WO2002085711A1 - Apparatus for heat-sealing plastic packagings or wrapping, for example packagings with sets of rolls of paper - Google Patents

Apparatus for heat-sealing plastic packagings or wrapping, for example packagings with sets of rolls of paper Download PDF

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Publication number
WO2002085711A1
WO2002085711A1 PCT/EP2002/004347 EP0204347W WO02085711A1 WO 2002085711 A1 WO2002085711 A1 WO 2002085711A1 EP 0204347 W EP0204347 W EP 0204347W WO 02085711 A1 WO02085711 A1 WO 02085711A1
Authority
WO
WIPO (PCT)
Prior art keywords
packagings
conveyors
strips
heat
sealed
Prior art date
Application number
PCT/EP2002/004347
Other languages
French (fr)
Inventor
Stefano Cassoli
Giordano Gorrieri
Original Assignee
Casmatic 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 Casmatic S.P.A. filed Critical Casmatic S.P.A.
Publication of WO2002085711A1 publication Critical patent/WO2002085711A1/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
    • 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
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or resistive strip
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/229—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for tensioning said heated wire, resistive ribbon, resistive band or resistive strip
    • 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
    • B29C65/7873—In-line machines, i.e. feeding, joining and discharging are in one production line using conveyor belts or conveyor chains using cooperating conveyor belts or cooperating 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • 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
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • 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
    • B29C66/8182—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 thermal insulating constructional aspects
    • B29C66/81821—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 thermal insulating constructional aspects of the welding jaws
    • 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
    • B29C66/8187—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 electrical insulating constructional aspects
    • B29C66/81871—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 electrical insulating constructional aspects of the welding jaws
    • 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
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • B29C66/83423—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types cooperating bands or belts
    • 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
    • B65B51/22—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
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/225—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a coating or being printed, e.g. being applied as a paint or forming a printed circuit
    • 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
    • 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

Definitions

  • TITLE "Apparatus for heat-sealing plastic packagings or wrappings, for example packagings with sets of rolls of paper"
  • the invention finds industrial application to machines that use heat-sealable plastic film, such as polyethylene or polypropylene, for packaging in or polypropylene, to package sets of rolls of paper, for example toilet rolls, kitchen towels or other paper-based products, and for these machines proposes a novel apparatus for the continuous-cycle heat-sealing of the folded-down flaps of the said packagings.
  • heat-sealable plastic film such as polyethylene or polypropylene
  • polypropylene for packaging in or polypropylene
  • package sets of rolls of paper for example toilet rolls, kitchen towels or other paper-based products
  • Figure 1 is a plan view of the typical layout of a continuous sealing unit used in packaging machines of known type.
  • the letter P indicates the packaging with the flaps to be sealed folded down on either side and held in the correct position by lateral guides G, G'.
  • the packaging P is inserted with its side flaps between two parallel conveyor belts T1 , TV deflected at each end around the vertical axes A, A and driven in such a way that their inside runs travel in the same direction as the arrow F and at the same speed as the conveyor T.
  • means are provided to adjust the distance between the conveyors T1 , TV.
  • the latter are made from materials suitably resistant to mechanical wear and sufficiently permeable to heat, and at least the surface that contacts the packaging is made from or coated with Teflon or equivalent materials.
  • Teflon or equivalent materials The inside faces of the active runs of the said conveyors T1 , TV travel first over heating plates RC, RC and then over cooling plates RF, RF'.
  • the first plates have longitudinal projections on which the inside runs of the conveyors T1 , TV travel, are made of metal and are equipped with usually vertical armoured resistors, appropriately distributed and controlled by thermostatic probes, so that the said projections are maintained at temperatures such as to soften or "plasticize", through the inside runs of the conveyors T1 , TV, the folded-down flaps of the packaging P, to prepare them for sealing.
  • the sealed areas of the flaps are cooled and stabilized in the mutually attached condition before leaving the apparatus in question.
  • the apparatus as shown in Figure 1 requires drawing large amounts of electrical power, which cannot be reduced when handling packages that are not so high.
  • the peripheral parts of packagings are subject to heating by the sources RC, RC but, having no internal packaging material to absorb any of the heat, and being formed by only a single layer of plastic material rather than several layers folded on top of each other like the portions of the flaps that are being sealed together, tend to overheat and tear, which creates problems.
  • the known type of apparatus has a very high thermal inertia which causes problems when starting and stopping the said machine, especially in the event of accidental stoppages, when a packaging may be left inside the conveyors T1 and TV and may literally burn.
  • the invention seeks to overcome these very serious drawbacks of the prior art, with the following proposed solution.
  • strip resistors electrical strip resistors
  • the strips are connected to the ends of an electrical circuit by which they can be heated by the Joule effect and can be temperature-controlled by electronically monitoring how their resistance changes as the heating temperature changes.
  • the invention proposes replacing the aforesaid radiant heating bodies RC, RC with bodies of any mechanically strong material, whether made in one piece or composite, equipped with a plurality of sealing strips of the aforesaid type laid parallel with each other in the direction of the length of the conveyors T1 and TV and operating in contact with the inside runs of these conveyors.
  • the strips are quantitatively involved in the sealing process in direct proportion to the dimensions of the packaging to be sealed, in such a way as to affect parts of this packaging in which packaged material is present and not peripheral parts of these packagings as occurs in the prior art.
  • Such a system has practically zero thermal inertia and therefore quickly reaches operating temperature and equally quickly becomes inactive, thereby avoiding the problems of known systems of Figure 1 , compared with which it also has the advantage of using much less electrical power.
  • FIG. 2 is a perspective view of the present improved apparatus
  • Fig. 3 is a schematic perspective view of a type of strip resistor useable in the present apparatus
  • Fig. 4 shows the apparatus of Figure 2 in cross section on plane IV-IV;
  • - Fig. 5 is a schematic plan view of one of the bodies with the sealing strips of the apparatus seen in Figure 2;
  • FIGs. 6 and 7 show two possible embodiments of details relating to the application of the sealing strips in the present apparatus and viewed in the section marked VI-VI in Figure 5.
  • the apparatus illustrated in Figure 2 differs from that illustrated in Figure 1 essentially in the design of the heat sources RCn, RCn', which now take the form of electrical strip resistors 1 which are heated by the Joule effect, for example of the type illustrated in Figure 3.
  • These are normally housed in thin narrow composite envelopes or jackets 101 of usually Teflon-based nonstick material, at least as regards the parts designed to be in contact with the surfaces to which the heat must be transmitted (see below). Appropriate lengths of the strip project from the ends of the jacket 101 for connection to the electrical supply and control circuit (see below).
  • the body 2 of the heat sources RCn, RCn' may be metallic or non-metallic and may be made in one piece or may be made up of a plurality of straight horizontal bodies placed one on top of the other and the said body 2 may be fixed or may be elastically preloaded by a predetermined amount by any suitable means towards the inside run of its particular conveyor T1 , TV, as indicated schematically in Figure 4 by the springs 3.
  • the body 2 of these sources is given a plurality of straight longitudinal grooves 4 (Fig. 6), parallel with the conveyor T, in which inserts 5 are fixed of material with a good degree of thermal and electrical insulation, and over each of these inserts is then positioned, lengthwise and optionally with adhesive bonding, the flat rear part of the jacket 101 of a strip 1 , so that the projecting part of this assembly 1 , 101 projects the required amount from that face of the body 2 which is nearest the conveyor T1 or TV, in order that the latter is effectively in contact with all of the sealing strips.
  • the grooves 4 with their inserts 5 are preferably extended to also effect the portions next to the ends of the said body 2, so that the bare end parts of the strips 1 connected to terminals 6 and 6' of both electrically and thermally insulating material (remote from the active surface of the said strip and therefore not interfering with the conveyor T1 or T1 ') can press on these adjacent portions.
  • the terminal 6 is fixed to the body 2, while the terminal 6' may be guided longitudinally along the same body 2 by means that are not illustrated, and is connected to a resilient means 7, attached at the other end to the body 2, thus applying a suitable longitudinal tension to the strip 1 to keep it always . correctly tensioned despite the changes in its length due to the heating and cooling caused by the. on and off application of the electrical power supply.
  • References 8 and 8' indicate the ends of the electrical circuit connected to the terminals 6, 6', whose general and contact resistance must be such as to have values that do not compromise the electronic temperature control applied to the strips 1 of the present system, which monitors changes in resistance as the said heating temperature changes and which consequently modifies the values of the current as the resistance varies, so as to keep the latter between predetermined parameters and thus keep the temperature of the strips 1 within the predetermined values.
  • Figure 7 illustrates a variant of the system whereby the strip 1 is without at least part of the jacket 101 designed for contact with the conveyor T1 or T1 ', so that the transfer of heat to this component is more efficient, and the temperature to which each strip 1 is heated can be further reduced.
  • the strips 1 will all be connected to a power and control unit 9 shown diagrammatically in Figure 2.
  • This unit can easily be designed by those skilled in the art. It is preferably also designed to have selective functions so as to be able to vary the number of strips 1 to which power is supplied in direct proportion to the dimensions of the packagings P or P' to be sealed and so as to avoid heating strips that will not come adjacent to the actual sides of the packagings.
  • Manually operated or servo controlled means may be provided to make the conveyor T and/or the set of conveyors T1 , TV with their associated assemblies RCn-RF and RCn'-RF' adjustable for height, so that as the height of the packagings varies, the packagings can be positioned with their tops and bottoms always approximately equidistant from the longitudinal sides of the active runs of the conveyors T1 , TV, as illustrated diagrammatically in Figure 4 for the two different packagings P and P'.
  • the conveyor T may be constructed with a fixed height and suitable means may cyclically shift, with continuous variations or steps, distributed slowly over time, the height of the conveyors T1 , TV with their associated parts, first up and then down, in such a way that the packagings to be sealed progressively contact the conveyors T1 and TV across their full transverse dimensions, so as to distribute the wear evenly across their entire surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Package Closures (AREA)

Abstract

The heat sources which act in conjunction with the active runs of the vertical-axis conveyors (T1, T1') which keep the side flaps of the packagings folded down, comprise bodies (2) of any mechanically strong material, whether made in one piece or composite equipped with a plurality of electrical strip resistors (1) laid parallel with each other in the direction of the length of the said conveyors and operating in contact with the active runs of these conveyers. The strips, heated by the Joule effect and temperature-controlled by continuous electronic monitoring of their resistances, are quantitatively involved in the sealing process in direct proportion to the dimensions of the packagings to be sealed. This system has practically zero thermal inertia and therefore quickly reaches operating temperatures and equally quickly becomes inactive, thereby avoiding the dangerous problems of known radiant-mass systems, compared with which it also has the advantage of using much less electrical power.

Description

TITLE: "Apparatus for heat-sealing plastic packagings or wrappings, for example packagings with sets of rolls of paper"
DESCRIPTION
The invention finds industrial application to machines that use heat-sealable plastic film, such as polyethylene or polypropylene, for packaging in or polypropylene, to package sets of rolls of paper, for example toilet rolls, kitchen towels or other paper-based products, and for these machines proposes a novel apparatus for the continuous-cycle heat-sealing of the folded-down flaps of the said packagings. However, it will be understood that the apparatus in question must be understood as being protected for any other use than that indicated above, and for which it may be suitable.
In order to clarify the objects of the invention, the reader's attention is called to the diagram of Figure 1 , which is a plan view of the typical layout of a continuous sealing unit used in packaging machines of known type. In this figure, the letter P indicates the packaging with the flaps to be sealed folded down on either side and held in the correct position by lateral guides G, G'. Pushed from the rear by means schematically marked S, and standing on an optional lower conveyor T travelling at the appropriate speed in the direction indicated by the arrow F, the packaging P is inserted with its side flaps between two parallel conveyor belts T1 , TV deflected at each end around the vertical axes A, A and driven in such a way that their inside runs travel in the same direction as the arrow F and at the same speed as the conveyor T. If the dimensions of the packagings change, means are provided to adjust the distance between the conveyors T1 , TV. The latter are made from materials suitably resistant to mechanical wear and sufficiently permeable to heat, and at least the surface that contacts the packaging is made from or coated with Teflon or equivalent materials. The inside faces of the active runs of the said conveyors T1 , TV travel first over heating plates RC, RC and then over cooling plates RF, RF'. The first plates have longitudinal projections on which the inside runs of the conveyors T1 , TV travel, are made of metal and are equipped with usually vertical armoured resistors, appropriately distributed and controlled by thermostatic probes, so that the said projections are maintained at temperatures such as to soften or "plasticize", through the inside runs of the conveyors T1 , TV, the folded-down flaps of the packaging P, to prepare them for sealing. In the subsequent passage on the plates RF, RF', the sealed areas of the flaps are cooled and stabilized in the mutually attached condition before leaving the apparatus in question.
The apparatus as shown in Figure 1 requires drawing large amounts of electrical power, which cannot be reduced when handling packages that are not so high. At this point it should be noted that the peripheral parts of packagings are subject to heating by the sources RC, RC but, having no internal packaging material to absorb any of the heat, and being formed by only a single layer of plastic material rather than several layers folded on top of each other like the portions of the flaps that are being sealed together, tend to overheat and tear, which creates problems.
Additionally, the known type of apparatus has a very high thermal inertia which causes problems when starting and stopping the said machine, especially in the event of accidental stoppages, when a packaging may be left inside the conveyors T1 and TV and may literally burn.
The invention seeks to overcome these very serious drawbacks of the prior art, with the following proposed solution.
In the technique of heat-sealing plastics, it is known practice for heat sealing by sealing bars to make use of electrical strip resistors, hereinafter termed "strips" for short, which are usually packaged in small envelopes of nonstick material and characterized by an extremely limited thermal inertia. The strips are connected to the ends of an electrical circuit by which they can be heated by the Joule effect and can be temperature-controlled by electronically monitoring how their resistance changes as the heating temperature changes. The invention proposes replacing the aforesaid radiant heating bodies RC, RC with bodies of any mechanically strong material, whether made in one piece or composite, equipped with a plurality of sealing strips of the aforesaid type laid parallel with each other in the direction of the length of the conveyors T1 and TV and operating in contact with the inside runs of these conveyors. The strips are quantitatively involved in the sealing process in direct proportion to the dimensions of the packaging to be sealed, in such a way as to affect parts of this packaging in which packaged material is present and not peripheral parts of these packagings as occurs in the prior art. Such a system has practically zero thermal inertia and therefore quickly reaches operating temperature and equally quickly becomes inactive, thereby avoiding the problems of known systems of Figure 1 , compared with which it also has the advantage of using much less electrical power.
Other features of the invention, and the advantages procured thereby, will become clearer in the course of the following description, which refers to the figures of the attached drawing sheets, in which in addition to Figure 1 (already considered): Fig. 2 is a perspective view of the present improved apparatus; Fig. 3 is a schematic perspective view of a type of strip resistor useable in the present apparatus;
Fig. 4 shows the apparatus of Figure 2 in cross section on plane IV-IV; - Fig. 5 is a schematic plan view of one of the bodies with the sealing strips of the apparatus seen in Figure 2; and
Figs. 6 and 7 show two possible embodiments of details relating to the application of the sealing strips in the present apparatus and viewed in the section marked VI-VI in Figure 5. The apparatus illustrated in Figure 2 differs from that illustrated in Figure 1 essentially in the design of the heat sources RCn, RCn', which now take the form of electrical strip resistors 1 which are heated by the Joule effect, for example of the type illustrated in Figure 3. These are normally housed in thin narrow composite envelopes or jackets 101 of usually Teflon-based nonstick material, at least as regards the parts designed to be in contact with the surfaces to which the heat must be transmitted (see below). Appropriate lengths of the strip project from the ends of the jacket 101 for connection to the electrical supply and control circuit (see below).
The body 2 of the heat sources RCn, RCn' may be metallic or non-metallic and may be made in one piece or may be made up of a plurality of straight horizontal bodies placed one on top of the other and the said body 2 may be fixed or may be elastically preloaded by a predetermined amount by any suitable means towards the inside run of its particular conveyor T1 , TV, as indicated schematically in Figure 4 by the springs 3.
On the face designed to contact the conveyor T1 or TV, the body 2 of these sources is given a plurality of straight longitudinal grooves 4 (Fig. 6), parallel with the conveyor T, in which inserts 5 are fixed of material with a good degree of thermal and electrical insulation, and over each of these inserts is then positioned, lengthwise and optionally with adhesive bonding, the flat rear part of the jacket 101 of a strip 1 , so that the projecting part of this assembly 1 , 101 projects the required amount from that face of the body 2 which is nearest the conveyor T1 or TV, in order that the latter is effectively in contact with all of the sealing strips. It should be noted on this subject that the coefficient friction of the jackets 101 is definitely much less than that of the longitudinal metal projections of the known type of radiator RC, RC shown in Figure 1 , so the conveyors T1 , TV of the present apparatus are subject to definitely less wear and will therefore last longer.
As can be seen in Figure 5, the grooves 4 with their inserts 5 are preferably extended to also effect the portions next to the ends of the said body 2, so that the bare end parts of the strips 1 connected to terminals 6 and 6' of both electrically and thermally insulating material (remote from the active surface of the said strip and therefore not interfering with the conveyor T1 or T1 ') can press on these adjacent portions. The terminal 6 is fixed to the body 2, while the terminal 6' may be guided longitudinally along the same body 2 by means that are not illustrated, and is connected to a resilient means 7, attached at the other end to the body 2, thus applying a suitable longitudinal tension to the strip 1 to keep it always . correctly tensioned despite the changes in its length due to the heating and cooling caused by the. on and off application of the electrical power supply.
References 8 and 8' indicate the ends of the electrical circuit connected to the terminals 6, 6', whose general and contact resistance must be such as to have values that do not compromise the electronic temperature control applied to the strips 1 of the present system, which monitors changes in resistance as the said heating temperature changes and which consequently modifies the values of the current as the resistance varies, so as to keep the latter between predetermined parameters and thus keep the temperature of the strips 1 within the predetermined values.
Figure 7 illustrates a variant of the system whereby the strip 1 is without at least part of the jacket 101 designed for contact with the conveyor T1 or T1 ', so that the transfer of heat to this component is more efficient, and the temperature to which each strip 1 is heated can be further reduced.
The strips 1 will all be connected to a power and control unit 9 shown diagrammatically in Figure 2. This unit can easily be designed by those skilled in the art. It is preferably also designed to have selective functions so as to be able to vary the number of strips 1 to which power is supplied in direct proportion to the dimensions of the packagings P or P' to be sealed and so as to avoid heating strips that will not come adjacent to the actual sides of the packagings.
Manually operated or servo controlled means (not shown) may be provided to make the conveyor T and/or the set of conveyors T1 , TV with their associated assemblies RCn-RF and RCn'-RF' adjustable for height, so that as the height of the packagings varies, the packagings can be positioned with their tops and bottoms always approximately equidistant from the longitudinal sides of the active runs of the conveyors T1 , TV, as illustrated diagrammatically in Figure 4 for the two different packagings P and P'. As an alternative, the conveyor T may be constructed with a fixed height and suitable means may cyclically shift, with continuous variations or steps, distributed slowly over time, the height of the conveyors T1 , TV with their associated parts, first up and then down, in such a way that the packagings to be sealed progressively contact the conveyors T1 and TV across their full transverse dimensions, so as to distribute the wear evenly across their entire surface.

