EP1571258B1 - Package coated with a protection varnish against light - Google Patents

Package coated with a protection varnish against light Download PDF

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Publication number
EP1571258B1
EP1571258B1 EP05290493A EP05290493A EP1571258B1 EP 1571258 B1 EP1571258 B1 EP 1571258B1 EP 05290493 A EP05290493 A EP 05290493A EP 05290493 A EP05290493 A EP 05290493A EP 1571258 B1 EP1571258 B1 EP 1571258B1
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EP
European Patent Office
Prior art keywords
fact
varnish
packaging according
sheet
packaging
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.)
Not-in-force
Application number
EP05290493A
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German (de)
French (fr)
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EP1571258A1 (en
Inventor
Alain Bethune
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LOreal SA
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LOreal SA
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Publication of EP1571258A1 publication Critical patent/EP1571258A1/en
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Publication of EP1571258B1 publication Critical patent/EP1571258B1/en
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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
    • 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
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/62—External coverings or coatings
    • 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
    • B65D65/02—Wrappers or flexible covers
    • B65D65/16—Wrappers or flexible covers with provision for excluding or admitting light
    • B65D65/20—Wrappers or flexible covers with provision for excluding or admitting light with provision for excluding light of a particular wavelength
    • 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 packaging, especially cardboard.
  • the cardboard sheets generally used for packaging can be characterized by their weight and the nature of their constituents.
  • Cardboard sheet denotes a sheet whose grammage is greater than 100 g / m 2 , especially greater than or equal to 190 g / m 2 , or even greater than 200 g / m 2 .
  • cartons containing conifers or called cardboard boxes
  • cardboards made from deciduous trees also called cellulose boards.
  • the bark of the conifers are mechanically chopped ( mechanical pulping ), which leads to rather long fibers.
  • Wood cartons generally have at least 80% by weight of coniferous fibers and are yellowish. These fibers contain lignin which darkens under the effect of ultraviolet radiation.
  • the cartons can be coated.
  • coated cardboard sheet thus refers to a sheet of cardboard that has a surface coating on one or both sides.
  • visible light is meant light of wavelength between 400 and 800 nm and “ultraviolet light” that of wavelength between 280 and 400 nm.
  • cellulose cartons which are less rich in lignin since they generally contain less than 15% by weight of coniferous fibers.
  • the lignin eventually migrates into the surface coating and yellowing is not permanently prevented.
  • the inks used to print the packages exist in several grades, which are more or less expensive depending on their resistance to ultraviolet. UV-resistant grades are preferentially used unless the product is intended to be sold quickly.
  • the packaging comprises a sheet of cardboard covered externally with a varnish comprising at least one additive intended to reduce the degradation of the packaging under the effect of light, for example the yellowing of the sheet under the light. effect of light and / or alteration of an underlying impression.
  • Cardboard sheet denotes in the description and the claims a sheet of cardboard or a sheet of a similar material, composite or not, having substantially the same mechanical behavior as the cardboard.
  • a composite material comprises, for example, vegetable fibers, in particular more than 40% by weight, better still 50% or more, these vegetable fibers being for example mixed with fibers made of synthetic material.
  • the invention makes it possible to produce a package with a cardboard sheet rich in lignin while effectively retarding the yellowing thereof.
  • the invention thus makes it possible to use stiffer wood cartons than cellulose cartons and to reduce the thickness of the sheet of cardboard of equal rigidity, which reduces the quantity of material used.
  • the presence of the varnish makes it possible to use underlying inks that are less resistant to ultraviolet, and therefore less expensive.
  • the invention thus allows significant savings on the cost of cardboard packaging.
  • the invention is advantageously applied to cardboard sheets comprising for example more than 70%, better 80%, by weight of coniferous fibers, rich in lignin.
  • the invention also makes it possible to protect the package without this protection requiring, if necessary, modifying the composition or the thickness of a possible surface coating of the sheet, which makes it possible to affect less, if not to not affect, its printability and mechanical characteristics, including stiffness or compressive strength.
  • the invention does not apply exclusively to coated cardboard sheets but also relates to uncoated cardboard sheets.
  • the surface coating may in particular be white and contain for example at least one optical brightener, which may be for example in a proportion of between 0.05 and 0.5 % by weight in the surface coating, better in a proportion of between 0.1 and 0.3%.
  • the surface coating may for example have a thickness of between 20 and 30 microns and contain calcium carbonate and / or clay, especially kaolin.
  • the surface coating comprises calcium carbonate and clay substantially in the 60/40 weight ratio.
  • the surface coating may also comprise a binder, especially starch, in order to improve its cohesion.
  • calcium carbonate which may in particular comprise fine spheroidal grains, may be useful for surface smoothness.
  • clay especially kaolin, which may have coarse prismatic grains, may be useful in achieving the desired density for the surface coating.
  • the thickness of the varnish may for example be between 2 and 20 ⁇ m, better still between 3 and 12 ⁇ m, the total thickness of the cardboard sheet being, for example, between 100 and 1000 ⁇ m, and preferably between 300 and 500 ⁇ m. .
  • the additive (s) may be present in a total mass proportion of additives of between 0.5 and 10% in the varnish, for example in a proportion of between 1 and 6%.
  • the varnish may comprise an additive which may be a UV absorber compound, for example a UV absorber of formula
  • the varnish may also comprise an additive which may be a free radical scavenging compound, especially a hindered amine or an HALS amine, for example a free radical scavenger of formula
  • the varnish may be based on aqueous solvent, for example an acrylic varnish.
  • the varnish may be a varnish crosslinkable under the action of UV radiation, which makes it possible not to have to evaporate water from the cardboard, which can retain its moisture.
  • the additive (s) intended to combat the effects of the light are chosen to be compatible with such a varnish.
  • the varnish does not comprise when it is crosslinkable under the action of ultraviolet radiation free radical sensors such as hindered amines or amines HALS (Hindered Amine Light Stabilizer is in French amine blocked stabilizing to light).
  • the varnish when it is crosslinkable under the action of UV radiation, can comprise, for example, two ultraviolet absorbers whose absorption spectra are chosen so as to provide a range of wavelengths in which absorption is less, and the lamp used to cause the polymerization is then chosen to emit in this range.
  • the varnish may include a violet dye, which tends to increase the whiteness of the cardboard sheet.
  • the sheet may be covered for example by about 3 to 10 g / m 2 of varnish before drying, including about 6 g / m 2 of varnish.
  • the present document further describes a method of manufacturing a package comprising a sheet of cardboard or the like, wherein a varnish is applied to the sheet containing at least one additive intended to reduce the degradation of the package under the effect of the light.
  • This additive may be a UV absorber compound and / or free radical scavenger.
  • the varnish can be applied by various techniques, including offset, heliography, flexography or screen printing.
  • the sheet can be printed before or after the application of the varnish.
  • the sheet is printed before the deposition of the varnish, which makes it possible to protect the ink from ultraviolet rays and thus to use less expensive inks.
  • This document further describes a sheet of cardboard having an impression of at least one ink of low resistance to ultraviolet, covered with a varnish comprising at least one ultraviolet absorber and / or free radical sensor, in particular one of those mentioned above.
  • the present document also describes an ultraviolet radiation curable varnish, comprising at least two ultraviolet absorbers chosen so as to have sufficiently offset absorption spectra to provide a range of wavelengths between them. the absorption is less, in view of the irradiation in this range during the crosslinking of the varnish.
  • the absorption peaks of the two additives are, for example, shifted by more than 40 nm and form between them a valley whose trough corresponds, for example, to an absorption which is less than 30% less than the maximum absorption defined by one of the peaks. .
  • the varnish may further comprise a violet dye.
  • the emission spectrum of the source may be centered for example on 310-330 nm approximately.
  • the present document further describes a sheet of cardboard coated with a varnish comprising at least one UV absorber additive and / or free radical scavenger.
  • the invention applies to all types of packaging made by folding, gluing and / or rolling of one or more sheets of cardboard or the like, and in particular to boxes for containing containers containing cosmetic or care products.
  • Such a box may have for example a parallelepipedal general shape as illustrated in FIG. figure 1 with at one end at least one folding tongue.
  • the invention is not limited to a particular form of packaging and can be made with a sheet of cardboard or the like coated with a varnish according to the invention packaging having very different shapes, and intended for example to contain cigarettes or other objects.
  • the packaging may include only the sheet of cardboard or the like and the varnish which covers it on the outside and exposed side of the packaging, so as to facilitate its recyclability.
  • the sheet of cardboard or the like may in particular be devoid of laminated polymer film.
  • the sheet used may comprise a base 1, preferably comprising coniferous fibers, thus containing lignin, and at least on the outside of the package a surface coating 2 in the case where the sheet is a sheet of cardboard coated .
  • a base 1 preferably comprising coniferous fibers, thus containing lignin
  • a surface coating 2 in the case where the sheet is a sheet of cardboard coated .
  • cellulosic fibers these may come from the Aspen tree, for example.
  • the surface coating 2 whose thickness is for example between 20 and 30 microns, can improve the printability and varnishing characteristics of the cardboard sheet and improve its whiteness.
  • the coating layer 2 comprises for example calcium carbonate and clay, especially kaolin, in a mass ratio compatible with the manufacturing processes used, for example 60/40.
  • the surface coating 2 may be devoid of light-protecting compounds such as carbon black or an oxide of iron or zinc.
  • the surface coating 2 may comprise at least one optical brightener, for example in a mass proportion of between 0.05 and 0.5%, better still 0.1 and 0.3%.
  • the cardboard sheet is covered on the outside of the package by a layer of varnish 3, the latter comprising at least one compound intended to protect the sheet from the effects of light, in particular from yellowing due to visible and / or ultraviolet light, in particular wavelengths between 290 and 460 nm.
  • the varnish 3, which can be colorless and does not substantially modify the color of the underlying sheet, comprises for example at least one UV absorber compound and / or a free radical scavenging compound.
  • the varnish 3 can be applied by various known techniques, for example heliography, flexography, screen printing or offset.
  • the thickness of varnish 3 deposited may depend on the deposition technique used, from about 2 ⁇ m for the offset to about 20 ⁇ m for flexography. Preferably, the thickness deposited will be between 3 and 12 microns.
  • the varnish 3 is preferably applied after the printing of a decoration 4 on the sheet, as illustrated in FIG. figure 3 , but could alternatively be applied prior to the application of the decor 4, as illustrated in FIG. figure 4 .
  • the varnish 3 When the varnish 3 is applied after the printing of a decoration 4 on the sheet, the varnish 3 can usefully protect the inks of the decorative layer 4 by a color change.
  • the varnish 3 then makes it possible to use light-sensitive inks, such as, for example, fluorescent inks which are unstable or sensitive to the phenomenon of metamerism.
  • the layer of varnish 3 may for example absorb light of wavelengths between 290 and 460 nm in a large proportion, so for example to increase by at least 50%, better to double, the duration of exposure to light leading to the same effects of degradation of the package in its absence.
  • the proportion of additive (s) may be between 0.5 and 10% by weight in the varnish 3, and better between 1 and 6%, for example between 3 and 6%.
  • additives that may be used, mention may be made especially of those sold by the companies GREAT LAKES and CIBA-GEIGY, and in particular derivatives of the benzotriazole family.
  • Such derivatives may be heterocycles of cyclo-benzene type, on which a carbon atom has been replaced.
  • the free radical scavenger (s) used may be sterically hindered amines AES or HALS amines.
  • the free radical sensor (s) can stabilize the varnish and prevent its own yellowing.
  • the nature of the varnish used may depend on the selected printing process and drying method.
  • varnish offsets fat which yell naturally by oxidation will be avoided.
  • this varnish comprises, for example, at least two UV absorbers, for example each at a concentration of less than 3% by weight, better than or equal to 2%. whose absorption spectra are chosen so as to provide a range of wavelengths where the additives absorb less and allow a UV source to cause the crosslinking of the varnish.
  • One of the additives is for example at a concentration of 2% and the other of 1%, so as to have a total concentration of less than or equal to 3%.
  • the absorption spectrum of a varnish (for a path of 1 cm after dilution in toluene at 20 mg / l) comprising two additives whose absorption spectra have respective peaks 10 and 11 between them a valley whose background 12 is for example centered on an emission wavelength of the source used to crosslink the varnish, for example 320 nm.
  • UV absorbers are for example an aromatic triazine derivative such as that marketed by CIBA under the name TINUVIN 400, of general formula: and a benzophenine derivative such as for example that marketed by CIBA under the reference CGL 477, of general formula:
  • the minimum absorption observed in the bottom 12 of the valley is, for example, less than 30% less than the maximum absorption A max observed for one of the peaks 10 and 11.
  • the varnish may comprise a violet dye in order to increase the whiteness of the sheet, this dye being for example at a concentration of less than or equal to 1%.
  • a varnish 3 it is possible to carry out a test consisting in depositing a predefined quantity, for example 6 g / m 2 , of varnish wet water on a sheet of cardboard with a total thickness of 350 ⁇ m, and then expose the sheet thus covered for a predefined period to a mercury vapor lamp.
  • concentration of additives in the varnish can for example reach 5% by weight.
  • An "Anilox" cylinder with a volume of at least 13 cm 3 can be used to apply the varnish.
  • Yellowing is measured on the Wool scale, which corresponds to a blue scale of increasing light intensity, standardized from 1 to 8.
  • the measured yellowing can for example reach on the Wool scale the value 3.
  • the yellowing measured can pass to a value at least equal to 4, which highlights the resistance greater yellowing of the cardboard sheet coated with varnish.
  • the change from value 3 to 4 corresponds to a doubling of the duration of the light stability.
  • the varnish is a UV-crosslinkable varnish
  • an increase in whiteness can be observed over time linked to a curing of the varnish continuing over time, when the exposure to the artificial source to cause the polymerization n was not sufficient to polymerize the varnish as much as possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Paints Or Removers (AREA)

