DE2624969C2

DE2624969C2 - Screw cap for bottles, processes and mold cores for their production and deep-drawing die with several mold cores

Info

Publication number: DE2624969C2
Application number: DE19762624969
Authority: DE
Inventors: Zafir Dipl.-Kfm. 6710 Frankenthal Petrov
Original assignee: Individual
Current assignee: Individual
Priority date: 1976-06-03
Filing date: 1976-06-03
Publication date: 1985-10-10
Also published as: DE2624969A1

Description

seite mit einem Gewinde versehen ist Dieses Ende wird beim Tiefziehverfahren in eine Hohlform hineingepreßt und nach Abkühlen des Formlings aus letzterem herausgedreht, wobei vorher noch ein Zurückfahren der Hohlform und das Vorfahren eines Stempels erforderlich wird. Verdreht wird der ganze Formkern, um diesen aus dem Preßformling herausdrehen zu können.side is provided with a thread. This end is pressed into a hollow mold during the deep-drawing process and, after the molding has cooled, it is turned out of the latter, with the hollow mold being retracted beforehand and an ancestor of a stamp is required. The whole mold core is twisted to get it out to be able to unscrew the preform.

Der erfindungsgemäße Formkern selbst ist aus den kennzeichnenden Merkmalen der Ansprüche 2 bis 9 zu entnehmen. Die Möglichkeit, sowohl ein Gewinde als auch Riffelungen vorzusehen, wird dadurch erreicht, daß der das Gewinde tragende Bereich, nämlich den Gewindebereich, von den übrigen Teilen drehbar getrennt ist, so daß sie beim Drehen des Gewindebereiches bzw. des Gewindeteiles dessen Bewegung nicht mitmachen, weswegen die Riffelung an der Schraubverschlußkappe nicht zerstört wird.The mold core according to the invention itself is based on the characterizing features of claims 2 to 9 remove. The possibility of providing both a thread and a corrugation is achieved by that the area carrying the thread, namely the threaded area, is rotatably separated from the other parts so that it does not move when the threaded area or the threaded part is rotated participate, which is why the corrugation on the screw cap is not destroyed.

Eine Tiefziehmatrize, mit der mehrere Schraubverschlußkappen gleichzeitig hergestellt werfen können, ist vorzugsweise dadurch gekennzeichnet, daß die Formkerne durch eine gemeinsame Kette mit einem Antriebsmotor verbunden sindA deep-drawing die with which several screw caps can be produced at the same time, is preferably characterized in that the mold cores by a common chain with a Drive motor are connected

Weitere vorteilhafte Ausgestaltungen der Erfindung sind aus den weiteren Ansprüchen zu entnehmen.Further advantageous embodiments of the invention can be found in the further claims.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist, soll die Erfindung näher erläutert und beschrieben werden. Es zeigtBased on the drawing, in which an embodiment of the invention is shown, the invention is intended are explained and described in more detail. It shows

F i g. 1 eine Schraubverschlußkappe in Seitenansicht undF i g. 1 a screw cap in side view and

F i g. 2 einen Formkern zur Herstellung der Schraubverschlußkappe, im Schnitt und in Explosionsdarsiellung. F i g. 2 a mold core for producing the screw cap, in section and in explosive presentation.

Es wird zunächst Bezug genommen auf die Fig. 1. Die dort gezeigte Schraubverschlußkappe 1 besitzt einen Kappendeckel und einen von diesem herabhängenden Kappenmantel, der einen oberen geriffelten Abschnitt 3, einen Gewindeabschnitt 4 und einen unteren geriffelten Abschnitt 5 aufweist, der in einen unteren glatten kreisförmigen Rand 6 übergeht Jeder der Mantelabschnitte 3, 4 und 5 ist so ausgebildet, daß der jeweils darüber liegende Mantelabschnitt — ausgehend von dem unteren Rand — einen geringeren Durchmesser hat Diese Stufung ist erforderlich, um nach der Herstellung die Schraubverschlußkappe von einem weiter unten beschriebenen Formkern abnehmen zu können, ohne daß für diesen eine axiale Teilung notwendig würde. Reference is first made to FIG. 1. The screw cap 1 shown there has a Cap lid and a cap jacket hanging down from this, the upper corrugated section 3, a threaded portion 4 and a lower corrugated portion 5, which in a lower smooth circular edge 6 passes over each of the jacket sections 3, 4 and 5 is designed so that the overlying jacket section - starting from the lower edge - has a smaller diameter This gradation is required after manufacture to be able to remove the screw cap from a mold core described below, without an axial division being necessary for this.

Das für die Herstellung anzuwendende Tiefziehverfahren ist an sich bekannt. Auf eine Tiefziehmatrize mit mehreren entsprechend ausgebildeten Formkernen wird eine Kunststoffolie gelegt, die sich unter Anwendung von Wärme, Druck und Vakuum an den Formkern anlegt. Die Entformung muß allerding in einer besonderen Weise erfolgen. Hierzu wird der das Gewinde aufweisende Teil des Formkernes in Rotation versetzt, wodurch sich die Folie von den Kernen abhebt. Danach können die Schraubverschlußkappen von dem sie verbindenden Rest der Folie getrennt werden.The deep drawing process to be used for production is known per se. On a deep-drawing die with several correspondingly designed mold cores a plastic film is placed, which is attached to the mold core using heat, pressure and vacuum applies. However, the demolding must take place in a special way. For this purpose, the one that has the thread Part of the mold core is set in rotation, which lifts the film from the cores. Thereafter the screw caps can be separated from the remainder of the film connecting them.

Es sei nun Bezug genommen auf die Fig.2. Der Formkern besitzt ein Basisteil 7, das als Hohlzylinder ausgebildet und an dessen unterem Ende ein Kettenrad 8 angebracht ist. Über dem Kettenrad 8 besitzt das Basisteil 7 einen Teller 9, dessen Außendurchmesser größer ist als der Außendurchmesser des Basisteils und dessen Innendurchmesser kleiner ist als der Innendurchmesser des Basisteils. Der Formkern besitzt ferner einen Gewindeteil 11, an dem ein Stutzen 10 angeformt ist, der auf den Innenbereich des Tellers 9 aufsetzbar ist. Zur Befestigung des Stutzens mit dem Gewindeteil 11 am Teller besitzt letzterer axial verlaufende Durchgangsöffnungen 15, wogegen der Stutzen iö mit Gewindebohrungen 16 versehen ist Mittels die Bohrungen 15 durchgreifenden Schrauben kann der Gewindeabschnitt an dein Teller 9 befestigt verden. Der Formkern besitzt ferner einen Formring 12, an dessen Außenfläche Rillen 17 zur Bildung des geriffelten Abschnittes 5 dienen. Dieser Formring 12 ist im montierten Zustand, wenn als der Stutzen H auf dem Teller aufliegt, um den Stutzen 10 angeordnet Im Stutzen 10, im Gewindeteil und im Formring 12 sind radiale Düsenöffnungen 13 vorgesehen, wobei die Düsenöffnungen 13 jeweils in den einzelnen Rillen 17 des Formringes 12 eingebracht sind. Das Gewindeteil 11 ist an seiner oberen Fläche geschlossen und besitzt dabei einen axial verlaufenden Zapfen 18. An das Gewindeteil 11 schließt sich ein Deckel 20 an, der einen Haltezylinder 21 aufweist, auf den ein Ring 22 mit einer äußeren Riffelung 23 zur Bildung des oberen geriffelten Abschnittes 3 aufgesetzt ist Der Deckel 20 besitzt an seinem Haltezylinder 21 eine Sacklochbohrung 19 bzw. einen Hohlraum 19, dessen Innendurchmesser dem Außendurchmesser des Zapfens 18 entspricht Zur Verbindung des Deckels 20 mit dem Gewindeteil 11 dienen Gewindebohrungen 24 im Haltezylinder 21 und korrespondierende Schraubenbohrungen 25 im Gewindeteil 11.Reference is now made to FIG. Of the The mold core has a base part 7, which is designed as a hollow cylinder and at its lower end a sprocket 8 is attached. Above the chain wheel 8, the base part 7 has a plate 9, the outer diameter of which is larger is than the outer diameter of the base part and whose inner diameter is smaller than the inner diameter of the base part. The mold core also has a threaded part 11 on which a connecting piece 10 is integrally formed can be placed on the interior of the plate 9. To attach the nozzle with the threaded part 11 on the The plate has the latter axially extending through openings 15, whereas the connecting piece iö with threaded holes 16 is provided by means of screws penetrating through the bores 15, the threaded section attached to your plate 9. The mold core has Furthermore, a shaped ring 12, on the outer surface of which grooves 17 are used to form the corrugated section 5. This The form ring 12 is in the assembled state when the nozzle H rests on the plate around the nozzle 10 arranged in the nozzle 10, in the threaded part and in the form ring 12 are provided radial nozzle openings 13, wherein the nozzle openings 13 are each made in the individual grooves 17 of the mold ring 12. That The threaded part 11 is closed on its upper surface and has an axially extending pin 18. A cover 20 adjoins the threaded part 11, which has a holding cylinder 21 on which a ring 22 with an outer corrugation 23 to form the upper Corrugated section 3 is attached. The cover 20 has a blind hole on its holding cylinder 21 19 or a cavity 19, the inner diameter of which corresponds to the outer diameter of the pin 18 To connect the cover 20 to the threaded part 11, threaded bores 24 are used in the holding cylinder 21 and corresponding screw bores 25 in the threaded part 11.

