DE4315631A1 - Process and apparatus for welding a port into a plastic bag or the like - Google Patents
Process and apparatus for welding a port into a plastic bag or the likeInfo
- Publication number
- DE4315631A1 DE4315631A1 DE19934315631 DE4315631A DE4315631A1 DE 4315631 A1 DE4315631 A1 DE 4315631A1 DE 19934315631 DE19934315631 DE 19934315631 DE 4315631 A DE4315631 A DE 4315631A DE 4315631 A1 DE4315631 A1 DE 4315631A1
- Authority
- DE
- Germany
- Prior art keywords
- port
- welding
- foils
- air
- weld
- Prior art date
- 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.)
- Withdrawn
Links
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/05—Containers specially adapted for medical or pharmaceutical purposes for collecting, storing or administering blood, plasma or medical fluids ; Infusion or perfusion containers
- A61J1/10—Bag-type containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/03—After-treatments in the joint area
- B29C66/034—Thermal after-treatments
- B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
- B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
- B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
- B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
- B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
- B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
- B29C66/53261—Enclosing tubular articles between substantially flat elements
- B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
- B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
- B29C33/14—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall
- B29C33/16—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall using magnetic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7148—Blood bags, medical bags
Abstract
Description
Die Erfindung betrifft ein Verfahren so wie eine Schweißvorrichtung zum Ein schweißen eines Ports in einen Kunst stoffbeutel o. dgl.. Der Begriff Port umfaßt dabei Öffnungsstutzen zum Be füllen und/oder Entleeren eines Kunst stoffbeutels, wobei sowohl die Beutel form als auch die Formgestaltung des in sich steif und tragfähig ausgebildeten Ports variieren kann.The invention relates to a method like this like a welding device for on welding a port into an art tote bag or the like. The term port includes opening sockets for loading fill and / or empty an art Stoffbeutels, both the bags form as well as the design of the in itself stiff and load-bearing ports can vary.
Derartige Kunststoffbeutel mit einem Port werden insbesondere für medizinische und pharmazeutische Zwecke benötigt, sind aber auch im chemischen Bereich verstärkt im Einsatz. In allen Fällen kommt es darauf an, daß der Port vollständig dicht und auch auf Zug belastbar in den Kunststoffbeutel o. dgl. eingeschweißt wird, da der Port neben seinen Befüll- und/oder Entleerungsfunktionen auch als Tragvorrichtung für den Beutel selbst oder für an den Port montierte Geräte dient.Such a plastic bag with a port are used especially for medical and pharmaceutical purposes are needed, however also in the chemical sector increasingly Commitment. In all cases, it depends that the port is completely tight and also on Load resilient in the plastic bag or the like. is welded in because the port is next to its Filling and / or emptying functions too as a carrying device for the bag itself or for devices mounted on the port.
Das Einschweißen des Ports kann vor, während oder im Anschluß an die Herstellung des eigent lichen Kunststoffbeutels erfolgen. Der Port ist immer zwischen zwei einander gegenüberliegenden Folien positioniert, die die Wandungen des Kunststoffbeutels bilden. Die Folien werden mit dem Stutzen des Ports verschweißt. Dement sprechend müssen der einzuschweißende Stutzen des Ports und die Kunststoffolien aus mit einander zu verschweißenden Materialen be stehen. Zum Herstellen der Schweißnähte wird üblicherweise eine geteilte Schweißform be nutzt, die einander gegenüberliegende Andruck flächen besitzt, die die Folien an den einzu schweißenden Stutzen des Ports andrücken. The port can be welded in before or after the production of the actual Lichen plastic bag done. The port is always between two opposite one another Positioned foils that the walls of the Form plastic bag. The slides come with welded to the port socket. Dement speaking the spigot to be welded of the port and the plastic films from with materials to be welded together stand. To make the welds usually be a split weld shape uses the opposing pressure has surfaces that the films on the one Press on the welding socket of the port.
