CA1048323A - Wet press felt - Google Patents
Wet press feltInfo
- Publication number
- CA1048323A CA1048323A CA77271149A CA271149A CA1048323A CA 1048323 A CA1048323 A CA 1048323A CA 77271149 A CA77271149 A CA 77271149A CA 271149 A CA271149 A CA 271149A CA 1048323 A CA1048323 A CA 1048323A
- Authority
- CA
- Canada
- Prior art keywords
- fabric
- press
- accordance
- covering material
- backside
- 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
Abstract
WET PRESS PELT
Abstract of the Disclosure A press fabric which is provided with a relatively incompressible backside and grooved to present generally parallel flow channels in a press nip in a papermaking machine.
Abstract of the Disclosure A press fabric which is provided with a relatively incompressible backside and grooved to present generally parallel flow channels in a press nip in a papermaking machine.
Description
13~
g~________the Invention In the papermaking process water is frequently effectively removed from the paper sheet by pressing as the sheet and felt upon which it is being transported are squeezed between rolls in the press section. In this procedure the water has been moved out of the sheet through the felt and in some designs through holes in rolls of the press nip or through grooves formed in the rolls~ A more recent technique is shown in United States Patent 3,613,258 issued October 19, 1971 wherein a plurality of monofiLaments are adhered to the backside of the press fabric to provide a plurality of water conveying channels into which water expressed from a paper sheet located on the face of the fabric is directed for removal.
Summary of the Invention A press fabric for use in a papermaking machine for transporting paper sheet for pressing in the nip of press rolls comprising a fabric which is needled, woven or nonwoven or a comb.ination thereof to provide a water permeable structure :::
which is provided with relatively incompressible backside portion and substantially parallel grooves running in the direction of the fabric travel in the papermaking machine are formed therein.
Description of the Drawinqs ~::
Fig. 1 is a perspective view of a papermakers felt, Fig. 2 is a transverse segmentary view of the felt '~
of Fig. 1 taken along the line 2-2 in the direction of the arrows in Fig. 1 showing for illustrative purposes a papermakers felt having a woven base with web needled into the upper surface .
and backside thereof to provide a fabric for use in connection with the invention disclosed herein, -1- ~7~'~ ' 3~3 Figs. 3 and ~ are segmentary transverse views of the fabric of Fig. 2 modified in acccrdance with one embodi-ment of this invention to show in Fig. 3, the backside of the fabric treated to make it relatively incompressible and in Fig. 4 grooves formed therein, Figs. 5 and 6 are segmentary transverse views of the fabric of Fig. 2 modified in accordance with one embodi-ment of this invention to show in Fig. 5, the backside of the fabric treated and coated to make it relatively incompress-ible and in Fig. 6 grooves formed therein, and~ ;~
Figs. 7 and 8 are segmentary transverse views of thefabric of Fig. 2 modified in accordance with one embodiment of this invention to show in Fig. 7, the backside of the fabric coated to make it relatively incompressible and in Fig. 8 grooves formed therein.
Description of the Preferred Embodiment .:
In the drawing in Figs. 1 and 2 the numeral 10 designates a papermakers felt having a woven base 12 with web 14 needled into the upper surface and backside thereof to provide a fabric for use in connection with the several embodiments of the invention disclosed herein. This fabric is shown by way of example only, and other sùitable fabrics ;
of woven or nonwoven structures or combinations thereof can be used in the practice of this invention. The fabric can be woven, a woven substrate with needled web, totally needled, or any other form, such as knitting for e~ample.
The fabric is selected in order to provide the usual desired characteristics of a press felt and the construction and materials, including the type of yarns u-tilized when a woven substrate is present are so selected. Thus in selecting felt construction and materials for use in this invention the ~ ~
'`.,,~ ~' ''-:
g~________the Invention In the papermaking process water is frequently effectively removed from the paper sheet by pressing as the sheet and felt upon which it is being transported are squeezed between rolls in the press section. In this procedure the water has been moved out of the sheet through the felt and in some designs through holes in rolls of the press nip or through grooves formed in the rolls~ A more recent technique is shown in United States Patent 3,613,258 issued October 19, 1971 wherein a plurality of monofiLaments are adhered to the backside of the press fabric to provide a plurality of water conveying channels into which water expressed from a paper sheet located on the face of the fabric is directed for removal.
