EP2394815A1 - Récipient en carton pour emballer des liquides et son procédé de fabrication - Google Patents

Récipient en carton pour emballer des liquides et son procédé de fabrication Download PDF

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Publication number
EP2394815A1
EP2394815A1 EP10425191A EP10425191A EP2394815A1 EP 2394815 A1 EP2394815 A1 EP 2394815A1 EP 10425191 A EP10425191 A EP 10425191A EP 10425191 A EP10425191 A EP 10425191A EP 2394815 A1 EP2394815 A1 EP 2394815A1
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Prior art keywords
polymer
paperboard container
container
paperboard
styrene
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Application number
EP10425191A
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German (de)
English (en)
Inventor
Gian Paolo Costanza
Marco Lariccia
Simone Freguglia
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Farbotex SpA
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Farbotex SpA
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Publication date
Application filed by Farbotex SpA filed Critical Farbotex SpA
Priority to EP10425191A priority Critical patent/EP2394815A1/fr
Publication of EP2394815A1 publication Critical patent/EP2394815A1/fr
Withdrawn legal-status Critical Current

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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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/02—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body
    • B65D5/06—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body with end-closing or contents-supporting elements formed by folding inwardly a wall extending from, and continuously around, an end of the tubular body
    • B65D5/067—Gable-top containers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

