TW200532071A - Papermaking press felt and papermaking press apparatus - Google Patents

Abstract

A paper making press felt includes a plurality of base materials of an identical or a different type; and a fiber web layered on one or both faces of at least one of the base materials and integrally entwined therewith by needling. At least one of the base materials is a woven fabric including a machine direction (MD) yarn and a cross-machine direction (CD) yarn, such that one thereof is a twine made from a filament having a fineness of 50 to 250 dtex, and the other thereof is a single yarn having a fineness of 50 to 600 dtex.

Description

200532071 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a kind of felt made in papermaking machines (hereinafter referred to as "blanket" for short) and paper roll J. More specifically, this paper The invention relates to a paper-making blanket and a paper-pressing device which are pressed at the rolling section of the paper-making machine to squeeze out water from a wet paper web. [Prior art] A papermaking machine is provided with a paper rolling device ("rolling device" in the following examples). When it is rolled in the middle of a paper layer forming device, it is used to wet paper pulp (wet paper rolls) ) Dehydration. The wet paper roll system is squeezed out by applying a pressure there with the rolling device. For example, FIG. 4 shows a web portion of a conventional paper machine's rolling portion 7 0 0 by a paper layer forming device side. The wet paper roll transferred in 4 0 0) is introduced into the side of the rolling part through a picking drum 7 0 1, and is transferred to the first 1 1 roll by the felt 1 0 1. The first roll 1 P is a pair of felt rolls, through which the wet paper roll W is rolled on a first roll (groove drum) 7 0 3 by picking up the blanket and lowering the blanket 1 2. The roller 7 0 2 is rolled so that moisture passes through the nip of the felts 101 and 102 of the rollers 702 and 703 from the wet paper roll W, and then, the wet paper roll W is pressed by the suction roll 7 0 2 And transfer to a 2P to dewater by the rolling of a second rolling roller (groove roller) 7 0 4 and a middle 7 0 5. The wet paper roll W is further adhered to the surface of the middle 705 to thereby be transferred to a third roll 3P, and when 312XP / Invention Specification (Supplement) / 94-04 / 93138854 paper roll: device. The middle-pressed roller is the structure of the water in the press, W (wet paper is constructed by a pick-up as 101 and extruded with a suction. The two-roller press roller is the first 5 200532071 When the nip portion of the three-roller roller (groove roller) 7 06 and the center roller 705 are connected, the same third roller blanket 1 103 (P 3 roller blanket) is dewatered again. The wet paper roll W from which a large amount of moisture has been removed is further transferred to a fourth roll 4 P by a paper roll 7 0 8 and a fourth roll felt 104, so that a fourth roll roll (groove Drum) The nip between 7 0 7 and a 4 P upper drum 7 0 9 is dewatered, and the dewatering process is completed in the rolling section. Then, the wet paper roll W is transferred from the 4 P upper drum 7 0 9 To the subsequent drying process, which is equipped with a drying drum 7 10, etc. The basic functions of the papermaking roll blanket include extruding water from a wet paper roll (dehydration), and providing a smooth (smooth) surface of the wet paper roll, And forward the wet paper roll (wet paper roll transfer). In the function of the papermaking roll felt, squeezing water from a wet paper roll is performed When the wet paper roll passes between a pair of rollers, water is transferred to the felt by pressure, and the water in the felt is discharged from the back of the felt, or it is desired to pass one of the papermaking machines The felt system is sucked out of the felt system. According to this, the water permeability and the function of restoring the original shape when the pressure is released (flat durability) are necessary factors for the felt. Also, based on these factors The dewatering function needs to be maintained below the initial use stage. In addition, in the papermaking roll felt function, when the wet paper roll conveying function is implemented, the felt 1 1 is to be picked up from the net portion 4 0 0 through the suction. The roller 7 0 1 picks up the wet paper roll (wet pulp) to transfer it to the rolling part side, so it needs durable water permeability, and the surface smoothness is also important to ensure that the wet paper roll W sticks to the felt and avoids detachment. 6 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 Regarding the surface smoothing function (smoothing) of the papermaking roll felt for wet paper rolls, it needs to be raised behind the rolling part. Step 3 Papermaking in P or 4 P The surface of the rolled felt is smooth to reduce the difference between the wet paper roll W and the drum and the area in contact with the felt. Therefore, in each part of the felt, it is necessary to achieve good dehydration, tight recovery and smooth surface functions. Balance. Generally used paper-making roll felts are mostly batt-on-base type or bottom-net-press felt type, which are constructed of knitted fabrics, with Needle 1 e-punch method is used to fabricate a staple fiber batt web. Referring to FIG. 1, the structure of a conventional felt is described. A papermaking roll felt 10 is composed of a base material 20 composed of a woven fiber or the like and a textile fiber layer 30 integratedly wound