JP6475063B2 - Seam felt for papermaking - Google Patents

Description

  The present invention relates to a papermaking felt used for transporting, squeezing, drying, and the like of wet paper in a papermaking machine, and more particularly to a base fabric for a papermaking seam felt.

  In order to improve workability when attaching a felt to a paper machine, so-called seam felts are widely used. It is popular. In this type of seam felt, loops are formed at the ends in the length direction by folding back the warp yarns constituting the base fabric, and the loop holes at both ends are alternately meshed so as to align with each other. The structure which joins both ends through a core wire is common.

  Such seam felt joining is a precise manual operation. When twisted yarn is used for the warp constituting the loop, the loop does not stand upright and is inclined and the loops are difficult to mesh with each other, and the seam felt joining work becomes difficult. Therefore, monofilaments (single yarns) have been used for warps so that the loops stand upright (for example, Patent Document 1).

JP 2010-65343 A

  However, when a monofilament is used for the warp of a papermaking felt base fabric, troubles such as withdrawal of the warp yarn due to expansion and contraction and compression during use, and dropping of the bat fiber needled to the base fabric are likely to occur. In particular, when a thick monofilament is used in order to improve the strength and the void amount, such a trouble is likely to occur. When the needling is increased in order to prevent this, the warp and the weft are damaged by the needling, so that the strength of the base fabric is lowered.

  In view of such a problem, an object of the present invention is to provide a seam felt including a twisted yarn and capable of easily joining both ends of the seam felt.

  One aspect of the present invention includes a base fabric (4, 16) in which warp yarns (10, 18) and weft yarns (12) are woven together, and a bat fiber layer (6) needled to the base fabric. And a seam felt for papermaking, the ends of which can be joined to each other by a loop (8) formed by the warp, wherein the warp is twisted by 19 to 28 twists per 10 cm of three monofilaments. Including the first warp (10, 20) made of twisted yarns formed together, each monofilament has a diameter of 0.19 mm to 0.30 mm.

  According to this configuration, since the twist of the loop is suppressed despite the use of a twisted yarn advantageous for air permeability, stretchability in the length direction, and bondability between the base fabric and the bat fiber, the seam felt is suppressed. It is possible to easily join the both end portions.

  Another aspect of the present invention is characterized in that, in the above-mentioned configuration, the first warp is resin-processed so that flexibility of the loop is reduced at least in a portion constituting the loop.

  According to this configuration, the shape of the loop is maintained by the solidified resin, and the inclination of the loop composed of the twisted yarn is prevented, so that both end portions of the seam felt can be joined more easily.

  According to another aspect of the present invention, in the above configuration, the warp (18) further includes a second warp (22) made of monofilaments arranged in parallel and alternately with the first warp (20). Features. Each of the second warps is preferably adjacent to at least one corresponding first warp at both ends.

  According to this configuration, since the second warp loop supports the first warp loop so as to prevent the first warp loop from being inclined, the loop is maintained in an upright state, and both ends of the seam felt are easily Can be joined.

  Another aspect of the present invention is characterized in that, in the above-mentioned configuration, the weft is made of a monofilament having a diameter of 0.33 mm to 0.43 mm.

  According to this configuration, expansion and contraction of the seam felt in the width direction is suppressed, the dimension in the width direction is stabilized, and air permeability can be improved.

  According to another aspect of the present invention, in the above configuration, the base fabric (4, 16) is formed by weaving one layer of the weft yarns on the warp yarns (10, 18) arranged in two layers. It is characterized by being a warp double weft and single woven base fabric.

  According to this configuration, the air permeability can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the seam felt which can join easily the both ends of a seam felt can be provided, providing the advantage which uses a twisted yarn for a warp.

The perspective view of the seam felt which concerns on 1st Embodiment Photo taken from the paper surface of the base fabric according to the first embodiment Photograph of the end of the seam felt according to the first embodiment Photo taken from the paper surface of the base fabric according to the second embodiment Photograph of the end of the seam felt according to the second embodiment Photograph of base fabric according to examples ((a) Example of the present invention (b) Comparative control) Photograph of base fabric according to another example ((a) Example of the present invention (b) Comparative control)

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIGS. 1-3, the papermaking seam felt 2 which concerns on 1st Embodiment is demonstrated. The seam felt 2 is obtained by laminating a bat fiber layer 6 on a base fabric 4 by needling. The seam felt 2 is endless, but is joined by engaging a loop 8 protruding from the bat fiber layer 6 at both ends thereof and passing a core wire (not shown) through the hole of the meshed loop 8. It becomes the form. The seam felt 2 is attached to a paper machine and is used as a transport belt for paper raw materials in dewatering processes such as squeezing and pressurization.

  The base fabric 4 is formed by weaving warp double weft and single weave, that is, warp yarns 10 arranged in two upper and lower layers and weft yarns 12 arranged in one layer. The upper layer and the lower layer have the same number of warps 10. The wefts 12 are composed of upper and lower two layers of warps 10 arranged in four rows in the width direction as one weaving unit, straddling the upper layer of the upper layer warp 10 in order from the end, and then passing between the upper layer and the lower layer of the warp 10 After straddling the lower side of the lower warp 10, the warp 10 is passed between the upper and lower warps 10, and this weaving unit is repeated so that the warp 10 and the weft 12 are woven together. The weaving unit of the warp 10 and the weft 12 is not limited to this. The warp yarn 10 is folded at both ends of the base fabric 4 to form upper and lower two layers and form a loop 8.

  All the warp yarns 10 are made of twisted yarns formed by twisting three monofilaments (single yarns) at a twist number of 19 to 28 times per 10 cm. The monofilament constituting the warp 10 is made of a synthetic resin such as polyamide, polyester, polyethylene, polypropylene, polyvinyl chloride or the like. The monofilaments constituting the warp 10 have the same diameter and have a diameter of 0.19 mm or more and 0.30 mm or less. The entire warp 10 or only the loop 8 may be coated with a resin so that its flexibility is reduced and its shape is maintained. Coating with resin can be performed by a known processing method such as impregnation processing or spray processing. The warp yarns 10 extend in the length direction and are arranged at substantially equal intervals in the width direction. When the both ends of the seam felt 2 are joined to each other, the loops 8 on one end side and the loops 8 on the other end side are engaged with each other so as to be alternately arranged one by one.

  The weft 12 is composed of a single monofilament (single yarn), and its diameter is not less than 0.33 mm and not more than 0.43 mm. The monofilament constituting the weft 12 is also made of a synthetic resin such as polyamide, polyester, polyethylene, polypropylene, polyvinyl chloride or the like.

  The bat fiber layer 6 laminated on the base fabric 4 covers the upper and lower sides of the base fabric 4 with short fibers formed into a sheet shape, and performs needling by repeatedly piercing with needles arranged in a sword mountain shape from the upper and lower sides. It is formed by entanglement with the cloth 4 and other short fibers. The short fibers constituting the batt fiber layer 6 are made of synthetic resin such as polyamide (nylon), polyester, polyethylene, polypropylene, polyvinyl chloride and the like. As the short fiber, a core-sheath composite fiber composed of a core part and a sheath part covering the core part may be used. For example, the surface of the seam felt 2 may be smoothed by using a material having a melting point lower than that of the core for the sheath and performing heat treatment after needling. Loops 8 protrude from both ends of the bat fiber layer 6 in the length direction.

  In such a seam felt 2, a twisted yarn is used for the warp yarn 10, and thus the warp yarn 10 and the short fibers of the batt fiber layer 6 are entangled well. Therefore, even if the seam felt 2 is attached to the paper machine as a transport belt and stretched in the length direction (wet paper transport direction), or pressed up and down for wet paper squeezing, the warp 10 is prevented from coming out and the short fibers of the bat fiber layer 6 are prevented from falling off.

  A twisted yarn obtained by twisting three monofilaments has lower flatness and higher elasticity than a twisted yarn obtained by twisting two monofilaments. Moreover, since each monofilament is thicker than the twisted yarn of the same thickness which twisted four monofilaments, the fall of intensity | strength is suppressed even if damaged by needling. Further, a twisted yarn obtained by twisting three monofilaments is superior in air permeability as compared with a twisted yarn obtained by twisting two or three monofilament yarns.

  Further, if the number of twists of the three monofilaments used for the warp yarn 10 is 18 times or less per 10 cm, the yarn tends to be flattened, and if it is 29 times or more, the yarn becomes too hard and the force to return the twist becomes large. Thus, the production efficiency is deteriorated. Further, if the number of twists is 28 times or less, the force in the direction in which the twist returns can be suppressed, so that the loop 8 can be prevented from being inclined with respect to the extending direction of the warp yarn 10. Therefore, the twist number of the warp yarn 10 is appropriately 19 times or more and 28 times or less per 10 cm. Furthermore, when the whole warp 10 or the loop 8 part is coated with resin, the loop 8 can be prevented from being inclined with respect to the extending direction of the warp 10. As described above, by suppressing or preventing the loop 8 from being inclined, the loops 8 at both ends of the seam felt 2 can be easily engaged with each other, and the joining work of both ends of the seam felt 2 is facilitated.

  When the warp 10 is made of a twisted yarn obtained by twisting three monofilaments having a diameter of 0.19 mm or more and 0.30 mm or less, the warp 10 is easily crimped, and the protrusion height in the thickness direction of the weft 12 by the crimp Is suppressed. Therefore, the seam felt 2 can suppress the surface from being marked and the shape of the base fabric 4 being marked on the manufactured paper, and the thickness etc. can be reduced even when pressed in the thickness direction for squeezing. Less change in physical properties.

  Since the weft 12 is composed of one monofilament, the amount of expansion and contraction in the width direction of the seam felt 2 is small. Since the dimension in the width direction is stable, it is suitable for use as a transport belt.

  The warp yarn 10 is made of a twisted yarn obtained by twisting three monofilaments having a diameter of 0.19 mm or more and 0.30 mm or less, and the weft 12 is made of a monofilament having a diameter of 0.33 mm or more and 0.43 mm or less. The base fabric 4 can be woven so as to have an appropriate gap, and air permeability is improved.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. About the structure similar to 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected and description of a structure and an effect is abbreviate | omitted. The seam felt 14 according to the second embodiment is different from the first embodiment in that the warp 18 of the base fabric 16 includes a first warp 20 made of twisted yarn and a second warp 22 made of monofilament.

  The first warp 20 has the same configuration as the warp 10 of the first embodiment. That is, the first warp 20 is composed of a twisted yarn formed by twisting three monofilaments (single yarn) at a twist number of 19 to 28 times per 10 cm, and the monofilament is 0.19 mm or more and 0.30 mm or less. The synthetic resin such as polyamide, polyester, polyethylene, polypropylene, and polyvinyl chloride is used as a material. The first warps 20 are all twisted in the same direction.

  The second warp 22 is made of a monofilament (single yarn). The monofilament constituting the second warp 22 preferably has the same diameter as the thickness of the twist of the first warp 20, and is made of synthetic resin such as polyamide, polyester, polyethylene, polypropylene, polyvinyl chloride or the like.

  50% of the warp 18 is the first warp 20, and the remaining 50% is the second warp 22. The first warp 20 and the second warp 22 extend in the length direction and are alternately arranged in the width direction. The first warp 20 and the second warp 22 are folded back to form the loop 8. The first warps 20 are easily inclined in the same direction by being twisted in the same direction. Therefore, at least in the part forming the loop 8, one first warp 20 and one second warp 22 on the side on which the first warp 20 is inclined are adjacent to each other to form a set of loops 8. The other adjacent loops 8 are spaced from each other. Note that the second warp 22 may be brought close to or adjacent to the first warp 20 on the side to be combined, so that one set of loops 8 is easily formed. When the both ends of the seam felt 14 are joined to each other, the loops 8 on one end side and the loops 8 on the other end side are engaged with each other so as to be alternately arranged one by one.

