JP2007202426A - Greenhouse covering film and greenhouse - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide greenhouse covering film with which an excellently moisture-keeping greenhouse holding air in its inner part to surely form an air layer is formed; and to provide the greenhouse. <P>SOLUTION: The greenhouse covering film 1 is stretched between column supports 2, 2 of a greenhouse (A), formed into a cylindrical shape having no joints in its peripheral direction, and used through being flattened to be stretched between the column supports 2, 2 and supplied with air in its inner part, so that the greenhouse covering film 1 is provided with no joints in its peripheral direction and the air supplied in the greenhouse covering film 1 is surely held in the greenhouse covering film 1 to form an air layer so as to form excellently heat-retaining greenhouse (A). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an agricultural house covering film capable of forming an agricultural house excellent in heat retention and an agricultural house using the agricultural house covering film.

  Conventionally, agricultural houses are used for cultivating crops. This agricultural house is formed by disposing a plurality of pillars formed in a gate shape at predetermined intervals and stretching a synthetic resin covering film between the pillars. In order to improve the heat-retaining property inside, it has been practiced to stretch the two coated films in a state of being overlapped.

  However, it has been troublesome in terms of work to stretch between two supporting films in a state where two covering films are overlapped, and there is a problem that the efficiency of covering work for an agricultural house is poor.

  Thus, Patent Document 1 proposes a film for covering an agricultural house in which at least both longitudinal ends of the air film forming film having a double structure are hermetically sealed by heat welding or adhesion.

  However, the film for covering an agricultural house is manufactured by superposing two separate air film forming films and heat-welding or bonding the opposite ends in the width direction of the two air film forming films. Therefore, there are many cases where thermal welding or adhesion between films is insufficient, and when air is supplied into the film for covering an agricultural house, there is no heat welding or adhesion between the films. It may not be able to withstand the internal pressure, the joints between the air film forming films are partially separated, the air supplied into the film for agricultural house covering leaks to the outside, and the heat retention of the agricultural house decreases. It had the problem that it ended up.

  In addition, the film for covering an agricultural house uses an antifogging agent applied product or an antifogging agent kneaded product as the air film forming film, and the antifogging agent coating surface or the antifogging agent kneading surface is in the same direction. (Claim 4).

  Accordingly, the antifogging agent layer is interposed in the joint between the air film forming films, and the air film forming films are not sufficiently joined to each other, so that the above-described air leakage is more likely to occur.

JP 2004-141017 A

  INDUSTRIAL APPLICABILITY The present invention relates to an agricultural house covering film capable of forming an agricultural house that retains air inside and reliably forms an air layer to form an insulating house, and an agricultural house using the agricultural house covering film. Provide a house.

  The agricultural house covering film of the present invention is an agricultural house covering film that is used by being stretched between the columns of the agricultural house, and is formed into a seamless cylindrical shape in the circumferential direction, and is flattened. It is stretched between the columns of the agricultural house and is used with air supplied to the inside.

  And in the covering film of the said agricultural house, in the state stretched flat between the support | pillars of the agricultural house, while the antifogging layer is provided in the outer surface of the film part which faces in the agricultural house, agriculture An antifogging layer is not provided on the outer surface of the film portion facing the outside of the house.

  In the agricultural house covering film, the agricultural house covering film is formed by laminating and integrating a plurality of synthetic resin layers in the inner and outer directions, and the outermost synthetic resin layer does not contain an antifogging agent. At the same time, the innermost synthetic resin layer is characterized by containing an antifogging agent.

  And the agricultural house of the present invention is an agricultural house formed by stretching a covering film of an agricultural house between a plurality of gate-shaped columns arranged at predetermined intervals, The agricultural house covering film is formed into a seamless cylindrical shape in the circumferential direction, and is stretched between the columns in a flat shape in which both end openings are closed. It is characterized in that it can be supplied and filled with air.

  The agricultural house is provided with an anti-fogging layer on the outer surface of the film portion of the agricultural house coating film facing the agricultural house, while the agricultural house coating film facing the agricultural house exterior. An antifogging layer is not provided on the outer surface of the film part.

  Further, in the agricultural house, the covering film of the agricultural house is formed by laminating and integrating a plurality of synthetic resin layers in the inner and outer directions, and the outermost synthetic resin layer does not contain an antifogging agent. The inner synthetic resin layer contains an antifogging agent.

