JPH0337495B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin kneading and plasticizing apparatus.

By mixing various fillers into plastic materials,
Composite molding is strongly desired in the injection molding processing industry as a method for homogeneously dispersing materials and achieving various objectives such as improving strength, dimensional stability, reducing costs, and substituting other materials.

In composite injection molding, instead of the conventional method of using composite pellets that have already been filled and mixed with filler using an extruder or kneader, a direct blend method is used in which the filler and plastic material are directly fed to an injection molding machine and molded. This greatly contributes to the objectives of cost reduction, energy saving, and labor saving. An excellent technique for achieving this purpose is the invention disclosed in Japanese Patent Publication No. 47847/1983.

Although this technique is an extremely excellent technique for dispersing and kneading fillers, it has the disadvantage that the plasticizing ability is reduced and no improvement in productivity can be expected, and the stability of plasticization is also slightly lacking.

The present invention eliminates these drawbacks and provides a resin kneading and plasticizing apparatus that has excellent kneading and dispersion effects, prevents deterioration of plasticizing ability, and can perform composite molding with high productivity.

Figure 1 shows an example of the conventional technology (Japanese Patent Publication No. 56-47847), in which a material supply zone 4 and a plasticization kneading zone 5 are provided between the material supply port 2 and the vent hole 3 of the heating cylinder 1. A plurality of grooves 6 are provided in the axial direction inside the screw 1, and a multi-thread screw 8 is provided in the plasticizing and kneading zone 5 of the screw 7. A cross section of the groove 6 and the multi-start thread 8 is shown in FIG. In FIG. 2, arrows shown by two-dot chain lines indicate the direction of rotation of the screw 7, and solid arrows indicate the flow state of the resin.
As shown in Fig. 2, the propulsion side 10 of the flight ridges 9 of the multi-thread screw is formed at right angles to the direction of rotation of the screw 7, and the screw diameter gradually decreases on the side 11 opposite to the propulsion side of the flight ridges 9. It is formed so that Therefore, the backward movement of the material from the multi-thread groove space 12 to the groove space 13, which is the groove 6 of the heating cylinder 1, is carried out by the relative movement between the heating cylinder 1 and the screw 7 when the screw 7 rotates. That is, as shown in FIG. 3, which is a developed view, a part of the resin material to be transferred forward by the flight propulsion side 10 of the multi-thread screw 8 climbs over the flight crest 9 and reaches the heating cylinder 1. It leaks through the axial groove space 13 to the rear multiple thread groove space 12 . This is the reason why the kneading and dispersion is excellent, but it is also the reason why the plasticizing ability is decreased. Furthermore, the axial groove 6 of the heating cylinder 1 is connected to the plasticization kneading zone 5 or the material supply port 2.
The fact that there is continuous communication between the vent hole 3 and the vent hole 3 is the reason why it is difficult to maintain the pressure inside the heating cylinder 1, resulting in a low pressure, which is an excellent advantage in that the filler is less likely to be cut and damaged. This is also the reason why it becomes unstable.

The present invention maintains these advantages while eliminating the disadvantages and provides a superior device.

To this end, in the present invention, in the resin kneading and plasticizing apparatus, a plurality of axially intermittent recesses are provided on the inner surface of the heating cylinder in the plasticizing and kneading zone of the heating cylinder, and single or single recesses are provided in the plasticizing and kneading zone of the screw. A dalmage portion having a plurality of dalmages was provided.

Next, the present invention will be explained with reference to embodiments shown in the drawings. In the present invention, the same parts as in the conventional apparatus shown in FIGS. 1 to 3 are denoted by the same reference numbers, and the explanation thereof will be omitted.

4 to 7 show one embodiment of the present invention. As shown in FIG. 4, the plasticization kneading zone 5 on the inner surface of the heating cylinder 1 is provided with a plurality of recesses 20 arranged in a staggered manner and intermittent at a desired limited length in the axial direction. As shown in FIG. 5, the plasticizing and kneading zone 5 of the screw 7 has a recess 20 provided with a plurality of dullages 21, and the shape and arrangement of the dullage flights 22 and flight groove spaces 23 in the dullage 21 portion are as follows. For example, as shown in the cross-sectional view of FIG. 6 and the developed view of FIG. 7, the cross-sectional shapes of the flight groove space 23 and the recess 20 are, for example, a simple circular arc shape. In this case, the dalmage flight clearance has the same dimensions as the screw flight clearance, for example.

As shown in FIG. 7, when the dullage flights 22 of the dullage 21 come to the position of the recess 20 of the heating cylinder 1, the material in the groove space 23 between the dullmage flights 22 is removed by the screw rotation of the screw 7 and the heating cylinder 1. Due to the relative movement, it moves over the dalmage flights 22 and into the groove space 23 between the dalmage flights 22 at the rear. However, unlike the method of the prior art described above, the groove-shaped recess 2 on the inner surface of the heating cylinder 1 in the axial direction
Since the 0 is not continuous but is arranged in an intermittent staggered manner, leakage flow to the rear is limited and a decrease in plasticizing ability can be prevented. Furthermore, the axial spacing 24 between the recesses 20 of the heating cylinder 1 makes it possible to stably maintain the propulsion pressure that propels the material, thereby eliminating instability in plasticizing and metering. Therefore, variations in kneading and resin temperature can also be eliminated. On the other hand, since the Dalmage flight 22 moves relative to the heating cylinder 1 both in the rotational direction and the axial direction, the material can overcome the Dalmage flight 22,
In the process of moving through the space of the heating cylinder recess 20 to the groove space 23 of the rear dalmage 21, kneading operations such as turning and overlapping are performed in which dalmage groove space 2.
Material No. 3 was also uniformly received, and the excellent dispersion function was not lost. In other words, the present invention prevents the deterioration of the plasticizing ability, minimizes breakage of the filler, maintains the propelling pressure of the 21 parts of dalmage to be stably measured, and sufficiently maintains the kneading and dispersion function. It has a great effect.

