JPH1132594A - String for agriculture and horticulture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a string for agriculture and horticulture, capable of preventing its loosing and improved in strength, handleability and environmental pollution resistance by producing the string from a biodegradable string body and a biodegradable synthetic resin coated on the outer periphery of the string body. SOLUTION: This string 1 comprises a biodegradable string body 2 produced from either one or both of paper and natural fibers and a biodegradable coating layer 3 comprising a synthetic resin such as polyvinyl alcohol. The thickness of the coating layer is preferably 5-500 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to agriculture, horticulture or forestry, such as for inviting fruit tree branches, attaching crops, cultivating root mortars, and attaching to tree posts. It is related to a string for agricultural and horticultural use.

[0002]

2. Description of the Related Art A string for agricultural and horticultural use disclosed in Japanese Utility Model Application Laid-Open No. 6-61053 is known. The string for agricultural and horticultural use is formed by impregnating a string made from natural fibers with an organic acid copper such as a carboxylic acid or a sulfonic acid. The string is impregnated with an aqueous sizing agent such as an acrylic or vinyl acetate, thereby improving the strength of the string.

[0003] When such a string is used, bacteria that decompose natural fibers are sterilized by the sterilizing performance of the organic acid copper and the life of the string is extended, so that the string is deteriorated for a long period of time (for example, during the agricultural period). Is described as being possible.

[0004]

By the way, in a string impregnated with the above-mentioned organic acid copper, the organic acid copper impregnated during rainfall dissolves in rainwater, and the rainwater containing this organic acid copper is contained in the string. The organic acid copper accumulates in the soil by falling. Although organic acid copper is said to be less toxic to the human body, it is still undesirable for metal compounds to accumulate in agricultural and horticultural soils.

[0005] The present invention has been made to solve the above-mentioned problems, and it is possible to reliably suppress the disassembly of a string during use and without using a drug at all, and to use it after use. It is an object of the present invention to provide an agricultural and horticultural string that can be biodegraded and thereby reliably prevent environmental pollution.

[0006]

The string for agricultural and horticultural purposes according to claim 1 of the present invention comprises a string having biodegradability and a coating layer made of a synthetic resin coated on the outer peripheral surface of the string. It is characterized by comprising.

According to this string for agricultural and horticultural use, since the outer peripheral surface of the string is coated with a synthetic resin, the string is protected by the coating layer.
As a result, it will be able to withstand long-term use, and the strength of the string for agricultural and horticultural use will be improved and it will be strong
Agricultural and horticultural work using the string for agricultural and horticultural use is facilitated, such as fraying of the string is reliably prevented, and rough hands and abrasions can be prevented.

Further, by adopting a transparent synthetic resin for the coating layer, when the cord body is made of, for example, natural fibers, it is possible to leave the texture of the natural fibers by forming the coating layer. Yes, agricultural and horticultural strings match the natural environment.

Furthermore, since the synthetic resin coated with the string has biodegradability, even if the used agricultural and horticultural string is discarded as it is in a field or the like, the string and the coating layer of the coating are not removed. Since both are decomposed by bacteria, it is not necessary to collect all of the agricultural and horticultural strings, and the efficiency of the agricultural and horticultural work is realized.

[0010] The string for agricultural and horticultural use according to claim 2 of the present invention is the string for agricultural and horticultural use according to claim 1, wherein the string is made of one or both of paper and natural fiber. It is characterized by being.

According to the agricultural and horticultural string, paper and natural fibers are abundant and inexpensive, which contributes to a reduction in the manufacturing cost of the agricultural and horticultural string.

According to a third aspect of the present invention, there is provided the string for agricultural and horticultural use according to the first or second aspect, wherein the coating layer has a thickness of 5 μm to 500 μm. Is what you do.

According to this string for agricultural and horticultural use, if the thickness is less than 5 μm, the disadvantage that the coating layer is too thin to be able to reliably protect the string body is avoided. Is too thick, it is difficult to freely bend the agricultural and horticultural strings, and the inconvenience of not being able to easily perform agricultural and horticultural work such as binding fruit tree branches for attraction is avoided. Thus, the efficiency of the agricultural and horticultural work is achieved.

