JPH0448611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grooved cylinder that can be applied to an extruder or an injection molding machine.

FIG. 1 is a side cross-sectional view of a grooved cylinder in a conventional extruder, and FIG. 2 is a Y-Y cross-sectional view of FIG. In order to improve the feeding ability of raw resin in an extruder, it is effective to increase the frictional force between the grooved cylinder 1 and the resin in the rotational direction. To achieve this purpose, conventionally, a concave groove 3 is cut in the inner surface of the cylinder 1 in the axial direction of the cylinder, as shown in Figs. 1 and 2, to eliminate slippage of the resin in the rotational direction, and I was trying to make progress. This is called a grooved cylinder and was often used to improve extrusion performance. Note that 2 is a screw.

On the other hand, extruders are used to plasticize various resins, but the frictional force required between the cylinder and the resin differs depending on the resin. However, the grooved cylinder is not easy to replace, and therefore has the disadvantage that it is not possible to select the optimum groove for the resin used. Furthermore, it has been difficult to control the resin pressure beyond the supply section by changing the frictional force in this portion, using conventional methods other than control using the screw rotation speed.

The present invention was proposed to eliminate the above-mentioned conventional drawbacks, and by making the groove width of the grooved cylinder variable, it can be easily applied to various resins, and furthermore, it can be used to control the feeding capacity. In a grooved cylinder having a concave groove on the inner surface of the base of the cylinder of an extruder or injection molding machine into which the screw is rotatably inserted, that is, the end of the cylinder on the raw material supply side, Directed axially toward the inner circumferential surface of the cylinder end, one side parallel to the axis,
The other side surface is formed with a plurality of sawtooth grooves at equal intervals that are inclined with respect to the axis and intersect with the one side surface at the tip, and apart from this, the grooves have the same number and shape as the grooves, and have the same depth as the grooves. A sleeve having a plurality of serrated teeth having a thickness approximately equal to that formed at equal intervals on the tip thereof is provided, and the plurality of serrated teeth are engaged in the plurality of serrated grooves of the cylinder. A grooved cylinder is movably inserted into the cylinder so as to fit together, and the inner circumferential surface of the plurality of sawtooth teeth forms a part of the inner circumferential surface of the cylinder. This is what we intend to provide.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 3 to 6 show embodiments of the present invention, FIG. 3 is a side sectional view of a grooved cylinder, and FIG. The Z sectional view, FIG. 5, shows a P-P development (inner development) view of FIG. 4. Also, in Figure 6 there is an X in Figure 5.
~X cross section is shown.

Now, as shown in FIG. 5, the groove 7 of the grooved cylinder 5
The shape is a sawtooth shape that combines a part a parallel to the axis and an inclined part b, that is, a plurality of sawtooth grooves 7 are formed at equal intervals, where the two intersect at the tip. The groove diameter of the grooves 7 is a common diameter of each groove. Further, the groove 7 is formed on the inner surface of the base of the grooved cylinder 5, that is, the end of the cylinder on the raw material supply side.

On the other hand, a sleeve 6, which is formed separately and has an outer diameter slightly smaller than the groove diameter, has a plurality of serrated teeth such that its tip is combined with the cylinder 5. Note that 2 is a screw and 8 is a hole.

Now, the sleeve 6 is the concave groove 7 of the grooved cylinder 5.
A plurality of serrated teeth 6a having the same number and shape as , and having a thickness approximately equal to the depth of the recessed groove 7 are formed at equal intervals at the tip, and the sleeve 6 has the same number and shape as the serrations of the cylinder 5 . The cylinder 5 is arranged so that the plurality of serrated teeth 6a are engaged in the plurality of grooves 7 having a shape of
A plurality of serrated teeth 6 are movably inserted into the
The inner circumferential surface of the cylinder a forms a part of the inner circumferential surface of the cylinder 5. Figure 5 shows the grooved cylinder 5.
The inclined portion b of the sleeve 6 and the portion of the sleeve 6 which is inclined with respect to the axis of the tooth 6a are in contact with each other.

Next, the action will be explained. When the serrated sleeve 6 of the same shape is moved into the serrated cylinder 5 in the direction of A in FIG. 5, the groove width A becomes narrower, and when it is moved in the direction of B, the groove width A becomes wider. Therefore, by moving the sleeve 6, the groove width A can be easily changed.

Next, FIG. 7 is a developed view of the inner surface of the cylinder in an embodiment different from that shown in FIG. It is a combination of states. In this case, the concave groove 7 of the grooved cylinder 5
is not parallel to the axis of the cylinder, but the action,
There is no difference in effect from the previous embodiment.

Since the present invention is configured as described in detail above, the groove width A of the grooved cylinder can be easily changed, and by changing the groove width A, the frictional force of the cylinder can be changed. , it is possible to obtain a feeding force that matches the characteristics of the resin. Furthermore, since the feeding force in this part can be controlled, it is possible to control the pressure beyond the supply section.

[Brief explanation of the drawing]

Figure 1 is a side cross-sectional view of a grooved cylinder in a conventional extruder, Figure 2 is a Y-Y cross-sectional view of Figure 1, and Figure 3 is a cross-sectional view of a grooved cylinder in a conventional extruder.
The figure is a side sectional view of a grooved cylinder showing an embodiment of the present invention, FIG. 4 is a Z-Z sectional view of FIG. Figure 6 is the fifth
XX sectional view of the figure, and FIG. 7 is an inner development view of a grooved cylinder of an embodiment different from FIG. 5. Explanation of the main parts of the diagram, 2...Skrill, 5...
Grooved cylinder, 6... Sleeve, 6a... Teeth, 7
...concave groove, a...portion parallel to the axis, b...slanted part, A...groove width.

Claims (1)

[Claims] 1. In a grooved cylinder having a concave groove on the inner surface of the base of the cylinder of an extruder or injection molding machine into which a screw is rotatably inserted, that is, the end of the cylinder on the raw material supply side, there is a shaft on the inner circumferential surface of the end of the cylinder. A plurality of serrated grooves are formed at equal intervals in the direction, one side is parallel to the axis, the other side is inclined with respect to the axis, and the tip intersects with the one side. A sleeve is provided in which a plurality of serrated teeth having the same number and shape and a thickness approximately equal to the depth of the same concave groove are formed at equal intervals on the tip thereof, and the sleeve is attached to the plurality of serrated teeth of the cylinder. The plurality of serrated teeth are movably inserted into the cylinder so as to engage in the groove, and the inner peripheral surface of the plurality of serrated teeth forms a part of the inner peripheral surface of the cylinder. A grooved cylinder characterized by: