JPH0259711B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and apparatus for producing yuba, and more particularly to a method and apparatus for producing yuba, which can improve the quality of yuba.

[Prior art] Yuba, which is obtained by heating soy milk and collecting the coagulated thin film that forms on the liquid surface, is widely known as a traditional food in Japan. It is also attracting attention as a health food rich in vegetable fats.

Conventionally, to produce yuba, soybeans are soaked in water, then ground and filtered to obtain soymilk, which is then poured into a heating tank and heated at a temperature of about 90°C for 10 to 15 minutes. Then, the solidified thin film formed on the liquid surface was scooped up one by one with a stick and dried.

However, in this classical method for producing Yuba, the work is complicated, and furthermore, it is time-consuming because the Yuba is scooped out one by one after a thin film has solidified on the surface of the liquid, and it is difficult to make it continuous.

Therefore, in the past, various improvements have been made to the manufacturing method or equipment for yuba (Japanese Patent Application Laid-open No. 51-22844, No. 54-80448, No. 54-80448, No.
50872).

For example, Japanese Patent Laid-Open No. 51-22844 discloses the following method for producing yuba.

That is, as shown in FIG. 8, soy milk 12 is poured into the soy milk tank 10, and a heating device 14 is installed at the bottom of the soy milk tank 10.

Then, the liquid level 1 of the soymilk 12 in the soymilk tank 10 is
2a is coated with a film 16 that is permeable to water vapor.

In this state, when the soybean milk 12 in the soybean milk tank 10 is heat-treated by the heating device 14, a coagulated thin film 18 is formed on the liquid surface 12a of the soybean milk 12.

The coagulated thin film 18 is adhered to the film 16 with a suitable adhesive force, and when the film 16 is pulled up, the coagulated thin film 18 is also pulled up together with the coagulated thin film 18, and after the film 16 is pulled up, the coagulated thin film 18 is easily peeled off naturally. Then, it is subjected to a subsequent drying process.

Therefore, according to this method, it becomes easy to pull up the solidified thin film, and it is also possible to achieve continuous production.

[Problems to be Solved by the Invention] Problems of the Prior Art However, in this method of producing yuba, the problem is that it takes a long time to form a coagulated thin film on the surface of the soybean milk liquid. It was hot.

That is, the formation of a coagulated thin film on the surface of the soybean milk liquid is thought to be due to the evaporation of water at the liquid surface, which increases the protein concentration at the liquid surface and causes mutual reactions. However, if the surface of the soymilk liquid is coated with a film, even if the film has excellent water vapor permeability, the evaporation of water from the liquid surface will be significantly delayed, and if the soymilk concentration is constant, a thin film will coagulate. It takes several times as much time to form.

In addition, with the conventional method of retaining soymilk in a soybean milk tank and heating the soymilk, as the number of coagulated thin films increases, the composition of the residual liquid changes, making it impossible to maintain a constant quality. There were also some problems.

In other words, soy milk contains a mixture of components that coagulate easily and components that tend to remain soluble in the residual liquid, and as the coagulated thin film is removed, the concentration of non-coagulable components in the residual soy milk increases. It is.

Furthermore, the long-term heating causes changes in the composition of the soymilk itself, making it impossible to continuously collect high-quality coagulated thin films.

As a result, the quality of the dried bean paste obtained by collecting and drying the coagulated thin film is not stable, resulting in low product value.

OBJECT OF THE INVENTION The present invention has been made in view of the problems of the prior art described above, and its purpose is to provide a method and apparatus for efficiently producing bean curd of consistent quality.

[Means for Solving the Problems] In order to achieve the above object, the method for producing yuba according to the present invention includes injecting soy milk in a thin layer onto a film and heat-treating the soy milk on the film. Features.

Further, the manufacturing apparatus according to the present invention includes a lower mold having a concave portion of a predetermined shape on the upper surface, a cylindrical upper mold that fits into the recessed portion with a film interposed therebetween, and a cylindrical upper mold that is closely attached to the inner wall of the cylindrical upper mold. and a cutter that can be moved up and down.

