JP2004169215A - Felt with seam for papermaking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a felt with seams for papermaking use suppressing seam marks through eliminating such an unfavorableness that the water penetrability of seam parts becomes higher than that of ground parts, and so structured as to avoid the damage of joint loops in needling attributable to reinforcing wefts. <P>SOLUTION: The felt is such one that a projection 13 is provided on an end portion 7 located on the front side of advancing direction in a paper machine so as to get into under a flap 12 provided on an end portion 6 on the rear side of the advancing direction opposite thereto, and supported with reinforcing wefts 15 and 16 entangled on a needle thread 3 on the paper-forming surface side among joint loop-forming two warps formed of favorably entangling on the fibers forming a nonwoven fiber layer 2. The plurality of reinforcing wefts are entangled on only the needle thread so that either one of them is always located on the paper-forming surface side of the needle thread in such a mode as to nip the needle thread, and crossing positions where the reinforcing wefts pass between a pair of needle threads adjoining each other in the cross direction and slip out on the opposite side are set at such intervals as to interpose a plurality of needle threads. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a felt with a seam for papermaking, wherein endless felts are alternately engaged with joining loops provided at both ends of the felt and endlessly joined through a core wire.
[0002]
[Prior art]
There is known a so-called seam felt in which an end felt is drawn into a felt run and both ends are joined to each other to be endless in order to improve the workability of inserting the felt into a paper machine. In this type of felt with a seam, as shown in FIG. 5, joining loops 104 and 105 formed by folding back the driving yarns serving as the warp yarns 102 and 103 constituting the base cloth 101 at the ends thereof are formed in the center holes of each other. Are alternately engaged with each other so that the core wire 106 passes through the common hole formed thereby, and the both ends 107 and 108 are joined.
[0003]
When manufacturing such a felt with a seam, the nonwoven fiber layer 109 is integrated by needling with the base fabric 101 in a state where the joining loops 104 and 105 are joined. By cutting the non-woven fiber layer 109 along the edge, it is finished in an end shape. At this time, the nonwoven fiber layer 109 is shifted from the center position of the joining loops 104 and 105 and cut to form a flap 110 at one end portion 107 covering the joining loops 104 and 105, and the joining loop is formed on the paper forming surface 111 side In order to prevent the flap 110 from being turned up, the end 107 provided with the flap 110 is hung so as to be located rearward in the traveling direction in the paper machine.
[0004]
In the felt with a seam configured as described above, a large external force acts on the seam portion joined by the joining loops 104 and 105 when traveling in the paper machine due to a structural difference from the ground portion. Since the entanglement of the forming fibers of the nonwoven fiber layer 109 is weakened by the cutting process, the hair loss phenomenon in which the forming fibers fall off at the nonwoven fiber layer portions near the joining loops 104 and 105 with the elapse of the use period. It occurs remarkably. The depilation of the non-woven fiber layer 109 increases the water permeability of the seam portion, and the difference in water permeability gradually increases with the soil portion where the water permeability decreases due to accumulation of dirt, so that the seam mark appears remarkably. Become like Since the seam mark deteriorates the product quality, if a seam mark exceeding the limit is recognized, it is necessary to replace the felt even in a state where the ground portion can be sufficiently used continuously.
[0005]
In order to prevent the hair loss of the nonwoven fiber layer 109 at the seam portion, the reinforcement is formed so as to be entangled with the warp yarns 102 and 103 forming the joining loops 104 and 105 and hold the nonwoven fiber layer portion near the joining loops 104 and 105. A configuration corresponding to the weft yarns 112 and 113 is known (see Patent Literature 1 and Patent Literature 2).
[0006]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2002-523652 [Patent Document 2]
Japanese Unexamined Patent Publication No. 2002-523653
[Problems to be solved by the invention]
However, the main factor for increasing the water permeability of the seam portion is the flap abrasion, and merely providing the reinforcing weft cannot sufficiently solve the problem of the increase in the water permeability of the seam portion.
[0008]
In the conventional felt with a seam (Patent Literature 1 and Patent Literature 2), the reinforcing weft is entangled with both of the two warps forming the joining loop, and the joining loop is strongly restrained at the base. In particular, since the lateral side is restricted by the reinforcing weft, the degree of freedom of movement in the width direction of the joining loop is reduced, so that the joining loop is liable to be damaged during needling. The damage of the joining loop deteriorates the engagement of the joining loop, and causes a reduction in work efficiency when the joining loop is inserted into a paper machine.
