NZ782943A - Thin film for waste packing cassettes - Google Patents
Thin film for waste packing cassettesInfo
- Publication number
- NZ782943A NZ782943A NZ782943A NZ78294321A NZ782943A NZ 782943 A NZ782943 A NZ 782943A NZ 782943 A NZ782943 A NZ 782943A NZ 78294321 A NZ78294321 A NZ 78294321A NZ 782943 A NZ782943 A NZ 782943A
- Authority
- NZ
- New Zealand
- Prior art keywords
- less
- film
- weight
- outer layer
- layer
- Prior art date
Links
- 239000002699 waste material Substances 0.000 title abstract description 8
- 239000010409 thin film Substances 0.000 title description 2
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 30
- 239000005977 Ethylene Substances 0.000 claims description 26
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 26
- 229920001577 copolymer Polymers 0.000 claims description 21
- 239000004711 α-olefin Substances 0.000 claims description 19
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 17
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 16
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims description 16
- 239000004952 Polyamide Substances 0.000 claims description 14
- 229920002647 polyamide Polymers 0.000 claims description 14
- 239000011528 polyamide (building material) Substances 0.000 claims description 13
- -1 polypropylene Polymers 0.000 claims description 10
- 229920002292 Nylon 6 Polymers 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 230000000875 corresponding Effects 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 125000004836 hexamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 claims 1
- 239000010408 film Substances 0.000 description 92
- 239000000543 intermediate Substances 0.000 description 31
- 229920000642 polymer Polymers 0.000 description 17
- 229920001684 low density polyethylene Polymers 0.000 description 13
- 239000004702 low-density polyethylene Substances 0.000 description 13
- 239000000654 additive Substances 0.000 description 9
- 230000000844 anti-bacterial Effects 0.000 description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 7
- 239000004594 Masterbatch (MB) Substances 0.000 description 6
- 101700080270 ADH2 Proteins 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 5
- 229920002302 Nylon 6,6 Polymers 0.000 description 4
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 4
- 230000000996 additive Effects 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 229920001519 homopolymer Polymers 0.000 description 4
- 239000005033 polyvinylidene chloride Substances 0.000 description 4
- 101700007462 ADH1A Proteins 0.000 description 3
- 102100000356 ADH1A Human genes 0.000 description 3
- 239000004698 Polyethylene (PE) Substances 0.000 description 3
- 101710044706 SFA1 Proteins 0.000 description 3
- 101710025952 adhT Proteins 0.000 description 3
- 230000000845 anti-microbial Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- FQVLRGLGWNWPSS-BXBUPLCLSA-N (4R,7S,10S,13S,16R)-16-acetamido-13-(1H-imidazol-5-ylmethyl)-10-methyl-6,9,12,15-tetraoxo-7-propan-2-yl-1,2-dithia-5,8,11,14-tetrazacycloheptadecane-4-carboxamide Chemical compound N1C(=O)[C@@H](NC(C)=O)CSSC[C@@H](C(N)=O)NC(=O)[C@H](C(C)C)NC(=O)[C@H](C)NC(=O)[C@@H]1CC1=CN=CN1 FQVLRGLGWNWPSS-BXBUPLCLSA-N 0.000 description 2
- 229960003563 Calcium Carbonate Drugs 0.000 description 2
- 241000191967 Staphylococcus aureus Species 0.000 description 2
- 229940076185 Staphylococcus aureus Drugs 0.000 description 2
- 239000004708 Very-low-density polyethylene Substances 0.000 description 2
- 150000001408 amides Chemical group 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical group CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920000554 ionomer Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 235000019645 odor Nutrition 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 2
- 230000035943 smell Effects 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 2
- 229920001866 very low density polyethylene Polymers 0.000 description 2
- LGXVIGDEPROXKC-UHFFFAOYSA-N 1,1-Dichloroethene Chemical compound ClC(Cl)=C LGXVIGDEPROXKC-UHFFFAOYSA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-Hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- JTXMVXSTHSMVQF-UHFFFAOYSA-N 2-acetyloxyethyl acetate Chemical compound CC(=O)OCCOC(C)=O JTXMVXSTHSMVQF-UHFFFAOYSA-N 0.000 description 1
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L Calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- ORAWFNKFUWGRJG-UHFFFAOYSA-N Docosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCC(N)=O ORAWFNKFUWGRJG-UHFFFAOYSA-N 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N Ethylene glycol dimethacrylate Chemical compound CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 241001643597 Evas Species 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 241000282619 Hylobates lar Species 0.000 description 1
- 210000000088 Lip Anatomy 0.000 description 1
- VMRGZRVLZQSNHC-UHFFFAOYSA-N N-octadec-9-enylhexadecanamide Chemical compound CCCCCCCCCCCCCCCC(=O)NCCCCCCCCC=CCCCCCCCC VMRGZRVLZQSNHC-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920000572 Nylon 6/12 Polymers 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N Oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 229920000034 Plastomer Polymers 0.000 description 1
