CA1295866C - Flat structure permeable to liquid, and a method for manufacturing such a structure - Google Patents
Flat structure permeable to liquid, and a method for manufacturing such a structureInfo
- Publication number
- CA1295866C CA1295866C CA 502957 CA502957A CA1295866C CA 1295866 C CA1295866 C CA 1295866C CA 502957 CA502957 CA 502957 CA 502957 A CA502957 A CA 502957A CA 1295866 C CA1295866 C CA 1295866C
- Authority
- CA
- Canada
- Prior art keywords
- belt
- web
- laterally
- press felt
- press
- 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
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0063—Perforated sheets
Landscapes
- Paper (AREA)
- Materials For Medical Uses (AREA)
- Filtering Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The press felt or press wire belt for use in the press section of a papermaking machine comprises an endless flat belt having a web-side surface and an other, opposite surface. The belt is a casting of non-thermoplastic polymeric material having a plurality of widely distributed cast in-place holes formed therethrough in the thicknesswise direction. These holes communicate the web-side surface with the opposite surface and therefore provide the belt with liquid permeability in the thicknesswise direction. Each hole increases in diameter progressively from a micropore forming an end thereof at the web-side surface to a substantially larger pore at the opposite surface. At least one laterally-extending stratum of belt-reinforcing material is embedded in the belt and thereby connected therewith.
The press felt or press wire belt for use in the press section of a papermaking machine comprises an endless flat belt having a web-side surface and an other, opposite surface. The belt is a casting of non-thermoplastic polymeric material having a plurality of widely distributed cast in-place holes formed therethrough in the thicknesswise direction. These holes communicate the web-side surface with the opposite surface and therefore provide the belt with liquid permeability in the thicknesswise direction. Each hole increases in diameter progressively from a micropore forming an end thereof at the web-side surface to a substantially larger pore at the opposite surface. At least one laterally-extending stratum of belt-reinforcing material is embedded in the belt and thereby connected therewith.
Description
..i 5~ 6 A flat structure permeable to liquid, and a method for manufacturing such a structure The present invention relates to a flat structure permeable to liquid, in particular to a press felt used in papermaking machines, and to a method for manufacturing such a structure.
The structure a~cording to the invention is used primarily as a press felt, but it can also be used as a press wire, for example.
In a papermalc.tng machlne, water .is extracted .tn three different sections, i.e. .tn the w.tre section by f.tltering, in the press section by wet pressing, and in the dryer section by evaporation. For economy in papermaking it is important that the web is dewatered as thoroughly as possible before it arrives in the dryer section.
In the wire section, i.e. the forming unit, of the papermaking machine as much water as possible is extracted from the stock by using a wire. By a wire is mean-t an endless fabric through which water is filtered from the stock. The wires are in general made of phosphor-bronze or a synthetic fiber.
The fiber~web which has been formed in the wire section of the papermaki.ng machine still has a high moisture content, which is reduced in the wet press of the papermaking machine by pressing the web, together wi.th one or several press~elts, between rolls. The main function of the wet pressin~ is thus to dewater the web, but its functions also include compacting the web and strengthening it in order to achieve sufficient wet strength. Sufficient.
::
, ,i : ' ~g , ~' ' :
&~6 wet strength of the web is a prerequisite for the web being capable of being moved, without breaking, from the press section to the dryer section and further from one drying drum to another. In the wet press it is possible to use rolls of different types, such as plain, perforated, grooved or coveredrolls. It is also possible to use a press wire between the press felt and the roll surface in order to improve the dewatering ability and to eliminate marking of the paper by the roll.
:' The primary function of the press felt is to receive the water extracted from the web. It is also a functi.on of the felt to support the web in the press and to protect lt from being damaged in the press. The structure o the press elt plays a crucial role in the final quality of the paper. An effective press felt is required to have a good dewatering ability, mechanical strength, a long usage life,and an ability to contribute to producing unmarked paper of an even quality.
