CA1188556A - Dewatering press - Google Patents
Dewatering pressInfo
- Publication number
- CA1188556A CA1188556A CA000411393A CA411393A CA1188556A CA 1188556 A CA1188556 A CA 1188556A CA 000411393 A CA000411393 A CA 000411393A CA 411393 A CA411393 A CA 411393A CA 1188556 A CA1188556 A CA 1188556A
- Authority
- CA
- Canada
- Prior art keywords
- base fabric
- belt
- press
- impregnated
- fabric
- 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
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0809—Fabrics
- B29K2105/0845—Woven fabrics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0068—Permeability to liquids; Adsorption
- B29K2995/0069—Permeability to liquids; Adsorption non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/733—Fourdrinier belts
Abstract
ABSTRACT OF THE DISCLOSURE
A press for dewatering fibrous webs including a nip provided by a roll and an endless belt forced toward the roll by a pressure shoe positioned adjacent thereto for applying pressure to the fibrous web in the nip through the medium of the belt. The belt includes a uniform smooth impervious surface which is engaged by the pressure shoe and has a base fabric impregnated with polymeric material. The base fabric is sufficiently open to have been impregnated without the formation of voids.
A press for dewatering fibrous webs including a nip provided by a roll and an endless belt forced toward the roll by a pressure shoe positioned adjacent thereto for applying pressure to the fibrous web in the nip through the medium of the belt. The belt includes a uniform smooth impervious surface which is engaged by the pressure shoe and has a base fabric impregnated with polymeric material. The base fabric is sufficiently open to have been impregnated without the formation of voids.
Description
s ~ 5~i6 Il ~DE~ATERING P~CS
Il Background of the I~vention ¦ The field of the lnvention relates to mechanisms Il ~or extracting water from a web of materlal, and more particu- ~
11 larly from a fibrous web formed in a papermaking machine. I
¦~ During the ~apermaking process, a web i5 formed by depositing a ~ibrou.s slurry on a forminq wire. A large amount of water is drained from the slurry during this process, after which the ne~ly-formed web proceeds to a press section. The press section ~ncludes a series o 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 vi`ew of the high cost of energv, it is desirable Il to remove as much water as possible from the web prior to its l.S I entering the drying section. The dryer drums in this section l are often heated by steam and costs can be substantial if a i large amount of water needs to be removedO
The use of exte~ded press nips has been Eound to be l 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 I has been recogni~ed by those skilled in the art, and several patents have been granted in the area. These patents include Il Re. 30,268, 4,201,624, 4,229,253 and 4~229~254O
1l In using extended press nips to dewater a fibrous web, the web has typically been sandwiched between two moisture-Il absorbing ~elts and a ~elt. The felts are trained around a I I cylindrical press roll with the web between them while the belt .i~ arranged for applying pressure to the felts and roll. A
pressure shoe exerts pressure on the belt in the press area.
. ' ~
_.~, , . .. ,, , . .......................... ,, I
,. . . '; ~' , . ' 6 l A problem has been encountered during the dewatering of webs in extended nips. It has been found that a bulge deve-lopes in the belt ahead of the nip. This problem is recognized in U~S. Patent Nos. 4,229,253 and 4,229,254, and certain belt S constructions are suggested for overcoming the problem.
.
Summary of_the Invention The invention is directed to an apparatus for dewater-ing a fibrous web including an extended press nip provided by a roll and a specifically designed bel~ which is forced toward the .roll by a pressure shoe for applying pressure to the fibrous web and one or more web transporting papermakers felts in the nip. The belt comprises a base fabric which is impregnated with a thermoplastic or thermosetting polymeric material. The base fabric which can be single layer or multilayer, is sufficiently open to allow total impregnation of the material to eliminate any voids in the final fabric. A
significant advantage of this belt construction is that it can be made in any length since it does not require a mandrel during the manufacture thereof. A base fabric is provided endless u~ing conventional fabric technology and then coated and impregnated with the polymeric material.
The resulting structure is both light in weight and sufficiently stable to operate under paper machine conditions`.
It has sufficient abrasion resi5tance to resist any wear that might take place in the extended nip apparatus. Unlike materials which are built up in the manner of a rubber tire and can flow and/or delaminate, ~e invention provides a belt which will maintain its integrity. It also solves the problem of bulging near the press nips. The belt has a uniform smooth polymeric 30 surface Which is engaged by a pressure shoe applying pressure ' ', '.: ,' . - , r-r-l~ in the direction of the roll.