Es sind Schweißverfahren und Schweißformen bekannt, die mittels Hochfrequenz arbeiten. Das Hochfrequenzschweißen erfordert jedoch ein polares Material und scheidet deshalb in dem vorliegenden Fall aus, da die Kunst stoffbeutel für die vorgenannten Einsatzzwecke in der Regel aus Polyethylen oder Polypropylen bestehen.They are welding processes and welding forms known to work by means of radio frequency. However, high frequency welding requires a polar material and therefore falls into the present case because art cloth bags for the aforementioned purposes usually made of polyethylene or polypropylene consist.
Auch die bekannte Ultraschallschweißung ist nicht anwendbar, da dabei Partikel freige setzt werden, die dem fertigen Kunststoff beutel anhaften könnten, was für den medizinischen und pharmazeutischen Verwendungszweck nicht sein darf.The well-known ultrasonic welding is also not applicable, as this releases particles be put to the finished plastic bags could adhere to the medical and pharmaceutical use may.
Es verbleiben somit nur Wärmeschweißverfahren, bei denen die Schweißformen entweder ständig oder kurzzeitig beschränkt auf den Schweiß vorgang beheizt werden. In beiden Fällen läßt sich nicht vermeiden, daß bei der Serienfertigung solcher Kunststoffbeutel mit eingeschweißten Ports die Schweißformen beachtliche Temperaturen annehmen, die nahe an der Schmelztemperatur der thermoplastischen Materialien der Folien und des einzuschweißenden Ports liegen.This leaves only heat welding processes where the welding forms either constantly or temporarily limited to sweat process are heated. In both cases leaves do not avoid that in series production such plastic bag with welded Ports the welding forms considerable temperatures assume that close to the melting temperature of the thermoplastic materials of the foils and the port to be welded.
Die hohen Werkzeugtemperaturen haben den ent scheidenden Nachteil, daß bereits beim Schließen der Schweißform, d. h. beim Andrücken der Folien an den Stutzen des Ports die Folien erweichen, sich dehnen oder sonstwie beschädigt werden, so daß eine einfandfrei dichte und trag fähige Schweißnaht nicht gewährleistet ist.The high tool temperatures have the ent outgoing disadvantage that already when closing the welding form, d. H. when pressing the foils soften the foils on the ports of the port, stretch or get damaged in any way, so that a flawlessly tight and stable capable weld is not guaranteed.
Will man andererseits die Temperatur der Schweißformen niedrig halten, dann sind Ab kühlzeiten bei geschlossener Schweißform notwendig, die bei der Serienfertigung äußerst nachteilig sind. Selbst wenn die Schweißform mittels Kühlvorrichtungen be schleunigt gekühlt wird, ergeben sich wegen der Materialmasse der Schweißform längere Stillstandszeiten bei der Serienfertigung, bis die hinreichend gekühlte Schweißnaht aus der dann geöffneten Schweißform ent nommen werden kann.On the other hand, if you want the temperature of the Keep welding forms low, then Ab cooling times with closed welding form necessary in series production are extremely disadvantageous. Even if that Welding form by means of cooling devices accelerated cooling, arise because of the material mass of the welding form longer Downtimes in series production, until the weld is sufficiently cooled from the then opened welding form can be taken.
Aufgabe der Erfindung ist es daher, ein neues Verfahren und eine Schweißform dafür zu entwickeln, das sich für die Serienein schweißung von Ports in Kunststoffbeuteln besonders eignet und eine hohe Fertigungs leistung ermöglicht, ohne daß dies die Qualität der Schweißnaht beeinträchtigt.The object of the invention is therefore a new process and a welding form for it to develop that is for series production welding of ports in plastic bags particularly suitable and high manufacturing performance enables without this The quality of the weld seam is impaired.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß in die Andruckflächen der Schweiß form entsprechend dem Verlauf und der Breite der herzustellenden Schweißnähte Luftkanäle eingeformt sind, die zur Schweißnaht hin offen sind derart, daß ihre offenen Seiten nach dem Schließen der Form durch die an den Stutzen des Ports anzuschweißenden Folien be grenzt sind, wobei nach dem Schließen der Form die Schweißnähte durch Heißluft herge stellt werden, die zu diesem Zweck durch die Luftkanäle hindurchgeleitet wird, und daß sodann im Anschluß daran bei noch geschlossener Form die fertigen Schweißnähte mittels Kalt luft gekühlt werden, die zu diesem Zweck an stelle der Heißluft durch dieselben Luftkanäle hindurchgeleitet wird.This object is achieved according to the invention solved that in the pressure surfaces of sweat shape according to the course and width of the weld seams to be made are molded in, towards the weld are open in such a way that their open sides after closing the mold by the to the Port of the port to be welded foils are bordered, after closing the Shape the weld seams using hot air are provided for this purpose by the Air channels is passed through, and that then followed by a closed one Shape the finished welds using cold air cooled for this purpose place the hot air through the same air ducts is passed through.
Als ein besonderes Merkmal kann die Schweiß form so ausgebildet sein, daß die Luftkanäle nur gegen den einzuschweißenden Stutzen des Ports offen sind, und daß die sich in der Teilungsebene der Form von dem Stutzen hin wegerstreckenden Andruckflächen vollflächig ausgeführt sind und bis an den Stutzen heran reichen.Sweat can be a special feature be designed so that the air channels only against the socket to be welded in Ports are open, and that is in the Partition plane of the shape from the nozzle stretching pressure surfaces all over are executed and up to the nozzle pass.
Das erfindungsgemäße Verfahren und die neue Schweißform ermöglichen eine Serienfertigung mit hoher Ausstoßleistung beim Einschweißen eines Ports zwischen zwei einander gegenüber liegenden Folien des Kunststoffbeutels o. dgl. Wesentlich ist dabei, daß die Schweißform trotz der hohen Fertigungsleistung ausreichend kühl bleibt. Erreicht wird dies dadurch, daß für die Wärmeschweißung das Medium Luft be nutzt wird, die als Heißluft nur und unmittel bar an der zu bildenden Schweißnaht entlang strömt. Das gilt auch dann, wenn in die Schweiß form zwischen den offenen Seiten der Luft kanäle und den zu verschweißenden Folien eine hitze- und kältebeständige dünne Schutz schicht eingelegt wird, um die zu verschweißenden Folien des Kunststoffbeutels so weit als möglich mechanisch zu schonen. Immer befindet sich die durch die Luftkanäle hindurchgeleitete Luft in einem unmittelbaren Kontakt zu der herzu stellenden Schweißnaht.The method according to the invention and the new one Welding form enable series production with high output during welding of a port between two facing each other lying films of the plastic bag or the like It is essential that the welding form sufficient despite the high production output stays cool. This is achieved by the fact that the medium air for heat welding is used as hot air only and immediately bar along the weld seam to be formed flows. This also applies when in the sweat shape between the open sides of the air channels and the foils to be welded a heat and cold resistant thin protection layer is inserted in order to be welded Foil the plastic bag as much as possible to protect mechanically. It is always there air conducted through the air ducts in direct contact with her spot weld.
Luft als Trägermedium für das Heranführen und das Abführen von Wärme an die herzustellende Schweißnaht hat den großen Vorteil, daß sie nahezu trägheitslos zwischen Heißluft und Kalt luft wechseln kann und auch punktgenau auf die jeweilige Schmelztemperatur der zu verschweißenden Materialien eingestellt werden kann. Durch diesen schnellen Wechsel zwischen Heißluft und Kaltluft wird verhindert, daß sich das unmittelbar mit der empfindlichen Folie in Kontakt stehende Material der Schweißform nennenswert aufheizen kann. Zudem kann die niedrige Temperatur der Schweißform insgesamt noch dadurch gefördert werden, daß die Schweißform Kühlvorrichtungen aufweist, wie dies dem Fachmann bekannt ist.Air as a carrier medium for the introduction and dissipating heat to the one to be produced Weld seam has the great advantage that it almost inertia between hot air and cold air can change and also precisely on the respective melting temperature of the welded Materials can be adjusted. Through this quick change between hot air and cold air is prevented that the immediately with the sensitive film in contact Heat up the material of the welding form significantly can. In addition, the low temperature of the This encourages welding form overall that the welding form cooling devices has, as is known to those skilled in the art.
Die auf diese Weise trotz hoher Fertigungs leistungen immer niedrig gehaltene Temperatur der neben der herzustellenden Schweißnaht liegenden Kontakt- bzw. Andruckflächen der Schweißform und der Vorteil, daß die empfindlichen Folien entlang der Schweißnaht wegen der zur Schweißnaht offenen Luftkanäle im Prinzip keinem mechanischen Druck ausgesetzt sind, gewährleisten, daß die Folien nicht schon beim Schließen der Form ange schmolzen, überdehnt oder sonstwie mechanisch überbeansprucht werden, und zwar auch dann nicht, wenn sie mittels stark geformter An druckflächen an den einzuschweißenden Stutzen eines Ports angedrückt und dabei zum Teil bis zu 90° abgewinkelt werden müssen. Dort sind die kritischen Stellen beim Einschweißen eines Ports zwischen zwei einander gegenüberliegenden Folien eines Kunststoffbeutels. Ist die Schweiß form an ihren Andruckflächen beim Schließen der Form noch zu warm, dann treten zwangsläufig an diesen kritischen Stellen Beschädigungen der empfindlichen Folien auf und es können keine ausreichend dichten und tragfähigen Schweißnähte erzeugt werden.That way despite high manufacturing performance always kept low temperature next to the weld to be made Contact or pressure surfaces of the welding form and the advantage that the sensitive foils along the weld because of the open to the weld Air channels in principle no mechanical pressure exposed, ensure that the foils not started when the mold is closed melted, overstretched or otherwise mechanically be overused, even then not if it is by means of a strongly shaped An pressure areas on the welded socket of a port pressed and partially up to must be angled to 90 °. There are the critical points when welding a Ports between two opposite one another Foils of a plastic bag. Is the sweat shape on their pressure surfaces when closing the Shape still too warm, then inevitably kick damage at these critical points sensitive foils on it and none sufficiently tight and stable welds be generated.
Eine besonders vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens sieht vor, daß die durch die Luftkanäle strömende Heißluft und/oder Kaltluft mit Druck beaufschlagt ist. Durch einen entsprechend hohen Druck in den Luftkanälen, die bei geschlossener Form den Verlauf und die Breite der Schweißnähte be stimmen, werden die zu verschweißenden Folien entlang der Schweißnaht gut an den einzu schweißenden Stutzen des Ports oder anein ander (bei normalen Schweißnähten zwischen zwei Folien) gedrückt, so daß eine blasen freie, d. h. ohne Lufteinschlüsse ausgebildete Schweißnaht gewährleistet ist. A particularly advantageous embodiment of the The method according to the invention provides that the hot air flowing through the air ducts and / or cold air is pressurized. By a correspondingly high pressure in the Air ducts that when closed form the Course and width of the welds be are correct, the foils to be welded well along the weld seam welding nozzle of the port or on other (for normal welds between two foils) pressed so that one blow free, d. H. trained without air pockets Weld is guaranteed.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher be schrieben. Es zeigen:An embodiment of the Invention with reference to the drawings wrote. Show it:
Fig. 1 in perspektivischer Darstellung einen Kunststoffbeutel mit ein geschweißtem Port, Fig. 1 is a perspective view of a plastic bag with a welded port,
Fig. 2 + 3 in schematischer Darstellung eine erfindungsgemäße Schweißform im geöffneten und geschlossenen Zu stand, Fig. 2 + 3 a schematic representation of a welded form of the invention in the opened and closed to stand,
Fig. 4 einen Querschnitt durch die ge schlossene Schweißform gemäß Fig. 4 shows a cross section through the closed welding shape according to
Fig. 3 entlang der Linie IV-IV. Fig. 3 along the line IV-IV.
