JP2004262488A - Sealing method for container by roll-on type cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effect heat sterilization without leakage of air or a content in a container and sufficiently ensure sealing performance between a cap and the container by a liner made of a synthetic resin even after the heat-sterilization process, in a sealing method for the container by the roll-on type cap. <P>SOLUTION: This sealing method for the container seals the container by forming a threaded part on the skirt part of the cap 1 along the threaded part of the mouth part 20 by a roll-on molding, under a state wherein the cap 1 is placed and pressed onto the mouth part 20 of the container 2 filled with the content. Then, the heat-sterilization process is applied by heating at least the internal surface side of the cap of the already filled/sealed container, then, the cap 1 (or the container 2) is turned in the direction by which the screwing of the threaded part is made to advance under a state wherein the cap 1 is pinched by a capper head 33 of a cap turning device. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
In the present invention, a cap provided with a sealing liner made of a synthetic resin on the inner surface side of the top plate portion of a metal shell is placed on the mouth and neck of a container filled with contents such as a beverage and pressed from above. In the state, with respect to the sealing method of the container such that the cap is rolled on according to the shape of the mouth and neck of the container, in particular, after sealing the container by forming a screw portion on the skirt portion of the cap by roll-on molding, The present invention relates to a method for sealing a container with a roll-on cap applied when performing heat sterilization treatment on a filled and sealed container.
[0002]
[Prior art]
In a container such as a glass bottle, a synthetic resin bottle (such as a PET bottle) or a metal bottle can, a cap composed of a metal shell and a synthetic resin liner is filled with contents such as beverages. Roll-on molding by pressing the roller from the side while applying a pressing force from above over the mouth and neck of the container, and screwing the skirt of the cap along the thread formed on the mouth and neck Along the lower surface of the annular bulge formed below the threaded portion of the mouth and neck, along the radius of the lower end of the pill fur proof band formed at the lower end of the cap (below the skirt). Conventionally, it has been generally performed to seal the opening of a container with a so-called roll-on type cap which is pressed inward in a direction (for example, JP-A-56-13390, HirakiAkira 57-1092, JP-Sho 57-17785, JP-see JP 2001-270596, etc.). In addition, regarding the sealing of a container with such a roll-on type cap, it has been conventionally known that the roll-on molding method is performed twice consecutively in order to reduce the pressing load on the cap top plate during the roll-on molding. (See Japanese Patent Publication No. 61-44756).
[0003]
In a roll-on cap (a pill fur proof cap provided with a pill fur proof band) used for a container-packed product sealed by roll-on molding as described above, an inner surface of a top plate portion of the cap and an upper end of a mouth and neck portion of the container are provided. In order to ensure the sealing performance between the metal shells, a sealing liner made of a synthetic resin having elasticity is attached to the inner surface of the top plate of the metal shell. When used to manufacture a product packed in a container, depending on the contents (beverage, etc.) to be filled in the container, after sealing the container with a cap, heat sterilization may be performed at a very high temperature, In such a case, when the cap receives high heat due to the heat sterilization treatment, the synthetic resin liner attached to the inner surface side of the top plate portion of the cap is moved to the top plate portion of the metal shell. In a state where the container is pinched with a strong force between the upper end of the mouth and neck, the container softens and undergoes plastic deformation.As a result, when the container is cooled after the heat sterilization treatment, the upper end of the mouth and neck is closed. If the elasticity of the resin of the liner to be pressed is significantly reduced and the container is dropped with the cap side down, the sealing performance between the upper end of the mouth and neck of the container and the cap can be maintained. There is a risk of disappearing.
[0004]
In order to cope with such a problem, after a container (bottle) filled with a beverage or the like is sealed with a roll-on type capper by primary capping and then subjected to a retort sterilization treatment, By using the roll-on capper again by secondary capping and pressing the upper surface of the cap again, the cap is roll-on-formed once more, so that the liner provided on the inner surface of the top plate (top wall) of the cap Is pressed strongly against the upper end of the mouth and neck of the container (the upper end surface of the mouthpiece), and is brought into strong elastic contact again. It has been conventionally known from Japanese Patent Application Laid-Open No. 1-99989 that the sealability between the cap and the container can be ensured by processing into a shape conforming to the above.
