JP2019019434A - Shoe press belt base fabric and shoe press belt - Google Patents

Abstract

To provide: a shoe press belt base cloth capable of improving adhesiveness between a multifilament twist yarn used as a predetermined warp and an elastic material while maintaining elongation and strength in a shoe press belt base fabric having a multiple weave structure; and a shoe press belt.SOLUTION: A base fabric 2 is a shoe press belt base cloth 2 woven through three or four quarters using a warp yarn 21 extending in a running direction Dand a weft yarn 22 extending in a width direction D, and twisted yarns X (X) are included in the outermost warp yarns 21 of a felt side 2a, and the twisted yarns X are made of multifilament yarns subjected to twisting of S times/25.4 mm. It is a twisted yarn twisted 3 or 4 bundles and Z times/25.4 mm and satisfies S≥15, Z≥10 and S/Z≥1.5. This belt comprises an elastic layer and a base fabric embedded in the elastic layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shoe press belt base fabric and a shoe press belt. More specifically, the present invention relates to a shoe press belt base fabric and a shoe press belt used for squeezing a paper machine.

  The papermaking process includes a wire part, a press part, and a dry part. Among these, a press part is a part which obtains a paper sheet by squeezing moisture from wet paper using a press felt. For example, a shoe press device 8 (see FIG. 10) is used. The shoe press device 8 includes a press roll 81, a pressure shoe 82 having a curved surface corresponding to the circumferential shape of the press roll, and a shoe press belt 1 fixed in a cylindrical shape. The shoe press belt 1 used here is composed of an elastic layer and a shoe press belt base fabric embedded as a support thereof. The shoe press belt 1 is overlapped with the press felt 85, the wet paper 84, and the felt 83, travels while being pressed between the press roll 81 and the pressure shoe 82, and squeezes the wet paper 84. The following Patent Document 1 is known as a shoe press belt base fabric.

JP 2007-239132 A

  As described in Patent Document 1, a shoe press belt usually travels in the width direction (a direction perpendicular to the traveling direction) while a central portion thereof is in contact with the shoe, and both ends thereof are not in contact with the shoe. Run. For this reason, both end portions tend to be delayed with respect to the central portion, and cracks and the like are likely to occur in the elastic layer near the boundary between the portion that is in contact with the shoe and the portion that is not in contact with the shoe press belt. There are challenges. In particular, it has been pointed out that the elastic layer on the felt side surface of the shoe press belt tends to be hardened in recent years from the viewpoint of improving drainage efficiency, and is more likely to crack compared to a flexible elastic layer. Although the occurrence of cracks does not immediately become a problem, in order to maintain the functions such as preventing the seepage of lubricating oil for reducing sliding friction, the period until the occurrence of cracks is longer, and the rate of crack propagation that has occurred Is required to be slow. Regarding the above-described improvement in crack resistance, Patent Document 1 attempts to cope with a shoe press belt base fabric, which is a shoe press belt support.

  That is, Patent Document 1 proposes to use a multifilament twisted yarn as the outermost layer warp on the felt side. It has been disclosed that the use of multifilament twisted yarns can eliminate the possibility of fibrillation of monofilaments used as felt side warps of conventional shoe press belt base fabrics and can suppress the occurrence of cracks in the shoe press belt. However, there is a demand for further improvement of the base fabric performance and further improvement of the durability of the shoe press belt.

  The present invention has been made in view of the above circumstances, and in a multi-woven shoe press belt base fabric, while maintaining elongation and strength, a multifilament twisted yarn and an elastic material used as predetermined warps An object of the present invention is to provide a shoe press belt base fabric and a shoe press belt capable of improving the adhesion of the shoe.

  The present inventor has studied the durability improvement of the base fabric using the multifilament twisted yarn as the outermost layer warp, which is the shoe press belt base fabric disclosed in the above-mentioned Patent Document 1, and the multifilament We focused on the adhesiveness between the twisted yarn and the elastic material constituting the elastic layer. That is, the inventors considered to improve crack resistance by improving the adhesion between the multifilament twisted yarn and the elastic material. In order to improve the adhesion, it was considered effective to suppress the inclusion of bubbles between the multifilament twisted yarn and the elastic material and to increase the anchoring action between the multifilament twisted yarn and the elastic material. And in order to express these effects, we focused on strengthening the twist of the multifilament twisted yarn. That is, the inventors conceived that the surface unevenness of the twisted yarn can be increased by strengthening the twist, and the amount of air contained in the yarn can be reduced by strengthening the lower twist.

For this reason, this inventor examined utilization of the multifilament twist yarn whose twist is stronger than what was conventionally employ | adopted. However, the multifilament twisted yarn has a problem that the strength of the base fabric using the constituent yarn having inferior properties is also lowered because the strength is greatly reduced as the twist is increased. Furthermore, while the thickness of the base fabric needs to be precisely controlled, if the twist is increased, the apparent thickness of the multifilament twisted yarn becomes larger, which causes a problem that it becomes difficult to fit the desired thickness of the base fabric. .
On the other hand, the present inventor, while studying a number of multifilament twisted yarns combined with various twists, in a multifilament twisted yarn having a predetermined twist characteristic, reduction of internal voids, increase of surface irregularities, The inventors have found that the strength of the base fabric in the shoe press belt base fabric is not lowered while realizing the increase in the surface area associated therewith, and have completed the present invention.

