DE1121312B - Device for the production of plastic bags with a welded base - Google Patents

Device for the production of plastic bags with a welded base

Info

Publication number
DE1121312B
DE1121312B DEK28612A DEK0028612A DE1121312B DE 1121312 B DE1121312 B DE 1121312B DE K28612 A DEK28612 A DE K28612A DE K0028612 A DEK0028612 A DE K0028612A DE 1121312 B DE1121312 B DE 1121312B
Authority
DE
Germany
Prior art keywords
plate
stamp
film
support plate
stamp plate
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.)
Pending
Application number
DEK28612A
Other languages
German (de)
Inventor
Anton Kolb
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEK28612A priority Critical patent/DE1121312B/en
Publication of DE1121312B publication Critical patent/DE1121312B/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • 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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • 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
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Making Paper Articles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

Vorrichtung zur Herstellung von Kunststoffbeuteln mit angeschweißtem Boden Die Erfindung bezieht sich auf eine Vorrichtung zur Herstellung von Beuteln aus thermoplastischen Kunststoffen durch Aufschweißen eines ebenen Folienstückes als Bodenplatte auf ein als Beutelmantel dienendes schlauchartiges Folienstück. Device for the production of plastic bags with welded Bottom The invention relates to an apparatus for making bags Made of thermoplastic plastics by welding on a flat piece of film as a base plate on a tubular piece of film serving as a bag jacket.

Die ersten Beutel aus Kunststoff wurden wie Papierbeutel oder -tüten aus einem Folienstück gefaltet und an den Nahtstellen überlappend zusammengeklebt oder zusammengeschweißt. Später wurden dann Folien aus thermoplastischen Kunststoffen in Schlauchform hergestellt, beispielsweise im sogenannten Blasverfahren mit Hilfe von Schneckenpressen, und an diese Folien wurde entweder ein Boden angefaltet und verklebt bzw. verschweißt oder das eine Ende des Schlauches durch eine quer zu seiner Längsrichtung geführte Schweißnaht geschlossen. Die Faltung des Bodenteiles ist jedoch zeitraubend, während die ein--fache Quernaht als Bodenverschluß nur für kleine Beutel geeignet ist. The first plastic bags were like paper bags or sachets folded from a piece of foil and glued together overlapping at the seams or welded together. Later foils made of thermoplastics were used manufactured in tubular form, for example in the so-called blowing process with the help of screw presses, and either a bottom was folded and on these foils glued or welded or one end of the hose through a cross to his Longitudinal weld seam closed. The folding of the bottom part is but time consuming, while the simple cross seam as a bottom seal is only for small ones Bag is suitable.

Die chemische Industrie, die Nahrungsmittelindustrie, aber auch andere Industrien gehen in wachsendem Umfang dazu über, körnige oder pulverförmige Güter, insbesondere solche, die vor-schädlichen Einflüssen der Atmosphäre geschützt werden müssen, in Kunststoffbeutel oder -säcke zu verpacken. Dabei wird im allgemeinen ein Beutel aus einer verhältnismäßig dünnen Kunststoffolie verwendet, der zum Schutz gegen mechanische Beschädigung mit einem äußeren Schutzmantel aus Jute, Papier od. dgl. versehen oder in einen Behälter, eine Tonne, ein Faß od. dgl. aus Holz, Pappe oder anderen Werkstoffen eingesetzt wird. Der Kunststoffbeutel besteht dabei vorzugsweise aus einer zähen, biegsamen, luftdichten Folie und soll eine möglichst geringe Durchlässigkeit für Wasser und Wasserdampf besitzen. Für diesen Zweck eignet sich beispielsweise Polyäthylen, das sich auch sehr gut zu Schlauchfolien verarbeiten und durch Anwendung von Wärme und Druck verschweißen läßt. The chemical industry, the food industry, but also others Industries are increasingly turning to granular or powdery goods, especially those that are protected from harmful influences of the atmosphere must be packed in plastic bags or sacks. In general a bag made of a relatively thin plastic film used for protection against mechanical damage with an outer protective jacket made of jute, paper or similar Like. Provided or in a container, a barrel, a barrel or the like. Made of wood, cardboard or other materials are used. The plastic bag is preferably made Made of a tough, flexible, airtight film and should have the lowest possible permeability for water and water vapor. For this purpose, for example, is suitable Polyethylene, which can also be processed very well into tubular films and through application welded by heat and pressure.

