JP4094248B2 - Kneading and devolatilization extrusion equipment using supercritical fluid - Google Patents

Kneading and devolatilization extrusion equipment using supercritical fluid Download PDF

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JP4094248B2
JP4094248B2 JP2001163635A JP2001163635A JP4094248B2 JP 4094248 B2 JP4094248 B2 JP 4094248B2 JP 2001163635 A JP2001163635 A JP 2001163635A JP 2001163635 A JP2001163635 A JP 2001163635A JP 4094248 B2 JP4094248 B2 JP 4094248B2
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supercritical fluid
kneading
devolatilizing
vent port
upstream
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JP2002355880A (en
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秀樹 富山
光昭 山近
亨 江見
武 福島
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株式会社日本製鋼所
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/80Component parts, details or accessories; Auxiliary operations
    • B29B7/88Adding charges, i.e. additives
    • B29B7/94Liquid charges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/74Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7461Combinations of dissimilar mixers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/80Component parts, details or accessories; Auxiliary operations
    • B29B7/84Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/845Venting, degassing or removing evaporated components in devices with rotary stirrers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395Means 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
    • B29C48/40Means 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

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention melts and kneads a supercritical fluid and a molding material to obtain a molten molding material impregnated with the supercritical fluid, and gasifies the supercritical fluid in the molten molding material impregnated with the supercritical fluid. The present invention relates to a kneading and devolatilizing extrusion apparatus using a supercritical fluid that can be efficiently separated and removed to form a high-quality molded product.
[0002]
[Prior art]
Melt molding method using supercritical fluid as a molding method for molding materials that require severe molding conditions such as polymers with small differences between melting temperature and thermal decomposition temperature, heterogeneous polymer blends, mixed molding materials of polymer and filler, etc. Is attracting attention.
[0003]
Next, an example of a conventional melt molding method using a supercritical fluid will be described.
[0004]
This conventional melt forming method using a supercritical fluid is a meshing device having an atmospheric pressure side vent port after melting and kneading the supercritical carbon dioxide gas and polymer with a melting and kneading device such as an autoclave or screw extruder. Melting and kneading while suppressing shearing heat generation with a devolatilizing extruder such as a mold twin screw extruder, dissipating carbon dioxide gas from the atmospheric pressure side vent port, then extruding the strand from the die into water and cutting it into pellets (See JP-A-11-292981).
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional technology, for example, in the case of a mixed molding material of polymer and filler, carbon dioxide gas remains in the mixed molding material after carbon dioxide gas is diffused and removed from the atmospheric pressure vent port. It has been found that it causes deterioration of physical properties and generation of voids, and it has become necessary to forcibly devolatilize.
[0006]
However, the carbon dioxide gas in the supercritical state has a characteristic that the solubility in the polymer rapidly decreases when the gas changes from the supercritical state to the gas state due to a decrease in pressure. In the case of a mixed molding material of a polymer and a filler, In order to prevent re-aggregation, the following operation is required.
[0007]
(1) The pressure from the outlet of the melting / kneading device to the devolatilizing extruder must be maintained at 7.3 MPa or higher to maintain the supercritical state. It is desirable to provide a pressure adjusting nozzle and a pressure adjusting valve immediately before feeding the molten polymer to the resin to reduce the resin pressure in the devolatilizing extruder at once.
[0008]
(2) It is necessary to reduce the resin temperature from the outlet of the melting / kneading apparatus to the devolatilizing extruder as much as possible to suppress reaggregation of the filler.
[0009]
Therefore, if the above operations (1) and (2) are applied as they are, the carbon dioxide gas rapidly expands due to a sudden drop in pressure from the high pressure, the resin temperature decreases, and the carbon dioxide gas is removed from the molten polymer. There is a loss of plasticizing effect caused by separation and an increase in viscosity due to an increase in the freezing point. As a result, since carbon dioxide bubbles are included in the high-viscosity molten polymer, the volume is increased, the molten polymer feed capacity in the devolatilizing extruder is significantly reduced, and the feed capacity needs to be increased. Increasing the screw rotation speed of the devolatilizing extruder by increasing the screw rotation speed will increase the shearing force more than necessary to the molten polymer after devolatilization. There was a problem of causing deterioration of the filler and re-aggregation of the filler.
