AU653868B2 - Plastics packaging strip and method - Google Patents
Plastics packaging strip and method Download PDFInfo
- Publication number
- AU653868B2 AU653868B2 AU28261/92A AU2826192A AU653868B2 AU 653868 B2 AU653868 B2 AU 653868B2 AU 28261/92 A AU28261/92 A AU 28261/92A AU 2826192 A AU2826192 A AU 2826192A AU 653868 B2 AU653868 B2 AU 653868B2
- Authority
- AU
- Australia
- Prior art keywords
- strip
- plastics
- groove
- extruded
- forming head
- 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
Links
- 239000004033 plastic Substances 0.000 title claims description 51
- 229920003023 plastic Polymers 0.000 title claims description 51
- 238000000034 method Methods 0.000 title claims description 30
- 238000004806 packaging method and process Methods 0.000 title description 11
- 239000003000 extruded plastic Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 17
- 238000005452 bending Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
AUSTRALIA
Patents Act 6538 6 COMPLETE SPECIFICATION
(ORIGINAL)
Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority: o Related Art: *5 a f a Int. Class APPLICANT'S REF.: Name(s) of Applicant(s): 0 4* Address(es) of Applicant(s): a Actual Inventor(s): NYLEX CORPORATION LIMITED 15th Floor, 390 St. Kilda Road, Melbourne, Victoria, Australia.
Geoffrey Charles Anderson Royston Douglas Bull Colin Arthur Hawke Peter Anthony Donnell Address for Service is: PHILLIPS, ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367. Collins Street Melbourne, Australia, 3000 Complete Specification for the invention entitled: PLASTICS PACKAGING STRIP i ND METHOD The following statement is a full description of this invention, including the best method of performing it known to applicant(s): P 19/11/77 2 PLASTICS PACKAGING STRIP AND METHOD 0 0 0 0 00 o o 00 00 00oo 0 0 o0o0 0000 0 0 000000 0 0 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.
Some manufactured articles have edges which require protection against abuse during handling and transport.
Generally the vulnerable edges constitute angles of about 900 and may be linear in the case of prism-shaped articles or curved or circular in the case of cylindrical shaped articles. There has been a need to produce a plastic packaging strip which can be applied to an edge in need of protection. It will hereinafter be convenient to 15 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.
In producing a plastic packaging strip to protect the edge of steel coils, rolls of strip material or the 20 like, it is desirable to produce 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 25 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.
Attempts have been made in the past to create a 30 workable hinge in a continuously formed elongate plastics strip enabling the strip to be bent into an L-shaped section. However these attempts have not been all together successful. To produce such plastics hinges it has previously usually been necessary to injection mould the hinge. This process is expensive and strips of indefinite length cannot be produced using this method. A number of attempts have been made to produce a strip with a hinge by extrusion processes. One attempt has involved the use of a V-shaped gouging device run along the length 3 of an extruded plastic strip. This method does not produce a hinge which is accurate enough to allow easy and consistent bending of the strip into an L-shaped section as it is difficult to produce a hinge by this method which is of consistent depth.
The problems associated with prior methods may be exacerbated when recycled polymeric material is employed, as such materials usually give rise to inconsistency in the extruded strip.
Accordingly, it is an object of the present invention to provide a method for producing an extruded plastics strip which overcomes one or more of the problems as described above.
S"It is also an object of the present invention to
S@
15 provide a novel plastic packaging strip which can easily S"e be bent about an angle of at least 900 According to the present invention there is provided 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 900, said method comprising: i) extruding a polymeric material to form a continuous
C.
plastics web; ii) passing said plastics web between pressure applying 25 means so to form a substantially flat plastics strip; and Siii) forming a groove in said plastics strip whilst it is ductile by applying a groove forming head to the 0 surface of the strip whilst moving the strip past e oe the groove forming head; wherein said groove forming head comprises a substantially shaped indenting portion and shoulder portions on either side of said indenting portion tapering away from said indenting portion.
Preferably 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 4 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.
Once the plastics web has been formed into a flat strip of the desired thickness it is moved past a groove forming head which forms a groove along the length of the plastics strip. Preferably 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 ses*: means of appropriate spring loading. However, the groove ee@S@* forming head may be positioned at a separate location.
o "15 In a preferred embodiment of the present invention 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. Preferably, the angular extent of this portion is 900 or greater. Most preferably it is between 1100 to 1600. The shoulder portions taper away from the indenting portion. The expression "taper away" as used in this specification means that the 25 shoulder portions are angled away from a pl~ne on top of the and perpendicular to its central axis. The angle S" between this plane and the respective shoulder portions is generally at least 0.5. Preferably it is between 0.50 to 100. This means that when the plastics strip S 30 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 0 0.50 to 10 In another aspect of the present invention there is provided 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 5 substantially shaped in cross section. The appearance of two grooves on opposite sides of the plastics strip when utilising the method of the invention is one surprising aspect of this invention which is described hereinafter.
In one embodiment of the present invention the plastics strip has cut away portions extending from one edge of the strip towards the hinge. Preferably, 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 Ssuch that the elongate strip can be applied to a curved 15 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 S: other side of the strip without adjacent tabs interfering or coming into contact with each other.
It will now be convenient to describe the invention with reference to a preferred embodiment illustrated in the accompanying drawings. It is to be understood that •e the drawings and following description relate to a preferred embodiment only, and are not intended to limit 25 the scope of the present invention.
Figure 1 is a schematic diagram of a manufacturing .oooo2 plant line in accordance with the present invention.
Figure 2 is a transverse cross section of a groove C forming head according to the present invention.
S 30 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 6 sheet 2 which then passes between pinch rollers 3 where the extruded sheet is rolled to a uniform desired thickness. In a preferred embodiment of the present invention 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 9**S*S Smay be filled with water to assist cooling of the extruded 15 sheet 2.
S.
Groove forming head 5 comprises a V-shaped indenting portion 6 adapted to form a V-shaped groove in extruded o.O strip 2. Preferably 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.
*e Groove forming head 5 further includes shoulder portions 7 on either side of V-shaped indenting portion 6. Preferably 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 0.50 to 100. Preferably taper angle 8 is 1.50. The angular S extent of V-shaped portion 6 may be 900 or greater. It S 30 is preferably about 1100 When sheet 2 passes between roller 4 and groove forming head 5, sheet 2 is indented by groove forming head such that a shaped groove 10 forms on one side of sheet 2. Preferably, sheet 2 is at a viscosity whereby the plastics material displaced by V-shaped portion 6 and shoulder portions 7, and groove 10 formed therein will be retained when the sheet further cools ie. the polymeric material of sheet 2 will not flow back on itself once groove 10 has been formed. V-shaped portion 6 may penetrate the majority of the thickness of sheet 2.
Preferably when the thickness of sheet 2 is about 2.5 mm, V-shaped portion 6 may penetrate to a depth of about mm into strip 2. However, anything between about 0.5 to 2.0 mm depth will provide adequate results.
As shoulder portions 7 are slightly tapered away from indenting portion 6, the initial groove formed in sheet 2 comprises a mirror image of the profile of groove forming head 5. When sheet 7 cools however a number of changes occur in the profile of the groove formed. First, 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 ao oo its original position in sheet 2 such that the upper 15 surface 11 of sheet 2 is substantially planar. If Soshoulder portions 7 were not tapered but were instead parallel to the plane of sheet 2, bulges might form on a 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 ?rior to use.
S*.
A further change which occurs to sheet 2 when further cooling occurs is that surprisingly, complimentary 25 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.
S 30 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 8 plurality of tabs 18 along the length of each strip. Cut away portions 17 may extend into groove 10. Tans 18 may be of an angle 19 of between 50 to 300 depending on the size of the item intended to be packaged. Preferably, 0 tabs 18 are angled 14 When tabs 18 are angled, 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.
