JP2012111523A - Pressure tight case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure tight case excellent in sealability between a flange of a case body and a lid, suitable as a tennis ball case to contain lawn tennis balls by increasing a pressure in the case and sealing the case.SOLUTION: The pressure tight case includes: an upward-opening bottomed-cylindrical-case body 1; and a lid 2 which is fixed to an opening of the upward-opening bottomed-cylindrical-case body 1 by double seaming while being sealed with a first sealing agent 3 and a second sealing agent 4. The case body 1 is made of a PET and the lid 2 is made of aluminum. The first sealing agent 3 is applied to an under surface of an inner ring part 2b and the second sealing agent 4 is applied to an under surface of a flange 1f, and the double seaming is performed.

Description

  The present invention relates to a pressure-resistant container in which a metal lid is attached to a synthetic resin container body. Specifically, the container body is covered with a lid, and the peripheral edge of the lid and the peripheral edge of the lid are double-wrapped. The present invention relates to a pressure-resistant container that is fastened and has a lid attached to the container body. The present invention relates to a pressure-resistant container suitable as a container in which a hard tennis ball is sealed under pressure.

  Synthetic resin containers manufactured by blow molding synthetic resin such as polyethylene terephthalate (PET) instead of metal cans are widely used as storage containers for items that should be stored under pressure such as tennis balls. It has come to be.

  When using a synthetic resin container as a pressurized container for storing tennis balls, etc., as in the case of a metal can, the container is filled with the contents, and then protrudes from the opening edge of the container under pressure. A metal container lid is double-tightened to the flange portion thus closed to close the container, and the inside of the container is sealed in a pressurized state (Patent Document 1).

  FIGS. 7A and 7B show the pressure-resistant wide-mouth container 10 of Patent Document 1. FIG. The container 10 is a tennis ball container integrally formed from polyethylene terephthalate, and has a cylindrical body part 11, a flange part 13 projecting from the outer periphery of the wide mouth 12 at one end of the body part 11, and the body part 11. And a bottom 14 that closes the other end. The bottom portion 14 is recessed in a dome shape and has a shape that is not easily deformed even when an internal pressure is applied to the container 10.

  After the container 10 is filled with the tennis ball, the inside of the container 10 is pressurized, and the wide mouth 12 is closed by the aluminum container lid 25 as shown in FIG. Double-tighten to seal the pressure in the container 10. For this double winding, a winding machine called a seamer is used. While pressurizing the inside of the chamber in the seamer, the container lid 25 is double-wrapped around the flange portion 13 as shown in FIG. At this time, a sealing agent 26 is applied in advance to the back surface of the outer peripheral portion of the container lid 25 to enhance the sealing performance of the tightened portion between the container lid 25 and the flange portion 13.

FIG. 9 is a perspective view of a container containing a tennis ball. The internal pressure of the contained tennis ball B into the container 10 is atmospheric pressure (e.g., 1 kgf / cm ²⁾ plus about 0.8 kgf / cm ^2. The internal pressure of the container 10 is atmospheric pressure (for example, 1 kgf / cm ² ) plus 0.5 to 1.5 kgf / cm ² , and the internal pressure of the tennis ball accommodated in the container 10 is maintained.

JP 2000-95224 A

  In the container of Patent Document 1, the sealing agent 26 is interposed only between the front side of the flange portion 13 and the peripheral portion of the lid 25, the sealing performance is insufficient, the internal pressure of the tennis ball is reduced, etc. The quality of tennis balls cannot be guaranteed for a long time. An object of the present invention is to provide a pressure-resistant container that improves the sealing performance between the container body and the lid and can ensure the quality of the tennis ball over a long period of time.

  The pressure-resistant container according to claim 1 is configured such that a metal lid is put on the inlet portion of a synthetic resin container body having an outward flange at the inlet portion, and the lid and the flange are overlapped to be double-tightened. In the state before double-tightening, the peripheral edge of the lid projects outward from the peripheral edge of the flange, and the lid overlaps the front side of the flange. In a pressure-resistant container in which the peripheral edge of the lid is folded back to the back side of the flange by winding and the overlapping part of the peripheral edge of the lid and the flange is bent along the outer peripheral surface of the container body, the front side of the flange A first sealing agent that seals between the peripheral edge portions of the lid and a second sealing agent that seals other portions are provided.

  The pressure vessel according to claim 2 is characterized in that, in claim 1, the second sealing agent seals between the back side of the flange and the lid.

  The pressure vessel according to claim 3 is characterized in that, in claim 1, the second sealing agent seals between the peripheral portion of the lid and the outer peripheral surface of the container main body.

