JPH084487B2 - Discharge method and device for twin-screw extruder - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for discharging a twin-screw extruder and an apparatus therefor, and more particularly, to a long die for cooling raw materials having high water content such as seafood and high oil and fat content such as soybeans. When processing with the equipped twin-screw extruder, the pressure inside the twin-screw extruder is controlled by adjusting the rotational speed of the pump between the twin-screw extruder and the cooling long die to cool the workpiece. The present invention relates to a discharge method and apparatus for a twin-screw extruder that discharges more continuously and stably.

Conventional technology For example, as a food processing machine, a twin-screw extruder has a higher degree of freedom in terms of operating conditions and raw material characteristics for processing, compared to a single-screw extruder. It has been attracting attention because it can be replaced and it can process raw materials including raw materials having high water content and high oil and fat content.

The reason for this is that the twin-screw extruder has the function of simultaneously performing temperature treatment and mechanical treatment. That is, both the ability to process steps such as transfer, compression, mixing, crushing, kneading, shearing, heating, sterilization, expansion, and molding in one device in a short time and the ability to control the texture and texture of the product. This is because we also have them.
For example, a biaxial extruder is used in the case where a fish meat paste and additives are processed and organized to produce a new meat-like food product. This extruder consists of a feeder, barrel, screw, die, heater, and cooling unit.When raw materials such as fish meat are fed from a feeder to a twin-screw extruder, these raw materials are fed by a rotating screw while the barrel and heater are fed. After being subjected to treatments such as compression, kneading, and heating in the inside, it is discharged from a die in various shapes such as a round bar shape to obtain a structured product.

To further explain this twin-screw extruder,
As shown in FIG. 2, in the barrel 1 of the twin-screw extruder, one screw 2 which is engaged with each other and rotates in the coaxial direction is arranged, and at its tip, a screw nut 16 is provided in the vicinity of the barrel die 3 to form the barrel 1. The raw material is discharged from the barrel die 3 through the gap between the fukuro nut 16 and the barrel die 3 when the raw materials are kneaded, compressed, heated, cooled, and the like by the two screws 2. Therefore, when the object to be processed is cooled in the vicinity of the barrel die 3, clogging or the like occurs in the die, and as a result, the pressure in the twin-screw extruder fluctuates and the object to be processed is not continuously discharged, resulting in intermittent discharge. There is a problem in that the discharge amount cannot be controlled because the discharge amount may be explosively ejected and sometimes explosively ejected to flash.

In addition, when processing high-moisture or high-fat raw materials with a twin-screw extruder, if the work-piece discharged from the twin-screw extruder is rapidly cooled, the work-piece flashes. There is proposed a method in which a cooling long die is provided at the tip of the to slowly cool.

However, in this method, the contact resistance changes depending on the shape, length, etc. of the cooling long die in which the object to be treated is gradually cooled in the cooling long die, and the pressure inside the twin-screw extruder constantly fluctuates, and There is a problem in that a predetermined amount cannot be discharged continuously and stably, and the quality of the ink also varies greatly.

As a method for solving such a problem, for example, it has been proposed to attach a breaker plate or the like in front of a cooling long die to suppress the pressure fluctuation in the biaxial extruder. However, even with this method, it is difficult to sufficiently suppress the pressure fluctuation in the twin-screw extruder and it cannot be said that the method is always satisfactory.

In summary, as described above, in the conventional example, research and development of a new product in which a raw material such as high water content or high fat content is processed under high temperature and high pressure by a twin-screw extruder equipped with a cooling long die has been conducted. As a method of preventing the pressure fluctuation in the extruder, only providing a breaker plate before the cooling long die has been proposed.

For this reason, a discharging method of a twin-screw extruder that stably discharges an object to be treated with a twin-screw extruder equipped with a cooling long nozzle so that a textured product is obtained by processing a raw material such as high water content or high oil and fat content. As for the and its equipment, the completed one has not been proposed yet.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention aims to solve the above problems, and specifically, to control the pressure fluctuation inside a twin-screw extruder by using a raw material such as high water content such as seafood or high oil and fat content such as soybean. However, it is an object of the present invention to provide a discharging method and a discharging device capable of continuously and stably discharging an object to be processed from a cooling long die.

