JPH11243791A - Vinyl chloride-based resin film for agricultural use and production the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride-based resin film for an agricultural use having a good working property for a ventilation work, etc., by a winding up and re-winding, and hardly generating an issue of forming wrinkles in the wound part, etc., and to provide a method for producing the same. SOLUTION: This vinyl chloride-based film for an agricultural use formed with a fine unevenness at end thereof, is obtained by processing a breadth connection of a vinyl chloride-based resin film formed with fine unevenness 11 with a vinyl chloride-based resin film not formed with the fine unevenness 12 so that at least the film positioned at the furthest end becomes the vinyl chloride-based resin film formed with the fine unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin film for agricultural use which is spread on agricultural facilities such as agricultural houses and tunnels.

[0002]

2. Description of the Related Art Conventionally, as covering materials for agricultural facilities such as agricultural houses and tunnels, polyvinyl chloride resins such as polyvinyl chloride and ethylene-vinyl chloride copolymer resins, and polyethylene and ethylene-vinyl acetate copolymers have been used. A single-layer or multiple-layer transparent film made of a synthetic resin such as an olefin resin such as a resin, a polyester resin, or a fluorine resin is used. Above all, films made of vinyl chloride resins such as polyvinyl chloride are widely used because they are inexpensive, have good transparency, are excellent in heat insulation and strength, and are easy to form into films (having good workability). Have been.

[0003] In the above-mentioned agricultural facility, ventilation work may be performed by winding up or down a part of the covering material in order to adjust the temperature and humidity in the facility. At this time, winding and rewinding in the vicinity of the end of the film are usually performed.

On the other hand, a film made of a vinyl chloride resin such as polyvinyl chloride has a problem that the surface of the film is easily sticky, the film surfaces are easily adhered to each other, and it is difficult to rewind the film wound up as described above. There is.

As a solution to the above-mentioned problem, a film in which fine irregularities are formed at one end or both ends of a film, as proposed in Japanese Patent Application Laid-Open No. 49-18627, The light transmission required for the growth of
There is known a film in which fine irregularities are formed at an end portion of a film where winding and rewinding operations are frequently performed while securing a portion where fine irregularities are not formed, thereby suppressing adhesion between films.

[0006]

Incidentally, the formation of fine irregularities on the film surface is usually carried out by embossing. That is, the above-mentioned JP-A-49-1
When fine irregularities are formed at one end or both ends of the film as proposed in Japanese Patent No. 8627, embossing is performed only on one end or both ends of the film. However, when the embossing is partially performed in this way, the shape (particularly, the edge) of the film becomes unstable due to a difference in distortion between the embossed portion and the non-embossed portion. Moreover, since the embossed portion is a portion where the winding and rewinding work is performed as described above, if the shape of the portion is unstable, the portion cannot be uniformly wound. The wrinkles tend to be formed when the film is formed, and such wrinkles are a cause of adhesion of dust and the like to the surface of the film (the wrinkled portion) and tearing of the film.

Further, when embossing is performed only on the end portion as described above, the boundary between the embossed portion and the non-embossed portion is lower in strength than other portions, and especially the boundary is at the film edge. JP-A-49-49, which is a straight line parallel to the part
In the case of the film described in Japanese Patent No. -18627, there is also a problem that this boundary portion is easily broken when a load such as tension is applied.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a vinyl chloride resin film for agricultural use in which adhesion of a wound portion is effectively suppressed without destabilizing the shape of the film. To provide.

[0009]

Means for Solving the Problems A vinyl chloride resin film for agricultural use according to the present invention made to solve the above-mentioned problems comprises a vinyl chloride resin film having one or more fine irregularities formed thereon and one or more fine A transparent vinyl chloride resin film having no irregularities formed thereon is obtained by cross-joining such that at least one endmost film is a vinyl chloride resin film having fine irregularities formed on the surface.

[0010] The vinyl chloride resin in the present invention is the same as the vinyl chloride resin used in a conventionally used agricultural vinyl chloride resin film. Other than the unified polyvinyl chloride, a copolymer resin of vinyl chloride and another monomer such as ethylene, or a mixture thereof.

