KR20200088668A - Multilayer Woven-Film For Multistage Cultivation Airdome House - Google Patents

Abstract

The present invention relates to a fabric used for a multi-stage cultivation of crops in an air dome house. According to the present invention, provided is a multilayer woven-film for a multistage cultivation air dome house, which can increase an amount of light that may be insufficient during multistage cultivation to obtain excellent heat insulation, has a small volume, reduces a temperature variation in winter as there is no environmental problem that powder is scattered due to damage during work, and can maintain the temperature of a rooting zone by increasing heat insulation.

Description

Multilayer Woven-Film For Multistage Cultivation Airdome House}

The present invention relates to a fabric used for multi-stage cultivation of crops in an air dome house, and more specifically, a multi-ply weave for properly maintaining the root zone temperature of a crop instead of tarpaulin or spirofoam as a cultivation tank containing soil or nutrient solution used for cultivation. It's about the film.

In recent years, agricultural facilities cultivated rapidly in the direction of smart farm greenhouses, but until now, pipe houses were covered with ordinary vinyl to grow them, but frequent climate change and the increase of agricultural workers due to returning home villages, the prevalence and scale of local food The smart farm greenhouse is increasing due to the government's measures to increase its agricultural competitiveness. Among the alternatives, Air Dome House facilities are being discussed in terms of economies of scale and energy savings.

In an air dome house multi-stage cultivation facility of 10 m or more, which is 5 times higher than the bundling of a regular house, the temperature variation in each stage should be less in order to induce even growth of crops. Existing Korean Patent Registration No. 10-1683607 relates to an aluminum multi-layered insulating curtain. From the top, a nonwoven fabric, a protective film (PET), an aluminum evaporation film, an aluminum thin film, a protective film (PET), and a waterproof nonwoven adsorbing nonwoven coating layer are sequentially stacked. It is configured, and by forming a small hole in the surface of the thermal insulation curtain by allowing a plurality of needles to pass through a fixed mechanism of the completed thermal insulation curtain, there is a disadvantage in that the strength is vulnerable because it is mainly composed of only a nonwoven fabric.

JP-A 2015-128375 was developed as a method of laminating a resin film, a nonwoven fabric, a resin film, a network structure and a hydrophilic nonwoven fabric, but this also has a disadvantage in that its strength is difficult and long-term use is difficult.

Conventional thermal insulation materials are mainly used for curtains or screens, and have long-term vulnerabilities. Insulated cultivation tanks used in multi-stage cultivation systems have interlayer distances in the 1st and 3rd cultivation stages, resulting in temperature fluctuations, and each cultivation tank is filled with topsoil or nutrient solution and keeps warmth in winter rather than in summer when growing crops. If it is not, the temperature of the roots will be lowered, which makes crop cultivation difficult. However, in order to reduce the temperature deviation and increase the heat retention, it is necessary to develop a multi-layer woven film in order to maintain the temperature in the root zone. The cultivation tank used for such multi-stage cultivation has been used as Styrofoam or PVC tarpaulin, but it has a problem in that it is difficult to maintain environmental problems, ease of use, and warmth.

Republic of Korea Patent No. 10-1683607 (announced on December 8, 2016) Japanese Patent Publication No. 2015-128375 (published on July 16, 2015)

Therefore, the present invention maintains the strength by using a polyethylene woven film as a base to solve these disadvantages of the prior art, and multi-stage cultivation by combining aluminum foil laminating and maintaining non-woven fabric for increasing the amount of irradiated light during multi-stage cultivation. The purpose of the present invention is to provide a cultivated fabric used to reduce the temperature deviation in winter and increase the thermal insulation power to maintain the temperature in the root zone.

Therefore, according to the present invention, a high-density polyolefin-based flat yarn containing hydrotalcite is woven into an inclined and weft intermediate layer,

Surface laminate layer made of low-density polyethylene formed on the surface of the intermediate layer,

An aluminum foil layer formed on the surface laminate layer,

A backside laminate layer made of low density polyethylene formed on the back side of the intermediate layer,

A multi-layer woven film for multi-stage cultivation of an air dome house is provided, which is made of a nonwoven fabric layer formed under the surface laminate layer.

The high-density polyolefin-based flat yarn of the multi-layer woven film for multi-cultivation of air dome house of the present invention is 80-89% by weight of high-density polyethylene having a specific gravity of 0.942~0.965, 5-10% by weight of HALS-based light stabilizer, 1-3% by weight of antioxidant, It is characterized in that it is a high density polyolefin-based flat yarn prepared by a Ti-die extrusion method by mixing 5 to 10% by weight of hydrotalcite.

