CA2068800A1 - Method and apparatus for the production of press belts, particularly for paper machines, as well as press belts produced thereby - Google Patents
Method and apparatus for the production of press belts, particularly for paper machines, as well as press belts produced therebyInfo
- Publication number
- CA2068800A1 CA2068800A1 CA 2068800 CA2068800A CA2068800A1 CA 2068800 A1 CA2068800 A1 CA 2068800A1 CA 2068800 CA2068800 CA 2068800 CA 2068800 A CA2068800 A CA 2068800A CA 2068800 A1 CA2068800 A1 CA 2068800A1
- Authority
- CA
- Canada
- Prior art keywords
- strips
- layer
- belt
- press
- press belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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
- 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
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
- B29C70/222—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure being shaped to form a three dimensional configuration
-
- 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]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D29/00—Producing belts or bands
- B29D29/06—Conveyor belts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
- D21F3/0236—Belts or sleeves therefor manufacturing methods
Abstract
METHOD AND APPARATUS FOR THE PRODUCTION
OF PRESS BELTS, PARTICULARLY FOR PAPER
MACHINES, AS WELL AS PRESS BELTS PRODUCED THEREBY
ABSTRACT OF THE DISCLOSURE
The invention relates to a method and an apparatus for producing a press belt for the wet press of a paper machine and furthermore to such a press belt itself. The invention increases the strength of such a belt and at the same time decrease its cost. Elongate strips, for instance narrow strips of fabric, are embedded in the press belt at an angle inclined to the direction of travel of the belt. The strips are in at least two layers, with overlapping by the strips in one layer of strips over either the gaps between strips in the other layer of strips or over neighboring edges of neighboring strips if the strips in each layer are abutting. Also, the strips in both layers are inclined parallel.
OF PRESS BELTS, PARTICULARLY FOR PAPER
MACHINES, AS WELL AS PRESS BELTS PRODUCED THEREBY
ABSTRACT OF THE DISCLOSURE
The invention relates to a method and an apparatus for producing a press belt for the wet press of a paper machine and furthermore to such a press belt itself. The invention increases the strength of such a belt and at the same time decrease its cost. Elongate strips, for instance narrow strips of fabric, are embedded in the press belt at an angle inclined to the direction of travel of the belt. The strips are in at least two layers, with overlapping by the strips in one layer of strips over either the gaps between strips in the other layer of strips or over neighboring edges of neighboring strips if the strips in each layer are abutting. Also, the strips in both layers are inclined parallel.
Description
2~S ~$00 METHOD AND APPARATUS FOR THE PRODUCTION
OF PRESS BELTS, PARTICULARLY FOR PAPER
MACHINES. AS WELL AS PRESS_BELTS PRODUCED THEREBY
BACK~ROUND OF THE INVENTION
The presant invention relates to a method for and an apparatus for producing press belts, particularly belts for wet presses of paper making machines, and to the press belts themselves. Such press belts comprise stretch resistant, liquid impervious, endle~s loop belts of an elastomeric material having at least two layers of strips which extend at an angle of inclination to the length direction, i.e. the circumferential direction of the belt.
Press belts of this type are used, in particular, in so called extended nip presses or shoe presses. This press comprises a rotatably mounted counter roll against which a stationary shoe can be pressed. The shoe has a concave surface generally corresponding to the outer surface of the roll on the side of the shoe which faces the roll. The press belt in such a press is in the form of an endless belt loop. The inner surface of the belt loop slides over the concave surface of the press shoe. The outer surface of the belt loop supports the web of paper from which the water is to be removed in the press. Examples of shoe presses are seen in U.S. Patents.
Methods for the production of press belts, which belts are useful in shoe presses, are known from German publications:
1) DE 32 31 039 C2 2~ DE 38 01 850 A1 2~688o~
~) DE 39 09 935 4) DE 38 27 486 C2 Insofar as the present invention concerns a method, the invention proceeds from Reference 4, and specifically from Claim 1 thereof, in combination with Claim 16 thereof.
Press belts of this type are intended to satisfy various requirements. In particular, they must be of high strength. At the same time, they should be particularly resistant to stretching. Furthermore, it should be possible to produce them at favorable cost.
