KR100520128B1 - A muti-layer pipe of having a good nise control property, and its making method - Google Patents

Abstract

The present invention relates to a pipe that significantly reduces the noise of the drain pipe installed in the bathroom and toilet of the apartment house in recent years, and more particularly, the noise generated when draining while having the same drainage capacity and chemical resistance as the conventional hard vinyl chloride PIPE. The pipe is excellent in its ability to block vibrations.

More specifically, it is composed of three layers having different properties from the conventional PIPE, and each layer is designed to have an optimal effect in order to reduce noise and vibration. In particular, the middle layer of the three different layers has the form of a flexible foam excellent in sound insulation and dustproof effect. In this case, the flexible foam layer may be composed of a PVC resin (RESIN), a plasticizer, and a filler having sound insulation and dustproof function, but if necessary, foam materials such as synthetic rubber, natural rubber, and thermoplastic polyurethane may be used. . In addition, if the combination of the soundproof and dustproof layers produced by the product structure and the flexible foam layer can be applied to materials such as polypropylene, polyethylene, as well as vinyl chloride resin.

Description

Multi-layer pipe with excellent noise shielding function and its manufacturing method {A MUTI-LAYER PIPE OF HAVING A GOOD NISE CONTROL PROPERTY, AND ITS MAKING METHOD}

The present invention relates to a multi-layered pipe that minimizes noise and vibration generated when a fluid moves by using vinyl chloride material having different characteristics.

Pipes manufactured using vinyl chloride resin are used for drain pipes in various fields because of their low cost, easy construction and excellent chemical resistance. However, when the existing general drain pipe material (VG2 on KS M 3401) is used as a piping material for apartment houses, the level of drainage noise causes building tenants to suffer mental and physical pains such as decreased work efficiency and disturbed sleep. In serious cases, it is a cause of dispute between the tenant and the construction company.

In order to solve this problem, in the case of drainage granules in a residential building, a sound absorbing material such as fiberglass or rock wool or a method such as styropol or urethane foam is used to wrap the drainage pipe to reduce noise emitted through the pipe. However, this method has a disadvantage in that the construction cost is high compared to the noise attenuation effect, and a lot of effort is required to wrap the drain pipe, and the noise attenuation effect is also made only in the mid and high ranges of 250 Hz or higher, There is no effect, so the actual effect is small.

On the other hand, in order to improve this, Japanese Laid Open Patent P2002-188788A provides a soundproof sheet for piping having a triple structure having a sound absorbing layer, an adhesive layer, and a soundproofing layer to surround the outside of the pipe piping. In more detail, in the case of the soundproof layer, although not particularly limited, a known high-density filler for soundproofing such as calcium carbonate, magnesium oxide, alumina, barite, iron oxide, etc. may be mixed with the vinyl chloride resin or the olefin resin. In the case of the sound-absorbing layer, a foam is formed using a resin such as urethane, chloroprene, styrene butadiene copolymer, polypropylene, ethylene vinyl acetate, or a fiber aggregate such as nonwoven fabric or felt may be used. In this case, the sound insulation and sound absorption characteristics of various sound ranges can be improved, but it is not possible to solve the problem of improving workability because the sheet must be adhered to the installed pipe after the pipe installation work. As a result, it is not suitable as a soundproofing material for drainage pipes for apartment houses, which has a great utility value.

On the other hand, as a method for improving the sound insulation function while improving the workability, Republic of Korea Patent Publication No. 2002-0080220 provides a pipe in close contact with a soft vinyl chloride material filled with a high specific gravity filler known to suppress noise on the existing pipe surface Doing. In more detail, the soft vinyl chloride layer (Special Special Chloride) is used to reduce noise by adding calcium carbonate and other inorganic fillers and plasticizers to reduce noise in existing hard vinyl chloride pipes (or polyolefin resin layers). Stratification), which can reduce the radiated noise generated when the fluid moves through the rigid vinyl chloride pipe, but the sound insulation technology through minimizing the generated vibration, which is one of the key technologies of noise shielding, is used. It can be seen that it is not. In addition, in order to secure the properties of the basic KS standard, since the dimensions of the internal rigid vinyl chloride pipe cannot be changed, the weight was heavy due to the addition of a soft vinyl chloride layer. Of course, the soft vinyl chloride sound insulating material may be closely adhered to the inner wall of the pipe to absorb vibration and reduce radiation noise. However, in the case of soft vinyl chloride, due to its weak chemical resistance, It can be easily damaged and the thickness of the soft vinyl chloride resin layer adhered to the inside of the pipe is thickened to increase the noise reduction effect. The only way to reduce this would be to have a noise shielding material adhere to the pipe's outer wall.

