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WO1991004849A1 - Materiau d'emballage ameliore et machine de fabrication d'un tel materiau - Google Patents

Materiau d'emballage ameliore et machine de fabrication d'un tel materiau Download PDF

Info

Publication number
WO1991004849A1
WO1991004849A1 PCT/AU1990/000462 AU9000462W WO9104849A1 WO 1991004849 A1 WO1991004849 A1 WO 1991004849A1 AU 9000462 W AU9000462 W AU 9000462W WO 9104849 A1 WO9104849 A1 WO 9104849A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
machine
edges
edge
rollers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AU1990/000462
Other languages
English (en)
Inventor
George B. Saray
Clive Harry Maxwell Townsend
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.)
Corex Plastics Australia Pty Ltd
Original Assignee
Corex Plastics Australia Pty Ltd
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 Corex Plastics Australia Pty Ltd filed Critical Corex Plastics Australia Pty Ltd
Publication of WO1991004849A1 publication Critical patent/WO1991004849A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • 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
    • B29L2024/00—Articles with hollow walls
    • B29L2024/006—Articles with hollow walls multi-channelled
    • 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

  • the present invention relates to an improved packaging material and a machine for manufacturing same. More particularly the invention relates to improvements in twin-walled corrugated plastic sheet material known under one trade mark as Fluteboard, and a machine for making the improvements.
  • Fluteboard comprises two thin walls of polypropelene material spaced apart by parallel closely spaced webs which are moulded integrally with the walls.
  • the webs thus provide parallel tubular cavities which extend across the sheet between two opposite sides and the cavities are open at their ends.
  • the twin-walled packaging material has many and varied uses, mainly in the packaging industry, as a partition to separate goods as well as for forming containers for goods, to quote merely two examples.
  • One of the many advantages of the material over corrugated cardboard for example, is its durability which renders it reusable.
  • One popular use is to provide a platform between layers of stacked glass bottles, the completed stack being shrink-wrapped for transportation and storage purposes.
  • the corners of each sheet of Fluteboard are rounded to prevent the sharp corners penetrating the plastic shrink wrapping material, although a problem can still arise if a relatively sharp edge exists along the normal edge of the material which can occur particularly where a sheet is cut or finishes along an edge parallel to said webs and between two webs. In this case the edges of the walls of polypropelene can be somewhat sharp.
  • one form of the invention provides a twin-walled sheet formed of plastics material and comprising spaced planar walls joined by webs extending therebetween, characterised in that, said walls are joined together by welding along edges of the sheet to provide a generally rounded edge, in section, thereby sealing the space between the walls against contamination from externally.
  • a further form of the invention provides a machine for manufacturing improvements to a twin walled sheet formed of plastics material and having spaced planar walls joined by integrally moulded webs extending therebetween, characterised in that, said machine included transport means for conveying said sheet through said machine, heater means for applying heat along an edge of said sheet as it is transported past said heater means and squeeze rollers located past said heater means in the direction of conveying of said sheet and adjacent said heater means, said squeeze rollers applying pressure to said edge to squeeze said spaced walls together along said edge whereby the walls are welded together to form a sealed edge which is substantially rounded in section.
  • Figure 1 is a perspective view of an improved twin-walled sheet according to the invention
  • Figure 2 is a section on the line 2-2 of Figure 1
  • Figure 3 is a side elevation of a machine for manufacturing the improvement to the sheet shown in Figures 1 and 2,
  • Figure 4 is an end view of the machine shown in Figure 3 showing only the end portion of the machine
  • Figure 5 is a plan view of the machine shown in Figures 3 and 4, but with only one half of the machine shown in detail since the other half is essentially a mirror image, and
  • Figure 6 is a sectional view on the line 6-6 of Figure 5 -
  • the twin-walled sheet is shown to comprise a generally rectangular sheet 10, which comprises two spaced planar walls 11 separated by parallel webs 12 which are moulded integrally with the walls 11.
  • the sheet shown in Figures 1 and 2 is formed from known twin-walled sheet and involves turning the walls 11 towards each other around the edges of the sheet and welding them together to form a rounded edge 13 which extends entirely around the perimeter of the sheet 10.
  • the corners of the sheet Prior to forming the rounded edge 13 the corners of the sheet are rounded as shown in Figure 1 so that there are no sharp points or sharp edges which may be likely to cause problems when the sheet is used in the packaging industry, particularly if it is used inside a shrink wrapped package.
  • the existing twin-walled sheet is made of polypropelene, heat and pressure are used to weld the planar walls 11 together around the edges of the sheet. According to the finished sheet the tubular cavities 14 between the webs 12 are not externally accessible. In other words the cavities are sealed against the ingress of contaminants and thus, the sheet is easily cleaned for reuse.
