EP0568534A1 - Procede et appareil de thermoscellage - Google Patents

Procede et appareil de thermoscellage

Info

Publication number
EP0568534A1
EP0568534A1 EP91920353A EP91920353A EP0568534A1 EP 0568534 A1 EP0568534 A1 EP 0568534A1 EP 91920353 A EP91920353 A EP 91920353A EP 91920353 A EP91920353 A EP 91920353A EP 0568534 A1 EP0568534 A1 EP 0568534A1
Authority
EP
European Patent Office
Prior art keywords
sealing
housing
sealing element
film
seal
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Withdrawn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
EP91920353A
Other languages
German (de)
English (en)
Other versions
EP0568534A4 (en
Inventor
Martin Siegel
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.)
Weldotron of Delaware Inc
Original Assignee
Weldotron of Delaware 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 Weldotron of Delaware Inc filed Critical Weldotron of Delaware Inc
Publication of EP0568534A1 publication Critical patent/EP0568534A1/fr
Publication of EP0568534A4 publication Critical patent/EP0568534A4/en
Withdrawn legal-status Critical Current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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • B29C66/8742—Safety measures or devices for operators
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B29C65/7461—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool for making welds and cuts of other than simple rectilinear form
    • 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
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • 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
    • B29C66/343—Making tension-free or wrinkle-free joints
    • B29C66/3432—Making tension-free or wrinkle-free joints by holding the material loose or tension-free during joining
    • 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
    • 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
    • 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
    • B29C66/81457—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 block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B29C66/82421—Pneumatic or hydraulic drives using an inflatable element positioned between the joining tool and a backing-up part
    • 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
    • B29C66/8244—Actuating mechanisms magnetically driven
    • 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
    • B29C66/8324—Joining or pressing tools pivoting around 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
    • B29C66/849—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
    • B29C66/80—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
    • B29C66/81415—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 bevelled

