JPH0557725A - Kneader - Google Patents

Abstract

PURPOSE:To obtain an extremely high stirring and kneading effect while pressure is properly decreased when any additive is mixed in a raw material such as a synthetic resin raw material and a raw material for an edible paste product. CONSTITUTION:The kneading part 9 of a screw shaft 7A is formed of multi-line spirals 12A, 12B and 12C and a projection 13 with the approximately same height as the height of a flight 10 of a screw transferring part 11 at every 360 deg. on each line of the spirals 12A, 12B and 12C is provided and a recessed part 14 becoming deepest at the central part in the spiral direction between the projections 13 and 13 is formed. The phase angle between the projection 13 and 13 each other between the adjoining lines and the phase angle between the recessed parts 14 and 14 between the adjoining lines are set in such a way that they become the same angle as the open angle obtd. by dividing the circumference 360 deg. of the screw shaft 7A seen from the axial core direction of the screw shaft 7A by the number of lines of the multi-line spirals 12A, 12B and 12C and another screw shaft 7B formed as a spiral in the reverse direction to the screw shaft 7A is provided in parallel on at least one side part of the screw shaft 7A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screw type kneader used for extrusion of synthetic resin or rubber, injection molding, or kneading of kneaded food products.

[0002]

2. Description of the Related Art Conventionally, in order to improve the characteristics of resin raw materials, various organic substances and inorganic substances have been mixed and kneaded to be molded.

The same is true in the field of food products such as kneaded products, in which various powders are mixed in order to enhance nutritional value and taste.

Various screw shapes having special kneading parts have been developed and put to practical use so that the additives can be sufficiently stirred and kneaded with these raw material products.

However, in reality, when the kneading is emphasized, the discharge amount is reduced, and when the discharge amount is increased, the kneading cannot be performed sufficiently, which is a contradictory result.

A multi-screw type kneader using a plurality of screws is also used in order to prevent the discharge amount from decreasing, but some additives do not sufficiently knead the additives in the raw materials.

[0007]

SUMMARY OF THE INVENTION The present invention shows an extremely high stirring and kneading effect while appropriately releasing pressure when mixing any additive into a raw material such as a synthetic resin raw material or an edible kneading raw material, and the efficiency is improved. The purpose is to provide a kneader with good workability.

[0008]

According to the present invention, a cylindrical heating cylinder has a raw material inlet at one end and a discharge outlet at the other end, and a single screw shaft is mounted in the cylindrical heating cylinder. In the kneading machine, the kneading part of the single screw shaft is formed by a multi-screw spiral, and each spiral has a protrusion having a height substantially the same as the flight height of the screw transfer part at every 360 degrees. , A recess that is deepest at the central portion in the spiral direction is formed between the protrusions, and the phase angle between the protrusions between the adjacent threads and the phase angle between the recesses between the adjacent threads are viewed from the axial direction of the screw shaft. Is set so as to have an opening angle obtained by dividing the concentric circumference of 360 degrees by the number of multiple spirals, and is formed in a spiral in the opposite direction to the screw shaft on at least one side of the screw shaft. It is a kneading machine with different screw shafts arranged in parallel. It is characterized in.

[0009]

According to the present invention, in the kneading section in which a plurality of screw shafts are juxtaposed, the flight of each screw is eliminated, and regular irregularities in the spiral direction are provided on the entire outer peripheral surface of the multi-start spiral. Thus, the resin raw material, the kneaded product raw material, and the additive added to the resin raw material and the kneaded product raw material are repeatedly and continuously given a compression extension action in the radial direction and a compression extension action in the axial direction, while the protrusion side wall moves in the transfer direction. Give a feeding action.

Therefore, the additives are mixed while being surely dispersed in the resin raw material and the kneaded product, and a sufficiently kneaded product can be obtained at the transfer end of the kneading section.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The drawing shows a multi-axis kneading machine. In FIG. 1, this kneading machine 1 has a cylindrical heating cylinder (hereinafter abbreviated as a cylinder) 3 horizontally installed in a housing 2 and transfers the raw material from the cylinder 3. A raw material inlet 4 is provided at one end as the starting end side, and a discharge port 5 is provided at the other end as the raw material transfer end side, and a hand heater is provided on the outer peripheral portion of the cylinder 3.
2, and a total of three screw shafts 7A, 7B, 7C are rotatably mounted in parallel with each other inside the cylinder 3 as shown in FIG.

The above-mentioned screw shafts 7A, 7B, 7C have a gear-shaped crushing portion 8 at the base end portion corresponding to the raw material inlet 4.
The kneading part 9 is in the middle part and the normal flight 1 is in the tip part.
It is a rotating shaft integrally formed with a screw transfer unit 11 having 0.

Here, while the gear-like crushing portions 8 are meshed with each other, the screw shafts 7B, 7C on both sides of the screw shafts 7A, 7B, 7C described above are with respect to the central screw shaft 7A. To form a spiral in the opposite direction, and by driving the central screw shaft 7A in the X direction in FIG. 2, the screw shafts 7B and 7C on both sides also rotate in the directions of the arrows while meshing.

