JP6372989B2 - Soundproof material for compressor and method for producing the same - Google Patents

Description

  The present invention relates to a soundproof material for a compressor and a method for producing the same.

  2. Description of the Related Art Conventionally, for example, a compressor housed inside an outdoor unit of an air conditioner is provided with various soundproofing means for the purpose of suppressing leakage of operation sound emitted from the compressor to the outside. For example, Patent Document 1 discloses a sound insulating material in which a sound insulating sheet made of rubber or the like, a felt-like sound absorbing sheet, and an antifouling sheet made of aluminum foil or the like are laminated in this order. Such a soundproofing material can prevent the oil from being injected and ignited by the compressor in use by placing an antifouling sheet such as aluminum foil on the compressor side, or the oil can penetrate into the sound absorbing material. Or was to avoid.

JP 2011-46182 A

  However, when the aluminum foil is disposed on the compressor side, the sound absorbing performance as a soundproof material is hindered. That is, since the aluminum foil is a non-breathable material, it cannot absorb the operation sound of the compressor, and the sound absorption performance of the felt in the inner layer has not been fully utilized. Moreover, since aluminum foil itself is a hard material, the moldability at the time of soundproof material manufacture and the workability | operativity at the time of attaching to a compressor were not preferable. Furthermore, since aluminum foil is a relatively hard material, there is a drawback that vibration (sound) of the compressor is easily transmitted. In addition, when the sound insulation sheet made of rubber or the like is disposed in the outermost layer, there is a disadvantage that noise reflected by a sheet metal in the indoor unit leaks to the outside of the outdoor unit.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a soundproof material for a compressor having manufacturability and workability while having excellent soundproof performance and a method for producing the same. .

In order to solve the above-described problems, a soundproof material for a compressor according to the present invention is formed of a sound absorbing material having a sound absorbing property and a sound insulating material having a sound insulating property, and a plurality of sound absorbing materials stacked without being fixed to each other A sound-absorbing / sound-insulating sheet comprising two and a non-woven fabric sheet having flame retardancy in which both surfaces of the sound-absorbing / sound-insulating sheet are coated and edge portions are bonded to each other. Features.
In addition, the method for producing a soundproofing material for a compressor according to the present invention includes two non-woven fabric sheets having flame retardancy containing an adhesive that is bonded to at least an edge by heating, a sound absorbing material having sound absorbing properties, and A sound-absorbing / sound-insulating sheet comprising a plurality of sound-absorbing materials and a sound-insulating material, which are formed of a sound-insulating material having sound-insulating properties and stacked without being fixed to each other , and more than the inner dimension of the edge portion of the nonwoven fabric sheet A step of preparing a sound-absorbing / sound-insulating sheet having a small size, a laminating step of sequentially laminating one of the non-woven fabric sheet, the sound-absorbing / sound-insulating sheet, and the other non-woven fabric sheet, and the peripheral portion of the non-woven fabric sheet And a step of thermocompression bonding with each other.

  In the soundproofing material for compressors and the manufacturing method thereof according to the present invention, it is possible to provide manufacturability and workability while having excellent soundproofing performance.

The external view which shows one Embodiment of the soundproof material for compressors which concerns on this invention. Sectional drawing which follows the II-II line | wire of FIG. The enlarged view of the III part of FIG. The top view which shows the soundproof material for compressors in the state installed in the compressor. The elements on larger scale which show the modification of the soundproof material for compressors. Sectional drawing which shows the sample of the soundproof material for compressors as Example 1. FIG. Sectional drawing which shows the sample of the soundproof material for compressors as Example 2. FIG. Sectional drawing which shows the sample of the soundproof material for compressors as the comparative example 1. FIG. The graph which shows the evaluation result of reverberation room method sound absorption coefficient measurement. The longitudinal cross-sectional view for demonstrating the sample of a soundproof material installed in the reverberation box, and a measuring apparatus. The graph which shows the evaluation result of a transmission loss measurement.