¦ Brief Description of the Drawi_gs Figure 1 is a side elevational view o~ an extended ¦ press nip according to the invention;
5 ¦ Figure 2 is a partially sectional front view of I the press nip shown in Figure l; and Figure 3 is a sectional side elevational view of the belt employed in the invention.
Detailed Description cf the Invention .. . . . _ _ . ___ _ An extended press nip is provided by the invention for dewatering a tra~elling 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 lS roll. The arcuate surface of the pressure shoe has about the same radius o curvature as the press roll. The distance between the press roll and the pressure shoe may be adjusted by means of conventional hydraulic or mechanical apparatus (not shown~
connected to a rod 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 and shown in Figures 1-2 are conventional and that Qther arrangements may be utilized in accordance with the invention.
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. The belt 16 comprises a base fabric 20 which is impregnated with a polymeric materiai. 22. Thermosetting resins such as polyurethanes have been _ 3 _ . . ~ , A' / ' ' ~'' ~ ' .
~ . y''~
35~6 found to be suitable impregnating materials. Thermoplastic polymers such as polypropylene are also acceptable.
The base fabric 20 is sufficiently open to allow total impregnation. This eliminates the possibility of any voids form-I ing in the final fabric which would allow the lubrication usedbetween the belt and shoe to pass through the belt and contami-nate the felt and fibrous web. It is endless in final construc-tion and uniform in thickness~ The fabric must also be made to have sufficient stability under paper machine conditions. In other words, it must have length stability, width stability, and guideability.
The thermoplastic resin or thermosetting resin used, should be a substantially one hundred percent solid composition to avoid the formation of bubbles during the curing process of the resin in the belt structure.
The belt has at least one smooth side 16' which contacts the pressure shoe 14.
Belts manufactured in accordance with the invention have heen found to have many desirable characteristics. They move easily over the pressure shoe and are capable of trans-mitting pressure from the shoe to the web and press roll.
Sufficient flexibi.lity is obtained, and the belts have proven to be unaffected by lubricant applied prior to entering the press nip.
In comparison with belts currently known to the art, the invention provides a belt which is relatively thin and light in weight~ Thick belts have the disadvantage of tending to flow while within the nip. For example a 24'6" X170" belt impregnated with a thermosettiny resin in accordance with the invention weighs about two hundred pounds. A similar size belt naving bulge-resistant characteristics and having a structure defined in theabove mentioned patents weighs about twelve hundred pounds.
Unlike the heavier belts, the invention does not require a , - ;
.
reinforcing structure.
The manufacture of the belt according to the invention I may be accomplished economically and without the need for I mandrels or autoclaves which limit the size of other belts.
5 1l A belt of any length can accordingly be produced. The base ¦ structure is first woven~ A web may be needled into the woven ,I base if desired. If the base structure has not been wo~en endlesls it is then joined endless using conventional joining techni~ues I applicable to formi`ng fabrics in t~e paper industry. A pol~y-¦¦ mer1c material is then appl;ed to the base fabric and forms amechanical interlock therewith. The resin is allowed to cure for a sufficient period of time. After curing, the resin surface may be sanded or ground to provide a belt of uniform l caliper having at least one smooth surface.
~ A belt made in accordance with this invention may be utilized with the apparatus shown in ~igure 1. The belt 16 is positioned between the pressure shoe and the pressure roller.
I The smooth coated side 16~ of the belt is engaged by the shoe.
l A fibrous web 24 carried between first and second felts 26 1 and 27 respectively i`s introduced into the press nip 10. The side of the belt 16 engaging the shoe 14 is lubricated by lubricatlng means 28 positioned ahead of the nip.
The helt 16 is easil~ re~aired should a hole or ~ other surface irregularity de~elop therein. The damaged 1 portion is cleaned with a solvent and a suitable amount of coating is applied with a blade. A heat gun is employed to cure the surface which can then he sanded.