The above-mentioned vinyl chloride resin may contain, if necessary, a plasticizer, a stabilizer, a drip-proof agent, an anti-fog agent, a lubricant or an anti-adhesive, an ultraviolet absorber, a light stabilizer, an antioxidant, an inorganic Alternatively, various additives generally used in conventional agricultural vinyl chloride resin films, such as an organic filler, a heat insulating agent, and a colorant, are used to obtain a vinyl chloride resin composition.

The vinyl chloride-based resin composition comprising the above-mentioned vinyl chloride-based resin and various additives optionally added is mixed and kneaded by appropriate means, and then calendered, extruded, and blown. It is formed into a film having a desired thickness and width by a known means such as a method.

The thickness of each of the formed film having the fine irregularities and the film not having the fine irregularities is not particularly limited, but is generally 0.01 to 0.
The range is about 3 mm.

The width of the film to be formed is not particularly limited, but the width of the vinyl chloride resin film on which fine irregularities are formed is 200 to 1
The width of a vinyl chloride resin film that does not form fine irregularities is about 500 mm, and the width is generally about 1000 to 5000 mm. Incidentally, the vinyl chloride resin film having the fine irregularities has a lower light transmittance than the vinyl chloride resin film which does not have the fine irregularities, even if the area of the portion where the fine irregularities are formed is minimized. The width of the vinyl chloride resin film on which the fine irregularities are formed is desirably the minimum width that can secure the width required for the winding operation.

The vinyl chloride resin film having fine irregularities used in the present invention is obtained by subjecting the vinyl chloride resin film obtained as described above to embossing, for example, satin or silk. It can be obtained by: In the present invention, regardless of the embossing,
It is also possible to use a film in which fine irregularities are formed on the surface by blending a crosslinked vinyl chloride resin in the vinyl chloride resin composition and stretching the film during film formation.

The film on which the fine irregularities are formed may be one in which fine irregularities are formed on the entire surface of the film, but more preferably, the area ratio between the fine irregularities formed portion and the non-fine irregularities formed portion is 10%. : 90 to 90:10, preferably 30:70 to 70:30, in which the fine unevenness forming portion and the fine unevenness non-forming portion are mixed. This is because a film having fine irregularities formed on the entire surface creates a portion in the agricultural facility where light transmission is insufficient, which hinders the growth of the crop. On the other hand, when the fine unevenness forming portion and the fine unevenness non-forming portion are mixed, the adhesion between the film surfaces is suppressed by the fine unevenness forming portion,
In addition, since the light transmission can be ensured by the fine unevenness-free portion, the above-described problem does not occur.

In the case where the fine unevenness forming portion and the fine unevenness non-forming portion are mixed, the shape of the fine unevenness forming portion (or the fine unevenness non-forming portion) may be, for example, a vertical, horizontal, diagonal stripe shape (by a wavy line or the like). Any shape such as a stripe shape), a lattice shape, an oblique lattice shape, a polka dot shape, or the like can be used. Is desirable. That is, when there is an unevenness in the fine unevenness forming portion (or the fine unevenness non-forming portion), similar to the above-mentioned agricultural vinyl chloride resin film in which the fine unevenness is formed only at one end or both ends. This is because a difference in distortion occurs between the portion where the fine unevenness is formed and the portion where the fine unevenness is not formed, and the shape becomes unstable. When the shape of the vinyl chloride resin film on which the fine irregularities are formed becomes unstable as described above, in addition to the problem that wrinkles are likely to be formed during the above-described winding and rewinding operations, workability when these are jointed is also deteriorated. There is also the problem of doing so. In addition, if there is a bias in the fine unevenness forming portion, a portion where the light transmission is insufficient in an agricultural facility is created, and there is a problem that the growth of the crop is hindered.

