KR20200119511A - Sound absorbing material and method for fabricating the same - Google Patents

Abstract

The present invention relates to a sound absorbing material including: a compression silk cotton including polyester fiber and polyester hollow fiber; and non-woven fabric including low melting fiber, wherein the compression silk cotton and the non-woven fabric are thermally bonded with a hot melt adhesive therebetween. Accordingly, it is applied to transportations such as automobiles and various home appliances causing vibration and noise such as washing machines, dryers, air conditioners, and air purifiers to absorb the noise, thereby reducing the noise and vibration of products, so that the discomfort due to the noise during use is reduced, and damages to the product due to the vibration is minimized to increase product lifespans.

Description

Sound absorbing material and method for fabricating the same}

The present invention relates to a sound-absorbing material and a manufacturing method thereof, and to a sound-absorbing material that can be applied to products that cause noise such as automobiles and household appliances, particularly dryers and washing machines, and a method of manufacturing the same.

In general, external noise is introduced into the vehicle interior through various paths to a driving vehicle. The noise generated by the friction between the tire and the ground, the high temperature of the exhaust system, and the high-pressure flue gas flow, and the engine noise generated from the engine and transmitted through the vehicle body or air are transmitted to the ears of the passengers, thereby hindering the quiet feeling of the vehicle. . In order to suppress engine transmission noise, an engine cover or hood insulator is generally used, but there is a limit to removing engine transmission noise to a desired level by itself.

Therefore, the vehicle is equipped with sound-absorbing materials on the front, left side, and floor. For example, the sound-absorbing material is installed on the dash panel separating the engine room from the vehicle compartment to block noise generated from the engine room, and noise flowing through the side of the vehicle body. Sound-absorbing material is also attached to the side panel to block the protection.

Conventionally, as a material used as such a sound absorbing material, glass fiber, urethane foam, and miscellaneous felt are used. In the case of urethane foam, which is mainly used, the smell is toxic, and there is a concern that toxic gases may be generated in case of an accident due to flammability, and when the foam thickness is thin, there is a problem that it is difficult to mold.

On the other hand, in a washing machine, which is one of the essential home appliances, vibration is inevitably generated by rotation because a drum mounted therein is driven by a motor to rotate and operate. Moreover, the laundry received inside the drum and washed is not fixed at a certain position and is not evenly distributed. Accordingly, vibration is further generated by the unbalanced mass of the laundry. Excessive vibrations may cause gaps or breakdowns in various devices installed inside the washing machine, which significantly affects the life of the washing machine, and is also a major cause of noise generated by the washing machine.

In addition, home appliances including a compressor, such as a laundry dryer and an air conditioner, generate vibration and noise while the compressor compresses and circulates the refrigerant during operation. Since the home appliance is used inside a home, a device for suppressing such vibration or noise is essential, and for this purpose, a sound absorbing material is installed on the outside of the compressor during the manufacturing process of a clothes dryer or air conditioner.

The existing sound absorbing material is installed by placing an asphalt sheet or an ethylene-vinyl acetate copolymer (EVA) sheet on the outer surface of the dishwasher where only the outer panel is installed, and applying heat through a hot air fan to the dishwasher. After the sheet has adhesiveness, a nonwoven fabric having sound-absorbing properties is attached.

Therefore, it can be applied to various products that cause noise, such as automobiles and home appliances, especially washing machines and dryers, and can be firmly attached to curved parts, and development of a sound absorbing material with improved sound absorption performance is required.

Korean Patent Registration No. 10-1919855 Korean Patent Registration No. 10-1526953

An object of the present invention is to provide a sound-absorbing material that can be applied to various products that cause noise, such as automobiles, home appliances, in particular dryers and washing machines, can be firmly attached to bent portions, and has improved sound-absorbing performance, and a method for manufacturing the same. .

According to an aspect of the present invention,

Compression cotton including polyester fiber and polyester hollow fiber; And a non-woven fabric including a low melting fiber, wherein the compression cotton and the non-woven fabric are thermally bonded through a hot melt adhesive.

The polyester fibers may include general polyester fibers and low melting point polyester fibers.

The general polyester fiber may have a melting point of 260 to 300°C.

The low melting point polyester fiber may have a melting point of 110 to 180°C.

The polyester fiber may be 1 to 20 denier.

The diameter of the polyester hollow fiber may be 20 to 100㎛.

The length of the polyester fiber may be 10 to 150mm.

The length of the polyester hollow fiber may be 20 to 200mm.

