JPH10180841A - Side feed extruder of powder and extrusion method using the extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity of pellet-like resin by uniformizing dispersion of powdery reinforcing agent into the resin by a method wherein a screw lead length of a screw element from a part connected directly to a side feeder to a first kneading zone, and a screw structure of monomer kneading zone are specified. SOLUTION: In a regular sequence order screw from a side feeder 6 between a first kneading zone and a second kneading zone to the second kneading zone, a screw lead length L/D is 0.8-2.0. A screw structure of the second kneading zone is a combination wherein one set or over of a kneading disk A and a mixing screw or a kneading disk B are repeated from an upper stream side. A ratio La/D of a vane thickness La and a screw diameter D of the kneading disk A is 0.05-2.0, and twist angle β of the vane is 25-75 degree. A mixing screw flight part contained in the B is notched 5-15 positions per each one lead length, its La/D is 0.05-2.0, and its β is 80-110 degree.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to an extruder suitable for side-feeding a powdery reinforcing agent and highly dispersing the powdery reinforcing agent, and using the extruder to highly disperse the powdery reinforcing agent. Extrusion method.

[0002]

2. Description of the Related Art In general, a resin composite material is mixed with a powdery reinforcing agent in a resin by an extruder, granulated, and then subjected to product production by a molding machine. The extruder for producing this composite material feeds the resin from the main hopper, melts the resin in the first kneading zone, throws in the powdery reinforcing agent from the side feeder, and melts the reinforcing agent in the second kneading zone. Mixed with the resin.

[0003] By the way, when a powdery reinforcing agent is side-fed, it has a characteristic that biting into a screw of an extruder is worse than that of a pellet-like resin or glass fiber. The smaller the average particle size of the powdery reinforcing agent, the worse the bite into the screw of the extruder, and the lower the productivity of the granulated material. Although the extrusion technique of such a powdery reinforcing agent is an important technique in the molding process, there are few published techniques so far.

[0004] By the way, although it is slightly different from the technique of extruding a powdery reinforcing agent, the technique of extruding a powdery resin is as follows.
The following are known.

(1) According to the technical data of the German company Warner & Friedler, when extruding a powdery resin, the screw configuration of the first kneading zone of the extruder is determined by the kneading disk (A) of the present invention. It is disclosed that only those that fall into the category are included.

(2) "Molding Symposia, 94 C2"
No. 11 ", the first kneading zone is obtained by variously combining a reverse feed screw with a kneading disk (B) in the present invention or a kneading disk (A) in the present invention. The results of examining the plasticizing behavior of the polypropylene powder in the plasticizing zone by changing the screw configuration of No. 3 are disclosed.

[0007] (3) For "Molding process, 96.B212", it is disclosed that 100% of polypropylene powder is used and extruded using a needing disk falling under the category of (A) and (B) in the present invention. Have been.

[0008]

However, in the case of the screw configuration of the above (1), the resin pressure does not increase in the kneading zone, so that the productivity is improved, but the kneading force tends to be insufficient, so that the There is a problem that it is difficult to uniformly disperse the reinforcing agent.

The technique (2) is for studying the behavior of the plasticized state in the plasticizing zone, and does not disclose improving the productivity. In addition, it is premised that a reverse feed screw is disposed in any of the studied screw configurations. However, according to the knowledge of the present inventor, good productivity cannot be obtained with such a screw configuration. .

In the technique (3), five (A) and one (1)
(B) are combined from the upstream side. Using this technology, side-feeding and kneading the powdered reinforcing agent reduces the dispersion of the powdered reinforcing agent and vents up due to the resin temperature drop due to the contact between the powdered reinforcing agent and the molten resin. Or

The present invention is intended to improve the productivity of pelletized resin and the like, which is obtained by extruding the powdery reinforcing agent uniformly in the resin, especially when the powdery reinforcing agent is side-fed. Aim.

[0012]

According to the present invention, there is provided:
A screw lead length of a screw element from a portion directly connected to a side feeder to a first kneading zone from a center of a joint portion between the side feeder and the twin screw extruder to a downstream side in a twin-screw extruder provided with a side feeder. The L / D is 0.8 to 2.0, and the screw configuration from the side feeder to the first kneading zone is composed of a combination of repeating at least one of the following (A) and (B) from the upstream side, and (A) ) Are located at the uppermost stream and the lowermost stream.

(A) A needing disk having a blade thickness La / D of 0.05 to 2.0 per sheet and a twist angle β of 25 to 75 degrees.

(B) The thickness La / D of the mixing screw or the blade per piece in which the screw flight portion is cut out at 5 to 15 places in one lead is 0.05 to 2.0, and the twist angle β is 80-110 degree needing disc.

[0015] The present invention also provides an extrusion method suitable for extruding a resin to which a powdery reinforcing agent has been added using the extruder for powder side feeding.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An extruder 1 for side-feeding a powder according to the present invention is as schematically shown in FIG.
Among them, 2 is a main hopper, 4 is a vent port, 5 is a liquid addition nozzle, 6 is a side feeder, 7 is a liquid addition tank, 8 is a liquid addition nozzle, and 9 and 10 are feeders.

The extruder 1 for side-feeding the powder is a twin-screw extruder so that a sufficient conveying force for the powder side-feed can be obtained. , Generally of the same direction.

The extruder 1 for side-feeding the present powder is generally used to obtain a pellet-shaped resin, but the present invention is not limited to this, and can be used to form a sheet or film. There may be. For example, the side feed of the powder of the present invention is improved by improving the screw configuration in the first kneading zone such as ZSK series manufactured by Warner & Friedler, TEM series manufactured by Toshiba Machine Co., Ltd., and TEX series manufactured by Nippon Steel Corporation. Extruder can be obtained.

The length of the extruder 1 for side-feeding the powder is L / D (L = length, D = screw diameter) of 10
It is preferable that the length is ６０60. L / D is 10
If it is less than 50%, degassing and side feeding are difficult to perform, and if the L / D of the side-feeding extruder 1 for the present powder exceeds 60, the residence time of the resin is prolonged and the resin is likely to deteriorate. In the present specification, L and D generally represent length and diameter, and for example, the disc length L / D is obtained when L is the disc length of the neading disc and D is the screw diameter of the neading disc. L / D is meant.

In the present invention, the screw configuration of the first kneading zone (the second kneading zone in FIG. 2) is particularly significant downstream of the side feeder 6. The resin supplied from the main hopper 2 shown in FIG. 1 is first heated and kneaded in the first kneading zone, and is melted. In the second kneading zone, the powdery reinforcing agent supplied from the side feeder 6 is dispersed and mixed in the molten resin. Second
The position of the kneading zone depends on the length of the extruder 1 for side-feeding the present powder, but the length of the extruder for side-feeding the present powder from the center position of the barrel provided with the main hopper 2. It is preferable that L / D is in the range of 14 to 50.

The kneading zone, which is the most characteristic part of the present invention, is not always the second kneading zone as shown in FIG. Since the powder is placed immediately downstream after the side feed, the kneading zone located at the first downstream side from the side feeder 6 may be used. When the powder is side-fed from two places, the number of kneading zones, which is the most characteristic part in the present invention, is two. Further, in the present invention, the powder can be separately supplied from the main hopper and the side feeder.

Hereinafter, the kneading zone located first on the downstream side from the side feeder 6 will be described with reference to FIG.
This will be described as a kneading zone.

The screw configuration of the second kneading zone in the present invention comprises a combination of a kneading disk (A) and a mixing screw or a needing disk (B), which will be described later, repeated at least one set from the upstream side. A) is located at the uppermost stream and the lowermost stream. If this condition is satisfied, the order of the combination is not particularly limited.