around the base material 20 by needle rolling, and is formed into a loop. Shape (end 1 essshape). The base material 2 0 is used to ensure the mechanical strength of the felt 10, and a fiber having a woven with M D 2 22 and CD D 21 is used in FIG. 1. As mentioned before, felt 10 is used in the rolling section of paper machines, such as 101 to 104 (Figure 4). More specifically, the felt is placed on a plurality of guide rollers in the rolling section and a force is applied there. And a high pressure is applied to a blanket and a wet paper roll in a rolling part constructed by a pair of roll rollers or a roll roller and a sheath (sh oe) to remove water from the wet paper roll. Squeeze out. Here, the operation of the felt 10 corresponds to the rotation of the roller. [Summary of the invention] In recent years, because of the increase in the operating speed of papermaking machines and the efficiency of papermaking 7 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 and the increase in pressure in the rolling section, the environment in which blankets are used Getting worse. Accordingly, such an increase in the speed of the papermaking machine and an increase in the pressure of the rollers or sheaths in the rolls to improve productivity (which is the latest trend of the machine) will cause a disadvantage that the papermaking roll blankets will therefore be flattened and therefore Losing its water permeability and ability to recover tightly will significantly reduce its dehydration performance. Therefore, with regard to water permeability and durability in terms of dewatering performance, the ability to restore tightness, especially in the functions required for felts, is still a high efficiency for use in high-performance papermaking machines. As one of the objects to solve the above problems, various structures have been proposed. For example, it has been proposed that the proportion of the base material in the felt can be increased to flatten the felt. As one method of increasing the proportion of the base material, the patents JP-A-2003-13385 and JP-A-6-280183 are used to unfold a plurality of layers such as a double woven endless base fabric or a plurality of individual ends connected to each other A technique of fabricing a certain length of fabric at each end to construct a loop structure, stacking a textile fiber on top, and weaving the base fabric to weave the textile fiber layer by knitting the base integrally. At the same time, during the initial period of use in a papermaking machine, the felt is compacted and recovered to reduce thickness by sea. According to this, it can be seen that the textile fibers of the felt structure are easy to flatten. This is because the textile fibers (which are thinner than the base material) in the felt structure become thinner due to repeated compaction. Use 1 to 50 dtex textile fibers in an original felt, or preferably 3 to 30 dtex. Use textile fibers with a finer thickness than these values or have a 312XP / Invention Specification (Supplement) / 94-04 / 93138854 As the press section becomes high pressure, due to the prevention of 0 cases, it is said that the pile is connected to the material and the structure weight is reduced. The material is expected to be. In the case of a thinner 8 200532071 felt fiber layer, the flatness of the felt can be limited, but the surface smoothing performance of the wet paper roll (which is one of the main functions of the felt) is reduced. Here, a conventional technique for improving the surface smoothing performance of a wet paper roll has been known, for example, in Japanese Patent No. J P-A-2 0 3-1 3 3 8 5. This document discloses a felt structure including a non-woven fabric formed by arranging yarns substantially in parallel in a transverse direction and interposed between two or more fabric layers. The inserted non-woven fabric is used to mitigate the effect of the knit fabric or the joint portion of the MD yarn (up and down yarn at the intersection of the MD yarn and the CD yarn) on the surface smoothness of the wet paper roll. However, because the basis weight of the felt structure containing this non-woven fabric is relatively heavy, its dewatering performance and ease of installation will decrease. Also, the use of a flat yarn has been proposed for improving dewatering performance. U.S. Patent No. 5,6 5 1, 3 9 4 discloses an example in which a plied yarn made of a flat monofilament yarn is used to construct a knit fabric of a paper roll blanket, because The increase in the volume of the fabric can improve the ease of installation and dewatering performance in papermaking machines because it has less rigidity than a conventional braid (including a ply of an endless monofilament yarn). This document also describes that because the felt absorbs rolling vibrations, it reduces vibrations in the paper machine. However, the plied yarn made from the flat monofilament yarn has a large shape and is distorted to reduce the surface smoothing performance of the wet paper roll. The object of the present invention is to provide a papermaking roll felt, which has improved dewatering efficiency and imparts excellent surface smoothness to a wet paper roll, and in particular, a papermaking roll felt suitable for high-speed operation, which can provide a smooth surface of the wet paper roll. , 9 312XP / Invention Specification (Supplement) / 94-04 / 9313 8854 200532071 and a paper-making roll pressing device having such a felt. In particular, the object of the present invention is to provide the above-mentioned problems by