JP5674492B2 - Pest prevention biodegradable film for tree wrapping and method of using pest prevention biodegradable film for tree wrapping - Google Patents

Description

The present invention relates to a biodegradable film used for preventing damage of tree pests and a method for using a pest-preventing biodegradable film for winding trees.

  Conventionally, damage of tree death caused by various pests has been reported. For example, the pine wilt and pine wood nematode raise the problem of pine wilt. Specifically, when an adult pine wood beetle eats the bark of a pine, the pine wood nematode that lurked in the trachea of the pine wood beetle moved to the pine trunk and invaded into the pine tree However, it is known to parasitize and repeat breeding to wither trees.

  In recent years, there have been reports that oaks and oaks are frequently killed by filamentous fungi called Platypus quercivorus and oak fungus. The oak beetle cultivates and feeds on pathogenic bacteria called oak bacteria that it has made holes in oak and oak trunks. Oak fungus grows in the mine shaft where the wood beetle has penetrated, expands into the surrounding tree tissue, destroys the conduit, and kills the tree. The damage caused by the above-mentioned Platypus quercivorus and oak fungus is spreading nationwide, and the dead tree becomes red even in summer, which is also a problem on the landscape.

  In order to prevent the damage of trees by such pests, in order to prevent the damage from spreading, the damaged trees are cut and incinerated or the pests and parasitic fungi are extinguished by fumigation of the damaged trees (hereinafter referred to as “Prior Art 1”). For example, an invention of a fumigation coating sheet that is easy to handle has been proposed (Patent Document 1).

  In addition, as a different measure, a method of capturing or preventing infestation of pests and / or parasitic bacteria by applying an adhesive mixed with an insecticide to the trunk of a healthy tree or damaged tree (hereinafter referred to as “conventional”) (Also referred to as “Technology 2”) (for example, Non-Patent Document 1).

  However, although the prior art 1 is excellent in that it can eliminate pests and parasitic fungi, it requires labor-intensive work such as incineration and fumigation, and it is necessary to secure an incineration place and a fumigation place. There was a problem that had to be done. Similarly, the prior art 2 is also labor intensive and there is a risk that the use of the medicine will adversely affect the surrounding environment.

On the other hand, a method of winding a vinyl sheet around a tree (hereinafter also referred to as “Prior Art 3”) to prevent a pest from adhering to the tree is known (for example, Non-Patent Document 1). The prior art 3 has the advantage that it is not necessary to obtain a processing space as in the prior art 1, and that it is possible to protect the trees before they die. Further, unlike the prior art 2, there is no problem of adverse effects on the environment due to the drug.

JP 2003-147096 A

Forestry Agency, Japanese oak wilt damage, [online], Forestry Agency website, [Search December 17, 2010], Internet <URL: http://www.rinya.maff.go.jp/j/hogo/higai/naragare. html>

  However, in order to implement the prior art 3, since it is necessary to wind a sheet | seat around a standing tree, it may have to work in a high place or an inclined ground, and reduction of workability | operativity was desired. Specifically, in order to firmly wrap the vinyl sheet around the tree and fix it, the vinyl sheet is cut at an appropriate place and the cut end is attached with an adhesive tape or wound around the tree. Fixing work such as tying a rope to the trunk is necessary. Such cutting work is generally performed using scissors and knives. However, in order to reduce the risk in winding work as much as possible, the use of such cutting tools can be omitted. It is desirable to be. Further, as described above, the work of fixing the sheet to the tree has been a problem because it may be difficult particularly in a high place or an inclined place.

  Another problem is that if a vinyl sheet is wrapped around a tree without bending, the vinyl sheet may be partially broken by protrusions such as branches on the surface of the tree or irregularities on the bark. . Furthermore, since a general vinyl sheet is formed of a synthetic resin and remains in the environment if left untreated, it has to be collected after being wound for a certain period.

  The present invention has been made in view of the above problems, and specifically enables protection of trees before dying, is excellent in workability at the time of use, hardly breaks against protrusions, and further used. It is an object of the present invention to provide a pest-preventing film for winding a tree and a method for using the same, which can eliminate later artificial recovery.

