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WO2008080577A1 - Récipient en matière plastique pour boissons contenant du dioxyde de carbone - Google Patents

Récipient en matière plastique pour boissons contenant du dioxyde de carbone Download PDF

Info

Publication number
WO2008080577A1
WO2008080577A1 PCT/EP2007/011325 EP2007011325W WO2008080577A1 WO 2008080577 A1 WO2008080577 A1 WO 2008080577A1 EP 2007011325 W EP2007011325 W EP 2007011325W WO 2008080577 A1 WO2008080577 A1 WO 2008080577A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic
carbon dioxide
plastic container
contact surface
beverage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2007/011325
Other languages
German (de)
English (en)
Inventor
Hans-Werner Meixner
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.)
PI-PATENTE GmbH
Pi Patente GmbH
Original Assignee
PI-PATENTE GmbH
Pi Patente GmbH
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 PI-PATENTE GmbH, Pi Patente GmbH filed Critical PI-PATENTE GmbH
Publication of WO2008080577A1 publication Critical patent/WO2008080577A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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—Rigid or semi-rigid 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 or 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
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered

Definitions

  • the invention relates to a plastic container, in particular a plastic bottle for carbon dioxide-containing beverages.
  • carbon dioxide-containing beverage and “non-carbonated” beverage is always used below, since solutions of carbon dioxide in water, of which beverages are predominantly composed, contain substantially dissolved carbon dioxide molecules and less than one Percent of it actually be converted to carbonic acid.
  • carbon dioxide-containing beverages are to a considerable extent bottled and stored.
  • This type of packaging of a drink serves many purposes. First bottling, then storage and shelf life. In addition, claims of transport and sale to the end customer must be met.
  • the plastic bottle has gained increasing market share in this market segment in recent years, as its advantages over the glass bottle, such as lower weight and resistance to breakage, outweigh the packaging of most beverages.
  • plastic bottles are made according to the prior art for the most part from the plastic polyethylene terephthalate, hereinafter called PET.
  • PET plastic polyethylene terephthalate
  • the plastic bottles have the disadvantage that their walls are more permeable to gases than the walls of comparable glass beverage bottles.
  • the present invention is concerned with the improvement of plastic bottles for carbonated beverage.
  • the state of the art lent importance to the gas-tightness of the plastic bottles for carbon dioxide from the beverage, which will be discussed below.
  • the further influence on the gas-tightness of such a plastic bottle has the material thickness of the bottle wall. Due to the raw material price of the plastic but also by the weight of the finished beverage bottle the improvement of the gas-tightness by increasing the material thickness of the bottle wall economic and logistical limits.
  • the prior art (U.S. Patent No. 4,421,804) includes a carbonated beverage bottle made of plastic, to which a dibutyl sebacate is added, in a concentration of up to 0.5% to reduce the gas pressure in the headspace of the bottle ,
  • the technical problem underlying the invention is to provide a plastic container for carbon dioxide-containing beverages, in which the loss of carbon dioxide is reduced from the bottled in the plastic container beverage.
  • the task is to better preserve the carbon dioxide in the beverage by the properties of the plastic. This is not necessarily synonymous with a better gas tightness of the plastic. This is just the assumption from which each state of the art goes out so far.
  • the invention ignores this hitherto false assumption and shows a completely new way of counteracting the loss of carbon dioxide from the beverage. This is done by means of a different property of the plastic than the gas-tightness.
  • Substances have a specific surface energy, which is given in millinewtons per meter. This specific surface energy is based on the so-called van der Waals forces, which include all intermolecular attractive forces between atoms and / or molecules.
  • the Van der Waals forces consist of three groups of attractions.
  • the dipole-dipole forces occur only in molecules, not in atoms, which is due to their formation. They are generated in the molecules by the permanent spatial displacement of electrons on predominantly one side of the molecule. This spatial shift itself is generated by the attraction of at least one atomic nucleus of the molecule to the electrons involved. Outwardly, the molecule shows a positive and negative force of attraction, so-called poles, which are permanently present and in each case spatially opposite. This attraction acts between polar molecules.
  • the hydrogen bonds are also dipole-dipole forces, but are called hydrogen bonds, because hydrogen is included in the dipole-dipole molecule and, as a result, the attraction energy acting on other dipole-dipole molecules is relatively strong.
  • the London forces also called dispersion forces, arise from the unequal distribution of the electron cloud around the atomic nucleus.
  • the atom is thereby in positive frequency on one spatial side positive and then negative, on the opposite side correspondingly reversed.