  The pressure-resistant container according to claim 4 is the pressure-resistant container according to claim 1, wherein the second sealant includes a tip end portion of the lid and the flange bent along the outer peripheral surface of the container main body, and the outer peripheral surface of the container main body. This is characterized in that the corners of the seal are sealed.

  A pressure-resistant container according to a fifth aspect is the pressure-resistant container according to the first aspect, wherein the lid includes a peripheral wall portion along an inner peripheral surface of the container main body, and the second sealant includes an outer peripheral surface of the peripheral wall portion and the container. The space between the inner peripheral surface of the main body is sealed.

  A pressure-resistant container according to a sixth aspect is the tennis ball container according to any one of the first to fifth aspects, wherein the tennis ball container is filled with a hard tennis ball under pressure.

  In the pressure-resistant container of the present invention, the second sealant is interposed not only in the first sealant between the front side of the flange of the container body and the lid, but also in other parts. The sealing performance can be improved and the quality of the tennis ball can be ensured over a long period of time.

It is a partial expanded sectional view of the pressure vessel which concerns on embodiment. It is sectional drawing before double winding of the pressure vessel of FIG. It is sectional drawing in the middle of the double winding of the pressure vessel of FIG. It is a partial expanded sectional view of the pressure vessel which concerns on another embodiment. It is a partial expanded sectional view of the pressure vessel which concerns on another embodiment. It is explanatory drawing of the heating method of a flange part. It is sectional drawing which shows a prior art example. It is sectional drawing which shows the conventional double winding. It is a perspective view of a tennis ball container.

  The first embodiment will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a double-clamped portion of a container body and a lid of a pressure-resistant container according to the first embodiment, and FIG. 2 is a cross-sectional view showing a state before double-clamping of the container body, FIG. 3 is a sectional view showing a state in the middle of double winding.

  The pressure vessel shown in FIG. 1 has a lid 2 fixed by double winding to a top opening of a bottomed cylindrical container body 1 whose bottom is closed and whose top is open. The sealant 4 was sealed. The container body 1 is made of a synthetic resin, and in this embodiment is made of PET. At the upper end of the container body 1, a flange 1f is provided that expands outward in the diameter direction. The lid 2 is made of aluminum or an aluminum alloy, but may be made of other metals.

  In this embodiment, as shown in FIG. 2, the lid 2 rises from the central portion 2m and the outer peripheral portion of the central portion 2b before the double winding, and the central portion 2b is annularly formed. There are provided a short cylindrical peripheral wall portion 2a that surrounds, and a flange portion 2f that expands outward in the diameter direction from the upper end of the peripheral wall portion 2a. The flange portion 2f before being double-clamped with a seamer is a short disk-shaped inner ring portion 2b on the side of the peripheral wall portion 2a and a bottom portion of the container body 1 extending from the outer peripheral edge of the inner ring portion 2b. It consists of a substantially cylindrical outer ring portion 2c. In order to facilitate winding, the outer ring portion 2c is narrowed inward from the middle.

  The inner diameter of the outer ring portion 2c is slightly larger than the diameter (outer diameter) of the flange 1f, and the flange 1f can enter the outer ring portion 2c of the lid 2 before double winding.

  In order to cover the container body 1 with the lid 2 and fix it, as shown in FIG. 2, the first sealant 3 is applied to the lower surface of the inner ring portion 2b, and the second sealant 4 is applied to the lower surface of the flange 1f. Apply. Then, as shown in FIG. 3, the center portion 2m of the lid 2 is pushed in from the top of the container body 1 until the inner ring portion 2b overlaps the flange 1f, and then double-tightened in the same manner as in FIG. That is, the sandwich is made by folding the outer ring portion 2c by about 90 ° so that the outer ring portion 2c wraps around the lower side of the flange 1f as shown in FIG. The shape. Next, the inner ring portion 2b, the flange 1f, and the outer ring portion 2c folded in a sandwich shape are bent by 90 ° downward in FIG. 3 so as to be along the outer peripheral surface of the container body 1. As a result, as shown in FIG. 1, the lid 2 is fixed to the container body 1.

  In this container, the space between the front side of the flange 1f and the inner ring portion 2b is sealed with the first sealant 3, and the space between the back side of the flange 1f and the outer ring portion 2c is the second sealant. Since it is sealed by 4, the sealing performance is high.