- 229920001083 Polybutene Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229940037312 STEARAMIDE Drugs 0.000 description 1
- 229920003182 Surlyn® Polymers 0.000 description 1
- 241001459538 Ute Species 0.000 description 1
- 229920001567 Vinyl ester Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000005250 alkyl acrylate group Chemical group 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 244000052616 bacterial pathogens Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000001010 compromised Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000005712 crystallization Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000008079 hexane Substances 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N hexane Substances CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010807 litter Substances 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 150000002734 metacrylic acid derivatives Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920002225 poly(styrene-co-butadiene) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920005638 polyethylene monopolymer Polymers 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 230000001737 promoting Effects 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical group [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Abstract
The present invention relates to a multilayer film for use in malodorous item packaging, a cassette comprising such a multilayer film and the use of the multilayer film for waste packing.
Description
THIN FILM FOR WASTE PACKING CASSETTES
This application is a Convention application which claims priority from EU ation
number 27.6, filed on 1 December 2020 the content of which is incorporated herein by
reference.
The present ion relates to a multilayer film for use in malodorous item ing.
A lot of waste products produce smells that are annoying to the environment. Example are
decayed food, kid s and cat litter.
In the prior art there are many films that could be used for protection from malodors. As well
known in the art, the use of materials like EVOH, PVDC, polyacrylonitrile is recommended in
order to not allow malodors escape from the container (e.g. bag or another configuration) and
create an unpleasant atmosphere.
There are also a lot of known configurations of packing a certain length of film (e.g. 20
meters) in a compressed form (e.g. in a te). Examples of the representative cassettes are
shown in US 4,934,529 or US 192.
Generally, the cassette comprises a tubular core, casing wall and cassette bottom. The film is
pulled through the area between the lid of the cassette and the casing wall. The flexible tubing
is dispensed from the cassette. After the rous item is thrown into the bag the core is
rotated and the flexible tube is twisted so that it closes as hermetically as possible the
waste/environment area.
To dispose the next diaper, the user pulls the next portion of film. The previous hermetically
closed diaper is pulled downwards and the new diaper is packed in a new configuration. All
these different packs are stored in a bin which is periodically emptied.
Separation of one pack to the other can be done by various means. A rotary knife is preferred.
FILM CHARACTERISTICS
In the prior art a lot of possible film configurations either monolayer or multilayer have been
proposed. The basic characteristics a film should have in order to be used in the particular case
1. r to odors
2. To have sufficient ical properties (e.g. tensile strength at break, elongation).
With new environmental rules promoting the t of “less plastic”, it is critical to produce
films with lower thickness. At the same time, it is imperative that these films keep ent
barrier and mechanical properties.
Patent application EP 2 085 216 gives an example of production of successful films for this
application. However, it is challenging to produce films with lower weight than 14 g/m2 as the
bubble stability of the hot blown film is compromised. Further, the use of ntial non
ent material increases the possibility to have sed die lip deposits (die drool).
Further, the use of such materials may not allow the coefficient of friction to go to as low as
0.2 (kinetic cient of friction, film to film, ASTMD 1894) which is often desired in such
applications.
For example, films according to EP 2 085 216 have kinetic coefficient of friction (film to film
and measured as per ASTM D1894) of more than 0.30 which creates serious issues during
filling of the cassettes or in the use of the film or cassette by the consumer.
Patent application EP 2 332 723 is also suitable for production of films as per the application.
However, the use of polypropylene, because of its inherent stiffness and crystallization
properties, occasionally generates wrinkle problems during production and is not so friendly to
production conditions. The applicant has found out that in big extrusion “campaigns”, the high
percentage of bubble breakages of films according to EP 2 332 723 is a common issue.
We have surprisingly found that all the es required for such application can be achieved
with a very lightweight multilayer film with a weight of less than 20 g/m2. This is ext remely
beneficial for the environment as multilayer films are extremely difficult to be ed with
so small weight per surface.
SUMMARY OF THE INVENTION
In a first aspect the invention is directed to a multilayer film with weight less than 20g/m2 for
use in malodorous item packaging, wherein the film comprises two outer layers comprising
ethylene alpha olefin copolymer.
Preferably, at least one or both of the outer layers comprise more than 50% per weight
ne alpha olefin copolymer.
The ayer preferably further comprises a barrier layer, preferably the r layer
comprises EVOH or polyamide as a barrier material.
The multilayer film ably does not contain polypropylene.
The total amount of substantially non-resilient material in the multiplayer film is preferably
% per weight or less, more preferably 7% per weight or less, even more preferably 5% per
weight or less, in ular 3% per weight or less, based on the total weight of the multilayer
film. Most preferably the multilayer-film does not contain any substantially non-resilient
material
The total amount of substantially non-resilient material in each outer layer is preferably 10%
per weight or less, more preferably 7% per weight or less, even more preferably 5% per
weight or less, in ular 3% per weight or less, based on the total weight of the
corresponding outer layer. Most preferably each outer layer does not contain any substantially
non-resilient material.
According to a preferred the multilayer film has a weight less than 18 g/m2, preferably less
than 17 g/m2, more preferably less than 16 g/m2, even more ably less than 15 g/m2, most
preferably less than 14 g/m2, and in particular less than 13 g/m2.
Preferably, the weight of each outer layer in the multilayer film is less than 8 g/m2, more
preferable less than 6 g/m2, most preferably less than 5 g/m2.
The ethylene alpha olefin copolymer sed in the two outer layers is preferably hexene or
octene copolymer.
In a preferred embodiment the multilayer film further comprises at least one ediate layer
comprising polyamide, preferably the polyamide is polyamide 6 or polyamide 6/66.
In a preferred ment of the multilayer film at least one or both of the outer layer
comprise a slip agent, preferably, the slip agent is an amide-based slip agent.
In the multilayer film of the present invention both outer layers have a c o-film
coefficient of on of less than 0.35 measured according to ASTMD1894, preferably the
coefficient of friction is less than 0.30, more ably the coefficient of on is less than
0.25, even more preferably less than 0.2.
In a preferred embodiment the multilayer film comprises, preferably consists of the following
layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / BARRIER LAYER / INTERMEDIATE
LAYER 3 / OUTER LAYER
Wherein INTERMEDIATE LAYER 1 and 3 can comprise the same or different materials.
In a further preferred embodiment, the multilayer film comprises, preferably consists of the
following layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / INTERMEDIATE LAYER 2 / BARRIER
LAYER / INTERMEDIATE LAYER 3 / INTERMEDIATE LAYER 4 / OUTER LAYER
Wherein each of INTERMEDIATE LAYER 1-4 can comprise the same or different materials.
In a preferred embodiment the multilayer film presents an antibacterial activity characterized
by a decline of at least 20% of the population of Staphylococcus aureus held in contact with at
least one of the outer layers of the film for 24 hours compared to the initial population,
measured according to ISO 2196/2011 for measurement of the antibacterial ty on plastics
and other non-porous surfaces.
According to a second aspect a cassette is provided comprising a multilayer film according to
the present invention.
A third aspect of the invention related to the use of a ayer film ing to the present
invention for waste packing.
Preferably, the film is stored in a te.
In a preferred ment the film is folded or the film is in the form of a bag.
Definitions:
In this application the following definitions are used:
The term “film” refers to a flat or tubular flexible structure of thermoplastic material.
The term “heat shrinkable” refers to a film that shrinks at least 10% in at least one of the
longitudinal and transverse ions when heated at 90°C for 4 seconds. The shrinkability is
measured in water according to ASTM 2732. For temperatures like 100°C or more, glycerine
is used as a reference liquid.
The term “total heat shrinkability” refers to the sum of heat shrinkability at the MD direction
and heat shrinkability at the TD direction. In all cases, ASTM 2732 is used for measurement
of shrinkabilities.
The term “multilayer” refers to a film comprising 2 or more layers.
The phrase “longitudinal direction” or “machine direction” herein abbreviated “MD” refers to
a direction along the length of the film.
