EP0070935A1 - Gewinde für Kunstharzverschlüsse - Google Patents

Gewinde für Kunstharzverschlüsse Download PDF

Info

Publication number
EP0070935A1
EP0070935A1 EP81303526A EP81303526A EP0070935A1 EP 0070935 A1 EP0070935 A1 EP 0070935A1 EP 81303526 A EP81303526 A EP 81303526A EP 81303526 A EP81303526 A EP 81303526A EP 0070935 A1 EP0070935 A1 EP 0070935A1
Authority
EP
European Patent Office
Prior art keywords
closure
thread
container
axial
sidewall
Prior art date
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.)
Withdrawn
Application number
EP81303526A
Other languages
English (en)
French (fr)
Inventor
Thurston H. Toeppen
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP81303526A priority Critical patent/EP0070935A1/de
Publication of EP0070935A1 publication Critical patent/EP0070935A1/de
Withdrawn legal-status Critical Current

Links

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
    • B65D41/0428—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

Definitions

  • Screw-type closures molded or resilient plastic materials such as polyethylene or polypropylene have been widely used for sealing metal, glass, and plastic containers holding a variety of products.
  • closures of this type have been of limited practicability for liquids under pressure, such as carbonated beverages.
  • This limitation is due not only to the permeability of the pliable materials used, and to the unavoidable inaccuracies of the mating parts, both of which become more critical with increasing pressure, but may also be the unwanted side-effect of some efforst to improve pressure retention.
  • screwing the closure more tightly onto the container may deform the thread so much that it will be difficult for the user to unscrew.
  • it may cause distortion of the closure, due to unbalanced loading of the screw thread, to the point t where leakage is actually increased.
  • a closure according to the invention is provided with an internal thread having a smaller axial pitch spacing than the mating external thread of the container, the difference between the two threads being designed to compensate for the normal variations in sidewall characteristics around the circumference of the closure. This will result in the more uniform application of axial sealing pressure at all points around the circumference of the sealing element, or elements, thereby maximizing the effectiveness of the closure seal and minimizing the influence of manufacturing irregularities.
  • the principal object of the invention is to provide improved sealing of resilient plastic screw-type closures when used in combination with relatively rigid containers.
  • Another object of the invention is to facilitate installation of the closure on the container by distributing thread friction more uniformly over the entire area of thread contact, in order to provide more consistent installation torque and to prevent localized stress concentrations which may lead to jamming of the thread and/or damage to the plastic.
  • Another object of the invention is to facilitate manual removal of the closure by preventing localized stress concentrations during installation and storage, which may so deform the closure thread as to impede the unscrewing operation.
  • the invention is embodied in a plastic, screw-type closure molded of polyethylene, polypropylene, or a similar resilient plastic.
  • the closure comprises a circular crown 1, a cylindrical sidewall or skirt 2 which is integral with the crown, an internal screw thread 3 to mate with a corresponding external thread 4 which is part of container 5, and external knurls or flutes 6 by which it may be gripped to rotate it on to or off of the container thread.
  • One or more circular sealing elements is provided, such as lip 7, to bear on the mating top surface 8 of the ' container.
  • the sealing element may consist of a raised bead or a shoulder, and may bear on the inner or outer corner of surface 8, or on both.
  • Container 5 is of a conventional style, and may correspond to any of a number of designs which have been standardized by agencies of the container industry. As shown in Fig. 1 it has the general conformation of a glass container, but may equally well be made of plastic or metal.
  • thread 4 in the figures is shown as if it consisted of exactly one turn, with the upper end 9 and lower end 10 of the thread shown at the left side of F ig. 1, and the midpoint 11 of the thread shown in section at the right side. In practice, such threads are usually longer; however, the principles of the invention are most clearly shown in the single-turn example. Thread 3 is understood to be long enough to provide full contact with thread 4 as the closure is rotated from the position of Fig. 1 to that of Fig. 2.
  • the axial spacing between successive turns of the same thread is known as the pitch, and is usually expressed either as the equivalent number of turns per inch or, conversely, as a certain fraction of an inch per turn. For example, a thread pitch equivalent to eight turns per inch would have an axial spacing between turns of one-eighth of an inch.
  • the axial pitch of the container thread is indicated by the dimension P 1
  • the slightly smaller pitch of the closure thread by the dimension P 2 . Since the closure of Fig. 1 is shown just at the stage in its rotation where the thread makes working contact with the container thread at point 12, the pitch difference between P 1 and P 2 will appear as an axial clearance at point 13. At the halfway point 14 of the thread turn, the axial clearance is half of that at 13. In Fig. 1, the clearances are exaggerated to emphasize the principles.
  • the thread contact pressure per unit of contact length, the tension per unit in the sidewall above the thread,and the seal pressure per unit of contact length will all be uniform around the closure.
  • the amount of divergence of the threads is designed to compensate for the changes in the effective length of the sidewall around the closure. Any additional tightening of the closure will increase all of the forces involved, but without significantly changing their relationship or their uniformity.
  • the exact amount of thread divergence required between P 1 and P 2 will vary according to the pitch of the container thread, the dimensions of the sidewall in the thread area, and the tension modulus, or extensibility, of the particular plastic used for the closure. It will also vary with the material and thickness of the container, but this effect is ordinarily so small that it can be neglected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
EP81303526A 1981-07-31 1981-07-31 Gewinde für Kunstharzverschlüsse Withdrawn EP0070935A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP81303526A EP0070935A1 (de) 1981-07-31 1981-07-31 Gewinde für Kunstharzverschlüsse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81303526A EP0070935A1 (de) 1981-07-31 1981-07-31 Gewinde für Kunstharzverschlüsse