In general, needled press felts having a high synthetic fiber content are used. Typically these synthetic fibers are polyamide, polyester and polyacrylic nitrile flbers.
In most felts there is a wad layer attached to the base fabric. The properties of a completed felt can be adjusted by using fibers of different fineness and of different raw materials in the wad needled to the felt. It is :
-~ ~ possible to give the felt the desired properties by combining different types of wad layers. In felts of this type, achieving sufficLent smoothness of the felt is a problem; endeavors have been made to improve the smoothness of felts by, for example, needling a thin layer ; of finer fibers on the web-side surface of the elt.
The press felt has a crucial efect on dewatering, and ``
:.
.:
~2~ 6 therefore its quality is a very important factor. In general ~he aim is to use uncompressible, stiff felts wi~h an open stru~ture. However, a felt which is too open may produce detrimental patterns in the web and an uneven distribution t~f pressure o~h the f iblers c:1f the web .
Present-day felts made totally or in part of syn~hetic fibers have a relatively poor abilitv to resist compression and, ~onsequently, the~ ~ose $heir elasticity ~ld ~mpact, and this decreases their dewatering ability. Also cl~gging substance~ such as fibers promote the compaction of ~e ~tructure and thereby shorten the economical useful life of the felt. ~ecause of the disadvantages prese~ted above, particular attention must be paid to the mal~tenance of the felts, and they must be replaced relatively often. In preqent-day papermaking machines, contlnuous-worklng felt-c~eaning systems are used; these cystems include various felt-maintenance devi~s ~uch as pres~ure ~prays and suction slits extendlng acro~s the wire.
: From U.S. Patent no. 4,446,187 there is known a structure used as a wire or a felt, a structure which comprises a film part having, passing through the film, ducts produced by laser ~eams, and a reinforcement part combined with the film part, consisting of a fabric comprising staple fibers. In a structure of this type the clogging of the ducts and fabrics may also constitute a problem.
~he ob jec t of the present invention is to provide a f lat ~ structure permeable to l~quid, for use especially as a :: : press~felt,:a structure which has a good dewatering ability and a~ high mechanical strength, and by means of which an even distribution Qf pressure is achieved at the nip and the above-menti-oned disadvantages are avoided, It ~, .
' , ~z~ i6 is also an object of the invention to provide a simple structure which is easy to service, xequires little maintenance, and has a long useful l:Lfe. These objectives can be achi~ved by means of the structure according to the invention, which is characterized in that it is made up of a body made of a castable polymerj the body having holes and possibly cavities formed during the casting process, the diameter of these holes increasing substantially progressively from one surface to the other in such a way that the surface facing the web is microporous and the other surface has substantially more open pores, and possibly of a reinforcement material.
The body can be made from castable polymers suitable for this purpose, preerably elastomers, such as casting urethane. Casting urethane is a rubber-like material which is also called urethane rubber. In addition to urethane rubber if is also possible to use other liquid rubberS, such as nitrile rubbers and silicone rubbers.
- :
The castable polymers, such as casting urethane, can easily be blended with polymeric additives such as epoxy~
to form a uniform castable basic material.
The properties of the structure can, when so desired, be modlfied in various ways.
Thus, the mechanical properties, such as stiffness, hardness and~resistance to wear and flex, can be adjusted by selecting a suitable polymer.
The strength~properties can be improved by means of various reinforcement~materials such as glass fiber, chopped fiber, monofilaments, multifilaments, andjor metal netting.
It is also possLble to use both~woven and non-woven :: :
, .
, ~z~
reinforcement materials. Synthetic fibers such as polyamide, aramide ( Kevlar ) a~d polyester fibers are typical raw materials. The reinforcement materials are preferably fitted inside the body.
Casting urethane, being a rubber-lik~e material, has good mechanical-dynamic properties as the body material of ~he structure, and, in addition, at the casting stage it is hlghly reactjve, so that it ls easy to achieve a chemical bond between it and most reinforcement materials.
~he dewatering ability of the structure can be improved and its elasticity can be adjusted by forming in the structure cavlties and/or pores of different shapes and izes; these cavities and pores may be open or closed.
The open porousne~s may al80 be such that the pores are progressiYely more open through the entire s~ructure.
It is also possible to form in the structure cavities which interconnect holes, whereby a possibility for internal equalization of hydraulic pressure ls produced tn the horizontal direction.
Also the surface properties of the structure, as regards friction and release, can be adjusted to be those desired.
The properties of the structure can also be modified by forming a sandwich structure in which the different layers behave mechanically ln different ways.
The web-side surface of the structure according t~ the invention is very smooth and microporous, and the dewatering ability of the structure is good. By means of the~structure according to the invention, a very even pressure is also achieved at the nip, and this even * Trademark ' ' .
~Z~5~
pressure contributes to the formation of paper of even and good quality. In addition, when the structure according to the invention is used, elastic covering of the rolls is not necessary.
The invention also relates to a method for the manufacture of a structure permeable to water, especially a press felt for use in papermaking machines, which method is characterized in that the raw materials of a polymeric material are applied to an endless base which has conical members projecting substantially perpendicularly from the surface of the base; thls procedure is, when necessary, followed by curing, whereafter the structure is detached from the base.
The applying of the raw materlals to the base is preferably done by casting, spreading or spraying. The base must in general be treated with a lubricant so that the completed structure can be easily detached from the base.
According to one preferred embodiment the endless base is .
fitted between two rolls.
According to another embodiment the endless base is fitted ~round a large-diameter roll. The cicrumferential surface of a large-dlameter roll can also constitute the endless base.
The lnvention is described in greater detail below with reference to the accompanying drawing, in which Figure 1 depicts a longitudinal section of the structure according to one embodi.ment~of the invention, Figure 2 depicts a top view of the same structure as~Figure Figure 3 depicts a longitudinal section of th structure - : . :
3~Z95 !3~
according to another embodiment, Figure 4 depicts a longitudinal section of the structure according to one further embodiment, Figure 5 depicts a longitudinal section of the structure according to one further embodiment, and Figure 6 depicts a longitudinal section of an apparatus used for the manufacture of the structure according to the invention.
In Figure 1 the flat body made of castable polymer is indicated by reference numeral 1. The body 1 is preferably made of urethane rubber. The body 1 has conical holes 2.
The web-side surface 3 (Figures 1 and 2) ls microporous and very smooth. The other surace, for its paxt, has pores which are clearly more open. Owing to thls structure, ~he structure according to the invention, when used as a press felt or press wire, has a good dewatering ability and, furthermore, the holes 2 do not get easily clogged.
Figure 3 depicts a structure similar to that in Figure 1, except that it has been reinforced with a reinforcement material 4. Various synthetic fibers, threads and fabrics, glass fi.bers, and metal wires and nettings are among suitable reinforcement materials.
Figure 4 depicts a structure similar to that in Figure 1, except that the structure has pores 5. The pores may be open or closed pores. Open pores make the structure more "sponge-like",~ thereby improving its dewatering ability.
Closed pores, for their part, improve the elasticity properties of the structure.
:
Figure 5 depicts~a structure similar to that in Figure 4, except ~hat~the~structure has cavities 6 which interconnect the holes, and cavities which open into the holes.
.
.
.
~2g~
Only a few embodiments according to the invention are described abo~e, but it is evident that these embodiments can be combined and modi.fied within the scope of the claims. Thus, for example, the structure according to the invention may both be reinforced and contain pores.
With reference to Figure 6, two methods are described below for the manufacture o~ a structure according to the invention. A belt-like mold 7 is stretched between two rolls 9, the surface of the mold having conical spikes 8 the shape of which corresponds to the shape of the holes desired ln the structure. The raw materials of a polymeric materlal are applied to this "mat of nails" to produce a structure of desired thickness. The raw material can be applied by casting, spreading,or spraying. For the final curing of the material, a heat treatment is usually necessary. The completed structure is detached from the "mat of nalls".
