JPS6053231B2 - Fluid-permeable flexible pipe and method for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The fluid-permeable flexible pipe of the present invention and its manufacturing method will be described in accordance with the following items.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problems to be solved by the invention E. Means for solving the problems F. Examples [Figures 1 to 3] G. Effects of the invention (Industry A) FIELD OF THE INVENTION The present invention relates to a fluid-permeable flexible pipe and a method for manufacturing the same.

Specifically, it is a water supply and drainage pipe that is used buried in the soil, and has uniform fluid permeability and excellent fluid filtration performance, and is also flexible and retains its shape even when buried in the soil. It is an object of the present invention to provide a novel fluid-permeable flexible pipe that has excellent properties and is also easy to transport and work, and a method for manufacturing the same. (Summary of the invention B) The fluid-permeable flexible pipe of the present invention and its manufacturing method include:
A spirally wound strip of nonwoven fabric is layered on adjacent side edges, and the reinforcing body is integrated into the cylinder by heat fusion of the low melting point component in the composite thermoplastic synthetic fiber contained in the cylinder. This strengthens the bonding force between the cylindrical body and the reinforcing body, and also allows the cylindrical body and the reinforcing body to be integrated in order to melt the high melting point components of the cylindrical body. The structure of the nonwoven fabric can be maintained even at the bonded portion, and the transmission efficiency will not be reduced.

(C Prior Art) The pipes that have been commonly used as water supply and drainage pipes that are buried in the soil include ceramic, concrete,
There were synthetic resin tubes and composite products of these and filter media such as woven and non-woven fabrics.

However, these pipes are heavy and rigid, making them inconvenient to transport and difficult to construct.Also, even though the pipes have a large cross-sectional area and high water permeability, the permeability of the outer surface of the pipe is low. Furthermore, the filtration area was small, resulting in a lack of water supply and drainage capacity. Therefore, in order to eliminate the drawbacks of the above-mentioned pipes mainly made of ceramic, concrete, or synthetic resin, a cylinder is formed from a flexible sheet material with filterability, and reinforcing bodies are spirally arranged on the surface of this cylinder. It has been proposed that the material be wound around and glued.

This structure is lighter than the conventional one, so it has excellent transportability, and the one that uses synthetic resin for the reinforcing body has good workability and has a sufficient filtration area on the outside of the tube. Therefore, it also has the advantage of excellent water supply and drainage capacity. (Problem to be solved by Invention D) However, in the case of a filtration vibrator having such a structure, an adhesive is required to connect the cylinder and the reinforcing body, which complicates the manufacturing process and increases the manufacturing cost. There are some drawbacks.

Further, in order to avoid the use of adhesives, the cylindrical body is formed of a nonwoven fabric made of thermoplastic synthetic fibers, which is heated and melted, and the reinforcing body is brought into close contact with the cylindrical body in this molten state. It is also possible to integrate the cylindrical body and the reinforcing body by so-called heat fusion, but according to this method, the fibers constituting the nonwoven fabric will melt in the areas where the reinforcing body and the cylindrical body are in close contact with each other. This is due to the fact that the material is no longer fibrous and its strength is reduced, and that the area in question no longer has the properties of a nonwoven fabric and stress tends to concentrate at the bonding boundary with the cylindrical body. There is a drawback that when tensile stress is applied to the nonwoven fabric constituting the cylinder, it easily tears from the bonding boundary with the reinforcing body. (Means for Solving Problem E) In order to solve the above-mentioned problems, the fluid-permeable flexible vibrator and the manufacturing method thereof of the present invention have a nonwoven fabric in which one fiber has a higher melting point than the other. The nonwoven fabric is formed to include a composite thermoplastic synthetic fiber consisting of two polymer components, and the nonwoven fabric is spirally wound to form a cylindrical body, and reinforcing bodies are placed on adjacent side edges of the nonwoven fabric. The composite thermoplastic synthetic fiber is integrated into a cylindrical body by thermal fusion of low melting point components.