That is, the present invention is as follows.
The shoe press belt base fabric according to claim 1 is a shoe press belt base fabric woven in a warp triple or warp quadruple using a warp extending in the running direction and a weft extending in the width direction. There,
The warp yarns constituting the outermost layer on the felt side include various twisted yarns X,
The twisted yarns X are twisted yarns in which three or four multifilament yarns having a S twist / 25.4 mm twist are bundled and Z twists / 25.4 mm are twisted,
The gist of the S and the Z is to satisfy the following (1) to (3).
(1) S ≧ 15
(2) Z ≧ 10
(3) S / Z ≧ 1.5
The gist of the shoe press belt base fabric according to claim 2 is the shoe press belt base fabric according to claim 1, wherein the multifilament yarn has a fineness of 220 dtex or more and 3300 dtex or less.
The shoe press belt base fabric according to claim 3 is the shoe press belt base fabric according to claim 1 or 2, wherein the number of warps constituting the outermost layer on the felt side is 8 or more per 25.4 mm. The main point is to include the following warps.
The shoe press belt base fabric according to claim 4 is the shoe press belt base fabric according to any one of claims 1 to 3, wherein the warp yarn constituting the outermost layer on the shoe side is a twisted yarn X. The gist.
The shoe press belt base fabric according to claim 5 is the shoe press belt base fabric according to claim 4, wherein the number of warps constituting the outermost layer on the shoe side is 8 or more and 18 or less per 25.4 mm. The main point is to include the warp.
The gist of the shoe press belt according to claim 6 is provided with an elastic layer and the shoe press belt base fabric according to any one of claims 1 to 5 embedded in the elastic layer. .

In the shoe press belt base fabric of the present invention, a multifilament raw yarn in which a warp constituting an outermost layer on the felt side includes a twisted yarn X, and the twisted yarn X is subjected to a S twist / 25.4 mm twist. 3 or 4 bundles and twisted Z times / 25.4 mm, and S and Z are (1) S ≧ 15, (2) Z ≧ 10 and (3) S / Z ≧ Satisfies 1.5. According to this configuration, the surface unevenness is greatly increased while the apparent thickness is reduced while the amount of voids contained in the plied yarns X is reduced as compared to the multifilament twisted yarn used for the conventional base fabric. it can. For this reason, while the adhesiveness between the plied yarns X and the elastic material can be improved, even if the plied yarns X are used, the elongation and strength of the shoe press belt base fabric can be maintained.
In addition, when the fineness of the multifilament raw yarn is 220 dtex or more and 3300 dtex or less, the present shoe press belt base fabric is particularly well-suited while realizing a form (base fabric thickness, etc.) that can be directly replaced with a conventional product. The adhesiveness between the plied yarns X and the elastic material can be improved while maintaining the elongation and strength.
The shoe press belt includes an elastic layer formed of an elastic material and the shoe press belt base fabric of the present invention, and the shoe press belt base fabric is embedded in the elastic layer. With this configuration, the present shoe press belt can achieve improved crack resistance due to improved adhesion between the shoe press belt base fabric and the elastic material.

It is explanatory drawing explaining the cross section of an example (warply four-fold) of this shoe press belt base fabric. It is explanatory drawing explaining the cross section of the other example (warp quadruple weave) of this shoe press belt base fabric. It is explanatory drawing explaining the cross section of the other example (warp quadruple weave) of this shoe press belt base fabric. It is explanatory drawing explaining the cross section of the other example (warp triple weave) of this shoe press belt base fabric. It is explanatory drawing explaining the cross section of an example of this shoe press belt. It is explanatory drawing of the various twisted yarn X used for this shoe press belt base fabric. It is explanatory drawing of the conventional multifilament twisted yarn. It is an explanatory view illustrating a concave portion depth D _R. It is an explanatory view illustrating a concave area S _R. It is explanatory drawing which shows an example of a shoe press apparatus typically.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, these embodiments are examples embodying the present invention and do not limit the technical scope of the present invention. Moreover, the description, illustration, and code | symbol in the following description are an illustration. Furthermore, the size of each part in the drawing may be emphasized as appropriate for the sake of explanation, and the actual ratio and size of each part are not reflected.

[1] A shoe press belt base fabric present shoe press belt base fabric 2 with the traveling direction D weft 22 extending in the warp 21 and the width direction D ₂ which extends to _1, after triple or through quadruple It is a shoe press belt base fabric woven in.
Further, in the shoe press belt base fabric 2, the twisted yarns X are included in the warp yarn (outermost layer warp yarn) constituting the outermost layer on the felt side 2a.
The plied yarns X are twisted yarns obtained by bundling three or four multifilament yarns with S twists / 25.4 mm of lower twist and Z twists / 25.4 mm of upper twist. And Z satisfies (1) S ≧ 15, (2) Z ≧ 10, and (3) S / Z ≧ 1.5 (see FIGS. 1 to 4).
Hereinafter, the plied yarns X included as the outermost layer warp 211 on the felt side 2a are also simply referred to as “various plied yarns X ₂₁₁ ”. The twisted yarns X included as the outermost layer warp 214 on the shoe side 2b are also simply referred to as “twisted yarns _X214 ”. And the matter common to these is demonstrated as the various twisted yarn X. FIG.

The shoe press belt base fabric 2 (hereinafter also simply referred to as “base fabric”) has a running direction as D ₁ (see FIG. 10) and a component yarn extending in this direction as a warp 21. On the other hand, the width direction is D ₂ (see FIGS. 1 to 4), and the constituent yarn extending in this direction is the weft yarn 22. And these running direction D ₁ and the width direction D _2, usually orthogonal.
Further, the base fabric 2 is a warp triple woven fabric having three warp layers or a warp four woven fabric having four warp layers.
Although it is rare to use a woven fabric woven in multiple layers of 5 or more warp yarns as the shoe press belt base fabric, the adhesiveness between the warp and the elastic material is maintained while maintaining the elongation and strength of the base fabric. In order to improve the above, it is naturally effective to apply the present invention to these woven fabrics.