If it is desired to reinforce the structure, the applying :: :
of the raw material is carrled out in layers, the reinforcement material being placed between layers.
If it is desired to i.ncrease the porosity of the structure, suitable chemicals, such as volatile substances or water-soluble sub?tances, are added to the polymeric material during the manufacturing process, these substances forming, under the effect of heat or water, pores in the structure. One example of such water-soluble substances is common salt, the grain size of which determines the size of the pores.
:, :
.
;
The structure a~cording to the invention is used primarily as a press felt, but it can also be used as a press wire, for example.
In a papermalc.tng machlne, water .is extracted .tn three different sections, i.e. .tn the w.tre section by f.tltering, in the press section by wet pressing, and in the dryer section by evaporation. For economy in papermaking it is important that the web is dewatered as thoroughly as possible before it arrives in the dryer section.
In the wire section, i.e. the forming unit, of the papermaking machine as much water as possible is extracted from the stock by using a wire. By a wire is mean-t an endless fabric through which water is filtered from the stock. The wires are in general made of phosphor-bronze or a synthetic fiber.
The fiber~web which has been formed in the wire section of the papermaki.ng machine still has a high moisture content, which is reduced in the wet press of the papermaking machine by pressing the web, together wi.th one or several press~elts, between rolls. The main function of the wet pressin~ is thus to dewater the web, but its functions also include compacting the web and strengthening it in order to achieve sufficient wet strength. Sufficient.
::
, ,i : ' ~g , ~' ' :
&~6 wet strength of the web is a prerequisite for the web being capable of being moved, without breaking, from the press section to the dryer section and further from one drying drum to another. In the wet press it is possible to use rolls of different types, such as plain, perforated, grooved or coveredrolls. It is also possible to use a press wire between the press felt and the roll surface in order to improve the dewatering ability and to eliminate marking of the paper by the roll.
:' The primary function of the press felt is to receive the water extracted from the web. It is also a functi.on of the felt to support the web in the press and to protect lt from being damaged in the press. The structure o the press elt plays a crucial role in the final quality of the paper. An effective press felt is required to have a good dewatering ability, mechanical strength, a long usage life,and an ability to contribute to producing unmarked paper of an even quality.
In general, needled press felts having a high synthetic fiber content are used. Typically these synthetic fibers are polyamide, polyester and polyacrylic nitrile flbers.
In most felts there is a wad layer attached to the base fabric. The properties of a completed felt can be adjusted by using fibers of different fineness and of different raw materials in the wad needled to the felt. It is :
-~ ~ possible to give the felt the desired properties by combining different types of wad layers. In felts of this type, achieving sufficLent smoothness of the felt is a problem; endeavors have been made to improve the smoothness of felts by, for example, needling a thin layer ; of finer fibers on the web-side surface of the elt.
The press felt has a crucial efect on dewatering, and ``
:.
.:
~2~ 6 therefore its quality is a very important factor. In general ~he aim is to use uncompressible, stiff felts wi~h an open stru~ture. However, a felt which is too open may produce detrimental patterns in the web and an uneven distribution t~f pressure o~h the f iblers c:1f the web .
Present-day felts made totally or in part of syn~hetic fibers have a relatively poor abilitv to resist compression and, ~onsequently, the~ ~ose $heir elasticity ~ld ~mpact, and this decreases their dewatering ability. Also cl~gging substance~ such as fibers promote the compaction of ~e ~tructure and thereby shorten the economical useful life of the felt. ~ecause of the disadvantages prese~ted above, particular attention must be paid to the mal~tenance of the felts, and they must be replaced relatively often. In preqent-day papermaking machines, contlnuous-worklng felt-c~eaning systems are used; these cystems include various felt-maintenance devi~s ~uch as pres~ure ~prays and suction slits extendlng acro~s the wire.
