WO1993009931A1 - Bande de plastique pour emballage et son procede de fabrication - Google Patents

Bande de plastique pour emballage et son procede de fabrication Download PDF

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Publication number
WO1993009931A1
WO1993009931A1 PCT/AU1992/000605 AU9200605W WO9309931A1 WO 1993009931 A1 WO1993009931 A1 WO 1993009931A1 AU 9200605 W AU9200605 W AU 9200605W WO 9309931 A1 WO9309931 A1 WO 9309931A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
plastics
forming head
groove forming
extruded
Prior art date
Application number
PCT/AU1992/000605
Other languages
English (en)
Inventor
Geoffrey Charles Anderson
Royston Douglas Bull
Colin Arthur Hawke
Peter Anthony Donnell
Original Assignee
Nylex Corporation Limited
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 Nylex Corporation Limited filed Critical Nylex Corporation Limited
Publication of WO1993009931A1 publication Critical patent/WO1993009931A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/02—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage
    • B65D81/05—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage maintaining contents at spaced relation from package walls, or from other contents
    • B65D81/053—Corner, edge or end protectors
    • B65D81/054—Protectors contacting two generally perpendicular surfaces of the packaged article, e.g. edge protectors
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B29C53/06—Forming folding lines by pressing or scoring
    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/007—Narrow strips, e.g. ribbons, tapes, bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/02—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage
    • B65D2581/05—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage maintaining contents at spaced relation from package walls, or from other contents
    • B65D2581/051—Details of packaging elements for maintaining contents at spaced relation from package walls, or from other contents
    • B65D2581/052—Materials
    • B65D2581/055—Plastic in general, e.g. foamed plastic, molded plastic, extruded plastic

Definitions

  • the present invention relates to plastic packaging, more particularly it relates to a plastics packaging strip to protect the edge of an article and a method for making the strip.
  • edges which require protection against abuse during handling and transport-
  • the vulnerable edges constitute angles of about 90° and may be linear in the case of prism-shaped articles or curved or circular in the case of cylindrical shaped articles.
  • plastic packaging strip which can be applied to an edge in need of protection. It will hereinafter be convenient to describe the invention with application to use to protect rolled steel coils or rolls however it will be appreciated that the invention has a wider application.
  • a plastic packaging strip to protect the edge of steel coils, rolls of strip material or the like
  • an elongate packaging strip having a hinge means extending along the length thereof to enable the said strip to be bent into an L-shaped section so as to be applied to the edge in need of protection.
  • the hinge means must be formed with precision in order that the packaging strip can be bent into shape precisely and the strip itself is preferably flat so that the strip may be coiled for transport prior to application to the product intended to be protected.
  • a method for producing an extruded plastics strip having a substantially uniform hinge extending along the length of said strip to enable the strip to be bent about an angle of at least about 90° comprising: i) extruding a polymeric material to form a continuous plastics web; ii) passing said plastics web between pressure applying means so to form a substantially flat plastics strip; and iii) forming a groove in said plastics strip whilst it is ductile by applying a groove forming head to the surface of the strip whilst moving the strip past the groove forming head; wherein said groove forming head comprises a substantially "V" shaped indenting portion and shoulder portions on either side of said indenting portion tapering away from said indenting portion.
  • the pressure applying means comprises at least a pair of rollers through which the extruded plastics web is adapted to pass.
  • the rollers are spaced so to compress the plastics web into a subtantially flat strip.
  • the thickness of the plastics strip after passing through the pressure applying means may be varied depending on the thickness of the desired end product. However, preferably it is compressed to a thickness ranging between 2.0 to 5.0 mm.
  • the groove forming head is located adjacent to a roller so that the plastics strip passes between a rotating roller and an oppositely rotating groove forming head which is maintained in pressure contact with the plastics strip; generally by means of appropriate spring loading.
  • the groove forming head may be positioned at a separate location.
  • the plastics strip is passed through a pair of pinch rollers prior to passing the strip between the groove forming head and roller.
  • the groove forming head has a substantially "V" shaped indenting portion.
  • the angular extent of this portion is 90° or greater. Most preferably it is between 110 to 160°.
  • the shoulder portions taper away from the indenting portion.
  • the expression “taper away” as used in this specification means that the shoulder portions are angled away from a plane on top of the "V" and perpendicular to its central axis. The angle between this plane and the respective shoulder portions is generally at least 0.5°. Preferably it is between 0.5 to 10 . This means that when the plastics strip moves past the groove forming head the angle between the surface of the plastics strip and the shoulder portions of the head is the same as above; namely, preferably between 0.5° to 10°.
  • an extruded plastics strip having at least one hinge portion extending along the length of the strip, each said hinge portion consisting of longitudinally extending grooves on both sides of said strip wherein at least one of the respective longitudinal grooves is substantially "V" shaped in cross section.
  • the plastics strip has cut away portions extending from one edge of the strip towards the hinge.
  • the cut away portions extend just beyond the base of the hinge.
  • the cut away sections may be such that the elongate strip on one side of the hinge comprises a plurality of tabs which can be bent into an L-shaped section with the other side of the strip.
  • the sides of the tabs may be angled such that the elongate strip can be applied to a curved edge e.g. on the-edge of a rolled steel coil such that the elongate strip is applied to the curved surface and adjacent tabs are bent into an L-shaped section with the other side of the strip without adjacent tabs interfering or coming into contact with each other.
  • Figure 1 is a schematic diagram of a manufacturing plant line in accordance with the present invention.
  • Figure 2 is a transverse cross section of a groove forming head according to the present invention.
  • Figure 3 is an enlargement of the indenting portion of the head shown in Figure 2.
  • Figure 4 is a plan of an extruded section made in accordance with the present invention.
  • Figure 5 is a transverse cross section of the groove portion of an extruded section made in accordance with the present invention when completed.
  • Particulate polymeric material is fed into a conventional sheet extruder 1 where it is heated.
  • the polymeric material emerges from the extruder as a hot sheet 2 which then passes between pinch rollers 3 where the extruded sheet is rolled to a uniform desired thickness.
  • the width of the sheet is a number of times greater than the desired width of the finished strip so as to allow the production of a plurality of parallel formed strips at any one time.
  • Extruded sheet 2 continues to cool after emerging from pinch rollers 3 before it is passed through roller 4 and groove forming head 5.
  • Roller 4 is preferably smooth ie. the roller is cylindrical and has no indentations or projections on its surface.
  • Pinch rollers 3 and roller 4 may be conventional rollers used in polymeric sheet extrusion. Said rollers may be filled with water to assist cooling of the extruded sheet 2.
  • Groove forming head 5 comprises a V-shaped indenting portion 6 adapted to form a V-shaped groove in extruded strip 2.
  • groove forming head 5 is a wheel or roller or the like having a V-shaped rib around its circumference.
  • Groove forming head 5 may be spring-tensioned to press against strip 2 with a consistent pressure.
  • Groove forming head 5 further includes shoulder portions 7 on either side of V-shaped indenting portion 6.
  • shoulder portions 7 are not parallel to the plane of sheet 2 but are angled so as to taper away from indenting portion 6.
  • Taper angle 8 may be from 0.5° to 10 .
  • Preferably taper angle 8 is 1.5°.
  • the angular extent of V-shaped portion 6 may be 90° or greater. It is preferably about 110°.
  • V-shaped portion 6 may penetrate the majority of the thickness of sheet 2.
  • the thickness of sheet 2 is about 2.5 mm, V-shaped portion 6 may penetrate to a depth of about 1.5 mm into strip 2. However, anything between about 0.5 to 2.0 mm depth will provide adequate results.
  • the initial groove formed in sheet 2 comprises a mirror image of the profile of groove forming head 5.
  • the initial groove formed in sheet 2 comprises a mirror image of the profile of groove forming head 5.
  • tapered portions formed on either side of the V-shaped groove by shoulder portions 7 tend to disappear as a result of displaced polymeric material returning towards its original position in sheet 2 such that the upper surface 11 of sheet 2 is substantially planar. If shoulder portions 7 were not tapered but were instead parallel to the plane of sheet 2, bulges might form on either side of groove 10 which would inhibit proper formation of a hinge enabling folding of the strip into an L-shaped section.- It would also create difficulties for proper coiling of the protective polymeric strip for transportation prior to use.
  • a further change which occurs to sheet 2 when further cooling occurs is that surprisingly, complimentary groove 12 forms on lower surface 13 of sheet 2 adjacent groove 10 as a result of shrinking of stressed polymeric material which was displaced by V-shaped portion 6. Complimentary groove 12 and groove 10 cooperate to form a hinge 14. If sheet 2 is to be divided into a plurality of strips having a groove formed therein, a plurality of groove forming head may be provided across the width of sheet 2.
  • a slitting station 15 may be provided to divide sheet 2 into a plurality of packaging strips. Strips may pass through finishing rollers which may emboss the surface of the strips.
  • Strips may then pass to punch 16 where cut away portions 17 are stamped from the strips so as to form a plurality of tabs 18 along the length of each strip. Cut away portions 17 may extend into groove 10.
  • Tabs 18 may be of an angle 19 of between 5 to 30 depending on the size of the item intended to be packaged. Preferably, tabs 18 are angled 14 .
  • a strip may be applied to the edge of a curved article such as a rolled steel coil so that when adjacent tabs are bent into the L-shaped section they do not interfere or come into contact with each other.
  • After passing from punch 16 the strips may then be coiled for transport. The rolled strips may then be transported to the site for use to be applied to the edge of a manufactured article requiring protection.
  • a post-forming apparatus may be provided to bend the strip about hinge 14 into an L-shaped section.
  • the post forming apparatus may bend the strip beyond the desired L-shaped section as the strip may retain some memory to return towards its former flat profile. By overbending the strip the memory of the strip may be taken into account such that the strip will return to an L-shaped section.
  • the strip may be bent about 180 and then released to assume the desired shape for application to the edge of an article.
  • the strip formed into the L-shaped section may then be applied to the edge of the article in need of protection and affixed thereto by any suitable means, for example stretch wrapped into place.
  • the strip may be made from any suitable extrudable polymeric material.
  • the strip may be made from high density polyethylene or polypropylene.
  • the strip may be made from a recycled thermoplastic polymeric material.
  • the strip may be provided with an embossed surface which may be applied at any suitable stage during the process. This enables use of other wrapping materials over the strip with less slippage.
  • the temperature of the polymer when passed through pinch rollers may be in the order of 190 to 200 C and when moved past the groove forming head the polymer is preferably at a temperature of between 120 to 150°C.
  • Rollers 3 and 4 may be any suitable rollers known in the art.
  • Groove forming head may be made from brass or the like.
  • hinges Whilst the present invention has been described in relation to a hinge to form an L-shaped section, it will be appreciated that a plurality of hinges may be formed in a sheet so that other shaped sections and shapes may be formed, eg. "U" shaped sections, M S M shaped sections, box sections or the like.
  • Box sections enable the strip to be used as an enveloping protective casing for appropriately shaped objects intended to be transported or otherwise exposed to risk of damage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Procédé de fabrication d'une bande extrudée en plastique comportant une pliure substantiellement uniforme s'étendant sur la longueur de la bande de manière à pouvoir plier la bande avec un angle d'au minimum environ 90°, ledit procédé comprend: (i) extrusion d'un matériau polymère formant une bande plastique continue; (ii) faire passer ladite bande plastique entre des dispositifs appliquant une pression de manière à obtenir une bande plastique substantiellement plate; et (iii) formation d'une gorge dans ladite bande plastique alors qu'elle est malléable en appliquant une couronne de formation de gorge sur la surface de la bande pendant que la bande se déplace au-delà de la couronne de formation de gorge; selon ce procédé, ladite couronne de formation de gorge comprend une zone d'empreinte en forme de 'V' et des épaulements situés de chaque côté de la zone d'empreinte et de section conique prolongeant ladite zone d'empreinte.
PCT/AU1992/000605 1991-11-13 1992-11-11 Bande de plastique pour emballage et son procede de fabrication WO1993009931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPK9458 1991-11-13
AUPK945891 1991-11-13

