JP2018186734A - Plant cultivation device and reflection sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant cultivation device that can suppress reduction of work efficiency caused by reflection sheet in performing maintenance or the like of plants being cultivated while efficiently irradiating plants with artificial light for example.SOLUTION: A plant cultivation device comprises: a first member capable of mounting cultivation vessels thereon; a second member which is arranged with a space for the first member; illumination members which are arranged with a space for the first member, and arranged on the first member rather than the second member; a cultivation rack 10 which has a structure having a plurality of columnar members which fix the positions of the first member and the second member; and reflection sheet 20 which is arranged at least on a side face of the cultivation rack in a longer direction, and has visible light reflectivity, in which the reflection sheet comprises fixing parts capable of setting the reflection sheet into a folded state along a horizontal direction with respect to the cultivation rack on a surface on the opposite side of a surface facing the cultivation rack.SELECTED DRAWING: Figure 3

Description

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

  As a method for cultivating plants such as vegetables, for example, artificial light type cultivation using artificial light such as LEDs is known. As a plant cultivation apparatus used for artificial light type cultivation, for example, in Patent Document 1, a cultivation rack having a plurality of support columns and a placement unit on which a cultivation tank provided with plants and planted using the support columns is placed; An illuminating device disposed on the cultivation rack with an interval above the mounting portion, and the illuminating device is attached to the cultivation rack so that the height position of the illuminating device with respect to the mounting portion can be changed. Is a plant cultivation device including a frame-like frame and a plurality of straight tubular LED lamps detachably attached to the frame, and a pair of frame members facing each other in the frame of the lighting device are specified A plant cultivation apparatus having a lamp receiving part is disclosed. An object of this technology is to provide a plant cultivation apparatus in which the operation of attaching and detaching the LED lamp to the frame of the lighting apparatus becomes relatively simple and the number of parts can be reduced.

  Moreover, in patent document 2, in the plant cultivation apparatus provided with the cultivation rack which has the mounting shelf which mounts the cultivation tank in which the plant was planted, and the LED lighting apparatus arrange | positioned at intervals above the mounting shelf. A plant cultivation device is disclosed in which a support portion for supporting the LED lighting device is provided on the cultivation rack so that the height position of the LED lighting device relative to the mounting shelf can be changed. This technique makes it a subject to provide the plant cultivation apparatus which can adjust the light intensity irradiated to a plant.

Japanese Patent Laid-Open No. 2015-8126 JP 2013-17397 A

  For example, by arranging a reflection sheet on the side surface of the cultivation rack, artificial light such as LED can be efficiently irradiated to the plant. However, when a reflective sheet is disposed on the side surface of the cultivation rack, the efficiency of work is reduced by the reflective sheet when the plant being grown is cared for.

  The present disclosure has been made in view of the above circumstances, and can efficiently suppress a decrease in work efficiency due to a reflective sheet when, for example, caring for a plant being cultivated while efficiently irradiating a plant with artificial light. The main purpose is to provide a plant cultivation device.

  In the present disclosure, the first member on which the cultivation tank can be placed, the second member disposed with a space for the first member, and the space for the first member are disposed, And the cultivation rack which has a structure which has a lighting member arranged on the 1st member side rather than the 2nd member, and a plurality of pillar members which fix the position of the 1st member and the 2nd member, A reflection sheet that is disposed on at least a side surface in the longitudinal direction of the cultivation rack and has visible light reflectivity, and the reflection sheet is disposed on a surface opposite to a surface facing the cultivation rack. Provided is a plant cultivation apparatus provided with a fixing part that can be folded along the horizontal direction with respect to the cultivation rack.

  Moreover, in this indication, the 2nd member arrange | positioned by providing a space with respect to the said 1st member which can mount a cultivation tank, and the space provided with respect to the said 1st member And the cultivation rack which has a unit structure which has a plurality of pillar members which fix the position of the lighting member arranged to the 1st member side rather than the 2nd member, and the 1st member and the 2nd member. It is a reflective sheet arrange | positioned at least on the side surface of a longitudinal direction, Comprising: The reflective sheet provided with a fixing | fixed part in the surface on the opposite side to the surface facing the said cultivation rack is provided.

  The plant cultivation apparatus according to the present disclosure has an effect that, for example, when a plant under cultivation is cared for while artificially irradiating artificial light, a reduction in work efficiency due to the reflective sheet can be suppressed.

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 of this indication. It is the enlarged view to which the area | region R of FIG. 3 was expanded. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the 2nd fixing | fixed part in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication. It is explanatory drawing for demonstrating the penetration part in this indication. It is explanatory drawing for demonstrating the reflective sheet in this indication.

  Hereinafter, the plant cultivation apparatus and the reflection sheet of the present disclosure will be described in detail.

A. Plant cultivation device The plant cultivation device of this indication is explained using a figure. FIG. 1 is a schematic front view showing an example of a cultivation rack, and FIG. 2 is a schematic side view of FIG. FIG. 3 is a schematic perspective view showing an example of the plant cultivation apparatus, and FIG. 4 is an enlarged view of an area indicated by a symbol R in FIG.

  As shown in FIG. 1 and FIG. 2, the cultivation rack 10 includes a first member 12 on which the cultivation tank 11 can be placed, a second member 13 disposed with a space with respect to the first member 12, and a first A plurality of lighting members 14 arranged with a space with respect to one member 12 and arranged closer to the first member side 12 than the second member 13, and a plurality of positions for fixing the positions of the first member 12 and the second member 13. The structure body 16 having the column member 15 is provided. 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 illustrated, the cultivation rack 10 may be provided with a culture solution supply device that supplies the culture solution to the cultivation tank 11. As shown in FIGS. 3 and 4, the plant cultivation device 100 is disposed on the side surface of the cultivation rack 10 and at least the longitudinal direction LD of the cultivation rack 10, has visible light reflectivity, and faces the cultivation rack 10. The reflection sheet 20 is provided on the surface opposite to the surface on which the reflection sheet 20 is provided. The reflection sheet 20 includes a fixing portion 21 that can be folded in the horizontal direction with respect to the cultivation rack 10.

According to the present disclosure, since the reflection sheet disposed on the side surface of the cultivation rack has a fixing portion, while irradiating the plant with artificial light efficiently, for example, when performing maintenance of the plant during cultivation, It can be set as the plant cultivation apparatus which can suppress the fall of the working efficiency by a reflective sheet. Specifically, the plant cultivation apparatus according to the present disclosure includes the fixing unit 21, so that the reflection sheet 20 is arranged in the horizontal direction with respect to the cultivation rack 10 as illustrated in FIGS. Can be temporarily fixed in the state of being folded in the direction of the arrow. Therefore, when performing the maintenance of the plant being cultivated, it is possible to suppress a reduction in work efficiency due to the reflection sheet 20 being disposed on the side surface. In addition, since the reflection sheet can be partially folded, it is not necessary to remove the reflection sheet when performing maintenance or the like of the plant being cultivated, and the plant can be continuously and efficiently irradiated with artificial light.
Moreover, according to this indication, a plant can be efficiently irradiated to artificial light, such as LED, by arrange | positioning a reflective sheet to the side surface of a cultivation rack, for example. In particular, by using a reflective sheet having good irregular reflection, artificial light can be efficiently irradiated to a plant. Thereby, the number of the light sources of an illuminating device can be reduced, As a result, reduction of installation cost and reduction of running cost can be aimed at.

1. Reflective sheet The reflective sheet in this indication is arranged on the side of the cultivation rack at least in the longitudinal direction. “At least the side surface in the longitudinal direction of the cultivation rack” refers to a surface specified by the first member, the second member, and the column member, and parallel to the direction indicated by the arrow LD in FIG. 3, for example. Here, “the surface specified by the first member, the second member, and the column member” means that, for example, when the shape of the cultivation rack is a cube, the top surface and the bottom surface are excluded from the six surfaces. Four sides correspond to the side of the cultivation rack. Moreover, the “side surface in the longitudinal direction of the cultivation rack” refers to a side surface parallel to the longitudinal direction of the first member and the second member.