Zur Montage wird demgemäß das Basisteil 7 an der Tiefziehmatrize 14 gelagert Danach -wird der Ring 22 über den Hohlzylinder 21 geschoben und der Deckel 20 zusammen mit dem Ring 22 mittels die Bohrungen 25 durchgreifenden, in die Gewindebohrungen 24 eingeschraubten Schrauben (nicht gezeigt) befestigt Sodann wird der Formring 12 über den Stutzen 10 des Gewindeteils 11 geschoben und die gesamte Einheit mittels Schraubenverbindungen an dem Basisteil 7 befestigt, wobei Schrauben durch die Bohrungen 15 in die Gewindebohrungen 16 geschraubt werden.
Da sowohl der Formring 12 als auch der Ring 22 auf dem Formkern drehbar angebracht sind, brauchen sie beim Drehen des Gewindeteils dessen Bewegung nicht mitzumachen, so daß die Riffelung in den Zonen 3 und 5 beim Entfernen nicht zerstört wird.For assembly, the base part 7 is accordingly stored on the deep-drawing die 14. Thereafter, the ring 22 is pushed over the hollow cylinder 21 and the cover 20 is then fastened together with the ring 22 by means of screws (not shown) that extend through the bores 25 and are screwed into the threaded bores 24 the shaped ring 12 is pushed over the connecting piece 10 of the threaded part 11 and the entire unit is fastened to the base part 7 by means of screw connections, screws being screwed through the bores 15 into the threaded bores 16.
Since both the mold ring 12 and the ring 22 are rotatably mounted on the mold core, they do not need to take part in the movement of the threaded part when it is rotated, so that the corrugation in zones 3 and 5 is not destroyed when it is removed.

Außer der rationelleren Fertigung aus wenig aufwendigem Material und den dabei erzielten geringen Maßtoleranzen ergibt sich durch die Verwendung der vorgeschlagenen Schraubverschlußkappe der Vorteil einer wesentlichen Vereinfachung einer Verschließmaschine, da in einen Rohling kein Gewinde eingewalzt zu werden braucht, sondern ein zangenartiges Element genügt, das die Schraubverschlußkappe in den Rillen des geriffelten Abschnittes 5 hält und auf die Flaschenöffnung aufschraubt. Apart from the more efficient production from less expensive material and the small dimensional tolerances achieved in this way results from the use of the proposed screw cap, the advantage of a substantial simplification of a sealing machine, since no thread has to be rolled into a blank needs, but a pliers-like element is sufficient that the screw cap in the grooves of the fluted Section 5 holds and screwed onto the bottle opening.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 screw caps and a deep-drawing die Patent claims: with several mold cores. Screw cap of the type mentioned at the beginning

1. Screw cap for bottles and the like are known They are generally made of aluminiche Container, with a cap lid, the 5 umblech, which is processed into a blank, on Cap shell at least one corrugated edge the thread after putting on the cap has section, which is rolled onto the bottle in the area of the free end of the.

Cap shell is provided and a Ge Apart from the fact that such a screw threading section between the corrugated section Schluökappe material-consuming and the process and the jacket section in the area of the cap is obvious, the thread on a bottle neck is in The ceiling is arranged as a rule deviating from the ideal circular shape, which is that the individual jacket sections (3, half an absolute tightness of the screw cap 4.5) are tiered against each other and are in the direction of cap especially for carbonated beverages taper from the free edge to the cap lid and is not given it is therefore necessary inside the cap body consists of a plastic film, a layer of plastic must be attached against which the and deep-drawn, the upper edge of the bottle is clamped when screwing in

2. Process for the production of screw connections From DE-OS 24 53 963 is a closure cap Closing caps according to claim 1, characterized by being known, the base body of which is made of metal, that the plastic film is on a die, the inner surface of which in a certain way is deep-drawn, the core of which is the stepped 20 plastic coated Although the inner or cut-out and the thread section of which has the outer diameter of the closure cap

rotatable compared to the rest of the core is younger and has stepped zones, but not has the

3. The method according to claim 2, characterized in accordance with DE-OS 24 53 936 a marked closure cap that deep drawing with the support of windezone; it is screwed onto the bottle Pressure and / or vacuum takes place in that they put the threaded pieces on the bottle in

4. Molding core of a deep-drawing die for producing the sealing beads running in the longitudinal direction Closure cap according to Claim 1, characterized in that it is screwed until a seal has taken place. One indicates that it has the known cap in a recess in the corrugated zone trize (14) rotatably mounted and also not from the underside. The use of plastic is therefore is drivable and that to form the lower 30 ago only one additional, which is only used for sealing

corrugated section of larger diameter a device is used

Form ring (12) is provided, which is a special screw cap of a different shape

tes, about the core longitudinal axis rotatable on the mold core from US-PS 34 18 691 has become known. These are

attached part is formed known cap is made of plastic

5. Molding core according to claim 4, characterized marked 35 and has a thread and tapers over it draws that he is one above the threaded area (11) also upwards. Their shape is nothing else than has lying upper section, the diameter of which is a smooth, conical knife provided with an internal thread smaller than the smallest diameter of the frustum-shaped bowl. Such a screw cap thread is cap is hardly usable as a closure cap for FIa-

6. Molding core according to claim 5, characterized marked 40 see with carbonated liquids, as insbeknown that the upper section as a separate special opening such a cap Form cap is formed, which consists of a ring (22) by hand, which must be required, extremely with external corrugation (23) and a cover (20) with is difficult

the size of the ring opening corresponding holding object of the invention is therefore to provide a screw cylinder (21) consists of 45 locking caps for bottles and similar containers

7. Molding core according to one of claims 4 to 6, create that in its final form immediately • characterized in that it can be made of hollow plastic and the

and can be connected to a vacuum and that at least also for sealing bottles for carbonated

beverages containing at least one can be used in the threads of the threaded portion.

(11) radial nozzle bores (13) are provided. 50 According to the invention, this object is achieved by

8. Mold core according to one of claims 4 to 7, the characterizing features of claim 1.
characterized in that further nozzle bores In contrast to the closure cap according to US-gen (13) in the form ring for the lower corrugated PS 34 18 691, the screw connection section according to the invention is provided. On the one hand, the closing cap can be easily attached to the

9. Molding core according to one of claims 4 to 8, 55 to screw bottle head and on the other hand that is characterized in that it is also used as a drive element to unscrew the closure cap from the bottle has a chain wheel (8) below the die. possible without any problems with carbonated drinks,

10. Deep-drawing die with mold cores according to one, as in the case of claims 4 to 9, which are currently generally on the market, characterized in that metallic screw caps are located,
the mold cores are connected by a common chain with 60 The method for producing a drive motor according to the invention. ßen screw caps is characterized in that the plastic film is deep-drawn from a die

gen, the core of which has the stepped portions

and its threaded portion opposite the rest

65 core is rotatable. The method described in U.S. Pat

The invention relates to a screw cap 34 18 691 is described, is with the inventive

according to the preamble of claim 1, a method ßen method not comparable. There he owns

and a mold core for producing such mold core a bolt-like end that is on its outer