JPH02293487A - Multi-layer woven fabric for paper making - Google Patents

Abstract

PURPOSE:To improve wear resistance, stability, surface smoothness, filtering properties and wire mark properties of multi-layer woven fabric by superimposing separately heat-set woven fabrics and interlacing the piled woven fabrics. CONSTITUTION:Heat-set endless lower layer woven fabric 5 having a traveling face wherein the under surface of crimp of the weft 7 is laid lower than the under surface of the warp 6 and the warp is embedded in the crimp of the weft is inserted into inner space of heat-set endless upper layer woven fabric 2 having paper making surface wherein the top of warp 3 and the top of crimp of weft 4 are in the same plane. Both the woven fabrics are bonded and integrated by adhesion, fusing, sewing, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multilayer fabric used in paper manufacturing. [Prior Art] There are more demands than ever for paper manufacturing products. Broadly speaking, they can be divided into (a) problems related to paper quality itself, such as preventing the occurrence of wire marks and sufficient entanglement of paper fibers, or problems with paper manufacturing yield; (b) improving abrasion resistance, extending the service life of textiles; (c) Problems with good r aqueous properties, etc. Each problem is related to each other in many ways, but roughly speaking, problem (a) is mainly related to the ellipse of the paper-making surface of the A product, and the ``mouth'' is a problem related to the ellipse of the paper-making surface of the fabric. Closely related to Kozue-kari, (c) is a problem related to textiles as a whole. In the past, many proposals have been made to solve ``A''. However, sufficient efforts have not been made to address the problem of "opening", that is, improving the abrasion resistance of papermaking fabrics, and the running side of papermaking fabrics is connected to the weft r! As a J-wear type, the warp threads are only able to prevent wear and tear.

However, in recent years, various conditions have been required such as increasing paper manufacturing speed, increasing the amount of filler used, and increasing the need to manufacture neutral paper, and the abrasion resistance of paper manufacturing fabrics has become a major issue. In terms of stability of the posture of the fabric during use and extension of its service life, it is desirable for endless fabrics, including papermaking fabrics, to have a wear-resistant effect on the weft yarns on the running surface. This is because when the warp threads are worn out, the dimensions of the fabric change, and when the warp threads are worn out, the fabric itself is directly cut, which shortens the usable life of warp worn fabrics. In order to improve such abrasion resistance, attempts have been made to use abrasion-resistant polyamide yarn for the weft yarn, but this attempt does not change the conventional wisdom itself, but simply No ground-breaking effects were obtained because the properties of the materials used were simply utilized, and on the other hand, papermaking fabrics using polyamide yarns had the disadvantage of poor posture stability. Therefore, in the past, polyester yarns with excellent rigidity were used for both the warp and weft to construct papermaking fabrics that were difficult to stretch and had excellent posture stability. In addition, in order to meet the above-mentioned requirements in conventional paper making materials such as these, attempts have been made to use threads with a thicker diameter as the weft threads on the running side of the m material for lick making. Although the abrasion resistance has been improved to some extent, the thick weft threads disrupt the balance between the weft and warp threads, impairing crimp performance and causing wire marks, which poses too many practical problems. ．． Furthermore, as can be understood from the problem (c) above, if the ellipse of the fabric changes, the water resistance will also be affected, and the problem cannot be solved by simply making the weft thicker. Also,. In recent years, in order to solve the above problems, warp yarns with a small diameter,
The weft is used to form a dense papermaking surface layer, while the warp and weft with large wire diameters are used to form a running surface layer with high #twi properties, and the warp and weft that form both sides are shared. A multi-layered fabric is used, and a multi-layer 11lli fabric is used, in which yarns different from the warp and weft that form the paper-making surface layer and the running surface layer are woven and the two layers are connected. However, in such a multilayer fabric, the heat absorption amount and shrinkage force in the weft direction of the lower running surface layer are smaller than the heat absorption WJR and shrinkage force in the weft direction of the upper layer, so the fabric is The upper part of the fabric tends to shrink in the width direction, resulting in so-called selvedge curling in which both ends of the fabric in the width direction lift upward. The fabric in this state not only has a shortened service life due to abrasion of the edges during use, but also has the problem of unstable contact between the guide berm and the fabric, making it impossible to control running. Furthermore, the difference in length in the middle direction caused by the difference in the amount of shrinkage in the width direction appears after heat setting, so the width of the lower layer fabric becomes wider than the width of the upper layer fabric during use. Wavy wrinkles occur in the width direction of the fabric 9 Paper-making fabrics that have wavy wrinkles in the width direction of the lower layer not only cause