Abstract

Package (A) comprises a sheet of cardboard covered on the outside with a varnish (3) that contains at least one additive (I) that reduces light-induced degradation of the package. Independent claims are also included for: (1) method for preparing (A); and (2) sheet of cardboard for preparing (A).

Description

La présente invention concerne les emballages, notamment cartonnés.The present invention relates to packaging, especially cardboard.

Les feuilles de carton généralement utilisées pour les emballages peuvent se caractériser par leur grammage et par la nature de leurs constituants.The cardboard sheets generally used for packaging can be characterized by their weight and the nature of their constituents.

Par « feuille de carton », on désigne une feuille dont le grammage est supérieur à 100g/m2, notamment supérieur ou égal à 190 g/m2, voire supérieur à 200 g/m2."Cardboard sheet" denotes a sheet whose grammage is greater than 100 g / m 2 , especially greater than or equal to 190 g / m 2 , or even greater than 200 g / m 2 .

On distingue les cartons à base de conifères, ou encore appelés cartons bois, et les cartons à base d'arbres caduques, encore appelés cartons cellulose.There are cartons containing conifers, or called cardboard boxes, and cardboards made from deciduous trees, also called cellulose boards.

Pour fabriquer la pâte des cartons bois, les écorces des conifères sont hachées mécaniquement (mechanical pulping), ce qui conduit à des fibres assez longues.To make the pulp of the wooden boards , the bark of the conifers are mechanically chopped ( mechanical pulping ), which leads to rather long fibers.

