WO2015025768A1 - 密閉式混練機 - Google Patents
密閉式混練機 Download PDFInfo
- Publication number
- WO2015025768A1 WO2015025768A1 PCT/JP2014/071222 JP2014071222W WO2015025768A1 WO 2015025768 A1 WO2015025768 A1 WO 2015025768A1 JP 2014071222 W JP2014071222 W JP 2014071222W WO 2015025768 A1 WO2015025768 A1 WO 2015025768A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- kneading
- blades
- shaft end
- kneaded
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/26—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
- B29B7/263—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors from the underside in mixers having more than one rotor and a a casing closely surrounding the rotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
- B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
- B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
- B29B7/186—Rotors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
- B29B7/246—Component parts, details or accessories; Auxiliary operations for feeding in mixers having more than one rotor and a casing closely surrounding the rotors, e.g. with feeding plungers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
- B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
Definitions
- the present invention relates to a closed kneader.
- the hermetic kneader includes a kneading chamber to which a material to be kneaded is supplied and a rotor disposed in the kneading chamber.
- the rotor includes a plurality of kneading blades for kneading the material to be kneaded. When the rotor rotates, the kneading blade kneads the material to be kneaded.
- Patent Document 1 (see FIGS. 2 and 4 of the same document) describes a technique that achieves both the dispersibility and dispersibility of the material to be kneaded by the nonlinear blade (13). .
- the length of the kneading blades (12, 13) in the rotor axial direction is set to 0.65L or 0.7L with respect to the total length (L) of the rotor in the rotor axial direction. It is described.
- Patent Document 2 aims to obtain a kneaded material of good quality by setting the size of the gap (chip clearance) between the top of the kneading blade and the inner surface of the kneading chamber to a predetermined value. The technology is described.
- the length of the kneading blades (13, 14) in the rotor axial direction is set to 0.7 W or 0.65 W with respect to the total length (W) of the rotor in the rotor axial direction. It is described.
- the conventional kneaders 1 and 2 have room for improvement in the distribution performance of the materials to be kneaded. If the distribution performance of the material to be kneaded is low, the kneading time of the material to be kneaded (the time required to bring the material to be kneaded into a desired kneaded state) may be long. Therefore, there is room for improvement in productivity in the closed kneaders of the conventional techniques 1 and 2.
- JP 2002-11336 A Japanese Patent No. 4568785
- An object of the present invention is to provide a closed kneader that can improve the distribution performance of the material to be kneaded, can reduce the kneading time of the material to be kneaded, and can improve the productivity in the closed kneader. It is to be.
- a closed kneading machine includes a kneading chamber to which a material to be kneaded is supplied, and a rotor disposed in the kneading chamber so as to be rotatable around a rotor shaft, A plurality of kneading blades for kneading the material to be kneaded are provided, and the length of all the kneading blades in the rotor axial direction is 45% or less with respect to the total length of the rotor in the rotor axial direction.
- FIG. 1 is a cross-sectional view of a closed kneader 1.
- FIG. FIG. 2 is an overall view of a rotor 50 shown in FIG. 1.
- FIG. 2 is a development view of a rotor 40 and a rotor 50 shown in FIG. 1. It is a graph which shows the relationship between kneading
- the closed kneader 1 shown in FIG. 1 will be described with reference to FIGS.
- the closed kneader 1 is an apparatus for kneading the material to be kneaded.
- the material to be kneaded include a polymer material.
- the polymer material include rubber and resin.
- the material to be kneaded is made of, for example, a rubber compounded with silica, a silane coupling agent, or the like.
- the closed kneader 1 is a batch type.
- the closed kneader 1 includes a supply unit 10 and a kneading unit 30.
- the supply unit 10 is a part that supplies the material to be kneaded to the kneading unit 30.
- the supply unit 10 includes a hopper 11, a material supply cylinder 13, and a cylinder device 20.
- the material to be kneaded is fed into the hopper 11 from the outside of the closed kneader 1.
- the material supply cylinder 13 is a cylinder through which the material to be kneaded can pass.
- the upper part of the space in the material supply cylinder 13 communicates with the space in the hopper 11.
- the cylinder device 20 is a device that pushes the material to be kneaded from the material supply cylinder 13 into the kneading section 30 (kneading chamber 33 described later).
- the cylinder device 20 is a telescopic actuator.
- the cylinder device 20 is, for example, a pneumatic actuator.
- the cylinder device 20 is disposed above the material supply cylinder 13.
- the cylinder device 20 includes a cylinder 21, a piston 23, a piston rod 25, and a floating weight 27.
- the cylinder 21 is made of a cylindrical member.
- the piston 23 is a member that can reciprocate in the cylinder 21.
- the piston rod 25 is a rod connected to the piston 23.
- the piston rod 25 penetrates the lower lid of the cylinder 21 (the lid portion at the lower end of the cylinder 21) in an airtight manner.
- the floating weight 27 is a member that pushes the material to be kneaded from the supply unit 10 toward the kneading unit 30 (downward).
- the floating weight 27 is disposed in the material supply cylinder 13.
- the floating weight 27 is connected to the piston rod 25.
- the floating weight 27 is movable in the axial direction (vertical direction) of the material supply cylinder 13.
- the kneading part 30 is a part for kneading the material to be kneaded.
- the kneading unit 30 is disposed below the supply unit 10 and connected to the supply unit 10.
- the kneading unit 30 includes a chamber 31, a drop door 35, and rotors 40 and 50.
- the chamber 31 is a portion in which a kneading chamber 33 is formed.
- a kneading chamber 33 In the upper part of the chamber 31, an upper supply port for communicating the lower part of the space in the material supply cylinder 13 and the kneading chamber 33 is formed.
- a bottom outlet At the bottom of the chamber 31 is formed a bottom outlet that communicates the outside of the closed kneader 1 with the kneading chamber 33.
- the kneading chamber 33 is a space (section) to which the material to be kneaded is supplied.
- the kneading chamber 33 is a space where the material to be kneaded is kneaded.
- the vertical cross section of the kneading chamber 33 is an eyebrows type. This longitudinal section corresponds to a section viewed from a rotor axial direction Z (see FIG. 2) described later.
- the drop door 35 opens and closes (opens and closes) the bottom outlet of the chamber 31.
- the drop door 35 is driven by an actuator to open and close the bottom outlet.
- the actuator that drives the drop door 35 is, for example, a rotary actuator (rotary actuator).
- the rotors 40 and 50 are arranged in the kneading chamber 33.
- the rotors 40 and 50 have a substantially cylindrical shape.
- Two rotors 40 and 50 are provided in the kneading chamber 33. That is, the closed kneader 1 is a biaxial type.
- the central axis of the rotor 40 (substantially cylindrical central axis) corresponds to the rotor axis 40 a of the rotor 40.
- the central axis of the rotor 50 (substantially cylindrical central axis) corresponds to the rotor axis 50 a of the rotor 50.
- the rotor 40 and the rotor 50 include kneading blades 61 to 66, respectively.
- the two rotors 40 and 50 are provided in a pair of left and right. As shown in FIG. 1, the rotor 40 and the rotor 50 are disposed such that the rotor shaft 40a and the rotor shaft 50a are parallel to each other. The rotor shaft 40a and the rotor shaft 50a are arranged on the same plane parallel to the horizontal plane. The rotor 40 and the rotor 50 are arranged with a space therebetween.
- the number of rotors provided in the closed kneader 1 may be only one. That is, the closed kneader 1 may be a uniaxial type.
- the closed kneader 1 includes two rotors 40 and 50 will be described.
- the two rotors 40 and 50 rotate in different directions so that the inner portions of the rotors 40 and 50 move downward.
- the inner portions of the rotors 40 and 50 are portions of the rotors 40 and 50 that are located between the rotor shaft 40a and the rotor shaft 50a.
- the rotor 40 is rotatable about the rotor shaft 40a.
- the rotor 50 is rotatable about the rotor shaft 50a.
- the kneading blades 61 to 66 of the two rotors 40 and 50 do not mesh with each other. That is, the closed kneader 1 is a non-meshing type.
- the developed shapes of the two rotors 40 and 50 are point-symmetric with each other as shown in FIG. More specifically, the shape of the rotor 40 when the rotor 40 is deployed around the rotor shaft 40a (see FIG. 1) is the developed shape D40, and the rotor 50 when the rotor 50 is deployed around the rotor shaft 50a (see FIG. 1). This shape is defined as a developed shape D50. Then, the developed shape D40 and the developed shape D50 are point-symmetric with respect to the center point O. The arrangement of the kneading blades 61 to 66 in the developed shape D40 and the arrangement of the kneading blades 61 to 66 in the developed shape D50 are symmetrical with respect to the center point O. Below, one rotor 50 is demonstrated among the two rotors 40 and 50, and description of the rotor 40 is abbreviate
- the rotor rotation direction R the front side of the rotation of the rotor 50 is a front side Rf
- the rear side of the rotation of the rotor 50 is a rear side Rr.
- a direction in which the rotor shaft 50a of the rotor 50 extends is defined as a rotor axial direction Z.
- One side in the rotor axial direction Z is defined as a first shaft end side Z1.
- the other side in the rotor axial direction Z is defined as a second shaft end side Z2. That is, the second shaft end side Z2 is the side opposite to the first shaft end side Z1 in the rotor axial direction Z.
- the total length W of the rotor 50 in the rotor axial direction Z is defined as a total length W.
- the rotor 50 has a first shaft end 51 and a second shaft end 52.
- the first shaft end 51 is one end portion of the rotor 50 in the rotor axial direction Z.
- the first shaft end 51 is an end portion of the rotor 50 on the first shaft end side Z1.
- the second shaft end 52 is the other end of the rotor 50 in the rotor axial direction Z.
- the second shaft end 52 is an end portion of the rotor 50 on the second shaft end side Z2. That is, the second shaft end 52 is an end portion on the opposite side to the first shaft end 51 in the rotor axial direction Z.
- the kneading blades 61 to 66 are blades (wings) for kneading the material to be kneaded.
- a plurality of kneading blades 61 to 66 are provided on the rotor 50. Specifically, the number of kneading blades 61 to 66 of one rotor 50 is six. The number of kneading blades 61 to 66 of one rotor 50 may be 7 or more and 5 or less (not shown).
- the kneading blades 61 to 66 are configured such that a gap (chip clearance) is formed between the inner surface of the chamber 31 surrounding the kneading chamber 33 (see FIG. 1) and the top of the kneading blades 61 to 66.
- the top is the tip of the kneading blades 61-66.
- the tip portions of the kneading blades 61 to 66 are the outer end portions of the kneading blades 61 to 66 in the diameter direction of the substantially cylindrical rotor 50.
- the kneading blades 61 to 66 are configured to apply a shearing force to the material to be kneaded that passes through the chip clearance when the rotor 50 rotates.
- the kneading blades 61 to 66 are configured such that the material to be kneaded moves (flows) in the rotor axial direction Z by pushing the material to be kneaded when the rotor 50 rotates.
- the kneading blades 61 to 66 have a helically twisted shape with the rotor shaft 50a as the central axis.
- the tops of the kneading blades 61 to 66 are spiral with the rotor shaft 50a as the central axis.
- the kneading blades 61 to 66 are linear blades.
- the linear blade is a linear (straight) blade in the developed shape D50 of the rotor 50. Note that at least a part of the kneading blades 61 to 66 may be nonlinear blades (not shown).
- the length Lz in the rotor axial direction Z of all the kneading blades 61 to 66 is 45% or less with respect to the total length W of the rotor 50 in the rotor axial direction Z (Lz ⁇ 0.45 W).
- the length Lz1 of each of the kneading blades 61 and 62 is 45% or less with respect to the total length W.
- the length Lz3 of each of the kneading blades 63 and 64 is 45% or less with respect to the total length W.
- the length Lz5 of each of the kneading blades 65 and 66 is 45% or less with respect to the total length W.
- the plurality of kneading blades 61 to 66 include blades whose starting points (described later) are arranged at mutually different shaft ends (first shaft end 51 and second shaft end 52).
- the plurality of kneading blades 61 to 66 include a first shaft end side blade (kneading blades 61 and 62), a second shaft end side blade (kneading blades 63 and 64), There is.
- the plurality of kneading blades 61 to 66 include central blades (kneading blades 65 and 66) that are not in contact with either the first shaft end 51 or the second shaft end 52.
- the first shaft end side blades are blades in which the end portions (start points 61s and 62s) of the front side Rf in the rotor rotation direction R are arranged at the first shaft end 51.
- the first shaft end side blades (kneading blades 61 and 62) flow the material to be mixed from the first shaft end 51 to the second shaft end side Z2 when the rotor 50 rotates.
- a plurality of (two or more) first shaft end side blades (kneading blades 61 and 62) are provided.
- two first shaft end side wings are provided.
- the length Lz1 of the two first shaft end side blades (mixing blades 61 and 62) is the same.
- the angles of the two first shaft end side blades (mixing blades 61 and 62) with respect to the rotor rotation direction R are the same.
- the second shaft end side blades are blades in which the end portions (start points 63s and 64s) of the front side Rf in the rotor rotation direction R are arranged at the second shaft end 52.
- the second shaft end side blades flow the material to be mixed from the second shaft end 52 to the first shaft end side Z1 when the rotor 50 rotates.
- a plurality of second shaft end side blades are provided, for example, two.
- the lengths Lz3 of the two second shaft end side blades (mixing blades 63 and 64) are the same.
- the central blade (kneading blades 65 and 66) is disposed only on the second shaft end side Z2 from the first shaft end 51 and is disposed only on the first shaft end side Z1 from the second shaft end 52.
- the central blades (kneading blades 65 and 66) are disposed on the second shaft end side Z2 of the first shaft end side blades (mixing blades 61 and 62).
- the central blades (mixing blades 65 and 66) are arranged on the first shaft end side Z1 of the second shaft end side blades (mixing blades 63 and 64).
- the central blade When the rotor 50 rotates, the central blade (mixing blades 65 and 66) has a second shaft end from the first shaft end side blades (mixing blades 61 and 62) toward the second shaft end side blades (mixing blades 63 and 64).
- the material to be kneaded is flowed to the side Z2.
- the central blades (mixing blades 65 and 66) may be configured to flow the material to be mixed to the first shaft end side Z1 when the rotor 50 rotates (not shown).
- a plurality of central blades (mixing blades 65 and 66) are provided. For example, two central wings are provided. The length Lz5 of the two central blades (mixing blades 65 and 66) is the same.
- the kneading blades 61 to 66 include blades having different lengths Lz.
- the plurality of kneading blades 61 to 66 include a short blade and a long blade whose length Lz is larger than the length of the short blade.
- the length Lz5 of the central blade (mixing blades 65 and 66) is larger than the length Lz1 of the first shaft end side blades (mixing blades 61 and 62), and the length of the second shaft end side blades (mixing blades 63 and 64). Larger than Lz3.
- the length Lz3 of the second shaft end side blades (mixing blades 63 and 64) is larger than the length Lz1 of the first shaft end side blades (mixing blades 61 and 62).
- a plurality of short blades (for example, kneading blades 61 and 62) are provided.
- two short blades are provided.
- a plurality of long blades (for example, kneading blades 63 and 64) are provided.
- two long wings are provided.
- the plurality of kneading blades 61 to 66 are arranged at intervals (spaces) in the rotor rotation direction R.
- the plurality of kneading blades 61 to 66 include a front blade and a rear blade.
- the front wing is a kneading wing 63.
- the front wing (kneading wing 63) has a front wing end point 63e.
- the front blade end point 63e is an end portion of the rear side Rr of the front blade (mixing blade 63) in the rotor rotation direction R.
- the rear blade (mixing blade 65) is adjacent to the rear side Rr (directly behind) the front blade end point 63e.
- the rear blade (kneading blade 65) and the front blade end point 63e are arranged with a distance ⁇ 1 from each other in the rotor rotation direction R.
- an interval ⁇ 1 is provided between the front blade end point 63e and the portion of the rear blade (mixing blade 65) that is located immediately behind the front blade end point 63e in the rotor rotation direction R.
- the size of the interval ⁇ 1 corresponds to a predetermined phase difference in the range of 40 ° to 160 ° in terms of the phase difference around the rotor shaft 50a (see FIG. 2). That is, the size of the interval ⁇ 1 corresponds to a predetermined phase difference of 40 ° or more and 160 ° or less in the phase difference around the rotor shaft 50a.
- the front blade is the kneading blade 65
- the rear blade is the kneading blade 64.
- the front wing (mixing wing 65) has a front wing end point 65e.
- the front blade end point 65e is an end portion of the rear side Rr of the front blade (mixing blade 65) in the rotor rotation direction R.
- the rear blade (kneading blade 64) is adjacent to the rear side Rr (directly behind) the front blade end point 65e.
- the rear wing (kneading wing 64) and the front wing end point 65e are arranged at a distance ⁇ 2 from each other in the rotor rotation direction R.
- an interval ⁇ 2 is provided between the front blade end point 65e and the portion of the rear blade (mixing blade 64) located immediately behind the front blade end point 65e in the rotor rotation direction R.
- An interval ⁇ 2 in the rotor rotation direction R between the rear blade (mixing blade 64) and the front blade end point 65e is a predetermined phase difference within a range of 40 ° to 160 ° in phase difference around the rotor shaft 50a (see FIG. 2). Equivalent to. Such a phase difference condition is satisfied, for example, between all the kneading blades 61-66.
- the floating weight 27 moves (lowers) to the kneading part 30 side.
- the material to be kneaded is pushed into the kneading chamber 33 from the material supply cylinder 13 (loaded or press-fitted).
- the upper supply port of the chamber 31 is closed by the floating weight 27.
- the rotors 40 and 50 rotate in opposite directions. As a result, when the material to be kneaded passes through the gap (chip clearance) between the inner surface of the chamber 31 and the tops of the kneading blades 61 to 66 (see FIG. 2), a shearing force is applied to the material to be kneaded.
- the material to be kneaded is moved in the rotor axial direction Z by being pushed by the kneading blades 61 to 66 (see FIG. 2). Further, the material to be kneaded moves between the two rotors 40 and 50. As a result, the material to be kneaded is uniformly dispersed.
- G When the materials to be kneaded are kneaded for a predetermined time, the materials to be kneaded are in a desired kneaded state.
- the drop door 35 is separated (separated) from the chamber 31. As a result, the bottom outlet of the chamber 31 is opened. As a result, the kneaded material (kneaded material to be kneaded) is discharged to the outside of the closed kneader 1.
- the kneading blades (61 to 66) used for evaluating the distribution performance are as follows (A) to (C).
- the kneading blade described in the above-mentioned Prior Art 1 (JP 2002-11336).
- the kneading blades of the prior art 1 have one nonlinear blade and three linear blades per rotor.
- the kneading blade of Prior Art 1 includes a linear blade whose length Lz in the rotor axial direction Z is 70% of the total length W of the rotor.
- the rotor of the prior art 1 has a nonlinear blade having a length Lz of 65% of the total length W.
- the maximum value of the length Lz of the plurality of kneading blades 61 to 66 is 45% of the total length W.
- the maximum value of the length Lz of the plurality of kneading blades 61 to 66 is 43% of the total length W.
- the maximum value of the length Lz of the plurality of kneading blades 61 to 66 is 40% of the total length W.
- the three types of kneading blades 61 to 66 (C1), (C2), and (C3) are all linear blades.
- the material to be kneaded is a mixture of beads in a 30% aqueous solution of carboxymethyl cellulose (CMC).
- FIG. 4 shows the results of evaluation of distribution performance.
- FIG. 4 is a graph showing the relationship between the kneading time (horizontal axis) and the CV value (vertical axis). 5 and 6 are also graphs showing the relationship between the kneading time and the CV value. CV is an abbreviation for coefficient of variation. Details of the CV value will be described later.
- the prior art 1 and the above B: [49%]
- the CV value is a value serving as an index representing the degree of dispersion of components in the material to be kneaded.
- This CV value is obtained by the following equation (1).
- CV is a CV value.
- M is an average value of the mass fractions of the components in the material to be kneaded accommodated in the kneading chamber 33 (see FIG. 1).
- ⁇ is the standard deviation of the mass fraction of the components in the material to be kneaded accommodated in the kneading chamber 33.
- Table 1 shows the composition of the materials to be kneaded.
- PHR Parts per hundred rubber
- SBR is styrene butadiene rubber.
- BR is butadiene rubber.
- Figures 5 and 6 show the results of evaluation of distribution performance. From these graphs, it can be seen that the kneading blades 61 to 66 having the length Lz of 45% or less of the total length W can improve the distribution performance particularly in the initial kneading time (such as kneading time less than 50 seconds) as compared with the prior art 1. It was.
- the closed kneader 1 includes a kneading chamber 33 to which a material to be kneaded is supplied, and a rotor 50 disposed in the kneading chamber 33 so as to be rotatable around a rotor shaft 50a.
- the rotor 50 includes a plurality of kneading blades 61 to 66 for kneading the material to be kneaded.
- the distribution performance can be improved as compared with the above-described conventional technology 1 and the like (conventional technology 1 and those having a length Lz exceeding 45% with respect to the total length W). Yes (see Experiment 1 and Experiment 2 above). Therefore, in the closed kneader 1, the material to be kneaded can be brought into a desired kneading state in a time earlier than the prior art 1 or the like. As a result, the kneading time (kneading time) of the material to be kneaded can be shortened. As a result, the productivity in the closed kneader 1 can be improved as compared with the prior art 1 and the like.
- the plurality of kneading blades 61 to 66 include a short blade (for example, the kneading blades 61 and 62) and the length of the short blade (the kneading blades 61 and 62) in the rotor axial direction Z. And long blades having a large length Lz (for example, kneading blades 63 and 64).
- [Composition 2-1] complicates the flow of the material to be kneaded as compared with the case where there is only one type of length Lz of the plurality of kneading blades 61-66. Furthermore, according to the above [Configuration 2-2], compared to the case where only one short blade (for example, the kneading blades 61 and 62) is provided, or the case where only one long blade (for example, the kneading blades 63 and 64) is provided, The flow of the material to be kneaded becomes complicated. Therefore, the distribution performance of the material to be kneaded can be further improved. As a result, the kneading time of the material to be kneaded can be further shortened. As a result, the productivity in the closed kneader 1 can be further improved.
- the rotor 50 includes a first shaft end 51 that is one end portion of the rotor 50 in the rotor axial direction Z, and a second shaft end 52 that is the other end portion of the rotor 50 in the rotor axial direction Z.
- the plurality of kneading blades 61 to 66 include a first shaft end side blade (kneading blades 61 and 62) and a second shaft end side blade (kneading blades 63 and 64).
- the first shaft end side blades are blades whose front end portions (ends of the front side Rf, start points 61s and 62s) in the rotor rotation direction R are disposed at the first shaft end 51. It is.
- the second shaft end side blade (mixing blade 63, 64) is a blade whose front end portion (front Rf end portion, start point 63s, 64s) in the rotor rotation direction R is disposed at the second shaft end 52. is there.
- the material to be kneaded moves from the first shaft end 51 to the second shaft end side Z2 by the first shaft end side blades (mixing blades 61 and 62) of [Configuration 3-1]. Further, the material to be kneaded is moved from the second shaft end 52 to the first shaft end side Z1 by the second shaft end side blades (mixing blades 63 and 64) of [Configuration 3-2]. Therefore, the material remaining (the material to be kneaded remains) at the first shaft end 51 and the second shaft end 52 can be suppressed.
- the rotor 50 includes a first shaft end 51 and a second shaft end 52.
- the plurality of kneading blades 61 to 66 are disposed only on the second shaft end side Z2 from the first shaft end 51, and are disposed only on the first shaft end side Z1 from the second shaft end 52. There are central blades (kneading blades 65 and 66).
- the plurality of kneading blades 61 to 66 include a front blade (for example, kneading blade 63) and a rear blade (for example, kneading blade 65).
- the rear blade (mixing blade 65) is adjacent to the rear side Rr in the rotor rotation direction R with respect to the front blade end point 63e, which is the rear end portion of the front blade (mixing blade 63) in the rotor rotation direction R.
- the kneading blades 61 to 66 can be easily manufactured as compared with the case where the development shape of at least a part of the kneading blades 61 to 66 is non-linear (see the prior art 1). Nevertheless, as described above (Effect 1), the distribution performance of the material to be kneaded can be improved as compared with the prior art 1.
- the closed kneading machine includes a kneading chamber to which a material to be kneaded is supplied, and a rotor disposed in the kneading chamber so as to be rotatable around a rotor shaft, A plurality of kneading blades for kneading the material to be kneaded are provided, and the length of each of the kneading blades in the rotor axial direction is 45% or less with respect to the total length of the rotor in the rotor axial direction.
- the plurality of kneading blades include two or more short blades and two or more long blades, and any one of the lengths of the long blades in the rotor axial direction is It is preferable that the length of each of the short blades in the rotor axial direction is larger than any one of the lengths.
- the rotor includes a first shaft end that is one end portion of the rotor in the rotor axial direction, and a second shaft end that is the other end portion of the rotor in the rotor axial direction.
- the plurality of kneading blades are arranged such that a front end portion in the rotation direction of the rotor is disposed at the first shaft end side, and a front end portion in the rotation direction of the rotor is disposed at the second shaft end.