Definitions

  • the present invention relates to a paperboard container for packaging liquids comprising a polymer which is able to confer the container a high tightness and high mechanical strength, and to a process for the manufacture thereof.
  • Paperboard containers for packaging liquid substances have been known for a long time.
  • the paper is combined with very thin films of polymers which are mostly of synthetic origin.
  • the polyethylene-lined paperboard is made by combining polyethylene with at least one surface of the paperboard.
  • the polyethylene lines the inner surface of the container.
  • Polyethylene is a thermoplastic resin which may be easily heat-welded, thus avoiding the use of glues and adhesives for manufacture of the container.
  • the outer surface of the container is lined with ethylene vinyl alcohol (EVOH), a resin which is characterized by a high permeability in respect of the inks used for printing of the packaging.
  • EVOH ethylene vinyl alcohol
  • an aluminium foil may be interposed between the paper layer and the inner layer of polyethylene which form the container, in order to protect the contents from light and air which may alter the chemical and physical properties of the alimentary product.
  • the patent WO 99/08939 describes a paperboard container obtained using a smaller quantity of material compared to known containers.
  • the patent WO 96/16877 describes the use of a barrier layer which is chemically grafted onto the stiffening layer of the paperboard container.
  • This barrier layer may be made of polyamide, polyvinyl alcohol or polyvinylidene chloride.
  • US patent No. 4,206,249 describes a process for producing a paperboard container having a high impermeability in respect of liquids, comprising the steps of (i) applying a solution containing at least one pre-polymer (hot melt) and a photosensitive component, both on the inner surface and on the outer surface of the container, and (ii) irradiating the coated surface with ultraviolet light in order to induce polymerization of the pre-polymer, thereby forming a liquid-impermeable coating.
  • Step (i) is performed by means of air-free spraying of the solution containing the hot melt.
  • the solution used in step (i) has a viscosity of at least 20 poises, at room temperature, and less than 100 centipoises, after heating.
  • the technique of applying a hot melt by means of spraying is the most commonly used technique and may be performed, for example, using spiral or gun-type sprayers.
  • Other hot-melt application techniques comprise, for example, systems involving application by means of hot rotors, flat dies, spreading, the drip process and devices for dispersing powders which are subsequently melted.
  • the sheets of polyethylene-lined paperboard are shaped until they acquire the desired form. Then the zones of the container which come into contact with each other, on the bottom of the container, are heat-welded by means of melting of the polyethylene layer which lines the inner of the container.
  • the liquid may escape from the container via these not perfectly heat-welded points and/or penetrate into the structure of the polyethylene-lined paperboard, causing leakages and/or seeping of the liquid through the bottom of the container and, by means of capillarity, within the walls of the container.
  • the present invention therefore relates to a paperboard container for packaging liquids, comprising a polyethylene-lined paperboard structure, characterized in that the inner surface of said paperboard container is coated with a layer of at least one polymer chosen from the group consisting of ethylene vinyl acetate (EVA) copolymers; styrene-butadiene-styrene/styrene-isoprene-styrene (SBS-SIS) copolymers; metallocene polyolefin polymers and copolymers; and mixtures thereof with polyolefins.
  • EVA ethylene vinyl acetate
  • SBS-SIS styrene-butadiene-styrene/styrene-isoprene-styrene copolymers
  • metallocene polyolefin polymers and copolymers and mixtures thereof with polyolefins.
  • said layer of at least one polymer covers the inner surface of the bottom of said paperboard container and is applied after closing and welding said bottom.
  • said layer of at least one polymer covers the welding zones of the bottom of said paperboard container.
  • Said welding zones correspond to the portions of the paperboard container which are welded together in order to close the bottom of said container.
  • the Applicant has also developed a process for improving the tightness of the container and for ensuring a mechanical strength of the container superior to that provided by the containers at present commercially available.
  • the present invention relates to a process for manufacturing a paperboard container for packaging liquids, comprising a polyethylene-lined paperboard structure, characterized by a step of applying to the inner surface of said paperboard container at least one polymer chosen from the group consisting of ethylene vinyl acetate (EVA) copolymers; styrene-butadiene-styrene/styrene-isoprene-styrene (SBS-SIS) copolymers; metallocene polyolefin polymers and copolymers; polyolefins; and mixtures thereof.
  • EVA ethylene vinyl acetate
  • SBS-SIS styrene-butadiene-styrene/styrene-isoprene-styrene copolymers
  • metallocene polyolefin polymers and copolymers polyolefins; and mixtures thereof.
  • the polymer must have a good chemical resistance to aqueous dispersions/emulsions/solutions which have a neutral, strongly acidic and strongly alkaline pH value.
  • the polymer must not contain organic solvents, in order to avoid both costly removal operations before and during use in the industrial process, and deterioration and/or contamination of the container and its contents.
  • the polymer must adhere perfectly and stably to the material which forms the inner surface of the container, without however causing deterioration thereof.
  • the polymer must have a flexibility comparable to that of the material onto which its is applied.
  • the Applicant has also found that the polymer used according to the present invention must satisfy certain requirements related to the industrial process.
  • the polymer used must be stable and able to be easily applied to the operating conditions of the continuous process.
  • the polymer must has a viscosity at the operating temperature which is compatible with the applicational parameters of the machine used.
  • the present invention therefore relates to a paperboard container comprising a polyethylene-lined paperboard structure, characterized in that the inner surface of said paperboard container is coated with a layer of at least one polymer chosen from the group consisting of ethylene vinyl acetate (EVA) copolymers; styrene-butadienestyrene/styrene-isoprene-styrene (SBS-SIS) copolymers; metallocene polyolefin polymers and copolymers; and mixtures thereof with polyolefins.