The hollowness of the polyester hollow fiber may be 10 to 60%.

The thickness of the compression shoulder may be 5 to 20 mm, and the surface density may be 500 to 1500 g/m ² .

The thickness of the nonwoven fabric may be 1 to 5mm.

The compression cotton may include 10 to 100 parts by weight of the polyester hollow fiber based on 100 parts by weight of the polyester fiber.

The polyester fiber may include 10 to 60 parts by weight of low-melting polyester fiber based on 100 parts by weight of the general polyester fiber.

The romelting fiber nonwoven may be a spun bonded nonwoven or a thermal bonded nonwoven.

The spunbond nonwoven fabric may be made of at least one selected from polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET) as a raw material.

The spunbond nonwoven fabric may have an area density of 50 to 100 g/m 2.

The thermal bond nonwoven fabric may be made of at least one selected from polypropylene (PP), viscos rayon, and polyethylene (PE) as a raw material.

The thermal bond nonwoven fabric may have an area density of 20 to 60 g/m2.

The hot melt adhesive may be made of ethylene vinyl acetate (EVA) or polyamide as a base resin.

The hot melt adhesive may be in the form of one or more selected from a film type, a pellet type, and a powder type.

Preferably, the hot melt adhesive may be a film type.

The sound-absorbing material may be for a dryer or a washing machine.

According to another aspect of the present invention,

(a) preparing a web (web) laminate comprising a polyester fiber and a polyester hollow fiber;

(b) manufacturing a compression face by needle punching the web laminate; And

There is provided a method of manufacturing a sound-absorbing material comprising: (c) thermally bonding a hot melt adhesive between the compression shoulder and the romelting fiber nonwoven fabric.

After step (b), the compression pad may be further dried for 3 to 20 minutes at a temperature of 200 to 240°C.

The drying may be performed using any one selected from a conveyor oven, a through-air system, and an infrared heater.

The thermal bonding of step (c) may be performed at a temperature of 90 to 120°C.

The sound-absorbing material of the present invention is a heat-laminated nonwoven fabric including a compression plush including polyester fiber and polyester hollow fiber and a low melting fiber using a hot melt adhesive, such as a vehicle, a washing machine, Various home appliances that cause vibration and noise, such as dryers, air conditioners, and air purifiers, are especially applied to dryers and washing machines to absorb noise, thereby reducing the noise and vibration of the product to reduce discomfort caused by noise during use. It has the effect of extending product life by minimizing damage to the product.

1 is a cross-sectional view of a sound absorbing material according to an embodiment of the present invention.
2 is a flowchart sequentially showing a method of manufacturing a sound absorbing material according to an embodiment of the present invention.

Since the present invention can apply various transformations and have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted. do.

1 is a cross-sectional view schematically showing the structure of the sound-absorbing material of the present invention. Hereinafter, the sound absorbing material of the present invention will be described with reference to FIG. 1.

The sound-absorbing material of the present invention includes a compression plush (10) comprising a polyester fiber and a polyester hollow fiber; And a nonwoven fabric including a low melting fiber, wherein the compression shoulder surface 10 and the nonwoven fabric are thermally bonded with a hot melt adhesive 20 interposed therebetween.

The polyester fibers may include general polyester fibers and low melting point polyester fibers.

Here, the general polyester fiber refers to a polyester fiber having a melting point of 260 to 300°C, and the low melting point polyester fiber refers to a melting point of 110 to 180°C.

The polyester fiber may be preferably 1 to 20 denier, more preferably 1 to 10 denier, and even more preferably 1 to 5 denier.

The diameter of the polyester hollow fiber may be preferably 20 to 100㎛, more preferably 30 to 80㎛, even more preferably 40 to 60㎛. When the diameter of the polyester hollow fiber is less than 20 μm, the sound-absorbing performance may be deteriorated, and when it exceeds 100 μm, the durability of the compression shoulder surface 10 itself may decrease.

The length of the polyester fiber is preferably a short fiber of 10 to 150mm, more preferably 20 to 100mm, even more preferably 30 to 70mm. When the length of the polyester fiber is less than 10 mm, the sound-absorbing performance may be deteriorated, and when it exceeds 150 nm, the flexibility of the compression shoulder surface 10 may be lowered, making it difficult to apply to a curved surface.

The length of the polyester hollow fiber is preferably a short fiber of 20 to 200mm, more preferably 30 to 150mm, more preferably 50 to 100mm. When the length of the polyester hollow fiber is less than 20mm, the sound-absorbing performance may be deteriorated, and when it exceeds 200mm, the flexibility of the compression shoulder surface 10 may be lowered, making it difficult to apply to a curved surface.

The hollowness of the polyester hollow fiber may be preferably 10 to 60%, more preferably 20 to 60%, even more preferably 40 to 60%. When the porosity is less than 10%, the sound-absorbing performance may be deteriorated, and when it exceeds 60%, the durability of the compression shoulder surface 10 may be deteriorated.

The thickness of the compression cotton 10 is 5 to 20 mm, the areal density is preferably 500 to 1500 g/m ² , more preferably the thickness is 7 to 15 mm, and the areal density is 600 to 1300 g/m ^2, more preferably The thickness may be 8 to 12 mm, and the surface density may be 800 to 1200 g/m ² . If the thickness is less than 5mm, the sound-absorbing performance is deteriorated, and if it exceeds 20mm, the volume is large when applied to a product, and it is difficult to apply it to a curved surface.

The thickness of the nonwoven fabric may be preferably 1 to 5 mm, more preferably 1 to 3 mm, even more preferably 1 to 2 mm. When the thickness of the nonwoven fabric is less than 1 mm, the sound-absorbing performance may be deteriorated, and when the thickness of the nonwoven fabric is more than 5 mm, the thickness of the finished sound-absorbing material becomes too thick, making it difficult to increase the volume when applying the product and apply it to a curved surface.

The compression cotton 10 preferably includes 10 to 100 parts by weight of polyester hollow fiber, more preferably 30 to 90 parts by weight of polyester hollow fiber, and even more Preferably it may contain 50 to 80 parts by weight of the polyester hollow fiber. When the content of the polyester hollow fiber is less than 10 parts by weight, the sound-absorbing performance may be deteriorated, and when it exceeds 100 parts by weight, the durability of the compression shoulder 10 may be deteriorated.

The polyester fiber preferably contains 10 to 60 parts by weight of low-melting polyester fiber, more preferably 20 to 50 parts by weight, even more preferably 30 to 40 parts by weight based on 100 parts by weight of general polyester fiber. Can include. When the low melting point polyester fiber is less than 10 parts by weight, the sound-absorbing performance may be deteriorated, and when it exceeds 60 parts by weight, the heat resistance of the compression shoulder surface 10 may be lowered.

The romelting fiber nonwoven fabric 30 may be a spun bond nonwoven fabric or a thermal bond nonwoven fabric.

The spunbond nonwoven fabric refers to a long fiber nonwoven fabric made of at least one selected from polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET) as a raw material.

The spunbond nonwoven fabric preferably has an area density of 50 to 100 g/m 2, more preferably 50 to 80 g/m 2, and more preferably 50 to 60 g/m 2 Can be If the surface density is less than 50 g/m², the product may be hardened due to insufficient heat adhesion or an excessively high adhesion temperature, and if it exceeds 100g/m2, the sound absorption performance is poor. It can be degraded.

The thermal bond nonwoven fabric refers to a short fiber nonwoven fabric made of at least one selected from polypropylene (PP), viscos rayon, and polyethylene (PE) as a raw material.

The thermal bond nonwoven fabric preferably has an area density of 20 to 60 g/m 2, more preferably 20 to 40 g/m 2, and even more preferably 20 to 30 g/m 2. If the surface density is less than 20 g/m², the process efficiency may be degraded due to insufficient heat adhesion or an excessively high adhesion temperature, and if it exceeds 60g/m2, the sound-absorbing performance may decrease. have.

The romelting fiber nonwoven fabric 30 may use a spunbond having a hard property or a thermal bond having a soft property, if necessary. That is, when applied to the surface of a curved product, it may be more advantageous to use a thermal bond, and when applied to the surface of a product requiring durability, a spunbond may be used.

The hot melt adhesive 20 may be made of ethylene vinyl acetate resin (EVA) or polyamide as a base resin.

The hot melt adhesive 20 may be in the form of at least one selected from a film type, a pellet type, and a powder type, but preferably, a film type may be used.

It is preferable that the sound absorbing material is for home appliances or automobiles.

The home appliance may be a dryer, a dish dryer, an air conditioner, a washing machine, an air purifier, a dehumidifier, and the like, but the scope of the present invention is not limited thereto.

The vehicle may be a passenger car, a bus, a work vehicle, or the like, but the scope of the present invention is not limited thereto, and may include various transportation means that generate noise.

