Folded agricultural film and method for manufacturing the same

Abstract

To provide agricultural film foldable body that can be folded compactly while being easy to deploy and has good drip-proof properties, and to provide methods for manufacturing an agricultural film foldable body.SOLUTION: Provided is a strip-shaped agricultural film foldable body 11 formed by folding an agricultural film 13 a plurality of times in the width direction, the agricultural film 13 having a drip-proof coating film 29 on at least one side, both edges 43 in the width direction of the agricultural film 13 abutting or approaching approximately at the center in the width direction of the agricultural film foldable body 11, and both edges 43 being not located in the outermost layer of the agricultural film foldable body 11.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a wide, long-term stretched agricultural polyolefin resin film having excellent resistance to crease tearing and used in greenhouse cultivation or tunnel cultivation, a folded agricultural film in a so-called agricultural film, and a method for manufacturing the folded agricultural film. [Background technology]

[0002] Agricultural films, such as agricultural polyolefin films molded by the inflation method, can be produced in widths of 10 m or more, do not require width joining, and do not have problems such as insufficient fusion at the joints, so they are preferably used (see, for example, Patent Document 1). Generally, agricultural films are added with a large amount of anti-fog agents to impart anti-fog properties, or coated with anti-fog coating agents. However, agricultural films have a smooth surface to impart transparency, so the films tend to adhere to each other, and this tendency is particularly pronounced for films formed in the summer. Therefore, an agricultural film that can eliminate adhesion between films has been proposed (see Patent Document 2).

[0003] In the examples, this agricultural film is manufactured into a cylindrical shape by a known inflation method by blending an anti-fogging agent consisting of a sorbitan-based or glycerin-based surfactant, and then gusset-folded. The gusset fold is formed such that an opening is provided near the center of the fold width along the longitudinal direction of the film, for example, like a double door. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-355460 A [Patent Document 2] Japanese Patent Application Publication No. 11-127700 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the agricultural film disclosed in Patent Document 2 is provided with an anti-fog coating and folded in a gusset as shown in FIG. 1 of the amendment, there are some places where the anti-fog coating is folded inward to form a valley fold, and there is a problem that the anti-fog coating is prone to cracking at this fold. In addition, after the cracking, peeling occurs, resulting in poor anti-fog properties. In particular, when the film is spread out over a greenhouse, if there are cracks at the valley folds on the roof of the greenhouse, the drip-proofing properties are deteriorated. In addition, the agricultural film is difficult to spread out because of its wide product width, which means that it is difficult to handle.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a folded agricultural film that can be folded compactly while being easily unfolded, and that has good anti-fogging and drip-proof properties, and a method for manufacturing a folded agricultural film. [Means for solving the problem]

[0007] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The agricultural film folding body 11 according to claim 1 of the present invention is a belt-shaped agricultural film folding body 11 formed by folding an agricultural film 13 multiple times in the width direction, The agricultural film 13 has a drip-proof coating film 29 on one surface which is the outer surface when folded and faces the inside of the greenhouse 53 when unfolded. The width of the agricultural film 13 is set to cover the roof 57 and both sides 55 of the greenhouse 53, Both ends of the agricultural film 13 in the width direction are Located along the ridge of the house 53 The agricultural film 13 is in contact with or close to the agricultural film folded body 11 at a position that is approximately the center in the width direction when the agricultural film 13 is unfolded, and both end edges 43 are located in the outermost layer of the agricultural film folded body 11. Folded without The portion (valley fold 51) of the one surface having the drip-proof coating film 29 is located on the side surface 55 of the house 53 in the expanded state of the house, and is located within 1 / 5 of the width from one edge 43 of the agricultural film 11 in the width direction. It is characterized by:

[0008] In this agricultural folded film 11, one of the surfaces that becomes the outer surface is the drip-proof coating film 29. Therefore, the agricultural folded film 11 can be unfolded from the outside of the greenhouse 53 with the drip-proof coating film 29 facing inward, for example, by unfolding it in sequence starting from the outer mountain fold 45. In other words, the agricultural folded film 11 can be easily unfolded from a compactly folded state, unfolding on both sides like a gusset fold. The folded agricultural film 11 is unfolded in the width direction of the frontage of the house 53, with its approximate center in the width direction aligned with the ridge of the house 53. At this time, the folded agricultural film 11 has both end edges 43 disposed in the approximate center in the width direction, and both end portions 21 in the width direction become mountain folds 45. When the mountain folds 45 are unfolded, the drip-proof coating film 29 formed on one of the outer surfaces is compressed, making them less likely to crack. On the other hand, the valley folds 51 have the drip-proof coating film 29 formed on one of the surfaces in the pulling direction, making them more likely to crack. Therefore, in the agricultural folded film 11, both end edges 43 sandwiching the slit 41 can be arranged along the ridge, so that the mountain folds 45 can be easily arranged on the roof 57. In other words, the valley folds 51 can be arranged on the greenhouse side surfaces 55. This makes it possible to suppress the occurrence of cracks in the roof 57, which deteriorates drip resistance. As a result, the film can be folded compactly while being easily unfolded, and has good drip resistance.

[0009] In this folded agricultural film 11, the portion where one surface having the drip-proof coating 29 is valley-folded is located within 1 / 5 of the width from either one of the edges 43 in the width direction of the agricultural film 13. That is, the valley fold 51 is located away from both ends 43 located approximately in the center in the width direction in the folded state. Since both ends 43, which are approximately in the center in the width direction of the folded agricultural film 11, can be located on the ridge of a house 53, for example, the valley fold 51 located away from both ends 43 is less likely to be located on the roof 57 and more likely to be located on the side surface 55 of the house. This makes it possible to suppress the occurrence of cracks in the roof 57 that deteriorate drip-proofness.

[0010] In addition, the agricultural folded film 11 wound into a roll is placed so that the approximate center in the direction along the winding central axis, i.e., the approximate center in the width direction of the strip 19, coincides with the ridge of the greenhouse 53. Thereafter, the roll can be rolled along a ridge pipe on the roof, while spreading out the unstretched agricultural folded film 11 in the longitudinal direction (depth direction) of the ridge.

[0011] The method for manufacturing the folded agricultural film 59 according to claim 2 of the present invention is a method for manufacturing a folded agricultural film of an agricultural film whose width when unfolded is a width that covers the roof 57 and both side surfaces 55 of a greenhouse 53, a flattening step of flattening the long cylindrical film into a two-layered strip 19 of a certain width; a drip-proof film forming step of forming a drip-proof film on the outer peripheral surface of the two-layered band 19; a cutting step of cutting one layer of the two-layered strip 19 along a longitudinal direction; a folding step of folding the band 19 at least once along the longitudinal direction so that both end edges 43 formed in the cutting step are not positioned in the outermost layer after folding and so that both end edges 43 are in contact or close to each other; Including, In the cutting step, the strip 19 is cut in the longitudinal direction at a position corresponding to 1 / 4 of the width of one of the two mountain folds 45 that form the widthwise ends 21 of the strip 19 to form the both end edges 43; In the folding process, the valley fold position (valley fold portion 51) is set to a position 1 / 8 from the edge 43 in the film width length that will be the position of the house side surface 55 when the house is expanded, When placed in the house 53 The house 53 is characterized in that both end edges 43, which are to be the ridges of the house 53, are positioned inward, and the mountain folds 45 are aligned and folded four times so as to overlap each other.

[0012] In the manufacturing method of this folded agricultural film 59, first, the agricultural film 13 formed into a cylindrical shape by the inflation method is flattened to obtain a two-layered strip 19 of a certain width. The outer peripheral surface of this strip 19 becomes the drip-proof coating film 29. One layer of the strip 19 is cut along the longitudinal direction to form a slit 41. Both sides of the slit 41 become both end edges 43 of the strip 19. The strip 19 is folded at least once along the longitudinal direction so that both end edges 43 are in contact or close to each other (the slit 41 does not open) and so that both end edges 43 do not become the outermost layers when folded. The outer peripheral surface of the folded agricultural film 59 in the state of the strip 19 thus folded is the drip-proof coating film 29. Therefore, for example, by unfolding it in order from the outer mountain fold 45, the folded agricultural film 59 can be unfolded from the outside of the greenhouse 53 with the drip-proof coating film 29 facing inward. In other words, the folded agricultural film 59 can be easily unfolded by unfolding it on both sides from the compactly folded state.

