JP2013082488A - Container with metal cap and method of molding the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container with a metal cap in which sealability of the container is prevented from deteriorating before an annular member to be broken off from the cap is separated according to opening operation of the unopened container, and a method of molding the same.SOLUTION: In the container 1 in which whether the cap 20 screwed to an opening neck part 10a of a container body 10 is unopened is visible from the outside, before a tamper evidence band 26 to be separated from the cap 20 by breakage of a bridge 25 is separated according to opening operation of the unopened cap 20, an outer projection part 22c is pressed in the radially inner direction by a recessed part 24d so that close attachment between a liner 22 provided on the inner face side of the cap 20 and an opening end of the container body 10 is not released.

Description

  The present invention relates to a container for storing fluid contents, and more particularly to a metal container provided with a metal cap having a structure that can be visually recognized as an unopened container, and a forming method thereof.

  Conventionally, whether or not an unopened cap is attached to a container that can be opened and closed repeatedly, such as a synthetic resin cap or a metal cap, with food and drink as contents, in particular. As can be judged visually, an annular member that is separated from the cap by breaking the portion connected to the cap skirt through the bridge when the container is opened, a so-called tamper evidence band (hereinafter referred to as "TE band") .) Are widely known. As a result, it is possible to easily recognize and discriminate whether the cap attached to the container has been opened once or whether an unopened cap has been attached.

  As a method of capping a metal cap provided with the TE band, a cap is put on a container mouth portion having a screw portion on its outer peripheral surface, and a screw portion is formed on the skirt portion of the cap by roll-on molding. It is known that the TE band formed at the lower end of the part is locked to the lower part of the container mouth.

  The TE band is used to indicate that the cap has been opened by breaking the bridge connecting the skirt portion to the skirt portion, whereas the sealed state of the container is the inner surface of the cap, particularly the cap. It is maintained by the liner provided on the inner surface being in close contact with the mouth of the container. That is, the amount of rise of the cap required for breaking the bridge is not directly related to the amount of rise of the cap required for the liner to move away from the mouth. For this reason, if the amount of lift of the cap required for the TE band to break at the bridge portion is large, the liner is slightly opened away from the mouth even if the TE band does not break at the bridge portion. Or the sealed state may be released.

  Conventionally, various containers configured to maintain the sealed state of the container until the bridge breaks are known. For example, Japanese Patent Laid-Open No. 2004-228561 has an inner side in which a liner is provided on the inner side of the container lid, and the lower end of the outer ring of the liner is in contact with the lower end of the curled part so as to protrude inward from the outer peripheral edge of the curled part of the container mouth part. A container with a protrusion is disclosed. As a manufacturing method of this container, in a metal container lid with a liner attached to the mouth of a metal container, the corner portion extending from the top wall to the skirt wall is drawn while pressing the container lid from above, thereby forming the liner. It is described that an inward projecting portion is formed by projecting the lower end of the outer ring inwardly from the outer peripheral edge of the curled portion. The inward protruding portion is brought into close contact with the outer side surface of the curled portion of the container mouth portion, thereby preventing the sealed state of the container from being released prior to the break of the bridge.

  Further, in Patent Document 2, the cap material molding roller is inclined and abutted against the outer peripheral edge portion of the top plate portion so that the screw shape of the container or the mouth portion is not buckled by the pressing force in the axial direction. It is described that the step portion is formed by this. Further, after forming the temporary stepped portion by the pressing force in the axial direction, the shoulder portion is pressed by the inclined roller to form the stepped portion, or the outer peripheral edge portion of the cap material protruding in the axial direction, the liner, and the container opening It is described that the roller is brought into contact with the outer peripheral portion of the cap member in the horizontal direction so that the portion including the portion is sandwiched between the end portion of the pressure block and the roller.

JP 2008-74440 A JP 2004-210403 A

  However, in the invention described in Patent Document 1 described above, the corner portion of the cap or the vicinity thereof is pressed downward similarly to the load for pressing the cap against the mouth portion of the container at the time of roll-on capping. It is comprised so that the contact | adherence area | region of the liner with respect to may be increased. That is, most of the molding load in that case is directed toward the axial direction of the cap. Therefore, there is a possibility that the inward protruding portion described in Patent Document 1 cannot be sufficiently formed, and there is a possibility that the sealed state of the container is released before the bridge breaks and the TE band is separated.

