JP4522654B2 - Biodegradable net for vine plant cultivation and method for cultivating vine plants using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to materials used when cultivating vines and methods for cultivating vines using the same.
[0002]
[Prior art]
Conventionally, when growing vine plants such as long bean, peas, cucumbers, etc., it has been practiced to set up pillars at regular intervals, stretch nets between them and wind vines around this net to grow. . In the old days, ropes made of rice straw were used as materials for winding vines, but materials made of synthetic resin such as polyethylene have been used from the viewpoint of strength.
[0003]
Conventionally, plant residues after harvesting have been incinerated or composted by field burning. However, in the case of incineration by field burning, in the case of incineration by field burning, the amount of heat at the time of incineration is insufficient. In the case of composting, it is necessary to separate the plant to be composted from the materials used during cultivation, which requires a lot of trouble. ing. In recent years, composting is considered to be the mainstream due to the restriction of treatment by field burning, but the problem of separation of plants and materials used during cultivation has become more acute.
[0004]
In addition, as a technique using a degradable member in the cultivation method of a vine plant, there exists patent document 1, but this is not proposed as a material which winds a vine.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-304764 [0006]
[Problems to be solved by the invention]
The present invention was made in view of the current situation, and when composting after harvesting vines such as long bean, peas, and cucumbers, the plant residue after harvesting and the materials used during cultivation are separated. The purpose is to provide a net for vine plant cultivation that can be composted without any waste, and in the cultivation of vines such as long bean, pea, cucumber, etc. It aims at providing the cultivation method of the vine plant which does not need to separate the residue and the material used at the time of cultivation.
[0007]
[Means for Solving the Problems]
The present invention achieves the above-mentioned object, and is a net composed of yarns made of a thermoplastic aliphatic polyester polymer having biodegradability, and the yarns constituting the net are multi-layers. Biodegradable net for vine plant cultivation characterized in that it is composed only of combustible yarn using only filament yarn, and biodegradability for vine plant cultivation described above, wherein the aliphatic polyester polymer is polylactic acid When cultivating nets and vines, the above-mentioned biodegradable nets composed of yarns made of thermoplastic aliphatic polyester polymer having biodegradability for winding vines are used. The gist of the vine plant cultivation method is characterized in that a material comprising an aliphatic polyester polymer having biodegradability is used as the attachment material.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0009]
The biodegradable net for vine plant cultivation of the present invention is composed of yarns made of a thermoplastic aliphatic polyester polymer having biodegradability. Examples of the thermoplastic aliphatic polyester polymer having biodegradability that can be used in the present invention include polyglycolic acid that is poly (α-hydroxy acid), a polymer composed of polylactic acid, or a copolymer thereof, Or poly-3-hydroxybutyrate, poly-3-hydroxycaprolate, poly-3-hydroxyheptanoate, poly-3-hydroxyoctanoate, and these with poly-3-hydroxyvalerate or poly-4- Poly (β-hydroxyalkanoate) which is a copolymer with hydroxybutyrate, or polyethylene oxalate, polyethylene succinate, polybutylene oxalate, polybutylene succinate which is a polycondensation polymer of glycol and dicarboxylic acid Or a copolymer thereof.
[0010]
Among these, polylactic acid which is difficult to decompose in normal air and rapidly decomposes under high temperature and high humidity like composting conditions is suitable. Since polylactic acid tends to be hard when it becomes a yarn having a large single yarn fineness, in such a case, another aliphatic polyester polymer such as polybutylene succinate, , An aliphatic-aromatic copolymerized polyester-based polymer such as polybutylene succinate adipate may be used for yarn production. In the present invention, the biodegradable thermoplastic polymer may contain various additives such as a matting agent, a pigment, a light stabilizer, a heat stabilizer, and an antioxidant as necessary. It may be added.
[0011]
The yarn constituting the net is a folded and twisted yarn using only multi filament yarn produced by melt spinning using a thermoplastic aliphatic polyester-based polymer described above. A plurality of yarns constituting the net are twisted and used by twisting.
[0013]
When a multifilament yarn is used, a yarn excellent in mechanical properties such as strength can be obtained, and flexibility is improved, so that it is excellent in handleability and advantageous in terms of biodegradability .
[0015]
The biodegradable net for vine plant cultivation of the present invention can be obtained by using a yarn making machine such as a cocoon making machine using the above-described yarn. It can also be obtained by forming a mesh by knitting with a mesh structure using a warp knitting machine such as a Russell knitting machine. Examples of the mesh shape include squares, rhombuses, and hexagons. The size of the mesh may be selected depending on the plant to be cultivated, but is often a mesh having a side of 5 to 30 cm.