Les cartons bois présentent généralement au moins 80 % en masse de fibres de conifères et sont jaunâtres. Ces fibres comportent de la lignine qui fonce sous l'effet du rayonnement ultraviolet.Wood cartons generally have at least 80% by weight of coniferous fibers and are yellowish. These fibers contain lignin which darkens under the effect of ultraviolet radiation.

Pour améliorer l'aspect de surface, l'imprimabilité ou le vernissage et accroître la blancheur, les cartons peuvent être couchés.To improve the surface appearance, printability or varnishing and to increase the whiteness, the cartons can be coated.

L'expression « feuille de carton couchée » désigne ainsi une feuille de carton qui comporte un revêtement de surface sur l'une ou sur ses deux faces.The term "coated cardboard sheet" thus refers to a sheet of cardboard that has a surface coating on one or both sides.

Le jaunissement des feuilles de carton riches en lignine sous l'effet de la lumière visible et surtout du rayonnement ultraviolet est un problème très ancien que les fabricants s'efforcent de résoudre, car ce jaunissement diminue grandement l'attrait de l'emballage pour le consommateur.The yellowing of lignin-rich cardboard sheets under the effect of visible light and especially ultraviolet radiation is a very old problem that the manufacturers are trying to solve, since this yellowing greatly reduces the appeal of the packaging for the consumer.

Par « lumière visible », on désigne la lumière de longueur d'onde comprise entre 400 et 800 nm et par « lumière ultraviolette » celle de longueur d'onde comprise entre 280 et 400 nm.By "visible light" is meant light of wavelength between 400 and 800 nm and "ultraviolet light" that of wavelength between 280 and 400 nm.

Pour éviter d'être confronté au problème du jaunissement lié à la présence de lignine ou minimiser celui-ci, il est possible d'utiliser les cartons cellulose qui sont moins riches en lignine car comportant généralement moins de 15 % en masse de fibres de conifères.To avoid the problem of lignin-related yellowing or to minimize lignin, it is possible to use cellulose cartons which are less rich in lignin since they generally contain less than 15% by weight of coniferous fibers. .

Toutefois, ces cartons qui utilisent une matière première moins répandue dans certaines régions du monde et nécessitent un traitement chimique (chemical pulping) sont habituellement plus coûteux que les cartons bois.However, these cartons that use less raw material in some parts of the world and require chemical pulping are usually more expensive than cartons.

De plus, la rigidité mécanique de ces cartons est généralement moins bonne que celle des cartons bois, de sorte que le grammage doit être plus élevé à rigidité égale, ce qui rend l'utilisation des cartons cellulose réservée aux produits chers.In addition, the mechanical rigidity of these cartons is generally less good than that of wood cartons, so that the basis weight must be higher at equal stiffness, which makes the use of cellulose boards reserved for expensive products.

Il est connu de retarder le jaunissement des cartons riches en lignine en incorporant dans le revêtement de surface un additif à base de noir de carbone, d'oxyde de fer ou de zinc, mais cela nuit à la blancheur du revêtement et/ou peut nuire à la compatibilité alimentaire.It is known to retard the yellowing of lignin-rich cartons by incorporating into the surface coating an additive based on carbon black, iron oxide or zinc, but this affects the whiteness of the coating and / or can harm to food compatibility.

De plus, la lignine finit par migrer dans le revêtement de surface et le jaunissement n'est pas définitivement empêché.In addition, the lignin eventually migrates into the surface coating and yellowing is not permanently prevented.

Il est également connu de contre-coller un film polymérique contenant du dioxyde de titane, mais cela modifie l'aspect et les caractéristiques au toucher de la feuille de carton et peut rendre plus difficile la recyclabilité de celle-ci.It is also known to laminate a polymeric film containing titanium dioxide, but this modifies the appearance and the characteristics to the touch of the cardboard sheet and may make it more difficult to recyclability thereof.

Par ailleurs, les encres utilisées pour imprimer les emballages existent sous plusieurs grades, lesquels sont plus ou moins coûteux selon leur résistance aux ultraviolets. Les grades résistant aux ultraviolets sont préférentiellement utilisés sauf si le produit est destiné à être vendu rapidement.In addition, the inks used to print the packages exist in several grades, which are more or less expensive depending on their resistance to ultraviolet. UV-resistant grades are preferentially used unless the product is intended to be sold quickly.

Il est également connu d'incorporer des azurants dans les feuilles de carton, afin d'accroître la blancheur, mais ces azurants sont sensibles aux ultraviolets et d'efficacité ainsi limitée dans le temps.It is also known to incorporate brighteners in the cardboard sheets, in order to increase the whiteness, but these brighteners are sensitive to ultraviolet and effectiveness and limited in time.

Il existe un besoin pour réduire le coût des emballages sans pour autant que cette réduction s'effectue au détriment des propriétés mécaniques de l'emballage ou de son aspect au cours du temps, notamment sous l'effet du rayonnement ultraviolet.There is a need to reduce the cost of packaging without the reduction being to the detriment of the mechanical properties of the packaging or its appearance over time, especially under the effect of ultraviolet radiation.

Selon l'invention, l'emballage comporte une feuille de carton recouverte extérieurement d'un vernis comportant au moins un additif visant à réduire la dégradation de l'emballage sous l'effet de la lumière, par exemple le jaunissement de la feuille sous l'effet de la lumière et/ou l'altération d'une impression sous-jacente.According to the invention, the packaging comprises a sheet of cardboard covered externally with a varnish comprising at least one additive intended to reduce the degradation of the packaging under the effect of light, for example the yellowing of the sheet under the light. effect of light and / or alteration of an underlying impression.

Par « feuille de carton », on désigne dans la description et les revendications une feuille de carton ou une feuille d'un matériau analogue, composite ou non, ayant sensiblement le même comportement mécanique que le carton. Un tel matériau composite comporte par exemple encore des fibres végétales, notamment plus de 40 % en masse, mieux 50 % ou plus encore, ces fibres végétales étant par exemple mélangées à des fibres en matière synthétique."Cardboard sheet" denotes in the description and the claims a sheet of cardboard or a sheet of a similar material, composite or not, having substantially the same mechanical behavior as the cardboard. Such a composite material comprises, for example, vegetable fibers, in particular more than 40% by weight, better still 50% or more, these vegetable fibers being for example mixed with fibers made of synthetic material.

L'invention permet de réaliser un emballage avec une feuille de carton riche en lignine tout en retardant efficacement le jaunissement de celle-ci.The invention makes it possible to produce a package with a cardboard sheet rich in lignin while effectively retarding the yellowing thereof.

L'invention permet ainsi d'utiliser des cartons bois plus rigides que les cartons cellulose et de diminuer l'épaisseur de la feuille de carton à rigidité égale, ce qui diminue la quantité de matière utilisée.The invention thus makes it possible to use stiffer wood cartons than cellulose cartons and to reduce the thickness of the sheet of cardboard of equal rigidity, which reduces the quantity of material used.

En outre, la présence du vernis permet d'utiliser des encres sous-jacentes moins résistantes aux ultraviolets, donc moins coûteuses.In addition, the presence of the varnish makes it possible to use underlying inks that are less resistant to ultraviolet, and therefore less expensive.

L'invention permet ainsi de réaliser des économies importantes sur le coût d'un emballage cartonné.The invention thus allows significant savings on the cost of cardboard packaging.

L'invention s'applique avantageusement aux feuilles de carton comportant par exemple plus de 70 %, mieux 80 %, en masse de fibres de conifères, riches en lignine.The invention is advantageously applied to cardboard sheets comprising for example more than 70%, better 80%, by weight of coniferous fibers, rich in lignin.

