JPS62232369A - Die for food extruder - Google Patents

Abstract

PURPOSE:To enable extrusion molding of a food having a definite center hole, by using a screw rotatable in a cylindrical barrel, attaching a die part having an inner mandrel to the front end of the barrel and extending the mandrel toward the extrusion direction. CONSTITUTION:The food extruder is composed of a cylindrical barrel 1, a screw 3 rotating in the barrel 1 and a die hole attached to the front end of the barrel 1. The die 4 is provided with an inner mandrel 5 extended toward the extrusion direction. The extension length of the inner mandrel 5 is >=0.5 times the maximum inner diameter of outer die 4. A food having a central hole of an arbitrary shape can be continuously extrusion molded in high accuracy by changing the cross-sectional shape of the inner mandrel.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a die for a food extruder.

[Conventional technology]

Conventionally, while giving a hollow shape to food materials using an extruder,
Cylindrical dies are known as dies for molding.

As shown in Fig. 4, this is composed of an inner mandrel a and an outer die b, and the inner mandrel a and the outer die are connected to one end of a cylinder barrel e of an extruder equipped with a raw material supply section C and equipped with a screw d. The die b is connected by a wing-shaped support f, forming an annular land. Although there are various land thicknesses and land outer diameters depending on the shape of the intended product, there is no example in which the inner mandrel a is extended from the outer die b in the extrusion direction.

[Problem to be Solved by the Invention 1] When a food material is extruded by an extruder and expands at the die exit, expansion also occurs in a direction perpendicular to the extrusion direction, so the cross section of the hollow inner hole of the expanded material changes depending on the swelling ratio, and its cross-sectional shape, that is, the hollow inner hole, tends to be distorted.

The present invention provides a die whose inner surface of the hollow inner hole is not affected by the degree of swelling during extrusion molding, and which makes it possible to produce a expanded product having a hollow inner hole of any shape. This is the solution.

[Means for solving problems]

The inventors conducted various studies to solve the above-mentioned interlayer problem, and as a result, the problem was solved by completing a new die shape.

In other words, in a food extruder, a cylindrical cylinder barrel is used, a screw rotates within the barrel, and a die attached to the tip of the barrel has an inner mandrel extended in the extrusion direction. This solved the problem.

At this time, by varying the shape and slit width of the outer die and inner mandrel of the die part, puffed foods having various shapes such as circular, triangular, star-shaped, etc., and having hollow inner holes of different thicknesses can be obtained. .

The minimum extension length of the inner mandrel must be approximately 0.5 times the maximum inner diameter of the outer die, and the maximum length is preferably approximately 10 times the maximum inner diameter of the outer die.
If it is less than 5 times, the swelling on the inner surface of the hollow inner hole is insufficiently prevented, and if it is more than 10 times, the frictional resistance with the inner mandrel becomes large due to cooling of the extruded food material, which is not preferable.

[Effect]

According to the die according to the present invention, when the food material extruded by the extruder causes swelling at the die exit, the food material is prevented from swelling inside the hollow inner hole. The cross-sectional shape is equal to that of the inner mandrel. Namely.

The food material extruded into the atmosphere from the die exit is cooled and solidified while maintaining the cross-sectional shape of the inner mandrel, so by changing the cross-sectional shape of the inner mandrel, it is possible to create foods with hollow inner holes of arbitrary shapes. can be extruded continuously with high precision.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
, 2 shows an embodiment of the present invention, 1 is a cylinder barrel of a food extruder, and an outer die 4 connected to this and a wing-shaped support 6 are fixed to the outer die. It consists of 5 inner mandrels.

Furthermore, the extrusion-side aperture surface of the inner mandrel extends in the extrusion direction from the extrusion-side aperture surface of the outer die. Note that the distance from the extrusion opening surface of the outer die to the extrusion opening surface of the inner mandrel is called the inner mandrel extension length.

Food raw materials are supplied from a raw material supply section 2 to a cylinder barrel 1, and are conveyed toward a die while being extruded by a screw 3 and a cylinder barrel 1.

Food raw materials extruded into the atmosphere from the die tend to expand due to a sudden drop in pressure, but the extension of the inner mandrel prevents the expanded material from expanding inside the hollow inner hole. In addition, the expanded product, which expands only in the direction perpendicular to the extrusion direction and opposite to the inside of the hollow hole, releases thermal energy due to rapid expansion, and as the temperature rapidly decreases, it solidifies and becomes a molded product.

〔Effect of the invention〕

According to this invention, when a food material is extruded using an extruder, a new hollow food product is produced in which the shape of the hollow inner hole is arbitrary and relatively smooth, and the outer surface shows a puffed shape. It had good performance and could be manufactured continuously.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is an enlarged view of the die portion, FIG. 3 is a view taken along the line A-A in FIG.
The figure is a cross-sectional view of a conventional die. In the figure, the components are: 1 cylinder barrel 2 raw material supply section 3 screw 4 outer die 5 inner mandrel 6 support.

Claims (1)

[Scope of Claims] 1) A die for an extruder having a cylindrical cylinder barrel, a screw rotating within the barrel, and a die hole attached to the tip of the barrel, the die having an inner mandrel in the die portion. A die for a food extruder characterized by being extended in the extrusion direction. 2) The die for a food extruder according to claim 1, wherein the extension length of the inner mandrel is 0.5 times or more the maximum inner diameter of the outer die.