Furthermore, another manufacturing apparatus according to the present invention includes a lower mold having a concave portion of a predetermined shape on the upper surface, and a cylindrical upper mold that is fitted into the concave upper part via a film and has a resin coating formed on the inner wall. It is characterized by including the following.

[Function] Since the method for producing yuba according to the first invention of the present application has the above-described means, the soymilk injected in a thin layer onto the film becomes a solidified thin film through subsequent heat treatment, and this is dried to form a solidified thin film. It is possible to produce yuba.

At this time, unlike conventional production methods, the soymilk is poured onto a film, so the film does not hinder the evaporation of water from the soymilk, and a thin solidified film is formed in an extremely short time.

In addition, only a thin layer of soy milk is injected onto the film to form one sheet of bean curd, which is different from the conventional method of heating a large amount of soy milk and collecting a solidified thin film from the liquid surface. Unlike this method, the concentration of non-coagulated components in the residual liquid does not increase, or the soymilk itself deteriorates due to long-term heating, making it possible to consistently produce bean curd with a constant quality. It becomes possible.

Moreover, the solidified thin film formed on the film is easy to handle, and the conventional process of lifting it from the soybean milk vat is no longer necessary, making manufacturing easier and making it possible to achieve continuous production. .

Moreover, the yuba manufacturing apparatus according to the second invention of the present application includes:
Since the above-mentioned means is provided, the cylindrical upper mold is fitted into the concave portion of the lower mold via the film, and soy milk is injected in a thin layer into the frame formed by the inner wall of the upper mold and the film.

Then, the soybean milk within the frame is heat-treated to form a coagulated thin film.

After the solidified thin film is formed, the cutter is moved downward in close contact with the inner wall of the upper mold to separate the adhesive between the solidified thin film and the inner wall of the cylindrical upper mold, thereby separating the cylindrical upper mold from the lower mold.

As a result, a solidified thin film is formed on the film.

Furthermore, since the yuba manufacturing apparatus according to the third invention of the present application forms a resin coating on the inner wall of the cylindrical upper mold, even if a solidified thin film is formed within the frame formed by the upper mold inner wall and the film, The solidified thin film does not adhere to the inner wall of the upper mold, and the solidified thin film adhered to the film can be obtained by simply separating the cylindrical upper mold from the lower mold.

As explained above, according to the inventions of the present application, it is possible to form solidified thin films one by one on the film, so it is possible to produce bean curds of consistently stable quality in a short time, and also to reduce the production time. It becomes easier.

[Examples] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The method for producing yuba according to the present invention is characterized by injecting soy milk in a thin layer onto a film and then heat-treating it to form yuba, and a polyvinylidene chloride resin coating is suitable for the film. It is.

In addition, the thin layer thickness of soy milk needs to be set appropriately depending on the soy milk concentration and the required Yuba thickness.
It is usually about several mm to several cm.

The heat treatment is preferably maintained at a temperature of about 80 to 90°C for 10 to 15 minutes.

Furthermore, by forming a coagulated thin film on a highly heat-shrinkable film and lowering the tension of the film before the thin film hardens, wrinkles can be formed in the coagulated thin film and an appearance similar to that of classic yuba can be obtained. It is possible.

Furthermore, the present inventors have discovered that after a solidified thin film is formed on a film, by spraying water vapor or fine water droplets onto the solidified thin film, the solidified thin film can be peeled off from the film extremely easily.

Even in this case, the thin film does not liquefy again due to moisture absorption by the solidified thin film itself.

Next, a yuba manufacturing apparatus used in the above-mentioned yuba manufacturing method will be explained based on FIG.

In the figure, a concave portion 50 is formed on the upper surface of the lower mold 50.
A is provided. The lower part of the lower mold 50 is immersed in hot water 52 maintained at a temperature of 80 to 90°C,
An air supply pipe 54 for delivering clean air for film separation and an exhaust pipe 56 for discharging air from the recess 50a are provided at the bottom of the recess 50a.

