CN106313476A - Smelting rotor element for twin-screw extruder and screw combination - Google Patents

Smelting rotor element for twin-screw extruder and screw combination Download PDF

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Publication number
CN106313476A
CN106313476A CN201510341811.2A CN201510341811A CN106313476A CN 106313476 A CN106313476 A CN 106313476A CN 201510341811 A CN201510341811 A CN 201510341811A CN 106313476 A CN106313476 A CN 106313476A
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CN
China
Prior art keywords
screw
district
mixing
smelting
rotor element
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Pending
Application number
CN201510341811.2A
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Chinese (zh)
Inventor
杨桂生
聂朋辉
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Hefei Genius New Materials Co Ltd
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Hefei Genius New Materials Co Ltd
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Priority to CN201510341811.2A priority Critical patent/CN106313476A/en
Publication of CN106313476A publication Critical patent/CN106313476A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B29C48/57—Screws provided with kneading disc-like elements, e.g. with oval-shaped elements
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/402—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention relates to a smelting rotor element for a twin-screw extruder and a screw combination of the twin-screw extruder. The smelting rotor element is composed of a forward large lead element and a reverse large lead element. The screw combination is provided with a conveying section and a smelting section which are engaged with each other. The smelting section has larger interface replacement and longer staying time compared with the conveying section, and the screw combination is integrally constructed through the conveying section and the smelting section. The smelting rotor element guided in the screw combination can reduce shearing of screws on materials, shearing heat is reduced, the stretching mixing is improved so as to obtain the high smelting quality, accordingly, the using performance of the materials is improved, energy consumption can be reduced, and productivity is improved.

Description

A kind of mixing rotor element for double screw extruder and screw combinations
Technical field
The invention belongs to plastic processing machinery, relate to a kind of double screw extruder, be specifically related to a kind of mixing rotor element for double screw extruder and the screw combinations of double screw extruder.
Background technology
Extruder is a kind of common plastic processing machinery equipment, is widely used in blended, filling-modified, enhancing modified and the extrusion molding of polymer.Extruder is divided into single screw extrusion machine, double screw extruder and multi-screw extruder by the quantity of its screw rod.Wherein, the feeding characteristic of double screw extruder is good, it is adaptable to raw material processing, and compares single screw extrusion machine and have the most mixing, aerofluxus, reaction and self-cleaning function.Additionally, double screw extruder at the plastics of processing heat stability difference and has significant advantage during blend composition.Therefore, in recent years, polytype double screw extruder is occurred in that, such as engagement equidirectional parallel double-screw extruder, non-engagement equidirectional parallel double-screw extruder and antiparallel double screw extruder etc..
Engagement equidirectional parallel double-screw extruder is mainly used in the mixing of material and molding, and it includes machine barrel and is located at the screw rod within machine barrel, and wherein, screw rod includes mixing elements and mandrel, and mixing elements is socketed in mandrel.At present, common mixing elements has kneading block and conveying screwing element, and in actual screws is applied, kneading block is used widely because its melting effect is better than screwing element.But kneading block has Strong shear, shearing can produce substantial amounts of shear heat, and for material and the glass fiber reinforced materials of poor heat stability, too strong shearing can cause material degradation, glass diameter too short, reduces serviceability.
Summary of the invention
The technical problem to be solved in the present invention is aiming at engaging the drawbacks described above that in equidirectional parallel double-screw extruder screw combinations, kneading block exists, a kind of screw combinations for double screw extruder is provided, this screw combinations is possible not only to reduce and shears, and high mixing can be obtained, reduce energy consumption, improve production capacity.
A kind of mixing rotor element for double screw extruder of the present invention, is made up of forward large pitch element and reverse large pitch element, and described forward large pitch element uses specular to be connected with reverse large pitch element；Forward large pitch element and reverse large pitch element are the threaded element of tool.
Described forward large pitch element and the helical pitch of reverse large pitch element are 100-200mm, a length of 20-50mm, preferably helical pitch are 140-160mm, a length of 20-50mm.Positive and negative large pitch has the strongest positive and negative conveying function, improves stretching mixing；
It is provided with the screw combinations of mixing rotor element described above, including two parallel, homodromal screw rods, two described screw rods set transportation section and mixing section, and described transportation section is constituted by having threaded delivery element, and described mixing section is made up of mixing rotor element and kneading block.
In described screw combinations, mixing section is at least provided with one group of mixing rotor element.
Described screw combinations by carrying screwing element, mixing rotor element, kneading block is alternately arranged constitutes.Conveying screwing element, mixing rotor element, kneading block can have different lead, can set according to concrete required product.
The mixing rotor element for double screw extruder of the present invention and double screw extruder, wherein, mixing section constructs screw combinations than what there were the displacement of bigger interface and the longer time of staying, transportation section and a mixing section one in transportation section.
It is in place of the excellence of the present invention:
1, the screw thread combination of the present invention introduces mixing rotor element and can reduce the kneading block shearing to material, reduce shear heat.
2, stretching mixing is improved, to obtain the serviceability of good mixing quality raising material.
3, reduce energy consumption, improve production capacity, save production cost.
The mixing rotor element introduced in the screw combinations of the present invention can reduce the screw rod shearing to material, reduces shear heat, improves stretching mixing, to obtain good mixing and then to improve the serviceability of material and capable of reducing energy consumption, improves production capacity.
Accompanying drawing explanation
Figure 1Two groups of mixing rotor component structure signals in combining for twin screwFigure；
Figure 2For kneading block structural representationFigure；
Figure 3For conveying screwing element structural representationFigure；
Figure 4Illustrate for screw stem combined structureFigure；
Figure In, each name reference numerals: 1 feed opening, 2 glass fiber openings, 3, air vent, 4, forward large pitch element, 5, reverse large pitch element, 10 M160/28,10 ' M160/28L, 11 M160/40,11 ' M160/40L, 20 conveying screwing elements, 30, kneading block.
Detailed description of the invention
Below in conjunction with some embodiments, the invention will be further described with comparative example.Following example are the typical case of the present invention, and protection scope of the present invention is not limited thereto.M160/40 instructs the forward large pitch element of journey 160mm length 40mm, M160/28 instructs the forward large pitch element of journey 160mm length 28mm, M160/40L instructs the reverse large pitch element of journey 160mm length 40mm, and M160/28L instructs the reverse large pitch element of journey 160mm length 28mm.
Such as figure 1, the mixing rotor element of the present invention forms for being used specular to be connected by forward large pitch element with reverse large pitch element.Such as figure 4, it is provided with the screw combinations of mixing rotor element, including two parallel, homodromal screw rods, two described screw rods set transportation section and mixing section, and transportation section is constituted by having threaded delivery element, and mixing section is made up of mixing rotor element and kneading block.In this screw combinations, mixing section can at least provided with one group of mixing rotor element, this screw combinations by the delivery element with different lead, mixing rotor element, kneading block is alternately arranged constitutes.
