JPH04327144A - Cap for reduced pressure container and sealing method therefor - Google Patents

Abstract

PURPOSE:To seal up a reduced pressure container by using an easily openable cap for the reduced pressure container. CONSTITUTION:A supporting part that touches the upper end 6 of an opening of a container and a sealing part 5 of a cap whose top board 1 is extended outwardly are arranged so that they come to a position being the inside of a face extending from the undersurface of the top board 1, and facing the center of the cap. Thereby opening of the cap can be executed by relatively small force.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a vacuum container cap and a vacuum container seal that can seal a vacuum container using the vacuum inside the container and close and open the cap with a small force. Regarding the method.

0002

2. Description of the Related Art As conventional caps for vacuum containers, many caps for sealing the inside of containers are known, such as those disclosed in Japanese Patent Publication No. 1-59179, Japanese Utility Model Publication No. 45-27915, and Japanese Patent Application Laid-open No. 57-22825. ing. In these known caps, for example, a convex cap top plate is fitted inside the open end of the container, and the vacuum inside the container is used to spread the cap top plate to obtain a pressure-bonding force for sealing inside the container. In addition, in order to obtain a seal under normal pressure, the cap top plate, which is slightly wider than the diameter of the opening end of the container, is pushed into the container, and the seal is created using a pressure force that causes the deformation of the cap top surface to return to its original state. When the inside of the container is made into a high vacuum, these caps have an even stronger crimp force, resulting in a sealing effect. However, on the other hand, there is a drawback that a large torque is required when opening the bottle. On the other hand, if a cap with a flat top plate is used, the top surface will bend inward due to the vacuum, and the 45° tapered surface, which is the sealing surface of the cap, will be strongly pressed against the open end of the container. Since the top plate of the seal part has no wall thickness and its shape makes it easy to be drawn into the inner surface, the effect of lifting the top plate by lifting the cap is small, and vacuum breakage is less likely to occur. Therefore, there is a drawback that the opening torque increases significantly when the cap is strongly pressed in a high vacuum.

0003

[Problem to be Solved by the Invention] The above conventional technology is
In both cases, the outer circumferential wall of the cap or the inner circumferential wall provided at the inner circumferential wall and the circumferential wall of the opening of the container are pressed together to seal the inside. Because of this structure, in order to always align and seal the container and the lid, it was necessary to use mechanical force, such as a screw structure, to tighten the container so strongly that the lid was slightly deformed. Once the lid is closed, the vacuum is difficult to break, as described above, and a large amount of force is required to close the lid, and a large torque must also be applied to remove the lid. In other words, since the surface contact friction between the lid and the peripheral wall of the container is large due to the sealing with this structure, the opening torque inevitably has to be quite large.

To explain in detail, when attempting to open a conventional cap when the inside of the container is vacuum-packed, the vacuum cannot be removed unless the top of the cap, which is fitted inside the container, is pulled up to the top of the opening end of the container. cannot be destroyed. If destruction occurs, the cap is easily opened. However, until then, the cap must be lifted against the force of drawing the cap into the container and the friction caused by the seal portion being pressed against the inner wall of the opening end of the container. There are problems such as having to turn the cap many times to obtain the amount of lift that destroys the vacuum, or the cap being too tight and not turning, and even if the cap is turned, it quickly becomes a cap that does not feel free. There is. This tendency is especially true when the degree of vacuum inside the container is high and the deformation of the top surface is large. These drawbacks are caused by the basic means of sealing the container opening with the lid and the structure of the container opening and lid.

[0005]

[Means for Solving the Problems] The present inventor has researched a cap for a vacuum container that can be closed and opened with a small force, and has made it possible to open and close the cap with a small force by utilizing the vacuum of the container. I knew I could get it. In other words, the vacuum container is automatically sealed when the sealing surface of the cap comes into contact with the inner peripheral surface of the opening of the container, so no other force or structure is required, and unless the vacuum is broken, sealing will occur. This alone is enough to maintain it. In other words, it is important that the sealing part eliminates the action of excessive external force. These external forces unnecessarily make it difficult to open the container, which is inconvenient. In order to utilize such reduced pressure, it is impossible to use a cap with a conventional structure, and a special structure is required to seal the fitting part of the cap that fits into the opening of the container and the structure of the top plate of the cap using reduced pressure. The present invention was completed by clarifying that the structure must be made as follows.