providing a papermaking roll and a rolling device, which provide improved dewatering performance (durability of water seepage vertical flattening and surface smoothing performance against wet paper rolls). When studying the blanket structure suitable for the above purpose, the inventor of this case can use the bottom material constructed by two layers (A and B) or multiple layers, and at least one base material B is a combination of plied yarn and single A sound system has a special slenderness), so that when weaving the fabric, the plied line is transformed into a flat string. Therefore, the present invention provides a papermaking roll felt, which includes a plurality of or different kinds of base materials; and a fiber web, which is stacked on one or both sides of the material and knitted to be integrally wound therewith; one of the base materials is a Woven fabric consisting of machine direction or cross-section machine direction (CD) yarns, such that one of them is a plied yarn made of fine threads of 50 to 2 50 dte X fineness, and the other has 5 0 to 6 0 0 dte X single yarn of fineness. Preferably, the papermaking roll felt described above includes a knitted fabric, which is a closed end, preferably a patternless (p 1 ai η) knitted fabric, which is entangled to form a plurality of fabric layers, such that The gap of the aligned strands is filled by the flattening effect of the strands, thereby improving the surface smoothing performance and resistance to flattening of the paper roll. Preferably, a multi-knit composed of a double knit or a thicker structure is used as the base knit, so that the 312XP / invention specification (supplement) / 94-04 / 93138854 of the multi-knit is made of a woven fabric. ), To find the basis of the structure > thread (which is woven into the same base material at least (MD) yarn from a system with a winding space for multiple times to the wet system by the pair 10 200532071 The gap between the Qi strands is filled by the flattening effect of the strands. In addition, in order to assist the transformation of the strands into a flat string (c 0rd), it can be given by 30 to 30 meters per meter. 100 final twists, and the ratio of the initial twist to the final twist is 1.2 to 1.4 to effectively form a loose twisted twisted strand. In addition, in order to easily shorten the The void can effectively apply a dissolvable fine yarn, such as MD yarn or CD yarn, by inserting a textile fiber thereon by needle punching, and then disassembling the single yarn to remove it, further promoting shortening Gaps between such strands. Ming also provides a papermaking roll pressing device in which the above papermaking roll felt is used as at least one of the papermaking roll felts. Especially, a closed draw type papermaking roll device, It is designed to fix the wet paper roll between two felts for dehydration. Because of high-speed feeding and high pressure, it is applied to a harsh condition, so the wet paper roll needs better flattening resistance and surface smoothing ability. However, because the papermaking roll felt according to the present invention can withstand such harsh conditions and maintain its excellent dewatering ability to provide paper with excellent surface smoothness, the present invention is particularly suitable for a closed-pulling type papermaking roll device. The invented papermaking roll felt uses a thicker yarn with a finer thickness than textile fibers, such as MD yarn or CD yarn. When woven in a fabric, it can easily become a flat thin thread, so it can be easily reduced in size. The gap between the plied yarns in the braid, and as a result, the paper-making rolling device with such a blanket provides a wet paper roll with an excellent surface smoothing ability and Resistance to flattening. 11 312XP / Invention Specification (Supplement) / 94 · 04/9313 8854 200532071 In particular, when the felt is applied to a paper rolling device (it fixes a wet paper roll between two felts for dehydration) In this case, it can improve the surface smoothing ability and the resistance to flattening. [Embodiment] According to a specific example of the present invention, since the fabric of the base material (B) is composed of the above-mentioned plied yarn and braid, The plied yarn contains a pile and thereby the joint portion of the braid becomes a flat surface, and in addition, the flat shape can promote the reduction of the space therebetween, thereby improving the smoothness of the surface despite having a textile fiber layer. In addition, since the thread (its system becomes flat) is thicker than the textile fiber, the felt can be limited. Preferably, the MD yarn or the CD yarn is a plied yarn formed by a twisted fineness of 50 to fi 1 ament, preferably 2000 dte X 〇 The thickness of the plied yarn is not specially specified, J decides, however, that a fineness of 500 to 300 dte X is a plied line. In order to further ensure this specific example (that is, the plied yarn becomes one due to weaving the fabric with a fine plied yarn and a single yarn, it is effective to give 30 to 100 revolutions per meter and initially twist The ratio to the final twist is in the range of 1. to effectively form a loose twisted twisted strand. Using this loose twisted twist is helpful to reduce the gaps between the twisted strands that make up the braid, because the twisted strands can easily become flat when fabrics are used Thin rope. Here, in the initial twist or final twist, the twisting system is Super312XP / Invention Specification (Supplement) / 94-04 / 93138854, which is designed to supply wet paper to a protruding single yarn! Flat shape, twisted line One of the reductions is the flatness of the overall joint • 2 50 0 dte X 100 (usually using a specific flat string) with a final twist of 2 to 1 · 4, the twisted strand is when weaving over 12 meters per meter 2005 2005 071 1 0 In the example of 0 times, the plied yarn becomes a tightly twisted plied yarn, which is not suitable for achieving the advantage that the plied yarn can be transformed into a flat string when weaving into a fabric. When the ratio of the initial twist to the final twist ranges from 1.2 to 1.4, when weaving into a fabric, the plied yarn can not only be easily transformed into a flat string, but also obtain a stable structure without collision or looseness. Take off. In examples where the ratio of the initial twist to the final twist exceeds 1.2 to 1.4, the plied yarn causes deformation and ends in the braid and is thus restricted from becoming flat. In addition, the preferable M D yarn or CD yarn is a single yarn with a fineness of 50 to 600 d t e X, and more preferably 100 to 4 0 d t e x. Using such a single yarn as the braided yarn system allows reducing the area occupied by the joints in the braid. This also leads to an improvement in the surface smoothing performance of the wet paper roll. According to a specific example of the present invention, a blanket is provided, in which the space between the strands can be effectively reduced in a woven fabric, thereby improving the surface smoothing performance and resistance to flattening of the wet paper roll. . A variety of methods can be used to help reduce the gap between the strands, one of which is to use a braid with a closed end, preferably a patternless braid, and wind the braid multiple times to A plurality of fabric layers are formed so that the gaps between the aligned strands are filled by the flattening effect of the strands. This knitted fabric has an enhanced advantage that the strands in an upper fabric layer can be easily flattened, which is filled in the space between the strands in the lower fabric layer, and furthermore in the lower fabric layer itself The strands are also easily flattened to reduce the gap between the strands. Also, in another specific example that intends to reduce the gap between the strands, 13 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 A multi-knit system consisting of a double knit or thicker structure Is used as the base braid so that the gaps between the aligned strands constituting the multi-braid are filled by the flattening effect of the strands, which further promotes the reduction of the gaps between the strands of the braid, As in the example of the above braid. In addition, when weaving into a fabric, it is used to further promote the ply into a flat string and fill the gaps between the aligned plies by the flattening effect, which effectively reduces the MD yarn and CD in the weave. The number of yarn intertwined points. For this purpose, the single yarn used as the MD yarn or the CD yarn may be a dissolvable fine yarn, more specifically a water-soluble fine yarn. The use of a knitted fabric composed of such yarns, by implanting a textile fiber thereon by needle needling, and then dissolving the single yarn to remove it, further promotes the voids between the strands. The material for dissolving the fine yarn includes polyvinyl alcohol, acrylic acid, polyester, and the like, and among them, water-soluble polyethylene glycol is preferably used. In addition to the example of using the dissolvable fine thread, nylon, polyester, etc. can be used as the material of the plied yarn and single yarn of the fabric to be woven, of which nylon is particularly suitable (because of its excellent strength and durability). Referring to FIG. 2, a specific example of the present invention is described. Initially, a papermaking roll blanket 100 according to the present invention includes a base material 2000 and a textile fiber layer 300. The textile fiber layer 300 is formed by integrally winding the textile fiber and the base material 2000 with a needle punch. The base material 2 0 includes two kinds of base materials, namely, a base material A (2 1 0) and a base material B (2 2 0). 2 10 is used to ensure the mechanical strength of the blanket 100, but this is not a limitation. Various materials can be used to construct the same object, as long as the 14 312XP / Invention Specification (Supplement) / 94-04 / 9313 8854 200532071 The material can provide a sufficient strength. For example, a knitted fabric knitted with M D yarn 2 1 2 and CD yarn 2 1 1 may be used. Although two different types of base materials 2 10 and 2 2 0 are stacked in FIG. 2, a similar material may be used as long as the base material B 2 2 0 can meet the requirements of the present invention. The base material 2 10 may be a knitted fabric composed of MD yarns and CD yarns, wherein the MD yarns and the CD yarns have a width smaller than the width of the blanket to be manufactured, and are spirally wound around their adjacent edge portions to Connected to each other. In addition, a knitted fabric composed of MD yarns and CD yarns having substantially the same width as the width of the blanket to be manufactured may be coaxially wound to construct the base material. Furthermore, in addition to a base material composed of a knitted fabric, a base material in which the MD yarn system is fixed with an adhesive or in which the MD yarn and the CD yarn system are stacked only without being knitted may also be used. According