FR2909583A1 - THERMOFORMING MACHINE - Google Patents

THERMOFORMING MACHINE Download PDF

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Publication number
FR2909583A1
FR2909583A1 FR0758670A FR0758670A FR2909583A1 FR 2909583 A1 FR2909583 A1 FR 2909583A1 FR 0758670 A FR0758670 A FR 0758670A FR 0758670 A FR0758670 A FR 0758670A FR 2909583 A1 FR2909583 A1 FR 2909583A1
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FR
France
Prior art keywords
sealing
installation
pressure
thermoforming machine
piston
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.)
Granted
Application number
FR0758670A
Other languages
French (fr)
Other versions
FR2909583B1 (en
Inventor
Martin Beck
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.)
Ampack GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of FR2909583A1 publication Critical patent/FR2909583A1/en
Application granted granted Critical
Publication of FR2909583B1 publication Critical patent/FR2909583B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/162—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by feeding web material to securing means
    • B65B7/164—Securing by heat-sealing
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • 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
    • B29C66/80—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
    • B29C66/814—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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • 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
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92651—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by using stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/266—Auxiliary operations after the thermoforming operation
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81465—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed behind the other in a single row in the feed direction
    • 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
    • B29C66/8163—Self-aligning to the joining plane, e.g. mounted on a ball and socket
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • B29C66/92431—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being kept constant over time
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Package Closures (AREA)
  • Closing Of Containers (AREA)

Abstract

Machine de thermoformage comprenant une installation de chauffage (2), une installation de scellement (3) équipant l'installation de chauffage (2) et scellant en un film de couverture (11) sur un récipient (10), une unité à piston (4) étant reliée à l'installation de chauffage (2) et une installation de pression agissant sur l'unité de piston (4).L'installation de pression comprenant une chambre de pression (7) remplie de gaz, reliée à l'unité de piston (4).A thermoforming machine comprising a heating installation (2), a sealing installation (3) equipping the heating installation (2) and sealing a cover film (11) on a container (10), a piston unit ( 4) being connected to the heating installation (2) and a pressure device acting on the piston unit (4) .The pressure installation comprising a pressure chamber (7) filled with gas, connected to the piston unit (4).

Description

1 Domaine de l'invention La présente invention concerne une machine deFIELD OF THE INVENTION The present invention relates to a machine for

