CA1190779A - Dewatering press - Google Patents
Dewatering pressInfo
- Publication number
- CA1190779A CA1190779A CA000412052A CA412052A CA1190779A CA 1190779 A CA1190779 A CA 1190779A CA 000412052 A CA000412052 A CA 000412052A CA 412052 A CA412052 A CA 412052A CA 1190779 A CA1190779 A CA 1190779A
- Authority
- CA
- Canada
- Prior art keywords
- belt
- press
- nip
- base fabric
- 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
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/504—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands
- B29C70/506—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands and impregnating by melting a solid material, e.g. sheet, powder, fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
- B30B9/247—Pressing band constructions
-
- 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
- B29K2313/00—Use of textile products or fabrics as reinforcement
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
- Coloring (AREA)
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 has a base fabric impregnated with polymeric material to provide a first side which presents a uniform smooth impervious surface for engagement by the pressure shoe and a second side containing voids into which liquid can be transferred from the felt engaged thereby during the passage of the web, felt and belt through the nip.
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 has a base fabric impregnated with polymeric material to provide a first side which presents a uniform smooth impervious surface for engagement by the pressure shoe and a second side containing voids into which liquid can be transferred from the felt engaged thereby during the passage of the web, felt and belt through the nip.
Description
t7 ~ ~
DEWATERING PRESS
Backqround of the Invention The field of the invention relates to mechanisms for extracting water from a web of material, and more particularly from a fibrous web formed in a papermaking machine.
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 process, 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 includ-ing heated dryer drums where the water content is reduced to a desirable level.
~n 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 sub-stantial 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 yreater 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 patents include Re. 30,268, 4,201,624, 4,229,253 and 4,229,254.
~ n using e~tended 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 belt is arranged for applying pressure to the felts and roll. A pressure shoe exerts pressure on the belt in the press area.
A problem has been encountered during the dewater-ing of webs in extended nips. It has been found that a bulge develops in the belt ahead of the nip. Irhis problem is recognized in U.S. Patent Nos. 4,229,2S3 and 4,229,254, and certain belt constructions are suggested for overcoming the problem.
Summary of the Invention The invention is directed to an apparatus for dewatering a fibrous web including an extended press nip provided hy a roll and a specifically designed belt which is forced toward the roll by a pressure shoe for applying pressure to the felt and fibrous web in the nip. The belt comprises a base fabric which is impregnated with a thermo-plastic or thermosettin~ polymeric material. The base fabric has a coated and irnpregnated side which would operate against the pressure shoe and a second side facing the felt and web. This second side contains voids into which water or other liquid could be transferred during passage of the felt and web through the nip. 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 may be made endless using conventional fabric -technology and then coated with the material.
7~
The resulting structure is both light in weight and suf-ficiently stable to operate under paper machine con-ditions. It has sufficient abrasion resistance to resist any wear that might take place in the ex-tended nip apparatus.
Unlike materials which are built up in the manner of a rubber tire and can flow and/or delaminate, the invention provides a belt which will maintain its integrity~ It also solves the problem of bulging near the press nips.
Brief Description of the Drawin~s Figure 1 is a side elevational view of an extended press nip according to the invention, Figure 2 is a partially sectional front view of the press nip shown in Figure 1, Figure 3 is a sectional side elevational view of a belt employed in the invention, and Figure 4 is a sectional side elevation view of an alternate embodiment of belt employed in the inven-tion.
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 radlus of 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) connec-ted to a rod 18 pivotally secured to the shoe 14. The rod may be 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 ~ 3 --~ J~
in Figures 1-2 are conventional and that other arrangements may be utilized in accordance with the invention.
One embodiment of the belt 16 in accordance with the invention is shown in detail in Figure 3. The belt 16 cornprises a two layer woven monofilament base fabric 20 with multifilament or spun stuffer yarns 21 which is impregnated with a polymeric material 22. Thermosetting resins such as polyurethanes have been found to be suitable impregnating materials. Thermoplastic polymers such as polypropylene are also acceptable.
The base fabric 20 is sufficien-tly open to allow impregnation to eliminate -the possibility of undesirable voids forming in the final fabric on the pressure shoe side.
These voids are undesirable because they would allow the lubrication used between ~he belt and shoe to pass through the belt and contaminate the felt and fibrous web. The stuffer yarns 21 provide a barrier of sufficiently low perme-ability to prevent passage of the resin during the coating and impregnating process to the side with voids. It is endless in final construction 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 guidability.
