EP1549800A1 - Pressfilz und basisgewebe - Google Patents
Pressfilz und basisgewebeInfo
- Publication number
- EP1549800A1 EP1549800A1 EP03798206A EP03798206A EP1549800A1 EP 1549800 A1 EP1549800 A1 EP 1549800A1 EP 03798206 A EP03798206 A EP 03798206A EP 03798206 A EP03798206 A EP 03798206A EP 1549800 A1 EP1549800 A1 EP 1549800A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- yarns
- seam
- base fabric
- longitudinal
- transverse
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/10—Seams thereof
Definitions
- the invention relates to a press felt comprising: at least one base fabric, which includes a bottom side and a side facing the web to be dried and several longitudinal yarns and transverse yarns and where at least some of the longitudinal yarns are arranged to form several seam loops at a first transverse joining edge of the press felt and at a second transverse joining edge, the joining edges of the base fabric being arrangeable edge on edge to form a seam, where the seam loops of the first joining edge and the second joining edge intermesh and form a seam loop channel, into which a seam yarn connecting the joining edges can be inserted; a seam flap, which is arranged to cover the seam on the press felt surface facing the web, and at least one batt fibre layer arranged at least on the base fabric surface facing the web.
- the invention further relates to a base fabric intended for a press felt, the base fabric consisting of a base side and a web side and comprising: several longitudinal yarns arranged to form seam loops at a first and a second transverse edge of the base fabric; and several transverse yarns arranged to attach to the longitudinal yarns.
- the press section of the paper machine employs a press felt on one or both sides of the web to be dried, into which the water in the web is absorbed in the pressing phase.
- the purpose is to transport the water away in the structure of the press felt without letting it back into the web.
- the press felt comprises a base fabric which, for example, provides the felt with a necessary space for water.
- batt fibre is needled at least onto a base fabric surface facing the paper web, the batt fibre preventing markings from being produced on the web.
- the water retention capacity of the felt can be adjusted by means of the batt fibre.
- the transverse edges of such felts comprise seam loops. It is not until in the paper machine that the felt is connected into a closed loop by intermeshing the seam loops on the opposite edges and inserting a seam yarn into a seam loop channel thus formed.
- a problem associated with felts provided with seams is that the seam loops form a discontinuity in the felt base fabric where the felt thickness is different, which causes markings on the web.
- the yarn density differs from that in the rest of the structure, in which case the felt permeability is different at the seam. The difference in permeability may also cause markings on the web.
- adherence of the batt fi- bre may also pose a problem.
- the object of the invention is to provide a novel and improved press felt and base fabric for a press felt.
- the press felt according to the invention is characterized in that the base fabric has at least a three-layer structure which comprises, in addition to the longitudinal yarns forming seam loops, at least one layer of longitudinal surface yarns on the web-side surface of the base fabric, the yarns being arranged to attach to at least some of the transverse yarns, that the longitudinal surface yarns are arranged to continuously extend over the seam when the base fabric is manufactured, that several additional transverse yarns are provided at the seam, the yarns being attached at least to the longitudinal surface yarns, and that the longitudinal surface yarns have been cut after the attachment of batt fibre to form a seam flap.
- the base fabric according to the invention is characterized in that in addition to the longitudinal yarns forming seam loops, there is at least one layer of longitudinal surface yarns on the web-side surface of the base fabric, that the longitudinal surface yarns are attached to at least some of the transverse yarns, that the longitudinal surface yarns extend continuously over a seam formed by seam loops on the first and the second edge, and that the area where the seam is to be formed is provided with several additional transverse yarns, which are attached at least to the longitudinal surface yarns.
- the invention is based on the idea that the web-side surface of the base fabric is provided with at least one layer of longitudinal yarns, which are attached to the transverse yarns of the base fabric and further ar- ranged to extend over the seam when the base fabric is manufactured. Furthermore, additional transverse yarns excessive to the rest of the structure are brought to the seam area during manufacture. These yarns join at least the surface yarns that travel over the seam. After the base fabric has been formed, one or more batt fibre layers are attached at least to its web-side surface. It is not until after this that the longitudinal surface yarns travelling over the seam are cut, whereby a seam flap which protects the seam is formed.
- An advantage of the invention is that the seam flap protects the seam from mechanical wear. Furthermore, since the seam flap comprises both longitudinal and transverse yarns, its structure is durable and firm. The number and quality of longitudinal surface yarns as well as those of the additional transverse yarns can be easily varied to obtain a desirable base fabric without having to substantially alter the structure of the basic weave. A further advantage is that batt fibre can be attached well to the seam area since the seam flap comprises both transverse and longitudinal yarns. Thus the permeability and thickness may be substantially the same at the seam as in the other press felt sections.
- the length of the seam flap can be implemented such that stretching of the seam loops during use is com- pensated for and the seam flap always provides sufficient protection for the seam.
- An embodiment of the invention is based on the idea that the longitudinal yarns to be extended over the seam on the base fabric surface differ from the monofilaments that form seam loops in the base fabric.
