JPH04288465A - Artificial snow dispersion method - Google Patents

Abstract

PURPOSE:To get a slope having a less aging variation in snow quality by a method wherein water absorption resin absorbs water, then this resin is frozen, block-like resins are broken after freezing and powder snow are transported with gas with 0 deg.C or less and they are dispersed from above the slope at a ski site. CONSTITUTION:Artificial snow is transported from a tank 1 having artificial snow stored therein through a pipe 2 with air of 0 deg.C or less, the artificial snow 8 is dispersed from holes of a nozzle 3 from above a slope so as to make an artificial ski site. The nozzle 3 is disposed in such a way as it may be moved along a rail 4 supported from a ceiling 5 at the artificial ski site with hanger elements 6. The artificial snow absorbs water into water absorption substance, thereafter the snow is frozen and some snow of block form after freezing are further broken into powder snow. At this time, broken dry ices can be mixed with the artificial powder snow. In addition, the water absorbing resin keeps its particle form even if it absorbs water and shows a non-adhesive characteristics and a high water absorption resin particle with a water absorption power being about 30 to 500 times of that of ion exchanging water, for example, polyacrylic acid salt may be used.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of scattering artificial snow in the form of powder onto a ski slope. More specifically, in order to create ski slopes suitable for skiing, water is absorbed into a water-absorbing resin and then frozen to form powder-like artificial snow, which is then transported by gas at temperatures below 0°C and sprayed from above the ski resort slopes. This relates to an artificial snow spreading method.

0002

2. Description of the Related Art Artificial snow-making devices have recently been increasingly introduced at ski resorts in Japan in order to hasten or extend the skiing season. There are two types of artificial snowmaking devices: gun type and fan type. The method for making snow using these devices is to use adiabatic expansion of compressed air with high-pressure water in the atmosphere below 0°C, or use cold air to make fine ice. The artificial snow made in this way contains more than 10% water and has a density of 0.3 to 0.4.
g/cm3, and the strength is less than 1 kg/cm2, making it unsuitable for skiing unless the snow is compacted. In addition, the quality of such snow changes more rapidly than natural snow, and after several days, it may progress to coarse snow with an outer diameter of about 1 to 5 mm. Rough snow is extremely difficult for skiers to slip on, and therefore, the work of breaking up the snow, that is, grooming, must be performed frequently, but even this cannot be said to be sufficiently effective.

[0003] Artificial snow-making machines have also been introduced that freeze water into ice blocks and apply physical impact to crush them into ice particles or snowflakes, but these machines also produce difficult snow types such as shaved ice or snow flakes. The drawback is that only rough snow can be obtained, so the same countermeasures as mentioned above are taken. In addition, in the case of artificial snow, which is made by mixing water-swellable material (water-absorbing resin) and water (absorbing water), aerating and freezing the snow, as disclosed in Japanese Patent Publication No. 2-36635, Density and strength tend to vary depending on aeration conditions and freezing conditions, and the density is 0.4 to 0.9 g/cm3,
The strength is 10 to several 100 kg/cm2. Such snow is more like rough, fine ice or ice burn than snow. If it is in the same state as an ice burn, it must be crushed into ice grains or snowflakes by applying a physical impact as described above, and only a rough snow-like material can be obtained. Therefore, when making artificial snow using only water-swellable materials,
To make it suitable for skiing, it is necessary to add surfactants, adjust the particle size and water absorption ratio, and perform frequent grooming to prevent frozen particles from bonding together more than necessary. . Such snow can be said to be extremely difficult to use at ski resorts.

[0004] Also, the water-swellable material (water-absorbing resin) and water are mixed (weight ratio: about 1) on the artificial slope of an indoor ski resort.
There are also artificial ski slopes where a glue-like material made of 1/80 to 1/100) is placed to freeze the entire surface, like a skating rink, and then only the surface is groomed to scrape off the ice to create artificial snow. In addition to the problems mentioned above, indoor ski resorts built using this method also have other problems, such as the fact that there is a layer of ice underneath the artificial snow, making it difficult for ski poles to stand.