Publications (1)

Publication Number Publication Date
EP0070935A1 true EP0070935A1 (de) 1983-02-09

Family

ID=8188361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303526A Withdrawn EP0070935A1 (de) 1981-07-31 1981-07-31 Gewinde für Kunstharzverschlüsse

Country Status (1)

Country Link
EP (1) EP0070935A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB788148A (en) * 1956-08-03 1957-12-23 Metal Box Co Ltd Improvements in or relating to closures for containers
GB876636A (en) * 1957-05-06 1961-09-06 Vaessen Schoemaker Holding Bv Screw type connections
GB1036399A (en) * 1965-02-22 1966-07-20 Metal Box Co Ltd Improvements in or relating to closures for bottles or the like
GB1082440A (en) * 1966-02-28 1967-09-06 Metal Box Co Ltd Improvements in or relating to closures for containers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB788148A (en) * 1956-08-03 1957-12-23 Metal Box Co Ltd Improvements in or relating to closures for containers
GB876636A (en) * 1957-05-06 1961-09-06 Vaessen Schoemaker Holding Bv Screw type connections
GB1036399A (en) * 1965-02-22 1966-07-20 Metal Box Co Ltd Improvements in or relating to closures for bottles or the like
GB1082440A (en) * 1966-02-28 1967-09-06 Metal Box Co Ltd Improvements in or relating to closures for containers

Similar Documents

Publication Publication Date Title
US4294370A (en) Threaded closure and container
US8991633B2 (en) Closure plug
US6913157B2 (en) Closure and container and combination thereof with anti-backoff member
RU2586473C2 (ru) Пластиковая крышка с улучшенными характеристиками
US7854106B2 (en) Gasket for press-on twist-off closure
US3511403A (en) Closures for bottles and the like
US3335923A (en) Angled seat closure
CA1282033C (en) Closures
US3045854A (en) Venting seal for a closure
EP0008926A1 (de) Schraubverschluss für Behälter
US4526284A (en) Plastic closure with sealing fin
EP1467922B1 (de) Verschlussstopfen
US4640430A (en) Screw caps for containers
US4231480A (en) Threaded bottle lid
AU2003202017A1 (en) Closure plug
EP0236127B1 (de) Behälterverschluss
US3017048A (en) Container closures
EP0070935A1 (de) Gewinde für Kunstharzverschlüsse
EP0232856B1 (de) Behälter
US4557394A (en) Lock arrangement for closures
IE41402B1 (en) Plastics closure bushing
EP0414860B1 (de) Schraubkappe aus kunststoffmaterial
US20020063104A1 (en) Thread formation for closure structures
ZA200405767B (en) Closure plug improvement
EP0662427B1 (de) Maschinell aufsetzbarer Kunststoff-Schraubverschluss

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840120