The low-density polyethylene of the surface laminate layer and the rear laminate layer of the multi-layer woven film for multi-stage cultivation of the air dome house of the present invention is characterized by having a specific gravity of 0.915 to 0.922.

Therefore, according to the present invention, it is possible to increase the amount of light that may be insufficient during multi-stage cultivation, and thus has excellent heat retention, has a small volume, and does not have an environmental problem that powder is scattered due to breakage during work. It is possible to provide a multi-layer woven film for multi-stage cultivation of an air dome house that can maintain temperature.

1 is a cross-sectional view showing the structure of the multi-layer woven film of the present invention,
Figure 2 is a design drawing of the air dome house using the multi-layer woven film of the present invention,
Figure 3 is a photograph of a multi-stage snow cultivation device of the inner surface of the air dome house using the multi-layer woven film of the present invention,
4 is a photograph of a temperature meter.

If described in detail with reference to the accompanying drawings the present invention.

1 is a cross-sectional view showing the structure of a multi-ply woven film of the present invention.

The multi-layer woven film for multistage cultivation of the air dome house of the present invention is largely composed of an intermediate layer 10, a surface laminate layer 20, an aluminum foil layer 30, a backside laminate layer 40 and a nonwoven fabric layer 50.

In the intermediate layer 10, a high-density polyolefin-based flat yarn containing hydrotalcite is woven into warp and weft yarns.

The high-density polyolefin-based flat yarn has a density of 0.942 to 0.965, 80 to 89% by weight of high-density polyethylene, 5 to 10% by weight of a HALS-based light stabilizer, 1 to 3% by weight of an antioxidant, and 5 to 10% by weight of hydrotalcite. It is preferable to increase the heat retention that is manufactured by the die extrusion method.

In particular, the high-density polyethylene has a specific gravity of 0.942 to 0.965, which is preferable for manufacturing base films. When the density is less than 80% by weight, a problem arises in the strength of the woven film, and when it exceeds 89% by weight, the woven film has a hard feel like plastic. Causes problems. The HALS-based light stabilizer acts to improve weather resistance, and when it is less than 5% by weight, the problem of light intensity is weakened, and when it exceeds 10% by weight, there is a problem in light transmittance or workability.

Antioxidants act to prevent embrittlement by oxidizing agents in the air, such as NOX. When it is less than 1% by weight, embrittlement by air oxide occurs, and when it exceeds 3% by weight, there is a problem in workability during the process. . As the antioxidant, any one of phenol, amine, phosphorus, and sulfur may be used.

Hydrotalcite has an effect of increasing heat retention, and when it is less than 5% by weight, a thermal insulation effect is insignificant, and when it exceeds 10% by weight, there is a problem in strength or transparency.

The high-density polyethylene, light stabilizer (HALS), antioxidant, and hydrotalcite are mixed to prepare a flat 1-4 mm flat yarn at an extrusion temperature of 260 to 280°C, and the flat yarn is woven into a water jet loom to form an intermediate layer. .

A surface laminate layer 20 made of low-density polyethylene is formed on the surface of the intermediate layer 10, while extruding and laminating low-density polyethylene having a specific gravity of 0.915 to 0.922 to 280 to 300°C on the surface of the intermediate layer while forming a surface laminate layer. The aluminum foil layer 30 is stacked on the top of the surface laminate layer to adhere to the surface of the intermediate layer. The aluminum foil is selected to be suitable for the use purpose from 0.001mm to 0.1mm as it increases heat retention and acts as a thermal barrier in summer. In addition, the light reflected by the aluminum foil also acts to supplement the amount of insufficient light by the multi-stage cultivation facility.

On the back surface of the intermediate layer, a low-density polyethylene having a specific gravity of 0.915 to 0.922 is extruded and laminated at 280 to 300° C. to form a back laminate layer 40 while laminating a nonwoven fabric 50 to be attached to the back surface of the intermediate layer.

As the nonwoven fabric has an effect of increasing moisture and heat retention, synthetic resin nonwoven fabrics such as polyethylene, polypropylene, and polyethylene terephthalate may be used, and nonwoven fabrics made of wool or cotton may also be used.

The multi-layer woven film of the present invention configured as described above has an effect of maintaining heat retention and moisture retention.

In the following examples, non-limiting examples of manufacturing the multi-layer woven film of the present invention are given.

