JP3133091B2 - Artificial snow spraying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for spraying powdery artificial snow on a ski slope. More specifically, in order to make a ski slope suitable for skiing, after absorbing water with a water-absorbent resin, it is frozen and made into a powdery snow-like artificial snow, transported by a gas at 0 ° C. or less, and sprayed from over the ski slopes. The present invention relates to an artificial snow spraying method.

[0002]

2. Description of the Related Art Artificial snowfall devices have recently been actively introduced at ski resorts in Japan in order to speed up or extend the gliding season. Artificial snowfall devices are roughly classified into two types: gun type and fan type. The method of making snow with these apparatuses is a method of making fine ice by using adiabatic expansion of compressed air with high-pressure water in an atmosphere of 0 ° C. or lower or using cold air. The artificial snow thus produced contains more than 10% of water and has a density of 0.3-0.4.
g / cm ³ , strength is 1 kg / cm ² or less, and it is not suitable for skiing without pressing snow. Such snow changes its snow quality more rapidly than natural snow.
In some cases, the snow may go up to ~ 5mm. Rough snow is very slippery snow for skiers, so the work of breaking the snow, that is, grooming, must be performed frequently, but it is still not sufficiently effective.

[0003] Artificial snowmaking machines have also been introduced in which water is frozen to form ice blocks and then subjected to a physical impact to be crushed to form ice particles or snowflakes. There is a drawback that only snow can be obtained, and the same measures as described above are taken. Further, in the case of artificial snow made by mixing (water absorbing) a water-swellable material (water-absorbent resin) and water, and then aerating and freezing as disclosed in Japanese Patent Publication No. 2-36635, the snow Density and strength tend to vary depending on aeration conditions and freezing conditions, with a density of 0.4 to 0.9 g / cm ³ and a strength of 10 to several hundreds kg / cm ² . Such snow is more like crushed fine ice or ice burn than snow. The same condition as that of the ice burn must be crushed by applying a physical impact as described above to form ice grains or snowflakes, and only a rough snow-like product can be obtained. Therefore, when making artificial snow using only the water-swellable material, add a surfactant or adjust the particle diameter and water absorption ratio so that frozen particles do not bond more than necessary to make it suitable for skiing. And grooming must be performed frequently. Such snow is very hard to use for ski resorts.

[0004] The water-swellable material (water-absorbent resin) and water are mixed with an artificial slope at an indoor ski resort (weight ratio: about 1).
There is also an artificial ski slope in which a glue-like material (/ 80 to 1/100) is disposed and ice is once formed on the entire surface like a skating rink, and then only the surface is groomed to remove the ice to make artificial snow. In addition to the above-mentioned problem, the indoor ski resort created by this method also has a problem that the stock does not stand because there is an ice layer such as an ice bar under the artificial snow.

[0005]

The conventional ski slope using artificial snow has the following problems. You have to groom. A slope made of artificial snow of any density and strength according to the level and preference of the skier cannot be obtained. Snow quality changes over time, making it difficult to maintain the condition of the slopes. Slope construction and maintenance costs are high. Artificial snow made by freezing from a water-swellable material (water-absorbent resin) and water becomes an ice block, which must be ground once.

[0006]

The inventors of the present invention have conducted intensive studies to solve the conventional problems, and as a result, the object of the present invention is to reduce the construction and maintenance costs of the slopes and to improve the skier's level. An object of the present invention is to provide a method for producing a ski slope made of artificial snow having an arbitrary density and strength according to preference and having little change over time in snow quality.

