JP3505288B2 - Warp single weft triple structure papermaking fabric - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking fabric, and more particularly to a multi-layered papermaking fabric having triple weft yarns and single warp yarns.

[0002]

2. Description of the Related Art Woven fabrics having a multi-layered structure for papermaking include warp single weft double woven fabrics, warp double weft double woven fabrics in which two upper and lower woven fabrics are joined by binding yarns, and the like. Are known. With increasing papermaking speed, triple woven fabrics have come to be used. When the papermaking speed was increased, wavy wrinkles were found in the papermaking fabric, and it was difficult to completely prevent wrinkles from occurring without making the papermaking fabric triple. The occurrence of wrinkles causes a serious problem that the paper becomes thin and thin. A triple woven fabric is, for example, Japanese Patent Publication 6-495.
No. 3 discloses a single weft consisting of three layers of upper weft, middle weft, and lower weft having a large diameter and a high density.
Cross pitch P ₁ with lower weft and cross pitch P ₂ with upper weft
Is set to P ₁ = 2P _{2 to} 4P ₂ , and a papermaking fabric in which a long crimp is formed on the running surface is shown. This woven fabric has excellent abrasion resistance. However, the looseness of the lower weft has become a problem. Since the running surface is formed by the long crimp of the lower weft, it has a large wear volume and exhibits excellent wear resistance against wear caused by contact. However, since the lower weft is woven only with one warp and the weaving force is weak, the lower weft is loose. Since the lower weft has rattling and is formed by a long crimp, when it is dehydrated by a foil or the like at a high speed, it is subjected to shocking abrasion such that it is vibrated violently. When the lower weft is violently vibrated, it becomes fibrillated and cracked or cut. There is also a problem that turbulent flow is generated due to the vibration, and this turbulent flow affects the wet paper web formation to generate marks on the paper.

[0003]

Even when used under severe conditions in a high-speed machine, no wavy wrinkles are generated, no bad BD profile is produced, paper thickness is not generated, and the lower weft thread is loose. Provide a papermaking fabric that does not.

[0004]

The present invention provides a "1. warp single weft triple structure including upper weft, middle weft, lower weft arranged in upper and lower three layers and a single warp woven with the three layers of weft. In the papermaking fabric of No. 2, each warp has a complete design, and two upper wefts adjacent to each other are set as a set at equal intervals from the papermaking surface, and the weaving position of the adjacent warp is offset by one or more wefts and woven twice. Two knuckles are formed at equal intervals, and each warp is a complete design and forms a pair with another warp that sandwiches two adjacent warps, and the same lower weft is woven at least once from the running surface. A warp single weft triple structure triple structure papermaking fabric characterized by forming a long crimp of a lower weft on the side of the surface 2. An auxiliary upper weft having a smaller diameter than the upper weft is arranged between each upper weft. Woven fabric with a triple weft structure described in 3. A papermaking fabric having a warp single-weft triple-layer structure as described in item 2, in which the auxiliary middle weft is arranged between the middle wefts located below the auxiliary upper weft. The knuckle referred to in the present invention is an intersecting portion in which a warp yarn crosses a weft yarn and weaves it into a texture, and a crimp means a yarn between knuckles.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, three kinds of upper, middle and lower layers are used, namely, an upper weft forming a papermaking surface as a weft, a lower weft forming a running surface, and a middle weft forming an intermediate layer between the two. They are arranged and woven with a single warp to form a paper fabric having a structure of a warp, a single weft and a triple layer.

[0006] The structure of the woven fabric is a complete design, and each warp is woven twice from the papermaking surface at equal intervals, with two adjacent wefts as one set. Therefore, a knuckle in which two adjacent upper wefts are woven together is formed at two equal intervals on each paper-making surface of the warp with the complete design of the warp. Since the position at which two adjacent sets of wefts are woven is shifted by one or more wefts from the position at which the adjacent warp yarns are woven, the knuckles are not continuously arranged in the weft direction. Each warp has a complete design and weaves two lower wefts from the running surface. The weaving position is the same lower weft as the other warp paired with the two adjacent warp threads from the running surface. Weave. After all, the lower weft has a complete design with a pair of warps that sandwich two warps.
Since it is woven twice, a long crimp of the lower weft is formed on the running surface. The middle weft passes above and below the middle weft when the warp weaves the upper weft and the lower weft, and is woven by this.
Further, since the lower weft is woven with two warps forming a pair, weaving is strong and the knuckle is stable, and even if a long crimp is formed, rattling does not occur.

