JP2010031394A - Felt for making paper and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a felt for making paper, which can reduce a cost for making the paper, shorten a delivery date, and reduce vibrations on travelling in a paper-making machine and marks formed in products. <P>SOLUTION: The felt for making the paper has a base fabric obtained by joining a plurality of end-having woven fabric pieces to each other in the length direction, wherein the woven fabrics 11 are joined to each other in joining edge portions 12 extended in a direction inclined to the lateral direction. Especially, the joining edge portion of the woven fabric piece is formed to be inclined along the lateral direction along welts 22 arranged to be inclined relative to the lateral direction, and only warps 21 are joined to each other at the joining edge portion. In addition, the woven fabric piece is obtained by cutting an original woven fabric along a cutting line inclined relative to the lateral direction, and the cutting edge portion is formed as a selvage portion on a paper-making machine. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a papermaking felt in which a batt fiber layer is integrated with a base fabric layer having at least one base fabric obtained by joining a plurality of end woven fabric pieces in the length direction, and a method for producing the same. .

  The base fabric for papermaking felt is generally a bag weaving, that is, a method in which wefts on a paper machine are used as warp yarns (warp yarns) on the loom, and the warp yarns on the paper machine are used as end yarns on the loom for endless weaving. However, in this bag weaving, the warping width must be changed according to the length dimension, and when weaving base fabrics of various length dimensions, it takes time and effort to prepare. Since a process for correcting the crease of the part is required, there are problems that the manufacturing cost increases and the delivery time is prolonged.

In order to solve such a problem, the loops provided at the joining edges of the ends of the woven cloth pieces are engaged with each other through the core wire, and the warps and wefts of the joining edges are welded to each other by ultrasonic welding or the like. There is known a technique for manufacturing a base fabric by joining a plurality of end woven fabric pieces in the length direction by a joining method (see Patent Documents 1 and 2). In addition, a technique for manufacturing a base fabric having required width dimensions and height dimensions by winding a small long woven fabric in a spiral shape is known (see Patent Document 2).
JP 63-54840 A JP 2006-510812 A Japanese Patent No. 3027414

  However, in the configuration in which a plurality of end woven fabric pieces are joined in the length direction, when the joining portion extends straight in the width direction as in the past, the joining portion having different physical properties from the ground portion is formed in the nip portion of the press roll. Since a large amount of impact is generated at a time, the impact is increased and a large vibration is generated, and a mark is generated due to excessive pressure acting on the wet paper.

  The present invention has been devised in order to solve such problems of the prior art, and its main purpose is to reduce the manufacturing cost and the delivery time, and at the time of traveling in the paper machine. An object of the present invention is to provide a papermaking felt configured to reduce vibrations and marks generated in a product and a method for manufacturing the same.

  In order to solve such a problem, in the present invention, as shown in claim 1, a bat is applied to a base fabric layer having at least one base fabric obtained by joining a plurality of end woven fabric pieces in the length direction. In the felt for papermaking in which the fiber layers are integrated, the woven fabric pieces are bonded to each other at a bonding edge extending in a direction inclined with respect to the width direction.

  According to this, since a base fabric is manufactured by joining a plurality of end woven fabric pieces in the length direction, when weaving a base fabric of various length dimensions, such as bag weaving, Accordingly, the labor for changing the warping width and the process of correcting the crease of the ear are not required, so that the manufacturing cost can be reduced and the delivery time can be shortened.

  And since a joined part will be in the state extended in the direction inclined with respect to the width direction, since a joined part will approach into the nip part of a press roll gradually, an impact will become small and vibration will be reduced. The generation of marks can be suppressed by avoiding excessive pressure acting on the wet paper.

  In the papermaking felt, as shown in claim 2, the joining edge portion of the woven fabric piece is formed along a weft arranged inclined with respect to the width direction, and only the warp is formed at the joining edge portion. Can be configured to be joined to each other.

  According to this, since the wefts are not joined, it is possible to avoid the trouble that the joining state becomes messy, thereby avoiding the generation of the mark of the product and the reduction of the joining strength due to the joining failure. Further, since the weft is not cut in the width direction, it is possible to avoid problems such as the cut weft protruding from the felt surface and deteriorating the quality of the product.

