JP2020080709A - Plant cultivation device and reflection sheet - Google Patents

Abstract

SOLUTION: A plant cultivation device comprises: a first member capable of mounting a cultivation tank; a second member which is arranged for the first member while providing a space; an illumination member which is arranged for the first member while providing a space, and arranged closer to the first member than the second member; a cultivation rack having a structure which has a plurality of columnar members fixing the positions of the first member and the second member; a reflection sheet which is arranged on a side face of the cultivation rack in a longitudinal direction, and has visible light reflectivity; and a fixing tool for fixing the reflection sheet to the cultivation rack, in which the fixing tool is detachable to the cultivation rack, and has a pinching structure in which the reflection sheet is fixed by pinching the sheet.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a plant cultivation device and a reflection sheet.

As a method for cultivating plants such as vegetables, for example, artificial light type cultivation utilizing artificial light such as LEDs is known. As a plant cultivation device used for artificial light type cultivation, for example, in Patent Document 1, a plurality of struts, and a cultivation rack having a mounting portion on which a cultivating tank in which plants are planted are placed, A lighting device disposed on the cultivation rack at an interval above the mounting portion, and the lighting device is attached to the cultivation rack so that the height position of the lighting device with respect to the mounting portion can be changed. Is a plant cultivation device comprising a frame-shaped frame and a plurality of straight tubular LED lighting fixtures detachably attached to the frame, wherein a pair of frame members facing each other in the frame of the lighting device is specified. There is disclosed a plant cultivation device having the lamp receiving part. It is an object of this technology to provide a plant cultivation device capable of relatively easily attaching and detaching the LED lighting device to and from the frame of the lighting device and reducing the number of parts.

Further, in Patent Document 2, in a plant cultivation device including a cultivation rack having a mounting shelf for mounting a cultivation tank in which a plant is planted, and an LED lighting device arranged at an interval above the mounting shelf. There is disclosed a plant cultivation device in which a cultivation rack is provided with a support portion for supporting the LED lighting device so that the height position of the LED lighting device with respect to the mounting shelf can be changed. This technique has an object to provide a plant cultivation device capable of adjusting the light intensity applied to a plant.

JP, 2005-8126, A JP, 2013-17397, A

For example, by arranging the reflection sheet on the side surface of the cultivation rack, the plant can be efficiently irradiated with artificial light such as an LED. As a method of disposing the reflection sheet on the side surface of the cultivation rack, for example, a method of performing eyelet processing on the reflection sheet and hooking it on a hook provided on the cultivation rack is assumed. On the other hand, if the reflection sheet is processed, for example, the manufacturing cost increases.

The present disclosure has been made in view of the above circumstances, and a main object of the present invention is to provide a plant cultivation device that can easily arrange a reflection sheet on the side surface of a cultivation rack without processing the reflection sheet. To do.

In the present disclosure, a first member capable of mounting a cultivation tank, a second member provided with a space provided for the first member, and a space provided for the first member, And a lighting rack arranged on the first member side of the second member, and a cultivation rack having a structure having a plurality of pillar members that fix the positions of the first member and the second member, Arranged on the side surface in the longitudinal direction of the cultivation rack, a reflection sheet having visible light reflectivity, and a fixture for fixing the reflection sheet to the cultivation rack, the fixture is the cultivation rack. Provided is a plant cultivation device which is detachable from the device and has a sandwiching structure for fixing the reflecting sheet by sandwiching it.

In the present disclosure, it is used to be arranged on the side surface of the cultivation rack, a reflective sheet having visible light reflectivity, having a fixture for fixing the reflective sheet to the cultivation rack, the fixing There is provided a reflection sheet in which a tool is attachable to and detachable from the cultivation rack, and has a sandwiching structure that fixes the reflection sheet by sandwiching it.

The plant cultivation device according to the present disclosure has an effect that the reflection sheet can be easily arranged on the side surface of the cultivation rack without processing the reflection sheet.

It is a schematic front view which shows an example of the cultivation rack in this indication. It is a schematic side view of FIG. It is a schematic perspective view which shows an example of the plant cultivation apparatus in this indication. It is the enlarged view which expanded the area|region R in FIG. It is explanatory drawing which illustrates the fixing tool in this indication. It is explanatory drawing which illustrates the fixing tool in this indication. It is explanatory drawing which illustrates the fixing tool in this indication. It is explanatory drawing which illustrates the fixing tool in this indication. It is explanatory drawing which illustrates the fixing tool in this indication. It is explanatory drawing which illustrates the hook in this indication. It is explanatory drawing which illustrates the fixing tool in this indication. It is explanatory drawing which illustrates the reflection sheet in this indication.

Hereinafter, the plant cultivation device and the reflection sheet according to the present disclosure will be described in detail.

A. Plant Cultivating Device A plant cultivating device according to the present disclosure will be described with reference to the drawings. 1 is a schematic front view showing an example of a cultivation rack, and FIG. 2 is a schematic side view of FIG. Further, FIG. 3 is a schematic perspective view showing an example of the plant cultivation device, and FIG. 4 is an enlarged view in which a region indicated by reference symbol R in FIG. 3 is enlarged.

As shown in FIGS. 1 and 2, the cultivation rack 10 includes a first member 12 on which a cultivation tank 11 can be placed, a second member 13 provided with a space for the first member 12, and a second member 13. A lighting member 14 arranged with a space for one member 12 and arranged closer to the first member 12 than the second member 13, and a plurality of fixing the positions of the first member 12 and the second member 13. A pillar member 15 and a structure 16 having a pillar member 15. The cultivation rack 10 in FIGS. 1 and 2 has a structure in which the structures 16 are stacked in four stages. Although not particularly shown, the cultivation rack 10 may be provided with a culture solution supply device for supplying the culture solution to the cultivation tank 11.

Moreover, as shown in FIG. 3 and FIG. 4, the plant cultivation device 100 includes a cultivation rack 10, a reflection sheet 20 arranged on a side surface of the cultivation rack 10 in the longitudinal direction LD, and having visible light reflectivity, and a reflection sheet 20. And a fixture 30 for fixing the plant to the cultivation rack 10. The fixture 30 is attachable to and detachable from the cultivation rack 10 and has a sandwiching structure for sandwiching and fixing the reflection sheet 20.

According to the present disclosure, by using a specific fixture, the reflection sheet can be easily arranged on the side surface of the cultivation rack without processing the reflection sheet. As described above, as a method of disposing the reflection sheet on the side surface of the cultivation rack, for example, a method of performing eyelet processing on the reflection sheet and hooking it on a hook provided on the cultivation rack is assumed. Alternatively, instead of eyelet processing, it is envisaged to perform processing of providing a surface fastener or a magnet. However, if these processes are performed, the manufacturing cost of a reflective sheet will increase, for example. On the other hand, in the present disclosure, since it is not necessary to process the reflective sheet, the manufacturing cost of the reflective sheet can be suppressed. Further, the reflection sheet arranged on the side surface of the cultivation rack may be soiled due to the adherence of the culture solution. The presence of eyelet processing or the like on the reflection sheet is likely to be an obstacle to cleaning when cleaning the stain on the reflection sheet. On the other hand, in the present disclosure, there is an advantage that it is easy to clean the reflection sheet because it is not necessary to process the reflection sheet and the attachment/detachment is easy.

Further, according to the present disclosure, by arranging the reflection sheet on the side surface in the longitudinal direction of the cultivation rack, the plant can be efficiently irradiated with artificial light such as an LED. In particular, by using a reflective sheet having a good diffuse reflectance, the plant can be efficiently irradiated with artificial light. As a result, the number of light sources of the lighting device can be reduced, and as a result, equipment cost and running cost can be reduced.

1. Fixture The fixture in the present disclosure is a component for fixing the reflection sheet to the cultivation rack. FIG. 5A is a schematic perspective view illustrating the fixture according to the present disclosure. FIG. 5B is a schematic cross-sectional view taken along the plane P in FIG. As shown in FIGS. 5A and 5B, the fixture 30 has a substrate 31, a movable plate 32, and a side cover 33. The shape of the fixture 30 is not particularly limited, but it is preferable to have a banner shape that is an elongated rectangle. Further, the fixture 30 has an attaching/detaching portion 34 such as a magnet and a surface fastener, and can be attached/detached to/from the cultivation rack by the attaching/detaching portion 34. Further, the fixture 30 in FIGS. 5A and 5B has a sandwiching structure including the substrate 31 and the movable plate 32, and can sandwich the reflection sheet.