The kneading disk (A) used in the present invention is one of those shown in FIG. 3 and is the ratio of the thickness La of the blade 3 per sheet to the screw diameter (La / D).
Is in the range of 0.05 to 2.0. The preferred range of the width La / D of the blade 3 per sheet is 0.07 to
1.5. Further, the twist angle β of the blade 3 is 25 to 7
It must be in the range of 5 degrees. Preferred β is 30
Degrees, 45 degrees or 60 degrees.

(B) used in the present invention is a mixing screw or a needing disk, and the needing disk included in (B) is also one of those shown in FIG. Has a width La / D of 0.
It is necessary to be in the range of 05 to 2.0. A preferred range of the blade width La / D per sheet is 0.07 to 1.5.
It is. Further, it is necessary that the twist angle β of the blade 3 is in the range of 80 to 110 degrees. The preferred β is 90 degrees.

The mixing screw included in (B) is:
As shown in FIG. 4, the screw flight portion is a mixing screw with 5 to 15 cutouts per lead length. Here, one lead is the screw length when the screw makes one rotation. If the number of cutouts is less than 5, the mixing power is insufficient, and if it exceeds 15, it is difficult to obtain sufficient mechanical strength. The ratio L / D of the screw lead length L to the screw diameter D is preferably in the range of 0.20 to 1.
L / D is too short, so that the bite of the powder tends to decrease,
If this is too large, the mixing power is reduced, and the dispersion of the powder is likely to be reduced.

The screw parts (B) other than those described above include a reverse screw mixing screw, a turbine mixing screw, a 0 degree needle disk, and the like.

The length of the screw component of the combination of the above (A) and (B) in the second kneading zone is in the range where the total length L / D of the screw component is 1.5 to 12. Is preferred. If this is too small, mixing of the powdery reinforcing agent tends to be insufficient, and venting tends to occur. On the other hand, if it is too large, the biteability of the powder decreases.

Downstream of the second kneading zone, third, fourth and fourth
The same kneading zone can be provided as in the ordinary extruder. In particular, when the liquid addition nozzle 5 and the side feeder 6 described below are provided, it is usual that a kneading zone is provided on the downstream side as in the conventional case. In the third and subsequent kneading zones, a reverse screw, a kneading light, a kneading disk (kneading left) having a twist angle of 100 to 170 degrees of the blade 3, a wide,
The kneading disk (A), the screw parts, the seal ring, and the like (B) can be arbitrarily selected and used. However, when the further provided side feeder 6 supplies a powdery reinforcing agent, the screw configuration of the kneading zone immediately downstream of the side feeder 6 has the same combination of (A) and (B) as described above. This is the screw configuration.

In the case of FIG. 2, the side feeder 6
It is located between the kneading zone and the second kneading zone. The progressive screw between the side feeder 6 and the second kneading zone has a screw lead length L / D of 0.8 to
It needs to be 2.0. If it is less than 0.8, the bite of the powder is reduced, and if it is more than 2.0, the filling rate is reduced and the self-cleaning property is reduced. Preferred L /
D is 0.9 to 1.5.

Furthermore, an extruder 1 for side-feeding the present powder
As in the case of a general extruder, a vent port 4, a liquid addition nozzle 5, and / or a further side feeder 6 can be provided downstream of the second kneading zone.

The vent port 4 is preferably provided before and after the combined screw area of (A) and (B). Without the vent port 4, the powdered reinforcing agent to be side-fed easily blows out from the side feeder 6 or the like. Two or more vent ports 4 may be provided before and after the combined screw area of (A) and (B), respectively, and the direction may be upward or sideways, and may be either atmospheric vent or vacuum vent. When adding liquid,
Heating can be performed according to the viscosity of the liquid to be added. As the liquid supply pump 8 for supplying the liquid from the liquid supply tank 7, either a plunger pump or a gear pump may be used. Further, the feeders 9 and 10 may be either of a capacity type or a weight type, but generally a weight type is preferred.

