EP2167390B1 - Verfahren zur Heißabfüllung von Kunststoffbehälter - Google Patents

Verfahren zur Heißabfüllung von Kunststoffbehälter Download PDF

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Publication number
EP2167390B1
EP2167390B1 EP08776552.5A EP08776552A EP2167390B1 EP 2167390 B1 EP2167390 B1 EP 2167390B1 EP 08776552 A EP08776552 A EP 08776552A EP 2167390 B1 EP2167390 B1 EP 2167390B1
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EP
European Patent Office
Prior art keywords
package
packaging
temperature
expansion
filling
Prior art date
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Active
Application number
EP08776552.5A
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English (en)
French (fr)
Other versions
EP2167390A2 (de
Inventor
Jacques Thomasset
Joachim Pellissier
Stéphane MATHIEU
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.)
Aisapack Holding SA
Original Assignee
Aisapack Holding SA
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 Aisapack Holding SA filed Critical Aisapack Holding SA
Priority to EP08776552.5A priority Critical patent/EP2167390B1/de
Publication of EP2167390A2 publication Critical patent/EP2167390A2/de
Application granted granted Critical
Publication of EP2167390B1 publication Critical patent/EP2167390B1/de
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Classifications

    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • 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
    • B65D11/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material
    • B65D11/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material of curved cross-section
    • B65D11/04—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • 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
    • B65D11/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material
    • B65D11/20—Details of walls made of plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/04—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus without applying pressure
    • B67C3/045—Apparatus specially adapted for filling bottles with hot liquids

