Classifications

• • 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
  • F16L9/00—Rigid pipes
  • F16L9/12—Rigid pipes of plastics with or without reinforcement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B1/00—Layered products having a non-planar shape
  • B32B1/08—Tubular products
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D23/00—Producing tubular articles
  • B29D23/001—Pipes; Pipe joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
  • B32B37/1207—Heat-activated adhesive
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • 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
  • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
  • F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
• • 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
  • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
  • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
  • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
  • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
  • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
• • 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
• • 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
• • 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
• • 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
• • 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
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/0065—Heat treatment
  • B29C63/0069—Heat treatment of tubular articles
• • 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
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
  • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
  • B29C63/08—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically
  • B29C63/10—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically around tubular articles
• • 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
  • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
  • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
• • 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
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
• • 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
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/04—Polymers of ethylene
  • B29K2023/06—PE, i.e. polyethylene
  • B29K2023/0608—PE, i.e. polyethylene characterised by its density
  • B29K2023/065—HDPE, i.e. high density polyethylene
• • 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
  • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
• • 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
  • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
  • B29K2027/06—PVC, i.e. polyvinylchloride
• • 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
  • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• • 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
  • B29K2995/005—Oriented
  • B29K2995/0051—Oriented mono-axially
• • 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
  • B29K2995/005—Oriented
  • B29K2995/0053—Oriented bi-axially
• • 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
  • B29L2009/00—Layered products
• • 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
  • B29L2023/00—Tubular articles
  • B29L2023/22—Tubes or pipes, i.e. rigid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/514—Oriented
  • B32B2307/518—Oriented bi-axially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2323/00—Polyalkenes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2327/00—Polyvinylhalogenides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2377/00—Polyamides
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
  • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
  • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
  • Y10T428/1393—Multilayer [continuous layer]

