CA2114000A1 - Flexible films for modified atmosphere packaging - Google Patents
Flexible films for modified atmosphere packagingInfo
- Publication number
- CA2114000A1 CA2114000A1 CA 2114000 CA2114000A CA2114000A1 CA 2114000 A1 CA2114000 A1 CA 2114000A1 CA 2114000 CA2114000 CA 2114000 CA 2114000 A CA2114000 A CA 2114000A CA 2114000 A1 CA2114000 A1 CA 2114000A1
- Authority
- CA
- Canada
- Prior art keywords
- glycerolate
- film
- film according
- modified atmosphere
- incorporating
- 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.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/057—Metal alcoholates
-
- 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
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Materials Engineering (AREA)
- Wrappers (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
2114000 9302130 PCTABScor01 A flexible gas-permeable polymeric film useful in the modified atmosphere packaging of fresh produce, incorporates a glycerolate, preferably zinc glycerolate. The film may also incorporate an ethylene active agent such as sodium permanganate.
Description
2ll~ofi~o ~, .'~'.'~
FLEXIBI.E~ FILMS FOR MODIF E~D A~MOSPHER13 PAC~GING
~,'~'' Thi~ in~ention relates to f}exible ~olymeric 4ilm~ u~eful S in the modlfied atmo~here ~ackaging of ~resh ~roduce ~uch as fresh fruit~, vegetable~ and flower~. ~he inve~tion :~:
include~ polymeric film~ in the fo~m of a ~uitable packa~e that can control the atmo~phere surrounding fresh produce in ~uch a way that~the po t-har~est life of the ~roduce is extended. The film~ of the invention contain a glycerolate. ~ -Back~rouna of th~ Inv~ntion .
,.
Deterior~tion of ~roduce a~ter harve~ting invol~e~ many complex factors, among which oxygen, cabon dioxide, water a~d ethylene ha~e;~been identified a~ playing importa~t and~;~
:interrelated roles:in ~he ripening and decomposition rocess. When ~roduce i~ enclo~ed in:pla~tic ~ilm, : .
20: re~piration continue~, con~uming oxygen~and producing carbon dioxide. ~ ~
In general, produce is adver ely affected by low . concentratio~s of oxygen. The relative concentration of oxygen and carbon~dioxide i~ alco impor~ant. The concentra~ion of ~he~e ga~es will vary accordlng to the ~ leati~e permeab~ ty of~the ~olymer film. -: For each ~roduce tXpe there i~ an op~imum range of concentra~ions of CO2 and 2 which retard the re~piratory ~rate aaa impro~e the quality to the greatest extent under ~ra~e condltio~, Althou~h high concentration~ of CO~
ar~ ~ometim~ beneficial ( 8 . g . ~trawberries and ~u~hrooms) low ~ conc~ntration~ have deleteriou~ effect~ on the ' , WO93/02130 PCT/AU92/0038~
d U 2 ~uality of the ~roduce. The relati~e flow of the two ga~e~
throu~h the ilm under storage condition~ and the ty~e o produc~ determine the final com~osition of the atmo~here. :~
~thylene i~ al~o known to advance the onset of an irr~Yersible ri~e in re~iration a~d ri~enin~.
~ ~he action o~ low le~els o~ ga~eou~ ethylene a~ maturation hormone i~ well es~abli~hed. In particular, addition of low level~ (ca l-lO ~pm) of ethyle~e to ~roduce, ~tored under controlled atmo~here co~di~ion~ i~ an e~tabli3hed ~rocess to induce the onset o~ ri~ening. ~The re~er.e : procedure, that of removal o~ ethyle~e from ~tored ~roduce, : ha lso been commo~ly ~rac~iced over man~ year~. Methods or remo~al of ethyle~e hare generally centred around ~: 15 ~orubbing processe~, in which the ga~ was xeactively ~;~
: ~crubbed~out o4~a:~re~irculating atmo3~here, for ex ~ le by bubbling through ~ota~sium permanganate solution.
