EP3768769A1 - Film pour emballage étirable - Google Patents

Film pour emballage étirable

Info

Publication number
EP3768769A1
EP3768769A1 EP19709064.0A EP19709064A EP3768769A1 EP 3768769 A1 EP3768769 A1 EP 3768769A1 EP 19709064 A EP19709064 A EP 19709064A EP 3768769 A1 EP3768769 A1 EP 3768769A1
Authority
EP
European Patent Office
Prior art keywords
film
lldpe
strain
stress
layer
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.)
Pending
Application number
EP19709064.0A
Other languages
German (de)
English (en)
Inventor
Bart VAN DEN ESSCHERT
Lucio Baccaro
Attilio SCALA
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.)
SABIC Global Technologies BV
Original Assignee
SABIC Global Technologies BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SABIC Global Technologies BV filed Critical SABIC Global Technologies BV
Publication of EP3768769A1 publication Critical patent/EP3768769A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/406—Bright, glossy, shiny surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00006—Palletisable loads, i.e. loads intended to be transported by means of a fork-lift truck
    • B65D2571/00012—Bundles surrounded by a film
    • B65D2571/00018—Bundles surrounded by a film under tension
    • B65D2571/0003—Mechanical characteristics of the stretch film
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene

Definitions

  • the present invention relates to a film comprising linear low-density polyethylene (LLDPE), in particular to a film for stretch-wrap packaging.
  • LLDPE linear low-density polyethylene
  • the invention also relates to stretch wrapping of objects using such film, and to articles stretch -wrapped with such film, in particular pallets for storing units such as bags containing bulk goods.
  • Stretch wrapping is a technique by which, upon positioning the packaging units onto the pallet, a film is wrapped around the units in such way that all units are enclosed by the film.
  • films In order to be suitable for such wrapping, films must comply with certain requirements in terms of their properties. The films must, amongst others, have certain capability of adhering to itself, and certain strength to allow resistance to load forces exerted onto the stacks during storage and transportation.
  • Another solution may be to wrap the pallet with a higher density of stretch film, i.e. wrap more layers of the films onto the pallet. Again, this results in a higher film consumption, and thus increased cost, as well as a reduction of the transparency. Thus, also such solution is not particularly desirable.
  • LLDPE stretch-wrap films fail to qualify, resulting in a need to develop LLDPE films that allow for stable packaging under the EU regulations, such as those of the EUMOS 40509 standard incorporated in EU Directive 2014/47, and further provide desirable properties such as tensile properties and optical properties.
  • a parameter by which the required strength for stable packaging of the films can be observed is the slow penetration puncture resistance as determined in accordance with ASTM D5748-95 (2012).
  • LLDPE LLDPE
  • the film demonstrates a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress-strain curve do/de is > 5.0 kPa/%, stress and strain being determined in accordance with ISO 527-3 (1995).
  • Such film demonstrates an improvement in the slow penetration puncture resistance, and allows for use of the film in stretch-wrap applications with improved stability, thereby providing a significant benefit for the transportation industry, for example in being able to more stable and safe stack items onto pallets.
  • the invention relates to a film that demonstrates a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress-strain curve do/de is > 5.0 kPa/%, stress and strain being determined in accordance with ISO 527-3 (1995), tested in the machine direction.
  • the invention relates to a film that demonstrates a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress- strain curve do/de is > 5.0 kPa/%, preferably > 7.5 kPa/%, more preferably > 10.0 kPa/%, even more preferably > 15.0 kPa/%, even further preferably > 20.0 kPa/%, stress and strain being determined in accordance with ISO 527-3 (1995).
  • the film may demonstrate a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress-strain curve do/de is > 5.0 kPa/% and ⁇ 500 kPa/%, preferably > 5.0 kPa/% and ⁇ 200kPa/%, more preferably > 7.5 kPa/% and ⁇ 200 kPa/%, even more preferably > 10.0 kPa/% and ⁇ 200 kPa/%, even further preferably > 15.0 kPa/% and ⁇ 20.0 kPa/%, stress and strain being determined in accordance with ISO 527-3 (1995).
  • the LLDPE has a density of > 900 and ⁇ 940 kg/m 3 as determined in accordance with ASTM D1505 (2010).
  • the LLDPE may have a density of > 910 and ⁇ 930 kg/m 3 , preferably > 915 and ⁇ 925 kg/m 3 , even more preferably > 915 and ⁇ 920 kg/m 3 .
  • the film may for example have a thickness of ⁇ 50 pm, preferably ⁇ 30 pm.
  • the film may have a thickness of > 5.0 and ⁇ 50 pm, preferably > 5.0 and ⁇ 30 pm, more preferably > 10.0 and ⁇ 30.0 pm.
  • the LLDPE may for example have a melt mass flow rate determined in accordance with ASTM D1238 (2013) of > 0.1 and ⁇ 10.0 g/10 min, preferably > 0.3 and ⁇ 8.0 g/10 min, more preferably > 0.5 and ⁇ 5.0 g/10 min, even more preferably > 1.0 and ⁇ 5.0, even further preferably > 2.0 and ⁇ 5.0 g/10 min.
  • the LLDPE is an LLDPE produced in a catalytic process.
  • the LLDPE may be produced in a catalytic process in which the polymerisation reaction is performed in a gas phase, in solution, or in a slurry.
  • the LLDPE may be produced in a catalytic process in which the polymerisation is performed in solution.
  • the LLDPE may be produced using a single-site catalyst.
  • the LLDPE may be produced using a single-site catalyst in a solution process.
  • the determination of the derivative function of the stress-strain curve is a general mathematical method, and is well known to the person of skill.
  • the derivative function presents the slope of a curve at a given point along the curve.