[0005]
[Problems to be solved by the invention]
By the way, in a conventionally known method as disclosed in the above-mentioned JP-A-1-99989, in roll-on molding by primary capping, a skirt of a cap is formed along a threaded portion formed on the mouth and neck of a container. At the same time as forming the threaded part, the lower end side of the pill fur proof band formed below the skirt part, along the lower surface of the annular bulge formed below the screw part of the mouth and neck, in the radial direction The cap is pressed inward, and after the heat treatment (retort treatment), the cap is pressed again from above by roll-on molding with secondary capping after the roll-on molding. In this state, the screw portion of the cap is re-formed and the lower end of the pill fur proof band is pressed inward in the radial direction.
[0006]
According to such a conventionally known method, during roll-on molding in secondary capping, by pressing the cap from above, the synthetic material existing between the top plate portion of the cap and the upper end of the mouth and neck of the container is pressed. The resin-made liner is strongly pressed against the upper end of the mouth and neck of the container so as to be elastically compressed by the pressing force from above, and strongly and elastically against the top plate of the cap and the upper end of the mouth and neck of the container. It is necessary to return to the pressed state, but in order to do so, the top plate of the cap needs to be able to move slightly downward with respect to the upper end of the mouth and neck of the container.
[0007]
However, the screw portion is already formed on the skirt portion of the cap by primary capping, while the screw portion having a shape matching this screw portion is naturally present at the mouth and neck of the container. If the part is formed to a depth that can be securely screwed into the screw part of the mouth and neck, the lower surface side of the screw part of the already formed cap (the thread of the female screw that projects inward in the radial direction) The lower surface) contacts the upper surface of the screw at the mouth and neck of the container (the upper surface of the thread of the male screw that protrudes outward in the radial direction), and the cap does not move below it. If you try to reshape the screw part by shifting it slightly higher than the screw part already formed by roll-on molding, it will not be possible to shift such a position and form a new screw part with a normal shape (Forcibly An attempt, threaded portion became threaded portion and the mismatch neck will be formed).
[0008]
In addition, at the time of roll-on molding in the primary capping, the screw portion to be formed on the skirt portion of the cap is formed so that the screw root is considerably shallower than the shape of the screw portion formed on the mouth and neck of the container. In other words, the cap skirt part shrinks slightly in the height direction by re-forming the screw part of the cap deeply in the secondary capping, so that the top plate part of the cap is slightly However, if the screw portion is formed shallowly in the skirt portion of the cap, since the screwing between the mouth and neck portion of the container and the cap becomes loose, for example, During retort sterilization after capping, when the pressure inside the container rises due to the thermal expansion of the beverage and gas in the container, the top plate of the cap is lifted by the pressure. Te, the contact pressure of the liner material is pressed against the neck top edge of the container is weakened, and as a result, the is a possibility that gas or beverage in the container from leaking occurs.
[0009]
In particular, in the case of a beverage can using a bottle-shaped can made of an aluminum alloy plate having a thinner body, after filling the beverage to prevent the body from being deformed (dented) by external pressure, Since liquid nitrogen is added to the can to make positive pressure cans with high can internal pressure, when such beverage cans are retort-sterilized, the internal pressure of the can becomes considerably high during the retort sterilization treatment, and the If the screwed state between the neck and the cap is not ensured, there is a problem that the possibility that the beverage leaks from the space between the mouth and neck of the container and the cap increases accordingly.
[0010]
An object of the present invention is to solve the above-described problems. Specifically, a method for sealing a container with a roll-on type cap is performed by heat sterilization without leaking air or contents in the container. An object of the present invention is to make it possible to ensure sufficient sealing between a cap and a container by a synthetic resin liner even after heat sterilization by simple means.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a metal shell in which a skirt portion is suspended substantially in a cylindrical shape from a periphery of a top plate portion, and a pill fur proof band is formed below the skirt portion, and A cap made of a synthetic resin sealing liner attached to the inner surface of the top plate portion is placed on the mouth and neck of the container filled with the contents and pressed from above, and formed on the mouth and neck. In a container sealing method in which the skirt portion of the cap is rolled on in accordance with the screw portion and the annular bulge portion thereunder, the cap is placed over the mouth and neck of the container filled with the contents, and In the pressed state, the container is sealed by forming a screw portion on the skirt portion of the cap along the screw portion of the mouth and neck by roll-on molding, and then heating at least the inner surface side of the cap of the filled and sealed container. Add Was subjected to sterilization treatment, further, at least one of the cap and the container, is characterized in that so as to rotate in the direction in which the screwing of both the threaded portion proceeds.