[0013] Moreover, the agricultural folded film 59 has both end edges 43 disposed approximately in the center in the width direction, and both end portions 21 in the width direction are mountain folds 45. The agricultural folded film 59 has both end edges 43 sandwiching the slit 41 disposed along the ridge, which makes it easy to place the mountain folds 45 on the roof 57. In other words, the valley folds 51 can be placed on the side surfaces 55 of the greenhouse.

[0014] In the manufacturing method of this folded agricultural film 59, the two-layered strip 19 is further folded to form four layers so that both mountain folds 45 are aligned, thereby making the width after folding compact at 1 / 4 of the width of one sheet of agricultural film 13. In addition, in this folded agricultural film 59, the valley fold 51 can be positioned at 1 / 8 from the edge 43 when the total width of the film is taken as 1. In other words, the valley fold 51 can be easily positioned on the greenhouse side surface 55. In addition, in this folded agricultural film 59, the strip 19 can be folded only once, and the valley fold 51 can be located in only one place.

[0015] The method for producing the agricultural film 61 according to claim 3 of the present invention is as follows: The agricultural film has a width when stretched that covers the roof 57 and both sides 55 of the greenhouse 53. A method for manufacturing an agricultural film folding body 61, a flattening step of flattening the long cylindrical film into a two-layered strip 19 of a certain width; a drip-proof film forming step of forming a drip-proof film on the outer peripheral surface of the two-layered band 19; a cutting step of cutting one layer of the two-layered strip 19 along a longitudinal direction; a folding step of folding the band 19 at least once along the longitudinal direction so that both end edges 43 formed in the cutting step are not positioned in the outermost layer after folding and so that both end edges 43 are in contact or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43; In the folding process, the two mountain folds 45 that are to be both ends 21 in the width direction of the band 19 are each valley-folded at a position 1 / 3 from both ends 21 in the width direction in a direction covering both end edges 43, and one mountain fold 45 is folded six times so as to be inside the other mountain fold 45. The position of the valley fold (valley fold 51) is the edge of the film. 43 1 / 12 of the width of the house, and becomes the position of the house side surface 55 when the house is expanded. It is characterized by:

[0016] In the manufacturing method of this folded agricultural film 61, the two-layered strip 19 is further folded into six layers, so that the width after folding is completed can be made compact at 1 / 6 the width of one sheet of agricultural film 13. Also, in this folded agricultural film 61, the position of the valley fold 51 can be made 1 / 12 of the total width of the film. In other words, it becomes easier to arrange the valley fold 51 on the greenhouse side surface 55.

[0017] The method for producing the agricultural film 63 according to claim 4 of the present invention is as follows: The agricultural film has a width when stretched that covers the roof 57 and both sides 55 of the greenhouse 53. A method for manufacturing an agricultural film folding body 63, comprising the steps of: a flattening step of flattening the long cylindrical film into a two-layered strip 19 of a certain width; a drip-proof film forming step of forming a drip-proof film on the outer peripheral surface of the two-layered band 19; a cutting step of cutting one layer of the two-layered strip 19 along a longitudinal direction; a folding step of folding the band 19 at least once along the longitudinal direction so that both end edges 43 formed in the cutting step are not positioned in the outermost layer after folding and so that both end edges 43 are in contact or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43; In the folding process, the two mountain folds 45, which are both ends 21 in the width direction of the band 19, are folded toward the both edges 43 at a position 1 / 6 from both ends 21 in the width direction, and are further folded at a position 2 / 6 from both ends 21, so that the mountain folds 45 at the 1 / 6 position face each other and overlap both ends 43, thereby folding the band 19 six times. The valley folds (valley folds 51) are located at 1 / 12 and 2 / 12 of the film width from the edge 43, and are positioned at the side surface 55 of the house when the house is expanded. It is characterized by:

[0018] In the manufacturing method of this folded agricultural film 63, the two-layered strip 19 is further folded into six layers, so that the width after folding is completed can be made compact at 1 / 6 the width of one sheet of agricultural film 13. Also, in this folded agricultural film 63, the position of the valley fold 51 can be made 1 / 6 of the total width of the film. In other words, the valley fold 51 can be more easily arranged on the side surface 55 of the house.

[0019] The method for producing the agricultural film 65 according to claim 5 of the present invention is as follows: The agricultural film has a width when stretched that covers the roof 57 and both sides 55 of the greenhouse 53. A method for manufacturing an agricultural film folding body 65, comprising the steps of: a flattening step of flattening the long cylindrical film into a two-layered strip 19 of a certain width; a drip-proof film forming step of forming a drip-proof film on the outer peripheral surface of the two-layered band 19; a cutting step of cutting one layer of the two-layered strip 19 along a longitudinal direction; a folding step of folding the band 19 at least once along the longitudinal direction so that both end edges 43 formed in the cutting step are not positioned in the outermost layer after folding and so that both end edges 43 are in contact or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43; In the folding process, the two mountain folds 45, which are both ends 21 of the band 19 in the width direction, are folded toward the both edges 43 at 1 / 8 positions from both ends 21 in the width direction, and then folded at 2 / 8 positions from both ends 21, and further folded at 3 / 8 positions from both ends 21, so that the mountain folds 45 at the 2 / 8 positions face each other and are folded so as to overlap the both edges 43, thereby folding the band 19 in eight folds. The valley folds (valley folds 51) are located at 1 / 16, 2 / 16, and 3 / 16 of the film width from the edge 43, and are positioned at the side surface 55 of the house when the house is expanded. It is characterized by:

[0020] In the manufacturing method of this folded agricultural film 65, the two-layered strip 19 is further folded into eight layers, so that the width after folding is completed can be made compact at 1 / 8 the width of one sheet of agricultural film 13. Also, in this folded agricultural film 65, the position of the valley fold 51 can be made 3 / 16 of the total width of the film, which is taken as 1. In other words, the valley fold 51 can be more easily positioned on the greenhouse side surface 55.

[0021] The method for producing the agricultural film 11 of the present invention is as follows: a flattening step of flattening the long cylindrical film into a two-layered strip 19 of a certain width; a drip-proof film forming step of forming a drip-proof film on the outer peripheral surface of the two-layered band 19; a cutting step of cutting one layer of the two-layered strip 19 along a longitudinal direction; a folding step of folding the band 19 at least once along the longitudinal direction so that both end edges 43 formed in the cutting step are not positioned in the outermost layer after folding and so that both end edges 43 are in contact or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43; In the folding process, when folding the band 19 n times from each of the mountain folds 45 which become both ends 21 in the width direction, the band 19 may be folded in ((n+1)×2) times by repeating valley folds n times toward both end edges 43, with a length from both end edges 21 being 1 / (n+1) multiplied by 1 / 2, and folding the band 19 toward both end edges 43 while rolling each of the mountain folds 45 inward.

[0022] In the manufacturing method for this agricultural folded film 11, when the strip 19 is folded n times from each of the mountain folds 45 that become both ends 21 in the width direction, the length from both ends 21 is set to a position obtained by multiplying 1 / (n+1) by 1 / 2. On the side of both end edges 43, valley folds are repeated n times, and while rolling up both mountain folds 45, the strip is folded toward both end edges 43, resulting in ((n+1)×2) folds. This agricultural film folding body 11 can be made compact by making it into ((n+1) x 2) layers, so that the width after folding is 1 / (n+1) times the width of one sheet of agricultural film 13 multiplied by 1 / 2.

[0023] In addition, the method for manufacturing the agricultural film folding body 67 of the present invention is as follows: a flattening step of flattening the long cylindrical film into a two-layered strip 19 of a certain width; a drip-proof film forming step of forming a drip-proof film on the outer peripheral surface of the two-layered band 19; a cutting step of cutting one layer of the two-layered strip 19 along a longitudinal direction; a folding step of folding the band 19 at least once along the longitudinal direction so that both end edges 43 formed in the cutting step are not positioned in the outermost layer after folding and so that both end edges 43 are in contact or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43; In the folding step, the two mountain folds 45 which form both ends 21 in the width direction of the band 19 may be folded inwardly and valley-folded to form folds 69, and further folded in a valley fold at an intermediate position between the folds 69 and the two mountain folds 45, so that the folds 69 and the mountain folds 45 overlap each other, to form eight folds.

