JP2001329631A - Recycled acoustic building material, and method and apparatus for producing recycled acoustic building material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycled acoustic building material aiming at cost reduction. SOLUTION: The recycled acoustic building material 1 is formed of a recycled thermoplastic resin as a raw material or a main raw material. The building material is characterized by a plate-like three-dimensional network structure which is obtained by randomly entwining a plurality of filaments and partially heat-bonding the same to each other. It is preferable that a surface side of any of a single surface, both surfaces, three surfaces, or four surfaces of the three-dimensional network structure has a density which is relatively lower than the density of a portion other than the surface side. The recycled thermoplastic resin employs flakes or chips of PET bottles as a raw material or a main raw material, which are obtained by crushing the PET bottles as they are and melting the same into a flaky shape. The thus obtained recycled sound absorptive building material is suitable for the age of recycle boosting, and displays its power in reduction of disposal costs. The recycled acoustic building material 1 is mainly applicable to lower and interior portions of a floor material, for instance, and further it may be applicable to an interior portion of a double wall body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a soundproof floor,
The present invention relates to a recycled sound-absorbing building material that realizes prevention of dew condensation and the like.

[0002]

2. Description of the Related Art In recent years, propagation of indoor noise, particularly floor impact noise, downstairs has become a serious problem, resulting in deterioration of the housing environment. The floor impact sound generated in a living space is a solid sound and is divided into a heavy floor impact sound (L _H ) and a lightweight floor impact sound (L _L ). The magnitude of the heavy floor impact noise depends on the structure of the building, such as rigidity, and the characteristic of the lightweight floor impact noise is that the difference between the finished floor materials is large. The floor material is provided with a sound insulation class called an L value, which indicates how much the sound of hitting the floor on the upper floor is transmitted to the lower floor. The smaller the value, the better the characteristics. The sound insulation standards for floors are determined by JIS and the like, and various sound absorbing building materials have been invented to satisfy the standards.
For example, in the wet floor method shown in FIG. 12, styrofoam 100 or the like is placed on a mortar dumpling or ridge 102 formed on a concrete slab 101, and a floor finishing material 103 such as a flooring, a carpet, or a PVC sheet is placed thereon. An example of pasting is given. In the dry double floor shown in FIGS. 13 and 14, the floor base panel 132 is supported at a predetermined height level by unit support legs 131 on the floor surface of a foundation floor 130 such as a concrete slab of an apartment or the like. Each floor base panel 13 which forms the floor base of the floor and is laid
2, a sound absorbing material 133 made of styrene foam, nonwoven fabric, glass wool, or the like is provided in a region other than the installation positions of the unit support legs 131, and a vibration damping and sound insulating sheet 134 is laid on the formed floor substrate. Then, there is a floor covering material flooring 135 laid thereon.

[0003]

However, the wet floor of the concrete floor described above emits humidity for a long period of time, which may cause a build-up of humidity and cause a problem due to the humidity. Although the above-mentioned dry floor can solve the problem of humidity and ensure sound insulation to some extent, there is a limit to the reduction in cost. In the construction industry, if it is not aimed at cost reduction, it will not be widely spread to consumers. On the other hand, although collection of PET bottles etc. is progressing,
Recyclers of PET bottles also have no use and have difficulty in processing. At present, the recycling of thermoplastic resins is slow and slow. And the cost of processing waste increases,
There is also a need for the viewpoint of recycling wastes, and there is an increasing demand for eco-friendly products that are environmentally friendly.

Accordingly, the present invention is to provide a recycled sound-absorbing building material having a three-dimensional net made of a thermoplastic resin, which has a sound absorbing property and is mainly made of recycled material and which can be recycled to reduce costs. Aim. Thermoplastic resin, especially PET
It is an object of the present invention to provide a product that uses a recycled bottle as a raw material or a main raw material, blocks sound and vibration, and is excellent in shock absorption.