[0012]
According to the above configuration, by securely screwing the mouth and neck of the container and the cap in the roll-on molding before performing the heat sterilization treatment, the air and the contents in the container when the heat sterilization treatment is performed. Nothing leaks. In addition, even though the heat sterilization treatment (including the subsequent cooling step) significantly reduces the elasticity of the resin of the liner pressed against the upper end of the mouth and neck, the screwing between the mouth and neck of the container and the cap is further advanced ( By tightening), the liner can be strongly pressed again between the top plate of the cap and the upper end of the mouth and neck of the container, and the liner can be strongly pressed against the upper end of the mouth and neck of the container. As a result, In addition, the sealing performance between the cap and the container can be sufficiently ensured.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a method for sealing a container using a roll-on cap of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the method of the present invention in which a cap is attached to the mouth and neck of a container in a finally manufactured product, and FIG. 2 shows a state in which the contents are filled. FIG. 3 shows a state in which a screw portion is formed on a skirt portion of the cap by roll-on molding in a state where the cap is placed on the mouth and neck of the container and pressed from above, and FIG. After applying, the cap is rotated in the screwing direction (tightening direction), and then the lower end side of the pill fur proof band is pushed inward in the radial direction to perform molding.
[0014]
The container used in the method of the present embodiment is made of, for example, a resin-coated metal plate material such as an aluminum alloy plate having a protective film of a polyester film heat-sealed on both sides, and a neck, a shoulder, and a body. The part is integrally formed, and a bottom lid of a separate body is fixedly fastened to the lower end of the body part by a bottle-shaped metal can. As shown in FIG. An outer curl portion 21 is formed in a ring shape along the upper end opening edge, a screw portion 22 is formed in a skirt portion below the ring portion, and an annular bulging portion 23 is formed below the screw portion 22. . The container to be used is not limited to the above-mentioned metal bottle-shaped can, but may be any suitable container having a threaded mouth and neck portion, such as a glass bottle or a synthetic resin bottle (PET bottle, etc.). It may be.
[0015]
Further, the cap 1 used in the method of the present embodiment comprises a metal shell 10 and a sealing liner 11 made of synthetic resin, and a pill fur proof band from which a lower end portion of the metal shell 10 can be separated. 13 is a so-called pill fur proof cap, not shown, but in a state before being attached to the mouth and neck of the container, the metal shell is positioned from the periphery of the disc-shaped top plate. A cylindrical skirt is hung down. A pill fur proof band is formed below the cylindrical skirt so as to be detachable. The pill fur proof band is formed on the inner surface (lower surface) of the top plate of the shell. A resin liner is integrally provided.
[0016]
The materials of the shell 10 and the liner 11 of the cap are not particularly limited. For example, the shell 10 is coated with an epoxy-phenol resin in which an olefin-based resin powder is dispersed on the inner surface side. A conventionally known metal material for a cap such as an aluminum alloy plate is used. For the liner 11, for example, a blend material of low-density polyethylene and an ethylene-propylene copolymer elastomer or polypropylene and a styrene-based elastomer A well-known embossing method in which a synthetic resin material for a liner such as a blend material or a polyester elastomer is used, and the synthetic resin is extruded in a molten state on the inner surface side of the top plate and embossed. Etc.
[0017]
In a state where the cap 1 including the metal shell 10 and the synthetic resin liner 11 is finally mounted on the mouth and neck portion 20 of the container 2 by roll-on molding, as shown in FIG. Corresponding to the curled portion 21, the screw portion 22, and the annular bulged portion 23 formed in this order from the top on the mouth and neck portion 20, the skirt portion of the cap 1 (shell 10) has the mouth and neck portion 20. The screw portion 12 is formed so as to match (screw-fit) with the screw portion 22 of the pill fur proof band 13. It is pushed towards. The liner 11 made of synthetic resin is strongly sandwiched between the top plate of the cap 1 (shell 10) and the curled portion 21 at the upper end of the mouth-neck portion 20, and the curled portion 21 at the upper end of the mouth-neck portion 20. , So that the sealing between the cap 1 and the container 2 is sufficiently ensured.
