JPH0952275A - Plate-like stereoscopic air-gap structure made of strand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the bending strength by extruding main lines having thick diameter and made of thermoplastic resin and sub lines having finer diameter than that of the main line from a plurality of nozzles, irregularly winding strands before solidifying, and point sticking them to each other. SOLUTION: Thermoplastic synthetic resin is melted, and extruded to strands downward from a nozzle 7. When melted strands 23 to become extruded main lines 3 and melted strands 25 to become sub lines 5 are brought into contact with cooling liquid 21, they are lighter in specific gravity than the liquid 21, hence the liquid surface is laterally bent to be curled, brought into contact with other adjacent strands to be point stuck while being irregularly bent to form a sponge gourd fiber composition-like stereoscopic air-gap structure 1. After the melted linear states 23, 25 are formed in the structure 1, it is abruptly cooled and solidified. The solidified structure 1 is taken OFF down at the slower speed than the extruding speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional void structure having a plurality of linearly curved lines and spot-bonded in a three-dimensional net shape, and more particularly to a linear line having a substantially rectangular cross section. The present invention relates to a plate-shaped three-dimensional void structure.

[0002]

2. Description of the Related Art A large number of thermoplastic synthetic resin filaments are extruded from a downward nozzle, and these filaments are drawn at a lower speed than an extrusion speed while not solidifying yet.
A three-dimensional void structure made of a filament manufactured by rapidly cooling the aggregate immediately after the point adhesion while the respective molten filaments are tortuous and point-adhered to each other in a three-dimensional network is known. Examples of such a three-dimensional void structure composed of filaments include JP-B-51-16530, JP-B-63-54330, and JP-A-62-128740.
There is one described in the official gazette.

[0003] A method of manufacturing such a three-dimensional void structure is as follows.
According to the publication, a large number of thermoplastic synthetic resin yarns or filaments such as nylon 6 and polypropylene are spun from a downward nozzle and allowed to naturally descend into cooling water, and this is taken up by a take-up roll arranged in water. By pulling it down slower than the descent speed, each line is slid on the surface of the water, and while these lines are in a molten state, they are point-adhesively assembled to each other in a three-dimensional net shape, and then drawn into water. It is cooled and solidified to form a three-dimensional net-like aggregate of a rod-like body or a cylindrical body.

[0004]

However, the conventionally known three-dimensional void structure is a rod-like or cylindrical body having the same cross-sectional shape, and the filaments extruded from the nozzle are of the same size. , The strength against compression and impact was not always satisfactory.
Further, since it is a rod-shaped body or a cylindrical body, there is a problem that a large surface area cannot be obtained. For this,
When used as a transparent wave-eliminating material, a contact oxidizer, an artificial fish reef material, a drainage material for an underdrain, and a drainage material for preventing liquefaction, there was a problem that a sufficient effect was not always obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a plate-shaped three-dimensional void structure composed of filaments having excellent compression resistance and impact resistance and having a large surface area. To do.

[0006]

The present invention has the following configuration to achieve the above object. A plate-shaped three-dimensional void structure comprising a filament according to claim 1 extrudes a main wire made of thermoplastic synthetic resin having a large diameter and a sub-wire having a diameter smaller than the main wire from a plurality of nozzles, respectively, Before it solidifies, it bends irregularly and is glued to each other,
It is characterized by being cooled and solidified. Further, the plate-shaped three-dimensional void structure including the filament according to claim 2 is characterized in that a bulge portion is provided on a side surface. Moreover, the plate-shaped three-dimensional void structure including the filament according to claim 3 is characterized in that two or more bulging portions are continuously provided.

