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
  • B65D51/00—Closures not otherwise provided for
  • B65D51/16—Closures not otherwise provided for with means for venting air or gas
• • 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
  • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
  • B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
• • 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
  • B65D41/10—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts
• • 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
  • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
  • B65D53/04—Discs

Definitions

• the invention relates to a closure for a container, especially a bottle, comprising an upper covering panel and a circumferential collar or skirt adjoining the covering panel on the outside, wherein a sealing insert or liner is arranged on the underside of the covering panel which has a circumferential profile seal along the outside periphery.
• a closure is also known as (closure) lid or (closure) cap.
• the closure within the scope of the invention is especially a bottle closure which can be constructed for example as a crown cork closure or a tear- off closure. These closures are sealed to the container by a crimping operation. In both cases, the upper covering panel of the closure incorporating the profile seal is pressed against the bottle top at the sealing of the closure on the bottle.
• the circumferential band or collar which forms a cylindrical closure skirt embraces the bottle neck bead after sealing and the lower part of the skirt provides a firm grip under the bead ring.
• the skirt is provided with the usual crown cork stamping or teeth with the corrugations pressed against and slightly in under the bead ring, giving the appropriate grip.
• Crown cork closure means standard crown corks to be opened with a tool as well as twist crown corks that can be unscrewed by hand at opening or bent off with tool like standard crown cork.
• the skirt is crimped in under the bead ring and a tear-off strip is provided, which is defined by score lines in the covering panel and the skirt wherein this tear-off strip continues as a tongue protruding beyond the skirt and a pulling member, e.g. a pull-ring, is connected to this tongue.
• Bottle closures are known in a wide range of embodiments both as crown-cork closures and as tear-off closures.
• a constant problem is the handling of carbonated liquids in bottles.
• the bottles In order to ensure a high and constant quality of carbonated beverage for example, the bottles must be securely closed with the provided closures eliminating leakage of carbonisation.
• considerable internal pressures can occur in bottles filled with carbonated liquids.
• Such high internal pressures can especially occur when the filled and closed bottles are exposed to high temperatures and/or violent movements, e.g. during transport.
• Considerable problems can arise therefrom since at such high pressures there is the risk that the bottles, whether these are made of glass or plastic, will explode or burst.
• a considerable risk of injury is associated therewith for the user or neighbouring third parties.
• venting plastic closure comprising an outer plastic cap having a top wall portion and annular skirt portion.
• the skirt portion includes at least one internal thread formation, so that the closure is constructed as a screw cap to be screwed onto a threaded container.
• venting plastic closure includes a disk-shaped sealing liner positioned adjacent the inside surface of the top wall portion of the closure cap.
• the sealing liner can be compression moulded within the outer closure cap during closure manufacture and is configured for effecting a so-called "top/inside seal" with the associated container.
• the sealing liner includes a depending annular sealing bead portion having a generally downwardly and outwardly facing sealing surface.
• the outer closure cap includes an annular liner support element depending from the inside surface of the top wall portion.
• the liner support element is positioned within the annular sealing bead of the liner and defines a liner support surface positioned inwardly of and generally parallel to sealing surface of the liner.
• the liner support element cooperates with the sealing bead of the sealing liner to effect sealing engagement of the sealing bead with the surface of the associated container and also desirably reduced the quantity of relatively expensive liner material employed in the closure.
• the outer closure cap includes positive stop elements depending from the inside surface of the top wall portion. The stop elements can be positioned radially outwardly of sealing liner. The closure should facilitate removal and venting of internal gas pressure by obviating problems associated with over-application of the screw cap closure.
• GB 960 296 discusses a very special ventable milk bottle cap moulded of thin, sheet plastics material for application to milk bottles having an external bead at top edge thereof.
• GB 958 417 A shows a cap closure for the neck of a bottle or similar container, which cap closure is moulded from synthetic thermoplastic material as a unitary structure. It is used for gas producing liquids like bleach.
• US 3 741 423 A discloses a special type of closure cap for food products to be kept under vacuum.