Finally, they should have a long life, i.e., in addition to the requirements as to strength, they should also be capable of use for a long time.
SUM~RY OF THE INVENTION
The object of the invention is to provide a method and apparatus and furthermore also a press belt which satisfy all of the foregoing requirements to a high extent.
The press belt of the invention is an elastomeric material belt which has elongate strips in it which strips are all arranged at an inclined angle to the movement direction, which is the circumferential direction of the press belt. For instance, the strips are fabric strips. The concept of the invention is to arrange the strips such that in the completed press belt, the strips are inclined with respect to the circumferential direction of the belt and thus with respect to its direction of travel. The angle of inclination need only be a few degrees, for instance, 5.
Differences plus or minus are however possible, for instance within a range of 0.2 to 2. In this 20688~0 connection, the individual strips preferably extend at the same angle of inclination to the direction of travel of the press belt and are thus parallel to each other, so that no overlapping of the strips occurs. Because at least two layers of the strips are provided, as seen in the cross-section through the press belt, there will, be overlapping by the strips of one layer of strips over the neighboring edges of or the gaps between the neighboring edges of the strips of the other layer of strips. This lo establishes greater strenqth for the entire press belt which generally makes further strengthening measures unnecessary. Such further measures are, for instance, the provision of transverse belts or of transverse cords as reinforcement.
Furthermore, upon belt manufacture, it is much easier to arrange all of the strips at the same angle of inclination with respect to the circumferential direction of the press belt than at different angles. Up to now, it was thought that the crossing of the strips of one layer with those of another layer was necessary in the interest of the strength of the press belt. But, the inventors have discovered that the arrangement of the invention functions quite well.
Other objects and features of the invention are explained with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig 1 schematically shows a device for producing a press belt with the use of a roll unit having two rolls.
Fig. 2 shows a similar device, but employing a single roll.
2Q68~00 Fig. 3 is a transverse cross section through a press belt of the invention perpendicular to the plane of the belt, and also perpendicular to the circumferential direction.
Fig. 4 is a view from above on the roll of Fig. 2 showing stips being deposited on the roll.
DETAILED DESCRIPTION OF THE INVENTION
The apparatus for producing a press belt as shown in Fig. 1 comprises a roll unit which has a first rotatable roll 1 followed by a second rotatable roll 2.
An endless flexible support belt 3 is wrapped around the two rolls 1 and 2. A coating device and a strip laying device are associated with the upper course of the support belt 3.
The coating device includes a pouring nozzle 4 for liquified elastomeric material. The fabric strip laying device comprises a plurality of strip supply spools 5, 6 and 7 for supplying reinforcing fabric strips. The strip spools 5 - 7 are arranged at different positions. The spools are uniformly distributed over the width of the support belt 3. They are also shown sequenced along the circumferential direction, although that aspect of their arrangment is not required. The spools for forming a layer of strips are spaced apart across the width of the belt 3 so as to each be able to lay down a respective continuous strip that is next to but spaced away from the side of the neighboring strips from the other neighboring spools, which produces the separation between neighboring strips in each layer of strips as shown in the cross-section of the press belt in Fig. 3. In Fig. 3, the strips in each layer are shown spaced a short distance apart. The strips in a layer may alternately be abutting as shown in Fig. 4.
Although three spools are shown in Fig. 1, their number is dependent on the width of each strip, the spacing between neighboring strips and the width of the belt 3. It is also possible to have a respective set of strip spools for each layer of strips at the support belt 3, with the spools for one layer being laterally offset from the respective spools for the other layer by the distance enabling the strips of each layer to extend along the gaps between the strips of the other layer.
Still liquid form polyurethane, which forms a first layer 8 of a coating composition, emerges from the nozzle 4 onto the belt 3. Upon the rotation of the support belt 3, the layer 8 moves along the belt. The strips from the strip spools or laying devices 5 to 7 are embedded into the coating composition in a slightly spaced apart array across the coating layer, as shown in Fig. 3, or essentially abutting, as shown in Fig. 4. As the belt 3 moves, the spools 5 to 7 gradually translate across the belt 3, creating an array of strips whose directions are slightly incined from the length or circumferential direction of the belt 3. A second layer of liquid polyurethane is then laid down and to it is supplied a second row of strips, building up the multiple layer press belt. The spools for the subsequent layer of strips are offset so as to cause the later applied strips to overlie the gaps between or the abutting edges of the earlier applied strips. After the press belt has been formed on the support belt 3, the formed press belt is removed from the support belt.