[0024] In the manufacturing method of this folded agricultural film 67, the two-layered strip 19 is further folded into eight layers, so that the width after folding is completed can be made compact at 1 / 8 the width of one sheet of agricultural film 13. Also, in this folded agricultural film 67, the valley fold 51 can be positioned at 5 / 16 from the edge 43 when the total width of the film is taken as 1. In other words, it can be made difficult for the valley fold 51 to be positioned on the roof 57. Effect of the Invention

[0025] According to the folded agricultural film of claim 1 of the present invention, it can be folded compactly while being easily unfolded, and furthermore, it has good drip-proof properties. In addition, with this folded agricultural film, the valley folds, which are at risk of developing cracks that affect the film's drip-proofing, are located on the side of the greenhouse, so that the film can maintain good drip-proofing properties. That is, in this folded agricultural film, the portion where one surface having the drip-proof coating is valley-folded is located within 1 / 5 of the width from either edge in the width direction of the agricultural film. That is, the valley fold is located away from both end edges located approximately in the center in the width direction in the folded state. Since both end edges that are approximately in the center in the width direction of the folded agricultural film can be located on the ridge of a greenhouse, for example, the valley folds that are away from both end edges are less likely to be located on the roof and more likely to be located on the side of the greenhouse. This makes it possible to suppress the occurrence of cracks in the roof that deteriorate the drip-proof property.

[0026] According to the method for producing a folded agricultural film of the present invention, the agricultural film can be folded compactly at a length equal to 1 / 4 of its width, with both cut edges sandwiched between the film and the left and right sides asymmetrical. In this method for manufacturing a folded agricultural film, the two-layer strip is further folded to make four layers so that both mountain folds are aligned, making the width after folding compact by 1 / 4 of the width of one sheet of agricultural film. In addition, in this folded agricultural film, the valley fold can be located 1 / 8 from the edge when the total width of the film is 1. In other words, the valley fold can be easily positioned on the side of the greenhouse. In addition, in this folded agricultural film, the strip can be folded only once, and the valley fold can be located in only one place.

[0027] According to the manufacturing method of the folded agricultural film of claim 3 of the present invention, the agricultural film can be folded even more compactly by folding the left and right sides together at a length of 1 / 6 of the width, sandwiching both cut edges. In this method for manufacturing a folded agricultural film, the two-layer strip is further folded into six layers, making the width after folding compact at 1 / 6 the width of one sheet of agricultural film. Also, in this folded agricultural film, the position of the valley fold can be made 1 / 12 of the total width of the film. In other words, it becomes easier to arrange the valley fold on the side of the greenhouse.

[0028] According to the manufacturing method of the folded agricultural film of the present invention described in claim 4, the agricultural film can be folded symmetrically at 1 / 6 of its width by pinching both cut edges and wrapping the left and right sides twice, making it more compact and easier to unfold. In this method for manufacturing a folded agricultural film, the two-layer strip is further folded into six layers, making the width after folding compact at 1 / 6 the width of one sheet of agricultural film. Also, in this folded agricultural film, the position of the valley fold can be made 1 / 6 of the total width of the film. In other words, the valley fold can be more easily positioned on the side of the greenhouse.

[0029] According to the manufacturing method of the folded agricultural film of the present invention described in claim 5, the agricultural film can be folded symmetrically at 1 / 8 of its width by wrapping the cut edges around the left and right three times, making it more compact and easier to unfold. In this method for manufacturing a folded agricultural film, the two-layer strip is further folded into eight layers, making the width after folding compact at 1 / 8 the width of one sheet of agricultural film. Also, in this folded agricultural film, the position of the valley fold can be set to 3 / 16 of the total width of the film. In other words, the valley fold can be more easily positioned on the side of the greenhouse. [Brief description of the drawings]

[0030] [Figure 1] 1 is a conceptual diagram of a manufacturing apparatus for carrying out a manufacturing method according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a process diagram showing a folding procedure of the agricultural folded film according to the first embodiment. [Diagram 3] FIG. 2 is an enlarged perspective view of a main part of the folded agricultural film according to the first embodiment. [Figure 4] FIG. 2 is a perspective view of a roll of the folded agricultural film according to the first embodiment. [Diagram 5] FIG. 2 is an explanatory diagram showing the relationship between the positions of mountain folds and valley folds of the folded agricultural film according to the first embodiment and the position of a greenhouse. [Figure 6] FIG. 2 is an explanatory diagram showing a method for unfolding the folded agricultural film according to the first embodiment. [Figure 7] FIG. 11 is a process diagram showing a folding procedure of the agricultural folded film according to the second embodiment. [Figure 8] FIG. 11 is an explanatory diagram showing the relationship between the positions of mountain folds and valley folds of the folded agricultural film according to the second embodiment and the position of a greenhouse. [Figure 9] 11 is an explanatory diagram showing a method for unfolding the folded agricultural film according to the second embodiment. FIG. [Figure 10]13 is a process diagram showing a folding procedure of the agricultural folded film according to the third embodiment. FIG. [Figure 11] FIG. 11 is an explanatory diagram showing the relationship between the positions of mountain folds and valley folds of the folded agricultural film according to the third embodiment and the position of a greenhouse. [Figure 12] FIG. 11 is a front view of the folded agricultural film according to the third embodiment, as viewed along the slits. [Figure 13] FIG. 13 is a process diagram showing a folding procedure of the agricultural folded film according to the fourth embodiment. [Figure 14] FIG. 13 is an explanatory diagram showing the relationship between the positions of mountain folds and valley folds of the folded agricultural film according to the fourth embodiment and the position of a greenhouse. [Figure 15] FIG. 13 is a front view of the folded agricultural film according to the fourth embodiment, as viewed along the slits. [Figure 16] FIG. 13 is a process diagram showing a folding procedure of the agricultural folded film according to the fifth embodiment. [Figure 17] FIG. 13 is an explanatory diagram showing the relationship between the positions of mountain folds and valley folds of the folded agricultural film according to the fifth embodiment and the position of the greenhouse. [Figure 18] FIG. 13 is a front view of the folded agricultural film according to the fifth embodiment, as viewed along the slits. [Figure 19] FIG. 13 is a process diagram showing a folding procedure of the agricultural folded film according to the sixth embodiment. [Figure 20] FIG. 13 is an explanatory diagram showing the relationship between the positions of mountain folds and valley folds of a folded agricultural film according to a sixth embodiment and the position of a greenhouse. [Figure 21] FIG. 13 is a front view of the folded agricultural film according to the sixth embodiment, as viewed along the slits. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0032] [First embodiment] FIG. 1 is a conceptual diagram of a manufacturing apparatus for carrying out a manufacturing method according to a first embodiment of the present invention. The manufacturing method of the folded agricultural film 11 according to this embodiment is roughly divided into a flattening step, a drip-proof (or anti-fogging) film forming step, a cutting step, and a folding step. The agricultural folded film 11 produced by this manufacturing method is produced by the inflation method, which is a known film manufacturing method, and is a single-layer type or a laminated type that has improved transparency, dust resistance, flexibility, strength, etc.

[0033] [Flattening process] The thickness of the agricultural folded film 11 is selected depending on the place where it is used, such as the region or environment, and further on the service life, but is generally set to 0.05 to 0.3 mm. The agricultural folded film 11 is made of a polyolefin resin, which is a homopolymer of α-olefin or a copolymer with a different monomer having α-olefin as the main component, such as a propylene homopolymer, a propylene polymer which is a copolymer with ethylene, 1-butylene, 1-pentene, or 1-hexene, or an ethylene homopolymer, a copolymer with 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, or vinyl acetate, and these resins may be used alone or in a mixture of two or more kinds.

[0034] The agricultural film 13 produced by the inflation method is first extruded from an inflation die 15 attached to an extruder, and air is pumped in from the inside to expand the film to a specified width, and immediately after molding, the film is formed into a cylindrical shape. The raw film formed into a long cylindrical shape by the inflation method is sandwiched between pinch rolls 17 and taken up, and is flattened into a strip 19 of a certain width (see FIG. 2). Note that the strip 19 shown in FIG. 2 is shown flat with a space therebetween to explain the present invention, but in reality, the strips are in close contact with each other. In other words, the strip 19 has two folds, and both ends 21 are formed in the width direction at the left and right positions in the figure, and the upper film 23 and the lower film 25 overlap (see FIG. 2). The strip 19 is stretched around a number of guide rolls 27 provided at predetermined positions on the transport path, and is transported sequentially to the drip-proof film forming section, cutting section, and folding section downstream in the transport direction, and is wound up as the agricultural film folding body 11 at the final winding section.

[0035] [Drip-proof film formation process] A coating type anti-drip agent or other modifier is applied to one side of the film of the folded agricultural film 11 as desired, forming a coating film having anti-drip properties. The inner layer during inflation molding generally becomes the outer layer when used in greenhouse cultivation. That is, the anti-drip coating film 29 (see FIG. 2) is formed on the outer layer during inflation molding. The process of applying the coating type anti-drip agent is performed before the film is cut and folded. That is, after corona discharge treatment is performed by a corona treatment machine 31 on both the upper and lower sides that will be the outer peripheral surfaces when the film is made into a strip 19, the film passes through a coating device 33 equipped with a tank containing a modifier such as an anti-drip agent, and is dried by a drying device 35 to form a coating film on the film surface. Although one extruder is used in FIG. 1, a multi-layer inflation method using multiple extruders may be used.

[0036] The drip-proof coating film 29 is made of an inorganic colloid sol and a thermoplastic resin binder, and is used, for example, as a dispersion liquid in which an inorganic colloid sol is dispersed in a thermoplastic resin binder. Examples of inorganic colloidal sols include silica sol, alumina sol, and mixtures thereof. Examples of silica sols include spherical or chain-like colloidal silica, and those with an average particle size of 5 to 200 nm, preferably 10 to 130 nm, are used. Examples of such sols include Snowtex 20, Snowtex XL, and Snowtex UP (trade names: manufactured by Nissan Chemical Industries, Ltd.). Examples of alumina sols include spherical, feathery, and rod-like alumina hydrates with colloidal sizes of 5 to 200 nm, and examples of such sols include Alumina Sol-100 and Alumina Sol-200 (trade names: manufactured by Nissan Chemical Industries, Ltd.).

[0037] The thermoplastic resin binder may be any that can fix the inorganic colloidal sol to the outer layer of the film, and examples of such resin binders include urethane resins, acrylic resins, and acrylic-modified urethane resins, and in particular, aqueous acrylic-modified urethane resins are preferred. As the aqueous acrylic-modified urethane resin, polyester-based anionic ones are preferred, and for example, they can be produced by polymerizing a hydroxyl-containing acrylic compound in the presence of polyester-based anionic aqueous urethane resin, and then reacting with an active isocyanate compound.

[0038] The dispersion liquid forming the drip-proof coating film 29 may contain a silicone surfactant or a fluorosurfactant as necessary to improve dispersibility and application properties, or as an antifoaming agent. Examples of silicone surfactants include polyether-modified silicone, polyglycerin-modified silicone, and alkyl-polyether co-modified silicone, while examples of fluorosurfactants include surfactants having a fluoroalkyl group or a fluoroalkenyl group. These surfactants are blended in an amount of 0.01 to 2% by weight relative to the dispersion liquid. The ratio of the inorganic colloidal sol to the thermoplastic resin binder is preferably in the range of 9:1 to 3:7 in terms of solid weight ratio. If the ratio of the thermoplastic resin binder is less than this, the adhesion between the drip-proof coating film 29 and the film surface becomes insufficient, and if the ratio of the inorganic colloidal sol is less than this, sufficient drip-proofness cannot be obtained.

[0039] The drip-proof coating film 29 is formed by applying a dispersion liquid in which an inorganic colloidal sol is dispersed in a thermoplastic resin binder, for example, by a dipping method or a coating method using a gravure coater, a reverse roll coater, an air knife coater, or the like. A dilution liquid is supplied to the vicinity of the bent part of the film, and the dispersion liquid applied to the bent part of the film is diluted to reduce its concentration. The dilution liquid is then applied onto the outer layer of the cylindrical laminate film obtained by the above method, and the coating is then formed by drying with hot air at a temperature of about 50 to 150°C (dilution method). As another method, a dispersion liquid obtained by dispersing an inorganic colloidal sol in a thermoplastic resin binder using the above-mentioned coating method may be applied onto the outer layer of the tubular laminate film obtained by the above-mentioned method, and then air may be blown onto the bent portion of the tubular laminate film to blow off excess dispersion liquid, followed by hot air drying at a temperature of about 50 to 150°C to form the film (air method). As another method, a dispersion obtained by dispersing an inorganic colloidal sol in a thermoplastic resin binder using the above-mentioned coating method may be applied onto the outer layer of the tubular laminate film obtained by the above-mentioned method, and then the coating liquid may be further scraped off from the curved portion of the tubular laminate film, followed by drying with hot air at a temperature of about 50 to 150°C to form a multi-layered film (multi-layer method).

[0040] The average thickness of the drip-proof coating film 29 after drying formed by the above method varies depending on the type of drip-proof coating film 29 and the required drip-proof performance, but is preferably 0.3 to 5 μm, and more preferably 0.5 to 2 μm.

[0041] It is preferable that the thickness of the drip-proof coating 29 at the bent portion be as close as possible to the average thickness of the flat portion, but it is preferable to keep the thickness at least two times the average thickness of the flat portion in order to reduce the occurrence of tears at the folds during long-term use of the film. Moreover, it is preferable for ensuring drip-proof performance that the thickness of the coating film at the bent portion is at least 0.5 times the average thickness of the flat portion.

[0042] During the production of the above film, various additives may be added to impart functions to the film itself, such as various drip-proofing agents, heat retaining agents such as hydrotalcites and aluminum silicate, anti-fog agents, heat stabilizers, antioxidants, hindered amine-based light stabilizers, ultraviolet absorbers, and slip agents.

[0043] The manufacturing method for the folded agricultural film 11 according to this embodiment includes a flattening step of flattening the above-mentioned long tubular film to form a two-layered strip 19 of a certain width, and a drip-proof film forming step of forming a drip-proof film on the outer periphery of the two-layered strip 19. In addition to this, the manufacturing method for the folded agricultural film 11 includes a cutting step and a folding step.

[0044] [Cutting process] In the cutting step, one layer of the two-layered strip 19 is cut along the longitudinal direction. The strip 19 on which the drip-proof coating film 29 has been formed is partially cut along the longitudinal direction, which is the conveying direction, in a cutting and folding device 37 using a cutting means such as a cutter 39. This cutting is performed by cutting one of the lower film 25 or the upper film 23 of the strip 19 at a predetermined position in the width direction, for example, approximately at the center, along the longitudinal direction, which is the molding direction of the strip 19, using the cutter 39 arranged on the outside and a cutting support plate (not shown) arranged on the inside to make a slit 41 (FIG. 2).

[0045] [Folding process] FIG. 2 is a process diagram showing a folding procedure of the agricultural folded film 11 according to the first embodiment. In the folding process, the strip 19 is folded at least once along the longitudinal direction so that both end edges 43 (see FIG. 3) are not positioned in the outermost layer after folding, and so that both end edges 43 are in contact with or close to each other (see FIG. 3). In the manufacturing method of the agricultural folded film 11 according to this embodiment, both mountain folds 45, which are both end portions 21 in the width direction of the strip 19, are made to face each other and overlap both end edges 43, and folded four times. The strip 19 with the slit 41 is folded by a folding support (not shown) or the like at both mountain folds 45 that are equidistant from the slit 41 so that the slit 41 is on the inside. For example, by providing a pinch roll (not shown) whose axis direction is perpendicular to the guide roll 27 that guides the transport of the strip 19, the slit 41 is folded while valley folding inward after passing through the guide roll 27 after the slit is formed. As a result, the strip 19 becomes a four-layered agricultural film folding body 11 with four folds.

[0046] FIG. 3 is an enlarged perspective view of a main part of the folded agricultural film 11 according to the first embodiment. The agricultural folded film 11 according to this embodiment is formed into a belt-like shape by folding the agricultural film 13 multiple times in the width direction. The agricultural film 13 has a drip-proof coating 29 on at least one surface, and is folded so that both end edges 43 in the width direction of the agricultural film 13 abut or are close to each other at approximately the center in the width direction of the agricultural folded film body 11, and the agricultural film 13 is folded so that both end edges 43 are not positioned in the outermost layer of the agricultural folded film body 11. In this four-layered agricultural folded film body 11, both end edges 43 are positioned in the third layer from the top in FIG. 3.

[0047] FIG. 4 is a perspective view of a roll of the agricultural film 11 according to the first embodiment. The agricultural folded film 11 obtained as described above is wound into a roll. That is, the film folded four times is wound around a paper tube 49 by a winding machine 47 into a roll-shaped wound body. This rolled agricultural folded film 11 becomes the original roll before being opened for storage and transportation.

[0048] When the agricultural folded film 11 thus constructed is deployed in an agricultural greenhouse, the roll-shaped film is unwound and unrolled, and the folded films that are in close contact with each other are pulled apart from each other to open and deploy the film.

[0049] FIG. 5 is an explanatory diagram showing the relationship between the positions of the mountain folds 45 and the valley folds 51 of the folded agricultural film 11 according to the first embodiment and the position of a greenhouse 53. As shown in FIG. The agricultural film 13, in which the folded agricultural film body 11 is unfolded into a single layer, has valley folds 51 or mountain folds 45 located at the boundaries where the width is divided into eight equal parts, except for the center portion (4 / 8 position, between W4 and W5 in FIG. 5). In FIG. 5, the valley folds 51 are shown as inverted triangles, and the mountain folds 45 are shown as triangles. In this embodiment, the valley folds 51 are located 1 / 8 of the way from both end edges 43 of the agricultural film 13. These valley folds 51 will be placed on the side surfaces 55 of the greenhouse when the agricultural film 13 is stretched out.

[0050] The agricultural film folding body 11 is such that the valley fold portion 51 (valley fold portion 51) on one side having the drip-proof coating film 29 is valley folded so that the valley fold portion 51 becomes the house side surface 55, and is positioned within 1 / 5 of the width from either edge of the agricultural film 13 in the width direction. If the symbols W1 to W8 in FIG. 5 are applied to the four layers of the folded body 11 shown in FIG. 6 in a folded state, then from the top, W3 and W6 are located in the first layer, W2 and W7 in the second layer, W1 and W8 in the third layer, and W4 and W5 in the fourth layer.

[0051] FIG. 6 is an explanatory diagram showing a method for unfolding the folded agricultural film 11 according to the first embodiment. The agricultural film folded body 11 is prepared in a rolled state on the gable surface of the house 53. The agricultural film folded body 11 is placed on the roof 57 of the house 53 in the rolled state described above, and is unwound in the direction along the ridge along the roof 57. Next, the folded body 11 placed on the top (ridge) of the roof 57 is unfolded by lowering the end edge 43 while opening both sides. The agricultural film folded body 11 is a so-called double-door product. The double-door agricultural film folded body 11 can be unfolded even in a long house 53 or a large house 53 with a wide opening. In a house 53 with a low ceiling, it may be possible to unfold the film while opening it from both sides without climbing up to the house 53.

[0052] In the manufacturing method of the folded agricultural film 11 described above, the number of folds in the folding step can be any number n. In this case, in the cutting step, one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43, as in the above. In the folding step, when folding n times from both mountain folds 45 that become both end portions 21 in the width direction of the strip 19, valley folds are repeated n times toward both end edges 43 from a position from both end portions 21 that is a length obtained by multiplying 1 / (n+1) by 1 / 2. The mountain folds 45 of both end portions 21 are folded toward both end edges 43 while rolling them inward, and folded ((n+1)×2) times. Here, n is a natural number.

[0053] Next, the operation of the above-mentioned configuration will be described. In the folded agricultural film 11 according to this embodiment, a drip-proof coating film 29 is formed on one surface of the agricultural film 13. The agricultural film 13 is stretched so that the drip-proof coating film 29 is on the inside of the greenhouse 53. The agricultural film 13 is folded so that both end edges 43 in the width direction are abutting or close to each other at approximately the center in the width direction. In other words, the agricultural film 13, which has been crushed from a tube into a strip, has both end edges 43 disposed at approximately the center in the width direction, with a slit 41 between them. At this time, the drip-proof coating film 29 is formed on the outer peripheral surface of the agricultural film 13 that has become the strip 19.

[0054] The agricultural film 13 is folded so that both end edges 43 are not located in the outermost layer to become the agricultural folded film 11. For example, the strip 19 may be folded four times so that both widthwise ends 21 (mountain folds 45) sandwiching both end edges 43 overlap both end edges 43, or folded four times so that one end 21 (mountain fold 45) in the widthwise direction overlaps the other end 21 (mountain fold 45) to cover both end edges 43. The agricultural folded film 11 can be made even more compact and easier to unfold depending on the folding positions and number of folds.

[0055] The agricultural folded film 11 folded in this manner has one surface that becomes the drip-proof coating film 29. Therefore, the agricultural folded film 11 can be unfolded from the outside of the greenhouse 53 with the drip-proof coating film 29 facing the inside of the greenhouse, for example, by unfolding it in order starting from the outer mountain fold 45. In other words, the agricultural folded film 11 can be easily unfolded from a compactly folded state, unfolding on both sides like a gusset fold.

[0056] The folded agricultural film 11 is unfolded with its approximate center in the width direction aligned with the ridge of the greenhouse 53. At this time, the folded agricultural film 11 has both end edges 43 arranged in the approximate center in the width direction, and both end portions 21 in the width direction become mountain folds 45. When unfolded, the mountain folds 45 are in a direction in which the drip-proof coating film 29 formed on the outer peripheral surface is compressed, making them less likely to crack. On the other hand, the valley folds 51 are in a direction in which the drip-proof coating film 29 formed on the outer peripheral surface is pulled, making them more likely to crack.

[0057] Therefore, in the agricultural folded film 11, both end edges 43 sandwiching the slit 41 can be arranged along the ridge, so that the mountain folds 45 can be easily arranged on the roof 57. In other words, the valley folds 51 can be arranged on the greenhouse side surfaces 55. This makes it possible to suppress the occurrence of cracks in the roof 57, which deteriorates drip resistance. As a result, the film can be folded compactly while being easily unfolded, and has good drip resistance.

[0058] Strictly speaking, since the shapes of greenhouses 53 are diverse, there are cases where valley folds 51 reach roof 57. In this case, even if valley folds 51 of the folded agricultural film 11 reach roof 27, as long as they are at the end close to the shoulder portion, there is little effect on the drip-proof effect.

[0059] In addition, in this agricultural folded film 11, the portion where one surface having the drip-proof coating film 29 is valley-folded is located within 1 / 5 of the width from either one of the edges 43 in the width direction of the agricultural film 13. That is, the valley fold 51 is located away from both ends 43 located approximately in the center in the width direction. Since both ends 43, which are approximately in the center in the width direction, of the agricultural folded film 11 can be arranged, for example, on the ridge of the house 53, the valley fold 51 located away from both ends 43 is less likely to be arranged on the roof 57 after unfolding, and is more likely to be arranged on the side surface 55 of the house. This makes it possible to suppress the occurrence of cracks in the roof 57 that deteriorate the drip-proofing. As a result, the cracks that affect the drip-proofing are located on the side surface 55 of the house, so that the good drip-proofing of the house 53 can be maintained.

[0060] In addition, the agricultural folded film 11 wound into a roll is placed so that the approximate center in the direction along the winding central axis, i.e., the approximate center in the width direction of the strip 19, coincides with the ridge of the greenhouse 53. Thereafter, the roll is rolled along the ridge pipe, and the unfolded agricultural folded film 11 can be unfolded along the ridge. As a result, it can be easily unfolded even in greenhouses 53 that are long in the depth direction.

[0061] In the manufacturing method of the folded agricultural film 11, first, the agricultural film 13 formed into a cylindrical shape by the inflation method is flattened to obtain a two-layered strip 19 of a certain width. The outer peripheral surface of this strip 19 becomes the drip-proof coating film 29. One layer of the strip 19 is cut along the longitudinal direction to form a slit 41. Both sides of the slit 41 become both end edges 43 of the strip 19. The strip 19 is folded at least once along the longitudinal direction so that both end edges 43 abut or are close to each other and the slit 41 does not open.

[0062] The folded agricultural film 11 folded in this manner has one of its outer surfaces, i.e., the drip-proof coating film 29. Therefore, by unfolding the folded agricultural film 11 in order, for example, starting from the mountain fold 45 located on the outer side in the width direction, the folded agricultural film 11 can be unfolded from the outside of the greenhouse 53 with the drip-proof coating film 29 facing the inside of the greenhouse. In other words, the folded agricultural film 11 can be easily unfolded by unfolding it on both sides from its compactly folded state.

