AU2007203422A1 - Tool for heat-sealing and separating of continuously conveyed film made of a thermoplastic material - Google Patents

Tool for heat-sealing and separating of continuously conveyed film made of a thermoplastic material Download PDF

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Publication number
AU2007203422A1
AU2007203422A1 AU2007203422A AU2007203422A AU2007203422A1 AU 2007203422 A1 AU2007203422 A1 AU 2007203422A1 AU 2007203422 A AU2007203422 A AU 2007203422A AU 2007203422 A AU2007203422 A AU 2007203422A AU 2007203422 A1 AU2007203422 A1 AU 2007203422A1
Authority
AU
Australia
Prior art keywords
tool
separating
covering sheet
sealing
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU2007203422A
Inventor
Marcel Tremp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferag AG
Original Assignee
Ferag AG
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 Ferag AG filed Critical Ferag AG
Publication of AU2007203422A1 publication Critical patent/AU2007203422A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • 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
    • B29C65/30—Electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7433—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a wire
    • 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
    • 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
    • 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
    • B29C66/818—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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
    • B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
    • B65B61/10—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting using heated wires or cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—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
    • B29C66/90—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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining 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
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2905/00—Use of metals, their alloys or their compounds, as mould material
    • B29K2905/08—Transition metals
    • B29K2905/12—Iron

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)

Description

AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant(s): FERAG AG Invention Title: Tool for heat-sealing and separating of continuously conveyed film made of a thermoplastic material The following statement is a full description of this invention, including the best method for performing it known to me/us: 2 TOOL FOR HEAT-SEALING AND SEPARATING OF CONTINUOUSLY CONVEYED FILM MADE OF A THERMOPLASTIC MATERIAL (c CI Field of the invention eC The invention is in the field of packaging technology and concerns an tool which is suitable for heat-sealing and Sseparating continuously conveyed film made of a thermoplastic material.
Background of the invention Known devices comprising tools of the above mentioned type are used e.g. for processing a tubular film material being created by longitudinal heat-sealing of at least one quasi endless web of plastic film polyethylene or polypropylene film) in a continuous procedure and in which flat objects are arranged in spaced succession. The known processing consists in transversally heat-sealing the film tube between the objects and in separating it directly after or substantially simultaneously with the heatsealing, such that by means of each heat-sealing and separating step one object is individually packaged.
The mentioned method is applied to package e.g. individual printed products such as newspapers or magazines or small stacks of printed products into mostly transparent plastic film. It is however also possible to package other objects in the same manner, using correspondingly adapted devices of the described type or to produce individual empty bags by transversal heat-sealing and separation of superposed webs of film.
In such devices for heat-sealing and separating, the films N.\Melbourne\Cases\Patent\72000-72999\P72468.AU\SpeciB\P72468.AU.GHSPEC.doc 23/07/07 -3- Q) are usually held between a heated tool and a counter tool, wherein the two tools are moved along a short distance (sealing path) together with the film. For this purpose Sthe devices usually comprise a plurality of tools and a plurality of counter tools which are arranged revolving in opposite directions and are driven in a mutually C synchronized manner, such that, upstream of the sealing M path, the tools and counter tools move towards the films C from both sides, that during their movement along the sealing path tools and counter tools are pressed together, and, downstream of the sealing path, tools and counter tools move away from the films. The circuits of the tools and counter tools are often circular, but may have other shapes.
The tools are bars and reach over the width of the films to be heat-sealed and separated. Advantageously the tools are not only equipped for heat-sealing and separating but also for pinning the films down. This is advantageous especially for films, which, before they are clamped between tool and counter tool, are positioned at a relatively large distance from each other. The tools thus comprise e.g. three elements, which are advantageously movable in relation to each other perpendicularly to the films to be heat-sealed and separated. A central element is equipped as separating element and the elements arranged upstream and downstream of the central separating element serve for pinning down and heat-sealing, or the central element is heatable and simultaneously serves as heat-sealing and separating element, the elements upstream and downstream of the separating/heating element merely serving for pinning down the film material.
An example for a device of the mentioned kind is described in the publication WO 2005/118402. This device comprises a plurality of tools which substantially consist of a heatsealing/separating element and advantageously pinning-down N\Melbourne\Cases\Patent\72000-72999\P72468.AU\Specia\P72468 .AU.GSPEC.doc 23/07/07 4 elements arranged on the upstream and the downstream side of the heat-sealing/separating element, wherein the pinning-down elements are arranged resiliently in a M direction perpendicular to the film material relative to the heat-sealing/separating elements. As counter tool a suitably coated conveying belt is provided, which is C slightly deflected through the pressure exerted by the C heat-sealing/separating elements during the heat-sealing Cl and separating process. The heat-sealing/separating elements comprise two heated heat-sealing surfaces, which Smeet in an obtuse angle to form a separating edge where they meet. The heat-sealing surfaces have a width in conveying direction of approximately 0.5 to 1 cm.
The heat-sealing/separating elements described above usually comprise a steel bar with a ceramic core. They use a lot of heat energy (according to WO 2005/118402 approximately 500 W per bar), are costly in production and relatively heavy.
Brief description of the invention It is the object of the invention to create a tool of the named kind, which is suitable for transverse heat-sealing and separation of films, especially in cooperation with a conveying belt as counter tool and which enables as reliable such heat-sealing and separation as known such tools. Therein the tool according to the invention is to be able to be produced in a simpler process than the known tools and is to be able to combine large output with small energy consumption. The tool according to the invention is to be especially suited for being used in the device as described in publication WO 2005/118402, it may however, also be applied in other devices which serve the same purpose.
The tool according to the invention is based on the N\Melbourne\Cases\Paent\72000-72999\P72468.AU\SpecisP72468.AU.GHSPEC.doc 23/07/07 Q)finding that the heat-sealing surfaces of the known heatsealing/separating elements, which meet in the separating edge, only act on films in the direct proximity of the M separating edge when they are used in co-operation with a conveying belt or a correspondingly equipped counter tool, C i.e. only a small section of their width is actually used C and therefore the sealing surfaces could be considerably M less wide.
The tool according to the invention is therefore not bar- Sshaped like known tools but consists of a plurality of thin layers which are juxtaposed in sandwich-manner, e.g.
in parallel to each other. Two outermost layers of the sandwich construction are formed of a folded sheet, advantageously of stainless steel, the fold edge of which serves as separating edge. Between the two parts of the covering sheet, which meet at the fold edge, a heating element is fitted, which comprises an equally flat and slim support made of an electrically insulating material and a heating wire wound around the support. The multilayer tool has the shape of a sword and is of a thickness which may be 2 mm or even less. The outer curvature radius of the covering sheet at the fold edge is e.g. 1 mm or less.