Insbesondere die Verwendung dieses Kunststoffes, der außer seiner praktisch absoluten Wasserdichtigkeit auch den Vorteil einer hohen Beständigkeit gegen viele chemische Agenzien besitzt, führte dann dazu, auch Flüssigkeiten aller Art, insbesondere solche aggressiven Charakters, in Kunststoffbeutel zu verpacken, die in einen Schutzbehälter aus Holz, Pappe od. dgl. eingelegt sind. In particular, the use of this plastic, which besides his practically absolute watertightness also has the advantage of high resistance possesses against many chemical agents, then also led to liquids of all Kind, especially those of an aggressive nature, to be packed in plastic bags, which are placed in a protective container made of wood, cardboard or the like.

Für die vorgenannten Zwecke genügten die bisherigen Arten der Bodenausbildung der Kunststoffbeutel nicht mehr. Man hat deshalb vorgeschlagen, an einen Folienschlauch aus thermoplastischem Kunststoff eine ebene Bodenplatte aus dem gleichen Kunststoff anzuschweißen. Zur Wärmezufuhr war dabei ein von elektrischem Strom durchflossener Glühdraht vorgesehen, der entsprechend der Form der Bodenplatte in einem fast geschlossenen Ring angeordnet war und unter gleichzeitiger, impulsartiger Einschaltung des Stromes dem Boden und dem darüberliegenden umgebördelten Rand des Schlauches genähert wurde. Zur Aufnahme der thermischen Dehnung des Glühdrahtes waren über den Umfang verteilte, durch Schleifen überbrückte Stoßfugen vorgesehen. In der Praxis zeigte es sich jedoch, daß an diesen Stoßfugen und an der kleinen Öffnung zwischen den Stromzuführungen gelegentlich eine unvollständige Schweißung erfolgt: Die Schweißnaht ist dann nicht durchgehend in sich geschlossen, so daß der Beutel an diesen Stellen undicht ist. The previous types of soil formation were sufficient for the aforementioned purposes the plastic bag no longer. It has therefore been proposed to use a film tube made of thermoplastic material a flat base plate made of the same plastic to be welded on. There was a heat supply with electric current flowing through it Glow wire provided, which corresponds to the shape of the bottom plate in an almost closed Ring was arranged and with simultaneous, pulsed switching on of the current the bottom and the overlying beaded edge of the hose was approached. To absorb the thermal expansion of the filament, distributed over the circumference, butt joints bridged by grinding provided. In practice, however, it turned out that that at these butt joints and at the small opening between the power leads Occasionally an incomplete weld occurs: The weld seam is then not continuously closed, so that the bag is leaking at these points.

Gerade für die Verpackung von Flüssigkeiten, feinen Pulvern oder auch solchen Substanzen, die gegen Eintritt von Wasser, Luft od. dgl. unbedingt geschützt werden müssen, sind Beutel der besagten Art ungeeignet. Especially for the packaging of liquids, fine powders or including those substances that prevent the ingress of water, air or the like. Unconditionally need to be protected, bags of the said type are unsuitable.

Weiterhin ist es bekannt, den umgefalteten Rand eines Folienschlauches und die daraufgelegte Kunststoffbodenplatte durch einen auf und nieder gehenden erhitzten Stempel unter gleichzeitiger horizontaler Fortbewegung des Randes derart miteinander zu verschweißen, daß sich die einzelnen Schweißpunkte bzw. Schweißflecken dicht oder überlappend aneinanderreihen und so eine zusammenhängende, in sich geschlossene Schweißnaht bilden. Dieses Verfahren, das in gewisser Hinsicht der Arbeitsweise einer Nähmaschine ähnelt, ist sehr zeitraubend und erfordert zudem ausgebildete Arbeitskräfte. It is also known to use the folded edge of a film tube and the plastic base plate placed on it by a moving up and down heated stamp with simultaneous horizontal movement of the edge in this way to weld together that the individual weld points or weld spots Lined up closely or overlapping, creating a coherent, self-contained one Form weld seam. This procedure, in some ways, the way it works resembles a sewing machine, is very time consuming and also requires trained Manpower.

Es ist ferner vorgeschlagen worden, einen den Mantel des Beutels bildenden Kunststoffolienschlauch bis auf einen schmalen, sich nach innen umlegenden Rand über eine der Bodenform des Beutels entsprechende ebene Auflageplatte zu ziehen, auf dieser Auflageplatte an ein Kunststoffolienstück als Boden aufzulegen und nach Umlegen des Randes mittels eines vorgewärmten Rollwerkzeuges längs einer in sich geschlossenen Schweißnaht im Mantel des Beutels zu verschweißen. Dabei treten jedoch zwangläufig Schwierigkeiten dadurch auf, daß beim Umlegen des überstehenden Randes des Bodenstückes Falten entstehen, die keine zuverlässige Schweißung ermöglichen. Schließlich ist auch bei dieser bekannten Vorrichtung das Abschneiden des über die Schweißnaht hinausstehenden Randes der Folie nicht zufriedenstellend gelöst. It has also been proposed to use the jacket of the bag forming plastic film tube except for a narrow, inwardly folded tube To pull the edge over a flat support plate corresponding to the bottom shape of the bag, on this Place the support plate on a piece of plastic film as the floor and after folding over the edge by means of a preheated rolling tool along a to weld closed weld seam in the jacket of the bag. Kick it However, difficulties inevitably arise in that when folding over the protruding At the edge of the bottom piece, folds arise that do not allow reliable welding. Finally, in this known device, too, is the cutting off of the The edge of the film protruding from the weld seam was not solved satisfactorily.

Es ist außerdem eine Vorrichtung zum Verschweißen eines um einen Ring nach außen umgelegten Endes eines Mantelfolienstückes mit einem daraufgelegten kreisfötrnigen Bodenstück bekanntgeworden, bei der das Verschweißen durch ein ringförmiges Hochfrequenzfeld erfolgt. Mit dieser Vorrichtung lassen sich allerdings nur Folien aus solchen Werkstoffen verschweißen, die einen ausreichenden dielektrischen Verlustfaktor bei Hochfrequenz besitzen; beispielsweise eignet sich hierfür Polyäthylen nicht. It is also a device for welding one by one Ring outwardly folded end of a piece of cladding film with a placed on top Kreisfötrnigen base piece became known, in which the welding by an annular High frequency field takes place. However, this device can only be used for foils weld from materials that have a sufficient dielectric loss factor own at high frequency; For example, polyethylene is not suitable for this.

Schließlich ist eine Vorrichtung vorgeschlagen worden, bei der das den Mantel bildende Folienschlauchstück mit dem durch das Bodenblatt zu verschließenden Ende über eine runde, seinen Durchmesser um einige Prozent überschreitende Platte gezogen wird, woraulhin auf diesen nach innen umgelegten Rand der als Mantel dienenden Folie ein ebenes, kreisförmiges Folienstück als Boden aufgelegt und diese beiden Folienstücke durch einen der Platte gegenüber verschiebbaren beheizten Stempel miteinander verschweißt werden. Diese Vorrichtung besitzt jedoch den Nachteil, daß sie, insbesondere bei Beuteln größeren Durchmessers sowie auch bei dünneren. Finally, a device has been proposed in which the the film tube forming the jacket with the to be closed by the bottom sheet End over a round plate that exceeds its diameter by a few percent is pulled, whereupon on this inwardly folded edge of the serving as a coat Foil a flat, circular piece of foil placed on top and these two Pieces of film with one another by means of a heated stamp that can be displaced opposite the plate be welded. However, this device has the disadvantage that they, in particular for bags of larger diameter as well as for thinner ones.

Folien, keine einwandfreie Verschweißung rund um den Umfang des Beutelbodens mit Sicherheit gewährleistet. Diese unsichere Wirkungsweise beruht im vorliegenden Falle darauf, daß bei starr eingespannter Folientrageplatte und starr eingespanntem Stempel durch eine mechanische Parallelführung nicht mit Sicherheit eine tatsächliche Parallelführung der die Schweißung bewirkenden ringförmigen Ränder der beiden vorgenannten Platten sichergestellt ist. Allein durch die Wärmespannungen im Stempel kann leicht ein Verziehen der Ränder aus ihrer Ebene heraus um einen solchen Betrag erfolgen, daß die Schweißung über den Umfang ungleichmäßig und unter Umständen sogar lückenhaft ist. Andererseits erfordern die hier in Frage stehenden Kunststoffe nur verhältnismäßig geringe Axialdrücke, bei denen eine Ausrichtung der starr eingespannten Platten gegeneinander nicht möglich ist.Foils, no perfect welding around the circumference of the bottom of the bag guaranteed with security. This unsafe mode of operation is based in the present Fall on the fact that with rigidly clamped film support plate and rigidly clamped Stamp by a mechanical parallel guide not with certainty an actual one Parallel guidance of the ring-shaped edges of the two aforementioned which cause the weld Plates is ensured. The thermal stresses in the stamp alone can easily the edges are warped out of their plane by such an amount, that the weld is uneven over the circumference and possibly even incomplete is. On the other hand, the plastics in question only require a proportionate amount low axial pressures, in which an alignment of the rigidly clamped plates against each other is not possible.

Die Erfindung bezieht sich also auf eine Vorrichtung zur Herstellung von Beuteln aus thermoplastischen Kunststoffen durch Aufschweißen eines ebenen Folienstückes als Bodenplatte auf den nach innen umgelegten Rand eines als Beutelmantel dienenden schlauchartigen Folienstückes, bestehend aus einer der gewünschten Bodenform des Beutels entsprechenden ebenen Auflageplatte etwas größeren Umfanges als das Folienstück und einer dieser parallel gegenüberstehenden Stempelplatte mit einer ringförmig in sich geschlossenen, ebenen, beheizbaren Andruckfläche. Dabei ist die die Kunststoffolienstücke tragende Auflageplatte gegen die Stempelplatte hin verschiebbar. The invention thus relates to a device for manufacturing of bags made of thermoplastics by welding on a flat piece of film as a base plate on the inwardly folded edge of one serving as a bag jacket tubular piece of film, consisting of one of the desired bottom shape of the The corresponding flat support plate is somewhat larger in size than the piece of film and one of these parallel opposing stamp plates with an annular self-contained, flat, heatable pressure surface. This is the pieces of plastic film load-bearing support plate can be displaced against the stamp plate.

Die Erfindung besteht darin, daß die Stempelplatte von einer Grenzlage aus sowohl parallel zu sich selbst in der Bewegungsrichtung der Auflageplatte verschiebbar als auch gegenüber dieser Bewegungsrichtung kippbar ist und bei Berührung mit der gegen sie geführten Auflageplatte von dieser entgegen der Wirkung einer Rückstellkraft mitgenommen und dabei zwangläufig mit ihrer Andruckfläche parallel zu der durch die Auflageplatte verlaufenden Ebene gestellt wird. Bei dieser Vorrichtung können selbstverständlich auch die Auflageplatte und der Stempel derart gegeneinander vertauscht werden, daß der beheizte Stempel gegen die Auflageplatte geführt wird, wobei diese dann parallel zu sich selbst verschiebbar und kippbar ist. The invention consists in that the stamp plate from a limit position displaceable from both parallel to itself in the direction of movement of the platen and is tiltable with respect to this direction of movement and when in contact with the against them guided support plate by this counter to the action of a restoring force taken along and inevitably with their pressure surface parallel to the through the support plate is placed along the plane. With this device you can Of course, the support plate and the stamp are also interchanged in this way be that the heated stamp is guided against the platen, this can then be slid and tilted parallel to itself.

Die Andruckfläche besteht aus einem in sich geschlossenen, mehr oder weniger schmalen Streifen und kann entweder glatt, gerillt, geriffelt oder mit sonstigen vertieften oder erhabenen Mustern versehen sein, sofern nur eine lückenlos dichte Schweißnaht erzielt wird. The pressure surface consists of a self-contained, more or less narrow stripes and can either be smooth, grooved, corrugated or otherwise be provided with recessed or raised patterns, provided that there is only one seamlessly dense one Weld seam is achieved.

Die Auflageplatte kann durch einen motorischen Antrieb, einen elektrischen Zugmagneten od. dgl. bewegt werden; vorzugsweise ist jedoch vorgesehen, daß die besagte bewegbare Auflageplatte in vertikaler Richtung gegen den Stempel durch eine pneumatische Hebeeinrichtung bewegt wird, die einen starr mit der Auflageplatte verbundenen Kolben, einen diesen führenden feststehenden Zylinder, einen von einem Kompressor od. dgl. auf etwa konstanten Druck aufgeladenen Druckkessel sowie den Zylinder wahlweise mit dem Druckkessel oder der Außenluft verbindende Ventilmittel umfaßt. Diese pneumatische Steuerung der Auflageplatte besitzt einmal den Vorteil, daß die Geschwindigkeit der Plattenbewegung durch die Einströmgeschwindigkeit der Druckluft in den Zylinder beispielsweise mit Hilfe von Hähnen beliebig eingestellt werden kann. Außerdem wird die Auflageplatte ohne harten Schlag weich gegen den Stempel angedrückt. The support plate can be driven by a motor drive, an electric one Pull magnets or the like are moved; however, it is preferably provided that the said movable platen in the vertical direction against the punch by a pneumatic lifting device is moved, which is rigid with the platen connected piston, one of these leading fixed cylinders, one of one Compressor od. The like. To approximately constant pressure charged pressure vessel and the Valve means optionally connecting the cylinder to the pressure vessel or the outside air includes. This pneumatic control of the support plate has the advantage, on the one hand, that the speed of the plate movement by the inflow speed of the Compressed air in the cylinder, for example with the help of taps, can be set as desired can be. In addition, the platen is soft against the without hard impact Stamp pressed on.

Der Stempel kann auf beliebige Weise beheizt sein, beispielsweise durch Gas oder durch eine elektrische Induktionsbeheizung. Vorzugsweise wird jedoch der Stempel durch eine elektrische Widerstandsheizung mit Hilfe von in ihm eingebetteten oder ihn umhüllenden Heizelementen beheizt. The stamp can be heated in any way, for example by gas or by electrical induction heating. Preferably, however the stamp by an electrical resistance heater with the help of embedded in it or heating elements surrounding it.

Um die Temperatur des Stempels auf dem für die Schweißung erforderlichen Wert zu halten, genügt es, im einfachsten Falle die ihm elektrisch zugeführte Heizleistung entsprechend zu dosieren. To get the temperature of the stamp on the one required for the weld To maintain its value, it is sufficient in the simplest case to use the heating power supplied to it electrically to dose accordingly.

Eine bessere Konstanthaltung der Temperatur wird durch Verwendung eines Thermostats erzielt, der die Temperatur des Stempels selbsttätig mit Hilfe eines in den Stempel eingesetzten Temperaturfühlers an sich bekannter Bauart und Wirkungsweise auf einen einstellbaren Sollwert einregelt. A better way of keeping the temperature constant is by using a thermostat achieved, which the temperature of the stamp automatically with the help a temperature sensor of known type and used in the stamp Operating principle regulates to an adjustable setpoint.

Die Rückstellkraft wird vorzugsweise durch die Stempelplatte in ihre Grenzlage drückende Federmittel und/oder durch das Gewicht der Stempelplatte, gegebenenfalls um zusätzliche Auflagegewichte vermehrt, aufgebracht. The restoring force is preferably implemented by the stamp plate in its Boundary position pressing spring means and / or by the weight of the stamp plate, if necessary increased by additional weights applied.

Vorzugsweise wird weiterhin eine die Stempelplatte tragende feste Säule mit einem an ihrem unteren Ende befestigten, sie in radialer Richtung überragenden und sich nach unten hin erweiternden Tragekonus vorgeschlagen, der in eine entsprechende nach unten konisch erweiterte Mittelöffnung der Stempelplatte eingreift. Durch diese Halterung der Stempelplatte ist jederzeit die gewünschte Parallelverschiebung sowie auch die Kippbewegung der Stempelplatte möglich. In addition, a fixed one carrying the stamp plate is preferably used Column with a fixed at its lower end, it protrudes in the radial direction and downwardly widening support cone proposed in a corresponding engages downwardly widened central opening of the stamp plate. Through this Holder of the stamp plate is the desired parallel shift at any time as well as the tilting movement of the stamp plate is possible.

Um auch geringe Unebenheiten der Auflageplatte oder der Arbeitsfläche und gegebenenfalls Dickenabweichungen der Folie über den Umfang hin auszugleichen, wird erfindungsgemäß eine vor dem Überziehen des Folienschlauches auf die dem umgelegten Rand des Schlauches zugewandte Seite der Auflageplatte aufgelegte dünne, gummielastische Druckverteilungsplatte vorgesehen. Even minor unevenness of the support plate or the work surface and, if necessary, to compensate for deviations in the thickness of the film over the circumference, according to the invention, a before the film tube is pulled onto the folded over The edge of the tube facing the side of the support plate is thin, rubber-elastic Pressure distribution plate provided.

Claims (5)

PATENTANSPRÜCHE: 1. Vorrichtung zur Herstellung von Beuteln aus thermoplastischen Kunststoffen durch Aufschweißen eines ebenen Folienstückes als Bodenplatte auf den nach innen umgelegten Rand eines als Beutelmantel dienenden schlauchartigen Folienstückes, bestehend aus einer der gewünschten Bodenform des Beutels entsprechenden ebenen Auflageplatte etwas größeren Umfanges als das Folienstück und einer dieser parallel gegenüberstehenden Stempelplatte mit einer ringförmig in sich geschlossenen, ebenen, beheizbaren Andruckfläche, wobei die die Kunststoffolienstücke tragende Auflageplatte gegen die Stempelplatte hin verschiebbar ist. dadurch gekennzeichnet, daß die Stempelplatte (18) von einer Grenzlage aus sowohl parallel zu sich selbst in der Bewegungsrichtung der Auflageplatte (1) verschiebbar als auch gegenüber dieser Bewegungsrichtung kippbar ist und bei Berührung mit der gegen sie geführten Auflageplatte von dieser entgegen der Wirkung einer Rückstellkraft mitgenommen und dabei zwangläufig mit ihrer Andruckfläche (19) parallel zu der durch die Auflageplatte verlaufenden Ebene gestellt wird. PATENT CLAIMS: 1. Device for the production of bags from thermoplastic Plastics by welding a flat piece of film as a base plate onto the inwardly folded edge of a tubular piece of film serving as a bag jacket, consisting of a level corresponding to the desired bottom shape of the bag Support plate slightly larger in size than the piece of film and one of these parallel opposite stamp plate with a ring-shaped, self-contained, flat, heatable pressure surface, with the support plate carrying the pieces of plastic film is displaceable towards the stamp plate. characterized in that the stamp plate (18) from a limit position both parallel to itself in the direction of movement the support plate (1) can be displaced and tilted with respect to this direction of movement and when it comes into contact with the support plate that is guided against it the effect of a restoring force and inevitably with their contact surface (19) is placed parallel to the plane running through the platen. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Rückstellkraft durch die Stempelplatte (18) in ihre Grenzlage drückende Federmittel (22) aufgebracht wird. 2. Apparatus according to claim 1, characterized in that the restoring force applied by the stamp plate (18) in its limit position pressing spring means (22) will. 3. Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Rückstellkraft durch das Gewicht der Stempelplatte, gegebenenfalls um zusätzliche Auflagegewichte vermehrt. gebildet wird. 3. Apparatus according to claim 1 and 2, characterized in that the restoring force due to the weight of the stamp plate, possibly by additional Edition weights increased. is formed. 4. Vorrichtung nach Anspruch 1 bis 3, gekennzeichnet durch eine die Stempelplatte tragende feste Säule (20) mit einem an ihrem unteren Ende befestigten, sie in radialer Richtung überragenden und sich nach unten hin erweiternden Tragekonus (21), der in eine entsprechende nach unten konisch erweiterte Mittelöffnung der Stempelplatte eingreift. 4. Apparatus according to claim 1 to 3, characterized by a die Fixed column (20) carrying the stamp plate with a fixed at its lower end, they protruding in the radial direction and widening downward support cone (21), which is in a corresponding downwardly widened central opening of the Stamp plate engages. 5. Vorrichtung nach Anspruch 1 bis 4, gekennzeichnet durch eine vor dem Überziehen des Folienschlauches (14) auf die dem umgelegten Rand (15) des Schlauches zugewandte Seite der Auflageplatte (1) aufgelegte dünne, gummielastische Druckverteilungsplatte (12). 5. Apparatus according to claim 1 to 4, characterized by a front the covering of the film tube (14) on the folded edge (15) of the tube facing side of the support plate (1) applied thin, rubber-elastic pressure distribution plate (12). In Betracht gezogene Druckschriften: Deutsches Gebrauchsmuster Nr. 1 752 598; französische Patentschrift Nr. 1 098 288; britische Patentschrift Nr. 741 991. in Betracht gezogene ältere Patente: Deutsches Patent Nr. 1 062 004. Considered publications: German utility model no. 1,752,598; French Patent No. 1,098,288; British Patent No. 741 991. Earlier patents considered: German Patent No. 1 062 004.
DEK28612A 1956-04-17 1956-04-17 Device for the production of plastic bags with a welded base Pending DE1121312B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028769A1 (en) * 1980-03-06 1981-09-17 Sumitomo Bakelite Co. Ltd. METHOD AND DEVICE FOR ATTACHING A PLASTIC FLOOR PLATE AT THE END OF A PLASTIC HOLLOW CYLINDER
DE3715356A1 (en) * 1987-05-08 1988-12-01 Benz & Hilgers Gmbh DEVICE FOR SEALING COVER FILMS ON PACKAGING CONTAINERS, IN PARTICULAR PLASTIC CUP

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1098288A (en) * 1953-03-10 1955-07-21 Futs Metalliques Gallay Method and apparatus for making a round bottom bag
GB741991A (en) * 1952-06-11 1955-12-14 Communications Patents Ltd Improvements in and relating to tubular structures formed from a thermoplastic
DE1752598B1 (en) * 1967-06-22 1971-09-30 Atlas Copco Ab Drill support

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB741991A (en) * 1952-06-11 1955-12-14 Communications Patents Ltd Improvements in and relating to tubular structures formed from a thermoplastic
FR1098288A (en) * 1953-03-10 1955-07-21 Futs Metalliques Gallay Method and apparatus for making a round bottom bag
DE1752598B1 (en) * 1967-06-22 1971-09-30 Atlas Copco Ab Drill support

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028769A1 (en) * 1980-03-06 1981-09-17 Sumitomo Bakelite Co. Ltd. METHOD AND DEVICE FOR ATTACHING A PLASTIC FLOOR PLATE AT THE END OF A PLASTIC HOLLOW CYLINDER
DE3715356A1 (en) * 1987-05-08 1988-12-01 Benz & Hilgers Gmbh DEVICE FOR SEALING COVER FILMS ON PACKAGING CONTAINERS, IN PARTICULAR PLASTIC CUP

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