JPH0630686A - Device for continuously dispersing and gelatinizing starch - Google Patents

Abstract

PURPOSE:To provide a continuous starch-dispersing and gelatinizing device having a starch- dispersing tank, a solvent-feeding member, a starch-feeding member, a volumetric pump directly coupled to the tank, and a starch dispersion-heating member, capable of being compacted into a smaller size, and capable of gelatinizing the starch even in a small amount, the starch dispersing tank being conical and having a solvent-feeding port toward the tangent line of the large diameter part. CONSTITUTION:In the continuous starch-dispersing and gelatinizing device, spring water as a solvent is fed from the feeding piping P1 of a solvent-feeding section into a starch- dispersing tank 3 through a solvent-feeding port 4. Starch powder is also fed from a hopper 1 into the large diameter part of the conical part of the starch-dispersing tank 2 through the screw feeder 2 of a starch-feeding section for feeding the starch powder, and subsequently mixed with the solvent. The starch-dispersing tank 3 comprises a conical container having the solvent-feeding port 4 for feeding the spring water as the solvent toward the tangent line of the large diameter part of the conical part. The starch dispersion is subsequently discharged through a volumetric pump 6 directly connected to the small diameter part of the conical part of the starch tank 3 comprising the conical container, and the discharged starch dispersion is thermally gelatinized in starch dispersion-heating section 7 on the downstream side of the volumetric pump 6. Thereby, the starch can continuously be gelatinized in a small space by the use of the small device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a continuous starch in which a starch dispersion in a powder form is dispersed in a solvent such as fresh water to form a starch dispersion, and the dispersion is subsequently heated to gelatinize. Dispersion gelatinizer.

[0002]

2. Description of the Related Art As a device for obtaining a starch dispersion by dispersing starch powder in fresh water, there has been a device shown in FIG.

FIG. 3 is a schematic diagram showing the flow of a conventional apparatus. Supply the starch powder and fresh water to the dispersion tank 31,
Stir with the stirrer 32 to obtain a starch dispersion liquid by batch processing. The starch dispersion liquid is stored in the storage tank 35 via the three-way valve 34 by the circulation pump 33. The storage tank is equipped with a stirrer 36 and the starch dispersion is stirred. The starch dispersion liquid in the storage tank is sent to a gelatinization process (not shown) by a slurry pump 38 via a three-way valve 37. The valves 39 and 40 are closed during the operation of the device. If necessary, fresh water can be supplied from the conduit 41.

The storage tank has a liquid level controller (not shown) and excess starch dispersion is removed by a three-way valve 34.
Is returned to the dispersion tank.

The supply of starch powder to the dispersion tank is
The starch dispersion was obtained by batch processing as described above, although it may be continuously metered in with a belt feeder or the like.

[0006]

The above-mentioned conventional apparatus for obtaining a starch dispersion liquid by batch processing has a tank for storing the starch dispersion liquid in addition to a dispersion tank for dispersing the starch powder in water. Therefore, a large installation space is required.

[0007] In addition, some starch or polyvinyl alcohol (PV) which swells or gelatinizes in cold water is used.
The mixture of A), polymagnesium acrylate (PAM) and other water-soluble polymer substances and starch has a high viscosity in the dispersion tank 31 and the storage tank 35. Therefore, continuous gelatinization cannot be performed by a conventional device using a non-positive displacement pump.

An object of the present invention is to provide a continuous starch-dispersion gelatinizing apparatus which solves the above-mentioned problems of the prior art.

[0009]

According to the present invention, the above object can be achieved by the following continuous starch-dispersion gelatinizing apparatus.

A starch dispersion tank having a solvent supply port for supplying a solvent in a tangential direction of a large diameter part of a cone, a solvent supply unit for supplying a solvent to the solvent supply port of the starch dispersion tank, and the starch. A starch supply unit for supplying starch powder to the large diameter part of the cone of the dispersion tank, a positive displacement pump directly connected to the small diameter part of the cone of the starch dispersion tank consisting of the conical container, and a downstream side of the positive displacement pump. A continuous starch dispersion gelatinizer comprising a starch dispersion heating section.

The starch feed section preferably comprises a hopper and a screw feeder directly connected to its bottom.

The above apparatus preferably has a solvent supply section for supplying a solvent on the downstream side of the positive displacement pump and on the upstream side of the heating section.

The above apparatus preferably has a solvent supply section for supplying a solvent downstream of the heating section.

The heating unit is preferably designed so that the heating temperature can be freely controlled.