- a second shaft end side wing wing.
- the rotor includes a first shaft end that is one end portion of the rotor in the rotor axial direction, and a second shaft end that is the other end portion of the rotor in the rotor axial direction.
- the plurality of kneading blades include a central blade disposed only on the second shaft end side with respect to the first shaft end and disposed only on the first shaft end side with respect to the second shaft end. It is preferable.
- the plurality of kneading blades are adjacent to the rear side in the rotation direction of the rotor with respect to the front blade and a front blade end point that is a rear end portion of the front blade in the rotation direction of the rotor.
- the front wing end point and the rear wing are spaced apart from each other in the rotational direction of the rotor, and the size of the interval between the front wing end point and the rear wing is: It is preferable that the phase difference around the rotor axis corresponds to 40 ° to 160 °.
- the distribution performance of the material to be kneaded can be improved, the kneading time of the material to be kneaded can be shortened, and the productivity in the closed kneader can be improved.
Abstract
Description
図2に示すように、全ての混練翼61~66のロータ軸方向Zにおける長さLzは、ロータ軸方向Zにおけるロータ50の全長Wに対して45%以下である(Lz≦0.45W)。混練翼61・62それぞれの長さLz1は、全長Wに対して45%以下である。混練翼63・64それぞれの長さLz3は、全長Wに対して45%以下である。混練翼65・66それぞれの長さLz5は、全長Wに対して45%以下である。
複数の混練翼61~66には、互いに異なる軸端(第一軸端51及び第二軸端52)に始点(後述)が配置される翼がある。具体的には、図3に示すように、複数の混練翼61~66には、第一軸端側翼(混練翼61・62)と、第二軸端側翼(混練翼63・64)と、がある。また、複数の混練翼61~66には、第一軸端51及び第二軸端52のどちらにも接していない中央翼(混練翼65・66)がある。
複数の混練翼61~66には、互いに長さLzが異なる翼がある。複数の混練翼61~66には、短翼と、その長さLzが短翼の長さよりも大きい長翼と、がある。中央翼(混練翼65・66)の長さLz5は、第一軸端側翼(混練翼61・62)の長さLz1よりも大きく、第二軸端側翼(混練翼63・64)の長さLz3よりも大きい。第二軸端側翼(混練翼63・64)の長さLz3は、第一軸端側翼(混練翼61・62)の長さLz1よりも大きい。
複数の混練翼61~66は、ロータ回転方向Rに互いに間隔(スペース)を開けて配置される。具体的には、複数の混練翼61~66には、前翼と後翼とがある。
図1に示す密閉式混練機1の動作は次の(a)~(h)の通りである。(a)ドロップドア35がチャンバ31に密接させられる。その結果、チャンバ31の底部排出口が閉じられる。(b)シリンダ21の下部が加圧される。その結果、フローティングウェイト27が、チャンバ31から供給部10側に移動(上昇)する。その結果、チャンバ31の上部供給口が開く。(c)被混練材料が、密閉式混練機1の外部からホッパ11を介して材料供給筒13内に供給される。(d)シリンダ21の上部が加圧される。その結果、フローティングウェイト27が混練部30側に移動(下降)する。その結果、被混練材料が、材料供給筒13内から混練室33内に押し込まれる(装填又は圧入される)。(e)チャンバ31の上部供給口が、フローティングウェイト27により閉じられる。(f)ロータ40・50が互いに逆方向に回転する。その結果、チャンバ31の内面と混練翼61~66(図2参照)の頂部との隙間(チップクリアランス)を被混練材料が通るときに、被混練材料にせん断力が加えられる。また、被混練材料が、混練翼61~66(図2参照)に押されることで、ロータ軸方向Zに移動する。また、被混練材料が、2つのロータ40・50間で移動する。これらの結果、被混練材料が均一に分散していく。(g)被混練材料の混練が所定時間行われると、被混練材料が所望の混練状態となる。(h)ドロップドア35がチャンバ31から離される(離隔される)。その結果、チャンバ31の底部排出口が開かれる。その結果、混練物(混練済みの被混練材料)が密閉式混練機1の外部に排出させられる。
図2に示す混練翼61~66、及び比較例の混練翼(61~66)について、分配性能(被混練材料中における成分の分散度合い)を調べた。
図2に示す長さLzが全長Wの45%以下である混練翼61~66の分配性能と、上記「(A:[従来技術1])」の混練翼の分配性能とを比較した。
図1に示す密閉式混練機1による効果を説明する。密閉式混練機1は、被混練材料が供給される混練室33と、ロータ軸50aを中心に回転自在となるように混練室33内に配置されるロータ50と、を備える。図2に示すように、ロータ50は、被混練材料を混練するための複数の混練翼61~66を備える。
[構成2-1]複数の混練翼61~66には、短翼(例えば混練翼61・62)と、ロータ軸方向Zにおける短翼(混練翼61・62)の長さよりもロータ軸方向Zにおける長さLzが大きい長翼(例えば混練翼63・64)と、がある。
ロータ50は、ロータ軸方向Zにおけるロータ50の一端部である第一軸端51と、ロータ軸方向Zにおけるロータ50の他端部である第二軸端52と、を備える。図3に示すように、複数の混練翼61~66には、第一軸端側翼(混練翼61・62)と第二軸端側翼(混練翼63・64)とがある。
ロータ50は、第一軸端51と、第二軸端52と、を備える。
複数の混練翼61~66には、前翼(例えば混練翼63)と、後翼(例えば混練翼65)と、がある。後翼(混練翼65)は、ロータ回転方向Rにおける前翼(混練翼63)の後端部である前翼終点63eに対して、ロータ回転方向Rにおける後側Rrに隣接する。
[構成6]全ての混練翼61~66の展開形状は線形である。
前記実施形態をまとめると、以下の通りである。
Claims (5)
- 被混練材料が供給される混練室と、
ロータ軸を中心に回転自在となるように前記混練室内に配置されるロータと、を備え、
前記ロータは、前記被混練材料を混練するための複数の混練翼を備え、
全ての前記混練翼それぞれのロータ軸方向における長さは、前記ロータ軸方向における前記ロータの全長に対して45%以下である、密閉式混練機。 - 請求項1に記載の密閉式混練機において、
前記複数の混練翼は、
2枚以上の短翼と、
2枚以上の長翼と、を含み、
前記ロータ軸方向における前記長翼の各々の長さのいずれかは、前記ロータ軸方向における前記短翼の各々の長さのいずれかよりも大きい、密閉式混練機。 - 請求項1または2に記載の密閉式混練機において、
前記ロータは、
前記ロータ軸方向における前記ロータの一端部である第一軸端と、
前記ロータ軸方向における前記ロータの他端部である第二軸端と、を備え、
前記複数の混練翼は、前記ロータの回転方向における前端部が前記第一軸端に配置される第一軸端側翼と、前記ロータの回転方向における前端部が前記第二軸端に配置される第二軸端側翼と、を含む、密閉式混練機。 - 請求項1~3のいずれか1項に記載の密閉式混練機において、
前記ロータは、
前記ロータ軸方向における前記ロータの一端部である第一軸端と、
前記ロータ軸方向における前記ロータの他端部である第二軸端と、を備え、
前記複数の混練翼は、前記第一軸端よりも前記第二軸端側のみに配置され、かつ、前記第二軸端よりも前記第一軸端側のみに配置される中央翼を含む、密閉式混練機。 - 請求項1~4のいずれか1項に記載の密閉式混練機において、
前記複数の混練翼は、
前翼と、
前記ロータの回転方向における前記前翼の後端部である前翼終点に対して前記ロータの回転方向で後側に隣接する後翼と、を含み、
前記前翼終点と前記後翼とは、前記ロータの回転方向において互いに間隔をあけて配置され、
前記前翼終点と前記後翼との間の間隔の大きさは、前記ロータ軸回りの位相差で40°~160°の範囲内の所定の位相差に相当する、密閉式混練機。
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KR1020167006892A KR101803669B1 (ko) | 2013-08-20 | 2014-08-11 | 밀폐식 혼련기 |
CN201480046200.9A CN105473298B (zh) | 2013-08-20 | 2014-08-11 | 密闭式混合搅拌机 |
EP14838198.1A EP3037232B1 (en) | 2013-08-20 | 2014-08-11 | Internal mixer |
ES14838198T ES2704890T3 (es) | 2013-08-20 | 2014-08-11 | Mezcladora interna |
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US20160200001A1 (en) | 2016-07-14 |
US10160140B2 (en) | 2018-12-25 |
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KR101803669B1 (ko) | 2017-11-30 |
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