WO2003104084A1 - Dispositivo de cierre de envases de material plastico - Google Patents

Dispositivo de cierre de envases de material plastico Download PDF

Info

Publication number
WO2003104084A1
WO2003104084A1 PCT/ES2003/000265 ES0300265W WO03104084A1 WO 2003104084 A1 WO2003104084 A1 WO 2003104084A1 ES 0300265 W ES0300265 W ES 0300265W WO 03104084 A1 WO03104084 A1 WO 03104084A1
Authority
WO
WIPO (PCT)
Prior art keywords
edge
wall
peripheral wing
sheet
mouth
Prior art date
Application number
PCT/ES2003/000265
Other languages
English (en)
French (fr)
Inventor
Xavier Miret Gayet
Original Assignee
Xavier Miret Gayet
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 Xavier Miret Gayet filed Critical Xavier Miret Gayet
Priority to AU2003232857A priority Critical patent/AU2003232857A1/en
Priority to DE60318573T priority patent/DE60318573T2/de
Priority to JP2004511168A priority patent/JP4426441B2/ja
Priority to US10/516,973 priority patent/US20050155324A1/en
Priority to EP03757077A priority patent/EP1510459B1/en
Publication of WO2003104084A1 publication Critical patent/WO2003104084A1/es

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/326—Shaping the burr, e.g. by the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C65/743—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 the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7443—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 the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc by means of ultrasonic vibrations
    • 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • 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
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/50—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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—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
    • B29C66/81413—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 non-symmetrical
    • 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
    • B29C66/81417—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 being V-shaped
    • 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
    • B29C66/81433—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • B65B51/225—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by ultrasonic welding
    • 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
    • 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
    • B29L2031/7162—Boxes, cartons, cases
    • B29L2031/7164—Blister packages

