Tree shelter

Abstract

To provide a tree shelter that adequately protects seedlings and other plants and is efficiently biodegraded in normal environments after use.SOLUTION: A tree shelter 10 is characterized by consisting of a sheet-like cylindrical body 20 whose main member is a cellulose-derived material that is regenerated by coating a surface of base paper made from hemp with viscose. With respect to supports 50 erected near a protection target plant 40, the cylindrical body 20 is installed passing through on an outer side of supports 50 in a direction that opens up at a top and bottom so as to cover an outer periphery of the plant 40.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to tree shelters, and more particularly to tree shelters made from biodegradable materials. [Background technology]

[0002] For example, tree shelters are used as a measure to protect plants such as seedlings after planting from damage caused by animals such as deer. This tree shelter has a cylindrical body that is placed over the seedling, and the cylindrical body is generally made of a plastic material that is excellent in light transmission, weather resistance, impact resistance, etc. When such tree shelters need to be removed after the seedlings have grown, they require a lot of effort in disposing of them after use, such as retrieving them from the removal site and disposing of them by incineration or landfilling after retrieval.

[0003] In order to save such trouble, a tree shelter has been proposed in which the cylindrical body is formed from a biodegradable resin sheet instead of the above-mentioned plastic material (see Patent Document 1). The biodegradable resin sheet used contains polylactic acid, which has excellent self-supporting properties. Unlike plastic resin, biodegradable resin is decomposed by microorganisms, so it is thought that the trouble of collecting the sheet can be saved and incineration or the like will not be necessary when disposing of the tree shelter. Therefore, it is excellent in terms of work efficiency and disposal costs, and can also contribute to reducing the environmental load.

[0004] However, polylactic acid, which is contained as the main component of the biodegradable resin sheet used in the tree shelter, hardly decomposes under normal conditions, but decomposes under specified conditions of temperature, humidity, etc., such as a temperature of 60° C. and a humidity of 60% RH. Therefore, in order to properly decompose the biodegradable resin sheet, it was necessary to secure a specific removal site and satisfy the decomposition conditions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-134686 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned points, and provides a tree shelter that enables appropriate protection of plants such as seedlings and is efficiently biodegradable in normal environments after use. [Means for solving the problem]

[0007] That is, the first invention relates to a tree shelter characterized by comprising a cylindrical body of a sheet-like material whose main component is a cellulose-derived material formed by coating the surface of base paper made from hemp and regenerating it with viscose.

[0008] The second invention relates to a tree shelter in which, in the first invention, the cylindrical body is installed on a support pole erected near the plant to be protected, so as to cover the outer periphery of the plant through the outside of the support pole in a direction that opens up at the top and bottom.

[0009] A third invention relates to a tree shelter according to the first invention, wherein a plurality of small holes are formed in the cylindrical body.

[0010] A fourth invention relates to the tree shelter of the first invention, wherein an average total light transmittance, which is an average value of total light transmittances measured at a plurality of measurement points on the cylindrical body, is 80 to 85%.

[0011] The fifth invention relates to a tree shelter according to the first invention, wherein the average vertical tear strength, which is the average value of the vertical tear strength measured at multiple measurement points on the tubular body, is 630 to 1000 mN, and the average horizontal tear strength, which is the average value of the horizontal tear strength measured at multiple measurement points on the tubular body, is 630 to 1000 mN.

[0012] The sixth aspect of the present invention is the method for producing a cylindrical body according to the first aspect of the present invention, wherein the average surface resistivity, which is an average value of surface resistivities measured at a plurality of measurement points on the cylindrical body, is 1.0×10 10 This relates to tree shelters that are less than Ω. Effect of the Invention

[0013] The tree shelter of the first invention comprises a sheet-like cylindrical body whose main component is a cellulose-derived material formed by coating the surface of base paper made from hemp with viscose and regenerating it, which allows for appropriate protection of plants such as seedlings and is also efficiently biodegradable in normal environments after use.

[0014] According to the tree shelter of the second invention, in the first invention, the cylindrical body is installed on a support pole erected near the plant to be protected, so that it passes through the outside of the support pole in a direction that opens up at the top and bottom to cover the outer periphery of the plant, thereby making the installation work easy with a simple structure and providing appropriate protection for the plant.

[0015] According to the tree shelter of the third invention, in the first invention, a plurality of small holes are formed in the cylindrical body, so that the exhaust property and breathability of the cylindrical body are good.

