KR20130107255A - Sound reflection board using corrugated cardboard - Google Patents

Abstract

PURPOSE: A sound reflection board using a corrugated cardboard is not easily damaged by external impact and easily handled with a lightweight property. The sound reflection board allows a user to reduce manufacturing costs and operation costs. CONSTITUTION: A sound reflection board using a corrugated cardboard includes the corrugated cardboard of a curved shape as an upper plate and a lower plate, and a curved middle plate (513) is installed between the upper plate and the lower plate. The middle plate comprises a honeycomb, a honeycomb PS-CELL, and the corrugated cardboard. An external frame comprised of reinforced plastics or aluminum is connected to the right end, the left end, the upper end, and the lower end of the curved plate.

Description

SOUND REFLECTION BOARD USING CORRUGATED CARDBOARD}

The present invention relates to an acoustic reflector for a stage device, and more particularly, to an acoustic reflector manufactured by using a curved panel made of corrugated paper that is light, easy to handle, and inexpensive to manufacture.

The acoustic reflector prevents the sound produced during performance such as effect sound for directing, orchestral sound, solo or chorus from being scattered to the upper, side and rear sides of the stage in a wide stage space, It allows the performers to precisely reach the audience, and the performer can hear the sound of his or her instrument and the performers accurately and precisely, thereby obtaining the best harmony and effectively preventing external noise such as wind, After the performance is finished, the ceiling acoustic reflector, the side acoustic reflector, and the rear acoustic reflector are folded or folded on the side or rear of the stage.

) 평철 브라켓(B1)을 사용하여 천장의 파이프 골격 구조에 볼트결합 한다(도 1c 나).In the conventional panel structure of an acoustic reflection plate, Japanese Patent Laid-Open Publication No. P2001-252483 (Patent Document 1a) states, “A rigid board and a decorative plate are coated on an honeycomb panel by laminating an adhesive between each layer and then laminated in a female or male frame. The process of pressurizing while positioning and humidifying ”is disclosed by the manufacturing method, and the method of mounting the acoustic reflector is disclosed by claim as a device that is suspended to the ceiling using a thin wire (FIG. 1A). In addition, in the Utility Model Registration No. 0232115 (Patent Document 2), a panel (FIG. 1B) having a medium density fiberboard on its center and a honeycomb pad on its center is forcedly bonded to the frame with a predetermined curved surface angle, Panel manufacturing method. In addition, to complete the acoustic reflector facility, several reflector panels must be connected to each other and installed on the ceiling.

) Bolted to the pipe skeleton of the ceiling using a flat iron bracket (B1) (Fig. 1c b).

However, it is true that the conventional acoustic reflector is very heavy because most of it is made of plywood or MDF. Therefore, there is a problem that a lot of energy is consumed in the operation of hanging the ceiling, that is, driving, there is a risk of breakage during movement, and because it is forcedly coupled, deformation is likely to occur due to its restoring force. In addition, there is a disadvantage in that the solid bracket coupling structure used when combining the reflecting plate is difficult to combine, and the sound reflection efficiency is reduced due to leaking of a triangular gap between adjacent acoustic reflecting plates.

Accordingly, the present inventors have a method of preventing the deformation of the reflector plate, when manufacturing the panel, the upper plate and the lower plate is put into a curved frame (mold) to a high frequency treatment to fix the curved surface to prevent deformation, trapezoidal frame or F-shaped frame, The sound reflecting plate of the new configuration, which can enhance the sound reflecting efficiency by installing the sound reflecting plate by using a hollow frame so as not to create a gap while being firm, was developed by the prior art design of Utility Model Registration No. 0368147 (Patent Document 3). have.