Definitions

  • the invention relates to a process for filling plastic packaging for liquid or viscous products.
  • It relates more specifically to a process for filling packaging whose contents can undergo temperature variations of several tens of degrees.
  • the invention is particularly in the field of hot-fill packaging (greater than 70 ° C), and conditioning by heat treatment (pasteurization).
  • PET Polyethylene terephthalate
  • Thermoplating is considered to be the most efficient method for improving the heat resistance of bi-oriented PET bottles.
  • the principle of this process widely used on the market, is to heat treat the walls of the bottle to increase crystallization and thus improve the molecular stability at high temperature.
  • This principle can be broken down into several methods and thermo-fixing devices described in the prior art.
  • An important advantage of thermo-fixing processes is not to modify the packaging processes, the thermo-fixing of the bottle being performed during the manufacture of said bottle.
  • bottles having undergone a heat treatment to allow the conditioning of a liquid at high temperature have several disadvantages.
  • a first drawback of these bottles lies in the fact that only specific grades of polyethylene terephthalate can be used. These specific grades are more difficult to produce and generate additional packaging costs.
  • a second disadvantage is related to the decrease in the production rate of the bottles because the thermo-fixing process slows down the blowing cycle.
  • a third drawback is related to the weight of these bottles.
  • a bottle When a bottle is filled with a hot liquid, it results after cooling a negative pressure inside the bottle; said negative pressure having the effect of randomly deforming the walls of the bottle.
  • the most common method for dealing with the negative pressure in the bottle is the addition of compensation panels that allow the bottle to be deformed in a controlled manner.
  • bottles with compensation panels are stiffer and therefore heavier. This results in an excess of material which is not strictly necessary for the good conservation of the product.
  • the compensation panels are detrimental to the aesthetics of the packaging, which makes it less attractive to the consumer.
  • Soft bags are also commonly used for packaging liquid products. These pockets are made from pre-printed thin films. These packages offer many benefits including weight, cost and compaction before and after use.
  • the packaged liquid is heated, voluntarily or involuntarily (such as staying inside a car exposed to the sun), the product expands, sometimes so that the packaging can burst.
  • the invention overcomes the aforementioned drawbacks. It relates to a hot-filling method according to claim 1 which uses a package which, when subjected to a temperature change, expands and retracts together with the packaged product.
  • This method has many advantages when used for packaging a product at high temperature. Unlike processes with PET bottles, this process does not require a heat-setting process to avoid shrinkage of the walls under the effect of the filling temperature. Unlike processes with PET bottles, this process does not require compensation panels to cope with changes in product volume during cooling.
  • This process is characterized in that the thermal expansion of the package is greater than or equal to the thermal expansion of the product.
  • the temperature of the product heats the walls of the package that expand.
  • the expanded package is then sealed. Cooling, the package retracts and returns to its original geometry; after cooling, the result is a relative pressure in the package that is positive or zero.
  • a slight pressure in the package after cooling is advantageous because it improves the compressive strength of the package, and it also improves the grip of the package.
  • the use of the packaging in a packaging process requiring a thermal treatment of the packaging and its contents, such as the pasteurization process for example, is also particularly advantageous. During the temperature rise of the package and the product, the package expands at least as much as the product, which avoids excessive pressure buildup in the package.
  • Another advantage of the process according to the invention is that if the packaged product is subjected to an increase in temperature, then the package will expand together with the product and thus the walls, the bottom and the welds (in the case of packaging made using flexible films) of the packaging do not undergo or very little increase in pressure and therefore easily resist.
  • the invention is used for the packaging of liquid or viscous products.
  • the coefficient of expansion of the package used in the present invention is greater than or equal to the coefficient of expansion of the packaged product.
  • the coefficient of linear expansion of the walls of the package is generally greater than 0.00014 m / (m ° K).
  • the inventors use in the present invention a package which avoids the negative relative pressure in the package after hot filling.
  • the first embodiment of the invention is particularly advantageous because it avoids the deformation of the packaging during cooling.
  • the first embodiment of the invention is illustrated by the Figures 1 to 4 .
  • the figure 1 illustrates the provision of a package; said package 1 having a side wall 2, a neck 3 and a bottom 4; and said package being characterized by the expansion of its sidewalls under the effect of temperature.
  • the packaging is fed at low temperature, said low temperature preferably being ambient temperature (20 ° C.).
  • the package 1 can be cleaned, rinsed, dried before filling illustrated figure 2 . In order to simplify the disclosure of the invention, only the steps necessary for understanding the invention are explained.
