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WO2004104295A1 - Warp bound composite papermaking fabric - Google Patents

Warp bound composite papermaking fabric Download PDF

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Publication number
WO2004104295A1
WO2004104295A1 PCT/EP2004/050194 EP2004050194W WO2004104295A1 WO 2004104295 A1 WO2004104295 A1 WO 2004104295A1 EP 2004050194 W EP2004050194 W EP 2004050194W WO 2004104295 A1 WO2004104295 A1 WO 2004104295A1
Authority
WO
WIPO (PCT)
Prior art keywords
fabric
yams
weft
waφ
weave
Prior art date
Application number
PCT/EP2004/050194
Other languages
French (fr)
Other versions
WO2004104295A9 (en
WO2004104295A8 (en
Inventor
Scott Quigley
James Brewster
Original Assignee
Voith Fabric Patent Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US10/443,474 external-priority patent/US7059359B2/en
Application filed by Voith Fabric Patent Gmbh filed Critical Voith Fabric Patent Gmbh
Priority to EP04713898A priority Critical patent/EP1631717A1/en
Priority to US10/557,290 priority patent/US20070068590A1/en
Publication of WO2004104295A1 publication Critical patent/WO2004104295A1/en
Publication of WO2004104295A8 publication Critical patent/WO2004104295A8/en
Publication of WO2004104295A9 publication Critical patent/WO2004104295A9/en

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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 present invention is directed to a composite papermaking fabric which is preferably used in the forming section but could also be used in the dryer section.
  • composite fabric refers to a fabric comprising two woven structures one of which is the paper side fabric or upper fabric and the other of which is the machine side fabric or lower fabric.
  • the paper side fabric includes a support surface which surface receives and supports the paper forming pulp during the paper forming operation.
  • the lower or contact fabric separates the support fabric from the machine rollers during the paper forming operation and includes a roller contact or contact surface. Both fabrics must be stable and provide the required drainage.
  • the support fabric must also provide an even support surface without unduly high knuckles or unduly deep knuckle depressions so as to not mark the paper during the paper forming operation.
  • the upper and lower fabrics are bound together with a binder yam which in the instant case comprises fabric bom warp yam.
  • fabric bom warp yam indicates that the binder yam while binding the upper and lower fabrics together also weaves in the machine direction with and is an integral part of the weave pattern of both the upper and lower fabrics.
  • warp yarn refers to yams which weave in a single specified layer of the fabric and in the machine direction.
  • weft yam refers to ya s woven transverse of the warp yams.
  • Another object of the invention is a papermaking fabric in which the support surface is formed in a one up, one down weave pattern.
  • Another object of the invention is a composite papermaking fabric in which fabric bom warp yams bind the upper and lower fabrics together and weave with weft ya s to form the lower fabric.
  • Another object of the invention is a composite papermaking fabric in which the weft yam of the upper fabric at the binding points are supported against downward movement.
  • Another object of the invention is the provision of a composite papermaking fabric in which no pairing of weft ya s appear on either surface.
  • Another object of the invention is the provision of a composite papermaking fabric in which no pairing of wa ⁇ and fabric bom wa ⁇ yams appear on either surface.
  • the present invention is directed to a composite papermaking fabric having an upper fabric which includes a fiber support surface and is formed of wa ⁇ yams, fabric bom wa ⁇ yams and weft yams.
  • the support surface is woven in a one up, one down
  • the papermaking fabric also includes a lower fabric formed of fabric bom wa ⁇ yams and weft yams interwoven to provide a weft yam dominated contact surface.
  • Each fabric bom wa ⁇ yam is controlled to weave over at least one of the upper fabric weft yams during each repeat of the weave pattern forming binding points which act to bind the upper fabric with the lower fabric.
  • the preferred weave pattern requires that each fabric bom wa ⁇ yam weave over two of the upper weft yams to form two binding points which are spaced longitudinally of the weave pattern.
  • the binding points preferably form a broken twill line across the weave pattern and the width of the papermaking fabric. But it is also possible that the binding points form a straight twill line across the paperside weave pattern.
  • the upper wa ⁇ yams float beneath the upper weft yams at each of the binding points forming a support beneath the upper weft yams which acts to maintain knuckle height uniform across the support surface.
  • the fabric bom wa ⁇ yams weave with the weft yams of the lower fabric in preferably a broken twill pattern forming a plurality of even weft floats on the contact surface. There is a plurality of the weft yam floats formed by each lower weft yam per weave pattern repeat.
  • a composite papermaking fabric comprising an upper fabric formed with a support surface woven In a one up, one down weave pattern and a lower fabric formed with a weft dominated contact surface.
  • the papermaking fabric comprises a plurality
  • the wa ⁇ yams weave beneath each of the upper weft yam at the selected locations forming the binding knuckles providing support beneath the upper weft yam and the binding knuckle which support assists in maintaining the binding knuckles parallel with the remainder of the knuckles of the support surface.
  • the weft yam weaving with the fabric bom wa ⁇ yams form the contact surface with two floats on the contact surface per pick throughout a weave pattern repeat.
  • Fig 1 is a cutaway perspective view showing the support surface of the papermaking fabric through a portion of the weave pattern.
  • Fig 2 is a cutaway perspective view showing the contact surface of the papermaking fabric through a portion of the weave pattern.
  • Fig 3 is a side view showing the relationship of wa ⁇ yarn 1 and fabric bom wa ⁇ ya 2 with all of the weft yams through the weave pattern.
  • Fig 4 is similar to Fig 3 showing the relationship of wa ⁇ yam 3 and fabric bom wa ⁇ yam 4 with the weft yams through the weave pattern.
  • Fig 5 is similar to Fig 3 showing the relationship of wa ⁇ yam 5 and fabric bom l o wa ⁇ yam 6 with the weft yams through the weave pattern.
  • Fig 6 is similar to Fig 3 showing the relationship of wa ⁇ yam 7 and fabric bom wa ⁇ yam 8 with the weft yams through the weave pattern.
  • Fig 7 is similar to Fig 3 showing the relationship of wa ⁇ yam 9 and fabric bom wa ⁇ yam 10 with the weft yams through the weave pattern.
  • Fig 8 is similar to Fig 3 showing the relationship of wa ⁇ yam 11 and fabric bom wa ⁇ yam 12 with the weft yams through the weave pattern.
  • Fig 9 is similar to Fig 3 showing the relationship of wa ⁇ yam 13 and fabric bom wa ⁇ yam 14 with the weft yams through the weave pattern.
  • Fig 10 is similar to Fig 3 showing the relationship of wa ⁇ yam 15 and fabric 20 bom wa ⁇ yam 16 with the weft yams through the weave pattern.
  • Fig 11 is a diagram of the weave pattern of the support surface.
  • Fig 12 is a diagram of the weave pattern of the contact surface.
  • Figs 1 and 2 represent sectional perspective views of the composite papermaking in which the upper fabric A is formed with a paper pulp support surface C as shown in Fig 1 and the lower contact fabric B which is formed with a lower roller contact surface D as shown in Fig 2.
  • upper fabric A and more specifically, support surface C is woven in a one up, one down weave pattern allowing the support surface to present an even array of wa ⁇ knuckles separated on each side by a weft knuckle. This is best illustrated in Fig 11 where each O represents a wa ⁇ yam passing over a weft yam on the support surface. Each passover forms a wa ⁇ knuckle.
  • each weft ya passing over a wa ⁇ yam on the support surface is represented by a blank square. These passovers form weft knuckles. Each O represents a binding point where the wa ⁇ yam passing over the weft yam is an fabric bom wa ⁇ yam.
  • the fabric is woven utilizing eight wa ⁇ yams numbered 1 , 3, 5, 7, 9, 11 , 13 & 15 and with eight fabric born wa ⁇ yams numbered 2, 4, 6, 8, 10, 12 & 16 per weave pattern repeat which is a so called 16 shaft weave.
  • the present invention is not limited to the weave repeat shown in the figures. It's understood that the weave repeat in general can be 16 shaft or greater. Therefore the weave repeat could be for example a 20 shaft or a 24 shaft or a 28 shaft or a 32 shaft or a 40 shaft weave.
  • the weave pattern repeat also weaves with forty weft yams numbered 1-40.
  • the x represents the binding points or the positions in which an fabric bom wa ⁇ yam passes over an upper weft yam weaving with the support fabric A to bind the support fabric A with the contact fabric B forming the composite fabric.
  • binding points which form binding knuckles 70, are identified in Figs 1 and 3-10.
  • Figs 3-10 are side views of each of the wa ⁇ and fabric bom wa ⁇ yams weaving with the weft yams 1-40 through a complete repeat of the weave pattem.
  • the ratio of upper weft yams to lower weft yams is 3 : 2. It is understood that this ratio is not limiting the scope of the invention, therefore the ratio exemplary also could be 2 : 1 or 5 : 3.
  • wa ⁇ yams 1 , 3, 5, 7, 9, 11 , 13 & 15 weave only with weft yams 2, 3, 5, 7, 8, 10, 12, 13, 15, 17, 18, 20, 22, 23, 25, 27, 28, 30, 32, 33, 35, 37, 38 & 40 forming support fabric A.
  • the weave pattem at selected points brings the upper wa ⁇ yams to float beneath five consecutive of the upper weft yam picks, such as wa ⁇ yam 1 at the pick of weft yams 15, 17, 18, 20 & 22 in Fig 3 and warp yarn 5 at the pick of weft yams 5, 7, 8, 10 and 12 in Fig 5. It is along these floats that the fabric bom wa ⁇ yams are brought up to pass over two spaced picks, such as fabric bom wa ⁇ yam 2 over picks 17 & 20 in Fig 3 and fabric bom wa ⁇ yam 6 over picks 7 and 10 in Fig 5, binding upper fabric A with lower fabric B. Throughout the remainder of the weave pattern, each of the fabric bom wa ⁇ yams
  • the wa ⁇ yams weave during each repeat of said weave pattern with a predominant or major portion of the upper weft yams and that the fabric bom wa ⁇ yams weave only with a minor portion of the upper weft yams to form the upper fabric weave pattem. It is to be understood that a major portion means a portion of more that 50% and a minor portion means a portion of less than 50%.
  • the associated upper wa ⁇ yam passes beneath the pick where the binding point is formed with the fabric bom wa ⁇ yam.
  • wa ⁇ 1 passes beneath weft yam or picks 17 & 20 at binding points 70.
  • wa ⁇ yam or pick 5 passes beneath weft yams 7 & 10 at binding point 70.
  • the weave pattern of the support fabric A predominantly is formed by the weaving of the wa ⁇ yams 2, 3, 5, 7, 8, 10, 11 ...
  • applicant in general came to the conclusion that for creating a smooth and uniform support surface C it is necessary that the upper (paper side) weft yams which interweave with fabric bom wa ⁇ yams or wa ⁇ yams and thereby only form a minor portion of the support fabric A need to be supported against vertical downward movement. Therefore, e.g. wa ⁇ yam 1 floats beneath (paper side) weft yams 17, 18 & 20.
  • This vertical support acts to help maintain the crest of the knuckles formed at binding points 70 elevated and on an even and substantially parallel plane with the remainder of the knuckles forming the support surface C. Also, by passing the upper warp yams beneath the upper weft at the binding points no adjacent knuckles appear on the support surface at the binding points.
  • FIGs 2-10 & 12 contact fabric B will now be discussed.
  • contact fabric B is woven in a broken twill pattem with each fabric bom wa ⁇ yarn passing beneath four weft yams at spaced locations on contact surface D.
  • Each fabric bom wa ⁇ yam either floats above the lower weft yams and beneath the wa ⁇ and weft yams of the upper or support fabric A or passes over the two of the upper picks forming binding points 70 throughout the remainder of each weave pattem as earlier discussed.
  • the ya s selected for forming the disclosed may comprise yams of the same diameter or of varying diameters if desired. For example, it may be desirable to weave the support fabric with weft yams of less size than the weft yams forming the contact fabric.
  • the wa ⁇ and the fabric bom wa ⁇ yams preferably are of the same size.
  • Variation in yam size may be selected depending upon the performance requirements.
  • the materials chosen for the yams can vary depending upon the performance needs of the formed papermaking fabric. Generally stability is of the utmost importance, it being desired that the drainage capability be maintained throughout the life of the papermaking fabric. Also, wearability is another vital factor due to cost.
  • polyester yams which exhibit excellent stability characteristics may be selected to form the support surface and as the fabric bom wa ⁇ yams.
  • the running or contact surface weft yarns may all or partly be polyamide yams due to greater wearability characteristics.
  • the contact side weft yams may be of a larger diameter than the support fabric weft yams.
  • Other synthetic materials and size combinations may be selected to form the wa ⁇ , weft, and fabric bom wa ⁇ yams of the invention dependent upon the required performance needs of the fabric.

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  • Paper (AREA)

Abstract

A composite papermaking fabric comprising an upper support fabric and a lower contact fabric. The upper fabric is formed of warp yams, fabric born warp yams and weft yams interwoven to provide the upper fabric with a support surface forming a one up, one down weave. The lower fabric is formed of the fabric born warp yams interwoven with weft yarns in a weave pattern which provides a weft yam dominated contact surface. Each of the fabric born warp yams also weaves over at least one of the upper fabric weft yarns during each repeat of the weave pattern forming binding points which bind the upper and lower fabrics together.

Description

WARP BOUND COMPOSITE PAPERMAKING FABRIC
Background of the Invention
The present invention is directed to a composite papermaking fabric which is preferably used in the forming section but could also be used in the dryer section. The term composite fabric refers to a fabric comprising two woven structures one of which is the paper side fabric or upper fabric and the other of which is the machine side fabric or lower fabric. The paper side fabric includes a support surface which surface receives and supports the paper forming pulp during the paper forming operation. The lower or contact fabric separates the support fabric from the machine rollers during the paper forming operation and includes a roller contact or contact surface. Both fabrics must be stable and provide the required drainage. The support fabric must also provide an even support surface without unduly high knuckles or unduly deep knuckle depressions so as to not mark the paper during the paper forming operation. The upper and lower fabrics are bound together with a binder yam which in the instant case comprises fabric bom warp yam. The term fabric bom warp yam indicates that the binder yam while binding the upper and lower fabrics together also weaves in the machine direction with and is an integral part of the weave pattern of both the upper and lower fabrics. The term warp yarn refers to yams which weave in a single specified layer of the fabric and in the machine direction. The term weft yam refers to ya s woven transverse of the warp yams.
Composite papermaking fabrics are well known as are illustrated by the U.S.
Patents 5,152,326; 5.826,627; 6,202,705; and 6,240,973.
It is an object of the present invention to provide a composite papermaking fabric which provides uniform drainage, a smooth and even support surface and extended wear.
Another object of the invention is a papermaking fabric in which the support surface is formed in a one up, one down weave pattern.
Another object of the invention is a composite papermaking fabric in which fabric bom warp yams bind the upper and lower fabrics together and weave with weft ya s to form the lower fabric.
Another object of the invention is a composite papermaking fabric in which the weft yam of the upper fabric at the binding points are supported against downward movement.
Another object of the invention is the provision of a composite papermaking fabric in which no pairing of weft ya s appear on either surface.
Another object of the invention is the provision of a composite papermaking fabric in which no pairing of waφ and fabric bom waφ yams appear on either surface.
Summary of the Invention
The present invention is directed to a composite papermaking fabric having an upper fabric which includes a fiber support surface and is formed of waφ yams, fabric bom waφ yams and weft yams. The support surface is woven in a one up, one down
weave pattern. The papermaking fabric also includes a lower fabric formed of fabric bom waφ yams and weft yams interwoven to provide a weft yam dominated contact surface. Each fabric bom waφ yam is controlled to weave over at least one of the upper fabric weft yams during each repeat of the weave pattern forming binding points which act to bind the upper fabric with the lower fabric. The preferred weave pattern requires that each fabric bom waφ yam weave over two of the upper weft yams to form two binding points which are spaced longitudinally of the weave pattern. The binding points preferably form a broken twill line across the weave pattern and the width of the papermaking fabric. But it is also possible that the binding points form a straight twill line across the paperside weave pattern.
To insure that the support surface is even and smooth, the upper waφ yams float beneath the upper weft yams at each of the binding points forming a support beneath the upper weft yams which acts to maintain knuckle height uniform across the support surface. The fabric bom waφ yams weave with the weft yams of the lower fabric in preferably a broken twill pattern forming a plurality of even weft floats on the contact surface. There is a plurality of the weft yam floats formed by each lower weft yam per weave pattern repeat.
A composite papermaking fabric comprising an upper fabric formed with a support surface woven In a one up, one down weave pattern and a lower fabric formed with a weft dominated contact surface. The papermaking fabric comprises a plurality
of waφ yams weaving with upper weft yams in a selected first weave pattern and a plurality of fabric bom waφ yams weaving with lower weft yams in a selected second weave pattern forming the lower fabric and weaving with the upper weft yams in the second selected weave pattern to cross over the upper weft yams at selected locations forming binding knuckles. The fabric bom waφ yams at the binding knuckles bind the upper fabric with the lower fabric. The binding knuckles cooperate with the knuckles of the waφ yams weaving' in the first weave pattern to form the support surface in a one up, one down weave pattern.
The waφ yams weave beneath each of the upper weft yam at the selected locations forming the binding knuckles providing support beneath the upper weft yam and the binding knuckle which support assists in maintaining the binding knuckles parallel with the remainder of the knuckles of the support surface.
The weft yam weaving with the fabric bom waφ yams form the contact surface with two floats on the contact surface per pick throughout a weave pattern repeat.
Drawings
Fig 1 is a cutaway perspective view showing the support surface of the papermaking fabric through a portion of the weave pattern.
Fig 2 is a cutaway perspective view showing the contact surface of the papermaking fabric through a portion of the weave pattern.
5 Fig 3 is a side view showing the relationship of waφ yarn 1 and fabric bom waφ ya 2 with all of the weft yams through the weave pattern.
Fig 4 is similar to Fig 3 showing the relationship of waφ yam 3 and fabric bom waφ yam 4 with the weft yams through the weave pattern.
Fig 5 is similar to Fig 3 showing the relationship of waφ yam 5 and fabric bom l o waφ yam 6 with the weft yams through the weave pattern.
Fig 6 is similar to Fig 3 showing the relationship of waφ yam 7 and fabric bom waφ yam 8 with the weft yams through the weave pattern.
Fig 7 is similar to Fig 3 showing the relationship of waφ yam 9 and fabric bom waφ yam 10 with the weft yams through the weave pattern. is Fig 8 is similar to Fig 3 showing the relationship of waφ yam 11 and fabric bom waφ yam 12 with the weft yams through the weave pattern.
Fig 9 is similar to Fig 3 showing the relationship of waφ yam 13 and fabric bom waφ yam 14 with the weft yams through the weave pattern.
Fig 10 is similar to Fig 3 showing the relationship of waφ yam 15 and fabric 20 bom waφ yam 16 with the weft yams through the weave pattern.
Fig 11 is a diagram of the weave pattern of the support surface. Fig 12 is a diagram of the weave pattern of the contact surface.
Detailed Description
Turning now to the drawings Figs 1 and 2 represent sectional perspective views of the composite papermaking in which the upper fabric A is formed with a paper pulp support surface C as shown in Fig 1 and the lower contact fabric B which is formed with a lower roller contact surface D as shown in Fig 2. As shown in Fig 1 and further illustrated in Fig 11 , upper fabric A and more specifically, support surface C is woven in a one up, one down weave pattern allowing the support surface to present an even array of waφ knuckles separated on each side by a weft knuckle. This is best illustrated in Fig 11 where each O represents a waφ yam passing over a weft yam on the support surface. Each passover forms a waφ knuckle. Likewise, each weft ya passing over a waφ yam on the support surface is represented by a blank square. These passovers form weft knuckles. Each O represents a binding point where the waφ yam passing over the weft yam is an fabric bom waφ yam.
The fabric is woven utilizing eight waφ yams numbered 1 , 3, 5, 7, 9, 11 , 13 & 15 and with eight fabric born waφ yams numbered 2, 4, 6, 8, 10, 12 & 16 per weave pattern repeat which is a so called 16 shaft weave. The present invention is not limited to the weave repeat shown in the figures. It's understood that the weave repeat in general can be 16 shaft or greater. Therefore the weave repeat could be for example a 20 shaft or a 24 shaft or a 28 shaft or a 32 shaft or a 40 shaft weave. The weave pattern repeat also weaves with forty weft yams numbered 1-40. Weft yams 2, 3, 5, 7, 8, 10, 11, 12, 13, 15, 17, 18, 20, 22, 23, 25, 27, 28, 30, 32, 33, 35, 37, 38 & 40 weave with the waφ yams and the fabric bom waφ yams to form the upper or support
fabric A. Weft yams 1, 4, 6, 9, 11, 14, 16, 19, 21, 24, 26, 29, 31, 34, 36 & 39 weave only with the fabric bom waφ yam to form lower or contact fabric B.
Again turning to Figs 1 , 2, 11 & 12. In Figs 1 & 11 , the x represents the binding points or the positions in which an fabric bom waφ yam passes over an upper weft yam weaving with the support fabric A to bind the support fabric A with the contact fabric B forming the composite fabric. These binding points, which form binding knuckles 70, are identified in Figs 1 and 3-10.
Figs 3-10 are side views of each of the waφ and fabric bom waφ yams weaving with the weft yams 1-40 through a complete repeat of the weave pattem. As can be seen in Figs 3 - 10 the ratio of upper weft yams to lower weft yams is 3 : 2. It is understood that this ratio is not limiting the scope of the invention, therefore the ratio exemplary also could be 2 : 1 or 5 : 3. As is dearly shown, waφ yams 1 , 3, 5, 7, 9, 11 , 13 & 15 weave only with weft yams 2, 3, 5, 7, 8, 10, 12, 13, 15, 17, 18, 20, 22, 23, 25, 27, 28, 30, 32, 33, 35, 37, 38 & 40 forming support fabric A. The weave pattem at selected points brings the upper waφ yams to float beneath five consecutive of the upper weft yam picks, such as waφ yam 1 at the pick of weft yams 15, 17, 18, 20 & 22 in Fig 3 and warp yarn 5 at the pick of weft yams 5, 7, 8, 10 and 12 in Fig 5. It is along these floats that the fabric bom waφ yams are brought up to pass over two spaced picks, such as fabric bom waφ yam 2 over picks 17 & 20 in Fig 3 and fabric bom waφ yam 6 over picks 7 and 10 in Fig 5, binding upper fabric A with lower fabric B. Throughout the remainder of the weave pattern, each of the fabric bom waφ yams
weaves with selected of the upper weft yams securing support fabric A with contact fabric B at the binding points illustrated in Fig 11 along each fabric bom waφ yam. The binding points form a broken twill pattern over the support surface. It has to be stated that the weave pattern of the support fabric A predominantly is created by the weaving of the waφ yams 1 , 3, 5, 7, ... with the upper (paper side) weft yams 2, 3, 5, 7, 8, 10, 11 , 12, 13, 15, 17, 18, 20, 22, 23, 25, 27, 28, 30, 32, 33, 35, 37, 38 & 40 and that the weaving of the fabric bom waφ yams 2, 4, 6, 8, 10, 12 & 16 with the (paper side) weft yams gives a minor contribution to the weave pattern of the support fabric
A. It can be stated that for the composite papermaking fabric according to the invention the waφ yams weave during each repeat of said weave pattern with a predominant or major portion of the upper weft yams and that the fabric bom waφ yams weave only with a minor portion of the upper weft yams to form the upper fabric weave pattem. It is to be understood that a major portion means a portion of more that 50% and a minor portion means a portion of less than 50%.
By way of example as can be seen in Fig 3 waφ yam 1 weaves with upper
(paper side) weft yams 2, 3, 5, 7. 8, 10, 12, 13. 15. 22, 23, 25, 27. 28, 30, 32, 33, 35, 37, 38 & 40 a one up, one down weave pattern and floats beneath the upper (paper side) weft yams 17, 18, 20. The weave pattern of the support fabric A is completed by the weaving of the fabric bom waφ yam 2 with the weft yams 17, 18, 20.
In the weave pattern shown in Fig 3 waφ yam 1 weaves with seven times more
(paper side) wefts than fabric bom waφ yam 2.
Again, as seen in Figs 1 & 3-10 at each binding point 70, the associated upper waφ yam passes beneath the pick where the binding point is formed with the fabric bom waφ yam. In the above referred to example , waφ 1 passes beneath weft yam or picks 17 & 20 at binding points 70. Likewise in Fig 5 waφ yam or pick 5 passes beneath weft yams 7 & 10 at binding point 70. By so controlling the upper waφ yams to be positioned beneath the binding points 70 they function to support the weft yams' * and thereby the binding knuckles against vertical downward movement. As described previously the weave pattern of the support fabric A predominantly is formed by the weaving of the waφ yams 2, 3, 5, 7, 8, 10, 11 ... In advanced studies applicant in general came to the conclusion that for creating a smooth and uniform support surface C it is necessary that the upper (paper side) weft yams which interweave with fabric bom waφ yams or waφ yams and thereby only form a minor portion of the support fabric A need to be supported against vertical downward movement. Therefore, e.g. waφ yam 1 floats beneath (paper side) weft yams 17, 18 & 20. This vertical support acts to help maintain the crest of the knuckles formed at binding points 70 elevated and on an even and substantially parallel plane with the remainder of the knuckles forming the support surface C. Also, by passing the upper warp yams beneath the upper weft at the binding points no adjacent knuckles appear on the support surface at the binding points.
Turning now to Figs 2-10 & 12 contact fabric B will now be discussed. As seen in Figs 2 & 12 contact fabric B is woven in a broken twill pattem with each fabric bom waφ yarn passing beneath four weft yams at spaced locations on contact surface D. Each fabric bom waφ yam either floats above the lower weft yams and beneath the waφ and weft yams of the upper or support fabric A or passes over the two of the upper picks forming binding points 70 throughout the remainder of each weave pattem as earlier discussed.
. Turning again to Figs 2 & 12 it can be seen that the weave pattem forming lower fabric B produces a weft dominated contact surface D with each weft weaving with the lower fabric waφ yams to form two floats per pick throughout the weave pattem each of which passes beneath three waφ yams. This weave pattem forms a weft yam dominated running or contact surface D.
The ya s selected for forming the disclosed may comprise yams of the same diameter or of varying diameters if desired. For example, it may be desirable to weave the support fabric with weft yams of less size than the weft yams forming the contact fabric. The waφ and the fabric bom waφ yams preferably are of the same size.
Variation in yam size may be selected depending upon the performance requirements.
The materials chosen for the yams can vary depending upon the performance needs of the formed papermaking fabric. Generally stability is of the utmost importance, it being desired that the drainage capability be maintained throughout the life of the papermaking fabric. Also, wearability is another vital factor due to cost.
Accordingly, polyester yams which exhibit excellent stability characteristics may be selected to form the support surface and as the fabric bom waφ yams. The running or contact surface weft yarns may all or partly be polyamide yams due to greater wearability characteristics. Also, the contact side weft yams may be of a larger diameter than the support fabric weft yams. Other synthetic materials and size combinations may be selected to form the waφ, weft, and fabric bom waφ yams of the invention dependent upon the required performance needs of the fabric.

Claims

What is claimed is:
1. A composite papermaking fabric comprising: an upper fabric formed of waφ yams, fabric bom waφ yams and upper weft yams interwoven to provide a support surface formed in a one up, one down weave pattem; a lower fabric formed of fabric bom waφ yams and lower weft yams interwoven to provide a weft yam dominated contact surface; each said fabric bom waφ yam weaving over at least one of said upper weft yams during each repeat of said weave pattern forming binding points binding said upper fabric with said lower fabric, 2. The composite papermaking fabric of claim 1 , wherein said waφ yams weave during each repeat of said weave pattem with a major portion of said upper weft yams and wherein said fabric bom waφ yams weave only with a minor portion of said upper weft yams to form the upper fabric weave pattern.
3. The composite papermaking fabric of claim 1 or claim 2 wherein each said fabric bom waφ yam weaves over at least two of said upper weft yams forming two binding points spaced longitudinally of said weave pattern.
4. The composite papermaking fabric of any preceding claim wherein said binding points form a broken twill line across said weave pattem.
5. The composite papermaking fabric of any preceding claim wherein said upper waφ yams float beneath said upper weft yams at said binding points forming
5 supports for said weft yams at said binding points which act to maintain knuckle height uniform across said support surface.
6. The composite papermaking fabric of any preceding claim wherein said fabric bom waφ yams weave with said weft yams of said lower fabric in a broken twill pattern forming a plurality of weft yams float on the contact surface. o 7. The composite papermaking fabric of claim 6 wherein there are a plurality of said weft floats per lower fabric weft yam per weave pattern repeat.
8. The composite papermaking fabric of any preceding claim, wherein said weave pattem comprises equal numbers of said waφ yams and said fabric bom waφ yams. s 9. The composite papermaking fabric of any preceding claim wherein said weave pattem comprises eight of said waφ yams, eight of said fabric bom waφ yams and forty of said weft yams per weave pattern repeat.
10. The composite papermaking fabric of any preceding claim wherein the ratio of upper weft yams to lower weft is 2 : 1 or 3 : 2 or 5 : 3. 0 12. The composite papermaking fabric of any preceding claim wherein the weave repeat is at least 16 shaft weave repeat.
13. A composite papermaking fabric comprising an upper fabric formed with a support surface woven in a one up, one down weave pattern and a lower fabric formed with a weft dominated contact surface; 5 a plurality of waφ yams weaving with upper weft yams in a selected first
weave pattem forming warp knuckles over said support surface; a plurality of fabric bom waφ yams weaving with lower weft yams and said upper weft yams in a selected second weave pattern; said fabric bom waφ yams and said lower weft yams forming said lower fabric and said fabric bom waφ yams and said upper weft yams forming binding knuckles with said upper weft yams at selected locations over said support surface, said binding knuckles binding said upper fabric with said lower fabric; and said binding knuckles cooperating with said waφ knuckles of sajd support surface to form said support surface with said one up, one down weave pattern.'
14. The composite papermaking fabric of claim 13 wherein said waφ yams weave beneath each said upper weft yam at each of said selected locations beneath providing vertical support for said upper weft yam and said binding knuckle.
15. The composite papermaking fabric of claim 13 or claim 14 wherein said weft yam of said contact surface form two floats per pick per weave pattern repeat.
16. The composite papermaking fabric of any preceding claim wherein the wearside fully or partially consists of wear resistant yams.
PCT/EP2004/050194 2003-05-22 2004-02-24 Warp bound composite papermaking fabric WO2004104295A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04713898A EP1631717A1 (en) 2003-05-22 2004-02-24 Warp bound composite papermaking fabric
US10/557,290 US20070068590A1 (en) 2003-05-22 2004-02-24 Warp bound composite papermaking fabrics

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10/443,474 US7059359B2 (en) 2003-05-22 2003-05-22 Warp bound composite papermaking fabric
US10/443,474 2003-05-22
CA2440263A CA2440263C (en) 2003-05-22 2003-09-09 Warp bound composite papermaking fabric
CA2,440,263 2003-09-09

Publications (3)

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WO2004104295A1 true WO2004104295A1 (en) 2004-12-02
WO2004104295A8 WO2004104295A8 (en) 2005-01-20
WO2004104295A9 WO2004104295A9 (en) 2005-03-03

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EP (1) EP1631717A1 (en)
WO (1) WO2004104295A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152326A (en) * 1989-11-16 1992-10-06 F. Oberdorfer Gmbh & Co. Kg, Industriegewebe-Technik Binding thread arrangement in papermaking wire

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152326A (en) * 1989-11-16 1992-10-06 F. Oberdorfer Gmbh & Co. Kg, Industriegewebe-Technik Binding thread arrangement in papermaking wire

Also Published As

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EP1631717A1 (en) 2006-03-08
WO2004104295A9 (en) 2005-03-03
WO2004104295A8 (en) 2005-01-20

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