The device shown in Fig. 2 uses only a single roll 10. The roll is preferably of steel. The outer surface of the roll 10 is ground. Before starting the press belt forming work with this device, the outer surface of the roll 10 is treated with a parting agent, for instance, silicone oil. The other devices, of this embodiment namely the coating application and strip laying devices, are fundamentally the same as in the embodiment of Fig. 1.
The press blanket as shown in Fig. 3 is produced by the following steps using either device of Figs. 1 and 2 disclosed above.
1. The support belt is moved.
2. A first thin layer of polyurethane is poured onto the belt 3 or the steel roll 10, without an included reinforcement in the layer.
3. A second thin layer of polyurethane is poured on, with simultaneous wrapping of a layer comprising a plurality of fabric belts having the width of the nozzle advance (i.e., half the width of the nozzle). As the polyurethane is being poured and the strips are being laid, the spools 5-7 are translating slowly across the belt 3, giving the strips their incline to the direction of movement of the belt 3.
OF PRESS BELTS, PARTICULARLY FOR PAPER
MACHINES. AS WELL AS PRESS_BELTS PRODUCED THEREBY
BACK~ROUND OF THE INVENTION
The presant invention relates to a method for and an apparatus for producing press belts, particularly belts for wet presses of paper making machines, and to the press belts themselves. Such press belts comprise stretch resistant, liquid impervious, endle~s loop belts of an elastomeric material having at least two layers of strips which extend at an angle of inclination to the length direction, i.e. the circumferential direction of the belt.
Press belts of this type are used, in particular, in so called extended nip presses or shoe presses. This press comprises a rotatably mounted counter roll against which a stationary shoe can be pressed. The shoe has a concave surface generally corresponding to the outer surface of the roll on the side of the shoe which faces the roll. The press belt in such a press is in the form of an endless belt loop. The inner surface of the belt loop slides over the concave surface of the press shoe. The outer surface of the belt loop supports the web of paper from which the water is to be removed in the press. Examples of shoe presses are seen in U.S. Patents.
Methods for the production of press belts, which belts are useful in shoe presses, are known from German publications:
1) DE 32 31 039 C2 2~ DE 38 01 850 A1 2~688o~
~) DE 39 09 935 4) DE 38 27 486 C2 Insofar as the present invention concerns a method, the invention proceeds from Reference 4, and specifically from Claim 1 thereof, in combination with Claim 16 thereof.
Press belts of this type are intended to satisfy various requirements. In particular, they must be of high strength. At the same time, they should be particularly resistant to stretching. Furthermore, it should be possible to produce them at favorable cost.
Finally, they should have a long life, i.e., in addition to the requirements as to strength, they should also be capable of use for a long time.
SUM~RY OF THE INVENTION
The object of the invention is to provide a method and apparatus and furthermore also a press belt which satisfy all of the foregoing requirements to a high extent.
The press belt of the invention is an elastomeric material belt which has elongate strips in it which strips are all arranged at an inclined angle to the movement direction, which is the circumferential direction of the press belt. For instance, the strips are fabric strips. The concept of the invention is to arrange the strips such that in the completed press belt, the strips are inclined with respect to the circumferential direction of the belt and thus with respect to its direction of travel. The angle of inclination need only be a few degrees, for instance, 5.
Differences plus or minus are however possible, for instance within a range of 0.2 to 2. In this 20688~0 connection, the individual strips preferably extend at the same angle of inclination to the direction of travel of the press belt and are thus parallel to each other, so that no overlapping of the strips occurs. Because at least two layers of the strips are provided, as seen in the cross-section through the press belt, there will, be overlapping by the strips of one layer of strips over the neighboring edges of or the gaps between the neighboring edges of the strips of the other layer of strips. This lo establishes greater strenqth for the entire press belt which generally makes further strengthening measures unnecessary. Such further measures are, for instance, the provision of transverse belts or of transverse cords as reinforcement.
