Automobile sound insulation pad and production method thereof

Abstract

The invention belongs to the technical field of automobile sound insulation pads, and particularly relates to an automobile sound insulation pad and a production method thereof.The automobile sound insulation pad comprises an upper felt body, a lower felt body, a supporting body and a heat preservation filling material; the upper felt body and the lower felt body are arranged side by side; the supporting body is arranged between the upper felt body and the lower felt body; the two opposite end faces of the supporting body are connected to the upper felt body and the lower felt body respectively. A filling cavity is formed among the support body, the upper felt body and the lower felt body; a filling guide hole is formed in the supporting body; one end of the filling guide hole is communicated with the filling cavity; the thermal insulation filling material is arranged in the filling cavity; and the volume of the foamed thermal insulation filling material is larger than that of the filling cavity. The heat preservation effect and the sound insulation effect can be guaranteed, and the phenomena of collapse and the like of the sound insulation pad are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile sound insulation pads, and in particular relates to an automobile sound insulation pad and a production method thereof. Background Art

[0002] Car sound insulation pads are installed in the front cockpit of the car to provide heat and sound insulation. In an era of increasing pursuit of high performance, environmental protection, energy saving, lightweight and personalization, the interior of a car, like its appearance, has become an important factor in people's car purchase. Therefore, the requirements for car interior parts are also getting higher and higher.

[0003] However, some existing sound insulation pads have the following main problems: 1. The sound absorption index does not meet the requirements; 2. The thermal insulation effect is poor or even has no thermal insulation effect. Summary of the invention

[0004] The purpose of the present invention is to provide a car sound insulation pad to solve any of the above-mentioned technical problems in view of the shortcomings of the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A car sound insulation pad comprises an upper felt body, a lower felt body, a support body and a thermal insulation filling material; the upper felt body and the lower felt body are arranged side by side; the support body is arranged between the upper felt body and the lower felt body; and two opposite end faces on the support body are respectively connected to the upper felt body and the lower felt body; a filling cavity is provided between the support body, the upper felt body and the lower felt body; a filling guide hole is provided in the support body; one end of the filling guide hole is connected to the filling cavity; the thermal insulation filling material is arranged inside the filling cavity; and the volume of the thermal insulation filling material after foaming is greater than the volume of the filling cavity.

[0006] Preferably, the volume of the thermal insulation filling material after foaming is greater than one nineteenth to one eighteenth of the volume of the filling cavity.

[0007] Preferably, the upper felt body comprises a first substrate, a first barrier film and a first adhesive which are sequentially stacked along the thickness direction; the first adhesive is connected to the support body; And / or, the lower felt body includes a second substrate and a second adhesive stacked along a thickness direction; the second adhesive is connected to the support body; and the bottom of the first adhesive and the top of the second adhesive are respectively bonded to the thermal insulation filling material.

[0008] Preferably, the upper felt body is provided with two first edge segments and at least one first convex segment and at least one first concave segment arranged between the first edge segments; the first convex segments and the first concave segments are arranged alternately; and the first convex segment is provided with a first convex block protruding toward the filling cavity; and the first concave segment is provided with a first concave groove concave toward the upper felt body; And / or, the lower felt body is provided with two second edge segments and at least one second raised segment and at least one second recessed segment arranged between the second edge segments; the second raised segments and the second recessed segments are arranged alternately; and the second raised segments are provided with a second protrusion protruding toward the filling cavity; and the second recessed segments are provided with a second groove recessed toward the lower felt body.

[0009] Preferably, the relationship between the thickness H1 of the second edge segment, the thickness H2 of the second edge segment and the thickness H3 of the support body satisfies: H3=(H1+H2)*(1 / 2-2 / 3).

[0010] Preferably, the relationship between the length L4 of each first edge segment, the length L1 of each first protrusion, the length L2 of each first groove and the length L3 of each first recessed segment at a non-first groove satisfies: L1=L4+ L3+ L2; And / or, the relationship between the length L8 of each second edge segment, the length L5 of each second protrusion, the length L6 of each second groove and the length L7 of each second recessed segment at a non-second groove satisfies: L8=L5+ L6+ L7.

[0011] The present invention also discloses a method for producing a car sound insulation pad, which is used to produce the car sound insulation pad; wherein the method for producing the car sound insulation pad comprises the following steps: S1, subjecting the raw materials to hot pressing, shaping, adhesion and gluing treatments to form an upper felt body and a lower felt body; S2, hoisting the upper felt body and the lower felt body to a filling device; and placing a support body between the upper felt body and the lower felt body for reinforcement; S3, using a filling device to fill the thermal insulation filling material into the support body, the upper felt body and the lower felt body to form a preliminary body of the sound insulation pad; S4, heating and molding the preliminary body of the sound insulation pad and cooling and discharging the material to form a finished body of the sound insulation pad.

[0012] Preferably, the step of subjecting the raw materials to hot pressing, shaping, adhesion and gluing with a jig to form the upper felt body and the lower felt body comprises the following: S11, subjecting the raw materials to a hot pressing and shaping process using a jig to form a first substrate and a second substrate; S12, performing a barrier material bonding process on the first substrate, so that the first intermediate product of the first barrier film is adhered to the first substrate; S13, performing glue coating treatment on the first intermediate product and the second substrate respectively to form an upper felt body and a lower felt body.

[0013] Preferably, the step of lifting the upper felt body and the lower felt body onto a filling device; and placing a support body between the upper felt body and the lower felt body for reinforcement treatment comprises the following: Transferring the lower felt body to a workbench of a filling device; Transferring the two support bodies to the upper surface of the lower felt body on the workbench; transferring the upper felt body to the upper surface of the support body; Driving the upper pressing plate to move to the upper surface of the upper felt body to achieve the compression bonding of the upper felt body, the support body and the lower felt body into one; The front and rear ends of the whole formed by the upper felt body, the support body and the lower felt body are sealed and blocked.

[0014] Preferably, in the steps of heating and molding the initial body of the sound insulation pad and cooling and discharging the initial body, The heating molding temperature is 150-180°C, the cooling temperature is 13-18°C, and the cooling time is 50s.

[0015] The beneficial effects of the present invention are that the technical solution can ensure that the gas in the foaming process of the thermal insulation filling material can be quickly discharged through the exhaust effect of the upper felt body or the lower felt body, so as to improve the structural compactness of the thermal insulation filling material after foaming, thereby reducing the excessive gaps or bubbles in the thermal insulation filling material; and can ensure the thermal insulation effect and sound insulation effect, and avoid the collapse of the sound insulation pad; in addition, combined with the supporting effect of the upper middle support body, it can further improve the structural stability; and improve the compactness of the structure; at the same time, ensure the thermal insulation effect and sound insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following will refer to the attached Figures 1 to 6 To describe the features, advantages and technical effects of exemplary embodiments of the present invention.

[0017] Figure 1 This is a schematic structural diagram of a car sound insulation pad according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a car sound insulation pad according to an embodiment of the present invention; Figure 3 A partial enlarged view of a car sound insulation pad according to an embodiment of the present invention; Figure 4A partial enlarged view of a car sound insulation pad according to an embodiment of the present invention; Figure 5 A flow chart of a method for producing a car sound insulation pad according to an embodiment of the present invention; Figure 6 The present invention is a flowchart of a method for producing a car sound insulation pad according to an embodiment of the present invention.

[0018] In the figure: 1-upper felt body; 11-first substrate; 12-first barrier film; 13-first adhesive; 101-first edge section; 102-first raised section; 103-first recessed section; 104-first bump; 105-first groove; 2-lower felt body; 21-second substrate; 23-second adhesive; 201-second edge section; 202-second raised section; 203-second recessed section; 204-second bump; 205-second groove; 3-support body; 4-thermal insulation filling material; 5-filling cavity. DETAILED DESCRIPTION

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0020] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0024] The following is combined with Figure 1 to Figure 6 The present invention is further described in detail, but is not intended to limit the present invention.

[0025] like Figure 1 As shown, in one embodiment of the present invention, the car sound insulation pad comprises an upper felt body 1, a lower felt body 2, a support body 3 and a thermal insulation filling material 4; the upper felt body 1 and the lower felt body 2 are stacked and arranged side by side; the number of the support bodies 3 is at least two, and they are arranged side by side between the upper felt body 1 and the lower felt body 2; and the two opposite end faces on each of the support bodies 3 are respectively connected to the upper felt body 1 and the lower felt body 2; a filling cavity 5 is provided between the support body 3, the upper felt body 1 and the lower felt body 2; a filling guide hole 31 is provided in the support body 3; one end of the filling guide hole 31 is connected to the filling cavity 5; the other end of the filling guide hole 31 is connected to the outside of the support body 3; the thermal insulation filling material 4 is arranged inside the filling cavity 5; and the volume of the thermal insulation filling material 4 after foaming is greater than the volume of the filling cavity 5 and reaches the required density of the intermediate of the car sound insulation pad.

[0026] The technical solution of the present invention can ensure that the gas in the foaming process of the thermal insulation filling material can be quickly discharged through the exhaust function of the upper felt body or the lower felt body, so as to improve the structural compactness of the thermal insulation filling material after foaming, thereby reducing the excessive gaps or bubbles in the thermal insulation filling material; and can ensure the thermal insulation effect and sound insulation effect, and avoid the collapse of the sound insulation pad; in addition, combined with the supporting function of the upper middle support body, it can further improve the structural stability; and improve the compactness of the structure; at the same time, ensure the thermal insulation effect and sound insulation effect.

[0027] Specifically, in some embodiments, the volume of the thermal insulation filling material 4 after foaming is greater than one nineteenth to one eighteenth of the volume of the filling cavity 5. That is, the bubbles generated during the filling process of the thermal insulation filling material can be effectively discharged through the filling amount within a certain range, and the expansion due to excessive amount can be avoided, thereby improving the structural stability and ensuring the processing safety.

[0028] Specifically, in some embodiments, the material of the support body 3 is the same as that of the thermal insulation filling material 4; and the material of the support body 3 is a polyurethane foam material; and the thermal insulation filling material 4 is a polyurethane foam material. The support body 3 and the thermal insulation filling material are made of the same material, so that the two can be integrated with each other during the foaming process, thereby further improving the overall structural stability and improving the thermal insulation efficiency.

[0029] Specifically, in some embodiments, Figure 1 and 2 As shown, the upper felt body 1 comprises a first substrate 11, a first barrier film 12 and a first viscose 13 which are sequentially stacked in the thickness direction; the first viscose 13 is connected to the support body 3; the lower felt body 2 comprises a second substrate 21 and a second viscose 23 which are stacked in the thickness direction; the second viscose 23 is connected to the support body 3; and the bottom of the first viscose 13 and the top of the second viscose 23 are respectively bonded to the thermal insulation filling material 4. Among them, the first viscose 13 is made of fiber materials such as modal, matte silk or artificial wool; the second viscose 23 is made of fiber materials such as modal, matte silk or artificial wool; the first barrier film 12 is made of high-density polyethylene (HDPE) or high-density polypropylene (HDPP); the first substrate 11 is made of foam or polymer material or polyurethane rubber; the second substrate 21 is made of foam or ethylene-vinyl acetate copolymer (EVA). That is to say, through the efficient sound insulation of the upper felt body and the sound insulation and exhaust function of the lower felt body, it can be ensured that the gas in the foaming process of the thermal insulation filling material can be discharged quickly, so as to improve the structural compactness of the thermal insulation filling material after foaming, thereby reducing the excessive gaps or bubbles in the thermal insulation filling material; thereby improving the structural stability; and ensuring the thermal insulation effect and sound insulation effect at the same time.

[0030] Specifically, in some embodiments, Figure 1 and 2 As shown, the upper felt body 1 is provided with two first edge segments 101 and at least one first raised segment 102 and at least one first recessed segment 103 arranged between the first edge segments 101; the first raised segments 102 and the first recessed segments 103 are arranged alternately with each other; and the first raised segment 102 is provided with a first protrusion 104 protruding toward the filling cavity 5; and the first recessed segment 103 is provided with a first groove 105 recessed toward the main body of the upper felt body 1.

[0031] Specifically, in some embodiments, Figure 1 and 2As shown, the lower felt body 2 is provided with two second edge segments 201 and at least one second raised segment 202 and at least one second recessed segment 203 arranged between the second edge segments 201; the second raised segments 202 and the second recessed segments 203 are arranged alternately; and the second raised segments 202 are provided with a second convex block 204 protruding toward the filling cavity 5; and the second recessed segment 203 is provided with a second groove 205 recessed toward the lower felt body 2; Among them, the projection of the second groove 205 toward the filling cavity 5 coincides with the projection of the first groove 105 toward the filling cavity 5; and the projection of the second raised section 202 toward the filling cavity 5 coincides with the projection of the first protrusion 104 toward the filling cavity 5; so as to improve the convenience of processing operations and help to ensure the sound insulation effect.

[0032] Specifically, in some embodiments, Figure 2 As shown, the relationship between the thickness H1 of the second edge segment 201, the thickness H2 of the second edge segment 201 and the thickness H3 of the support body 3 satisfies: H3=(H1+H2)*(1 / 2~2 / 3). In other words, it can be: H3=(H1+H2)*1 / 2; or H3=(H1+H2)*2 / 3; or H3=(H1+H2)*3.5 / 6, etc. This structure can ensure the stability of the overall structure and effectively save the thermal insulation filling material and the material of the support body 3.

[0033] Specifically, in some embodiments, Figure 2 and 3 As shown, the relationship between the length L4 of each first edge section 101, the length L1 of each first protrusion 104, the length L2 of each first groove 105, and the length L3 of each first recessed section 103 at a position other than the first groove 105 satisfies: L1 = L4 + L3 + L2. This structure can achieve an increase in the refraction amplitude of the noise transmission track and reduce the loudness through the larger first protrusion 104, and with the smaller depth and length of the first groove 105, the noise transmission track can be continuously refracted and reduced to achieve a sound insulation effect.

[0034] Specifically, in some embodiments, Figure 2 and 4As shown, the relationship between the length L8 of each second edge section 201, the length L5 of each second protrusion 204, the length L6 of each second groove 205, and the length L7 of each second recessed section 203 at a location other than the second groove 205 satisfies: L8 = L5 + L6 + L7. This structure can achieve an increase in the refraction amplitude of the noise transmission track and reduce the loudness through the larger second protrusion 204, and with the smaller depth and length of the second groove 205, the noise transmission track can be continuously refracted and reduced to achieve a sound insulation effect.

[0035] The present invention also proposes a method for producing a car sound insulation pad, which is used to make a car sound insulation pad. The specific structure of the car sound insulation pad refers to the above embodiment. Since the production method of the car sound insulation pad adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0036] Among them, Figure 5 As shown, the production method of the automobile sound insulation pad comprises the following steps: S1, subjecting the raw materials to hot pressing, shaping, adhesion and gluing treatments to form an upper felt body and a lower felt body; S2, hoisting the upper felt body and the lower felt body to a filling device; and placing a support body between the upper felt body and the lower felt body for reinforcement; S3, using a filling device to fill the thermal insulation filling material into the support body, the upper felt body and the lower felt body to form a preliminary body of the sound insulation pad; S4, heating and molding the preliminary body of the sound insulation pad and cooling and discharging the material to form a finished body of the sound insulation pad.

[0037] Specifically, in some embodiments, Figure 5 and 6 As shown, in S1, the step of subjecting the raw materials to hot pressing, shaping, adhesion and gluing with a jig to form an upper felt body and a lower felt body includes the following: S11, subjecting the raw materials to a hot pressing and shaping process with a jig to form a first substrate and a second substrate; wherein the raw materials are sent into an oven for baking and softening, the temperature of the heating zone of the oven is 200°C to 210°C, and the baking time is 225 s to 240 s; the raw materials after baking and softening are pressed and cooled to form the first substrate and the second substrate; during the pressing and cooling forming, the forming pressure is 15 to 16 MPa, the forming time is 120 to 140 s, the cooling temperature is 18 to 25°C, and the cooling time is 30 s; S12, performing a barrier material bonding process on the first substrate, so that the first intermediate product of the first barrier film is adhered to the first substrate; S13, respectively applying glue to the first intermediate product and the second substrate to form an upper felt body and a lower felt body; to form an upper felt body 1 with a first barrier film 12 and a first adhesive 13 on the first substrate 11 and a lower felt body 2 with a second adhesive 23 on the second substrate 21.

[0038] Specifically, in some embodiments, in S2, the step of lifting the upper felt body and the lower felt body to a filling device; and placing a support body between the upper felt body and the lower felt body for reinforcement treatment includes the following: Transferring the lower felt body to a workbench of a filling device; Transferring the two support bodies to the upper surface of the lower felt body on the workbench; transferring the upper felt body to the upper surface of the support body; Driving the upper pressing plate to move to the upper surface of the upper felt body to achieve the compression bonding of the upper felt body, the support body and the lower felt body into one; The front and rear ends of the whole formed by the upper felt body, the support body and the lower felt body are sealed and blocked to avoid leakage of the thermal insulation filling material during the filling process, thereby ensuring the orderliness of the processing and saving materials.

[0039] Specifically, in some embodiments, in S3, the step of using a filling device to fill the thermal insulation filling material into the support body, the upper felt body and the lower felt body includes the following: The thermal insulation filling material is poured into the filling guide hole 31 of the support body by using a filling device, so that the support body, the upper felt body and the lower felt body are filled with the thermal insulation filling material.

[0040] Specifically, in some embodiments, in the step of heating and molding the initial body of the sound insulation pad and cooling and discharging the initial body in S4, The heating molding temperature is 150-180°C, the cooling temperature is 13-18°C, and the cooling time is 50s.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0042] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A car sound insulation pad, characterized by: It includes an upper felt body, a lower felt body, a support body and a thermal insulation filling material; the upper felt body and the lower felt body are arranged side by side; the support body is arranged between the upper felt body and the lower felt body; and the two opposite end faces on the support body are respectively connected to the upper felt body and the lower felt body; a filling cavity is provided between the support body, the upper felt body and the lower felt body; a filling guide hole is provided in the support body; one end of the filling guide hole is connected to the filling cavity; the thermal insulation filling material is arranged inside the filling cavity; and the volume of the thermal insulation filling material after foaming is greater than the volume of the filling cavity.

2. The car sound insulation pad according to claim 1, characterized in that: The volume of the thermal insulation filling material after foaming is greater than one nineteenth to one eighteenth of the volume of the filling cavity.

3. The car sound insulation pad according to claim 1, characterized in that: The upper felt body comprises a first substrate, a first barrier film and a first adhesive which are sequentially stacked along the thickness direction; the first adhesive is connected to the support body; And / or, the lower felt body includes a second substrate and a second adhesive stacked along a thickness direction; the second adhesive is connected to the support body; and the bottom of the first adhesive and the top of the second adhesive are respectively bonded to the thermal insulation filling material.

4. The automobile sound insulation pad according to claim 1 or 3, characterized in that: The upper felt body is provided with two first edge sections and at least one first convex section and at least one first concave section arranged between the first edge sections; the first convex sections and the first concave sections are arranged alternately; and the first convex section is provided with a first convex block protruding toward the filling cavity; and the first concave section is provided with a first concave groove concave toward the upper felt body; And / or, the lower felt body is provided with two second edge segments and at least one second raised segment and at least one second recessed segment arranged between the second edge segments; the second raised segments and the second recessed segments are arranged alternately; and the second raised segments are provided with a second protrusion protruding toward the filling cavity; and the second recessed segments are provided with a second groove recessed toward the lower felt body.

5. The automobile sound insulation pad according to claim 4, characterized in that: The relationship between the thickness H1 of the second edge segment, the thickness H2 of the second edge segment and the thickness H3 of the support body satisfies: H3=(H1+H2)*(1 / 2-2 / 3).

6. The automobile sound insulation pad according to claim 4, characterized in that: The relationship between the length L4 of each first edge segment, the length L1 of each first protrusion, the length L2 of each first groove and the length L3 of each first recessed segment other than the first groove satisfies: L1= L4+ L3+ L2; And / or, the relationship between the length L8 of each second edge segment, the length L5 of each second protrusion, the length L6 of each second groove and the length L7 of each second recessed segment at a non-second groove satisfies: L8= L5+L6+ L7.

7. A method for producing a car sound insulation pad, characterized in that: Used to produce the automobile sound insulation pads as described in claims 1 to 6 above; wherein the production method of the automobile sound insulation pads comprises the following steps: S1, subjecting the raw materials to hot pressing, shaping, adhesion and gluing treatments to form an upper felt body and a lower felt body; S2, hoisting the upper felt body and the lower felt body to a filling device; and placing a support body between the upper felt body and the lower felt body for reinforcement; S3, using a filling device to fill the thermal insulation filling material into the support body, the upper felt body and the lower felt body to form a preliminary body of the sound insulation pad; S4, heating and molding the preliminary body of the sound insulation pad and cooling and discharging the material to form a finished body of the sound insulation pad.

8. The method for producing a car sound insulation pad according to claim 7, characterized in that: The steps of subjecting the raw materials to hot pressing, shaping, adhesion and gluing with a jig to form an upper felt body and a lower felt body include the following: S11, subjecting the raw materials to a hot pressing and shaping process using a jig to form a first substrate and a second substrate; S12, performing a barrier material bonding process on the first substrate, so that the first intermediate product of the first barrier film is adhered to the first substrate; S13, performing glue coating treatment on the first intermediate product and the second substrate respectively to form an upper felt body and a lower felt body.

9. The method for producing a car sound insulation pad according to claim 7, characterized in that: The step of lifting the upper felt body and the lower felt body to the filling device; and placing a support body between the upper felt body and the lower felt body for reinforcement treatment, comprises the following: Transferring the lower felt body to a workbench of a filling device; Transferring the two support bodies to the upper surface of the lower felt body on the workbench; transferring the upper felt body to the upper surface of the support body; Driving the upper pressing plate to move to the upper surface of the upper felt body to achieve the compression bonding of the upper felt body, the support body and the lower felt body into one; The front and rear ends of the whole formed by the upper felt body, the support body and the lower felt body are sealed and blocked.

10. The method for producing a car sound insulation pad according to claim 7, characterized in that: In the step of heating and molding the initial body of the sound insulation pad and cooling and discharging the initial body, The heating molding temperature is 150-180°C, the cooling temperature is 13-18°C, and the cooling time is 50s.

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