JP2519575B2 - High kneading screw - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high kneading screw applicable to an injection molding machine and an extrusion molding machine.

[Prior Art] FIGS. 4 and 5 show a conventional high kneading screw.
FIG. 4 is a partially cut vertical sectional view of the high-kneading screw, and FIG. 5 is a screw development view of FIG.

In FIG. 4, the screw 1 is divided into a supply section FZ, a melting section CZ, and a measuring section MZ, and branches from the main flight α at the boundary between the supply section FZ and the melting section CZ to obtain the melting section CZ and the measuring section. First sub-flight β ₁ merged at the boundary of MZ, fusion zone CZ, and metering zone
It is configured to have a second auxiliary flight β ₂ that branches from the main flight α at the boundary of the MZ and merges in the direction of the screw tip.

Then, the resin material supply screw groove 2, the semi-molten plasticized resin screw groove 3, the molten plasticized resin discharge side and the groove 4 are respectively divided by the first sub flight β ₁ and the second sub flight β ₂ .

Further, the gap between the cylinder barrel 5 and the first sub-flight β ₁ in the fusion zone CZ is constantly constant from the supply section FZ side toward the measurement section MZ side, and further, in the measurement section MZ, similarly, the cylinder barrel 5 and is also a constant second gap between the sub-flight beta _2, towards the cylinder barrel 5 of the first gap between the secondary flight beta ₁ is a cylinder barrel 5 greater than the second gap between the sub-flight beta ₂ Is configured to be.

In FIG. 4, the resin supplied from the hopper 6 to the supply unit FZ receives the thermal energy from the non-resin heater and the shear energy due to the rotation of the screw 1, and is gradually melted and transferred forward.

In the fusion zone CZ, the solid resin is blocked by the first sub-flight β ₁ , and as the screw 1 rotates, a strong shearing action forms a molten film between the cylinder barrel 5 and the solid resin. The shearing force rapidly accelerates melting of the surface of the solid resin. Thus, the molten resin is transported over the first sub-flight beta ₁ in a semi-molten plasticized resin screw groove 3. Although the molten resin is further transferred from the semi-molten plasticized resin screw groove 3 to the molten plasticized resin discharge side screw groove 4 over the second sub-flight β ₂ , the melted resin is transferred between the cylinder barrel 5 and the first sub-flight β ₁ . With respect to the gap and the gap between the second sub-flight β ₂ , the former gap between the cylinder barrel 5 and the first sub-flight β ₁ is larger than that of the latter, and the second sub-flight β ₂ is overcome. The molten resin is subjected to a stronger shearing force and is completely melted.

[Problems to be Solved by the Invention] As described above, in the conventional high kneading screw,
Since the first sub-flight is arranged as a weir between the main flights in the melting section, and the second sub-flight is arranged as a weir between the main flights in the measuring section MZ, the kneading property is low,
If the gap between the cylinder barrel and the first sub-flight and the second sub-flight is reduced in order to improve the kneading property, there is a disadvantage that the processing capacity is reduced.

[Means for Solving the Problem] In order to solve such a problem, in the present invention, among the screws having a supply part, a melting part, and a measuring part, a weir is formed by the melting part. The first sub-flight of the second screw thread for branching the second and third screw threads to separate the resin material supply screw groove and the semi-molten plasticized screw groove, the semi-melted plasticized resin screw groove and the melted plasticized resin A triple-flight high kneading screw comprising a second sub-flight of a third screw thread, which is separated into a discharge-side screw groove, wherein the resin material supply screw groove is provided.
The depths of the semi-molten plasticized screw groove and the screw groove of the melted plasticized resin discharge side screw groove continuously and gradually decrease with respect to the injection direction of the resin, and branch from the starting point of the melting portion. One flight and a second sub-flight branched from the central area of the fusion zone are arranged, and the first sub-flight and the second sub-flight are combined at the end point of the fusion zone.

[Operation] Since the first sub-flight and the second sub-flight for forming a weir are arranged in the fusion zone, and the depth of the thread groove is continuously reduced with respect to the injection direction of the resin, from the supply side. A certain amount of the resin sent is not blocked between triple flights and the pushing force is stable, so that the extrusion amount is not regulated and the kneading property is significantly improved.

[Embodiment] FIGS. 1 to 3 show an embodiment of a high kneading screw according to the present invention. FIG. 1 is a partially cut vertical sectional view of the high kneading screw, FIG. 2 is a screw development view, and FIG. Figure 3 is A of Figure 2
The flow state of the resin in each cross section from point D to point D is shown.

In FIG. 1, the screw 1 includes a supply section FZ, a melting section CZ,
It is divided into the weighing unit MZ. In addition, in the fusion zone CZ, the first
The sub-flight β ₁ and the second sub-flight β ₂ are provided, and the resin material supply screw groove 2, the semi-molten plasticized resin screw groove 3 and the melt plastic are formed in the first sub-flight β ₂ and the second sub-flight β _2. Each of the chemical discharge side screw grooves 4 is divided. Then, as shown in FIG. 2, a first auxiliary flight β ₁ and a second auxiliary flight β ₂ forming a weir are arranged in the fusion zone CZ, and the first secondary flight β ₁ is from the starting point of the fusion zone CZ. While branching, the second sub-flight β ₂ is branched from the central region of the fusion zone CZ, and the first sub-flight β _{1 is} branched at the end point of the fusion zone CZ.
And the second sub-flight β ₂ are combined. Then, along the resin flow direction, first, a so-called resin material supply screw groove 2 in which the main flight α and the first sub flight β ₁ are asymptotically constitutes a V zone. Subsequently, a V zone similar to the above is formed in the semi-molten plasticized resin screw groove 3 between the first sub-flight β ₁ and the second sub-flight β ₂ . Further, as shown in FIG. 3, the gap between the cylinder barrel 5 and the first auxiliary flight β ₁ in the fusion zone CZ is Z ₁ , and the gap between the cylinder barrel 5 and the second auxiliary flight β ₂ is
Assuming Z ₂ , the gap Z ₁ between the cylinder barrel 5 and the first sub-flight β ₁ is constantly constant from the supply unit FZ side toward the metering unit MZ side, and further, the cylinder barrel 5 and the second sub-flight β ₂ The gap Z ₂ between and is also constant, and is configured such that Z ₁ > Z ₂ .

Further, in the present invention, as shown in FIG. 3, the depth of each thread of the resin material supply thread groove, the semi-molten plasticized resin thread groove and the melted plasticized resin discharge side thread groove is equal to the resin injection direction. On the other hand, it has a configuration in which the taper is gradually reduced.

The operation of the high kneading screw configured as described above will be described.

In FIG. 1, the resin supplied from the hopper 6 to the supply unit FZ receives heat energy from a heater (not shown) and shear energy due to the rotation of the screw 1, and is transferred forward while gradually melting.

In the melting section CZ, the solid resin that has moved from the supply section FZ is blocked by the first sub-flight β ₁ , and as the screw 1 rotates, a molten film is formed between the cylinder 5 and the solid resin due to its strong shearing action. The melt formed on the surface of the solid resin is rapidly accelerated by the shearing force of the molten film.

Further, the molten resin that has traveled over the first sub-flight β ₁ , when traveling over the second sub-flight β ₂ ,
Gap Z ₂ between the cylinder barrel 5 and the second sub flights beta ₂ is,
For the cylinder barrel 5 that the smaller than the gap Z ₁ between the first sub-flight beta _1, further sheared energy by rotation of the screw 1, the resin is completely melted, to improve the kneadability. Further, in particular, in the present invention, the fusion zone
The resin group that stays in the resin material supply thread groove 2 in the CZ, the semi-molten plastic fruit resin thread groove 3 and the melt plasticizing discharge side thread groove 4 moves in the axial direction of the screw 1 from the supply section FZ side to the measuring section MZ.
Each of them moves smoothly to the side, and a fixed amount of resin sent from the supply group FZ side is blocked by this triple flight, the pushing force is stabilized and the metering is performed constantly.

In the present invention, the case where the gap Z ₁ between the cylinder barrel 5 and the first sub-flight β ₁ in the fusion zone CZ is made larger than the gap Z ₂ between the cylinder barrel 5 and the second sub-flight β ₂ . However, the present invention is not limited to this, and almost the same effect can be obtained even when Z ₁ = Z ₂ .

[Advantages of the Invention] As is apparent from the above description, in the present invention, the first sub-flight and the second sub-flight for forming a weir in the fusion zone.
Since a sub-flight is arranged and the depth of the screw groove is gradually reduced in the resin injection direction, a certain amount of resin sent from the supply side is not blocked between triple flights. Since the pushing force is stable, the extrusion amount is not regulated and the kneading property is significantly improved.

[Brief description of drawings]

1 to 3 show a high kneading screw according to the present invention.
An example is shown, FIG. 1 is a partially cut vertical cross-sectional view of a high-kneading screw, FIG. 2 is a screw development view, and FIG.
The flow state of the resin in each cross section at point D is shown. 4 and 5 show a conventional high kneading screw, FIG. 4 is a partially cut vertical sectional view of the high kneading screw, and FIG. 5 is a screw development view of FIG. 1 ... Screw, 2 ... Resin material supply screw groove, 3 ... Semi-molten plasticized resin screw groove, 4 ... Molten plasticized resin discharge side screw groove, 5 ... Cylinder barrel, 6 ... Hopper, α ... … Main flight, β ₁ …… First sub flight, β ₂ …… Second sub flight, MZ …… Measuring section, CZ …… Melting section, FZ …… Supply section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-202835 (JP, A) JP-A-60-242013 (JP, A) Jitsuko 55-49945 (JP, Y2)

Claims (1)

(57) [Claims] 1. A screw having a supply part, a melting part, and a measuring part, wherein the second and third screw threads forming a weir in the melting part are branched to form a resin material supply screw groove and a semi-melted part. It is composed of a first sub-flight of the second screw thread that separates into the plasticized screw groove, and a second sub-flight of the third screw thread that separates into the semi-molten plasticized resin screw groove and the melted plasticized resin discharge side screw groove. A triple flight high kneading screw, wherein the depth of the resin material supply screw groove, the semi-molten plasticized screw groove and the melt plasticized resin discharge side screw groove is continuous in the resin injection direction. The first sub-flight that branches from the start point of the fusion zone and the second sub-flight that branches from the central area of the fusion zone, and the first sub-flight is branched at the end point of the fusion zone. High flight characterized by combining flight and second deputy flight Kneading screw.