The base fabric 2 has various twisted yarns X as the outermost layer warp 211 on the felt side 2 a among the warps 21. The plied yarns X are twisted yarns obtained by bundling three or four multifilament yarns that have been subjected to a lower twist of S times / 25.4 mm and then giving an upper twist of Z times / 25.4 mm. (1) S ≧ 15, (2) Z ≧ 10, and (3) S / Z ≧ 1.5.
That is, the plied yarn X is a bundle of three or four multifilament yarns that have been twisted at least 15 times per 25.4 mm (1 inch), and further the upper twist per 25.4 mm (1 inch). It is a multifilament twisted yarn that has been applied 10 times or more and the number of lower twists is maintained at 1.5 times or more of the number of upper twists.

  In the shoe press belt base fabric, the use of multifilament twisted yarn has an advantage of increasing the adhesion area with the elastic layer compared to monofilament single yarn or monofilament twisted yarn. That is, as the surface area of the yarn is increased, the area in contact with the elastic layer is increased, so that the adhesion area is increased. On the other hand, the yarn surface and the elastic layer are not always in the most preferable adhesion state, and problems such as insufficient adhesion and mixing of bubbles can be latent. These are defects occurring at the interface between the yarn and the elastic layer, and are considered to be one cause of the initial crack since it becomes a crack starting point. Therefore, the use of multifilament twisted yarn is advantageous from the viewpoint of increasing the bonding area, but not only normal bonding is obtained, so it is disadvantageous from the viewpoint of increasing the potential risk of crack initiation due to the increase in interface. obtain. Therefore, not only by increasing the surface area, but also by increasing the size and number of surface irregularities, an anchor effect that has been difficult to obtain in the past is actively generated between the constituent yarns and the elastic layer, and the base fabric is obtained by the anchor effect. We focused on improving the adhesion between the elastic layer and the elastic layer.

However, in twisted yarns, the size and number of surface irregularities can be increased by adding twist and further strengthening the twist, but the strength decreases as the twist increases. That is, the increase in anchor effect and the increase in strength are contradictory. For this reason, when using as a constituent yarn of a shoe press belt base fabric that requires particularly high strength, the merit of using a twisted twisted yarn is scarce, and conventionally a sweet twist yarn has been used for a shoe press belt base fabric. It was.
In this regard, actually, when using various twisted yarns, three or four multifilament yarns having a lower twist of 15 times / inch or more are bundled, and further, the upper twist is 10 times / inch. In the multifilament twisted yarn that has been applied as described above and the number of lower twists is maintained at 1.5 times or more of the number of upper twists, even if a decrease in the strength of the constituent yarn itself is observed, the base fabric does not cause a decrease in strength. It has been found that an increase in strength may be observed even if it is slight.

The number S of twisted yarns X may be S ≧ 15, and usually S ≦ 30. Therefore, the number of primary twists S is normally 15 ≦ S ≦ 30. This number can be further 15.5 ≦ S ≦ 25.0, further 16.0 ≦ S ≦ 24.0, and further 16.5 ≦ S ≦ 23.0. And 17.0 ≦ S ≦ 22.0.
Further, the upper twist number Z of the plied yarns X may be Z ≧ 10, and usually Z ≦ 20. Therefore, the upper twist number Z is usually 10 ≦ Z ≦ 20. This number can be further 10.1 ≦ Z ≦ 19.0, further 10.2 ≦ Z ≦ 18.0, and further 10.3 ≦ Z ≦ 17.0. And 10.4 ≦ Z ≦ 16.0.
Furthermore, the ratio (S / Z) of the number of lower twists S and the number of upper twists Z (S / Z) should just be S / Z> = 1.5, and is normally S / Z <= 3.0. Therefore, usually, the ratio S / Z is 1.5 ≦ S / Z ≦ 3.0. This ratio can be further 1.55 ≦ S / Z ≦ 2.50, further 1.60 ≦ S / Z ≦ 2.25, and further 1.65 ≦ S / Z ≦ 2. 0.00, and 1.70 ≦ S / Z ≦ 1.95.
In addition, the number of twists of the plied yarns X is measured using a tester in accordance with JIS R3912: 2014 (reinforcing yarn-testing method of number). However, in the present invention, the number of twists per 25.4 mm (twist number) is specified.

  The material constituting the plied yarn X will be described later. In particular, when the plied yarn X is made of a polyamide-based resin (particularly when it is made of nylon 6 or nylon 66), the number of lower twists S is 15. 0 ≦ S ≦ 23.0 is preferable, 15.5 ≦ S ≦ 22.0 is more preferable, and 16.0 ≦ S ≦ 21.0 is particularly preferable. Among the above, the upper twist number Z is preferably 10.0 ≦ Z ≦ 15.0, more preferably 10.1 ≦ Z ≦ 14.0, and particularly preferably 10.2 ≦ Z ≦ 13.0. Among the above, the ratio (S / Z) is preferably 1.50 ≦ S / Z ≦ 2.20, more preferably 1.55 ≦ S / Z ≦ 2.10, and 1.60 ≦ S / Z ≦. 2.00 is particularly preferable.

On the other hand, when the plied yarn X is made of a polyester resin (particularly when it is made of polyethylene terephthalate), the lower twist number S is preferably 20.0 ≦ S ≦ 30.0 among the above.
21.0 ≦ S ≦ 29.0 is more preferable, and 22.0 ≦ S ≦ 28.0 is particularly preferable. Among the above, the number of upper twists Z is preferably 13.0 ≦ Z ≦ 20.0, more preferably 13.5 ≦ Z ≦ 19.5, and particularly preferably 14.0 ≦ Z ≦ 19.0. Among the above, the ratio (S / Z) is preferably 1.50 ≦ S / Z ≦ 3.00, more preferably 1.60 ≦ S / Z ≦ 2.75, and 1.70 ≦ S / Z ≦. 2.50 is particularly preferred. That is, compared to the plied yarns X made of a polyamide-based resin, the plied yarns X made of a polyester-based resin can set a larger number of twists.

Further, the fineness of the multifilament yarn constituting the twisted yarn X is not limited, but is preferably 220 dtex or more and 3300 dtex or less. By keeping the fineness of the multifilament yarn within this range, the surface irregularities can be effectively increased. This fineness can further be 230 dtex or more and 3000 dtex or less, can be further 240 dtex or more and 2800 dtex or less, can be further 250 dtex or more and 2500 dtex or less, can be further 260 dtex or more and 2200 dtex or less, and can be further 270 dtex. It can be set to 1900 dtex or less, and 280 dtex or more and 1700 dtex or less is particularly preferable.
Further, the number of single yarns constituting the multifilament yarn is not limited, but may be, for example, 20 or more and 1000 or less, further 30 or more and 600 or less, and further 40 or more and 300 or less. It can be.

The apparent outer diameter of such twisted yarns X is not limited, but can be, for example, 0.2 mm or more and 1.2 mm or less. In this range, when the twisted yarn X is used as the outermost layer warp, it is possible to maintain the elongation and strength of the base fabric particularly well while realizing a form (base fabric thickness, etc.) that can be directly replaced with a conventional product. Meanwhile, the adhesiveness between the plied yarns X and the elastic material can be improved. This apparent outer diameter can be further 0.3 mm or more and 0.9 mm or less, further 0.3 mm or more and 0.8 mm or less, and further 0.4 mm or more and 0.7 mm or less. .
In the present invention, in the plied yarn X in a state where no tension is applied, the width of the tenth thickest part randomly picked up is measured using an enlarged camera with a dimension measuring function, and the obtained measurement value The average value is the apparent outer diameter.

  The material constituting the twisted yarn X is not particularly limited. Polyester resin (polyethylene terephthalate, polybutylene terephthalate, etc.), polyamide resin (nylon 6, nylon 66, nylon 610, nylon 11, nylon 12, aramid, etc.), poly Ether ketone resins (polyether ether ketone, etc.), polyolefin resins (polyethylene, polypropylene, etc.), thermoplastic resin fluororesins (polyvinylidene fluoride, etc.) and the like can be used. These may use only 1 type and may use 2 or more types together. Among these, polyester resins and / or polyamide resins are preferable, and polyamide resins are more preferable. Abrasion resistance (for example, abrasion resistance to polyester monofilament) can be sufficiently obtained by using a polyamide-based resin.

Examples of polyamide resins include aliphatic polyamides and aromatic polyamides. These may use only 1 type and may use 2 or more types together. Of these, examples of the aliphatic polyamide include nylon 6, nylon 66, nylon 610, nylon 11, and nylon 12. These may use only 1 type and may use 2 or more types together. Moreover, aramid is mentioned as an aromatic polyamide. The aramid may be para-aramid, meta-aramid, or both.
Among these, nylon 6 or nylon 66 is particularly preferable from the viewpoints of mechanical strength, wear resistance, specific gravity, and the like.

As described above, the base fabric 2 includes the twisted yarns X ₂₁₁ as the outermost layer warp 211 on the felt side 2 a. The twisted yarns X ₂₁₁ may be used as the warp of all the outermost layer warps 211 on the felt side 2 a of the base fabric 2 (that is, 100% with respect to the total number of the outermost layer warps 211). You may use it only for some of them. When using only a part, it is preferable that 50% or more of the constituent yarns are all-twisted yarns X ₂₁₁ with respect to the total number of outermost layer warps 211. This ratio is more preferably 60% or more, further preferably 70% or more, particularly preferably 80% or more, and particularly preferably 90% or more.

As described above, the outermost layer warp 211 on the felt side 2 a can include other constituent yarns (hereinafter simply referred to as “other constituent yarns”) other than the twisted yarns X ₂₁₁ . The other component yarn may be any yarn, but is usually a filament yarn. In addition, a monofilament or a multifilament may be used. Furthermore, it may be a monofilament twisted yarn (single twisted yarn) in which two or more monofilament single yarns are bundled (usually 6 or less) and twisted, and two or more monofilament yarns (usually 6 or less) are bundled together. A multifilament twisted yarn (other twisted yarns other than twisted yarns X) twisted together may be used. Furthermore, the material which comprises other constituent yarn is not limited, For example, the various materials which can comprise the above-mentioned twisted yarn X are applicable.

  Among these, a single twisted yarn composed of three or four monofilaments can be employed. Further, the number of twists of the single twisted yarn is preferably 3.5 times or more and 8.5 times or less per 25.4 mm, and further, the apparent outer diameter is preferably 0.15 mm or more and 0.40 mm or less. . The number of twists and the apparent outer diameter depend on the method for measuring the number of twists and the apparent outer diameter of the various yarns X described above.

