KR19990033419A - Sound insulation made of polyethylene terephthalate fiber - Google Patents

Abstract

The present invention relates to a soundproofing material made of polyethylene terephthalate fibers having uniform quality distribution of sound absorbing and insulating properties, excellent molding processability, moldability, and excellent recycling properties of the material itself.

The sound insulation material of the polyethylene terephthalate fiber of this invention is formed by thermoforming together the normal polyethylene terephthalate fiber and the low melting point polyethylene terephthalate fiber.

Description

Sound insulation made of polyethylene terephthalate fiber

The present invention relates to a soundproofing material made of polyethylene terephthalate (PET) fibers, and more particularly, to a polyethylene terephthalate fiber having excellent quality distribution of sound absorbing and insulating properties, excellent molding processability, moldability and excellent recycling properties of the material itself. It is about soundproofing material.

Felts, which are currently widely used as industrial materials, are used as a sound absorbing material or a substrate for automobile DR trim (TRIM), and in particular, are bound with phenol resin, needle, etc. for binding between fibers. Since the main material of felts is highly dependent on scraps of fibers, the supply of materials is not smooth according to the supply and demand of fibers, and it is difficult to maintain the shape as time goes by, and the initial sound absorption characteristics are continuously maintained. It is not easy to maintain the stability of the quality due to the large dispersion of the sound absorption performance of the product, there is a disadvantage that the workability is not good because dust is generated during the work.

In order to solve the above problems, the present inventors have completed the present invention as a result of studying a soundproof material made of polyethylene terephthalate fiber, which is currently known as a nonwoven material.

The present invention has uniform quality distribution of sound absorbing and insulating characteristics, excellent molding processability during product molding, excellent moldability to maintain shape after molding, smooth supply of materials, and environmentally friendly since there is no dust generation during operation. It is an object of the present invention to provide a soundproofing material made of polyethylene terephthalate fiber having excellent recycling property of a material.

1 is a graph showing the loss coefficient of the sound insulation of the Examples and Comparative Examples of the present invention

In order to achieve the above object, the soundproofing material of the polyethylene terephthalate fiber of the present invention is formed by thermoforming the normal polyethylene terephthalate fiber and low melting point polyethylene terephthalate fiber together.

The polyethylene terephthalate fiber used for the soundproofing material of this invention is a mixed fiber of normal polyethylene terephthalate fiber and low melting point polyethylene terephthalate fiber. Here, a normal polyethylene terephthalate fiber says that melting | fusing point (Tm) is 250-260 degreeC, and low melting-point polyethylene terephthalate fiber says that melting | fusing point (Tm) is 140-160 degreeC.

The soundproofing material of the present invention is formed by thermoforming a common polyethylene terephthalate fiber and a low melting polyethylene terephthalate fiber together. As the binder acts as a binder, the quality distribution of the sound absorbing and insulating properties is uniform, and the molding processability is excellent when forming the product. Unlike the properties to restore to the original state (flat shape), the formability to maintain the shape is good, so that the shape of the product after molding is maintained over time. In addition, the sound insulation material of the present invention is not a problem in the supply and demand of materials, there is no dust generated during the operation is also advantageous in terms of environmental protection and excellent recycling properties of the material itself.

The polyethylene terephthalate fibers used in the present invention preferably use different diameters, in particular, fibers of 3 and 10 deniers, rather than those of the same fiber diameter, wherein 50 weight of the 3 denia polyethylene terephthalate fibers is used. It is preferable that% or more is a low melting polyethylene terephthalate fiber.

It is also desirable to bind the fibers with a needle punch.

Hereinafter, the present invention will be described by way of examples. However, the following examples do not limit the scope of the present invention.

<Example>

Polyethylene terephthalate fiber 3dena and 10denia are mixed and impregnated with a needle punch to bundle a web of fiber in a web state made through carding and lapping processes. ) And time (25-35 seconds) under pressure and molding to form a soundproofing material. Here, 50 weight% of 3 deniers used the release cross-section yarn of (triangle | delta) form.