The phrase “outer layer” refers to the film layer which comes in immediate contact with the
e environment. Therefore, the film has two outer layers, and when formed to a pack one
of outer layers is inside of the pack and one at the outside of the pack.
The phrase “inner layer” refers to any film layer that is not “outer layer».
As used herein, the term “homopolymer” refers to a polymer resulting from polymerization of
a single monomer.
As used herein, the term “copolymer” refers to a polymer resulting from polymerization of at
least two different polymers.
As used herein, the term “polymer” includes both above types.
As used herein, the term “polyolefin” refers to any polymerized olefin, which can be linear,
branched, cyclic, aliphatic, substituted or unsubstituted. More specifically, included in the
term polyolefin are lymers of olefin, copolymers of olefin, copolymers of an olefin
and a non ic mer (such as ester) etc.
Specific es include polyethylene homopolymer, polypropylene homopolymer,
polybutene homopolymer, ethylene alpha olefin copolymer, propylene alpha olefin copolymer,
butene alpha olefin copolymer, ionomer, ethylene ester copolymer etc.
As used herein the term “polyethylene” identifies rs consisting essentially of the
ethylene repeating unit. The ones that have a density more than 0.940 are called high density
polyethylene (HDPE), the ones that are have less than 0.940 are low y polyethylene
(LDPE).
As used herein the phrase ene alpha olefin copolymer” refers to ethylene-based
mers like linear low-density polyethylene (LLDPE), medium density polyethylene
(MDPE), very low-density polyethylene (VLDPE), ultra-low-density polyethylene (ULDPE),
metallocene catalyzed polymers and polyethylene plastomers and elastomers.
As used herein the term “homogeneous ethylene alpha olefin copolymers” refer to ethylene
alpha olefin copolymers having a lar weight distribution less than 2.7 as measured by
GPC. Typical examples of these polymers are AFFINITY from DOW or Exact from Exxon.
As used herein the phrase “styrene polymers” refers to styrene homopolymer such as
polystyrene and to styrene copolymers such as styrene-butadiene copolymers, styrenebutadiene-styrene
copolymers, e-isoprene-styrene mers, e-ethylenebutadiene-styrene
copolymers, ethylene-styrene copolymers and the like.
As used herein the phrase “ethylene methacrylate copolymers” refers to copolymers of
ethylene and methacrylate monomer. The monomer content is less than 40%.
As used herein the phrase “ethylene vinyl acetate copolymer” or EVA refer to copolymers of
ethylene and vinyl acetate.
As used herein the phrase “ethylene ester mer” includes any polymer made from
ethylene and ester monomers. It is s that this term includes EVAs, EMAs and other
As used herein the term “barrier polymer” refers to polymers which have the property to limit
the passage of oxygen through a film or a layer comprising the polymer. Common materials,
are EVOH, PVDC or polyamide.
As used herein, the term EVOH refers to saponified products of ethylene vinyl ester
copolymers. The ethylene content is typically in the range of 25 to 50% per mol. All the later
references to EVOH ethylene content will be in % per mol.
As used herein the term PVDC refers to a vinylidene chloride copolymer wherein a major
amount of the mer comprises vinylidene chloride and a minor amount of the copolymer
comprises one or more monomers such as vinyl chloride and/or alkyl acrylates and
methacrylates.
[Link]
http://www.webstore.ansi.org/
As used herein the term “polyamide” refers to homopolymers and copolymers. Polyamide 6,
polyamide 66, polyamide 12, polyamide 6/66, polyamide 6/12, ide elastomers, MXD
polyamides and other copolymers are ically useful for the invention.
As used herein the term “polyester” refers to polymers comprising terephthalate units.
Examples of polyesters are PET (polyethylene terephthalate), PBT (polybutylene
terephthalate), polyester elastomer (block copolymer comprising ester or ether units), PTT and
other similar polymers.
As used herein, the term “ionomer” comprises the copolymers of ethylene and methacrylic or
acrylic acid being metal neutralized. An example of such material is Surlyn from Dupont.
As used herein, the term “polypropylene” refers to polymers incorporating propylene
structural units in a weight percentage of more than 50% per weight of the total polymer.
Examples of these, are homo polypropylenes, random copolymers of propylene and ethylene,
block copolymers of propylene and ne, copolymers or blends of propylene and rubber
(such as blends of polypropylene and ethylene propylene ), propylene ethylene alpha
olefin terpolymers and others.
