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

Definitions

• the invention relates to a container screw cap made of plastic, which is provided on the inside of its lid base with an annular sealing lip, which seals when the cap is screwed onto the container mouth against its cylindrical inner side.
• the circumferential ring sealing lip is relatively stiff, which means that when the ring sealing lip contacts the inner edge of the container mouth, depending on the shape of the ring sealing lip, a more or less large counterpressure builds up, which leads to closure problems can, because it can prevent or impede proper immediate engagement of the screw cap internal thread with the container thread.
• the contact pressure per unit area is reduced as a result of the compression of the ring lip to a wider ring surface.
• screw caps are also known, in which the circumferential ring sealing lip is at a relatively large distance from the cylindrical inside of the container mouth and is relatively high and is provided with an extension which faces the inside of the container mouth and which, when the screw cap is screwed on, by engagement with the inside edge of the Container mouth is bent upwards and is clamped between the cambered sealing lip and the container mouth.
• the lower end of the ring sealing lip comes into engagement with the container mouth (cf. GB 2 022 063 A).
• the sealing effect depends on the exact dimensions of the sealing lip and also requires a relatively rigid extension, so that the problems described occur again.
• the invention therefore aims to provide a screw cap with an annular seal on the cap base that seals against the inside of the container mouth, in which not only a perfect seal but also problem-free screwing on of the cap or reclosing of the container is ensured.
• the closure cap is characterized in that the ring sealing lip, which has a predetermined bending stiffness and has a radial distance to the inside, is assigned an annular rib which extends away from the inside of the cap bottom with a cross-section tapering downwards and is less in height than the sealing lip and when screwed on the screw cap comes into engagement with the ring sealing lip in order to press it against the inside of the container mouth.
• This design makes it possible to design the ring sealing lip and thus its pretension to be weaker than in the case of the seals according to the prior art, so that when the ring sealing lip engages with the container mouth there are no high counterforces caused by compression of the ring sealing lip.
• the ring sealing surface can only be slightly deformed or widened, i.e. the ring sealing surface can be chosen narrower. Only in the final phase of the closing process is the full contact pressure built up by the radially inner annular support rib. In the construction according to the invention, the sagging of the cap base in the shoulder area of the ring sealing lip is largely reduced and is therefore not subject to large fluctuations at high pressures, as was previously the case. In addition, the lower deflection of the cap base improves the resistance to stress cracking.
• the ring sealing lip has a vertical inside, a radially outwardly bulging upper outer wall section and a lower outer wall section which extends conically downwards and inwards.
• the ring rib that comes into engagement with the ring sealing lip has a vertical outside and ends in the region of the greatest radial extension of the ring sealing lip.
• FIGS. 4 and 5 a part of the screw cap according to the invention and a container neck also in axial section in two cap application positions
• FIGS. 6 and 7 details of two further embodiments men of the screw cap according to the invention.
• a plastic, e.g. Screw cap 1 produced by injection molding for a container mouth 2 has a casing 3 and a base 4.
• the cap jacket 3 has on its inside a thread 5, by means of which the screw cap
• the bottom 4 of the screw cap 1 has on its inside in the area of the inside edge 2 'of the container mouth a circumferential ring sealing lip 7 which protrudes downwards in one piece from the bottom 4 and in the axial section in the undeformed state a vertical inside 7', one radially outwards bulging upper outer wall section 7 "and has a conically lower and inner lower outer wall section 7" '.
• the ring sealing lip 7 thus merges into the bottom 4 via a weakening section.
• the ring sealing lip 7 comes with its conical outer wall section 7 "'which runs obliquely inwards and with its curved outer wall section 7" when the screw cap 1 is screwed on before the thread engagement with the in ⁇ Nenkante 2 'in contact and is deformed when it is immersed in the cylindrical inside 2 "of the container mouth 2 by upsetting such that a relatively wide ring zone s results as a sealing surface to the inside 2" of the container mouth 2. Given a stiffness of the material of the screw cap, the contact or sealing pressure per unit area is reduced. In the embodiment according to the invention shown in FIGS.
• a circumferential annular rib 8 which tapers downward from the bottom and has a substantially vertical outside, is formed with a radial distance from the circumferential sealing lip 7 to the bottom 4 of the screw cap 1 .
• the ring rib 8 has a significantly lower height than the sealing lip 7, for example approximately half the height thereof.
• the sealing lip 7 is weaker compared to the prior art, which has the result that it presents less resistance when immersed in the container mouth 2 and is less or hardly compressed. The sealing lip 7 therefore dips more gently or softer than according to the prior art. For this reason, the ring sealing surface s 1 can be chosen narrower, which also affects the lip cross section.
• the rounding radius of, for example, R 0.5 selected for a sealing lip 7 with a round outer shape in the example shown in FIG. 7 could also be chosen smaller or the lip could have a relatively angular profile, as shown in FIG. 6, as a result of which the contact pressure per mm 2 would increase.
• the sealing effect comes from the fact that the sealing lip 7 in the final phase of the screw-on process in the area of its greatest radial extent with the lower end of the ring rib 8, which is much stiffer as a result of its conical design and lower height and thus acts as a support and which engages the sealing lip 7 against presses the inside 2 "of the container mouth 2.
• the lower end of the ring rib 8 lies approximately at the level of the engagement of the sealing lip 7 on the container.
• FIGS. 3 to 5 show, the bottom 4 of the screw cap is supported with an essentially cylindrical ring rib 9, which is located at a radial distance outside the sealing lip 7, in the closed state on the upper side of the container mouth 2.
• the ring rib 8 and the cap bottom 4 are supported, for example, by 16 ribs 8 '. stiffened, which the contact pressure to the Ringdic Strengthen and increase the stress crack resistance of the cap bottom.
• relatively hard plastics can also be used as the cap material, because the necessary flexibility of the seal is guaranteed. This advantageously results in a reduction in weight and a higher production output.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=3515553

Family Applications (1)

Country Status (10)

Families Citing this family (2)

Family Cites Families (6)

• 1995
  • 1995-09-14 AT AT0153295A patent/ATA153295A/de not_active Application Discontinuation
• 1996
  • 1996-05-10 WO PCT/EP1996/001986 patent/WO1997010154A1/de not_active Application Discontinuation
  • 1996-05-10 PL PL96325523A patent/PL325523A1/xx unknown
  • 1996-05-10 ES ES96919751T patent/ES2118675T1/es active Pending
  • 1996-05-10 AU AU58172/96A patent/AU5817296A/en not_active Abandoned
  • 1996-05-10 HU HU9900345A patent/HUP9900345A2/hu unknown
  • 1996-05-10 CZ CZ98706A patent/CZ70698A3/cs unknown
  • 1996-05-10 EP EP96919751A patent/EP0850176A1/de not_active Ceased
  • 1996-05-10 SK SK348-98A patent/SK34898A3/sk unknown
• 1998
  • 1998-03-06 NO NO980990A patent/NO980990D0/no unknown

Non-Patent Citations (1)

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