In this way, the rigidity of the woven fabric in the weft direction, especially the bending rigidity is increased, and wavy wrinkles do not occur even when used in harsh conditions on a high-speed machine. A defective BD profile, which is the distribution of the amount, and thick or thin paper do not occur. When wavy wrinkles occur, more paper material collects in the concave portions of the wrinkles than in the convex portions of the wrinkles, so the paper of the concave portions naturally becomes thick and heavy, and the paper of the convex portions becomes thin and light. And BD according to wrinkles
A defect will occur.

The middle weft yarn has the function of increasing the rigidity of the woven fabric in the weft direction, and further has the action of controlling the water flow of the woven fabric. Since the lower weft is strongly woven with a pair of warps, the lower weft has a good crimping property and can be bent strongly, so that a lower weft with a large wire diameter can be used and wear resistance, Both bending rigidity can be improved.
Moreover, since the lower weft is strongly woven in the fabric structure,
There is no movement of the lower weft and the holding property is good. Therefore, even when worn by a suction box, foil, etc. when running on a high-speed machine, the lower weft does not move and is not offset, and the lower weft becomes fibrillated due to repeated bending and impact. There is nothing to do.

In the present invention, an auxiliary weft may be arranged between the upper wefts in order to make the paper-making surface smooth. When the upper weft is woven with the warp, the yarn bends downward and a dent is formed between adjacent wefts, but when an auxiliary weft is placed here, the dent is compensated to smooth the papermaking surface and improve the smoothness of the paper. . Since the auxiliary weft has a smaller wire diameter than the weft, it does not substantially change the water quality or the fabric structure. It is also possible to arrange the auxiliary middle weft under the auxiliary upper weft, and if the rigidity in the weft direction is more important than the water resistance, increase the rigidity of the middle weft and use a structure that sacrifices the water resistance. Sometimes auxiliary middle wefts are very effective.

As the lower weft, a yarn having a larger wire diameter than the upper and middle wefts can be used, and the rigidity can be further increased. The warp yarn used in the present invention is preferably a polyester monofilament yarn because of its high rigidity and low elongation. As the weft, nylon monofilament or polyester monofilament is preferably used, but these monofilaments may be used in combination. As an auxiliary weft,
Nylon monofilament and polyester monofilament are used. If heat resistance is required, polyphenylene sulfide monofilament is also suitable.

[0011]

EXAMPLES The present invention will be specifically described with reference to examples.
1, 2 and 3 are design diagrams showing the complete design of the present invention. In the design diagram, a cross indicates a portion where the warp threads intersect with each other on the upper side of the upper weft, and indicates a position where the upper weft is woven from the paper-making side. A circle mark indicates a portion where the warp crosses under the lower weft, and the position where the lower weft is woven from the running surface side. The unmarked portion indicates a portion where the warp is arranged between the upper weft and the middle weft or between the middle weft and the lower weft. In the present invention, it is not particularly limited as to which one of them is arranged, and therefore it may be arranged in any one. A specific example will be shown later with a cross-sectional view taken along the warp. The warp is a number without a dash, the weft is a number with a dash, the wefts arranged in the upper, middle, and lower layers are the same number, and the auxiliary weft is a number with a double dash.