- plied yarns can be used as longitudinal surface yarns. Thanks to the structure according to the invention, the longitudinal surface yarns can be selected so as to obtain a good surface smoothness and batt fibre adherence.
- An embodiment of the invention is based on the idea that the additional transverse yarns in the seam flap are attached to the longitudinal surface yarns by weaving.
- An embodiment of the invention is based on the idea that the additional longitudinal yarns and longitudinal surface yarns are attached to one another by weaving, and after weaving, the attachment of the yarns is secured by melting or welding the yarns into one another. The result is a very firm and durable seam flap.
- An embodiment of the invention is based on the idea that the additional transverse yarns attach only to the longitudinal yarns that travel over the seam.
- the basic idea of an embodiment according to the invention is that the longitudinal yarns in the base fabric do not cross one another.
- the longitudinal surface yarns form a layer which is independent of the rest of the structure and whose yarns can be selected relatively freely.
- the longitudinal surface yarns do not cross the yarns forming seam loops, they do not take room between adjacent seam loops.
- the longitudinal surface yarns have no effect on the density of the seam loops, and thus the loop density can be selected according to the need.
- An embodiment of the invention is based on the idea that the seam flap area is provided with a special reinforced layer, such as a layer made of resin or adhesive which reinforces the structure of the seam flap.
- Figure 1 is a schematic perspective view of a press felt according to the invention which is provided with a seam and connected into a closed loop
- Figure 2 schematically illustrates the structure of an edge of a press felt according to the invention seen in the direction of transverse yarns
- Figure 3 schematically illustrates the structure of a base fabric according to the invention seen in the direction of transverse yarns
- FIG. 4 schematically illustrates a method of manufacturing a base fabric according to the invention.
- FIG. 1 It appears from Figure 1 how the press felt can be formed into a closed loop by connecting the joining edges at its transverse edges to- gether by a seam 1.
- the press felt may also consist of several press felt pieces joined together, in which case there are naturally several seams.
- the press felt is run on the paper machine in the machine direction A marked in the figure.
- the width of the press felt corresponds to that of the paper machine.
- Figure 2 illustrates a transverse B joining edge of a press felt according to the invention. For the sake of clarity, the figure illustrates only a few of the transverse yarns.
- the base fabric of the press felt shown in the figure has been manufactured by weaving longitudinal yarns and transverse yarns together using a suitable weave.
- the structure comprises at least three layers, i.e. it contains three superimposed longitudinal yarns.
- the longitudinal yam 2 on the bottom side C of the press felt and the longitudinal yarn 3 in the middle form a seam loop 4 at the joining edge.
- all yarns 2 and 3 at the bottom and in the middle form seam loops but in some cases some of the longitudinal yarns may not form seam loops.
- the longitudinal yarns 2 and 3 at the bottom and in the middle bind to transverse yarns 5.
- the longitudinal surface yarn 6 clearly extends further than the seam loops in direction A in the embodiment shown in Figure 2.
- the longitudinal surface yarns 6 may be cut approxi- mately at the seam loops.
- the seam 1 area is provided with a sufficient number of additional transverse yarns 7, which attach to the longitudinal surface yarns 6.
- the materials, cross sections and yarn types of the additional yarns 7 and longitudinal surface yarns 6 can be selected independently of the rest of the base fabric structure.
- the longitudinal yarns 2 and 3 that form seam loops 4 are typically made of monofilaments but the longitudinal surface yarns 6 as well as the additional yarns 7 may also be made of plied fibre, for example. Batt fibre is much easier to attach to yarns made of plied fibre and to a weave structure formed from them.
- the longitudinal surface yarns 6 and additional yarns 7 form together a seam flap 8, which protects the seam 1.
- the seam flap 8 is a press felt part which has substantially the same width as the press felt and whose one transverse edge is attached to the rest of the press felt structure when the other transverse edge is free.
- the batt fibre is attached to the base fabric 10 by needling.
- the seam flap 8 may be provided with one or more reinforcing layers 12, which makes the seam flap firm and affects its permeability.
- the reinforcing layer 12 may be a perforated film, a resin layer, an adhesive layer or another material layer applied by spreading, spraying, injecting or by means of a roller, for example.
- the base fabric may be treated with an ultrasonic device or heated at least in the seam area, in which case the longitudinal surface yarns 6 and additional yarns 7 join one another.
- a suitable material can be selected for the yarns 6 and 7 by taking the treatment in question into account.
- the yarns 6 and 7 may be 'fusible yarns', for instance.
- Figure 3 illustrates part of a base fabric 10 according to the invention.
- a seam yarn 13 which connects the joining edges together, has been inserted into the seam loop channel formed by the seam loops 4.
- the longitudinal surface yarns 6 are arranged to extend over the seam 1. A point where the longitudinal surface yarns 6 can be cut e.g.
- FIG 3 further illustrates an alternative cutting point 14', which is clearly outside the seam area 1.
