EP0998388B1 - Sachets destines a emballer des matieres fluides - Google Patents

Sachets destines a emballer des matieres fluides Download PDF

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Publication number
EP0998388B1
EP0998388B1 EP97905720A EP97905720A EP0998388B1 EP 0998388 B1 EP0998388 B1 EP 0998388B1 EP 97905720 A EP97905720 A EP 97905720A EP 97905720 A EP97905720 A EP 97905720A EP 0998388 B1 EP0998388 B1 EP 0998388B1
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Prior art keywords
pouch
ethylene
percent
weight
minutes
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German (de)
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EP0998388A4 (fr
EP0998388A1 (fr
EP0998388B9 (fr
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Daniel James Falla
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Dow Global Technologies LLC
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Dow Global Technologies LLC
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    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form

Definitions

  • This invention relates to a pouch used in consumer packaging made from certain film structures useful for packaging flowable materials, for example liquids such as milk.
  • U.S. Patent Nos. 4,503,102, 4,521,437 and 5,288,531 disclose the preparation of a polyethylene film for use in the manufacture of a disposable pouch for packaging of liquids such as milk.
  • U.S. Patent No. 4,503,102 discloses pouches made from a blend of a linear ethylene copolymer copolymerized from ethylene and an alpha-olefin at the C 4 to C 10 range and a ethylene-vinyl acetate polymer copolymerized from ethylene and vinyl acetate.
  • the linear polyethylene copolymer has a density of from 0.916 to 0.930 g/cm3 and a melt index of from 0.3 to 2.0 g/10 minutes.
  • the ethylene-vinyl acetate polymer has a weight ratio of ethylene to vinyl acetate from 2.2:1 to 24:1 and a melt index of from 0.2 to 10 g/10 minutes.
  • the blend disclosed in U.S. Patent No. 4,503,102 has a weight ratio of linear low density polyethylene to ethylene-vinyl acetate polymer of from 1.2:1 to 4:1
  • U.S. Patent No. 4,503,102 also discloses laminates having as a sealant film the aforementioned blend.
  • U.S. Patent No. 4,521,437 describes pouches made from a sealant film which is from 50 to 100 parts of a linear copolymer of ethylene and octene-1 having a density of from 0.916 to 0.930 g/cm3 and a melt index of 0.3 to 2.0 g/10 minutes and from 0 to 50 parts by weight of at least one polymer selected from the group consisting of a linear copolymer of ethylene and a C 4 -C 10 -alpha-olefin having a density of from 0.916 to 0.930 g/cm 3 and a melt index of from 0.3 to 2.0 g/10 minutes, a high-pressure polyethylene having a density of from 0.916 to 0.924 g/cm3 and a melt index of from 1 to 10 g/10 minutes and blends thereof.
  • the sealant film disclosed in the U:S. Patent No. 4,521,437 was selected on the basis of providing (a) pouches with a M-test value substantially smaller, at the same film thickness, than that obtained for pouches made with film of a blend of 85 parts of a linear ethylene/butene-1 copolymer having a density of 0.919 g/cm 3 and a melt index of 0.75 g/10 minutes and 15 parts of a high pressure polyethylene having a density of 0.918 g/cm3 and a melt index of 8.5 g/10 minutes, or (b) an M(2)-test value of less than 12%, for pouches having a volume of from greater than 1.3 to 5 liters, or (c) an M(1.3)-test value of less than 5% for pouches having a volume of from 0.1 to 1.3 liters.
  • the M, M(2) and M(1.3)-tests are defined pouch drop tests in U.S. Patent No. 4,521,437.
  • the pouches may also be made from composite films in which the sealant film forms at least the inner layer.
  • the high-pressure polyethylene described in US. Patent No. 4, 521, 437 is not described as having a high melt strength and all of the high-pressure polyethylene resins employed in the examples have a melt index greater than 1 g/10 minutes.
  • there is teaching in said patent that for ethylene polymer blends strength does not correlate with hot tack strength or leaker performance.
  • U.S. Patent No. 5,288,531 discloses pouches made from a film structure having a blend of (a) from 10 to 100 percent by weight of at least one polymeric seal layer of an ultra low density linear ethylene copolymer interpolymerized from ethylene and at least one alpha-olefin in the range of C 3 -C 10 with a density of from 0.89 g/cm3 to less than 0.915 g/cm3 and (b) from 0 to 90 percent by weight of at least one polymer selected from the group consisting of a linear copolymer of ethylene and a C 3 -C 18 -alpha-olefin having a density of greater than 0.916 g/cm3 and a melt index of from 0.1 to 10 g/10 minutes, a high-pressure low density polyethylene having a density of from 0.916 to 0.930 g/cm3 and a melt index of from 0.1 to 10 g/10 minutes, or ethylene-vinyl acetate copo
  • the polyethylene pouches known in the prior art have some deficiencies.
  • the problems associated with films known in the prior art relate to the sealing properties and performance properties of the film for preparing pouches,
  • prior art films made into pouches in general have a high incident of "leakers", i.e., seal defects such as pinholes which develop at or near the seal in which flowable material, for example milk escapes from the pouch.
  • seal defects such as pinholes which develop at or near the seal in which flowable material, for example milk escapes from the pouch.
  • the seal and performance properties of the prior art films have been generally satisfactory, there is still a need in the industry for better seal and performance properties in films for manufacture of hermetically sealed pouches containing flowable materials. More particularly, there is a need for improved sealing properties of the film such as hot tack and melt strength in order to improve the processability of the film and to improve pouches made from the films.
  • the line speed of known packaging equipment used for manufacturing pouches such as form, fill and seal machines, is currently limited by the sealing properties of the film used in the machines.
  • Prior art polyethylene films have low melt strength. Therefore, the speed at which a form, fill and seal machine can produce a pouch is limited and, thus, the number of pouches produced on a form, fill and seal machine is limited. If the melt strength is increased, then the speed of a form, fill and seal machine can be increased and, thus, the number of pouches produced can be increased.
  • the present invention provides a pouch containing a flowable material, said pouch being made from a film structure with at least one seal layer of a polymeric composition
  • a polymeric composition comprising: (a) from 10 to 100 percent, based on the total weight of said composition, of a mixture of (1) from 5 to 95 percent by weight, based on 100 weight parts of said mixture, of linear ethylene copolymer interpolymerized from ethylene and at least one alpha-olefin in the range of C3-C18 and having a density from 0.916 to 0.940g/cm3 and a melt Index of less than 10g/10 minutes, and a molecular weight distribution, Mw/Mn, ratio of greater than 4.0, and a peak melting point greater than 100°C as measured by a differential scanning colorimeter, and (2) from 5 to 95 percent by weight, based on 100 weight parts of said mixture, of high pressure low density polyethylene having a density from 0.916 to 0.930g/cm 3 , a melt index of less than 1
  • One embodiment of the present invention is a pouch made from a two-layer coextruded film containing an outer layer of linear low density polyethylene and an inner seal layer of the aforementioned polymeric composition.
  • Another embodiment of the present invention is a pouch made from a three-layer coextruded film containing an outer layer and a core layer of linear low density polyethylene and an inner seal layer of the aforementioned polymeric composition.
  • Another aspect of the present invention is a process for preparing the aforementioned pouch.
  • Yet another embodiment of the present invention is a pouch made from a three-layer coextruded film containing an outer layer and a core layer of high pressure low density polyethylene and an inner seal layer of the aforementioned polymeric composition.
  • the film structures for the pouches of the present invention have an improved melt strength and heat seal strength, particularly the end-seal strength.
  • Use of the films for making pouches of the present invention in form, fill and seal machines leads to machine speeds higher than currently obtainable with the use of commercially available film.
  • the pouch of the present invention for example as shown in Figure 1 and 2, for packaging flowable materials is manufactured from a monolayer film structure of a polymeric seal layer which is a blend of a linear low density polyethylene and a high pressure low density polyethylene having a high melt strength.
  • the blend can also contain an ethylene vinylacetate copolymer.
  • Melt strength which is also referred to in the relevant art as “melt tension” is defined and quantified herein to mean the stress or force (as applied by a wind-up drum equipped with a strain cell) required to draw a molten extrudate at some specified rate above its melting point as it passes through the die of a standard plastometer such as the one described in ASTM D1238-E. Melt strength values, which are reported herein in centi-Newtons (cN), are determined using a Gottfert Rheotens at 190°C.
  • melt strength tends to increase with increased molecular weight, or with broadening of the molecular weight distribution and/or with increased melt flow ratios.
  • the melt strength of the high pressure low density polyethylene of the present invention is greater than 10 cN as determined using a Gottfert Rheotens unit at 190°C, preferably from 13 to 40 cN, and most preferably 15 to 25cN.
  • the melt strength of the polymeric composition of the present invention is greater than 10 cN as determined using Gottfert Rheotens unit at 190°C, preferably from 15 to 70 cN, and most preferably 15 to 50.
  • LLDPE linear low density polyethylene
  • DOWLEXTM 2045 Trademark of and commercially available from The Dow Chemical Company
  • the LLDPE is generally a linear copolymer of ethylene and a minor amount of an ⁇ -olefin having from 3 to 18 carbon atoms, preferably from 4 to 10 carbon atoms and most preferably 8 carbon atoms.
  • the LLDPE for the polymeric composition of the present invention has a density of from 0.916 to 0.940 g/cm 3 , most preferably from 0.918 to 0.926 g/cm 3 ; has a melt index of less than 10 g/10 minutes , preferably from 0.1 to 10 g/10 minutes , most preferably from 0.5 to 2 g/10 minutes and generally has an I 10 /I 2 ratio of from 0.1 to 20, preferably from 5 to 20, and most preferably 7 to 20.
  • the LLDPE can be prepared by the continuous, batch or semi-batch solution, slurry or gas phase polymerization of ethylene and one or more optional ⁇ -olefin comonomers in the presence of a Ziegler Natta catalyst, such as by the process disclosed in U.S. Patent No. 4,076,698 to Anderson et al.
  • the interpolymerization process can be a solution, slurry or gas phase technique or combinations thereof.
  • Suitable ⁇ -olefin for use as comonomers include 1-propylene, 1-butene, 1-isobutylene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene and 1-octene, as well as other monomer types such as styrene, halo- or alkyl-substituted styrenes, tetrafluoro-ethylene, vinyl benzocyclobutane, 1,4-hexadiene, 1,7-octadiene, and cycloalkenes, e.g., cyclopentene, cyclohexene and cyclooctene.