Therefore, according to the fluid permeable flexible vibrator and the manufacturing method thereof of the present invention, it is possible to strengthen the bonding force between the cylindrical body and the reinforcing body, and also to strengthen the bonding force between the cylindrical body and the reinforcing body without melting the high melting point component of the cylindrical body. The reinforcing body can be integrated with the cylindrical body, the joint portion of the cylindrical body and the reinforcing body can be maintained in a structure as a nonwoven fabric, and excellent permeability and filtration performance can be achieved.

(Embodiment F) The present invention will be described in detail below with reference to the accompanying drawings.
1 is a cylindrical body with a band-shaped nonwoven fabric 2 attached to its side edges 3, 3...
... are wound spirally so that they are adjacent to each other.

In order to spirally wind the nonwoven fabric 2, for example, it is spirally wound around a winding shaft 4 that is configured to be fed out by a pitch corresponding to the width of the nonwoven fabric 2 in one rotation. The nonwoven fabric 2 constituting the cylindrical body 1 is formed by heat-treating a fiber aggregate containing composite thermoplastic synthetic fibers, one of which has a higher melting point than the other and is made of two types of polymer components. 5 is a reinforcing body made of thermoplastic synthetic resin, and adjacent side edges 3 of the nonwoven fabric 2 are
, 3 and are placed in close contact with each other.

This adhesion is achieved by heating and melting the low melting point components of the composite fibers in the portion where the reinforcing bodies 5 are overlapped, that is, by thermal fusion. Further, it is preferable that 20% or more of the outer surface area of the cylindrical body 1 is in close contact with the reinforcing body. Incidentally, even if all of the fibers constituting the nonwoven fabric 2 are composite thermoplastic synthetic fibers as described above,
A mixture of such composite fibers and single-component synthetic fibers may be used.

Examples of combinations of the two components of the composite thermoplastic synthetic fiber and the components of the reinforcing body suitable for the present invention are shown in the following table. (Effects of the Invention G) As is clear from the above description, the fluid-permeable flexible vibrator of the present invention has a cylindrical body formed by spirally winding a band-shaped nonwoven fabric, and a phase of the nonwoven fabric constituting the cylindrical body. The nonwoven fabric constituting the cylindrical body has two polymers, one of which has a higher melting point than the other, in its fiber aggregate components. It contains a composite thermoplastic synthetic fiber consisting of a combined component, and the reinforcing body is integrated into the cylindrical body by thermal fusion of a low melting point component in the composite thermoplastic synthetic fiber contained in the cylindrical body. The method for manufacturing the fluid-permeable flexible vibrator of the present invention is characterized by heat-treating a fiber assembly containing composite thermoplastic synthetic fibers made of two polymer components, one of which has a higher melting point than the other. A belt-shaped non-woven fabric is formed, this non-woven fabric is spirally wound to obtain a cylindrical body, and thermoplastic synthetic resin pads are placed on adjacent side edges of the non-woven fabric constituting the cylindrical body. It is characterized in that the reinforcing bodies are overlapped and the low melting point component of the composite thermoplastic synthetic fiber is heated and melted, thereby integrating the reinforcing body into the cylindrical body.

Therefore, according to the fluid-permeable flexible vibrator of the present invention, the nonwoven fabric constituting the cylindrical body includes composite thermoplastic synthetic fibers consisting of two components having different melting points in the fiber aggregate, and the reinforcing body and the cylindrical body have different melting points. Because it is bonded to the body by heat fusion,
It is possible to maintain the structure of a non-woven fabric even in areas where the cylindrical body is in close contact with the reinforcing body, and the transmission efficiency is not reduced, and the reinforcing body does not lose sufficient strength as a reinforcing body. Nor.

Furthermore, since the cylindrical body is formed by spirally winding the strip-shaped nonwoven fabric, the length of the cylindrical body can be increased as long as the material lasts. In addition, according to the method of manufacturing the fluid-permeable flexible vibrator of the present invention, the cylindrical body and the reinforcing body are bonded by heat melting, so there is no need for the conventional bonding process, adhesive management, handling, etc. This eliminates the hassle and reduces the cost of manufacturing a fluid-permeable flexible vibrator.

In addition, when the cylindrical body and the reinforcing body are made into a saw body by heat fusion,
It is preferable that the reinforcing body 5 is not only in a state in which only the low melting point components of the nonwoven fabric are fused, but also in a semi-molten state so that the reinforcing body 5 does not lose its shape, since the adhesion between the two is strong.

Therefore, when the low melting point component in the nonwoven fabric 2 melts, since the reinforcing body 5 is semi-molten and plasticized under the same temperature conditions, the reinforcing body 5 must be the same as the low melting point component of the nonwoven fabric 2. It is preferable to use a thermoplastic synthetic resin having a melting point of about 100% or slightly higher than that of the low melting point component. In addition, in the flexible vibrator of the present invention, 20% of the outer surface area of the cylindrical body made of nonwoven fabric
In the above, it is preferable that the reinforcing body is in close contact with the reinforcing body, and in particular, the outer surface of
If 0% or more is integrated with a rigid reinforcing body, it will not collapse even if stress due to earth pressure or the like is applied in a diagonal direction with respect to the length direction of the cylindrical body.

In addition, if the contact area between the reinforcing body and the cylindrical body is less than 20% of the outer surface area of the cylindrical body, or in extreme cases, the reinforcing body is linear, there is almost no pressure resistance effect against the pressure in the diagonal direction mentioned above, There is a growing fear that it will be destroyed. Furthermore, the reinforcing body 5 is extrusion molded, and the extrusion speed of the extrusion molding machine 6 is synchronized with the winding speed of the winding shaft 4 that spirally winds the nonwoven fabric 2, and the nonwoven fabric 2 is wound up. At the same time as winding up around the shaft 4, the reinforcing body 5, which has just been extruded and is still uncooled and semi-molten, is piled onto the adjacent side edges 3, 3 of the nonwoven fabric 2, and the residual heat of the reinforcing body 5 is used to By melting the low melting point component of the nonwoven fabric 2,
If the cylindrical body 1 and the reinforcing body 5 are thermally fused in this manner, the formation of the cylindrical body 1 and its integration with the reinforcing body 5 can be simultaneously enhanced, and the work process can be simplified. It is extremely simplified and contributes to cost reduction.

In addition, although the above explanation has been made using the case where the flexible vibrator of the present invention is used as a drainage vibrator for civil engineering, the present invention is not limited to this.
It can be used for other purposes, such as as an air filter for air conditioning equipment or as a fluid filtering material. Furthermore, since the cylindrical body is made of non-woven fabric, it exhibits approximately uniform fluid permeability over the entire body, and can be used as a medium when uniformly distributing fluids such as hot air or cold air into a specified space. is also suitable. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of the fluid-permeable flexible vibrator of the present invention, Fig. 2 is a vertical side view thereof, and Fig. 3 is a diagram of the method for manufacturing the fluid- and body-permeable flexible vibrator of the present invention. It is a perspective view showing an example.

Explanation of the symbols: 1...Cylindrical body, 2...Nonwoven fabric, 3...Side edge of nonwoven fabric, 5...Reinforcement body.

Claims (1)

[Claims] 1. A cylindrical body formed by spirally winding a band-shaped nonwoven fabric, and a reinforcement made of thermoplastic synthetic resin that is overlapped and integrated with the adjacent side edges of the nonwoven fabric constituting the cylindrical body. The nonwoven fabric constituting the cylindrical body contains composite thermoplastic synthetic fibers consisting of two polymer components, one of which has a higher melting point than the other, in its fiber aggregate component, and the reinforcing body has a cylindrical body. It is integrated into the cylindrical body by thermal fusion of the low melting point component in the composite thermoplastic synthetic fiber contained in the body. A fluid-permeable flexible pipe characterized by: 2 A fiber aggregate containing a composite thermoplastic synthetic fiber consisting of two polymer components, one of which has a higher melting point than the other, is heat-treated to form a band-shaped nonwoven fabric, and this nonwoven fabric is spirally wound to form a cylindrical body. obtained, a reinforcing body made of thermoplastic synthetic resin is superimposed on adjacent side edges of the nonwoven fabric constituting the cylindrical body,
A method for manufacturing a fluid-permeable flexible pipe, characterized in that the low melting point component of the composite thermoplastic synthetic fiber is heated and melted, thereby integrating the reinforcing body into the cylindrical body.