WO2013077099A1 - 炭酸飲料充てん容器用合成樹脂製キャップ、閉止装置、および飲料入り閉止装置 - Google Patents
炭酸飲料充てん容器用合成樹脂製キャップ、閉止装置、および飲料入り閉止装置 Download PDFInfo
- Publication number
- WO2013077099A1 WO2013077099A1 PCT/JP2012/076204 JP2012076204W WO2013077099A1 WO 2013077099 A1 WO2013077099 A1 WO 2013077099A1 JP 2012076204 W JP2012076204 W JP 2012076204W WO 2013077099 A1 WO2013077099 A1 WO 2013077099A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- synthetic resin
- resin cap
- container
- seal protrusion
- carbonated beverage
- Prior art date
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 38
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 38
- 235000014171 carbonated beverage Nutrition 0.000 title claims abstract description 37
- 235000013361 beverage Nutrition 0.000 title claims description 12
- 230000007423 decrease Effects 0.000 claims abstract description 8
- 229920002994 synthetic fiber Polymers 0.000 claims 1
- 239000000314 lubricant Substances 0.000 description 27
- 238000003825 pressing Methods 0.000 description 25
- 238000007789 sealing Methods 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 11
- 238000004804 winding Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 8
- 230000006866 deterioration Effects 0.000 description 7
- 235000014113 dietary fatty acids Nutrition 0.000 description 5
- 229930195729 fatty acid Natural products 0.000 description 5
- 239000000194 fatty acid Substances 0.000 description 5
- 150000004665 fatty acids Chemical class 0.000 description 5
- -1 polyethylene terephthalate Polymers 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000015040 sparkling wine Nutrition 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 244000131522 Citrus pyriformis Species 0.000 description 1
- 240000000560 Citrus x paradisi Species 0.000 description 1
- 235000016795 Cola Nutrition 0.000 description 1
- 235000011824 Cola pachycarpa Nutrition 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241000220225 Malus Species 0.000 description 1
- 235000011430 Malus pumila Nutrition 0.000 description 1
- 235000015103 Malus silvestris Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 235000009754 Vitis X bourquina Nutrition 0.000 description 1
- 235000012333 Vitis X labruscana Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 235000014080 ginger ale Nutrition 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 235000020094 liqueur Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
- B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
- B65D41/0414—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck
- B65D41/0421—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck and combined with integral sealing means contacting other surfaces of a container neck
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
- B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
- B65D41/0428—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a collar, flange, rib or the like contacting the top rim or the top edges or the external surface of a container neck
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/325—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings with integral internal sealing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
- B65D41/3442—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with rigid bead or projections formed on the tamper element and coacting with bead or projections on the container
- B65D41/3447—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with rigid bead or projections formed on the tamper element and coacting with bead or projections on the container the tamper element being integrally connected to the closure by means of bridges
Definitions
- the present invention relates to a synthetic resin cap for closing a container mouth, a closing device using the same, and a beverage containing closing device, and more specifically, a synthetic resin cap used for a container filled with a carbonated beverage, and a closing using the same
- the present invention relates to a device and a beverage containing closure device.
- a synthetic resin cap (hereinafter simply referred to as a cap) used for a container filled with a carbonated beverage includes a top plate portion and a cylindrical portion hanging from the periphery thereof, and a screw portion is formed on the inner surface of the cylindrical portion.
- a cap see, for example, Patent Document 1.
- FIG. 6 shows an example of a cap.
- the cap 31 includes a top plate portion 32 and a cylindrical portion 33 suspended from the periphery thereof.
- a screw part 40 to be fitted is formed.
- the container 20 is made of polyethylene terephthalate (PET) or the like.
- the inner seal projection 42 is fitted into the mouth portion 21 of the container 20 and abuts against the inner surface 21 a of the mouth portion 21, and the portion of the mouth portion 21 that extends from the opening end surface 21 b to the outer surface 21 c is in contact.
- An outer seal protrusion 44 is formed. The inner and outer seal protrusions 42 and 44 abut against the mouth portion 21 of the container 20 to seal the container 20.
- the outer seal protrusion 44 is in contact with the container 20 with a stronger pressing force than the inner seal protrusion 42, and becomes a main body for sealing.
- the cap 31 Since the cap 31 is used for the container 20 filled with a carbonated beverage, the internal pressure of the container 20 may increase and the top plate portion 32 may bulge and deform upward. When the top plate portion 32 bulges and deforms, the inner seal protrusion 42 also moves upward. Therefore, the inner seal protrusion 42 is designed to contact the inner surface 21a at a low position.
- FIG. 7 shows another example of the cap.
- the cap 51 includes a cap main body 54 including a top plate portion 52 and a cylindrical portion 53 suspended from the periphery thereof, and a screw portion 60 is formed on the inner surface of the cylindrical portion 33.
- An inner seal projection 62 that contacts the inner surface 21a of the mouth portion 21 and an opening end seal projection 63 that contacts a portion from the opening end surface 21b of the mouth portion 21 to the outer surface 21c are formed on the inner surface of the top plate portion 52. .
- the opening end seal projection 63 seals the mouth portion 21 in a state of being bent and deformed in the diameter increasing direction until it is pushed by the mouth portion 21 of the container 20 and abuts against the cap main body 54 at the time of closing (see, for example, Patent Document 2).
- the caps 31 and 51 are used for the container 20 filled with the carbonated beverage, the internal pressure of the container 20 is increased, and thus high sealing performance is required.
- the dimensions of the mouth portion 21 (inner diameter, outer diameter, etc.) of the container 20 may fluctuate due to changes in the environmental temperature, which may affect the sealing performance of the caps 31 and 51. Further, when an impact from the outside is applied, the sealing performance of the outer seal protrusion 44 may be lowered, and the sealing performance may be lowered.
- a lubricant such as erucic acid amide
- a lubricant is usually added to the caps 31 and 51 in order to optimize the opening and closing properties, but in the cleaning process prior to filling the container 20 with the content liquid, In some cases, the lubricant on the surfaces 31 and 51 was washed away, and a sufficient effect of the lubricant could not be obtained. Further, the amount of lubricant bleed on the surfaces of the caps 31 and 51 is likely to vary depending on the time since the production, the season, etc., and thus it is not easy to properly exert the function of the lubricant. For this reason, there is a demand for a cap that can provide good opening and closing properties without adding a lubricant.
- An object of the present invention is to provide a cap for a carbonated beverage filling container, a closing device using the cap, and a beverage containing closing device.
- the present invention is a synthetic resin cap that is attached to the mouth portion of a container filled with carbonated beverages, comprising a top plate portion and a cylindrical portion that hangs down from the periphery thereof, on the inner surface of the top plate portion, An inner seal protrusion that fits into the mouth portion and an outer seal protrusion that contacts the outer surface of the mouth portion are formed, and the outer surface of the inner seal protrusion is spaced from the opening end of the mouth portion toward the container body side.
- a contact convex portion is formed to contact the inner surface of the mouth portion to seal the container, and the outer seal protrusion has an inner surface whose inner diameter decreases toward the tip, and is a lower end of the inner surface.
- a synthetic resin cap for carbonated beverage filling containers in which the minimum inner diameter portion is in contact with the outer surface of the mouth portion at a position away from the opening end of the mouth portion toward the container body. It is preferable that a minimum inner diameter portion of the outer seal protrusion is higher than a maximum outer diameter portion of the contact convex portion of the inner seal protrusion.
- the outer seal protrusion is preferably formed in a plate shape. The height difference between the minimum inner diameter portion and the maximum outer diameter portion is preferably 2.5 mm or less.
- the outer seal protrusion preferably has an average thickness from the base end portion to the minimum inner diameter portion of 0.5 to 2 mm.
- the synthetic resin cap for a carbonated beverage filling container of the present invention can form a thin-walled portion having a smaller thickness than other portions at a position close to the base end portion of the inner seal protrusion.
- the present invention is a closing device including a container filled with a carbonated beverage and a synthetic resin cap attached to a mouth portion of the container, wherein the synthetic resin cap is suspended from the top plate portion and the periphery thereof.
- An inner seal projection that fits into the mouth portion and an outer seal projection that contacts the outer surface of the mouth portion, and the outer surface of the inner seal projection is formed on the outer surface of the inner seal projection.
- a contact convex portion that contacts the inner surface of the mouth portion and seals the container is formed at a position away from the opening end of the mouth portion toward the container body, and the outer seal protrusion is directed toward the tip.
- a closing device that has an inner surface with a smaller inner diameter, and a minimum inner diameter portion that is a lower end of the inner surface is in contact with the outer surface of the mouth portion at a position away from the opening end of the mouth portion toward the container body.
- the present invention is a beverage containing closure device comprising a container filled with carbonated drink and a synthetic resin cap attached to the mouth of the container, wherein the synthetic resin cap is filled with carbonated drink And a synthetic resin cap attached to the mouth portion, wherein the synthetic resin cap includes a top plate portion and a cylindrical portion depending from the peripheral edge of the top plate portion.
- An inner seal protrusion that fits into the mouth portion and an outer seal protrusion that contacts the outer surface of the mouth portion are formed on the inner surface, and the outer surface of the inner seal protrusion has a container body from the opening end of the mouth portion.
- a contact convex portion that contacts the inner surface of the mouth portion and seals the container is formed at a position apart from the side, and the outer seal projection has an inner surface whose inner diameter decreases toward the tip, and the inner surface The minimum inner diameter that is the lower end of the At a position away to the container body side from the open end of the mouth portion, to provide a contact with the beverage-containing closure device to the outer surface of the mouth portion.
- the outer seal projection has an inner surface whose inner diameter decreases toward the tip and abuts the outer surface of the mouth portion at the lower end thereof, so that the outer seal projection can be provided with follow-up deformability. Therefore, even when an impact is applied from the outside, the contact state with the outer surface of the mouth portion can be maintained, and the deterioration of the sealing performance can be prevented.
- the position of the inner seal protrusion that contacts the container is designed to be relatively low in consideration of the bulging deformation caused by the increase in the container internal pressure, so that the inner part of the mouth of the container tends to be deformed inward.
- the present invention since the contact position of the outer seal protrusion with the outer surface of the mouth portion is lowered, the difference in height of the mouth portion pressing position between the outer seal protrusion and the inner seal protrusion can be reduced. Even when the height is increased, inward deformation of the mouth portion of the container can be prevented, and deterioration of the sealing performance can be prevented. According to the present invention, the outer seal protrusion is in contact with the mouth portion at the distal end side from the base end portion, and therefore, the pressing force on the mouth portion can be easily set lower than when the contact position is the base end portion.
- the present invention it is preferable at the point which optimizes the ratio of the pressing force of an outer seal protrusion and an inner seal protrusion, and prevents an inward deformation
- the inner sealing force of the outer seal protrusion can be lowered without deteriorating the sealing performance due to the structure of the outer seal protrusion described above. Therefore, the opening torque and the closing torque are suppressed, and the opening ability and the closing ability are good. Can be. For this reason, a lubricant is unnecessary. Although it is not easy for a lubricant to properly exhibit its functions (for example, suppression of opening torque and closing torque), the present invention does not require a lubricant, so that stable opening and closing properties can be obtained. .
- the phenomenon that the carbonated beverage foams violently at the time of opening and does not overflow from the mouth portion does not occur.
- the reason why the present invention can prevent the overflowing phenomenon of carbonated beverages is not clear, it may be related to the fact that no lubricant is required.
- FIG. 1A, FIG. 1B, and FIG. 2 show one embodiment of the synthetic resin cap and closing device of the present invention.
- the closing device shown here is a synthetic resin that is attached to the container 20 and its mouth 21. It comprises a cap 1 (hereinafter simply referred to as cap 1).
- FIG. 1A shows the cap 1 not attached to the mouth portion 21, and
- FIG. 1B shows the cap 1 attached to the mouth portion 21.
- 2 indicates the central axis of the cap 1.
- the vertical direction is the vertical direction in FIGS. 1A, 1B, and 2 and is a direction along the central axis C1.
- the height direction is also the height direction in FIGS. 1A, 1B and 2, and is a direction along the central axis C1.
- the container 20 is made of a synthetic resin such as polyethylene terephthalate (PET), for example, and has a container main body 24 filled with a beverage and a mouth portion 21 formed on the upper part thereof.
- a male screw 22 is formed on the outer surface 21 c of the mouth portion 21.
- the locking step portion 23 formed below the male screw 22 is an annular protrusion that protrudes radially outward.
- the illustrated inner surface 21 a and outer surface 21 c are surfaces along the axial direction of the container 20.
- the opening end surface 21 b is a surface perpendicular to the axial direction of the container 20.
- the cap 1 includes a circular top plate portion 2 and a cylindrical portion 3 hanging from the periphery thereof.
- the cylinder part 3 is divided into a main part 8 by a score 6 (weakening part) and a tamper evidence ring part (TE ring part) 9 connected to the main part 8 by a bridge 7 (see FIG. 2).
- a screw portion 10 that is screwed into the male screw 22 of the container 20 is formed.
- the screw portion 10 is a ridge formed in one or a plurality of spirals.
- the top plate portion 2 has an annular inner seal protrusion 12 that fits into the mouth portion 21 of the container 20 and abuts against the inner surface 21 a of the mouth portion 21, and an open end surface of the mouth portion 21.
