belt is provided with a very smooth surface for contacting the shoe so that it can transfer pressure to the felts and the fibrous webs without overheating or wearing away. Furthermore the belt must be impermeable to oil used to lubricate its passage over the shoe which could conta-minate the felts and the web. Heretofore the belt was made by applying a polymer coating to the outer surface of an endless fabric. Since the belt is arranged so that its inner surface is the shoe-contacting surface, the endless coated fabric i5 then reversed (i.e. turned inside out).
While this procedure was satisfactory for belts having a length of 24 feet or more, it has been found that it is difficult to reverse belts having a length of less than 24 feet. Furthermore it was found that it was difficult to, apply the coating to the outer surface of shorter belts.
OBJECTIVES AND SUMMARY OF T~E INVENTION
An objective of the present invention is to provide a relatively short belt with a smooth inner surface, adapted to be used in an extended press nip.
Another objective is to provide a belt which is impermeable to oil.
A further objective is to provide a method of producing the above-mentioned belt.
; -2-827~'70 Other objectives and advantages shall become apparent from the following description of the invention. According to this invention a belt is constructed of an endless base fabric embedded in a polymeric substance formed with a smooth, frictionless inner surface. The belt is made by providing a mandrel with a smooth outer surface, placing the endless base fabric on said mandrel covering with an outer shell, and then impregnating the base fabric with a polymer.
As the polymer solidifies the outer surface of the mandrel forms a smooth inner polymer surface.
Therefore, a construction in accordance with the present invention comprises an endless papermaking belt for use in a papermaking extended nip press which includes an endless base fabric of open construction, an impregnating material penetrating the base fabric to form a smooth inner surface thereon. The base fabric is completely contained within the impregnating material.
Also, in accordance with the present invention, there is provided a method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press. The method comprises the steps of providing an endless base fabric of open construction, providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell, and disposing the endless base fabric within the mold on the mandrel. The method also comprises the steps of maintaining the cylindrical mold in a stationary condition, providing a feed means extending into the space between the mandrel and the outer shell, and injecting a polymer into the space between the mandrel and shell, using the feed means, to totally impregnate the fabric of open construction and causing the polymer to be cross-linked.
~ _3_ ~D
~8~2270 Also, in accordance with the present invention, there is provided a method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press. The method comprises the steps of providing an endless base fabric of open construction, providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell, providing a feed pipe having an exit and located in the uniformly spaced area between the smooth mandrel and the outer shell. The method also comprises the steps of disposing the endless base fabric within the mold on the mandrel, and injecting a polymer via the feed pipe directly into the space between the mandrel and shell so as to totally impregnate the fabric of open construction and causing the polymer to be cross-linked.
Also in accordance with the present invention, there is provided a further method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press. The method comprises the steps of providing an endless base fabric of open construction, providing a cylindrical mold with a smooth mandrel, disposing the endless base fabric within the mold on the mandrel. The method also comprises the steps of hermetically sealing the mold by covering it with a uniformly spaced outer shell, injecting a polymer directly into the space between the mandrel and the shell, and applying heat to the mold to cross-link the polymer.
Brief Description of the Drawings Figure 1 is a side elevational view of an extended press nip employing the belt constructed according to the invention;
~ 3a-.~
~a~z%~
Figure 2 is a partially sectional front view of the press nip shown in Fig. l;
Figure 3 is a sectional side elevational view of the belt employed in the invention; and Figure 4 is a partial sectional side view of the apparatus used to produce the belt constructed in accordance with the invention.
Detailed Description of the Invention An extended press nip is provided by the invention for dewatering a travelling web of material. The nip 10 is defined by a cylindrical press roll 12, a pressure shoe 14 having an arcuate surface facing the press roll, and a belt 16 arranged such that it bears against the surface of the press roll. The arcuate surface of the pressure shoe has about the same radius of curvature as the press roll. The distance between the press roll and the pressure shoe may be -3b-lZ~ 0 1 adjusted by means of conventional hvdraulic or mechanical apparatus (not shown) connected to a r,od 18 pivotally secured to the shoe 14. The rod may also be actuated to apply the desired pressure;to the shoe. It will be appreciated that the pressure shoe and press roll described above as shown in Figures 1-2 are conventional and that other arrangements are also well known in the art.
Paper web 24 is carried to and away from the nip by a first felt 26. A second felt 28 is used to absorb the water expressed from web 24 in the nip.
