JPS6311122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a continuous kneading roll used for kneading molding materials such as phenolic resin molding materials.

[Background technology]

When kneading the molding material using a kneading roll,
By wrapping the molding material 100% around one of the pair of rolls with different rotational peripheral speeds, the shearing force and rolling force caused by the difference in the rotational peripheral speed of both rolls acts on the molding material, resulting in a kneading effect. It will be done.
However, in the case of a molding material containing a large amount of fiber, such as a heat-resistant molding material made of phenolic resin, there is a problem that the winding around the roll is not stable and the efficiency of kneading is reduced. Therefore, the molding material is supplied to one end of the roll, the molding material is kneaded and sequentially moved to the other end of the roll, and the kneaded molding material is cut out from the other end of the roll. Even if there is a continuous kneading roll that is capable of continuous kneading rather than batchwise kneading, the winding is not stable, and especially with such a continuous kneading roll, the kneaded material cannot be cut unless the winding is stable. This is a huge problem. In other words, the kneaded material is usually wound around rolls whose circumferential speed is set at a low and high temperature, but as kneading progresses, the reaction of the molding material decreases, and as the temperature of the molding material rises, the viscosity increases. In this case, the kneaded molding material cannot be cut out from the roll on which the molding material should originally be wound.

[Purpose of the invention]

The present invention has been made in view of the above points, and it is an object of the present invention to provide a continuous kneading roll that can perform kneading efficiently and that does not hinder the cutting of the kneaded material.

[Disclosure of the invention]

However, in the continuous kneading roll according to the present invention, the front roll 1 is set at a high circumferential speed and high temperature, and the rear roll 2 is set at a high circumferential speed and high temperature.
is set to low circumferential speed and low temperature, and the front roll 1 and rear roll 2
The kneaded material supply section 3 is on one end between the
A cutting blade 4 is provided at the other end of the front roll 1, and a mechanism for moving the kneaded material supplied to the kneaded material supply section 3 to the other end is provided on the front roll 1 and the back roll 2, respectively. This is characterized by setting the front roll 1 at a high circumferential speed and high temperature, and setting the rear roll 2 at a low circumferential speed and low temperature, so that all of the kneaded material is wound around the rear roll 1 at a low circumferential speed in the initial stage. The above object is achieved by completely winding the kneaded material around the front roll 1 at a high circumferential speed and high temperature in the latter stage.

The present invention will be explained in detail below with reference to Examples. Figure 1,
FIG. 2 shows an embodiment of the present invention, in which the front roll 1 has a peripheral speed set higher than that of the rear roll 2. The speed ratio is preferably about 1.1 to 1.5. Normally, the front roll 1 is around 80℃ and the rear roll 2 is around 130℃.
The front roll 1 is set at a lower temperature than the rear roll 2, such as ~140°C, but in the present invention, the front roll 1 is set at a lower temperature than the rear roll 2, such as the front roll 1 at 130~140°C and the rear roll 2 at 80°C. Set the temperature to be higher than that of roll 2. Further, on the rear roll 2, a plurality of material gathering blades 5 whose lower edges are formed in an arc shape and are in contact with the surface of the rear roll 2 are provided at equal intervals and inclined with respect to the axis of the rear roll 2. The inclination angle θ of this material gathering blade 5
is preferably set to about 70±15°, and the distance between the material gathering blades 5 is set as a:b=a, b in Fig. 1.
It is best to set the ratio to 7:5. The thickness of the material gathering blade 5 is desirably about 3 mm in order to maintain strength and not become a hindrance to material feeding. Angle β in Fig. 2
is preferably 45±20°. Further, a horizontal plow blade 6 is arranged on the front roll 1 so that the cutting edge contacts the upper end of the front roll 1, and the upper surface side of this plow blade 6 is at an angle of about θ=70±15° with the axis of the front roll 1. A plurality of inclined material gathering blades 10 are integrally attached. The plow blade 6 and the material gathering blade 10 constitute a turning frame 7. Furthermore, a cutting blade 4 is disposed at the end of the front roll 1 so that its cutting edge contacts the outer periphery of the front roll 1.

In the continuous kneading roll formed as described above, a kneaded material 8 such as a molding material is supplied to the kneaded material supply section 3. The kneaded material 8 first winds around the roll 2 at a low circumferential speed where it is easy to wind around, and undergoes a kneading action. The kneaded material 8 is moved along the rear roll 2 by the material gathering blade 5 while being subjected to the kneading action. When subjected to the kneading action in this manner, the temperature of the kneaded material 8 rises due to heating due to shear heat generation and heat generation accompanying the progress of the reaction, and the viscosity of the kneaded material also increases. In this state, the kneaded material 8 is easily wrapped around the front roll 1 at a high circumferential speed, and since the front roll 1 is set to a high temperature, all of the kneaded material 8 that has moved to the middle of the rear roll 2 is wrapped around the front roll 1. Move to roll 1 and wrap around front roll 1. The kneaded material 8 transferred to the front roll 1 in this way is further kneaded between the front and rear rolls 1 and 2, and when passing over the plow blade 6, the kneaded material 8 is peeled off from the front roll 1 and cooled. At the same time, the kneaded material 8 is sent along the front roll 1 by the feeding action of the resin moving blade 10. The kneaded material 8 that has been kneaded in this way is scored for cutting by a scoring roller 9, and then cut out by a cutting blade 4.
It is cut out with a certain width.

〔Effect of the invention〕

As described above, in the present invention, by setting the front roll at a high circumferential speed and high temperature, and setting the rear roll at a low circumferential speed and a low temperature, initially the kneaded material is transferred to the low circumferential speed rear roll where it is easy to wrap. In the latter stage, the temperature increases and the kneaded material, which tends to be easily wrapped around the high-temperature rolls, can be completely wrapped around the high-temperature front roll at high circumferential speed, and even materials containing a large amount of fibrous material can be kneaded. Kneading can be carried out efficiently with the material always wrapped around either the front or back roll, and in the latter stage, all of the kneaded material is wrapped around the front roll, so the kneaded material can be fed from the front roll without any hindrance. It is something that can be cut out.

In addition, the results of experiments using the continuous kneading roll of the present invention shown above show that when the front roll 1 is set at 130°C and the rear roll 2 is set at 80°C, the kneading material made of the asbestos fiber-containing phenolic resin molding material teeth,
In the initial stage, 100% of the kneading material is wrapped around the rear roll 2, and just before entering the fourth resin gathering blade 5 in Fig. 1, all the kneaded materials are transferred to the front roll 1 and wrapped around the front roll 1, and the rest is done. It was fed along the front roll 1 and could be cut out by the cutting blade 4, and good results could be obtained. Conversely, the front roll 1 is 90℃ and the rear roll 2 is 131℃.
When this setting was made, the kneaded material that was initially wrapped around the rear roll 2 began to be half wrapped around the rear roll 2 and the front roll 1 halfway through.

[Brief explanation of the drawing]

FIG. 1 is a top view of an embodiment of the present invention, and FIG. 2 is a side view of the same. 1 is a front roll, 2 is a rear roll, 3 is a kneading material supply section, and 4 is a cutting blade.

Claims (1)

[Claims] 1 The front roll is set to a high peripheral speed and high temperature, and the rear roll is set to a low peripheral speed and low temperature, one end between the front roll and the rear roll is used as a kneading material supply part, and the other end of the front roll is 1. A continuous kneading roll characterized in that a cutting blade is provided at one end, and a mechanism is provided on a front roll and a back roll to move the kneaded material supplied to the kneaded material supply part to the other end.