WO2013137346A1 - Dispositif de moulage par extrusion et procédé permettant de produire un article moulé à l'aide de ce dernier - Google Patents

Dispositif de moulage par extrusion et procédé permettant de produire un article moulé à l'aide de ce dernier Download PDF

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Publication number
WO2013137346A1
WO2013137346A1 PCT/JP2013/057077 JP2013057077W WO2013137346A1 WO 2013137346 A1 WO2013137346 A1 WO 2013137346A1 JP 2013057077 W JP2013057077 W JP 2013057077W WO 2013137346 A1 WO2013137346 A1 WO 2013137346A1
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Prior art keywords
resistance
molded body
tube
die
material composition
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PCT/JP2013/057077
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English (en)
Japanese (ja)
Inventor
照夫 小森
和也 土本
朝 吉野
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住友化学株式会社
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Publication of WO2013137346A1 publication Critical patent/WO2013137346A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/2672—Means for adjusting the flow inside the die, e.g. using choke means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/206—Forcing the material through screens or slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/2654—Means for heating or cooling the die
    • 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
    • B29C48/03—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
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
    • 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
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/385—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in separate barrels
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
    • 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
    • B29C48/865—Heating
    • 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
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • B29C48/705—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows in the die zone, e.g. to create flow homogeneity
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating

Definitions

  • honeycomb filter structures have been widely known for use in diesel particulate filters.
  • This honeycomb filter structure has a structure in which one end side of some through holes of a honeycomb structure having a large number of through holes is sealed with a sealing material, and the other end side of the remaining through holes is sealed with a sealing material.
  • Patent Documents 1 and 2 disclose a die and an extrusion molding apparatus used for manufacturing a honeycomb structure.
  • a honeycomb filter structure for a diesel particle filter is generally used in a state of being housed in a rigid case. If the dimensional accuracy of the honeycomb filter structure is low, problems such as cracks in the honeycomb filter structure due to thermal stress or the like are likely to occur. Therefore, high dimensional accuracy is required for the green molded body before firing. In addition, some honeycomb structures have a narrow cell pitch (for example, about 1.1 to 2.8 mm), and high dimensional accuracy is required for the thickness of partition walls that define a large number of through holes.
  • the flow rate of the raw material composition reaching the upstream surface of the die is uneven and the flow rate of the raw material composition in a specific region is high compared to other regions.
  • the formed body is extruded from the die. If this is to be corrected straight afterwards, there arises a problem that the partition walls of the molded body are curved or cracks are formed on the outer surface. Further, even if a straight product is obtained at the initial stage when the production of the molded body is started, the bending of the molded body may become gradually noticeable due to die wear or the like.
  • the present invention has been made in view of the above problems, and provides an extrusion molding apparatus capable of efficiently producing a molded body with sufficiently small bending and high dimensional accuracy, and a method for producing a molded body using the same. With the goal.
  • the extrusion molding apparatus includes a flow path for transferring a paste-like raw material composition, a screw provided on the upstream side of the flow path, kneading the raw material composition and transferring it downstream, and a flow path A die provided on the downstream side from which a molded body made of the raw material composition is extruded, a rectifying plate provided between the screw and the die and having a plurality of openings penetrating in the thickness direction, and a downstream side of the rectifying plate and the die A resistance tube that communicates with the resistance tube, a plurality of resistance pins that are provided so as to penetrate through the tube wall of the resistance tube, and the lengths that protrude inside the resistance tube can be changed, respectively, and a means for adjusting the temperature of the plurality of resistance pins Is provided.
  • the plurality of resistance pins provided in the extrusion molding apparatus of the present invention is for uniformizing the flow velocity distribution of the raw material composition introduced into the die. Check the degree and direction of bending of the extruded product, and if bending exceeding the required accuracy is recognized, adjusting the protruding length of each resistance pin makes the bending sufficiently small and the dimensional accuracy is high. A molded object can be manufactured efficiently.
  • the plurality of resistance pins are configured so that the temperature can be adjusted.
  • the temperature of the resistance pin when adjusting the protruding length of the resistance pin, the friction between the resistance pin and the paste-like raw material composition can be reduced to perform the operation smoothly.
  • Specific examples of the means for adjusting the temperature of the resistance pin include a cooling medium circulation jacket, an electric cooler, an electric heater, or a combination thereof.
  • the present invention is a method for producing a molded body using the above extrusion molding apparatus, and provides a method comprising a step of changing the protruding length of a resistance pin whose temperature is adjusted.
  • the method may further comprise the step of changing the temperature of the resistance pin.
  • (A) is a perspective view which shows an example of the green molded object for honeycomb structures
  • (b) is the elements on larger scale of a green molded object.
  • a green molded body 70 shown in FIG. 1 is obtained by extruding a raw material composition.
  • the green molded body 70 is a cylindrical body in which a large number of through holes 70a are arranged substantially in parallel.
  • the cross-sectional shape of the through hole 70a is a square as shown in FIG.
  • the plurality of through holes 70a are arranged in a square arrangement in the green molded body 70, that is, such that the central axis of the through hole 70a is located at the apex of the square.
  • the square size of the cross section of the through hole 70a can be set to, for example, 0.8 to 2.5 mm on a side.
  • a honeycomb structure is manufactured by firing the green molded body 70 at a predetermined temperature.
  • the length of the green molded body 70 in the direction in which the through hole 70a extends is not particularly limited, and can be, for example, 40 to 350 mm. Further, the outer diameter of the green molded body 70 is not particularly limited, and can be, for example, 100 to 320 mm.
  • the inorganic compound source powder when producing a green molded body of aluminum titanate, includes an aluminum source powder such as ⁇ -alumina powder and a titanium source powder such as anatase type or rutile type titania powder. Furthermore, magnesium source powders such as magnesia powder and magnesia spinel powder and / or silicon source powders such as silicon oxide powder and glass frit can be included.
  • organic binder examples include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate.
  • additives examples include pore formers, lubricants and plasticizers, dispersants, and solvents.
  • the solvent examples include alcohols such as methanol, ethanol, butanol, and propanol; glycols such as propylene glycol, polypropylene glycol, and ethylene glycol; and water.
  • the extrusion molding apparatus 10 shown in FIG. 2 is for producing a green molded body 70 from a powdery or pasty raw material composition.
  • the extrusion molding apparatus 10 includes a screw 2A provided at the upper stage in the housing 1 and a screw 2B provided at the lower stage.
  • the screws 2A and 2B are for kneading the raw material composition supplied from the inlet 1a and transferring it downstream through the flow path 1b.
  • a vacuum chamber 3 is provided between the screws 2A and 2B, and the raw material composition can be degassed by reducing the pressure in the vacuum chamber 3.
  • the raw material composition in the vacuum chamber 3 is introduced into the lower screw 2B by the roller 3a.
  • the extrusion molding apparatus 10 includes a rectifying plate 5 provided on the downstream side of the screw 2B, a die 8 from which a molded body 70A made of a raw material composition is extruded, a resistance tube 9 that communicates the flow path 1b and the die 8, and a resistance. It further includes 16 resistance pins P which are provided so as to penetrate the tube wall of the tube 9 and whose lengths protrude inside the resistance tube 9 can be changed (see FIGS. 3 and 5).
  • the resistance tube 9 has a tapered inner flow path, and the flow path cross-sectional area gradually decreases from the upstream side toward the downstream side.
  • the rectifying plate 5 is detachably attached to the housing 1 and is disposed between the screw 2B and the die 8.
  • 4A is a front view of the current plate 5
  • FIG. 4B is a cross-sectional view of the current plate 5.
  • the rectifying plate 5 has a plurality of openings 5a penetrating in the thickness direction.
  • the rectifying plate 5 may have a net-like resistor (not shown) in order to enhance the effect of adjusting the flow rate.
  • the net-like resistor for example, a wire net having a mesh number of 5 to 200 mesh (more preferably 50 to 150 mesh) can be used.
  • the number of meshes (mesh) of the metal mesh here means the number of meshes between 1 inch (25.4 mm).
  • the first condition is that the mesh opening W is small with respect to the die opening (slit width).
  • the rectifying plate 5 is preferably a structure that hardly causes distortion even when pressure is applied from the upstream side.
  • the material of the rectifying plate 5 is preferably carbon steel, for example.
  • suitable materials other than carbon steel include special steels containing nickel, chromium, tungsten and the like.
  • the thickness of the current plate 5 is preferably 10 to 100 mm from the viewpoint of ensuring sufficient strength.