[0005]

DISCLOSURE OF THE INVENTION In view of the above problems, the invention according to claim 1 uses a recycled thermoplastic resin as a raw material or a main raw material, and a plurality of filaments are spirally and randomly entangled with each other. This is a recycled sound-absorbing building material characterized in that it is a three-dimensional network structure thermally bonded. Thereby, the three-dimensional network-like structure attenuates the sound and effectively exhibits the sound absorbing property, so that the problem can be suitably solved. A PET bottle (abbreviation for polyethylene terephthalate bottle) is suitable as a raw material or main raw material of the recycled thermoplastic resin. The reason that this can be adopted is that PET bottles are now disposed of in large quantities, and this disposal processing is considered to require enormous disposal costs. From the viewpoint of promoting recycling, if this is diverted to the housing industry, significant cost reduction will be achieved. Is possible.

According to a second aspect of the present invention, the density of the one-sided, double-sided, three-sided or four-sided surface of the three-dimensional network structure is relatively lower than the density of a portion excluding the surface side. The recycled sound-absorbing building material according to claim 1, wherein: Accordingly, sound leakage can be prevented by the high-density region, and the sound absorbing property is further improved.

According to a third aspect of the present invention, the density of the three-dimensional or four-sided surface side and the intermediate portion of the three-dimensional network structure is relatively lower than the density of the portion excluding the surface side. A recycled sound-absorbing building material according to claim 2, characterized by:

According to a fourth aspect of the present invention, there is provided a three-dimensional network structure in which a regenerated thermoplastic resin is used as a raw material or a main raw material, and a plurality of filaments are entangled spirally and randomly with a sheet and partially heat-bonded. The recycled sound-absorbing building material according to claim 1, wherein: The sheet enhances the sound absorbing effect.

According to a fifth aspect of the present invention, there is provided at least one of an endless member provided with an endless member which is extruded downward from a die having a plurality of holes, and which is partially submerged, by using a molten thermoplastic resin as a raw material or a main raw material. When the three-dimensional mesh-like structure is manufactured by lowering naturally between the endless conveyors and drawing the filaments slower than the descending speed, the distance between the endless conveyors is determined by the width of the aggregate of the extruded filaments. Is set to be narrow, and at least one surface of the aggregate of the filaments contacts the endless member before and after the endless member is submerged in water. This can solve the same problem as the first aspect of the present invention.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a recycled sound-absorbing building material 1 according to a first embodiment is made of recycled thermoplastic resin as a raw material or a main raw material, and a plurality of filaments are randomly and entangled spirally. This is a recycled sound-absorbing building material characterized in that it is a three-dimensional network structure that is thermally bonded to each other. It is preferable that the density of one surface, both surfaces, three surfaces, or four surfaces of the three-dimensional network structure is relatively lower than the density of a portion other than the surface. A flake shape or a chip shape of a PET bottle is used as a raw material or a main raw material of the recycled thermoplastic resin. P
The ET bottle is crushed as it is and melted to form a flake shape. Suitable for the age of promoting recycling. If this is not a recycled product but a genuine product, the manufacturing cost per 1 m ² doubles in terms of cost such as dry crystallization or dust removal. Effective in reducing waste disposal costs. It is also applicable to thermoplastic resins other than PET. For example, polyethylene as a thermoplastic resin,
Examples include polyolefins such as polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 66, polyvinyl chloride, polystyrene, copolymers and elastomers copolymerized based on the above resins, and blends of the above resins. Further, as an application of the recycled sound-absorbing building material 1, there is an example mainly applied under or inside a floor material, but it can also be applied inside a double wall. In the first embodiment, the inside is formed with a substantially uniform density. Apparent density is 0.02
To 0.9 g / cm ³ (the porosity is equivalent to 36 to 98.4%), and particularly preferably 0.05 to 0.15 g / cm ³ . The recycled sound-absorbing building material 1 is, for example, 0.1 m to 2 m wide.
m, the thickness is preferably 5 mm to 200 mm, it is endless in the length direction, and has an appropriate length (for example, 900 m
m), but is not limited to these size examples.

[0011] The recycled sound absorbing building material 2 of the second embodiment (FIG. 2)
(See (a)) is a modification of the first embodiment.
It is a two-sided molding, and a region at a predetermined interval from a pair of wide surfaces toward the inside is formed with high density, and the density of the region inside the central portion is set lower than that. . In other words, a pair of wide surfaces are forcibly formed by an endless conveyor or the like, which will be described later, and the edges are aligned more clearly than the other surfaces.

The recycled sound absorbing building material 3 of the third embodiment (FIG. 2)
(Refer to (b)) is a three-sided molding in which the other surface is irregular, and the region at a predetermined interval from the other surface to the inside in the second embodiment is formed with high density. The density of the region inside the central portion is set lower than that. Various forms can be manufactured as compared with the second embodiment. In addition, the soundproofing effect of the floor and the wall is improved. The step-up joining by the end face joining of the reproduced sound-absorbing building material 3 enhances the effect of preventing sound from being lost, and has an advantage that it is not processed in a later step. In the second embodiment, the surface is flattened substantially because the both sides of the long side of the aggregate are in contact with the endless conveyor with a low density, but the disordered helical shape is unaligned on the left and right end surfaces of the aggregate. However, in the third embodiment, at least one surface is formed.

The recycled sound absorbing building material 4 of the fourth embodiment (FIG. 2)
(Refer to (c)) is a four-sided molding, in which all surfaces are aligned, and regions at predetermined intervals from the left and right side surfaces to the inside of the recycled sound-absorbing building material 1 of the first embodiment are formed with high density. The density of the region inside the central portion is set lower than that. That is, regions except for the upper surface and the bottom surface and at predetermined intervals from all surfaces toward the inside are formed with high density. Various forms can be manufactured as compared with the second and third embodiments, and the sound absorbing properties are further improved.

The reproduced sound-absorbing building material 5 of the fifth embodiment has a modified surface. For example, one having a convex surface 5A (see FIG. 4 (a)), one having a concave surface 5B (see FIG. 4 (b)), and one having a plurality of continuously formed uneven surfaces 5C (see FIG. 4) (C), a plurality of sawtooth surfaces 5D (see FIG. 4 (d)), a plurality of wavefronts 5E (see FIG. 4 (e)), and a curved corner (R) shape. 5F (see FIG. 4 (f)), 5G (see FIG. 4 (g)) whose angle is cut to a predetermined angle (here 45 degrees),
Alternatively, an appropriate combination of them can be cited, and various types of products are required as products at a building construction site, and this can be met. Also, by making it a complicated shape,
It is considered that the sound absorbing property is enhanced. In particular, by forcibly molding the three or four sides of the recycled sound-absorbing building material as in the third and fourth embodiments described above, various product requirements can be satisfied. More generally, for a deformed shape required for a product, the required shape is cut or molded in a later step to form a deformed net. According to the present embodiment, the shape required for the product is The product can be provided immediately without finishing the dimensions in the post-process, and the post-process can be eliminated.

The recycled sound absorbing building material 6 of the sixth embodiment (FIG. 2)
(See (d)) includes one or more (here, two) hollow portions 6A and 6B, and aims at further reducing the cost, improving the sound absorbing effect, and the like.

The sound-absorbing construction material 7 of the seventh embodiment (FIG. 2)
(Refer to (e)). In the hollow portions 7A and 7B similar to the hollow portions 6A and 6B of the recycled sound-absorbing building material 6 of the sixth embodiment, a recycled member 7 such as a plate-shaped recycled veneer or a plate-shaped recycled shredder dust is provided.
It contains C and 7D, and is intended for the purpose of improving sound absorption, combining materials, and the like by using a recycled plate material.

The recycled sound absorbing building material 8 of the eighth embodiment (FIG. 2)
(Refer to (f)), the density is increased in the thickness direction inside the reproduced sound-absorbing building material 4 of the fourth embodiment, and a single or plural (here, three) beam-shaped high-density regions 8A are partially formed. , 8
By forming B and 8C at predetermined intervals, the sound absorption is improved.

The recycled sound absorbing building material 9 of the ninth embodiment (FIG. 2)
(See (g)) is to improve the sound absorbing property by increasing the density in the width direction and partially forming one or more (here, one) high-density regions 9A inside thereof. is there.

The recycled sound-absorbing building material 80 of the tenth embodiment (FIG. 2)
(See (h)) in the ninth embodiment.
A has a corrugated shape to enhance sound absorption.

The recycled sound absorbing building material 85 of the eleventh embodiment (FIG. 3)
(See (a)) is to improve the sound absorption by forming a sheet 85A (a region without voids) at a predetermined position in the width direction inside the reproduced sound absorbing building material 2 of the first embodiment. The filament (resin thread) is entangled around the sheet 85A. The sheet 85A may be provided so as to have a full width as shown, or may be provided partially, for example, in a central portion or the like.

