DE2831746A1 - LAYER-FREE PLASTIC CLOSURE - Google Patents

Description

Aluminum Company of America, Pittsburgh, Pennsylvania, V. St. A.

Insert-free plastic closure

IWAOHGERBCHT

The present invention relates to closures for closing containers and, more particularly, to a plastic closure in one piece with this trained seal.

There are plastic closures with these one-piece seals known that the need for a separate insert seal get around in the locks; in this way, the manufacturing costs of the closures can be reduced Linerless closures often have downwardly protruding ribs or ridges that extend onto the container surface, such as the HS-PSs 3,224,617 and 3,844,439 disclose. Other insert-free closures have flexible membrane parts that fit tightly place on a container surface; cf. the US-PSn 2.W «> 206, 3.160.303 and 3-4-14.151.

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Among the disadvantages of liner-free plastic closures are the poor visibility peculiar to rough or irregular Container surfaces and the limited service life as a result of relaxation of the plastic during aging, in which the Loss of tight seal. Sealed containers, however, should last for a year without a period of time the tight closure is lost *

There is a need for an improved insole-free st®f £ T © 2? sehlui gLq3? free is where & ä @ n Mao3kfe © il © a & © 3? Setüüss © ä®Q Stsaöes äer

The present invention creates © inea © iala @ tef £ closure with g ± o © 2? Sadwaiaöimg et al. & © iaor lan

downwards v @ rst © h © ad © Soliürss © mit in diesel «, ait 4 © e äer ¥ © rselslTaI can be fixed on kaim« BiQ Eadwandung has a wall part that extends into the upper edge of the apron via a flexible, bendable wall part transforms". Bar ¥ -förai @ © wall part is provided with a circumferential sealing edge ea apex öes' ¹ T ", which can be applied to an upturned biöhtfläche of a container Prevent container asu

The closure can also contain a lubricant in the form of paraf · «. fin or wax either in the plastic itself or as a

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included on the inner surface to reduce the torque required to secure the closure to a container to commercially acceptable levels. By reducing the torque required to overcome the friction, one can increase the sealing pressure of the closure on the container and thereby a longer storage line; of the closed container

Fig. 1 of Zeic & smg is an enlarged view of a shutter BBGh. eier present invention;

2 is © la Vergsosssrter SoilseäBitt of the closure of the D ¹ Ig ₀ i ataf @ iE © n

nac ^. The invention lies beyond νθϊ ¹ for aorualQ PlaseMesioberfläolänen koastnaierto Ber Sicht AbschlmS takes place through the high tension in the plastic in the visible area, where «Efcsla aaf rough? © the wave Obsrfläeke a dense Ab = s © M.iaß entsteh * · The Eoastruktioa is reached there s © that the Dickfe © lsQea "fe si © L accordingly the Eeatiar ä @ s TBasbeaen glass · = Upper flat verfornea can © A The peculiarity of the present invention is that at the amfs © tsea of the Z © ntralt © ils calibrated relative to the Schürse according to © b®a auslöaktj you get s © @iae calibratable display ©, dal des, lock © in @ usr @ i ch@nd.es Auf sets = moment has been given to make the absjehlmß or _similar

Vie in the lig * 1 shown, has a lock 10 after the

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present invention an upper end wall 12 and one around the End wall extending around and depending on this The apron 14 has threads running around its inner surface, to set the closure on a container. The closure can continue on the outer surface of the skirt 14 with vertical extending ribs 8, which form a border on which the closure for placing on a container or for Removal of this can be taken.

According to the present invention, the upper end wall 12 of the closure 10 has a central wall part 18 which merges into the skirt 14 via a V-shaped wall part 20, which has an elastically deflectable circumferential first wall part 22 which extends from the outer edge of the central wall part 18 - and protrudes outward, as well as a second wall part 24 which is also elastically deflectable and which protrudes upward and downward from the lower edge of the first wall part. The second wall portion goes into the top edge of the skirt 14 of the closure via _o-shaped v-the wall portion further has at the transition of the first to the second wall portion a peripheral, off and outwardly protruding corner 26 aufο This corner can be close to an upwardly facing Place the sealing surface on a container as described in more detail below.

The closure 10 also has on the inner surface of the Schür * - ze near its upper edge a downward and inward protruding Stop 28, which is the axial length of movement of the closure

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on a container during the Aufsetzvorgsngs "limited without this stop, a closure can be placed too tightly on a container and then leads to this inadequate seal, as described below.

In a preferred embodiment of the present invention, the first and the second wall part 22, 24 · preferably thinner than the central wall portion Ί8, so that the first yrif the second wall portion itself when placed on a container such as described below, elastically deflect _o For example. For example, the central wall portion of a closure may have a thickness of about 1.27 mm (0.050 in.) while the first and second wall portions are about 0.51 mm (0.020 in.) thick.

Closures of this · kind are preferably made of a plastic such as bspwo polypropylene, which has a considerable inherent strength, but in the area of the first and the second wall portion 22, 24 is again elastically deflectable _o The closure may also preferably comprise a lubricant such as a oleamide to To reduce the torque that is required to place the closure on a container.

The torque required to place the closure on the container overcomes the friction between the threads on the closure and the container and on the sealing surface. If the frictional forces are too high, this prevents them from being overcome required torque a sufficiently high pressure

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tension between the sealing surfaces of the container and the closure ο The lubricant in the material of the lock reduces the frictional forces and thus allows for a given torque to achieve a higher sealing pressure stress in the closure.

Fig. 2 shows a closure according to the present invention on a glass container. Compared with the Pig. 1 it can be seen that the closure in Pig. 2 the second wall part 24 is deflected upwards towards the horizontal, the corner 26 pressing essentially downwards on the upper sealing surface 34 of the container. while the central wall part 18 has risen relative to the apron «. The upper part of the skirt has been radially expanded so that there arises a voltage Hing _o The reduced cross-sectional thickness of the first and the second wall portion 22, 24 allows this bowing during the placing operation. The plastic in these wall parts, however, has sufficient tensile strength that a high pressure of the sealing corner 26 is retained on the sealing surface 34 of the container even after prolonged storage. The ring or frame tension in the upper part of the skirt also helps to maintain the appropriate sealing pressure given during storage. It is known that stresses in the plastic decrease in the course of aging, for example during storage of a sealed container before a content is used up. As a special feature of the

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according to the invention, this loss of tension does not result in a loss the sealing pressure between the sealing corner 26 and the container surface 34 in the course of normal storage periods.

It is a further advantage of the present invention that the higher lying in the fitted state of the closure central wall portion 18 provides a visual indication that the container is einwandtfrei closed _o It can therefore visual check at this circumstance the state of closure of the sealed container comfortable.

The stop 28 is important because it causes excessive movement of the closure on the container during the closure process If the closure is placed too tightly on a container, the second wall part 24 can rest on the sealing surface of the container and the sealing pressure of the corner 26 is applied of the sealing surface 34 of the container.

If this is the case, the sealing corner 26 sftch no longer fits Irregularities on the glass surface, as is necessary to ensure a perfect seal. Of the Stop 28 prevents this overmovement of the closure on the container and ensures that the corner touches tightly 26 on the container surface 34 is not affected by such a movement is impaired

As already mentioned, a lubricant in the plastic

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Closure itself or on its inner surface the frictional forces between the closure and the container and facilitates the placement of the closure on a container with high pressure between the sealing corner 26 and the container surface _o Furthermore, the lubricant ensures that the closure can be removed with a sufficiently low torque «.

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Claims (9)

IBERLIN 33 8 MUNICH 80 Auguste-Viktoria-StraBe65 nnilOOUI / TrÄ DADTMCD PienzenauerstraBe 2 Pat.-Anw. Dr. Ing.Ruschke LIr. KUbUHKt & KAK I IM fcK Pat.-Anw.Dipl.-lng. ^ Ä1-1 "9 · PATENTANWÄLTEHansE · Ru5chke98 03 24 Tetofo»: «» / «*» * BERLIN MONKS "" "" "" "" S'S Telegram address: Quadratur Berlin Telegram address: τ ρ ι β ν. ι m 7ftß squaring Munich TELEX. 183786 TELEX: 522767 A 1706 patent claimsJ / uM ^ · / M / W HGERElCHT I 1. Liner-free plastic closure, characterized by an end face and a skirt extending around it and projecting downwards with a rolling arrangement to set the closure on a container, the end wall having a central wall portion which extends over a resiliently deflectable V-shaped wall portion in the upper part of the apron passes over, and the V-shaped wall part at the apex of the "V" has a circumferential sealing corner, which rests tightly on an upwardly facing sealing surface of the container, and by means of a device that allows the closure to move too far on a container prevented. 2. Liner-free plastic closure according to claim 1, characterized in that the V-shaped wall part is formed from an elastically deflectable first part which protrudes downward from the outer edge of the central wall part, and an elastically deflectable second part which is formed from the lower edge of the first Partly protrudes upwards and outwards and enters the upper edge of the apron, with the circumferential corner at the transition from the first to the second part 809885/0981 ORfGfMAL INSPECTED 3. Closure according to claim 2, characterized in that the elastically deflectable parts have a cross-sectional thickness which corresponds approximately to half the thickness of the central wall part 4. A closure according to claim 2, characterized in that the device which prevents excessive movement of the closure is a stop element which is formed in one piece with the closure and projects inward and downward from this at the upper edge of the apron. 5. A closure according to claim 4, characterized in that the circumferential sealing corner is located below the stop. 6. Closure according to one of the preceding claims, characterized in that the circumferential and outwardly projecting corner off. 7. A closure according to claim 6, characterized in that the corner was a right-angled corner 8. Closure according to one of the preceding claims, characterized by a lubricant in the plastic material of the closure O. 9. Closure according to one of the preceding claims, characterized by vertically extending ribs on the outer surface of the skirt of the closure. 809885/0981 283174 ^ 10 »Closure according to one of the preceding claims, characterized in that the rolling device in the closure is a thread. 809885/0981