Experiment is implemented: the axle turned uses the screw combinations with mixing rotor element of the present invention to carry out extrusioning experiment, specific experiment such as under, number described in example is weight portion:
The material of embodiment 1 and comparative example 1-3 is as follows:
Polypropylene
Chopped glass fiber
Antioxidant 1010
Compatilizer PP-G
Embodiment 1
Using the screw combinations with two groups of mixing rotor elements to carry out extrusioning experiment, two groups of mixing rotors are respectively M160/40 and M160/40L, M160/28 and M160/28L, screw combinationsSuch as figure 4。
(1) weighing 780 parts of polypropylene, the compatilizer PP-G of 20 parts, the antioxidant 1010 of 4 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 38HZ, side feeding 30HZ, and electric current is 42A, and chopped glass fiber adds from side spout, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Comparative example 1 :
Using the mixing rotor element of a group of M160/40, M160/40L in screw stem combined structure, other structures are with screw stem combined structure used by embodiment 1.
(1) weighing 780 parts of polypropylene, the compatilizer PP-G of 20 parts, the antioxidant 1010 of 4 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 38HZ, side feeding 30HZ, and electric current is 45A, and chopped glass fiber adds from side spout, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Comparative example 2 :
Using the mixing rotor of one group of M160/28 M160/28L in screw stem combined structure, other structures are with screw stem combined structure used by embodiment 1.
(1) weighing 780 parts of polypropylene, the compatilizer PP-G of 20 parts, the antioxidant 1010 of 4 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 38HZ, side feeding 30HZ, electric current 48A, and chopped glass fiber adds from side spout, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Comparative example 3
Screw stem combined structure does not use mixing rotor element.
(1) weighing 780 parts of polypropylene, the compatilizer PP-G of 20 parts, the antioxidant 1010 of 4 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 38HZ, side feeding 30HZ, electric current 50A, and chopped glass fiber adds from side spout, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Performance is such asFollowing table 1
Table 1 embodiment 1 and comparative example 1 ~ 3 performance testTable 1
Test event Embodiment 1 Comparative example 1 Comparative example 2 Comparative example 3
Hot strength/MPa 85 80 74 70
Bending strength/MPa 118 113 105 88
Bending modulus/MPa 4200 4173 3970 3450
Simply supported beam notch shock/(KJ/m2) 12 10.8 9.7 8.1
Ash % 20.2 20.3 20.5 20
Extruder electric current 42 45 48 50
Note: tensile property carries out testing (draw speed is 50mm/min) according to ASTM D638；Bending property carries out testing (rate of bending is 1.25mm/min) according to ASTM D790；Simply supported beam notch shock performance is tested according to ASTM D6110, and ash is tested according to ASTM D2584.
Above example 1 and comparative example 1-3 can be seen that employing the screw combinations of mixing rotor element can significantly improve the mechanical property of polypropylene glass fiber material, and electric current is relatively low, illustrates that the energy consumption of extruder is low.
Embodiment 2
Use the screw combinations with two groups of mixing rotorsSuch as figure 4。
The material of embodiment 2 and comparative example 4 is as follows:
Polypropylene
Long fibre
Antioxidant 1010
Compatilizer PP-G
(1) weighing 670 parts of polypropylene, the compatilizer PP-G of 30 parts, the antioxidant 1010 of 4 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 40HZ, electric current 46A, and long fibre adds from glass fiber opening, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Comparative example 4
Do not use mixing rotor element.
(1) weighing 670 parts of polypropylene, the compatilizer PP-G of 30 parts, the antioxidant 1010 of 4 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 40HZ, electric current 50A, and long fine from glass fiber opening addition, processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Embodiment 3
Use the screw combinations with two groups of mixing rotorsSuch as figure 4。
The material of embodiment 3 is as follows:
Polypropylene
Pulvis Talci
Antioxidant 1010
Toughener POE 8150
(1) weighing 700 parts of polypropylene, the Pulvis Talci of 200 parts, the antioxidant 1010 of 4 parts, the toughener POE8150 of 100 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
(2) mixture that mix is added in meshing co rotating twin screw extrusion, through melted, vacuum exhaust, extrude, cool down, pelletizing prepares PP composite.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 40HZ, electric current 40A, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Comparative example 5
Do not use mixing rotor element.
(1) weighing 700 parts of polypropylene, the Pulvis Talci of 200 parts, the antioxidant 1010 of 4 parts, the toughener POE8150 of 100 parts put into high-speed mixer and mixing 2-4 minute, and high mixer rotating speed is 200 revs/min.
Wherein the type of meshing co rotating twin screw extrusion is: 40 machines, draw ratio: 40:1, engine speed 350 revs/min, vacuum-0.06MPa, main feeding 40HZ, electric current 45A, and processing temperature is as follows:
Warm area One district 2nd district 3rd district 4th district 5th district 6th district 7th district 8th district 9th district Head
Temperature/DEG C 170 200 205 210 200 200 200 205 210 210
Performance test is such asFollowing table 2。
Table 2 embodiment 2-3 and the performance test of comparative example 4-5Table 2
Test event Embodiment 2 Comparative example 4 Embodiment 3 Comparative example 5
Hot strength/MPa 82 66 22 17.3
Bending strength/MPa 105 96 32.8 26.8
Bending modulus/MPa 5800 5200 2078 1637
Simply supported beam notch shock/(KJ/m2) 9 6.3 47 31
Ash % 30.5 30.2 20.2 20.4
Extruder electric current 46 50 40 45
Note: tensile property carries out testing (draw speed is 50mm/min) according to ASTM D638；Bending property carries out testing (rate of bending is 1.25mm/min) according to ASTM D790；Simply supported beam notch shock performance is tested according to ASTM D6110, and ash is tested according to ASTM D2584.
Above example 2-3 and comparative example 4-3 can be seen that the screw combinations with mixing rotor element of the present invention can significantly improve the mechanical property of polypropylene material, screw combinations electric current with mixing rotor element is relatively low, illustrate that the energy consumption of extruder is low, production efficiency is high, can save manufacturing cost.