Publications (1)

Publication Number Publication Date
WO1993009931A1 true WO1993009931A1 (fr) 1993-05-27

Family

ID=3775819

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1992/000605 WO1993009931A1 (fr) 1991-11-13 1992-11-11 Bande de plastique pour emballage et son procede de fabrication

Country Status (2)

Country Link
NZ (1) NZ245092A (fr)
WO (1) WO1993009931A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6183840B1 (en) 1995-12-04 2001-02-06 Nylex Corporation Limited Edge protector strip
US6458448B1 (en) * 1996-09-06 2002-10-01 Itw Limited Edge protector

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5166364A (en) * 1964-11-12 1967-05-11 Palmer & Douglass Pty. Ltd Hinge
US3434435A (en) * 1966-06-30 1969-03-25 Achermann W Propping means for packing and transporting requisites
US3955677A (en) * 1974-06-03 1976-05-11 Cornerboard, Inc. Cornerboard protector
JPS57125006A (en) * 1981-01-28 1982-08-04 Mitsubishi Plastics Ind Ltd Method for forming groove in plastic sheet or tube
FR2541932A1 (fr) * 1983-03-04 1984-09-07 Rambaud Jean Michel Procede de pliage d'une plaque de matiere plastique rigide et de placage d'un panneau au moyen d'une telle plaque, et panneaux decoratifs ainsi obtenus
EP0150097A2 (fr) * 1984-01-18 1985-07-31 Ferry Pickering (Sales) Limited Pliage de feuilles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5166364A (en) * 1964-11-12 1967-05-11 Palmer & Douglass Pty. Ltd Hinge
US3434435A (en) * 1966-06-30 1969-03-25 Achermann W Propping means for packing and transporting requisites
US3955677A (en) * 1974-06-03 1976-05-11 Cornerboard, Inc. Cornerboard protector
JPS57125006A (en) * 1981-01-28 1982-08-04 Mitsubishi Plastics Ind Ltd Method for forming groove in plastic sheet or tube
FR2541932A1 (fr) * 1983-03-04 1984-09-07 Rambaud Jean Michel Procede de pliage d'une plaque de matiere plastique rigide et de placage d'un panneau au moyen d'une telle plaque, et panneaux decoratifs ainsi obtenus
EP0150097A2 (fr) * 1984-01-18 1985-07-31 Ferry Pickering (Sales) Limited Pliage de feuilles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, M-169, page 108; & JP,A,57 125 006 (MITSUBISHI JUSHI K.K.), 4 August 1982. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6183840B1 (en) 1995-12-04 2001-02-06 Nylex Corporation Limited Edge protector strip
US6458448B1 (en) * 1996-09-06 2002-10-01 Itw Limited Edge protector

Also Published As

Publication number Publication date
NZ245092A (en) 1994-06-27

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