Provided is an extrusion molding apparatus capable of producing a multi tube with which an outer shape of a cross section is close to a perfect circle. The multi-lumen tube extrusion molding apparatus includes a resin supplying portion, a die that has an extrusion port at a lower end portion and molds the multi-lumen tube as the resin supplied from the resin supplying portion is extruded vertically downward, and an outer surface molding apparatus that molds an outer surface of the extruded tube. In a state in which the resin is supplied from the resin supplying portion to the die, the outer surface molding apparatus depressurizes a molding space of circular cylindrical shape in a state in which the extruded tube is contained in the molding space to mold an outer surface of the contained multi-lumen tube to a circular cylindrical shape.
B29C 48/00 - Moulage par extrusion, c.-à-d. en exprimant la matière à mouler dans une matrice ou une filière qui lui donne la forme désiréeAppareils à cet effet
B29C 48/11 - Objets dont la section transversale comporte des cavités partiellement ou entièrement fermées, p. ex. tuyaux ou canaux comprenant au moins deux cavités partiellement ou entièrement fermées, p. ex. en forme alvéolaire
B29C 48/32 - Filières ou matrices d’extrusion avec une ouverture annulaire, p. ex. pour former des objets tubulaires
Provided is a mold capable of shortening the length of a part mixed with resin before and after switching when switching the resin to be extruded onto the surface of a braided wire, and a flexible tube producing apparatus using the same. The mold for extruding the flexible tube includes a linear through hole through which a braided wire inserted from one end is drawn out from the other end, a first resin supply path connected to the through hole and having a flow path parallel to a plane orthogonal to the central axis of the through hole, and a second resin supply path connected to the through hole on the one end side of the through hole relative to the connection point between the first resin supply path and the through hole, and having a flow path parallel to the plane.
B29C 48/335 - Filières d’extrusion à orifices annulaires multiples disposés coaxialement, p. ex. pour fabriquer des objets tubulaires multicouches
B29C 48/10 - Objets dont la section transversale comporte des cavités partiellement ou entièrement fermées, p. ex. tuyaux ou canaux flexibles, p. ex. pellicules flexibles soufflées
B29C 48/21 - Articles comprenant au moins deux composants, p. ex. couches coextrudées les composants étant des couches les couches étant jointes à leurs surfaces
A die has an inner die that has a straight portion of circular columnar outer shape and a convergent tapered portion provided closer to an extrusion port side than the straight portion and an outer die that houses the inner die. A first supply passage connecting a first valve and a flow passage, a second supply passage connecting a second valve and the flow passage, and a third supply passage connecting a third valve and the flow passage are provided inside the die. Downstream side end portions of the first supply passage and the second supply passage are connected to a portion of the flow passage formed between the straight portion and the outer die and a downstream side end portion of the third supply passage is connected to a portion of the flow passage formed between the tapered portion and the outer die.
B32B 41/00 - Dispositions pour le contrôle ou la commande des procédés de stratificationDispositions de sécurité
B29C 48/10 - Objets dont la section transversale comporte des cavités partiellement ou entièrement fermées, p. ex. tuyaux ou canaux flexibles, p. ex. pellicules flexibles soufflées
Provided is a flexible tube production apparatus capable of shortening the length of a resin layer in which the mixing ratio between two kinds of resins changes. The flexible tube production apparatus includes: two extruders extruding resins different from each other; two valves provided corresponding to the two extruders, respectively; a kneading mechanism kneading the resins supplied from the two extruders via the two valves; a die extruding the resins kneaded by the kneading mechanism; and a control device controlling the two valves to switch from a first state where one extruder and the kneading mechanism communicate with each other and communication between the other extruder and the kneading mechanism is cut off, to a second state where the other extruder and the kneading mechanism communicate with each other and communication between the one extruder and the kneading mechanism is cut off, when the flexible tube is extruded.