Definitions

  • the present invention relates to the art of packaging devices, and more particularly to L- sealers, hermetic sealers and the operation thereof.
  • L-frame sealing and packaging devices are used to wrap objects with a film and to seal and sever the film around the object to make a completely enclosed package.
  • L-sealers are used to wrap objects with a film and to seal and sever the film around the object to make a completely enclosed package.
  • an object to be wrapped is first placed between the layers of a folded strip of commercially available shrink film.
  • the object with its attendant film is then advanced into a sealing area of the machine.
  • Upper and lower L-shaped seal bars are situated in the sealing area, such that when the upper seal bar is lowered onto the lower seal bar, an L-shaped seal is formed between the two layers of film and the film is severed along the seal.
  • the front longitudinal seal and the cross seal at the trailing end of the package formed by the L- shaped seal bars are sufficient to completely seal the package; the front side of the package already is sealed because of the rear cross seal from the previous package, and the film is folded around the back of the package.
  • the upper seal bar is raised, and the newly packaged object is moved off the sealing area for further processing, often involving a heat tunnel which shrinks the film around the object.
  • the sealing area is then ready for another package. Any one of the preceding steps, or all of them, may be either manual or automatic.
  • the seal itself is made by a heated sealing element, mounted in one of the seal bars, which presses the film layers against a seal bed, mounted in the other seal bar, for a predetermined period of time.
  • the sealing element also severs the film along the seal. In heat sealing, the sealing element is hot during the entire time it is pressed against the seal bed, whereas in impulse sealing, the sealing element is heated and cooled while it is pressed against the seal bed.
  • the sealing element is typically a thermal electrode consisting of a metal wire or blade.
  • a longstanding problem in L-sealers is non- uniformity of pressure along the seal, caused by misalignment of the upper seal bar against the lower, or warpage of either seal bar as a result of the high temperature and pressure used in sealing.
  • the upper seal bar is typically mounted on a U-shaped member whose free ends pivot on the back of the sealing machine. The free ends can be adjusted up or down to align the upper seal bar. Such adjustments are delicate and difficult to make precisely, and even if done right, over time adjustments will again need to be made. In addition, such adjustments will not compensate for warpage of the seal bars.
  • a second problem with L-sealer ⁇ is operator safety.
  • the pressure used to make a good seal is typically high, in order to allow relatively low operating temperatures, thereby avoiding fumes produced from burning the film. Therefore, in many prior art devices, the upper seal bar comes down with great force, endangering the operator who inadvertently has his hand or arm in the way. This problem has been addressed by installing sensors or limit switches in the machine, which are not always reliable and which sometimes do not arrest movement of the upper bar until after it has hit the operator.
  • a sealing technique for sealing a plastic film through the application of heat and pressure, employs a sealing assembly, having a sealing element thereon, adapted for generally vertical movement within a housing and a linearly disposed pneumatic source operatively connected to the sealing assembly along substantially the entire length of the sealing assembly, for imparting the vertical movement to the assembly upon actuation of the pneumatic source.
  • An abutting surface is provided and adapted to provide a reactive force against the vertical movement of the sealing assembly, and a source of heat for the sealing element is also provided.
  • a sealing technique for sealing plastic film through the application of heat and pressure, employs a sealing element disposed with a recess in a first housing and adapted for generally vertical movement relative to the first housing, and an abutting surface protruding from a second housing and adapted for generally vertical movement relative to the second housing.
  • a first pair of clamping surfaces is provided on the first housing on either side of the recess, and a second pair of clamping surfaces is provided on the second housing on either side of the abutting surface.
  • Means are provided for moving the first and second housings into an abutting relation ⁇ ship, such that when a plastic film is placed between the first and second housings, the abutting surface pulls the film into the recess and the first and second pairs of clamping surfaces clamp the film on either side of the recess, when the first and second housings are moved into abutting relationship, such that slack is created in the film when the vertical movement is effected by the sealing element and abutting surface.
  • a sealing technique employs a first housing, a seal bed in the first housing, and a device for biasing the seal bed outwardly from the first housing to cause it to protrude therefrom.
  • a second housing adapted to come into substantial contact with the first housing, has a sealing element recessed within it. The first and second housings' are locked together and the sealing element is moved in a direction leading out of the second housing, whereby the sealing element is pressed against the seal bed.
  • the sealing element is segmented to thereby allow uniform pressure despite any warpage or misalignment that may occur.
  • a hermetic sealing technique employs pairs of opposed nichrome ribbons on either side of a cutting element, or a single pair of nichrome ribbons on either side of the cutting element, to effect hermetic sealing of plastic film, in connection with the above described sealing techniques.
