FR2922291A1 - Hose i.e. water hose, has external layer having irregular thickness in circumferential direction and in longitudinal direction, where external layer presents multi-colored appearance with stripes longitudinally extended and degraded in dye - Google Patents
Hose i.e. water hose, has external layer having irregular thickness in circumferential direction and in longitudinal direction, where external layer presents multi-colored appearance with stripes longitudinally extended and degraded in dye Download PDFInfo
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- FR2922291A1 FR2922291A1 FR0707203A FR0707203A FR2922291A1 FR 2922291 A1 FR2922291 A1 FR 2922291A1 FR 0707203 A FR0707203 A FR 0707203A FR 0707203 A FR0707203 A FR 0707203A FR 2922291 A1 FR2922291 A1 FR 2922291A1
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- layer
- external layer
- hose
- outer layer
- longitudinal direction
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
- B29C48/023—Extruding materials comprising incompatible ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/17—Articles comprising two or more components, e.g. co-extruded layers the components having different colours
- B29C48/175—Articles comprising two or more components, e.g. co-extruded layers the components having different colours comprising a multi-coloured single component, e.g. striated, marbled or wood-like patterned
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/87—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
- F16L11/124—Distinguishing marks for hoses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/17—Articles comprising two or more components, e.g. co-extruded layers the components having different colours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/007—Hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0072—Roughness, e.g. anti-slip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/722—Decorative or ornamental articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L2201/00—Special arrangements for pipe couplings
- F16L2201/60—Identification or marking
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
La présente invention concerne des tubes ou tuyaux, notamment d'arrosage en matière plastique extrudée ayant une couche externe ayant une fonction décorative et le pro-cédé de fabrication de ces tuyaux. The present invention relates to tubes or pipes, especially sprinkler extruded plastic having an outer layer having a decorative function and the process of manufacture of these pipes.
ARRIERE PLAN DE L'INVENTION On rappellera qu'un tuyau d'arrosage est classique-ment composé de plusieurs couches de matériau thermoplastique co-extrudées : une âme interne formant barrière aux éléments contenus dans le fluide véhiculé, généralement pourvue à l'extérieur d'une armature tricotée ou tressée ou guipée, une seconde couche au-dessus de cette armature et une troisième couche extérieure en PVC destinée principale-ment à renforcer le tuyau contre les agressions extérieures. BACKGROUND OF THE INVENTION It will be recalled that a garden hose is conventionally composed of several co-extruded layers of thermoplastic material: an internal core forming a barrier to the elements contained in the fluid conveyed, generally provided on the outside with a frame knitted or braided or gimped, a second layer above this frame and a third outer layer of PVC intended primarily to strengthen the pipe against external aggression.
La couleur d'un tel produit est habituellement verte ou jaune, c'est-à-dire sans grande fantaisie, dans un marché très concurrencé. En outre la couleur de ces tuyaux est soit uni-forme, résultant d'une coloration dans la masse de la cou- che extérieure, soit irisée du fait d'une combinaison de la couleur de la dernière sous-couche avec une couche extérieure transparente ou semi transparente qui diffracte la lumière reçue par la dernière sous-couche et réfléchie au travers de cette couche extérieure. Il n'existe pas de pro- cessus industriel permettant d'obtenir de manière compétitive d'autres combinaisons de couleurs et notamment des distributions aléatoires de couleur à la peau extérieure du tuyau. OBJET DE L'INVENTION La présente invention a pour premier objet un tuyau dont la couche extérieure est d'épaisseur irrégulière tant dans une direction circonférentielle que dans une direction longitudinale. Un tel tuyau présente alors, lorsque la couleur de 35 la dernière couche est différente de celle de la couche qui la précède, un effet de marbrures dont les veines sont orientées de manière sensiblement parallèle à la direction longitudinale du tuyau affectant un dégradé dans le sens longitudinal et dans le sens circonférentiel. The color of such a product is usually green or yellow, that is to say without much fantasy, in a highly competitive market. In addition the color of these pipes is either uni-form, resulting from a coloration in the mass of the outer layer, or iridescent due to a combination of the color of the last undercoat with a transparent outer layer or semi-transparent which diffracts the light received by the last sub-layer and reflected through this outer layer. There is no industrial process for competitively obtaining other color combinations, including random color distributions to the outer skin of the pipe. OBJECT OF THE INVENTION The present invention firstly relates to a pipe whose outer layer is of irregular thickness both in a circumferential direction and in a longitudinal direction. Such a pipe then has, when the color of the last layer is different from that of the layer which precedes it, a mottling effect whose veins are oriented substantially parallel to the longitudinal direction of the pipe affecting a gradient in the direction longitudinal and in the circumferential direction.