[0005]

[Problems to be Solved by the Invention] Conventional ski slopes using artificial snow have the following problems. ■ Must be groomed. ■It is not possible to obtain slopes made of artificial snow of arbitrary density and strength depending on the skier's level and preference. ■Snow quality changes significantly over time, making it difficult to maintain the condition of the slopes. ■Slope construction and maintenance costs are high. ■Artificial snow that is made by freezing water and water-swellable materials (water-absorbing resin) turns into blocks of ice, which must first be crushed.

[0006]

[Means for Solving the Problems] As a result of intensive research by the present inventors to solve the conventional problems, the purpose of the present invention is to reduce the construction and maintenance costs of ski slopes, and to improve the level of skiers. To provide a method for manufacturing a ski resort slope made of artificial snow having arbitrary density and strength according to preference and with little change in snow quality over time.

[0007] The invention of claim 1 of the present invention is to absorb water into a water-absorbing resin, freeze it, and if it becomes lumpy after freezing, further crush it to make powdery artificial snow, which is then heated to a temperature below 0°C. This is a method of dispersing artificial snow by transporting it with gas and dispersing it from above the ski slopes. The invention according to claim 2 of the present invention is the artificial snow spreading method according to claim 1, which uses a mixture of powdery artificial snow and crushed dry ice. The invention according to claim 3 of the present invention is characterized in that the amount of water added to the water absorbent resin is 100% to 120% of the maximum water absorption capacity of the water absorbent resin.
This is the artificial snow spreading method described in . A fourth aspect of the present invention is the artificial snow spreading method according to any one of claims 1 to 3, in which the water absorbent resin comprises super absorbent resin granules having the following characteristics. ■Even when water is absorbed, it remains granular and non-adhesive to each other; ■Water absorption capacity for ion-exchanged water is about 30 to 50.
0 times, ■ Particle size before water absorption is about 20 to 500 μm, ■ Particle size after water absorption is about 0.05 to 2 mm. The fifth aspect of the present invention is the artificial snow spreading method according to the fourth aspect, wherein the super absorbent resin particles are spherical. The invention of claim 6 of the present invention is that the super absorbent resin granules are a saponified product of polyacrylate, a copolymer of vinyl alcohol and acrylate, or a copolymer of isobutylene and maleic anhydride. This is the artificial snow spreading method described in . The invention of claim 7 of the present invention is:
4. The artificial snow spreading method according to claim 1, wherein the spreading nozzle is fixed and/or movable.

The water-absorbing resin used in the present invention includes starch, cellulose, acrylamide, acrylic acid, acrylate, methacrylate, styrene,
Synthetic resin systems such as polymers such as vinyl ethers, copolymers, and terpolymers can be mentioned, but 0.1 to 10% by weight of polyhydric Appropriately crosslinked flaky superabsorbent resin obtained by adding an organometallic ion crosslinking agent, polymerizing in aqueous solution, and drying, or a copolymer of acrylic acid and an ammonium salt or alkali metal salt of acrylic acid. 0.1-10% by weight
Moderately crosslinked superabsorbent resins in the form of strips obtained by post-crosslinking using a polyvalent organometallic ion crosslinking agent, or particularly granular superabsorbent resins obtained by reverse phase suspension polymerization in an organic solvent. Suitable are superabsorbent resin particles made of polyacrylate, a copolymer of vinyl alcohol and acrylate, or a saponified copolymer of isobutylene and maleic anhydride. Among these, super absorbent resin particles are particularly preferred.

[0009] In order to maintain fluidity in the form of particles or strips even after the superabsorbent resin used in the present invention absorbs water and to make them non-adhesive to each other, appropriate crosslinking such as polyvalent epoxy or polyvalent amine is used. Although a crosslinking agent is used to increase the degree of crosslinking, excessive crosslinking lowers the water absorption capacity, so it is important to adjust the amount of crosslinking agent to obtain an appropriate water absorption capacity.