  Moreover, in the shaping | molding method of patent document 2, although the load of the axial direction to a bottle can is reduced and the buckling is prevented by applying a load from the direction which cross | intersects with respect to the axial direction of a bottle can. Since a step portion is formed as a whole from the upper end of the shoulder portion of the cap material to a position adjacent to the lower portion of the curl portion, a large load is applied in the direction intersecting the axial direction this time. There was a risk that the sealing performance would be impaired.

  Furthermore, it is not necessary to continue to strengthen the adhesion between the container mouth and the liner in order to ensure the tightness inside the container. For those who open the cap, it does not require a rotational force stronger than necessary. It is desirable that the container be openable.

  Therefore, the present invention has been made paying attention to the above-mentioned technical problems, and can be molded without incurring the complexity and complexity of the process of attaching the cap to the container. Accordingly, it is an object of the present invention to provide a container with a metal cap that can ensure the sealing performance in the container until the annular member to be broken from the cap is separated, and a molding method thereof.

  In order to solve the above-described problems of the prior art, the invention according to claim 1 includes a container main body having a mouth and neck portion in which a mouth portion which is an open end and a tubular neck portion are integrated, and the opening end. A top plate portion having a liner on the inner surface side as a sealing member that comes into close contact with and a skirt portion formed with a screw portion that hangs down from the peripheral portion of the top plate portion and is screwed to the outer peripheral surface of the neck portion; In the container with a metal cap having a metal cap, the resin liner is disposed so as to be in close contact with at least the outer peripheral side wall of the mouth portion, and the cap has the peripheral portion at the skirt portion. Between the threaded portion and an annular recess recessed inward in the radial direction so as to press the liner against the outer peripheral side wall, and the concave portion makes the liner closely contact with the outer peripheral side wall. Characterize Than is.

  According to a second aspect of the invention, in addition to the configuration of the first aspect, an outer peripheral side wall of the mouth portion includes an outer peripheral side surface formed in a straight line in a longitudinal section, and the liner includes at least the outer peripheral side of the outer peripheral side wall. A container with a metal cap, wherein the container is disposed so as to be in close contact with a side surface, and is in close contact with and in contact with at least the outer peripheral side surface by the concave portion.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the liner is in close contact with and in contact with the outer peripheral lower surface of the outer peripheral side wall formed in a curved shape in the longitudinal section by the concave portion. A container with a metal cap.

  In order to solve the above-mentioned problems of the prior art, the invention according to claim 4 includes a container main body having a mouth-neck portion in which a mouth portion that is an open end and a cylindrical neck portion are integrated, and the open end. A top plate portion having a liner on the inner surface side as a sealing member that comes into close contact with and a skirt portion formed with a screw portion that hangs down from the peripheral portion of the top plate portion and is screwed to the outer peripheral surface of the neck portion; And a metal cap having a metal cap, wherein the container is in close contact with the outer peripheral side wall of the mouth portion between a peripheral portion of the top plate portion and the screw portion in the skirt portion. The container in a direction orthogonal to the axial direction of the container body so that an annular recess recessed inward in the radial direction that presses the liner made of resin disposed on the outer peripheral side wall is formed. The above-mentioned catheter attached to the mouth and neck of the main body. From the outer surface side of the up, the load applied by the forming roller is characterized in that the action on the cap.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the outer peripheral side wall of the mouth portion is formed in a linear shape in a longitudinal section, and the outer peripheral lower surface formed in a curved shape in the longitudinal section. The liner disposed in close contact with at least the outer peripheral side surface of the outer peripheral side wall in close contact with the outer peripheral side surface, and the lower end of the liner in close contact with the outer peripheral lower surface In this way, the concave portion to be pushed inward in the radial direction is formed.

  According to a sixth aspect of the present invention, in addition to the configuration of the fourth or fifth aspect, the molding roller having a molding torque of 1 N · m or more and 4 N · m or less causes a molding load to act in a direction perpendicular to the axial direction. A method of forming a container with a metal cap, wherein a recess is formed.

