Kneading extruder

Abstract

Twist kneading disks are arranged such that the width of a piece of disk is 0.1 to 0.5 times the cylinder inner diameter D, a helix angle θ as an angle between a vertex of the front surface side of the disk and vertex of the rear surface side of the disk at the tip portion is in a range of 0°<θ<90° in the reverse rotating direction of the screws as viewed from a cross section of the disk in the end direction of the screw shaft, and a phase angle E as an angle in correlation between the disks around the screw shaft is in a range of 0°

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing installation positions of pressure indicators, as viewed from a cross section of the screw in the screw shaft direction in the embodiment 1;

FIG. 2 is a diagram showing installation positions of pressure indicators in the screw shaft direction in the embodiment 1;

FIG. 3A is a side view showing the configuration of TKD (twist kneading disk), and FIG. 3B is a cross section view of TKD indicated by the arrows A-A shown in FIG. 3A;

FIG. 4 is a schematic diagram showing the configuration of No. 1 screw in the plasticization kneading portion in the embodiment 1;

FIG. 5 is a schematic diagram showing the configuration of No. 2 screw in the plasticization kneading portion in the embodiment 1;

FIG. 6 is a schematic diagram showing the configuration of No. 3 screw in the plasticization kneading portion in the embodiment 1;

FIG. 7 is a schematic diagram showing the configuration of No. 4 screw in the plasticization kneading portion in the embodiment 2;

FIG. 8 is a schematic diagram showing the configuration of No. 5 screw in the plasticization kneading portion in the embodiment 2;

FIG. 9 is a schematic diagram showing the configuration of No. 6 screw in the plasticization kneading portion in the embodiment 2;

FIG. 10 is an experimental result in the embodiment 2, and a graph showing the comparisons of energy supplied to a plastic material in the cases of FK and TKD.

FIG. 11 is an experimental result in the embodiment 2, and a graph showing the temperature comparisons of a discharged resin in the cases of FK and TKD;

FIG. 12 is a schematic diagram showing the configuration of No. 7 screw in the plasticization kneading portion in the embodiment 3;

FIG. 13 is a schematic diagram showing the configuration of No. 8 screw in the plasticization kneading portion in the embodiment 3;

FIG. 14 is a schematic diagram showing one example of the plasticization kneading extruder for plastic material of related art;

FIGS. 15A and 15B are schematic diagrams showing another example of the plasticization kneading extruder for plastic material of related art; and

FIGS. 16A to 16C are side views showing examples of the kneading wings and cross section views as viewed from the kneading wings in the arrows A-A direction, in which FIG. 16A shows a feeding wing (forward kneading: FK), FIG. 16B shows a return wing (backward kneading: BK), and FIG. 16C shows a neutral wing (cross kneading: CK)

Claims

1. A kneading extruder comprising: a cylinder capable of heating and cooling; andtwin screws provided in the cylinder, the twin screws including in order from an upstream side thereof: a solid transporting portion;a plasticization kneading portion; anda first molten material transporting portion,wherein:the kneading extruder includes twist kneading disks having a length of more than 1.88 times a cylinder inner diameter D;the twist kneading disks comprise a plurality of disks, a width of each disk being 0.1 to 0.5 times the cylinder inner diameter D;a helix angle θ between a vertex of one surface side of the disk and a vertex of another surface side of the disk at a tip portion is in a range of 0°<θ<90° in a reverse rotating direction of the screws, as viewed from a cross section of the disk having a normal line equivalent to a screw shaft in an end direction of the screw shaft; anda phase angle E in correlation between the disks around the screw shaft is in a range of 0°<E<90°.

2. The kneading extruder according to claim 1, wherein the cylinder includes in order from the upstream side thereof: a feed port of material;a first vent; anda discharge port.

3. The kneading extruder according to claim 1, wherein the twist kneading disks are incorporated in the plasticization kneading portion.

4. The plasticization kneading extruder according to claim 1, wherein the twin screws further includes in order from the upstream side thereof: a molten kneading dispersion portion provided in a downstream of the first molten material transporting portion; anda second molten material transporting portion.

5. The kneading extruder according to claim 2, wherein, between the first vent and the discharge port, the cylinder includes in order from the upstream thereof: a side feeder; anda second vent.

6. The kneading extruder according to claim 4, wherein the twist kneading disks are incorporated in at least one of the plasticization kneading portion and the molten kneading dispersion portion.

7. The kneading extruder according to claim 6, wherein the twist kneading disks are incorporated in the molten kneading dispersion portion.

8. The kneading extruder according to claim 6, wherein the twist kneading disks are incorporated in the plasticization kneading portion.

9. The kneading extruder according to claim 6, wherein the twist kneading disks are incorporated in the plasticization kneading portion and the molten kneading dispersion portion.

10. The kneading extruder according to claim 1, further comprising: cross kneading disks in a downstream of the twist kneading disks.

11. The kneading extruder according to claim 10, further comprising: forward kneading disks interposed between the twist kneading disks and the cross kneading disks.