The recycled sound absorbing building material 85 of the eleventh embodiment
The sheet 85A of FIG. 3 (b) is formed in a substantially corrugated shape to enhance the sound absorption. The reason why such a corrugation can be obtained is that the take-up speed of the roll is lower than the descent speed of the resin yarn, as described later. Sheet 85A
, The height, the width, etc. of the waves vary depending on the manufacturing conditions and are not limited to those shown in the figure. When the interval between the waves is narrow, the sheets 85A may come into contact with each other and be bonded. The eleventh embodiment can be manufactured by using the slits (linear through grooves) 75a in FIG.

(Sound Absorbing Building Material Manufacturing Apparatus) Next, a description will be given of a recycled sound absorbing building material manufacturing apparatus 10. This recycled sound absorbing building material manufacturing apparatus 1
0 is an extruder 11, endless members 12, 1 as shown in FIG.
3, a pair of endless conveyors 14 and 15 (see FIG. 7), a drive motor 16 for driving endless members 12 and 13,
A transmission 17 composed of a chain and gears for shifting the moving speed of the endless members 12, 13, a pair of endless conveyors 1
It comprises a water tank 18 for partially submerging 4 and 15, a control device 19, and other instruments and the like.

As for the endless members 12 and 13, a plurality of metal (here, stainless steel or the like) plate members 21 are provided in predetermined gaps 22 (FIG. 8).
(See FIG. 7A) and connected to a plurality (two in this case) of endless chains 12a and 13a (see FIGS. 7A and 7B) by screws (not shown). Instead, as shown in FIG. 8B, a flat belt 23 made of a stainless mesh (wire mesh) without the gap 22 may be used. This mesh belt is made by combining a spiral (spiral) and a rod (power bone), and the shape, wire diameter,
Depending on the pitch), various types are completed. Excellent in smooth movement, keeping the belt surface horizontal, excellent in high temperature use, and easy to repair. Alternatively, as shown by a dotted line in FIG.
It is also possible to implement a structure that is stretched on the outer periphery of each of the members 2 and 13, which is suitable when it is desired to prevent the formation of unevenness due to the gap 22.
The cross section of the plate material 21 is rectangular, but the convex shape 2
4 (see FIG. 8 (c)), concave 25 (see FIG. 8 (d)), sawtooth 26 (see FIG. 8 (e)), and continuously formed uneven 27 (see FIG. 8 (e)). Various modifications are conceivable, such as FIG.

As shown in FIG. 7, the endless conveyor 14 includes a drive shaft 14b having a sprocket 14a around which the endless chain 12a is wound, and a driven shaft 14d having a sprocket 14c. Also,
The endless conveyor 15 is driven in synchronization with the endless conveyor 14, and is driven vertically with a sprocket 15a around which the endless chain 13a is wound.
And a driven shaft 15d having a sprocket 15c.

As shown in FIG. 5, the extruder 11 comprises a container 31, a raw material supply port 32 provided on the upper part of the container 31, a die 33, a base 34 detachably fixed to a lower end of the die 33, and the like. I have. The temperature inside the die of the extruder 11 is 100 to 400 ° C., and the extrusion amount is 20 to 2
It can be set to, for example, 00 kg / hour. The pressure range of the die 33 is 0.2 to 25 MPa, for example, a discharge pressure of a 75 mm screw. If the thickness of the recycled sound absorbing construction material exceeds 100 mm, it is necessary to make the die pressure uniform by a pump or the like. Therefore, it is necessary to increase the pressure in the die by a gear pump or the like in order to uniformly discharge the filaments from the whole area in the die. At this time, in order to form the shape of the three-dimensional net-like sheet, each surface of the endless conveyors 14 and 15 has a structure that can freely move, and the shape of the die 34 (the hole H
(Density or diameter) and the conveying speed of the endless conveyors 14 and 15, a product having a desired density and strength can be manufactured, and various demands for sound absorbing properties of the product can be satisfied.

Here, a description will be given of a reproduction sound absorbing building material manufacturing apparatus 50 in the case of a four-sided molding machine as shown in FIGS. 9 (a) and 9 (b). The recycled sound absorbing building material manufacturing apparatus 50 corresponds to the endless conveyors 14 and 15 in the case of the two-sided molding shown in FIG.
Endless conveyors 54, 55 having rotating shafts 54a, 55a
A pair of rollers 56, 57 having rotatable rotating shafts 56a, 57a whose rotating shafts are arranged orthogonal to the endless conveyors 54, 55 are arranged at the longitudinal ends of these endless conveyors 54, 55. Bevel gears 54b,
54c, and bevel gears 56b, 57b are also provided on the rotating shafts 56a, 57a, respectively.
c and the bevel gears 56b and 57b are meshed with each other,
The motors a and 55a are driven synchronously by a motor M via a chain C, so that the rotating shafts 56a and 57a are also driven synchronously. The other ends of the rotating shafts 56a, 57a are supported by bearings 58a, 58b.

As shown in FIG. 9C, the endless conveyors 54, 5
5, a pair of short endless conveyors 59a, 59
9b may be arranged orthogonally. In this case, the molding can be performed more precisely, and the dimensional accuracy is improved.

As shown in FIG. 9D, it can be manufactured using four-sided molding. Further, as shown in FIG. 9E, three-sided molding can be performed using this. That is, if two dies are provided depending on the type of the recycled sound-absorbing building material and the filaments are extruded in parallel, the production efficiency is doubled.

As shown in FIG. 10, as a modification, drive sources (motors and the like) are provided instead of the above-mentioned synchronous drive, and endless conveyors 64 and 65 and rollers 66 and 67 (may be endless conveyors). Can be independently driven. That is, in the case of three- or four-sided molding, endless conveyors 64 and 65 having rotating shafts 64a and 65a, and rotatable endless conveyors 64 and 65 having their rotating shafts disposed orthogonally to the longitudinal ends thereof. Rotating shaft 66
a and a pair of rollers 66 and 67 provided with 67a. Motors M are also provided on the rotating shafts 66a and 67a, respectively, so that they can be driven independently. Rotary shaft 6
The other ends of 6a and 67a are supported by bearings 68a and 68b.

The hole of the base 34 is in series descending, and there is a hole from which the yarn descends downward and comes out. The intervals may be equal or non-equidistant. The holes can take various arrangements such as staggered, orthogonal, and the like. When it is desired to change the array density, a method of positively increasing the density only in the end region may be adopted.
By changing the shape of the base in various ways, it is possible to satisfy various requirements of products. For example, 1.0m × 180
A base 71 in which approximately 3500 holes H having a diameter of 0.5 mm are formed at substantially equal intervals in an area of mm (the size range of the region where the holes H of the base is provided occupies 90% of the area of the base 71).
(See FIG. 11A), a base 72 in which the density of the holes H is increased only in the peripheral portion 72a (see FIG. 11B), and a base 73 in which the density of the frame-shaped portion 73a is increased so as to form a grid-shaped region. FIG.
1 (c)), a base 7 having slits (linear through-grooves) 74a to 74c formed in parallel with the short direction in addition to the large number of holes H.
4 (see FIG. 11 (d)), a base 75 having a slit (linear through groove) 75a formed in the center in the longitudinal direction in addition to the large number of holes H (see FIG. 11 (e)). In addition, a hole H is provided in a corresponding portion for forming a hollow portion such as a base 76 (see FIG. 11 (f)) in which a slit (linear through groove) 76a is formed in a position close to a side in the longitudinal direction. Bases 77 (see FIGS. 11 (g) and 11 (h)) provided with rectangular guide members (pipe etc.) 77a and 77b which form regions 77c and 77d which are not formed and extend downward at the lower part of the regions. Numerous specifications are feasible. The density of the holes H formed in the die is preferably 1 to 5 holes / cm ² .

(Method of Manufacturing Reproduced Sound Absorbing Building Material) The recycled sound absorbing building material 1 is manufactured as follows. First, the recycled PET bottle flakes are heated and dried to prevent hydrolysis, and an agent for improving the finish, an antibacterial agent, or the like may be appropriately added thereto. When the filament descends flat from the base 34, it is spirally wound by the winding action of the endless members 12, 13 of the endless conveyors 14, 15. It winds in from the place where it hits the surface of the endless members 12 and 13 at the time of winding. The entrained portion has a high density, and the unengaged portion has a low density.

Next, as shown in FIG. 6, the molten thermoplastic resin is extruded downward from a plurality of dies 33, and is naturally lowered between a pair of endless conveyors 14 and 15 which are partially submerged. When the recycled sound-absorbing building material 1 which is a three-dimensional network-like structure is manufactured by taking it late, a pair of endless conveyors 14,
The gap between the endless conveyors 15 and 15 was narrow, and both or one side of the aggregate of the molten resin was brought into contact with the endless conveyors 14 and 15 before and after the endless conveyors 14 and 15 were submerged.

The surfaces of both sides or one side of the melted thermoplastic resin aggregate fall onto the endless conveyors 14 and 15 and move inside the melted thermoplastic resin aggregate to form a dense state. The porosity is smaller than that of the central part that falls as it is in water. As a matter of course, the surface portion where the porosity is low has a larger number of intersections than the central portion where the porosity is high, and the tensile strength is significantly increased. Also,
The surface portion having a low porosity has a small area of the void portion, and becomes a fine soundproof layer.

In order to function as a sound-absorbing building material, the total porosity is 80% or more, depending on the local construction conditions used.
The result was that the porosity range of 98% was good. That is, it is considered that the sound is blocked when the density is high. In order to exhibit a sufficient function as a recycled sound-absorbing building material, it was found that the porosity should be at least 80% or more. That is, when the porosity was smaller than 80%, the soundproofing effect did not improve as expected. Regarding the porosity, depending on the use of the recycled sound-absorbing building material 1,
% In the range of 98% to 98%.

The surface portion of the sound absorbing building material has a low porosity, and is approximately several mm from the surface at a distance of 1 to 3 times the diameter of the filament. Due to the structure of the recycled sound-absorbing building material 1 of the present invention, the surface portion has a dense line, and there are portions where the lines overlap each other. If the porosity is 98% or less, three lines are used. The overlapping part was confirmed to the extent. The line diameter is the diameter of the line forming the recycled sound-absorbing building material 1 when the cross section is circular, and when the cross section is not circular such as a square, the cross section is assumed to be circular. And the diameter obtained from the cross-sectional area.

The thermoplastic resin used here is P
The ET bottle is crushed and made into flakes as a raw material or a main raw material. There is no problem as long as the resin can be processed by an ordinary extruder, such as a blend of a main material with a polymer.

In the step of forming the deformed three-dimensional net into a product shape, the internal pressure of the die is made uniform, and the take-up surface is taken up on two, three, four, or intermediate portions. This enables an apparent density of 0.02 to 0.9 g / cm ³ , makes the melted filament a flat shape from a disordered spiral shape, and a three-dimensional structure of the front surface, rear surface, left end surface, and right end surface in the thickness direction. It is characterized in that the surface of the net-like structure has a flat, uneven shape. A round bar with a die shape for forming a three-dimensional network
A variety of three-dimensional net-like structures can be obtained by combining shapes such as irregular shapes (pipe, Y-shape) and their combinations. Further, the three-dimensional net-like structure is made into a sheet structure of an ultra-dense structure by roller compression of a take-off machine. The uniformity of the internal pressure of the dies so that the recycled PET resin is uniformly discharged from the dies, and the contact with the take-off conveyor that forms the shape of the molten resin extruded on the three or four sides of the aggregate when the three-dimensional or net-like sheet is manufactured. I did it. That is, the aggregate of the melted recycled PET resin is formed into a shape corresponding to the product shape on three or four surfaces. For example, if necessary, a resin aggregate is taken on a polygonal conveyor or the like to form a product. As one method of obtaining a three-dimensional net-like sheet, a three-dimensional net-like sheet is produced by extruding a plurality of dies of molten resin downward, and naturally descending between a water surface or a partially submerged conveyor to create a disordered spiral shape. Becomes Sheet width 1.0m, thickness 100
In the case of mm, it was confirmed that the density changed by changing the speed of the endless conveyor to confirm that the density changed. Furthermore, it was confirmed that the density changed with the change of the discharge amount of the extruder.