  • the ⁇ -olefin will be 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, or mixtures thereof. More preferably, the ⁇ -olefin will be 1-hexene, 1-heptene, 1-octene, or mixtures thereof, as coatings, profiles and films fabricated with the resultant extrusion composition will have especially improved abuse properties where such higher ⁇ -olefins are utilized as comonomers. However, most preferably, the ⁇ -olefin will be 1-octene and the polymerization process will be a continuous solution process.
  • the molecular weight distribution of the ethylene ⁇ -olefin interpolymer compositions and the high pressure ethylene polymer compositions are determined by gel permeation chromatography (GPC) on a Waters 150 high temperature chromatographic unit equipped with differential refractometer and three columns of mixed porosity.
  • the columns are supplied by Polymer Laboratories and are commonly packed with pore sizes of 10 3 , ,10 4 , 10 5 and 10 6 ⁇ .
  • the solvent is 1,2,4-trichlorobenzene, from which 0.3 percent by weight solutions of the samples are prepared for injection.
  • the flow rate is 1.0 milliliters/minute, unit operating temperature is 140°C and the injection size is 100 microliters.
  • the molecular weight determination with respect to the polymer backbone is deduced by using narrow molecular weight distribution polystyrene standard (from Polymer Laboratories) in conjunction with their elution volumes.
  • the Mw/Mn is preferably 2 to 7, especially 4.
  • LDPE having high melt strength in a film structure for pouches of the present invention (1) provided a pouch that can be fabricated at a fast rate through a form, fill and seal machine, and (2) provides a pouch package having few leakers, particularly when the pouch of the present invention is compared to pouches made with linear low density polyethylene, low density polyethylene or a combination thereof.
  • the film structure of the pouch of the present invention also includes a multilayer or composite film structure 30, preferably containing the above-described polymer seal layer being the inner layer of the pouch.
  • the multilayer film structure for the pouch of the present invention may contain various combination of film layers as long as the seal layer forms part of the ultimate film structure.
  • the multilayer film structure for the pouch of the present invention may be a coextruded film, a coated film or a laminated film.
  • the film structure also included the seal layer in combination with a barrier film such as polyester, nylon, EVOH, polyvinylidene dichloride (PVDC) such as SARANTM (Trademark of The Dow Chemical Company) and metallized films.
  • PVDC polyvinylidene dichloride
  • SARANTM Trademark of The Dow Chemical Company
  • the end use for the pouch tends to dictate, in a large degree, the selection of the other material or materials used in combination with the seal layer film.
  • the pouches described herein will refer to seal layers used at least on the inside of the pouch.
  • One embodiment of the film structure 30 for the pouch of the present invention comprises seal layer 31 of a blend of LLDPE and high melt strength LDPE of this invention and at least one polymeric outer layer 32.
  • the polymeric outer layer 32 is preferably a polyethylene film layer, more preferably a LLDPE.
  • An example of a commercially available LLDPE is DOWLEXTM 2045 (Trademark of the commercially available from The Dow Chemical Company).
  • the thickness of the outer layer 32 may be any thickness so long as the seal layer 31 has a minimum thickness of 0.1 mil (2.5 microns).
  • film structure 30 for the pouch of the present invention comprises the polymeric layer 32 sandwiched between two polymeric seal layers 31.
  • Still another embodiment of the film structure 30 for the pouch of the present invention comprises at least one polymeric core layer 33 between at least one polymeric outer layer 32 and at least one polymeric seal layer 31.
  • the polymeric layer 33 may be the same LLDPE film layer as the outer layer 32 or preferably a different LLDPE, and more preferably an LLDPE, for example DOWLEXTM 204S (Trademark of and commercially available from The Dow Chemical Company) that has a higher density than the outer layer 32.
  • the thickness of the core layer 33 may be any thickness so long as the seal layer 31 has a minimum thickness of 0.1 mil (2.5 microns).
  • the ultimate film thickness of the final film product used for making the pouch of the present invention is from 0.5 mil (12.7 microns) to 10 mils (254 microns), preferably from 1 mil (25.4 microns) to 5 mils (127 microns); more preferably from 2 mils (50.8 microns) to 4 mils (100 microns).
  • Additives known to those skilled in the art, such as anti-block agents, slip additives, UV stabilizers, pigments and processing aids may be added to the polymers from which the pouches of the present invention are made.
  • the film structure for the pouches of the present invention has design flexibility. Different LLDPE can be used in the outer and core layers to optimize specific film properties such as film stiffness. Thus, the film can be optimized for specific applications such as for a vertical form, film and seal machine.
  • the polyethylene film structure used to make a pouch of the present invention is made by either the blown tube extrusion method or the cast extrusion method, methods well known in the art.
  • the blown tube extrusion method is described, for example, in Modern Plastics Mid-October 1989 Encyclopedia Issue, Volume 66, Number 11, pages 264 to 266.
  • the cast extrusion method is described, for example, in Modern Plastics Mid-October 1989 Encyclopedia Issue, Volume 66, Number 11, pages 256 to 257.
  • Embodiments of the pouches of the present invention are hermetically sealed containers filled with "flowable materials".
  • flowable materials it is meant, materials which are flowable under gravity or which may be pumped.
  • the term “flowable materials” does not include gaseous materials.
  • the flowable materials include liquids for example milk, water, fruit juice, oil; emulsions for example ice cream mix, soft margarine; pastes for example meat pates, peanut butter; preservers for example jams, pie fillings marmalade; jellies; doughs; ground meat for example sausage meat; powders for example gelatin powders, detergents; granular solids for example nuts, sugar; and like materials.
