Sound insulation pad, sound insulation pad preparation method and vehicle

Abstract

The invention discloses a sound insulation pad, a sound insulation pad preparation method and a vehicle. The sound insulation pad comprises a sound absorption cotton layer; the at least one sound insulation layer is located on at least one side of the sound absorption cotton layer in the thickness direction of the sound absorption cotton layer; the at least one sound insulation layer is bonded with the sound absorption cotton layer through the at least one hot melting film layer, and the melting temperature of the hot melting film layer is lower than the melting temperature of the sound absorption cotton layer and lower than the melting temperature of the sound insulation layer. In the embodiment of the invention, the sound-absorbing cotton layer plays a sound-absorbing role, the sound-insulating layer plays a sound-insulating role, sound-absorbing and sound-insulating effects are simultaneously achieved, and the sound-absorbing and sound-insulating effects are relatively good; the sound absorption cotton layer and the sound insulation layer are bonded together through the hot melting film layer, the sound absorption cotton structure cannot be damaged, and the bonding effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound insulation mats, in particular to a sound insulation mat, a sound insulation mat preparation method and a vehicle. BACKGROUND

[0002] The luggage compartment sound insulation mat is a component installed in the luggage compartment of an automobile. The luggage compartment sound insulation mat is usually arranged in contact with the metal panel. The luggage compartment sound insulation mat is used to absorb the noise of the luggage compartment, such as road noise, wind noise, tire noise, etc., thereby providing a good quiet effect in the vehicle and preventing the noise of the luggage compartment from being transmitted to the passenger compartment.

[0003] At present, the materials used in the luggage compartment sound insulation mat are usually PU (polyurethane) foam, double-density felt, single-layer PET (polyethylene terephthalate) felt, etc. The existing luggage compartment sound insulation mat has poor sound absorption and insulation effect and is relatively heavy. SUMMARY

[0004] The present application provides a sound insulation mat, a sound insulation mat preparation method and a vehicle, which aims to at least solve the technical problem of poor sound absorption and insulation effect and heavy weight of the luggage compartment sound insulation mat in the prior art.

[0005] In the first aspect of the present application, a sound insulation mat is provided, comprising:

[0006] a sound-absorbing cotton layer;

[0007] at least one sound insulation layer located on at least one side of the sound-absorbing cotton layer along the thickness direction of the sound-absorbing cotton layer;

[0008] at least one hot melt film layer, the at least one sound insulation layer being bonded to the sound-absorbing cotton layer through the at least one hot melt film layer, the melting temperature of the hot melt film layer being lower than the melting temperature of the sound-absorbing cotton layer and lower than the melting temperature of the sound insulation layer.

[0009] Optionally, the at least one sound insulation layer is an ethylene-vinyl acetate copolymer sound insulation layer.

[0010] Optionally, the hot melt film layer is a polyethylene film sheet, the orthographic projection of the polyethylene film sheet on the sound-absorbing cotton layer covering the sound-absorbing cotton layer, and the orthographic projection of the polyethylene film sheet on the sound insulation layer covering the sound insulation layer.

[0011] Alternatively, the hot melt film layer comprises a plurality of polyethylene film strips, the plurality of polyethylene film strips being arranged at intervals along the length direction and / or the width direction of the sound insulation mat.

[0012] Optionally, the thickness of the hot melt film layer is less than or equal to the thickness of the sound insulation layer and less than the thickness of the sound-absorbing cotton layer.

[0013] The thickness of the hot-melt film layer is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0014] Optionally, the thickness of the soundproofing pad is greater than or equal to 1 mm and less than or equal to 30 mm.

[0015] And / or, the thickness of the soundproofing layer is greater than or equal to 1 mm and less than or equal to 5 mm, and the thickness of the sound-absorbing cotton layer is greater than or equal to 5 mm and less than or equal to 30 mm.

[0016] Optionally, the at least one soundproofing layer comprises a first soundproofing layer and a second soundproofing layer, and the first soundproofing layer and the second soundproofing layer are respectively located on both sides of the sound-absorbing cotton layer along the thickness direction of the sound-absorbing cotton layer.