Howevér; it~will be a~preclated that the concentration of ethylene within a~ackage may al30 :be effecti~ely reduc~d -~
0 :~: ~by u~ing a ~ckaging-material o~:a~pro~riate permeability.
A~ the~concentration~o~ ethylene i~ the atmosphere out~ide the package~i~ practically nil, diffusion of ethylene through the packaging~material will esBentially be a one-way: proc~ hat:permanently removes ethylene from the atmo~here with~n the package.
~ :
On thie ~ther ~anid, ~if~u~ion oflcarbon dioxide andioxygen hxou~h packagi~g film~ i~ a complex two-way ~roce~ that :~
s only imper~ec~ly unde ietood.
, j: :
-~
!~ 93/0~}30 2 11 ~ O ~ 3 PCT/AU92/00383 ~:
PRIOR RR~AT~D _PPLICATION ~:~
In our earlier Au~t~alian ~ate~t a~plication 81642/91, the e~t~re di~clo~ure i~ which i~ by this reference incorporat~d in~o the ~re3ent ~ecification, we have de~crihed and claimed a ~lexible ga3-~ermeable ~olymeric -~
~ilm u~e~ul in the modified atmo~ph0re ~a~kaging o~ ~resh ;-~roduce, c~aracterl~ed in that the film incor~orate~ a~
ethylene reacti~e agent, a ~referred agent being ~odium ~ermanganate.
S~MMARY OF HF I~V~o~l~Y ~.
We have ~ow found that the relati~e flow of carbon dioxide 15 and o~ygen through ~ackagi~g film~ can~be affected in a ~-mann~ be~eficial to the ~torage life o~ ~re~h ~roduce packaged therein b~ the incorporation of cert~in materials ~-into the ~id film~. The materials are con~eniently added to the initial polymer before extrusion.
~: 20 In accordan~e with the in~2ntion, the additives used are o~e or ~ore me~al glycerolate , preferably zinc : ~lycerolate~ T~e ~ilm may be any ~uitable flexible ~olyme~ic ~ilm, ~or exam~le polyethylene, ~olypro~ylene, :~ 25 ~oly~inyl chloride and other well-Xnown film~ suitable for ~ackaging~ and preferably contain ~iller~, for example ~ilica, alumina,~ magne~ium oxide and/or,~umice.
;~ , ' The glycerolate may be preRent in the film in an amount ~xom 0.025 to 0.4% by weight. In a pre~erred embodiment of , ~ ~he inve~ion, the glycerolate i~ incor~orated into filmg which al~o contain one or more of the agent~ di~clo~ed in ¦ our abo~e mentioned Au~tralian a~plication 81642/91.
:
, .
~, WO93/02130 211 4 0 ~ D 4 PCT/A~92/00~
Although we do not wi~h to be limited by a~y ~ypothetical or ~os~ulated mechani~m for the ob~Prved be~e~icial effect~, it i~ belie~ed that the metal glycerolate in co~bina~i~n with ~he ~illing material~ ha~ an ef~ect o~ .~ :~
~oiding and ~oxe formatio~ of the micro~orous polymer film. ;~
xamp~~1 A masterba~ch was pre~ared with low density ~olyethylene in 10 which ~umice and zinc glycerolate were added so that the :
loadin~ were 20% a~d 1% res~ectively. Before extrusion the maRtexbatch wa~ then combined with linear low den~ity ~olyethylene o that ~he final com~o~ition of the~ blown film~ao~tained about 4% pumice and .2% zinc ~lycerolate.
~.
~xample~ 2 and 3 In a similar manner to ~xam~le l,~ilm~ were ~re~ared ~-containin~
FLEXIBI.E~ FILMS FOR MODIF E~D A~MOSPHER13 PAC~GING
~,'~'' Thi~ in~ention relates to f}exible ~olymeric 4ilm~ u~eful S in the modlfied atmo~here ~ackaging of ~resh ~roduce ~uch as fresh fruit~, vegetable~ and flower~. ~he inve~tion :~:
include~ polymeric film~ in the fo~m of a ~uitable packa~e that can control the atmo~phere surrounding fresh produce in ~uch a way that~the po t-har~est life of the ~roduce is extended. The film~ of the invention contain a glycerolate. ~ -Back~rouna of th~ Inv~ntion .