  In the papermaking felt, as shown in claim 3, the woven fabric piece is formed of a raw fabric woven by weaving warp on a loom and using a warp on a loom as a driving yarn. The cutting edge portion is obtained by cutting with an inclined cutting line, and the cutting edge portion can be an ear portion on the paper machine.

  According to this, it is possible to easily obtain a woven fabric piece in which the wefts are arranged inclined with respect to the width direction and the joining edge portion is inclined with respect to the width direction along the wefts.

  Furthermore, the length direction of the original fabric is the width direction on the paper machine, the width direction of the original fabric is the length direction on the paper machine, and the width of the original fabric can be changed by changing the cutting position of the original fabric. A base fabric can be manufactured, and a base fabric of an arbitrary length can be manufactured by increasing or decreasing the number of pieces of woven fabric to be joined and appropriately cutting away. In addition, since the relationship between warp and weft is the same as that for bag weaving, weaving of the original fabric weaving from which the woven fabric pieces are based and general bag weaving are performed without changing the warp and weft. Can do.

  In this case, the ear portion of the raw fabric becomes the joining edge, but the raw fabric is cut along the lengthwise cutting line so that the entire length after joining is the required lengthwise dimension. In this case, the cutting edge portion by the lengthwise cutting line becomes the joining edge portion.

  In the papermaking felt, as shown in claim 4, the base fabric layer is composed of a base fabric obtained by joining at least two layers of the woven fabric pieces, and the number of wefts of these base fabrics. The density may be 6 lines / cm or less.

  According to this, it is possible to avoid the basis weight of the base fabric from becoming excessive, and in particular, the flexibility is ensured, so that the insertion property can be improved.

  In this case, for example, in a three-layer structure in which three single-woven base fabrics are overlapped, if the weft density of two layers of the base fabrics is half the normal density, the single-woven base fabric and the double-woven fabric are doubled. The weft yarn density can be equivalent to that of a general base fabric having a two-layer structure in which a woven base fabric is overlapped.

  In the papermaking felt, as shown in claim 5, the base fabric layer is composed of a base fabric obtained by joining the woven fabric pieces to each other at least two layers. It can be set as the structure arrange | positioned so that the inclination direction with respect to the width direction of the junction part of woven fabric pieces mutually reverses.

  According to this, since the inclination directions of the joint portions of the layers are opposite to each other, the yarns of the layers become so-called multiaxial base fabrics arranged in an X shape, which can improve the dimensional stability and running stability. it can. In addition, since the base fabric of each layer overlaps in a state where the yarns cross each other, a large opening can be secured and a decrease in water squeezing can be suppressed.

  In addition to this, the base fabric obtained by joining the woven fabric pieces to each other may have a configuration in which the joining portion is shifted in the length direction, thereby generating a mark generated in the product and vibrations when traveling in the paper machine. This can be further reduced.

  In addition, it is also possible to combine suitably the base fabric which consists of a non-joining textile fabric by a bag weave other than making the base fabric which comprises a base fabric layer into the base fabric which joined the woven fabric piece.

  Further, in the present invention, as shown in claim 6, papermaking in which a bat fiber layer is integrated with a base fabric layer having at least one base fabric obtained by joining a plurality of end woven fabric pieces in the length direction. In the manufacturing method of the felt for the above, in the cutting step obtained by cutting the raw woven fabric with a cutting line inclined with respect to the width direction to obtain an end-woven fabric piece, and the woven fabric piece obtained in this cutting step, A joining step of joining a plurality of pieces of the woven fabric to each other, using an edge portion that becomes an ear portion of the raw fabric cloth, or a cut edge portion of the raw fabric cloth cut along a lengthwise cutting line as a joining edge portion; It was supposed to have.

  According to this, the ends of the woven fabric pieces are joined to each other at the joining edge portion inclined with respect to the width direction, so that the joining portion extends in a direction inclined with respect to the width direction, and the inside of the paper machine is It is possible to reduce vibrations when traveling and marks generated on the product.

