JP2003096686A - Joint for needle canvas for papermaking use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the interlace bonding between a base fabric and a nonwoven fabric layer at a joint part, maintain the surface character of the joint part at a high level equivalent to that of a needle canvas body through preventing joining loops from deformation and elongation, and to raise the rigidity of the joint part. SOLUTION: The objective joint is characterized in that at the end of the base fabric 10 of 2.5-fold weave design comprising warps 11, wefts 12 (13 and 14) and wefts 15 as an intermediate layer, loops 20 are formed by folding back the warps 11 and additional wefts 21 are woven-in among the wefts 15 as the intermediate layer to make a triple weave design 50, and a single equivalent of the wefts (14) is each woven in the base fabric body side and the joint end side from each of positions 31 facing on the end of extending warps 32 on the joint end side and the end of extending warps 33 on the base fabric body side to effect interlacing the nonwoven fabric layer 60 on at least contact paper surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle canvas joint for papermaking, in which a woven cloth is provided with a joint, the woven cloth is used as a base cloth, and a web is laminated thereon and needling.

[0002]

2. Description of the Related Art Needle canvases for papermaking, in which web fibers are laminated on a base fabric and entangled and integrated by needle punching, require high quality standards such as high-quality paper and base paper for coating due to its adhesion to wet paper and cushioning properties. It is widely used as a dryer canvas in the drying section of paper manufacturing machines including the fields mentioned above. A papermaking dryer canvas is generally manufactured as an endless belt, and after being put on a papermaking machine, joints at both end portions in the length direction are joined to form an endless belt. Therefore, the joint should be easy to join and should have the same characteristics as the canvas body, such as flexibility, thickness, air permeability, and surface smoothness, so as not to adversely affect the paper sheet such as marks. Is required.

That is, in order to make the joint portion have the same characteristics as the canvas body, the joint portion of the base cloth is composed of the base cloth body and the woven structure,
The constituent yarns and the densities are not the same, and it is necessary to have the woven structure, the constituent yarns and the densities such that when the synthetic fiber webs are laminated and needling, they have characteristics equivalent to those of the needle canvas body. For such a base fabric joint, the technique of a woven canvas joint in which webs are not laminated can be utilized. A typical example thereof is a so-called warp loop seam in which a loop for joining is formed by an extended warp of a base cloth and is re-stitched on the main body of the base cloth, and a prior art thereof is, for example, Japanese Utility Model Publication No. Sho 51-464.
There is an 83 publication.

To form the joint, industrially, for example, as disclosed in Japanese Utility Model Laid-Open No. Sho 63-19600, the weft yarns at the ends of the base fabric body are removed and the warp yarns are loosened into tufts. Then, set both ends of the canvas on a joint processing machine where wefts are prepared, form loops for joining and presser threads of the tip weft from tufted extended warp yarns, fold them back and weave the joint ends To be done.

Further, in an end-shaped needle canvas made of a woven cloth having warp loop seams as a base cloth, for example, as described in Japanese Utility Model Publication No. 57-55358, the joint portion of the base cloth is joined. Or, interposing an interstitial fabric between the joint portions of the base fabric, laminating a fibrous web on both sides or one side thereof, and entangled and integrated by needle punching,
The web of the joint is cut open and a joining loop is created.

[0006]

The warp loop seam has the same surface property and air permeability of the joint portion of the base cloth as that of the main body of the base cloth, and even in the needle canvas after the needling of the web fibers, the joint portion and the canvas are formed. Although it is often used because it is almost the same as the main body, the joint part is formed by removing the weft yarn from the end of the base fabric main body and loosening it in tufts to form a joining loop as described above. It is generally performed by forming and folding back the extended warp and weaving the removed weft and / or the newly prepared weft using a joint processing machine. In this case, weaving tension and driving force in the joint processing machine are used. Is weaker than canvas loom, the extension warp in the formed joint intersects with the weft. The degree of connection between the extension warp and the weft at the knuckle is the same as that of the base fabric body. It requires a high degree of technology to.

Further, extended warp yarns on the joint side, which are extended to form a joining loop or wound at the tip end and folded back to the base fabric side and woven again with the woven structure of the base fabric body, are opposed to each other. With the extended warp yarns on the side of the base fabric, the warp yarns near the separated yarn ends are more easily loosened.

Particularly, a large load is concentrated on the extended warp on the base fabric side forming the joining loop, that is, the loop forming extended warp, so that the loop may be deformed or extended depending on the use condition. There is a risk. Further, the deformation or extension of the joining loop may cause deterioration of the surface property of the joint portion, which may adversely affect the quality of the paper sheet product.

In order to mitigate the deformation of the joining loop, for example, in Japanese Utility Model Laid-Open No. 1-168598, as shown in FIG. 4, the warp yarns 11 (18, 19) and the weft yarns 12, that is, the weft yarns 13 on the surface layer and the back layer are used. In the base fabric 10 in which the weft yarn 14 of FIG. 1 is woven, another weft yarn 21 is added to the intermediate layer before and after the first design point where the loop forming extended warp yarn 18 intersects with the warp yarn 181 before forming the loop 20 at the joint end. Then
Moreover, it has been proposed to remove the wefts 131 and 141 on the front and back layers at the ends.

However, in this proposal, the weft yarn 21 is not added to the intermediate layer on the side of the base fabric body after the added joint end, and the tension applied to the loop forming extension warp 18 intersects with the added weft yarn 21. Since it is also transmitted to the base fabric side after the point where the loop forming extended warp 18 extends, the loop forming extended warp 18 presses the front layer and back layer wefts 13 and 14 in the direction of the intermediate layer to extend or deform the loop forming extended warp 18. It has not reached the point where there is no danger of it occurring.

Industrially, the needle canvas joint for papermaking has an endless shape by inserting a core wire into the joint portion of the base cloth and joining them as described in Japanese Utility Model Publication No. 57-55358. The fiber web is laminated on both sides or one side, and after being entangled and integrated by needle punching, the core wire is pulled out, the joint portion is separated, and a joining loop is created. The base fabric main body and the base fabric joint are processed under the same conditions, but the condition of the entanglement between the fibrous web and the base fabric is influenced by the condition of the base fabric, and for example, the warp and the weft of the base fabric are mixed. When the degree of bonding due to is partially weak, the entanglement adhesiveness between the base fabric and the non-woven fabric layer may be partially weakened. Also, if the degree of bonding due to the crossing of the warp and weft of the base cloth is weak, the extended warp loosens near the separated yarn end, or the rigidity of the joint part weave becomes low, and deformation or waviness is likely to occur. Become.

In order to reinforce the entanglement adhesiveness between the base fabric and the non-woven fabric layer of the joint portion, for example, when the warp is a monofilament yarn as described in Japanese Utility Model Laid-Open No. 62-114098,
A needle canvas that strengthens the bonding force between the base cloth and the non-woven fabric layer by splicing other short threads such as spun threads on both sides of the base cloth on the paper contact side and projecting the ends to the felt layer forming surface side. I have a suggestion. However, it is not possible to use it in an actual process because it takes a lot of time and effort to bind the separate yarn and it causes trouble in weaving of the base cloth joint portion.

As described in Japanese Utility Model Laid-Open No. 22322/1990, in order to enhance the degree of bonding between the extended warp and the weft of the joint portion, the weft thread forming the joint portion is rich in surface elasticity, For example, when using a core-sheath type multiplast yarn, the surface properties and rigidity of the weft yarn and the yarn of the base fabric body are different, the resin of the sheath part is peeled off when weaving the joint part, and with the same density as the base fabric body. The warp and weft cannot be textured, not only the surface property of the base fabric, but also the resistance when the web is laminated and needling, and the needle hooks the web on the barb (protrusion) and inserts it into the base fabric. The warp or weft of the base fabric, especially the weft, is flexibly deformed, and the needling joint has a property different from that of the canvas body, resulting in poor surface property or waviness.

Therefore, an object of the present invention is to make the entanglement adhesiveness between the base cloth and the non-woven fabric layer in the joint portion uniform, prevent deformation and extension of the joining loop, and prevent the joint portion from being deformed. To provide a needle canvas joint for papermaking, in which the surface texture of the paper is maintained at a high level equivalent to that of the needle canvas body and the rigidity of the joint is increased.

[0015]

In order to solve the above-mentioned problems, the present invention has the following constitution. That is, according to the present invention, two layers of weft yarns using synthetic monofilament yarns as warp yarns and at least one weft yarn positioned on the paper contact surface side or the non-paper contact surface side are used.
In a needle canvas composed of a base fabric having a woven structure of layers and a non-woven fabric layer in which synthetic fiber webs of short fibers are entangled by needle punching, an extended warp obtained by removing the weft yarn at the end of the base fabric forms a loop. As the extended warp and the leading end weft pressing extended warp, a loop forming extended warp forms a joining loop, and the extended warp is folded back and woven with the weft arranged at the end of the base fabric to form a weave structure of the base cloth joint portion. Is a weft design with 2.5 or 3 layers of wefts having an intermediate layer of wefts, which is made of spun twisted synthetic fibers. (Claim 1)

Further, in the base cloth joint portion, a weft yarn in a layer on the paper contact surface side and / or the non-contact paper surface side, which is woven with the joint side extended warp and the base cloth side extended warp, is attached to the base cloth main body. It is characterized by using threads having different shapes and / or materials and / or fineness. (Claim 2)

In addition, the extended warp on the joint side folded back at the base cloth joint portion and the extended warp on the base cloth side opposite to the warp are opposed to each other. It is characterized in that it is designed with extra wefts more than this amount. (Claim 3)

Furthermore, a resin is applied and impregnated on a portion of the weave of 2.5 layers or 3 layers of the weft of the base cloth joint portion to cure the resin. (Claim 4)

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is based on a two-layer or 2.5-layer weft design in which monofilament yarns of synthetic fiber are used as warp yarns and at least one weft yarn side located on the paper contact side or non-paper face side. In a needle canvas composed of a cloth and a non-woven fabric layer in which synthetic fiber webs of short fibers are entangled by needle punching, an extended warp obtained by removing the weft yarn at the end of the base fabric is looped As an extended warp, a loop is formed from a loop forming extended warp, the extended warp is folded back, and the weft of the base fabric joint portion formed by weaving with the weft yarn arranged at the end of the base fabric is formed into a synthetic fiber span. It is configured so as to have a weft design of 2.5 or 3 layers of wefts having an intermediate weft layer composed of twisted wefts.