The thickness of the coating layer may be in the range of 5 μm to 500 μm, especially 100 μm to 2 μm.
00 μm is preferred. The reason is that if it is within this range, the coating function for the cord can be sufficiently maintained for at least one time span (for example, six months) of agricultural and horticultural work, and the binding operation and the like can be performed. This is because it can be performed easily and reliably.

[0015]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an agricultural and horticultural cord according to the present invention, and FIG. 2 is a sectional view thereof. As shown in these figures, an agricultural and horticultural cord 1 is provided with a biodegradable cord 2 and a biodegradable coating layer 3 coated on the outer peripheral surface of the cord 2. Have been.

In the present embodiment, a so-called hemp string obtained by spinning a filament of jute (burlap), which is a natural fiber, and twisting the same is used as the string body 2. The reason why such a jute is adopted as the cord body 2 is that the jute is most suitable as an attraction string for fruit trees for the following reasons. That is, jute has an elongation of 1.3.
１1.4%, which is the lowest among the natural fibers, and the tensile strength is as large as 41 to 44 kg / mm. Therefore, there is no inconvenience such as having to re-wrap by stretching in the attracted state. , Filament is 6 ~
Since it is 26 μm, which is thinner than other natural fibers, the cord body 2 obtained by twisting this filament becomes bulky, so that the contact state with the growing tree becomes soft, and the tree is not damaged. This is because it has many advantages.

The string 2 having biodegradability used in the present invention is not limited to the above-mentioned jute, but is made of other hemp (hemp, ramie, flax, manila hemp). Or may be made of cotton. Further, it may be made of wool, or may be made of so-called human silk manufactured using artificial fibers by the cupra method as a raw material.

A string 2 having a diameter of 3 mm to 9 mm is formed by twisting such a natural fiber or a biodegradable synthetic fiber. The reason why the thickness of the cord 2 is set within the range of 3 mm to 9 mm in diameter is that if the diameter is smaller than 3 mm, a predetermined tensile strength cannot be obtained, and the cord 2 can be used as an attraction string for fruit trees. Because it will not be possible
On the other hand, if the diameter is larger than 9 mm, it becomes heavy and handling becomes difficult, and it becomes difficult to perform agricultural and horticultural work.

In the present embodiment, a coating layer 3 made of a synthetic resin having biodegradability is laminated on the outer peripheral surface of the cord body 2 as described above, and the string 1 for agricultural and horticultural use according to the present invention is provided.
Are formed.

The biodegradable synthetic resin includes:
Natural materials may be used as main raw materials, or artificial synthetic products (biodegradable synthetic plastics) may be used. Examples of biodegradable synthetic resins using natural materials as main raw materials include starch-based plastics, cellulose-based plastics, wood-based plastics, chitin / chitosan-based plastics, protein-based plastics, and natural rubber-based plastics. Examples of the biodegradable synthetic plastic include biodegradable polyester, polyether, polyvinyl alcohol, and polymalic acid.

In the present embodiment, polyvinyl alcohol is applied as a biodegradable synthetic resin, and the coating layer 3 is formed by coating the outer peripheral surface of the string body 2 with the polyvinyl alcohol. Gardening String 1 is ready.

FIG. 3 is a process diagram showing an embodiment of a manufacturing process for manufacturing the agricultural and horticultural cord 1 according to the present invention.
As shown in this figure, the manufacturing process for manufacturing the agricultural and horticultural cord 1 includes a spinning process P1 in which the raw material jute 21 is spun and twisted.
A coating process P2 in which polyvinyl alcohol 31 which is a biodegradable synthetic resin is laminated and coated on the outer peripheral surface of the cord body 2 obtained in the spinning process P1, and a product immediately after coating obtained in the coating process P2 And a drying step P3 for drying P11.

In the spinning step P1, a spinning device and a twisting device (not shown) are provided, and the raw material jute 21 is subjected to a predetermined spinning process and a twisting process by these devices to form a cord 2 having a predetermined thickness. And sent to the coating process P2.

In the coating step P2, a dissolving tank (not shown) and a cord feeding mechanism for continuously feeding and pulling the cord 2 into the dissolving tank are provided. The above-mentioned dissolving tank is loaded with an aqueous solution of polyvinyl alcohol having a predetermined concentration, and the cord 2 derived from the spinning process P1 is
It is supplied to this dissolving tank by the driving of the cord feeding mechanism and is immersed in the aqueous solution, whereby a coating layer of polyvinyl alcohol is formed on the outer peripheral surface of the cord 2, and the article 11 immediately after coating is obtained. .

In the drying step P3, an elongated drying chamber (not shown) is provided. This drying chamber is a kind of a so-called drying furnace, and is set so that the ambient temperature in the chamber becomes approximately 100 ° C. by electric heating or the like. The product 11 immediately after coating obtained in the coating step P2 travels inside the drying chamber while being stretched horizontally in the traveling direction by driving a winding device provided on the exit side of the drying chamber. The string 1 for agriculture and horticulture is obtained by being sequentially dried in the progressing process.

In the above embodiment of the manufacturing process, the cord 2 is immersed in an aqueous solution of a biodegradable resin in the coating step P2 to form the coating layer 3 on the outer peripheral surface of the cord 2. When the biodegradable resin is a thermoplastic resin (for example, aliphatic polyester such as poly-ε-caprolactone, polybutylene succinate, poly-β-hydroxyalkanoate, etc.), the immersion as described above is performed. An extrusion molding method can be applied instead of the method.

When the extrusion molding method is applied, a known extrusion molding machine for covering electric wires and the like is used. This extrusion molding machine is basically composed of a cylindrical casing, a screw conveyor provided in the casing, a raw material hopper for supplying a resin raw material to the screw conveyor, and a die mounted on a downstream end of the casing. I have.
Heating means such as electric heating is buried in the casing to melt the resin raw material supplied from the raw material hopper. In addition, an insertion hole through which the cord body 2 passes is formed in the shaft center of the screw conveyor over the entire length. On the other hand, the die is provided with an extrusion hole concentric with the insertion hole, and the molten resin pressed and transferred by the screw conveyor is pushed out from the extrusion hole to the outside. The resin material from the raw material hopper is sequentially loaded into the casing while the cord body 2 is passed through the insertion hole from the base end side of the screw conveyor of the molding machine, pulled out from the extrusion hole of the die, and wound on a predetermined winding drum. Then, the resin raw material charged in the casing is heated and melted by the heating means, is pressed and transferred in the direction of the die by the rotation of the screw conveyor, and is extruded from the extrusion hole. At this time, the outer peripheral surface of the cord body 2 pulled out from the extrusion hole is covered with the molten resin, whereby the agricultural and horticultural cord 1 coated with the biodegradable synthetic resin is obtained.

The string for agricultural and horticultural use 1 thus obtained is
It is cooled through a cooling step of passing cooling water in a cooling water tank provided in place of the drying step P3, and is sequentially wound on a winding drum to be commercialized.

According to this extrusion molding method, it is possible to coat the cord 2 even if it is a resin having thermoplasticity, even if it is a biodegradable synthetic resin that is insoluble or hardly soluble in water. Accordingly, the applicable range of the biodegradable synthetic resin used for the string 1 for agriculture and horticulture can be expanded.
Further, by appropriately selecting the diameter of the extrusion holes, the thickness of the coating layer can be easily set to an arbitrary thickness, which is effective in easily and appropriately performing quality control. Further, since the time-consuming drying step P3 is not required, the manufacturing time can be reduced, and the productivity can be improved.

In each of the above embodiments, the thickness of the coating layer 3 (FIGS. 1 and 2) is 5 μm to 500 μm.
I am trying to be. Then, in order to make the coating layer 3 have such a thickness, in the case of the dipping method, the concentration of polyvinyl alcohol in the aqueous solution and the dipping time of the cord body 2 in the aqueous solution are controlled. In the case of the extrusion molding method, the diameter of the extrusion hole is appropriately set.

