KR20170077985A - Sound absorbing-excluding sheet for auto wheel guard and method of manufacturing thereof - Google Patents
Sound absorbing-excluding sheet for auto wheel guard and method of manufacturing thereof Download PDFInfo
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- KR20170077985A KR20170077985A KR1020150188045A KR20150188045A KR20170077985A KR 20170077985 A KR20170077985 A KR 20170077985A KR 1020150188045 A KR1020150188045 A KR 1020150188045A KR 20150188045 A KR20150188045 A KR 20150188045A KR 20170077985 A KR20170077985 A KR 20170077985A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/30—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/08—Front or rear portions
- B62D25/16—Mud-guards or wings; Wheel cover panels
- B62D25/161—Mud-guards made of non-conventional material, e.g. rubber, plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Textile Engineering (AREA)
- Laminated Bodies (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The present invention relates to a suction / sound insulating sheet for an automobile wheel guard, and is produced by applying high-density polyethylene powder to both sides of a nonwoven fabric base material comprising a polyester fiber and a low melting point polyester fiber, The noise reduction performance of the excellent interior of the vehicle is greatly improved, the weight reduction and the thinning become possible, and the molding workability is improved such that the preheating time is shortened as a thin film when the automobile wheel guard is formed by the deep draw method , The appearance of the molding surface can be improved such as no wrinkles.
Description
The present invention relates to a suction / sound insulating sheet for an automobile wheel guard which is thin and light in weight and excellent in suction and sound.
Generally, when a vehicle is driven, air flows around the vehicle body, and the influence of the air generated around the tire can not be neglected.
Due to the air flow generated around the tire, turbulence and vortices are intricately entangled in the vicinity of the tire, which is three-dimensional and complicated. As a countermeasure thereto, a wheel guard that surrounds the tire is installed.
The wheel guard is an external part of a car that is mounted on the car body from the wheel part of the car to prevent damage to the car body caused by the road surface and to block or absorb the noise generated from the road surface and the tire,
The wheel guard has a front and rear wheel guard, and the material of the parts is made of plastic and nonwoven fabric.
Conventionally, a plastic molded and injected with a polypropylene (PP) resin was mainly used.
Once the polypropylene resin is injected, the automobile wheel guard is molded by press method and bonded to each other by vibration welding or high frequency welding. However, the material is inexpensive and has the required rigidity, but it effectively removes the road noise generated during traveling The load noise generated by the friction between the tire and the road may flow into the inside of the vehicle, which may hinder the vibration noise performance of the rear seat. Although the sound absorbing performance is deteriorated in this manner, a separate sound absorbing material such as a thin seal is attached to the rear surface of the wheel guard using a bonding means. However, the manufacturing process is complicated and the improvement of soundproofing is insignificant.
In order to solve such a problem, Korean Patent Publication No. 2011-0029369 discloses a technique in which a backing sound absorbing material made of a sound absorbing skin material such as a wall paper and a felt is laminated on a front surface and a back surface, respectively, Is disclosed.
However, since the wheel guard according to the above technique is formed by laminating various materials, it is not easy to reduce the weight of the wheel guards, and delamination may occur as a laminate. Since the press laminating process is performed by the arrangement method, There is a problem of deterioration.
In order to solve such a problem, a method of manufacturing an automobile wheel guard by laminating a surface of a substrate made of a polyester fiber nonwoven fabric with a synthetic resin film has been proposed.
However, in this method, a separate adhesive is required to laminate the synthetic resin film. In the case of using a thin film, it is not easy to reduce the weight of the sheet and the sheet is difficult to be molded, complicating the manufacturing process. Deep draw causes wrinkles on the molding surface and the formed angle is not sharp, so that it does not show a uniform appearance, and the surface of the nonwoven fabric is blocked, resulting in a problem that sound absorption performance is lowered.
The car wheel guard is still in need of development of new materials due to insufficient noise shielding effect in case of external impact, and there is still a demand for minimizing weight in order to follow the movement of light weight.
Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an absorbent / sound insulating sheet for automobile wheel guards, which uses a nonwoven fabric made of a polyester fiber material as a base material and high density polyethylene powder, And to provide the above objects.
In order to solve the above problems, the present invention provides a car / wheel noise shielding sheet for an automobile wheel guard, which comprises a nonwoven fabric substrate comprising 40 to 80% by weight of a polyester fiber and 20 to 60% Polyethylene powder is applied in a total amount of 80 to 120 g / m < 2 >.