Here, the woven structure of the base cloth is often used for the woven cloth of the dryer canvas for papermaking and the base cloth of the needle canvas, as shown in FIG.
An explanation will be given by taking as an example the base fabric 10 of the back 3/1 torn and double weave.
As described above, the base fabric 10 has a diameter thread 11 (18, 1).
9) and the weft 13 of the front layer and the weft 14 of the back layer are woven.

The wefts 13 and 14 at the ends of the main body of the base fabric 10 are removed, the warp 11 is loosened into tufts, and both ends of the canvas are set in a joint processing machine in which the wefts are prepared. As the warp, the loop forming warp and the front weft pressing extension yarn are formed, the joining loop is formed by the loop forming extension warp, the extension warp 18 is folded back, and the extension warp 18 is used as an additional weft 21 of the intermediate layer, as shown in FIG. Table 1 shown in B)
/ 3 torn and oblique back / 3/1 torn and oblique weft 3 Joint part 2 of double weave
0, or front 1/3 torn, italic, back 3 shown in FIG. 2 (C)
/ 1 Tear italic weave 2.5 Weave the joint portion 30 of the double weave.

The weft yarn layers on the paper contact side and the non-paper contact side are
The weave structure of the base cloth joint portion is set to 2.5 layers of weft yarns or 3 layers of weft yarns by a weaving machine, the fibrous webs are laminated, and the characteristics of the joint portion after needle punching are the same as those of the canvas body portion. Configure so that there is no difference. A spun twisted yarn is used as the weft yarn 21 added as an intermediate layer, which is not present in the main body of the base fabric 10. Since the joint portions 20 and 30 are formed by the weaving structure in which the intermediate layer weft yarn 21 made of spun twisted yarn, which is not present in the base fabric 10 body woven by the canvas loom, is added, the warp yarn 11 and the weft yarns 13 and 14 are formed. A base cloth joint portion is formed in which the degree of connection by crossing is secured.

The degree of connection of the warp yarns 11 and the weft yarns 13 and 14 in the base cloth joint portions 20 and 30 depends on the degree of connection.
Since it is the same as 0, the base cloth joint part is also extended warp 18
Is woven by adding the weft yarns 21 to the intermediate layer and laminating the fibrous web on the base fabric 10 including the base fabric joint portion and entangled by needle punching, the base fabric 10 and the non-woven fabric layer are combined. In the entanglement adhesiveness of 1, the entire base fabric 10 including the joint portions 20 and 30 is hardly loosened, and the non-woven fabric layer is not peeled off or the web fibers are not peeled off. further,
The tension for concentrated application to the loop-forming extended warp forming the joining loop during use does not cause the joining loop to extend or deform. In addition, the weft 21
Is added to enhance the rigidity of the woven structure of the joint, so that waviness due to deformation of the joint does not occur. The “base cloth joint portion” in the present invention means a joint portion formed by weaving the base cloth in the joint processing step.

FIG. 2 (B) shows that the weft 21 is added by folding back the extended warp to all the intermediate layers of the front 1/3 torn / back 3/1 torn / wet double weave of FIG. 2 (A). It is a conceptual diagram of the joint part 20 used as a weft triple woven fabric. In addition, in FIG.
The weft yarn 21 with an X mark inside is an additional weft yarn, and the same applies to the following embodiments and examples, although not described one by one.

FIG. 2 (C) shows the front 1/3 torn / back 3/1 torn / wet weft of FIG. 2 (A) 1 in the middle layer of the double weave base fabric 10.
It is a conceptual diagram of the joint part 30 which made the weft 2.5 double woven fabric by adding the weft 21 to this book. In addition to the above, Table 2/2
It is also applicable to the back 3/1 weft double weave or 2.5 double weave torn or regular weave design.

In addition to the two-layer woven fabric 10 shown in FIG. 2A, weft yarns 15 are provided in every other intermediate layer.
Front 1/3 torn oblique / back 3/1 torn oblique weft shown in FIG. 2 (D) 2.5 Weave cloth 40 or front 1/3 regular oblique / back 3 /
It can also be applied to the base cloth of 1 regular weft double weave and 2.5 weft weave.

FIG. 2 (E) shows the front 1/3 torn / back 3/1 torn / oblique weft of FIG. 2 (D), where the weft 15 is not present in the intermediate layer of the base fabric 40 of the 2.5 woven fabric. FIG. 3 is a conceptual diagram of a joint portion 50 in which a weft yarn 21 for a joint is added to form a triple weft weft. In this case, the preceding weft yarn 15 is replaced with the same yarn as the added weft yarn 21. Further, the weft yarn 15 that is first in the intermediate layer can be a weft triple weave without replacing it with another yarn.

The weft yarns (15, 21) in the intermediate layer are spun twisted yarns added or replaced with spun twisted yarns. The spun twisted yarns to be added or replaced are spun twisted yarns after the fiber webs are laminated and needle punched and entangled. But,
As long as there is no difference in characteristics from the canvas body, the same yarn as the spun twisted yarn used for the base fabric body may be used, or a different yarn may be used. Material is acrylic, polyester, PPS
(Polyphenylene sulfide) can be used, but acrylic yarn is preferable in terms of cost and steam resistance. The fineness of the monofilament yarn used on the paper-bonding surface side and / or the non-paper-bonding surface side of the base fabric body is 1/2 times or less in the constant-length type fineness, and for the spun yarn and the multifilament yarn. Is preferably 1 time or less.