- An annular opening end seal projection 13 that abuts on 21 b and an annular outer seal projection 14 that abuts on the outer surface 21 c of the mouth portion 21 are formed.
- the inner seal protrusion 12 is formed to extend downward from the inner surface 2 a (lower surface) of the top plate portion 2.
- an annular contact protrusion 12a that contacts the container inner surface 21a is formed at a position away from the base end portion 12e (that is, in the extending direction of the inner seal protrusion 12).
- the cross-sectional shape of the contact protrusion 12a can be a curved shape such as a substantially arc shape or a substantially elliptic arc shape.
- the innermost surface 21a has no gap over the entire circumference at a position where the maximum outer diameter portion 12b of the contact convex portion 12a is separated from the opening end surface 21b toward the container main body 24. It abuts and is formed so that the container 20 can be sealed (sealed).
- the outer diameter of the maximum outer diameter portion 12b is preferably slightly larger than the inner diameter of the mouth portion 21.
- the base end portion 12e of the inner seal projection 12 and the outer surface 12f in the vicinity thereof are formed with a weakened recess 12c over the entire circumference, and the inner seal projection 12 of the portion where the weakened recess 12c is formed is formed on other portions.
- the thin portion 12d has a smaller thickness.
- the thin portion 12d can be formed at a position close to the base end portion 12e.
- the thickness of the thin portion 12d that is, the thickness T1 shown in FIG. 1A is preferably 1 to 2.2 mm (preferably 1.2 to 2 mm, more preferably 1.4 to 1.8 mm).
- the inner seal protrusion 12 can be given rigidity to the extent that deformation (such as buckling deformation) does not occur when the thin portion 12d is inserted into the mouth portion 21.
- the height position of the maximum outer diameter portion 12b of the inner seal protrusion 12 is such that the height difference H1 between the maximum outer diameter portion 12b and the lower end (projection end) of the opening end seal protrusion 13 is 1 to 4 mm (preferably 1.5 to 3 mm). It is preferable to set so that. If the height difference H1 is too small, as shown by a two-dot chain line in FIGS. 1A and 1B, the top plate 2 bulges upward due to an increase in the internal pressure of the container 20 and the inner seal protrusion 12 moves upward. Tamper evidence is reduced. If the height difference H1 is too large, inward deformation of the mouth portion 21 is likely to occur when the environmental temperature fluctuates.
- the inward deformation of the mouth portion 21 is a bending deformation in the direction in which the opening end surface 21b moves radially inward.
- the opening end seal projection 13 is formed so as to protrude downward from the inner surface 2a (lower surface) of the top plate portion 2.
- the cross-sectional shape of the open end seal protrusion 13 can be, for example, a semicircular shape, an arc shape, or an elliptical arc shape.
- the outer seal protrusion 14 is formed to extend downward from the inner surface 2a (lower surface) of the top plate portion 2 with the inner diameter gradually decreasing in the distal direction.
- the outer seal protrusion 14 can be a cylindrical plate.
- the outer seal protrusion 14 can be formed so as to gradually reduce the thickness toward the tip.
- the inner surface 14a of the outer seal projection 14 is an inclined surface that is inclined so that the inner diameter gradually decreases toward the tip.
- the inner surface 14a is preferably inclined at a constant angle.
- the lower end of the inner surface 14 a is a minimum inner diameter portion 14 d of the outer seal protrusion 14.
- the outer seal protrusion 14 is formed such that the minimum inner diameter portion 14d is in contact with the outer surface 21c over the entire circumference at a position away from the opening end surface 21b toward the container main body 24 so that the container 20 can be sealed. Since the outer seal projection 14 contacts the outer surface 21c at a position away from the opening end surface 21b, it is possible to follow and deform so that the tip of the outer seal projection 14 moves radially inward and outward. For this reason, even when an impact is applied from the outside, the contact state with respect to the outer surface 21c can be maintained, and deterioration of the sealing performance can be prevented.
- the inner diameter of the maximum outer diameter portion 14d is preferably slightly smaller than the outer diameter of the mouth portion 21.
- the height position of the minimum inner diameter portion 14 d of the outer seal protrusion 14 is, for example, at a position equivalent to or higher than the maximum outer diameter portion 12 b of the inner seal protrusion 12.
- the height position of the minimum inner diameter portion 14d is set so that the height difference H2 between the minimum inner diameter portion 14d and the lower end (projection end) of the opening end seal projection 13 is 0.5 to 2 mm (preferably 1 to 1.5 mm). It is preferable to do this. If the height difference H2 is too small, inward deformation of the mouth portion 21 is likely to occur when the environmental temperature varies. If the height difference H2 is too large, the inward pressing force of the outer seal protrusion 14 may be insufficient. By setting the height difference H2 within the above range, the sealing performance of the outer seal protrusion 14 can be improved, and inward deformation of the mouth portion 21 can be prevented even when the environmental temperature becomes high.
- the height difference H3 between the minimum inner diameter portion 14d of the outer seal protrusion 14 and the maximum outer diameter portion 12b of the inner seal protrusion 12 is preferably 2.5 mm or less (preferably 2 mm or less).
- the height difference H3 is preferably 0 mm or more.
- the front end surface 14b of the outer seal protrusion 14 is formed so as to gradually increase in diameter as it goes downward from the lower end of the inner surface 14a toward the outer surface 14c side.
- the cross-sectional shape of the front end surface 14b can be, for example, a convex shape having a substantially arc shape or a substantially elliptic arc shape.
- the outer surface 14c of the outer seal protrusion 14 is an inclined surface that is inclined so that the outer diameter gradually decreases toward the tip. It is desirable that the outer surface 14c be inclined at a certain angle.
- the average thickness of the outer seal protrusion 14 (the average thickness in the range from the base end portion 14e to the minimum inner diameter portion 14d, ie, the thickness T2 shown in FIG. 1A) is 0.5 to 2 mm (preferably 1 to 1.5 mm). ) Is preferred.
- the outer seal projection 14 can be made flexible to improve the impact absorption performance of the outer seal projection 14 and to obtain sufficient sealing performance. If the average thickness of the outer seal protrusion 14 is too small, the elastic force is reduced, so that the pressing force against the outer surface 21c is reduced, and the sealing performance is deteriorated. If the average thickness of the outer seal protrusion 14 is too large, the follow-up deformability is inferior. For example, when there is a recess formed on the outer surface 21c due to breakage or the like, the sealing performance is likely to deteriorate when an impact is applied to the cap 1.
- the inward pressing force of the outer seal protrusion 14 is a pressing force in a direction perpendicular to the outer surface 21c in FIG. 1A (left and right direction in FIG. 1A).
- the outward pressing force of the inner seal protrusion 12 is a pressing force in a direction perpendicular to the inner surface 21a in FIG. 1A (left-right direction in FIG. 1A).
- a locking projection 11 is formed that is a locking projection that locks with the locking step portion 23 of the container 20 to prevent the movement of the TE ring portion 9 when opening.
- the locking protrusion 11 is formed to protrude inward from the inner peripheral surface of the TE ring portion 9.
- the cap 1 can be made of a synthetic resin material such as high density polyethylene or polypropylene.
- the cap 1 can optimize the opening and closing properties without adding a lubricant (such as erucic acid amide).
- the cap 1 attached to the mouth portion 21 When the cap 1 attached to the mouth portion 21 is turned in the opening direction, the cap 1 rises according to the rotation. When the cap 1 is further rotated in the opening direction with the locking projection 11 reaching the lower end of the locking step 23, the main portion 8 rises as it rotates, while the locking projection 11 engages with the locking step 23. In order to stop, the TE ring part 9 is prevented from moving upward. As a result, a tensile force acts on the bridge 7 connecting the main portion 8 and the TE ring portion 9, the bridge 7 is broken, and the TE ring portion 9 is separated from the main portion 8. This clearly indicates that the cap 1 has been opened.
- the outer seal protrusion 14 has an inner surface 14 a that is inclined so that the inner diameter gradually decreases toward the tip, and the outer surface at a position away from the opening end surface 21 b at the minimum inner diameter portion 14 d at the lower end of the inner surface 14 a. Since it abuts against 21c, the outer seal projection 14 can be provided with follow-up deformability. Therefore, even when an impact is applied from the outside, the contact state with respect to the outer surface 21c can be maintained, and deterioration of the sealing performance can be prevented.
- a cap for a carbonated beverage filling container has a relatively low position of the inner seal protrusion in consideration of the bulging deformation of the top plate portion (refer to the two-dot chain line in FIG. 1A) due to the increase in the container internal pressure due to the carbonated beverage. Designed to touch the mouth. For this reason, the difference in height of the mouth portion pressing position between the outer seal protrusion and the inner seal protrusion is increased, and the inward deformation of the mouth portion is likely to occur when the environmental temperature is increased.
- the cap 1 since the contact position of the outer seal protrusion 14 with the mouth portion 21 is lowered, the difference in height of the mouth portion 21 pressing position between the outer seal protrusion 14 and the inner seal protrusion 12 can be reduced. Even when the temperature rises, inward deformation of the mouth portion 21 of the container 20 can be prevented, and deterioration of the sealing performance can be prevented. In addition, since the outer seal protrusion 14 is in contact with the mouth portion 21 at the distal end side minimum inner diameter portion 14d instead of the base end portion, the pressing force becomes too small or too large even when the outside diameter of the mouth portion 21 varies. Can be prevented.
- 14 is a structure in which the pressing force of 14 can be easily set low. Therefore, this structure is preferable in terms of the effect of optimizing the ratio between the pressing force of the outer seal protrusion 14 and the pressing force of the inner seal protrusion 12 and preventing inward deformation of the mouth portion 21 of the container 20.
- the cap 1 can reduce the inward pressing force of the outer seal projection 14 without deteriorating the sealing performance due to the structure of the outer seal projection 14 described above, the cap opening torque and the plug closing torque are suppressed, and the cap opening and closing properties are reduced. Can be improved. For this reason, a lubricant is unnecessary. When using a lubricant, it is not easy to properly exert its function (for example, suppression of opening torque and closing torque) due to the fact that the amount of bleeding of the lubricant is likely to fluctuate. Since it is unnecessary, stable opening and closing properties can be obtained. Furthermore, in the cap 1, the phenomenon that the carbonated beverage foams vigorously when the cap is opened and does not overflow from the mouth portion 21 does not occur. The reason why the cap 1 can prevent the phenomenon of overflowing carbonated beverages is not clear, but may be related to the fact that no lubricant is required.
- the closing device shown in FIG. 1A and the like can be made into a beverage containing closing device by filling a container 20 with a carbonated beverage and attaching the cap 1 to the mouth portion 21.
- Example 1 A cap 1 shown in FIG. 1A was produced. Cap 1 was made of high-density polyethylene and no lubricant was used. The cap 1 was attached to the mouth portion 21 of the container 20, and the closing device was subjected to a heat cycle test. The ratio (Fo: Fi) of the inward pressing force Fo with respect to the outer surface 21c of the outer seal protrusion 14 to the outer pressing force Fi with respect to the inner surface 21a of the inner seal protrusion 12 was 1.5: 1. In the heat cycle test, the process of placing the container 20 and the cap 1 under heating conditions (55 ° C.) for 9 hours and then placing them under cooling conditions (22 ° C.) for 15 hours was repeated twice. It was placed under the condition of ° C for 24 hours.
- the horizontal axis in FIG. 3 is the distance from the opening end surface 21b of the mouth portion 21 to the measurement location.
- 0.7 mm means a position that is 0.7 mm away from the opening end face 21 b toward the container body 24.
- the vertical axis in FIG. 3 is the outer diameter of the mouth portion 21.
- Example 1 A cap 51 shown in FIG. 7 was produced.
- the cap 51 was made of high-density polyethylene, and a lubricant (erucic amide. Amount added to the cap 51: 2000 mg / kg) was used.
- the cap 51 was attached to the mouth portion 21 of the container 20, and the closing device was subjected to the same heat cycle test as in Example 1.
- the ratio (Fo: Fi) of the inner seal protrusion outward pressing force Fo and the inner seal protrusion outward pressing force Fi was 6: 1.
- the result of measuring the outer diameter of the mouth portion 21 of the container 20 before and after the heat cycle test is shown in FIG. 3 and 4, it can be seen that in Example 1, the change in the outer diameter of the mouth portion 21 due to the heat cycle test could be suppressed.
- Example 2 The same tightening angle of the cap 1 as in Example 1 was measured.
- the number of samples was 25.
- FIG. 5 shows the distribution of the winding angle.
- the horizontal axis in FIG. 5 is the winding angle, and the vertical axis is the number of samples.
- the winding angle refers to the rotation angle of the cap 1 when the cap 1 is attached to the mouth portion 21 with a predetermined torque. After the cap 1 was manufactured, it was left at room temperature for 3 days, and then the winding angle was measured at room temperature.
- Example 3 A cap 1 similar to that of Example 1 was manufactured, left at room temperature for 3 days, then placed under heating conditions (55 ° C.) for 24 hours, and then the tightening angle of the cap 1 was measured at room temperature. Other conditions were the same as in Example 2. The results are shown in FIG.
- Comparative Example 2 A cap 51 similar to that of Comparative Example 1 was manufactured and allowed to stand at room temperature for 3 days, and then the winding angle was measured at room temperature. Other conditions were the same as in Example 2. The results are shown in FIG.
