JP2006097181A - Wet paper web transfer felt and pressing device of paper machine having the paper web transfer felt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet paper web transfer felt easily washable, having good paper-releasing function in transfer of wet paper and excellent in smoothing function of the wet paper surface, and to provide a pressing device of a paper machine using the wet paper web transfer felt. <P>SOLUTION: A wet paper web transfer felt 100 comprises a base layer 11, a first butt layer 13B formed on the roll-side or the shoe-side surface of the base layer 11, a plurality of divided fibers 15A divided into fine fibers and a polymeric elastic material 25 impregnated between the fine fibers, and has a wet paper-contacting fiber layer 15 formed so as to make the fine fibers and the polymeric elastic material 25 direct contact with the wet paper 15 and a hydrophilic nonwoven fabric layer 23 positioned between the first butt layer 13A and the wet paper-contacting fiber layer 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a papermaking felt and a press device of a papermaking machine provided with the papermaking felt, and particularly preferably, a papermaking felt used in a press mechanism equipped with a shoe press and a shoe press provided with the papermaking felt. The present invention relates to a press machine for a paper machine.

  In general, a paper machine includes a wire part, a press part, and a dryer part. These wire part, press part, and dryer part are arranged along the conveyance direction of the wet paper in this arrangement order. The wet paper is transported while being successively delivered to the paper transporting tools arranged in the wire part, the press part, and the dryer part, and the water is squeezed out (ie, squeezed), and finally Dried in the dryer part. The press device arranged in the press part includes a plurality of press mechanisms arranged in series along the conveyance direction of the wet paper web. Each press mechanism includes a pair of endless belt-shaped paper transport felts and a pair of rolls (that is, a roll press) or rolls as presses that are vertically opposed to sandwich a part of each of the paper transport felts. A wet paper transported by a paper transporting felt that travels in the same direction at approximately the same speed, and rolls and rolls or rolls and shoes together with the paper transporting felt. By pressing, the paper transporting felt absorbs the water while squeezing the water from the wet paper. In such a paper machine, a roll press type paper machine in which a press device that presses a part of a paper transporting felt sandwiching a wet paper while being sandwiched between the rolls is provided in the press part. There is a shoe press type paper machine in which a press device that presses a part of the paper transporting felt that is sandwiched between a roll and a shoe is provided in the press part.

  In particular, with a shoe press type paper machine, a press zone (that is, a nip formed by a roll and a shoe) has a wider press zone than that of a more general roll press type paper machine. Since the time can be extended, the water squeezing is more excellent. However, in the part from the center of the pressurizing part between the roll and the shoe to the outlet, the pressure applied to the wet paper and the paper transport felt is suddenly released, so in this part the paper transport felt and the wet paper The volume expands rapidly. As a result, a negative pressure is generated in the paper transporting felt and the wet paper. Further, since the wet paper is made of fine fibers, a capillary phenomenon is also added, so that the water absorbed in the paper transporting felt is transferred to the wet paper again. Re-wetting occurs. Thus, the part from the center of the pressurization part between a roll and a shoe to an exit becomes a big factor which reduces the squeezing performance of the press apparatus of a paper machine.

  By the way, between the wire part and the press part, between the press mechanisms such as the first press area and the second press area of the press apparatus, and between the press part and the dryer part, the wet paper is transported in the next process. For example, it is necessary to deliver to a dryer canvas. Therefore, in particular, the paper transporting felt in a press machine not only has a wet paper squeezing function and a wet paper transporting function, but also smoothly separates the wet paper from the paper transporting felt when passing the wet paper to the next process (that is, papermaking). A paper separation function is required which facilitates the peeling of the wet paper from the conveying felt. In addition, the paper transporting felt of the press mechanism disposed on the downstream side in the wet paper transport direction in the press part further requires a smoothing function for smoothing the wet paper surface in particular.

  As a paper transporting felt that prevents rewetting of the paper transporting felt and blowing during pressing, one that is impregnated with an emulsion resin and has been devised on the wet paper side is known (Patent Document) 1). More specifically, the paper transporting felt has a bat layer formed on the surface of the base layer impregnated with an emulsion resin, and the wet paper side surface of the bat layer has a dense and chamois smooth surface. Thus, a barrier layer is formed by calendering, or a coarse fiber layer formed on the surface of the base layer is impregnated with an emulsion resin and a barrier layer (nonwoven fabric layer) is provided on the coarse fiber layer. Further, a fine fiber layer is formed on the barrier layer (nonwoven fabric layer), and the barrier layer prevents the emulsion resin from penetrating to the wet paper side surface of the paper transport felt. Felt rewetting and blowing are prevented, thereby making it possible to increase the papermaking speed.

  As a paper transport felt that improves the paper separation function during delivery of wet paper, a hydrophobic material is arranged on a part of the wet paper placement surface on which wet paper is placed and transported. (See Patent Document 2). More specifically, the paper transporting felt has a wet paper web made of either one of a polymer elastic member having a wet paper web mounting surface and a surface layer forming body disposed in the polymer elastic member as a hydrophobic material. In order to improve the paper separation function, the part that keeps water away from the placement surface and the part that condenses water are distributed in a dispersed manner, and the water film formed between the wet paper placement surface and the wet paper is destroyed. is there.

Also known is an improvement in the paper separation function by destroying a water film formed between the wet paper web surface and the wet paper web by protruding the fibrous body from the wet paper web surface of the paper transporting felt ( (See Patent Document 3). More specifically, the paper transporting felt includes a base, a machine side layer, and a wet paper web side layer having a polymer elastic portion such as urethane resin, and the surface of the polymer elastic portion is processed by polishing or the like. A part of the fibrous body mixed in the polymer elastic part is projected from the wet paper side surface.
U.S. Pat. No. 4,500,588 JP 2001-89990 A JP 2004-124274 A

  In the press machine of a paper machine, the paper transport felt is squeezed with very high pressure at the pressurization section (ie, nip), so the paper transport felt is contaminated (specifically, the additive contained in the wet paper) Components such as adhesives and glues are likely to adhere. Therefore, in the press device of the paper machine, since the life of the paper transporting felt (that is, the usable period of the paper transporting felt) is short, maintenance for frequently replacing the paper transporting felt with a new one is required. Needless to say, the frequency of replacing the paper transport felt is higher in the press device of the shoe press type paper machine than in the press device of the roll press type paper machine.

  In addition, in the press machine of a paper machine, the fibers on the surface of the bat layer that come into direct contact with the wet paper of the paper transporting felt are pulled off or broken by a very large pressure or friction at the pressurizing part (ie, nip). Drops (that is, so-called hair loss) occur remarkably. Most of the fibers that have fallen off and the fibers that have been cut off are discharged out of the press apparatus by a cleaning means such as a water shower and a suction box, but some of them may adhere to the surface of the wet paper. Since the dropped fibers and the cut fibers are thicker and harder than the wet paper fibers, the paper manufactured while the fibers are attached to the surface (that is, papermaking) may have poor printability. (More specifically, color loss may occur when printing). As described above, the hair removal on the surface of the batt layer that directly contacts the wet paper of the paper transporting felt deteriorates the quality of paper products such as printed matter. On the other hand, the surface of the bat layer becomes rough due to the hair removal of the fibers, which is a factor that significantly reduces the surface smoothness of the wet paper.

