Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
  • B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
  • B67B3/00—Closing bottles, jars or similar containers by applying caps
  • B67B3/02—Closing bottles, jars or similar containers by applying caps by applying flanged caps, e.g. crown caps, and securing by deformation of flanges
  • B67B3/10—Capping heads for securing caps
  • B67B3/18—Capping heads for securing caps characterised by being rotatable, e.g. for forming screw threads in situ
• • 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
  • B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
  • B65D41/045—Discs
• • 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
  • B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
  • B65D41/0464—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements the screw-thread or the like being formed by conforming the cap-skirt to the thread or the like formation on 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
  • B65D51/00—Closures not otherwise provided for
  • B65D51/16—Closures not otherwise provided for with means for venting air or gas
  • B65D51/1672—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by manual actuation of the closure or other element
  • B65D51/1688—Venting occurring during initial closing or opening of the container, by means of a passage for the escape of gas between the closure and the lip of the container mouth, e.g. interrupted threads

Definitions

• the present invention relates to screw closures for containers having externally screwthreaded necks and in particular to screw closures of the type in which the thread is rolled in situ by inwardly deforming the skirt of a cup-shaped metal blank between adjacent turns of the screw thread on the container neck.
• the invention is also concerned with apparatus for applying the closure blanks to such containers,
• a screw-capped bottle containing a carbonated beverage is susceptible to release a large quantity of carbon dioxide from solution as a result of shaking. As discussed in British Patent
• the neck of the bottle or other container is preferably provided with at least one vertical groove, forming a notch through each turn of the container thread to form a gas escape passage, which becomes particularly effective when it is brought into register with like notches in the cap. thread.
• the closure thread is normally formed by pressing at least one free-turning roller against the closure skirt, the rollers being narrow and deforming the metal, generally aluminium, into the valleys between the neck threads and being arranged to follow such threads. As the roller is rolled around the closure, it follows the neck thread down and runs out at the bottom of the neck thread, leaving the closure firmly engaged with the neck thread.
• a method of securing a cup-shaped metal closure blank to a container having an externally screw-threaded neck comprising placing the blank over the container mouth and pressing it down against the container mouth to close and seal the mouth and deforming the skirt of the blank inwardly between adjacent outwardly-projecting thread formations on the container neck to produce inwardly-projectingthread formations in said thread is characterised by interrupting said inward deformation at one or more positions to define a notch or notches in such inwardly-projecting thread formations.
• the cut-out or cut-outs in the roller or rollers may be of various shapes, for example semi-circular, vee or rectangular.
• the corners of the cut-outs may be sharp corners or radiused.
• a plurality of thread-forming rollers are used, with the rollers arranged around the axis of rotation of the headset in such manner that the radial forces with which they are urged against the closure are balanced.
• a plurality of notched thread-forming rollers may be geared, or otherwise ganged to turn in synchronism with each other about their respective axes, to ensure that the notch or notches left by one roller are not rolled out by the next roller, but rather that a cut-out in the next roller registers with the previously-left interruptions in the thread.
• a single notched- thread forming roller may be employed together with one or more tuck-under rollers so positioned to balance the roller forces.
• a further alternative is to oppose a single thread-forming roller by one or more plain rollers which bear against the closure skirt over the apices of adjacent projecting container thread formations and thus do not deform the closure skirt inwardly between said formations.
• a further alternative is to rely upon the pressure block, which is strongly urged onto the top of the closure, to resist the thread-roller force.
• Figure 1 is a side view of a notched thread closure cap on a bottle neck
• Figure 2 is a vertical cross-section through half of the closure cap and the bottle neck on line 2-2 of Figure 1.
• Figure 3 is a vertical cross-section showing the closure cap partially unscrewed and a closure thread notch bridging the gap between the top two ridges of the neck thread;
• Figure 4 is a vertical cross-section similar to Figure 3 showing the thread notch in alignment with two aligned neck thread notches;
• Figure 5 shows a diagrammatic view of a pilfer-proof closure cap immediately before commencement of sealing to a bottle by a sealing machine
• Figure 6 is a plan view of the notched-thread forming roller of the sealing machine.
• the cap of Figure 1 has a skirt 2 in which is rolled a thread 3 having notches 4, which may be aligned as shown or displaced from each other. Preferably there are notches 4 at two or more positions in each turn of the inwardly directed thread.
• the cap has a rolled bead 5 and a knurled grip 6.