,.
Deterior~tion of ~roduce a~ter harve~ting invol~e~ many complex factors, among which oxygen, cabon dioxide, water a~d ethylene ha~e;~been identified a~ playing importa~t and~;~
:interrelated roles:in ~he ripening and decomposition rocess. When ~roduce i~ enclo~ed in:pla~tic ~ilm, : .
20: re~piration continue~, con~uming oxygen~and producing carbon dioxide. ~ ~
In general, produce is adver ely affected by low . concentratio~s of oxygen. The relative concentration of oxygen and carbon~dioxide i~ alco impor~ant. The concentra~ion of ~he~e ga~es will vary accordlng to the ~ leati~e permeab~ ty of~the ~olymer film. -: For each ~roduce tXpe there i~ an op~imum range of concentra~ions of CO2 and 2 which retard the re~piratory ~rate aaa impro~e the quality to the greatest extent under ~ra~e condltio~, Althou~h high concentration~ of CO~
ar~ ~ometim~ beneficial ( 8 . g . ~trawberries and ~u~hrooms) low ~ conc~ntration~ have deleteriou~ effect~ on the ' , WO93/02130 PCT/AU92/0038~
d U 2 ~uality of the ~roduce. The relati~e flow of the two ga~e~
throu~h the ilm under storage condition~ and the ty~e o produc~ determine the final com~osition of the atmo~here. :~
~thylene i~ al~o known to advance the onset of an irr~Yersible ri~e in re~iration a~d ri~enin~.
~ ~he action o~ low le~els o~ ga~eou~ ethylene a~ maturation hormone i~ well es~abli~hed. In particular, addition of low level~ (ca l-lO ~pm) of ethyle~e to ~roduce, ~tored under controlled atmo~here co~di~ion~ i~ an e~tabli3hed ~rocess to induce the onset o~ ri~ening. ~The re~er.e : procedure, that of removal o~ ethyle~e from ~tored ~roduce, : ha lso been commo~ly ~rac~iced over man~ year~. Methods or remo~al of ethyle~e hare generally centred around ~: 15 ~orubbing processe~, in which the ga~ was xeactively ~;~
: ~crubbed~out o4~a:~re~irculating atmo3~here, for ex ~ le by bubbling through ~ota~sium permanganate solution.
Howevér; it~will be a~preclated that the concentration of ethylene within a~ackage may al30 :be effecti~ely reduc~d -~
0 :~: ~by u~ing a ~ckaging-material o~:a~pro~riate permeability.
A~ the~concentration~o~ ethylene i~ the atmosphere out~ide the package~i~ practically nil, diffusion of ethylene through the packaging~material will esBentially be a one-way: proc~ hat:permanently removes ethylene from the atmo~here with~n the package.
~ :
On thie ~ther ~anid, ~if~u~ion oflcarbon dioxide andioxygen hxou~h packagi~g film~ i~ a complex two-way ~roce~ that :~
s only imper~ec~ly unde ietood.
, j: :
-~
!~ 93/0~}30 2 11 ~ O ~ 3 PCT/AU92/00383 ~:
PRIOR RR~AT~D _PPLICATION ~:~
In our earlier Au~t~alian ~ate~t a~plication 81642/91, the e~t~re di~clo~ure i~ which i~ by this reference incorporat~d in~o the ~re3ent ~ecification, we have de~crihed and claimed a ~lexible ga3-~ermeable ~olymeric -~
~ilm u~e~ul in the modified atmo~ph0re ~a~kaging o~ ~resh ;-~roduce, c~aracterl~ed in that the film incor~orate~ a~
ethylene reacti~e agent, a ~referred agent being ~odium ~ermanganate.
