EP1827800B1 - Decorated articles - Google Patents

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Publication number
EP1827800B1
EP1827800B1 EP05801765A EP05801765A EP1827800B1 EP 1827800 B1 EP1827800 B1 EP 1827800B1 EP 05801765 A EP05801765 A EP 05801765A EP 05801765 A EP05801765 A EP 05801765A EP 1827800 B1 EP1827800 B1 EP 1827800B1
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EP
European Patent Office
Prior art keywords
embossing roller
article
plastic
elastic material
embossing
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EP05801765A
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German (de)
French (fr)
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EP1827800A2 (en
Inventor
David Brull
Robert Frere
Jean-Pierre Mayeres
Emmanuel Noël
Denis Job
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NMC SA
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NMC SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F9/00—Designs imitating natural patterns
    • B44F9/02—Designs imitating natural patterns wood grain effects

Definitions

  • the present invention relates to a method of decorating plastic articles, in particular extruded and foamed plastic profiles, this decoration imitating in a particularly realistic manner the appearance of natural materials, for example that of wood.
  • Extruded and foamed plastic decorative profiles such as moldings, have an appeal due to their lightness compared to plaster moldings, wood or natural stone.
  • extrudable and foamable thermoplastics that can be used for this type of product, mention may be made, inter alia, of polystyrene plastics (PS crystal, HIPS, ABS, PS + PPO, etc.) and polyvinyl plastics, such as polyvinyl chloride (PVC).
  • Decorative wood moldings are generally used for door contours, skirting boards, picture rails, frames of pictures or paintings, etc. Available in various densities depending on the selected tree species, the real wood moldings must however be regularly maintained to maintain their attractive quality and appearance. We can not ignore the problem of natural wood resources, which are not infinite and although they are renewable, the cycles can be long and this can pose ecological problems in case of excessive demand.
  • Sawdust can be recovered from various processing industries and recycled into extrusion within a thermoplastic matrix (PP, PVC, HDPE, etc.), which gives the decorative profile a wood-like appearance but is not matching neither the texture nor the rendering of this noble material.
  • PP thermoplastic matrix
  • PVC polyvinylene
  • HDPE high density polyethylene
  • One method used by those skilled in the art is to cover decorative profiles foamed and extruded plastic film, imitating the appearance of wood, to make them more attractive and given to certain interiors.
  • the conventional method is to transfer on the visible side of the molding, after sufficient cooling thereof, a roll of plastic film on which is deposited a transferable ink (decal).
  • the operation is accomplished by the use of a roll of flexible material, silicone rubber most frequently.
  • the roller presses the film on the face of the PS foam profile to be decorated, and, with the help of heat, the paint is transferred perfectly to the profile. The smoother the surface beforehand (without streaks or defects), the better the result.
  • the sheet can be composed of one or more resins, or paper, colored with patterns in wood grain or containing particles, and can also be stamped beforehand or after coloring to create hollows and bumps, imitating the texture wood.
  • This ready-to-use sheet is applied by hot rolling or continuous gluing to the desired face of the decorative molding. Nevertheless, this process requires the use of adhesives specific, sometimes containing solvents, the latter may pose problems of handling and toxicity.
  • the methods of the state of the art all have at least one of the following disadvantages: they do not make it possible to obtain plastic profiles imitating not only the appearance, but also the texture of a natural material, they require several distinct and / or discontinuous steps, they require the use of special glues and / or toxic solvents, the quality of the finish is not satisfactory.
  • An object of the present invention is therefore to provide a simple, continuous method for decorating plastic articles both from the point of view of appearance and from the point of view of texture, for example to imitate realistic way of natural materials.
  • this object is achieved by a method according to claim 1.
  • the process in which said printing is carried out concomitantly with the embossing by the same embossing roll is characterized in that the roll is made of an elastic material and is heatable at the surface softening temperature. the plastic article.
  • the present method of decoration is simple while combining, in a single step, both the application of any pattern (printing), as the realization of a surface structure (embossing) on a plastic article. It also allows continuous work, thus ensuring a high flow and thus improved profitability.
  • the major advantage of the process is nevertheless the quality of the result obtained.
  • the implementation of the method of the invention for example for manufacturing profiles imitating wood, allows decorations with a much more realistic rendering.
  • the ink is perfectly applied and matches the relief created by the embossing roll, thus giving a sealed and resistant surface.
  • Another significant advantage of the present process is its versatility. Indeed, it is not only possible to vary almost infinitely the decorations, both in terms of the chosen pattern, as the level of the desired grain. It is also easily applicable to all kinds of articles, such as elongated profiles, but also articles with other aspect ratios, especially since it can be easily adapted for the decoration of several faces of the same article.
  • the process according to the invention does not require the use of toxic solvents or that of specific adhesives and generates practically no waste, which reduces investment and operating costs and therefore production costs.