The thermoplastic resin or thermosetting resin used should be substantially one hundred percent solid composition to avoid the formation of bubbles during the curing process of the resin in the belt structure which could cause voids on the coated side.
Side 17 of the belt can be grounded smooth for contact wi-th the pressure shoe 1~. The opposite side contains voids, as a result of the weave and absence of impregnation, into which liquid can be transferred during the passage of the web, felt and belt throu~h the nip.
A further example of the first embodiment is shown in Figure 4. The components are similar to -those in Fiyure 3.
The components of Figure ~ are numbered as those of Figure 3 with a prime following. ~elt 161 of Fi~ure 4 is a multi layer structure with a barrier layer provided by stuffer yarns 211. These stuffer yarns 211, can be multifilament or spun. The belt is coated and impregnated as described previously to provide a smooth impervious surface 171 and a surface with voids 181 on the remaining side. The use of belt 161 is the same as previously described for belt 16.
A second embodiment of this invention uses a different method of introducing the polymeric material into the belt structure. In this second method polymeric material is pressed into the surface. The depth of penetration is controlled by the pressing force used and the temperature applied. Either thermoset or thermoplastic polyrners can be used. Thermoplastic polymers are especially ad~antageous for this method since their viscosity in melted form can be controlled by temperature. By controlling the viscosity the depth of penetration can be controlled and the necessity of a barrier in the fabric structure is eliminated for polymers of the right viscosity.
In this me~thod the belt 16 is positioned around a pair of rollers. One of the rollers is an oil heated cylinder.
Polymeric material in sheet form, of the proper caliper, is placed between the belt and the heated cylinder and allowed to rotate around the cylinder. The cylinder temperature is maintained at the level desired to melt the polymeric mate-riaL to the proper viscosity~ It is then forced into the belt by -the tension of the belt around -the cylinder and roller.
~n outside pressure roll can be used to create additional pressure if needed. The sheet of polymeric material is trimmed so no overlap occu~s in the material pressed into the belt.
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 trans-mitting 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.
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. A 24'6" X 170" belt impregnated with a thermosetting resin in accordance with the invention weighs about two hurldred pounds. A similar size belt having bulge-resistant characteristics and having a structure defined in the above mentioned patents weighs about twelve hundred pounds. Unlike the heavier belts, the invention does not require a reinforcing structureO
The manufacture of the belt according to the inven-tion may be accomplished economically and without the need formandrels or au-toclaves which limit the size of other belts.
A belt of any length can accordingly be produced. A web may be needled into the woven base if desired. If the base struc-ture has not been woven endless it is joined endless using conventional joining techniques applicable to forming fabrics in the paper industry~
A belt made in accordance with this invention may be utilized with the apparatus shown in Figure 1. llhe belt 1~ is positioned between the pressure shoe and the pressure roller~
The smooth coated side 17 of the belt is engaged by the shoe.
A fibrous web 24 carried between first and second felts 26 and 27 respectively is introduced into the press nip 10. The side of the belt 17 engaging the shoe 14 is lubricated by lubricat-ing means 28 positioned ahead of the nip.
The belt 16 is easily repaired should a hole or other surface irregularity develop therein. The damaged por-tion 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 be sanded.
Because of the excellent fle~ibility characteristics of the base structure and the fact -that the coating layers can be kept to a minimu~, the surface 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.
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 paper~aking machines. Materials other than polyurethane and polypropylene may also be employed as the coating material~ Also the weave of the belt may be altered although a multilayered belt is desirable for creation of the voids.
DEWATERING PRESS
Backqround of the Invention The field of the invention relates to mechanisms for extracting water from a web of material, and more particularly from a fibrous web formed in a papermaking machine.
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 process, 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 includ-ing heated dryer drums where the water content is reduced to a desirable level.
~n 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 sub-stantial 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 yreater 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 patents include Re. 30,268, 4,201,624, 4,229,253 and 4,229,254.
~ n using e~tended 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 belt is arranged for applying pressure to the felts and roll. A pressure shoe exerts pressure on the belt in the press area.
A problem has been encountered during the dewater-ing of webs in extended nips. It has been found that a bulge develops in the belt ahead of the nip. Irhis problem is recognized in U.S. Patent Nos. 4,229,2S3 and 4,229,254, and certain belt constructions are suggested for overcoming the problem.