Claims

1. Apparatus for heat-sealing plastic packagings or wrappings, such as packagings with sets of rolls of paper or other paper-based products, of the type in which the said packagings (P) are inserted with the flaps to be sealed between two parallel conveyors (T1 , TV) running around vertical axes (A, A'), the distance between which is adjustable to suit the dimensions of the packagings to be sealed, and which are constructed with belts of materials that are not deformed by temperature but are sufficiently permeable to the said temperature and are nonstick, and which are such that that face of the active run which is not in contact with the flaps to be sealed slides first over the heat sources (RC, RC) that produce the necessary temperature to plasticize and seal the said flaps of the packaging and then slides over sources of refrigeration (RF, RF') which remove heat from the sealed flaps to stabilize the seals, the said apparatus being characterized in that it comprises new heat sources (RCn, RCn') that use a plurality of parallel electrical strip resistors (1), suitably spaced out and oriented parallel with the longitudinal axis of the said vertical-axis conveyors (T1 , TV), which strips heat up by the Joule effect and are characterized by having a low thermal inertia.
2. Apparatus according to Claim 1 , in which the sealing strips (1) project an appropriate amount from the supporting bodies (2) on which they are mounted.
3. Apparatus according to Claim 2, in which the bodies (2) supporting the sealing strips (1 ) are made in one piece or are composite and are made of metallic material or a material with a good degree of electrical and thermal insulation.
4. Apparatus according to Claim 3, in which the bodies supporting the sealing strips (1 ) can be pushed by suitable resilient means (4) against the active run of the corresponding conveyor (T1 , T1 ').
5. Apparatus according to Claim 3, in which the sealing strips (1) press directly or indirectly on inserts (5) of thermal and electrical insulation housed in longitudinal grooves (4) recessed into the body (2) of the heat sources.
6. Apparatus according to Claim 5, in which the sealing strips (1) are each inside their own jacket (101 ) of nonstick material and operate in contact with the said vertical-axis conveyors (T1 , TV) through this intermediate jacket.
7. Apparatus according to Claim 5, in which the sealing strips (1) operate in direct contact with the said vertical-axis conveyors (T1 , TV).
8. Apparatus according to Claim 1 , in which the sealing strips (1) are connected at at least one end to a moveable terminal (6') of electrically and thermally insulating material mounted on a tension spring (7) that maintains the tension on the said strips when their length changes as a result of the heating and cooling to which they are subjected during the operation of the said apparatus.
9. Apparatus according to Claim 1 , in which the sealing strips (1) are connected to a unit (9) that supplies electrical power to the said strips and controls the temperature by controlling how much electrical current is drawn, this unit also being designed to allow selective supply of the said strips as the dimensions of the packagings to be sealed vary, to avoid heating those strips which are outside of and on the perimeter of the lateral volume of the said packagings.
10. Apparatus according to Claim 1 , characterized in that it comprises manually operated or servo controlled means which, as the dimensions of the packagings to be sealed vary, vary the relative height of the lower conveyor (T) on which the said packagings are travelling and of the vertical-axis conveyors (T1 , T1 ') together with their sources of heat and refrigeration, in such a way that the said packagings and the strips (1 ) activated for the latter are always central with respect to the active run of the said conveyors (T1 , TV) to avoid a tendency for the latter to work off their end rollers (A, A').
11. Apparatus according to Claim 1 , characterized in that it comprises servo controlled means for varying, with small continuous or stepped variations distributed slowly over time, the height, relative to the lower conveyor (T) on which the packagings travel, of the vertical-axis conveyors (T1 , TV) and their associated sources of heat and refrigeration , in such a way that the packagings contact the said conveyors (T1 , TV) progressively over their full transverse dimension in order uniformly to distribute the wear caused to the conveyors by sliding over the heat sources (RCn, RCn') and over the sources of refrigeration (RF, RF').
PCT/EP2002/004347 2001-04-23 2002-04-19 Apparatus for heat-sealing plastic packagings or wrapping, for example packagings with sets of rolls of paper WO2002085711A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001BO000239A ITBO20010239A1 (en) 2001-04-23 2001-04-23 APPARATUS FOR HEAT-SEALING OF PACKAGES OR PACKAGING OF PLASTIC MATERIAL, FOR EXAMPLE OF PACKAGES WITH GROUPS OF PAPER ROLLS OR AL
ITBO2001A000239 2001-04-23

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005080206A1 (en) * 2004-02-19 2005-09-01 Kpl Packaging S.P.A. Apparatus for packaging rolls of paper or other products
WO2008153984A1 (en) * 2007-06-08 2008-12-18 International Paper Company Easy-opening ream wrap and heating element
EP2088084A2 (en) * 2008-02-06 2009-08-12 G.D. S.p.A A machine for packaging products in wrappers of sheet material
EP2383188A1 (en) * 2010-04-30 2011-11-02 Uhlmann Pac-Systeme GmbH & Co. KG Method and device for filling and sealing folding boxes
CN103231846A (en) * 2013-05-10 2013-08-07 上海紫泉标签有限公司 Sealing bag and manufacturing method and device thereof
US8568842B2 (en) 2010-12-28 2013-10-29 International Paper Company Film for wrapping, methods of making and using
EP3204211B1 (en) 2014-10-10 2020-07-08 Cryovac, LLC Apparatus and process for packaging a product

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US4641482A (en) * 1982-10-06 1987-02-10 Athena Controls Inc Heat station for a heat sealing system
EP0351553A1 (en) * 1988-07-20 1990-01-24 SASIB S.p.A. Device for sealing the overlapped end flaps of a thermoplastic material wrapper for packages, particularly for packages of cigarettes
GB2243802A (en) * 1990-04-07 1991-11-13 Ceetak Developments Limited Heat sealing apparatus
WO1993024302A1 (en) * 1992-05-27 1993-12-09 Ceetak Developments Limited Heating control means
EP0634328A1 (en) * 1993-05-19 1995-01-18 Tetra Laval Holdings & Finance SA An apparatus for heat-sealing thermoplastic materials
EP0884242A1 (en) * 1997-06-10 1998-12-16 G.D. S.p.A. A method and a device for securing sealportions of heat-sealable product wrappings
EP0941933A1 (en) * 1998-03-07 1999-09-15 Ceetak Limited Apparatus for cutting or sealing plastics material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641482A (en) * 1982-10-06 1987-02-10 Athena Controls Inc Heat station for a heat sealing system
EP0351553A1 (en) * 1988-07-20 1990-01-24 SASIB S.p.A. Device for sealing the overlapped end flaps of a thermoplastic material wrapper for packages, particularly for packages of cigarettes
GB2243802A (en) * 1990-04-07 1991-11-13 Ceetak Developments Limited Heat sealing apparatus
WO1993024302A1 (en) * 1992-05-27 1993-12-09 Ceetak Developments Limited Heating control means
EP0634328A1 (en) * 1993-05-19 1995-01-18 Tetra Laval Holdings & Finance SA An apparatus for heat-sealing thermoplastic materials
EP0884242A1 (en) * 1997-06-10 1998-12-16 G.D. S.p.A. A method and a device for securing sealportions of heat-sealable product wrappings
EP0941933A1 (en) * 1998-03-07 1999-09-15 Ceetak Limited Apparatus for cutting or sealing plastics material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005080206A1 (en) * 2004-02-19 2005-09-01 Kpl Packaging S.P.A. Apparatus for packaging rolls of paper or other products
WO2008153984A1 (en) * 2007-06-08 2008-12-18 International Paper Company Easy-opening ream wrap and heating element
EP2353845A1 (en) * 2007-06-08 2011-08-10 International Paper Company Heating element and machine therewith
EP2813346A1 (en) * 2007-06-08 2014-12-17 International Paper Company Heating element
US9346216B2 (en) 2007-06-08 2016-05-24 International Paper Company Easy-opening ream wrap
EP2088084A2 (en) * 2008-02-06 2009-08-12 G.D. S.p.A A machine for packaging products in wrappers of sheet material
EP2088084A3 (en) * 2008-02-06 2009-09-09 G.D. S.p.A A machine for packaging products in wrappers of sheet material
US8096096B2 (en) 2008-02-06 2012-01-17 G.D. S.P.A. Machine for packaging products in wrappers of sheet material
EP2383188A1 (en) * 2010-04-30 2011-11-02 Uhlmann Pac-Systeme GmbH & Co. KG Method and device for filling and sealing folding boxes
US8568842B2 (en) 2010-12-28 2013-10-29 International Paper Company Film for wrapping, methods of making and using
CN103231846A (en) * 2013-05-10 2013-08-07 上海紫泉标签有限公司 Sealing bag and manufacturing method and device thereof
EP3204211B1 (en) 2014-10-10 2020-07-08 Cryovac, LLC Apparatus and process for packaging a product

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