EP2474412A2 - Vorrichtung und Verfahren für eine verbesserte Herstellung von Luftpolsterelementen - Google Patents

Vorrichtung und Verfahren für eine verbesserte Herstellung von Luftpolsterelementen Download PDF

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Publication number
EP2474412A2
EP2474412A2 EP11189492A EP11189492A EP2474412A2 EP 2474412 A2 EP2474412 A2 EP 2474412A2 EP 11189492 A EP11189492 A EP 11189492A EP 11189492 A EP11189492 A EP 11189492A EP 2474412 A2 EP2474412 A2 EP 2474412A2
Authority
EP
European Patent Office
Prior art keywords
web
thermoplastic material
machine
heating
longitudinal
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.)
Withdrawn
Application number
EP11189492A
Other languages
English (en)
French (fr)
Other versions
EP2474412A3 (de
Inventor
Calogero Stella
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.)
Fill Teck Srl
Original Assignee
Fill Teck Srl
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 Fill Teck Srl filed Critical Fill Teck Srl
Publication of EP2474412A2 publication Critical patent/EP2474412A2/de
Publication of EP2474412A3 publication Critical patent/EP2474412A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D5/00—Multiple-step processes for making three-dimensional [3D] articles
    • B31D5/0039—Multiple-step processes for making three-dimensional [3D] articles for making dunnage or cushion pads
    • B31D5/0073—Multiple-step processes for making three-dimensional [3D] articles for making dunnage or cushion pads including pillow forming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D2205/00—Multiple-step processes for making three-dimensional articles
    • B31D2205/0005—Multiple-step processes for making three-dimensional articles for making dunnage or cushion pads
    • B31D2205/0011—Multiple-step processes for making three-dimensional articles for making dunnage or cushion pads including particular additional operations
    • B31D2205/0047—Feeding, guiding or shaping the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D2205/00—Multiple-step processes for making three-dimensional articles
    • B31D2205/0005—Multiple-step processes for making three-dimensional articles for making dunnage or cushion pads
    • B31D2205/0076—Multiple-step processes for making three-dimensional articles for making dunnage or cushion pads involving particular machinery details
    • B31D2205/0082—General layout of the machinery or relative arrangement of its subunits

