JP6718731B2 - Felt base fabric for papermaking and method for producing felt base fabric for papermaking - Google Patents

Description

The present disclosure relates to a felt base fabric for papermaking and a method for manufacturing a felt base fabric for papermaking.

Papermaking felts are used in the press part of a paper machine to carry wet paper that is squeezed. The felt includes a base cloth in which warp threads and weft threads are woven together, and a batt fiber layer formed by needling a short fiber sheet on the base cloth. As for the base cloth, a small width base cloth 1 having a width smaller than the product width is prepared as shown in FIG. 7 in addition to the method of weaving a woven fabric corresponding to the length and width of the product (FIG. 7(A)). , The narrow width base cloth 1 is spirally wound and the adjacent widthwise end portions are joined (Fig. 7(B)), and the width of the spirally wound narrow width base cloth reaches the product width. Then, a method is known in which both end portions having a step are cut parallel to the machine direction to obtain the paper-making felt base fabric 2 (FIG. 7(D)). For example, Patent Document 1 describes that such a paper-making felt base cloth and a paper-making felt base cloth spirally wound in the opposite direction are overlapped to form a multi-layered base cloth. ..

Japanese Patent Publication No. 6-503385

In general, the felt for papermaking is manufactured individually according to the purpose and the paper machine to which the felt is applied, and thus the size of the base fabric is different for each felt manufactured. Therefore, the base cloth is manufactured after receiving the order.However, when manufacturing the base cloth using the narrow width base cloth, the small width base cloth is manufactured in advance and the small width base cloth is manufactured. Since the base cloth having a desired size can be manufactured by spirally winding and joining, there is an advantage that delivery time can be shortened. On the other hand, the narrow width base cloth has a problem that the widthwise end portion is easily frayed. In particular, when a thick monofilament was arranged in the weft, the fraying of the end portion in the width direction was remarkable. Therefore, when the narrow width base cloth is spirally wound, the widthwise end portions adjacent to each other cannot be joined, or even if they can be joined, sufficient strength cannot be obtained at the joint portion, so that the base cloth is not formed in the subsequent step. There was a risk that the joint portion would be torn or uneven at the joint portion during handling.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a felt base fabric for papermaking having a joint portion of a narrow base fabric having sufficient strength, and a method for producing the same.

A papermaking felt (12) according to at least some embodiments of the present invention comprises a narrow width base cloth (11) spirally wound in a machine direction such that widthwise ends thereof are joined to each other. An endless paper-making felt base fabric, wherein the narrow base fabric is a warp yarn (13) extending in the length direction, a weft yarn (14) woven into the warp yarn and extending in the width direction, and the width. and a tangled yarn woven in leno weave so as to extend in the length direction to the end direction (16) (15), more than 50% of the weft, Ri Do from single twisting, at least the weft One is characterized by being composed of a monofilament .

According to this configuration, the entangled yarn is caught on the irregularities on the surface of the single-twisted yarn, and the weft yarn made of the single-twisted yarn woven into the warp is bent due to the high flexibility of the single-twisted yarn, and the entangled yarn is entangled in the bent single-twisted yarn. Since the entanglement yarn is caught, the entangled yarn is less likely to slip in the width direction, the fray of the narrow width base fabric is suppressed, and the felt base fabric for papermaking can be provided in which the joint portion has sufficient strength.

In at least some embodiments of the present invention, in the above configuration, the single-twisted yarn is a yarn obtained by twisting three monofilaments, and the number of twists of the single-twisted yarn is 19 to 32 times per 10 cm. Characterize.

According to this configuration, the flexibility and compression resistance of the single-twisted yarn are balanced, and the fray can be suppressed without impairing the compression resistance of the narrow width base cloth.

In at least some embodiments of the present invention, in the above configuration, the warp has a circular cross-sectional shape with a diameter of 0.35 to 0.45 mm, and each of the monofilaments constituting the single twist yarn has a diameter of Has a circular cross-sectional shape of 0.18 to 0.30 mm, and the entangled yarn has a circular cross-sectional shape of 0.15 to 0.25 mm in diameter, or has a long side of 0.20 to 0.40 mm. There is a rectangular cross-sectional shape having a short side of 0.10 to 0.25 mm.