Claims (5)

1. for a mixing rotor element for double screw extruder, being made up of forward large pitch element and reverse large pitch element, described forward large pitch element uses specular to be connected with reverse large pitch element.
2. mixing rotor element as claimed in claim 1, it is characterised in that described forward large pitch element and the helical pitch of reverse large pitch element are 100-200mm, a length of 20-50mm.
3. it is provided with the screw combinations of mixing rotor element described in claim 1 or 2, including two parallel, homodromal screw rods, two described screw rods set transportation section and mixing section, and described transportation section is constituted by having threaded delivery element, and described mixing section is made up of mixing rotor element and kneading block.
4. screw combinations as claimed in claim 3, it is characterised in that mixing section is provided with at least two group mixing rotor elements.
5. as claimed in claim 3 screw combinations, it is characterised in that screw combinations by carrying screwing element, mixing rotor element, kneading block is alternately arranged constitutes.
CN201510341811.2A 2015-06-18 2015-06-18 Smelting rotor element for twin-screw extruder and screw combination Pending CN106313476A (en)

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201120716Y (en) * 2007-10-29 2008-09-24 浙江万马高分子材料股份有限公司 Double-screw extruder screw for PVC cable material production
CN202264380U (en) * 2011-09-21 2012-06-06 厦门集优新材料有限公司 Homonymous meshing extruding screw rod used for production of vinyl benzene thermoplastic elastomers
CN102700109A (en) * 2012-06-19 2012-10-03 苏州博云塑业有限公司 Screw for engaging double-screw extruder in same direction
CN102794899A (en) * 2012-07-27 2012-11-28 上海英科实业有限公司 Screw of twin-screw extruder for compound modification of waste rubber-plastic blending system
CN104072851A (en) * 2014-06-30 2014-10-01 江苏旭华圣洛迪建材有限公司 Raw material formula and preparation method of plastic alloy auxiliary frame of wood-plastic door and window

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201120716Y (en) * 2007-10-29 2008-09-24 浙江万马高分子材料股份有限公司 Double-screw extruder screw for PVC cable material production
CN202264380U (en) * 2011-09-21 2012-06-06 厦门集优新材料有限公司 Homonymous meshing extruding screw rod used for production of vinyl benzene thermoplastic elastomers
CN102700109A (en) * 2012-06-19 2012-10-03 苏州博云塑业有限公司 Screw for engaging double-screw extruder in same direction
CN102794899A (en) * 2012-07-27 2012-11-28 上海英科实业有限公司 Screw of twin-screw extruder for compound modification of waste rubber-plastic blending system
CN104072851A (en) * 2014-06-30 2014-10-01 江苏旭华圣洛迪建材有限公司 Raw material formula and preparation method of plastic alloy auxiliary frame of wood-plastic door and window

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