  • EVA ethylene vinyl acetate
  • SBS-SIS styrene-butadienestyrene/styrene-isoprene-styrene copolymers
  • metallocene polyolefin polymers and copolymers and mixtures thereof with polyolefins.
  • said layer of at least one polymer is applied onto the bottom of said paperboard container and even more preferably at least along and around the welding zones of the bottom of said paperboard container.
  • Said welding zones correspond to the portions of the paperboard container which are welded together in order to close the bottom of said container.
  • said polymer is applied after welding the bottom of said paperboard container.
  • said polymer is solid at room temperature.
  • said polymer has a softening point higher than 40°C and more preferably between 70°C and 200°C.
  • said polymer is insoluble in water and is elastic, namely has the capacity to be deformed without breaking when subjected to compression and/or mechanical stressing and to return to its original form when said stressing ceases.
  • said polymer has a viscosity, measured between 100°C and 180°C, of between 250 and 1800 cPs, more preferably between 400 and 1000 cPs.
  • said polymer is an ethylene vinyl acetate (EVA) copolymer.
  • EVA ethylene vinyl acetate
  • said polymer is a styrene-butadienestyrene/styrene-isoprene-styrene (SBS-SIS) copolymer;
  • said ethylene vinyl acetate (EVA) copolymer contains vinyl acetate monomers in a percentage amount of between 5% and 40% by weight.
  • said EVA has an average molecular weight of between 15,000 and 50,000 Daltons.
  • said EVA has a polydispersity index of at least 6, more preferably of between 7 and 20, said polydispersity index being defined as the weight ratio between the weight average molecular weight and the numeral average molecular weight of said polymer.
  • EVA polymers which can be used according to the present invention, are the products Icamelt TM 1915 - supplied by the company ICAT (Italy), 99S TM - supplied by the company Savarè (Italy), Termomelt TM C747 - supplied by the company Leunberger +C (Crema - Italy).
  • SBS-SIS styrene-butadiene-styrene/styrene-isoprene-styrene copolymer
  • SBS-SIS styrene-butadiene-styrene/styrene-isoprene-styrene copolymer
  • said SBS-SIS has an average molecular weight of between 2,000 and 300,000 Daltons.
  • SBS-SIS copolymer examples of an SBS-SIS copolymer, which can be used according to the present invention, is the product ET032S TM - supplied by the company Savarè (Italy).
  • the metallocene polyolefin polymers and copolymers include, as is well-known in the art, polymerized polyolefin polymers and copolymers using a metallocene catalyst.
  • metallocene polyolefin polymers and copolymers which can be used according to the present invention, are the products Plastomelt TM Excelta LM1; Plastoflex TM CW MV and Plastoflex TM HS 8741, supplied by the company PARAMELT (Holland).
  • the paperboard container 1 comprises a plurality of lateral elements 21-24 and a sealing element 25.
  • Each element 21-25 is divided from a corresponding top element 31-35 by a first horizontal folding line 55. Moreover, each element 21-25 is divided from a corresponding bottom element 41-45 by a second horizontal folding line 56. The individual lateral elements 21-25, top elements 31-35 and bottom elements 41-45 are further divided by vertical folding lines 50-53. Tabs 61-67 are situated at the end of said top elements 31-35 and are divided from said top elements 31-35 by a third horizontal folding line 57. A tab 70 is present next to at least one bottom element.
  • One of the top elements 31-34 is provided with an opening 75 which indicates the area in which the container closure (not shown in Figure 1 ) will be positioned.
  • said opening is formed in the element 33 and has a circular shape.
  • bottom and top refer to the unfolded view as shown in Figure 1 and to the containers as shown in Figures 2 and 3 .
  • the open container 2 comprises a bottom 46 which is formed during a preliminary step in the process for manufacture of the paperboard container.
  • the bottom elements 41-45 and the tab 70 are automatically folded, during a folding step, so as to create zones of contact between said elements 41-45 and said tab 70.
  • welding zones are formed on the bottom of the container, corresponding to said contact zones.
  • Said bottom 46 may have a square, rectangular or other flat shape.
  • said bottom 46 has a square shape.
  • Said welding zones correspond to the portions of the paperboard container which are welded together in order to close the bottom 46 of said container and more particularly correspond to the diagonals 47 and 48 which define the bottom of said container.
  • said welding zones are formed by means of heat-welding, in particular by means of plates which are heated (to 180°C - 380°C) and which melt the inner polyethylene lining.
  • the container 2 as shown in Figure 2 , is closed at the bottom and opened at the top.
  • the container 3, according to the present invention is sealed by means of a packaging machine.
  • the paperboard container 3 comprises a top part 36 which is formed by folding the top elements 31-35 and which is provided with an opening 75 which indicates the area in which the container closure (not shown in Figure 2 ) will be positioned.
  • Said top part 36 terminates at the top end in a zone 37 obtained by sealing the tabs 61-67.
  • the container 3 also comprises a bottom 46 formed during a preliminary step by folding and sealing the bottom elements 41-45 together.
  • the present invention also relates to a process for manufacturing a paperboard container comprising a polyethylene-lined paperboard structure, said process comprising the steps of:
  • said polymer is applied onto the bottom of said paperboard container and even more preferably said polymer is applied at least along and around the welding zones on the bottom of said paperboard container.
  • said polymer is applied by means of spray or atomization of at least one liquefied polymer. More preferably, said polymer is applied by means of spray of at least one liquefied polymer.
  • said spray of a liquefied polymer is performed at a temperature of the polymer of between 50°C and 300°C and more preferably at a temperature of 180°C.
  • said spray of a liquefied polymer is performed at a pressure of between 5 and 60 bar and more preferably between 20 and 40 bar.
  • said spray of a liquefied polymer is performed via a nozzle comprising 1 to 10 spray channels.