Means for Solving the Problem and Its Action That is, the present invention is provided between the extruder and the cooling long die when discharging the object processed in the twin-screw extruder from the cooling long die. A pump for sucking and pressure-feeding the object to be processed is provided, the rotation speed of the pump is adjusted, the pressure inside the extruder is controlled, and the amount of the object to be processed to be pressure-fed is kept constant to continuously and stably from the cooling long die. Characterized by discharging
Further, the invention is characterized by comprising a twin-screw extruder, a pump for sucking and pressure-feeding the treatment object of the twin-screw extruder, and a cooling long die for cooling the treatment object pressure-fed by the pump.

Then, the means constituting the present invention and the operation thereof will be further described as follows.

The present inventors process raw materials such as high water content or high oil and fat content with a twin-screw extruder equipped with a cooling long die, and slowly cool the resulting object to be processed with a cooling long die to form a cooling long die. Focusing on the fact that the contact resistance between the cooling long die and the object to be processed changes because it is long and the object to be processed is gradually cooled with cooling water, etc., and the operating conditions suitable for this were determined. I found it necessary to meet.

(1) The amount of the object to be processed in the twin-screw extruder processing device can be adjusted so that a predetermined amount is always present. (2) The object to be phase-shifted from the discharge port of the twin-screw extruder can be easily transferred and pressure-fed. To be able to adjust the amount, etc.

Therefore, research was conducted on such conditions, and the present invention was established based on this research.

 The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an essential part of one device of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional device.

Reference numeral 1 is a barrel, 2 is a screw, 3 is a barrel die,
4 is a pump, 5 is a cooling long die, 6 is a water supply port, 6 is cooling water, 7 is cooling water, 8 is a drain port, 9 is a discharge port, 10 is a coupling nozzle, 11 is a barrel die nozzle, 12 is a barrel die discharge port, and 13 is a suction port. , 14 is a pressure feeding port, 15 is a cooling long die inlet, and 16 is a fukuro nut.

First, the apparatus used for carrying out the present invention shown in FIG. 1 has a structure in which a pump 4 is provided between a barrel 1 and a cooling long die 5. The barrel 1 has a structure having two screws 2 inside and a barrel die 3 at the end, and the screw 2 has a conical tip part that meshes with each other and rotates coaxially. It has a structure in which the tip portion is partially projected from the barrel. The barrel die 3 has a structure in which the barrel covers the tip of the conical screw 2 at the end of the barrel 1 and has a gap for forming a nozzle. The pump 4 is not particularly limited as long as it is a pump that sucks the object to be processed discharged from the barrel 1 and pressure-feeds it, and for example, a gear pump including two rotating gears can be used. Barrel 1 and pump 4 are barrel die discharge ports at the tip of barrel die nozzle 11 of barrel 1.
12 and a suction port 13 of the pump 4 are connected via a coupling nozzle 10, and the coupling nozzle 10 is a tubular body capable of sucking the object to be treated discharged from the discharge port 12 of the barrel die by the pump 4. The cooling long die 5 has a structure in which the periphery of the die is cooled by cooling water 7. The cooling water 7 is introduced from the vicinity of the discharge port 9 of the cooling long die 5 and drained from the drain port 8. The cooling long die 5 and the pump 4 are connected by a pipe to a pressure feed port 14 for feeding the object to be processed from the pump 4 and a cooling long die inlet 15.

By means of the device composed of the barrel 1 of the twin-screw extruder, the pump 4 and the cooling long die 5 described above, for example, high water-containing or oil-rich food materials and additives are supplied into the barrel of the twin-screw extruder. When the two screws 2 are rotated, they are sequentially processed and sent to the tip end, and are discharged from the barrel die 3 to the joining nozzle 10 at the joint between the barrel die 3 and the pump 4. On the other hand, when the pump 4 is operated, the object to be treated in the coupling nozzle 10 is sucked by the pump 4, introduced into the pump 4 and pressurized by the pump 4, continuously fed while being pumped to the cooling long die 5 and cooled. Is discharged from the discharge port 9.

In this case, when the pressure in the barrel 1 is high, the rotation speed of the pump 4 is increased to increase the discharge amount, while when the pressure is low, the rotation speed of the pump 4 is decreased to decrease the discharge amount. The internal pressure of the cooling long die 5 can be freely controlled by adjusting the rotation speed.

By adjusting the number of rotations of the pump in this way, it is possible to prevent clogging and bumping of the object to be processed in the barrel die, and even if the contact resistance between the cooling long die 5 and the object to be processed changes, it is pumped by the pressure of the pump. Therefore, the object to be processed can be stably and continuously discharged without being affected by the contact resistance or the like.

Example Using the apparatus according to the present invention shown in FIG. 1, soybean protein was used as a raw material, and an organization test was conducted under the following conditions.

(A) Twin-screw extruder Suehiro Iron Works α-50 type Raw material supply amount 20kg / h Barrel temperature 140 ℃ Screw rotation speed 150rpm (B) Pump Daikire Industry Co., Ltd. Gear pump rotation speed 30rpm ～ 300rpm (C) Cooling long die length As a result, the object to be treated was stably discharged in an amount commensurate with the supply amount of the raw material, and the shape and quality of the obtained structured product were excellent.

<Effects of the Invention> As described in detail above, the present invention provides the above-mentioned structure provided between the extruder and the cooling long die when discharging the object processed in the twin-screw extruder from the cooling long die. It is a method for controlling the pressure inside the extruder by adjusting the rotational speed of a pump that sucks and pressure-feeds the object to be processed, and is a method for continuously and stably discharging the object from a cooling long die. Further, the present invention is characterized by comprising a twin-screw extruder, a pump that sucks and pressure-feeds an object to be treated by the twin-screw extruder, and a cooling long die that cools the object to be treated that is pressure-fed from the pump.

Therefore, since the apparatus used for carrying out the method of the present invention has the pump attached to the twin-screw extruder through the coupling nozzle before the cooling long die, it is possible to process in the twin-screw extruder by operating the pump. The processed material is sucked by the pump and pumped into the cooling long die.By adjusting the rotation speed of the pump, the pressure in the twin-screw extruder can be freely controlled regardless of the contact resistance of the cooling long die. In addition, it is possible to transfer the object to be processed with a constant pumping amount. Therefore, the structuring of the object to be processed can be continuously and stably discharged from the cooling long die, and the quality of the structured product of the object to be processed can be obtained.

Further, since the apparatus of the present invention has a simple structure in which a pump for sucking and feeding the object to be processed is provided between the twin-screw extruder and the cooling long die, it is easy to operate, This is an epoch-making product in which a predetermined amount of discharge is stably obtained from a cooling long die.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of one device of an embodiment of the present invention, and FIG. 2 is an explanatory view of a conventional device. Reference numeral 1 ... Barrel, 2 ... Screw, 3 ... Barrel die, 4 ... Pump, 5 ... Cooling long die, 6 ... Water supply port, 7 ... Cooling water, 8 ... Drainage port, 9 ... Discharge port ,Ten…
… Coupling nozzle, 11 …… Barrel die nozzle, 12 …… Barrel die discharge port, 13 …… Suction port, 14 …… Pressure feed port, 15 …… Cooling long die inlet, 16 …… Fuco nut

Claims (2)

[Claims] 1. A pump for sucking and pressure-feeding the object to be processed, which is provided between the extruder and the cooling long die, when the object to be processed processed in the twin-screw extruder is discharged from a cooling long die. A method for discharging a twin-screw extruder, characterized in that the number of revolutions is adjusted, the pressure inside the extruder is controlled, the amount of the object to be processed is kept constant, and the object is continuously and stably discharged from a cooling long die. 2. A biaxial extruder comprising a biaxial extruder, a pump for sucking and pressure-feeding an object to be treated by the biaxial extruder, and a cooling long die for cooling the object to be pressure-fed from the pump. Extruder processing equipment.