L'invention permet encore de protéger l'emballage sans que cette protection ne nécessite, le cas échéant, de modifier la composition ou l'épaisseur d'un revêtement de surface éventuel de la feuille, ce qui permet de moins affecter, voire de ne pas affecter, ses caractéristiques d'imprimabilité et ses caractéristiques mécaniques, notamment de rigidité ou de résistance à la compression.The invention also makes it possible to protect the package without this protection requiring, if necessary, modifying the composition or the thickness of a possible surface coating of the sheet, which makes it possible to affect less, if not to not affect, its printability and mechanical characteristics, including stiffness or compressive strength.

Ainsi, les procédés et machines existants utilisés pour la fabrication des emballages ou le conditionnement des produits dans ces emballages peuvent être conservés.Thus, existing processes and machines used for the manufacture of packaging or the packaging of products in such packaging can be retained.

L'invention ne s'applique pas exclusivement aux feuilles de carton couchées mais concerne également les feuilles de carton non couchées.The invention does not apply exclusively to coated cardboard sheets but also relates to uncoated cardboard sheets.

Dans le cas où l'invention est appliquée aux feuilles de carton couchées, le revêtement de surface peut notamment être blanc et contenir par exemple au moins un azurant optique, lequel peut être par exemple dans une proportion comprise entre 0,05 et 0,5 % en masse dans le revêtement de surface, mieux dans une proportion comprise entre 0,1 et 0,3 %.In the case where the invention is applied to coated cardboard sheets, the surface coating may in particular be white and contain for example at least one optical brightener, which may be for example in a proportion of between 0.05 and 0.5 % by weight in the surface coating, better in a proportion of between 0.1 and 0.3%.

Le revêtement de surface peut présenter par exemple une épaisseur comprise entre 20 et 30 µm et contenir du carbonate de calcium et/ou de l'argile, notamment du kaolin. Dans un exemple de mise en oeuvre de l'invention, le revêtement de surface comporte du carbonate de calcium et de l'argile sensiblement dans le rapport massique 60/40.The surface coating may for example have a thickness of between 20 and 30 microns and contain calcium carbonate and / or clay, especially kaolin. In an exemplary implementation of the invention, the surface coating comprises calcium carbonate and clay substantially in the 60/40 weight ratio.

Le revêtement de surface peut également comporter un liant, notamment de l'amidon, afin d'améliorer sa cohésion.The surface coating may also comprise a binder, especially starch, in order to improve its cohesion.

La présence de carbonate de calcium, lequel peut notamment comporter des grains fins sphéroïdaux, peut être utile pour le lissé de surface.The presence of calcium carbonate, which may in particular comprise fine spheroidal grains, may be useful for surface smoothness.

La présence d'argile, notamment de kaolin, lequel peut présenter des grains grossiers prismatiques, peut être utile pour obtenir la densité souhaitée pour le revêtement de surface.The presence of clay, especially kaolin, which may have coarse prismatic grains, may be useful in achieving the desired density for the surface coating.

L'épaisseur de vernis peut être comprise par exemple entre 2 et 20 µm, mieux entre 3 et 12 µm, l'épaisseur totale de la feuille de carton étant par exemple comprise entre 100 et 1000 µm, et de préférence entre 300 et 500 µm.The thickness of the varnish may for example be between 2 and 20 μm, better still between 3 and 12 μm, the total thickness of the cardboard sheet being, for example, between 100 and 1000 μm, and preferably between 300 and 500 μm. .

Le ou les additifs peuvent être présents dans une proportion massique totale en additifs comprise entre 0,5 et 10 % dans le vernis, par exemple dans une proportion comprise entre 1 et 6 %.The additive (s) may be present in a total mass proportion of additives of between 0.5 and 10% in the varnish, for example in a proportion of between 1 and 6%.

Le vernis peut comporter un additif qui peut être un composé absorbeur d'UV, par exemple un absorbeur d'UV de formule

Figure imgb0001
The varnish may comprise an additive which may be a UV absorber compound, for example a UV absorber of formula
Figure imgb0001

Le vernis peut encore comporter un additif qui peut être un composé capteur de radicaux libres, notamment une amine à empêchement stérique ou une amine HALS, par exemple un capteur de radicaux libres de formule

Figure imgb0002
The varnish may also comprise an additive which may be a free radical scavenging compound, especially a hindered amine or an HALS amine, for example a free radical scavenger of formula
Figure imgb0002

Le vernis peut être à base de solvant aqueux, étant par exemple un vernis acrylique.The varnish may be based on aqueous solvent, for example an acrylic varnish.

En variante, le vernis peut être un vernis réticulable sous l'action d'un rayonnement UV, ce qui permet de ne pas à avoir à évaporer l'eau du carton, lequel peut conserver son humidité. Dans ce cas, le ou les additifs destinés à lutter contre les effets de la lumière sont choisis pour être compatibles avec un tel vernis. En particulier, il est préférable que le vernis ne comporte pas lorsqu'il est réticulable sous l'action d'un rayonnement ultraviolet de capteurs radicaux libres tels que des amines à empêchement stérique ou des amines HALS (Hindered Amine Light Stabilizer soit en français amine bloquée stabilisant à la lumière).Alternatively, the varnish may be a varnish crosslinkable under the action of UV radiation, which makes it possible not to have to evaporate water from the cardboard, which can retain its moisture. In this case, the additive (s) intended to combat the effects of the light are chosen to be compatible with such a varnish. In particular, it is preferable that the varnish does not comprise when it is crosslinkable under the action of ultraviolet radiation free radical sensors such as hindered amines or amines HALS (Hindered Amine Light Stabilizer is in French amine blocked stabilizing to light).

Le vernis, lorsqu'il est réticulable sous l'action d'un rayonnement UV, peut comporter par exemple deux absorbeurs d'ultraviolets dont les spectres d'absorption sont choisis de manière à ménager une plage de longueurs d'onde où l'absorption est moindre, et la lampe utilisée pour provoquer la polymérisation est alors choisie pour émettre dans cette plage.The varnish, when it is crosslinkable under the action of UV radiation, can comprise, for example, two ultraviolet absorbers whose absorption spectra are chosen so as to provide a range of wavelengths in which absorption is less, and the lamp used to cause the polymerization is then chosen to emit in this range.

Cela permet d'éviter que les absorbeurs d'ultraviolet présents dans le vernis remplissent leur fonction de protection, sans entraver outre mesure la polymérisation du vernis.This makes it possible to prevent the ultraviolet absorbers present in the varnish from fulfilling their protective function, without unduly hindering the polymerization of the varnish.

Le vernis peut comporter un colorant violet, ce qui tend à accroître la blancheur de la feuille de carton.The varnish may include a violet dye, which tends to increase the whiteness of the cardboard sheet.

La feuille peut être recouverte par exemple par environ 3 à 10 g/m2 de vernis avant séchage, notamment environ 6 g/m2 de vernis.The sheet may be covered for example by about 3 to 10 g / m 2 of varnish before drying, including about 6 g / m 2 of varnish.

Le présent document décrit encore un procédé de fabrication d'un emballage comportant une feuille de carton ou analogue, dans lequel on applique sur la feuille un vernis contenant au moins un additif visant à réduire la dégradation de l'emballage sous l'effet de la lumière.The present document further describes a method of manufacturing a package comprising a sheet of cardboard or the like, wherein a varnish is applied to the sheet containing at least one additive intended to reduce the degradation of the package under the effect of the light.

Cet additif peut être un composé absorbeur d'UV et/ou capteur de radicaux libres.This additive may be a UV absorber compound and / or free radical scavenger.

Le vernis peut être appliqué par diverses techniques, notamment par offset, héliographie, flexographie ou sérigraphie.The varnish can be applied by various techniques, including offset, heliography, flexography or screen printing.