[0017] The at least one hot-melt film layer comprises a first hot-melt film layer and a second hot-melt film layer, the first soundproofing layer is bonded to the sound-absorbing cotton layer through the first hot-melt film layer, and the second soundproofing layer is bonded to the sound-absorbing cotton layer through the second hot-melt film layer.

[0018] Optionally, the melting temperature of the hot-melt film layer is greater than or equal to 70 degrees Celsius and less than or equal to 90 degrees Celsius.

[0019] The melting temperature of the sound-absorbing cotton layer is greater than or equal to 150 degrees Celsius, and the melting temperature of the soundproofing layer is greater than or equal to 150 degrees Celsius.

[0020] Optionally, the grammage of the soundproofing layer is greater than or equal to 2 kg / m2 and less than or equal to 10 kg / m2.

[0021] And / or, the grammage of the sound-absorbing cotton layer is greater than or equal to 150 g / m2 and less than or equal to 800 g / m2.

[0022] Optionally, the sound-absorbing cotton layer comprises a sound-absorbing cotton main body and a sound-absorbing cotton sealing edge connected to the periphery of the sound-absorbing cotton main body.

[0023] In a second aspect of the embodiment of the present application, a soundproofing pad preparation method is also provided, comprising:

[0024] Providing a sound-absorbing cotton layer and at least one hot-melt film layer;

[0025] Preparation of at least one soundproofing layer;

[0026] Stacking the sound-absorbing cotton layer, at least one hot-melt film layer and at least one soundproofing layer, and heating to the melting temperature of the hot-melt film layer, and after the preset time is reached, cooling to obtain a soundproofing pad;

[0027] The melting temperature of the hot melt film layer is less than the melting temperature of the sound-absorbing cotton layer and less than the melting temperature of the sound insulation layer; at least one sound insulation layer in the sound insulation pad is located on at least one side of the sound-absorbing cotton layer along the thickness direction of the sound-absorbing cotton layer, and the at least one sound insulation layer is bonded to the sound-absorbing cotton layer through at least one hot melt film layer.

[0028] Optionally, the preparation of the at least one sound insulation layer comprises:

[0029] providing at least one ethylene-vinyl acetate copolymer sheet;

[0030] blow molding the at least one ethylene-vinyl acetate copolymer sheet to obtain at least one ethylene-vinyl acetate copolymer sound insulation layer.

[0031] In a third aspect of the embodiment of the present application, a vehicle is also provided, which comprises the sound insulation pad as described above, or comprises the sound insulation pad prepared by the sound insulation pad preparation method as described above.

[0032] In the embodiment of the present application, the sound-absorbing cotton layer plays a sound-absorbing role, the sound insulation layer plays a sound-insulating role, and the sound-absorbing and sound-insulating effects are good, so that a better silent effect can be achieved. The sound-absorbing cotton layer adopts sound-absorbing cotton, and the sound-absorbing cotton has a relatively light gram weight when achieving the same sound-absorbing effect, so that the weight of the sound-absorbing cotton layer is relatively light, and thus the overall weight of the sound insulation pad is relatively light. In addition, the sound-absorbing cotton can maintain the sound-absorbing effect or even improve the sound-absorbing effect while reducing the weight. In addition, the sound-absorbing cotton layer and the sound insulation layer are bonded together by the hot melt film layer, which does not damage the structure of the sound-absorbing cotton, and the bonding effect is good, which is better than that of double-sided adhesive tape, can effectively avoid the problems of delamination and falling caused by poor bonding of double-sided adhesive tape, and can avoid the problem of easy leakage of glue caused by using glue. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below.

[0034] Fig. 1 A structural schematic diagram of a sound insulation pad provided in the embodiment of the present application;

[0035] Fig. 2 A partial sectional view schematic diagram of a sound insulation pad provided in the embodiment of the present application;

[0036] Fig. 3 A partial sectional view schematic diagram of another sound insulation pad provided in the embodiment of the present application.

[0037] Reference signs:

[0038] 1 - sound insulation pad, 11 - sound absorbing cotton layer, 12 - sound insulation layer, 121 - first sound insulation layer, 122 - second sound insulation layer, 13 - hot melt film layer, 131 - first hot melt film layer, 132 - second hot melt film layer, 14 - mounting hole. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0040] The embodiments of the present application are only used to explain the present application, and are not used to limit the scope of the present application. In the following paragraphs, the present application is described in more detail with examples referring to the drawings. It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate, clearly assist the purpose of explaining the embodiments of the present application.

[0041] At present, the materials used in the luggage sound insulation pad are usually PU foaming, double-density felt, single-layer PET felt, etc. The existing luggage sound insulation pad has poor sound absorption and insulation effect, and is relatively heavy. In order to solve the above problems, the present application provides a sound insulation pad, a sound insulation pad preparation method and a vehicle, which will be described in detail below.

[0042] In a first aspect, with reference to Figs. 1 to 3 The sound insulation pad 1 provided by the embodiments of the present application comprises: a sound absorbing cotton layer 11; at least one sound insulation layer 12 located on at least one side of the sound absorbing cotton layer 11 along the thickness direction of the sound absorbing cotton layer 11; and at least one hot melt film layer 13, the at least one sound insulation layer 12 is bonded to the sound absorbing cotton layer 11 through the at least one hot melt film layer 13, the melting temperature of the hot melt film layer 13 is lower than the melting temperature of the sound absorbing cotton layer 11, and is also lower than the melting temperature of the sound insulation layer 12.

[0043] The sound insulation pad 1 is applied in a vehicle, and can be a luggage sound insulation pad, a floor under sound insulation pad, etc. The sound insulation pad 1 is preferably a luggage sound insulation pad, which is installed in the luggage compartment of the vehicle and located between the luggage compartment carpet and the luggage compartment panel. The luggage sound insulation pad can be provided with a mounting hole 14, and the luggage panel includes a stud, and the mounting hole 14 is used for the stud to pass through. The stud is connected with a fastener after passing through the mounting hole 14, and the fastener is used to fix the luggage sound insulation pad through cooperation with the stud. The fastener can be a nut, an elastic buckle, etc. The sound absorbing cotton layer 11 has sound absorption effect, and the sound insulation layer 12 has sound insulation effect. The material of the sound absorbing cotton layer 11 is sound absorbing cotton, such as PP (polypropylene) sound absorbing cotton. The material of the sound insulation layer 12 can be ethylene-vinyl acetate copolymer (EVA). The material of the hot melt film layer 13 can be thermoplastic plastic, such as PE (polyethylene), PVC (polyvinyl chloride), etc. The material of the hot melt film layer 13 is preferably PE.

[0044] In the embodiment of the present application, the sound-absorbing cotton layer 11 plays a sound-absorbing role, the sound-insulating layer 12 plays a sound-insulating role, and the sound-absorbing and sound-insulating effects are good, so that better mute effect can be achieved. The sound-absorbing cotton layer 11 adopts sound-absorbing cotton, and the weight of the sound-absorbing cotton is lighter when achieving the same sound-absorbing effect, so that the weight of the sound-absorbing cotton layer 11 is lighter, and thus the overall weight of the sound-insulating pad 1 is lighter. In addition, the sound-absorbing cotton can maintain the sound-absorbing effect or even improve the sound-absorbing effect while reducing weight.

[0045] When achieving the same sound-absorbing effect, the weight of the sound-absorbing cotton is lighter, and compared with the double-density felt or PET felt material, the weight of the sound-absorbing cotton can be reduced by at least 50%. For a space greater than 30 mm and requiring strong sound absorption, the sound-absorbing cotton has a fluffy characteristic and can well fill the space, achieving obvious sound-absorbing effect. The sound-absorbing effect of 300 g / m 2 of sound-absorbing cotton is usually equivalent to the effect of 1500 g / m 2 of PET felt.

[0046] The sound-absorbing cotton is very soft and can achieve a very large deformation, which is beneficial to the installation operation of the sound-insulating pad 1. In addition, the sound-absorbing cotton has good compressibility, for example, the raw material 20 mm in thickness can be compressed to within 5 mm, the high compression performance of the sound-absorbing cotton can save the space in the luggage compartment, improve the space utilization, and increase the article accommodating space of the luggage compartment. In addition, the odor and VOC (Volatile Organic Compounds) emission performance of the sound-absorbing cotton is better than that of the double-density felt and PU foam, so as to provide a good odor environment in the vehicle.

[0047] The existing EVA (ethylene-vinyl acetate copolymer) and PU foam fixing is usually through the bonding effect of the foam itself. The foam is in a liquid state when injected, and becomes a fixed state after foaming. The foam can be bonded with EVA, but the bonding effect is not ideal, and the problem of delamination between the foam and EVA often occurs. The existing EVA and non-woven fabric are usually fixed by using glue, but the glue has a relatively high requirement on the thickness and gram weight of the non-woven fabric. When the gram weight is lower than 200 gsm, the glue is easy to seep to the surface of the non-woven fabric, affecting the appearance.

[0048] EVA and sound-absorbing cotton cannot be bonded by themselves. If EVA and sound-absorbing cotton are bonded by using glue, the sound-absorbing cotton is relatively fluffy, which can cause the glue to easily seep out, and the glue usually has an impact on the air quality in the vehicle. EVA and sound-absorbing cotton are usually connected by hot melting welding, however, hot melting welding needs a relatively large welding tool and robot, and has a high investment cost, and the sound-absorbing cotton structure in the welding area is damaged, thus causing loss of acoustic performance.

[0049] In the embodiment of the present application, the sound insulation layer 12 is bonded to the sound absorbing cotton layer 11 through the hot melt film layer 13. The bonding process of the sound insulation layer 12 and the sound absorbing cotton layer 11 can include: placing the sound insulation layer 12, the sound absorbing cotton layer 11 and the hot melt film layer 13 together in a forming tool, then heating the forming tool to the melting temperature of the hot melt film layer 13. After heating, the hot melt film layer 13 will melt to bond the sound absorbing cotton layer 11 and the sound insulation layer 12 together. After heating is completed, it is taken out and cooled. After cooling, the sound absorbing cotton layer 11 will restore to the fluffy degree before heating, without affecting the original thickness of the sound absorbing cotton layer 11. In the embodiment of the present application, the sound absorbing cotton layer 11 and the sound insulation layer 12 are bonded together through the hot melt film layer 13, without damaging the sound absorbing cotton structure, and the bonding effect is better than that of double-sided adhesive tape. The problems of delamination and falling caused by poor bonding of double-sided adhesive tape can be effectively avoided, and the problem of easy leakage of glue caused by using glue can also be avoided.

[0050] In an optional embodiment of the present application, at least one sound insulation layer 12 is an ethylene-vinyl acetate copolymer sound insulation layer. EVA is a thermoplastic material with good flexibility, elasticity and weather resistance. The ethylene-vinyl acetate copolymer sound insulation layer can be formed by suction forming. In this embodiment, the material used in the sound insulation pad 1 is a composite material of EVA and sound absorbing cotton. The ethylene-vinyl acetate copolymer sound insulation layer can meet the sound insulation effect under a relatively thin thickness, for example, a thickness of 2mm-3.5mm, which is beneficial to reduce the overall thickness of the sound insulation pad 1.

[0051] In an optional embodiment of the present application, the hot melt film layer 13 is a polyethylene film sheet, the orthographic projection of the polyethylene film sheet on the sound absorbing cotton layer 11 covers the sound absorbing cotton layer 11, and the orthographic projection of the polyethylene film sheet on the sound insulation layer 12 covers the sound insulation layer 12; or the hot melt film layer 13 includes a plurality of polyethylene film strips, and the plurality of polyethylene film strips are arranged in the length direction and / or the width direction of the sound insulation pad 1. In this embodiment, the polyethylene film sheet or the polyethylene film strip has no odor and does not release formaldehyde, benzene and other gases, which improves the odor and VOC emission performance of the whole vehicle. When the hot melt film layer 13 is a polyethylene film sheet, it can completely cover the sound absorbing cotton layer 11 and the sound insulation layer 12 to ensure the bonding effect of the sound absorbing cotton layer 11 and the sound insulation layer 12. In addition, the polyethylene film sheet itself has a certain sound insulation effect, which can further improve the sound insulation effect of the sound insulation pad 1.

[0052] In an optional embodiment of the present invention, the thickness of the hot-melt film layer 13 is less than or equal to the thickness of the sound insulation layer 12, and less than the thickness of the sound-absorbing cotton layer 11; the thickness of the hot-melt film layer 13 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. The thickness of the hot-melt film layer 13 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.5 mm, etc. Preferably, the thickness of the hot-melt film layer 13 is 0.1 mm. In this embodiment, the hot-melt film layer 13 has a smaller thickness and lighter weight, which helps to reduce the overall thickness and weight of the sound insulation pad 1.

[0053] In an optional embodiment of the present invention, the thickness of the sound insulation pad 1 is greater than or equal to 1 mm and less than or equal to 30 mm; and / or, the thickness of the sound insulation layer 12 is greater than or equal to 1 mm and less than or equal to 5 mm, and the thickness of the sound-absorbing cotton layer 11 is greater than or equal to 5 mm and less than or equal to 30 mm.

[0054] The thickness of the sound insulation pad 1 can be 1mm-5mm, 5mm-20mm, or 20mm-30mm, etc. The thickness of the sound insulation pad 1 can be 1mm, 4mm, 5mm, 10mm, 20mm, 30mm, etc. The thickness of the sound insulation layer 12 can be 1mm, 2mm, 3mm, 4mm, 5mm, etc. The thickness of the sound-absorbing cotton layer 11 can be 5mm, 10mm, 20mm, 25mm, 30mm, etc. For spaces of 5-20mm, sound-absorbing cotton with a raw material thickness of 30mm can be selected. The thickness of the compressed sound-absorbing cotton can reach 5-10mm, occupying less space and improving space utilization.

[0055] The trunk contains many environmental components, especially since many modules cannot be directly bonded to the sheet metal. However, existing dual-density felt or PET felt sound insulation pads can only be as thin as 5mm, which is insufficient to cover the small space between the sheet metal and the modules. This leaves the sheet metal exposed, resulting in an unsightly appearance and inadequate sound insulation against external noise transmission into the vehicle. In this embodiment, the sound insulation pad 1 can be as thin as 1mm, covering the 1mm-5mm space between the sheet metal and modules, wiring harnesses, etc., effectively increasing the sheet metal coverage and achieving better sound absorption and insulation.

[0056] In an optional embodiment of the present invention, reference is made to... Fig. 3At least one sound insulation layer 12 includes a first sound insulation layer 121 and a second sound insulation layer 122, which are respectively located on both sides of the sound-absorbing cotton layer 11 along its thickness direction. At least one hot-melt film layer 13 includes a first hot-melt film layer 131 and a second hot-melt film layer 132. The first sound insulation layer 121 is bonded to the sound-absorbing cotton layer 11 through the first hot-melt film layer 131, and the second sound insulation layer 122 is bonded to the sound-absorbing cotton layer 11 through the second hot-melt film layer 132. In this embodiment, the sound insulation pad 1 includes two sound insulation layers 12, providing a double-layer sound insulation effect and further improving the sound insulation effect of the sound insulation pad 1. In addition, the two sound insulation layers 12 are respectively located on both sides of the sound-absorbing cotton layer 11 along its thickness direction to better protect the sound-absorbing cotton layer 11.

[0057] In an optional embodiment of the present invention, reference is made to... Fig. 2 The sound insulation pad 1 includes a sound insulation layer 12, a hot-melt film layer 13, and a sound-absorbing cotton layer 11, which are stacked sequentially, with the sound insulation layer 12 located on top of the sound-absorbing cotton layer 11. In this embodiment, the sound insulation pad 1 includes a single sound insulation layer 12, which helps to reduce the thickness of the sound insulation pad 1 while ensuring the sound insulation effect.

[0058] In an optional embodiment of the present invention, the melting temperature of the hot-melt film layer 13 is greater than or equal to 70 degrees Celsius and less than or equal to 90 degrees Celsius; the melting temperature of the sound-absorbing cotton layer 11 is greater than or equal to 150 degrees Celsius; and the melting temperature of the sound-insulating layer 12 is greater than or equal to 150 degrees Celsius. The melting temperature of the hot-melt film layer 13 can be 70°C, 75°C, 80°C, 85°C, 90°C, etc. In this embodiment, the lower melting temperature of the hot-melt film layer 13 prevents thermal damage to the sound-absorbing cotton layer 11 and the sound-insulating layer 12 caused by higher melting temperatures when the hot-melt film layer 13 melts to achieve bonding between the sound-absorbing cotton layer 11 and the sound-insulating layer 12, thus minimizing damage to the sound-absorbing cotton structure.

[0059] In an optional embodiment of the present invention, the basis weight of the sound insulation layer 12 is greater than or equal to 2 kg / m² and less than or equal to 10 kg / m²; and / or, the basis weight of the sound-absorbing cotton layer 11 is greater than or equal to 150 g / m² and less than or equal to 800 g / m². The basis weight of the sound insulation layer 12 can be 2 kg / m². 2 3kg / m 2 5kg / m 2 6kg / m 2 10kg / m 2 The weight of the sound-absorbing cotton layer 11 can be 150 g / m². 2 200g / m 2 300g / m 2 350g / m 2 600g / m2 800g / m 2 In this embodiment, when the basis weight of the sound-absorbing cotton layer 11 is within the above-mentioned range, the basis weight of the sound-absorbing cotton layer 11 is relatively small, thereby making the weight of the sound-absorbing cotton layer 11 lighter, and consequently making the overall weight of the sound insulation pad 1 lighter. When the basis weight of the sound insulation layer 12 is within the above-mentioned range, the sound insulation effect can be guaranteed, while avoiding the sound insulation pad 1 from being too heavy.

[0060] In an optional embodiment of the present invention, the sound-absorbing cotton layer 11 includes a sound-absorbing cotton body and a sound-absorbing cotton edge banding connected to the periphery of the sound-absorbing cotton body. The edge banding of the sound-absorbing cotton layer 11 can be performed using a heat sealing method. In the heat sealing method, the edge of the sound-absorbing cotton layer 11 is heated by a heat source and then pressure is applied to complete the sealing. In this embodiment, the sound-absorbing cotton edge banding optimizes the appearance of the sound-absorbing cotton layer 11, enhancing the refinement and premium feel of the interior materials.

[0061] Secondly, embodiments of the present invention provide a method for preparing a sound insulation pad, comprising:

[0062] S1, provides a sound-absorbing cotton layer and at least one hot-melt film layer;

[0063] S2, Prepare at least one sound insulation layer;

[0064] S3, the sound-absorbing cotton layer, at least one hot melt film layer and at least one sound insulation layer are stacked, and heated to the melting temperature of the hot melt film layer. After the heating time reaches the preset time, the layer is cooled to obtain the sound insulation pad.

[0065] The melting temperature of the hot melt film layer 13 is lower than that of the sound-absorbing cotton layer 11 and also lower than that of the sound insulation layer 12. At least one sound insulation layer 12 in the sound insulation pad 1 is located on at least one side of the sound-absorbing cotton layer 11 along the thickness direction of the sound-absorbing cotton layer 11, and at least one sound insulation layer 12 is bonded to the sound-absorbing cotton layer 11 through at least one hot melt film layer 13.

[0066] The melting temperature of the hot-melt film layer 13 can be 80°C. After the sound-absorbing cotton layer, at least one hot-melt film layer, and at least one sound-insulating layer are stacked, at least one sound-insulating layer 12 is located on at least one side of the sound-absorbing cotton layer 11 along its thickness direction, and the hot-melt film layer 13 is located between the sound-absorbing cotton layer 11 and the sound-insulating layer 12. The stacked sound-absorbing cotton layer 11, at least one hot-melt film layer 13, and at least one sound-insulating layer 12 can be placed together in a molding fixture, and then the molding fixture is heated to 80°C. After heating, the hot-melt film layer 13 will melt and bond the sound-absorbing cotton layer 11 and the sound-insulating layer 12 together. After heating is complete, the layer is removed and cooled. The preset time can be set according to actual needs, and this embodiment does not limit it.

[0067] In an optional embodiment of the present invention, step S2, preparing at least one sound insulation layer, includes: providing at least one ethylene-vinyl acetate copolymer sheet; and performing vacuum forming on the at least one ethylene-vinyl acetate copolymer sheet to obtain at least one ethylene-vinyl acetate copolymer sound insulation layer. Vacuum forming is a plastic processing method in which a plastic sheet is heated to a softened state, then vacuum-formed onto a mold surface using vacuum or compressed air, and cooled to form a product of the desired shape. During vacuum forming, the forming state can be set according to actual needs. Vacuum forming can be performed using a mold to achieve different shapes and clearance structures. In this embodiment, the ethylene-vinyl acetate copolymer sound insulation layer is formed by vacuum forming, which can meet different shape design requirements to adapt to the complex environment of a suitcase.

[0068] Optionally, the hot melt film layer 13 is a polyethylene film, the orthographic projection of the polyethylene film on the sound-absorbing cotton layer 11 covers the sound-absorbing cotton layer 11, and the orthographic projection of the polyethylene film on the sound insulation layer 12 covers the sound insulation layer 12; or, the hot melt film layer 13 includes a plurality of polyethylene film strips, the plurality of polyethylene film strips being spaced apart along the length direction and / or width direction of the sound insulation pad 1.

[0069] Optionally, the thickness of the hot melt film layer 13 is less than or equal to the thickness of the sound insulation layer 12, and less than the thickness of the sound-absorbing cotton layer 11; the thickness of the hot melt film layer 13 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0070] Optionally, the thickness of the sound insulation pad 1 is greater than or equal to 1 mm and less than or equal to 30 mm; and / or, the thickness of the sound insulation layer 12 is greater than or equal to 1 mm and less than or equal to 5 mm, and the thickness of the sound-absorbing cotton layer 11 is greater than or equal to 5 mm and less than or equal to 30 mm.

[0071] Optionally, at least one sound insulation layer 12 includes a first sound insulation layer 121 and a second sound insulation layer 122, the first sound insulation layer 121 and the second sound insulation layer 122 being located on both sides of the sound-absorbing cotton layer 11 along the thickness direction of the sound-absorbing cotton layer 11; at least one hot melt film layer 13 includes a first hot melt film layer 131 and a second hot melt film layer 132, the first sound insulation layer 121 being bonded to the sound-absorbing cotton layer 11 through the first hot melt film layer 131, and the second sound insulation layer 122 being bonded to the sound-absorbing cotton layer 11 through the second hot melt film layer 132.

[0072] Optionally, the melting temperature of the hot melt film layer 13 is greater than or equal to 70 degrees Celsius and less than or equal to 90 degrees Celsius; the melting temperature of the sound-absorbing cotton layer 11 is greater than or equal to 150 degrees Celsius; and the melting temperature of the sound insulation layer 12 is greater than or equal to 150 degrees Celsius.

[0073] Optionally, the weight of the sound insulation layer 12 is greater than or equal to 2 kg per square meter and less than or equal to 10 kg per square meter; the weight of the sound-absorbing cotton layer 11 is greater than or equal to 150 g per square meter and less than or equal to 800 g per square meter.

[0074] Optionally, the sound-absorbing cotton layer 11 includes a sound-absorbing cotton body and a sound-absorbing cotton edge banding connected to the periphery of the sound-absorbing cotton body.

[0075] Thirdly, embodiments of the present invention also provide a vehicle, including the sound insulation pad provided in the first aspect, or the sound insulation pad prepared by the method for preparing the sound insulation pad provided in the second aspect. The sound insulation pad is preferably a trunk sound insulation pad, which is installed inside the vehicle's trunk and located between the trunk carpet and the trunk sheet metal.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0078] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

[0080] The above provides a detailed description of the sound insulation pad, the method for preparing the sound insulation pad, and the vehicle provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the structure and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A soundproofing mat, characterized in that, The soundproofing pad comprises: a sound-absorbing cotton layer; at least one soundproofing layer, which is located on at least one side of the sound-absorbing cotton layer along the thickness direction of the sound-absorbing cotton layer; at least one hot melt film layer, and the at least one soundproofing layer is bonded to the sound-absorbing cotton layer through the at least one hot melt film layer, the melting temperature of the hot melt film layer is less than the melting temperature of the sound-absorbing cotton layer, and is less than the melting temperature of the soundproofing layer.

2. The acoustical mat of claim 1, wherein The at least one soundproofing layer is an ethylene-vinyl acetate copolymer soundproofing layer.

3. The acoustical mat of claim 1, wherein The hot melt film layer is a polyethylene film sheet, and the orthographic projection of the polyethylene film sheet on the sound-absorbing cotton layer covers the sound-absorbing cotton layer, and the orthographic projection of the polyethylene film sheet on the soundproofing layer covers the soundproofing layer. Alternatively, the hot melt film layer comprises a plurality of polyethylene film strips, and the plurality of polyethylene film strips are arranged at intervals along the length direction and / or the width direction of the soundproofing pad.

4. The acoustical mat according to any one of claims 1 to 3, characterized in that The thickness of the hot melt film layer is less than or equal to the thickness of the soundproofing layer, and is less than the thickness of the sound-absorbing cotton layer. The thickness of the hot melt film layer is greater than or equal to 0.1 mm, and is less than or equal to 0.5 mm.

5. The acoustical mat according to any one of claims 1 to 3, characterized in that The thickness of the soundproofing pad is greater than or equal to 1 mm, and is less than or equal to 30 mm. The thickness of the soundproofing layer is greater than or equal to 1 mm, and is less than or equal to 5 mm, and the thickness of the sound-absorbing cotton layer is greater than or equal to 5 mm, and is less than or equal to 30 mm.

6. The acoustical mat according to any one of claims 1 to 3, characterized in that The at least one soundproofing layer comprises a first soundproofing layer and a second soundproofing layer, and the first soundproofing layer and the second soundproofing layer are respectively located on both sides of the sound-absorbing cotton layer along the thickness direction of the sound-absorbing cotton layer. The at least one hot melt film layer comprises a first hot melt film layer and a second hot melt film layer, the first soundproofing layer is bonded to the sound-absorbing cotton layer through the first hot melt film layer, and the second soundproofing layer is bonded to the sound-absorbing cotton layer through the second hot melt film layer.

7. The acoustical mat of any one of claims 1 to 3, wherein, The melting temperature of the hot melt film layer is greater than or equal to 70 DEG C, and is less than or equal to 90 DEG C. The melting temperature of the sound-absorbing cotton layer is greater than or equal to 150 DEG C, and the melting temperature of the soundproofing layer is greater than or equal to 150 DEG C.

8. The acoustical mat of any one of claims 1 to 3, wherein, The grammage of the soundproofing layer is greater than or equal to 2 kg / m2, and is less than or equal to 10 kg / m2. The grammage of the sound-absorbing cotton layer is greater than or equal to 150 g / m2, and is less than or equal to 800 g / m2.

9. The acoustical mat of any one of claims 1 to 3, wherein, The sound-absorbing cotton layer comprises a sound-absorbing cotton main body and a sound-absorbing cotton sealing edge connected to the periphery of the sound-absorbing cotton main body.

10. A method of making an acoustical mat, the method comprising: The soundproofing pad comprises: providing a sound-absorbing cotton layer and at least one hot melt film layer; preparing at least one soundproofing layer; stacking the sound-absorbing cotton layer, the at least one hot melt film layer and the at least one soundproofing layer, and heating to the melting temperature of the hot melt film layer, and cooling after the heating time reaches a preset time to obtain a soundproofing pad; The melting temperature of the hot melt film layer is less than the melting temperature of the sound-absorbing cotton layer, and is less than the melting temperature of the soundproofing layer; at least one soundproofing layer in the soundproofing pad is located on at least one side of the sound-absorbing cotton layer along the thickness direction of the sound-absorbing cotton layer, and the at least one soundproofing layer is bonded to the sound-absorbing cotton layer through the at least one hot melt film layer.

11. The method of claim 10, wherein the soundproofing mat is prepared by The preparation of the at least one soundproofing layer comprises: providing at least one ethylene-vinyl acetate copolymer sheet; blow molding at least one of the ethylene-vinyl acetate copolymer sheets to obtain at least one ethylene-vinyl acetate copolymer soundproof layer.

12. A vehicle characterized by comprising: The soundproofing mat according to any one of claims 1 to 9, or a soundproofing mat prepared by the method according to claim 10 or 11.

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