to the present invention, another base material B 2 2 0 is stacked on the base material A 2 1 0 to construct the entire base material 2 0 0. The base material 2 2 0 is a knitted fabric composed of a machine direction yarn (M D yarn) 2 2 2 and a cross section machine direction yarn (C D yarn) 2 2 1, which is a feature of the present invention. That is, one of the MD yarns or CD yarns in the braid is a plied yarn made of 50 to 250 dte X fineness, and the other is 50 to 60 0 dte X fine Single yarn. The present invention also provides a paper-making rolling device in which the above-mentioned felt is installed. Except for the papermaking machine shown in FIG. 4, the felt of the present invention can be applied to any kind of papermaking machine. However, when the felt is used in a closed pull papermaking roller device (designed with an upper felt and a lower felt) In the case where the wet paper roll W is fixed from both sides for transportation and rolling), the advantages of the blanket of the present invention can be achieved more effectively 15 312XP / Invention Specification (Supplement) / 94-04 / 9313 8854 200532071. As shown in FIG. 5, the closed-pulling type rolling device is configured to fix the wet paper roll W between the upper felt 101 and the lower felt 102 to be transported and rolled to withstand the high-speed supply of the wet paper roll. efficacy. Therefore, the wet paper roll is guaranteed to be stably maintained at a high speed and stably between the felts or the felts during the entire stroke in the rolling section. The paper-making rolling device 8 0 0 shown in FIG. 5 represents a structure in which two rolling devices, namely the first rolling device 8 1 0 and the second rolling device 8 2 0 located on the downstream side, are along the wet paper. The supply and delivery direction of the roll W is continuously installed, and the first rolling device 810 has a first roller 811 and a first sheath rolling portion 812. The second rolling device 820 has a second roller 821 and a second sheathed rolling portion 8 2 2. In the first rolling device 8 1 0, a sheath rolling device is generally used, which applies a higher pressure than a conventional papermaking machine. However, because of picking up (P cik-up) felt 101 and bottom felt The 102 series is easy to be flattened and loses the dewatering ability. Therefore, the use of the felt of the present invention results in a significant improvement in dewatering performance. Similarly, in the example of the second rolling device 8 2 0, since the wet paper roll W is fixed between the upper felt 105 and the lower felt 106 for transportation and rolling, it is desirable to use the felt of the present invention to As the upper felt 105 and the lower felt 106, to further ensure the durability of the dewatering performance and the surface smoothness of the wet paper roll W. In addition, although FIG. 6 shows a paper rolling device constructed by continuously installing two sheath rolling devices, one rolling device can also be used to replace one of the protection 16 312XP / Invention Specification (Supplement) / 94-04 / 9313 8854 200532071 Set of rolling device, or omit it. However, in any of these examples, the use of the felt of the present invention can achieve superior performance in dewatering, surface smoothing, and the like. (Specific Examples) Hereinafter, the present invention will be described in more detail based on several specific examples. In all specific examples, another base material B (2 2 0, 2 3 0, 2 4 0, 2 5 0), which individually represents a feature of the present invention, is stacked on the base material A (2 1 0) to construct the entire Base material 2 0 0. In all common examples, the base material A 2 10 is constructed as follows. Structure of the base material 2 10: (1) M D yarn and CD yarn are specified as the plied yarn as the MD yarn and the CD yarn. (2) Twisting conditions: "2/2/2 2 0" (these values correspond to "the number of initial twisted thin wires of the final twist / the number of single thin wires of the initial twist / the fineness of the single thin wire = dte X ") (3) Initial torsion: S-torsion, 250 times per meter (4) Final torsion: Z-torsion, 160 times per meter The initial and final torsion exceeds 150 per meter Secondly, the ply yarn is thus defined as a tightly twisted ply. (5) Twist rate (initial / final): 1. 5 6 (6) Knitting: MD yarn: 1 2 0 rows / 5 cm, CD yarn: 40 rows / 5 cm 3/1 1/3 loop double knitting (Specific Example 1) 17 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 As shown in FIG. 2, the following braids 2 2 0 are stacked as the base material A (2 1 0) on the base material Β manufactures a blanket by constructing a base material 2000, and further forms a textile fiber layer 3 00 (11 dte X, 600 g / m2). The structure of the knitted fabric 2 2 0. (1) M D yarn: use the ply yarn specified below. (a) Torsion condition: "2/2/2 2 0" (b) Initial twist: S-twist, 4 times per meter (c) Final twist: Z-twist, 30 times per meter (d) Twist rate (initial / final): 1 · 4 0 (2) CD yarn: single yarn (fineness 3 3 0 dte X) (3) weaving: MD yarn: 40 rows / 5 cm, CD yarn: 3 4 Column / 5 cm 3/1 non-patterned ring-shaped single knit (specific example 2) A blanket having a structure similar to that of specific example 1 was manufactured, except that the following knitted fabric 2 3 0 was used as the base material B instead of the knitted fabric 2 2 0 . In other words, the system stacks 2 3 0 to replace 2 2 0 in FIG. 2. The structure of the knitted fabric 2 3 0. (1) M D yarn, CD yarn: the same as the specific example 1. (2) Weaving: M D yarn: 40 rows / 5 cm, CD yarn: 34 rows / 5 cm 3/1 single pattern without knitting, one end is closed, and two windings are performed to construct the stacked knitted fabric 230. (Specific Example 3) 18 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 Manufacture a blanket with a structure similar to that of Specific Example 2 except that the knitted fabric 2 4 0 (where the MD yarn and the CD yarn are mutually interchanged ) As the base material B to replace the knitted fabric 2 3 0. In other words, the system stacks 2 4 0 to replace 2 2 0 ° in FIG. 2 (specific example 4). The base material 200 is stacked on the base material 210 by stacking the knitted fabric 2 5 0 as the base material B. 220) in FIG. 2, in which a water-soluble P VA single yarn is used as the CD yarn. Next, the textile fiber is integratedly wound around the base material 200 by needle punching to manufacture a paper-rolled felt 100. Then, in the subsequent process, the CD yarn system is dissolved and refined by hot water, so that only one MD yarn The layer 2 50 remains on the base material 2 1 0. Structure of knitted fabric 2 50: (1) M D yarn: same as knitted fabric 2 2 0 (specific example 1). (2) CD yarn ································································································· 2 1 0 is a knitted fabric 2 6 0 constructed on the base material 2 1 0, in which the textile fibers 3 0 0 are stacked thereon as shown in the specific example to make a blanket. The textile fiber is implanted into the knitted fabric prepared according to the above specific examples 1 to 4 and comparative example 1 by needling, and the needling felt is refined in hot water and dried with hot air to complete Paper roll felt. Table 1 shows the structure of the base material B in each specific example. (Table 1) 19 312XP / Invention Specification (Supplement) / 94-04 / 9313 8854 200532071

Yarn CD single-of

Single ring without pattern 600g / m

The specific strand of the present invention Comparative Example 210 The PV strand of this strand

The clear yarn is dissolved in a single document, and the end is the same. The same, the same, the same, and the same conventional plied yarn. The double-knitted yarn of the present invention is the same. All the blankets are the same number of these paper-rolled felts. , Paper, resistance has been obtained by the following steps, (1) paper smoothness is obtained according to the distribution value of the surface distance of the papermaking roll felt. Surface roughness). The higher the value, the better the slip. (2) The compaction recovery and the flattened blanket are pressed. As shown in Figure 6, it is the compression of the j-rolling roller that was not rolled at the beginning and after; the rate is calculated by the following formula, and the compaction rate = X recovery Rate (%) = (t2_tl) (where t 0 is the textile fiber (basic weight: g / m 2) that is initially placed, and the smoothness of the sheet, the compaction recovery, and the flattening are obtained. The surface is not flat A reciprocal value between a wave crest and a wave trough 'according to JISB 0 6 and 1 9 8 2 (Table' represents the smaller the distance distribution, and therefore the resistance of this flat is not an experimental device, and the thickness of the blanket is in a pleasant state Measured by a sensor, and after the pressure is released to release the enemy, the compaction rate and recovery are used to obtain the compaction recovery and the longevity. 100 / ti X 100 Blanket Thickness & 312XP / Invention Instruction (Supplement) / 94-04 / 93138854 20 200532071 tl: Thickness of felt after compression t 2 ·· Thickness when pressure is released at the moment) The experimental device is equipped with a pair of rollers PR, PR for supporting the The felt is provided with a plurality of guide rollers GR, which apply a specific tension to them, and is used for measuring after being compressed by the rollers. A blanket thickness sensor (not shown), and a second sensor (not shown) for measuring the thickness of the blanket when pressure is released from the pressure. The experimental device is operated to generate A pressure of 100 kg / cm and a blanket driving speed of 1000 m / min, and the experiment lasted 120 hours. According to the values of the compaction rate and the recovery rate obtained by the above measurement, the resistance to flattening All the estimates of the properties are implemented for the examples and comparative examples, and the relevant points of the results are shown below. Here, the value of the specific example 1 is defined as 3 points, which is used as a reference value, so that The higher points in other specific examples are considered good and the lower points are considered poor. The higher the point, the better the efficiency can be achieved. (3) The estimation of the durability of water permeability ( Water Permeability Coefficient One of the experimental devices shown in Figure 7 was implemented to apply a load of 30 kg to the blanket (which has been immersed in water for one hour) and measured 30 litres of water from the front of the blanket Time taken to the next. This measurement is not affected The above samples of compaction recovery and estimation of resistance to flattening, as well as samples after 120 hours of testing, are performed, and the variation of water permeability (water permeability coefficient) is based on individual measurements using the following formula Good results to estimate the durability of water permeability. The higher the coefficient, the lower the durability of water permeability. 