JP4289711B2 - Piping material with excellent soundproofing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a piping member having excellent soundproofing properties, and particularly relates to a pipe member whose outer periphery is surrounded by a soundproofing material.
[0002]
[Prior art]
Conventionally, in order to reduce noise generated from piping members during water supply and drainage, the outer periphery of a pipe body made of a resin pipe or the like is surrounded by a soundproofing material. The soundproofing material is generally composed of a sound absorbing layer made of foamed resin or glass wool and a sound insulating layer made of vinyl chloride resin, rubber or metal (aluminum, lead, etc.).
[0003]
Some piping members, such as joints, are bent or deformed into various shapes depending on the piping location. Therefore, in order to be able to stack the soundproof material on the tube body of these various shapes, as shown in FIG. 4 and FIG. Alternatively, as shown in FIGS. 6 and 7, a soundproof material 75B cut into a predetermined developed shape is placed on the outer surface of the pipe body 71, and an adhesive tape or the like is attached to the mating portions 76A and 76B of the soundproof materials 75A and 75B. The soundproofing materials 75A and 75B are fixed.
[0004]
However, it is often the case that a gap is easily generated in the mating portions 76A and 76B of the soundproofing materials 75A and 75B, and a sufficient soundproofing effect cannot be obtained. Further, even when a tape is applied to the mating portions 76A and 76B without any gaps, the tape peels off during long-term use after the construction of the piping member 10, and the mating portions 76A and 76B of the soundproofing materials 75A and 75B are opened to provide soundproofing performance. May decrease.
[0005]
Moreover, the joint part of the piping member has various shapes such as an elbow shape bent as shown in the figure and a Y-shaped shape (not shown) having a bifurcated shape, and the soundproofing material is complicated accordingly. Therefore, it is not easy to correctly stack the soundproof material on the outer surface of the piping member, and it is also difficult to close the mating portion of the soundproof material without a gap.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above points. Even when a piping member is bent such as a pipe joint, the outer surface of the pipe body can be covered with a soundproofing material without a gap, and the mating part of the soundproofing material can be used even after long-term use. The piping member which does not produce the malfunction which opens is excellent and is excellent in soundproofing.
[0007]
[Means for Solving the Problems]
That is, the invention of claim 1 surrounds the outer peripheral surface of the tube main body, the inner foam layer surrounding the outer peripheral surface of the tube main body, the foamed resin surrounding the outer peripheral surface of the pipe main body. Ri Na more integrally molded polyurethane outer resin layer with an intermediate foam layer outer peripheral surface, the intermediate foam layer are those comprising a combination of the formed half cylindrical shape so as to be in close contact with the outer surface of the tube body, or It is composed of a cut and unfolded shape laminated on the outer peripheral surface of the tube body, and the polyurethane outer surface resin layer is made of a foam, and the foam collapses into a dense film near the surface. A piping member having excellent soundproofing properties with a foaming density of 5 to 500 kg / m ³ , a surface hardness (Asker C) of 30 to 80, a tensile strength of 0.5 to 5 kgf / cm ² and an elongation of 50 to 300%. Concerning.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a piping member excellent in soundproofing according to one embodiment of the present invention, FIG. 2 is a cross-sectional view schematically showing the piping member at the time of molding, and FIG. 3 shows another example of the piping member. It is a perspective view.
[0009]
A piping member 10 according to an embodiment of the present invention shown in FIG. 1 and below is an elbow-shaped joint portion particularly used as a connection portion of a water supply / drainage pipe, and includes a pipe body 11, an intermediate foam layer 20, and a polyurethane outer surface resin. It consists of layer 30.
The pipe body 11 is a tubular body whose inside is a flow channel, and is made of vinyl chloride resin (PVC) or the like due to its strength and cost, and the pipe body 71 shown in FIGS. It consists of the same shape.
[0010]
The intermediate foam layer 20 is formed so as to surround the outer peripheral surface of the tube main body 11, and it is preferable to use a foamed material such as polyethylene or polyurethane having excellent sound absorption. The intermediate foam layer 20 of this example is formed of the same shape as the half-shaped soundproof material 75A described in the section of the prior art, and is formed in a predetermined shape so as to be in close contact with the outer surface of the pipe body 11 in advance. It is made of resin and has a thickness of about 4 mm. The intermediate foam layer 20 has a developed shape that is cut into a shape similar to that of the soundproof material 75B of FIGS. These are appropriately selected and used. The piping member 10A shown in FIG. 3 is obtained by laminating a developed intermediate foam layer 20A on the outer peripheral surface of the pipe body 11.