An upper mold 60 is fitted into the concave portion 50a of the lower mold 50 via a film 38 made of polyvinylidene chloride, and a cutter 62 is disposed in close contact with the inner wall 60a of the upper mold 60.

Inside the frame 64 formed by the inner wall 60a of the upper mold and the film 38 disposed on the concave portion 50a of the lower mold, there is a soy milk feed pipe 66 for feeding soy milk to the frame 64, and a steam pipe for spouting steam. A pipe 68 is arranged.

The yuba manufacturing apparatus according to the illustrated example is constructed as described above, and its operation will be explained next with reference to FIGS. 1 to 5.

First, as shown in FIG. 1, the upper mold 60 is fitted into the concave portion 50a of the lower mold 50 with the film 38 interposed therebetween. Here, the film 38 and the concave portion 50
The air present between the film 38 and the film 38 is exhausted through the exhaust pipe 56, and the film 38 can be brought into close contact with the concave portion 50a.

Furthermore, since polyvinylidene chloride is used as the film 38, the film 38 is brought into close contact with the concave portion 50a due to the heat shrinkability of the film.

Then, soy milk is fed into the frame 64 from the soy milk feed pipe 66.
The soymilk 12 is heated through a lower mold 50 with hot water 52.

When this state is maintained for about 15 minutes, the soymilk 12 coagulates and forms a coagulated thin film 18.

Here, since the soymilk 12 is in contact with air, it is extremely easy to form a coagulated thin film.

However, the solidified thin film 18 is in close contact with the inner wall 60a of the upper mold 60.

After the solidified thin film is formed, steam is jetted from the steam pipe 68 to the position where the upper mold inner wall 60a and the solidified thin film 18 are in close contact with each other, as shown in FIG.

As a result, the adhesive force between the solidified thin film 18 and the upper die inner wall 60a is significantly reduced.

Next, as shown in FIG. 3, the cutter 62 is lowered to completely separate the solidified thin film 18 from the inner wall 60a of the upper mold.

Note that care must be taken here so that the cutter 62 does not cut the film 38 when the cutter 62 descends.

Next, as shown in FIG. 4, the upper mold 60 rises and separates from the lower mold 50.

At this time, the cutter 62 is maintained in the lowered state, and even if the adhesive portion between the solidified thin film 18 and the upper mold inner wall 60a remains in the state shown in FIG. 3, it will not be cut by the cutter 62. becomes.

Next, the cutter 62 also rises, but at this stage there is a possibility that the film 38 is in close contact with the lower die concave portion 50a. Therefore, as shown in FIG. 5, clean air is supplied from the air supply pipe 54 provided in the lower mold recess 50a, and the film 38 and the recess 50a are
Separation takes place.

As a result, the solidified thin film 18 is obtained while being placed on the film 38, and is further subjected to drying and the like to become bean curd skin.

In addition, in the above process, by relaxing the film 38 before the solidified thin film 18 is completely hardened, it is possible to form a product with wrinkles similar to the classic Yuba.

As explained above, according to the apparatus for producing yuba in this embodiment, it is possible to produce homogeneous yuba in a short time with simple operations.

FIG. 6 shows another yuba manufacturing apparatus of the present invention, and parts corresponding to those in FIG.
00 is added and the explanation is omitted.

The characteristic feature of this embodiment is that the upper mold 160
The outer wall and the upper surface of the lower mold 150 are coated with a fluororesin, and the resin coating 170 coated on the upper mold 160 prevents the solidified thin film 18 from adhering to the inner wall of the upper mold, and prevents the upper surface of the lower mold from adhering. The resin coating 172 formed on the lower mold concave portion 150a and the film 158
Prevent close contact with.