  However, it is difficult to simply replace the fibers that form the surface of the batt layer in direct contact with the wet paper of the paper transporting felt with fine fibers. As a specific reason, a needling process (one of the manufacturing processes of the paper transporting felt includes carding in the previous stage of the needling process, and the fiber web sheet after carding is planted by needling. When the fine fibers are carded in the previous stage in (.), A fiber lump (ie, a lump of fibers) is easily formed, and the fiber lump is implanted in the felt by needling immediately after carding, and the surface of the paper transporting felt. This is because relatively large unevenness is formed on the surface of the paper, so that the surface smoothness of the wet paper decreases.

  The paper transporting felt on which the wet paper side surface disclosed in Patent Document 1 is calendered has good surface smoothness and water impermeability (that is, does not allow water to pass from the wet paper side surface to the press side surface). Although the paper transporting felt is inferior in wet paper water extraction performance and paper separation performance, it is unsuitable for a press machine for a paper machine that requires the paper transporting felt to have a wet paper water extraction function and a high paper separation function. In such paper transport felt, a thin water film is easily formed between the smooth wet paper side surface and the wet paper, and the water film acts like an adhesive so that the wet paper is applied to the wet paper side surface. There is a high possibility of sticking. In addition, a paper transporting felt in which a nonwoven fabric layer is interposed between a coarse fiber layer on the base layer side and a fine fiber layer on the wet paper side that can include fiber clusters, which is disclosed in Patent Document 1, is also a wet paper squeezing function in the paper transporting felt. In addition, it is not suitable for a press machine of a paper machine that requires a high smoothing function.

  In addition, the paper transport felt disclosed in Patent Document 2 and Patent Document 3 has improved the paper separation function to some extent, but the entire bat layer made of ordinary fibers includes a polymer elastic member. Therefore, the paper transporting felt has low compression and recovery performance during pressing and is impermeable (that is, does not allow water to pass from the wet paper side surface to the press side surface). I can not expect. Further, since the fiber protruding from the polymer elastic member to the wet paper side is also relatively thick, the unevenness of the wet paper side surface of the papermaking press felt becomes large.

  The present invention has been made in view of the above-described circumstances, and the object thereof is to easily remove dirt and to have a good paper separating function at the time of delivery of the wet paper, and further to an excellent smoothing function of the wet paper surface. An object of the present invention is to provide a papermaking felt and a press device for a papermaking machine provided with the papermaking felt.

In order to achieve the object described above, a papermaking felt according to the present invention and a press machine for a papermaking machine provided with the papermaking felt are characterized by the following (1) to (12).
(1) It is arranged in a press device provided in a press part of a paper machine, forms a press mechanism together with the press in the press device, and is pressed by the press while sandwiching the wet paper, whereby the wet paper At least one paper transporting felt of a pair of paper transporting felts that absorbs water squeezed from,
The base layer,
A first batt layer formed on the wet paper web surface of the base layer;
A second butt layer formed on the press side surface of the base layer;
A plurality of divided fibers divided into fine fibers and a polymer elastic material impregnated between the fine fibers, and the first and second fibers so that the fine fibers and the polymer elastic material are in direct contact with the wet paper. A wet paper contact fiber layer formed on the wet paper surface of the vat layer;
A hydrophilic non-woven fabric layer disposed between the first batt layer and the wet paper web contact fiber layer;
With
The fine fibers are partially covered with the polymer elastic material on the surface of the wet paper contact fiber layer that is in direct contact with the wet paper.
(2) The wet paper web contact fiber layer of the paper transporting felt having the configuration of (1) includes 1% by weight to 10% by weight of the polymer elastic material.
(3) The fibers forming the wet paper contact fiber layer of the paper transporting felt having the configuration of (1) or (2) are composed of 15% to 100% by weight of the split fibers and the remaining non-split fibers.
(4) The fineness before splitting of each of the split fibers in the paper transporting felt having the structure according to any one of (1) to (3) is 3.3 dtex or less.
(5) The fineness before division of each of the divided fibers in the paper transporting felt having the configuration of (4) is 1.9 dtex.
(6) It is a press device of a paper machine provided with the paper transporting felt having the structure according to any one of (1) to (5).
(7) A press apparatus of a paper machine including a plurality of the press mechanisms having the paper transporting felt having the configuration described in any one of (1) to (3), wherein the plurality of press mechanisms are the above-described press mechanisms. It is arranged in series along the conveyance direction of the wet paper conveyed by the papermaking felt.
(8) The fineness before splitting of each of the split fibers in the press machine of the paper machine configured as described in (7) is 3.3 dtex or less.
(9) The fineness before splitting of each of the split fibers in the press of the paper machine configured as described in (8) above is 1.9 dtex.
(10) The press device of the paper machine having the structure according to any one of the above (6) to (9) is a closed draw type press device.
(11) The press device of the paper machine configured as described in any of (6) to (10) above is a press device of a shoe press type paper machine, and the press of the press device presses the paper transport felt. And a shoe press having a shoe.
(12) The press device of the paper machine configured as described in any one of the above (6) to (10) is a press device of a roll press type paper machine, and the press of the press device presses the paper transport felt. It is a roll press having a roll.