In a single screw extruder having a screw diameter of 75 mm, a die 34 having an area of 1.0 mx 180 mm and a die 34 having a diameter of 0.5 mm and having approximately 3500 holes H at approximately equal intervals are placed. Attached. Approximately 1 below the dice 33
A water tank 18 having a water level at a position of 20 mm is installed.
A pair of 2 m endless conveyors 14 and 15 were installed at an interval of 50 mm and almost vertically so that the upper portions of the endless conveyors 14 and 15 came out of the water surface by about 40 mm.

With this apparatus, the temperature of the die 33 is controlled by controlling the temperature of the die 33 so that the resin temperature becomes 240 ° C. while heating and plasticizing the recycled PET resin.
The assembly of the molten resin that came out of the die 34 with an extrusion amount of kg was extruded between the endless conveyors 14 and 15 so that both surfaces of the assembly fell down. At this time, the take-off speed of the endless conveyors 14, 15 was 0.7 m / min. The molded product that has been moved downward by being sandwiched between the endless conveyors 14 and 15 changes its direction at the lower part of the water tank 18 and moves from the side opposite to the extruder to the water surface,
The water was blown off with compressed air or a vacuum pump at the time of leaving the water tank 18.

The three-dimensional network structure thus obtained has a width of 1.0 m, a thickness of 50 mm, and a density of 0.07.
g / cm ³ ~0.14g / cm ³ was obtained.

(Example of construction) It is used in place of the styrofoam 100 and the sound absorbing material 133 as shown in FIGS.
As for the use, there are many apartment floors and the like, but it is not limited. In a big city apartment, concrete is struck, and a floor is made on it like this. It makes it difficult for the impact sound to be transmitted downstairs.

(Comparison between Example and Comparative Example) The sound absorbing material described in the prior art applied to the dry type sound insulating double floor was adopted as a comparative example, and the impact sound absorbing property was compared with the example. According to the present embodiment, sound absorption performance equal to or higher than that of glass wool was obtained, and the cost was reduced by half. Although the embodiment does not have a hollow portion, it is considered that the sound absorption is improved by forming a hollow hole and forming an air layer therein and appropriately inserting a recycled material.

According to the reconstructed sound-absorbing construction material 1 described above, the sound-absorbing effect comparable to other materials can be obtained while being able to conform to the standard of floor impact noise of public institutions. This is because sound waves are effectively attenuated by the density of the filaments. It is considered that if the density of the peripheral portion is increased and the density of the central portion is relatively reduced, the sound is confined in the central portion, and it is considered that sound leakage from the lateral direction can be effectively prevented.

It is considered that the present embodiment can be used as a sound-absorbing construction material for PET bottles which are not currently used, and that the recovery rate of PET bottles is increased. Thereby, PE
The recycling of T bottles is greatly promoted.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified without departing from the technical idea of the present invention. , Equivalents and the like are also included in the technical scope of the present invention.

[0046]

According to the first to third aspects of the present invention, it is possible to provide a recycled sound-absorbing building material whose floor sound absorbing property is equivalent to that of a nonwoven fabric and the like and the cost is substantially reduced by half, and the industrial use for the housing industry is provided. The value is extremely large.

[Brief description of the drawings]

FIG. 1 is a perspective view of a recycled sound-absorbing building material according to a first embodiment of the present invention.

FIG. 2A is a longitudinal sectional view of a recycled sound-absorbing building material according to a second embodiment of the present invention, FIG. 2B is a longitudinal sectional view of a recycled sound-absorbing building material according to a third embodiment, and FIG. A longitudinal section of a sound absorbing building material, (d) is a longitudinal section of a reproduced sound absorbing building material of a sixth embodiment,
(E) is a longitudinal sectional view of the recycled sound-absorbing building material of the seventh embodiment,
(F) is a longitudinal sectional view of the recycled sound-absorbing building material of the eighth embodiment,
(G) is a longitudinal cross-sectional view of the regenerated sound-absorbing building material of the ninth embodiment,
(H) is a longitudinal section of the reproduction sound-absorbing building material of 10th Embodiment.

FIG. 3A is a longitudinal sectional view of a reproduced sound-absorbing building material of an eleventh embodiment, and FIG. 3B is a side view of the reproduced sound-absorbing building material of the eleventh embodiment.

FIGS. 4 (a) to (g) are cross-sectional views of a recycled sound absorbing building material according to a fifth embodiment of the present invention.