If the thickness of the entwined yarn is set in this configuration with respect to the thickness of the warp yarn and the single-twisted yarn that constitutes the weft yarn, the yarn breakage during weaving can be prevented and the entangled yarn can be made into paper. It is possible to prevent the mark from being added.

At least some embodiments of the present invention are characterized in that, in the above structure, the entangled weave is formed by weaving the two entangled yarns together.

According to this structure, the entanglement yarns for preventing the fray can be independently formed with respect to the warp yarns forming the basic design of the narrow base fabric, so that the weaving management becomes easy.

Further, at least some other embodiments of the present invention are characterized in that, in the above configuration, the entangled weave is formed by weaving one of the entangled yarns into one of the warp yarns.

According to this configuration, the warp yarns and the entangled yarns at the end portions in the width direction are integrally woven, so that it is possible to prevent the strength of the end portions in the width direction of the narrow base fabric from being lowered.

At least some embodiments of the present invention are characterized in that, in the above configuration, the entangled weave is provided in two rows at each of both ends in the width direction.

According to this structure, it is possible to more reliably prevent fraying of the widthwise end portion of the narrow base cloth. The entangled woven fabric may be provided in three or more rows at each of both ends in the width direction, but since the effect of preventing fraying is not different from the case of providing two rows, the case of providing two rows is effective in preventing fraying. The best balance with suppression of increase in manufacturing labor.

At least some embodiments of the present invention are characterized in that, in the above configuration, the entangled yarn is a fluorescent yarn.

According to this configuration, the visibility of the end portion in the width direction of the small width base fabric is enhanced, so that it is possible to prevent the joining portion from being displaced when the end portion in the width direction of the narrow width base fabric is joined.

At least some embodiments of the present invention are characterized in that, in the above configuration, the entangled yarn is a flat yarn.

According to this configuration, the contact area with the single-twisted yarn that constitutes the weft increases, and the entangled yarn is less likely to slip in the width direction. It is possible to prevent the end of the direction from being frayed.

At least some embodiments of the present invention provide a method for producing an endless papermaking felt base fabric (12) in a machine direction, the method comprising producing a narrow width base fabric (11) narrower than the papermaking felt base fabric. A step of manufacturing, a step of spirally winding the narrow base cloth, joining adjacent width direction end portions to each other, and cutting both end portions in the machine cross direction along the machine direction, The step of producing the narrow base fabric includes weaving a warp yarn (13) and a weft yarn (14) including at least one monofilament yarn of 50% or more and at least one monofilament yarn at the same time, and at the same time, forming a entanglement yarn (15) into the weft yarn (15). A step of weaving the warp, the weft and the entwined yarn along the length direction in the vicinity of the entwined yarn; The step of removing the warp yarns existing outside the.

According to this structure, since the entangled weave (16) is formed at the widthwise end of the narrow base fabric, the narrow base fabric is suppressed from fraying, and the joint portion has a sufficient strength for the papermaking felt base. The fabric can be easily manufactured.

According to the present invention, it is possible to provide a felt base fabric for papermaking and a method for producing the felt base fabric for papermaking, in which the joint portion of the narrow base fabric has sufficient strength.

The top view which shows the example of the edge part of the width direction of the narrow base cloth which concerns on embodiment. The top view which shows the other example of the edge part of the width direction of the narrow base cloth which concerns on embodiment. The top view which shows the edge part of the width direction of the narrow base cloth which concerns on the modification of embodiment. Perspective view according to the embodiment Photographs of narrow base fabrics according to comparative examples and examples Photographs of joints of narrow base fabrics according to comparative examples and examples Illustration of how to make papermaking felt base fabric from narrow width base fabric

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an end portion in the width direction of a narrow base fabric 11 according to an embodiment of the present invention, FIG. 3 shows an end portion in the width direction of a modified example thereof, and FIG. And a felt base fabric 12 for papermaking made from a narrow base fabric 11. The machine direction means the traveling direction of the papermaking felt attached to the papermaking machine, and the machine cross direction means the widthwise direction of the papermaking felt orthogonal to the machine direction. The length direction and the width direction refer to the long side direction and the short side direction of the small width base fabric 11, respectively. In the papermaking felt base cloth 12, the length direction is inclined with respect to the machine direction by an inclination α for forming a spiral when the narrow width base cloth 11 is spirally wound to form the papermaking felt base cloth 12. ing.

