AU4387899A - Creación de Inventos y Patentes con Inteligencia Artificial

AU4387899A – System for stretch-wrapping
– Google Patents

AU4387899A – System for stretch-wrapping
– Google Patents
System for stretch-wrapping

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Publication number
AU4387899A

AU4387899A
AU43878/99A
AU4387899A
AU4387899A
AU 4387899 A
AU4387899 A
AU 4387899A
AU 43878/99 A
AU43878/99 A
AU 43878/99A
AU 4387899 A
AU4387899 A
AU 4387899A
AU 4387899 A
AU4387899 A
AU 4387899A
Authority
AU
Australia
Prior art keywords
film
core
stretching
roller
wrapping system
Prior art date
1998-06-19
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.)

Granted

Application number
AU43878/99A
Other versions

AU746189B2
(en

Inventor
Philip Doran
Alan Dunne
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.)

Marmions Ltd

Original Assignee
Marmions 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.)
1998-06-19
Filing date
1999-06-21
Publication date
2000-01-05

1999-06-21
Application filed by Marmions Ltd
filed
Critical
Marmions Ltd

2000-01-05
Publication of AU4387899A
publication
Critical
patent/AU4387899A/en

2002-04-18
Application granted
granted
Critical

2002-04-18
Publication of AU746189B2
publication
Critical
patent/AU746189B2/en

2019-06-21
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

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Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL

B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING

B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging

B—PERFORMING OPERATIONS; TRANSPORTING

B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL

B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING

B65B67/00—Apparatus or devices facilitating manual packaging operations; Sack holders

B65B67/08—Wrapping of articles

B65B67/085—Wrapping of articles using hand-held dispensers for stretch films

Abstract

The invention provides a wrapping system for stretch-wrap plastic film. Plastic film (25) is partially pre-stretched by a selected amount and then relaxed prior to winding on a core (14). The film (25) is subsequently further stretched as it is drawn from the core (14) immediately prior to wrapping a load on a pallet, for example. The partial pre-stretching is preferably carried out in a number of steps by leading film (25) from a roll (10) over three rollers (15, 16, 17) in turn. These rollers (15, 16, 17) are driven at different speeds, the third roller (17) having a greater speed than the second roller (16) which in turn has a greater speed than the first roller (15). Thus, the film (25) is stretched in three steps prior to relaxing the film (25) and winding the relaxed film (25) on a core (14). The core (14) can be mounted on a hand-held dispenser which applies the final stretch to the film (25).