thermoformage comprenant une installation de chauffage, une installation de scellement équipant l'installation de chauffage et scellant en un film de couverture sur un récipient, une unité à piston étant reliée à l'installation de chauffage. Etat de la technique Selon le document DE-197 37 503-Al on connaît une machine de thermoformage fabriquant des récipients en forme de gobelets à partir d'une nappe d'un film thermoformable. Elle remplit les gobelets et ensuite elle les scelle avec un film de couverture. Pour cela il est prévu une installation de scellement à chaud du film de couverture qui descend sur les gobelets arrivant sous l'installation de scellement à chaud pour sceller le film de couverture sur les gobelets. Mais on a constaté notamment qu'en fonction des variations d'épaisseurs du film dans lequel est fabriqué le gobelet et du film de couverture, le scellement à chaud était variable si bien que le gobelet sera scellé trop fortement ou ne le sera que partiellement. Cela se traduit par des difficultés à l'ouverture du gobelet dont on n'arrive pas à enlever le couvercle scellé, ou qui se déchire à l'ouverture. Exposé et avantages de l'invention La présente invention concerne une machine de thermoformage du type défini ci-dessus caractérisée en ce qu'une installation de pression agissant sur l'unité de piston comprend une chambre de pression remplie de gaz, reliée à l'unité de piston. La machine de thermoformage selon l'invention offre l'avantage vis-à-vis de l'état de la technique de comporter une installation de scellement qui réalise le scellement avec une force constante indépendante de la course du couvercle sur le récipient par exemple un gobelet. La machine comporte une installation de pression avec une chambre de pression remplie de gaz. La compressibilité du gaz permet d'avoir une certaine élasticité lors de la phase de scellement au contact de l'installation de scellement et du film de couverture ou du récipient à sceller, ce qui permet de compenser en particulier les 2909583 2 variations d'épaisseur du récipient. La machine de thermoformage selon l'invention est particulièrement simple et d'une structure compacte. De manière particulièrement avantageuse, la machine de thermoformage comprend une installation de régulation pour assurer la 5 régulation continue de la pression dans la chambre de pression. Cela permet une adaptation rapide et simple de la machine à des produits à sceller, différents ou des films différents. La régulation de la pression dans la chambre de pression permet d'assurer une force de scellement différente par l'installation de scellement et cela de manière simple et 10 économique. L'installation de régulation est d'une manière particulièrement préférentielle une installation de dosage réglable ou une soupape de limitation de pression réglable qui permet de fournir une pression supérieure prédéfinie à la chambre de pression. En outre de manière préférentielle, la machine de 15 thermoformage comporte plusieurs installations de scellement ayant chacune sa propre unité à piston. Il est prévu une chambre de pression de l'installation de pression reliée à chacune des unités à piston de l'ensemble des installations de scellement. Cela permet de réaliser une machine qui assure simultanément le scellement d'un grand nombre de 20 récipients avec un film de couverture et toutes ces installations disposent de la même pression et ainsi d'une force de scellement constante identique. La structure de la machine est très simple et économique. D'une manière particulièrement avantageuse, l'unité à 25 piston comprend un cylindre installé avec un faible jeu dans un guide. Ce faible jeu permet à l'unité à piston portant l'installation de scellement, de s'incliner quelque peu par rapport à la direction verticale de scellement ce qui assure une adaptation automatique de l'installation de scellement par exemple à des récipients à sceller et qui 30 seraient légèrement inclinés. En particulier dans le cadre d'un maintien constant de la force de scellement par l'installation de scellement, on assure un scellement garanti et sans dommage des récipients si ceux-ci n'arrivent pas complètement en position horizontale. Pour une adaptation rapide et simple de la machine selon l'invention à des conditions différentes relatives aux récipients, 2909583 3 l'installation de scellement est montée de préférence de manière amovible sur l'installation de chauffage ce qui permet un échange rapide de l'installation de scellement, et ainsi une transformation simple et rapide de la machine pour un nouveau récipient à sceller.  thermoforming comprising a heating installation, a sealing installation equipping the heating installation and sealing a cover film on a container, a piston unit being connected to the heating installation. STATE OF THE ART According to document DE-197 37 503-A1 a thermoforming machine is known that manufactures cup-shaped containers from a sheet of thermoformable film. She fills the cups and then she seals them with a cover film. For this purpose there is provided a heat seal installation of the cover film which descends on the cups arriving under the heat sealing plant to seal the cover film on the cups. However, it has been found that, depending on the thickness variations of the film in which the cup is made and the cover film, the heat sealing is variable, so that the cup will be sealed too strongly or only partially. This results in difficulties in opening the cup which we can not remove the sealed cover, or tearing at the opening. DESCRIPTION AND ADVANTAGES OF THE INVENTION The present invention relates to a thermoforming machine of the type defined above characterized in that a pressure device acting on the piston unit comprises a pressure chamber filled with gas, connected to the piston unit. The thermoforming machine according to the invention offers the advantage vis-à-vis the state of the art to include a sealing installation that carries out the sealing with a constant force independent of the stroke of the lid on the container for example a cup. The machine comprises a pressure plant with a pressure chamber filled with gas. The compressibility of the gas makes it possible to have a certain elasticity during the sealing phase in contact with the sealing installation and the covering film or the container to be sealed, which makes it possible to compensate in particular for the variations in thickness. of the container. The thermoforming machine according to the invention is particularly simple and of a compact structure. Particularly advantageously, the thermoforming machine comprises a regulating installation for continuously regulating the pressure in the pressure chamber. This allows a quick and easy adaptation of the machine to seal products, different or different films. The regulation of the pressure in the pressure chamber makes it possible to ensure a different sealing force by the sealing installation in a simple and economical manner. The regulating installation is particularly preferably an adjustable metering device or an adjustable pressure limiting valve which makes it possible to provide a predefined upper pressure to the pressure chamber. Also preferably, the thermoforming machine has a plurality of sealing installations each having its own piston unit. There is provided a pressure chamber of the pressure plant connected to each of the piston units of all sealing facilities. This makes it possible to produce a machine which simultaneously seals a large number of containers with a cover film and all these installations have the same pressure and thus an identical constant sealing force. The structure of the machine is very simple and economical. In a particularly advantageous manner, the piston unit comprises a cylinder installed with a small clearance in a guide. This low clearance allows the piston unit carrying the sealing installation, to tilt somewhat with respect to the vertical direction of sealing which ensures an automatic adaptation of the sealing installation for example to containers to seal and which would be slightly inclined. Particularly in the context of a constant maintenance of the sealing force by the sealing installation, it ensures a guaranteed seal and without damage to the containers if they do not arrive completely in a horizontal position. For a quick and simple adaptation of the machine according to the invention to different conditions relating to the containers, the sealing installation is preferably removably mounted on the heating installation which allows rapid exchange of the sealing installation, and thus a simple and fast transformation of the machine for a new container to be sealed.

