JPS59194821A - Composite resin molding machine - Google Patents

Abstract

PURPOSE:To disperse preheat and filler uniformly to resin by a method wherein a supplying zone is behalved and the screw groove spaces of the 2nd supplying zone near the plasticized and kneading zone are made larger than those of the 1st supplying zone. CONSTITUTION:A screw 2 is installed in a heating cylinder 1, a supplying zone 5 and a plasticizing and kneading zone 6 are provided on the screw 2 in order from the side of material supplying hole 3 and further the material supplying zone 5 is composed of the 1st supplying zone 13 and the 2nd supplying zone 15 in order from the side of the material supplying hole 3. The screw groove depth 14 in the 1st supplying zone 13 has the solid material carrying capacity equivalent to the plasticizing capacity of the plasticizing and kneading zone 6 and the screw groove depth 16 of the 2nd supplying zone 15 is made larger than the groove depth 14. In this manner, the material supplied from the supplying hole 3 is sent to the plasticizing and kneading zone 6 having a free boundary surface to disperse the preheat and the filler, etc. successfully.

Description

[Detailed description of the invention] The present invention relates to a composite resin molding machine.

Composite molding is a method of mixing various fillers into plastic materials and dispersing them homogeneously to achieve various purposes such as strength improvement, two-dimensional stability, and cost reduction.
Direct composite molding, in which filler and resin are directly supplied to a molding machine such as an extrusion molding machine or an injection molding machine to perform molding, contributes in many ways to cost reduction, energy saving, and labor saving.

The present invention is also useful in extruders, particularly in
This is for A1 in an injection molding machine, and relates to the shape of a screw for a composite molding machine.

The most important point in direct composite molding is to heat the resin and filler sufficiently, melt the resin under low pressure rather than under high pressure, and mix the filler when the resin has a high viscosity. 4I, but the prerequisite for this is to stabilize the plasticization and to perform it efficiently to ensure uniform dispersion of the filler and equalization of the temperature of the molten resin. supplying it in a stable condition, and
It is necessary that preheating is always stable.

FIGS. 1(a), (b), and (c) show a conventional injection molding machine,
For example, it shows the state of supply of materials in a vent-type injection molding machine. In the figure, l is a heating cylinder, 2 is a screw, and 3 is a supply hole for lumber 1.

4 is a feeder, 5 is a supply zone, 6 is a plasticization kneading zone, and 7 is a vent hole.

FIG. 1(a) shows a state in which plasticization is started immediately after injection is completed, and material is started to be supplied from the feeder 4 through the supply hole 3. FIG. 1(b) shows a state in which plasticization metering has been completed, and the screw groove section of metering stroke a shows a state in which no material is supplied. FIG. 1(C) shows a state in which injection is completed, and similarly, a metering stroke section a near the supply hole 3 shows a state in which no material is supplied.

In the case shown in FIGS. 1(a) to (C), the screw rotation is intermittent rotation only during plasticization, and there is an injection process in which the screw 2 simply moves forward, and a plasticization process in which the screw 2 does not rotate and then retreats. Therefore, the supply of material to the supply zone 5 of the screw 2 is intermittent and discontinuous. Therefore, there are variations in the preheating method in the supply zone 5, which causes variations in the transportation capacity, and variations in the pressure generation state of the plasticizing and kneading zone 6, which causes variations in dispersion and resin temperature. There is a drawback.

As mentioned above, the material transferred to the plasticizing and kneading zone 6 of the screw 2 is preheated in the supply zone 5 for 1 minute, and is at a uniform temperature. It is necessary. 1. As shown in (a) to (C), the material fed by the feeder 4 is starved feed, but the feed zone 5 is smaller than the capacity fed by the feeder 4.
Since the feeding capacity is larger, it immediately passes through the supply zone 5, is not sufficiently preheated, and moves to the 0T plasticization and kneading zone 6, where it is softened and melted, which is necessary for smooth kneading in the plasticization 41 and kneading zone 6. yA; Or, because the sealing is not completed, there is a drawback that the filler is not well dispersed or the filler is damaged due to forced plasticization.