• the cap is provided with a layer 8 of gasket material which covers the top 7 and extends onto the upper portion of the skirt 2 to form a sealing gasket.
• the cap is deformed at 9 during application of the blank to the container 10, which may be of plastics material or of glass, by a pressure block 11, see Figure 5, to seal on the outer cylindrical, surface 12 ( Figure 2) of the container adjacent the mouth 13.
• Figure 2 Also shown in Figure 2 is the thread form of both the neck thread 14 and the rolled cap thread 3. On initial application the thread 3 is held in close contact with the underside of the neck thread 14 by the upward thrust due to the gas pressure exerted by the contents of the bottle.
• Figure 3 shows a section at a skirt thread notch 4 with the cap partially unscrewed, with a notch 4 bridging container threads 14.
• a limited escape of gas pressure can now take place over the apices 17 of the individual neck threads 14 and through the notch 4 in the still engaged skirt thread.
• a thread notch 4 is in register with vertically aligned notches 18 in the individual neck threads 14. When this alignment occurs a very rapid blow-off of gas can take place.
• Figure 5 shows the blank 21 of a pilfer-proof cap at the start of application to the neck of a blow-moulded plastic bottle 30 by a sealing machine which includes a support 22 on which an integral bottle collar 31 rests, because the bottle body cannot withstand heavy axial pressure exerted by a conventional two-part pressure block 11.
• the block 11 is urged downwards in the direction of arrow 23 to press the closure blank against the bottle mouth and to deform the closure at 9 to establish a seal with the cylindrical surface on the bottle neck.
• a thread roller 24 is mounted in conventional manner to turn about the axis of the headset of which the pressure block 11 also forms part.
• roller 24 and an opposed tuck-under roller 25 for the security band 26 of the closure are mounted on lever arms (not shown) for movement towards and away from the bottle neck to balance the forces with which the rollers are urged in the direction of arrows 27.
• lever arms not shown
• the rollers 24, 25 are mounted in the conventional way on pivoted arms and are moved Inwards in the direction of the arrows 27 by conventional spring, hydraulic or pneumatic means to press against the skirt of the closure blank.
• the thread-:forming roller 24 runs down the closure skirt in the trough between adjacent turns of the bottle thread 14 to deform the skirt into engagement with the thread 14 and to form the cap thread 3.
• the support 22 would be eliminated and the bottle supported on a table or the like in the conventional manner.
• the headset is employed to apply conventional plain closure blanks, having an outwardly curled bead at the bottom margin of the skirt, the tuck-under rollers are preferably replaced by plain rollers having a cylindrical profile to counteract the thread roller 24.
• the thread roller 24 has a number of notch-forming cut-outs 28.
• the diameter of the thread roller need have no particular relationship to the diameter of the closure or bottle neck and indeed will be employed in practice (with suitable change of pressure block and other items) to apply closures to bottle necks of different diameter. It is however necessary that the peripheral distance between adjacent cut-outs 28 is no more than the circumference of the neck to which a closure is applied to ensure that there Is at least one notch in each turn of the neck thread.
• the closure/container combination illustrated in the accompanying drawings may be varied In a number of details. As already indicated it is not essential to provide any notch In the container thread.
• notches are provided in such container thread, they may be aligned in the vertical direction as shown in Figure 4 or may be arranged at intervals along the length of the helical container thread so as not to be in vertical alignment. Similarly the notches in the closure thread may be vertically aligned as shown In Figure 1. However, where such notches are formed by the thread roller of Figure 6, the spacing between the notches is dependent upon the relationship between the container neck circumference and the peripheral distance between adjacent notches 28 in the roller periohery. In many instances the closure thread notches will be at staggered intervals around the container neck.
• the roller 24, shown in Figure 5 may be mounted on arms which pivot about a vertical axis, parallel to the axis of the pressure block 11. The same modification may be made with respect to the mounting of the tuck-under rollers 25 or plain rollers which may replace the rollers 25.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Closures For Containers (AREA)
• Vacuum Packaging (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10520172

Family Applications (1)

Country Status (10)

Families Citing this family (4)

Citations (1)

• 1982
  • 1982-03-02 AU AU81000/82A patent/AU8100082A/en not_active Abandoned
  • 1982-03-02 EP EP82301053A patent/EP0060073A1/en not_active Withdrawn
  • 1982-03-04 ES ES510145A patent/ES8306675A1/es not_active Expired
  • 1982-03-04 ZA ZA821437A patent/ZA821437B/xx unknown
  • 1982-03-05 WO PCT/GB1982/000073 patent/WO1982003059A1/en active Application Filing
  • 1982-03-05 JP JP57500812A patent/JPS58500364A/ja active Pending
  • 1982-03-05 AR AR288640A patent/AR230245A1/es active
  • 1982-03-05 PT PT74542A patent/PT74542B/pt unknown
  • 1982-10-25 NO NO823541A patent/NO823541L/no unknown
  • 1982-11-04 DK DK489582A patent/DK489582A/da not_active Application Discontinuation

Patent Citations (1)

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