Summary of the Invention The invention is directed to an apparatus for dewatering a fibrous web including an extended press nip provided hy a roll and a specifically designed belt which is forced toward the roll by a pressure shoe for applying pressure to the felt and fibrous web in the nip. The belt comprises a base fabric which is impregnated with a thermo-plastic or thermosettin~ polymeric material. The base fabric has a coated and irnpregnated side which would operate against the pressure shoe and a second side facing the felt and web. This second side contains voids into which water or other liquid could be transferred during passage of the felt and web through the nip. 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 may be made endless using conventional fabric -technology and then coated with the material.
7~
The resulting structure is both light in weight and suf-ficiently stable to operate under paper machine con-ditions. It has sufficient abrasion resistance to resist any wear that might take place in the ex-tended nip apparatus.
Unlike materials which are built up in the manner of a rubber tire and can flow and/or delaminate, the invention provides a belt which will maintain its integrity~ It also solves the problem of bulging near the press nips.
Brief Description of the Drawin~s Figure 1 is a side elevational view of an extended press nip according to the invention, Figure 2 is a partially sectional front view of the press nip shown in Figure 1, Figure 3 is a sectional side elevational view of a belt employed in the invention, and Figure 4 is a sectional side elevation view of an alternate embodiment of belt employed in the inven-tion.
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 radlus of 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) connec-ted to a rod 18 pivotally secured to the shoe 14. The rod may be 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 ~ 3 --~ J~
in Figures 1-2 are conventional and that other arrangements may be utilized in accordance with the invention.
One embodiment of the belt 16 in accordance with the invention is shown in detail in Figure 3. The belt 16 cornprises a two layer woven monofilament base fabric 20 with multifilament or spun stuffer yarns 21 which is impregnated with a polymeric material 22. Thermosetting resins such as polyurethanes have been found to be suitable impregnating materials. Thermoplastic polymers such as polypropylene are also acceptable.
The base fabric 20 is sufficien-tly open to allow impregnation to eliminate -the possibility of undesirable voids forming in the final fabric on the pressure shoe side.
These voids are undesirable because they would allow the lubrication used between ~he belt and shoe to pass through the belt and contaminate the felt and fibrous web. The stuffer yarns 21 provide a barrier of sufficiently low perme-ability to prevent passage of the resin during the coating and impregnating process to the side with voids. It is endless in final construction 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 guidability.
The thermoplastic resin or thermosetting resin used should be substantially one hundred percent solid composition to avoid the formation of bubbles during the curing process of the resin in the belt structure which could cause voids on the coated side.
Side 17 of the belt can be grounded smooth for contact wi-th the pressure shoe 1~. The opposite side contains voids, as a result of the weave and absence of impregnation, into which liquid can be transferred during the passage of the web, felt and belt throu~h the nip.
A further example of the first embodiment is shown in Figure 4. The components are similar to -those in Fiyure 3.
The components of Figure ~ are numbered as those of Figure 3 with a prime following. ~elt 161 of Fi~ure 4 is a multi layer structure with a barrier layer provided by stuffer yarns 211. These stuffer yarns 211, can be multifilament or spun. The belt is coated and impregnated as described previously to provide a smooth impervious surface 171 and a surface with voids 181 on the remaining side. The use of belt 161 is the same as previously described for belt 16.
A second embodiment of this invention uses a different method of introducing the polymeric material into the belt structure. In this second method polymeric material is pressed into the surface. The depth of penetration is controlled by the pressing force used and the temperature applied. Either thermoset or thermoplastic polyrners can be used. Thermoplastic polymers are especially ad~antageous for this method since their viscosity in melted form can be controlled by temperature. By controlling the viscosity the depth of penetration can be controlled and the necessity of a barrier in the fabric structure is eliminated for polymers of the right viscosity.
In this me~thod the belt 16 is positioned around a pair of rollers. One of the rollers is an oil heated cylinder.
Polymeric material in sheet form, of the proper caliper, is placed between the belt and the heated cylinder and allowed to rotate around the cylinder. The cylinder temperature is maintained at the level desired to melt the polymeric mate-riaL to the proper viscosity~ It is then forced into the belt by -the tension of the belt around -the cylinder and roller.
~n outside pressure roll can be used to create additional pressure if needed. The sheet of polymeric material is trimmed so no overlap occu~s in the material pressed into the belt.
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 trans-mitting 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.
