KR20060063846A - Absorbing panel for preventing noise of road and a process for preparing thereof - Google Patents

Abstract

The honeycomb core dipping into the ethylene vinyl acetate resin (EVA) adhesive liquid is spaced 1.5 spaces apart from the upper and lower ends of the core 1 in which the height of the honeycomb core 1 is divided into six equal parts. 5) (5 '), and at the remaining third third position remaining inside, the space (4) is formed at the center by a thickness equal to one, while the upper and lower foams at the position of each equal portion above and below the space The honeycomb core 1 in which the foamed phenolic resin board including the phenolic resin plates 2 and 3 is inserted is perforated at the bottom of the honeycomb core 1 at regular intervals, and the inside of the suction hole 6 is The water-repellent glass cloth layer 12 is laminated on the outer surface and interpolated into a lower case 8 made of a quadrangular tube with a melamine resin sponge 7 thereon, and then the honeycomb 1 and the lower part Between the top of the case 8 and the upper and lower cases 8 and 9 of the side circumference After the formation of the melt adhesive layer 10, a rectangular coupled to the upper case (9) and whole by road traffic noise limiter is configured as a high-performance heupeumpan be bonded and fixed with the President and noncombustible performance.

Description

High-performance sound absorbing plate and its manufacturing method {Absorbing panel for preventing noise of road and a process for preparing knowledge}

1 is a cross-sectional view of the process of first inserting the foamed phenolic resin plate into the honeycomb spring-loaded honeycomb according to the present invention.

Figure 2 is a cross-sectional view of the process of inserting the foamed phenolic resin plate into the honeycomb according to the present invention with a spring-loaded second rod.

3 is a cross-sectional view of a state in which the foamed phenolic resin plate is pre-inserted by a compression press on the upper and lower honeycomb according to the present invention.

FIG. 4 is a cross-sectional view of the foamed phenol resin plate preliminarily inserted in FIG. 3 being pushed to a required height with an air compression mill. FIG.

Figure 5 is a cross-sectional view of the completed insertion of the foamed phenolic resin plate in the honeycomb core according to the present invention.

Figure 6 is a cross-sectional view of the process of interpolating the honeycomb core inserted foamed phenolic resin plate according to the present invention in the upper and lower cases.

7 is a cross-sectional view of the sound absorbing plate completed according to the present invention.

* Description of the symbols for the main parts of the drawings *

a; Honeycomb core height a '; Mop height

b; 3.5 equal height c; 1.5 equal height

d; First position e; 1.5 equal height

One ; Honeycomb cores 2,3; 1,2 foamed phenolic resin board

4 ; Central space 5,5 '; Top and bottom outer space

6; Suction hole 7; Melamine resin sponge

8 ; Lower case 9; Upper case

10; Adhesive layer 11; Adhesive tape

12; Glass cloth layer 13, 13 '; Crimp press

14; Forming mold 15; spring

16,16 '; Crowding 17; Wheat plate

18; Injection hole 19; Air compressor

The present invention relates to a sound absorbing plate for an elevated road surface, a sound absorbing wall, or a tunnel interior. Particularly, the upper part of the upper and lower casings is formed by inserting a foamed phenolic resin plate in multiple layers to maintain a predetermined space in a honeycomb core. The present invention relates to a high-performance sound absorbing plate for preventing road traffic noise and a method of manufacturing the sound absorbing plate.