[0010] Particulate super absorbent resins are preferred because they are easy to handle and do not make skis slippery. Therefore, a spherical superabsorbent resin is more preferable. Furthermore, the superabsorbent resin particles of the present invention preferably have a particle size of 0.05 mm to 2 mm after absorbing water, and as a result, a particle size of 20 to 500 μm before absorbing water is suitable. If it is less than 20 μm, it will be too fine and the artificial snow will become too hard, and if it is more than 500 μm, the artificial snow will become rough and undesirable.

The superabsorbent resin particles used in the present invention have a water absorption capacity of 30 to 500 times, preferably 50 to 200 times, relative to ion-exchanged water. If the water absorption capacity is less than 30 times, the water absorption capacity of the obtained artificial snow will be low, making it difficult to maintain the desired snow quality by absorbing liquid water generated when the artificial snow melts. If it is larger than 500 times, the gel strength will be weak when water is absorbed, and it will be easily broken when pressure is applied, which is not preferable.

[0012] By arbitrarily changing parameters such as the particle diameter of the super-absorbent resin granules, the ratio of water absorption capacity/water absorption capacity, and the amount of water-swollen material, snow of arbitrary density and strength can be obtained. For example, if you want to obtain hard and heavy snow, the particle size should be small (20 to 150 μm), the ratio of water absorption capacity/water absorption capacity should be large (30 to 80%), and the amount of water-swelled material should be large (
30-200 parts by weight). On the other hand, if you want to get soft and light snow, use large particle size (150 to 500 μm) and water absorption capacity /
The ratio of water absorption capacity may be small (10 to 50%) and the amount of water-swollen material may be small (10 to 80 parts by weight).

[0013] Furthermore, since these water-swellable bodies usually have a water absorption capacity lower than the maximum water absorption capacity of the super absorbent resin granules,
The artificial snow made from it absorbs the liquid water generated by the rise in outside temperature, and can maintain the desired snow quality so that it does not change. However, the amount of water added to the super absorbent resin granules is 100% of the maximum water absorption capacity of the super absorbent resin granules.
% or more. Excess water may be removed before freezing the water-swollen material to make artificial snow, but the water absorbed when freezing the water-swollen material to make artificial snow is discharged from the water-swollen material. Since snow crystals are formed surrounding the superabsorbent resin granules, there is no problem even if water is present around the water-swollen material. However, in order to obtain the desired snow quality, the amount of water added to the superabsorbent resin granules is preferably 100% to 120% of the maximum water absorption capacity of the superabsorbent resin granules. In this case, the superabsorbent resin granules surrounded by snow crystals have a water absorption capacity lower than their maximum water absorption capacity, so this artificial snow also absorbs liquid water generated by the rise in outside temperature. It has the ability to maintain the desired snow quality so that it does not change.

[0014] Any method may be used to make the super absorbent resin granules absorb water; for example, it is sufficient to simply throw the pieces into stirred water and leave them for several minutes, depending on the water absorption capacity. The water absorption rate is affected by the water temperature, and the water absorption rate tends to be slow at low temperatures and faster at higher temperatures. For example, when the water temperature is 10° C. or lower, it is desirable to appropriately heat the water to absorb water.