- Comparative Example 3 After producing the same cap 51 as in Comparative Example 1, the sample was allowed to stand for 3 days in a winter environment (average temperature of 10 ° C.) and then placed under heating conditions (55 ° C.) for 24 hours, and then the winding angle was measured at room temperature. did. Other conditions were the same as in Example 2. The results are shown in FIG.
- Comparative Example 4 After producing the same cap 51 as in Comparative Example 1, the sample was allowed to stand for 3 days in a summer environment (average temperature 40 ° C.) and then placed under heating conditions (55 ° C.) for 24 hours, and then the winding angle was measured at room temperature. did. Other conditions were the same as in Example 2. The results are shown in FIG.
- carbonated beverages are beverages in which carbon dioxide (carbon dioxide) is injected into water suitable for drinking, as defined in the Japanese Agricultural Standards (JAS), and sweeteners, acidulants, and flavors. It is a drink with the addition of. Specific examples include beverages with flavors such as lemon, lime, orange, grapefruit, grape, apple, ginger ale, cola, carbonated beverage with juice, carbonated beverage with milk, carbonated liqueur (can Chu-Hi, etc.), Examples include sparkling wine, beer, and sparkling wine.
- the partial pressure of carbon dioxide (carbon dioxide) is, for example, 0.02 MPa or more (20 ° C.).
- the lubricant is, for example, a hydrocarbon-based lubricant (such as liquid paraffin), a fatty acid-based lubricant (such as a higher fatty acid), a fatty acid amide-based lubricant (such as a fatty acid amide), an ester-based lubricant (such as a lower alcohol ester of a fatty acid), Alcohol-based lubricants (fatty alcohol, etc.), metal soap-based lubricants, etc.
- a hydrocarbon-based lubricant such as liquid paraffin
- a fatty acid-based lubricant such as a higher fatty acid
- a fatty acid amide-based lubricant such as a fatty acid amide
- an ester-based lubricant such as a lower alcohol ester of a fatty acid
- Alcohol-based lubricants fatty alcohol, etc.
- metal soap-based lubricants etc.
- Cap (caps made of synthetic resin for carbonated beverage filling containers) 2 Top plate portion 2a Inner surface 3 of top plate portion Cylinder portion 10 Screw portion 12 Inner seal projection 12a Abutting convex portion 12b Maximum outer diameter portion 12e Base end portion 12f Outer surface 13 Open end seal projection 14 Outer seal projection 14a Inner surface 14d Minimum inner diameter Part 14e Base end part 20 Container 21 Mouth part 21a Inner face 21b Open end face 21c Outer face 24 Container body T2 Average thickness in the range from the base end part of the outer seal protrusion to the minimum inner diameter part
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
Description
本願は、2011年11月21日に、日本に出願された特願2011-253824号に基づき優先権を主張し、その内容をここに援用する。
図6は、キャップの一例であり、このキャップ31は、天板部32とその周縁から垂下した筒部33とを備え、筒部33の内面に、容器20の口元部21の雄ネジ22に嵌合するネジ部40が形成されている。容器20はポリエチレンテレフタレート(PET)などからなる。
天板部32の内面には、容器20の口元部21に嵌入して口元部21の内面21aに当接する内側シール突起42と、口元部21の開口端面21bから外面21cにかけた部分に当接する外側シール突起44とが形成されている。内側および外側のシール突起42、44は、容器20の口元部21に当接して容器20を密封する。特に、外側シール突起44は、内側シール突起42に比べて強い押圧力で容器20に接し、密封の主体となる。
キャップ31は、炭酸飲料を充てんした容器20に用いられるため、容器20の内圧が高くなって天板部32が上方に膨出変形することがある。天板部32が膨出変形すると内側シール突起42も上方移動するため、これを考慮して、内側シール突起42は、低い位置で内面21aに当接するように設計される。
しかしながら、容器20は、環境温度の変化により口元部21の寸法(内径、外径等)が変動することがあり、これがキャップ31、51の密封性能に影響を及ぼすことがあった。また、外部からの衝撃が加えられた場合に、外側シール突起44のシール性が低下し、密封性能が低くなることがあった。
また、キャップ31、51には、通常、開栓性および閉栓性の適正化のため滑剤(エルカ酸アミド等)が添加されるが、容器20への内容液の充てんに先立つ洗浄工程において、キャップ31、51表面の滑剤が洗い流されてしまい、十分な滑剤の効果が得られないことがあった。また、キャップ31、51表面の滑剤のブリード量は、製造されてからの時間や季節等により変動しやすいため、滑剤の機能を適正に発揮させるのは容易ではない。
