WO2001089807A2 - Method and device for leakproof sealing a lid to a container - Google Patents

Method and device for leakproof sealing a lid to a container Download PDF

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Publication number
WO2001089807A2
WO2001089807A2 PCT/PL2001/000042 PL0100042W WO0189807A2 WO 2001089807 A2 WO2001089807 A2 WO 2001089807A2 PL 0100042 W PL0100042 W PL 0100042W WO 0189807 A2 WO0189807 A2 WO 0189807A2
Authority
WO
WIPO (PCT)
Prior art keywords
container
film
edge
ring
lid
Prior art date
Application number
PCT/PL2001/000042
Other languages
French (fr)
Other versions
WO2001089807A3 (en
Inventor
Zbigniew Przybysz
Original Assignee
Zbigniew Przybysz
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 Zbigniew Przybysz filed Critical Zbigniew Przybysz
Publication of WO2001089807A2 publication Critical patent/WO2001089807A2/en
Publication of WO2001089807A3 publication Critical patent/WO2001089807A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/7451—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 the severing tool and the welding tool being movable with respect to one-another
    • 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
    • B29C66/01—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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—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
    • B29C66/50—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
    • B29C66/61—Joining from or joining on the inside
    • B29C66/612—Making circumferential 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
    • B29C66/80—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
    • B29C66/824—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
    • B29C66/8246—Servomechanisms, e.g. servomotors
    • 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
    • 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
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0009—Cutting out
    • 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
    • B29C66/5342—Joining single elements to open ends of tubular or hollow articles or to the ends of bars a substantially flat extra element being placed between and clamped by the joined single elements and the end of said tubular or hollow articles
    • B29C66/53421—Joining single elements to open ends of tubular or hollow articles or to the ends of bars a substantially flat extra element being placed between and clamped by the joined single elements and the end of said tubular or hollow articles said substantially flat extra element being flexible, e.g. a membrane
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies

Definitions

  • the present invention relates to a method of leakproof sealing a lid to a container, particularly plastic bucket, and to a device for leakproof sealing a lid to a container.
  • lids made of metal foil or plastic film of different kinds are used for sealing containers.
  • the lids are also fused to the upper part of the container by pressing the lid with a punch at elevated temperature.
  • the present invention discloses a method of leakproof sealing of container in which the container moves on a conveyor belt and is placed centrally under a sealing head.
  • a plastic film for lids is supplied from a roll and is clamped between two plates with circular holes. The holes define a portion of the film used for producing the lid.
  • the circular portion of the film is heated on a ring- shaped area close to a border of the circular portion of the film.
  • the whole circular portion of the film can be heated.
  • the film is stretched by means of a punch.
  • the stretched film with the punch is then introduced into the opening of the container until the film touches the edge of the container. Then the film and the edge of the container are fused and subsequently the film is cut off outside the sealed container.
  • the film and the container are fused on internal surface of the container close to the edge of the opening.
  • the film used for sealing can be laminated with glue on a surface that is in contact with the container.
  • the container's surface designed for fusing can be laminated with the glue, or both the film and the container can be laminated with the glue.
  • the sealed container can be additionally closed with a cap known in the art.
  • the present invention also discloses a device for leakproof sealing of containers.
  • the device forms one unit with conveyor belt and is equipped with a frame, known control units and a feeder of rolled film.
  • the main unit of the device is a sealing head that comprises a punch, a ring- shaped heater and a circumferential cutter.
  • the sealing head is actuated by means of centrally placed vertical servo.
  • a first holder of the ring-shaped heater and a second holder of the circumferential cutter are mounted to a piston rod of the centrally placed vertical servo.
  • the holders are separated with springs.
  • Two horizontally oriented plates, a top plate and a bottom plate, with ' circular holes are placed under the sealing head.
  • the container is placed under the sealing head.
  • the plates, designed to clamp the film, are mounted on at least two servos.
  • the bottom plate is able to move in relation to the upper plate.
  • the ring-shaped heater has two working surfaces vertically displaced against each other.
  • An inner heating surface of the ring-shaped heater which is displaced down against an outer surface, heats a ring-shaped area of the clamped film.
  • the outer heating surface of the ring-shaped heater fuses the film with an edge of the container.
  • the sealing device can be equipped with additional heater mounted inside the punch or it can be equipped only with a heater that is mounted inside the punch.
  • the circumferential cutter is preferably a mechanical cutter but it can be also a thermal cutter.
  • the plastic containers can be leakproof sealed.
  • the method according to the present invention can be used together with the known method of closing containers with the known cap. This ensures high quality of leakproof sealing and high durability that is necessary during transportation of the containers when they are stored one on another. Additionally applying the lid of dished shape results in removing significant volume of the air from the container. This is important in case of food or chemical products.
  • Fig. 1 is a side view of the device for leakproof sealing of the containers
  • Fig. 2 is a sectional view of the sealing head of the device
  • Fig. 3 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during heating the ring-shaped part of the plastic film;
  • Fig. 4 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during forming the dished portion of the lid;
  • Fig. 5 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during fusing the lid to the edge of the container;
  • Fig. 6 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during fusing the lid to the internal surface of the container;
  • Fig. 7 is a sectional view of the leakproof sealed container additionally closed with a cap.
  • a device is fixed with a conveyor belt 2 to a base 1.
  • Said conveyor belt 2 delivers a container 3 filled mostly with a liquid content to said device.
  • a film feeder 5 is fixed to a spatial frame 4.
  • servos, sensors, time relays, marginal switches and control box are fixed to said spatial frame 4.
  • the basic unit of said device is a sealing head 6 which work is synchronised with said conveyor belt 2 and with said film feeder 5.
  • Said sealing head 6, which is mounted on a central vertical servo 8, comprises a punch 9 and a ring-shaped heater 10 fixed to a first holder 11.
  • Said sealing head 6 also comprises a circumferential cutter 12 fixed to a second holder 14 and springs 13 that are mounted between said first holder 11 and said second holder 14.
  • Said ring-shaped heater 10 has two working surfaces 15 and 16 vertically displaced against each other.
  • a lower surface 15 is for heating a film 7 on a ring- shaped area 17 of a circular area 18 of said film 7. Said heating allows stretching said film 7 and its permanent, deformation.
  • An upper surface 16 is for fusing a peripheral part 19 of said circular area 18 of said film 7 to an edge 20 of said container 3.
  • a lower part of said device comprises two horizontally oriented plates, a top plate 21 and a bottom plate 22.
  • Said top plate 21 is fixed to casings 23 of piston rods 24 of servos 25 and said bottom plate 22 is movable and is fixed to said piston rods 24 of said servos 25. Between said plates 21, 22 said film 7 is moved and supplied by said film feeder 5.
  • Said plates 21, 22 have holes 26, 27 which let said punch 9 and said ring-shaped heater 10, and said circumferential cutter 12 to be moved through said holes 26, 27 towards said container 3 located under said sealing head 6.
  • Said punch 9 and said ring-shaped heater 10, and said circumferential cutter 12 move through said holes 26, 27 during a process of forming a dished lid 28, fusing said dished lid 28 to said edge 20 and cutting off said film 7 outside said container 3.
  • Said circumferential cutter 12 has a serrate cutting edge.
  • said sealing head 6 comprises said circumferential cutter 12 that has thermal cutting edge. Said circumferential cutter 12 with said thermal cutting edge cut off said film 7 outside said edge 20 of said container 3. Said sealing head 6 additionally can be equipped with a heater mounted inside said punch 9, or the only heater can be said heater inside said punch 9. When the only heater is said heater inside said punch 9 said dished lid 28 is fused with a weld 29 to an internal surface of said container 3 close to said edge 20.
  • said conveyor belt moves said container 3 and positions it centrally, with help of known sensors, under said sealing head 6.
  • Said bottom plate 22 moves up and clamps said film 7 between said bottom plate 22 and said top plate 21.
  • said ring-shaped heater 10 is turned on and heats said ring-shaped area 17 of said circular area 18 of said film 7.
  • said punch 9 moves down and stretches said film 7 on said heated ring-shaped area 17 and forms said dished lid 28.
  • Plates 21, 22 with clamped film 7, ring-shaped heater 10 and moved forward punch 9 moves toward said container 3.
  • Said peripheral part 19 of said circular area 18 of said film 7 is pressed against said edge 20 of said container 3 by means of said upper surface 16 of said ring-shaped heater 10.
  • Said upper surface 16 fuses said peripheral part 19 to said edge 20.
  • Said circumferential cutter 12 moves down and cuts off said film 7 outside said edge 20 of said container 3.
  • Said sealing head 6 together with said bottom plate 22 and said top plate 21 moves up, said film feeder 5 moves said film 7 and said device is prepared for leakproof sealing of the next container 3.
  • said container 3 is additionally closed with a known cap 31.