The kneading part 9 of each of the above-mentioned screw shafts 7A, 7B, 7C is formed by a multi-thread spiral, for example, a 3-thread spiral, and each spiral 12A, 12B, 1
In flight 2C, flight 1 of the screw transfer unit 11 every 360 degrees
The projections 13 having substantially the same height as 0 and having a flat surface are provided, and the recesses 14 that are deepest in the central portion in the spiral direction are formed between the projections 13 before and after screwing. Between adjacent strips, that is, between spirals 12A and 12B, 12B and 12C
As shown in FIG. 3, the mutual phase angle between the projections 13 and 13 and the mutual phase angle between the recesses 14 and 14 between the 12C and 12A are the circumference of the coaxial shaft 7 when viewed from the axial direction of the screw shaft 7. 36
The opening angle is set to 120 degrees, which is obtained by dividing 0 degrees by the number of threads of the multiple spirals 12A, 12B, 12C, that is, 3 degrees.

The transfer surfaces 15 ... Are formed by the side walls of the above-mentioned protrusions 13. Further, in the kneading part 9 of each of the screw shafts 7A, 7B, and 7C arranged in parallel, a protrusion 13 of one screw shaft is located in a recess 14 of the other screw shaft as shown in FIG. It is arranged. In FIG. 3, 16 is a hinge that connects the upper and lower sides of the cylinder 3, and 17 is a fixing bolt provided on the opposite side.

When a resin raw material or an edible kneaded product raw material mixed with an additive is fed into the raw material feeding port 4 of the multi-screw kneading machine 1 thus constructed, first, the gear-like pulverization under the raw material feeding port 4 is carried out. Raw materials and additives are finely crushed in part 8,
Transferred to the kneading section 9.

In the kneading section 9, the recess 14 and the projection 13 which are continuously formed are subjected to repeated compression and expansion in the axial direction. At this time, the projection 13 of one screw is used. , 13 are respectively located in the recesses 14, 14 of the other screw, the raw materials in the respective recesses 14 are compressed and expanded with a strong force, so that some raw materials are in the direction opposite to the transfer direction. It is forcibly regurgitated.

Moreover, the transfer surface 15 does not have a continuous projection 1.
Since it is formed by the side wall of No. 3, the back flow rate is relatively large, and kneading is performed by repeating transfer, distribution, mixing and back flow while depressurizing. At the transfer end of the kneading section 9, the additives are evenly distributed in the raw material and completely kneaded. Further, while being heated and melted by the hand heater 6, the screw transfer section 11 of the next stage reaches the discharge port 5. Be transferred.

In this way, in the kneading section 9, by eliminating the flight section of a normal screw and forming a restrictive unevenness along the spiral on the entire outer peripheral surface of the multi-start spiral,
As compared with the conventional kneading device having a flight, the dispersion stirring kneading effect has been remarkably improved while increasing the discharge amount.

FIG. 4 shows another embodiment in which a four-thread spiral as a multi-thread spiral is formed in the kneading part 9 of the screw shaft 7, and the spirals 12A, 12B, 12C, 12 of each thread are formed.
In flight D, flight 10 of screw transfer unit 11 is performed every 360 degrees.
The protrusions 13 having substantially the same height as the height are provided, and the recesses 14 which are deepest in the central portion in the spiral direction are formed between the protrusions 13 before and after the screwing, and the protrusions 13 between the adjacent strips are formed. The mutual phase angle of 13 and the mutual phase angle of the recesses 14 and 14 are 90 degrees obtained by dividing the circumference 360 degrees of the coaxial 7 by the number 4 of the multi-spiral spirals 12A to 12D when viewed from the axial direction of the screw shaft 7. It is set to open angle.

Even with this construction, the same operation and effect as the previous embodiment can be obtained. Therefore, in FIG. 4, the same parts as those in FIG. The description is omitted.

In each of the above-described embodiments, a combination of three screw shafts 7A, 7B, 7C has been described, but a combination of two screw shafts or a combination of four or more screw shafts may be used, and a multi-start spiral may be used. As a matter of course, in addition to the three and four articles of the embodiment, a multi-strip spiral having two or five or more articles may be used.

[Brief description of drawings]

FIG. 1 is an internal side view of a multi-screw kneading machine showing an embodiment of the present invention.

FIG. 2 is a plan view of the main part of FIG.

FIG. 3 is a vertical sectional view of a kneading section.

FIG. 4 is a schematic view showing another embodiment of the screw shaft.

[Explanation of symbols]

 3 ... Cylinder 4 ... Raw material input port 5 ... Discharge port 7A, 7B, 7C ... Screw shaft 9 ... Kneading part 10 ... Flight 11 ... Screw transfer part 12A-12D ... Multi-thread spiral 13 ... Projection part 14 ... Recessed part

Claims (1)

[Claims] 1. A cylindrical heating cylinder (3) having a raw material inlet (4) at one end and a discharge port (5) at the other end, and a single screw shaft in the cylindrical heating cylinder (3). (7A)
A kneading machine in which a kneading section (9) of the screw shaft (7A) is provided with a multi-row spiral (12A, 12B, 12).
C), and each spiral (12A, 12
B, 12C) screw transfer section (11) every 360 degrees
A protrusion (13) having substantially the same height as the height of the flight (10) and a recess (14) that is deepest at the center in the spiral direction is formed between the protrusions (13, 13). The phase angle between the protrusions (13, 13) and the phase angle between the recesses (14, 14) between the adjacent strips when viewed from the axial direction of the screw shaft (7A) is the circumference 360 of the coaxial (7A). The degree is set to be an opening angle divided by the number of threads of the multiple spiral (12A, 12B, 12C), and at least one side portion of the screw shaft (7A) with respect to the screw shaft (7A). A kneading machine in which another screw shaft (7B) formed in a reverse spiral is arranged in parallel.