The present invention invents a material that can minimize the radiation noise generated when moving the fluid that can be most effective in reducing noise and the vibration generated according to the problem to solve the above problems and the pipe for the drainage with the optimal structure An attempt was made to provide a pipe of a multi-layer structure introduced in.

It is therefore an object of the present invention to provide a pipe (pipe) with significantly improved noise generation.

The present invention also aims to minimize vibrations and noises when fluids are conveyed without disrupting the transport of the fluids while having an improvement of not attaching a separate noise shielding material at the construction site as described above.

In order to achieve the above object, the inventors of the present invention had the main problem of adjusting the viscoelasticity so as to maximize the damping ratio and minimize the emission of noise measured in a rigid vinyl chloride pipe composed of one layer. For this purpose, it was found that a multilayered structure is more suitable than a single layered structure.

The multi-layered pipe of the present invention has a structure including an inner wall layer, an intermediate layer, and a foam layer.

As the inner wall layer or the outer wall layer, a hard vinyl chloride resin layer in which a vinyl chloride resin is filled with a high specific gravity filler of 2 or more specific gravity is used. High specific gravity fillers are used to improve the noise damping properties of the pipe, talc, barium sulfate, silica, calcium carbonate, glass fiber, and the like as a filler having a specific gravity of 2 or more. The content of the high specific gravity filler included in 100 parts by weight of the base resin (vinyl chloride resin) is preferably about 3 to 50 parts by weight. In addition, a plasticizer may be added to the base resin to form a rigid layer instead of the hard layer. The plasticizer contains about 5-25 parts by weight. On the other hand, the base resin may be used in addition to the vinyl chloride resin, polypropylene or polyethylene resin.

The intermediate layer between the outer wall layer and the inner wall layer is a flexible foam layer in which a vinyl chloride resin is contained and foamed with a plasticizer, a high specific gravity filler having a specific gravity of 2 or more, and a foaming agent. High specific gravity fillers include talc, barium sulfate, silica, calcium carbonate, and glass fibers, as in the outer and inner wall layers. The content of the high specific gravity filler included in 100 parts by weight of the base resin (vinyl chloride resin) is preferably about 1 to 60 parts by weight. On the other hand, it is preferable that the plasticizer added to a base resin uses 15-150 weight part plasticizers. The blowing agent is a decomposable blowing agent or a solvent blowing agent. As the decomposing blowing agent, a sulfonyl blowing agent such as a nitro-based blowing agent, a sulfonyl-hydradit compound, or an azo-based blowing agent is used. Most preferably, an azo blowing agent having excellent cost effectiveness is used. About 0.1 to 1 part by weight of blowing agent is used based on 100 parts by weight of the base resin. On the other hand, polypropylene, polyethylene, ultra low density ethylene, ethylene vinyl acetate, ethylene methyl acrylate and the like are also used as the foam. Instead of polyvinyl resin, synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene, ethylene vinyl acetate, and the like are also used. Meanwhile, an intermediate layer, which is a soft layer in which a high specific gravity filler and a plasticizer having a specific gravity of 2 or more, is added to the vinyl chloride resin may also be used.

In addition, an air layer may be further formed between the pipe inner wall layer and the middle layer in the multilayer pipe to further reduce noise.

According to a preferred embodiment of the present invention, the multi-layered pipe of the present invention is a vinyl chloride resin filled with a high specific gravity filler of 2 or more specific gravity, a plasticizer, a high specific gravity filler of 2 or more specific gravity and a foaming agent is contained in the vinyl chloride resin An intermediate layer, which is a foamed flexible foam layer, and an outer wall layer in which a vinyl chloride resin is filled with a high specific gravity filler of 2 or more specific gravity.

According to another preferred embodiment of the present invention, the multi-layered pipe of the present invention is an inner wall layer filled with a vinyl chloride resin with a high specific gravity filler of 2 or more specific gravity, synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene, ethylene vinyl acetate And an intermediate layer, which is a flexible foam layer in which a foaming agent is contained and foamed in a flexible foam selected from the group consisting of mixtures thereof, and an outer wall layer filled with a high specific gravity filler having a specific gravity of 2 or more in a vinyl chloride resin.

 According to another preferred embodiment of the present invention, the multi-layered pipe of the present invention is an inner wall layer filled with a polypropylene or polyethylene resin with a high specific gravity filler of 2 or more specific gravity, polypropylene, polyethylene, ultra low density ethylene, ethylene vinyl acetate, ethylene methyl A base layer selected from the group consisting of acrylates and mixtures thereof, a soft foam layer containing a plasticizer, a high specific gravity filler having a specific gravity of 2 or more, and a foaming agent and foamed, and a high specific gravity of 2 or more in a polypropylene or polyethylene resin And an outer wall layer filled with a specific gravity filler.

According to another preferred embodiment of the present invention, the multi-layered pipe of the present invention is an inner wall layer filled with a polypropylene or polyethylene resin with a high specific gravity filler of 2 or more specific gravity, synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene , An intermediate layer which is a flexible foam layer foamed by containing a foaming agent in a flexible foam selected from the group consisting of ethylene vinyl acetate and mixtures thereof, and an outer wall layer filled with a high specific gravity filler having a specific gravity of 2 or more in polypropylene or polyethylene resin.

According to another preferred embodiment of the present invention, the multi-layered pipe of the present invention

An inner wall layer filled with a vinyl chloride resin with a high specific gravity filler with a specific gravity of 2 or more, an intermediate layer with a high specific gravity filler with a specific gravity of 2 or more with a vinyl chloride resin and a plasticizer, and a high specific gravity filler with a specific gravity of 2 or more with a vinyl chloride resin. An outer wall layer.

According to another preferred embodiment of the present invention, the multi-layered pipe of the present invention has a specific gravity of 2 or more selected from the group consisting of talc, barium sulfate, silica, calcium carbonate, glass fibers and mixtures thereof in 100 parts by weight of vinyl chloride resin A high specific gravity filler having a specific gravity of 2 or more selected from the group consisting of an inner wall layer filled with 3 to 50 parts by weight of filler, 15 to 150 parts by weight of a plasticizer, and a barium sulfate, silica, calcium carbonate, glass fiber, and mixtures thereof. 1 to 60 parts by weight and 0.5 to 1 part by weight of an azo-based foaming agent containing an intermediate layer of a flexible foam layer foamed, and 100 parts by weight of vinyl chloride resin made of talc, barium sulfate, silica, calcium carbonate, glass fiber and mixtures thereof An outer wall layer filled with 3 to 50 parts by weight of a specific gravity filler having a specific gravity of 2 or more selected from the group.

Hereinafter, the drawings will be described.

1 is a conventional straight single layer pipe structure, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. Such a straight monolayer pipe has a disadvantage in that it is inferior in noise resistance.

2 to 4 are cross-sectional views of a multi-layered pipe according to each embodiment of the present invention, where (a) is a cross sectional view and (b) is a longitudinal sectional view. In FIG. 2, the inner wall layer and the outer wall layer are hard vinyl chloride layers 10 having the same soundproofing properties, and the middle layer is a foam layer 30 having enhanced soundproofing and dustproofing properties. In FIG. 3, the inner wall layer is a semi-hard vinyl chloride layer 20 having enhanced soundproofing properties, the middle layer is a foam layer 30 having enhanced soundproofing and dustproofing properties, and the outer wall layer is a hard vinyl chloride layer having enhanced soundproofing properties. (10). FIG. 4 is a cross-sectional view of an air layer 40 further included to enhance noise protection between intermediate layers in a pipe having a multi-layered structure as shown in FIG. 3.

5 is a perspective view of a multi-layered pipe according to an embodiment of the present invention. As shown, it is strictly composed of three layers than the multilayer.

6 is an enlarged view of a foam layer which is an intermediate layer of a multilayer structure pipe according to an embodiment of the present invention. 6 is an enlarged photograph when the foam layer is enlarged at about 80 magnification in the multilayer pipe of the present invention.

7 is a schematic diagram of a manufacturing apparatus for manufacturing a multi-layered pipe according to an embodiment of the present invention. As shown, three extruders are connected to one extrusion mold. Each of the three extruders is fed with the material of each layer of the multilayered pipe of the present invention. The extrudate extruded through the first extruder forms an inner wall layer 20, the extrudate extruded through the second extruder forms an intermediate layer 30, and the extrudate extruded through the third extruder forms an outer wall layer ( 10) form. That is, the multi-layered pipe of the present invention is extruded while the material introduced into each extruder passes through an extrusion mold coupled to the extruder as an extrudate to form a multi-layered pipe.

Hereinafter, embodiments of the present invention will be described.

Example 1-5

The noise reduction effect was measured by adjusting the viscoelasticity or improving the thickness of the inner wall of the pipe by using a filler having a higher specific gravity in the same single-layer structure as the conventional hard vinyl chloride pipe as shown in FIG. 1. In more detail, the measuring method is to construct a toilet and a pipe to be evaluated on a two-story toilet in a two-story building with a height of 6M, which is the same shape as a general apartment house, on the first floor. The noise generated when the water flowed down from the toilet on the second floor was measured using a noise measuring instrument called NL-21. The unit of noise measurement is decibels (dB), and the initial noise generated when the water drops is expressed as L (A) max and the terminal average noise as L (A) eq.

Table 1 shows the noise attenuation characteristics for each material of the single-layer structure pipe when the composition and thickness of the pipe material is changed according to each embodiment. Hereinafter, the content units of the components in Table 1, Table 2, Table 3 is parts by weight.

Table 1: Noise Reduction Characteristics of Single Layer Pipes by Material

ingredient Example 1 Example 2 Example 3 Example 4 Example 5 Vinyl chloride resin 100 100 100 100 100 High specific gravity fillers 15 30 45 Compound Stabilizer 4 4 4 4 4 Product thickness (mm) 3.2 4 3.2 3.2 3.2 L (A) max (dB) 67.4 66.1 65.8 63.7 62.9 L (A) eq (dB) 61.2 59.4 58.3 56.5 56.4

( Experimental conditions:

Measuring device RION NL-21 / Calibration value 97.2

 Temperature 16 ℃ / Relative Humidity 42% / Test Pipe Aperture 100mm / Average of 3 Measurements

      Piping type: toilet piping, bathtub piping

      High specific gravity filler is used by mixing 1: 1 barium sulfate with talc of 2.7.

The complex stabilizer used consists of 40 parts by weight of tribasic red sulfate, 15 parts by weight of dibasic red stearate, 15 parts by weight of calcium stearate, 10 parts by weight of red stearate, and 10 parts by weight of paraffin wax.

As can be seen in Table 1, when Example 1 and Example 2 were compared, the thicker the product was, the lower the L (A) was. Insertion of high specific gravity fillers compared to Example 3 had a low L (A) .However, when the high specific gravity fillers were added in an amount of about 30 parts by weight compared to 100 parts by weight of the vinyl chloride resin when comparing Examples 3 to 5, I could see that it converged. In other words, the amount of filler with high specific gravity and the thickness of the inner wall of the pipe are affected, but the noise prevention effect is almost constant when the content of the high specific filler is over a certain amount.

Examples 6-11

In the pipe of the multilayer structure as shown in Figure 2, the existing rigid vinyl chloride pipe material is used for the inner and outer wall layers, and the noise reduction characteristics of the pipe manufactured by changing the material in the middle layer was observed. That is, in the intermediate layer, noise reduction is achieved by varying the amount of plasticizer to a general soft vinyl chloride material (in the case of Examples 6 and 7), or a high specific gravity filler (in the case of Examples 8 and 9) to the soft vinyl chloride material. Foamed soft vinyl chloride material with varying plasticizer content (Example 10) and high specific gravity of soft vinyl chloride material in order to observe the degree and to apply the foamed material which generally has the greatest effect on noise reduction to the inner layer. The filler was injected and foamed (Example 11) was differentiated to determine the degree of effect.

 Table 2 according to each embodiment of the pipe material of the inner wall and the outer wall is fixed with a hard vinyl chloride material, the middle layer shows the noise attenuation characteristics of the multi-layered pipe by changing the material.

Table 2: Noise Reduction Characteristics of Multi-layered Pipes According to Changes in Interlayer Materials

ingredient Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Vinyl chloride resin 100 100 100 100 100 100 High specific gravity fillers 15 30 30 Compound Stabilizer 4 4 4 4 4 4 Plasticizer 50 90 50 90 90 90 blowing agent 0.5 0.5 L (A) max (dB) 60.4 58.7 57.8 57.2 55.8 55.1 L (A) eq (dB) 54.2 53.1 52.8 52.3 50.7 49.5

 (Experimental conditions:

Measuring device RION company NL-21 / calibration value 97.2

Temperature 16 ℃ / Relative Humidity 42% / Test Pipe Aperture 100mm / Average of 3 Measurements

Piping type: toilet piping, bathtub piping

High specific gravity filler is used by mixing 1: 1 barium sulfate with talc of 2.7.

The complex stabilizer used consists of 40 parts by weight of tribasic red sulfate, 15 parts by weight of dibasic red stearate, 15 parts by weight of calcium stearate, 10 parts by weight of red stearate, and 10 parts by weight of paraffin wax.

The plasticizer uses diethyl hexyl phthalate (DOP) and the blowing agent uses azo dicarboamide (AZODICARBOAMIDE), a representative product of the azo system. )

As can be seen in Table 2, when comparing Example 6 and Example 7, it was found that the case of containing more plasticizer in the intermediate layer (Example 7) has a low L (A) value, which is excellent in noise attenuation characteristics. Compared to Example 6, Example 8, and Example 9, inserting a high specific gravity filler into the intermediate layer had excellent noise damping characteristics, and compared with Example 9, Example 10, and Example 11. In the case of foaming by inserting a foaming agent in the intermediate layer, it was found that the noise attenuation characteristics were better.

In other words, when the hardness is lowered by increasing the plasticizer without foaming, the noise reduction effect has been demonstrated. This is because the soft layer between the layers of rigid vinyl chloride is reduced in nature. The cause was found, and even when the high specific filler was added, the same noise reduction rate as in Example 1 was observed. Of course, in the case of forming a porous layer by foaming soft PVC (Examples 10 and 11), it was found that this effect is further increased.

However, in the case of the soft material introduced into the middle layer, if the hardness is too low to reduce the noise, it may be a factor to lower the inherent physical properties of the pipe used as a building material. Therefore, the plasticizer input and the high specific filler content are adjusted. Care should be taken in selecting the hardness.

Examples 12-16

In the multi-layered pipe as shown in Figs. 2 and 3 to 4, the pipe outer wall layer uses a hard vinyl chloride resin containing a high specific gravity filler having excellent radiation noise suppression characteristics, and the inner wall layer of the pipe is a conventional hard vinyl chloride pipe. Unlike materials, high-density vinyl chloride resins containing plasticizers as well as high-density fillers with excellent radiation noise suppression properties are applied (Example 13), and soft foamed materials with high-density fillers are applied to the middle layer. Various foaming ratios of the flexible foams were applied (Examples 13 to 15), and an air layer was formed between the inner wall of the pipe and the flexible foam (Example 16) to identify the noise reduction effect.

Table 3 shows that the outer wall of the pipe is fixed with a hard vinyl chloride resin containing a high specific gravity filler, the inner wall is changed to a hard vinyl chloride resin layer or a semi-rigid vinyl chloride resin layer, and the middle layer is used to change the foaming ratio according to each embodiment. Or noise attenuation characteristics of a multi-layered pipe according to the case where a separate air layer is inserted.

Table 3: Noise Reduction Characteristics of Multi-layered Pipes According to the Material Changes in the Inner Wall, the Foam Ratio of the Interlayer, and the Structure of the Interlayer

ingredient Example 12 Example 13 Example 14 Example 15 Example 16 Hard vinyl chloride resin (High specific gravity filler 30 parts by weight) Inner wall outer wall outer wall outer wall Inner wall Semi-rigid vinyl chloride resin (15 parts by weight of plasticizer, 30 parts by weight of high specific filler) inside wall inside wall inside wall Flexible Foam (150% expansion ratio) Mezzanine Mezzanine Mezzanine Flexible foam (250% expansion ratio) Mezzanine Flexible foam (350% expansion ratio) Mezzanine Basic structure 3-layer structure (Fig. 2) 3-layer structure (Fig. 3) 3-layer structure (Fig. 3) 3-layer structure (Fig. 3) Air layer (Fig. 4) L (A) max (dB) 56.2 54.4 53.4 53.1 52.8 L (A) eq (dB) 50.3 48.5 47.1 47.2 46.7

(Experimental conditions:

Measuring device RION NL-21 / Calibration value 97.2

Temperature 16 ℃ / Relative Humidity 42% / Test Pipe Aperture 100mm / Average of 3 Measurements

      Piping type: toilet piping, bathtub piping

High specific gravity filler is used by mixing 1: 1 barium sulfate with talc of 2.7.

The complex stabilizer used consists of 40 parts by weight of tribasic red sulfate, 15 parts by weight of dibasic red stearate, 15 parts by weight of calcium stearate, 10 parts by weight of red stearate, and 10 parts by weight of paraffin wax.

The plasticizer uses diethyl hexyl phthalate (DOP) and the blowing agent uses azo dicarboamide (AZODICARBOAMIDE), a representative product of the azo system. )

     The flexible foam used in the above embodiment is a high specific gravity of 100 parts by weight of vinyl chloride resin, 90 parts by weight of diethylhexyl phthalate plasticizer, 4 parts by weight of composite stabilizer, barium sulfate of specific gravity 4.5 and talc of specific gravity 2.7 in a 1: 1 ratio. After mixing 30 parts by weight of filler, the foaming agent was changed from 0.4 parts by weight to 1.2 parts by weight, and was dry-branded and co-extruded together with the inner wall and outer wall of the pipe.

As can be seen from Table 3, when comparing Example 12 and Example 13, the L (A) value is obtained when the inner wall layer is a rigid vinyl chloride resin layer by inserting a plasticizer instead of the hard vinyl chloride resin layer. It was found that the lower the lower the noise attenuation characteristics, and compared with Example 13, Example 14, and Example 15, the higher the foaming ratio of the intermediate layer, the better the noise damping characteristics to some extent, but more than about 250% In this case, it was found that almost converged, and compared with Example 12 and Example 16, when the air layer was inserted (Example 16), the noise attenuation characteristics were higher, but the workability was poor.

That is, it was effective to apply a semi-rigid material filled with a high specific gravity filler to the inner wall of the pipe (Example 13), and the expansion ratio of the flexible foam constituting the intermediate layer is about 250% to consider the extrudability and durability of the drainage pipe. The noise reduction effect was found to be the most appropriate. In addition, when the air layer was made between the inner wall of the pipe and the flexible foam, the noise reduction effect was excellent, but the extrusion workability was not so excellent, and it was judged that there was a difficulty in sealing the air layer of the pipe with watertight packing during construction. In general, when L (A) is 53dB or less, the product has excellent noise attenuation characteristics.

The above embodiments are not intended to limit the invention but are described by way of example only. Those skilled in the art will appreciate that the present invention can be easily changed or modified without departing from the spirit and spirit of the present invention as set forth in the claims appended hereto. Such modifications and variations are within the scope of the present invention.

The new low noise pipe provided in the present invention can have the same effect as attaching the sound absorbing material without wrapping the sound absorbing material for shielding the noise as in the case of the existing foreign countries, as well as low specific gravity between the inner wall and the outer wall. By incorporating the flexible foam, the company has pioneered a new field of technology that can maximize vibration damping as well as the shielding function of radiation noise, which has been tried so far to suppress noise. In addition, the application of low specific gravity ductile high foam helps to lighten the product weight and secure price competitiveness, and the outer wall of the pipe can be considered to have solved the problem of long-term durability by maintaining the mechanical properties of existing products.

1 is a cross-sectional view showing a conventional straight single layer pipe.

Figure 2 is a cross-sectional view of a multi-layered pipe excellent in noise shielding function according to an embodiment of the present invention.

3 is a cross-sectional view of a multi-layered pipe having excellent noise shielding function according to another embodiment of the present invention.

Figure 4 is a cross-sectional view of a multi-layered pipe excellent in noise shielding function according to another embodiment of the present invention.

5 is a perspective view of a multi-layered pipe according to an embodiment of the present invention.

6 is an enlarged photograph of a foam layer which is an intermediate layer of a multilayer structure pipe according to an embodiment of the present invention.

7 is a schematic view of a manufacturing apparatus for producing a multi-layered pipe according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

10: hard vinyl chloride layer

20: semi-rigid vinyl chloride layer

30: Flexible foam layer with enhanced soundproof and dustproof properties

40: empty air layer

Claims (14)

In a multilayer pipe, An inner wall layer filled with a vinyl chloride resin having a specific gravity filler of 2 or more, An intermediate layer which is a flexible flexible foam layer formed by foaming a vinyl chloride resin with a plasticizer, a high specific gravity filler having a specific gravity of 2 or more, and a foaming agent; A multi-layered pipe with excellent noise shielding function, comprising an outer wall layer filled with a high specific gravity filler having a specific gravity of 2 or more in a vinyl chloride resin. In a multilayer pipe, An inner wall layer filled with a vinyl chloride resin having a specific gravity filler of 2 or more, An intermediate layer which is a flexible foam layer formed by containing a foaming agent in a flexible foam selected from the group consisting of synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene, ethylene vinyl acetate, and mixtures thereof; A multi-layered pipe with excellent noise shielding function, comprising an outer wall layer filled with a high specific gravity filler having a specific gravity of 2 or more in a vinyl chloride resin. In a multilayer pipe, An inner wall layer filled with a vinyl chloride resin having a specific gravity filler of 2 or more, An intermediate layer composed of a soft layer in which a vinyl chloride resin is added a high specific gravity filler and a plasticizer having a specific gravity of 2 or more, A multi-layered pipe with excellent noise shielding function, comprising an outer wall layer filled with a high specific gravity filler having a specific gravity of 2 or more in a vinyl chloride resin. In a multilayer pipe, An inner wall in which polypropylene or polyethylene resin is filled with a high specific gravity filler having a specific gravity of 2 or more; Flexible foam foamed by containing a plasticizer and a high specific gravity filler and a blowing agent in a base resin selected from the group consisting of polypropylene, polyethylene, ultra low density ethylene, ethylene vinyl acetate, ethylene methyl acrylate and mixtures thereof The middle layer, which is a layer, A multi-layered pipe with excellent noise shielding function, characterized in that it comprises an outer wall filled with polypropylene or polyethylene resin with a specific gravity filler of 2 or more. In a multilayer pipe, An inner wall in which polypropylene or polyethylene resin is filled with a high specific gravity filler having a specific gravity of 2 or more; An intermediate layer which is a flexible foam layer formed by containing a foaming agent in a flexible foam selected from the group consisting of synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene, ethylene vinyl acetate, and mixtures thereof; A multi-layered pipe with excellent noise shielding function, characterized in that it comprises an outer wall filled with polypropylene or polyethylene resin with a specific gravity filler of 2 or more. In a multilayer pipe, An inner wall layer filled with a vinyl chloride resin with a high specific gravity filler having a specific gravity of 2 or more and containing a plasticizer; An intermediate layer which is a flexible flexible foam layer formed by foaming a vinyl chloride resin with a plasticizer, a high specific gravity filler having a specific gravity of 2 or more, and a foaming agent; A multi-layered pipe with excellent noise shielding function, characterized by comprising an outer wall layer, which is filled with a vinyl chloride resin, a specific gravity filler having a specific gravity of 2 or more, and a plasticizer. In a multilayer pipe, An inner wall layer filled with a vinyl chloride resin with a high specific gravity filler having a specific gravity of 2 or more and containing a plasticizer; An intermediate layer which is a flexible foam layer formed by containing a foaming agent in a flexible foam selected from the group consisting of synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene, ethylene vinyl acetate, and mixtures thereof; A multi-layered pipe with excellent noise shielding function, characterized by comprising an outer wall layer, which is filled with a vinyl chloride resin, a specific gravity filler having a specific gravity of 2 or more, and a plasticizer. In a multilayer pipe, An inner wall layer filled with a vinyl chloride resin with a high specific gravity filler having a specific gravity of 2 or more and containing a plasticizer; An intermediate layer composed of a soft layer in which a vinyl chloride resin is added a high specific gravity filler and a plasticizer having a specific gravity of 2 or more, Multi-layered pie with excellent noise shielding, characterized in that the vinyl chloride resin is filled with a high specific gravity filler having a specific gravity of 2 or more and includes an outer wall layer which is a semi-hard layer containing a plasticizer. In a multilayer pipe, An inner wall which is a semi-hard layer filled with a polypropylene or polyethylene resin with a high specific gravity filler having a specific gravity of 2 or more, and containing a plasticizer, Flexible foam foamed by containing a plasticizer and a high specific gravity filler and a blowing agent in a base resin selected from the group consisting of polypropylene, polyethylene, ultra low density ethylene, ethylene vinyl acetate, ethylene methyl acrylate and mixtures thereof The middle layer, which is a layer, A multi-layered pipe with excellent noise shielding function, wherein the polypropylene or polyethylene resin is filled with a high specific gravity filler having a specific gravity of 2 or more, and is included as an outer layer wall that is a semi-hard layer containing a plasticizer. In a multilayer pipe, An inner wall which is a semi-hard layer filled with a polypropylene or polyethylene resin with a high specific gravity filler having a specific gravity of 2 or more, and containing a plasticizer, An intermediate layer which is a flexible foam layer formed by containing a foaming agent in a flexible foam selected from the group consisting of synthetic rubber, thermoplastic polyurethane, natural rubber, styrene butadiene styrene, ethylene vinyl acetate, and mixtures thereof; A multi-layered pipe with excellent noise shielding function, wherein the polypropylene or polyethylene resin is filled with a high specific gravity filler having a specific gravity of 2 or more, and is included as an outer layer wall that is a semi-hard layer containing a plasticizer. The method according to any one of claims 1 to 10, Wherein the filler is talc, barium sulfate, silica, calcium carbonate, glass fiber and a specific gravity selected from the group consisting of a mixture of two or more of the multi-layer pipe structure with excellent noise shielding. The method according to any one of claims 1 to 10, The foaming agent is a decomposable foaming agent which is an azo foaming agent, a nitro foaming agent or a sulfonyl foaming agent or a solvent-based foaming agent, characterized in that the excellent noise shielding multi-layered pipe. The method according to any one of claims 1 to 10, Multilayer pipe with excellent noise shielding, characterized in that the air layer is further formed between the inner wall layer and the intermediate layer. Three extruders (first extruder, second extruder, third extruder) are connected to the extrusion mold to form a base resin and a high specific gravity filler having a specific gravity of at least two, and a second extruder Into the base resin and high specific gravity fillers and blowing agents having a specific gravity of 2 or more, the base resin and high specific gravity fillers having a specific gravity of 2 or more are introduced into the third extruder, and the extrudate from the first, second and third extruders passes through the extrusion mold. Extrusion molding method for producing a multi-layered pipe having excellent noise shielding, characterized in that the multi-layered pipe is formed.