[0018]
By the way, in the method of this embodiment for sealing the container with the roll-on cap, after the content is filled in the container and sealed, the filled and sealed container (canned) is heated at a high temperature. Even when a sterilization treatment (and a subsequent cooling step) is performed, the container is sealed so that the state in which the sealing property is sufficiently ensured as described above can be maintained. The method will be described below.
[0019]
In the method of this embodiment, a bottle-shaped can made of an aluminum alloy plate is used as a container, and a beverage (milk coffee, milk tea, milk cocoa, milkshake, soy milk, soup beverage, etc.) heated to a temperature of about 70 to 90 ° C. ), Liquid nitrogen is added to the head space of the container to further increase the internal pressure of the can and to prevent oxidation of the beverage, so that the container filled with the beverage (bottle type can) With regard to (1), the opening of the container is sealed with a roll-on cap.
[0020]
That is, a container (bottle type can) filled with contents (beverage) and added with liquid nitrogen (preferably, nitrogen gas is blown into the head space of the container to expel air in the head space and then liquid nitrogen is added). 2), first, as shown in FIG. 2, a pill fur proof cap 1 composed of a metal shell and a synthetic resin liner is placed on the mouth and neck 20 of the container 2 and a pressure 31 and a screw roller 32 are attached. Using a roll-on type capper equipped with the above, the screw roller 32 is brought close to the cylindrical skirt portion of the cap 1 from the side while the top plate portion of the cap 1 is pressed from above by the pressure 31, By pressing the skirt portion of the cap 1 against the mouth and neck portion 20 of the container 2 with the screw roller 32, the screw portion 22 formed on the mouth and neck portion 20 is formed. And molding the threaded portion 12 to the skirt portion of the cap 1 along. In the present embodiment, in the roll-on molding at this time, the lower end side of the pill fur proof band 13 is pressed inward in the radial direction along the lower surface of the annular bulging portion 23 of the mouth and neck portion 20 of the container 2. I haven't.
[0021]
In the method of the present embodiment, a container (bottle-type can) in which the cap 1 is attached to the mouth and neck portion 20 of the container 2 by forming the screw portion 12 on the cap 1 by roll-on molding as described above is illustrated. Although not filled, the filled and sealed container (canned product) is carried into a retort pot, subjected to a heat and pressure sterilization treatment at 125 ° C. for 25 minutes, and then cooled water is introduced into the retort pot to about 40 ° C. After being cooled down, it is taken out of the retort pot and transported to a position below the cap rotating device.
[0022]
Then, as shown in FIG. 3, first, the capper head 33 of the cap rotating device is lowered (or the container 2) is subjected to the heat sterilization treatment (and the subsequent cooling step). Is raised), the capper head 33 is put on the cap 1 from above, and then, with the cap 1 held between the capper head 33 and the cap and head 33, the direction in which the screwing of the mouth-neck portion 20 and the cap 1 proceeds with a predetermined torque. The cap 1 (or the container 2) is rotated in the (tightening direction). When the cap 1 (or the container 2) is rotated in a direction in which the screwing proceeds (tightening direction) with a predetermined torque by the cap rotating device, the cap 1 after the retort sterilization treatment is usually rotated about 30 to 90 degrees. As a result, the relative position of the cap 1 with respect to the mouth and neck 20 is also lowered accordingly.
[0023]
After the cap 1 is sufficiently screwed (tightened) to the mouth and neck portion 20 as described above, the pressure is further increased by using a roll-on type capper having a pressure 31 and a skirt roller (tightening roller) 34. A skirt roller (tightening roller) 34 is pressed against the lower end side of the pill fur proof band 13 while pressing the top plate portion of the cap 1 from above with the 31, so that the lower end side of the pill fur proof band 13 is moved to the mouth and neck portion 20. The cap 1 is fixed to the mouth and neck portion 20 by pushing inward in the radial direction along the lower surface of the annular bulging portion 23. The roll-on type capper used in the present embodiment is a diversion of the one conventionally used. In roll-on molding before the heat sterilization treatment, the skirt roller 34 is removed and used, and the heat sterilization is performed. In the roll-on molding after the treatment, the screw roller 132 is used after being removed.
[0024]
According to the container sealing method using the roll-on cap of the present embodiment as described above, the screw portion 12 is rolled on the skirt portion of the cap 1 in the roll-on molding before performing the heat sterilization treatment, and the opening of the container 2 is opened. By securely screwing the neck 20 and the cap 1, it is possible to prevent the air and contents in the container from leaking when the filled and sealed container is subjected to heat sterilization.