  • FIG. 1 is a perspective view of an example of a sealing apparatus according to the present invention.
  • FIG. 2 is a side view along line 2-2 in FIG. 1.
  • FIG. 3 is a cross sectional view of the upper and lower seal bars of the sealing apparatus of FIG. 1.
  • FIG. 4 is a cross sectional view of the upper and lower seal bars of FIG. 3, with the bars in sealing (closed) position.
  • FIG. 5 is a cross sectional view of the upper and lower seal bars of FIG. 3, with the actuator activated.
  • FIG. 6 is a partial perspective view of the upper seal bar of the sealing apparatus of FIG. 1.
  • FIG. 7 is a partial perspective view of the lower seal bar of the sealing apparatus of FIG. 1.
  • FIG. 8 is a partial cross sectional view of the upper and lower seal bars in a hermetic sealing embodiment of the invention.
  • Fig. 1 depicts a semi-automatic sealing machine 10, supported by legs 12, and divided into a tabular packaging area 14 on the right and a tabular sealing area 16 on the left, as viewed by an operator standing in front of the machine.
  • a film dispenser 18 is affixed to the rear of the packaging area 14, and is used to dispense a roll of pre-folded film 20.
  • the film 20 is oriented such that its fold is to the right as it approaches the packaging area 14.
  • a surface plate 22 is situated on the packaging area 14 directly in front of the dispenser 18, and between the upper and lower tri ⁇ angular prongs 24 and 26 of a film forming plow 28. The film forming plow 28 positions the film
  • a crank 25 is disposed on the front of packaging area 14 to adjust the area 14 forward or back to compensate for package size.
  • a U-shaped member 32 is mounted at its free ends 34 at the rear of the sealing area 16 on a pivot bar 36, Fig. 2, which in turn is pivotally secured at its ends to machine 10.
  • An upper L-shaped seal bar 38 formed from a right side cross member 40 and a front longitudinal member 42, is mounted on the front and right side of the U-shaped member 32 by a support beam mounted on the member 32 and fitted into a slot 44 in the upper seal bar 38 (Fig. 3) .
  • the front longitudinal member 42 abuts the right side cross member 40 at a point 41 behind the front end of the cross member 40, creating a protrusion 43.
  • the left side of the member 32 is curved up and away from the sealing area 16 so that it will not contact the surface of the latter when the upper seal bar 38 is in lowered sealing position.
  • Two metal magnet mates 46 protrude from the front of the member 32.
  • a lower L-shaped seal bar 48 formed of a right side cross member 50 and a front longitudinal member 52, is mounted on the surface of the sealing area 16 by a support beam mounted on the sealing area 16 and fitted into a slot 54 in the lower seal bar 48 (Fig. 3) .
  • the front longitudinal member 52 abuts the right side cross member 50 at a point 51 behind the front end of the cross member 50, creating a protrusion 53.
  • the lower seal bar 48 comes into substantially direct, continuous, and uniform contact with the upper seal bar 38 when the latter is in sealing position.
  • Two electromagnets 56 are situated in front of the lower seal bar 48 in order to come into contact with the magnet mates 46 and lock the upper and lower seal bars 38 and 48 together when the upper seal bar 38 is in sealing position.
  • Other locking means can readily be used, as will be apparent to those skilled in the art.
  • a height-adjustable outfeed conveyor 58 adjusted by a crank 55 at the front of the sealing area 16, is situated on the sealing area 16 to remove newly sealed packages to the next stage of processing.
  • Two buttons 60 are mounted in front of the sealing area 16 for initiation of sealing action.
  • a lever 57 is located at the front the of sealing area 16 to adjust the height of the U- shaped member 32, as will be described below.
  • a control panel 62 is placed at eye level above the sealing area 16 for easy viewing, which is used, e.g., to select impulse or heat sealing, temperature of the sealing element, length of seal time, and to select and display package count and other information, in a well known manner.
  • a pneumatic cylinder 64 is secured to a support beam 66 on a bracket 65 at the rear and below the surface of the sealing area 16. The position of the bracket 65 may be horizontally adjusted along beam 66 to change the maximum height at which the member 32 will stop when in a fully raised position, to allow for larger or smaller objects to be packaged.
  • Fig. 2 also shows a rear protrusion 74 from the U-shaped member 32, which is located so as to trigger a limit switch 76 when the member 32 is fully lowered into sealing position.
  • the upper seal bar 38 comprises a seal bed housing 78 substantially inverted U-shaped in cross section, and a seal bed assembly, indicated generally at 80, located in the housing 78, and adapted for vertical movement within the housing 78.
  • the lower ends of the housing 78 have an inwardly larger cross section to form abutments 82.
  • the cross section of the bottom most portions of the lower ends of the housing 78 are further increased inwardly, as shown at 84, and the lower tip of the assembly 80 is tapered to complement the smaller opening of the housing 78.
  • Rubber grippers 94 are mounted on the lower tips of the housing 78.
  • a stopping block 86 is situated at the top of the inside of the housing 78, with uniformly spaced springs 88 reces ⁇ ively mounted on the stopping block 86, between the stopping block 86 and the seal bed assembly 80.
  • the seal bed assembly 80 has a wider cross section at its upper end to form shoulders 90, which are urged into contact with the abutments 82 by the springs 88.
  • a seal bed 92 is mounted at the lower tip of the assembly 80, and protrudes out of the housing 78.