  • the embossing roll of elastic material may, in principle, be made of any sufficiently flexible material to avoid shearing of the ink film.
  • the elastic material of the roll will preferably be of the elastomer type, having a temperature resistance sufficient to not deform in the temperature range to which it must be heated.
  • Silicone rubbers possess the ideal properties of resilience, temperature resistance and hardness to satisfy these criteria; they are commonly used in the industry for these properties. Therefore, a particularly suitable material is silicone rubber.
  • the hardness of the elastic material of the embossing roll although chosen according to other parameters of the process, such as the nature of the ink film, the nature of the plastic material of the article, etc. In other words, this hardness will be chosen according to the ease of obtaining the effects of ribs and is generally between 40 and 90 shore A, preferably between 60 and 80 shore A.
  • the relief such as streaks
  • various methods well known to those skilled in the art are available. For example, it is possible to mill the surface, or to form the material by molding in a mold having surface streaks, which will be negatively printed in the plastic during cooking.
  • the decoration can thus be varied at will, for example by using a relief imitating the ribbings of the wood, the grain of natural stones or any geometrical structures, it is enough to change the roller of embossing and / or the pattern of the transferable ink film.
  • Transferable ink films are conventional films known to those skilled in the art, for example: bottle, automobile, graphic industry in general, etc.
  • the temperature at which the elastic material of the embossing roll is preheated and the pressure with which the roll is applied to transfer the ink to the profile will be adapted to cause sufficient softening at the surface of the plastic profile so that the Streaks print in negative and the decorative ink is transferred correctly.
  • the parameters that may influence the choice of this temperature and this pressure are, among others, the nature of the polymer used, the density and the surface hardness of the foamed profile. It is remarkable that these temperature and pressure conditions are outside the usual values recommended by embossing roll manufacturers for these applications; generally work in milder conditions than those of the present invention, because the materials to be ribbed are usually malleable or made such (paints, inks, soft coatings deposited on the surface of the moldings).
  • the surface softening temperature is between 160 and 200 ° C, preferably between 170 and 180 ° C.
  • the heating of the embossing roll can in principle be carried out by any means making it possible to maintain the surface of the groove of this roll at the surface softening temperature of the articles to be decorated, preferably by means of a heating device separated by external radiation.
  • the plastic articles usable in the present process are conventional extruded and foamed articles usable in this field.
  • the processes for producing thermoplastic foams or not by extrusion are known to those skilled in the art. Extrusion has an obvious productivity advantage.
  • thermoplastics are preferably made of thermoplastics, for a possibility of recycling.
  • the selected polymers will advantageously have sufficient mechanical strength, to ensure acceptable rigidity especially if cutting lengths of several meters.
  • Polymers meeting these criteria include, but are not limited to, optionally modified thermoplastic (co) polymers, such as polystyrene (PS) crystal, impact polystyrene (HIPS), poly (styrene-acrylonitrile) (SAN), poly (acrylonitrile) -butadiene-stryrene) (ABS) and polyvinyl chloride (PVC), as well as their mixtures, optionally combined with other thermoplastic polymers, such as, for example, polyphenylene oxide (PPO), such as Noryl ( PS + PPO). Crystal polystyrene is a particularly suitable polymer for the manufacture of light and resistant decorative moldings.
  • the density of the foamed profiles that can be decorated by the process of the present invention can vary from 60 to 700 kg / m 3 , preferably from 150 to 400 kg / m 3 .
  • the present invention also provides the use of a method or an apparatus for the continuous production of a decoration on at least one face of extruded and foamed plastic articles in a single step as described herein. above, especially for the production of moldings, skirting boards, picture rails and decorated frames.
  • the Fig. 1 is a block diagram of an embodiment of a decorating apparatus according to the invention.
  • the decoration apparatus comprises an embossing roll 2 made for example of silicone rubber and held on top of a conveyor device or against a roller.
  • the groove of the embossing roll 2 is provided with a relief representing, in negative, the grain that it is desired to give to the surface 10 of the article 1.
  • a radiation heater 3 is placed above the roller 2 so as to heat its groove to the surface softening temperature of the article 1.
  • the apparatus further comprises a transferable ink film 11 from a reel 4 and passed between the embossing roll 2 and the article 1 and rewound onto the rewind roller 5 after the operation.
  • the decoration operation of the surface 10 of the article 1 comprises firstly the embossing of the surface so as to create a texture and secondly the impression of the same surface of a decorative pattern.
  • the plastic article 1 for example crystal polystyrene
  • the roll 2 can be adjusted in height by so as to be able to adapt the pressure exerted by the roller on the film 11 and the surface 10 of the article 1. Due to the heat of the roll 2, the surface 10 is simultaneously embossed by the relief and printed by the ink of the film 11 to give a surface 10 'having the decoration, that is to say the pattern and the texture, chosen.
  • the film 11 is rewound after use on the roll 5.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Printing Methods (AREA)
  • Materials For Medical Uses (AREA)
  • Laminated Bodies (AREA)

