JP2590722Y2 - Agricultural mulching film - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural mulching film having improved durability and color strength at seams, suitable for cultivation of crops to be sown or planted in spring and harvested in summer, particularly sweet potatoes. Things.

[0002]

2. Description of the Related Art Conventionally, mulch cultivation methods have been widely used for the purpose of raising soil temperature, controlling weeds, preventing water evaporation, and preventing outflow of fertilizers. Typical mulching films used for cultivation of these mulches include a transparent mulching film and a black mulching film.A transparent mulching film is used for the purpose of raising the soil temperature, and a black mulching film is used for the purpose of suppressing weed growth. Film was used.

[0003] However, these conventional mulching films are not enough to be applied to crops having different sowing times, harvesting times, growth conditions and the like. For the purpose of improving these, for example, a milky white reflective film layer that reflects light and a black film layer that absorbs light transmitted through the reflective film layer are laminated, and in summer, the increase in soil temperature is suppressed and the growth of weeds is suppressed. Mulching film (Japanese Utility Model Publication No. 55-38369) suitable for use as a light reflecting agent having high ultraviolet reflectivity on a film in which a reflective film layer 2 containing titanium oxide and a black film layer 3 containing carbon black are laminated. A mulching film suitable for use in summer having a function of preventing soil temperature rise, prevention of weed occurrence and insect repellency, which is formed by laminating a film layer 1 for preventing sucking insects from flying, which contains garlic (see Japanese Utility Model Publication No. Sho 62-30927). ), A mulch that has an effect of suppressing soil temperature rise and weed growth and is excellent in weather resistance by laminating a yellow colored film and a blue colored film Mulching film lamination type, such Irumu (Japanese Utility Model 59-38133 JP) have been proposed.

A mulching film having a black-transparent-black color scheme and capable of simultaneously exhibiting a function of promoting the growth of crops and suppressing the growth of weeds (Japanese Patent Laid-Open No. 50-129339).
JP-A No. 1993-76), a heat-insulating color multi-film consisting of a light-shielding film on both sides in the longitudinal direction, and a light-transmitting film in the center (Japanese Utility Model Application Laid-Open No. 60-149856), and a portion reflecting the ridge on the upper surface of a black film. Mulching film for controlling soil temperature (Japanese Utility Model Application Laid-Open No. 2-36951), a multi-film for agriculture comprising a combination of a film A of a soil temperature rising type and a film B of a soil temperature suppression type in a fixed ratio in the longitudinal direction of the film. 61-2015
No. 49) has also been proposed.

However, a mulching film obtained by simply laminating films having different functions has a limit in the range of functions that can be obtained. In addition, if the color scheme of a color mulching film is manufactured by printing, painting, or the like, there is a problem in durability. was there. Further, when the film itself is colored, there is a problem that the strength of the color joint is insufficient due to the production method.

[0006]

SUMMARY OF THE INVENTION The present invention has a function of controlling soil temperature, controlling insects, and preventing the growth of weeds. An object of the present invention is to provide a mulching film having improved part strength.

[0007]

According to the present invention, there is provided a mulching film 1 having a three-layer structure made of a polyolefin-based synthetic resin, wherein an intermediate layer 3 of the mulching film 1 is provided.
Are arranged in a band shape in the longitudinal direction on both sides 31, 31 ′ colored milky white and a central part 32 colored transparent or black or silver, and on the side of the intermediate layer 3 which is in contact with the soil surface. The black surface layer 2 has a transparent surface layer 4 on the other side.
Are provided, and the central portion 32 of the intermediate layer 3 is further provided.
Has a width of 150 to 500 mm.

Hereinafter, the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the mulching film 1 of the present invention has a three-layer structure made of a polyolefin-based synthetic resin. The intermediate layer 3 is colored in a band shape in the longitudinal direction on both sides 31, 31 'and the center 32. The three-layer structure has a surface layer 2 on the side in contact with the soil surface of the colored intermediate layer 3 and a surface layer 4 on the other side. Therefore, the surface layers 2 and 4 made of a polyolefin-based synthetic resin are laminated on both surfaces of the color joint portion (each boundary portion between the both sides 31 and 31 ′ and the central portion 32) of the intermediate layer 3. A mulching film 1 excellent in durability and strength can be obtained, in which the problem that the seam portion of the color scheme is insufficient due to a shortage, which is a drawback of the conventional color mulching film, is broken.

Moreover, the mulching film 1 of the present invention
Is that the surface layer 2 in contact with the soil surface is black, the sides 31 and 31 ′ of the intermediate layer 3 are milky white, the center 32 is transparent or black or silver, and one surface layer 4 is transparent. It is colored. That is, the mulching film 1 of the present invention includes, in order from the side in contact with the soil surface, both sides 31 of the intermediate layer 3,
The portion corresponding to 31 'has a three-layer structure of black / milky white / transparent, and the portion corresponding to the central portion 32 has a three-layer structure of black / transparent or black or silver / transparent. With such a configuration, the portions corresponding to the both sides 31, 31 ′ of the mulching film 1 of the present invention have a function of suppressing an increase in the ground temperature, and a portion corresponding to the central portion 32 has a function of increasing the ground temperature. It is possible to provide an agricultural mulching film 1 having a function that cannot be obtained by a conventional mulching film in which films having different functions are laminated. Here, the portion corresponding to the central portion 32 of the intermediate layer 3 covers the soil surface closest to the seeded or planted crop. That is, if the width of the central portion 3 of the middle layer 3 is too narrow, it is effective only in the early stage of growing the crop, and if it is too wide, the ground temperature rises in summer and a high-quality crop cannot be obtained, which is not preferable. Therefore, the width of the central portion 32 is 150 to 5
About 00 mm is preferable.

Both the surface layers 2, 4 and the intermediate layer 3 of the agricultural mulching film 1 of the present invention are made of polyolefin synthetic resin such as polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer. What was colored by appropriately mixing carbon black, titanium oxide, aluminum powder and other fillers, pigments, dyes and the like is used. In this case, if necessary, other additives may be added to the resin. Then, for example, using four extruders, the first extruder is used to supply the raw material of the surface layer 2 composed of a black pigment and a polyolefin-based synthetic resin, and the second extruder is used to supply the white pigment and the polyolefin-based synthetic resin. The raw material of the central portion 32 of the intermediate layer is used in the third extruder, the raw material of the central portion 32 of the intermediate layer is used in the third extruder, and the raw material of the surface layer 4 made of the polyolefin-based synthetic resin is used in the fourth extruder. Each can be supplied and manufactured by the inflation coextrusion method. Further, the mulching film subjected to a perforating process or other processes is also included in the present invention.

[0011]

[Action and Effect] Agricultural mulching film 1 of the present invention
Has a structure as described above, and as shown in FIG. 2 (A), the roots of the crop are not so tight during the growing period from the time of sowing or planting, so that the hair roots are attached to the central portion 32 of the mulching film. Exists in the soil covered by the portion corresponding to, and the growth of the ground is promoted because the ground temperature in the vicinity is rising. 2 (B), the roots of the crop spread considerably in the summer, when the crop grew considerably, and mainly on the milky white sides 31 and 31 ′ of the middle layer 3 of the mulching film 1. Since it is present in the soil covered by the corresponding portion, the rise of the ground temperature is suppressed, and the trouble caused by the high temperature can be prevented. Therefore, it can be suitably used for cultivation of crops harvested in summer, such as sweet potatoes, sown or planted in spring.

Further, since the agricultural mulching film 1 of the present invention has a coloration of the intermediate layer 3 and the surface layers 2 and 4 are laminated on both surfaces of the intermediate layer 3, a conventional color mulching film in which the film itself is colored. Not only is it possible to prevent tears due to insufficient strength of the color joints, which is a disadvantage of the color scheme, but it also has extremely superior durability and strength compared to color scheme mulching films manufactured by printing and painting, so it is severe It has the feature that it will not be damaged even under various weather conditions.

Furthermore, since the surface layer 2 in contact with the soil surface is colored black, weeds can be prevented from growing similarly to the conventional black mulch while performing the function of controlling the soil temperature, and the intermediate layer 3 can be prevented. When the central portion 32 is colored silver which easily reflects ultraviolet rays, it also has an insect repellent effect by the action of ultraviolet rays.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an agricultural mulching film of the present invention.

FIG. 2 is a cross-sectional view showing a use state of the agricultural mulching film of the present invention, wherein (A) shows a state at the time of growing and (B) shows a state at the time of harvesting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Agricultural mulching film 2 Surface layer in contact with the soil surface 3 Intermediate layer 31, 31 'Both sides of intermediate layer 32 Central part of intermediate layer 4 Other surface layer 5 Crops 51 Crops root

Claims (2)

(57) [Scope of request for utility model registration] 1. A mulching film 1 having a three-layer structure made of a polyolefin-based synthetic resin, wherein an intermediate layer 3 of the mulching film 1 has both sides 31 colored in milky white.
31 'and the central part 32 which is colored transparent or black or silver
And the intermediate layer 3 is colored in a strip shape in the longitudinal direction.
A mulching film 1 for agricultural use, characterized in that a black surface layer 2 is laminated on the side in contact with the soil surface and a transparent surface layer 4 is laminated on the other side. 2. The width of the central portion 32 of the intermediate layer 3 is 150 to 50.
The agricultural mulching film according to claim 1, wherein the thickness is 0 mm.