abnormal wear on the running surface of the lower layer during use, but also affect the paper-making surface. This causes many problems such as causing marks on the paper. For this reason, at present, heat setting is not done sufficiently to prevent a difference in the amount of shrinkage in the middle direction between the upper and lower layers, but fabrics that have suppressed shrinkage in the middle direction in this way are Because it contains internal stress during contraction, problems such as shrinkage and muscle bending occur during use. Furthermore, due to the force of the spun yarn that binds both the upper and lower layers, the bound part of the upper layer fabric is drawn into the lower layer fabric, causing many problems such as unevenness on the paper surface and wire marks on the paper. [Problems to be Solved by the Invention] The present inventor found that the problems of the conventional technology as described above are caused by heat-setting both the upper and lower layers of an endless fabric at the same time and under the same conditions. Separately! & By polymerizing and bonding woven fabrics that have been sufficiently heat-set under appropriate conditions, we can improve traction resistance, posture stability, and surface smoothness, and also improve P water resistance and wire, which are problems specific to papermaking fabrics. It also improves paper making performance such as markability. [Means for Solving the Problems] The present invention has the following features: 1. A paper-making surface where the upper surface of the warp, which has been woven with warp and weft and has undergone heat-setting processing, and the upper surface of the crimp of the weft formed between the warp are on the same plane. In the inner space of the endless upper layer fabric having warp and weft, the lower surface of the weft crimp that protrudes downward between the warp yarns is below the lower surface of the warp yarn, which has been woven with warp yarns and weft yarns and has undergone heat-setting treatment. A separately finished paper-making surface fabric in which an endless lower layer fabric forming a buried running surface is inserted to bring the lower surface of the upper layer material into close contact with the upper surface of the lower layer fabric, and the two are fixed and integrated. 2. A multilayer fabric for papermaking, comprising an upper layer fabric and a running surface fabric. 2. A multilayer fabric for papermaking as claimed in claim 1, wherein the upper layer fabric and the lower layer fabric are integrated by fixing the selvedges of the overlapping fabrics. 3. Bring the lower surface of the upper layer fabric into close contact with the upper surface of the lower layer fabric,
The multilayer fabric for paper making according to claim 1, wherein both surfaces are fixed and integrated. 4. 4. A multilayer paper manufacturing product according to claim 1, wherein the upper layer fabric and the lower layer fabric are bonded by adhesive or welded. 5. The multilayer fabric for papermaking according to any one of claims 1 to 3, wherein the upper layer fabric and the lower layer fabric are fixed by stitching with a binding thread. 6. The multilayer fabric for papermaking according to any one of claims 5 to 5, wherein the upper layer fabric and the lower layer fabric are fixed by a combination of stitching with a binding thread and adhesion with an adhesive. 7. The paper manufacturing method according to any one of claims 1 to 6, wherein the upper layer fabric and the lower layer fabric, which are heat-set and overlapped, have the same length in the weft direction, and the lower layer fabric has no slack in the weft direction. Multilayer fabric, 8. The upper layer A is sufficiently heat-set while maintaining tension in the warp direction so that the upper surface of the warp and the upper surface of the weft crimp formed between the warps are on the same plane during the heat-setting process, while the lower NJllt material teeth,
In the heat setting process, the weft is sufficiently bent and the lower surface of the crimp of the weft that protrudes downward between the warp is lower than the lower surface of the warp, and the warp is sufficiently heat fixed while maintaining the tension in the warp direction. A method for producing a multilayer woven fabric for papermaking, characterized by combining woven fabrics that have been embedded in a crimp and have been heat-set in advance. Regarding ``. In the present invention, an upper layer fabric with a paper-making surface formed on the upper surface and a lower layer fabric with a running surface formed on the lower surface are separated! X! Build. By pressing each fabric separately in this way, the optimal wire material to be used can be freely selected and the desired heat setting can be achieved. That is, the upper layer fabric has a paper-making surface in which the upper surface of the warp and the upper surface of the weft crimp formed between the warp yarns are on the same plane, and the lower layer fabric has a paper-making surface where the upper surface of the warp yarn and the upper surface of the weft crimp formed between the warp yarns are on the same plane. is below the lower surface of the warp threads, forming a running surface where the warp threads are buried in the crimps of the weft threads. Such an upper layer fabric is sufficiently heat-set while maintaining tension in the warp direction so that the upper surface of the warp and the upper surface of the crimp of the weft formed between the warps are on the same plane during the heat-setting treatment, and, on the other hand,
In the lower layer fabric, the weft yarns are sufficiently bent during the heat setting process.
The lower surface of the weft crimp that protrudes downward between the warp threads is below the lower surface of the warp thread, and the warp threads are fully heat-set while maintaining warp direction tension in a state where the warp threads are buried in the weft crimp. Both m's have already been heat-set. The widths of the upper and lower endless fabrics obtained in this way are made the same and the two are overlapped. An endless lower layer fabric is inserted into the hollow part of the endless upper layer fabric, and the lower surface of the upper layer fabric and the upper surface of the lower layer fabric are brought into close contact with each other, and the two are fixed and integrated to form a multilayer fabric for paper making. To fix and integrate the two, use adhesive to bond the overlapped edges or desired parts of the fabric, touch them using hot melt adhesive, or use binding thread. They are integrated by suturing, etc., but these methods may of course be used in combination. [Function] As described above, in the present invention, an upper layer fabric having a paper-making surface formed on its upper surface and a lower layer fabric having a running surface formed on its lower surface are manufactured separately. By manufacturing each woven fabric separately in this way, it is possible to freely select the optimal wire rod to be used, and it is possible to achieve the desired degree of fixation. In other words, in the running surface fabric, the weft is sufficiently bent to form a protruding weft crimp between the warp yarns, and the weft crimp is sufficiently heat-set, so that the weft crimp becomes rectangular in cross section and three-dimensionally cylindrical, resulting in a significantly large wear-resistant volume. ．． In addition, the lower surface of the weft crimp is below the lower surface of the warp, forming a running surface where the warp is buried in the weft crimp, completely preventing wear of the warp. On the other hand, paper-making surface fibers are made by adjusting the bending of the weft threads and heat-setting them to form a paper-making surface in which the upper surface of the warp threads and the upper surface of the crimp of the weft threads formed between the warp threads are on the same plane. The paper becomes extremely smooth, improving the quality of the paper and preventing marks from forming. In this way, since the upper and lower layers of fabric, each of which has been heat-set and have the same medium size, are stacked on top of each other, there is no occurrence of selvage curl due to the difference in shrinkage amount and shrinkage force caused by conventional simultaneous heat-setting. The present invention also exhibits superior effects in terms of manufacturing compared to multiple weaves. The drawings will be explained in detail later, but in multi-layer weaving, when weaving the upper paper-making surface, the upper layer warp threads are opened vertically and a shuttle is driven between them. The lower warp threads are placed below the open upper warp threads, and when weaving the paper-making surface of the lower layer, the lower warp threads are opened upward and downward, and a shuttle is driven between them. The upper warp threads are placed above the open lower warp threads. The shuttle runs while sliding on the warp threads, but because the number and arrangement of the warp threads that come into contact with the bottom of the shuttle are different, there is a large difference in the running speed of the shuttle. In a normal AM, the operation signals for each device are obtained from one revolution of the main rotating shaft of the loom, so if there is a difference in the speed of the shuttle, the speed of the shuttle and other devices will be affected. There are frequent cases where the shuttle cannot grasp the weft accurately or cannot pass the grasped weft to other devices. As a result, fluctuations in the weft density of the fabric occur due to a decrease in the am operation rate and a stoppage of the I1ak machine due to malfunction. However, in the present invention, the fabric forming the paper-making surface and the fabric forming the running surface are woven separately, and the fabric is not multi-woven, so such defects do not occur. Next, when implementing the present invention, t&i %J t! - List and explain in detail. [Example] Fig. 1 is a perspective view showing a partial cross section of the multilayer fabric for paper manufacturing of the present invention. Reference numeral 1 indicates a multilayer A product for paper manufacturing consisting of upper and lower layers, an upper layer fabric 2 and a lower layer fabric 5. 3 is the warp of the upper layer fabric, and 4 is the weft of the upper layer fabric. 6 is the warp of the lower layer A, and 7 is the weft of the lower layer M. The upper and lower fabrics are stacked to form the multilayer papermaking fabric of the present invention. In this embodiment, the overlapping edges of the upper fabric 2 and the lower fabric 5 are fixed and integrated using a hot melt adhesive, and 8 is the fixed part. FIG. 1 is an embodiment of the present invention, and is a longitudinal sectional view of a multilayer fabric for paper making of the present invention. It is understood that the lower layer fabric 5 is disposed in close contact with the lower layer of the upper layer fabric 2. Figures 3 and 4 show m in conventional multiple weaving.
This is a cross-sectional view during weaving. Figure 3 is a cross-sectional view when weaving the upper layer fabric, and 9 is the warp of the upper layer fabric, and 10 is the warp of the lower layer fabric. Also,
FIG. 4 is a cross-sectional view when weaving the lower layer fabric, where 9 is the warp of the upper layer fabric and 10 is the warp of the lower layer fabric. As can be seen from this figure, in multi-layer weaving, when weaving the upper layer paper-making surface, the upper layer warp threads are opened vertically and a shuttle is driven between them. The lower warp threads are placed on the lower side, along with the lower threads of the open upper warp thread. On the other hand, when weaving the running surface of the lower layer, the warp threads of the lower layer are opened at the top and bottom, and a shuttle is driven between them. At this time, the upper layer warp threads are arranged on the upper side alongside the upper threads of the open lower layer warp threads. The shuttle runs while sliding on the warp threads arranged on the lower side, but because the number and arrangement of the warp threads that come into contact with the bottom of the shuttle during weaving of the upper layer fabric and the lower layer fabric are different, there is a large difference in the running speed of the shuttle. There is a difference. Normal tat1! ! Since signals for the operation of each device are obtained from one revolution of the mIi's main rotation axis, if there is a difference in the speed of the shuttle, the cooperation between the shuttle and other devices will be hindered, and the line will not be able to grasp the weft accurately. It often happens that the gripped weft cannot be passed to other devices. Therefore,
The weft density of the fabric changes due to a decrease in the operating rate of the loom and a malfunction that causes the loom to stop. Papermaking fabrics require uniform and accurate #Ilm in order to produce paper of good quality, so fluctuations in the weft density of fabrics have been a serious problem. However, in the present invention, the fabric forming the paper-making surface and the fabric forming the running surface are woven separately, and it is understood that such defects do not occur because multiple weaving is not performed. Next, the effects of the present invention will be explained with reference to a comparative test between the papermaking fabric of the present invention and a conventional papermaking multilayer fabric using multiple weaving. Multilayer fabric sample 1 for papermaking of the present invention Upper layer fabric An endless fabric was woven using polyester monofilaments with a line i of 10.17- for the warp and polyester monofilaments with a wire diameter of 0.17 m for the weft, and was then heat-set and exposed. A fabric with the yarn density shown in 1 was obtained. The lower layer fabric warp has a wire diameter of 0. Using 25am polyester monofilament, 1 polyester monofilament with a wire diameter of 0.301II1 and 1 polyamide monofilament were used for the weft.
Endless fabrics woven at a ratio of 1:1 were heat-set to obtain product A with the thread density shown in Table 1. Multilayer Fabric The above upper layer fabric was superimposed on the lower layer fabric and the edges were adhered with a hot melt adhesive to obtain an endless multilayer fabric for paper making of the present invention having a diameter of 1,300 am and a length of 8,000 am. Conventional example 1 The upper warp has a wire diameter of 0. Using a 17m polyester monofilament, the upper weft is a polyester monofilament with a wire diameter of 0.17mm, and the lower warp is a polyester monofilament with a wire diameter of 0.17mm. 25rm
using polyester monofilament with a wire diameter of 0.5 mm for the lower weft. A multi-woven endless fabric woven by arranging 30 m of polyester monofilament and polyamide monofilament at a ratio of 1:1 was heat-set to obtain a papermaking fabric with a width of 1 300 m + length of 8000 ll II and a thread density shown in Table 1. ．． Conventional Example 2 A polyester monofilament with a wire diameter of 0.17B is used for the upper warp, a polyester monofilament with a wire diameter of 0.17 mm is used for the upper weft, a polyester monofilament with a wire diameter of 0.25 mm + is used for the lower warp, and a wire diameter of 0.17B is used for the lower weft. 0
．． Made of 30am+ polyester monofilament!
And mIJ! Table 1 shows the results of heat-setting the multilayered endless fabric.