In the embodiment shown in FIG. 1, 16 warps, upper and
Auxiliary weft 1 arranged between 16 middle and lower wefts and upper weft
A complete tissue is formed with 6 pieces. The warp 1 passes under the two lower wefts 1'and 19 ', and is woven from the running surface side to obtain an upper weft 9', an upper weft 11 'and an upper weft 25',
It passes over the upper weft yarn 27 'and is woven from the paper making side. In the present embodiment, the auxiliary weft 1 arranged between two continuous upper wefts woven from the paper making surface side.
0 ″ and auxiliary weft 26 ″ are simultaneously woven from the side of the paper making surface. Further, the warp 1 is paired with two adjacent warp 2 and warp 3 sandwiching the warp 4 and the lower weft 19 'is woven from the running surface side to the long crimp of the lower weft 19' on the running surface side. Is formed. Furthermore, the warp 1 is
Two adjacent warp yarns 15 and 16 in the design drawing continuing to the left
It is understood that the lower weft 1'is woven from the running surface side in a pair with the warp yarn 14 in which the lower weft 1'is sandwiched to form a long crimp of the lower weft 1'on the running surface side. The other warp yarns 2 to 16 are sequentially arranged by shifting the warp yarn 1 by three weft yarns (six weft yarns when the auxiliary weft yarn is included). Weft is woven from the running surface side.

As described above, the lower weft 1'is composed of the warp 1 and the warp 14, the lower weft 3'is composed of the warps 9 and 12, the lower weft 5'is composed of the warps 4 and 7, and the lower weft 7'is composed of the warp 2, 2.
15 and the lower weft 9'by the warps 10 and 13,
The lower weft 11 'is formed by the warps 5, 8, the lower weft 13' is formed by the warps 3, 16, the lower weft 15 'is formed by the warps 11, 14 and the lower weft 17' is formed by the warps 6, 9.
9'is warp yarns 1 and 4, lower weft yarn 21 'is warp yarn 12,
15, the lower weft 23 'is
The lower weft 25 'is woven with the warp yarns 2 and 5, the lower weft yarn 27' with the warp yarns 13 and 16, the lower weft yarn 29 'with the warp yarns 8 and 11, and the lower weft yarn 31' with the warp yarns 3 and 6 from the running surface side. A long crimp for 12 warps is formed on the running surface side.

It is also understood that the warp yarn is obtained by weaving two continuous upper weft yarns twice at equal intervals from the paper-making surface side.
That is, two repeating units of the weft portion of the upper weft are formed in the warp direction in the complete design. For example, warp 1 includes upper wefts 9'and 11 'and upper wefts 25' and 2 '.
7'is woven from the side of the paper making side, and in between, upper wefts 13 ', 15', 17 ', 19', 21 ', 23'
The upper wefts 29 ', 31' and the upper wefts 1 ', 3', 5 ', 7'following the complete design are arranged, and the intervals between them are the same for the six upper wefts.

The arrangement of the warps other than the portion in which the upper weft is woven from the paper making surface side and the portion in which the lower weft is woven from the running surface side is not particularly limited.
It may be arranged between the upper weft and the middle weft and between the middle weft and the lower weft. The arrangement of the warp threads is shown in a cross section along the warp thread 1. FIG. 4 is a sectional view taken along the warp 1 of FIG. There are other variations. After weaving under the lower weft 1 ',
It passes between the continuous middle wefts 3 ', 5'and the lower wefts 3', 5 ', then between the upper wefts 7'and the middle wefts 7', and then of the continuous upper wefts 9 ', 11'. Weave through the top, then pass between the upper weft 13 'and the middle weft 13',
Then, the continuous middle wefts 15 ', 17' and the lower wefts 15 ',
17 ', then weaving under the lower weft 19', then passing between the middle weft 21 'and the lower weft 21', then passing between the upper weft 23 'and the middle weft 23'. And then weave over the continuous upper wefts 25 ', 27', then pass between the upper weft 29 'and the middle weft 29', then pass between the middle weft 31 'and the lower weft 31'. ing. The auxiliary wefts are simultaneously woven with auxiliary wefts 10 ″ and 26 ″ arranged between two continuous upper wefts 9 ′ and 11 ′ and 25 ′ and 27 ′ which are woven from the paper-making surface side.

