JPH0529233Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drain material with good water collection and water permeability.

[Conventional technology]

Conventionally, nonwoven fabrics, paper, and the like have been known as drain materials, and specifically, paper drains, water collection materials in which nonwoven fabric is integrated with a corrugated board, and the like have been used.

[Problem that the invention attempts to solve]

Drain materials using nonwoven fabrics and paper mentioned above do not have sufficient water permeability and permeability because the fibers are oriented in random directions, and they tend to become clogged and sag, meaning that they do not function permanently as drain materials. .
The present invention provides a drain material that has excellent water permeability and permeability, is less prone to clogging and settling, and has excellent drainage performance and durability.

[Means for solving problems]

The present invention is a drain material comprising a rod-like or string-like body made of an aggregate of directional staple fibers, the fibers of which are bonded at least in the surface layer.

First, the staple fiber aggregate in the present invention is formed from various fibers, but synthetic fibers having particularly excellent corrosion resistance are used. Among these fibers, those whose surfaces have been treated to be hydrophilic or water-absorbing, or those whose surfaces have been physically imparted with water-absorbing properties (porous, hollow, etc.) are preferable. Of course,
The main staple fiber is one that is not substantially melted, softened, or melted when a binder resin, which will be described later, is applied or softened or melted.

In the present invention, a binder resin is mixed into these fiber aggregates. The binder resin is
It may be a solution type, an emulsion type, or a powder type. Adhesion between fibers can be obtained by evaporating and removing the solvent or dispersion medium in the case of a solution type or emulsion type, or by softening or melting in the case of a powder type. In addition to these, the binder resin may have a fibrous form. In particular, in the drain material of the present invention, it is preferable to use heat-adhesive fibers as the binder resin in terms of fiber directionality and water permeability. The heat-adhesive fibers include low softening point or low melting point fibers made of polyolefin resin, undrawn synthetic fibers such as undrawn polyester fibers, low softening point or low melting point fibers such as polyethylene-polyester, modified polyester-polyethylene terephthalate, etc. Various known fibers can be used, such as core-sheath type or bimetal type composite fibers of polymers and high softening point or high melting point polymers. The mixing ratio of thermally adhesive fibers is 10 to 50% by weight, especially 10 to 30% by weight in terms of surface adhesion and water permeability.
Weight percent is preferred.

The fiber aggregate can be obtained, for example, by mixing the above-mentioned fibers into a web with a card and passing it through a trumpet-shaped guide nozzle.

In order to soften and melt the heat-adhesive fibers at least in the surface layer of the fiber assembly and bond the fibers together, the fiber assembly may be passed through a cylindrical heater. Incidentally, the inlet of the heater may be shaped like a trumpet in order to continuously collect the fibers and bond between the fibers. The thermoadhesive fibers may be simultaneously softened and melted inside the fiber aggregate to bond the fibers together.

The surface layer of the fiber aggregate to which the fibers are bonded is film-like, has a rod-like or string-like shape as a whole, and has crush resistance, but the surface layer has countless fine gaps and has sufficient ventilation. It has water-based properties.

In the present invention, such a rod-like or string-like body can be used alone as a drain material, but it is also effective to converge or collect them in a planar shape and use them as a drain material. When converging, this is done by at least partially bundling or covering with a filter member such as a thin non-woven fabric, and when gathering in a plane, means such as interlacing are used.

Further, in order to impart strength or a certain degree of hardness to these drain materials, it is also effective to arrange mulch or monofilament in the center of the fiber aggregate. Further, the cross-sectional shape of the drain material of the present invention as a single unit can be arbitrarily determined by selecting the cross-sectional shape of the passage of the cylindrical heater.

The thickness of a single drain is preferably selected so that the diameter is approximately 1 to 30 mm, more preferably 5 to 20 mm, when converted to a circle equivalent to the cross-sectional area.

FIG. 1 is a perspective view showing an example of the drain material of the present invention, where 1 is an aggregate of staple fibers, 2 is a surface layer portion where the fibers are bonded together, and 3 is a fine gap or fine hole in that portion. In addition, FIG. 2 shows another drain material of the present invention in which the drain material 4 of FIG. 1 is collected and covered with a filter member 5, and FIG. FIG. 2 is a perspective view of the drain material of the present invention, which is welt-knitted with threads.

[Action and effect]

The drain material of the present invention has countless fine gaps or pores on its surface, has sufficient water permeability and filterability for mud, and can guide water in mud to the inside. Since it has a structure in which the fibers are arranged in one direction, its water permeability is high and the drainage effect is extremely high. In addition, this drain material has crush resistance, and the above-mentioned water permeable structure is not damaged by earth pressure.

The drain material of the present invention can be usefully used as a vertical drain, horizontal drain, underdrain drainage material, or surface drainage material, and its drainage performance and drainage effect are extremely long-lasting.

[Brief explanation of the drawing]

1, 2, and 3 are perspective views showing the drain material of the present invention. In the figures, 1 is an aggregate of staple fibers, 2 is a surface layer formed by adhering fibers, and 3 is a part of that part. 4 is a single drain material of the present invention, 5 is a filter material, and 6 is a thread for weaving the drain material.

Claims (1)

[Claims for Utility Model Registration] 1. A drain material comprising a rod-like or string-like body made of an aggregate of directional staple fibers, the fibers of which are bonded at least in the surface layer. 2 Utility model registration claim 1, in which the aggregate of staple fibers contains heat-adhesive fibers, and the heat-adhesive fibers soften or melt in the surface layer of the aggregate, thereby bonding the fibers. Drain material described in section. 3. The drain material according to claim 2 of the utility model registration claim, in which 10% to 50% of heat-adhesive fibers are mixed. 4 Utility model registration claims paragraphs 1 and 2 in which a filament is inserted in the center of the fiber aggregate
Drain material according to item or item 3. 5. The drain material according to claim 1, 2, 3, or 4 of the utility model registration claim, in which a plurality of rod-like or string-like bodies are assembled or converged in the same direction. 6. The drain material according to claim 5, in which rod-like or string-like bodies arranged in one direction are braided. 7. The drain material according to claim 5 of the utility model registration, which is composed of a converging body of converged rod-like or string-like bodies, the surface of which is coated with a filter member.