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WO2020156643A1 - Welding assembly for obtaining continuous weldings for a food packaging machine - Google Patents

Welding assembly for obtaining continuous weldings for a food packaging machine Download PDF

Info

Publication number
WO2020156643A1
WO2020156643A1 PCT/EP2019/052111 EP2019052111W WO2020156643A1 WO 2020156643 A1 WO2020156643 A1 WO 2020156643A1 EP 2019052111 W EP2019052111 W EP 2019052111W WO 2020156643 A1 WO2020156643 A1 WO 2020156643A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
plastic film
folding
welding assembly
profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/052111
Other languages
French (fr)
Inventor
Giuseppe VEZZANI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CyborgLine SA
Original Assignee
CyborgLine SA
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 CyborgLine SA filed Critical CyborgLine SA
Priority to PCT/EP2019/052111 priority Critical patent/WO2020156643A1/en
Publication of WO2020156643A1 publication Critical patent/WO2020156643A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • 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
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7891—Means for handling of moving sheets or webs of discontinuously moving sheets or webs
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • 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
    • B29C66/10—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
    • B29C66/1352—Single hem to hem 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—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
    • B29C66/81421—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 convex or concave
    • B29C66/81423—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 convex or concave being concave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C2053/362—Bending and joining, e.g. for making hollow articles for making hems
    • 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
    • B29L2031/7128—Bags, sacks, sachets
    • 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
    • B65B2220/00—Specific aspects of the packaging operation
    • B65B2220/12—Creating additional longitudinal welds on horizontal or vertical form fill seal [FFS] machines for stiffening packages or for creating package edges
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2042—Means for altering the cross-section of the tube filling opening prior to transversal sealing, e.g. tube spreading devices

Definitions

  • the present invention relates to a welding assembly for obtaining continuous weldings for a food packaging machine.
  • food means long or short pasta, biscuits, rice, sweets, chocolates and more.
  • a type of package currently very appreciated by the consumer is that obtained from plastic film with vertical weldings, i.e. with the side surface having evident welded folds which develop vertically in the final filled package.
  • packages are obtained with vertical weldings (preferably from one to five weldings), with or without a square bottom.
  • the vertical weldings in addition to giving an original appearance which resembles a parallelepiped, allow the package to be reinforced, thus allowing it to be kept standing on the shelves.
  • the packages with vertical weldings are currently obtained in complex packaging machines which comprise a forming tube defining a volume starting from a flat plastic film.
  • the weldings are carried out in the forming tube with a discontinuous process which heavily slows down the production and does not ensure an accurate welding.
  • said welding assembly may be mounted onto known packaging machines.
  • said welding assembly is simple to be manufactured and does not damage the plastic film during the welding operation.
  • an assembly for welding a plastic film for a food packaging machine characterized in that it comprises a folding device and a welding device, the folding device comprises at least one upper folding block and at least one lower folding block facing each other so that the plastic film passes therebetween, said at least one upper folding block and at least one lower folding block having sliding surfaces adapted to obtain a linear fold during the sliding of the plastic film,
  • the welding device comprises at least one welding plate, which is movable between a resting position and a position for welding the linear fold of the plastic film obtained by means of the folding device.
  • the plastic film which is still substantially flat, has linear weldings which will correspond to the vertical weldings of the bag after the forming operation.
  • the welding operation also occurs continuously and simultaneously on several linear sections of the plastic film, before the plastic film itself passes into the forming tube.
  • Figure 1 shows a top plan view of a packaging machine
  • Figure 2 shows a side view of the packaging machine
  • Figure 3 shows a perspective view of a welding assembly according to the present invention
  • Figure 4 shows a top plan view of the welding assembly, with an enlarged detail in circle A;
  • Figure 5 shows a front view of the welding assembly
  • Figure 6 shows a side view of the welding assembly
  • Figure 7 shows a rear view of the welding assembly
  • Figure 8 shows a first perspective view of the welding assembly without a folding device
  • Figure 9 shows a second perspective view of the welding assembly without the folding device
  • Figure 10 shows a side view of the welding assembly without the folding device
  • Figure 11 shows a perspective view of a first package obtained by means of the welding assembly
  • Figure 12 shows a perspective view of a second package obtained by means of the welding assembly.
  • a machine 1 for packaging food such as long or short pasta, biscuits, rice, sweets, chocolates and more, comprises a supporting frame 2 on which a welding assembly 3, operating on a sliding plastic film 50 fed by a coil assembly 40 placed under said welding assembly 3 (figures 1 and 2), is laterally mounted.
  • the welding assembly 3 comprises a folding device 4 and a welding device 5.
  • the welding assembly 3 shown more in detail in figures 3-12, comprises side brackets 6 adapted to be fastened to the frame 2 of the packaging machine 1, and horizontal bars 7 supported by said side brackets 6.
  • the folding device 4 (figures 3-5) is adapted to simultaneously obtain a plurality of linear folds on the plastic film 50, and comprises two side brackets 10 which are integral with said side brackets 6 and rigidly connected to each other by means of two pairs of horizontal bars, a pair of upper horizontal bars 111 and a pair of lower horizontal bars 112.
  • folding blocks are associated with each pair of horizontal bars 111, 112, in particular four upper folding blocks 121 and four lower folding blocks 122.
  • Each upper folding block 121 faces a lower folding block 122 so that the plastic film 50 passes therebetween.
  • Each lower folding block 122 has a sliding surface 13 of the plastic film
  • the first profile 131 is flat while the second profile 132 increases with respect to said first profile 131, i.e. it tends to lift the plastic film 50 with respect to the sliding direction defined by the first profile 131 (see circle A of figure 4).
  • Each upper folding block 121 has a flat sliding surface 14 adapted to face said first profile 131 of the lower folding block 122.
  • the upper folding block 121 further includes an idle roller 150 which rests on said first profile 131, the plastic film 50 sliding between said roller 150 and the first profile 131.
  • the shape and assembly of the folding blocks 121, 122 allows to simultaneously obtain four linear folds of the plastic film 50. It is obviously possible to vary the number of simultaneous linear folds by adding or removing pairs of folding blocks 121, 122.
  • the folding device 4 further comprises arms 82 fastened at one end on the horizontal bars 111, 112, while at a second end of the arms 82 it is provided a roller 83 which connects the two arms 82.
  • the folding device 4 further comprises a central roller 160 fastened to the upper horizontal bars 111 by means of a spacer 11.
  • the welding device 5 as clearly seen in figures 8-10, comprises four welding plates 12 rotatably associated with respective blocks 18 fastened to the horizontal bars 7.
  • Respective hydraulic pistons 19 are adapted to move the welding plates 12 between a resting position and a welding position.
  • the welding assembly 3 further comprises an idle roller 17 and a control roller 15 driven by a motor 16 and adapted to move the plastic film 50 between the folding device 4 and the welding device 5 and then towards a forming tube of the packaging machine 1.
  • control roller 15 draws the plastic film 50 from the roller 83; the plastic film 50 is inserted between the folding blocks 121,
  • the folding device 4 prepares the plastic film 50 for the following welding step in the welding device 5.
  • the roller 15 continuously moves the plastic film 50 with the four folds facing the welding plates 12.
  • the pistons 19 rotate the welding plates 12 from the resting position to the welding position in which the welding plates 12 come into contact with the linear folds of the plastic film 50, thus turning and welding them (on the inner side).
  • a movement for returning the welding plates 12 to the resting position and a subsequent new movement back towards the welding position follow.
  • the welding plates 12 go and move away intermittently to wards/ from the roller 15.
  • the welding plates 12 have a circular arc shape so as to be coupled to the roller 15 with the plastic film 50 interposed.
  • the plastic film 50 still being substantially flat, has four linear weldings which will correspond to the four vertical weldings of the bag after the forming operation.
  • the welding operation also occurs continuously and simultaneously on several linear sections of the plastic film 50, before the plastic film 50 itself passes into the forming tube.
  • the folding and welding steps are controlled by a control unit of the packaging machine to which the user has access.
  • the welding assembly 3 may obtain a variable number of linear weldings, preferably from one to five, based on the number of folding blocks 121, 122 and on the number of welding plates 12.
  • Figures 11, 12 show two packages 100 for short and long pasta obtained by means of a packaging machine 1 comprising said welding assembly 3.
  • Each package 100 includes a bottom 102, a head 103 and a side wall
  • the side wall 104 consists of four portions 141.
  • a flap 105 can be noticed, which ends on head 103 and bottom 102.
  • the packages 100 shown in Figures 11, 12 include four flaps 105, i.e. four linear weldings.
  • the flaps 105 do not protrude, thus facilitating the production of head 103 and bottom 102.
  • the flaps 105 are substantially coplanar with the portions 141 of the side wall 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

It is disclosed a welding assembly (3) for welding a plastic film (50) for a food packaging machine (1), comprising a folding device (4) and a welding device (5). The folding device (4) comprises at least one upper folding block (121) and at least one lower folding block (122) facing each other so that the plastic film (50) passes therebetween. Said at least one upper folding block (121) and at least one lower folding block (122) have sliding surfaces (13, 14) adapted to obtain a linear fold during the sliding of the plastic film (50). The welding device (5) comprises at least one welding plate (12), which is movable between a resting position and a position for welding the linear fold of the plastic film (50) obtained by means of the folding device (4).

Description

“Welding assembly for obtaining continuous weldings for a food packaging machine”.
* * * *
The present invention relates to a welding assembly for obtaining continuous weldings for a food packaging machine.
For example, food means long or short pasta, biscuits, rice, sweets, chocolates and more.
Functional requirements, but also aesthetic demands, have led to a multiplication of packages, with important modifications to the machinery for obtaining and filling the packages.
A type of package currently very appreciated by the consumer is that obtained from plastic film with vertical weldings, i.e. with the side surface having evident welded folds which develop vertically in the final filled package.
In particular, packages are obtained with vertical weldings (preferably from one to five weldings), with or without a square bottom.
The vertical weldings, in addition to giving an original appearance which resembles a parallelepiped, allow the package to be reinforced, thus allowing it to be kept standing on the shelves.
The packages with vertical weldings are currently obtained in complex packaging machines which comprise a forming tube defining a volume starting from a flat plastic film.
The weldings are carried out in the forming tube with a discontinuous process which heavily slows down the production and does not ensure an accurate welding.
Disadvantageously, packages with inaccurate weldings are obtained, which often do not stand up once filled with food.
It is the object of the present invention to provide a welding assembly for obtaining weldings on a plastic film for food packaging machines.
It is a further object of the present invention that said welding assembly may be mounted onto known packaging machines.
It is still a further object of the present invention that said welding assembly is simple to be manufactured and does not damage the plastic film during the welding operation.
According to the invention, said and further objects are achieved by an assembly for welding a plastic film for a food packaging machine, characterized in that it comprises a folding device and a welding device, the folding device comprises at least one upper folding block and at least one lower folding block facing each other so that the plastic film passes therebetween, said at least one upper folding block and at least one lower folding block having sliding surfaces adapted to obtain a linear fold during the sliding of the plastic film,
the welding device comprises at least one welding plate, which is movable between a resting position and a position for welding the linear fold of the plastic film obtained by means of the folding device.
Advantageously, the plastic film, which is still substantially flat, has linear weldings which will correspond to the vertical weldings of the bag after the forming operation.
Like the folding operation, the welding operation also occurs continuously and simultaneously on several linear sections of the plastic film, before the plastic film itself passes into the forming tube.
These and other features of the present invention will become more apparent from the following detailed description of a practical embodiment thereof, shown for non-limiting purposes, in the accompanying drawings, in which:
Figure 1 shows a top plan view of a packaging machine;
Figure 2 shows a side view of the packaging machine;
Figure 3 shows a perspective view of a welding assembly according to the present invention;
Figure 4 shows a top plan view of the welding assembly, with an enlarged detail in circle A;
Figure 5 shows a front view of the welding assembly;
Figure 6 shows a side view of the welding assembly;
Figure 7 shows a rear view of the welding assembly;
Figure 8 shows a first perspective view of the welding assembly without a folding device;
Figure 9 shows a second perspective view of the welding assembly without the folding device;
Figure 10 shows a side view of the welding assembly without the folding device;
Figure 11 shows a perspective view of a first package obtained by means of the welding assembly;
Figure 12 shows a perspective view of a second package obtained by means of the welding assembly.
A machine 1 for packaging food, such as long or short pasta, biscuits, rice, sweets, chocolates and more, comprises a supporting frame 2 on which a welding assembly 3, operating on a sliding plastic film 50 fed by a coil assembly 40 placed under said welding assembly 3 (figures 1 and 2), is laterally mounted.
The welding assembly 3 comprises a folding device 4 and a welding device 5.
The welding assembly 3, shown more in detail in figures 3-12, comprises side brackets 6 adapted to be fastened to the frame 2 of the packaging machine 1, and horizontal bars 7 supported by said side brackets 6.
The folding device 4 (figures 3-5) is adapted to simultaneously obtain a plurality of linear folds on the plastic film 50, and comprises two side brackets 10 which are integral with said side brackets 6 and rigidly connected to each other by means of two pairs of horizontal bars, a pair of upper horizontal bars 111 and a pair of lower horizontal bars 112.
Four folding blocks are associated with each pair of horizontal bars 111, 112, in particular four upper folding blocks 121 and four lower folding blocks 122.
Each upper folding block 121 faces a lower folding block 122 so that the plastic film 50 passes therebetween.
Each lower folding block 122 has a sliding surface 13 of the plastic film
50 comprising a first profile 131 and a second profile 132.
The first profile 131 is flat while the second profile 132 increases with respect to said first profile 131, i.e. it tends to lift the plastic film 50 with respect to the sliding direction defined by the first profile 131 (see circle A of figure 4).
Each upper folding block 121 has a flat sliding surface 14 adapted to face said first profile 131 of the lower folding block 122.
The upper folding block 121 further includes an idle roller 150 which rests on said first profile 131, the plastic film 50 sliding between said roller 150 and the first profile 131.
The shape and assembly of the folding blocks 121, 122 allows to simultaneously obtain four linear folds of the plastic film 50. It is obviously possible to vary the number of simultaneous linear folds by adding or removing pairs of folding blocks 121, 122.
The folding device 4 further comprises arms 82 fastened at one end on the horizontal bars 111, 112, while at a second end of the arms 82 it is provided a roller 83 which connects the two arms 82.
The folding device 4 further comprises a central roller 160 fastened to the upper horizontal bars 111 by means of a spacer 11.
The welding device 5, as clearly seen in figures 8-10, comprises four welding plates 12 rotatably associated with respective blocks 18 fastened to the horizontal bars 7.
Respective hydraulic pistons 19 are adapted to move the welding plates 12 between a resting position and a welding position.
The welding assembly 3 further comprises an idle roller 17 and a control roller 15 driven by a motor 16 and adapted to move the plastic film 50 between the folding device 4 and the welding device 5 and then towards a forming tube of the packaging machine 1.
As for the operation, the control roller 15 draws the plastic film 50 from the roller 83; the plastic film 50 is inserted between the folding blocks 121,
122 pressed by the roller 160.
The lifting of the second profile 132 with respect to the flat development of the first profile 131 and of the sliding surface 14 of the upper folding block 121 results in the continuous linear fold of linear portions of plastic film 50 (circle A of Figure 4).
In the embodiment shown in the drawings, four linear folds are simultaneously obtained, the number of folds varying based on the number of pairs of folding blocks 121, 122.
The folding device 4 prepares the plastic film 50 for the following welding step in the welding device 5.
The roller 15 continuously moves the plastic film 50 with the four folds facing the welding plates 12.
At predetermined time intervals, the pistons 19 rotate the welding plates 12 from the resting position to the welding position in which the welding plates 12 come into contact with the linear folds of the plastic film 50, thus turning and welding them (on the inner side). A movement for returning the welding plates 12 to the resting position and a subsequent new movement back towards the welding position follow. The welding plates 12 go and move away intermittently to wards/ from the roller 15.
The welding plates 12 have a circular arc shape so as to be coupled to the roller 15 with the plastic film 50 interposed.
Advantageously, the plastic film 50, still being substantially flat, has four linear weldings which will correspond to the four vertical weldings of the bag after the forming operation.
Like the folding operation, the welding operation also occurs continuously and simultaneously on several linear sections of the plastic film 50, before the plastic film 50 itself passes into the forming tube.
The folding and welding steps are controlled by a control unit of the packaging machine to which the user has access.
The welding assembly 3 may obtain a variable number of linear weldings, preferably from one to five, based on the number of folding blocks 121, 122 and on the number of welding plates 12.
Figures 11, 12 show two packages 100 for short and long pasta obtained by means of a packaging machine 1 comprising said welding assembly 3.
Each package 100 includes a bottom 102, a head 103 and a side wall
104.
The side wall 104 consists of four portions 141.
Between two adjacent portions 141, a flap 105 can be noticed, which ends on head 103 and bottom 102.
The packages 100 shown in Figures 11, 12 include four flaps 105, i.e. four linear weldings.
Advantageously, the flaps 105 do not protrude, thus facilitating the production of head 103 and bottom 102.
The flaps 105 are substantially coplanar with the portions 141 of the side wall 4.

Claims

1. Welding assembly (3) for welding a plastic film (50) for a food packaging machine (1), characterized in that it comprises a folding device (4) and a welding device (5),
the folding device (4) comprises at least one upper folding block (121) and at least one lower folding block (122) facing each other so that the plastic film (50) passes therebetween, said at least one upper folding block (121) and at least one lower folding block (122) having sliding surfaces (13, 14) adapted to obtain a linear fold during the sliding of the plastic film (50),
the welding device (5) comprises at least one welding plate (12), which is movable between a resting position and a position for welding the linear fold of the plastic film (50) obtained by means of the folding device (4).
2. Welding assembly (3) according to claim 1, characterized in that the sliding surface (13) of the lower folding block (122) comprises a first profile (131) and a second profile (132), the second profile (132) being increasing with respect to said first profile (131) so as to lift the plastic film (50) with respect to the sliding direction defined by the first profile (131).
3. Welding assembly (3) according to claim 2, characterized in that the sliding surface (14) of the upper folding block (121) faces and is parallel to said first profile (131).
4. Welding assembly (3) according to any one of the preceding claims, characterized in that the welding plate (12) is rotatably associated with a block (18), a hydraulic piston (19) being adapted to move the welding plate (12) between the resting position and the welding position.
5. Welding assembly (3) according to any one of the preceding claims, characterized in that it comprises side brackets (6) adapted to be fastened to the frame (2) of the packaging machine (1), and horizontal bars (7) supported by said side brackets (6),
said folding device (4) comprises two side brackets (10) which are integral with said side brackets (6) and rigidly connected to each other by means of a pair of upper horizontal bars (111) and a pair of lower horizontal bars (112), said upper folding block (121) being fastened to said pair of upper horizontal bars (111) and said lower folding block (122) being fastened to said pair of lower horizontal bars (112).
6. Welding assembly (3) according to any one of the preceding claims, characterized in that it comprises a plurality of upper folding blocks (121) and of lower folding blocks (122) having sliding surfaces (13, 13) adapted to simultaneously obtain a plurality of linear folds during the sliding of the plastic film (50), the welding device (5) comprising a plurality of welding plates (12) for said plurality of linear folds.
7. Food packaging machine (1) comprising a supporting frame (2) and a spool assembly (40), characterized in that it comprises a welding assembly (3) according to any one of the preceding claims.
PCT/EP2019/052111 2019-01-29 2019-01-29 Welding assembly for obtaining continuous weldings for a food packaging machine Ceased WO2020156643A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/052111 WO2020156643A1 (en) 2019-01-29 2019-01-29 Welding assembly for obtaining continuous weldings for a food packaging machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2019/052111 WO2020156643A1 (en) 2019-01-29 2019-01-29 Welding assembly for obtaining continuous weldings for a food packaging machine

Publications (1)

Publication Number Publication Date
WO2020156643A1 true WO2020156643A1 (en) 2020-08-06

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ID=65276147

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/052111 Ceased WO2020156643A1 (en) 2019-01-29 2019-01-29 Welding assembly for obtaining continuous weldings for a food packaging machine

Country Status (1)

Country Link
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009139618A1 (en) * 2008-05-16 2009-11-19 Pmb-Uva International B.V. Device for packaging products in a foil package
WO2013177773A1 (en) * 2012-05-31 2013-12-05 The Procter & Gamble Company Non-contact heat corner seal apparatus and methods of use thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009139618A1 (en) * 2008-05-16 2009-11-19 Pmb-Uva International B.V. Device for packaging products in a foil package
WO2013177773A1 (en) * 2012-05-31 2013-12-05 The Procter & Gamble Company Non-contact heat corner seal apparatus and methods of use thereof

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