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

Abstract

A method in which a film (7) is fed from a roll, and is clamped between plates (21, 22) of a device. Said film (7) is then heated and stretched to form a dished lid (28). Said lid is introduced to an opening of a container (3) and fused to an edge (20) of said container and then is cut off outside said edge (20) of said container (3). A device co-operating with conveyor belt (2) that delivers said containers (3) comprises a sealing head (6) synchronised with a film feeder (5). Said sealing head is mounted on a central vertical servo (8) and comprises a punch (9), a ring-shaped heater (10) and a circumferential cutter (12). Said device is also equipped with plates (21, 22) fixed to servos (25). Said plates (21, 22) have holes (26, 27).

Description

Method of leakproof sealing a lid to a container and device for leakproof sealing a lid to a container
Technical field
The present invention relates to a method of leakproof sealing a lid to a container, particularly plastic bucket, and to a device for leakproof sealing a lid to a container.
Background of the invention
There is known method of sealing plastic containers as described in US patent specification no. 4888935. In this method a container is closed with a dished foil lid made of heat conductive material, preferably metal. Previously prepared dished lid is placed over the top of the container with the dished portion of the lid extending downwardly into the plastic container. The periphery of the lid is in contact with the flange of the container. The lid is fused to the container by pressing a heating tool with tapered tip at elevated temperature. By applying temperature and pressure the inner edge of the container is melted and fused to the lid.
In other methods lids made of metal foil or plastic film of different kinds are used for sealing containers. In these methods the lids are also fused to the upper part of the container by pressing the lid with a punch at elevated temperature.
Summary of the invention The present invention discloses a method of leakproof sealing of container in which the container moves on a conveyor belt and is placed centrally under a sealing head. A plastic film for lids is supplied from a roll and is clamped between two plates with circular holes. The holes define a portion of the film used for producing the lid.
The circular portion of the film is heated on a ring- shaped area close to a border of the circular portion of the film. Alternatively the whole circular portion of the film can be heated.
In the next step the film is stretched by means of a punch. The stretched film with the punch is then introduced into the opening of the container until the film touches the edge of the container. Then the film and the edge of the container are fused and subsequently the film is cut off outside the sealed container.
In another embodiment the film and the container are fused on internal surface of the container close to the edge of the opening.
The film used for sealing can be laminated with glue on a surface that is in contact with the container. Also the container's surface designed for fusing can be laminated with the glue, or both the film and the container can be laminated with the glue.
If it is required the sealed container can be additionally closed with a cap known in the art.
The present invention also discloses a device for leakproof sealing of containers. The device forms one unit with conveyor belt and is equipped with a frame, known control units and a feeder of rolled film. The main unit of the device is a sealing head that comprises a punch, a ring- shaped heater and a circumferential cutter. The sealing head is actuated by means of centrally placed vertical servo. A first holder of the ring-shaped heater and a second holder of the circumferential cutter are mounted to a piston rod of the centrally placed vertical servo. The holders are separated with springs. Two horizontally oriented plates, a top plate and a bottom plate, with' circular holes are placed under the sealing head. Dimensions of the holes are big enough to let the punch, the ring-shaped heater and the circumferential cutter to be moved through the holes towards the container. The container is placed under the sealing head. The plates, designed to clamp the film, are mounted on at least two servos. The bottom plate is able to move in relation to the upper plate. The ring-shaped heater has two working surfaces vertically displaced against each other. An inner heating surface of the ring-shaped heater, which is displaced down against an outer surface, heats a ring-shaped area of the clamped film. The outer heating surface of the ring-shaped heater fuses the film with an edge of the container. Alternatively the sealing device can be equipped with additional heater mounted inside the punch or it can be equipped only with a heater that is mounted inside the punch.
The circumferential cutter is preferably a mechanical cutter but it can be also a thermal cutter.
By applying the method and the device according to the present invention the plastic containers, particularly buckets filed with liquid medium, can be leakproof sealed. The method according to the present invention can be used together with the known method of closing containers with the known cap. This ensures high quality of leakproof sealing and high durability that is necessary during transportation of the containers when they are stored one on another. Additionally applying the lid of dished shape results in removing significant volume of the air from the container. This is important in case of food or chemical products. Brief description of the drawings
Fig. 1 is a side view of the device for leakproof sealing of the containers;
Fig. 2 is a sectional view of the sealing head of the device; Fig. 3 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during heating the ring-shaped part of the plastic film;
Fig. 4 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during forming the dished portion of the lid;
Fig. 5 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during fusing the lid to the edge of the container;
Fig. 6 is a schematic presentation, in a sectional view, of setting of the sealing head' s elements during fusing the lid to the internal surface of the container; and
Fig. 7 is a sectional view of the leakproof sealed container additionally closed with a cap.
Detailed description of the preferred embodiment
A device according to the present invention is fixed with a conveyor belt 2 to a base 1. Said conveyor belt 2 delivers a container 3 filled mostly with a liquid content to said device. A film feeder 5 is fixed to a spatial frame 4. Also servos, sensors, time relays, marginal switches and control box are fixed to said spatial frame 4. The basic unit of said device is a sealing head 6 which work is synchronised with said conveyor belt 2 and with said film feeder 5. Said sealing head 6, which is mounted on a central vertical servo 8, comprises a punch 9 and a ring-shaped heater 10 fixed to a first holder 11. Said sealing head 6 also comprises a circumferential cutter 12 fixed to a second holder 14 and springs 13 that are mounted between said first holder 11 and said second holder 14. Said ring-shaped heater 10 has two working surfaces 15 and 16 vertically displaced against each other. A lower surface 15 is for heating a film 7 on a ring- shaped area 17 of a circular area 18 of said film 7. Said heating allows stretching said film 7 and its permanent, deformation. An upper surface 16 is for fusing a peripheral part 19 of said circular area 18 of said film 7 to an edge 20 of said container 3. A lower part of said device comprises two horizontally oriented plates, a top plate 21 and a bottom plate 22. Said top plate 21 is fixed to casings 23 of piston rods 24 of servos 25 and said bottom plate 22 is movable and is fixed to said piston rods 24 of said servos 25. Between said plates 21, 22 said film 7 is moved and supplied by said film feeder 5. Said plates 21, 22 have holes 26, 27 which let said punch 9 and said ring-shaped heater 10, and said circumferential cutter 12 to be moved through said holes 26, 27 towards said container 3 located under said sealing head 6. Said punch 9 and said ring-shaped heater 10, and said circumferential cutter 12 move through said holes 26, 27 during a process of forming a dished lid 28, fusing said dished lid 28 to said edge 20 and cutting off said film 7 outside said container 3. Said circumferential cutter 12 has a serrate cutting edge.
In another embodiment of the present invention said sealing head 6 comprises said circumferential cutter 12 that has thermal cutting edge. Said circumferential cutter 12 with said thermal cutting edge cut off said film 7 outside said edge 20 of said container 3. Said sealing head 6 additionally can be equipped with a heater mounted inside said punch 9, or the only heater can be said heater inside said punch 9. When the only heater is said heater inside said punch 9 said dished lid 28 is fused with a weld 29 to an internal surface of said container 3 close to said edge 20. During work of said device said conveyor belt moves said container 3 and positions it centrally, with help of known sensors, under said sealing head 6. Said bottom plate 22 moves up and clamps said film 7 between said bottom plate 22 and said top plate 21. Then said ring-shaped heater 10 is turned on and heats said ring-shaped area 17 of said circular area 18 of said film 7. In the next step said punch 9 moves down and stretches said film 7 on said heated ring-shaped area 17 and forms said dished lid 28. Plates 21, 22 with clamped film 7, ring-shaped heater 10 and moved forward punch 9 moves toward said container 3. Said peripheral part 19 of said circular area 18 of said film 7 is pressed against said edge 20 of said container 3 by means of said upper surface 16 of said ring-shaped heater 10. Said upper surface 16 fuses said peripheral part 19 to said edge 20. Said circumferential cutter 12 moves down and cuts off said film 7 outside said edge 20 of said container 3. Said sealing head 6 together with said bottom plate 22 and said top plate 21 moves up, said film feeder 5 moves said film 7 and said device is prepared for leakproof sealing of the next container 3.
Additionally after leakproof sealing of said container 3 with said dished lid 28 made of said film 7, said container 3 is additionally closed with a known cap 31.

Claims

Claims
1. A method of leakproof sealing a lid to a container, particularly a plastic bucket, which is moved on a conveyor belt and positioned centrally under a sealing head of a device for leakproof sealing of containers, characterised in that a dished lid (28) for closing said container (3) is made of a film (7) when said film (7) is clamped between a top plate (21) and a bottom plate (22) of said device and a circular area (18) of said film (7) is heated and afterwards said film (7) is stretched by means of a punch (9) to form said dished lid (28) , and said dished lid (28) is introduced into an opening of said container (3) and a peripheral part (19) of said circular area (18) is pressed against an edge (20) of said container (3) and said peripheral part (19) is then fused to said edge (20) ; afterwards said film (7) is cut off outside of said edge (20) of said container (3) .
2. A method according to claim 1, characterised in that said dished lid (28) is made of film from a roll and on said circular area (18) only a ring-shaped area (17) is heated.
3. A method according to claim 1 or 2 characterised in that a surface of said film (7) that is in contact with said container (3) is laminated with glue.
4. A method according to claim 1 or 2 characterised in that said edge (20) of said container (3) is laminated with glue.
5. A method according to claim 1 or 2 characterised in that a surface of said film (7) that is in contact with said container (3) as well as said edge (20) of said container (3) are laminated. with glue.
A method according to claim 1 or 2, or 3, or 4, or 5 characterised in that a weld (29) between said circular area (18) of said film (7) with said container (3) is made on internal surface of said container (3) close to said edge (20) .
A method according to claim 1 or 2, or 3, or 4, or 5, or 6 characterised in that after leakproof sealing of said container (3) with said dished lid (28) made of said film (7), said container (3) is additionally closed with a cap (31) .
A device for leakproof sealing of a container, particularly plastic bucket, co-operating with a conveyor belt for transportation of said container built on a spatial frame and equipped with servos, sensors, time relays, marginal switches and control box, characterised in that said device is equipped with a sealing head (6) which is synchronised with a film feeder (5) , whereas said sealing head (6) comprises a punch (9), a ring-shaped heater (10), a circumferential cutter (12), whereas a lower part of said device comprises two horizontally oriented plates, a top plate (21) and a bottom plate (22) , and between said plates (21, 22) a film (7) moves while said plates (21, 22) have holes (26, 27) of dimensions which let said punch (9) and said ring-shaped heater (10) , and said circumferential cutter (12) to be moved through said holes (26, 27) towards said container (3) located under said sealing head (6) . A device according to claim 8 characterised in that said sealing head (6) is mounted on a central vertical servo (8) , said ring-shaped heater (10) is fixed to a first holder (11) and said circumferential cutter (12) is fixed to a second holder (14); said second (14) holder is displaceable in relation to said first holder (11) whereas between said holders (11, 14) springs (13) are mounted, and said plates (21, 22) are mounted on servos (25) whereas said top plate (21) is fixed to casings (23) of piston rods (24) of said servos (25) and said bottom plate (22) is fixed to said piston rods (24) of said servos (25) . . A device according to claim 8 characterised in that said ring-shaped heater (10) has two working surfaces (15 and
16) vertically displaced against each other, and a lower surface (15) is for heating the ring-shaped area (17) of said circular area (18) , while an upper surface (16) is for fusing a peripheral part (19) of said circular area (18) of said film (7) to said edge (20) of said container (3) . . A device according to claim 8 characterised in that said circumferential cutter (12) is thermal cutter. . A device according to claim 8 characterised in that said device is additionally equipped with a heater mounted inside said punch (9), or the only heater is said heater inside said punch (9) .
PCT/PL2001/000042 2000-05-23 2001-05-16 Method and device for leakproof sealing a lid to a container WO2001089807A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL340268A PL196554B1 (en) 2000-05-23 2000-05-23 Method of and apparatus for tightly closing containers
PLP.340268 2000-05-23

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WO2001089807A2 true WO2001089807A2 (en) 2001-11-29
WO2001089807A3 WO2001089807A3 (en) 2002-06-20

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010019856A1 (en) * 2010-05-07 2011-11-10 Itec-Ingenieurbüro für Hygiene Und Lebensmitteltechnik GmbH Method for sealing stackable and reusable transport and storage box by sealable protective film, involves laying foil sheet with protruding edges on plastic box
WO2015150661A1 (en) * 2014-04-02 2015-10-08 Sidel Participations Method of plugging a hollow container, plugged container obtained by such a method and use of such a plugged container
US20160152360A1 (en) * 2011-07-07 2016-06-02 Berry Plastics Corporation Lid sealing system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404197A1 (en) * 1974-01-29 1975-07-31 Friedrich Albrecht Prepared lid placing system on container - uses thin lid held against container edge during securing operation
US4888935A (en) * 1988-07-25 1989-12-26 Campbell Soup Company Method for sealing a lid to a container
EP0559290A1 (en) * 1992-03-06 1993-09-08 Shikoku Kakoki Co., Ltd. Apparatus for sealing containers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404197A1 (en) * 1974-01-29 1975-07-31 Friedrich Albrecht Prepared lid placing system on container - uses thin lid held against container edge during securing operation
US4888935A (en) * 1988-07-25 1989-12-26 Campbell Soup Company Method for sealing a lid to a container
EP0559290A1 (en) * 1992-03-06 1993-09-08 Shikoku Kakoki Co., Ltd. Apparatus for sealing containers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010019856A1 (en) * 2010-05-07 2011-11-10 Itec-Ingenieurbüro für Hygiene Und Lebensmitteltechnik GmbH Method for sealing stackable and reusable transport and storage box by sealable protective film, involves laying foil sheet with protruding edges on plastic box
DE102010019856B4 (en) * 2010-05-07 2015-02-19 Itec-Ingenieurbüro für Hygiene Und Lebensmitteltechnik GmbH Method and device for closing a stackable reusable transport and storage box by means of a protective film
US20160152360A1 (en) * 2011-07-07 2016-06-02 Berry Plastics Corporation Lid sealing system
WO2015150661A1 (en) * 2014-04-02 2015-10-08 Sidel Participations Method of plugging a hollow container, plugged container obtained by such a method and use of such a plugged container
FR3019538A1 (en) * 2014-04-02 2015-10-09 Sidel Participations METHOD OF CLOSING A HOLLOW CONTAINER, RECIPIENT MOUTH OBTAINED BY SUCH A METHOD AND USE OF SUCH A MOUTH CONTAINER
US20170121087A1 (en) * 2014-04-02 2017-05-04 Sidel Participations Method of capping a hollow container, capped container obtained by such a method and use of such a capped container

Also Published As

Publication number Publication date
PL196554B1 (en) 2008-01-31
WO2001089807A3 (en) 2002-06-20
PL340268A1 (en) 2001-12-03

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