  • the “aperture ratio” means a value calculated by dividing the total area of the openings on one surface of the current plate 5 by the area of the one surface (excluding the peripheral edge covered by the housing). .
  • the total area of the opening may vary depending on the position of the rectifying plate in the thickness direction (feeding direction of the raw material composition). This means a value calculated using the minimum value of the sum.
  • the 16 resistance pins P are provided so as to penetrate the tube wall of the resistance tube 9 as shown in FIGS. 3 and 5, and are arranged at substantially equal intervals in the circumferential direction of the resistance tube 9.
  • the length of the resistance pin P protruding inside the resistance tube 9 can be freely changed.
  • the resistance pin P has a seal mechanism that does not leak the raw material composition from between the resistance pin 9 and the resistance tube 9, and is slidable with respect to the resistance wall 9.
  • a screw rotation type mechanism using a screw provided in the resistance pin P and a screw hole provided in the resistance tube 9 may be used instead of the slide type mechanism.
  • the number of resistance pins P is not limited to 16. However, in order to obtain a sufficient flow rate adjustment effect, it is preferably 6 to 36 per pair.
  • the plurality of resistance pins P are preferably arranged at predetermined positions on the upstream side of the die 8. That is, it is preferable that the central axes of the plurality of resistance pins P are installed in the range of 10 to 100 mm (more preferably 10 to 50 mm) from the upstream surface of the die 8.
  • the protruding length of the resistance pin P can be changed. By increasing the protruding length, the flow rate of the raw material composition flowing through the region can be reduced, and the bending of the green molded body 70 can be reduced.
  • the protruding length can be 0 to 120% (see FIG. 6), preferably 0 to 100%, based on the radius of the position where the resistance pin P of the resistance tube 9 is provided (see FIG. 5). reference).
  • the extruded green molded body 70 when the extruded green molded body 70 is curved upward, it is considered that the flow rate of the raw material composition flowing in the lower region of the resistance tube 9 is higher than the other regions.
  • a plurality of resistance pins P located in the region may be projected.
  • the ratio of the protrusion length (radius reference of the resistance tube 9) is 100% for the resistance pin P1 located at the lower end, 70% for the adjacent resistance pin P2, and further for the adjacent resistance pin.
  • P3 is set to 30%.
  • the green molded body 70 having sufficiently high dimensional accuracy can be continuously manufactured by checking the degree and direction of bending of the extruded molded body and changing the protruding length of each resistance pin P.
  • the resistance pin P is hollow except for the tip portion Pa, and a tube Pc for introducing a refrigerant is inserted into the hollow portion Pb.
  • a refrigerant for example, an antifreeze liquid typified by cold water or an ethylene glycol aqueous solution
  • the resistance pin P is cooled by the refrigerant passing through the hollow portion Pb, and the refrigerant returns to the proximal end side of the resistance pin P.
  • the arrows in FIG. 7 indicate the flow of the refrigerant.
  • the tip portion Pa, the hollow portion Pb, and the pipe Pc constitute a cooling medium circulation jacket (temperature adjusting means) Ptc. It is preferable that all of the resistance pins P (16 in the present embodiment) have the cooling medium circulation jacket Ptc.
  • a plurality of resistance pins P are provided on the tube wall of the resistance tube 9 , but if the position where the plurality of resistance pins are provided is between the rectifying plate 5 and the die 8, It is not limited.
  • a plurality of resistance pins P may be provided on the resistance tube 9 or the extension tube 9a (see FIG. 8).
  • a plurality of resistance pins P may be provided on both the resistance tube 9 and the extension tube 9a.
  • the raw material composition is introduced into the flow path 1b from the inlet 1a.
  • the raw material composition is kneaded and transferred downstream.
  • the kneaded material is passed through the opening 5 a of the rectifying plate 5 to make the flow velocity distribution uniform, and then introduced into the die 8 through the resistance tube 9.
  • the linear velocity of the raw material composition on the downstream side of the die 8 can be about 10 to 150 cm / min.
  • the raw material composition with a uniform flow velocity distribution is extruded from the die 8 and the compact 70A is collected on the support base 15.
  • the green molded body 70 is obtained by cutting the molded body 70A into a predetermined length.
  • a step of changing the protruding length of the resistance pin P is performed.
  • the temperature of the resistor pin P whose protruding length is changed is adjusted to a predetermined temperature by the temperature adjusting means Ptc.
  • the temperature of the resistance pin P is controlled to be equal to or lower than the temperature of the housing 1 or the resistance tube 9, for example. Is preferred.
  • the step of changing the protruding length of the resistance pin P whose temperature has been adjusted can be performed without stopping the supply of the raw material composition to the extrusion molding apparatus 10.
  • the green molded body 70 with sufficiently high dimensional accuracy can be efficiently manufactured over a long period of time without changing or changing the setting of the die 8.
  • an extrusion molding apparatus having a mechanism for automatically controlling the protruding lengths of the plurality of resistance pins P is used, the protruding lengths of the resistance pins P can be automatically changed.
  • the extrusion molding device 20 is a computer 12 that detects the degree and direction of bending of the molded body 70 ⁇ / b> A extruded from the die 8, and a computer that calculates the length of the plurality of resistance pins P to be projected based on data from the sensor 12. 13 and a pin drive mechanism 14 that changes the protruding length of each of the plurality of resistance pins P based on the output from the computer 13.
  • a non-contact type displacement sensor using a laser beam or LED light L, a non-contact type size measuring device, or the like can be used.
  • the pin drive mechanism 14 when the resistance pin P is a slide type or a screw rotation type, a mechanism that reciprocates or rotates the resistance pin P with a gear or the like can be adopted.
  • FIG. 10 is a diagram showing a configuration of a bending detection mechanism when a non-contact type dimension measuring device LS-7000 (trade name, manufactured by Keyence Corporation) is used as the sensor 12.
  • the bending of the molded body 70A is detected by using four sets of sensors (non-contact type dimension measuring devices 12A to 12D) each including a light emitting element 12a that emits laser light or LED light L and a light receiving element 12b.
  • a circle Y consisting of a broken line in FIG. 10 indicates the cross-sectional position of the molded body when a straight molded body 70A is obtained, and a circle N consisting of a solid line indicates the cross-sectional position of the molded body where bending has occurred. is there.
  • Two sets of non-contact type displacement sensors 12A and 12B may be used.
  • FIG. 11 is a diagram showing a configuration of a bending detection mechanism when a non-contact displacement sensor LK-G (trade name, manufactured by Keyence Corporation) is used as the sensor 12.
  • Sixteen non-contact displacement sensors 12a to 12p are arranged so as to surround the molded body 70A.
  • a circle Y consisting of a broken line in FIG. 11 indicates the cross-sectional position of the molded body when a straight molded body 70A is obtained, and a circle N consisting of a solid line indicates the cross-sectional position of the molded body where bending has occurred. is there.
  • the non-contact size measuring device is arranged as shown in FIG. 11, the number thereof is not particularly correlated with the number of resistance pins P, but is preferably larger than the number of resistance pins P. Further, only one of a pair of opposing measuring devices may be used, for example, only measuring devices 12a to 12h shown in FIG.
  • the present invention is not limited to the above-mentioned embodiment.
  • the cylindrical green molded body 70 is illustrated, but the shape and structure of the molded body are not limited thereto.
  • the outer shape of the green molded body 70 may be, for example, a rectangular column such as a quadrangular column or an elliptical column.
  • the arrangement of the through holes 70a may not be a square arrangement, and may be, for example, a substantially triangular arrangement, a substantially hexagonal arrangement, or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

La présente invention se rapporte à un dispositif de moulage par extrusion qui est pourvu : d'un canal destiné à transporter une composition de matière première sous la forme d'une pâte ; d'une vis destinée à mélanger la composition de matière première et à transporter cette dernière vers l'aval et qui est positionnée en amont du canal ; d'une matrice au moyen de laquelle un article moulé qui comprend la composition de matière première, est extrudé et qui est positionnée en aval du canal ; d'un redresseur qui présente une pluralité d'ouvertures qui pénètrent dans le sens de l'épaisseur de ce dernier et qui est positionné entre la vis et la matrice ; d'un tube de résistance destiné à raccorder le côté aval du redresseur et la matrice ; d'une pluralité de broches de résistance qui présentent chacune des longueurs ajustables individuellement qui font saillie à l'intérieur du tube de résistance et qui sont positionnées de sorte à pénétrer dans la paroi tubulaire du tube de résistance ; et d'un moyen destiné à ajuster la température de la pluralité de broches de résistance.
PCT/JP2013/057077 2012-03-16 2013-03-13 Dispositif de moulage par extrusion et procédé permettant de produire un article moulé à l'aide de ce dernier WO2013137346A1 (fr)

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WO2015061184A1 (fr) * 2013-10-23 2015-04-30 Corning Incorporated Dispositif et procédé de correction d'arc d'extrudât
CN110815754A (zh) * 2019-11-24 2020-02-21 六安丰恺尼机电科技有限公司 熔融态聚苯乙烯塑料制造塑料管件的组件
US10632662B2 (en) 2013-10-23 2020-04-28 Corning Incorporated Device and method of correcting extrudate bow
CN111231258A (zh) * 2020-01-21 2020-06-05 瑞瑶环境科技有限公司 一体成型塑料双层螺旋筋中空壁管、成型模具及其生产工艺
CN114347221A (zh) * 2020-10-12 2022-04-15 日本碍子株式会社 挤出成型机及成型体的制造方法

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EP3053721A1 (fr) * 2013-10-04 2016-08-10 Sumitomo Chemical Company Limited Dispositif de moulage par extrusion et procédé de fabrication d'un corps cru moulé en nid d'abeilles

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CN110815754A (zh) * 2019-11-24 2020-02-21 六安丰恺尼机电科技有限公司 熔融态聚苯乙烯塑料制造塑料管件的组件
CN111231258A (zh) * 2020-01-21 2020-06-05 瑞瑶环境科技有限公司 一体成型塑料双层螺旋筋中空壁管、成型模具及其生产工艺
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