[0009]
The present invention has been devised in order to solve such disadvantages of the prior art, and a first object of the present invention is to solve the problem that the water permeability of the seam portion is higher than that of the ground portion and to reduce the seam mark. It is an object of the present invention to provide a felt with a seam that is configured so as to be able to suppress the problem. Further, a second object of the present invention is to prevent a joining loop from being damaged at the time of needling due to a reinforcing weft that holds a nonwoven fiber layer, when the reinforcing weft is arranged on a base fabric. To form a felt with seam so that
[0010]
[Means for Solving the Problems]
In order to achieve such an object, in the present invention, as shown in claim 1, the configuration of the felt with seam is provided at the end located on the front side in the traveling direction when traveling in the paper machine. Forming a protruding portion that protrudes below the flap provided at the end on the rear side in the direction, and the protruding portion is formed of a thread that is well entangled with the forming fiber of the nonwoven fiber layer, and Of the two warp yarns forming the joining loop, the reinforcing yarns were entangled with the upper yarn on the paper forming surface side.
[0011]
According to this, even if the flap is worn with the elapse of the use period, the protruding portion below the flap becomes a water flow resistance, so that a problem that the water permeability of the seam portion becomes extremely higher than that of the ground portion can be avoided. The reinforcing weft holds the protruding portion against an external force acting on the front end portion in the traveling direction, so that the inconvenience that the protruding portion is turned up can be avoided.
[0012]
In this case, when cutting the nonwoven fiber layer along the rows of the joining loops to finish the nonwoven fiber layer into an end shape after integrating the nonwoven fiber layer with the base cloth, the cut position is brought close to the center position of the joining loop. By cutting the nonwoven fiber layer obliquely in this manner, a flap is formed at one end and a protrusion is formed at the other end.
[0013]
Further, in the present invention, as described in claim 2, a plurality of reinforcing wefts formed of a yarn having good entanglement with the fibers forming the nonwoven fiber layer and holding the nonwoven fiber layer portion near the joining loop are used. The plurality of reinforcing wefts have a mode in which the upper thread of the paper forming surface side of the two warps forming the joining loop is sandwiched, and any one of the reinforcing threads is always on the paper forming surface side of the upper thread. A crossing position that is entangled only with the upper thread so as to be positioned, and passes through a pair of the upper threads adjacent to each other in the width direction and exits to the opposite side, and is set at an interval between a plurality of the upper threads. And
[0014]
According to this, since any one of the plurality of reinforcing wefts is always located on the paper forming surface side of the upper yarn, the nonwoven fiber layer on the paper forming surface side can be firmly held. And the reinforcing weft is entangled only with the upper thread, and the intersection position with the upper thread is set at an interval with a plurality of upper threads interposed, that is, the reinforcing weft jumps over the plurality of upper threads and Since they intersect, the joining loop is not strongly restrained by the reinforcing weft, and especially, the freedom of movement in the width direction is secured, so the damage of the joining loop at the time of needling is suppressed and the workability Can be improved.
[0015]
In the felt with seam, as set forth in claim 3, the reinforcing weft can have a structure composed of an aggregate of one or both of staples and filaments. According to this, since the fibers forming the nonwoven fiber layer are strongly entangled with the reinforcing weft, the surrounding nonwoven fiber layer portion can be reliably held. Further, the reinforcing weft itself serves as a resistance to water flow during wet paper web dewatering, thereby suppressing an increase in water permeability of the seam portion.
[0016]
In addition, as the yarn composed of the staples and filaments, a multifilament yarn obtained by twisting long fibers, a twisted yarn obtained by twisting monofilaments, a spun yarn obtained by spinning short fibers, and a warp yarn in a heat forming process of a base fabric. A twisted yarn obtained by twisting a melted yarn and an appropriate yarn such as a monofilament, which are melted and adhered together, a fluffed twisted yarn in which a large number of short fibers are densely arranged around a core yarn around the core yarn, or a twisted yarn. Paired twisted yarns are preferred.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0018]
FIG. 1 is a longitudinal sectional view of a seamed felt according to the present invention. The felt with seam is obtained by laminating and integrating a nonwoven fiber layer 2 on a base fabric 1. The base fabric 1 has a double-woven fabric structure in which a pair of warps 3 and 4 is entangled with a weft yarn 5. The joining loops 8 and 9 are formed at both ends 6 and 7 by folding back the driving yarns that become the warp yarns 3 and 4. The common holes formed by being alternately engaged with each other so that their center holes are aligned with each other. By inserting the joining core wire 10 in the width direction, both ends 6.7 are joined.