0 Before being applied to the edge of the article, a
S.
15 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 •0 0 section as the strip may retain some memory to return 0S 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 1800 and then released to assume e4 the desired shape for application to the edge of an article. The strip formed into the L-shaped section may 25 then be applied to the edge of the article in need of 0 protection and affixed thereto by any suitable means, for some*% S" example stretch wrapped into place.
The strip may be made from any suitable extrudable •ooo• 0 polymeric material. The strip may be made from high S 30 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.
If the strip is made from high density polyethylene (which is the most preferred material), 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 9 forming head the polymer is preferably at a temperature of between 120 to 150 0
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.
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. shaped sections, shaped sections, box sections or the like.
Box sections enable the strip to be used as an o enveloping protective casing for appropriately shaped objects intended to be transported or otherwise exposed to .5 15 risk of damage.
It is also to be understood that various modifications, additions and/or alterations may be made to the parts previously described without departing from the S" ambit of the present invention as defined in the following claims.
S
*SS.
S.
Claims (2)
- 2. A method as claimed in claim 1 wherein the shoulder portions of the groove forming head are tapered such that when the plastic strip moves past the groove forming head the angle between the surface of the plastics strip and the respective shoulder portions is between 0.50 to
- 100. 3. A method as claimed in claim 2 wherein the angle 4 between the surface of the plastics strip and the respective shoulder portions is about 4. A method as claimed in any one of claims 1 to 3 wherein said substantially shaped indenting portion of the groove forming head has an angular extent of 900 or greater. A method as claimed in claim 4 wherein the angular extent of the substantially shaped portion of the groove forming head is between 110° to 160 6. A method as claimed in claim 5 wherein the angular extent of the substantially shaped portion of the groove forming head is about 110°. 7. A method as claimed in any one of the previous 11 claims wherein the pressure applying means comprises at least a pair of rollers through which the extruded plastics web is adapted to pass. 8. A method as claimed in any one of the previous claims wherein the plastics web is formed into a plastics strip between 2.0 to 5.0 mm in thickness. 9. A method as claimed in any one of claims 1 to 8 wherein the groove forming head is located adjacent to a rotating roller and the plastics strip is passed between thq said roller and the said groove forming head which is rotated in the opposite direction to the rotation of the adjacent roller. 10. A method as claimed in any one of the previous ooeoe S"claims wherein the groove forming head is maintained in 15 pressure contact with the plastics strip. 11. A method as claimed in any one of the previous claims wherein the groove formiiig head contacts the °i plastics strip when it is at a temperature such that once a groove is formed in the strip the plastics material does 20 not substantially thereafter flow back into the formed groove. S12. A method as claimed in any one of the previous claims wherein the plastics strip is formed from high density polyethylene. eoe 25 13. A method as claimed in claim 12 wherein the plastics 0 strip is at a temperature between 120 to 150 C when the groove forming head comes into contact with it. 14. A method as claimed in any one of the previous claims wherein the substantially shaped portitn of the gzoove forming head indents the plastics strip to fo.m a groove between 0.5 to 2.0 mm deep. A method substantially as hereinbefore described with reference to what is shown in the drawings. 16. An extruded polymeric strip having a hinge portion extending along the length thereof made in accordance with the method of any one of claims 1 to 17. An extruded plastics strip having at least one hinge portion extending along the length of the strip, eac' said <hinge portion consisting of a first longitudinally 12 extending groove on one side of the strip and a second longitudinally extending groove opposite said first groove 'nd located on the reverse si&e of the plastic strip wherein at least one of the respective longitudinal grooves 2s substantially shaped in cross-section. 