The extruder 1 for side-feeding the present powder is particularly effective for side-feeding a powdery reinforcing agent having an average particle size of 0.01 to 500 μm. The average particle diameter is JIS Z88 when the particle diameter is large (50 μm or more).
According to 01, in the case of a fine particle size (less than 50 μm), it is a value measured by a Coal counter measuring instrument.

The powdery reinforcing agent includes heavy calcium carbonate (average particle size 0.7 to 8 μm), colloidal calcium carbonate (average particle size 0.03 to 0.15 μm), and soft calcium carbonate (average particle size 1 0.5-2 μm), silica, kaolin (average particle size 0.8-2.3 μm) clay (average particle size 1.4-1)
2 μm), titanium oxide (average particle size 0.15 to 0.3 μm)
m), barium sulfate, zinc oxide, alumina, magnesium hydroxide, talc, mica (average particle size 10 μm), glass flake, hydrotalcite, needle-like filler (wollastonite, potassium titanate, basic magnesium sulfate, seprite) , Zonotolite, aluminum borate), glass beads, silica beads, alumina beads,
Carbon beads, glass balloons, metallic conductive fillers, non-metallic conductive fillers, carbon, magnetic fillers, piezoelectric / pyroelectric fillers, slidable fillers, fillers for sealing materials, ultraviolet absorbing fillers, fillers for vibration damping, etc. It is. However, the average fiber diameter of the acicular filler is defined as the average particle diameter.

When the resin containing the powdery reinforcing agent as described above is melted, kneaded and extruded by the extruder 1 for side-feeding the present powder, other additional components can be added. For example, antioxidants, weather resistance improvers, nucleating agents for polyolefins, slip agents, various coloring agents, antistatic agents, release agents, monomer components (maleic anhydride, styrene, acrylic acid, etc.), peroxides (perhexyne) 25B, perbutyl D, perhexin 25B, etc.) can be used alone or in combination of two or more. These may be fed from the side feeder 6 together with the powdery reinforcing agent or the main hopper 1
You may put in from. Further, one or more of fibers such as glass fiber, carbon fiber, Kepler fiber, stainless steel fiber, and copper fiber may be side-fed.

In the extruder for side-feeding the present powder having the liquid addition nozzle 5, examples of the liquid supplied from the liquid addition nozzle 5 include mineral oil, phosphate ester, and silicone oil. Mineral oils include, for example, paraffinic, naphthenic, and aromatic oils, and phosphate esters include, for example, triphenyl phosphate and 2,2-bis- ビ ス 4- (bis (methylphenoxine) phosphoryloxy) phenylシ リ コ ン Silicon oils such as propane and phosphoric acid- (3-hydroxyphenyl) diphenyl are, for example, dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, etc., and one or more kinds thereof can be used at the same time. . The feeder to be fed may be either a capacity type or a weight type, but a weight type is preferred.

The combination of the side feed materials is resin,
One or two selected from filler and fiber
More than a species. In addition, a kneading zone is required to mix the side feed material and the main feed resin, and the combination of the needing disk may be arbitrarily selected from among a needing light, a neutral, a needing left, a reverse screw, and the like.

As the liquid pump, either a plunger pump or a gear pump may be used. The liquid may be heated according to the viscosity of the liquid.

The degassing barrel used in the present invention is a barrel having a degassing hole in the barrel, and the position of the hole may be either upward or lateral. Vent port to release gas
Either atmospheric vent or vacuum vent may be used. The number of vent ports is preferably two or more.

[0040]

EXAMPLES First, evaluation criteria in Examples and Comparative Examples,
Extrusion conditions and screw parts used will be described.

(1) Evaluation Criteria for Dispersion State of Powdered Reinforcement Extruded pellets were pressed at a temperature of 280 using a press molding machine.
Pressed at 50 ° C and 50 kg / cm ² for 10 minutes to obtain a thickness of 1
A sheet having a thickness of 10 mm was formed using a vacuum forming machine adjusted to a temperature of 280 ° C., and the dispersion state of the powdery reinforcing agent in the obtained sheet was visually determined with an optical microscope. The evaluation criteria are as follows.