In addition, if the material is not supplied by the feeder 4 but is directly connected to the hopper 8, as shown in FIG. There is no heat transfer to the material near the groove center (=J) from the outside, and there is a drawback that a uniform R temperature cannot be obtained as a whole, resulting in poor dispersion.

The present invention eliminates these drawbacks, and has a free boundary surface that allows the materials to move freely in the screw groove in the screw feeding zone, ensuring relative movement between the materials and ensuring uniformity of the material in the screw groove. The proportion of the material occupying the screw groove space in the feed zone is kept constant so that the temperature can be raised to a constant value, and the feed zone continues from the transport space of the screw groove near the bottom of the feed hole in the feed zone to the plasticizing and kneading zone. In order to increase the transportation space of the screw groove and avoid applying excessive pressure and shearing action to the material in the plasticization kneading zone, the screw pitch should be increased as the screw groove becomes shallower toward the resin discharge side. The purpose of the present invention is to reduce breakage of the filler, avoid secondary agglomeration of the filler, and enable stable plasticization with good dispersion.

Next, the present invention will be explained with reference to embodiments shown in the drawings.

FIG. 3 shows one embodiment of the invention. A screw 2 that is rotatable or rotatable and slidable in the axial direction is built into the heating cylinder 1, and the screw 2 sequentially moves from the supply hole 3 side to the supply zone 5. A plasticizing kneading zone 6 is formed, the screw diameter 9 of the feeding zone 5 is smaller than the screw diameter 10, the screw pitch 11 of the plasticizing kneading zone 6 is larger than the screw pitch 9 of the feeding zone 5, and ++ (plasticizing The screw pitch 11 is increased as the screw cap 12 of the kneading zone 6 becomes smaller.When the material equivalent to the plasticizing capacity of the plasticizing kneading zone 6 passes through the supply zone 5, the screw cap 12 in the vicinity of the supply hole 3 of the supply zone 5 The screw groove depth is 1 so that the screw groove of the first supply zone 13 is filled with material.
4 is defined, the screw groove depth 16 of the second feeding zone 15 from the first feeding zone 13 to the plasticization kneading zone 6 is such that the material does not completely fill the screw groove and has a free space 17; The material is designed to be able to move freely by the rotation of the screw 2. In the case of an injection molding machine, if the length of the first supply zone 13 is made slightly longer than the entire injection stroke, the first supply from the supply hole 3 can be stabilized at any metering position during plasticization. zone 13
The material that has been quantitatively and continuously passed through is in the second supply zone 15 where the screw groove space is enlarged, and there is a free space 17, so that
As the screw 2 rotates, it moves freely in the screw groove like the material in a tumbler. mixed to avoid separation,
In addition, all fillers and resin in the screw groove come into contact with the screw wall and heating inner wall, and the entire material is preheated uniformly. This prevents the material from being subjected to a large shearing action locally in the plasticizing and kneading zone 6, and the filler from being wrapped in the locally melted resin, leaving the material as a whole in the form of a freshly melted resin. Because the medium-molecular heated filler is kneaded into the highly viscous resin all over the place without much force, breakage of the filler, undispersed lumps of filler, and filler hardened by the molten resin are engulfed and redispersed. Secondary aggregation of the filler, which would otherwise occur, also no longer occurs.