  The loop 8 of the first warp 20 made of twisted yarn tends to be inclined with respect to the extending direction of the first warp yarn 20, but the loop 8 of the second warp 22 made of monofilament is maintained in an upright state. Therefore, the loop 8 of the second warp 22 made of monofilament supports the loop 8 of the first warp 20 made of adjacent twisted yarn so as not to tilt. Accordingly, the pair of loops 8 is maintained in an upright state, and the loops 8 at both ends of the seam felt 14 can be easily engaged with each other, and the joining work of both ends of the seam felt 14 is facilitated.

  FIG. 6 is a photograph of the base fabric in a cross section orthogonal to the width direction. Warp yarns extend to the left and right of the paper surface, and weft yarns extend in a direction perpendicular to the paper surface. Photo (a) is a base fabric according to an embodiment of the present invention. The weft is composed of a monofilament having a diameter of 0.35 mm, and the warp is twisted 26 times per 10 cm of three monofilaments having a diameter of 0.25 mm. It consists of a number of twisted yarns. Photo (b) is a base fabric prepared as a comparative control, and the weft is composed of a monofilament having a diameter of 0.35 mm as in the photo (a), but the warp is composed of three monofilaments having a diameter of 0.29 mm. Made of twisted yarn. As can be seen from FIG. 6, the ease of crimping varies depending on the diameters of the monofilaments constituting the warp. In photo (a), since the crimp is large, the protruding height in the thickness direction of the weft is small, whereas in photo (b), since the crimp is small, the protruding height in the thickness direction of the weft is large. Therefore, the base fabric according to the present invention is difficult to mark the shape of the base fabric on the paper to be manufactured, and the amount of deformation when the vertical compressive force is applied is small.

  FIG. 7 compares an embodiment in which the yarn diameter is larger than that of the embodiment shown in FIG. Photo (a) is a base fabric according to an embodiment of the present invention. The weft is composed of a monofilament having a diameter of 0.43 mm, and the warp is twisted 25 times per 10 cm of three monofilaments having a diameter of 0.28 mm. It consists of a number of twisted yarns. Photo (b) is a base fabric prepared as a comparative control, and the weft is composed of a monofilament having a diameter of 0.43 mm as in the photo (a), but the warp is composed of three monofilaments having a diameter of 0.35 mm. Made of twisted yarn. Similar to the embodiment shown in FIG. 6, the embodiment according to the present invention is more easily crimped, so that the shape of the base fabric is hard to be marked on the manufactured paper, and when the compression force in the vertical direction is received. Small deformation.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified.

2,14 ... Seam felt, 4,16 ... Base fabric, 6 ... Batt fiber layer, 8 ... Loop, 10,18 ... War, 12 ... Weft, 20 ... 1st warp, 22 ... 2nd warp

Claims (6)

A seam felt for papermaking which has a base fabric in which warps and wefts are woven together, and a bat fiber layer that is needled to the base fabric, and is capable of joining ends to each other by a loop formed by the warp. There,
The warp includes a first warp composed of twisted three monofilaments at a twist number of 19 to 28 times per 10 cm, and each monofilament has a diameter of 0.19 mm to 0.30 mm. A seam felt for papermaking, characterized by   2. The seam felt for papermaking according to claim 1, wherein the first warp is processed with resin so that flexibility of the loop is reduced at least in a portion constituting the loop.   The papermaking seam felt according to claim 1 or 2, wherein the warp further includes a second warp made of monofilaments arranged in parallel and alternately with the first warp.   4. The papermaking seam felt according to claim 3, wherein each of the second warps is adjacent to the corresponding first warp at least at both ends.   The seam felt for papermaking according to any one of claims 1 to 4, wherein the weft is made of a monofilament having a diameter of 0.33 mm to 0.43 mm.   The base fabric is a warp double weft single woven base fabric formed by weaving one layer of the wefts on the warp yarns arranged in two upper and lower layers. A seam felt for papermaking as described in any of the above.