  • the sequence is so fast that during a measurement the atom appears neutral to the outside.
  • Such an atom is therefore called non-polar, but this does not mean that there are no attractions, because if a neighboring atom has the same properties, there is considerable mutual attraction despite the rapid pole change.
  • the described attractive forces cause the binding in a substance by the attraction of the atoms and / or molecules among themselves.
  • Non-polar and polar substances do not attract each other.
  • a large number of molecular compounds have quite polar and nonpolar portions at the same time. Both attractions also act as specific surface energy on the surface of each substance.
  • the size of the forces is given in millinewtons per meter (mNm "1 ).
  • the invention generally relates to plastic containers.
  • the plastic PET is usually used.
  • This plastic has a special -specific surface energy of about 43.0 itiNm -1.
  • the inner beverage bottle surface which forms the contact surface with the carbon dioxide-containing beverage, according to the prior art, this value of specific energy.
  • this specific surface energy of the plastic bottle, at least at its contact surface with the carbon dioxide-containing beverage is increased to more than 55.0 mNm -1 . This is achieved by making this contact surface highly polar and thus hydrophilic by suitable measures.
  • the significantly higher specific surface energy of the contact surface of the plastic bottle acts, as will be explained below, in many ways successfully against the loss of carbon dioxide from the beverage.
  • the carbon dioxide remains much better in the beverage and therefore also occurs less through the wall of the plastic bottle to the outside.
  • the shelf life of the beverage is thereby significantly extended.
  • the water content of the beverage is attracted by the higher specific surface energy of the contact surface of the plastic bottle, since water has a strong dipole content.
  • the water molecules store more and closer to this contact surface of the plastic bottle and form an additional barrier for the carbon dioxide molecules.
  • the carbon dioxide molecules are not attracted to the polar surface of the plastic of the beverage bottle because carbon dioxide is non-polar.
  • the attraction of the contact surface of the plastic bottle on the water content of the drink enhances the attraction of the water molecules with each other. Since the carbon dioxide molecules are located in the spaces between the water molecules, they are better retained there. The non-polar carbon dioxide molecule is then trapped in the surrounding water in a polar field.
  • the plastic container for carbon dioxide-containing beverages according to the invention is characterized in that the plastic has at least one additive and / or is formed as a plastic subjected to at least one additional treatment, wherein the plastic by at least one additive or at least one additional treatment at least its surface facing the carbon dioxide-containing beverage (contact surface of the plastic to the carbon dioxide-containing beverage) is made more hydrophilic, as a plastic without the at least one additive and / or the at least one additional treatment. This leaves the carbon dioxide in a lot greater extent in the beverage than in the prior art plastic containers.
  • the contact surface of the plastic container with the carbon dioxide-containing beverage has a specific surface energy of more than 55 mNm -1 (millinewtons per meter).
  • the contact surface of the plastic container to the carbon dioxide-containing beverage has a higher specific surface energy than water, ie more than 72.8 mNm "1 on.
  • the at least one additive which produces the higher hydrophilicity of the plastic at least one surfactant.
  • This is an inexpensive additive that can be used to achieve the required properties.
  • the at least one additive which produces the higher hydrophilicity of the plastic is a synthetic surfactant, ie a detergent.
  • This surfactant is particularly suitable because it is inexpensive.
  • the specific surface energy of the contact surface of the plastic container is increased to the carbon dioxide-containing beverage compared to the normal value of this plastic by adding a fatty acid to the plastic.
  • the specific surface energy of the contact surface of the plastic container to the carbon dioxide-containing beverage compared to the normal value of this Kunststoff- Substance increased by adding a fatty acid partial ester mixture to the plastic.
  • the specific surface energy of the contact surface of the plastic container to the carbon dioxide beverage over the normal value of this plastic by adding a fatty acid partial ester mixture of Oleo Chemicals (company name) with the name Loxiol A4 (brand name) is increased to the plastic.
  • the specific surface energy of the contact surface of the plastic container is increased to the carbon dioxide-containing beverage compared to the normal value of this plastic by adding Dibutylsebazat to the plastic.
  • the specific surface energy of the contact surface of the plastic container to the carbon dioxide-containing beverage compared to the normal value of this plastic by adding an anionic / nonionic surfactant Atmer 1440 (product of ICI (company name)) to the plastic increased.
  • This product has proven to be inexpensive and suitable.
  • the specific surface energy of the contact surface of the plastic container is increased to the carbon dioxide-containing beverage compared to the normal value of this plastic by the addition of an additive in an amount of 0.5 to 5 percent by volume.