B29C 48/10 - Objets dont la section transversale comporte des cavités partiellement ou entièrement fermées, p. ex. tuyaux ou canaux flexibles, p. ex. pellicules flexibles soufflées
B29C 48/16 - Articles comprenant au moins deux composants, p. ex. couches coextrudées
B29C 48/255 - Moyens de commande de l’écoulement, p. ex. valves
B29C 48/49 - Moyens pour plastifier ou homogénéiser la matière à mouler ou pour la forcer dans la filière ou la matrice utilisant plusieurs extrudeuses pour alimenter une matrice ou une filière
Provided is a flexible tube production apparatus capable of precisely changing the mixing ratio of two types of resin with a good response. The flexible tube production apparatus according to one embodiment of the present invention is provided with: a molding device which extrudes and molds supplied resins on the surface of a braid wire and has a first extruder for extruding a first resin, a second extruder for extruding a second resin softer than the first resin, a first resin supply path to which the first resin is supplied from the first extruder, and a second resin supply path to which the second resin is supplied from the second extruder; a first gear pump provided in the middle of the first resin supply path; and a second gear pump provided in the middle of the second resin supply path. The first gear pump and the second gear pump are integrally formed with the molding device.
B29C 48/49 - Moyens pour plastifier ou homogénéiser la matière à mouler ou pour la forcer dans la filière ou la matrice utilisant plusieurs extrudeuses pour alimenter une matrice ou une filière
Provided is a flexible tube manufacturing device that can reduce a length of a resin layer in which a mixing ratio of two resins is changed. The flexible tube manufacturing device includes: two extruders for extruding resins different from each other; two valves respectively provided corresponding to the two extruders; a kneading mechanism for kneading the resins supplied from the two extruders via the two valves; a die for extruding the resins kneaded by the kneading mechanism; and a control device for controlling the two valves to switch, during extrusion molding of the flexible tube, from a first state in which one extruder is in communication with the kneading mechanism and communication between the other extruder and the kneading mechanism is interrupted to a second state in which the other extruder is in communication with the kneading mechanism and communication between the one extruder and the kneading mechanism is interrupted.
B29C 48/154 - Revêtement d’articles pleins, c.-à-d. d’articles non creux
B29C 48/16 - Articles comprenant au moins deux composants, p. ex. couches coextrudées
B29C 48/255 - Moyens de commande de l’écoulement, p. ex. valves
B29C 48/34 - Filières d’extrusion annulaires à croisillon, c.-à-d. pour recevoir simultanément la matière à mouler et la préforme à revêtir
B29C 48/49 - Moyens pour plastifier ou homogénéiser la matière à mouler ou pour la forcer dans la filière ou la matrice utilisant plusieurs extrudeuses pour alimenter une matrice ou une filière
A flexible tube manufacturing apparatus according to the present invention includes: a mixing valve mechanism in which a mixing ratio between a first resin and a second resin is variable; a switching valve mechanism capable of selectively supplying a resin extruded from the mixing valve mechanism or a flexible third resin extruded from an extruder to a mold; and a control device. During extrusion molding, the control device controls the switching valve mechanism so as to change the resin mixing ratio at the mixing valve mechanism in a state where the switching valve mechanism is controlled so that the resin extruded from the mixing valve mechanism can be supplied to the mold, and to supply the third resin to the mold when the proportion of the second resin has reached a prescribed value.
B29C 48/15 - Moulage par extrusion, c.-à-d. en exprimant la matière à mouler dans une matrice ou une filière qui lui donne la forme désiréeAppareils à cet effet incorporant des éléments ou des couches préformés, p. ex. moulage par extrusion autour d’inserts
B29C 48/154 - Revêtement d’articles pleins, c.-à-d. d’articles non creux
B29C 48/255 - Moyens de commande de l’écoulement, p. ex. valves
B29C 48/70 - Diviseurs d’écoulement, p. ex. grilles comprenant des moyens de séparation, de répartition et de recombinaison des flux de matière fondue
A flexible tube production apparatus includes a die composed of: a cylindrical inner die having an outer face in which a groove is formed; a tubular member that is housed inside the inner die, and has a through-hole that allows a blade wire to be inserted from one end to the other end thereof; and an outer die that surrounds the inner die such that a predetermined gap is generated between itself and the outer face of the inner die, and has an extrusion hole that extrudes the resins having been supplied to the gap, onto the outer face of the blade wire that is fed from the other end of the tubular member. A resin supply portion supplies a first resin and a second resin to the die while the motor rotates the inner die about a center axis.