[0010]
The present invention has been made in view of the above-described problems of the prior art, and from a melt molding material impregnated with a supercritical fluid, the supercritical fluid is gasified while suppressing deterioration of the polymer and reaggregation of the filler. An object of the present invention is to realize a kneading and devolatilizing extrusion apparatus using a supercritical fluid that can be devolatilized reliably.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a kneading / devolatilizing extrusion molding apparatus using the supercritical fluid of the present invention includes a supercritical fluid melting / kneading apparatus for melting and kneading a supercritical fluid and a molding material, Volatile twin-screw extrusion for gasification, separation and removal of the supercritical fluid in the melt-molded material impregnated with the supercritical fluid discharged from the discharge line of the supercritical fluid melting and kneading device And a devolatilization biaxial extrusion molding machine comprising a cylinder and two screws rotatably disposed in the cylinder. And a supply port provided with pressure regulating means provided on the upstream side of the cylinder, and a die disposed on the downstream end of the cylinder, the cylinder connected to the discharge pipe The upstream side between the feed port and the die The downstream open vent port and at least one forced exhaust vent port are sequentially spaced from each other toward the downstream side, and the upstream open vent port is provided at the upstream portion of the supply port. In addition, each screw is provided with a crest portion in the vicinity of the upstream side of the forced exhaust vent port.
[0012]
In addition, each screw in the devolatilizing twin screw extruder is provided with a deep groove forward flight at a portion corresponding to the upstream open vent port.
[0013]
Furthermore, the cough part in the devolatilizing twin-screw extruder is composed of a reverse kneading disk or a seal ring.
[0014]
In addition, each screw in the devolatilizing twin-screw extruder is provided with a combination of forward flight and forward kneading disc at a portion corresponding to the downstream open vent port.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
First, an embodiment of a kneading / devolatilizing extrusion apparatus using a supercritical fluid will be described with reference to the drawings.
[0016]
As shown in FIG. 1, the kneading and devolatilization extrusion molding apparatus using the supercritical fluid according to the present embodiment is a melt molding material in which the supercritical fluid and the molding material are melted and kneaded and impregnated with the supercritical fluid. And a supercritical fluid melting / kneading device (not shown) and a melt molding material impregnated with the supercritical fluid supplied via the discharge pipe 25 of the supercritical fluid melting / kneading device. A devolatilizing twin-screw extruder E that can gasify a fluid to separate and remove it to form a high-quality molded product.
[0017]
Here, the supercritical fluid melting and kneading device melts and kneads the supercritical fluid and the molding material and discharges it while maintaining the supercritical fluid state from the discharge pipe as a molten molding material impregnated with the supercritical fluid. Any type is possible if it can be done.
[0018]
The devolatilizing twin-screw extrusion molding machine E has a cylinder 1 heated by a heating means (not shown) and two screws 2 rotatably disposed in the cylinder 1. A supply port 3 provided with pressure adjusting means 11 such as a pressure adjusting valve and a pressure adjusting nozzle is provided, and a die 4 is disposed at the downstream end of the cylinder 1.
[0019]
In the cylinder 1, the downstream open vent port 6a, the first forced exhaust vent port 7a, and the second forced exhaust vent port 7b are sequentially connected to each other from the supply port 3 side connected to the discharge pipe 25 toward the die 4 side. In addition to being provided at intervals, an upstream open vent port 6 b is provided on the upstream side of the supply port 3. The first forced exhaust vent port 7a and the second forced exhaust vent port 7b are connected to one end side of the suction conduit 8 via the branch conduits 9a and 9b, and the other end side of the suction conduit 8 is It is connected to vacuum generating means such as a vacuum pump 10. Each branch pipe 9a, 9b is provided with adjusting means 12a, 12b such as a flow rate adjusting valve and a flow rate adjusting nozzle in order to adjust the exhaust capacity of each forced exhaust vent port 7a, 7b.