  An embodiment of a soundproofing material for a compressor and a method for producing the same according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an external view showing an embodiment of a soundproof material for a compressor according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is an enlarged view of a portion III in FIG.
FIG. 4 is a plan view showing the compressor soundproofing material 1 installed in the compressor 2.

  The soundproofing material 1 for compressors in this embodiment is a soundproofing material attached for the compressor of the outdoor unit for an air conditioning. The compressor soundproofing material 1 (hereinafter simply referred to as “soundproofing material 1”) includes a sound absorbing / sound insulating sheet 10 and two non-woven fabric sheets 15 respectively covering both surfaces of the sound absorbing / sound insulating sheet 10.

  The sound absorbing / sound insulating sheet 10 includes a sound absorbing material 11 and a sound insulating material 14.

  The sound-absorbing material 11 is a felt mainly composed of natural fiber, chemical fiber (synthetic fiber, regenerated fiber, low melting point chemical fiber, etc.), glass wool, felt made of glass fiber molded by needle punching, or a laminate thereof. It is a sheet having sound-absorbing properties such as a fiber aggregate such as a product, and a polyurethane foam having open cells (including a soft polyurethane foam and a hard polyurethane foam). The sound absorbing material 11 is preferably a resin felt having flame retardancy. As shown in FIGS. 2 and 3, the sound absorbing material 11 is provided in three layers or partially in two layers. The sound absorbing material 11 has a thickness of about 1 to 40 mm. From the viewpoint of sound absorption performance, it is preferable that the sound absorbing material 11a disposed on the compressor 2 side when the soundproofing material 1 is installed on the compressor 2 has a thickness greater than the sound absorbing materials 11b and 11c disposed on the outside. . In this case, it is preferable that the sound absorbing material 11a and the sound absorbing materials 11b and 11c have different thicknesses at a ratio of about 1: 2 to 1: 5.

  When the soundproofing material 1 is installed in the compressor 2, the surface disposed on the inner side has a smaller circumferential length than the surface disposed on the outer side. For this reason, the sound-absorbing material 11a is composed of a plurality of sheets arranged with gaps 12 provided at predetermined intervals in order to absorb the difference in circumferential length.

  The sound insulating material 14 is a sound insulating sheet such as an elastomer made of rubber or a thermoplastic resin. The sound insulating material 14 is preferably polyvinyl chloride. The sound insulating material 14 is provided in two layers and is disposed between the sound absorbing materials 11. The sound insulating material 14 has a thickness of about 1 to 6 mm.

  The nonwoven fabric sheet 15 is a nonwoven fabric having appropriate air permeability that does not impair the sound absorbing property of the sound absorbing material 11 bonded to the nonwoven fabric 15. The nonwoven fabric 15 is formed of polyester fiber, low melting point polyester fiber, polypropylene fiber, polyethylene fiber, polyamide fiber, acrylic fiber, urethane fiber, polyvinyl chloride fiber, glass fiber, or the like.

  This nonwoven fabric sheet 15 has flame retardancy. Nonwoven fabric sheet 15 is disclosed in organic flame retardant materials (bromine compounds, phosphorus compounds, chlorine compounds), inorganic flame retardant materials (antimony compounds, metal water, oxides) and Japanese Patent Application Laid-Open No. 2006-83505. By applying and impregnating the flame retardant material, the required flame retardancy can be provided. The flame retardancy is imparted, for example, by applying and impregnating a nonwoven fabric with a thermosetting resorcinol resin composed of monovalent and polyhydric phenols, and then thermosetting. Moreover, a flame retardance can be provided also by containing a flame-retardant fiber.

  The nonwoven fabric sheet 15 contains a thermosetting resin such as a resorcinol resin. Thereby, it shape | molds in a desired shape by hot press molding. The nonwoven fabric sheet 15 further has oil repellency and water repellency. Oil repellency and water repellency are imparted by further impregnating the nonwoven fabric sheet 15 with a fluorine-based water and oil repellent. Moreover, the nonwoven fabric sheet 15 adhere | attaches at least the edge periphery parts 16 of the nonwoven fabric sheet 15 with the thermosetting resin mentioned above. When the thermosetting resin has insufficient adhesiveness due to manufacturing conditions or the like, an adhesive such as a hot melt adhesive is applied. The adhesive is polyethylene, polypropylene, polyolefin resin, polyvinyl chloride, polyurethane, polyester, polyamide, phenol resin, epoxy resin, and the like, and these containing solutions are coated and impregnated on the nonwoven fabric.

The nonwoven fabric sheet 15 covers the sound absorbing / sound insulating sheet 10 and has a size larger than that of the sound absorbing / sound insulating sheet 10 because the peripheral edge portions 16 of the nonwoven fabric sheet 15 are heat-pressed together. That is, the sound absorbing / sound insulating sheet 10 has a size smaller than the edge peripheral portion 16 of the nonwoven fabric sheet 15. Moreover, the nonwoven fabric sheet 15 has a surface weight of about 50 to 200 g / m ² .

  The soundproofing material 1 composed of such members is integrally formed as described later in a state where both surfaces of the sound absorbing / sound insulating sheet 10 are respectively covered with the nonwoven fabric sheet 15. It is preferable that such a soundproofing material 1 satisfies UL94V-0, which is a flame retardant standard, and FMVSS302, which is a US automobile safety standard, in combination with a sound absorbing material 11 such as felt.

  Note that the compressor 2 in which the soundproofing material 1 is used is provided with piping / wiring such as a discharge pipe, a suction pipe, or electric wiring. For this reason, the soundproofing material 1 has the through-hole 18 and the notch 19 for letting these piping and wiring pass. The through hole 18 and the notch 19 are also provided with an edge peripheral portion 16 to be thermocompression bonded.

  Next, a procedure for producing the soundproof material 1 will be described.

  The nonwoven fabric sheet 15 and the sound absorbing / sound insulating sheet 10 are hot press-molded in a laminated state. At this time, the edge peripheral part 16 of the nonwoven fabric sheet 15 is mutually heat-pressed and adhere | attached. That is, the sound absorbing / sound insulating sheet 10 is disposed on the inner side of the peripheral edge portion 16 to be heat-pressed, and the sound absorbing / sound insulating sheets 10 are disposed without being fixed to each other. Thereby, the soundproofing material 1 will house the sound-absorbing / sound-insulating sheet 10 in the sealed bag-like nonwoven fabric sheet 15, and is immediately formed integrally.

  The soundproof material 1 is pressed into a desired shape. Specifically, in the outermost layer on the side where the sound absorbing material 11a is disposed, the nonwoven fabric sheet 15 is formed so as to follow the surface shape formed by the sound absorbing material 11a and the gap 12 (sound insulating material 14). At this time, the nonwoven fabric sheet 15 and the sound absorbing material 11a or the sound insulating material 14 are bonded to each other, but it is not necessary to bond them positively.

  The through-hole 18 and the notch 19 are formed, for example, by being hot press-molded and then punched using a Thomson type / bic type. Moreover, when manufacturing using the simultaneous cutting die which can perform press molding and cutting in one process, the through hole 18 and the notch 19 can be formed at the time of hot press molding. In addition, the edge peripheral part 16 of the through-hole 18 and the cut 19 is heat-pressed simultaneously with the edge peripheral part 16 in the outer periphery of the nonwoven fabric sheet 15.

  As a specific example, the soundproofing material 1 can be manufactured very easily by the following method.

  First, a forming jig is placed on the lower press machine of the press machine. This press machine has a built-in heating device. The forming jig has a shape corresponding to the shape of the peripheral edge portion 16 and the thickness (height) of the soundproofing material 1. The forming jig also has a shape corresponding to the shape and thickness (height) of the gap 12. The forming jig may be formed of a plurality of members or the same member. At this time, the forming jig is heated to a temperature at which the adhesive impregnated into the nonwoven fabric sheet 15 can be bonded, for example, about 200 ° C. at which the resorcinol resin is cured.