  According to the first aspect of the present invention, since the concave portion formed in the cap is brought into close contact with the liner as it presses against the mouth which is the open end, the sealing performance of the container can be ensured even during the opening operation. Further, it is possible to reliably prevent the sealing performance of the container from being impaired before the annular member is separated from the cap after the skirt portion and the annular member start to break. Furthermore, only the process of forming the recess in the cap that is attached to the mouth and neck of the container body can be introduced into the production line without the complexity of the capping process, the increase in size of the apparatus, and the addition of equipment.

  According to the second aspect of the present invention, the portion where the liner adheres in order to maintain the hermeticity of the container is the outer peripheral side surface with a straight vertical section, so the cap is swung with a constant rotational force to open the cap. Can be made. Further, when the cap moves in the axial direction in accordance with the opening operation, the tight adhesion of the liner that is brought into close contact with the concave portion can be kept constant, so that the sealing performance of the container can be kept constant. .

  According to invention of Claim 3, since the lower end of a liner closely_contact | adheres to the outer peripheral lower surface of an opening | mouth part, a liner and an opening | mouth part can be closely_contact | adhered so that it may wrap around from a linear outer peripheral side surface, and a sealing performance can be improved. In addition, since the lower end portion of the liner protrudes inward in the radial direction of the container, when the cap is raised in the axial direction according to the opening operation, the liner and the outer peripheral side surface of the mouth portion are in close contact with each other Can be reliably continued, the adhesion can be improved, and the sealing performance in the container can be sufficiently ensured until the TE band is separated.

  According to the invention of claim 4, the container in which the concave portion formed so that the concave portion formed in the cap is brought into close contact with the mouth which is the opening end is sealed even during the opening operation. Can be secured. In addition, the container in which the recess is formed can reliably prevent the sealing performance of the container from being impaired before the annular member is separated from the cap after the skirt portion and the annular member start to break. Furthermore, only the process of forming the recess in the cap that is attached to the mouth and neck of the container body can be introduced into the production line without the complexity of the capping process, the increase in size of the apparatus, and the addition of equipment.

  According to the invention of claim 5, in the container in which the concave portion is formed, the portion where the liner is in close contact with the container in order to maintain the sealing performance is the outer peripheral side surface having a straight vertical section, so that the cap is fixed with a constant rotational force. Can be swung and opened. Further, when the cap moves in the axial direction in accordance with the opening operation, the tight adhesion of the liner that is brought into close contact with the concave portion can be kept constant, so that the sealing performance of the container can be kept constant. . Furthermore, the sealability of the container can be improved by pushing the liner so as to come into contact with the outer peripheral lower surface of the curled portion.

  According to the invention of claim 6, the concave portion is formed by a forming roller having a forming torque of 1 N · m or more and 4 N · m or less, so that the liner is inserted into the mouth portion without excessive damage to the skirt portion or liner of the cap. Can be adhered to.

It is the side view and partial side sectional view which showed typically the embodiment of the container which concerns on this invention. (A) is side sectional drawing which showed typically the contact | adherence state of the container main body and the cap in the opening end of a container main body, (b) is side sectional drawing of the curl part which forms the opening end of a container main body. . It is the figure which showed the positional relationship of the container at the time of shape | molding a recessed part with a capping apparatus, and its shaping | molding roller. It is the schematic diagram which expanded the contact state of the container at the time of shape | molding the recessed part, and a forming roller, and showed the positional relationship.

  The present invention will be described based on specific examples. The container according to the present invention is a container in which whether or not the cap to be screwed and connected to the container body is unopened can be visually confirmed, and in particular, an annular shape that is broken from the cap according to the opening operation of the unopened cap Prior to the separation of the member from the cap, the close contact between the sealing member provided inside the cap and the open end of the container body is not released. Further, in the container molding method according to the present invention, the outer peripheral side wall and the sealing member at the opening end of the container main body can ensure a sealed state in the container according to the opening operation of the cap so as to be the container described above. A concave portion is formed on the cap by roll-on molding.

  FIG. 1 is a side view and a partial side cross-sectional view schematically showing an embodiment of a container according to the present invention. The container 1 includes a container body 10 having an opening and neck portion 10a that forms an open end, and a cap 20 for sealing the opening and closing portion 10a that forms the opening end, and is an unopened container. Provided with a tamper evidence band (hereinafter referred to as “TE band”) 26.

