JP2005333932A - Pneumatic membranaceous layer-forming lining curtain film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agricultural film excellent in light transmitting properties and heat insulating properties, having a pneumatic membranaceous air layer-forming function and an air-exhausting and winding-up function in accordance with necessity, and capable of being formed into a compact shape, when put in a distribution process and stored. <P>SOLUTION: This pneumatic membranaceous layer-forming agricultural film is given by using a film formed out of a polyolefin-based resin or a polyvinyl chloride resin as a raw material, forming two sheets of the films into a tube shape, distributing many air vent holes over the formed tube part 6, and positioning an air blasting opening 4 therein, wherein the film has a light transmittance of ≥ 80%, one of surfaces of the film is subjected to anti-fogging treatment, and surfaces 1 of exhibiting an anti-fogging function in the two sheets of the films are overlaid in the forward direction in the formed tube shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air film-lined curtain film used in a cultivation house and a technique for using the same.

In the house for cultivation, several measures have been taken for the purpose of preventing the night temperature in the house from decreasing and saving heating costs. The typical ones are listed below.
As a first measure, it is known that an agricultural film of polyolefin resin or vinyl chloride resin kneaded with an antifogging agent having a transmissivity of 85% or more is used to coat the inner surface of the house. In addition, a technique for preventing the temperature drop in the house at night by flowing groundwater on the lining curtain film has been developed for the purpose of improving the heat retention at night.
Further, as a second measure, a method of saving heating costs and preventing a decrease in room temperature at night has been developed by using a film obtained by kneading or vapor-depositing aluminum or titanium oxide on the inner surface of the house.
As a third measure, a heat insulation method has been devised in which independent polyethylene tubes are arranged side by side in the house, air is blown through the tubes, and heat retention and airtightness are created by the expansion of the tubes. With this method, if air is released, a gap is created between the tubes and air permeability can be obtained.Therefore, when the inside of the house becomes too hot and humid, it has a function that can take in outside air as necessary. It is provided.
As a fourth measure, an agricultural film made of polyethylene and molded into a harmonica shape having a rectangular cross section has been developed and used as a lining curtain.
As a fifth measure, the structure of the house is double-coated, and air is blown in the middle to create an air film layer, thereby reinforcing the house structure supported by aggregates and improving heat retention. An air membrane house with the functions of has been developed.
Patent Document 1 discloses a “greenhouse thermal insulation method and thermal insulation device” in which a lower vinyl is installed on a vinyl support, and one or more thermal air mats are installed on the lower vinyl. A heat insulating exterior part is formed, an upper vinyl is placed on a heat retaining air mat, and a heat insulating intermediate layer part is formed between the upper and lower vinyls.
As described above, various measures are being presented.

However, the above-described technology already developed has the following problems. That is, the single use of the transparent lining curtain, which is the first measure, is popular because it is simple and excellent in workability, storage, and economy in the house, but is far more popular than the outer lining film. Since a film having a low infrared heat absorption property is used, there is a drawback that it is difficult to secure the minimum room temperature necessary for crop cultivation and that heating costs are high. Double or triple use is effective in saving heating costs and ensuring a minimum room temperature, but has the disadvantage of reducing the light transmittance in the house during winter. Moreover, this method not only increases the installation cost of the curtain, but also has the disadvantage that the necessary equipment installed in the house for installation reduces the light transmittance in the house and increases the shadow, so it is not widely used. .
In addition, in the method of flowing groundwater, groundwater is used, so that the heat retention is good, but there is a problem that the humidity in the house becomes high and an environment that easily becomes a hotbed of pathogenic bacteria is created. In addition, there is a problem that the curtain is colored reddish brown due to iron rust contained in the groundwater, the translucency is deteriorated, and light transmission into the house is lowered.

  In addition, when a film using aluminum or titanium oxide, which is the second measure, is used, high heat retention can be easily secured without being bulky, and heating costs can be reduced by about 40% compared to using a transparent lining curtain. However, because it is a material that does not transmit light, it needs to be opened during the day and closed at sunset, and on warm days it will be less warm at room temperature. was there. In addition, during snowfall, the room temperature at the top of the house does not rise, so that it is difficult for the snow to thaw and it is easy for snow to accumulate on the house. The use of this type of thermal insulation material has caused damages such as the house collapsed due to the weight of snowfall.

  In addition, the third measure, the lining curtain type with independent polyethylene tubes installed side by side, is highly heat-insulating with air, has high heat-retaining properties, and has a light-transmitting property. Compared to a single curtain film, the installation of each tube is time consuming and labor intensive, and the equipment costs are high. In addition, when not in use, a tube from which air has fallen hangs down in the house, hindering the transmission of light and having a poor appearance.

The fourth measure, the lining curtain type made of polyethylene and shaped like a harmonica with a rectangular cross section, is too bulky at the distribution stage and has the disadvantage of increasing transportation and storage costs. Condensation is likely to occur on the upper inner surface, light transmission is impaired, and because of the use of curtains, there is a disadvantage that the shadow becomes too large in the house, which is not widespread.
The fifth measure, which is to coat the outer wall of the house with a double coating and create an air film layer by blowing air in the middle, has a night heat retention compared to a single coating, with no heating at night. Although the minimum room temperature is about 2 ° C higher, it has high performance in terms of heat retention at night, but the daytime maximum room temperature is about 5 ° C higher and the daytime temperature is too high. In addition, there is a problem that when the installation requires frequent temperature control at the beginning of spring or autumn, it is not possible to cope with climate change only by ventilation operation on the side of the house. In addition, since two films are fixedly coated, the light transmission energy is reduced, which is not suitable for cultivation of crops that require a lot of light.
Furthermore, although the thing of patent document 1 has a large heat insulation effect, since it takes the structure which interposes an air mat between two agricultural PO films (registered trademark of Toago Kosan Co., Ltd. and 4 other companies), translucency is good. It is bad and there is no adjustment function when the temperature becomes too high.
Japanese Patent Laid-Open No. 2002-58355 “Heat insulation method and heat insulation apparatus for a greenhouse” Published on February 26, 2002

  The problem to be solved by the present invention is excellent in translucency and heat insulation, and has an air film formation and exhaust hoisting function as necessary. It is to provide an agricultural film.

The agricultural air membrane film of the present invention is made of a film made of polyolefin resin or vinyl chloride resin, and is formed into a tube shape by stacking two sheets, and a plurality of air vent holes are distributed in the tube portion and a blower port Is provided.
The agricultural air membrane film of the present invention has a light transmittance of 80% or more, and has an antifogging treatment on one side, and a surface in which the antifogging function surface is overlapped in the forward direction. It was made to form.
The air vent hole of the agricultural air membrane film of the present invention is formed by alternately forming welded portions and non-welded portions having appropriate lengths at least on either side of the tube, or at least any surface of the tube. The small holes were uniformly distributed.
In addition, as the agricultural air membrane film of the present invention, a film in which any one of titanium oxide, carbon black, aluminum, and stainless steel is kneaded, vapor-deposited or sputtered is used.
Moreover, the agricultural air membrane film of this invention was made to couple | bond together by the film member of the predetermined width | variety which does not form an air membrane layer.
The air membrane film of the present invention has a structure in which cuts are provided on the surface, and synthetic resin magnets are attached to both sides along the cuts.
In the structure of the agricultural house of the present invention, the air film having the above-described configuration is used as a curtain in the house.
The lining curtain device of the present invention includes a sensor that detects the bulge width of the air film having the above-described configuration, and includes a unit that adjusts the blowing rate according to the detected bulge amount.

  The agricultural air membrane film of the present invention uses a film made of polyolefin resin or vinyl chloride resin as a raw material, and is formed into a tube shape by overlapping two sheets, so that an air membrane layer is formed. Since the heat release space is reduced in the form of an in-house house with less heat released, a highly efficient heat insulation property is secured, and a house with a structure that can save heating costs can be made. Then, a large number of air vent holes distributed on at least one surface of the overlapped film are provided, or at least one side of the tube has alternately welded portions and non-welded portions of an appropriate length. Since it is formed, it has an air venting function and can easily manage the temperature according to the conditions of the cultivated crop. In addition, air is easily discharged during winding, and can be stored in a compact manner, and does not hinder daylighting in the house.

In addition, the agricultural air membrane film of the present invention using a film having a transmissivity of 80% or more can be cultivated without losing the solar radiation in winter when photosynthesis of the cultivated crop is started at the same time when the rising sun rises. In addition, anti-fogging treatment is applied to one side, and the surface that exhibits the anti-fogging function is formed into a tube shape with a shape that overlaps in the forward direction. If it is stretched, the condensation forms water droplets and flows down along the film surface and does not hinder light transmission on the film surface. Furthermore, since the hole is provided, the accumulated water is discharged from the hole.
Since the agricultural air membrane film of the present invention is a structure in which only two films are structurally stacked, the packaging and distribution costs are minimal, and when necessary, air can be formed by blowing air from the supply port. High heat retention can be ensured, and when it is unnecessary, it can be easily exhausted from the air vent hole and can be stored small.

In addition, the agricultural air membrane film of the present invention using a film obtained by kneading, vapor deposition or sputtering of any of titanium oxide, carbon black, aluminum or stainless steel requires sunlight such as a snow room or tunnel cultivation. It is ideal for use where only a warming effect is required.
Further, the agricultural air membrane film of the present invention in which a plurality of members are joined by a single film member having a predetermined width that does not form an air film layer, the film member portion having a predetermined width that does not form the air film layer is housed. It can be attached to a structure, and it is easy to work as a curtain, and it can be firmly attached to the structure.
In addition, the air membrane film of the present invention having a structure in which cuts are provided in the surface and synthetic resin magnets are attached to both sides along the cuts, the cuts are closed by the magnetic force when the internal pressure of the air film is low. When the internal pressure becomes high at the time of winding, it opens and releases air, so that the winding load can be reduced.
The lining curtain device of the present invention is provided with a sensor for detecting a bulge width of an air film having a gas supply and an air vent hole, and a means for adjusting an air flow rate according to the detected bulge amount. Since the air supply amount can be adjusted in accordance with the condition, the optimum air film thickness can be maintained without being excessively swelled or the air film thickness being too thin.
In addition, since the air film curtain film of the present invention is used in a house without wind and uses a small blower, the load on the film is reduced, and a thin film with good translucency can be used. There is an advantage that a light and cheap air film can be used.

FIG. 1 shows the types of films for an air film-lined curtain according to the present invention. The film shown in A is made of a polyolefin-based resin or a vinyl chloride resin as a material, and is formed into a tube form 6 in a shape in which two sheets are stacked. One side 1 of the film has been subjected to an antifogging treatment, and the overlapped film is overlaid in a form in contact with the surface 1 which has not been subjected to the antifogging treatment. In this way, the layers stacked in the forward direction can be stretched so that the anti-fog treatment surface comes down when the curtain is stretched, and the condensation on the inner surface of the film and the inner surface of the house flows through the film surface as a thin water film. The film surface is not fogged. That is, the significance of overlapping the anti-fogging treatment surface in the forward direction is that the translucency of the coating film is not impaired and water droplets do not fall directly on the crop. The anti-fogging treatment surface may be either a coating of an anti-fogging agent on the film surface or a kneading of the film material used in a multilayer structure. The two films to be overlaid are welded and integrated at the sides to form a tube, but at least partly leave the non-welded part 2 so that this part forms an air vent. That is, in the illustrated example, the welded portion 3 and the non-welded portion 2 are alternately repeated at a predetermined interval, and the non-welded portion 2 becomes an air vent hole. Reference numeral 4 in the figure denotes an air supply port, which is a blower valve so that air does not flow backward. Since the film is blown from the air supply port 4 to inflate the film, the heat insulation of the air layer prevents heat from being radiated to the atmosphere, so high heat retention can be secured with a thin film.
In FIG. 1B, a single portion 5 of a film that does not take a tube form is extended to the side portion where the welded portions 3 and the non-welded portions 2 are alternately repeated at a predetermined interval. . The single portion 5 is used as an attachment portion when attaching the film of the present invention to a structure such as a house. When the single part 5 of the non-air film part provided on one side of the air film film side part is fixed to the house inner side surface position, the area for discharging the air and the area for fixing the film can be separated, so that the air film can be fixed to the fixed position. The load is not more than necessary.

In the form shown below, small air vent holes 7 are distributed and arranged at predetermined intervals on at least one surface of the tube portion 6, and what is shown in FIG. 2A is shown in FIG. Although shown, the air vent holes 7 are distributed and arranged at predetermined intervals on the surface where the anti-fogging surface is the outside. Incidentally, the present inventors performed 2.3 mmφ holes at intervals of 10 cm. When the film is stretched on the house, the antifogged surface becomes the inside of the house, so the air purged from the air vent hole 7 flows to the inside of the house. Therefore, if the air source is in the house, the air circulates inside the house curtain, and the heat retention efficiency is good. Since this form has an appropriate non-welded part 2 and an air vent hole 7, the blown air is appropriately removed to form an air film having an appropriate swelling. Incidentally, in the form shown in FIG. 1 in which air escapes only from the non-welded portion 2, the pressure in the film for forming an air film having an appropriate bulge was about 10 mm in the mercury column compared to the outside, but the non-welded In this example having the part 2 and the air vent hole 7, about 5 mm was appropriate. In general, the internal / external pressure difference in the air film is desirably 10 mm or less of mercury, and a large blowing capacity is not required, and a small blower of 30 watts or less is sufficient. Since a small blower is used, installation costs are low and running costs are low.
In addition, there are appropriate air vent holes on one side and upper and lower surfaces of the corner, so if the air flow is stopped, air can be vented in a few minutes depending on the size, and even if folded properly, the packaging becomes bulky. The space for storage and transportation can be minimized.

  FIG. 2B shows a configuration in which air film film tube portions are joined to both sides with a belt-shaped film member 5 having a predetermined width having a single structure in which no air film layer is formed. In this form of film material, the central strip-shaped film member 5 is fixed to the ridge member of the support frame pipe 10 of the lining curtain, and if it is spread on the pipe at a predetermined interval, the house shape in the house is formed as shown in the photograph in FIG. Is done. If the small blower 12 is placed inside the curtain and the air supply port is connected to the film air supply port 4 as shown in the photograph in FIG. 4, the air in the curtain is supplied from the small blower 12 into the air film film. Then, the tube portion 6 is appropriately inflated to form an air film and purged from the non-welded portion 2 and the air vent hole 7 to be ventilated inside the curtain.

  In addition, air film winding pipes are attached to the air film films on both sides of the side of the air film film facing the belt-shaped film member 5, and the air pipes are rotated by an air film winding mechanism to rotate the air film. The film film is stretched or wound up as a curtain. When you want to apply enough sunlight to the crops in the daytime, this film is rolled up, but when this film is stretched, it forms an air film, so if you wind up the winding pipe The volume of the tube 6 is reduced, the internal pressure is increased, and the winding load is increased. Although the internal air is not discharged from the non-welded portion 2 and the air vent hole 7, it cannot catch up with it alone, and the load is about three times that of the conventional case of winding a single film. Therefore, the present invention has a structure in which cuts 15 are provided on the air film surface, and plastic magnets 14 are attached to both sides along the cuts 15. The magnets 14 on both sides are cut by an attractive force when the internal pressure is low. When the internal pressure is high, it opens against the magnetic force so that a large amount of air can be discharged. That is, the slit-shaped cut end 15 that is normally closed is provided with a magnetic valve that operates so that the tube 6 expands and the cut end 15 opens when an abnormal pressure occurs, thereby providing an automatic overpressure release function. did. If the magnetism of the plastic magnet is too strong, it will not slip out due to the internal pressure of the air film during hoisting ventilation.

In the above description, the air film curtain film of the present invention has been described as being used in a greenhouse for crop cultivation where translucency is required. However, the present invention is not limited to this, and only heat insulation is required without requiring sunlight. It is also effective when applied to snow rooms, Udo and asparagus cultivation. In this case, since translucency is not required, it is preferable to form an air film using a film having a total reflectance of 50% or more and a light shielding ratio of 90% or more. When such a film is used to form an air film, the heat absorbed by the light-receiving surface side film is difficult to be transferred to the film on the inner surface, which is much higher heat insulation than that used in the form of a single film. It shows high effects on high temperature control in summer and warming in winter and night.
It should be noted that daily winding work is not necessary for this type of use.

Next, a method for automatically adjusting the air flow rate in order to form an air film having a desired thickness with the air film of the present invention will be described. When the air film curtain film according to the present invention is spread and placed on the support frame pipe 10 which is a structure and air is blown from the blower 12, the tube 6 is expanded and a part of the air is purged from the air vent hole while being uniform. Form. However, if the amount of blown air is greater than the amount of discharged air, the tube 6 swells, and if the amount of air discharged is larger than the amount of blown air, the tube 6 is deflated. Therefore, in the present invention, there is provided a method of arranging a sensor for detecting the distance between the two films of the tube 6 constituted by two films, that is, the swell width of the air film, and adjusting the blower 12 according to the amount. Adopted.
As a simple sensor, a pressure sensor is arranged on the air film restraining belt, and the blower 12 is turned on when the pressure exceeds a threshold value, and turned off when the pressure falls below a predetermined pressure, or a predetermined length between both films. Appropriate methods such as a method of arranging a micro switch at one end and driving the blower 12 on and off can be employed.

  An inner pipe 10 similar to the outer shape of the house is installed in a firewood pipe house with a frontage of 5.4m and a depth of 20m. Agricultural polyolefin film with a film thickness of 75μm and a far-infrared heat absorption rate of 70% is used as the material. 5 is a single 20 cm wide film layer, and a double-structured tube section 6 of the length of the side of the house that creates an air film is provided on both sides of the single film, and the overlapping position of the double air film is wide in the length direction. An air membrane film was provided which was welded at intervals of 2 cm in length and 50 cm apart to form a welded portion 3 and was continuously processed in such a manner that 10 cm between the welded portion 3 and the adjacent welded portion 3 became a non-welded portion 2. The air film was covered on the inner frame pipe 10 provided in the house in a manner that the single film layer 5 was positioned in the central building structure, and this film was fixed at the center. Winding pipes were attached to both ends of the coated film in the manner of a conventional film winding mechanism. Since the tube part 6 swells up when it is rolled up, it becomes difficult to wind up. Therefore, a 6 cm wide air film restraining belt is provided on the inner frame pipe 10 with a 1 m interval on which an air film film is placed. Arranged. In the form shown in FIG. 4, the air is blown by using a 50 W blower 12 inserted between the air film film that becomes the tube portion 6 with a PVC pipe at the air film covered top surface position, and the air blow amount is adjusted using a timer. did. When the weather was fine, we rolled up a wind-up pipe, wound up an air film, and ventilated so that sunlight could enter the house. During cloudy weather, the air film was kept covered.

  When the air film is rolled up, the air in the air film is squeezed by being sandwiched between the air film restraining belt having a width of 6 cm and the pipe 10 supporting the air film. At this time, the air in the tube portion 6 is discharged from the non-welded portion 2 having a width of 10 cm, but as the winding pipe approaches the central building structure, the internal pressure of the air film increases and the load on the winding is a normal single film. More than three times. As a countermeasure, a magnetic valve having an overpressure automatic release function is provided, but in this embodiment, the tube part 6 near the central single part 5 is provided with two magnetic valves. As shown in FIG. 5, the magnetic valve has a specific structure in which a slit 15 having a length of 20 cm is provided on one film of an air film, and a flexible synthetic resin magnet 14 is provided on both sides along the slit. And a synthetic resin magnet 14 was also arranged at a position facing the slit of the other film. Since the magnets 14 and 14 facing each other through the film are attached so that the attractive force acts on each other, when the internal pressure of the tube portion 5 is relatively low, the film is sandwiched by the magnetic force as shown in FIG. The slit-shaped cut 15 is closed, but when the internal pressure of the tube portion 5 is increased, the attracted state of the magnet 14 is released as shown in FIG. B, and the slit-shaped cut 15 is opened. With this overpressure automatic release function, a large amount of air in the air film was discharged, reducing the load caused by winding, and about 1.5 times the conventional single film winding. Furthermore, after rewinding after ventilation, it was confirmed that the magnets 14 and 14 returned to the original positions shown in FIG.

As a result of comparison between the house of this example from December 20 to 29, 2003, and a single curtain film-covered house of the same size, the minimum temperature of the air film film averaged 0.6 under the condition of using a heater. It was confirmed that the temperature was increased by ~ 0.7 ° C. See graph shown in FIG. In this experiment, two heaters were shared and the sensor was installed in the double curtain house and heated at a set temperature of 9 ° C. The average minimum temperature difference for 10 days is 0.5 ° C, but the difference is larger on the day when the temperature of the single curtain area is low. Therefore, it is predicted that the difference will further increase in the case of no heating.
Moreover, the effect confirmation in the house of this Example was as follows.
B) In cocoon cultivation, the heat retention at night increased, and the growth of cocoon progressed.
B) The night temperature has risen and the harvest of straw has been accelerated.
C, I was able to save heating costs.
Can be used for the exterior of a fully open house.
E. Can be used as an air film on the side of a house.

An embodiment in which the agricultural air membrane film of the present invention in which a plurality of air vent holes are distributed in the tube portion and provided with an air blowing port is used as a night heat retaining material for tunnel cultivation. Show. The picture shown on the left side of Fig. 7 is the same, but the size of the frontage is 2.7m, the depth is 10m, and the outer wall is 0.01mm thick agricultural PO film (registered trademark). A tunnel was made using an agricultural PO film (registered trademark) with a thickness of 0.075 mm in the structure of m. The photograph shown on the right side of FIG. 7 shows a single conventional tunnel built in the same house for comparison.
On March 6, the film was covered day and night, and the tunnel was released at 9:00 in the morning from March 13 to 15, and 16 hours from 16:00 in the evening to 9:00 in the next morning. The film was investigated as covered. The results were as shown in Table 1.

In the case of day and night coating, the maximum temperature rose to 51.2 degrees in the conventional type, but in the case of the air film of the present invention, the temperature was suppressed at 43 ° C., and a remarkable difference appeared. Regarding the minimum temperature, the conventional type was 0.6 degrees, while that of the present invention was as high as 2 ° C.
When only the lining tunnel was opened at 9 am and covered at 16:00 in the evening, the average temperature of 3/13 to 3/15 was 1.5 to 2 ° C. higher in the present invention than in the conventional type.
The outer film was a 0.1 mm thick agricultural PO film (registered trademark), and the test was performed in a sealed manner day and night. For this reason, it was found that the minimum temperature at night was high under unheated cultivation conditions, and in particular, a favorable temperature environment was provided for cultivation of low-temperature crops.
In addition, since night temperatures are high, heating costs can be expected when used for lining curtains.
Regarding the air film internal pressure in this example, since many air vent holes are distributed on the inner surface of the tube portion, the internal pressure in the air film in the unventilated state was slightly 2 mmHg higher than the outside air. The internal pressure increased to a maximum of 13 mmHg at the time of winding, but the conventional non-porous type has an internal pressure of 16 mmHg even in a non-ventilated state, and it is almost impossible to wind up. Since there are small holes in the present invention, it has been confirmed that the load applied to the hoisting opening and closing is small.

A is a figure which shows the basic form of the air film | membrane film of this invention, B is a figure which shows the form which connected the single part used as an attaching part to 1 side. A is a view showing a form in which a large number of air vent holes are distributed on the tube surface of a single part connected to one side, and B is a view showing a form in which air film films are arranged on both sides of a single part. It is a photograph which shows the example which stretched the air film | membrane film of this invention as a lining curtain in a house. It is a photograph which shows the example which ventilates from an air blower to the air supply port of a tube via a vinyl chloride pipe in an air membrane covering top surface position. It is a figure which shows one Example of the magnetic valve provided with the overpressure automatic cancellation | release function of this invention. It is a graph which shows the data in implementation of this invention. It is a photograph which shows the Example which used the air membrane film for agriculture of this invention as the night heat retention material of tunnel cultivation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-fog process surface 2 Non-welding part 3 Welding part 4 Air supply port 5 Single part 6 Tube 7 Air vent small hole 10 Lined curtain support frame pipe
12 Blower 14 Magnet
15 Cut for overpressure release

Claims (10)

  An agricultural air membrane film made of a film made of a polyolefin resin or a vinyl chloride resin and formed into a tube shape by overlapping two sheets, and a plurality of air vent holes are distributed in the tube portion and air blowing ports are provided.   2. The film material according to claim 1, wherein the film material has a light transmittance of 80% or more, is subjected to an antifogging treatment on one side, and is formed into a tube shape by superimposing a surface exhibiting an antifogging function in a forward direction. Agricultural air film film.   The agricultural air membrane film according to claim 1 or 2, wherein the air vent hole is formed by alternately forming a welded portion and a non-welded portion having an appropriate length on at least one side surface of the tube.   The agricultural air film according to any one of claims 1 to 3, wherein the air vent holes are small holes uniformly distributed on at least one surface of the tube.   The agricultural air membrane film according to claim 1, wherein a film obtained by kneading, vapor-depositing, sputtering or coating any of titanium oxide, carbon black, aluminum or stainless steel is used.   The agricultural air film according to any one of claims 1 to 5, wherein a plurality of films are joined together by a band-shaped film member having a predetermined width and having a single structure that does not form an air film layer.   A structure in which cuts are provided on the air film surface and synthetic resin magnets are attached to both sides along the cuts. When the internal pressures of the two sides are low, the cuts are closed by suction force and the internal pressure is high. The air film according to any one of claims 1 to 6, further comprising an overpressure automatic release function.   A structure of an agricultural house, wherein the air film according to claim 1 is used as an in-house curtain.   A structure of an agricultural house, wherein the air film according to claim 1 is used as a tunnel in a house.   The structure of the agricultural house of Claim 8 or 9 provided with the sensor which detects the bulge width | variety of an air film | membrane film, and the means to adjust ventilation volume according to the detected amount of bulges.