JPS60226501A - Preparation of alpha-starch - Google Patents

Abstract

PURPOSE:To prepare alpha-starch useful as a binder and extender for confectionery or food materials, by feeding beta-starch into an inner cylinder, pouring a liquid therein, kneading the beta-starch, and heating and pressurizing the beta-starch while advancing the beta-starch by the rotation of screws. CONSTITUTION:beta-starch 5 is fed from a feeder 6 into an inner cylinder 2, and advanced by the rotation of plural intermeshing screws 8 and 8'. A liquid, e.g. water, is poured from a liquid injection channel 7 into the inner cylinder 7, and the beta-starch 5 is kneaded, heated and pressurized while being fed from a trapezoidal screws 9 to screws 10 of medium width and screws 11 of small width one after another, extruded from a discharge outlet 12, expanded and gelatinized to give the aimed alpha-starch.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing pregelatinized starch, in which so-called beta starch, which is not edible as it is, is pregelatinized (made edible). Pregelatinized starch is widely used in the form of paste or jelly as a binder or filler for confectionery and other general food ingredients, but pregelatinization of beta starch has traditionally required extensive steaming, heating, etc. I needed equipment. Therefore, the purpose of this invention is to propose a method for producing pregelatinized starch very easily.Hereinafter, this invention will be described in detail with reference to the drawings shown as examples.

First, as shown in Fig. 1, the inner cylinder (2) is placed inside the outer cylinder (1).
) is provided, and the space (3) between these two cylinders (1) and (2)
A pipe (4) through which water passes is arranged in a coil to regulate the temperature.

Beta starch (
5) into the inner cylinder (2) is communicated with it, and a liquid injection path is connected to the inner cylinder (2) to supply liquid such as water to the inner cylinder (2). (7) is connected.

Furthermore, a pair of screws (8) (8) are provided in the inner cylinder (2) so as to mesh with each other, as shown in FIG.

Next, the pair of screws (8) (8) are trapezoidal screws (9) with a wide valley at the position of the injection path (6), and subsequently, at the position of the liquid injection path (7). A medium-width screw (10) with a narrowed valley width is formed into an R-shape, followed by a narrow-width screw (11) with a narrowed valley width.

Therefore, first, the trapezoidal screw (
Beta starch (5) is put between the inner cylinder (2) and the bean starch (5), as described above (here, the screw (8) is a trapezoidal screw (9) with a wide valley width, so the bean starch is Similarly, large particles can be fed smoothly.

The beta starch (5) introduced as described above is gradually sent to the next medium-width screw (lO) by the rotation of the pair of screws (8) (8). There, since the width of the screw is narrow, the beta starch is kneaded under pressure, and water and the like are further supplied from the liquid injection path (7) for kneading. The starch kneaded in this way is further gradually sent to the next narrow width screw (11), but since the valley width of the screw is narrower there, it is further pressurized and kneaded, and remains under pressure. It is expanded and extruded from the discharge port (12) as pregelatinized starch.

In addition, an appropriate heating device (not shown) is installed on the outside of the outer cylinder (1).
is provided, and the heating temperature is adjusted by flooding the pipe (4). Therefore, the configuration is such that heating work is performed in addition to crosstalk and pressurization.

In addition, the pair of screws (8) (8) can be implemented as a single thread or multiple threads as necessary. Furthermore, when multiple threads are used, the screw threads are formed with different heights. You can also do that.

This invention has the above-mentioned configuration, and therefore beta starch (5) can be smoothly kneaded, heated, pressurized, and
The present invention has proposed a method for producing pregelatinized starch that can be pregelatinized by extrusion and swelling.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an apparatus embodying the method according to the invention. FIG. 2 is a perspective view of the screw. (2)...Inner cylinder (5)...Beta starch (8)
...Screw agent Patent attorney Tsujimoto - Figure 1 and Figure 2

Claims (1)

[Claims] 1. Beta starch (5) is fed into the inner cylinder (2), and is injected, kneaded, heated, and pressurized while being advanced by the rotation of multiple meshing screws (8).
A method for producing pregelatinized starch, characterized in that it is expanded and extruded as pregelatinized starch.