Further, in carrying out the present invention, in the base cloth joint portion, in the weft yarn of the layer on the paper contact surface side and / or the non-contact paper surface side which is woven with the joint side extended warp and the base cloth side extended warp, Threads having a different form and / or material and / or fineness from the base fabric body can be used.

That is, as the weft yarns on the paper contact surface side and the non-contact paper surface side of the base cloth joint portion, weft threads removed from the base cloth or newly prepared weft threads having the same shape, material and fineness may be used. Further, as the weft yarns on the paper-contacting surface side and the non-paper-contacting surface side, yarns having a different form and / or material and / or fineness from the base fabric body can be used. For example, when an acrylic spun twisted yarn is used for one layer of weft yarns on the paper contact surface side or the opposite paper contact surface side, the weft yarns in that layer can be replaced with monofilaments. In that case, the weft yarn is selected so that the characteristics of the joint portion, for example, the surface smoothness and the air permeability are equivalent to those of the canvas body. When such a selection is made, since the surface smoothness and air permeability of the joint portion are equivalent to those of the canvas body, uneven drying and marks are not generated on the sheet.

In the practice of the present invention, the extended warp on the joint side and the extended warp on the base cloth side facing the extended warp on the joint side folded back at the joint portion are further opposed to each other on the opposite contact surface side. 1 or more wefts, preferably 1
It is constructed by weaving 3 extra yarns.

Normally, as shown in FIG. 3 (A), the extended warp 32 from the joint end side on the side opposite to the paper surface (BS).
And at the location 31 where the extended warp 33 on the base fabric body side is facing,
Each warp yarn 32, 33 is cut at a position slightly recessed from the surface of the base cloth.

However, in the present invention, as shown in FIG. 3 (B), for example, the extended warp threads 32 from the joint end side are located further toward the base cloth body side than the portion 31 facing the extended warp threads 33 on the base cloth body side. One extra weft (14) is woven and cut at a position slightly recessed from the surface of the base cloth on the non-contact side (BS).
The extension warp 33 on the base fabric body side is also a weft yarn on the joint end side further than the portion 31 facing the extension warp 32 from the joint end side.
(14) Make an extra texture for one piece, and cut at a position slightly recessed from the surface of the base cloth on the side opposite to the paper surface (BS). With such a configuration, as compared with the case of FIG. 3 (A), the respective extended warp yarns 32, 33 are further constructed by one or more extra weft yarns 14 than the main body woven structure. Part 34,
34 does not loosen easily.

The extending warp yarns 32 and 33 are opposed to each other at a point 31.
Are preferably dispersed and arranged in the warp direction so as not to concentrate at a specific position. Even if the fibrous web is laminated on the base cloth including the joint portion and entangled by needle punching, there is almost no loosening from the warp cutting yarn end portion 34. Further, the extended warp hardly slackens from the cut yarn end portion 34 even during use, and the slack of the extended warp spills over to the knuckle portion 35 due to the intersection with the weft yarn 13 on the paper contact surface side (PS), and the knuckle portion 35.
Does not protrude excessively to form marks on the wet paper and impair the quality of the paper.

Further, as shown in FIG. 3 (C), only the extended warp threads 32 from the joint end side have an extra design from the facing point 31 by one weft thread (14) or more, and There is also a method of yarn end treatment of the extended warp yarns 32 and 33 in which the extended warp yarns 33 are further separated from the weft yarns at the facing portion 31 without forming a texture.

Further, as shown in FIG. 3D, there is also a method of designing two or three wefts (141, 142) more than the facing portion 31. However, the yarn end treatment method shown in FIG. 3 (B) is most preferable from the viewpoint of preventing looseness of the warp cut end portion.

In addition, in a more preferred embodiment of the present invention, a resin is applied and impregnated on a portion of the weave of 2.5 layers or 3 layers of weft of the base cloth joint portion to be cured.

That is, after weaving the base cloth joint portion with 2 or 2.5 layers of wefts, spun twisted yarns were added or added and replaced to the intermediate layer to obtain a weave design of 2.5 or 3 layers of wefts. The part is coated with a resin, impregnated, and dried and cured. The resin used may be a polyamide-based resin, a polyurethane-based resin, an acrylic ester-based resin, an epoxy-based resin or the like diluted with a solvent. As a coating method, various methods such as brush, roller and spray can be used. The resin reinforces the degree of bonding due to the intersection of the warp and weft in the joint, so that when the fiber webs are laminated and entangled by needle punching, the entanglement adhesiveness of the joint becomes equal to that of the base fabric body. At the same time, it is effective in preventing loosening of the warp cutting yarn end portion.

[0039]

EXAMPLES Examples 1 and 2 of the present invention will now be described.
2A to 2D will be described. In Tables 1 and 2, TM indicates polyester monofilament, AC indicates acrylic, N indicates nylon such as nylon 6, nylon 66, PS indicates the paper contact side, BS indicates the non-contact paper side, and the web The specification indicates the fineness (unit is dtex, and in the table, a number indicating the fineness is followed by a superscript "T").