According to the paper transporting felt having the configuration (1), the wet paper contact fiber layer formed by dividing a plurality of divided fibers into fine fibers and then impregnating the polymer elastic material between the fine fibers is provided. Since it is formed on the surface of the first butt layer of the paper transporting felt so as to be in direct contact with the wet paper, the surface smoothness of the wet paper contact fiber layer can be improved. High quality paper with a surface can be made. The surface of the wet paper contact fiber layer is a surface in which fine fibers formed by dividing the split fibers are partially covered with a polymer elastic material. Since there are some irregularities due to the protrusion of minute fine fibers, the water film between the wet paper contact fiber layer and the wet paper is easily broken or difficult to form, and therefore the paper separation from the paper transporting felt is good, The wet paper can be easily transferred to the papermaking felt in the next process.
Further, the fine fibers formed by dividing the divided fibers are bonded to some extent by the polymer elastic material and are partially covered, so that the so-called hair removal phenomenon hardly occurs and the falling off from the paper transporting felt is prevented. As a result, the paper manufactured by the paper machine using the paper transporting felt according to the present invention has a very smooth surface, and the life of the paper transporting felt (that is, the usable period of the paper transporting felt) is increased. Since it is long, the maintenance frequency for replacing the paper transport felt with a new one can be reduced.
In addition, since the hydrophilic nonwoven fabric layer is disposed between the first batt layer and the wet paper contact fiber layer, the polymer elastic material impregnated from the surface side of the wet paper contact fiber layer is a hydrophilic nonwoven fabric layer. It is not blocked and impregnated even deeper than the hydrophilic nonwoven fabric layer (that is, the first vat layer, the base layer, and the second vat layer), and only the wet paper contact fiber layer (for example, about 0.5 mm from the surface) ) A polymer elastic material is disposed.
Therefore, since the paper transporting felt has water permeability and appropriate compression and recovery functions (cushioning properties), it can effectively exhibit water squeezing. In addition, dirt temporarily attached to the wet paper contact fiber layer containing the polymer elastic material (specifically, components such as additives and glue contained in the wet paper) is an appropriate compression and recovery function of the paper transporting felt. Due to (cushioning property), it easily peels off from the surface of the wet paper contact fiber layer and shifts to wet paper. That is, the papermaking felt has a high self-cleaning function. As a result, it is difficult for dirt to remain on the paper transporting felt, and the dirt transferred to the wet paper is originally included as a component in the wet paper, and thus does not affect the quality of the wet paper. In addition, retransfer of moisture once absorbed by the papermaking felt from the wet paper into the wet paper (that is, a so-called rewetting phenomenon) is prevented by the hydrophilic nonwoven fabric layer.
The wet paper contact fiber layer of the paper transporting felt according to the present invention is obtained by dividing a plurality of divided fibers into fine fibers and impregnating a polymer elastic material between the fine fibers. The division is preferably performed in a needling process which is one of the papermaking felt manufacturing processes. If the divided fibers are divided into fine fibers by carding at the previous stage in the needling process, a fiber lump (that is, a lump of fibers) is easily formed, and the fiber lump is implanted in the felt by needling, and the paper transporting felt. Since relatively large irregularities are formed on the surface, the surface smoothness of the wet paper decreases. The splitting of the split fibers may be performed, for example, by needling using a fine count needle in the needling process, or split fibers that are planted with a brush of a brushed machine (commonly called 薊) after the needling process. Or the paper transporting felt may be scoured (washed with water) after the needling step. That is, the splitting of the split fibers may be performed in any process as long as it is after the carding that is the previous stage in the needling process and before the impregnation with the polymer elastic material. Then, the polymer elastic material is impregnated between the fine fibers after dividing the divided fibers into fine fibers.
In the impregnation of the polymer elastic material, after dividing a plurality of divided fibers into fine fibers, a synthetic resin such as a water-based urethane resin, a water-based acrylic resin, a water-based epoxy resin, a water-based synthetic rubber (that is, a water-based emulsion resin) is used at room temperature. It is carried out by applying with a roll or spraying with a spray and impregnating between fine fibers, and further heating and curing.
According to the paper transporting felt of the configuration (2), the wet paper contact fiber layer contains 1% to 10% by weight of the polymer elastic material, so that all pores between the fibers are filled with the polymer elastic material. It is not done and moderate pores are maintained. In other words, the wet paper contact fiber layer has a porous structure, disperses a water film formed between the wet paper contact fiber layer and the wet paper, and has an appropriate cushioning property. As a result, paper separation from the paper transporting felt is good, and the paper transporting felt has a smooth surface that absorbs moisture squeezed out of the wet paper by expanding and contracting due to press press in the press mechanism. Can do. In addition, by changing the impregnation ratio of the polymer elastic material, the paper transporting felt can have characteristics (paper releasability, surface smoothness, water squeezing, etc.) optimum for each press mechanism. The reason why the ratio of the polymer elastic material to be impregnated is 1% by weight or more is that when the ratio of the polymer elastic material is less than 1% by weight, almost no effect of the polymer elastic material can be expected. The reason why the ratio of the polymer elastic material is 10% by weight or less is that when the ratio of the polymer elastic material is more than 10% by weight, the cushioning property and water permeability of the paper transporting felt are lost, and the wettability of the wet paper decreases. Because.
According to the paper transporting felt having the configuration (3), the fibers forming the wet paper contact fiber layer are composed of 15% to 100% by weight of the split fibers and the remaining non-split fibers. It may be made of fibers, or the characteristics of the paper transporting felt may be changed by appropriately changing the blend ratio of the split fibers and the non-split fibers. Here, the weight ratio of the blended fibers is defined by “weight of split fibers / (weight of split fibers + weight of non-split fibers) × 100”. The non-divided fibers are ordinary short fibers that are not divided even when carding or needling, or in the paper transporting felt manufacturing process after the needling process.
There is an inverse relationship between surface smoothness and water squeezing, which is a characteristic required for paper transport felt, and the water squeezing tends to be worse when the density of paper transport felt is increased to improve the smoothing performance of the wet paper surface. There is. On the other hand, a plurality of press mechanisms arranged from the upstream to the downstream in the conveyance direction of the wet paper to be transported are required to have slightly different functions, and the paper conveyance felt of the press mechanism arranged on the upstream side is squeezed. Water-based printing is important, and the paper transporting felt of the press mechanism disposed on the downstream side is required to have a smoothing performance on the surface of the wet paper. Therefore, by appropriately changing the blending ratio of the non-divided fibers and the divided fibers, it is possible to give the paper transporting felt the characteristics (surface smoothness, water squeezing, etc.) that are optimal for each press mechanism.
According to the paper transporting felt configured as described in (4) above, since the fineness of each split fiber before splitting is 3.3 dtex or less, even if the fineness before splitting of the split fibers is 3.3 dtex The fineness of the fine fibers formed by dividing the divided fibers is smaller than 3.3 dtex. In this way, if the wet paper contact fiber layer including the split fibers that become fine fibers with a fineness close to that of the wet paper fibers by dividing is formed, a high quality paper with excellent surface smoothness is obtained. Can be manufactured. Further, by impregnating the polymer elastic material between such fine fibers, the surface of the wet paper contact fiber layer can be further smoothed and a surface having good paper releasability. For example, even if fine fibers that have fallen off or cut off from the wet paper contact fiber layer (that is, fine fibers formed by dividing the split fibers) adhere to the wet paper surface to some extent due to the so-called depilation phenomenon, the fine fibers are extremely Because it is thin, it does not degrade the quality of wet paper.
Further, according to the paper transporting felt having the configuration (5), the fineness before splitting of each split fiber is 1.9 dtex, which is more preferable. In addition, about a non-divided fiber, what has the fineness of 1.9 dtex (namely, the same value as the fineness before division | segmentation of a divided fiber)-6 dtex is desirable, for example.
According to the press machine of the paper machine having the configuration (6), since the paper transport felt according to any one of the above (1) to (5) is provided, the above-described operations and effects are excellent.
A press apparatus for a paper machine comprising a plurality of press mechanisms having a paper transporting felt of any of the configurations (1) to (3) as in the press apparatus for a paper machine having the configuration (7) above, If a plurality of press mechanisms are arranged in series along the conveying direction of the wet paper transported by the paper transporting felt, the next paper transport can be efficiently squeezed from the wet paper and the paper can be easily separated. Suitable for passing to felt. That is, according to the press device of the paper machine configured as described in (7) above, a large amount of water can be effectively squeezed out from the wet paper containing a lot of water, and the wet paper is surely put on the next paper transport felt. Paper can be operated at high speed.
In particular, a wet paper contact containing a relatively large amount (within a range of 1 wt% to 10 wt%) of a polymer elastic material in a press mechanism arranged on the downstream side in the wet paper transport direction among a plurality of press mechanisms. If a paper transport felt with a fiber layer is placed, the water permeability may be slightly reduced compared to a paper transport felt with a small amount of impregnation of the polymer elastic material. Therefore, the wet paper transported at a high speed can be surely passed to the next process, and the paper can be made at a high speed.
According to the press machine of the paper machine configured as described in (8) above, the fineness before division of each of the divided fibers is 3.3 dtex or less, so that the fineness before division of the divided fibers was 3.3 dtex. Even so, the fineness of the fine fibers formed by dividing the divided fibers is smaller than 3.3 dtex. In this way, if the wet paper contact fiber layer including the split fibers that become fine fibers with a fineness close to that of the wet paper fibers by dividing is formed, a high quality paper with excellent surface smoothness is obtained. Can be manufactured.
Further, according to the press machine of the paper machine having the configuration of (9), the fineness before splitting of each split fiber is 1.9 dtex, which is more preferable.
According to the press device of the paper machine configured as described above (10), the wet paper web is transported in a state of being sandwiched between a pair of paper transport felts by using a closed draw type press device. Accordingly, the wet paper web can be transported at an extremely high speed without applying a force to the wet paper which is weak in strength and easily cut. Therefore, efficient papermaking becomes possible.
According to the press device of the paper machine having the configuration of the above (11), the press zone of the press part (that is, the nip formed by the roll and the shoe) is wide by using the press device of the shoe press type paper machine. Since the pressurization time can be lengthened thereby, the water squeezing performance is higher, and the so-called re-wetting phenomenon can be prevented, so that the water squeezing performance in the portion from the center of the pressurization part between the roll and the shoe to the outlet is high. .
According to the press machine of the paper machine having the configuration of (12), the press machine of the roll press type paper machine can receive the advantages of the excellent actions and effects as described above.

