JP2023183611A - seam felt for paper making - Google Patents

Abstract

To provide a seam felt for paper making allowing a core wire to be easily inserted into loops by engaging the loops with each other.SOLUTION: A seam felt for paper making 1 has a felt body 2 with loops on both ends in a length direction and a pair of temporary connectors 3 used to engage the loops on both ends with each other. The pair of temporary connectors 3 is connected with each other and disposed in a predetermined range of both ends of the felt body 2, and both ends of the felt body 2 are abutted against each other so that abutting part 9 are formed into a mountain shape. As a water soluble resin 4 is applied to the abutting parts 9, the abutting parts are prevented from warping. The water soluble resin 4 is removed by a water circulating operation performed before manufacturing paper.SELECTED DRAWING: Figure 3

Description

The present invention relates to a papermaking seam felt provided with an auxiliary tool for joining both ends to each other.

Papermaking felt is used in the press section of a papermaking machine to transport the wet paper that is to be squeezed. In order to improve the work efficiency when attaching papermaking felt to a papermaking machine, so-called seam felt is created by drawing felt with an end into a felt running path, or so-called felt run, and then joining both ends to make it endless. is widely used. In this type of seam felt, the loops formed at the ends in the length direction by folding back the warp yarns that make up the base fabric are interlocked alternately so that the loop holes are aligned with each other, and the core wire is inserted into the common hole formed by this. A common configuration is to connect both ends through the wire.

Since joining such seam felt requires precise manual work, it is desirable to perform the work with the edges of the felt stabilized. Furthermore, in order to make it easier to visually confirm the interlocking state of the loops and the insertion state of the core wire, it is desirable to butt the ends of the felt in a mountain shape. Therefore, by sewing a temporary joint with a sliding zipper to the end of the felt in advance and hooking the zipper after the felt has been drawn in, both ends of the felt are temporarily secured, and the felt is It is known that both ends are held in a state where they are butted against each other in a mountain shape (Patent Documents 1 to 3). Further, Patent Document 4 describes that a liquid resin is applied to the loop in order to facilitate the drawing operation of the core wire.

Japanese Unexamined Patent Publication No. 62-250294 Japanese Patent Application Publication No. 2005-264402 Japanese Patent Application Publication No. 2010-275671 Japanese Patent Application Publication No. 2010-065343

In recent years, the demand for lightweight seam felt has increased due to the demands of paper manufacturing machines. The lightweight seam felt has lower rigidity than conventional products. In particular, if the bending elastic modulus (bending rigidity) in the length direction is low, when the ends of the seam felt are butted together in a mountain shape, the inclined surfaces forming the mountain shape will warp in a concave manner, making it difficult for the loops to interlock. Furthermore, if the seam felt has a low bending elastic modulus in the width direction, the top of the mountain shape may be bent or depressed downward during insertion of the core wire, making it difficult to insert the core wire. Engaging the loops and threading the lead wire can be done within 10 minutes per meter with relatively heavy and highly rigid seamed felt, whereas it can take more than 30 minutes per meter with relatively light and less rigid seamed felt. In the worst case scenario, the core wire could not be completely inserted and the wire could be unhooked.

In view of the above background, it is an object of the present invention to provide a seam felt for paper making that can easily perform the work of interlocking loops and inserting a core wire into the loops, even if the seam felt is lightweight and has low rigidity. The task is to

In order to solve the above problems, a papermaking seam felt (1) according to an embodiment of the present invention includes a base fabric (5) and a batt fiber layer (6) integrated with the base fabric, and includes a base fabric (5) and a batt fiber layer (6) integrated with the base fabric. A pair of butt portions (9) are provided with a plurality of loops (7) to be interlocked with each other at both ends, and are defined in a predetermined range from both ends toward the center in the length direction in the length direction. and an intermediate portion (10) defined between the pair of abutting portions, and a felt body (2) that is detachable at the boundary between the pair of abutting portions and the intermediate portion of the felt body. a pair of ends that are attached so that they can be engaged with and disengaged from each other, and that, in the mutually engaged state, the two end portions are held in abutted state so that the pair of abutment portions form a chevron shape; a temporary joint (3), and at least one of the pair of abutting portions has a water-soluble resin (4) coated on at least one surface of the batt fiber layer in the vicinity of the loop. The length of the applied water-soluble resin in the length direction is 1/2 or more of the length of the abutted portion in the length direction.