  • the pouch of the present invention is particularly useful for liquid foods for example milk.
  • the flowable material may also include oleaginous liquids for example cooking oil or motor oil.
  • the film structure for the pouch of the present invention is made, the film structure is cut to the desired width for use in conventional pouch-forming machines.
  • the embodiments of the pouch of the present invention shown in Figures 1 and 2 are made in so-called form, fill and seal machines well known in the art.
  • a pouch 10 being a tubular member 11 having a longitudinal lap seal 12 and transverse seals 13 such that, a "pillow-shaped" pouch is formed when the pouch is filled with flowable material.
  • a pouch 20 being a tubular member 21 having a peripheral fin seal 22 along three sides of the tubular member 21, for example, the top seal 22a and the longitudinal side seals 22b and 22c, and having a bottom substantially concave or "bowt-shaped” member 23 sealed to the bottom portion of the tubular member 21 such that when viewed in cross-section, longitudinally, substantially a semi-circular or “bowed-shaped” bottom portion is formed when the pouch is filled with flowable material.
  • the pouch shown in Figure 2 is an example of so-called "Enviro-Pak" pouch known in the art.
  • the pouch manufactured according to the present invention is preferably the pouch shown in Figure 1 made on so-called vertical form, fill and seal (VFFS) machines well known in the art.
  • VFFS vertical form, fill and seal
  • Examples of commercially available VFFS machines include those manufactured by Hayssen, Thimonnier, Tetra Pak, or Prepac.
  • a VFFS machine is described in the following reference: F. C. Lewis, "Form-Fill-Seal," Packaging Encyclopedia, page 180, 1980.
  • a sheet of the plastic film structure described herein is fed into a VFFS machine where the sheet is formed into a continuous tube in a tube-forming section.
  • the tubular member is formed by sealing the longitudinal edges of the film together - either by lapping the plastic film and sealing the film using an inside/outside seal or by fin sealing the plastic film using an inside/inside seal.
  • a sealing bar seals the tube transversely at one end being the bottom of the "pouch", and then the fill material, for example milk, is added to the "pouch.”
  • the sealing bar then seals the top end of the pouch and either burns through the plastic film or cuts the film, thus, separating the formed completed pouch from the tube.
  • the process of making a pouch with a VFFS machine is generally described in U.S. Patent Nos. 4,503,102 and 4,521,437.
  • the capacity of the pouches of the present invention may vary.
  • the pouches may contain from 5 milliliters to 10 liters, preferably from 1 milliliter to 8 liters, and more preferably from 1 milliliter to 5 liters of flowable material.
  • the film structure for the pouch of the present invention has precisely controlled strength.
  • the use of the film structure described in the present invention for making a pouch results in a stronger pouch, and, therefore, more preferably, the pouch contains fewer use-related leakers.
  • the use of a LLDPE and LDPE blend in the seal layer of the present invention in a two or three-layer coextruded film product will provide a film structure that can be used for making pouches at a faster rate in the VFFS and such pouches produced will contain fewer leakers.
  • the polyethylene pouch of the present invention is a good alternative.
  • the use of the polyethylene pouch for packaging consumer liquids such as milk has its advantages over containers used in the past: the glass bottle, paper carton, and high density polyethylene jug.
  • the previously used containers consumed large amounts of natural resources in their manufacture, required a significant amount of space in landfill, used a large amount of storage space and used more energy in temperature control of the product (due to the heat transfer properties of the container).
  • the polyethylene pouch of the present invention made of thin polyethylene film, used for liquid packaging, offers many advantages over the containers used in the past.
  • the polyethylene pouch (1) consumes less natural resources, (2) requires less space in a landfill, (3) can be recycled, (4) can be processed easily, (5) requires less storage space, (6) uses less energy for storage (heat transfer properties of package), (7) can be safely incinerated and (8) can be reused, for example, the empty pouch can be used for other applications such as freezer bags, sandwich bags, and general purpose storage bags.
  • Erucamide, a slip agent; SiO 2 , an antiblock agent; and a processing aid were added to each of the resins described in Table I such that the final concentrations of the additives were as follows: 1200 ppm Erucamide; 2500 ppm SiO 2 .
  • the hot tack strength of sample films was measured using the "DTC Hot Tack Test Method," which measures the force required to separate a heat seal before the seal has had a chance to fully cool (crystallize). This simulates the filling of material into a pouch before the seal has had a chance to cool.
  • the "DTC Hot Tack Test Method” is a test method using a DTC Hot Tack Tester Model #52D according to the following conditions: Specimen Width: 25.4 mm Sealing Time: 0.5 seconds Sealing Pressure: 0.27 N/mm/mm Delay Time: 0.5 seconds Peel Speed: 150 mm/seconds Number of Samples/Temperature 5 Temperature Increments: 5°C Temperature Range: 75°C -150°C
  • the heat seal strength of sample films was measured using the "DTC Heat Seal Strength Test Method," which is measure designed to measure the force required to separate a seal after the material has cooled to 23°C temperature.
  • the film samples were exposed to a relative humidity of 50 percent and a temperature of 23°C for a minimum of 24 hours prior to testing.
