Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F7/00—Other details of machines for making continuous webs of paper
  • D21F7/08—Felts
  • D21F7/083—Multi-layer felts
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F7/00—Other details of machines for making continuous webs of paper
  • D21F7/08—Felts
  • D21F7/086—Substantially impermeable for transferring fibrous webs
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S162/00—Paper making and fiber liberation
  • Y10S162/90—Papermaking press felts
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3472—Woven fabric including an additional woven fabric layer
  • Y10T442/3504—Woven fabric layers comprise chemically different strand material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3707—Woven fabric including a nonwoven fabric layer other than paper
  • Y10T442/3724—Needled
  • Y10T442/3756—Nonwoven fabric layer comprises at least two chemically different fibers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3707—Woven fabric including a nonwoven fabric layer other than paper
  • Y10T442/3724—Needled
  • Y10T442/3764—Coated, impregnated, or autogenously bonded
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3707—Woven fabric including a nonwoven fabric layer other than paper
  • Y10T442/378—Coated, impregnated, or autogenously bonded
  • Y10T442/3813—Coating or impregnation contains synthetic polymeric material

Definitions

• the present invention relates to a wet paper web transfer belt used in a closed draw paper machine for carrying wet paper at high speed.
• a paper machine that removes moisture from paper raw materials includes a wire part, a press part, and a dryer part. These wire part, press part and dryer part are arranged in this order along the wet paper transport direction.
• wet paper is delivered by closed draw.
• wet paper is delivered by carrying wet paper on a wet paper carrying belt.
• the wet paper is conveyed while being sequentially delivered in the order of the wire part, press part and dryer part.
• the wet paper is transported by a wet paper web transfer belt and squeezed out (squeezed out) water by a press device, and then dried by a dryer part.
• the applicant of the present invention has a first function for attaching and transporting wet paper and a second function for smoothly removing the wet paper when passing the wet paper to the next process.
• the hydrophilic fiber strength exposed from the surface of the wet paper side layer and water from the wet paper are retained, the first function of attaching the wet paper to the wet paper web transfer belt and carrying it is exhibited. Also fiber Since a part of the body is exposed from the surface of the wet paper side layer, the second function of smoothly removing the wet paper when passing the wet paper to the next process is exhibited.
• Patent Document 1 JP 2004-277971 A
• the wet paper web transfer belt described in Japanese Patent Application Laid-Open No. 2004-277971 achieves both of the two functions.
• the hydrophilic fiber for example, rayon fiber
• the fiber body expands.
• the dimensions of the wet paper transport belt become unstable.
• the present invention has been made to solve such a problem, and the wet paper is provided between the first function of attaching the wet paper to the wet paper carrying belt and carrying it, and the next step.
• a hydrophilic fibrous body is formed by needle punching on the wet paper side layer of the wet paper web transfer belt.
• an object of the present invention is to provide a wet paper web transfer belt capable of suppressing the extension of the belt width dimension due to the water absorbing action of the hydrophilic fibrous body.
• the present invention includes a hydrophilic fiber body (for example, rayon fiber) in the wet paper web side layer of the wet paper web transfer belt, the width of the belt is determined by the water absorption action of the hydrophilic fiber body.
• a hydrophilic fiber body for example, rayon fiber
• the wet paper web transfer belt which is effective in the present invention, comprises a wet paper web side layer disposed on the wet paper web side including a hydrophilic fiber body, and a machine arranged on the press roll side. And a belt for transporting the wet paper used in a closed draw paper machine.
• the base fabric is configured by laminating a first woven fabric disposed on the wet paper web side and a second woven fabric disposed on the press roll side. At least a part of the hydrophilic fibrous body is exposed on the surface of the wet paper web side layer.
• the wefts of the first and second woven fabrics and / or the wefts of one or both of the woven fabrics have a low water absorption rate. It is a thread made of cocoon material.
• the weft of the woven fabric used in the present invention is preferably a yarn of a material selected from the group consisting of polyester, aromatic polyamide, aromatic polyester and polyether ketone.
