WO1993007338A1 - Woven papermakers fabric having a unibody seam and a method for making the same - Google Patents
Woven papermakers fabric having a unibody seam and a method for making the same Download PDFInfo
- Publication number
- WO1993007338A1 WO1993007338A1 PCT/US1992/008665 US9208665W WO9307338A1 WO 1993007338 A1 WO1993007338 A1 WO 1993007338A1 US 9208665 W US9208665 W US 9208665W WO 9307338 A1 WO9307338 A1 WO 9307338A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- machine direction
- fabric
- cross machine
- yarns
- belt
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
- D06H5/00—Seaming textile materials
-
- 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
- D21F1/0054—Seams thereof
Definitions
- the present invention relates generally to the joining of woven fabrics to render them endless. More particularly, the invention related to joining paperma ers to render them as an endless belt on the paperma ing equipment. Most particularly, the present invention relates to joining woven papermakers dryer fabrics by interleaving complementary projections and recesses on each end of the fabric and inserting a retaining means into a channel formed in the cross machine direction.
- the process may be labor intensive and/or produce a seam which does not have the same caliper as the remainder of the fabric or does not share other fabric characteristics with the remainder of the fabric.
- efforts were undertaken to produce a join area which, except for the retaining means, was formed entirely from the fabric as woven.
- the efforts were directed toward preserving the fabric construction, caliper and operating characteristics throughout the seam area.
- the desired seam would not require a doubling or folding back of the fabric end.
- the present invention provides an endless papermakers felt which is formed from a length of woven fabric and has its ends joined to form the endless belt.
- the endless belt is characterized by joining loops which are formed at each end of the fabric without the addition of any materials to the weave.
- the joining loops are formed entirely from the yarns which are part of the woven fabric and, as formed, are a linear continuation of the original woven fabric.
- the joined area maintains all of the woven characteristics of the fabric and is substantially identical to the remainder of the fabric.
- the present invention provides a method for producing the fabric.
- each end of the woven fabric is trimmed to establish a maximum fabric length and to provide a true cross machine direction edge on each end of the fabric.
- Each cross machine direction edge is parallel to the last cross machine direction yarn on the respective edge.
- at least one cross machine direction yarn is removed from each end of the fabric. The removed yarns are positioned at least one cross machine direction yarn from the respective fabric edge and create a cross machine direction void on the respective fabric edge.
- a plurality of alternating projections and recesses are formed on each end of the fabric.
- the alternating projections and recesses are formed on the respective ends so that they will complement each other and the cross machine direction void at each respective end is at substantially the same distance from the respective edge.
- the projections and recesses are interleaved to form an uninterrupted linear continuation of the original woven fabric and to align the cross machine direction voids. After the voids have been aligned, retaining means are inserted in the cross machine direction to render the fabric endless.
- Figure 1 is a perspective view of a section of woven fabric prior to its preparation in accordance with the invention.
- Figure 2 is a top plan view of a section of fabric as illustrated in Figure 1.
- Figure 3 is a top plan view similar to that of Figure 2 and shows the removal of a cross machine direction yarn.
- Figure 4 is a top plan view of a fabric according to the present invention prior to being joined and retained as an endless fabric.
- Figure 5 is a perspective illustration of the fabric as shown in Figure 4.
- Figure 6 is a top plan view illustrating the fabric in its joined configuration.
- Figure 7 is a top plan view illustrating the fabric in position for the formation of a true cut.
- Figure 8 illustrates one device for forming the fabric ends in accordance with the present invention.
- Figure 9 illustrates a rotary device for further preparing the fabric edge in accordance with the present invention.
- Figure 10 illustrates a non-rotary device for preparing the ends of the fabric in accordance with the present invention.
- Figure 11 illustrates one potential pattern for preparing the fabric ends in accordance with the present invention.
- Figure 12 illustrates one suitable retainer means for joining the fabric. DESCRIPTION OF THE PREFERRED EMBODIMENT
- the illustrative fabric is a flat woven fabric which is more fully described in International Application Number PCT/US 91/01776 which was filed on March 15, 1991 with a designation for Canada and is assigned to the common assignee. It will be understood by those skilled in the art that the fabric
- the fabric must be comprised of bondable or thermoplastic yarns. " Turning to Figure 1, the fabric is constructed of synthetic, thermoplastic monofilament yarns. In the illustrated configuration, the upper machine direction yarns 16 and the lower machine direction yarns 18 have a non-circular or flattened profile. The machine direction yarns are woven so that paired
- the cross machine direction yarns system is comprised of alternating yarns 12 and 14. As illustrated in Figure 1, the cross machine direction yarn 14 is of a smaller diameter than cross machine direction yarn 12. 5 As a result, the caliper of the fabric is substantially consistent throughout its length despite the fact that the machine direction yarns 16 and 18 both interweave at the same position with yarn 14.
- the cross machine direction yarn 12 may be about 0.8 mm and the cross machine 0 direction 14 may be about 0.6 mm.
- 25 yarn results in the creation of a cross machine direction void.
- one of the larger cross machine direction yarns 12 be the removed yarn.
- the removed yarn be spaced from the cross machine direction edge of the fabric by at least one
- cross machine direction yarn may be removed prior to forming the cross machine direction edge.
- additional stabilization which results from formation
- each end of the fabric is identified as 30, the projections and recesses on the opposed ends of the fabrics have been identified by different numerals in the interest of clarity.
- the recesses 32 will be positioned opposite the projections 36.
- the recesses 38 which alternate with the projections 36 will be positioned opposite the projections 34 which alternate with the recesses 32. This manner
- FIG. 5 With reference to Figure 5, there is shown a partial x orthographic view of the fabric prior to interleaving. Also shown in Figure 5, in a schematic manner, is the remaining portion of the fabric which will extend from each of the portions. Since those skilled in the art will understand that the weave continues throughout the body of the fabric, there is
- machine direction voids 28 will be spaced in the center of the recesses 32 and 34. Accordingly, each of the projections will include a cross machine direction yarn 12 and 14 on either side of the cross machine direction voids 28.
- the yarns will result in material bond between the machine direction yarns 16 and 18 and the cross machine direction yarns 12 and 14. This is generally illustrated by the numeral 40 in Figure 5. It will be appreciated by those skilled in the art that this bonding is localized and that it will not produce 5 deformation in the fabric construction or interference with the projections and recess. As explained in more detail hereinafter, current techniques for producing the fabric will permit the formation of the projections and recesses within very close tolerances. In addition to the machine direction edge bonding which is illustrated at 40, there is additional cross machine
- machine direction yarns 16 are aligned in the seam area. Although not visible in this view, the machine direction yarns 16 are aligned in the seam area.
- 35 18 are also aligned.
- the cross machine direction yarns 12 and 14 are aligned in the seam area.
- pintle 50 is approximately the same size as cross machine direction yarn 12. As can be seen from an examination of the seam area, it will have the same repeat characteristics as the remainder of the fabric. However, the seam area will have machine direction gaps between the projections 34 and 36. It will be obvious to those skilled in the art that the machine direction gaps 52 result from the removal of the cross machine direction yarn segments during preparation of the fabric ends. Likewise, the cross machine direction gaps 54 result from the removal of machine direction yarn segments during formation of the recesses.
- gaps between the projections 34 and 36 will vary with the fabric weave and Figure 6 is only illustrative of the resulting configuration.
- the gaps 52 and 54 maybe beneficial since they permit free movement of the yarn without interference between and among the bonding points 20, 22, 40 and 42.
- the endless fabric will have the same continuous weave pattern throughout its length, that the caliper of the fabric will not be altered, that the loops at each end of the fabric are formed entirely from and are a linear continuation of the original woven fabric and that there are no elements added to the fabric as part of the formation of the seaming loops.
- the insertion of a pintle as a joining expedient is a substitution for the removed cross machine direction yarn. If so desired, one of the removed cross machine direction yarns may be reinserted as the pintle. At present, the use of a pintle 50 is preferred.
- the fabric 10 is presented to a cutting table. As shown in Figure 7, the previously trimmed fabric is presented against the side of a bar 60 which establishes a cross machine direction reference point. At that point, a cross machine direction yarn is selected as the location of the true cut.
- the 10 fabric 10 is marked, 64, along that cross machine direction yarn.
- the cross machine direction marking 64 will become the true cut.
- the true cut may be made by means of a laser which is optically guided along the marking 64 or by other means such as a sharp hot knife or the like. In any event, it is preferred that the true
- - ⁇ cut be accomplished by a means which includes the generation of heat which is sufficient to cause a softening or flow of the material without a deformation thereof.
- the desired temperature will vary according to the selected yarn materials.
- the preferred technique for establishing the fabric end 64 is a laser cut under computer control. With reference to Figure 11, there is illustrated a pattern which may be followed by the computer in accomplishing the desired cuts.
- the laser will control the cutting means so as to make the recesses and projections at the same time.
- a single straight line pattern will still control both cuts. This should aid in creating uniformity of cut and
- the apparatus 100 has a fabric support table 102 and fabric positioning rolls 104 which assist in addressing the fabric around the table. Each end of the fabric is addressed to a side of the bar 60. Bar 60 extends across the table, which is preferably of a width greater than the width of the fabric, and provides a true edge. The fabric is positioned against the bar and the true cut marking 64 is established along the cross machine direction yarn. The fabric is held in position by clamps 106.
- the clamps 106 are spaced from the bar 60 by a sufficient distance to permit easy operation in the seaming area while relieving the seam area from tension which is associated with the weight of the fabric hanging over the rollers 104.
- the true cut edge 64 may be accomplished in a number of ways. One way to accomplish the edge cut is to position the laser guns 116 and 118 with the respective cutting points 120 and 122 on the true cut marks 64.
- the lasers may be guided by a pattern or may be optically guided along the marks 64 as they traverse the cross machine direction. As can be seen from Figure 8, the laser cutting tools depend from the arm 114 and are adjustable with respect to the positioning of the cutting point 120 or 122 as shown by the arrows on arm 114.
- the arm 114 is adjustable in the vertical plane as indicated by the arrows adjacent housing 112.
- Housing 112 supports the arm 114 and encases the control means for generating the laser beams and positioning the lasers.
- the movement of housing 112 is controlled by a computer in accordance with the fabric design parameters.
- the control output from the computer is applied via the input 113 to the control housing 112.
- computer control will provide more variability with respect to meeting the various fabric configurations.
- the cutting apparatus 110 is mounted on a pair of rails no which are of equal length with the table. This will permit the cutting apparatus to continue its movement in the cross machine direction and thereby avoid the possibility of introducing errors by stopping the cutting operation or moving the fabric.
- the table 102 and the cutting apparatus will be suitably mounted for stability.
- the embodiment shown in Figure 8 includes a moveable arm 108 which is intended to swing away from the table 102 and to permit free access to the fabric as a means of improving the alignment operation.
- the true cut edge 64 is subjected to a further bonding step.
- the first approach is depicted in Figure 9.
- two oppositely turning rollers, 70 and 72 are applied against the true cut 64 of the fabric. Each of the rollers is heated and is particularly configured to the geometry of the fabric.
- the rollers 70 and 72 have base portions which meet and form a planar surface against which the true edge 64 is abutted.
- Each roller has an interior portion 74 which is on center line with the base but has a radius which is reduced by the distance 78.
- the distance 78 is substantially equal to one half of the fabric gauge.
- Extending between the interior portion 74 and the base of the rollers is the curvilinear portion 76.
- the rollers 70 and 72 present a continuous interface which maintains the gauge of the fabric and urges the edges of the machine direction yarns 16 and 18 against the side of the cross machine direction yarn 12. This establishes good bonding and a regular true cut edge.
- a second device for accomplishing the preferred bonding is illustrated. With the device shown in Figure 10, the plates 80 and 82 are heated plates which will permit local application to accomplish the desired bonding.
- the faces 84 and 86 of the plates are configured to establish the desired geometry for the true edge of the fabric as previously described in connection with Figure 9.
- the plates 80 and 82 may be separated by vertical movement as a means of allowing the device to be placed in smaller areas or areas where a continuous movement in the cross machine direction is not possible. Accordingly, a device such as that shown in Figure 10 may be used for insertion into the recesses 32 so as to assure the efficiency of the bond 42, see
- the pintle assembly 130 includes a lead wire 132 which is smaller than the desired pintle 50.
- the lead ⁇ 5 wire 132 and the pintle 150 are joined by the conical ferrule 132.
- insertion of the pintle 50 with the assistance of such a lead wire and ferrule are known in the art.
- the configuration as shown in Figure 12 is particularly desirable in the event that the cross machine 0 direction void 28 has been somehow compressed.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92922306A EP0608342B1 (en) | 1991-10-11 | 1992-10-09 | Woven papermakers fabric having a unibody seam and a method for making the same |
DE69206815T DE69206815T2 (en) | 1991-10-11 | 1992-10-09 | PAPER MAKING FABRIC WITH JOINT SEAM FROM ITS OWN THREAD AND METHOD FOR THE PRODUCTION THEREOF |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77504791A | 1991-08-10 | 1991-08-10 | |
US775,047 | 1991-10-11 | ||
US951,311 | 1992-09-24 | ||
US07/951,311 US5366778A (en) | 1991-10-11 | 1992-09-24 | Woven papermakers fabric having a unibody seam and method for making the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993007338A1 true WO1993007338A1 (en) | 1993-04-15 |
Family
ID=27118986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1992/008665 WO1993007338A1 (en) | 1991-10-11 | 1992-10-09 | Woven papermakers fabric having a unibody seam and a method for making the same |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0608342B1 (en) |
AT (1) | ATE131555T1 (en) |
AU (1) | AU2881892A (en) |
DE (1) | DE69206815T2 (en) |
NZ (1) | NZ244692A (en) |
WO (1) | WO1993007338A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1857588A1 (en) * | 2006-05-12 | 2007-11-21 | Voith Patent GmbH | Papermakers dryer fabric |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109183377A (en) * | 2018-11-28 | 2019-01-11 | 江西辉鹏实业有限公司 | A kind of joining method of radiation protection leggings |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3309790A (en) * | 1964-08-21 | 1967-03-21 | Fabric Res Lab Inc | Light-weight dryer felt seams |
US3335986A (en) * | 1965-09-01 | 1967-08-15 | Fabric Res Lab | Hand laced seams |
GB1259287A (en) * | 1967-12-22 | 1972-01-05 | ||
US4090897A (en) * | 1977-04-22 | 1978-05-23 | The Sinclair Company | Ultrasonic welding of thermoplastic fabrics |
WO1991019044A1 (en) * | 1990-06-06 | 1991-12-12 | Asten Group, Inc. | Papermakers fabric with flat machine direction yarns |
-
1992
- 1992-10-09 WO PCT/US1992/008665 patent/WO1993007338A1/en active IP Right Grant
- 1992-10-09 AT AT92922306T patent/ATE131555T1/en not_active IP Right Cessation
- 1992-10-09 EP EP92922306A patent/EP0608342B1/en not_active Expired - Lifetime
- 1992-10-09 AU AU28818/92A patent/AU2881892A/en not_active Abandoned
- 1992-10-09 DE DE69206815T patent/DE69206815T2/en not_active Expired - Fee Related
- 1992-10-12 NZ NZ244692A patent/NZ244692A/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3309790A (en) * | 1964-08-21 | 1967-03-21 | Fabric Res Lab Inc | Light-weight dryer felt seams |
US3335986A (en) * | 1965-09-01 | 1967-08-15 | Fabric Res Lab | Hand laced seams |
GB1259287A (en) * | 1967-12-22 | 1972-01-05 | ||
US4090897A (en) * | 1977-04-22 | 1978-05-23 | The Sinclair Company | Ultrasonic welding of thermoplastic fabrics |
WO1991019044A1 (en) * | 1990-06-06 | 1991-12-12 | Asten Group, Inc. | Papermakers fabric with flat machine direction yarns |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1857588A1 (en) * | 2006-05-12 | 2007-11-21 | Voith Patent GmbH | Papermakers dryer fabric |
Also Published As
Publication number | Publication date |
---|---|
NZ244692A (en) | 1994-10-26 |
EP0608342B1 (en) | 1995-12-13 |
AU2881892A (en) | 1993-05-03 |
ATE131555T1 (en) | 1995-12-15 |
EP0608342A1 (en) | 1994-08-03 |
DE69206815D1 (en) | 1996-01-25 |
DE69206815T2 (en) | 1996-05-23 |
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