According to this aspect, the water-soluble resin reinforces the rigidity of the abutted portion in the length direction, so that warping of the abutted portion that is abutted in a mountain shape is suppressed, and the work of interlocking the loops and inserting the core wire into the loops is suppressed. can be easily done.

In the above aspect, the length in the length direction of the water-soluble resin (4) applied to the abutted portion (9) may be 3 cm or more and 8 cm or less.

According to this aspect, the size of the application range of the water-soluble resin (4) is large enough to easily perform the loop engagement work, and the bending in the length direction that is applied to the butt part during the loop engagement work and the core wire insertion work. The moment does not become excessive, and warping can be suppressed by reinforcing with water-soluble resin.

In the above aspect, the abutted portion before the water-soluble resin is applied may have a bending elastic modulus of 7.0 MPa or less in the length direction.

According to this aspect, the bending rigidity does not become so excessive that it impedes workability.

In the above embodiments, the water-soluble resin may include polyvinyl alcohol, carboxymethylcellulose, polyvinyl acetate or modified starch, or a combination thereof.

According to this aspect, the stiffness reinforcing effect by the water-soluble resin and the removability of the water-soluble resin by the water-spinning operation are good.

In the above aspect, the water-soluble resin (4) contains polyvinyl alcohol, and the water-soluble resin applied to the abutting portion (9) has an areal density of 20 g/m ² or more and 40 g/m ² or less. You may do so.

According to this aspect, the stiffness reinforcing effect by the water-soluble resin and the removability of the water-soluble resin by water-spinning operation become even better.

According to the above aspect, even if the seam felt is lightweight and has low rigidity, it is possible to provide a seam felt for paper making that can easily perform the work of interlocking the loops and inserting the core wire into the loop hole.

A perspective view showing a papermaking seam felt according to an embodiment. A perspective view showing a felt body of a papermaking seam felt according to an embodiment. A vertical cross-sectional view showing the vicinity of the joint of the papermaking seam felt according to the embodiment. A plan view showing the vicinity of the joint of the papermaking seam felt according to the embodiment. A plan view showing the vicinity of a joint of a papermaking seam felt according to a modification of the embodiment. Front view showing a testing device for measuring physical properties related to flexural modulus

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a joint part of a papermaking seam felt 1 according to an embodiment. In the following description, the term "length direction" refers to the length direction (longitudinal direction) of the papermaking seam felt 1, and the term "width direction" refers to the width direction (weft direction) of the papermaking seam felt 1. means.

As shown in FIG. 1, a papermaking seam felt 1 consists of a felt body 2 that is attached to a papermaking machine (not shown) such as a paper machine or a pulp machine to transport wet paper to be water-squeezed, and a felt body 2 that It includes a pair of temporary joint tools 3 that are used to join both ends in the length direction and are removed after the ends are joined. A water-soluble resin 4 is applied near the end of the felt body 2.

FIG. 2 is a perspective view of the felt main body 2. As shown in FIG. 2, the felt body 2 includes a base fabric 5 and a batt fiber layer formed by needling a short fiber sheet of synthetic resin such as polyamide, polyester, polyethylene, polypropylene, or polyvinyl chloride into the base fabric 5. 6. A plurality of loops 7 are formed at both ends of the base fabric 5 in the length direction, respectively. The felt body 2 is used in a press part of a paper making machine, and the loops 7 provided at both ends are engaged with each other, and the core wire 8 (see Fig. 3) is inserted into the hole defined by the loops 7 to join the ends. This makes it endless, the inner surface (running surface side) is supported by a roll (not shown) of a paper making machine, etc., and the outer surface (paper making surface side) supports the wet paper web. Each loop 7 is formed by folding back the warp threads of the base fabric 5. The loops 7 protrude from the batt fiber layer 6. In the following description, the "proximal end" of the loop 7 means the portion of the loop 7 that begins to protrude from the batt fiber layer 6.

FIG. 3 is a longitudinal cross-sectional view of the seam felt 1 for papermaking around the joint. As shown in FIGS. 1 and 3, the felt main body 2 has a pair of abutting portions 9 defined in a predetermined range from both ends toward the center in the length direction, and a pair of abutting portions 9 in the length direction. and an intermediate portion 10 defined between. The lengths of the pair of abutting portions 9 in the height direction may be equal to each other or may be different from each other.

Each of the pair of temporary joints 3 includes a fabric portion 11 fixed to the surface of the felt body 2 and a fastener element portion 12 attached to one end edge of the fabric portion 11. Moreover, a slider 13 for engaging the pair of fastener element parts 12 with each other and for releasing the engagement is slidably attached to either one of the pair of fastener element parts 12. That is, the pair of temporary joints 3 are joined to each other by a wire fastener (slide fastener).

The pair of temporary joint tools 3 are arranged so that the fastener element parts 12 can face each other in the vicinity of the edge of the fabric part 11 opposite to the edge to which the fastener element part 12 is attached. The felt body 2 is sewn by thread 14. The fastener element portion 12 extends parallel to the width direction. The sewing line of the thread 14 used to sew the fabric portion 11 onto the felt body 2 extends in the width direction and forms the boundary between the abutment portion 9 and the intermediate portion 10 in the felt body 2 . The distance from this sewing line to the fastener element portion 12 is shorter than the distance from this sewing line to the loop 7. Therefore, when the fastener element portions 12 of the pair of temporary joints 3 are engaged with each other and both ends of the felt body 2 in the length direction are butted against each other, the abutted portions 9 are formed such that the abutted ends are apexes. It forms a mountain shape. The method of sewing the thread 14 used to sew the temporary joint 3 onto the felt body 2 is preferably double chain stitching using a sewing machine.

At each of both ends of the felt body 2 in the length direction, the distance from the tip of the loop 7 to the thread 14 for sewing the temporary joint 3 to the felt body 2, that is, the length of the butt part 9 in the length direction is 4 cm or more. And it is preferably 10 cm or less, and more preferably 6 cm or more and 8 cm or less. This embodiment is for paper manufacturing, including a butt part 9 having a bending elastic modulus in the length direction of 7.0 MPa or less, preferably 5.0 MPa or less, and more preferably 3.0 MPa or less before applying the water-soluble resin 4. Preferably, it is applied to seam felt 1.

FIG. 4 is a plan view of the seam felt 1 for papermaking around the joint. As shown in FIG. 4, a water-soluble resin 4 is applied to the surface of the batt fiber layer 6 at the butt portion 9. In the illustrated example, the water-soluble resin 4 is applied to the surface of the felt main body 2 opposite to the side on which the temporary joint tool 3 (see FIG. 3) is attached, but instead of the felt It may be applied to the same surface of the main body 2 as the side on which the temporary joint tool 3 is attached, or it may be applied to both surfaces. It is preferable that the water-soluble resin 4 is applied over the entire width direction. The water-soluble resin 4 preferably has a length in the length direction of the butted portion 9 that is 1/2 or more of the length in the length direction of the butted portion 9, and the edge of the water-soluble resin 4 on the loop 7 side is It is preferable to be located at a position that substantially overlaps the edge of the batt fiber layer 6 in the length direction or the base end of the loop 7 in plan view. Note that the application range of the water-soluble resin 4 described here is the one at the time of application, and the applied water-soluble resin 4 may seep into the surrounding area by capillary action or the like before it dries. As the water-soluble resin 4, for example, polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), polyvinyl acetate (PVAc), modified starch, or a combination thereof can be used. Any resin that can be used effectively can be used. The areal density of the water-soluble resin 4 is more preferably 20 g/m ² or more and 40 g/m ² or less, and even more preferably 30 g/m ² or more and 40 g/m ² or less.