  • the specific surface energy of the contact surface of the plastic container to the Kohlendioxydhal- term beverage increased compared to the normal value of this plastic by painting the contact surface.
  • the specific surface energy of the contact surface of the plastic container to the carbon dioxide-containing beverage compared to the normal value of this plastic is increased by a plasma treatment of the plastic.
  • the specific surface energy of the contact surface of the plastic container to the carbon dioxide-containing beverage compared to the normal value of this plastic is increased by subjecting the contact surface of a corona treatment.
  • the specific surface energy of the contact surface of the plastic container to the carbon dioxide-containing beverage compared to the normal value of this plastic is increased by this plastic is grafted even before the preparation of the container, another plastic, which is highly polar and the specific surface energy is increased.
  • the contact surface of the plastic container with the carbon dioxide-containing beverage is formed as a contact surface drawing through its specific surface energy the water applied to it in a flat shape.
  • the contact surface of the plastic container with the carbon dioxide-containing beverage is a contact surface that flattens through its specific surface energy and has a water droplet applied to it. forms such that the remaining wetting angle is less than 46 degrees.
  • the contact surface of the plastic container to the carbon dioxide-containing beverage is formed by their specific surface energy as a contact surface in which forms a liquid film using the water in the beverage on its surface, in which the proportion of carbon dioxide is lower than the proportion of Carbon dioxide in the rest of the drink.
  • the contact surface of the plastic container with the carbon dioxide-containing beverage is formed as a contact surface covering its own surface by the formed liquid film, and thus the quantity of its own actual contact surface with the carbon dioxide in the beverage is considerably reduced.
  • the carbon dioxide of the carbon dioxide-containing beverage migrates from the beverage with closed plastic container much less through the bottle walls to the outside than in the prior art PET bottles.
  • the contact surface of the plastic container with the carbon dioxide-containing beverage is formed as a contact surface acting on the van der Waals forces of the beverage liquid by its specific surface energy and reinforcing its binding effect.
  • the plastic container is designed as a closable bottle. This is the most common form of a container for a drink.
  • the specific surface energy of such surfaces can be measured by the so-called static contact angle measurement by applying a drop of a test liquid of known surface tension to the surface. About the creation of a tangent to the Drops at the point of contact, the angle formed between the tangent and the base can be measured and used to calculate the specific surface energy.
  • the plastic granulate here polyethylene terephthalate (PET)
  • PET polyethylene terephthalate
  • Such a substance has a hydrophilic portion and a hydrophobic portion which is lipophilic.
  • it is a fatty acid partial ester mixture having surfactant properties with high oil solubility of the nonpolar end of the molecule.
  • the plastic is heated above its melting point.
  • the lipophilic part of the additive seeks to remain in the PET because it likes to associate with the PET.
  • the hydrophilic part of the additive strives away from the PET and thus comes to the surface of the plastic bottle.
  • the contact surface of the plastic bottle with the carbon dioxide-containing beverage is strongly hydrophilic as intended.
  • the specific surface energy is then at least 60 millinewtons per meter.
  • the surface specific energy value is comparatively about 43 millinewtons per meter.
  • this process is also temperature-dependent. At low temperature, this equilibrium sets in at a lower gas pressure. At higher temperatures, a higher gas pressure is created in the headspace of the plastic bottle until equilibrium is reached. For safety reasons, it is desirable with carbon dioxide-containing beverages to achieve this equilibrium state with the lowest possible gas pressure in the head space of the plastic bottle.
  • a plastic bottle according to the invention acts on the water content of the drink, the inner polar surface of the plastic bottle in such a way that the binding forces between the water molecules are increased.
  • the carbon dioxide molecules which are dissolved in the interstices in the water, tethered.
  • the pressure increase until equilibrium in the head space of a plastic bottle according to the invention is therefore only 70% or less than the pressure increase in the head space of a comparable plastic bottle which is not equipped according to the invention.
  • the figure shows a beverage bottle 1, which consists of a base body 2.
  • the main body 2 has a wall 3.
  • the bottle 1 has a bottom 4 and a bottleneck 5.
  • the bottle neck 5 opens into an opening 6 for filling the bottle 1 and for pouring the carbon dioxide-containing liquid from the bottle 1.
  • the opening 6 can with a screw (not shown) close be closed.
  • a screw thread 7 is provided for closing a screw thread 7 is provided.
  • the entire bottle 1 consists of a plastic in which a contact surface 8 to a carbon dioxide-containing beverage (not shown) has a higher specific surface energy than water.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