FIG. 5 is a perspective view of a two-sided molded sound-absorbing building material manufacturing apparatus according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an operation state of the recycled sound-absorbing building material manufacturing apparatus according to the embodiment of the present invention.

FIGS. 7 (a) and 7 (b) are a side view and a front view of an endless conveyor of the production apparatus for producing regenerated sound-absorbing material.

8 (a) to 8 (f) are side views of the recycled sound absorbing building material manufacturing apparatus and an endless conveyor of a modified embodiment.

9 (a) is a plan view of an endless conveyor of the recycled sound-absorbing building material manufacturing apparatus in the case of four-sided molding, FIG. 9 (b) is a side view of the recycled sound-absorbing building material manufacturing apparatus, and FIG. FIG. 4D is a side view of the recycled sound-absorbing building material manufacturing apparatus, FIG. 4D is a plan view illustrating four-side molding by the recycled sound-absorbing building material manufacturing apparatus, and FIG. 4E is a plan view illustrating three-side molding by the recycled sound absorbing building material manufacturing apparatus. .

FIG. 10 is a plan view of an endless conveyor of an apparatus for producing a sound-absorbing construction material having an independent drive structure in the case of four-sided molding.

11A to 11H are a plan view and a front view showing various forms of a die base.

FIG. 12 is a perspective view illustrating a conventional technique.

FIG. 13 is a plan view illustrating another related art.

FIG. 14 is a partially enlarged cross-sectional view of another related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Regenerated sound-absorbing building material, 2 ... Regenerated sound-absorbing building material, 3 ... Regenerated sound-absorbing building material, 4 ... Regenerated sound-absorbing building material, 6 ... Regenerated sound-absorbing building material, 6A, 6B ... Hollow part, 7 ... Regenerated sound-absorbing building material, 7
A, 7B: hollow portion, 7C, 7D: recycled member, 8: recycled sound-absorbing building material, 8A, 8B, 8C: beam, 10: recycled sound-absorbing building material manufacturing apparatus, 11: extrusion molding machine, 12, 13: endless member, 1
4, 15 ... endless conveyor, 14a ... sprocket, 14
b: drive shaft, 14c: sprocket, 14d: driven shaft,
15a: sprocket, 15b: driven shaft, 15c: sprocket, 15d: driven shaft, 16: drive motor, 17:
Transmission: 18: water tank, 19: control device, 31: container, 32: raw material supply port, 33: die, 34: base, 5
0: Reproduced sound absorbing building material manufacturing apparatus, 54, 55: Endless conveyor, 54a, 55a: Rotating shaft, 54b, 54c: Bevel gear, 56, 57: Roller, 56a, 57a: Rotating shaft, 5
6b, 57b ... bevel gear, 58a, 58b ... bearing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 1/64 E04B 1/64 E G10K 11/162 G10K 11/16 A 11/16 D

Claims (5)

[Claims] 1. A regenerative sound-absorbing material comprising a regenerative thermoplastic resin as a raw material or a main raw material, wherein a plurality of filaments are entangled spirally and randomly and partially heat-bonded to form a three-dimensional network-like structure. Building materials. 2. One side, both sides, of the three-dimensional network structure,
The recycled sound-absorbing building material according to claim 1, wherein the density on the surface side of one of the three or four sides is relatively lower than the density of a portion excluding the surface side. 3. The three-dimensional network structure according to claim 2, wherein the density of the surface side and the intermediate portion on one of the three or four sides is relatively lower than the density of the portion excluding the surface side. The reclaimed sound-absorbing building material described. 4. A three-dimensional network structure in which a recycled thermoplastic resin is used as a raw material or a main raw material, and a plurality of filaments are entangled helically and randomly with a sheet and partially heat-bonded. The recycled sound-absorbing building material according to claim 1. 5. At least one of an endless member provided with an endless member which is extruded downward from a die having a plurality of holes and is partially submerged, by a molten filament made of a recycled thermoplastic resin as a raw material or a main raw material.
When the three-dimensional mesh-like structure is manufactured by lowering naturally between the endless conveyors and drawing the filaments slower than the descending speed, the distance between the endless conveyors is determined by the width of the aggregate of the extruded filaments. Wherein the endless member is set to be narrow, and at least one surface of the aggregate of the filaments contacts the endless member before and after the endless member is submerged.