• the closure cap includes an annular container engaging gasket applied over a substantial portion of the cap skirt and extending inwardly over the bottom cap cover beyond the inner edge of the container rim.
• a portion of the skirt portion of the gasket is caused to bulge inwardly into a number of slots in the glass finish thereby forming lug-like cap anchoring projections to retain the closure cap on the container.
• the object of the invention is to provide a closure for a container, especially a bottle closure, which can not only be used universally on conventional bottle neck beads and is simple and cheap to manufacture and seal but in addition, on reaching a predicted inner pressure makes it possible to achieve a specific release of pressure and subsequent problem-free reclosure.
• the invention defines and instructs that the upper covering panel has on its underside (facing the sealing insert) at least one projection, e.g. embossing, extending at least over a predefined angular region, which projects in the area of or close to the profile seal and interacts therewith forming a venting valve.
• the upper covering panel has on its underside an annular sealing liner located peripherally with an outer protrusion adjoined inside with a lower and wider ring, in combination, constituting a liner configuration ("profile seal") being designed to interact with a defined embossing, stamping or shaping of the upper covering panel, thereby forming a venting valve.
• the invention starts from the knowledge verified by experiments that the function of the seal can be specifically influenced if the covering panel is provided with an underside projection, e.g. embossing, stamping, moulding in connection with the area of the profile seal and constructed to interact with the profile seal.
• an underside projection e.g. embossing, stamping, moulding in connection with the area of the profile seal and constructed to interact with the profile seal.
• Position, shape, height and width of the embossing are to be combined in such a way that the closure starts to release pressure at a predetermined inner pressure level and that a problem-free re- closure or re-sealing takes place at a predetermined reduction in pressure.
• the solution according to the invention functions in the same way in tear-off closures as in crown cork closures.
• the performance of the closure is not influenced, for example, by score lines provided with tear-off closures.
• the conventional standard bottle necks of crown cork type can be used. This is valid for all known bottle neck standards including the European, the American (GPI), the Japanese and similar, all having slightly different neck profile or configuration.
• the bottles can be made of glass or plastic.
• Profile seal means a seal with a "step-like" cross section.
• the profile seal is constructed as substantially L-shaped in cross-section with an outer first (lip-type) sealing ring and an inner second (flat) sealing ring or sealing surface, wherein the outer sealing ring has a greater height and/or a smaller width than the inner sealing ring.
• the invention starts from the knowledge that such a profile seal in interaction with the projection or embossing according to the invention makes it possible to achieve a particularly specific and above all reproducible release of pressure.
• the seals known from practice having a substantially C-shaped liner cross section comprising a high outer lip-type sealing ring, a low and rather flat middle sealing surface and a high lip-type inner sealing ring do not provide any specific release of pressure below 10 bar.
• the projection or embossing is constructed as a circumferential step with a side descending steeply down ⁇ wards, forming for example a lower central plate of the covering panel.
• This step can, for example, be constructed as a completely circumferential step with completely identical radius, forming a circular cap central region when viewed from above. It is to be understood that the step itself is located radially to interact with the profile seal, forming a valve. The desired venting effect can be adjusted by tuning the various parameters.
• the circumferential step can have a plurality of step sections with different radii which each extend over a predetermined angular region.
• the step is arranged over a predetermined circumferential region in such a radius which fulfils a stronger venting valve function together with the profile seal whilst the other regions of the step are arranged on a different radius which merely possess a small valve-forming function.
• the desired pressure release or venting effect can be further specified by selecting the corresponding circumferential regions.
• the radius of the step or at least of a step section can be smaller than or equal to or slightly greater than the outer radius of the profile seal and/or greater than or equal to or slightly smaller than the inner radius of the profile seal, thus including that the radius of the step can be of any size greater than the inner radius of the inner sealing ring up to the outer radius of the outer sealing ring.
• the venting valve constituted by the interaction between the profile seal and the embossing possibly can be given a form extending to a radius greater than the outer radius of the profile seal or smaller than the inner radius of the profile seal.
• the step or step section is close enough to the profile seal to interact with the sealing ring or the sealing rings and thereby to influence the sealing properties of the profile seal.