The base fabric 2, in addition to using plied yarns _{X 211} as the outermost layer warp 211 of the felt side 2a, at the same time, it is possible to use a ply yarn _{X 214} as the outermost layer warp 214 of the shoe side 2b (refer to FIG. 2) . That is, the plied yarn X can be included as the outermost layer warp on both the felt side 2a and the shoe side 2b. These plied yarns X ₂₁₁ and plied yarns X ₂₁₄ may be the same plied yarns X, but may be plied yarns X having different numbers of twists and / or different materials (constituent materials).
Further, as in the case of the plied yarns X ₂₁₁ , the plied yarns X ₂₁₄ are used as warps of all the outermost layer warp yarns 214 on the shoe side 2 b of the base fabric 2 (that is, 100% with respect to the total number of outermost layer warp yarns 214). It may be used, but may be used only for a part of the outermost layer warp 214. When using only a part, it is preferable that 50% or more of the constituent yarns are all-twisted yarns X ₂₁₄ with respect to the total number of outermost layer warp yarns 214. This ratio is more preferably 60% or more, further preferably 70% or more, particularly preferably 80% or more, and particularly preferably 90% or more.

Similarly to the case of the plied yarns X ₂₁₁ , the outermost layer warp 214 on the shoe side 2 b can include other constituent yarns other than the plied yarns X ₂₁₄ . The other component yarn may be any yarn, but is usually a filament yarn. In addition, a monofilament or a multifilament may be used. Furthermore, it may be a monofilament twisted yarn (single twisted yarn) in which two or more monofilament single yarns are bundled (usually 6 or less) and twisted, and two or more monofilament yarns (usually 6 or less) are bundled together. A multifilament twisted yarn (other twisted yarns other than twisted yarns X) twisted together may be used. Furthermore, the material which comprises other constituent yarn is not limited, For example, the various materials which can comprise the above-mentioned twisted yarn X are applicable.

  On the other hand, as described above, the base fabric 2 can include the twisted yarns X as the outermost layer warp 211 on the felt side 2a and the outermost layer warp 214 on the shoe side 2b, but is not included in other warps. It can be. In other words, in the case of a warp triple woven fabric, the intermediate layer warp 212 can be a constituent yarn that is not the twisted yarn X (see FIG. 4). In the case of a warp woven fabric, the intermediate layer warp yarns 212 and 213 may be constituent yarns that are not the twisted yarns X (see FIGS. 1 to 3).

Multifilament plied yarns whose constituent material is a polyester resin (particularly polyethylene terephthalate) as the intermediate layer warp 212 in the case of a warp woven fabric or the intermediate layer warp 212 or 213 in the case of a warp woven fabric (Hereinafter, simply referred to as “twisted yarn Y ₁ ”) is preferably included. This number of twist plied yarn Y ₁ is not limited, the number of twist S is preferably 3 ≦ S <12, more preferably 4 ≦ S ≦ 10. The upper twist number Z is preferably 3 ≦ Z <8, and more preferably 3.5 ≦ Z ≦ 7.5. The ratio (S / Z) is preferably 0.7 ≦ S / Z <2.0, and more preferably 0.8 ≦ S / Z ≦ 1.8.
Although not fineness of multifilament yarn constituting the plied yarn _{Y 1} is limited, it is preferably from more than 500 dtex 3300 dtex, more preferably not more than more than 700 dtex 2200 dtex. In particular, the fineness of the multifilament yarn of the plied yarn Y is preferably 2 times or more (usually 5 times or less) of the fineness of the multifilament yarn of the plied yarn X.

Further, as the intermediate layer warp 212 or 213 in the case of a warp woven fabric, a multifilament plied yarn (hereinafter simply referred to as “twisted yarn Y ₂ ”) whose constituent material is a polyamide-based resin (particularly nylon 6 or nylon 66). Is preferably included). This number of twists of plied yarn Y ₂ is not limited, the number of twist S is preferably 4 ≦ S <15, more preferably 5 ≦ S ≦ 10. The upper twist number Z is preferably 3 ≦ Z <10, and more preferably 3.5 ≦ Z ≦ 9.5. The ratio (S / Z) is preferably 0.8 ≦ S / Z <1.5, and more preferably 0.85 ≦ S / Z ≦ 1.45.
Although not the fineness of the multifilament yarn constituting the plied yarn _{Y 2} is limited, it is preferably from more than 220 dtex 1670 dtex, more preferably not more than than 280dtex 1100dtex. In particular, the fineness of the multifilament yarn of the plied yarn Y is preferably less than twice (usually 0.5 times or more) of the fineness of the multifilament yarn of the plied yarn X.

Moreover, in the base fabric 2, the number of warps constituting the outermost layer on the felt side 2a is not limited, but is preferably 8 or more and 18 or less per 25.4 mm. This value is further preferably 8.5 or more and 17 or less, more preferably 9 or more and 16 or less, and particularly preferably 9.5 or more and 15 or less.
On the other hand, in the base fabric 2, the number of warps constituting the outermost layer on the shoe side 2b is not limited, but it is preferably 8 or more and 18 or less per 25.4 mm. This value is further preferably 8.5 or more and 17 or less, more preferably 9 or more and 16 or less, and particularly preferably 9.5 or more and 15 or less.

  The shoe press belt base fabric of the present invention only needs to be used for papermaking, and its shape, size, thickness and other dimensions are not limited and are widely used in the papermaking field. Specifically, a shoe press belt base fabric, a transfer belt base fabric, a calender belt base fabric, etc. are mentioned.

