JP2011211991A - Extrusion molding apparatus, die, and extrusion molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion molding apparatus that twists foods made of extruded products of various cross-sectional shapes at a target pitch, and a die provided therein.SOLUTION: A die frame 12 having a through hole is detachably attached to the end of an extruder. A core die 11 having an outer circumference in which a bearing 14 is fitted is inserted into the through hole and is freely rotatable. A bearing press 15 is detachably attached to the die frame 12 so that the core die 11 and the bearing 14 are pressed not to come out from the through hole of the die frame 12. The die 10 is formed with a hole 20 and detachably attached to an end part of the core die 11 at the opposite side of the end of the extruder. A raw material flow channel 11a for making a food raw material flow from the end of the extruder to the hole 20 passes through the core die 11. A sealing material 13 is arranged between the end of the extruder and the core die 11 and prevents the food raw material from leaking out from the raw material flow channel 11a. Further a drive motor 30 rotates and drives the die 10 via a belt 31.

Description

  The present invention relates to an extrusion molding apparatus for extruding food, a die provided in the extrusion molding apparatus, and an extrusion molding method of an extrudate extruded from the die.

  In an extruder die for extruding food ingredients, for example, dies for producing pasta have been known for a long time, and when food ingredients are extruded through the holes of the die, they are extruded at each location in the hole. Various shapes of extrudates such as shells and spirals have been shaped by devising the shape of the holes so that the speed (hereinafter referred to as extrusion speed) varies (for example, Patent Document 1).

Prior art field

JP-A-62-029936

  In the die of an extruder for extruding food raw materials, the decomposability and detergency of the die are major problems. When washing is insufficient and even a small amount of food raw material remains, the raw material rots and microorganisms grow easily, which causes food poisoning and the like.

  In terms of degradability and detergency, a die structure for producing pasta that does not have a rotating sliding surface in the die component is simple and excellent. Since the extrudate is bent or twisted using the difference in extrusion speed, the cross-sectional shape of the extrudate is limited. The cross-sectional shape refers to a cross-sectional shape in a direction intersecting with the longitudinal direction of the extrudate. Furthermore, since the twist pitch of the extrudate depends on the difference in extrusion speed, there is a problem that twists at various pitches cannot be added to the extrudate. In addition, the pitch of twist means the space | interval of a peak-to-peak or a valley | valley which is formed when a noodle-like extrudate is twisted.

  In addition, when a new mechanism is added to the die so that twists at various pitches can be imparted to the extrudate, if the added mechanism is complicated, it is difficult to disassemble and clean the die. Furthermore, in order to extrude the food material, it is necessary to devise a die structure so that the extrudate is not contaminated by the wear when the added mechanism moves.

  In the field of resin molding, resin nets made by extrusion molding are known. By rotating a circular die, the warp yarn group and the weft yarn group are welded crossing each other to continuously form one mesh tube. One of the moldings that is often seen is a net that contains fruits such as oranges. However, the shape formed by such a net extrusion die is different from the aim of the present invention and is not a comparison target. In addition, since the inner and outer dies rotate in opposite directions to each other in the net extrusion die, the die structure is complicated and it is difficult to disassemble and clean the die. Furthermore, since the flow path of the extrudate itself rotates and slides, there is a problem that the extrudate may be contaminated with wear on the sliding surface.

  Then, this invention is made | formed in view of the above situations, Comprising: It aims at providing the extrusion molding apparatus and extrusion molding method which can twist an extrudate with the target pitch. A further object is to provide a die structure that is used in the extrusion molding apparatus and the extrusion molding method and that can be easily disassembled and cleaned.

  The present invention relates to an extrusion method for forming a food material into an extrudate having a desired cross-sectional shape by passing the food material through a hole of a die attached to an extruder for extruding the food material. . In the method of the present invention, by rotating a roller pair sandwiching an extrudate extruded from a die hole while rotating the die, the extrudate is rotated at a desired twist pitch between the rotating die and the roller pair. It is characterized by twisting.