(Example 1) As shown in Table 1, the main body of the needle canvas of Example 1 is shown in FIG. 2.5 woven weave, warp 11 (18, 19) 0.40 mm in diameter
φ polyester monofilament yarn (TM in Table 1
0.40 mmφ), the weft yarns 13 and 14 on the paper contact surface side (PS) and the non-contact paper surface side (BS) are 0.40 mm in diameter.
φ polyester monofilament yarn, intermediate weft 1
The base fabric 40 woven with 5 twisted yarns (AC6 ^S / 5 in Table 1) obtained by twisting together 5 acrylic spun yarns of 6 ^S with a fineness of cotton is heat-set, and then the base fabric The weft yarns 13 and 14 at the ends were removed, and the warp yarns 11 were loosened into tufts and set in a joint processing machine.

Further, the joint portion has a diameter dimension of 0.4 on the weft threads 13 and 14 on the paper contact surface side (PS) and the non-contact paper surface (BS) side.
Polyester monofilament yarn 0Mmfai, launch a twisted yarn fineness twisted four acrylic spun yarns of 6 ^S in cotton count as additions and substitutions weft in the weft 15, 21 of the base fabric body of the weft of the intermediate layer of the joint, FIG. As shown in FIG. 2 (E), the weave design 50 of the front 1/3 torn / back 3/1 torn / weft triple weave is used, and further, as in FIG. The extended warp threads 32 from the joint end side of the presser extension warp threads are woven, and the extended warp threads 33 on the base fabric body side facing the respective warp threads 32 are opposed to each other at the dispersed points 31 in the joint portion on the non-contact paper surface side, and face each other. The extended warp 32 on the joint side from the point 31 is moved to the base fabric body side.
The extra warp 33 on the base fabric main body side is designed to be extra for the weft yarn (14) on the joint side, and the respective yarn ends 34, 34 are drawn out to the non-contact paper surface side (BS) and woven. , The joint portion was woven.

Thereafter, the drawn out yarn ends 34, 34 are trimmed at a slightly recessed position on the surface of the base fabric, and a solution prepared by diluting a polyamide resin with an organic solvent is applied to a joint portion of three layers of weft yarns and dried and cured. It was As shown in Table 1, the joint portion is joined to the base fabric including the joint portion, and a nylon 66 fiber staple having a fineness of 6.6 dtex on the paper contact surface side (PS) (N in Table 1).
60% by weight of acrylic fiber staples (represented by 6.6 ^T ) and acrylic fiber staples having a fineness of 11 dtex (represented by AC11 ^T in Table 1): 4
The web 60a mixed with 0% was laminated at a lamination amount of 300 g / m ² , and after being entangled by needle punching, the web 70a having the same composition as that of the paper contact surface side (PS) was formed on the non-contact paper surface side (BS). After laminating at a laminating amount of 100 g / m ² and entangled and integrated with each other by needle punching, heat setting processing is performed, the fibrous web of the joint portion is cut open, and as shown in FIG. A needle canvas 80 including a joint portion having a non-woven fabric layer 60 made of the web 60a on the PS side and a non-woven fabric layer 70 made of the web 70a on the non-contact side (BS) was prepared.

The needle canvas 80 has a warp density of 8
The yarn density was 5.1 yarns / 2.54 cm, the weft yarn density was 15.5 yarns × 2.5 / 2.54 cm in the canvas body, and the joint weft yarn density was 15.5 yarns × 3 / 2.54 cm.

Even when the above-mentioned needle canvas 80 is used, no deformation or extension of the joining loop 20 is observed, the non-woven fabric layers 60 and 70 of the joint portion are not peeled off, and the fibrous web is not peeled off. No looseness of the yarn end 34 of 33 was observed, the knuckle part of the extended warp on the paper contact side did not float, and the joint part was used without waviness. Further, it was possible to use without causing unevenness in drying or marks due to the joint portion.

(Embodiment 2) As shown in Table 1, the main body of the needle canvas of Embodiment 2 has a front 1/3 broken oblique pattern and a back 3/1 broken oblique oblique weft shown in FIG. 2 (A). With a double weave design, the warp 11 is a polyester monofilament yarn having a diameter of 0.40 mmφ, the weft yarn 13 on the PS side of the paper-bonding side is a twisted yarn in which 5 acrylic spun yarns of 6 ^{S in} fineness are twisted, and The weft yarn 14 on the paper-contacting side BS has a diameter of 0.40.
A base fabric 10 is woven using mmφ polyester monofilament yarn. After heat setting, the wefts 13 and 14 at the end of the base fabric 10 are removed, and the warp 11 is loosened to form a tuft, which is then used in a joint processing machine. I set it up.

The weft yarn 13 on the paper contact side PS of the joint is a twisted yarn in which five acrylic spun yarns of 6 ^S having the same fineness as that of the main body base fabric 10 are twisted, and the weft yarn 14 on the non-contact paper side BS. As with the main body fabric, a polyester monofilament yarn with a diameter of 0.40 mmφ, weft yarns 15 and 21 in the middle layer of the joint, and a twisted yarn made by twisting four acrylic spun yarns with a cotton count of 6 ^S into a fineness Table 1/3 shown in 2 (C) Tattered tear and back 3/1 Tattered weft Weft 2.5 Weave design (30) of double weave.

