JP2002369630A - Weed-proofing sheet and method for applying weed- proofing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a weed-proofing sheet, excellent in weed-proofing effect, capable of readily carrying out waste disposal and being friendly to natural environment, and to provide a method for applying the weed-proofing sheet. SOLUTION: The weed-proofing sheet is obtained by laminating a fabric composed of a vegetable fiber such as palm fiber to a film composed of a biodegradable resin composition such as a polylactic acid or a biodegradable resin composition such as a polyolefin-based resin containing a light-degradable promoter by sewing, or the like, using a sewing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weed control sheet for preventing weeds from growing around vegetated trees, and a method for constructing the sheet.

[0002]

2. Description of the Related Art In recent years, greening of parks, gardens, residential lands, and the like has become active, and vegetation of trees has been active. If the trees grow sufficiently and the leaves grow, weeds will not grow near the roots, but it is necessary to prevent weeds from growing around the vegetated trees and impairing the aesthetics until the trees grow sufficiently. In order to prevent the overgrowth of weeds, weeds are manually removed, insecticides are sprayed, and straw is spread. However, these methods have the problem that the work is laborious and the effect is temporary, and the use of herbicides is harmful to the human body and vegetated plants.

As a method taking into account the continuity of the effect, there is a method of using a sheet having a high light-shielding property, such as a nonwoven fabric made of fiber, a vinyl sheet, and a tarpaulin coated with resin on a woven fabric. However, even when a nonwoven fabric is used, the seeds of the weeds in the soil around the vegetated trees do not germinate, but the seeds scattered by the wind etc. germinate, the roots are extended through the nonwoven fabric, and the weeds may prosper. . In addition, nonwoven fabrics are often made of synthetic fibers such as polyester, nylon, and polypropylene, and are not decomposed in the natural world, and vinyl sheets and tarpaulins are not similarly decomposed,
It is necessary to remove the sheet when the tree grows and becomes unnecessary, which is troublesome and has a problem in disposal.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides a weed-proofing sheet which is excellent in weed-proofing effect, is easy to dispose of, and is friendly to the natural environment. It is an object to provide

[0005]

The present invention solves the above-mentioned problems, and comprises a fabric comprising a vegetable fiber and a film comprising a biodegradable resin composition or a photodegradable resin composition. A grass sheet, characterized by
And the above-mentioned weed-proof sheet, wherein the plant fiber is palm fiber, and the above-mentioned weed-proof sheet is laid around a tree, and a method for constructing the weed-proof sheet, which is stopped with a stopper, and around the tree A grass comprising a biodegradable resin composition or a photodegradable resin composition, laying a vegetable fiber on the film, and stopping with a stopper. The gist is the construction method.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, the herbicidal sheet of the present invention is composed of two layers, one of which is composed of a cloth made of vegetable fibers. Here, vegetable fiber means
This fiber is produced by natural plants such as cotton, hemp, jute, and palm fiber, and is naturally degraded by sunlight or microorganisms after reaching its intended use. Used as an important component of the invention. These vegetable fibers are mainly composed of cellulose, but palm fibers and jute fibers containing lignin are highly resistant to microorganisms, are less likely to be decomposed by microorganisms, and have a longer service life than other plant fibers. Can be lengthened. It is said that the time required for decomposition when leaving cotton, hemp, etc. without lignin in the natural world is within one year, whereas palm containing about 40% lignin It is said that the fiber is 3 to 5 years, and the jute fiber containing about 20% is 1 to 2 years. By using these plant fibers in combination, it is possible to provide a herbicidal sheet that matches the period during which the herbicidal sheet should exhibit its effect from the growth of trees and the surrounding environment. In the case where a herbicidal sheet which exhibits an effect for a relatively long time until the tree has sufficiently grown and decomposes naturally is required, it is appropriate to use palm fiber.

In general, the fabric side is used as the surface side. In this case, it is preferable that the fiber is colored in a green system or a brown system in view of harmony with nature. Since sprout fibers are originally colored brown and are easily adapted to nature, sprout fibers are suitable for the herbicidal sheet of the present invention from this point.

In the present invention, the fabric is a woven fabric, a knitted fabric or a non-woven fabric made of the above-mentioned plant fiber. The fabric may be of any design. It is preferable to have

Another layer of the herbicidal sheet of the present invention is a film made of a biodegradable resin composition or a photodegradable resin composition. As the biodegradable resin composition, an aliphatic polyester is known and can be used in the present invention. Examples of the biodegradable aliphatic polyester include polybutylene succinate, polycaprolactone, and polylactic acid. The biodegradable resin composition does not need to be composed of a single biodegradable resin, and may be a mixture of a plurality of biodegradable resins. Among the above biodegradable resins, it is preferable to use polylactic acid as a main resin from the viewpoint of safety and heat resistance. Examples of the polylactic acid include poly-L-lactic acid whose structural unit is L-lactic acid, poly-D-lactic acid whose structural unit is D-lactic acid, and DL-lactic acid which is a copolymer of L-lactic acid and D-lactic acid. However, any of them may be used, or a mixture thereof may be used. In order to supplement properties such as flexibility and impact resistance of a film consisting of polylactic acid only,
It is preferable to form a film as a resin composition mixed with another aliphatic polyester or further mixed with a plasticizer.

The photodegradable resin composition includes general-purpose resins such as polyolefin resins, polyolefin-vinyl acetate copolymers, and polystyrene resins, as well as benzophenones, diphenyl ketones, anthraquinones, halogenated polyolefins, halogenated polystyrenes, and the like. A resin composition containing a decomposition accelerator is exemplified.