The fixture in the present disclosure will be described in detail with reference to FIG. FIG. 6 is a schematic cross-sectional view showing an example of a fixture in the present disclosure, FIG. 6( a) shows a state before fixing the reflection sheet, and FIG. 6( b) shows a state after fixing the reflection sheet. Shows the state of. As shown in FIG. 6A, the fixture 30 has a substrate 31 and a movable plate 32. In addition, the fixture 30 has an attachment/detachment portion 34 that enables attachment/detachment with respect to the cultivation rack, on the surface side of the substrate 31 opposite to the movable plate 32. On the other hand, the movable plate 32 is rotatable about the rotation center C of the substrate 31, and the rotation angle θ is, for example, 60° or less, 45° or less, or 40° or less. In FIG. 6A, the reflection sheet 20 is not fixed because there is a large gap between the fixed portion 31 a of the substrate 31 and the fixed portion 32 a of the movable plate 32. On the other hand, in FIG. 6B, the movable plate 32 rotates about the rotation center C of the substrate 31, so that the fixed portion 31 a of the substrate 31 and the fixed portion 32 a of the movable plate 32 come close to each other, and The reflection sheet 20 arranged at is fixed.

The material of the fixture is not particularly limited, and examples thereof include plastic resins; metal materials such as aluminum, aluminum alloys, and stainless steel. In artificial light plant factories, it is normally expected to be used for several years. Therefore, the material of the fixture is preferably a metal material. This is because it has high durability. Further, since the artificial light plant factory has high humidity, it is preferable that the metal material is subjected to rust-prevention treatment or waterproof treatment. Further, from the viewpoint of workability, the material of the fixture is preferably lightweight. Among metallic materials, aluminum and aluminum alloys are lightweight. In particular, when aluminum or aluminum alloy is selected, it is preferable that the surface thereof be coated as waterproofing treatment. The color of the coating is not particularly limited, but white with high reflectance is preferable.

As shown in FIG. 6, the fixture 30 preferably has a substrate 31 and a movable plate 32. Further, the material of the substrate and the movable plate is preferably a metal material. It is preferable that the surface of the substrate opposite to the movable plate is flush. This is because leakage of artificial light can be suppressed. Further, the movable plate can also function as a front cover, for example. The fixture preferably has a banner shape. The banner shape means that L/H described later is greater than 1. Here, FIG. 7 is an explanatory view illustrating the fixture according to the present disclosure, and is a schematic plan view when the fixture is viewed from the direction A in FIG. 5B. As shown in FIG. 7, when the length of the fixture 30 is L, L is, for example, 30 cm or more, and may be 45 cm or more. On the other hand, L is 4 m or less, for example. As shown in FIG. 7, when the height of the fixture 30 is H, H is, for example, 2 cm or more and 8 cm or less. The value of the length L with respect to the height H (L/H) is usually larger than 1, may be 3 or more, and may be 25 or more. On the other hand, L/H is, for example, 200 or less. Further, as shown in FIG. 5B, when the width of the fixture 30 is W, W is, for example, 5 mm or more and 30 mm or less, and preferably 10 mm or more and 20 mm or less.

On the other hand, the fixture may be one that sandwiches and fixes the reflection sheet by utilizing the flexibility of the plastic resin. FIG. 8A is a schematic plan view showing an example of a fixture according to the present disclosure, and FIG. 8B is a sectional view taken along the line AA of FIG. 8A. As shown in FIGS. 8A and 8B, the fixture 30 is a plastic resin molded product 36 having a pair of fixing portions (36a, 36b) for fixing a reflection sheet (not shown). .. As such a fixture, for example, one used in a general wall calendar can be used. As such a fixture, for example, the structure described in JP-A-9-305111 can be mentioned. That is, a structure in which a hanging member having a hole is attached to the upper surface of a holding member formed by connecting two holding plates provided with a holding edge at the lower end so that the holding edges face inward is considered. Be done. Examples of the resin material include flexible hard vinyl chloride and high-impact polystyrene (HIPS) obtained by adding rubber to GPPS to give impact resistance.

Further, the fixture according to the present disclosure has an attachment/detachment portion that enables attachment/detachment with respect to the cultivation rack. It is preferable that the attachment/detachment portion be attachable/detachable to/from the second member of the cultivation rack. Examples of the attachment/detachment portion include eyelets, surface fasteners, and magnets. The fixture may have only one attachment/detachment portion, or may have a plurality of attachment/detachment portions. The plurality of attachment/detachment portions are preferably located along the longitudinal direction of the fixture.

FIG. 9A is a schematic plan view showing an example of a fixture according to the present disclosure, and FIG. 9B is a sectional view taken along the line AA of FIG. 9A. As shown in FIGS. 9A and 9B, the fixture 30 has a through hole as the attachment/detachment portion 34. On the other hand, for example, as shown in FIG. 10, the cultivation rack 10 has a hook 17 as a member for hooking the through hole. By hooking the through hole on the hook of the cultivation rack, the fixture can be attached to the cultivation rack and can be easily detached. The through hole can be formed by punching the substrate 31, for example. The fixture may have only one through hole or may have a plurality of through holes. The plurality of through holes are preferably located along the longitudinal direction of the fixture. Examples of the shape of the through hole include a circular shape and a rectangular shape.

Further, as shown in FIG. 11, the fixture 30 may have a ring as the attaching/detaching portion 34. Similar to the through hole, the fixture 30 can be attached to the cultivation rack by hooking the ring on the hook of the cultivation rack, and can also be easily detached. Examples of the material of the ring include metal. In FIG. 11, the attachment/detachment portion 34 (ring) is connected to the substrate (not shown) by the connection portion 35. The fixture may have only one ring or a plurality of rings. The plurality of rings are preferably located along the longitudinal direction of the fixture. Moreover, examples of the shape of the ring include a circular shape and a rectangular shape.

On the other hand, the member for hooking the through hole or the ring is not particularly limited, but for example, a hook can be used. Examples of the hook include a U-shaped hook and an S-shaped hook. The cultivation rack may have only one hook or a plurality of hooks. The plurality of hooks are preferably located along the longitudinal direction of the cultivation rack.

Another example of the attachment/detachment portion is a surface fastener. For example, in FIG. 5B, the fixture 30 may have a surface fastener as the attaching/detaching portion 34. On the other hand, although not shown, the cultivation rack also usually has a detachable surface fastener that can be attached to and detached from the attachment/detachment portion 34 (surface fastener). Examples of the surface fastener include a surface fastener having hook-shaped raised fibers and a surface fastener having loop-shaped raised fibers. Usually, the hook-and-loop raised hook-and-loop fastener and the loop-like raised hook-and-loop fastener are used in combination to be detachable. A general surface fastener can be used as the surface fastener.

The fixture may have only one surface fastener, or may have a plurality of fasteners. The plurality of surface fasteners are preferably located along the longitudinal direction of the fixture. Moreover, examples of the shape of the surface fastener include a square and a rectangle. Further, the surface fastener may be a banner-shaped surface fastener along the longitudinal direction of the fixture.

As a method of attaching the surface fastener to the fixture, for example, a method of attaching the surface fastener to the substrate using an adhesive agent can be mentioned.

Further, as another example of the attachment/detachment portion, a magnet can be cited. For example, in FIG. 5B, the fixture 30 may have a magnet as the attaching/detaching portion 34. A general magnet can be used as the magnet. On the other hand, although not shown, the cultivation rack also usually has a magnetic member. The member having magnetism may be a magnet or a metal sheet. Further, for example, if the structure of the cultivation rack (for example, the second member) is made of metal, the structure itself functions as a member having magnetism.

The fixture may have only one magnet or a plurality of magnets. The plurality of magnets are preferably located along the longitudinal direction of the fixture. Moreover, examples of the shape of the magnet include a square and a rectangle. Further, it may be a banner-shaped magnet along the longitudinal direction of the fixture.

As a method of mounting the magnet on the fixture, for example, a method of attaching the magnet to the substrate using an adhesive agent can be mentioned.

2. Reflective sheet The reflective sheet in the present disclosure is arranged on the side surface in the longitudinal direction of the cultivation rack. The “side surface in the longitudinal direction of the cultivation rack” refers to the side surface of the cultivation rack that is located in the longitudinal direction of the cultivation rack. The “side surface of the cultivation rack” means a surface specified by the first member, the second member and the pillar member. For example, when the shape of the cultivation rack is a rectangular parallelepiped, the four surfaces of the six surfaces excluding the top surface and the bottom surface correspond to the side surfaces of the cultivation rack. Further, the “longitudinal direction of the cultivation rack” refers to the longitudinal direction of the first member and the second member. The reflection sheet is preferably arranged so as to cover both ends of the first member and the second member on the side surface in the longitudinal direction of the cultivation rack.

The reflection sheet according to the present disclosure may be arranged on the side surface in the longitudinal direction of the cultivation rack, and for example, as shown in FIG. 3, it is preferable that the reflection sheet is arranged on the two side surfaces in the longitudinal direction of the cultivation rack 10. .. Although not shown, the reflection sheet may be arranged on only one of the side surfaces in the longitudinal direction of the cultivation rack. Further, the reflection sheet according to the present disclosure may be arranged on a lateral side surface of the cultivation rack, in addition to a lateral side surface of the cultivation rack. The shape of the reflection sheet is not particularly limited, and examples thereof include a square and a rectangle. In particular, the reflection sheet is preferably rectangular (e.g., long sheet).

The reflective sheet according to the present disclosure is not particularly limited, but preferably has at least a base material sheet containing a polyolefin resin. The base sheet is a sheet mainly responsible for the reflection function. Further, the reflection sheet preferably has a reinforcing sheet on one surface side of the base material sheet. FIG. 12 is a schematic cross-sectional view showing the reflection sheet according to the present disclosure. As shown in FIG. 12A, the reflection sheet 20 preferably has at least a base material sheet 21 containing a polyolefin resin. Further, as shown in FIG. 12B, the reflection sheet 20 preferably has a reinforcing sheet 22 on one surface side of the base sheet 21.

(1) Base Material Sheet The base material sheet preferably contains at least a polyolefin resin. Further, the base sheet preferably contains an inorganic filler. Further, the base sheet may contain additives such as a light stabilizer, an antioxidant and an ultraviolet absorber. The base sheet may be a non-stretched sheet or a stretched sheet (uniaxially stretched sheet, biaxially stretched sheet, etc.).

(Polyolefin resin)
The base sheet preferably contains a polyolefin resin. Examples of the polyolefin resin include homopolymers of olefins, copolymers of two or more kinds of olefins, copolymers of one or more kinds of olefins, and one or more kinds of polymerizable monomers capable of being polymerized with olefins. Can be mentioned. Examples of the olefin (monomer unit) include ethylene, propylene, butene, and hexene. The copolymer may be binary, ternary or quaternary. Further, the copolymer may be a random copolymer or a block copolymer.

Examples of the polyolefin resin include polyethylene resin and polypropylene resin. Examples of the polyethylene-based resin include high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and ultra-low-density polyethylene (VLDPE). These may be used alone or in combination of two or more.

Among these, high density polyethylene and linear low density polyethylene are preferable, and high density polyethylene is more preferable. This is because the high-density polyethylene is excellent in weather resistance and tensile strength, and the sheet containing the high-density polyethylene has no slack even in the case of a long roll and is unlikely to cause a defective appearance due to whitening during bending. Further, high-density polyethylene is opaque, and the addition of titanium oxide and calcium carbonate contributes to increase the whiteness of the film and, as a result, to high reflectivity.

In particular, when the resin component is only a polyethylene resin, it is preferable to use at least one of high density polyethylene and linear low density polyethylene. Further, since high-density polyethylene has excellent heat resistance and processability during processing, it is particularly suitable for sheet forming by calendering.

The polyethylene resin preferably has a melt flow rate (temperature 230° C., load 2.16 kg) measured according to JIS K 7210 of 0.1 g/10 min or more and 4.0 g/10 min or less, and 0. More preferably, it is not less than 0.4 g/10 min and not more than 2.0 g/10 min. When the melt flow rate (MFR) is within the above range, it is particularly suitable for sheet formation by calendering.

The base material sheet may contain a polyethylene resin as a main component of the resin component. The ratio of the polyethylene resin to the total amount of the resin components is, for example, 50% by mass or more, and may be 70% by mass or more.

On the other hand, examples of the polypropylene resin include homopolymer polypropylene (h-PP), random copolymer polypropylene (r-PP), block copolymer polypropylene (b-PP), and metallocene polypropylene. These may be used alone or in combination of two or more. Of these, random copolymer polypropylene is preferred. This is because the random copolymer polypropylene has flexibility as compared with the homopolymer polypropylene and the block copolymer polypropylene.

The polypropylene-based resin may be a copolymer of propylene and another α-olefin. Examples of other α-olefins include at least one of ethylene, butene-1, hexene-1, and heptene-1,4-methylpentene-1. The polypropylene resin preferably contains propylene as the main component of the monomer unit.

The polypropylene resin preferably has a melt flow rate (temperature 230° C., load 2.16 kg) measured according to JIS K 7210 of, for example, 0.1 g/10 min or more and 4.0 g/10 min or less. More preferably 0.4 g/10 min or more and 2.0 g/10 min or less. When the melt flow rate (MFR) is within the above range, it is particularly suitable for sheet formation by calendering.

The base material sheet may contain a polypropylene resin as the main component of the resin component. The ratio of the polypropylene resin to the total amount of the resin components is, for example, 50% by mass or more, and may be 70% by mass or more. The base material sheet may contain both a polypropylene resin and a polyethylene resin as a resin component.

Examples of the other polyolefin-based resin include a copolymer having at least one of an ethylene-propylene copolymer component and a polybutylene component, and a polypropylene component (so-called reactor TPO).

(Inorganic filler)
The base sheet preferably contains an inorganic filler. Examples of the inorganic filler include calcium carbonate, titanium oxide, talc, titanium oxide, titanium oxide/antimony oxide/nickel oxide solid solution, and the like. The base sheet preferably contains at least one of calcium carbonate and titanium oxide as an inorganic filler.

The content of the inorganic filler in the base material sheet is, for example, 30% by mass or more, 40% by mass or more, or 50% by mass or more, based on the polyolefin resin. If the content of the inorganic filler is too low, the whiteness and light reflectivity of the base sheet may be lowered. On the other hand, the content of the inorganic filler is, for example, 80% by mass or less, 75% by mass or less, or 70% by mass or less, based on the polyolefin resin. If the content of the inorganic filler is too large, the flexibility of the base sheet may be reduced.

(Additive)
The base sheet preferably contains at least one of a light stabilizer, an antioxidant and an ultraviolet absorber as an additive.

Examples of the light stabilizer include hindered amine light stabilizers, and among them, NOR hindered amine light stabilizers are preferable. The NOR-type hindered amine light stabilizer has good acid resistance and greatly improves weather resistance.

Specific examples of the NOR-type hindered amine light stabilizers include, for example, ADEKA STAB LA-81 manufactured by ADEKA and TINUVIN 123 (bis(2,2,6,6-tetramethyl-1-(octyloxy)decanedioate) manufactured by BASF. )-4-Piperidinyl)ester) and the like.

The content of the light stabilizer in the substrate sheet is, for example, 0.05% by mass or more, may be 0.1% by mass or more, and is 0.4% by mass or more, based on the polyolefin resin. Good. If the content of the light stabilizer is too small, the weather resistance of the base sheet may not be improved. On the other hand, the content of the light stabilizer in the base material sheet is, for example, 3.0% by mass or less, may be 1.0% by mass or less, or 0.5% by mass or less, based on the polyolefin resin. It may be. When the content of the light stabilizer is too large, the production unit price may increase.

Examples of antioxidants include phenolic antioxidants and phosphorus antioxidants. Examples of the phenolic antioxidant include pentaerythritol tetrakis [3-(3,5-di-t-butyl-4-hydroxyphenyl)propinate], 2,6-di-t-butyl-4-methylphenol, 4,4'-methylene-bis(2,6-di-t-butyl)phenol, 4,4'-butylidene-bis(6-t-butyl-3-methyl)phenol, 2,2-methylene-bis( 6-t-butyl-3-methyl)phenol, 2,2-methylene-bis(4-methyl-6-t-butyl)phenol, 4,4'-thiobis(2-methyl-6-t-butyl)phenol , 4,4'-thiobis(3-methyl-2-t-butyl)phenol, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4hydroxybenzyl) Examples thereof include benzene, 3,5-t-butyl-4-hydroxy-α-hydroxybenzene, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.