These polymers may be isotactic, tactic or atactic. Isotactic is preferred.
As used herein the term “substantially non resilient material” refers to materials or material
compounds comprising nics like calcium carbonate, titanium dioxide, wollastonite,
mica, glass fibers, dolomite, silica and the like.
All measurement methods mentioned herein are readily available for the skilled person. For
example, they can be obtained from the American National rds ute at:
bstore.ansi.org
All tages are based on weight per weight ratio, except when otherwise stated.
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect the present invention is directed to a multilayer film with weight
less than 20g/m2 for use in malodorous item packaging, where the film comprises two outer
layers comprising ethylene alpha olefin copolymers.
In a preferred embodiment the multilayer film comprises, preferably consists of the following
layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / INTERMEDIATE LAYER 2 / BARRIER
LAYER / INTERMEDIATE LAYER 3 / INTERMEDIATE LAYER 4 / OUTER LAYER
Wherein each of INTERMEDIATE LAYER 1-4 can comprise the same or different materials.
In a preferred embodiment the multilayer film comprises, ably consists of the following
layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / BARRIER LAYER / INTERMEDIATE
LAYER 3 / OUTER LAYER
Wherein INTERMEDIATE LAYER 1 and 3 can comprise the same or ent materials.
Detailed description of layers
Barrier layer
Preferably, the multilayer film comprises a r layer.
In one ment the barrier layer comprises EVOH as a barrier material.
The EVOH used preferably has an ethylene content less than 48%, more preferably less than
44%, more preferably less than 38%, more preferably from 27 to 32% ethylene.
In another embodiment the barrier layer ses ide as a barrier material.
The oxygen barrier material preferably has a weight of less than 3 g/m2, more preferably less
than 2 g/m2 and even more preferably less than 1.5 g/m2.
Outer layers
The outer layer ses ethylene alpha olefin copolymer. In a preferred version, the outer
layer comprises one or more ethylene alpha olefin copolymers in more than 50% weight
fraction based on the total weight of the outer layer. The outer layer can r comprise in
addition to the ethylene alpha olefin copolymer a low-density polyethylene, styrene polymers
and/or additives. Low density polyethylene (LDPE) is red.
In a preferred embodiment, the multilayer film comprises in at least one of the outer , in
addition to the ethylene alpha olefin mer, 0.5-40%, preferably 5-30% per weight of
low-density polyethylene (LDPE) based on the total weight of the corresponding outer layer.
In a further preferred embodiment, the multilayer film comprises in both outer layers, in
addition to the ethylene alpha olefin copolymer, 0.5-40%, preferably 5-30% per weight of
low-density polyethylene (LDPE) based on the total weight of the corresponding outer layer.
In a further preferred version, the weight of each outer layer is less than 8 g/m2, preferable less
than 6 g/m2, more preferably less than 5 g/m2.
In a further preferred version, the two outer layers comprise a slip agent cant). Slip
agents are preferable of the amide family, such as erucamide, oleamide, oleyl-palmitamide,
stearamide, behenamide and the like. Alternatively, the slip may also comprise siloxane
In a further preferred version of the invention the kinetic coefficient of friction of each of the
two outer layers measured upon itself (as per 894) is less than 0.35, more preferably
less than 0.3, even more preferably less than 0.25, most preferably less than 0.2.
Intermediate layers
In a preferred embodiment, the multilayer film comprises at least one intermediate layer. The
multilayer film can comprise several intermediates layers. Preferably the intermedial layer(s)
is (are) located between the barrier layer and one of the outer layers. There can be more than
one intermediate layer be located between the barrier layer and one of the outer layers.
In the intermediate layers, typical adhesive resins like maleic anhydrite modified efins
may be used. Typical examples are BYNEL from Dupont and OREVAC from Arkema.
In another preferred version of the invention, an ediate layer comprises a polyamide.
For example, a preferred version of the invention is
Outer layer / Intermediate layer 1 / Intermediate layer 2 / EVOH / polyamide / Intermediate
layer 3 / Outer layer
Outer layer / Intermediate layer 1 / Polyamide / EVOH / Polyamide / Intermediate layer 3 /
Outer layer
In another version of the invention, at least one intermediate layer comprises polyamide.
If a multilayer film of the present invention ses ide in an intermediate layer,
then preferably polyamide 6 or polyamide 6/66 is used.