  • the figure 2 represents the filling of a high temperature product in the package 1. Often, said high filling temperature is 85 ° C. Due to the high temperature of the product when poured into the package, the walls 2 of the package expand almost instantaneously. The expansion of the packaging is done as filling and depends on the filling level 6 which defines the limit of contact with the product 5 and the walls of the package. The expansion of the package is schematically illustrated by the variation in height 7. This thermal expansion of the walls 2 is generally manifested by a variation in height and diameter. At the end of the filling and before sealing, the result is a package whose volume is greater than the initial volume.
  • the figure 3 shows the hermetic closure of the package after filling, the product 5 being still at high temperature during said closing.
  • a plug 8 or other known closure means is applied to the neck 3 and ensures the hermetic closure.
  • a volume of gas 9 is trapped in the package at the time of closing. This volume of gas depends on the filling rate of the package. It is best to quickly close the packaging after filling to prevent this volume of gas from being too hot at the time of closing.
  • the gas 9 trapped in the headspace may be air, nitrogen or any other gas or gas mixture known to those skilled in the art.
  • package 1 and product 5 are at high temperature. The volume of the product 5 is therefore dilated, as are the walls of the package.
  • the figure 4 illustrates the packaging and its contents after cooling to storage temperature. Often the storage temperature is close to the ambient temperature. Under cooling, the packaging and its contents contracted.
  • a water-based liquid product for example, varies in volume by about 3% when its temperature varies between 85 and 20 ° C.
  • the packaging contracts under the effect of cooling; and its contraction is such that the relative pressure in the package after cooling is positive or zero; the contraction of the package is therefore greater than or equal to the contraction of the product.
  • a PET or HDPE packaging for example, is found in depression after cooling, the coefficient Expansion of these materials is insufficient to compensate for variations in the volume of the product.
  • a LDPE package exhibits thermal expansion properties that make it possible to avoid the negative relative pressure in the package after cooling. More generally, it has been found that the coefficient of linear thermal expansion of the package must be greater than 0.00014 m / (m ° K) and preferably greater than 0.00018 m / (m ° K). The lower the filling rate of the package, the higher the coefficient of expansion of the package.
  • the linear expansion of the package is not necessarily equal in all directions.
  • the linear expansion of the package in height may be greater than the circumferential expansion, or vice versa.
  • the geometry of the package after cooling and shrinking is generally identical to the geometry of the package before filling and expansion. However, it is observed in some cases a slight hysteresis, the contraction of the package being slightly less than its expansion. In this case, the final volume of the package is slightly larger than the initial volume. In other cases, the contraction of the package is slightly greater than its expansion; the final volume of the packaging is therefore lower than the initial volume. As a rule, the final geometry of the package is substantially identical to the initial geometry and the package can be expanded and retracted several times reversibly.
  • the cooling of the packaging has little influence, the cooling being able to be fast, slow, stepwise or continuous. Often spraying the packaging with water allows for rapid and efficient cooling.
  • the various cooling methods known to those skilled in the art can be used; only the initial and final temperatures of the package having an influence on the volume variation of said package.
  • packaging methods include filling the package with a product at a low temperature and then heat treating the package and its contents.
  • the second embodiment of the invention is particularly advantageous because it avoids excessive pressure in the packaging during heat treatment.
  • the Figures 5 to 7 illustrate the second embodiment of the invention.
  • the figure 5 illustrates the provision of a package; said package 1 having a side wall 2, a neck 3 and a bottom 4; and said package being characterized by the expansion of its sidewalls under the effect of temperature.
  • the package is filled with a liquid or viscous product 5 and hermetically closed by a cap 8.
  • the package and its contents are at low temperature, said low temperature preferably being the ambient temperature (20 ° C).
  • a volume of gas 9 which may be air is trapped at the headspace.
  • the filling rate of the package is illustrated by the liquid level 6.
  • a high filling ratio is favorable because the thermal expansion of the gases is greater than that of the liquids. It is preferable to have a filling rate of the package 1 greater than 90%.
  • the figure 6 illustrates the heat treatment step of raising the temperature of the package and its contents.
  • a heat treatment often used is for example, to immerse for 10 minutes, the package and its contents in a water bath at 80 ° C.
  • the heat treatment generates a gradual rise in temperature of the packaging and its contents, which creates the volume expansion of the product 5, and the volume of gas 9.
  • the packaging used in the context of the invention is characterized by a high thermal expansion of the walls 2 which avoids a high relative pressure in the package.
  • the difficulty encountered with packaging according to the state of the art is related to the fact that the high pressure in the package can create a reversal of the bottom 4. Often, a specific bottom design 4 is necessary to prevent the bottom sagging. . This stronger bottom is heavier and more expensive.