  The agricultural house covering film of the present invention is an agricultural house covering film that is used by being stretched between the columns of the agricultural house, and is formed into a seamless cylindrical shape in the circumferential direction, and is flattened. It is characterized in that it is stretched between the columns of the agricultural house and is supplied with air inside, so that there is no joint in the circumferential direction of the covering film of the agricultural house, An air layer can be formed by reliably holding the air supplied into the covering film of the household house, and an agricultural house having excellent heat retention can be formed.

  And the covering film of the agricultural house is formed in the seamless cylinder shape in the circumferential direction, and it is necessary to heat-weld or bond the opposing ends of two separate films as in the prior art. However, it can be continuously produced using a molding method such as inflation molding, and is excellent in production efficiency and uniform.

  Moreover, in the covering film for the agricultural house, an antifogging layer is provided on the outer surface of the film portion facing the agricultural house in a state where the film is stretched flat between the columns of the agricultural house. Since the outer surface of the film part facing the outside of the house is not provided with an anti-fogging layer, the coating film is formed by condensation due to moisture sprayed for plant cultivation in the agricultural house. Clouding can be surely prevented, and the plants in the agricultural house can be sufficiently irradiated with sunlight, so that the growth of the plants in the agricultural house can be made better.

  Furthermore, the cover film of the agricultural house is formed by laminating and integrating a plurality of synthetic resin layers in the inner and outer directions, the outermost synthetic resin layer does not contain an antifogging agent, and the innermost synthetic resin layer When an antifogging agent is contained, an antifogging layer can be formed by bleeding out the antifogging agent only on the inner peripheral surface of the agricultural house covering film, while the agricultural house covering film is formed. The antifogging layer can be prevented from being formed on the outer peripheral surface of the film portion, particularly on the outer surface of the film portion facing the outside of the agricultural house in the covering film of the agricultural house.

  Therefore, the surface of the coating film can be prevented from fogging due to dew condensation caused by the temperature difference between the inside and outside of the agricultural house, and the film portion facing the outside of the agricultural house in the coating film of the agricultural house can be used as an antifogging agent. It prevents the adhesion of dirt caused by it and ensures the transparency of the covering film of the agricultural house for a long period of time, supplying a sufficient amount of sunlight into the agricultural house to facilitate the cultivation of plants be able to.

  An example of the agricultural house covering film of the present invention will be described with reference to the drawings. Agricultural house covering film 1 is formed of a transparent synthetic resin film having flexibility, and is formed into a long and cylindrical shape as shown in FIG. 1, and is heat-sealed in the circumferential direction. There are no joints such as joints or adhesives.

  It does not specifically limit as a synthetic resin which comprises the coating film 1 of the said agricultural house, For example, a low density polyethylene, a medium density polyethylene, a high density polyethylene, an ethylene-alpha-olefin copolymer, ethylene-vinyl acetate Polyolefin resins such as polyethylene resins such as copolymers, propylene resins such as homopolypropylene, propylene-α-olefin copolymers, propylene-vinyl acetate copolymers; polyvinyl chloride resins; polyester resins; Examples include methyl methacrylate resins; polycarbonate resins, and the like. These may be used alone or in combination of two or more. Among these, as the synthetic resin, polyolefin resins are preferable, polyethylene resins are more preferable, and ethylene-α-olefin copolymers and ethylene-vinyl acetate copolymers are particularly preferable.

  Moreover, the covering film 1 of the agricultural house is a single-layer film as shown in FIG. 1, but as shown in FIG. 2, a plurality of (three layers in FIG. 2) synthetic resin layers 1a, 1b, 1c... May be laminated and integrated in layers in the inner and outer directions, but a plurality of synthetic resin layers 1a, 1b, 1c... Are laminated and integrated in layers in the inner and outer directions. Those are preferred.

  In particular, when the agricultural house covering film 1 is formed by laminating and integrating a plurality of synthetic resin layers 1a, 1b, 1c... In the inner and outer directions, an antifogging agent is formed on the outermost synthetic resin layer. In addition, it is preferable that the innermost synthetic resin layer 1a contains an antifogging agent. Of the plurality of synthetic resin layers 1a, 1b, 1c, ..., the remaining synthetic resin layer excluding the outermost synthetic resin layer and the innermost synthetic resin layer contains an antifogging agent. However, it is preferable that no antifogging agent is contained.

  By comprising in this way, while forming an antifogging layer by bleeding out the antifogging agent contained in the innermost synthetic resin layer 1a on the inner peripheral surface of the covering film 1 of an agricultural house, it is possible to The antifogging agent contained in the resin layer 1a prevents or delays the outermost synthetic resin layer from bleeding out to the outer peripheral surface of the coating film 1 during use of the coating film 1 of an agricultural house. The antifogging agent is prevented from bleeding out on the outer peripheral surface of the cover film 1 of the agricultural house.

  Therefore, as will be described later, in the state where the covering film 1 of the agricultural house is flattened between the pillars 2 of the agricultural house A,. It is possible to prevent dirt from adhering to the film portion 12 facing the surface due to the antifogging agent, and to ensure the transparency of the covering film 1 of the agricultural house for a long period of time.

  As the antifogging agent, conventionally known antifogging agents can be used, for example, polyhydric alcohol saturated fatty acid esters such as glycerin stearic acid ester, diglycerin stearic acid ester, polyglycerin stearic acid ester, sorbitol glyceryl stearic acid ester; Examples thereof include polyhydric alcohol unsaturated fatty acid esters such as acid esters and diglycerin oleates, and these may be used alone or in combination of two or more.

  The agricultural house covering film 1 is flattened and stretched between the pillars 2 and 2 of the agricultural house A, which will be described later. An antifogging layer 11b is integrally provided on the outer surface 11a of one film portion 11 of the pair of film portions 11 and 12, which is in a state, by applying an antifogging agent over the entire surface. The outer surface 12a of the other film portion 12 is not provided with an antifogging layer over the entire surface.

  As described above, the outer surface 11a of the film part 11 of the covering film for an agricultural house is integrally provided with the antifogging layer 11b by application of the antifogging agent. The antifogging layer 11b is formed in the film. Unlike the antifogging layer formed by bleed-out of the antifogging agent contained, it is substantially uniform and has a sufficient thickness and exhibits a very high antifogging effect.

  Therefore, although the humidity in the agricultural house A is high due to the influence of the water planted for the plants cultivated therein, the anti-fogging effect due to the application of the anti-fogging agent in the covering film of the agricultural house described above. The presence of the layer 11b effectively prevents the film portion 11 from being fogged due to dew condensation generated on the outer surface 11a of the film portion 11, so that a sufficient amount of sunlight can be supplied into the agricultural house A.

  As the antifogging agent constituting the antifogging layer 11b, a known one can be used, for example, an inorganic oxide sol typified by colloidal silica or colloidal alumina, or a liquid mainly composed of a surfactant. , Hydrophilic resins such as polyvinyl alcohol, polyethylene oxide, polysaccharides, and polyacrylic acid. Note that a surfactant and a synthetic resin may be added to the inorganic oxide sol mainly composed of colloidal silica or colloidal alumina, if necessary.

  Next, the manufacturing method of the coating film 1 for the agricultural house will be described. As a manufacturing method of the covering film 1 of an agricultural house, the method of using the following inflation molding is mentioned, for example. Specifically, first, the synthetic resin constituting the agricultural house covering film is supplied to an extruder, extruded from a circular die attached to the tip of the extruder into a cylindrical shape, and compressed from the center of the circular die. Air is supplied and stretched in the circumferential direction to produce a long cylindrical film. By making this cylindrical film into a flat state and applying an antifogging agent to the entire outer surface of one film part of a pair of film parts overlaid on each other in this flat cylindrical film, An agricultural house covering film can be manufactured.

  In addition, when the agricultural house covering film 1 is formed by laminating and integrating a plurality of synthetic resin layers, a plurality of extruders are prepared, and these extruders are connected to one circular die. A manufacturing apparatus is prepared. Then, different synthetic resins are supplied to each extruder.

  At this time, the antifogging agent is supplied to the extruder supplied with the synthetic resin constituting the innermost synthetic resin layer, but the extruder supplied with the synthetic resin constituting the outermost synthetic resin layer. No antifogging agent is supplied. An antifogging agent is supplied to the extruder supplied with the synthetic resin constituting the remaining synthetic resin layer excluding the innermost synthetic resin layer and the outermost synthetic resin layer among the plurality of synthetic resin layers. However, it is preferable that no antifogging agent is supplied.

  The synthetic resin supplied to each extruder is melt-kneaded in the extruder and then supplied to the circular die attached to the tip of the extruder, and the synthetic resin in the molten state is laminated in layers in the circular die Then, it is extruded from a circular die into a cylindrical shape, and compressed air is supplied from the center of the circular die and stretched in the circumferential direction to produce a long cylindrical film. And it makes agriculture by making this cylindrical film into a flat state, and applying an anti-fogging agent to the whole outer surface of one film part of a pair of film parts mutually overlapped in this cylindrical film in the flat state A house covering film can be manufactured.

  Examples of the method for applying the antifogging agent to the outer surface of the film portion include a roll coating method such as a gravure coater, a barcode method, a dip coating method, a spray method, and a brush coating method.

  Next, the point which forms the agricultural house A using the coating film 1 of the said agricultural house is demonstrated. First, a plurality of gate-shaped supports 2, 2... That are the framework of the agricultural house A are arranged on the ground at predetermined intervals. Note that the upper ends of the plurality of gate-shaped support columns 2, 2,... Are connected to each other by a long connecting member (not shown).

  And as shown in FIG.3 and FIG.4, let the covering film 1,1 ... of a plurality of elongate agricultural houses be a flat state over the full length of the length direction, and these flatness .. Agricultural house covering films 1, 1... Are stretched between the columns 2, 2,... In addition, using the connectors 3, 3... Integrally provided on the support columns 2, 2,... After overlapping the opposing ends of the covering films 1, 1 of the agricultural houses adjacent to each other. Connect and integrate. At this time, adjustment is made so that the anti-fogging layer 11b of the covering film 1 of the agricultural house is in the agricultural house A.

  Furthermore, both ends of the covering film 1 of each agricultural house are completely closed so that the inside of the covering film 1 of each agricultural house serves as an air-filled portion 14, and a plurality of agricultural house covering films 1; The two dome-shaped opening ends formed in 1 ... are covered with a publicly known agricultural film 4 separately prepared, and the gate-shaped columns 2, 2 ... are covered with a plurality of agricultural house covering films. 1, 1... And agricultural films 4, 4. In addition, it does not specifically limit as a method of obstruct | occluding the both-ends opening part of the covering film 1 of an agricultural house, You may obstruct | occlude with the obturator prepared separately other than the method by heat sealing | fusion or adhesion | attachment.

  Further, as shown in FIG. 5, the connector 3 includes a long groove member 31 having a groove portion 31 a having a U-shaped cross section, and a wave shape that is removably fitted into the groove portion 31 a of the groove member 31. And a fastener 32 formed in the above.

  The groove member 31 is in a state of straddling the struts 2, 2, while the length direction thereof matches the disposing direction of the struts 2, 2. The groove member 31 is integrated with each other and inserted into the groove portion 31a of the groove member 31 with the opposing end portions of the covering films 1 and 1 of the agricultural house adjacent to each other being overlapped with each other. By fitting the stopper 32 detachably in the groove 31a, the covering films 1 and 1 of the agricultural house adjacent to each other are connected and integrated without any gap.

  Furthermore, a cylindrical air intake 13 is integrally provided in one film portion 11 of the covering film 1 of each agricultural house arranged as described above so as to penetrate the film portion 11 in the inner and outer directions. The air intakes 13, 13... Are connected and communicated with each other by a single connecting pipe 5, and the pump P connected to the end of the connecting pipe 5 is operated to thereby connect the connecting pipe 5 and the air intake opening. It is comprised so that air can be supplied into the air filling part 14 of the coating film 1 of each agricultural house through 13.

  And as shown in FIG. 6, the air film B is formed in the coating film 1 of each agricultural house that is supplied and filled with air into the air-filled portion 14, and this air layer B is a heat insulating layer. Agricultural house A has excellent heat retention. The agricultural house covering film 1 has no joints or adhesive joints formed in the circumferential direction thereof. Therefore, the agricultural house covering film 1 is covered with the air pressure supplied into the agricultural house covering film 1. The film is not damaged, and air can be reliably formed in the covering film 1 of the agricultural house to reliably form the air layer B, so that the inside of the agricultural house A can be kept warm.