Regarding the width of the narrow base cloth 11, if the width is narrow, the number of laps required to reach the product width increases, so that it takes time and effort to manufacture the product, and if the width is wide, waste when cutting increases and waste and cost increase. Therefore, 60 to 100 cm is preferable.

The narrow base fabric 11 includes a warp yarn 13 extending in the length direction, a weft yarn 14 woven in the warp yarn 13 and extending in the width direction, and a entanglement yarn 15 extending in the length direction and arranged at an end portion in the width direction. With. In the present embodiment, the warp yarns 13 and the weft yarns 14 form a plain weave design, but they may also be constructed in other weaves. Each of the warp yarn 13, the weft yarn 14, and the entangled yarn 15 is made of a filament such as a polyamide resin or a polyester resin. The polyamide resin is preferably an aliphatic polyamide resin, more preferably nylon. Examples of nylon include nylon 66, nylon 6, nylon 12, nylon 11, nylon 610 and nylon 612. The polyester resin is not particularly limited as long as it is a polyester composed of dicarboxylic acid and glycol, and may be polyethylene terephthalate (PET), polypropylene terephthalate, polybutylene terephthalate (PBT), polyethylene naphthalate or the like. ..

The warp 13 is preferably a monofilament having a circular cross section and a diameter of 0.35 mm to 0.45 mm.

50% to 100% of the yarns constituting the weft yarn 14 are single-twisted yarns. The single-twisted yarn is made by aligning several filaments and twisting them. The number of twists of the single twist yarn is 19 to 32 times per 10 cm, and more preferably 23 to 28 times. The single twisted yarn is composed of three monofilaments. The single-twisted yarn may be composed of two or four or more monofilaments, but when the number of the single-twisted yarn is three, the balance between the flexibility and the compression resistance of the single-twisted yarn is the best. Further, each of the filaments forming the single twisted yarn preferably has a circular cross section and a diameter of 0.18 mm to 0.30 mm, and more preferably a diameter of 0.20 mm to 0.28 mm. The yarns forming the weft yarns 14 may all be the same single-twisted yarn, or may be a combination of yarns other than the single-twisted yarn. When the weft yarn 14 includes a yarn other than a single-twisted yarn, the yarn can be a filament having a thickness similar to that of the single-twisted yarn. For example, the filament has a circular cross section and a diameter of 0.35 mm to 0. It can be a 50 mm monofilament, a monofilament plied yarn or a multifilament plied yarn. It is preferable that the single-twisted yarn and the other yarns are arranged in a good balance over the entire narrow width base fabric 11.

The entangled yarn 15 is a monofilament or a multifilament. In the present embodiment, two entangled yarns 15 form an entangled weave 16. The entangled weave 16 is a “sam”, that is, one entangled yarn 15 passes through the front side of the weft 14, the other entangled yarn 15 passes through the back side of the weft 14, and each time the weft 14 passes through one another. Between the two adjacent weft yarns 14, it is configured to pass through the surface side of one entanglement yarn 15. The entangled weave 16 may be modified so as to pass through the front side of one of the entangled yarns 15 every time the other entangled yarn 15 passes through a plurality of wefts 14, and as shown in FIG. The entangled yarn 15 may be changed to the warp yarn 13 to form the entangled weave 16. The entangled yarn 15 preferably has a diameter of 0.15 mm to 0.25 mm when the cross-sectional shape is circular, and has a long side of 0.20 to 0.40 mm×short side of 0.15 mm when the cross-sectional shape is rectangular. It is preferable that the ratio is 10 to 0.25 mm and the ratio of long side/short side is 1.6 to 4.0.

The entangled yarn 15 may be fluorescent yarn. The fluorescent yarn is the same color as the warp yarn 13 and does not usually emit light, but it is preferable that the fluorescent yarn emits light by irradiating light of a specific wavelength such as ultraviolet rays. In this case, it can emit light only when it is desired to check. , Visibility is good.