  • the invention makes it possible to overcome this difficulty; the expansion of the walls of the package during the heat treatment to prevent the build-up of pressure in the package.
  • the expansion of the walls of the package is illustrated by the variation of height 7.
  • the thermal expansion of the walls of the package is generally effected according to the height and circumference.
  • the expansion of the package is such that it compensates for variations in the volume of the product 5 and the gas 9.
  • the relative pressure in the package remains substantially constant and close to zero.
  • the figure 7 illustrates the package and its contents after cooling at low temperature, said low temperature being room temperature.
  • the final temperature after cooling is equivalent to the initial temperature before heat treatment. While cooling, the product 5 and the gas 9 contract.
  • Package 1 also contracts; this contraction being illustrated by the variation of height 10.
  • the value of the contraction of the package is identical to the value of the expansion 7.
  • the second embodiment of the invention is particularly advantageous because of the thin-walled packaging can be used. The inventors have found that a package having a coefficient of linear thermal expansion greater than 0.00016 m / (m ° K) makes it possible to limit the pressure during the heat treatment; and a coefficient greater than 0.00020 m / (m ° K) is particularly advantageous.
  • the packaging used in the invention is characterized by its thermal expansion and contraction properties. It has been found that the walls of the package must have a coefficient of linear thermal expansion greater than 0.00014 m / (m ° K) and preferably greater than 0.00018 m / (m ° K). Few materials used for packaging make it possible to obtain the abovementioned properties. The inventors have found that LDPE packages are particularly advantageous because of their expansion properties. Packaging obtained with certain grades of low crystalline PP make it possible to obtain sufficient dilatations; said grades of PP being preferably copolymers. It has been observed that bi-oriented packaging does not have a high coefficient of thermal expansion. Similarly a package made of a very crystalline polymer has a low coefficient of thermal expansion.
  • the packaging used in the present invention can be made by extrusion blow molding, by injection, by tubular extrusion, or by assembling from films.
  • the packages may be bottles or flasks made by extrusion blow molding, jars or cups made by molding, flexible bags made by welding from films.
  • the manufacturing process of the packaging may have a impact on the coefficient of expansion of the packaging. It is known in fact that extrusion processes orient more or less marked polymer chains. The orientation of the chains can create an anisotropy of properties resulting in expansion coefficients that differ in the direction of measurement. In order to simplify the disclosure of the invention, an average linear expansion coefficient identical in all directions is considered.
  • the coefficient of thermal expansion of the package can be measured by two methods.
  • One method is to measure the coefficient of volume expansion of the package by measuring the change in volume of the package as the temperature changes.
  • a second method consists in measuring the coefficient of linear expansion in two perpendicular directions by taking two long and narrow strips in said directions and measuring the variation in length of said strips as the temperature changes.
  • FIG 8 An exemplary embodiment of the packaging used in the present invention is illustrated figure 8 .
  • This package 1 comprises a tubular body 2 connected by welding to a neck 3 and a bottom 4.
  • a cap 8 fits on the neck 3 and allows the hermetic closure of the package.
  • the tubular body 2 forming the side walls can be extruded or formed from a film whose ends are connected by welding.
  • the film can be monolayer and multilayer.
  • the film does not have a rigid layer with a low coefficient of expansion, such as an aluminum layer or a bi-oriented polymer layer. It is observed that a thin layer of barrier-barrier polymer could be inserted into the multilayer structure.
  • a LDPE film containing a thin EVOH layer has thermal expansion properties greater than 0.00018 m / (m ° K).
  • the film multilayer may contain layers with a low coefficient of thermal expansion, if said layers are thin and do not block the expansion of said film.
  • Said film must contain at least 70% of a polymer having a coefficient of linear thermal expansion greater than 0.00014 m / (m ° K) and preferably greater than 0.00018 m / (m ° K).
  • the thickness of the EVOH layer should be less than 10% of the total thickness. If the thickness of the film is 300 microns, the thickness of the EVOH layer is less than 30 microns, and preferably less than 20 microns.
  • the neck and bottom provide rigidity and strength to the package and are composed of partially rigid elements with thicker wall. Such a package expands and contracts with the product during temperature variation through its side wall. The dimensions of the neck and bottom vary only slightly with the temperature.
  • the invention is not limited to the above examples for materials having an expansion coefficient greater than 0.00014m / (m ° K); said materials obtainable by polymer blending, by polymerization, by compounding or any other technique known to those skilled in the art.
  • Polyolefin blends, the addition of elastomers and the production of polyolefin-based alloys make it possible to adjust the coefficient of expansion of the package to that of the packaged product.
  • the multilayer structures also make it possible to modify the expansion properties of the walls of the packaging to those of the packaged product.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packages (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Basic Packing Technique (AREA)