The thickness of the coating layer 3 is 5 μm to 5 μm.
The reason why the thickness is set to 00 μm is that if the thickness is less than 5 μm, the coating layer 3 is too thin and the string body 2 cannot be reliably protected. If the thickness exceeds 500 μm, the coating layer 3 becomes too thick. This makes it difficult to bend the agricultural and horticultural strings 1 freely,
This is because agricultural and horticultural work such as binding fruit tree branches for attraction cannot be easily performed.

The thickness of the coating layer 3 may be in the range of 5 μm to 500 μm, and more preferably, in the range of 100 μm to 500 μm.
200 μm is preferred. The reason is that within this range, at least one time span of agriculture and horticulture (for example, 6
During this period, the coating function for the cord body 2 can be sufficiently maintained, and the binding operation and the like can be performed easily and reliably.

As described above in detail, the string 1 for agricultural and horticultural use of the present embodiment is formed by coating the outer peripheral surface of the string 2 having biodegradability with the coating layer 3 formed of a synthetic resin having biodegradability. As a result, the surface becomes smooth and the appearance becomes beautiful with the texture of the cord body 2 left. Since the cord body 2 is protected by the coating layer 3 and fraying of the fiber is reliably prevented, there is a case where an operation of binding the agricultural and horticultural string 1 to a branch of a fruit tree is performed upward. In addition, not only does the inconvenience that the fiber fray falls and enters the eyes does not occur, but the surface is smooth,
Touching the agricultural / horticultural string 1 can surely prevent inconvenience such as rough hands and scratches.

In addition, the cord itself usually has a high elongation and stretches well when pulled, so that it is difficult to obtain a reliable binding effect. However, in the string 1 for agriculture and horticulture of the present invention, the cord is used. Since the coating layer 3 made of a synthetic resin is formed on the outer peripheral surface of the body 2, the elongation of the string 1 for agricultural and horticultural use is reduced,
As a result, a secure binding state can be obtained.

Further, since the string 2 is covered with the coating layer 3, the absorption of moisture into the string 2 is prevented, and the propagation of various bacteria in the string 2 due to the moisture is prevented. be able to. Further, since the penetration of the pesticide into the cord body 2 is prevented, even if the agricultural and horticultural string 1 comes into contact with the fruit, discoloration and contamination of the contact portion by the pesticide and the like are effectively prevented.

Further, since the cord body 2 is protected by the coating layer 3, the cord body 2 does not fall apart due to contact with wind, rain, branches, or the like, and is excellent in shape retention.

In addition, since the string 1 for agricultural and horticultural use is formed of a biodegradable polymer substance in both the string body 2 and the coating layer 3, even if the string 1 is discarded on the ground after use, the string 1 The agricultural and horticultural cord 1 is not decomposed by the bacteria therein, so that the original form is not retained, and it is not necessary to perform the troublesome work of collecting and collecting the remnants of the agricultural and horticultural cord 1, and the efficiency of the agricultural and horticultural work is accordingly increased. Is realized.

Therefore, if the ordinary synthetic resin agricultural and horticultural cord is discarded after being used, it is left on the soil or in the soil for a long time, and this residual cord is used by a cultivator or the like at the time of tillage or undercutting. Problems such as entanglement or hooking with the working machine occur, but such inconvenience does not occur in the agricultural / horticultural string 1 of the present invention. Therefore, the string for agricultural and horticultural use 1 can be discarded on the spot after use, which is extremely effective in improving work efficiency and work safety.

In the above embodiment, a cord obtained by spinning and twisting various fiber materials is adopted as the cord, but the present invention relates to a cord obtained from the fiber material. The invention is not limited thereto, and a so-called paper twisted paper string made of paper may be employed.