[0015]

When the solvent is supplied from the solvent supply port to the starch dispersion tank, the solvent swirls along the inner wall of the starch dispersion tank and descends to form a swirling flow. The starch powder can be uniformly dispersed in the solvent simply by dropping the starch powder in the swirling flow of the solvent.

In the positive displacement pump, the introduction amount of the starch dispersion liquid obtained in the starch dispersion tank from the inlet side can be set to be equal to or slightly larger than the supply amounts of the solvent and the starch powder to the starch dispersion tank. The starch dispersion liquid can be continuously sent out from the outlet side without requiring the liquid level controller of the dispersion tank.

When the amount of solvent and starch powder supplied to the starch dispersion tank is smaller than the discharge amount of the positive displacement pump, a positive displacement pump capable of discharging the dispersion liquid even if air is mixed from the suction side is selected. use.

If a positive displacement pump is not provided, only a starch dispersion having a concentration of up to about 5% by weight can be obtained, but by providing a positive displacement pump, a starch dispersion of 10% by weight or more can be obtained. Further, when the positive displacement pump is indirectly connected to the starch dispersion tank via a pipe, the pipe and the flow rate must be set so that the flow velocity is a certain level or higher in order to prevent the starch dispersion from starch precipitation. However, by directly connecting the positive displacement pump to the small diameter portion of the cone of the starch dispersion tank, the starch dispersion liquid can be delivered at a lower flow rate and flow rate.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The starch dispersion tank comprises a conical container. That is, it has a space of a cone or a truncated cone inside the tank. Therefore, the outer shape of the tank may be something other than a cone.

The position where the starch powder is added to the swirling flow of the solvent is
Preferably, it is a fan-shaped region R having a central angle of 90 ° and surrounded by a straight line Y that passes through the central axis O of the conical container and is orthogonal to the solvent flow (see FIG. 2).

A positive displacement pump is a type of pump that sends fluid from an inlet side to an outlet side by movement or change of a sealed space that occurs between a casing and a movable member inscribed therein. A rotary positive displacement pump is preferable. These pumps include gear pumps, screw pumps, vane pumps, but more preferably uniaxial eccentric screw pumps.

[0022]

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

FIG. 1 is a schematic diagram showing the flow of an example of the continuous starch dispersion gelatinizing apparatus of the present invention. FIG. 2 is a schematic sectional view of the starch dispersion tank in the radial direction of the large diameter portion of the cone.

The starch powder is supplied to the hopper 1. The hopper has a starch powder level controller (not shown) and adjusts the upper surface of the starch powder so that it is between the upper limit H and the lower limit L.

The screw feeder 2 is provided on the bottom of the hopper.
Is directly connected, the lower part of the starch powder in the hopper is introduced, and the starch powder is continuously and constantly supplied to the starch dispersion tank 3.

Fresh water as a solvent is supplied from a conduit P0.
The conduit P0 is divided into fresh water supply pipes P1, P2 and P3, each of which can supply fresh water.

The starch dispersion tank 3 consisting of a conical container has a conical internal space having a central axis in the direction of gravity, and a solvent supply port 4 for supplying a solvent flow in the tangential direction of the large diameter part of the cone.
And an inspection port 5 for inspecting the inside of the tank.

The solvent supply port 4 is connected to the fresh water supply pipe P1 and is tangential to the large diameter portion of the cone of the tank defining the conical inner space (circular direction perpendicular to the central axis of the conical inner space). A constant amount of fresh water flow F is continuously supplied in the tangential direction of the cross section.

The fresh water flow supplied from the solvent supply port 4 descends while swirling along the inner wall 3a of the dispersion tank into a swirling flow. The starch powder supplied by the screw feeder is dropped from the upper part of the dispersion tank into the swirling flow of the fresh water in the large diameter part of the cone of the dispersion tank, and the starch powder is uniformly dispersed in the fresh water. The preferable supply position of the starch powder is R in FIG.
This is the area indicated by.

The portion above the solvent supply port of the starch dispersion tank does not necessarily have to be sealed, but can be formed by sealing except the portion for supplying the starch powder.

The positive displacement pump 6 (a rotary positive displacement uniaxial eccentric screw pump, a Mohno pump manufactured by Haysin Co., Ltd.) is directly connected to the bottom surface of the dispersion tank to suck the starch dispersion liquid in the lower portion of the dispersion tank obtained in the dispersion tank. It inhales from the mouth and continuously delivers a fixed amount from the outlet. In addition, the MONO pump manufactured by Haysin Co., Ltd. can discharge the dispersion liquid without any problem even if air is mixed in from the suction side.