Definitions

  • the present invention relates to a closure system for plastic material containers which performs the cutting and welding operations simultaneously and which is used for the closure and cutting of blister-type containers and the like in continuous assembly chains, based on the use of molds together with the use of an ultrasound emitting device.
  • these devices are of the thermal type, that is, they use heat to melt the constituent material of the container lid and attach it to the container itself.
  • These systems have the disadvantage that they tend to be expensive due to the need to apply heat sealable lacquers on one of the sheets to be joined.
  • the finish is of low quality producing folds and curls of the containers when they cool.
  • EP-A-0493690 describes an apparatus that is used to weld a lid of plastic material to a canister-shaped container, the apparatus has a tool that engages outside the lid or outside the container and a internal tool that is inserted in the lid, the internal tool being a sonotrode and the outer tool a conical ring that can be moved radially to achieve the closure of the container.
  • This device only has the function of welding a lid to an independent container and cannot be used for blister packs or for several containers at the same time, which is not too interesting since the unit welding times are high. In addition, this device does not have the possibility of simultaneously cutting the plastic from the containers.
  • Document ES-A-2100777 describes an ultrasonic welding and cutting device, especially applied to quilted fabrics comprising means of movement, means for fixing its position and an ultrasonic or sonotrode emitting device.
  • At the end of the sonotrode is an upper guiding element and a lower guiding element, and a cutting element of ultrasound transmitting material fixed to the sonotrode.
  • the lower guiding element is mobile and allows the cutting of the fabrics and the filling fabric. simultaneously to the welding between the same fabrics, along the line of cut.
  • This device has a cutting wheel that causes the fabric to be cut and by means of the sonotrode action the newly cut ends are welded, the cutting and welding being carried out in the same action.
  • the particular configuration of this apparatus makes the cutting line and the welding line coincide, which, due to the small thickness of the edge or edge of the cutting wheel, makes the joints achieved by the apparatus not too consistent since The welding strip is small in width. Description of the invention
  • the closure device of plastic material containers object of the present application deals as far as possible to overcome the different problems raised above.
  • the closure system of plastic material containers proposed by the present invention is especially used for the closure of a plurality of containers, the mouth of each container being surrounded by a peripheral wing in prolongation of its walls, a closure sheet being arranged on said mouth of the container or containers to be closed.
  • the system is based on the use of a plurality of ultrasonic vibration producing equipment used for welding the plastic material, specifically sonotrodes will be used. which are independent of each other and are separated by a small space.
  • Said molds consist of concentric walls located in coincidence with the peripheral wing that surrounds the mouth of the container or containers to be closed.
  • the mold has an internal wall that allows welding between the closure sheet and the peripheral wing of the mouth, said internal wall is finished off in a profile edge or edge of great angular amplitude, that is to say its flanks form an obtuse angle, together to this internal wall and concentrically to it, the mold has another external wall of slightly greater height, finished off in a profile edge or edge of small angular amplitude, that is to say its flanks form a suitable acute angle to cause the cutting of the sheet of closing and of the peripheral wing mentioned to a certain distance of separation variable of the line of welding defined by the inner wall.
  • the outer wall has a greater height than the inner wall allows that when the outer wall has completely cut the closure sheet and the peripheral wing of the container the inner wall has only partially penetrated both without reaching through and raising the temperature at the contact points between said inner wall and the plastic material, which makes that the welding line is internal to the cutting line, the distance being spaced a certain distance, thus achieving a more resistant weld.
  • the internal wall has several configurations in its edge or edge, depending mainly on the thickness of the closing sheet and the peripheral wing of the container to be closed.
  • the internal wall can have a continuous linear edge or edge, although it is possible that it has a discontinuous edge or edge, defining a series of protrusions which can adopt a wide variety of configurations in terms of their shape.
  • the inner wall and the outer wall are jointly joined forming a single wall with a edge or edge of "double" profile, an external cutting profile that will have a configuration as described above and an internal welding profile that It may be continuous or discontinuous.
  • Another embodiment of the invention which is a particular variant of the case in which the internal wall and the external wall form a single wall, includes separation zones located in the wall profile itself, between both profiles and internally to the internal profile. and in parallel to them. In these areas there are two cavities whose function is on the one hand to produce a double welding line and on the other hand to separate the welding lines from the cutting line, with the advantages that this entails, such as increased stiffness of the weld bead and the joint itself and an increase in tightness.
  • Figure 1 shows a exploded perspective view of the different components of the closure device object of the present invention.
  • Figure 2 represents a perspective view of each of the constituent molds of the closure device.
  • Figure 3 shows a large-scale detail of the constituent walls of the mold, according to a first embodiment of the invention.
  • Figure 4 shows a sectional view of the mold, according to a first embodiment of the invention, before starting the cutting and welding process.
  • Figure 5 shows a sectional view of the mold, according to a first embodiment of the invention, once the cutting and welding process is finished.
  • Figure 6 shows a sectioned perspective view of part of the mold, according to a second embodiment of the invention.
  • Figure 7 shows a perspective sectional view of part of the mold, according to a third embodiment of the invention.
  • Figure 8 shows a sectional view of the mold, according to a fourth embodiment of the invention, once the cutting and welding process is finished.
  • the closure device for plastic material containers object of the present invention consists of a plurality of sonotrodes 1 which are independent of each other, below which a Teflon sheet 2 is provided, below of which there is the closing sheet 3 that is arranged just above the container or containers 4 to be closed which in this case are of approximately rectangular configuration and which are presented in two rows joined together by their peripheral wings 5.
  • Both the sheet of Teflon 2 as the closure sheet 3 and the containers 4 rest on molds 6 so that the packages are contained therein, being both the portion of the closing sheet close to the peripheral wing 5 of the packages 4 and the same peripheral wing 5, resting on the edge or edge of the mold wall 6.
  • the molds 6 are supported on a heating plate 7 whose mission is to preheat the molds to improve and accelerate the perfect operation of the device.
  • Figure 2 shows a pair of molds 6 arranged on a heating plate 7. The molds will have a shape similar to the shape of the package
  • the mold is to be composed of two concentric walls located in coincidence with the peripheral wing that surrounds the mouth of the container or containers to be closed.
  • the mold has an internal wall 9 that welds between the closure sheet 3 and the peripheral wing
  • said internal wall 9 is finished off in a profile edge or edge of great angular amplitude, that is to say its flanks form an obtuse angle.
  • the edge or edge 10 of the inner wall 9 is discontinuous and specifically takes the form of a plurality of protrusions 11 aligned with each other and with said inner wall.
  • the mold has another external wall 12, next to this internal wall and concentrically to it, of slightly greater height, finished off in a ridge or edge 13 of profile of small angular amplitude, that is to say its flanks form a suitable acute angle to cause the cutting of the closing sheet 3 and the peripheral wing 5 mentioned at a certain distance from the welding line defined by the inner wall 9.
  • Figure 4 shows a partial section in detail of the cutting and welding area, before the welding process begins, it can be seen how the external wall 12 of the mold is arranged next to the internal wall 9 thereof, perpendicularly to the peripheral wing 5 of the mouth of the container, then, above it, the closure sheet 3 is arranged and above the Teflon sheet 2 on which the sonotrode 1 is placed.
  • Teflon is a non-stick material that does not stick to the plastic material when it is heated, it also withstands a higher temperature than the melting point of said material and transmits ultrasound vibrations very well.
  • the Teflon sheet 2 sandwiched between the sonotrode 1 and the closure sheet 3 is of great importance because thanks to it the following effects are achieved: avoid direct contact between the metals and dampen the noise, prevent the abrasion of the edge or edge of both walls of the mold and therefore its premature wear, attenuate the destructive friction that can cause direct contact of the sonotrode 1 with the closing sheet 3, improve the transmission of vibrations and prevent damage to the Sonotrode 1 by excessive vibration transmitted to it, improve the control of critical conditions between the welding point and the point of destruction.
  • Figure 5 shows a partial section in detail of the cutting and welding area, when the welding and cutting process has occurred, it can be seen how the outer wall 12 of the mold has cut both the closing sheet 3 and the peripheral wing of the mouth of the container 4.
  • the inner wall 9 of the mold has exceeded the thickness of the peripheral wing 5 of the container and has partially penetrated the closure sheet 3, presenting around the edge or edge 10 of the inner wall 9, that this case is configured in the form of protrusions 13 , a zone 14 of molten and mixed plastic material.
  • both walls of the mold 6 are joined together to form a single wall 15, as shown in Figure 6.
  • the edge or edge of the single wall. 15, has a "double" profile, on the one hand it consists of an external profile
  • Said protuberances for this second embodiment of the invention have a serrated shape and are slightly inclined, which gives them a large friction surface that helps the melting of the plastic material.
  • the mold 6 will be special, specifically it will only consist of a wall 19, the edge or edge of the inner wall being transversely extending the edge or edge 20 of the outer wall, being in this case the edge or edge 21 of the discontinuous internal wall.
  • FIG 8 is a particular variant of the case in which the inner wall and the outer wall form a single wall.
  • separation zones are included in the wall of the mold 6, the first zone 24 located between the internal profile 22 and the external profile 23 and the second zone 25 located internally to the internal profile 22.
  • both zones parallel to the mentioned internal and external profiles are both cavities.
  • the closure sheet 3 is arranged and below the peripheral wing 5 of the mouth of the container.
  • the cutting movement and welding has been completed and the plastic material that has been heated by the successive vibrations of the sonotrode 1 (not shown in the figure), becoming melted and deposited in the first zone 24 and in the second zone 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)
  • Closing Of Containers (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Basic Packing Technique (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Closures For Containers (AREA)

Abstract

Sistema de cierre de envases de material plástico para el cierre de envases de embocadura circundada por un ala periférica, que consiste en disponer una lámina de cierre sobre la embocadura del envase a cerrar, apoyar el ala periférica sobre un molde de soldadura, y aplicar sobre la lámina de cierre, en coincidencia con un molde, vibraciones ultrasónicas mediante sonotrodos independientes, comprendiendo dicho molde dos paredes concéntricas situadas en coincidencia con el ala periférica que circunda a la embocadura del envase a cerrar, una interna que permite la soldadura entre la lámina de cierre y el ala periférica de la embocadura, y otra externa, de altura ligeramente mayor, rematada en un canto o borde de perfil angulado para provocar el corte de la lámina de cierre y del ala periférica citada a una cierta distancia variable de la línea de soldadura entre dicha lámina y ala periférica.

Description

DISPOSITIVO DE CIERRE DE ENVASES DE MATERIAL PL STICO Objeto de la invención
La presente invención se refiere un sistema de cierre de envases de material plástico el cual realiza las operaciones de corte y soldadura simultáneamente y que se utiliza para el cierre y corte de envases tipo blister y similares en cadenas continuas de montaje, basándose en la utilización de unos moldes junto con la utilización de un dispositivo emisor de ultrasonido. Antecedentes de la invención
Dada la actual demanda de envases de plástico empleados para contener multitud de productos, es necesario conseguir que los dispositivos de envasado realicen la operación de envasado a la mayor velocidad posible y con bajos costes.
Por ello se han desarrollado una gran variedad de dispositivos para el cierre de este tipo de envases.
Normalmente estos dispositivos son de tipo térmico, es decir que utilizan el calor para fundir el material constituyente de la tapa del envase y unirlo al propio envase. Estos sistemas tienen el inconveniente de que suelen resultar caros debido a la necesidad de aplicar lacas termosoldables en una de las láminas a unir. Además el acabado es de baja calidad produciéndose pliegues y abarquillamientos de los envases cuando se enfrían.
También son conocidos dispositivos de soldado de envases de plástico tipo blister o similares que utilizan el efecto de alta frecuencia para conseguir el calentamiento del material plástico y posteriormente la soldadura del mismo.
En el documento EP-A-0493690 se describe un aparato que se utiliza para soldar una tapa de material plástico a un recipiente con forma de bote, el aparato tiene una herramienta que se engancha al exterior de la tapa o al exterior del recipiente y una herramienta interna que se inserta en la tapa, siendo la herramienta interna un sonotrodo y la herramienta exterior una anillo cónico que se puede desplazar radialmente para conseguir el cierre del recipiente.
Este dispositivo solo tiene la función de soldar una tapa a un recipiente independiente no pudiendo utilizarse para envases tipo blister o para varios recipientes a la vez lo cual no es demasiado interesante puesto que los tiempos de soldado unitarios son altos. Además este dispositivo no cuenta con la posibilidad de cortar simultáneamente el plástico de los envases.
En el documento ES-A-2100777 se describe un dispositivo de corte y soldadura por ultrasonidos, aplicado especialmente a tejidos acolchados que comprende unos medios de desplazamiento, unos medios de fijación de su posición y un dispositivo emisor de ultrasonidos o sonotrodo. En el extremo del sonotrodo se encuentra un elemento de guiado superior y un elemento de guiado inferior, y un elemento de corte de material transmisor de los ultrasonidos fijado al sonotrodo. Además, el elemento de guiado inferior es móvil y permite realizar el corte de las telas y del tejido de relleno simultáneamente a la soldadura entre las mismas telas, a lo largo de la línea de corte. Este dispositivo tiene una rueda de corte que hace que el tej ido sea cortado y por medio de la acción del sonotrodo se suelden los extremos recién cortados, llevándose a cabo el corte y la soldadura en una misma acción. La configuración particular de este aparato hace que la línea de corte y la línea de soldadura sean coincidentes, lo cual, debido al pequeño grosor del canto o borde de la rueda de corte hace que las uniones conseguidas mediante el aparato no sean demasiado consistentes puesto que la franja de soldadura es de pequeña anchura. Descripción de la invención
El dispositivo de cierre de envases de material plástico objeto de la presente solicitud trata en la medida de lo posible de subsanar los diferentes problemas más arriba planteados .
El sistema de cierre de envases de material plástico que propone la presente invención se emplea especialmente para el cierre de una pluralidad de envases estando la embocadura de cada envase circundada por un ala periférica en prolongación de sus paredes, disponiéndose una lámina de cierre sobre dicha embocadura del envase o envases a cerrar. El sistema se basa en la utilización de una pluralidad de equipos productores de vibraciones por ultrasonido empleados para la soldadura del material plástico, concretamente se emplearán sonotrodos, los cuales son independientes entre sí y están separados por un espacio reducido.
Estos sonotrodos emitirán vibraciones sobre la lámina de cierre y el ala periférica que a su vez se apoyan sobre una serie de moldes .
Dichos moldes constan de paredes concéntricas situadas en coincidencia con el ala periférica que circunda a la embocadura del envase o envases a cerrar.
El molde presenta una pared interna que permite la soldadura entre la lámina de cierre y el ala periférica de la embocadura, dicha pared interna esta rematada en un canto o borde de perfil de gran amplitud angular, es decir sus flancos forman un ángulo obtuso, junto a esta pared interna y concéntricamente a la misma, el molde presenta otra pared externa de altura ligeramente mayor, rematada en un canto o borde de perfil de pequeña amplitud angular, es decir sus flancos forman un ángulo agudo idóneo para provocar el corte de la lámina de cierre y del ala periférica citada a una cierta distancia de separación variable de la línea de soldadura definida por la pared interna.
Esta pequeña separación entre la línea de soldadura y la línea de corte hace que la soldadura conseguida por medio de la presente invención, sea consistente y de gran resistencia evitándose el problema que se producía cuando las líneas de corte y soldadura coincidían.
La emisión de una gran cantidad de vibraciones ultrasónicas en un pequeño periodo de tiempo junto con la configuración del perfil del canto o borde de la pared externa, cuyos flancos forman un ángulo agudo, hace que dicha pared externa penetre tanto en la lámina de cierre como en el ala periférica del envase hasta que son finalmente cortadas. El ángulo agudo del canto o borde de la pared externa del molde permite una penetración de la misma en el material plástico, con un rozamiento mínimo y como consecuencia evitando que dicho material plástico se caliente en exceso y se funda.
Por otro lado la emisión de gran cantidad de vibraciones ultrasónicas en un corto periodo de tiempo junto con la configuración del perfil del canto o borde de la pared interna, cuyos flancos forman un ángulo obtuso, hace que dicha pared interna suelde el material plástico y no penetre en el como ocurría con la pared externa. Esto se debe a que la superficie de roce del canto o borde de la pared interna con la lámina de cierre y el ala periférica del envase o envases; es de gran magnitud, haciendo las vibraciones sucesivas que esta energía de roce se convierta en energía calorífica que hace que se funda el material plástico tanto de la lámina de cierre como del ala periférica del envase o envases y se mezclen formando la soldadura.
El hecho de que la pared externa tenga una mayor altura que la pared interna permite que cuando la pared externa ha cortado completamente la lámina de cierre y el ala periférica del envase la pared interna solo haya penetrado parcialmente en ambas sin llegar a atravesarlas y elevando la temperatura en los puntos de contacto entre dicha pared interna y el material plástico, lo que hace que la línea de soldadura sea interior a la línea de corte, estando distanciadas las mismas una cierta distancia consiguiéndose una soldadura más resistente.
La pared interna presenta varias configuraciones en su canto o borde, dependiendo sobretodo de espesor de la lámina de cierre y del ala periférica del envase a cerrar.
Por un lado la pared interna puede presentar un canto o borde lineal continuo, aunque cabe la posibilidad de que presente un canto o borde discontinuo, definiéndose una serie de protuberancias las cuales pueden adoptar gran variedad de configuraciones en lo que a su forma se refiere.
Otra posibilidad es que la pared interna y la pared externa estén solidariamente unidas formando una sola pared con un canto o borde de perfil "doble" , un perfil externo de corte que tendrá una configuración como la descrita más arriba y un perfil interno de soldadura que podrá ser continuo o discontinuo. Otra realización de la invención, que es una variante particular del caso en el que la pared interna y la pared externa formen una sola pared, incluye unas zonas de separación situadas en el propio perfil de la pared, entre ambos perfiles e interiormente al perfil interno y paralelamente a los mismos. En dichas zonas se disponen sendas cavidades cuya función es por un lado la de producir una línea de soldadura doble y por otro lado la de separar las líneas de soldadura de la línea de corte, con las ventajas que esto conlleva, como son un aumento de la rigidez del cordón de soldadura y de la propia unión y un aumento de la hermeticidad.
Por último para los casos en los que tanto la lámina de cierre como el ala periférica sean de pequeño espesor, la configuración que adopta el molde será especial, concretamente solo constará de una pared encontrándose transversalmente el canto o borde de la pared interna en prolongación del canto o borde de la pared externa. Descripción de los dibujos Las características de la presente invención se podrán comprender de una manera más clara con la siguiente descripción, en la que se muestra un ejemplo de realización, acompañándose como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y nunca limitativo, se ha representado lo siguiente:
La figura 1 muestra una vista en perspectiva estallada de los diferentes componentes del dispositivo de cierre objeto de la presente invención. La figura 2 representa una vista en perspectiva de cada uno de los moldes constituyentes del dispositivo de cierre .
La figura 3 muestra un detalle a gran escala de las paredes constituyentes del molde, según una primera realización de la invención.
La figura 4 muestra una vista en sección del molde, según una primera realización de la invención, antes de comenzar el proceso de corte y soldadura. La figura 5 muestra una vista en sección del molde, según una primera realización de la invención, una vez ha finalizado el proceso de corte y soldadura.
La figura 6 muestra una vista seccionada en perspectiva de parte del molde, según una segunda realización de la invención.
La figura 7 nuestra una vista seccionada en perspectiva de parte del molde, según una tercera realización de la invención. La figura 8 muestra una vista en sección del molde, según una cuarta realización de la invención, una vez ha finalizado el proceso de corte y soldadura. Descripción detallada de los dibujos
Como se muestra en la figura 1 el dispositivo de cierre de envases de material plástico objeto de la presente invención consta de una pluralidad de sonotrodos 1 los cuales son independientes entre si, por debajo de los cuales se dispone una lámina de teflón 2, por debajo de la cual está la lámina de cierre 3 que se dispone justo encima del envase o envases 4 a cerrar que en este caso son de configuración aproximadamente rectangular y que se presentan en dos hileras unidos entre si por sus alas periféricas 5. Tanto la lámina de teflón 2 como la lámina de cierre 3 y los envases 4 se apoyan sobre unos moldes 6 de manera que los envases quedan contenidos en los mismos, quedando, tanto la porción de lámina de cierre próxima al ala periférica 5 de los envases 4 como la misma ala periférica 5, apoyadas sobre el canto o borde de la pared del molde 6. Los moldes 6 quedan apoyados sobre una placa calefactora 7 cuya misión es precalentar los moldes para mejorar y acelerar el perfecto funcionamiento del dispositivo. En la figura 2 se muestra un par de moldes 6 dispuestos sobre una placa calefactora 7. Los moldes tendrán una forma similar a la forma del envase o envases
4 a cerrar y unas dimensiones tales, que tanto la lámina de cierre como el ala periférica dispuesta como prolongación en la embocadura del envase se apoyen sobre el borde o canto de las paredes del molde 6. Además la placa calefactora 7 contará con unas aberturas 8 en las que quedará contenido el envase cuando se esté produciendo la operación de cierre del mismo. En una primera realización de la invención, el molde se va a componer de dos paredes concéntricas situadas en coincidencia con el ala periférica que circunda a la embocadura del envase o envases a cerrar.
El molde, presenta una pared interna 9 que realiza la soldadura entre la lámina de cierre 3 y el ala periférica
5 de la embocadura del envase 4, dicha pared interna 9 esta rematada en un canto o borde de perfil de gran amplitud angular, es decir sus flancos forman un ángulo obtuso. En esta primera realización de la invención el canto o borde 10 de la pared interna 9 es discontinuo y adopta concretamente la forma de una pluralidad de protuberancias 11 alineadas entre si y con dicha pared interna . El molde presenta otra pared externa 12, junto a esta pared interna y concéntricamente a la misma, de altura ligeramente mayor, rematada en un canto o borde 13 de perfil de pequeña amplitud angular, es decir sus flancos forman un ángulo agudo idóneo para provocar el corte de la lámina de cierre 3 y del ala periférica 5 citada a una cierta distancia de separación de la línea de soldadura definida por la pared interna 9.
En la figura 4 se aprecia una sección parcial en detalle de la zona de corte y soldadura, antes de que comience el proceso de soldado, se pude apreciar como la pared externa 12 del molde se dispone junto a la pared interna 9 del mismo, perpendicularmente al ala periférica 5 de la embocadura del envase, a continuación, por encima de la misma se dispone la lámina de cierre 3 y por encima la lámina de teflón 2 sobre la que se sitúa el sonotrodo 1.
El teflón es material antiadherente que no se pega al material plástico cuando éste se calienta, además soporta una temperatura más elevada que la del punto de fusión de dicho material y transmite muy bien las vibraciones de ultrasonidos.
La lámina de teflón 2 intercalada entre el sonotrodo 1 y la lámina de cierre 3 es de gran importancia porque gracias a ella se consiguen los siguientes efectos: evitar el contacto directo entre los metales y amortiguar el ruido, impedir la abrasión del canto o borde de ambas paredes del molde y por consiguiente su prematuro desgaste, atenuar la fricción destructiva que puede originar el contacto directo del sonotrodo 1 con la lámina de cierre 3, mejorar la transmisión de las vibraciones y evitan el daño del sonotrodo 1 por una excesiva vibración transmitida al mismo, mejorar el control de las condiciones críticas entre el punto de soldadura y el punto de destrucción.
En la figura 5 se aprecia una sección parcial en detalle de la zona de corte y soldadura, cuando se ha producido el proceso de soldado y corte, se pude apreciar como la pared externa 12 del molde ha cortado tanto la lámina de cierre 3 como el ala periférica de la embocadura del envase 4.
La pared interna 9 del molde ha sobrepasado el espesor del ala periférica 5 del envase y ha penetrado parcialmente en la lámina de cierre 3, presentándose alrededor del canto o borde 10 de la pared interna 9, que este caso está configurado en forma de protuberancias 13, una zona 14 de material plástico fundido y mezclado.
En una segunda realización de la invención ambas paredes del molde 6 se encuentran unidas formado una pared única 15, como se muestra en la figura 6. En este caso el canto o borde de la pared única. 15, tiene un perfil "doble" , por un lado consta de un perfil externo
16 continuo y por otro lado consta de un perfil interno
17 discontinuo, configurado en forma de protuberancias 18. Dichas protuberancias para esta segunda realización de la invención tienen forma dentada y se encuentran inclinadas ligeramente, lo que las confiere una superficie de fricción grande que ayuda a la fusión del material plástico.
En el caso particular de que tanto la lámina de cierre 3 como el ala periférica 5 del envase sean de pequeño espesor se ha pensado en una tercera realización preferente de acuerdo con el objeto de la invención. Como se puede ver en la figura 7 para este caso particular el molde 6 será especial, concretamente solo constará de una pared 19 encontrándose transversalmente el canto o borde de la pared interna en prolongación del canto o borde 20 de la pared externa, siendo en este caso el borde o canto 21 de la pared interna discontinuo.
En la figura 8 se muestra una cuarta realización de la invención, que es una variante particular del caso en el que la pared interna y la pared externa formen una sola pared. En este caso, en la pared del molde 6 se incluyen unas zonas de separación, la primera zona 24 situada entre el perfil interno 22 y el perfil externo 23 y la segunda zona 25 situada interiormente al perfil interno 22. A lo largo de ambas zonas se disponen paralelamente a los mencionados perfiles interno y externo sendas cavidades.
Como se aprecia en la figura 8 por debajo de la lámina de teflón 2, se dispone la lámina de cierre 3 y por debajo el ala periférica 5 de la embocadura del envase. En esta representación el movimiento de corte y soldadura ha finalizado y el material plástico que ha sido calentado por las sucesivas vibraciones del sonotrodo 1 (no representado en la figura) , llegando a fundirse y depositándose en la primera zona 24 y en la segunda zona 25. Con esta disposición de los perfiles que se encuentran separados por las mencionadas zonas se consigue por un lado conseguir una línea de soldadura doble y por otro lado separar las líneas de soldadura de la línea de corte, aumentando la rigidez del cordón de soldadura y de la propia unión y un aumentando también la hermeticidad de la misma.

Claims

REIVINDICACIONES
1. Sistema de cierre de envases de material plástico especialmente para el cierre de envases cuya embocadura está circundada por un ala periférica en prolongación de la pared, que consiste en disponer una lámina de cierre sobre la embocadura del envase o envases a cerrar, apoyar el ala periférica sobre un molde de soldadura, y aplicar sobre la lámina de cierre, en coincidencia con un molde, vibraciones ultrasónicas mediante sonotrodos independientes, caracterizado porque el molde comprende dos paredes concéntricas situadas en coincidencia con el ala periférica que circunda a la embocadura del envase o envases a cerrar, una interna que permite la soldadura entre la lámina de cierre y el ala periférica de la embocadura, y otra externa, de altura ligeramente mayor , rematada en un canto o borde de perfil angulado para provocar el corte de la lámina de cierre y del ala periférica citada a una cierta distancia variable de la línea de soldadura entre dicha lámina y ala periférica.
2. Dispositivo de cierre de envases de material plástico según la reivindicación 1, caracterizado porque la pared interna presenta un canto o borde lineal continuo.
3. Dispositivo de cierre de envases de material plástico según la reivindicación 1, caracterizado porque la pared interna presenta un canto o borde discontinuo.
4. Dispositivo de cierre de envases de material plástico según la reivindicación 1, caracterizado porque la pared interna y la pared externa están separadas y son independientes .
5. Dispositivo de cierre de envases de material plástico según la reivindicación 1, caracterizado porque la pared interna y la pared externa están unidas formando una sola pared.
6.Dispositivo de cierre de envases de material plástico según la reivindicación 3 y la reivindicación 5, caracterizado porque entre el perfil interno y el perfil externo e interiormente al perfil interno se disponen dos zonas paralelas a dichos perfiles a lo largo de las que se disponen cavidades en donde se acumula el material plástico una vez se ha fundido.
7. Dispositivo de cierre de envases de material plástico según la reivindicación 3 y la reivindicación 5, caracterizado porque el canto o borde de la pared interna se encuentra transversalmente en prolongación del canto o borde de la pared externa.
PCT/ES2003/000265 2002-06-05 2003-06-02 Dispositivo de cierre de envases de material plastico WO2003104084A1 (es)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2003232857A AU2003232857A1 (en) 2002-06-05 2003-06-02 Device for closing containers made of plastic
DE60318573T DE60318573T2 (de) 2002-06-05 2003-06-02 Vorrichtung zum schliessen von behältern aus kunststoff
JP2004511168A JP4426441B2 (ja) 2002-06-05 2003-06-02 プラスチック製容器を密封するためのシステム
US10/516,973 US20050155324A1 (en) 2002-06-05 2003-06-02 Device for closing containers made of plastic
EP03757077A EP1510459B1 (en) 2002-06-05 2003-06-02 Device for closing containers made of plastic

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ESP200201290 2002-06-05
ES200201290A ES2224790B1 (es) 2002-06-05 2002-06-05 Dispositivo de cierre de envases de material plastico.

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DE60318573T2 (de) 2009-01-08
EP1510459B1 (en) 2008-01-09
ES2299721T3 (es) 2008-06-01
ES2224790B1 (es) 2006-06-01
JP2005528299A (ja) 2005-09-22
JP4426441B2 (ja) 2010-03-03
EP1510459A1 (en) 2005-03-02
AU2003232857A1 (en) 2003-12-22
US20050155324A1 (en) 2005-07-21
DE60318573D1 (de) 2008-02-21
ATE383311T1 (de) 2008-01-15

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