  Furthermore, the inside of the agricultural house A is in a highly humid state because it is sprinkled for plant cultivation, but the film portion 11 of the covering film 1 of the agricultural house is covered with the covering film 1 of the agricultural house. The presence of the air layer B formed inside does not directly contact the outside air outside the agricultural house A, and an antifogging agent is applied to the outer surface 11a of the film portion 11 of the covering film 1 of the agricultural house. The antifogging layer 11b is provided on the entire surface, and therefore, condensation is unlikely to occur on the antifogging layer 11b of the film portion 11 of the agricultural house covering film 1, and the film portion of the agricultural house covering film 1 is formed. When dew condensation occurs on the 11 anti-fogging layer 11b, this dew smoothly flows downward, and the film portion 11 of the covering film 1 of the agricultural house does not become cloudy. A. Agricultural house cover It is possible to supply a sufficient amount of sunlight it through film 1.

  Also, due to the moisture contained in the air layer B formed in the agricultural house covering film 1, on the inner peripheral surface of the agricultural house covering film 1 due to the temperature difference between the inside and outside of the agricultural house A. Condensation may occur, but even in such a case, the antifogging agent contained in the synthetic resin layer is bleeded out on the entire inner peripheral surface of the cover film 1 of the agricultural house. An anti-fogging layer is formed, and the dew condensation smoothly flows downward by this anti-fogging layer, so that the inner peripheral surface of the coating film 1 of the agricultural house is not clouded, and the agricultural house A has an inside. A sufficient amount of sunlight can be supplied through the covering film 1 of the agricultural house.

  As described above, the agricultural house A obtained by using the agricultural house covering film 1 of the present invention has excellent heat retention due to the air layer formed in the agricultural house covering film 1. At the same time, it is possible to substantially prevent fogging and dirt from adhering to the agricultural house covering film 1, and to sufficiently supply sunlight to the plants in the agricultural house A through the agricultural house covering film 1. Plants can be stably cultivated in house A.

It is the end view which showed the coating film of the agricultural house of this invention. It is the end elevation which showed other examples of the covering film of the agricultural house of this invention. It is the perspective view which showed the agricultural house formed using the coating film of the agricultural house of this invention. It is sectional drawing which showed the agricultural house formed using the coating film of the agricultural house of this invention. It is sectional drawing which showed the junction part of the covering films of the agricultural house. It is sectional drawing which showed the junction part of the covering films of the agricultural house.

Explanation of symbols

1 Agricultural house coating film
1a, 1b, 1c Synthetic resin layer
11, 12 Film part
11b Anti-fog layer 2 Prop A Agricultural house B Air layer

Claims (6)

A covering film for an agricultural house that is stretched between pillars of an agricultural house, formed in a seamless cylindrical shape in the circumferential direction, and flattened between the pillars of the agricultural house. A cover film for an agricultural house, wherein air is supplied to the inside of the agricultural house. On the outer surface of the film part facing the outside of the agricultural house, the antifogging layer is provided on the outer surface of the film part facing the inside of the agricultural house in a state of being flattened between the columns of the agricultural house. The coating film for an agricultural house according to claim 1, wherein no antifogging layer is provided. Agricultural house covering film is made by laminating and integrating a plurality of synthetic resin layers in the inner and outer directions. The outermost synthetic resin layer does not contain an anti-fogging agent, and the innermost synthetic resin layer has an anti-fogging property. The fogging agent is contained, The covering film of the agricultural house of Claim 1 or Claim 2 characterized by the above-mentioned. An agricultural house formed by stretching an agricultural house covering film between a plurality of gate-shaped columns arranged at predetermined intervals, and the agricultural house covering film It is formed in a cylindrical shape with no joints in the direction, and is stretched between the support columns in a flat shape with closed openings at both ends, so that air can be supplied and filled in the covering film of the agricultural house. Agricultural house characterized by An antifogging layer is provided on the outer surface of the film portion of the agricultural house covering film facing the agricultural house, while the outer surface of the film portion of the agricultural house covering film facing the outer portion of the agricultural house is protected. The agricultural house according to claim 4, wherein a cloudy layer is not provided. Agricultural house covering film is made by laminating and integrating a plurality of synthetic resin layers in the inner and outer directions. The outermost synthetic resin layer does not contain an anti-fogging agent, and the innermost synthetic resin layer has an anti-fogging property. The agricultural house according to claim 4 or 5, wherein a clouding agent is contained.

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