SI20179A2

SI20179A2 - Threaded screwcap, particularly for pet bottles

Info

Publication number: SI20179A2
Application number: SI9900035A
Authority: SI
Inventors: Franc Alič
Original assignee: Orpal Predelava Plastike, Orodjarstvo
Priority date: 1999-02-17
Filing date: 1999-02-17
Publication date: 2000-08-31

Abstract

The aim of the inventor was to provide a low cost threaded screwcap, particularly for closing bottles for storing refreshing drinks containing carbon dioxide or so called carbonated drinks, which would due to an utmost simple unwinding of the screwcap from the PET bottle and despite the specified winding moment to the PET bottle, provide appropriate sealing between the screwcap and the plastic bottle in all anticipated regular conditions, which the screwcap with the plastic bottle is subjected to during the time between filling and opening. The application describes a threaded screwcap, particularly for PET bottles, which is made like a single side open pipe-like structure. The screwcap features a front side (2) and an internal circular wall (1) with an internal thread (5) on its inner surface (11). The specified thread (5) is if necessary equipped with ventilation openings (51), while the screwcap itself can also be if required equipped with a sealing ring (4), attached to the specified circumferential wall (1). The internal surface (12) of the circumferential wall (2) features a sealing ring (6)

Description

Navojni zamašek, zlasti za plastenkeThreaded stopper, especially for plastic bottles

Pričujoča prijava se nanaša na navojni zamašek, zlasti za plastenke.The present application relates to a threaded stopper, especially for bottles.

Obravnavana rešitev temelji na problemu, kako zasnovati karseda cenen navojni zamašek, zlasti za zapiranje plastenk za shranjevanje osvežilnih pijač z vsebnostjo ogljikovega dioksida oz. tkzv. gaziranih pijač, pri katerem naj bi bilo zaradi karseda enostavnega odvijanja zamaška s plastenke omejenemu navoru privijanja zamaška na plastenko navkljub zagotovljeno ustrezno tesnenje med zamaškom in plastenko v vseh regularno predvidljivih pogojih, katerim je zamašek s plastenko izpostavljen v časovnem obdobju vse od polnjenja pa do odprtja plastenke.The solution under consideration is based on the problem of how to design an inexpensive threaded stopper, especially for sealing bottles for the storage of refreshing beverages containing carbon dioxide or carbon dioxide. tkzv. carbonated beverages, which, due to the simple unscrewing of the cap from the bottle, despite the limited torque of screwing the cap to the bottle, despite the proper sealing between the cap and the bottle under all regularly predictable conditions, to which the cap of the bottle is exposed in the period from filling to opening plastic bottles.

Na pričujočem področju tehnike je znana vrsta rešitev navojnih zamaškov za plastenke. Kot relevantne gre šteti predvsem tiste, ki so izvedeni kot enostransko zaprta cevasta tvorba, obsegajoča plašč ali natančneje obodno potekajočo steno ter čelno steno, po potrebi pa tudi plombirni prstan. Pri tem je na notranji površini omenjene obodne stene na voljo notranji navoj, ki je prirejen za ustrezno sodelovanje z zunanjim navojem na vratu plastenke ali druge podobne embalaže, katere zapiranje naj bi bilo omogočeno s tovrstnim zamaškom. Navoj je po potrebi opremljen z odzračevalnim prehodi. Na zunanji površini obodne stene so lahko na voljo npr. ustrezna rebra ali druga primerna sredstva za izboljšanje oprijemljivosti ali estetskih ali tudi drugih učinkov. Omenjena čelna stena zamaška je lahko ravna ali bombirana, njena zunanja površina pa je spet lahko opremljena z natisnjenimi ali reliefnimi ornamentalnimi dodatki, vdolbinami in podobnim. Notranja površina čelne stene je pri celi vrsti doslej znanih in uporabljanih rešitev predvidena za vzpostavitev ustreznega tesnenja med zamaškom in vratom plastenke ali podobne embalaže.In the present art there are a number of known solutions for threaded stoppers for bottles. Particularly relevant are those made as a single-ended tubular formation, comprising a sheath or, more specifically, a circumferential running wall and a front wall, and, if necessary, a sealing ring. An inner thread is provided on the inner surface of said circumferential wall, which is adapted to co-operate with the outer thread on the neck of the bottle or other similar packaging, the closure of which is to be made possible by such a stopper. The thread is provided with vent vents as needed. On the outer surface of the perimeter wall, e.g. suitable ribs or other suitable means of improving adhesion or aesthetic or other effects. Said front wall of the stopper may be straight or bombarded, and its outer surface may again be provided with printed or embossed ornamental accessories, indentations and the like. The inner face of the front wall is designed to provide adequate sealing between the stopper and the neck of the bottle or similar packaging for a variety of known and used solutions.

Pri določenih prijavitelju znanih rešitvah je omenjeno tesnenje med zamaškom in vratom plastenke ali druge podobne embalaže doseženo na tak način, da je notranja površine čelne stene zamaška prevlečena s tesnilno plastjo. Pri privitju zamaška na plastenko pride do naleganja čelne površine vratu plastenke ali podobne embalaže na omenjeni tesnilni plasti. Tesnilna plast je lahko izvedena npr. iz gume ali drugega ustreznega in biološko neoporečnega gradiva s področja umetnih mas ali tudi npr. iz gradiva iz družine silikonov. Odveč je poudarjati, da je nanašanje takšne tesnilne plasti dokaj zapleten poseg, ki pri cenenem zamašku predstavlja nezanemarljiv dodaten strošek. Vendar pa to še zdaleč ni edina pomanjkljivost. Kot je namreč znano, so zahteve v zvezi s tesnenjem so zlasti ostre pri plastenkah, predvidenih za polnjenje tako imenovanih gaziranih ali ogljičenih pijač, namreč osvežilnih pijač z določeno vsebnostjo ogljikovega dioksida. V takih primerih mora biti čelna površina vratu plastenke izdelana z brezhibno natančnostjo. Kljub temu je težko zagotoviti zahtevano plinotesnost v različnih temperaturnih pogojih ter ob vibracijah, udarcih, pretresanju ter drugih lažje in težje previdljivih neugodnih vplivih v celotnem časovnem obdobju od polnjenja pa vse do odprtja plastenke. Problem je še zlasti pereč, ker ga ni možno odpraviti zgolj s povečanjem sile tesnenja oz. z močnejšim privitjem zamaška. Slednje namreč privede k temu, da porabniki težko odvijejo zamašek in zato take izdelke praviloma celo odklanjajo.In certain embodiments known to the applicant, said sealing between the stopper and the neck of the bottle or other similar packaging is achieved in such a way that the inner surface of the front wall of the stopper is coated with the sealing layer. When screwing the stopper to the bottle, the front surface of the neck of the bottle or similar packing on the said sealing layer comes into play. The sealing layer may be made e.g. made of rubber or other suitable and biologically sound plastic material or e.g. from material from the silicone family. Needless to say, the application of such a sealing layer is a rather complicated procedure, which represents a significant additional cost for a cheap stopper. However, this is by far not the only drawback. As is well known, the sealing requirements are particularly stringent for bottles intended for bottling carbonated or carbonated beverages, namely refreshments with a certain carbon dioxide content. In such cases, the front surface of the bottle neck must be made with perfect precision. Nevertheless, it is difficult to provide the required gas tightness in different temperature conditions and in the case of vibrations, shocks, shocks and other more easily and difficult to detect adverse effects throughout the period from filling until the bottle is opened. The problem is especially acute because it cannot be solved by simply increasing the sealing force. with a stronger screw cap. The latter causes consumers to find it difficult to unscrew the stopper and, as a rule, even discard such products.

Nadaljnja rešitev, po kateri so posegali proizvajalci, je ta, da je zamašek na notranji površini čelne stene opremljen s tulčastim nastavkom, ki naj bi med privitjem zamaška na vrat plastenke ali podobne embalaže nalegal na ustje vratu plastenke, namreč na notranji rob vratu. Nastavek je tako izveden, da kot nekakšen prstan /gledano v radialni ravnini/ klinastega prečnega prereza aksialno štrli vsaj približno pravokotno iz ravnine notranje površine čelne stene zamaška v smeri proti odprtemu koncu zamaška. Med privitjem zamaška na vrat plastenke omenjeni nastavek vstopi v vrat plastenke ter s svojo upoševljeno površino naleže na ustje iz. notranji rob vratu plastenke. Vsekakor je izdelava takšnega nastavka enostavnejša in cenejša kot opremljanje zamaška s tesnilno plastjo. Vendar pa kljub temu celoten sklop problematike v zvezi z zagotavljanjem ustreznega tesnenja ob omejenem navoru odpiranja v različnih pogojih skladiščenja in odpiranja npr. gazirane pijače vsebujočih plastenk ostaja v celoti nerešen.A further solution, which was interfered with by the manufacturers, is that the stopper on the inner surface of the front wall is provided with a nozzle which, while screwing the stopper to the neck of the bottle or similar packaging, lies on the mouth of the bottle neck, namely the inner edge of the neck. The nozzle is so designed that, as a kind of ring / radially / wedge-shaped cross-section, it protrudes axially at least approximately perpendicularly from the plane of the inner surface of the front wall of the stopper towards the open end of the stopper. During the screwing of the stopper to the neck of the bottle, said nozzle enters the neck of the bottle and, with its considered surface, fits into the mouth of the bottle. the inner edge of the neck of the bottle. In any case, making such a nozzle is easier and less expensive than fitting a sealing cap. However, the whole set of problems with providing adequate sealing with limited torque of opening under different storage and opening conditions e.g. carbonated beverage containing bottles remains completely unsolved.

V duhu pričujoče rešitve je pri navojnem zamašku, zlasti za plastenke, zasnovanem kot enostransko odprta cevasta tvorba ter obsegajočem čelno steno in z notranjim navojem na njeni notranji površini opremljeno obodno steno, na notranji površini omenjene obodne stene na odmiku od čelne stene na voljo tesnilni obroč. Pri tem je navoj po potrebi opremljen z odzračevalnimi kanali, sam zamašek pa po potrebi s plombimim prstanom, priključenim k omenjeni obodni steni.In the spirit of the present invention, a threaded stopper, especially for plastic bottles, is designed as a one-sided open tubular formation and comprising a face wall and an inner thread on its inner surface, a sealing ring is provided on the inner surface of said circumferential wall at a distance from the face wall. . The thread is optionally provided with vent channels and the stopper itself, if necessary, with a sealing ring connected to said circumferential wall.

Omenjeni tesnilni obroč je prednostno zasnovan kot aksialen koničen odsek - gledano v radialni ravnini - razmeroma tenkega prečnega prereza ter iz enakega gradiva kot obodna stena zamaška oz. celoten zamašek. Pri tem pa tesnilni obroč obsega vsaj eno navznoter obrnjeno površino kot tudi vsaj eno za naleganje na vratu vsakokrat razpoložljive plastenke ter s tem za tesnenje predvideno navzven obrnjeno površino. Razen tega je tesnilni obroč prednostno izbočen v smeri proti odprtemu koncu zamaška, t.j. proti plombimemu prstanu, kadar je le-ta na voljo. Kot med notranjo površino obodne stene in med navzven obrnjeno površino tesnilnega obroča lahko znaša med 45° in 75°, prednostno pa vsaj približno 60°.Said sealing ring is preferably designed as an axial conical section - when viewed in the radial plane - of a relatively thin cross-section, and of the same material as the peripheral wall of the stopper or. the whole stopper. In this case, the sealing ring comprises at least one inwardly facing surface as well as at least one of the bottles of the bottle, which is available at each time, and thus the outwardly facing surface provided for sealing. In addition, the sealing ring is preferably convex towards the open end of the stopper, i.e. against the sealing ring when available. The angle between the inner surface of the peripheral wall and the inwardly facing surface of the sealing ring may be between 45 ° and 75 °, and preferably at least about 60 °.

Povsem v splošnem pa je tesnilni obroč v osnovi lahko zasnovan kot kolobar - gledano v radialni ravnini - razmeroma tenkega prečnega prereza ter iz enakega gradiva kot obodna stena zamaška oz. celoten zamašek, pri čemer je razporejen bodisi v območju prehoda med obodno steno in čelno steno ter na ustreznem odmiku od slednje ali pa.na notranji površini obodne stene vsaj v bistvu v bližini izteka navoja in hkrati vsaj v bistvu v bližini prehoda med obodno steno in čelno steno ter na ustreznem odmiku od slednje. Vsekakor pa tudi vsakršna splošna rešitev omenjenega tesnilnega obroča zamaška obsega vsaj eno navznoter obrnjeno površino kot tudi vsaj eno za naleganje na vratu vsakokrat razpoložljive plastenke ter s tem za tesnenje predvideno navzven obrnjeno površino.In general, however, the sealing ring can basically be designed as a ring - viewed in the radial plane - of a relatively thin cross-section and made of the same material as the peripheral wall of the stopper and / or joint. the entire stopper, being arranged either in the region of passage between the circumferential wall and the front wall and at a suitable distance from the latter, or at the inner surface of the circumferential wall at least substantially near the end of the thread and at least substantially near the passage between the circumferential wall and front wall and at a suitable distance from the latter. In any case, any general solution of said sealing ring of the stopper comprises at least one inwardly facing surface, as well as at least one of the bottles of the bottle which is available at each time, and thereby providing an outwardly facing surface for sealing.

Zamašek bo v nadaljevanju podrobneje obrazložen na osnovi primera izvedbe, ki je na sl. 1 prikazan v polovičnem prerezu v diametralni ravnini.The stopper will now be explained in more detail on the basis of the embodiment shown in FIG. 1 shown in half-section in the diametrical plane.

Zamašek po sl. 1 je izveden kot enostransko odprt cevast izdelek, ki ga v osnovi tvorita cevasta obodna stena 1 in diskasta čelna stena 2, med katerima je na voljo v danem primeru blago zaokrožen prehod 3.The stopper of FIG. 1 is designed as a single-sided tubular product formed essentially by a tubular circumferential wall 1 and a disc-shaped front wall 2, in which case a slightly rounded passage 3 is available.

V danem primeru je zamašek opremljen tudi s plombimim prstanom 4, ki je preko ustreznih oslabitev oz. mostičev 41 priključen k obodni steni 1.In the present case, the stopper is also provided with a sealing ring 4, which, through appropriate attenuations or impediments. bridges 41 connected to circumferential wall 1.

Zunanja površina 11 obodne stene 1 je v danem primeru gladka, na notranji površini 12 obodne stene 1 pa je na voljo navoj 5. Geometrijske karakteristike navoja 5 pri zamašku po sl. 1 lahko popolnoma ustrezajo tistim, ki so v stroki splošno znane in uporabljane.The outer surface 11 of the circumferential wall 1 is smooth, if necessary, and the thread 5 is available on the inner surface 12 of the circumferential wall 5. The geometrical characteristics of the thread 5 at the stopper of FIG. 1 can be perfectly relevant to those of ordinary skill in the art.

Prav tako so v stroki znani odzračevalni kanali 51, ki so realizirani s pomočjo ustreznih prekinitev navoja 5.Also known in the art are vent channels 51 which are realized by means of suitable thread breaks 5.

Zunanja površina 21 čelne stene 2 je v danem primeru ravna in gladka, lahko pa bi bila izvedena tudi reliefno, z vdolbinami, potiskana ali drugače obdelana. Tudi notranja površina 22 čelne stene 2 zamaška je v danem primeru ravna in gladka, še zlasti pa izvedena brez vsakršne tesnilne prevleke ali prstanastega nastavka ali podobnih dodatkov v smislu zagotavljanja tesnenja med zamaškom in na sl. 1 neprikazano plastenko oz. vratom le-te.The outer surface 21 of the front wall 2 is optionally flat and smooth, but may also be embossed, recessed, stamped or otherwise machined. Also, the inner surface 22 of the front wall 2 of the stopper is optionally flat and smooth, and in particular is made without any sealing coating or annular attachment or similar accessories in order to provide a seal between the stopper and FIG. 1 not shown bottle or. their neck.

Pač pa je prikazani zamašek na notranji površini 12 obodne stene 1 v neposredni bližini prehoda 3 med omenjeno obodno steno 1 in čelno steno 2 zamaška ter na odmiku od čelne stene 2 opremljen s tesnilnim obročem 6.However, the closure shown on the inner surface 12 of the circumferential wall 1 in the immediate vicinity of the passage 3 between said circumferential wall 1 and the front wall 2 of the stopper and provided with a sealing ring 6 at a distance from the front wall 2.

Tesnilni obroč 6 je v osnovi izveden kot /gledano v radialni ravnini/ kolobar razmeroma tenkega, prednostno pravokotnega prečnega prereza ter s prednostno kar gladkima in karseda ravnima navznoter obrnjeno površino 61 in navzven obrnjeno površino 62. Natančneje je v danem primeru (kar je tudi sicer prednostno) tesnilni obroč 6 izveden v obliki aksialnega koničnega odseka in pri tem izbočen v smeri proti odprtemu koncu zamaška oz. proti plombimemu prstanu 4, kadar je le-ta na voljo. Glede na prednosten namen uporabe zamaška za zapiranje plastenk z gaziranimi pijačami je zlasti ugodno, če je kot a med notranjo površino 11 obodne stene 1 in med navzven obrnjeno površino 62 tesnilnega obroča 6 izbran v območju med 45° in 75°, prednostno pa znaša vsaj približno 60°.The sealing ring 6 is essentially designed as / radially / circumferentially relatively thin, preferably rectangular in cross-section, and preferably with a surface which is as smooth and as flat as possible, inverted surface 61 and inverted surface 62. More specifically, in the present case (which is also the case preferably) the sealing ring 6 is made in the form of an axial conical section, while being convex towards the open end of the stopper or. against the sealing ring 4 when available. In view of the preferred use of the bottle stopper for carbonated beverages, it is particularly advantageous if the angle a between the inner surface 11 of the circumferential wall 1 and the outer face 62 of the sealing ring 6 is selected in the range of 45 ° to 75 °, and preferably is at least about 60 °.

Ob primerni izbiri gradiva zamaška, ki pa brez nadaljnjega lahko ustreza enemu od že doslej splošno uporabljanih gradiv, s primemo izbiro izmer in kota a oz. naklona tesnilnega obroča 6 lahko dosežemo ustrezno elastičnost tesnilnega obroča 6. Tako se med privitjem zamaška na vrat neprikazane plastenke tesnilni obroč 6 elastično deformira oz. umika oz. odklanja v smeri proti čelni steni 2 zamaška oz. njeni notranbji površini 22. Pri nižjih temperaturah okolice ali drugih vplivih, ki bi sicer lahko privedli do poslabšanja tesnenja med zamaškom in vratom neprikazane plastenke je zahvaljujoč prej omenjenim elastičnim deformacijam tesnilnega obroča 6 zagotavljeno zanesljivo naleganje tesnilnega obroča 6 na vratu neprikazane plastenke ter s tem tesnenje zamaška.With the appropriate choice of stopper material, which, without further ado, may correspond to one of the commonly used materials so far, with the choice of measuring a and a. the proper elasticity of the sealing ring 6 can be obtained from the inclination of the sealing ring 6. withdrawal or. deflects in the direction of the front wall 2 stopper or. its inner surface 22. At lower ambient temperatures or other influences that could otherwise lead to a deterioration of the seal between the stopper and the neck of the not shown bottle, due to the aforementioned elastic deformations of the sealing ring 6, a secure alignment of the sealing ring 6 on the neck of the unsealed bottle is ensured. stopper.

Claims

PATENT APPLICATIONS

A threaded stopper, in particular for plastic bottles, designed as a single-sided tubular formation and comprising a face wall (2) and an inner wall (11) provided with a circumferential wall on its inner surface (11), provided that the thread (5) is provided with vent channels (51), and the cap itself, if necessary, with a seal ring (4) connected to said circumferential wall (1), characterized in that it extends from the front wall (1) at the inner surface (12) of the circumferential wall (1). 2) Sealing ring (6) available.

Thread stopper according to the preceding claim, characterized in that the sealing ring (6) is designed as an axial conical section - viewed in the radial plane - of relatively thin cross-section and of the same material as the circumferential wall (1) of the stopper.

Threaded stopper according to the preceding claim, characterized in that the sealing ring (6) comprises at least one inwardly facing surface (61) as well as at least one of the bottles of the bottle which is available in each case and thus providing an outwardly facing surface (62) for sealing. .

A threaded stopper according to the preceding claim, characterized in that the sealing ring (6) is convex towards the open end of the stopper, i.e. against the seal ring (4) when available.

Thread stopper according to the preceding claim, characterized in that the angle (a) between the inner surface (11) of the circumferential wall (1) and the outwardly facing surface (62) of the sealing ring (6) is selected in the range between 45 ° and 75 °.

Thread stopper according to the preceding claim, characterized in that the angle (a) between the inner surface (11) of the circumferential wall (1) and between the outwardly facing surface (62) of the sealing ring (6) is at least about 60 °.

Threaded stopper according to claim 1, characterized in that the sealing ring (6) is basically designed as a ring - viewed in the radial plane - of relatively thin cross-section and of the same material as the circumferential wall (1) of the stopper.

Threaded stopper according to claim 7, characterized in that the sealing ring (6) is essentially designed as a ring - viewed in the radial plane - of relatively thin cross-section and of the same material as the circumferential wall (1), with arranged in the area of passage (3) between the circumferential wall (1) and the front wall (2) and at a suitable distance from the latter.

Threaded stopper according to claim 7, characterized in that the sealing ring (6) is basically designed as a ring - viewed in the radial plane - of a relatively thin cross-section and of the same material as the circumferential wall (1). arranged on the inner surface (12) of the circumferential wall (1) at least substantially near the end of the thread (5) and at least substantially near the passage (3) between the circumferential wall (1) and the front wall (2) and at a suitable distance therefrom .

Threaded stopper according to any one of claims 7-9, characterized in that the sealing ring (6) comprises at least one inwardly facing surface (61) as well as at least one of the bottles available in each case and thus sealing outwards facing surface (62).