  The container body 10 has a closed bottom portion 10c integrated with one end of a cylindrical body portion 10b, and a mouth neck portion 10a integrated with the other end, and the mouth neck portion 10a has an opening. The mouth part which is an end and the neck part to which the cap 20 is screwed are included. That is, the container body 10 is provided with a mouth and neck portion 10a including a mouth portion that is partially opened, and the mouth portion is sealed by the cap 20, whereby the container body 10 is sealed and accommodates contents. is there. Moreover, the container main body 10 is shape | molded from metal materials, such as an aluminum alloy and a surface treatment steel plate.

  Specifically, the mouth-and-neck portion 10a is a cylindrical neck portion extending upward from the trunk portion 10b, and an opening end formed at the upper end of the neck portion, and also an opening end of the container body 10. Including the mouth. The mouth and neck portion 10a is to be fitted with a cap 20, and the neck portion prevents the screw portion 12 screwed into the screw portion 24a formed on the cap 20 and the TE band 26 from moving upward. In order to do so, it has a step-shaped jaw 13 bulging outward in the radial direction. The mouth portion has a curled portion 11 in which an end portion of a metal plate forming the neck portion is bent outward from the container. In addition, the curl part 11 illustrated in each drawing is bent fourfold.

  The curled portion 11 will be specifically described with reference to FIG. FIG. 2 is a side cross-sectional view showing a close contact state between the curl portion 11 forming the mouth portion serving as the opening end and the liner 22 pushed in by the concave portion 24d. The curled portion 11 forms the upper end portion of the mouth-and-neck portion 10a, and the end portion of the metal plate that extends from the neck portion to the outside of the container is bent so that the upper end of the cylindrical neck portion becomes the open end. Is. That is, the mouth portion is an open end formed by the curled portion 11 formed in an annular shape, and the curled portion 11 is disposed outward from the inner peripheral side wall of the neck portion in the radial direction. Therefore, the curled portion 11 constitutes a surface portion in the mouth-and-neck portion 10a, and a top portion 11a that is the upper end of the curled portion 11 in the axial direction is formed, and a metal plate that is bent outward from the top portion 11a in the radial direction. Of these, the outer peripheral side wall 11c is formed in the portion constituting the surface portion.

  The outer peripheral side wall 11 c includes a lower end portion 11 b that is a lower end of the curled portion 11. In addition, an inner peripheral side wall 11g is formed inward in the radial direction from the top portion 11a, that is, in a portion forming the inner periphery of the mouth. In other words, the curled portion 11 that is a mouth portion formed by the end portion of the metal plate extending from the neck portion continues to the inner peripheral side wall 11g that forms the inner peripheral portion of the open end toward the end of the metal plate. It can also be said that the top portion 11a that forms the upper end portion of the mouth portion, the outer peripheral side wall 11c that forms the surface of the outer peripheral portion of the curled portion 11, and the lower end portion 11b that forms the lower end portion of the curled portion 11 are formed in this order. In this embodiment, the outer peripheral side wall 11c of the curled portion 11 forms an outer peripheral portion of the mouth that is an open end, and is particularly a portion formed between the top portion 11a and the lower end portion 11b.

  Moreover, the outer peripheral side wall 11c has the outer peripheral side surface 11d which forms the surface part formed linearly in the longitudinal cross section. The outer peripheral side surface 11d is in contact with the outer protrusion 22c of the liner 22 in close contact. That is, the outer peripheral side surface 11d of the curled portion 11 and the outer protrusion portion 22c of the liner are in close contact with each other, so that the container 1 can be sealed and maintained in a sealed state.

  The outer peripheral side wall 11c has an outer peripheral upper surface 11e and an outer peripheral lower surface 11f in addition to the outer peripheral side surface 11d. The outer peripheral upper surface 11e is formed between the top portion 11a of the curled portion 11 and the outer peripheral side surface 11d, and is formed in a curved shape in a longitudinal section as exemplified in FIG. The outer peripheral lower surface 11f is formed between the lower end portion 11b of the curled portion 11 and the outer peripheral side surface 11d, and is formed so that the longitudinal section thereof is curved like the outer peripheral upper surface 11e. That is, the outer peripheral upper surface 11e, the outer peripheral side surface 11d, and the outer peripheral lower surface 11f are formed in this order so that the vertical cross section from the top portion 11a to the lower end portion 11b is in the order of a curve, a straight line, and a curve. In addition, the line segment in the cross-sectional linear shape of this outer peripheral side surface 11d may be formed in the linear line segment parallel to the axial direction in the container main body 10. FIG.

