JPH0653404B2 - Molded sound absorbing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molded sound-absorbing material used in a part of a silencer such as an outer box and an engine cover where heat insulation, sound absorption and rigidity are required.

(Prior Art) Molded sound-absorbing material that is molded into a matte material such as glass wool to form a molding base material, and after the molding agent is applied to the surface of the molding base material, it is molded into a desired shape while heating between molds. Is known.

The procedure for molding the molded sound absorbing material will be described with reference to FIG. 3. First, as shown in FIGS. 3 (a) and 3 (b), a container
(1) Apply the molding agent (2) filled in the inside with a brush (3) to the surface of the molding base material (4) such as matte glass wool, and apply this to the top and bottom as shown in Fig. 3 (c). Set between the molds (5) and (6), and mix the molds (5) and (6) under heating to
A molded sound absorbing material (7) as shown in FIG.

Here, as shown in FIG. 4, the molded sound absorbing material (7) is impregnated with a part of the molding agent (2) in the molding base material (4), and the molding agent is formed on the surface of the molding base material (4). A hardened layer (8) is formed by hardening (2). By the way, there are irregularities (4a) on the surface of the forming base material (4), and therefore, the hardened layer (8) formed on the surface of the forming base material (4) following the irregularities (4a) has unevenness (8a). ), This unevenness
Conventionally, as shown in FIG. 3 (E), the coating material (9) is placed on the surface of the molded sound-absorbing material (7) which has been molded to fill the (8a). As shown in F), the molds (5) and (6) are re-matched to form the coating layer (10) on the surface of the hardened layer (8).

(Problems to be Solved by the Invention) As described above, in the related art, in order to fill up the irregularities remaining on the surface of the cured layer, the molding is performed once, and then the molding is performed by placing the coating material on the surface of the cured layer again. However, the molding process is complicated and there is a cost disadvantage.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, the fibrous reinforcing material is kneaded in the molding agent applied to the surface of the molding base material.

(Function) The reinforcing material contained in the molding agent penetrates into the concave portion of the molding base material so as to crosslink, and a concave portion following the concave portion of the molding base material does not occur in the cured layer.

(Example) Below, the Example of this invention is described based on an accompanying drawing.

FIG. 1 is a diagram showing a molding process of a molded sound absorbing material according to the present invention. In the present invention, first, as shown in FIGS. 1 (a) to (c), thermosetting is performed in a container (1). Molding agent such as resin solution
After filling (2), the fibrous reinforcing material (11) is put into the molding agent (2), and the molding agent (2) and the reinforcing material (11) are kneaded by the stirrer (12). Here, the reinforcing material (11) is a short fiber such as glass wool, ceramic fiber, metal fiber or polyester fiber.

Then, as shown in FIG. 1 (D), the molding agent (2) kneaded with the reinforcing material (11) is applied to the surface of the molding base material (4) with a brush (3) or the like. In addition, instead of applying with a brush (3), a molding base material
(4) may be placed directly in the container (1). Molding base material
(4) is an inorganic fiber such as glass wool or ceramic fiber,
Alternatively, an organic fiber such as polyester is cut to an appropriate length, and roller-pressed and needling is applied to this to make a mat-like one.

When the molding agent (2) is applied to the surface of the molding base material (4) in this way, a part of the molding agent (2) penetrates into the molding base material (4) and the other molding agents (2) flow into the molding base material (2). A layer is formed on the surface of the material (4). Then, the molding base material (4) is set between the upper and lower molding dies (5) and (6) as shown in FIG. 1 (E), and the molding base material (4) is set as shown in FIG. 1 (F). The molded sound absorbing material (7) having a predetermined shape is obtained by hot pressing the (4) between the molds (5) and (6).

As shown in the sectional view of FIG. 2, the molded sound absorbing material (7) has a hardened layer (8) formed by hardening of the molding agent on the surface of the molded base material (4), and the molded base material (4) and The stiffener (11) is mixed in each of the hardened layers (8). Further, since the reinforcing material (11) is cross-linked in the concave portion (4a) portion of the molding base material (4), the concave portion is reinforced and the hardened layer (8) is imitated following the concave portion (4a) of the molding base material (4). No recess is formed in the.

(Effects of the Invention) As described above, according to the present invention, since the reinforcing material is mixed in both the base material and the hardened layer of the molded sound absorbing material, the rigidity of the molded sound absorbing material is improved, and Since it is not necessary to further form a coating layer on the surface of the hardened layer as in the conventional case, the molding process can be greatly simplified, and many effects are exhibited.

[Brief description of drawings]

1 (a) to (F) are views showing a molding process of a molded sound absorbing material according to the present invention, FIG. 2 is a sectional view of the molded sound absorbing material, and FIGS. 3 (a) to (F) are conventional drawings. FIG. 4 is a cross-sectional view of a conventional molded sound absorbing material, showing the molding process of FIG. In the drawing, (2) is a molding agent, (4) is a molding base material, (5) and (6) are molds, (7) is a sound absorbing material, (8) is a hardened layer, and (11) is a reinforcement. It is a material.

Claims (1)

[Claims] 1. By applying a molding agent to the surface of the molding base material,
A molded sound-absorbing material obtained by impregnating a molding agent inside a molding matrix and forming a hardened layer of the molding agent on the surface of the molding matrix, wherein the molding agent contains a fibrous reinforcing material. Molded sound absorbing material.