[0063] In addition, the folded agricultural film body 11 has both end edges 43 disposed approximately in the center in the width direction, and both end portions 21 in the width direction are mountain folds 45. The folded agricultural film body 11 has both end edges 43 sandwiching the slit 41 disposed along the ridge, which makes it easy to arrange both end portions 21 that become mountain folds 45 on the roof 57. In other words, after unfolding, the valley folds 51 can be arranged on the greenhouse side surfaces 55. The manufacturing method for the folded agricultural film body 11 according to this embodiment makes it possible to manufacture an easily unfoldable folded agricultural film body 11 that can be unfolded on both sides in the width direction of the frontage of the greenhouse 53 like a gusset fold without the need for turning it over after being placed near the ridge of the greenhouse 53.

[0064] In the manufacturing method of the agricultural folded film 11 according to this embodiment, a two-layer strip 19 is obtained by flattening a cylindrical film to a fixed width, and a slit 41 is made in one layer of the two-layer strip 19 in the longitudinal direction at approximately the center in the width direction. The outer periphery of this two-layer strip 19 becomes the drip-proof coating film 29. The two-layer strip 19 can be unfolded into one sheet from the slit 41 by holding both end edges 43.

[0065] In the folding process of the agricultural folded film 11, the two mountain folds 45, which are both ends 21 in the width direction of the two-layered strip 19, are placed opposite each other and folded four times at both end edges 43. That is, the two-layered strip 19 is further folded on the left and right sides sandwiching the slit 41 to form four layers.

[0066] This folded agricultural film 11 can be made compact by further folding the two-layered strip 19 into four layers, so that the width after folding is 1 / 4 of the width of one sheet of agricultural film 13. In this folded agricultural film 11, the valley fold 51 can be located 1 / 8 of the way from the edge 53 when the total width of the film is taken as 1. In other words, the valley fold 51 can be located close to the edge 53 and away from the center in the width direction of the agricultural film 13, making it easy to arrange it on the side surface 55 of the greenhouse.

[0067] Furthermore, in the manufacturing method of this agricultural folded film 11, a two-layered strip 19 is obtained by flattening a cylindrical film to a fixed width, and one of the layers is slit 41 in the longitudinal direction at approximately the center in the width direction. When strip 19 is folded n times from both mountain folds 45 that become both widthwise ends 21, the length from both ends 21 is determined to be 1 / (n+1) multiplied by 1 / 2. Valley folds are repeated n times on both end edges 43, and both mountain folds 45 are rolled in while folding toward both end edges 43, resulting in ((n+1)×2) folds.

[0068] By forming this agricultural folded film 11 into ((n+1)×2) layers, the width after folding can be made compact by multiplying the width of one sheet of agricultural film 13 by 1 / 2 (n+1). As a result, by folding symmetrically so as to wrap the left and right sides any n times around both end edges 43 obtained in the cutting process, the agricultural film 13 can be folded to a desired compactness and ease of unfolding with a length of 1 / (n+1) x 1 / 2 of the width. This improves portability.

[0069] [Second embodiment] Next, a second embodiment of the present invention will be described. FIG. 7 is a process diagram showing the folding procedure of the agricultural folded film 59 according to the second embodiment, FIG. 8 is an explanatory diagram showing the relationship between the positions of the mountain fold 45 and the valley fold 51 of the agricultural folded film 59 according to the second embodiment and the position of the house 53, and FIG. 9 is an explanatory diagram showing a method of unfolding the agricultural folded film 59 according to the second embodiment. In the second embodiment, the same members and parts as those shown in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0070] In the manufacturing method of the second embodiment, the folded agricultural film 59 is manufactured by cutting, in a cutting step, one of the mountain folds 45, which becomes both widthwise ends 21 of the strip 19, along the longitudinal direction of the strip 19 at a position 1 / 4 of the width to form both end edges 43. In a folding step, the strip 19 is folded four times so that both end edges 43 are positioned on the inside and both mountain folds 45 are aligned and overlapped.

[0071] In the manufacturing method of this agricultural folded film 59, a slit 41 is made along the longitudinal direction of the strip 19 at a position 1 / 4 of the width from one of the two mountain folds 45 that form both widthwise ends 21 of the strip 19 to form both end edges 43. The strip 19 with the slit 41 made at a position 1 / 4 of the width from one mountain fold 45 is folded four times with both end edges 43 sandwiching the slit 41 positioned on the inside and both mountain folds 45 aligned and overlapping.

[0072] As shown in FIG. 8, the agricultural film 13 in which the folded agricultural film 59 is unfolded into a single layer has valley folds 51 or mountain folds 45 located at the boundaries where the width direction is divided into eight equal parts, except for the central part (positions W4 and W5 in FIG. 8). In this embodiment, the valley folds 51 are located at 1 / 8 of the way from one edge 53 (right side in FIG. 8) of the agricultural film 13. This valley fold 51 will be located on the side surface 55 of the house after unfolding. As shown in FIG. 9, the folded agricultural film 59 unfolds from the rolled state in the direction along the ridge along the roof 57 of the house 53. Next, the folded agricultural film 59 placed on the roof 57 is unfolded by lowering it while opening it on both sides. If the symbols W1 to W8 in FIG. 8 are applied to the four layers of the folded body 59 shown in FIG. 9 in a folded state, then from the top, W3 and W2 are located in the first layer, W8 and W1 in the second layer, W7 and W6 in the third layer, and W4 and W5 in the fourth layer.

[0073] In this agricultural film folding body 59, the two-layered strip 19 is further folded to form four layers so that both mountain folds 45 are aligned, so that the width after folding is 1 / 4 of the width of one sheet of the agricultural film 13, making it compact. In this agricultural film folding body 59, the valley fold 51 can be positioned 1 / 8 from the edge 53 when the total width of the film is 1. In other words, it is easy to arrange the valley fold 51 on the side surface 55 of the house. In addition, in this agricultural film folding body 59, the number of folds from the state of the strip 19 can be limited to one, and the valley fold 51 can be located in one place. As a result, the agricultural film 13 can be folded compactly at 1 / 4 of the width length, asymmetrically across the cut both edges 43.

[0074] [Third embodiment] Next, a third embodiment of the present invention will be described. FIG. 10 is a process diagram showing the folding procedure of the agricultural folded film 61 according to the third embodiment, FIG. 11 is an explanatory diagram showing the relationship between the positions of the mountain fold 45 and the valley fold 51 of the agricultural folded film 61 according to the third embodiment and the position of the house 53, and FIG. 12 is a front view of the agricultural folded film 61 according to the third embodiment as seen from the direction along the slit 41. In the third embodiment, the same members and parts as those shown in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0075] The manufacturing method of the agricultural folded film 61 according to the third embodiment involves, in a cutting process, cutting one layer longitudinally at approximately the center in the width direction of the strip 19 to form both end edges 43, and in a folding process, folding both mountain folds 45 which become both end portions 21 in the width direction of the strip 19 at positions 1 / 3 of the way from both end portions 21 in the width direction in a direction covering both end edges 43, and folding one mountain fold 45 six times as shown in FIG. 12 so that it is inside the other mountain fold 45.

[0076] As shown in FIG. 11, the agricultural film 13 in which the folded agricultural film 61 is unfolded into a single layer has valley folds 51 or mountain folds 45 located at the boundaries where the width direction is divided into eight equal parts, except for the central part (positions W6 and W7 in FIG. 11). In this embodiment, the valley folds 51 are located at a position 1 / 12 from both end edges 43 of the agricultural film 13. After unfolding, these valley folds 51 will be located on the side surfaces 55 of the greenhouse. As shown in FIG. 12, the folded agricultural film 61 is unfolded from the rolled state in the direction along the ridge along the roof of the greenhouse 53 while remaining in the folded state. Next, the folded film 61 placed on the roof 57 is unfolded by lowering both end edges 43 while opening them to both sides. If the symbols W1 to W12 in FIG. 11 are applied to the six layers of the folded body 61 shown in FIG. 12 in the folded state, then from the top, W5 and W4 are located in the first layer, W2 and W3 in the second layer, W9 and W8 in the third layer, W10 and W11 in the fourth layer, W1 and W12 in the fifth layer, and W6 and W7 in the sixth layer.

[0077] In the manufacturing method of this folded agricultural film 61, one layer is slit in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43. The strip 19 with the slit 41 is valley-folded at a position 1 / 3 from both end edges 21 in the width direction in a direction covering both end edges 43. One mountain fold 45 is folded six times so that it is located inside the other mountain fold 45, i.e., at the valley fold 51.