General
Additives well known in the art may be used in one or more layers of the present invention.
Slip additives, antifog additives, polymer processing aids may be used if pertinent.
Antimicrobial and/or antibacterial additives may also be used in one or more of the layers to
inhibit the microbe formation. Preferably the crobial or antibacterial additive is added to
at least one, or both outer layers. Preferably the antimicrobial or antibacterial additive is added
to the outer layer in direct contact to the product to be packed.
The antimicrobial/antibacterial additive ably comprises , silver ion and/or copper.
More preferably it comprises silver ion.
The ve may be used in an amount of from 0.2 to 20% per weight of the corresponding
layer wherein the additive is added.
In a preferable version of the invention the film does not comprise polypropylene.
The total amount of substantially non-resilient material in the multiplayer film is preferably
% per weight or less, more ably 7% per weight or less, even more ably 5% per
weight or less, in particular 3% per weight or less, based on the total weight of the multilayer
film. Most preferably the multilayer-film does not contain any substantially non-resilient
material.
The total amount of substantially non-resilient material in each outer layer is ably 10%
per weight or less, more preferably 7% per weight or less, even more preferably 5% per
weight or less, in particular 3% per weight or less, based on the total weight of the
corresponding outer layer. Most preferably each outer layer does not contain any substantially
non-resilient material.
In a preferable version of the invention the film presents an antibacterial activity as follows; a
decline of at least 20% of the population of Staphylococcus aureus held in contact with at least
one of the outer layers of the film for 24 hours compared to the initial population. The
measurements are made as per ISO 2196/2011 measurement of the antibacterial activity on
plastics and other non-porous surfaces.
In order to increase the mechanical ties, the film may be cross-linked with one of the
following methods.
E-beam radiation, gamma radiation, moisture inking using silane grafting compounds,
peroxide crosslinking.
The film may be in r form or sealed at the edges or single sheet configuration. It may
also be folded once or many times (as per US 370 for example). It can also be used in
the form of a series of bags, gusseted or non-gusseted, folded or not folded. Centerfold
configuration is also possible.
The preferred production method for the film is the hot blown film method, which is well
known in the art. Other methods like extrusion through flat cast die is also possible.
In a preferable embodiment the film is stored in a cassette prior to use, e.g. a te as
described in US 4,934,529.
According to a second aspect the present ion is directed to a cassette comprising a film
according to the present invention for use in waste packaging applications. In a preferable
embodiment a cassette as described e.g. in US 4,934,529 is used.
According to a third aspect the present invention is directed to the use of a multilayer film
according to the present invention for waste packing, wherein the film is preferably stored in a
cassette.
In a preferable embodiment the film is stored in a cassette prior to use, e.g. a cassette as
described in US 4,934,529.
Mechanical ties
The film of the t application despite its low ess is very good in mechanical
properties such as tensile strength and elongation as per ASTM D882.
In a preferred version of the invention the film has a tensile strength at break of at least 20
N/MM2 in at least one of machine and transverse ion and an elongation of at least 300%
in at least one of e and transverse directions.
EXAMPLES
A 5-layer film is produced in a commercial hot blown film line with the following recipe
Outer layer 1, 80% EAO1+ 15% LDPE+ 5%erucamide based slip masterbatch
Intermediate layer 100% ADH 1
Barrier layer EVOH 1
Intermediate layer 100% ADH1
Outer layer 2 75% EAO2+ 20% LDPE+ 5% erucamide based slip masterbatch
See table 1
The thickness of the structure is 6/1.5/1.5/1.5/5 starting from the outer layer1 and going to the
outer layer 2.
TABLE 1
Type Description Density
g/cm3
EAO1 Ethylene octene copolymer 0.92
EAO2 ne hexane copolymer 0.918
produced with metallocene
catalysts
ADH1 LLDPE mod. 0.92
Adhesive tie
EVOH 1 EVOH with 32% ethylene 1.19
EVOH 2 EVOH with 29% ethylene 1.2
LDPE Low density hylene of
y 0.924 and MFI 0.7 at
190c, 2.16 KG
SLIP Erucamide slip masterbatch
comprising 5% erucamide
The weight of the film is 14.7 g/m2.