[0016] According to the tree shelter of the fourth invention, in the first invention, the average total light transmittance, which is the average value of the total light transmittance measured at multiple measurement points on the tubular body, is 80 to 85%, so that plants covered with the tubular body can be irradiated with light necessary for their growth.

[0017] According to the tree shelter of the fifth invention, in the first invention, the average vertical tear strength, which is the average value of the vertical tear strength measured at multiple measurement points on the tubular body, is 630 to 1000 mN, and the average horizontal tear strength, which is the average value of the horizontal tear strength measured at multiple measurement points on the tubular body, is 630 to 1000 mN, so that the tubular body can be prevented from being torn apart by animals.

[0018] According to the tree shelter of the sixth aspect of the present invention, in the first aspect of the present invention, the average surface resistivity, which is the average value of the surface resistivity values ​​measured at a plurality of measurement points on the cylindrical body, is 1.0×10 10 Since the resistance is Ω or less, good antistatic performance can be obtained, and the attraction of dust and the like can be suppressed. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a perspective view of a tree shelter according to one embodiment of the present invention before use. [Diagram 2] This is an oblique view showing the tree shelter in use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] 1 and 2, a tree shelter 10 according to an embodiment of the present invention is a member for protecting plants 40, such as seedlings, from damage caused by animals after planting, and is made of a sheet-like cylindrical body 20. The plants 40 protected by the tree shelter 10 are not limited to seedlings, but may include various trees in the growing process.

[0021] The sheet-like cylindrical body 20 is mainly made of a cellulose-derived material obtained by applying viscose to the surface of base paper made from hemp and regenerating it. Base paper made from hemp is a sheet-like material obtained from known hemp fibers, and hemp paper made from Manila hemp is preferably used. The viscose applied to this hemp paper is a cellulose solution derived from pulp, a natural material, and is used as a coating agent that has strength and weather resistance. For example, a mixture of 70 wt% cellulose, 22 wt% glycerin, and 8 wt% water is preferably used for the cylindrical body 20.

[0022] The main member made of a cellulose-derived material is a sheet-like material formed by impregnating the above-mentioned hemp-based base paper with viscose. Since this main member is hemp paper coated with viscose, it is lightweight yet has excellent strength, can ensure self-supporting, and has moderate flexibility, making it less likely to crack. Therefore, it can effectively protect the plant 40 from damage caused by animals, and has excellent weather resistance and durability, so it can withstand exposure to wind and rain. In addition, the thickness of the main member is not particularly limited as long as it can protect the plant 40, but it may be, for example, about 80 to 100 μm thick.

[0023] The cylindrical body 20 is made by forming a sheet-like main member into a cylindrical shape, and is placed so as to cover the surroundings of the plant 40 to be protected. Since the cylindrical body 20 is made of a material derived from cellulose, the minute gaps between the cellulose fibers allow air and water vapor to pass through appropriately, creating a stable growing environment.

[0024] In addition, the cylindrical main body 20 is formed into a cylindrical shape in advance, but can be transported to the installation site in a flat folded state. Therefore, the absolute amount of the cylindrical member 20 transported to the installation site at one time can be significantly increased. This cylindrical main body 20 can be formed into a cylindrical shape from a folded state at the installation site. Furthermore, since the cylindrical main body 20 is made of a material derived from cellulose, it can be cut and adjusted to any height. In addition, the diameter of the cylindrical member 20 can also be adjusted to any dimension when the main member is manufactured. In this way, since the diameter and height of the cylindrical main body 20 can be adjusted arbitrarily, it can be applied to plants 40 of various sizes and shapes, and is highly versatile. Note that the cylindrical member 20 is not limited to being transported to the installation site in a flat folded state, but may be formed into a cylindrical shape from a sheet-like main member at the installation site. In such a case, the diameter of the cylindrical shape can be adjusted to any size at the installation site according to the plant 40 to be protected. In addition, there is also an advantage that the main member can be transported and stored in a sheet form.

[0025] The diameter and height of the cylindrical main body 20 are not particularly limited, but it is preferable to use, for example, a diameter of about 35 mm to about 173 mm and a height of about 200 mm to about 2000 mm. When forming the sheet-like main member into a cylindrical shape, no adhesive is used, and viscose plays the role of adhesive, which is also preferable from the viewpoint of environmental burden, etc. It is also possible to form the cylindrical member 20 into a cylindrical shape from the sheet-like main member at the installation site, and in that case, the shape may be fixed using an adhesive, etc., but it is also preferable from the viewpoint of environmental burden, etc. to fix the shape using an appropriate fixing member such as a connector without using an adhesive, etc.

