US3247993A - Plastic cap - Google Patents

Plastic cap Download PDF

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Publication number
US3247993A
US3247993A US357162A US35716264A US3247993A US 3247993 A US3247993 A US 3247993A US 357162 A US357162 A US 357162A US 35716264 A US35716264 A US 35716264A US 3247993 A US3247993 A US 3247993A
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United States
Prior art keywords
bead
cap
container
subportion
clamping
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US357162A
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English (en)
Inventor
Gelbjerg-Hansen Per
Meyendorff Holger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F G M and Co
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F G M and Co
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Filing date
Publication date
Application filed by F G M and Co filed Critical F G M and Co
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Publication of US3247993A publication Critical patent/US3247993A/en
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    • 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
    • B65D41/16—Snap-on caps or cap-like covers
    • B65D41/18—Snap-on caps or cap-like covers non-metallic, e.g. made of paper or plastics

Definitions

  • This invention relates to plastic caps for standard containers of the type provided with a container neck ending in an outwardly projecting annular convex container bead and particularly to such caps adapted to effect sealed clousure of a standard container of said type having contents, which set up excess pressurein the container, and comprising-a top plate, a downwardly extending skirt portion which through a curved transition portion merges into the top plate, and a head portion at the lower end of the skirt portion which head portion comprises an inner clamping bead and an outer supporting bead, whereas the skirt portion is so dimensioned that when the cap is applied to a container neck of the said type the skirt portion is stretched axially as well as circumferenitally.
  • the inner face of the skirt portion is provided with a thin filmlike coating of a material softer than the plastic material used for the cap, in which case such a cap is able to secure a proper seal even if the container neck head has an irregular outer surface.
  • caps of this type are provided with a heavy head portion the supporting head of which has the same height as the clamping head.
  • the head portion When such a cap is applied to,a container neck the head portion has to be dilated in a very high degree since the inner face of the clamping bead must be carried downwards along the outer side of the container neck head which 'has a major outer diameter much greater than the inner diameter of the clamping bead.
  • cap is applied by a pressure being exerted on the upper side of the supporting bead and at a relatively low speed, for example corresponding to the capping of about 5000 containers per hour, normally there will be no difliculties in applying the caps to the containers, but at higher speeds, for example corresponding to the capping of 10,000 to 15,000 containers per hour, too many caps are not correctly applied to the containers owing thereto that the bead portion of these caps have been deformed during the capping process.
  • An object of the present invention is to provide a cap of the type mentioned which can be applied to containers even at high speed without the caps being deformed unintentionally.
  • a further object of the invention is to provide a cap of the type mentioned, which has a smaller material consumption than the hitherto known caps of the type mentioned but nevertheless incurs the same advantages as to sealing effect and ability of withstanding high inner pressures in the containers.
  • Another object of the invention is to provide a cap of the type mentioned which when having once been removed from a container neck by means of a cap remover is able by hand again to be applied to a container neck and also during such reuse being able to seal against high excess pressures in the container and in spite of such 3,247,993 Patented Apr. 26, 196.6
  • FIG. 1 is a part sectional view on a large scale of a known plastic cap of the type referred to, on which some embodiments of the invention are shown in broken lines;
  • FIG. 2 is a part sectional view corresponding to FIG. 1 of a preferred embodiment of the invention.
  • FIGS. 3 and 4 are corresponding sectional views of the cap shown in FIG. 2 and the upper part of a corresponding bottle neck during and after the capping process respectively;
  • FIG. 5 is a part sectional view corresponding to FIG. 1 of a further embodiment of the invention.
  • FIG. 1 shows with solid lines a bottle cap known per se and comprising a top plate portion 10 which merges into an intermediate portion which includes a curved transition portion 16 and an approximately cylindrical unslit skirt portion 12.
  • the skirt portion 12 continues at its lower end into an elongated continuous annular bottom or bead portion 14.
  • the skirt port-ion 12 has a thickness t'srnaller than the thickness T of the top plate 10.
  • the curved transition portion 16 provides an even transition of thickness between the skirt portion 12 and the top plate 10.
  • the caps are made from an ethylene-propylene co-polymer having a tensile strength of about 250 kg./cm. and a resiliency corresponding to a Youngs modulus of about 056x10 kg] cm.
  • the cap dimensioned as appears from FIG. 1 and the outer diameter of the skirt portion 12 is 26.4 mm.
  • the cap will have a weight of about 1.6 g., and when such a cap is applied to a test-neck, that is a bottle neck made from steel and having exactly the standard dimensions of a standard bottle neck of the type shown in FIGS. 3 and 4, the cap will stand an inner excess pressure of 17 to 18 atm. It has to be observed, a cap which has to be used in connection with beer and mineral water must, when applied to a test-neck, stand an inner excess pressure of at least 12 atm. without leaking andwithout being blown off.
  • the supporting head 20' is thus designed that its upper face follows the broken line 49, the bottle neck will influence the bead portion 14 in such a manner that instead of under radial widening to turn outwards and upwards, still under radial widening the bead portion 14 will turn inwards with its lower end owing thereto that the bottle neck influences the inner side of the clamping bead 24, and the inwards swinging is made possible owing to the relatively short distance between the place 42 and the upper surface 38 of the clamping head 24.
  • the skirt portion 12 will, instead of with its lower end under radial widening to curve concavely outwards, with its lower end curve inwardly so that during the capping process the lower part of the skirt portion 12 is curved approximately corresponding to the curved form it adapts when the cap is applied to the bottle neck.
  • the intermediate portion 16, 12 is thus upon mounting onto the bottle 60 (FIG. 3) being stretched longitudinally and circumferentially and therefore in all directions and is thereby molded sealingly in fitted position to the bottle bead.
  • the inwards curving of the bead portion 14 involves that the resistance against the introduction of the bottle neck into the cap is reduced.
  • the clamping head 24 will during the applying of the cap to the bottle neck be brought to curve inwards in a still greater degree than the supporting bead 20 since owing to the short distance between the place 42 and the line 28 the supporting bead 20 will be able to swing somewhat outwards relative to the clamping bead 24. Owing thereto the forces necessary for providing the stated swinging of the head portion 14 and thereby the deformation stresses influencing the clamping bead 24 will be further reduced.
  • the clamping bead 24 When the bottle cap is applied to the bottle neck the clamping bead 24 will penetrate into the groove below the bottle .neck bead and the transition line 34 will adopt a position approximately corresponding to the transition between the outer and lower side of the bottle neck bead.
  • the supporting head 20 will tend to contract to adopt its original size, and thereby it generates a
  • the clamping bead 24 will cause an inwards directed shrinking. pressure too,
  • FIGS. 2 to 4 A preferred embodiment of a cap according to the present invention is shown in FIGS. 2 to 4.
  • the top plate 10, the skirt portion 12, the curved transition portion 16, the upper face 38 of the clamping bead 24, and, thereby, the transition lines 34 and 36 are formed, dimensioned and arranged in the same manner as the corresponding portions of the known cap shown in solid lines in FIG. 1.
  • the inner face 44 of the clamping bead 24 has a relatively small height and merges through a comparatively sharp transition 46 into a conical lower face 48 simultaneously forming the inner side of the lower part of the supporting bead 20.
  • the supporting head 20 a is provided with an upper face 50 which through a concave curvature 52 having a radius of curvature at least equal to the thickness 2 of the skirt portion 12, preferably about 1.5 X t, merges into the downwards extension of the outer surface 22 of the skirt portion at a transition line 54 having a distance from the lower rim 58 of the bead porlower side of the supporting bead forms the lower rim 58 i of the beadportion 14 and is, as norm-ally is the case, horizontal, provided the axis of the cap is vertical.
  • caps as the one shown in FIG. 2 are able on test-necks to stand an excess pres sure of about 16 atm., that is only 1 atmless thanthe;
  • FIG. 3 shows the deformation of the cap shown in FIG.
  • FIG. 3 the cap is shown in the position it takes up when the widening of the head portion 14 is greatest.
  • FIGS. 2 and 3 it appears that the cap must take up the position shown in FIG. 3, and also that by the shape shown in FIG. 3 the cap will olfer only a slight resistance against its application when the cap is applied to the bottle neck by means of a device providing a vertical pressure on the upper side 50 of the supporting bead 29.
  • FIG. 4 shows the cap of FIG. 2 applied to the bottle neck 60. From this figure it appears that the supporting bead must exert an inwards directed bending moment on the clamping bead 24. It also appears how, owing to the deformation, the lower side 58 of the bead portion 14 gets comical tapered inwards and upwards causing that the inner tongue of a normal bottle opener easily may slide in below the lower side 58 and grasp this side. From this figure also appears why the radius of curvature of the curved portion 52 must be comparatively great.
  • the supporting bead 20 would mainly when acted upon by an opener be swung outwardly about the transition 54 without directly to act upon the clamping bead 24, so that only the supporting effect of the supporting bead subportion 2% on the clamping bead subportion 24 would be reduced.
  • the pressure within a bottle containing beer or mineral water will be essentially lower than the pressure which may arise within the bottle, for example during pasteurization or when the bottle is shaken, and, therefore, a reduction of the effect of the supporting bead on the clamping bead will normally not be sufi'lcient for removing the cap.
  • the curved portion 52 has a comparatively great radius of curvature, as shown, the swinging of the supporting bead by means of an opener will also incur an outwards swinging of the clamping bead so that the cap is easy to remove when it is wanted.
  • the corresponding transition ought to have a very small radius of curvature since otherwise by this embodiment the axial pull forces in the 'skirt portion 12 will tend to swing the supporting bead outwards and thereby to reduce its effect on the clamping bead.
  • the intermediate portion 16, 12 is sealingly held against the bottle head by clamping bead subportion 24 having an embracing surface 38 which surroundingly embraces the underside of the bottle closure bead.
  • FIG. 5 A special embodiment of the cap according to the invention is shown in FIG. 5.
  • the cap shown in FIG 5 differs from the cap shown in FIG. 2 only by the shape of the supporting bead which by the embodiment shown in FIG. 5 outwardly is limited only by a conical surface 62 which merges with the continuation of the outer surface of the skirt portion 12 at the transition 54 situated opposite the inner surface 44 of the clamping bead 24 on a level between the levels defined by the transition lines 36 and 46.
  • This embodiment may be applied to the bottle neck by means of a capping device of the same type which is used for capping metallic caps of the crown type and comprising an inwardly conical piston.
  • the comparatively weak dimensioned supporting head 21 will by this embodiment have the same effect as explained above, but this eflect will in this embodiment be further assisted thereby that during the capping process the supporting head 20 will receive a a permanent deformation and be pressed into the groove below the bottle neck head so thatwhen the cap is applied to the bottle neck the outer surface 62 of the supporting head will take up a nearly vertical position.
  • the supporting bead is cheap to produce, but at least when made by a usable plastic material of the types hitherto known owing to the permanent deformation of the supporting bead when the cap is applied to a bottle neck the supporting bead will get another appearance than the other parts of the cap.
  • the plastic material is coloredthe supporting head 20 will be lighter than the other parts of the cap with a white or grey tinge, and in case the plastic material is colorless or white the supporting head will be grey. Therefore, for the time being a cap as shown in FIG. 5 will possibly be of no practical interest, but it is possible that new plastic materials or new dye stuffs for plastic materials will appear making it possible to avoid the changing in appearance of the deformed supporting head 20.
  • the cap according to the invention implies several advantages such as a smaller weight and thereby a smaller 7 material consumption, a secure application even by great speed, and an easy removing by means of the hitherto normally used bottle openers whereas the known plastic caps demand a specially formed opener.
  • the new cap has shown to possess a quality implying an essential advantage at least for the users of bottles closed by such caps. It appears that even though a cap as the one shown in FIG.
  • the distancebetween the rim 58 and the place 54 whet the supporting bead merges with the extension of the outer surface of the skirt portion 12 may vary within great limits although as appears from the foregoing it has to be smaller than the distance between the rim 58 and the transition line 36.
  • the distance between the rim 58 and said place 54 is between 0.5 and 0.75 times the distance between the rim 58 and the transition line 36.
  • a container closure adapted to be fitted upon a container closure head at the open top by stretching comprising a plastic continuum, said continuum being shaped into portions to provide means as follows viewing the closure placed in operative position atop a container:
  • said supporting bead subportion extending outwardly relative to the outer surface of said skirt and being located below the embracing surface of said clamping bead subportion and being stretched circumferentially generating a shrinkage force
  • said third means bead at its lower end exerting said shrinking force biasing inwardly and upwardly the upper section of said clamping bead subportion having said embracing surface.
  • a container closure according to claim 1, wherein the supporting bead subportion merges with said intermediate portion at the outer surface thereof at a distance from the bottom of said supporting bead subportion ranging from about 0.5 to about 0.75 of the distance between said bottom of said supporting bead subportion and said embracing surface.
  • said supporting head subportion extending outwardly relative to the outer surface'of said skirt and being located below the embracing surface of said clamping bead sub-, 1 portion and being stretched circumferenferentially generating a shrinking force, said third means bead at its lower end exerting said shrinking force biasing inwardly and upwardly the upper section of said clamping bead subportion having said embracing surface.
  • a container closure according to claim 1 having 1' 0n the inner surface of said intermediate portion a thin film coating of a material softer than the material of said lastic continuum.
  • a container closure according to claim 3 having on the inner surface of said intermediate portion a thin film coating of a material softer than the material of said plastic continuum, whereby said closure retains its sealing capacity when said container head has been injured prior to closure.
  • a closure according to claim 1 wherein the plastic continuum is selected from a polymer or copolymer of ethylene and propylene.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
US357162A 1963-04-03 1964-04-03 Plastic cap Expired - Lifetime US3247993A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK155063AA DK114113B (da) 1963-04-03 1963-04-03 Flaskekapsel af eftergivende formstof.

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866783A (en) * 1973-05-29 1975-02-18 California Plastics Inc Closure for water bottle
US4093095A (en) * 1976-02-27 1978-06-06 Societe Nouvelle De Bouchons Plastiques S.N.B.P. Stopper-covering capsule for a bottle
US4580692A (en) * 1985-05-29 1986-04-08 Aluminum Company Of America Container sealing cap
US4961510A (en) * 1989-10-13 1990-10-09 Frank Dvoracek Sanitary lid for metal beverage container
US5123555A (en) * 1991-05-01 1992-06-23 Cap Snap Co. Container cap having external bead

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1013553A (fr) * 1950-01-13 1952-07-30 Perfectionnements aux capsules de fermeture pour récipients
FR1091781A (fr) * 1953-10-14 1955-04-14 Bouchon réemployable en matière thermo-plastique pour la fermeture hermétique de bouteilles ou autres récipients, procédé pour sa pose, et dispositif pour la mise en oeuvre de ce procédé
US2958439A (en) * 1959-04-29 1960-11-01 Donald E Yochem Container and closure
FR1258216A (fr) * 1957-10-03 1961-04-14 Capsule de bouchage perfectionnée
US2987206A (en) * 1959-03-30 1961-06-06 Grussen Jean Plastic cap for containers
US2990076A (en) * 1958-04-11 1961-06-27 Morton B Stull Closure cap and container neck construction
GB880047A (en) * 1958-09-16 1961-10-18 Gelbjerg Hansen Bottle caps
US3116846A (en) * 1959-12-10 1964-01-07 Pasinvest Ets Bottle closure

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1013553A (fr) * 1950-01-13 1952-07-30 Perfectionnements aux capsules de fermeture pour récipients
FR1091781A (fr) * 1953-10-14 1955-04-14 Bouchon réemployable en matière thermo-plastique pour la fermeture hermétique de bouteilles ou autres récipients, procédé pour sa pose, et dispositif pour la mise en oeuvre de ce procédé
FR1258216A (fr) * 1957-10-03 1961-04-14 Capsule de bouchage perfectionnée
US2990076A (en) * 1958-04-11 1961-06-27 Morton B Stull Closure cap and container neck construction
GB880047A (en) * 1958-09-16 1961-10-18 Gelbjerg Hansen Bottle caps
US2987206A (en) * 1959-03-30 1961-06-06 Grussen Jean Plastic cap for containers
US2958439A (en) * 1959-04-29 1960-11-01 Donald E Yochem Container and closure
US3116846A (en) * 1959-12-10 1964-01-07 Pasinvest Ets Bottle closure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866783A (en) * 1973-05-29 1975-02-18 California Plastics Inc Closure for water bottle
US4093095A (en) * 1976-02-27 1978-06-06 Societe Nouvelle De Bouchons Plastiques S.N.B.P. Stopper-covering capsule for a bottle
US4580692A (en) * 1985-05-29 1986-04-08 Aluminum Company Of America Container sealing cap
US4961510A (en) * 1989-10-13 1990-10-09 Frank Dvoracek Sanitary lid for metal beverage container
US5123555A (en) * 1991-05-01 1992-06-23 Cap Snap Co. Container cap having external bead

Also Published As

Publication number Publication date
DK114113B (da) 1969-05-27
DE1432160A1 (de) 1969-04-10

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