Figure 2 shows the method of manufacturing the sound-absorbing material of the present invention in sequence. Hereinafter, a method of manufacturing the sound absorbing material of the present invention will be described with reference to FIG. 2.

first, polyester Fiber and polyester Hollow fiber The containing web ( web ) Stacked To prepare (step a).

Since the properties and contents of the polyester fiber and the polyester hollow fiber are the same as those described in the description of the sound absorbing material of the present invention, detailed information will be referred to that part.

The polyester fiber and the polyester hollow fiber may be mixed according to the above range to form a web laminate.

Next, the web Stacked By needle punching Compression plush To prepare (step b).

It is preferable to further perform a process of drying the compression cotton at a temperature of 200 to 240° C. for 3 to 20 minutes, and more preferably at a temperature of 210 to 230° C. for 3 to 7 minutes. When drying under conditions that are less than the lower limit of the drying time and temperature or exceed the upper limit, the sound-absorbing performance of the compression bag may be deteriorated or durability may deteriorate.

The drying may be performed by any one selected from a conveyor oven, a through-air system, and an infrared heater.

Finally, remind Compressed cotton Romelting Fiber Between non-woven fabrics Hot melt Through the adhesive Thermally bonded (Step c).

The characteristics of the compression facet, the romelting fiber nonwoven fabric, and the hot melt adhesive are the same as those described for the sound absorbing material of the present invention, and thus details will be referred to that part.

The thermal bonding is preferably performed at a temperature of 90 to 120°C, more preferably 100 to 120°C, and even more preferably 110 to 120°C. If thermal bonding is performed below 90°C, thermal bonding may not be sufficiently achieved. When thermal bonding is performed under conditions exceeding 120°C, the surface of the product becomes hard and the reflectance of sound increases and the sound absorption performance may deteriorate. have.

[ Example ]

Example One

After manufacturing a web laminate using general polyester fiber, low-melting polyester fiber, and polyester hollow fiber, needle punching is performed, and then dried at about 220°C for 5 minutes in an infrared heater to obtain an area density of about 1000 g/m². A phosphorus compression cotton was prepared. An EVA hot melt film was interposed between the prepared compressed cotton and thermal bonded nonwoven fabric, and then heated at 118 to 120°C to heat-bond the compressed cotton and thermal bonded nonwoven fabric to prepare a sound absorbing material.

At this time, general polyester fiber (5 denier, length of about 30 to 70 mm short fiber), low melting point polyester fiber (5 denier, length of about 30 to 70 mm short fiber), and polyester hollow fiber (diameter about 50 µm, length of about 80~100mm, porosity about 50%) was used at a weight ratio of 65:35:60, and the spunbond nonwoven fabric had an area density of 55 g/㎡ Was used.

Example 2

A sound absorbing material was manufactured in the same manner as in Example 1, except that a spunbond nonwoven fabric was used instead of the spunbond nonwoven fabric.

Comparative example One

A sound-absorbing material was manufactured in the same manner as in Example 1, except that ordinary polyester fibers of the same content were substituted for low-melting polyester fibers.

Comparative example 2

A sound-absorbing material was prepared in the same manner as in Example 1, except that low-melting-point polyester fibers of the same content were used instead of regular polyester fibers.

Comparative example 3

A sound-absorbing material was prepared in the same manner as in Example 1, except that ordinary polyester fibers of the same content were substituted for polyester hollow fibers.

Comparative example 4

A sound-absorbing material was manufactured in the same manner as in Example 1, except that the web laminate was passed through a calender roll preheated to 170°C instead of needle punching to prepare a compression pad.

Comparative example 5

A sound-absorbing material was prepared in the same manner as in Example 1, except that when the compression cotton and the spunbond nonwoven fabric were thermally bonded, the EVA hot melt film was not used and directly thermally bonded.

Comparative example 6

A sound-absorbing material was manufactured in the same manner as in Example 1, except that the temperature was adjusted to 121 to 123°C during thermal bonding of the compression cotton and spunbond nonwoven fabric.