Description

WO99/65775 PCT/IE99/00056 SYSTEM FOR STRETCH-WRAPPING This invention relates to a wrapping system for stretch wrap plastic film and in particular linear low density polyethylene films. 5 Stretch-wrap plastic film has been widely used for some time for wrapping and securing a load on a pallet for example. More recently the provision of a pre-stretched wrapping film has been proposed. The use of a pre 10 stretched wrapping film advantageously uses dramatically less material. The processes and apparatus for producing such a pre-stretched plastic film for wrapping have not however been entirely successful and such pre-stretched films have not gained widespread acceptance in use. 15 The present invention is directed towards providing an improved wrapping system for stretch-wrap plastic film which is simple and efficient to use. 20 According to the invention there is provided a wrapping system for stretch-wrap plastic film, comprising: partially pre-stretching a plastics film by a desired amount, 25 relaxing the film, and further stretching the partially pre-stretched film immediately prior to using the pre-stretched film 30 for wrapping. Advantageously the second stretching of the film immediately prior to application reactivates the memory of the plastic material causing shrinkage after 35 application to firmly wrap and secure a load on a pallet WO99/65775 PCT/IE99/00056 – 2 for example. In a preferred embodiment after relaxing the film, the film is wound on a core, the further stretching being 5 carried out as the film is drawn from the core for use. The ratio of the elongations of the film during the pre stretching step and during the further stretching step is about 3:1. 10 In one embodiment of the invention the total stretching of the film is between 150% and 250%. Most preferably the total stretching of the film is about 200%. 15 Preferably the pre-stretching and relaxing elongates the plastics film by about 140 – 160% and the final stretching of the film immediately prior to application gives about a 15 – 20% further elongation of the pre stretched film. It has been found that this controlled 20 double stretching of the plastics film gives better results than the prior art in which the plastics film is fully stretched in one step. In a preferred embodiment the pre-stretching of the 25 plastics film is carried out in a number of steps. Ideally the pre-stretching is carried out in three steps giving in step 1 about 100% elongation, in step 2 about 30% elongation and in step 3 about 20% elongation. 30 In a further embodiment the film is stretched by feeding the film from a supply roll around two or more spaced apart film stretching rollers, each roller rotating at a greater speed than the roll or roller immediately upstream to stretch the film between the rollers. 35 In a particularly preferred embodiment the pre-stretched WO99/65775 PCT/IE99/00056 -3 film is loosely wound onto the core. This advantageously prevents collapse of the core due to the shrinkage in the film after winding. Preferably the film is loosely wound onto the core by feeding film off the final stretching 5 roller at a speed greater than the speed at which the film is wound up on the core. A further disadvantage with existing pre-stretched wrapping film systems is that when the film is pulled 10 from the core for wrapping edge hang-ups tend to cut the film if it is drawn off the core at an angle which is often the case when wrapping a pallet or the like. Edge hang-ups are generated because the pre-stretched film is extremely thin and is not a problem generally with 15 conventional stretch film. This problem can be overcome according to the invention by leading the film off the core whilst maintaining the line of take-off where the film parts from the core substantially parallel to the central rotational axis of the core. Thus the film is 20 evenly drawn off the core initially prior to application about the goods to be wrapped. Preferably the film is drawn from the core around a take off roller which rotatably engages against an outer 25 surface of the core. This ensures that the film is evenly drawn from the core and it can be then applied at any desired angle onto the materials to be packaged downstream of the take-off roller. 30 In a preferred embodiment the final stretching of the film is carried out by leading the film from the core around a final stretch roller, the speed of the final stretch roller being greater than the speed of discharge of film from the core. 35 Conveniently the final stretch roller is drivably WO 99/65775 PCT/IE99/00056 -4 connected to the take-off roller through a gear drive which ensures rotation of the final roller at a desired speed greater than the take-off roller to achieve the desired final stretch of the film. Alternatively the 5 final stretch roller may be geared to a rotational support for the core to achieve the same result. In another aspect the invention provides a method for producing a partially pre-stretched plastics film for 10 subsequent stretching and wrapping about a load. The invention will be more clearly understood by the following description of some embodiments thereof, given by way of example only, with reference to the 15 accompanying drawings, in which: Fig. 1 is a schematic illustration of apparatus for partially pre-stretching plastics film according to the invention; 20 Fig. 2 is perspective view of a hand-held film applicator for applying a secondary stretch to the film immediately prior to wrapping an object with the film; 25 Fig. 3 is an elevational view of apparatus for producing pre-stretched film according to the invention; and 30 Fig. 4 is a plan view of the apparatus. Referring to the drawings, a system for producing pre stretched plastic wrapping film will be described. A plastic film 25 is produced in conventional fashion and 35 wound up on a roll 10. The roll 10 is rotatably mounted on a support 11 and film 25 is delivered through film WO99/65775 PCT/IE99/00056 – 5 stretching apparatus 12 to pre-stretch the film 25 by a desired amount prior to winding up the pre-stretched film 25 on a core 14. 