Furthermore, upon belt manufacture, it is much easier to arrange all of the strips at the same angle of inclination with respect to the circumferential direction of the press belt than at different angles. Up to now, it was thought that the crossing of the strips of one layer with those of another layer was necessary in the interest of the strength of the press belt. But, the inventors have discovered that the arrangement of the invention functions quite well.
Other objects and features of the invention are explained with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig 1 schematically shows a device for producing a press belt with the use of a roll unit having two rolls.
Fig. 2 shows a similar device, but employing a single roll.
2Q68~00 Fig. 3 is a transverse cross section through a press belt of the invention perpendicular to the plane of the belt, and also perpendicular to the circumferential direction.
Fig. 4 is a view from above on the roll of Fig. 2 showing stips being deposited on the roll.
DETAILED DESCRIPTION OF THE INVENTION
The apparatus for producing a press belt as shown in Fig. 1 comprises a roll unit which has a first rotatable roll 1 followed by a second rotatable roll 2.
An endless flexible support belt 3 is wrapped around the two rolls 1 and 2. A coating device and a strip laying device are associated with the upper course of the support belt 3.
The coating device includes a pouring nozzle 4 for liquified elastomeric material. The fabric strip laying device comprises a plurality of strip supply spools 5, 6 and 7 for supplying reinforcing fabric strips. The strip spools 5 - 7 are arranged at different positions. The spools are uniformly distributed over the width of the support belt 3. They are also shown sequenced along the circumferential direction, although that aspect of their arrangment is not required. The spools for forming a layer of strips are spaced apart across the width of the belt 3 so as to each be able to lay down a respective continuous strip that is next to but spaced away from the side of the neighboring strips from the other neighboring spools, which produces the separation between neighboring strips in each layer of strips as shown in the cross-section of the press belt in Fig. 3. In Fig. 3, the strips in each layer are shown spaced a short distance apart. The strips in a layer may alternately be abutting as shown in Fig. 4.
Although three spools are shown in Fig. 1, their number is dependent on the width of each strip, the spacing between neighboring strips and the width of the belt 3. It is also possible to have a respective set of strip spools for each layer of strips at the support belt 3, with the spools for one layer being laterally offset from the respective spools for the other layer by the distance enabling the strips of each layer to extend along the gaps between the strips of the other layer.
Still liquid form polyurethane, which forms a first layer 8 of a coating composition, emerges from the nozzle 4 onto the belt 3. Upon the rotation of the support belt 3, the layer 8 moves along the belt. The strips from the strip spools or laying devices 5 to 7 are embedded into the coating composition in a slightly spaced apart array across the coating layer, as shown in Fig. 3, or essentially abutting, as shown in Fig. 4. As the belt 3 moves, the spools 5 to 7 gradually translate across the belt 3, creating an array of strips whose directions are slightly incined from the length or circumferential direction of the belt 3. A second layer of liquid polyurethane is then laid down and to it is supplied a second row of strips, building up the multiple layer press belt. The spools for the subsequent layer of strips are offset so as to cause the later applied strips to overlie the gaps between or the abutting edges of the earlier applied strips. After the press belt has been formed on the support belt 3, the formed press belt is removed from the support belt.
The device shown in Fig. 2 uses only a single roll 10. The roll is preferably of steel. The outer surface of the roll 10 is ground. Before starting the press belt forming work with this device, the outer surface of the roll 10 is treated with a parting agent, for instance, silicone oil. The other devices, of this embodiment namely the coating application and strip laying devices, are fundamentally the same as in the embodiment of Fig. 1.
The press blanket as shown in Fig. 3 is produced by the following steps using either device of Figs. 1 and 2 disclosed above.
1. The support belt is moved.
2. A first thin layer of polyurethane is poured onto the belt 3 or the steel roll 10, without an included reinforcement in the layer.
3. A second thin layer of polyurethane is poured on, with simultaneous wrapping of a layer comprising a plurality of fabric belts having the width of the nozzle advance (i.e., half the width of the nozzle). As the polyurethane is being poured and the strips are being laid, the spools 5-7 are translating slowly across the belt 3, giving the strips their incline to the direction of movement of the belt 3.