[0006] The present invention has the following features: 1. A disk-shaped top plate (1) projecting outward in an arcuate manner, a cylindrical outer circumferential wall (2) connected to the periphery of the top plate and hanging downward, and an inner wall. A fitting groove (4) that fits into the opening of the ring-shaped container surrounded by the peripheral side wall and the cylindrical outer peripheral wall is provided, and a ring-shaped reinforcing wall (10) is provided at the peripheral edge of the lower surface of the top plate. A fixing part (9) is provided on the inner circumferential surface of the cylindrical outer circumferential wall and is connected to a fixing part provided on the side wall surface of the opening of the container. ), the fitting groove (A) is located between the cylindrical outer circumferential wall and the inner circumferential side wall, and at a position closer to the center of the cap than the surface extending from the lower surface of the top plate that projects in an arc shape. Top surface (7
) and a support part that contacts the opening end surface of the container to restrain the top plate; and (B) a sealing surface (5) formed by the outer peripheral surface of the inner peripheral side wall that contacts the inner peripheral surface of the upper opening end of the container. A cap for decompression containers equipped with a contact part. 2. The cap for a reduced pressure container according to claim 1, wherein the sealing surface of the inner circumferential side wall of the cap is a slope inclined toward the center of the cap. 3. The sealing surface of the cap has an outwardly convex arc shape,
The cap for a reduced pressure container according to claim 1 or 2. 4. The cap for a reduced pressure container according to any one of claims 1 to 3, wherein the ring-shaped inner peripheral side wall is integrally formed with the top plate. 5. The cap for a reduced pressure container according to any one of claims 1 to 4, wherein the fixing portion provided on the inner circumferential surface of the cylindrical outer circumferential wall of the cap is a screw. 6. 7. The cap for a vacuum container according to claim 1, wherein the top plate projecting outward in an arcuate manner has a curved surface or a polygonal pyramidal convex surface. 7. A disk-shaped top plate that extends outward in a convex arc shape (1
), a downwardly hanging cylindrical outer peripheral wall (2) connected to the periphery of the top plate, and a ring-shaped reinforcing wall (1) on the periphery of the lower surface of the top plate.
0), a ring-shaped inner peripheral side wall (3) hanging downward from this wall, and a fitting that fits into the opening of the ring-shaped container surrounded by the inner peripheral side wall and the cylindrical outer peripheral wall. Matching groove (4)
A screw cap is provided with a fixing part (9) arranged on the inner circumferential surface of the cylindrical outer circumferential wall to connect with a fixing part provided on the opening side wall surface of the container, the cylindrical outer circumferential wall and the inner circumferential side wall being connected to each other. (A) A top surface (7) of the fitting groove is formed at a position between the two and at a position closer to the center of the cap than the extended surface of the bottom surface of the top plate extending in an arc shape, and is in contact with the opening end surface of the container. A cap for a reduced pressure container is provided with a support portion for restraining the top plate and (B) a seal abutment portion consisting of a seal surface (5) formed by the outer peripheral surface of the inner peripheral side wall, and is placed over the top surface of the open end of the container. With the lid closed, the upper surface (6) of the opening end of the container is brought into contact with the top surface of the ring-shaped fitting groove to support the cap, and the sealing surface of the inner peripheral side wall is brought into contact with the periphery of the opening end of the container. A reduced pressure container sealing method in which the seal abutting portion is restrained at the open end and the contact sealing surface between the support surface of the fitting groove and the inner circumference wall is sucked into the container by the reduced pressure inside the container to seal the container. ” related.

[0007]