Then, as in FIG. 3 (B), the extended warp threads 32 on the joint end side of the loop forming extended warp threads and the press extension warp threads for the front weft threads are woven in and extended on the base cloth body side facing each warp thread 32. The warp yarns 33 are made to face each other at the points 31 dispersed in the joint portion on the opposite side of the paper surface, and the extended warp yarns 32 from the facing point 31 to the joint end side are transferred to the base cloth body side to the weft yarn (1
4) Extend one warp and extend the warp 33 on the base fabric body side.
Is an extra weft (14) for the joint end side,
The respective thread ends 34, 34 were pulled out to the side opposite to the paper side and woven to form a joint portion.

After this, the drawn-out yarn end is trimmed at a position slightly recessed from the surface of the base fabric, a solution of a polyamide resin diluted with an organic solvent is applied to the joint portion of 2.5 layers of weft yarn, and dried and cured. It was The joint portion is joined to the base cloth 30 including the joint portion, and as shown in Table 1, the fineness is 6. on the paper contact surface side (PS).
A web 61a obtained by mixing 6 dtex of nylon 66 fiber staple and acrylic fiber staple of 11 dtex fineness at a weight ratio of 60%: 40% is laminated at a lamination amount of 200 g / m ² ,
After entanglement and integration by needle punching, heat setting is applied to cut open the fibrous web at the joint,
A needle canvas 9 including a joint portion having a non-woven fabric layer 61 made of a web 61a on the paper contact side as shown in FIG.
0 was created.

The needle canvas 90 has a warp density of 8
5.5 yarns / 2.54cm, weft density is 15.1 × 2 / 2.54cm in the canvas body, 1 in the weft density joint
It was 5.1 × 2.5 / 2.54 cm.

When the needle canvas 90 is used, the joining loop 20 is not deformed or extended, the non-woven fabric layer 61 of the joint portion is not peeled off, and the fibers are not peeled off.
No slack was found in the yarn end portions 34 of the extended warp yarns 32, 33, the knuckle portion of the extended warp yarn on the paper-contacting surface side did not float, and the joint portion was usable without waviness. Further, it was possible to use without causing unevenness in drying or marks due to the joint portion.

[0051]

[Table 1]

(Example 3) As shown in Table 2, the main body of the needle canvas of Example 3 is as shown in FIG. With a double weave design, the warp 11 is a polyester monofilament yarn with a diameter of 0.40 mmφ, and the weft 13 on the PS side of the paper-bonding side is a twisted yarn in which 5 acrylic spun yarns of 6 ^{S in} fineness are twisted together. The weft yarn 14 on the paper-contacting side BS has a diameter of 0.40 mm
Base fabric 10 using φ polyester monofilament yarn
After weaving and heat-setting, the wefts 13 and 14 at the end of the base fabric are removed, and the warp 11 is loosened to form a tuft,
It was set on a joint processing machine.

In the joint portion, the weft yarns 13 and 14 on the paper contact surface side and the non-paper contact surface side are polyester monofilament yarns having a diameter of 0.40 mmφ, and the additional weft yarn 21 of the intermediate layer in the joint portion has a fineness of 6 ^S in cotton count. Twisted yarn in which four acrylic spun yarns are twisted together is set, and Table 1/3 shown in FIG.
Ripple weave / back 3/1 Ripple weft 3 Weave structure of double weave (20)
3B, the extended warp 3 on the joint end side of the loop-forming extended warp and the pressing weft of the leading end weft 3
2 is woven, and the extended warp yarns 33 on the base fabric body side facing the respective warp yarns 32 are made to face each other at the places 31 dispersed at the joint portion on the side opposite to the paper surface, and the extended warp yarns 32 on the joint end side of the opposite place 31 are One extra weft (14) is designed to the base cloth body side, and the extended warp 33 on the base cloth body side is moved to the joint end side.
4) Organize one extra thread, and make each thread end 34, 34
Is woven on the opposite side of the paper and weaves the joint, then trims the drawn yarn end at a position slightly recessed from the surface of the base fabric, and dilutes the polyamide resin with an organic solvent in the joint of three layers of weft. The solution was applied and dried and cured.

As shown in Table 2, the joint portion is joined to the base fabric including the joined portion, and the fineness of 6.6 dtex is applied to the paper-contact surface PS.
Of the nylon 66 fiber staple and the acrylic fiber staple having a fineness of 11 dtex mixed at a weight ratio of 60%: 40% are laminated at a lamination amount of 200 g / m ² and entangled and integrated by needle punching, and then heat set. The joint web was cut open by processing, and a needle canvas 100 including a joint portion having a nonwoven fabric layer 62 made of the web 62a on the paper contact surface side was prepared as shown in FIG. 1 (C).

The needle canvas 100 has a warp density of 84.7 yarns / 2.54 cm, a weft yarn density of 15.7 yarns × 2 / 2.54 cm in the canvas body portion, and 15.7 yarns × 3/2. It was 54 cm.

A weft yarn was added to the joint portion of the needle canvas 100 to ensure rigidity, and no waviness was generated from the joint portion.

(Comparative Example) As shown in Table 2, the base fabric body of the needle canvas of the comparative example is shown in Table 1 shown in FIG.
3 Tattered weft and back 3/1 Tattered weft Weft Weave of double weave, warp 11 is polyester monofilament yarn with diameter of 0.40 mmφ, weft yarn 13 on PS side is 6 ^S with fineness of cotton count. Twisted yarn of 5 acrylic spun yarns,
As the weft yarn 14 on the non-contact paper side BS, the base fabric 10 is woven using a polyester monofilament yarn having a diameter of 0.40 mmφ, and after heat setting treatment, the weft yarn 13 at the end of the base fabric,
14 was removed, the warp was loosened to form a tuft, and the joint processing machine was set.

