JPS61215766A - Connection of nonwoven fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Fields The present invention provides an extremely convenient way to connect nonwoven fabrics to each other when using nonwoven fabrics having a specific structure for various uses such as civil engineering sheets, agricultural sheets, and rice cakes. The present invention relates to a method for connecting nonwoven fabrics.

(b) Conventional technology In recent years, the development of nonwoven fabrics has been remarkable, and raw material fibers.

Depending on the manufacturing method and other characteristics, they are used in a wide range of applications such as clothing, packaging, sanitary materials, agriculture, and civil engineering. In particular, conventional textiles are used in applications that cover wide areas, such as civil engineering sheets used in the improvement and reclamation of vast lands with sides of several hundred meters, or agricultural sheets used in greenhouse cultivation, etc. Instead, nonwoven fabrics made of synthetic fibers such as polyester fibers and polypropylene fibers have come to be used.

On the other hand, in order to cover a wide area such as the one mentioned above, sheets as wide as possible are required, but the equipment for manufacturing them is practically only 5 m wide.
The width is the limit, and therefore it is necessary to connect and use a large number of nonwoven fabrics. Connection methods in this case include simply overlapping the ends of the nonwoven fabrics to be connected, sewing them together with a sewing machine, gluing them with pressure-sensitive or heat-sensitive adhesive, or forming eyelets to form strings, robes, etc. There are methods such as tying them together, but in any case, it is extremely difficult to connect them to a sheet over a vast area in advance at a factory, etc., and then transport it to the construction site. Therefore, it is desirable to connect these nonwoven fabrics at the actual construction site, but whether it is done by sewing with a sewing machine or joining with adhesive, it is necessary to bring in the necessary equipment, and depending on the location conditions of the construction site, These operations themselves may be difficult, and are not necessarily easy. Therefore, in practice, especially for civil engineering sheets, it is recommended to simply overlap the ends of the nonwoven fabric to be connected. Although it is widely used, the overlapping parts tend to separate due to topographical conditions such as undulations of the construction site or the load from embankments, so the ends are made larger and the width is 30al1.
The above are also being superimposed. However, in a vast laying area, if the overlapping portion is wide, the nonwoven fabric to be actually used must have an area considerably larger than the laying area, which is economically disadvantageous.

(c) Problems to be Solved by the Invention The present invention provides a connection method that allows nonwoven fabrics to be easily connected to each other as necessary when nonwoven fabrics are used for various purposes such as civil engineering sheets and agricultural sheets. This is what I am trying to do.

(d) Means and action for solving the problems The present invention includes:
Nonwoven fabrics having a large number of separated eta fibers with both ends fixed to the main body are connected to each other via a sheet-like joining member having a large number of hooks on at least one side that can engage with the separated fibers of the nonwoven fabric. This is a method for connecting nonwoven fabrics.

Nonwoven fabrics that can be used in the present invention include short fiber nonwoven fabrics formed using cards, random webs, etc., long fiber nonwoven fabrics manufactured by the spunbond method that are continuously manufactured from melt-spun long fibers, and the like. A nonwoven fabric having a large number of separate fibers with a portion fixed to a nonwoven body. Nonwoven fabrics with such a structure are made by bonding or fusing only the intertwining points of each fiber with a relatively small amount of adhesive or low-melting point fibers, or by needle-punching the web into inner and outer layers. It is formed by intertwining the constituent fibers of the nonwoven fabric with each other, and it is formed by needle punching and then bonding or fusing only the intertwined points of the fibers with a relatively small amount of adhesive or low melting point fibers, etc. At least on the surface of the nonwoven fabric, There are separate fibers whose ends are embedded in the nonwoven fabric body or fixed by adhesive or the like. Polyester-based sheets are used for civil engineering sheets that require high strength.

Most preferred is a long-fiber nonwoven fabric made of synthetic fibers such as polyolefin, formed into a web by a spunbond method, and needle-punched. In the present invention, the nonwoven fabric main body refers to the part that fixes both ends of the separated fibers.

Next, in the present invention, the sheet-like joining member that connects the nonwoven fabrics is provided on at least one side of a sheet-like object such as a woven fabric or a nonwoven fabric 1 synthetic resin sheet, and both ends of the nonwoven fabric are present on at least the surface of the nonwoven fabric. A hook that can engage with the separated fibers fixed to the main body is formed by implantation or integral molding. The hook is made of elastic synthetic fiber 1 synthetic resin or metal, which is thicker than the fibers constituting the nonwoven fabric, and has a hook-shaped or mushroom-shaped tip so that it can be caught on the fiber, and has a length of 0. .5 to 5 is preferable, and 10 to 5 depending on the basis weight of the nonwoven fabric, usage, etc.
They are planted on one or both sides of the sheet-like material or are integrally molded with the sheet-like material at an appropriate density in the range of 0/-. As mentioned above, the sheet-like joining member having hooks on both sides is
It is obtained by planting or integrally molding hooks on both sides of a single sheet, but it is possible to bond two joining members that have hooks on one side.

They may be attached by sewing or other means. Sheet-like joining members usually have a width of 10 to 200 mm depending on the purpose and manner of use.
A long tape-like material about the size of a crane is suitable.

FIG. 1 is a perspective view schematically showing one embodiment of a connecting portion of a nonwoven fabric according to the present invention. That is, two nonwoven fabrics (1a)
and (1b) are lined up, and a large number of hooks (
3) is stacked on approximately half of the hook surface of one sheet-like joining member (2) and pressed by an appropriate means, and each hook (3) of the sheet-like joining member (2) is made of non-woven fabric (LA).
This is an example in which separated fibers (1aF 2 ) and (1bF 2 ) whose both ends are fixed to the nonwoven fabric body are engaged with the surfaces of (1b) and (1b). Although this method requires a slightly wider sheet-like joining member, the nonwoven fabrics (1a) and (1b
) can be used effectively in its entirety.

Moreover, FIG. 2 is a perspective view schematically showing another embodiment of the nonwoven fabric connection part in the present invention. That is, nonwoven fabric (1a)
This is an example in which the ends of (1b) and (1b) are overlapped and connected with an appropriate width across a sheet-like joining member (2) having a large number of hooks on both sides, and the separated fibers on the lower surface side of the nonwoven fabric (1a) are connected. (1aF) is engaged with the hook (3a) on the upper surface side of the sheet-like joining member (2), and the hook (3b) on the lower surface side of the sheet-like joining member (2) separates the upper surface side of the nonwoven fabric (1b). Engaged with fibers (1bF), both woven fabrics (LA),
(lb) is connected. Although this method creates a slight difference in the connection area, it is sufficient to use a narrow sheet-like joining member, and the connection work is extremely easy, making it the most suitable mode for implementation at the sheet installation site. .

(E) Examples Example 1 A 200 g/nf web consisting of 3D polyester long fibers spread and deposited by the spunbond method was #36
Needle method 1 using a regular burp needle punch needle
) Tsuru, number of punches: 80 P/cd Two pieces of needle-punched nonwoven fabric obtained by needle punching are placed on one side of the base fabric with a polypropylene resin with a diameter of about 0.25 mm and a length of 2 cranes with a hook-shaped tip. Using the method shown in Figure 1, overlap the ends of the two-year woven fabric by 51 widths each on a 10a 1) width sheet-like joining member in which hooks made of woven fabric are planted at a density of 30 hooks/-, and simply press down with your hands. The connection was made by joining.

5 in the direction perpendicular to the longitudinal direction of the connecting part of the connecting nonwoven fabric.
A sample piece of am width was collected, and the grip interval was 20 cm.

When the tensile strength was measured at four points at a tensile speed of 20 w/sin, peeling of the crease connection occurred at an average of 9.16 kg, indicating that the connection was extremely strong.

Example 2゜The above Example 1. Two sheets of the needle-punched nonwoven fabric used in Example 1. The sheet-like joining members used in the above were sewn together with their back sides overlapped and connected in the manner shown in FIG. 2 using a sheet-like joining member having a width of 5alI and having hooks on both sides.

Regarding this connected nonwoven fabric, Example 1. When the tensile strength was measured at three points between the two cases, it was found that the connection part finally peeled off at an average weight of 10.4 kg, indicating that the strength of the connection part was extremely high.

(F) Effects of the Invention As described above, when connecting nonwoven fabrics each having a large number of separated fibers with both ends fixed to the main body on at least one surface, the present invention provides a method of engaging with the separated fibers of the nonwoven fabric on at least one side. It is characterized by connecting using a sheet-like joining member formed with a large number of hooks, and if it is a nonwoven fabric having the above structure, it can be used for connecting multiple sheets as necessary when used for various purposes. For example, even when covering a vast area of land such as a sheet for civil engineering, even if the ground condition is poor at the construction site, it can be done very easily, efficiently and wastefully with simple operations. It is an extremely excellent connection method, as it can be connected without any problems, the connection part is very strong, and it can be easily separated if necessary.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing one embodiment of the nonwoven fabric connection portion according to the present invention, and FIG. 2 is a perspective view schematically showing another embodiment of the nonwoven fabric connection portion according to the present invention. (la), (lb)...Nonwoven fabric. (1aF), (1bF) = separated fibers. (2)... Sheet-like joining member.

Claims (1)

[Claims] (1) Nonwoven fabrics having a large number of separated fibers with at least the surface and both ends fixed to the main body are connected to each other via a sheet-like joining member that has a large number of hooks formed on at least one side that can engage with the separated fibers of the nonwoven fabric. A method for connecting nonwoven fabrics.