  ADVANTAGE OF THE INVENTION According to the present invention, there is provided a paper transporting felt that is easy to remove dirt and has a good paper separating function when delivering wet paper, and further excellent in the smoothing function of the wet paper surface, and a paper machine equipped with the paper transporting felt. A pressing device can be provided.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

  1 is a longitudinal sectional view of a paper transporting felt 100 according to the present invention, FIG. 2 is an enlarged sectional view of a split fiber forming a wet paper contact fiber layer of the paper transporting felt shown in FIG. 1, and FIG. It is a top view which shows schematic structure of one Embodiment of the press apparatus of the paper machine which concerns.

  As shown in FIG. 1, the paper transporting felt 100 includes a base layer 11, a batt layer 13 (a first vat layer 13 </ b> A and a second vat layer 13 </ b> B), a hydrophilic nonwoven fabric layer 23, and a wet paper web contact fiber layer 15. . More specifically, the first butt layer 13A is formed on the surface of the base layer 11 on the wet paper web side, and the press side of the base layer 11 (more specifically, one side of a pair of rolls or one of a roll and a shoe). The second bat layer 13B is formed on the surface of the first bat layer, the hydrophilic nonwoven fabric layer 23 is formed on the wet paper web surface of the first bat layer 13A, and the hydrophilic nonwoven fabric layer 23 is in direct contact with the wet paper web. A wet paper contact fiber layer 15 is formed on the wet paper surface. The base layer 11, the batt layer 13 (the first batt layer 13A and the second batt layer 13B), the hydrophilic nonwoven fabric layer 23, and the wet paper web contact fiber layer 15 are intertwined and integrated by needling.

  The base layer 11 is for imparting strength to the paper transporting felt 100. For example, synthetic fibers such as nylon 6, nylon 66, and the like excellent in wear resistance, fatigue resistance, stretch characteristics, antifouling properties, and the like. In addition, a woven fabric or a yarn material made of natural fibers such as wool, etc., which are stacked without being woven, or a film-like one can be used as appropriate. In the present embodiment, the base layer 11 is woven.

  The batt layer 13 (the first batt layer 13A and the second batt layer 13B) is a non-divided fiber layer formed by staple fibers 17 having a fineness of 6 dtex or more (generally about 17 dtex). . As the material for forming the bat layer 13, a material similar to that of the base layer 11 is appropriately used. The second butt layer 13B may be omitted depending on the characteristics required for the papermaking felt 100.

  The hydrophilic nonwoven fabric layer 23 is formed of a hydrophilic nonwoven fabric having a high density by laminating non-divided fibers that are thinner than the fibers forming the batt layer 13, for example, having a fineness of 4 dtex or less. As an example of the hydrophilic nonwoven fabric forming the hydrophilic nonwoven fabric layer 23, it is constituted by laminating fibers obtained by melting and spinning a resin such as nylon, for example, spunbond formed by laminating continuous filaments. Nonwoven fabrics, nonwoven fabrics obtained by drawing molten polymer with hot air into fine fibers, and the like.

  In order to effectively prevent rewetting, the hydrophilicity of the hydrophilic nonwoven fabric layer 23 is such that when the moisture content of the hydrophilic nonwoven fabric layer 23 is adjusted to 30 to 50%, the contact angle with water is It is desirable to make it 30 degrees or less. In addition, the moisture content of the hydrophilic nonwoven fabric layer 23 is calculated | required from (water / whole weight) x100.

  The fibers forming the wet paper contact fiber layer 15 are composed of split fibers 15A (in other words, the split fibers 15A occupy 100% by weight of the fibers forming the wet paper contact fiber layer 15). As shown in FIG. 2, each of the split fibers 15A forming the wet paper contact fiber layer 15 is split into a plurality of fine fibers (a petal portion 19 and a stem portion 21 described later) by pressing, friction, or hot water washing. A composite fiber having a structure and having a fineness of 3.3 dtex or less is preferable. In the present embodiment, a fiber having a circularity of 1.9 dtex and a length of 51 mm is used. The split fiber 15A is composed of, for example, seven parts such as a six-section fan-shaped petal portion 19 and a stem portion 21 having a substantially cross-sectional asterisk shape that joins the side surfaces of adjacent ones of the petal portions 19. It is integrated into a circular cross section and is formed to be separable.

  The material of the split fibers 15A is made of, for example, nylon 6 (ie, N6), and the stem portion 21 is made of, for example, polybutylene terephthalate (ie, PBT). Specific examples of such split fibers 15A include trade name “PA31”: manufactured by Toray Industries, Inc. The reason why the fineness of the split fiber 15A is set to 3.3 dtex or less is mainly for facilitating the formation of the wet paper contact fiber layer 15, specifically, in the manufacturing process of the papermaking felt 100 itself. When carding at a previous stage in a needling process, the split fibers 15A are not split, and a splitting process performed prior to impregnation with the polymer elastic material (for example, needling, a raising process by a raising machine, hot water by scouring) This is for the purpose of being effectively divided when washing, etc.).

  The fiber forming the wet paper web contact fiber layer 15 is not limited to the split fiber 15A. Specifically, the fibers forming the wet paper contact fiber layer 15 may be composed of 15% to 100% by weight of split fibers and the remaining non-split fibers. The non-divided fibers are normal short fibers that are not divided during carding, needling, or in the papermaking felt manufacturing process after the needling process. Further, as the non-divided fiber, for example, a staple fiber having a fineness of 1.9 dtex (that is, the same value as the fineness before dividing the divided fibers) to 6 dtex is desirable.

