JPS5837628Y2 - extruder - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an extruder with crosstalk function.

Generally, this type of extruder uses a dalmage type screw in the cross-conducting section, but this type has a constant opening area between the screw and cylinder in the cross-conducting section, so the resin used has a low viscosity. In the case of melt resin, the passing speed in the kneading section increases, resulting in poor wire crosstalk.On the other hand, in the case of high viscosity melt resin, the resistance in the kneading part increases, slowing the passing speed, and the processing speed decreases. There was a drawback that it decreased.

Therefore, the present invention aims to provide an extruder which not only solves the above-mentioned drawbacks at once but also has new advantages by configuring the extruder to be able to adjust the speed of resin passing through the cross-conducting section.

An embodiment of the present invention will be described below in detail with reference to the drawings.

In the extruder 1 shown in FIGS. 1 to 5, 2 is a main screw, and a spiral dalmage 4 is attached to the outer periphery of a large diameter shaft 3 in the middle.
, 4, . . . are formed at appropriate intervals to form the dalmage screw 5.

An annular salt 6 is provided on the outer periphery of the central portion of the dalmage screw 5 to partition the middle of each dalmage 4, so that each dalmage 4 is in a discontinuous state.

Reference numeral 7 denotes a cylinder, and an annular groove 10 is formed on the outer peripheral surface 9 of the annular salt 6 at a position on the inner peripheral surface 8 facing the annular salt 6 at an appropriate interval.

Both side wall surfaces 11.11 of this annular groove 10 are formed into a narrowed surface.

12 is an adjusting means for moving the main screw 2 to an arbitrary position in the axial direction, and a sleeve 15 slidably fitted to the base end 13 of the main screw 2 via a key 14 is moved relative to the cylinder 7. The sleeve 15 is provided to rotate in a fixed position.
A drive gear 17 rotated by a motor 16 is mounted on the outer periphery of the
Attach the push screw 19 with the lock nut 18 to one end of the sleeve 15, and screw the push screw 19 into the main screw 2.
It is placed in contact with the

The operation of the extruder 1 configured as described above will be described.

When resin is supplied into the cylinder 7 from the inlet 20, the resin is transferred to the outlet 21 side by the main screw 2, and crosstalk is applied while passing through the dalmage 4 of the dalmage screw 5 during the transfer.

When passing through this dalmage 4, if the resin has a high viscosity, the flow of the resin will be poor. If the gap between the cylinder 7 and the annular groove 10 is left wide open, the resin passage speed will not be reduced, so that an appropriate kneading effect will be provided and the pressure inside the cylinder 7 will not increase abnormally.

In addition, when the viscosity of the resin is low, the flow of the resin is improved and crosstalk is reduced. However, by shifting the annular salt 6 to one side of the annular groove 10 as shown in FIG. If the gap is kept small, the resin passage speed will not increase.
Therefore, there is no possibility that the wire crosstalk is reduced or the pressure inside the cylinder 7 is abnormally reduced.

By adjusting the opening amount of the gap between the annular salt 6 and the annular groove 10 in accordance with the viscosity of the resin to be handled in this way, the flow of the resin in the crosstalk section can be adjusted to a desired speed, reducing crosstalk, Abnormal increases and decreases in the pressure within the cylinder 7 can be prevented.

In the above embodiment, adjacent dalmages 4 were formed in a separated state in the annular salt 6 portion, but as shown in FIG.
They may be formed in communication with each other.

As shown in the examples above, according to the extruder of the present invention, the opening area between the dalmage screw and the cylinder can be increased or decreased, so the passage speed of resin of any viscosity can be adjusted, and crosstalk can be reliably achieved, and the pressure inside the cylinder can be reduced. Abnormal rise or fall can also be prevented, and the resin temperature can be maintained at a desired value.

Furthermore, it has excellent advantages such as being able to adjust the extrusion pressure of the resin.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a longitudinal sectional view, Figure 2 being an enlarged view of the main parts of Figure 1, and Figure 3 being a cross section taken along line AA in Figure 2. 4 and 5 are sectional views showing the operating state, respectively, and FIG. 6 is a sectional view showing another embodiment. 2... Main screw, 3... Dalmage screw, 4... Dalmage, 6...
Annular salt, 7... cylinder, 10... annular groove, 12... adjustment means.

Claims (1)

[Scope of utility model registration request] In an extruder in which a Dalmage screw is formed in a part of the main screw, a ring salt is provided on a part of the outer periphery of the Dalmage screw to partition the middle of the Dalmage, and a ring salt is provided on the inner peripheral surface of the cylinder at a position opposite to the ring salt. An extruder characterized in that annular grooves are formed on the base outer peripheral surface at appropriate intervals, and adjustment means for moving the dalmage screw to any position in the axial direction is configured.