  The reflection sheet in the present disclosure may be disposed on at least the side surface in the longitudinal direction of the cultivation rack. For example, as illustrated in FIG. 3, the reflection sheet may be disposed on two surfaces in the longitudinal direction of the cultivation rack 10. Although not shown, it may be arranged on any one of the side surfaces in the longitudinal direction of the cultivation rack. Moreover, the reflective sheet in this indication may be arrange | positioned at the side surface of the transversal direction of the cultivation rack other than the side surface of the cultivation rack in the longitudinal direction. Therefore, in the present disclosure, the reflection sheet may be disposed on one surface including the longitudinal side surface of the cultivation rack, may be disposed on two surfaces, may be disposed on three surfaces, and further It may be arranged on four sides. Especially, it is preferable that a reflective sheet is arrange | positioned on two surfaces which the side surface of the longitudinal direction of a cultivation rack opposes. Moreover, it is preferable that a reflective sheet is arrange | positioned on all the four surfaces of the side surface of a cultivation rack. It is also possible to further increase the reflection efficiency of artificial light such as LEDs by disposing a reflection sheet. Although the shape of a reflection sheet is not specifically limited, For example, a square and a rectangle are mentioned. In particular, the reflective sheet is preferably a rectangular long sheet.

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

Moreover, a reflection sheet equips the surface on the opposite side to the surface facing a cultivation rack with a fixing | fixed part. Here, the “fixing portion” refers to a member for temporarily folding and fixing the reflection sheet 20, such as a member denoted by reference numeral 21 shown in FIGS.
Hereinafter, the fixing part in the reflection sheet will be described.

(1) Fixed part The fixed part in this indication is a member arrange | positioned at the surface on the opposite side to the surface facing a cultivation rack of a reflective sheet. Moreover, the fixing | fixed part in this indication is a member which can be made into the state which folded the reflection sheet along the horizontal direction with respect to the cultivation rack.

  Here, the “surface of the reflection sheet facing the cultivation rack” refers to a surface of the reflection sheet that faces the cultivation rack when the reflection sheet is arranged on the side surface of the cultivation rack. For example, FIG. ), A surface indicated by reference numeral 20a in (b). Therefore, “the surface of the reflective sheet opposite to the surface facing the cultivation rack” refers to the surface of the reflective sheet that faces away from the cultivation rack when the reflective sheet is disposed on the side surface of the cultivation rack. For example, it refers to the surface indicated by reference numeral 20b in FIG.

Moreover, when "the reflective sheet is folded along the horizontal direction with respect to the cultivation rack", for example, as shown in FIGS. 3 and 6, when the reflective sheet 20 is arranged on the side surface of the cultivation rack 10, In the reflective sheet 20, the state which folded with the straight line parallel to the direction shown with code | symbol LD which becomes a horizontal direction with respect to the cultivation rack 10 is said. That is, for example, the state shown in FIG. In addition, “in the reflection sheet 20, a line parallel to the direction indicated by the symbol LD that is horizontal with respect to the cultivation rack 10” indicates, for example, a dotted line indicated by the symbol P _LD illustrated in FIG. 6. 5B shows an example in which the reflection sheet 20 is folded in half, and a dotted line _PLD in FIG. 6 shows a line that equally divides the region of the reflection sheet 20 in the vertical direction.

In the present disclosure, when the region of the reflection sheet is equally divided in the vertical direction, the region on the first member side of the reflection sheet is the first region, and the region on the second member side of the reflection sheet is the second region, It is preferable to provide a fixing part in the first region. Here, “the area of the reflection sheet is equally divided in the vertical direction” means, for example, as shown in FIG. 6, the reflection rack 20 passes through the center point P in the direction of the column member 15 of the cultivation rack and the cultivation rack. When the straight line P _LD parallel to the longitudinal direction LD is drawn, the reflection sheet 20 is separated from the straight line P _LD . The “center point in the column member direction of the cultivation rack” includes not only a complete center point in the column member direction of the cultivation rack but also a point slightly deviated from the center point.

Further, the “region on the first member side of the reflection sheet”, that is, “first region” means that, for example, as shown in FIG. 6, the reflection sheet 20 is arranged on the side surface of the cultivation rack, A region closer to the first member 12 than the second member 13 when equally divided in the direction. More specifically, a straight line P _LD that passes through the center point P in the direction of the column member 15 of the cultivation rack and is parallel to the longitudinal direction LD of the cultivation rack is drawn with respect to the reflection sheet 20, and the reflection sheet 20 is divided into two regions 20A. , 20B indicates the region 20A located on the first member 12 side. On the other hand, the “region on the second member side of the reflection sheet”, that is, the “second region” means that, for example, as shown in FIG. A region closer to the second member 12 than the first member 13 when equally divided in the direction. More specifically, a straight line P _LD that passes through the center point P in the direction of the column member 15 of the cultivation rack and is parallel to the longitudinal direction LD of the cultivation rack is drawn with respect to the reflection sheet 20, and the reflection sheet 20 is divided into two regions 20A. , 20B indicates the region 20B located on the second member 13 side.

  In the present disclosure, the reason why it is preferable to provide the fixing portion in the first region of the reflection sheet is as follows. When cultivating a plant using a cultivation rack, usually, as shown in FIG. 7, for example, a predetermined distance is provided between the plant cultivated in the cultivation rack and the illumination member 14. If it does so, the plant in cultivation will normally be located in the area | region (area | region enclosed with the dotted line of FIG. 7) by the side of the 1st member 12. Therefore, for example, when performing maintenance of plants being cultivated, it is possible to work sufficiently if the first region 20A of the reflection sheet 20 can be folded in the vertical direction, and at least the first region 20A of the reflection sheet is vertical. In order to fold in the direction, it is preferable to provide the fixing portion 21 in the first region 20A of the reflection sheet 20.

  In the present disclosure, the specific position of the fixing portion disposed in the first region of the reflective sheet is not particularly limited as long as it is within the first region of the reflective sheet, and is appropriately adjusted according to the height at which the reflective sheet is folded. be able to. In the present disclosure, it is preferable that the fixed portion is disposed on the side closer to the first member of the reflective sheet. Even if the fixing portion is a grommet as shown in FIG. 7, for example, the influence on the reflection efficiency due to the grommet hole can be suppressed.

  The fixing portion used in the present disclosure is a member that can temporarily fix a state in which the reflection sheet is partially folded. For example, in addition to the eyelet as shown in FIGS. And magnet sheet. In the present disclosure, one type of fixing portion described above may be used, or a plurality of types may be used simultaneously. In the present disclosure, it is particularly preferable that the fixing portion is an eyelet. By hooking the eyelet on the hook, the state where the reflection sheet is partially folded can be sufficiently fixed. Therefore, it is possible to prevent problems such as falling of the folded reflection sheet.

  Hereinafter, the description will be divided into an aspect in which the fixing part is eyelet (first embodiment), an aspect in which the fixing part is a hook-and-loop fastener (second embodiment), and an aspect in which the fixing part is a magnetic sheet (third embodiment). To do.

(A) 1st embodiment This aspect is an aspect whose fixing | fixed part is eyelet. When the fixing portion is an eyelet, a member for hooking the eyelet is usually required. Hereinafter, the eyelet is referred to as a first fixing portion, and the member for hooking the eyelet is referred to as a second fixing portion.

(I) First fixing portion The eyelet used as the first fixing portion may be, for example, a metal eyelet using a metal such as luminium, brass, or stainless steel, or a resin eyelet using a plastic such as polycarbonate. Also good. In this embodiment, a metal eyelet is preferable. In the case of a metal eyelet, the metal member that becomes the eyelet is punched into the reflection sheet using a punch, so that the metal member is crushed and attached to the reflection sheet. Thus, when it is a metal eyelet, the eyelet can be attached to the reflection sheet by an easy method. Moreover, when it is a metal eyelet, since it attaches to a reflective sheet by crushing the metal member used as an eyelet as mentioned above, it can obtain strong adhesion to the reflective sheet without using an adhesive or the like. Can do.