In the above embodiment, a resin having biodegradability is applied to the coating layer 3. Instead, the thickness of the layer is, for example, 5 μm to 100 μm.
An ordinary thin synthetic resin such as polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, urethane or the like having a very small thickness of μm can also be used. When such an extremely thin ordinary synthetic resin is used for the coating layer, the coating layer surely protects the cord body 2 at the beginning of use and makes the agricultural and horticultural cord 1 easy to work as a coating layer. The coating layer does not undergo biodegradation after one span of agricultural and horticultural work (for example, six months), but deteriorates due to wind, rain, and irradiation of sunlight. When the string 2 is destroyed and the inner string 2 is exposed, the string 2 is decomposed by bacteria, and the coating layer is broken down and shredded, and mixed with the soil, which is disadvantageous for agriculture and horticulture. It does not occur.

[0041]

According to the string for agricultural and horticultural use according to the first aspect of the present invention, a string having biodegradability and a coating layer made of a synthetic resin coated on the outer peripheral surface of the string are used for agricultural and horticultural purposes. Because the cord is composed, the cord has an outer peripheral surface coated with synthetic resin, and the coating layer protects the cord, improving the strength of the agricultural and horticultural cord, and making it strong. Agricultural and horticultural work using the horticultural and horticultural cord can be easily performed, for example, and the fraying of the string can be reliably prevented, and rough hands and scratches can be prevented.

Further, by adopting a transparent synthetic resin for the coating layer, when the cord body is made of, for example, a natural fiber, it is possible to leave the texture of the natural fiber by forming the coating layer. Yes, the string for agricultural and horticultural use can be matched to the natural environment.

Furthermore, by appropriately setting the thickness dimension of the coating layer, it is possible to set the coating layer to be naturally destroyed by wind and rain or direct sunlight in one agricultural / horticultural span (for example, 6 months). Thus, even if the used agricultural and horticultural string is discarded in a field or the like as it is, the string body 2 exposed to the outside due to the destruction of the coating layer has biodegradability, so that it has bacteria. Can be broken down. Therefore, it is not necessary to perform a troublesome work for collecting used agricultural and horticultural strings as in the related art, and the efficiency of the agricultural and horticultural work can be promoted accordingly.

According to the string for agricultural and horticultural use according to the second aspect of the present invention, since the string body is made of one or both of paper and natural fiber, paper and natural fiber are abundant. And it is inexpensive, and can contribute to reduction of the production cost of the string for agricultural and horticultural use.

According to the string for agricultural and horticultural use according to the third aspect of the present invention, since a synthetic resin for the coating layer having biodegradability is employed, the used string for agricultural and horticultural use is directly discarded in a field or the like. However, the coating layer is also decomposed by the bacteria, and it is not necessary to collect all of the strings for agricultural and horticultural use, which is very effective in realizing efficient agricultural and horticultural work.

According to the string for agricultural and horticultural use of the present invention, the thickness of the coating layer is 5 μm to 500 μm.
When the thickness is less than 5 μm, it is possible to avoid the disadvantage that the coating layer is too thin and the cord body cannot be reliably protected.
If it exceeds 00 μm, it becomes difficult to freely bend the agricultural and horticultural strings due to the coating layer being too thick, and it is easy to perform agricultural and horticultural work such as binding fruit tree branches for attraction. The inconvenience of being unable to do so can be avoided, and thereby the efficiency of agricultural and horticultural work can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an agricultural and horticultural string according to the present invention.

FIG. 2 is a cross-sectional view of the agricultural and horticultural string of FIG.

FIG. 3 is a process chart showing one embodiment of a production process for producing a string for agricultural and horticultural use according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Agriculture and horticultural string 11 Immediately after coating 2 String body 21 Raw material jute 3 Coating layer 31 Polyvinyl alcohol P1 Spinning process P2 Coating process P3 Drying process

Claims (3)

[Claims] An agricultural and horticultural string comprising a biodegradable string and a coating layer of a biodegradable synthetic resin coated on an outer peripheral surface of the string. . 2. The string for agricultural and horticultural use according to claim 1, wherein the string body is made of one or both of paper and natural fibers. 3. The coating layer according to claim 1, wherein the coating layer has a thickness of 5 μm to 500 μm.
The string for agricultural and horticultural use according to claim 1, wherein the thickness is set to μm.