Abstract

The procedure for decorating at least one surface (10') of a plastic strip (1) that has been extruded and foamed in a single stage, in which the surface is embossed and printed with transferable ink on a film (11), has the printing carried out at the same time as embossing, using an embossing roller of an elastic material that is heated to the temperature at which the surface of the plastic strip is softened, preferably between 170 and 180 degrees C. The process is carried out by a transporter, an embossing roller (2), a heater (3), and feed and take-up rollers (4, 5) for the inked film (11).

Description

Domaine techniqueTechnical area

La présente invention concerne un procédé de décoration d'articles en matière plastique, en particulier de profilés de plastique extrudé et moussé, cette décoration imitant de manière particulièrement réaliste l'aspect de matériaux naturels, par exemple celui du bois.The present invention relates to a method of decorating plastic articles, in particular extruded and foamed plastic profiles, this decoration imitating in a particularly realistic manner the appearance of natural materials, for example that of wood.

Etat de la techniqueState of the art

Les profilés décoratifs de plastique extrudés et moussés, comme les moulures, possèdent un attrait dû à leur légèreté par rapport aux moulures de plâtre, de bois ou de pierre naturelle. Parmi les thermoplastiques extrudables et moussables utilisables pour ce type de produits, on peut citer entre autres les plastiques polystyréniques (PS cristal, HIPS, ABS, PS+PPO, ...) et polyvinyliques, tels que le polychlorure de vinyle (PVC).Extruded and foamed plastic decorative profiles, such as moldings, have an appeal due to their lightness compared to plaster moldings, wood or natural stone. Among the extrudable and foamable thermoplastics that can be used for this type of product, mention may be made, inter alia, of polystyrene plastics (PS crystal, HIPS, ABS, PS + PPO, etc.) and polyvinyl plastics, such as polyvinyl chloride (PVC).

Les moulures décoratives en bois sont généralement utilisées pour des contours de portes, des plinthes, des cimaises, les encadrements d'images ou de tableaux, etc. Disponibles en diverses densités selon les essences d'arbre choisies, les moulures en bois véritable doivent cependant être entretenue régulièrement pour conserver leur qualité et aspect attractifs. On ne peut ignorer la problématique des ressources naturelles de bois, qui ne sont pas infinies et bien qu'elles soient renouvelables, les cycles peuvent être longs et ceci peut poser des problèmes écologiques en cas de demande démesurée.Decorative wood moldings are generally used for door contours, skirting boards, picture rails, frames of pictures or paintings, etc. Available in various densities depending on the selected tree species, the real wood moldings must however be regularly maintained to maintain their attractive quality and appearance. We can not ignore the problem of natural wood resources, which are not infinite and although they are renewable, the cycles can be long and this can pose ecological problems in case of excessive demand.

On peut récupérer la sciure de bois de diverses industries de transformation et la recycler en extrusion au sein d'une matrice thermoplastique (PP, PVC, HDPE, ...), ce qui confère au profilé décoratif un aspect tendant vers le bois mais n'égalant ni la texture, ni le rendu de ce matériau noble.Sawdust can be recovered from various processing industries and recycled into extrusion within a thermoplastic matrix (PP, PVC, HDPE, etc.), which gives the decorative profile a wood-like appearance but is not matching neither the texture nor the rendering of this noble material.

Un procédé employé par l'homme de métier consiste à recouvrir des profilés décoratifs en matière plastique moussée et extrudée d'un film, présentant une imitation de l'aspect du bois, afin de les rendre plus attractifs et accordés à certains intérieurs. Le procédé classique consiste à transférer sur la face visible de la moulure, après refroidissement suffisant de celle-ci, un rouleau de film de matière plastique sur lequel est déposé une encre transférable (décalcomanie). L'opération est accomplie par l'utilisation d'un rouleau en matériau souple, caoutchouc silicone le plus fréquemment. Le rouleau presse le film sur la face du profilé de mousse PS à décorer, et, la chaleur aidant, la peinture se transfère parfaitement sur le profil. Plus la surface est lisse au préalable (sans stries ni défauts), meilleur sera le résultat.One method used by those skilled in the art is to cover decorative profiles foamed and extruded plastic film, imitating the appearance of wood, to make them more attractive and given to certain interiors. The conventional method is to transfer on the visible side of the molding, after sufficient cooling thereof, a roll of plastic film on which is deposited a transferable ink (decal). The operation is accomplished by the use of a roll of flexible material, silicone rubber most frequently. The roller presses the film on the face of the PS foam profile to be decorated, and, with the help of heat, the paint is transferred perfectly to the profile. The smoother the surface beforehand (without streaks or defects), the better the result.

Le résultat obtenu consiste en un recouvrement parfaitement lisse et plat, présentant une imitation des couleurs de veines de bois. Cependant, cette configuration occasionne un effet de "brillance plastique" très distinct de l'effet de relief d'une vraie moulure en bois.The result is a perfectly smooth and flat overlap, imitating the colors of wood grain. However, this configuration causes a "plastic shine" effect very distinct from the relief effect of a real wooden molding.

Une possibilité pour accroître le réalisme du rendu de l'aspect bois, est de presser le film d'encre imitation veines de bois sur la face de la moulure, mais en introduisant des nervurations, c'est-à-dire que la surface du profil ne sera plus plane, mais creusée ça et là de canaux par exemples, que la peinture devra épouser le mieux possible. La lumière éclairant la face ainsi décorée ne sera plus renvoyée de manière uniforme, il y aura des "ombres" qui rendent plus fidèlement les imperfections présentes sur une moulure en bois. L'obtention de ces nervures ou canaux peut se faire dans une presse haute pression, en discontinu. Le brevet US 2,404,073 présente un procédé de décoration d'articles en matière plastique de ce type. One possibility to increase the realism of the rendering of the wood look, is to press the imitation ink film veins of wood on the face of the molding, but by introducing ribbings, that is to say that the surface of the profile will not be flat, but hollowed here and there of channels for example, that the painting will have to marry the best possible. The light illuminating the face thus decorated will not be returned in a uniform way, there will be "shadows" that more accurately reflect the imperfections present on a wooden molding. Obtaining these ribs or channels can be done in a high pressure press, batchwise. The patent US 2,404,073 presents a method of decorating plastic articles of this type.

Lorsqu'on désire appliquer en continu cette modification avantageuse de l'aspect de l'encre à effet bois en utilisant un rouleau de métal présentant dans sa gorge des stries et canaux, et qu'on applique le rouleau chauffé en le pressant sur le film de peinture à transférer, la peinture ne garde pas son intégrité et s'écaille aux endroits qui ne sont pas parfaitement plats; le résultat est insatisfaisant.When it is desired to continuously apply this advantageous modification of the appearance of the wood effect ink by using a metal roller having in its groove streaks and channels, and that the heated roller is applied by pressing it on the film paint transfer, the painting does not keep its integrity and flakes to place s that are not perfectly flat; the result is unsatisfactory.