A lubricating means 30 is used to apply a lubricant such as oil to the inner surface 16' of belt 16 to further reduce friction between said inner surface and shoe 14. The belt is entrained by rollers 32 used to drive the belt in a predetermined path as shown.
The belt 16 employed in accordance with the invention is shown in detail in Figure 3. It has proven to be superior to belts currently known to the art both from an operational standpoint and for manufacturing considerations.
20 The belt 16 comprises a base fabric 34 which is impregnated with a polymeric material 36. Thermosetting resins such as polyurethanes have been found to be suitable impregnating materials. Preferably a 100% polyurethane resin should be used to avoid formation of bubbles during the curing of the 25 belt structure. Thermoplastic polymers such as polypropylene are also acceptable.
The base fabric 34 is sufficiently open to allow total impregnation. This eliminates the possibility of any voids forming in the final fabric which would allow the 30 lubrication used between the belt and shoe to pass through the belt and contaminate the felt and fibrous web. It is endless in final construction and uniform in thickness. The 1~8~270 l fabric must also be made to have sufficient stability under paper machine conditions. In other words, it must have - length stàbility, width stability, and guideability.
The base fabric may comprise a single or multi-layered flat woven fabric which has been heat stabilized and joined using normal joining techniques. The base fabric may be made of polyester or other polymeric materials having the necessary properties in accordance with the invention. The base may be made endless by endless weaving also.
At least one of the sides or surfaces of thé belt, such as side 16', is smooth for contacting the pressure shoe 14.
Belts manufactured in accordance with the invention have been found to have many desirable characteristics.
They move easily over the pressure shoe and are capable of transmitting pressure from the shoe to the web and press roll. Sufficient flexibility is obtained, and the belts have proven to be unaffected by lubricant applied prior to entering the press nip.
The belt is manufactured in a cylindrical mold 38 (Figure 4) with an outer shell 39 and a concentric mandrel 42. The mandrel is provided with a smooth outer surface 40.
The spacing between the outer shell 39 of the mold and the inner mandrel determines the thickness or caliper of the belt. The base fabric 32 is first placed on the smooth mandrel surface 40 and then the mold 38 is hermetically sealed with cover 44. Next, the pressure within the mold is reduced by substantially removing the air contained therein via a pipe 46 connected to a vacuum source (not shown).
After the pressure within the mold has been reduced, an appropriate polymer is injected into the mold through pipe 48. Because of the low pressure inside the mold, the polymer quic~ly fills the mold including the interstices of ~zaz270 1 the fabric. Advantageously, a smooth inrer polymer surface is formed along the mandrel surface 40. The polymer is cross-linked by applving heat to the mold. After the polymer has cured the finished belt may be removed from the mold.
Alternatively a polymer catalyst mixture may be used which is self cross linking if left undisturbed several hours.
The resulting belt is shown in Figure 3, with the fabric 34 being fully impregnated with and impermeable to oil and other substances. The belt has a uniform caliper as a result of the molding operation.
Numerous modifications can be made to the invention without departing from its scope as defined in the appended claims.
Claims (15)
1. An endless papermaking belt for use in a papermaking extended nip press comprising:
an endless base fabric of open construction; and impregnating material penetrating said base fabric to form a smooth inner surface thereon, said base fabric being completely contained within the impregnating material.
an endless base fabric of open construction; and impregnating material penetrating said base fabric to form a smooth inner surface thereon, said base fabric being completely contained within the impregnating material.
2. The endless papermaking belt of Claim 1 wherein said base fabric comprises a woven fabric.
3. The endless papermaking belt of Claim 1 wherein said material is a polymer.
4. The endless papermaking belt of Claim 3 wherein said material is applied to said base fabric in a continuous fashion to render said belt impermeable.
5. The endless papermaking belt of Claim 4 wherein said material is applied by disposing said base fabric on a mandrel with a smooth outer surface and causing said material to deposit on said mandrel and base fabric.
6. A method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press, comprising:
providing an endless base fabric of open construction;
providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell;
disposing the endless base fabric within said mold on said mandrel;
maintaining said cylindrical mold in a stationary condition;
providing a feed means extending into the space between the mandrel and the outer shell; and injecting a polymer into the space between the mandrel and shell, using the feed means, to totally impregnate the fabric of open construction and causing the polymer to be cross linked.
providing an endless base fabric of open construction;
providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell;
disposing the endless base fabric within said mold on said mandrel;
maintaining said cylindrical mold in a stationary condition;
providing a feed means extending into the space between the mandrel and the outer shell; and injecting a polymer into the space between the mandrel and shell, using the feed means, to totally impregnate the fabric of open construction and causing the polymer to be cross linked.
7. The method of Claim 6 wherein the mold is evacuated prior to the injection of said material to force said material to penetrate said base.
8. The method of Claim 7 wherein said material is a polymer, said base is a woven fabric, further comprising heating said mold to cross-link said material to said base.
9. A method of coating an endless base fabric, to produce and endless belt with a smooth inner surface, for use in an extended nip press, comprising:
providing an endless base fabric of open construction;
providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell;
providing a feed pipe having an exit and located in the uniformly spaced area between the smooth mandrel and the outer shell;
disposing the endless base fabric within said mold on said mandrel; and injecting a polymer via the feed pipe directly into the space between the mandrel and shell so as to totally impregnate the fabric of open construction and causing the polymer to be cross-linked.
providing an endless base fabric of open construction;
providing a cylindrical mold with a smooth mandrel and a concentric uniformly spaced outer shell;
providing a feed pipe having an exit and located in the uniformly spaced area between the smooth mandrel and the outer shell;
disposing the endless base fabric within said mold on said mandrel; and injecting a polymer via the feed pipe directly into the space between the mandrel and shell so as to totally impregnate the fabric of open construction and causing the polymer to be cross-linked.
10. The method of Claim 9 wherein the mold is evacuated prior to the injection of said material to force said material to penetrate said base.
11. The method of Claim 10 wherein said material is a polymer, said base is a woven fabric, and further comprising heating said mold to cross-link said material to said base.
12. A method of coating an endless base fabric, to produce an endless belt with a smooth inner surface, for use in an extended nip press, comprising:
providing an endless base fabric of open construction;
providing a cylindrical mold with a smooth mandrel;
disposing the endless base fabric within said mold on said mandrel;
hermetically sealing the mold by covering it with a uniformly spaced outer shell;
injecting a polymer directly into the space between the mandrel and the shell; and applying heat to the mold to cross-link the polymer.
providing an endless base fabric of open construction;
providing a cylindrical mold with a smooth mandrel;
disposing the endless base fabric within said mold on said mandrel;
hermetically sealing the mold by covering it with a uniformly spaced outer shell;
injecting a polymer directly into the space between the mandrel and the shell; and applying heat to the mold to cross-link the polymer.
13. The method of Claim 12 wherein the mold is evacuated prior to the injection of said material to force said material to penetrate said base.
14. The method of Claim 14 wherein said material is a polymer, said base is a woven fabric and further comprising heating said mold to cross-link said material to said base.
15. In a papermaking apparatus comprising an extended nip press and an endless belt, the improvement wherein the endless belt is as defined in Claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71145485A | 1985-03-13 | 1985-03-13 | |
| US711,454 | 1985-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1282270C true CA1282270C (en) | 1991-04-02 |
Family
ID=24858156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000499552A Expired - Fee Related CA1282270C (en) | 1985-03-13 | 1986-01-14 | Papermaking belt with smooth inner surface and method of making same |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0194602B1 (en) |
| JP (1) | JPS61258715A (en) |
| AT (1) | ATE54347T1 (en) |
| BR (1) | BR8506360A (en) |
| CA (1) | CA1282270C (en) |
| DE (1) | DE3672359D1 (en) |
| FI (1) | FI86315C (en) |
| MX (1) | MX162003A (en) |
| NO (1) | NO167097C (en) |
| ZA (1) | ZA859176B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4787946A (en) * | 1987-08-07 | 1988-11-29 | Albany International Corp. | Method of making a paper machine press belt |
| US5201978A (en) * | 1988-04-08 | 1993-04-13 | Beloit Technologies, Inc. | Method of fabricating a blanket for an extended nip press |
| DE3909935C2 (en) * | 1989-03-25 | 1995-04-27 | Oberdorfer F Siebtech Gmbh | Method and device for producing an impermeable and flexible band or hose |
| JPH06287885A (en) | 1991-04-15 | 1994-10-11 | Yamauchi Corp | Endless belt for dehydration press |
| SE468483B (en) * | 1991-05-24 | 1993-01-25 | Nordiskafilt Ab | PRESS AND WAY TO MODIFY A PRESS FOR PRESSURE IN A PAPER MACHINE OR LIKE |
| US5792323A (en) * | 1995-09-07 | 1998-08-11 | Albany International Corp. | Spiral base structres for long nip paper machine press belts |
| DE19537182A1 (en) * | 1995-10-06 | 1997-04-10 | Wuertt Filztuchfab | Pressing device with an extended pressing zone |
| DE50112624D1 (en) * | 2001-04-18 | 2007-07-26 | Stowe Woodward Ag | nip press |
| US6752908B2 (en) | 2001-06-01 | 2004-06-22 | Stowe Woodward, Llc | Shoe press belt with system for detecting operational parameters |
| US7014733B2 (en) | 2002-05-14 | 2006-03-21 | Stowe Woodward L.L.C. | Belt for shoe press and shoe calender and method for forming same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5133157A (en) * | 1974-09-13 | 1976-03-22 | Bando Chemical Ind | SHOONSEIMASATSUDENDOBERUTO NO SEIZOHOHO |
| DE2844907C3 (en) * | 1978-10-14 | 1981-08-13 | Fa. Carl Freudenberg, 6940 Weinheim | Method for producing a delivery belt |
| NL185678C (en) * | 1981-09-24 | 1990-06-18 | Albany Int Corp | Pressing device for dewatering a fiber web, as well as a method for manufacturing an endless belt therefor. |
| JPS5954598U (en) * | 1982-10-01 | 1984-04-10 | 市川毛織株式会社 | Pressure belt for wide nip press of paper machine |
| JPS59100789A (en) * | 1982-12-02 | 1984-06-11 | アルバニ−・インタナシヨナル・コ−ポレ−シヨン | Dehydration press |
| JPS59192794A (en) * | 1983-04-15 | 1984-11-01 | 市川毛織株式会社 | Pressure belt for surface pressure nip press of papermaking machine and production thereof |
| DE3318984A1 (en) * | 1983-05-25 | 1984-11-29 | Fa. F. Oberdorfer, 7920 Heidenheim | MANUFACTURING PROCESS FOR TENSION-RESISTANT, IMPERMEABLE, BENDABLE TAPES, IN PARTICULAR FOR PRESSES FOR THE DRAINAGE OF FIBER FIBER STRIPS |
| JPH07101698B2 (en) * | 1989-07-25 | 1995-11-01 | 日本電気株式会社 | Method for manufacturing resin-sealed semiconductor device |
-
1985
- 1985-11-29 ZA ZA859176A patent/ZA859176B/en unknown
- 1985-12-09 MX MX863A patent/MX162003A/en unknown
- 1985-12-17 FI FI855023A patent/FI86315C/en not_active IP Right Cessation
- 1985-12-18 BR BR8506360A patent/BR8506360A/en not_active IP Right Cessation
-
1986
- 1986-01-14 CA CA000499552A patent/CA1282270C/en not_active Expired - Fee Related
- 1986-02-10 JP JP61026075A patent/JPS61258715A/en active Granted
- 1986-03-07 DE DE8686103042T patent/DE3672359D1/en not_active Expired - Fee Related
- 1986-03-07 EP EP86103042A patent/EP0194602B1/en not_active Expired - Lifetime
- 1986-03-07 AT AT86103042T patent/ATE54347T1/en not_active IP Right Cessation
- 1986-03-12 NO NO860939A patent/NO167097C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0194602A1 (en) | 1986-09-17 |
| NO167097C (en) | 1991-10-02 |
| ATE54347T1 (en) | 1990-07-15 |
| NO860939L (en) | 1986-09-15 |
| NO167097B (en) | 1991-06-24 |
| JPH0357236B2 (en) | 1991-08-30 |
| FI855023A0 (en) | 1985-12-17 |
| FI855023A (en) | 1986-09-14 |
| MX162003A (en) | 1991-03-20 |
| FI86315B (en) | 1992-04-30 |
| EP0194602B1 (en) | 1990-07-04 |
| FI86315C (en) | 1992-08-10 |
| DE3672359D1 (en) | 1990-08-09 |
| JPS61258715A (en) | 1986-11-17 |
| BR8506360A (en) | 1986-12-09 |
| ZA859176B (en) | 1986-08-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |