JP2666093B2 - 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] The conventional high kneading screw shown in FIGS. 4 and 5 is shown.
FIG. 4 is a partially cut longitudinal 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 compression section CZ, and a measurement section MZ. The screw 1 branches off from the main flight α at the boundary between the supply section FZ and the compression section CZ, and the compression section CZ and the measurement section MZ. again at the boundary of MZ, the first sub-flight beta ₁ to coalesce with the main flight α-face, branched from the main flight α of the boundary portion of the compression section CZ and the metering unit MZ, again screw tip direction, the main It is configured to have a second auxiliary flight beta ₂ which merges with flight alpha.

Then, it is divided respectively to the first secondary flight beta ₁ and the second sub-flight beta resin material supply screw groove 2 at ₂ and semi-molten plasticized resin screw groove 3 and the molten plasticized resin discharge side screw groove 4.

Further, the gap between the cylinder barrel 5 and the first auxiliary flight beta ₁ in the compression section CZ is constant constantly towards the metering unit MZ side from the supply unit FZ side, further, also in the metering section MZ, 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 It is configured to be.

In FIG. 4, 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 compression section CZ, the solid resin is blocked by the first sub-flight β ₁ , and with the rotation of the screw 1, a molten film is formed between the cylinder barrel 5 and the solid resin by the strong shearing action of the screw 1. The melting of the surface of the solid resin is rapidly promoted by the shearing force. Thus, the molten resin is transported over the first sub-flight beta ₁ in a semi-molten plasticized resin screw groove 3. The molten resin is further although the semi-molten plasticized resin screw groove 3 is transferred to the second molten plasticized resin discharge side screw groove 4 rides over the sub-flight beta _2, a cylinder barrel 5 of the first sub-flight beta ₁ in the gap between the gap and the second sub-flight beta ₂ between the former cylinder barrel 5
When toward the first sub-flight beta ₁ of the gap has become larger than the latter, the second molten resin to overcome secondary flight beta ₂ receives a more powerful shearing force, is completely melted.

[Problems to be Solved by the Invention] As described above, in the conventional high kneading screw,
The kneadability is low because the first sub flight is arranged as a weir between the main flights in the compression unit, and the second sub flight is arranged as a weir between the main flights in the measuring unit MZ.
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 Problems] In order to solve such a problem, in the present invention, a resin material supply side screw groove, a semi-molten plasticized resin side screw groove, and a molten plasticized resin discharge are provided in a partial range of a screw. In a multi-flight high kneading screw provided with a sub flight separated into a side screw groove, a depth of the resin material supply side screw groove,
The semi-molten plasticized resin-side screw groove and the molten plasticized resin discharge-side screw groove continuously and gradually decrease from the deep groove portion to the shallow groove portion with respect to the resin injection direction, and the first multiple of the resin injection direction. At the flight formation start point, the resin material supply side thread groove depth is made deeper than the semi-molten plasticized resin side screw groove and the molten plasticized resin discharge side screw groove depth, and the next multiple flight in the resin injection direction. At the starting point of formation, the depth of the thread groove on the semi-molten plasticized resin side is made deeper than the thread groove on the molten plasticized resin discharge side, and the depth of each thread groove decreases at a constant rate until the end point of multiple flight formation. did.

[Operation] In the compression section, a resin flight on the resin material supply side, a sub-flight for forming a weir on the semi-molten plasticized resin-side thread groove and the molten plasticized resin discharge-side screw groove are arranged, and with respect to the injection direction of the resin. , The depth of the screw groove for the resin material supply, the screw groove for the semi-molten plasticized resin and the screw groove for the discharge side of the molten plasticized resin are continuously and gradually reduced. Is made deeper than the depths of the semi-molten plasticized resin screw groove and the molten plasticized resin discharge side screw groove, so that a certain amount of resin sent from the supply side is not blocked between multiple flights and the pushing force is stable Therefore, the amount of extrusion is not regulated, the color change becomes easy, and the kneading property is remarkably improved.

1 to 3 show one embodiment of a high kneading screw according to the present invention, FIG. 1 is a partially cut longitudinal sectional view of the high kneading screw, FIG. FIG. 3 is A in FIG.
The flow state of the resin in each cross section from point D to point D is shown.

In FIG. 1, the screw 1 is divided into a supply section FZ, a compression section CZ, and a measuring section MZ. Further, a first sub flight β ₁ and a second sub flight β ₂ are provided in the compression unit CZ,
The first sub flight β ₁ and the second sub flight β ₂ are divided into a resin material supply screw groove 2, a semi-molten plasticized resin screw groove 3, and a molten plasticized discharge side screw groove 4, respectively.

Furthermore, branches from the primary flight α of the boundary portion of the compression section CZ supply unit FZ, again at the boundary of the compression portion CZ and the metering unit MZ, the first sub-flight beta ₁ to coalesce with the main flight α-face, Branching from the main flight α near the center of the compression section CZ,
Is configured to have a second auxiliary flight beta ₂ which merges with the main flight α-face again at the boundary of the CZ the metering unit MZ.

As shown in FIG. 3, Z ₁ and cylinder barrel 5 a first gap between the sub-flight beta ₁ in the compressed portion CZ, also the cylinder barrel 5 when the second gap between the sub-flight beta ₂ and Z _2, cylinder barrel 5 and the clearance Z ₁ of the first and secondary flights beta ₁
Is constantly constant from the supply unit FZ side to the measuring unit MZ side, and the gap Z ₂ between the cylinder barrel 5 and the second auxiliary flight β ₂ is also constant, so that Z ₁ > Z ₂ Is configured.

Furthermore, regarding the depth of the thread groove in the compression part CZ,
First, the screw groove 2 on the resin material supply side has a configuration in which the depth gradually decreases from the deep groove to the shallow groove in the resin injection direction so that H ₁ > H ₂ > H ₃ > H _4. I have.

Also, the semi-molten plasticized resin side thread groove 3 in the compression part CZ
The depth of H ₅ from the deep groove to the shallow groove in the resin injection direction.
> H _6> H _7> have continuously made a tapering configuration so that H _8. Further, the main flight α branches off from the semi-molten plasticized resin side screw groove 3 and the molten plasticized resin discharge side screw groove 4
In the second form the starting point near the secondary flight beta ₂ for separating,
The depth H ₇ of the semi-molten plasticized resin-side screw groove 3 is deeper than the depth H _{9 of} the molten plasticized resin discharge-side screw groove 4 (H ₇ > H ₉ ).
It has become. In the second form the end point vicinity of the sub-flight beta ₂ of the second sub flights beta ₂ is combined with the main flight α-face, the resin material supplied side screw groove 2 of the depth H _4, semi-molten plasticized resin approximately the same depth H ₁₀ side screw groove 3 depth H ₈ and molten plasticized resin discharge side screw groove _{4 (H 4 = H 8 =} H 10)
It is configured to be.

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 compression unit CZ, solid resin which has moved from the supply unit FZ is dammed by the first sub-flight beta _1, with the rotation of the screw 1, is melted film between the cylinder 5 and the solid resin by its strong shearing action The melting of the surface of the solid resin is rapidly promoted by the shearing force of the formed 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,
Wherein the cylinder barrel 5 made smaller than the gap Z ₁ between the first sub-flight beta _1, further, to semi-molten plasticized resin screw groove 3 and the molten plasticized resin discharge side screw groove 4 is shallow, further screw 1 more Receiving the shearing energy of rotation,
The resin is completely melted, and the kneading property is improved. Particularly, in the present invention, the resin group that is retained in the resin material supply screw groove 2, the semi-molten plasticized resin screw groove 3, and the molten plasticized discharge side screw groove 4 in the compression section CZ is formed in the axial direction of the screw 1. The feed unit FZ moves smoothly from the feed unit FZ side to the weighing unit MZ side, and a certain amount of resin sent from the feed group FZ side is blocked by this triple flight unit, and the pushing force is stabilized. The quantification is constant.

In the embodiment of the present invention, the gap Z ₁ between the cylinder barrel 5 and the first sub flight β ₁ in the compression section CZ is
Has dealt with the case of the cylinder barrel 5 was greater than the gap Z ₂ between the second sub-flight beta _2, it is not limited thereto, substantially the same effect is obtained even Z ₁ = Z _2.

Further, in the embodiment of the present invention, the second and third threads are branched between the main flights α, and the first and second threads are separated into a resin material supply thread groove and a semi-molten plasticized resin thread groove. A high kneading screw having a triple flight consisting of a flight and a second sub-flight of a third screw thread which is separated into the semi-molten plasticized resin screw groove and the molten plasticized resin discharge side screw groove has been described. The present invention is not limited to this, and the flight may be a multiple flight in which the thread is branched into fourth or more routes.

In the embodiment of the present invention, the second sub flight β
_Although the position where ₂ branches off from the main flight α has been described in the case where it is near the center of the compression section CZ, it is not limited to this, and it may be branched from any position of the compression section CZ.

[Effects of the Invention] As is apparent from the above description, in the present invention, the depth of the resin material supply-side screw groove, the semi-molten plasticized resin-side screw groove, and the molten plasticized resin discharge-side screw groove are made of resin. The depth of the resin material supply side thread groove is continuously reduced gradually from the deep groove portion to the shallow groove portion with respect to the injection direction of the resin, and at the start point of forming the first multiple flight in the resin injection direction, The depth of the screw groove on the plasticized resin side and the depth of the screw groove on the discharge side of the molten plasticized resin, and the depth of the screw groove on the semi-molten plasticized resin side at the starting point of the formation of the next multiple flight in the injection direction of the resin, By making it deeper than the screw groove on the discharge side and decreasing the depth of each screw groove at a fixed rate until the end of multiple flight formation, a certain amount of molten resin sent from the supply side is Flow over The speed and pressure are increased, and the kneading property is remarkably improved. In addition, the resin is not blocked between the flights and the pushing force is stabilized, so that the extruding amount is not restricted, and the color change is easy.

[Brief description of the drawings]

1 to 3 show a high kneading screw according to the present invention.
FIG. 1 is a partially cut longitudinal sectional view of a high kneading screw, FIG. 2 is a screw development view, and FIG. 3 is A to FIG.
The flow state of the resin in each section at point D is shown. 4 and 5 show a conventional high kneading screw, FIG. 4 shows a partially cut longitudinal sectional view of the high kneading screw, and FIG. 5 shows 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… Measurement unit, CZ… Compression unit, FZ… Supply unit

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-202835 (JP, A) JP-A-61-227003 (JP, A)

Claims (1)

(57) [Claims] 1. A multi-flight high kneading screw provided with a sub-flight for separating a screw groove on a resin material supply side, a screw groove on a semi-molten plasticized resin side and a screw groove on a molten plasticized resin discharge side in a partial area of the screw. The depth of the thread groove on the resin material supply side, the thread groove on the semi-molten plasticized resin side and the thread groove on the molten plasticized resin discharge side are gradually reduced from the deep groove portion to the shallow groove portion in the resin injection direction. None, and at the first multiple flight formation start point in the resin injection direction, the resin material supply side thread groove depth is deeper than the semi-molten plasticized resin side screw groove and the molten plasticized resin discharge side screw groove depth. In addition, at the start point of the next multiple flight formation in the resin injection direction, the depth of the semi-molten plasticized resin side thread groove is made deeper than the molten plasticized resin discharge side thread groove, and the mutual thread groove is formed until the end of the multiple flight formation. of High kneading screw which is characterized in that is adapted to decrease at a constant rate of.