[0026] In the tree shelter 10 of the present invention, a plurality of small holes 30 may be formed in the cylindrical body 20 in anticipation of the protection of plants and the like that are vulnerable to moisture. The small holes 30 are through holes that connect the inside of the cylindrical body 20 to the outside, and allow air and water vapor (moisture) to pass through efficiently through the fine gaps in the cellulose fibers. The small holes 30 can be formed by a known method such as laser drilling or needle drilling. The size and number of the small holes 30 are appropriately set according to the application, etc., but for example, in the case of a tree shelter 10 with a cylindrical body 20 having a diameter of about 173 mm and a height of about 1000 mm, it is preferable that the hole diameter is about 0.3 mm, the interval between adjacent small holes 30 is about 7 mm, and the number of small holes 30 is about 5000 to 10000. This makes it easier to transmit water vapor that evaporates from the air or the ground. Therefore, the inside of the cylindrical body 20 can be kept at a temperature and humidity suitable for the growth of plants and the like that are vulnerable to moisture. In FIG. 1, the small holes 30 are exaggerated relative to the size of the cylindrical body 20, and only a portion of the small holes are shown, with the remaining small holes not shown.

[0027] In the tree shelter 10 of the present invention, the average total light transmittance, which is the average value of the total light transmittance measured at a plurality of measurement points of the cylindrical body 20, is preferably 80 to 85%, particularly 82 to 85%. The average total light transmittance is an index of light transmission performance indicating that light is easily incident from the outside to the inside of the cylindrical body 20. Since the cylindrical body 20 uses base paper made of hemp as a constituent material, it is considered difficult to make the overall physical properties uniform due to the nature of the material. Therefore, the total light transmittance was measured at a plurality of measurement points randomly selected in the sheet-like material constituting the cylindrical body 20, and the average value (average total light transmittance) was adopted as the light transmission performance of the cylindrical body 20.

[0028] In the tree shelter 10 of the present invention, from the viewpoint of preventing the cylindrical main body 20 from being torn by animals, the average vertical tear strength, which is the average value of the vertical tear strengths measured at multiple measurement points on the cylindrical main body 20, is preferably 630 to 1000 mN, particularly preferably 630 to 980 mN. Furthermore, the average horizontal tear strength, which is the average value of the horizontal tear strengths measured at multiple measurement points on the cylindrical main body 20, is preferably 630 to 1000 mN, particularly preferably 630 to 810 mN.

[0029] The average longitudinal tear strength and the average transverse tear strength are indicators of protective performance for judging the resistance of the tubular body 20 to breakage. The reason for adopting the average values ​​of longitudinal and transverse tear strengths (average longitudinal tear strength, average transverse tear strength) measured at multiple measurement points of the tubular body 20 as indicators is the same as the reason for adopting the average total light transmittance described above. By increasing the average tear strength in each direction, it is possible to effectively prevent the tubular body 20 from being torn by animals. If the average tear strength in each direction is too low, the tubular body 20 may be easily torn by animals. Note that even if there is a point among the measurement points of the tubular body 20 where the average tear strength in each direction is lower than the average tear strength, it is considered that the tubular body 20 satisfies the performance of preventing the tubular body 20 from being torn by animals as long as the average tear strength in each direction satisfies the above value.

[0030] In the tree shelter 10 of the present invention, the average surface resistivity, which is the average value of the surface resistivity values ​​measured at multiple measurement points on the cylindrical body 20, is 1.0×10 10 Ω or less, especially 7.0×10 5 ~1.3×10 6 Ω is preferable. The average surface resistivity is an index representing the antistatic performance of the cylindrical body 20. The reason for adopting the average value of the surface resistivity values ​​measured at multiple measurement points on the cylindrical body 20 (average surface resistivity) as this index is the same as the reason for adopting the average total light transmittance described above. The smaller the average surface resistivity of the cylindrical body 20, the less likely it is to become charged, and the more likely it is that adhesion of dirt and the like can be suppressed.