• the basis weight of the first woven fabric is made smaller than the basis weight of the second woven fabric.
• the first woven fabric is a plain weave and the second woven fabric is a double weave.
• the first woven fabric may be a double weave, and the second woven fabric may be a triple weave.
• the first woven fabric may be a plain weave, and the second woven fabric may be a triple weave.
• the wet paper web transfer belt is formed by forming the hydrophilic fibrous body on the wet paper web side layer with a needle punch, and
• the function is a function of affixing the wet paper to the belt and transporting, and the second function is a function of smoothly removing the wet paper when delivering the wet paper to the next process. It is.
• the wet paper web side batt layer of the wet paper web side layer is composed of the hydrophilic fiber body, the wet paper web side batt layer has high water absorption, and the wet paper web side batt layer has high polymer elasticity. It is preferable that the body is impregnated.
• the polymer elastic body is a thermosetting resin selected from the group consisting of urethane, epoxy and acrylic, or a thermoplastic resin selected from the group consisting of polyamide, polyarylate and polyester.
• the hydrophilic fiber body is selected from the group of hydrophilic fibers consisting of nylon, vinylon, acetate, rayon, polynosic, cuvula, cotton, hemp, silk and wool.
• Rayon fiber or nylon fiber is used for the wet paper web side batt layer of the wet paper web side layer and the machine side batt layer of the machine side layer, and the hydrophilic fibrous body contained in the wet paper web side layer includes: It is preferable to use a material that has been subjected to chemical hydrophilic treatment on the surface of the fiber by means of mercerization processing, resin processing, sputtering by ionizing radiation or glow discharge processing.
• the official moisture content of the fibrous body used for the machine side batt layer of the machine side layer is: 4% or more lower than the official moisture content of the hydrophilic fibrous body of the wet paper web batt layer of the wet paper web layer.
• the fiber body used for the machine side batt layer is selected from a fiber group consisting of vinylidene, polyvinyl chloride, polyethylene, polypropylene, polyester, aromatic polyamide, polyurethane and acrylic.
• the wet paper web transfer belt which is effective in the present invention, is configured as described above, and is provided between the first function for attaching the wet paper web to the wet paper web feed belt and the next process.
• a hydrophilic fiber body is formed by needle punching on the wet paper web side layer of the wet paper web transfer belt. .
• the present invention can suppress the extension of the belt width dimension due to the water absorbing action of the hydrophilic hydrophilic body.
• FIG. 1 to FIG. 8 are diagrams for explaining the present invention.
• FIG. 1 is a schematic configuration diagram of a closed draw paper machine using the wet paper web transfer belt of the present invention.
• FIG. 2 is a cross-sectional view of a wet paper web transfer belt according to the first embodiment of the present invention.
• FIG. 3 is a cross-sectional view of a wet paper web transfer belt according to a second embodiment of the present invention.
• FIG. 4 is a cross-sectional view of a wet paper web transfer belt according to a third embodiment of the present invention.
• FIG. 5 is a plan view of a wet paper web transfer belt.
• FIG. 6 is a schematic configuration diagram of an experimental apparatus for evaluating the performance of a wet paper web transfer belt.
• FIG. 7 is a diagram showing a case where the wet paper web transfer belt of the present invention is manufactured by a needle machine.
• FIG. 8 is a diagram showing a case where the wet paper web transfer belt in Comparative Example 4 is manufactured by a needle machine.
• FIG. 1 is a schematic configuration diagram of a closed draw paper machine using a wet paper web transfer belt according to the present invention.
• a closed draw paper machine (hereinafter referred to as a paper machine) 2 that removes moisture from the paper raw material 2 includes a wire part (not shown), a press part 3, and a dryer part 4.
• wire part, press part 3 and dryer part 4 are Are arranged along the conveyance direction (arrow B direction) of the wet paper web W in the order of the steps.
• Wet paper W is conveyed while being passed to the wire part, press part 3 and dryer part 4 one after another.
• Wet paper W is squeezed in press part 3 and finally dried in dryer part 4.
• the wet paper web transfer belt 1 (hereinafter referred to as belt 1) is provided in the press part 3 of the paper machine 2 and is used to transport the wet paper web W in the direction of arrow B.
• the wet paper W is supported by the press felt 5, 6, belt 1 and dryer fabric 7, respectively, and is conveyed in the direction of arrow B.
• Each of these press felts 5, 6, belt 1 and dryer fabric 7 is an endless belt-like body and is supported by a guide roller 8.
• the shear 9 has a concave shape corresponding to the press roll 10.
• the shear 9 constitutes a press section 12 together with a press roll 10 through a shoulder press belt 11.
• the shear press mechanism 13 includes a press roll 10 and a shear 9 provided above (or below) the press roll 10. Shu press belt 11 force It is arranged between the press roll 10 and the shyu 9 and rotates.
• the press part 3 of the paper machine 2 is configured by arranging a plurality of shear press mechanisms 13 in series along the conveyance direction (arrow B direction) of the wet paper web W.
• the wet paper W is transferred from the wire part (not shown) to the press part 3 and then to the press felt 5 force and the press phenol 6.
• the wet paper web W is conveyed to the press section 12 of the press press mechanism 13 by the press felt 6.
• the wet paper W is pressed by the press 9 and the press roll 10 via the press press belt 11 while being sandwiched between the press felt 6 and the belt 1. As a result, the water in the wet paper W is squeezed out.
• the press felt 6 has a high water permeability and the belt 1 has a low water permeability. Therefore, the moisture in the wet paper W is transferred to the press felt 6 in the press section 12. The wet paper W is thus squeezed by the press part 3 and the surface is smoothed.
• the belt 1 Since the belt 1 has low water permeability, the belt 1 hardly retains moisture. Therefore, there is almost no rewetting phenomenon in which moisture is transferred from the belt 1 to the wet paper W, and the belt 1 contributes to the improvement of the smoothness of the wet paper W.
• the wet paper web W that has passed through the press section 12 is conveyed in the direction indicated by the arrow B by the belt 1. Then, the wet paper W is sucked by the suction roll 14, transported to the dryer part 4 by the dryer fabric 7, and dried.
• Benoleto 1 is required to have the first function of positively sticking the wet paper W immediately after escape from the press section 12 to the belt surface.
• the belt 1 has a second paper that smoothly separates the wet paper W from the belt 1 when the wet paper W is transferred to and from the next process (here, dryer part 4). Is also required.
• FIG. 2 is a cross-sectional view of the belt 1 that applies force to the first embodiment of the present invention.
• FIG. 3 is a sectional view of a wet paper web transfer belt la (hereinafter referred to as belt la) according to the second embodiment of the present invention, and corresponds to FIG.
• FIG. 4 is a sectional view of a wet paper web transfer belt lb (hereinafter referred to as belt lb), which corresponds to FIG. 2, according to the third embodiment of the present invention.
• FIG. 5 is a plan view of the belt 1, la, lb.
• belts 1, la, and lb have dimensions in a predetermined belt width direction (CMD direction), and run in the warp direction (MD direction) with the wet paper web W placed on the upper surface. It is supposed to do.
• the belt 1, la, lb includes a wet paper web side layer 31 including a hydrophilic fiber body 30 and disposed on the wet paper web W side, and a machine side layer 32 disposed on the press roll 10 side.
• Belts 1, la, and lb are provided with base fabrics 33, 33a, and 33b.
• the paper side layer 31 and the machine side layer 32 are arranged, respectively, and the belts 1, la, and lb are layered as a whole.
• the “hydrophilicity” in the hydrophilic fiber body 30 refers to the property of attracting moisture and / or the property of retaining moisture.
• the property of “hydrophilicity” is represented by “official moisture content” described in JIS L01 05 (General rules for physical testing of textile products).
• “exposed” means a state in which the hydrophilic fiber body 30 appears on the surface 37 of the wet paper web side layer 31, and the hydrophilic fiber body 30 is outside the surface 37 of the wet paper web side layer 31. It doesn't matter whether it protrudes or not.
• FIG. 5 shows an example of a state in which the hydrophilic fibrous body 30 is exposed on the surface 37 of the wet paper web side layer 31, but the present invention is not limited to this state.
• the weft yarn 36 of one or both of the first woven fabric 34 and the second woven fabric 35 is a yarn of a material having a low absorption rate.
• the belt 1, la, lb is formed by forming a hydrophilic fiber body 30 on the wet paper web side layer 31 of the belt 1, la, 1 b with a needle punch.
• the first function is a function of attaching the wet paper W to the belt 1, la, lb and transporting it.
• the second function is a function for smoothly removing the wet paper W when the wet paper W is delivered to and from the next step.
• the wet paper side batt layer 38 of the wet paper side layer 31 is constituted by the hydrophilic fibrous body 30. Therefore, the wet paper side batt layer 38 has high water absorption.
• the wet paper web batt layer 38 is impregnated with a polymer elastomer 39, and a part of the hydrophilic fiber body 30 is exposed on the surface 37 of the wet paper web layer 31.
• thermosetting resin such as urethane, epoxy, or acrylic
• thermoplastic resin such as polyamide, polyarylate, or polyester
• Benoleto 1, la, lb preferably has zero air permeability, but depending on the paper machine 2, it may be desirable that the belt 1, la, lb have some air permeability.
• the desired air permeability can be obtained by reducing the amount of impregnation of the polymer elastic body 39, polishing the surface 37 of the wet paper web side layer 31, or using a polymer elastic body containing open cells. Demonstrated.
• the wet paper side batt layer 38 constituting the wet paper side layer 31 and the machine side batt layer 40 constituting the machine side layer 32 are constituted by a staple fiber.
• the wet paper side bat layer 38 has its A hydrophilic fiber 30 is used as the staple fiber!
• As the staple fiber of the machine side batt layer 40 a fiber having a lower official moisture content than the hydrophilic fiber body 30 is used.
• the wet paper side batt layer 38 is intertwined and integrated with the wet paper side of the base fabrics 33, 33a, 33b by needle punching.
• the machine-side butt layer 40 is intertwined and integrated with the machine side (the press tool 10 side) of the base fabrics 33, 33a, 33b.
• the means for integrating the wet paper side batt layer 38 and the means for integrating the machine side batt layer 40 may be performed using an adhesive, electrostatic flocking or the like in addition to needle punching.
• the hydrophilic fiber body 30 preferably has an official moisture content of 4% or more.
• the hydrophilic fiber body 30 is made of nylon (official moisture content 4.5%), vinylon (5.0%), acetate (6.5%), rayon (11.0%), polynosic (11.0%) , Cupra (11.0%), cotton (8.5%), hemp (12.0%), silk (12.0%), wool (15.0%), and so on.
• the values in the force and the octopus are the official moisture content. If fibers with an official moisture content of less than 4.0% are used, the moisture from the wet paper W will not be sufficiently retained, so the first wet paper W is attached to the belt 1, la, lb and conveyed. I can't get the full functionality! / ⁇ .
• rayon fibers or nylon fibers are used for the wet paper side batt layer 38 and the machine side batt layer 40.
• hydrophilic fiber body 30 a fiber whose surface has been subjected to chemical hydrophilic treatment can also be used. Specific examples include mercerized processing, resin processing, sputtering by ionizing radiation, and glow discharge processing.
• the contact angle with water is 30 degrees or less under the condition that the moisture of the monofilament or spun yarn subjected to the hydrophilic treatment is adjusted to 30 to 50%. Can get good results.
• the percentage of water content of the monofilament or spun yarn is calculated by the formula of (water / total weight) ⁇ 100.
• the surface of the wet paper web batt layer 38 is polished with sandpaper or a grindstone.
• the hydrophilic fibrous body 30 is: It is desirable to have a strength of 0.8 g / dtex or higher.
• the belt 1, la, lb exhibits a second function of smoothly detaching the wet paper W when the wet paper W is passed to the next process.
• the fiber body 41 used in the machine side batt layer 40 is composed of fibers having a lower hydrophilicity than the hydrophilic fiber body 30 of the wet paper web side batt layer 38, that is, fibers having a low official moisture content. Specifically, it is preferable to select a fiber having a difference in official moisture content with respect to the hydrophilic fiber body 30 of 4% or more.
• the fiber body 41 includes biuridene having a low official moisture content (official moisture content 0%), polychlorinated bur (0%), polyethylene (0%), polypropylene (0%), polyester nore. (0.4%), aromatic polyamide (0.4%), polyurethane (1.0%), acrylic (2.0%), and the like.
• the basis weight of the wet paper web-side batt layer 38 constituting the wet paper web-side layer 31 is preferably suitable Yibin set in the range of 50 ⁇ 600g / m 2.
• the basis weight of the machine-side butt layer 40 constituting the machine-side layer 32 is preferably set as appropriate in the range of 0 to 600 g / m 2 ! /.
• the base fabrics 33, 33a, 33b are configured by laminating a first woven fabric 34 and a second woven fabric 35.
• the first woven fabric 34 and the second woven fabric 35 are woven fabrics obtained by weaving warps 42 in the MD direction and wefts 36 in the CMD direction.
• the weft 36 of one or both of the first woven fabric 34 and the second woven fabric 35 is made of polyester, aromatic polyamide, aromatic polyester, and polyether ketone having a low water absorption rate.
• a thread of a material selected from the group By doing so, the force S that suppresses the extension of the belt width dimension due to the water absorbing action of the hydrophilic fibrous body 30 constituting the wet paper web side batting layer 38 can be suppressed.
• the first woven fabric 34 and the second woven fabric 35 each have one of a plain weave, a double weave, and a triple weave as shown below. Also, the basis weight of the first woven fabric 34 The basis weight of the second woven fabric 35 is smaller.
• a needle machine is used to manufacture the belt 1, la, lb.
• the first woven fabric 34 and the second woven fabric 35 are laminated to form the base fabrics 33, 33a, 33b.
• needle punching is performed while the base fabrics 33, 33a, 33b having a laminated structure are run along the guide rolls of the needle machine.
• the upper cloth since the lower cloth (second woven cloth 35) is in contact with the guide roll, the upper cloth (first woven cloth 34) needs to be stretched in accordance with the elongation of the dimension of the lower cloth.
• the basis weight of the upper fabric (first woven fabric 34) is smaller than the basis weight of the lower fabric (second woven fabric 35). Becomes easier to stretch than the lower cloth. As a result, it is possible to force the upper and lower fabrics (the first woven fabric 34 and the second woven fabric 35) to match each other in the warp direction. In the present invention, such a so-called “take-up” can be performed, so that the base fabric 3 3, 33a, which has a good configuration with no displacement in the warp direction between the first woven fabric 34 and the second woven fabric 35. You can get 33b.
• the base fabric 33 one case for configuring the basis weight of the first woven fabric 34 to be smaller than the basis weight of the second woven fabric 35 is an upper fabric (first fabric).
• the woven fabric 34 may be a plain weave and the lower fabric (second woven fabric 35) may be a double-woven belt 1 (Fig. 2).
• the upper fabric (first woven fabric 34) may be a double-woven belt la and the lower fabric (second woven fabric 35) may be a triple-woven belt la (Fig. 3).
• the upper fabric (first woven fabric 34) may be a plain weave and the lower fabric (second woven fabric 35) may be a triple woven belt lb (Fig. 4).
• FIG. 6 is a schematic configuration diagram of an experimental apparatus 20 for evaluating the performance of the wet paper web transfer belt.
• the experimental apparatus 20 is composed of a pair of press rolls PR, PR forming the press part PP, a press felt PF sandwiched between the press rolls PR, PR, and a belt 1, la, lb.