In the present invention, a film obtained by mixing the biodegradable resin composition and the photodegradable resin composition may be used. In any case, even if the resin composition used for the film is not completely decomposed by light or heat, it is degraded by primary decomposition due to light, heat, or hydrolysis, and finally, in soil or Preferably, it is completely degraded by microorganisms present in the water. Examples of such a resin composition include polylactic acid that is decomposed into carbon dioxide and water by microorganisms after primary decomposition by hydrolysis, and polyolefin-based resin that can be microbially degraded after primary decomposition by light. It is preferable to select a resin composition in which the period in which the primary decomposition proceeds is the same as the period in which the intended purpose is to be achieved, since the purpose most closely matches the object of the present invention.

The film comprising the biodegradable resin composition and the photodegradable resin composition used in the present invention is a film formed by a conventional method such as a T-die film forming method or an inflation film forming method. Good. The thickness of the film is not particularly limited, but is in the range of 5 to 100 μm.

The method of laminating a cloth comprising a vegetable fiber and a film comprising a biodegradable resin composition or a photodegradable resin composition according to the present invention includes a method of adhering a cloth and a film with an adhesive, And sewing around the periphery after cutting to the size to use each of the film and the film, sewing after sewing to the size to use each of the fabric and the film, sewing around the periphery and stitch sewing inside Method and the like. The method of sewing the inside with a stitch sewing machine is a preferable method because rain can be soaked into the soil through the needle hole of the sewing machine.

When the weed control sheet of the present invention is applied, for example, a cloth and a film made of vegetable fibers are cut into a shape as shown in FIG. 2 and sewn with a sewing machine, and as shown in FIG. Lay it around and stop with the stopper. The stopper used at this time is a so-called bamboo skewer made of bamboo, other wooden,
There are stoppers made of resin, metal and the like, but for the purpose of the present invention, natural materials such as bamboo and wood, and degradable materials such as biodegradable resins and photodegradable resins are preferable.

[0015] As a method for applying a weed control sheet capable of exhibiting the same herbicidal effect as when the above-mentioned weed control sheet is applied, a cloth made of the above-mentioned vegetable fiber and a biodegradable resin composition or photodegradable resin can be used. Method of cutting each of the films made of the conductive resin composition into the shape shown in FIG. 2, laying the film around a tree, laying a cloth made of vegetable fibers on top of the film, and stopping with a stopper There is. At this time, the above-mentioned stopper can be used as the stopper.

[0016]

According to the present invention, when a fabric composed of vegetable fibers and a film composed of a biodegradable resin composition or a photodegradable resin composition are laminated and used as a herbicidal sheet as in the present invention, the light-shielding properties of the fabric and the film are reduced. The seeds of weeds existing in the soil are not germinating and growing due to blocking properties, and even if the seeds of the scattered weeds germinate, their roots are blocked by the film and can not grow in the soil, so they can not grow . Therefore, weeds do not thrive. Another feature of the present invention is that the herbicidal sheet can be designed in accordance with the period in which the herbicidal sheet should exert its effect depending on the growth of trees and the surrounding environment. Further, since the material of the fabric and the film is composed of a substance which is completely decomposed in the natural world, there is no need to dispose the material after fulfilling the purpose of use. Further, the purpose of preventing the germination of the seeds of the scattered weeds can be achieved by merely covering the soil with the film, but the fiber fabric present on the surface as in the present invention further improves the appearance of the construction part. The film made of the biodegradable resin composition or photodegradable resin composition used in the present invention decomposes in a relatively short period of time, so select the type of plant fiber to be applied to the surface and the mixing ratio. By doing so, it is possible to design a weed prevention sheet that matches the period in which the effect is required.

[0017]

Next, the present invention will be described in detail with reference to examples. Example 1 A spun yarn made of palm fiber 200 tex twin yarn was used as a warp yarn, the warp density was 28/10 cm, and the weft density was 1
2/10 cm, weight per unit area at 1800 g / ^{m 2,} width 10
A 0 cm-thick woven fabric and a film having a thickness of 20 μm and a width of 100 cm made of a resin composition obtained by mixing polybutylene succinate with a polylactic acid as a main component are cut into lengths of 100 cm, respectively, and Center diameter 20
2 cm, and was cut into a shape shown in FIG.
These were overlapped, and the periphery thereof was sewn with a sewing machine and laminated to obtain a weed prevention sheet of the present invention. As shown in Fig. 3, the obtained weed control sheet was laid so as to cover the soil around the tree planted and stopped with a bamboo skewer, and no weeds flourished in the part covered with the sheet. Was.

[0018]

According to the present invention, there can be provided a herbicidal sheet in which weeds do not prosper due to the light-shielding property of the cloth and the blocking property of the film, and do not need to be disposed of.
It is possible to provide a herbicidal sheet suitable for a period in which an effect determined by the growth of a tree, the surrounding environment, and the like should be exhibited.

[Brief description of the drawings]

FIG. 1 is an example of a sectional view of a weed prevention sheet of the present invention.

FIG. 2 is an example of a plan view of the grass sheet of the present invention.

FIG. 3 is a view showing a construction example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weed-proof sheet 2 Vegetable fiber cloth 3 Film 4 Sewing part 5 Tree 6 Stopper

Claims (4)

[Claims] 1. A herbicidal sheet comprising a laminate of a vegetable fiber and a film of a biodegradable resin composition or a photodegradable resin composition. 2. The herbicidal sheet according to claim 1, wherein the vegetable fiber is palm fiber. 3. A method for constructing a weed prevention sheet, comprising laying the weed prevention sheet according to claim 1 around a tree and stopping with a stopper. 4. A film made of a biodegradable resin composition or a photodegradable resin composition is laid around a tree, and a cloth made of vegetable fibers is laid on the film.
A method for constructing a weed prevention sheet, characterized by being stopped with a stopper.