FIG. 2 is a design diagram showing the complete design of another embodiment. Similar to the embodiment of FIG. 1, 16 warps, 16 upper / middle / lower wefts, and 16 auxiliary wefts form a complete design. The warp 1 is woven from the running surface side under the two lower wefts, that is, the lower weft 1'and the lower weft 3 ', and the upper wefts 9', 1
1'and the upper wefts 25 ', 27' are passed over and woven from the paper-making side. Regarding the auxiliary wefts, also in this embodiment, the auxiliary wefts 10 ″ and 26 ″, which are arranged between the upper wefts woven from the paper making surface side, are simultaneously woven from the paper making surface side. Further, the warp 1 is paired with a warp 4 which sandwiches two adjacent warps 2 and 3 and weaves a lower weft 3'from the running surface side, and a long crimp of the lower weft 3'is laid on the running surface side. Is being formed. Further, the warp 1 is paired with the warp 14 which is obtained by sandwiching two adjacent warp yarns 15 and 16 in the design drawing continuing to the left side, and the lower weft 1'is woven from the running face side to the lower weft 1 on the running face side. It forms a'long crimp. As for the other warp yarns, 11 warp yarns are displaced by 11 and are sequentially arranged as warp yarns 2 to 16. In the same manner as the warp yarn 1, two adjacent warp yarns are paired and the lower weft yarns are woven from the running surface side. 5 is a cross-sectional view taken along the warp 1 in order to explain the arrangement of the warp and the weft, which is not limited to this, but where the weft on the paper making side and the weft on the running side of the warp are not woven in FIG. And Fig. 6
Indicates. Comparing the cross-sectional view of FIG. 5 with the cross-sectional view of FIG. 6, FIG. 5 shows that the warp passes more often between the middle wefts and the warp is bent more. There is an advantage that the tensile strength of the woven joint is strong when the woven joints are made to be endless. On the other hand, FIG. 6 has the advantage that the bending rigidity in the weft direction is strong because the warp passes less frequently between the middle wefts and the middle wefts bend less.
There are other variations.

FIG. 3 is a design diagram showing the complete design of another embodiment. It is the same as the embodiment shown in FIG. 1 except that the method of weaving the auxiliary weft is different. In the embodiment of FIG. 1, the auxiliary weft disposed between two continuous upper wefts woven from the paper-making surface side is woven from the paper-making surface side, whereas in the present embodiment, the auxiliary weft is interwoven. Instead, the auxiliary wefts located on the opposite side of the auxiliary wefts, that is, the auxiliary wefts arranged between the woven upper wefts and the non-woven upper wefts are woven from the paper-making side. For example, in the portion where the upper wefts 9 ′ and 11 ′ are woven, the auxiliary wefts 10 ″ are not woven in but the auxiliary wefts 8 ″ and 12 ″ are woven. FIG. 7 shows the woven fabric of FIG. Fig. 8 is a sectional view of the warp yarn 1 cut by cutting the auxiliary weft yarns 10 "and 26" from Fig. 7.
You can see the arrangement.

As described above, according to the present invention, in a papermaking woven fabric having a warp single weft triple structure, a lower weft is woven from a running surface side by a pair of adjacent warp threads, and a lower weft is laid down to the running surface side. It forms a long crimp of weft. Since the wefts are arranged in three layers, the bending rigidity in the weft direction is large, and since the lower weft is formed with a long crimp, wear resistance is good. In addition, 1 which sandwiched two adjacent warp yarns
Since the lower weft is strongly woven with a pair of warps, the lower weft has a good crimping property and can be bent strongly, so it is possible to use a lower weft with a large wire diameter, and further improve both wear resistance and bending rigidity. In addition, the lower weft does not rattle or move, the holding property is effective, and fibrillation or turbulence does not occur.
Incidentally, it is possible to dispose the auxiliary middle weft under the auxiliary upper weft, which is effective for a paper machine or the like in which the rigidity in the weft direction is more important than the water-based property.