…: Maximum particle diameter of 10 μm or less ○: Maximum particle diameter of 50 μm or less Δ: Maximum particle diameter of 100 μm or less ×: Maximum particle diameter of 100 μm or more

(2) Extruder As an extruder, a twin-screw co-extruder (ZSK-4 manufactured by Warner & Friedler Co., Ltd.) as shown in FIG. 8 was used.
0 ", L / D = 46, 11 barrels), and the experiment was conducted mainly by variously changing the screw configuration of the second kneading zone. All feeders used were weight feeders (K-Tron feeders) to minimize torque fluctuations. In addition, the extrusion amount referred to in the examples and comparative examples is the extrusion amount when the feed amount is maximized.

Barrel temperatures were measured using the No. 1
At 50 ° C. 280 ° C for 2-11 barrels
And Screw rotation speed is 295 rpm unless otherwise noted.
m. The screw configuration of the first kneading zone is such that KR60 × 1, KR40 × 1, KR20 × 1, K
N40 × 1 and KL20 × 1.

(3) Screw Parts The types of the needing screw and progressive screw used in the examples and comparative examples are as shown in Tables 1 and 2 below. Table 1 shows a needing disk, and Table 2
Indicates a progressive screw including a mixing screw.

[0046]

[Table 1]

[0047]

[Table 2]

Example 1 Nylon 66 (Ny66: "Lona 12" manufactured by Asahi Kasei Corporation)
00S ", Tm = 265 ° C) at 60 kg / h, and the powdered reinforcing agent was side-fed at 40 kg / h, mixed and extruded. Heavy calcium carbonate having an average particle size of 1.8 μm was used as the powdery reinforcing agent.

The screw configuration of the second kneading zone is KR2
0, KN40 and KR20. No. The open vents of barrels 5 and 10 were opened to make them atmospheric vents.

A stable operation was possible at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
~.

Example 2 The screw composition of the second kneading zone was KR20, KN40,
KR20, KN40 and KR20. No. 5 and 1
The open vent of barrel 0 was opened to be an atmospheric vent.

A stable operation was possible at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Comparative Example 1 Under the same conditions as in Example 1, the screw configuration of the second kneading zone was KR40, KR40, KL20, KL20.

The powdery reinforcing agent was No. No. 5 was blown out from the open vent of the barrel, and operation was impossible at a predetermined extrusion rate.

Comparative Example 2 Under the same conditions as in Example 1, the screw configuration of the second kneading zone was KR40, KR40, KR40 and KR20.

The powdery reinforcing agent did not blow out from the open vent of any barrel, and the total output was 100 k.
g / h, but the evaluation of the dispersibility of the powdery reinforcing agent was as follows:
Met.

Comparative Example 3 Under the same conditions as in Example 1, the screw configuration of the second kneading zone was KR40, KR20, KN40 and KL20.

When the powdery reinforcing agent is No. No. 5 was blown out from the open vent of the barrel, and operation was impossible at a predetermined extrusion rate.

Comparative Example 4 Under the same conditions as in Example 1, the screw configuration of the second kneading zone was KR40, KR40, KR20 and KN40.

The powdered reinforcing agent did not blow out from the open vent of any barrel, and the total output was 100 k.
g / h, but the evaluation of the dispersibility of the powdery reinforcing agent was as follows:
Met.

Comparative Example 5 Under the same conditions as in Example 1, all the screw elements on the upstream side of the second kneading zone were changed to SC25.

When the powdery reinforcing agent is No. No. 5 was blown out from the open vent of the barrel, and operation was impossible at a predetermined extrusion rate.

Example 3 Under the same conditions as in Example 1, the screws in the second kneading zone were changed to KR40, KN40, KR40, KN40 and KR4.
0 was set.