  The polymer elastic material 25 is impregnated from the wet paper web side of the wet paper contact fiber layer 15 between the fine fibers formed by dividing the plurality of divided fibers 15A. Specifically, the wet paper contact fiber layer 15 includes 1% by weight to 10% by weight of the polymer elastic material 25. The polymer elastic material 25 divides the plurality of divided fibers 15A into fine fibers, and then at room temperature, a synthetic resin such as a water-based urethane resin, a water-based acrylic resin, a water-based epoxy resin, a water-based synthetic rubber (that is, a water-based emulsion resin), It is applied by a roll or sprayed by a spray so as to be impregnated between fine fibers, and then heated and cured. At this time, since the hydrophilic nonwoven fabric layer 23 is disposed under the wet paper web contact fiber layer 15 (that is, the wet paper web side surface of the first batt layer 13A), the polymer elastic material 25 is a hydrophilic nonwoven fabric layer. 23 prevents further impregnation and does not impregnate the first batt layer 13A, the base layer 11 and the second batt layer 13B.

The basis weight of each constituent element of the standard example of the paper transport felt 100 configured as described above is such that the basis weight of the wet paper web contact fiber layer 15 is 200 g / m ² and the basis weight of the hydrophilic nonwoven fabric layer 23 is 40 g / m ² . m ² , the basis weight of the first batt layer 13A is 400 g / m ² , the basis weight of the base layer 11 is 650 g / m ² , and the basis weight of the second batt layer 13B is 100 g / m ² . Further, the wet paper contact fiber layer 15 includes 5% by weight (10 g / m ² ) of the polymer elastic material 25.

Measuring basic weights of respective elements of a light-weighted example of the paper transporting felt 100, the base weight of 100 g / ^{m 2} of the wet paper contacting fibrous layer 15, a basis weight of 40 g / ^{m 2} of the hydrophilic nonwoven fabric layer 23, the the basis weight of the first batt layer 13A is a basis weight of 200 g / ^{m 2} and the base layer 11, is 200 g / ^{m 2,} the second batt layer 13B is omitted. Further, the wet paper contact fiber layer 15 includes 1% by weight (1 g / m ² ) of the polymer elastic material 25.

In addition, the basis weight of each component of the example in which the paper transport felt 100 is weighted is such that the basis weight of the wet paper web contact fiber layer 15 is 300 g / m ² , the basis weight of the hydrophilic nonwoven fabric layer 23 is 40 g / m ² , The basis weight of the 1 batt layer 13A is 800 g / m ² , the basis weight of the base layer 11 is 1500 g / m ² , and the basis weight of the second batt layer 13B is 300 g / m ² . 10% by weight (30 g / m ² ) of the polymer elastic material 25 is included.

  A method for manufacturing the paper transporting felt 100 will be briefly described. First, a material in which the bat layer 13 is integrated on both surfaces of the woven base layer 11 by needling or the like is prepared. And after placing the hydrophilic nonwoven fabric layer 23 and the web of the split fiber 15A after carding on the surface of the first batt layer 13A, the web sheet of the split fiber 15A, the hydrophilic nonwoven fabric layer 23, the batt layer 13 and the base layer 11. Needle through 11 and entangle. During the carding step, the split fibers 15A can maintain a fineness of 1.9 dtex, so that, for example, the fiber mass generated when carded in a state of being divided into fine fibers (petals 19 and stems 21). Occurrence can be prevented.

  Next, the split fiber 15A is split into fine fibers (petals 19 and stems 21) by splitting such as needling, brushing of a brush raising machine, or hot water washing in a scouring process. A wet paper web contact fiber layer 15 having a smooth wet paper side surface covered with a polymer elastic material 25 not yet impregnated is formed. Then, the polymer elastic material 25 is applied to the wet paper web side surface by a roll or sprayed by spraying and impregnated between fine fibers, and then heated to cure the polymer elastic material 25. At this time, since the hydrophilic nonwoven fabric layer 23 is disposed in the lower layer of the wet paper web contact fiber layer 15, the polymer elastic material 25 is prevented from being impregnated into the lower layer than the hydrophilic nonwoven fabric layer 23. The layer 13A, the base layer 11, and the second batt layer 13B are not impregnated. Examples of the polymer elastic material 25 that can be used include synthetic resins such as water-based urethane resins, water-based acrylic resins, water-based epoxy resins, water-based synthetic rubbers (that is, water-based emulsion resins). It is appropriately selected in the range of 1% by weight to 10% by weight according to the characteristics required of the press mechanism to which the transport felt 100 is attached.

For example, in the paper transport felt 100 for pickup (paper transport felt arranged at the entrance of the press of the paper machine) manufactured in this way, the basis weight of the wet paper contact fiber layer 15 is 150 g / m ^2. The impregnation ratio of the polymer elastic material 25 is 1% by weight, the density of the whole fiber forming the paper transporting felt 100 is 0.420 g / cm ³ , and the air permeability is 25 cc / cm ² / sec (this value is JIS L 1096 is a mean value of values measured by applying a pressure of 125 Pa to the test piece of the paper transporting felt 100 by the Frazier method. Moreover, in the paper transporting felt 100 mounted on the third press mechanism of the multi-stage press device, for example, the basis weight of the wet paper web contact fiber layer 15 is 200 g / m ² , and the impregnation ratio of the polymer elastic material 25 is 3 wt. %, And the density of the whole fiber forming the paper transporting felt 100 is 0.450 g / cm ³ , and the air permeability is 15 cc / cm ² / sec. Further, for example, in the paper transporting felt 100 attached to the fourth press mechanism, the basis weight of the wet paper web contact fiber layer 15 is 250 g / m ² , the impregnation ratio of the polymer elastic material 25 is 5% by weight, and the paper transporting The density of the whole fiber forming the felt 100 is 0.500 g / cm ³ , and the air permeability is 5 cc / cm ² / sec.

  In addition, in order to make the paper transporting felt 100 having the optimum characteristics according to the type of paper to be made, the types of fibers forming the base layer 11, the batt layer 13, the hydrophilic nonwoven fabric layer 23, and the wet paper web contact fiber layer 15 respectively. , And the type and amount of impregnation of the polymer elastic material 25 are appropriately selected in consideration of characteristics or the like when combined or combined.

(Modification of paper transport felt 100)
As a preferred modification of the paper transporting felt 100, a wet paper having a blended fiber containing 30% by weight of 1.9 dtex split fibers 15A and the balance (ie, 70% by weight) of 3.3 dtex non-split fibers. The thing provided with the contact fiber layer is mentioned. In this case, the average thickness of the fibers forming the wet paper contact fiber layer is about 2.9 dtex. The base layer 11, the batt layer 13, the hydrophilic nonwoven fabric layer 23, and the polymer elastic material 25 are the same as described above. Since the wet paper contact fiber layer contains non-divided fibers that are not divided into fine fibers, the surface of the wet paper contact fiber layer does not become too dense, and an appropriate water permeability and uneven surface are ensured. It is possible to effectively squeeze water from W and to ensure good paper separation.

  Next, a press device 300 of a shoe press type paper machine equipped with a paper transporting felt 100 formed in an endless belt shape (annular shape) will be described with reference to FIG.