If necessary, fresh water can be supplied to the starch dispersion liquid sent from the positive displacement pump through the fresh water supply pipe P2, diluted to a desired concentration, and then sent to the gelatinization step.

The starch dispersion is heated in the heater 7 by supplying steam to gelatinize it. The heating of the heater is performed by introducing steam from the conduit P4. The temperature control is performed by adjusting the amount of steam introduced into the heater with a TIC (temperature indicating regulator) 8 and a valve 9 so that the temperature of the gelatinized starch dispersion liquid at the point A of the pipe becomes a desired temperature. To do. It is preferable to select and use a heater that can be stably gelatinized even when air is mixed therein.

The heater may be, for example, Jitsuko Sho 61-3.
Dispersion mixers such as those described in Japanese Patent No. 8652 and Japanese Patent Publication No. 63-34774 can be used. These dispersion mixing devices are devices that heat by dispersing and mixing water vapor in the starch dispersion liquid.

After passing point A of the pipe, if necessary, fresh water can be supplied to the gelatinized starch dispersion liquid from the fresh water supply pipe P3, and then the gelatinized starch dispersion liquid is supplied from the discharge pipe P5 via the three-way valve 10. Can be obtained.

The valves 11, 12 and 13 are valves for controlling the fresh water supply to the fresh water supply pipes P1, P2 and P3, respectively.

Reference numerals 14, 15 and 16 are flow meters.

The check valves 17 and 18 prevent the reverse flow of fresh water in the fresh water supply pipes P2 and P3, respectively.

Reference numeral 19 is a fresh water supply pump (spiral pump) for supplying fresh water to the pipes P1, P2 and P3.

[0040]

The continuous starch dispersion / gelatinization apparatus of the present invention comprises a conical container and a starch dispersion tank having a solvent supply port for supplying a solvent in a tangential direction of a large diameter portion of a cone, and a solvent supply for the starch dispersion tank. Directly connected to the solvent supply part for supplying the solvent to the mouth, the starch supply part for supplying the starch powder to the large diameter part of the cone of the starch dispersion tank, and the small diameter part of the cone of the starch dispersion tank composed of the conical container. Since it consists of a positive displacement pump and a starch dispersion liquid heating section on the downstream side of the positive displacement pump, the steps of uniformly dispersing the starch powder in a solvent to form a starch dispersion liquid and then gelatinizing the dispersion liquid are continuously performed. You can do it. And even a small amount of starch dispersion liquid can be continuously obtained and gelatinized.

The continuous starch-dispersing gelatinizer of the present invention is
Since the agitation device and the liquid level controller are not essential for the starch dispersion tank and the storage tank for the starch dispersion is not essential, the device can be made smaller and the installation space can be reduced.

Furthermore, according to the apparatus of the present invention, a starch which is swollen or gelatinized in cold water or a mixture of polyvinyl alcohol, magnesium polyacrylate and other water-soluble polymer substances and starch is continuously glued in a small space. Can be converted.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a flow of an example of a continuous starch dispersion gelatinizing apparatus of the present invention.

FIG. 2 is a tangential sectional view of a large diameter portion of a cone of a starch dispersion tank including a conical container according to the present invention.

FIG. 3 is a schematic diagram showing a flow of a conventional starch powder dispersion device.

Continued Front Page (72) Inventor Atsushi Sakakibara 6-3-15 Honmachi, Funabashi, Chiba Prefecture Oji National Co., Ltd.

Claims (5)

[Claims] 1. A starch dispersion tank comprising a conical container and having a solvent supply port for supplying a solvent in a tangential direction of a large diameter part of the cone; and a solvent supply unit for supplying a solvent to the solvent supply port of the starch dispersion tank. A starch supply unit for supplying starch powder to the large diameter part of the cone of the starch dispersion tank, a positive displacement pump directly connected to the small diameter part of the cone of the starch dispersion tank consisting of the conical container, and a downstream of the positive displacement pump. A continuous starch dispersion gelatinizing device comprising a starch dispersion liquid heating section on the side. 2. The continuous starch dispersion gelatinizer according to claim 1, wherein the starch supply unit comprises a hopper and a screw feeder directly connected to the bottom thereof. 3. The continuous starch dispersion gelatinizer according to claim 1, further comprising a solvent supply section for supplying a solvent on the downstream side of the positive displacement pump and on the upstream side of the heating section. 4. The continuous starch dispersion gelatinizing device according to claim 1, further comprising a solvent supply unit for supplying a solvent on the downstream side of the heating unit. 5. The continuous starch-dispersing gelatinizer according to claim 1, wherein the heating section can control the heating temperature freely.