JPH08244026A - Twin-screw neader - Google Patents

Abstract

PURPOSE: To provide a twin-screw kneader capable of supplying a fine powder material in a desired compounding ratio without whirling up the fine powder material within a feed hopper while extracting gas from a material supply port. CONSTITUTION: A fine powder material supply pipe 12 is provided in a feed hopper 2 so as to extend to a material supply port 6 and the opening end thereof is provided so as to be positioned between two screws 8, 9 in the vicinity of the material supply port 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-screw kneader, and more particularly to a twin-screw kneader for kneading by adding a fine powder material such as fine powder talc to a raw material resin.

[0002]

2. Description of the Related Art FIG. 3 illustrates a continuous twin-screw kneader. This twin-screw kneader has a material supply port 21 and a material discharge port (not shown) after kneading. A twin-screw kneading machine main body 25 in which screw shafts 23 and 24 rotating in different directions are arranged in parallel in a cylinder 22, a feed hopper 26 connected to the material supply port 21, and an upper lid 27 of the feed hopper 26. A material supply pipe 29 connected to a constant amount material supply device 28 and a vent pipe 30 for degassing are provided. Then, the material to be kneaded is fed into the hopper 31 of the constant amount supply device 28, cut out in a constant amount by the constant amount supply device 28, and fed through the material supply pipe 29 to the feed hopper.
It is supplied to the material supply port 21 of the twin-screw kneader body 25 from the feed hopper 26. The fixed quantity supply device 28 and the material supply pipe 29 may be one or several depending on the material to be supplied.

[0003]

By the way, in supplying the material in the above-mentioned twin-screw kneader, for example, in addition to the raw material resin, fine powder material such as fine powder talc (fine particle diameter 10 μm)
The following) in a high ratio from the constant quantity feeder 28 to the twin-screw kneader body 25
When supplied to, the raw material resin and fine powder material are kneaded and melted while being heated by a heater (not shown).
Since gas, steam, etc. generated at that time blows up from the material supply port 21 into the feed hopper 26, a fine fine powder material having a low specific gravity rises up in the feed hopper 26, and the supply of the fine powder material is obstructed and the resin material after kneading Has led to a decline in production. In particular, recently, there are many grades in which the mixing ratio of the raw material resin and the fine powder material is large, such as 4: 6, 3: 7, 2: 8, etc., and the mixing ratio of the fine powder material is large. As a matter of fact, there is a tendency that the production amount is significantly reduced due to the supply failure. As is well known, it is necessary to vent gas from the material supply port 21, and if the gas does not escape, the internal pressure in the cylinder 22 becomes high, resulting in obstructing the supply of all the materials.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to remove a gas or the like from a material supply port without raising a fine powder material in a feed hopper. The present invention provides a twin-screw kneading machine capable of supplying a fine powder material having a compounding ratio of.

[0005]

In order to achieve the above object, in a twin-screw kneader according to claim 1 of the present invention, a feed pipe for feeding a fine powder material is provided in a feed hopper provided at a material feed port. Is provided so as to be extended to, and its open end is provided so as to be located between the biaxial screws in the vicinity of the material supply port.

The twin-screw kneader according to a second aspect of the present invention is a twin-screw kneader in which a raw material resin supply pipe and a fine powder material supply pipe are provided above a feed hopper provided at a material supply port. In the kneading machine, a supply pipe for supplying the fine powder material is provided so as to extend in a feed hopper provided at the material supply port, and its opening end is positioned between the biaxial screws near the material supply port. It is provided by. In this case, the supply pipe for the raw material resin and the supply pipe for the fine powder material may be integrally formed and extended in the feed hopper.

[0007]

In the above structure, at least the supply pipe for supplying the fine powder material is provided so as to extend in the feed hopper provided at the material supply port, and the open end of the supply pipe is located near the material supply port. The fine powder material supplied into the feed hopper is directly supplied to the material supply port since it is provided so as to be located between them, and on the other hand, between the outer periphery of the opening end of the supply pipe and the inner periphery of the material supply port. Since the gas and the like generated by kneading escapes through the space, the rise of the fine powder material due to the gas and the like passing through the material supply port is greatly suppressed, and the fine powder material can be supplied at a desired mixing ratio,
It is possible to improve productivity by kneading,
Stable operation of the twin-screw kneader is possible.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is an explanatory view of a twin-screw kneading machine according to the present invention, in which a is an enlarged sectional view of an essential part, and b is an XX sectional view of a. In the figure, 1 is a twin-screw kneader main body, 2 is a feed hopper, 3 is a first fixed amount supply device, 4 is a second fixed amount supply device, and 5 is a vent pipe.

The twin-screw kneader body 1 has a cylinder 7 having a material supply port 6 and a discharge port (not shown) for the material after kneading.
Screw shafts 8, which rotate in different directions (inward to each other),
9 are arranged in parallel, and the materials supplied from the material supply port 6 are kneaded while being fed forward by the screw teeth which mesh with each other. In this case, the screw shafts 8 and 9 may be a combination type of screw teeth and a kneading blade at the tip thereof.