  • the "DTC Heat Seal Strength Test Method” uses a DTC Hot Tack Tester Model #52D, wherein the heat seal portion of the tester is used, according to the following conditions: Specimen Width 25.4 mm Sealing Time 0.5 seconds Sealing Pressure 0.27 N/mm/mm Number of Samples/temperatures 5 Temperatures Increments 5°C Temperature Range 80°C - 150°C
  • the seal strength of the film samples was determined using an Instron Tensile Tester Model #1122 according to the following test conditions: Direction of Pull 90° to seal Crosshead Speed 500 mm/minute Full Scale Load 5 kg Number of Samples/Threshold 1 percent of FSL Break Criterion 80 percent Gauge Length 2.0 inches (50.8 millimeters) Sample Width 1.0 inch (25.4 millimeters) Table III: Multilayer (A/B/A) Films for Physical Property Testing Example No.
  • a AFFINITY PL 1880 ? 2.54 (*) % refers to percent by weight of LDPE in the blend
  • Table III Physical properties of films shown in Table III are reported in Table IV below. Some results of hottack and heat seal strength are reported in Tables VI and VII.
  • Table IV Physical Properties of Multilayer Films AFF 1880+2 0% 135l 80% Id IN core) AFF 1880+ 20% 135l 3MIL AFF 1880+ 20% 135l AFF 1880 + 20% XU 60021.6 2 AFF 1880 + 20% 5031 AFF 1880 + 20% 526l AFFINITY 1880 Gauge mil 2.49 3.18 2.46 2.50 2.50 2.10 2.54 Elmendorf Tear f M253D
  • Table VI Hottack/Heat Seal Strength Hot Tack Strength, N/in DOWLEX 2045 DOWLEX 2045 + 20% LDPE 135I DOWLEX 2045 + 20% LDPE 609C DOWLEX 2045 + 20% XU60021.62 TEMPERATURE °C 90 0.23 0.14 0.22 0.19 95 0.17 0.21 0.15 0.19 100 0.64 0.62 0.66 0.68
  • the present invention is illustrated by the following examples but is not to be limited thereby.
  • the film samples described in Table III were made as a monolayer using a Macro blown film line.
  • the extruder was 2-1/2 inches (6.4 cm) in diameter and had a 24:1 L/D ratio and a barrier screw with a Maddock mixing head.
  • a 6 inch (15.2 cm) diameter die was used with a 60 mil (1,524 microns) die gap for the manufacture of the test films.
  • the fabrication conditions for the blown film live were a blow-up ratio of 2.5 and a melt temperature of 220°C.
  • the films described in Table III were slit to a width of 15 inches (38.1 cm)to produce 2-liter milk pouches using a Prepac IS6 Vertical, Form, Fill and Seal machine located at a commercial dairy.
  • the unit packaged 2-liter milk filled pouches at the rate of 30 pouches per minute per filling head under normal operating conditions.
  • approximately 16-20 milk-filled pouches were collected. They were inspected for initial seal integrity. 6-8 pouches were tested on site for heat seal strength and 10 pouches were drained, washed and dried for further evaluation.
  • the seal strength was determined using an Instron Tensile Tester Model #1122. Sample were expose to a relative humidity of 50% and 23°C for 24-48 hours prior to testing. The Instron test conditions were as follows: Direction of pull: 90° to seal Crosshead speed: 500 mm/min. Full Scale Load: 5 kg Threshold: 1% of FSL Break Criterion 80% Gauge length: 2.0 in. (50.8 mm) Sample width: 1.0 in. (25.4 mm)
  • the DOWLEX 2045 films were found to have significant seal thinning and end seal stringers as shown in Table IX.
  • the pouches made with 20% 609C were found to have some seal thinning and some end seal stringers.
  • No seal thinning or stringers were found with the 20% 135I and XU 60021.62 films.
  • seal strengths are shown in Table X. Seal strength was found to increase as the melt strength of the blend increased. This finding is graphically illustrated in Fig. 6 using a blend of 80% by weight of LLDPE and 20% by weight of LDPE, except the first data point having melt strength of 6.4 cN did not contain any LDPE. No correlation was evident between LDPE melt index and seal strength.
  • the films made with 20% 135I and XU 60021.62 showed very little seal thinning and no end seal stringers (fine polymer filaments coming from the seal area), while the films made with 100% DOWLEX 2045 had significant seal thinning and stringers.
  • the weakest part of a good seal is typically the film just in front of the seal bead. Any thinning of this film results in lower seal strengths since this is the region that fails when the seal is stressed. Comparing the melt strength of the resin blends (Table II) with the amount of film thinning seen with the pouches made with a commercial VFFS unit (Table XI), it is seen that, as the melt strength of the resin blend increased, the amount of film thinning decreased. No correlation was seen between film thinning (Table XI) and melt index of LDPE in resin blends (Table I).