• the side angle of the step or of a step section with respect to the horizontal or with respect to the upper covering panel is for example 40° to 90°, e.g. 60° to 80°.
• angle offers a sensitive parameter for setting the desired venting function.
• a steep angle of approximately 90°, e.g. 80° the seal can be especially strongly influenced and thus a stronger venting valve effect can be achieved.
• flat angles 10° to 40°.
• the projection or embossing is constructed not as a (single) step but as a groove or channel of predetermined width and height, which runs around or extends over a predetermined angular region, with an outer side descending towards the centre of the cap and an inner side ascending towards the centre of the cap.
• the ascending inner side can directly adjoin the descending outer side.
• the groove can be constructed as a circular-ring-shaped, completely circumferential groove viewed from above, which extends over the total area of the cap and thus over a full angle of 360°.
• the angle of inclination of the descending side with respect to the horizontal and/or the angle of inclination of the ascending side with respect to the horizontal can be 40° to 90°, e.g. 60° to 80°.
• the angle(s) of inclination can also be 5° to 40°, e.g. 10° to 40°.
• the groove or the protrusion can be constructed symmetrically or asymmetrically, i.e., with identical or unequal angles of inclination.
• the outer side is constructed as a steep side and the inner side is constructed as a flat side or vice versa.
• the desired degassing effects can be sensitively influenced.
• the invention proposes that the outer radius and/or inner radius of the groove or at least one groove section is smaller than or equal to the outer radius of the profile seal and/or greater than or equal to the inner radius of the profile seal.
• the grooves or groove sections are thus arranged at least partly in the area of the profile seal. They can be arranged completely in the area of the outer sealing ring or also completely in the area of the inner sealing ring.
• the groove or a groove section can also extend from the area of the outer sealing ring into the area of the inner sealing ring. Moreover it is possible that the inner radius and/or the outer radius of the groove is slightly smaller than the inner radius of the profile seal or that the outer radius and/or the inner radius of the groove is slightly greater than the outer radius of the profile seal. However the groove or at least one groove section must be close enough to the profile seal to interact with the profile seal and thereby to influence the sealing properties of the profile seal.
• the width of the groove is preferably 1 mm to 4 mm, e.g. 1 mm to 3 mm.
• the height of the groove or step can be 0.1 mm to 0.8 mm, e.g. 0.2 mm to 0.6 mm.
• the covering panel forming the closure together with the skirt or collar connected thereto are made, according to the invention, of metal, e.g. of tin plate, aluminium or tin-free steel as well as suitable alloys thereof and other metals.
• the sealing insert or liner assigned to the underside of the covering panel is preferably manufactured in one piece and made of plastic.
• the sealing insert or liner is preferably made of polyethylene (PE) e.g. of low molecular density PE (LDPE) or modification thereof, with or without a scavenger agent. In any case, a PVC-free plastic is preferably used.
• the thickness of the (metal) closure shell is 0.15 mm to 0.25 mm, e.g. 0.17 mm to 0.24 mm, preferably 0.17 mm to 0.21 mm.
• the closure can be constructed as a tear-off closure or as a bend-off closure type crown cork.
• the diameter of the closure is around 18 mm to 45 mm.
• Crown cork closures are usually manufactured with a diameter of 26 mm to 27 mm.
• the sealing insert within the scope of the invention is preferably constructed as a full-area liner having a circumferential profile seal on the outside and a low central region which itself has no sealing function.
• Such liners are preferably formed by compression moulding directly into the prefabricated closure which already has the embossing, and moulded onto the underside of the upper covering panel.
• the sealing insert it is also possible for the sealing insert to be fabricated in a separate production step, for example, by being stamped out of an extruded plastic sheet and then affixed, e.g. glued, to the underside of the upper covering panel.