Definitions

• the present invention relates to a multilayer plastic tube protected from deterioration of its properties during use and handling.
• - Tubes which must withstand significant mechanical stresses such as large diameter tubes and / or tubes subjected to high internal pressure can be produced economically from ductile iron.
• Plastic tubes are however preferred in many cases to cast iron because of their much greater lightness and remarkable resistance to corrosion.
• a first solution consisted in the production of tubes whose plastic material is bioriented in the directions parallel and perpendicular to the axis of the tube. The biorientation operation can however only be carried out on the tube previously formed by extrusion, which makes the process discontinuous and strikes the cost.
• the reinforcement obtained according to this technique is especially effective in the longitudinal direction and only very partially solves the problem of resistance to radial forces which represent the maximum stresses in certain applications, for example the transport of fluids under pressure. So far, attempts to make the biorientation process continuous have not yet borne fruit, due to technological constraints and the additional cost. important that they induce, compared to the still insufficient resistance gain that is obtained.
• US-A-4,093,004 discloses the principle of the reinforcement of mandrels in various materials (cardboard, paper, rubber, wood or plastic) by means of oriented polyolefin strips.
• the reinforced tube obtained does not, however, have sufficient resistance in environments comprising organic solvents, such as those which are found, for example, in the adhesive compositions used to secure the tube to the fittings.
• the stay of the tube at high temperature is detrimental to the preservation of the orientation of the reinforcing strips and, consequently, to the persistence of the good mechanical strength of the tube.
• the object of the invention is to solve the problems posed by the known reinforcement systems mentioned above, while keeping the production cost within acceptable and competitive limits with ductile iron tubes.
• the invention relates to a multilayer plastic tube protected from deterioration of its properties during use and handling and consisting of a tubular mandrel based on a polymer composition, according to which the tube is protected by two layers each comprising a non-oriented polymer composition, the first being compatible with the polymer composition of the underlying plastic and the second being an outer layer, also serving as a finishing layer.
• the invention relates to a multilayer tube, that is to say a tube formed by a tubular mandrel covered with at least the protective layers, the outermost layer of which forms a continuous surface layer.
• the tubular mandrel is a hollow object in the form of a tube. It consists, at least partially, of a polymer composition.
• polymer composition is intended to denote any material comprising at least one plastic material based on polymer in synthetic resin.
• Plastics which are well suited belong to the category of thermoplastics.
• thermoplastic material any thermoplastic polymer, including thermoplastic elastomers, as well as their mixtures.
• polymer denotes both homopolymers and copolymers (especially binary or ternary). Examples of such copolymers are, without limitation: random distribution copolymers, block copolymers and graft copolymers.
• thermoplastic polymer or copolymer whose melting temperature is lower than the decomposition temperature are suitable.
• Synthetic thermoplastics which have a melting range spread over at least 10 degrees Celsius are particularly suitable.
• such materials there are those which exhibit a polydispersion of their molecular mass.
• polyolefins polyvinyl halides
• thermoplastic polyesters polyketones
• polyamides polyamides
• a mixture of polymers or copolymers can also be used, as well as a mixture of polymeric materials with inorganic, organic and / or natural fillers such as, for example, but not limited to: carbon, salts and other inorganic derivatives, glass fibers, natural mineral fibers or polymer fibers.
• multilayer structures consisting of stacked and integral layers comprising at least one of the polymers or copolymers described above.
• Polymers often used are polyvinyl chloride and high density polyethylene. Excellent results have been obtained with polyvinyl chloride.
• tube “protected from deterioration” means a tube whose capacity for resistance to the conditions of its environment is increased by wrapping the tube by means of at least one layer of material specially adapted to resist under these conditions.
• environmental conditions which can be harmful to the maintenance of the properties of unprotected tubes, mention may be made of the high temperature and the presence of organic solvents.
• the protective layers are precisely the special layers mentioned above which increase the resistance of the tube to sound conditions. environment.
• These protective layers each comprise a polymer composition of non-oriented structure, that is to say a composition comprising, as a polymer only those whose chains of molecules have no particular orientation.
• the first protective layer is compatible with the polymeric composition of the underlying plastic.
• compatible is meant a protective layer, the polymer composition of which it is composed is chemically inert with respect to the underlying plastic and the physical composition of which is such that the molten state it can easily mix with this underlying plastic without giving rise to segregation phenomena. Compatibility can also imply easy adhesion from one layer to another.
• polymeric compositions which are suitable for the first protective layer are those comprising polyvinyl halides and polyolefins.
• Polyvinyl chloride has given excellent results.
• the second protective layer is a finishing layer, that is to say an outer layer which fixes the external dimensions of the tube as well as the nature and the state of its surface.
• the second protective layer may have a composition identical to or different from that of the first layer. In particular, it can be made of the same polymeric material as that of the first layer. Polyvinyl chloride has also given good results in the composition of this second protective layer.
• the mandrel comprises a polymer composition of bioriented structure.
• bioriented structure is meant a polymer structure of which at least 20% by weight of the molecular chains of the polymers which are involved in its composition are arranged in two distinct directions. Preferably, the two directions are perpendicular.
• polymers whose chains are oriented any type of polymer thermoplastic which lends itself easily to the orientation of its chains of molecules. Examples of such polymers are polyolefins, polyvinyl halides, polyamides and their copolymers.
• a second advantageous variant of the tube according to the invention is that in which a reinforcing layer which consists of at least two thicknesses of reinforcing strips comprising an oriented polymer composition is located between the mandrel and the first protective layer.
• a reinforcing layer which consists of at least two thicknesses of reinforcing strips comprising an oriented polymer composition is located between the mandrel and the first protective layer.
• reinforced tube is meant a tube whose intrinsic mechanical properties of the base material composition which constitutes it are modified by the presence of an additional material composition different from this base material and which by its presence provides an additional of mechanical resistance.
• the base material composition is a polymer composition which represents at least 40% by weight of the total weight of the reinforced tube.