S
.. .. .... --s~i Because of the excellent flexibility characteristics of the base structure and the fact that the coating can be kept to a minimum, the suxface of the belt will have less tendency to fail due to bending fatigue. This is due to the fact that, because of the low caliper, the surface plane of the coated surface is at a minimum distance :From the neutral axis of bending . This reduces the percentage of elongation and compression at the surface plane during bending Example 1 A two-layered monofilament base fabric was flat woven, heat s~abilized, and joined endless using normal joining tech-niques. The fabric was then coated with a 100~ solid polyure-thane resin Dupont Adiprene L 100 and cured. The coating step may be accomplished through the use of a doctor blade or the like to obtain a smooth surface. If the outside surface of the base fabric is coated, it may be turned inside out for use in the application.
e 2 A monofilament fabric is woven into a two layer weave having 5uficient openness. It is heatset and joined endless.
The endless fabric is placed on a finishing machine including a pair of rollers. One of the rollers is an oil heated cylinder.
A polyurethane sheet of proper uniform caliper is placed on the inside surface of the fabric and allowed to pass between the heated cylinder and the fabric structure. The temperature of the oil cylinder is maintained at a substantially constant level to obtain uniform melting and fusing of the plastic film.
The sheet is trimmed so that there is no overlap in the material to be pressed into the fabric structure. As the fabric and sheet pass around the heated cylinder, sufficient heat is maintained .. ., ...... ,., - . : ., ;
to cause the polyurethane to flow into -the fabric. A pressure roll may be used against the outside of the fabric to insure complete impregnation. The polyurethane is plasticised and forced into the voids of the fabric. A smooth surface is obtainec which does not require any further flnishing steps. The use of a 100% polymeric sheet also eliminates any problems which could develop in the finished fabric resulting from the use of an impregnation compound containing solvents or water. After the fabxic has undergone the pressing operation, the edges are trimmed and sealed for operation in a papermaking machine.
Example 3 A monofilament polyester base fabric having sufficient openness for impregnation is provided. The fabric is a two layer weave having both width and length stability. A polypropy-lene film having a thickness of about 0.020 inches or more isfused to the base fabric in the manner described in Example 2.
The temperature of the oil cylinder is maintained at a sub-stantially constant level to obtain uniform melting and fusing of the plastic film. The base fabric has a higher melting temperature than the polypropylene film and is not disturbed by the heating process. After the fabric has underyone the pressing operation, the edges are trimmed and sealed for operation in a paper-making machine.
It will be appreciated that the belt utilized in the invention may include a base fabric made from various polymeric materials having the necessary properties for application in paperma]cing machines. Materials other than polyurethane and polypropylene may also be employed as the coating material.
Il Background of the I~vention ¦ The field of the lnvention relates to mechanisms Il ~or extracting water from a web of materlal, and more particu- ~
11 larly from a fibrous web formed in a papermaking machine. I
¦~ During the ~apermaking process, a web i5 formed by depositing a ~ibrou.s slurry on a forminq wire. A large amount of water is drained from the slurry during this process, after which the ne~ly-formed web proceeds to a press section. The press section ~ncludes a series o 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 vi`ew of the high cost of energv, it is desirable Il to remove as much water as possible from the web prior to its l.S I entering the drying section. The dryer drums in this section l are often heated by steam and costs can be substantial if a i large amount of water needs to be removedO
The use of exte~ded press nips has been Eound to be l 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 I has been recogni~ed by those skilled in the art, and several patents have been granted in the area. These patents include Il Re. 30,268, 4,201,624, 4,229,253 and 4~229~254O
1l In using extended press nips to dewater a fibrous web, the web has typically been sandwiched between two moisture-Il absorbing ~elts and a ~elt. The felts are trained around a I I cylindrical press roll with the web between them while the belt .i~ arranged for applying pressure to the felts and roll. A
pressure shoe exerts pressure on the belt in the press area.
. ' ~
_.~, , . .. ,, , . .......................... ,, I
,. . . '; ~' , . ' 6 l A problem has been encountered during the dewatering of webs in extended nips. It has been found that a bulge deve-lopes in the belt ahead of the nip. This problem is recognized in U~S. Patent Nos. 4,229,253 and 4,229,254, and certain belt S constructions are suggested for overcoming the problem.
.
Summary of_the Invention The invention is directed to an apparatus for dewater-ing a fibrous web including an extended press nip provided by a roll and a specifically designed bel~ which is forced toward the .roll by a pressure shoe for applying pressure to the fibrous web and one or more web transporting papermakers felts in the nip. The belt comprises a base fabric which is impregnated with a thermoplastic or thermosetting polymeric material. The base fabric which can be single layer or multilayer, is sufficiently open to allow total impregnation of the material to eliminate any voids in the final fabric. A
significant advantage of this belt construction is that it can be made in any length since it does not require a mandrel during the manufacture thereof. A base fabric is provided endless u~ing conventional fabric technology and then coated and impregnated with the polymeric material.