[0025]
Further, even if the elasticity of the synthetic resin of the liner 11 pressed against the upper end (curled portion 21) of the mouth and neck portion 20 is significantly reduced by the heat sterilization treatment (including the subsequent cooling step), the mouth and neck portion 20 and the cap 1 is further pressed (tightened) to strongly press the liner 11 again between the top plate portion of the cap 1 (shell 10) and the upper end (curled portion 21) of the mouth and neck portion 20 to thereby close the mouth and neck. The liner can be strongly pressed against the upper end (curled portion 21) of the portion 20. As a result, the sealing property of the liner 11 reduced by the heat sterilization treatment is restored to a good state, and even if the container receives a drop impact, the upper end (curl portion 21) of the mouth and neck 20 and the cap are closed. There is almost no danger that the contents or air will leak from between them.
[0026]
In the method of the present embodiment, the liner 11 is strongly pressed between the top plate portion of the cap 1 (shell 10) and the upper end (curled portion 21) of the mouth and neck portion 20 after the heat sterilization treatment. The cap 1 (or the container 2) is simply moved in the direction in which the screw portion 22 of the mouth / neck portion 20 and the screw portion 12 of the cap 1 are advanced (tightened) without forcibly reshaping the screw portion on the cap. ) Is simply rotated, the operation for that can be performed smoothly and without difficulty, and there is no danger of deforming the cap 1 itself.
[0027]
Further, according to the method of the present embodiment, after the heat sterilization treatment is performed, the screwing between the mouth and neck portion 20 and the cap 1 is further advanced, so that the sealing property of the liner 11 is restored to a good state. By pressing the lower end side of the pill fur proof band 13 inwardly in the radial direction along the lower surface of the annular bulging portion 23 of the mouth and neck portion 10, the containers come into contact with each other or the container Even if the cap 1 is vibrated in contact with an object, the cap 1 does not rotate in the loosening (unscrew) direction while the sealing performance of the liner 11 is well maintained. As a result, it is possible to reliably maintain the good sealing property of the liner 11 until the pill fur proof band 13 is cut off by opening, and it is possible to reliably prevent the contents from leaking before opening.
[0028]
In addition, in the method of this embodiment, at the time of roll-on molding before performing the heat sterilization treatment, only the screw portion 12 is formed on the skirt portion of the cap 1, and the pill fur proof band 13 is not particularly roll-on molded, Although the lower end side of the pill fur proof band 13 is not pressed and molded inward in the radial direction along the lower surface of the annular bulging portion 23 of the mouth and neck portion 20, at the time of roll-on molding before performing the heat sterilization treatment, At the same time as the screw portion 12 is formed on the skirt portion of the cap 1, the lower end side of the pill fur proof band 13 is pressed inward in the radial direction and subjected to a heat sterilization treatment. After turning at least one of the cap 1 and the container 2 in a direction to further advance the joining, the lower end side of the pill fur proof band 13 is It may be re-formed so as to be pushed inward. In such a case, when the container is conveyed for heat sterilization treatment or heat sterilization treatment, the mouth-neck portion 20 and the cap 1 are closed. The risk of loosening can be completely eliminated.
[0029]
As described above, an embodiment of the method for sealing a container by the roll-on cap of the present invention has been described. However, the method of the present invention is not limited to the above-described embodiment, and can be appropriately changed. For example, in the above-described embodiment, the liquid nitrogen is added at the time of filling using a bottle-type can made of an aluminum alloy whose body is thinned, but the bottle-type can is made of a highly rigid surface-treated steel plate. In addition, by making the body thicker than in the case of ordinary bottle-type cans, the body wall is not dented even when the can internal pressure is negative pressure (pressure lower than atmospheric pressure). Then, it is not necessary to add liquid nitrogen at the time of filling, and the container to be used is not limited to a metal bottle can, but may be another container such as a glass bottle or a resin bottle.