[0020]
On the other hand, each screw 2 is provided with a first wetting portion 5a in the vicinity of the upstream side of the first forced exhaust vent port 7a, and in the vicinity of the upstream side of the second forced exhaust vent port 7b. A cough portion 5b is provided.
[0021]
Next, the operation of the kneading / devolatilizing extrusion apparatus using the supercritical fluid according to this embodiment will be described.
[0022]
A discharge pipe 25 is connected to the supply port 3 provided with the pressure adjusting means 11, and a melt molding material impregnated with the supercritical fluid is supplied through the discharge pipe 25. The melt molding material impregnated with the supercritical fluid in the discharge pipe 25 is kept at a high pressure (7.3 MPa or more in the case of carbon dioxide gas), and is suddenly reduced to a low pressure close to the atmospheric pressure by the pressure adjusting means 11. The pressure is lowered and introduced into the cylinder 1.
[0023]
When the melt molding material impregnated with the supercritical fluid passes through the pressure adjusting means 11 and is introduced into the cylinder 1, the supercritical fluid is gasified at once and foams to rapidly increase its volume. At that time, a part of the bubbles breaks up, is separated into the space in the cylinder 1, and a part thereof flows upstream in the cylinder 1 and is diffused into the atmosphere from the upstream open vent port 6 b, Most of them are transferred downstream while being contained in the melt molding material.
[0024]
The melt molding material transferred from the supply port 3 to the downstream side is gasified by being stretched by the surface renewal function by the rotation of the screw between the first weir part 5a (gas separation part A). Are broken and separated, and discharged from the downstream open vent port 6a between the supply port 3 and the first wetting portion 5a (gas separation portion A) to the outside of the apparatus. Along with this, the volume of the melt molding material is reduced, and the resin feeding capability in the devolatilizing twin-screw extrusion molding machine E is maintained in a high state. As a result, the first squeeze portion 5a can be passed without increasing the screw rotation speed, so that the melt molding material after devolatilization is not subjected to an excessive shear force and the temperature does not increase, and the polymer is deteriorated. And re-aggregation of the filler can be prevented.
[0025]
The molten molding material that has passed through the first weir 5a is a gasified supercritical fluid remaining from the first forced exhaust vent 7a between the first weir 5a and the second weir 5b (first decompression part B). Volatile components contained in the molding material are forcibly exhausted, and further gasified from the second forcible exhaust vent 7b between the second wetting part 5b and the die 4 (second decompression part C). Volatile components contained in the supercritical fluid and the molding material are forcibly evacuated and then extruded from the die 4.
[0026]
The number of forced exhaust vent ports is not limited to the two locations described above, and can be increased or decreased depending on the devolatilization situation. However, the L / D becomes longer as the number of forced exhaust vent ports is increased, and if it is increased more than necessary, resin deterioration and filler reaggregation are likely to occur.
[0027]
In the present invention, the devolatilizing twin screw extruder is preferably one having self-cleaning properties. And it is preferable to provide the forward flight of a deep groove in each screw | thread in a devolatilization biaxial extrusion molding machine in the site | part corresponding to a supply port upstream, ie, an upstream open | release vent port. On the other hand, the screw shape in the gas separation part A from which the gasified supercritical fluid is discharged from the downstream open vent port 6a is assumed to have a downstream feeding ability like a forward flight screw or a forward kneading disk. However, if possible, it is preferable to combine a forward flight screw having a high ability to thin the film by feeding and stretching and a kneading disk having a high surface renewal ability in order to maintain the feeding ability and avoid shear heat generation.