  The size of the eyelet can be appropriately adjusted according to the size of the hook on which the eyelet is hooked, and can be set to a general size. Therefore, detailed description thereof is omitted here. In this embodiment, it is preferable that the size of the eyelet is relatively small. By providing an eyelet on the reflection sheet, a hole for hooking the eyelet on the hook is formed in an area corresponding to the center of the eyelet of the reflection sheet, and the size of the hole is changed according to the size of the eyelet. The Therefore, by making the size of the eyelet relatively small, the size of the hole formed in the region corresponding to the center of the eyelet of the reflection sheet can also be made relatively small, and the reflection by providing the eyelet on the reflection sheet. The influence on the reflection efficiency of the sheet can be suppressed.

In this aspect, usually, there are a plurality of first fixing portions. As shown in FIG. 3, the plurality of first fixing portions are preferably arranged in parallel with the longitudinal direction LD of the cultivation rack 10. At this time, the distance between the adjacent first fixing parts affects the work efficiency when the reflecting sheet is folded and fixed by the first fixing parts, and the reflecting sheets are slapped between the adjacent first fixing parts. It is preferable that the distance is such that it is not given. The specific distance between the adjacent first fixing portions is, for example, preferably 8 cm or more and 70 cm or less, and particularly preferably 10 cn or more and 50 cm or less. Here, the distance between the first fixing portion adjacent, for example, refers to the distance indicated by a symbol D ₁ of the FIG.

  Since the eyelet attachment method to the reflection sheet can be the same as the general eyelet attachment method, description thereof is omitted here.

(Ii) Second fixing portion When the first fixing portion is an eyelet, a second fixing portion for hooking the eyelet is required. An example of the second fixing portion is a hook. When a hook is provided as the second fixing portion, the hook 23 can be provided on the second member 13 as shown in FIGS. 5A and 5B, for example.

  The hook in the present embodiment is not particularly limited as long as it can hook the eyelet attached to the reflection sheet. For example, the U-shaped hook 23 shown in FIG. 8A or FIG. An S-shaped hook 23 as shown in FIG. FIG. 8B shows an example in which the S-shaped hook 23 is hung on the bar 24 provided on the second member 13. However, the present invention is not limited to this mode. It may be an embodiment in which the is hooked in a hole opened in the second member. In this aspect, for example, as shown in FIG. 8B, the hook is an S-shaped hook 23, and the S-shaped hook 23 is hooked on a bar 24 provided on the second member 13. In this case, although not shown, the reflective sheet can be moved in the longitudinal direction of the cultivation rack.

  In this aspect, normally, it has two or more 2nd fixing | fixed parts. The number of second fixing portions is preferably the same as the number of first fixing portions described above. As shown in FIG. 3, the plurality of second fixing portions are preferably arranged in parallel to the longitudinal direction LD of the cultivation rack 10. In addition, about the distance between adjacent 2nd fixing | fixed part, since it can be made to be the same as that of the content described in the term of the said "(i) 1st fixing | fixed part", description here is abbreviate | omitted.

(Iii) Arrangement of the first fixing part and the second fixing part The arrangement of the first fixing part and the second fixing part in this aspect may be any arrangement that can fix the reflecting sheet in a partially folded state. There is no particular limitation. For example, when the reflection sheet is folded in half along the horizontal direction with respect to the cultivation rack, it is preferable that the first fixing portion and the second fixing portion are arranged at the overlapping positions. This is because the reflection sheet 20 can be folded in the direction of the arrow along the column member 15 of the cultivation rack as shown in FIGS.

  In the present embodiment, “the first fixing portion and the second fixing portion overlap” is not only the case where the first fixing portion and the second fixing portion completely overlap, but also the first fixing portion and the second fixing portion. And the case where at least a part overlaps.

(B) 2nd embodiment This aspect is an aspect whose fixing | fixed part is a hook-and-loop fastener. When the fixing part is a hook-and-loop fastener, it usually has a first fixing part and a second fixing part, and one of the first fixing part and the second fixing part becomes a hook-and-loop side hook-and-loop fastener, The other of the first fixing portion and the second fixing portion is a hook-and-loop fastener that is raised in a loop shape.

(I) 1st fixing | fixed part The surface fastener used as a 1st fixing | fixed part may be a hook-and-loop side hook-up side, and may be a loop-like hook-up side hook-and-loop fastener. In addition, about a hook_and_loop | surface fastener, since it can be set as the thing similar to a generally well-known thing, description here is abbreviate | omitted.

  Examples of the method of attaching the surface fastener to the reflection sheet include a method of attaching the surface fastener to the reflection sheet using an adhesive or the like, a method of sewing the surface fastener to the reflection sheet, and the like. The latter is preferable from the viewpoint of preventing the problem that the hook-and-loop fastener comes off.

  The first fixing portion in this aspect may be, for example, a pattern-shaped member as shown in FIG. 9 (a), and the side close to the first base material of the reflective sheet 20 as shown in FIG. 9 (b). It may be a long member extending in the longitudinal direction along the side.

  When the 1st fixing | fixed part in this aspect is a pattern-shaped member, it has a plurality of 1st fixing | fixed parts normally. It is preferable that the several 1st fixing | fixed part is parallel in parallel with the longitudinal direction of the cultivation rack. In addition, about the distance between adjacent 1st fixing | fixed part, since it can be the same as that of the content described in the above-mentioned "(a) 1st embodiment (i) 1st fixing | fixed part" section, here Description is omitted.

(Ii) Second fixing portion In this aspect, when the first fixing portion is a hook-and-loop side hook-and-loop fastener, the second fixing portion is a hook-and-loop side hook-and-loop fastener, On the other hand, when the first fixing portion is a hook-and-loop surface fastener, the second fixing portion is hook-side hook-and-loop fastener.

  The second fixing portion in this aspect may be, for example, a pattern-shaped member as shown in FIG. 9A, and although not shown, in the longitudinal direction along the side near the second base material of the reflective sheet. It may be an elongated member that extends. In addition, about a hook_and_loop | surface fastener, since it can be the same as that of the content described in the term of the said "(i) 1st fixing | fixed part", description here is abbreviate | omitted.

  When the 2nd fixing | fixed part in this aspect is a pattern-shaped member, it has two or more 2nd fixing | fixed parts normally. The number of second fixing portions is preferably the same as the number of first fixing portions described above. It is preferable that the several 2nd fixing | fixed part is parallel in parallel with the longitudinal direction of the cultivation rack. In addition, about the distance between adjacent 2nd fixing | fixed part, since it can be made to be the same as that of the content described in the term of the said "(i) 1st fixing | fixed part", description here is abbreviate | omitted.

(Iii) Arrangement of the first fixing part and the second fixing part The arrangement of the first fixing part and the second fixing part in this aspect may be any arrangement that can fix the reflecting sheet in a partially folded state. There is no particular limitation. For example, when the reflection sheet is folded in half along the horizontal direction with respect to the cultivation rack, it is preferable that the first fixing portion and the second fixing portion are arranged at the overlapping positions. It is because it can fold in the direction of the arrow along the pillar member of the cultivation rack.

  In this aspect, “the first fixing portion and the second fixing portion overlap” means that the first fixing portion 21 and the second fixing portion 22 have a pattern shape as shown in FIG. Includes not only the case where the first fixing part 21 and the second fixing part 22 completely overlap, but also the case where at least a part of the first fixing part 21 and the second fixing part 22 overlap. As shown in FIG. 9B, when at least one of the first fixing portion 21 and the second fixing portion 22 is long, at least one of the first fixing portion 21 and the second fixing portion 22 is used. The case where parts overlap.

(C) Third Embodiment This embodiment is an embodiment in which the fixing portion is a magnet sheet. When the fixing portion is a magnet sheet, a member for attaching the magnet sheet is usually required. Hereinafter, the magnet sheet is referred to as a first fixing portion, and a member for attaching the magnet sheet is referred to as a second fixing portion.