このため、滑剤を添加しなくても良好な開栓性および閉栓性が得られるキャップが要望されている。
本発明は上記事情に鑑みてなされたもので、環境温度の変化や外部からの衝撃による密封性能の低下が起こらず、かつ滑剤を添加しなくても良好な開栓性および閉栓性が得られる炭酸飲料充てん容器用のキャップ、このキャップを用いた閉止装置および飲料入り閉止装置を提供することを目的とする。
前記外側シール突起の最小内径部は、前記内側シール突起の当接凸部の最大外径部より高い位置にあることが好ましい。
前記外側シール突起は、板状に形成されていることが好ましい。
前記最小内径部と前記最大外径部との高低差は、2.5mm以下であることが好ましい。
前記外側シール突起は、基端部から前記最小内径部までの平均厚さが0.5~2mmであることが好ましい。
本発明の炭酸飲料充てん容器用合成樹脂製キャップは、前記内側シール突起の基端部に近接した位置に、他の部分より厚みが薄い薄肉部を形成することができる。
本発明の炭酸飲料充てん容器用合成樹脂製キャップは、滑材が添加されていないことが好ましい。
本発明は、炭酸飲料が充填された容器と、その口元部に装着される合成樹脂製キャップとを備えた飲料入り閉止装置であって、前記合成樹脂製キャップが、炭酸飲料が充てんされる容器と、その口元部に装着される合成樹脂製キャップとを備えた閉止装置であって、前記合成樹脂製キャップが、天板部とその周縁から垂下した筒部とを備え、前記天板部の内面に、前記口元部内に嵌入される内側シール突起と、前記口元部の外面に当接する外側シール突起とが形成され、前記内側シール突起の外面には、前記口元部の開口端部から容器本体側に離れた位置で、前記口元部の内面に当接して前記容器をシールする当接凸部が形成され、前記外側シール突起は、先端に向けて内径が小さくなる内面を有し、前記内面の下端である最小内径部が、前記口元部の開口端部から容器本体側に離れた位置で、前記口元部の外面に当接する飲料入り閉止装置を提供する。
従って、外部から衝撃が加えられた場合でも口元部外面に対する当接状態を維持し、密封性能の低下を防ぐことができる。
炭酸飲料用キャップでは、容器内圧上昇による膨出変形を考慮して内側シール突起の容器に当接する位置が比較的低く設計されるため、容器の口元部の内方変形が起こりやすい。これに対し、本発明によれば、外側シール突起の口元部外面に対する当接位置が低くなるため、外側シール突起と内側シール突起との口元部押圧位置の高低差を小さくできることから、環境温度が高くなった場合でも容器の口元部の内方変形を防止でき、密封性能の低下を防止できる。
本発明によれば、外側シール突起は、基端部より先端側で口元部に接するため、当接位置が基端部である場合に比べて口元部に対する押圧力を低く設定しやすい。このため、外側シール突起と内側シール突起の押圧力の比を適正化し、口元部の内方変形を防止する点で好ましい。
本発明では、前述の外側シール突起の構造により、密封性能を低下させずに外側シール突起の内方押圧力を低くできるため、開栓トルクおよび閉栓トルクを抑え、開栓性および閉栓性を良好にすることができる。このため、滑剤が不要である。滑剤は、その機能(例えば開栓トルクおよび閉栓トルクの抑制)を適正に発揮させるのが容易ではないが、本発明では滑剤が不要であるため、安定的な開栓性および閉栓性が得られる。
さらに、本発明では、開栓時に炭酸飲料が激しく発泡して口元部からあふれ出る現象が起こらない。本発明によって、炭酸飲料があふれ出る現象を防止できる理由は明らかではないが、滑剤が不要であることと関連がある可能性がある。
図1Aは口元部21に装着していない状態のキャップ1であり、図1Bは口元部21に装着した状態のキャップ1である。
図2における符号C1はキャップ1の中心軸を示す。以下の説明において、上下方向とは図1A、図1Bおよび図2における上下方向であり、中心軸C1に沿う方向である。高さ方向も図1A、図1Bおよび図2における高さ方向であり、中心軸C1に沿う方向である。
口元部21の外面21cには雄ネジ22が形成されている。雄ネジ22の下方に形成された係止段部23は、径方向外方に突出する環状突起である。
図示例の内面21aおよび外面21cは、容器20の軸方向に沿う面である。開口端面21bは容器20の軸方向に垂直な面である。
筒部3は、スコア6(弱化部)によって、主部8と、ブリッジ7(図2参照)によって主部8に連結されたタンパーエビデンスリング部(TEリング部)9とに区画されている。
主部8の内周面には、容器20の雄ネジ22に螺合するネジ部10が形成されている。
ネジ部10は、1条または複数条の螺旋状に形成された突条である。
内側シール突起12の外面12fには、基端部12eから下方に(すなわち内側シール突起12の延出方向に)離れた位置に、容器内面21aに当接する環状の当接凸部12aが形成されている。当接凸部12aの断面形状は、略円弧形、略楕円弧形などの湾曲形状とすることができる。
内側シール突起12は、口元部21内に嵌入した際に、当接凸部12aの最大外径部12bが、開口端面21bから容器本体24側に離れた位置で全周にわたって内面21aに隙間なく当接し、容器20を密封(シール)できるように形成されている。最大外径部12bの外径は、口元部21内径より若干大きいことが好ましい。これによって、内側シール突起12は、わずかに内方に弾性的に曲げ変形した状態で内面21aに当接するため、十分な押圧力で内面21aに当接する。
薄肉部12dの厚さ、すなわち図1Aに示す厚さT1は、1~2.2mm(好ましくは1.2~2mm、さらに好ましくは1.4~1.8mm)が好適である。薄肉部12dの厚さを前記範囲とすることによって、薄肉部12dに可撓性を与えることができるため、容器20の内圧上昇時において天板部2が上方に膨出変形した場合でも、内側シール突起12が内方変位しにくくなり、内側シール突起12のシール性が高められる。
また、薄肉部12dの厚さを前記範囲とすることによって、口元部21に嵌入される際に変形(座屈変形など)が起こらない程度の剛性を内側シール突起12に与えることができる。
高低差H1が小さすぎれば、図1A、図1Bに2点鎖線で示すように、容器20の内圧上昇により天板部2が上方に膨出変形して内側シール突起12が上方移動した場合にタンパーエビデンス性が低下する。高低差H1が大きすぎれば、環境温度が変動したときに口元部21の内方変形が起こりやすくなる。なお、口元部21の内方変形とは、開口端面21bが径方向内方に移動する方向の曲げ変形である。
高低差H1を前記範囲とすることで、十分なタンパーエビデンス性を確保し、かつ口元部21の内方変形を防止し、密封性能を高めることができる。
外側シール突起14の内面14aは、先端に向けて徐々に内径が小さくなるように傾斜する傾斜面となっている。内面14aは、一定の角度で傾斜していることが望ましい。
内面14aの下端は、外側シール突起14の最小内径部14dである。
外側シール突起14は、開口端面21bから離れた位置で外面21cに当接するため、外側シール突起14の先端が径方向内方および外方に移動するように追従変形が可能となる。このため、外部から衝撃が加えられた場合でも外面21cに対する当接状態を維持し、密封性能の低下を防ぐことができる。
また、外側シール突起14の外面21cに対する当接位置が低くなるため、この外側シール突起14の当接位置と、内側シール突起12の当接位置との高低差が小さくなることから、環境温度が高くなった場合でも、容器20の口元部21の内方変形を起こりにくくし、密封性能の低下を防止できる。
最大外径部14dの内径は、口元部21外径より若干小さいことが好ましい。これによって、外側シール突起14は、わずかに外方に弾性的に曲げ変形した状態で外面21cに当接するため、十分な押圧力で外面21cに当接する。
最小内径部14dの高さ位置は、最小内径部14dと開口端シール突起13下端(突出端)との高低差H2が0.5~2mm(好ましくは1~1.5mm)となるように設定するのが好適である。
高低差H2が小さすぎれば、環境温度が変動したときに口元部21の内方変形が起こりやすくなる。高低差H2が大きすぎれば、外側シール突起14の内方押圧力が不十分となることがある。