The feed hopper 2 is connected to the material supply port 6, and a vent pipe 5 is provided on an upper lid 10 of the feed hopper 2 so that gas and the like generated by the kneading escapes. Further, a supply pipe 11 of the first fixed amount supply device 3 is opened and connected to the feed hopper 2 on the upper lid 10, and a supply pipe 12 of the second fixed amount supply device 4 is inserted and provided at the tip thereof. , Near the material supply port 6 (the tip of the supply pipe 12 and the screw shafts 8 and 9)
10 mm to 250 mm apart from the upper surface of the screw shafts 8 and 9 are located between shaft center lines 8a and 9a of the screw shafts 8 and 9.

Since the twin-screw kneading machine according to the present invention is constructed as described above, while the pelletized resin raw material is fed into the feed hopper 2 through the feed pipe 11 from the first fixed amount feeding device 3, Fine powder material such as fine talc can be supplied from the second fixed amount supply device 4 to the material supply port 6 in the feed hopper 2 through the supply pipe 12. Therefore, the resin material and the fine powder material, which are sequentially supplied, are screw shafts 8 and 9
In between, it is kneaded and melted while being heated by a heater (not shown).
The fine powder material supplied from the supply pipe 12 is greatly suppressed from rising up because it escapes through the vent pipe 5 through the space 13 between the outer circumference of the open end of the supply pipe 12 and the inner circumference of the material supply port 6. Further, as a result, the fine powder material can be supplied in a desired mixing ratio, the productivity by kneading can be improved, and the biaxial kneader can be stably operated.

[Embodiment 2] FIG. 2 is an explanatory view of a twin-screw kneading machine according to another embodiment of the present invention, in which a is an enlarged cross-sectional view of a main part, and b is a Y-Y cross-sectional view of a. is there. What is shown in the present embodiment is basically the same as that of the twin-screw kneader having the structure shown in the first embodiment except for the first fixed amount supply device 3 and its supply pipe 11.

In the twin-screw kneader having the above-mentioned structure, pelletized resin raw material and fine powder material such as fine talc are mixed in a desired ratio in advance, and the mixture is passed through the supply pipe 12 of the second fixed amount supply device 4. The material is supplied to the material supply port 6 in the feed hopper 2. Therefore, also in the configuration of this embodiment, the resin material and the fine powder material, which are sequentially supplied, are kneaded and melted while being heated by the heater (not shown) between the screw shafts 8 and 9, but they are generated at that time. Gas, water vapor, etc. escape through the space 13 between the outer periphery of the open end of the supply pipe 12 and the inner periphery of the material supply port 6 and are exhausted from the vent pipe 5, so that the fine powder material supplied from the supply pipe 12 rises up. Greatly suppressed. Further, as a result, the fine powder material can be supplied in a desired mixing ratio, the productivity by kneading can be improved, and the biaxial kneader can be stably operated.

In the above examples, only the pellet-shaped resin raw material and the fine powder material such as fine talc were described as an example. In addition to these, additives and fillers are supplied, but the supply is performed by the resin. It may be supplied together with the raw material or the finely divided material, or may be supplied from another supply port. Also,
It goes without saying that the fiber can be supplied in the same manner when the fiber-reinforced resin is used.

[0015]

As described above, in the twin-screw kneader according to the present invention, the fine powder material is not lifted in the feed hopper while the gas or the like is discharged from the material supply port.
It is possible to supply a fine powder material in a desired mixing ratio, and it is possible to improve the productivity by kneading. Further, stable operation of the twin-screw kneader can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view of a twin-screw kneading machine according to the present invention, in which a
Is an enlarged sectional view of a main part, and b is an XX sectional view of a.

FIG. 2 is an explanatory view of another embodiment of the twin-screw kneading machine according to the present invention, in which a is an enlarged cross-sectional view of a main part, and b is a Y-Y cross-sectional view of a.

FIG. 3 is an explanatory view of a conventional twin-screw kneader, where a is an overall perspective view and b is a ZZ sectional view of a.

[Explanation of symbols]

1: Biaxial kneader body 2: Feed hopper
3: First fixed amount supply device 4: Second fixed amount supply device 5: Vent pipe
6: Material supply port 7: Cylinder 8, 9: Screw shaft 8
a, 9a: Shaft center line 10: Top lid 11, 12: Supply pipe 1
3: Space

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // B29K 105: 16 (72) Inventor Shin Takaraya 2-3-3 Shinhama, Arai-cho, Takasago-shi, Hyogo Kobe Co., Ltd. Steel Works Takasago Works (72) Inventor Makoto Honkon 2-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Kobe Steel Works Takasago Works, Ltd. (72) Masao Hirano 2-3, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 1 Inside Takasago Works, Kobe Steel, Ltd.

Claims (3)

[Claims] 1. A supply pipe for supplying a fine powder material is provided so as to extend in a feed hopper provided at a material supply port, and an opening end thereof is located between the biaxial screws in the vicinity of the material supply port. A twin-screw kneader characterized in that 2. In a twin-screw kneader in which a raw material resin supply pipe and a fine powder material supply pipe are provided above a feed hopper provided at a material supply port, the supply pipe for supplying the fine powder material comprises: A twin-screw kneader characterized in that it is provided so as to extend in a feed hopper provided at the material supply port, and its open end is provided between two screw screws in the vicinity of the material supply port. . 3. In a twin-screw kneader in which a feed pipe for a raw material resin and a fine powder material is provided above a feed hopper provided at a material feed port, the feed pipe is provided at a feed port provided at the material feed port. A twin-screw kneading machine, which is provided so as to extend in a hopper and whose opening end is provided between two-screw screws near a material supply port.