  • said nozzle comprises one channel and the polymer is applied by means of at least five spray, said spraybeing performed during the continuous industrial manufacturing process in a single station or in five successive stations.
  • said nozzle comprises five channels and the polymer is applied by means of a single spray performed in a single station during the continuous industrial production process.
  • said nozzle comprising five channels is designed so as to have a central channel and four lateral channels arranged symmetrically with respect to the central channel.
  • said central channel is perpendicular to the resting plane of the container.
  • said lateral channels are arranged so that the spray angle is between 1° and 45° relative to the vertical and more preferably is between 5° and 20° relative to the vertical.
  • the spray angle is 8° relative to the vertical.
  • said five channels are formed so as to direct the spray of liquefied polymer respectively towards the point of intersection of the diagonals crossing the bottom of the container and near to the four corners of the container bottom.
  • each of said five channels has a diameter of between 0.1 and 5 mm and more preferably of 0.5 mm.
  • the spray time of said polymer is between 0.05 and 0.50 seconds and more preferably is equal to or less than 0.2 seconds.
  • said spray time is between 0.10 and 0.15 seconds.
  • said spray of a liquefied polymer is performed at a height of between 1 and 60 cm and more preferably at about 30 cm from the bottom.
  • said spray of a liquefied polymer is followed by a step involving blowing of pressurized air, said blowing step having the aim of spreading the polymer on the bottom of the container.
  • said blowing of pressurized air is performed at a temperature of the air of between 5°C and 200°C, preferably between 10°C and 170°C, and even more preferably at a temperature of between 20°C and 130°C.
  • said blowing of pressurized air is performed at a pressure of between 0.1 and 10 bar and more preferably between 1 and 6 bar.
  • said blowing of pressurized air is performed by means of a gun comprising a nozzle having from 1 to 10 channels and more preferably having five channels.
  • the blowing angle of said channels is between 1° and 45° relative to the vertical and more preferably is 43° relative to the vertical.
  • each of said five channels has a diameter of between 0.1 and 5.0 mm and more preferably of 2.0 mm.
  • the pressurized air blowing time is between 0.1 and 5.0 seconds and more preferably is between 1.0 and 1.5 seconds.
  • the overall time for spray of the liquefied polymer and blowing of the pressurized air is between 1 and 5 seconds and more preferably is between 2 and 4 seconds.
  • said blowing of pressurized air is performed at a height of between 1 and 60 cm and more preferably is performed at about 3 cm from the bottom.
  • the welding performed during steps (a) and (c) is performed by means of heat-welding using heating plates.
  • said heating plates have a temperature of between 200° and 380°C and preferably of about 280°C.
  • the duration of contact between said heating plates and the bottom of the paperboard container 2 is between 0.5 and 8 seconds and preferably between 2 and 4 seconds.
  • said manufacturing process comprises a step involving sterilization of said open paperboard container 2.
  • polymers 1-18 have been considered. All these polymers are inert in relation to the polyethylene which lines the inner surface of the paperboard container and may be applied at a temperature lower than the melting point of the polyethylene.
  • the polymers 1-18 were heated to a temperature higher than the respective melting points, but lower than their decomposition temperatures, until a homogeneous liquid was obtained. In the case where the polymer consisted of a mixture of different materials, their compatibility was verified, checking at the above-mentioned temperatures for the possible presence of separate phases.
  • Table 1 the viscosity has been evaluated for each polymer at the application temperature.
  • the polymers 1, 2, 3, 5, 8, 13 and 18 did not have suitable application properties.
  • the polymers 1, 2, 5, 8, 13 and 18 did not possess good elasticity; in other words they were not flexible enough in relation to the open sheet of polyethylene-lined paperboard and/or did not adhere perfectly to said sheet.
  • the polymers 4, 6, 7, 9-12 and 14-17 instead, had both a good elasticity, namely a flexibility comparable to that of the open sheet of polyethylene-lined paperboard and a good adhesion to said sheet. These polymers were subjected to chemical resistance tests.
  • Test B Tests for resistance to chemical agents
  • the untreated containers model Gable Top 1000 ml, used in the following examples, were provided by Italpack Cartons (Avellino). These containers have a square base with a side dimension 72 mm, height of 236 mm and thickness of 0.5 mm.
  • the internal lining consists of polyethylene and the external lining consists of EVOH.
  • These containers were packaged using the packaging machine RG21 UCS, series B-style, produced by GALDI (Treviso).
  • Test B-1 comparative test with ethanol
  • ethanol was a suitable comparison product which could rapidly highlight the tightness defects of a paperboard container in critical conditions
  • two untreated containers with welding defects were filled with a mixture of ethanol and a dye (Basic Yellow 29), which has the specific and sole function of a tracer, and were stored under different conditions.
  • the first container was stored at room temperature (20°) and the second container was stored in an oven at a constant temperature of 50°C in order to amplify the soaking power of ethanol and to further reduce the tightness time.
  • the evaluation was carried out repeatedly by means of a visual inspection at 1-hour intervals, checking to see whether there were any collapsed points on the outer surface of the containers and in particular on the bottom of the container.
  • the impermeability time was very brief: in the case of the first container, stored at room temperature (20°C), it was 12 hours and, in the case of the second container, stored at 50°C, it was only 2 hours.
  • impermeability time is understood as meaning the time which lapses from the start of the test to the appearance of the first signs of leakage of the liquid highlighted by the dye.
  • the aim of this test was to evaluate the resistance to chemical agents of varying types and check which mixture, from among those tested, was the most aggressive one for use in the subsequent tests, so that an indication of the effective degradation of the polymers could be obtained within a short space of time.