COMPARATIVE TEST An example shown in FIG. 1 was used as a comparative example 1 which is a 7-shaft warp single-weft double woven fabric, which has been used well in the past, and which has a complete design with 7 upper and 7 lower wefts. Table 1 shows the results of a comparative test conducted with No. 1 as a representative example of the present invention. The composition of the fabric is also shown in Table 1.

[0020]

[Table 1]

* 1 Stiffness: A coefficient representing the rigidity of a woven fabric. The stiffness in the weft direction was measured by "Taber Stiffness Tester" of Kumagai Riki Kogyo Co., Ltd. * 2 Life cycle ratio: The life cycle ratio was defined as the time until the wire diameter of the warp was worn by 50% using a wear tester manufactured by Nippon Filcon Co., Ltd. (utility model registration No. 1350124). This comparative test shows that the papermaking fabric of the present invention has a stiffness of 6.8 times and a life expectancy of 2.7 times that of the comparative example.

[0022]

According to the present invention, the rigidity in the weft direction is large, wavy wrinkles are not generated, the BD profile is not defective, the thickness of paper is not thin, the abrasion resistance is large, and the lower weft is not rattled or moved. The retention property is effective and an excellent effect that fibrillation and turbulence do not occur is exhibited.

[Brief description of drawings]

FIG. 1 is a design diagram showing a complete design of a papermaking fabric of the present invention.

FIG. 2 is a design diagram showing a complete design of another embodiment of the present invention.

FIG. 3 is a design diagram showing a complete design of another embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along the warp 1 of FIG.

FIG. 5 is a sectional view taken along the warp 1 of FIG.

FIG. 6 is a cross-sectional view taken along the warp 1 in the case where the weave of the fabric of FIG. 2 in which the warp and the intermediate weft are different from that of FIG.

FIG. 7 is a sectional view taken along the warp 1 of FIG.

[Explanation of symbols]

1 warp 2 warp 3 warp 4 warp 5 warp 6 warp 7 warp 8 warp 9 warp 10 warp 11 warp 12 warp 13 warp 14 warp 15 warp 16 warp 1'upper / middle / lower weft 3'upper / middle / lower weft 5'upper / middle / lower weft 7'upper / middle / lower weft 9'upper / middle / lower weft 11 'upper / middle / lower weft 13 'upper / middle / lower weft 15 'upper / middle / lower weft 17 'upper / middle / lower weft 19 'upper / middle / lower weft 21 'upper / middle / lower weft 23 'upper / middle / lower weft 25 'upper / middle / lower weft 27 'upper / middle / lower weft 29 'upper / middle / lower weft 31 'upper / middle / lower weft 2 ″ auxiliary weft 4 ″ auxiliary weft 6 ″ auxiliary weft 8 ″ auxiliary weft 10 ″ auxiliary weft 12 ″ auxiliary weft 14 ″ auxiliary weft 16 ″ auxiliary weft 18 ″ auxiliary weft 20 ″ auxiliary weft 22 ″ auxiliary weft 24 ″ auxiliary weft 26 ″ auxiliary weft 28 ″ auxiliary weft 30 ″ auxiliary weft 32 ″ auxiliary weft

Claims (3)

(57) [Claims] 1. An upper weft, a middle weft, which are arranged in upper and lower three layers,
In a papermaking woven fabric having a lower weft and a three-layer weft and a single warp weaving, a single weft triple structure, each warp is a complete design and two upper wefts adjacent to each other form a set and are equally spaced from the papermaking surface. Moreover, the weaving position of the adjacent warp is shifted by one or more wefts and weaved twice to form two knuckles on the papermaking surface at equal intervals, and each warp is a complete design and sandwiches two adjacent warps. A papermaking fabric having a triple structure of warp single weft, wherein a long crimp of the lower weft is formed on the running surface side by weaving the same lower weft yarn in pairs with other warp yarns at least once from the running surface. 2. The papermaking fabric having a triple structure of warp single weft according to claim 1, wherein an auxiliary upper weft having a smaller diameter than the upper weft is arranged between each upper weft. 3. The papermaking fabric according to claim 2, wherein the auxiliary middle wefts are arranged between the middle wefts located below the auxiliary upper wefts.