US3604615A - Sealed packaging unit with tear string - Google Patents

Sealed packaging unit with tear string Download PDF

Info

Publication number
US3604615A
US3604615A US779547A US3604615DA US3604615A US 3604615 A US3604615 A US 3604615A US 779547 A US779547 A US 779547A US 3604615D A US3604615D A US 3604615DA US 3604615 A US3604615 A US 3604615A
Authority
US
United States
Prior art keywords
lid
container
packaging unit
opening
peripheral portion
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.)
Expired - Lifetime
Application number
US779547A
Other languages
English (en)
Inventor
Gustav Sigord Barreman
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.)
FORVALTNINGS ACTA AB
Original Assignee
FORVALTNINGS ACTA AB
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 FORVALTNINGS ACTA AB filed Critical FORVALTNINGS ACTA AB
Application granted granted Critical
Publication of US3604615A publication Critical patent/US3604615A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—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
    • 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
    • B29C66/545—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 one hollow-preform being placed inside the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—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
    • B29C66/81431—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 cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/32—Cooling, or cooling and pressing, package closures after heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/02—Internal fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects

Definitions

  • the lid having peripheral drainage holes therethrough is placed in the opening on one or more support surfaces on the container walls.
  • the container rim encircling the opening is folded over and fused into consolidation with the peripheral portion of the lid to form a hermetical seal.
  • a tear string may be provided about the periphery of the lid.
  • PATENTEDSEPMIBYI 3504615 SHEET 1 BF 2 y n? (j -W PATENTEUSEPMIBTI 3504.615
  • SHEET 2 [IF 2 INVEN TOR.
  • the invention is concerned with packaging units comprising a container provided with a lid which covers the opening of said container and hermetically seals'the same and is primarily concerned with a novel type of preserving can.
  • the invention is also concerned with a method of hermetically sealing such a packaging unit and an apparatus for carrying out the method.
  • the lid is attached to the container portion either by seaming or also by soldering methods wherewith a metal different to that of the container portion and the lid is used to join these two components.
  • packaging units made-f sheet metal packaging units of the type defined in the introduction are also to be found which are made of thermoplastic-material and to which the lid is joined bymeans of heat. These packaging units, however, are primarily intended for diary products and because of their-design which generally includes an outwardly projecting side flange unsuitable for preserving cans have not found use within the preserving industry.
  • the object of the present invention is to eliminate the aforementioned disadvantages and is also intended to lower the costs of transporting such containers and to reduce checking of the packaging units subsequent to their being sealed.
  • a packaging unit of the type defined inthe 'in troduction and with which thelid is joined to the containerin'a known mannerby means of heat primarily by placing the lid of a packaging unit designed in accordance with the invention in the container opening where it rests against one or more support surfaces on the walls of the container, and in which the'edges of the container surrounding the opening are folded in over the circumferential portion of the lid and fused and consolidated together therewith;
  • a packaging unit of this type'the container portion and the lid may be made either completely of thermoplastic material or of paper, cardboard or the like coated with such a material. Because all of these materials are lighter than sheet-metal the costs of transporting said units are reduced to a corresponding, extent.
  • folding of the edges of the container walls over the circumferential portion of the lid and the welding together of said lid and container is a simple operation which, in comparison with seaming or soldering operations in the case of packaging units made of sheet metal, can be effected with relatively simple equipment which is inexpensive to operate and with appreciably reduced post checking of the completed packaging units, which because the lid and container are fused and consolidated together comprise units made of one and the same material.
  • the supportsurfaces on the container walls consist of a shoulder which extends along the walls of the container and is formed in the material of said wall.
  • the shoulder also serves as a distance member determining the used volume of the can. It is also possible to utilize the upper end surfaces of a number of reinforcing and distance ribs as the aforementioned support surfaces, the said ribs being formed in the material of the wall and spaced around the same and made to extend out along the walls from the bottom of the container towards the opening thereof.