[2] Shoe Press Belt The shoe press belt 1 (see FIG. 5) includes an elastic layer 3 formed of an elastic material and the shoe press belt base fabric 2 described above. The shoe press belt base fabric 2 is embedded in at least the elastic layer 3.

With this configuration, the shoe press belt 1 can obtain the advantageous operations and effects of the shoe press belt base fabric 2 as they are in the shoe press belt 1.
The degree of embedding of the base fabric 2 is not particularly limited, but it is preferable that the entire base fabric 2 is completely embedded (that is, embedded) in the elastic layer 3.

Specifically, as shown in FIG. 5, a shoe press belt 1 can be obtained. That is, the shoe press belt 1 has a felt side 1a surface and a shoe side 1b surface opposite to the felt side 1a. And the felt side elastic layer laminated | stacked on the felt side 2a of the base fabric 2 and the base fabric 2 (The elastic material is impregnated from the felt side 2a of the base fabric 2, and is penetrated into the base fabric 2 and solidified). 31 is provided. That is, in the shoe press belt 1, the elastic material is arranged so that the constituent yarns constituting the felt side 2a of the base fabric 2 are embedded. As shown in FIG. 5, the felt-side elastic layer 31 can have a drainage groove 311 on the surface thereof.
On the other hand, the base fabric 2 and the shoe-side elastic layer laminated on the shoe side 2b of the base fabric 2 (the elastic material is impregnated from the shoe side 2b of the base fabric 2 and infiltrated into the base fabric 2 and solidified). 32.

  The method for embedding the base fabric 2 in the elastic layer 3 is not particularly limited. For example, after the base fabric 2 is immersed in the raw material (elastic material) constituting the elastic layer 3 and the base fabric 2 is impregnated with the raw material, It can be buried by solidifying this raw material. Also. After the raw material is applied to the base fabric 2 (spray coating, brushing, etc.) and impregnated with the raw material in the base fabric 2, it can be embedded by solidifying the raw material.

  The elastic material constituting the elastic layer 3 is not particularly limited, but the viscosity is low so that the base fabric 2 can be easily embedded in the elastic layer 3, that is, the raw material can easily pass between the constituent yarns constituting the base fabric 2. It is preferable to use a material. Specifically, an elastic resin that can be cured to exhibit elasticity is preferable, and examples of such a raw material include urethane prepolymers (cured to become urethane resins). The urethane prepolymer may be a one-component type or a two-component type.

  In the case of using a urethane resin (urethane prepolymer), the curing type is not particularly limited. For example, a water-curable urethane resin (such as a urethane resin in which a prepolymer having an NCO terminal is cured by reacting with moisture), Heat-curing type (urethane resin etc. containing polyisocyanate whose isocyanate group is protected by a protecting group, and the protecting group is dissociated and cured by heating), solvent-removing curing type (polymerized polymerized polyurethane as an organic solvent) Cured by removing the dispersion medium from the urethane emulsion emulsified and dispersed in a dispersion medium such as water. Urethane resin, etc.). These may use only 1 type and may use 2 or more types together.

Hereinafter, the present invention will be specifically described with reference to examples.
[1] Various twisted yarn X
(1) Manufacture of various twisted yarns X 18.5 times / 25.4 mm (that is, S = 18.5) was twisted on a multifilament yarn made of nylon 66 which is 460 dtex (72f). Next, three multifilament yarns were bundled and twisted 10.5 times / 25.4 mm (that is, Z = 10.5) to obtain plied yarns X. The twist ratio (S / Z) of the plied yarns X is 1.76.
In addition, the twist number S and the twist number Z are not values set in the twist yarn manufacturing machine at the time of manufacture, but are values actually measured from the various twisted yarns X actually obtained.

(2) Measurement of various characteristics of various twisted yarns X (2-1) Apparent outer diameter The various twisted yarns X placed in a state where no tension was applied were enlarged and photographed using an enlarged camera with a dimension measuring function. The image was acquired. Within this enlarged image, the widths of the tenth thickest portions randomly picked up were measured, and the average value of the obtained measured values was calculated. As a result, the apparent outer diameter was 0.630 mm.
A part of the image obtained above is shown in FIG. 6 (corresponding to an actual measurement of 3.8 mm).

(2-2) Number of concave portions (R) In the image obtained in (2-1) above, the number of concave portions R (see FIG. 6) included per 1 cm of the plied yarns X is picked up at 10 locations on one side (randomly picked up). ) And the average value of the obtained measurement values was calculated. As a result, the number of recesses R was 12 places.

(2-3) Concave depth (D _R )
Using the image obtained in (2-1) above, the depths D _R (see FIG. 8) of the ten recesses R randomly picked up were measured, and the average value of the obtained measurement values was calculated. . As a result, the recess depth _{D R} was 74.57Myuemu.
Incidentally, the recess depth D _R is Tonaria' were among the mountain (convex portion of the concavo-convex outline of the yarn formed by twisting), the recess R sandwiched between the mountain M ₁ and mountain M ₂ Is the depth. The recess depth _DR is specified by the following. That is, the left recess bottom of yama M ₁ is B ₁₁ , the right recess bottom is B _12, and the line segment connecting B ₁₁ and B ₁₂ is L ₁₁ . Segment is a line segment parallel to _{L 11,} the contact point between the distance _{H 1} is a line segment of maximum and _{L 12} (line _{L 12} and the mountain _{M 1} and _{L 11} of the tangent to the mountain _{M 1} Top T ₁ ). Similarly, the left recess bottom to _{B 21} of mountain _{M 2,} the right recess bottom and _{B 22,} the line segment connecting the _{B 21} and _{B 22} and _{L 21.} A line segment parallel to the line segment _{L 21,} contact between the distance _{H 2} is a line segment of maximum and _{L 22} (line _{L 22} and mountain _{M 2} and _{L 21} of the tangents to the mountain _{M 2} is top _T 2). Using H ₁ and H ₂ determined above, it is specified by “(H ₁ + H ₂ ) / 2” (= D _R ).

