Sheet-like gasket and process for manufacturing same

A gasket and sheet-shaped technology, which is applied to the sealing of engines, other household appliances, engine components, etc., can solve the problems of small compression, low elasticity, leakage, etc., and achieve good sealing effect

Inactive Publication Date: 2007-04-04
NICHIAS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, compared with the uncompressed sheet gasket, the compressed sheet gasket has lower elasticity and less compression
Therefore, when there are irregularities on the flange surface, leakage may occur due to the gap between the sheet gasket and the flange.
Furthermore, in this case, it is necessary to fasten with a stronger force, and the larger the sheet gasket, the stronger the required fastening force, and depending on the situation, it may become difficult to fasten.

Method used

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  • Sheet-like gasket and process for manufacturing same
  • Sheet-like gasket and process for manufacturing same
  • Sheet-like gasket and process for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] (Production of gasket substrate sheet)

[0096] Put 15 parts by mass of base fiber (aramid fiber) and 1000 parts by mass of water into the refiner, disperse the base fiber in water, add 30 parts by mass of rubber material (NBR) and 40 parts by mass of filler (kaolin clay) Parts by mass, 15 parts by mass of rubber medicine, and 10 parts by mass of coagulant, to obtain a raw material slurry. Then, the raw material slurry was sheet-formed with a cylinder paper machine, and then dried at 100° C. for 1 hour to obtain a gasket substrate sheet with a thickness of 3.0 mm.

[0097] (Manufacture of sheet gasket)

[0098] The gasket substrate sheet was punched into a ring shape with an inner diameter of 35 mm and an outer diameter of 74 mm, and then pressed with a mold A at a temperature of 100° C. to obtain a compressed sheet with a flat portion thickness of 1.5 mm. At this time, the compression rate D is 0%, and the compression rate E is 50%. Next, the compressed sheet was heated in...

Embodiment 2

[0103] (Production of gasket substrate sheet, production of sheet gasket and evaluation of sealing performance)

[0104] Except that mold B was used instead of mold A, the same method as in Example 1 was used. At this time, the compression rate D is 0%, and the compression rate E is 50%. In addition, the density of the flat part of the obtained sheet-like gasket was 2.0 g / cm 3 , The density of the flange is 1.0g / cm 3 . The evaluation results of the sealing performance are shown in Table 1.

[0105] Mold B: a ring shape with an inner diameter of 35mm and an outer diameter of 74mm. The top view of mold B is the same as mold A, along X 1 -X 1 The end view when the face is cut is shown in FIG. 5. In Fig. 5, the cross-sectional shapes of the recesses 27a and 27b are both part of a circle with a radius of 1.5 mm, and the arcuate part corresponds to 1 / 3 of the circumference of the circle with a radius of 1.5 mm. The shape of the lower member 26 and the shape of the upper member 25 are ve...

Embodiment 3

[0107](Production of gasket substrate sheet, production of sheet gasket, and evaluation of sealing performance)

[0108] Except that mold C was used instead of mold A, the same method as in Example 1 was used. At this time, the compression rate D is 0%, and the compression rate E is 50%. In addition, the density of the flat part of the obtained sheet-like gasket was 2.0 g / cm 3 , The density of the flange is 1.0g / cm 3 . The evaluation results of the sealing performance are shown in Table 1.

[0109] Mold C: a ring shape with an inner diameter of 35mm and an outer diameter of 74mm. The plan view of mold B is the same as that of mold A, along X 1 -X 1 The end view when the face is cut is shown in FIG. 6. In addition, the cross-sectional shape of the recess 32 in FIG. 6 is a rectangle with a width of 3.0 mm and a height of 0.75 mm, and the shape of the lower member 31 and the shape of the upper member 30 are vertically symmetrical. In addition, the unit of dimensions in the figure is ...

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Abstract

A sheet-like gasket having a dense structure and exhibiting excellent sealing performance with a small clamping force even on an irregular flange surface is provided. The sheet-like gasket is obtained by molding a composition comprising a substrate fiber, a rubber material, a filler, and a rubber chemical into a sheet, having a bead on both sides or one side, and having a flat part with a density of 1.0 g / cm<3 >or higher, the bead having a density lower than the density of the flat part.

Description

Technical field [0001] The present invention relates to a sheet-shaped gasket used in a wide range of fields such as petrochemical plants, various industrial machinery, automobiles, food, and home appliances for sealing the connection parts of high-pressure equipment and the like. Background technique [0002] Sheet gaskets are used, for example, when they are sandwiched between flange surfaces of high-pressure pipes when high-pressure pipes are connected to each other. In addition, since the sheet-shaped gasket can be punched and used, it is excellent in terms of being easy to deal with various sizes and different shapes, so it can be used in a wide range of fields such as the aforementioned petrochemical plants. [0003] Generally, sheet-shaped gaskets are manufactured by the following method: using a refiner to disperse the base fiber in water, and then adding rubber materials, fillers and rubber chemicals to obtain a raw material slurry, and then using a papermaking machine t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/10B29C69/00B29C43/00B29C35/02B29L31/26
CPCF16J15/104
Inventor 糸井克丰齐藤浩史
Owner NICHIAS CORP
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