5 The film stretching apparatus 12 comprises a set of stretching rollers, in this case comprising three rollers, namely a first roller 15, second roller 16 and third roller 17. Each roller 15,16,17 has an associated idler roller 18 to guide the film about the roller 15, 10 16, 17 in frictional engagement with the roller 15,16,17. The rollers 15,16,17 are driven at different speeds, the third roller 17 having a greater speed than the second roller 16 which in turn has a greater speed than the first roller 15. Thus the first roller 15 applies a 15 stretch of about 100% to the film, the second roller 16 further stretches the film by about 30% and the third roller 17 further stretches the film by about 20%. In this way the plastics film 25 is pre-stretched in three steps prior to winding up on the core 14. 20 The film 25 is loosely wound up on the core 14 to allow for subsequent shrinkage of the film 25. To achieve this a take-off roller 28 downstream of the stretching apparatus 12 rotates at a speed slightly less than the 25 speed of the third stretching roller 17. For wrapping objects with the film 25 a pre-stretched film roll 30 is mounted on a hand-held dispenser 32 the roll 30 being rotatably mounted on a support 33 carried 30 on a handle 34. Also mounted on the handle 34 are a pair of rollers, namely a take-off roller 36 and a final stretch roller 38. The rollers 36,38 are mounted between support brackets 39. At one end of the rollers 36,38 the rollers 36,38 are interconnected by a gear drive 40 which 35 ensures rotation of the final stretch roller 38 at a desired speed greater than the take-off roller 36 to WO99/65775 PCT/IE99/00056 -6 achieve the desired final stretch of the film 25 as it is drawn from the roll 30. In use, an operative grips the handle 34. Having 5 attached a free end of the film 25 to the object to be wrapped the operative walks around the object drawing film 25 off the roll 30 and applying it around the object. As the film 25 is drawn from the roll 30 it is given the final stretch between the take off roller 36 10 and the final stretch roller 38 prior to application to the object to reactivate the memory of the plastic material so that the film will subsequently shrink onto the object securely wrapping and gripping the object. It will be noted that the film 25 is led from the roll 30 15 around the take-off roller 36 which engages against the roll 30 to maintain the line of take-off where the film 25 parts from the roll 30 substantially parallel to the central rotational axis of the roll 30. Thus the film 35 is evenly drawn from the roll 30 without damage due to 20 hang-ups at the edge of the roll 30. It will be appreciated that the system of the invention applies a desired optimum stretch to the film and it can be easily used by even an unskilled operative to wrap an 25 object. It will be appreciated also that while a hand-held dispenser is particularly convenient to use the system may be used with an automatic wrapping device if desired. 30 Referring now to Figs. 4 and 5 there is shown apparatus for producing rolls of partially stretched film according to the invention, the apparatus being indicated generally by the reference numeral 50. The apparatus 50 comprises 35 a conventional extruder 51 and associated die assembly 52 for forming plastics film in a bubble configuration 53 as WO99/65775 PCT/IE99/00056 -7 it is delivered up from the die 52. A conventional collapsing device 54 collapses the bubble 53 which is then delivered through a pair of nip rollers 55 to form the flat film 25 which is then delivered to the 5 stretching apparatus 12. It will be noted that the bubble 53 is collapsed into essentially two overlapping sheets joined at their edges. Also, the temperature of the plastics material at the nip rollers is sufficiently hot to allow blocking or fusing together of said sheets 10 to form a composite fused flat film 25. The film 25 is then delivered through the stretching apparatus 12 in which the film is partially stretched by about 200% overall in three stages as previous described. Downstream of the stretching apparatus 12, the partially 15 stretched film is fed to a core winder 58 in which the partially stretched film is relaxed by about 25% before being wound up on a core as previously described. Two core winders 58 are shown in the drawing. The film 25 may be split longitudinally as shown in Fig. 4 at an 20 outlet of the stretching apparatus 12 to form two narrower films 25 which are then wound up on the separate core winders 58 if desired. It will be appreciated that any other method and 25 apparatus may be employed for forming the flat plastics film which is subsequently delivered to the stepped stretching apparatus 12. The invention is not limited to the embodiments 30 hereinbefore described which may be varied in both construction and detail within the scope of the appended claims.

