JP4204022B2 - Joint structure of the joint of fabric - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure of a joint portion where both end portions of an end-woven fabric are joined by weaving, and particularly to a joint structure of a joint portion of a papermaking fabric.
[0002]
[Prior art]
Conventionally, fabrics are used endlessly joined.
For example, a conveyor belt or a paper fabric for papermaking.
Various methods are used for joining to the endless, such as a sewing machine or a method of welding by overlapping, depending on the application, but the joint is required to have the same structure and smoothness as the other parts. In this case, a joining method using a woven joint is adopted.
In particular, in the case of a papermaking fabric, it is indispensable to join by a woven joint since it is not allowed to generate a mark on the paper even in the joint portion.
The quality of the joints has a significant effect on the quality of the paper.
[0003]
Next, the method of weaving will be briefly described.
First, remove the wefts at both ends of the woven fabric to form a part consisting only of warp, make the parts consisting only of the warp at both ends opposite, and consist only of the wefts created by removing the previously prepared warp A weaving piece is installed, the wefts of this weaving piece are opened according to the weaving structure, and the warps of only the warps at both ends are alternately inserted into the opening from both sides, and the warps at both ends are abutted.
The positions where the warp yarns are abutted are dispersed in the warp direction, that is, in the woven piece, in order to improve smoothness and joint strength.
[0004]
Currently, the weaving operation is almost always performed by an automatic weaving machine, and the weft opening is performed by a jacquard system.
By the way, since the joint portion is a joint portion, not only the surface smoothness but naturally sufficient joint strength is required.
In order to improve the bonding strength, measures have been taken by increasing the length of the bonded portion, that is, the width of the woven piece, and widening the width at which the warp abutment positions are dispersed.
In that case, the maximum width at which the width of the weaving piece can be increased is determined by the number of jars in the jacquard system. This is because the number of folds is the number of wefts of the woven joint piece that can be opened.
[0005]
However, due to recent demands for improving paper quality, the mesh for papermaking has become very fine, and the number of wefts per unit length of woven fabrics has increased due to the increase in the number of wefts with triple structure. Even if all the rivets of the system are used, there is a problem that a sufficient width of the joint cannot be secured, and the bonding strength is weakened.
There has been a strong demand to improve the joint strength without increasing the width of the joint.
[0006]
[Problems to be solved by the invention]
In view of the above problems, the present invention intends to provide a bonded structure and a bonding method of a bonded portion of a woven fabric capable of improving the bonding strength without increasing the width of a woven joint.
[0007]
According to the present invention, in the joint structure of the joint portion where the both ends of the end-woven fabric are joined by weaving, the butting position of a pair of warp yarns weaving and wetting between the wefts from both sides at the joint portion is determined. It is formed by concentrating on both end portions in the warp direction, or both end portions and the central portion, and in the concentrated portion, the butt position is dispersed in the warp direction , and the butt position of both end portions is the warp direction of the joint portion. one third or less of both end portions in connective tissue of the joint of the fabric, characterized in that the. "relates.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, warp means a yarn that is abutted from both sides at the joint, and weft means a yarn that intersects with the warp, and is not limited to warp or weft during weaving or use. Absent.
Also, various known ways of matching can be employed as the way of matching warps.
For example, a method of inserting warp end portions from both sides between the same wefts, inserting between adjacent wefts with one weft in between, or intersecting several wefts can be employed.
[0009]
A feature of the present invention is that, in the width of the woven joint, that is, the width of the woven piece, the butt positions of the ends of the pair of warps that are woven between the wefts of the woven piece from both sides are matched to both ends in the warp direction. A large number of portions or both end portions and the central portion are formed. Of course, when concentrated on both end portions or both end portions and the central portion, the portions have a certain width, and the butted positions are dispersed therein.
Although it is not always sufficient to clarify the academic reason why the bonding strength is improved in the above configuration, the present inventor thinks as follows in view of the effect of repeated reproduction.
[0010]
An example will be described.
First, the present inventor relates to the joint strength that is the sum of the strength at which a pair of warps that are abutted at the joint portion come out. And since the position where a pair of warp is abutted is dispersed in the joined part, the strength of each pair of warp varies.
[0011]
For example, when the weaving width is 60 mm, warp yarns woven from both sides are dispersed and butted within the range of 60 mm, but a pair of butted warps are in the middle of the weaving width, that is, The strength that contributes to the joining strength of a pair of warp yarns when they are abutted at 30 mm from both ends of the weaving width is twice the strength when one warp is pulled out from a 30 mm fabric structure. is there.