  • reinforcing ribs which also function as distance members in determining the utilizedheight of the can, enables the container to be made with very thin walls, which adds to the lightness of the packaging unit.
  • the ribs provide the requisite rigidity of the walls.
  • both the lid and the bottom of the container can be reinforced in a known manner by means of a dome, circular orradial raised portions or the like, said reinforcements being formed in the material of the lid and the container respectivelyplf radial projections are provided on the bottom of the container said projections are suitably formed as continuations of the reinforcing and distance ribs which extend along the container walls from the. bottom of the container towards the container opening.
  • a reinforcing flange is conveniently arranged on the outside of the lid adjacent its periphery, said flange in the case of a hermetically sealed packaging unit being fused and consolidated with the inwardly folded edges of the container wallsi'
  • the wire or string cuts through the material around the edges of the lid to expose the contents of said unit. Because thematerial from which the packaging un it is made does not give rise to cutting surfaces when torn, there is no risk of cutting the hands etc. when opening the packaging unit.
  • a correct and automatic -proportioning of liquid content of a packaging unit is obtained by providing the lid of the packaging unit according to the invention with a number of drainage 1 openings in the proximity of the periphery thereof which allow excess liquid content to flow out of the container when the lid is placed on the support surface or surfaces in the opening thereof. Furthermore, the drainage openings prevent air from remaining under the lid since all air is ejected together with the excess contents of the can.
  • the lid may be given a concave shape so that air trapped beneath the same is forced to move towards the drainage holes.
  • the opposing edge portions of the container may suitably be caused to diverge towards the bottom of the container, whereby the packaging unit obtains a downwardly tapering shape.
  • the packaging unit according to the invention can either be made wholly of a plastic material or of a plasticcoated material, the advantage is gained with respect to conventional metal preserving cans that the contents can remain in an opened packaging unit for a longer period of time without going bad. Consequently, after its original use the packagingtunit according to the invention can be cleaned and used for storing foodstuffs etc. and is exceptionally well suited for use as a deep-freeze packaging unit subsequent to being provided with a suitable, separate lid. The intention is also to manufacture and retail such lids.
  • a packaging unit made according to the invention can be used both for semipreserved goods, where sterilizing is not required, and for fully preserved goods, where sterilizing is required. Owing to the fact that the packaging material cannot withstand high temperatures, sterilizing is effected in an electric oven which emits so-called cold heat. These ovens should be provided with different pressure sections to counteract any overpressure which might occur during the actual sterilizing process.
  • the lid should be provided with an evacuation pipe or the like through which the air pressure inside the packaging unit can be lowered whereafter the pipe or the like is fused and clipped off, preferably in one and the same step.
  • the invention is also concerned with a method of hermetically sealing a packaging unit of the type mentioned above consisting of a container and a lid covering the opening thereof.
  • the method is mainly characterized in that the container is placed in a device or fixture which embraces said container and fixes its position, that the lid is placed in the container opening into abutment with the support surface or surfaces, and that the edges surrounding the opening of the container walls are folded over and fused together with the peripheral portion of the lid by means of heat.
  • the center portion of the lid can suitably be cooled with air or water. It is also suitable to move the packaging unit axially in the surrounding fixture when heat is applied to the edges of the container and the peripheral portion of the lid with the heated wall edges in sliding abutment against said fixture. Together with the previously mentioned downwardly tapering shape of the packaging unit, this axial movement contributes towards providing an effective inward folding of the container wall edges over the peripheral portion of the lid.
  • the apparatus is mainly characterized in that it primarily includes a support means or fixture intended to fix the position of the container during the sealing process and a heat transfer means which is placed above said support means coaxial therewith and at least a part of which can be inserted into the fixture for the purpose of transferring heat to the edges of the container wall and the peripheral portion of the lid.
  • the fixture is preferably designed essentially as an openable and closable sleeve or the like which is shaped to embrace the walls of the container and the height of which is at least equal to the height of the container walls before the packaging unit is sealed.
  • Cooling of the lid can be facilitated by providing the free end of that part of the heat transfer means which can be inserted into the fixture, in the following called the insertable part, with a cavity which is open towards the lid of the packaging unit.
  • the insertable part of the heat transfer means should be made to conform to the flat shape and the size of the packaging unit and preferably present a wall thickness which corresponds to the width of the zone within which the wall edges of the container are folded over and fused together with the peripheral portion of the lid.
  • channels for the supply and return of the cooling medium which may be air or water or any other flowing medium suitable for the purpose, are arranged within the heat transferring device.
  • the channels are opened towards the cavity in the insertable part of the heat transfer means and there is a protective cover mounted around the channel opening.
  • the protective cover is intended to lie so that its periphery sealingly abuts the lid of the packaging unit and directs cooling medium arriving from the supply channel towards the lid but, at the same time, prevents the medium from reaching the parts of the packaging unit which are subjected to heat.
  • the heat transfer member may be completely or partially surrounded or enclosed by one or more suitable heat emitting devices which may, for instance, be in the form of an electric jacket element.
  • both the fixture and at least the free end of the insertable part of the heat transfer means may be composed of construction units which enable them to be adjusted to packaging units of different shapes and sizes.
  • FIG. 1 is a perspective view of a packaging unit made according to the invention, which is hermetically sealed by means of the apparatus shown in FIG. 7-9,
  • FIG. 2 is a plan view of the inner of the container part of the packaging unit
  • FIG. 3 is a section along the line 3-3 in FIG. 2 through the container portion, '3
  • FIG. 4 is a plan view of the lid of the packaging unit
  • FIG. 5 is a simplified section through the Iine S S in FIG. 4 ofthelid,
  • FIG. 5a is an enlarged scale of the section in FIG. 5 showing the details which were omitted from FIG. 5 for clarity,
  • FIG. 6 is an enlarged scale of a section corresponding to FIGS. 3 and 5 through the container portion and the lid, which in this Figure is placed in the container opening the lefthand portion of the Figure shows the lid loosely inserted in the opening of the container portion while the right-hand side of the Figure shows how edges surrounding the opening of the container walls are folded in over and fused and consolidated with a peripheral portion of the lid,
  • FIGS. 6a and 6b show in enlarged scale the section in FIG. 6
  • FIG. 7 is a diagrammatic plan view of an apparatus according to the invention for hermetically sealing the packaging units shown in FIGS. l6,
  • FIG. 8 is an axial section through the sealing apparatus shown in FIG. 7 before a packaging unit has been inserted therein for the purpose of being hermetically sealed, and
  • FIG. 9 is a section corresponding to FIG. 8 through the sealing apparatus subsequent to a packaging unit has been placed therein to be sealed.
  • the drawing shows a suitable, essentially cylindrical shape for the packaging unit of the invention intended as a preserving can or the like.
  • a cylindrical shape has been chosen to illustrate the invention solely for the purpose of simplifying the drawings.
  • the packaging unit of the invention may be of any shape and size, For instance, in addition to having the cylindrical shape shown, the packaging unit may be oval or square or any other preferred shape.
  • the packaging unit comprises two parts, a container 1 and a lid 2, which covers the container opening.
  • Both the container and the lid are preferably made of molded thermoplastic material but may also be made to advantage of, for instance, thermoplasticcoated fibrous material such as paper, cardboard, pasteboard or the like.
  • FIGS. 2 and 3 illustrate how the container 1 can suitably be provided with the necessary support surfaces 4 for assembling the lid 2 in the container opening.
  • said support surfaces consist of the upper end surfaces of a number of reinforcing or distance ribs 5 disposed around the container wall and formed in the actual material of said Wall and which extend along the wall from the bottom 6 of the container towards the opening.
  • the ribs fulfill a number of functions.
  • the support surfaces 4 are in the form of a shoulder extending around the wall of the container or in the form of end surfaces of the ribs 5, they can be made to slope outwardly and downwardly towards the bordering container wall portion in the manner particularly evident from FIG. 3 so as to provide the lid with the best possible support and so that the packaging unit obtains an expedient shaperetaining stiffness from the very moment the lid is inserted in the container opening.
  • the bottom 6 of the container 1 may also be reinforced which is conveniently effected by arranging a conventional dome 7 therein or by means of known circular or radial raised portions or the like (not shown).
  • the walls of the container 1 diverge towards the bottom 6, thus imparting a certain conicity which should not be less than 1.
  • F 4 and 5 show the preferred design of the lid 2 for the container 1 shown in FIGS. 2 and 3. It is evident from the aforegoing that the lid 2 shall cover the opening of the container 1 when said lid is placed on the support surfaces 4. It is therefore given a diameter which corresponds to the container opening.
  • the inside of the lid is provided at the circumference thereof with a reinforcing flange 8.
  • a portion 9 of the undersurface of the flange 8 is provided with an inclination adapted for abutment with the inclined support surfaces 4 on the ribs 5 of the container wall.
  • a second reinforcing flange 10 is arranged on the top of the lid adjacent the circumference thereof.
  • the flange 10 is intended to be fused and con solidated with the edge 11 encircling the opening of the container wall when said edge is folded over the peripheral portion of the lid 2 and fused together with said lid during the process of hermetically sealing the can.
  • the lid 2 in addition to the two special reinforcing flanges 8 and 10 may of course be provided with a dome or circular or radial raised portions or the like, formed in the actual material of the lid. No such stiffening means are employed, however, on the lid shown in the drawings.
  • the lid is provided with penetrating drainage holes 12 which permits automatic proportioning of a liquid content of the can when the lid is placed on the support surfaces 4 in the opening.
  • the holes 12 are dispersed around the lid in the vicinity of the periphery thereof to be sealed when hermetically sealing the can by the container edge 11 when it is folded over the peripheral portion of the lid 2 and fused and consolidated therewith. in the case of the lid of the illustrative embodiment,
  • the holes 12 are arranged in the bottom of a groove 14 which is intended to accommodate a tear wire or string 13.
  • the groove 14 is placed in the flange 8 on the inside of the lid where for obvious reasons it is preferably situated behind the portion 9 of the underneath of the flange which presents an inclined surface adapted for abutment with the inclined sup port surfaces 4.
  • the tear wire or string 13 may be attached to the lid 2 in a number of ways, of which only one has been illustrated and may be made of stainless steel or some other suitable material.
  • the element 13 is intended to facilitate opening of the packaging unit, and in the illustrative embodiment is shown already mounted in groove 14 in lid 2 when this is placed in the container opening.
  • the groove 14 and wire 13 extend around the larger portion of the lid to enable the contents of the can to be reached easily when said can is opened by means of the wire.
  • the portion 15 of the lid, FIG. 1, which is not cut by the wire when the can is opened is sufficiently large to form a hinge for the lid and to permit the lid to be removed from the container 1 easily.
  • the two ends 16,17 of the wire 13 extend out from the outside of the lid and at least one end 16 is long enough to provide sufiicient grip when opening the can while the other 17 need only be bent down, for instance, to prevent the wire from sliding in groove 14 instead of tearing the lid 2.
  • the end 16 of wire 13 may also be provided with some suitable form of gripping means such as a loop or the like and the end 17 may be made thicker or be knotted etc.
  • the lid 2 When applying the method of the invention to seal hermetically the packaging unit shown in FIGS. 1-6, the lid 2 is placed in the container opening where, as can be seen in FIG. 6 and partly in FIG. 6a, said lid rests with the flange portion 9 against support surfaces 4 on the ribs 5.
  • the edge 11 encircling the opening of the container wall is then folded over and fused with the peripheral portion of the lid and the flange 10 within said peripheral portion on top of the lid as can be seen from the right-hand side of FIG. 6 and from FIG. 6a.
  • annular raised portion 18 extending around the circumference of the top of the packaging unit whereupon it should be seen that said raised portion is of such form that the units can be safely stacked, one on top of the other. It is also possible to provide the bottom of the cans with a similar annular raised portion to improve further the possibility of stacking the cans.
  • FIGS. 7-9 show an apparatus for hermetically sealing the packaging unit illustrated in FIGS. 1-6 and which in accordance with the invention consists essentially of a support means 20 intended for fixing the position of the container 1 during the sealing process, and a heat transfer means 21 arranged axially above said means 20. Heat is transmitted by the heat transfer means 21 of which at least part 22. can be inserted into the support means or fixture 20 to the edge of the container wall and the peripheral portion of the lid to fuse and consolidate said elements together.
  • the unit When sealing the packaging unit, the unit is passed into the support means or fixture 20, suitably by means of an automatically operating conveyor system, and the lid placed in the opening of the container whereupon the part 22 of the heat transfer means 21, which can be inserted into the support means 20, is brought into contact with container wall 11 to heat said wall and fold the same over the contemporaneously heated peripheral portion of the lid to be fused and consolidated therewith. Subsequent to the completion of the sealing process, the sealed packaging unit is removed from the fixture 20.
  • the fixture can be designed to be opened and closed and is for this purpose divided into two halves 23 and 24 which when brought together form a sleeve around the container portion 1.
  • the dimensions of the sleeve should be such to allow an axial movement of some few millimeters of the container in the sleeve when heat is applied to the edge 11 of the wall and the peripheral portion of the lid. During this movement the hot edge is in sliding contact with the wall of the sleeve; it is for this purpose the walls of the containerare made to converge towards the bottom of the container.
  • the axial displacement of the container in the sleeve is intended to contribute towards effective folding of the edge 11 over the peripheral portion of the lid 2.
  • the part 22 of the heat transfer means 21,.which can be inserted in the fixture 20, is annular in shape and made in one piece and is adapted in shape and size to the packaging unit shown in FIGS. 1-6. in the case of oval or square, for instance, packaging units, the shape and size of the part 22 must be changed accordingly.
  • the means 21 and part 22 are suitably made of copper.
  • the insertable part 20 of t he heat transfer means is fitted to the lower end of a copper sleeve 25 which is adapted in some suitable manner to be moved vertically and secured to said sleeve by means of bolts 26, for example.
  • the sleeve is encircled above the exchangeable part 22 by an electric jacket element 27 which is only shown diagrammatically in the Figures.
  • the jacket element 27 is preferably controlled by a thermostat.
  • each of the tubes is connected at the top with a hose, pipe or the like 30 and 31 respectively.
  • Water, air or some other suitable coolant is passed through the hose or pipe 31 and the tube 2? to the interior of a funnel shaped protective cover 32 which is suitably attached to the bottom of tube 28 and which through the intermediary of a heat resistant seal 33 located at the bottom edge of said cover abuts the outside of the lid 2 during the sealing procedure.
  • the funnel shaped protective cover 32 is provided at the top thereof with a number of holes 34 arranged in a circle to connect the interior of the cover 32 with the annular passage 35 formed between the tubes 28 and 29,
  • the coolant is returned through holes 34 to the annular passage 35 which thus constitutes a return channel for the coolant.
  • the cover 32 directs the coolant arriving from the supply channels 31,29 towards the lid 2 simultaneously as it prevents the medium from reaching those portions of the packaging unit which are subjected to heat and ensures that the coolant is returned through the holes 34 to the return channel 35.
  • the sealing apparatus and its different components can also be designed differently.
  • cooling can be effected by spraying cooling water freely over the packaging unit whereby the unit is cleaned at the same time.
  • the insertable part of the heat transfer means can be designed so that its surfaces which come into contact with the packaging unit contribute directly to the step of folding the edges of the container walls over the peripheral portion of the lid.
  • a packaging unit comprising a container having an opening and a lid covering said opening, said lid being placed in said opening on at least one support surface on the container walls, the edges of the container walls which encircle said opening being folded over and fused into consolidation with the peripheral portion of said lid to form a hermetical seal, said lid having drainage holes therethrough in the vicinity of its periphery, said holes being closed by said edges of said container walls folded over said peripheral portion of said lid and fused and consolidated therewith.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing Of Containers (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Cartons (AREA)
  • Closures For Containers (AREA)
  • Packages (AREA)
US779547A 1967-12-06 1968-11-27 Sealed packaging unit with tear string Expired - Lifetime US3604615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE16758/67A SE334842B (sv) 1967-12-06 1967-12-06

Publications (1)

Publication Number Publication Date
US3604615A true US3604615A (en) 1971-09-14

Family

ID=20302701

Family Applications (1)

Application Number Title Priority Date Filing Date
US779547A Expired - Lifetime US3604615A (en) 1967-12-06 1968-11-27 Sealed packaging unit with tear string

Country Status (16)

Country Link
US (1) US3604615A (sv)
BE (1) BE724994A (sv)
BR (1) BR6804605D0 (sv)
CH (1) CH502927A (sv)
DE (1) DE1812198A1 (sv)
ES (2) ES361087A1 (sv)
FI (1) FI50951C (sv)
FR (1) FR1603487A (sv)
GB (1) GB1254300A (sv)
IE (1) IE32546B1 (sv)
IL (1) IL31230A (sv)
IS (1) IS1809A7 (sv)
NL (1) NL6817406A (sv)
NO (1) NO128705B (sv)
SE (1) SE334842B (sv)
YU (1) YU31386B (sv)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK152770B (da) * 1976-09-07 1988-05-09 Ibm Indretning til trinloes indstillelig billedformindskelse ved en elektrografisk kopieringsmaskine.
US5305583A (en) * 1990-03-26 1994-04-26 Norden Pac Development Ab Method and apparatus for controlling the temperature of a container end portion during manufacture
US5473860A (en) * 1991-09-03 1995-12-12 Norden Pac Development Ab Method and apparatus for manufacturing a container filled with a product
US6702582B1 (en) * 2001-11-08 2004-03-09 Lynnea C. Salvo Device and method for solving circles
US6817819B2 (en) 2001-11-27 2004-11-16 Omnitech International, Inc. Easy-open container end
CN111153019A (zh) * 2020-03-18 2020-05-15 中国人民解放军陆军特色医学中心 血袋转运箱

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2490542A1 (fr) * 1980-09-23 1982-03-26 Marketube Scop Sa Procede de fabrication d'un tube a fond rapporte

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US790967A (en) * 1904-07-23 1905-05-30 Egbert Moxham Process of making pulp kegs or other packages.
US916485A (en) * 1908-05-05 1909-03-30 Major Dane Porter Container.
US1678330A (en) * 1926-05-24 1928-07-24 Robert G Clyne Container and process of producing the same
US1992182A (en) * 1933-10-09 1935-02-26 Buist Lyman Ormiston Container
US2106738A (en) * 1935-12-19 1938-02-01 John K M Harrison Paper and analogous material container
US2120899A (en) * 1934-07-17 1938-06-14 Humoco Corp Method of making containers
US2642911A (en) * 1949-06-20 1953-06-23 Jr James Clifton De Shazor Closure for containers
US3113689A (en) * 1961-10-03 1963-12-10 Moussong Monika Clamping plates for small containers, particularly ampoules
US3362571A (en) * 1965-08-09 1968-01-09 Alusuisse Container with tear open seal
US3369726A (en) * 1966-03-04 1968-02-20 Phillips Petroleum Co Container

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US790967A (en) * 1904-07-23 1905-05-30 Egbert Moxham Process of making pulp kegs or other packages.
US916485A (en) * 1908-05-05 1909-03-30 Major Dane Porter Container.
US1678330A (en) * 1926-05-24 1928-07-24 Robert G Clyne Container and process of producing the same
US1992182A (en) * 1933-10-09 1935-02-26 Buist Lyman Ormiston Container
US2120899A (en) * 1934-07-17 1938-06-14 Humoco Corp Method of making containers
US2106738A (en) * 1935-12-19 1938-02-01 John K M Harrison Paper and analogous material container
US2642911A (en) * 1949-06-20 1953-06-23 Jr James Clifton De Shazor Closure for containers
US3113689A (en) * 1961-10-03 1963-12-10 Moussong Monika Clamping plates for small containers, particularly ampoules
US3362571A (en) * 1965-08-09 1968-01-09 Alusuisse Container with tear open seal
US3369726A (en) * 1966-03-04 1968-02-20 Phillips Petroleum Co Container

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK152770B (da) * 1976-09-07 1988-05-09 Ibm Indretning til trinloes indstillelig billedformindskelse ved en elektrografisk kopieringsmaskine.
US5305583A (en) * 1990-03-26 1994-04-26 Norden Pac Development Ab Method and apparatus for controlling the temperature of a container end portion during manufacture
US5473860A (en) * 1991-09-03 1995-12-12 Norden Pac Development Ab Method and apparatus for manufacturing a container filled with a product
US6702582B1 (en) * 2001-11-08 2004-03-09 Lynnea C. Salvo Device and method for solving circles
US6817819B2 (en) 2001-11-27 2004-11-16 Omnitech International, Inc. Easy-open container end
CN111153019A (zh) * 2020-03-18 2020-05-15 中国人民解放军陆军特色医学中心 血袋转运箱

Also Published As

Publication number Publication date
ES158152U (es) 1970-10-01
YU31386B (en) 1973-04-30
IE32546B1 (en) 1973-09-05
BE724994A (sv) 1969-05-16
FI50951B (sv) 1976-05-31
IL31230A (en) 1971-08-25
ES361087A1 (es) 1970-10-16
IL31230A0 (en) 1969-02-27
IS1809A7 (is) 1969-01-22
BR6804605D0 (pt) 1973-01-30
IE32546L (en) 1969-06-06
NL6817406A (sv) 1969-06-10
SE334842B (sv) 1971-05-03
FR1603487A (sv) 1971-04-19
NO128705B (sv) 1974-01-02
CH502927A (de) 1971-02-15
FI50951C (sv) 1976-09-10
ES158152Y (es) 1971-08-01
GB1254300A (en) 1971-11-17
DE1812198A1 (de) 1969-07-03

Similar Documents

Publication Publication Date Title
US3445050A (en) Package for foodstuffs
US2998158A (en) Severable sealing means for reusable packages
US4113095A (en) Tray-type processed food containers
US4557398A (en) End closure structure for a container
US2652148A (en) Combination package
US4784113A (en) Handy heating container
US3407922A (en) Dispensing cup assembly with a material-receiving cavity
US3604615A (en) Sealed packaging unit with tear string
US2327447A (en) Self-heating food container
US3338406A (en) Carton construction
EP2308764A1 (en) Plastic can package
US5480057A (en) Bulk container having flexible inner container and rigid outer container
US2371173A (en) Container
US3653581A (en) Hermetic packaging with plastic container
US3243075A (en) Container body and closure structure
US2920967A (en) Method of packaging liquids
US4441625A (en) Package having a resealing device
JPS61104931A (ja) 無菌の包装体を製造するための方法
US2961140A (en) Food container
JPS5847014Y2 (ja) 包装容器
US3834607A (en) Rigid paperboard container
US2267422A (en) Closing of tins
US4993577A (en) Containers
EP0481943A1 (en) A package and a method for sealing the package
NZ238741A (en) Beverage container with straw piercable top access forming folding tab for venting