4. A somewhat thicker third polyurethane layer is poured on the second polyurethane layer, again with simultaneous wrapping of a further layer comprising a plurality of fabric strips, also having the same width as the first layer of strips and the same spacing between neighboring strips in the layer, if any. The strips of the further layer are displaced laterally to the side by half the width direction advance with respect to the lower layer, so that each of the spaced apart strips of the upper strip layer is respectively always wound over a gap between of at least over the neighboring edges of two spaced apart strips of the lower fabric strip layer.
Furthermore, because both fabric strip layers are laid by the same laying mechanism, their inclination angle is the same for both strip layers.
The wrapping of the fabric belt is effected directly after the application of the polyurethane, and while the polyurethane is still in its fluid condition.
The fabric belt must be of suitably large mesh so that the polyurethane penetrates the fabric well and still flows over the belt. The application of the three layers of polyurethane using three different nozzles which are connected one behind the other a distance apart corresponding to the pot life of the material is possible. Then the fabric strips in the two layers thereof can be laid sequentially during a single pass of the support belt 3 or the roll 10, as suggested in Fig.
4. This would be an economical way of producing the press belt. Tests, however, have shown good attachment of the polyurethane used at the present time in the event of applications made within an hour, so that the layers can also be poured one after the other.
In this case, the coating process could also operate with two nozzles. The first nozzle acts in advance and pours an unreinforced layer while the second nozzle pours the layer which is provided with the fabric belt. Upon return travel of the support, the second nozzle then proceeds in advance, whereby the fabric belt is then wound up again staggered by half the advance.
The first nozzle then pours another smooth layer on top.
This method would have the advantage that even fabric of narrower mesh which is not so readily penetrated by polyurethane could be used.
20688Q~
By placing the first polyurethane layer aside, a base layer for a press roll could also be produced by this method. For this purpose, the fabric belts could be wrapped under a certain initial tension.
Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.
The angle of inclination of the strips need only be a few degrees, typically in the order of 50. The strips are generally aligned with one another at a CQmmOn angle of inclination although differences in the order of 0.20 to 20 deviation from the angle of inclination may be tolerated.
Furthermore, because both fabric strip layers are laid by the same laying mechanism, their inclination angle is the same for both strip layers.
The wrapping of the fabric belt is effected directly after the application of the polyurethane, and while the polyurethane is still in its fluid condition.
The fabric belt must be of suitably large mesh so that the polyurethane penetrates the fabric well and still flows over the belt. The application of the three layers of polyurethane using three different nozzles which are connected one behind the other a distance apart corresponding to the pot life of the material is possible. Then the fabric strips in the two layers thereof can be laid sequentially during a single pass of the support belt 3 or the roll 10, as suggested in Fig.
4. This would be an economical way of producing the press belt. Tests, however, have shown good attachment of the polyurethane used at the present time in the event of applications made within an hour, so that the layers can also be poured one after the other.
In this case, the coating process could also operate with two nozzles. The first nozzle acts in advance and pours an unreinforced layer while the second nozzle pours the layer which is provided with the fabric belt. Upon return travel of the support, the second nozzle then proceeds in advance, whereby the fabric belt is then wound up again staggered by half the advance.
The first nozzle then pours another smooth layer on top.
This method would have the advantage that even fabric of narrower mesh which is not so readily penetrated by polyurethane could be used.
20688Q~
By placing the first polyurethane layer aside, a base layer for a press roll could also be produced by this method. For this purpose, the fabric belts could be wrapped under a certain initial tension.
Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.
The angle of inclination of the strips need only be a few degrees, typically in the order of 50. The strips are generally aligned with one another at a CQmmOn angle of inclination although differences in the order of 0.20 to 20 deviation from the angle of inclination may be tolerated.
Claims (18)
1. A stretch resistant, liquid impervious flexible press belt comprising at least one coating of elastomeric material having two layers of elongated strips therein, one layer of strips being above the other, each layer of strips comprising a plurality of the strips extending along the length of the belt and the strips in each layer being arrayed one after the other in the direction across the belt;
the strips of the two layers being oriented to extend generally along and at approximately the same angle of inclination to the circumferential direction of the press belt;
the strips of the two layers being so placed across the belt and being of such width that the strips of one layer are arranged over the edges of neighboring strips of the other layer.
the strips of the two layers being oriented to extend generally along and at approximately the same angle of inclination to the circumferential direction of the press belt;
the strips of the two layers being so placed across the belt and being of such width that the strips of one layer are arranged over the edges of neighboring strips of the other layer.