Sound absorbing plates for noise prevention on road traffic, which are used for sound absorbing walls on the back of tunnels, inside tunnels, or on highways, are known to have glass fibers between 5 and 10 cm between two steel plates that are holed on both sides or one side. Inserted or filled with foamed phenolic resin or urethane resin (100%), but the glass fiber is interposed between the hole-plated iron plate because of the heavy load due to the iron plate and glass fiber, handling, transport and There was a difficulty in construction, especially when the moisture is filled, the glass fiber, which is the core material, gets wet and the sound absorption performance is deteriorated. Also, since it is not a honeycomb core structure, the steel plate is thick, which makes the load heavy, which makes it difficult to handle, transport, and install the glass. When working with fibers such as interpolation and cutting, there was a difficulty in working due to the scattering problem of glass powder. The filling of the nium honeycomb core with foamed phenol resin or urethane resin consumes a lot of foamed phenol resin or urethane resin, which not only contributes to the cost increase but also the sound absorption rate is difficult to exceed 0.7 or more. It is known that the sound absorption coefficient (NRC) is 0.6 or less for the sound absorbing wall of the highway and 0.7 or less for the ceiling or the wall of the tunnel, so that a perfect sound absorbing effect can be obtained in the highway, overpass or tunnel. Since the sound absorption coefficient was not reached to 0.9, a perfect sound absorption effect was not obtained.

The present invention improves the defects of the conventional road traffic sound absorbing plate as described above, so that the average incidence of sound absorption of the road traffic noise (⅓ 브 noise reduction coefficient measured in octave frequency band: NRC (noise reduction coefficient) reached 0.9) Foamed phenolic resin consisting of a double layer (double layer) of foamed phenolic resin plates of a certain thickness so as to form a constant space in the upper and lower and middle portions of a light aluminum honeycomb core in order to almost absorb the traffic noise. The honeycomb core with plate is inserted into the lower case of the lower case, and the suction hole is inserted into the lower case to manufacture a sound absorbing plate. Between the melamine sponge layer embedded in the cloth layer and the honeycomb core and the foamed phenol resin board itself The present invention provides a high-performance sound absorbing plate for preventing road noise and absorbing and dissipating and dispersing the road traffic noise by a space formed therein, and a method of manufacturing the plate, which will be described in detail with reference to the accompanying drawings. Same as

Divide the honeycomb cores which were dipping into the ethylene vinyl acetate resin (EVA) adhesive liquid at six equal heights of the honeycomb cores (1) into 1.5 equal parts from the upper and lower ends of the honeycomb cores (1). The space is to be formed by spaces 5 and 5 ', while the remaining third half of the space is spaced into the space 1 by 1 equal thickness in the center. As for the honeycomb core 1 in which the foamed phenolic resin board which consists of as many upper and lower foamed phenolic resin boards 2 and 3 was inserted, the suction hole 6 was drilled at a predetermined interval in the bottom, and the suction hole ( 6) The inner surface of the glass cloth layer 12 is treated with a water-repellent treatment on the outer surface, the inner surface of the melamine resin sponge (7) is embedded in a lower case (8) made of a square cylinder with a predetermined thickness, and then Top and side circumferences of the honeycomb 1 and the lower case 8 Any one selected from among ethylene vinyl acetate copolymer resin, polyethylene resin adhesive, ethyl ethylene acrylate copolymer copolymer, polyvinyl acetate adhesive, and polyvinyl butyral resin adhesive, which is a hot melt adhesive for metal between the lower cases (8) and (9) After the adhesive layer 10 is formed, the upper and lower casings of the quadrangular cylinders are combined to heat, melt and cure while compressing the upper and lower cases 8 and 9 so as to be in close contact with each other. 8) (9) is a high-performance sound absorbing plate for preventing road traffic noise, which is made of adhesive fixing.

The reason for the instant dipping of the honeycomb core in the EVA adhesive liquid is that the sound absorbing plate of the present invention is embedded in the honeycomb core at regular intervals due to the continuous vibration of the road when the sound absorbing plate of the present invention is used for the sound absorbing plate on the back side of the road or the soundproofing and sound absorbing wall of the highway. Since one foamed phenolic resin board (2) (3) moves little by little and can not maintain a gap between each other, but sticks together or agglomerates, it may interfere with the sound absorption effect. It is for fixing and fixing (3).

Sound absorbing plate for preventing road traffic noise of the present invention configured as described above is manufactured by the following process.

As shown in FIG. 1, the height a 'and the honeycomb core height a of the straw plate 17 for pushing the foamed phenolic resin plate to a predetermined height by the spring 15 by the spring 15 The inside of the mold 14 having depth and width is divided into six equal parts of the honeycomb height except for the height of the pusher board, and the height of 3.5 equal parts of the honeycomb core within the mold 14. The honeycomb core (1) is installed on the straw plate (17) of the straw plate (17) which is expanded by the spring (15) to push the expanded phenolic resin plate. ) Honeycomb core with a first foamed phenolic resin board (2) having a thickness equal to 1/6 (1 equal) of depth (height) placed on it, and instant dipping into ethylene vinyl acetate (EVA) resin adhesive. Raise the honeycomb core 1 by leveling the honeycomb core 1 with a uniform height by pressing 13 at the top of the honeycomb core 1 (1) the first foamed phenolic resin plate (2) of the honeycomb core (1) by pressing until the bottom end penetrates the gap between the rod (17) to reach the bottom (18) of the rod (17) A space (5) is formed in a 1.5 equal (1.5 / 6 equal) position (c) at the top, and is inserted at a first (1/6 equal) position (d) below and adhered and fixed by a dipped EVA adhesive. Then, in the state in which the honeycomb core 1 into which the pressing press 13 and the first foamed phenolic resin plate 2 are inserted and fixed is taken out, as shown in FIG. A pusher plate 17 is installed at the lower end of the comb core 1 to be expanded by the spring 15 to 1.5 equal (1.5 / 6 equal) height (e) of the honeycomb core to push up the foamed phenolic resin board. Another second foamed phenol resin plate 3 having a thickness corresponding to one-half (1/6) of the honeycomb core 1 depth (height) was placed on the rod 16 of the rod 17. Put it horizontally, On the second foamed phenolic resin board 3, a honeycomb core 1 into which the first foamed phenolic resin board 2 is first inserted by a process is placed on the second foamed phenolic resin board 3, and then, in the same manner as in FIG. The honeycomb core 1 is compressed by the 13 so that the lower end of the honeycomb core 1 penetrates through the second foamed phenol resin plate 3 and penetrates the gap between the pusher plates 17 so that the pusher plate ( 17) and then press compression 13 to remove the first and second foamed phenolic resin plates 2 and 3 so that the center of the honeycomb core 1 is 1 (1/6). A honeycomb core 1 formed by inserting the space 4 into equal parts and inserted into the space 5 and 5 'by 1.5 (6/6) equal parts on the upper and lower sides thereof, respectively. Separated from (14), a honeycomb core 1 having a first and second foamed phenolic resin plates 2 and 3 embedded therein as shown in FIG. 5 is obtained, or as shown in FIG. First, the top and bottom crimping on the top and bottom of the honeycomb core (1) The first and second foamed phenolic resin plates 2 and 3 are pushed into the res 13 and 13 ′, and then, as shown in FIG. While pressing the honeycomb core 1 with the crimping press 13 at the upper portion, the upper and lower portions are moved up and down to a predetermined height by the push rod 16 'which is lifted by the air pressure injected into the injection hole 18 by the air compressor 19. The foamed phenolic resin plates (2) (3) are pushed one by one, and then separated from the molding die (14), and the first and second foamed phenolic resin plates (2) (3) as shown in FIG. After the honeycomb core 1 was obtained, the honeycomb core 1 having the first and second foamed phenolic resin plates 2 and 3 obtained therein was built, as shown in FIG. The suction hole 6 is drilled at regular intervals, and the bottom case 8 is formed of a quadrangular tube with a glass cloth layer 12 having a water repellent treatment on the outer surface thereof and a non-combustible melamine resin sponge 7 laid in sequence. After being embedded in the upper and upper sides of the honeycomb core 1 and the lower case 8, the side circumference of the lower case 8, 9 is in contact with the ethylene vinyl acetate copolymer resin adhesive, polyethylene resin After laminating an adhesive layer 10 selected from an adhesive, an ethylene ethyl acrylate copolymer resin adhesive, a polyvinyl acetate adhesive, a polyvinyl butyral resin adhesive, or an epoxy resin adhesive or a polyurethane resin adhesive that can be adhered at room temperature, 4 Cover the upper case (9) made of a square tube and press with a compression press (13) to press the water-repellent glass cloth layer (12) and melamine sponge (7) on the bottom of the lower case. In the state of being in close contact, the upper and lower boundary parts of the case 8 and 9 are attached by fixing the adhesive tape 11, or additionally fixed by rivets for structural reinforcement. Next, when the combined upper and lower cases (8) and (9) have a hot melt adhesive as the adhesive layer (10), they are heated in a heating furnace (not shown) at a temperature of about 70 to 160 ° C. for about 8 minutes. When the hot melt adhesive is melted, the upper and lower cases 8 and 9 are adhered to each other, or when the adhesive layer 10 is adhesively cured at room temperature, the upper and lower cases 8 and 9 are cured in the air. After fixing, the adhesive tape 11 is removed, thereby completing a high-performance sound absorbing plate for preventing road traffic noise as shown in FIG.

Instant dipping of the honeycomb core (1) in the EVA resin adhesive in the first step in the above process is that the EVA resin is adhered to the entire honeycomb core (1), the first and second foamed phenolic resin plates (2) (3) It is intended to be adhesively fixed as soon as it is fitted, by installing a straw plate 17 in the mold 14, the first or second foamed phenol resin plate (2) in the honeycomb core (1) by the straw plate 17 (3) is built in the spring (15) of the pusher plate 17 to push up the pusher 16, the foamed phenolic resin board (2) (3) is inserted only to a predetermined height fixed to the dipped adhesive In the above, the adhesive layer 10 is melted by heat when heated to a temperature of about 70 ~ 160 ℃ in the case of hot-melt metal adhesive to bond the upper and lower cases (8) (9) or at room temperature For adhesive-cured adhesives, they are adhered and cured at room temperature to obtain adhesion and waterproof effect. Attaching the adhesive tape 11 while pressing the honeycomb core 1 with the high pressing press 13 is that the lower end of the honeycomb core 1 is laid on the bottom surface of the lower case 8. The non-combustible melamine resin sponge (7) is fixed without being punched (only the melamine sponge is not drilled through the honeycomb core 1), and then fixed with an adhesive tape (11), and then heated by a hot melt adhesive layer when heated. (10) is melted and then hardened so that the upper and lower cases (8) and (9) are completely fixed by the adhesive layer (10), where the glass cloth layer (12) and the lower surface of the lower case (8) The melamine resin sponge 7 covers the glass cloth layer 12 to provide sound insulation and sound absorption, and the melamine resin sponge is non-flammable and only pressed without being penetrated by honeycomb. (6) is not completely sealed While maintaining the honeycomb core 1 while being soundproof and sound-absorbed through the suction hole 6, the foreign matter does not enter and the honeycomb core 1 is supported.

In particular, when the adhesive is used in the glass cloth layer 12 and the melamine resin sponge 7 to support the honeycomb core 1, the suction holes 6 are not blocked because they do not have a sound absorption effect.

In the above, the height of the pusher plate 17 in the mold 14 is adjusted by the first and second foamed phenol resin plates 2 and 3 in the honeycomb core 1 above and below the honeycomb core 1. The first and second foamed phenolic resin boards (2) and (3) each having a thickness equal to the height of the first portion, each with a space equal to 1.5, respectively, with a space equal to 1.5, respectively. It is to be inserted and fixed at a fixed height at the center.

The sound absorption coefficient change according to the size of the suction hole of the lower case 8 constituting the sound absorbing plate of the present invention and the change in the sound absorption coefficient according to the filling position and the state of filling of the foamed phenolic resin plates 2 and 3 will be described below. Same as

Example 1

(Change of Sound Absorption Coefficient (NRC) according to Hole Size and Open Rate)

Measuring frequency Hole size; 개구 3 aperture ratio; 4.9% ￠ 3 5.8% ￠ 3 11% ￠ 3 14% ￠ 5 19.6% ￠ 6 39.3% 250 Hz 0.42 0.61 0.30 0.56 0.56 0.63 500 Hz 0.38 0.63 0.51 0.63 0.71 0.64 1000 Hz 0.43 0.71 0.59 0.71 0.75 0.70 2000 Hz 0.29 0.77 0.66 0.81 0.82 0.78 NRC 0.38 0.68 0.56 0.68 0.71 0.69

Example 2.

(Changes in sound absorption coefficient (NRC) when fully charged (100%) of foamed phenolic resin board in honeycomb core)

Example 3.

(Change of Sound Absorption Coefficient (NRC) when Double Foamed Phenolic Resin Plate is Formed in Honeycomb Core)

The high-performance sound absorbing plate for preventing road traffic noise of the present invention configured as described above is easily absorbed by road traffic noise by the suction hole 6 at the bottom of the sound absorbing plate, and passes through the glass cloth layer 12 and the melamine resin sponge 7 having many pores. The noise is first dispersed and dissipated by the space 5 'formed at the bottom of the sound absorbing plate, and the sound is further absorbed while passing through the second foamed phenol resin plate 3 having a large number of central pores, and then passing through the central space 4 again. The noise is primarily dispersed and dissipated, and after the residual noise is further absorbed while passing through the first foamed phenolic resin board 2 again, the remaining noise is completely dispersed and dissipated in the upper space 5 of the road. The effect is to almost completely absorb and eliminate traffic noise.

As the sound absorption effect is shown in the following graph 1, the average inclination sound absorption coefficient, which is a sound absorption coefficient that can obtain a perfect sound absorption effect at ⅓ octave band center frequency, becomes 0.9 or more. You can see the effect is excellent.

Sound Absorption Graph 1.

Claims (4)

Divide the honeycomb cores which were dipping into the ethylene vinyl acetate resin (EVA) adhesive liquid at six equal heights of the honeycomb cores (1) into 1.5 equal parts from the upper and lower ends of the honeycomb cores (1). The space is to be formed by spaces 5 and 5 ', while the remaining third half of the space is spaced into the space 1 by 1 equal thickness in the center. The suction hole 6 is perforated at a predetermined interval on the bottom of the honeycomb core 1 having a foamed phenolic resin plate composed of inserting as many first and second foamed phenolic resin plates 2 and 3 respectively. The inner surface of the suction hole 6 is bonded to the outer surface of the glass cloth layer 12 having a water repellent treatment, and the inner surface of the suction hole 6 is embedded in a lower case 8 made of a quadrangular cylinder with a predetermined thickness of melamine resin sponge 7. Next, the top and side circumference of the honeycomb (1) and the lower case (8) Between the upper and lower cases (8) and (9), any one selected from ethylene vinyl acetate copolymer resin adhesive, polyethylene resin adhesive, ethylene acrylic copolymer copolymer resin, polyvinyl acetate adhesive, and polyvinyl butyral resin adhesive After forming the adhesive layer (10) of the, combined with the upper case (9) made of a quadrilateral tube and pressed with a compression press 13, the water-repellent glass cloth layer 12 and the melamine sponge (coated on the inner bottom of the lower case) ( 7) Press the bottom of the honeycomb to be in close contact with the bottom surface of the lower case (8) by attaching, fixing or additionally fixing the boundary of the upper and lower cases (8) and (9) with the adhesive tape (11), When the upper and lower cases (8) and (9) are compressed to be in close contact with each other and the hot melt adhesive is used in the above, the adhesive is heated, melted and cured or the adhesive is cured at room temperature. A high-performance sound absorbing plate, characterized in that the upper and lower cases (8) and (9) are cured at room temperature and fixed to each other. The honeycomb core 1 in which the foamed phenolic resin board is embedded has a height of a straw plate 17 that pushes the foamed phenolic resin board to a predetermined height by a spring 15. a ') and the inside of the mold 14 having a depth and a width equal to the height of the honeycomb core a and dividing the entire depth of the honeycomb height except for the height a of the pusher board into six equal parts and forming the mold 14 Internally, a pusher plate 17 which is expanded by a spring 15 to the height of 3.5 equal heights (a) of the honeycomb core and pushes the foamed phenolic resin board is pressed. On the rod 16 of the honeycomb core 1 having a thickness corresponding to 1/6 (1 equivalent) of the depth (height) of the honeycomb core (2) is placed on the ethylene vinyl acetate ( The honeycomb core, which was immediately dipped in the EVA) resin adhesive liquid, was taken out, and then the honeycomb core 1 was uniformly uniformly compressed by the press 13 at the top of the honeycomb core 1. While keeping the height at one level, the first foamed phenol resin plate is compressed by pressing the bottom of the honeycomb core 1 through the gap between the wheat plates 17 to reach the bottom 18 of the wheat plates 17. 2) this space is inserted into the 1.5 equal (1.5 / 6 equal) position (c) from the upper part of the honeycomb core 1 and inserted into the first equal (1/6 equal) position (d) below and dipped. After adhering and fixing with the attached EVA adhesive, the compressed press 13 and the first foamed phenolic resin board 2 are inserted into and fixed in the forming mold 14 in a state where the honeycomb core 1 to which the fixed foam is inserted is fixed. On the lower end of the honeycomb core (1) to the 1.5 equal (1.5 / 6 equal) height (e) of the honeycomb core (e) is expanded by the spring (15) push rod 17 to push up the foamed phenolic resin board Another second foamed phenolic resin board (3) having a thickness corresponding to one-half (1/6) of the depth (height) of the honeycomb core (1) on the rod (16) of the rod (17). Horizontally The honeycomb core 1 into which the first foamed phenolic resin plate 2 was first inserted by the process before the second foamed phenolic resin plate 3, and then to the pressing press 13. Compresses the honeycomb core 1 so that the lower end of the honeycomb core 1 penetrates through the second foamed phenolic resin plate 3 and penetrates the gap between the pusher plates 17 so that the bottom of the pusher plate 17 is closed. (18), and then the pressing press 13 is removed so that the first and second foamed phenolic resin plates (2) and (3) have a space equal to 1 (1/6) equal to the center of the honeycomb core (1). A honeycomb core (1) formed from the mold (14), which was formed to form (4) and was inserted to form a space (5) (5 ') equally equal to 1.5 (1.5 / 6) on the upper and lower sides thereof. A high-performance sound absorbing plate characterized by separating and obtaining a honeycomb core (1) in which the first and second foamed phenolic resin plates (2) and (3) are incorporated. The honeycomb core (1) having the foamed phenolic resin board (1) according to claim 1, wherein the honeycomb core (1) and the first and second foamed phenols are first and second compression presses (13, 13 ') on the upper and lower ends of the honeycomb core (1). The resin plates (2) (3) are pushed in, and then placed in the mold 14 to the air compressor 19 while pressing the honeycomb core 1 with a press 13 at the top of the mold 14. The upper and lower foamed phenolic resin plates 2 and 3 are pushed one by one at a predetermined height one by one by a push rod 16 'which is lifted by the air pressure injected into the injection hole 18, and then from the molding die 14 A high-performance sound absorbing plate characterized by separating and obtaining a honeycomb core (1) in which the first and second foamed phenolic resin plates (2) and (3) are incorporated. The method of claim 1, wherein when the hot melt adhesive is used as the adhesive layer 10 between the upper and lower cases 8 and 9 combined in the above, the heating furnace has a temperature of about 70 to 160 ° C. in about 8 minutes. Method for producing a high-performance sound absorbing plate, characterized in that heating for a time.

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