JPH0566697U - Lightweight molded soundproof material - Google Patents

Abstract

(57) [Summary] [Purpose] To develop a lightweight molded soundproofing material that reduces the weight per unit area and is excellent in moldability and shape retention after molding. [Structure] A crepe paper 2 impregnated with a thermosetting resin is sandwiched between a sound absorbing layer 1 and a sound absorbing layer 1 ′ made of a plurality of or a single material selected from felt, synthetic resin foam material, and glass wool. A lightweight molded soundproof material characterized by being pressure molded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lightweight molded soundproof material having a reduced weight per unit area, and more particularly to a lightweight molded soundproof material having excellent moldability and shape retention after molding.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, for example, as a sound insulation material made of fibers for automobiles, a molding formed by heating and pressurizing felt made of animal and vegetable fibers and synthetic resin fibers alone or with an adhesive together with a non-woven fabric skin material. Soundproofing materials are manufactured.

However, although such a molded soundproof material is excellent in deep-drawing moldability, it does not provide satisfactory performance in sound absorption, strength, and rigidity, and further has a drawback that the weight per unit area of the soundproof material itself increases. there were.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to realize excellent sound absorption and deep drawing formability while reducing the weight of the sound insulation material itself of the molded sound insulation material made of fiber.

[0005]

[Means for Solving the Problems]

 As a solution to this problem, the inventors of the present invention have conducted intensive studies and found that the above problems can be solved by interposing a crepe paper impregnated with a thermosetting resin between the sound absorbing layers and then integrally molding the crepe paper. However, the gist of the present invention lies below.

[0006] A lightweight molded soundproof material, characterized in that a crepe paper 2 impregnated with a thermosetting resin is sandwiched between the sound absorbing layer 1 and the sound absorbing layer 1'and then pressure molded.

The lightweight molded soundproofing material according to claim 1, wherein the crepe paper 2 impregnated with the thermosetting resin is provided with holes.

The lightweight molded soundproof material according to claim 1 or 2, wherein the sound absorbing layer 1 and the sound absorbing layer 1 ′ are made of a plurality of or a single material selected from felt, synthetic resin foam material, and glass wool. .

The sound absorbing layers 1 and 1 ′ are required for exhibiting excellent sound absorbing performance, and those having excellent moldability and shape retention are used. Examples include bulky felt, glass wool, and synthetic resin foam material. For example, in the case of bulky felt, one or more discontinuous fiber materials of animal, vegetable or synthetic resin type and a thermosetting resin such as powdered phenolic resin or a binder such as thermoplastic fiber are mainly used. In the case of foam material, polystyrene, polypropylene, polyurethane, etc. are preferably used.

The crepe paper 2 sandwiched between the sound absorbing layers 1 and 1 ′ is also called crepe paper and is a paper with wrinkles such as crepe. It is essential that the crepe paper is impregnated with a thermosetting resin in advance. The thermosetting resin is a phenol resin, a polyester resin, a urethane resin, a melamine resin, a paraffin resin or the like, and the impregnation method is preferably dipping or coating. The amount of the thermosetting resin impregnated in the crepe paper is required to ensure the adhesion with the intermediate layer, and is preferably about 1 to 150% of the weight of the crepe paper.

It is preferable that the crepe paper 2 be provided with holes for venting air, and the shape and number of the holes are particularly preferable unless the disadvantage such as defective molding due to air pockets occurs when molding the soundproof material. Not limited.

As a method of integrally molding each of the constituent materials, for example, when the sound absorbing layers 1 and 1 ′ are both made of a thermosetting resin-containing felt having a thickness of 0.5 mm, and crepe paper is provided between them, Conditions of 1 to 200 kg / cm ² at ˜250 ° C. for 15 seconds to 2 minutes are preferable.

The present invention is particularly preferably used as a ceiling material for automobiles. In this case, a synthetic resin skin material such as vinyl chloride is laminated and attached, and the molded ceiling material is attached to a vehicle body roof panel by means of a clip or the like. .

[0014]

【Example】

 Examples will be given below to provide a more detailed understanding of the present invention. Naturally, the idea is not limited to the following examples.

[0015]

Example 1 Phenolic resin-impregnated crepe paper was sandwiched and laminated between bulky felts 1 and 1'consisting of 50 parts by weight of hemp and 50 parts by weight of glass fiber to be integrated. The integrated product was heated and pressed at 200 ° C. for 1 minute under the condition of 50 kg / cm ² to obtain a molded soundproofing material 1.

[0016]

Example 2 A crepe paper impregnated with a phenol resin was sandwiched between polystyrene foam materials 1 and 1 ′ to be integrated. 1 minute such monolith 210 ° C., to obtain a 50 kg / cm was heated pressing at a ^second condition Shimete molding deadening 2.

[0017]

[Comparative example]

A thin leaf-shaped non-woven fabric skin material is integrated with a 860 g / cm ² felt via an adhesive and heat-press molded at 210 ° C. for 50 seconds under the condition of 50 kg / cm ² to form a molded soundproofing material 3. Obtained.

[0018]

【Test method】

The weight per 1 m ^{2 of the} molded soundproofing material 1 to the molded soundproofing material 3 was measured, and the sound absorption coefficient was measured by the reverberation chamber method.

[0019]

【result】

The molded soundproofing material 1 had a weight of 870 g / m ² and a sound absorption coefficient of 0.6 (500 Hz). The molded soundproofing material 2 had a weight of 860 g / m ² and a sound absorption coefficient of 0.6 (500 Hz). The molded soundproofing material 3 had a weight of 1000 g / m ² and a sound absorption coefficient of 0.4 (500 Hz).

[0021]

[Effect of the device]

 It has been clarified that the molded soundproofing material according to the present invention can not only maintain a satisfactory soundproofing effect but also reduce the weight of the molded soundproofing material.

[0022]

[Brief description of drawings]

FIG. 1 is a sectional view of a molded soundproofing material according to the present invention.

[Explanation of symbols]

 1 sound absorbing layer 2 crepe paper 1'sound absorbing layer

Claims (3)

[Scope of utility model registration request] 1. A lightweight molded soundproof material, characterized in that a crepe paper (2) impregnated with a thermosetting resin is sandwiched between the sound absorbing layer (1) and the sound absorbing layer (1 ') and then pressure molded. 2. The lightweight molded soundproofing material according to claim 1, wherein the crepe paper 2 impregnated with the thermosetting resin is provided with holes. 3. The lightweight molded soundproofing according to claim 1, wherein the sound absorbing layer 1 and the sound absorbing layer 1 ′ are made of a plurality of or a single material selected from felt, synthetic resin foam material and glass wool. Material.