JPS61225399A - Filler material of vortex gasket - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] A spiral gasket is made by winding a metal band plate as a hoop material having a curved cross-sectional shape such as a wave shape and a band-shaped filler material multiple times in a spiral shape. The present invention relates to filler materials for such spiral gaskets, and particularly relates to filler materials based on inorganic fibers.

Conventional filler materials of this type generally consist of a filling material made of heat-resistant inorganic fibers such as asbestos fibers, glass fibers, ceramic fibers, metal fibers, etc., clay minerals such as kaolin, clay, and talc, and rubber. It is made of inorganic paper obtained by making paper with a binder such as cellulose.

By the way, inorganic fibers, with the exception of asbestos fibers, have very small fiber diameters, do not disperse uniformly in water, and are difficult to make into paper. It is difficult to make paper into paper.

Therefore, the shape of filler materials based on inorganic fibers other than asbestos fibers is only maintained by the binder blended with them, and the shape retention of binders such as rubber is not very strong. Coupled with the fact that it is not a filler material, it cannot be expected to maintain its shape sufficiently.For this reason, spiral wound gaskets using such filler materials have poor sealing properties, and their range of use has been greatly limited. Furthermore, since bonding materials such as rubber have poor heat resistance,
Under such high-temperature conditions, the shape of the filler material cannot be expected to be maintained by the binder, but the sealing performance will be significantly reduced.

In this respect, since asbestos fibers are fine fibers, they can be easily formed into a single paper, and a filler material with excellent shape retention in which the fibers are sufficiently entangled can be obtained.

Therefore, asbestos filler material has excellent shape retention, mechanical properties such as tensile strength, flexibility, and resilience, so it is possible to obtain spiral wound gaskets with excellent sealing properties. Furthermore, even under high-temperature conditions where binding materials cannot be expected to maintain shape, the intertwining of the fibers maintains its shape, so it has excellent heat resistance and exhibits excellent sealing performance even under high-temperature conditions. We can provide spiral wound gaskets.

As described above, asbestos filler material is superior to other inorganic filler materials in all respects, and no inorganic filler material equivalent to asbestos filler material has yet appeared, let alone one that is superior to asbestos filler material. The reality is that in conventional spiral gaskets, asbestos filler material is exclusively used.

However, due to its nature, asbestos easily generates a large amount of dust when handled, and it is said that inhalation of this dust over a long period of time can lead to cancer, asbestos disease, and mesothelioma, in which asbestos dust is deposited on the lungs and skin. As described above, it is not sanitary for those involved in the production of asbestos filler materials, and asbestos is in short supply as a resource, and this trend is only getting stronger year by year.

Therefore, in recent years, there has been a strong demand for the development of inorganic filler materials to replace asbestos filler materials.

The present invention was made in response to such demands, and although it uses inorganic fibers other than asbestos fibers, it can be used satisfactorily as a substitute for asbestos filler materials in terms of the sealing performance of spiral gaskets. Of course, another object of the present invention is to provide a filler material having properties superior to asbestos filler materials.

The filler material of the present invention that solves this problem is made of non-owns other than asbestos fiber as a base material and contains sepiolite.

As the inorganic fiber that is the base material, it is preferable to use one or more types of various inorganic fibers other than asbestos fiber, or generally to use heat-resistant glass fiber, ceramic fiber, etc. The amount of inorganic fiber blended is 10 to 10. Preferably, it is 45 parts by weight.

No AI again! The M1 fiber diameter of the fiber is preferably less than the 1JL layer, and the fiber length is preferably 3 to 50 mm.

By the way, when considering heat resistance, inorganic fibers such as ceramic fibers have particularly excellent heat resistance! Although it is preferable to use a ceramic fiber, etc., due to its nature, it cannot be made with a fiber diameter of 11L. It is preferable to use an appropriate amount of glass fiber, etc., which has a slightly inferior heat resistance but can make the fiber diameter less than IJL, in an appropriate amount. It is preferable to use 5 to 15 parts by weight of fibers with a fiber diameter of less than 1JL.

In addition, sepiolite is a natural clay mineral whose main components are silicic acid and magnesium oxide, and it is naturally produced in fibrous and powdered forms. It is preferable to use the former, and the blending amount is preferably 10 to 70 parts by weight.

The filler material of the present invention, like conventional filler materials, is obtained by paper-making the above-mentioned inorganic fibers and sepiolite and other appropriate fillers such as talc, but as mentioned at the beginning, the inorganic fibers are asbestos fibers. Despite the fact that it is difficult to make paper with the exception of It can be finished into high quality inorganic paper by hardening) and can be easily obtained by paper making.

Although the filler material of the present invention is based on inorganic fibers other than asbestos T11#l, it can of course be used as a substitute for asbestos filler materials due to the inclusion of sepiolite. In fact, it has better properties than asbestos filler materials.

In other words, sepiolite has dry and solidifying properties, and has the functions of both a filling material and a binding material, and this solidifying power is extremely strong compared to conventionally used binding materials such as rubber. Therefore, even if it cannot be expected that the shape of the filler material will be maintained due to the entanglement of inorganic fibers, the shape of the filler material will be maintained sufficiently strongly, and it will be equivalent to asbestos filler material in terms of mechanical strength, flexibility, and resilience. Or even better. Moreover, the consolidation strength of sepiolite is limited to high temperature ranges, such as the temperature at which asbestos crystallization water is lost (
It hardly deteriorates even in the high temperature range (generally about 550° C.) or higher, and has better heat resistance than asbestos filler material. This heat resistance becomes more remarkable when inorganic fibers with excellent heat resistance are used as the base material.

Therefore, if the filler material of the present invention is used.

It is possible to provide a spiral gasket that can exhibit sealing performance equal to or better than that of a spiral gasket using asbestos filler material, which is the most excellent of conventional inorganic filler materials.

These points will become clearer from the examples described below.

(Example) The filler material of this example had a fiber diameter of 0.4 ml,
! 11c 3-50 am (1) Glass 11!10 parts by weight, fiber diameter 2-3 mm, fiber length 3-50 cm ceramic fiber 20 parts by weight, fibrous sepiolite 30 parts by weight,
30 parts by weight of talc, 5 parts by weight of cellulose pulp, 3 parts by weight of binder and 2 parts by weight of flocculant were made into paper to obtain an inorganic paper with a thickness of 0.6 mm and a bulk density of 0.7 g/c. Moreover,
This was cut into a tape shape with a width of 15w+s.

The glass fiber used is rM manufactured by Nippon Sheet Glass Co., Ltd.
LF4AJ was used, the ceramic fiber was ``Ibiwool Bulk'' manufactured by Ibigawa Electric Industry Co., Ltd., and the sepiolite was ``Need Plus ML-'' manufactured by Takeda Pharmaceutical Company Limited.
100 DJ was used for each.

The mechanical strength, especially the tensile strength, of the filler material in this example is
Bulk density 0.8g/Cn'1'' with the same dimensions as this
As a comparative example, a conventionally known asbestos filler material was subjected to a comparative test, and the results shown in Table 1 below were obtained. In addition, this tensile strength test was conducted at a tensile rate of 20
This was done by pulling at 0■■/proverb.

In addition, in order to change the temperature conditions, each filler material at room temperature, 400°C, 600°C at a heating rate of 100°C per hour,
After heating to 800°C, tensile strength tests were conducted using each filler material immediately after 10 hours had passed while maintaining these temperatures.

Table 1 From this test result, it can be understood that the filler material of the present invention is superior to asbestos filler materials in tensile strength, crushing, and mechanical strength, regardless of temperature conditions, and In contrast to the tensile strength that rapidly decreases as the temperature increases, the filler material of the present invention shows no such change, confirming that the filler material of the present invention has excellent heat resistance. . This is considered to be due to the characteristics of sepiolite as a binder.

Further, using the filler material of the above example, an inner diameter of 90 mm,
A spiral-wound gasket (■) with an outer diameter of 110 layers was manufactured, and a spiral-wound gasket (■) of the same dimensions was manufactured using the same hoop material and the filler material of the comparative example, and both spiral-wound gaskets I and II were manufactured. The performance of compression rate, decompression rate,
A comparative test of the amount of leakage was conducted, and the results shown in Table 1 and Table 2 were obtained. This performance test was performed using a tightening surface pressure of 200 kg/c.
rn' using 1 kg/crf N2 gas as a sealing fluid. In addition, in order to change the temperature conditions, each spiral gasket at room temperature and 100% per hour
After heating to 400°C, 600°C, and 800°C at a temperature increase rate of 10°C, a performance test was conducted using each spiral wound gasket immediately after 10 hours had passed while maintaining these temperatures.

Table 2 From this test result, the spiral-wound gasket I using the filler material of the present invention has superior sealing performance than the conventional spiral-wound gasket ■ using the asbestos filler material regardless of temperature conditions. One thing is understood. It is also clear that the spiral gasket is superior in terms of recovery rate.

Especially as the temperature conditions get higher, the spiral gasket)
The superiority of I has become extremely remarkable, and it has been confirmed that the spiral wound gasket using the filler material of the present invention can exhibit particularly excellent sealing performance in the medium and high temperature range of 400 to 800°C. . With spiral wound gaskets, sealing performance decreases rapidly as temperature conditions increase, but
This is considered to be because, as is clear from the results of the tensile strength test in Table 1, asbestos loses its crystal water and rapidly changes when the temperature approaches 550°C.

In addition, if inorganic fibers with a fiber diameter of less than 1 layer are used as in the above example, the entanglement of the fibers can be further increased 9 and made stronger, which improves the flexibility and recovery properties of the filler material, as well as the spiral shape. The sealing performance of the gasket can be improved, and the wet strength during paper making can be increased.

Claims (1)

[Claims] A filler material for spiral wound gaskets, which is characterized by having an inorganic fiber other than asbestos fiber as the base material and containing sepiolite.