La présente invention concerne un récipient en matière plastique pour boissons contenant du dioxyde de carbone, dans laquelle la matière plastique comprend au moins un adjuvant et/ou est conçue comme une matière plastique soumise au moins à un traitement additionnel. Grâce audit au moins un adjuvant ou au traitement additionnel, la matière plastique est conçue, au moins sur sa surface tournée vers la boisson contenant du dioxyde de carbone (surface de contact de la matière plastique par rapport à la boisson contenant du dioxyde de carbone) plus hydrophile qu'une matière plastique sans adjuvant et/ou sans traitement additionnel.
PCT/EP2007/011325 2007-01-04 2007-12-21 Récipient en matière plastique pour boissons contenant du dioxyde de carbone Ceased WO2008080577A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007001104.2 2007-01-04
DE200710001104 DE102007001104A1 (de) 2007-01-04 2007-01-04 Verbesserung von Kunststoffflaschen zur Abfüllung und Aufbewahrung von kohlendioxydhaltigen Getränken

Publications (1)

Publication Number Publication Date
WO2008080577A1 true WO2008080577A1 (fr) 2008-07-10

Family

ID=39199081

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/011325 Ceased WO2008080577A1 (fr) 2007-01-04 2007-12-21 Récipient en matière plastique pour boissons contenant du dioxyde de carbone

Country Status (2)

Country Link
DE (1) DE102007001104A1 (fr)
WO (1) WO2008080577A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10731016B2 (en) 2016-07-18 2020-08-04 Conopco, Inc. Method of modifying the dispensing properties of a container

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311250A (en) * 1980-05-12 1982-01-19 The Continental Group, Inc. Container having internal wall surfaces modified to reduce carbonation loss
JPH05338639A (ja) * 1992-06-01 1993-12-21 Kuwabara Yasunaga 密封包装容器の着臭防止法
WO1998047773A1 (fr) * 1997-04-22 1998-10-29 The Procter & Gamble Company Contenant permettant un ecoulement ameliore de produits visqueux, composition et procede correspondant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311250A (en) * 1980-05-12 1982-01-19 The Continental Group, Inc. Container having internal wall surfaces modified to reduce carbonation loss
JPH05338639A (ja) * 1992-06-01 1993-12-21 Kuwabara Yasunaga 密封包装容器の着臭防止法
WO1998047773A1 (fr) * 1997-04-22 1998-10-29 The Procter & Gamble Company Contenant permettant un ecoulement ameliore de produits visqueux, composition et procede correspondant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10731016B2 (en) 2016-07-18 2020-08-04 Conopco, Inc. Method of modifying the dispensing properties of a container

Also Published As

Publication number Publication date
DE102007001104A1 (de) 2008-07-10

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