La feuille peut être imprimée préalablement ou postérieurement à l'application du vernis.The sheet can be printed before or after the application of the varnish.

De préférence, la feuille est imprimée avant le dépôt du vernis, ce qui permet de protéger l'encre des rayons ultraviolets et donc d'utiliser des encres moins coûteuses.Preferably, the sheet is printed before the deposition of the varnish, which makes it possible to protect the ink from ultraviolet rays and thus to use less expensive inks.

Le présent document décrit encore une feuille de carton comportant une impression d'au moins une encre de faible résistance aux ultraviolets, recouverte par un vernis comportant au moins un absorbeur d'ultraviolets et/ou un capteur de radicaux libres, notamment l'un de ceux mentionnés plus haut.This document further describes a sheet of cardboard having an impression of at least one ink of low resistance to ultraviolet, covered with a varnish comprising at least one ultraviolet absorber and / or free radical sensor, in particular one of those mentioned above.

Le présent document décrit encore un vernis réticulable sous l'effet d'un rayonnement ultraviolet, comportant au moins deux absorbeurs de rayons ultraviolets choisis de manière à avoir des spectres d'absorption suffisamment décalés pour ménager entre eux une plage de longueurs d'onde où l'absorption est moindre, en vue de l'irradiation dans cette plage lors de la réticulation du vernis.The present document also describes an ultraviolet radiation curable varnish, comprising at least two ultraviolet absorbers chosen so as to have sufficiently offset absorption spectra to provide a range of wavelengths between them. the absorption is less, in view of the irradiation in this range during the crosslinking of the varnish.

Les pics d'absorption des deux additifs sont par exemple décalés de plus de 40 nm et ménagent entre eux une vallée dont le creux correspond par exemple à une absorption inférieure de plus de 30 % à l'absorption maximale définie par l'un des pics.The absorption peaks of the two additives are, for example, shifted by more than 40 nm and form between them a valley whose trough corresponds, for example, to an absorption which is less than 30% less than the maximum absorption defined by one of the peaks. .

Le vernis peut comporter en outre un colorant violet.The varnish may further comprise a violet dye.

Le spectre d'émission de la source peut être centré par exemple sur 310-330 nm environ.The emission spectrum of the source may be centered for example on 310-330 nm approximately.

Le présent document décrit encore une feuille de carton revêtue d'un vernis comportant au moins un additif absorbeur d'UV et/ou capteur de radicaux libres.The present document further describes a sheet of cardboard coated with a varnish comprising at least one UV absorber additive and / or free radical scavenger.

L'invention pourra être mieux comprise à la lecture de la description détaillée qui va suivre, d'exemples de mise en oeuvre non limitatifs de celle-ci, et à l'examen du dessin annexé, sur lequel :

  • la figure 1 représente de manière schématique, en perspective, un exemple d'emballage réalisé par pliage d'une feuille de carton ou analogue revêtue d'un vernis conforme à l'invention,
  • les figures 2 à 4 sont des coupes schématiques et partielles d'une feuille de carton revêtue illustrant divers exemples de mise en oeuvre de l'invention, et
  • la figure 5 représente de manière schématique l'absorption en fonction de la longueur d'onde pour un exemple de vernis susceptible d'être utilisé.
The invention will be better understood on reading the following detailed description, non-limiting examples of implementation thereof, and on examining the appended drawing, in which:
  • the figure 1 shows schematically, in perspective, an example of packaging made by folding a sheet of cardboard or the like coated with a varnish according to the invention,
  • the Figures 2 to 4 are schematic and partial sections of a coated cardboard sheet illustrating various embodiments of the invention, and
  • the figure 5 schematically shows the absorption as a function of the wavelength for an example of varnish that can be used.

L'invention s'applique à tous types d'emballages réalisés par pliage, collage et/ou roulage d'une ou plusieurs feuilles de carton ou analogue, et notamment à des boîtes destinées à contenir des récipients contenant des produits cosmétiques ou de soin.The invention applies to all types of packaging made by folding, gluing and / or rolling of one or more sheets of cardboard or the like, and in particular to boxes for containing containers containing cosmetic or care products.

Une telle boîte peut présenter par exemple une forme générale parallélépipédique comme illustré à la figure 1, avec à une extrémité au moins une languette rabattable.Such a box may have for example a parallelepipedal general shape as illustrated in FIG. figure 1 with at one end at least one folding tongue.

Bien entendu, l'invention n'est pas limitée à une forme particulière d'emballage et l'on peut réaliser avec une feuille de carton ou analogue revêtue d'un vernis conformément à l'invention des emballages ayant des formes très diverses, et destinés par exemple à contenir des cigarettes ou autres objets.Of course, the invention is not limited to a particular form of packaging and can be made with a sheet of cardboard or the like coated with a varnish according to the invention packaging having very different shapes, and intended for example to contain cigarettes or other objects.

L'emballage ne peut comporter que la feuille de carton ou analogue et le vernis qui la recouvre du côté extérieur et exposé de l'emballage, de façon à faciliter sa recyclabilité. La feuille de carton ou analogue peut notamment être dépourvue de film polymère contre-collé.The packaging may include only the sheet of cardboard or the like and the varnish which covers it on the outside and exposed side of the packaging, so as to facilitate its recyclability. The sheet of cardboard or the like may in particular be devoid of laminated polymer film.

La feuille utilisée peut comporter une base 1, comportant de préférence des fibres de conifères, donc contenant de la lignine, et au moins du côté extérieur de l'emballage un revêtement de surface 2 dans le cas où la feuille est une feuille de carton couchée. Lorsque la feuille comporte des fibres cellulosiques, celles-ci peuvent provenir de l'arbre Aspen par exemple.The sheet used may comprise a base 1, preferably comprising coniferous fibers, thus containing lignin, and at least on the outside of the package a surface coating 2 in the case where the sheet is a sheet of cardboard coated . When the sheet comprises cellulosic fibers, these may come from the Aspen tree, for example.

Le revêtement de surface 2, dont l'épaisseur est par exemple comprise entre 20 et 30 µm, peut améliorer les caractéristiques d'imprimabilité et de vernissage de la feuille de carton et améliorer sa blancheur.The surface coating 2, whose thickness is for example between 20 and 30 microns, can improve the printability and varnishing characteristics of the cardboard sheet and improve its whiteness.

La couche de revêtement 2 comporte par exemple du carbonate de calcium et de l'argile, notamment du kaolin, dans un rapport massique compatible avec les procédés de fabrication utilisés, par exemple 60/40.The coating layer 2 comprises for example calcium carbonate and clay, especially kaolin, in a mass ratio compatible with the manufacturing processes used, for example 60/40.

Le revêtement de surface 2 peut être dépourvu de composés de protection vis-à-vis de la lumière tels que du noir de carbone ou un oxyde de fer ou de zinc.The surface coating 2 may be devoid of light-protecting compounds such as carbon black or an oxide of iron or zinc.

Le revêtement de surface 2 peut comporter au moins un azurant optique, par exemple dans une proportion massique comprise entre 0,05 et 0,5 %, mieux 0,1 et 0,3 %.The surface coating 2 may comprise at least one optical brightener, for example in a mass proportion of between 0.05 and 0.5%, better still 0.1 and 0.3%.

Conformément à l'invention, la feuille de carton est recouverte du côté extérieur de l'emballage par une couche de vernis 3, ce dernier comportant au moins un composé destiné à protéger la feuille des effets de la lumière, notamment du jaunissement dû à la lumière visible et/ou ultraviolette, en particulier de longueurs d'ondes comprises entre 290 et 460 nm.According to the invention, the cardboard sheet is covered on the outside of the package by a layer of varnish 3, the latter comprising at least one compound intended to protect the sheet from the effects of light, in particular from yellowing due to visible and / or ultraviolet light, in particular wavelengths between 290 and 460 nm.

