JPH0832425B2 - Continuous mixer for raw materials for forming colored resin tubes - Google Patents

Description

Detailed Description of the Invention

[0001]

[Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous mixer for a colored resin tube forming raw material which supplies the raw material to an extruder for producing a colored resin tube.

[0002]

2. Description of the Related Art Conventionally, as a raw material supplied to an extruder for molding a colored resin tube, a small amount of red or yellow colored pellets is added to a white granular resin pellet as a main raw material so that a desired color can be obtained. A mixer was provided for mixing, and the mixture was supplied to the extruder in a so-called constant volume type (batch) type.

[0003]

However, in the conventional method, in order to continuously mold a resin tube having a desired color, since the amount of the pellets of the added color is small, there is a possibility of being affected by static electricity generated by stirring. It has the drawback that color spots are likely to occur, and it is extremely difficult to maintain and manage the desired color tone, and the mixing trough also requires a large installation site because it is large and bulky. Since the discharge amount of the extruder changes as the filter provided at the outlet is clogged, there is a risk that the tone of the molded resin tube tends to be shaded and the product cannot be used as a product.

[0004]

In view of the above-mentioned conventional drawbacks, the present invention provides a raw material supply hopper in which a main raw material such as granular resin is stored, and a raw material supply hopper provided below the raw material supply hopper.
Supply pipe and a pipe installed further below the supply pipe.
Clew type extruder and the side of the middle of the supply pipe
One or more granular auxiliary materials are stored.
Of the auxiliary hopper and the auxiliary hopper and the supply pipe
Connected to the auxiliary material input port opened near the center of the part
The screw type feeder connected to the motor
In an apparatus comprising without, said raw material supply hopper
Is supported by a load measuring device between the supply pipe and the supply pipe.
A metering hopper is provided, and when continuously supplying the auxiliary raw material to the supply pipe, the interval between the time when the main raw material in the measuring hopper decreases and the time when the main raw material is supplied from the raw material supply hopper to the measuring hopper. Continuation of the amount of auxiliary material supplied to the supply pipe by controlling the number of revolutions of the electric motor placed under the auxiliary hopper in inverse proportion to It is a mixer.

[0005]

In order to use the continuous mixer for the colored resin tube molding raw material according to the present invention, as shown in FIG. 1, first, a commercially available extruder 5 for molding a resin tube is operated to heat it. When the raw material of the kneaded resin tube is discharged from the extrusion port 16 of the screw 10, the pellet-shaped resin raw material filled in the supply pipe 4 and the weighing hopper 3 is discharged from the extrusion port 16 of the extruder 5. The pellet-shaped main raw material with which the weighing hopper 3 is filled is gradually pushed downward, the electric motor 7 placed under the sub-hopper 6 continues to operate, and the pellet-shaped auxiliary raw material inside the sub-hopper is screwed. It is charged into the inside of the supply pipe 4 from the charging port 9 by the formula feeder 8.

When the main raw material inside the weighing hopper 3 is exhausted, a signal is emitted from the load measuring device 2 (load cell etc.), and the air cylinder 12 provided at the lower end of the raw material supply hopper 1 operates the shutter plate 11 to start the raw material. The main raw material in the supply hopper 1 falls into the weighing hopper 3 and is filled therewith, and at the same time, a signal is again issued from the load measuring device 2, the air cylinder 12 operates, and the shutter plate 11 is closed. The auxiliary raw material is mixed with the main raw material from the raw material supply hopper 1 below the charging port 9 , sufficiently mixed in the dance portion 18 of the extruder 5, and sufficiently kneaded by the heat type screw 10, and the extrusion port 16 It is more discharged as a resin tube raw material.

Also , the reduction of the main raw material in the weighing hopper 3
Time to do and raw material supply hopper 1 to weighing hopper 3
The amount of auxiliary raw material to be mixed with the main raw material can be delicately adjusted by controlling the rotation speed of the electric motor 7 in inverse proportion to the interval with the time when the main raw material is supplied to the extruder. 5 can always be supplied with a stable color. Further, in order to change the color of the raw material for molding the resin tube, there is a method of controlling the rotation speeds of the electric motors 7 of the plurality of sub-hoppers 6 so as to obtain a desired color, or it is provided inside the supply pipe 4. An air cylinder 14 is provided immediately before the input port 9 from each of the sub hoppers 6 provided in association with the shutter plate 13 to open and close the shutter plate 13 to change the color of the raw material immediately and satisfactorily.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 is a raw material supply hopper having a cylindrical main raw material and having a pellet-shaped main raw material. An air cylinder 12 is provided in the lower part in association with a shutter plate 11 which can be opened and closed. 1, a weighing hopper 3 supported by the load measuring device 2 is provided below the weighing hipper 3, and a prismatic supply pipe 4 for supplying the raw material to the extruder 5 is provided below the weighing hipper 3 at an intermediate portion of the supply pipe 4. One or a plurality of sub hoppers 6 for accumulating pellet-like colored granular sub raw materials are provided alongside, and an electric motor 7 mounted on a mount 19 is provided below each sub hopper 6. attached, the shaft of the electric motor 7 a screw feeder 8 for pushing the auxiliary material to the supply pipe 4 is attached, is turned to be Oite opening near the inside center of the supply pipe 4 by a shutter plate 13 that is linked to the air cylinder 14 Controlling the introduction of secondary raw material to 9.