FIG. 5 is a plan view of the vicinity of the joint according to a modification of the papermaking seam felt 1. As shown in FIG. As shown in FIG. 5, the edge of the water-soluble resin 4 on the loop 7 side is located at a position that substantially overlaps the edge of the batt fiber layer 6 in the length direction, or the base end of the loop 7 in plan view, and the water-soluble resin The edge of 4 on the intermediate portion 10 side may be located at or near the boundary between the abutting portion 9 and the intermediate portion 10. If the water-soluble resin 4 is applied across the boundary between the abutting part 9 and the intermediate part 10, it will be difficult to sew the temporary joint 3 onto the felt body 2, so the water-soluble resin 4 is applied across this boundary. It is preferable that the coating be applied to the abutting portion 9 so as not to exceed .

With reference to FIGS. 1 and 3, a method for joining both ends of the papermaking seam felt 1 in the length direction will be described.

After manufacturing the felt main body 2 at a manufacturing factory for papermaking seam felt 1, a water-soluble resin 4 is applied to the abutting portion 9, and a pair of temporary joints 3 are sewn to the felt main body 2. The papermaking seam felt 1 is shipped from a manufacturing factory and transported to a papermaking factory. Workers will perform the following tasks at the paper mill.

First, the papermaking seam felt 1 is drawn into the travel path of the papermaking machine, and both ends of the felt body 2 are brought close to face each other.

Next, in the pair of temporary joints 3, the slider 13 is slid over the pair of fastener element parts 12 to engage the fastener element parts 12 with each other. Since the pair of temporary joints 3 are attached near both ends of the felt body 2, both ends of the felt body 2 can be held in a state where they are brought together. At this time, the distance from the sewing line of the thread 14 sewing the pair of temporary joints 3 to the felt body 2 to the fastener element part 12 is shorter than the distance from this sewing line to the loop 7, so the butt part 9 has a convex mountain shape on the side opposite to the temporary joint tool 3.

Next, the holes of the loops 7 are aligned in the width direction so that the loops 7 at both ends in the length direction are arranged alternately from one end in the width direction to the other end. A lead wire (not shown) connected to the core wire 8 is passed through the hole. When the lead wire reaches the other end in the width direction, pull the lead wire and pass the core wire 8 through the hole of the loop 7.

Thereafter, the slider 13 is slid in the opposite direction to release the engagement of the fastener element portion 12. Furthermore, the thread 14 is untied and the temporary joint tool 3 is removed from the felt main body 2.

The water-soluble resin 4 is removed from the felt body 2 by introducing water into the paper-making machine instead of the paper raw material and operating the paper-making machine.

The effects of the above embodiment will be explained.

Since the water-soluble resin 4 reinforces the bending elastic modulus in the length direction of the portion of the felt body 2 near the loop 7, warping of the abutted portion 9 in a mountain shape is suppressed, and the lead wire and core wire 8 are looped. The work of passing it through the hole 7 becomes easier and the work time is shortened.

Furthermore, since the water-soluble resin 4 reinforces the bending elastic modulus in the width direction of the portion of the felt body 2 near the loops 7, when the lead wire is inserted into the hole of the loop 7, the row of the loops 7 is It is suppressed from being dented or bent, and the work of passing the lead wire and core wire 8 through the hole of the loop 7 is facilitated, and the work time is shortened.

Since the water-soluble resin 4 is removed by the water spinning operation, it does not adversely affect the performance of the paper making machine. In addition, since the water spinning operation is an operation performed to adapt the felt body 2 to the paper making machine regardless of the presence or absence of the water-soluble resin 4, new operations for removing the water-soluble resin 4 are substantially unnecessary. Does not occur.

If the areal density of the water-soluble resin 4 is less than 20 g/m ² , the rigidity of the abutting portion 9 will not be sufficiently reinforced, and if the areal density of the water-soluble resin 4 is greater than 40 g/m ² , the rigidity of the abutting portion 9 will be Although the reinforcement is sufficient, it is necessary to increase the water running time to remove the water-soluble resin 4. Since the areal density of the water-soluble resin 4 is 20 g/m ² or more and 40 g/m ² or less, both reinforcement of rigidity and removal efficiency of the water-soluble resin 4 can be achieved.

If the areal density of the water-soluble resin 4 is too large, the rigidity of the butt portion 9 will become too high, and when the loops 7 at both ends in the length direction are engaged with each other, the position of the loops 7 may be changed by bending the strings, etc. Fine adjustments become difficult. Since the areal density of the water-soluble resin 4 is 20 g/m ² or more and 40 g/m ² or less, both core wire insertion workability and removal efficiency of the water-soluble resin 4 can be achieved.

Since the length of the water-soluble resin 4 in the length direction is 3 cm or more and 8 cm or less, the loops 7 can be easily engaged. In addition, if the application range of the water-soluble resin 4 is about this size, the bending moment in the length direction applied to the butt part 9 during the loop engagement work and the core wire insertion work will not become excessive, so that the plate-shaped stiffening Even if the water-soluble resin 4 has a smaller rigidity reinforcing effect than when a member (not shown) is attached, warping of the abutting portion 9 can be suppressed.

The bending elastic modulus in the longitudinal direction was measured for the two test pieces 15 before applying the water-soluble resin. Figure 6 shows the test device 16 (testing machine: Strograph type E3-L (Toyo Seiki Seisakusho), jig: 3-point bending jig type F-0 (Toyo Seiki Seisakusho)) that measured the bending elastic modulus. show. The test device 16 includes a pair of support stands 17 which have a support stand radius of 5 mm (the roundness of the opposing ends of the surface supporting the test piece 15) and are arranged so that the distance between the supporting points is 40 mm. , and an indenter 18 having an indenter radius of 5 mm. The bending speed was 5 mm/min, the test piece size was 100 mm x 25 mm, and the number of tests was 3 times each in a constant temperature and humidity room with a room temperature of 19.5°C and a humidity of 65%. The flexural modulus was measured after being left indoors for more than 24 hours. In addition, for each test piece 15, the ends in the length direction are butted against each other so that the butt part 9 having a length in the length direction is 8 cm in the shape of a mountain, and the loops 7 at both ends in the length direction are interlocked with each other to form the core wire 8. I worked on inserting it. Table 1 shows the results.

The second test piece, which had a relatively high flexural modulus, could be worked without problems in both the interlocking work and the core wire insertion work. The first test piece, which had a relatively low flexural modulus, was difficult to engage and insert the core wire, and the work took more time than the second test piece.

For the first test piece, which was difficult to engage and insert the core wire as it was, water-soluble resin 4 made of polyvinyl alcohol resin was applied at an areal density of 5, 10, 20, 30, 40, 50, and 60 g/ ^m2. Then, the mating work and core wire insertion work were performed. The length of the abutted portion 9 in the length direction was 8 cm, and the length of the water-soluble resin 4 in the length direction was 5 cm from the base end of the loop 7. The water-soluble resin 4 was applied using a spray gun. The results are shown in Table 2.

If the coating amount of the water-soluble resin 4 was less than 10 g/m ² , the rigidity was not imparted so much that it was difficult to engage the loops 7 and insert the core wires. When the amount of water-soluble resin 4 applied is 10 g/m2 ^or more, the workability of interlocking the loops 7 is improved, and especially when it is 20 to 40 g/ ^m2 , both the work of interlocking the loops 7 and the work of inserting the core wire are easy to do. It was carried out without any problems. Regarding the coating amounts of the water-soluble resin 4 of 50 g/m ² and 60 g/m ² , the workability of interlocking the loops 7 was improved, but the work of inserting the core wire was somewhat difficult. This is because the large amount of resin causes the resin to enter into the loop 7 a little, causing resistance and hindering the insertion of the core wire.

When the length of the first test piece is 6 cm, water-soluble resin 4 made of polyvinyl alcohol resin is applied at lengths of 2, 3, 4, and 6 cm in the length direction (length from the proximal end of loop 7). After coating, the mating work and core wire insertion work were performed. In addition, for the case where the length direction length of the first test piece is 8 cm, the water-soluble resin 4 made of polyvinyl alcohol resin was added to the length direction length (length from the proximal end of the loop 7) 2, 3, 4, A thickness of 6 to 8 cm was applied, and the interlocking work and core wire insertion work were performed. The surface density of the applied water-soluble resin 4 was 40 g/m ² . The results are shown in Table 3.

If the length in the length direction of the water-soluble resin 4 is less than 1/2 of the length in the length direction of the butt portion 9, the portions to which the water-soluble resin 4 is not applied will be greatly warped, making it difficult to engage the loops 7 and insert the core wire. It was difficult to work. If the length in the length direction of the water-soluble resin 4 is 1/2 or more of the length in the length direction of the abutting portion 9, even if the part to which the water-soluble resin 4 is not applied is warped, the effect will be small, and the meshing of the loops 7 will be The work and core wire insertion work were easy to do.

This concludes the description of the specific embodiments, but the present invention is not limited to the above embodiments and modifications, and can be implemented in a wide range of modifications. Instead of a wire fastener, the pair of temporary joints may be temporarily joined using a point fastener provided with a plurality of snap buttons or the like, or may be temporarily joined using a hook and loop fastener, and each of the temporary joints main bodies may be temporarily joined. A plurality of holes may be provided, and the temporary bonding may be performed using a string or the like inserted through these holes. Instead of sewing the pair of temporary joints after applying the water-soluble resin, the water-soluble resin may be applied after sewing the pair of temporary joints.

1: Seam felt for papermaking 2: Felt body 3: Temporary joint tool 4: Water-soluble resin 6: Batt fiber layer 7: Loop 8: Core wire 9: Butt part 10: Intermediate part

Claims (5)

It includes a base fabric and a batt fiber layer integrated with the base fabric, and a plurality of loops to be interlocked with each other are provided at both ends in the length direction, and in the length direction, from the both ends to the center in the length direction. a felt body divided into a pair of abutting portions defined in a predetermined range toward the felt body, and an intermediate portion defined between the pair of abutting portions;
It is removably attached to the boundary between the pair of abutting portions and the intermediate portion of the felt body, and is capable of engaging and disengaging with each other, and in the mutually engaged state, the pair of abutting portions a pair of temporary joints that hold the ends abutting each other so as to form a mountain shape;
Equipped with
At least one of the pair of abutting portions has a water-soluble resin applied to at least one surface of the batt fiber layer near the loop,
A seam felt for paper manufacturing, wherein the length of the applied water-soluble resin in the length direction is 1/2 or more of the length of the abutted portion in the length direction. The papermaking seam felt according to claim 1, wherein the length in the length direction of the water-soluble resin applied to the abutting portion is 3 cm or more and 8 cm or less. The papermaking seam felt according to claim 1, wherein the abutting portion before the water-soluble resin is applied has a bending elastic modulus of 7.0 MPa or less in the length direction. Seam felt for papermaking according to any one of claims 1 to 3, wherein the water-soluble resin comprises polyvinyl alcohol, carboxymethyl cellulose, polyvinyl acetate or modified starch, or a combination thereof. The water-soluble resin contains polyvinyl alcohol,
The papermaking seam felt according to claim 4, wherein the water-soluble resin applied to the abutting portion has an areal density of 20 g/m ² or more and 40 g/m ² or less.

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