2A is an exploded perspective view of an acoustic reflector 100 composed of a honeycomb core and plywood of the prior art (patent document 3). The acoustic reflector panel 110 includes an upper plate 111, a honeycomb core 113, and a lower plate 112. The upper plate and the lower plate are formed by a conventional method A laminate of plywood and / or MDF was laminated and the curved surface was fixed by high-frequency treatment, and then a honeycomb core was sandwiched between the upper and lower plates and pressed with a hydraulic press. A trapezoidal frame 120 is attached to both sides of the panel 110, and an end frame 130 is attached to the upper and lower ends of the panel 110 to complete the acoustic reflector.

FIG. 2B is a partial cross-sectional view showing a state in which two acoustic reflective plates 100 of FIG. 2A are coupled using a trapezoidal frame 120. FIG. The acoustic reflector 100 is coupled to each other using the coupling grooves 125 of the trapezoidal frame 120. The flat nuts 121 and 121 'are inserted into the coupling grooves 125 and 125' (122) are coupled to each other by fixing bolts (123). And then connected to the steel plate 150 and the steel square pipe 140 by bolts to be used as a ceiling acoustic reflector, a front acoustic reflector, and a side acoustic reflector. The acoustic reflection plate panel 110 of the prior art was manufactured by laminating members made of plywood and / or MDF. The acoustic reflection plate requires excessive energy for driving due to the weight of the plywood and MDF member. There is a problem such as complexity.

FIG. 2C is an exploded perspective view of an acoustic reflector of the prior art designed in Patent Document 4, and the F-shaped frame 230 is coupled to the upper and lower ends of the wide curved panel 210 having a wide curved surface. The F-shaped frame 220 is coupled to the acoustic reflector 200 is shown. FIG. 2D is a partial longitudinal cross-sectional view of the acoustic reflector 200 of FIG. 2C, showing a state in which the curved panel 210 is coupled to the F-type frame 230. The curved panel 210 of the line technology acoustic reflection plate has a structure in which a top plate 211 made of melamine cardboard and two plywood, a honeycomb pad 213, a bottom plate 212 made of two plywood and melamine cardboard are laminated. As the middle plate interposed between the upper plate 211 and the lower plate 212, the honeycomb pad 213 is interposed therebetween. The F-shaped frame 230, like the trapezoidal frame, has the advantage of achieving a tight and tight coupling, and by attaching the bolts and nuts to each other by making holes 215 at any position of the F-shaped or F-shaped tail. It can be easily combined with each other, and it is easier to combine neighboring acoustic reflectors in this way.

Japanese Patent Laid-Open No. P2001-252483 ('Ceiling Acoustic Reflector Apparatus') Utility Model Registration No. 0232115 (Acoustic reflector for stage) Registered Utility Model No. 0368147 ('Aluminum Frame Acoustic Reflector') Utility Model Registration No. 0397077 ('Curved Panel for Acoustic Reflector and Acoustic Reflector Using It') Utility Model Registration No. 0455370 ('Acoustic Reflector Panel and Acoustic Reflector Using It')

It is an object of the present invention to provide a curved panel for a high rigidity acoustic reflection board which is light in weight and easy to handle and which is not easily damaged by external impact.

It is also an object of the present invention to provide a curved panel for an acoustic reflection board using corrugated cardboard which can be manufactured at a significantly lower cost than conventional plywood or MDF.

Another object of the present invention is to provide a light reflecting plate that is light and easy to handle and inexpensive by manufacturing a combination of a corrugated board, a reinforced board, and a board of a curved panel.

In addition, the present invention is to provide a sound reflecting plate having a high sound reflection efficiency of the sound reflecting efficiency of the sound reflection plate is not only because the sound of the sound reflection boards are excellent, but also close coupling is possible.

The present invention includes an upper plate and a lower plate, a middle plate interposed between the upper plate and the lower plate, wherein the upper plate and the lower plate, the middle plate is bonded by an adhesive and pressed by a hydraulic press integrally formed in the curved panel for acoustic reflection plate, the upper plate and The lower plate is made of cardboard or cardboard, the middle plate is characterized in that the honeycomb pad, honeycomb PS-CELL, characterized in that consisting of one selected from the corrugated cardboard, the present invention is the upper and lower end of the curved panel and the end frame and the outer frame Characterized in that the acoustic reflection plate manufactured by combining.

