JPH02160033A - Pellet extruder - Google Patents

Abstract

PURPOSE:To obtain pellet-shaped materials having a uniform compounding state by disposing a front screw, a rotary disk formed with plural holes, a stationary disk formed with the plural holes, and a rear screw in this order, thereby constituting the screw device. CONSTITUTION:The screw device 4, a die 11 for extrusion and a cutter 12 are disposed. This device 4 is constituted of the front screw 13, the rear screw 14 and a kneading mechanism 15 provided between the screws 13 and 14. This kneading mechanism 15 is constituted of the rotary disk 16 which rotates together with the screw 13 and is formed with plural holes penetrating in the axial direction of the screw between the disk 16 and the screw 14 and the stationary disk 17 which is fixed and disposed in the state facing the disk 16. As a result, the unequal kneading of the raw materials is eliminated as far as possible simply by passing the raw material once through the pellet extruder and the pellet-shaped materials having the uniformly compounded state are obtd.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention mainly relates to a pellet extruder for kneading chemical materials such as soap and extruding them into pellets of a predetermined size. A screw device is used to knead and convey raw materials taken out from a vacuum tank to reduce the water content in the raw solution, and an extrusion die is located at the end of the conveyance of the screw device. A pellet extrusion engine with a cutter installed on the side.

[Conventional technology]

Conventionally, as shown in Figure 8, a die (11 ), and a rotary cutter (12) is arranged on the opposite side of the die (11) to cut the material extruded from the die (11) into pellets of a predetermined length. Extruders are known.

[Problem to be solved by the invention]

The pellet extruder according to the conventional technology performs extrusion molding while uniformly kneading the raw materials by conveying them with a screw, and at the same time, a cutter is arranged so that the material can be cut into pellets of a predetermined size. It was designed so that it could be formed.

If the material is made into a pellet shape, it can be easily stored in a container such as a silo or a box, and has excellent handling properties.

Pellet-shaped materials are made into products by undergoing processes such as coloring, flavoring, and kneading in the next process, and then finishing them into a predetermined shape. A lot depends on how good or bad it is.

Recently, it has been found that conveyance by screws alone is insufficient to even out the blended state of raw materials. In other words, visible kneading unevenness may occur in the pellet-shaped material. The fact that putu (sandfill) still exists has become known as G (IPJ).

Therefore, in order to improve the kneading defects, attempts have been made to install a dedicated mixing device after the rotary cutter, or to duplicate the process, such as processing the formed pellets again in the kneading machine. However, although the defective kneading was improved, the process was long (which worsened work efficiency and productivity was low), which were new problems that could not be solved.

The object of the present invention is to avoid the above-mentioned problems by eliminating uneven kneading of raw materials as much as possible by passing the raw materials through a pellet extruder only once, thereby making it possible to obtain a pellet soft material with a uniform blending state.

[Means to solve the problem]

In order to achieve the above object, the present invention provides the pellet extruder described at the beginning, in which the screw device is composed of a front screw, a rear screw, and a kneading mechanism provided between these front and rear screws, and the kneading mechanism is , a rotating disk connected to the conveying end of the front screw, rotating together with the front screw, and having a plurality of holes penetrating in the axial direction of the screw; and between the rotating disk and the rear screw. It is characterized by comprising a fixed disk having a plurality of holes penetrating in the direction of the screw axis and fixedly disposed opposite to the rotating disk.

It is preferable that the pitch of the rear screw is larger than the pitch of the front screw.

Further, the rear screw may be omitted and the die may be arranged near the downstream side of the conveyance side of the kneading mechanism.

[For production]

According to the above configuration, the raw material conveyed by the front screw is dispersed and extruded through the plurality of holes of the rotating disk,
Then, while being subjected to the kneading action of shearing in the direction of one rotation by the opposing fixed disk, it is again forcibly dispersed into the plurality of holes of the fixed disk and sent to the rear screw.

If the pitch of the rear screw is made larger than the pitch of the front screw, the difference between the conveying pressure on the front side of the kneading mechanism and the conveying pressure on the rear side can be increased, so that the raw materials can pass through the kneading mechanism smoothly. become.

Further, if the rear screw is eliminated and the distance between the fixed disk and the die is narrowed, the overall length of the screw device can be shortened accordingly.

〔Effect of the invention〕

Therefore, in the pellet extruder according to the first aspect, the raw material is dispersed, kneaded, and dispersed again by the rotating disk and the fixed disk and their cooperation during transportation by the screw, and the kneading is This kneading mechanism uses shear force in a direction perpendicular to the direction in which the raw materials are transported, so this kneading mechanism dramatically improves the uniformity of the blended state of the raw materials compared to conventional methods, resulting in even better quality. In addition to making it possible to obtain pelletized materials, this also eliminates the need for special mixing equipment or processing with variable temperature kneading machines, improving work efficiency. We were able to create a pellet extruder with excellent productivity.

In the pellet extruder according to claim 2, the pellet extruder according to claim 1
In addition to the effect of In addition, it is possible to further improve the uniformity of the blended state.

Also, claim 3. The described pellet extruder is equipped with a mixing and purifying mechanism that can obtain an excellent compounding state, and it is also possible to downsize the pellet extruder and thereby reduce costs. When using low-viscosity raw materials that are not affected by this, it is possible to realize a pellet extruder that is more compact and economical while improving the uniformity of the blending state. .

(Example) Examples of the pellet extruder according to the present invention will be described below with reference to the drawings.

As shown in Figure 4.5, the pellet extruder has a drive section (
1), a raw material supply section (2), and a conveyance extrusion section (3).