II est également connu de procéder au recouvrement d'une surface visible d'un profilé de plastique extrudé, destiné à la décoration, par une feuille présentant une imitation de l'aspect du bois. La feuille peut être composée d'une ou plusieurs résines, ou de papier, colorés avec des motifs en veines de bois ou contenant des particules, et peut également être emboutit au préalable ou après coloration afin de créer des creux et bosses, imitant la texture du bois. On applique cette feuille prête à l'emploi par laminage à chaud ou par collage en continu sur la face voulue de la moulure décorative. Néanmoins, ce procédé requiert l'usage d'adhésifs spécifiques, contenant parfois des solvants, ces derniers pouvant poser des problèmes de manutention et de toxicité.It is also known to proceed to the covering of a visible surface of an extruded plastic profile, intended for decoration, with a sheet having an imitation of the appearance of the wood. The sheet can be composed of one or more resins, or paper, colored with patterns in wood grain or containing particles, and can also be stamped beforehand or after coloring to create hollows and bumps, imitating the texture wood. This ready-to-use sheet is applied by hot rolling or continuous gluing to the desired face of the decorative molding. Nevertheless, this process requires the use of adhesives specific, sometimes containing solvents, the latter may pose problems of handling and toxicity.

Un autre procédé original est décrit dans WO 99/28114 (ROBOBOND LIMITED) consistant à peindre une surface à décorer de la moulure extrudée en continu, d'appliquer, par pressage à l'aide d'un rouleau sur la peinture encore humide et malléable, un film temporaire de papier ou de plastique déroulé en continu, le rouleau de plastique malléable ou de métal pouvant posséder des motifs gravés. Le film temporaire est ré-enroulé par après, laissant sur la surface la peinture nervurée qui est finalement séchée. Le film temporaire est avantageusement chiffonné au préalable pour accroître le rendu de l'aspect bois. Ce procédé altère sélectivement l'épaisseur de la peinture déposée, ce qui a pour désavantage de diminuer la résistance au grattage et à l'écaillage de cette couche de peinture vu son épaisseur variable. De plus, cette méthode comporte plusieurs étapes à contrôler attentivement et ne permet pas la création de motifs fins et complexes.Another original process is described in WO 99/28114 (ROBOBOND LIMITED) of painting a surface to decorate the extruded molding continuously, to apply, by pressing with a roller on the still wet and malleable paint, a temporary film of paper or plastic unrolled continuous, the malleable plastic or metal roller may have engraved patterns. The temporary film is re-wound afterwards, leaving on the surface the ribbed paint which is finally dried. The temporary film is advantageously crumpled beforehand to increase the rendering of the wood appearance. This process selectively alters the thickness of the deposited paint, which has the disadvantage of reducing the resistance to scraping and peeling of this layer of paint because of its variable thickness. In addition, this method has several steps to control carefully and does not allow the creation of fine and complex patterns.

En résumé, les procédés de l'état de la technique présentent tous au moins un des désavantages suivants : ils ne permettent pas d'obtenir des profilés en matière plastique imitant non seulement l'apparence, mais également la texture d'un matériau naturel, ils nécessitent plusieurs étapes distinctes et/ou discontinues, ils requièrent l'emploi de colles spéciales et/ou de solvants toxiques, la qualité de la finition n'est pas satisfaisante.In summary, the methods of the state of the art all have at least one of the following disadvantages: they do not make it possible to obtain plastic profiles imitating not only the appearance, but also the texture of a natural material, they require several distinct and / or discontinuous steps, they require the use of special glues and / or toxic solvents, the quality of the finish is not satisfactory.

Objet de l'inventionObject of the invention

Un objet de la présente invention est par conséquent de proposer un procédé simple, continu, permettant la décoration d'articles en matière plastique tant du point de vue de l'aspect, que du point de vue de la texture, par exemple pour imiter de manière réaliste des matériaux naturels.An object of the present invention is therefore to provide a simple, continuous method for decorating plastic articles both from the point of view of appearance and from the point of view of texture, for example to imitate realistic way of natural materials.

Conformément à l'invention, cet objectif est atteint par un procédé selon la revendication 1.According to the invention, this object is achieved by a method according to claim 1.

Description générale de l'inventionGeneral description of the invention

Afin de résoudre le problème mentionné ci-dessus, la présente invention propose un procédé pour la réalisation en continu d'une décoration sur au moins une face d'articles en matière plastique extrudée et moussée en une seule étape, ladite étape comprenant :

  • l'embossage de la au moins une face de l'article par le passage de l'article sous un rouleau d'embossage pourvu d'une gorge à relief et
  • l'impression de la au moins une face de l'article par le transfert d'une encre à partir d'un film composite à encre transférable.
In order to solve the problem mentioned above, the present invention proposes a method for the continuous realization of a decoration on at least an extruded and foamed plastic article face in a single step, said step comprising:
  • embossing the at least one face of the article by the passage of the article under an embossing roll provided with a relief groove and
  • printing the at least one face of the article by transferring ink from a transferable ink composite film.

Le procédé dans lequel ladite impression est 1 réalisée de manière concomitante à l'embossage par le même rouleau d'embossage, est caractérisé par le fait que le rouleau est fait d'une matière élastique et est chauffable à la température de ramollissement en surface de l'article en matière plastique.The process in which said printing is carried out concomitantly with the embossing by the same embossing roll, is characterized in that the roll is made of an elastic material and is heatable at the surface softening temperature. the plastic article.

