JP4279977B2 - New perforated nonwoven fabric manufacturing belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt for manufacturing a perforated nonwoven fabric having a regular perforated pattern. More specifically, the fibers of a fiber web are entangled and rearranged by a water jet treatment such as a high-pressure columnar water stream. The present invention relates to a perforated nonwoven fabric manufacturing belt for supporting and transporting a fiber web, which is used when a spunlace (hereinafter abbreviated as SL) nonwoven fabric having a perforated pattern is manufactured.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a belt for manufacturing an open nonwoven fabric in which a knuckle portion is formed on the belt surface in order to manufacture an open nonwoven fabric having an aperture pattern is known. For example, Japanese Patent Publication No. 44-23909 discloses a so-called mesh support in which at least one of the graticules is bent in a knuckle state. Japanese Patent Publication No. 7-91755 discloses a support for producing a perforated nonwoven fabric in which a descending portion on the surface of a mesh substrate woven with a graticule wire is plated to provide a semi-elliptical spherical or semi-spherical protrusion. Is disclosed.
[0003]
[Problems to be solved by the invention]
However, the opening shape formed in these prior arts is circular or elliptical. In the elliptical opening shape, the machine longitudinal direction (MD direction) has a long diameter, and the machine width direction (CD direction). Is generally a minor axis. This is because the opening is usually formed by a warp knuckle part (convex part) formed by warping of the warp. In weaving a woven fabric, the weft is lead-punched during weaving as compared to the warp tension. This is because the lead pressure is high, and as a result, at the intersection (texture point) between the warp and the weft of the woven fabric, the warp mainly has a weaving characteristic that bends and forms a warp knuckle.
[0004]
Due to these weaving characteristics, when an SL-perforated nonwoven fabric having an opening pattern is produced with a conventional perforated nonwoven fabric production belt in which the warp is arranged in the MD direction and the weft is arranged in the CD direction, an elliptical shape formed by the warp knuckle The aperture portion has a major axis in the MD direction, that is, the obtained apertured nonwoven fabric is wound into a roll in a state in which a large number of regular elongated apertures are formed in the longitudinal direction, whereby a nonwoven fabric roll is produced. The width of this nonwoven fabric roll is roughly equivalent to the width of the perforated nonwoven fabric manufacturing belt, and this is further appropriately cut based on the product application, user-specified width, etc., with a roll or slitter etc. to the specified width, The non-woven fabric roll for shipping obtained by dividing is packaged and shipped as a perforated non-woven fabric roll product. The user of the shipping destination, for example, the surface material, the covering material, the wipe of the absorbent hygiene article, etc. For use in product applications such as materials, wall interior materials, filter materials, etc., this perforated nonwoven fabric roll product is rolled back and used by cutting to a predetermined size as appropriate. In this case, as described above, the opening pattern formed in the open nonwoven fabric forms a large number of regular elongated openings in the longitudinal direction of the nonwoven fabric. It is convenient when an elliptical aperture part that forms a major axis in the MD direction) is desired, but on the contrary, when an elliptical aperture part that forms a major axis in the width direction of the nonwoven fabric (CD direction) is required, The effort to join a plurality of perforated nonwoven fabrics in the width direction is required.
[0005]
In the case where the present invention requires an elliptical aperture that forms a major axis in the width direction (CD direction) of the nonwoven fabric as described above, in order to eliminate the need to join a plurality of nonwoven fabrics, in the width direction of the nonwoven fabric, An object of the present invention is to provide a novel perforated nonwoven fabric manufacturing belt for manufacturing a perforated nonwoven fabric having an elliptical perforated portion that continuously forms a major axis.
[0006]
[Means for Solving the Problems]
In the present invention, a warp knuckle portion where warps are bent at least at the intersection of the warps and the wefts is formed on the surface of the woven fabric in which the warps and the wefts are woven, and the surface height difference A between the warps and the wefts on the surface is A ≧ (warp A belt for manufacturing an apertured non-woven fabric comprising a woven joint of end-shaped plastic fabrics, wherein the weft yarn crimp height difference B is B ≧ (weft wire diameter / 2). In which the weft is arranged in the MD direction, and a warp knuckle portion is formed in the CD direction to form an elliptical opening having a major axis in the CD direction of the nonwoven fabric. The above-described problems are solved by using a belt for producing perforated nonwoven fabric. The perforated nonwoven fabric manufacturing belt is an endless belt composed of a single or a plurality of end plastic fabrics, and ends of the end plastic fabrics woven together with wefts. Features. Further , the above-mentioned plastic woven fabric is a mesh woven fabric composed of plastic monofilament warp and weft having a wire diameter of 0.5 to 2.0 mm, and the warp and weft have the same wire diameter. This is a perforated nonwoven fabric manufacturing belt.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on illustrated examples. FIG. 1 is a cross-sectional view of a crossing point (texture point) of warp yarns 2 and weft yarns 3 in the width direction of a novel perforated nonwoven fabric manufacturing belt 1 of the present invention. FIG. 2 is a cross-sectional view in the longitudinal direction of the perforated nonwoven fabric manufacturing belt 1. FIG. 3 is a cross-sectional view of the joint portion in the longitudinal direction for explaining the joint portion between the end portions of the plastic fabric 9. FIG. 4 is a plan view of the perforated nonwoven fabric manufacturing belt 1. Both are made of a plastic mesh fabric having a warp density of 12 yarns / inch and a weft density of 10 yarns / inch, in which polyester monofilament warp yarns and weft yarns are woven into a plain weave.