[0015] The method of freezing the water-absorbed superabsorbent resin granules is not particularly limited, and artificial snow can be obtained easily and economically without artificial aeration. for example,
A method of freezing water-absorbing superabsorbent resin granules by stirring them with dry ice, liquid nitrogen, liquid air, liquefied carbon dioxide, etc. using a known method, or freezing the superabsorbent resin particles by placing them on a metal pipe or sheet cooled by a refrigerant. There are a method of placing and cooling super absorbent resin granules, a method of using the above-mentioned artificial snowmaking machine, artificial snowmaking machine, etc., and any method may be used. However, the quality of artificial snow changes depending on the freezing method, and the super absorbent resin granules that have absorbed water are mixed with dry ice, liquid nitrogen, liquid air,
Artificial snow obtained by freezing by stirring with liquefied carbonic acid, etc. is a "smooth" powder-like material that can be used as is, but it can be used directly on metal pipes or sheets that have been cooled with a refrigerant to absorb water. Artificial snow obtained by placing superabsorbent resin granules and cooling them yields lumps shaped like "Rakugan" of sweets, so in this case, they are crushed by an appropriate method and used as powdered snow.

[0016] In the freezing method using liquid nitrogen, liquid air, liquefied carbonic acid, etc., since these are liquids, they are easy to mix with the super absorbent resin particles that have been swollen by absorbing water, and take advantage of their latent heat of vaporization effect. This is a preferred method because it allows the artificial snow species to be frozen efficiently in a short period of time. Substances other than liquid nitrogen, liquid air, liquefied carbonate, etc. can be used as long as they have the same effect. However, among these, the use of liquefied carbonic acid is preferable in terms of freezing effect, economical efficiency, easy availability, ease of handling, and the like.

Commercially available liquefied carbonic acid can be used. The latent heat of vaporization of liquefied carbonic acid is 15.1Kc at 30℃
al/Kg, 48.1Kcal/Kg at 10℃, 0
It has a value of 56.1 Kcal/Kg at ℃, and can be effectively used for cooling and freezing. Liquefied carbonic acid has carbon dioxide gas of about 4
It is produced by compressing it to 0 atmospheres and cooling it. Sources of carbon dioxide gas include off-gas from natural gas and ammonia plants, off-gas from petroleum refining and ethylene cracking, and other surplus gas from chemical and steel manufacturers. and by-product gas, and any of them can be used.

In order to place powdery artificial snow on the slopes of ski resorts, the powdery artificial snow is transported by gas at a temperature of 0° C. or lower and is dispersed from above the ski resort slopes. It is best to keep the temperature of the artificial snow sprinkled on the ski slopes at about 0 to -30℃, but depending on the size of the slope, temperature,
It varies depending on various conditions such as the number of skiers and the level of skiers, so it is best to select it appropriately. The gas used for transportation is not particularly limited, and may be air, nitrogen, carbon dioxide, oxygen, or the like. It is preferable to select it considering ease of handling, safety, economic efficiency, etc.

[0019] After the water-absorbing superabsorbent resin granules are stirred and frozen with crushed dry ice to make artificial snow as described above, they are conveyed together with the remaining dry ice using gas at a temperature of 0°C or lower, and then transported to a ski resort. It may be sprayed from above the ski slope. It is also possible to mix crushed dry ice with the powdered artificial snow that has already been made. Dry ice has the effect of freezing superabsorbent resin granules that have absorbed water to make artificial snow, cooling artificial snow to maintain appropriate snow quality, and emitting white smoke, which has an aesthetic effect. It is preferable to appropriately determine the mixing ratio of dry ice in consideration of these factors.

The method of scattering powdery artificial snow from above the ski slope is not particularly limited either. For example, from a container containing artificial snow in the form of powder, the artificial snow is transported through a pipe using air at temperatures below 0 degrees Celsius, and then the artificial snow is distributed from an appropriate spray nozzle over the ski slope either manually or automatically using a machine. Spread. The number of holes in the spray nozzle may be singular or plural. The number of spray nozzles, hole size, shape, distribution, etc. are also not particularly limited. The spraying nozzle itself may be fixed to the spraying means, movable, or partially fixed and partially movable. Select and use the slope appropriately, taking into account the size, slope, unevenness, etc. of the slope. The amount of artificial snow to be applied, the period of application, the time of application, etc. are not particularly limited. Of course, it can be sprayed when creating a ski slope, but it may also be sprayed to maintain the slope. It can also be sprayed by skiers while skiing, or during shows or demonstrations on the slopes.