[0031] An example of use of the tree shelter 10 of the present invention will be described with reference to Figures 1 and 2. Here, an example of use of the tree shelter 10 using two supports 50 will be described. As shown in Figure 1, first, each support 50 is driven into the ground and erected near the plant 40 to be protected by the tree shelter 10. These two supports 50 are preferably arranged within the range of the diameter of the cylindrical body 20 with the plant 40 at the center. These supports 50 are installed so as to cover the outer periphery of the plant 40 through the outside of the supports 50 in the direction in which the cylindrical body 20 opens up and down (the up and down direction in Figure 1).

[0032] Next, it is preferable to fix the cylindrical body 20 to each support 50 using a connector (not shown) or the like. As a result, as shown in Fig. 2, the cylindrical body 20 is supported by the two supports 50, and the plant 40 located inside the cylindrical body 20 can be appropriately protected.

[0033] When installing the tree shelter 10, at least one support 50 needs to be installed, and three or more support posts 50 may be installed. The installation locations of the support posts 50 are not particularly limited as long as they are not arranged unnecessarily, but it is preferable to arrange the support posts 50 around the plant 40 to stabilize the cylindrical body 20. In an example in which one support post 50 is installed around the plant 40, the support post 50 can support an appropriate position of the cylindrical body 20, such as the upper end, center, or lower end, via a connector, thereby fixing the cylindrical body 20 to the support post 50.

[0034] When using the tree shelter 10 to protect the plant 40 in this way, it is only necessary to cover the outer periphery of the plant 40 by passing the cylindrical body 20 over the outside of the support 50 in the direction in which it opens up and down, so the simple structure makes installation easy and properly protects the plant 40. Also, the tree shelter 10 requires less labor in installation because the cylindrical body 20 is made of a cellulose-derived material and is lightweight.

[0035] A field test was conducted on the tree shelter 10 installed around the plant 40 to protect the plant 40. As a result, it was confirmed that the tree shelter 10 maintained a state in which the plant 40 was appropriately protected for more than three months.

[0036] Next, the cellulose-derived material constituting the cylindrical body 20 of the tree shelter 10 will be described. As described above, conventional tree shelters generally have cylindrical bodies made of plastic materials with excellent light transmission, weather resistance, impact resistance, etc. Such tree shelters require a lot of work to dispose of after removal, so to eliminate the hassle, biodegradable resin sheets mainly composed of polylactic acid have been used.

[0037] Here, biodegradability means the ability of a target substance to be decomposed by microorganisms, and the biodegradability evaluated by the OECD TG 301F method is known as an indicator of this. Biodegradability is a value that indicates the percentage (%) of organic matter that is decomposed by microorganisms in a certain period of time. For example, according to the "28th Chemicals Evaluation and Research Institute Research Presentation Abstracts (2023) Biodegradability Evaluation of Plastics ~Toward European Microplastics Regulation~" (https: / / www.cerij.or.jp / event / pdf / 2023_research3.pdf), the biodegradability of polylactic acid was less than 6% in all cases when the incubation temperature of the test culture medium was approximately 22°C and evaluated by the OECD TG 301F method (see Table 2 of the Abstracts mentioned above), indicating that it hardly decomposes under normal conditions.

[0038] In contrast, the biodegradability of cellulose is about 70% to about 85% (see Table 2 in the above-mentioned collection of abstracts), which indicates that it has excellent biodegradability under normal environments. For example, when the tree shelter 10 of the present invention was decomposed in a home composter, CO2 generated during the biodegradation of cellulose was examined, and CO2 was no longer detected after 12 weeks, indicating that the cellulose had been decomposed.

[0039] Therefore, in the tree shelter 10 of the present invention, the cylindrical body 20 capable of adequately protecting the plants 40 as described above is made of a material derived from cellulose, and is therefore expected to biodegrade efficiently in a normal environment. Therefore, the tree shelter 10 of the present invention does not require collection and subsequent incineration when removed, and can be disposed of by biodegradation simply by leaving it at a designated removal site. In particular, since the tree shelter 10 of the present invention is made of a material derived from cellulose, it does not need to be biodegraded under specific environmental conditions as with conventional tree shelters made of polylactic acid, and can be biodegraded efficiently in a normal environment. EXAMPLES

[0040] In order to evaluate the protective performance of the tree shelter made of hemp-based materials, the physical properties of the constituent materials of the tree shelter were evaluated. In the performance evaluation of the constituent materials, a light transmission performance test, a protective performance test, and an antistatic performance test were conducted for the following prototypes 1 to 3 and comparative example 1, and the obtained test results were evaluated as the protective performance of the tree shelter made of the constituent materials of prototypes 1 to 3 and comparative example 1.