  • Table VIII Liconsa Dairy Prepac VFFS Evaluation Subjective Seal Strengths Run # LLDPE LDPE % LDPE # Pouches Tested # Seal Failure 1 DOWLEX 2045 0 7 3 2 DOWLEX 2045 609C 20 8 2 3 DOWLEX 2045 135l 20 6 0 4 DOWLEX 2045 XU.62 20 7 0
  • Table IX Liconsa Dairy Prepac VFFS Evaluation Visual Examination of End Seals Run # LLDPE LDPE % LDPE Visual Examination of Seal 1 DOWLEX 2045 - 0 heavy stringers, seal thinning 2 DOWLEX 2045 609C 20 heavy stringers, seal thinning 3 DOWLEX 2045 135I 20 no stringers 4 DOWLEX 2045 XU.62 20 no stringers
  • Table XII Resin Blends Blend Description Blend Description 1 DOWLEX 2045 2 DOWLEX + 10% LDPE XU 60021.62 3 DOWLEX + 20% LDPE XU 60021.62 4 DOWLEX + 30% LDPE XU 60021.62 5 DOWLEX + 40% LDPE XU 60021.62 6 DOWLEX + 50% LDPE XU 60021.62 7 DOWLEX + 60% LDPE XU 60021.62 8 DOWLEX + 70% LDPE XU 60021.62 9 DOWLEX + 80% LDPE XU 60021.62 10 DOWLEX + 90% LDPE XU 60021.62 (*) % refers to percent by weight of the amount of LDPE in various blends.
  • the resin blends of Table XII were used to fabricate 2.8 mil (71 microns)thick films using a MACRO ® blown film line having a barrier screw with a diameter of 2 1/2 inches (63.5 mm, 24:1 L/D ratio and Maddock mixing head. A six inch (15.2 cm) die with a 60 mil (1524 microns) die gap was used. A Macro dual lip air ring supplied with chilled air was used. Each resin was blended to a target of 1200 ppm erucamide slip and 2500 ppm SiO 2 antiblock. Each film was tested for hottack and heat seal strength, values reported in Table XIII and Table XIV, respectively.
  • the hottack strength was determined using a DTC Hottack Tester Model #D52D under the conditions described hereinabove.
  • the test films were heat sealed using the DTC Hottack Tester Model #D52D under the conditions described hereinabove.
  • the heat seal strength was determined using an Instron Tensile Tester Model #1122. Test samples were exposed to a relative humidity of 50 percent and 23°C for 24 to 48 hours prior to testing. The Instron test conditions were the same as described hereinabove.
  • HOTTACK (0.5 X LLDPE hottack) + (0.5 X LDPE hottack) Predicted vs. Actual Hottack Strength Temp. (°C)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)
  • Bag Frames (AREA)

Claims (25)

  1. Poche contenant une matière coulante, laquelle poche est faite d'une structure en film comportant au moins une couche à scellage en une composition de polymères comprenant :
    a) de 10 à 100 %, par rapport au poids total de ladite composition, d'un mélange
    1) de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un copolymère linéaire d'éthylène, interpolymère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et présentant une masse volumique de 0,916 à 0,940 g/cm3, un indice de fluidité à chaud inférieur à 10 g/10 min, un rapport Mw/Mn, indice de distribution des masses moléculaires, supérieur à 4,0 et un point de fusion (pic en analyse enthalpique différentielle) supérieur à 100 °C,
    2) et de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un polyéthylène basse densité haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3, un indice de fluidité à chaud inférieur à 1 g/10 min et une résistance à l'état fondu, mesurée à 190 °C au moyen d'un appareil Goettfert Rheotens, supérieure à 10 cN,
    b) et de 0 à 90 %, par rapport au poids total de ladite composition, d'un copolymère d'éthylène et d'acétate de vinyle où le rapport pondéral de l'éthylène à l'acétate de vinyle vaut de 2,2/1 à 24/1 et dont l'indice de fluidité à chaud vaut de 0,2 à 10 g/10 min.
  2. Poche contenant une matière coulante, laquelle poche est faite d'une structure en film multicouche comportant :
    I) une couche d'une composition de polymères comprenant :
    a) de 10 à 100 %, par rapport au poids total de ladite composition, d'un mélange
    1) de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un copolymère linéaire d'éthylène, interpolymère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et présentant une masse volumique de 0,916 à 0,940 g/cm3, un indice de fluidité à chaud inférieur à 10 g/10 min, un rapport Mw/Mn, indice de distribution des masses moléculaires, supérieur à 4,0 et un point de fusion (pic en analyse enthalpique différentielle) supérieur à 100 °C,
    2) et de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un polyéthylène basse densité haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3, un indice de fluidité à chaud inférieur à 1 g/10 min et une résistance à l'état fondu, mesurée à 190 °C au moyen d'un appareil Goettfert Rheotens, supérieure à 10 cN,
    b) et de 0 à 90 %, par rapport au poids total de ladite composition, d'un copolymère d'éthylène et d'acétate de vinyle où le rapport pondéral de l'éthylène à l'acétate de vinyle vaut de 2,2/1 à 24/1 et dont l'indice de fluidité à chaud vaut de 0,2 à 10 g/10 min ;
    II) et au moins une couche d'un copolymère linéaire d'éthylène, interpoly-mère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et pré-sentant une masse volumique de 0,916 à 0,940 g/cm3 et un indice de fluidité à chaud de 0,1 à 10 g/10 min.
  3. Poche conforme à la revendication 1, dans laquelle ladite structure en film est de forme tubulaire et les extrémités de ladite poche sont thermoscellées transversalement.
  4. Poche conforme à la revendication 2, dans laquelle il y a en outre :
    III) une couche d'un polyéthylène haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3 et un indice de fluidité à chaud de 0,1 à 10 g/10 min.
  5. Poche conforme à la revendication 2, dans laquelle la couche (I) est une couche à scellage.
  6. Poche conforme à la revendication 2, dans laquelle la couche (II) est une couche externe et la couche (I) est une couche à scellage.
  7. Poche conforme à la revendication 4, dans laquelle la couche (II) est une couche externe, la couche (III) est une couche de coeur, et la couche (I) est une couche à scellage.
  8. Poche conforme à la revendication 1, laquelle poche peut contenir de 5 à 10 000 mL de matière.
  9. Poche conforme à la revendication 1, dans laquelle la matière coulante est du lait.
  10. Poche conforme à la revendication 1, dans laquelle le copolymère d'éthylène présente un indicateur I10/I2 de distribution des masses mo-léculaires de 0,1 à 20.
  11. Poche conforme à la revendication 1, dans laquelle la structure en film contient un agent de glissement et un agent antiadhérent, et en op-tion, un auxiliaire de traitement.
  12. Poche conforme à la revendication 1, dans laquelle la structure en film contient un pigment servant à rendre opaque la structure en film.
  13. Poche conforme à la revendication 1, dans laquelle la structure en film contient un adjuvant absorbant le rayonnement ultraviolet.
  14. Poche conforme à la revendication 1, dans laquelle l'alpha-oléfine de la structure en film est du 1-octène.
  15. Poche conforme à la revendication 1, dans laquelle la résis-tance à l'état fondu du polyéthylène basse densité haute pression vaut de 10 à 40 cN.
  16. Poche conforme à la revendication 1, dans laquelle la résis-tance à l'état fondu du polyéthylène basse densité haute pression vaut de 13 à 25 cN.
  17. Poche conforme à la revendication 1, dans laquelle la résis-tance à l'état fondu de la composition de polymères vaut de 10 à 70 cN.
  18. Poche conforme à la revendication 1, dans laquelle l'amincissement dans la zone de bordure est inférieur à 25 %.
  19. Structure en film d'une composition de polymères, conçue pour servir d'emballage, comprenant :
    a) de 10 à 100 %, par rapport au poids total de ladite composition, d'un mélange
    1) de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un copolymère linéaire d'éthylène, interpolymère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et présentant une masse volumique de 0,916 à 0,940 g/cm3, un indice de fluidité à chaud inférieur à 10 g/10 min, un rapport Mw/Mn, indice de distribution des masses moléculaires, supérieur à 4,0 et un point de fusion (pic en analyse enthalpique différentielle) supérieur à 100 °C,
    2) et de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un polyéthylène basse densité haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3, un indice de fluidité à chaud inférieur à 1 g/10 min et une résistance à l'état fondu, mesurée à 190 °C au moyen d'un appareil Goettfert Rheotens, supérieure à 10 cN,
    b) et de 0 à 90 %, par rapport au poids total de ladite composition, d'un copolymère d'éthylène et d'acétate de vinyle où le rapport pondéral de l'éthylène à l'acétate de vinyle vaut de 2,2/1 à 24/1 et dont l'indice de fluidité à chaud vaut de 0,2 à 10 g/10 min.
  20. Film conforme à la revendication 19, dans lequel la quantité du copolymère d'éthylène et d'acétate de vinyle représente de 5 à 85 % du poids total de ladite composition.
  21. Film conforme à la revendication 19, dans lequel la quantité du copolymère d'éthylène et d'acétate de vinyle représente de 5 à 25 % du poids total de ladite composition.
  22. Film conforme à la revendication 19, dans lequel la résistance à l'état fondu de la composition de polymères vaut de 10 à 70 cN.
  23. Procédé de fabrication d'une poche contenant une matière coulante, qui comporte le fait de former une structure en film par extrusion-soufflage de tube ou par extrusion en filière plate, le fait de faire un élément tubulaire de cette structure en film, et le fait de sceller à chaud, transver-salement, les extrémités opposées de cet élément tubulaire, lequel élément tubulaire comprend une structure en film pour poche, comportant au moins une couche à scellage en une composition de polymères comprenant :
    a) de 10 à 100 %, par rapport au poids total de ladite composition, d'un mélange
    1) de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un copolymère linéaire d'éthylène, interpolymère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et présentant une masse volumique de 0,916 à 0,940 g/cm3, un indice de fluidité à chaud inférieur à 10 g/10 min, un rapport Mw/Mn, indice de distribution des masses moléculaires, supérieur à 4,0 et un point de fusion (pic en analyse enthalpique différentielle) supérieur à 100 °C,
    2) et de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un polyéthylène basse densité haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3, un indice de fluidité à chaud inférieur à 1 g/10 min et une résistance à l'état fondu, mesurée à 190 °C au moyen d'un appareil Goettfert Rheotens, supérieure à 10 cN,
    b) et de 0 à 90 %, par rapport au poids total de ladite composition, d'au moins un copolymère choisi dans l'ensemble constitué d'un copolymère d'éthylène et d'acétate de vinyle où le rapport pondéral de l'éthylène à l'acétate de vinyle vaut de 2,2/1 à 24/1 et dont l'indice de fluidité à chaud vaut de 0,2 à 10 g/10 min.
  24. Procédé de fabrication d'une poche contenant une matière coulante, qui comporte le fait de former une structure en film par extrusion-soufflage de tube ou par extrusion en filière plate, le fait de faire un élément tubulaire de cette structure en film, et le fait de sceller à chaud, transver-salement, les extrémités opposées de cet élément tubulaire, lequel élément tubulaire comprend :
    I) une couche d'une composition de polymères comprenant :
    a) de 10 à 100 %, par rapport au poids total de ladite composition, d'un mélange
    1) de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un copolymère linéaire d'éthylène, interpolymère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et présentant une masse volumique de 0,916 à 0,940 g/cm3, un indice de fluidité à chaud inférieur à 10 g/10 min, un rapport Mw/Mn, indice de distribution des masses moléculaires, supérieur à 4,0 et un point de fusion (pic en analyse enthalpique différentielle) supérieur à 100 °C,
    2) et de 5 à 95 % en poids, pour 100 parties en poids dudit mélange, d'un polyéthylène basse densité haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3, un indice de fluidité à chaud inférieur à 1 g/10 min et une résistance à l'état fondu, mesurée à 190 °C au moyen d'un appareil Goettfert Rheotens, supérieure à 10 cN,
    b) et de 0 à 90 %, par rapport au poids total de ladite composition, d'au moins un copolymère choisi dans l'ensemble constitué d'un copolymère d'éthylène et d'acétate de vinyle où le rapport pondéral de l'éthylène à l'acétate de vinyle vaut de 2,2/1 à 24/1 et dont l'in-dice de fluidité à chaud vaut de 0,2 à 10 g/10 min ;
    II) et au moins une couche d'un copolymère linéaire d'éthylène, interpoly-mère formé d'éthylène et d'au moins une alpha-oléfine en C3-18 et pré-sentant une masse volumique de 0,916 à 0,940 g/cm3 et un indice de fluidité à chaud de 0,1 à 10 g/10 min.
  25. Procédé conforme à la revendication 24, dans lequel la struc-ture en film comporte en outre :
    III) au moins une couche d'un polyéthylène haute pression, présentant une masse volumique de 0,916 à 0,930 g/cm3 et un indice de fluidité à chaud de 0,1 à 10 g/10 min.
EP97905720A 1997-02-11 1997-02-11 Sachets destines a emballer des matieres fluides Expired - Lifetime EP0998388B9 (fr)

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KR100700482B1 (ko) * 2000-06-19 2007-03-28 소른톤 트러스티 컴퍼니 리미티드 유동성 물질을 담기 위한 용기
GB0023548D0 (en) * 2000-09-26 2000-11-08 Elopak Systems A film
CA2592833A1 (fr) * 2005-01-03 2006-07-13 Dow Global Technologies Inc. Compositions de resine elastomere avec une meilleure resistance a l'ecoulement pulse
BRPI0710771A2 (pt) 2006-04-26 2011-06-07 Liqui Box Canada Inc pelìculas de polietileno de baixa densidade resistentes ao craqueamento por flexão
CN102020056B (zh) * 2009-09-21 2012-11-07 刘建林 多层共挤可降低漏包率的液体包装膜
ES2380568T3 (es) 2009-11-10 2012-05-16 Basell Polyolefine Gmbh LDPE de alta presión, para aplicaciones médicas
US8978346B2 (en) 2010-04-16 2015-03-17 Liqui-Box Corporation Multi-layer, ethylene polymer-based films with high-density polyethylene based stiffening layer
WO2011130467A2 (fr) 2010-04-16 2011-10-20 Liqui-Box Corporation Films multicouches à base d'un polymère d'éthylène comprenant une couche solidifiante à base de polypropylène
US9283736B2 (en) 2010-04-16 2016-03-15 Liqui-Box Corporation Multi-layer, ethylene polymer-based films with novel polypropylene blend-based stiffening layer
CN102729563B (zh) * 2012-06-01 2015-01-07 朝阳佛瑞达科技有限公司 具有纸感外观易降解的uht液态奶高阻隔包装膜
CN103819806A (zh) * 2014-02-17 2014-05-28 上海福助工业有限公司 纯pe单层塑料薄膜、由其制备的棱角包装袋及其生产方法
WO2019099348A2 (fr) 2017-11-14 2019-05-23 Liqui-Box Corporation Conteneurs souples aseptiques résistant à la fissuration par flexion et résistant à la chaleur pour emballage souple
CN110157074A (zh) * 2019-05-30 2019-08-23 厦门市杏林意美包装有限公司 一种易撕pe膜材料及其制备方法和应用
CN111661472A (zh) * 2020-05-14 2020-09-15 慈溪市和达塑料制品有限公司 平底封装垃圾袋及其制造方法

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AU565262B2 (en) 1982-06-02 1987-09-10 Du Pont Canada Inc. Pouches of copolymer film
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US5344884A (en) * 1992-10-08 1994-09-06 Phillips Petroleum Company Polyethylene blends
US5360648A (en) * 1993-06-24 1994-11-01 The Dow Chemical Company Pouch for packaging flowable materials

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DE69737571T2 (de) 2007-12-20
EP0998388A4 (fr) 2000-05-10
DE69737571D1 (de) 2007-05-16
CN1246099A (zh) 2000-03-01
JP2001512402A (ja) 2001-08-21
WO1998034844A1 (fr) 1998-08-13
CA2280910C (fr) 2004-06-22
EP0998388A1 (fr) 2000-05-10
ES2284182T3 (es) 2007-11-01
AU742162B2 (en) 2001-12-20
CA2280910A1 (fr) 1998-08-13
AU2254797A (en) 1998-08-26
EP0998388B9 (fr) 2007-10-03

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