EP0282563A4 - Vorrichtung zum heissversiegeln von thermoplastblattmaterial zwischen elektroden. - Google Patents

Vorrichtung zum heissversiegeln von thermoplastblattmaterial zwischen elektroden.

Info

Publication number
EP0282563A4
EP0282563A4 EP19870906336 EP87906336A EP0282563A4 EP 0282563 A4 EP0282563 A4 EP 0282563A4 EP 19870906336 EP19870906336 EP 19870906336 EP 87906336 A EP87906336 A EP 87906336A EP 0282563 A4 EP0282563 A4 EP 0282563A4
Authority
EP
European Patent Office
Prior art keywords
electrode
flexible tube
counter
electrodes
sheets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19870906336
Other languages
English (en)
French (fr)
Other versions
EP0282563A1 (de
Inventor
Pierre P Soubrier
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.)
Baxter International Inc
Original Assignee
Baxter Travenol Laboratories Inc
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 Baxter Travenol Laboratories Inc filed Critical Baxter Travenol Laboratories Inc
Publication of EP0282563A1 publication Critical patent/EP0282563A1/de
Publication of EP0282563A4 publication Critical patent/EP0282563A4/de
Withdrawn legal-status Critical Current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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B29C66/00441—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool movable, e.g. mounted on reels
    • 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
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • 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
    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • 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
    • B29C66/81455—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 being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making 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
    • 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
    • B29C65/38—Impulse heating
    • 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
    • B29C65/7858—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 characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7891—Means for handling of moving sheets or webs of discontinuously moving sheets or webs
    • 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
    • B29C66/80—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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/90—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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

Definitions

  • the present invention relates to apparatus for heat sealing sheets of thermoplastic material between two electrodes. It relates more particularly to apparatus that can heat seal sheets composed of, for example, polyethylene or polypropylene, especially for the fabrication of flexible bags or containers holding a perfusion liquid to be administered to a patient intravenously.
  • the apparatus according to the present invention is used for impulse heat sealing sheets of thermoplastic material along a horizontal or vertical line forming the bottom or the lateral wall, respectively, of a flexible bag.
  • thermoplastic material Presently utilized in the art for heat sealing sheets of thermoplastic material is a device comprising an electrode movable with respect to a counter-electrode which can be fixed or movable. Two sheets that are positioned between these two electrodes are to be heat sealed together. The movable electrode then moves to bear upon the counter-electrode, with the two sheets positioned in between, to heat seal the sheets of thermoplastic material to one another at the location where they are pinched between the electrodes. To achieve good impulse heat sealing it is important to cont r ol two parameters: the length of time of the heat sealing procedure and the pressure exerted by the electrodes on the sheets to be heat sealed. In the prior a the heads of the electrodes that came into contact with the sheets of thermoplastic material have a hard surface, so that the pressure between these heads cannot be regulated.
  • An object of the present invention is to provide a heat sealing apparatus that can regulate the pressure exerted by the electrode heads for the duration of each heat sealing cycle, i.e. during the pressing of the sheets between the electrodes, during the heat sealing of the sheets together, and during the crystallization of the heat sealing band.
  • the apparatus for heat sealing sheets of thermoplastic material between two electrodes is characterized by one of the electrodes having a deformable part. The deformation of this part is regulated while the electrodes are in contact with the sheets of thermoplastic material to be heat sealed.
  • the deformable part is included in the counter-electrode, fixed or movable, that cooperates with an electrode that is movable with respect to the counter-electrode.
  • the deformable part of the counter-electrode preferably comprises a flexible tube lodged in a cavity in the counter-electrode head which faces the head of the movable electrode.
  • This flexible tube is connected to a compressed ai source which creates in the flexible tube a controllable pressure that prevents its deformation by the head of the movable electrode.
  • the pressure existing in the flexible tube is, accordingly, a counterpressure to the pressure exerted by the head of the movable electrode on this flexible tube.
  • Another feature of the instant invention is that the flexible tube, only one portion of which protrudes from the head of the counter-electrode, is protected by a strip that is displaceable step by step over the head of the counter-electrode. This protective strip is rolled at each end over a roller and is guided in grooves provided in the counter-electrode.
  • Fig. 1 is a side view of the heat sealing apparatus that is the subject of the instant invention.
  • Fig. 2 is a front view of the counter-electrode.
  • the heat sealing apparatus shown in the drawings comprises a movable electrode 1, a portion of which is shown in Fig. 1. Electrode 1 is moved back and forth in the direction of the arrows X and is positioned adjacent a counter-electrode 2 that is fixed in a support 3. Electrodes 1 and 2 are in the shape of bars, the length of which is approximately equal to the length of the heat seal to be formed between two sheets 4 and 5 of thermoplastic material. Sheets 4 and 5 are intermittently moved along within the apparatus in the direction of the arrow Y.
  • the movable electrode 1 includes a head 6 that is moved into contact with the outer face of the sheet 4 of thermoplastic material, at the location where sheet 4 is to be heat sealed to sheet 5.
  • the counter-electrode 2 includes a head 7 having a longitudinal cavity 8.
  • Cavity 8 houses a flexible tube 9 of rubber, silicone or other similar material. A small portion of the exterior surface of flexible tube 9 protrudes from cavity 8 and faces head 6 of movable electrode 1.
  • flexible tube 9 is connected at each end to a junction 10, one of which is connected to a source of compressed air (not shown).
  • the other junction 10 is connected to a conduit 11 having a gate valve 12 which allows for the regulation of the ai " pressure in the flexible tube 9.
  • a strip 13 of a heat resistance material extends from a roll 14, through guide grooves 15, to the front of head 7 of the counter-electrode. Strip 13 then passes through guide grooves 16 and ends at a roll 17. Strip 13 protects the flexible tube 9 from deterioration caused by heat. Strip 13 may be moved intermittently in the direction of arrows Z. r
  • the heat sealing apparatus described above functions in the following manner.
  • sheets 4 and 5 of polyolefin material for example, have been moved in the direction of arrow Y until that portion of the sheets to be heat sealed together is positioned between electrodes I and 2, the movable electrode 1 is displaced toward the fixed counter-electrode 2.
  • the pressure of compressed air in the flexible tube 9 carried by the counter-electrode 2 is regulated.
  • the pressure in the flexible tube is a counterpressure to the closing pressure exerted by the movable electrode 1 on the counter-electrode 2.
  • the heat sealing apparatus taught by the present invention provides for a uniform pressure between the electrodes 1 and 2 during the welding of sheets 4 and 5, which results in an improved heat seal.
  • the heat sealing apparatus with flexible tube 9, described herein advantageously provides the regulating of the pressure in tube 9 as a function of the heat sealing and crystallization characteristics of the sheets 4 and 5, and as a function of the profile of the heat seal band desired.
  • movable electrode 1 separates from fixed counter-electrode 2 and the air pressure in flexible tube 9 is reduced to a predetermined level. As soon as electrodes 1 and 2 are separated by a sufficientdistance, sheets of thermoplastic material 4 and 5 are displaced in the direction Y to the next position where they are to be heat sealed. The cycle described above is then repeated.
  • protective strip 13 can be moved in the direction of one of the arrows Z, so that a new portion of strip 13 covers flexible tube 9.
  • the control of the intermittent displacement of the protective strip 13 may be either mechanical or manual.
  • the width of strip 13 corresponds to the length of the heat sealing band 18 and may be slightly less than the length of flexible tube 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)
EP19870906336 1986-09-09 1987-09-08 Vorrichtung zum heissversiegeln von thermoplastblattmaterial zwischen elektroden. Withdrawn EP0282563A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/217136A BE905400A (fr) 1986-09-09 1986-09-09 Dispositif de soudage de feuilles en matiere thermoplastique entre deux electrodes.
BE217136 1986-09-09

Publications (2)

Publication Number Publication Date
EP0282563A1 EP0282563A1 (de) 1988-09-21
EP0282563A4 true EP0282563A4 (de) 1989-09-04

Family

ID=3844077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870906336 Withdrawn EP0282563A4 (de) 1986-09-09 1987-09-08 Vorrichtung zum heissversiegeln von thermoplastblattmaterial zwischen elektroden.

Country Status (5)

Country Link
EP (1) EP0282563A4 (de)
JP (1) JPH01500813A (de)
AU (1) AU598600B2 (de)
BE (1) BE905400A (de)
WO (1) WO1988001933A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013030114A1 (de) * 2011-08-30 2013-03-07 Bielomatik Leuze Gmbh + Co. Kg VORRICHTUNG ZUM WÄRMEIMPULSSCHWEIßEN
EP3590345B1 (de) * 2018-07-02 2024-05-15 Albert Handtmann Maschinenfabrik GmbH & Co. KG Verschlussmodul und verfahren zum verschliessen und/oder trennen von gefüllten über einen wurstzopf verbundenen wursthüllen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1164707A (fr) * 1956-01-16 1958-10-14 Perfectionnement au soudage des matières thermo-plastiques par électrodes chauffantes
US2960147A (en) * 1958-04-15 1960-11-15 Us Rubber Co Heat sealing device
US3473995A (en) * 1965-04-19 1969-10-21 Gloucester Eng Co Inc Web altering mechanism
US3524783A (en) * 1968-02-27 1970-08-18 Robinson E S & A Canada Method and apparatus for heat-sealing and cutting thermoplastic films
DE2255762A1 (de) * 1971-11-24 1973-05-30 Elwis Ingf Vorrichtung zum zusammenfuegen von zwei folien unter druck und waerme
US3826702A (en) * 1969-05-13 1974-07-30 H Chapman Method of in-situ heat seal sleeving for large rolls
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Also Published As

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BE905400A (fr) 1987-03-09
AU8031387A (en) 1988-04-07
EP0282563A1 (de) 1988-09-21
AU598600B2 (en) 1990-06-28
WO1988001933A1 (en) 1988-03-24
JPH01500813A (ja) 1989-03-23

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