FI57728C - TILLSLUTNINGSKAPSEL FOER BEHAOLLARE - Google Patents

Description

R35F1 M (11) »AIR CONDITIONING - LJ '; utlägcningsskrift b / 7 2 8 C (45) Patent granted 10 10 1980 i4uirj Patent oeddelat V * ^ (Si) Kv.lk?/iM.CL^ B 65 D 41/32, 41/34 FINLAND — FIN LAND (21) PM »nttlh« lin> u «—P» t »wtin> tHtmng T812U5 (22) Hdwmhpllvl — AMBkitlngri * 21.0U.78 (23) Alkwpltvi — GHtlgh« tsdaf lU.08.75 (41) Tullut (ulkMni - BIMt affemllg 21.0U 78 FMMttl- Ja registallallitut (44),. P * m.- nrten ^ och registeratyrelten 'Aietkan utiagtf o * utUkrttMn pubiicarad 30.06.80

(32) (33) (31) fjnrtsttjr «ueiken — Uglrd priority i9.O8.7U

09.ll.7U Switzerland-Switzerland (CH) 011218 / 7U,

015 217 / 7U

(71) Albert Obrist AG, Römerstr. 83, CH-U153 Reinach, Switzerland-Schweiz (CH) (72) Dietmar Aichinger, Arlesheim, Switzerland-Schweiz (CH) (7U) Berggren Oy Ab (5U) Cap for tanks - Tillslutningskapsel för beh & llare (62) Divided by application 752309 (advertisement 57727) "

Avdelad frän ansökan 752309 (utläggningsskrift 57727)

The invention relates to a closure cap for containers which has a cap part for closing the opening of the container and in which the cap has a guarantee ring detachable along the line of weakness, which by thermoforming is fully adaptable to the outer wall of the container mouth.

Such warranty closures, which indicate that the closure has already been opened, are well known. When unscrewing or tearing off the closing cap, the guarantee ring at the same time comes off along the line of weakness and thus it appears that the container has been opened.

In particular, the thermoforming of the rear tire causes problems. Namely, during the molding operation, the line of weakness is often damaged by the effect of the molding heat. In view of the various environmental effects and the rate at which the mouth closes, heat input cannot be dispensed absolutely evenly.

A method of making such a guarantee closure from plastic is described, for example, in Swiss patent application 505 005.

It uses thermoplastic as the material of the warranty ring.

2 57728 This closure is adversely affected in particular by the fact that the mass of the guarantee ring itself is so large that deformation around the bead placed in the tank neck requires long-term and careful heating. In addition, a material thickening must be formed between the plastically molded guarantee ring and the line of weakness to receive excessive heat. Depending on the structure, this thickening meant that, due to the necessary back cuts thus caused, radially opening injection molding tools had to be used in the manufacture of the hat.

The object of the invention is to avoid the disadvantages of the known guarantee closures, i.e. in particular to provide a guarantee closure which facilitates the installation of the guarantee closure, saves from damage, ensures a simple closing structure and enables higher closing speeds. This is achieved according to the invention in particular by adapting the inner diameter of the guarantee ring in the region of the line of weakness and / or below the line of weakness to the outer wall of the container mouth so that the guarantee ring rests on the outer wall of the mouth of the container to protect the line of weakness. Thus, in the best possible way, during the heat treatment, during the manufacture of the guarantee closure, the greatly thinned guarantee ring is protected from excessive heating at the line of weakness, since the support on the tank neck conducts heat away.

In this way, the application of the hat can be substantially accelerated, whereby a simpler shape can be chosen for the guarantee ring.

The invention can be advantageously implemented if the cross section of the guarantee ring increases from the line of weakness to the lower edge of the ring. It is particularly advantageous if both the hat and the guarantee ring are made of thermoplastic. However, especially with respect to threaded cap closures, it is conceivable to make a threaded cap of any other material and to attach a thermoplastic backing ring to its lower edge.

The invention is explained in more detail below as an application example in connection with the accompanying drawing.

57728

The figure of the drawing shows a partial section through the neck of a container, e.g. a bottle, and a warranty closure having the features of the invention. According to the figure, a threaded cap 1 known per se is placed at the mouth of the container 2, and the threaded cap 1 and the container mouth 2 have a screw thread 3 and 4, respectively. The approximately wedge-shaped guarantee ring 5 is made in one piece with the threaded cap 1 and is made of thermoplastic material. at the inner edge 7 of the opening.

The guarantee ring 5 then rests on the bead 8 of the bottle neck 2, so that when hot air is applied at high pressure from the nozzle 9, only the lower part of the guarantee ring 5 is plasticized and pressed by suitable means around the bead 8 warranty ring.

It would also be possible to apply hot air under pressure to the guarantee ring to heat the guarantee ring so that part of the guarantee ring would be deformed from plastic without mechanical assistance solely by the action of hot air.

Apparently, one skilled in the art will have no difficulty in determining the pressure and temperature of the hot air flowing from the nozzle 9, in particular with respect to the thermoplastic material used and its behavior during the thermal action. The adjustment of the height of the guarantee ring 5 to the respective tolerances also obviously goes without difficulty.

Instead of using only one nozzle 9, which requires rotating the threaded cap 1 to apply a hot air jet to the entire circumference of the rear ring 5, it is of course possible to use several nozzles 9 or even slit-shaped nozzles on the entire circumference or at least part of its circumference.

In certain applications, it is also possible to use the warranty closure according to the invention even in hats without a screw thread. Overall, different embodiments are possible according to the shape of the material container and other variables.

Claims (5)

Closure cap for containers, comprising a cap part for closing the container opening and wherein the cap (1) has a retaining ring (5) detachable along the line of weakness (6), which is thermally adaptable to the outer wall of the container part (2) by thermoforming, characterized in (5) the inner diameter in the region of the line of weakness (6) and / or in the region below the line of weakness is adapted to the outer wall of the container section (2) so that a securing ring (5) for protecting the line of weakness (6) during thermoforming and heat dissipation is supported. Closure cap according to Claim 1, characterized in that the cross-section of the securing ring (5) increases approximately evenly from the line of weakness (6) to the lower edge of the ring. Closure cap according to Claim 2, characterized in that the line of weakness (6) is approximately flush with the inner edge of the opening of the hat (1). Closure cap according to Claim 2 or 3, characterized in that at least the safety ring (5) and the material at the line of weakness (6) are made of thermoplastic. 4,57728 Closure cap according to Claims 2 to 4, characterized in that the hat (1) is a screw cap.