Another aspect of the present invention includes an extruder to which a die having a hole is attached, and the food material is pressed into the hole and passed therethrough to form the food material into an extrudate having a desired cross-sectional shape. In the extrusion molding apparatus, the die configured to be rotatable with a rotation shaft in the through direction of the hole, and a pair of rollers that rotate while sandwiching the extrudate extruded from the hole,
It is provided with.

  According to the apparatus of this aspect, the extrudate can be twisted at a desired twist pitch between the rotating die and the roller pair.

  Furthermore, the die provided in the extrusion molding apparatus according to the present invention includes a frame portion, a first rotating body, a pressing portion, a second rotating body, a raw material flow path, and a seal member.

  The frame portion is detachably attached to the extruder. The first rotating body is a rotatable columnar rotating body having a rolling bearing fitted on the outer periphery and inserted together with the rolling bearing in the opening of the frame portion. The pressing portion is detachably attached to the frame portion, and presses the rolling bearing together with the first rotating body so as not to come out of the opening of the frame. The above-mentioned hole is formed in the second rotating body, and the second rotating body is detachably attached to the end of the first rotating body opposite to the extruder side. The raw material flow path is formed through the first rotating body and is a flow path for the food raw material to flow from the extruder to the hole. The sealing material is interposed between the extruder and the first rotating body so that the food raw material does not leak from the raw material flow path.

  According to the die having such a configuration, the second rotating body in which the hole for extruding the food material is formed can be attached to and detached from the first rotating body, and the first rotating body can also be attached to and detached from the frame portion. Therefore, it is very easy to disassemble and clean the dies.

According to the present invention, the extrudate can be twisted at a target pitch. In addition, it is possible to easily disassemble and clean the dies.

Sectional drawing which shows the structure of the die | dye by embodiment of this invention. The front view which looked at the die | dye by embodiment of this invention from the extrudate discharge side. The figure which shows the whole structure of the shaping | molding apparatus provided with the die | dye by embodiment of this invention. The figure which shows the example of the hole shape provided in the die | dye part of die | dye by embodiment of this invention.

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

  FIG. 1 is a sectional view showing the structure of a die according to an embodiment of the present invention, and FIG. 2 is a front view of the die as viewed from the front of the extruder.

  The die according to the present embodiment is used in an extruder for extruding a food material such as a pasta material to obtain an extrudate having a desired shape. This extruder includes a raw material cylinder to which raw material is supplied, a die attached to the raw material discharge side of the raw material cylinder, a rotary shaft screw that is disposed in the raw material cylinder and extrudes the raw material toward the die, have.

  Referring to FIGS. 1 and 2, a die 1 is attached to a die holder 2 located at the tip of the extruder as described above. The die 1 includes a die 10, a core die 11, a frame die 12, a seal material 13, a bearing 14, and a bearing retainer 15.

  A cylindrical frame die 12 is attached to a surface 2 a that opens the raw material outlet of the die holder 2 by mounting bolts 16. A core die 11 as a columnar first rotating body is disposed in a cylindrical hole of the frame die 12, and a bearing 14 as a rolling bearing is mounted on the outer periphery of the core die 11. As a result, the bearing 14 is inserted between the outer periphery of the core die 11 and the inner periphery of the frame die 12, so that the core die 11 can rotate around its central axis inside the frame die 12. It is.

  Further, in order to fix the position of the bearing 14 so that the core die 11 having the bearing 14 assembled on the outer peripheral surface does not move in the central axis direction in the cylindrical hole of the frame die 12, the bearing retainer 15 is attached to the frame die 12. It is attached with mounting bolts 17.

  The surface 2a of the die holder 2 that opens the outlet of the raw material flow path 2c is in contact with the end surface of the core die 11 that corresponds to the surface 2a. The rotatable core die 11 is formed with a raw material flow path 11a passing through its central axis, and this raw material flow path 11a communicates with the raw material flow path 2b on the die holder 2 side. A sealing material 13 such as an O-ring is interposed between the surface 2a and the end surface of the core die 11 in contact with the surface 2a, so that the core die 11 rotates and slides on the surface 2a. The raw material is prevented from leaking from the connecting portion between the raw material flow path 2b and the raw material flow path 11a.