- a relatively long seam flap 8 is formed in the base fabric. This flap compensates for the discontinuity caused by the seam 1 over a longer section.
- the free edge of the seam flap can be, if necessary, attached after insertion of the seam yarn by needling, stitching, melting, using an adhesive or with suitable form-locking members.
- the transverse yarn is in position 5b instead of position 5a.
- Figure 4 illustrates a method of manufacturing a base fabric
- the section of the fabric that forms seam loops 4 is woven into an endless structure using 'horseshoe weaving'.
- seam loops are formed on the upper and the lower level at the right-hand edge of the fabric.
- the figure also shows an edge yarn 15, round which the seam loops 4 are woven.
- An upper structure is simultaneously woven into a closed loop on top of the structure forming seam loops 4.
- This structure comprises longitudinal surface yarns 6 that extend over the seam and additional yarns 7.
- the base fabric 10 is trans- ferred into a needling machine, where batt fibre is attached. Then the press felt can be subjected to a thermal treatment and other necessary post-treatments. Finally, before installation in a paper machine, the longitudinal surface yarns 6 are cut and the seam is opened.
- the longitudinal surface yarns 6 can be woven into a loop with a desired length around the structure forming seam loops 4.
- a suitable filling material can be used as an aid in weaving, such as auxiliary yarns 16, by means of which the longitudinal surface yarns 6 can be guided in a weaving machine.
- This way it is possible to form a seam flap 8' with a desired length independent of the rest of the base fabric 10 structure.
- This seam flap is illustrated in the figure with a broken line
- the base fabric 10 can be formed using weave patterns other than those illustrated in the figures.
- the longitudinal surface yarns 6 can be arranged in two or more layers and they form a seam flap 8 with the additional yarns 7.
- the base fabric may be a yarn assembly.
Landscapes
- Paper (AREA)
- Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20020392U FI5693U1 (fi) | 2002-09-27 | 2002-09-27 | Puristinhuopa ja pohjakangas |
FI20020392U | 2002-09-27 | ||
PCT/FI2003/000698 WO2004029357A1 (en) | 2002-09-27 | 2003-09-25 | Press felt and base fabric |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1549800A1 true EP1549800A1 (de) | 2005-07-06 |
EP1549800B1 EP1549800B1 (de) | 2007-09-05 |
Family
ID=8563376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03798206A Expired - Lifetime EP1549800B1 (de) | 2002-09-27 | 2003-09-25 | Pressfilz und basisgewebe |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1549800B1 (de) |
AT (1) | ATE372414T1 (de) |
AU (1) | AU2003266422A1 (de) |
CA (1) | CA2498139A1 (de) |
DE (1) | DE60316167T2 (de) |
FI (1) | FI5693U1 (de) |
NO (1) | NO20052066L (de) |
WO (1) | WO2004029357A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7032625B2 (en) | 2003-06-24 | 2006-04-25 | Albany International Corp. | Multi-layer papermaking fabrics having a single or double layer weave over the seam |
EP1808527A1 (de) | 2006-01-17 | 2007-07-18 | Voith Patent GmbH | Nassfilz mit Naht und Verfahren zu dessen Herstellung |
FI124585B (fi) * | 2012-02-10 | 2014-10-31 | Valmet Fabrics Oy | Tekstiilihihna, menetelmä sen valmistamiseksi sekä käyttö |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI110135B (fi) * | 2000-12-18 | 2002-11-29 | Tamfelt Oyj Abp | Menetelmä puristinhuovan valmistamiseksi ja puristinhuopa |
-
2002
- 2002-09-27 FI FI20020392U patent/FI5693U1/fi active
-
2003
- 2003-09-25 AT AT03798206T patent/ATE372414T1/de not_active IP Right Cessation
- 2003-09-25 EP EP03798206A patent/EP1549800B1/de not_active Expired - Lifetime
- 2003-09-25 AU AU2003266422A patent/AU2003266422A1/en not_active Abandoned
- 2003-09-25 DE DE60316167T patent/DE60316167T2/de not_active Expired - Lifetime
- 2003-09-25 CA CA002498139A patent/CA2498139A1/en not_active Abandoned
- 2003-09-25 WO PCT/FI2003/000698 patent/WO2004029357A1/en active IP Right Grant
-
2005
- 2005-04-27 NO NO20052066A patent/NO20052066L/no not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2004029357A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60316167T2 (de) | 2008-06-05 |
AU2003266422A1 (en) | 2004-04-19 |
WO2004029357A1 (en) | 2004-04-08 |
NO20052066L (no) | 2005-04-27 |
CA2498139A1 (en) | 2004-04-08 |
FIU20020392U0 (fi) | 2002-09-27 |
FI5693U1 (fi) | 2003-02-13 |
ATE372414T1 (de) | 2007-09-15 |
EP1549800B1 (de) | 2007-09-05 |
DE60316167D1 (de) | 2007-10-18 |
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