[0011]
In addition, since the said intermediate | middle foamed layer 20 is not exposed to the outer surface of the piping member 10, it is still more preferable if it shall be shape | molded by what consists of a recycled material. For example, defective products of various foam molded products and pulverized products (chips) such as surplus parts (so-called burrs) generated during the molding are mixed with a binder that cures with moisture or the like, and the mixture is put into a predetermined mold. Filling and curing the binder, and bonding the pulverized product in a desired shape. In this case, a pulverized product having a particle size of 0.2 mm or less, preferably 0.2 mm to 0.05 mm is suitable. Further, the intermediate foam layer 20 may be a set of halved cylindrical bodies formed by hot pressing a foam slab.
[0012]
Further, as the binder, a known one-pack type urethane binder composed of a prepolymer having a terminal NCO formed by a reaction between a polyol and a diisocyanate is suitable. A product that can be used as this urethane-based binder includes the trade name Samprene BD-1 (manufactured by Sanyo Chemical).
[0013]
The outer surface resin layer 30 protects the intermediate foam layer 20 and enhances soundproofing properties, and is made of a polyurethane resin integrally molded so as to surround the outer peripheral surface of the intermediate foam layer 20. The outer surface resin layer 30 may be a non-foamed material instead of a foam depending on the use of the piping member 10 or the piping location. In this example, the density is about 50 kg / m ³ and the thickness is about 6 mm. The polyether-based polyurethane foam. In particular, the outer surface resin layer 30 is preferably a polyurethane resin having the following physical properties in order to make it difficult to be damaged even if it is rubbed or bumped when the piping member 10 is constructed. That is, a foaming density of 5 to 500 kg / m ³ , a surface hardness (Asker C) of 30 to 80, a tensile strength of 0.5 to 5 kgf / cm ² and an elongation of 50 to 300% are particularly preferable (test method JIS K 6401, According to JIS K 6301.)
[0014]
Furthermore, it is preferable that the outer surface resin layer 30 is made of a foam having a coating 31 integrally formed on the surface thereof. If it does so, while being able to obtain still higher sound insulation property, the damage prevention property of the piping member 10 outer surface can be improved, and also handling property becomes easy. Examples of the coating 31 include a foam in which cells are crushed near the surface to form a dense film.
[0015]
The piping member 10 having the above structure does not have a mating portion on the outer resin layer 30, and there is no adhesive tape or the like that closes the mating portion. The soundproofing effect and durability can be exhibited.
[0016]
Next, an embodiment of a method for manufacturing the piping member 10 will be described.
First, the outer peripheral surface of the pipe body 11 is surrounded by an intermediate foam layer 20 made of a foamed resin having a predetermined shape. This work is carried out by using the intermediate foam layer 20 formed in the half-cylindrical shape similar to that shown in FIGS. To cover. At this time, if the outer peripheral surface of the pipe body 11 is surrounded by the intermediate foam layer 20, the workability after that can be improved by partially temporarily fixing the mating surface with an adhesive tape or the like to keep the shape. Moreover, you may apply | coat the adhesive agent to the outer peripheral surface of the pipe | tube main body 11 in the shape of a dot.
[0017]
Next, as shown in FIG. 2, the intermediate foam layer 20 and the pipe body 11 are arranged in a lower mold 51 of a predetermined mold 50, and the outer peripheral surface of the intermediate foam layer 20 is molded between the cavity surface 52. The space S is retained so as to remain. The molding space S is a space for forming the outer surface resin layer 30. The mold 50 is preferably provided with appropriate holding means for positioning and locking and holding the intermediate foam layer 20 and the pipe body 11. For example, a support member or the like (not shown) inserted into the tube body 11 is detachably provided. Further, if a film or the like is appropriately attached and sealed in one opening of the intermediate foam layer 20 and the tube main body 11, the polyurethane foam resin raw material P to be injected into the molding space S thereafter is contained in the tube main body 11. Filling can be surely prevented, and burrs removal work after the pipe member 10 is removed is not necessary.
[0018]
Then, a predetermined amount of polyurethane resin raw material P is filled into the molding space S in the cavity 52 of the molding die 50, the upper die 55 is closed, and the polyurethane resin raw material P is reaction-cured to form an outer periphery of the intermediate foam layer 20. The outer surface resin layer 30 made of polyurethane is formed. Of course, a method of injecting the polyurethane resin raw material P after closing the upper die 55 (so-called closed injection method) may be used. Then, if the shaping | molding die 50 is opened and a molded article will be demolded, the piping member 10 shown in the said FIG. 1 will be obtained.