Le présent procédé de décoration est simple tout en combinant, en une seule étape, tant l'application d'un motif quelconque (impression), que la réalisation d'une structure superficielle (embossage) sur un article en matière plastique. Il permet en outre de travailler en continu, assurant ainsi un débit important et de ce fait une rentabilité améliorée.The present method of decoration is simple while combining, in a single step, both the application of any pattern (printing), as the realization of a surface structure (embossing) on a plastic article. It also allows continuous work, thus ensuring a high flow and thus improved profitability.

L'atout majeur du procédé est néanmoins la qualité du résultat obtenu. D'une part, la mise en oeuvre du procédé de l'invention, par exemple pour la fabrications de profilés imitant le bois, permet des décorations avec un rendu beaucoup plus réaliste. D'autre part, grâce à ce procédé, l'encre s'applique parfaitement et épouse le relief créé par le rouleau d'embossage, donnant ainsi une surface scellée et résistante.The major advantage of the process is nevertheless the quality of the result obtained. On the one hand, the implementation of the method of the invention, for example for manufacturing profiles imitating wood, allows decorations with a much more realistic rendering. On the other hand, thanks to this process, the ink is perfectly applied and matches the relief created by the embossing roll, thus giving a sealed and resistant surface.

Un autre avantage non négligeable du présent procédé est sa versatilité. En effet, il est non seulement possible de varier quasi à l'infini les décorations, tant au niveau du motif choisi, qu'au niveau du grain souhaité. Il est en outre facilement applicable à toutes sortes d'articles, comme par exemple des profilés allongés, mais également des articles avec d'autres rapports de forme, d'autant plus qu'il peut être adapté aisément pour la décoration de plusieurs faces d'un même article.Another significant advantage of the present process is its versatility. Indeed, it is not only possible to vary almost infinitely the decorations, both in terms of the chosen pattern, as the level of the desired grain. It is also easily applicable to all kinds of articles, such as elongated profiles, but also articles with other aspect ratios, especially since it can be easily adapted for the decoration of several faces of the same article.

Enfin, le procédé selon l'invention ne nécessite ni l'utilisation de solvants toxiques, ni celle d'adhésifs spécifiques et ne génère pratiquement pas de déchets, ce qui réduit les investissements et les frais de fonctionnement et donc les coûts de production.Finally, the process according to the invention does not require the use of toxic solvents or that of specific adhesives and generates practically no waste, which reduces investment and operating costs and therefore production costs.

Nous avons trouvé, de manière contre-intuitive et à l'encontre de l'avis des firmes spécialisées dans ce type de procédé de décoration, qu'en utilisant un rouleau d'embossage en matière flexible relativement souple présentant un relief, comme par exemple des stries et canaux longitudinaux sur tout le périmètre et la largeur de la gorge, le film d'encre s'applique parfaitement et épouse les canaux créés à la surface du profil, sans cisaillement du film et sans risque d'écaillage ultérieur.We have found, counter-intuitively and against the advice of specialized firms in this type of decoration process, that using a relatively flexible flexible material embossing roller with a relief, such as streaks and longitudinal channels all around the perimeter and the width of the groove, the ink film perfectly applies and matches the channels created on the surface of the profile, without shearing the film and without risk of subsequent flaking.

Le choix de la matière élastique et souple qui pressera le film composite comportant l'encre transférable, ainsi que les conditions de procédé (température de chauffage et pression d'application) sont déterminants pour l'obtention de l'effet attractif.The choice of the elastic and flexible material which will press the composite film comprising the transferable ink, as well as the process conditions (heating temperature and application pressure) are decisive for obtaining the attractive effect.

Le rouleau d'embossage en matière élastique peut, en principe, être réalisée en toute matière suffisamment souple pour éviter le cisaillement du film d'encre. La matière élastique du rouleau sera préférablement du type élastomère, devant posséder une résistance en température suffisante pour ne pas se déformer dans la gamme de température à laquelle on doit la chauffer. Les caoutchoucs silicones possèdent les propriétés idéales de résilience, de résistance en température et de dureté pour satisfaire ces critères ; ils sont couramment utilisés dans l'industrie pour ces propriétés. Par conséquent, une matière particulièrement appropriée est le caoutchouc silicone.The embossing roll of elastic material may, in principle, be made of any sufficiently flexible material to avoid shearing of the ink film. The elastic material of the roll will preferably be of the elastomer type, having a temperature resistance sufficient to not deform in the temperature range to which it must be heated. Silicone rubbers possess the ideal properties of resilience, temperature resistance and hardness to satisfy these criteria; they are commonly used in the industry for these properties. Therefore, a particularly suitable material is silicone rubber.

La dureté de la matière élastique du rouleau d'embossage, bien que choisie en fonction des autres paramètres du procédé, tels que la nature du film d'encre, la nature de la matière plastique de l'article, etc. Autrement dit, cette dureté sera choisie en fonction de la facilité d'obtention des effets de nervures et se situe en général entre 40 et 90 shore A, de préférence entre 60 et 80 shore A.The hardness of the elastic material of the embossing roll, although chosen according to other parameters of the process, such as the nature of the ink film, the nature of the plastic material of the article, etc. In other words, this hardness will be chosen according to the ease of obtaining the effects of ribs and is generally between 40 and 90 shore A, preferably between 60 and 80 shore A.