The present invention
(1) Polybutylene adipate terephthalate is included as a constituent resin, the peel strength in self-bonding is 0.04 N / 2.5 cm or more, and the ratio of longitudinal tensile elongation to tensile elongation in the width direction (longitudinal tensile elongation (%) / Tensile elongation (%) in the width direction) is 0.3 or less, and the tensile elongation in the width direction is 500% or more. ,
(2) A pest-preventing biodegradable film for winding a tree according to the above (1), wherein 80% by weight or more and 100% by weight or less of the constituent resin is polybutylene adipate terephthalate,
(3) The tree trunk pest-preventing biodegradable film for winding a tree according to the above (1) or (2), wherein the longitudinal direction is the winding direction and a tree trunk and / or until a double or more overlapping portion is formed Alternatively, a method for using a pest-preventing biodegradable film for wrapping a tree, characterized in that the pest damage is prevented by wrapping from a root exposed on the ground surface to a trunk.
(4) In the above overlapping portion, the biodegradable film is fixed to the tree by adhering the films to each other by the self-adhesiveness of the film. How to use biodegradable film,
Is a summary.

  The pest-preventing biodegradable film for winding a tree according to the present invention is a biodegradable film containing polybutylene adipate terephthalate, and can be manually recovered after being used outdoors for a certain period.

  Moreover, since the present invention is a biodegradable resin as a constituent resin and includes polybutylene adipate terephthalate that easily exhibits self-adhesiveness, the peel strength specified by the present invention can be realized. If it is a film provided with the peeling strength specified in the present invention, good self-adhesiveness can be exhibited even on a tree surface having irregular irregularities on the surface. Therefore, the pest-preventing biodegradable film for wrapping a tree of the present invention is wound around a tree at least until the film overlaps twice to provide an overlapping portion of the film, and exhibit self-adhesiveness in the overlapping portion. Can be fixed to trees. Therefore, in order to fix the film wound around the tree, it is possible to affix the winding end portion with an adhesive tape or the like, or to fix the film wound around the tree with a rope.

  In addition, the ratio of the tensile elongation in the longitudinal direction to the tensile elongation in the width direction of the film (longitudinal tensile elongation (%) / tensile elongation in the width direction (%)) is 0.3 or less, and By specifying that the tensile elongation in the width direction is 500% or more, it is excellent in hand cutting in the width direction and is torn even when there are protrusions on the surface of the tree that is the winding surface. A difficult film can be provided.

  In addition, the method of using the biodegradable film for preventing insect pests for winding a tree according to the present invention provides a new method of using the biodegradable film, omitting the collection work, and facilitating the fixing work by self-adhesiveness. And at the same time, the two contradictory effects of the film's hand cutting property and difficulty in tearing are realized. According to the method of using the pest-preventing biodegradable film for winding a tree, the workability of covering the surface of the tree with the film is greatly improved. As a result, it is possible to desirably prevent the pest from adhering to the tree.

1A and 1B are explanatory views for explaining a method of winding the film of the present invention around a tree surface.

Hereinafter, the pest-preventing biodegradable film for winding a tree of the present invention (hereinafter also simply referred to as “the film of the present invention”) will be described in detail. In the present invention, the film is a resin molded body in which a length that can provide at least a double overlapping portion in the winding direction is secured in the longitudinal direction when wound around a tree trunk. Often includes resin moldings indicated by other names such as sheets, membranes, thin films and the like. In the present invention, the longitudinal direction of the film means the winding direction at the time of film formation, or the stretched direction of the molded body at the time of molding indicated by the extrusion direction or the like, while the width direction of the film means the longitudinal direction. On the other hand, it means a substantially vertical direction. Even if the film of the present invention is not in the state of being wound on a roll but in the form of a folded sheet or a sheet cut to a specified size, the film of the present invention has a longitudinal direction and a width. Directions are understood in the above definition. However, if the direction in which the molded body is stretched during film formation is unknown depending on the form at the time of use, the direction of winding around the tree and the planned direction are understood as the longitudinal direction of the film, while the width direction is approximately It may be understood as a vertical direction.
In the present invention, “the peel strength by self-bonding is 0.04 N / 2.5 cm or more” means that the peel strength between films having no adhesive layer or the like is 0.04 N / 2.5 cm or more. means. In the present invention, a film showing the range of peel strength by self-bonding is referred to as a film having self-adhesiveness.