[Function] The first feature of the present invention is that the upper top plate of the cap is outwardly convex. This is because if the inside of the container is under reduced pressure, the flat top plate will deform into a convex shape inward, resulting in increased friction between the cylindrical circumferential wall of the cap and the circumferential wall of the container, resulting in a disadvantage that the opening torque increases. The top plate of the cap may be convex in a curved arc shape, or may be convex in a polygonal pyramid shape. A second feature of the present invention is that the seal abutting part and the support part of the cap are located closer to the center of the cap than the extension of the lower surface of the top plate. A third feature of the present invention is that the outer circumferential surface of the inner circumferential side wall of the cap is formed into a slope inclined toward the center of the cap to form a contact sealing surface. With the fitting groove in the above position, when the fitting groove of the cap is fitted into the opening of the container, the contact sealing surface of the cap comes into contact with the inner peripheral edge of the end of the opening of the container, and the pressure inside the container is reduced. seal more closely. The contact width between the two is narrow, but because the position is a special position located in the space closer to the center of the cap than the line extending from the bottom of the top plate, the downward force due to the reduced pressure applied to the top plate In other words, the force that draws the cap into the container acts perpendicularly to the contact sealing surface that forms the inclined surface, and this force is divided into vertical and horizontal components on the inclined surface, and the horizontal component is applied to the sealing surface. is pushed towards the circumferential edge of the cap, pressing it against the opening circumference of the container, while the vertical component forces the sealing surface downwardly, also pressing it against the opening circumference of the container. Due to the action of these two component forces, sealing is achieved very well, although the width is narrow. Since there is no tightening by any other means, the contact area is small, and the friction is low, the bottle can be opened with a small torque. In addition, the support part that restrains the top plate provided in the fitting groove of the cap prevents the top plate from deforming.
This prevents an increase in the frictional force between the inner circumferential wall of the cap and the circumferential wall of the container.

The above features will be explained in detail. The reason why the seal abutting part of the cap must be closer to the center of the cap than the extension line of the bottom of the top plate.When a vacuum cap is sealed with a vacuum inside the container, atmospheric pressure causes the top surface of the cap to leak into the container. There is a force that tries to pull you in. The cap is strongly pressed against the upper part of the open end of the container by the force of this vacuum. Therefore, a top surface at the open end of the container is required to support vertical forces. Furthermore, by making the top surface of the cap dome-shaped, the deflection of the top surface deformed by the vacuum is transformed into horizontal displacement, which is restrained by the inner surface of the opening end of the container, resulting in the effect of crimping a part of the cap. There is. When modeling this mechanism, the open end of the container that contacts the cap is divided into a support surface and a sealing surface. Consider the vacuum cap based on the positional relationship between the extension line of the top plate surface, the support part, and the seal part.

(a) From the standpoint of seal effectiveness, the further the seal portion is removed from the extension line toward the circumferential edge of the cap, the more the cap is crimped due to bending deformation, making it impossible to efficiently utilize horizontal force. Furthermore, since the seal mainly uses repulsive force due to bending deformation of the material, deterioration such as creep is likely to occur and the seal function is likely to be lost. b. Effect of rotational moment at the support point In a case where the cylindrical outer wall of the cap has an external thread, when the support part is moved out of the extension line toward the circumferential edge of the cap, a rotational moment is generated in the support part due to the vacuum force. This has the effect of pulling up the threaded section, thereby tightening the threads. This causes the opening torque to become high. c. Ease of opening due to differences in lift movement amount. Details will be explained in a comparative example, but there are cases where both the support part and the seal part are located closer to the center of the cap than the extension line of the bottom surface of the top plate, and cases where only the seal part is extended. In the latter case, when the cap is turned to open the cap, a long lift is required to break the contact between the inner surface of the container and the cap seal. During this time, the cap must be moved against atmospheric pressure and friction with the inner surface of the container, making the cap difficult to open. In the former case, decompression failure occurs with a small amount of movement, and opening becomes easy. The wider the cap shape and the higher the degree of vacuum, the more difficult it is to open the latter form. In this way, by providing the sealing part of the cap around the top plate, which is closer to the center of the cap than the extension of the lower surface of the top plate of the cap, the inner peripheral wall of the cap is sealed using the reduced pressure inside the container. Sealing is performed by dividing the downward force of the top plate due to reduced pressure into the horizontal and vertical directions on the sealing surface, which is a new sealing method discovered for the first time by the inventor, which allows the valve to be opened and closed with a small force. effective. If the inner circumferential edge of the opening of the container is brought into contact with the sealing surface of the inner circumferential wall of the cap as an inclined surface, the seal will be better, but since the contact width is narrow, the friction will not be large and opening will be easy. The sealing surface of the cap may be arcuate rather than sloped. In this case as well, the force is divided in the horizontal and vertical directions at the contact portion with the periphery of the opening of the container, and a similar sealing effect is achieved.