On the other hand, examples of the phosphorus-based antioxidant include trisnonylphenyl phosphite, tris(2,4-ditert-butylphenyl)phosphite, tris[2-tert-butyl-4-(3-tert-butyl-phosphite). 4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecylphosphite, octyldiphenylphosphite, di(decyl)monophenylphosphite, di(tridecyl)pentaerythritol diphosphite, distearyl Pentaerythritol diphosphite, di(nonylphenyl) pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl) ) Pentaerythritol diphosphite, bis(2,4,6-tritert-butylphenyl)pentaerythritol diphosphite, tetra(tridecyl)isopropylidene diphenol diphosphite, tetra(tridecyl)-4,4'-n -Butylidene bis(2-tert-butyl-5-methylphenol) diphosphite, hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane triphosphite, tetrakis( 2,4-ditert-butylphenyl)biphenylene diphosphonite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, tris(2-[(2,4,8,10 -Tetrakis-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)oxy]ethyl)amine and the like.

The content of the antioxidant in the base material sheet is, for example, 0.05% by mass or more, may be 0.1% by mass or more, and is 0.4% by mass or more with respect to the polyolefin resin. Good. If the content of the antioxidant is too low, the weather resistance of the base sheet may not be improved. On the other hand, the content of the antioxidant in the base material sheet is, for example, 5.0% by mass or less, may be 3.0% by mass or less, and is 1.0% by mass or less with respect to the polyolefin resin. It may be. If the content of the antioxidant is too large, it may lead to poor appearance due to bleed-out.

Examples of the UV absorber include benzotriazole UV absorbers, triazine UV absorbers, benzophenone UV absorbers, salicylate UV absorbers, and cyanoacrylate UV absorbers. Furthermore, examples of the benzotriazole-based ultraviolet absorber include 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-3,5-ditert-butylphenyl)benzotriazole, 2- (2-Hydroxy-3,5-ditert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-( 2-Hydroxy-3-tert-butyl-5-carboctoxyethylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-dioctane) Examples thereof include 2-hydroxyphenylbenzotriazole compounds such as milphenyl)benzotriazole and 2,2′-methylenebis(4-tertiaryoctyl-6-benzotriazolylphenol).

The content of the ultraviolet absorber in the base material sheet is, for example, 0.05% by mass or more, may be 0.1% by mass or more, and is 0.4% by mass or more, based on the polyolefin resin. Good. If the content of the ultraviolet absorber is too low, the weather resistance of the base sheet may not be improved. On the other hand, the content of the ultraviolet absorber in the base material sheet is, for example, 5.0% by mass or less, may be 3.0% by mass or less, and is 1.0% by mass or less with respect to the polyolefin resin. It may be. If the content of the ultraviolet absorber is too large, it may lead to poor appearance due to bleed-out and, depending on the type of the ultraviolet absorber, poor appearance due to coloring.

The base sheet may contain a heavy metal deactivator. When the base sheet comes into contact with, for example, an iron pipe or the like, the polyolefin-based resin may be decomposed due to the influence of a heavy metal element (for example, Fe element) contained in the iron pipe. Specifically, the heavy metal element forms an oxide, and the catalytic action of the oxide may decompose the polyolefin resin. Examples of the heavy metal element include Fe element, Cu element, Mn element, and Zn element.

Heavy metal deactivators are known as copper damage inhibitors. The heavy metal deactivator is not particularly limited, and examples thereof include an oxalic acid derivative, a salicylic acid derivative, and a hydrazide derivative, and more specifically, trade names Eastman Inhibitor OAB H (manufactured by Eastman Kodak Co., Ltd.), Adekastab CDA-1 , CDA-6 (manufactured by ADEKA CORPORATION), Chel-180, Inganox MD 1024 (manufactured by BASF Corporation) and the like. Further, JP-B-37-14484, JP-B-39-9072, JP-B-39-12454, JP-B-39-19541, JP-B-40-12293, and JP-B-40-18852, JP-B-42-4356, JP-B-42-4596, JP-B-42-13247, JP-B-43-6538, JP-B-43-18606, JP-B-47-27624, JP-B-47-24 48-36837, JP-B-49-15466, JP-B-52-22834, JP-B-54-43537, JP-B-54-90143, US Pat. No. 3,357,944, US Pat. It may be exemplified by the specification, French Patent No. 1481105, French Patent No. 1495830, and the like.

The content of the heavy metal deactivator in the base material sheet is, for example, 0.05 mass% or more, may be 0.1 mass% or more, and is 0.4 mass% or more with respect to the polyolefin resin. May be. If the content of the heavy metal deactivator is too low, copper damage may not be sufficiently suppressed. On the other hand, the content of the heavy metal deactivator in the base material sheet is, for example, 5.0 mass% or less, may be 3.0 mass% or less, and is 1.0 mass% or less with respect to the polyolefin resin. May be If the content of the heavy metal deactivator is too large, it may lead to poor appearance due to poor dispersion.

The base sheet may contain an appropriate amount of known additives such as a lubricant, a heat stabilizer, a pigment, a modifier, a flame retardant, an antistatic agent, a reinforcing agent and an antifungal agent.

(Base material sheet)
The substrate sheet may be a sheet having no voids inside or a sheet having voids inside (a porous substrate sheet). The base sheet may have a single-layer structure or a multi-layer structure. When the substrate sheet has a multilayer structure, the resin components contained in each layer may be the same or different. As an example of the base material sheet having a multi-layer structure, an inner layer and two outer layers located on both sides of the inner layer are included, and the resin components contained in the two outer layers are the same, and the resin components contained in the outer layer are the same. Examples of the base sheet include different resin components contained in the inner layer.

The base sheet preferably has a high visible light reflectance. The average reflectance of visible light (wavelength 380 nm or more and 780 nm or less) is, for example, 70% or more, preferably 80% or more, and more preferably 90% or more. The visible light reflectance was measured using an ultraviolet/visible/near-infrared spectrophotometer (Shimadzu UV-3600) and an integrating sphere accessory (ISR-3100) at an incident angle of 8° in the visible range of 380 nm to 780 nm. It is obtained by measuring the reflectance (total reflectance) and determining the average reflectance.

The thickness of the base sheet is not particularly limited, but may be, for example, 25 μm or more, 30 μm or more, or 40 μm or more. On the other hand, the thickness of the base material sheet is, for example, 90 μm or less, and may be 80 μm or less. When the thickness of the base material sheet is within the above range, for example, when the base material sheet is produced by calendering, a sheet having excellent surface smoothness and high thickness accuracy can be obtained.

(Method for manufacturing base material sheet)
The method for producing the substrate sheet is not particularly limited as long as it is a method for obtaining the desired substrate sheet, for example, a step of producing a resin composition containing at least a polyolefin resin, and the resin composition sheet And a film forming process to produce a base material sheet.

The method for producing the resin composition is not particularly limited, but a method for producing a resin composition by melting and kneading a predetermined amount of each raw material is preferable. Examples of the apparatus used for melt-kneading include a continuous kneader, a Banbury mixer, a kneader, and an extruder. The heating temperature at the time of melt-kneading is, for example, 150° C. or higher and 200° C. or lower.

Examples of the method for forming the resin composition into a sheet include known molding methods such as calendering and extrusion molding, and calendering is particularly preferable. This is because, for example, when the sheet is thin, it is suitable for producing a sheet having a uniform thickness. In addition, the calender molding is suitable because it is easy to cope with the size and the kind of the resin due to the structure of the molding machine, and it is easy to deal with a small lot. Furthermore, in the present disclosure, when a resin composition having a high content of an inorganic filler is used, it is preferable to mold it by calendering. When a large amount of an inorganic filler is contained, for example, when it is molded by extrusion molding, the surface of the obtained sheet is rough, and the sheet is likely to tear, but molding by calendering does not cause such an inconvenience, A smooth sheet can be manufactured. Furthermore, the superiority of calendering when a resin composition having a high content of an inorganic filler is used is particularly noticeable when the thickness of the substrate sheet is as thin as 30 μm or more and 70 μm or less.

In calendering, for example, the resin composition obtained by melt-kneading is supplied to a heated calender roll and rolled to obtain a base sheet. The heating temperature of the calender roll is, for example, 150° C. or higher and 220° C. or lower, and preferably 160° C. or higher and 190° C. or lower. As the calender device, an appropriate one such as a three-type, a four-L type, a four-sided L-type, a four-Z type, and a six-type may be used.

After forming the resin composition into a sheet, various surface treatments may be performed as necessary. Examples of the surface treatment include corona treatment (corona discharge treatment), plasma treatment, ultraviolet treatment, electron beam treatment (electron beam radiation treatment), and the like.

(2) Reinforcement sheet The reflection sheet may have a reinforcement sheet on one surface side of the base sheet. The reinforcing sheet is a sheet that reinforces the base sheet. The reflection sheet may have another layer between the base sheet and the reinforcing sheet, or may not have the other layer.

Examples of the reinforcing sheet include non-woven fabric and woven fabric. Among the thermoplastic resins, the material of the non-woven fabric or the woven fabric is preferably a polyolefin resin, an ester resin or an amide resin. Further, as the non-woven fabric, for example, fiber orthogonal non-woven fabric, long fiber non-woven fabric, short fiber non-woven fabric, wet non-woven fabric, dry non-woven fabric, air-laid non-woven fabric, card type non-woven fabric, parallel non-woven fabric, cross non-woven fabric, random non-woven fabric, spun bond non-woven fabric, melt blown non-woven fabric , Flash spun nonwoven fabric, chemical bond nonwoven fabric, hydroentangled nonwoven fabric, needle punched nonwoven fabric, stitch bond nonwoven fabric, thermal bond nonwoven fabric, burst fiber nonwoven fabric, tow opening nonwoven fabric, split fiber nonwoven fabric, composite nonwoven fabric, laminated nonwoven fabric, coated nonwoven fabric, laminated nonwoven fabric, etc. Is mentioned.

The fiber-orthogonal nonwoven fabric is a nonwoven fabric in which two or more stretched films are laminated so that the stretching directions are orthogonal to each other, and examples thereof include Wallif (registered trademark) manufactured by JX ANCI Corporation. The basis weight of the fiber-orthogonal nonwoven fabric is preferably 5 g/m ² or more and 100 g/m ² or less, and more preferably 20 g/m ² or more and 50 g/m ² or less. When the basis weight of the fiber-orthogonal nonwoven fabric has the above lower limit, a reinforcing sheet having sufficient strength can be obtained. The fiber diameter of the long-fiber nonwoven fabric is preferably, for example, 3 μm or more and 20 μm or less. On the other hand, the fiber diameter of the short fiber nonwoven fabric is preferably less than 3 μm, for example.

On the other hand, as another example of the reinforcing sheet, a cloth-type nonwoven fabric may be mentioned. Examples of the cloth-type nonwoven fabric include the polyolefin mesh cloth disclosed in JP-A 2007-259734. The polyolefin mesh cloth is preferably polyethylene mesh cloth. Polyethylene mesh cloth is preferably used in consideration of adhesiveness in extrusion molding, for example. The cross-type nonwoven fabric preferably has a thickness of 30 μm or more and 100 μm or less, and more preferably 50 μm or more and 80 μm or less.

The cloth-type non-woven fabric has excellent mechanical properties such as tear strength and is preferably used as a reinforcing sheet, and has an advantage that it is easy to control tension during lamination by the roll-to-roll method and curl is small. Furthermore, the cloth-type nonwoven fabric has a strength that allows edge processing, and for example, eyelets can be provided in the edge processing portion.

As the woven structure of the cross-type non-woven fabric, various shapes such as plain weave, twill weave, entangled weave, and dummy weave are used, but the plain weave is preferable from the viewpoint of smoothness.

The cross-type nonwoven fabric can be formed by weaving drawn yarns as warp and weft yarns. In the present disclosure, the cross-type nonwoven fabric has 5 or more fibers along the first fiber direction in the area of 1 inch square and 5 or more along the second fiber direction intersecting the first fiber direction. It is preferable to have fibers of If this is expressed by the shot density, it can be expressed as “5×5 lines/inch or more”. The implantation density can be, for example, 5×5 lines/inch or more, preferably 6×5 lines/inch or more, and particularly preferably 8×8 lines/inch or more. The implantation density can be, for example, 10×10/inch or less. When the implantation density has the upper limit, it is possible to suppress an increase in manufacturing cost and prevent a problem that the curl of the laminated product becomes too large.

The mesh in the cross-type nonwoven fabric is preferably 0.3 mm or more in both the first fiber direction (for example, the longitudinal direction) and the second fiber direction (for example, the lateral direction), and more preferably 0.4 mm or more. .. Further, the mesh in the cloth-type nonwoven fabric is preferably, for example, 3 mm or less in both the first fiber direction (for example, the longitudinal direction) and the second fiber direction (for example, the lateral direction), and particularly preferably 2 mm or less. Here, the mesh means the width of the space between adjacent fibers in the first fiber direction or the second fiber direction of the mesh. When the mesh in the cloth-type nonwoven fabric has the above lower limit, it is possible to suppress an increase in the light blocking rate. Further, when the mesh in the cloth-type nonwoven fabric has the above-mentioned upper limit, it is possible to suppress the decrease in the strength of the cloth-type nonwoven fabric.

The cloth-type nonwoven fabric can be manufactured by using, for example, a monofilament or a flat yarn. The cloth-type nonwoven fabric obtained by using the monofilament has high strength and good air permeability, and the cloth-type nonwoven fabric obtained by using the flat yarn is easy to form a cloth having a smooth surface and has good coverage. In addition, the cloth-type nonwoven fabric can be preferably obtained by heat-bonding a core-sheath composite monofilament or a multilayer composite flat yarn. The cross-type nonwoven fabric obtained by using the core-sheath composite monofilament or the multi-layer composite flat yarn is, for example, a relatively low-temperature polyolefin whose surface is coated, is softened and melted by heating, and is cross-bonded to each other at the cross-bonded portion of the warp and weft yarns. It is obtained by heat fusion. By such a sealing process, it is possible to prevent the misalignment with durability.

The core-sheath composite monofilament preferably has a structure in which a high melting point polyolefin having a relatively high melting point is used as a core layer and a polyolefin having a lower melting point is coated on the surface of the core layer to form a sheath layer. As the core/sheath combination of the core-sheath composite monofilament, propylene homopolymer/propylene-ethylene block copolymer, propylene homopolymer/propylene-ethylene random copolymer, propylene homopolymer/high density polyethylene, propylene homopolymer Polymer/low-density polyethylene, propylene homopolymer layer/linear low-density polyethylene, propylene-ethylene block copolymer/linear low-density polyethylene, propylene-ethylene random copolymer/low-density polyethylene, high-density polyethylene/ Examples thereof include low density polyethylene and high density polyethylene/linear low density polyethylene. A more preferable combination of core layer/sheath layer is, for example, a combination of high-density polyethylene/low-density polyethylene and high-density polyethylene/linear low-density polyethylene from the viewpoints of heat-sealing property, strength, recycling and the like. Be done.

The core-sheath composite monofilament is, for example, melt-kneaded with a polyolefin-based resin of each layer of the core layer and the sheath layer by an extruder, and for example, while supplying a core layer made of a high-melting point polyolefin at a melting temperature of 160° C. or higher and 300° C. or lower, It can be produced by coating the outer surface with a sheath layer made of a low-melting point polyolefin, cooling and solidifying the product, stretching the product, and then performing a relaxation heat treatment. The draw ratio may be, for example, 3 times or more and 12 times or less, and preferably 5 times or more and 10 times or less.

The core-sheath composite monofilament preferably has a fineness of, for example, 30 dt or more, and more preferably 50 dt or more. The fineness of the core-sheath composite monofilament is preferably 3000 dt or less, and more preferably 2000 dt or less. When the fineness of the core-sheath composite monofilament has the above lower limit, it is possible to suppress the occurrence of the problem that the fibers become too thin and the durability decreases. Further, it is possible to suppress deterioration of mechanical properties such as tear strength of the reinforcing sheet. On the other hand, when the fineness of the core-sheath composite monofilament has the above upper limit, good weaving becomes possible. Also, good flexibility is obtained, and sufficient adhesion with the adhesive layer is possible.

The sectional area ratio (sheath layer/core layer) of the sheath layer and the core layer of the core-sheath composite filament is, for example, preferably 1/9 or more, and more preferably 2/8 or more. The cross-sectional area ratio (sheath layer/core layer) between the sheath layer and the core layer of the core-sheath composite filament is preferably 6/4 or less, and more preferably 5/5 or less. When the cross-sectional area ratio of the sheath layer to the core layer of the core-sheath composite filament has the above lower limit, the sheath component can cover the entire cross section of the core layer, and the decrease in adhesive strength can be suppressed. On the other hand, when the cross-sectional area ratio between the sheath layer and the core layer of the core-sheath composite filament has the above upper limit, it is possible to suppress the decrease in the tensile strength of the filament yarn.

The multilayer composite flat yarn preferably has a multilayer structure in which a high melting point polyolefin is used as an inner base layer and a low melting point polyolefin having a lower melting point is sandwiched between outer surface layers. Examples of the combination of the multi-layer composite flat yarn include a low density polyethylene layer/high density polyethylene layer/low density polyethylene layer composite, and a linear low density polyethylene layer/high density polyethylene layer/linear low density polyethylene layer. Examples thereof include a composite and a combination of a propylene-ethylene random copolymer layer/a polypropylene homopolymer layer/a propylene-ethylene random copolymer layer composite. As a more preferable combination of the multilayer composite flat yarn, from the viewpoint of recycling, a composite of a low density polyethylene layer/a high density polyethylene layer/a low density polyethylene layer, a linear low density polyethylene layer/a high density polyethylene layer/a straight chain Examples thereof include a composite of a low density polyethylene layer.

The multilayer composite flat yarn is, for example, a base material made of a high-melting polyolefin at a melting temperature of, for example, 160° C. or higher and 300° C. or lower by melt-kneading the polyolefin-based resin of each layer of the inner base layer and the outer surface layer with an extruder. It can be manufactured by supplying a layer, coating the surface layer made of low melting point polyolefin on both upper and lower surfaces of the base material layer, cooling and solidifying, then slitting, further stretching treatment, and then performing relaxation heat treatment. .. The stretching ratio is preferably, for example, 3 times or more and 12 times or less.

The fineness of the multilayer composite flat yarn is, for example, preferably 100 dt or more, and more preferably 200 dt or more. The fineness of the multilayer composite flat yarn is preferably 4000 dt or less, and more preferably 3000 dt or less. When the fineness of the multilayer composite flat yarn has the above lower limit, it is possible to suppress the occurrence of the problem that the fiber becomes too thin and the durability decreases. On the other hand, when the fineness of the multilayer composite flat yarn has the above upper limit, good weaving becomes possible.

The cross-sectional area ratio (surface layer/base material layer) of the surface layer and the base material layer of the multilayer composite flat yarn is, for example, preferably 1/9 or more, and more preferably 2/8 or more. The cross-sectional area ratio between the surface layer and the base material layer of the multilayer composite flat yarn is, for example, preferably 6/4 or less, and more preferably 5/5 or less. When the cross-sectional area ratio between the surface layer and the base material layer of the multilayer composite flat yarn has the above lower limit, the surface layer can sufficiently cover the base material layer, and the decrease in adhesive strength can be suppressed. it can. On the other hand, when the cross-sectional area ratio between the surface layer and the base material layer of the multilayer composite flat yarn has the above upper limit, it is possible to suppress the decrease in the tensile strength of the filament yarn. Here, the cross-sectional area of the surface layer in the above cross-sectional area ratio is the sum of the cross-sectional areas of the surface layers on both sides.

The reinforcing sheet preferably contains a resin. The resin may be a thermoplastic resin or a thermosetting resin, but the former is preferable. Examples of the thermoplastic resin include a polyolefin resin, an acrylic resin, a styrene resin, a vinyl fluoride resin, an amide resin, and a saturated ester resin. Among them, the polyolefin resin is preferable. In the present disclosure, the reinforcing sheet is preferably a fiber orthogonal nonwoven fabric containing a polyolefin resin. This is because it has excellent heat resistance, water resistance, chemical resistance, and cost.

Specific examples of the polyolefin-based resin include, for example, polyethylene-based resin, polypropylene-based resin and the like, and among them, the polyethylene-based resin is preferable. Examples of the polyolefin resin include the polyolefin resins described in the above “(1) Base material sheet”.

As described above, acrylic resin, styrene resin, vinyl fluoride resin, amide resin, ester resin or the like can be used as the thermoplastic resin. Examples of the acrylic resin include polymethyl acrylate, polymethyl methacrylate, ethylene-ethyl acrylate copolymer and the like. Examples of the styrene resin include butadiene-styrene copolymer, acrylonitrile-styrene copolymer, polystyrene, styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-acrylic acid copolymer and the like. Is mentioned. Examples of the vinyl fluoride resin include vinyl chloride resin, polyvinyl fluoride, polyvinylidene fluoride and the like. Examples of the amide-based resin include 6-nylon, 6,6-nylon, 12-nylon and the like. Examples of the ester-based resin include polyethylene terephthalate and polyprebutylene terephthalate. Further, as the thermoplastic resin, polycarbonate, polyphenylene oxide, polyacetal, polyphenylene sulfide, silicone resin, thermoplastic urethane resin, polyether ether ketone, polyether imide, thermoplastic elastomer or the like may be used.

Further, it is preferable that both the reinforcing sheet and the base sheet contain a polyethylene resin. This is because, for example, when an adhesive layer described below is provided, the polyethylene-based resin has the same adhesiveness to the adhesive, so that a strongly adhered reflective sheet can be obtained. Also, since the degree of expansion and contraction due to heat, moisture, etc. is close, warpage is less likely to occur, and adhesion is less likely to peel off. As a result, the reflective sheet has high durability. Further, by using the polyethylene resin, the reflection sheet having high water resistance can be obtained. Further, when both the reinforcing sheet and the base sheet contain a polyethylene resin, the reflective sheet becomes recyclable, and the environmental load at the time of disposal is small. In particular, it is preferable that all layers of the reflection sheet contain a polyethylene resin.

Further, it is preferable that the reinforcing sheet contains a polypropylene resin and the base sheet contains a polyethylene resin. This is because the workability of the reflection sheet is improved. Specifically, polypropylene-based resin is a relatively hard resin and therefore difficult to process. On the other hand, since the polyethylene resin is a relatively soft resin, the workability of the reflection sheet is improved by combining the polyethylene resin.

The reinforcing sheet may have a single-layer structure or a multi-layer structure. Examples of the reflection sheet having a single-layer structure reinforcing sheet include a reflection sheet having a base sheet, an adhesive layer, and a single-layer structure reinforcing sheet in this order.

On the other hand, examples of the reflection sheet having a reinforcing sheet having a multilayer structure include a reflecting sheet having a base sheet, an adhesive layer, and a reinforcing sheet having a multilayer structure in this order. The reinforcing sheet having a multilayer structure preferably has a first reinforcing sheet layer, a reinforcing sheet adhesive layer, and a second reinforcing sheet layer in this order. In addition, the plurality of reinforcing sheet layers may be in contact (for example, fused) without an adhesive layer. Further, the type of the adhesive layer for the reinforcing sheet is not particularly limited.

The reinforcing sheet may be a porous reinforcing sheet. When the reinforcing sheet has a multi-layer structure, at least one layer constituting the reinforcing sheet may be a porous reinforcing layer.

The thickness of the reinforcing sheet is not particularly limited, but is, for example, 10 μm or more and 150 μm or less, and preferably 20 μm or more and 100 μm or less. When the reinforcing sheet has a multi-layer structure, the thickness of each layer forming the reinforcing sheet is preferably within the above range. Further, the reflection sheet may have the reinforcing sheet on the outermost surface or may have the reinforcing sheet inside.

(3) Adhesive Layer When the reflective sheet has a reinforcing sheet on one surface side of the base sheet, the reflective sheet may have an adhesive layer between the base sheet and the reinforcing sheet, and does not have an adhesive layer. You don't have to. In the latter case, it is preferable that the base sheet and the reinforcing sheet are in direct contact with each other. The adhesive layer preferably contains a resin such as a polyolefin resin. Such an adhesive layer can be obtained by, for example, extrusion coating a resin.

In extrusion coating, resins that can be melted by heat and fused to each other can be used. Examples of such resins include polyethylene resins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene resins such as polypropylene, and ethylene-vinyl acetate copolymer. Coal, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, Acid-modified polyolefin resin obtained by modifying polyolefin resin such as polybutene polymer, polyethylene or polypropylene with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid or itaconic acid, polyvinyl acetate resin , Poly(meth)acrylic resin, and polyvinyl chloride resin can be used.

