JPH05292933A - Method for washing cylinder and die of twin-screw extruder for food and its apparatus - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a method and an apparatus for cleaning a cylinder and a die of a twin-screw extruder for food, and in particular, after the operation, high-pressure water is supplied to the cylinder and the die through a nozzle for automatic cleaning. It is characterized by According to the method and apparatus for cleaning a cylinder and a die of a twin-screw extruder for food according to the present invention, the inside of the cylinder (2) and the die (11) are cleaned with pressurized water while the screw (4) is rotated. It is a composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning a cylinder and a die of a twin-screw extruder for food, and more particularly, to supplying pressurized water to the cylinder and the die through a nozzle after the operation.
A new improvement for automatic cleaning.

[0002]

2. Description of the Related Art Conventionally, as a cylinder of a twin-screw extruder of this type, in order to facilitate cleaning of a screw and a cylinder,
A type in which a cylinder is divided, a type in which a screw shaft is pulled out, a type in which a cylinder is pulled out, etc. are well known. Also,
A two-shaft screw shaft is also used in which the clearance between the screws is made small so that the materials can be scraped from each other while having a self-cleaning action.
Generally, when cleaning after operating a twin-screw extruder, heating of the cylinder temperature is switched to cooling, the amount of water is gradually increased while gradually reducing the amount of raw material supply, and the raw material viscosity is softened, resulting in die clogging. It is important to stop it so that it does not exist. After that, the cylinder, the screw and the die are disassembled and manually washed. In this case, the raw material adhering to the inner wall of the cylinder is dropped by a wire brush or the like, the screw or screw segment is immersed in water, and then scraped by a scraper or the like. Also, the clogged die holes were made with awls or a screwdriver, and when they were cleaned, they had to be reassembled several times to restart.

[0003]

Since the conventional method for cleaning the cylinder and die of the twin-screw extruder for food has the above-described structure, the following problems exist. In other words, a twin-screw extruder is one in which raw materials are mixed and kneaded by a screw and extruded from a die.However, when operation is stopped and the cylinder inner wall and screw part are observed, the film-shaped raw material adheres to the cylinder inner wall. However, it is confirmed that the raw material adheres to the screw despite the self-cleaning action. In addition, since water is added to the inside of the die in an increased amount when the extruder is stopped, a water flow path is formed, and all the parts except the flow path are in a clogged state, and most of the die holes are clogged. In such a state, it may not be possible to drive due to clogging even if an attempt is made to restart the vehicle immediately. For example, even if the operation can be performed, if the stopping time is long, it is not preferable from the viewpoint of food hygiene because the raw materials adhere to the inside of the cylinder and the die. Further, when the post-process is a batch type and when intermittent operation is required, the extruder is stopped many times, and the cylinder, screw and die are disassembled, washed, and assembled, No matter how much labor was required, it was impossible to reduce the process even further. In addition, since the cleaning work is repeated, even if sufficient cleaning is performed, if some raw material remains,
The taste and aroma may change subtly when restarted, which is not preferable for quality control. In particular, when kneading and extruding cocoa, chopsticks, and other fats and oils for flavors, which are used as flavors, unless perfect cleaning is performed, it is not possible to maintain a consistent quality and manage food quality. However, it was impossible to improve further with the current methods such as shortening the process and quality control.

The present invention has been made in order to solve the above problems, and in particular, it is for foods which is automatically washed by supplying pressurized water to a cylinder and a die through a nozzle after operation. An object of the present invention is to provide a method and an apparatus for cleaning a cylinder and a die of a twin-screw extruder.

[0005]

A method of cleaning a cylinder and a die of a food extruder according to the present invention comprises a die plate in which a raw material kneaded by a pair of screws in a cylinder having a raw material inlet is horizontally arranged in the die. In a method for cleaning a cylinder and a die of a twin screw extruder for food to be extruded through, supplying pressure water into the cylinder from the upstream side of the cylinder under a state in which each screw is rotated, and,
It is a method of supplying pressurized water to the inside of the die.

More specifically, the pressured water is a method comprising water, hot water or steam.

A cylinder and die cleaning apparatus for a twin-screw extruder for food according to the present invention extrudes a raw material kneaded by a pair of screws in a cylinder having a raw material inlet through a die plate horizontally arranged on the die. In a cleaning device for a cylinder and a die of a twin-screw extruder for food, the first nozzle provided on the upstream side of the cylinder, the second nozzle and the third nozzle provided on the die, and each of the nozzles And a pressure water supply device for supplying pressure water, and is configured to clean the cylinder and the die with the pressure water from each of the nozzles.

More specifically, the second nozzle and the third nozzle
The nozzles are arranged in directions substantially orthogonal to each other, and a check valve is provided in each of the nozzles.

