JPH03262471A - Twin-screw extruder and processing method for food or feed using same - Google Patents

Abstract

PURPOSE:To efficiently perform the processing of food or feed by regulating the gap between the flange of a gear box and the flange of a barrel to alter the space between the cap at the tip of a screw and a die plate. CONSTITUTION:The gap between the flange 2a of a gear box 2 and the flange 5b of a battel 5 are regulated through a stopper bolt 10. Thereby, the space between the cap 12 at the tip of a screw and a die plate 7 is altered, and a raw material is kneaded and heated, thus obtaining the objective processed food.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a twin-screw extruder for carrying out a method of processing food and feed using a twin-screw extruder, as well as an improved method.

Conventional technology In recent years, it has become possible to efficiently process high-quality foods and feeds using a twin-screw extruder, but further research has been conducted to optimize the size, density, and degree of gelatinization of the product for each food. ing. These variable factors include raw material composition,
Added water amount, feed amount.

Barrel temperature setting, screw combination, screw rotation speed, tip screw cap shape, die shape, etc. can be mentioned. Various conditions suitable for the raw materials are selected in advance based on the product in mind, and the process is carried out.However, it is often the case that the product does not turn out as expected and it is necessary to change the conditions. Among the above factors, those that can be changed during operation include raw material blending, feed amount, etc. using two or more feed devices.
These are the amount of water added, the barrel temperature setting, and the screw rotation speed.

The composition of raw materials cannot be freely changed from the economical or nutritional standpoint of the product. The temperature setting of the barrel and the amount of water added are determined from sterilization and hygiene aspects such as preservability, destruction of vitamins,
There is a limit to the range of processing due to the digestibility and nutritional aspects of not being crushed.

In addition, the screw rotation speed and filling amount are effective to the extent that they can be used to adjust the residence time of the raw material in the barrel, adjust the pressure at the tip by changing the size of the die, etc., but are not fully satisfactory operational factors.

Problems to be Solved by the Invention Although there are factors that can be changed during operation, there are many restrictions on these factors, and if the desired product cannot be obtained,
Each time, we had to stop the machine and change the conditions at the tip of the two-screw extruder, which has the highest response, by rearranging the screw segments, replacing the die, or replacing the cap at the tip of the screw. For this reason, there was a problem in that it required a considerable amount of time and effort to deal with the problem, production efficiency decreased due to the stoppage of operation, and replacement parts had to be prepared.

The present invention was developed in view of the above-mentioned problems of the conventional technology, and its purpose is to continuously change the physical properties of a product during operation without stopping the machine to achieve the intended purpose. It is an object of the present invention to provide a processing method for processing a product and a two-axis extruder for carrying out the processing method.

Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention continuously changes the physical properties of the extruded product by changing the space between the die plate and the webbing at the tip of the screw during operation. In addition, two screws each have a cap attached to their tips, a die plate that faces the caps, and the die plate is attached to the tip by fitting the two screws into the center hole and attaching the shaft. The present invention is a two-shaft extruder including a barrel whose position can be adjusted in a direction, and means for moving and positioning the barrel.

The raw material fed into the working barrel is heated, pressurized and kneaded by two screws, and then sent out from the die on the tip side. During operation, the barrel is moved in the axial direction within a range of about 10 m by the moving positioning means to adjust the space at the tip of the cap and to reduce the pressure at the tip.

Changes in the reaction are controlled by adjusting the amount of raw material charged and the rate at which the raw material passes.

Example The present invention will be explained below based on FIGS. 1 to 3.

For example, in a two-shaft extruder, a plurality of barrels 5 are connected together in a line on the same axis and installed horizontally on an underframe L. A book shaft is inserted through the shaft and rotated at a predetermined speed by a gear box 2 driven by a motor (not shown). A feed screw, a reverse screw nudging disk, etc. 8 are appropriately selected and inserted and mounted on this shaft, respectively. Into the first barrel 5, the raw material put into the hopper 3 is fed through the inlet 5a by the feeding device 4, and an appropriate amount of water or hot water regulated by a metering pump (not shown) is fed through the water inlet 6. Each barrel 5 is equipped with a heating device for heating and a cooling device for cooling, as well as a thermometer and a pressure gauge as appropriate and centrally controlled by a control device. On the exit side of the last barrel 5, a goo plate 7 with one or two holes bored in the axial direction is attached, and a cutter rotated by a motor is installed on the front surface of the goui plate 7.

And what should be especially noted is that the barrel 5 is gearbox 2.
The integral barrel 5 is approximately 1° in the axial direction on the bracket la on the underframe 1.
It is configured to be movable by about n. At least two hydraulic flanges 9 are centrally symmetrically provided on the end face of the flange 2a of the gear box 2, and the ends of the piston rods are connected to the flange 5b of the barrel 5.

Further, a stop bolt 10 having a flange 10a with a scale engraved on the surface of the flange 2a of the gear box 2 is screwed on, and the tip thereof is in contact with the end face of the flange 5b of the barrel 5, and a reference scale Vj is attached to the flange 2a. The gap d1 between the flanges 2a and 5b can be confirmed by the reference line ll. Note that screw 8 is used instead of gap d1.
It is convenient to have a scale engraved to represent the gap d2 between the cap 12, which is removably attached to the tip of the die plate 7. Further, instead of the stopper bolt, it is also possible to use a motor to rotate a screw that is rotatably supported on the flange 2a and screwed onto the flange 5b, and in this case, the hydraulic cylinder can be omitted.

In this structure, the stopper bolt 1
0 is adjusted so that d1 in the gap between the flanges 2a and 5b is 1/2 of the adjusted amount, and the hydraulic cylinder 9 is activated to draw the barrel 5 toward the gear box 2 side. Raw materials mixed to suit the product are charged into the hopper 3, and fed through the input port 5a of the barrel 5 by the feeding device 4.The raw materials are crushed, mixed, kneaded, and shredded in the barrel by two screws 8. , heating 5, sterilization, compression, cooling, etc., and then extruded from the opening of the die plate 7. If the product that has gone through these steps does not reach the desired quality and is not satisfactory, the gap d1, that is, the gap d2, will be adjusted. Gap d
By changing 2 (space), the pressure at the tip of the screw, the filling amount of the raw material, and the moving speed of the raw material can be adjusted. 5 is fixed, the product condition is confirmed, and this adjustment and confirmation is repeated to select the position that provides the optimum condition.

In this embodiment, the easiest method of moving the barrel having a smooth inner surface was adopted, but it is of course possible to use a method of moving the gouly plate or the screw shaft during operation.

An experimental example in which the gap d2 was changed using the α-100-E-12 type two-axis extruder (manufactured by Suehiro Iron Works) modified to the above-mentioned structure is as follows.

Jl Avoidance L ○Purpose Adjustment of puffiness of snack dough ○Conditions/Ingredients Amount of all-purpose flour feet 40/hr ○Result Amount of added water 34! /hr Barrel temperature 60℃ Screw rotation speed 150r, p, m.

Die diameter φ4fl x 1 hole x 2 pieces ○Results Screw rotation speed: 13 Or, p, m.

Die diameter φ5n x 1 hole x 2 pieces It was possible to change the degree of swelling.

JULL ○Purpose O condition for low moisture Mi weaving of dry meat-like meat.
Raw materials Powdered okara, defatted soy flour, wheat flour 1 potato starch Feed amount 60 kg/hr Added water amount 'l Q 1/hr Barrel temperature 180°C When the gap d2 between the cap and the die is large, the product will be lever-shaped. As the material becomes narrower, the flow speed of the material becomes faster and fine fibers run through it, and when it is returned to water, the meat becomes good, like crab legs or chicken meat.

iL avoidance ○Purpose Sorted meat-like organization○Conditions Raw material Defatted soybean flour feed amount 10 dazzles/hr Added water amount 201/hr Barrel temperature
160℃ Screw rotation speed 100r, p, s.

Die Cooling die used ○Result By narrowing the gap d2 between the cap and the die, the flow rate of the material became faster and finer fibers were able to run.

Effects of the Invention The present invention has the following effects by using the method and configured apparatus as described above.

Since the gap between the cap and the die plate can be changed continuously during operation, the degree of swelling and the quality of the swelling (the fineness of the pores) can be controlled. In addition, the heat exchange efficiency is improved, which makes it possible to perform low-temperature processing, ensuring a comprehensive heat capacity, and making it possible to control cooking by heating.

Furthermore, the fiber direction and fiber strength can be controlled. Furthermore, since the period during adjustment is increased, even when the operating condition is unstable, it is possible to maintain a good operating condition. The filling amount of the material is then adjusted, making the kneading function of the screw more efficient. Furthermore, the pressure stability during extrusion is improved without changing the hole of the die. For these reasons, the time required for product quality adjustment is increased with one die, and the best product can be produced under the most suitable conditions.

[Brief explanation of drawings]

Fig. 1 is an external view of the two-shaft Uxtruder, Fig. 2 is an enlarged view of the barrel position adjustment section, and Fig. 3 is a cross-sectional explanatory view of the barrel tip. 2. Gear box 5. Barrel 7. Die plate 8. Screw 9. Hydraulic cylinder 10. Stomba bolt 12. Cap

Claims (2)

[Claims] (1) A twin-screw extruder and a food and feed processing method using the same, characterized in that the physical properties of an extruded product can be continuously varied by changing the space between the die plate and the cap at the tip of the screw during operation. (2) Two screws with caps attached to their tips, a die plate facing the caps, and the die plate attached to the tips, fitting the two screws into the center hole and positioning them in the axial direction. A two-shaft extruder comprising an adjustable barrel and means for moving and positioning the barrel, the size of the space at the tip of the cap being variable during operation.