IT202100022691A1 - WELDING MACHINE FOR PRODUCT PACKAGES WRAPPED IN HEAT-SEALABLE FILM - Google Patents

WELDING MACHINE FOR PRODUCT PACKAGES WRAPPED IN HEAT-SEALABLE FILM Download PDF

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Publication number
IT202100022691A1
IT202100022691A1 IT102021000022691A IT202100022691A IT202100022691A1 IT 202100022691 A1 IT202100022691 A1 IT 202100022691A1 IT 102021000022691 A IT102021000022691 A IT 102021000022691A IT 202100022691 A IT202100022691 A IT 202100022691A IT 202100022691 A1 IT202100022691 A1 IT 202100022691A1
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IT
Italy
Prior art keywords
sealing
rollers
machine according
roller
welding
Prior art date
Application number
IT102021000022691A
Other languages
Italian (it)
Inventor
Luca Frasnetti
Original Assignee
Koerber Tissue S P A
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 Koerber Tissue S P A filed Critical Koerber Tissue S P A
Priority to IT102021000022691A priority Critical patent/IT202100022691A1/en
Publication of IT202100022691A1 publication Critical patent/IT202100022691A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/245—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool the heat transfer being achieved contactless, e.g. by radiation
    • 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
    • B29C65/7861—In-line machines, i.e. feeding, joining and discharging are in one production line
    • B29C65/787—In-line machines, i.e. feeding, joining and discharging are in one production line using conveyor belts or conveyor chains
    • 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
    • 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
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • B29C66/812—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
    • B29C66/81433—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
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B29C66/81812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws the welding jaws being cooled from the outside, e.g. by blowing a gas or spraying a liquid
    • 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
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • 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
    • B29C66/841—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8412—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height
    • 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
    • B29C66/841—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8412—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height
    • B29C66/84123—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height of different height
    • 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
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/06—Wrapping articles, or quantities of material, by conveying wrapper and contents in common defined paths
    • B65B11/18—Wrapping articles, or quantities of material, by conveying wrapper and contents in common defined paths in two or more straight paths
    • B65B11/20—Wrapping articles, or quantities of material, by conveying wrapper and contents in common defined paths in two or more straight paths to fold the wrappers in tubular form about contents
    • B65B11/22—Wrapping articles, or quantities of material, by conveying wrapper and contents in common defined paths in two or more straight paths to fold the wrappers in tubular form about contents and then to form closing folds of similar form at opposite ends of the tube
    • 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
    • B65B25/00—Packaging other articles presenting special problems
    • B65B25/14—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form
    • B65B25/146—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form packaging rolled-up articles
    • 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
    • B65B51/16—Applying or generating heat or pressure or combinations thereof by rotary members
    • 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
    • B65B51/227—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 induction 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
    • 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
    • B65B2051/105—Heat seal temperature control

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Basic Packing Technique (AREA)

Description

MACCHINA DI SALDATURA PER CONFEZIONI DI PRODOTTI AVVOLTI IN FILM TERMOSALDABILI WELDING MACHINE FOR PRODUCT PACKAGES WRAPPED IN HEAT-SEALABLE FILM

Descrizione Description

Campo tecnico Technical field

[0001] La presente invenzione si riferisce al settore degli apparati per la saldatura di confezioni di prodotti avvolti in film termosaldabile, e pi? in particolare ha per oggetto una macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili, preferibilmente, ma non esclusivamente, per confezioni di prodotti cartacei. [0001] The present invention refers to the sector of apparatus for sealing product packages wrapped in heat-sealable film, and more in particular, it relates to a sealing machine for packages of products wrapped in heat-sealable films, preferably, but not exclusively, for packages of paper products.

Stato della tecnica State of the art

[0002] Come ? noto, confezioni di prodotti, come ad esempio prodotti in carta tissue, come in particolare rotoli di carta igienica, rotoli asciugatutto, tovaglioli di carta, fazzoletti o simili, vengono realizzate disponendo i prodotti in gruppi all?interno di un avvolgimento realizzato in film plastico termosaldabile. [0002] How? known, packages of products, such as for example tissue paper products, such as in particular rolls of toilet paper, kitchen towel rolls, paper napkins, handkerchiefs or the like, are made by arranging the products in groups inside a wrapping made of plastic film heat sealable.

[0003] Alcune macchine per realizzare queste confezioni prevedono una fasciatura del gruppo di prodotti di forma sostanzialmente parallelepipeda e piegando successivamente i lembi laterali del film contro le basi della confezione tramite un sistema di profili di piegatura. La confezione ottenuta dalla macchina deve essere saldata per stabilizzare i lembi laterali ripiegati del foglio di materiale termoplastico. [0003] Some machines for making these packages envisage wrapping the group of substantially parallelepiped-shaped products and subsequently folding the lateral edges of the film against the bases of the package using a system of folding profiles. The package obtained from the machine must be sealed to stabilize the folded side edges of the sheet of thermoplastic material.

[0004] Per far questo, si possono utilizzare dispositivi di saldatura che utilizzano normalmente resistenze elettriche per generare calore, associate ad un sistema di cinghie di trasporto disposte ai lati di un percorso di avanzamento della confezione. [0004] To do this, sealing devices can be used which normally use electric resistances to generate heat, associated with a system of conveyor belts arranged on the sides of a path of advancement of the package.

[0005] In altre macchine, il riscaldamento del film plastico per realizzare la saldatura pu? prevedere delle soffianti di aria calda. [0005] In other machines, heating the plastic film to make the seal can provide hot air blowers.

[0006] ? nota altres? un dispositivo per saldare confezioni di prodotti avvolti in fogli di materiale termoplastico, comprendente un sistema di avanzamento delle confezioni lungo un percorso di avanzamento e, lungo detto percorso, rulli saldanti contrapposti per eseguire la saldatura dei fogli di materiale termoplastico, in cui tali rulli saldanti sono riscaldati per induzione. Pi? in particolare, il riscaldamento viene ottenuto per effetto delle correnti indotte nei rulli saldanti da una variazione nel tempo del campo magnetico. Questa variazione ? ottenuta alimentando una tensione alternata in un avvolgimento primario applicato ad un nucleo ferromagnetico associato a ciascun rullo saldante. Tale dispositivo ? descritto nella domanda di brevetto PCT/IB2018/058789. [0006] ? also note? a device for sealing packages of products wrapped in sheets of thermoplastic material, comprising a system for advancing the packages along a path of advancement and, along said path, opposite sealing rollers for sealing the sheets of thermoplastic material, in which said sealing rollers are heated by induction. Pi? in particular, the heating is obtained due to the effect of the currents induced in the sealing rollers by a variation of the magnetic field over time. This variation? obtained by feeding an alternating voltage in a primary winding applied to a ferromagnetic core associated with each sealing roller. Such a device? described in patent application PCT/IB2018/058789.

[0007] Tale dispositivo ha ottenuto degli ottimi risultati applicativi ma non ? scevro da perfezionamenti. [0007] This device has obtained excellent application results, but has not? free from refinements.