S~MMARY OF HF I~V~o~l~Y ~.
We have ~ow found that the relati~e flow of carbon dioxide 15 and o~ygen through ~ackagi~g film~ can~be affected in a ~-mann~ be~eficial to the ~torage life o~ ~re~h ~roduce packaged therein b~ the incorporation of cert~in materials ~-into the ~id film~. The materials are con~eniently added to the initial polymer before extrusion.
~: 20 In accordan~e with the in~2ntion, the additives used are o~e or ~ore me~al glycerolate , preferably zinc : ~lycerolate~ T~e ~ilm may be any ~uitable flexible ~olyme~ic ~ilm, ~or exam~le polyethylene, ~olypro~ylene, :~ 25 ~oly~inyl chloride and other well-Xnown film~ suitable for ~ackaging~ and preferably contain ~iller~, for example ~ilica, alumina,~ magne~ium oxide and/or,~umice.
;~ , ' The glycerolate may be preRent in the film in an amount ~xom 0.025 to 0.4% by weight. In a pre~erred embodiment of , ~ ~he inve~ion, the glycerolate i~ incor~orated into filmg which al~o contain one or more of the agent~ di~clo~ed in ¦ our abo~e mentioned Au~tralian a~plication 81642/91.
:
, .
~, WO93/02130 211 4 0 ~ D 4 PCT/A~92/00~
Although we do not wi~h to be limited by a~y ~ypothetical or ~os~ulated mechani~m for the ob~Prved be~e~icial effect~, it i~ belie~ed that the metal glycerolate in co~bina~i~n with ~he ~illing material~ ha~ an ef~ect o~ .~ :~
~oiding and ~oxe formatio~ of the micro~orous polymer film. ;~
xamp~~1 A masterba~ch was pre~ared with low density ~olyethylene in 10 which ~umice and zinc glycerolate were added so that the :
loadin~ were 20% a~d 1% res~ectively. Before extrusion the maRtexbatch wa~ then combined with linear low den~ity ~olyethylene o that ~he final com~o~ition of the~ blown film~ao~tained about 4% pumice and .2% zinc ~lycerolate.
~.
~xample~ 2 and 3 In a similar manner to ~xam~le l,~ilm~ were ~re~ared ~-containin~
2~
. - Example 2 Example_3 Polyeth~lene ~ 99% 99%
Finely ~round ~ilica 0.025% : ~ 0.025%
: Sodium perma~:ganate 0.02% 0.04%
25~ Zinc glycerolate 0.05% ` 0.05% .. :
Exam~
,i:
In a ~imilar ma~ner to ~xam~le l, a film wa~ pre~ared :30 co~taininy O.Z% ~odium permanganate, 0.1% glycerolate and .:
2~o ~umlce.
, . ,.
, . ;.
,"
A ~
~"
2 ~ J 3 ~ PCl'/AU92/003B3 ,~0 93/02130 PROD~C}3 TRIAl S
Txials with fre~h produce have ~hown that the film~ of the in~ention arld par~icularly thoae de~cribed in the ~oregoing 5 exampl~3 are ~atis:~ac~co:cy f or the storage of broccs1i and other ~roduce wi~h imllar respiratory rate~. In partiGular, ~re~hne~3 o~ broccoli and callliflower wral?~ed i~ the~e f iIm~3 wa3 main~ained under ~torage condition~ of about 4C for periods :of u~? to 50 day~
' ' ;-, ~ . :
,:
: .
,,'~ ' ~
.
, , . . .
.. . . .
. - Example 2 Example_3 Polyeth~lene ~ 99% 99%
Finely ~round ~ilica 0.025% : ~ 0.025%
: Sodium perma~:ganate 0.02% 0.04%
25~ Zinc glycerolate 0.05% ` 0.05% .. :
Exam~
,i:
In a ~imilar ma~ner to ~xam~le l, a film wa~ pre~ared :30 co~taininy O.Z% ~odium permanganate, 0.1% glycerolate and .:
2~o ~umlce.