Further, to explain the dullage 21 part of the present invention in detail, as shown in FIG. Of course, this is the flight clearance a of the screw necessary to maintain the necessary propulsion pressure, but a part of the flight clearance is shown in Figure 8.
7 and another dullage flight clearance 27 which can be expanded as shown as dimension b and may be referred to as a shearing clearance so that the material can overcome the flights 22 and be subjected to shear shearing action.
If provided, a large effect on kneading and dispersion can be obtained. In this case, the dullage flight clearance 26 indicated by the dimension a was made the same as the screw flight clearance, and the dullage flight clearance 27 indicated by the dimension b was made larger than the screw flight clearance a.

In addition, this shearing clearance, Dalmage Flight Clearance 27, is the 9th to
As shown in FIG. 11, it is desirable to make the entrance side clearance b ₁ of the dalmage 21 section large and the exit side clearance b ₂ small. In other words, in regions where the viscosity of the resin is high, it is desirable to perform large kneading actions such as compression, deformation, turning, and overlapping without applying strong shearing action, whereas in regions where the viscosity is low, it is desirable to perform kneading actions such as compression, deformation, turning, and overlapping. This is because it is desirable to reduce the clearance and give a better dispersion effect to the material whose viscosity has decreased. Therefore,
The 21st part of Dalmage can also be made like this.

Further, the dalmage 21 section shown in FIG. 12 is composed of a dalmage 30 and a dalmage 31, and if each of them exists independently and is rotated in the normal rotation direction, the rotation will propel the material forward. It is also possible to provide a dulbage 31 whose material has a reverse feeding effect with respect to the dullage 30, but in that case, the dullage flight clearances 26 and 27 are made larger than the screw flight clearance a, so that the shearing action is more effective than the reverse feeding action. It is better to focus on

Furthermore, other embodiments of the recesses 20 on the inner surface of the heating cylinder 1 are described, such as recesses 20 that are long in the circumferential direction and arranged in a staggered manner as shown in FIGS.
As shown in Figures 1 to 18, it is possible to provide a recess 20 in which a plurality of recesses divided in the circumferential direction are arranged in a staggered manner in the axial direction. This can prevent the propulsion pressure of the plasticizing and kneading section from decreasing, preventing the kneading function from decreasing, and contributing to improving the plasticizing ability and stabilizing the plasticizing.

As described above, according to the present invention, as described above, it is possible to reliably and easily obtain excellent plasticizing kneading with excellent kneading and dispersion and stable plasticizing measurement without causing a decrease in plasticizing ability.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of conventional devices similar to the present invention, where Figure 1 is a longitudinal sectional view, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is a developed view. 4 to 7 show the first embodiment of the present invention. FIG. 4 is a vertical sectional view of only the heating cylinder, FIG. 5 is a vertical sectional view showing the screw and heating cylinder, and FIG. 6 is a vertical sectional view of the heating cylinder. FIG. 7 is a developed view, FIG. 8 is a cross-sectional view of the heating cylinder and dalmage portion showing the second embodiment of the present invention, and FIG.
The figure is a front view of the dalmage part showing the third embodiment of the present invention, FIG.
Fig. 1 is a sectional view taken along the line XI-XI in Fig. 9, Fig. 12 is a front view of the dalmage section showing the fourth embodiment of the present invention, and Fig. 13 is a longitudinal cross-section of the heating cylinder showing the fifth embodiment of the present invention. The front view, Figures 14 and 15 are respectively No. 13.
16 is a vertical sectional view of a heating cylinder showing a sixth embodiment of the present invention, and FIGS. 17 and 18 are a sectional view and a sectional view taken along a line in FIG. −
FIG. 1...Heating tube, 2...Material supply port, 3...Vent hole, 4...Material supply zone, 5...Plasticization and kneading zone, 6...Groove, 7...Screw, 8...Multi-thread screw , 20... recess, 21, 30, 31... dalmage, 22... dalmage flight, 23...
Groove space, 26, 27... Dalmage flight clearance.

Claims (1)

[Claims] 1. Consists of a heating cylinder and a screw rotatably and slidably provided in the heating cylinder in the heating cylinder, and the inside of the heating cylinder is arranged from the material supply port side to the material supply zone, plasticization kneading zone, In a resin kneading and plasticizing apparatus in which a zone, a degassing zone, and a metering zone are sequentially formed, a plurality of axially interrupted recesses are provided on the inner surface of the heating cylinder in the plasticizing and kneading zone of the heating cylinder, and the plasticization of the screw A resin kneading and plasticizing device in which a dullage section having a single or plural dullages is provided in a plasticizing and kneading zone. 2 The dullage flight clearance of the dullage part of the plasticization kneading zone of the screw is made larger than the screw flight clearance for at least one of the dullage flights, so that shearing action is applied to the material in the dullage flight clearance part. A resin kneading and plasticizing apparatus according to claim 1. 3. Make the clearance of the Dalmage flight in the Dalmage part of the plasticization kneading zone of the Skrill larger than the Scrillage flight clearance of at least one Dalmage flight, and make the Dalmage flight clearance upstream of the Dalmage part equal to the Dalmage flight clearance of the downstream Dalmage flight. The resin kneading and plasticizing apparatus according to claim 1, wherein the clearance is larger than the clearance. 4. The kneading of the resin according to claim 1, wherein a dullage flight is provided so that at least one dullage in the dullage portion propels the material backward, and the dullage flight clearance is larger than the screw flight clearance. Plasticizing equipment.