Table 1 below summarizes the conditions for producing the sound absorbing material of Examples 1 and 2 and Comparative Examples 1 to 5.

division Polyester fiber Polyester hollow fiber Romelting Fiber Nonwoven Compressed cotton manufacturing method Whether to use hot melt film Thermal bonding temperature
(℃) Example 1 Normal + Low Melting Point use Thermal Bond Needle punching use 118-120 Example 2 Normal + Low Melting Point use Spunbond Needle punching use 118-120 Comparative Example 1 Normal use Thermal Bond Needle punching use 118-120 Comparative Example 2 Low melting point use Thermal Bond Needle punching use 118-120 Comparative Example 3 Normal + Low Melting Point unused Thermal Bond Needle punching use 118-120 Comparative Example 4 Normal + Low Melting Point use Thermal Bond Calender roll use 118-120 Comparative Example 5 Normal + Low Melting Point use Thermal Bond Needle punching unused 118-120 Comparative Example 6 Normal + Low Melting Point use Thermal Bond Needle punching use 121-123

[ Experimental example ]

Measurement of sound absorption coefficient

In order to measure the sound absorption coefficient for each frequency for the sound absorbing materials prepared according to Examples 1 and 2 and Comparative Examples 1 to 5, the results of the measurement by mounting a specimen on an alpha cabin (small reverberation chamber equipment) are shown in Table 2 below. Done.

frequency
(Hz) Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 400 0.280 0.297 0.103 0.109 0.093 0.102 0.080 0.083 500 0.348 0.343 0.242 0.297 0.176 0.217 0.296 0.296 630 0.476 0.430 0.260 0.284 0.258 0.223 0.244 0.274 800 0.754 0.698 0.302 0.323 0.270 0.308 0.356 0.320 1,000 0.789 0.754 0.387 0.428 0.351 0.400 0.408 0.420 1,250 0.635 0.612 0.320 0.382 0.324 0.298 0.302 0.322 1,600 0.345 0.380 0.220 0.204 0.175 0.208 0.276 0.198 Average sound absorption rate 0.518 0.502 0.262 0.290 0.235 0.251 0.280 0.273

According to this, there was little difference in sound absorbing power between the sound absorbing materials of Examples 1 and 2, and showed a significantly higher value in the sound absorbing rate compared to the sound absorbing material manufactured according to Comparative Examples 1 to 6. In other words, even if one of the conditions of the combination of polyester fibers, the use of hollow fibers, the use of a needle punching method in the manufacture of the compression cotton, the use of a hot melt film, and the thermal bonding temperature, which are characteristics of the sound absorbing material of the present invention If omitted, it means that the sound absorption performance as in Examples 1 and 2 of the present application cannot be exhibited.

In the above, embodiments of the present invention have been described, but those of ordinary skill in the art will add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes can be made to the present invention by means of the like, and it will be said that this is also included within the scope of the present invention.

10: compression cotton
20: hot melt adhesive
30: non-woven

Claims (12)

Compression cotton including polyester fiber and polyester hollow fiber; And
Including; non-woven fabric including a low melting fiber (low melting fiber),
Sound absorbing material, characterized in that the compression cotton and the non-woven fabric are thermally bonded through a hot melt adhesive. The method of claim 1,
The polyester fiber is a sound-absorbing material, characterized in that it comprises a general polyester fiber and a low melting point polyester fiber. The method of claim 1,
The polyester fiber is a sound-absorbing material, characterized in that 1 to 20 denier (denier). The method of claim 1,
Sound-absorbing material, characterized in that the diameter of the polyester hollow fiber is 20 to 100㎛. The method of claim 1,
The sound-absorbing material, characterized in that the hollow ratio of the polyester hollow fiber is 10 to 60%. The method of claim 1,
The sound-absorbing material, characterized in that the thickness of the compression cotton is 5 to 20mm, the surface density is 500 to 1500g/m ² . The method of claim 1,
The romelting fiber non-woven fabric is a sound-absorbing material, characterized in that the spun bond (spun bond) non-woven fabric or a thermal bond (thermal bond) non-woven fabric. The method of claim 1,
The hot melt adhesive is a sound absorbing material, characterized in that the base resin is ethylene vinyl acetate (EVA) or polyamide. The method of claim 1,
The sound-absorbing material is a sound-absorbing material, characterized in that used in a dryer or washing machine. (a) preparing a web (web) laminate comprising a polyester fiber and a polyester hollow fiber;
(b) manufacturing a compression face by needle punching the web laminate; And
(c) thermal bonding by interposing a hot melt adhesive between the compression shoulder and the romelting fiber nonwoven fabric. The method of claim 10,
The method of manufacturing a sound absorbing material, characterized in that after step (b), the compression cotton is further dried at a temperature of 200 to 240°C for 3 to 20 minutes. The method of claim 10,
The method of manufacturing a sound-absorbing material, characterized in that the thermal bonding of step (c) is performed at a temperature of 90 to 120°C.

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