JPS6112149B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large-diameter gasket mainly made of a sheet material made of phenolic fiber.

Generally, gaskets are manufactured by punching a single sheet of gasket material, and the maximum diameter of the gasket that can be manufactured is limited by the size of the gasket material used or the equipment such as a punching machine.

Therefore, for example, the maximum diameter of a gasket manufactured using sheet material with standard dimensions of 600 mm square in length and width is approximately 600 mm, and to manufacture a gasket larger than that, huge manufacturing equipment is required. Gaskets could not be easily obtained.

Moreover, in the case where the gasket is formed by integrally punching out a gasket, there are many scraps of sheet material, resulting in an increase in cost.

Therefore, the present invention forms divided pieces of a large-diameter gasket using sheet materials of small dimensions, and by joining the divided pieces to manufacture a large-diameter gasket, it is not only possible to provide the gasket at a low cost, but it is also similar to an integrally molded product. The present invention aims to provide a large-diameter gasket mainly made of phenol fiber, which is the most preferable gasket material and has excellent strength and sealing properties.

An embodiment of the present invention will be described below in detail with reference to the drawings. In Figs. 1 to 3, reference numeral 1 denotes a large-diameter circular gasket made of phenolic fiber impregnated with fluororesin, and arc-shaped divided pieces 2, 2, 2 corresponding to the divided shape of this gasket in the circumferential direction are shown. As shown in FIG. 2, each is formed by punching or cutting out a fluororesin-impregnated phenol fiber sheet material 3, and after cleaning the abutment portion 2a of each divided piece 2, the abutment is formed as shown in FIG. 3A. A polyimide film 4 is pasted on both the upper and lower surfaces of the portion 2a, and then, as shown in FIG. intervene,
Further, other polyimide films 4', 4' are attached to the outer peripheries of the upper and lower polyimide films 4, 4, and the right divided piece 2 is fixed to the fixing base 7 of the fusing device 6 as shown in FIG. 3C.

Then, the upper and lower heaters 10 and 11 sandwich the upper and lower surfaces of the abutment portions 2a, 2a, and pressurize the left divided piece 2 in the direction of the arrow.

Then, the temperature of the upper and lower heaters 10 and 11 is raised to 350° C., and baking is carried out under pressure for 5 minutes.

After baking, it may be cooled while being pressurized.

At the time of baking, the fusion material 5 is baked in a state impregnated into the divided piece 2, so both the left and right abutment parts 2 are baked.
a and 2a are firmly connected to form a completely integrated structure.

If other abutment portions 2a are also connected in the same manner, a large-diameter gasket 1 as shown in FIG. 1 can be obtained.

Note that the fluororesin has heat resistance, and this combines with the heat resistance of the divided pieces 2 to provide excellent heat resistance, so that the heat resistance of the gasket as a whole does not deteriorate.

In the above embodiment, a case has been described in which the end face shape of the abutment part of the divided piece is formed into a plane perpendicular to the upper surface of the divided piece, but the end face shape may be formed into a stepped shape on the side as shown in FIG. 4. Further, it may be formed into an inclined surface as shown in FIG. 5, or may be formed into a planar stepped shape as shown in FIG.

Note that the planar shape of the gasket is not limited to the above-mentioned shapes, but also those shown in Figs. 7, 8, 9, and 1.
It is also possible to manufacture large gaskets of various irregular shapes, such as the one shown in Figure 0.

As shown in the above embodiments, the large-diameter gasket according to the present invention has divided pieces of the large-diameter gasket formed of a fluororesin-impregnated phenol fiber sheet material,
It is formed by piecing together the divided pieces, and can be formed using a sheet material with a small standard size.Moreover, the divided pieces to be formed from this sheet material are small and can be placed at any position, and the sheet material can be used effectively and can be provided at low cost without increasing material costs.

Moreover, the joints of the divided pieces are fused together using a fusion material made of fluororesin.
Its bonding force is strong, and it also has high sealing properties and heat resistance.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a perspective view showing divided pieces before connection, FIG. 3 is a sectional view showing the manufacturing process, and FIG. Figure 4~
9 shows another embodiment, FIGS. 4 and 5 are partial sectional views of the connected state, FIG. 6 is a partial plan view, and FIG.
8 and 9 are overall plan views. 1...Large diameter gasket, 2...Divided piece, 2a
...Abutment part, 3...Sheet material, 5...Fusion material.

Claims (1)

[Claims] 1. A large-diameter gasket to be manufactured is divided in the circumferential direction, and divided pieces each having a shape corresponding to the divided shape are formed from a fluororesin-impregnated phenol fiber sheet material, and between the joint parts of each divided piece, a fluororesin is formed. A large-diameter gasket with a bonding structure in which matching abutments are interposed with a fusing material.