Further, the strength that contributes to the bonding strength of a pair of warps when a pair of warped warps are butted at a position 20 mm from one end of the weaving width and 40 mm from the other end is 20 mm. This is the total of the strength when one warp is pulled out from the woven fabric texture and the strength when one warp is pulled out from the 40 mm woven fabric texture.
That is, the strength in the case of matching in the middle is different from the strength in the case of matching at the positions of 20 mm and 40 mm.
[0012]
And the strength becomes large in the vicinity of the end portion of the woven joint width at the abutting position. To be a little more precise, the strength gradually decreases or goes sideways toward the end centering on the case where they meet in the middle, and increases toward the rear end to increase to the maximum strength at the end. It is.
Therefore, if the pair of warps that are butted together at a position where the strength is high is increased, the joint strength of the joint portion is improved as a result.
That is, the butting position is concentrated on both end sides or both end portions and the central portion.
[0013]
The position where the area to be concentrated depends on the weaving structure and weaving width, so it cannot be generally stated. In each case, measure the strength when a pair of warps are abutted at each position. Will be estimated.
However, it has been found from a plurality of experimental results that if the weaving width is concentrated within one-third of both sides divided into three, a strength almost equal to or higher than that obtained when the whole is dispersed is obtained.
[0014]
【Example】
Next, the present invention will be specifically described based on examples.
EXAMPLE A papermaking woven fabric for papermaking was used, and the weaving joint width was set to 80 mm, and the warp butting positions were concentrated on one quarter of both ends of the weaving joint width.
The construction of the papermaking fabric is a fabric generally called a 2.5-fold weaving, in which the warp is a single weft and a double structure and the upper weft is twice as many as the lower weft, and the warp has a diameter of 0.17 mm. 155 polyester monofilaments are arranged in 1 inch, 40 0.13 mm polyester monofilaments are placed in 1 inch on the upper weft, 40 0.17 mm polyester monofilaments are placed in 1 inch, and 0.0. This is a woven fabric in which 40 monofilaments made of 22 mm polyester are arranged in 1 inch.
The breaking strength of the joint per 1 cm width was 61.3 kg.
[0015]
Comparative Example Using the same woven fabric as in Example, the weaving width was 80 mm, and the warp butt position was uniformly dispersed throughout the weaving width.
The breaking strength of the joint per 1 cm width was 55.2 kg.
From the above results, it can be seen that the bonding strength of the example is about 10% higher than that of the comparative example.
FIG. 1 is a graph showing a warp strength distribution in a pair at a warp butt position.
The vertical axis represents strength, and the horizontal axis represents a weaving width assumed to be 80 mm with a scale of 10 mm.
First, the strength at the time when the warp was pulled out from the fabric structures having lengths of 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, and 80 mm of the fabrics used in Examples and Comparative Examples was measured.
Then, for example, the intensity at the abutting position 20 mm from one end, that is, the intensity at points A and A ′ in the graph is plotted as a sum of the measured 20 mm intensity and 60 mm intensity.
[0016]
From this graph, the strength increases when the pair of warps are butted in the middle, that is, toward the end portion, centering on the point B in the graph, gradually decreases toward the rear end portion, and the endmost portion is maximum. It can be understood that the strength is.
Further, the overall strength of the joint width can be considered by the area of the integrated value of the graph.
Therefore, the strength when the warp butt position is uniformly dispersed and joined to the entire weaving width can be considered as the area surrounded by the point CEGD, and is concentrated on one quarter of both ends of the weaving width. Thus, the strength when bonded can be considered as four times the area surrounded by the point CEFA.
[0017]
When this area value is compared, the area that is four times the area surrounded by the point CEFA is increased by about 10% with respect to the area surrounded by the point CEGD. You can see that they match.
From the above, it is presumed that the above idea of the present inventor is correct.
[0018]
【The invention's effect】
Since the present invention is configured as described above, there is an effect that the bonding strength can be improved without increasing the width of the woven joint.
[Brief description of the drawings]
FIG. 1 is a graph showing a warp strength distribution in a pair.

Claims (1)

In the joint structure of the joint part where both ends of the end-woven fabric are joined by weaving, the butt position of a pair of warp weaving and butting between the wefts from both sides at the joint part, both end parts in the warp direction of the joint part Alternatively, the butt positions are dispersed in the warp direction in the concentrated portions, and the butt positions are dispersed in the warp direction , and the butt positions of both ends are one third of the warp direction of the joint. A bonded structure of a bonded portion of a woven fabric, characterized in that it is the following both end portions .

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