[0041] [Creation of component materials] As the constituent material for prototypes 1 to 3, a sheet-like base paper made from hemp with a thickness of 80 μm was formed into a cylindrical shape with a specified diameter, coated with viscose, and then recycled to obtain a cylindrical body with a height of 1000 mm.

[0042] [Prototype 1] Prototype example 1 is a cylindrical main body whose diameter was adjusted so that the dimension in the width direction (folded diameter) when folded flat was approximately 55 mm.

[0043] [Prototype 2] Prototype 2 is a cylindrical main body obtained by adjusting the folded diameter to about 118 mm.

[0044] [Prototype 3] Prototype 3 is a cylindrical main body obtained by adjusting the folded diameter to about 272 mm.

[0045] [Comparative Example 1] Comparative Example 1 is a plastic sheet made of PET (polyethylene terephthalate) having a thickness of about 80 μm, which is used as a constituent material for commercially available tree shelters.

[0046] [Light transmission performance test] The average total light transmittance (%) was used as an index for evaluating the light transmission performance. The average total light transmittance was calculated as the average value of the total light transmittance (%) of the test pieces obtained from multiple measurement points of the constituent materials of Prototype Examples 1 to 3 and Comparative Example 1. The test pieces were cut out at random from three points (N=1 to 3) with a size of 50 mm length x 50 mm width from the constituent materials of each of Prototype Examples 1 to 3 and Comparative Example 1. The total light transmittance of each test piece (N=1 to 3) of each of Prototype Examples 1 to 3 and Comparative Example 1 was measured using a turbidity meter (manufactured by Nippon Denshoku Industries Co., Ltd., "NDH-5000") with the instrument settings set to JIS K 7361-1 (1997). The measured values ​​and average values ​​of each of Prototype Examples 1 to 3 and Comparative Example 1 are shown in Table 1.

[0047] [Table 1]

[0048] [Protection performance test] The average tear strength (mN) was used as an index for evaluating the protective performance. The average tear strength was expressed as the average tear strength in the longitudinal direction (average longitudinal tear strength) calculated from the average tear strength (mN) in the longitudinal direction of test pieces obtained from multiple measurement points of the constituent materials of Prototype Examples 1 to 3 and Comparative Example 1, and the average tear strength in the transverse direction (average transverse tear strength) calculated from the average tear strength (mN) in the transverse direction of the same test pieces.

[0049] The test pieces were cut out at random from six locations (N=1-6) with a size of 63.5 mm length x 50 mm width from the constituent materials of each of the prototypes 1-3 and the comparative example 1. After conditioning each of the test pieces (N=1-6) for 2 hours or more in an environment with a temperature of 20°C and a humidity of 65% RH, the test pieces were measured using a light-load tear tester (manufactured by Toyo Seiki Seisakusho Co., Ltd., "No. 193") by measuring the load at the point where the test piece was torn in the vertical direction as the vertical tear strength, and the load at the point where the test piece was torn in the horizontal direction as the horizontal tear strength. The measured values ​​and average values ​​of each of the prototypes 1-3 and the comparative example 1 are shown in Table 2.

[0050] [Table 2]

[0051] [Antistatic performance test] The average surface resistivity (Ω) was used as an index for evaluating antistatic performance. The average surface resistivity was calculated as the average value of the surface resistivity (Ω) of test pieces obtained from multiple measurement points of the constituent materials of Prototype Examples 1 to 3 and Comparative Example 1. The test pieces were cut out at random from two points (N=1-2) with a size of 50 mm length x 50 mm width from the constituent materials of each of Prototype Examples 1 to 3 and Comparative Example 1. After conditioning the test pieces (N=1-2) of each of Prototype Examples 1 to 3 and Comparative Example 1 for 2 hours or more at a temperature of 20°C and a humidity of 65% RH, the surface resistivity was measured using an ultra insulation meter (SM-8220, manufactured by Hioki Manufacturing Co., Ltd.) with an applied voltage of 100 V. The measured values ​​and average values ​​of each of Prototype Examples 1 to 3 and Comparative Example 1 are shown in Table 3. Note that when the measured surface resistivity value was 1×10 14Anything over Ω is marked as "OR" in Table 3 as over range.

[0052] [Table 3]

[0053] [Results and Discussion] In the prototypes 1 to 3, the cylindrical body was made of a cellulose-derived material, whereas in the comparative example 1, the cylindrical body was made of a plastic sheet made of PET (polyethylene terephthalate), which is used as a constituent material for commercially available tree shelters.