Other examples of dispersion include the following. 1. Powdered artificial snow is placed in a container with an artificial snow supply device at the bottom, and the container is loaded onto a vehicle that maintains the slopes.
A method of distributing artificial snow from a supply device in parallel with ski slope maintenance. 2. A method of spreading artificial snow in the form of powder by attaching a device to an artificial snow-making device such as a gun type or a fan type to directly spread artificial snow using compressed air at a temperature below 0°C. 3. A method of spraying artificial snow by fixing it on the slope and rotating it like a sprinkler to release artificial snow into the sky above the slope. 4. A method of spraying snow onto the slopes using a spray nozzle held in the hand, with or without a person holding a container filled with artificial snow.

5. As shown in Figure 1, a method in which artificial snow is conveyed from a tank 1 containing artificial snow through a pipe 2 using air (not shown) at a temperature below 0°C, and artificial snow 8 is dispersed from above the ski slope through a hole in a nozzle 3. . The nozzle 3 is movable in the direction shown by the arrow along a rail 4 supported by a hanging support 6 from the ceiling 5 of the artificial ski resort. 7 is a guide wire that supports the pipe 2. In this example, there is one nozzle 3, but a plurality of nozzles 3 may be provided. Further, the nozzle 3 may be extendable and retractable in the direction of the slope, and when spraying artificial snow, the nozzle 3 may be moved to the vicinity of the slope, and after being sprayed, it may be moved to the ceiling side and stored. 6. As shown in FIG. 2, the rail 4 is installed on the ski slope 9 side, and the artificial snow is conveyed through the pipe 2 by air (not shown) at a temperature of 0°C or lower, and the nozzle 3 is moved in the direction shown by the arrow. How to spray 8 from above ski slope 9.

[0023] As described above, the powdery artificial snow can be used as is on the slopes. By directly using it alone, it is possible to easily create an artificial ski resort, and it is also easy to maintain. However, it may be used in combination with natural snow, artificial snow made by a method other than the present invention, ice and snow, etc. as appropriate. The blending ratio may be arbitrary. When building a ski slope, for example, if you lay down the above-mentioned ``artificial snow in the shape of a falling wild goose'' and sprinkle ``artificial snow in the form of smooth powder'' on top of it, each layer having an appropriate thickness, you can create even better skis. This allows you to create a slope suitable for the ski slopes, and eliminates problems such as not being able to stock up on skis.

The artificial snow used in the present invention can be separated and collected by an appropriate method, dried, etc., and reused. The superabsorbent resin granules used in the present invention are themselves photodegradable and biodegradable, so there is no problem in disposing of them after use. Known accelerators, catalysts, additives, etc. for disintegration and biodegradation may be blended, added, impregnated, coated, etc.

The superabsorbent resin particles used in the present invention may be colored by a known method using pigments, dyes, etc. In addition, known perfumes, fragrances, perfumes, antioxidants, ultraviolet absorbers, fluorescent agents, nucleating agents, fillers, substances with a low coefficient of friction, and other additives may be used within the scope of the invention. It may be added, blended, coated, impregnated, etc.

[0026]

[Examples] Next, the present invention will be specifically explained by examples, but the present invention is not limited to these examples. In addition, the water absorption capacity, fluidity, density and strength of artificial snow after freezing in the following examples are determined by the following operations. (Water absorption capacity for ion-exchanged water) Dry polymer 0.5g
was dispersed in 1 liter of ion-exchanged water, left to stand for 24 hours, and then filtered through a 60-mesh wire mesh to measure the resulting water-swollen weight (W), and this value was compared to the initial dry polymer (W0).
) is the value obtained by dividing by (Fluidity after water absorption) After 50 cc of ion-exchanged water was added to 1.0 g of dry polymer and all water was absorbed, the water-swollen body was observed while moving, and the fluidity was indicated by ◯, ×, or △. The angle of repose was measured. (Density of artificial snow after freezing) Take the snow whose volume is known, weigh it, and divide the weight by the volume. Unit is g/cm
3. When the snow is soft, you can remove a volume of snow by inserting a thin stainless steel box with a known volume into the snow. For hard snow, cut the snow into squares with a saw, measure the dimensions with a ruler, and calculate the volume.