  • the test was carried out using untreated paperboard containers with welding defects, introducing the following complex mixtures (in the form of an aqueous solution/dispersion/emulsion) directly into the containers.
  • the paperboard containers, filled with each of the above mixtures, were stored in an oven at a constant temperature of 50°C. As already described above, this high temperature amplifies the soaking power of the mixtures, reducing the tightness time.
  • Test C Tests for resistance to chemical agents
  • a sheet of polyethylene-lined paperboard yet to be folded was arranged in the form of a bowl able to receive the liquid products. Small holes were then made in the base of the polyethylene-lined paperboard with a needle.
  • the polymers selected during the preceding test A (polymers 4, 6, 7, 9-12 and 14-17) were applied inside these containers, ensuring that the perforated parts were covered, and then filled with ethanol and with mixtures 1 to 6 (used during the comparison test B-2). The test was duplicated for each polymer.
  • the containers thus prepared were stored in an oven at a constant temperature of 50°C and inspected after 24 hours.
  • Table 3 shows the maximum number of storage days without signs of defects (for example, leakages and/or softening) in the containers.
  • Table 3 Number of days stored in oven at 50°C Polymer Ethanol Mix1 Mix 2 Mix 3 Mix 4 Mix 5 Mix 6 4 5 30 30 15 30 30 30 6 30 30 30 30 30 30 30 7 5 30 30 15 30 30 30 9 5 30 30 15 30 30 30 10 5 30 30 15 30 30 30 30 11 5 30 30 15 30 30 30 12 5 30 30 15 30 30 30 30 14 5 30 30 15 30 30 30 30 15 30 30 30 30 30 30 30 30 30 30 16 5 30 30 15 30 30 30 17 5 30 30 15 30 30 30 30 30 30 30.
  • the machine for applying these polymers was chosen from the machines produced by the company PREO (Corsico, Milan).
  • the machine used (EASY 10KG, SERIES W, GEAR PUMP, supplied by the company PREO) had a melting section where the polymer is liquefied by means of heating (operating temperature between 50° and 230°C), a pump for spray the liquefied polymer (maximum operating pressure 60 bar) and a gun (gun, series NEW LIFE) for performing spray, controlled by an electric valve. Moreover, the following parameters had to be observed during application of the polymer:
  • the polymer 15 used in Test A was chosen on the basis of both its chemical and physical properties and the results obtained in Test C.
  • the polymer spray height understood as being the distance between the end of the nozzle and the bottom of the container, was kept at 30 cm and the quantity of sprayed polymer was always equivalent to 3.0 grammes.
  • the polymer was sprayed through the nozzle and the air blown at high pressure using a gun.
  • test (m) the machine used was prepared with an air blowing station situated after the polymer spray station.
  • the gun which had a nozzle with 5 channels, diameter of 2.0 mm and blowing angle of 43°, was inserted down to a height of about 3 cm from the bottom of the container.
  • the air spray height was kept at 3 cm.
  • Test (e) produced an unsatisfactory result since the polymer did not spread in a uniform manner, probably because, within the closed containers, there was turbulence in the air which affected the linear travel of the latter in relation to the polymer.
  • test f Even when the polymer and air spray mode was changed (test f) a satisfactory result was not achieved since the air, not being sufficiently hot, caused rapid solidification of the polymer which consequently did not adhere to the bottom of the container. Moreover, after spraying, solid filaments were present on the walls of the container.
  • Test (g) was conducted using a nozzle with four channels directed along the corners of the container bottom (inclination of 9° relative to the vertical). The result was not satisfactory both because, without air, the polymer was not suitably spread and because the point of intersection of the diagonals on the container bottom was untreated and consequently tightness was not ensured.
  • Test (h) was conducted increasing the air blowing pressure up to 6.0 bar. In this case the polymer was spread properly, but a single polymer spray was still insufficient to cover the critical points on the bottom of the container.
  • Test (i) was therefore conducted using a nozzle with one channel, but spraying the polymer five times at the desired points, namely at the points where diagonals on the bottom of the container intersect and in the corners of the container bottom. Despite the fact that the pressure of the air was less than 2.0 bar, the result was satisfactory because the five spray were aimed at the critical points on the container bottom.
  • test I a nozzle with five channels was developed (test I), this nozzle being characterized by a specific geometry which allowed spray of the liquefied polymer in a single spray in the five desired positions.
  • said nozzle had five channels, one of which was perpendicular to the point of intersection of the diagonals on the bottom of the container and the other four of which were directed along the diagonals into the vicinity of the corners of the bottom of said container.
  • Each of these four channels had an angle of 8° relative to the perpendicular channel.
  • the five channels each had a diameter of 0.5 mm. The application operation produced positive results.
  • test (m) was conducted using the same nozzle as in test (I), but with air being blown after the polymer spraying step, at a pressure of 6.0 bar and at a temperature of 20° C. The application operation produced positive results.
  • Test F Stability tests for paperboard containers with simulation of a packaging defect
  • the containers indicated below were all manufactured using a temperature of 250°C for heat-welding the bottom of the container. This temperature is lower than the temperature normally used (300° C) and simulates a situation which could actually occur during the continuous industrial process, with consequent defects in the tightness of the containers.
  • the containers were stored at 50°C and the tests were conducted in triplicate. Evaluation was carried out by means of a visual inspection, if necessary with the test being voluntarily interrupted after 6 months.
  • Table 7 shows the impermeability time values recorded for the untreated containers and the containers treated using the procedure (m) of Test D.
  • Table 7 Contents Impermeability time of untreated containers* Impermeability time of treated containers Mixture 1 240 minutes 6 months Mixture 2 120 minutes 6 months Mixture 3 60 minutes 6 months Mixture 4 180 minutes 6 months Mixture 5 180 minutes 6 months Mixture 6 120 minutes 6 months (*) comparison