21 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 Water permeability coefficient (%) = (Water passing time of tested samples) / (Water passing time of untested samples) X 1 0 0 For the blankets manufactured according to these specific examples and comparative specific examples, the measured physical properties are as shown in the table 2 shown. (Table 2) Evaluation paper smoothness index-resistance to flattening water permeability coefficient compaction rate recovery rate total evaluation of resistance to flattening Specific example 1 0.012 34% 28% 3 137% Specific example 2 0.015 37% 31 ° / 〇5 121% Specific example 3 0.014 37% 31% 5 119% Specific example 4 0.020 35% 30% 4 123% Comparative specific example 0.007 32% 26% 2 152% As a result, all the papermaking roll felts of the specific examples (the knitting fabric having the stack, the knitting fabric is composed of MD yarns and CD yarns, and one of the MD yarns or the CD yarns is according to the present invention) A plied yarn made of a fine thread having a fineness of 50 to 2 50 dte X, and the other is a single yarn having a fineness of 50 to 6 0 dte X) can be used in the paper smoothness index and Good resistance to compaction is achieved, while the blanket according to this comparative example (which has the same plied yarn as the base material of the MD yarn and the CD yarn 2 1 0) is in the paper smoothness index and the The compaction resistance shows a poor performance. In addition, regarding the blanket of Specific Example 4, the water-soluble single yarn system is used as the CD yarn, because the CD yarn system is dissolved at the interlacing point of the MD yarn and the CD yarn and is no longer located in the knit, so The felt can achieve an excellent surface smoothness. Based on this result, the blankets according to the specific examples 2 and 3 are effectively used as pick-up blankets for a papermaking machine because they have excellent water permeability 22 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 Different from flattening and durability. In contrast, for the later stages (3 P, 4 P), the surface smoothness is particularly necessary, and the blanket according to the specific example 4 is effective to achieve an excellent result in terms of the paper smoothness index. (Industrial Applicability) A specific example of the present invention is to provide a felt which has an excellent surface smoothing ability and resistance to flattening to a wet paper roll system. In the case where such a felt is used as a papermaking roll felt, the surface of a wet paper roll can be maintained because it has excellent compaction and recovery rates for the pressure applied by a roller or a sheath during papermaking. The smoothing ability limits the flatness of the felt, and as a result, the excellent dewatering characteristics can be maintained for a long time. Further, the use of a dissolvable fine yarn as a machine direction (M D) yarn or a cross section machine direction (CD) yarn constituting a knitted fabric can produce a paper having excellent surface smoothness. The felts of the specific examples can be used in different types of papermaking machines. However, in the case where the felts are used in a closed pull-type papermaking roll device, the flattening of the wet paper roll can be sufficiently achieved despite the high-speed operation. Advantages of resistance and surface smoothing performance. In addition, such a rolling device applies a higher pressure than a conventional papermaking machine because the felt is easily flattened and thus loses the dewatering ability. However, the felt having excellent resistance to flattening can be maintained using the present invention. High efficiency dehydration performance. In addition, the reduction in smoothness due to the loss of direct contact between the wet paper roll and the surface of the cylinder is also overcome by using a felt according to a specific example of the present invention. Therefore, because the blanket of the present invention provides various advantages, the blanket can be suitably used as a high-performance blanket and used in today's evil 23 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 poor operating conditions (such as High speed and high pressure). [Brief description of the drawings] The present invention can be described in more detail with reference to the accompanying drawings, wherein: FIG. 1 is a schematic cross-sectional view showing a conventional general-purpose paper roll felt. Fig. 2 is a schematic cross-sectional view showing the papermaking roll felt according to the specific examples 1 to 4 of the present invention. Fig. 3 is a schematic cross-sectional view showing a papermaking roll felt according to Comparative Example 1 of the present invention. Fig. 4 is a schematic view showing a rolling device of a papermaking machine. Fig. 5 is a schematic view showing a rolling device of a papermaking machine in which a rolling felt according to the present invention is installed. Figure 6 shows a device for measuring the compaction recovery efficiency and resistance to flattening of a felt. FIG. 7 shows a device for measuring the water permeability coefficient of the felt. [Description of Symbols of Main Components] 10 Paper Rolling Blanket 20 Base Material 2 1 CD Yarn 22 MD Yarn 3 0 Textile Fiber Layer 1 00 Paper Rolling Blanket 101 Blanket 1 02 Blanket 24