  • the stress-strain curve may be obtained by determining the stress at intervals of strain of 10%, preferable of 5%, over the strain range of 100% to 300%, and fitting the measurements to obtain the equation for the stress-strain curve.
  • the LLDPE may comprise moieties derived from ethylene and moieties derived from one or more comonomer.
  • the comonomer may for example be selected from C4-C10 1 -olefins.
  • comonomer may be selected from 1 -butene, 1 -hexene and 1 -octene.
  • comonomer may be 1 -octene.
  • the LLDPE may for example comprise > 90.0 wt%, preferably > 95.0 wt%, even more preferably > 98.0 wt%, of moieties derived from ethylene, with regard to the total weight of the LLDPE.
  • the LLDPE may for example comprise > 90.0 wt%, of moieties derived from ethylene and ⁇ 10.0 wt% of moieties derived from one or more comonomer, preferably > 95.0 wt%, of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from one or more comonomer, more preferably > 98.0 wt%, of moieties derived from ethylene and ⁇ 2.0 wt% of moieties derived from one or more comonomer, with regard to the total weight of the LLDPE.
  • the LLDPE may comprise > 90.0 wt%, of moieties derived from ethylene and ⁇ 10.0 wt% of moieties derived from one or more comonomer, preferably > 95.0 wt%, of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from one or more comonomer, more preferably > 98.0 wt%, of moieties derived from ethylene and ⁇ 2.0 wt% of moieties derived from one or more comonomer, with regard to the total weight of the LLDPE, wherein the comonomer may be selected from 1 -butene, 1 -hexene and 1 -octene.
  • the LLDPE may comprise > 90.0 wt%, of moieties derived from ethylene and ⁇ 10.0 wt% of moieties derived from one or more comonomer, preferably > 95.0 wt%, of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from one or more comonomer, more preferably > 98.0 wt%, of moieties derived from ethylene and ⁇ 2.0 wt% of moieties derived from one or more comonomer, with regard to the total weight of the LLDPE, wherein the comonomer is 1 -octene.
  • the film of the present invention may be used in a multi-layer film arrangement.
  • such multi-layer film arrangement may comprise at least one layer of the film according to the present invention.
  • such multi-layer film arrangement may comprise one layer of the film according to the present invention.
  • multiple layers of such multi-layer film arrangement are films according to the present invention.
  • each of the layers of such multi-layer film arrangement is a film according to the present invention.
  • Such multi-layer film arrangement may for example be a 3-layer film arrangement, a 5- layer film arrangement, a 7-layer film arrangement, a 9-layer film arrangement, or an 1 1 -layer film arrangement.
  • such multi-layer arrangement may be a 5-layer film
  • such multi-layer film arrangement may be a 7-layer film arrangement.
  • Such multi-layer film arrangement may for example be a 3-layer film arrangement, a 5- layer film arrangement, a 7-layer film arrangement, a 9-layer film arrangement, or an 1 1 -layer film arrangement comprising at least one layer of the film according to the present invention.
  • Such multi-layer film arrangement may for example be a 3-layer film arrangement, a 5-layer film arrangement, a 7-layer film arrangement, a 9-layer film arrangement, or an 1 1 -layer film arrangement comprising one layer of the film according to the present invention.
  • Such multi layer arrangement may for example be a 5-layer film arrangement or a 7-layer film arrangement comprising at least one layer of the film according to the present invention.
  • Such multi-layer arrangement may for example be a 5-layer film arrangement or a 7-layer film arrangement comprising one layer of the film according to the present invention.
  • Such multi-layer arrangement may for example be a 5-layer film arrangement or a 7-layer film arrangement comprising one layer of the film according to the present invention.
  • multiple layers of such multi-layer film arrangement are films according to the present invention, wherein the multi-layer arrangement may for example be a 5-layer film arrangement or a 7-layer film arrangement.
  • each of the layers of such multi-layer film arrangement is a film according to the present invention, wherein the multi-layer arrangement may for example be a 5-layer film arrangement or a 7-layer film arrangement.
  • the multi-layer arrangement may be a 7-layer film arrangement, wherein at least one of the layers is a film according to the invention. More particularly, such multi-layer arrangement may be a 7-layer film arrangement, wherein one of the layers is a film according to the invention. Alternatively, such multi-layer arrangement may be a 7-layer film arrangement, wherein multiple layers of such multi-layer film arrangement are films according to the present invention. Alternatively, such multi-layer film arrangement may be a 7-layer film arrangement, wherein each of the layers of such multi-layer film arrangement are films according to the present invention.
  • the layers of the arrangement preferably adhere to each other.
  • the film according to the invention may for example be produced via cast film extrusion. Where the film is part of an arrangement of multiple layers, it is preferred that each of the layers is produced by melt extrusion of the layers on top of each other.
  • the film may have a width of > 10 cm and ⁇ 300 cm, preferably > 25 cm and ⁇ 150 cm, more preferably > 40 cm and ⁇ 100 cm.
  • the multi-layer film arrangement may for example comprise at least one further film layer comprising a polyethylene other than the LLDPE.
  • a multi-layer film arrangement according to the present invention may for example comprise two outer layers, one on each side of the film. Each outer layer thus is adjacent to only one other layer of the arrangement.
  • the outer layers may be of the same composition, or may each be made of a different composition.
  • the outer layer(s) may each individually be made of the film according to the invention. It is also an embodiment of the invention that both outer layers are made of the film according to the invention.