The resulting structure is both light in weight and sufficiently stable to operate under paper machine conditions`.
It has sufficient abrasion resi5tance to resist any wear that might take place in the extended nip apparatus. Unlike materials which are built up in the manner of a rubber tire and can flow and/or delaminate, ~e invention provides a belt which will maintain its integrity. It also solves the problem of bulging near the press nips. The belt has a uniform smooth polymeric 30 surface Which is engaged by a pressure shoe applying pressure ' ', '.: ,' . - , r-r-l~ in the direction of the roll.
¦ Brief Description of the Drawi_gs Figure 1 is a side elevational view o~ an extended ¦ press nip according to the invention;
5 ¦ Figure 2 is a partially sectional front view of I the press nip shown in Figure l; and Figure 3 is a sectional side elevational view of the belt employed in the invention.
Detailed Description cf the Invention .. . . . _ _ . ___ _ An extended press nip is provided by the invention for dewatering a tra~elling 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 lS roll. The arcuate surface of the pressure shoe has about the same radius o curvature as the press roll. The distance between the press roll and the pressure shoe may be adjusted by means of conventional hydraulic or mechanical apparatus (not shown~
connected to a rod 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 and shown in Figures 1-2 are conventional and that Qther arrangements may be utilized in accordance with the invention.
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. The belt 16 comprises a base fabric 20 which is impregnated with a polymeric materiai. 22. Thermosetting resins such as polyurethanes have been _ 3 _ . . ~ , A' / ' ' ~'' ~ ' .
~ . y''~
35~6 found to be suitable impregnating materials. Thermoplastic polymers such as polypropylene are also acceptable.
The base fabric 20 is sufficiently open to allow total impregnation. This eliminates the possibility of any voids form-I ing in the final fabric which would allow the lubrication usedbetween the belt and shoe to pass through the belt and contami-nate the felt and fibrous web. It is endless in final construc-tion and uniform in thickness~ The fabric must also be made to have sufficient stability under paper machine conditions. In other words, it must have length stability, width stability, and guideability.
The thermoplastic resin or thermosetting resin used, should be a substantially one hundred percent solid composition to avoid the formation of bubbles during the curing process of the resin in the belt structure.
The belt has at least one smooth side 16' which contacts the pressure shoe 14.
Belts manufactured in accordance with the invention have heen found to have many desirable characteristics. They move easily over the pressure shoe and are capable of trans-mitting pressure from the shoe to the web and press roll.
Sufficient flexibi.lity is obtained, and the belts have proven to be unaffected by lubricant applied prior to entering the press nip.
In comparison with belts currently known to the art, the invention provides a belt which is relatively thin and light in weight~ Thick belts have the disadvantage of tending to flow while within the nip. For example a 24'6" X170" belt impregnated with a thermosettiny resin in accordance with the invention weighs about two hundred pounds. A similar size belt naving bulge-resistant characteristics and having a structure defined in theabove mentioned patents weighs about twelve hundred pounds.
Unlike the heavier belts, the invention does not require a , - ;
.
reinforcing structure.
The manufacture of the belt according to the invention I may be accomplished economically and without the need for I mandrels or autoclaves which limit the size of other belts.
5 1l A belt of any length can accordingly be produced. The base ¦ structure is first woven~ A web may be needled into the woven ,I base if desired. If the base structure has not been wo~en endlesls it is then joined endless using conventional joining techni~ues I applicable to formi`ng fabrics in t~e paper industry. A pol~y-¦¦ mer1c material is then appl;ed to the base fabric and forms amechanical interlock therewith. The resin is allowed to cure for a sufficient period of time. After curing, the resin surface may be sanded or ground to provide a belt of uniform l caliper having at least one smooth surface.
~ A belt made in accordance with this invention may be utilized with the apparatus shown in ~igure 1. The belt 16 is positioned between the pressure shoe and the pressure roller.
I The smooth coated side 16~ of the belt is engaged by the shoe.
l A fibrous web 24 carried between first and second felts 26 1 and 27 respectively i`s introduced into the press nip 10. The side of the belt 16 engaging the shoe 14 is lubricated by lubricatlng means 28 positioned ahead of the nip.
The helt 16 is easil~ re~aired should a hole or ~ other surface irregularity de~elop therein. The damaged 1 portion is cleaned with a solvent and a suitable amount of coating is applied with a blade. A heat gun is employed to cure the surface which can then he sanded.
S
.. .. .... --s~i Because of the excellent flexibility characteristics of the base structure and the fact that the coating can be kept to a minimum, the suxface of the belt will have less tendency to fail due to bending fatigue. This is due to the fact that, because of the low caliper, the surface plane of the coated surface is at a minimum distance :From the neutral axis of bending . This reduces the percentage of elongation and compression at the surface plane during bending Example 1 A two-layered monofilament base fabric was flat woven, heat s~abilized, and joined endless using normal joining tech-niques. The fabric was then coated with a 100~ solid polyure-thane resin Dupont Adiprene L 100 and cured. The coating step may be accomplished through the use of a doctor blade or the like to obtain a smooth surface. If the outside surface of the base fabric is coated, it may be turned inside out for use in the application.
e 2 A monofilament fabric is woven into a two layer weave having 5uficient openness. It is heatset and joined endless.
The endless fabric is placed on a finishing machine including a pair of rollers. One of the rollers is an oil heated cylinder.
A polyurethane sheet of proper uniform caliper is placed on the inside surface of the fabric and allowed to pass between the heated cylinder and the fabric structure. The temperature of the oil cylinder is maintained at a substantially constant level to obtain uniform melting and fusing of the plastic film.
The sheet is trimmed so that there is no overlap in the material to be pressed into the fabric structure. As the fabric and sheet pass around the heated cylinder, sufficient heat is maintained .. ., ...... ,., - . : ., ;
to cause the polyurethane to flow into -the fabric. A pressure roll may be used against the outside of the fabric to insure complete impregnation. The polyurethane is plasticised and forced into the voids of the fabric. A smooth surface is obtainec which does not require any further flnishing steps. The use of a 100% polymeric sheet also eliminates any problems which could develop in the finished fabric resulting from the use of an impregnation compound containing solvents or water. After the fabxic has undergone the pressing operation, the edges are trimmed and sealed for operation in a papermaking machine.
Example 3 A monofilament polyester base fabric having sufficient openness for impregnation is provided. The fabric is a two layer weave having both width and length stability. A polypropy-lene film having a thickness of about 0.020 inches or more isfused to the base fabric in the manner described in Example 2.
The temperature of the oil cylinder is maintained at a sub-stantially constant level to obtain uniform melting and fusing of the plastic film. The base fabric has a higher melting temperature than the polypropylene film and is not disturbed by the heating process. After the fabric has underyone the pressing operation, the edges are trimmed and sealed for operation in a paper-making machine.
It will be appreciated that the belt utilized in the invention may include a base fabric made from various polymeric materials having the necessary properties for application in paperma]cing machines. Materials other than polyurethane and polypropylene may also be employed as the coating material.
Claims (9)
1. A press for dewatering a fibrous web including:
a press roll having a cylindrical exterior surface;
a flexible belt having a uniformly smooth impervious surface;
a nip provided by said press roll and said belt;
papermakers felt means in said nip;
a pressure shoe having an exterior surface engaging the smooth impervious surface of said belt and applying pressure to the fibrous web and said felt means in said nip through the medium of said belt; and said belt comprising a base fabric impregnated with a polymeric material.
a press roll having a cylindrical exterior surface;
a flexible belt having a uniformly smooth impervious surface;
a nip provided by said press roll and said belt;
papermakers felt means in said nip;
a pressure shoe having an exterior surface engaging the smooth impervious surface of said belt and applying pressure to the fibrous web and said felt means in said nip through the medium of said belt; and said belt comprising a base fabric impregnated with a polymeric material.
2. A press as defined in claim 1 wherein said impregnant is substantially 100% solid composition as impregnated into the belt.
3. A press as defined in claim 1 or claim 2 wherein said base fabric is a two-layer monofilament fabric.
4. A press as defined in claim 1 wherein said impregnant is substantially 100% solid polyurethane resin as impregnated into the belt.
5. A press as defined in claim 1 or claim 2 wherein said base fabric is woven.
6. A press as defined in claim 1 or 2 wherein said base fabric is polyester.
7. A method for manufacturing an endless belt for use in an extended press nip, comprising:
providing an endless base fabric;
mounting said base fabric about a cylinder;
introducing a polymeric sheet between said base fabric and said cylinder, said polymeric material having a lower melting point than said base fabric;
heating said cylinder such that said polymeric material melts and impregnates said base fabric, said polymeric material forming a smooth surface on the side of the base fabric facing the cylinder;
removing said impregnated base fabric from said cylinder; and turning said impregnated fabric inside out.
providing an endless base fabric;
mounting said base fabric about a cylinder;
introducing a polymeric sheet between said base fabric and said cylinder, said polymeric material having a lower melting point than said base fabric;
heating said cylinder such that said polymeric material melts and impregnates said base fabric, said polymeric material forming a smooth surface on the side of the base fabric facing the cylinder;
removing said impregnated base fabric from said cylinder; and turning said impregnated fabric inside out.
8. A method as defined in claim 7 including the step of pressing said base fabric towards said cylinder.
9. A method as defined in claims 7 or 8 including the step of trimming the edges of said base fabric after impregnating it with said polymeric material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000470970A CA1205335A (en) | 1981-09-15 | 1984-12-21 | Method of manufacturing an endless resin impregnated belt |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US30234581A | 1981-09-15 | 1981-09-15 | |
| US302,345 | 1981-09-15 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000470970A Division CA1205335A (en) | 1981-09-15 | 1984-12-21 | Method of manufacturing an endless resin impregnated belt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188556A true CA1188556A (en) | 1985-06-11 |
Family
ID=23167364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000411393A Expired CA1188556A (en) | 1981-09-15 | 1982-09-14 | Dewatering press |
Country Status (15)
| Country | Link |
|---|---|
| AT (1) | AT384049B (en) |
| AU (1) | AU558794B2 (en) |
| BE (1) | BE894392A (en) |
| BR (1) | BR8205122A (en) |
| CA (1) | CA1188556A (en) |
| CH (1) | CH656654A5 (en) |
| DE (1) | DE3231039C3 (en) |
| FI (1) | FI81149C (en) |
| FR (1) | FR2512856B1 (en) |
| GB (1) | GB2106555B (en) |
| IT (1) | IT1196552B (en) |
| NL (1) | NL185362C (en) |
| NO (1) | NO159866C (en) |
| NZ (1) | NZ201889A (en) |
| SE (1) | SE457541B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277728A (en) * | 1991-09-25 | 1994-01-11 | Albany International Corp. | Method for manufacturing a belt |
| US5298124A (en) * | 1992-06-11 | 1994-03-29 | Albany International Corp. | Transfer belt in a press nip closed draw transfer |
| US6340413B1 (en) | 1998-03-20 | 2002-01-22 | Albany International Ab | Embossing belt for a paper machine |
| US6547924B2 (en) | 1998-03-20 | 2003-04-15 | Metso Paper Karlstad Ab | Paper machine for and method of manufacturing textured soft paper |
| US6743339B1 (en) | 1998-03-20 | 2004-06-01 | Albany Nordiskafilt Ab | Use of a transfer belt for a soft tissue paper machine |
| WO2005012634A3 (en) * | 2003-08-04 | 2005-09-22 | Astenjohnson Inc | Triple layer industrial fabric for through-air drying process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5238537A (en) * | 1981-09-15 | 1993-08-24 | Dutt William H | Extended nip press belt having an interwoven base fabric and an impervious impregnant |
| 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. |