• Fig. 1 shows a bottle closure in the embodiment as a tear-off closure
• Fig. 2 shows a bottle closure in the embodiment as a crown cork closure
• Fig. 3,3a shows a tear-off closure in plan view and in a section A-A through the subject matter from Fig. 3,
• Fig. 4,4a ,4b shows a tear-off closure in a modified embodiment in a plan view and in a section A-A, as well as a section B-B,
• Fig. 5,5a ,5b shows a tear-off closure in a modified embodiment in a plan view and in a section A-A, as well as a section B-B,
• Fig. 6,6a ,6b shows a tear-off closure in a modified embodiment in a plan view and in a section A-A, as well as a section B-B
• Fig. 7,7a shows a tear-off closure in another embodiment in a plan view and in a section A-A
• Fig. 8,8a shows a tear-off closure in another embodiment in a plan view and in a section A-A
• Fig. 9,9a shows a tear-off closure in another embodiment in a plan view and in a section A-A
• Fig. 10,10a shows a tear-off closure in another modified embodiment in a plan view and in a section A-A
• Fig. 11 ,11a,11 b shows a tear-off closure in a plan view and in a section A-
• Fig. 12, 12a, 12b shows a tear-off closure in a plan view and in a section A-A, as well as a section B-B,
• Fig.13, 13a, 13b shows sections of further embodiments of the invention.
• Fig.14, 14a, 14b shows a tear-off closure in another embodiment in a plan view, in a section A-A and a section B-B,
• Fig. 15,15a shows a container closure according to the invention in the embodiment as a crown cork closure in plan view and in a section A-A,
• Fig.16,16a,16b shows a crown cork closure in a modified embodiment in plan view and in a section A-A and a section B-B
• Fig. 17,17a shows a crown cork closure in another embodiment in plan view and in a section A-A
• Fig. 18,18a shows a crown cork closure in another embodiment in plan view and in a section A-A
• Fig. 19,19a shows a crown cork closure in another embodiment in plan view and in a section A-A
• Fig. 20,20a shows the subject matter from Fig. 6 or 6a during sealing
• Fig. 21 ,21a shows the subject matter from Fig. 19 or 19a during sealing.
• Figure 1 shows the basic structure of a bottle closure in the embodiment as a tear-off closure.
• the closure consists of an upper, round covering panel 1 adjoining' which on the outside is a substantially cylindrical collar or skirt 2 which embraces the bottle neck 3 in the course of sealing and grips under a bead 4 or a flange of the bottle neck.
• a sealing liner 5 which cannot be seen in Fig. 1
• a circumferential profile seal 6 on the outer circumferential side. It can also be seen in Fig.
• the tear-off closure has a tear-off opening strip 7 with a tongue 8 projecting from the cap skirt 2, wherein the tear-off strip is defined by score lines 9, 9' arranged in the closure.
• the score lines on both sides are normally of the same length, but can vary from half length 9' to full length 9.
• the tongue 8 is connected to a pulling member 10. Different embodiments of such a tear-off closure according to the invention are shown in Figs. 3 to 14.
• Fig. 2 shows a bottle closure in the embodiment as a crown cork closure wherein the circumferential skirt 2 is here provided with the usual embossed corrugations or teeth 11.
• Figs. 15 to 19 Different embodiments of such a crown cork closure according to the invention are shown in Figs. 15 to 19.
• the upper covering panel 1 has one or a plurality of at least partly circumferential projections 12, 12a, 12b, 13, 13a, 13b on its underside facing the sealing insert 5, which are made of embossings and interact with the profile seal 6 forming a venting valve and for this purpose project or protrude into the area of the profile seal 6.
• embossings are not shown in Figs. 1 and 2.
• the profile seal is constructed as a substantially L-shaped cross-section with an outer first sealing ring 6a and an inner second sealing ring or surface 6b, wherein the outer sealing ring 6a has a larger height and a smaller width than the inner sealing ring 6b.
• the projections or embossings are constructed as circumferential steps 12, 12a or 12b having a descending side 14 towards the centre M of the cap.
• a pressed down cap central region 15 is created in the area of the cap centre so that over ⁇ all a lower central panel 15 is provided.
• Fig. 4, 5 and 6 for example show embodiments in which a plurality of step sections 12a, 12b with different radii R, R 1 are provided.
• the step sections 12a, 12b each extend over a predetermined angular range ⁇ or ⁇ 'or ⁇ ".
• the radius R, R' of the step here means the upper radius, that is the radius in the area of the upper edge of the step.
• two circumferential steps 12a are provided, each running around over an angle ⁇ of approximately 150° and giving a reduced venting effect, said steps having a radius R which substantially corresponds to the inner radius P 1 of the profile seal 6.
• valve-forming step sections 12b Arranged diametrically opposite between these two steps 12a are valve-forming step sections 12b whose radius R' is con ⁇ figured such that the step 12b is arranged substantially in the area of the outer sealing ring 6a.
• the two valve-forming step sections are provided with different lengths, that is they cover different angular regions ⁇ ' or ⁇ ".
• Figs. 5 and 6 one step section 12a runs over an angle ⁇ of about 320° and one step section 12 b runs over an angle ⁇ 1 of about 40°.
• Fig. 5 shows an embodiment where the step sections 12a, 12b are partly inside the region of the profile seal 6.
• the (upper) radius R' of step 12b and (upper) radius R of step 12a are both smaller than the outer radius Pa and greater than the inner radius Pi of the profile seal.
• the "lower" radius of the steps is smaller than the inner radius Pi of the profile seal 6.
• Lower radius is the radius in the area of the lower edge of the step.
• the flat step size 12b with an inclination ⁇ of about 10° constitutes the venting valve 12b influencing the inner sealing ring 6b to release inner pressure to open the outer sealing lip 6a at a predetermined inner pressure in the bottle.
• This valve function is strengthened by the steeper step side 12a with an inclination ⁇ of about 20° located approximately to 50 % inside the inner radius of the profile seal.
• the step 12b of Fig. 6 corresponds to step 12b of Fig. 5.
• the steep step 12a has an inclination ⁇ of about 60° and an (upper) radius R that is identical to or slightly smaller than the inner radius Pi of the profile seal.
• the lower radius is smaller than Pi, however the step is close enough to influence the inner sealing ring 6b.
• the valve function is completed by the flat step side 12b with an inclination ⁇ of about 10° forming the narrow venting valve.
• the embossings are constructed as grooves 13, 13a, 13b of predetermined width B and height H running over a predetermined angular range, wherein the grooves each have an outer side 16 which descends towards the centre of the cap and an inner side 17 which ascends towards the centre M of the cap.
• Width B here means the "upper width", that is the total width of the groove in the area of its upper edges.
• the groove 13 is respectively constructed as a completely circumferential annular groove 13. That is, the groove 13 extends over the total angular region or over a full angle of 360°.
• the venting effect can be specifically set by the position of the groove 13 relative to the profile seal 6.
• Fig. 10 shows an embodiment with a reduced venting effect compared with Figs. 8 and 9 since the groove according to Fig. 10 is displaced further into the region of the inner sealing ring 6b.
• the groove 13 is also constructed as a completely circumferential groove.
• Figs. 11 , 12 for example show embodiments in which a plurality of groove sections 13a,b are provided which each extend merely over a limited angular region ⁇ , ⁇ ⁇ ".
• FIG. 12 and Figs. 12a and 12b A comparative examination of Fig. 12 and Figs. 12a and 12b clearly shows that the individual grooves of the four grooves 13a-13b are each configured differently.
• two grooves 13a with a very strong valve effect are provided in which the outer side 16 is arranged in the area of the outermost edge of the profile seal (or somewhat outside).
• the outer radius R a of the groove approximately corresponds in this region to the outer radius P a of the profile seal 6 or is even somewhat larger.
• the inner radius Rj is in this region smaller than the outer radius P a of the seal 6 and larger than the inner radius P 1 of the seal 6.
• FIG. 11 shows an embodiment with one long groove section 13b extending over an angle ⁇ and one short groove section 13a extending over an angle ⁇ ' as a venting valve.
• the groove 13b is completely within the region of the profile seal whereas the groove section 13a is only partly in the region of the profile seal.
• the groove side 16 of groove 13a has flat inclination and is partly outside the profile seal increasing the venting effect.
• Figure 14 furthermore shows an embodiment in which a plurality of groove sections 13a, b are provided which all have the same shape but are arranged on different radii R a , Rj.
• the two diametrically opposite short grooves 13a are arranged on a relatively large outer radius R a and inner Radius Rj in the area of the lip-kind outer sealing ring 6a whereas the grooves 13b which are lengthened in comparison as shown in Fig. 14b are arranged in the area of the flat inner sealing ring 6b and thus over a reduced outer radius R 3 and inner radius Rj.
• the valve function is substantially taken over here by the two outer grooves 13a.
• the groove sections 13a,b here are substantially U-formed in cross section.
• the angle of inclination ⁇ of the step can be constructed as relatively steep and have an angle of 45° to 90°, e.g. 60° to 80° with respect to the horizontal (see Fig. 3a).
• a flat angle of inclination ⁇ in the area of the step which can, for example, be 10° to 45° (see Fig. 4a).
• the angles of inclination ⁇ and ⁇ of the sides 16, 17 of the circumferential grooves can be selected similarly. For example, Fig.
• FIG. 8a shows an embodiment with a relatively steep angle of inclination ⁇ of the outer side 16 wherein a relatively flat ascending inner side 17 then adjoins this side 16.
• An inverse arrangement is provided, for example, in the embodiment in Fig. 12b.
• the figures furthermore make clear that the L-shaped profile seal 6 can also be adapted within limits to the circumstances.
• a substantially vertically downward- directed outer sealing ring or a sealing lip 6a is always realised, which is compressed with its inner surface 18 as shown in Figs. 20 or 21 at sealing on the outer top 3a and outside surfaces 3b of the bottle neck 3 providing a satisfactory sealing.
• the inner sealing ring or surface 6b is flat so that it is softly compressed on the top surface 3a without embracing the inner surface 3c of the bottle.
• the inner sealing ring 6b can yield so that a release of pressure can take place.
• the lower sealing surface 19 of the inner sealing ring 6b is arranged substantially horizontally. Substantially horizontally in this case also includes those embodiments in which the sealing surface 19 is inclined at a relatively small angle of 1° to 20° e.g. 15° with respect to the horizontal in the one direction or in the other. For this purpose reference should be made to Figs. 18 and 19 which show suitably inclined sealing surfaces 19.
• inner sealing ring of substantial height and at a distance from the outer sealing ring or lip, which inner sealing ring embraces the inner surface 3c of the bottle neck (type C-shaped profile seal) prevent or strongly reduce a release of pressure and an interaction of the profile seal with the embossings.
• the thickness and sealing efficiency of the profile seal 6 is reduced in a certain degree by the embossing so that the sealing properties can be adjusted by the choice of shape and depth and position of the embossing.
• a quite considerable saving of material can be achieved and overall manufacture will be cheap as established conventional technique can be used with minor changes of toolings.
• Fig. 7 for example, another upwardly directed step-like shaping 20 is provided at a distance inside the inner radius of the profile seal which has no influence on the valve effect but fulfils a stiffening function.
• valve- forming effect is substantially achieved by the "short” embossing whilst the "long” shapings along the tear-off lines are only of secondary importance in connection with the valve formation but facilitate tearing off the closure by the favourable lever arrangement.
• the bending radius r of the step between the covering panel and the step descending side 14 and between the step descending side and the bottom plate and the bending radius r of the grooves between the covering panel and' the descending side 16, between the descending side 16 and the ascending side 17 and between the ascending side 17 and the covering panel also are indicated.
• a distinct embossing bend is achieved and at a greater radius r a rounder embossing bend.
• a distinct bend is influencing the venting valve effect more strongly than a rounder bend, increasing the flexibility of the invention.
• Fig. 20 shows the tear-off closure of Fig. 6 ready for sealing.
• Fig. 20a shows this closure after sealing with the crimped-in skirt.
• Fig. 21 shows the crown cork closure of Fig. 19 ready for sealing.
• Fig. 21a shows this closure after sealing with the skirt pressed to the bottle neck 3 and slightly crimped-in under the bottle neck bead.

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

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