, . ,.
, . ;.
,"
A ~
~"
2 ~ J 3 ~ PCl'/AU92/003B3 ,~0 93/02130 PROD~C}3 TRIAl S
Txials with fre~h produce have ~hown that the film~ of the in~ention arld par~icularly thoae de~cribed in the ~oregoing 5 exampl~3 are ~atis:~ac~co:cy f or the storage of broccs1i and other ~roduce wi~h imllar respiratory rate~. In partiGular, ~re~hne~3 o~ broccoli and callliflower wral?~ed i~ the~e f iIm~3 wa3 main~ained under ~torage condition~ of about 4C for periods :of u~? to 50 day~
' ' ;-, ~ . :
,:
: .
,,'~ ' ~
.
, , . . .
.. . . .
Claims (8)
1. A flexible gas-permeable polymeric film useful in the modified atmosphere packaging of fresh produce, characterised in that the film incorporates a glycerolate.
2. A film according to claim 1 in which the glycerolate is a metal glycerolate.
3. A film according to claim 1 in which the glycerolate is zinc glycerolate.
4. A film according to claim 1, also incorporating a permanganate salt.
5. A film according to claim 1, which is a polyethylene film incorporating zinc glycerolate and sodium permanganate.
6. A film according to any one of claims 1 to 5, also incorporating a filler such as silica, alumina, magnesium oxide and/or pumice.
7. A film according to claim 1, which is a polyethylene film incorporating about 0.2%wt zinc glycerolate and about 4%wt pumice.
8. A film according to claim 1, substantially as hereinbefore described in the Examples.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPK7389 | 1991-07-24 | ||
| AUPK738991 | 1991-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2114000A1 true CA2114000A1 (en) | 1993-02-04 |
Family
ID=3775572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2114000 Abandoned CA2114000A1 (en) | 1991-07-24 | 1992-07-24 | Flexible films for modified atmosphere packaging |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2114000A1 (en) |
| NZ (1) | NZ243716A (en) |
| WO (1) | WO1993002130A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995008524A1 (en) * | 1993-09-23 | 1995-03-30 | Pharmaserve Limited | Zinc glycerolate manufacture |
| US6190710B1 (en) | 1996-02-20 | 2001-02-20 | Stepac L.A., The Sterilizing Packaging Company Of L.A., Ltd. | Plastic packaging material |
| EP0888237A4 (en) | 1996-02-20 | 1999-05-06 | Ben Tzur Israel | Plastic packaging material |
| DE19957439A1 (en) * | 1999-11-29 | 2001-06-13 | Ticona Gmbh | Absorption of formaldehyde in closed, gas impermeable containers |
| US6812314B2 (en) | 2001-10-17 | 2004-11-02 | University Of Florida | Thermally responsive polymer materials and uses thereof |
| US20060070523A1 (en) * | 2004-10-04 | 2006-04-06 | Sud-Chemie, Inc. | Sodium permanganate ethylene absorption agent |
| CN103819799B (en) * | 2014-03-07 | 2016-02-24 | 福州大学 | Polymer/potassium permanganate composite film and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3038471A1 (en) * | 1980-10-11 | 1982-06-03 | Hoechst Ag, 6000 Frankfurt | SYNTHETIC RESIN COMPOSITION, METHOD FOR THEIR PRODUCTION, ITS APPLICATION AND FILM PRODUCED FROM THE COMPOSITION |
| AU584238B2 (en) * | 1985-08-27 | 1989-05-18 | Glyzinc Pharmaceuticals Limited | Plastics or rubber materials modified by crystalline glycerato-zinc complex |
-
1992
- 1992-07-24 WO PCT/AU1992/000383 patent/WO1993002130A1/en active Application Filing
- 1992-07-24 CA CA 2114000 patent/CA2114000A1/en not_active Abandoned
- 1992-07-24 NZ NZ24371692A patent/NZ243716A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1993002130A1 (en) | 1993-02-04 |
| NZ243716A (en) | 1994-01-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |