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US3628301A - Closuring containers - Google Patents

Closuring containers Download PDF

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Publication number
US3628301A
US3628301A US3628301DA US3628301A US 3628301 A US3628301 A US 3628301A US 3628301D A US3628301D A US 3628301DA US 3628301 A US3628301 A US 3628301A
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United States
Prior art keywords
container
sheet
lip
process according
portions
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English (en)
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Emile Raymond Vermeulen
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Sidaplax
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Sidaplax
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    • 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
    • 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
    • B29C66/13—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
    • B29C66/10—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
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed 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
    • B29C66/70—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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7371—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 state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—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 state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7371—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 state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—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 state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • B29C66/73713—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 state of the material of the parts to be joined oriented or heat-shrinkable oriented bi-axially or multi-axially
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7371—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 state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73715—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 state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
    • 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
    • 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
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    • 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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—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 being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • 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
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    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • 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
    • B65B7/285—Securing closures on containers by deformation of the closure
    • 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
    • B65B7/2885—Securing closures on containers by heat-shrinking
    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/24—Caps or cap-like covers made of shrinkable material or formed in situ by dipping, e.g. using gelatine or celluloid
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • 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
    • B29C66/24223—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 oval
    • 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
    • B29C66/2424—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 a closed polygonal chain
    • B29C66/24243—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 a closed polygonal chain forming a quadrilateral
    • B29C66/24244—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 a closed polygonal chain forming a quadrilateral forming a rectangle
    • 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
    • B29C66/2424—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 a closed polygonal chain
    • B29C66/24243—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 a closed polygonal chain forming a quadrilateral
    • B29C66/24244—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 a closed polygonal chain forming a quadrilateral forming a rectangle
    • B29C66/24245—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 a closed polygonal chain forming a quadrilateral forming a rectangle forming a square
    • 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
    • B29C66/2424—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 a closed polygonal chain
    • B29C66/24249—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 a closed polygonal chain forming a specific polygon not provided for in B29C66/24241 - B29C66/24243
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7132—Bowls, Cups, Glasses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2105/00—Rigid or semi-rigid containers made by assembling separate sheets, blanks or webs
    • B31B2105/002—Making boxes characterised by the shape of the blanks from which they are formed
    • B31B2105/0022—Making boxes from tubular webs or blanks, e.g. with separate bottoms, including tube or bottom forming operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping

Definitions

  • the package thus formed includes a sheet closure of biaxially orientatable thermoplastic, the closure having an outer biaxially orientated portion crimped tightly under the lip of a container without -being heat-sealed thereto and an inner, taut, relatively unorientated portion extended over an open end of the container.
  • This invention relates to the closuring of containers, and particularly to a new method and apparatus for applying to a lipped container a closure of biaxially orientated thermoplastic resin.
  • the invention also relates to the closured containers so produced.
  • a heat seal or an adhesive can fail where a drop of the container contents has contaminated part of the seal area.
  • the temperatures necessary to effect shrinkage or a heat seal can cause embrittlement of surrounding areas of the biaxially orientated resin with consequent danger of fracture in transportation.
  • a heat-sealed closure is furthermore difficult to remove completely and a heat-seal lacquer can leave undesirable residues.
  • a process for closuring a container which comprises placing a flat sheet of biaxially orientated thermoplastic resin over the open top of a lipped container so that it overlaps the lipped edges of the container, pushing down the overlapping portions of the sheet with a heated element while clamping tightly against the container and thus preventing any heat-softened parts of the sheet from shrinking, yet avoiding heat sealing such heat-softened parts to the container, crimping without shrinking the pushed-down portions underneath and against the lipped edges of the container, and shrinking the portion of the flat sheet that extends over the open top of the container so as to pull the crimped pushed-down portions tightly underneath and against the lipped edges of the container.
  • the invention further includes apparatus for closuring a lipped container by means of a flat sheet of biaxially orientated thermoplastic resin placed over the open top of the container, and comprises aheatable element movable so as to push-down portions of the sheet overlapping the lipped edges of the container, means for clamping tightly against the container and thus preventing from shrinking any heat-softened parts of the sheet yet avoiding heat sealing such heat-softened parts to the container, means for crimping without shrinking the pushed-down portions underneath and against the lipped edges of the container, and means for shrinking the portion of the flat sheet that extends over the open top of the container so as to pull the crimped pushed-down portions tightly underneath and against the lipped edges of the container.
  • the heated element that pushes down the overlapping portions of the sheet preferably comprises a frame having interior dimensions slightly larger than the lip of the container. Preferably these dimensions are so chosen that the frame clamps the small area of biaxially orientated sheet that abuts against the outer edge of the container lip.
  • the frame thus needs to be designed to suit the particular container being used and it is therefore preferable that the apparatus as a whole should be so designed that interchangeable frames can be fitted.
  • the part of the heated element that first meets the resin sheet is shaped or chamfered so that the overlapping portions are progressively bent down over the lip of the container, and in an especially preferred arrangement this part of the heated element has ribs so that the sheet is heat softened at discrete areas spaced around the container rim, this assisting in the subsequent crimping operation by inducing the formation of evenly spaced crimps or pleats.
  • FIG. l is a vertical cross section of the apparatus showing the first stage in an operation of closuring a container
  • FIG. 2 is a cross section similar to that shown in FIG. I but showing the second stage in the closuring operation
  • FIG. 3 is a similar cross section showing the third stage.
  • FIG. 4 is an enlarged perspective view of part of the heated frame, showing the arrangement of ribs on its inner surface.
  • the apparatus of the invention comprises upper and lower assemblies 1 and 2 respectively which are relatively movable in the vertical direction.
  • a filled container 3 can be placed in a holder 4 held by a screw 5 on a fixed piston 6 that is integral with a baseplate 7.
  • a drain hole 8 in the screw and the piston permits the draining of any container contents that might be inadvertently spilled in the holder 4.
  • the upper assembly ll comprises an electrically heated frame 9 vertically movable by means of a hydraulic or pneumatic cylinder (not shown) controlled by a suitable timing mechanism.
  • the inner dimensions of the frame are just larger than those of the lipped edge of the container, and its lower part I0 is chamfered away as shown in FIG. 4.
  • FIG. 4 also shows the disposition of ribs 11 spaced around the chamfered part of the frame.
  • a pressure plate 12 mounted on a vertical rod 13 that is slidably mounted in the frame 9 and a housing 14.
  • a coil spring; 15 acting between the top of the housing and a collar on the rod 13 urges the pressure plate downwardly with respect to the frame 9.
  • the pressure plate is not separately heated but becomes hot by conduction from the frame.
  • a cold, unheated, crimping sleeve MS has an upper edge 17 corresponding to the lower surface of the lip of a container; it surrounds and is vertically slidable on the container holder 4 so that it can be moved into and out of contact with the container lip.
  • Vertical movement of the crimping sleeve 16 is achieved by the admission of a fluid under pressure through ports 18 and 19 to either of two annular spaces 20 and 21 that surround the fixed piston 6 and are situated respectively above and below a ring 22 attached to the crimping sleeve.
  • Flexible O-ring seals 23, 24 and 25 and a washer 26 prevent the escape of fluid from the annular chambers, and the opening and closing of the ports is controlled by the timing mechanism.
  • a vertically movable circular knife 27 Surrounding the crimping sleeve is a vertically movable circular knife 27 that is urged upwards by a spring (not shown) against the lower part 10 of the frame 9 when the latter is lowered but is prevented by means of a stop (not shown) from remaining in contact with the frame when the latter is raised.
  • the upper assembly When the apparatus is in operation, the upper assembly is moved away from the lower assembly sufficiently to enable a filled container to be placed in the holder 4 with a sheet of biaxially orientated resin 28 over its open top (this movement can be either vertical or horizontal), and the upper assembly is then brought to the position shown in FIG. 1. From this position the upper assembly is pushed quickly down to the position shown in FIG. 2, from which it will be seen that the hot pressure plate 12 has first clamped the orientated resin sheet against the container edge, holding it in position and physically preventing it from shrinking at this region, and that immediately afterwards the frame 9 has pushed down the sheet onto the knife 27 so that unwanted portions are cut away.
  • the frame has pushed down the parts of the sheet overlapping the container edge, heating them at the points of contact with the ribs 11 but not sufficiently to cause them to shrink.
  • the edges of the sheet are pushed down they become cockled around the periphery, the spaced heated portions assisting in this, and alternate parts of the cockled edges are thus forced underneath the lip of the container as shown in FIG. 2.
  • FIG. 2 The position shown in FIG. 2 is quickly followed by that shown in FIG. 3.
  • the crimping sleeve has moved up to crimp or pleat the pushed-down portions of the sheet against the underneath of the container lip. It is assisted in this by the spaced portions heated by the ribs 1 l, but still no shrinkage of the resin takes place as the crimping sleeve is cold.
  • the position of FIG. 3 is maintained for a few seconds, during which the heat of the pressure plate 12 causes the central portion of the sheet to shrink, pulling the crimped edge portions into tight mechanical engagement with the container lip and giving the closure a smooth taut surface.
  • the upper assembly is then moved away permitting removal of the closured container and substitution of a new one.
  • a fingernail When it is desired to open the container, a fingernail can be inserted under the crimped edge of the closure to pull the latter upwards and either tear it or spring it over the container lip; since the closure is not sealed or adhered to the container in any way, it parts from the container without leaving residue.
  • the lower assembly is fixed and the upper one movable, but it would be equally suitable if the upper assembly were fixed and the lower one movable, or alternatively both assemblies can be movable towards or away from each other.
  • Biaxially orientated thermoplastic resins in sheet form which are useful in the invention are available commercially, and very suitable ones are the transparent sheets of biorientated polystyrene such as are sold under the name Polyflex" (registered trademark).
  • Other orientated resins can, however, be employed, for instance polyacrylates; polymethacrylates; polycarbonates; polyvinylchloride; polyethylene terephthalates; isotactic polypropylene and styrene copolymers, for instance a styrene-acrylonitrile copolymer or a rubber-modified high-impact polystyrene.
  • the translucent sheets of biorientated high-impact polystyrene sold under the name Bohips" (trademark) are also particularly suitable.
  • the sheet has a thickness between 0.0005 and 0.02 inch, particularly between 0.001 and 0.008 inch.
  • a sheet of thickness 0.001 or 0.002 inch is often convenient to use.
  • the sheet overlaps the lipped edges of the container, that is to say the flat sheet projects beyond the edges of the container, and the extent to which it does this depends on the depth of skirt" that is required around the rim of the final, closured container.
  • the skirt it is desirable for the skirt to be of sufficient depth to give hygienic protection for the portion of the walls of the cup that will eventually come into contact with the lips of the user; for this purpose a skirt depth of about 0.25 to 0.5 inch is normally suitable.
  • the skirt is simply intended for packaging it is sufficient if the skirt is of sufficient depth to give a strong closure; for example, the edge of the sheet can coincide with the junction between the sidewall and lip of the container.
  • a slight downwardly extending skirt is, however, generally desirable since this assists in opening the package by inserting a fingernail under the closure.
  • Another way of assisting opening, particularly where there is no skirt, is by the inclusion of a tear strip of, for example, cellulose acetate film placed across the open top of the container before the sealing operation is performed and with its end protruding over the lipped container edges so that it remains trapped beneath the closure and can be pulled upwards to open the container when desired.
  • the spacing between the ribs is preferably chosen so that it is similar to the depth of the skirt, if any.
  • the ribs can be about 0.25 to 0.5 inch apart.
  • the time/temperature cycle must be designed to ensure that the edge portions of the biaxially orientated resin are not permitted to shrink because otherwise the resin becomes embrittled and the closure fails in use. Nevertheless, the temperature employed needs to be sufficient to heat soften these edge portions so they must be quickly clamped and crimped so that they are physically prevented from shrinking while in the heat-softened state. Another requirement is that the closure should not become heat sealed to the container; otherwise embrittlement and consequent failure will again occur and the closure will not be easily removable.
  • a temperature of to 140 C. preferably from 133 to 137 C.
  • the pressure plate reaches by conduction a temperature from 125 to C. very often from 128 to 132 C.
  • the time taken to push down the overlapping portions of the sheet is normally very short, in general it is preferably less than 0.5 second and more preferably from 0.1 to 0.25 second.
  • the interval between pushing down the overlapping portions of the sheet and crimping them against the container edge is also preferably short, not more than 1.5 seconds and preferably from 0.2 to 1 second. After the crimping operation has been performed, it is preferable to keep the crimping sleeve in position for a further period ranging from 1 to 5 seconds and very often from 1.5 to 3 seconds, during which shrinking of the central portion of the fiat sheet takes place.
  • the crimping sleeve is cold, that is to say its temperature is less than the softening point of the resin, for instance from 10 to 50 C.; normally atmospheric cooling is sufficient to achieve this condition. otherwise cooling by water through appropriately disposed channels or air cooling by means of a fan is easy to achieve.
  • the pressure plate is heated by conduction from the heated frame, however it can be independently heated if desired; alternatively a suitable ring can be employed to clamp the heat-softened parts of the sheet, the central portion of the sheet being heated by means of a radiant heater or a blast of hot gas.
  • the sheet can be in the form of a precut blank, the knife (or a similarly shaped sleeve) being then employed merely to position the blank in its proper spatial relationship to the container.
  • the knife or a similarly shaped sleeve
  • This may be preferable since it is not always easy to cut a biaxially orientated resin without producing a certain amount of swarf and this might fall into the container and contaminate its contents if in-position cutting were employed.
  • the drain hole designated as 8 in the illustrated apparatus can be enlarged sufficiently to accommodate a plunger designed to eject the finished container at the end of the operation, or ejection can be by means of compressed air applied through the drain hole or a separate duct.
  • each lower assembly For automatic operation there can be a number of lower assemblies, each holding a filled container, which cooperate with and in turn move past one upper assembly; the motion of the lower assemblies can be continuous or discontinuous and in the former case the upper assembly would be designed to travel with each lower assembly for a short distance before being lifted and returned rapidly to intercept the next lower assembly.
  • a number of pairs of upper and lower assemblies can be positioned around a carrousel or turntable apparatus, a series of containers being fed to these as they move past a feed point. The filling and closuring operations can then take place as the containers move around the turntable until they reach a discharge station.
  • Containers that can suitably be closured by the process of the invention can be of virtually any material, for example a synthetic resin, thermoplastic or thermosetting, glass, paper cardboard, paper pulp, aluminum or sheet steel.
  • the container is of a thermoplastic resin, particularly a polymer or copolymer of an olefinically unsaturated monomer such as ethylene, propylene, styrene, acrylonitrile or methyl methacrylate.
  • containers of polyethylene, polystyrene (including toughened polystyrene) or styrene-acrylonitrile copolymer are especially preferred.
  • Containers of a thermoplastic resin can, for example, be made by injection molding or by vacuumor fluid-pressure forming.
  • the containers need not have a circular mouth, the mouth can be of any desired shape, for example square, rectangular, hexagonal or oval.
  • EXAMPLE This example describes a process according to the invention for closuring an injection-molded polystyrene cup containing milk.
  • the cup was injection molded from polystyrene and had a capacity of 7 fluid ounces. It had a circular rim of diameter 2.75 inches with a lip 0.1 inch wide.
  • the cup was filled nearly to the brim with milk at a temperature of 10 C. and placed in the holder of an apparatus as described above and illustrated in the drawings accompanying the specification.
  • a sheet of biaxially orientated polystyrene in the form of a flat circular blank of diameter 3.5 inches and thickness 0.002 inch was placed over the open top of the cup and the upper assembly was brought down onto it within 0.2 second.
  • the temperature of the heated frame was 135 C. while that of the pressure plate was 130 C. and the temperature of the crimping sleeve 7 was 20 C.
  • a process of closuring a container which comprises placing a sheet of biaxially orientated thermoplastic resin over the open top of a lipped container so that it overlaps the lip of said container, pushing the overlapping portion of the sheet down with a heated element while clamping the sheet tightly against the container to prevent any heat-softened portions of the sheet which contact the container from shrinking yet avoiding heat sealing said heat-softened portions to the container, crimping the pushed-down portions underneath and against the lip of the container without shrinking said pushed-down portions and shrinking a portion of the sheet extending across the open top of the container to pull the crimped, pusheddown portions tightly underneath and against the lip of the container after dissipation of said clamping action.
  • a process according to claim 2 in which the time taken to push down the overlapping portions of the sheet is from 0.1 to 0.25 second.
  • a process according to claim 5 wherein the temperature of the crimping sleeve is between 10 to 50 C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Closing Of Containers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
US3628301D 1968-10-28 1969-10-21 Closuring containers Expired - Lifetime US3628301A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5105868A GB1241425A (en) 1968-10-28 1968-10-28 Improvements in or relating to the closuring of containers

Publications (1)

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US3628301A true US3628301A (en) 1971-12-21

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Family Applications (1)

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US3628301D Expired - Lifetime US3628301A (en) 1968-10-28 1969-10-21 Closuring containers

Country Status (7)

Country Link
US (1) US3628301A (de)
BE (1) BE740861A (de)
DE (1) DE1953420C3 (de)
FR (1) FR2021736A1 (de)
GB (1) GB1241425A (de)
NL (1) NL6915818A (de)
SE (1) SE363272B (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690091A (en) * 1970-08-20 1972-09-12 Christenssons Maskiner Method for the production of a package, preferably for dry and frozen material
US5230205A (en) * 1990-12-03 1993-07-27 Erca S.A. Method and apparatus for positioning a strip of tops on a set of receptacles, prior to sealing
US5371996A (en) * 1992-03-06 1994-12-13 Shikoku Kakoki Co., Ltd. Apparatus for sealing containers
US5511360A (en) * 1992-04-27 1996-04-30 William J. Bakker Container for receiving head shrinking film and method for forming a spill-resistant cover therefor
US5577370A (en) * 1994-03-07 1996-11-26 The Pillsbury Company Apparatus for sealing a container
US5993942A (en) * 1992-04-27 1999-11-30 Bakker; William J. Packaging film for forming packages
US6739109B1 (en) * 2002-12-20 2004-05-25 Jui Chuan Fan Sealing device for a disposable cup
US20050155324A1 (en) * 2002-06-05 2005-07-21 Gayet Xavier M. Device for closing containers made of plastic
US10336482B2 (en) * 2016-10-21 2019-07-02 General Electric Technology Gmbh System, method and apparatus for preserving and capping tubes
US11155377B2 (en) * 2012-10-19 2021-10-26 Intercontinental Great Brands Llc Capsules
US20230202693A1 (en) * 2020-04-30 2023-06-29 Abarka Packaging Solutions B.V. Method and a Device for Heat-Sealing a Film/Foil Onto a Peripheral Top Edge of a Packaging and Such a Packaging

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2119887A1 (en) * 1970-12-31 1972-08-11 Duvicq Jean Heat shrink bottle cap - for tamperproof and leakproof sealing of resealing
US4948441A (en) * 1988-08-15 1990-08-14 Rampart Packaging Inc. Method and apparatus for fabrication of an openable container lid
US5032213A (en) * 1989-02-06 1991-07-16 Rampart Packaging Inc. Thermal lid sealing method and apparatus
CN113212880A (zh) * 2021-05-08 2021-08-06 曾以南 一种食品加工用奶粉灌装封膜设备
DE102022002202A1 (de) 2022-06-17 2023-12-28 Gebrüder Hopf Rennsteig Feinkost GmbH Versiegelter Behälter für Lebensmittelprodukte, sowie eine Vorrichtung und ein Verfahren zum Versiegeln der Öffnung eines Behälters für Lebensmittelprodukte

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017729A (en) * 1959-05-26 1962-01-23 Reynolds Metals Co Shrinkable container closure and manufacture thereof
US3345798A (en) * 1962-03-26 1967-10-10 Grace W R & Co Method and apparatus for making and applying closures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017729A (en) * 1959-05-26 1962-01-23 Reynolds Metals Co Shrinkable container closure and manufacture thereof
US3345798A (en) * 1962-03-26 1967-10-10 Grace W R & Co Method and apparatus for making and applying closures

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690091A (en) * 1970-08-20 1972-09-12 Christenssons Maskiner Method for the production of a package, preferably for dry and frozen material
US5230205A (en) * 1990-12-03 1993-07-27 Erca S.A. Method and apparatus for positioning a strip of tops on a set of receptacles, prior to sealing
US5371996A (en) * 1992-03-06 1994-12-13 Shikoku Kakoki Co., Ltd. Apparatus for sealing containers
US5993942A (en) * 1992-04-27 1999-11-30 Bakker; William J. Packaging film for forming packages
US5511360A (en) * 1992-04-27 1996-04-30 William J. Bakker Container for receiving head shrinking film and method for forming a spill-resistant cover therefor
US6291037B1 (en) 1992-04-27 2001-09-18 William J. Bakker Packaging film for forming packages
US5577370A (en) * 1994-03-07 1996-11-26 The Pillsbury Company Apparatus for sealing a container
US5715967A (en) * 1994-03-07 1998-02-10 The Pillsbury Company Apparatus for sealing a container
US6058682A (en) * 1994-03-07 2000-05-09 The Pillsbury Company Method for sealing a container
US20050155324A1 (en) * 2002-06-05 2005-07-21 Gayet Xavier M. Device for closing containers made of plastic
US6739109B1 (en) * 2002-12-20 2004-05-25 Jui Chuan Fan Sealing device for a disposable cup
US11155377B2 (en) * 2012-10-19 2021-10-26 Intercontinental Great Brands Llc Capsules
US10336482B2 (en) * 2016-10-21 2019-07-02 General Electric Technology Gmbh System, method and apparatus for preserving and capping tubes
US20230202693A1 (en) * 2020-04-30 2023-06-29 Abarka Packaging Solutions B.V. Method and a Device for Heat-Sealing a Film/Foil Onto a Peripheral Top Edge of a Packaging and Such a Packaging

Also Published As

Publication number Publication date
NL6915818A (en) 1970-05-01
DE1953420B2 (de) 1974-10-31
BE740861A (de) 1970-04-27
GB1241425A (en) 1971-08-04
DE1953420C3 (de) 1975-06-12
FR2021736A1 (de) 1970-07-24
SE363272B (de) 1974-01-14
DE1953420A1 (de) 1970-10-22

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