5 Le gaz de l'installation de pression est de préférence de l'air ou de l'azote. En outre de façon avantageuse la machine selon l'invention comporte une unité de déplacement pour raccrocher par en-dessous un récipient à sceller contre l'installation de scellement. Cela 10 permet de simplifier considérablement en particulier la structure de l'installation de scellement, car il n'y a aucune installation de déplacement pour déplacer l'installation de scellement. L'installation de scellement est positionnée dans une certaine position uniquement par la pression du gaz dans la chambre de pression et ensuite le récipient à 15 sceller est rapproché par en-dessous contre l'installation de scellement. De manière préférentielle, l'unité à piston présente une première surface de piston en contact avec le gaz dans la chambre de pression et une seconde surface de piston délimitant le mouvement de l'unité à piston contre une butée.The gas of the pressure plant is preferably air or nitrogen. Further advantageously the machine according to the invention comprises a displacement unit for hanging from below a container to be sealed against the sealing installation. This considerably simplifies the structure of the sealing plant, since there is no moving device for moving the sealing plant. The sealing installation is positioned in a certain position only by the pressure of the gas in the pressure chamber and then the sealing vessel is brought closer below against the sealing plant. Preferably, the piston unit has a first piston surface in contact with the gas in the pressure chamber and a second piston surface defining the movement of the piston unit against a stop.

20 L'installation de scellement est de manière particulièrement avantageuse de forme annulaire ou plane, ce qui permet de sceller un récipient tel que par exemple un gobelet avec un film de couverture passant entre le gobelet et l'installation de scellement.The sealing installation is particularly advantageously of annular or planar shape, which makes it possible to seal a container such as, for example, a cup with a covering film passing between the cup and the sealing installation.

25 La machine de thermoformage selon l'invention peut être intégrée notamment dans une installation d'ensemble qui réalise par exemple un récipient en forme de gobelet à partir d'un film au cours d'une première étape puis remplit le gobelet avec un produit tel que du yaourt ou un produit alimentaire sec, puis scelle le récipient avec un 30 film de couverture. Comme la machine de thermoformage selon l'invention est très compacte et très simple, elle peut se monter sans difficulté dans une telle installation globale.The thermoforming machine according to the invention can be integrated in particular into an overall installation which for example produces a cup-shaped container from a film during a first step and then fills the cup with a product such as only yogurt or a dry food product, then seals the container with a cover film. As the thermoforming machine according to the invention is very compact and very simple, it can be mounted without difficulty in such a global installation.