[0010] The cap of the present invention provides a sufficient seal when it is placed over the opening of the container, but it is also possible to provide a suitable screw on the inner surface of the cylindrical outer peripheral wall of the cap and engage it with the screw on the outer periphery of the container. It's okay. This structure does not tighten the cap onto the container, but makes it easier to lift the cap, and is used when re-capping a container that has been opened and depressurized. This fixing also has the effect of preventing the seal from breaking due to impact during handling. This is because if the reduced pressure is removed, the closure utilizing reduced pressure, which is a feature of the present invention, will no longer be possible. The inner peripheral wall of the cap of the present invention may be integrally molded with the cap, but a ring-shaped peripheral wall having a triangular or semicircular cross section may be separately molded and arranged. The cap of the present invention may be made of synthetic resin or metal, but if it is molded from a hard material, it is preferable to arrange an inner circumferential wall separately molded from synthetic resin. The contact sealing surface of the inner circumferential wall of the cap is not a packing, but the top plate of the cap is drawn into the container by reduced pressure and seals by coming into close contact with the periphery of the opening of the container. If so, it is sufficient. Again, the seal of the present invention is not achieved by surface contact between the circumferential wall of the container and the circumferential wall of the cap. Sealing is achieved by the contact between the top surface of the fitting groove provided at a specific position of the cap and the top surface of the opening end of the container due to reduced pressure, and the contact between the contact sealing surface of the inner circumferential wall of the cap and the narrow width around the periphery of the container opening. , these contacts are not surface contacts, but rather linear contacts. The cap of the present invention restrains the deflection of the top surface of the cap due to vacuum at the open end of the container to prevent deformation, so there is little friction between the cap and the peripheral wall of the container, and the cap can be lifted while maintaining its shape when rotated. Therefore, contact between the sealing portions is easily broken and vacuum breakdown occurs quickly, resulting in a vacuum cap that is easy to open and gives a sense of release. On the other hand, with flat-shaped caps, the top surface is drawn into the container and bends and deforms, so even if you lift the deformed cap, the contact with the seal is difficult to break and it is difficult to release it. . The cap rotates but does not open.

[0011]

EXAMPLES Next, the present invention will be explained in detail based on examples, and a comparative test with a conventional cap will be shown. FIG. 1 shows an embodiment of the present invention, and shows a cross-sectional front view of a container covered with a cap. FIG. 2 is an enlarged view showing the sealed state of the cap and the upper end of the opening of the container shown in FIG. As is clear from FIGS. 1 and 2, the top plate 1 of the cap is upwardly convex. Reference numeral 2 denotes a downwardly hanging cylindrical outer wall connected to the periphery of the top plate, and a fixing protrusion 9 that fits into a fixing part on the outer periphery of the container is arranged on the inner circumferential side. The container may be fixed to the container in the form of a screw, or simply by combining the upper and lower surfaces of the convex portions. Reference numeral 3 denotes a ring-shaped inner circumferential wall installed at the lower peripheral edge of the top plate and hanging downward, and a fitting groove 4 is formed between the inner circumferential wall and the outer wall to fit with the opening upper end of the container. There is. Reference numeral 7 designates the top surface of the fitting groove, and when the cap is covered, it comes into contact with the open upper end 6 of the container, thereby forming a support portion that restrains and supports the top plate of the cap. Reference numeral 5 denotes the outer circumferential surface of the inner circumferential wall, which is a slope slanting diagonally downward, forming a sealing surface. Reference numeral 8 denotes the inner circumferential surface of the upper end of the container opening, which is a slope slanting inward of the container. A seal abutting portion is formed between the cap sealing surface 5 and the inner circumferential surface 8 of the upper end of the container opening. When the cap is placed on the container, the upper end of the opening of the container is inserted into the fitting groove, and the upper end surface 6 of the opening comes into contact with the top surface 7 of the fitting groove of the cap to restrain and support the top plate of the cap. Further, the sealing surface 5 of the inner circumferential wall 3 of the cap comes into contact with the inner circumferential surface 8 of the upper end of the opening of the container. The container is thus sealed between the support and the sealing surface 5. Since the inside of the container is under reduced pressure, a force acting on the top plate draws it into the container. Then, the upwardly convex top plate is pushed downward and spread laterally, producing a so-called toggle effect, and the sealing surface 5 is pressed against the inner peripheral surface 8 of the upper end of the opening to perform sealing. On the other hand, the upper end surface 6 of the container opening and the top surface 7 of the fitting groove are in contact with each other, but this portion is responsible for supporting the top plate rather than a seal, and restrains the top plate to prevent unnecessary deformation.