Le vernis 3, qui peut être incolore et ne pas modifier sensiblement la couleur de la feuille sous-jacente, comporte par exemple au moins un composé absorbeur d'UV et/ou un composé capteur de radicaux libres.The varnish 3, which can be colorless and does not substantially modify the color of the underlying sheet, comprises for example at least one UV absorber compound and / or a free radical scavenging compound.

Le vernis 3 peut être appliqué par diverses techniques connues, par exemple d'héliographie, de flexographie, de sérigraphie ou d'offset.The varnish 3 can be applied by various known techniques, for example heliography, flexography, screen printing or offset.

L'épaisseur de vernis 3 déposée pourra dépendre de la technique de dépôt employée, de 2 µm environ pour l'offset à 20 µm environ pour la flexographie. De préférence, l'épaisseur déposée sera comprise entre 3 et 12 µm.The thickness of varnish 3 deposited may depend on the deposition technique used, from about 2 μm for the offset to about 20 μm for flexography. Preferably, the thickness deposited will be between 3 and 12 microns.

Le vernis 3 est de préférence appliqué après l'impression d'un décor 4 sur la feuille, comme illustré à la figure 3, mais pourrait en variante être appliqué préalablement à l'application du décor 4, comme illustré à la figure 4.The varnish 3 is preferably applied after the printing of a decoration 4 on the sheet, as illustrated in FIG. figure 3 , but could alternatively be applied prior to the application of the decor 4, as illustrated in FIG. figure 4 .

Lorsque le vernis 3 est appliqué après l'impression d'un décor 4 sur la feuille, le vernis 3 peut utilement protéger les encres de la couche de décor 4 d'un changement de couleur.When the varnish 3 is applied after the printing of a decoration 4 on the sheet, the varnish 3 can usefully protect the inks of the decorative layer 4 by a color change.

Le vernis 3 permet alors d'utiliser des encres sensibles à la lumière, telles que par exemple des encres fluorescentes instables ou sensibles au phénomène de métamérisme.The varnish 3 then makes it possible to use light-sensitive inks, such as, for example, fluorescent inks which are unstable or sensitive to the phenomenon of metamerism.

De nombreux additifs peuvent être incorporés au vernis 3 afin d'obtenir la fonction de protection recherchée.Many additives can be incorporated in the varnish 3 in order to obtain the desired protective function.

Ce ou ces additifs sont dans une concentration qui pourra dépendre de leur efficacité, cette dernière étant proportionnelle à la concentration et à l'épaisseur de la couche de vernis selon la loi de BEER LAMBERT. La couche de vernis 3 pourra par exemple absorber la lumière de longueurs d'onde comprises entre 290 et 460 nm dans une large proportion, de façon par exemple à augmenter d'au moins 50 %, mieux de doubler, la durée d'exposition à la lumière conduisant aux mêmes effets de dégradation de l'emballage qu'en son absence.This or these additives are in a concentration that may depend on their effectiveness, the latter being proportional to the concentration and thickness of the varnish layer according to BEER LAMBERT's law. The layer of varnish 3 may for example absorb light of wavelengths between 290 and 460 nm in a large proportion, so for example to increase by at least 50%, better to double, the duration of exposure to light leading to the same effects of degradation of the package in its absence.

Typiquement, la proportion d'additif(s) pourra être comprise entre 0,5 et 10 % en masse dans le vernis 3, et mieux entre 1 et 6 %, par exemple entre 3 et 6 %.Typically, the proportion of additive (s) may be between 0.5 and 10% by weight in the varnish 3, and better between 1 and 6%, for example between 3 and 6%.

Comme additifs utilisables, on peut notamment citer ceux commercialisés par les sociétés GREAT LAKES et CIBA-GEIGY et notamment les dérivés de la famille des benzotriazoles.As additives that may be used, mention may be made especially of those sold by the companies GREAT LAKES and CIBA-GEIGY, and in particular derivatives of the benzotriazole family.

De tels dérivés peuvent être des hétérocycles de type cyclo-benzène, sur lesquels un atome de carbone a été remplacé.Such derivatives may be heterocycles of cyclo-benzene type, on which a carbon atom has been replaced.

A titre d'exemple de composé absorbeur d'UV, on peut citer celui de formule

Figure imgb0003
By way of example of a UV absorber compound, mention may be made of that of formula
Figure imgb0003

A titre d'exemple de capteur de radicaux libres, on peut citer celui de formule

Figure imgb0004
As an example of a free radical scavenger, mention may be made of that of formula
Figure imgb0004

Le ou les capteurs de radicaux libres utilisés peuvent être des amines à empêchement stérique AES ou encore des amines HALS.The free radical scavenger (s) used may be sterically hindered amines AES or HALS amines.

Le ou les capteurs de radicaux libres peuvent stabiliser le vernis et éviter son jaunissement propre.The free radical sensor (s) can stabilize the varnish and prevent its own yellowing.

La nature du vernis utilisé pourra dépendre du procédé d'impression et du mode de séchage retenus.The nature of the varnish used may depend on the selected printing process and drying method.

De préférence, on évitera les vernis offsets gras qui jaunissent naturellement par oxydation.Preferably, varnish offsets fat which yell naturally by oxidation will be avoided.

On peut utiliser un vernis à l'eau, de type acrylique, additionné d'un absorbeur d'UV et/ou d'un capteur de radicaux libres, par exemple additionné des deux composés dont les formules ont été données ci-dessus.It is possible to use a water-based, acrylic-type varnish supplemented with a UV absorber and / or a free radical scavenger, for example added with the two compounds whose formulas have been given above.

On pourra encore utiliser un vernis réticulable sous l'action d'un rayonnement ultraviolet, en évitant de préférence d'y incorporer des amines à empêchement stérique, lesquelles seraient annihilées partiellement par la réticulation du vernis.It is also possible to use a crosslinkable varnish under the action of ultraviolet radiation, preferably avoiding the inclusion of hindered amines, which would be partially annihilated by the crosslinking of the varnish.

Lorsqu'un vernis réticulable sous l'action d'un rayonnement ultraviolet est utilisé, ce vernis comporte par exemple au moins deux absorbeurs d'UV, par exemple chacun à une concentration inférieure à 3 % en poids, mieux inférieure ou égale à 2 %, dont les spectres d'absorption sont choisis de manière à ménager entre eux une plage de longueurs d'onde où les additifs absorbent moins et permettent à une source d'UV de provoquer la réticulation du vernis.When an ultraviolet-curable varnish is used, this varnish comprises, for example, at least two UV absorbers, for example each at a concentration of less than 3% by weight, better than or equal to 2%. whose absorption spectra are chosen so as to provide a range of wavelengths where the additives absorb less and allow a UV source to cause the crosslinking of the varnish.

L'un des additifs est par exemple à une concentration de 2 % et l'autre de 1 %, de manière à avoir une concentration totale inférieure ou égale à 3 %.One of the additives is for example at a concentration of 2% and the other of 1%, so as to have a total concentration of less than or equal to 3%.

A titre d'exemple, on a représenté à la figure 5 le spectre d'absorption d'un vernis (pour un trajet de 1 cm après dilution dans le toluène à 20 mg/l) comportant deux additifs dont les spectres d'absorption présentent des pics respectifs 10 et 11 ménageant entre eux une vallée dont le fond 12 est par exemple centré sur une longueur d'onde d'émission de la source utilisée pour réticuler le vernis, par exemple 320 nm.For example, there is shown in the figure 5 the absorption spectrum of a varnish (for a path of 1 cm after dilution in toluene at 20 mg / l) comprising two additives whose absorption spectra have respective peaks 10 and 11 between them a valley whose background 12 is for example centered on an emission wavelength of the source used to crosslink the varnish, for example 320 nm.