  • the weight fraction of each of the outer layers may each individually be 5.0-30.0 wt% with regard to the total weight of the multi-layer film arrangement, preferably 5.0-20.0 wt%, more preferably 7.5-15.0 wt%.
  • the weight fraction of one outer layer may differ from the other outer layer or may be the same.
  • each of the outer layers may individually be made of a polyolefin.
  • each outer layer may be made of a polyethylene or a polypropylene, for example a polyethylene having a density of 850-910 kg/m 3 , or of 910-925 kg/m 3 , or of 925-945 kg/m 3 , preferably an ethylene-C4-C8-a-olefin copolymer, such as an ethylene-1 -butene copolymer, and ethylene-1 -hexene copolymer, or an ethylene- 1 -octene copolymer.
  • such polyethylene may be a low-density polyethylene obtained by high- pressure free-radical polymerisation, known in the art as LDPE, for example an LDPE having a density of 900-930 kg/m 3 .
  • the polyethylene may for example have a melt mass-flow rate at 190°C, 2.16 kg of 0.1 -100 g/10 min, preferably 0.5-10.0 g/10 min, more preferably 1 .0-5.0 g/10 min.
  • the polypropylene may for example be a homopolymer or a copolymer, such as a propylene-ethylene random copolymer.
  • the polypropylene may for example have a melt mass- flow rate at 230°C, 2.16 kg of 0.1 -100 g/10 min, preferably 0.5-10.0 g/10 min, more preferably 1 .0-5.0 g/10 min.
  • the arrangement may comprise a core layer, being the centremost layer in the multi layer film arrangement.
  • the core layer preferably comprises or consists of the film of the present invention.
  • the core layer may for example constitute a weight fraction of 20.0-80.0 wt% with regard to the total weight of the multi-layer film arrangement, preferably 30.0 - 70.0 wt%, more preferably 40.0-65.0 wt%. It is preferred that the core layer of the multi-layer film arrangement is made of the film of the present invention.
  • the film according to the present invention may optionally comprise additives.
  • the film may comprise 0.0-2.0 wt%, preferably 0.0-1 .0 wt%, more preferably 0.3-1.0 wt%, of additives, with regard to the total weight of the film.
  • the film may comprise LLDPE and 0.0-2.0 wt%, preferably 0.0-1.0 wt%, more preferably 0.3-1 .0 wt%, of additives, with regard to the total weight of the film.
  • the film may consist of LLDPE and 0.0-2.0 wt%, preferably 0.0-1 .0 wt%, more preferably 0.3-1 .0 wt% of additives, with regard to the total weight of the film.
  • Suitable additives that may be used in the film according to the present invention include for example UV stabilisers, antistatic agents, slip/anti-block agents, fillers, antioxidants, pigments, and fluor elastomers used as polymer processing aids.
  • Particularly suitable additives that may be used in the film of the present invention are erucamide, stearamide, silica and talc.
  • the invention further also relates to the use of the film or the multi-layer arrangement in stretch-wrap packaging of articles.
  • the invention also relates to a pallet comprising a number of objects stacked thereon, wherein the objects are fixed onto the pallet by stretch-wrapping using a film or a multi-layer film arrangement according to the invention.
  • stacked objects may be bags or boxes.
  • the pallet is a pallet as defined in ISO 6780 (2003), preferably the pallet is an EUR pallet.
  • the invention also related to the use of a linear low- density polyethylene having, when tested as a film, a stress-strain relationship of the film such that in the whole region of strain of 100-300% the derivative of the stress-strain curve do/de is > 5.0 kPa/%, stress and strain being determined in accordance with ASTM D882 (2012) for improvement of slow penetration puncture resistance in accordance with ISO 527-3 (1995).
  • the mass fraction presents the fraction of the film that is formed by the extruder in question with regard to the total mass of the 5-layer film.
  • the length of the extruder is expressed as multiplier of the diameter (D) of the extruder screw.
  • Film 1 was produced using Supeer 8315 as the LLDPE.
  • Film 2 was produced using Supeer 7318 as the LLDPE.
  • Film 3 was produced using Exceed 3518CB as the LLDPE. Samples of each of these films were subjected to characterisations.
  • Samples were used having dimensions 24 mm width and 50 mm length. Testing speed was 500 mm/min.
  • Example 1 is to be understood to be an example according to the invention, and examples 2 and 3 to be examples for comparative purposes. The samples were tested in the machine direction.
  • the strain (e) presents the elongation in % of the sample
  • the stress (s) presents the force to be applied to maintain the sample at that elongation in MPa
  • do/de presents the derivative of the stress-strain curve at a given strain, in kPa/%, indicating the increase of force to be applied to maintain elongation at an increased elongation.
  • the data in this table demonstrate that the film according to the invention has a derivative of the stress over strain function in the range of 100 to 300% strain that is particularly high, in fact of above 5 kPa/% over the whole of the range of strain of 100-300%. Further, the force to be applied to the material to maintain elongation continues to increase with each higher elongation.
  • the puncture resistance was determined as the peak force to break (N), expressed in Newton (N) and the energy to break (J), expressed in joule (J) in accordance with ASTM D5748 (1995).
  • the gloss was determined in accordance with ASTM D2457 (2013) as specular gloss at 45° gloss angle, expressed in gloss units (GU).
  • the haze was determined in accordance with
  • TM tensile modulus
  • MD machine direction
  • TD transverse direction
  • TS tensile strength
  • EB elongation at break
  • a film having higher puncture resistance as does the film of the present invention may be used in stretch-wrapping of pallets with improved process continuity, i.e. reduced disturbance of the packaging process caused by breaking of the film during the packaging process.
  • the film of the present invention further is shown to have desirable tensile properties, as well as good optical properties.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Wrappers (AREA)

Abstract

La présente invention concerne un film comprenant du polyéthylène basse densité linéaire (LLDPE), le film présentant une relation contrainte-déformation telle que dans toute la région de contrainte de 100 à 300 % de la dérivée de la courbe de contrainte-déformation dσ/dε est > 5,0 kPa/%, la contrainte et la déformation étant déterminées conformément à la norme ISO 527-3 (1995). Un tel film fait preuve d'une amélioration de la résistance à la perforation par pénétration lente, et permet l'utilisation du film dans des applications d'emballage étirable avec une stabilité améliorée, d'où l'obtention d'un bénéfice considérable pour l'industrie du transport, par exemple en permettant des piles d'articles plus stables et plus sûres sur des palettes.
EP19709064.0A 2018-03-20 2019-03-12 Film pour emballage étirable Pending EP3768769A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18162797 2018-03-20
PCT/EP2019/056152 WO2019179827A1 (fr) 2018-03-20 2019-03-12 Film pour emballage étirable

Publications (1)

Publication Number Publication Date
EP3768769A1 true EP3768769A1 (fr) 2021-01-27

Family

ID=61691875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19709064.0A Pending EP3768769A1 (fr) 2018-03-20 2019-03-12 Film pour emballage étirable

Country Status (2)

Country Link
EP (1) EP3768769A1 (fr)
WO (1) WO2019179827A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240075726A1 (en) * 2019-10-09 2024-03-07 Sabic Global Technologies B.V. Bag for containing bulk goods

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5814399A (en) * 1996-03-12 1998-09-29 Tenneco Packaging Stretch wrap films
US6361875B1 (en) * 1999-11-20 2002-03-26 Intertape, Inc. Premium hand wrap multi-layer film products
CN106457791B (zh) * 2014-04-01 2019-06-14 沙特基础工业公司 多层膜
EP3009263A1 (fr) * 2014-10-15 2016-04-20 Trioplast AB Film barrière
EP3184301A1 (fr) * 2015-12-22 2017-06-28 Trioplast AB Presse-enrubanneuse pre-etiree
CA3051208A1 (fr) * 2017-01-26 2018-08-02 Dow Global Technologies Llc Films multicouches a rheodurcissement ajustable

Also Published As

Publication number Publication date
WO2019179827A1 (fr) 2019-09-26

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