  Further, the joining edge portion of the end woven fabric piece is formed so as to be inclined with respect to the width direction along the wefts arranged to be inclined with respect to the width direction. Since the weft is not joined, the problem that the joining state becomes messy can be avoided, thereby avoiding the generation of product marks and the reduction in joining strength due to the joining failure. Further, since the weft is not cut in the width direction, it is possible to avoid problems such as the cut weft protruding from the felt surface and deteriorating the quality of the product.

  In the manufacturing method of the said felt for paper manufacture, as shown in Claim 7, it can be set as the structure which cut | disconnects the said raw fabric cloth by melt cutting in the said cutting process.

  According to this, when the raw fabric is cut, the warp and the weft are simultaneously heated and melted at the portion where the warp and the weft intersect, so that the warp and the weft are firmly joined to each other. Can be prevented from coming off and the unwinding of the yarn can be suppressed, thereby preventing problems such as damage to the paper machine caused by the unraveled yarn.

  As described above, according to the present invention, since the base fabric is manufactured by joining a plurality of end woven fabric pieces in the length direction, the manufacturing cost can be reduced and the delivery time can be shortened. And since a joined part will be in the state extended in the direction inclined with respect to the width direction, the vibration at the time of drive | working the inside of a papermaking machine, and the mark which generate | occur | produces in a product can be reduced. Furthermore, a base fabric having a desired size can be easily manufactured by joining the woven fabric pieces obtained by obliquely cutting the raw fabric fabric and joining them in the reverse direction. Moreover, by superimposing the base fabric of each layer so that the inclination directions of the joints are opposite to each other, the dimensional stability and running stability can be improved, and a large opening can be secured to suppress the reduction of water squeezing. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an example of a felt according to the present invention. This felt F is formed by laminating a batt fiber layer 2 on a base fabric layer 1 by needling, and the base fabric layer 1 is formed by superimposing first to third three base fabrics 3-5. It has a laminated structure. Each of the first to third base fabrics 3 to 5 is a single weave, and as shown below, a plurality of end woven fabric pieces are joined in the length direction to form an endless shape.

  FIG. 2 is a schematic perspective view showing the base fabric shown in FIG. The first base fabric 3 is formed in an endless shape by joining a plurality of end-woven fabric pieces 11 (three in this case) in the length direction. The joining edge portion 12 of each woven fabric piece 11 is inclined with respect to the width direction, and the joining portion 13 formed by joining the joining edge portions 12 of each woven fabric piece 11 to each other is formed in the width direction. It extends in the direction inclined with respect to. The second base cloth 4 and the third base cloth 5 shown in FIG. 1 are the same as the first base cloth 3.

  FIG. 3 is a schematic plan view showing the main part of the base fabric shown in FIG. 2, wherein (A) shows a state before joining, and (B) shows a state after joining. In the woven fabric piece 11 with ends, the warp yarn 21 and the weft yarn 22 are arranged obliquely with respect to the length direction and the width direction, and the joining edge portion 12 is formed obliquely with respect to the width direction along the weft yarn 22. ing. At the joining edge 12, only the warp 21 is cut, and only the warp 21 is joined together. Moreover, in the ear | edge part 14 located in the edge of the width direction, the warp yarn 21 distribute | arranged diagonally with respect to the length direction is in the state cut | disconnected on the way.

  FIG. 4 is a schematic diagram for explaining the inclination angle of the joint portion of the base fabric shown in FIG. If the joint portion 13 extends in a direction inclined with respect to the width direction, the joint portion 13 does not enter the nip region 42 (the region press-contacted with the felt F) 42 of the press roll 41 at a time. And the occurrence of marks can be suppressed by avoiding excessive pressure acting on the wet paper.

  Here, as the inclination angle α with respect to the width direction of the joint portion 13 increases, the width W1 at which the joint portion 13 enters the nip region 42 of the press roll 41 at a time decreases, and the impact decreases accordingly. Therefore, the inclination angle α of the joint portion 13 may be set so as to obtain a required effect according to the width Wf of the felt F and the nip width Wn of the press roll 41. In particular, the inclination angle α of the joint 13 is preferably 30 ° or less. When the inclination angle α of the joint portion 13 (weft 22) is larger than 30 °, the felt F stretches in the length direction due to the tensile force in the length direction and simultaneously shrinks in the width direction, so-called inconvenience that the so-called width exceeds the allowable limit occurs. .

  FIG. 5 is a schematic view showing a procedure for manufacturing the base fabric shown in FIG. The end woven fabric piece 11 is obtained by cutting the raw fabric 52 woven by the loom 51 with a cutting line inclined with respect to the width direction, and the cutting edge formed by this cutting is in a completed state. When the woven fabric piece 11 is joined at the joining edge portion 12, the woven fabric piece 11 is aligned so that the ear portion 14 is in a straight line.

  Also, here, the ear 53 on the loom becomes the joining edge 12, but when the raw fabric 52 is cut by a cutting line in the length direction so that the whole in the completed state has a required length. The cutting edge portion of the cutting line in the length direction becomes the joining edge portion 12.

  The loom 51 is a so-called sulzer loom having a configuration in which a thread material wound around a bobbin 55 is gripped by a gripper 56 and passed through a shed. The warp yarn on the loom 51 in a completed state. 21 and the warp yarn (warping yarn) on the loom 51 becomes the weft yarn 22 in the completed state (see FIG. 3).

  FIG. 6 is a plan view showing in detail the joining state of the woven fabric pieces shown in FIG. Here, in order to join the joining edge portions 12 of the two woven fabric pieces 11 to each other, only the warp yarns 21 formed by removing the required number of wefts 22 from the ends of the joining edge portions 12 are mutually connected. The bridging yarn 61 is arranged in parallel to the weft yarn 22 in a manner of being overlapped with each other and laid on the warp yarn 21, and the bridging yarn 51 and the warp yarn 21 are ultrasonically welded.

  FIG. 7 is a plan view showing in detail an ear portion of the base fabric shown in FIG. In the ear portion 14 of the woven fabric piece 11 obtained by cutting the raw fabric cloth 42, the warp yarn 21 and the weft yarn 22 are cut obliquely so that the portions where the warp yarn 21 and the weft yarn 22 intersect each other are spaced apart from each other. And appear. Here, when the raw fabric 42 is cut using a heat cutter (heat-melting cutter, ultrasonic cutter, etc.) that melts and cuts the yarn, the warp yarn 21 and the weft yarn 22 are the portions where the warp yarn 21 and the weft yarn 22 intersect. Are simultaneously heated and melted, whereby the warp yarn 21 and the weft yarn 22 are firmly bonded to each other. In the melt-bonded portion 71, the warp 21 and the weft 22 are prevented from coming off, and the warp 21 and the weft 22 can be prevented from being unwound.

  Note that the above-mentioned melt bonding is sufficiently effective in preventing the ears 14 from being unwound, but in order to further strengthen, the ears 14 are filled with a liquid synthetic resin material, or a sheet (film-like) The resin processing such as affixing the synthetic resin material (2) may be additionally performed.

  FIG. 8 is a schematic perspective view showing an example of the overlay of the base fabric shown in FIG. Here, the two base cloths 4 and 5 are overlapped so that the inclination directions with respect to the width direction of the joint portion 13 are opposite to each other. As a result, it is possible to avoid the joint portions 13 of the two base fabrics 4 and 5 from being overlapped as a whole, so that it is possible to reduce vibrations when traveling in the papermaking machine and to suppress marks generated in the product.

  Thus, in order to reverse the inclination direction of the joint portion 13 with the two base cloths 4 and 5, the two base cloths 4 and 5 are similarly manufactured in the manner shown in FIG. What is necessary is just to reverse the front and back.