[0054] As can be seen from Table 1, when comparing Prototypes 1 to 3 with Comparative Example 1, the average total light transmittance of Prototypes 1 to 3 was about 82% to about 85%, while the average total light transmittance of Comparative Example 1 was 86%, so there was not much difference between the average total light transmittance values ​​of the two. From this, it was confirmed that Prototypes 1 to 3 made of a cellulose-derived material have light transmission performance equivalent to that of Comparative Example 1 made of a plastic material. Therefore, with regard to Prototypes 1 to 3 made of a cellulose-derived material, light necessary for growth can be irradiated to a plant covered with the cylindrical main body by passing through the cylindrical main body.

[0055] As can be seen from Table 2, the average longitudinal tear strength of prototypes 1 to 3 was about 800 mN to about 980 mN, and the average longitudinal tear strength of comparative example 1 was 624 mN. From this result, it was confirmed that the average longitudinal tear strength of prototypes 1 to 3 made of cellulose-derived material exceeded the average longitudinal tear strength of comparative example 1 made of plastic material. Furthermore, the average transverse tear strength of prototypes 1 to 3 was about 700 mN to about 800 mN, and the average transverse tear strength of comparative example 1 was 630 mN. From this result, it was confirmed that the average transverse tear strength of prototypes 1 to 3 made of cellulose-derived material also exceeded the average transverse tear strength of comparative example 1 made of plastic material. From these, it can be seen that the tree shelter in which the cylindrical body is made of a cellulose-derived material has excellent longitudinal and transverse break resistance of the cylindrical body, so that the cylindrical body can be effectively prevented from being eaten by animals such as deer, and therefore the plants covered by the cylindrical body can be protected from being eaten by animals.

[0056] As can be seen from Table 3, the average surface resistivity of prototypes 1 to 3 was 7.0 × 10 5 ~1.3×10 6 Ω, and the average surface resistivity of Comparative Example 1 was 1×10 14 Ω or more (OR). From this, it was confirmed that the average surface resistivity of prototypes 1 to 3 made of cellulose-derived material was lower than the average surface resistivity of comparative example 1 made of plastic material. Therefore, the tree shelter in which the cylindrical body is made of cellulose-derived material has excellent antistatic performance, and therefore it is possible to suppress adhesion of dirt and the like to the cylindrical body.

[0057] As described above, it was confirmed that Prototypes 1 to 3 exhibited equal or superior light transmission, protection, and antistatic properties compared to Comparative Example 1. Therefore, plants can be effectively protected. In addition, Prototypes 1 to 3 are made of highly biodegradable materials, and therefore can contribute greatly to reducing environmental impact compared to conventional products. [Industrial Applicability]

[0058] The tree shelter of the present invention is made of a cylindrical sheet-like body mainly made of a cellulose-derived material, so it can cover and properly protect plants such as seedlings, and can be efficiently biodegraded in normal environments when removed. Therefore, it is a promising alternative to conventional tree shelters. [Explanation of symbols]

[0059] 10. Tree Shelter 20 Cylindrical body 30 small hole 40 plants 50 pillars

Claims

1. This tree shelter is characterized by comprising a cylindrical sheet-like body whose main component is a cellulose-derived material that is produced by coating the surface of base paper made from hemp with viscose and regenerating it.

2. The tree shelter as described in claim 1, wherein the cylindrical body is installed on a support pole erected near the plant to be protected, so that the cylindrical body passes through the outside of the support pole in a direction that opens up at the top and bottom, covering the outer periphery of the plant.

3. The tree shelter according to claim 1, wherein a plurality of small holes are formed in the cylindrical body.

4. A tree shelter as described in claim 1, wherein the average total light transmittance, which is the average value of the total light transmittance measured at multiple measurement points on the cylindrical body, is 80 to 85%.

5. The tree shelter of claim 1, wherein the average vertical tear strength, which is the average value of the vertical tear strengths measured at multiple measurement points on the cylindrical body, is 630 to 1000 mN, and the average horizontal tear strength, which is the average value of the horizontal tear strengths measured at multiple measurement points on the cylindrical body, is 630 to 1000 mN.

6. The average surface resistivity, which is the average value of the surface resistivity values ​​measured at a plurality of measurement points on the cylindrical body, is 1.0×10 １０ 2. The tree shelter according to claim 1, wherein the resistance is Ω or less.

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