  • the seal bed 92 preferably comprises a dovetail shaped fiberglass substrate 93, a layer of silicon rubber 95, preferably on the order of
  • teflon tape 97 helps release the seal bed 92 after the sealing of sticky film, and the silicon rubber layer 95 contours the seal bed around irregularities.
  • Other combinations of material may be used, as will be apparent to those skilled in the art.
  • Lower seal bar 48 comprises a sealing element housing 96 substantially U-shaped in cross section, and a segmented sealing element assembly, indicated generally at 98, located inside the housing 96.
  • the housings 78 and 96 are constructed with substantially identical cross sections, and the assemblies 80 and 98 are constructed with substantially identical cross ' sections, to facilitate interchangeability of parts, but other configurations can be used, as will be appreciated by those skilled in the art in view of this discussion.
  • the sealing element housing 96 has abutments 100, a narrowed opening 102, and grippers 104, intended to engage the grippers 94 when " in sealing position.
  • the assembly 98 has shoulders 106, a tapered upper end, and is adapted for vertical movement within the housing 96.
  • the assembly 98 is segmented as further detailed below.
  • a continuous mylar tape 101 is secured to the bottom of assembly 98.
  • a pneumatic 5 lifter 108 is situated at the bottom of the housing 96, between the housing 96 and mylar tape 101.
  • the pneumatic lifter 108 can be of the "Pneuma-Seal" type manufactured by Presray Corporation of Pawling, New York. Other types of
  • actuators e.g., electrical or mechanical lifters, also may be used.
  • the assemblies 80 and 98 also contain cooling passages 110 and 112, respectively, through which gas or liquid can be run.
  • cooling passages 110 and 112 respectively, through which gas or liquid can be run.
  • cooling fluid only needs to be run in the passage 112 of assembly 98, but it can also be run through the passage 110 if desired. Also, fine channels 114 can be drilled or otherwise formed between the outer surface of the assembly
  • a segmented sealing element mount 116 is mounted at the upper tip of the assembly 98.
  • 25 element mount 116 is preferably made of teflon coated ceramic, but fiberglass or other suitable material could be used. Like the assembly 88, the mount 116 is segmented, as detailed below. A sealing element 118 is mounted in the
  • the sealing element 118 is preferably a narrow nichrome sealing blade, on the order of 1/8 inch in width and 10-20 thousandths of an inch thick, a thickness of 18 thousandths of an inch having been found to work satisfactorily.
  • the edge of the blade meeting the film may be shaped to a sharp edge, or otherwise, to make microfine seals in a particular film.
  • a nichrome wire or other sealing element could also be used.
  • the seal bed 92 protrudes outwardly from the bottom tip of the housing 78 as a result of the downward force imparted to the assembly 80 by the springs 88.
  • the sealing element 118, on assembly 98 is recessed within the gap between the upper ends of the U-shaped housing 96, since the pneumatic lifter 108 is normally in its deflated condition.
  • the size of the gap between the upper ends of the U-shaped housing 96 is such that the operator's fingers or hands will not contact the sealing element 118, which may be hot, even if the operator accidentally places his hand on the lower seal bar 48.
  • the element housing 96 and bed housing 78, as well as the element assembly 98 and bed assembly 80, are of identical construction in cross section to decrease the cost of manufacturing. Additionally, each of the housings 96 and 78, assemblies 98 and 80, stopping block 86, seal bed 92, pneumatic lifter 108, element mount 116, and grippers 94 and 104, may be economically manufactured by extrusion techniques, as can be seen by the perspective views of the upper seal bar 38 in Fig. 6 and the lower seal bar 48 in Fig. 7. As shown in Fig. 7, the sealing element assembly 98 and mount 116 are divided into segments, indicated generally at 99, each approximately one inch in length and closely fitted together.
  • the segments 99 allow the assembly 98 and mount 116 to compensate for misalignment or warpage in the seal bars by contouring to any irregularity.
  • the seal bed assembly 80 can also be segmented, if desired.
  • the construction of the upper and lower seal bars 38 and 48 has been described above with reference to the cross section views of Fig. 3. As shown in Fig. 1, to make a complete upper L- shaped seal bar 38, two extrusion-manufactured bed housings 78 and seal bed assemblies 80 will be used, one for the right side cross member 40, and one for the front longitudinal member 42. A section of the cross member 40, including the housing 78 and assembly 80, is cut away at 41 so that the seal bed of the front member 42 smoothly abuts the seal bed of the cross member 40, making the seal bed 92 continuous throughout the upper seal bar 38.
  • the lower seal bar 48 is constructed in a similar fashion.
  • a section of the right cross member 50, including the housing 96, assembly 98, and element mount 116, is cut away at point 51.
  • the sealing element 118 of the front member 52 makes a right angle turn at 51 and runs alongside the sealing element 118 of the cross member 50 into the protrusion 53, at the end of which the sealing elements 118 terminate.
  • the protrusions 43 and 53 also sever scrap film.
  • the front member 52 and cross member 50 of the lower seal bar 48 each contain a separate pneumatic lifter 108.
  • a tube 71 leads from the pneumatic source 72 into each pneumatic lifter 108.
  • the pneumatic source 72 pressurizes and expands the pneumatic lifters 108 upon activation, the level of pressurization being regulated by the adjustable valves 73.
  • the vertical displacement of the assembly 98 should be such that the pneumatic lifters 108 do not expand to their maximum extent when inflated by the pneumatic source 72.