  The cap 20 includes a metal top plate portion 23 and a skirt portion 24, and a synthetic resin liner 22 that seals the open end of the container body 10. The metal top plate portion 23 and the skirt portion 24 are made of a known metal material for a cap, such as an aluminum alloy or a surface-treated steel plate. The synthetic resin liner 22 is made of a resin material such as an olefin resin, a polyester resin, a styrene resin, or an acrylic resin.

  A skirt portion 24 is formed on the cap 20 so as to hang from the peripheral edge portion of the top plate portion 23. As shown in FIG. 1, a rupture line in which a plurality of bridges 25 that can be broken and slits 27 that are cut in the circumferential direction are alternately arranged is formed at the lower end of the skirt portion 24. A TE band 26 that is an annular member that is separated from the skirt portion 24 according to the opening operation through the bridge 25 is integrally formed. Therefore, the bridge 25 and the TE band 26 are also made of metal.

  A synthetic resin liner 22 that seals the open end of the container body is provided on the inner surface of the top plate portion 23. The liner 22 is formed in an annular shape so as to face the curled portion 11 of the container body 10 at the peripheral portion of the inner surface of the top plate portion 23 of the cap 20. For example, as illustrated in FIG. 2, a recessed portion 22 a that is in close contact with the top portion 11 a of the curled portion 11 that is an open end, and a portion that protrudes downward from the inner peripheral edge of the recessed portion 22 a and that is inside the curled portion 11. An inner protrusion 22b formed so as to face the peripheral side wall 11g, and an outer protrusion formed so as to protrude downward from the outer peripheral edge of the recessed portion 22a and in close contact with the outer peripheral side wall 11c of the curled portion 11 This is a resin liner 22 having a portion 22c. In addition, the outer peripheral surface of the outer protrusion 22c and the inner peripheral surface of the skirt portion 24 of the cap 20 are not bonded.

  As shown in FIG. 1, the skirt portion 24 has a screw portion 24 a formed so as to correspond to the screw portion 12 formed on the mouth-neck portion 10 a of the container body 10, and a radius above the screw portion 24 a. A knurl portion 24b is formed in which recesses 24e and ridges in the direction are alternately arranged in an annular shape in the circumferential direction, and an upper portion of the recess 24e of the knurl portion 24b is formed inside the container when the container 1 is opened. A vent slit 24c, which is a cut extending in the circumferential direction, is formed in order to quickly discharge a gas such as a gas, that is, to discharge the pressure inside the container at the time of opening.

  Furthermore, the outer protrusion 22c of the liner 22 is placed on the outer peripheral side surface 11d of the curl 11 at a position above the skirt 24 in the cap 20 and in a position where the curl 11 and the outer protrusion 22c are in close contact with each other. An annular recess 24d is formed which is recessed inward in the radial direction so as to be pressed against the inner surface. For example, the concave portion 24d is formed so as to be positioned between the peripheral portion of the top plate portion 23 and the vent slit 24c formed intermittently in the circumferential direction in the axial direction. The recessed portion 24d is formed below the top plate portion 23 with an interval in the axial direction. In other words, the recess 24 d is partially provided in the upper part of the skirt portion 24. For this reason, the outer diameter of the concave portion 24d that is recessed most inward in the radial direction is formed to be smaller than the upper portion of the skirt portion 24 positioned above the outer diameter. Further, the thickness of the outer protrusion 22c of the liner 22 is thinner in the radial direction than the portion above or below the portion depressed by being pressed by the recess 24d. In other words, an inflatable portion that has a liner 22 thicker than the portion pressed by the recess 24d and projects outward in the radial direction from the recess 24d is formed above the recess 24d. In the closed state, the most recessed portion of the concave portion 24d inward in the radial direction is preferably equal to or lower than the center position in the axial direction of the outer peripheral side surface 11d of the curled portion 11. . Further, in this position, a concave portion 24d is formed with respect to the position of the top portion 11a of the mouth / neck portion 10a of the container main body 10 with respect to the cap 20 that is covered and crowned on the container main body 10 at the time of roll-on molding. The position may be determined.