The drive unit (1) rotates a screw device (4), which will be described later, which is installed in the conveyance and extrusion unit (3), and includes a motor (M), a continuously variable transmission (5), and a speed reducer (6). It is composed of etc.

As shown in FIG. 7, the raw material supply section (2) temporarily stores the soap stock solution mixed at a predetermined ratio and sent from the stock solution tank (26) in a storage section (23), and then heats it. A vacuum tank (7) is connected to the pre-process of heating with an exchanger (24), and is reduced to a near vacuum (depressurized) by a pump (not shown), and dries the soap stock solution sent through the pre-process. , a leakage part (8) connecting the lower end of the vacuum tank (7) and the transport start end of the transport extruder (3);
It is composed of.

The conveyance extrusion section (3) is composed of a kneading section (9) and a pellet extrusion section (lO), which will be described in detail next.

As shown in FIG.
) is equipped with an extrusion die (11) at the end of the conveyance of a screw device (4) that conveys soap raw materials supplied from It has been set up.

The screw device (4) includes a front screw (13), a rear screw (14), and these front and rear screws (
13), (14) Kneading mechanism (15) provided between
It consists of

As shown in FIG. 2, the kneading mechanism (15) is connected to the conveying end of the front screw (13), rotates integrally with the front screw (13), and has a plurality of kneading mechanisms that penetrate in the axial direction of the screw. a rotating disk (16) with holes formed therein;
A plurality of holes are formed between the rotating disk (16) and the rear screw (14) in the axial direction of the screw, and the screw is fixedly disposed facing the rotating disk (16). and a fixed disk (17). The holes in the fixed disk (17) have a smaller diameter than the holes in the rotating disk (16).

The front screw (13), the rear screw (14), and the cutter (12) are linked together so that they rotate together, and the front screw (13) and the rotating disk (16)
Ki is also connected.

The fixed disk (17) includes a front cylinder (18) that houses a front screw (13), and a rear screw (14).
These cylinders (1B) and (19) are clamped and fixed by the connecting part with the rear cylinder (19) which is installed inside, and the front screw (13) is rotated via the resin bearing (20). I freely support it.

As shown in FIG. 3, the die (11) is clamped and fixed by a rear cylinder (19) and a lid (21) which is pivotally supported to the rear cylinder (19) so as to be openable and closable. At the same time, the rear screw (1) is inserted through the bearing (22).
4) is rotatably supported.

The pitch (Pl) of the front screw (13) is set smaller than the pitch (P2) of the extraction screw (14).

In the figure, (23) is a support for supporting the rear cylinder (19), and (24) and (25) are water channels for cooling, respectively.

In addition, (26) in Fig. 2 is a mesh-like disk network for filtering raw materials, and (27) is a fixed disk (17).
This is a punching plate having a large number of holes smaller than the holes of the disk m (26) to compensate for the strength of the holes in the fixed disk (17).

The kneading section (9) corresponds to the front cylinder (18), and the pellet extrusion section (10) corresponds to the rear cylinder.

The pellet extruder according to the present invention can be used not only for soap raw materials, but also for resin materials such as plastics, foodstuffs, medicines, and the like.

In addition, the front screw (13), the rear screw (14),
The rotary shafts of the cutter and the cutter (12) may be integrally formed.

(Another Embodiment) As shown in FIG. 7, the die (11) may be located near the conveyance side of the fixed disk (17) of the kneading mechanism (15) at the rear end of the front screw (13). .

In this case, there is no rear screw, and instead a compression chamber (25) is formed between the fixed disk (17) and the die (11), and the raw material after passing through the kneading mechanism (15) is transferred to the compression chamber (25). It is temporarily stored while being subjected to the kneading action of dispersion and compression, and is passed through the die (11) by the conveying pressure of the front screw (13).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the pellet extruder according to the present invention, in which FIG. 1 is a longitudinal cross-sectional view of the conveying extrusion section, FIG. 2 is a partial sectional view of the main part, and FIG. 4 is an overall front view, FIG. 5 is a side view of FIG. 4, FIG. 6 is a schematic configuration diagram of the previous process, and FIG. 7 is a longitudinal cross-sectional view of a conveyance extrusion section according to another embodiment.
FIG. 8 is an overall front view of the conventional example. (4)...Screw device, (7)...
・Vacuum tank, (11)... Dice, (12
)...Cutter (13)...Front screw, (14)...Rear screw, (15)
...Mixed taJIa structure, (16) ... Rotating disk, (17) ... Fixed disk.

Claims (1)

[Claims] 1. A screw device (4) that transports the raw material taken out from the vacuum tank (7) to reduce the water content in the stock solution while kneading it, and a screw device (4) at the end of the transport of the screw device (4). A pellet extruder is equipped with an extrusion die (11) and a cutter (12) is disposed on the exit side of the die (11), the screw device (4) comprising:
Consisting of a front screw (13), a rear screw (14), and a kneading mechanism (15) provided between these front and rear screws (13) and (14), the kneading mechanism (15)
is connected to the conveying end of the front screw (13),
A rotating disk (16) that rotates together with the front screw (13) and has a plurality of holes penetrating in the axial direction of the screw, and a connection between the rotating disk (16) and the rear screw (14). A plurality of holes penetrating in the screw axial direction are formed between the rotating disks (
A fixed disk (
17) A pellet extruder comprising: 2. Claim 1, wherein the pitch of the rear screw (14) is larger than the pitch of the front screw (13).
Pellet extruder as described. 3. Claim 1, wherein the rear screw (14) is omitted and the die (11) is arranged near the downstream side of the conveyance side of the kneading mechanism (15). Pellet extruder as described.