EXAMPLE 2
A 5-layer film is produced in a hot blown film commercial line with the following recipe
Outer layer 1, 80% EAO1+ 15% LDPE+ 5% erucamide based SLIP masterbatch
ediate layer 100% ADH 1
Barrier layer EVOH 2
Intermediate layer 100% ADH1
Outer layer 2 80% EAO1+ 15% LDPE+ 5% erucamide based SLIP masterbatch
The thickness of the structure is 5/1.5/1.5/1.5/3 starting from the outer layer 1 and going to the
outer layer 2.
The weight of the material is 12.1 g/m2.
TESTS
1. Tensile strength and elongation test is done ing to ASTM D 882.
2. Odour test is done in the following way.
3. Coefficient of friction
TENSILE STRENGTH and ELONGATION
Tensile strength and elongation is measured as per ASTM D882.
MD stands for machine ion, whereas TD stands for transverse direction.
EXAMPLE TENSILE ELONGATION TENSILE ELONGATION
STRENGTH(MD) (MD) STRENGTH(TD) (TD)
1 29 340 26 440
2 26 290 22.5 405
ODOUR TESTING
soiled diapers are put in a film of the present invention and also in a commercially sold
film. The cially sold film is ed to be monolayer.
The packs are put in PVDC comprising bags, so the odor cannot escape during the time of the
evaluation.
The bags are opened 3 days after the soiling of the diapers and smell was evaluated by a 5-
member panel.
The packs made from EXAMPLE 1 and 2 were found substantially less smelly than the
commercially sold ones.
COEFFICIENT OF FRICTION (COF)
The coefficient of on is measured as per ASTM D1894 (film-to-film-kinetic coefficient of
friction).
The coefficient of friction was measured for the film according to EXAMPLE 2 ed to a
film according to COMPARATIVE EXAMPLE.
The film according to COMPARATIVE EXAMPLE corresponds to the film of EXAMPLE 2,
wherein outer layer 1 and the outer layer 2 comprised an SNR. Hence the film according to
ative Example comprises an Outer layer 1 and an Outer layer 2 with the following
composition:
80% EAO1+ 15% SNR+ 5% erucamide based SLIP masterbatch
Where SNR= a calcium carbonate compound
By comparison of the coefficients of friction of both outer layers we can see that
COF COF
OUTER LAYER 1 TO OUTER LAYER 2 TO
OUTER LAYER 1 OUTER LAYER 2
EXAMPLE 2 0.20 0.19
ATIVE 0.32 0.34
EXAMPLE
Claims (10)
1. A multilayer film with weight less than 20g/m2 for use in malodorous item packaging, wherein the film ses two outer layers comprising ethylene alpha olefin copolymer.
2. The multilayer film according to claim 1, n at least one or both of the outer layers comprise more than 50% per weight ethylene alpha olefin copolymer.
3. The ayer film according to any of the preceding claims, n the film further comprises a barrier layer, preferably the barrier layer comprises EVOH or polyamide.
4. The multilayer film according to any of the preceding claims, wherein the film does not contain polypropylene.
5. The multilayer film according to any of the preceding claims, wherein the total amount of substantially non-resilient material in the film is 10% per weight or less, preferably 7% per weight or less, more preferably 5% per weight or less, even more preferably 3% per weight or less, based on the total weight of the ayer film, most preferably the multilayer-film does not contain any substantially non-resilient material.
6. The multilayer film according to any of the preceding claims, wherein the total amount of substantially non-resilient material in each outer layer is 10% per weight or less, preferably 7% per weight or less, more preferably 5% per weight or less, in particular 3% per weight or less, based on the total weight of the corresponding outer layer, most preferably each outer layer does not contain any substantially non-resilient material.
7. The multilayer film according to any of the ing claims, wherein the film has a weight less than 18 g/m2, preferably less than 17 g/m2, more preferably less than 16 g/m2, even more preferably less than 15 g/m2, most preferably less than 14 g/m2, and in particular less than 13 g/m2.
8. The ayer film according to any of the preceding claims, n the weight of each outer layer is less than 8 g/m2, preferable less than 6 g/m2, more preferably less than 5 g/m2.
9. The multilayer film according to any of the preceding claims, wherein ethylene alpha olefin copolymer is hexene or octene copolymer.
10. The multilayer film according to any of the preceding claims, wherein the film further comprises at least one ediate layer comprising polyamide, preferably the ide is polyamide 6 or polyamide
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20211027.6 | 2020-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ782943A true NZ782943A (en) | 2021-12-24 |
Family
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