EP1507707B1 - Device for sealing tray-shaped or pot-shaped receptacles - Google Patents
Device for sealing tray-shaped or pot-shaped receptacles Download PDFInfo
- Publication number
- EP1507707B1 EP1507707B1 EP03752703A EP03752703A EP1507707B1 EP 1507707 B1 EP1507707 B1 EP 1507707B1 EP 03752703 A EP03752703 A EP 03752703A EP 03752703 A EP03752703 A EP 03752703A EP 1507707 B1 EP1507707 B1 EP 1507707B1
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- EP
- European Patent Office
- Prior art keywords
- plate
- sealing
- sealing head
- contour
- head
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
- B65B7/2842—Securing closures on containers
- B65B7/2878—Securing closures on containers by heat-sealing
Definitions
- the invention relates to a device for sealing cup-shaped or cup-shaped containers, such as Bliesterpacks or cups for storing dairy products, such as yogurt, quark or creamer, with a sealing head, which has a sealed contour carrier and a heatable sealing contour, a support plate with at least one guide pin, which enables a linear displacement of the sealing head relative to the carrier plate, at least one spring element which acts on the sealing head with a force away from the carrier plate, a spring bearing plate which is arranged between the sealing head and the carrier plate and in the same direction as the sealing head is linearly displaceable, and at which the sealing head facing end of the spring element is applied and a sealing element associated with the sealing head, which allows a tilting of the sealing contour carrier about the axes perpendicular to said guide pin axes.
- a sealing head which has a sealed contour carrier and a heatable sealing contour
- a support plate with at least one guide pin which enables a linear displacement of the sealing head relative to the carrier plate
- Bliesterpacks are used for packaging of small parts, such as tablets, pills or buttons, but also sensitive and relatively expensive items such as contact lenses or electronic components.
- the said packs consist of a more stable plastic shell with bulges, in which the parts to be stored are stored, and a cover sheet, which hermetically seals the bulges.
- the cover film is glued to the shell in the majority of cases and accordingly has an adhesive layer, which is usually thermally activated. The strength of the bond and / or the cover sheet adjusted so that the cover sheet on the one hand sufficiently firmly adhered to the shell, on the other hand can be demolished by the shell but also.
- pasty foods which are dispensed in comparatively small portions, kept in containers, which are closed by an easily removable cover sheet.
- Such packaging can be found for example in yogurt, cottage cheese, creamer or ready-made pudding.
- cover sheet sealing devices For applying the cover sheet sealing devices are used, which generally have several heatable sealing contours.
- the sealing contours thereby falls the task to press the cover sheet with a defined force along the contour of the shell or the cup edge and to glue the cover sheet to the container due to their predetermined higher temperature.
- sealing is understood as meaning processes in which openings in containers are closed by films.
- the general usage sometimes includes the terms welding or gluing.
- a device for sealing Bliesterpacks which consists essentially of a carrier plate and a plurality of sealing heads.
- the support plate bores in which run guide bolts, which in turn are each firmly connected to a sealing head.
- This embodiment allows a linear displacement of the head relative to the support plate, wherein arranged between the head and support plate, each comprising the bolts springs act on the sealing heads each with a directed away from the support plate spring force.
- the sealing heads each carry a heatable sealing contour plate on their end face directed away from the carrier plate.
- the heater is designed as a semiconductor resistance heating and firmly integrated into the sealing contour plate.
- the determination of the sealing contour plate on the sealing head by means of a gimbal joint, which is formed in the present case as a ball which is arranged between two plate-shaped elements of the sealing head. The ball allows a tilting of the sealing contour plate by small angles, but also a rotation of the sealing contour plate about an axis perpendicular to the contour axis.
- Sealing heads and carrier plate form a unit, which is placed on the cover sheet of the Bliesterpacks to carry out the sealing.
- the sealing heads come to rest after placing the sealing contour on the film, while the support plate is still moved so far relative to the sealing head until the lying between the support plate and sealing elements spring elements produce the desired contact pressure of the sealing contours on the cover sheet.
- the present device according to the prior art has several disadvantages, which lead to frequent disturbances and the stoppage of the packaging system.
- the linear guide the sealing heads by guide pins one end of which is attached to the respective sealing head and the other end runs in each case in a bore of the support plate, has also not been successful.
- the unit of sealing head and guide pin has a long, ranging from the sealing contour to the leading holes in the support plate lever arm. A slight clearance between the bore and guide pin therefore causes the sealing contour can perform significant lateral movements. These movements also prevent an exact alignment of the sealing contour relative to the bulge in the lower plastic shell.
- the long lever arm also causes tilting of the guide pins can occur in the guide holes.
- the tilting cause increased friction between the bolt and bore, the size of which, however, is undefined.
- the contact pressure of the sealing contour on the cover sheet is variable from contour to contour as well as in one and the same contour from operation to operation fluctuates. The quality of the seal is thereby reduced disadvantageously.
- the invention has the object to provide a device for sealing Bliesterpacks, which avoids the disadvantages mentioned, allows a simple and quick adjustment of the contact pressure of the sealing contour, an improved Seal quality and has a low susceptibility to failure and correspondingly low cost of repair and maintenance.
- the device according to an advantageous embodiment is based on sealing devices according to the prior art, which are equipped with guide pins and spring elements which comprise the bolts and are arranged between the carrier plate and a spring bearing plate adjacent to the sealing head.
- the spring bearing plate is provided with holes in the device according to the invention, so that they can move relative to and along the guide pins, and - in the same way as the sealing head - can perform a linear displacement. The position of the spring bearing plate relative to the carrier plate determines the length of a spring element and thus its bias.
- the spring bearing plate is designed so that its position is adjustable.
- a freely accessible adjusting element is provided between the sealing head and spring bearing plate, by means of which the distance between the spring bearing plate relative to the sealing head and thus also relative to the carrier plate is changeable.
- a displacement of the bearing plate in the direction of the carrier plate leads to an increase, a shift away from the carrier plate to a lowering of the spring preload.
- the spring preload in turn determines after placing the sealing head on the cover sheet of Bliesterpackung the pressure exerted by the sealing contour on the cover sheet contact pressure.
- the said adjusting element thus makes it possible to fix the contact pressure existing during the sealing and to carry out the fixing quickly and easily.
- this adjustment is freely accessible, so that the adjustment of the contact pressure can be done in the installed state of the sealing head.
- said adjusting element comprises a one-armed lever which is articulated on the sealing head (or the spring bearing plate), wherein the first lever arm with its free end against the spring bearing plate (or the sealing head) and the second. Press lever arm with its free end against an adjusting screw.
- the adjusting screw is arranged so that it is operable from the carrier plate facing away from the end face of the sealing head.
- the articulation point of the lever is arranged in an edge region of the sealing head and the adjusting screw in the opposite edge region of the sealing head and the free end of a lever arm in the region of the sealing head axis lies.
- the design of the adjusting screw allows numerous possibilities.
- a solution in which the adjusting screw comprises a displaceable in the direction of the axis of the cylinder pin and a threaded pin with hexagon head.
- the cylindrical pin is arranged between the said lever and the said threaded pin, while the threaded pin protrudes from the associated threaded bore and in the region of the head with a lock nut can be fixed.
- only a few steps are necessary to adjust the spring preload in an advantageous manner. They consist of loosening the lock nut, adjusting the set screw by the required number of turns and then fixing the lock nut again.
- the seal contour carrier must ensure that the seal contour is always aligned parallel to the surface of the cover sheet under all working conditions. Accordingly, the sealing devices usually have a joint element that allows tilting of the sealing contour plate by small angles.
- this element is formed according to a feature of the invention as a rubber bearing, with two metal plates and an intermediate rubber layer, wherein the plates are vulcanized or glued.
- This design of the joint element allows on the one hand a tilting of the sealing contour in all directions perpendicular to the longitudinal axis of the sealing head, but on the other hand does not allow any rotation of the contour about the said longitudinal axis.
- the proposed solution thus ensures that the sealing contour is always aligned parallel to the surface of the cover sheet and in the azimuthal direction always has an exact alignment relative to the bulge in the lower plastic shell. Both properties mean that with the device according to the present invention high-quality seals can be produced.
- each bolt is provided with a groove with vane tail edge, which serve to fix the rubber bearing on the adjacent elements.
- at least one threaded screw is provided in the sealing head and in the sealing contour carrier which can be screwed against said flank.
- Bolt, dovetail groove and said screws together constitute a quick-release system, which allows a simple and secure fixing of the rubber bearing to its neighboring elements by simple means.
- the proposed structural measures bring in particular the advantage that the rubber bearing is easily replaceable in case of repair.
- the disclosed quick-release system additionally provides a safeguard against rotation of the rubber mount.
- a bore is mounted in each of the metal plate outside the axis of the rubber bearing, in which in each case one on the sealing head or sealing contour carrier attached zylinderischer centering pin engages. The latter constructive measures together lead to a play and torsion-free down the rubber bearing, which have a high Siegei Struktur result.