A vinyl chloride resin film having fine irregularities and a vinyl chloride resin film not having fine irregularities are provided with a so-called dustproof property on a surface which becomes an outer surface when spread on an agricultural facility such as an agricultural house. And a coating film of various paints such as water-based, solvent-based, and ultraviolet-curing type paints for the purpose of imparting water. In addition, a vinyl chloride resin film having fine irregularities and a vinyl chloride resin film not having fine irregularities are provided with a so-called drip-proof property on a surface which becomes an inner surface when spread on an agricultural facility such as an agricultural house. May be formed by applying the above-mentioned various paints to which a hydrophilizing substance such as colloidal silica is added for the purpose of imparting water.

As means for joining the vinyl chloride resin film having the fine irregularities formed thereon and the vinyl chloride resin film having no fine irregularities, the conventionally employed means can be employed as it is. It is best to use a high-frequency sewing machine that is simplest and has a good finish.

The vinyl chloride resin film for agriculture of the present invention obtained as described above is used for winding and rewinding operations, specifically, a side part, a skylight side part, and a skylight part of an agricultural house. , A valley (of a multi-family house), etc., is stretched so that a vinyl chloride resin film having fine irregularities formed thereon comes. And, the agricultural vinyl chloride resin film of the present invention stretched as described above is unlikely to cause wrinkles at the time of winding, and it is also unlikely that the films adhere to each other at the time of rewinding. The workability when performing ventilation work is good.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a view showing a continuous agricultural house using the vinyl chloride resin film for agricultural use of the present invention.

The agricultural house 9 shown in FIG.
The cover material made of a vinyl chloride-based resin film is spread over the skylight, and the skylight side portions and the valley portions are portions where winding and rewinding operations for ventilation are performed.

In the places where the winding and rewinding operations are performed,
The vinyl chloride resin film 11 in which fine irregularities are formed in an oblique stripe shape is extended so as to come. Further, the vinyl chloride resin film 11 having the fine irregularities formed thereon
Is connected to the vinyl chloride resin film 12 that does not form fine irregularities by using a high-frequency sewing machine (joint portions are indicated by S).

The vinyl chloride resin film 11 having the fine irregularities formed thereon is connected to a winding roller 92. The winding roller 92 is a vinyl chloride resin film having the fine irregularities formed by a winding device (not shown). The film 11 is wound up and rewound. The ventilation roller K is adjusted by winding up and rewinding the vinyl chloride resin film 11 formed with fine irregularities connected to the winding roller 92, and the temperature and humidity in the house are adjusted to the growth of the crop. Keep it in a state of being.

Next, the vinyl chloride resin film for agricultural use of the present invention is shown in FIG. As shown in FIG. 2, the vinyl chloride resin film 1 for agricultural use of the present invention is formed by joining a vinyl chloride resin film 11 having fine irregularities and a vinyl chloride resin film 2 having no fine irregularities. (Indicated by S). In addition, the vinyl chloride resin film 11 on which the fine unevenness is formed has a fine unevenness forming portion 11.
a and the fine unevenness-free portion 11b are formed in an oblique stripe shape.

The vinyl chloride resin film 1 for agriculture of the present invention is formed by using a high frequency sewing machine or the like so that at least one of the films located at the outermost ends becomes the vinyl chloride resin film 11 having fine irregularities. The width is joined. Of course, as shown in FIG. 2A, a vinyl chloride resin film 11 having fine irregularities formed at both extreme positions may come, or as shown in FIG. 2B. Note that the vinyl chloride resin 11 having the fine irregularities formed only at one of the outermost positions may come. FIG. 2 shows only one piece of the vinyl chloride resin film 12 which does not form fine irregularities. However, as shown in FIGS. 3 (a) and 3 (b), the vinyl chloride resin film 12 does not form fine irregularities. The resin film 12 may be formed by joining two sheets (of course, two or more sheets may be joined).