These may be used alone or in combination of two or more. Among these, polyethylene resins are suitable, low density polyethylene and linear low density polyethylene are preferable, and low density polyethylene is more preferable. Low-density polyethylene is excellent in processability, has excellent adhesiveness to a polyethylene non-woven fabric, and is inexpensive.

The polyethylene resin preferably has a melt flow rate (temperature 230° C., load 2.16 kg) measured according to JIS K 7210 of 0.1 g/10 min or more and 4.0 g/10 min or less, and 0. More preferably, it is not less than 0.4 g/10 min and not more than 2.0 g/10 min. A melt flow rate (MFR) within the above range is particularly suitable for extrusion coating.

Further, in order to enhance the adhesiveness between the base sheet and the reinforcing sheet, for example, an anchor coating agent may be coated on the base sheet to provide an anchor coating layer. Examples of the anchor coating agent that forms the anchor coating agent layer include organic titanium-based anchor coating agents such as alkyl titanates, isocyanate-based anchor coating agents, polyethyleneimine-based anchor coating agents, and polybutadiene-based anchor coating agents. In the present disclosure, similarly to the above, the anchor coating agent is coated by, for example, roll coating, gravure coating, knife coating, dip coating, spray coating, or other coating method, and drying the solvent, the diluent, etc. An anchor coat agent layer can be formed. In the above, the application amount of the anchor coating agent is preferably 0.1 g/m ² or more and 5 g/m ² or less (dry state).

In the present disclosure, as an adhesive for laminating to form an anchor coating agent, for example, an aromatic polyisocyanate such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, or hexamethylene diisocyanate. , Polyfunctional isocyanates such as aliphatic polyisocyanates such as xylylene diisocyanate, and polyether polyurethane-based resins and polyesters obtained by the reaction of hydroxyl group-containing compounds such as polyether-based polyols, polyester-based polyols and polyacrylate polyols It is preferable to use a laminating adhesive containing a polyurethane polyurethane resin or a polyacrylate polyurethane resin as a main component.

The anchor coat agent layer can form a thin film that is soft, highly flexible, and highly flexible, and can improve its tensile elongation. Further, it acts as a coating film having flexibility, flexibility, etc. on the base material sheet to improve the suitability for processing the base material sheet at the time of laminating and prevent peeling defects during use.

The anchor coating agent layer in the present disclosure preferably has a tensile elongation of 100% or more and 300% or less based on JIS K7113. The tensile elongation of the anchor coat agent layer can improve the tight adhesion between the base sheet and the reinforcing sheet. Therefore, the laminating strength and the like of the base sheet and the reinforcing sheet can be increased.

On the other hand, the adhesive layer in the present disclosure may be a layer containing an adhesive. Such an adhesive layer can be obtained, for example, by applying an adhesive composition containing an adhesive. The type of adhesive is not particularly limited, and examples thereof include polyether adhesives, polyester adhesives, polyurethane adhesives, vinyl adhesives, (meth)acrylic adhesives, polyamide adhesives, epoxy adhesives. Agents, rubber-based adhesives, and the like. The adhesive may be a one-component curing type or a two-component curing type.

(4) Reflective Sheet The reflective sheet may or may not have a light reflecting layer. When the light reflecting layer is provided, the visible light reflectance can be further increased. The light reflecting layer contains, for example, a white powder and a resin component. Examples of the white powder include anatase type or rutile type titanium oxide, titanium oxide whose surface is treated with a metal oxide such as Al and Si, calcium carbonate, barium sulfate and the like. Examples of the resin component include polyurethane resin and polyester resin. Examples of polyurethane resins include polyester polyurethane, polyether polyurethane, polyether polyester polyurethane, polycarbonate polyurethane, and polycaprolactam polyurethane. The location of the light reflecting layer is not particularly limited, and may be the outermost surface or the inside of the reflecting sheet. Moreover, it is preferable that the light reflection layer is provided on the opposite side of the reinforcing sheet with respect to the base sheet. The thickness of the light reflecting layer is, for example, 0.5 μm or more and 4 μm or less.

The reflective sheet preferably has a high visible light reflectance. The average reflectance of visible light (wavelength 380 nm or more and 780 nm or less) is, for example, 70% or more, preferably 80% or more, and more preferably 90% or more. The total reflectance of the reflection sheet at a wavelength of 600 nm is, for example, 70% or more, 80% or more, or 90% or more.

The thickness of the reflection sheet is not particularly limited, but is, for example, 50 μm or more and 300 μm or less, and preferably 80 μm or more and 250 μm or less. The moisture permeability of the reflection sheet may be, for example, 10 g/m ² ·day or more, and may be 20 g/m ² ·day or more.

3. Cultivation rack The cultivation rack in the present disclosure provides a first member on which a cultivation tank can be placed, a second member provided with a space for the first member, and a space for the first member. And a plurality of pillar members for fixing the positions of the first member and the second member, and a lighting member arranged on the first member side with respect to the second member. .. In addition, "the cultivation tank can be mounted" means that the first member can be mounted directly or through another member. Further, the first member does not necessarily have to be able to mount the cultivation tank alone. For example, the cultivation tank may be connected to a pillar member or the like, and the weight of the cultivation tank may be dispersed by the above connection so that the first member can be placed on the cultivation tank.

(1) First member, second member and pillar member The skeleton of the cultivation rack is formed by the first member, the second member and the plurality of pillar members. The materials of the first member, the second member, and the plurality of pillar members are not particularly limited, but examples thereof include metals such as stainless steel, iron, and aluminum. The first member and the second member may have a plate shape or a mesh shape, for example. Further, the plan-view shapes of the first member and the second member are not particularly limited, and examples thereof include a square and a rectangle. Examples of the cross-sectional shape of the pillar member include a circle, a square, and a rectangle. The number of the pillar members is preferably such that the first member and the second member can be stably fixed, and is, for example, 3 or more, 4 or more, or 8 or more. It is preferable that the first member and the second member are connected to the pillar member using a known connecting tool.

The shape of the cultivation tank placed on the first member is not particularly limited, and examples thereof include a pot shape, a bag shape, and a bed shape. Further, hydroponics (submerged hydroponics, NFT hydroponics) may be performed using a cultivation tank, or soil culture may be performed. Alternatively, a rock wool mat may be laid on the first member, and a rock wool pot may be placed on the mat to perform rock wool cultivation. Further, instead of rock wool, coco bag cultivation may be performed using coco peat, which is easy to dispose after use, as a medium.

(2) Illumination member The illumination member is arranged with a space provided with respect to the first member, and is arranged closer to the first member than the second member. The lighting member may be directly arranged on the surface of the second member, or may be arranged with a space provided for the second member via another member. Further, the lighting member may also have the function of the second member. In that case, the illumination member is arranged with a space provided with respect to the first member.

The lighting member has at least a light source. Examples of the light source include an LED and a fluorescent lamp, and among them, an LED is preferable. This is because the power consumption is low. The color of the light source is not particularly limited and is appropriately selected according to the plant to be cultivated. Further, it is preferable that the light source is arranged on the substrate directly or via another layer. A refrigerant pipe may be connected to the base body. This is because the heat generated from the light source can be removed. Examples of the material of the base include aluminum and copper. Examples of the refrigerant include ammonia and water.

Further, a reflector may be arranged between the light source and the base. This is because even if the light emitted from the light source is reflected by the surface of the culture medium in the cultivation tank and returns to the light source, the reflected light can be emitted to the plant again by providing the reflection plate.

Further, the number of light sources may be changed according to the growth of plants. This is because the amount of light required for plants differs depending on the growth stage. That is, it is preferable to reduce the amount of light in a plant that has a thick leaf and is close to the harvest time, in a case where the plant has a large amount of light, and a plant that has just emerged and has small leaves still has a small amount of light. By setting an appropriate amount of light in this way, the number of light sources can be reduced as a result, and the facility cost and the running cost can be reduced.

(3) Cultivation Rack The cultivation rack has a structure having a first member, a second member, a lighting member, and a plurality of pillar members. The cultivation rack may have one structure or a plurality of the structures. For example, the cultivation rack 10 in FIGS. 1 and 2 has a structure in which the structures 16 are stacked in four stages. When the cultivation rack has a plurality of structures, the second member may also have the function of the first member. For example, in FIG. 2, the second member 13 of the second structure 16 from the top has the lighting member 14 arranged on one surface side and the cultivation tank 11 placed on the other surface side. That is, the second member 13 also has the function of the first member 12.

The cultivation rack may be a fixed type or a movable type. Further, the cultivation rack may be a hanging type.