- the heatable sealing contour is constructed from an independent contour plate and an independent heating plate.
- both plates are releasably connected to each other and releasably secured to the sealing contour carrier.
- This training leads to an essential improvement in maintenance and repair, since in case of failure of the heater or the thermostat only the hot plate must be replaced.
- the complete unit consisting of sealing heads and support plate need not be removed, but only specifically the defective heating plate. Since the contour plate and the heating plate are detachably connected to each other, the removal and installation of the two elements requires little time and is in particular feasible without removing further elements of the device.
- the heating plate is designed as a flat heater, preferably as a ceramic flat heater, or heating plate with heating cartridge.
- a material for the heating plate and / or also for the flat heaters copper and / or aluminum are particularly preferred because of their thermal conductivity. Both versions have a very long service life, so that an exchange of this element is required only in relatively large periods. Long downtimes of the packaging system and thus high production losses due to failed heating elements are practically excluded from the outset in the present device.
- the contour plate made of hardened material or a material resistant to aggressive substances, preferably stainless steel, is formed.
- At least one thermally insulating layer is provided according to a feature of the invention between the heating plate and the joint element.
- a preferred embodiment of the present invention also provides a deviating from the prior art solution.
- said guide pins are fixed rigidly in a base plate fixed to the support plate and the linear displacement of the sealing head relative to the base plate is effected by a displacement of the sealing head relative to the guide pins.
- the sealing head accordingly has holes in which ball bushings are provided, which in turn run on the guide pins.
- the laying of the support point of the guide pins in comparison to the prior art result in a shorter lever arm, so that the leading to tilt the bolt moments that give rise to resistance to movement, are largely reduced.
- the ball bushings cause a smooth running of the Movement of the bolts that allow to realize a short stroke.
- the equipment of the sealing head with ball bushings also brings a substantial elimination of the friction between the guide pin and sealing head with a Linerarverschiebung the sealing head with it, and thereby also avoids undefined effects on the contact pressure of the sealing contour.
- the proposed design ensures easy interchangeability of the seal series and the sealed package. Together with the above-mentioned measures, which ensure a simple replacement of the essential individual elements, thereby a high maintenance, maintenance and user-friendliness is achieved.
- the proposed design also allows easy measurement and adjustment of the required temperatures and the force to be exerted by the sealing head on the pack to be sealed. For this purpose, a measuring device with sensors for each seal contour plate placed on the seal package, the actual values of the temperature and the contact pressure determined and then the heating and the lever adjustment Individually adjusted with each seal head to the respective setpoints.
- FIG. 1 the basic structure of a structural unit is to be taken, which is led under the above-mentioned designation sealing position. It represents a complete unit for producing a sealing contour and comprises the following elements: contour plate 1, heating plate 2, insulating plate 3, hinge element 4, sealing head 5, lever element 6, spring bearing plate 7, guide pin 8, spring elements 9, base plate 10, support plate 11.
- the guide pins 8 are rigidly fixed in the base plate 10, wherein the base plate in turn is detachably mounted on the support plate 11.
- the spring elements 9 are formed as helical springs which comprise the bolts 8 and are arranged in the space between the base plate 10 and the spring bearing plate 7.
- the spring bearing plate 7 bores 12, which allow a relative to the guide pin 8 relative displacement of the bearing plate 7.
- a displacement of the bearing plate 7 in the direction of the support plate 11 leads to a shortening of the springs 9 and consequently to an increase in the spring preload.
- the displacement of the bearing plate 7 can be caused by a one-armed lever element 6, which is articulated at the point 13 on the sealing head 5.
- the lever is designed so that its first lever arm with his free end 14 presses against the spring bearing plate 7 and the second lever arm with its free end 15 against an adjusting screw whose position is indicated in the present illustration by the dash-dotted line 16.
- the position is chosen so that the adjusting screw from the end face 17 of the sealing head 5 is operable.
- ball bushings are shown, which are arranged in bores corresponding diameter of the sealing head 5. They allow after placing the sealing head on the cover sheet 19 of the Bliesterpacks 20 a linear displacement of the sealing head 5 on the guide pin 8 in the direction of the support plate 11 to. The force generated by the bias of the spring elements 9 in this case transfers to the contour plate 1 and ensures a uniform contact pressure to the cover sheet 19th
- the present device is therefore equipped with a hinge element 4, which consists of two metal plates 20, 20 'and a rubber layer 21 enclosed between the plates. This element allows tilting of the contour plate 1 about the directions perpendicular to the axis 22 of the device, but does not permit rotation about said axis.
- the rubber bearing 4 thus ensures that the contour plate 1 is always aligned parallel to the surface of the cover sheet 19 and thereby undergoes no rotation about the axis 22.
- the rubber bearing 4 receives the sealing contour carrier 23 with the actual necessary for sealing elements. These include the contour plate 1 and the heating plate 2. Both components are designed as separate elements and releasably connected to each other. In order to prevent the heat flow from these two elements in the direction of rubber bearing 4, a thermally insulating plate 3 is provided between the heating plate 2 and the joint element 4.
- proposed device ensures a simple and fast adjustment of the contact pressure, a high quality seal, optimal accessibility to all components and low susceptibility to interference.
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- Engineering & Computer Science (AREA)
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- Control And Other Processes For Unpacking Of Materials (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung zum Versiegeln von schalen- oder becherförmigen Behältnissen, wie zum Beispiel Bliesterpacks oder Bechern zum Aufbewahren von Molkereiprodukten, wie Joghurt, Quark oder Kaffeesahne, mit einem Siegelkopf, der einen Siegelkonturträger und eine beheizbare Siegelkontur aufweist, einer Trägerplatte mit wenigstens einem Führungsbolzen, der eine Linearverschiebung des Siegelkopfes relativ zur Trägerplatte ermöglicht, wenigstens einem Federelement, das den Siegelkopf mit einer von der Trägerplatte wegweisenden Kraft beaufschlagt, einer Federlagerplatte, die zwischen Siegelkopf und Trägerplatte angeordnet ist und in gleicher Richtung wie der Siegelkopf linearverschieblich ist, und an der das zum Siegelkopf weisendes Ende des Federelementes anliegt und einem dem Siegelkopf zugeordneten Gelenkelement, das eine Verkippung des Siegelkonturträgers um die senkrecht zu genannten Führungsbolzen liegenden Achsen ermöglicht. Eine derartige Vorrichtung ist aus der
Zur Verpackung von Kleinteilen, wie beispielsweise Tabletten, Pillen oder Knöpfen, aber auch empfindlichen und vergleichsweise teueren Einzelteilen wie Kontaktlinsen oder elektronischen Bauelementen, werden Bliesterpacks genutzt. Die genannten Packs bestehen aus einer stabileren Kunststoffschale mit Ausbuchtungen, in denen die zu verwahrenden Teile abgelegt sind, und einer Deckfolie, welche die Ausbuchtungen hermetisch abschließt. Die Deckfolie ist in der Mehrzahl der Fälle auf die Schale aufgeklebt und weist dementsprechend eine Klebeschicht auf, die in der Regel thermisch aktivierbar ist. Die Festigkeit der Verklebung und/oder der Deckfolie so dabei eingestellt, daß die Deckfolie einerseits hinreichend fest an der Schale haftet, andererseits von der Schale aber auch abgerissen werden kann.For packaging of small parts, such as tablets, pills or buttons, but also sensitive and relatively expensive items such as contact lenses or electronic components, Bliesterpacks are used. The said packs consist of a more stable plastic shell with bulges, in which the parts to be stored are stored, and a cover sheet, which hermetically seals the bulges. The cover film is glued to the shell in the majority of cases and accordingly has an adhesive layer, which is usually thermally activated. The strength of the bond and / or the cover sheet adjusted so that the cover sheet on the one hand sufficiently firmly adhered to the shell, on the other hand can be demolished by the shell but also.
In gleicher Weise werden auch pastöse Lebensmittel, die in vergleichsweise kleinen Portionen abgegeben werden, in Behältern aufbewahrt, die durch einen leicht entfernbare Deckfolie verschlossen sind. Derartige Verpackungen findet man beispielsweise bei Jogurt, Quark, Kaffeesahne oder Fertigpudding.In the same way pasty foods, which are dispensed in comparatively small portions, kept in containers, which are closed by an easily removable cover sheet. Such packaging can be found for example in yogurt, cottage cheese, creamer or ready-made pudding.
Zum Aufbringen der Deckfolie werden Versiegelungsvorrichtungen eingesetzt, die in der Regel mehrere heizbare Siegelkonturen aufweisen. Den Siegelkonturen fällt dabei die Aufgabe zu, die Deckfolie mit einer definierten Kraft entlang der Kontur an die Schale oder den Becherrand anzudrücken und infolge ihrer vorgegebenen höheren Temperatur die Deckfolie mit dem Behältnis zu verkleben. Unter Versiegeln im Sinne vorliegender Erfindung werden hierbei Vorgänge verstanden, bei denen Öffnungen in Behältnissen durch Folien verschlossen werden. Der allgemeine Sprachgebrauch sieht hierfür mitunter auch die Begriffe Verschweißen oder Verkleben vor.For applying the cover sheet sealing devices are used, which generally have several heatable sealing contours. The sealing contours thereby falls the task to press the cover sheet with a defined force along the contour of the shell or the cup edge and to glue the cover sheet to the container due to their predetermined higher temperature. For the purposes of the present invention, sealing is understood as meaning processes in which openings in containers are closed by films. The general usage sometimes includes the terms welding or gluing.
Im Stand der Technik ist eine Vorrichtung zur Versiegelung von Bliesterpacks bekannt, die im wesentlichen aus einer Trägerplatte und mehreren Siegelköpfen besteht. Dabei weist die Trägerplatte Bohrungen auf, in denen Führungsbolzen laufen, die ihrerseits jeweils fest mit einem Siegelkopf verbunden sind. Diese Ausführung ermöglicht einer Linearverschiebung des Kopfes relativ zur Trägerplatte, wobei zwischen Kopf und Trägerplatte angeordnete, jeweils die Bolzen umfassende Federn die Siegelköpfe jeweils mit einer von der Trägerplatte weg gerichteten Federkraft beaufschlagen.In the prior art, a device for sealing Bliesterpacks is known, which consists essentially of a carrier plate and a plurality of sealing heads. In this case, the support plate bores in which run guide bolts, which in turn are each firmly connected to a sealing head. This embodiment allows a linear displacement of the head relative to the support plate, wherein arranged between the head and support plate, each comprising the bolts springs act on the sealing heads each with a directed away from the support plate spring force.
Die Siegelköpfe tragen an ihrer von der Trägerplatte weg gerichteten Stirnseite jeweils eine beheizbare Siegelkonturplatte. Bei vorliegender Vorrichtung nach dem Stand der Technik ist die Heizung als Halbleiter-Widerstandsheizung ausgebildet und fest in die Siegelkonturplatte integriert. Die Festlegung der Siegelkonturplatte am Siegelkopf erfolgt mittels eines kardanschen Gelenks, das im vorliegenden Fall als Kugel ausgebildet ist, die zwischen zwei plattenförmigen Elementen des Siegelkopfes angeordnet ist. Die Kugel ermöglicht ein Verkippen der Siegelkonturplatte um kleine Winkel, aber auch eine Verdrehung der Siegelkonturplatte um eine senkrecht zur Kontur liegende Achse.The sealing heads each carry a heatable sealing contour plate on their end face directed away from the carrier plate. In the present device according to the prior art, the heater is designed as a semiconductor resistance heating and firmly integrated into the sealing contour plate. The determination of the sealing contour plate on the sealing head by means of a gimbal joint, which is formed in the present case as a ball which is arranged between two plate-shaped elements of the sealing head. The ball allows a tilting of the sealing contour plate by small angles, but also a rotation of the sealing contour plate about an axis perpendicular to the contour axis.
Siegelköpfe und Trägerplatte bilden eine Einheit, die zur Durchführung der Versiegelung auf die Deckfolie des Bliesterpacks aufgesetzt wird. Bei diesem Vorgang kommen die Siegelköpfe nach dem Aufsetzten der Siegelkontur auf der Folie jeweils zur Ruhe, während die Trägerplatte relativ zu den Siegelkopf noch soweit verschoben wird, bis die zwischen Trägerplatte und Siegelköpfen liegenden Federelemente den gewünschten Anpreßdruck der Siegelkonturen auf der Deckfolie erzeugen.Sealing heads and carrier plate form a unit, which is placed on the cover sheet of the Bliesterpacks to carry out the sealing. In this process, the sealing heads come to rest after placing the sealing contour on the film, while the support plate is still moved so far relative to the sealing head until the lying between the support plate and sealing elements spring elements produce the desired contact pressure of the sealing contours on the cover sheet.
Vorliegende Vorrichtung nach dem Stand der Technik weist etliche Nachteile auf, die zu häufigen Störungen und zum Stillstand der Verpackungsanlage führen.The present device according to the prior art has several disadvantages, which lead to frequent disturbances and the stoppage of the packaging system.
Wie die Praxis gezeigt hat, liegt ein wesentlicher Grund für die Ausfälle in der Konstruktion der Heizung begründet. Ein Problem bereitet hierbei insbesondere die Kontaktierung des Widerstandselementes, welche der permanenten Hitze nicht standhält. Darüber hinaus erweist sich auch die Standzeit der Halbleiter als unzureichend klein. Die nachteilige Folge hiervon ist, daß die Heizung oft ausfällt und in folge dessen häufig ausgetauscht werden muß. Da Siegelkontur und Heizung jedoch als eine Einheit ausgebildet sind, die zudem in eingebautem Zustand des Siegelkopfes nicht ausbaubar ist, muß zu einem Wechsel der beheizbaren Siegelkontur die komplette aus Siegelköpfen und Trägerplatte bestehende Einheit ausgebaut werden. Mit der Demontage ist ein erheblicher Aufwand verbunden, der einerseits kostenintensiv ist und zudem zu Stillstandszeiten der Verpackungsanlage und damit zu hohen Produktionsausfällen führt.As practice has shown, a significant reason for the failures in the design of the heater is justified. A particular problem in this case is the contacting of the resistance element, which does not withstand the permanent heat. In addition, the service life of the semiconductor proves to be insufficiently small. The disadvantageous consequence of this is that the heater often fails and must be frequently replaced as a result. However, since sealing contour and heating are formed as a unit, which is also not removable in the installed state of the sealing head, must be removed to a change of heatable sealing contour the complete unit consisting of sealing heads and carrier plate. With the disassembly a considerable effort is associated, on the one hand is costly and also leads to downtime of the packaging system and thus high production losses.
Als Nachteil bei der Vorrichtung nach dem Stand der Technik hat sich auch deren unzureichende mechanische Stabilität erwiesen. Die Festlegung der Siegelkonturplatte am Siegelkopf mittels eines Kugelgelenks ermöglicht zwar eine ggf. notwendige Ausrichtung der Siegelkontur parallel zur Oberfläche der Deckfolie, läßt andererseits aber auch eine Verdrehung der Siegelkonturplatte um eine senkrecht zur Kontur liegende Achse zu. Letztere Bewegungsmöglichkeit ist jedoch von besonderem Nachteil, da sie eine exakte Ausrichtung der Siegelkontur relativ zur Ausbuchtung in der unteren Kunststoffschale verhindert.A disadvantage of the device according to the prior art, also their inadequate mechanical stability has been found. Although the determination of the sealing contour plate on the sealing head by means of a ball joint allows any necessary alignment of the sealing contour parallel to the surface of the cover sheet, but on the other hand also allows a rotation of the sealing contour plate about an axis perpendicular to the contour axis. The latter possibility of movement is however of special Disadvantage, since it prevents an exact alignment of the sealing contour relative to the bulge in the lower plastic shell.
Probleme bereitet bei genannter Vorrichtung auch die exakte Einstellung des Anpreßdrucks der Siegelkontur an die Deckfolie. Hierzu muß der Federweg des betreffenden Federelementes mittels Schrauben, die in axialer Richtung der Feder wirken, verstellt werden. Da diese Schrauben jedoch schwer zugänglich sind, ist diese Einstellung mit erheblichem Aufwand verbunden, und in besonders nachteiliger Weise während des Betriebes überhaupt nicht durchführbar.Problems with this device also causes the exact adjustment of the contact pressure of the sealing contour on the cover sheet. For this purpose, the spring travel of the relevant spring element by means of screws which act in the axial direction of the spring must be adjusted. However, since these screws are difficult to access, this setting is associated with considerable effort, and in a particularly disadvantageous manner during operation is not feasible.
Die Linearführung der Siegelköpfe durch Führungsbolzen, deren eines Ende jeweils am Siegelkopf befestigt ist und deren anderes Ende jeweils in einer Bohrung der Trägerplatte läuft, hat sich ebenfalls nicht bewährt. Bei dieser Ausbildung besitzt die Einheit aus Siegelkopf und Führungsbolzen einen langen, von der Siegelkontur bis zu den führenden Bohrungen in der Trägerplatte reichenden Hebelarm. Ein geringfügiges Spiel zwischen Bohrung und Führungsbolzen führt daher dazu, daß die Siegelkontur erhebliche Lateralbewegungen ausführen kann. Diese Bewegungen verhindern ebenfalls eine exakte Ausrichtung der Siegelkontur relativ zur Ausbuchtung in der unteren Kunststoffschale.The linear guide the sealing heads by guide pins, one end of which is attached to the respective sealing head and the other end runs in each case in a bore of the support plate, has also not been successful. In this embodiment, the unit of sealing head and guide pin has a long, ranging from the sealing contour to the leading holes in the support plate lever arm. A slight clearance between the bore and guide pin therefore causes the sealing contour can perform significant lateral movements. These movements also prevent an exact alignment of the sealing contour relative to the bulge in the lower plastic shell.
Darüber hinaus führt der lange Hebelarm auch dazu, daß Verkantungen der Führungsbolzen in den Führungsbohrungen auftreten können. Die Verkantungen bewirken eine erhöhten Reibung zwischen Bolzen und Bohrung, deren Größe jedoch undefiniert ist. Als Folge davon ist der Anpreßdruck der Siegelkontur auf die Deckfolie sowohl von Kontur zu Kontur als auch bei ein- und derselben Kontur von Arbeitsgang zu Arbeitsgang schwankend. Die Qualität der Versiegelung wird hierdurch in nachteiliger Weise herabgesetzt.In addition, the long lever arm also causes tilting of the guide pins can occur in the guide holes. The tilting cause increased friction between the bolt and bore, the size of which, however, is undefined. As a result, the contact pressure of the sealing contour on the cover sheet is variable from contour to contour as well as in one and the same contour from operation to operation fluctuates. The quality of the seal is thereby reduced disadvantageously.
Vor diesem Hintergrund hat sich die Erfindung die Aufgabe gestellt, einen Vorrichtung zur Versiegelung von Bliesterpacks anzugeben, welche die genannten Nachteile vermeidet, eine einfache und schnelle Einstellung des Anpreßdrucks der Siegelkontur ermöglicht, eine verbesserte Siegelqualität erbringt und eine geringe Störanfälligkeit und dementsprechend geringe Kosten für Reparatur und Wartung aufweist.Against this background, the invention has the object to provide a device for sealing Bliesterpacks, which avoids the disadvantages mentioned, allows a simple and quick adjustment of the contact pressure of the sealing contour, an improved Seal quality and has a low susceptibility to failure and correspondingly low cost of repair and maintenance.
Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.According to the invention this object is achieved by the characterizing features of
Die Vorrichtung gemäß einer vorteilhaften Weiterbildung geht von Versiegelungseinrichtungen nach dem Stand der Technik aus, die mit Führungsbolzen und Federelementen ausgestattet sind, welche die Bolzen umfassen und zwischen der Trägerplatte und einer dem Siegelkopf benachbarten Federlagerplatte angeordnet sind. In Abweichung zum Stand der Technik ist bei der erfindungsgemäßen Vorrichtung die Federlagerplatte mit Bohrungen ausgestattet, so daß sie sich relativ zu und entlang den Führungsbolzen bewegen kann, und dabei - in gleicher Weise wie der Siegelkopf - eine Linearverschiebung ausführen kann. Die Position der Federlagerplatte relativ zur Trägerplatte bestimmt die Länge eines Federelementes und somit dessen Vorspannung.The device according to an advantageous embodiment is based on sealing devices according to the prior art, which are equipped with guide pins and spring elements which comprise the bolts and are arranged between the carrier plate and a spring bearing plate adjacent to the sealing head. In contrast to the prior art, the spring bearing plate is provided with holes in the device according to the invention, so that they can move relative to and along the guide pins, and - in the same way as the sealing head - can perform a linear displacement. The position of the spring bearing plate relative to the carrier plate determines the length of a spring element and thus its bias.
Einer wesentlichen Überlegung einer vorteilhaften Weiterbildung, vorliegender Erfindung entsprechend ist die Federlagerplatte so ausgeführt, daß deren Position einstellbar ist. Zu diesem Zweck ist zwischen Siegelkopf und Federlagerplatte ein frei zugängliches Einstellelement vorgesehen, mittels dessen der Abstand der Federlagerplatte relativ zum Siegelkopf und damit auch relativ zur Trägerplatte änderbar ist. Eine Verschiebung der Lagerplatte in Richtung auf die Trägerplatte führt dabei zu einer Erhöhung, eine Verschiebung von der Trägerplatte weg zu einer Erniedrigung der Federvorspannung. Die Federvorspannung ihrerseits bestimmt nach dem Aufsetzten des Siegelkopfes auf der Deckfolie der Bliesterpackung den von der Siegelkontur auf die Deckfolie ausgeübten Anpreßdruck. Das genannte Einstellelement erlaubt folglich, den bei der Versiegelung vorliegenden Anpreßdruck festzulegen, und die Festlegung schnell und auf einfache Weise durchzuführen. Von großen Vorteil hierbei ist, daß dieses Einstellelement frei zugänglich ist, so daß die Einstellung des Anpreßdrucks in eingebautem Zustand des Siegelkopfes erfolgen kann.An essential consideration of an advantageous development, according to the present invention, the spring bearing plate is designed so that its position is adjustable. For this purpose, a freely accessible adjusting element is provided between the sealing head and spring bearing plate, by means of which the distance between the spring bearing plate relative to the sealing head and thus also relative to the carrier plate is changeable. A displacement of the bearing plate in the direction of the carrier plate leads to an increase, a shift away from the carrier plate to a lowering of the spring preload. The spring preload in turn determines after placing the sealing head on the cover sheet of Bliesterpackung the pressure exerted by the sealing contour on the cover sheet contact pressure. The said adjusting element thus makes it possible to fix the contact pressure existing during the sealing and to carry out the fixing quickly and easily. Of great advantage here is that this adjustment is freely accessible, so that the adjustment of the contact pressure can be done in the installed state of the sealing head.
Bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Vorrichtung umfaßt das genannte Verstellelement einen einarmigen Hebel, der am Siegelkopf (bzw. der Federlagerplatte) angelenkt ist, wobei dessen erster Hebelarm mit seinem freien Ende gegen die Federlagerplatte (bzw. den Siegelkopf) und dessen zweiter. Hebelarm mit seinem freien Ende gegen eine Verstellschraube drückt. Dabei ist gemäß einem Merkmal der Erfindung die Verstellschraube so angeordnet, daß sie von der der Trägerplattte abgewandten Stirnseite des Siegelkopfes aus bedienbar ist.In an advantageous embodiment of the device according to the invention said adjusting element comprises a one-armed lever which is articulated on the sealing head (or the spring bearing plate), wherein the first lever arm with its free end against the spring bearing plate (or the sealing head) and the second. Press lever arm with its free end against an adjusting screw. In this case, according to a feature of the invention, the adjusting screw is arranged so that it is operable from the carrier plate facing away from the end face of the sealing head.
Durch Drehung an der Schraube wird die Neigung des Hebels verändert und damit das freie Ende des ersten Hebelarms mehr oder weniger weit in Achsenrichtung des Siegelkopfes verschoben. Die am freien Endes des genannten Hebelarms anliegende Federlagerplatte (bzw. der Siegelkopf) erfährt hierbei ebenfalls eine translatorische Verschiebung und als Folge davon die Feder eine Änderung von deren Vorspannung. Dabei fällt die Verschiebung der Federlagerplatte um das Untersetzungsverhältnis der beiden Hebelarme geringer aus als die Positionsänderung der Einstellschraube. Die vorgeschlagene Ausführung erlaubt daher in vorteilhafter Weise eine sehr feine Einstellung der Federvorspannung.By rotation on the screw, the inclination of the lever is changed, and thus the free end of the first lever arm moved more or less in the axial direction of the sealing head. The voltage applied to the free end of said lever arm spring bearing plate (or the sealing head) in this case also undergoes a translational displacement and as a result of the spring a change in the bias. The displacement of the spring bearing plate by the reduction ratio of the two lever arms is smaller than the change in position the adjusting screw. The proposed design therefore advantageously allows a very fine adjustment of the spring preload.
Bei der Festlegung der geometrischen Daten des Hebels wird vorgeschlagen, daß der Anlenkpunkt des Hebels in einem Randbereich des Siegelkopfes und die Verstellschraube im gegenüberliegenden Randbereich des Siegelkopfes angeordnet ist und das freie Ende des einen Hebelarms im Bereich der Siegelkopfachse liegt.Diese Ausbildung erlaubt eine sehr präzise Einstellung des Anpreßdrucks der Siegelkontur auf der Deckfolie des Bliesterpacks, typische Werte bei Vorrichtungen in der Praxis liefern eine Änderung der Federvorspannung um ca. 25 Newton pro Umdrehung.In the determination of the geometric data of the lever is proposed that the articulation point of the lever is arranged in an edge region of the sealing head and the adjusting screw in the opposite edge region of the sealing head and the free end of a lever arm in the region of the sealing head axis lies. This training allows a very precise Adjustment of the contact pressure of the sealing contour on the cover sheet of the Blister pack, typical values in practical devices provide a change in the spring preload by about 25 Newton per revolution.