In the present invention, the cardboard is characterized in that one selected from one-sided cardboard, double-sided cardboard, double-sided cardboard, triple cardboard.

In the present invention, the single-sided cardboard, double-sided cardboard, double-sided cardboard, triple corrugated cardboard is characterized in that the corrugated cardboard bonded to the liner and the normal corrugated core or reinforced corrugated double or triple.

In the present invention, the liner is characterized in that the one selected from kraft liner, jute liner, special liner.

In the present invention, the common core wick is a core wick made of paper made of a short fiber high paper pulp (KOCC), the reinforcement wick is a long fiber high paper pulp (AOCC) and / or all pulp (virgin pulp), or a mixture thereof Corrugated paper made from paper made of pulp as a material, and special corrugated paper made of kraft paper.

In the present invention, the cardboard is characterized in that the one selected from manila cardboard, hard cardboard, cardboard, kraft paper.

In the present invention, the upper and lower ends of the curved panel, and the left and right ends of the cross-section is characterized in that it further comprises any one of the outer frame selected from trapezoidal, F-type, hollow.

In the present invention, the outer frame material is characterized in that any one selected from aluminum, synthetic resin or reinforced plastic.

Compared with the conventional plywood or MDF acoustic reflection plate, the acoustic reflection plate of the present invention is not only easy to handle due to its light weight, but also significantly reduces manufacturing and operating costs, and is not easily damaged by external shocks. It is possible to manufacture environmentally friendly acoustic reflector panels by using a material with rich properties and recyclability. In addition, the sound reflection board of the present invention is excellent in sound reflection effect, the audience can enjoy the live sound.

1A is a perspective view of a conventional ceiling acoustic reflector apparatus.
1B is another conventional acoustic reflector panel perspective view
1C) is a partial cross-sectional view showing a state where two negative reflection plates are combined
2A is an exploded perspective view of the prior art acoustic reflector of Patent Document 3
FIG. 2B is a partial cross-sectional view showing a state in which two acoustic reflectors are combined;
Figure 2c is an exploded perspective view of the acoustic reflection plate of the line technology design of Patent Document 4
FIG. 2D is a longitudinal sectional view of the acoustic reflector of the present invention of FIG. 2C
3A is an exploded perspective view of a curved panel for an acoustic reflection plate according to the first embodiment of the present invention;
Figure 3b is a partial cross-sectional view of the double-sided corrugated cardboard for acoustic reflection plate of the first embodiment of the present invention
Figure 3c is a perspective view of the honeycomb pad for the acoustic reflection plate of the first embodiment of the present invention
Figure 4a is an exploded perspective view of the acoustic reflector coupled to the hollow outer frame to the curved panel of the first embodiment of the present invention
FIG. 4B is a cross-sectional view of the acoustic reflector of FIG. 4A
Figure 5a is an exploded perspective view of the curved panel for the acoustic reflection plate according to the second embodiment of the present invention
FIG. 5B is a cross-sectional view illustrating a stacked state of the curved panel of FIG. 5A.
Figure 6a is an exploded perspective view of the curved panel for the acoustic reflection plate according to the third embodiment of the present invention
FIG. 6B is a cross-sectional view illustrating a laminated state of the curved panel of FIG. 6A.
Figure 7a is an exploded perspective view of the curved panel for the acoustic reflection plate according to the fourth embodiment of the present invention
FIG. 7B is a cross-sectional view illustrating a laminated state of the curved panel of FIG. 7A.

The object of the invention is achieved by a new combination of corrugated cardboard, cardboard and honeycomb provided according to the invention, and a panel for acoustic reflection boards produced through the combination.

The present invention is characterized by using a paper material instead of a conventional plywood, MD or synthetic resin plate material as the upper plate or lower plate material in the production of the acoustic reflection plate. To date, there have been no examples of manufacturing the top and bottom plates of acoustic reflective plate curved panels using materials other than plywood or MDF.

The present invention is achieved by an acoustic reflection plate made of a curved panel of the upper and lower plates made of cardboard or cardboard, and a middle plate made of cardboard, honeycomb or honeycomb PS-CELL in the middle.

The present invention is also achieved by a curved panel acoustic reflection board having a structure in which one of the middle plate selected from corrugated cardboard, single-sided cardboard, double-sided cardboard, triple cardboard.

The present invention is also made by a top panel and a bottom plate made of cardboard, a curved panel acoustic reflection plate of the structure interposed between the one selected from the honeycomb, honeycomb PS-CELL, single-sided corrugated cardboard, double-sided corrugated cardboard, triple corrugated cardboard between Is achieved. Hereinafter, the specific configuration of the present invention will be described in detail.

In the present invention, in order to improve the strength of the acoustic reflector, a honeycomb pad having a liner attached to the honeycomb up and down as a medium plate, or a honeycomb PS-CELL having a diaphragm 713a inserted into each honeycomb cell can be used. In addition, the use of corrugated cardboard instead of the honeycomb can simplify the manufacturing process, it is possible to manufacture a rigid acoustic reflector corresponding to the honeycomb pad.

In the present invention, a pair of liners covering the upper and lower surfaces of the corrugated core is located on the outer surface of the corrugated cardboard is said to be a surface liner, located on the inner surface is a back liner, the surface liner and the back liner may be the same or different. have. In general, the surface liner is manufactured by a multi-ply paper type, and when the multi-ply paper is manufactured, it is easy to produce high basis weight paper and efficiently use low-grade raw materials to reduce production costs, and also improve physical properties and give new functions. For this reason, in the present invention, in order to maintain the diversity of the product, the multi-ply paper is mainly selected and used. Usually, it is produced by attaching 3 to 7 layers.

Among the liners used in the present invention, the kraft liner is a high-strength liner made of 100% kraft pulp, and the jute liner is manufactured by using high paper together. There are water resistant liner, water liner, water repellent liner, and back liner treated with paraffin wax, synthetic resin and film for moisture proof and waterproof.

As the corrugated cardboard mainly used in the present invention, a double-sided corrugated cardboard in which a liner and a reinforcement corrugated sheet is double-bonded is preferable, but various types such as double-sided corrugated cardboard and triple corrugated cardboard may be used. It is preferable to use a special liner as needed, and a liner and a core are appropriately combined with a reinforcement core instead of a general core. These combinations are determined according to the required physical properties, which can be made of double-sided corrugated cardboard that is waterproof and moisture-proof by adhering a reinforced corrugated core to a liner immersed in a mixed solution of paraffin wax and synthetic resin. It may be a three to six-fold corrugated cardboard manufactured by combining a plurality of common core cores and special core cores. Also, the case of corrugated paper may vary depending on the type of pulp paper used to make the corrugated paper used. General purpose corrugated paper is made of ordinary corrugated paper made using recycled paper, but corrugated paper that requires strength is made of reinforced corrugated paper made of long fiber paper. Manufacture. Honeycomb in that paper is used as the main material of the acoustic reflector panel, which is a feature of the present invention, the material is preferably paper, but aluminum honeycomb may be used for a special purpose (weight reduction).

Hereinafter, a specific configuration of the present invention will be described with reference to the embodiments and the drawings.

Example 1

3A to 3C, the curved panel 300 for the acoustic reflection board according to the present embodiment includes a top plate 311 made of a double-sided corrugated cardboard, a middle plate 313 made of a honeycomb pad, and a bottom plate 312 made of a double-sided corrugated cardboard. It is composed. The double-sided corrugated paper constituting the upper plate 311 and the lower plate 312 is a laminated plate having a thickness of 5 mm to 6 mm by alternately bonding two corrugated cores 311b and three liners 311a, and the upper plate 311 and the lower plate. The middle plate 313 made of a honeycomb pad interposed between the 312 is manufactured by adhering the liners 313a and 313b to the front and rear surfaces of the honeycomb core 313c. The honeycomb core 313c means an intermediate material made of a honeycomb-shaped cell (CELL) manufactured by a conventional recycled paper.

Liner 311a, 313a, and 313b used in this embodiment is a liner paper having a burst strength of 5.0 to 5.1 kgf / cm 2 produced by dipping B grade kraft paper made of long fiber paper into a immersion solution of paraffin wax and acrylic synthetic resin composition. [Asease Co., Ltd., AK180; Trade name].

The double-sided corrugated cardboard of the present embodiment is a corrugated cardboard having sufficient rigidity and moisture resistance for use in acoustic reflecting plates, although the rigidity is not only plywood. After applying an adhesive to the upper plate 311 and the lower plate 312 the adhesive surface of the double-sided corrugated cardboard, and then bonded to the middle plate 313 made of a honeycomb pad, the heating wooden frame made in a curved shape of 1.5m or 3m radius When the cured adhesive is applied by applying high frequency heating at 60 ° C. to 80 ° C., the curved panel 310 having the bending fixed is completed. Of course, instead of high frequency, a hot plate can be used to cure the adhesive to fix the curved surface. The curved panels are all made of paper as raw materials, but the curved surfaces are not stretched or deformed over time. As the adhesive used in the present embodiment, a general-purpose paper such as epoxy resin, vinyl acetate resin, and resin for wood may be used. In this embodiment, the honeycomb pad used for the acoustic reflection plate was formed by attaching a surface liner and a back liner to a honeycomb core manufactured using a long fiber sheet.

The acoustic reflector curved panel 310 manufactured as described above is a corrugated board-honeycomb pad-corrugated board structure, and hollow frames 320 and 320 'are coupled to side edges, and end frames 330 and 330' are coupled to upper and lower ends. The sound reflection plate 300 of the configuration is completed.

4A is an exploded perspective view of the acoustic reflector 300 of the first embodiment of the present invention.

FIG. 4B is a cross-sectional view of the acoustic reflection plate 300 having the hollow frame 320 coupled to the left and right ends of the curved panel 310 of the present invention. The hollow frame 320 has a generally long rod-shaped frame body 321, the curved panel end insertion groove 322 formed so that the corner end of the curved panel 310 is inserted from one side along the length of the frame body 321 Is provided, the longitudinal connection guide groove 324 formed on the other side opposite the length of the frame body 321 is provided. The curved panel end insertion groove 322 has the same slope as the curved panel so that the end of the curved panel 310 can be press-fitted, so that the curved panel can be firmly fixed. The longitudinal connection guide groove 324 is one of structures for coupling the two reflector panels 310 in the longitudinal direction, that is, in the longitudinal direction of the panel frame 320. The coupling structure further includes a longitudinal connecting hollow 323 formed on the inner side along the length of the frame body 321. In addition, the hollow frame 320 ′ attached to the other side of the curved panel 310 may also have the same structure (symmetry structure) as the hollow frame 320. The longitudinal connection hollow 323 formed in the inner side along the length of the frame body 321 of the hollow frame 320 is preferably a cross-sectional shape having an outer edge of the concave-convex shape of the symmetrical structure with respect to the center thereof. As shown in the figure, grooves are formed in each of the outer edges of the rectangular cross section.

[Example 2]

5A and 5B, the curved panel 510 for the acoustic reflection plate according to the present embodiment includes a top plate 511 made of a double-sided corrugated cardboard, a middle plate 513 made of a honeycomb PS-CELL in the middle, and a double-sided corrugated cardboard. The lower plate 512 is configured. The double-sided corrugated paper constituting the upper plate 511 and the lower plate 512 as shown in FIG. 5B is a laminated plate having a thickness of 5 mm to 6 mm by alternately bonding two corrugated cores 511 b and three liners 511 a, and in the middle thereof. The intervening medium plate 513 is a honeycomb PS-CELL formed by forming a diaphragm 513a between honeycomb cells, and has a structure of corrugated board-honeycomb PS CELL-corrugated board.

In the present embodiment, the curved panel 510 was manufactured in the same manner as in Example 1 except that the honeycomb PS CELL was used instead of the honeycomb pad of Example 1 in the middle plate 513.

[Example 3]

6A and 6B, the panel for the acoustic reflection plate of the present invention is composed of an upper plate 611 made of a double-sided corrugated cardboard and a lower plate 612 and a middle plate 613 made of a double-sided corrugated cardboard. The double-sided corrugated cardboard is a laminated board having a thickness of 5 mm to 6 mm by alternately bonding two corrugated cores 611b and three liners 611a, and is doubled between the upper plate 611 and the lower plate 612 made of double-sided corrugated cardboard. A laminated plate curved panel 610 having a total thickness of 15 mm to 18 mm was manufactured by interposing a middle plate 613 made of a double-sided corrugated cardboard. The curved panel 610 according to the present embodiment has a structure of cardboard-cardboard-cardboard. The curved panel 610 of the present example was manufactured in the same manner as in Example 1 except that the double-sided corrugated cardboard was used instead of the honeycomb pad of Example 1 in the middle plate 613.

Example 4

Referring to Figures 7a to 7b, the panel for the acoustic reflection plate of the present invention is composed of a top plate 711 and a bottom plate 712 made of cardboard and a double plate 713 made of double-sided cardboard. The double-sided corrugated cardboard is a laminated board having a thickness of 5 mm to 6 mm by alternately bonding two corrugated sheets 711b and three pieces of liner 711a, and double-sided corrugated cardboard in the middle of the upper plate 711 and the lower plate 712. The laminated plate curved panel 710 having a total thickness of 10 mm to 15 mm was manufactured by interposing a middle plate 713.

This embodiment curved panel 710 has a structure of cardboard-double-sided corrugated cardboard-cardboard. The curved panel 710 according to the present embodiment uses hardboard paper instead of the double-sided corrugated cardboard of the first embodiment as the upper plate 711 and the lower plate 712, and double-sided corrugated cardboard instead of the honeycomb pad as the middle plate 713. A curved panel and an acoustic reflection plate were manufactured in the same manner as in Example 1.

The present invention shows that the upper plate and the lower plate constituting the curved panel of the acoustic reflection plate are all made of cardboard or cardboard, and the middle plate can also be made of cardboard in addition to honeycomb, honeycomb PS-CELL. The acoustic reflection plate of the new configuration as described above, which has not been known in the art so far, is light and durable, easy to handle, and has an excellent effect in terms of acoustic reflection efficiency. In addition, the manufacturing cost is low. In addition, various outer frames may be coupled to the side of the curved panel. A trapezoidal frame, an F-shaped frame, or a hollow frame may be used to achieve close coupling without gaps when adjacent reflectors are coupled to each other. In this case, the close coupling between the reflecting plates maintains a strong binding force. In addition, there is an advantage that the sound reflection effect can be increased because there is no sound lost between the gaps. There is also a great difference in the sound reflection effect between combining the acoustic reflection plate without a gap and combining the gap therebetween. For example, when the size of the original sound (playing sound) is 1, the prior art Patent Document 1 In the case of -252483), assuming that 20% of the sound is leaked between the suspended reflector and the reflector interval, the loudness reached by the audience is 1.6 plus the original 0.8 and the reflected sound 0.8. In the case of Utility Model Registration No. 0232115 in the prior art Patent Document 2, when the sound is about 10% leaked out by the interval δ of the triangular shape, the volume of sound is 1.8 by adding the original sound 0.9 and the reflection sound 0.9. Able to know. However, when the sound insulation effect is perfect, the original sound 1 and the reflected sound 1 are summed to 2 and are delivered to the audience. Of course, there may be some difference in the actual sound loss rate, but the sound reflection plate of the patent document 1, the sound reflection plate of the patent document 2 is reduced by 0.2, whereas the sound reflection plate of the present invention is not leaking sound, Since the audience feels, it can be said that the volume is as much as 0.2 compared with the said patent document 2, and 0.4 compared with patent document 1. That is, the sound volume of the sound reflection board of the present invention, based on the loss rate of sound, leads to the conclusion that a synergistic effect may occur at a difference of 1.4 times compared to Patent Document 1 and 1.2 times compared to Patent Document 2. The sound scattering problem is also pointed out in Patent Document 2, "There was a problem that the original sound is not appreciated by the volume of the volume exiting from the outside" (published on page 3, line 16-17).

In the above description, the present invention has been described through specific embodiments, but various modifications may be made to those skilled in the art by referring to and combining various features described herein. Therefore, it should be pointed out that the scope of the present invention should not be limited to the described embodiments, but should be interpreted by the appended claims.

The present invention is installed in the upper part, side part, and rear part of the stage to effectively send the sound on the stage to the audience or to return a part of the reflection sound to the performer on the stage to prevent the sound from being dispersed and to sufficiently transmit the sound. Widely used in the field of acoustic reflection board.

For the beautiful appearance of the acoustic reflection board, solid wood pattern paper, synthetic paper, etc. can be bonded to the surface of the corrugated paper, and can be made in various thicknesses and sizes according to the demand of the consumer.

100, 200, 300: acoustic reflection plate 120: trapezoidal frame
110, 210, 310, 510, 610, 710: acoustic reflection panel curved panel
113, 313c: Honeycomb core 130: end frame
213: honeycomb pad 220: F frame
230; F frame 311a, 313a, 313b: liner
311b, 511b, 611b, 713b: reinforcement core
313, 513, 613, 713: Medium 320, 320 ': Hollow frame
330, 330 ': end frame 513a: diaphragm

Claims (8)

In the upper panel and the lower plate, the middle plate interposed between the upper plate and the lower plate, wherein the upper plate and the lower plate, the middle plate is bonded by an adhesive and pressed by a hydraulic press in the curved panel for acoustic reflection plate,
The upper plate and the lower plate is made of cardboard or cardboard, the middle plate is characterized in that by combining the end frame and the outer frame to the curved panel consisting of one selected from the honeycomb pad, honeycomb PS-CELL, corrugated cardboard, using a cardboard Acoustic reflector. The method according to claim 1, wherein the corrugated cardboard is a single-sided cardboard, double-sided cardboard, double-sided cardboard, triple cardboard, characterized in that one of the corrugated cardboard, characterized in that the acoustic reflector using a cardboard. The acoustic reflective plate according to claim 2, wherein the single-sided corrugated cardboard, the double-sided corrugated cardboard, the double-sided corrugated cardboard, and the triple corrugated cardboard are corrugated cardboard obtained by double or triple bonding of the liner and the corrugated cardboard. According to claim 3, The liner is a liner selected from kraft liner, jute liner, a special liner, the corrugated corrugated cardboard, characterized in that the corrugated cardboard selected from one of the core core, reinforced core core or special core core . The method of claim 1, wherein the cardboard is manila cardboard, hard cardboard, cardboard, kraft cardboard, characterized in that the selected one of the cardboard, the acoustic reflective board using cardboard. The method of claim 4, wherein the liner is a liner immersed in a solution mixed with paraffin wax and synthetic resin, characterized in that the waterproof and moisture-proof corrugated cardboard produced by adhering the immersion liner and the corrugated core, the acoustic reflection plate using corrugated paper. The method according to any one of claims 1 to 7, wherein the upper and lower ends of the curved panel is coupled to the end frame, the left and right ends of the cross-section of any one of the outer frame selected from trapezoidal, F-type, hollow type Characterized in that the sound reflection board using cardboard. The method according to claim 8, wherein the end frame and the outer frame, the material is one of aluminum, synthetic resin or reinforced plastic, characterized in that the acoustic reflection plate using corrugated cardboard.

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