(2-4) Recessed area (S _R )
Using the image obtained in (2-1) above, the area S _R (see FIG. 9) of the ten recesses R was measured, and the average value of the obtained measurement values was calculated. As a result, the recess area _{S R} was 41.88 × 10 ³ μm ^2.
Incidentally, the concave area S _R, Tonaria' were among the mountain (convex portion of the concavo-convex outline of the yarn formed by twisting), the area of the recesses R sandwiched between the mountain M ₁ and mountain M ₂ It is. Recess area S _R is specified below. That is, the tangent common to Yama M ₁ and Yama M ₂ is L ₃ (the contact between line segment L ₃ and Yama M ₁ is the top T ₃ , and the contact between line segment L ₃ and Yama M ₂ is the top T ₄ ). Then, identified as enclosed area (hatched portion in FIG. 89) between the outline and the tangent L ₃ outlines the mountain M ₁ and Yama M _2.

(2-5) Yarn Strength Test Various strength characteristics of the various twisted yarns X were measured using a strong elongation tester (manufactured by Toyo Seiki Seisakusho, model “V10-D”). Specifically, using a twisted yarn X having a length of 60 cm, a distance between chucks of 200 mm, a test speed of 100 mm / min, strength at 1%, 2%, 3%, 5% elongation, cutting strength, cutting elongation Each characteristic of the degree was measured 5 times, and the average value was taken as each value. The results are shown in Table 1.

[2] Comparative yarn (conventional yarn)
(1) Manufacture of Comparative Example Yarn (Conventional Yarn) 9.2 times / 25.4 mm (ie, S = 9.2) twist of multifilament yarn made of nylon 66 which is 460 dtex (72f) gave. Subsequently, the three multifilament yarns were bundled and subjected to an upper twist of 6.7 times / 25.4 mm (that is, Z = 6.7) to obtain a conventional yarn which is a comparative product for the twisted yarns X. The twist ratio (S / Z) of this conventional yarn is 1.37.
In addition, the twist number S and the twist number Z are not values set in the twist yarn manufacturing machine at the time of manufacture, but are values actually measured from the various twisted yarns X actually obtained.

(2) Measurement of various properties of comparative example yarn (2-1) Apparent outer diameter As in the case of various twisted yarns X, the measured outer diameter was 0.646 mm.
A part of the obtained image is shown in FIG. 7 (corresponding to an actual measurement of 3.8 mm).
(2-2) Number of concave portions (R) As in the case of various twisted yarns X, the number of measured concave portions R was eight.
(2-3) Concave depth (D _R )
As with the plied yarns X, measured recess depth _{D R} was 59.51Myuemu.
(2-4) Recessed area (S _R )
As with the plied yarns X, recess area _{S R} measured was 32.28 × 10 ³ μm ^2.

(2-5) Yarn Strength Test Similarly to the case of various twisted yarns X, the measured 1%, 2%, 3%, 5%, 10% elongation strength, breaking strength, and breaking elongation are also shown in Table 1. .

[2] Manufacture of shoe press belt base fabric Using various twisted yarns X, a base fabric having the following constitution was obtained. Furthermore, the base fabric of Comparative Example 1 was obtained.
(1) Example 1 (trans-quadruple weave, see FIG. 1)
Outermost layer warp (211);
Various characteristics are as described above.
Second layer warp yarn (212); Twisted yarn Y ₂
Nylon 66 470 dtex multifilament (S = 9.2) 3 twisted (Z = 6.7) yarn (S / Z = 1.37).
Third layer warp (213); ply yarn _{Y 1}
A yarn (S / Z = 1.78) in which three 1100 dtex multifilaments (S = 8.9) made of polyethylene terephthalate are twisted (Z = 5.0).
Fourth layer warp (214); Monofilament A nylon 6 monofilament with a wire diameter of 0.35 mm.
Number of warp yarns: 15.5 yarns per outer layer to 4th layer / 25.4 mm (warp density)
Weft; Monofilament made of polyester with a wire diameter of 0.4mm Number of wefts: 56 / 25.4mm (weft density)
Organization;

(4) Comparative example (trans-quadruple weave)
Outermost layer warp (211); plied yarn Yarn (S / Z = 1.37) obtained by twisting three 470 dtex multifilaments (S = 9.2) made of nylon 66 (Z = 6.7).
Second-layer warp yarn (212); Twisted yarn Yarn (S / Z = 1.37) obtained by twisting three 470 dtex multifilaments (S = 9.2) made of nylon 66 (Z = 6.7).
Third layer warp yarn (213); plied yarn Yarn (S / Z = 1.78) obtained by twisting three 1100 dtex multifilaments (S = 8.9) made of polyethylene terephthalate (Z = 5.0).
Fourth layer warp (214); Monofilament A nylon 6 monofilament with a wire diameter of 0.35 mm.
Number of warps: 15.8 yarns / 25.4 mm each from the outermost layer to the fourth layer (warp density)
Weft: Monofilament made of polyester with a wire diameter of 0.40 mm Number of wefts: 58 / 25.4 mm (weft density)
Organization;

[3] Evaluation (1) Measurement of base fabric thickness The thickness of the shoe press belt base fabric obtained in the above [2] was measured using a digimatic indicator. Specifically, the thickness of 10 locations randomly selected from the shoe press belt base fabric obtained in [2] above was measured, and the average value of the measured values obtained was taken as the thickness of each base fabric. . The results are shown in Table 2.