: From U.S. Patent no. 4,446,187 there is known a structure used as a wire or a felt, a structure which comprises a film part having, passing through the film, ducts produced by laser ~eams, and a reinforcement part combined with the film part, consisting of a fabric comprising staple fibers. In a structure of this type the clogging of the ducts and fabrics may also constitute a problem.
~he ob jec t of the present invention is to provide a f lat ~ structure permeable to l~quid, for use especially as a :: : press~felt,:a structure which has a good dewatering ability and a~ high mechanical strength, and by means of which an even distribution Qf pressure is achieved at the nip and the above-menti-oned disadvantages are avoided, It ~, .
' , ~z~ i6 is also an object of the invention to provide a simple structure which is easy to service, xequires little maintenance, and has a long useful l:Lfe. These objectives can be achi~ved by means of the structure according to the invention, which is characterized in that it is made up of a body made of a castable polymerj the body having holes and possibly cavities formed during the casting process, the diameter of these holes increasing substantially progressively from one surface to the other in such a way that the surface facing the web is microporous and the other surface has substantially more open pores, and possibly of a reinforcement material.
The body can be made from castable polymers suitable for this purpose, preerably elastomers, such as casting urethane. Casting urethane is a rubber-like material which is also called urethane rubber. In addition to urethane rubber if is also possible to use other liquid rubberS, such as nitrile rubbers and silicone rubbers.
- :
The castable polymers, such as casting urethane, can easily be blended with polymeric additives such as epoxy~
to form a uniform castable basic material.
The properties of the structure can, when so desired, be modlfied in various ways.
Thus, the mechanical properties, such as stiffness, hardness and~resistance to wear and flex, can be adjusted by selecting a suitable polymer.
The strength~properties can be improved by means of various reinforcement~materials such as glass fiber, chopped fiber, monofilaments, multifilaments, andjor metal netting.
It is also possLble to use both~woven and non-woven :: :
, .
, ~z~
reinforcement materials. Synthetic fibers such as polyamide, aramide ( Kevlar ) a~d polyester fibers are typical raw materials. The reinforcement materials are preferably fitted inside the body.
Casting urethane, being a rubber-lik~e material, has good mechanical-dynamic properties as the body material of ~he structure, and, in addition, at the casting stage it is hlghly reactjve, so that it ls easy to achieve a chemical bond between it and most reinforcement materials.
~he dewatering ability of the structure can be improved and its elasticity can be adjusted by forming in the structure cavlties and/or pores of different shapes and izes; these cavities and pores may be open or closed.
The open porousne~s may al80 be such that the pores are progressiYely more open through the entire s~ructure.
It is also possible to form in the structure cavities which interconnect holes, whereby a possibility for internal equalization of hydraulic pressure ls produced tn the horizontal direction.
Also the surface properties of the structure, as regards friction and release, can be adjusted to be those desired.
The properties of the structure can also be modified by forming a sandwich structure in which the different layers behave mechanically ln different ways.
The web-side surface of the structure according t~ the invention is very smooth and microporous, and the dewatering ability of the structure is good. By means of the~structure according to the invention, a very even pressure is also achieved at the nip, and this even * Trademark ' ' .
~Z~5~
pressure contributes to the formation of paper of even and good quality. In addition, when the structure according to the invention is used, elastic covering of the rolls is not necessary.
The invention also relates to a method for the manufacture of a structure permeable to water, especially a press felt for use in papermaking machines, which method is characterized in that the raw materials of a polymeric material are applied to an endless base which has conical members projecting substantially perpendicularly from the surface of the base; thls procedure is, when necessary, followed by curing, whereafter the structure is detached from the base.
The applying of the raw materlals to the base is preferably done by casting, spreading or spraying. The base must in general be treated with a lubricant so that the completed structure can be easily detached from the base.
According to one preferred embodiment the endless base is .
fitted between two rolls.
According to another embodiment the endless base is fitted ~round a large-diameter roll. The cicrumferential surface of a large-dlameter roll can also constitute the endless base.
The lnvention is described in greater detail below with reference to the accompanying drawing, in which Figure 1 depicts a longitudinal section of the structure according to one embodi.ment~of the invention, Figure 2 depicts a top view of the same structure as~Figure Figure 3 depicts a longitudinal section of th structure - : . :
3~Z95 !3~
according to another embodiment, Figure 4 depicts a longitudinal section of the structure according to one further embodiment, Figure 5 depicts a longitudinal section of the structure according to one further embodiment, and Figure 6 depicts a longitudinal section of an apparatus used for the manufacture of the structure according to the invention.
In Figure 1 the flat body made of castable polymer is indicated by reference numeral 1. The body 1 is preferably made of urethane rubber. The body 1 has conical holes 2.
The web-side surface 3 (Figures 1 and 2) ls microporous and very smooth. The other surace, for its paxt, has pores which are clearly more open. Owing to thls structure, ~he structure according to the invention, when used as a press felt or press wire, has a good dewatering ability and, furthermore, the holes 2 do not get easily clogged.
Figure 3 depicts a structure similar to that in Figure 1, except that it has been reinforced with a reinforcement material 4. Various synthetic fibers, threads and fabrics, glass fi.bers, and metal wires and nettings are among suitable reinforcement materials.
Figure 4 depicts a structure similar to that in Figure 1, except that the structure has pores 5. The pores may be open or closed pores. Open pores make the structure more "sponge-like",~ thereby improving its dewatering ability.
Closed pores, for their part, improve the elasticity properties of the structure.
:
Figure 5 depicts~a structure similar to that in Figure 4, except ~hat~the~structure has cavities 6 which interconnect the holes, and cavities which open into the holes.
.
.
.
~2g~
Only a few embodiments according to the invention are described abo~e, but it is evident that these embodiments can be combined and modi.fied within the scope of the claims. Thus, for example, the structure according to the invention may both be reinforced and contain pores.
With reference to Figure 6, two methods are described below for the manufacture o~ a structure according to the invention. A belt-like mold 7 is stretched between two rolls 9, the surface of the mold having conical spikes 8 the shape of which corresponds to the shape of the holes desired ln the structure. The raw materials of a polymeric materlal are applied to this "mat of nails" to produce a structure of desired thickness. The raw material can be applied by casting, spreading,or spraying. For the final curing of the material, a heat treatment is usually necessary. The completed structure is detached from the "mat of nalls".
If it is desired to reinforce the structure, the applying :: :
of the raw material is carrled out in layers, the reinforcement material being placed between layers.
If it is desired to i.ncrease the porosity of the structure, suitable chemicals, such as volatile substances or water-soluble sub?tances, are added to the polymeric material during the manufacturing process, these substances forming, under the effect of heat or water, pores in the structure. One example of such water-soluble substances is common salt, the grain size of which determines the size of the pores.
:, :
.
;
Claims (6)
1. A press felt for use in a press section of a papermaking machine, comprising:
- an endless flat belt having a web-side surface and an opposite surface, said belt being a casting of non-thermoplastic polymeric material having means defining a plurality of widely distributed cast-in-place holes formed therethrough in a thicknesswise direction so as to communicate said web-side surface with said opposite surface and provide said belt with liquid permeability in said thicknesswise direction;
- each said hole increasing in diameter progressively from a micropore forming an end thereof at said web-side surface to a substantially larger pore than said micropore, formed at said opposite surface;
and - at least one laterally-extending stratum of belt-reinforcing material embedded in said belt and thereby connected therewith.
- an endless flat belt having a web-side surface and an opposite surface, said belt being a casting of non-thermoplastic polymeric material having means defining a plurality of widely distributed cast-in-place holes formed therethrough in a thicknesswise direction so as to communicate said web-side surface with said opposite surface and provide said belt with liquid permeability in said thicknesswise direction;
- each said hole increasing in diameter progressively from a micropore forming an end thereof at said web-side surface to a substantially larger pore than said micropore, formed at said opposite surface;
and - at least one laterally-extending stratum of belt-reinforcing material embedded in said belt and thereby connected therewith.