(I) First fixing portion Since the magnet sheet used as the first fixing portion in this embodiment can be generally the same as a known one, description thereof is omitted here.

  Examples of the method of attaching the magnet sheet to the reflection sheet include a method of attaching the magnet sheet to the reflection sheet using an adhesive or the like.

  The first fixing portion in this aspect may be a pattern-like member or a long-like member, for example, as in the second embodiment described with reference to FIGS. 9 (a) and 9 (b). May be.

  When the 1st fixing | fixed part in this aspect is a pattern-shaped member, it has a plurality of 1st fixing | fixed parts normally. It is preferable that the several 1st fixing | fixed part is parallel in parallel with the longitudinal direction of the cultivation rack. In addition, about the distance between adjacent 1st fixing | fixed part, since it can be the same as that of the content described in the above-mentioned "(a) 1st embodiment (i) 1st fixing | fixed part" section, here Description is omitted.

(Ii) Second fixing portion In this aspect, for example, a magnet sheet having a relationship between the first fixing portion and the S and N poles may be used as the second fixing portion, and also used as the first fixing portion. A metal sheet on which a magnetic sheet can be attached may be used as the second fixing portion. Furthermore, when the second member is made of metal, the second member may be used as the second fixing portion. That is, in this case, the magnet sheet as the first fixing portion is attached to the second member. In this aspect, from the viewpoint of the sticking force between the first fixing portion and the second fixing portion, it is preferable to use a magnet sheet having a relationship between the first fixing portion and the S and N poles as the second fixing portion. .

  The magnet sheet can be the same as the contents described in the section “(i) First fixing portion”, and the description is omitted here.

  When the 2nd fixing | fixed part in this aspect is a pattern-shaped member, it has two or more 2nd fixing | fixed parts normally. The number of second fixing portions is preferably the same as the number of first fixing portions described above. It is preferable that the several 2nd fixing | fixed part is parallel in parallel with the longitudinal direction of the cultivation rack. In addition, about the distance between adjacent 2nd fixing | fixed part, since it can be made to be the same as that of the content described in the term of the said "(i) 1st fixing | fixed part", description here is abbreviate | omitted.

(Iii) Arrangement of the first fixing part and the second fixing part The arrangement of the first fixing part and the second fixing part in this aspect may be any arrangement that can fix the reflecting sheet in a partially folded state. There is no particular limitation. For example, when the reflection sheet is folded in half along the horizontal direction with respect to the cultivation rack, it is preferable that the first fixing portion and the second fixing portion are arranged at the overlapping positions. It is because it can fold in the direction of the arrow along the pillar member of the cultivation rack.

  In this aspect, “the first fixing part and the second fixing part overlap” may be the same as the contents in the second embodiment described with reference to FIGS. 9A and 9B. Since it is possible, the description here is omitted.

(2) Penetration part The reflective sheet in this indication may have a plurality of penetration parts if needed. Since the reflection sheet arranged on the side surface of the cultivation rack has a penetrating part, a plant cultivation apparatus capable of suppressing heat and air from staying in the cultivation rack while efficiently irradiating the plant with artificial light. it can. In particular, the reflection efficiency can be maintained high by providing a minimum through portion that can suppress the retention of heat and air.

  Examples of the shape of the penetrating portion include a circular shape, an elliptical shape, a square shape, and an indefinite shape. The size of the penetrating portion is preferably, for example, 0.5 mm or more and 20 mm or less. The size of the penetrating portion refers to the longest length in the penetrating portion. For example, when the penetrating portion is circular, it corresponds to the diameter.

A region in which a plurality of penetrating portions are formed is referred to as a third region. The aperture ratio of the third region is, for example, 0.5% or more, 1% or more, or 2% or more. On the other hand, the aperture ratio of the third region is, for example, 10% or less, 6% or less, or 4% or less. Moreover, the ratio of the penetration part in a 3rd area | region is 100 pieces / m < ² > or more and 1000 pieces / m < ² > or less, for example.

  Further, the plurality of through portions may be formed in a pattern. Although the pattern shape of a penetration part is not specifically limited, For example, linear shape and strip | belt shape are mentioned. The reflective sheet preferably has a third region having a plurality of through portions and a fourth region having no through portions.

Here, the reflection sheet 20 shown in FIG. 10A has the third region X on one end side and the fourth region Y on the other end side in the short direction. Further, the third region X and the fourth region Y are each formed in a strip shape along the longitudinal direction of the reflection sheet 20. As shown in FIG. 10 (a), the length of the third region X in the lateral direction of the reflection sheet 20 and L _1, the length in the lateral direction of the reflection sheet 20 and L _2. The value of L ₁ / L ₂ is, for example, 0.3 or more, 0.5 or more, or 0.6 or more. If the value of L ₁ / L ₂ is too small, the ventilation effect may be reduced. L ₁ is, for example, not less than 10 cm and not more than 100 cm. L ₂ is, for example, not less than 20 cm and not more than 200 cm. In addition, the reflective sheet 20 shown to Fig.10 (a) is an example which abbreviate | omitted the fixing | fixed part.

  Moreover, as shown in FIG.10 (b), the reflective sheet 20 arrange | positioned at the side surface of the cultivation rack has the 3rd area | region X in the 1st member 12 side along a perpendicular direction, and the 2nd member 13 side. It is preferable to have the fourth region Y. In this case, by disposing the fourth region Y on the second member 13 side, the reflection efficiency can be maintained high, and the third region X is disposed on the first member 12 side where the reflection efficiency tends to be low due to the influence of plants or the like. Thus, the retention of heat and air can be effectively suppressed. In addition, although not shown in figure, contrary to FIG.10 (b), the reflective sheet arrange | positioned at the side surface of the cultivation rack has a 4th area | region on the 1st member side along a perpendicular direction, and the 2nd member side May have a third region. Moreover, the reflection sheet 20 shown in FIG. 10B is an example in which the fixing portion is omitted.

Moreover, the reflective sheet 20 shown to Fig.11 (a) has several 3rd area | region X and 4th area | region Y by turns in a longitudinal direction. The third region X and the fourth region Y are each formed in a strip shape along the short direction of the reflection sheet 20. As shown in FIG. 11 (a), the width of the third region X and a fourth region Y in the longitudinal direction of the reflection sheet 20, and each W ₁ and W _2. For values of W ₁ and _{W 2,} it can be set as appropriate.

  Moreover, as shown in FIG.11 (b), it is preferable that the reflective sheet 20 arrange | positioned at the side surface of the cultivation rack has several 3rd area | region X and 4th area | region Y alternately along a horizontal direction. In this case, by arranging the fourth region Y in the vicinity of the plant according to the interval between the plants to be cultivated, the reflection efficiency can be maintained high, and by arranging the third region X between the adjacent plants, Heat and air can effectively suppress stagnation.

  As another pattern shape of the penetrating portion, for example, a pattern in which a plurality of penetrating portions 25 are formed in a check shape as illustrated in FIG. For example, as shown to Fig.12 (a), the some penetration part 25 may be formed in the reflective sheet 20 uniformly. Furthermore, as shown in FIG. 12C, for example, the plurality of through portions 25 may be formed in a cut shape.

  The plurality of through portions may be arranged in a lattice. Note that the phrase “the plurality of through portions are arranged in a lattice” means that the plurality of through portions are present at lattice points of the lattice. The distance between the lattice points is preferably 1 mm or more and 10 cm or less, for example. Examples of the type of lattice arrangement include a tetragonal arrangement such as a cubic arrangement, a rectangular arrangement, and an oblique arrangement. FIG. 13A shows an example of a four-way arrangement, which is suitable when it is desired to improve the tensile strength of the reflection sheet. Further, as a kind of the lattice arrangement, a three-way arrangement is also exemplified. FIG. 13B shows an example of a three-way arrangement, which is suitable when it is desired to improve the aperture ratio of the reflection sheet.