  Due to the concave portion 24d formed at a predetermined position of the skirt portion 24, the outer protrusion 22c of the resin liner 22 formed on the cap 20 is brought into close contact with the outer peripheral side wall 11c of the curl portion 11 in the closed state. Is done. In particular, the concave portion 24d formed to be recessed inward in the radial direction is the outer protrusion 22c and the outer peripheral side surface 11d of the outer peripheral side wall 11c which are in close contact with each other.

  Further, in the unopened state before the bridge 25 is broken or in the closed state where the cap 20 is not rotated relative to the container body 10, the lower end of the outer protrusion 22 c of the liner 22 is lower in the axial direction than the lower end portion 11 b of the curled portion 11. Is located. That is, the outer projection 22c of the liner 22 is positioned at a lower end below the lower end portion 11b of the curled portion 11 at least in an unopened state, and the container 1 maintains a sealed state. Further, the concave portion 24d of the skirt portion 24 is formed so as to push the outer protrusion portion 22c radially inward, so that the portion pressed by the concave portion 24d of the outer protrusion portion 22c is the outer side surface 11d of the curl portion 11. In addition, the liner material pressed by the recess 24d moves so as to escape in the vertical direction, so that the outer protrusion 22c positioned below the recess 24d becomes a surplus. The lower end portion is deformed so as to protrude inward in the radial direction so as to be in close contact with the outer peripheral lower surface 11 f of the curled portion 11. On the other hand, the outer protrusion 22c located above the recess 24d also increases the amount of resin due to the movement of the liner material pressed by the recess 24d. Thereby, the outer protrusion 22c above the recess 24d can secure a sufficient thickness, and as a result, an impact is applied to the corner portion of the cap 20 when the sealed container is accidentally dropped. However, since the sealing property can be sufficiently secured, the drop impact resistance can be improved.

  Next, a method of forming the annular recess 24d in the cap 20 when the cap 20 is attached to the container body 10 and roll-on molding will be described. FIG. 3 is a view schematically showing the capping device 30 for capping the container body 10 with the cap 20 by roll-on molding. The cap 20 covered with the mouth / neck portion 10 a of the container body is subjected to an axial load by the pressing machine 32 of the capping device 30.

  In this way, while pressing the top plate portion 23 of the cap 20, a load from the forming roller 31 that forms the recess 24 d is applied to the outer surface of the skirt portion 24 from the direction orthogonal to the axial direction, that is, the horizontal direction. FIG. 4 is an enlarged schematic view of a pressing portion between the cap 20 and the forming roller 31 illustrated in FIG. As illustrated in FIG. 4 and the like, the position where the molding load is applied is on the upper side of the skirt portion 24 and the outer peripheral side surface 11d of the curl portion 11 and the outer protrusion portion 22c of the liner 22 are in close contact with each other. It is. The position is determined such that the height of the pressing surface related to the forming roller 31 is set at a position lower than the reference position by a predetermined height with reference to a predetermined position at the lower end of the capping device 30, for example. It may be a thing. The broken line illustrated in FIG. 4 is a vertical cross-sectional view showing a position where the skirt portion 24 is located before the forming load is applied by the forming roller 31.

  Further, the forming roller 31 applies a load to the cap 20 from a direction perpendicular to the axial direction, that is, a horizontal direction while circularly moving the outer ring of the cap 20 in the circumferential direction. Therefore, by changing the molding torque of the molding roller 31, the degree to which the concave portion 24d is recessed inward in the radial direction can be changed. The molding torque is a load applied to the cap 20 when the recess 24d is molded.

  When the material of the cap 20 is an aluminum alloy, the molding torque is preferably 1 N · m or more and 4 N · m or less, and by setting the range within this range, excessive molding damage is given to the skirt portion 24 and the liner 22 of the cap 20. The liner 22 can be brought into close contact with the outer peripheral side surface 11d of the curled portion 11 without any problem.

  The portion of the forming roller 31 where a forming load is applied to the cap 20 is formed in an inclined shape so that a longitudinal section thereof is formed in a curved shape, and a tapered surface that gradually decreases in diameter toward the lower side thereof is formed. ing. Accordingly, it is possible to prevent the screw portion 24a from being pushed inward in the radial direction due to the influence of forming the recess 24d.