Le deuxième objet de l'invention est un procédé de fabrication d'un tuyau selon lequel on co-extrude plusieurs couches de matière thermoplastique, éventuellement sur une âme renforcée, caractérisé par la co-extrusion d'une couche extérieure dont la dureté après solidification est supé-rieure à celle de la couche adjacente, dont la température dans la tête d'extrusion est inférieure à celle normalement prévue pour la matière considérée et dont la quantité déposée est de l'ordre de cinq à dix fois inférieure à celle de la couche adjacente. The second object of the invention is a method of manufacturing a pipe according to which coextrudes several layers of thermoplastic material, optionally on a reinforced core, characterized by the coextrusion of an outer layer whose hardness after solidification. is greater than that of the adjacent layer, whose temperature in the extrusion head is lower than that normally expected for the material in question and whose quantity deposited is of the order of five to ten times lower than that of the adjacent layer.
Dans ces conditions de co-extrusion, la couche extérieure présente des irrégularités d'épaisseur telles qu'elle donne à la surface extérieure du tuyau un aspect marbré c'est-à-dire une distribution de couleur en forme de veines dont le ton le plus foncé correspond à la couleur du matériau extrudé à l'extérieur avec un dégradé de teinte allant jusqu'à la couleur de la couche sous-jacente. Les veines sont distribuées de manière aléatoires le long du tuyau et sur sa périphérie et s'étendent de manière sensiblement longitudinale sue cette surface extérieure. Under these conditions of coextrusion, the outer layer has thickness irregularities such that it gives the outer surface of the pipe a marbled appearance that is to say a color distribution in the form of veins whose tone the darker corresponds to the color of the extruded material on the outside with a gradation of hue up to the color of the underlying layer. The veins are distributed randomly along the pipe and on its periphery and extend substantially longitudinally on this outer surface.
D'autres caractéristiques et avantages de l'invention ressortiront de la description donnée ci-après d'un exemple de réalisation de l'invention. BREVE DESCRIPTION DES DESSINS Il sera fait référence aux dessins annexés parmi 30 lesquels : - la figure 1 illustre par une vue extérieure schématique l'aspect de la peau extérieure d'un tuyau selon l'invention, -la figure 2 est une vue partielle en coupe de ce 35 tuyau, - la figure 3 est une demi-coupe schématique d'une tête de coextrusion des différentes couches d'un tuyau conforme à l'invention. DESCRIPTION DETAILLEE DE L'INVENTION En se reportant aux figures, on constate que le tuyau 1 de l'invention comporte une peau extérieure 2 pré-sentant une apparence marbrée avec des veines 3 s'étendant sensiblement longitudinalement et dégradées en teinte, tant dans la direction circonférentielle que dans la direction longitudinale et ce, de manière totalement aléatoire. Les parties de veine les plus foncées correspondent, comme illustré par la figure 2, aux parties les plus épaisses 4 de la peau ou couche extérieure 2 alors que la teinte des veines s'estompe au profit de la couleur de la couche sous-jacente lorsque l'épaisseur de cette couche 2 diminue (zones 5) voire disparaît. Pour obtenir un tel tuyau, on co-extrude plusieurs couches de matière thermoplastique (au moins deux) telles que les couches 6 et 2, sur une âme renforcée 7. La couche extérieure 2 est choisie pour que sa dureté après solidification soit supérieure à celle de la couche adjacente 6. L'écart de dureté sera au moins égal à 5 Shore A. Par exemple, la dureté de la dernière couche 2 sera de 80 Shore A ou plus alors que la dureté de la couche 6 est au plus égale à 75 Shore A. En outre, la dureté de la couche 2 ne sera pas inférieure à 80 Shore A, quelle que soit la dureté de la couche sous-jacente. En outre, la température dans la tête d'extrusion de la dernière couche 2 est inférieure à celle normalement prévue pour la matière dont elle est faite. Par exemple, la température atteinte par le produit dans la tête d'extrusion ne sera pas supérieure à 170°C car, au-delà de cette température, le mélange PVC qui constitue cette der- nière couche 2 deviendra trop souple et se répartira uni- formément sur la sous-couche. En revanche, une température inférieure à 170°C pour ce même mélange, permettra de conserver à la matière une certaine hétérogénéité qui sera favorable à la formation de l'aspect marbré. Enfin, l'effet désiré sera obtenu si, impérative- ment la vitesse de dépôt de la couche de peau est très inférieure à celle d'extrusion de la sous-couche, ce qui se traduit par un débit massique de matière déposée de l'ordre de cinq à dix fois inférieure à celui de la sous-couche. La vitesse de dépôt se règle par d'une part, le débit de l'extrudeuse de la couche de peau et d'autre part, par la vitesse de défilement du tuyau sous celle-ci. A la figure 3, on a représenté schématiquement une tête d'extrusion pour mettre en oeuvre le procédé ci-dessus. Celle-ci 