[0008]
As shown in FIG. 5, the normal plastic fabric 10 has a straight shape in which the weft 3 is not crimped and the warp 2 is bent at the intersection 4 with the weft 3 to form a warp knuckle portion 5. Yes. A conventional manufacturing method is a method in which both ends of such a plastic fabric, that is, a plastic fabric in which the warp is arranged in the MD direction and the weft is arranged in the CD direction, are joined together to form an endless belt and a perforated nonwoven fabric manufacturing belt. However, in the present invention, as illustrated in FIG. 4, the warp 2 is arranged in the CD direction (arrow C) and the weft 3 is arranged in the MD direction (arrow M). With such an arrangement, the warp knuckle portion 5 is formed by the warp 2 in the CD direction, and the fibers of the fiber web on the belt are entangled with each other by a water jet process such as a high-pressure columnar water flow by a known SL method. In this case, a large number of elliptical apertures having a major axis in the CD direction can be formed by rearrangement. FIG. 6 shows a plan view of an apertured nonwoven fabric manufactured by a known SL method using the novel apertured nonwoven fabric manufacturing belt 1 of the present invention.
[0009]
In the present invention, the warp 2 is arranged in the CD direction (arrow C) and the weft 3 is arranged in the MD direction (arrow M). That is, the longitudinal direction of a normal plastic fabric is transverse to the belt width direction. Depending on the length of the belt, it is composed of a single or plural end plastic fabrics, the ends of the end plastic fabrics are woven together with wefts, and an endless belt. It is necessary to. However, when weaving the ends of the end plastic fabric with wefts, the joint joint strength is poor even if weaving if the wefts 3 are straight without crimp, as illustrated in FIG. It will be a thing.
[0010]
Therefore, in the present invention, as shown in FIG. 1, the surface height difference A7 between the warp 2 and the weft 3 on the surface of the plastic fabric is A ≧ (warp wire diameter / 2), and the crimp height difference B8 of the weft 3 is It is preferable to satisfy B ≧ (weft wire diameter / 2). When the surface height difference A is A <(warp yarn diameter / 2), the degree of convexity of the warp knuckle portion 5 is reduced, and it becomes difficult to form the opening portion by the SL method. Further, when the weft crimp height difference B is B <(weft wire diameter / 2), the joint joint strength is inferior to the belt tension even if it is woven. The surface height difference A and the crimp height difference B can be achieved by controlling the warp tension when weaving the plastic fabric. At the time of weaving, it is preferable to control the warp tension so that the basic tension of the loom is 0.1 to 0.2 g / dtex and the lead hitting state is 1.5 to 3.5 g / dtex. The upper limit value of the crimp height difference B is B ≦ ((plastic fabric apparent thickness H−2A) / 2).
[0011]
For example, in the plastic woven fabric 10 illustrated in FIG. 5, the above-mentioned A = 1.2 mm and the above-mentioned B = 0, and the woven joint tensile strength (according to JIS1096 method) of the portion where the ends are woven together with wefts is 0.39 Kg / cm, inferior in tensile strength. Further, for example, in the plastic fabric 9 of the present invention illustrated in FIG. 1, the above-mentioned A = 0.8 mm, the above-mentioned B = 1.04 mm, and the woven portion tensile strength of the portion where the ends are woven together is 15 kg. / Cm, and has a sufficient tensile strength as a belt for manufacturing a nonwoven fabric.
[0012]
It is preferable that the above-described woven joint portion 6 does not form irregularities due to the woven joint on the belt surface. If irregularities are formed in the woven joint, a seam mark is formed on the surface of the nonwoven fabric when the nonwoven fabric is manufactured by the SL method. Normal weaving means that the wefts at both ends of the end-shaped plastic fabric are removed over a predetermined length, and a part of the warp is obtained by extending the warp obtained by removing the wefts. As a joining loop forming warp, it is folded to the plastic fabric body side (own end) and bound between warp rows to form a joining loop, and the joining loops formed at both ends are meshed and meshed With means for inserting the core wire for joining into the common hole and the warp extending in the hook shape, at both ends of the plastic fabric, one warp is inserted between the other warp rows, and the other warp is inserted into one warp row. There are known weaving means such as means for directly weaving the warp yarns at both ends, and the latter is preferred in the belt of the present invention. In the present invention, as described above, since the longitudinal direction of the plastic fabric is used sideways in the belt width direction, depending on the belt length dimension, the plastic fabric is composed of a single or plural end plastic fabrics, It is preferable that the ends of the end plastic fabric are woven together with wefts.
[0013]
In the present invention, a plain weave mesh fabric made of plastic monofilaments having the same wire diameter for the warp and the weft and a wire diameter of 0.5 to 2.0 mm is preferable. If the wire diameter is less than 0.5 mm, the degree of convexity of the warp knuckle part 5 will be reduced, and it will be difficult to form the hole part. If the wire diameter exceeds 2 mm, it is difficult to control the warp tension during weaving, and it becomes difficult to form a crimp having the above-described crimp height difference B condition on the weft. More preferably, the wire diameter is 0.8 to 1.5 mm.
[0014]
The present invention has been described above based on the illustrated embodiments. However, the present invention is not limited to such embodiments, and various modifications may be made to the specific structure within the scope of the present invention. Needless to say.
[0015]
【The invention's effect】
The perforated nonwoven fabric manufacturing belt of the present invention can produce a perforated nonwoven fabric having an elliptical perforated portion that continuously forms a major axis in the width direction of the nonwoven fabric, and the width direction (CD direction) of the nonwoven fabric. In the case where an elliptical hole forming a long diameter is required, it is possible to eliminate the need to join a plurality of nonwoven fabrics. In addition, the obtained belt for manufacturing an apertured nonwoven fabric has a sufficient woven joint tensile strength even if it is woven by wefts.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view at a crossing point of warps and wefts in the width direction of a novel perforated nonwoven fabric manufacturing belt of the present invention.
FIG. 2 is a partial cross-sectional view in the longitudinal direction of a novel perforated nonwoven fabric manufacturing belt of the present invention.
FIG. 3 is a cross-sectional view of a woven joint portion in the longitudinal direction of the novel perforated nonwoven fabric manufacturing belt of the present invention.
FIG. 4 is a partial plan view of the novel perforated nonwoven fabric manufacturing belt of the present invention.
FIG. 5 is a partial cross-sectional view at the intersection of warp and weft in the width direction of a normal plastic fabric.
FIG. 6 is a perforated nonwoven plane photograph for explaining a perforated pattern of a perforated nonwoven fabric produced using the novel perforated nonwoven fabric manufacturing belt of the present invention.
[Explanation of symbols]
1 New perforated nonwoven fabric manufacturing belt 2 Warp 3 Weft 4 Intersection of warp and weft 5 Warp knuckle 6 Weave joint 7 Plastic fabric surface height difference A
8 Weft crimp height difference B
9 Plastic Fabric 10 in the Present Invention General Plastic Fabric 11 Oval Opening Portion 12 Cut Portion 13 of Weaved Warp Opening Nonwoven Fabric 14 with Oval Opening Portion Apparent Thickness H of Plastic Fabric

Claims (3)

A warp knuckle portion where warps are bent at least at the intersection of the warps and wefts is formed on the surface of the woven fabric in which the warps and wefts are woven, and the surface height difference A between the warps and the wefts on the surface is A ≧ (warp wire diameter / 2 ), And the weft yarn crimp height difference B is B ≧ (weft wire diameter / 2) . For producing a novel perforated nonwoven fabric, wherein the wefts are arranged in the MD direction, and a warp knuckle part is formed in the CD direction to form an elliptical perforated part having a major axis in the CD direction of the nonwoven fabric belt.   The perforated nonwoven fabric manufacturing belt is composed of a single or a plurality of end plastic woven fabrics, and the end portions of the end plastic woven fabrics are endless belts woven with wefts. The novel perforated nonwoven fabric manufacturing belt according to claim 1. Plastic fabric, plastic monofilament wire diameter 0.5~2.0mm warp consists weft, according to claim 1-2 where and該経yarn and weft threads, characterized in that a mesh fabric is the same wire diameter A novel belt for producing perforated nonwoven fabrics according to any one of the above.

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