[0078] This folded agricultural film 61 can be made compact by further folding the two-layered strip 19 into six layers, so that the width after folding is 1 / 6 of the width of one sheet of agricultural film 13. In this folded agricultural film 61, the valley fold 51 can be positioned 1 / 12 from the edge 43 when the total width of the film is 1. In other words, it is even easier to arrange the valley fold 51 on the greenhouse side surface 55. As a result, the agricultural film 13 can be folded even more compactly by folding the left and right sides together at 1 / 6 of the width, sandwiching the cut end edges 43.

[0079] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described. FIG. 13 is a process diagram showing the folding procedure of the agricultural folded film 63 according to the fourth embodiment, FIG. 14 is an explanatory diagram showing the relationship between the positions of the mountain fold 45 and the valley fold 51 of the agricultural folded film 63 according to the fourth embodiment and the position of the house 53, and FIG. 15 is a front view of the agricultural folded film 63 according to the fourth embodiment as seen from the direction along the slit 41. In the fourth embodiment, the same members and parts as those shown in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0080] In the manufacturing method of the fourth embodiment, the agricultural folded film 63 is folded six times as shown in FIG. 15 by cutting one layer longitudinally at approximately the center in the width direction of the strip 19 to form both end edges 43 in the cutting process, and folding both mountain folds 45 which become both end portions 21 in the width direction of the strip 19 at a position 1 / 6 from both end portions 21 in the width direction toward both end edges 43 and folding further at a position 2 / 6 from both end edges 43 so that the mountain folds 45 at the 1 / 6 position face each other and overlap both end edges 43.

[0081] As shown in FIG. 14, the agricultural film 13 in which the folded agricultural film body 63 is unfolded into a single layer has valley folds 51 or mountain folds 45 located at the boundaries that divide the width into 12 equal parts, except for the center (positions W6 and W7 in FIG. 14). In this embodiment, the valley folds 51 are located at positions 1 / 12 and 2 / 12 from both end edges 43 of the agricultural film 13. These valley folds 51 are to be disposed on the side surfaces 55 of the greenhouse. The folded agricultural film body 63 is unfolded from the rolled state in the direction along the ridge along the roof 57 of the greenhouse 53 while remaining in the folded state. Next, the film placed on the roof 57 is unfolded by lowering both end edges 43 while opening them to both sides. If the symbols W1 to W12 in FIG. 14 are applied to the six layers of the folded body 63 shown in FIG. 15 in a folded state, then from the top, W5 and W8 are located in the first layer, W2 and W11 in the second layer, W3 and W10 in the third layer, W4 and W9 in the fourth layer, W1 and W12 in the fifth layer, and W6 and W7 in the sixth layer.

[0082] In the manufacturing method for this folded agricultural film 63, one layer is slit 41 in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43. The strip 19 is folded at both mountain folds 45, which become both end portions 21 in the width direction, toward both end edges 43 at positions 1 / 6 from both end portions 21 in the width direction. The strip 19 is further folded at positions 2 / 6 from both end edges 43, and the mountain folds 45 at the 1 / 6 position are folded so as to face each other and overlap both end edges 43, thereby folding the strip six times.

[0083] This folded agricultural film 63 can be made compact by further folding the two-layered strip 19 into six layers, so that the width after folding is 1 / 6 of the width of one sheet of the agricultural film 13. In this folded agricultural film 63, the valley fold 51 can be positioned 1 / 6 from the end edge 43 when the total width of the film is taken as 1. In other words, the valley fold 51 can be more easily positioned on the greenhouse side surface 55. As a result, the agricultural film 13 can be folded symmetrically at 1 / 6 of the width by wrapping the left and right sides twice around both cut end edges 43, making it more compact and easier to unfold.

[0084] [Fifth embodiment] Next, a fifth embodiment of the present invention will be described. FIG. 16 is a process diagram showing the folding procedure of the agricultural folded film 65 according to the fifth embodiment, FIG. 17 is an explanatory diagram showing the relationship between the positions of the mountain fold 45 and the valley fold 51 of the agricultural folded film 65 according to the fifth embodiment and the position of the house 53, and FIG. 18 is a front view of the agricultural folded film 65 according to the fifth embodiment as seen from the direction along the slit 41. In the fifth embodiment, the same members and parts as those shown in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0085] In the manufacturing method of the agricultural folded film 65 of the fifth embodiment, in the cutting process, one layer is cut longitudinally at approximately the center in the width direction of the strip 19 to form both end edges 43, and in the folding process, both mountain folds 45 which become both widthwise ends 21 of the strip 19 are folded toward both end edges 43 at a position 1 / 8 from both widthwise ends 21, and then at a position 2 / 8 from both ends 21, and further at a position 3 / 8 from both ends 21, so that the mountain folds 45 at the 2 / 8 position face each other and are folded so as to overlap both end edges 43, thereby folding it eight times as shown in FIG. 18.

[0086] As shown in FIG. 17, the agricultural film 13 in which the agricultural film folding body 65 is unfolded into a single layer has valley folds 51 or mountain folds 45 located at the boundaries where the width direction is divided into 16 equal parts, except for the center part (positions W8 and W9 in FIG. 17). In this embodiment, the valley folds 51 are located at positions 1 / 16, 2 / 16, and 3 / 16 from both end edges 43 of the agricultural film 13. These valley folds 51 will be located on the side surface 55 of the house after unfolding. The agricultural film folding body 65, while remaining in the folded state, is unfolded from the roll shape in the direction along the ridge along the roof 57 of the house 53. Next, the folded body 65 placed on the roof 57 is unfolded by lowering both end edges 43 while opening them on both sides. If the symbols W1 to W16 in FIG. 17 are applied to the eight layers of the folded body 63 shown in FIG. 18 in a folded state, then from the top, W7 and W10 are located in the first layer, W2 and W15 in the second layer, W5 and W12 in the third layer, W4 and W13 in the fourth layer, W3 and W14 in the fifth layer, W6 and W11 in the sixth layer, W1 and W16 in the seventh layer, and W8 and W9 in the eighth layer.

[0087] In the manufacturing method for this folded agricultural film 65, one layer is slit 41 in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43. The strip 19 is folded at both mountain folds 45, which become both end portions 21 in the width direction, toward both end edges 43 at a position 1 / 8 from both end portions 21 in the width direction. Next, it is folded at a position 2 / 8 from both end portions 21. It is further folded at a position 3 / 8 from both end portions 21, and the mountain folds 45 at the 2 / 8 position are folded to face each other and overlap both end edges 43, thereby folding it eight times.

[0088] This folded agricultural film 65 can be made compact by further folding the two-layered strip 19 into eight layers, so that the width after folding is 1 / 8 of the width of one sheet of agricultural film 13. In this folded agricultural film 65, the valley fold 51 closest to the center of the film can be located 3 / 16 of the way from the edge 43 when the total width of the film is 1. In other words, the valley fold 51 can be more easily positioned on the greenhouse side surface 55. As a result, the agricultural film 13 can be folded symmetrically at 1 / 8 of the width by wrapping the left and right sides three times around both cut end edges 43, making it more compact and easier to unfold.

[0089] [Sixth embodiment] Next, a sixth embodiment of the present invention will be described. Figure 19 is a process diagram showing the folding procedure of the agricultural folded film 67 according to the sixth embodiment, Figure 20 is an explanatory diagram showing the relationship between the positions of the mountain fold 45 and the valley fold 51 of the agricultural folded film 67 according to the sixth embodiment and the position of the house 53, and Figure 21 is a front view of the agricultural folded film 67 according to the sixth embodiment as seen from the direction along the slit 41. In the sixth embodiment, the same members and parts as those shown in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0090] The manufacturing method of the sixth embodiment of the agricultural folded film 67 includes, in a cutting step, cutting one layer longitudinally at approximately the center in the width direction of the strip 19 to form both end edges 43, and in a folding step, folding both mountain folds 45, which become both end portions 21 in the width direction of the strip 19, close to each other in a valley fold so that both end edges 43 are positioned inward and overlap with both end edges 43 to form folds 69, and further folding in a valley fold at a position intermediate between the folds 69 and the mountain folds 45, and folding the film eight times so that the folds 69 overlap with the mountain folds 45 and both end edges 43.