[0007]

Embodiments of the present invention will be described below in detail. FIG. 1 is a perspective view for partially explaining a plate-shaped three-dimensional void structure made of filaments according to the present invention, and FIGS.
FIG. 4 is a plan view of a nozzle attached to the extruder. The three-dimensional void structure 1 according to the present invention comprises a main wire 3 having a large wire diameter and a sub wire 5 having a small wire diameter, and the main wire 3 and the sub wire 5 which are irregularly curved like the fibrous structure of loofah are It is a structure that forms a three-dimensional network by point bonding. The main line 3 and the sub line 5 are formed of a thermoplastic synthetic resin such as polypropylene (PP) and bottom density polyethylene (PE) having a specific gravity of about 0.92 to 0.96. This is because these thermoplastic synthetic resins are lightweight and have excellent flexural strength, and are effective for attaching and growing microorganisms.

The diameter of the main wire 3 is 3 to 10 mm, the diameter of the sub wire 5 is 1 to 2 mm, and the ratio of the main wire 3 to the sub wire 5 is the size of the three-dimensional void structure 1. It may be appropriately determined depending on the purpose of use. The main wires 3 are used for reinforcement and are arranged at arbitrary intervals. When both are combined, the main wires ³ have a surface area of about 58 m ² or more per 1 m ³ and a porosity of 93% or more. In this way, a three-dimensional void structure formed by irregular point bonding like a loofah fibrous tissue has a spring reaction force from the welding contact point, and the flowing water resistance is transformed into linear vibration in water, and the load is extremely increased. Can be reduced.

As shown in FIG. 1, the three-dimensional void structure 1 has a substantially rectangular cross section and is bent irregularly before the main line 3 and the sub line 5 extruded from the nozzle of the extruder solidify. It is formed by twisting and spot-bonding to each other in a three-dimensional net shape, and is formed into a flat plate shape. FIG. 2 shows a nozzle 7 for extruding the three-dimensional void structure 1 having the above-mentioned shape,
A through hole 12 for pushing out the main wire 3 is formed inside, and a through hole 13 for pushing out the sub wire 5 is arranged in a rectangular shape so as to surround the through hole 12. Therefore, the outer surface is generally flat.

Further, the nozzle 9 shown in FIG. 3 is an extrusion nozzle for a three-dimensional void structure having bulging portions 15 in the longitudinal direction at both ends and the central portion, and is an outside nozzle for molding the bulging portion. A small hole is arranged so as to project. As described above, when the bulging portion 15 is provided at an appropriate position, the compressive strength is further improved, and it is suitable as a permeable wave absorber, a contact oxidizer, an artificial fish reef, and the like. Further, the nozzle 10 shown in FIG.
Is a nozzle for extrusion of a three-dimensional void structure in which the bulging portions 16 are continuously provided to have a corrugated shape, and two bulging portions 16 are provided. A substantially triangular non-perforated portion 18 is provided inside the nozzle 10, and a hollow portion is formed in the axial direction in the molded three-dimensional void structure by the non-perforated portion 18. The number of the bulging portions 15 may be one, or may be continuous to form a corrugation. Also, the bulge
6 may be formed at intervals. Further, the three-dimensional void structure may have a substantially rectangular shape in cross section, and includes a rectangular shape having curved surfaces at both ends.

Next, a method for manufacturing the three-dimensional void structure 1 will be described. First, a nozzle having a large number of small holes is attached to an extruder. As shown in FIG. 5, for example, a nozzle 7 having the openings 12 and 13 is attached to an extruder 20, and a cooling liquid tank filled with a cooling liquid 21 is arranged below the nozzle 7. The cooling liquid 21 may be only water,
It is a mixture of water and ethylene glycol, and it is preferable to maintain and manage a predetermined liquid temperature with an electric heater.

In the above structure, polypropylene (PP) and bottom density polyethylene (PE) filled in the extruder 20.
A thermoplastic synthetic resin such as is melted and extruded downward from the nozzle 7 to the filament. When the extruded molten filament 23 serving as the main wire 3 and the extruded molten filament 25 serving as the auxiliary wire 5 come into contact with the cooling liquid 21, the specific gravity is lighter than that of the cooling liquid, so that the liquid surface curls laterally and curls. While curving regularly, other adjacent linear filaments are brought into contact with each other and point-bonded to each other to form a three-dimensional void structure having a loofah fiber structure. After forming the three-dimensional void structure, the molten linear shapes 23 and 25 are rapidly cooled and solidified.

