JPH04217766A - Manufacture of ice having stripe pattern - Google Patents

Abstract

PURPOSE:To manufacture ice having a stripe pattern. CONSTITUTION:An air discharge pipe 8 through which air is jetted is disposed in a freezing can 10. Ice having a stripe pattern is manufactured in a way that ice making raw water in the freezing can is cooled for freezing as air is intermittently jetted through the air discharge pipe. An air pressure P1 in an air jetting pipe when air is jetted is set to a value approximately within a range of a formula I.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing ice having a striped pattern.

0002

[Prior Art] A method of artificially producing ice using an ice-making can has been practiced for a long time, and in such ice-making technology, ice-making raw water in an ice-making can is cooled and frozen while it is left standing. In other cases, transparent ice may be produced if air is jetted against the ice-making raw water in the freezing can and the water is cooled and frozen while being strongly stirred. , was experimentally known.

[0003] The present inventor has conducted research to produce ice having a striped pattern based on the above-mentioned technology and using raw ice water containing dissolved components. The agitation necessary to form a transparent ice layer and the agitation necessary to form a translucent ice layer are performed alternately, resulting in a striped pattern of alternating transparent and translucent ice layers. We have developed and applied for a method and apparatus for producing ice with
Publication No. 66).

[0004] When ice having a striped pattern is produced using the above-mentioned method and apparatus, it is usually carried out as follows. That is, FIG. 1 shows an example of a device for this purpose, in which compressed air from a compressed air reservoir 1 is passed through an air supply pipe 2.
, an on-off valve 3 , a pressure regulating valve 4 , a flexible air supply tube 6 , and an air jet pipe 8 . The freezing can 10 is filled with ice-making raw water 11 containing melted components, floated on a brine pool (container of solution for cooling the freezing can), and cooled by an appropriate cooling device. Further, the pressure regulating valve 4 is controlled by the control device 51 and blows out air at different pressures from the tip of the air blowing pipe 8. Furthermore, the air jet tube 8 may be gradually lifted up by a lift 13 that moves up and down as ice making progresses, and when manufacturing so-called coreless icicles with a hollow center, the air jet tube 8 is It is left stationary without being pulled up, and the ice making is completed when the ice reaches the vicinity of the tip of the air jet pipe 8. In addition, 9 in the figure is an air rectifier plate.

[0005] When making ice, the pressure regulating valve 4 is controlled by a control device 51, and first, high-pressure air is blown for a certain period of time to strongly stir the ice-making raw water to produce a transparent frozen layer. Thereafter, a certain period of time is allowed to pass while the air pressure is lowered and the degree of stirring is reduced to produce a translucent frozen layer. below,
By repeating this process an appropriate number of times, columnar ice having a striped pattern in which a plurality of transparent layers and semitransparent layers are laminated is manufactured. Figure 2 shows 10 ice cubes formed by this method.
This figure shows a fractured view of a columnar ice produced within the ice along its center line I-I, showing a state in which transparent ice layers 21 and translucent ice layers 22 are alternately formed to form a striped pattern. ing.

[0006] In this case, most of the dissolved components such as pigments and fragrances contained in the ice-making raw water are uniformly encapsulated in the frozen layer, ie, the translucent layer, when the degree of stirring is reduced.

[0007]

Since the ice produced by the above method and apparatus has a striped pattern, when used as ice pillars or crushed ice, it gives the user an aesthetic appearance. However, in this case,
Since a major objective is to uniformly distribute the melted components within the ice-making layer, especially within the translucent frozen layer, weak stirring is performed even when making the semi-transparent frozen layer. For this reason, there are cases where the boundary between the transparent frozen layer and the translucent frozen layer is not always clear.

[0008] In addition, when high-pressure air is jetted against the ice-making raw water and cooled and frozen while strongly stirring in order to produce a transparent frozen layer, what kind of pressure air is jetted out is important for transparency. It was not always clear whether it was the best from an operational or operational point of view. The present invention improves the method for producing ice having a striped pattern according to the above-mentioned prior art, and creates a striped pattern in which the boundaries of the striped pattern are clearer and the transparent layer can be produced most effectively. The objective is to obtain a method for producing ice that has the following properties.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the inventor of the present invention, through repeated experiments and research, discovered the optimum pressure for forming a transparent frozen layer, and
It was discovered that when forming a translucent frozen layer, the dissolved components dissolved inside the frozen raw water are dispersed uniformly without any trouble during the ice-making time, even without stirring the frozen raw water at all.
This led to the completion of the present invention.

That is, the present invention provides an air discharge pipe for blowing out air inside the freezing can, and cools the ice-making raw water in the freezing can while intermittently jetting air from the air jetting pipe. A method for producing ice having a striped pattern by freezing, characterized in that the air pressure P1 in the air ejection tube when air is ejected is approximately within the range of the following equation (1). A method for producing ice having a pattern is disclosed and provided.

(1) 0.07 (kg/cm2)+q<=
P1 ＜=0.12 (kg/cm2)+ q However, q
is the water pressure (kg/cm2) acting on the tip of the air jet tube.
). In the present invention, it is particularly desirable that the air pressure P2 in the air ejection tube when air is not ejected is within the range of the following equation (2). (2) 0 <= P2 <= q Furthermore, the ice-making raw water used in the present invention may contain dissolved components.