  Further, in the above-described forming step of the recess 24d, the TE band 26 is formed in the mouth and neck by a skirt roller which is a so-called PP roller which is roll-on formed by a screw roller which is a so-called RO roller for forming the screw portion 24a and is wound around the lower end of the skirt portion 24. Although it can be performed after the portion 10a is wound and formed, it is preferably performed before or simultaneously with the screw portion 24a.

  Next, the opening operation of the cap 20 in the sealed container 1 will be described. A state in which the cap 20 is not opened in the sealed container 1 will be specifically described with reference to FIGS. When the container 1 is unopened, the TE band 26 of the cap 20 is not separated and is integrally connected to the cap 3 via the bridge 25. In this sealed state, the outer protrusion 22c of the liner 22 is pushed in by the recess 24d and is in close contact with the outer peripheral side surface 11d of the curl portion 11. Further, the lower end of the outer protrusion 22c is pushed inward in the radial direction from the outer peripheral side surface 11d and is in contact with the outer peripheral lower surface 11f.

  In accordance with the opening operation of the container 1 from such a close contact state, the cap 20 rises in the axial direction and starts to rise upward with respect to the mouth-neck portion 10a of the container body 10. However, even if the TE band 26 tries to move upward, it is locked by the jaw 13 of the mouth-and-neck portion 10a and is prevented from moving upward in the axial direction. As a result, the bridge 25 begins to break gradually, and when completely broken, the cap 20 and the TE band 26 are separated. Therefore, the cap 20 is lifted by a predetermined amount until the TE band 26 is completely separated, but the close contact state between the outer peripheral side wall 11c of the curled portion 11 and the outer protruding portion 22c is continued during this time. The sealing property of the container 1 is ensured.

  For example, if the length of the outer peripheral side surface 11d in the axial direction is longer than the rising amount of the cap 20 until the TE band 26 is separated, the close contact state with the outer protrusion 22c can be continued. Alternatively, the outer protrusion 22c and the outer peripheral surface 11d are arranged such that the length in the axial direction at the contact portion between the outer protrusion 22c and the outer peripheral surface 11d that are in close contact with each other in the unopened state is longer than the rising amount. It only has to be formed. Further, it is only necessary that at least the lower end of the outer protruding portion 22c is positioned below the axially lower portion of the concave portion 24d that is recessed most radially inward.

  Thus, in the opening operation of the container 1 according to the present invention, the upward movement of the cap 3 in the axial direction and the continuation of the sealed state of the container 1 are not linked, that is, the moment when the TE band 26 is separated. It does not mean that the sealed state in the container is immediately released. The TE band 26 separated according to the opening operation from the unopened state is locked as an annular member on the outer peripheral portion of the mouth-and-neck portion 10 a so as to be integrated with the container body 10. That is, when the bridge 25 is broken and the skirt portion 24 and the TE band 26 of the cap 3 are separated, it is visually recognized from the appearance that the cap 20 of the container 1 is once opened and unopened. It is a possible configuration.

  As described above, according to the container 1 in this embodiment, the liner 22 can be spread to the outer peripheral lower surface 11f side of the curled portion 11 by pressing the liner 22 against the curled portion 11 from the horizontal direction. As a result, when the cap 20 is opened, the outer protruding portion 22c can be kept in close contact with the curled portion 11 until the bridge 25 is broken.

  In addition, the container which concerns on this invention is not limited to the above-mentioned embodiment. Modifications can be made as appropriate without departing from the scope of the present invention.

  For example, in the above-described embodiment, the curled portion 11 having the outer peripheral side surface 11d having a linear longitudinal section parallel to the axial direction has been described. However, a linear longitudinal section inclined from the axial direction, that is, a tapered surface is formed. It may be a curled portion having an outer peripheral side surface. In this case, the longitudinal section of the inner peripheral wall may also be a linear tapered surface inclined in the axial direction.

  Further, in the metal cap-equipped container and the method of forming the metal cap-equipped container according to the present invention, the liner 22 and the shape of the skirt portion 24 before roll-on molding by the molding roller 31 as illustrated by a broken line in FIG. It does not matter whether or not the outer peripheral side wall 11c of the curled portion 11 is in close contact. That is, in the container 1 according to the present invention, regardless of the state before the roll-on molding of the recess 24d by the molding roller 31, the outer protrusion 22c and the outer peripheral side surface 11d are in close contact with each other by the annular recess 24d. It only has to be done.