| US5234551A (en) * | 1981-09-24 | 1993-08-10 | Dutt William H | Extended nip press belt having an interwoven base fabric and an impervious impregnant |
| DE3224760A1 (en) * | 1982-07-02 | 1984-01-05 | Thomas Josef Heimbach GmbH & Co, 5160 Düren | TAPE FOR USE IN WET PRESSES OF PAPER MACHINES |
| 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 |
| JPS6081391A (en) * | 1983-10-07 | 1985-05-09 | 三菱重工業株式会社 | Endless belt |
| US4944820A (en) * | 1988-04-08 | 1990-07-31 | Beloit Corporation | Method for making a blanket for an extended nip press |
| FI89615C (en) * | 1988-04-29 | 1993-10-25 | Albany Int Corp | FOERFARANDE FOER FRAMSTAELLNING AV ETT PRESSBAND |
| DE3909935C2 (en) * | 1989-03-25 | 1995-04-27 | Oberdorfer F Siebtech Gmbh | Method and device for producing an impermeable and flexible band or hose |
| DE3914534C1 (en) * | 1989-05-02 | 1990-10-18 | Thomas Josef Heimbach Gmbh & Co, 5160 Dueren, De | |
| DE3914533A1 (en) * | 1989-05-02 | 1990-11-08 | Heimbach Gmbh Thomas Josef | TAPE FOR PAPER MACHINES |
| US4973383A (en) * | 1989-08-11 | 1990-11-27 | Beloit Corporation | Bearing blanket for an extended nip press |
| DE3926963C1 (en) * | 1989-08-16 | 1990-12-20 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
| DE4020589A1 (en) * | 1990-06-28 | 1992-01-09 | Oberdorfer Fa F | Coated press band for paper making machines - has core fabric with flattened warp and/or weft threads |
| DE4028085C1 (en) * | 1990-09-05 | 1992-02-27 | Thomas Josef Heimbach Gmbh & Co, 5160 Dueren, De | |
| JPH06287885A (en) | 1991-04-15 | 1994-10-11 | Yamauchi Corp | Endless belt for dehydration press |
| DE4115816A1 (en) * | 1991-05-15 | 1992-11-19 | Voith Gmbh J M | Press bands prodn. for paper-making - by feeding e.g. fabric strips obliquely on to roller or substrate belt and embedding them in liq. coating of e.g. polyurethane resin |
| DE4411620C2 (en) * | 1994-04-02 | 2001-05-31 | Voith Sulzer Papiermasch Gmbh | Press jacket and method for producing a press jacket |
| DE4443598C2 (en) * | 1994-12-07 | 2000-05-25 | Voith Sulzer Papiermasch Gmbh | Process for producing a press jacket |
| DE19537182A1 (en) * | 1995-10-06 | 1997-04-10 | Wuertt Filztuchfab | Pressing device with an extended pressing zone |
| DE19900989A1 (en) * | 1999-01-13 | 2000-07-27 | Voith Sulzer Papiertech Patent | Belt for machines for the production of material webs |
| ES2514466T3 (en) | 2005-12-02 | 2014-10-28 | Heimbach Gmbh & Co. Kg | Procedure for manufacturing liquid impervious paper machine belts and coating device for the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1536533A (en) * | 1924-04-01 | 1925-05-05 | William E Sheehan | Wet-web carrier for pulp and paper machines |
| NL6702166A (en) * | 1966-02-21 | 1967-08-22 | ||
| US3509375A (en) * | 1966-10-18 | 1970-04-28 | Honeywell Inc | Switching circuitry for isolating an input and output circuit utilizing a plurality of insulated gate magnetic oxide field effect transistors |
| DE2108423A1 (en) * | 1971-02-22 | 1972-09-07 | VEB Papiermaschinenwerke Freiberg, χ 9200 Freiberg | Wet paper web dehydrating press |
| US3783097A (en) * | 1972-05-30 | 1974-01-01 | Beloit Corp | Hydrodynamically loaded web press with slipper bearing shoes |
| CH563867A5 (en) * | 1973-03-01 | 1975-07-15 | Escher Wyss Gmbh | |
| DE2312816C3 (en) * | 1973-03-15 | 1983-02-03 | Basf Ag, 6700 Ludwigshafen | Process for the continuous production of semi-finished products from glass fiber reinforced thermoplastics |
| US4109543A (en) * | 1976-05-10 | 1978-08-29 | The Goodyear Tire & Rubber Company | Flexible composite laminate of woven fabric and thermoplastic material and method of making said laminate |
| GB1603547A (en) * | 1978-05-18 | 1981-11-25 | Beloit Corp | Blanket for the production of extensible paper |