With this structure, sealing is performed exclusively between the sealing surface of the cap and the narrow inner peripheral surface of the upper opening of the container, and the supporting portion prevents unnecessary deformation of the top plate.
The deformation prevents an increase in friction at the seal abutting portion and reduces the force that breaks the seal, so-called opening force. That is, since there is little deformation of the top plate, the friction of the support part is small when the cap is opened, and the friction of the seal part is also small, so the cap can be raised with a small torque. When the seal contact part separates, the vacuum is broken and the cap can be opened easily. As can be understood from this example, the support part that restrains the top plate and prevents unnecessary deformation of the top plate and the seal contact part are not located closer to the center of the cap than the extension of the bottom surface of the top plate. As a result, the restraint of the top plate by the support portion becomes weaker, and the deformation of the top plate increases, so that the opening torque does not become smaller. A ring-shaped reinforcing wall 10 provided closer to the center of the cap than the fitting groove on the outer peripheral edge of the lower surface of the top plate increases the restraining force of the top plate and prevents unnecessary deformation of the top plate. A ring-shaped inner peripheral side wall 3 is provided on the lower surface of this reinforcing wall.

FIG. 3 shows another embodiment in which the sealing surface 5 of the inner circumferential wall of the cap is an arcuate curved surface. This sealing surface has a narrow width, is almost linear, and comes into contact with the inner circumferential surface of the upper end of the opening of the container, which has the advantage of reducing the opening force.

FIG. 4 shows a comparative example in which the top plate is flat,
The top plate is pushed into the container and is greatly deformed into a downward concave shape, the cylindrical outer wall opens outward, and the opening upper end 6 of the container does not support the top surface 7 of the cap, so no supporting part is formed and the seal abuts. The joints can be pressed very hard and the seal will not break. Therefore, the opening torque becomes extremely large, making it difficult to open the cap.

FIG. 5 shows another comparative example in which the supporting portion of the cap and the abutting sealing surface are located closer to the peripheral edge of the cap than the surface extending from the lower surface of the top plate. With such a structure, even if the top plate has an outwardly convex arc shape, the top plate is pushed into the container and is greatly deformed into a downward concave shape, and the cylindrical outer wall opens outward, causing the opening upper end 6 of the container to open. does not support the top surface 7 of the cap, so no support part is formed, and the seal abutting part is pressed very strongly and the seal is not broken. Therefore, the opening torque becomes extremely large, making it difficult to open the cap.

Next, in order to explain the effects of the present invention, a comparative test and its results will be shown. Comparative Test 1 Opening Torque Test The caps used are shown in Figure 1 for Example 1, Figure 3 for Example 2,
Comparative Example 1 is the cap shown in FIG. 4 Comparative Example 2 is the cap shown in FIG. 5, which is a screw cap molded from polypropylene resin with a screw provided on the inner peripheral surface of the outer wall of the cap. On the other hand, the container was a screw bottle made of stainless steel with an inner diameter of 59 mm and equipped with a screw on the outer periphery of the upper end of the opening. The surface forming the abutting seal on the inner periphery of the open end of the container is a slope with a width of 1.1 mm, and the surface supporting the cap is 0.7 mm wide. The resin weight of the cap and the thickness of the top plate are as shown in Table 1.

[0017]

[Table 1]

In the test, capping was performed at an opening torque of 40 [kgf·cm], and the opening torque was measured by hand. The test results are shown in Table 2.

[0019]

[Table 2]

[Note] Opening torque is (kg5 cm)
It was expressed as From this test result, it is understood that the cap of the present invention can be opened with a small force. It is clear that if the top plate is flat, a large amount of force is required to open the bottle. Furthermore, it is understood that even if the top plate is made to protrude in an arc shape, if there is no support part that restrains and supports the top plate at the opening of the container, the opening torque will be large. Comparative test 2 Top plate deflection test Test method: Measure the deflection at the center of the cap. The results are shown in Table 3.

[0021]

[Table 3]

[Note] The amount of deflection is expressed in (mm). This test shows that when the top plate is flat, the deflection increases and the top plate deforms. Furthermore, it can be seen that even if the top plate is outwardly convex, if the cap does not have a supporting portion, the top plate will sag significantly. It is understood that when the top plate bends, the adhesion force of the abutting seal portion increases and the friction also increases, so a large force is required to open the bottle.