  The film of the present invention contains polybutylene adipate terephthalate (hereinafter also referred to as “PBAT”) as a constituent resin. In order to enable the present inventor to protect the trees before withering from pests, the biodegradable film is wound around the trunk of the tree or from the root to the trunk. It was noted that there was no need for recovery. The biodegradable film has been used outdoors in various forms due to the property of being biodegraded in a natural environment, but the mode of use of wrapping around a tree has not been known. Moreover, the present inventor selects a biodegradable film that contains PBAT as the main constituent resin, and uses the self-adhesiveness of PBAT to fix the film to the tree when it is wrapped around the tree. At that time, it was found that a sufficient fixing of the wound state can be realized only by superimposing the films, or by superposing and lightly restraining them from the upper surface without requiring a fixing member such as an adhesive tape or a rope. In the present invention, the term “main constituent resin” is intended to indicate 50% by weight or more out of 100% by weight of the resin constituting the film.

  More specifically, from the viewpoint of biodegradability, when the total amount of the constituent resin of the film is 100% by weight, PBAT is contained in a proportion of 50% by weight or more and less than 100% by weight, and one or more other resins You may form the film of this invention by mixing with. The blending amount of PBAT and the types of other resins to be combined are determined according to the environment in which the film of the present invention is used, the expected period of use (ie, the period during which it is desired to maintain the state wrapped around the tree), and the like. It may be determined appropriately from the biodegradable speed to be obtained. For example, when better biodegradability is required, polylactic acid (PLA), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polycaprolactone (PCL), etc. The resin of the present invention can be mixed with PBAT to form the film of the present invention. Alternatively, PBAT may be substantially 100% by weight as the constituent resin of the film of the present invention.

  Furthermore, the blending amount of PBAT in the film of the present invention is determined in consideration of the self-adhesiveness of the film. That is, the film of the present invention is specified to have a peel strength of 0.04 N / 2.5 cm or more in self-bonding. If the film shows such a range of peel strength, just wrap the film around the trunk of a tree whose surface is irregularly uneven until at least a double overlapping part is formed, or in the overlapping part By simply pressing the surface of the film in the direction of the tree by hand, the films can be bonded together with self-adhesive strength. In addition, the upper limit of the peel strength in self-bonding is preferably about 0.2 N / 2.5 cm in consideration of the film releasability and winding workability.

  In the case where the self-adhesiveness in the above-described range is exhibited depending only on the properties of PBAT, the blending amount of PBAT in the present invention is 80% by weight or more, preferably 90% by weight or more, more preferably 100% by weight. is there. However, in order to exhibit the above-mentioned range of self-adhesiveness in the film of the present invention, the amount of PBAT may be made less than 80% by adding a tackifier or a plasticizer additive to the film. Is possible.

  Specifically, the peel strength in self-bonding of the film of the present invention can be measured according to JIS Z0237 “Testing method for adhesive tape and adhesive sheet”. Specifically, a 3.0 cm × 30 cm film is prepared and fixed to a horizontal plane to form a support. On the other hand, the same film as the above film is used, and a test piece is prepared by cutting the film in a width direction length of 2.5 cm and a length direction length of 30 cm. Next, 1.0 cm of one end of the test piece is left as a gripping portion, and the test piece is attached to the approximate center of the support with a manual rubber roller. Then, the grip strength of the self-bonding is measured by measuring the force (N) required when the grip portion is sandwiched between grip tools of a peel tester and peeled at a peel speed of 300 mm / min and a peel angle of 180 degrees. can do.

  The PBAT used in the present invention is an aromatic aliphatic polyester and may be a polycondensate of a dicarboxylic acid component composed of adipic acid and terephthalic acid and a diol component composed of 1,4-butanediol. In addition to what is called polybutylene adipate terephthalate, polycondensates such as poly (butylene adipate / terephthalate), poly (tetramethylene adipate / terephthalate), poly (butylene adipate co-terephthalate), and the like are also used as the polybutylene adipate terephthalate of the present invention. Can be used as

  In addition to the constituent resin containing PBAT, the film of the present invention may contain other additives as needed. Examples of additives include, for example, tackifiers, plasticizers, heat stabilizers, light stabilizers, ultraviolet absorbers, lubricants, pigments, inorganic fillers, organic fillers, flame retardants, antistatic agents, and antifogging agents. And so on. The addition amount of these additives is not particularly limited, and can be determined as appropriate without departing from the spirit of the present invention.