Claims (18)

1. A wrapping system for stretch-wrap plastic film, comprising: 5 partially pre-stretching a plastics film by a desired amount, relaxing the film, and 10 further stretching the partially pre-stretched film immediately prior to using the pre stretched film for wrapping. 15

2. A wrapping system as claimed in claim 1 wherein after relaxing the film, the film is wound on a core, the further stretching being carried out as the film is drawn from the core for use. 20

3. A wrapping system as claimed in claim 1 or 2 wherein the ratio of the elongations of the film during the pre-stretching step and during the further stretching step is about 3:1. 25

4. A wrapping system as claimed in any preceding claim, wherein the total stretching of the film is between 150% and 250%.

5. A wrapping system as claimed in claim 4, wherein the 30 total stretching of the film is about 200%.

6. A wrapping system as claimed in claim 1, wherein the pre-stretching and relaxing elongates the plastics film by about 140 – 160% and the final stretching of 35 the film immediately prior to application gives between a 10% and 50% elongation of the film. WO 99/65775 PCT/IE99/00056 . -9

7. A wrapping system as claimed in any preceding claim, wherein in the pre-stretching step, the film is stretched by about 200%, said stretched film being 5 subsequently relaxed by about 50%, and in the final stretch the film is stretched by about 50%.

8. A wrapping system as claimed in any preceding claim wherein the pre-stretching of the plastics film is 10 carried out in a number of steps.

9. A wrapping system as claimed in claim 8, wherein the pre-stretching is carried out in three steps giving in step 1 about 100% elongation, in step 2 about 30% 15 elongation and in step 3 about 20% elongation.

10. A wrapping system as claimed in any preceding claim, wherein the film is stretched by feeding the film from a supply roll around two or more spaced-apart 20 film stretching rollers, each roller rotating at a greater speed than the roll or roller immediately upstream to stretch the film between the rollers.

11. A wrapping system as claimed in any preceding claim, 25 wherein the pre-stretched film is loosely wound onto the core.

12. A wrapping system as claimed in claim 11, wherein the film is loosely wound onto the core by feeding 30 film off the final stretching roller at a speed greater than the speed at which the film is wound up on the core.

13. A wrapping system as claimed in any preceding claim 35 which includes the step of leading the film off the core whilst maintaining the line of take-off where WO 99/65775 PCT/IE99/00056 – 10 the film parts from the core substantially parallel to the central rotational axis of the core.

14. A wrapping system as claimed in claim 13, which 5 includes drawing the film from the core around a take-off roller which rotatably engages against an outer surface of the core.

15. A wrapping system as claimed in any preceding claim, 10 wherein the final stretching of the film is carried out by leading the film from the core around a final stretch roller, the speed of the final stretch roller being greater than the speed of discharge of film from the core. 15

16. A wrapping system as claimed in claim 15, wherein the final stretch roller is drivably connected to the take-off roller through a gear drive which ensures rotation of the final roller at a desired 20 speed greater than the take-off roller to achieve the desired final stretch of the film.

17. A wrapping system as claimed in claim 15, wherein the final stretch roller is geared to a rotational 25 support for the core.

18. A roll of partially pre-stretched plastics film whenever produced in accordance with the wrapping 30 system as claimed in any preceding claim. 35

AU43878/99A
1998-06-19
1999-06-21
System for stretch-wrapping

Ceased

AU746189B2
(en)

Applications Claiming Priority (3)

Application Number
Priority Date
Filing Date
Title

IES980494

1998-06-19

IE980494

1998-06-19

PCT/IE1999/000056

WO1999065775A1
(en)

1998-06-19
1999-06-21
System for stretch-wrapping

Publications (2)

Publication Number
Publication Date

AU4387899A
true

AU4387899A
(en)

2000-01-05

AU746189B2

AU746189B2
(en)

2002-04-18

Family
ID=11041826
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU43878/99A
Ceased

AU746189B2
(en)

1998-06-19
1999-06-21
System for stretch-wrapping

Country Status (7)

Country
Link

US
(1)

US6713010B1
(en)

EP
(1)

EP1087891B1
(en)

AT
(1)