(2) Measurement of strength characteristics Various strength characteristics of the shoe press belt base fabric obtained in [2] above were measured using a strength tester (Orientec Co., Ltd., model “RTG-1310”). . Specifically, a sample with a width of 10 mm × a length of 300 mm is used in the warp direction, the distance between chucks is 200 mm, a sample with a width of 10 mm × a length of 200 mm is used in the weft direction, the distance between chucks is 100 mm, and the test speed is 200 mm / min, 1%, 2%, 5%, 10% (only in the warp direction) in the warp direction and the weft direction, each of the properties at the time of elongation, the cutting strength and the cutting elongation were measured 5 times, The average value was taken as each value. The results are shown in Table 2.

  From the results shown in Table 1, the yarn of the example (twisted yarn X) has S = 18.5, Z = 10.5, and S / Z = 1.76. On the other hand, the yarn of the comparative example (conventional yarn) has S = 9.2, Z = 6.7, and S / Z = 1.37. Comparing these yarns, the number of recesses in the twisted yarn X is increased by 150% compared to the conventional yarn, the recess depth is also increased by 125.3%, and the recess area is 129.7%. It is increasing. That is, since the recess area increase of 129.7% is recognized in each recess increased to 150%, it can be understood that the increase of the recess area as a whole is extremely remarkable. This shows that a high anchor effect for the elastic layer is expected. On the other hand, the spun yarn X has an apparent outer diameter of only 2.5% despite the increase in the number of twists compared to the conventional yarn, and can be directly replaced with the conventional product (base fabric). It can be seen that the form is maintained.

Moreover, it turns out that intensity | strength has fallen in the whole range from the 1% elongation to cutting | disconnection with the various twisted yarn X with respect to the conventional thread | yarn.
However, when the strength as a base fabric after weaving is measured, as shown in Table 2, although it is inferior at an elongation of about 1%, in other elongation regions and cutting strength and cutting elongation, It turns out that there is almost no difference with the base fabric of a comparative example, and rather the base fabric of an example may be slightly better. Thus, it can be seen that the plied yarn X alone can maintain excellent properties in the base fabric even though it has strength properties inferior to those of conventional yarns.

  The shoe press belt base fabric and shoe press belt of the present invention are widely used in press parts relating to paper making in the papermaking field. Specifically, it is used as a shoe press belt base fabric and a shoe press belt in the manufacture of newspaper webs, printing information papers, sanitary papers, hybrid papers, cardboard base paper, white paperboard, and other papers. Furthermore, the configuration of the shoe press belt base fabric of the present invention is also suitable as the configuration of the base fabric of a transfer belt or calendar belt. Furthermore, the configuration of the shoe press belt of the present invention is also suitable as the configuration of a transfer belt or a calender belt.

1; shoe press belt, 1a; felt side, 1b; shoe side,
2; base fabric (shoe press belt base fabric), 2a; felt side, 2b: shoe side,
21; warp,
211; outermost layer warp on the felt side (first layer warp),
212; second layer warp (intermediate layer warp),
213; third layer warp (intermediate layer warp),
214; outermost warp on the shoe side,
22; weft,
3; elastic layer,
31; front side elastic layer (felt side elastic layer), 311; drainage groove,
32; back side elastic layer (shoe side elastic layer),
8; shoe press device 81; press roll 82; pressure shoe 83; felt 84; wet paper 85; press felt (felt);
D ₁ ; traveling direction,
D ₂ ; width direction,
X: various twisted yarns,
X ₂₁₁ ; various twisted yarns X which are outermost layer warps on the felt side,
X ₂₁₄ ; plied yarn X which is the outermost layer warp on the shoe side.

Claims (6)

A shoe press belt base fabric woven in a warp triple or warp quadruple using a warp extending in the running direction and a weft extending in the width direction,
Various warp yarns (X) are included in the warp yarns constituting the outermost layer on the felt side,
The plied yarns (X) are twisted yarns obtained by bundling three or four multifilament yarns with S twists / 25.4 mm of the lower twist and Z twists / 25.4 mm of the upper twist,
Said S and said Z satisfy | fill the following (1) thru | or (3), The shoe press belt base fabric characterized by the above-mentioned.
(1) S ≧ 15
(2) Z ≧ 10
(3) S / Z ≧ 1.5   The shoe press belt base fabric according to claim 1, wherein the multifilament raw yarn has a fineness of 220 dtex or more and 3300 dtex or less.   3. The shoe press belt base fabric according to claim 1, wherein the number of warps constituting the outermost layer on the felt side includes 8 to 18 warps per 25.4 mm.   4. The shoe press belt base fabric according to claim 1, wherein the warp constituting the outermost layer on the shoe side is a plied yarn (X).   The shoe press belt base fabric according to claim 4, wherein the number of warps constituting the outermost layer on the shoe side includes 8 or more and 18 or less warps per 25.4 mm.   A shoe press belt comprising: an elastic layer; and the shoe press belt base fabric according to claim 1 embedded in the elastic layer.