The invention of claim 1 of the present invention has the following characteristics:
After having been absorbed by the water-absorbent resin, it is frozen, and if it is agglomerated after freezing, it is further crushed, and the powdered snow-like artificial snow is transported by a gas at 0 ° C. or less, and sprayed from above the ski slopes. It is a method of spraying artificial snow. Absorb water
Are also non-adhesive to each other, and
Water absorption capacity is about 30 to 500 times, particle size before water absorption is about
20-500 μm, particle size after water absorption is about 0.05-2 m
m. The invention according to claim 2 of the present invention is the method for scattering artificial snow according to claim 1, wherein a mixture of powdered snow-like artificial snow and crushed dry ice is used. The invention of claim 3 of the present invention provides:
The artificial snow scattering method according to claim 1, wherein the amount of water added to the water-absorbent resin is 100% to 120% of the maximum water-absorbing ability of the water-absorbent resin. The invention of claim 4 of the present invention is an artificial snow spraying method according to claim 1 superabsorbent polymer granules are spherical. The invention of claim 5 of the present invention, superabsorbent polymer granules are, polyacrylate, claim 1 is a copolymer saponified vinyl alcohol and acrylic acid salt copolymer or isobutylene and maleic anhydride The method of spraying artificial snow described in 1 above. According to the invention of claim 6 of the present invention, the spraying nozzle is fixed and / or movable.
4. The artificial snow spraying method according to any one of claims 1 to 3.

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, terpolymers, etc., are mentioned. An aqueous solution of a monomer containing acrylic acid and an ammonium salt or an alkali metal salt of acrylic acid is added with 0.1 to 10% by weight of a polyvalent solution. Add an organometallic ion crosslinking agent, polymerize in aqueous solution, and dry to a moderately crosslinked strip-shaped superabsorbent resin obtained by drying, or a copolymer of acrylic acid and ammonium or alkali metal salt of acrylic acid. Moderately crosslinked strip-shaped superabsorbent resin obtained by post-crosslinking using 0.1 to 10% by weight of a polyvalent organometallic ion crosslinking agent, or a reversed phase in an organic solvent which is granular, especially Polyacrylates obtained by suspension polymerization, copolymers of vinyl alcohol and acrylate or copolymers of isobutylene and maleic anhydride Superabsorbent polymer granules consisting of halides like is preferable. Among these, highly water-absorbent resin particles are particularly preferred.

In order to maintain the fluidity of the superabsorbent resin used in the present invention in the form of particles or flakes even after absorbing water, and to make them non-adherent to each other, a suitable crosslinking agent such as a polyvalent epoxy or a polyvalent amine may be used. Although the degree of cross-linking is increased by using an agent, the water-absorbing ability is reduced if cross-linking is excessive, so it is important to adjust the amount of the cross-linking agent so that the water-absorbing capacity becomes appropriate.

[0010] Granular superabsorbent resins are preferred because they are easy to handle and do not impair ski skiing. Therefore, a spherical superabsorbent resin is more preferable. Further, the highly water-absorbent resin granules of the present invention preferably have a particle size of 0.05 mm to 2 mm after absorbing water, and as a result, a size of 20 to 500 μm before water absorption is suitable. If it is less than 20 μm, the artificial snow becomes too hard and the artificial snow becomes too hard, and if it is more than 500 μm, the artificial snow becomes rough and is not preferable.

The highly water-absorbent resin granules used in the present invention have a water absorption capacity of 30 to 500 times, preferably 50 to 200 times, with respect to ion-exchanged water. When the water absorption capacity is smaller than 30 times, the obtained artificial snow has a low water absorption capacity, so that it becomes difficult to absorb the liquid water generated by the melting of the artificial snow and maintain the snow quality of the target condition. If it is more than 500 times, the gel strength at the time of absorbing water is weak, and it is not preferable because it is easily broken when pressure is applied.

By arbitrarily changing parameters such as the particle diameter of the superabsorbent resin particles, the ratio of water absorption capacity / water absorption capacity, and the amount of water swelling bodies, snow of any density and strength can be obtained. For example, when it is desired to obtain hard and heavy snow quality, the particle size is small (20 to 150 μm), the ratio of water absorption capacity / water absorption capacity is large (30 to 80%), and the amount of water swelling is increased (3).
0 to 200 parts by weight). On the other hand, when soft and light snow is desired to be obtained, the particle size is large (150 to 500 μm), the ratio of water absorption capacity / water absorption capacity is small (10 to 50%), and the amount of water swelling is small (1
0 to 80 parts by weight).

Since these water-swelled bodies usually have a water absorption ratio lower than the maximum water absorption capacity of the highly water-absorbent resin granules,
The artificial snow produced therefrom absorbs the liquid water generated by the rise of the outside air temperature, and can maintain the snow quality of the target condition so as not to change. However, the amount of water added to the superabsorbent resin granules is 100 times the maximum water absorption capacity of the superabsorbent resin granules.
% Or more. Excess water may be removed before freezing the water swelling body to make artificial snow, but water absorbed when freezing the water swelling body and making artificial snow is discharged from the water swelling body. Since snow crystals are formed so as to surround the superabsorbent resin particles, there is no problem even if water exists around the water-swelled body. However, the amount of water added to the highly water-absorbent resin particles is preferably 100% to 120% of the maximum water absorption capacity of the highly water-absorbent resin particles in order to obtain the desired conditions of snow quality. In this case, since the highly water-absorbent resin particles surrounded by the snow crystals have a water absorption ratio lower than the maximum water absorption capacity, this artificial snow also absorbs liquid water generated due to an increase in outside temperature, It has the ability to maintain the snow quality of the target conditions unchanged.

Any method may be used to cause the highly water-absorbent resin particles to absorb water. For example, it is only necessary to put a strip into stirred water and leave it for several minutes, depending on the water absorption ratio. The water absorption rate is affected by the water temperature, and the water absorption rate tends to be slower at a lower temperature and higher at a higher temperature. For example, when the water temperature is 10 ° C. or lower, it is desirable to appropriately heat and absorb the water.

The method of freezing the water-absorbent resin particles is not particularly limited, and artificial snow can be obtained easily and economically without artificial aeration. For example,
A method of freezing the water-absorbent resin granules by stirring them with a known method together with dry ice, liquid nitrogen, liquid air, liquefied carbon dioxide, etc., and absorbing water onto a metal pipe or sheet cooled by a refrigerant. There are a method of placing and cooling the super-absorbent resin granules thus obtained, a method of using the artificial snowfall machine and the artificial snowmaker described above, and any method may be used. However, the artificial snow quality was changed by the freezing method, and the artificial snow obtained by freezing by stirring the superabsorbent resin particles that had absorbed water with dry ice, liquid nitrogen, liquid air, liquefied carbonic acid, etc. was "smooth". Although it can be used as it is because it is powdered snow, artificial snow obtained by cooling the water-absorbent resin particles placed on metal pipes or sheets cooled by a refrigerant is used for confectionery. A "falling goose" -shaped mass is obtained. In this case, the mass is crushed by an appropriate method and used in the form of powder snow.

In the method of freezing using liquid nitrogen, liquid air, liquefied carbonic acid or the like, since these are liquids, they are easily mixed with the water-absorbent resin particles swollen by water absorption, and the vaporizing latent heat effect is utilized. This is a preferable method because the artificial snow species can be efficiently frozen in a short time. Any substance other than liquid nitrogen, liquid air, liquefied carbon dioxide, etc. can be used as long as the substance is the same. However, among them, use of liquefied carbonic acid is preferable in terms of refrigeration effect, economy, 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 15.1 Kcal at 30 ℃
/ Kg, 48.1Kcal / Kg at 10 ° C, 56.1Kcal at 0 ° C
/ Kg, etc., which can be used effectively for cooling and freezing. Liquefied carbon dioxide is produced by compressing and cooling carbon dioxide gas to about 40 atmospheres. The sources of carbon dioxide gas include natural gas and offgas from ammonia plants, offgas from petroleum refining and ethylene cracking, and other chemicals. There are surplus gas and by-product gas from manufacturers and steel makers, and any of them can be used.

In order to arrange the powdered snow-like artificial snow on a slope of a ski resort, the powdery snow-like artificial snow is transported by a gas of 0 ° C. or less and sprayed from above the ski resort slope.
The temperature of artificial snow sprayed on the slopes should be about 0 to -30 ° C, but the size of the slopes, temperature,
It depends on various conditions such as the number of skiers and the level of skiers, and may be appropriately selected. The gas used for transport is not particularly limited, and may be any of air, nitrogen, carbon dioxide, oxygen and the like. It is preferable to select in consideration of ease of handling, safety, economy and the like.

After the superabsorbent resin particles having absorbed water as described above are stirred and frozen with pulverized dry ice to produce artificial snow, they are transported together with the remaining dry ice by a gas at 0 ° C. or lower, and skied. It may be sprayed from the skies. Further, it is also possible to use a mixture of the powdered artificial snow once made and the crushed dry ice. Dry ice has the effect of freezing the water-absorbent resin granules into artificial snow, cooling the artificial snow to maintain an appropriate snow quality, and has an aesthetic effect due to the emission of white smoke. It is preferable that the mixing ratio of dry ice is appropriately determined in consideration of these factors.

The method of spraying the powdered artificial snow from above the ski slope is not particularly limited. For example, artificial snow is conveyed through a pipe by air at 0 ° C or lower from a container containing artificial snow in the form of powdered snow, and the artificial snow is automatically sprayed from above the ski slope by a suitable spraying nozzle or automatically using a machine. Spray. The number of holes of the spray nozzle may be singular or plural. The number of spray nozzles, hole size, shape, distribution, and the like are not particularly limited. The spraying nozzle itself may be fixed to the spraying means, may be movable, or may be partially fixed and partially movable. It is appropriately selected and used in consideration of the size, inclination, unevenness, and the like of the slope. The amount of the artificial snow to be sprayed, the time of spraying, and the time of spraying are not particularly limited. It goes without saying that it is sprayed when making a slope, but it may be sprayed to maintain the slope. Skiers may also spray during the run,
It can be sprayed during shows and demonstrations on the slopes.

The following can be cited as other examples of application. 1. Put snow powder like snow into a container equipped with a device to supply artificial snow at the bottom, load the container on the vehicle to maintain the slope,
A method in which artificial snow is sprayed from the supply device while the slope is maintained. 2. A method of spraying artificial snowfall equipment such as a gun type or a fan type with an apparatus that directly sprays powdery snow-like artificial snow with compressed air at 0 ° C. or less. 3. A method in which the spraying nozzle is fixed to the slope, and is rotatable like a sprinkler to discharge the artificial snow to the sky over the slope to spray. 4. A method of spraying on a slope with a spray nozzle held by a person with or without a container containing artificial snow.

5. As shown in FIG. 1, artificial snow is conveyed from a tank 1 containing artificial snow through a pipe 2 by air (not shown) at 0 ° C. or less,
How to spray from the ski slope. The nozzle 3 is a rail 4 supported from a ceiling 5 of an artificial skiing area by a hanging support 6.
Can be moved in the direction indicated by the arrow. 7 is a guide wire for supporting the pipe 2. In this example, one nozzle 3 is provided, but a plurality of nozzles 3 may be provided. In addition, the nozzle 3 may be made to be able to expand and contract 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 spraying, may be moved to the ceiling side for storage. 6. As shown in FIG. 2, the rail 4 is provided on the slope 9 side, and the artificial snow is transported through the pipe 2 by air (not shown) at 0 ° C. or less, and the artificial snow is moved while moving the nozzle 3 in the direction indicated by the arrow. A method of spraying 8 from above the slope 9.

As described above, the powdered snow-like artificial snow can be used as it is on a slope. An artificial ski resort can be easily constructed by directly using it alone, and maintenance becomes easy. However, it may be used by appropriately blending it with natural snow, artificial snow or ice snow produced by a method other than the present invention. The mixing ratio may be arbitrary. When making the slopes, for example, if the above-mentioned "falling snow-like artificial snow" is laid underneath and the "snow-dried snow-like artificial snow" is scattered on it, and each is made to have an appropriate thickness, it is even better skis This makes it possible to create a slope that is suitable for skiing, and eliminates problems such as stock not standing.

The artificial snow used in the present invention can be separated and recovered by an appropriate method, dried, and reused. Since the superabsorbent resin particles used in the present invention have photodegradability and biodegradability themselves, there is no problem in disposing after use, but especially when early photodegradation or biodegradation is desired, Disintegration, blending known accelerators for biodegradation, catalysts, additives,
You may add, impregnate, apply | coat, etc.

The superabsorbent resin particles used in the present invention may be colored by a known method using pigments, dyes, and the like. Also, known perfumes, fragrances, fragrances, antioxidants, ultraviolet absorbers, fluorescent agents, nucleating agents, extenders, substances having a low coefficient of friction,
Other additives and the like may be added, blended, coated, impregnated, etc. within a range that does not impair the gist of the present invention.

[0026]

EXAMPLES Next, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples.
In the following examples, the water absorption capacity, fluidity, density and strength of artificial snow after freezing are determined by the following operations. (Water absorption capacity for ion exchange water) 0.5 g of dry polymer
Was dispersed in 1 liter of ion-exchanged water, allowed to stand for 24 hours, filtered through a 60-mesh wire gauze, and the weight (W) of the obtained water-swelled body was measured. This value was used as the initial dry polymer (W ₀ ).
It is the value obtained by dividing by. (Fluidity after water absorption) After adding 50 cc of ion-exchanged water to 1.0 g of the dried polymer to completely absorb the water, the water swelled body was observed while moving, and the fluidity was indicated by ○, ×, and Δ. The angle of repose was measured. (Density of artificial snow after freezing) The snow whose volume is known is taken out, weighed, and obtained by dividing the weight by the volume. The unit is g / cm
³ . When the snow is soft, a thin stainless steel box with a known volume can be inserted into the snow cover to remove the volume of the snow. In the case of hard snow, cut the snow into a square with a saw and measure the size with a ruler to calculate the volume.

(Strength of Artificial Snow after Freezing) A weight is dropped on artificial snow using a Kinoshita-type hardness meter, and the drop strength is measured.
The unit is kg / cm ² . Replace the adapter so that the disk sinks into the artificial snow within 7 to 30 mm, and determine the strength from the conversion table.
In the case of dry snow, etc., it was expressed by touch. (Synthesis example of granular water-absorbing polymer) Stirrer, reflux condenser,
500 equipped with a dropping funnel, thermometer and nitrogen gas inlet tube
150 g of deionized water was charged into a ml separable flask, 0.2 g of partially saponified polyvinyl alcohol (GH-23, manufactured by Nippon Synthetic Chemical Co., Ltd.) was added as a dispersant, and the mixture was heated and melted, and then replaced with nitrogen. On the other hand, in an Erlenmeyer flask, 22.5 g of lauryl acrylate / tridecyl mixed ester (LTA manufactured by Osaka Organic Chemical Co., Ltd.), 10.0 g of hydroxyethyl methacrylate, 17.5 g of methyl methacrylate, and azobisdimethylvaleronitrile 1 were added in advance. Then, 0.0 g of the mixture was added and dissolved, and the mixture was added dropwise to the above separable flask over 1 hour under bubbling of nitrogen gas. 65 ° C
For 5 hours to complete the reaction. After cooling, the solid was filtered, washed with water, and dried under reduced pressure to obtain a bead-shaped dispersant. 360.7 g of n-hexane and 4.32 g of the above-mentioned dispersant were charged into a 1000 ml separable flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen gas inlet tube, and the mixture was heated to 50 ° C. and dispersed and dissolved. Was replaced with nitrogen.

Meanwhile, 72.0 g of acrylic acid was previously partially neutralized in an Erlenmeyer flask with 32.2 g of sodium hydroxide dissolved in 103.6 g of deionized water, and 0.24 g of potassium persulfate was further dissolved at room temperature. did. This monomer aqueous solution was dropped into the above separable flask at a stirring speed of 300 rpm over 1 hour under nitrogen gas bubbling,
After refluxing for 2 hours, 0.1 g of a 30% hydrogen peroxide solution was added,
Further, reflux was continued for 1 hour to complete the polymerization. Thereafter, 0.73 g of ethylene glycol diglycidyl ether was added, azeotropic dehydration was performed, and the mixture was filtered and dried under reduced pressure to obtain a white superabsorbent resin granule.

This highly water-absorbent resin granule has an average particle size of 1
It is 00 μm and shows excellent fluidity. When water was absorbed for 19 seconds while stirring in water at room temperature, water was absorbed and swelled 50 times, and the average particle size was 0.4 mm, which also showed excellent fluidity. The highly water-absorbent resin granules swollen by 50 times water absorption were allowed to stand at room temperature for 60 days or more, but could be stably held without releasing water. Water absorption capacity for deionized water is 1
It was 00 times.