  Next, the tensile elongation of the film of the present invention will be described. In the film of the present invention, the ratio of the tensile elongation in the longitudinal direction to the tensile elongation in the width direction (longitudinal tensile elongation (%) / tensile elongation in the width direction (%)) is 0.3 or less, and the width direction Is specified to be 500% or more. By adopting such a configuration, by adjusting the tensile elongation in the longitudinal direction and the width direction of the film to a specific range, it is possible to solve two problems of hand cutting and difficulty in tearing. That is, by setting the ratio of the tensile elongation between the winding direction of the tree (that is, the longitudinal direction of the film) and the direction substantially perpendicular to the winding direction (that is, the width direction of the film) to a specific range, It is possible to realize a film with excellent hand cutting properties, and in addition, within the above preferred ratio range, by ensuring a certain amount of tensile elongation in the width direction of the film, it is possible to prevent damage to the film against protrusions. It is something that can be done. In addition, this inventor considers as follows about the relationship between the ratio of tensile elongation, and hand tearability. Now, the film is roughly divided into two directions, ie, the longitudinal direction and the width direction, and the tensile elongation values in the longitudinal direction and the width direction are different. A force (hereinafter also referred to as “tear force”) is applied so as to tear the film in any direction. At this time, if the film cut surface to which the tearing force is applied is microscopically taken, the tearing force is applied in both the longitudinal direction and the width direction, and when the elongation in either direction reaches the limit due to the tearing force, Since the tearing force is directed in the other direction where there is still room for extension, it was considered that the tearing occurred in the direction of larger tensile elongation as a result.

The tensile elongation shown in the present invention can be measured according to JIS K7113 "Plastic tensile test method". Specifically, a No. 1 type test piece with a distance between marked lines of 50 mm and a medium length of 10 mm is prepared, and pulled under a test environment temperature of 23 ± 2 ° C. at a pulling speed of 200 mm / min until the test piece breaks. From the distance L between marked lines at the time of breakage with respect to the length L ₀ before pulling (that is, distance between marked lines = 50 mm), the tensile elongation is calculated by the following formula 1.
(Formula 1) Tensile elongation (%) = (L−L ₀ ) / L ₀ × 100

  In the tensile elongation measurement test, the tensile elongation in the longitudinal direction and the width direction of the film is measured. Then, the ratio of the tensile elongation in the longitudinal direction to the tensile elongation in the width direction (longitudinal tensile elongation (%) / tensile elongation in the width direction (%)) is calculated, and the film is adjusted so that this ratio is 0.3 or less. By producing the film, it is possible to provide a film having good hand cutting properties in the width direction. Therefore, after winding the film as the winding direction of the tree as the longitudinal direction of the film, and cutting the film in the width direction by hand without using a cutting tool such as scissors, the cut is wound in the winding direction (i.e. It is difficult to run in the longitudinal direction), and the film can be cut well in the width direction.

  Moreover, it is specified that the film of the present invention has a tensile elongation in the film width direction of 500% or more, particularly within the above range. This ensures the flexibility (easiness of elongation) of the film, and can provide a film that is not easily torn even by unevenness of branches or bark on the surface of the tree when wound around the tree.

  Therefore, as described above, the film according to the present invention has the ratio of the tensile elongation in the longitudinal direction to the tensile elongation in the width direction and the range of the tensile elongation in the width direction. It is necessary to adjust to satisfy the two ranges. Below, the manufacturing method for implement | achieving the tensile elongation of the desirable longitudinal direction and the width direction of the film of this invention is demonstrated.

  The production method of the film of the present invention is not particularly limited, and can be carried out by appropriately selecting a known production method without departing from the spirit of the present invention. For example, conventionally known methods such as an inflation method, a T-die extrusion method, and a calendar method can be exemplified, but the method is not limited thereto.

  More specifically, the production of the present invention will be described by taking the inflation method as an example. The inflation method is a method in which a die having an annular die (die) is attached to the tip of an inflation molding machine that is an extruder, and a heat-melted resin material is extruded into a cylindrical shape to continuously form a film. The film extruded in a cylindrical shape is stretched by being pulled in the extrusion direction, and is spread in the width direction by blowing air into the cylinder, and is wound after being cooled. In the general inflation method, the extruded cylindrical film is sandwiched between two pinch rolls, and at this time, the two sides of the film are cut and peeled to form two films. Alternatively, one side piece can be cut and opened to be used as a single film. However, since the film of the present invention is excellent in self-adhesiveness, it may be used as a film having a two-layer structure by winding it as a two-layer film without cutting both side pieces. That is, the film of the present invention is self-adhesive well, and is superimposed by a pinch roll immediately after molding, so that it becomes close to welding due to latent heat, and there is no possibility of peeling into two layers after becoming a product, as if it is further It feels like a film. According to this production mode, for example, when the thickness of the film of the present invention is set to 0.05 mm, the molding thickness of the film at the time of inflation production may be set to 0.025 mm. It is easier to increase the stretch ratio in the longitudinal direction by molding with a thickness that is half the predetermined thickness than when the desired thickness is obtained with one molded film (one layer). Easy to get.

