Laminated sound-absorbing plate and manufacturing method thereof

Abstract

The invention relates to the technical field of sound-absorbing boards, and discloses a film-coated sound-absorbing board and a manufacturing method thereof.The film-coated sound-absorbing board comprises a double-layer sound-absorbing board, films and surface cloth, the double-layer sound-absorbing board is composed of a sound-absorbing board A and a sound-absorbing board B, the films comprise the film A, the film B, the film C and the film D, and the film B is compounded on the upper face and the lower face of the sound-absorbing board A; the film D and the film C are compounded on the upper and lower surfaces of the acoustic board B, and a glue layer B is arranged between the film B and the film C; the two pieces of surface layer cloth are the surface layer cloth A and the surface layer cloth B which are located on the outer layer of the acoustic board A and the outer layer of the acoustic board B respectively, the surface of the film D is bonded with the surface layer cloth A through the glue layer A, and the surface of the film A is bonded with the surface layer cloth B through the glue layer C. According to the invention, easy and firm rubberizing is realized through surface film coating, the sound absorption effect is improved, and a waterproof function is achieved; the structural improvement enables production and attachment to be convenient, easy stacking of the sound-absorbing boards can be achieved, and the application scene is expanded.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sound-absorbing panels, and particularly relates to a coated sound-absorbing panel and a manufacturing method thereof. BACKGROUND

[0002] In modern society, with the continuous improvement of people's requirements for sound environment quality, sound-absorbing materials are increasingly widely used in various scenes. In the field of architectural acoustics and decoration (such as theaters, concert halls, hotels, shopping malls, etc.), sound-absorbing materials are needed to control the reverberation time and improve the sound experience; in office spaces (such as open office areas and quiet cabins), sound-absorbing materials are relied on to reduce noise interference and improve work efficiency; in industrial scenes (such as factory buildings and equipment rooms), sound-absorbing materials are needed to reduce mechanical noise and ensure the safety of the production environment; in the field of transportation (such as cars, high-speed rails, and aircraft interiors), sound-absorbing materials are used to reduce the spread of engine noise and wind noise and improve the comfort of passengers. In addition, there is a growing demand for sound-absorbing materials in home spaces (such as home theaters and music rooms) and creative furniture (such as sound-absorbing tables and chairs, and screens), which not only require good acoustic performance but also need to meet the requirements of decoration and installation convenience.

[0003] As one of the mainstream sound-absorbing materials, the core function of a sound-absorbing panel is to absorb sound wave energy through its structure (such as porosity and fiber arrangement) to reduce noise and echo. Traditional sound-absorbing panels are mostly made of polyester fiber, glass wool, rock wool, etc., which can meet the basic sound-absorbing requirements, but in actual application, their installation and use performance gradually exposes many problems, especially the defects in adhesion and durability, which have become key factors restricting their further promotion.

[0004] The surface of the sound-absorbing panels on the market is mostly the original material (such as bare fiber layer and rough base material surface), which lacks flatness and has low surface energy, resulting in the inability to directly adhere to glue, cloth, etc. Even if the glue is forced to adhere, due to the uneven surface and high porosity, problems such as unstable adhesion, glue opening, and falling off are easily caused, which frequently leads to user complaints and increases the maintenance cost after installation. Because the traditional sound-absorbing panel has no isolation layer on the surface, the glue easily penetrates into the internal structure when adhering, which not only leads to the loss of effective components in the glue layer and the decrease of adhesion strength, but also may block the porous structure of the sound-absorbing panel, destroy the original sound-absorbing path, and greatly reduce the sound-absorbing effect, affecting the stability of acoustic performance. Due to the uneven surface, the existing sound-absorbing panel needs to be additionally leveled before installation, which increases the construction steps and time cost; at the same time, its adaptability to different materials (such as metal, wood, and plastic) is poor, which makes it difficult to meet the installation requirements of diversified scenes and limits the expansion of application range. The traditional sound-absorbing panel is mostly a single-layer structure, and has no reinforcing layer on the surface, so the overall strength is low, and when stacked, it is easy to deform or separate due to uneven stress, which cannot stably realize multi-layer stacking to enhance the sound-absorbing effect, and is difficult to adapt to complex scenes with high sound-absorbing performance requirements.

[0005] In view of this, we propose a film-coated sound-absorbing panel and a manufacturing method thereof to solve the above problems. SUMMARY

[0006] The present application aims to solve the technical problems in the prior art that the same sound-absorbing panels on the market cannot be directly glued, and the glued panels are not firm and easy to open, resulting in more complaints; meanwhile, the glue is easy to penetrate, the surface is uneven, the sound-absorbing effect and durability are poor.

[0007] To achieve the above object, the present application provides the following technical scheme:

[0008] A film-coated sound-absorbing panel, comprising:

[0009] A double-layer sound-absorbing panel comprising a sound-absorbing panel A and a sound-absorbing panel B;

[0010] A film is compounded on the surface of the sound-absorbing panel A and the sound-absorbing panel B, and the film is directly compounded with the sound-absorbing panel A and the sound-absorbing panel B, respectively.

[0011] Two surface cloths are provided and located on the outer layer of the sound-absorbing panel A and the sound-absorbing panel B, respectively.

[0012] As a preferred embodiment, the film comprises a film A, a film B, a film C and a film D, the film B and the film A are compounded on the upper and lower surfaces of the sound-absorbing panel A, respectively, and the film D and the film C are compounded on the upper and lower surfaces of the sound-absorbing panel B, respectively.

[0013] As a preferred embodiment, a glue layer B is provided between the film B and the film C.

[0014] As a preferred embodiment, the surface cloth comprises a surface cloth A and a surface cloth B, the surface of the film D is bonded to the surface cloth A through a glue layer A, and the surface of the film A is bonded to the surface cloth B through a glue layer C.

[0015] As a preferred embodiment, the sound-absorbing panel A and the sound-absorbing panel B are both made of polyester fiber board.

[0016] As a preferred embodiment, the film A, the film B, the film C and the film D are selected from PET films with high surface energy to enhance adhesion.

[0017] A manufacturing method of a film-coated sound-absorbing panel, comprising the following steps:

[0018] S1, raw material preparation stage

[0019] Select the polyester fiber material sound-absorbing board A and sound-absorbing board B that meet the specifications, ensure that the surface of the board is not damaged and has no impurities, prepare film A, film B, film C and film D, all of which are PET films with high surface energy to enhance adhesion, check the surface of the film for flatness and no wrinkles, prepare surface cloth A and surface cloth B, which can be selected from various patterned fabrics or wood grain materials, and ensure that their sizes match the boards to be compounded; Prepare glue suitable for bonding film to film and bonding film to surface cloth for subsequent coating of glue layer B, glue layer A and glue layer C;

[0020] S2, sound-absorbing board A film compounding stage

[0021] Clean the upper and lower surfaces of sound-absorbing board A to remove dust, oil stains and impurities, and ensure the cleanliness of the compounding surface. Compound film A on the lower surface of sound-absorbing board A, and use hot pressing compounding process to make film A tightly adhere to sound-absorbing board A. After the film A on the lower surface of sound-absorbing board A is firmly compounded, compound film B on the upper surface of sound-absorbing board A, and use the same hot pressing compounding process parameters as film A to ensure that film B is stably combined with sound-absorbing board A.

[0022] S3, sound-absorbing board B film compounding stage

[0023] Clean the upper and lower surfaces of sound-absorbing board B in the same way as step S2. Compound film C on the lower surface of sound-absorbing board B, and use the hot pressing compounding process described above to firmly combine film C with sound-absorbing board B. Then, compound film D on the upper surface of sound-absorbing board B, and use the same hot pressing compounding process parameters to ensure that film D tightly adheres to sound-absorbing board B.

[0024] S4, sound-absorbing board A and sound-absorbing board B compounding stage

[0025] Uniformly coat glue on film B on the upper surface of sound-absorbing board A to form glue layer B. Align and adhere film C on the lower surface of sound-absorbing board B with glue layer B on the lower surface of sound-absorbing board A. Apply pressure to make them firmly bonded. Let stand for a period of time until the glue solidifies.

[0026] S5, surface cloth compounding stage

[0027] Uniformly coat glue on film D on the upper surface of sound-absorbing board B to form glue layer A. Align and bond surface cloth A with glue layer A on film D. Apply pressure to ensure that surface cloth A tightly adheres to film D. Let stand until the glue solidifies. Uniformly coat glue on film A on the lower surface of sound-absorbing board A to form glue layer C. Align and bond surface cloth B with glue layer C on film A. Apply pressure to make surface cloth B firmly combined with film A. Let stand until the glue completely solidifies.

[0028] S6, finished product inspection and finishing stage

[0029] The overall inspection is carried out on the completed composite film-covered sound-absorbing plate, the composite between the layers is checked, and whether there is opening, bubble and other phenomena is checked, the edge of the plate is trimmed, the size meets the specified requirements, and the final film-covered sound-absorbing plate product is obtained.

[0030] As preferred, in the sound-absorbing plate A film-combining stage, a high-pressure ion air gun with a wind pressure of 0.4-0.6 MPa and a dust-free cloth are combined for cleaning to remove dust, oil stains and impurities on the upper and lower surfaces of the sound-absorbing plate A, a full-automatic hot-pressing combining machine with a model of YXRZ-1220 is used to combine the film A on the lower surface of the sound-absorbing plate A, and the hot-pressing parameters are as follows: temperature 120±2℃, pressure 0.5±0.05 MPa, and time 30±2 seconds; and calibration is carried out through a Tekscan5000 pressure distribution tester.

[0031] The film A is first combined on the lower surface of the sound-absorbing plate A, and after completion, the sound-absorbing plate A is cooled for 5-8 minutes, and then the film B is combined on the upper surface of the sound-absorbing plate A by using the same process parameters.

[0032] As preferred, in the sound-absorbing plate B film-combining stage, the upper and lower surfaces of the sound-absorbing plate B are cleaned by using the same cleaning method as that of the sound-absorbing plate A, a high-pressure ion air gun and a dust-free cloth are used, a full-automatic hot-pressing combining machine with a model of YXRZ-1220 is used, the hot-pressing temperature is 120±2℃, the pressure is 0.5±0.05 MPa, the time is 30±2 seconds, the film C is combined on the lower surface of the sound-absorbing plate B, and the film D is combined on the upper surface of the sound-absorbing plate B, and the sound-absorbing plate B is cooled for 5-8 minutes after each combination is completed.

[0033] As preferred, in the sound-absorbing plate A and the sound-absorbing plate B combining stage, a precision roller coater with a model of GT-1220 is used for glue coating, the roller coating speed is controlled to be 1-2 m / min, the glue layer B thickness is controlled to be 0.15-0.2 mm, a hydraulic cold press with a model of LY-2440 is used for pasting, the pressure is 1.0-1.2 MPa, and the pressure maintaining time is 8-10 minutes.

[0034] The glue curing is carried out in a constant-temperature and constant-humidity curing room, the temperature is 25±2℃, the humidity is 60±5% RH, and the curing time is 12-15 hours.

[0035] Compared with the prior art, the technical effects and advantages of the present application are as follows:

[0036] The present application uses the flatness and high surface energy characteristics of the film to make the surface of the board more uniform and smooth, improve the adhesion with glue, cloth and other materials, and realize firm bonding. At the same time, the film forms an isolation layer to prevent glue from penetrating into the sound absorption board, which not only protects the sound absorption structure, but also gives the board waterproof function. In addition, the double-layer sound absorption board structure after coating prolongs the sound wave propagation path, cooperates with the close bonding of the film and the sound absorption board, and further enhances the absorption capacity of sound waves of different frequencies, improving the overall sound absorption effect.

[0037] Compared with the existing similar products, the coated sound absorption board solves the bonding problem. The existing products cannot be directly glued or the glue is easy to open after gluing due to rough surface and low surface energy. The present application realizes stable bonding with various glues and cloths through coating, and does not need additional leveling treatment, reduces the risk of falling off after installation and the complaint rate, and significantly improves the construction convenience and reliability.

[0038] In terms of performance and durability, the existing products have problems such as glue penetration leading to sound absorption effect decline, easy to be affected by moisture and deteriorate, etc. The film isolation layer of the present application prevents glue penetration, maintains the integrity of the sound absorption structure, and has waterproof function, prolonging the service life. In addition, the smooth surface and symmetrical composite structure after coating make the board more easy to be stacked, which can flexibly enhance the sound absorption effect and adapt to more scenes. The existing products are easy to deform due to uneven stress when stacked, and the applicability is limited. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The figure is a structural schematic diagram of the present application.

[0040] In the figure: 1, sound absorption board A; 2, sound absorption board B; 3, film A; 4, film B; 5, film C; 6, film D; 7, glue layer B; 8, surface cloth A; 9, surface cloth B; 10, glue layer A; 11, glue layer C. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] The following will be combined Figure 1 The present application will be further described in detail,

[0043] The embodiment of the application discloses a film-coated sound-absorbing plate, which comprises a double-layer sound-absorbing plate, a film and a surface cloth, wherein the double-layer sound-absorbing plate is directly compounded with the film; the double-layer sound-absorbing plate comprises a sound-absorbing plate A1 and a sound-absorbing plate B2; the film comprises a film A3, a film B4, a film C5 and a film D6; the surface cloth comprises a surface cloth A8 and a surface cloth B9; the surface cloth A8 and the surface cloth B9 are respectively located on the outer layer of the sound-absorbing plate A1 and the sound-absorbing plate B2; and the sound-absorbing plate A1 and the sound-absorbing plate B2 are both made of polyester fiber plate. The film A3, the film B4, the film C5 and the film D6 are selected from PET films with high surface energy and enhanced adhesion.

[0044] The polyester fiber plate is used as the sound-absorbing plate A1 and the sound-absorbing plate B2, the polyester fiber has good sound-absorbing performance, can effectively absorb and attenuate sound waves and reduce noise, has good environmental protection performance, is non-toxic and odorless, does not cause harm to human body and environment and meets the modern green environmental protection requirements. In addition, the polyester fiber plate is light in texture, is convenient to process and install, can reduce the weight of the whole plate and reduce the transportation and construction costs.

[0045] The film A3, the film B4, the film C5 and the film D6 are selected from PET films with high surface energy and enhanced adhesion, the PET film has excellent physical properties such as high strength and high toughness, can effectively protect the internal sound-absorbing plate and prevent the sound-absorbing plate from being damaged, abraded or deformed due to external force. The high surface energy makes the adhesion of the sound-absorbing plate and the surface cloth more firm, ensures the stability of the composite structure. Meanwhile, the PET film has good chemical stability, is resistant to acid and alkali and aging, and can prolong the service life of the plate.

[0046] The surface cloth A8 and the surface cloth B9 can be selected from flame-retardant pattern cloth or wood grain PVC material, the flame-retardant performance meets the relevant standards, improves the safety of the plate in use and is suitable for places with fireproof requirements such as public places and interior decoration of buildings. The pattern cloth or wood grain PVC material can also endow the plate with an attractive appearance, meet different decoration requirements and improve the decoration effect.

[0047] The film B4 and the film A3 are respectively compounded on the upper and lower surfaces of the sound-absorbing plate A1, the film D6 and the film C5 are respectively compounded on the upper and lower surfaces of the sound-absorbing plate B2, a glue layer B7 is arranged between the film B4 and the film C5, the surface of the film D6 is adhered to the surface cloth A8 through a glue layer A10 and the surface of the film A3 is adhered to the surface cloth B9 through a glue layer C11.

[0048] The double-layer sound-absorbing panel is directly compounded with the film, and the film plays a role of isolation and protection. On the one hand, the film prevents the sound-absorbing panel from directly contacting the outside world, reduces the influence of dust, moisture and the like on the sound-absorbing panel, and maintains the stability of the sound-absorbing performance of the sound-absorbing panel. On the other hand, the film is closely attached to the sound-absorbing panel, and the overall strength and rigidity of the panel can be enhanced to a certain extent. At the same time, the double-layer sound-absorbing panel structure increases the sound-absorbing path and sound-absorbing area, further improves the sound-absorbing effect, and can more effectively absorb sound of different frequencies and expand the sound-absorbing frequency band.

[0049] The film B4 and the film A3 are respectively compounded on the upper and lower surfaces of the sound-absorbing panel A1, and the film D6 and the film C5 are respectively compounded on the upper and lower surfaces of the sound-absorbing panel B2. This symmetrical compounding mode makes the panel bear force uniformly, and is not prone to warping, deformation and the like due to uneven force in the production, transportation and use processes. The glue layer B7 is arranged between the film B4 and the film C5, and the sound-absorbing panel A1 and the sound-absorbing panel B2 are firmly connected together through the bonding effect of the glue, so that the integrity and stability of the double-layer structure are enhanced, and it is ensured that the panel will not be easily separated in the long-term use process.

[0050] The surface cloth A8 and B are bonded with the film D6 and A through the glue layers A10 and C respectively. This design not only enables the surface cloth to be firmly attached to the surface of the panel, but also further protects the internal film and sound-absorbing panel. The existence of the glue layer fills the small gap between the surface cloth and the film, forms a continuous interface, improves the sealing property of the panel, and reduces the influence of external factors on the internal structure. Moreover, the surface cloth can be replaced or customized according to actual needs, so that the panel can be conveniently renovated and designed individually.

[0051] A manufacturing method of a film-coated sound-absorbing panel, including the following embodiments.

[0052] Embodiment 1

[0053] The polyester fiber material sound-absorbing panel A1 and the sound-absorbing panel B2 are selected, the density is 80 kg / m 3 , the thickness tolerance is +0.2 mm, the size is 2440 mm x 1220 mm, and the size meets the GB / T20247-2018 standard for measuring the sound-absorbing performance of acoustic sound-absorbing materials. The PET film with high surface energy for enhancing the adhesion force has a surface tension of 52 mN / m, a thickness of 0.15 mm, a light transmittance of 92%, a width of 1220 mm, and a length customized according to production needs. The film thickness is spot-checked using a German FISCHER XDL-750 high-precision thickness gauge, and the thickness of 5 samples meets the standard. The surface cloth A8 and the surface cloth B9 are selected to have a grammage of 180 g / m 2The fire-retardant pattern cloth has a size of 2440 mm x 1220 mm, and the fire-retardant performance meets the B1 level standard of GB8624-2012 "Classification of Building Materials and Products Based on Combustion Performance". The two-component polyurethane adhesive has a mixing ratio of 3:1 between the main agent and the B component curing agent, a solid content of 66%, and a viscosity (25°C) of 850 mPa-s. The viscosity of the adhesive is detected three times by using a Brookfield DV2T rotary viscometer, and all meet the requirements.

[0054] The upper and lower surfaces of the sound-absorbing panel A1 are cleaned by using a high-pressure ion air gun with a wind pressure of 0.4 MPa and a dust-free cloth, and the cleanliness of the cleaned surface reaches the Class 8 level of ISO14644-1 standard. The film A3 is compounded on the lower surface of the sound-absorbing panel A1 by using a YXRZ-1220 type full-automatic hot-pressing compound machine, the hot-pressing temperature is 118°C, the pressure is 0.45 MPa, the time is 28 seconds, and the pressure uniformity error is within ±3% by calibrating the pressure uniformity by using a Tekscan5000 pressure distribution tester. After completion, it is cooled for 5 minutes, the cooling temperature is 38°C, and then the film B4 is compounded on the upper surface of the sound-absorbing panel A1 with the same parameters. The same cleaning method is used for the sound-absorbing panel A1, and the YXRZ-1220 type full-automatic hot-pressing compound machine is used, the hot-pressing temperature is 118°C, the pressure is 0.45 MPa, the time is 28 seconds, the film C5 is compounded on the lower surface of the sound-absorbing panel B2, and the film D6 is compounded on the upper surface of the sound-absorbing panel B2, and each time the compounding is completed, it is cooled for 5 minutes; the glue is coated by using a GT-1220 type precision roller coater, the roller coating speed is 1 m / min, the thickness of the glue layer B7 is 0.15 mm, and the thickness of 10 points detected by using a micrometer all meet the requirements. The compounding is performed by using a LY-2440 type hydraulic cold press, the pressure applied is 1.0 MPa, and the pressure maintaining time is 8 minutes. The glue is cured in a constant temperature and humidity curing room at a temperature of 25°C and a humidity of 60% RH for 12 hours, and the real-time monitoring and recording are performed by using a Testo175-H2 temperature and humidity recorder. The GT-1220 type precision roller coater is continuously used, the thicknesses of the glue layer A10 and the glue layer C11 are both 0.15 mm, and the roller coating speed is 1 m / min. The LY-2440 type hydraulic cold press is used, the pressure applied is 1.0 MPa, and the pressure maintaining time is 8 minutes. The curing is performed in a constant temperature and humidity curing room at a temperature of 25°C and a humidity of 60% RH for 12 hours, and after the curing is completed, it is cooled for 24 hours to eliminate internal stress.

[0055] The surface defect detection of the finished product is performed by using a Keyence VR-3000 series optical detector, and the detection accuracy reaches 0.01 mm; the interlayer peeling strength of the compound is tested by using a WDW-100 electronic universal testing machine, and the peeling strength is 5.2 N / cm. The edge of the plate is trimmed by using an MJ6128B numerical control panel saw, the size tolerance is controlled within ±0.5 mm, and the cutting surface roughness Ra is 3.0 μm.

[0056] Example 2

[0057] Polyester fiber sound-absorbing panels A1 and B2, with a density of 90 kg / m 3 The thickness tolerance is -0.1mm, the size is 2440mm×1220mm, and it meets the relevant standards; the surface tension of the ET film is 53mN / m, the thickness is 0.18mm, the transmittance is 93%, and the width is 1220mm. The film was randomly inspected using a high-precision thickness gauge, and all 5 sheets passed. The surface fabric A8 and surface fabric B9 are selected with a grammage of 200g / m 2 Wood-grain PVC material, matching dimensions, flame retardant performance meets B1 standard; two-component polyurethane adhesive, main agent and curing agent mixing ratio 3:1, solid content 67%, viscosity (25 ℃) is 1000mPa·s, passed the rotation viscometer test 3 times. Use a high-pressure ion air gun with a wind pressure of 0.5MPa and a dust-free cloth to clean the sound-absorbing panel A1, and the cleanliness meets the standard. YXRZ-1220 hot pressing laminating machine laminates film A3 to the lower surface of the sound-absorbing panel A1, hot pressing temperature 120℃, pressure 0.5MPa, time 30 seconds, and good pressure uniformity after calibration. Let it stand and cool for 6 minutes, cool to 39℃, and then laminate film B4. Similarly clean the sound-absorbing panel B2, use the same equipment and hot pressing parameters, and laminate film C5 and film D6 in turn, and let it stand and cool for 6 minutes after each lamination. The glue was applied using a GT-1220 roller coater at a speed of 1.5 m / min, with the thickness of glue layer B7 reaching 0.18 mm, and passed random inspection. The glue was laminated using a LY-2440 cold press at a pressure of 1.1 MPa and a holding time of 9 minutes. The glue was cured for 13 hours in a curing room at a temperature of 25°C and a humidity of 62% RH. The glue was applied using a roller coater at a speed of 1.5 m / min, with the thickness of glue layers A10 and C reaching 0.18 mm. The glue was laminated using a cold press at a pressure of 1.1 MPa and a holding time of 9 minutes. After curing for 13 hours in the same curing room, the glue was allowed to stand for 24 hours. The surface was inspected using an optical detector, and the peel strength tested using an electronic universal testing machine was 5.5 N / cm. The edges were trimmed using a CNC panel saw, and both size and roughness met the requirements.

[0058] Example 3

[0059] Original polyester fiber sound-absorbing panels A1 and B2, with a density of 100 kg / m 3 , thickness tolerance is +0.3mm, size 2440mm×1220mm, in line with the standard. PET film surface tension 55mN / m, thickness 0.2mm, transmittance 95%, width 1220mm, thickness gauge inspection qualified. Surface fabric A8 and surface fabric B9 use gram weight 220g / m 2 The flame-retardant patterned fabric is sized appropriately and meets the flame retardancy standards. The two-component polyurethane adhesive has a mixing ratio of 3:1, a solids content of 68%, and a viscosity of 1200 mPa·s (25°C), which has been tested and meets the standards.

[0060] Clean the sound-absorbing plate A1 with a high-pressure ion air gun at a wind pressure of 0.6 MPa and a dust-free cloth to meet the cleanliness requirement. Use a YXRZ-1220 type hot-pressing compound machine to compound the film A3 on the lower surface of the sound-absorbing plate A1, the hot-pressing temperature is 122 ℃, the pressure is 0.55 MPa, the time is 32 seconds, and the pressure uniformity is calibrated. Stand for cooling for 8 minutes, cool to 40 ℃, and then compound the film B4. Clean the sound-absorbing plate B2 in the same way, use the same equipment and parameters, and compound the film C5 and the film D6 in turn, and stand for cooling for 8 minutes each time. Use a GT-1220 type roller coater to apply glue, the roller coating speed is 2 m / min, the glue layer B7 is 0.2 mm thick, and the sample is qualified after sampling inspection. Use a LY-2440 type cold press to adhere, the pressure is 1.2 MPa, and the pressure holding time is 10 minutes. The glue is cured in a curing room at a temperature of 25 ℃ and a humidity of 65% RH for 15 hours.

[0061] Use a roller coater to apply glue, the glue layers A10 and C are 0.2 mm thick, and the roller coating speed is 2 m / min. Use a cold press to adhere, the pressure is 1.2 MPa, and the pressure holding time is 10 minutes. Stand for 24 hours after curing in a curing room for 15 hours. Use an optical detector to detect, and the electronic universal testing machine tests that the peeling strength is 5.8 N / cm. Trim the edges with a numerical control panel saw, and all indicators meet the specified requirements.

[0062] The film with high surface energy characteristics (such as PET film for enhancing adhesion) is compounded on the surface of the sound-absorbing plate, so that a uniform and smooth medium layer is formed on the surface of the plate. The high surface energy characteristics of the film can significantly improve the adhesion of the sound-absorbing plate and the printing pigment, solving the problem of poor adhesion of the pigment on the traditional sound-absorbing plate due to the rough surface and high porosity. At the same time, the flatness and sealing property of the film effectively block the penetration path of the printing pigment into the sound-absorbing plate. Compared with the existing technology, which requires 5 times of white printing to avoid ink penetration and 1 time of color printing, the present application can directly reduce the number of priming times and greatly shorten the overall time of printing color patterns on the surface, and because the pigment no longer penetrates and loses, the consumption of printing pigment is significantly reduced. In addition, the smooth surface of the film ensures uniform distribution of the pigment, reduces local color difference caused by uneven surface, and makes the color pattern on the sound-absorbing plate more saturated, detailed and bright, improving the production efficiency and optimizing the decoration effect of the product.

[0063] The present application realizes firm bonding with glue and surface cloth by direct compounding of double-layer polyester fiber sound-absorbing board and high-surface-energy PET film, using the flatness and adhesion characteristics of the film, and the film forms an isolation layer to prevent glue penetration. The symmetrical film structure makes the board stress uniform, the double-layer sound-absorbing board design prolongs the sound wave propagation path, and the close-fitting structure of each layer enhances the absorption capacity of sound waves of different frequencies, and the surface cloth further improves the protection and decoration. Its production is through processes such as hot-pressing compounding, glue coating and curing, to ensure stable combination of each layer and overall performance.

[0064] Compared with the prior art, the board solves the problems of traditional sound-absorbing board with loose glue and easy glue opening, and the surface energy after film coating is improved and the flatness is optimized, so that the bonding is more firm and no additional leveling is needed, reducing installation complaints and maintenance costs; at the same time, the film isolation layer avoids glue penetration and damage to the sound-absorbing structure, enhances waterproofness and weather resistance, prolongs service life, and the double-layer structure also widens the sound-absorbing frequency range and improves the sound-absorbing effect. In addition, the surface cloth can be customized and replaced, taking into account functionality and decoration, and is more widely applicable to scenarios, and the standardization of production processes also ensures product stability and consistency.

[0065] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A film-coated sound-absorbing board, characterized in that: include: A double-layer sound-absorbing panel, comprising a sound-absorbing panel A (1) and a sound-absorbing panel B (2); A film is compounded on the surface of the sound absorbing board A (1) and the sound absorbing board B (2), and the film is directly compounded with the sound absorbing board A (1) and the sound absorbing board B (2) respectively; The surface cloth is provided with two layers and is respectively located on the outer layers of the sound absorbing board A (1) and the sound absorbing board B (2).

2. The film-coated sound-absorbing board according to claim 1, characterized in that: The films include film A (3), film B (4), film C (5) and film D (6), wherein film B (4) and film A (3) are respectively compounded on the upper and lower surfaces of the sound absorbing board A (1), and film D (6) and film C (5) are respectively compounded on the upper and lower surfaces of the sound absorbing board B (2).

3. The film-coated sound-absorbing board according to claim 2, characterized in that: A glue layer B (7) is provided between the film B (4) and the film C (5).

4. The film-coated sound-absorbing board according to claim 2, characterized in that: The surface cloth includes a surface cloth A (8) and a surface cloth B (9), the surface of the film D (6) is bonded to the surface cloth A (8) through a glue layer A (10), and the surface of the film A (3) is bonded to the surface cloth B (9) through a glue layer C (11).

5. The film-coated sound-absorbing board according to claim 1, characterized in that: The sound absorbing panel A (1) and the sound absorbing panel B (2) are both made of polyester fiberboard.

6. The film-coated sound-absorbing board according to claim 2, characterized in that: Film A (3), film B (4), film C (5) and film D (6) are made of PET films.

7. A method for manufacturing the film-coated sound-absorbing board according to any one of claims 1 to 6, characterized in that: The steps include: S1. Raw material preparation stage Select polyester fiber sound-absorbing panels A (1) and B (2) that meet the specifications, ensure that the surface of the panels is free of damage and impurities, prepare films A (3), B (4), C (5) and D (6), all of which are PET films with high surface energy to enhance adhesion, check that the surface of the films is flat and wrinkle-free, prepare surface cloth A (8) and surface cloth B (9), and various patterned cloths or wood grain materials can be selected, ensuring that their sizes match the panels to be composited; Prepare glue suitable for bonding films to each other and for bonding films to surface cloth, for subsequent coating of glue layer B (7), glue layer A (10) and glue layer C (11); S2, Sound-absorbing panel A (1) composite film stage Clean the upper and lower surfaces of the sound-absorbing board A (1) to remove dust, oil and impurities on the surface to ensure the cleanliness of the composite surface, composite the film A (3) on the lower surface of the sound-absorbing board A (1), and use a hot pressing composite process to make the film A (3) and the sound-absorbing board A (1) fit tightly together. After the film A (3) on the lower surface of the sound-absorbing board A (1) is firmly composited, composite the film B (4) on the upper surface of the sound-absorbing board A (1), and use the same hot pressing composite process parameters as the film A (3) to ensure that the film B (4) and the sound-absorbing board A (1) are stably combined. S3, Sound-absorbing panel B (2) composite film stage The upper and lower surfaces of the sound absorbing board B (2) are cleaned in the same manner as in step S2, and the film C (5) is laminated to the lower surface of the sound absorbing board B (2), and the above-mentioned hot pressing lamination process is used to firmly bond the film C (5) to the sound absorbing board B (2). Then, the film D (6) is laminated to the upper surface of the sound absorbing board B (2), and the same hot pressing lamination process parameters are used to ensure that the film D (6) and the sound absorbing board B (2) are tightly attached. S4, the composite stage of sound-absorbing panel A (1) and sound-absorbing panel B (2) Apply glue evenly on the film B (4) on the upper surface of the sound absorbing board A (1) to form a glue layer B (7), align the film C (5) on the lower surface of the sound absorbing board B (2) with the glue layer B (7) on the film B (4) on the lower surface of the sound absorbing board A (1), apply pressure to firmly bond the two, and leave them for a period of time to allow the glue to solidify; S5, surface cloth composite stage Apply glue evenly on the film D (6) on the upper surface of the sound-absorbing board B (2) to form a glue layer A (10), align and bond the surface cloth A (8) with the glue layer A (10) on the film D (6), apply pressure to ensure that the surface cloth A (8) and the film D (6) are tightly attached, and wait for the glue to solidify; apply glue evenly on the film A (3) on the lower surface of the sound-absorbing board A (1) to form a glue layer C (11), align and bond the surface cloth B (9) with the glue layer C (11) on the film A (3), apply pressure to ensure that the surface cloth B (9) and the film A (3) are firmly bonded, and leave it until the glue is completely solidified; S6, finished product inspection and finishing stage Conduct an overall inspection on the completed laminated sound-absorbing panels to check whether the composite between the layers is firm, whether there is any debonding or air bubbles, trim the edges of the panels to make their dimensions meet the specified requirements, and obtain the final finished film-laminated sound-absorbing panels.

8. The method for manufacturing a film-coated sound-absorbing board according to claim 7, characterized in that: During the film lamination stage of the sound absorbing board A(1), a high-pressure ion air gun with a wind pressure of 0.4-0.6 MPa and a dust-free cloth were used to clean and remove dust, oil and impurities on the upper and lower surfaces of the sound absorbing board A(1). The film A(3) was laminated to the lower surface of the sound absorbing board A(1) using a fully automatic hot pressing laminating machine of model YXRZ-1220. The hot pressing parameters were: temperature 120±2°C, pressure 0.5±0.05 MPa, time 30±2 seconds. The calibration was performed using a Tekscan5000 pressure distribution tester. First, film A (3) is laminated to the lower surface of the sound absorbing board A (1), and then allowed to cool for 5 to 8 minutes. Then, film B (4) is laminated to the upper surface of the sound absorbing board A (1) using the same process parameters.

9. The method for manufacturing a film-coated sound-absorbing board according to claim 8, characterized in that: During the film lamination stage of the sound-absorbing panel B(2), the cleaning method is the same as that of the sound-absorbing panel A(1). A high-pressure ion air gun and a dust-free cloth are used to clean the upper and lower surfaces of the sound-absorbing panel B(2). The YXRZ-1220 fully automatic hot pressing laminating machine is used. The hot pressing temperature is 120±2℃, the pressure is 0.5±0.05MPa, and the time is 30±2 seconds. The film C(5) is laminated to the lower surface of the sound-absorbing panel B(2), and the film D(6) is laminated to the upper surface of the sound-absorbing panel B(2). After each lamination, the lamination is allowed to cool for 5 to 8 minutes.

10. The method for manufacturing a film-coated sound-absorbing board according to claim 7, characterized in that: During the composite stage of the sound-absorbing panel A (1) and the sound-absorbing panel B (2), a GT-1220 precision roller coating machine is used for glue coating, with the roller coating speed controlled at 1-2 m / min and the thickness of the glue layer B (7) controlled at 0.15-0.2 mm. A LY-2440 hydraulic cold press is used for lamination, with a pressure of 1.0-1.2 MPa and a holding time of 8-10 minutes. The glue is cured in a constant temperature and humidity curing room with a temperature of 25±2°C and a humidity of 60±5% RH, and the curing time is 12 to 15 hours.

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