(Example of Manufacture of an Artificial Ski Slope) The above superabsorbent resin granules swelled by absorbing water 50 times (temperature of about 19
℃) 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 artificial snow in the shape of a falling goose. The density (g / cm ³ ) and strength (Kg / cm ² ) of the artificial snow in the shape of a falling goose were 0.5. A wooden ski slope with a styrofoam (thickness of about 3 cm) laid out (width about 40 cm, tilt angle about 1)
A dry ice strip of about 20 Kg is sown on a slope section of about ⁰ m and a slope section of about 4 m length and a horizontal section of about 2 m length connected to the slope section. A block (approximately 20 cm in width, approximately 30 cm in length, and approximately 3.3 cm in thickness) was provided and used as a base snow.

Separately, 100 parts by weight of the highly water-absorbent resin particles swollen by absorbing water 50 times and 60 parts by weight of granular dry ice were mixed at room temperature of -8.3 ° C. for about 5 minutes using a mixer. It was frozen to make a dry powdery artificial snow. Using the artificial snow dispersing apparatus shown in FIG. 2, powdery snow-like artificial snow is conveyed through the pipe 2 by air cooled to about −9 ° C., and is scattered over the entire surface of the root snow from above the nozzle 3 to be thick. The slope 9 was laid to about 4 cm.

Under an outside temperature of about 21 ° C., an artificial snow temperature of about −10
The skiing properties of the skis were examined at -30 ° C. As a result, the gliding performance was excellent, and the acceleration was almost the same as that of natural powdered snow. Even if the temperature of the artificial snow fluctuates from about -10 to -30 ° C, or if the surface of the artificial snow melts to some extent to form a gel, the sliding properties are excellent. The slopes could not be climbed without stock. Stock pierced the slopes easily. The edges of the ski were easy to hit. Also, when I stepped on the skis, it sounded squeaky and comfortable. When the surface of the artificial snow melts and turns into a gel, a suitable amount of granular dry ice can be mixed to make it dry again, and by repeating this, the slope will be kept in good condition for a long time. Could be maintained.

[0033]

According to the present invention, the highly water-absorbent resin granules are allowed to absorb water and then frozen, and when agglomerated after freezing, are further pulverized to produce powdered snow-like artificial snow at a temperature of 0 ° C. or less. It is intended to provide a method of spraying artificial snow that is transported by skiing and spraying from the sky above the ski slopes, has low construction costs and maintenance costs of the slopes, and has an arbitrary density and strength according to the skier's level and preference. In addition, it is possible to produce a ski slope made of artificial snow with little change in snow quality with time.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an artificial snow scattering method according to the present invention.

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

[Description of Signs] 1 Tank 2 Pipe 3 Nozzle 4 Rail 5 Ceiling 6 Suspension bracket 7 Wire 8 Artificial snow 9 Slope

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahisa Otsuka 2-15-17, Jonouchi, Oizumi-cho, Euraku-gun, Gunma Prefecture (72) Inventor Shungo Nagai 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-B2-36635 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25C 3/04 C09K 3/24

Claims (6)

(57) [Claims] 1. A water-absorbent resin having the following properties is made to absorb water, then frozen, and, if it is agglomerated after freezing, further crushed to form a powdery snow-like artificial snow by a gas at 0 ° C. or lower. Then, artificial snow is sprayed from the ski slope. Even if it absorbs water, it remains granular and non-adhesive to each other.
The water absorption capacity of ion-exchanged water is about 30 to 500 times, the particle size before water absorption is about 20 to 500 μm, and the particle size after water absorption is about 0.05 to 2 mm. 2. The method for spraying artificial snow according to claim 1, wherein a mixture of powdered dry snow and powdered artificial snow is used. 3. The method of claim 1, wherein the amount of water added to the water-absorbent resin is 100% to 120% of the maximum water-absorbing capacity of the water-absorbent resin. 4. The highly water-absorbent resin particles are spherical.
2. The artificial snow spraying method according to 1. 5. The highly water-absorbent resin particulate material is polyacrylic acid.
Salt, vinyl alcohol and acrylate copolymer or
A saponified copolymer of sobutylene and maleic anhydride
The artificial snow spraying method according to claim 1. 6. The spraying nozzle is fixed and / or
4. The method according to claim 1, wherein the movable member is movable.
How to spray artificial snow.