Pour obtenir le relief, tel que des stries, sur la matière élastique et souple du rouleau servant à la décoration de la surface de la moulure plastique, divers procédés bien connus de l'homme de métier sont disponibles. On peut par exemple opérer un fraisage de la surface, ou bien former la matière par moulage dans un moule comportant des stries en surface, qui s'imprimeront en négatif dans la matière plastique durant sa cuisson. Comme nous l'avons déjà mentionné ci-dessus, la décoration peut ainsi être variée à volonté, par exemple en utilisant un relief imitant les nervurations du bois, le grain de pierres naturelles ou des structures géométriques quelconques, il suffit de changer le rouleau d'embossage et/ou le motif du film d'encre transférable.To obtain the relief, such as streaks, on the elastic and flexible material of the roller used for decorating the surface of the plastic molding, various methods well known to those skilled in the art are available. For example, it is possible to mill the surface, or to form the material by molding in a mold having surface streaks, which will be negatively printed in the plastic during cooking. As already mentioned above, the decoration can thus be varied at will, for example by using a relief imitating the ribbings of the wood, the grain of natural stones or any geometrical structures, it is enough to change the roller of embossing and / or the pattern of the transferable ink film.

Les films à encre transférable sont des films conventionnels connus des hommes de métier, par exemple : bouteille, automobile, industrie graphique en général, ...Transferable ink films are conventional films known to those skilled in the art, for example: bottle, automobile, graphic industry in general, etc.

La température à laquelle on préchauffe la matière élastique du rouleau d'embossage et la pression avec laquelle on applique ce rouleau pour transférer l'encre sur le profil, seront adaptées de manière à occasionner le ramollissement suffisant en surface du profil plastique, afin que les stries s'impriment en négatif et que l'encre décorative s'y transfère correctement. Les paramètres pouvant influencer le choix de cette température et de cette pression sont, entre autres, la nature du polymère utilisé, la densité et la dureté de surface du profil moussé. Il est remarquable que ces conditions de température et de pression sortent du cadre des valeurs habituelles préconisées par les fabricants de rouleaux d'embossage pour ces applications ; on travaille généralement dans des conditions plus douces que celles de la présente invention, car les matières à nervurer sont le plus souvent malléables ou rendues telles (peintures, encres, revêtements souples déposés en surface des moulures). D'une manière générale, la température de ramollissement en surface se situe entre 160 et 200 °C, de préférence entre 170 et 180 °C.The temperature at which the elastic material of the embossing roll is preheated and the pressure with which the roll is applied to transfer the ink to the profile will be adapted to cause sufficient softening at the surface of the plastic profile so that the Streaks print in negative and the decorative ink is transferred correctly. The parameters that may influence the choice of this temperature and this pressure are, among others, the nature of the polymer used, the density and the surface hardness of the foamed profile. It is remarkable that these temperature and pressure conditions are outside the usual values recommended by embossing roll manufacturers for these applications; generally work in milder conditions than those of the present invention, because the materials to be ribbed are usually malleable or made such (paints, inks, soft coatings deposited on the surface of the moldings). In general, the surface softening temperature is between 160 and 200 ° C, preferably between 170 and 180 ° C.

La mise à température du rouleau d'embossage peut en principe se faire par tout moyen permettant de maintenir la surface de la gorge de ce rouleau à la température de ramollissement en surface des articles à décorer, de préférence au moyen d'un dispositif de chauffage séparé par radiation extérieure.The heating of the embossing roll can in principle be carried out by any means making it possible to maintain the surface of the groove of this roll at the surface softening temperature of the articles to be decorated, preferably by means of a heating device separated by external radiation.

Les articles en matière plastique utilisables dans le présent procédé sont des articles extrudés et moussés conventionnels utilisables dans ce domaine. Les procédés de fabrication des mousses thermoplastiques ou non par extrusion sont connus de l'homme de métier. L'extrusion présente un avantage de productivité évident.The plastic articles usable in the present process are conventional extruded and foamed articles usable in this field. The processes for producing thermoplastic foams or not by extrusion are known to those skilled in the art. Extrusion has an obvious productivity advantage.

Ces articles, le plus généralement des profilés de plastique extrudé et moussé, sont faits de matières thermoplastiques de préférence, pour une possibilité de recyclage. Les polymères retenus auront avantageusement une résistance mécanique suffisante, afin de garantir une rigidité acceptable surtout si on découpe des longueurs de plusieurs mètres. Parmi les polymères répondant à ces critères, citons entre autres les (co)polymères thermoplastiques éventuellement modifiés, tels que le polystyrène (PS) cristal, polystyrène choc (HIPS), le poly(styrène-acrylonitrile) (SAN), le poly(acrylonitrile-butadiène-stryrène) (ABS) et le polychlorure de vinyle (PVC), ainsi que leurs mélanges, éventuellement combinés à d'autres polymères thermoplastiques, tels que par exemple le poly(oxyde de phénylène) (PPO), comme le Noryl (PS + PPO). Le polystyrène cristal est un polymère particulièrement bien adapté à la fabrication de moulures décoratives légères et résistantes.These articles, most commonly extruded and foamed plastic profiles, are preferably made of thermoplastics, for a possibility of recycling. The selected polymers will advantageously have sufficient mechanical strength, to ensure acceptable rigidity especially if cutting lengths of several meters. Polymers meeting these criteria include, but are not limited to, optionally modified thermoplastic (co) polymers, such as polystyrene (PS) crystal, impact polystyrene (HIPS), poly (styrene-acrylonitrile) (SAN), poly (acrylonitrile) -butadiene-stryrene) (ABS) and polyvinyl chloride (PVC), as well as their mixtures, optionally combined with other thermoplastic polymers, such as, for example, polyphenylene oxide (PPO), such as Noryl ( PS + PPO). Crystal polystyrene is a particularly suitable polymer for the manufacture of light and resistant decorative moldings.