[0008] Perfezionamenti possono riguardare la necessit? di tendere ad un costante miglioramento delle performance di funzionamento, come ad esempio l?ottenimento di saldature di sempre maggior qualit?, tempi di lavorazione pi? brevi, manutenzione ridotta, flessibilit? operativa e costruzione semplificata dei dispositivi. [0008] Improvements can relate to the need? to tend to a constant improvement of the operating performance, such as for example the obtaining of welds of ever greater quality?, working times more? short, low maintenance, flexibility? operation and simplified construction of the devices.

Sommario Summary

[0009] Scopo della presente invenzione, ? quello di realizzare una macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili che sia strutturalmente semplice consentendo al contempo di realizzare saldature di particolare qualit? su confezioni di prodotti avvolti in film termosaldabile. [0009] The object of the present invention is is to create a sealing machine for packaging of products wrapped in heat-sealable film that is structurally simple while allowing for particularly high quality seals? on product packages wrapped in heat-sealable film.

[0010] Altro importante scopo della presente invenzione, ? quello di realizzare una macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili che sia flessibile nell?utilizzo, potendosi ad esempio adattare facilmente a confezioni di prodotti di varia misura. [0010] Another important object of the present invention is that of realizing a sealing machine for product packages wrapped in heat-sealable film which is flexible in use, for example being able to easily adapt to product packages of various sizes.

[0011] Ancora un importante scopo della presente invenzione, ? quello di realizzare una macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili che consenta un?alta produttivit?. [0011] Another important object of the present invention is that of realizing a sealing machine for packaging of products wrapped in heat-sealable film which allows for high productivity.

[0012] Non ultimo importante scopo della presente invenzione, ? quello di realizzare una macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili che preveda tempi di manutenzione ridotti rispetto a macchine analoghe note. [0012] Not the least important object of the present invention is that of realizing a sealing machine for packages of products wrapped in heat-sealable films which envisages reduced maintenance times compared to similar known machines.

[0013] Questi ed altri scopi, che saranno pi? chiari in seguito, sono raggiunti con una macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili, comprendente un apparato di alimentazione di confezioni di prodotti lungo una direzione di avanzamento, almeno una coppia di rulli di saldatura disposti da parti opposte di detta direzione di avanzamento, tra i quali vengono fatte avanzare le confezioni di prodotti per eseguire la saldatura dei film termosaldabili ed in cui detti rulli sono scaldati per induzione; la peculiarit? della macchina risiede nel fatto che la superfice di saldatura di almeno un detto rullo di saldatura ? goffrata. [0013] These and other purposes, which will be more? explained below, are achieved with a sealing machine for packs of products wrapped in heat-sealable films, comprising an apparatus for feeding packs of products along an advancement direction, at least one pair of sealing rollers arranged on opposite sides of said feed direction advancement, between which the product packages are advanced to carry out the welding of the heat-sealable films and in which said rollers are heated by induction; the peculiarity? of the machine lies in the fact that the sealing surface of at least one said sealing roller ? embossed.

[0014] La macchina si pu? ben applicare a qualsiasi tipo di confezione di film termosaldabile, pi? preferibilmente a confezioni di prodotti cellulosici, ad esempio in carta tissue, come tovaglioli, fazzoletti e rotoli di carta. [0014] Can the machine be well apply to any type of heat-sealable film package, pi? preferably to packages of cellulosic products, for example in tissue paper, such as napkins, handkerchiefs and rolls of paper.

[0015] La superfice di saldatura goffrata, che viene specificamente riscaldata per induzione, consente di ottenere una distribuzione del calore particolarmente efficiente su parti del rullo preposte alla sola saldatura ottenendo un risultato di saldatura ottimale, eventualmente anche con minor dispendio di energia rispetto a superfici del rullo completamente lisce. [0015] The embossed welding surface, which is specifically heated by induction, makes it possible to obtain a particularly efficient heat distribution on parts of the roller intended only for welding, obtaining an optimal welding result, possibly even with less expenditure of energy compared to surfaces of the roller completely smooth.

[0016] Inoltre la goffratura consente di aumentare localmente la pressione di saldatura e, cosa non trascurabile, di poter eventualmente definire dei disegni sulla saldatura, che possono avere sia funzione tecnica, come ad esempio disegni che conferiscono particolari effetti di rigidezza o di elasticit? od ancora di facilit? all?apertura, o funzioni estetiche/commerciali. [0016] Furthermore, embossing allows the welding pressure to be locally increased and, which is not negligible, to possibly be able to define designs on the welding, which can have both a technical function, such as for example designs that give particular effects of stiffness or elasticity or even ease? at the opening, or aesthetic/commercial functions.

[0017] Opportunamente, la superfice di saldatura goffrata dell?almeno un rullo di saldatura pu? essere dotata di un trattamento antiaderente, preferibilmente un trattamento al teflon. [0017] Conveniently, the embossed sealing surface of the at least one sealing roller can be equipped with a non-stick treatment, preferably a Teflon treatment.

[0018] Vantaggiosamente, il riscaldamento ad induzione pu? avvenire mediante almeno un dispositivo di induzione elettromagnetica esterno, ovvero affacciato, ad un rispettivo, od entrambi, i rulli di saldatura, collegato ad un generatore per alimentare il dispositivo di induzione elettromagnetica con correnti di induzione elettromagnetica atte a generare un flusso elettromagnetico diretto verso almeno un detto rullo di saldatura, per cui si generano correnti parassite su detto un rispettivo, od entrambi, i rulli di saldatura. In pratica l?almeno un rullo di saldatura non fa parte del dispositivo di induzione, come nei casi gi? noti. [0018] Advantageously, induction heating can take place by means of at least one external electromagnetic induction device, i.e. facing, a respective, or both, the welding rollers, connected to a generator to power the electromagnetic induction device with electromagnetic induction currents capable of generating an electromagnetic flux directed towards at least a said welding roller, whereby eddy currents are generated on said respective one, or both, of the welding rollers. In practice, the at least one welding roller is not part of the induction device, as in the cases already notice.

[0019] Tale configurazione vantaggiosa consente di ottenere una struttura particolarmente compatta e semplificata della macchina, che ne consente una particolare facilit? costruttiva, flessibilit? configurativa e velocit? di funzionamento, nonch? un miglior controllo termico della superfice di saldatura. [0019] This advantageous configuration allows to obtain a particularly compact and simplified structure of the machine, which allows it to be particularly easy to use. constructive, flexibility? configuration and speed? of operation, as well as? better thermal control of the welding surface.

[0020] In tale configurazione, preferibilmente la frequenza operativa delle correnti di induzione elettromagnetica ? atta a generare correnti parassite sull? almeno un rullo di saldatura tali da seguire prevalentemente il profilo della superficie esterna goffrata di detto rullo di saldatura. [0020] In this configuration, preferably the operating frequency of the electromagnetic induction currents ? designed to generate eddy currents on the at least one sealing roller such as to mainly follow the profile of the embossed outer surface of said sealing roller.

[0021] Preferibilmente, le correnti parassite seguono solo o prevalentemente le protuberanze di goffratura dell?almeno un rullo di saldatura. [0021] Preferably, the eddy currents follow only or mainly the embossing protuberances of the at least one sealing roller.

[0022] Preferibilmente, la frequenza operativa della corrente di induzione elettromagnetica ? compresa tra 10 Hz e 500kHz, preferibilmente tra 100 Hz e 100 KHz. [0022] Preferably, the operating frequency of the electromagnetic induction current ? between 10Hz and 500kHz, preferably between 100Hz and 100KHz.

[0023] Secondo forme realizzative preferite, l?apparato di alimentazione di confezioni comprende un nastro trasportatore inferiore e i rulli di saldatura presentano assi di rotazione ortogonali a tale nastro trasportatore inferiore, preferibilmente orientati verticalmente. [0023] According to preferred embodiments, the package feeding apparatus comprises a lower conveyor belt and the sealing rollers have rotation axes perpendicular to this lower conveyor belt, preferably oriented vertically.

[0024] Secondo forme realizzative preferite, la macchina di saldatura comprende un sistema di raffreddamento ad aria dei rulli di saldatura che consente di poter intervenire velocemente sul dispositivo in caso di fremo macchina, emergenza od altre necessit? operative. [0024] According to preferred embodiments, the welding machine comprises an air cooling system for the welding rollers which allows quick intervention on the device in the event of a machine breakdown, emergency or other needs. operational.

[0025] Secondo forme realizzative preferite, la macchina di saldatura comprende un apparato di regolazione della distanza trasversale dei rulli di saldatura, che consente pertanto di adattare la macchina al formato delle confezioni. [0025] According to preferred embodiments, the sealing machine comprises an apparatus for regulating the transversal distance of the sealing rollers, which therefore allows the machine to be adapted to the format of the packages.

[0026] Secondo forme realizzative preferite, la macchina di saldatura comprende un sistema di spinta trasversale dei rulli di saldatura uno verso l?altro al fine di realizzare la corretta pressione di saldatura sulle confezioni. [0026] According to preferred embodiments, the sealing machine comprises a transversal thrust system of the sealing rollers towards each other in order to achieve the correct sealing pressure on the packages.

Breve descrizione dei disegni Brief description of the drawings

[0027] L?invenzione verr? meglio compresa seguendo la descrizione e gli allegati disegni, che illustrano una forma di realizzazione esemplificativa e non limitativa dell?invenzione. Pi? in particolare, nel disegno: [0027] The invention will come better understood by following the description and accompanying drawings, which illustrate an exemplary and non-limiting embodiment of the invention. Pi? in particular, in the drawing:

la Fig. 1 rappresenta una vista prospettica della macchina di saldatura secondo l?invenzione; Fig. 1 is a perspective view of the welding machine according to the invention;

la Fig.2 rappresenta una vista frontale della macchina di saldatura di figura 1; Fig.2 represents a front view of the welding machine of Fig. 1;

la Fig.3 rappresenta una vista dall?alto della macchina di saldatura di figura 1; Fig.3 represents a top view of the welding machine of Fig. 1;

la Fig.4 rappresenta una vista dal basso della macchina di saldatura di figura 1; Fig.4 represents a bottom view of the welding machine of Fig. 1;

la Fig.5 rappresenta una vista in sezione assiale di un rullo di saldatura della macchina delle figure precedenti; Fig.5 represents an axial sectional view of a sealing roller of the machine of the previous figures;

la Fig.6 rappresenta una vista frontale schematica di una porzione di superfice goffrata di un rullo delle figure precedenti. Fig.6 represents a schematic front view of a portion of the embossed surface of a roller of the previous figures.

Descrizione dettagliata di forme di realizzazione Detailed description of embodiments

[0028] Con riferimento alle figure precedentemente citate, una macchina di saldatura per confezioni/pacchi di prodotti avvolti in film termosaldabili, viene complessivamente indicata con il numero 10. [0028] With reference to the previously cited figures, a sealing machine for packages/packs of products wrapped in heat-sealable film is indicated as a whole with the number 10.

[0029] Tale macchina 10 comprende un apparato 11 di alimentazione di confezioni di prodotti lungo una direzione di avanzamento X, come ad esempio un nastro trasportatore inferiore 12 su cui poggiano le confezioni C da saldare. [0029] This machine 10 comprises an apparatus 11 for feeding product packages along an advance direction X, such as for example a lower conveyor belt 12 on which the packages C to be sealed rest.

[0030] In questo esempio la confezione/pacco C rappresentata schematicamente, riguarda ad esempio due rotoli di carta tissue, ed il film plastico F termosaldabile della confezione ? schematizzato da linee tratto-punto. [0030] In this example, the package/pack C represented schematically, concerns for example two rolls of tissue paper, and the heat-sealable plastic film F of the package ? schematized by dash-dot lines.

[0031] La macchina si pu? ben applicare a qualsiasi tipo di confezione di film termosaldabile, pi? preferibilmente a confezioni di prodotti cellulosici, ad esempio in carta tissue, come tovaglioli, fazzoletti e rotoli di carta. [0031] Can the machine be well apply to any type of heat-sealable film package, pi? preferably to packages of cellulosic products, for example in tissue paper, such as napkins, handkerchiefs and rolls of paper.

[0032] Ad esempio, l?apparato di alimentazione 11 movimenta le confezioni C da saldare da una stazione di confezionamento, indicata schematicamente con 13, ad esempio come quelle descritte nei documenti brevettuali IT1426528, EP2766266, EP1228966), le cui descrizioni sono considerate qui incorporate per riferimento. [0032] For example, the feed apparatus 11 moves the packages C to be sealed from a packaging station, indicated schematically with 13, for example such as those described in the patent documents IT1426528, EP2766266, EP1228966), the descriptions of which are considered here incorporated by reference.

[0033] La macchina 10 comprende una coppia di rulli di saldatura 14, in questo esempio ad asse di rotazione ortogonale al nastro trasportatore inferiore 12, ovvero ad asse verticale, disposti lateralmente al nastro trasportatore 12, ossia da parti opposte alla direzione di avanzamento X. Tra tali rulli 14 vengono fatte avanzare le confezioni C di prodotti per eseguire la saldatura dei film termosaldabili delle confezioni. Le superfici cilindriche esterne 15 dei rulli 14 sono riscaldate e vanno a contatto, con una opportuna pressione, contro i fianchi contrapposti delle confezioni, realizzando la saldatura. La rotazione w dei rulli 14 ? tale da movimentare le confezioni nella direzione X. Pertanto, opportunamente, la macchina di saldatura 10 comprende un sistema 30 di spinta trasversale dei rulli di saldatura 14 uno verso l?altro al fine di realizzare la corretta pressione di saldatura sulle confezioni, meglio descritto pi? avanti. [0033] The machine 10 comprises a pair of sealing rollers 14, in this example with an axis of rotation orthogonal to the lower conveyor belt 12, or with a vertical axis, arranged laterally to the conveyor belt 12, i.e. on opposite sides to the direction of advancement X The packages C of products are advanced between these rollers 14 in order to seal the heat-sealable films of the packages. The external cylindrical surfaces 15 of the rollers 14 are heated and come into contact, with a suitable pressure, against the opposite sides of the packages, realizing the sealing. The rotation w of reels 14 ? such as to move the packages in the X direction. Therefore, the sealing machine 10 conveniently comprises a system 30 for transverse thrusting of the sealing rollers 14 towards each other in order to achieve the correct sealing pressure on the packages, better described below ? after you.

[0034] Il riscaldamento dei rulli di saldatura 14 avviene mediante uno o pi? dispositivi di induzione elettromagnetica 16, esterni, ovvero affacciati, ai rispettivi rulli di saldatura 14. Ad esempio, ciascun dispositivo di induzione elettromagnetica 16 comprende una spira (o pi? spire) di induzione 17 (o altro organo induttore capace di generare un flusso elettromagnetico in relazione a correnti di induzione che lo attraversano) disposta in vicinanza della superfice cilindrica di saldatura del rispettivo rullo 14, ad esempio dalla parte opposta del rullo rispetto alla zona di saldatura. [0034] The heating of the sealing rollers 14 takes place by one or more? electromagnetic induction devices 16, external, i.e. facing, the respective welding rollers 14. For example, each electromagnetic induction device 16 comprises an induction coil (or coils) 17 (or other inducing member capable of generating an electromagnetic flux in relation to induction currents passing through it) arranged in the vicinity of the cylindrical welding surface of the respective roller 14, for example on the opposite side of the roller with respect to the welding area.

[0035] Alla spira di induzione 17 ? associato un generatore o inverter, schematizzato da un riquadro tratteggiato indicato con 18, per alimentare il dispositivo di induzione elettromagnetica con correnti di induzione elettromagnetica atte a generare un flusso elettromagnetico diretto alla spira 17 e quindi verso il rullo di saldatura 14, per cui si generano correnti parassite sul rullo 14. [0035] To the induction loop 17 ? associated with a generator or inverter, schematized by a dotted box indicated by 18, to feed the electromagnetic induction device with electromagnetic induction currents suitable for generating an electromagnetic flux directed to the loop 17 and therefore towards the welding roller 14, whereby eddy currents on roller 14.

[0036] Da notare che i rulli 14 non fanno parte del dispositivo di induzione magnetica 16. [0036] It should be noted that the rollers 14 are not part of the magnetic induction device 16.

[0037] Possono essere presenti una o pi? spire 17 per ciascun rullo 14, le quali possono essere connesse ad un comune generatore o inverter 18, oppure le spire di induzione associate a ciascun rullo sono connesse ad un proprio generatore 18 e possono lavorare in modo eventualmente indipendente una rispetto all?altra. [0037] Can there be one or more? coils 17 for each roller 14, which can be connected to a common generator or inverter 18, or the induction coils associated with each roller are connected to their own generator 18 and can possibly work independently of each other.

[0038] In una configurazione, per regolare la temperatura desiderata sulla superficie del rullo di saldatura 14 si realizza un sistema di controllo ad anello chiuso composto da almeno un sensore di temperatura di qualsiasi tipo, quali termocoppie, pirometri, termo-camere o altro dispositivo idoneo, associato ad un rispettivo rullo, e collegato ad una unit? di controllo che in base ad un opportuno algoritmo di controllo comanda il generatore 18 in modo da stabilizzare sulla superficie esterna dei rulli la temperatura. L?unit? di controllo pu? essere un PLC, un computer industriale, un microprocessore, una rete di computer o un qualunque altro dispositivo noto similare. [0038] In one configuration, in order to regulate the desired temperature on the surface of the sealing roller 14, a closed-loop control system is implemented consisting of at least one temperature sensor of any type, such as thermocouples, pyrometers, thermo-cameras or other devices suitable, associated with a respective roller, and connected to a unit? control system which, on the basis of a suitable control algorithm, commands the generator 18 so as to stabilize the temperature on the outer surface of the rollers. The unit control can? be a PLC, an industrial computer, a microprocessor, a computer network or any other similar known device.

[0039] I generatori 18 possono essere degli inverter che operano ad una frequenza di funzionamento ben precisa circa uguale alla frequenza di risonanza del circuito elettrico formato dalla spira di induzione elettromagnetica con l?uscita dell?inverter stesso. [0039] The generators 18 can be inverters which operate at a precise operating frequency approximately equal to the resonance frequency of the electric circuit formed by the electromagnetic induction loop with the output of the inverter itself.

[0040] Le correnti parassite indotte sulla superficie esterna del rullo di saldatura 14 generate dal campo magnetico variabile nel tempo, hanno una profondit? di penetrazione all?interno del rullo che ? funzione della frequenza di magnetizzazione del dispositivo di induzione 16. [0040] The eddy currents induced on the outer surface of the sealing roller 14 generated by the time-varying magnetic field have a depth of penetration inside the roller that ? function of the magnetization frequency of the induction device 16.

[0041] Infatti, come ? noto le correnti parassite indotte sono calcolate secondo la seguente formula: [0041] Indeed, how? known, the induced eddy currents are calculated according to the following formula:

Dove: Where:

? il modulo della densit? di corrente parassita indotta, funzione della profondit? di penetrazione ? the modulus of the density? of induced eddy current, function of the depth? of penetration

? il modulo della densit? di corrente per x = 0 ? the modulus of the density? of current for x = 0

? lo spessore di penetrazione ? the depth of penetration

Dove: Where:

? la frequenza delle correnti di magnetizzazione ? the frequency of the magnetizing currents

? la permeabilit? relativa del materiale ? the permeability? relating to the material

? la resistenza specifica del materiale ? the specific strength of the material

[0042] Vantaggiosamente, le superfici di saldatura 15 dei rulli di saldatura ? goffrata. La superfice di saldatura goffrata, che viene specificamente riscaldata per induzione, consente di ottenere una distribuzione del calore particolarmente efficiente su parti del rullo preposte alla sola saldatura ottenendo un risultato di saldatura ottimale. [0042] Advantageously, the sealing surfaces 15 of the sealing rolls ? embossed. The embossed sealing surface, which is specifically heated by induction, makes it possible to obtain particularly efficient heat distribution on parts of the roller intended for sealing only, obtaining an optimal sealing result.

[0043] La goffratura, indicata con 15A ? ottenuta ad esempio per la presenza di un insieme di protuberanze con opportuno disegno che si sviluppano sull?esterno del rullo di saldatura. Il disegno delle protuberanze di goffratura pu? essere il pi? vario (ad esempio troncoconico, tronco-piramidale, tratti rettilinei, forme particolari per loghi, ecc.). Nelle figure, a puro titolo di esempio, il disegno di goffratura ? dato da protuberanze tronco-piramidali, come mostrato nel particolare di figura 6. [0043] The embossing, indicated with 15A ? obtained for example by the presence of a set of protuberances with a suitable design which develop on the outside of the sealing roller. The design of the embossing bumps can be the most varied (for example truncated cone, truncated pyramid, straight sections, particular shapes for logos, etc.). In the figures, purely by way of example, the embossing design ? given by truncated pyramidal protuberances, as shown in the detail of figure 6.

[0044] Il disegno delle protuberanze in generale definisce zone di contatto (?punte?) di saldatura che hanno complessivamente un?area totale inferiore all?area della superficie cilindrica del rullo, formando in pratica un insieme di ?punte? di goffratura. La densit? delle punte di goffratura pu? essere compresa vantaggiosamente tra 0,5e 200 punte per cm^2, e pi? preferibilmente compresa tra 5 e 150 punte per cm^2, ed ancor pi? preferibilmente compresa tra 10 e 100 punte per cm^2. Tale goffratura consente di aumentare localmente la pressione di saldatura, a tutto vantaggio della qualit? della saldatura stessa. Opportunamente, l?altezza delle punte pu? essere compresa tra 0.1 mm e 2 mm, e pi? preferibilmente da 0.5 mm a 1.5 mm. [0044] The design of the protuberances generally defines welding contact areas (?tips?) which overall have a total area lower than the area of the cylindrical surface of the roller, in practice forming a set of ?tips? of embossing. The density? of the embossing tips pu? be advantageously between 0.5 and 200 points per cm^2, and more? preferably between 5 and 150 points per cm^2, and even more? preferably between 10 and 100 points per cm^2. This embossing allows the welding pressure to be locally increased, to the full advantage of the quality. of the weld itself. Conveniently, the height of the tips pu? be between 0.1 mm and 2 mm, and more? preferably from 0.5 mm to 1.5 mm.

[0045] Ad esempio, come visibile in figura 5, la struttura di ciascun rullo di saldatura 14 ? sostanzialmente cava e prevede due facce circolari 20, dotate centralmente di una connessione 21 per l?albero di rotazione del rullo (a sua volta connesso con un sistema di motorizzazione per la sua rotazione meglio descritto pi? avanti) attorno ad un asse Z. Un mantello cilindrico 22, con spessore ridotto, ? fissato stabilmente, ad esempio per saldatura o per accoppiamento ad interferenza od entrambi, sulla circonferenza delle due facce circolari 20 e definisce l?esterno cilindrico del rullo, preposto alla saldatura. La superficie esterna 15 del mantello cilindrico presenta la goffratura 15A. Per semplicit?, nei disegni, la goffratura ? mostrata solamente parzialmente, ma deve essere intesa come sviluppantesi completamente attorno all?asse di rotazione Z del rullo, e per una fascia di altezza tale da poter coprire le necessit? di area di saldatura delle confezioni (la goffratura poterebbe pertanto svilupparsi per tutta o solo per una parte, in direzione dell?asse di rotazione del rullo, della superficie cilindrica del rullo). [0045] For example, as visible in figure 5, the structure of each sealing roller 14? substantially hollow and has two circular faces 20, centrally equipped with a connection 21 for the rotation shaft of the roller (in turn connected to a motorization system for its rotation better described further on) around an axis Z. A cylindrical mantle 22, with reduced thickness, ? stably fixed, for example by welding or by interference fit or both, on the circumference of the two circular faces 20 and defines the cylindrical exterior of the roller, intended for welding. The outer surface 15 of the cylindrical shell has the embossing 15A. For simplicity?, in the drawings, the embossing is ? shown only partially, but must be understood as developing completely around the axis of rotation Z of the roller, and for a range of height such as to be able to cover the needs? of sealing area of the packages (the embossing could therefore develop for all or only for a part, in the direction of the axis of rotation of the roller, of the cylindrical surface of the roller).

[0046] Opportunamente, la superfice di saldatura goffrata dei rulli di saldatura ? dotata di un trattamento antiaderente, preferibilmente un trattamento al teflon. [0046] Conveniently, the embossed sealing surface of the sealing rolls is equipped with a non-stick treatment, preferably a Teflon treatment.

[0047] La frequenza operativa della corrente di induzione elettromagnetica ? compresa tra 10 Hz e 500kHz, e pi? preferibilmente tra 100 Hz e 100 KHz. Una tale frequenza operativa delle correnti di induzione elettromagnetica ? ad esempio atta a generare correnti parassite sul rullo di saldatura 14 tali da seguire prevalentemente il profilo della superficie esterna goffrata del rullo di saldatura, ovvero le correnti parassite seguono solo o prevalentemente le protuberanze di goffratura del rullo, con i vantaggi in termini di concentrazione del calore sulle punte, con conseguente miglioramento della saldatura e risparmio energetico. [0047] The operating frequency of the electromagnetic induction current ? between 10Hz and 500kHz, and more? preferably between 100Hz and 100KHz. Such an operating frequency of electromagnetic induction currents ? for example suitable for generating eddy currents on the sealing roller 14 such as to mainly follow the profile of the embossed outer surface of the sealing roller, i.e. the eddy currents only or mainly follow the embossing protuberances of the roller, with the advantages in terms of concentration of the heat on the tips, resulting in improved welding and energy savings.

[0048] Al fine di aumentare la flessibilit? produttiva della macchina di saldatura 10, questa comprende un apparato 40 di regolazione della distanza trasversale dei rulli di saldatura 14, che consente pertanto di adattare la macchina al formato delle confezioni. Ad esempio la macchina 10 prevede una base dotata di due contrapposte aree operative 41, a ciascuna delle quali ? associato un rullo di saldatura 14. Su ciascuna area operativa 41 ? prevista una prima guida 42, trasversale, ovvero preferibilmente ortogonale (secondo la direzione Y) alla direzione di avanzamento X, (ed anche preferibilmente orizzontale), sulla quale ? previsto un pattino 43, la cui posizione pu? essere regolata lungo tale prima guida 42. Da notare che la posizione del pattino 43 ? fissa durante il funzionamento della macchina 10, venendo sbloccato solamente quando ? necessario operare la regolazione della posizione del pattino. Ad esempio, tale bloccaggio ? realizzato mediante viti di bloccaggio 44 associate ad una staffa 45 fissa al pattino e poggiante su una rispettiva area operativa 41, in corrispondenza di un?asola di regolazione 46 parallela alla direzione di regolazione. [0048] In order to increase the flexibility? productivity of the sealing machine 10, this comprises an apparatus 40 for regulating the transversal distance of the sealing rollers 14, which therefore allows the machine to be adapted to the format of the packages. For example, the machine 10 has a base equipped with two opposing operating areas 41, each of which associated a welding roller 14. On each operating area 41 ? a first guide 42 is provided, transversal, or preferably orthogonal (according to the direction Y) to the direction of advancement X, (and also preferably horizontal), on which? expected a skate 43, whose position pu? be adjusted along this first guide 42. It should be noted that the position of the shoe 43 ? fixed during operation of the machine 10, being unlocked only when ? necessary to adjust the position of the pad. For example, this locking? achieved by means of locking screws 44 associated with a bracket 45 fixed to the skate and resting on a respective operating area 41, in correspondence with an adjustment slot 46 parallel to the adjustment direction.

[0049] Su di un rispettivo pattino 43 ? disposto un gruppo operativo 50 formato da un rullo di saldatura 14 e dal rispettivo dispositivo di induzione 16, nonch? dal sistema 30 di spinta trasversale dei rulli di saldatura 14 uno verso l?altro. [0049] On a respective pad 43 ? an operating unit 50 formed by a sealing roller 14 and the respective induction device 16 is arranged, as well as by the transversal thrust system 30 of the sealing rollers 14 towards each other.

[0050] Ad esempio, per quanto riguarda il sistema di spinta trasversale 30, sul pattino 43 ? prevista una seconda guida 51, parallela alla prima guida 42, che supporta scorrevolmente un carrello 52 (mobile nella direzione di tale seconda guida), a sua volta supportante un rispettivo rullo di saldatura 14. In pratica, il rullo 14 ? supportato dal carrello 52 consentendogli di ruotare attorno al proprio asse di rotazione Z. [0050] For example, as regards the transversal thrust system 30, on the shoe 43 ? a second guide 51 is provided, parallel to the first guide 42, which slidably supports a carriage 52 (movable in the direction of this second guide), in turn supporting a respective sealing roller 14. In practice, the roller 14 is provided. supported by the carriage 52 allowing it to rotate around its axis of rotation Z.

[0051] Un attuatore di movimentazione 53, come ad esempio un cilindro di traslazione di tipo pneumatico, oleodinamico o elettromeccanico, ? interposto con le sue estremit? operative tra il pattino 43 e il carrello 52, consentendo il movimento di quest?ultimo, portante il rullo di saldatura 14, lungo la seconda guida 51, ovvero verso il nastro trasportatore dove ? presente la confezione da saldare, ovvero spingendo il rullo verso la confezione. In questo modo ? possibile variare, aggiustare e regolare opportunamente la pressione di saldatura in modo che le punte di saldatura lavorino/saldino il film in modo ottimale, in cooperazione al profilo di temperatura realizzato dal dispositivo di induzione. Ad esempio se i rulli sono scaldati molto ma le confezioni/pacchi passano veloci (ovvero vi ? bassa pressione di spinta dei rulli). Le confezioni rimangono poco tempo a contatto coi rulli e quindi si potrebbe avere una saldatura insufficiente. La pressione di saldatura ? in pratica quella che termina il nip tra rulli di saldatura e la confezione/pacco cio? la superficie a contatto tra confezione e rullo. Con pressione maggiore viene deformata maggiormente la confezione (sta pi? a contatto con il rullo) e quindi acquisisce pi? calore (si scalda in maniera maggiore) ed inoltre le punte calde del rullo di saldatura premono di pi? sui vari strati di film dei lembi piegati della confezione, trasmettendo e facendo penetrare pi? calore tra i vari strati di film, ottenendo cos? una saldatura migliore. La regolazione della pressione di saldatura ? funzione della velocit? di avanzamento delle confezioni e/o della temperatura dei rulli. [0051] A movement actuator 53, such as for example a translation cylinder of the pneumatic, hydraulic or electromechanical type,? interposed with its ends? operative between the shoe 43 and the carriage 52, allowing the movement of the latter, carrying the sealing roller 14, along the second guide 51, or towards the conveyor belt where it is? present the package to be sealed, or by pushing the roller towards the package. In this way ? It is possible to vary, adjust and adjust the sealing pressure appropriately so that the sealing tips work/weld the film in an optimal way, in cooperation with the temperature profile created by the induction device. For example if the rollers are very hot but the packs/packs pass quickly (ie there is low thrust pressure on the rollers). The packages remain in contact with the rollers for a short time and therefore there could be an insufficient seal. The welding pressure? in practice, the one that ends the nip between the sealing rollers and the package/package cio? the surface in contact between the package and the roller. With greater pressure the package is more deformed (it is more in contact with the roller) and therefore acquires more? heat (it heats up more) and also do the hot tips of the welding roller press more? on the various layers of film of the folded edges of the package, transmitting and penetrating more? heat between the various layers of film, thus obtaining? a better weld. The adjustment of the welding pressure? speed function? progress of the packs and/or the temperature of the rollers.

[0052] Sul carrello 52 ? previsto anche il dispositivo di induzione 16, con la rispettiva spira di induzione 17 affacciata alla superfice di saldatura del rullo di saldatura 14. Opportunamente, la posizione trasversale lungo la direzione Y del dispositivo di induzione ? regolabile, al fine di regolare la distanza della spira di induzione dalla superficie di saldatura del rullo. Tale regolazione avviene ad esempio mediante asole di posizionamento 54 previste tra il dispositivo di induzione ed un suo supporto inferiore 55. Tale regolazione si opera ovviamente quando la macchina non ? in funzione. [0052] On trolley 52 ? the induction device 16 is also provided, with the respective induction coil 17 facing the sealing surface of the sealing roller 14. Conveniently, the transversal position along the Y direction of the induction device is adjustable, in order to adjust the distance of the induction loop from the welding surface of the roller. This adjustment takes place for example by means of positioning slots 54 provided between the induction device and its lower support 55. This adjustment obviously takes place when the machine is not? working.

[0053] Per quanto riguarda l?azionamento dei rulli di saldatura questo avviene mediante ad esempio un apparato 60, ben visibile in figura 4, di azionamento mediante un elemento flessibile chiuso ad anello, quale ad esempio una cinghia dentata 61, che prevede rispettive prime pulegge dentate 62 associate all?asse di rotazione Z dei due rulli 14, un motoriduttore 63 con una propria seconda puleggia dentata di azionamento 64, e pulegge dentate di rinvio, rispettivamente una terza puleggia 65, due coppia di quarte pulegge dentate 66 dispose a ridosso di rispettive prime pulegge dentate 62 per garantire il giusto avvolgimento della cinghia 61, ed una quinta puleggia di tensionamento 67. La cinghia dentata 61 percorre un circuito chiuso abbracciando parzialmente tali pulegge dentate. Quando si regola la posizione relativa dei rulli di saldatura 14 lungo la direzione Y, la tensione della cinghia dentata 61 cambia e questa ? regolabile agendo ad esempio sulla posizione della quinta puleggia di tensionamento 67. [0053] As far as the actuation of the welding rollers is concerned, this takes place for example by means of an apparatus 60, clearly visible in figure 4, which actuates by means of a flexible element closed in a ring, such as for example a toothed belt 61, which provides respective first toothed pulleys 62 associated with the rotation axis Z of the two rollers 14, a gearmotor 63 with its own second drive toothed pulley 64, and toothed transmission pulleys, respectively a third pulley 65, two pairs of fourth toothed pulleys 66 arranged close of respective first toothed pulleys 62 to guarantee the correct winding of the belt 61, and a fifth tensioning pulley 67. The toothed belt 61 runs through a closed circuit partially embracing these toothed pulleys. When adjusting the relative position of the sealing rollers 14 along the Y direction, the tension of the toothed belt 61 changes and this ? adjustable by acting, for example, on the position of the fifth tensioning pulley 67.

[0054] I due rulli di saldatura 14 pertanto ruotano in modo sincrono mediante un unico azionamento. [0054] The two sealing rollers 14 therefore rotate synchronously by means of a single drive.

[0055] In caso di fermo macchina, o altra necessit?, la macchina di saldatura 10 comprende un sistema di raffreddamento ad aria dei rulli di saldatura 14, che consiste ad esempio in una o pi? soffianti, ad esempio del tipo a lama d?aria, preferibilmente fredda, i cui ugelli 70 (indicati in modo schematico solo in figura 3) sono diretti verso i rulli. [0055] In the event of machine downtime, or other needs, the welding machine 10 comprises an air cooling system for the welding rollers 14, which consists for example of one or more? blowers, for example of the air knife type, preferably cold, the nozzles 70 of which (indicated schematically only in figure 3) are directed towards the rollers.

[0056] Le confezioni C vengono alimentate dalla stazione 13 mediante il nastro trasportatore 12, passano tra i rulli di saldatura 14 che premono lateralmente le confezioni e con la loro rotazione ne agevolano il movimento ad avanzare lungo X. I rulli 14 sono superficialmente riscaldati mediante induzione elettromagnetica (ad esempio vantaggiosamente prevalentemente in corrispondenza della zona goffrata 15A, ovvero in corrispondenza delle punte di saldatura). I rulli non fanno parte del circuito elettromagnetico di induzione ma vengono solamente investiti dal campo elettromagnetico, ottenendo superficialmente le correnti parassite necessarie al riscaldamento. [0056] The packages C are fed from the station 13 by means of the conveyor belt 12, they pass between the sealing rollers 14 which press the packages laterally and with their rotation they facilitate their movement to advance along X. The rollers 14 are heated on the surface by electromagnetic induction (for example advantageously mainly in correspondence with the embossed area 15A, or in correspondence with the welding tips). The rollers are not part of the electromagnetic induction circuit but are only hit by the electromagnetic field, superficially obtaining the eddy currents necessary for heating.

[0057] Una volta che le confezioni sono saldate, queste continuano il loro avanzamento sul nastro trasportatore fino ad una ulteriore zona di trattamento/presa/confezionamento, quale generalmente il cosiddetto confezionamento secondario. Ad esempio dopo la saldatura, le confezioni/pacchi C sono convogliate tramite nastri verso il confezionamento secondario che in generale consente di realizzare sacchi di confezioni/pacchi di rotoli (o altri prodotti cartacei). Tale confezionamento secondario prevede macchine che raggruppano le confezioni/pacchi in un predeterminato formato a uno o pi? strati, che poi sono insaccati ad esempio in un tubo di film che viene tagliato e saldato alle estremit?. [0057] Once the packages are sealed, they continue their advancement on the conveyor belt up to a further treatment/gripping/packaging area, which generally is the so-called secondary packaging. For example , after sealing, the packages/packs C are conveyed via belts towards the secondary packaging which generally allows making bags of packages/packs of rolls (or other paper products). This secondary packaging includes machines that group the packages/packs in a predetermined format with one or more? layers, which are then stuffed, for example, into a tube of film which is cut and sealed at the ends.

[0058] Preferibilmente, l?intervallo di temperatura ottimale delle superfici di saldatura dei rulli di saldatura ? compresa tra 100?C a 350?C, e pi? preferibilmente tra 150 e 300?C. [0058] Preferably, the optimum temperature range of the sealing surfaces of the sealing rollers is between 100?C to 350?C, and more? preferably between 150 and 300?C.

[0059] ? inteso che quanto illustrato rappresenta solo possibili forme di attua-zione non limitative dell?invenzione, la quale pu? variare nelle forme e disposizioni senza uscire dall?ambito del concetto alla base dell?invenzione. L?eventuale presenza di numeri di riferimento nelle rivendicazioni allegate ha unicamente lo scopo di faci-litarne la lettura alla luce della descrizione che precede e degli allegati disegni e non ne limita in alcun modo l?ambito di protezione. [0059] ? understood that what is illustrated represents only possible non-limiting embodiments of the invention, which can? vary in shapes and arrangements without leaving the scope of the concept at the basis of the invention. The possible presence of reference numbers in the attached claims has the sole purpose of facilitating their reading in the light of the foregoing description and the attached drawings and does not limit the scope of protection in any way.

Claims (13)

MACCHINA DI SALDATURA PER CONFEZIONI DI PRODOTTI AVVOLTI IN FILM TERMOSALDABILI RivendicazioniSEALING MACHINE FOR PRODUCT PACKAGES WRAPPED IN HEAT-SEALABLE FILM Claims 1. Macchina di saldatura per confezioni di prodotti avvolti in film termosaldabili, comprendente un apparato di alimentazione di confezioni di prodotti lungo una direzione di avanzamento, almeno una coppia di rulli di saldatura disposti da parti opposte di detta direzione di avanzamento, tra i quali vengono fatte avanzare le confezioni di prodotti per eseguire la saldatura dei film termosaldabili ed in cui detti rulli sono scaldati per induzione, caratterizzata dal fatto che la superfice di saldatura di almeno un detto rullo di saldatura ? goffrata.1. Sealing machine for packages of products wrapped in heat-sealable films, comprising an apparatus for feeding packages of products along one direction of advance, at least one pair of sealing rollers arranged on opposite sides of said direction of advance, between which made the packages of products advance to carry out the sealing of the heat-sealable films and in which said rollers are heated by induction, characterized in that the sealing surface of at least one said sealing roller ? embossed. 2. Macchina di saldatura secondo la rivendicazione 1, in cui detta superfice di saldatura goffrata ? dotata di un trattamento antiaderente, preferibilmente un trattamento al teflon.2. A welding machine according to claim 1, wherein said embossed welding surface is? equipped with a non-stick treatment, preferably a Teflon treatment. 3. Macchina secondo la rivendicazione 1 o 2, in cui il riscaldamento ad induzione avviene mediante almeno un dispositivo di induzione elettromagnetica esterno, ovvero affacciato, ad un rispettivo, od entrambi, i rulli di saldatura, collegato ad un generatore atto ad alimentare detto dispositivo di induzione elettromagnetica con correnti di induzione elettromagnetica atte a generare un flusso elettromagnetico diretto verso almeno un detto rullo di saldatura, per cui si generano correnti parassite su detto un rispettivo, od entrambi, i rulli di saldatura.3. Machine according to claim 1 or 2, wherein the induction heating takes place by means of at least one external electromagnetic induction device, i.e. facing, a respective, or both, the welding rollers, connected to a generator capable of powering said device of electromagnetic induction with electromagnetic induction currents suitable for generating an electromagnetic flux directed towards at least one said welding roller, whereby parasitic currents are generated on said respective one, or both, of the welding rollers. 4. Macchina secondo la rivendicazione 3, in cui la frequenza operativa di dette correnti di induzione elettromagnetica ? atta a generare correnti parassite su detto almeno un rullo di saldatura tali da seguire prevalentemente il profilo della superficie esterna goffrata di detto rullo di saldatura.4. Machine according to claim 3, wherein the operating frequency of said electromagnetic induction currents is adapted to generate eddy currents on said at least one sealing roller such as to mainly follow the profile of the embossed outer surface of said sealing roller. 5. Macchina secondo la rivendicazione 3 o 4, in cui dette correnti parassite seguono solo o prevalentemente le protuberanze di goffratura di detto almeno un rullo di saldatura. 5. Machine according to claim 3 or 4, wherein said eddy currents follow only or mainly the embossing protuberances of said at least one sealing roller. 6. Macchina secondo una o pi? delle rivendicazioni precedenti, in cui la frequenza operativa della corrente di induzione elettromagnetica ? compresa tra 10 Hz e 500kHz, preferibilmente tra 100 Hz e 100 KHz.6. Machine according to one or more? of the preceding claims, wherein the operating frequency of the electromagnetic induction current is between 10Hz and 500kHz, preferably between 100Hz and 100KHz. 7. Macchina secondo una o pi? delle rivendicazioni precedenti, in cui detto apparato di alimentazione di confezioni comprende un nastro trasportatore inferiore e detti rulli di saldatura presentano assi di rotazione ortogonali a detto nastro trasportatore inferiore, preferibilmente orientati verticalmente.7. Machine according to one or more? of the preceding claims, wherein said package feeding apparatus comprises a lower conveyor belt and said sealing rollers have rotation axes perpendicular to said lower conveyor belt, preferably oriented vertically. 8. Macchina secondo una o pi? delle rivendicazioni precedenti, comprendente un sistema di raffreddamento ad aria dei rulli di saldatura.8. Machine according to one or more? of the preceding claims, comprising an air cooling system for the sealing rollers. 9. Macchina secondo una o pi? delle rivendicazioni precedenti, comprendente un apparato di regolazione della distanza trasversale di detti rulli di saldatura.9. Machine according to one or more? of the preceding claims, comprising an apparatus for regulating the transversal distance of said sealing rollers. 10. Macchina secondo una o pi? delle rivendicazioni precedenti, comprendente un sistema di spinta trasversale di detti rulli uno verso l?altro al fine di realizzare la corretta pressione di saldatura sulle confezioni.10. Machine according to one or more? of the preceding claims, comprising a system for transverse thrusting of said rollers towards each other in order to achieve the correct sealing pressure on the packages. 11. Macchina secondo una o pi? delle rivendicazioni precedenti, in cui ? presente un ?unica coppia di detti rulli di saldatura, ed in cui, preferibilmente il diametro di ciascun detto rullo ? compreso tra 100 mm e 600 mm, pi? preferibilmente tra 150 mm e 500 mm, e ancora pi? preferibilmente tra 200 mm e 400 mm.11. Machine according to one or more? of the previous claims, in which ? present a single pair of said welding rollers, and in which, preferably, the diameter of each said roller ? between 100 mm and 600 mm, plus? preferably between 150 mm and 500 mm, and even more? preferably between 200 mm and 400 mm. 12. Macchina secondo una o pi? delle rivendicazioni precedenti, in cui la superfice di saldatura goffrata di detto almeno un rullo di saldatura presenta punte di goffratura con densit? compresa tra 0,510 e 200 punti punte per cm^2, e pi? preferibilmente compre-sa tra 5 e 150 punte per cm^2, ed ancor pi? preferibilmente compresa tra 10 e 100 punte per cm^2.12. Machine according to one or more? of the preceding claims, wherein the embossed sealing surface of said at least one sealing roller has embossing tips with a density of between 0.510 and 200 point points per cm^2, and more? preferably between 5 and 150 points per cm^2, and even more? preferably between 10 and 100 points per cm^2. 13. Macchina secondo una o pi? delle rivendicazioni precedenti, in cui l?intervallo di temperatura ottimale delle superfici di saldatura dei rulli di saldatura ? compresa tra 100?C a 350?C, e pi? preferibilmente tra 150 e 300?C. 13. Machine according to one or more? of the preceding claims, wherein the optimum temperature range of the sealing surfaces of the sealing rolls is? between 100?C to 350?C, and more? preferably between 150 and 300?C.
IT102021000022691A 2021-09-01 2021-09-01 WELDING MACHINE FOR PRODUCT PACKAGES WRAPPED IN HEAT-SEALABLE FILM IT202100022691A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058361A (en) * 1990-03-14 1991-10-22 Schmacher Roland W Package end fold sealer and method
DE4202883A1 (en) * 1992-02-01 1993-08-05 Focke & Co Sealing flaps of packet esp. cigarette packet with sealable wrapping - using electrically heated endless sealing organ esp. belt which delivers packets along conveyor track exerting pressure on sides having flaps sealed in transport
EP1228966A1 (en) 2001-02-02 2002-08-07 Casmatic S.p.A. Packing machine
US20040151481A1 (en) * 2001-04-23 2004-08-05 Stefano Cassoli Apparatus for the heat sealing of thermoplastic packagings or wrappings
EP2213577A2 (en) * 2009-01-29 2010-08-04 KPL Packaging S.p.A. Heat-sealing device and method for packaging machines, and packaging machine comprising said device
EP2766266A1 (en) 2011-10-10 2014-08-20 Fabio Perini Packaging S.p.A. Packaging machine for packing rolls of paper and the like
WO2018058789A1 (en) 2016-09-30 2018-04-05 福建工程学院 Method, system, and terminal for detecting fall in moving state

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058361A (en) * 1990-03-14 1991-10-22 Schmacher Roland W Package end fold sealer and method
DE4202883A1 (en) * 1992-02-01 1993-08-05 Focke & Co Sealing flaps of packet esp. cigarette packet with sealable wrapping - using electrically heated endless sealing organ esp. belt which delivers packets along conveyor track exerting pressure on sides having flaps sealed in transport
EP1228966A1 (en) 2001-02-02 2002-08-07 Casmatic S.p.A. Packing machine
US20040151481A1 (en) * 2001-04-23 2004-08-05 Stefano Cassoli Apparatus for the heat sealing of thermoplastic packagings or wrappings
EP2213577A2 (en) * 2009-01-29 2010-08-04 KPL Packaging S.p.A. Heat-sealing device and method for packaging machines, and packaging machine comprising said device
EP2766266A1 (en) 2011-10-10 2014-08-20 Fabio Perini Packaging S.p.A. Packaging machine for packing rolls of paper and the like
WO2018058789A1 (en) 2016-09-30 2018-04-05 福建工程学院 Method, system, and terminal for detecting fall in moving state

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