[0009]

In the method and apparatus for cleaning the cylinder and die of the twin-screw extruder for food according to the present invention, the pressure water is jetted into the cylinder from the jet nozzle at the upstream portion of the cylinder while rotating the screw, and The raw material adhering to the screw is scraped off by the screw or dissolved by pressure water, and is sent to the die at the downstream part while being washed. In addition, by injecting pressure water in the direction of the die plate below the injection nozzle above the die, the die holes are cleaned, the pressure water in which the raw material is dissolved is released through the die holes, and the pressure water that bounces back inside the die. Are washed. Furthermore, by spraying pressured water horizontally from the jet nozzle at the tip of the die to the tip of the screw, the tip of the screw and the end face are cleaned. The injection from each of the injection nozzles is alternately repeated a plurality of times while changing the type of pressure water, so that the cylinder, the screw and the die can be completely washed and the raw material can be discharged.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a method and apparatus for cleaning a cylinder and a die of a twin-screw extruder for food according to the present invention will be described in detail below with reference to the drawings. 1 to 4 show a cylinder and die cleaning apparatus of a twin-screw extruder for food according to the present invention. FIG. 1 is a configuration diagram, FIG. 2 is an enlarged cross-sectional view of an essential part of FIG. 1, and FIG. 1 is an enlarged sectional view of the die part of FIG. 1, and FIG. 4 is FIG.
FIG. 3 is an enlarged cross-sectional view of a raw material charging port portion of FIG.

1 to 4 is a twin-screw extruder for food having a cylinder 2 and a feeder 3, and a pair of screws 4 are rotatably provided in the cylinder 2. At the same time, a raw material inlet 5 is formed on the upstream side 2a of the cylinder 2. The raw material charging port 5 is provided with a lid 7 that can be opened and closed via a screw body 6 that can be screwed into the cylinder 2. The upstream side 2a of the cylinder 2 has a first check valve 8. One nozzle 9 is provided.

On the downstream side 2b of the cylinder 2, a die 11 having a die plate 10 having a die hole 10a is horizontally arranged, and an upper wall 11 of the die 11 is provided.
A second nozzle 13 having a second check valve 12 is provided at a so as to be capable of injecting toward the lower die plate 10, and a third check valve 14 is provided at a tip wall 11b thereof.
The nozzle 15 is provided so as to be capable of injecting in the downstream side 2b direction of the cylinder 7, and the injection directions of the nozzles 13 and 15 are arranged so as to be substantially orthogonal to each other.

The first nozzle 9 is connected via a first pipe 19 to a second switching valve 18 connected to a pressure water supply device 17 having a first valve 16 for pressure adjustment. The third valve 20 for switching, to which the third nozzles 13 and 15 are connected, is the second valve 1 via the second pipe 21.
8 is connected. Furthermore, the first pipe 19 and the second nozzle 13 are connected via a fourth valve 22.

Next, a case where the cylinder 2 and the die 11 are actually cleaned in the above-mentioned structure will be described.
The twin-screw extruder 1 for food is TEX5 manufactured by the present applicant.
2FSS-23AW type was used. An example of extrusion is
A 1: 1 mixture of cocoa powder and water as various food additives was kneaded and extruded, and the cylinder 2 was not heated but only cooled. Each screw 4 is a ball-type screw that has a self-cleaning action in the forward direction, and while rotating in the same direction at 500 rpm, the feeder 3
More cocoa was supplied in a constant amount of 100 kg / h. In addition, 100 l / h of water was simultaneously charged from the water addition port 1c. Die 1
1 is a detachable type in which the die plate 10 is horizontally arranged and attached so that φ3 × 8 holes can be extruded downward, and a string-shaped kneaded product can be extruded downward.

After operating for 30 minutes in this state, the extruder 1 is brought to a stopped state, so that the supply of cocoa is gradually reduced, and when it is confirmed that the cocoa is extruded in a substantially water state, the feeder 3 is stopped. Let At this time, when the cylinder 2 is washed, the screw 6
The raw material charging port 5 was sealed with a lid 7 having a lid. Next, the screw rotation speed was reduced to 200 rpm, and the pressure water supply device 17 (B-200 type high pressure washer manufactured by Shinsho Co., Ltd.) was operated from this operating state. This pressure water supply device 17 has a pressure of 160 to 200 kg / cm ² and a water amount of 13 to 15 l / mi.
n, hot water temperature 85 to 88 ° C, steam temperature 120 ° C (5
0 kg / cm ² ) is possible. First, hot water or steam is generated, the pressure is set to 30 to 50 kg / cm ² by the first valve 16 for pressure adjustment, and the second valve 1 is used to remove the clogging part of the die plate 10.
8 to the second pipe 21 and the third valve 20
Is opened to the second nozzle 13, and the second nozzle 1 with the second check valve 12 is provided from the upper part of the die 11 toward the die plate 10.
Hot water or steam was sprayed from No. 3 for about 1 minute. Then, in order to wash the tip 4a of the screw 4, the third valve 20 is switched to open to the third nozzle 15, and the tip wall 11b of the die 11 is moved toward the downstream side 2b of the cylinder 2, that is, the tip 4a of the screw 4. Hot water or steam was sprayed from the third nozzle 15 with the third check valve 14 for about 30 seconds. In this state, the raw material remaining inside the die 11 was blown off and became a molten state, and was washed away without clogging.

Next, the water injected from the water addition port 1c is stopped, the second valve 18 is switched to the first pipe 19, and hot water is jetted from the first nozzle 9 with the first check valve 8 for about 3 minutes. did. The first nozzle 9 may be any upstream side 2a of the cylinder 2, and can be attached to the raw material inlet 5 or the cylinder 2 at a place where a complicated screw is incorporated.
It is also possible to attach to. By repeating the process of injecting steam or hot water to the die 11 and the cylinder 2 about 3 to 5 times, there is no raw material inside,
A perfect wash was done.

Further, by opening the fourth valve 22 with the second valve 18 opened to the first pipe 19, pressure water is simultaneously jetted from the nozzles 9 and 13 to wash the cylinder 2 and the die 11 at the same time. Is also possible. Further, when the raw material contains a large amount of oil and fat, an oil film may be formed on the inner walls of the screw 4 and the cylinder 2, but it is preferable to add a small amount of detergent to water or warm water for cleaning. Further, if the washing is finished only with warm water or steam, the temperature of the screw 4, the cylinder 2 and the die 11 will rise considerably, so that it is important to flush the water at the end. Each of the nozzles 9, 13, 1
No. 5 is equipped even during the normal operation of the food twin-screw extruder 1 for extruding raw materials, but during the normal operation of the food twin-screw extruder 1, high pressure is generated in the cylinder 2 and the die 11. Therefore, the raw material may flow backward from the nozzles 9, 13, 15 to the first pipe 19 or the second pipe 21, and each pipe 19,
21 may be clogged. Therefore, each nozzle 9,1
Nozzles 9, 13 and 15 are connected to pipes 3 and 2 by pipes 3 and 15.
Check valves 8, 12, 1 to prevent the inflow of raw material into 1
4 are provided respectively. Although a commercially available high-pressure washing machine was used in the above-mentioned examples, sufficient washing can be performed if the pressure of the pressure water is about the pressure of tap water or higher. In addition, the pressure water supply device 17 and the nozzles 9, 13, and 15 described above are controlled by a program by an automatic controller (not shown), so that cleaning can be performed by a completely automatic remote operation.

[0018]

EFFECTS OF THE INVENTION By rotating a screw of an extruder and injecting high pressure (water, hot water, steam) to a cylinder and a die, it is possible to perform a cleaning operation by remote operation without disassembling the cylinder and the die as in the conventional case. can do. In addition, since all the devices can be automatically operated by using program control, it is possible to safely and automate, and it becomes possible to save labor and shorten the process. Also, in terms of food hygiene, by passing high-pressure hot water or high-pressure steam after or before operation, a sterilizing effect can be expected and quality control can be performed at the same time.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a cleaning device for a cylinder and a die of a twin screw extruder for food according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of FIG.

FIG. 3 is an enlarged cross-sectional view showing a downstream side of the cylinder of FIG.

FIG. 4 is an enlarged cross-sectional view showing an upstream side of the cylinder of FIG.

[Explanation of symbols]

 1 Twin screw extruder for food 2 Cylinder 2a Upstream side 4 Screw 5 Raw material inlet 8, 12, 14 Check valve 10 Die plate 11 Die 17 Pressure water supply device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B29C 33/72 8927-4F 47/08 7717-4F

Claims (4)

[Claims] 1. A raw material kneaded by a pair of screws (4) in a cylinder (2) having a raw material inlet (5) is extruded through a die plate (10) in which a die (11) is horizontally arranged. In the method of cleaning the cylinder and die of the twin screw extruder for food (1), the cylinder (2) from the upstream side (2a) of the cylinder (2) under the condition that each screw (4) is rotated. A method for cleaning a cylinder and a die of a twin-screw extruder for food, characterized in that pressurized water is supplied to the inside of the die and the pressurized water is supplied to the inside of the die (11). 2. The method for cleaning a cylinder and a die of a twin-screw extruder for food according to claim 1, wherein the pressurized water is any one of water, hot water and steam. 3. A raw material kneaded by a pair of screws (4) in a cylinder (2) having a raw material inlet (5) is extruded through a die plate (10) horizontally arranged on a die (11). In a cleaning device for a cylinder and a die of a twin-screw extruder for food (1), the first nozzle (9) provided on the upstream side (2a) of the cylinder (2) and the die (11) are provided. Second nozzle
(13) and a third nozzle (15), and a pressure water supply device (17) connected to each of the nozzles (9, 13, 15) for supplying pressure water. A device for cleaning a cylinder and a die of a twin-screw extruder for foods, characterized in that the cylinder (2) and the die (11) are cleaned by pressure water from the nozzles (15, 15). 4. The second nozzle (13) and the third nozzle (15)
Are arranged in directions substantially orthogonal to each other, and each of the nozzles is
The cleaning device for cylinders and dies of a twin-screw extruder for foods according to claim 3, characterized in that the check valves (8, 12, 14) are provided in the (9, 13, 15). ..