Comparative Example 1

Polyethylene terephthalate fiber 6dena and 12denia are mixed and impregnated with a bundle of web fibers made of phenol resin by carding and lapping process. 25 to 35 seconds) under pressure and molded to form a soundproof material.

Comparative Example 2

Polyethylene terephthalate fiber 15 denier and 20 denia are mixed and impregnated with a bundle of web-like fibers made by carding and lapping process with phenol resin to obtain an appropriate temperature (230-250 ° C.) and time ( 25 to 35 seconds) under pressure and molded to form a soundproof material.

Comparative Example 3

Polyethylene terephthalate fiber 10dena and 15denia are mixed and impregnated with a needle punch to bundle web-like fiber bundles made by carding and lapping processes. ) And time (25-35 seconds) under pressure and molding to form a soundproofing material. Here, 50 weight% of 10 denier used the release cross-section yarn of (triangle | delta) form.

The structural features of the fibers of the Examples and Comparative Examples are summarized in Table 1 below.

Composition of felt and PET fibers division Comparative Example 1 Comparative Example 2 Comparative Example 3 Example Thickness (mm) 20 20 20 20 Weight (kg / m ² ) 1.00 1.00 1.00 1.00 Textile denia 6 + 12 15 + 20 10 + 15 3 + 10 Binding method Phenolic Resin Phenolic Resin Needle Punch Needle Punch

In order to evaluate the sound insulation performance of the soundproofing materials of the above Examples and Comparative Examples, it was tested by the in vitro method according to ASTM E1050. And the results are shown in Figure 1 and Table 2.

Sound Absorption Rate of PET Fiber Frequency (Hz) Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 100 0.007 0.007 0.008 0.009 125 0.008 0.009 0.01 0.018 160 0.017 0.016 0.02 0.025 200 0.02 0.017 0.021 0.028 250 0.026 0.023 0.03 0.034 315 0.032 0.03 0.035 0.04 400 0.058 0.05 0.06 0.064 500 0.08 0.075 0.082 0.089 630 0.125 0.105 0.142 0.189 800 0.165 0.144 0.155 0.204 1000 0.226 0.214 0.234 0.286 1250 0.324 0.301 0.321 0.387 1600 0.428 0.396 0.43 0.498 2000 0.503 0.465 0.521 0.562 2500 0.612 0.596 0.596 0.661 3150 0.723 0.741 0.756 0.801 4000 0.814 0.867 0.863 0.879 5000 0.924 0.953 0.932 0.964 6300 0.934 0.968 0.954 0.97

As shown in FIG. 1 and Table 2, it has a sound absorption effect of about 10% over the entire frequency region, and it can be seen that the sound absorbing and insulating performance of the embodiment is the best.

As described above, the present invention relates to a soundproofing material formed by thermoforming a common polyethylene terephthalate fiber and a low melting point polyethylene terephthalate fiber together, and the soundproofing material of the present invention has a uniform quality distribution of sound absorbing and insulating properties, and when forming a product. Excellent molding processability, excellent moldability to maintain shape after molding, smooth supply and demand of materials, no dust generation during operation, environmentally friendly, and excellent recycling of materials.

Claims (4)

Soundproofing material made of polyethylene terephthalate fiber formed by thermoforming ordinary polyethylene terephthalate fiber (Tm: 250-260 ° C) and low melting point polyethylene terephthalate fiber (Tm: 140-160 ° C) together The soundproofing material of polyethylene terephthalate fiber of Claim 1 whose diameters of a polyethylene terephthalate fiber are 3 denia and 10 denia. The soundproof material of polyethylene terephthalate fiber according to claim 2, wherein at least 50% by weight of the 3 denia fiber is a low melting polyethylene terephthalate fiber. The sound insulating material of polyethylene terephthalate fiber of Claim 1 characterized by the above-mentioned fiber binding to a needle punch.