  FIG. 4 is a cross-sectional view of the same portion as FIG. 1 of a container according to another embodiment. In this embodiment, the second sealant 4 in FIG. 1 is omitted, and instead the lower end of the sandwich-like overlapped body of the inner ring portion 2b, the flange 1f and the outer ring portion 2c and the outer peripheral surface of the container body 1 The second sealant 5 is provided at the corner portion of the. That is, in the state of FIG. 2, the first sealant 3 is applied and the second sealant 4 is not applied. In this state, the inner ring portion 2b is overlapped with the flange 1f, and then the outer ring portion 2c is folded back approximately 90 ° to the back side of the flange 1f by a seamer in the same manner as in FIG. The ring portion 2c is used as a sandwich-like overlapping body, and then the sandwich-like overlapping body is bent by about 90 ° along the outer peripheral surface of the container body 1, and then the lower end of the sandwich-like overlapping body and the container body 1 The second sealing agent 5 is applied to the corner portion of the outer peripheral surface of the second sealing agent 5. Thereby, the seal structure of FIG. 4 is obtained.

  FIG. 5 is a cross-sectional view of the same part as FIG. 1 of a container according to still another embodiment. In this embodiment, the second sealing agent 4 in FIG. 1 is omitted, and instead the second sealing agent 6 is provided between the outer peripheral surface of the peripheral wall portion 2a of the lid 2 and the inner peripheral surface of the container body 1. Is provided. That is, in the state of FIG. 2, the first sealant 3 is applied to the inner ring portion 2b, and the second sealant 4 is not applied to the upper inner peripheral surface of the container body 1 or the outer peripheral surface of the peripheral wall portion 2a. Shall. In this state, the inner ring portion 2b is overlapped with the flange 1f, and then the outer ring portion 2c is folded back approximately 90 ° to the back side of the flange 1f by a seamer in the same manner as in FIG. The ring portion 2c is used as a sandwich-like overlapping body, and then the sandwich-like overlapping body is bent by about 90 ° along the outer peripheral surface of the container body 1. Thereby, the seal structure of FIG. 5 is obtained.

  Although illustration is omitted, two sealing agents, that is, the second sealing agent 4 shown in FIG. 1, the second sealing agent 5 shown in FIG. 4, and the second sealing agent 6 shown in FIG. All sealing agents may be provided. In this way, the sealing performance is further improved.

  As the sealants 3 and 4, various adhesives and sealants such as acrylate copolymers, ethylene vinyl acetate copolymers, polyolefin copolymers, and synthetic rubbers can be used, but are not limited thereto. As for the sealing agents 3, 4 and 6, any one of the above four types may be used, but for the sealing agent 5, three materials other than the synthetic rubber are suitable. Synthetic rubber is not suitable for the sealant 5 because of its high gas permeability.

  In the present invention, the flange portion 1f may be heated when the double winding is performed. FIG. 6 shows an example of a method for performing this heating. By bringing the flange portion 1f of the container body 1 into contact with the heater 10, the flange portion 1f is easily heated to about 50 to 70 ° C. Can be warmed. By doing so, for example, even when the flange portion 1f is hardened after a long time has passed since the manufacture of the container body, the flange portion 1f can be softened, and the flange portion 1f at the time of tightening Can be prevented from being damaged.

DESCRIPTION OF SYMBOLS 1 Container main body 1f Flange part 2 Lid 2f collar part 3 1st sealing agent 4-6 2nd sealing agent 10 Heater

Claims (6)

A pressure-resistant container formed by covering a metal lid on the inlet portion of a synthetic resin container main body having an outward flange at the inlet portion, and overlapping and tightening the lid and the flange. In the state before the double winding, the peripheral edge of the lid projects outward from the peripheral edge of the flange, the lid overlaps the front side of the flange, and the peripheral edge of the lid is overlapped by the double winding. In the pressure-resistant container which is folded back on the back side of the flange and is bent so that the peripheral part of the lid and the overlapping part of the flange are along the outer peripheral surface of the container main body,
A first sealant that seals between the front side of the flange and the peripheral edge of the lid;
A pressure-resistant container comprising a second sealant that seals other portions.   2. The pressure-resistant container according to claim 1, wherein the second sealing agent seals between the back side of the flange and the lid.   2. The pressure-resistant container according to claim 1, wherein the second sealant seals between the peripheral edge of the lid and the outer peripheral surface of the container main body.   2. The sealant according to claim 1, wherein the second sealing agent seals a corner portion between the end of the lid and the flange bent along the outer peripheral surface of the container main body and the outer peripheral surface of the container main body. A pressure vessel characterized by that.   In Claim 1, The said lid | cover is provided with the surrounding wall part along the inner peripheral surface of the said container main body, A said 2nd sealing agent is between the outer peripheral surface of this peripheral wall part, and the inner peripheral surface of the said container main body. A pressure-resistant container characterized by sealing.   6. The pressure-resistant container according to claim 1, wherein the pressure-resistant container is a tennis ball container in which a hard tennis ball is sealed under pressure.

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