ATE227669T1
(en)

AU
(1)

AU746189B2
(en)

CA
(1)

CA2335535A1
(en)

DE
(1)

DE69903949T2
(en)

WO
(1)

WO1999065775A1
(en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

EP1125718B1
(en)

2000-02-09
2004-03-31
Itw Mima Films Llc
Stretch wrap film

FR2909075B1
(en)

2006-11-28
2012-06-29
Patrick Gennesson

FILM OF ETIRAL PLASTIC MATERIAL AND PROCESS FOR MANUFACTURING THE SAME

CA2640944A1
(en)

2007-10-12
2009-04-12
Cousins Packaging Inc.
Carriage for a stretch wrapping machine

US8100356B2
(en)

2008-07-21
2012-01-24
Paragon Films, Inc.
Apparatus and method for winding film onto a film roll

US9676507B2
(en)

2008-07-23
2017-06-13
Best Packaging, Inc.
Stretch wrapping system and process

US20110067364A1
(en)

2009-09-22
2011-03-24
Cousins Neil G
Carriage For A Stretch Wrapping Machine

US20110151217A1
(en)

2009-12-18
2011-06-23
Paragon Films, Inc.
Oriented Film Produced In-Process for Use in the Power Stretch Film Market

CA3093344C
(en)

2012-06-08
2023-03-28
Wulftec International Inc.
Apparatuses for wrapping a load and supplying film for wrapping a load and associated methods

US10377077B2
(en)

2013-03-28
2019-08-13
No.El. S.R.L.
Machine for manufacturing pre-stretched extendable film rolls

US10183773B2
(en)

2014-10-31
2019-01-22
Brenton Llc
Easy thread carriage for stretch film wrapping system

FR3092831B1
(en)

2019-02-14
2021-06-04
Thimon

STRETCHING AND STRETCH FILM DEVICE

CN112537545B
(en)

2020-12-09
2022-08-16
宁波鸿雁包装材料有限公司
Winding film rewinding process and anti-falling stretching winding film

Family Cites Families (5)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

EP0081328A3
(en)

1981-12-07
1984-03-28
Kenneth Stephen Eddin Orpen
Improvements in packaging film dispensers

CA2071422C
(en)

1991-09-06
1996-06-25
Jack N. Shirrell
Method for making prestretched film

FR2695102B1
(en)

1992-08-25
1994-11-04
Newtec Int

Method for overpacking loads using stretch film, machine and film for its implementation.

FR2748734B1
(en)

1996-05-06
1998-07-31
Thimon

OVERPACKING FILM, FILM PRE-STRETCHING DEVICE AND OVERPACKING PROCESS

FR2748722A1
(en)

1996-05-06
1997-11-21
Thimon
Film wrap for wrapping pelletised products

1999

1999-06-21
US
US09/719,963
patent/US6713010B1/en
not_active
Expired – Fee Related

1999-06-21
AU
AU43878/99A
patent/AU746189B2/en
not_active
Ceased

1999-06-21
AT
AT99926715T
patent/ATE227669T1/en
not_active
IP Right Cessation

1999-06-21
DE
DE69903949T
patent/DE69903949T2/en
not_active
Expired – Fee Related

1999-06-21
WO
PCT/IE1999/000056
patent/WO1999065775A1/en
active
IP Right Grant

1999-06-21
CA
CA002335535A
patent/CA2335535A1/en
not_active
Abandoned

1999-06-21
EP
EP99926715A
patent/EP1087891B1/en
not_active
Expired – Lifetime

Also Published As

Publication number
Publication date

DE69903949D1
(en)

2002-12-19

AU746189B2
(en)

2002-04-18

WO1999065775A1
(en)

1999-12-23

EP1087891B1
(en)

2002-11-13

ATE227669T1
(en)

2002-11-15

DE69903949T2
(en)

2003-09-18

US6713010B1
(en)

2004-03-30

CA2335535A1
(en)

1999-12-23

EP1087891A1
(en)

2001-04-04

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