JP2002235896A - Cold milk transporting double pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold milk transporting pipe having the effect of keeping in-factory transported cold milk cold. SOLUTION: An outer pipe 2 closed at both ends 3, 4 is provided on an outside of a cold milk transporting pipe 1 to form a double pipe, and air between the inner pipe 1 and the outer pipe 2 is ventilated to be rarefied. The double pipe units wherein a space between the inner pipe and the outer pipe is rarefied by ventilating air are successively provided throughout the length of the transporting pipe at short intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold milk transfer pipe developed to suppress a rise in temperature of cold milk caused by outside air while the milk is being transferred in a factory.

[0002]

2. Description of the Related Art Milk and other milk drinks are sterilized at about 5 ° C.
The distance for transferring the cooled milk through the transfer pipe from the storage tank to the filling process such as bottling depends on the size of the factory, but often ranges from 30 to 40 m. Often, cold air is warmed by the high temperature of the outside air, and the temperature often rises above the allowable temperature of 10 ° C. to 13 ° C. or more. In order to prevent this temperature rise, the transfer tube was covered with a heat insulating material such as glass wool, but the transfer tube was washed and steam sterilized every day. Because of the passage, dew condensation occurs on the outer peripheral surface, and the glass wool contains moisture, thereby impairing the cooling effect. Further, a heat insulating material such as glass wool is a material that is difficult to use in food factories because of the possibility of generating fine fiber dust. Therefore, most commercial milk factories use a stainless steel bare tube as a cold milk transfer tube, and thus have the problem of raising the temperature of the transferred cold milk as described above.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cold milk transfer pipe which is effective for keeping cold milk transferred in a factory.

[0004]

Means adopted by the present invention are as follows. 1. An outer tube having both ends closed is provided outside the inner tube for transferring cold milk to form a double tube, and the air between the inner tube and the outer tube is evacuated to make the air in this portion thin. 2. A structure in which a double-pipe unit with a short interval in which the air between the inner pipe and the outer pipe is diluted is connected over the entire length of the transfer pipe.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. As shown in FIGS. 1 and 2, the double tube for transferring cold milk according to the present invention comprises an inner tube for transferring cold milk (1). Outside ends (3),
(4) is provided with a closed outer tube (2) to form a double tube,
By evacuating the air between the inner tube and the outer tube (5) and making the air in this portion thin, the cooling effect of the transferred cold milk can be obtained.

Further, as shown in FIG. 3, the double tube for transferring cold milk of the present invention dilutes the air in the space (5) between the inner tube (1) and the outer tube (2) as described above. The short pipe unit (6) having a short interval is connected over the entire length of the transfer pipe.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The tube of the present invention is made of stainless steel, the length of one unit is 3940 mm, the interval between the units is 30 mm, and the interval between the inner tube and the outer tube is 6 mm. The total length of the transfer tube is about 35 m.

A method for removing air between the inner pipe and the outer pipe will be described. A small hole is made in a part of the outer tube of each double tube unit, the double tube is heated with a burner, and the temperature of the air between the inner tube and the outer tube is raised to about 200 ° C. The heated air expands out of the hole and the air inside becomes lean.
When the air escape stops, use a welding rod to close the hole. By this method, the air density between the inner tube and the outer tube is about 3
0% decrease.

As described above, a cold milk transfer tube in which a double tube unit diluted by removing about 30% of the air between the inner tube and the outer tube over the entire length of the cold milk transfer tube at an outside air temperature of 35.degree. An experiment was conducted to determine whether or not there was a cooling effect on cold milk. In the experiment, the temperature of each milk in the tank storing the sterilized and cooled milk, immediately before the transfer pipe was transferred from the tank to fill the container, and in the container after the filling, were compared with the conventional single temperature. And the double tube of the present invention. Table 1 shows the results.
Indicated by

[Table 1]

In Table 1, the temperature after filling slightly increases compared to immediately before filling due to the influence of the temperature of the container. As can be seen from the table, it can be seen that the practice of the present invention keeps the temperature of the milk below the permissible 10 ° C. and achieves a cooling effect.

[0011] By reducing the air between the inner tube and the outer tube, the cooling effect of the cold milk can be obtained because the heat transfer by the convection of the air is gentle due to the decrease of the air density, and the cold milk is thereby cooled. It is considered that the temperature rise is suppressed.

[0012] The method of diluting the air between the inner tube and the outer tube is not limited to only the method of the above-described embodiment.
A method using a vacuum pump or the like can also be selected.

[0013]

According to the present invention, the above-mentioned problems when using a heat insulating material such as glass wool are solved, and a clean and permanent cooling effect of the transferred cold milk can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a part of the product of the present invention.

FIG. 2 is a cross-sectional view of the invention shown in FIG.

FIG. 3 is a schematic diagram showing a state in which double-pipe units at short intervals in the present invention are coupled.

[Explanation of symbols]

1: Inner tube for transferring milk milk, 2: Outer tube, 3, 4: End of outer tube, 5: Diluted part by bleeding air between inner tube and outer tube, 6: Double at short intervals Tube unit.

Claims (2)

[Claims] An outer tube having both ends closed is provided outside the inner tube for transferring cold milk to form a double tube, and the air between the inner tube and the outer tube is evacuated to make the air in this portion thin. A double tube for transferring cold milk, characterized in that the cold milk transfer effect can be obtained by doing so. 2. The cold milk transfer according to claim 1, wherein a double-pipe unit having a short interval in which air between the inner pipe and the outer pipe is diluted is connected to the entire length of the transfer pipe. For double pipe.