18. An extruded plastics strip as claimed in claim 17 wherein said plastics strip has cut away portions extending from one edge of the strip towards the hinge. 19. An extruded plastics strip as claimed in claim 18 wherein the cut away portions extend just beyond the base of the hinge. An extruded plastics strip as claimed in either one of claims 18 and 19 wherein the cut away portions are located such that the plastics strip includes a plurality 15 of tabs on one side of the hinge. 21. An extruded plastics strip as claimed in claim S: :wherein the angle between the sides of adjacent tabs is between 5° to 22. An extruded plastics strip as claimed in any one of 20 claims 16 to 21 wherein the plastics material is high density polyethylene. 23. An extruded plastics strip as claimed in any onr of claims 16 to 22 wherein the depth of the shaped groove is between 0.5 to 2.0 mm and the total thickness of the 25 strip is about 2.5 mm. 24. An extruded plastics strip as claimed in any ou,. of claims 16 to 23 wherein the plastics strip comprise, one elongate hinge portion and the strip is adapted to be folded into an section- 25. An extruded plastics strip as claimed in any one of claimns 16 to 23 wherein the plastics strip comprises two elongate hinge portions and the strip is adapted to be folded into a section. 26. An extruded plastics strip as claimed in any one of claims 16 to 23 wherein the plastics strip comprises three elongate hinge portions and the strip is adapted to be folded into a box section. 27. An extruded plastics strip which has a profile which is substantially shaped which is formed by bending one 13 side of a plastics strip as claimed in any one of claims 16 to 24 about an angle of more tha" 900 with respect to the other side of the strip and th eafter releasing the strip from any bending force so to enable the strip to assume the desired profile. 28. An extruded plastics strip as claimed in any one claims 16 to 24 which is formed into an shaped profile using an apparatus comprising receiving means suitable for receiving the flat strip, bending means adapted to bend at least a portion of one side of said strip about an angle of more than 900 with respect to the other side of the strip and release means adapted to release the side of the strip subject to a bending force so that the stri. thereafter assumes a profile which is substantially "L" 15 shaped. 29. An extruded plastics strip as claimed in claim 28 o• wherein the bending means of the apparatus is adapted to bend at least a portion of one side of the plastics strip about an angle of about 180°. 30. An extruded plastics strip substantially as hereinbefore described with reference to either one of figures 4 and DATED: 9 August, 1994 PHILLIPS ORMONDE FITZPATRICK Attorneys for: NYLEX CORPORATION LIMITED 4679W ABSTRACT 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 900, said method 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 D 0 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 shaped indenting portion and shoulder portions on either side of said indenting pox ion tapering away from said indenting portion. o 8 4 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU28261/92A AU653868B2 (en) | 1991-11-13 | 1992-11-11 | Plastics packaging strip and method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPK9458 | 1991-11-13 | ||
| AUPK945891 | 1991-11-13 | ||
| AU28261/92A AU653868B2 (en) | 1991-11-13 | 1992-11-11 | Plastics packaging strip and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2826192A AU2826192A (en) | 1993-05-20 |
| AU653868B2 true AU653868B2 (en) | 1994-10-13 |
Family
ID=25620622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU28261/92A Ceased AU653868B2 (en) | 1991-11-13 | 1992-11-11 | Plastics packaging strip and method |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU653868B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2541932A1 (en) * | 1983-03-04 | 1984-09-07 | Rambaud Jean Michel | Method for folding a sheet of rigid plastic and for coating a panel by means of such a sheet, and decorative panels obtained thereby |
-
1992
- 1992-11-11 AU AU28261/92A patent/AU653868B2/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2541932A1 (en) * | 1983-03-04 | 1984-09-07 | Rambaud Jean Michel | Method for folding a sheet of rigid plastic and for coating a panel by means of such a sheet, and decorative panels obtained thereby |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2826192A (en) | 1993-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC | Assignment registered |
Owner name: COREX PLASTICS (AUSTRALIA) PTY LTD Free format text: FORMER OWNER WAS: NYLEX CORPORATION PTY LTD |