The supply pipe 4 is connected to the upper part of the extruder 5, and a filter 15 is provided at an extrusion port 16 of the extruder 5. That is, the main raw material and the auxiliary raw material which are sufficiently mixed in the dance portion 18 below the supply pipe 4 are the heat type screw 1
0 passes through the filter 15 of the extrusion port 16, but when the filter 15 becomes clogged with the kneaded main raw material and auxiliary raw material, the consumption amount of the raw material supplied to the extruder 5 through the supply pipe 4 Will decrease and the time for the main raw material temporarily stored in the weighing hopper 3 to decrease will also be delayed. By making the rotation speed of the electric motor 7 slow in inverse proportion to the interval between the time when the main raw material is reduced and the time when the main raw material is supplied from the raw material supply hopper 1 to the weighing hopper 3, The sub-materials to be mixed can be made uniform, and the color unevenness of the raw material supplied to the extruder 5 can be eliminated and made uniform.

[0010]

Since the present invention is constructed as described above, the following effects are produced. That is, since the mixing section is not required, it has an excellent feature that the size of the apparatus can be reduced as compared with the conventional mixer, and unlike the constant volume type batch type, the extruder 5 can be continuously used. Granular resin raw material can be supplied to the auxiliary hopper 6.
Since a small amount of the granular colored resin auxiliary raw material from (3) can be extruded by the screw type feeder 8, the raw material having a delicate color can be supplied to the extruder 5. In addition, although the raw material consumption changes due to the clogging of the filter 15 at the tip of the extruder 5, in the present invention, the main raw material is fed from the raw material supply hopper 1 to the weighing hopper 3 while the main raw material in the measuring hopper 3 is decreasing. Continuously minutely feeding the auxiliary raw material into the central portion of the supply pipe 4 by controlling the number of revolutions of the screw type feeder 8 and the electric motor 7 which supply the auxiliary raw material in inverse proportion to the interval of the supply time. Therefore, the tube having a desired color can be continuously manufactured. Further, the input port 9 opening near the center of the inside of the supply pipe 4 smoothly supplies and mixes the main raw material and the auxiliary raw material to the extruder 5, and a shutter provided between the input port 9 and the screw type feeder 8. Since the auxiliary hopper 6 and the auxiliary raw material used can be switched by the plate 13 and the color can be completely switched, the waste of the raw material can be eliminated, which is also extremely economical.

[Brief description of drawings]

FIG. 1 is a side view showing a continuous mixer for a colored resin tube molding raw material according to the present invention.

FIG. 2 is a plan view showing a continuous mixer of a colored resin tube molding raw material according to the present invention.

[Explanation of symbols]

1 Raw Material Supply Hopper 2 Load Measuring Device 3 Weighing Hopper 4 Supply Pipe 5 Extruder 6 Sub Hopper 7 Electric Motor 8 Screw Feeder 9 Input Port 10 Heat Type Screw 11 Shutter Plate 12 Air Cylinder 13 Shutter Plate 14 Air Cylinder 15 Filter 16 Extrusion Port 17 Tachometer 18 Dance part 19 Mounting base 20 Mounting base

Claims (1)

[Claims] 1. A raw material supply hopper (1) for storing a main raw material such as granular resin, and a raw material supply hopper (1)
The supply pipe (4) provided below and the supply pipe (4)
A screw type extruder (5) provided further below,
One or more in the middle of the supply pipe (4)
Auxiliary hopper that stores individual granular auxiliary materials
(6), these auxiliary hoppers (6) and the supply pipe
Input of auxiliary material opened near the center of (4)
The connected screen of the electric motor (7) connecting with the mouth (9)
Device comprising at least a feeder (8)
In said raw material supply hopper (1) and supply pipe (4)
Between the weighing device supported by the load measuring device (2)
A hopper (3) is provided, and when continuously supplying the auxiliary material to the supply pipe (4), the weighing hopper (3) is used.
Was placed in the lower part of the sub hopper (6) in inverse proportion to the interval between the decreasing time of the main raw material and the time of feeding the main raw material from the raw material supply hopper (1) to the weighing hopper (3). A continuous mixer for a raw material for forming a colored resin tube, wherein the supply amount of the auxiliary raw material to the supply pipe (4) is controlled by controlling the rotation speed of the electric motor (7).