  • the machine for manufacturing the sheet is shown to comprise essentially a mainframe 15 supporting a pair of transverse linear bearings 16, the linear bearings 16 supporting a pair of tables 17 which extend along the length of the machine and are separated from each other along the longitudinal centre line. Further linear bearings 18 mount the respective tables on the linear bearings 16.
  • a handle and pulley assembly 19 on each side of the machine drives chains 20 to rotate screw 21 ( Figure 6) which, when rotated, causes the respective tables to move in a transverse direction whereby the tables may be drawn close together or further apart. Only one handle and pulley assembly is shown in the drawings ( Figures 3 and 6).
  • An endless belt 22 is mounted on each of the tables 17 and extends substantially along the length of the machine over pulleys 23, one of which in each case is driven by an electric motor 24 through gearbox 24a.
  • the electric motor drives the pulley 23 by means of chain 25 which extends between a sprocket on the output shaft of motor 24 and a further sprocket 26 which is fixed to spline 27-
  • the spline 27 engages sprockets 28, 28a which depend, respectively, from a mounting assembly on the underside of the tables 17-
  • Parallel drive chains 38, 39 from the sprockets 28, 28a respectively ensure that the motor 24 serves to drive the pulleys 23 of each table as well as a roller 40 on each table.
  • each endless belt 22 is coplanar with the top surface of the respective table 17 whereby a generally planar surface is formed for transportation of a twin-walled sheet along the length of the machine during which time conventional sheet is formed into the improved sheet of the invention.
  • the sheet is in a horizontal plane when being transported.
  • a series of pairs of rollers 29 bear on the upper surface of the endless belt 22 and are each spring loaded by spring 41 so as to be raised slightly when the sheet passes along the belts such that the rollers force the sheet against the respective belts 22.
  • a guide roller 30 is arranged on each of the tables 17 at the input end of a sheet.
  • the transverse position of the tables in adjusted such that each guide roller 30 bears on an opposite edge of the sheet as it is fed into the machine.
  • a sheet fed into the machine is a conventional twin-walled sheet except the corners are rounded prior to feeding into the machine in the manner shown in Figure 1.
  • the guide rollers 30 are free running rollers, that is they are not driven to rotate. Once the sheet is fed past the guide rollers 30 it comes between the first set of rollers 29 and the belt 22 on each table 17 and is conveyed through the machine in a direction left to right in Figures 3 and 5-
  • a first heater 31 is arranged to apply heat to the edge of the sheet, that is, the edge parallel to the direction of travel in each case.
  • the heaters 31 have a bight 42 ( Figure 6) which surrounds the edge of the sheet to ensure that heat is concentrated at the edge.
  • the heaters 31 are conventional electric heaters which can be purchased "off the shelf”.
  • the heated edge comes between squeeze rollers 32 whereby the walls 11 of the sheet are forced together at the edges and because of the pressure and heat which is applied, they are welded together to form the rounded edge 13-
  • the rollers 32 are configured so as to form the rounded edge 13 * Cooling means (not shown) adjacent the squeeze rollers 32 and downstream thereof in the direction of travel of the sheet 10 ensures that the edge of the sheet is cooled after it passes the squeeze rollers 32. Such cooling may be by means of air or water.
  • the second heaters 33 are again arranged adjacent the opposite edges of the sheet and again have a bight portion which concentrates the heat towards the opposite sides of the sheet, but in the case of the second heaters 33 they are arranged further inwardly as evident in Figure 5 » that is, towards each other slightly more than the first heaters. This ensures that heat applied to the sheet 10 is applied slightly inwardly of the edges. In this way it is ensured that heat is applied around the corners of the sheet in a direction along the leading and trailing edge of the sheet.
  • the leading and trailing edges are the edges which extend transverse to the direction of travel.
  • the grooved rollers 34 are each mounted for rotation about an axle, which axle may also be pivoted so as to move towards and away from the sheet 10.
  • the grooved rollers are in fact mounted on pivotal arms 35 which are actuated by pneumatic cylinders 3 causing the rollers to move towards the longitudinal centre line of the machine or outwardly in the opposite direction.
  • the second of the two rollers 34 that is, the roller which is further downstream, is in a position inwardly towards the centre line of the machine such that it is encountered by the leading edge of the sheet 10 as it progresses through the machine.
  • a light sensor (not shown) detects the position of the leading edge when it contacts the second of the rollers 3 and actuates the relevant pneumatic cylinder 3 to cause the roller 34 to move outwardly around the rounded edge of the sheet 10 to a position where it is in contact with the edge of the sheet 10 parallel to the direction of travel.
  • the first of the rollers 34 is actuated by means of its pneumatic cylinder to move inwardly and follow the edge of the sheet 10 around the corner to the trailing edge of the sheet.
  • the grooved rollers have grooves which form the rounded edge on the sheet 10 particularly around the corners thereof.
  • the second heater 33 and the grooved rollers 34 are not required.
  • the rounded edges are not critical to the final usage of the sheet, it is only necessary to seal those edges which are transverse to the direction of the tubular cavities 14 in which case it is only necessary to pass the sheet once through the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

Une feuille à paroi double (10) en matière plastique comporte des parois planes espacées (11) jointes par des membranes parallèles (12) s'étendant entre les bords parallèles opposés de la feuille, de façon à former des cavités tubulaires. Les parois sont tournées vers l'intérieur en direction l'une de l'autre autour du périmètre de la feuille et sont soudées ensemble, de façon à former un bord de section généralement ronde qui ainsi scelle les cavités pour empêcher toute contamination de l'extérieur. La feuille présente des angles arrondis. Une machine de formage de bords arrondis comprend des transporteurs à bandes parallèles (22) servant à transporter la feuille à travers la machine, ainsi que des organes chauffants (31) disposés adjacents à ces bords opposés. Les organes chauffant chauffent le bord de la feuille et une paire de rouleaux pinceurs (32) situés à chacun des bords compriment les parois l'une contre l'autre au niveau de leur bord, permettant ainsi leur soudage. Un autre organe chauffant (33) placé sur chaque côté et des rouleaux rainurés (34) permettent de former le bord soudé autour des angles.
PCT/AU1990/000462 1989-09-26 1990-09-26 Materiau d'emballage ameliore et machine de fabrication d'un tel materiau Ceased WO1991004849A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ659389 1989-09-26
AUPJ6593 1989-09-26

Publications (1)

Publication Number Publication Date
WO1991004849A1 true WO1991004849A1 (fr) 1991-04-18

Family

ID=3774236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000462 Ceased WO1991004849A1 (fr) 1989-09-26 1990-09-26 Materiau d'emballage ameliore et machine de fabrication d'un tel materiau

Country Status (1)

Country Link
WO (1) WO1991004849A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0537753A1 (fr) * 1991-10-15 1993-04-21 Heller, William C., Jr. Procédé et appareil de fermeture des bords de plaques alvéolaires
WO1994002364A1 (fr) * 1992-07-16 1994-02-03 Korpak Limited Ebauche thermoplastique ondulee de recipient
EP0641641A1 (fr) * 1993-09-07 1995-03-08 Airex Sa Procédé pour la déformation du bord d'un matériau sanwich
WO1996001180A1 (fr) * 1994-07-06 1996-01-18 Fra.Mo Snc Di Franca Riva & C. Etancheification d'une plaque de materiau
EP0805016A4 (fr) * 1995-11-14 2001-02-21 Kishimoto Sangyo Co Procede de fusion d'un panneau creux de resine synthetique et panneau creux obtenu par ce procede
GB2358831A (en) * 1999-12-10 2001-08-08 Smith David S Packaging Sealing fluted sheet material
GB2359778A (en) * 2000-01-24 2001-09-05 Keith Unwin A method and apparatus for sealing an edge of an extruded plastics board.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU892566A (en) * 1966-07-27 1968-02-01 Continuous heat sealing apparatus
US3654043A (en) * 1969-11-28 1972-04-04 William I Jacobi Movable heat-sealing apparatus
GB1294736A (en) * 1969-10-15 1972-11-01 Hesser Ag Maschf Device for continuously producing welding or sealed seams on thermoplastic wrapping films
US4128451A (en) * 1977-04-04 1978-12-05 The Aro Corporation Roller members for use in heat sealing apparatus
US4146419A (en) * 1976-01-30 1979-03-27 Sarna Kunststoff Ag Welding device for welding plastic strips
US4395254A (en) * 1978-10-27 1983-07-26 Schuster Samuel J Apparatus for making disposable, breathable receptacles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU892566A (en) * 1966-07-27 1968-02-01 Continuous heat sealing apparatus
GB1294736A (en) * 1969-10-15 1972-11-01 Hesser Ag Maschf Device for continuously producing welding or sealed seams on thermoplastic wrapping films
US3654043A (en) * 1969-11-28 1972-04-04 William I Jacobi Movable heat-sealing apparatus
US4146419A (en) * 1976-01-30 1979-03-27 Sarna Kunststoff Ag Welding device for welding plastic strips
US4128451A (en) * 1977-04-04 1978-12-05 The Aro Corporation Roller members for use in heat sealing apparatus
US4395254A (en) * 1978-10-27 1983-07-26 Schuster Samuel J Apparatus for making disposable, breathable receptacles

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0537753A1 (fr) * 1991-10-15 1993-04-21 Heller, William C., Jr. Procédé et appareil de fermeture des bords de plaques alvéolaires
US5384002A (en) * 1991-10-15 1995-01-24 William C. Heller, Jr. Fluted plasticboard sealing apparatus
WO1994002364A1 (fr) * 1992-07-16 1994-02-03 Korpak Limited Ebauche thermoplastique ondulee de recipient
US5597111A (en) * 1992-07-16 1997-01-28 Korpak Limited Corrugated thermoplastic blank for a container
EP0641641A1 (fr) * 1993-09-07 1995-03-08 Airex Sa Procédé pour la déformation du bord d'un matériau sanwich
WO1995007173A1 (fr) * 1993-09-07 1995-03-16 Airex Ag Procede de deformation du bord d'un materiau en sandwich
WO1996001180A1 (fr) * 1994-07-06 1996-01-18 Fra.Mo Snc Di Franca Riva & C. Etancheification d'une plaque de materiau
EP0805016A4 (fr) * 1995-11-14 2001-02-21 Kishimoto Sangyo Co Procede de fusion d'un panneau creux de resine synthetique et panneau creux obtenu par ce procede
GB2358831A (en) * 1999-12-10 2001-08-08 Smith David S Packaging Sealing fluted sheet material
GB2359778A (en) * 2000-01-24 2001-09-05 Keith Unwin A method and apparatus for sealing an edge of an extruded plastics board.
EP1120229A3 (fr) * 2000-01-24 2001-12-05 Keith Unwin Dispositif d'étanchéification

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