In the joint portion, the weft yarn 12 is a twisted yarn obtained by twisting five acrylic spun yarns of 6 ^S in cotton count with a weft yarn 13 of PS, which is the same as the base cloth main body, on the side of the joint portion opposite to the paper contact side. A polyester monofilament yarn having a diameter of 0.40 mm is set on the weft yarn 14 of BS, and Table 1 shown in FIG.
／ 3 Tattered Twill / Back 3/1 Tattered Tent Weft 2 Double weave weave (1
3), as in FIG. 3A, the extended warp threads 32 on the joint end side of the loop forming extended warp threads and the press extension warp threads on the front weft threads are woven, and the extended warp threads on the base fabric body side facing the respective warp threads 32 are woven. 33 and the joint portion on the side opposite to the paper surface facing each other at the dispersed points 31, and the respective thread ends 34, 34
After weaving the joint part, weaving the joint part, trimming the drawn thread end at a position slightly recessed from the surface of the base cloth, and applying a solution of polyamide resin diluted with organic solvent to the joint part. , Dried and cured.

A base cloth 1 which is formed by joining the joints and including the joints.
0, as shown in Table 2, the fineness of 6.6 dt on the paper-contact surface PS.
A web in which ex nylon 66 fiber staples and acrylic fiber staples having a fineness of 11 dtex were mixed at a weight ratio of 60%: 40% was laminated at a lamination amount of 200 g / m ² and entangled and integrated by needle punching, and then heat set. Processing was performed, the joint web was cut open, and a needle canvas including a joint portion was created.

The needle canvas has a warp density of 84.
5 threads / 2.54 cm, weft density is 1 in the canvas body
5.5 pieces x 2 / 2.54 cm, 15.5 pieces x 2 / at the joint
It was 2.54 cm.

[0061]

[Table 2]

The displacement amount of the joining loop 20 for each of the joint of Example 3 and the joint of Comparative Example was measured by the following "joining loop pull-out test method".
The displacement amount of the joining loop of the third embodiment is 78% smaller than the displacement amount of the joining loop in the joint of the comparative example for almost the same maximum load, and the joining loop 20 extends during use. There was no deformation.

The amount of pull-out displacement of the joining loop 20 and the peel strength of the nonwoven fabric layer 62 of the canvas body and the joint portion of Example 3 were measured by the following "joining loop pull-out test method" and "nonwoven layer peel strength measuring method", respectively. ", The pull-out displacement amount of the joining loop 20 and the peel strength of the joint portion were the same as those of the canvas body and were equal. During use, the non-woven fabric layer 62 at the joint portion did not peel off, the fibrous web did not peel off, and the joint portion could be used without waviness. Further, it was possible to use without causing unevenness in drying or marks due to the joint portion.

(Joining loop pull-out test method) The nonwoven fabric layer of the joint portion of the example or comparative example was peeled off,
As shown in (A), extend the warp from the joint tip to the wefts 13, 14
At the 22nd knuckle portion 111, 111, hook the hook 113 on the joining loop 112, and hold the base cloth body side by the lower holder 114 to obtain 50 mm /
It was pulled at a speed of a minute, and the displacement amount of the joining loop 112 at the maximum load was measured. In addition, FIG. 5 (A) is a conceptual diagram of a joint portion prepared as a sample, and FIG. 5 (B) is a conceptual diagram of this test method.

(Measurement Method of Peel Strength of Nonwoven Fabric Layer) A rectangular test piece having a length of 150 mm in the warp direction and a width of 30 mm in the weft direction was previously prepared with a length of 1 from the side in the warp direction.
The 00 mm non-woven fabric layer was peeled off, and the non-woven fabric layer piece 123 previously peeled off on the upper holding tool 121 as shown in FIGS.
And the base cloth piece 124 from which the non-woven fabric layer is peeled off is gripped by the lower holder 122, and the tensile peel strength is measured at a speed of 20 mm / min. 6A is a conceptual front view of this measuring method, and FIG. 6B is a side view thereof.

[0066]

According to the joint of the needle canvas of the present invention, the intermediate layer weft of the joint portion is added to the base fabric main body of two layers of weft to form a weave design of 2.5 layers of weft or 3 layers of weft,
Or, the intermediate layer weft of the joint part is added or replaced to the base fabric main body having a weft of 2.5 layers to make a weave of three layers of weft, and the degree of bonding due to the crossing of the warp and the weft of the joint part decreases. Since it is reinforced so that there is no entanglement, the entangled adhesive force between the base fabric and the non-woven fabric layer is made uniform and improved. Also, the joining loop does not extend or deform. In addition, the addition of weft at the joint improves rigidity,
There is no risk of waviness from the joint.

Furthermore, according to the present invention, the weft yarns on the paper-bonding surface and / or the non-paper-bonding surface of the joint portion can be selected so that the surface properties and characteristics of the joint portion are equivalent to those of the canvas body. No mark is produced. in addition,
The extended warp on the joint end side and the extended warp on the base fabric body side
Since more than one weft thread is designed on the opposite side, the warp ends do not become loose during needle punching with the fiber web and during use, and the knuckle part on the side of the paper contact side protrudes excessively. The sheet quality can be maintained at a high level without doing so.

Further, according to the joint of the needle canvas of the present invention, the weft of 2.5 layers or 3 layers of the base cloth joint is coated and impregnated with resin, and the resin is hardened. The degree of coupling by is further strengthened,
The effect of using 2.5 or 3 layers of weft yarns for the joint portion woven structure becomes more remarkable.

[Brief description of drawings]

FIG. 1 (A) is a cross-sectional conceptual view of a joint portion of a papermaking needle canvas in the first embodiment of the present invention, and (B) is a cross-sectional conceptual view of a joint portion of a papermaking needle canvas in a second embodiment of the present invention. FIG. 6C is a conceptual sectional view of the joint portion of the needle canvas for papermaking in the third embodiment of the present invention.

FIG. 2 shows various woven structures of a joint portion and a base fabric body of the needle canvas for papermaking according to the present invention.
3 Twill Twill / Back 3/1 Tatter Tent Weft 2 Double weave organization chart,
(B) is a front 1/3 torn / back 3/1 torn oblique weft 3-fold weave organization chart, (C) is a table 1/3 torn oblique / back 3/1 torn oblique weft 2. 5 double woven weave organization chart, (D) is the front 1/3 torn and back 3/1 torn weft 2.5 Weave organization chart of the double weave, (E)
Is a weaving organization chart of a front 1/3 torn oblique pattern and a back 3/1 torn oblique oblique weft triple weave.

FIG. 3 is a conceptual diagram showing various processing methods of the extended warp on the loop end and the weft on the leading end weft, the extended warp on the joint end side of the extended warp, and the extended warp on the base fabric body side on the side opposite to the paper surface.
(A) is a conceptual diagram in which the extended warp on the joint end side and the extended warp on the base fabric body side are cut at intersections on the opposite contact surface side,
(B) is a conceptual diagram in which the extended warp on the joint end side and the extended warp on the base fabric body side are woven and cut from the intersection point on the opposite contact surface side to the base fabric body side and the joint end side, respectively, by one weft, (C) The extended warp on the joint end side and the extended warp on the base fabric body side are woven from the intersection point on the opposite side of the paper surface and the extended warp on the joint end side is further woven and cut into the base fabric body side by one weft. (D) is a conceptual diagram in which the extended warp on the joint end side and the extended warp on the base fabric main body side are woven into the base fabric main body side and the joint end side by two weft yarns from the crossing point on the opposite contact surface side. It is a conceptual diagram of cutting.

FIG. 4 is a conceptual diagram of a joint of a conventional needle canvas for papermaking.

5A is a conceptual diagram of a test piece used for a joining loop pull-out test, and FIG. 5B is an explanatory diagram of a joining loop pull-out test method.

FIG. 6A is a conceptual front view illustrating a method for measuring the peel strength of a nonwoven fabric layer, and FIG. 6B is a conceptual side view thereof.

[Explanation of symbols]

10, 20, 30, 40, 50 Base cloth (or joint) 11 warp 12 weft 13 Weft on the side of the paper 14 Weft on the opposite side 15 Weft in the middle layer 18,19 warp 20 joining loop 21 Additional intermediate layer weft 31 Opposite points of extended warp 32 Extended warp on the joint end side 33 Extended warp on the base fabric body side 34 End of extended warp 60a, 61a, 62a Web on the paper contact side 60, 61, 62 Non-woven fabric layer on the paper contact side 70a Web on the opposite side 70 Non-woven fabric layer on the opposite side 80, 90, 100 Needle canvas joints for papermaking

Claims (4)

[Claims] 1. A base fabric having a weave of 2 or 2.5 layers of weft using synthetic monofilament yarns as warp and at least one weft located on the paper contact side or the non-paper contact side, and staple fibers. In a needle canvas for papermaking, which is composed of a non-woven fabric layer in which the synthetic fiber web is entangled by needle punching, the extended warp obtained by removing the weft yarn at the end of the base fabric is used as a loop forming extended warp yarn and a leading weft pressing extended warp yarn. , Forming loops for joining with loop forming extended warp,
The weft having an intermediate weft layer formed by folding back the extended warp and weaving it with the wefts arranged at the ends of the base fabric and forming a weave structure of the base fabric joint portion using a spun twisted yarn of synthetic fiber. A needle canvas joint for papermaking, which has a woven structure of 2.5 layers or 3 layers. 2. In the base cloth joint portion, a weft yarn in a layer on the paper contact surface side and / or the non-contact paper surface side, which is woven with the joint side extended warp and the base cloth side extended warp, is formed with a base cloth main body. And / or yarns having different materials and / or fineness are used, and the joint of the needle canvas for papermaking according to claim 1. 3. A weft yarn extending from the joint side extended warp folded back at the base fabric joint portion and a base fabric side extended warp facing the warp yarn to each other, and each extended warp yarn further on the opposite side of the paper surface. The needle canvas joint for papermaking according to claim 1 or 2, characterized in that the weft yarn is designed to have an excess of more than a minute. 4. 2.5 layers or 3 layers of weft yarns in the base cloth joint portion
The joint of the needle canvas for papermaking according to any one of claims 1 to 3, wherein a portion of the woven structure of the layer is coated and impregnated with a resin and cured.