Claims (3)

  1. Verfahren zum Einfüllen eines flüssigen oder viskosen Produkts bei einer Temperatur von mehr als 70°C in einen Kunststoffbehälter (1), der eine Seitenwand (2) umfasst, die mit einem Hals (3) und mit einem Boden (4) verbunden ist, wobei das Verfahren mindestens aus dem Füllen des Behälters (1) mit einem Produkt (5), dessen Temperatur höher als 70°C ist, dem hermetischen Verschließen des Behälters (1), dem Kühlen des Behälters (1) und seines Inhalts besteht, dadurch gekennzeichnet, dass ein Kunststoffbehälter (1) verwendet wird, dessen linearer Wärmeausdehnungskoeffizient der Seitenwand (2) höher als 0,00014 m/(m°K) ist, und dass dem Behälter (1) gestattet wird, sich mindestens ebenso viel wie das Volumen seines Inhalts auszudehnen und zusammenzuziehen, wenn er einer Temperaturänderung unterworfen wird.
  2. Einfüllverfahren nach Anspruch 1, wobei dem Behälter (1) gestattet wird, sich noch mehr als sein Inhalt auszudehnen und zusammenzuziehen.
  3. Verfahren zum Einfüllen bei einer Temperatur von mehr als 70°C nach Anspruch 1 oder 2, wobei nach dem Kühlen des Behälters (1) und seines Inhalts ein Druck von größer-gleich null im Behälter erzeugt wird.
EP08776552.5A 2007-07-11 2008-06-27 Verfahren zur Heißabfüllung von Kunststoffbehälter Active EP2167390B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08776552.5A EP2167390B1 (de) 2007-07-11 2008-06-27 Verfahren zur Heißabfüllung von Kunststoffbehälter

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07112225A EP2025603A1 (de) 2007-07-11 2007-07-11 Kunststoffflasche zur Warmabfüllung oder Wärmebehandlung
PCT/IB2008/052599 WO2009007869A2 (fr) 2007-07-11 2008-06-27 Bouteille plastique pour remplissage a chaud ou traitement thermique
EP08776552.5A EP2167390B1 (de) 2007-07-11 2008-06-27 Verfahren zur Heißabfüllung von Kunststoffbehälter

Publications (2)

Publication Number Publication Date
EP2167390A2 EP2167390A2 (de) 2010-03-31
EP2167390B1 true EP2167390B1 (de) 2015-03-25

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP07112225A Withdrawn EP2025603A1 (de) 2007-07-11 2007-07-11 Kunststoffflasche zur Warmabfüllung oder Wärmebehandlung
EP08776552.5A Active EP2167390B1 (de) 2007-07-11 2008-06-27 Verfahren zur Heißabfüllung von Kunststoffbehälter

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP07112225A Withdrawn EP2025603A1 (de) 2007-07-11 2007-07-11 Kunststoffflasche zur Warmabfüllung oder Wärmebehandlung

Country Status (9)

Country Link
US (1) US8567164B2 (de)
EP (2) EP2025603A1 (de)
JP (1) JP2010533106A (de)
CN (1) CN101730646B (de)
BR (1) BRPI0814702A2 (de)
CA (1) CA2692500C (de)
HK (1) HK1141499A1 (de)
RU (1) RU2474522C2 (de)
WO (1) WO2009007869A2 (de)

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US20070045221A1 (en) * 2005-08-26 2007-03-01 Graham Packaging Company, L.P. Plastic container having a ring-shaped reinforcement and method of making same
ITSV20050037A1 (it) * 2005-11-11 2007-05-12 Ribi Pack S P A Contenitore antieffrazione per bevande in materiale plastico quali pe, pet, pvc o equipollente
US7780025B2 (en) * 2005-11-14 2010-08-24 Graham Packaging Company, L.P. Plastic container base structure and method for hot filling a plastic container

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HK1141499A1 (en) 2010-11-12
CA2692500C (fr) 2015-08-04
US20100186352A1 (en) 2010-07-29
RU2474522C2 (ru) 2013-02-10
BRPI0814702A2 (pt) 2015-01-20
EP2167390A2 (de) 2010-03-31
WO2009007869A3 (fr) 2009-03-05
RU2010103020A (ru) 2011-08-20
CN101730646B (zh) 2011-08-10
CA2692500A1 (fr) 2009-01-15
US8567164B2 (en) 2013-10-29
JP2010533106A (ja) 2010-10-21
EP2025603A1 (de) 2009-02-18
CN101730646A (zh) 2010-06-09
WO2009007869A2 (fr) 2009-01-15

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