[Effects] According to the present invention, opening of the cap can be facilitated by arranging the abutting seal portion and the supporting portion of the cap at a position sandwiched between the extension lines of the upper and lower surfaces of the top plate.

[0023]

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a covered state of the cap of the present invention.

FIG. 2 is a partial cross-sectional view of the cap of the present invention.

FIG. 3 is a partial cross-sectional view of the cap of the present invention.

FIG. 4 is a partial cross-sectional view of a cap of a comparative example.

FIG. 5 is a partial cross-sectional view of a cap of a comparative example.

[Explanation of symbols]

1...Top plate 2...Cylindrical outer wall ３　…　Inner peripheral wall 4…Fitting groove 5... Seal surface 6... Opening top end surface 7...Top surface 8... Inner circumference of the upper end of the opening 9...Fixed protrusion 10... Upper part

Claims (7)

[Claims] Claim 1: A disk-shaped top plate (1) projecting outward in an arcuate manner, a cylindrical outer peripheral wall (2) connected to the periphery of the top plate and hanging downward, and an inner peripheral side wall and a cylindrical-shaped top plate (1). A fitting groove (4) that fits into the opening of the ring-shaped container surrounded by the outer peripheral wall is provided, and a ring-shaped reinforcing wall (10) is provided at the peripheral edge of the lower surface of the top plate.
A ring-shaped inner circumferential wall (3) that hangs downward from this wall, and a fixing part (3) that connects to a fixing part provided on the opening side wall surface of the container on the inner circumferential surface of the cylindrical outer circumferential wall. 9), a fitting groove (A) is located between the cylindrical outer circumferential wall and the inner circumferential side wall, and at a position closer to the center of the cap than the surface extending from the lower surface of the top plate projecting in an arc shape. The top surface of (
(B) a sealing surface (5) formed by the outer peripheral surface of the inner peripheral side wall that contacts the inner peripheral surface of the upper end of the container opening; A cap for decompression containers equipped with a seal abutting part. 2. The cap for a reduced pressure container according to claim 1, wherein the sealing surface of the inner circumferential side wall of the cap is a slope inclined toward the center of the cap. 3. The cap for a vacuum container according to claim 1, wherein the sealing surface of the cap has an outwardly convex arc shape. 4. The cap for a vacuum container according to claim 1, wherein the ring-shaped inner peripheral side wall is integrally formed with the top plate. 5. The cap for a reduced pressure container according to claim 1, wherein the fixing portion provided on the inner circumferential surface of the cylindrical outer circumferential wall of the cap is a screw-like screw. 6. The cap for a reduced pressure container according to claim 1, wherein the top plate projecting outward in an arcuate manner has a curved surface or a polygonal pyramidal convex surface. Claim 7: A disk-shaped top plate (1) projecting outward in an arcuate manner, a cylindrical outer peripheral wall (2) connected to the periphery of the top plate and hanging downward, and a lower surface of the top plate. A ring-shaped container having a ring-shaped reinforcing wall (10) disposed at the peripheral edge, a ring-shaped inner circumferential side wall (3) hanging downward from this wall, and surrounded by the inner circumferential side wall and the cylindrical outer circumferential wall. A screw having a fitting groove (4) that fits with the opening of the container, and a fixing part (9) arranged on the inner circumferential surface of the cylindrical outer circumferential wall to connect with a fixing part provided on the side wall of the opening of the container. (A) in the cap, at a position between the cylindrical outer circumferential wall and the inner circumferential side wall and at a position closer to the center of the cap than the surface extending the lower surface of the top plate projecting in an arc shape;
Seal contact consisting of a support part that forms the top surface (7) of the fitting groove and restrains the top plate by coming into contact with the open end surface of the container, and (B) a seal surface (5) formed by the outer peripheral surface of the inner peripheral side wall. A cap for a reduced pressure container having a cap disposed thereon is placed over the top surface of the open end of the container, and the top surface (6) of the open end of the container is brought into contact with the top surface of the ring-shaped fitting groove to support the cap. At the same time, the sealing surface of the inner circumferential side wall is brought into contact with the periphery of the opening end of the container, and the seal abutting part is restrained by the opening end of the container, and the contact sealing surface of the supporting surface of the fitting groove and the inner circumferential viewing wall is brought into contact with the opening edge of the container by reducing the pressure inside the container. A vacuum container sealing method that seals the container by drawing suction into the container.