The entangled weave 16 is provided in two rows at each of both ends in the width direction of the narrow base fabric 11. Two warp yarns 13 extend between the two rows of entangled weaves 16 at each end. It is preferable to provide two rows of the entangled weave 16 at each end, but the number of rows of the entangled weave 16 at each end and the number of warp threads 13 between two adjacent rows can be appropriately changed. In FIG. 1, one of the two entangled yarns 15 forming the entangled weave 16 is straight and the other is entangled. In FIG. 2, both entangled yarns are bent. 16 can be in either state.

Next, the function and effect of the narrow base cloth 11 will be described. The entangled weave 16 is less likely to be frayed than a plain weave. Furthermore, since the entanglement yarn 15 that intersects with the weft yarn 14 including the single-twisted yarn is caught on the unevenness of the surface of the single-twisted yarn and becomes difficult to slip with respect to the weft yarn 14, fraying is suppressed. Further, since the single twisted yarn has a high flexibility, it is greatly bent in the state of being woven into the warp yarns 13, and the catching with the entanglement yarns 15 becomes stronger and the fraying is further suppressed. When such a single twist yarn occupies 50% or more of the weft yarn 14, sufficient catching with the entanglement yarn 15 can be secured. Further, when a part of the weft yarn 14 is made into a yarn having a lower flexibility than a mono-twisted yarn such as a monofilament having a thickness equal to or larger than the mono-twisted yarn, dimensional stability can be improved. In addition, by using three monofilaments for constituting the single-twisted yarn and setting the number of twists of the single-twisted yarn to 32 times or less per 10 cm, the high twistability is maintained and the entanglement yarn 15 is prevented from being unraveled. Problems such as warp during weaving can be prevented, and by setting the number of twists of the single-twisted yarn to 19 times or more per 10 cm, it is possible to prevent the single-twisted yarn from being crushed easily and suppress deterioration of compression resistance. Further, although a thin yarn has low compression resistance and is easily crushed, a decrease in compression resistance can be suppressed by setting the thickness of the single twist yarn to 0.18 mm or more. Further, if the yarn is thick, it is necessary to reduce the number of threads to be driven, but by setting the thickness of the single-twisted yarn to 0.30 mm or less, the number of threads to be driven can be secured, and the number of wefts 14 on which the entanglement thread 15 is caught can be secured.

If the entanglement yarn 15 is too thin, it causes a manufacturing problem that yarn breakage easily occurs during weaving, and if it is too thick, the entanglement yarn 15 protrudes on the surface of the base fabric and causes a mark on the paper to be produced. These problems are suppressed by making the cross-sectional shape of the entangled yarn 15 into a circle having a diameter of 0.15 mm to 0.25 mm or a rectangle having a long side of 0.20 to 0.40 mm and a short side of 0.10 to 0.25 mm. can do. Further, when a flat yarn is used as the entangled yarn 15, the contact area with the single-twisted yarn forming the weft yarn 14 increases, and the fraying can be further suppressed. When a fluorescent yarn is used as the entanglement yarn 15, the end portion of the narrow base cloth 11 is easily visible, and the work of arranging the narrow base cloth 11 in a spiral shape and joining the adjacent width direction end portions is facilitated. It is possible to prevent any sewing.

Next, a method of manufacturing the felt base fabric 12 for papermaking will be described.

First, the narrow base cloth 11 is woven. The warp yarn 13 and the weft yarn 14 are woven together and the entanglement yarn 15 is woven at the same time to create a design wider than the narrow base fabric 11. The outer side in the width direction in the vicinity of the entangled yarn 15 of the tissue in which the entangled yarn 15 is woven is cut along the length direction. The broken lines in the upper diagrams of FIGS. 1 and 2 are examples of the cutting position. The warp yarns 13 existing outside the entangled yarns 15 of the cut tissue are removed to obtain the narrow width base fabric 11 (lower diagrams of FIGS. 1 and 2). The narrow base cloth 11 can be manufactured in advance because a common one can be used regardless of the dimensions of the paper-making felt base cloth 12 to be manufactured.

After the dimensions of the paper-making felt base cloth 12 to be manufactured are determined, joint marks 17 indicating the circumference when the narrow width cloth 11 is spirally wound are attached to both ends of the small width cloth 11 with a felt pen or the like. Alternatively, colored threads, fluorescent threads, or the like may be woven at regular intervals so as to serve as marks during weaving (FIG. 4). By providing the joint mark 17, it is possible to prevent the spiral winding position from being displaced, for example, because the circumferential length of the manufactured paper manufacturing felt base fabric 12 is different between the left and right.

Next, the narrow base cloth 11 is spirally wound, and is rotated once to join the ends of the adjacent small width base cloths 11 to each other in sequence. The ends to be joined may be overlapped or abutted. For the joining, known sewing means can be used as well as sewing with a sewing machine. The sewing line may be formed diagonally with respect to the length direction while being folded back with the inner entangled weave 16 like zigzag stitches. When a fluorescent yarn is used as the entanglement yarn 15, the end portion of the narrow base fabric 11 has high visibility, and the deviation of the joining can be prevented. The work of spirally winding the narrow base cloth 11 and joining the ends is continued until the width in the machine cross direction becomes a desired length.

The small width base cloth 11 wound in a spiral shape and joined is endless in the machine direction, but a step is formed at both ends in the machine cross direction by the width of the small width base cloth 11 (FIG. 7( See C)). Therefore, the felt base cloth 12 for papermaking is completed by cutting both ends in the machine cross direction of the small width base cloth 11 spirally wound and joined by a known means such as a heat cutter along the machine direction. To do.

The felt base cloth 12 for papermaking is laminated with a base cloth made of a hollow weave or a small width base cloth 11 by spirally winding in the opposite direction to be joined to form a multi-layered base cloth. A staple fiber sheet is formed by needling a short fiber sheet to a cloth to form a batt fiber layer.

An example of the present invention will be described in comparison with a comparative example with reference to FIG. (A1) to (a3) are photographs of the narrow width base cloth 21 according to the comparative example, and (b1) to (b3) are photographs of the small width base cloth 11 according to the example of the present invention. Both show the state after weaving each thread and before cutting the end in the width direction. In the narrow width base fabric 21 according to the comparative example, reference numerals 23, 24, 25 and 26 indicate warp yarns, weft yarns, entangled yarns and entangled weaves, respectively.

In the examples and comparative examples of the present invention, both warp yarns 13 and 23 are monofilaments having a circular cross-sectional shape with a diameter of 0.40 mm, and both entanglement yarns 15 and 25 are circular filaments having a diameter of 0.20 mm. It was a monofilament having a cross-sectional shape. All of the wefts 14 of the examples of the present invention are single-twisted yarns in which three nylon yarns are aligned and twisted, and each nylon yarn has a circular cross-sectional shape and a diameter of 0.20 mm. Met. All of the weft yarns 24 of the comparative example were monofilaments having a circular cross-sectional shape with a diameter of 0.40 mm. In addition, the warp threads 13 and 23 and the weft threads 14 and 24 form a plain weave design, and the weaving method of the entanglement threads 15 and 25 is common to the example of the present invention and the comparative example.

As shown in FIGS. 5(a1) to (a3), the warp yarns 23 and the weft yarns 24 of the narrow base fabric 21 according to the comparative example are both monofilaments having a circular cross-sectional shape with a diameter of 0.40 mm, and have flexibility. Since it is lower than the twisted yarn, they pushed back each other and bent equally. On the other hand, in the narrow width base fabric 11 according to the example of the present invention, as shown in FIGS. 3(b1) to (b3), the weft yarn 14 is a single-twisted yarn having higher flexibility than the warp yarn 13, and therefore the warp yarn 13 is bent. Was small and the bending of the weft yarn 14 was large. The entangled yarn 15 was caught in the bending of the weft yarn 14 and the unevenness of the surface, and the slip in the width direction was prevented.