2. The press felt of claim 1, wherein said polymeric material is an elastomer.
3. The press felt of claim 2, wherein said elastomer is polyurethane.
4. The press felt of claim 1, further comprising means defining a plurality of cast-in-place cavities extending laterally within said belt in at least one of a widthwise and lengthwise direction of said belt, at least some of said cavities laterally interconnecting a respective greater number than two said holes by intersection therewith intermediate the extents of the respective holes in the thickness direction of the belt, whereby, in use, said cavities aid in laterally equalizing internal hydraulic pressure in said belt.
5. The press felt of claim 1, further comprising at least one laterally-extending stratum of belt elasticity-affecting closed-cell pores cast in said belt.
6. The press felt of claim 1, further comprising at least one laterally-extending stratum of belt dewatering ability-affecting open-cell pores cast in said belt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI850844 | 1985-03-01 | ||
| FI850844A FI75893C (en) | 1985-03-01 | 1985-03-01 | SKIVFORMAD VAETSKEGENOMSLAEPPANDE STRUKTUR, OCH FOERFARANDE FOER TILLVERKNING AV DENSAMMA. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1295866C true CA1295866C (en) | 1992-02-18 |
Family
ID=8520452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 502957 Expired CA1295866C (en) | 1985-03-01 | 1986-02-28 | Flat structure permeable to liquid, and a method for manufacturing such a structure |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0250421B1 (en) |
| JP (1) | JPS62502347A (en) |
| AU (1) | AU575474B2 (en) |
| BR (1) | BR8607073A (en) |
| CA (1) | CA1295866C (en) |
| DE (1) | DE3674402D1 (en) |
| DK (1) | DK164125C (en) |
| FI (1) | FI75893C (en) |
| SU (1) | SU1671164A3 (en) |
| WO (1) | WO1986005219A1 (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4657806A (en) * | 1985-03-25 | 1987-04-14 | Albany International Corp. | Wet press papermakers felt |
| US4795480A (en) * | 1986-12-10 | 1989-01-03 | Albany International Corp. | Papermakers felt with a resin matrix surface |
| US4740409A (en) * | 1987-03-31 | 1988-04-26 | Lefkowitz Leonard R | Nonwoven fabric and method of manufacture |
| US5201978A (en) * | 1988-04-08 | 1993-04-13 | Beloit Technologies, Inc. | Method of fabricating a blanket for an extended nip press |
| US5407563A (en) * | 1990-05-24 | 1995-04-18 | Brackett Green Limited | Screening panels |
| GB9016619D0 (en) * | 1990-07-28 | 1990-09-12 | Scapa Group Plc | Endless belts for extended nip dewatering presses |
| ES2144162T3 (en) * | 1996-01-25 | 2000-06-01 | Munzinger Conrad & Cie Ag | BAND OF MATERIAL AND PROCEDURE FOR ITS MANUFACTURE. |
| EP0786551B1 (en) * | 1996-01-25 | 2000-01-19 | CONRAD MUNZINGER & CIE AG | Process for making a web of material |
| GB9703037D0 (en) * | 1997-02-14 | 1997-04-02 | Scapa Group Plc | Filter press belt |
| WO2001014635A1 (en) | 1999-08-20 | 2001-03-01 | Astenjohnson, Inc. | Bi-component molded modular link and a fabric made from a plurality thereof |
| DE10084909T1 (en) | 1999-08-20 | 2002-09-12 | Astenjohnson Inc | Molded modular link and fabric made from a variety of such links |
| JP4592230B2 (en) * | 2001-07-31 | 2010-12-01 | 日本フエルト株式会社 | Papermaking belt |