  Furthermore, although the embodiment has been described in which the liner 22 provided on the inner surface side of the top plate portion 23 is formed in an annular shape so as to face the mouth portion of the mouth-and-neck portion 10a, it is not limited to this. For example, the liner 22 formed so that the mouth portion of the mouth-and-neck portion 10a is in close contact with the recessed portion 22a may be used, and a resin liner is provided over the entire inner surface side of the top plate portion 23. An outer protrusion may be formed so as to hang down only the portion facing the. Further, the inner protrusion 22b may or may not be in close contact with the inner peripheral side of the mouth and neck portion 10a. That is, the outer peripheral side wall 11c of the curled portion 11 and the liner 22 are formed regardless of whether or not the inner protruding portion 22b is formed so as to hang from the top plate portion 23 in a shape along the inner peripheral surface of the mouth and neck portion 10a. What is necessary is just to ensure the sealing performance of the container 1 by close contact.

  DESCRIPTION OF SYMBOLS 1 ... Container, 10 ... Container main body, 10a ... Mouth neck part, 11 ... Curl part, 11c ... Outer peripheral side wall, 11d ... Outer peripheral side surface, 11f ... Outer peripheral lower surface, 12 ... Screw part, 20 ... Cap, 22 ... Liner, 22c ... Outer protrusion, 23 ... Top plate, 24 ... Skirt, 24a ... Screw, 24d ... Recess, 25 ... Bridge, 26 ... Tamper evidence band (TE band), 27 ... Slit, 30 ... Capping device, 31 ... Molding roller.

Claims (6)

A container body having a mouth / neck portion in which a mouth portion which is an open end and a cylindrical neck portion is integrated, and a top plate portion having a liner which is a sealing member in close contact with the open end on the inner surface side And a metal cap with a metal cap having a skirt part formed with a thread part that hangs down from the peripheral part of the top plate part and is screwed to the outer peripheral surface of the neck part,
The resin liner is disposed so as to be in close contact with at least the outer peripheral side wall of the mouth,
The cap has an annular recess recessed inward in the radial direction so as to press the liner against the outer peripheral side wall between the peripheral edge portion and the screw portion in the skirt portion,
A container with a metal cap, wherein the liner is brought into close contact with the outer peripheral side wall by the recess. The outer peripheral side wall of the mouth portion includes an outer peripheral side surface formed in a straight shape in a longitudinal section,
2. The liner according to claim 1, wherein the liner is disposed so as to be in close contact with at least the outer peripheral side surface of the outer peripheral side wall, and is in close contact with the outer peripheral side surface by the concave portion. Container with metal cap.   3. The container with a metal cap according to claim 1, wherein the liner is brought into close contact with an outer peripheral lower surface of the outer peripheral side wall formed in a curved shape in a longitudinal section by the concave portion. A container body having a mouth / neck portion in which a mouth portion which is an open end and a cylindrical neck portion is integrated, and a top plate portion having a liner which is a sealing member in close contact with the open end on the inner surface side And a metal cap having a skirt portion formed with a screw portion that is suspended from the peripheral portion of the top plate portion and screwed onto the outer peripheral surface of the neck portion. And
Between the screw portion from the peripheral portion of the top plate portion in the skirt portion,
To form an annular recess that is recessed inward in the radial direction so as to press the resin liner disposed in close contact with the outer peripheral side wall of the mouth portion against the outer peripheral side wall,
With a metal cap, wherein a load by a forming roller is applied to the cap from the outer surface side of the cap that is attached to the mouth and neck of the container body in a direction orthogonal to the axial direction of the container body Container molding method. The outer peripheral side wall of the mouth includes an outer peripheral side surface formed linearly in a longitudinal section, and an outer peripheral lower surface formed curved in a longitudinal section,
The liner disposed so as to be in close contact with at least the outer peripheral side surface of the outer peripheral side wall is in close contact with the outer peripheral side surface, and the lower end of the liner is in close contact with and in contact with the outer peripheral lower surface. 5. The method for forming a container with a metal cap according to claim 4, wherein the concave portion to be pushed inward in the radial direction is formed. 6. The metal according to claim 4, wherein the recess is formed by applying a forming load in a direction orthogonal to the axial direction by the forming roller having a forming torque of 1 N · m to 4 N · m. A method of forming a container with a cap.

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