  FIG. 9 is a plan view showing in detail a state in which the two base fabrics shown in FIG. 8 are overlapped. As shown in FIG. 9A, the two base fabrics 4 and 5 are overlapped so that the inclination directions with respect to the width direction of the joint portion 13 are opposite to each other, so that the warp yarn 21 and the weft yarn 22 are inclined. The directions are also opposite to each other with the two base fabrics 4 and 5, the warps 21 of the base fabrics 4 and 5 are arranged in an X shape, and the wefts 22 of the base fabrics 4 and 5 are arranged in an X shape. Thus, the so-called multiaxial base fabric is obtained, and the dimensional stability and running stability are improved.

  Here, as shown in FIG. 9B, when the warp 93 and the weft 94 are not inclined with respect to the width direction by the two base fabrics 91 and 92, the two base fabrics 91 and 92 are When one opening (gap between yarns) overlaps so that the other thread closes, the opening as a whole becomes narrow, and when the two base fabrics 91 and 92 overlap so that their openings are aligned, The state of the opening as a whole hardly changes, and there arises a disadvantage that the state of the opening as a whole greatly changes according to the positional relationship between the opening of each of the two base fabrics 91 and 92 and the yarn.

  On the other hand, as shown in FIG. 9A, when the warp yarn 21 and the weft yarn 22 are inclined and the inclination directions of the two base fabrics 4 and 5 are opposite to each other, the two base fabrics 4 and 5 are Since the yarns overlap each other in an intersecting state, the overall opening is not so narrow, and the overall opening state is large depending on the positional relationship between the respective openings of the two base fabrics 4 and 5 and the yarn. There is no change.

  In addition, when producing a base fabric by spirally winding a long woven fabric, there is a limit to taking a large inclination angle, but here, the inclination angle can be arbitrarily set, In consideration of the design conditions of the base fabric (number density of yarns) and the like, it may be set to an appropriate inclination angle that provides a sufficient opening. In general, the inclination angle β (= α) with respect to the length direction (traveling direction) of the warp yarn 21 is ± 10 ° to ± 22.5 °, and the relative angle of each warp yarn 21 of the two base fabrics 4 and 5 is set. When the angle is 20 ° to 45 °, a large opening can be secured.

  In addition, a normal base fabric in which warps and wefts are arranged in the length direction and the width direction is overlapped on the two base fabrics 4 and 5 in which the inclination directions of the warp yarn 21 and the weft yarn 22 are opposite to each other as described above. It is also possible to match them, and in this way, the direction of the yarn is further increased, so that the dimensional stability and running stability can be further improved.

  FIG. 10 is a schematic side view illustrating an example of the overlay of the base fabric illustrated in FIG. 1. Here, the three base fabrics 3 to 5 are overlapped so that the joint portion 13 is arranged in the length direction with the three base fabrics 3 to 5. According to this, since the joining parts 13 are separated from each other, the influence of the joining parts 13 can be dispersed, and vibrations when traveling in the paper machine and marks generated in the product can be reduced.

  FIG. 11 is a front view showing a joining device used for joining the woven fabric pieces shown in FIG. 5. FIG. 12 is a top view showing a work situation by the joining apparatus shown in FIG. As shown in FIG. 11, this joining apparatus 111 sandwiches a joining edge 12 of a woven fabric piece 11 between a head 112 having an ultrasonic transducer and a horn and an anvil 113, and joins the joining edge 12. The warp yarns of the joining edge portion 12 are welded by applying ultrasonic vibration while pressing, and a plurality of joining units 114 including the head 112 and the anvil 113 are provided depending on the number of joining portions of the woven fabric piece 11. (In this case, three units) are provided side by side.

  The joining unit 114 moves along a guide rail 115 extending on the floor surface, and the head 112 moves relative to the body of the joining unit 114 as shown in (i) to (iv) in FIG. The head 112 is moved forward and backward from the last retracted position (i) for each welding operation to shift the welding position step by step, and the head 112 is further moved to the most advanced position (iv). When it reaches, the entire joining unit 114 is advanced to weld the next welding location, and the joining operation is advanced by repeating the forward movement of the head 112 and the forward movement of the joining unit 114.