The solidified void structure is drawn downward at a rate lower than the extrusion rate. There is no particular limitation on the method of pulling it out, but it is also possible to dispose rotating rolls on both sides of the three-dimensional void structure and send them out by being sandwiched by the rotating rolls. By adjusting the take-up speed, it is possible to change the size of the curl in the shape of a fusion line, and the slower the take-up speed is, the larger the curl becomes. The surface area and porosity of the filament can be adjusted by the mass of the filament to be extruded. When the diameter of the main wire 3 is 5 mm, the diameter of the sub wire 5 is 1.5 mm, and the diameter of the three-dimensional void structure is 300 mm, the void ratio is approximately 93.1%.

Next, a method of using the plate-shaped three-dimensional void structure will be described. The three-dimensional void structure having the above configuration has a specific gravity of about 0.92 to 0.96, which is lighter than that of water. Therefore, a plurality of plate-shaped three-dimensional void structures are vertically aligned in water and fixed and laid by anchor ropes to form a transparent wave-eliminating material, a contact-oxidizing material, and an artificial fishing reef. The position where the three-dimensional void structure is deposited can be freely controlled from the sea surface to the sea floor. Since the plate-shaped three-dimensional void structure has a flat surface, the contact area is large, and it is effective as a permeable wave absorber, a contact oxidizer, and an artificial fishing reef.

That is, when it is installed on a revetment wall, a shallow water, or the like where a sea wave hits, it can be used as a transparent wave-eliminating material or an erosion-preventing material. Further, when it is installed in a shallow sea area or a river or a lake where sunlight can reach, it can be used as a contact oxidizing material for water purification or as an artificial reef to which seaweed or algae can be attached. Further, it is more effective when not only one row but two or more rows are arranged at regular intervals. The plate-shaped three-dimensional void structure,
Instead of fixing with a rope, a weight such as concrete may be attached to one end to complement the weight and put into water. Further, by embedding the plate-shaped three-dimensional void structure in a wetland, a soft ground, etc., it can be used as a drainage material for underdrain or a drainage material for preventing liquefaction.

[0016]

Since the present invention is configured as described above, the following specific effects can be obtained. That is, since the plate-shaped three-dimensional void structure comprising the filaments according to the present invention is a combination of a thick main line and a thin sub line, the sub line increases the surface area of the entire line, and the main line welds the surface of the line. Can be increased and the bending strength can be improved. Further, since it is plate-shaped, the surface area is increased, and the contact area can be increased.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view showing an example of a three-dimensional void structure according to the present invention.

FIG. 2 is a plan view showing an arrangement example of small holes of a nozzle.

FIG. 3 is a plan view showing another arrangement example of the small holes of the nozzle.

FIG. 4 is a plan view showing another arrangement example of the small holes of the nozzle.

FIG. 5 is an explanatory front view showing the manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solid void structure 3 Main line 5 Subline 7 Nozzle 9 Nozzle 7 10 Nozzle 12 Through hole 13 Through hole 15 Swelling part 16 Swelling part 18 Non-piercing part 20 Extruder 21 Coolant 23 Stroke 25 Stroke

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Claims (3)

[Claims] 1. A plurality of main wires made of a thermoplastic synthetic resin having a large wire diameter and a plurality of sub wires having a wire diameter smaller than the main wire are extruded from a plurality of nozzles, respectively, and the wires are irregularly bent before being solidified. A plate-like three-dimensional void structure consisting of filaments, which is obtained by spot-bonding to each other and then cooling and solidifying. 2. A plate-shaped three-dimensional void structure comprising a line according to claim 1, wherein a bulge portion is provided on a side surface. 3. The plate-shaped three-dimensional void structure comprising a filament according to claim 2, wherein two or more bulging portions are continuously provided.