312XP / Inventory (Supplement) / 94-04 / 93138854 200532071 1 03 Blanket 1 04 Blanket 10 5 Blanket 10 6 Blanket 2 0 0 Base material 2 10 Base material 21 1 CD Yarn 21 2 MD Yarn 2 2 0 Base material 22 1 Machine direction yarn (CD yarn) 2 2 2 Machine direction yarn (MD yarn) 2 6 0 Knitted fabric 3 0 0 Textile fiber layer 4 0 0 Mesh section 7 0 0 Roller section 70 1 Picking roller 7 0 2 Suction Roller roller 7 0 3 First roller roller 7 0 4 Second roller roller 7 0 5 Center roller 7 0 6 Third roller roller 7 0 7 Fourth roller roller 7 0 8 Paper roller 7 0 9 Upper roller 25

312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071

7 10 Drying roller 800 Paper-making rolling device 81 0 First rolling device 8 11 First roller 8 12 First sheath rolling section 820 Second rolling device 821 Second drum 822 Second sheath rolling section W Wet paper Roll PR Roller Roller GR Guide Roller 1 P First Roller 2P Second Roller 3P Third Roller 4P Fourth Roller 312XP / Invention Manual (Supplement) / 94-04 / 93138854 26

Claims (1)

200532071 10. Scope of patent application: 1. A paper-making roll felt, comprising: a plurality of base materials of the same or different kinds; and a fiber web stacked on one or both sides of at least one base material and integrated with it by knitting Winding; wherein, at least one base material is a knitted fabric including a machine direction (MD) yarn and a cross section machine direction (CD) yarn, so that one of them is a thin thread having a fineness of 50 to 2 50 dte X The resulting plied yarn, and the other is a single yarn with a fineness of 50 to 600 dte X. 2. For example, the papermaking roll blanket of the scope of application for patent, wherein the knitted fabric has a closed end, and the knitted fabric is wound multiple times to form a plurality of fabric layers, so that the aligned ply threads The interstices are filled by the flattening effect of the strands. 3. For example, the papermaking roll felt of item 2 of the patent application scope, wherein the knitted fabric is an unpatterned knitted fabric. 4. For example, the papermaking roll felt of the scope of the patent application, wherein the knitted fabric is a multi-woven fabric including double knitting or a thick structure, and the gap between the aligned plied lines forming the multi-woven fabric is obtained by This flat line is filled with the flattening effect. 5. For example, the papermaking roll felt according to item 1 of the patent application scope, wherein the plied yarn is a loosely twisted plied yarn having a final twist of 30 to 100 times per meter and the initial twist is relative to the The final twist ratio ranges from 1.2 to 1.4. 27 312XP / Invention Specification (Supplement) / 94-04 / 93138854 200532071 6. For example, the papermaking press felt in the scope of patent application No. 1, in which the machine direction (MD) yarn or section machine direction (CD) constituting the knitted fabric The yarns are all soluble thin threads. 7. A paper-making rolling device, comprising: a rolling section including a paper-making rolling felt; wherein the paper-making rolling felt includes: a plurality of base materials of the same or different kinds, and a fiber web stacked on at least One or both sides of a base material are integrally wound with knitting; and at least one base material is a knitted fabric including a machine direction (MD) yarn and a cross section machine direction (CD) yarn, so that one of them is A plied yarn made of a fine yarn having a fineness of 50 to 250 dte X, and the other is a single yarn having a fineness of 50 to 600 dte X. 8. A papermaking press device, comprising: two pieces of papermaking roll felt, which are fixed with a wet paper roll between them to dewater the wet paper roll; wherein at least one papermaking roll felt includes: a plurality of the same Or different kinds of base materials, and a fiber web stacked on one or both sides of at least one base material and integrated with it by knitting; and at least one base material is a machine including a machine direction (MD) yarn and a section machine Orientation (CD) yarn woven so that one of them is a plied yarn made of fine threads with a fineness of 50 to 2 50 dte X and the other is a 50 to 6 0 0 dte X Single yarn of fineness. 28 312XP / Invention Specification (Supplement) / 94-04 / 93] 38854 200532071 9. For the papermaking roll pressing device under the scope of patent application No. 8, which further includes: a first roll pressing device, which is fixed with two pieces of blanket The wet paper roll is dewatered; and a second rolling device is installed on the downstream side of the first rolling device; wherein one of the first rolling devices picks up a felt and a lower felt and the second rolling device At least one of the upper felt and the lower felt includes one of the papermaking roll felts. 10. The papermaking rolling device according to item 8 of the patent application scope, further comprising: a first rolling device, which fixes a wet paper roll with two felts to dewater it; and a second rolling device Is installed on the downstream side of the first rolling device; wherein one of the first rolling device picks up the felt and the lower felt and one of the second rolling device includes the papermaking roll One of the blankets. 1 1. The paper-making rolling device according to item 8 of the patent application scope, further comprising: a first rolling device, which is fixed with two felts to wet a paper roll to dewater it; wherein the paper-rolling felts One of them is installed in the first rolling device. 29 312X]) / Invention Specification (Supplement) / 94-04 / 93138S54