  In addition, as shown in FIG. 11, in this joining device 111, an accommodation unit 116 that accommodates the woven fabric piece 11 in a state of being wound around a winding shaft is provided in the joining unit 114 so that the woven fabric piece 11 is not bulky. It is provided in between. Further, in order to guide the other joining edge 12 of the fabric piece 11 to which one joining edge 12 is joined by the joining unit 114 located at the end to the joining unit 114 located at the opposite end, the fabric piece. 11 is wound around a pair of guide rollers 117 and is passed over the joining unit 114.

  FIG. 13 shows a specific example of the base fabric shown in FIG. The first base fabric of the upper layer is a 5/1 break weave, and the second base fabric of the intermediate layer and the third base fabric of the lower layer are plain weave.

  As the warp of the upper first base fabric, a twisted yarn in which two filaments having a diameter of 0.2 mm are twisted is used. For the warp of the second base fabric of the intermediate layer and the third base fabric of the lower layer, a twisted yarn obtained by twisting three twisted yarns obtained by twisting two filaments having a diameter of 0.2 mm is used. For the wefts of the first base fabric of the upper layer, the second base fabric of the intermediate layer, and the third base fabric of the lower layer, a twisted yarn in which two twisted yarns obtained by twisting two φ0.2 mm filaments are further twisted Used.

  Laminated base fabrics generally have a two-layer structure in which a single woven base fabric is placed on the upper side and a double woven base fabric on the lower side. In this case, the weft density of each base fabric is Assuming 8 yarns / cm, the weft density of the entire base fabric is 16 yarns / cm.

  On the other hand, this base fabric has a three-layer structure in which three single-woven base fabrics are stacked to ensure high strength, and the number of weft yarns is avoided in order to avoid excessive base fabric weight. The density is set lower than before. That is, the weft density of the first base fabric of the upper layer affects the smoothness of the papermaking surface, so it is set to 8 / cm as usual, and the second base fabric of the intermediate layer and the second base fabric of the lower layer The weft density of the base fabric No. 3 is set to 4 / cm, which is half of the conventional density, so that the weft density of the entire base fabric can be set to 16 / cm as usual.

  When at least two layers are formed of the base fabric obtained by joining the woven fabric pieces to each other in this way, the weft density of the base fabric is made smaller than usual, preferably the weft density is 6 / It is good to make it cm or less. This prevents the basis weight of the base fabric from becoming excessive, and in particular, the flexibility is ensured, so that the insertion property can be improved.

  FIG. 14 is a plan view showing the state of the opening when the yarn density is not uniform. In the base fabric, there is a slight difference in the number density of yarns depending on the part, which is not uniform. For this reason, as shown in FIG. 14A, when the warp and weft are not inclined with respect to the width direction in the two base fabrics, The aperture ratio varies depending on the position, and a portion having a low aperture ratio and a portion having a high aperture ratio are generated. Thus, if the aperture ratio is non-uniform, the uniformity of squeezing will be impaired. In particular, the influence of warps having a large yarn diameter is large, warp-like squeezed spots extending in the advancing direction (length direction) are generated, and the warp direction streaks appear on the paper.

  On the other hand, as shown in FIG. 14B, when the warp and weft are inclined and the inclination directions are opposite to each other with two base fabrics, the number density of the yarns is two base fabrics. When the yarns are superposed, the influence on the overall aperture ratio is small, and even if the yarn number density is not uniform, the aperture ratio is substantially uniform and does not become warped stripes.

  FIG. 15 is a plan view showing interference fringes generated when the inclination angle of the yarn is small. As described above, when producing a base fabric by spirally winding a woven fabric having a small width, there is a limit to increasing the inclination angle of the yarn, but when the inclination angle of the yarn is small as described above, In many cases, when two base fabrics are overlapped, an interference fringe in which a band-like region A having a low aperture ratio appears periodically is in the width direction as shown in FIG. 15A or in FIG. ) As shown in FIG.

  Such non-uniformity of the opening ratio adversely affects the mobility of the fibers in the needle punching process in which the bat fiber layer is integrated with the base fabric. In addition to the nonuniformity of the rate, the influence of the nonuniformity of the fiber density makes it easy to generate squeezed spots and to cause vibration. On the other hand, in the present invention, the inclination angle of the yarn can be arbitrarily set, and can be set to a sufficiently large inclination angle without causing nonuniformity of the aperture ratio and fiber density.

  The papermaking felt and the manufacturing method thereof according to the present invention have the effects of reducing the manufacturing cost and shortening the delivery time, and reducing vibrations and marks generated on the product when traveling in the papermaking machine. It is useful as a press felt used in a press part (pressing part) of a paper machine or a dryer felt used in a dry part (drying part).

It is sectional drawing which shows an example of the felt by this invention. It is a typical perspective view which shows the base fabric shown in FIG. It is a typical top view which shows the principal part of the base fabric shown in FIG. It is a schematic diagram explaining the inclination-angle of the junction part of the base fabric shown in FIG. It is a schematic diagram which shows the point of manufacture of the base fabric shown in FIG. It is a top view which shows in detail the joining condition of the woven fabric piece shown in FIG. It is a top view which shows in detail the ear | edge part of the base fabric shown in FIG. It is a typical perspective view which shows an example of the superimposition of the base fabric shown in FIG. It is a top view which shows in detail the state which piled up the two base fabrics shown in FIG. It is a typical side view which shows an example of the superimposition of the base fabric shown in FIG. It is a front view which shows the joining apparatus used for joining of the woven fabric piece shown in FIG. It is a top view which shows the work condition by the joining apparatus shown in FIG. It is a figure which shows the specific example of the base fabric shown in FIG. It is a top view which shows the state of opening when the number density of a thread | yarn is non-uniform | heterogenous. It is a top view which shows the interference fringe which arises when the inclination | tilt angle of a thread | yarn is small.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base fabric layer 3-5 Base fabric 11 Woven cloth piece 12 Joint edge part 13 Joint part 14 Ear part 21 Warp yarn 22 Weft 51 Weaving machine 52 Original fabric cloth 53 Ear part 71 Melt joint part 111 Joining device 112 Head 113 Anvil 114 Joining Unit 115 Guide rail 116 Housing unit 117 Guide roller

Claims (7)

A felt for papermaking in which a batt fiber layer is integrated with a base fabric layer having at least one base fabric obtained by joining a plurality of end woven fabric pieces in the length direction,
The papermaking felt, wherein the woven fabric pieces are joined to each other at a joining edge extending in a direction inclined with respect to the width direction.   The joining edge part of the said woven fabric piece is formed so that the weft arranged with inclination with respect to the width direction may be formed, and only the warp is joined mutually in the said joining edge part. Papermaking felt as described in 1.   The woven fabric piece is obtained by cutting a raw fabric woven using weft yarn as a warp on a loom and warp yarn as a driving yarn on a loom by a cutting line inclined with respect to the width direction. The papermaking felt according to claim 2, wherein the cutting edge portion is an ear portion on the papermaking machine.   The base fabric layer is composed of a base fabric obtained by joining the woven fabric pieces to at least two layers, and the weft density of these base fabrics is 6 / cm or less. The papermaking felt according to any one of claims 1 to 3.   The base fabric layer is composed of a base fabric obtained by joining at least two layers of the woven fabric pieces to each other, and these base fabrics are inclined with respect to the width direction of the joint portion between the woven fabric pieces. The papermaking felt according to claim 2 or 3, wherein the felts are arranged in opposite directions. A method for producing a felt for papermaking in which a batt fiber layer is integrated with a base fabric layer having at least one base fabric obtained by joining a plurality of end-woven fabric pieces in the length direction,
A cutting step of cutting the raw fabric with a cutting line inclined with respect to the width direction to obtain a piece of woven fabric with ends;
In the woven fabric piece obtained in this cutting step, an edge portion that becomes an ear portion of the raw woven fabric, or a cutting edge portion obtained by cutting the raw woven fabric with a cutting line in the length direction is used as a joining edge. A method for producing a felt for papermaking, comprising a joining step of joining the woven fabric pieces together.   The method for manufacturing a papermaking felt according to claim 6, wherein in the cutting step, the raw fabric is cut by melt cutting.

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