Les absorbeurs d'UV sont par exemple
un dérivé de triazine aromatique tel que celui commercialisé par la société CIBA sous la dénomination TINUVIN 400, de formule générale :

Figure imgb0005
et un dérivé de benzophénine tel que par exemple celui commercialisé par la société CIBA sous la référence CGL 477, de formule générale :
Figure imgb0006
 UV absorbers are for example
an aromatic triazine derivative such as that marketed by CIBA under the name TINUVIN 400, of general formula:
Figure imgb0005
 and a benzophenine derivative such as for example that marketed by CIBA under the reference CGL 477, of general formula:
Figure imgb0006

L'absorption minimale observée dans le fond 12 de la vallée est par exemple inférieure de plus de 30 % à l'absorption maximale Amax observée pour l'un des pics 10 et 11.The minimum absorption observed in the bottom 12 of the valley is, for example, less than 30% less than the maximum absorption A max observed for one of the peaks 10 and 11.

Le vernis peut comporter un colorant violet afin d'accroître la blancheur de la feuille, ce colorant étant par exemple à une concentration inférieure ou égale à 1 %.The varnish may comprise a violet dye in order to increase the whiteness of the sheet, this dye being for example at a concentration of less than or equal to 1%.

Pour mettre en évidence l'effet de protection vis-à-vis du jaunissement, conféré par un vernis 3 conforme à l'invention, on peut effectuer un test consistant à déposer une quantité prédéfinie, par exemple 6 g/m2, de vernis à l'eau humide sur une feuille de carton d'épaisseur totale 350 µm, puis exposer à une lampe à vapeur de mercure la feuille ainsi recouverte pendant une durée prédéfinie. La concentration d'additifs dans le vernis peut par exemple atteindre 5 % en masse. On peut utiliser un cylindre « Anilox » de volume au moins égal à 13 cm3 pour appliquer le vernis.To highlight the protective effect against yellowing, conferred by a varnish 3 according to the invention, it is possible to carry out a test consisting in depositing a predefined quantity, for example 6 g / m 2 , of varnish wet water on a sheet of cardboard with a total thickness of 350 μm, and then expose the sheet thus covered for a predefined period to a mercury vapor lamp. The concentration of additives in the varnish can for example reach 5% by weight. An "Anilox" cylinder with a volume of at least 13 cm 3 can be used to apply the varnish.

Le jaunissement est mesuré sur l'échelle de Laine, laquelle correspond à une échelle de bleus de tenue croissante à la lumière, normée de 1 à 8.Yellowing is measured on the Wool scale, which corresponds to a blue scale of increasing light intensity, standardized from 1 to 8.

En l'absence de vernis, le jaunissement mesuré peut par exemple atteindre sur l'échelle de Laine la valeur 3. En présence du vernis, le jaunissement mesuré peut passer à une valeur au moins égale à 4, ce qui met en évidence la résistance au jaunissement plus grande de la feuille de carton revêtue du vernis. Le passage de la valeur 3 à 4 correspond à un doublement de la durée de la stabilité à la lumière.In the absence of varnish, the measured yellowing can for example reach on the Wool scale the value 3. In the presence of the varnish, the yellowing measured can pass to a value at least equal to 4, which highlights the resistance greater yellowing of the cardboard sheet coated with varnish. The change from value 3 to 4 corresponds to a doubling of the duration of the light stability.

Dans le cas où le vernis est un vernis réticulable aux UV, on peut observer une augmentation de la blancheur au cours du temps liée à une réticulation du vernis se poursuivant dans le temps, lorsque l'exposition à la source artificielle pour provoquer la polymérisation n'a pas été suffisante pour polymériser au maximum le vernis.In the case where the varnish is a UV-crosslinkable varnish, an increase in whiteness can be observed over time linked to a curing of the varnish continuing over time, when the exposure to the artificial source to cause the polymerization n was not sufficient to polymerize the varnish as much as possible.

Bien entendu, l'invention n'est pas limitée aux exemples qui viennent d'être donnés et l'on peut notamment utiliser d'autres additifs que ceux cités.Of course, the invention is not limited to the examples which have just been given and it may in particular use other additives than those mentioned.

On peut également utiliser des feuilles de carton ayant des revêtements de surface de composition autre, voire des feuilles de carton sans revêtement de surface.It is also possible to use cardboard sheets having surface coatings of other composition, or even sheets of cardboard without surface coating.

Dans toute la description, y compris les revendications, l'expression « comportant un » devra être comprise comme étant synonyme de « comportant au moins un », sauf si le contraire est spécifié.Throughout the description, including the claims, the phrase "having one" should be understood as being synonymous with "having at least one" unless otherwise specified.

Par « compris entre », il faut comprendre bornes incluses, sauf spécifié autrement.By "between", it must be understood inclusive, unless otherwise specified.

Claims (45)