2909583 Dessins La présente invention sera décrite ci-après de manière plus détaillée à l'aide d'un exemple de machine de thermoformage représentée dans le dessin annexé dans lequel : 5 - la figure unique est une vue en coupe schématique d'une machine de thermoformage correspondant au premier exemple de réalisation de l'invention. Description d'un mode de réalisation préférentiel de l'invention En référence à l'unique figure, on décrira ci-après de 10 manière détaillée une machine de thermoformage 1 correspondant à un premier exemple de réalisation de l'invention. Selon la figure unique, la machine de thermoformage 1 comporte deux unités de thermoformage la, lb juxtaposées, ayant la même construction et dont les composants portent les mêmes 15 références. Chaque unité de thermoformage la, lb comporte une installation de chauffage 2 à laquelle est fixée de manière amovible une installation de scellement 3. L'installation de scellement 3 peut ainsi se détacher simplement de l'installation de chauffage 2 et être remplacée par une autre installation de scellement. L'installation de scellement 3 20 de cet exemple de réalisation comporte une pièce d'extrémité de forme annulaire ayant un diamètre correspondant au bord de scellement d'un gobelet 10 que l'on veut sceller avec un film de couverture 11. Chaque unité de thermoformage la, lb comporte en outre une unité à piston 4 qui dans cet exemple de réalisation se compose principalement de 25 quatre parties. L'installation de chauffage 2 est fixée à l'unité de piston 4 qui la soulève et la descend en commun avec l'installation de scellement 3 dans la direction longitudinale X-X de l'unité à piston 4. L'unité à piston 4 présente une première surface de piston 4a, une seconde surface de piston 4b de diamètre légèrement 30 supérieur à la première surface de piston 4a, un cylindre de liaison 4d entre la première surface de piston 4a et la seconde surface de piston 4b ainsi qu'un cylindre 4c. Le cylindre 4c est guidé dans un guide 5a d'un bloc de réception 5. Il y a un intervalle 5b entre le cylindre 4c et le guide 5a. A la figure, cet intervalle est représenté de façon exagérée. En 35 outre, la machine de thermoformage 1 comporte une plaque de 4 2909583 5 couverture 6 fixée au bloc de réception 5. La plaque de couverture 6 comporte une chambre de pression 7 recevant un gaz par exemple de l'air. La chambre de pression 7 est reliée par une conduite à une source de pression 8. Une soupape de régulation de pression 9 est en outre 5 prévue entre la source de pression 8 et la chambre de pression 7 pour régler une pression P dans la chambre de pression 7. Comme le montre la figure 1, la première surface de piston 4a de l'unité de piston 4 communique avec la chambre de pression 7. Pour éviter une fuite de la chambre de pression 7, la première surface de piston 4a comporte un 10 joint de piston 14. La machine de thermoformage 1 du premier exemple de réalisation comprend en outre une unité de soulèvement 12 qui reçoit des gobelets à sceller avec le film de couverture 11. L'unité de soulèvement 12 peut être soulevée dans la direction de la flèche B ou 15 être abaissée pour pousser le gobelet 10 avec le film de couverture 11 contre l'installation de scellement 3, chaude. Les gobelets 10 ainsi scellés comme l'indique la flèche C sont sortis dans la direction horizontale hors de la machine de thermoformage. Le bloc de réception 5 comporte en outre une butée 15 20 servant de butée pour la seconde surface de piston 4b de l'unité à piston 4. Cette butée limite le mouvement de l'unité à piston 4 vers le bas. Le fonctionnement de la machine de thermoformage 1 est le suivant : dans une première étape, une installation de régulation non 25 représentée prédéfinit un niveau de pression pour la chambre de pression 7 en fonction des gobelets 10 à sceller. Pour cela la source de pression 8 constituée par exemple par un compresseur, fournit du gaz sous pression à travers la soupape de régulation de pression 9 à la chambre de pression 7. La soupape de régulation de pression 9 régule 30 ainsi la pression sur le niveau de pression P dans la chambre de pression 7. La pression dans la chambre de pression 7 est surveillée dans cet exemple par des capteurs de pression. La pression P dans la chambre de pression 7 fait descendre l'unité à piston 4 comme cela est indiqué par la flèche A. Le mouvement de l'unité à piston 4 est limité 35 par la butée 15 qui rencontre la seconde surface de piston 4b. Comme il 2909583 6 faut maintenir en permanence la pression dans la chambre de pression 7, l'unité à piston 4 reste dans la position représentée à la figure 1 dans laquelle la seconde surface de piston 4b est appliquée contre la butée 15. En outre, l'installation de chauffage 2 a été actionnée pour chauffer 5 l'installation de scellement 2 par transfert de chaleur à partir de l'installation de chauffage 2. L'installation de chauffage 2, distincte peut chauffer l'installation de scellement 3 par conduction thermique par l'installation de chauffage 2 ce qui permet de remplacer facilement pour sceller des récipients de forme différente. io Dans l'étape suivante on fournit les gobelets 10 remplis d'un produit tel que du yaourt, et un film de couverture 11 appliqué librement sous l'installation de scellement 3. Cela peut se faire par exemple avec une pince. Les gobelets 10 sont placés sur l'unité de soulèvement 12 pour être soulevés avec l'installation de levage 12 par la 15 flèche B, c'est-à-dire contre l'installation de scellement 3, chaude. Le film de couverture 11 est ainsi scellé au gobelet 10. Comme l'installation de scellement 3 est reliée par l'installation de chauffage 2 et l'unité à piston 4 à la chambre de pression 7 pendant que le gobelet 10 est pressé par l'unité de levage 12, la suspension de la force 20 d'application du gobelet 12 peut suffire puisque le gaz de la chambre de pression 7 est compressible. Cela garantit que le gobelet 10 ne risque pas d'être poussé avec une force trop importante contre l'installation de scellement 3 de sorte qu'il serait scellé soit de manière insuffisante soit de manière excessive. La compressibilité du gaz dans la chambre de 25 pression 7 garantit ainsi une certaine élasticité à l'installation de scellement 3 si bien que l'on compense par exemple une course trop grande de l'unité de soulèvement 12 en ce que l'installation de scellement 3 peut s'échapper vers le haut. De même on peut compenser de façon garantie, les variations d'épaisseur du bord de scellement du 30 gobelet et du film. La chambre de pression 7 coopère ainsi de façon analogue avec un cylindre à ressort à gaz. Dans le cas de la machine de thermoformage représentée à la figure, on a deux installations de scellement 3 juxtaposées. Les deux installations de scellement 3 ont une structure identique et 35 chacune a une première surface de piston 4a pour l'unité à piston 4 2909583 7 avec une chambre de pression 7 commune. Cela garantit que pour chaque installation de scellement 3 on dispose de la même pression P et ainsi en même temps des mêmes forces de scellement. La structure de la machine de thermoformage peut être ainsi très simple et économique 5 car seules sont nécessaires des conduites de liaison vers les différentes unités à piston 4 des installations de scellement 3. Il est à remarquer que la machine de thermoformage peut comporter évidemment également plus de deux installations de scellement. Les installations de scellement peuvent être installées l'une à la suite de l'autre et/ou en io parallèle. Par exemple les installations de scellement peuvent être juxtaposées en plusieurs rangées ou être disposées les unes derrière les autres pour que l'ensemble de la palette par exemple de gobelets à yaourts puissent être scellés en même temps avec un film de couverture. Ainsi selon l'invention, on peut sceller un grand nombre de 15 récipients avec un film de couverture et de façon simple, pour chaque installation de scellement il faut s'assurer que l'on dispose des mêmes forces de suspension ou de scellement. Cela garantit la sécurité et le contact de fermeture des gobelets 10. 20 25 15The present invention will be described in more detail below with the aid of an exemplary thermoforming machine shown in the accompanying drawing in which: the single figure is a schematic sectional view of a machine thermoforming corresponding to the first embodiment of the invention. DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION With reference to the single figure, a thermoforming machine 1 corresponding to a first embodiment of the invention will be described in detail below. According to the single figure, the thermoforming machine 1 comprises two thermoforming units 1a, 1b juxtaposed, having the same construction and whose components have the same references. Each thermoforming unit 1a, 1b comprises a heating installation 2 to which a sealing installation 3 is removably attached. The sealing installation 3 can thus simply be detached from the heating installation 2 and be replaced by another sealing installation. The sealing apparatus 3 of this embodiment has an annular end piece having a diameter corresponding to the sealing edge of a cup 10 which is to be sealed with a cover film 11. Each unit of Thermoforming 1a, 1b further comprises a piston unit 4 which in this embodiment consists mainly of four parts. The heating system 2 is attached to the piston unit 4 which lifts it and goes down in common with the sealing unit 3 in the longitudinal direction XX of the piston unit 4. The piston unit 4 has a first piston surface 4a, a second piston surface 4b of a diameter slightly greater than the first piston surface 4a, a connecting cylinder 4d between the first piston surface 4a and the second piston surface 4b and a cylinder 4c. The cylinder 4c is guided in a guide 5a of a receiving block 5. There is a gap 5b between the cylinder 4c and the guide 5a. In the figure, this interval is represented in an exaggerated way. In addition, the thermoforming machine 1 comprises a cover plate 6 fixed to the receiving block 5. The cover plate 6 comprises a pressure chamber 7 receiving a gas, for example air. The pressure chamber 7 is connected by a pipe to a source of pressure 8. A pressure regulating valve 9 is further provided between the pressure source 8 and the pressure chamber 7 to adjust a pressure P in the chamber of pressure. pressure 7. As shown in Figure 1, the first piston surface 4a of the piston unit 4 communicates with the pressure chamber 7. To prevent leakage of the pressure chamber 7, the first piston surface 4a has a The thermoforming machine 1 of the first exemplary embodiment further comprises a lifting unit 12 which receives cups to be sealed with the cover film 11. The lifting unit 12 can be raised in the direction of the arrow B or be lowered to push the cup 10 with the cover film 11 against the sealing installation 3, hot. The cups 10 thus sealed as indicated by the arrow C are out in the horizontal direction out of the thermoforming machine. The receiving block 5 further comprises a stopper 20 serving as a stop for the second piston surface 4b of the piston unit 4. This stop limits the movement of the piston unit 4 downwards. The operation of the thermoforming machine 1 is as follows: in a first step, a control installation not shown depicts a pressure level for the pressure chamber 7 as a function of the cups 10 to be sealed. For this purpose, the pressure source 8 constituted for example by a compressor, supplies gas under pressure through the pressure regulating valve 9 to the pressure chamber 7. The pressure regulating valve 9 thus regulates the pressure on the pressure level. pressure P in the pressure chamber 7. The pressure in the pressure chamber 7 is monitored in this example by pressure sensors. The pressure P in the pressure chamber 7 lowers the piston unit 4 as indicated by the arrow A. The movement of the piston unit 4 is limited by the stop 15 which meets the second piston surface 4b . Since the pressure in the pressure chamber 7 must be maintained continuously, the piston unit 4 remains in the position shown in FIG. 1, in which the second piston surface 4b is applied against the abutment 15. In addition, the heating plant 2 has been actuated to heat the heat-transfer sealing plant 2 from the heating plant 2. The separate heating system 2 can heat the sealing plant 3 by conduction. heat by the heating system 2 which allows to easily replace to seal containers of different shape. In the following step the cups 10 filled with a product such as yoghurt and a cover film 11 applied freely under the sealing plant 3 are provided. This can be done for example with a clamp. The cups 10 are placed on the lifting unit 12 to be raised with the lifting device 12 by the boom B, i.e. against the hot sealing plant 3. The cover film 11 is thus sealed to the cup 10. As the sealing installation 3 is connected by the heating installation 2 and the piston unit 4 to the pressure chamber 7 while the cup 10 is pressed by the 12, the suspension of the application force of the cup 12 may suffice since the gas of the pressure chamber 7 is compressible. This ensures that the cup 10 will not be pushed too much force against the sealer 3 so that it would be sealed either insufficiently or excessively. The compressibility of the gas in the pressure chamber 7 thus guarantees a certain elasticity to the sealing installation 3, so that, for example, an excessive stroke of the lifting unit 12 is compensated in that the installation of sealing 3 can escape upwards. Similarly, the thickness variations of the sealing edge of the cup and the film can be compensated for in a guaranteed way. The pressure chamber 7 thus cooperates in a similar way with a gas spring cylinder. In the case of the thermoforming machine shown in the figure, there are two juxtaposed sealing installations 3. The two sealers 3 have the same structure and each has a first piston surface 4a for the piston unit 4 with a common pressure chamber 7. This ensures that for each sealing installation 3 the same pressure P is available and thus at the same time the same sealing forces. The structure of the thermoforming machine can thus be very simple and economical because only connecting lines are required to the various piston units 4 of the sealing installations 3. It should be noted that the thermoforming machine can obviously also include more two sealing installations. The sealing installations may be installed one after the other and / or in parallel. For example the sealing installations can be juxtaposed in several rows or be arranged one behind the other so that the entire pallet for example yogurt cups can be sealed at the same time with a cover film. Thus, according to the invention, a large number of containers can be sealed with a cover film and in a simple manner, for each sealing installation it must be ensured that the same suspension or sealing forces are available. This guarantees the safety and closing contact of the cups 10. 20 25 15

Claims (3)

REVENDICATIONS 1 ) Machine de thermoformage comprenant une installation de chauffage (2), une installation de scellement (3) équipant l'installation de chauffage (2) et scellant en un film de couverture (11) sur un récipient (10), une unité à piston (4) étant reliée à l'installation de chauffage (2) et une installation de pression agissant sur l'unité de piston (4), l'installation de pression comprenant une chambre de pression (7) remplie de gaz, reliée à l'unité de piston (4).  1) A thermoforming machine comprising a heating installation (2), a sealing installation (3) equipping the heating installation (2) and sealing a cover film (11) on a container (10), a unit piston (4) being connected to the heating system (2) and a pressure device acting on the piston unit (4), the pressure system comprising a pressure chamber (7) filled with gas, connected to the piston unit (4). 2 ) Machine de thermoformage selon la revendication 1, comprenant en outre une installation de régulation (9) pour réguler en continu la pression dans la chambre de pression (7).2) thermoforming machine according to claim 1, further comprising a regulating installation (9) for continuously regulating the pressure in the pressure chamber (7). 3 ) Machine de thermoformage selon la revendication 2, caractérisée en ce que l'installation de régulation (9) est une soupape de limitation de pression, réglable ou un organe d'étranglement réglable. 20 4 ) Machine de thermoformage selon la revendication 1, caractérisée en ce qu' elle comprend un ensemble d'installations de scellement (3) ayant chacune sa propre unité à piston (4), l'installation de pression ayant 25 une chambre de pression (7) commune reliée à chacune des unités à piston (4). 5 ) Machine de thermoformage selon la revendication 1, caractérisée en ce que 30 l'unité à piston (4) comprend un cylindre (4c) logé dans un guide (5a) avec un faible jeu (5b). 6 ) Machine de thermoformage selon la revendication 1, caractérisée en ce que 2909583 9 l'installation de scellement (3) est montée de façon amovible sur l'installation de chauffage (2). 7 ) Machine de thermoformage selon la revendication 1, 5 caractérisée en ce que le gaz de la chambre de pression (7) est de l'air ou de l'azote. 8 ) Machine de thermoformage selon la revendication 1, caractérisée en ce qu' 10 elle comprend en outre une unité de déplacement (12) pour pousser un récipient (10) à sceller et un film de couverture (11) par en dessous contre l'installation de scellement (3). 9 ) Machine de thermoformage selon la revendication 1, caractérisée en ce que l'unité à piston (4) comprend une première surface de piston (4a) et une seconde surface de piston (4b), la première surface de piston (4a) étant en contact avec le gaz de la chambre de pression (7) et la seconde surface de piston (4b) limitant le mouvement de l'unité de piston (4) par une butée (15). 10 ) Machine de thermoformage selon la revendication 1, caractérisée en ce que l'installation de scellement (3) est de forme annulaire ou plane et le récipient est un gobelet que l'on scelle avec un film de couverture (11).303) thermoforming machine according to claim 2, characterized in that the regulating installation (9) is a pressure limiting valve, adjustable or an adjustable throttling member. 4. Thermoforming machine according to claim 1, characterized in that it comprises a set of sealing devices (3) each having its own piston unit (4), the pressure plant having a pressure chamber. (7) joint connected to each piston units (4). 5) Thermoforming machine according to claim 1, characterized in that the piston unit (4) comprises a cylinder (4c) housed in a guide (5a) with a small clearance (5b). 6) Thermoforming machine according to claim 1, characterized in that 2909583 9 the sealing installation (3) is removably mounted on the heating system (2). 7) Thermoforming machine according to claim 1, characterized in that the gas of the pressure chamber (7) is air or nitrogen. 8) Thermoforming machine according to claim 1, characterized in that it further comprises a displacement unit (12) for pushing a container (10) to be sealed and a cover film (11) from below against the sealing installation (3). 9) Thermoforming machine according to claim 1, characterized in that the piston unit (4) comprises a first piston surface (4a) and a second piston surface (4b), the first piston surface (4a) being in contact with the gas of the pressure chamber (7) and the second piston surface (4b) limiting the movement of the piston unit (4) by a stop (15). 10) Thermoforming machine according to claim 1, characterized in that the sealing device (3) is annular or flat and the container is a cup which is sealed with a cover film (11).
FR0758670A 2006-11-03 2007-10-30 THERMOFORMING MACHINE Active FR2909583B1 (en)

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CN104191598B (en) * 2014-08-26 2016-05-18 广东金兴机械有限公司 A kind of thermoforming machine
EP3006350A1 (en) * 2014-10-09 2016-04-13 Nazzareno Mondini Heat sealing die with sealing pressure adjustment
CN108116722B (en) * 2017-12-20 2020-03-27 安徽燕之坊食品有限公司 Sealing device for food package and capable of being manually rotated and pressed downwards
CN108146729B (en) * 2017-12-20 2019-12-31 阜阳健诺生物科技有限公司 Hydraulic drive pushes down closing device for food package

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