Therefore, as shown in FIG. 7, if the upper mold 160 is raised after the soymilk 12 becomes a coagulated thin film 18, the coagulated thin film 18, the upper mold 160, and the film 1
58 and the lower mold concave portion 150b can be easily separated, making it unnecessary to use a cutter, a steam pipe, an air supply pipe, etc. as in the apparatus shown in FIG.

Here, as the resin for forming the resin coatings 170 and 172, in addition to the above-mentioned fluororesin, carbon-based resin and the like are suitable.

In addition, according to the present invention, soy milk is supplied in a thin layer on the film and heated to form a solidified thin film one by one, so other auxiliary materials such as sesame or seaweed can be added, special seasonings, etc. is possible.

Moreover, the shape of the inner wall of the upper mold makes it possible to manufacture bean curds of various shapes, making it possible to further expand the use of bean curd.

That is, in recent years, yuba has been expected to be used not only as an additive for boiled foods as in the past, but also as various food processing materials or edible coatings.
For this reason, there is a wide demand for accurate and uniform shape forming, and the present invention appropriately meets that demand.

Furthermore, the present invention enables continuous or automatic production of bean curd skin.

[Effects of the Invention] As explained above, according to the present invention, soy milk is injected onto the film in a thin layer, and then heat-treated to form a solidified thin film one by one. can be manufactured easily and in a short time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the yuba manufacturing apparatus according to the present invention, FIGS. 2 to 5 are explanatory diagrams of the operation of the yuba manufacturing apparatus according to FIG. 1, and FIG. 6 is another yuba manufacturing apparatus according to the present invention. FIG. 7 is an explanatory diagram of the operation of the yuba manufacturing apparatus according to FIG. 6, and FIG. 8 is an explanatory diagram of the conventional yuba manufacturing method. 12... Soy milk, 18... Coagulated thin film, 50, 15
0...Lower mold, 50a, 150a...Concave portion, 52
...Hot water, 58,158...Film, 60,1
60...Upper mold, 60a, 160a...Inner wall, 62
...Katsuta, 64,164...Frame, 170,17
2...Resin coating.

Claims (1)

[Scope of Claims] 1. A method for producing bean curd, characterized by injecting soybean milk in a thin layer onto a film and then heating it to form a solidified thin film. 2. The method for producing tofu skin according to claim 1, wherein the film is formed from polyvinylidene chloride. 3. A method for producing bean curd skin according to claim 1 or 2, characterized in that after the heat treatment, steam or mist water is sprayed onto the solidified thin film. 4. a lower mold having a concave portion of a predetermined shape on its upper surface; a cylindrical upper mold that fits into the recess through a film; a cutter that is in close contact with the inner wall of the cylindrical upper mold and is movable up and down; 1. An apparatus for producing bean curd, characterized by injecting soy milk in a thin layer into a frame formed by an inner wall of an upper mold and a film, and heat-treating the soy milk. 5. The apparatus for producing bean curd skin according to claim 4, characterized in that a soybean milk feeding pipe and a steam pipe are provided on the frame. 6. The apparatus for producing bean curd skin according to claim 4 or 5, characterized in that the concave portion of the lower mold is provided with an air supply pipe and an exhaust pipe. 7. In the device according to claims 4 to 6,
A yuba production device characterized in that the film is formed from polyvinylidene chloride. 8. A lower mold having a concave portion of a predetermined shape on its upper surface; and a cylindrical upper mold that fits into the concave portion via a film and has a resin coating formed on its inner wall, the inner wall of the upper mold and the film A yuba manufacturing device characterized by injecting soy milk in a thin layer into a frame formed by and heat-treating it. 9. The yuba manufacturing apparatus according to claim 8, characterized in that a soybean milk feeding pipe is provided on the frame. 10. The apparatus for producing bean curd skin according to claim 8 or 9, characterized in that a resin coating is also formed on the concave portion of the lower mold. 11. The apparatus for producing bean curd skin according to claims 8 to 10, wherein the resin coating is made of a fluorine-based resin. 12. The apparatus for producing bean curd skin according to claims 8 to 10, wherein the resin coating is made of carbon-based resin.