Der in Fig. dargestellte Kunststoffbeutel ist aus einer Schlauchfolie gefertigt. Er besitzt eine untere doppelte Schweißnaht 5 mit einer Aufhängeöse 6, wie dies bei medizinischen Beuteln bekannt ist. Am anderen Ende der Schlauch folie ist zwischen den einander gegenüberliegenden Folien 7 und 8 (vergl. Fig. 4) der Stutzen 9 eines Ports 10 eingeschweißt, und zwar mittels nur einer Schweißnaht 11, die um den Stutzen des Ports herumgeführt ist und die nahtlos in die doppelten Schweißnähte 12 am oberen Ende des Kunststoffbeutels übergeht. Statt der nur einen Schweißnaht 11 können natürlich auch mehrere parallele Schweißnähte am Stutzen des Ports hergestellt werden. The plastic bag shown in Fig. Is made of a tubular film. It has a lower double weld seam 5 with a hanging eye 6 , as is known for medical bags. At the other end of the tubular film is welded between the opposing foils 7 and 8 (see FIG. 4) of the nozzle 9 of a port 10 , by means of only one weld seam 11 which is guided around the nozzle of the port and which is seamless in the double welds 12 at the upper end of the plastic bag passes over. Instead of only one weld seam 11 , it is of course also possible to produce a plurality of parallel weld seams at the port of the port.
Die für dieses Ausführungsbeispiel benutzte erfindungsgemäße Schweißform ist zweigeteilt und besitzt zwei formgleiche Hälften 13 und 14 mit ihren jeweiligen Andruckflächen 15 und 16.The welding mold according to the invention used for this exemplary embodiment is divided into two and has two halves 13 and 14 of identical shape with their respective pressure surfaces 15 and 16 .
Die Schweißform dient dazu, die beiden Folien 7 und 8 an den Stutzen 9 des Ports 10 anzu schweißen, wobei in der Teilungsebene der Form, in der die beiden Andruckflächen 15 und 16 plan aneinanderliegen, keine Schweißnaht herge stellt werden soll. Diese sogenannte normale Schweißnaht zwischen den beiden plan aneinander liegenden Folien wird erst später mit einem anderen Schweißform-Werkzeug fertiggestellt, nachdem vorher die Verschweißung der Folien mit dem Stutzen des Ports hergestellt worden ist, wie dies insbesondere Fig. 3 zeigt.The welding form is used to weld the two foils 7 and 8 to the connecting piece 9 of the port 10 , with no weld seam to be produced in the parting plane of the form in which the two pressure surfaces 15 and 16 lie flat against one another. This so-called normal weld seam between the two flat foils lying against one another is only completed later with another welding form tool after the foils have been welded to the port of the port beforehand, as shown in particular in FIG. 3.
Fig. 3 mit Fig. 4 zeigt die geschlossene Schweißform mit dem Verlauf der Schweißnaht am Stutzen 9 des Ports 10, der bei dem darge stellten Ausführungsbeispiel kreisrund ausge führt ist, jedoch auch in jeder anderen ge wünschten Querschnittsform und/oder Gestaltung ausführbar ist. Der Verlauf und die Breite der herzustellenden Schweißnaht ist durch die Luftkanäle 17 und 18 bestimmt, die konzentrisch um den kreisförmigen Stutzen 9 des Ports herum geführt sind und die zur Schweißnaht hin offen sind derart, daß ihre offenen Seiten bei ge schlossener Form durch die an den Stutzen des Ports anzuschweißenden Folien 7 und 8 begrenzt sind. Fig. 3 with Fig. 4 shows the closed welding shape with the course of the weld on the nozzle 9 of the port 10 , which leads out in the embodiment presented Darge is circular, but can also be carried out in any other desired cross-sectional shape and / or design. The course and width of the weld to be produced is determined by the air channels 17 and 18 , which are guided concentrically around the circular connecting piece 9 of the port and which are open to the weld seam in such a way that their open sides in the closed form by the at the The port of the port to be welded foils 7 and 8 are limited.