The present invention also provides a fiber mixing step of mixing 40 to 80% by weight of a polyester fiber and 20 to 60% by weight of a low melting point polyester fiber to obtain mixed fibers; An opening step of opening the mixed fibers; Forming a nonwoven fabric by forming the mixed fibers into a web having a predetermined thickness after the opening step, laminating the web, and needle-punching the web laminate to form a nonwoven fabric; A nonwoven fabric base material forming step of forming a nonwoven fabric base material through a heat treatment process for heating and pressing the nonwoven fabric formed in the nonwoven fabric formation process and a cooling process for cooling the nonwoven fabric material; And a powder application step of applying and drying a high-density polyethylene powder on one side of the nonwoven fabric base material in the nonwoven fabric base forming step, and applying high-density polyethylene powder to another side of the dried nonwoven fabric and drying the same, A method of manufacturing an intake / sound-insulating sheet is provided.
According to the present invention, there is an advantage that the noise from the road guard generated by the wheel guard itself, which is made of a new material and structure, is largely absorbed and blocked, thereby greatly improving the noise performance of a good interior of the vehicle.
In addition, due to the application of new materials and structures to the wheel guard, it is possible to achieve weight reduction and thinning, thereby meeting various automobile requirements such as fuel efficiency improvement.
Further, when the automobile wheel guard is formed by the deep draw press method, the molding workability is improved such that the preheating time is shortened as a thin film, and the appearance of the molding surface can be improved such as no wrinkles.
1 is a view showing the structure of a suction and sound insulating sheet for a car wheel guard according to an embodiment of the present invention.
FIG. 2 is a view showing an example of a car wheel guard molded with a suction and sound insulating sheet for a car wheel guard according to an embodiment of the present invention.
3 is a sound absorption test report of a suction / sound insulating sheet for a car wheel guard according to an embodiment of the present invention.
4 is a diagram of an apparatus for measuring sound absorption rate according to MS341-20 4.13.
The present invention relates to a suction and sound insulating sheet for a car wheel guard characterized in that high density polyethylene (HDPE) powder is applied on both sides of a nonwoven fabric base material comprising a polyester fiber and a low melting point polyester fiber .
Wherein the nonwoven fabric substrate comprises 40 to 80% by weight of polyester fibers and 20 to 60% by weight of low melting polyester (LM) fibers, wherein the high density polyethylene powder has a density of 40 to 60 g / M 2 and a total of 80 to 120 g / m 2 are applied to the suction / sound insulating sheet. The suction / sound insulating sheet of the present invention has a thickness of 3 to 10 mm and a weight of 800 to 1,200 g / m 2, 0.35 or more at 2000 Hz, 0.60 or more at 3150 Hz, and 0.70 or more at 5000 Hz.
The low-melting-point polyester fiber is a polyester-modified fiber having a melting point of 110 to 200 캜, which is lower than that of polyethylene terephthalate (PET) fiber, which is a general polyester fiber, having a melting point of 255 캜. LM, LOMELA of Huvis, EZBON-L, EZBON, EZBON-H of TORAY CHEMICAL are commercial products of the low melting point polyester fiber.
When the low-melting-point polyester fiber is less than 20% by weight in molding the automotive wheel guard by the deep draw press method, the preheating temperature may become high or the preheating time may become long and the molded surface may become uneven, If it is more than 60% by weight, wrinkles may be generated on the molded surface and the appearance quality is deteriorated, which is not preferable.
If the application amount of the high-density polyethylene powder of the nonwoven fabric substrate is less than 80 g / m 2, the preheating temperature is increased or the preheating time is prolonged to lower the productivity and the improvement of the sound absorption property is insignificant. When the amount is more than 120 g / m 2, And the flatness is lowered to cause wrinkles, which is undesirable.
If the application amount is less than 40 g / m < 2 > on one side, the strength of the outer surface of the suction and sound insulating sheet is lowered and the improvement in sound absorption performance is insignificant. If it exceeds 60 g / m < 2 >, the outer surface becomes uneven, Can be prolonged.
If the thickness of the intake / sound-absorbing sheet of the present invention is less than 3 mm, the form stability is lowered and it is difficult to form the automotive wheel guard by the deep draw press method. If it exceeds 10 mm, the intake / And the formed surface may become uneven, which is not preferable.
When the weight of the suction / sound insulating sheet of the present invention is less than 800 g / m 2, it is difficult to form the car wheel guard in a deep draw manner. When the weight of the car seat guard is more than 1,200 g / m 2, Impregnation with the polymer can be excessively undesirably deteriorated.
A method for producing a sound absorbing and sound insulating sheet for an automobile wheel guard according to the present invention comprises: a fiber mixing step of mixing 40 to 80% by weight of a polyester fiber and 20 to 60% by weight of a low melting point polyester fiber to obtain mixed fibers; An opening step of opening the mixed fibers; Forming a nonwoven fabric by forming the mixed fibers into a web having a predetermined thickness after the opening step, laminating the web, and needle-punching the web laminate to form a nonwoven fabric; A nonwoven fabric base material forming step of forming a nonwoven fabric base material through a heat treatment process for heating and pressing the nonwoven fabric formed in the nonwoven fabric formation process and a cooling process for cooling the nonwoven fabric material; And a powder application step of applying and drying a high-density polyethylene powder on one side of the nonwoven fabric substrate in the nonwoven fabric substrate forming step, and applying high-density polyethylene powder to another side of the dried nonwoven fabric substrate and drying the same.
Wherein the step of mixing the polyester fiber with the low melting point polyester fiber comprises 40 to 80% by weight of the polyester fiber and 20 to 60% by weight of the low melting point polyester fiber, wherein the single yarn length of the polyester fiber is a low melting point polyester It is more preferable that the range of 1.2 to 1.5 times the length of the single yarn of the fiber improves the moldability of the automobile wheel guard such as the preheating time and the like.
The cotton-like polyester fibers and the low-melting-point polyester fibers intertwined with each other are loosened by the open face, whereby the density can be uniformized and the physical properties can be stabilized in the suction / sound insulating sheet.
The web laminate can adjust the thickness and rigidity of the final product according to the number of laminated sheets by laminating the opened sheets, and it is more preferable to laminate webs in 2 to 7 layers.
In the nonwoven fabric forming step, the web laminate is made to have a constant width and thickness, and the web laminate pressed by needle punching is bound to form a nonwoven fabric.
The needle punching may be a downward punching operation, a first needle punching operation from the top downward, and a second needle punching operation from the bottom downward by up punching.
In the heat treatment step in the nonwoven substrate forming step, the nonwoven fabric is heated and pressed while passing through a roller heated to a temperature between the melting point of the polyester fiber and the low melting point polyester fiber, so that the low melting point polyester fiber is melted, It is possible to improve the shape stability and firmness of the nonwoven fabric and to prevent the nonwoven fabric from being deformed when the high-density polyethylene powder is applied, and to improve the morphological stability in molding the car wheel guard.
Subsequently, the deformation of the nonwoven fabric in which the binding is strengthened can be suppressed through the cooling step and the rigidity can be enhanced.
The powder coating step is a step of applying high-density polyethylene powder to both surfaces of the nonwoven fabric after the step of forming the nonwoven base material, wherein the amount of the high-density polyethylene powder is 40 to 60 g / m 2 on one side, To a total of 80 to 120 g / m 2.
If the amount of the nonwoven fabric to be coated on one side is less than 40 g / m 2 or more than 60 g / m 2, there is a problem in that the physical properties such as dimensional stability, tensile strength, , There is a problem that the process of treating the high-density polyethylene powder is prolonged.
The high-density polyethylene powder preferably has an average particle diameter of 30 to 80 mesh. When the average particle size is less than 30 mesh, the melting process is not sufficient and the application time may become longer and the applied surface may become uneven. If the average particle size exceeds 80 mesh, the high-density polyethylene powder is melted too quickly when dried, The impregnation depth and adhesion of the web laminate and the high-density polyethylene powder layer are affected.
On the other hand, when applying the powder, 10 to 40 parts by weight of a polyethylene-based adhesive resin powder may be further added to 100 parts by weight of the high-density polyethylene powder.
The adhesive resin powder comprises 10 to 30% by weight of a graft polymer prepared by grafting a high-density polyethylene resin with maleic anhydride, and 70 to 90% by weight of polyethylene. The adhesive resin powder has a melting point of 80 to 180 ° C, Is in the range of 2 to 40 g / 10 min (190 ° C under 2.16 Kg), and the average particle size is 30 to 100 mesh.
Commercially available products of the adhesive resin powder include LE851P, MP300JA of Hyundai EI, and EM400 of Lotte Chemical Co., Ltd.
When the high-density polyethylene powder is applied to the nonwoven fabric base material, the adhesive resin powder is added to improve the bonding strength with the nonwoven fabric base material. As a result, the moving speed of the nonwoven fabric base material can be increased during continuous application, The powder is prevented from being impregnated deeply into the surface layer of the nonwoven fabric substrate to improve the strength of the outer surface while preventing the sound absorption from being deteriorated and the high density polyethylene layer formed during the deep draw press forming of the automotive wheel guard And separation can be prevented. In addition, the adhesive resin powder suppresses the penetration of the high-density polyethylene powder into the nonwoven fabric base material, thereby increasing the density in the surface direction of the nonwoven fabric base material, thereby improving the rigidity and improving the sound absorbing performance by the nonwoven fabric base material.
The high density polyethylene powder is applied to the nonwoven fabric as described above and then dried. The drying is performed in an oven at 150 to 250 DEG C, and the high density polyethylene powder is melted by drying to impregnate a part of the nonwoven fabric. Thereby forming a high-density polyethylene layer on the nonwoven fabric.
After the drying, it is possible to carry out post-cooling by cooling while pressurizing.
After the post-cooling, the nonwoven fabric having the high-density polyethylene layer formed on its surface through the drying oven is passed through the cooling rollers to increase rigidity and smooth the surface.
Thereafter, the high-density polyethylene layer is formed on both sides of the non-woven fabric by applying the high-density polyethylene powder through a powder applicator while the opposite surface to which the powder is not applied is directed upward, And the total weight is 800 to 1,200 g / m < 2 > so as to manufacture a suction / sound insulating sheet for an automobile wheel guard.
The suction and sound insulating sheet for an automobile wheel guard according to the present invention thus manufactured can further improve the heat insulating property and the sound absorbing property which are the advantages of the conventional nonwoven fabric and the dimensional change in the transverse and longitudinal directions does not occur and the tensile strength remarkably rises , Particularly, the stiffness is improved on the outer surface, and the deep-draw press forming workability of the wheel guard is improved by the thin film.
In addition, high-density polyethylene powder is applied to both sides of the nonwoven fabric to form a layer, which improves the flatness of the intake and sound insulating sheet, thereby improving workability of the automotive wheel guard forming.
Hereinafter, the present invention will be described in detail with reference to Examples. It is to be understood, however, that these examples are for illustrative purposes only and are not to be construed as limiting the scope of the invention as defined by the appended claims. And will be apparent to those skilled in the art to which the present invention pertains.
[Example 1]
60 weight% of a polyester fiber having a melting point of 255 deg. C (TORAY CHEMICAL, fineness: 6d, single yarn length: 64 mm) and 40 weight% of low melting point polyester fiber having a melting point of 110 DEG C (TORAY CHEMICALS, % By weight, and a web having a weight of 500 g / m < 2 > which is obtained by carding is laminated in two layers and primary and secondary punching are carried out to bind the fibers to form a nonwoven fabric, The formed nonwoven fabric was passed through a 180 ° C heat-pressure roller and a cooling roller in succession to form a nonwoven base substrate.
A high density polyethylene (HDPE) powder having an average particle size of 40 mesh was applied on one side of the formed nonwoven substrate in an amount of 50 g / m 2, dried at 180 캜 in a drying furnace having a length of 5 m while moving using a conveyor belt, And dried at 180 캜 in a drying furnace having a length of 5 m while being moved using a conveyor belt to prepare an absorbing and sound insulating sheet having a thickness of 8 mm and a weight of 1,000 g / m 2.
[Example 2]
Sound absorbing sheet was manufactured using the same method as in Example 1, except that 40 wt% of the polyester fiber and 60 wt% of the low melting point polyester fiber were mixed in Example 1.
[Example 3]
Sound-absorbing sheet was produced in the same manner as in Example 1, except that the high-density polyethylene (HDPE) powder was coated on one side of 40 g / m < 2 > .
[Example 4]
The adhesive resin powder (EM400, manufactured by Lotte Chemical Co., Ltd., Korea) having an average particle size of 50 mesh was coated with 40 g / m 2 of the high density polyethylene (HDPE) powder on one side and 40 g / ) Was further coated on each side by 10 g / m < 2 >, respectively.
[Comparative Example 1]
A sound absorbing / sound insulating sheet was produced in the same manner as in Example 1, except that the high density polyethylene (HDPE) powder was not applied.
[Comparative Example 2]
A sound absorbing / sound insulating sheet was prepared in the same manner as in Example 1, except that a high density polyethylene (HDPE) film having a thickness of 50 占 퐉 was laminated instead of the high density polyethylene (HDPE) .
[Comparative Example 3]
A sound absorbing / sound insulating sheet was prepared in the same manner as in Example 1, except that the high density polyethylene (HDPE) powder was applied on each surface of the sheet in an amount of 30 g / m 2.
[Comparative Example 4]
A sound absorbing / sound insulating sheet was prepared in the same manner as in Example 1, except that the high density polyethylene (HDPE) powder was applied on each surface by 70 g / m < 2 >
The characteristics of the sound absorbing and heat insulating sheets prepared in the above Examples and Comparative Examples were evaluated using the following evaluation methods, and the results are shown in Tables 1 and 2.
<Evaluation method>
1. Absorption rate
The acoustic energy incident on a wall or an object is divided into a reflected portion, a transmitted portion, and an absorbed portion. The ratio of the sum of the absorption energy and the transmission energy to the incident energy is referred to as a sound absorption rate.
In the present invention, the sound absorption coefficient is measured by the method of MS341-20 4.14.
MS341-20 Section 4.14 is a measurement method of vertical absorption absorption rate using the apparatus shown in FIG. 4 by charging a sample to one end of a tube and generating a pure tone with a speaker attached to the other end.
2. Moldability of wheel guard for automobile
Hyundai LF (Sonata) car Rear wheel guard Press mold for the rear wheel guard is equipped with a suction and sound insulation sheet, heated and pressurized to mold, and the molding work such as preheating temperature, preheating time, press pressure and appearance of molded wheel guard are visually Observe.
It can be seen from the above Table 1 that the sound-absorbing / sound insulating sheet according to the present invention is improved in sound absorption ratio as compared with the case where the high-density polyethylene powder is not applied (Comparative Example 1) and the case where the film is laminated instead of the powder (Comparative Example 2) .
From the above Table 2, it can be seen that the suction and sound insulating sheet according to the present invention has improved productivity of the suction / sound insulating sheet and moldability of the automotive wheel guard, compared with those in which the high-density polyethylene powder is under- or over- applied (Comparative Examples 3 and 4) .
This research is the result of research carried out by the 'Ministry of Industry and Commerce', 'Korea Industrial Technology Development Agency' and 'Daegu Regional Business Evaluation Team', 'Economic Cooperation Volunteering Project' (This research was financially supported by Ministry of Trade, Industry & Energy (MOTIE), Korea Institute for Advancement of Technology (KIAT) and DaeGu Institute for Regional Program Evaluation (DGIRPE) through the Industries of Economic Cooperation Region.
Claims (5)
Wherein the high density polyethylene powder is applied in a total amount of 80 to 120 g / m < 2 > on both sides of a nonwoven fabric base comprising 40 to 80% by weight of polyester fibers and 20 to 60% · Sound insulation sheet.
Wherein the sound absorbing / sound insulating sheet has a sound absorption rate (based on MS341-20 4.14) of 0.16 or more at 1000 Hz, 0.35 or more at 2000 Hz, 0.60 or more at 3150 Hz, or 0.70 or more at 5000 Hz.
An opening step of opening the mixed fibers;
A nonwoven fabric forming step of forming the mixed fibers into a web having a predetermined thickness, laminating the webs, and needle punching the web laminate to form a nonwoven fabric;
A nonwoven fabric base material forming step of forming a nonwoven fabric base material through a heat treatment process for heating and pressing the nonwoven fabric formed in the nonwoven fabric formation process and a cooling process for cooling the nonwoven fabric material; And
A powder application step of applying and drying a high-density polyethylene powder on one side of the nonwoven fabric substrate in the nonwoven fabric substrate forming step, and applying a high-density polyethylene powder to another side of the dried nonwoven fabric and drying the same; Method of manufacturing a sound - insulating sheet.
The high-density polyethylene powder has an average particle diameter of 30 to 80 mesh and is coated with 40 to 60 g / m 2 on one side of the nonwoven fabric substrate so that the total of 80 to 120 g / m 2 is applied and impregnated on the sheet Wherein the method comprises the steps of:
Wherein 10 to 40 parts by weight of an adhesive resin powder containing a graftomer prepared by grafting a high-density polyethylene resin with maleic anhydride to 100 parts by weight of the high-density polyethylene powder is further added in the step of applying the powder. (EN) METHOD FOR MANUFACTURING INSULATION /
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2015
- 2015-12-29 KR KR1020150188045A patent/KR20170077985A/en not_active Application Discontinuation
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