Die Ausbildung der Verstellschraube läßt zahlreiche Möglichkeiten zu. Bewährt hat sich in Rahmen vorliegender Erfindung eine Lösung , bei der die Verstellschraube einen in Richtung von deren Achse verschiebbaren Zylinderstift und einen Gewindestift mit Innensechskantkopf umfaßt. Dabei ist der Zylinderstift zwischen dem genannten Hebel und dem genannten Gewindestift angeordnet, während der Gewindestift aus der zugeordneten Gewindebohrung herausragt und im Bereich von dessen Kopf mit einer Kontermutter festlegbar ist. Bei dieser Ausgestaltung sind zur Einstellung der Federvorspannung in vorteilhafter Weise nur wenige Handgriffe notwendig. Sie bestehen darin, die Kontermutter zu lösen, den Gewindestift um die erforderliche Anzahl von Umdrehungen zu verstellen und anschließend die Kontermutter wieder festzulegen.The design of the adjusting screw allows numerous possibilities. Has proven useful in the context of the present invention, a solution in which the adjusting screw comprises a displaceable in the direction of the axis of the cylinder pin and a threaded pin with hexagon head. In this case, the cylindrical pin is arranged between the said lever and the said threaded pin, while the threaded pin protrudes from the associated threaded bore and in the region of the head with a lock nut can be fixed. In this embodiment, only a few steps are necessary to adjust the spring preload in an advantageous manner. They consist of loosening the lock nut, adjusting the set screw by the required number of turns and then fixing the lock nut again.
Für die Qualität der Versiegelung ist neben einem exakt dosierten Anpreßdruck auch eine saubere Auflage der Siegelkontur auf der Deckfolie des Bliesterpacks von entscheidender Bedeutung. Der Siegelkonturträger muß dabei sicherstellen, daß die Siegelkontur unter allen Arbeitsbedingungen stets parallel zur Oberfläche der Deckfolie ausgerichtet ist. Dementsprechend weisen die Versiegelungsvorrichtungen in aller Regel ein Gelenkelement auf, das ein Verkippen der Siegelkonturplatte um kleine Winkel zuläßt.For the quality of the seal in addition to a precisely metered contact pressure and a clean circulation of the sealing contour on the cover sheet of the Bliesterpacks is of crucial importance. The seal contour carrier must ensure that the seal contour is always aligned parallel to the surface of the cover sheet under all working conditions. Accordingly, the sealing devices usually have a joint element that allows tilting of the sealing contour plate by small angles.
Bei der vorgeschlagenen Vorrichtung ist dieses Element gemäß einem Merkmal der Erfindung als Gummilager ausgebildet, mit zwei Metalltellern und einer dazwischen liegenden Gummischicht, wobei die Teller aufvulkanisiert oder aufgeklebt sind. Diese Ausbildung des Gelenkelementes ermöglicht einerseits ein Verkippen der Siegelkontur in alle Richtungen senkrecht zur Längsachse des Siegelkopfes, läßt andererseits aber keinerlei Verdrehung der Kontur um genannte Längsachse zu. Die vorgeschlagene Lösung stellt somit sicher, daß die Siegelkontur stets parallel zur Oberfläche der Deckfolie ausgerichtet ist und in azimutaler Richtung stets eine exakte Ausrichtung relativ zur Ausbuchtung in der unteren Kunststoffschale aufweist. Beide Eigenschaften führen dazu, daß mit der Vorrichtung gemäß vorliegender Erfindung qualitativ hochwertige Versiegelungen herstellbar sind.In the proposed device this element is formed according to a feature of the invention as a rubber bearing, with two metal plates and an intermediate rubber layer, wherein the plates are vulcanized or glued. This design of the joint element allows on the one hand a tilting of the sealing contour in all directions perpendicular to the longitudinal axis of the sealing head, but on the other hand does not allow any rotation of the contour about the said longitudinal axis. The proposed solution thus ensures that the sealing contour is always aligned parallel to the surface of the cover sheet and in the azimuthal direction always has an exact alignment relative to the bulge in the lower plastic shell. Both properties mean that with the device according to the present invention high-quality seals can be produced.
Bei der Ausgestaltung des Gummilagers wird vorgeschlagen, die beiden Metallteller auf der von der Gummischicht wegweisenden Seite jeweils mit einem zur Achse des Gummilagers konzentrischen Bolzen auszustatten, der jeweils in eine Bohrung gleichen Durchmessers im Siegelkopf bzw. Siegelkonturträger eingreift. Gemäß Vorschlag ist jeder Bolzens mit einer Nut mit Schalbenschwanzflanke versehen, die zur Festlegung des Gummilagers an deren Nachbarelementen dienen. Dazu ist im Siegelkopf und im Siegelkonturträger jeweils wenigsten eine Gewindeschraube vorgesehen, welche gegen die genannte Flanke schraubbar sind. Bolzen, Schwalbenschwanznut und genannte Schrauben zusammen stellen ein Schnellspannsystem dar, das mit einfachen Mitteln eine sichere und positionsgenaue Festlegung des Gummilagers an deren Nachbarelementen ermöglicht. Die vorgesehenen konstruktiven Maßnahmen bringen insbesondere den Vorteil mit sich, daß das Gummilager im Reparaturfall leicht auswechselbar ist.In the embodiment of the rubber bearing is proposed to equip the two metal plates on the side facing away from the rubber layer each with a concentric to the axis of the rubber bearing bolt, which engages in a bore of the same diameter in the sealing head or Siegelkonturträger. According to the proposal, each bolt is provided with a groove with vane tail edge, which serve to fix the rubber bearing on the adjacent elements. For this purpose, in each case at least one threaded screw is provided in the sealing head and in the sealing contour carrier which can be screwed against said flank. Bolt, dovetail groove and said screws together constitute a quick-release system, which allows a simple and secure fixing of the rubber bearing to its neighboring elements by simple means. The proposed structural measures bring in particular the advantage that the rubber bearing is easily replaceable in case of repair.
In einer vorteilhaften Weiterbildung der erfindungsgemäßen Vorrichtung weist das dargelegte Schnellspannsystem zusätzliche eine Sicherung gegen Verdrehung des Gummilagers auf. Bei dieser Ausgestaltung ist in jedem der Metallteller außerhalb der Achse des Gummilagers eine Bohrung angebracht, in welche jeweils ein am Siegelkopf bzw. Siegelkonturträger befestigter zylinderischer Zentrierstift eingreift. Die letztgenannten konstruktiven Maßnahmen zusammen führen insgesamt zu einer spiel- und verdrehungsfreien Festlegung des Gummilagers, die eine hohe Siegeiqualität zur Folge haben.In an advantageous development of the device according to the invention, the disclosed quick-release system additionally provides a safeguard against rotation of the rubber mount. In this embodiment, a bore is mounted in each of the metal plate outside the axis of the rubber bearing, in which in each case one on the sealing head or sealing contour carrier attached zylinderischer centering pin engages. The latter constructive measures together lead to a play and torsion-free down the rubber bearing, which have a high Siegeiqualität result.
Die im Rahmen einer vorteilhaften Weiterbildung vorliegender Erfindung vorgeschlagenen konstruktiven Maßnahmen zur Verbesserung der Siegelqualität und zur Verringerung der Störanfälligkeit umfassen auch die Heizung der Siegelkontur. Wie bereits kurz dargelegt ist bei der Vorrichtung die beheizbare Siegelkontur aus einer eigenständige Konturplatte und einer eigenständigen Heizplatte aufgebaut. Gemäß einem bevorzugten Merkmal der Erfindung sind beide Platten lösbar miteinander verbunden und lösbar am Siegelkonturträger befestigt. Diese Ausbildung führt zu einer essentiellen Verbesserung bei Wartung und Reparatur, da im Falle eines Defektes der Heizung oder des Thermostats nur die Heizplatte ausgetauscht werden muß. Dazu muß nicht, wie bei Siegeleinrichtungen nach dem Stand der Technik, die komplette aus Siegelköpfen und Trägerplatte bestehende Einheit ausgebaut werden, sondern nur gezielt die defekte Heizplatte. Da die Konturplatte und die Heizplatte lösbar miteinander verbunden sind, erfordert der Aus- und Einbau der beiden Elemente nur geringen zeitlichen Aufwand und ist insbesondere ohne Ausbau weiterer Elemente der Vorrichtung durchführbar.The proposed in the context of an advantageous development of the present invention constructive measures to improve the seal quality and to reduce the susceptibility include heating the sealing contour. As already briefly stated, in the device the heatable sealing contour is constructed from an independent contour plate and an independent heating plate. According to a preferred feature of the invention, both plates are releasably connected to each other and releasably secured to the sealing contour carrier. This training leads to an essential improvement in maintenance and repair, since in case of failure of the heater or the thermostat only the hot plate must be replaced. For this purpose, as with sealing devices according to the prior art, the complete unit consisting of sealing heads and support plate need not be removed, but only specifically the defective heating plate. Since the contour plate and the heating plate are detachably connected to each other, the removal and installation of the two elements requires little time and is in particular feasible without removing further elements of the device.
Eine besonders bevorzugte Weiterbildung der erfindungsgemäßen Vorrichtung ermöglicht darüber hinaus auch eine drastische Verringerung der Zahl der Reparaturfälle. Bei dieser Ausführung ist die Heizplatte als Flachheizer, vorzugsweise als Keramik-Flachheizer, oder Heizplatte mit Heizpatrone ausgebildet. Als Material für die Heizplatte und/oder auch für die Flachheizer sind aufgrund ihrer Wärmeleitfähigkeit Kupfer und/oder Aluminium besonders bevorzugt. Beide Ausführungen weisen eine sehr hohe Standzeit auf, so daß ein Austausch dieser Element nur in vergleichsweise großen Zeitabschnitten erforderlich ist. Lange Stillstandszeiten der Verpackungsanlage und damit hohe Produktionsausfälle infolge von ausgefallenen Heizelementen werden bei vorliegenden Vorrichtung somit von vorne herein praktisch ausgeschlossen.A particularly preferred development of the device according to the invention also allows a drastic reduction in the number of repair cases. In this embodiment, the heating plate is designed as a flat heater, preferably as a ceramic flat heater, or heating plate with heating cartridge. As a material for the heating plate and / or also for the flat heaters copper and / or aluminum are particularly preferred because of their thermal conductivity. Both versions have a very long service life, so that an exchange of this element is required only in relatively large periods. Long downtimes of the packaging system and thus high production losses due to failed heating elements are practically excluded from the outset in the present device.
Dem gleichen Ziel die Standzeit der Vorrichtung insgesamt möglichst weit zu erhöhen, dienen auch weitere konstruktive Maßnahmen. Diese sehen vor, daß die Konturplatte aus gehärtetem Material oder aus einem gegen aggressive Substanzen resistenten Material, vorzugsweise rostfreiem Stahl, ausgebildet ist. Damit werden die Standzeit der Kontur, die Widerstandsfähigkeit gegen mechanische Beanspruchung und die Beständigkeit gegen aggressive Stoffe, die beim Versiegeln ggf. aus den Ausbuchtungen der unteren Schale austreten können, ebenfalls auf einen hohen Wert angehoben.The same goal to increase the lifetime of the device as much as possible, also serve other design measures. These provide that the contour plate made of hardened material or a material resistant to aggressive substances, preferably stainless steel, is formed. Thus, the life of the contour, the resistance to mechanical stress and the resistance to aggressive substances that may emerge from the protrusions of the lower shell during sealing, also raised to a high value.
Die übliche Temperaturen bei der Versiegelung von Bliesterpacks liegen bei etwa 200 Grad Celsius. Diese Temperatur wird während des Betriebes der Vorrichtung an der Konturplatte permanent aufrechterhalten. Um einen Wärmeabfluß in die unterhalb des Siegelkonturträgers angeordneten Elemente zu verhindern, der einerseits zu einem unerwünschten Energieverlust führen und andererseits Bauelemente des Siegelkopfes thermisch überlasten würden, ist gemäß einem Merkmal der Erfindung zwischen Heizplatte und dem Gelenkelement wenigstens eine thermisch isolierende Schicht vorgesehen.The usual temperatures for sealing Bliesterpacks are around 200 degrees Celsius. This temperature is permanently maintained during operation of the device on the contour plate. In order to prevent heat dissipation into the arranged below the sealing contour element elements, on the one hand lead to an undesirable energy loss and on the other hand thermally overload components of the sealing head, at least one thermally insulating layer is provided according to a feature of the invention between the heating plate and the joint element.
Bei der Ausbildung des Linerarführungssystems sieht eine bevorzugte Weiterbildung der vorliegenden Erfindung ebenfalls eine vom Stand der Technik abweichende Lösung vor. Diese ist dadurch gekennzeichnet, daß die genannten Führungsbolzen in einer auf der Trägerplatte befestigten Grundplatte starr festgelegt sind und die Linearverschiebung des Siegelkopfes relativ zur Grundplatte durch eine Verschiebung des Siegelkopfes relativ zu den Führungsbolzen erfolgt. Der Siegelkopf weist dementsprechend Bohrungen auf, in denen Kugelbüchsen vorgesehen sind, die ihrerseits auf den Führungsbolzen laufen. Das Verlegen des Unterstützungspunktes der Führungsbolzen hat im Vergleich zum Stand der Technik einen kürzeren Hebelarm zur Folge, so daß die zum Verkanten der Bolzen führenden Momente, die zu Bewegungswiderständen Anlaß geben, weitgehend reduziert werden. Zudem bewirken die Kugelbüchsen eine Leichtgängigkeit der Bewegung der Bolzen, die einen kurzen Arbeitstakt zu realisieren erlauben.In the formation of the Linerarführungssystems a preferred embodiment of the present invention also provides a deviating from the prior art solution. This is characterized in that said guide pins are fixed rigidly in a base plate fixed to the support plate and the linear displacement of the sealing head relative to the base plate is effected by a displacement of the sealing head relative to the guide pins. The sealing head accordingly has holes in which ball bushings are provided, which in turn run on the guide pins. The laying of the support point of the guide pins in comparison to the prior art result in a shorter lever arm, so that the leading to tilt the bolt moments that give rise to resistance to movement, are largely reduced. In addition, the ball bushings cause a smooth running of the Movement of the bolts that allow to realize a short stroke.
Gegenüber der Lösung nach dem Stand der Technik, bei der weicher die Führungsbolzen mit ihrem ersten Ende am Siegelkopf befestigt sind, während deren anderes Ende jeweils in einer Bohrung der Trägerplatte läuft, erzielt man durch die vorgeschlagene konstruktive Maßnahme eine wesentlich bessere Führung des Siegelkopfes. Verkantungen der Führungsbolzen in den Führungsbohrungen können bei vorliegender Vorrichtung daher a priori nicht auftreten. Die durch genannte Verkantungen bewirkte Reibung zwischen Bolzen und Bohrung mit einer undefinierten Auswirkung auf den Anpreßdruck der Siegelkontur auf die Deckfolie der Bliesterpackung ist daher von vorne herein ausgeschlossen.Compared to the solution according to the prior art, in which the softer the guide bolts are fastened with their first end to the sealing head, while the other end runs in each case in a bore of the support plate, achieved by the proposed constructive measure a much better leadership of the sealing head. Tilts of the guide pins in the guide holes can therefore not a priori occur in the present device. The caused by said tilting friction between the bolt and bore with an undefined effect on the contact pressure of the sealing contour on the cover sheet of Bliester pack is therefore excluded from the outset.
Insbesondere entfallen durch die starre Festlegung der Führungsbolzen an der Grundplatte die bei herkömmlicher Ausführungen der Linearführung vorhandenen Lateralbewegungen des Siegelkopfes, die ihre Ursache in dem Spiel zwischen der Bohrung in der Trägerplatte und dem Führungsbolzen haben, und eine exakte Ausrichtung der Siegelkontur relativ zur Ausbuchtung in der unteren Kunststoffschale verhindern.In particular, due to the rigid definition of the guide pins on the base plate existing in conventional versions of the linear guide Lateralbewegungen the sealing head, which have their cause in the game between the bore in the support plate and the guide pin, and an exact alignment of the sealing contour relative to the bulge in the prevent lower plastic shell.
Darüber hinaus bringt die Ausstattung des Siegelkopfes mit Kugelbüchsen auch eine weitgehende Elimination der Reibung zwischen Führungsbolzen und Siegelkopf bei einer Linerarverschiebung des Siegelkopfes mit sich, und vermeidet hierdurch ebenfalls undefinierte Auswirkungen auf den Anpreßdruck der Siegelkontur.In addition, the equipment of the sealing head with ball bushings also brings a substantial elimination of the friction between the guide pin and sealing head with a Linerarverschiebung the sealing head with it, and thereby also avoids undefined effects on the contact pressure of the sealing contour.
Besonderes Augenmerk bei vorliegender Vorrichtung zum Versiegeln von Bliesterpacks ist auf einen wartungsfreundlichen Aufbau ausgerichtet. Wie bereits ausgeführt sind daher wesentliche Elemente, wie die Konturplatte, die Heizplatte oder das Gummilager frei zugänglich ausgeführt, lösbar miteinander verbunden und ohne Ausbau sonstiger Elemente auszutauschen. Darüber hinaus ist gemäß einem bevorzugten Merkmal der Erfindung eine Modulbauweise vorgesehen, der zufolge
- ein Siegelkopf mit
- einer Konturplatte,
- einer Heizplatte,
- einer oder mehreren isolierplatten,
- einem Gelenkelement,
und - eine Federlagerplatte,
- zwei Führungsbolzen,
- zwei Federelemente
auf der genannten Grundplatte montiert sind und somit eine eigenständige Einheit, die Siegelposition, bilden. Desweiteren sind mehrere der genannten Siegelpositionen, z.B. vier, auf derselben Grundplatte befestigt und bilden in dieser Form eine größere Einheit, die Siegelreihe. Mehrere Siegelreihen, z.B. fünf, wiederum sind lösbar auf der Trägerplatte montiert und bilden zusammen schließlich die Grundeinheit der Vorrichtung, das Siegelpaket. Die elektrischen Leitungen werden bei dieser Ausführung über je einen vielpoligen Stecker in der Grundplatte zugeführt, der jeweils in einen komplementär ausgebildeten Stecker der Trägerplatte eingreift. Vorteilhaft ist eine eindeutige Zuordnung von Grundplatte zu Trägerplatte, damit sichergestellt ist, daß keine falsche oder seitenvertauschte Montage erfolgen kann. Somit kann der Austausch auch durch umgelernte Hilfskräfte erfolgen.
- a seal head with
- a contour plate,
- a heating plate,
- one or more insulating panels,
- a joint element,
and - a spring bearing plate,
- two guide pins,
- two spring elements
are mounted on said base plate and thus form an independent unit, the sealing position. Furthermore, several of the mentioned sealing positions, for example four, are fastened to the same base plate and form a larger unit in this form, the seal row. Several rows of seals, eg five, in turn, are detachably mounted on the support plate and together form finally the basic unit of the device, the seal package. The electrical leads are supplied in this embodiment via a multi-pin plug in the base plate, which engages in each case in a complementary formed plug of the support plate. An unambiguous assignment of the base plate to the carrier plate is advantageous so that it is ensured that no incorrect or page-exchanged installation can take place. Thus, the exchange can also be done by umemernte assistants.
Der vorgeschlagene Aufbau stellt eine einfache Austauschbarkeit der Siegelreihen und des Siegelpakets sicher. Zusammen mit den oben genannten Maßnahmen, die einen einfachen Austausch der wesentlichen Einzelelemente sicherstellen, wird hierdurch eine hohe Wartungs-, Instandhaltungs- und Anwenderfreundlichkeit erzielt. Darüber hinaus ermöglicht vorgeschlagener Aufbau auch eine einfache Messung und Einstellung der erforderlichen Temperaturen und der vom Siegelkopf auf den zu versiegelnden Pack auszuübenden Kraft. Hierzu werden eine Meßeinrichtung mit Meßaufnehmern für jede Siegelkonturplatte auf das Siegelpaket aufgesetzt, die Ist-Werte der Temperatur und der Anpreßkraft ermittelt und anschließend die Heizung und die Hebeleinstellung individuell bei jedem Siegelkopf auf die jeweiligen Sollwerte eingeregelt.The proposed design ensures easy interchangeability of the seal series and the sealed package. Together with the above-mentioned measures, which ensure a simple replacement of the essential individual elements, thereby a high maintenance, maintenance and user-friendliness is achieved. In addition, the proposed design also allows easy measurement and adjustment of the required temperatures and the force to be exerted by the sealing head on the pack to be sealed. For this purpose, a measuring device with sensors for each seal contour plate placed on the seal package, the actual values of the temperature and the contact pressure determined and then the heating and the lever adjustment Individually adjusted with each seal head to the respective setpoints.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung lassen sich dem nachfolgenden Teil der Beschreibung entnehmen. In diesem Teil wird ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung zur Versiegelung von Bliesterpacks anhand einer Zeichnung näher erläutert.
Figur 1- zeigt in schematischer Darstellung einen Schnitt durch eine Siegelposition
- FIG. 1
- shows a schematic representation of a section through a sealing position
Die Führungsbolzen 8 sind in der Grundplatte 10 starr festgelegt, wobei die Grundplatte ihrerseits lösbar auf die Trägerplatte 11 montiert ist. Bei vorliegender Ausführung sind die Federelemente 9 als Schraubenfedern ausgebildet, welche die Bolzen 8 umfassen und in dem Raum zwischen der Grundplatte 10 und Federlagerplatte 7 angeordnet sind. Wie der Figur zu entnehmen ist, weist die Federlagerplatte 7 Bohrungen 12 auf, die eine zu den Führungsbolzen 8 relative Verschiebung der Lagerplatte 7 ermöglichen. Eine Verschiebung der Lagerplatte 7 in Richtung auf die Trägerplatte 11 zu führt hierbei zu einer Verkürzung der Federn 9 und demzufolge zu einer Erhöhung der Federvorspannung.The guide pins 8 are rigidly fixed in the
Die Verschiebung der Lagerplatte 7 läßt sich durch ein einarmiges Hebelelement 6 hervorrufen, das im Punkt 13 am Siegelkopf 5 angelenkt ist. Der Hebel ist so gestaltet, daß dessen erster Hebelarm mit seinem freien Ende 14 gegen die Federlagerplatte 7 und dessen zweiter Hebelarm mit seinem freien Ende 15 gegen eine Verstellschraube drückt, deren Position in vorliegender Darstellung durch die strich-punktierte Linie 16 angedeutet ist. Die Position ist dabei so gewählt, daß die Verstellschraube von der Stirnseite 17 des Siegelkopfes 5 aus bedienbar ist.The displacement of the
Unter dem Bezugszeichen 18 sind Kugelbüchsen wiedergegeben, die in Bohrungen entsprechenden Durchmessers des Siegelkopfes 5 angeordnet sind. Sie ermöglichen nach dem Aufsetzen des Siegelkopfes auf die Deckfolie 19 des Bliesterpacks 20 eine Linearverschiebung des Siegelkopfes 5 auf den Führungsbolzen 8 in Richtung auf die Trägerplatte 11 zu. Die durch die Vorspannung der Federelemente 9 erzeugte Kraft überträgt sich hierbei auf die Konturplatte 1 und sorgt für einen gleichmäßigen Anpreßdruck an die Deckfolie 19.Under the
Neben einem exakt dosierten Anpreßdruck ist für die Qualität der Versiegelung auch eine saubere Auflage der Konturplatte 1 auf der Deckfolie 19 ausschlaggebend. Vorliegende Vorrichtung ist daher mit einem Gelenkelement 4 ausgerüstet, das aus zwei Metallplatten 20, 20' und einer zwischen den Platten eingeschlossenen Gummischicht 21 besteht. Dieses Element ermöglicht eine Verkippung der Konturplatte 1 um die zur Achse 22 der Vorrichtung senkrechten Richtungen, läßt jedoch keine Verdrehung um genannte Achse zu. Das Gummilager 4 stellt somit sicher, daß die Konturplatte 1 stets parallel zur Oberfläche der Deckfolie 19 ausgerichtet ist und dabei keine Verdrehung um die Achse 22 erfährt.In addition to a precisely metered contact pressure is for the quality of the seal and a clean circulation of the
Das Gummilager 4 nimmt den Siegelkonturträger 23 mit den eigentlichen zur Versiegelung notwendigen Elementen auf. Diese umfassen die Konturplatte 1 und die Heizplatte 2. Beide Komponenten sind als eigenständige Elemente ausgebildet und lösbar miteinander verbunden. Um den Wärmeabfluß aus diesen beiden Elementen in Richtung Gummilager 4 zu unterbinden ist zwischen Heizplatte 2 und dem Gelenkelement 4 eine thermisch isolierende Platte 3 vorgesehen.The
Im Ergebnis gewährleistet vorgeschlagene Vorrichtung eine einfache und schnelle Einstellung des Anpreßdrucks , eine hohe Siegelqualität, optimale Zugänglichkeit zu allen Bauelementen und eine geringe Stör anfälligkeit.As a result, proposed device ensures a simple and fast adjustment of the contact pressure, a high quality seal, optimal accessibility to all components and low susceptibility to interference.
Claims (16)
- Device for sealing of tray-shaped or pot-shaped receptacles such as for example blister packs or pots for storing dairy products such as yoghurt, curd cheese or coffee cream comprising- a sealing head (5)- which has a sealing contour carrier (23) and a heatable sealing contour (1,2)- a support plate (11) comprising- at least one guiding bolt (8),- which allow a linear displacement of the sealing head (5) relative to the support plate (11)- at least one spring element (9),- which impinges on the sealing head (5) and the support plate (11) with a force directed away from the support plate- a spring seat plate (7)- which is arranged between the sealing head (5) and support plate (11)- and can be displaced linearly in the same direction as the sealing head (5)- and, at that end of the spring element (9) which faces the spring element (9), bears against the sealing head (5)- and a joint element (4), which is assigned to the sealing head (5) and- permits tilting of the sealing contour carrier (23) perpendicular to the axis of the aforementioned guiding bolts
characterised in that- the at least one guiding bolt (8) is fixed directly or indirectly on the support plate (11), and in that- the joint element is designed as a rubber bearing (4)- comprising two metal plates (20, 20') and an interposed rubber layer (21)- the plates (20, 20') being vulcanized or bonded on. - Device according to claim 1, characterised in that- each metal plate (20, 20") has, on the side which faces away from the rubber layer (21), a bolt that is concentric to the axis of the rubber bearing, and- comprises a slot with a dovetail flank- engages in a bore of the same diameter in the sealing head (5) or sealing contour carrier (23)- and can be fixed by means of at least one screw, which can be screwed against the aforementioned flank and is provided in the sealing head (5) or sealing contour carrier (23).
- Device according to claim 1 or 2, characterised in that- each of the metal plates (20, 20") has a bore outside the axis of the rubber bearing- in which a cylindrical centering pin fixed on the sealing head (5) or sealing contour carrier (23) engages.
- Device according to one of the preceding claims, characterised in that- an adjustment element (6) is provided between the spring seat plate (7) and the sealing head (5),- by means of which the distance of the spring seat plate (7) to the support plate (11) can be varied.
- Device according to claim 4, characterised in that- the said adjusting element comprises a one armed lever handle (6)- which is articulately mounted on the sealing head (5) or the spring seat plate (7)- whose one lever arm pushes with its free end (14) against the spring seat plate (7) or the sealing head (5)- and whose other lever arm pushes with its free end (15) against an adjusting screw (16)- the adjusting screw (16) being preferably accessible from that face side (17) of the sealing head which is directed away from the support plate (11).
- Device according to claim 5, characterised in that- the articulation point (13) of the lever (6) is arranged in an edge region of the sealing head (5)- and the adjusting screw (16) is arranged in the opposite edge region of the sealing head (5)- and the free end (14) of one lever arm is located in the area of the axis of the sealing head (5).
- Device according to claim 5 or 6, characterised in that- the adjusting screw (16) comprises a cylindrical pin which is displaceable in the direction of its axis and a headless screw with hexagon socket head,- the cylindrical pin being arranged between the aforementioned lever and the aforementioned headless screw- and the headless screw being fixable in its head area by means of a lock nut.
- Device according to one of the preceding claims,
characterised in that- the heatable sealing contour is built up of an independent contour plate (1) and an independent heating plate (2)- and the two plates (1,2)- are detachably connected to one another- and detachably connected to the sealing contour carrier (23) - Device according to claim 8, characterised in that- the heating plate (2) is formed as- a flat heating plate- or a heating plate with heating cartridge.
- Device due to the claims 8 or 9, characterised in that- at least one thermal insulating layer (3) is provided between the heating plate (2) and joint element (4).
- Device according to claims 8 to 10, characterised in that- the contour plate (1) is made of hardened material.
- Device according to claims 8 to 11, characterised in that- the contour plate (1) is made of a material that is resistant to aggressive substances- preferably of stainless steel.
- Device according to one of claims 1 to 12, characterised in that- the guiding bolt/ bolts (8) is/ are rigid fixed to a base plate (10)- and the linear displacement of the sealing head (5) relative to the base plate (10) is performed by means of a displacement of the sealing head relative to the guiding bolt/ bolts (8)- and the sealing head (5) is equipped with ball bearings (18)- which run on the guiding bolt/ bolts (8)
- Device according to claim 13, characterised in that- a sealing head (5) with- a contour plate (1),- a heating plate (2),- one or more insulating plates (3),- a joint element (4)
and- a spring seat plate (7),- two guiding bolts (8),- two spring elements (9)
are mounted on the base plate (10) and form an independent unit. - Device according to claim 14, characterised in that- a plurality of the aforementioned units, for example four, are fixed on the same base plate (10),- and in that usually a plurality of base plates, for example five, are detachably mounted on the support plate (11),- the base plates (10) each having a multipoled electrical plug- which in each case engages in an electrical plug of complementary design of the support plate (11).
- Device according to claim 14 or 15, characterised in that the base plate/plates (10) can only be mounted on the carrier plate (11) in an unambiguous configuration.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10222619 | 2002-05-17 | ||
DE10222619A DE10222619A1 (en) | 2002-05-17 | 2002-05-17 | Machine for sealing e.g. tubs of dairy product has sealing head mounted on bolts biased towards head by springs under bearing plate, tilting adjuster plate allowing distance between plate and head to be varied |
PCT/DE2003/001589 WO2003097460A1 (en) | 2002-05-17 | 2003-05-16 | Device for sealing tray-shaped or pot-shaped receptacles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1507707A1 EP1507707A1 (en) | 2005-02-23 |
EP1507707B1 true EP1507707B1 (en) | 2008-07-02 |
Family
ID=29285639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03752703A Expired - Lifetime EP1507707B1 (en) | 2002-05-17 | 2003-05-16 | Device for sealing tray-shaped or pot-shaped receptacles |
Country Status (8)
Country | Link |
---|---|
US (1) | US7735298B2 (en) |
EP (1) | EP1507707B1 (en) |
AT (1) | ATE399713T1 (en) |
AU (1) | AU2003232626A1 (en) |
CA (1) | CA2500504C (en) |
DE (2) | DE10222619A1 (en) |
ES (1) | ES2310668T3 (en) |
WO (1) | WO2003097460A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201016930D0 (en) * | 2010-10-07 | 2010-11-24 | Ishida Europ Ltd | Lifting apparatus |
US10343797B2 (en) | 2015-03-12 | 2019-07-09 | Owens-Brockway Glass Container Inc. | Sealing foil liners to containers |
CN106043829B (en) * | 2016-07-27 | 2017-09-26 | 东莞恩茁智能科技有限公司 | Heat sealing device and the packaging machine using the heat sealing device |
HUE062141T2 (en) | 2016-12-08 | 2023-09-28 | Alcon Inc | Apparatus for sealing an ophthalmic lens package |
WO2021187293A1 (en) * | 2020-03-16 | 2021-09-23 | 株式会社ヤクルト本社 | Heat-sealing device |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1036422A (en) * | 1961-10-05 | 1966-07-20 | Fords Ltd | Improvements in or relating to devices for sealing a cap to a container |
CH444013A (en) * | 1966-03-18 | 1967-09-15 | Alupak Ag | Method and device for the tight sealing of filled vessels |
CH472315A (en) * | 1968-05-08 | 1969-05-15 | Hamac Hansella Ges Mit Beschra | Method and device for closing packaging containers |
CH652729A5 (en) * | 1982-04-28 | 1985-11-29 | Ciba Geigy Ag | LIGHT CROSSLINKABLE POLYMERS WITH SIDE-SIDED THIOAETHERIMIDYL GROUPS. |
DE3413766A1 (en) * | 1984-04-12 | 1985-10-24 | Lieder Maschinenbau GmbH & Co KG, 3033 Schwarmstedt | Sealing device |
US4736568A (en) * | 1986-09-29 | 1988-04-12 | Rutherford Research, Inc. | Machine for sealing cups |
DE3715356A1 (en) * | 1987-05-08 | 1988-12-01 | Benz & Hilgers Gmbh | DEVICE FOR SEALING COVER FILMS ON PACKAGING CONTAINERS, IN PARTICULAR PLASTIC CUP |
US5123227A (en) * | 1988-04-21 | 1992-06-23 | Snow Brand Milk Products Co., Ltd. | Positioning and press-sealing means |
JP2578179Y2 (en) * | 1992-03-06 | 1998-08-06 | 四国化工機株式会社 | Container sealing device |
JP2568423Y2 (en) * | 1992-03-06 | 1998-04-15 | 四国化工機株式会社 | Container sealing device |
US5306383A (en) * | 1992-10-30 | 1994-04-26 | Signode Corporation | Method and apparatus for producing a welded joint in thermoplastic strap with differential pressure |
DE19629356A1 (en) * | 1996-07-20 | 1998-01-22 | Willi Stenzel | Hot sealing device to seal container apertures with foil cutouts |
EP0855264A1 (en) * | 1997-01-27 | 1998-07-29 | Novartis AG | Process and apparatus for heat sealing a basis part of a packaging means with a coverfoil and a process and apparatus for packaging contact lenses |
US6637491B2 (en) * | 2001-09-07 | 2003-10-28 | Creative Foods, Llc | Sealing head for lidding machine |
-
2002
- 2002-05-17 DE DE10222619A patent/DE10222619A1/en not_active Withdrawn
-
2003
- 2003-05-16 WO PCT/DE2003/001589 patent/WO2003097460A1/en active IP Right Grant
- 2003-05-16 CA CA2500504A patent/CA2500504C/en not_active Expired - Fee Related
- 2003-05-16 EP EP03752703A patent/EP1507707B1/en not_active Expired - Lifetime
- 2003-05-16 DE DE50310072T patent/DE50310072D1/en not_active Expired - Lifetime
- 2003-05-16 AT AT03752703T patent/ATE399713T1/en active
- 2003-05-16 ES ES03752703T patent/ES2310668T3/en not_active Expired - Lifetime
- 2003-05-16 US US10/514,540 patent/US7735298B2/en not_active Expired - Fee Related
- 2003-05-16 AU AU2003232626A patent/AU2003232626A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
ES2310668T3 (en) | 2009-01-16 |
EP1507707A1 (en) | 2005-02-23 |
US20050252171A1 (en) | 2005-11-17 |
WO2003097460A1 (en) | 2003-11-27 |
US7735298B2 (en) | 2010-06-15 |
DE50310072D1 (en) | 2008-08-14 |
CA2500504C (en) | 2010-09-07 |
AU2003232626A1 (en) | 2003-12-02 |
ATE399713T1 (en) | 2008-07-15 |
DE10222619A1 (en) | 2003-11-27 |
CA2500504A1 (en) | 2003-11-27 |
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