[0016]
When cultivating vines such as long bean, peas and cucumbers, the above biodegradable net for cultivating vines is used for winding the vine, and the biodegradable aliphatic as a material for attaching the net It is preferable to use a material made of a polyester polymer. When vine plants are cultivated, props are erected at regular intervals, ropes are passed up and down, the net is spread evenly, and the plants are grown by winding the vines around the net.
[0017]
At this time, as the net, the above-described biodegradable net for plant cultivation is preferably used, and the class used to stretch the net is preferably a class made of an aliphatic polyester polymer having biodegradability. . The ropes used to stretch the net include ropes, twisted yarns, twains, etc., tape-like narrow woven fabrics, or biodegradable yarns made of a biodegradable aliphatic polyester polymer. A twain twisted with a yarn made by slitting a film made of an aliphatic polyester polymer, a slit yarn made by slitting a nonwoven fabric such as a spunbond nonwoven fabric made of an aliphatic polyester having biodegradability, a yarn twisted with this slit yarn, etc. Can be used.
[0018]
When cultivating vines in this way, a biodegradable net is used as a net for vines, and a class used for extending the net is also a class consisting of a biodegradable aliphatic polyester polymer. When composting after harvesting, the material is biodegraded under composting conditions without separating the plant residue from the material. Will be able to. Of course, the struts used to stretch the net may also be composted using a biodegradable material, but the struts are preferably reused because they are easy to separate.
[0019]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, evaluation in an Example was performed with the following method.
(1) Strength of yarn: Based on JIS L 1013, measurement was performed using a constant speed extension type testing machine at a grip interval of 25 cm and a tensile speed of 30 cm / min.
[0020]
(2) Nodule strength: measured based on JIS L1013.
[0021]
(3) Composting test: The test was performed under the conditions described below.
Tester; Aerobic compost tester contents: Combost fully matured type / Compost semi-matured type = 1/1 (mixture)
Temperature: 58 ℃ ± 2 ℃
Humidity; Saturation days; 18 days
Example 1
Three 560 decitex 96-filament multifilament yarns made of polylactic acid with a strength of 5.0 cN / dtex are twisted at a twist rate of S50 times / m, and these three yarns are twisted at a Z120 times / m twist rate. Using a twisted twisted yarn, a net having a square of 25 cm on one side is made with a smoke netting machine, and a seam set is set with a setter to obtain the biodegradable net for vine plant cultivation of the present invention. Obtained. The strength of the twisted yarn used in the netting was 235N, and the knot strength of the obtained net was 153N.
[0023]
The biodegradable net for vine plant cultivation obtained was used as a net for winding vines of vines, with wooden pillars standing at intervals of 3 m, with a rope made of polylactic acid fiber at the top of the net, and at the bottom The net was stretched through slit yarn of a film made of a biodegradable polymer mainly composed of polylactic acid and used for cultivation of long bamboo shoots. After harvesting the long persimmon, the net and the stem of the long persimmon were wound up and tested after composting. The rope used in the upper part as a secondary material is obtained by twisting nine multifilament yarns of 560 dtex 96 filaments made of polylactic acid with a strength of 5.0 cN / dtex, with a twist number of S50 times / m. A rope obtained by striking a book using three twisted yarns twisted at a twist number of 40 times / m. The slit yarn of the film used at the bottom is a mixture of polylactic acid and polybutylene succinate. A film having a thickness of 100 μm is slit to a width of 100 mm, and then a slit yarn stretched seven times is twisted Z100 times / m.
[0028]
Comparative Example 1
In Example 1 , the vine of the comparative example was used in the same manner as in Example 1 except that three 560 dtex monofilament yarns made of polyethylene were twisted at a twist number of Z50 times / m. The net for sex plant cultivation was obtained.
[0029]
Using the rope made of polyethylene for net expansion, it was used for the cultivation of long straw in the same manner as in Example 1, and the post-harvest composting test was conducted, but the net and auxiliary materials remained in the original form, and as compost It was not ready for use.
[0030]
【The invention's effect】
If the vine plant cultivation net of the present invention is used, composting after harvesting vines such as long bean, peas, cucumbers, etc. without separating the plant residue after harvesting and the materials used during cultivation Can be realized.

Claims (3)

A net which is formed by a the yarn made of a thermoplastic aliphatic polyester-based polymer having biodegradability, yarn constituting the net is configured only if retardant yarns using only multifilament yarn A biodegradable net for vine plant cultivation characterized by this.   The biodegradable net for vine plant cultivation according to claim 1, wherein the aliphatic polyester polymer is polylactic acid. The biodegradable net according to claim 1 or 2, wherein the biodegradable net is composed of a thread composed of a thermoplastic aliphatic polyester polymer having biodegradability for vine winding when vines are cultivated. And using a material comprising an aliphatic polyester polymer having biodegradability as a material for attaching the net, a method for cultivating a vine plant characterized by the above.