[0028]
In addition, as the cough portion, any seal ring, gate valve, rotary gate valve, reverse kneading disk, reverse flight disk, etc., can be used as long as the flow of the molten molding material is blocked and a sealing function is produced. A reverse kneading disk or a seal ring having a simple mechanism and low shearing force is preferable. In addition, when a kneading disk is used in the separation section, it is preferable to use a seal ring, a gate valve, or the like that is difficult to be sheared in order to suppress an increase in the resin temperature as much as possible.
[0029]
Further, the vacuum generating means for forced exhaust from the forced exhaust vent port is not limited to a vacuum pump, and other known means such as an aspirator or blower can be used as long as it can be adjusted to a pressure at which the melt molding material does not vent up. Can do.
[0030]
Next, a kneading / devolatilizing extrusion apparatus using a supercritical fluid according to another embodiment will be described.
[0031]
The kneading and devolatilizing extrusion apparatus using the supercritical fluid according to the present embodiment is a devolatilizing biaxial extruder E 1 as shown in FIG. 2, and is downstream of the open vent port 6a on the downstream side of the cylinder 1. In which a forced exhaust vent port 7 is provided at one location, and a discharge pipe 25 of a supercritical fluid melting and kneading apparatus E 2 is connected to the supply port 3 of the cylinder 1.
[0032]
The devolatilization twin-screw extruder E 1 is different from the devolatilization twin-screw extruder E shown in FIG. 1 described above in that the forced exhaust vent port 7 is provided at one place. The same reference numerals are given and description thereof is omitted.
[0033]
The supercritical fluid melting and kneading apparatus E 2 includes a twin-screw extruder 20 in which two screws 22 are rotatably disposed in a cylinder 21, and a gear pump 24 having a blowing side connected to the tip of the cylinder 21. A discharge pipe 25 having one end connected to the discharge side of the gear pump 24, and a transport section, a melting section, a kneading / mixing section, and a discharge section in order from the supply section side where the hopper 23 is provided to the gear pump side. I have.
[0034]
A kneading disk 22a is provided at a portion of each screw 22 corresponding to the kneading / mixing portion, and a backflow prevention means 26 such as a seal ring or a gate valve is disposed near the upstream side of the kneading disk 22a. It is installed.
[0035]
Further, a supercritical fluid inlet 27 is provided at a portion of the cylinder 21 corresponding to the kneading / mixing portion, and this supercritical fluid inlet 27 is supplied through a flow rate adjusting valve 31, a flow meter and the like. It is connected to the supercritical fluid generator 28 via a conduit 30.
[0036]
Here, as long as the supercritical fluid generator 28 can generate a supercritical fluid by setting the inert gas such as carbon dioxide gas and nitrogen gas stored in the cylinder 29 to a critical pressure and a critical temperature or higher, the supercritical fluid generator 28 can generate the supercritical fluid. Any type.
[0037]
Incidentally, in the case of carbon dioxide gas, it becomes a supercritical fluid at a critical temperature of 31.1 ° C. and a critical pressure of 7.38 MPa or more, and in the case of nitrogen gas, it becomes supercritical at a critical temperature of −147 ° C. and a critical pressure of 3.4 MPa or more. It becomes a critical fluid.
[0038]
Example 1
A kneading / devolatilizing extrusion molding apparatus using a supercritical fluid having the same configuration as that shown in FIG. 2 was used.
[0039]
A molding material in which 15% by weight of a master batch resin in which filler is mixed with 85% by weight of general-purpose polypropylene is mixed into a hopper of a twin screw extruder (manufactured by Nippon Steel Works, TEX30α, L / D42, pressure resistance specification) at 15 kg / After being introduced and melted at a rate of h, carbon dioxide gas (62 ° C., 9 MPa) in a supercritical state was injected from the supercritical fluid injection port so that the addition amount was 6% by weight and kneaded sufficiently. At this time, the resin pressure in the cylinder was 9 to 11 MPa, and the resin temperature before the gear pump was 170 ° C. to 180 ° C. The melt molding material impregnated with the supercritical fluid discharged from the gear pump into the discharge pipe is maintained in a supercritical state in the discharge pipe, the resin temperature before the pressure regulating valve is 165 ° C., and the resin pressure is 8 MPa. there were.
[0040]
It was confirmed that the melt molding material impregnated with the supercritical fluid reached a devolatilizing twin screw extruder (manufactured by Nippon Steel, TEX30α, L / D42, cough: reverse kneading disk 0.5D installed) After rotating the screw at 90 rpm and the molten molding material comes out stably from the die, the screw rotation speed is set to 74 rpm, and the vacuum pump (manufactured by Anlet Co., Ltd., dry method) is operated from the supply port. In order not to vent up, the pressure at the forced vent port (reduced pressure part) was gradually lowered to release devolatilization. At this time, the pressure gauge at the forced vent port (decompression part) indicated -98 Kpa (-760 mmHg).
[0041]
After 20 minutes, when the amount of gas exhausted from the open vent port was measured by the underwater substitution method, about 100 L / h of gas was detected from the upstream open vent port upstream of the supply port, and the downstream open vent downstream of the supply port. About 500 L / h of gas was released from the mouth. The resin temperature at this time was 181 ° C. at the die outlet.
[0042]
Similarly, Table 1 shows the results when supercritical carbon dioxide was injected so that the addition amount was 3% by weight.
[0043]
[Table 1]
[0044]
The MFR value of the raw material is the MFR value of the raw material (the abbreviation of Melt Flow Rate, which indicates the fluidity of the molten resin. The MFR of polypropylene is usually measured at 230 ° C. by applying a load of 2.16 kg). In the observation of the molded product using SEM (scanning electron microscope), no bubbles were found around or around the filler. From this, it was confirmed that the carbon dioxide in the resin was completely removed.
[0045]
(Comparative Example 1)
The same test as in Example 1 was performed except that the open vent port on the downstream side of the devolatilizing twin-screw extruder used in Example 1 was closed with a blind hardware.
[0046]
However, when a molten molding material impregnated with supercritical carbon dioxide gas is flowed, the resin bite downstream of the supply port in the devolatilizing twin screw extruder is poor, the resin pressure in the discharge pipe rises, and the pressure regulating valve Since the melt molding material started to leak from the connection part of the devolatilizing twin screw extruder, the screw rotation speed of the devolatilizing twin screw extruder was increased from 74 rpm to 111 rpm to ensure the transfer capability.
[0047]
In addition, when the amount of supercritical carbon dioxide added is 6% by weight, a plosive sound can be heard periodically from the downstream open vent, so the carbon dioxide that has lost its escape is intermittently vented upstream. It was inferred that the molten molding material moved toward the mouth, thereby making the transfer of the molten molding material unstable. Furthermore, the metal opening part of the vent port in the decompression part has been vented up, gradually closed by the melt molding material, and has to be periodically cleaned.
[0048]
Similarly, Table 2 shows the results when supercritical carbon dioxide gas is injected so that the addition amount is 3% by weight.
[0049]
[Table 2]
[0050]
From the MFR value and SEM observation of the molded product, it was confirmed that carbon dioxide gas was removed from the molded product, but the MFR value was 0.3 to 0.8 higher than the value of Example 1, and the molecular weight was When the distributions were compared, it was confirmed that the distribution was broad, indicating that the polymer had deteriorated.
[0051]
(Comparative Example 2)
A test similar to that of Example 1 was performed except that the upstream open vent port of the devolatilizing twin-screw extruder used in Example 1 was closed with a blind hardware.
[0052]
When a molten molding material impregnated with supercritical carbon dioxide was flowed, although not as in Comparative Example 1, the bite of the resin on the downstream side of the supply port in the devolatilizing twin screw extruder was poor.
[0053]
However, since the resin pressure in the discharge pipe began to rise, the screw rotation speed of the devolatilizing twin screw extruder was increased from 74 rpm to 89 rpm to ensure the transfer capability.
[0054]
In addition, when the amount of supercritical carbon dioxide added is 6% by weight, a plosive sound is periodically heard from the downstream open vent port, and the molten molding material begins to vent up little by little. The screw rotation speed of the molding machine was increased to 111 rpm to avoid vent-up.