  In the above-described inflation method, when the film is produced with the stretch ratio in the longitudinal direction being 40 times or more and / or the blow ratio for expanding the width direction being 3 or less, the width direction specified in the present invention It is easy to obtain the ratio of the tensile elongation in the longitudinal direction to the tensile elongation of and the range of tensile elongation in the width direction. However, when the constituent resin of the film is 100% by weight of PBAT and less than 100% by weight of PBAT, and when the film is formed by mixing any resin in an arbitrary ratio, the same tensile elongation is obtained. However, it is desirable to pay attention to this point because the stretch ratio and the blow ratio at the time of inflation molding may be different.

The thickness of the film of this invention is not specifically limited, It can determine suitably. Also, there is no particular limitation on whether the formed film is used in one layer or in two or more layers. For example, the film of the present invention can be carried out with a thickness of 0.005 mm to 0.1 mm, preferably 0.01 mm to 0.05 mm, and more preferably 0.01 to 0.03 mm. In addition, the thickness of the film of this invention mentioned above means the thickness after multilayer lamination, when a molded film is laminated | stacked on two or more layers. By making the thickness of the film of the present invention 0.005 mm or more, film forming can be facilitated, and the films can be prevented from being inadequately handled due to electrostatic force or self-adhesive force, and the handling property can be improved. . Moreover, the film of this invention is very good in the hand cutting property of a film by making thickness into 0.1 mm or less.

  Below, the usage method as a pest damage prevention film of a tree using the film of this invention mentioned above is demonstrated. 1 (A) and 1 (B) are explanatory views for explaining a method of using the film of the present invention, in which pest damage is prevented by winding the film of the present invention around a tree trunk. The film of the present invention can be used by being wound around a trunk in order to prevent pests from adhering to the trunk surface and damaging trees. As an example of the winding method, as shown in FIG. 1A, the film 1 of the present invention is applied to the trunk surface of the tree 10 with respect to the extending direction of the tree trunk until a double overlapping portion 2 is formed. It can be carried out by covering the trunk surface of the tree by winding it in a substantially vertical direction. In FIG. 1A, the overlapping portion shows a double aspect, but the overlapping portion may be wound in multiple layers so that the overlapping portion is triple or more.

Since the film 1 of the present invention is excellent in self-adhesiveness, by providing the overlapping portion 2, the films 1 are bonded to each other, whereby the film 1 is fixed in a state of being wound around the tree 10. In order to adhere the films 1 more reliably, the overlapping portion 2 may be lightly pressed by hand in the direction of the tree.

  When the film 1 is wound around the tree 10, the winding start point may be pressed to fit along the trunk surface without bending, or may be wound with a slight tension in the winding direction. At this time, although the tension on the film surface is increased, the film is formed even if the trunk surface has protrusions 5 such as branches and skins because the film is formed with flexibility such that the tensile elongation in the width direction of the film is 500% or more. Because it extends mainly in the width direction, it is difficult to break.

  After winding the film 1 until the overlapping portion 2 is formed, the film 1 can be cut by hand in the width direction to form the cut portion 6. Since the ratio of the tensile elongation in the longitudinal direction and the width direction of the film 1 is in a desirable range specified by the present invention, the cut portion 6 is cut in the winding direction of the film 1, that is, in the longitudinal direction of the film 1. Is difficult to run and can be easily cut in the width direction.

  In addition, the place which winds the film 1 around the tree 10 is arbitrary. Although not shown, the base 4 may be covered and wound. It may be wrapped around the entire trunk of the tree 10, but depending on the target pests, there are things that adhere only to the trunk surface up to a height of about 2m from the ground. May be determined as appropriate.

