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Gasket sheet and method for manufacturing same

A technology of sealing gasket and manufacturing method, which is applied in the directions of engine sealing, chemical instruments and methods, papermaking, etc., can solve the problems of reduced tensile strength, falling off, high rigidity, etc., and achieves the effect of excellent sealing.

Inactive Publication Date: 2006-01-25
NICHIAS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in conventional joint sheets, the base fibers used are inorganic or organic fibers other than asbestos. Compared with asbestos, the fiber diameter is larger and the rigidity is higher. When it is 50 to 85% by weight, in the step of laminating the material on the side of the heat roll using a calender roll, unevenness occurs on the surface of the material, and the balance of the load acting on the material is broken, so it cannot fall off from the roll, and it is produced flaky
Therefore, there is a problem that, unlike asbestos bonding sheets, a relatively large amount of base fiber cannot be blended, and the tensile strength is significantly lower than that of asbestos bonding sheets.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]The organic fibers are poured into a homogenizer together with water to prepare a well-dispersed first slurry of the organic fibers. Next, in the first slurry, the remaining rubber, filler and rubber additives are added to obtain a slurry-like raw material. Then, a pulp sheet with a thickness of 3.0 mm was produced by a cylinder papermaking machine, and then dried at a temperature of 100° C. for 1 hour, and then the dried pulp sheet was passed between hot rollers at 100° C. Rolling was carried out under a load with a linear pressure of 100 kgf / cm or more to obtain a sheet having a thickness of 1.5 mm. By subjecting the sheet to vulcanization treatment at a temperature of 150° C. for 30 minutes, an NA sheet-shaped sealing gasket having a thickness of 1.5 mm was obtained. In addition, the input amount of each raw material in the slurry was such that the composition of the finished NA sheet-shaped gasket was in the ratio given in Table 1. In Table 1, the values ​​are % by...

Embodiment 2

[0025] Except having used the material shown in Table 1 according to the compounding ratio shown in Table 1, it carried out by the method similar to Example 1. The results are given in Table 2.

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PUM

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Abstract

The non-asbestos sheet gasket is obtained by making a slurry containing an organic fiber, a rubber, a filler, and rubber chemicals into a sheet, drying the sheet, and rolling the dried sheet. The organic fiber is contained in an amount of at least 30% based on the sheet gasket. The invention provide an NA (non asbestos) sheet gasket having excellent sealability and tensile strength equivalent to that of an asbestos sheet gasket.

Description

technical field [0001] The present invention relates to non-asbestos sheet gaskets (hereinafter also referred to as "NA sheet gaskets") used in a wide range of fields such as petrochemical plant equipment, various industrial machinery, automobiles, ships, and home appliances. and methods of manufacture thereof. Background technique [0002] The bonding sheet is produced by sufficiently mixing rubber dissolved in a solvent with a base fiber, a filler, and a rubber additive by a high-speed mixer (Henschel Mixer) or the like to prepare a mixed material composition, Next, this mixed material composition is put between a pair of calender rolls consisting of a hot roll heated to about 150°C and a cold roll kept at about 20°C, and the solvent is evaporated while laminating on the hot roll side. , vulcanization, and peel off the sheet that has reached the specified thickness from the hot roll. [0003] In the past, asbestos bonding sheets using asbestos in the base fiber have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10C08L21/00
CPCC09K3/1028D21H13/26F16J15/102D21H17/35
Inventor 糸井克丰齐藤浩史
Owner NICHIAS CORP
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