  • the pneumatic source 72 will ordinarily be a source of pressurized gas, such as air, a liquid can also be used if desired, and it is intended that the term "pneumatic source” as used herein cover both gas and liquid pressurization techniques.
  • pressurized gas such as air
  • a liquid can also be used if desired, and it is intended that the term "pneumatic source” as used herein cover both gas and liquid pressurization techniques.
  • the operator places an object to be packaged on the surface plate 22, between the top and bottom layers of the film 20, and moves the object and surrounding film into the sealing area 16 and situates it so that the L- shaped seal will be made in the desired place.
  • the leading edge of the film 20 is already sealed by previous sealing action.
  • sealing element 118 is recessed into the lower seal bar 48, and the gap between the edges of the element housing 96 is small relative to the operator's fingers and hands, as mentioned above, even if the operator touches the lower seal bar 48 during manipulation of the package, he is unlikely to touch the sealing element 118 and be burned by it.
  • the cylinder 64 is activated, which pushes the piston 68 and bracket 70 up, rotating the pivot bar 36 and lowering the U-shaped member 32.
  • the cylinder 64 uses only enough pressure to lower the member 32 reasonably quickly, and is not used to provide sealing pressure. The member 32 thus is not likely to injure the operator if his hand or arm is in the way. If the limit switch 76 is not triggered within a specified time, i.e., if the member 32 has been obstructed before reaching sealing position, the cylinder 64 will discontinue lowering the member 32, in a well known manner, and return it to its original position.
  • the limit switch 76 is triggered by the rear protrusion 74, activating the electromagnets 56.
  • the electromagnets 56 then lock the magnet mates 46 into position, locking the upper and lower seal bars 38 and 48 together.
  • the protruding seal bed 92 causes the film 20 to be pulled into the sealing area between the edges of the housings 78 and 96, as indicated by the inwardly directed arrows.
  • the grippers 94 and 104 abut one another and grip the film 20 between them.
  • the pneumatic source 72 is then activated, and supplies air or other fluid at a selected pressure to the pneumatic lifters 108, through the tubes 71.
  • the pneumatic lifters 108 expand, pushing up the assembly 98, which in turn causes the sealing element 118 to press the film 20 against the seal bed 92.
  • the assembly 80 Under this pressure, the assembly 80 is forced upwardly, compressing the springs 88 into their recess in the stopping block 86, until the assembly 80 abuts against the stopping block 86.
  • the retreat of the protruding seal bed 92 causes the excess film brought into the sealing area to create slack in the film 20, thus ensuring that there will be no tension in the film during sealing.
  • the sealing element 118 then seals the film 20 under heat and pressure.
  • segmented sealing element assembly 98 will compensate for any misalignment or warpage in the upper or lower seal bars 38 and 48, by conforming itself to any irregularity.
  • the pressure exerted by the pneumatic lifter 108 will be uniform even while expanding more in some areas than in others, since gas in a single container exerts the same pressure at every point of the container.
  • the pneumatic source 72 is deactivated, causing the pneumatic lifters 108 to deflate and return to their original size. This action causes the assembly 98 to lower, releasing the pressure on the seal bed 92 by the sealing element 118.
  • the seal bed 92 returns to its original position under force of the springs 88.
  • the electromagnets 56 are then deactivated, and member 32 is returned to its original elevated position by compression of the cylinder 64, lowering the piston 68 and bracket 70, and rotating the pivot bar 36.
  • the outfeed conveyor 58 is then activated, which removes the newly sealed package from the sealing area 16. At this point, the sealing area 16 is ready to seal another package.
  • the present invention also includes a hermetic sealing embodiment as shown in Fig. 8.
  • upper and lower seal bars 210 and 212 are similar in construction to the upper and. lower seal bars 38 and 48 in Figs. 1-7, except for the addition of nichrome ribbons 214 and 216, placed on the seal bed 220 and on the tip of the sealing element assembly 221, respectively, on opposite sides of a cutting element 218 which is mounted on the tip of the sealing element assembly 221.
  • This construction carries out hermetic sealing through the abutment of the nichrome ribbons 214 and 216 when the upper and lower seal bars 210 and 212 are in sealing position. In such position, the nichrome ribbons 214 and 216 are heated and effect sealing on either side of the cutting element 218.
  • the cutting element 218 is preferably a blade which merely severs the film against the seal bed 220.
  • the nichrome ribbons may be used only on the sealing element assembly 221, or only on the seal bed 220, but faster sealing will be achieved when the nichrome ribbons are used on both assembly 221 and bed 220.
  • the present invention can be employed in other sealing apparatuses as well.
  • the springs 88 may be any type of resilient means, such as a pneumatic lifter similar to the pneumatic lifter 108.
  • the sealing element and its adjacent components may be placed in the upper seal bar, while placing the seal bed and its adjacent components in the lower seal bar. If operator safety is not a concern, e.g., in fully automatic machines, film tension could be relieved by causing the sealing element to protrude and recessing the seal bed, and by placing the pneumatic lifter whereby it moves the seal bed instead of the sealing element.
  • Other embodiments and variations of the invention will be apparent to those skilled in the art.

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

Abstract

L'invention se rapporte à un appareil de thermoscellage en forme de L (10), qui sert à sceller des films thermoplastiques (20) et qui comporte des barres de scellement supérieure et inférieure (38, 48). Un socle de scellement saillant (92) est monté sur la barre supérieure (38) à l'aide de ressorts (88). La barre inférieure (48) comporte un élément scellant (116) monté sur un ensemble de scellement segmenté (98) et logé dans un évidement de la barre inférieure (48), un dispositif de levage penumatique (108) étant disposé sous l'ensemble scellant (98). Lors de l'utilisation, la barre de scellement supérieure (38) s'abaisse sur la barre de scellement inférieure (48) et les deux barres de scellement se bloquent alors l'une contre l'autre, en serrant ainsi entre elles le film à thermosceller. Le dispositif de levage pneumatique (108) se gonfle ensuite d'air et soulève l'ensemble de scellement (98), lequel s'adapte alors aux contours des gauchissements et autres mauvais alignements éventuels des barres de scellement (38, 48), en pressant l'élément scellant (116) contre le socle de scellement (92) et en poussant celui-ci vers l'arrière dans la barre de scellement supérieure (38). Une fois le thermoscellage réalisé par l'action de la chaleur et de la pression, le dispositif de levage pneumatique (108) se dégonfle, abaissant ainsi l'élément scellant (116) et permettant au socle de scellement (92) de retourner dans sa position de départ sous l'action de la force exercée par les ressorts sous-jacents (88). Les barres de scellement (38, 48) se débloquent et la barre de scellement supérieure (38) retourne dans sa position de départ.
EP19910920353 1990-11-09 1991-11-07 Heat sealing method and apparatus Withdrawn EP0568534A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US61213690A 1990-11-09 1990-11-09
US612136 1990-11-09

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EP0568534A4 EP0568534A4 (en) 1993-12-01

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EP (1) EP0568534A4 (fr)
CA (1) CA2095870A1 (fr)
WO (1) WO1992008613A1 (fr)

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US6157668A (en) * 1993-10-28 2000-12-05 Qualcomm Inc. Method and apparatus for reducing the average transmit power of a base station
IT1298822B1 (it) * 1998-03-27 2000-02-02 Interdibipack Spa Macchina confezionatrice di prodotti con film plastico incorporante un sistema di sicurezza contro gli infortuni
ES2724148T3 (es) 2009-11-17 2019-09-06 Seelen As Método para acumular una lámina en un procedimiento de soldadura
GB2566476B (en) * 2017-09-14 2020-01-01 Fokker Aerostructures Bv Conduction welding

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FR1397917A (fr) * 1963-04-12 1965-05-07 Weldotron Corp Appareil et procédé pour la formation de paquets avec une matière d'emballage soudable à chaud
US3287199A (en) * 1963-10-24 1966-11-22 Triangle Package Machinery Co Jaw assembly for container forming and filling machine
DE1903515A1 (de) * 1968-02-19 1969-09-18 Weldotron Corp Verfahren und Vorrichtung zum Herstellen einer eng anliegenden Huelse aus plastischem Film rings um einen Gegenstand
US3553059A (en) * 1968-12-04 1971-01-05 Anderson Bros Mfg Co Heat sealing apparatus
FR2099589A1 (fr) * 1970-07-24 1972-03-17 Fluorodynamics Inc
FR2102967A5 (en) * 1970-08-31 1972-04-07 Holweg Const Mec Heat sealing tool - with rubber backed ceramic fingers to make the hot tape follow weld section variations
GB2033296A (en) * 1978-10-18 1980-05-21 Rovema Gmbh Welding die for packaging machines
WO1986004559A1 (fr) * 1985-02-01 1986-08-14 Baxter Travenol Laboratories, Inc. Procede et dispositif de soudagde d'une pellicule en bandes dans un systeme de formage, remplissage et fermeture etanche d'emballages
EP0344356A1 (fr) * 1988-06-01 1989-12-06 Urban GmbH & Co. Maschinenbau KG Appareil pour le soudage de feuilles en matière plastique

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US2371847A (en) * 1942-12-18 1945-03-20 Chrysler Corp Apparatus and method for bonding composite articles
US3874976A (en) * 1973-02-02 1975-04-01 Computron Inc Gripper jaw assembly
US4650535A (en) * 1985-08-13 1987-03-17 Creative Packaging Machinery, Inc. Apparatus for heat-sealing thermoplastic sheeting
DE3916170A1 (de) * 1989-05-18 1990-11-22 Multivac Haggenmueller Kg Vakuum-kammermaschine

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Publication number Priority date Publication date Assignee Title
FR1397917A (fr) * 1963-04-12 1965-05-07 Weldotron Corp Appareil et procédé pour la formation de paquets avec une matière d'emballage soudable à chaud
US3287199A (en) * 1963-10-24 1966-11-22 Triangle Package Machinery Co Jaw assembly for container forming and filling machine
DE1903515A1 (de) * 1968-02-19 1969-09-18 Weldotron Corp Verfahren und Vorrichtung zum Herstellen einer eng anliegenden Huelse aus plastischem Film rings um einen Gegenstand
US3553059A (en) * 1968-12-04 1971-01-05 Anderson Bros Mfg Co Heat sealing apparatus
FR2099589A1 (fr) * 1970-07-24 1972-03-17 Fluorodynamics Inc
FR2102967A5 (en) * 1970-08-31 1972-04-07 Holweg Const Mec Heat sealing tool - with rubber backed ceramic fingers to make the hot tape follow weld section variations
GB2033296A (en) * 1978-10-18 1980-05-21 Rovema Gmbh Welding die for packaging machines
WO1986004559A1 (fr) * 1985-02-01 1986-08-14 Baxter Travenol Laboratories, Inc. Procede et dispositif de soudagde d'une pellicule en bandes dans un systeme de formage, remplissage et fermeture etanche d'emballages
EP0344356A1 (fr) * 1988-06-01 1989-12-06 Urban GmbH & Co. Maschinenbau KG Appareil pour le soudage de feuilles en matière plastique

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Also Published As

Publication number Publication date
WO1992008613A1 (fr) 1992-05-29
CA2095870A1 (fr) 1992-05-10
EP0568534A4 (en) 1993-12-01

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