• Press felt PF And belt 1, la, lb are fixed tension by multiple guide rollers GR It is supported while maintaining.
• the press felt PF and belt 1, la, lb are rotated according to the rotation of the press roll PR.
• the dryer fabric DF like the press felt PF, belt 1, la, lb, is constructed endlessly and runs while being supported by a guide roller.
• the wet paper web W is placed on the belts 1, la and lb located on the upstream side of the press part PP.
• the wet paper W is conveyed by the belt 1, la, lb, passes through the press part PP, and then reaches the succession roll SR. Then, the wet paper web W is delivered to the dryer fabric DF by suction of the succion ronole SR.
• Polyester especially polyethylene terephthalate (PET)
• Double weave / Triple weave See Fig. 3
• the upper fabric is 1/1 plain weave (warp yarn 42 is nylon multifilament twisted yarn and weft yarn 36 is PET single yarn) with a basis weight of 200g / m 2 .
• the lower fabric is a warp double weave structure (warp 42 is nylon monofilament twisted yarn and weft 36 is nylon monofilament twisted yarn) with a basis weight of 400g / m 2 .
• rayon fibers which are hydrophilic fiber bodies 30, were formed by needle punching at a basis weight of 600 / m 2 .
• the machine-side bat layer 40 was made of nylon fiber with a needle punch with a basis weight of 250 / m 2 .
• the wet paper web batt layer of the felt after needle punching formed as described above was impregnated with urethane resin at an impregnation amount of 500 g / m 2 .
• the upper fabric is a warp double weave structure (warp yarn is nylon monofilament twisted yarn and weft yarn is nylon single yarn) with a basis weight of 400 g / m 2 .
• the lower fabric (second woven fabric 35) is a warp triple weave structure (warp yarn is nylon monofilament twisted yarn and weft yarn is PET single yarn) with a basis weight of 600g / m 2 .
• the upper fabric is a 1/1 plain weave structure (warp yarn is nylon multifilament twisted yarn and weft yarn is PET single yarn) with a basis weight of 200g / m 2 .
• the lower fabric (second woven fabric 35) is a warp triple weave structure (warp yarn is nylon monofilament twisted yarn and weft yarn is PET single yarn) with a basis weight of 600g / m 2 .
• the upper fabric (wet paper side woven fabric) is 1/1 plain weave structure (warp yarn is nylon multifilament twisted yarn, weft yarn is nylon single yarn) and basis weight 200g / m 2 .
• the lower fabric (the woven fabric on the roll side) is a warp double weave structure (warp is nylon monofilament twisted yarn and weft is nylon monofilament twisted yarn) with a basis weight of 400 g / m 2 .
• upper fabric the wet paper side woven fabric
• triple weave structure the warp monofilament twine of nylon, weft monofilament twine of nylon
• the upper fabric (wet paper side woven fabric) is 1/1 plain weave structure (warp yarn is nylon multifilament twisted yarn, weft yarn is nylon single yarn) and basis weight 200g / m 2 .
• the lower fabric (the woven fabric on the roll side) is a warp double weave structure (warp is nylon monofilament twisted yarn and weft is nylon monofilament twisted yarn) with a basis weight of 400 g / m 2 .
• nylon fibers were formed by needle punching at a basis weight of 600 / m 2 .
• nylon fibers were formed with a basis weight of 250 / m 2 by needle punching.
• the extension of the belt width dimension in the wet paper web transfer belts according to Comparative Examples 1 to 3 is 0.5% to 2.5%.
• the belt width extension of the belts 1, la, and lb according to Examples 1 to 3 is 0.4 to 1.0% and is suppressed.
• the wet paper web transfer belt according to Comparative Example 3 has good dimensional stability in the width direction, but it has been found from this experiment that the function as the wet paper web transport belt is insufficient. In other words, the first function of attaching the wet paper W to the wet paper web transfer belt and the second function of smoothly removing the wet paper when transferring the wet paper between the next process are not available. It was enough. On the other hand, it was found from this experiment that the belts 1, la, and lb according to Examples 1 to 3 satisfactorily exhibited the first function and the second function described above.
• FIG. 7 shows a case where the belt 1 (or belt la, lb) of the present invention is manufactured by the needle machine 50.
• the basis weight of the first woven fabric 34 in contact with the wet paper web butt layer 38 is smaller than the basis weight of the second woven fabric 35! /, Showing the case! / .
• FIG. 8 is a diagram showing a case where the wet paper web transfer belt C in Comparative Example 4 is manufactured by the needle machine 50.
• FIG. 8 shows a case where the basis weight of the first woven fabric 34 is larger than the basis weight of the second woven fabric 35.
• the base fabric 33 of this laminated structure is made up of the base fabric 33a, 33b) along with a plurality of guide rolls G Rl, GR2, GR3 and a tension roller TR for adjusting the tension. Drive as shown in.
• the wet paper web batt layer 38 is supplied as shown by an arrow G and is superposed on the base fabric 33 (or the base fabrics 33a and 33b).
• the base fabric 33 having the laminated structure passes between the base fabrics 33a and 33b), the wet paper web-side butt layer 38, the force bed plate 51, and the needle board 52 overlaid thereon.
• the needle board 52 reciprocates as indicated by an arrow E, and the wet paper web bat layer 38 is needle punched by a large number of needles 53 installed on the needle board 52.
• the tension roll TR is rotationally driven in the direction of arrow R, and the belt travels in the direction indicated by arrow D. Therefore, the tension zone Z1 is generally from the front position P1 of the bed plate 51 to the tension ronor TR, and the slack zone Z2 is from the tension ronor TR to the front position P1 of the bed plate 51.
• the tensile modulus is larger as the basis weight is larger. Therefore, due to the tension caused by the tension roll TR, the first woven fabric 34 and the second woven fabric 35 are loosened in the zone Z2 due to a difference in modulus due to the difference in modulus. As a result, the woven fabric 34 or the woven fabric 35 is loosened by the difference in elongation.
• FIG. 7 schematically shows a state where the wet paper web-side bat layer 38 on the base fabric composed of the two woven fabrics 34, 35 laminated is needle punched by driving the needle board 52 up and down. It shows.
• FIG. 8 schematically shows a case where looseness occurs in the second woven fabric 35 having a small basis weight among the two woven fabrics 34 and 35 laminated.
• the slack of the second woven fabric 35 occurs so as to protrude inward in the area A2 near the guide roll GR1 and the guide roll GR2.
• the basis weight of the woven fabric 34 is smaller than the basis weight of the second woven fabric 35.
• the upper fabric (first weaving fabric 34 on the wet paper side) is a warp double weave structure (warp is nylon monofilament twisted yarn and weft is nylon monofilament twisted yarn) with a basis weight of 400 g / m 2 .
• the lower fabric (second woven fabric 35 on the roll side) is a 1/1 plain weave structure (the warp is nylon multifilament twisted yarn and the weft is PET single yarn) and has a basis weight of 200g / m 2 .
• rayon fibers which are hydrophilic fibers 30, were formed by needle punching at a basis weight of 600 g / m 2 .
• the wet paper web side layer with good surface smoothness could not be obtained, and the subsequent processes were stopped.
• the wet paper web transfer belt of the present invention can be applied to a belt for carrying wet paper by a press part constituting a closed draw paper machine.

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• 2007
  • 2007-01-20 JP JP2007010896A patent/JP5062815B2/ja not_active Expired - Fee Related
  • 2007-10-26 CN CN2007800400873A patent/CN101563502B/zh not_active Expired - Fee Related
  • 2007-10-26 EP EP20070830625 patent/EP2096206B1/en not_active Not-in-force
  • 2007-10-26 US US12/446,645 patent/US8147654B2/en not_active Expired - Fee Related
  • 2007-10-26 WO PCT/JP2007/070891 patent/WO2008053797A1/ja not_active Ceased

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