Durch diese kreisringförmigen Luftkanäle 17 und 18 wird bei geschlossener Form zunächst Heißluft hindurchgeleitet, und zwar über die Zuleitungen 19 und 20 und die Ableitungen 21 und 22. Zu diesem Zweck ist ein Gebläse 23 mit nachgeschaltetem Lufterhitzer 24 vorge sehen, der mittels des Umschaltventils 25 auf die Zuleitungen 19 und 20 geschaltet ist. Die Abluft gelangt über die Ableitungen 21 und 22 und das Ventil 26 in einen Wärmerück gewinnungskreislauf o. dgl..When the mold is closed, hot air is first passed through these annular air channels 17 and 18 , specifically via the supply lines 19 and 20 and the discharge lines 21 and 22 . For this purpose, a fan 23 with downstream air heater 24 is easily seen, which is switched by means of the switching valve 25 to the feed lines 19 and 20 . The exhaust air passes through the discharge lines 21 and 22 and the valve 26 into a heat recovery circuit or the like.
Soll gemäß einer vorteilhaften Form der Erfindung in den Luftkanälen 17 und 18 ein Überdruck auf gebaut werden, dann ist es zweckmäßig, das Ventil 26 als Drosselventil auszubilden, das für den Aufbau des Überdrucks in den Luft kanälen 17 und 18 entsprechend gedrosselt werden kann.If, according to an advantageous form of the invention, an overpressure is built on in the air channels 17 and 18 , then it is expedient to design the valve 26 as a throttle valve, which can be throttled accordingly for the build-up of the excess pressure in the air channels 17 and 18 .
Ist infolge der durch die Luftkanäle hindurch strömenden Heißluft die Verschmelzung der beiden Folien mit dem Material des Stutzens des Ports erfolgt, d. h. die Schweißnaht hergestellt, dann schaltet das Ventil 25 die weitere Zufuhr von Heißluft ab und über das Ventil 27 wird Kalt luft in die Zuleitungen 19 und 20 eingegeben. Die Schweißnähte werden dadurch sehr schnell auf einen Zustand heruntergekühlt, in dem sie eine ausreichende Materialfestigkeit haben, um sofort der geöffneten Form entnommen zu werden. If, as a result of the hot air flowing through the air ducts, the fusion of the two foils with the material of the port socket takes place, ie the weld seam is produced, then the valve 25 switches off the further supply of hot air and cold air is fed into the feed lines via the valve 27 19 and 20 entered. As a result, the weld seams are cooled down very quickly to a state in which they have sufficient material strength to be immediately removed from the opened mold.
Erkennbar ist aus der Darstellung gemäß Fig. 3, daß die kritischen Zonen der Schweißnahther stellung in der Teilungsebene der Schweißform direkt am Umfang des kreisförmigen Stutzens des Ports liegen, an denen die anzuschweißenden Folien um nahezu 90° abgewinkelt sind. An diesen Stellen unterliegen die Folien beim Schließen der Form (vergl. hierzu Fig. 2) der größten Beanspruchung und müssen punktgenau sowohl an dem Stutzen des Ports als auch aneinander ge drückt werden, damit an dieser Stelle die ge forderte hohe Dichtigkeit gewährleistet ist.It can be seen from the illustration according to FIG. 3 that the critical zones of the weld position in the parting plane of the weld shape lie directly on the circumference of the circular connection piece of the port, on which the foils to be welded are angled by almost 90 °. At these points, the foils are subject to the greatest stress when the mold is closed (cf. FIG. 2) and must be pressed precisely on both the connecting piece of the port and against one another so that the required high level of tightness is ensured at this point.
Erreicht wird dies bei der dargestellten er findungsgemäßen Schweißform dadurch, daß die Luftkanäle 17 und 18 nur gegen den einzu schweißenden Stutzen 9 des Ports 10 offen sind, und daß die sich in der Teilungsebene der Form von dem Stutzen hinwegerstreckenden Andruck flächen 15 und 16 vollflächig, d. h. ohne offene Luftkanäle ausgeführt sind und bis an den Stutzen heranreichen.This is achieved in the illustrated welding mold according to the invention in that the air channels 17 and 18 are only open against the socket 9 of the port 10 to be welded in, and that the pressure areas 15 and 16 extending over the entire surface in the parting plane of the form of the socket, That is, they are designed without open air channels and reach up to the nozzle.
Soll bei einer anderen (nicht dargestellten) Ausführungsform eines erfindungsgemäßen Schweiß werkzeugs der gleiche punktgenaue Andruck der Folien in den genannten kritischen Zonen er reicht werden, obwohl zum Herstellen einer von dem Stutzen 9 des Ports hinwegführenden Schweiß naht auch in den in der Teilungsebene liegenden Andruckflächen 15 und 16 offene Luftkanäle vor handen sind, dann ist vorzusehen, daß die Luft kanäle an diesen kritischen Stellen von Querstreben überbrückt werden, die achs parallel zum Stutzen und eng an dem Stutzen des Ports 10 anliegen, so daß die Folien in der gewünschten Weise punktgenau sowohl an den Stutzen des Ports als auch aneinander ge drückt werden.In another (not shown) embodiment of a welding tool according to the invention, the same pinpoint pressure of the foils in the above-mentioned critical zones is sufficient, although in order to produce a sweat leading away from the nozzle 9 of the port, the pressure surfaces 15 lying in the parting plane also approach and 16 open air ducts are present, then it should be provided that the air ducts are bridged at these critical points by cross struts, which are parallel to the neck and close to the neck of the port 10 , so that the films in the desired manner both precisely be pressed against the port of the port and against each other.
Claims (6)
- - wobei die Folien zum Herstellen der Schweiß nähte mittels einander gegenüberliegender Andruckflächen einer geteilten Schweißform an den einzuschweißenden Stutzen des Ports angedrückt werden,
- the foils for producing the weld seams are pressed against the connecting piece of the port to be welded in by means of opposing pressure surfaces of a divided weld shape,
- - daß in die Andruckflächen der Schweißform entsprechend dem Verlauf und der Breite der herzustellenden Schweißnähte Luftkanäle ein geformt sind, die zur Schweißnaht hin offen sind derart, daß ihre offenen Seiten nach dem Schließen der Form durch die an den Stutzen anzuschweißenden Folien begrenzt sind,- That in the pressure surfaces of the welding form according to the course and width of the to produce weld seams air ducts are shaped that are open to the weld are such that their open sides after the Closing the form by connecting to the nozzle foils to be welded are limited,
- - daß sodann die Schweißnähte durch Heißluft hergestellt werden, die zu diesem Zweck durch die Luftkanäle hindurchgeleitet wird,- That then the welds by hot air are produced for this purpose by the air ducts are passed through
- - und daß im Anschluß daran bei noch geschlossener Form die fertigen Schweißnähte mittels Kalt luft gekühlt werden, die zu diesem Zweck an stelle der Heißluft durch die Luftkanäle hin durchgeleitet wird.- And that afterwards with the still closed Shape the finished welds using cold air cooled for this purpose place the hot air through the air ducts is passed through.
dadurch gekennzeichnet,
- - daß die durch die Luftkanäle strömende Heiß luft und/oder Kaltluft mit Druck beaufschlagt ist.
characterized,
- - That the hot air flowing through the air channels and / or cold air is pressurized.
- - mit mindestens zwei einander gegenüberliegenden Andruckflächen, die zum Herstellen der Schweiß nähte die Folien an den einzuschweißenden Stutzen des Ports andrücken,
- - With at least two opposing pressure surfaces, which press the foils to produce the weld to the welded socket of the port,
- - daß in die Andruckflächen (15, 16) der Schweiß form entsprechend dem Verlauf und der Breite der herzustellenden Schweißnähte Luftkanäle (17, 18) eingeformt sind, die zur Schweißnaht hin offen sind derart, daß ihre offenen Seiten nach dem Schließen der Form durch die an den Stutzen (9) des Ports (10) anzuschweißenden Folien (7, 8) begrenzt sind.
- - That in the pressure surfaces ( 15 , 16 ) of the welding form air channels ( 17 , 18 ) are formed in accordance with the course and width of the weld seams to be produced, which are open to the weld seam in such a way that their open sides after closing the mold by the foils ( 7 , 8 ) to be welded to the connecting piece ( 9 ) of the port ( 10 ) are limited.
- - daß die Luftkanäle (17, 18) nur gegen den ein zuschweißenden Stutzen (9) des Ports (10) offen sind,
- - und daß die sich in der Teilungsebene der Form von dem Stutzen hinwegerstreckenden Andruckflächen (15 und 16) vollflächig aus geführt sind und bis an den Stutzen heran reichen.
- - That the air channels ( 17 , 18 ) are only open against the welded-on socket ( 9 ) of the port ( 10 ),
- - And that extending in the parting plane of the shape of the nozzle extending pressure surfaces ( 15 and 16 ) over the entire surface and reach up to the nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934315631 DE4315631A1 (en) | 1993-05-04 | 1993-05-04 | Process and apparatus for welding a port into a plastic bag or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934315631 DE4315631A1 (en) | 1993-05-04 | 1993-05-04 | Process and apparatus for welding a port into a plastic bag or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4315631A1 true DE4315631A1 (en) | 1994-11-10 |
Family
ID=6487761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19934315631 Withdrawn DE4315631A1 (en) | 1993-05-04 | 1993-05-04 | Process and apparatus for welding a port into a plastic bag or the like |
Country Status (1)
| Country | Link |
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| DE (1) | DE4315631A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107745547A (en) * | 2017-11-06 | 2018-03-02 | 温州正钻机械有限公司 | Plastic three-dimensional bag side bottom both sides hotly join exhaust shaped device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1798438U (en) * | 1959-05-06 | 1959-10-22 | Habra Werk Ott Kg | DEVICE FOR HEAT SEALING THE LONGITUDINAL SEAM OF PLASTIC FILMS OD. DGL. WITH HOT AIR. |
| FR2361213A1 (en) * | 1976-08-12 | 1978-03-10 | Bertin & Cie | Flowing fluid platens for laminating thermoplastics - between thin metal covers for high thermal efficiency and short unit cycle times |
| FR2518449A1 (en) * | 1981-12-22 | 1983-06-24 | Blachon Georges | Applying tie cords to continuously extruded thermoplastic film - to simplify support of pendant hollow screens |
| DE3606204A1 (en) * | 1985-04-10 | 1986-10-16 | Windmöller & Hölscher, 4540 Lengerich | DEVICE FOR CONTINUOUSLY WELDING MULTI-LAYER FILM LINES |
| US4876788A (en) * | 1986-11-28 | 1989-10-31 | E. R. Squibb And Sons, Inc. | Method of making a leakproof connection about the outlet tube of a liquid containment bag |
-
1993
- 1993-05-04 DE DE19934315631 patent/DE4315631A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1798438U (en) * | 1959-05-06 | 1959-10-22 | Habra Werk Ott Kg | DEVICE FOR HEAT SEALING THE LONGITUDINAL SEAM OF PLASTIC FILMS OD. DGL. WITH HOT AIR. |
| FR2361213A1 (en) * | 1976-08-12 | 1978-03-10 | Bertin & Cie | Flowing fluid platens for laminating thermoplastics - between thin metal covers for high thermal efficiency and short unit cycle times |
| FR2518449A1 (en) * | 1981-12-22 | 1983-06-24 | Blachon Georges | Applying tie cords to continuously extruded thermoplastic film - to simplify support of pendant hollow screens |
| DE3606204A1 (en) * | 1985-04-10 | 1986-10-16 | Windmöller & Hölscher, 4540 Lengerich | DEVICE FOR CONTINUOUSLY WELDING MULTI-LAYER FILM LINES |
| US4876788A (en) * | 1986-11-28 | 1989-10-31 | E. R. Squibb And Sons, Inc. | Method of making a leakproof connection about the outlet tube of a liquid containment bag |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107745547A (en) * | 2017-11-06 | 2018-03-02 | 温州正钻机械有限公司 | Plastic three-dimensional bag side bottom both sides hotly join exhaust shaped device |
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