Further, by making the screw pinch 9 smaller, the IN opening length of the screw groove of the supply gene 5 becomes longer, and a preheating distance of 1 minute can be obtained, which has the great advantage of further promoting the above-mentioned effect. Note that the screw pitch 9 of the supply gene 5 is set to a screw diameter of 10 in order to lengthen the development length of the screw groove in the supply zone 5 and to improve transport efficiency.
The filling rate of the material in the second supply zone 15 is set to 70 to 90% of hf.
9) It is preferable to select the screw groove depth 16 so that it is 0 to 70%. In the atomization kneading zone 6, the screw groove depth 12 becomes shallow, the screw pitch 11 is set large, and the shape of the passage cross section gradually becomes flat, so that the overall softened or melted material is Since the filler is deformed and is more efficiently affected by external heating, it can be subjected to shearing action under small pressure and can avoid secondary agglomeration of the filler. In particular, in the case of non-grade resin and filler, since the screw 2 is filled with softened and molten material in the UR plasticizing and kneading zone 6, the screw pitch 11 is adjusted to the screw groove depth so that the passage cross-sectional area is constant. It is effective to maintain a low pressure and avoid secondary agglomeration by setting the diameter to 12.

Thus, as described above, the present invention has the great effect of reducing breakage of the filler, making uniform dispersion possible without undispersed lumps and secondary aggregation of the filler, and achieving stable plasticization. There is.

FIG. 4 shows another embodiment of the present invention, in which the screw groove depth 18 in the feed zone 5 is made constant instead of two steps in the embodiment of FIG. The pitches 19 and 20 are made into two stages, and the screw pitch 2 of the second supply zone 15 is set from the screw pitch 19 of the first supply zone 13.
This is an example in which 0 is increased.

Furthermore, in order to increase the deaeration effect, as shown in Figure 5,
Deaeration holes 21 may be provided in the intermediate supply zone area. Moisture and air between the fillers should be discharged when the material is introduced into the plasticizing and kneading zone 6, but by providing the deaeration hole 21, this can be thermally exhausted by 1 inch, and the resin between the fillers can be discharged. It is very effective for impregnation or one-time mixing.

In this way, in the present invention, as described in the claims, the filler is uniformly mixed and preheated uniformly so that the filler is uniformly dispersed and does not separate from the resin, and the filler is not damaged. Therefore, a good plasticized cross-wire condition can be easily obtained without fail. Therefore, it becomes easier to obtain a composite molded product of good quality.

[Brief explanation of the drawing]

Figures 1(a) to 1(c) show one of conventional devices similar to the present invention.
FIG. 2 is a longitudinal sectional view showing another example of the conventional device; FIGS. 3, 4, and 5 are longitudinal sectional views showing different embodiments of the present invention. It is a diagram. ■... Heating cylinder, 2... Screw, 3... Supply hole,
4... Feeder, 5... Supply zone, 6... Possible
W chemical training zone, 7...vent hole, 8...honpa,
13... First supply zone, 15... Second supply zone, 21... Deaeration hole 1) Applicant: Ube Industries, Ltd.

Claims (6)

[Claims] (1) Freely rotatable in the 8 cylinder, or 4i rotatably
A screw that can slide freely in the direction of the 1+ line is provided, and the screw connects the supply zone and the plasticization kneading gene from the 6th side of the material supply ship to the 11th direction.
The supply zone is composed of a first supply zone, a second supply zone from the material supply side, and the first
The space between the screw grooves 1 in the supply zone is defined as the first screw groove space which has a solid material transport capacity equivalent to the plasticizing capacity of the if (forming kneading zone), and the second screw drawing space of the second supply zone is defined as the first screw groove space. A composite resin molding machine characterized in that a solid material or a free boundary (jr+i) is fed by moving it further away from a groove space. (2) The depth of the screw groove of the A/W Kakyo Ren tool is 1.
11. The composite resin molding machine according to claim 1, wherein the screw pitch is increased as the screw pitch becomes gradually shallower toward the exit direction. (3) Adjust the screw pinch of the supply zone to 70 mm of the screw diameter.
Claims 1 or 2, where the percentage is 90%,
Composite resin molding machine. (4) Material filling rate in the second supply zone is 140 to 70
%. A composite resin molding machine as set forth in claim 1 or 2. (5) The composite resin molding machine according to claim 1 or 2, characterized in that a deaeration hole is provided in the second supply zone of the heating cylinder. (6) The composite resin molding machine according to claim 1 or 2, wherein the length of the first supply zone is larger than that of the full injection stroker.