Table 1 shows the test results of a papermaking fabric with a width of 1300 m and a length of 8000 B with the thread density shown in Table 1. Table 1 Sample 1 Conventional Example 1 Upper layer fabric warp density (piece/hand) 70 Weft density (piece/piece) 70 Lower layer fabric warp density (piece/piece) 35 Weft density (piece/piece) 35 Sheet smoothness ( seconds) Amount of curl at the edge (1) O Amount of bending (1) Amount of medium shrinkage (■) Life number ratio 10G Conventional example 2 4G [Note] 1. Sheet smoothness: The raw material pulp containing medium quality paper was With a test machine, the basis weight was 70 g/nf.
A paper sheet of equivalent size was made into a smooth sheet according to a conventional method, and the smoothness of the paper surface that was in contact with the fabric surface was measured using a Beck smoothness meter. 2. Running surface abrasion resistant volume 2. A value calculated by calculating the volume of warp and weft from the cross section of the fabric until the warp cross section on the running surface side reaches 50%.3. Ear curl amount = v & The object was made into an endless shape, stretched between two rolls at a force of 12 kg/am, and the height change from the horizontal part of the fabric to the end of the fabric edge when wet with water was measured. ．． 4. [Effects] The multilayer fabric for paper manufacturing of the present invention has no curling at the edges, no curling, and no shrinkage in width, as described above. Since the amount of paper is extremely small, it has excellent stability in posture during use, and not only has a long service life, but also has the excellent effect of improving paper quality because the sheet smoothness is good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a partial cross section of the multilayer fabric for paper manufacturing of the present invention. FIG. 2 is a longitudinal cross-sectional view of the multilayer paper-making fabric of the present invention. Figures 3 and 4 show the warp arrangement during weaving of a conventional multilayer fabric for paper manufacturing. It is a cross-sectional view showing the relationship between the vehicle and the shuttle. 1... Multilayer fabric for paper making of the present invention 2... Upper layer fabric 3... Upper layer warp 4... Upper layer weft 5... Lower layer fabric 6... Lower layer warp 7... Lower layer weft 8...・Fixed part 9...Upper layer warp 10 during weaving...Lower layer warp 11 during weaving...Shuttle

Claims (1)

[Scope of Claims] 1. An endless upper layer fabric woven with warp and weft yarns and heat-fixed, having a paper-making surface in which the upper surface of the warp yarns and the upper surface of the crimp of the weft yarns formed between the warp yarns are on the same plane. In the internal space, the warp and weft have been woven together and the heat-setting process has been completed, and the lower surface of the crimp of the weft that protrudes downward between the warp is lower than the lower surface of the warp, and the running surface where the warp is buried in the crimp of the weft. The formed endless lower layer fabric is inserted and the lower surface of the upper layer fabric and the upper surface of the lower layer fabric are brought into close contact with each other, and the two are fixed and integrated, and the paper-making surface fabric and the running surface fabric are finished separately. Multilayer fabric for paper making. 2. The multilayer fabric for paper making according to claim 1, wherein the upper layer fabric and the lower layer fabric are integrated by fixing the edges of the overlapping fabrics. 3. The lower surface of the upper layer fabric and the upper surface of the lower layer fabric are brought into close contact with each other, and the entirety of both surfaces are fixed and integrated.
Multilayer fabric for paper making. 4. The multilayer fabric for paper making according to any one of claims 1 to 3, wherein the upper layer fabric and the lower layer fabric are bonded by adhesive or welding. 5. The method according to any one of claims 1 to 3, wherein the upper layer fabric and the lower layer fabric are fixed by stitching with a binding thread.
Multilayer fabric for paper making. 6. The multilayer fabric for papermaking according to any one of claims 1 to 5, wherein the upper layer fabric and the lower layer fabric are fixed by a combination of stitching with a binding thread and bonding with an adhesive. 7. The method according to any one of claims 1 to 6, wherein the length of the upper layer fabric and the lower layer fabric that have been heat-set and overlapped is the same in the weft direction, and there is no slack in the weft direction of the lower layer fabric. Multilayer fabric for paper making. 8. In the heat setting process, the upper layer fabric is sufficiently heat set while maintaining tension in the warp direction so that the upper surface of the warp and the upper surface of the weft crimp formed between the warps are on the same plane. In this process, the weft is sufficiently bent during the heat setting process, and the warp is sufficiently heat set while maintaining tension in the warp direction so that the lower surface of the crimp of the weft that protrudes downward between the warp is lower than the lower surface of the warp. A method for producing a multilayer woven fabric for papermaking, characterized by combining a woven fabric that has been heat-set in advance and embedded in a weft crimp.