A stable operation was possible at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Example 4 Under the same conditions as in Example 1, the screw configuration of the second kneading zone was changed to KR40, KR20, KN40, KR20, KN4.
0 and KR20.

A stable operation was possible at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Example 5 Under the same conditions as in Example 1, the screw configuration of the second kneading zone was KR20, MC, KR20, MC, KR20.

A stable operation was possible at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Example 6 Under the same conditions as in Example 1, the main feed resin was polystyrene (PS: “Polystyrene 47” manufactured by Asahi Kasei Corporation).
3 "). The barrel temperature was 230 ° C. The barrel temperature was 230 ° C.

A stable operation was possible for 3 hours at a total extrusion rate of 100 kg / h. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Example 7 Under the same conditions as in Example 1, the main feed resin was polycarbonate (PC: “Panlite L” manufactured by Teijin Chemicals Ltd.)
1225 ").

A stable operation could be performed at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Example 8 Under the same conditions as in Example 1, the main feed resin was polypropylene (PP: “Polypropylene M-1600” manufactured by Asahi Kasei Corporation). The barrel temperature was no. 2-1
One barrel was at 230 ° C.

A stable operation could be performed at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

Example 9 Under the same conditions as in Example 1, the main feed resin was a polymer alloy of polyphenylene ether and polystyrene ("Zylon 300H" manufactured by Asahi Kasei Kogyo Co., Ltd.). The barrel temperature was no. Barrels 2-11 were at 260 ° C.

A stable operation could be performed at a total extrusion rate of 100 kg / h for 3 hours. The powdered reinforcing agent did not blow out from any of the barrel open vents, and could be stably mixed and extruded. The evaluation of the dispersibility of the powdery reinforcing agent was ◎
Met.

[0077]

[Table 3]

[0078]

The present invention is as described above. In the extrusion treatment of a powdery reinforcing agent, the extrusion efficiency is improved without causing trouble such as vent-up, and the extrusion is performed through this extrusion. It can improve the productivity of pellet-shaped resin and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an extruder for powder side feed according to the present invention.

FIG. 2 is an explanatory diagram of an extruder used in Examples and Comparative Examples.

FIG. 3 is an explanatory diagram of a needing disk.

FIG. 4 is an explanatory view of a mixing screw.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder for powder side feed 2 Main hopper 3 Blade 4 Vent port 5 Liquid addition nozzle 6 Side feeder 7 Liquid addition tank 8 Liquid addition pump 9,10 Feeder

Claims (4)

[Claims] 1. A twin-screw extruder provided with a side feeder, wherein a screw from a portion directly connected to the side feeder to a first kneading zone from a center of a joint portion between the side feeder and the twin-screw extruder toward a downstream side. Screw lead length L / D of the element is 0.8 to 2.0, and the screw configuration from the side feeder to the first kneading zone is a combination of one or more of the following (A) and (B) repeated from the upstream side. And (A) is located at the uppermost stream and the lowermost stream. (A) The blade thickness La / D per sheet is 0.05 to 2.
A needing disk with a twist angle β of 25 to 75 degrees at 0. (B) The thickness La / D of the mixing screw or the blade per piece in which the screw flight portion is cut out at 5 to 15 places in one lead is 0.05 to 2.0, and the twist angle β is 8
Needing disk of 0-110 degrees. 2. The extruder according to claim 1, wherein the screw length L / D of the entire screw configuration of (A) and (B) is 1.5 to 12. 3. A side feed powder according to claim 1, wherein one or more degassing barrels are provided both before and after the screw configuration of (A) and (B). Extruder. 4. A powdery reinforcing agent having an average particle size of 0.01 to 500 μm is supplied from a main hopper through a side feed supply port of the powder side extruder according to any one of claims 1 to 3. 20 to 10 based on 100 parts by weight of resin
0 parts by weight, and the barrel temperature is from the melting point of the resin supplied from the main hopper to 350 ° C. or the glass transition temperature +
An extrusion method characterized by extruding at a temperature in the range of 30 ° C to 350 ° C.