La densité des profils moussés que l'on peut décorer grâce au procédé de la présente invention peut varier de 60 à 700 kg/m3, de préférence entre 150 et 400 kg/m3.The density of the foamed profiles that can be decorated by the process of the present invention can vary from 60 to 700 kg / m 3 , preferably from 150 to 400 kg / m 3 .

Un autre objet de la présente invention concerne un appareil de décoration d'articles en matière plastique extrudée et moussée en une seule étape, ledit appareil comprenant :

  • un dispositif de transport pour l'introduction des articles en matière plastique,
  • un rouleau d'embossage pourvu d'une gorge à relief,
  • un dispositif de chauffage pour chauffer le rouleau d'embossage,
  • un rouleau dévidoir et un rouleau de rembobinage pour un film composite à encre transférable,
dans lequel l'article en matière plastique est déplacé par les moyens de transport sous le rouleau d'embossage tournant à la vitesse de déplacement de l'article en matière plastique, ledit film composite à encre transférable provenant du rouleau dévidoir étant passé entre l'article en matière plastique et le rouleau d'embossage, le rouleau étant fait d'une matière élastique et étant chauffé à la température de ramollissement en surface de l'article en matière plastique.Another object of the present invention is an apparatus for decorating extruded and foamed plastic articles in a single step, said apparatus comprising:
  • a transport device for the introduction of plastic articles,
  • an embossing roll provided with a relief groove,
  • a heating device for heating the embossing roll,
  • a reel roll and a rewind roll for a transferable ink composite film,
wherein the plastic article is moved by the conveying means under the embossing roll rotating at the moving speed of the plastic article, said transferable ink composite film from the reel being passed between the plastic article and the embossing roll, the roll being made of an elastic material and being heated to the surface softening temperature of the plastic article.

Finalement, la présente invention prévoit aussi l'utilisation d'un procédé ou d'un appareil pour la réalisation en continu d'une décoration sur au moins une face d'articles en matière plastique extrudée et moussée en une seule étape tels que décrits ci-dessus, en particulier pour la production de moulures, de plinthes, de cimaises et d'encadrements décorés.Finally, the present invention also provides the use of a method or an apparatus for the continuous production of a decoration on at least one face of extruded and foamed plastic articles in a single step as described herein. above, especially for the production of moldings, skirting boards, picture rails and decorated frames.

Il est évidemment possible de soumettre les articles à des traitements supplémentaires avant ou après le présent procédé, par exemple la découpe des profilés, etc. et, bien que généralement non nécessaires, d'autres étapes de finition.It is obviously possible to subject the articles to additional treatments before or after the present process, for example the cutting of profiles, etc. and, although generally unnecessary, other finishing steps.

Brève description des dessinsBrief description of the drawings

D'autres particularités et caractéristiques de l'invention ressortiront de la description détaillée de quelques modes de réalisation avantageux présentés ci-dessous, à titre d'illustration, en se référant au dessin annexé :Other features and characteristics of the invention will emerge from the detailed description of some advantageous embodiments presented below, by way of illustration, with reference to the appended drawing:

La Fig. 1 est un schéma de principe d'un mode réalisation d'un appareil de décoration selon l'invention.The Fig. 1 is a block diagram of an embodiment of a decorating apparatus according to the invention.

Description d'une exécution préféréeDescription of a preferred execution

L'appareil de décoration comprend un rouleau d'embossage 2 fait par exemple en caoutchouc silicone et maintenu au-dessus d'un dispositif convoyeur ou d'un contre-rouleau. La gorge du rouleau d'embossage 2 est pourvue d'un relief représentant, en négatif, le grain que l'on souhaite donner à la surface 10 de l'article 1.The decoration apparatus comprises an embossing roll 2 made for example of silicone rubber and held on top of a conveyor device or against a roller. The groove of the embossing roll 2 is provided with a relief representing, in negative, the grain that it is desired to give to the surface 10 of the article 1.

Un dispositif de chauffage 3 par radiation est placé au-dessus du rouleau 2 de manière à chauffer sa gorge à la température de ramollissement en surface de l'article 1.A radiation heater 3 is placed above the roller 2 so as to heat its groove to the surface softening temperature of the article 1.

L'appareil comprend en outre un film à encre transférable 11 provenant d'un rouleau dévidoir 4 et qui est passé entre le rouleau d'embossage 2 et l'article 1 et rembobiné sur le rouleau de rembobinage 5 après l'opération.The apparatus further comprises a transferable ink film 11 from a reel 4 and passed between the embossing roll 2 and the article 1 and rewound onto the rewind roller 5 after the operation.