[Example 1]

1. Weaving of the middle layer

High-density polyethylene (specific gravity 0.956, 308U (Daehan Emulsion) 89% by weight, HALS-based light stabilizer 5.0% by weight, antioxidant 1.0% by weight, hydrotalcite 5.0% by weight, mixing ratio at 260°C by extruding extrusion method 1: 5, after producing a flat yarn having a yarn width of 2.4 mm and a fineness of 1,000 denier, weaving to a density of 10×10 and fabric width of 2.5 m at 750 rpm using a water jet loom to prepare an intermediate layer.

2. Manufacturing of multi-layer woven film

On the surface of the woven intermediate layer, a low-density polyethylene (specific gravity 0.922, 9730 (Hanhwa Chemical)) was used to laminate at 300°C with a T-die extruder, and at the same time, aluminum foil having a thickness of 0.01 mm was adhered.

Again, a low-density polyethylene (specific gravity 0.922, 9730 (Hanhwa Chemical)) was laminated on the back surface of the intermediate layer using a T-die extruder at 300°C, and at the same time, a polypropylene nonwoven fabric having a thickness of 0.5 mm was combined to prepare a multi-layer woven film.

[Comparative Example 1]

A general PVC tarpaulin was defined as Comparative Example 1.

[Experimental Example 1]

1. Multi-stage cultivation plant installation and demonstration test: Facility Horticulture Research Center (Haman)

As an air dome house designed as shown in Fig. 2 to test the manufactured multi-layer woven film as a double layer, a multi-layer woven film with a thickness of 0.1 to 0.3 mm is installed as a double layer, and a multi-stage snow cultivation device is manufactured on the inner surface as shown in FIG. Did. The width of the multi-stage cultivation tank is 30 cm, the length is 15 m, and the height of each stage is 1.0 m, 3 stages are installed, and the left side in FIG. 3 is a general PVC tarpaulin cultivation tank in Comparative Example 1, and the right side is a multi-layer woven film cultivation tank in Example 1. Installed. The installation interval between the left and right sides was 2m, making it convenient to flow agricultural machinery.

The hydroponic crop was strawberry (Sulhyang), the medium was coco peat, and the temperature in the medium was a temperature meter as shown in FIG. 4. It was officially set on September 05, 2018 and harvested from December 6.

Table 1 shows the results of the warming rate and the cultivation demonstration test of Example 1 and Comparative Example 1.

-According to the insulation rate test (KS K 0560:2011).

division Thermal insulation rate (%) Remark Example 1 64.3 Comparative Example 1 33.8

As a result of the thermal insulation test, it was confirmed that the thermal insulation rate of the multi-layer woven film was about twice that of the commonly used PVC tarpaulin cultivation tank.

-The test results of the medium temperature of the cultivation tank were shown in Table 2 below to measure the environment inside and outside the facility.(October 1, 2018-November 30, 2018)

month division Out
Temperature
(℃) Example 1 Comparative Example 1 Temperature
(℃) Humidity
(%) Cultivation
(℃) Temperature
(℃) Humidity
(%) Cultivation
(℃) October lowest 1.0 11.6 79.3 11.8 11.6 79.3 10.8 Best 25 16.9 94.9 17.2 16.9 94.9 17.8 Average 18 14.3 84.3 14.9 14.7 84.3 14.2 November lowest -1.0 10.3 74.0 11.0 10.3 74.0 10.0 Best 22 15.7 93.3 16.9 15.7 93.3 16.5 Average 17 13.8 83.7 14.7 13.8 83.7 13.7

As a result of measuring the culture medium temperature, it was found that Example 1 had better heat retention than Comparative Example 1.

10: middle layer 20: surface laminate layer
30: aluminum foil layer 40: back laminate layer
50: non-woven fabric layer

Claims (3)

High-density polyolefin-based flat yarn containing hydrotalcite is woven into an inclined and weft layer,
Surface laminate layer made of low-density polyethylene formed on the surface of the intermediate layer,
An aluminum foil layer formed on the surface laminate layer,
A backside laminate layer made of low density polyethylene formed on the back side of the intermediate layer,
Multi-layer woven film for multi-stage cultivation of an air dome house, characterized in that it consists of a non-woven fabric layer formed under the surface laminate layer. According to claim 1,
The high-density polyolefin-based flat yarn has a density of 0.942 to 0.965 and 80 to 89% by weight of high-density polyethylene, 5 to 10% by weight of HALS-based light stabilizer, 1 to 3% by weight of antioxidant, and 5 to 10% by weight of hydrotalcite. Multi-layer woven film for multi-stage cultivation of Air Dome House, characterized in that it is a high density polyolefin-based flat yarn manufactured by a die extrusion method. According to claim 1,
The low-density polyethylene of the surface laminate layer and the back laminate layer has a specific gravity of 0.915 to 0.922.

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