4. Plant cultivation device A plant cultivation device in the present disclosure includes at least the above-described cultivation rack and reflection sheet. The plant cultivation device may have a culture solution supply device that supplies the culture solution to the cultivation tank. As the culture solution supply device, for example, a storage section that stores the culture solution, a pipe section and a pump section that circulate the culture solution in the storage section, and a culture solution that is connected to each cultivation tank and supplies the culture solution in the piping section to the cultivation tank A device having a supply unit for In addition, the plant cultivation device further includes at least one of a CO ₂ supply device, a blower, an air purifier, a dehumidifier, a humidifier, a heater, and a cooler for increasing the CO ₂ concentration in the cultivation rack, if necessary. May be.

The use of the plant cultivation device is not particularly limited, but it is preferably used for artificial light type cultivation that does not use sunlight. Moreover, you may use a plant cultivation apparatus as a seedling raising apparatus. The plant cultivated by the plant cultivating device may be a long-day plant (a plant that responds to long days to regulate flower bud formation) or a short-day plant (a plant that responds to short days to regulate flower bud formation). It may be a neutral plant (a plant that does not react to the photoperiod). Specific examples include leaf vegetables, fruit vegetables, flowers and the like. Examples of the leaf vegetables include lettuce, bok choy, arugula, coriander, basil, celery, kale, perilla, ice plant, saffron, and the like. Examples of the fruit and vegetables include tomato, okra, squash, cucumber and the like.

B. Reflective sheet The reflective sheet in the present disclosure is used to be arranged on the side surface of the cultivation rack, is a reflective sheet having visible light reflectivity, and has a fixture for fixing the reflective sheet to the cultivation rack. The fixture has a sandwiching structure that is attachable to and detachable from the cultivation rack and that fixes the reflective sheet by sandwiching it.

According to the present disclosure, by using a specific fixture, the reflection sheet can be easily arranged on the side surface of the cultivation rack without processing the reflection sheet. The reflection sheet may be arranged on the side surface in the longitudinal direction of the cultivation rack or may be arranged on the side surface in the lateral direction of the cultivation rack, but the former is preferable. Further, the reflection sheet according to the present disclosure has a fixture. These details can be the same as those described in the above “A. Plant cultivating device”, and thus the description thereof is omitted here.

Note that the present disclosure is not limited to the above embodiment. The above-described embodiment is an exemplification, has substantially the same configuration as the technical idea described in the claims of the present disclosure, and has any similar effects to the present invention. It is included in the technical scope in the disclosure.

[Example 1]
(Preparation of base material sheet)
100 parts by mass of linear low-density polyethylene (L-LDPE, melting point 125° C., MFR (190° C., 2160 g): 2.0 g/10 min) as a polyethylene resin, and 2(2′-hydroxy-5′) as an ultraviolet absorber. 0.1 parts by mass of -tert-octylphenyl)benzotriazole, NOR-type hindered amine light stabilizer (Adeka Stab LA-81 manufactured by ADEKA CORPORATION) (bis(1-undecaneoxy-2,2,6,6-tetramethylpiperidine) -4-yl)carbonate) 0.4 part by mass, as a phenolic antioxidant, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propinate] 0.1 part by mass, 20 parts by mass of calcium carbonate as an inorganic filler 1 (heavy calcium carbonate (PE masterbatch with a filling rate of 60%): PE content 8 parts by mass), 40 parts by mass of a titanium pigment as an inorganic filler 2 (filling ratio of 80%) PE masterbatch (content of PE: 8 parts by mass) was mixed and melt-kneaded at 180° C. using a Banbury mixer.

The total amount of the polyethylene-based resin contained in the obtained kneaded product was 116 parts by mass, and the content of the NOR-type hindered amine-based light stabilizer was 0.34% by mass with respect to the polyethylene-based resin. Further, the content of the inorganic fillers 1 and 2 is 51.7% by mass based on the polyethylene resin.

Next, the obtained kneaded product is supplied to a 12-inch diameter×30-liter common head type mixing roll (rotation speed: 18 rpm) and rolled at a roll temperature of 165° C. or higher and 190° C. or lower to obtain a base sheet having a thickness of 60 μm. (Polyethylene sheet) was obtained.

(Production of reflective sheet)
A base sheet and a reinforcing sheet were prepared. A polyethylene cloth made of polyethylene resin is prepared as a reinforcing sheet, and then a urethane-based anchor coating agent is coated on the base material sheet to form an anchor coating agent layer having a thickness of 0.5 g/m ² (dry state). Formed. Further, low density polyethylene (LDPE, MI=8.0, density=0.92) was melt-extruded (extrusion coating) with a thickness of 15 μm on the above anchor coat agent layer while performing ozone treatment, A reflection sheet was produced by bonding the reinforcing sheet. The molten resin temperature of LDPE was 320°C.

The obtained reflection sheet was subjected to visible light reflectance measurement, smoothness evaluation, and antifouling evaluation. In the visible light reflectance measurement, using an ultraviolet/visible/near-infrared spectrophotometer (Shimadzu UV-3600) and an integrating sphere accessory (ISR-3100), the incident angle was 8° and the visible region was 380 nm or more and 780 nm or less. The reflectance (total reflectance) was measured, and the average reflectance was calculated. As a standard plate, Spectralon (made by Teflon (registered trademark)) manufactured by Lovesphere, Inc. in the United States was used. The measurement surface was the surface of the base sheet of the reflection sheet. As a result, the visible light reflectance was 94%. Further, in the evaluation of antifouling property, the pollution grade was evaluated based on JIS-L-1919. As a result, the pollution grade was 3.0.

(Installing the fixing tool)
A fixture (a fixture having a magnet as a detachable portion) as shown in FIG. 5 was attached to the obtained reflection sheet. Then, the magnet of the fixture was attached to the second member of the cultivation rack to arrange the reflection sheet on the side surface in the longitudinal direction of the cultivation rack. As described above, by using the fixture, the reflection sheet could be easily arranged on the side surface of the cultivation rack without processing the reflection sheet.

[Example 2]
The obtained reflection sheet was fitted with a fixture (a fixture having a through hole as a detachable portion) as shown in FIG. Then, the through hole of the fixture was hooked on the hook attached to the second member of the cultivation rack to arrange the reflection sheet on the side surface in the longitudinal direction of the cultivation rack. As described above, by using the fixture, the reflection sheet could be easily arranged on the side surface of the cultivation rack without processing the reflection sheet.

[Example 3]
A fixture as shown in FIG. 11 (a fixture having a ring as an attaching/detaching part) was attached to the obtained reflection sheet. After that, the ring of the fixture was hooked on the hook attached to the second member of the cultivation rack to arrange the reflection sheet on the side surface in the longitudinal direction of the cultivation rack. As described above, by using the fixture, the reflection sheet could be easily arranged on the side surface of the cultivation rack without processing the reflection sheet.

10... Cultivation rack 11... Cultivation tank 12... First member 13... Second member 14... Lighting member 15... Column member 16... Structure 17... Hook 20... Reflective sheet 21... Base material sheet 22... Reinforcement sheet 30... Fixing tool 31... Substrate 32... Movable plate 33... Side cover 34... Attaching/detaching part 100... Plant cultivation device

Claims (4)

A first member on which a cultivation tank can be placed, a second member provided with a space provided for the first member, a second member provided with a space provided for the first member, and the second member A lighting member arranged on the side of the first member rather than a member, and a cultivation rack having a structure having a plurality of pillar members for fixing the positions of the first member and the second member,
Arranged on the side surface in the longitudinal direction of the cultivation rack, a reflective sheet having visible light reflectivity,
A fixture for fixing the reflection sheet to the cultivation rack,
Equipped with
The plant cultivation device, wherein the fixture is detachable from the cultivation rack, and has a sandwiching structure for sandwiching and fixing the reflection sheet. The plant cultivation device according to claim 1, wherein the fixture has a banner shape. The plant cultivating apparatus according to claim 1 or 2, wherein the fixture has a magnet, a hook-and-loop fastener, a through hole, or a ring as an attachment/detachment portion that enables attachment/detachment to/from the culture rack. A reflective sheet used to be placed on the side surface of a cultivation rack and having visible light reflectivity,
A fixture for fixing the reflection sheet to the cultivation rack,
A reflection sheet in which the fixture is detachable from the cultivation rack, and has a sandwiching structure for fixing the reflection sheet by sandwiching it.