The tool according to the invention is able to be produced in a very simple process. Furthermore it is considerably lighter than the known tools, which serve the same purpose, by which its operation in circulation can be effected with simpler means and with less energy. Heatsealing and separation using the tool according to the invention necessitates relevantly less heating energy than this is the case for known tools. A further relevant advantage of the tool according to the invention is the fact that, due to its small width, it is able to carry out transverse heat-sealing and separation when the distances between the objects to be packaged are very small and even N:\Melbourne\Caaes\Patent\72000-72999\P72468.AU\Specis\P72468.AU.GHSPEC.doc 23/07/07 6 Q- when the objects are of a relevant thickness of e.g.
several centimetres. With the tool according to the c-i invention it is actually possible to package e.g.
Smagazines which are conveyed at distances of only 4 to mm from each other. Such small distances between the objects to be packaged results, at identical conveying Cq speeds, in larger output than is possible using a device Cequipped with known tools or in lower speed for an (C identical output. In addition it economizes on film material.
As above described for the tools according to the publication WO 2005/118402, the tool according to the invention is advantageously equipped with means for pinning-down being arranged resiliently in a direction perpendicularly to the film to be processed in relation to the centrally arranged heat-sealing/separating element. It is also possible to provide only one pinning-down element.
Brief description of the drawings A preferred embodiment of the tool according to the invention for heat-sealing and separating of continuously conveyed film made of a thermoplastic material is described in detail in connection with the following Figs., wherein: Figure 1 shows the tool according to the invention, viewed parallel to the conveying direction of the films to be processed; Figure 2 is a cross section through the tool according to the invention; Figure 3 is a partly exploded representation of the tool according to the invention; NM\Melbourne\Caaea\Patent\72000-72999\P72468.AU\Specis\P72468.AU.GHSPEC.doc 23/07/07 -7- Q)Figure 4 shows a further embodiment of the separating edge of the tool according to the invention.
M Detailed description of the invention Figure 1 shows a preferred embodiment of the tool C according to the invention viewed parallel to the Sconveying direction of the films to be processed. The tool C 1 has a length L, which at least corresponds to the width of the films to be processed, and a height H of e.g. 2 to cm. The covering sheet 2 is advantageously folded twice in the same direction, wherein one of the fold edges forms the separating edge 3. On the fold edge 4 opposite the separating edge 3, the covering sheet comprises two openings 5 through which the heating wire extends. On the one side of the tool which is visible in Fig. i, the longitudinal edge regions of the covering sheet overlap and are possibly connected with each other with suitable means not shown spot welding).
Figure 2 shows the tool 1 according to Fig. 1 in cross section. Its elements are denominated with the same reference numerals as in Fig. i. In Fig. 2 the overlapping longitudinal edge regions 2.1 and 2.2 of the covering sheet 2 are clearly visible.
On the inside of the twice-folded covering sheet 2, two insulating layers 10 are arranged and between the insulating layers the heating element, which comprises a flat support 11 made of an electrically insulating material and a heating wire 6 wound around the support 11.
Figure 3 shows the components of the tool according to the invention in a partly exploded representation, from which the heating wire 6 wound around the support 11 is clearly visible.
N\Melbourne\Caes\Paten\72000-72999\P72468.A\SpeciB\P72468.AU.GHSPEC.doc 23/07/07 8 Q- As mentioned above, the covering sheet 2 is e.g. made of stainless steel and has a thickness of approximately 0.4 mm (0.3 to 0.6 mm). The two insulating layers 10 and the Ssupport 11 consist e.g. of fibre-cement (commercially available e.g. under the trade name of "Eternit") and have a thickness in the same range as the thickness of the ^C covering sheet 2. The total thickness D of the tool can Cthus be as small as approximately 2 mm, wherein with the ^C named materials a sufficient stability for operation of the tool is achieved all the same. The fold edge of Scovering sheet 2, which forms the separating edge 3, hereby has an outer curvature radius of approximately 1 mm.
The insulating layer 10 and the support 11 are advantageously arranged on the inside of the folded covering sheet in such a manner that a cavity 20 is formed in the region of the separating edge. This means that the insulating layers 10 and the support 11 are arranged such that their longitudinal edges directed towards the separating edge 3 are distanced from the inner surface of the covering sheet, wherein advantageously the distance between the covering sheet 2 and the longitudinal edge is larger for the support 11 than for the insulating layers It is not necessary for the arrangement of insulating layers 10 and support 11 in the region of the fold edge of covering sheet 2 to be symmetrical, as shown in Fig. 2.
Fig. 4 shows an asymmetrical embodiment in which the longitudinal edge of one insulating layer 10 is distanced further from the separating edge 3 of the cover sheet than the longitudinal edge of the other insulating layer 10, by which an even smaller curvature radius 0.5 mm) for the covering sheet 2 is made possible.
The tool as substantially shown in Figs. 1 to 3 can be N.\Mebourne\Ca.es\Patent\72000-72999\P72468.AU\Specis\P?2468.AU.GHPEC.doc 23/07/07 9 operated at a length L of 50 cm and at an operating temperature of approximately 200 to 250°C with a heating -s power of merely approximately 200 to 250 W, wherein M initial heating of the region of the separating edge to 200 0 C is achieved in merely approximately 3 seconds (to C 250*C in approximately 5 seconds).
C Further exemplified embodiments of the inventive tool C< comprise the following characteristics: C The covering sheet is folded only once and the edge opposite the separating edge is covered with other means, e.g. a cap made of plastic material, or is open; The insulating elements 10 are not designed as independent parts but as corresponding coatings of the inside of the covering sheet; The heating wire is not extending through the covering sheet on the edge opposite the separating edge but laterally; The covering sheet only consists of metal in the region of the separating edge, the lateral parts of it consisting of an electrically insulating material and functioning as insulating layers also.
In this specification, except where the context requires otherwise, the words "comprise", "comprises", and "comprising" means "include", "includes", and "including", respectively. That is, when the invention is described or defined as comprising specified features, various embodiments of the same invention may also include additional features.
It is to be understood that, if any prior art publication N.\Melbourne\Caaes\Patezn\72000-72999\P72468.AU\SpeCis\P72468.A.GHSPEC.doc 23/07/07 10 is referred to herein, such reference does not constitute an admission that the publication forms a part of the commnon general knowledge in the art, in Australia or any M other country.
N:\Melbourne\Caoee\Patcnt\72OOO-72999\P72468 .AU\Specia\P72468.AU.GHSPEC.doc 23/07/07

Claims (9)

1. Tool for heat-sealing and separation of substantially continuously conveyed films made of a C thermoplastic material, which tool is an electrically ^C heatable heat-sealing/separating element with a separating Sedge and comprises: C- a folded covering sheet constituting two outer layers of the tool and comprising a fold edge constituting Sthe separating edge, and an inner layer comprising a flat support of an electrically insulating material and a heating wire wound around the support.
2. Tool according to claim 1, wherein the covering sheet is metallic and wherein between the covering sheet and the support two further inner layers of an electrically insulating material are arranged.
3. Tool according to any one of claims 1 or 2, wherein the electrically insulating material is a fibre-cement.
4. Tool according to any one of claims 1 to 3, wherein the covering sheet consists of stainless steel.
Tool according to any one of claims 1 to 4, wherein, in the region of the separating edge, there is a cavity between the covering sheet and the inner layers.
6. Tool according to any one of claims 1 to 5, wherein the covering sheet has a thickness of between 0.3 to 0.6 mm and wherein the inner layers have thicknesses in the same range.
7. Tool according to any one of claims 1 to 6, wherein the covering sheet is folded twice, wherein on the fold N\Melbourne\Case\Patent72000-72999\P72468.AU\Specis\P72468.AU.GHSPEC.doc 23/07/07 12 edge opposite the separating edge openings for the heating wire are provided. M
8. Use of the tool according to any one of claims 1 to 7 in a device for transverse heat-sealing and separation of a tubular film material, in which a row of mutually C distanced printed products is arranged. C<
9. Use according claim 8, wherein, in the device, the tool co-operates with a conveying belt. Tool substantially as hereinbefore described with reference to the accompanying drawings. N\Melbourne\Case\Patent\72000-72999\P72468AU\Specia\P72468.AU.GHSPEC.doc 23/07/07
AU2007203422A 2006-08-02 2007-07-23 Tool for heat-sealing and separating of continuously conveyed film made of a thermoplastic material Abandoned AU2007203422A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH12442006 2006-08-02
CH1244/06 2006-08-02

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AU2007203422A1 true AU2007203422A1 (en) 2008-02-21

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EP (1) EP1884469B1 (en)
AU (1) AU2007203422A1 (en)
CA (1) CA2595417A1 (en)
DE (1) DE502007001173D1 (en)
DK (1) DK1884469T3 (en)

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CN106253195A (en) * 2016-08-31 2016-12-21 合肥凯泉电机电泵有限公司 Submersible pump controls cable seal structure

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Publication number Priority date Publication date Assignee Title
US3035381A (en) * 1959-01-09 1962-05-22 George A Hosso Plastic bag sealer
GB8928799D0 (en) * 1989-12-20 1990-02-28 Du Pont Canada Self voiding jaw for packaging machine
GB9804866D0 (en) * 1998-03-07 1998-04-29 Ceetak Developments Limited Cutting and/or sealing sheet or roll plastics material
CA2568587C (en) * 2004-06-02 2013-04-30 Ferag Ag A method and device for packaging flat objects

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EP1884469A1 (en) 2008-02-06
CA2595417A1 (en) 2008-02-02
EP1884469B1 (en) 2009-07-29
DE502007001173D1 (en) 2009-09-10
DK1884469T3 (en) 2009-11-09

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MK1 Application lapsed section 142(2)(a) - no request for examination in relevant period