• the basic polymer composition is that which is found in the mandrel.
• the composition of additional material is materialized by the composition of the reinforcing layer.
• oriented polymer composition in this case means that the polymer composition comprises at least one oriented polymer.
• the reinforcing layer may comprise a single oriented polymer composition. Alternatively, it can also comprise a mixture of several polymeric compositions and optionally of non-polymeric additives of which at least one of the polymers is oriented.
• the polymer may be any thermoplastic polymer capable of being able to be present in the bands in oriented form, that is to say having at least 20% by weight of the molecular chains which compose it, arranged in the same direction.
• the direction of orientation is that of the length of the strip.
• an oriented polymer is used, the nature of which is the same as that of the polymers commonly used in the production of tubes which must withstand pressure.
• a high density polyethylene (HDPE) mandrel are, without limitation, multimodal HDPE resins and crosslinkable resins.
• the two thicknesses of reinforcing strips are wrapped around the mandrel so that the second thickness completely covers the first around the mandrel.
• an advantageous alternative to the second variant described above consists in that the first thickness of bands of the reinforcing layer is bonded to the mandrel, that is to say secured to the latter by means of an adhesive of usual customary nature.
• the different thicknesses of the reinforcing layer prefferably be additionally glued to one another, in order to ensure maximum cohesion of the whole of the tube.
• an advantageous embodiment of the tube is to include a first protective layer formed of at least one thickness of non-oriented strips wound around the tube.
• another advantageous embodiment is that in which the first protective layer is bonded to the underlying polymer composition.
• the invention also relates to a method for the production of a multilayer plastic tube, protected from deterioration of its properties during use and handling, according to which: a) a first protective layer is applied to a mandrel tubular based on a polymeric composition by winding at least one thickness of strips of non-oriented polymeric composition compatible with the polymeric composition of the underlying plastic; b) a second protective layer is then applied by over-extrusion comprising a non-oriented polymeric composition, forming an external finishing layer.
• a first protective layer is applied to a mandrel tubular based on a polymeric composition by winding at least one thickness of strips of non-oriented polymeric composition compatible with the polymeric composition of the underlying plastic
• a second protective layer is then applied by over-extrusion comprising a non-oriented polymeric composition, forming an external finishing layer.
• the application of the second protective layer by over-extrusion can be done according to any well-known technique of over-extrusion, in particular according to the techniques of over-extrusion used in the industry of manufacturing plastic tubes.
• An example of these techniques is the use of a hollow ring-shaped die in the center of which the tube is passed and which allows the regular and continuous deposition of a controlled quantity of polymeric composition at the periphery of the tube.
• An advantageous variant of the process according to the invention which makes it possible to obtain a protected and reinforced tube with respect to mechanical stresses consists in carrying out the following operations: a) first applying to a mandrel comprising a composition polymer of non-oriented structure a reinforcing layer made up of at least two thicknesses of strips comprising an oriented polymeric composition, by winding the strips in such a way that the strips of a particular thickness form with those of the adjacent thickness a similar angle and of opposite sign with respect to the direction of the tube; b) the first protective layer is then applied; c) the external finishing layer is applied last.
• similar angle means an angle at least equal to the same angle minus 5 degrees of angle.
• similar angle also includes an angle at most equal to the same angle plus 5 degrees of angle.
• this term means an angle at least equal to the same angle minus 2 degrees of angle.
• it comprises an angle at most equal to the same angle plus 2 degrees of angle.
• thermoly activatable polymeric adhesive after its installation, by carrying out the following operations, in order: a) the strips of the reinforcing layer are preglued by means of the thermally activatable polymeric adhesive ; b) these reinforcing strips are applied by winding around the mandrel; c) the first protective layer is applied; d) the adhesive of the reinforcing layer is activated by irradiation of the tube being formed by means of infrared radiation; e) the external finishing layer is applied.
• the pre-gluing operation can be carried out immediately before the application of the reinforcement strips, or alternatively in deferred time, at another time before the manufacture of the tube. Similarly, it can be applied to a face of the bands, or on both. Preferably, it is applied to one of the faces.
• This technique advantageously makes it possible to apply the reinforcement strips without first heating them and then to easily dose the flow of heat irradiated by infrared radiation through the first protective layer so that it does not destroy the orientation of the polymeric composition of reinforcing strips.
• At least one of the protective layers can also, as a variant, be bonded to the underlying structure by means of an adhesive.
• This adhesive can, for example, be activated by infrared irradiation.
• the glued tape was wrapped around a POLVA ® PVC tube of
• the additives included a mixture of tin stabilizer of the carboxylate type (3% by weight relative to the PVC), of a product facilitating the implementation (1% by weight of polymethyl methacrylate) and of a lubricant ( 1% by weight) composed of a mixture of Ca stearate, paraffin and oxidized polyethylene wax.
• the adhesive was then activated under the same conditions as those described above for the oriented strips.
• the tube obtained was then covered with a finishing layer of SOLVIN ® 266RC PVC (quality usually used for tubes 300 ⁇ m thick), to which the same additives were added as those described above, by passing through an annular die, then in a calibration device and in a cooling container filled with water at ordinary temperature.
• SOLVIN ® 266RC PVC quality usually used for tubes 300 ⁇ m thick
• the tubes according to the invention have a significantly improved burst strength compared to an unreinforced tube. It is even possible to save around 25% in material weight compared to a conventional tube, while nevertheless gaining 15% in burst strength (reinforced and protected POLVA ® tube of 3.2 mm thickness).

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Laminated Bodies (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Materials For Medical Uses (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)

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• 2001
  • 2001-04-27 BE BE2001/0292A patent/BE1014146A3/fr not_active IP Right Cessation
• 2002
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  • 2002-04-25 ES ES02735308T patent/ES2289106T3/es not_active Expired - Lifetime
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  • 2002-04-25 AT AT02735308T patent/ATE365105T1/de active
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• 2003
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• 2007
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