[0091] As shown in FIG. 20, the agricultural film 13 in which the agricultural film folding body 67 is unfolded into a single layer has valley folds 51 or mountain folds 45 located at the boundaries that divide the width direction into 16 equal parts, except for the center part (positions W8 and W9 in FIG. 20). In this embodiment, the valley folds 51 are located at positions 1 / 16, 2 / 16, and 5 / 16 from both end edges 43 of the agricultural film 13. These valley folds 51 are to be disposed on the side surfaces 55 of the greenhouse. The agricultural film folding body 67, while remaining in the folded state, is unfolded from the roll shape in the direction along the ridge along the roof 57 of the greenhouse 53. Next, the folded body 67 placed on the roof 57 is unfolded by lowering both end edges 43 while opening them to both sides. If the symbols W1 to W16 in FIG. 20 are applied to the eight layers of the folded body 67 shown in FIG. 21 in a folded state, then from the top, W7 and W10 are located in the first layer, W2 and W15 in the second layer, W3 and W14 in the third layer, W6 and W11 in the fourth layer, W5 and W12 in the fifth layer, W4 and W13 in the sixth layer, W1 and W16 in the seventh layer, and W8 and W9 in the eighth layer.

[0092] In the manufacturing method of this folded agricultural film 67, one layer is slit 41 in the longitudinal direction at approximately the center in the width direction of the strip 19 to form both end edges 43. The two-layer strip 19 is valley-folded by folding both mountain folds 45, which become both end edges 21 in the width direction, close to both mountain folds 45 so that both end edges 43 face inward and overlap with both end edges 43, to form folded parts 69. The folded parts 69 are further valley-folded at intermediate positions between the mountain folds 45 and the mountain folds 45, and folded eight times as shown in Figure 21 so that the folded parts 69, mountain folds 45 and end edges 43 overlap.

[0093] The two-layered strip 19 is further folded into eight layers to make the width of the agricultural film 13 after folding compactly. In the agricultural film 67, the valley fold 51 closest to the center of the film can be positioned at 5 / 16 from the edge 43 when the total width of the film is 1. As described above, in the case of the agricultural film 67, strictly speaking, the valley fold 51 may reach the roof 57. In this case, even if the valley fold 51 reaches the ceiling of the agricultural film 67, the impact on the drip-proof effect is small if it is at the end close to the shoulder of the house 53. In other words, the valley fold 51 can be made difficult to position on the roof 57. In other words, the shape of the house 53 is diverse, and there are various combinations of the width of the roof 57 and the height of the side 55. If the width of the roof 57 is small, the valley fold 51 may not be located at the roof 57 even in the agricultural film 67. In this way, in the agricultural film folding body 67, the agricultural film 13 is folded symmetrically in eight folds at 1 / 8 of its width, with both end edges 43 sandwiched between them, making it possible to fold it more compactly and easier to unfold.

[0094] Therefore, the folded agricultural film according to this embodiment can be folded compactly while being easily unfolded, and furthermore, has good drip-proof properties.

[0095] In addition, according to the manufacturing method of the folded agricultural film according to this embodiment, the agricultural film 13 can be folded compactly to a length of 1 / 4 or 1 / 6 of the width, and symmetrically across both end edges 43. This improves portability. [Explanation of symbols]

[0096] 11, 59, 61, 63, 65, 67...Agricultural film folding body 13...Agricultural film 19…Belt 21...Both ends 29...Drip-proof coating (drip-proof coating) 43...Both edges 45…Mountain fold 51…Valley fold 69...Bending part

Claims

1. A belt-shaped folded agricultural film formed by folding an agricultural film multiple times in the width direction, The agricultural film has a drip-proof coating film on one surface which is an outer surface in a folded state and faces the inside of a greenhouse in an unfolded state, The width of the agricultural film is set to a width that covers the roof and both side surfaces of the greenhouse, both end edges in the width direction of the agricultural film are arranged along the ridge of the greenhouse and abut or are close to a position that is approximately the center in the width direction of the agricultural film when unfolded, at approximately the center in the width direction of the folded agricultural film, and the both end edges are folded so as not to be positioned in the outermost layer of the folded agricultural film, A folded agricultural film, characterized in that the portion where the one surface having the drip-proof coating film is valley-folded is located on the side of the house when the house is expanded, and is positioned within 1 / 5 of the width from either edge of the agricultural film in the width direction.

2. A method for manufacturing a folded agricultural film of an agricultural film having a width that covers a roof and both sides of a greenhouse when unfolded, comprising: a flattening process in which the long, cylindrically shaped film is flattened to form a two-layered strip of a given width; a drip-proof film forming step of forming a drip-proof film on an outer peripheral surface of the two-layered strip; a cutting step of cutting one layer of the two-layered strip along a longitudinal direction; a folding step of folding the strip at least once along a longitudinal direction such that both end edges formed in the cutting step are not positioned in the outermost layers after folding and such that both end edges are in contact with or close to each other; Including, In the cutting step, a cut is made along the longitudinal direction of the strip at a position corresponding to 1 / 4 of the width of the strip from one of the two mountain folds that are both ends of the strip in the width direction to form the both end edges; This method for manufacturing a folded agricultural film is characterized in that, in the folding process, the valley fold is located at a position 1 / 8 of the width of the film from the end edge, which will be the position of the side of the house when the film is unfolded, and both end edges, which will be the position of the ridge of the house when the film is placed on the house, are positioned on the inside, and the film is folded four times so that both mountain folds are aligned and overlapped.

3. A method for manufacturing a folded agricultural film of an agricultural film having a width that covers a roof and both sides of a greenhouse when unfolded, comprising: a flattening process in which the long, cylindrically shaped film is flattened to form a two-layered strip of a given width; a drip-proof film forming step of forming a drip-proof film on an outer peripheral surface of the two-layered strip; a cutting step of cutting one layer of the two-layered strip along a longitudinal direction; a folding step of folding the strip at least once along a longitudinal direction such that both end edges formed in the cutting step are not positioned in the outermost layers after folding and such that both end edges are in contact with or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip to form both end edges; a method for manufacturing a folded agricultural film, characterized in that in the folding step, both mountain folds which are both ends in the width direction of the strip are valley-folded at a position 1 / 3 of the way from both ends in the width direction in a direction covering both end edges, and one mountain fold is folded six times so as to be inside the other mountain fold, and the valley folds are positioned 1 / 12 of the way from the end edges in the film width length and are positioned at the side of the greenhouse when the greenhouse is unfolded.

4. A method for manufacturing a folded agricultural film of an agricultural film having a width that covers a roof and both sides of a greenhouse when unfolded, comprising: a flattening process in which the long, cylindrically shaped film is flattened to form a two-layered strip of a given width; a drip-proof film forming step of forming a drip-proof film on an outer peripheral surface of the two-layered strip; a cutting step of cutting one layer of the two-layered strip along a longitudinal direction; a folding step of folding the strip at least once along a longitudinal direction such that both end edges formed in the cutting step are not positioned in the outermost layers after folding and such that both end edges are in contact with or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip to form both end edges; a method for manufacturing a folded agricultural film, characterized in that, in the folding step, both mountain folds which are both ends in the width direction of the strip are folded toward both end edges at a position 1 / 6 from both ends in the width direction, and further folded at a position 2 / 6 from both ends, so that the mountain folds at the 1 / 6 position face each other and overlap both end edges, thereby folding the strip six times, and the valley folds are positioned at 1 / 12 and 2 / 12 from the edges in the film width length, and are positioned at the sides of the greenhouse when the greenhouse is unfolded.

5. A method for manufacturing a folded agricultural film of an agricultural film having a width that covers a roof and both sides of a greenhouse when unfolded, comprising: a flattening process in which the long, cylindrically shaped film is flattened to form a two-layered strip of a given width; a drip-proof film forming step of forming a drip-proof film on an outer peripheral surface of the two-layered strip; a cutting step of cutting one layer of the two-layered strip along a longitudinal direction; a folding step of folding the strip at least once along a longitudinal direction such that both end edges formed in the cutting step are not positioned in the outermost layers after folding and such that both end edges are in contact with or close to each other; Including, In the cutting step, the one layer is cut in the longitudinal direction at approximately the center in the width direction of the strip to form both end edges; a method for manufacturing a folded agricultural film, wherein in the folding step, both mountain folds which are both ends in the width direction of the strip are folded toward both end edges at a position 1 / 8 from both ends in the width direction, then folded at a position 2 / 8 from both ends, and further folded at a position 3 / 8 from both ends, and the mountain folds at the 2 / 8 position are folded to face each other and overlap both end edges, thereby folding eight times, and the valley folds are positioned at 1 / 16, 2 / 16, and 3 / 16 from the edges in the film width length, and are positioned at the sides of the greenhouse when unfolded in the greenhouse.

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