Definitions

  • the present invention relates to the field of machines for making packaging material, in particular comprising cushions inflated with air or other gas, and precisely it relates to a machine for making this packaging material.
  • the invention relates to a method for making such packaging material.
  • Such cushions made usually of high density polyethylene owing to its mechanical resistance, which is remarkably higher than other plastic materials, can be made as a continuous strip of cushions placed adjacent to one another, used both for wrapping the product to package and for avoiding the movement of the product in a container in which it is housed for being transported.
  • a first kind of machines for making these cushions provides overlapping two films of high density polyethylene, unwound from respective coils and conveyed towards heating elements capable of melting locally the plastic material forming on it welding lines.
  • the film of plastic material are, firstly, welded along longitudinal regularly distant lines, obtaining welding lines parallel to the conveying direction with formation of tubular chambers.
  • the tubular chambers are inflated with air and then are closed hermetically by making transversal welding lines that define the air cushions in combination with the longitudinal lines.
  • Machines also exist to make, without stopping the web, a single chain of air cushions. These machines start from a web comprising two overlapped films of thermoplastic material with transversal welding lines and a first longitudinal welding line already made in a previous process, in order to define respective chambers open at a side. The machine provides to inflate air between the two films, in order to inflate the chambers defined by the transversal lines and by the first longitudinal line, and to provide at the same time, by means of heating elements, the second longitudinal welding line that was missing and that blocks the air in the chambers, obtaining the air cushions. This way, the machine can operate continuously, i.e. without stopping the web.
  • the web provides the transversal welding lines that are shorter than the width of the web and a third longitudinal welding line external opposite to the first longitudinal welding line, leaving, thus an open passageway for inflating the air.
  • This is carried out introducing longitudinally an inflation tube, and making in the meantime the second longitudinal line by means of longitudinal heating elements after that each cushion is inflated.
  • the welding is made at the inner edge of the passageway, leaving out the inflation tube by cutting the third longitudinal line.
  • the machine also comprises a device for longitudinal movement of the web comprising a plurality of conveying rollers arranged at an edge of the heating elements.
  • a longitudinal guide protrudes upstream, on which the web is put for engaging the passageway by the inflation tube.
  • the web is conveyed through the machine by means of belts arranged longitudinally to the web and mounted to a plurality of rollers.
  • belts arranged longitudinally to the web and mounted to a plurality of rollers.
  • heating the thermoplastic material of the web for making the longitudinal welding line is effected by two heating elements that transmit the heat necessary for softening the thermoplastic material through respective non-stick tapes, made normally of Teflon, that are arranged for transmitting the heat.
  • the non-stick tapes for transmitting the heat have to be moved longitudinally to the web of thermoplastic material at the same speed, in order to avoid the production of folds.
  • the presence of these non-stick tapes increases the maintenance costs because it requires a frequent replacement.
  • an apparatus is described to provide inflated articles obtained starting from a web consisting of two overlapped films.
  • the apparatus provides a sealing roller that operates in combination with a counter-roller for actuating the web along the machine and for sealing the same.
  • the external roller sealing surface can be equipped with a groove in which a heating element is housed.
  • a means for conveying the heat can engage the outer surface of the roller.
  • supports of ceramic material are provided having apertures through which heating elements irradiate the heat to melt the web. Even this solution does not provide a precise melting of the web owing to the distance of the heating elements from the web and to the distance between the different heating elements that cause a non-uniform heating of the web.
  • the, or each, heating rod is fixed. This provides a uniform heating of the web melting it to obtain a welding line with high precision.
  • said coating material has a thermal conductivity coefficient less than about 0, 3 W/mK.
  • the coating outer of the heating rod can be made in polytetrafluoroethylene (PTFE), or Teflon.
  • the means for moving said web of thermoplastic material comprises at least a first and a second counter rotating rollers arranged downstream of said heating means and at opposite sides with respect to said web of thermoplastic material, said first and second counter rotating rollers having respective gripping surfaces configured to be put adjacent to said first and to said second film of said web, respectively, in order to apply a pulling action on said web and to drag it along said feeding direction.
  • the counter rotating rollers have a high friction surface.
  • the counter rotating rollers are made of a high friction material selected from the group consisting of:
  • the counter rotating rollers have a irregular surface, for example rough, or knurled, in order to increase the gripping force on said web of thermoplastic material.
  • At least one of the counter rotating rollers comprises a first portion which is made of a high friction material, such as rubber, or an elastomeric material, and a second portion of a metal material.
  • a high friction material such as rubber, or an elastomeric material
  • the portion of a metal material has said irregular surface, for example rough, or knurled.
  • it is the metal surface that, in use, produces the gripping action on the web.
  • At least one of the gripping surfaces of said first and of said second counter rotating rollers has a circumferential groove, at said circumferential groove aligned, in use, said longitudinal welding line made by said heating means. This way, it is avoided that the still hot thermoplastic material can stick to the gripping surface of said first and/or of said second roller.
  • a level means is provided for levelling said softened thermoplastic material, in order to finish said longitudinal welding line.
  • the level means can comprise a pushing element arranged on one side of said web and an abutment surface located opposite to the pushing element with respect to the web of thermoplastic material, said pushing element arranged to compress said thermoplastic material locally softened against said abutment surface, in order to finish the welding line.
  • the abutment surface is made on a disc movable along a direction substantially orthogonal to said longitudinal direction of said web biased by resilient means, for example a spring.
  • the pushing element can comprise a disc having a flat surface that is arranged, in use, next to said locally softened web to provide said welding line.
  • the heating rod comprises a main body and a heating portion protruding from said main body, said heating portion arranged, in use, to provide a longitudinal strip of softened material on said web.
  • a stretching means can be provided for stretching the web of thermoplastic material before it reaches said heating means. This way, it is ensured that the heating means make correctly the welding line on the thermoplastic material.
  • the stretching means comprises a first stretching roller and a second stretching roller arranged at opposite sides with respect to the web.
  • the first and second stretching rollers squeeze the web avoiding also that the gas jet, for example air, emitted by the blowing means reaches the heating means jeopardizing the correct operation.
  • a longitudinal guide is provided on which said web is put, for example manually by an operator, before starting the machine.
  • the longitudinal guide is adapted, in use, to cross a longitudinal passageway made in said web of thermoplastic material. More in detail, the longitudinal passageway is defined through a plurality of transversal welding lines that separate a plurality of tubular bodies defined between said first and second sheets.
  • the transversal welding lines define a plurality of tubular bodies. More precisely, the transversal lines have a length less than the transversal width of the web of thermoplastic material, in order to form said passageway in which in use said guide is put. Once inflated by the gas between the two films of thermoplastic material the passageway is closed by making said longitudinal welding line and then closing the above described tubular bodies. This way, it is eventually obtained the formation of chambers in which a certain amount is present of gas closed hermetically by the transversal welding lines and by said longitudinal welding line.
  • the first and the second sheet of the web can be defined through a folding line made on a single sheet of thermoplastic material and therefore the only edge that was longitudinally open is that in which the longitudinal welding line is made by the heating means.
  • the web of thermoplastic material, opposite to the welding line has a longitudinal welding line made in a preliminary step.
  • a means can be provided for cutting said web of thermoplastic material arranged to provide a longitudinal cut to open longitudinally said passageway, to make it possible an arrangement of the inflating portion between said sheets and to make it possible a movement of the web with chambers inflate and sealed.
  • the cutting means longitudinally cuts the tubular web of thermoplastic material at the portion of the web without the transversal welding lines.
  • a sealing means is provided arranged to avoid the outlet of air, or other gas, through the longitudinal cut made by the means for cutting, during the inflation by the gas.
  • the cutting means is arranged upstream of the heating means.
  • thermoplastic material tear lines can be provided that assist the separation between two air cushions.
  • a machine 1 for making packaging material in the form of cushions 100 of gas comprises feeding rollers 21 and 22 arranged to bring a web 10 of thermoplastic material along a longitudinal conveying direction 101.
  • Web 10 comprises, as well known, two films 10a and 10b overlapped and can be unwound starting from a roll 20.
  • web 10 can comprise two longitudinal welding lines 13a and 13b and a plurality of transversal welding lines 11, in order to define a plurality of transversal tubular bodies 16 arranged to be insulated pneumatically from one another.
  • the tubular bodies 16 can be obtained folding a single sheet of thermoplastic material and obtaining a single longitudinal welding line at the edges to connect.
  • transversal tear lines 12 can be provided between two consecutive transversal welding lines 11. More precisely, transversal tear lines 12 extend for all the width of web 10 and assist the separation of a cushion 100 from the next one when they are used.
  • the transversal welding lines 11 have in particular length less than the transversal width L of web 10, in order to define between welding line 13b and their beginning point a open passageway 18.
  • web 10 is put at passageway 18 on a longitudinal guide 30 arranged downstream of feeding rollers 21 in the conveying direction of web 10.
  • guide 30 is arranged next to inflating means 35 having a hole 35a through which a predetermined amount of gas, for example air, can be put into the passageway 18, so that air inflates the chamber of each tubular body 16.
  • Hole 35 is in pneumatic connection with a source of a gas flow, for example a fan not shown in the figures.
  • a cutting blade 80 is present that can make a longitudinal cut 14 on web 10. This allows the movement of transversal portion 35b of the inflating means 35 during the movement of web 10 through machine 1.
  • a heating means for heating web 10, arranged to cause a local melting of the thermoplastic material along a longitudinal line 15.
  • the heating means 50 comprise at least one heating rod 51, and/or rod 52, can be in particular a elongated rod, that, in use, stops and is arranged in contact of web 10 for causing it to a local softening.
  • two heating rods 51 and 52 can be provided arranged at opposite sides with respect to web 10.
  • a means can be provided for approaching, or withdrawing, two heating rods 51 and 52. More precisely, the means for approaching, or withdrawing are adapted to withdraw the two heating rods 51 and 52 to allow web 10 to be arranged easily between thereof. Then, the means for approaching, or withdrawing are adapted to approach the two heating rods 51 and 52, in order to be put adjacent, or near to, the respective surfaces of web 10.
  • the, or each, heating rod 51, and/or 52 comprises an electric resistance 53 coated with an outer layer 54 of a material having a low thermal transmission coefficient, for example less than about 0,5 W/mK such as polytetrafluoroethylene (PTFE), or Teflon.
  • PTFE polytetrafluoroethylene
  • Teflon a material having a low thermal transmission coefficient, for example less than about 0,5 W/mK
  • the heating rod 51, or 52 causes the softening of the thermoplastic material of web 10 to provide the longitudinal welding line 15 avoiding at the same time that it can adhere to the heating rod 51, or 52.
  • a feeding means comprising a first and a second counter rotating rollers 71 and 72 arranged at opposite sides with respect to web 10. More in detail, the counter rotating rollers 71 and 72 apply directly on web 10 a tension which causes it to be fed through machine 1. This is possible since rollers 71 and 72 have a high friction surface. Rollers 71 and 72 can be made of a high friction material such as rubber, or in an elastomeric material, such as Vulcolan ®. This technical solution allows also to avoid that the thermoplastic material of web 10, still hot near the longitudinal welding line 15, can adhere to the surface of rollers 71 and 72.
  • rollers 71 and 72 have a irregular surface, for example rough, or knurled.
  • At least one of counter rotating rollers 71, or 72, for example the roller next to the lower face of web 10 in movement along machine 1, may comprise a portion 75 made of a metal material and equipped with a knurled surface.
  • Such particular exemplary embodiment avoids the use of conveyor belts commonly used for causing the movement of the web in the machines of the prior art.
  • At least one among the first and the second counter rotating rollers 71, 72 comprises a first portion 73 made of a high friction material selected from the group consisting of: a synthetic rubber, a natural rubber or an elastomeric material, and a second portion 75 of a metal material.
  • a first portion 73 made of a high friction material selected from the group consisting of: a synthetic rubber, a natural rubber or an elastomeric material, and a second portion 75 of a metal material.
  • This in particular, can be equipped with a knurled surface.
  • rollers 71 and 72 has a circumferential groove 74 to which, in use, the longitudinal welding line 15 made by the heating means 50 on web 10 can align.
  • welding line 15 which has the shape of a bead and is still at a softening temperature, enters directly into contact with the surface of rollers 71 and 72.
  • thermoplastic material still hot can damage the rubber surface, or elastomeric surface, of counter rotating rollers 71 and/or 72.
  • a level means can be provided 60 for levelling the softened thermoplastic material, in order to complete the longitudinal welding line 15.
  • the heating means 50 have a heating portion 55 of the thermoplastic material protruding from a main body 56 towards web 10.
  • the heating portion 55 has a short small width, for example set between 1 mm and 2 mm, that is arranged to form a longitudinal strip of softened material 17 on web 10 of width substantially corresponding to about 1-2 mm.
  • the strip of softened material 17 is brought, then, to the level means 60 that cause it to be squeezed and therefore an increase of the width up to 2-4 mm obtaining welding line 15.
  • the means 60 for levelling can comprise a pushing element 61 arranged on one side of web 10, and an abutment surface 62 located opposite to the pushing element 61 with respect to the web of thermoplastic material 10. More in detail, the pushing element 61, for example at a flat surface 66, compresses the thermoplastic material, softened by the heating means 50, against the abutment surface 62, in order to level the softened material of welding line 15.
  • the abutment surface 62 can be made, for example, on a disc 65 movable along a direction 160 substantially orthogonal to the longitudinal direction of web 10, biased by resilient means, for example a spring 63.
  • the abutment surface 62 is, in particular made of a heat-resistant material for example in Polyphenylene sulfide, for example Techtron ®.
  • a stretching means can be provided 40 arranged to stretch web 10 of thermoplastic material before it is subjected to local heating.
  • the stretching means 40 can comprise a first stretching roller 41 and a second stretching roller 42 arranged at opposite sides with respect to web 10.
  • the first and second stretching rollers 41 and 42 squeeze against each other web 10 avoiding also that the gas jet, for example air, emitted by the blowing means 35 arranged upstream of the stretching means 40 can arrive at the heating means 50 jeopardizing the correct operation.

Landscapes

  • Making Paper Articles (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Laminated Bodies (AREA)
  • Buffer Packaging (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP11189492A 2010-11-23 2011-11-17 Vorrichtung und Verfahren für eine verbesserte Herstellung von Luftpolsterelementen Withdrawn EP2474412A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPI2010A000133A IT1403360B1 (it) 2010-11-23 2010-11-23 Macchina perfezionata per la produzione di materiale per imballaggio sotto forma di cuscini di aria, o altro gas, e relativo metodo di produzione

Publications (2)

Publication Number Publication Date
EP2474412A2 true EP2474412A2 (de) 2012-07-11
EP2474412A3 EP2474412A3 (de) 2012-10-24

Family

ID=43742941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11189492A Withdrawn EP2474412A3 (de) 2010-11-23 2011-11-17 Vorrichtung und Verfahren für eine verbesserte Herstellung von Luftpolsterelementen

Country Status (2)

Country Link
EP (1) EP2474412A3 (de)
IT (1) IT1403360B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105818440A (zh) * 2015-01-09 2016-08-03 上海名优办公设备有限公司 气泡机
CN106363955A (zh) * 2015-07-22 2017-02-01 上海名优办公设备有限公司 气泡机的热封装置
US20240001638A1 (en) * 2020-11-13 2024-01-04 Ranpak Corp. Dunnage conversion machine and method with assisted tear apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060218880A1 (en) 2005-04-05 2006-10-05 Sealed Air Corporation (Us) Apparatus and method for forming inflated articles
US20080250753A1 (en) 2007-04-12 2008-10-16 Sealed Air Corporation (Us) Apparatus and method for making inflated articles
US7490449B1 (en) 2007-08-13 2009-02-17 Ralph Eibert Method and apparatus for making dunnage

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL123041A (en) * 1998-01-25 2001-05-20 Nova Tek Technologies Ltd Apparatus and method for making pouches
US7146778B2 (en) * 2005-03-24 2006-12-12 Lupoki Development Gmbh Apparatus for producing packaging air-cushion elements

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060218880A1 (en) 2005-04-05 2006-10-05 Sealed Air Corporation (Us) Apparatus and method for forming inflated articles
US20080250753A1 (en) 2007-04-12 2008-10-16 Sealed Air Corporation (Us) Apparatus and method for making inflated articles
US7490449B1 (en) 2007-08-13 2009-02-17 Ralph Eibert Method and apparatus for making dunnage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105818440A (zh) * 2015-01-09 2016-08-03 上海名优办公设备有限公司 气泡机
CN106363955A (zh) * 2015-07-22 2017-02-01 上海名优办公设备有限公司 气泡机的热封装置
CN106363955B (zh) * 2015-07-22 2019-05-07 上海名优办公设备有限公司 气泡机的热封装置
US20240001638A1 (en) * 2020-11-13 2024-01-04 Ranpak Corp. Dunnage conversion machine and method with assisted tear apparatus
US12179454B2 (en) * 2020-11-13 2024-12-31 Ranpak Corp. Dunnage conversion machine and method with assisted tear apparatus

Also Published As

Publication number Publication date
ITPI20100133A1 (it) 2012-05-24
IT1403360B1 (it) 2013-10-17
EP2474412A3 (de) 2012-10-24

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