Further, in FIG. 3A, a vinyl chloride resin 12 which does not form fine irregularities,
12, it is also possible to join the width by inserting a vinyl chloride resin film having fine irregularities, but from the viewpoint of securing light transmission, FIG.
As shown in FIG. 3, it is more preferable that the vinyl chloride resin film having the fine irregularities formed thereon is not width-joined except at the ends. Furthermore, it is also possible to join two or more vinyl chloride resin films having fine irregularities at the ends to the ends, but from the viewpoint of ensuring light transmission, as described above, the fine irregularities are reduced. It is desirable that the formed vinyl chloride-based resin film has a minimum necessary width, and if it is of such a width, one fine unevenness was formed without dare to join two or more films. A vinyl chloride resin film should be sufficient. However, when the agricultural facility to be spread is large and it is difficult to obtain a vinyl chloride resin film with fine irregularities of the width required for winding, such as when the vinyl chloride resin film with fine irregularities is formed. It may be necessary to join two or more resin films in width.

In FIG. 1 to FIG.
a and the unevenness non-forming portion 11b are formed in oblique stripes, but the vinyl chloride resin film having fine unevenness used in the present invention is not limited to this. It may be one in which fine irregularities forming parts (fine irregularities non-forming parts) such as horizontal stripes (including stripes formed by wavy lines or the like), lattices, oblique lattices, polka dots, etc. may be formed. In addition, it is possible to use even those having fine irregularities formed on the entire surface, but from the viewpoint of improving the growing condition of the crop, preferably, the oblique stripe shape as shown in FIGS. -It is preferable that fine unevenness is formed such that the fine unevenness forming portions (fine unevenness non-forming portions) are substantially uniformly dispersed, such as a horizontal stripe shape, a lattice shape, an oblique grid shape, a polka dot shape, or the like. It is.

[0029]

The agricultural vinyl chloride resin film of the present invention is formed by joining a molded vinyl chloride resin film having fine irregularities and a vinyl chloride resin film not having fine irregularities. There is no difference in distortion like a vinyl chloride resin film for agriculture in which fine irregularities are formed only at one end or both ends of such a film.
Therefore, wrinkles are unlikely to occur during winding and rewinding operations. Therefore, there is an advantage that workability such as ventilation work performed by winding and unwinding is good.

Further, like a conventional vinyl chloride resin film for agricultural use having fine irregularities formed only at the ends, the boundary between the fine irregularities formed portion and the non-fine irregularities formed portion is a straight line parallel to the film end. Therefore, it is difficult for this boundary portion to be broken when a load such as tension is applied.

[Brief description of the drawings]

FIG. 1 is a view showing an agricultural house (a serial agricultural house) using the agricultural vinyl chloride resin film of the present invention.

FIG. 2 is a view showing an example of an agricultural vinyl chloride resin film of the present invention.

FIG. 3 is a view showing another example of the agricultural polyvinyl chloride resin film of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Agricultural vinyl chloride resin film 11 ... Vinyl chloride resin film which formed fine unevenness 12 ... Vinyl chloride resin film which did not form fine unevenness 9 ... Agricultural house 91 ... House frame 92: Roller for winding

Claims (4)

[Claims] Claims: 1. An agricultural vinyl chloride resin film, which is spread on an agricultural facility such as an agricultural house and is obtained by jointly processing two or more vinyl chloride resin films. The vinyl-based resin film is a vinyl chloride-based resin film in which one or more fine irregularities are formed, and a vinyl chloride-based resin film in which one or more fine irregularities are not formed. The film located at one end is a vinyl chloride resin film for agricultural use, which is a vinyl chloride resin film having fine irregularities formed on the surface. 2. A vinyl chloride resin film having fine irregularities formed on its surface, wherein a fine irregularity forming portion and a fine irregularity non-forming portion are mixed, and a fine irregularity forming portion and a fine irregularity non-forming portion are mixed. The vinyl chloride resin film for agricultural use according to claim 1, wherein the fine irregularities are formed so that the area ratio is in the range of 10:90 to 90:10. 3. A method for producing a vinyl chloride resin film for agricultural use, wherein fine irregularities are formed on at least one end of the film. A vinyl resin film and a vinyl chloride resin film in which one or more fine irregularities are not formed, so that the film located at least at one end is a vinyl chloride resin film in which fine irregularities are formed on the surface. A method for producing vinyl chloride resin films for agricultural use that are to be jointed. 4. The method for producing a vinyl chloride resin film for agricultural use according to claim 3, wherein the width joining is performed using a high frequency sewing machine.