10 est de construction classique, traversée par un premier tube 11 en PVC supportant une armature 12, par exemple une gaine tubulaire en fibres polymériques tricotées. Une première chambre 13 est alimentée en une matière permettant de réaliser une première couche en sur extrusion sur l'âme armée 11, 12. Par des canaux appropriés, une se-conde matière 14 est adjointe au flux de la première matière. Enfin, au flux composite ainsi constitué, en aval dans la tête d'extrusion, il est adjoint à l'extérieur une troisième matière 15 qui constituera la peau 2 du tuyau fi-ni sortant de la tête d'extrusion avec son aspect extérieur marbré. Les matériaux utilisés sont des PVC. Les effets obtenus dépendront, bien entendu, des couleurs employées pour les matières thermoplastiques 14 et 15 et des différents réglages en débits relatifs entre les couches 14 et 15, des différents degrés de dureté entre ces couches et des diffé- rentes températures qui auront été établies, conformément aux critères énoncés plus haut. On comprend que, dans le respect de ces critères, il est possible d'obtenir de nombreuses nuances de peaux marbrées en fonction des réglages de la machine en produc- tion. Other features and advantages of the invention will emerge from the description given below of an exemplary embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Reference will be made to the accompanying drawings, of which: FIG. 1 is a diagrammatic external view of the appearance of the outer skin of a pipe according to the invention, FIG. 2 is a partial view of Figure 3 is a schematic half-section of a coextrusion head of the different layers of a pipe according to the invention. DETAILED DESCRIPTION OF THE INVENTION Referring to the figures, it can be seen that the pipe 1 of the invention comprises an outer skin 2 having a marbled appearance with veins 3 extending substantially longitudinally and degraded in color, both in the circumferential direction only in the longitudinal direction and this, totally random. The darker vein portions correspond, as shown in FIG. 2, to the thickest portions 4 of the skin or outer layer 2 while the vein color fades to the benefit of the color of the underlying layer when the thickness of this layer 2 decreases (zones 5) or disappears. To obtain such a pipe, coextrudes several layers of thermoplastic material (at least two) such as layers 6 and 2, on a reinforced core 7. The outer layer 2 is chosen so that its hardness after solidification is greater than that of the adjacent layer 6. The difference in hardness will be at least 5 Shore A. For example, the hardness of the last layer 2 will be 80 Shore A or more while the hardness of the layer 6 is at most equal to In addition, the hardness of layer 2 will not be less than 80 Shore A, regardless of the hardness of the underlying layer. In addition, the temperature in the extrusion head of the last layer 2 is lower than that normally provided for the material of which it is made. For example, the temperature reached by the product in the extrusion head will not be greater than 170 ° C because, beyond this temperature, the PVC mixture which constitutes the latter layer 2 will become too flexible and will be evenly distributed. - formally on the underlayer. In contrast, a temperature below 170 ° C for the same mixture, will maintain the material a certain heterogeneity that will be favorable to the formation of the marbled appearance. Finally, the desired effect will be obtained if, necessarily, the deposition rate of the skin layer is much lower than that of extrusion of the underlayer, which results in a mass flow rate of deposited material of the five to ten times less than that of the underlayment. The deposition rate is set on the one hand, the flow rate of the extruder of the skin layer and, on the other hand, by the running speed of the pipe under it. In Figure 3, there is shown schematically an extrusion head to implement the above method. This is of conventional construction, traversed by a first tube 11 of PVC supporting a frame 12, for example a tubular sheath of knitted polymeric fibers. A first chamber 13 is fed with a material making it possible to produce a first extrusion layer on the reinforced core 11, 12. By appropriate channels, a second material 14 is added to the flow of the first material. Finally, to the composite stream thus formed, downstream in the extrusion head, there is added to the outside a third material 15 which will constitute the skin 2 of the fi-ni pipe coming out of the extrusion head with its marbled outer appearance . The materials used are PVC. The effects obtained will, of course, depend on the colors employed for the thermoplastics 14 and 15 and the different relative flow settings between the layers 14 and 15, the different degrees of hardness between these layers and the different temperatures which will have been established. in accordance with the criteria set out above. It is understood that, in compliance with these criteria, it is possible to obtain many shades of marbled skin depending on the settings of the machine in production.
L'invention n'est pas limitée à l'exemple décrit ci-dessus mais concerne les variantes qui consisteraient par exemple, à modifier les matières employées. The invention is not limited to the example described above but relates to the variants which would consist for example of modifying the materials used.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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FR0707203A FR2922291B1 (en) | 2007-10-15 | 2007-10-15 | DECORATED PIPE AND METHOD OF MANUFACTURE |
Applications Claiming Priority (1)
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FR0707203A FR2922291B1 (en) | 2007-10-15 | 2007-10-15 | DECORATED PIPE AND METHOD OF MANUFACTURE |
Publications (2)
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FR2922291A1 true FR2922291A1 (en) | 2009-04-17 |
FR2922291B1 FR2922291B1 (en) | 2010-08-20 |
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FR0707203A Expired - Fee Related FR2922291B1 (en) | 2007-10-15 | 2007-10-15 | DECORATED PIPE AND METHOD OF MANUFACTURE |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013076155A1 (en) * | 2011-11-22 | 2013-05-30 | Gardena Manufacturing Gmbh | Garden hose |
US9741212B2 (en) | 2014-04-25 | 2017-08-22 | Abb Hv Cables (Switzerland) Gmbh | Bend stiffener with bend indication |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2345049A1 (en) * | 1973-09-06 | 1975-03-20 | Breyer Anton Fa | Thermoplastic laminates from plastics of differing props. - by heating different plastics in separate thermally insulated channels |
JPS52137461A (en) * | 1976-05-12 | 1977-11-16 | Sekisui Jushi Kk | Method of producing twoocolor extruded marking pole |
US4410012A (en) * | 1980-10-20 | 1983-10-18 | The United States Of America As Represented By The Secretary Of The Navy | Radially compliant acoustic line array hose |
DE3929051C1 (en) * | 1989-09-01 | 1990-04-26 | Kunststoffwerk Voerde Hueck & Schade, 5828 Ennepetal, De | |
EP1533243A1 (en) * | 2002-07-31 | 2005-05-25 | Yoshino Kogyosho Co., Ltd. | Layered tube, and formed product of tube that is formed of the layered tube |
EP1818587A2 (en) * | 2006-02-09 | 2007-08-15 | Hozelock Tricoflex | Flexible pipe made from plastic material |
-
2007
- 2007-10-15 FR FR0707203A patent/FR2922291B1/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2345049A1 (en) * | 1973-09-06 | 1975-03-20 | Breyer Anton Fa | Thermoplastic laminates from plastics of differing props. - by heating different plastics in separate thermally insulated channels |
JPS52137461A (en) * | 1976-05-12 | 1977-11-16 | Sekisui Jushi Kk | Method of producing twoocolor extruded marking pole |
US4410012A (en) * | 1980-10-20 | 1983-10-18 | The United States Of America As Represented By The Secretary Of The Navy | Radially compliant acoustic line array hose |
DE3929051C1 (en) * | 1989-09-01 | 1990-04-26 | Kunststoffwerk Voerde Hueck & Schade, 5828 Ennepetal, De | |
EP1533243A1 (en) * | 2002-07-31 | 2005-05-25 | Yoshino Kogyosho Co., Ltd. | Layered tube, and formed product of tube that is formed of the layered tube |
EP1818587A2 (en) * | 2006-02-09 | 2007-08-15 | Hozelock Tricoflex | Flexible pipe made from plastic material |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Week 197801, Derwent World Patents Index; AN 1978-01019A, XP002484249 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013076155A1 (en) * | 2011-11-22 | 2013-05-30 | Gardena Manufacturing Gmbh | Garden hose |
US9741212B2 (en) | 2014-04-25 | 2017-08-22 | Abb Hv Cables (Switzerland) Gmbh | Bend stiffener with bend indication |
Also Published As
Publication number | Publication date |
---|---|
FR2922291B1 (en) | 2010-08-20 |
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