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EP10425191A 2010-06-08 2010-06-08 Récipient en carton pour emballer des liquides et son procédé de fabrication Withdrawn EP2394815A1 (fr)

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EP10425191A EP2394815A1 (fr) 2010-06-08 2010-06-08 Récipient en carton pour emballer des liquides et son procédé de fabrication

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EP10425191A EP2394815A1 (fr) 2010-06-08 2010-06-08 Récipient en carton pour emballer des liquides et son procédé de fabrication

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3015372A1 (fr) * 2013-06-29 2016-05-04 Tetra Laval Holdings & Finance SA Dispositif d'emballage et de remplissage, récipient en papier et découpe

Citations (8)

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JPH08337237A (ja) * 1995-06-13 1996-12-24 Toppan Printing Co Ltd 液体用紙容器
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JP2004149179A (ja) * 2002-10-31 2004-05-27 Nihon Tetra Pak Kk 紙容器用積層体
JP2007112483A (ja) * 2005-10-20 2007-05-10 Dainippon Printing Co Ltd 紙容器
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JPH08337237A (ja) * 1995-06-13 1996-12-24 Toppan Printing Co Ltd 液体用紙容器
WO1999008939A1 (fr) 1997-08-14 1999-02-25 Tetra Laval Holdings & Finance S.A. Boite en carton a partie superieure tetraedrique
JP2004149179A (ja) * 2002-10-31 2004-05-27 Nihon Tetra Pak Kk 紙容器用積層体
JP2007112483A (ja) * 2005-10-20 2007-05-10 Dainippon Printing Co Ltd 紙容器
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3015372A1 (fr) * 2013-06-29 2016-05-04 Tetra Laval Holdings & Finance SA Dispositif d'emballage et de remplissage, récipient en papier et découpe
EP3015372A4 (fr) * 2013-06-29 2017-05-03 Tetra Laval Holdings & Finance SA Dispositif d'emballage et de remplissage, récipient en papier et découpe

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