  As shown in FIG. 3, the press device 300 of the shoe press type paper machine has two press mechanisms, a first press mechanism 51 and a second press mechanism 53, along the wet paper W conveyance direction (arrow A direction). Is a so-called closed draw type press apparatus 300 arranged in series. By using a closed draw type shoe press type paper machine in which the wet paper W is conveyed and pressed in a state of being sandwiched between a pair of paper press felts 100 for shoe presses, the wet paper W is, for example, 1200 to 1400 m / It can be transported stably at a high speed such as min. As a result, paper can be made with extremely high efficiency as compared with an open draw type shoe press type paper machine.

  The first press mechanism 51 includes a pair of shoe press papermaking felts 100 (100A) and a first shoe disposed opposite to each other so as to form a first nip (in other words, a first pressure unit). 55 and a first roll 57 (in other words, a first shoe press). The second press mechanism 53 includes a pair of shoe press papermaking felts 100 (100B) and a second shoe disposed opposite to each other so as to form a second nip (in other words, a second pressurizing portion). 59 and a second roll 61 (in other words, a second shoe press). Normally, in consideration of wet paper squeezing performance and wet paper surface smoothing function, the amount of impregnation of the polymer elastic material 25 of the paper transporting felt 100A attached to the first press mechanism 51 is the second press mechanism. The amount of impregnation of the polymer elastic material 25 of the paper transporting felt 100 </ b> B attached to 53 is reduced. Specifically, the paper transporting felt 100A attached to the first press mechanism 51 is impregnated with 3% by weight of the polymer elastic material 25, and the paper transporting felt 100B attached to the second press mechanism 53 is 5% by weight. % Polymer elastic material 25 is impregnated. That is, the paper transport felt 100B in which the smoothing function of the wet paper surface is more important than the wet paper squeezing performance is used for the paper transport felt mounted on the second press mechanism 53 disposed on the downstream side.

  As shown in FIG. 3, the paper transport felt 100 (100A; 100B) may be employed as the upper and lower paper transport felts of the first press mechanism 51 and the second press mechanism 53, but the first press mechanism 51 and You may employ | adopt for the paper conveyance felt of either the upper and lower sides of the 2nd press mechanism 53. FIG. When the paper transporting felt 100 (100A; 100B) is mounted as one of the upper and lower paper transporting felts of the first press mechanism 51 and the second press mechanism 53, the other paper transporting felts are arbitrarily selected according to the papermaking characteristics. What is necessary is just to employ the paper transport felt. Further, only the paper transport felt 100 </ b> A or only the paper transport felt 100 </ b> B may be employed as the paper transport felt of the first press mechanism 51 and the second press mechanism 53.

  As shown in FIG. 3, the wet paper W carried out from the wire part (not shown) and delivered to the first press mechanism 51 is conveyed while being sandwiched between the pair of papermaking felts 100 </ b> A, and the first shoe 55. The water is squeezed by being pressurized by the first roll 57, and the squeezed water is absorbed from the porous wet paper contact fiber layer 15 of the papermaking felt 100A into the first butt layer 13A and the like. Next, the wet paper W is transferred to the second press mechanism 53 and conveyed while being sandwiched between the pair of papermaking felts 100 </ b> B, and is further squeezed by being pressurized by the second shoe 59 and the second roll 61. The squeezed water is absorbed from the porous wet paper contact fiber layer 15 of the papermaking felt 100B into the first batt layer 13A and the like.

  When the wet paper web W is transferred from the first press mechanism 51 to the second press mechanism 53, the wet paper web contact fiber layer 15 with which the wet paper web W comes into contact is porous, and an appropriate uneven surface is formed on the surface thereof. Since it is formed, it has good paper releasability, and is easily peeled off from the papermaking felt 100A and reliably delivered to the papermaking felt 100B. Further, the surface of the wet paper web contact fiber layer 15 that is in direct contact with the wet paper web W includes fine fibers divided by the split fibers 15A and the polymer elastic material 25 (in the case where the wet paper web contact fiber layer 15 also includes non-split fibers) Therefore, the wet paper web W having a smooth surface is pressurized, passed to a dryer part (not shown), and dried.

  The first shoe 55 and the first pressure part of the first roll 57 and the second shoe 59 and the second pressure part of the second roll 61 from the second pressure part to the outlet act on the wet paper W and the paper transport felts 100A and 100B. When the pressure that has been released is released, a rewetting phenomenon in which the moisture in the paper transporting felts 100 </ b> A and 100 </ b> B shifts to the wet paper W side will occur, but the hydrophilic nonwoven fabric layer 23 has a higher density than the vat layer 13. In addition, since the water permeability is low, the moisture in the batt layer 13 hardly penetrates the hydrophilic nonwoven fabric layer 23 and moves to the wet paper web contact fiber layer 15. Thereby, generation | occurrence | production of a rewet phenomenon is suppressed.

  As described above, as an example, the press apparatus 300 including the two-stage press mechanisms 51 and 53 has been described as an embodiment of the press apparatus of the shoe press type paper machine according to the present invention. Needless to say, it may be a press device provided or a press device in which a large number of press mechanisms are arranged in series (that is, arranged in parallel).

  Here, in order to deepen the understanding of the present invention, a configuration of an embodiment of a paper transporting felt according to the present invention and a configuration of an embodiment of a press device of a shoe press type paper machine equipped with the paper transporting felt will be briefly described.

The paper transporting felt 100 is arranged in a press device 300 provided in a press part of a shoe press type paper machine, and includes one shoe press having a roll (57; 61) and a shoe (55; 59) in the press device 300. A press mechanism (51; 53) is formed and pressed by the roll (57; 61) and the shoe (55; 59) while sandwiching the wet paper W, thereby absorbing the water squeezed from the wet paper W. At least one paper transport felt 100 of the pair of shoe press paper transport felts,
A base layer 11;
A first batt layer 13A formed on the surface of the base layer 11 on the wet paper web W side;
A second butt layer 13B formed on the surface of the base layer 11 on the roll (57; 61) side or the shoe (55; 59) side;
A plurality of divided fibers 15A divided into fine fibers and a polymer elastic material 25 impregnated between the fine fibers, and the first fibers so that the fine fibers and the polymer elastic material 25 are in direct contact with the wet paper web W. A wet paper web contact fiber layer 15 formed on the wet paper web side surface of the batt layer 13A;
A hydrophilic nonwoven fabric layer 23 disposed between the first batt layer 13A and the wet paper web contact fiber layer 15,
With
The fine fibers are partially covered with the polymer elastic material 25 on the surface of the wet paper contact fiber layer 15 that is in direct contact with the wet paper W.

  The wet paper contact fiber layer 15 includes 1% by weight to 10% by weight of the polymer elastic material 25. The fibers forming the wet paper contact fiber layer 15 may be composed of 15% to 100% by weight of split fibers and the remaining non-split fibers.

  A press device 300 of a shoe press type paper machine is a press device of a shoe press type paper machine provided with a plurality of press mechanisms having a paper transporting felt 100 (100A; 100B), and the plurality of press mechanisms (51, 53). Are arranged side by side in series (that is, in parallel) along the conveyance direction A of the wet paper web W conveyed by the paper conveyance felts 100A and 100B.

  The fineness before splitting of each split fiber 15A in the papermaking felt 100 (100A; 100B) is 3.3 dtex or less, more preferably 1.9 dtex.

  A press device 300 of a shoe press type paper machine is a closed draw type press device.

As described above, according to the paper transporting felt 100, the wet paper web contact formed by dividing the plurality of divided fibers 15A into fine fibers and then impregnating the polymer elastic material 25 between the fine fibers. Since the fiber layer 15 is formed on the wet paper side surface of the first butt layer 13A of the paper transporting felt 100 so as to be in direct contact with the wet paper W, the surface smoothness of the wet paper contact fiber layer 15 is improved. This makes it possible to produce high quality paper with a smooth surface. Further, the surface of the wet paper web contact fiber layer 15 is a surface in which fine fibers formed by dividing the divided fibers 15A are partially covered with the polymer elastic material 25. Since there are some irregularities due to the protrusion of these fine fine fibers, the water film between the wet paper contact fiber layer 15 and the wet paper W is easily broken or difficult to form. Therefore, the wet paper web W can be easily passed to the dryer canvas of the next process.
In the case of the wet paper web contact fiber layer 15 having the mixed fibers of the divided fibers 15A and the non-divided fibers, the fine fiber is between the polymer elastic material 25 and the fine fibers (the divided fibers 15A are divided). And impregnated fibers and between the non-divided fibers. Further, the surface of the wet paper web contact fiber layer 15 that is in direct contact with the wet paper web W is partially covered with the fine fiber and the non-divided fiber by the polymer elastic material 25, and the surface of the wet paper web contact fiber layer 15 is covered. Since there are some irregularities due to the protrusions of these fine fine fibers and undivided fibers, the water film between the wet paper contact fiber layer and the wet paper W is easily broken or difficult to form. The paper can be easily removed from the paper 100, and the wet paper web W can be easily passed to the next dryer canvas.

  Further, the fine fibers formed by dividing the divided fibers 15A are bonded to a certain extent by the polymer elastic material 25 and partially covered, so that the so-called hair removal phenomenon hardly occurs and the falling off from the papermaking felt 100 is prevented. Is done. As a result, the paper manufactured by the shoe press type paper machine using the paper transporting felt 100 has an extremely smooth surface, and the life of the paper transporting felt 100 (ie, the usable period of the paper transporting felt 100). ) Is long, the frequency of maintenance for replacing the paper transport felt 100 with a new one can be reduced.

  Further, since the hydrophilic nonwoven fabric layer 23 is disposed between the first batt layer 13A and the wet paper contact fiber layer 15, the polymer elastic material 25 impregnated from the surface side of the wet paper contact fiber layer 15 is The wet nonwoven fabric layer 23 is not impregnated to the layers deeper than the hydrophilic nonwoven fabric layer 23 (that is, the first vat layer 13A, the base layer 11, and the second vat layer 13B). (For example, about 0.5 mm from the surface).

  Therefore, since the paper transporting felt 100 has water permeability and appropriate compression and recovery functions (cushioning properties), it can effectively exert water squeezing. In addition, dirt temporarily attached to the wet paper web contact fiber layer 15 including the polymer elastic material 25 (specifically, components such as additives and glue contained in the wet paper W) is suitable for the paper transport felt 100. Due to the compression and recovery function, the wet paper web contact fiber layer 15 is easily peeled off from the surface, and the wet paper web W is transferred. That is, the papermaking felt 100 has a high self-cleaning function. As a result, it is difficult for dirt to remain on the paper transporting felt 100, and the dirt transferred to the wet paper W is originally contained as a component in the wet paper W, and thus has an influence on the quality of the wet paper W. Nor. In addition, the hydrophilic nonwoven fabric layer 23 prevents retransfer (ie, a so-called rewetting phenomenon) of moisture once absorbed by the papermaking felt 100 from the wet paper W to the wet paper W.

  Further, according to the press device 300 of the shoe press type paper machine, the plurality of press mechanisms 51 and 53 having the paper transport felt 100 (100A; 100B) are transported by the paper transport felt 100 (100A; 100B). If they are arranged in series along the conveyance direction of the paper W, it is particularly suitable for efficiently squeezing water from the wet paper W and passing it to the next papermaking felt with good separation. That is, a large amount of water can be effectively squeezed out from the wet paper W containing a lot of water, and the wet paper W can be surely passed to the next paper making felt, enabling high speed papermaking operations. . In particular, a relatively large amount (within a range of 1 wt% to 10 wt%) of the polymer elastic material is disposed in the press mechanism 53 disposed on the downstream side in the conveyance direction of the wet paper web W among the plurality of press mechanisms 51 and 53. If the paper transporting felt 100B impregnated with 25 is disposed, the water permeability may be slightly reduced as compared with the paper transporting felt 100A in which the polymer elastic material 25 is less impregnated. Since it has not only a function but also high paper releasability, the wet paper web W transported at high speed can be surely passed to the dryer canvas in the next process, and high speed papermaking becomes possible.

  Moreover, the characteristics of the papermaking felt 100 can be changed by appropriately changing the blend ratio of the split fibers 15A and the non-split fibers in the wet paper contact fiber layer 15. Here, the weight ratio of the blended fiber is defined as “weight of split fiber 15A / (weight of split fiber 15A + weight of non-split fiber) × 100”. Surface smoothness and water squeezing, which are characteristics required for the paper transporting felt 100, have an inverse relationship, and if the density of the paper transporting felt 100 is increased in order to improve the smoothing performance of the wet paper surface, the water squeezing is poor. Tend to be. On the other hand, the plurality of press mechanisms 51 and 53 arranged from the upstream to the downstream in the conveyance direction of the wet paper W to be conveyed are required to have slightly different functions, and the paper making of the press mechanism 51 arranged on the upstream side is required. Water squeezing is important for the conveying felt 100A, and the papermaking felt 100B of the press mechanism 53 disposed on the downstream side is required to have a smoothing performance on the surface of the wet paper. Accordingly, by appropriately changing the blending ratio of the non-split fibers and the split fibers 15A, the paper transporting felt 100 has the optimum characteristics (surface smoothness, water squeezability, etc.) for the respective press mechanisms 51, 53. Is possible.

  Further, according to the paper transporting felt 100, the wet paper web contact fiber layer 15 includes 1% by weight to 10% by weight of the polymer elastic material 25, so that all pores between the fibers are filled with the polymer elastic material 25. And moderate pores are maintained between the fibers. In other words, it is a porous organization. Therefore, the water film formed between the wet paper web contact fiber layer 15 and the wet paper W is dispersed and has an appropriate cushioning property. Thereby, the paper separation from the paper transporting felt 100 is good, and the press mechanisms 51 and 53 absorb and absorb the water squeezed out of the wet paper W by expanding and contracting by the pressure of the rolls 57 and 61 and the shoes 55 and 59. In addition, the paper transporting felt 100 having a smooth surface can be obtained. Further, by changing the impregnation ratio of the polymer elastic material 25, it is possible to give the papermaking felt 100 the optimum characteristics (paper releasability, surface smoothness, water squeezing, etc.) for each of the press mechanisms 51, 53. it can.