(Strength of artificial snow after freezing) A weight is dropped onto the artificial snow using a Kinoshita hardness tester to measure the falling strength. The unit is kg/cm2. The sinking of the disc into the artificial snow is 7-30
Replace the adapter so that it fits in mm, and find the strength from the conversion table. In the case of soft snow, etc., it was expressed by feel. (Example of synthesis of granular water-absorbing polymer) Stirrer, reflux condenser,
500 with dropping funnel, thermometer and nitrogen gas inlet tube
ml separable flask was charged with 150 g of deionized water, 0.2 g of partially saponified polyvinyl alcohol (GH-23, manufactured by Nippon Gosei Kagaku Co., Ltd.) was added as a dispersant, heated and melted, and then replaced with nitrogen. Meanwhile, in an Erlenmeyer flask, add 22.5 g of lauryl acrylate and tridecyl mixed ester (LTA, manufactured by Osaka Organic Chemical Co., Ltd.), 10.0 g of hydroxyethyl methacrylate, 17.5 g of methyl methacrylate, and 1 part of azobisdimethylvaleronitrile. ．．
0 g was added and dissolved, and the solution was added dropwise to the above-mentioned separable flask over 1 hour under nitrogen bubbling. 5 at 65℃
Hold for a period of time to complete the reaction, filter the solid after cooling,
After washing with water, it was dried under reduced pressure to obtain a bead-like dispersant. In a 1000 ml separable flask equipped with a stirrer, reflux condenser, dropping funnel, thermometer and nitrogen gas inlet tube, 360.7 g of n-hexane and 4.32 g of the above dispersant were charged.
After the temperature was raised to 50°C to disperse and dissolve, the atmosphere was replaced with nitrogen.

On the other hand, in an Erlenmeyer flask, 72.0 g of acrylic acid was partially neutralized with 32.2 g of sodium hydroxide dissolved in 103.6 g of deionized water, and then 0.24 g of potassium persulfate was further dissolved at room temperature. did. This monomer aqueous solution was added dropwise to the above separable flask at a stirring speed of 300 rpm over a period of 1 hour under nitrogen bubbling.
After refluxing for 2 hours, 0.1 g of 30% hydrogen peroxide solution was added,
Refluxing was further continued for 1 hour to complete the polymerization. Thereafter, 0.73 g of ethylene glycol diglycidyl ether was added, followed by azeotropic dehydration, filtration, and drying under reduced pressure to obtain white superabsorbent resin particles.

[0029] This super absorbent resin granule has an average particle size of 1
00 μm and exhibits excellent fluidity. When it was allowed to absorb water for 19 seconds while stirring in water at room temperature, it absorbed 50 times more water and swelled, with an average particle size of 0.4 mm, which also showed excellent fluidity. The superabsorbent resin granules that had been swollen by absorbing 50 times more water were allowed to stand at room temperature for more than 60 days, but were able to be stably maintained without being drained of water. Water absorption capacity for deionized water is 1
It was 00 times.

(Example of manufacturing an artificial ski slope) The superabsorbent resin granules were swollen by absorbing 50 times more water (at a temperature of about 19
°C) in a wooden case (width 20cm, length 30cm, depth 3
cm) and frozen in a freezer at -30°C for about 1 to 2 hours to make a falling wild goose-shaped artificial snow. The density (g/cm3) of this rakugan-shaped artificial snow is 0.5, the strength (Kg/cm3)
2) was 10. Styrofoam (about 3cm thick)
) wooden artificial ski slope (width approx. 40cm)
Approximately 20 kg of dry ice chips were sown on top of the slope (consisting of a slope section with an inclination angle of about 100 degrees and a length of about 4 m and a continuous horizontal section of about 2 m in length), and on top of that, the above-mentioned rakugan shape was spread over the entire surface. Artificial snow block (width approx. 20cm, length approx. 3cm)
0 cm, thickness of approximately 3.3 cm) was placed as root snow.

Separately, 100 parts by weight of the superabsorbent resin granules, which had been swollen by absorbing water 50 times, and 60 parts by weight of granular dry ice were mixed for about 5 minutes using a mixer at room temperature of -8.3°C. We froze it to create smooth, powder-like artificial snow. Using the artificial snow spreading device shown in Fig. 2, powdered artificial snow is conveyed through pipe 2 using air cooled to approximately -9°C, and is spread from above the nozzle 3 over the entire surface of the root snow to thicken it. Slope 9 was created by laying the ground to a depth of about 4 cm.

[0032] Outside temperature of about 21°C, artificial snow temperature of about -10
The glide properties of skis were examined at -30°C. As a result, the snow had excellent gliding properties, and its acceleration was roughly the same as that of natural powder snow. Even if the temperature of the artificial snow varied from about -10 to -30°C, or even if the surface snow of the artificial snow melted to some extent and turned into gel, the sliding properties were excellent. I couldn't climb the slopes without using ski poles. The stock stuck easily to the ski slope. It was easy to edge the skis. It also made a nice crunching sound when I stepped on it with my skis. When the surface snow of artificial snow melts to a certain extent and becomes a gel, mixing an appropriate amount of granular dry ice can make it smooth and powdery again, and by repeating this process, the ski slope can be kept in good condition for a long time. I was able to maintain it.

[0033]

Effects of the Invention The present invention allows super absorbent resin granules to absorb water, freeze it, and if it becomes lumpy after freezing, further crush it to make powdery artificial snow. This method provides an artificial snow dispersion method in which artificial snow is transported from above the ski resort slopes, and the construction and maintenance costs for the slopes are low, and the density and strength can be adjusted to suit the level and preference of the skier. Moreover, it is possible to manufacture a ski resort slope made of artificial snow whose snow quality changes little over time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the artificial snow spreading method of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the artificial snow spreading method of the present invention.

[Explanation of symbols]

1 Tank 2 Pipe 3 Nozzle 4 Rail 5 Ceiling 6 Hanging support 7 Wire 8. Artificial snow 9 Slope

Claims (7)

[Claims] [Claim 1] After absorbing water into a water-absorbing resin, freezing it,
An artificial snow dispersion method in which if it has formed into clumps after freezing, it is further pulverized to form powdered artificial snow, which is transported by gas at 0°C or lower and then dispersed from above the ski slope. 2. The artificial snow spreading method according to claim 1, wherein a mixture of powdered artificial snow and crushed dry ice is used. 3. The artificial snow spreading method according to claim 1, wherein the amount of water added to the water absorbent resin is 100% to 120% of the maximum water absorption capacity of the water absorbent resin. 4. The artificial snow spreading method according to claim 1, wherein the water-absorbing resin comprises super-absorbent resin granules having the following characteristics. ■Even when water is absorbed, it remains granular and non-adhesive to each other; ■Water absorption capacity for ion-exchanged water is approximately 30 ~
500 times, ■ Particle size before water absorption is about 20 to 500 μm, ■ Particle size after water absorption is about 0.05 to 2 mm. 5. The artificial snow spreading method according to claim 4, wherein the super absorbent resin granules are spherical. 6. The artificial snow according to claim 4, wherein the super absorbent resin granules are a saponified product of polyacrylate, a copolymer of vinyl alcohol and acrylate, or a copolymer of isobutylene and maleic anhydride. Spraying method. 7. The artificial snow spreading method according to claim 1, wherein the spreading nozzle is a fixed one and/or a movable one.