(3) Reflective sheet It is preferable that the reflective sheet is arrange | positioned so that the both ends of a 1st member and a 2nd member may be covered in the side surface of a cultivation rack. This is because the reflection efficiency can be kept high. The method for fixing the reflection sheet is not particularly limited. The reflection sheet and the second member may be fixed by a magnet, may be fixed by a tape, may be fixed by an eyelet, and are fixed by a known fastening jig such as a bolt and a nut. Also good. When the fixing portion formed on the reflection sheet is an eyelet, the reflection sheet and the second member are preferably fixed by the eyelet. As shown in FIGS. 5A and 5B, hooks 23 for hooking eyelets used for fixing the reflection sheet 20 and the second member 13 are hooked on the eyelets as the fixing portion 21. This is because it can also be used as the hook 23 for this purpose.

  When the eyelet is provided as a fixing portion on the reflection sheet, the reflection sheet may be a region on the side near the first member of the reflection sheet and a region where the eyelet is attached may be folded. For example, FIG. 14 corresponds to a cross-sectional view taken along line AA in FIG. 4, but the reflection sheet 20 may be folded as shown in FIG. FIG. 14 shows an example in which the reflection sheet is folded twice. In the present disclosure, by folding the reflection sheet, the thickness of the reflection sheet in the region where the eyelet is attached can be increased. For this reason, it is possible to suppress breakage of the reflection sheet caused by wearing the eyelet. In addition, when folding a reflective sheet, it is preferable to sew the folded reflective sheet.

  Examples of the reflection sheet include a metal plate, a sheet obtained by bonding a resin film to a metal plate, a resin sheet, and a nonwoven fabric. Especially, it is preferable that a reflection sheet is a base material sheet | seat provided with the resin sheet with favorable irregular reflection property which added the titanium oxide at least. Moreover, the reflective sheet may be comprised only from the resin sheet and may further have another sheet | seat in addition to the resin sheet. Examples of the other sheet include a reinforcing sheet. Moreover, the base sheet and the reinforcing sheet may be laminated via an adhesive layer, or may be laminated directly without an adhesive layer. Further, other porous sheets and the like can be used as the reflection sheet.

(A) Base sheet The base sheet is a white sheet obtained by adding an inorganic filler such as titanium oxide to a polyolefin-based resin, and exhibits light reflectivity. The base sheet may have a single layer structure or a multilayer structure. When the base sheet has a multilayer structure, the resin component contained in each layer may be the same or different. As an example of a base sheet having a multilayer structure, an inner layer and two outer layers located on both sides of the inner layer, the resin components contained in the two outer layers are the same, and the resin component contained in the outer layer The base material sheet from which the resin component contained in an inner layer differs is mentioned.

  The substrate sheet may be a sheet having a void inside (porous substrate sheet), or may be a sheet having no void inside.

  The thickness of the base sheet is, for example, 25 μm or more, 30 μm or more, or 40 μm or more. If the thickness of the base sheet is too small, the strength may be lowered. On the other hand, the thickness of the base sheet is, for example, 90 μm or less, and may be 80 μm or less. When the thickness of a base material sheet is too large, the mass of an agricultural sheet will increase and handling property may fall. Moreover, since the amount of resin used increases, the manufacturing cost of agricultural sheets also increases.

  The substrate sheet preferably has a high visible light reflectance. The average reflectance of visible light (wavelength of 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 measurement conditions for the average reflectance of visible light will be described in detail in Examples. The base sheet has a total reflectance at a wavelength of 600 nm of, for example, 70% or more, 80% or more, or 90% or more.

  The base sheet preferably has high smoothness. Specifically, the arithmetic average height Sa on the substrate sheet surface is, for example, 1 μm or less, preferably 0.7 μm or less, and more preferably 0.5 μm or less. Moreover, it is preferable that the base material sheet has high antifouling property. Specifically, the contamination grade (JIS-L-1919) on the surface of the base sheet is preferably 3 or more.

(I) Polyolefin resin The base material sheet contains a polyolefin resin. Examples of polyolefin resins include olefin homopolymers, copolymers of two or more olefins, copolymers of one or more olefins and one or more polymerizable monomers that can be polymerized with olefins, and the like. Can be mentioned. Examples of the olefin (monomer unit) include ethylene, propylene, butene, hexene and the like. The copolymer may be a binary system, a ternary system, or a quaternary system. The copolymer may be a random copolymer or a block copolymer.

  Examples of the polyolefin resin include a polyethylene resin and a polypropylene resin. Examples of the polyethylene resin include high density polyethylene (HDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), and very 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 high-density polyethylene is excellent in weather resistance and tensile strength, and a sheet containing high-density polyethylene does not sag even when it is a long roll, and appearance defects due to whitening are unlikely to occur during bending.

  The polyethylene resin preferably has a melt flow rate (temperature 230 ° C., load 2.16 kg) measured in accordance with JIS K 7210 of 0.1 g / 10 min or more and 4.0 g / 10 min or less. More preferably, it is 4 g / 10 min or more and 2.0 g / 10 min or less. When the melt flow rate (MFR) is in the above range, it is particularly suitable for sheet forming by calendering.

  The base 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 homopolymerized polypropylene (h-PP), random copolymerized polypropylene (r-PP), block copolymerized polypropylene (b-PP), and metallocene polypropylene. These may be used alone or in combination of two or more. Among these, a random copolymer polypropylene is preferable. This is because random copolymer polypropylene is more flexible than homopolymer polypropylene or block copolymer polypropylene.

  The polypropylene 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 a main component of monomer units.

  The polypropylene resin preferably has a melt flow rate (temperature 230 ° C., load 2.16 kg) measured in accordance with JIS K 7210 of 0.1 g / 10 min or more and 4.0 g / 10 min or less. More preferably, it is 4 g / 10 min or more and 2.0 g / 10 min or less. When the melt flow rate (MFR) is in the above range, it is particularly suitable for sheet forming by calendering.

  The base sheet may contain a polypropylene resin as a 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 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 (so-called reactor TPO) having at least one of an ethylene-propylene copolymer component and a polybutylene component and a polypropylene component.

(Ii) Inorganic filler The base material sheet contains an inorganic filler that is at least one of calcium carbonate and titanium oxide in order to enhance whiteness and light reflectivity. The polyethylene sheet may further contain an inorganic filler such as talc, titanium oxide, titanium oxide / antimony oxide / nickel oxide solid solution, if necessary.

  The content of the inorganic filler in the base sheet is, for example, 30% by mass or more, 40% by mass or more, or 50% by mass or more with respect to the polyethylene resin. When there is too little content of an inorganic filler, the whiteness and light reflectivity of a polyethylene sheet may become low. 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 with respect to the polyethylene resin. When there is too much content of an inorganic filler, the flexibility of a polyethylene sheet may become low.

(Iii) Additive The base material sheet contains at least one of a light stabilizer, an antioxidant, and an ultraviolet absorber. The base sheet may contain at least two of a light stabilizer, an antioxidant, and an ultraviolet absorber, and may contain all of the light stabilizer, the antioxidant, and the ultraviolet absorber. Since light stabilizers, antioxidants, and UV absorbers are assumed to deteriorate due to reaction with protons in acidic solutions, light stabilizers, antioxidants, and UV absorbers are made of highly acid-resistant materials. Preferably there is.

(Light stabilizer)
Examples of the light stabilizer include a hindered amine light stabilizer, and among these, a NOR type hindered amine light stabilizer is preferable. The agricultural sheet may be exposed to an acidic environment such as acid rain, agricultural chemical application, sulfur fumigation, etc., but 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 stabilizer include, for example, Adekastab LA-81 manufactured by Adeka Corporation, Tinuvin 123 manufactured by BASF Corporation (bis (2,2,6,6-tetramethyl-1- (octyloxy) decanedioate) ) -4-piperidinyl) ester) and the like.

  The content of the light stabilizer in the base sheet is, for example, 0.05% by mass or more, may be 0.1% by mass or more, or 0.4% by mass or more with respect to the polyolefin resin. Also good. When there is too little content of a light stabilizer, the weather resistance of a base material sheet may not improve. On the other hand, the content of the light stabilizer in the base sheet is, for example, 3.0% by mass or less, may be 1.0% by mass or less, and may be 0.5% by mass or less with respect to the polyolefin resin. There may be. If the content of the light stabilizer is too large, the production unit price may increase.

(Antioxidant)
Examples of the antioxidant include a phenolic antioxidant and a phosphorus antioxidant. Examples of the phenolic antioxidant include pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 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-tert-butyl) phenol, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4hydroxybenzyl) Benzene, 3, 5 t- butyl-4-hydroxy -α- hydroxybenzene, n- octadecyl-3- (3,5-di -t- butyl-4-hydroxyphenyl) propionate and the like.

  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- 4-hydroxy-5-methylphenylthio) -5-methylphenyl] phosphite, tridecyl phosphite, octyl diphenyl phosphite, di (decyl) monophenyl phosphite, di (tridecyl) pentaerythritol diphosphite, distearyl Pentaerythritol diphosphite, di (nonylphenyl) pentaerythritol diphosphite, bis (2,4-ditert-butylphenyl) pentaerythritol diphosphite, bis (2,6-ditert-butyl-4-methylphenyl) ) Pentaerythritol diphosphite, bis (2,4 6-tritert-butylphenyl) pentaerythritol diphosphite, tetra (tridecyl) isopropylidene diphenol diphosphite, tetra (tridecyl) -4,4′-n-butylidenebis (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 diphospho Knight, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, tris (2-[(2,4,8,10-tetrakis tert-butyldibenzo [d, f] [1 , 3,2] dioxaphosphin-6-yl) oxy] ethyl) amine and the like.

  The content of the antioxidant in the base sheet is, for example, 0.05% by mass or more, may be 0.1% by mass or more, or 0.4% by mass or more with respect to the polyolefin resin. Also good. When there is too little content of antioxidant, the weather resistance of a base material sheet may not improve. On the other hand, the content of the antioxidant in the base sheet is, for example, 5.0% by mass or less, may be 3.0% by mass or less, and may be 1.0% by mass or less with respect to the polyolefin resin. There may be. When there is too much content of antioxidant, it may lead to the appearance defect by bleed-out.

(UV absorber)
Examples of the UV absorber include benzotriazole UV absorbers, triazine UV absorbers, benzophenone UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, and the like. Furthermore, examples of the benzotriazole 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-carbooctoxyethylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-3,5-dic Milphenyl) benzotriazole, 2,2′-methylenebis (4-tert-octyl-6-benzotriazolylphenol) And 2-hydroxyphenylbenzotriazole compounds.

  The content of the ultraviolet absorber in the base sheet is, for example, 0.05% by mass or more, may be 0.1% by mass or more, or 0.4% by mass or more with respect to the polyolefin resin. Also good. When there is too little content of a ultraviolet absorber, the weather resistance of a base material sheet may not improve. On the other hand, the content of the ultraviolet absorber in the base sheet is, for example, 5.0% by mass or less, may be 3.0% by mass or less, or 1.0% by mass or less with respect to the polyolefin resin. There may be. When there is too much content of a ultraviolet absorber, it may lead to the external appearance defect by bleeding out and the external appearance defect by coloring depending on the kind of ultraviolet absorber.

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

  Heavy metal deactivators are known as copper damage inhibitors. The heavy metal deactivator is not particularly limited, and examples thereof include oxalic acid derivatives, salicylic acid derivatives, hydrazide derivatives, and the like, and more specifically, trade names Eastman Inhibitor OAB H (manufactured by Eastman Kodak Company), Adekastab CDA-1 CDA-6 (manufactured by Adeka), Chele-180, Inganox MD 1024 (manufactured by BASF) and the like. Also, Japanese Patent Publication No. 37-14484, Japanese Patent Publication No. 39-9072, Japanese Patent Publication No. 39-12454, Japanese Patent Publication No. 39-19541, Japanese Patent Publication No. 40-12293, Japanese Patent Publication No. 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 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. No. 3,367,907 No., French Patent No. 1481105, French Patent No. 1495830, etc. Good.

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

(Other additives)
The base sheet may contain an appropriate amount of known additives such as other lubricants, heat stabilizers, pigments, modifiers, flame retardants, antistatic agents, reinforcing agents, and antifungal agents.

(Iv) Manufacturing method of base sheet The manufacturing method of the base sheet is not particularly limited as long as the target base sheet is obtained. For example, a polyolefin resin, a light stabilizer, an antioxidant, and The manufacturing method which has the process of producing the resin composition containing at least 1 type of an ultraviolet absorber, and forming the said resin composition into a sheet (film-forming) and producing a base material sheet is mentioned.

  The production method of the resin composition is not particularly limited, but a method of 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 more and 200 ° C. or less.

  Examples of the method for forming the resin composition into a sheet include known molding methods such as extrusion drawing, calendering, and extrusion. For example, in the case of producing a sheet (porous substrate sheet) in which the substrate sheet has voids therein, biaxial stretching and stretching in which longitudinal stretching and transverse stretching are combined in the extrusion stretching process is preferable. On the other hand, for example, when the base sheet is a sheet having a void inside (porous base sheet), particularly when the base sheet is thin, it is suitable for manufacturing a sheet having a uniform thickness. Calendar processing is preferred. The calendering process is suitable in that it easily corresponds to the size and the type of resin, and easily corresponds to a small lot due to the structure of the molding machine. For example, when using a resin composition with a high content of inorganic filler, it is preferable to mold by calendering. When the inorganic filler is contained in a large amount, for example, if it is formed by extrusion molding, the surface of the obtained sheet becomes rough and the sheet is easily torn, but such inconvenience does not occur in the molding by calendering, and the surface is smooth. Sheet can be manufactured. The superiority of calendering when using a resin composition having a high inorganic filler content is particularly noticeable when the thickness of the base sheet is as thin as about 30 μm or more and 70 μm or less.

(B) Reinforcing sheet The agricultural sheet may have a reinforcing sheet on one side of the base sheet. The reinforcing sheet is a sheet that reinforces the base sheet. The agricultural sheet may have another layer between the base sheet and the reinforcing sheet, or may be in contact with other layers.

  The reinforcing sheet preferably contains a resin. The resin may be a thermoplastic resin or a thermosetting resin, but the former is preferred. 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, and among them, a polyolefin resin is preferable. This is because heat resistance, water resistance, chemical resistance and cost are excellent. Specific examples of the polyolefin-based resin include, for example, a polyethylene-based resin and a polypropylene-based resin, and among them, a polyethylene-based resin is preferable. As polyolefin resin, the polyolefin resin described in the said base material sheet is mentioned, for example.

  Moreover, it is preferable that both a reinforcement sheet and a base material sheet contain a polyethylene-type resin. For example, when an adhesive layer to be described later is provided, since the polyethylene-based resin has the same adhesiveness to the adhesive, an agricultural sheet that is firmly bonded can be obtained. Further, since the degree of expansion and contraction due to heat, moisture, and the like is close, warpage is unlikely to occur and adhesion is difficult to peel off. As a result, an agricultural sheet with high durability is obtained. In addition, when both the reinforcing sheet and the base sheet contain a polyethylene resin, it becomes a recyclable agricultural sheet and has a low environmental impact during disposal. In particular, the entire agricultural sheet layer preferably contains a polyethylene resin.

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

  On the other hand, the agricultural sheet having a multilayer structure reinforcing sheet includes an agricultural sheet having a base sheet, an adhesive layer, and a multilayer structure reinforcing sheet in this order. The reinforcing sheet having a multilayer structure includes a first reinforcing sheet, an adhesive layer for reinforcing sheet, and a second reinforcing sheet in this order. Note that the plurality of reinforcing sheets may be in contact (for example, fused) without using an adhesive layer. Moreover, the kind of adhesive layer for reinforcement sheets is not specifically limited, The content described in the adhesive layer mentioned later may be the same.