[0019]
This felt with a seam is finished by cutting the nonwoven fiber layer 2 into an end shape after the nonwoven fiber layer 2 is integrated with the base fabric 1 by needling. At this time, a flap 12 is formed at one end 6 by cutting diagonally from the paper forming surface 11 toward the center position of the joining loops 8 and 9, and the other end 7 is formed by the joining loop 9. A protruding portion 13 is formed in a region on the forming surface 11 side so as to protrude below the flap 12. As a result, even if the flap 12 is worn, the protruding portion 13 below the flap 12 becomes a water flow resistance, so that a problem that the water permeability of the seam portion becomes extremely higher than that of the ground portion can be avoided.
[0020]
The end portions 6 and 7 are formed of a plurality of warps 3 and 4 that form the joining loops 8 and 9 and that are entangled with the upper yarn 3 on the paper forming surface side and hold a nonwoven fiber layer portion in the vicinity. Reinforcing wefts 15 to 18 are provided. The reinforcing wefts 15 to 18 are yarns having good entanglement of the forming fibers of the nonwoven fiber layer 2, for example, one or both of staples and filaments. In addition to the function of holding, it also has a function of suppressing the rise in water permeability of the seam portion by itself as a water flow resistance during wet paper dewatering.
[0021]
In the felt with seam, the end 6 provided with the flap 12 is located on the rear side in the traveling direction when traveling in the paper machine, and the end 7 on the opposite side is located on the front side in the traveling direction. Hanged on. At the end 7 located on the front side in the traveling direction, the reinforcing wefts 15 and 16 firmly hold the protruding portion 13 against external force acting when traveling in the paper machine, thereby suppressing the protruding portion 13 from being turned up. Also at the end 6 located on the rear side in the traveling direction, the reinforcing wefts 17 and 18 firmly hold the flap 12 and the surrounding nonwoven fiber layer portion, thereby suppressing hair loss of the nonwoven fiber layer 2.
[0022]
FIG. 2 is a perspective view showing an end portion of the felt with seam shown in FIG. At the end 7 located on the front side in the traveling direction, the reinforcing wefts 15 and 16 sandwich the upper thread 3 of the two warps 3 and 4 forming the joining loop 9 on the paper forming surface side, and one of the two warps 3 and 4 forms one. Only the upper thread 3 is entangled so as to always be located closer to the paper forming surface 11 than the upper thread 3. Thereby, the nonwoven fiber layer portion on the paper forming surface 11 side is firmly held by the reinforcing wefts 15 and 16, so that the hair removal of the nonwoven fiber layer 2 can be surely suppressed.
[0023]
FIG. 3 is a schematic cross-sectional view in the width direction showing the weaving state of the reinforcing wefts shown in FIG. 1. Here, the intersection positions where the reinforcing wefts 15 and 16 pass through the pair of adjacent upper yarns 3 in the width direction and exit to the opposite side are set at intervals with a plurality of upper yarns 3 interposed therebetween. That is, the reinforcing wefts 15 and 16 jump over the plurality of upper threads 3 and are entangled with the upper thread 3. In particular, here, the two reinforcing wefts 15 and 16 sandwiching the upper thread 3 are woven so that the upper and lower turns alternately at the intersection position, and are alternately positioned on the paper forming surface 11 side of the upper thread 3. Thereby, the joining loop 9 is not strongly restrained, and particularly, the degree of freedom of movement in the width direction of the joining loop 9 is increased, so that the joining loop 9 can be prevented from being damaged during needling. The interval D between the intersections of the reinforcing wefts 15 and 16 with the upper thread 3 may be appropriately determined according to the required conditions and the like, and may be, for example, 5 cm to 50 cm.
[0024]
FIG. 4 is a schematic cross-sectional view in the width direction showing another aspect of the weaving state of the reinforcing wefts shown in FIG. 1. This shows an example in which the intersecting position of the reinforcing weft 15 with respect to the upper thread 3 and the intersecting position of the reinforcing weft 16 with respect to the upper thread 3 are shifted from each other. In (A), there is one upper thread 3 between the crossing position of the reinforcing weft 15 and the crossing position of the reinforcing weft 16, and in (B), the crossing position of the reinforcing weft 15 and the reinforcing weft 16 are shown. There are a plurality of upper yarns 3 between the intersection positions. In (A), since the upper thread 3 between the intersections of the reinforcing wefts 15 and 16 is regulated on both sides by the reinforcing wefts 15 and 16, the degree of freedom of movement of the joining loop 9 becomes extremely low. At the time of needling, there is a possibility that the joining loop 9 is severely damaged, causing scuffing or breakage of the loop, thereby deteriorating the workability. In (B), the freedom of movement of the joining loop 9 is improved as compared with (A), and the joining loop 9 is hardly damaged. Compared to these examples, in a configuration in which the intersection position of the reinforcing weft 15 and the intersection position of the reinforcing weft 16 match as shown in FIG. 3, the degree of freedom of movement of the joining loop 9 is greatly improved, which is the most desirable. .
[0025]
In the present embodiment, an example has been described in which two reinforcing wefts are disposed at each end, but a configuration in which three or more reinforcing wefts are disposed is also possible. In this case, another reinforcing weft may be woven parallel to the sides of the reinforcing wefts 15 and 16 and the reinforcing wefts 17 and 18.
[0026]
【The invention's effect】
As described above, according to the present invention, even if the flap wears out with the elapse of the use period, the protrusion formed at the front end in the traveling direction so as to go under the flap serves as a water flow resistance. In order to suppress the rise in water permeability of the seam part, it is possible to eliminate the problem that the service life is shortened and limited due to the seam mark by suppressing the seam mark, which has a remarkable effect on extending the life of the felt with seam . In addition, since the protruding portion is held by the reinforcing weft, it is possible to avoid the problem that the protruding portion is turned up by the external force and protrudes toward the paper forming surface side, so that a great effect can be obtained in wiping out the adverse effect on the operation.
[0027]
In addition, since the reinforcing weft is always located on the paper forming surface side of the upper yarn, the reinforcing weft can firmly hold the nonwoven fiber layer on the paper forming surface side, and the joining loop is formed by the reinforcing weft. Since the joint loop is not strongly restrained and particularly has a high degree of freedom of movement in the width direction of the joining loop, damage to the joining loop during needling can be suppressed, and the workability of the joining loop can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a seamed felt according to the present invention.
FIG. 2 is a perspective view showing an end portion of the felt with seam shown in FIG.
FIG. 3 is a schematic cross-sectional view in the width direction showing a weaving state of the reinforcing weft shown in FIG. 1;
FIG. 4 is a schematic cross-sectional view in the width direction showing another aspect of the weaving state of the reinforcing weft shown in FIG. 1;
FIG. 5 is a longitudinal sectional view of a conventional felt with seam.
[Explanation of symbols]
1 base cloth 2 non-woven fiber layer 3 warp (upper thread)
4 Warp 5 Weft 6 ・ 7 End 8.9 Joining Loop 11 Paper Forming Surface 12 Flap 13 Projection 15 ・ 16 ・ 17 ・ 18 Reinforcing Weft

Claims (3)

At the end located on the front side in the traveling direction when traveling in the paper machine, a projecting portion is formed which protrudes under the flap provided at the opposite end on the rear side in the traveling direction, which is opposite to this. The portion is formed of a yarn that is well entangled with the forming fiber of the nonwoven fiber layer, and is held by a reinforcing weft that is entangled with the upper yarn of the paper forming surface side of the two warps that form the joining loop. Felt with seam characterized by the following. The nonwoven fiber layer has a plurality of reinforcing wefts formed of yarn having good entanglement with the forming fibers and holding a nonwoven fiber layer portion near the joining loop, and the plurality of reinforcing wefts are In a mode in which the upper yarn of the paper forming surface side of the two warps forming the joining loop is sandwiched, only one of the upper yarns is entangled with the upper yarn so that it is always located on the paper forming surface side of the upper yarn, and the width thereof is A crossed position passing through a pair of the upper yarns adjacent in the direction and coming out to the opposite side is set at an interval with a plurality of the upper yarns interposed therebetween. The seamed felt according to claim 1 or 2, wherein the reinforcing weft is made of an aggregate of one or both of staples and filaments.

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