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. A 24'6" X 170" belt impregnated with a thermosetting resin in accordance with the invention weighs about two hurldred pounds. A similar size belt having bulge-resistant characteristics and having a structure defined in the above mentioned patents weighs about twelve hundred pounds. Unlike the heavier belts, the invention does not require a reinforcing structureO
The manufacture of the belt according to the inven-tion may be accomplished economically and without the need formandrels or au-toclaves which limit the size of other belts.
A belt of any length can accordingly be produced. A web may be needled into the woven base if desired. If the base struc-ture has not been woven endless it is joined endless using conventional joining techniques applicable to forming fabrics in the paper industry~
A belt made in accordance with this invention may be utilized with the apparatus shown in Figure 1. llhe belt 1~ is positioned between the pressure shoe and the pressure roller~
The smooth coated side 17 of the belt is engaged by the shoe.
A fibrous web 24 carried between first and second felts 26 and 27 respectively is introduced into the press nip 10. The side of the belt 17 engaging the shoe 14 is lubricated by lubricat-ing means 28 positioned ahead of the nip.
The belt 16 is easily repaired should a hole or other surface irregularity develop therein. The damaged por-tion 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 be sanded.
Because of the excellent fle~ibility characteristics of the base structure and the fact -that the coating layers can be kept to a minimu~, the surface 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.
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 paper~aking machines. Materials other than polyurethane and polypropylene may also be employed as the coating material~ Also the weave of the belt may be altered although a multilayered belt is desirable for creation of the voids.
Claims (10)
1. A press for dewatering a fibrous web including:
a press roll having a cylindrical exterior surface;
a flexible belt;
said belt comprising a base fabric impregnated with a polymeric material;
a first side of said belt having a uniform 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 said first side of said belt and applying pressure to said belt means and fibrous web in said nip through the medium of said belt; and a second side of said belt containing voids into which liquid is transferred from the felt means engaged thereby during the passage of the web, felt means and belt through the nip.
a press roll having a cylindrical exterior surface;
a flexible belt;
said belt comprising a base fabric impregnated with a polymeric material;
a first side of said belt having a uniform 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 said first side of said belt and applying pressure to said belt means and fibrous web in said nip through the medium of said belt; and a second side of said belt containing voids into which liquid is transferred from the felt means engaged thereby during the passage of the web, felt means and belt through the nip.
2. A press as claimed in claim 1, wherein said im-pregnant is substantially 100% solid composition as impregnated into the belt.
3. A press as claimed in claim 1, wherein said base fabric is a multilayer fabric with a non-face layer of stuffer barrier yarns.
4. A press as claimed in claim 2, wherein said base fabric is a multilayer fabric with a non-face layer of stuffer barrier yarns.
5. A press as claimed in claim 1, wherein said im-pregnant is substantially 100% solid polyurethane resin composition as impregnated into the belt.
6. A press as claimed in claims 1 or 2, wherein said base fabric is woven.
7. A press as claimed in claims 3 or 4, wherein the said base fabric is monofilament with the exception of the stuffer yarns which are multifilament or spun.
8. A method for manufacturing an endless belt for use in an extended press nip comprising:
providing an endless base fabric;
coating and impregnating said base fabric by doc-toring into the fabric a polymeric resin from one face curing said resin to form a smooth surface; and providing means to limit the flow of impregnant through the base to create voids on the second face.
providing an endless base fabric;
coating and impregnating said base fabric by doc-toring into the fabric a polymeric resin from one face curing said resin to form a smooth surface; and providing means to limit the flow of impregnant through the base to create voids on the second face.
9. A method for manufacturing an endless belt in accordance with claim 8, wherein the means to limit the flow of impregnant includes stuffer yarns providing a barrier to flow of the polymeric material therethrough.
10. A method for manufacturing an endless belt in accordance with claim 8, wherein the structure of the base fabric is selected to provide voids in the face of the fabric away from the face receiving the impregnant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000472312A CA1201883A (en) | 1981-09-24 | 1985-01-17 | Manufacture of endless belts for use in extended nip press |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US30514881A | 1981-09-24 | 1981-09-24 | |
| US305,148 | 1981-09-24 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000472312A Division CA1201883A (en) | 1981-09-24 | 1985-01-17 | Manufacture of endless belts for use in extended nip press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1190779A true CA1190779A (en) | 1985-07-23 |
Family
ID=23179537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000412052A Expired CA1190779A (en) | 1981-09-24 | 1982-09-23 | Dewatering press |
Country Status (15)
| Country | Link |
|---|---|
| AT (1) | AT383835B (en) |
| AU (1) | AU559745B2 (en) |
| BE (1) | BE894476A (en) |
| BR (1) | BR8205579A (en) |
| CA (1) | CA1190779A (en) |
| CH (1) | CH657647A5 (en) |
| DE (1) | DE3235468A1 (en) |
| FI (1) | FI81150C (en) |
| FR (1) | FR2513281B1 (en) |
| GB (1) | GB2106557B (en) |
| IT (1) | IT1149356B (en) |
| NL (1) | NL185678C (en) |
| NO (1) | NO158430C (en) |
| NZ (1) | NZ201987A (en) |
| SE (1) | SE457542B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4946731A (en) * | 1989-09-28 | 1990-08-07 | Albany International Corp. | Construction for an extended nip press belt |
| DE4026339A1 (en) * | 1989-09-08 | 1991-03-14 | Albany Int Corp | SPECIAL TAPE FOR A DRAINAGE PRESS OF A PAPER MACHINE |
Families Citing this family (27)
| 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 |
| 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 |
| 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 |
| 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 |
| FI72362C (en) * | 1983-10-03 | 1987-05-11 | Tamfelt Oy Ab | FOERFARANDE OCH MEDEL FOER ATT AOSTADKOMMA AVLAEGSNANDE AV VATTEN I EN PRESS VID EN PAPPERSMASKIN. |
| JPS6081391A (en) * | 1983-10-07 | 1985-05-09 | 三菱重工業株式会社 | Endless belt |
| US4571359A (en) * | 1984-12-18 | 1986-02-18 | Albany International Corp. | Papermakers wet-press felt and method of manufacture |
| ZA859176B (en) * | 1985-03-13 | 1986-08-27 | Albany Int Corp | Papermaking belt with smooth inner surface and method of making same |
| DE3801850A1 (en) * | 1988-01-22 | 1989-07-27 | Oberdorfer Fa F | METHOD AND DEVICE FOR THE PRODUCTION OF STRONG STABILITY, LIQUID-IMPERMEABLE, BENDABLE PRESSING BANDS, IN PARTICULAR FOR WET PRESSING OF PAPER MACHINES |
| DE3815278A1 (en) * | 1988-05-05 | 1989-11-16 | Voith Gmbh J M | PRESS RELEASE OF A MACHINE FOR THE PRODUCTION OF A FIBROUS MATERIAL SHEET, IN PARTICULAR PAPER SHEET |
| US4931010A (en) * | 1988-10-31 | 1990-06-05 | Albany International Corp. | Fabrics having hydrophilic and hydrophobic foams |
| US5118557A (en) * | 1988-10-31 | 1992-06-02 | Albany International Corp. | Foam coating of press fabrics to achieve a controlled void volume |
| DE3909935C2 (en) * | 1989-03-25 | 1995-04-27 | Oberdorfer F Siebtech Gmbh | Method and device for producing an impermeable and flexible band or hose |
| DE3914533A1 (en) * | 1989-05-02 | 1990-11-08 | Heimbach Gmbh Thomas Josef | TAPE FOR PAPER MACHINES |
| DE3914534C1 (en) * | 1989-05-02 | 1990-10-18 | Thomas Josef Heimbach Gmbh & Co, 5160 Dueren, De | |
| US4973383A (en) * | 1989-08-11 | 1990-11-27 | Beloit Corporation | Bearing blanket for an extended nip press |
| 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 |
| DE4125279C2 (en) * | 1991-05-29 | 1995-04-06 | Voith Gmbh J M | Device for producing a press jacket for the paper industry and press jacket produced therewith |
| DE4312174A1 (en) * | 1993-04-14 | 1994-10-20 | Wuertt Filztuchfab | Dryer screen for paper machine |
| DE19537182A1 (en) * | 1995-10-06 | 1997-04-10 | Wuertt Filztuchfab | Pressing device with an extended pressing zone |
| JPH10120137A (en) * | 1996-10-21 | 1998-05-12 | Mitsuboshi Belting Ltd | Conveyer belt and manufacture of same |
| DE19900989A1 (en) | 1999-01-13 | 2000-07-27 | Voith Sulzer Papiertech Patent | Belt for machines for the production of material webs |
| US7862879B2 (en) * | 2003-07-31 | 2011-01-04 | Albany International Corp. | Fabrics with v-guides |
| DE102004011665A1 (en) * | 2004-03-10 | 2005-10-06 | Stowe Woodward Ag | Integral shoe press belt |
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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 |
| GB1133696A (en) * | 1966-02-21 | 1968-11-13 | Albany Felt Co | Improvements relating to corrugator belts |
| US3613258A (en) * | 1969-09-15 | 1971-10-19 | Draper Brothers Co | Felt for papermaking machine |
| BE793027A (en) * | 1971-12-20 | 1973-04-16 | Beloit Corp | PRESS CONTROLLED |
| US3783097A (en) * | 1972-05-30 | 1974-01-01 | Beloit Corp | Hydrodynamically loaded web press with slipper bearing shoes |
| 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 |
| 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. |
| GB2106555B (en) * | 1981-09-15 | 1985-10-02 | Albany Int Corp | Improvements relating to extended nip dewatering presses and to the manufacture of belts for use in such presses |
-
1982
- 1982-09-22 NL NLAANVRAGE8203682,A patent/NL185678C/en not_active IP Right Cessation
- 1982-09-22 IT IT49152/82A patent/IT1149356B/en active
- 1982-09-22 NO NO823208A patent/NO158430C/en not_active IP Right Cessation
- 1982-09-22 GB GB08226979A patent/GB2106557B/en not_active Expired
- 1982-09-22 FR FR828215966A patent/FR2513281B1/en not_active Expired
- 1982-09-23 FI FI823265A patent/FI81150C/en not_active IP Right Cessation
- 1982-09-23 NZ NZ201987A patent/NZ201987A/en unknown
- 1982-09-23 CA CA000412052A patent/CA1190779A/en not_active Expired
- 1982-09-23 BE BE0/209080A patent/BE894476A/en not_active IP Right Cessation
- 1982-09-23 BR BR8205579A patent/BR8205579A/en not_active IP Right Cessation
- 1982-09-23 CH CH5634/82A patent/CH657647A5/en not_active IP Right Cessation
- 1982-09-23 AU AU88649/82A patent/AU559745B2/en not_active Expired
- 1982-09-24 DE DE19823235468 patent/DE3235468A1/en active Granted
- 1982-09-24 SE SE8205476A patent/SE457542B/en not_active IP Right Cessation
- 1982-09-24 AT AT0355982A patent/AT383835B/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4026339A1 (en) * | 1989-09-08 | 1991-03-14 | Albany Int Corp | SPECIAL TAPE FOR A DRAINAGE PRESS OF A PAPER MACHINE |
| DE4026339C2 (en) * | 1989-09-08 | 1996-03-14 | Albany Int Corp | Special belt for a dewatering press of a paper machine |
| US4946731A (en) * | 1989-09-28 | 1990-08-07 | Albany International Corp. | Construction for an extended nip press belt |
| AU613835B2 (en) * | 1989-09-28 | 1991-08-08 | Albany International Corp. | Improved construction for an extended nip press belt |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3235468A1 (en) | 1983-05-05 |
| CH657647A5 (en) | 1986-09-15 |
| AU8864982A (en) | 1983-03-31 |
| NL185678C (en) | 1990-06-18 |
| BR8205579A (en) | 1983-08-30 |
| IT1149356B (en) | 1986-12-03 |
| NL8203682A (en) | 1983-04-18 |
| FI823265L (en) | 1983-03-25 |
| NO158430C (en) | 1990-10-04 |
| FI81150C (en) | 1990-09-10 |
| FR2513281A1 (en) | 1983-03-25 |
| DE3235468C2 (en) | 1989-03-16 |
| ATA355982A (en) | 1987-01-15 |
| NO158430B (en) | 1988-05-30 |
| BE894476A (en) | 1983-01-17 |
| NZ201987A (en) | 1986-06-11 |
| FI823265A0 (en) | 1982-09-23 |
| AU559745B2 (en) | 1987-03-19 |
| NL185678B (en) | 1990-01-16 |
| IT8249152A0 (en) | 1982-09-22 |
| GB2106557B (en) | 1985-05-09 |
| GB2106557A (en) | 1983-04-13 |
| SE457542B (en) | 1989-01-09 |
| FI81150B (en) | 1990-05-31 |
| NO823208L (en) | 1983-03-25 |
| SE8205476D0 (en) | 1982-09-24 |
| AT383835B (en) | 1987-08-25 |
| FR2513281B1 (en) | 1985-07-26 |
| SE8205476L (en) | 1983-03-25 |
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