2. The press belt of claim 1, wherein the angle of inclination of all of the strips with respect to the circumferential direction of the belt is within the range of between 0.2° and 2°.
3. The press belt of claim 2, wherein the angle of inclination is about 5°.
4. The press belt of claim 1, wherein the angle of inclination is about 5°.
5. The press belt of claim 1, further comprising a second coating of elastomeric composition without the strips and positioned above the first mentioned coating of elastomeric composition.
6. The press belt of claim 1, wherein each strip comprises an open mesh.
7. The press belt of claim 6, wherein the coating composition is polyurethane.
8. The press belt of claim 1, wherein the coating composition is polyurethane.
9. The press belt of claim 1, wherein the strips in each layer are separated from the neighboring strips in that layer by a gap and the strips in each layer are arranged over the gaps between the spaced apart strips of the other layer.
10. The press belt of claim 1, wherein the edges of the strips in each layer are essentially abutting the edges of the neighboring strips in that layer.
11. A method of producing a stretch resistant, liquid impervious flexible press belt comprising applying a first layer of a coating composition to and along a support on which the belt is to be formed;
simultaneously wrapping a second fabric belt layer in the first layer of coating composition, the second layer comprising a first plurality of strips extending along the belt length, and the second layer strips being applied in a first array across the first layer;
applying a third layer of the coating composition to the first layer thereof;
simultaneously wrapping a fourth fabric belt layer in the third layer of coating composition, the fourth layer comprising a second plurality of strips extending along the belt length, and the fourth layer strips being applied in a second array across the third layer; the second strips of the fourth layer being applied at locations across the third layer that the second strips cover the neighboring edges of nighboring first strips and the first strips cover neighboring edgs of neighboring second stips;
applying the strips of both the second and fourth layers at an orientation inclined to the circumferential direction of the belt and at the same angle of incline for both of the first and second strips.
simultaneously wrapping a second fabric belt layer in the first layer of coating composition, the second layer comprising a first plurality of strips extending along the belt length, and the second layer strips being applied in a first array across the first layer;
applying a third layer of the coating composition to the first layer thereof;
simultaneously wrapping a fourth fabric belt layer in the third layer of coating composition, the fourth layer comprising a second plurality of strips extending along the belt length, and the fourth layer strips being applied in a second array across the third layer; the second strips of the fourth layer being applied at locations across the third layer that the second strips cover the neighboring edges of nighboring first strips and the first strips cover neighboring edgs of neighboring second stips;
applying the strips of both the second and fourth layers at an orientation inclined to the circumferential direction of the belt and at the same angle of incline for both of the first and second strips.
12. The method of claim 11, wherein the second layer of strips are applied spaced apart across the belt defining first gaps across the first layer for between the strips of the second layer, and the fourth layer strips are also applied spaced apart across the belt defining second gaps across the third layer between the strips of the fourth layer; the strips being laid so that the strips in each layer extend over and along a gap between two strips of the other layer.
13. The method of claim 11, wherein the second and the fourth layer strips are each laid so that the edges of neighboring strips are essentially abutting.
14. The method of claim 11, further comprising providing a fifth layer of the coating composition without the strips therein to which one of the first and third layers is applied.
15. The method of claim 11, further comprising first applying a fifth layer of the coating composition without the strips therein to the support before application of the first layer which is then applied to the fifth layer.
16. Apparatus for forming a stretch resistant, liquid impervious flexible press belt comprising:
a moving support for forming the belt on it; a nozzle for dispensing a coating of elastomeric material on the moving support;
a plurality of spools each for dispensing a strip of a fabric, the nozzles being spaced apart across the support and being movable across the support as the support moves for affording an angle of inclinations to the strips with reference to the direction of movement of the support.
a moving support for forming the belt on it; a nozzle for dispensing a coating of elastomeric material on the moving support;
a plurality of spools each for dispensing a strip of a fabric, the nozzles being spaced apart across the support and being movable across the support as the support moves for affording an angle of inclinations to the strips with reference to the direction of movement of the support.
17. The apparatus of claim 16, wherein the support comprises spaced apart rotatable rolls and a supporting belt wrapping over the rolls and the press belt being formed on the supporting belt.
18. The apparatus of claim 16, wherein the support comprises a roll on which the coating is deposited.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914115816 DE4115816A1 (en) | 1991-05-15 | 1991-05-15 | 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 |
| DEP4115816.4 | 1991-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2068800A1 true CA2068800A1 (en) | 1992-11-16 |
Family
ID=6431689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2068800 Abandoned CA2068800A1 (en) | 1991-05-15 | 1992-05-15 | Method and apparatus for the production of press belts, particularly for paper machines, as well as press belts produced thereby |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH05156587A (en) |
| CA (1) | CA2068800A1 (en) |
| DE (1) | DE4115816A1 (en) |
| FI (1) | FI921843A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5837080A (en) * | 1995-09-07 | 1998-11-17 | Albany International Corp. | Method for manufacturing a belt for a long nip press |
| US6124015A (en) * | 1996-04-18 | 2000-09-26 | Jwi Ltd. | Multi-ply industrial fabric having integral jointing structures |
| US6325897B1 (en) * | 1999-10-25 | 2001-12-04 | Ichikawa Co., Ltd. | Shoe press belt with chemically bonded inner oil layer |
| US6440274B1 (en) * | 1999-10-22 | 2002-08-27 | Ichikawa Co., Ltd. | Shoe press belt and manufacturing method |
| US7374640B2 (en) | 2003-05-23 | 2008-05-20 | Albany International Corp. | Grooved surface belt or roll and method of fabrication |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0659934A3 (en) | 1993-12-14 | 1995-09-06 | Appleton Mills | Press belt or sleeve, incorporating an open base carrier for use in long nip presses, and method of making same. |
| DE19650335A1 (en) * | 1996-12-04 | 1998-06-10 | Voith Sulzer Papiermasch Gmbh | Paper-making machine press mantle |
| DE19900989A1 (en) | 1999-01-13 | 2000-07-27 | Voith Sulzer Papiertech Patent | Belt for machines for the production of material webs |
| DE10156146A1 (en) * | 2001-11-15 | 2003-05-28 | Voith Paper Patent Gmbh | roll shell |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| DE3827486A1 (en) * | 1988-08-12 | 1990-02-15 | Oberdorfer Fa F | Process and apparatus for producing extensibly stable, liquid-impermeable, flexible pressing belts, in particular for wet presses of paper machines |
| DE3909935C2 (en) * | 1989-03-25 | 1995-04-27 | Oberdorfer F Siebtech Gmbh | Method and device for producing an impermeable and flexible band or hose |
-
1991
- 1991-05-15 DE DE19914115816 patent/DE4115816A1/en active Granted
-
1992
- 1992-04-24 FI FI921843A patent/FI921843A/en not_active Application Discontinuation
- 1992-05-14 JP JP14678392A patent/JPH05156587A/en active Pending
- 1992-05-15 CA CA 2068800 patent/CA2068800A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5837080A (en) * | 1995-09-07 | 1998-11-17 | Albany International Corp. | Method for manufacturing a belt for a long nip press |
| US6124015A (en) * | 1996-04-18 | 2000-09-26 | Jwi Ltd. | Multi-ply industrial fabric having integral jointing structures |
| US6440274B1 (en) * | 1999-10-22 | 2002-08-27 | Ichikawa Co., Ltd. | Shoe press belt and manufacturing method |
| US6325897B1 (en) * | 1999-10-25 | 2001-12-04 | Ichikawa Co., Ltd. | Shoe press belt with chemically bonded inner oil layer |
| US7374640B2 (en) | 2003-05-23 | 2008-05-20 | Albany International Corp. | Grooved surface belt or roll and method of fabrication |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4115816A1 (en) | 1992-11-19 |
| FI921843A0 (en) | 1992-04-24 |
| DE4115816C2 (en) | 1993-04-15 |
| FI921843A (en) | 1992-11-16 |
| JPH05156587A (en) | 1993-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |