JPH0423786Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a sealed container made of fluorine-based resin that has chemical resistance and heat resistance and is used in the semiconductor or medical device fields.

[Conventional technology]

Conventionally, containers such as filter cartridges used in the process of manufacturing electronic components such as LSI,
Because they are exposed to strong acids and solvents for etching, they are mainly molded from fluororesin. Therefore, when connecting the lid body to the container body in a sealed manner, for example,
As disclosed in Publication No. 63-28653, the flanges formed at the edges of the connection between the main body and the lid are heat-sealed under pressure at a specific temperature, but fluorine resin has poor mechanical strength. For example, the flange part expands in the axial direction due to the internal pressure of the liquid circulating inside the container, which causes partial damage to the heat-sealed part and leakage of the internal liquid. During fusion, the flange portions of the main body and lid are in contact with each other and the periphery of the joint is heat fused, so a separate means is required to temporarily fix both flanges, and the heat fusion process is time-consuming. It was hot. In addition, a structure in which screws are formed in both the connecting parts of the main body and the lid, and the joined parts are heat-sealed after each screwing is considered, but this increases manufacturing costs and requires screwing work, making it difficult to assemble. This was a problem in trying to shorten the work.

[The problem that the idea aims to solve]

In view of the above-mentioned situation, the present invention aims to solve the problem by temporarily fixing the fluorine-based resin container body and lid body by fitting them together to ensure positioning, and then attaching the joint between the body and the lid body. The object of the present invention is to provide a sealed container made of fluorine-based resin in which the formed heat-sealed portion is not damaged by the internal pressure within the container or changes in the internal pressure, and the sealing performance can be improved.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a container formed by sealingly connecting a container body and a lid made of fluorine resin, with a lower opening that allows the connecting part of the main body to be fitted into the connecting part of the lid. an annular recess is formed, a protrusion is provided around one of the side surface of the connecting part of the main body and an inner surface of the annular recess, and a groove into which the protrusion can fit is provided around the other facing side surface. At the same time, with the protrusion fitted into the groove and the lid fitted to the main body, the joint portion of the main body and the lid are heat-sealed.

[Effect]

The fluorine-based resin container of the present invention, which is constructed as described above, has the connecting portion of the main body fitted into the annular recess formed in the connecting portion of the lid, thereby suppressing deformation of the connecting portion of the main body due to internal pressure. Further, a protrusion provided around the side surface of one of the connecting portions of the main body and the lid body is fitted into a groove provided around the side surface of the other connecting portion to position the main body and the lid body, It reliably restricts displacement in the axial direction and seals the body and lid by heat-sealing the joint.

〔Example〕

Next, details of the present invention will be explained based on illustrated embodiments.

FIG. 1 shows a typical embodiment of the present invention;
The figure shows an enlarged view of the main parts, and 1 in the figure shows the container main body, and 2 in the figure shows a lid body that closes the main body 1. The main body 1 and the lid 2 are molded from a fluorine-based resin that is chemically resistant to strong acids for etching and cleaning solvents used in manufacturing semiconductor electronic components. In addition to the typical tetrafluoroethylene resin (PTFE), we also use tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene/hexafluoropropylene copolymer resin (FEP), Examples include tetrafluoroethylene/ethylene copolymer resin (ETFE) and polyvinylidene fluoride (vinylidene fluoride) resin (PVDF).

The main body 1 is formed into a bottomed cylindrical shape with an opening on one side, and the opening end is a connecting part 3a, and the outer surface of the connecting part 3a has a substantially trapezoidal cross section with a steep bottom. A protrusion 4 is provided around the circumference.

The lid body 2 is formed into a shallow cylindrical shape with an open end and a bottom, and similarly to the above, the open end is a connecting portion 3b, and the connecting portion 3a of the main body 1 is connected to the connecting portion 3b. A downwardly opening annular recess 5 into which the protrusion 4 can be fitted is formed, and a groove 6 into which the protrusion 4 can be fitted is provided around the inner surface of the annular recess 5.

And an annular recess 5 of the connecting portion 3b of the lid body 2.
At the same time, the connecting part 3a of the main body 1 is fitted inside, and the protrusion 4 is fitted into the groove 6, and then the joint part 7 of the main body 1 and the lid body 2, that is, in the illustrated case, the connecting part 3a of the main body 1 is fitted. The outer surface and the edge of the lid body 2 are locally heated to a temperature higher than the melting point and fixed in a pressurized state, and this joint part 7 is formed.
The main body 1 and the lid 2 are integrally connected and sealed by a heat-sealed portion 8 formed around the entire circumference.

The second embodiment shown in FIG. 3 has a structure in which the positional relationship between the protrusion 4 and the groove 6 is reversed. 6 is provided around the circumference, and a protrusion 4 is provided around the inner surface of the annular recess 5 of the lid body 2.

In addition, when using the fluorine-based resin sealed container of the present invention as an outer container of a filter cartridge, for example, as shown in FIG. A through-hole is formed, and a filter 15 of an appropriate structure is housed inside.

[Effect of idea]

As described above, according to the fluorine-based resin sealed container of the present invention, with the connecting part of the lid body fitted externally or internally to the connecting part of the main body, the connecting part of the lid body is attached around the side of the connecting part of one of the main body and the lid body. By fitting the protrusion into the groove provided on the side surface of the other connecting part, it is possible to reliably restrict the axial displacement of the main body and the lid, and to prevent the joining of the main body and the lid. By heat-sealing the parts, it is possible to seal and fix them, and when internal pressure is applied to the main body and the lid, stress is applied to the main body and the lid in the direction of movement in the axial direction, but the protrusion and the recess are Because the joint does not shift in the axial direction due to the fitting relationship of the grooves, the heat fusion bond is more Since stress due to deformation is not easily applied to the parts, the heat-sealed part does not partially come off and the internal liquid does not leak.

Further, a downward opening annular recess into which the connecting portion of the main body can be fitted is formed in the connecting portion of the lid, a protrusion is provided around one side of the connecting portion of the main body and the surface of the annular recess, and the other side is provided with a protrusion. Since a concave groove into which the protrusion can be fitted is provided on the facing side, when the connecting part of the main body is fitted into the annular recess, the connecting part moves inward and outward due to internal pressure or changes in internal pressure. There is no change at all, therefore, no undue stress is applied to the heat-sealed portion, and its sealing performance can be reliably maintained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a typical embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a main part thereof, and FIG. 3 is a vertical cross-sectional view of a main part showing a second embodiment. 1...Body, 2...Lid, 3, 3a, 3b...
Connecting portion, 4... Projection, 5... Annular recess, 6... Concave groove, 7... Joining part, 8... Heat fusion part, 14... Inlet/outlet, 15... Filter.

Claims (1)

[Scope of utility model registration request] In a container formed by sealingly connecting a container body and a lid made of fluororesin, a downwardly opening annular recess into which the connecting portion of the main body can be fitted is formed in the connecting portion of the lid, and the connecting portion of the main body A protrusion is provided around one of the side surface and the inner surface of the annular recess, and a groove into which the protrusion can fit is provided around the other facing side surface, and the protrusion is fitted into the groove. 1. A sealed container made of fluorine-based resin, characterized in that the joint portion of the main body and the lid are heat-sealed with the lid fitted onto the main body.