  1. Packaging comprising a cardboard sheet coated on its outside in a varnish (3) containing at least one additive for reducing the deterioration of the packaging under the effect of light.
  2. Packaging according to claim 1, characterized by the fact that the cardboard sheet includes conifer fibers.
  3. Packaging according to claim 2, characterized by the fact that the cardboard sheet includes more than 70%, better more than 80% by weight of conifer fibers.
  4. Packaging according to any one of claims 1 to 3, characterized by the fact that the additive absorbs a large fraction of light radiation at wavelengths lying in the range 290 nm to 460 nm.
  5. Packaging according to any one of claims 1 to 4, characterized by the fact that the cardboard sheet includes a surface coating (2),
  6. Packaging according to claim 5, characterized by the fact that the surface coating (2) is white.
  7. Packaging according to claim 5 or claim 6, characterized by the fact that the surface coating contains at least one optical bleach.
  8. Packaging according to claim 7, characterized by the fact that the optical bleach in the surface coating is at a concentration by weight lying in the range 0.05% to 0.5%.
  9. Packaging according to the preceding claim, characterized by the fact that the optical bleach is at a concentration lying in the range 0.1% to 0.3%.
  10. Packaging according to any one of claims 5 to 9, characterized by the fact that the surface coating (2) presents thickness lying in the range 20 µm to 30 µm,
  11. Packaging according to any one of claims 5 to 10 characterized by the fact that the surface coating (2) contains calcium carbonate.
  12. Packaging according to any one of claims 5 to 11, characterized by the fact that the surface coating (2) contains clay, in particular kaolin.
  13. Packaging according to the two immediately preceding claims, characterized by the fact that the surface coating (2) contains calcium carbonate and clay substantially in a 60/40 ratio by weight.
  14. Packaging according to any one of claims 5 to 13, characterized by the fact that the surface coating (2) contains starch.
  15. Packaging according to any preceding claim, characterized by the fact that the sheet weighs not less than 100 g/m2, and better not less than 190 g/m2, in particular not less than 200 g/m2.
  16. Packaging according to any preceding claim, characterized by the fact that the thickness of the varnish (3) lies in the range 2 µm to 20 µm.
  17. Packaging according to the preceding claim, characterized by the fact that the thickness of the varnish (3) lies in the range 3 µm to 12 µm.
  18. Packaging according to any preceding claim, characterized by the fact that, in the varnish (3), the additive is at a concentration by weight lying in the range 0.5% to 10%.
  19. Packaging according to the preceding claim, characterized by the fact that, in the varnish, the additive is at a concentration by weight lying in the range 3% to 6%.
  20. Packaging according to any preceding claim, characterized by the fact that the additive is a UV absorber compound.
  21. Packaging according to the preceding claim, characterized by the fact that the additive is a UV absorber having the following formula:
    Figure imgb0009
  22. Packaging according to any one of claims 1 to 17, characterized by the fact that the additive is a free-radical absorber compound.
  23. Packaging according to claim 22, characterized by the fact that the additive is a sterically-hindered amine or a HALS.
  24. Packaging according to claim 22, characterized by the fact that the additive is a free-radical absorber compound having the following formula:
    Figure imgb0010
  25. Packaging according to any preceding claim, characterized by the fact that the varnish (3) is a varnish that is cross-linkable under the action of UV radiation.
  26. Packaging according to claim 25, characterized by the fact that the varnish includes at least two ultraviolet absorbers having absorption spectra that are selected so as to form a range of wavelengths in which absorption is lower.
  27. Packaging according to any preceding claim, characterized by the fact that the varnish includes a violet dye.
  28. Packaging according to claim 26, characterized by the fact that the trough formed between the absorption peaks is substantially centered in the range 310 nm to 330 nm.
  29. Packaging according to any one of claims 1 to 24, characterized by the fact that the varnish is based on an aqueous solvent.
  30. Packaging according to the preceding claim, characterized by the fact that the varnish is an acrylic varnish.
  31. Packaging according to claim 1, characterized by the fact that the cardboard sheet is of the SBS type,
  32. Packaging according to any preceding claim, characterized by the fact that, before drying, the sheet is coated in approximately 3 g/m2 to 10 g/m2 of varnish (3).
  33. Packaging according to the preceding claim, characterized by the fact that the cardboard sheet is coated in approximately 6 g/m2 of varnish.
  34. Packaging according to any preceding claim, characterized by the fact that the varnish (3) covers printing (4) on the sheet.
  35. Packaging according to any one of claims 1 to 33, characterized by the fact that it includes printing (4) on the varnish (3),
  36. Packaging according to claim 1, characterized by the fact that the cardboard sheet has a base layer (1) including cellulose fibers, in particular coming from aspen wood.
  37. Packaging according to claim 1, characterized by the fact that the cardboard sheet includes lignin.
  38. Packaging according to any one of claims 1 to 35, characterized by the fact that the weight of the sheet is not greater than 320 g/m2.
  39. A method of manufacturing packaging comprising a cardboard sheet, in which method a varnish (3) is applied to the sheet, said varnish containing at least one additive for reducing the deterioration of the sheet under the effect of light.
  40. A method according to claim 39, characterized by the fact that the additive is a UV absorber compound and/or a free-radical absorber.
  41. A method according to any one of the two immediately preceding claims, characterized by the fact that the varnish (3) is applied by offset printing, by heliography, by flexography, or by silk-screen printing.
  42. A method according to claim 39 or claim 40, characterized by the fact that the sheet is printed prior to the varnish (3) being applied.
  43. A method according to claim 39 or claim 40, characterized by the fact that the sheet is printed after the varnish (3) has been applied.
  44. A method according to claim 39, characterized by the fact that the varnish is cross-linkable under the action of ultraviolet radiation, and includes at least two ultraviolet absorbers selected to have absorption spectra that are sufficiently far apart to form between them a range of wavelengths in which absorption is lower, and by the fact that a source emitting in this range is used to cause the varnish to cross-link.
  45. A method according to claim 39, characterized by the fact that the absorption peaks of the two additives are more than 40 nm apart, and form between them a trough in which the absorption low (Amin) is at least 30% below the maximum absorption (Amax) defined by one of the peaks.
EP05290493A 2004-03-05 2005-03-04 Package coated with a protection varnish against light Not-in-force EP1571258B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0450455A FR2867160B1 (en) 2004-03-05 2004-03-05 PACKAGING COATED WITH PROTECTIVE VARNISH AGAINST LIGHT
FR0450455 2004-03-05

Publications (2)

Publication Number Publication Date
EP1571258A1 EP1571258A1 (en) 2005-09-07
EP1571258B1 true EP1571258B1 (en) 2011-07-06

Family

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EP05290493A Not-in-force EP1571258B1 (en) 2004-03-05 2005-03-04 Package coated with a protection varnish against light

Country Status (7)

Country Link
EP (1) EP1571258B1 (en)
JP (1) JP4339812B2 (en)
CN (1) CN1663886B (en)
AT (1) ATE515597T1 (en)
BR (1) BRPI0500706A (en)
ES (1) ES2368920T3 (en)
FR (1) FR2867160B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008102822A1 (en) 2007-02-20 2008-08-28 Fujifilm Corporation Polymer material containing ultraviolet absorbent
EP2135911B1 (en) 2007-03-30 2014-05-28 FUJIFILM Corporation Ultraviolet ray absorber composition
CN101821273A (en) 2007-08-16 2010-09-01 富士胶片株式会社 Heterocyclic compound, ultraviolet ray absorbent, and composition comprising the ultraviolet ray absorbent
JP2009051543A (en) * 2007-08-28 2009-03-12 Toppan Printing Co Ltd Packaging material with ultraviolet protection
JP5244437B2 (en) 2008-03-31 2013-07-24 富士フイルム株式会社 UV absorber composition
JP5250289B2 (en) 2008-03-31 2013-07-31 富士フイルム株式会社 UV absorber composition
JP2009270062A (en) 2008-05-09 2009-11-19 Fujifilm Corp Ultraviolet absorbent composition

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Publication number Priority date Publication date Assignee Title
JPS6420421U (en) * 1987-07-24 1989-02-01
JP2710409B2 (en) * 1989-05-29 1998-02-10 東レ株式会社 Resin film and laminate for sack-laden containers
JPH05124673A (en) * 1991-10-07 1993-05-21 Shiseido Co Ltd Ultraviolet ray absorbing package
US5371058A (en) * 1992-06-10 1994-12-06 Alfred Doi Ultraviolet protective coatings for application to heat sensitive record materials and other photodegradable printed matter
US5922117A (en) * 1997-09-23 1999-07-13 Xerox Corporation Ink compositions containing alcohols
US6214995B1 (en) * 1998-12-22 2001-04-10 Richard F. Stockel Reactive hindered amine light stabilizers
US6632783B1 (en) * 2000-05-10 2003-10-14 Unilever Home & Personal Care Usa, A Division Of Conopco, Inc. Liquid detergent package with transparent/translucent bottle labels with UV absorbers
DE60110794T2 (en) * 2000-05-26 2005-10-06 Dow Global Technologies, Inc., Midland PELYETHYLENE-rich Mixtures with Polypropylene and Their Use
CA2425945C (en) * 2000-11-09 2010-01-26 3M Innovative Properties Company Weather resistant, ink jettable, radiation curable, fluid compositions particularly suitable for outdoor applications
FR2830257B1 (en) * 2001-10-02 2006-12-01 Bostik Findley METHOD FOR COLLABLY ASSEMBLING HYDROPHOBIC AND OLEOPHOBIC SUBSTRATES FOR PACKAGING
JP4350427B2 (en) * 2003-06-03 2009-10-21 株式会社クラレ Acrylic block copolymer composition
JP2005041770A (en) * 2003-07-09 2005-02-17 Ube Ind Ltd Polymer-cement composition
DE10333893A1 (en) * 2003-07-22 2005-02-10 Kompetenzzentrum Holz Gmbh Plastics and wood composites

Also Published As

Publication number Publication date
JP2006240734A (en) 2006-09-14
BRPI0500706A (en) 2006-06-06
ES2368920T3 (en) 2011-11-23
FR2867160A1 (en) 2005-09-09
ATE515597T1 (en) 2011-07-15
CN1663886A (en) 2005-09-07
FR2867160B1 (en) 2006-07-14
CN1663886B (en) 2012-04-11
JP4339812B2 (en) 2009-10-07
EP1571258A1 (en) 2005-09-07

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