  Although the thickness of a reinforcement sheet is not specifically limited, For example, they are 10 micrometers or more and 200 micrometers or less, and it is preferable that they are 20 micrometers or more and 180 micrometers or less. In addition, when a reinforcement sheet is a multilayer structure, it is preferable that the thickness of each layer which comprises a reinforcement sheet exists in the range mentioned above. Moreover, the agricultural sheet may have a reinforcement sheet in the outermost surface, and may have in an inside.

(C) Adhesive layer In the reflective sheet, the base sheet and the reinforcing sheet may be laminated via an adhesive layer, or may be laminated directly without using an adhesive layer. The adhesive layer is made of an adhesive material. The adhesive is not particularly limited, but is preferably a dry laminate adhesive.

  The type of adhesive is not particularly limited. For example, polyether adhesive, polyester adhesive, polyurethane adhesive, vinyl adhesive, (meth) acrylic adhesive, polyamide adhesive, epoxy adhesive Materials, rubber adhesives and the like. The adhesive may be a one-component curable type or a two-component curable type.

  Examples of the polyether adhesive include polyether polyurethane. Polyether polyurethane is obtained by the reaction of polyether polyol and polyisocyanate. Examples of the polyether polyol include a compound obtained by polymerizing an oxirane compound such as ethylene oxide or propylene oxide using a polyhydric alcohol such as ethylene glycol, 1,2-propanediol, or glycerin as a polymerization initiator.

  Examples of the polyisocyanate include 1,6-hexamethylene diisocyanate, methylene diisocyanate, trimethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, tetramethylene diisocyanate, 1, Aliphatic isocyanates such as 2-propylene diisocyanate, isopropylene diisocyanate and 1,3-butylene diisocyanate; 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, methyl -Alicyclic isocyanates such as 2,6-cyclohexane diisocyanate; m-phenylene diisocyanate, p- E D diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, aromatic isocyanates such as naphthylene diisocyanate and the like.

  Examples of the polyester adhesive include polyester polyurethane. Polyester polyurethane is obtained by the reaction between polyester polyol and polyisocyanate. Examples of the polyester polyol include a polyester polyol obtained by reacting a polyvalent carboxylic acid and a polyhydric alcohol, and a polyester polyol obtained by ring-opening polymerization of a lactone ring. Examples of the polyvalent carboxylic acid include saturated aliphatic polyvalent carboxylic acids such as adipic acid, azelaic acid, succinic acid, and sebacic acid; unsaturated aliphatic polyvalent carboxylic acids such as fumaric acid and maleic acid; 1,4- Examples thereof include alicyclic polycarboxylic acids such as cyclohexanedicarboxylic acid; aromatic polycarboxylic acids such as phthalic acid, isophthalic acid and terephthalic acid.

  Examples of the polyhydric alcohol include aliphatic and alicyclic polyhydric alcohols, and aromatic polyhydric alcohols. Specifically, ethylene glycol, diethylene glycol, 1,3-propylene glycol, dipropylene glycol, neopentyl glycol, triethylene glycol, xylylene glycol, polyethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol and the like can be mentioned. The polyisocyanate is as described above.

Moreover, you may use polyether polyester polyurethane as an adhesive material. The polyether polyester polyurethane is a polyether adhesive and a polyester adhesive. The polyether polyester polyurethane is obtained by reacting a polyether ester polyol with a polyisocyanate. As polyether ester polyol, the polyether ester polyol obtained by making said polyhydric carboxylic acid react with the said polyether polyol is mentioned, for example.

  The thickness of the adhesive layer is not particularly limited, but is preferably thinner from the viewpoint of ensuring moisture permeability. The thickness of the adhesive layer is, for example, 10 μm or less.

(D) Others The reflection sheet may or may not have a light reflection layer. When the light reflection 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, Si, calcium carbonate, barium sulfate, and the like. Examples of the resin component include polyurethane resins and polyester resins. Examples of the polyurethane resin include polyester polyurethane, polyether polyurethane, polyether polyester polyurethane, polycarbonate polyurethane, and polycaprolactam polyurethane. The arrangement position of the light reflection layer is not particularly limited, and may be the outermost surface of the reflection sheet or may be inside. Moreover, it is preferable that the light reflection layer is provided on the side opposite to the reinforcing sheet with respect to the base sheet. The thickness of the light reflection layer is, for example, not less than 0.5 μm and not more than 4 μm.

Although the thickness of a reflection sheet is not specifically limited, For example, it is 50 micrometers or more and 200 micrometers or less, and it is preferable that they are 80 micrometers or more and 150 micrometers or less. The moisture permeability of the reflective sheet may be, for example, 10 g / m ² · day or more, or 20 g / m ² · day or more.

2. Cultivation rack The cultivation rack in the present disclosure provides a first member on which a cultivation tank can be placed, a second member disposed with a space for the first member, and a space for the first member. And a structure having a lighting member disposed on the first member side relative to the second member, and a plurality of pillar members that fix the positions of the first member and the second member. . In addition, "it can mount a cultivation tank" means that it can mount with respect to a 1st member directly or via another member. Moreover, the 1st member does not necessarily need to be able to mount a cultivation tank independently. For example, the cultivation tank can be connected to a pillar member or the like, and the first member may be in a state in which the cultivation tank can be placed by dispersing the weight of the cultivation tank by the connection.

(1) 1st member, 2nd member, and pillar member The frame of a cultivation rack is formed by the 1st member, the 2nd member, and a plurality of pillar members. The materials of the first member, the second member, and the plurality of column members are not particularly limited, and examples thereof include metals such as stainless steel, iron, and aluminum. For example, the first member and the second member may be plate-shaped or mesh-shaped. Moreover, although the planar view shape of a 1st member and a 2nd member is not specifically limited, For example, a square, a rectangle, etc. are mentioned. Examples of the cross-sectional shape of the column member include a circle, a square, and a rectangle. The number of column members is preferably such that the first member and the second member can be stably fixed, for example, 3 or more, 4 or more, or 8 or more. It is preferable that the 1st member and the 2nd member, and the column member are connected using a well-known connector.

Although the shape of the cultivation tank mounted in a 1st member is not specifically limited, Pot shape, a bag shape, a bed shape etc. are mentioned. Moreover, hydroponics (floating type hydroponics, NFT type hydroponic cultivation) may be performed using a cultivation tank, and soil culture cultivation may be performed. Alternatively, rock wool may be cultivated by placing a rock wool mat on the first member and placing a rock wool pot thereon. Moreover, the coco bag cultivation which utilized the coco peat which is easy to discard after use instead of rock wool as a culture medium may be used.

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

  The illumination member has at least a light source. Examples of the light source include an LED and a fluorescent lamp. Among these, an LED is preferable. This is because 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. Moreover, it is preferable that the light source is arrange | positioned directly or through another layer in the board | substrate. A refrigerant pipe may be connected to the substrate. This is because the heat generated from the light source can be removed. Examples of the material for the substrate include aluminum and copper. Examples of the refrigerant include ammonia and water.

  Further, a reflecting plate may be disposed between the light source and the substrate. This is because even when the light emitted from the light source is reflected from the culture medium surface of the cultivation tank and returned to the light source, the reflected light can be irradiated again to the plant by providing the reflector.

  Moreover, you may change the number of light sources according to the growth of a plant. This is because plants require different amounts of light depending on the growth stage. That is, it is preferable that plants with thick leaves and close to harvest time have a large amount of light, and plants that have just sprouted and have small leaves still have a small amount of light. By setting the amount of light appropriately as described above, the number of light sources can be reduced as a result, and the equipment cost and the running cost can be reduced.

(3) Cultivation rack A cultivation rack has a structure which has a 1st member, a 2nd member, a lighting member, and a plurality of pillar members. The cultivation rack may have one or more of the above 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 have the function of the first member. For example, in FIG. 2, the second member 13 of the second structural body 16 from the top is provided with the illumination member 14 on one surface side, and the cultivation tank 11 is 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. The cultivation rack may be a hanging type.

3. Plant cultivation device The plant cultivation device of this indication is provided with the cultivation rack and reflection sheet which were mentioned above at least. 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 unit for storing the culture solution, a piping unit and a pump unit for circulating the culture solution in the storage unit, and a culture solution in the piping unit connected to each cultivation tank are supplied to the cultivation tank. And an apparatus having a supply unit to be used. Moreover, the plant cultivation apparatus 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 that increase the CO ₂ concentration in the cultivation rack as necessary. May be.

  Although the use of a plant cultivation apparatus is not specifically limited, It is preferable to use for artificial light type cultivation which does not utilize sunlight. Moreover, you may use a plant cultivation apparatus as a seedling raising apparatus. The plant cultivated by the plant cultivation device may be a long-day plant (a plant that responds to the long day to regulate flower bud formation), or a short-day plant (a plant that reacts to the short day 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, and flowering plants. Examples of the leafy vegetables include lettuce, chingensai, arugula, coriander, basil, celery, kale, egoma, ice plant, saffron and the like. Examples of fruit vegetables include tomatoes, okra, squash, cucumber and the like.

B. Reflective sheet The reflective sheet of the present disclosure provides a first member on which a cultivation tank can be placed, a second member disposed with a space for the first member, and a space for the first member. And a unit structure having a lighting member arranged closer to the first member than the second member, and a plurality of pillar members fixing positions of the first member and the second member. It is a reflection sheet disposed on at least the side surface in the longitudinal direction of the cultivation rack, and is a member provided with a fixing portion on the surface opposite to the surface facing the cultivation rack.

  According to the present disclosure, since the reflection sheet disposed on the side surface of the cultivation rack has a fixing portion, while irradiating the plant with artificial light efficiently, for example, when performing maintenance of the plant during cultivation, It can be set as the reflective sheet which can suppress the fall of the working efficiency by a reflective sheet. In addition, about the detail of a reflection sheet, since it can be made to be the same as that of the content described in the said "A. plant cultivation apparatus 1. reflection sheet", description here is abbreviate | omitted.

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

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

  In addition, the total amount of the polyethylene-type resin contained in the obtained kneaded material is 116 mass parts, and content of the NOR type hindered amine light stabilizer with respect to a polyethylene-type resin is 0.34 mass%. Moreover, content of the inorganic fillers 1 and 2 with respect to a polyethylene-type resin is 51.7 mass%.

  Next, the obtained kneaded material is supplied to a 12 inch diameter × 30 L common head type mixing roll (rotational speed: 18 rpm), rolled at a roll temperature of 165 ° C. or more and 190 ° C. or less, and a base sheet having a thickness of 60 μm (Polyethylene sheet) was obtained.

(Production of reflection sheet)
A base sheet and a reinforcing sheet were prepared. 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 sheet, and an anchor coating agent layer having a thickness of 0.5 g / m ² (dry state) Formed. Furthermore, on the anchor coating agent layer, low density polyethylene (LDPE, MI = 8.0, density = 0.92) was melt-extruded (extrusion coating) at a thickness of 15 μm while being subjected to ozone treatment, Agricultural sheets were produced by pasting them together with reinforcing sheets. The molten resin temperature of LDPE was 320 ° C.

  Visible light reflectance measurement, smoothness evaluation, and antifouling evaluation were performed on the obtained reflection sheet. In the visible light reflectance measurement, an ultraviolet / visible / near infrared spectrophotometer (Shimadzu Corporation UV-3600) and an integrating sphere attachment device (ISR-3100) are used, and the visible region is 380 nm or more and 780 nm or less at an incident angle of 8 °. The reflectance (total reflectance) was measured and the average reflectance was determined. As a standard plate, Spectralon (manufactured by Teflon (registered trademark)) manufactured by Labsphere, USA was used. The measurement surface was the surface of the base sheet of the reflective sheet. As a result, the visible light reflectance was 94%. In the antifouling evaluation, the contamination grade was evaluated based on JIS-L-1919. As a result, the contamination grade was 3.0.

  Next, eyelet processing was performed on the obtained reflection sheet as a fixing portion, and eyelets were formed at intervals of 40 cm. The eyelet equally divides the region of the reflection sheet in the vertical direction, and in the reflection sheet, the region on the first member side of the cultivation rack is the first region, and the region on the second member side is the second region. When it did, it created in each of the 1st field and the 2nd field. In addition, when a plurality of eyelets created with a predetermined interval in the first region are used as a first fixing portion, and a plurality of eyelets created with a predetermined interval in the second region are used as a second fixing portion, a plurality of first eyelets are used. The fixing part and the plurality of second fixing parts were arranged so that each of the fixing parts overlapped when the reflection sheet was folded in half.

[Example]
In an artificial light plant factory, 50 leaf lettuce seedlings were cultivated for 21 days in a cultivation rack for hydroponics having a height of 30 cm, a width of 1 m, and a depth of 1.2 m. It fixed using the 2nd fixing | fixed part provided in the 2nd area | region of the reflection sheet of 30 cm x 1 m on two side surfaces which oppose the longitudinal direction of a cultivation rack. In addition, the 2nd fixing | fixed part is the eyelet produced in the eyelet process mentioned above, and it fixed by hooking on the U-shaped hook attached to the cultivation rack as shown in FIG. Thereby, the side of the cultivation rack was covered with a reflective sheet without a gap. In the reflection sheet, 35 circular penetrating portions having a diameter of 10 mm were formed 15 cm below the side surface of the cultivation rack, and no penetrating portions were formed 15 cm above the side surface of the cultivation rack. The arrangement of the penetrating portions was the arrangement shown in FIG. The leaf lettuce that had been harvested 21 days after the planting was harvested and the yield was measured, and the total amount was 3.3 kg. In addition, when taking care of leaf lettuce during cultivation and maintenance of the culture solution, it was possible to hook the eyelet, which is the first fixed part, on the U-shaped hook attached to the cultivation rack. The decrease in efficiency could be suppressed.

DESCRIPTION OF SYMBOLS 10 ... Cultivation rack 11 ... Cultivation tank 12 ... 1st member 13 ... 2nd member 14 ... Illumination member 15 ... Column member 16 ... Structure 20 ... Reflective sheet 21 ... Fixed part 25 ... Penetration part 100 ... Plant cultivation apparatus

Claims (5)

A first member capable of placing a cultivation tank, a second member disposed with a space with respect to the first member, a space with respect to the first member, and the second member A cultivation rack having a structure having a lighting member disposed on the first member side with respect to the member, and a plurality of pillar members that fix the positions of the first member and the second member;
A reflective sheet disposed on at least the side surface of the cultivation rack in the longitudinal direction and having visible light reflectivity;
With
The said reflection sheet is provided with the fixing | fixed part which can be made into the state which folded the said reflection sheet along the horizontal direction with respect to the said cultivation rack in the surface on the opposite side to the surface facing the said cultivation rack. Cultivation equipment.   When the region of the reflection sheet is equally divided in the vertical direction, the region on the first member side of the reflection sheet is a first region, and the region on the second member side of the reflection sheet is a second region, The plant cultivation device according to claim 1 provided with said fixed part in said 1st field. The fixing portion is provided in the first region and the second region,
When the fixed portion of the first region is a first fixed portion, the fixed portion of the second region is a second fixed portion, and the reflective sheet is folded in half along the horizontal direction with respect to the cultivation rack The plant cultivation apparatus according to claim 2, wherein the first fixing part and the second fixing part are in an overlapping position.   The plant cultivation device according to any one of claims 1 to 3, wherein the fixing portion is a eyelet, a hook-and-loop fastener, or a magnet sheet.   A first member capable of placing a cultivation tank, a second member disposed with a space with respect to the first member, a space with respect to the first member, and the second member At least on the side surface in the longitudinal direction of a cultivation rack having a unit structure having a lighting member arranged on the first member side with respect to the member and a plurality of pillar members for fixing the positions of the first member and the second member A reflective sheet that is disposed and includes a fixing portion on a surface opposite to a surface facing the cultivation rack.