L'opération de décoration de la surface 10 de l'article 1 comporte d'une part l'embossage de la surface de manière à y créer une texture et d'autre part l'impression de cette même surface d'un motif décoratif. Pour ce faire, l'article en matière plastique 1, par exemple en polystyrène cristal, est introduit dans l'appareil de décoration et passé en dessous du rouleau d'embossage 2 et du film 11. Le rouleau 2 pouvant être réglé en hauteur de manière à pouvoir adapter la pression exercée par le rouleau sur le film 11 et la surface 10 de l'article 1. Dû à la chaleur du rouleau 2, la surface 10 est simultanément embossé par le relief et imprimé par l'encre du film 11 pour donner une surface 10' possédant la décoration, c'est-à-dire le motif et la texture, choisie. Le film 11 est rembobiné après usage sur le rouleau 5.The decoration operation of the surface 10 of the article 1 comprises firstly the embossing of the surface so as to create a texture and secondly the impression of the same surface of a decorative pattern. To do this, the plastic article 1, for example crystal polystyrene, is introduced into the decorating apparatus and passed below the embossing roll 2 and the film 11. The roll 2 can be adjusted in height by so as to be able to adapt the pressure exerted by the roller on the film 11 and the surface 10 of the article 1. Due to the heat of the roll 2, the surface 10 is simultaneously embossed by the relief and printed by the ink of the film 11 to give a surface 10 'having the decoration, that is to say the pattern and the texture, chosen. The film 11 is rewound after use on the roll 5.

Claims (11)

  1. Method for the continuous realisation of a decoration on at least one surface of extruded and foamed plastic articles in one step, said step comprising,
    • embossing the at least one surface of the article by conveying the article below an embossing roller provided with a surface in relief and
    • printing the at least one surface of the article by transferring an ink from a transferable ink composite film,
    said printing being realised concomitant with the embossing by means of the same embossing roller,
    characterised in that the embossing roller is made of an elastic material and is heated to the softening temperature of the surface of the plastic article
  2. Method according to claim 1, wherein the elastic material of the embossing roller is silicone rubber
  3. Method according to claim 1 or 2, wherein the hardness of the elastic material of the embossing roller is between 40 and 90 Shore A, preferably between 60 and 80 Shore A
  4. Method according to any one of claims 1 to 3, wherein the extruded and foamed plastic is selected from the optionally modified thermoplastic (co)polymers, such as crystal polystyrene (PS), impact polystyrene (HIPS), poly(styrene-acrylonitrile) (SAN), poly(acrylonitrile-butadiene-styrene) (ABS) and polyvinyl chloride (PVC), as well as their blends, optionally combined with other thermoplastic polymers, such as, for example polyphenylene oxide (PPO)
  5. Method according to any one of claims 1 to 4, wherein the softening temperature at the surface is between 160 and 200 °C, preferably between 170 and 180 °C.
  6. Device for decorating extruded and foamed plastic articles in one step, said device comprising:
    • a conveying device for feeding the plastic articles,
    • an embossing roller provided with a surface in relief,
    • a heating device for heating the embossing roller,
    • a feeding reel and a wind-up reel for a transferable ink composite film,
    in which the plastic article is moved by the conveying means under the embossing roller that rotates at the conveying speed of the plastic article, said transferable ink composite film coming from the feed reel, being fed between the plastic article and the embossing roller,
    characterised in that the embossing roller is made of an elastic material and may be heated to the softening temperature of the surface of the plastic article.
  7. Device according to claim 6, wherein the elastic material of the embossing roller is silicone rubber.
  8. Device according to claim 6 or 7, wherein the hardness of the elastic material of the embossing roller is between 40 and 90 Shore A, preferably between 60 and 80 Shore A
  9. Device according to any one of claims 6 to 8, wherein the extruded and foamed plastic is selected from the optionally modified thermoplastic (co)polymers, such as crystal polystyrene (PS), impact polystyrene (HIPS), poly(styrene-acrylonitrile) (SAN), poly(acrylonitrile-butadiene-styrene) (ABS) and polyvinyl chloride (PVC), as well as their blends, optionally combined with other thermoplastic polymers, such as, for example polyphenylene oxide (PPO)
  10. Device according to any one of claims 6 to 9, wherein the softening temperature at the surface is between 160 and 200 °C, preferably between 170 and 180 °C.
  11. Use of a method according to any one of claims 1 to 5 or of a device according to any one of claims 6 to 10 for the production of decorated plastic articles, especially mouldings, skirting boards, picture rails and frames
EP05801765A 2004-10-27 2005-10-24 Decorated articles Not-in-force EP1827800B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05801765A EP1827800B1 (en) 2004-10-27 2005-10-24 Decorated articles

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EP04025533A EP1652652A1 (en) 2004-10-27 2004-10-27 Decorated articles
EP05801765A EP1827800B1 (en) 2004-10-27 2005-10-24 Decorated articles
PCT/EP2005/055479 WO2006045763A2 (en) 2004-10-27 2005-10-24 Decorated articles

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BE1031187A1 (en) 2022-12-22 2024-07-16 Nmc Sa WATERPROOFING FINISHING STRIP

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CN103818110B (en) * 2014-02-25 2016-07-06 元亨利云印刷科技（上海）有限公司 A kind of do not shut down printing system of processing and processing technique with multistation
CN106952567A (en) * 2017-03-29 2017-07-14 江苏兴广包装科技有限公司 A kind of holographic positioning composite membrane production method
CN107009775A (en) * 2017-03-29 2017-08-04 江苏兴广包装科技有限公司 A kind of holographic positioning transfer film production method
BE1026627B1 (en) * 2018-09-18 2020-04-16 Nmc Sa ORNATE ITEMS
US20240337112A1 (en) * 2023-04-10 2024-10-10 Engineered Floors, Llc Flooring with embossed core that is directly printed

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ATE484375T1 (en) 2010-10-15
RU2007119640A (en) 2008-12-10
US20090130311A1 (en) 2009-05-21
DE602005024167D1 (en) 2010-11-25
EP1827800A2 (en) 2007-09-05
EP1652652A1 (en) 2006-05-03
CA2584734A1 (en) 2006-05-04
WO2006045763A2 (en) 2006-05-04

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