B29C 48/34 - Filières d’extrusion annulaires à croisillon, c.-à-d. pour recevoir simultanément la matière à mouler et la préforme à revêtir
B29C 48/10 - Objets dont la section transversale comporte des cavités partiellement ou entièrement fermées, p. ex. tuyaux ou canaux flexibles, p. ex. pellicules flexibles soufflées
B29C 48/154 - Revêtement d’articles pleins, c.-à-d. d’articles non creux
In order to provide a suitable manufacturing device for manufacturing a flexible tube in which a blending ratio of two types of resins that constitute a resin layer is continuously changed, this manufacturing device for a flexible tube is provided with a die that includes: an inner mold that has a cylindrical shape and that is provided with grooves on the outer surface thereof; a tubular member that is accommodated inside the inner mold and that has a through-hole having a blade wire inserted therein from one end to the other end thereof; and an outer mold that surrounds the inner mold such that a predetermined gap is produced between the inner mold and the outer mold, and that has an extrusion opening for extruding a resin supplied into the gap, on the outer surface of the blade wire that is delivered from the other end of the tubular member, wherein a resin supply unit supplies a first resin and a second resin to the die while a motor rotates the inner mold around a center shaft.
B29C 48/15 - Moulage par extrusion, c.-à-d. en exprimant la matière à mouler dans une matrice ou une filière qui lui donne la forme désiréeAppareils à cet effet incorporant des éléments ou des couches préformés, p. ex. moulage par extrusion autour d’inserts
B29C 48/25 - Éléments constitutifs, détails ou accessoiresOpérations auxiliaires
B29C 48/34 - Filières d’extrusion annulaires à croisillon, c.-à-d. pour recevoir simultanément la matière à mouler et la préforme à revêtir
Provided is an apparatus for manufacturing a foamed resin tube with which a high-foam-content foamed resin tube that has a surface embossed with protrusions and recesses can be manufactured at high yields with few steps with minimal distortion in the cross-sectional shape. A first resin containing a foaming agent is supplied to a first flow channel 35 of a die 2. A second resin having a higher temperature than the first resin is supplied to a second flow channel 36. A thermal insulation layer provided inside dies 31 suppresses heating of the first resin by the second resin, and keeps the temperature of the first resin in the temperature range required to yield a high foam content. A high-foam-content foamed resin tube having an embossed profile is manufactured by performing the following simultaneously within a mold: extrusion of the first resin, which includes the foaming agent; extrusion of the second resin; and molding of the resins.
B29C 44/00 - Moulage par pression interne engendrée dans la matière, p. ex. par gonflage ou par moussage
B29C 47/20 - avec une ouverture annulaire, p.ex. pour objets tubulaires
B29C 47/88 - Chauffage ou refroidissement de la matière extrudée
B29C 59/02 - Façonnage de surface, p. ex. gaufrageAppareils à cet effet par des moyens mécaniques, p. ex. par pressage
F16L 11/12 - Manches, c.-à-d. tuyaux flexibles en caoutchouc ou en matériaux plastiques flexibles avec agencements pour usages particuliers, p. ex. spécialement profilés, avec couche protectrice, chauffés, conducteurs d'électricité
F16L 59/147 - Dispositions pour l'isolation des tuyaux ou des tuyauteries l'isolation étant placée à l'intérieur par rapport à la surface extérieure du tuyau
11.