高低差H2を前記範囲とすることで、外側シール突起14のシール性を高め、かつ環境温度が高くなった場合でも口元部21の内方変形を防止できる。
高低差H3を前記範囲とすることで、環境温度が高くなった場合でも容器20の口元部21の内方変形を防止できる。
外側シール突起14の外面14cは、先端に向けて徐々に外径が小さくなるように傾斜する傾斜面となっている。外面14cは、一定の角度で傾斜していることが望ましい。
外側シール突起14の平均厚さを前記範囲とすることによって、外側シール突起14に可撓性を与えて外側シール突起14の衝撃吸収性能を高め、かつ十分なシール性を得ることができる。
外側シール突起14の平均厚さが小さすぎれば、弾性力が小さくなるため、外面21cに対する押圧力が小さくなり、シール性が低下する。外側シール突起14の平均厚さが大きすぎれば、追従変形性が劣り、例えば外面21cに破損等により形成された凹部がある場合にキャップ1に衝撃が加えられると密封性能が低下しやすくなる。
なお、外側シール突起14の内方押圧力とは、図1Aにおいて外面21cに対し垂直な方向(図1Aの左右方向)の押圧力である。内側シール突起12の外方押圧力は、図1Aにおいて内面21aに対し垂直な方向(図1Aの左右方向)の押圧力である。
係止突起11は、TEリング部9の内周面から内方に突出して形成されている。
係止突起11が係止段部23の下端に達した状態でキャップ1をさらに開栓方向に回すと、主部8は回転に従って上昇する一方、係止突起11が係止段部23に係止するためTEリング部9の上方移動は阻止される。
その結果、主部8とTEリング部9とを連結しているブリッジ7に引張力が作用し、ブリッジ7が破断し、TEリング部9が主部8から切り離される。
これによって、キャップ1が開栓されたことが明示される。
従って、外部から衝撃が加えられた場合でも外面21cに対する当接状態を維持し、密封性能の低下を防ぐことができる。
一般に、炭酸飲料充てん容器用のキャップは、炭酸飲料による容器内圧上昇を原因とする天板部の膨出変形(図1Aの2点鎖線参照)を考慮して、内側シール突起は比較的低い位置で口元部に接するように設計される。このため、外側シール突起と内側シール突起との口元部押圧位置の高低差が大きくなり、環境温度が高くなったときに口元部の内方変形が起こりやすくなる。
これに対し、キャップ1では、外側シール突起14の口元部21に対する当接位置が低くなるため、外側シール突起14と内側シール突起12との口元部21押圧位置の高低差を小さくできることから、環境温度が高くなった場合でも、容器20の口元部21の内方変形を防止でき、密封性能の低下を防止できる。
また、外側シール突起14は基端部ではなく先端側の最小内径部14dで口元部21に接するため、口元部21の外径のばらつきがあった場合でも、押圧力が過小または過大になるのを防止できる。
外側シール突起14が、基端部ではなく、これより先端側の最小内径部14dで口元部21に接する構造は、当接位置が基端部である場合に比べて口元部21に対する外側シール突起14の押圧力を低く設定しやすい構造である。従って、この構造は、外側シール突起14の押圧力と内側シール突起12の押圧力との比を適正化し、容器20の口元部21の内方変形を防止する効果の点で好適である。
滑剤を使用する場合は、滑剤のブリード量が変動しやすいなどの理由により、その機能(例えば開栓トルクおよび閉栓トルクの抑制)を適正に発揮させるのは容易ではないが、キャップ1では滑剤が不要であるため、安定的な開栓性および閉栓性が得られる。
さらに、キャップ1では、開栓時に炭酸飲料が激しく発泡して口元部21からあふれ出る現象が起こらない。キャップ1によって、炭酸飲料があふれ出る現象を防止できる理由は明らかではないが、滑剤が不要であることと関連がある可能性がある。
図1Aに示すキャップ1を作製した。キャップ1は高密度ポリエチレン製とし、滑剤は使用しなかった。このキャップ1を容器20の口元部21に装着し、この閉止装置をヒートサイクル試験に供した。外側シール突起14の外面21cに対する内方押圧力Foと、内側シール突起12の内面21aに対する外方押圧力Fiとの比(Fo:Fi)は1.5:1とした。
ヒートサイクル試験では、容器20およびキャップ1を加熱条件下(55℃)に9時間置き、次いで冷却条件下(22℃)に15時間置く工程を2回繰り返し、次いで、容器20およびキャップ1を5℃の条件下に24時間置いた。
ヒートサイクル試験の前後の容器20の口元部21の外径を測定した結果を図3に示す。図3の横軸は、口元部21の開口端面21bから測定箇所までの距離である。例えば0.7mmは、開口端面21bから容器本体24側に0.7mm離れた位置を意味する。図3の縦軸は、口元部21の外径である。
図7に示すキャップ51を作製した。キャップ51は高密度ポリエチレン製とし、滑剤(エルカ酸アミド。キャップ51への添加量:2000mg/kg)を使用した。
このキャップ51を容器20の口元部21に装着し、この閉止装置を実施例1と同様のヒートサイクル試験に供した。外側シール突起の内方押圧力Foと、内側シール突起外方押圧力Fiとの比(Fo:Fi)は6:1とした。
ヒートサイクル試験の前後の容器20の口元部21の外径を測定した結果を図4に示す。
図3および図4より、実施例1では、ヒートサイクル試験による口元部21の外径の変化を抑えることができたことがわかる。
実施例1と同様のキャップ1の巻締め角度を測定した。サンプル数は25個とした。図5は巻締め角度の分布を示す。図5の横軸は巻締め角度であり、縦軸はサンプル数である。
巻締め角度とは、キャップ1を所定のトルクで口元部21に装着した際のキャップ1の回転角度をいう。
キャップ1は、製造後、室温に3日間放置した後に、室温下で巻締め角度を測定した。
実施例1と同様のキャップ1を製造後、室温に3日間放置し、次いで加熱条件下(55℃)に24時間置いた後に、室温下でこのキャップ1の巻締め角度を測定した。その他の条件は実施例2と同様とした。結果を図5に示す。
比較例1と同様のキャップ51を製造後、室温に3日間放置した後に、室温下で巻締め角度を測定した。その他の条件は実施例2と同様とした。結果を図5に示す。
比較例1と同様のキャップ51を製造後、冬季環境下(平均気温10℃)に3日間放置し、次いで加熱条件下(55℃)に24時間置いた後に、室温下で巻締め角度を測定した。その他の条件は実施例2と同様とした。結果を図5に示す。
比較例1と同様のキャップ51を製造後、夏季環境下(平均気温40℃)に3日間放置し、次いで加熱条件下(55℃)に24時間置いた後に、室温下で巻締め角度を測定した。その他の条件は実施例2と同様とした。結果を図5に示す。
また、比較例2~4のなかでも、比較的高温の条件で放置した比較例4ではばらつきが大きくなった。
巻締め角度のばらつきは、滑剤のブリード量のばらつきを原因として生じたと考えることができる。
なお、滑剤とは、例えば炭化水素系の滑剤(流動パラフィンなど)、脂肪酸系の滑剤(高級脂肪酸など)、脂肪酸アミド系滑剤(脂肪酸アミドなど)、エステル系滑剤(脂肪酸の低級アルコールエステルなど)、アルコール系滑剤(脂肪アルコールなど)、金属石けん系滑剤などである。
2 天板部
2a 天板部の内面
3 筒部
10 ネジ部
12 内側シール突起
12a 当接凸部
12b 最大外径部
12e 基端部
12f 外面
13 開口端シール突起
14 外側シール突起
14a 内面
14d 最小内径部
14e 基端部
20 容器
21 口元部
21a 内面
21b 開口端面
21c 外面
24 容器本体
T2 外側シール突起の基端部から最小内径部までの範囲の平均厚さ
Claims (9)
- 炭酸飲料が充てんされた容器の口元部に装着される合成樹脂製キャップであって、
天板部とその周縁から垂下した筒部とを備え、
前記天板部の内面に、前記口元部内に嵌入される内側シール突起と、前記口元部の外面に当接する外側シール突起とが形成され、
前記内側シール突起の外面には、前記口元部の開口端部から容器本体側に離れた位置で、前記口元部の内面に当接して前記容器をシールする当接凸部が形成され、
前記外側シール突起は、先端に向けて内径が小さくなる内面を有し、
前記内面の下端である最小内径部が、前記口元部の開口端部から容器本体側に離れた位置で、前記口元部の外面に当接する炭酸飲料充てん容器用合成樹脂製キャップ。 - 前記外側シール突起の最小内径部は、前記内側シール突起の当接凸部の最大外径部より高い位置にある請求項1に記載の炭酸飲料充てん容器用合成樹脂製キャップ。
- 前記外側シール突起は、板状に形成されている請求項1または2記載の炭酸飲料充てん容器用合成樹脂製キャップ。
- 前記最小内径部と前記最大外径部との高低差は、2.5mm以下である請求項2記載の炭酸飲料充てん容器用合成樹脂製キャップ。
- 前記外側シール突起は、基端部から前記最小内径部までの平均厚さが0.5~2mmである請求項3記載の炭酸飲料充てん容器用合成樹脂製キャップ。
- 前記内側シール突起の基端部に近接した位置に、他の部分より厚みが薄い薄肉部が形成されている請求項1~5のうちいずれか1項記載の炭酸飲料充てん容器用合成樹脂製キャップ。
- 請求項1~6のうちいずれか1項記載の炭酸飲料充てん容器用合成樹脂製キャップであって、滑材が添加されていない炭酸飲料充てん容器用合成樹脂製キャップ。
- 炭酸飲料が充てんされる容器と、その口元部に装着される合成樹脂製キャップとを備えた閉止装置であって、
前記合成樹脂製キャップは、請求項1~7のうちいずれか1項に記載されている閉止装置。 - 炭酸飲料が充填された容器と、その口元部に装着される合成樹脂製キャップとを備えた飲料入り閉止装置であって、
前記合成樹脂製キャップは、請求項1~7のうちいずれか1項に記載されている飲料入り閉止装置。
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CN201280056115.1A CN103987629A (zh) | 2011-11-21 | 2012-10-10 | 碳酸饮料填充容器用合成树脂制盖、闭合装置及灌装饮料闭合装置 |
KR1020177005067A KR101989178B1 (ko) | 2011-11-21 | 2012-10-10 | 탄산음료 충전 용기용 합성 수지제 캡, 밀봉 장치, 및 음료가 든 밀봉 장치 |
RU2014124698/12A RU2587074C2 (ru) | 2011-11-21 | 2012-10-10 | Крышка из синтетической смолы для контейнера, наполненного газированным напитком, закрывающееся устройство и закрывающееся устройство, наполненное напитком |
AU2012341792A AU2012341792B2 (en) | 2011-11-21 | 2012-10-10 | Synthetic resin cap for carbonated beverage-filled container, closure device, and beverage-containing closure device |
KR1020147016048A KR20140091063A (ko) | 2011-11-21 | 2012-10-10 | 탄산음료 충전 용기용 합성 수지제 캡, 밀봉 장치, 및 음료가 든 밀봉 장치 |
US14/359,186 US10737846B2 (en) | 2011-11-21 | 2012-10-10 | Synthetic resin cap for carbonated beverage-filled container, closure device, and beverage-containing closure device |
MX2014004831A MX348016B (es) | 2011-11-21 | 2012-10-10 | Tapa de resina sintética para recipiente lleno con bebida carbonatada, dispositivo de cierre, y dispositivo de cierre que contiene bebida. |
IN4640DEN2014 IN2014DN04640A (ja) | 2011-11-21 | 2012-10-10 | |
PH12014501112A PH12014501112B1 (en) | 2011-11-21 | 2014-05-16 | Synthetic resin cap for carbonated beverage-filled container, closure device, and beverage-containing closure device |
ZA2014/04418A ZA201404418B (en) | 2011-11-21 | 2014-06-17 | Synthetic resin cap for carbonated beverage-filled container, closure device, and beverage-containing closure device |
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JP2011253824A JP5977937B2 (ja) | 2011-11-21 | 2011-11-21 | 炭酸飲料充てん容器用合成樹脂製キャップ、閉止装置、および飲料入り閉止装置 |
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EP (1) | EP2784001B1 (ja) |
JP (1) | JP5977937B2 (ja) |
KR (2) | KR20140091063A (ja) |
CN (1) | CN103987629A (ja) |
AU (1) | AU2012341792B2 (ja) |
CL (1) | CL2014001257A1 (ja) |
HU (1) | HUE038781T2 (ja) |
IN (1) | IN2014DN04640A (ja) |
MX (1) | MX348016B (ja) |
PH (1) | PH12014501112B1 (ja) |
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JP5977937B2 (ja) | 2016-08-24 |
MX2014004831A (es) | 2014-08-22 |
KR101989178B1 (ko) | 2019-06-13 |
AU2012341792B2 (en) | 2015-08-20 |
CL2014001257A1 (es) | 2015-01-16 |
AU2012341792A1 (en) | 2014-07-03 |
KR20170024139A (ko) | 2017-03-06 |
JP2013107677A (ja) | 2013-06-06 |
CN103987629A (zh) | 2014-08-13 |
KR20140091063A (ko) | 2014-07-18 |
PH12014501112A1 (en) | 2014-07-28 |
IN2014DN04640A (ja) | 2015-05-08 |
MX348016B (es) | 2017-05-23 |
EP2784001A1 (en) | 2014-10-01 |
RU2014124698A (ru) | 2015-12-27 |
EP2784001B1 (en) | 2018-06-20 |
US20140319144A1 (en) | 2014-10-30 |
RU2587074C2 (ru) | 2016-06-10 |
EP2784001A4 (en) | 2015-04-15 |
HUE038781T2 (hu) | 2018-11-28 |
US10737846B2 (en) | 2020-08-11 |
PH12014501112B1 (en) | 2014-07-28 |
ZA201404418B (en) | 2015-12-23 |
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