Summary of the Invention A press fabric for use in a papermaking machine for transporting paper sheet for pressing in the nip of press rolls comprising a fabric which is needled, woven or nonwoven or a comb.ination thereof to provide a water permeable structure :::
which is provided with relatively incompressible backside portion and substantially parallel grooves running in the direction of the fabric travel in the papermaking machine are formed therein.
Description of the Drawinqs ~::
Fig. 1 is a perspective view of a papermakers felt, Fig. 2 is a transverse segmentary view of the felt '~
of Fig. 1 taken along the line 2-2 in the direction of the arrows in Fig. 1 showing for illustrative purposes a papermakers felt having a woven base with web needled into the upper surface .
and backside thereof to provide a fabric for use in connection with the invention disclosed herein, -1- ~7~'~ ' 3~3 Figs. 3 and ~ are segmentary transverse views of the fabric of Fig. 2 modified in acccrdance with one embodi-ment of this invention to show in Fig. 3, the backside of the fabric treated to make it relatively incompressible and in Fig. 4 grooves formed therein, Figs. 5 and 6 are segmentary transverse views of the fabric of Fig. 2 modified in accordance with one embodi-ment of this invention to show in Fig. 5, the backside of the fabric treated and coated to make it relatively incompress-ible and in Fig. 6 grooves formed therein, and~ ;~
Figs. 7 and 8 are segmentary transverse views of thefabric of Fig. 2 modified in accordance with one embodiment of this invention to show in Fig. 7, the backside of the fabric coated to make it relatively incompressible and in Fig. 8 grooves formed therein.
Description of the Preferred Embodiment .:
In the drawing in Figs. 1 and 2 the numeral 10 designates a papermakers felt having a woven base 12 with web 14 needled into the upper surface and backside thereof to provide a fabric for use in connection with the several embodiments of the invention disclosed herein. This fabric is shown by way of example only, and other sùitable fabrics ;
of woven or nonwoven structures or combinations thereof can be used in the practice of this invention. The fabric can be woven, a woven substrate with needled web, totally needled, or any other form, such as knitting for e~ample.
The fabric is selected in order to provide the usual desired characteristics of a press felt and the construction and materials, including the type of yarns u-tilized when a woven substrate is present are so selected. Thus in selecting felt construction and materials for use in this invention the ~ ~
'`.,,~ ~' ''-:
-2~
3~3 usual major desirable properties of a press felt must be considered. The felt must be selected insofar as it is possible to provide uniform pressure distribution in the nip, low fluid flow resistance in the nip and minimum rewetting of the paper web from the felt.
In Figs. 3 and 4 one embodiment of the invention is shown in which the numeral 12 designates a woven substrate and 16 designates the web on the under side of the fabric which has been treated to render it relatively incompressible.
It is in this treated web that the longitudinal grooves 18 are provided as shown in Fig. 4.
The fabric can be wholly or partially treated for the purpose of providing a relatively incompressible portion on the backside of the structure. Treatments may be such as a urethane resin which does not significantly decrease fabric air or water permeability. Any other suitable treatment may ;~
be utilized. Treatments are applied by a kiss roll applicator, ~reating fountain or slot, or any other means to obtain the desired distribution in the -Eabric. Treatment distribution and deposition may be any amount to obtain desired fabric properties and can be on the upper surface of the fabric as well as the backside. Treatment concentrations may be any desired concentration. The fabric is then dried and/or cured by some means such as air drying or air curing.
The fabric back is then grooved by some means, such as a bank of circular saw blades or fluid jets. Groove geometry is determined by grooving means. Groove spacing and dimensions are set over any desired range of dimension.
To groove the full width of a wide fabric, a grooving apparatus narrower than the fabric may be used. The first groove set is made along the Eull length of the press felt in 3~
one area' the next ~roove sets are made ln a similar manner, using -the initial groove set as a guide or reference.
As shown in Figs. 3 and 4 where an example is provided having a fabric w~nich in turn has a woven base the grooves 1~ would normally not be cut deep enough to reach it.
Thus there is provided a press fabric in which the restriction of water flow in the papermakers press nip is reduced to provide increased sheet dryness and a cleaner press felt by virtue of increased water flow.
In Figs. 5 and 6 another embodiment of the invention is shown in which the numexal 16' designates the treated web ~-of Fig. 3 with a coating 20 that has been applied to the under side or backside thereof. The coating material can be plastisol, for example, which is applied by conventional means. The coat-ing is dried and cured by conventional means and the fabric back is grooved to provide grooves 18' by suitable means such as a bank of circular saw blades or fluid jets. Groove geometry is determined by grooving means. Groove spacing and depth are set over any desired range of dimensions. The fabric construct-ion and materials as in the embodiment oE Figs. 3 and 4 can be varied and selected in the same way as the fabric construction and materials of the first embodiment - namely - to provide the ~ -~
usual desired press fabric properties.
Thus there is provided a press Eabric in which the restriction of water flow in the papermakers press nip is reduced to provide increased sheet dryness and a cleaner press felt by virtue of increased water flow.
In Figs. 7 and 8 still another embodiment of the invention is shown in which the numeral 20' designates the coating of the em~odiment shown in Figs. 5 and 6 applied . .
,. , , .,.,.~, , :,:
,. . . . . . .
:::
directly to the web 14 on the backside of the felt 10. This embodiment differs from that shown in Figs. 5 and 6 in that in the embodiment of Figs. 7 and 8, the web 14 on the under side of the felt 10 has not been treated. The coating material can be any suitable material such as the plastisol previously mentioned and can be applied by conventional means with con-ventional drying and curing. The fabric back is grooved in any suitable manner such as described above to provide grooves -18".
The embodiment of Figs. 7 and 8 there-fore also provides an improved press fabric in which the restriction to water flow in the nip of press rolls in a papermaking machine is reduced to provide increased sheet dryness and a cleaner press felt by virtue of increased water flow.
In Figs. 3 and 4 one embodiment of the invention is shown in which the numeral 12 designates a woven substrate and 16 designates the web on the under side of the fabric which has been treated to render it relatively incompressible.
It is in this treated web that the longitudinal grooves 18 are provided as shown in Fig. 4.
The fabric can be wholly or partially treated for the purpose of providing a relatively incompressible portion on the backside of the structure. Treatments may be such as a urethane resin which does not significantly decrease fabric air or water permeability. Any other suitable treatment may ;~
be utilized. Treatments are applied by a kiss roll applicator, ~reating fountain or slot, or any other means to obtain the desired distribution in the -Eabric. Treatment distribution and deposition may be any amount to obtain desired fabric properties and can be on the upper surface of the fabric as well as the backside. Treatment concentrations may be any desired concentration. The fabric is then dried and/or cured by some means such as air drying or air curing.
The fabric back is then grooved by some means, such as a bank of circular saw blades or fluid jets. Groove geometry is determined by grooving means. Groove spacing and dimensions are set over any desired range of dimension.
To groove the full width of a wide fabric, a grooving apparatus narrower than the fabric may be used. The first groove set is made along the Eull length of the press felt in 3~
one area' the next ~roove sets are made ln a similar manner, using -the initial groove set as a guide or reference.
As shown in Figs. 3 and 4 where an example is provided having a fabric w~nich in turn has a woven base the grooves 1~ would normally not be cut deep enough to reach it.
Thus there is provided a press fabric in which the restriction of water flow in the papermakers press nip is reduced to provide increased sheet dryness and a cleaner press felt by virtue of increased water flow.
In Figs. 5 and 6 another embodiment of the invention is shown in which the numexal 16' designates the treated web ~-of Fig. 3 with a coating 20 that has been applied to the under side or backside thereof. The coating material can be plastisol, for example, which is applied by conventional means. The coat-ing is dried and cured by conventional means and the fabric back is grooved to provide grooves 18' by suitable means such as a bank of circular saw blades or fluid jets. Groove geometry is determined by grooving means. Groove spacing and depth are set over any desired range of dimensions. The fabric construct-ion and materials as in the embodiment oE Figs. 3 and 4 can be varied and selected in the same way as the fabric construction and materials of the first embodiment - namely - to provide the ~ -~
usual desired press fabric properties.
Thus there is provided a press Eabric in which the restriction of water flow in the papermakers press nip is reduced to provide increased sheet dryness and a cleaner press felt by virtue of increased water flow.
In Figs. 7 and 8 still another embodiment of the invention is shown in which the numeral 20' designates the coating of the em~odiment shown in Figs. 5 and 6 applied . .
,. , , .,.,.~, , :,:
,. . . . . . .
:::
directly to the web 14 on the backside of the felt 10. This embodiment differs from that shown in Figs. 5 and 6 in that in the embodiment of Figs. 7 and 8, the web 14 on the under side of the felt 10 has not been treated. The coating material can be any suitable material such as the plastisol previously mentioned and can be applied by conventional means with con-ventional drying and curing. The fabric back is grooved in any suitable manner such as described above to provide grooves -18".
The embodiment of Figs. 7 and 8 there-fore also provides an improved press fabric in which the restriction to water flow in the nip of press rolls in a papermaking machine is reduced to provide increased sheet dryness and a cleaner press felt by virtue of increased water flow.
Claims (14)
1. A papermakers press-fabric of a papermaking machine for transporting paper sheet for pressing in the nip of press rolls comprising a water permeable endless fabric, an upper surface thereof for receiving in contact therewith the paper sheet to be transported, a backside thereof, a relatively incompressible covering material in firm mechanical engagement with at least a portion of said backside and grooves formed in said covering material to provide water conveying channels into which water expressed from a paper sheet located on the upper surface thereof is directed for removal upon pressing in said nip.
2. A press fabric in accordance with claim 1 in which the covering material is a cured resin treatment.
3. A press fabric in accordance with claim 2 in which the resin treatment is a urethane.
4. A press fabric in accordance with claim 1 in which the covering material is a cured resin treatment with a coating applied thereover.
5. A press fabric in accordance with claim 4 in which the coating is a plastisol.
6. A press fabric in accordance with claim 4 in which the resin treatment is a urethane.
7. A press fabric in accordance with claim 1 in which the covering material is a coating.
8. A press fabric in accordance with claim 7 in which the coating is a plastisol.
9. A press fabric in accordance with claim 1 in which the grooves are substantially parallel.
10. A press fabric in accordance with claim 1 in which the grooves are substantially parallel and run in the direction of press fabric travel in the papermaking machine.
11. The method of producing a papermakers press-fabric for transporting paper sheet for pressing in the nip of press rolls including the steps of selecting a fabric which is highly water permeable, firmly engaging a relatively in-compressible covering material on at least a portion of the backside of the fabric and forming grooves in the covering material to provide water conveying channels.
12. The method of producing a press fabric in accordance with claim 11 in which the covering material is provided by applying a treatment to the backside thereof and then drying and curing.
13. The method of producing a press fabric in accordance with claim 11 in which the covering material is provided by applying a treatment of the backside thereof and then drying and curing and then applying a coating thereover of a plastisol.
14. The method of producing a press fabric in accordance with claim 11 in which the covering material is provided by coating the backside thereof with a plastisol and then drying and curing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US66246176A | 1976-03-01 | 1976-03-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1048323A true CA1048323A (en) | 1979-02-13 |
Family
ID=24657807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA77271149A Expired CA1048323A (en) | 1976-03-01 | 1977-02-07 | Wet press felt |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1048323A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5152874A (en) * | 1989-09-06 | 1992-10-06 | Beloit Corporation | Apparatus and method for removing fluid from a fibrous web |
| US5238537A (en) * | 1981-09-15 | 1993-08-24 | Dutt William H | Extended nip press belt having an interwoven base fabric and an impervious impregnant |
| CN108797185A (en) * | 2018-06-28 | 2018-11-13 | 河南省双龙网毯有限公司 | High speed paper machine felt production technology |
-
1977
- 1977-02-07 CA CA77271149A patent/CA1048323A/en not_active Expired
Cited By (3)
| 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 |
| US5152874A (en) * | 1989-09-06 | 1992-10-06 | Beloit Corporation | Apparatus and method for removing fluid from a fibrous web |
| CN108797185A (en) * | 2018-06-28 | 2018-11-13 | 河南省双龙网毯有限公司 | High speed paper machine felt production technology |
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