JP2003018925A - Agricultural film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural film having low material cost and working cost, capable of surely being fixed as a film for a tunnel without inhibiting growth of culture crops such as grape and pear, and further needing no fractional treatment when it is disposed as waste plastics. SOLUTION: Reinforcing belts 2 of thin width are placed on both the edges along the longitudinal direction of a long polyolefin film 1. Film bands 3 of >=20 mm and <=100 mm in width, and >=20 cm and <=50 cm in length are welded on the reinforcing belts 2 with a span of 50-70 cm by forming welded parts 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural film, and more particularly, to an agricultural film that makes it extremely easy to fix a tunnel film that covers the upper surface of a grape rack or a pear rack.

[0002]

2. Description of the Related Art Conventionally, a method shown in FIG. 5 has been adopted as a fixing means for a tunnel film covering the upper surface of a grape rack or a pear rack. That is, the long film 100
Reinforcing bands 101 having a narrow width are provided on both ends of the film along the longitudinal direction of the film, and eyelets 102 are formed at certain intervals on the portions of the reinforcing band 101 to form cord holes 103. The eyelet size is about 10 mm in diameter, and the diameter of the cord hole is about 5 mm. A black band 104 (black is the mainstream, but there are other colors) is attached to the cord hole 103, and the black band 104 is connected to a shelf member (not shown) to fix the tunnel film.

However, such a method requires eyelet materials for eyelet processing, the eyelet processing operation is complicated, and the material cost and the work cost are high.
In addition to this, the work of binding the black band 104 to the cord hole 103 is also very complicated, which is a great labor for the farmer.

Also, after the film is spread, with the passage of time,
Due to the effect of strong winds, there was a problem that the area around the eyelet where the black band was attached was torn and the eyelet itself fell off.
This is because stress concentrates on the small seal part (seal length or cross section) of the eyelet seal. As a countermeasure against this, it is also possible to reduce the mounting interval in the longitudinal direction to reduce the load per eyelet. It is conceivable that if the black bands are installed at small intervals, not only the above material costs and work time will increase, but there is also the problem of blocking sunlight from the cultivated crops such as grapes and pears, which impedes growth. It was

Further, at the time of the waste plastic treatment, since the black band and the film for tunnel are made of different materials, it is necessary to separate them.

[0006]

Therefore, according to the present invention, the material cost and the working cost are low, and the tunnel film can be securely fixed without hindering the growth of cultivated crops such as grapes and pears. An object of the present invention is to provide an agricultural film that does not require separation treatment during plastic treatment.

[0007]

The invention as set forth in claim 1 for solving the above-mentioned problems has a narrow reinforcing band at both end edges along the longitudinal direction of the film of a long polyolefin-based film, The agricultural film is characterized in that a film band having a width of 20 mm or more and 100 mm or less and a length of 20 cm or more and 50 cm or less is welded to the reinforcing band along the reinforcing band at intervals of 50 to 70 cm to form a welded portion.

According to a second aspect of the invention, there is provided the agricultural film according to the first aspect, wherein the non-welded portion of the film band is formed on both sides of the region of the welded portion.

The invention according to claim 3 is the agricultural film according to claim 1 or 2, wherein the width of the non-welded portion is 1 to 5 mm.

The invention as set forth in claim 4 is characterized in that the reinforcing band is formed by bending both ends of a long polyolefin film and inserting a vinyl acetate resin tape inside the bent width. The agricultural film according to claim 1, 2 or 3.

According to a fifth aspect of the present invention, the film band is a polyolefin stretched film having a width of 40 mm or more and less than 70 mm, and a welded portion has a width of 30 mm or more and 60 mm.
The agricultural film according to claim 1, 2, 3 or 4, characterized in that it is less than.

The invention according to claim 6 is the agricultural film according to claim 1, wherein the welded portion is formed by heat welding by a high frequency sealing method.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 shows an example of the agricultural film of the present invention. That is, 1 is a long polyolefin-based film, and narrow reinforcing bands 2 and 2 are formed at both end edges of the film 1 in the longitudinal direction (left-right direction in the drawing).

Examples of the polyolefin resin used for the polyolefin film include low density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and the like. .

The polyolefin film may be a single layer film of polyolefin or a laminated film.

The thickness of the film is preferably in the range of 30 to 100 μ, more preferably in the range of 40 to 70 μ in consideration of durability as a tunnel film.

The reinforcing band 2 can be formed by bending both ends of a long polyolefin film. The folding width is preferably in the range of 30 to 50 mm.

As shown in FIG. 2, the reinforcing band 2 is formed by bending both ends of a long polyolefin film and inserting a reinforcing tape 20 made of a material such as vinyl acetate resin into the bending width. It is preferable to enhance the convenience of welding of the film band and the strength maintaining effect after welding.

In FIG. 1, reference numeral 3 is a film band, and one end of the film band 3 is welded and fixed to a portion of the reinforcing band 2. 4 is a welded portion. The width L ₁ of the film band 3 may be 20 mm or more and 100 mm or less, and the length L ₂ may be 20 cm or more and 50 cm or less. Each of the plurality of film bands may have a slightly different width and length.

The distance L ₃ between the film band 3 and the adjacent film band 3 may be 50 to 70 cm, and may be equal or slightly different.

The film band 3 is more preferably a polyolefin-based stretched film having a width L ₁ of 40 mm or more and less than 70 mm, and further preferably a polyolefin-based multilayer film stretched in the longitudinal direction. For example, in the case of a film having a two-layer structure, the first layer may be a layer mainly composed of linear low-density polyethylene having a density of 0.930 g / cm ³ or less, high-pressure low-density polyethylene, or a mixture thereof. . The second layer is a layer mainly composed of polypropylene (ethylene content of 10% or less) or high density polyethylene.

In the present invention, it is preferable to have the non-welded portions 5 of the film band 3 on both sides of the region of the welded portion 4 (the portion shown by the diagonal lines in the drawing). Although the drawing shows an example in which the non-welded portion 5 is formed around the region of the welded portion 4, the present invention is not limited thereto.

By forming such a non-welded portion 5, it is possible to prevent the film band 3 from coming off or peeling from the reinforcing band 2 during use.

As shown in FIG. 1, when the entire width of the band is sealed, both ends A of the seal width L ₁ are thinned as a band and are scratched, which is a so-called notch effect (the notch effect is large at the outer end A part, B is small), and the strength is lowered.

Further, it is considered that the stretched band also has a notch effect due to a decrease in the stretching effect of the band due to heat at the pole portion A.

The relationship between the welded and non-welded regions will be described with reference to FIG. Length a1 of the welded portion 4, If the length of the non-welded portion 5 is a2, then a1 Is in the range of 30 to 60 mm, a
2 is preferably in the range of 1 to 5 mm in terms of strength and binding property as a string.

The width b of the welded portion 4 is preferably in the range of 7 to 15 mm, and it is preferable that the sealing strength in the width direction is increased on the side opposite to the band for binding, because the notch effect is softened.

In the present invention, the welded portion 4 is preferably formed by heat welding using a high frequency sealing method in order to improve workability.

FIG. 4 shows a state in which the agricultural film of the present invention is used. The tunnel film 1 is spread on the grape rack 10 and the like, and both sides of the tunnel film 1 are fixed by the film bands 3.

[0031]

According to the present invention, a width of 20 mm or more and 100
By forming a welded portion by welding a film band having a length of 20 mm or more and a length of 20 cm or more and 50 cm or less along the reinforcing band at intervals of 50 to 70 cm, material costs and work costs are low, and cultivated crops such as grapes and pears The film for tunnels can be securely fixed without hindering the growth of.

Further, by forming the non-welded portion of the film band on both sides of the area of the welded portion, there is an effect of softening the notch effect.

Further, when the width of the non-welded portion is 1 to 5 mm, the notch effect can be avoided and the binding workability as a string can be improved.

The reinforcing band has the following effects by bending both ends of a long polyolefin film and inserting a vinyl acetate resin tape inside the bending width. That is, the edge of the film is generally scratched.
Therefore, there is a notch effect that breaks from here. To prevent this, it is better not to fold it in, that is, to prevent scratches from appearing at the edges.

The film band has a width of 40 mm or more and 70 m
It is a polyolefin-based stretched film of less than m, and the width of the welded part is 30 mm or more and less than 60 mm, so the material cost and work cost are low, and it is for tunnels without hindering the growth of cultivated crops such as grapes and pears. Not only can the film be fixed securely, but it also eliminates the need for sorting during the waste plastic treatment.

Since the welded portion is formed by heat welding using the high frequency sealing method, it is possible to easily control the seal shape and the seal strength.

[Brief description of drawings]

FIG. 1 is an explanatory view of main parts showing an example of a film of the present invention.

FIG. 2 is a cross-sectional view showing a portion of a reinforcing band.

FIG. 3 is a diagram showing a relationship between a welded portion and a non-welded portion.

FIG. 4 is a perspective view of a main part showing a usage state of the film of the present invention.

FIG. 5 is an explanatory view of main parts showing a conventional example.

[Explanation of symbols]

1: Film 2: Reinforcement belt 20: Reinforcing tape 3: Film band 4: Welded part 5: Non-welded part 10: Grape shelf

Claims (6)

[Claims] 1. A long-shaped polyolefin-based film having narrow reinforcing bands on both edges along the longitudinal direction of the film, and the reinforcing band has a width of 20 mm or more and 100 mm or less and a length of 20 cm.
An agricultural film, characterized in that a film band having a size of 50 cm or less is welded along the reinforcing band at intervals of 50 to 70 cm to form a welded portion. 2. The agricultural film according to claim 1, wherein non-welded portions of the film band are formed on both sides of a region of the welded portion. 3. The agricultural film according to claim 1, wherein the non-welded portion has a width of 1 to 5 mm. 4. The reinforcing band is formed by bending both ends of a long polyolefin film and inserting a vinyl acetate resin tape inside the bent width. Agricultural film described. 5. A film band having a width of 40 mm or more and 70 m
A stretched polyolefin film having a length of less than m and a welded portion having a width of 30 mm or more and less than 60 mm, the agricultural film according to claim 1, 2, 3 or 4. 6. The welded portion is formed by heat welding using a high frequency sealing method.
The agricultural film according to 3, 4, or 5.