EP0284575B1 - A dewatering medium for forming paper sheets - Google Patents
A dewatering medium for forming paper sheets Download PDFInfo
- Publication number
- EP0284575B1 EP0284575B1 EP88850058A EP88850058A EP0284575B1 EP 0284575 B1 EP0284575 B1 EP 0284575B1 EP 88850058 A EP88850058 A EP 88850058A EP 88850058 A EP88850058 A EP 88850058A EP 0284575 B1 EP0284575 B1 EP 0284575B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- forming
- fabric
- strands
- medium
- machine direction
- 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 - Lifetime
Links
Images
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
- D21F1/0036—Multi-layer screen-cloths
Definitions
- the subject invention concerns a multi-layer dewatering medium for forming paper sheets.
- Each layer of the medium comprises polymer material strands at least in the machine direction. These strands may consist of interwoven thread material but could also be extruded strands alone or combined with woven thread materials.
- the conventional and most common technique involves discharging an acqueous suspension of cellulose fibers onto a forming fabric which travels horizontally and in a flat condition during the forming phase proper.
- the water flows through the forming fabric and the restricted mesh size of the fabric prevents the fiber material from penetrating into and through the forming fabric.
- the fibers remain on the surface of the fabric, evenly distributed thereon, whereas the dewatering elements, such as suction boxes and foils, facilitate the water through-flow.
- the fibers At the end of the flat, horizontal part of the forming fabric loop the fibers have formed a continuous fibrous web.
- This type of forming is generally referred to as Fourdrinier forming.
- a jet of fibrous suspension is discharged into the gap between two moving forming elements at least one of which consists of a forming fabric.
- the water is removed by the forming elements whereas the fiber material is retained by said elements.
- This type of formation is generally referred to as twin wire forming.
- multilayer forming fabrics are generally used as the forming elements.
- the stability of multi-layer forming fabrics is largely superior to that of single-layer fabrics and particularly in Fourdrinier machines it is desirable to be able to combine a fine-mesh forming surface layer with a bottom surface layer having sufficient wearability. These properties are difficult to combine in a single-layer fabric.
- the layer closest to the material to be formed could be made from a fine-diameter thread material, resulting in a fine mesh density whereas the layer closest to the dewatering elements may be made from a coarser and thus more abrasion-resistant material.
- EP 0 046 899 discloses a double-layer forming fabric the weft layer or transverse layer of which forms the outer layer which is in contact with the dewatering elements.
- the technique of designing and constructing multi-layer fabrics has always resided in exposing the transverse weft threads on the rear face to the abrasive effects.
- the purpose of the lengthwise threads is to absorb the wire tension and for this reason these threads may be worn only to a limited degree.
- abrasion of the transverse threads may continue until close to the wear-through point of these threads before the fabric is considered to be worn out. This is the reason why all modern forming fabrics are manufactured with transverse bottom threads serving as the abrasive medium.
- Identical structures have also been used in the twin-wire forming method although in this case the abrasion is not quite so strong.
- the dewatering medium for forming paper sheets in accordance with the subject invention is of multi-layer type and consists of strands of polymeric material, which medium has on its one side a first surface constituting the forming surface of the medium, which surface in position of use of the medium faces the material to be formed, and on its opposite side a second surface.
- the dewatering medium is characterized therein that at least in the machine direction the layer closest to the second surface is made up from strands, that in the machine direction continuous or discontinuous lengths (floats) of said strands abut on said second surface, that the longest ones of said lengths of strands in the machine direction are longer than discontinuous lengths (floats) of strands which are repeated in the cross-machine direction and which abut on said second face of the medium.
- Fig. 1 illustrates a twin-wire machine 11 of roll-former type.
- the fiber stock is discharged into the gap between the upper fabric 13 and the bottom fabric 14.
- the fabrics 13 and 14 with the fiber stock between them is carried over part of the cylinder face of a forming roller 15 for removal of the water through the bottom fabric 14 down into the vat 16.
- the moist paper sheet still positioned intermediate the two fabrics, is then carried to a separation roller 17.
- a bottom fabric 14 of a conventional type this system operates without problem up to a certain speed limit. At higher speeds, however, a certain amount of water accompanies the fabric up to the separation roller 17.
- the forming medium in the form of the forming fabric 30 shown in Fig. 3 consists of one system of threads 32 which extend at right angles to the direction of travel 31 of the fabric and which threads 32 abut on the first surface 33 of the fabric facing the paper web.
- a second, system of cross-machine direction threads 34 extend in parallel with the system of threads 32 and abut on the second surface 35 of the fabric.
- a third system of threads 36 extend in the machine direction 31 and at right angles to the systems of cross-machine direction threads 32 and 34, interconnecting the latter in to a weave and alternately running between the first surface 33 facing the paper web and the second surface 35 facing in the opposite direction.
- each machine-direction thread 36 extends externally across four consecutive cross-machine direction threads 34, forming discontinuous strand lengths (floats) 37 in the machine direction of the forming medium.
- Each cross-machine direction thread 34 extends externally across one or two machine-direction threads 36, forming discontinuous short strand lengths 38 and slightly longer strand lengths 39 in the cross-machine direction of the forming fabric.
- the forming fabric 40 comprises a system of cross-machine directions threads 42 which extend at right angles to the direction of travel 41 of the fabric and which system of threads abut on the first surface 43 of the fabric which faces the paper web being formed.
- a second system of cross-machine direction threads 44 extend in parallel with the first system of threads 42 and abut on the second surface 45 of the wire.
- the forming fabric also comprises two systems of threads 46 and 47 which extend in the lengthwise direction of the machine.
- the system of threads 46 faces the first surface 43 of the fabric and the system of threads 47 faces the second fabric surface 45.
- FIG. 6 illustrates the layer of threads which abut on the second surface 45 of the fabric.
- Each machine-direction thread 47 extends externally across three consecutive cross-machine direction threads 44, forming discontinuous lengths (floats) of strands 48 in the machine direction 41 of the forming fabric.
- Each cross-machine direction thread 44 extends externally across only one machine-direction thread 47, forming discontinuous strand lengths (floats) 49 in the cross-machine direction of the forming medium.
- FIG. 7 A further embodiment is illustrated in Fig. 7.
- the forming medium 50 shown in this drawing figure consists of a weave 51 comprising machine direction threads 52 and cross-machine direction threads 53 which, when interwoven, make up the first forming fabric surface 54 which faces the paper web.
- the other side of the fabric exhibits continuous strands 55 which are extruded in the machine direction and which abut on the second surface 56 of the medium.
- These continuous lengthwise strands may be interconnected by means of transversely extending interconnection strands 57.
- the invention is not limited to the embodiments which are illustrated and described herein but a number of modifications are possible within the scope of the appended claims.
- the invention is applicable to other types of dewatering media than weaves, e.g. to a structure comprising a perforated foil and underlying strands.
Landscapes
- Paper (AREA)
- Drying Of Solid Materials (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88850058T ATE64964T1 (de) | 1987-03-24 | 1988-02-22 | Entwaesserungsgewebe zur bildung einer papierbahn. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8701205A SE460125B (sv) | 1987-03-24 | 1987-03-24 | Flerlagrat avvattningsband foer formering av pappersark |
SE8701205 | 1987-03-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0284575A1 EP0284575A1 (en) | 1988-09-28 |
EP0284575B1 true EP0284575B1 (en) | 1991-07-03 |
Family
ID=20367951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88850058A Expired - Lifetime EP0284575B1 (en) | 1987-03-24 | 1988-02-22 | A dewatering medium for forming paper sheets |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0284575B1 (fi) |
JP (1) | JPS63295787A (fi) |
AT (1) | ATE64964T1 (fi) |
AU (1) | AU612138B2 (fi) |
BR (1) | BR8801159A (fi) |
CA (1) | CA1326609C (fi) |
DE (1) | DE3863453D1 (fi) |
ES (1) | ES2023015B3 (fi) |
FI (1) | FI90361C (fi) |
MX (1) | MX168766B (fi) |
NO (1) | NO168840C (fi) |
SE (1) | SE460125B (fi) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6745797B2 (en) | 2001-06-21 | 2004-06-08 | Weavexx Corporation | Papermaker's forming fabric |
US7766053B2 (en) | 2008-10-31 | 2010-08-03 | Weavexx Corporation | Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns |
US7931051B2 (en) | 2008-01-23 | 2011-04-26 | Weavexx Corporation | Multi-layer papermaker's forming fabric with long machine side MD floats |
US8251103B2 (en) | 2009-11-04 | 2012-08-28 | Weavexx Corporation | Papermaker's forming fabric with engineered drainage channels |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5360518A (en) * | 1991-12-18 | 1994-11-01 | Albany International Corp. | Press fabrics for paper machines |
US5709250A (en) * | 1994-09-16 | 1998-01-20 | Weavexx Corporation | Papermakers' forming fabric having additional fiber support yarns |
US5983953A (en) * | 1994-09-16 | 1999-11-16 | Weavexx Corporation | Paper forming progess |
US5518042A (en) * | 1994-09-16 | 1996-05-21 | Huyck Licensco, Inc. | Papermaker's forming fabric with additional cross machine direction locator and fiber supporting yarns |
US5937914A (en) * | 1997-02-20 | 1999-08-17 | Weavexx Corporation | Papermaker's fabric with auxiliary yarns |
US5967195A (en) * | 1997-08-01 | 1999-10-19 | Weavexx Corporation | Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface |
US6112774A (en) * | 1998-06-02 | 2000-09-05 | Weavexx Corporation | Double layer papermaker's forming fabric with reduced twinning. |
DE19859581A1 (de) * | 1998-12-22 | 2000-06-29 | Voith Fabrics Heidenheim Gmbh | Mehrlagiges Papiermaschinensieb zur Entwässerung und Blattbildung |
US6123116A (en) * | 1999-10-21 | 2000-09-26 | Weavexx Corporation | Low caliper mechanically stable multi-layer papermaker's fabrics with paired machine side cross machine direction yarns |
US6179013B1 (en) | 1999-10-21 | 2001-01-30 | Weavexx Corporation | Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section |
US6585006B1 (en) | 2000-02-10 | 2003-07-01 | Weavexx Corporation | Papermaker's forming fabric with companion yarns |
US6244306B1 (en) | 2000-05-26 | 2001-06-12 | Weavexx Corporation | Papermaker's forming fabric |
US6253796B1 (en) | 2000-07-28 | 2001-07-03 | Weavexx Corporation | Papermaker's forming fabric |
RU2379400C2 (ru) * | 2004-08-04 | 2010-01-20 | Олбани Интернешнл Корп. | Трехслойная ткань с основными настилами и двойной внутренней связующей нитью основы |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE533696A (fi) * | ||||
US4423755A (en) * | 1982-01-22 | 1984-01-03 | Huyck Corporation | Papermakers' fabric |
US5114777B2 (en) * | 1985-08-05 | 1997-11-18 | Wangner Systems Corp | Woven multilayer papermaking fabric having increased stability and permeability and method |
DE8522823U1 (de) * | 1985-08-08 | 1986-12-11 | Birke, Josef, 6780 Pirmasens | Brandsohlenloser Schuh |
JPS6359111A (ja) * | 1986-08-29 | 1988-03-15 | Hitachi Ltd | コンパレ−タとd/a変換器 |
-
1987
- 1987-03-24 SE SE8701205A patent/SE460125B/sv not_active IP Right Cessation
-
1988
- 1988-02-22 AT AT88850058T patent/ATE64964T1/de not_active IP Right Cessation
- 1988-02-22 DE DE8888850058T patent/DE3863453D1/de not_active Expired - Fee Related
- 1988-02-22 EP EP88850058A patent/EP0284575B1/en not_active Expired - Lifetime
- 1988-02-22 ES ES88850058T patent/ES2023015B3/es not_active Expired - Lifetime
- 1988-03-15 NO NO881141A patent/NO168840C/no not_active IP Right Cessation
- 1988-03-15 BR BR8801159A patent/BR8801159A/pt not_active IP Right Cessation
- 1988-03-18 FI FI881285A patent/FI90361C/fi not_active IP Right Cessation
- 1988-03-22 CA CA000562146A patent/CA1326609C/en not_active Expired - Fee Related
- 1988-03-23 JP JP63069216A patent/JPS63295787A/ja active Pending
- 1988-03-23 MX MX010859A patent/MX168766B/es unknown
- 1988-03-24 AU AU13587/88A patent/AU612138B2/en not_active Ceased
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6745797B2 (en) | 2001-06-21 | 2004-06-08 | Weavexx Corporation | Papermaker's forming fabric |
US7931051B2 (en) | 2008-01-23 | 2011-04-26 | Weavexx Corporation | Multi-layer papermaker's forming fabric with long machine side MD floats |
US7766053B2 (en) | 2008-10-31 | 2010-08-03 | Weavexx Corporation | Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns |
US8251103B2 (en) | 2009-11-04 | 2012-08-28 | Weavexx Corporation | Papermaker's forming fabric with engineered drainage channels |
Also Published As
Publication number | Publication date |
---|---|
CA1326609C (en) | 1994-02-01 |
FI90361C (fi) | 1994-01-25 |
AU612138B2 (en) | 1991-07-04 |
SE8701205D0 (sv) | 1987-03-24 |
FI90361B (fi) | 1993-10-15 |
NO881141L (no) | 1988-09-26 |
SE8701205L (sv) | 1988-09-25 |
NO168840C (no) | 1992-04-08 |
EP0284575A1 (en) | 1988-09-28 |
NO168840B (no) | 1991-12-30 |
NO881141D0 (no) | 1988-03-15 |
ES2023015B3 (es) | 1991-12-16 |
ATE64964T1 (de) | 1991-07-15 |
FI881285A (fi) | 1988-09-25 |
MX168766B (es) | 1993-06-07 |
FI881285A0 (fi) | 1988-03-18 |
SE460125B (sv) | 1989-09-11 |
DE3863453D1 (de) | 1991-08-08 |
BR8801159A (pt) | 1988-10-18 |
AU1358788A (en) | 1988-09-22 |
JPS63295787A (ja) | 1988-12-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0284575B1 (en) | A dewatering medium for forming paper sheets | |
US4998569A (en) | Single-layer papermaking broken-twill fabric avoiding wire marks | |
US4640741A (en) | Forming fabric for use in a papermaking machine | |
CA2229613C (en) | Papermaker's fabric with additional cross machine direction yarns positioned in saddles | |
US4989647A (en) | Dual warp forming fabric with a diagonal knuckle pattern | |
US4759975A (en) | Papermaker's wet press felt having multi-layered base fabric | |
US4501303A (en) | Forming fabric | |
CA1278240C (en) | Paper forming fabric | |
EP0123431B1 (en) | Papermaker's felt having multi-layered base fabric and method of making the same | |
RU2347019C2 (ru) | Многослойная формовочная ткань, состоящая из двух систем основных нитей с трехниточным соединением | |
KR100732001B1 (ko) | 기계측 너클을 형성하는 기계방향 접결사를 구비한 제지용성형직물 | |
JP4312382B2 (ja) | 織成ファブリック | |
US20060063451A1 (en) | Papermachine clothing | |
US8444826B2 (en) | Industrial filtration fabric with high center plane resistance | |
MXPA05006479A (es) | Enlace de doble cruce paralelo para tela. | |
JPH0219587A (ja) | 抄紙機のシート形成部用の二重層張布 | |
AU581559B2 (en) | Sixteen harness dual layer weave | |
US5238536A (en) | Multilayer forming fabric | |
CA2142283C (en) | Forming web | |
US3705079A (en) | Press fabric for a papermaking machine press section having selected large incompressible yarns | |
EP1951954B1 (en) | Paper machine fabric | |
JP3883276B2 (ja) | 上層織物に補助緯糸を配置した工業用2層織物 | |
JPH0268384A (ja) | 製紙面の凹所に補助緯糸を配置した製紙用一重織物 | |
CA1262329A (en) | Forming fabric | |
JP3883275B2 (ja) | 上層織物に補助緯糸を配置した工業用2層織物 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IT LI NL SE |
|
17P | Request for examination filed |
Effective date: 19890316 |
|
17Q | First examination report despatched |
Effective date: 19900925 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB GR IT LI NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19910703 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19910703 |
|
REF | Corresponds to: |
Ref document number: 64964 Country of ref document: AT Date of ref document: 19910715 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3863453 Country of ref document: DE Date of ref document: 19910808 |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO GLP S.R.L. |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20030129 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20030205 Year of fee payment: 16 Ref country code: CH Payment date: 20030205 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20030206 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20030219 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20030220 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20030225 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20030226 Year of fee payment: 16 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040222 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040222 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040223 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040229 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040229 |
|
BERE | Be: lapsed |
Owner name: *NORDISKAFILT A.B. Effective date: 20040228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040901 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040901 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20040222 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20041029 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20040901 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050222 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20040223 |