  Further, a disk-shaped die 10 as a second rotating body is attached to the end surface of the core die 11 opposite to the die holder 2 side by a mounting bolt 18 so as to be exchangeable. The die 10 has one or a plurality of holes 20 penetratingly formed in the same direction as the flow direction of the raw material flow path 11 a of the core die 11, and the die 10 is assembled to the core die 11. Thus, all the holes 20 are communicated with the raw material flow path 11 a of the core die 11.

  A driving belt 31 is wound around the outer periphery of the disk-shaped portion of the die 10 and the rotating shaft of the driving motor 30, and the die 10 and the core die 11 are rotated together by the power of the driving motor 30. It has become.

  Although FIG. 2 shows an example in which three holes 20 for extrusion molding are provided in the die 10, the present invention is not limited to the illustrated shape and number.

  4A to 4E show various examples of the shape of the hole 20 of the die 20 for extrusion molding. By changing the hole shape in this way, extrudates having various cross-sectional shapes can be formed. Among these examples, in particular, the hole 20b and the hole 20c are examples in which a core is provided at the center. According to the structure of the hole 20b and the hole 20c, a hollow-shaped extrudate can be formed.

  The extrusion molding apparatus according to the present invention is shown in FIG. 3 in addition to the extruder having the above-described die 1 and rotational drive means such as a drive motor 30 and a drive belt 31 for rotating the die portion of the die 1. In this way, a rotation nip device 41 including a plurality of roller pairs 40 rotating with the extrudate interposed therebetween is provided. Further, a control means (not shown) is provided for controlling the rotational driving means of the die 10 and the roller pair 40 to appropriately change the roller rotational speed of the die roller pair 41 and the rotational speed of the die 10.

  In the above-described extrusion molding apparatus, the food raw material is pressed by the rotation of the screw of the extruder, passes through the raw material flow path 2b of the die holder 2 and the raw material flow path 11a of the core die 11 of the die 1, and enters the hole 20 of the die 10. Inflow.

  While the die 10 is not being rotationally driven, the food material that has flowed into and passed through the hole 20 of the die 10 at a predetermined extrusion pressure of the extruder is extruded as a noodle-like extrudate and is formed into a hole shape of the hole 20. It has a corresponding twist pitch and cross-sectional shape. That is, the extrudate has a constant extrusion rate because the extrusion rate differs depending on the location of the passing material in the hole due to the hole shape when the food material passes through the hole 20, and the difference in the extrusion rate is determined by the hole shape. It has a twist pitch and a cross-sectional shape.

  Subsequently, the extrudate extruded through the three holes 20 (FIG. 2) of the die 10 is drawn between the plurality of roller pairs 40 of the rotary nip device 41 and is fed out by the rotation of each roller pair 41.

  Under such circumstances, when the die 10 is rotationally driven by the rotary motor 30, the noodle-like extrusion extruded from the die 10 at a constant twist pitch between the die 10 and the roller pair 41 located closest to the die 10. A twist is added to an object.

  At this time, the twist pitch of the extrudate can be controlled by the roller rotation speed of the roller pair 41 and the rotation speed of the die 10. For example, if the rotational speed of the die 10 is increased while the roller rotational speed of the roller pair 41 is kept constant, the twist pitch of the extrudate between the die 10 and the roller pair 41 located closest to the die 10 is increased. It gets shorter and slows down.

  According to the extrusion apparatus provided with the die of the present invention as described above, it is possible to easily obtain foods of extruded products having various twist pitches. The obtained food not only has a shape of appearance, but also gives an unprecedented texture in addition to the individual physical properties of the raw material and the physical properties imparted by the shape.

  Further, in the die used for extrusion molding according to the present invention, a portion of the die 10 can be attached to and detached from the core die 11 with a mounting bolt 18, and the portion of the core die 11 is also attached to the die frame 12 with a mounting bolt 17. The die 1 is very easy to disassemble and clean.

[Example 1]
An example of the present application will be given here.

  TEX30-18.5PW-V (manufactured by Nippon Steel Works: Labo Luder) was used as the extruder, and the die 10 provided with φ3 mm × 3 holes 20 was used as the die. As the raw material, commercially available wheat flour (Nisshin Flour Milling: Flower) was used. The extrusion conditions of the extruder were as follows: screw rotation speed: 300 rpm, raw material supply amount: 3 kg / h, water addition amount: 0.4 kg / h, extrudate temperature: 170 ° C., extrusion pressure: 0.5 MPa . The feed rate of the extrudate by the roller pair 41 was set to 6 m / min, slightly faster than the extrusion rate, and the rotational speed of the die 10 was set to 20 rpm. Three extrudates foamed from the die 10, and these became sticking to each other by the steam generated at the time of foaming, resulting in a spiral extrudate in which the three were intertwined.

  In addition, the die 10 provided with φ7 mm × 1 hole 20 was set to the same extruding conditions of the extruder as described above, and to the feed rate of the extrudate and the rotational speed of the die 10 by the same roller pair 41 as described above. In this case, one extrudate extruded from the die 10 could be made into an extrudate having a twist pitch of 2 mm.

1 Die 2 Die holder 10 Die 11 Core die 12 Frame die 13 Sealing material 14 Bearing 15 Bearing retainer 16, 17, 18 Mounting bolt 20 Die hole 20a Die hole a
20b Die hole b
20c Die hole c
20d Die hole d
20e Die hole e
30 Driving motor 31 Driving belt 40 Rotating nip device 41 Nip roll 42 Conveyor

Claims (6)

In an extrusion molding apparatus comprising an extruder having a die formed with holes formed therein, and forcing the food raw material into the hole and passing the food raw material into an extrudate having a desired cross-sectional shape,
The dice configured to be rotatable with a rotation shaft in the through direction of the hole; and
A pair of rollers that rotate across the extrudate extruded from the hole;
An extrusion apparatus characterized by comprising:   2. The extrusion according to claim 1, further comprising control means for controlling the rotational speed of the roller pair and the rotational speed of the die in order to control the twist pitch of the extrudate to a desired pitch. Molding equipment. The dice
A frame part detachably attached to the extruder;
A rolling columnar first rotating body fitted with a rolling bearing on the outer periphery and inserted together with the rolling bearing in the opening of the frame portion;
A pressing part that is detachably attached to the frame part, and that holds the rolling bearing together with the first rotating body so as not to come out of the opening of the frame part;
A second rotator which is detachably attached to an end of the first rotator opposite to the side of the extruder, and in which the hole is formed;
A raw material flow path that is formed through the first rotating body, and the food raw material flows from the extruder to the hole;
A sealing material that is interposed between the extruder and the first rotating body and prevents the food raw material from leaking from the raw material flow path;
The extrusion apparatus according to claim 1 or 2, further comprising: The second rotating body has a disk shape through which the hole is formed, and includes a rotation driving means for driving the second rotating body to rotate.
The said rotation drive means is provided with the drive motor, the rotating shaft of this drive motor, and the drive belt hung around the outer periphery of said 2nd rotary body. Extrusion equipment. A die provided in the extrusion apparatus according to claim 1 or 2,
A frame part detachably attached to the extruder;
A rolling columnar first rotating body fitted with a rolling bearing on the outer periphery and inserted together with the rolling bearing in the opening of the frame portion;
A pressing part that is detachably attached to the frame part, and that holds the rolling bearing together with the first rotating body so as not to come out of the opening of the frame part;
A second rotator which is detachably attached to an end of the first rotator opposite to the side of the extruder, and in which the hole is formed;
A raw material flow path that is formed through the first rotating body, and the food raw material flows from the extruder to the hole;
A sealing material that is interposed between the extruder and the first rotating body and prevents the food raw material from leaking from the raw material flow path;
Dice characterized by having. In an extrusion molding method of forming the food material into an extrudate having a desired cross-sectional shape by pushing the food material through a hole of a die attached to the tip of an extruder for extruding the food material.
The extrudate is twisted at a desired twist pitch between the rotating die and the roller pair by rotating the roller pair sandwiching the extrudate extruded from the hole while rotating the die. An extrusion method characterized by the above.

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