| US4201624A (en) * | 1978-09-05 | 1980-05-06 | Beloit Corporation | Extended nip press |
| US4229253A (en) * | 1979-04-26 | 1980-10-21 | Beloit Corporation | Extended nip press with special belt reinforcement |
| US4229254A (en) * | 1979-04-26 | 1980-10-21 | Beloit Corporation | Extended nip press with bias ply reinforced belt |
| US4238287A (en) * | 1979-04-26 | 1980-12-09 | Beliot Corporation | Extended nip press with transverse stiffening means in the belt |
| DE2939637C2 (en) * | 1979-09-29 | 1982-12-30 | Drabert Söhne Minden (Westf.), 4950 Minden | Process for the production of an endless printing belt for a device for the continuous pressing and decatizing of fabrics, knitted fabrics and the like. |
-
1982
- 1982-08-11 GB GB08223096A patent/GB2106555B/en not_active Expired
- 1982-08-20 DE DE3231039A patent/DE3231039C3/en not_active Expired - Lifetime
- 1982-08-27 NO NO822903A patent/NO159866C/en not_active IP Right Cessation
- 1982-08-31 BR BR8205122A patent/BR8205122A/en not_active IP Right Cessation
- 1982-09-01 FI FI823016A patent/FI81149C/en not_active IP Right Cessation
- 1982-09-08 NL NLAANVRAGE8203490,A patent/NL185362C/en not_active IP Right Cessation
- 1982-09-13 NZ NZ201889A patent/NZ201889A/en unknown
- 1982-09-13 IT IT49104/82A patent/IT1196552B/en active
- 1982-09-13 BE BE0/209011A patent/BE894392A/en not_active IP Right Cessation
- 1982-09-14 CH CH5446/82A patent/CH656654A5/en not_active IP Right Cessation
- 1982-09-14 AT AT0343282A patent/AT384049B/en not_active IP Right Cessation
- 1982-09-14 CA CA000411393A patent/CA1188556A/en not_active Expired
- 1982-09-14 AU AU88376/82A patent/AU558794B2/en not_active Expired
- 1982-09-14 FR FR8215519A patent/FR2512856B1/en not_active Expired
- 1982-09-15 SE SE8205283A patent/SE457541B/en not_active IP Right Cessation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277728A (en) * | 1991-09-25 | 1994-01-11 | Albany International Corp. | Method for manufacturing a belt |
| US5298124A (en) * | 1992-06-11 | 1994-03-29 | Albany International Corp. | Transfer belt in a press nip closed draw transfer |
| US6340413B1 (en) | 1998-03-20 | 2002-01-22 | Albany International Ab | Embossing belt for a paper machine |
| US6547924B2 (en) | 1998-03-20 | 2003-04-15 | Metso Paper Karlstad Ab | Paper machine for and method of manufacturing textured soft paper |
| US6743339B1 (en) | 1998-03-20 | 2004-06-01 | Albany Nordiskafilt Ab | Use of a transfer belt for a soft tissue paper machine |
| WO2005012634A3 (en) * | 2003-08-04 | 2005-09-22 | Astenjohnson Inc | Triple layer industrial fabric for through-air drying process |
| US7682995B2 (en) | 2003-08-04 | 2010-03-23 | Astenjohnson, Inc. | Triple layer industrial fabric for through-air drying process |
Also Published As
| Publication number | Publication date |
|---|---|
| CH656654A5 (en) | 1986-07-15 |
| DE3231039C2 (en) | 1990-02-15 |
| SE8205283D0 (en) | 1982-09-15 |
| NL185362B (en) | 1989-10-16 |
| SE457541B (en) | 1989-01-09 |
| IT8249104A0 (en) | 1982-09-13 |
| NL8203490A (en) | 1983-04-05 |
| ATA343282A (en) | 1987-02-15 |
| FR2512856A1 (en) | 1983-03-18 |
| GB2106555B (en) | 1985-10-02 |
| NO159866B (en) | 1988-11-07 |
| FI81149B (en) | 1990-05-31 |
| FI823016L (en) | 1983-03-16 |
| FI823016A0 (en) | 1982-09-01 |
| AT384049B (en) | 1987-09-25 |
| FI81149C (en) | 1990-09-10 |
| NZ201889A (en) | 1986-03-14 |
| DE3231039C3 (en) | 1998-03-26 |
| SE8205283L (en) | 1983-03-16 |
| AU8837682A (en) | 1983-03-24 |
| BR8205122A (en) | 1983-08-09 |
| DE3231039A1 (en) | 1983-03-24 |
| BE894392A (en) | 1983-01-03 |
| NO822903L (en) | 1983-03-16 |
| FR2512856B1 (en) | 1986-10-31 |
| AU558794B2 (en) | 1987-02-12 |
| NL185362C (en) | 1990-03-16 |
| GB2106555A (en) | 1983-04-13 |
| NO159866C (en) | 1991-07-03 |
| IT1196552B (en) | 1988-11-16 |
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