| US7128810B2 (en) | 2002-10-10 | 2006-10-31 | Albany International Corp. | Anti-rewet press fabric |
| US8822009B2 (en) * | 2008-09-11 | 2014-09-02 | Albany International Corp. | Industrial fabric, and method of making thereof |
| EP2334869B1 (en) * | 2008-09-11 | 2018-01-17 | Albany International Corp. | Permeable belt for the manufacture of tissue, towel and nonwovens |
| ES2582007T3 (en) | 2009-01-28 | 2016-09-08 | Albany International Corp. | Industrial fabric for the production of non-woven products and method of manufacturing |
| DE102010040089A1 (en) | 2010-09-01 | 2012-03-01 | Voith Patent Gmbh | Punched foil covering |
| US8980062B2 (en) * | 2012-12-26 | 2015-03-17 | Albany International Corp. | Industrial fabric comprising spirally wound material strips and method of making thereof |
| CA2962093C (en) | 2014-09-25 | 2021-07-27 | Albany International Corp. | Multilayer belt for creping and structuring in a tissue making process |
| US9957665B2 (en) | 2014-09-25 | 2018-05-01 | Albany International Corp. | Multilayer belt for creping and structuring in a tissue making process |
| US11098450B2 (en) | 2017-10-27 | 2021-08-24 | Albany International Corp. | Methods for making improved cellulosic products using novel press felts and products made therefrom |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE628980C (en) * | 1934-01-03 | 1936-04-20 | Rudolf Haas Dr Ing | Sieve for the purpose of sorting or dewatering in the manufacture of paper or the like. |
| CH392239A (en) * | 1960-07-23 | 1965-05-15 | Heimbach Gmbh Thomas Josef | Filter web for sheet formation and for fabric drainage and drying in paper machines or the like |
| CS198481B1 (en) * | 1977-05-20 | 1980-06-30 | Cestmir Balcar | Multilayer felt,method of and apparatus for manufacturing same |
| SE429769B (en) * | 1980-04-01 | 1983-09-26 | Nordiskafilt Ab | ARKAGGREGT AND WAY TO MANUFACTURE THE SAME |
| BR8303857A (en) * | 1982-07-22 | 1984-02-28 | Wiggins Teape Group Ltd | PAPER MANUFACTURING MACHINERY |
-
1985
- 1985-03-01 FI FI850844A patent/FI75893C/en not_active IP Right Cessation
-
1986
- 1986-02-28 JP JP50158486A patent/JPS62502347A/en active Pending
- 1986-02-28 CA CA 502957 patent/CA1295866C/en not_active Expired
- 1986-02-28 EP EP19860901874 patent/EP0250421B1/en not_active Expired
- 1986-02-28 BR BR8607073A patent/BR8607073A/en unknown
- 1986-02-28 WO PCT/FI1986/000021 patent/WO1986005219A1/en active IP Right Grant
- 1986-02-28 AU AU55830/86A patent/AU575474B2/en not_active Ceased
- 1986-02-28 DE DE8686901874T patent/DE3674402D1/en not_active Expired - Lifetime
- 1986-10-31 DK DK522386A patent/DK164125C/en not_active IP Right Cessation
-
1987
- 1987-08-31 SU SU874203311A patent/SU1671164A3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| EP0250421B1 (en) | 1990-09-19 |
| AU5583086A (en) | 1986-09-24 |
| DK522386D0 (en) | 1986-10-31 |
| WO1986005219A1 (en) | 1986-09-12 |
| SU1671164A3 (en) | 1991-08-15 |
| FI75893B (en) | 1988-04-29 |
| FI75893C (en) | 1988-08-08 |
| FI850844A0 (en) | 1985-03-01 |
| DE3674402D1 (en) | 1990-10-25 |
| DK522386A (en) | 1986-10-31 |
| BR8607073A (en) | 1988-02-09 |
| DK164125B (en) | 1992-05-11 |
| AU575474B2 (en) | 1988-07-28 |
| FI850844L (en) | 1986-09-02 |
| JPS62502347A (en) | 1987-09-10 |
| DK164125C (en) | 1992-10-05 |
| EP0250421A1 (en) | 1988-01-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |