JPH0712234A - Gasket for high temperature/high pressure device and its manufacture - Google Patents

Abstract

PURPOSE:To keep a gasket stably in the high pressure and high temp. environment and prevent it from rupture at the time of pressurizing by forming it with an inclination over a certain specified angle by reference to the truncation face of a truncated cone and by making it from a material of paper nature. CONSTITUTION:A gasket concerned is formed in a truncated cone having an inclination 2 over 20 deg. by reference to the truncation face 1 of truncated cone, and it is made from a material of paper nature. The material is shaped into a large disc in compliance with the anvil and cylinder which are installed in a high temp./high pressure device, and a minor disc part concentrical therewith is cut away, as the first Process, followed by the second Process, in which at least one cut is formed toward the bore generated by the cutting-away. In the third Process, the resultant is shaped into a truncated cone in which the minor disc constitutes the truncation face 1, and thus the gasket as object is accomplished. This permits keeping stably with a high pressure and at a high temp., and rupture at the time of pressurizing can be precluded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for a high temperature and high pressure apparatus and a method for producing the same, and more specifically to a high temperature and high pressure for synthesizing diamond, cubic boron nitride or a sintered body containing them. The present invention relates to a gasket for a high temperature and high pressure device which is a pressure medium used in the device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a gasket used in a belt-type or girdle-type high temperature and high pressure apparatus is an electrical and thermal insulator, is excellent as a pressure medium, and is disposable with one pressurization. Therefore, it is a big requirement that the material is inexpensive. Although proposed as a gasket material that meets these requirements, sodium chloride,
There are pyrophyllite, talc, alumina cement, ceramics containing zirconia as a main component, paper, asbestos, rubber, soft steel plate, resin, etc.

Among these conventional gasket materials, as a typical example of those proposed for paper gaskets,
There is Japanese Patent Publication No. 53-34190.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication No. S53-3419
Japanese Patent Publication No. 0 is divided into an inner gasket for an inner steep inclined surface and an outer gasket arranged on the outer periphery of the inner gasket, and the outer gasket having a gentle inclined surface is a flat plate-shaped paper, asbestos, glass. Sheet, rubber plate,
It describes a high temperature and high pressure apparatus provided as a laminated plate made of one or more kinds of materials such as a soft steel plate, a polyethylene sheet, and a Teflon sheet.

The flat sheet circular paper gasket described in the above publication has excellent requirements as a gasket for a high temperature and high pressure device, but only a part of a gently inclined surface can be used, and an outer gasket and an inner gasket are not used. Need to be molded separately, and there is a problem that when they are arranged in a high temperature and high pressure apparatus, they are displaced or deformed. Further, when the flat plate-shaped paper gasket of the above publication is used as a gasket for a steep slope, there is a problem that abnormal deformation due to breakage or wrinkling occurs and high pressure cannot be maintained.

The present invention has solved the above-mentioned problems. Specifically, it is excellent in pressure generation efficiency, very inexpensive, easy to work for forming a gasket, and high in temperature and high pressure. An object of the present invention is to provide a gasket for a high temperature and high pressure device which is easy to install and handle in the device and a method for producing the same.

[0007]

Means for Solving the Problems The present inventor has been studying a gasket for a high temperature and high pressure apparatus. As a result, a paper gasket can be obtained by selecting a paper thickness and a paper quality and processing and forming the gasket into an optimum shape. The present invention has been completed on the basis of the finding that the above shows the maximum requirements as a gasket for a high temperature and high pressure device, and that it is excellent in pressure generation efficiency that can generate an ultrahigh pressure particularly at a high temperature.

That is, the gasket of the present invention is formed into a frustoconical body having an inclination of 20 degrees or more with respect to the frustoconical surface of the frustoconical body, and is formed of a paper-like material. This is a gasket for high temperature and high pressure equipment.

The paper-like material in the gasket of the present invention is not particularly limited in terms of material, and specifically, for example, conventionally used printing paper, gravure paper,
Non-coated paper such as writing paper, art paper, coated paper, coated paper such as coated printing paper, graft paper, packaging paper such as roll paper,
Processed base paper, photosensitive paper, statistical machine card paper, color fine paper,
Mention may be made of hybrid paper such as electrically insulating paper or paperboard, corrugated paper and tissue paper. Among these paper-like materials, uncoated paper or hybrid paper is particularly preferable because it has excellent moldability.

If the thickness of the paper-like material becomes too thick, the workability deteriorates, and step formation occurs in the overlapped portion of the cut portions in the manufacturing method described later, resulting in poor pressure generation efficiency. On the contrary, if the paper-like material becomes too thin, it is necessary to prepare a large number of frustoconical objects in order to obtain a gasket having a certain thickness, and the workability deteriorates. . Therefore, the thickness of the paper-like material is 0.1 to 1 m.
m thickness is preferable, and 0.3 to 0.7 mm thickness is particularly preferable. When the frusto-conical gasket formed of these paper-like materials is arranged in a high temperature and high pressure apparatus, at least 10 sheets are laminated and put into practical use.

The gasket of the present invention is formed by forming a predetermined paper-like material into a large disc-shaped body in accordance with the anvil and cylinder installed in a high-temperature high-pressure apparatus, and from the large disc-shaped body to the large disc-shaped body. The first step of cutting out or punching out the small disc-shaped body portion having the same central axis as the body and deleting the small disc-shaped body portion from the outer periphery of the large disc-shaped body is formed. 2) Make at least one notch toward the inner circumference
It can be produced through a step and a third step of superimposing the cut portions and fixing them with an adhesive, a cellophane tape, or the like, and forming into a truncated cone shape in which the small disk-shaped body portion becomes the truncated surface. .

In practical use, the gasket of the present invention is formed by laminating at least 10 frustoconical gaskets, each of which is manufactured by one sheet. Although it is possible to stack the gaskets of the frusto-conical shape at random, it is preferable to stack the next paper from the position where the cutouts are stacked in the third step. When the gasket thus laminated is pressed at a pressure of several kg / cm ² to several tens of kg / cm ² to fix the shape of the truncated cone, the handling and workability in the subsequent steps are improved. Is preferable.

[0013]

[Example] Jujo papermaking 0.45 mm thick high-pigeon paper was used to prepare a disk with a diameter of 110 mm, and a disk with a diameter of 50 mm having the same central axis was extracted from the disk, and 110φ × 50φ A shape of × 0.45 mm was produced.

Next, one incision is made in the radial direction toward the inner periphery formed by extracting from the outer periphery of the disc, and the disc is fitted to the umbrella-shaped forming die having a slope of 35 degrees. The notches were overlapped and fixed with cellophane tape.

The cut portions of the discs produced in the same manner as described above were superposed on the places fixed with cellophane tape, and were laminated in order.

In this way, 15 sheets of 110φ × 50
A frusto-conical body in which φ × 0.45 mm discs are laminated is placed on a steel mold of the same shape and pressed at a pressure of 50 kg / cm ² , and then the outer circumference is fixed with two places of cellophane tape. The gasket of the present invention shown in 1 was produced.

Using the gasket of the present invention thus obtained, a high-pressure high-temperature test was conducted using an FB type high-temperature high-pressure apparatus equipped with an anvil and a cylinder having a slope angle of 30 degrees, and a high pressure of 65 kb and a high temperature of 2000 ° C. were obtained. I could keep it stable.

Further, using the same paper quality and disk shape as described above, a gasket of the present invention having 17 laminated layers and a gasket of the present invention having 20 laminated layers are produced by the same manufacturing method, and the same FB as described above is produced. When a high-pressure high-temperature test was carried out using a mold high-temperature high-pressure apparatus, the former could stably maintain a high pressure of 65 kb and a high temperature of 2000 ° C, and the latter could stably maintain a high pressure of 55 kb and a high temperature of 2000 ° C. The relationship between the hydraulic pressure and the generated pressure at this time is shown in FIG.

For comparison, using the same paper quality as the above-mentioned gasket of the present invention, an outer diameter of 110 mm cut out from an inner diameter of 50 mm described in JP-B-53-34190.
When a comparative gasket in which 9 flat plate circles were laminated and a comparative gasket in which 12 circular plates were laminated were manufactured and a high pressure and high temperature test was conducted using the same FB high temperature and high pressure apparatus as described above, the former was in the initial stage of pressurization (pressure of about 5 kb). The gasket was abnormally deformed by rupture, and the latter could not be used because the gasket ruptured before being pressed.

[0020]

INDUSTRIAL APPLICABILITY The gasket of the present invention has a higher pressure when used in a high-temperature and high-pressure device equipped with a steeply inclined anvil and a cylinder, particularly an FB type or girdle type high-temperature and high-pressure device, as compared with the conventional flat sheet circular paper gasket. It has the effect that it can be stably held at high temperature and that it does not break when pressurized. Compared to gaskets made of other materials that have been conventionally used, workability and workability are simple and easy. There is an effect that the pressure medium is inexpensive and stable, and the pressure generation efficiency is excellent.

[Brief description of drawings]

FIG. 1 is a perspective view of a frustoconical gasket of the present invention manufactured in an example.

FIG. 2 is a diagram showing a relationship between hydraulic pressure and generated pressure when a high pressure and high temperature test is performed in an example.

[Explanation of symbols]

 1 Crest face 2 Slope a Hydraulic pressure and generated pressure in 17-layer laminated gasket b Hydraulic pressure and generated pressure in 20-layer laminated gasket

Claims (2)

[Claims] 1. A frustoconical body having a frustoconical surface as a reference 20
A gasket for a high temperature and high pressure device, which is a frusto-conical body formed with an inclination of not less than 100 degrees and is formed of a paper-like material. 2. A first step of forming a large disc-shaped body from a paper-like material, and deleting a small disc-shaped body portion having the same central axis as the large disc-shaped body from the large disc-shaped body. A second step of forming a cut portion from the outer circumference of the large disc-shaped body toward the inner circumference formed by removing the small disc-shaped body portion, and stacking the cut portions to form a small disc-shaped body And a third step of forming a frustoconical body having a truncated surface.