JPH0446909Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) This invention relates to a composite vibration-damping and sound-insulating material that is applied to vehicles, and specifically relates to a composite vibration-damping and sound-insulating material that is suitable for cold-resistant applications. (Prior Art) Conventionally, vibration damping and sound insulating materials for vehicles have been produced by, for example, layering heat-sealable damping sheets larger than the layer on both sides of a porous cushioning layer. A composite vibration-damping and sound-insulating material is known in which the overlapped sheets are joined by temporary fixing means. This composite vibration-damping and sound-insulating material is widely used because it has great vibration-damping and sound-damping effects and is easy to install. (Problems to be Solved by the Invention) However, the above-mentioned conventional composite vibration-damping and sound-insulating materials had an inconvenient problem in that the upper layer of the vibration-damping sheet cracked when a load was applied at a low temperature of, for example, -30°C. There have also been attempts to use an elastomer or rubber sheet as the upper layer, but elastomer or rubber sheets do not conform well to the ribs of the vehicle floor panel when heat-sealed, and may form a gap between them and the lower heat-sealable sheet. 〓There will be inconvenience caused by the delay. Therefore, there are cases where the edges that are not compatible are bonded with adhesive,
The bonded end faces tend to peel off because they do not fit well, and this construction using adhesives is time-consuming and increases costs, and there is a problem in that the bonded end faces that do not fit well easily peel off. Therefore, the present invention aims to provide a vibration-damping and sound-insulating material that is easy to heat-seal and bond to vehicle surfaces such as floor panels, and whose upper layer does not crack when a load is applied at low temperatures, such as -30°C. It is something. (Means for solving the problem) The means of this invention is to stack heat-sealable vibration damping sheets larger than the layer on both sides of a porous cushioning layer, and to In the composite vibration-damping and sound-insulating material in which the overlapping margins are joined by temporary fixing means, there is a layer on the upper layer vibration-damping sheet or between the upper layer vibration-damping sheet and the cushion layer, which has a high load resistance at low temperatures and It has a structure in which a protective layer having almost the same shape is provided. The cushion layer is made of felt or polyurethane, which is porous, has cushioning properties, and has high soundproofing and vibration damping properties. As the heat-sealable vibration damping sheet, a sheet made of a material made of bitumen mixed with an inorganic filler and a fibrous material, that is, a bituminous sheet used for normal vibration damping is used.
As for the temporary fixing means, fixing is carried out by partial heat fusing using hot melt, fixing pins using a stapler, or the like. The protective layer is made of a material that does not crack or break at low temperatures and has high load resistance and does not crack under load. A roofing material made of a paper sheet impregnated with asphalt, a cardboard sheet, or a soft resin board can serve as a good protective layer. The material and thickness of the protective layer are changed as appropriate in consideration of the load conditions. The protective layer is layered on top of the upper vibration damping sheet and either heat-sealed or
Alternatively, it is interposed and bonded between the upper vibration damping sheet and the cushion layer. (Function) This composite vibration-damping and sound-insulating material is placed on the surface to be adhered to inside the vehicle with the protective layer facing upward, and is heat-bonded. In the bonded composite vibration-damping and sound-insulating material, the protective layer has a high load capacity at low temperatures and acts to protect the upper layer of the vibration-damping sheet. (Example) Next, Example 1 of the present invention will be described based on FIGS. 1 to 3. FIG. 1 shows the structure of a composite vibration damping and sound insulating material 1, in which a vibration damping sheet 2 for the lower layer is placed on the bottom surface of a cushion layer 3 having cushioning properties, and a protective layer 4 is stacked on the top surface of the cushion layer 3. The damping sheet 4 for the upper layer is stacked on the protective layer 4, and the overlapping margins of the stacked damping sheets 2 and 5 are joined by temporary fixing means 6. The cushion layer 3 is made of felt having a thickness of 4 mm and a basis weight of 400 g/m ^{2 ,} for example. The vibration damping sheet 2 for the lower layer is made of bituminous material as a main component and contains inorganic fibers, organic fibers, rubber materials, stone powder, etc., and has a thickness of 3 mm and is highly flexible and self-adhesive at 120 to 180°C. A sheet having a specific gravity of 1.4 to 2.0 (manufactured by Nippon Sekiso Kogyo Co., Ltd., trade name: Sekiso Damper DAS) and cut to the size of the floor panel 7 of the vehicle is used. Vibration control sheet 2
is made larger than the cushion layer 3 by an amount of adhesive allowance 2A. The protective layer 4 is made of a roofing material having the same size as the cushion layer 3 and a thickness of 2 mm. This roofing material is made of paper sheets impregnated with bituminous material.
It is usually used for roofs of houses. The vibration damping sheet 5 for the upper layer has the same composition and dimensions as the vibration damping sheet 2 for the lower layer described above, has an adhesive margin of 5A on the outer periphery, and has a thickness of 2 mm. After layering the cushion layer 3 on the vibration damping sheet 2 for the lower layer so that the adhesive margin 2A on the outer periphery of the vibration damping sheet 2 protrudes from the cushion layer 3, the protective layer 4 is layered on the cushion layer 3. , arrange it so that it is in the same position as the cushion layer 3, overlay the damping sheet 5 for the upper layer on the arranged protective layer 4, match the adhesion margins 2A and 5A of both vibration damping sheets 2 and 5, and 2
A and 5A are temporarily fastened by inserting fasteners using a stapler as temporary fastening means 6 and temporarily fastening to form the composite soundproofing and vibration damping material 1. The composite vibration-damping and sound-insulating material 1 of this example is positioned so that the damping sheet 2 side is located on the floor panel 7, and then placed in a furnace at 140° C. to 190° C. and heated for 30 minutes. During heating in the furnace, both damping sheets 2 and 5 were softened, and due to the weight of the cushion layer 3, the protective layer 4, and the upper damping sheet 5, the shape conformed to the uneven shape of the floor panel 7, and was adhered to the floor panel 7. Also, due to the heating in the furnace, the vibration damping sheet 5 is softened and melted, and the vibration damping sheet 2 is bonded to the vibration damping sheet 2 at the bonding distance 5A.
A and the overall shape is formed along the floor panel 7. The composite soundproofing and vibration damping material 1 taken out of the furnace and returned to room temperature is adhered to the floor panel 7, and the cushion layer 3 and the damping sheet 5 improve the soundproofing and vibration damping properties. When in use, a pile carpet is laid on the damping sheet 5. (Example 2) In Example 1, the protective layer 4 in the composite vibration-damping and sound-insulating material 1 of Example 1 was replaced with a roofing material, and a composite vibration-damping and sound-insulating material (not shown) made of cardboard with a thickness of 1.5 mm was used. Obtained in the same manner. (Example 3) The composite vibration damping and sound insulating material 11 shown in FIG.
It is formed using the same parts as. That is, after the cushion layer 3 is stacked on the vibration damping sheet 2 so that the adhesive margin 2A on the outer periphery of the vibration damping sheet 2 protrudes from the cushion layer 3, the vibration damping sheet 5 for the upper layer is stacked on the cushion layer 3. , a protective layer 4 having the same shape as the cushion layer 3 is placed on the damping sheet 5 at the same position, and by combining the adhesive allowance 2A of the vibration damping sheet 2 and the adhesive allowance 5A of the vibration damping sheet 5, A stapler (not shown) is inserted into the adhesion margins 2A and 5A as a temporary fixing means 6 for temporary fixing, and the protective layer 4 is appropriately temporarily fixed (not shown) to form a composite vibration damping and soundproofing. Material 11 is used. Therefore, a cold resistance test was conducted on each of the composite vibration damping and sound insulating materials of Examples 1 to 3 described above. In addition,
In this test, a composite vibration damping and sound insulating material was heated and bonded to a floor panel with a rib height of 10 mm and a rib spacing of 30 mm at 140°C for 30 minutes, and then left to cool.
Leave it for an hour and leave it on the composite vibration damping and sound insulation material with a thickness of 15
Lay a carpet of mm and cover the peaks and valleys of the ribs.
A 200g steel ball was dropped, and the distance (height) in mm at which cracking occurred was determined. In addition, a person stepped on the carpet with leather shoes and stepped on it 10 times to check for cracks in the upper vibration damping sheet. As shown in FIG. 4, as a composite vibration damping and sound insulating material 21 of a comparative example, vibration damping sheets 2 and 5, which are larger than the cushion layer 3 and of heat-sealing type, are stacked on both sides of the cushion layer 3. overlapped sheet 2
A and 5A have a structure in which the clasp of a stapler is used as the temporary fixing means 6, and have a conventional structure in which no protective layer is provided. Composite vibration damping and soundproofing material 21 of comparative example
The material and thickness of each member are the same as in Example 1. The cold resistance test results were as shown in the table below.

[Table] As shown in the above table, the composite vibration-damping and sound-insulating materials of Examples 1 to 3 are found to have improved cold resistance compared to the conventional composite vibration-damping and sound-insulating materials. That is, when a roofing material is used, the damping material sheet and the roofing material are bonded more firmly to the bituminous material, which is advantageous because the load resistance is increased. In addition, the vibration damping and sound insulation properties of each of the composite vibration damping and sound insulating materials of Examples 1 to 3 were tested at room temperature (20°C) and at low temperature (-
When compared at 30°C, it was as good as the control. (Effects of the invention) The present invention is a composite vibration-damping and sound-insulating material in which vibration-damping sheets larger than the above-mentioned layers and heat-sealable are stacked on both sides of a cushion layer, and the overlapping margin of the stacked sheets is bonded by temporary fixing means. Since the protective layer is provided in the material, the above-mentioned problems can be solved. That is,
According to the present invention, like conventional composite vibration damping and sound insulating materials, it can be bonded to the surface of the vehicle by heat fusion and is easy to bond, and the protective layer prevents problems such as cracking at low temperatures and cracking under load. can be resolved.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a cross-sectional view of the composite vibration-damping and sound-insulating material, and Figure 2 being a usage diagram of the composite vibration-damping and sound-insulating material heat-sealed to the floor panel. , FIG. 3 is a sectional view of another example of the composite vibration-damping and sound-insulating material. FIG. 4 is a cross-sectional view of a composite vibration-damping and sound-insulating material of a comparative example. DESCRIPTION OF SYMBOLS 1, 11... Composite vibration damping and sound insulating material, 2, 5... Vibration damping sheet, 2A, 5A... Adhesive allowance, 3... Cushion layer, 4... Protective layer, 6... Temporary fixing means.

Claims (1)

[Claims for Utility Model Registration] (1) A heat-sealable damping sheet that is larger than the above layer is laid on both sides of a porous cushion layer with cushioning properties, and the overlap between the two damping sheets overlapped. In the composite vibration-damping and sound-insulating material which is joined by temporary fixing means, there is a layer on the upper layer vibration damping sheet or between the upper layer vibration damping sheet and the cushion layer, which has a high load capacity at low temperature and is almost the same as the cushion layer. A cold-resistant composite vibration damping and sound insulating material characterized by having a protective layer of the same shape. (2) The cold-resistant composite vibration-damping and sound-insulating material according to claim 1, wherein the protective layer is a roofing material made of a paper sheet impregnated with asphalt. (3) The cold-resistant composite vibration damping and sound insulating material according to claim 1, wherein the protective layer is a sheet of cardboard.