  Further, according to the paper transporting felt 100, since the fineness before division of each of the divided fibers 15A is 3.3 dtex or less, even if the fineness before division of the divided fibers 15A is 3.3 dtex, the divided fibers 15A are divided. The fineness of the fine fiber formed by dividing the fiber 15A is smaller than 3.3 dtex. As described above, if the wet paper contact fiber layer 15 including the split fibers 15A that become fine fibers with a fineness close to that of the wet paper W is obtained by dividing, the wet paper web contact fiber layer 15 has a very high surface smoothness. Quality paper can be produced. Further, by impregnating the polymer elastic material 25 between such fine fibers, the surface of the wet paper web contact fiber layer 15 can be made smoother and a surface with good paper releasability. For example, even if a fine fiber that has fallen off or cut off from the wet paper contact fiber layer 15 due to a so-called hair removal phenomenon (that is, a fine fiber formed by dividing the divided fiber 15A) adheres to the surface of the wet paper W to some extent. Since the fibers are extremely thin, the quality of the wet paper web W is not deteriorated. Further, it is more preferable if the fineness before splitting of each split fiber 15A is a small value such as 1.9 dtex.

  The paper transporting felt 100 is obtained by dividing the divided fibers 15A of the wet paper contact fiber layer 15 into fine fibers and then impregnating the polymer elastic material 25 between the fine fibers. Is preferably performed in a needling process which is one of the processes for producing a paper transporting felt. If the divided fibers 15A are divided into fine fibers by carding at the previous stage in the needling process, a fiber lump (that is, a lump of fibers) is easily formed, and the fiber lump is implanted in the felt by needling, and the paper is conveyed. Since relatively large irregularities are formed on the surface of the felt, the surface smoothness of the wet paper is lowered. The splitting of the split fibers 15A may be performed, for example, by needling using a fine count needle in the needling process, or split with a brush of a raising machine (commonly known as a scissors) after the needling process. The fiber 15A may be rubbed, or the paper transporting felt 100 may be scoured (washed) after the needling step. That is, the splitting of the split fibers 15A may be performed in any process as long as it is after the carding that is the previous stage in the needling process and before the polymer elastic material 25 is impregnated. The polymer elastic material 25 is impregnated between the fine fibers after the divided fibers 15A are divided into fine fibers.

  The polymer elastic material 25 is impregnated by dividing the split fibers 15A into fine fibers, and then adding a synthetic resin such as a water-based urethane resin, water-based acrylic resin, water-based epoxy resin, water-based synthetic rubber (that is, water-based emulsion resin) at room temperature. It is carried out by applying with a roll or spraying with a spray and impregnating between fine fibers, and further heating and curing.

  Further, according to the press device 300 of the shoe press type paper machine, since it is a closed draw type press device, the wet paper web W is transported while being sandwiched between a pair of paper transport felts 100. As a result, the wet paper web W can be transported at an extremely high speed without applying a force to the wet paper web W that is weak and easily cut. Therefore, efficient papermaking becomes possible.

  Note that the present invention is not limited to the above-described embodiments and modifications, and modifications, improvements, and the like can be made as appropriate. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the embodiment and the modification described above are arbitrary and are not limited as long as the present invention can be achieved.

  For example, even if the paper transporting felt 100 is attached to a press device of an open draw type shoe press type paper machine having a portion where the wet paper W is transported independently during the transport, the same effect is obtained. Further, even when the paper transporting felt 100 is mounted on a press device of a closed draw type or open draw type roll press type paper machine, the above-described excellent effects and advantages of the present invention can be obtained.

It is a longitudinal cross-sectional view of an embodiment of a papermaking felt according to the present invention. It is an expanded sectional view of the split fiber which forms the wet paper contact fiber layer of the papermaking felt shown in FIG. It is a top view which shows schematic structure of one Embodiment of the press apparatus of the paper machine which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 (100A, 100B) Papermaking felt 300 Press apparatus of shoe press type paper machine 11 Base layer 13 Vat layer 13A First vat layer 13B Second vat layer 15 Wet paper contact fiber layer 15A Split fiber 23 Hydrophilic nonwoven layer 25 Polymer Elastic material 51 Press mechanism disposed upstream in the wet paper transport direction 53 Press mechanism disposed downstream in the wet paper transport direction 55 Shoe 57 Roll 59 Shoe 61 Roll A Wet paper transport direction W Wet paper

Claims (12)

It is arranged in a press device provided in the press part of the paper machine, forms a press mechanism together with the press in the press device, and is pressed by the press while sandwiching the wet paper, thereby squeezing out the wet paper At least one paper transporting felt of the pair of paper transporting felts that absorbs the water,
The base layer,
A first batt layer formed on the wet paper web surface of the base layer;
A second butt layer formed on the press side surface of the base layer;
A plurality of divided fibers divided into fine fibers and a polymer elastic material impregnated between the fine fibers, and the first and second fibers so that the fine fibers and the polymer elastic material are in direct contact with the wet paper. A wet paper contact fiber layer formed on the wet paper surface of the vat layer;
A hydrophilic non-woven fabric layer disposed between the first batt layer and the wet paper web contact fiber layer;
With
The paper transporting felt, wherein the fine fiber is partially coated with the polymer elastic material on a surface of the wet paper contact fiber layer that is in direct contact with the wet paper.   The papermaking felt according to claim 1, wherein the wet paper contact fiber layer contains 1% by weight to 10% by weight of the polymer elastic material.   The paper transporting felt according to claim 1 or 2, wherein the fibers forming the wet paper contact fiber layer are composed of 15% to 100% by weight of the split fibers and the remaining non-split fibers.   The papermaking felt according to any one of claims 1 to 3, wherein a fineness of each of the divided fibers before division is 3.3 dtex or less.   The papermaking felt according to claim 4, wherein the fineness of each of the split fibers before splitting is 1.9 dtex.   A press apparatus for a paper machine, comprising the paper transport felt according to any one of claims 1 to 5.   It is a press apparatus of the papermaking machine provided with two or more of the said press mechanisms which have the papermaking conveyance felt as described in any one of Claims 1-3, Comprising: The said several press mechanism is the said papermaking conveyance felt. A press apparatus for a paper machine, which is arranged in series along a conveyance direction of a wet paper web to be conveyed.   The press machine of the paper machine according to claim 7, wherein the fineness of each of the divided fibers before the division is 3.3 dtex or less.   The press machine of the paper machine according to claim 8, wherein the fineness of each of the divided fibers before division is 1.9 dtex.   The press device for a paper machine according to any one of claims 6 to 9, wherein the press device is a closed draw type press device.   11. The paper machine press device according to claim 6 is a shoe press type paper machine press device, wherein the press of the press device presses the paper transport felt and a shoe. A press device for a paper machine, wherein the press device is a shoe press.   The press device of the paper machine according to any one of claims 6 to 10 is a press device of a roll press type paper machine, wherein the press of the press device presses the paper transport felt. A press for a paper machine, characterized by being a roll press.

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