The weft yarn 24 of the comparative example shown in FIG. 6A was composed of a monofilament, and the weft yarn 14 of the embodiment of the present invention shown in FIG. 6B was composed of a single twist yarn. One or two rows of entangled weaves 16 and 26 are provided at the widthwise end portions of the narrow width base fabrics 11 and 21. For each of the comparative example and the example, the widthwise ends of the two small width base fabrics 11 and 21 were joined to each other using a sewing machine to prepare a sample having a length of 20 cm and a width of 3 cm. A load was applied to the sample in the width direction of the narrow width base fabrics 11 and 21, that is, in the left-right direction of FIG. 6, a tensile test was performed on the joint, and the strength (load) at break was measured. Tensileon universal testing machine RTG-1310 manufactured by A&D Co., Ltd. was used for the tensile test, the test speed was set to 200 mm/min, and each sample was tested twice to obtain the average value. It was Table 1 shows the test results.

In each of the case where the entangled weaves 16 and 26 are in one row and the case where the entanglement weaves are in two rows, the strength (load) at break is larger in the case of using the single twist yarn as the weft than in the case of using monofilament, and the strength of the joint portion Was high. Further, if the wefts are the same, the strength (load) at the time of breaking is greater when the entangled weaves 16 and 26 are in two rows than in one row, and the strength of the joint is higher.

Although the specific embodiments have been described above, the present invention is not limited to the above embodiments and can be widely modified and implemented. For example, the filament may be replaced with spun yarn.

11: Narrow width base cloth 12: Felt base cloth for papermaking 13: Warp thread 14: Weft thread 15: Entangled thread 16: Entangled weave 17: Joint mark

Claims (9)

A felt base cloth for papermaking that is endless in the machine direction and is formed by spirally winding a narrow base cloth and joining the widthwise end portions to each other.
The narrow base cloth is
Warp extending in the length direction,
A weft that is woven into the warp and extends in the width direction,
The end portion in the width direction is provided with a entwined yarn woven with a entwined weave so as to extend in the length direction,
50% or more of the weft, Ri Do from single twisting, papermaking felt base fabric at least one of the weft, characterized in that it consists of monofilaments. The felt-based fabric for papermaking according to claim 1, wherein the one-twisted yarn is a yarn obtained by twisting three monofilaments, and the twist number of the one-twisted yarn is 19 to 32 times per 10 cm. The warp has a circular cross-sectional shape with a diameter of 0.35 to 0.45 mm,
Each of the monofilaments forming the one-plied yarn has a circular cross-sectional shape with a diameter of 0.18 to 0.30 mm,
The entangled yarn has a circular cross-sectional shape with a diameter of 0.15 to 0.25 mm, or a rectangular cross-sectional shape with long sides of 0.20 to 0.40 mm and short sides of 0.10 to 0.25 mm. The felt base fabric for papermaking according to claim 2, which comprises: The felt base cloth for papermaking according to any one of claims 1 to 3, wherein the entangled woven fabric is configured by weaving the two entangled yarns together. The felt base cloth for papermaking according to any one of claims 1 to 3, wherein the entangled fabric is configured by weaving one of the entangled yarns into one of the warp yarns. The felt base cloth for papermaking according to any one of claims 1 to 5, wherein the entangled weave is provided in two rows at each of both ends in the width direction. The felt base fabric for papermaking according to any one of claims 1 to 6, wherein the entangled yarn is a fluorescent yarn. The felt base cloth for papermaking according to any one of claims 1 to 7, wherein the entangled yarn is a flat yarn. A method for manufacturing an endless paper-making felt base fabric in a machine direction, comprising:
Manufacturing a narrow base cloth having a width narrower than the felt base cloth for papermaking,
A step of spirally winding the narrow base cloth, and adjoining adjacent width direction end portions to each other;
Cutting both ends in the machine cross direction along the machine direction,
The step of manufacturing the narrow base cloth,
Weaving a warp yarn and a weft yarn including at least one monofilament of 50% or more and at least one monofilament yarn into each other, and at the same time weaving a entangled yarn into the weft yarn;
Cutting the texture in which the warp yarn, the weft yarn, and the entangled yarn are woven along the length direction in the vicinity of the entangled yarn,
Removing the warp yarns existing in the width direction outer side than the entangled yarns from the cut tissue.