  On this forming jig (lower press machine), a nonwoven fabric sheet 15, a sound absorbing / sound insulating sheet 11, and a nonwoven fabric sheet 15 are laminated in this order. When an adhesive such as a hot melt adhesive is applied to the nonwoven fabric sheet 15, the applied surface is disposed so as to overlap the sound absorbing / sound insulating sheet 11 side. The nonwoven fabric sheet 15 and the like are arranged such that the surface arranged on the compressor 2 side when attached to the compressor 2 is the lower surface. At this time, the edge peripheral part 16 used as the crimping | compression-bonding part of the nonwoven fabric sheet 15 is arrange | positioned on a shaping | molding jig. The sound absorbing / sound insulating sheet 11 is not disposed on the forming jig corresponding to the peripheral edge portion 16. The forming jig is also disposed at a position where the gap 12 is formed.

  Next, the upper press disk of the press machine is lowered, and the nonwoven fabric sheet 15 is pressure-bonded with a required pressure by the upper press disk and a forming jig. Thereby, heat is transmitted to the nonwoven fabric sheet 15 from the upper and lower press machines and the forming jig, and the impregnated thermosetting resins are cured (by the hot melt adhesive), thereby bonding the nonwoven fabric sheets 15 together. At this time, the temperature of the upper and lower press panels is preferably around 200 ° C., and the thermocompression bonding time is preferably about 50 seconds.

  Moreover, in the clearance gap 12, the nonwoven fabric sheet 15 is formed so that the surface shape formed with the sound-absorbing material 11a and the clearance gap 12 (sound insulation material 14) may be met. At this time, the nonwoven fabric sheet 15 and the sound-absorbing material 11a and the sound-absorbing material 11c are completely or partially brought into contact with each other by being adjusted by the height of the forming jig or the like. Thereafter, the through hole 18 and the cut 19 are formed.

  In the soundproofing material 1 manufactured in this way, the sheets 10 and 15 are integrally formed by hot press molding. This eliminates the need to manually wind the aluminum foil or glass cloth around the felt as in the case of a conventional soundproof material using a glass cloth made of aluminum foil or glass fiber. Thereby, the manufacturability of the soundproofing material 1 can be improved. Moreover, even if the position and shape of the through-hole 18 are not simple, manufacturing is facilitated. In addition, when heat press molding is performed using the molding jig as described above, the soundproofing material 1 corresponding to the shape of the compressor 2 is easily manufactured by changing the shape and arrangement of the molding jig. be able to.

  Further, the necessary flame retardancy can be ensured by combining the nonwoven fabric sheet 15 itself with the required flame retardance and the flame retardancy of the sound absorbing material 11 disposed inside the nonwoven fabric sheet 15. For this reason, even if the outermost layer in contact with the compressor 2 is a non-woven fabric, ignition by the oil of the compressor 2 can be prevented as a whole. Furthermore, since the edge peripheral part 16 of the nonwoven fabric sheet 15 is securely bonded, it is possible to prevent erosion and ignition of oil and rainwater to the internal sound absorbing material 11, and to prevent deterioration of the sound insulating material 1 itself (durability). As a result, the soundproofing performance can be maintained. Moreover, when the nonwoven fabric sheet 15 is provided with oil repellency and water repellency, the above effects can be further exhibited.

  Furthermore, since the soundproofing material 1 is comprised only from a flexible material, the attachment to the compressor 2 is easy, and workability | operativity can also be improved. Moreover, since the surface which contacts the compressor 2 is the flexible nonwoven fabric sheet 15, the vibration (sound) resulting from the contact of the compressor 2 and the soundproof material 1 can also be suppressed.

  Although the nonwoven fabric sheet 15 (edge peripheral part 16) is heat-pressed and hardened, the sound absorption / sound insulation sheet 10 can maintain flexibility without hardening. For this reason, workability at the time of attachment to the compressor 2 is not reduced. Further, since the sound absorbing and sound insulating sheets 10 are not bonded (fixed), they can move to each other according to the circumferential length of each layer when wound around the compressor 2. For this reason, the workability | operativity at the time of the attachment to the compressor 2 can further be improved.

  The sound absorbing / sound insulating sheet 10 shown in FIGS. 1 to 3 is composed of only the sound absorbing material 11 layer, or the sound absorbing material 11 is composed of two layers and the sound insulating material 14 is composed of one layer as shown in FIG. Also good. In addition, the sound absorbing / sound insulating sheet 10 may include four or more layers of the sound absorbing material 11 and three or more layers of the sound insulating material 14 according to the number of layers of the sound absorbing material 11.

  The shape, thickness, number of layers of the nonwoven fabric sheet 15 and the sound absorbing / sound insulating sheet 10, the shape, position, and number of the through holes 18 and the cuts 19 are the shape of the compressor 2 to which the soundproofing material 1 is attached and the required soundproofing performance. It is decided according to. For this reason, it is not limited to the soundproofing material 1 etc. which were demonstrated in this embodiment.

  Furthermore, an aluminum sheet may be attached to at least a part of the nonwoven fabric sheet 15 disposed on the compressor 2 side in order to prevent ignition by oil of the compressor in use. Thereby, the soundproof material 1 which can respond also to the request | requirement of higher fireproofness can be provided. As a method of attaching the aluminum sheet, after producing the soundproofing material 1 by the above-described process, a method of pasting with an adhesive such as a seal, or laminating the aluminum sheet with polyethylene or the like, and thermally bonding to the soundproofing material 1 at the time of hot press molding. The method can be applied.

  Next, improvement in soundproofing performance and weight reduction of the soundproofing material 1 in the present embodiment will be described using examples. In addition, this invention is not limited to the Example shown below.

[Example 1]
As shown in FIG. 6, a sample of the soundproof material 20 was produced by stacking the nonwoven fabric sheet 25 a, the sound absorbing material 21 a, the sound insulating material 24, the sound absorbing material 21 b, and the nonwoven fabric sheet 25 b in this order from the compressor side. The nonwoven fabric sheets 25a and 25b are made of polyester and coated with a thermosetting resin. The sound absorbing materials 21a and 21b are resin felts. The sound insulating material 24 is made of polyvinyl chloride. The thickness and surface weight of each sheet were as shown in Table 1.

[Example 2]
As shown in FIG. 7, the soundproof material 30 is formed by stacking the nonwoven fabric sheet 35 a, the sound absorbing material 31 a, the sound insulating material 34 a, the sound absorbing material 31 b, the sound insulating material 34 b, the sound absorbing material 31 c, and the nonwoven fabric sheet 35 b in this order from the compressor side. Produced. Each sheet was the same as in Example 1. The thickness and surface weight of each sheet were as shown in Table 1.

[Comparative Example 1]
As shown in FIG. 8, at the time of installation, the soundproof material 40 was produced by laminating the aluminum sheet 42, the sound absorbing material 41a, the sound insulating material 44a, the sound absorbing material 41b, and the sound insulating material 44b in this order from the compressor side. The sound absorbing materials 41a and 41b were made of acrylic fiber, polyester fiber, and low melting point polyester fiber and formed into a sheet by a needle punching method. In addition, the same sound insulating materials 44a and 44b as those in Example 1 were used. As the aluminum sheet, an aluminum foil having a thickness of 50 μm was used. The thickness and surface weight of each sheet were as shown in Table 1.

  Table 1 shows the surface weight ratios of Examples 1 and 2 and Comparative Example 1. The soundproof materials 20 and 30 in the present embodiment were able to realize a weight reduction of 30% or more compared to the soundproof material 40 of Comparative Example 1.

In order to evaluate the sound absorption performance of Examples 1 and 2 and Comparative Example 1, JIS
A reverberation chamber method sound absorption coefficient (random incident sound absorption coefficient) was measured based on A1409. The volume of the reverberation chamber was 9 m ³ , the sample of each sound absorbing material was 1000 mm × 1000 mm, and the measuring device was PULSE of BK. In addition, the incident surface was a surface (a surface that is not the side surface of the compressor) that was outside the compressor when the compressor was installed. FIG. 9 is a graph showing an evaluation result of reverberation chamber method sound absorption coefficient measurement.

  It was found that the soundproofing material 40 of Comparative Example 1 has almost no sound absorbing effect because the outermost layer on the outside of the compressor is the sound insulating material 44b. On the other hand, the soundproofing materials 20 and 30 of Examples 1 and 2 are provided with non-woven sheets 25b and 35b that are breathable also in the outermost layer that is the outer side with respect to the compressor, and the sound absorbing material 21b, Since 31c was arrange | positioned, it turned out that it has a sound absorption performance compared with the soundproof material 40 of the comparative example 1. FIG. As a result, the noise transmitted through the soundproofing material and reflected by the sheet metal in the indoor unit can be soundproofed without leaking outside the outdoor unit. In addition, even when piping or wiring attached to the compressor or a hard member such as a sheet metal adjacent to the compressor due to vibration during outdoor unit operation, the material itself is flexible, The generated vibration noise is suppressed. Note that the soundproofing materials 20 and 30 of Examples 1 and 2 in the same way as Comparative Example 1 are similarly soundproofing when the incident surface is measured as a surface that is on the inner side of the compressor when the compressor is installed. Is considered to be obtained.

Furthermore, in order to evaluate the sound insulation performance of Examples 1 and 2 and Comparative Example 1, transmission loss using a simple reverberation box was measured. FIG. 10 is a longitudinal sectional view for explaining a sample 52 of a soundproof material installed in the reverberation box 51 and a measuring device. The reverberation box 51 has an upper opening covered with the soundproof materials 20 and 30 supported by the support frame 55. The semi-anechoic room in which the reverberation box 51 was installed was 480 m ³ . In addition, the speaker 53 is installed below the reverberation box 51, and the microphone 54 is installed outside the reverberation box 51 and above the speaker 53. The sound incident surface was the side of the compressor when the compressor was installed. FIG. 11 is a graph showing the evaluation results of the transmission loss measurement.

  The soundproofing material 20 of Example 1 improved the sound insulation performance as compared with the soundproofing material 40 of Comparative Example 1 in a particularly low frequency range of 315 Hz to 1.25 kHz. The soundproof material 30 of Example 2 exceeded the sound insulation performance of the soundproof material 40 of Comparative Example 1 in a particularly high frequency range of 800 Hz to 2.5 kHz.

  As can be seen from FIG. 9 and FIG. 11, the soundproof materials 20 and 30 in Examples 1 and 2 can reduce the weight by 30% or more compared to Comparative Example 1, and at the same time improve the soundproof performance.

1 Soundproofing material for compressors (soundproofing material)
2 Compressor 10 Sound Absorption / Sound Insulation Sheet 11 Sound Absorption Material 12 Gap 14 Sound Insulation Material 15 Non-woven Fabric Sheet 16 Edge Peripheral 18 Through Hole 19 Cutting

Claims (14)

A sound-absorbing and sound-insulating sheet comprising a plurality of sound-absorbing materials and sound-insulating materials, which are formed of a sound-absorbing material having sound-absorbing properties and a sound-insulating material having sound-insulating properties, and laminated without being fixed to each other;
Two non-woven fabric sheets having flame retardancy in which both surfaces of the sound-absorbing and sound-insulating sheet are respectively coated and the peripheral edges are bonded to each other;
A soundproofing material for a compressor, comprising:   The soundproof material for a compressor according to claim 1, wherein the sound absorbing material and the sound insulating material are alternately arranged in a thickness direction of the soundproof material for the compressor.   3. The compression according to claim 2, wherein the sound absorbing and sound insulating sheet is a five-layer sheet in which a sound absorbing material, a sound insulating material, a sound absorbing material, a sound insulating material, and a sound absorbing material are laminated in this order in the thickness direction of the compressor sound insulating material. Soundproof material for machine.   The sound-absorbing / sound-insulating sheet according to claim 2, wherein the sound-absorbing / sound-insulating sheet is a three-layer sheet in which a sound-absorbing material, a sound-insulating material, and a sound-absorbing material are laminated in the thickness direction of the compressor sound-insulating material.   The sound-absorbing material for a compressor according to claim 3 or 4, wherein the sound-absorbing material arranged on the inner side when installed in the compressor comprises a plurality of sound-absorbing materials arranged with a gap at predetermined intervals. The sound absorbing material is a felt sheet;
The sound insulation material for a compressor according to any one of claims 1 to 5, wherein the sound insulation material is a polyvinyl chloride sheet.   The sound absorbing / sound insulating sheet has a size smaller than the inner size of the peripheral edge portion of the nonwoven fabric sheet, and is housed in the sealed bag-like nonwoven fabric sheet. The soundproofing material for a compressor according to the item.   The soundproofing material for a compressor according to any one of claims 1 to 7, which is a soundproofing material used by being wound around a compressor. The soundproof material for a compressor according to any one of claims 1 to 8, wherein the nonwoven fabric sheet and the sound absorbing / sound insulating sheet are not bonded to each other. The compression according to any one of claims 1 to 9 , further comprising a through-hole and a cut for passing piping or wiring, wherein the through-hole and the cut have an edge peripheral portion to which the nonwoven fabric sheets are bonded to each other. Soundproof material for machine. The soundproofing material for compressors as described in any one of Claims 1-10 with which the aluminum sheet was attached to at least one part of the said nonwoven fabric sheet arrange | positioned at the compressor side. Formed with at least two nonwoven fabric sheets having flame retardancy containing an adhesive that is bonded to the periphery by heating, a sound-absorbing sound-absorbing material, and a sound-insulating material having a sound-insulating property, without being fixed to each other A sound absorbing / sound insulating sheet comprising a plurality of laminated sound absorbing materials and sound insulating materials, and preparing a sound absorbing / sound insulating sheet having a size smaller than a size inside the edge portion of the nonwoven fabric sheet,
Laminating step of sequentially laminating one non-woven fabric sheet, the sound absorption / sound insulation sheet, and the other non-woven fabric sheet,
A step of thermocompression bonding the peripheral edges of the nonwoven fabric sheet;
A method for producing a soundproof material for a compressor, comprising: A step of arranging a forming jig having a shape corresponding to the shape of the peripheral edge of the nonwoven fabric sheet and heated to the bonding temperature of the adhesive on a lower press plate of a press machine;
Further comprising the step of arranging the non-woven fabric sheet and the sound-absorbing / sound-insulating sheet laminated in the laminating step so that the peripheral edge of the non-woven fabric sheet is arranged on the forming jig,
The soundproofing for a compressor according to claim 12 , wherein the thermocompression bonding step is a step in which the peripheral portions of the non-woven fabric sheet are thermocompression bonded to each other at a required pressure by an upper press disk and the forming jig of the press machine. A method of manufacturing the material. Further comprising a step of forming a through hole and a cut for passing a pipe or wiring;
In the step of forming the through hole and the cut, the through hole where the nonwoven fabric sheet is bonded to each other and the edge peripheral portion of the cut are formed in the thermocompression bonding step, and after the thermocompression bonding step or the thermocompression bonding step. The method for producing a soundproof material for a compressor according to claim 12 or 13, which is a step of forming the through hole and the cut at the same time.

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