[0055]
Similarly, Table 3 shows the results when supercritical carbon dioxide is injected so that the addition amount is 3% by weight.
[0056]
[Table 3]
[0057]
【The invention's effect】
Since this invention is comprised as mentioned above, there exists an effect as described below.
[0058]
From the melt molding material impregnated with the supercritical fluid, it is possible to completely devolatilize the supercritical fluid and volatile components that are efficiently gasified while suppressing the degradation of the polymer. It is possible to produce a high quality molded product without happening.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a devolatilizing twin-screw extruder according to an embodiment.
FIG. 2 is an explanatory diagram of a kneading and mixing extrusion molding apparatus using a supercritical fluid using a devolatilizing twin-screw extruder according to another embodiment.
[Explanation of symbols]
1, 21 Cylinder 2, 22 Screw 3 Supply port 4 Die 5 Cough part 5a First cough part 5b Second cough part 6a Downstream side open vent port 6b Upstream side open vent port 7 Forced exhaust vent port 7a First compulsory exhaust vent port 7b Second forced exhaust vent port 8 Suction pipes 9a, 9b Branch pipe 10 Vacuum pump 11 Pressure adjusting means 12a, 12b Adjusting means 20 Twin screw extruder 23 Hopper 24 Gear pump 25 Discharge pipe 26 Backflow prevention means 27 Supercritical Fluid inlet 28 Supercritical fluid generator 29 Cylinder 30 Supply line 31 Flow rate adjusting valve 32 Flow meter

Claims (4)

  1. A supercritical fluid melting and kneading device (E 2 ) for melting and kneading the supercritical fluid and the molding material, and a supercritical fluid discharged from the discharge pipe (25) of the supercritical fluid melting and kneading device Kneading using a supercritical fluid equipped with a devolatilizing twin-screw extruder (E, E 1 ) for gasification, separation and removal of the supercritical fluid in the melt-molded material impregnated with fluid, and extrusion A devolatilization extrusion device,
    The devolatilizing twin screw extruder includes a cylinder (1), two screws (2) rotatably disposed in the cylinder, and pressure adjusting means (11) provided on the upstream side of the cylinder. ) And a die (4) disposed at the downstream end of the cylinder,
    The cylinder has a downstream open vent port (6a) and at least one forced exhaust vent port (in order) from the upstream side to the downstream side between the supply port connected to the discharge pipe and the die. 7, 7 a, 7 b) are provided at a distance from each other, and an upstream open vent port (6 b) is provided at an upstream portion of the supply port,
    A kneading / devolatilizing extrusion molding apparatus using a supercritical fluid, wherein each screw is provided with a chamfer (5, 5a, 5b) in a vicinity of the upstream side of the forced exhaust vent port. .
  2. Devolatilization twin-screw extruder (E, E 1) to the screw (2) in the claims a portion corresponding to the upstream side open vent port (6b), characterized in that a forward flight of the deep groove A kneading / devolatilizing extrusion apparatus using the supercritical fluid according to 1.
  3. Devolatilization twin-screw extruder (E, E 1) weir section in (5, 5a, 5b) is a supercritical fluid according to claim 1 or 2, characterized in that the reverse kneading disk or seal ring Used kneading and devolatilizing extrusion equipment.
  4. Each screw (2) in the devolatilizing twin-screw extruder (E, E 1 ) is provided with a combination of forward flight and forward kneading disk at the site corresponding to the downstream open vent port (6a). A kneading and devolatilizing extrusion apparatus using the supercritical fluid according to any one of claims 1 to 3.
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JP3914961B2 (en) * 2005-08-18 2007-05-16 日立マクセル株式会社 Method for manufacturing molded product, extrusion molding apparatus and molded product
JP4790517B2 (en) * 2006-07-12 2011-10-12 株式会社日本製鋼所 Method for producing thermoplastic resin composition
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