FOAMED RESIN TUBE MANUFACTURING DEVICE AND MANUFACTURING METHOD, AND FOAMED RESIN TUBE
Provided are a foamed resin tube manufacturing device and manufacturing method with which it is possible to manufacture, in the smaller number of steps and at a higher yield, a foamed resin tube having a surface provided with protrusions and recesses by embossing while suppressing distortion of the cross-sectional shape. A die 2 is provided with a ring-shaped first discharge port 33 and a first channel 35 communicating with the first discharge port 33. The first channel 35 in the die 2 is supplied with a first resin in a melted state containing a foaming agent from a first resin supply unit. The first discharge port 33 in the die 2 is disposed in a molding space sandwiched by concave portions of a mold 20a and a mold to be paired with the mold 20a. Vacuum molding or air pressure molding is performed in a molding device 5 while pushing the first resin containing the foaming agent out from the first discharge port 33, whereby the foaming of the first resin and the molding of the first resin into a tubular shape having a surface with emboss design can be simultaneously performed.
Provided is a manufacturing device capable of manufacturing a flexible tube of which the hardness changes naturally along a length direction thereof. A mixing valve 4 is provided with a first valve that distributes first resin to a resin supply path and a resin discharge path and a second valve that distributes second resin to the resin supply path and the resin discharge path. The mixing valve 4 changes a distribution ratio of the first resin with the first valve and a distribution ratio of the second resin with the second valve while maintaining the total of supply amounts of the first resin and the second resin supplied to a die 2 at a constant amount, thereby increasing or decreasing a mixing ratio between the first resin and the second resin as the flexible tube is molded.
Provided is a production apparatus capable of producing a flexible tube whose hardness is naturally varied along the length direction thereof. This mixing valve includes: a first valve configured to distribute a first resin to a resin supply path and a resin discharge path; and a second valve configured to distribute a second resin to the resin supply path and the resin discharge path. In the mixing valve, the mixing proportion between the first resin and the second resin is increased or decreased in association with molding of the flexible tube, by changing a distribution ratio of the first resin in the first valve and a distribution ratio of the second resin in the second valve while keeping constant the total of the supply mounts of the first resin and the second resin supplied to a die.
B29C 48/335 - Filières d’extrusion à orifices annulaires multiples disposés coaxialement, p. ex. pour fabriquer des objets tubulaires multicouches
B29C 48/10 - Objets dont la section transversale comporte des cavités partiellement ou entièrement fermées, p. ex. tuyaux ou canaux flexibles, p. ex. pellicules flexibles soufflées
B29C 48/49 - Moyens pour plastifier ou homogénéiser la matière à mouler ou pour la forcer dans la filière ou la matrice utilisant plusieurs extrudeuses pour alimenter une matrice ou une filière
B29C 48/32 - Filières ou matrices d’extrusion avec une ouverture annulaire, p. ex. pour former des objets tubulaires
In the forming of inside and outside pipes of a multilayer pipe by thermal melting of first and second resins of different types, there can be realized inside and outside pipes of a multilayer pipe both having desirable material quality and desirable precision. Extrusion forming apparatus (1) includes first and second extruders (10,11) for separately extruding of first and second resins (8,9) of different types; die (12) provided with not only inside channel (31) for allowing the first resin (8) to pass therethrough to thereby attain forming of inside pipe (4) but also outside channel (37) for allowing the second resin (9) to pass therethrough to thereby attain forming of outside pipe (5) externally fitted on the inside pipe (4) so that multilayer pipe (2) is formed by the inside and outside pipes (4,5); and heater (13) for heating the die (12). The heater (13) is equipped with first heater (42) for heating part (12a) of the die (12) provided with at least part of the inside channel (31) and second heater (43) for heating other part (12b) of the die (12) provided with at least part of the outside channel (37) independently from the first heater (42).
A catheter molding apparatus that includes a fore-stage extrusion molding device for extrusion molding an inner layer tube of resin so as to fit a core wire material of metal therein, a braided layer attaching unit for attaching a braided layer made by the braiding of a reinforcing thread to the outer surface of the inner layer tube molded by the fore-stage extrusion molding device and once cooled, thereby molding a braided tube. The apparatus also includes a post-stage extrusion molding device for extrusion molding a raw material tube for a catheter by fitting an outer layer tube of resin thereon, and a take-off unit for taking off the raw material tube. The fore-stage extrusion molding device, braided layer attaching unit, post-stage extrusion molding device, and take-off unit are continuously disposed along the longitudinal direction of the tubes.
brevets