[0030]
In addition, the heat sterilization treatment is not limited to the retort sterilization method. For example, after filling the container with the content of 80 ° C. or higher and sealing the container, the container is placed in an inverted or horizontal state and brought into contact with the hot content. In this way, the inner surface of the container is heated and sterilized by heating and sterilizing the inner surface of the cap by maintaining the inner surface of the cap at a temperature of 80 ° C. or higher for a predetermined time or longer (the inner surface of the container is also heated and sterilized by the hot filling method). After sufficient time has passed, cooling water or the like is sprayed on the outer surface side to cool the temperature of the container and the beverage in the container to a temperature of about 25 to 40 ° C.) Without employing such a hot filling method, the beverage is filled in the container and sealed with a cap, and then the container is heated with hot water at a temperature of 60 to 95 ° C. to sterilize the container and the beverage. Or any other appropriate heat sterilization method. It is capable practiced by use.
[0031]
【The invention's effect】
According to the method for sealing a container with the roll-on type cap of the present invention as described above, by securely screwing the container and the cap in the roll-on molding before performing the heat sterilization treatment, the air and contents in the container are The container can be heat-sterilized without causing any leakage. In addition, even if the elasticity of the synthetic resin of the liner pressed against the upper end of the mouth and neck of the container is significantly reduced by the heat sterilization treatment, the screwing between the mouth and neck of the container and the cap is further advanced (tightened). The liner can be strongly pressed against the upper end of the mouth and neck of the container again by a simple means without deforming the cap, and the sealing performance between the cap and the container can be sufficiently ensured.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which a cap is attached to a mouth and neck of a container in a finally manufactured product in one embodiment of a method for sealing a container with a roll-on cap according to the present invention.
FIG. 2 is an explanatory longitudinal sectional view showing a state where a screw portion is formed on a skirt portion of a cap by roll-on molding in a state where a cap is placed on a mouth and neck portion of a container filled with contents and pressed from above.
[FIG. 3] After performing heat sterilization on a filled and sealed container, the cap is turned in the screwing direction (tightening direction), and then the lower end side of the pill fur proof band is turned inward in the radial direction. FIG. 4 is an explanatory longitudinal sectional view showing a state at the time of press molding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cap 2 Container 10 Shell (of cap) 11 Liner (of cap) 12 Thread portion (of cap) 13 Pill fur proof band (of cap) 20 Neck 21 (of container) Curl (upper end of neck and neck)
22 Screw part (of the mouth and neck) 23 Annular bulge (of the mouth and neck)

Claims (5)

A metal shell with a pillow proof band formed below the skirt with the skirt hanging down from the periphery of the top plate in a substantially cylindrical shape, and a synthetic resin sealing attached to the inner surface of the top plate In a state where the cap made of the liner is put on the mouth and neck of the container filled with the contents and pressed from above, the screw is formed on the mouth and neck and the annular bulging portion below the screw is formed. In a method of sealing a container such that the skirt portion of the cap is rolled on, in a state where the cap is placed on the mouth and neck of the container filled with the contents and pressed from above, the screw portion of the mouth and neck is formed by roll-on molding. After sealing the container by forming a screw portion on the skirt portion of the cap along with heating and sterilizing by heating at least the inner surface side of the cap of the filled and sealed container, the cap and the container are further sealed. One a sealing method for containers according roll-on cap which is characterized in that so as to rotate in the direction of screwing progresses of both the threaded portion even without. After performing the heat sterilization treatment, at least one of the cap and the container is rotated in a direction in which the screwing of the two screw portions proceeds, and then along the lower surface of the annular bulge formed in the mouth and neck. 2. A method for sealing a container with a roll-on cap according to claim 1, wherein the lower end side of the pill fur proof band is pressed inward in the radial direction. At the time of roll-on molding before heat sterilization treatment, at the same time as forming a screw part on the skirt part of the cap, along the lower surface of the annular bulge formed on the mouth and neck part, the lower end side of the pill fur proof band is radiused After pressing and molding inward in the direction and performing heat sterilization treatment, at least one of the cap and the container is rotated in a direction in which the screwing of the two screw portions proceeds, and then the lower end side of the pill fur proof band is turned. The method for sealing a container with a roll-on cap according to claim 1, wherein the container is reshaped so as to be pushed inward in the radial direction. The method for sealing a container with a roll-on cap according to any one of claims 1 to 3, wherein the heat sterilization treatment is a retort sterilization method in which the entire container is housed in a retort device. Heat disinfection, filling the container with the contents of 80 ° C or higher and sealing it, and then placing the container in a horizontal or inverted state to maintain the inner surface of the cap at a temperature of 80 ° C or higher for a predetermined time or more. A method for sealing a container with a roll-on type cap according to any one of claims 1 to 3, wherein the container is sealed.

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