0012

EXAMPLE Ice having a striped pattern was produced using an apparatus substantially similar to the conventional apparatus, that is, the apparatus shown in FIG. The freezing can is a standard cube-shaped freezing can with a depth of 11
20mm, bottom long side 545mm, short side 265mm
, the long side of the upper opening is 570 mm, the short side is 290 mm
Ice-making raw water was poured into the container until the water depth reached 1000 mm. In order to stir the raw water, an air jet tube was inserted to a depth of approximately 800 mm from the water surface, and compressed air was intermittently inserted. The dissolved components shown in Table (1) were dissolved in the raw water in the amounts shown in the table.

[0013]

[Table 1]

[0014] Also, during the ice-making process, the temperature of the brine (container in the brine pool) was maintained at -8°C to -10°C. In order to stir the ice-making raw water to form a transparent frozen layer, first
．． Air at a high pressure of 3 kg/cm2 was first blown out for about 1 hour. 1 each while gradually decreasing the pressure.
Stirring and freezing was performed for each hour.

[0015] Although the pressure was measured by inserting a pressure gauge at a position downstream of the pressure regulating valve, the pressure actually acting in the ice-making raw water can be estimated from that value at the air jet tip in the air jet pipe. Acting water pressure q (kg/cm2)
In this example, the air exhaust pipe is inserted up to about 800 mm from the water surface, so the actual value is the water pressure at that point, about 0.08 kg/cm2, subtracted from the pressure gauge value. This is the pressure that acts in the ice-making raw water.

[0016] When the gauge pressure was higher than around 0.2 kg/cm2, a transparent frozen layer was formed, but
The blowing air was so strong that it boiled the water in the freezing can, and the raw water for ice making was discharged into the brine pool. This resulted in brine dilution. In addition, ice formed up to the upper edge of the freezing can, making it difficult for melted water and sprayed water to penetrate along the inner walls of the freezing can during melting and removing ice, impeding ice removal efficiency.

Gauge pressure is approximately 0.15 to 0.2 k
In the case of a range of g/cm 2 , a transparent frozen layer was formed due to extreme blowing up of the ice-making raw water. Gauge pressure is 0
．． In the case of the range of 0.08 to 0.14 kg/cm2, completely opaque ice is produced at 0.08 kg/cm2, and as the pressure is gradually increased, ice with an increased transparent part from the top of the freezing can is produced. Do you get it.

[0018] This means that when the ice-making raw water in the ice-making can flows and freezes due to the air jet, transparent ice is obtained, but if the jet air pressure is low and the circulation is insufficient, there is no ice inside the can. This means that there are areas where the liquid does not flow or where the flow is insufficient, and these areas become opaque or translucent. Next, adjust the gauge pressure to 0.00 to 0.07 kg/
Experiments were conducted in the cm2 range. In this case, the water pressure acting on the tip of the air jet tube is approximately 0.08 kg/cm.
2, substantially no air was blown out and the raw water for ice making was not stirred. Then, an opaque frozen layer was formed, but about 20 to 4
During freezing for 0 minutes, the dissolved substances were almost evenly distributed within the layer, and no deviation occurred.

As can be seen from the above results, the differential pressure obtained by subtracting the water pressure acting on the tip of the air jet tube from the pressure gauge value is approximately 0.07 kg/cm2 to 0.12 kg/cm2.
g/cm2, the most efficient and practical way to form a transparent frozen layer, and it is also possible to freeze the ice without forcing air into the ice-making raw water, that is, without stirring the ice-making raw water. However, an opaque frozen layer was formed in which dissolved substances such as pigments were uniformly dispersed in the raw water.

Table 2 shows that using the above-mentioned standard ice freezing can, the thickness of the transparent freezing layer was made approximately 10 mm by the method of the present invention.
The figure shows the time required for producing ice having a striped pattern consisting of 14 alternating opaque ice layers each having a thickness of about 3.0 mm to 3.5 mm. In the table, O
N is the case where transparent ice is produced by stirring the ice-making raw water with compressed air, and 0FF is the case where opaque ice is produced without stirring the ice-making raw water.

The boundary between the opaque frozen layer and the transparent frozen layer was clear, and the dissolved substances in the opaque frozen layer were almost uniformly distributed. In addition, in this example, ice with a Baumkuchen-like striped pattern was produced, but as the distance from the freezing can decreases the efficiency of cold heat transfer, as shown in the table, it gradually takes longer to form an ice layer of the same thickness. It takes.

[0022]

[Table 2]

[0023]

[Effects of the Invention] Since the present invention produces ice under the conditions set forth in the claims, ice having a striped pattern with clear boundaries can be produced under the most economical conditions. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of an apparatus for producing ice having a striped pattern used in carrying out the present invention.

Claims (3)

[Claims] [Claim 1] An air discharge pipe for blowing out air is provided in the freezing can, and air is intermittently jetted from the air jetting pipe to cool and freeze raw water for ice making in the freezing can. A method for producing ice having a striped pattern, in which the air pressure P1 in the air ejection tube when air is ejected is
Method for producing ice with a striped pattern, characterized by approximately falling within the range of the following formula (1) (1) 0.07 (kg/cm2) + q <=
P1 ＜=0.12 (kg/cm2)+ q However, q
= Water pressure acting on the tip of the air jet tube (kg/cm2
) 2. The method for producing ice having a striped pattern according to claim 1, wherein the air pressure P2 in the air ejection tube when air is not ejected is approximately within the range of the following equation (2). (2) 0 <= P2 <= q 3. The method for producing ice having a striped pattern according to claim 1 or 2, wherein the ice-making raw water contains a dissolved component.