  Moreover, as shown in FIG. 1 (B), as another aspect of the method of winding the film 1 of the present invention, the film 1 may be wound spirally while forming overlapping portions. In the method of use of the present invention, the winding method may be determined in consideration of the thickness of the tree 10, the size in the width direction of the film 1, and the like, and is not limited to the winding method of FIGS. 1 (A) and (B). . Since the film 1 of the present invention is excellent in self-adhesiveness, an adhesive portion between the films 1 is formed while being wound by winding in a spiral shape while forming the overlapping portion 3 as shown in FIG. The winding state is stable and can be easily fixed to the tree 10. Although not shown, as shown in FIG. 1B, the film 1 is spirally wound around the trunk of the tree 10, and separately, the film 1 is covered while being wrapped around the tree 10 so as to cover the root 4. Also good.

  A film was prepared by an inflation molding machine to which a circular die having a diameter of 10 cm was attached using a film raw material composed of a resin composition and additives shown in Table 1. However, the film used as Comparative Example 5 was a commercially available film. Table 1 also shows the stretching ratio, blow ratio, and film thickness in the extrusion direction as molding conditions. In Example 1, Example 2, Example 3, Example 4, Comparative Example 2, Comparative Example 3, and Comparative Example 4, two cylindrical films formed by the above-described inflation molding machine are stacked with a pinch roll. It was set as the state. On the other hand, in Example 5 and Comparative Example 1, the film was stretched and cooled while being drawn in the extrusion direction, and cut into the extrusion direction with a cutting blade to obtain a single film.

  For Examples 1 to 5 and Comparative Examples 1 to 5 obtained above, the tensile elongation in the longitudinal direction and width direction of the film was measured according to JIS K7113 as described above. The ratio of the tensile elongation in the longitudinal direction to the tensile elongation in the width direction was calculated as described above and is shown in Table 1. In the table, (* 1) to (* 4) are as follows.

(* 1) PBAT: Ecoflex (manufactured by BASF)
(* 2) PBSA: Bionore # 3001 (Showa Denko)
(* 3) Vinylidene chloride: NEW Kurewrap (Kureha wrap film)
(* 4) Calculated by longitudinal tensile elongation (%) / width tensile elongation (%).

  About Examples 1-5 obtained above and Comparative Examples 1-5, the adhesive force in self-bonding was measured according to JIS Z0237 as described above. The results are shown in Table 1.

  In order to confirm the hand cutting property in the width direction of the film, from Examples 1 to 5, Comparative Examples 1 to 4 and Comparative Example 5 obtained above, from one end in the width direction at an appropriate position. I made a cut with my hand and just torn it. A that shows good hand cutting performance in the width direction without running a cut in the longitudinal direction is A, and B that has a cut in the longitudinal direction and poor hand cutting performance in the width direction has substantially no elongation. For this reason, C was evaluated as a material that easily splits in either the longitudinal direction or the width direction.

  In order to confirm the difficulty of tearing the film, in Examples 1-5, Comparative Examples 1-4, and Comparative Example 5 obtained above, the film was pierced with a sharpened HB pencil at an appropriate position. The ease of opening a hole was evaluated. Those that could not be easily pierced were evaluated as “good”, and those that could be easily pierced were evaluated as “poor”.

DESCRIPTION OF SYMBOLS 1 Film 2, 3 Overlapping part 4 Root 5 Protrusion 6 Cutting part 10 Tree

Claims (4)

It contains polybutylene adipate terephthalate as a constituent resin, has a peel strength of 0.04 N / 2.5 cm or more in self-bonding, and a ratio of longitudinal tensile elongation to tensile elongation in the width direction (longitudinal tensile elongation (%)) A pest-preventing biodegradable film for winding a tree, wherein the tensile elongation (% in the width direction) is 0.3 or less and the tensile elongation in the width direction is 500% or more. The insect-preventing biodegradable film for winding a tree according to claim 1, wherein 80 to 100% by weight of the constituent resin is polybutylene adipate terephthalate. The roots exposed to the trunk and / or the ground surface of the pest-preventing biodegradable film for winding a tree according to claim 1 or 2 with a longitudinal direction as a winding direction until a double or more overlapping portion is formed. A method for using a pest-preventing biodegradable film for wrapping a tree, characterized by preventing damage to the pest of a tree by wrapping it from a trunk to a trunk. The insect-degrading biodegradable film for winding a tree according to claim 3, wherein the biodegradable film is fixed to the tree by bonding the films to each other by the self-adhesiveness of the film in the overlapping portion. How to use.

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