[0019]
The piping member 10 thus obtained has sound insulation (including sound absorption) because the outer surface resin layer 30 and the intermediate foam layer 20 are bonded and integrated due to the adhesiveness at the time of reaction curing of the polyurethane resin raw material P. While increasing, there is no possibility that the outer surface resin layer 30 is peeled off from the intermediate foam layer 20 during construction of the piping member 10 and the handling property is improved. Further, when the polyurethane resin raw material P forms a foam, the outer surface resin that comes into contact with the cavity surface of the molding die 50 when the outer surface resin layer 30 is formed by foaming and curing in the molding space S. At the surface portion of the layer 30, foaming is inhibited and the dense film 31 is formed.
[0020]
As a method of forming the outer resin layer 30 on the outer peripheral surface of the intermediate foam layer 20, a soft polyvinyl chloride resin is injected into a mold by injection molding often used for molding of a thermoplastic plastic, and the outer surface made of soft PVC is used. A method of forming the resin layer on the outer periphery of the intermediate foam layer 20 is conceivable. However, in that case, the following problems occur. That is, the soft PVC injected into the mold by injection molding is heated and in a molten state, but has an extremely high viscosity as compared with the liquid polyurethane resin raw material P. Therefore, in the injection molding, the soft PVC is filled in the mold with an injection pressure much higher than the pressure at the time of the injection of the polyurethane resin raw material P, and the mold is formed by the soft vinyl chloride resin filled with the high injection pressure. The inner foam layer 20 is crushed and thinned to form a piping member. As a result, the sound absorption performance by the intermediate foam layer 20 is lowered, and good soundproof performance of the piping member cannot be obtained.
[0021]
On the other hand, in the present invention, the polyurethane outer surface resin layer 30 is integrally formed by injection molding of the polyurethane resin raw material P, which has a lower injection pressure than that of injection molding, so that the intermediate foam layer 20 is formed as compared with the case of injection molding. Since it is hard to be crushed and it is hard to become thin, the piping member 10 which exhibits a favorable soundproofing effect is obtained.
[0022]
In the above-described embodiment, the pipe member 10 has been described by taking a bent joint portion as an example. However, the present invention is not limited to this and is naturally applicable to a straight pipe member.
[0023]
【The invention's effect】
As described above, according to the piping member excellent in soundproofing according to the invention of claim 1, the outer surface resin layer made of polyurethane in which the outer peripheral surface of the intermediate foam layer surrounding the tube main body is integrally formed on the outer peripheral surface Since there is no seam or gap on the surface of the outer resin layer and the tube body is completely covered, extremely high soundproofing (including sound absorption) can be obtained. In addition, the adhesive tape does not block the mating part on the surface of the soundproofing material as in the past, so there is no risk of the adhesive tape being peeled off and the soundproofing material mating part opening, and it will exhibit good soundproofing properties over a long period of time. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a piping member excellent in soundproofing according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically showing when the piping member is molded.
FIG. 3 is a perspective view showing another example of a piping member.
FIG. 4 is a perspective view showing an example of a conventional piping member.
5 is an exploded perspective view of the piping member shown in FIG. 4. FIG.
FIG. 6 is a perspective view showing another example of a conventional piping member.
7 is an exploded perspective view of the piping member shown in FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Piping member 11 Pipe main body 20 Intermediate foam layer 30 Outer surface resin layer 31 Surface coating 50 Foaming mold P Polyurethane resin raw material

Claims (1)

It is integrally formed with the pipe body whose inside is a flowing water channel, the intermediate foam layer made of foamed resin surrounding the outer peripheral surface of the pipe main body, and the outer peripheral surface of the intermediate foam layer so as to surround the outer peripheral surface of the intermediate foam layer Na more and polyurethane outer resin layer is,
The intermediate foam layer is composed of a combination of halved cylindrical shapes formed so as to be in close contact with the outer surface of the tube body, or a laminate of cut expanded shapes on the outer peripheral surface of the tube body. And
The polyurethane outer resin layer is made of a foam, and the foam has a film in which cells are crushed near the surface to form a dense film, and has a foam density of 5 to 500 kg / m ³ and a surface hardness (Asker C) of 30. A piping member excellent in soundproofing , comprising 80 to 80, tensile strength of 0.5 to 5 kgf / cm ² and elongation of 50 to 300% .

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