JP4498870B2 - Crop cover sheet - Google Patents
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- JP4498870B2 JP4498870B2 JP2004273375A JP2004273375A JP4498870B2 JP 4498870 B2 JP4498870 B2 JP 4498870B2 JP 2004273375 A JP2004273375 A JP 2004273375A JP 2004273375 A JP2004273375 A JP 2004273375A JP 4498870 B2 JP4498870 B2 JP 4498870B2
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Description
本発明は、収穫したジャガイモ、サツマイモ、甜菜などの根菜、葉菜、果菜等（収穫物）を野積み、運搬、仮貯蔵する際に、これらの収穫物を覆うために用いる収穫物被覆シートに関するものである。 The present invention relates to a harvest-coated sheet used to cover harvested potatoes, sweet potatoes, sugar beet, and other root vegetables, leaf vegetables, fruit vegetables, etc. (harvested products) when they are stacked, transported, and temporarily stored. Is.
従来、収穫したジャガイモ、サツマイモ、甜菜などの根菜、葉菜、果菜等の収穫物を野積み、運搬、仮貯蔵する際に、収穫物をシートで覆ったり、袋に収納したりしている。この際、被覆シートとしては、合成樹脂製のいわゆるビニールシートを用いることや、収納用としては、麻袋等の布製の袋などが使用されている。 Conventionally, when harvested crops such as root vegetables such as potatoes, sweet potatoes, and side dishes, leaf vegetables, and fruit vegetables are stacked, transported, and temporarily stored, the harvested products are covered with sheets or stored in bags. At this time, a so-called vinyl sheet made of synthetic resin is used as the covering sheet, and cloth bags such as hemp bags are used for storage.
しかしながら、ビニールシートは、防水性に優れるため降雨等による水の浸入を防止できるものの、収穫物から生じる水蒸気や二酸化炭素などのガスを放出することができないため、これらがビニールシート内に充満し、収穫物を腐らせる原因となる。また、ビニールシートは、遮光が十分でないためにジャガイモなどの場合、芽が出てきたり、緑色に変色したりして、商品価値が下がるという問題があった。一方、麻袋の場合は、防水性が十分でないために、雨水が浸入して商品価値が低下するという問題があり、また、遮光が十分でないため、ビニールシートと同様で収穫物より芽が出る等の商品価値が下がるという問題がある。 However, since the vinyl sheet is excellent in water resistance and can prevent water intrusion due to rain, etc., it cannot release the gas such as water vapor or carbon dioxide generated from the harvest, so these fill the vinyl sheet, Causes the crop to rot. Further, since the light shielding of the vinyl sheet is not sufficient, in the case of potatoes, there is a problem that the product value is lowered due to buds appearing or green color. On the other hand, in the case of hemp bags, there is a problem that rainwater infiltrates and product value decreases due to insufficient waterproofness, and because the light shielding is not enough, buds emerge from the harvest like the vinyl sheet. There is a problem that the product value of.
収穫物の品質等を保持できる被覆シートとして、特定の透湿度を有するシートが特許文献１に開示されているが、シート強度や遮光性については言及したものではない。
本発明は、防水性、通気性に優れ、収穫物の商品価値、品質を維持することが可能な収穫物被覆シートを提供することを課題とするものである。 An object of the present invention is to provide a harvest-coated sheet that is excellent in waterproofness and air permeability and can maintain the commercial value and quality of the harvest.
本発明者らは、上記課題を達成すべく鋭意検討した結果、本発明に到達した。 As a result of intensive studies to achieve the above-mentioned problems, the present inventors have reached the present invention.
すなわち、本発明は、収穫物を覆うために用いる収穫物被覆シートであって、
シートの表裏両面はスパンボンド不織布によって構成され、内層に微多孔性フィルムが存在しており、
スパンボンド不織布が、芯部がポリエステルで鞘部がポリエチレンで構成され、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向および繊維周方向において不均一で且つ無作為に変化している芯鞘状複合繊維を構成繊維とする不織布であり、
微多孔性フィルムが、スパンボンド不織布を構成する芯鞘状複合繊維の鞘部であるポリエチレンの融点よりも高い融点を有するポリエチレンからなり、
スパンボンド不織布と微多孔フィルムとが、スパンボンド不織布を構成する芯鞘状複合繊維の鞘部が軟化または溶融することによって貼り合わされ、
収穫物を覆う際には、スパンボンド不織布を収穫物に当接させて用いることを特徴とする収穫物被覆シートを要旨とするものである。
That is, the present invention is a crop covering sheet used to cover the crop,
Both front and back sides of the sheet are composed of spunbond nonwoven fabric, and a microporous film exists in the inner layer .
The spunbonded nonwoven fabric has a core part made of polyester and a sheath part made of polyethylene. The cross-sectional shape of the core part does not substantially change in the fiber axis direction, and the thickness of the sheath part is the fiber axis direction and the fiber circumferential direction. Is a non-woven fabric comprising a core-sheath composite fiber that is non-uniform and randomly changing in a constituent fiber,
The microporous film is made of polyethylene having a melting point higher than that of polyethylene, which is the sheath part of the core-sheath composite fiber constituting the spunbond nonwoven fabric,
The spunbond nonwoven fabric and the microporous film are bonded together by softening or melting the sheath portion of the core-sheath composite fiber constituting the spunbond nonwoven fabric,
The gist of the crop-covered sheet is characterized by using a spunbonded nonwoven fabric in contact with the crop when the crop is covered.
以下、本発明について詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明の収穫物被覆シートは、表裏両面はスパンボンド不織布によって構成されている。シートの表裏両面を構成するスパンボンド不織布は、シートの機械的強力を担い、また、収穫物への日光の照射を遮る働きをする。また、内層の微多孔性フィルムが直に外部のものや収穫物と接することを防止し、微多孔性フィルムおよび収穫物の両方を保護する働きも担っている。 As for the crop covering sheet of this invention, both front and back are comprised with the spun bond nonwoven fabric. The spunbonded nonwoven fabric constituting both the front and back sides of the sheet bears the mechanical strength of the sheet and functions to block the irradiation of sunlight on the harvest. In addition, the microporous film of the inner layer is prevented from coming into direct contact with an external one or a harvested product, and has a function of protecting both the microporous film and the harvested product.
スパンボンド不織布の形態としては、部分的に熱圧着が施されてなるものが好ましい。機械的強力に優れるためである。 As the form of the spunbonded nonwoven fabric, one that is partially subjected to thermocompression bonding is preferable. This is because the mechanical strength is excellent.
本発明の収穫物被覆シートの表裏両面を構成するスパンボンド不織布の目付としては、収穫物被覆シートの強度、通気性や遮光性を考慮して表裏の目付の合計が２５〜２００ｇ／ｍ2とすることが好ましい。表裏の目付の合計が２５ｇ／ｍ2未満であると、シートの強度が低くなり破れやすく、収穫物を被覆、保護するという本発明の目的を達成しにくい。また、シートに腰がないため作業性にも劣る傾向となる。また、遮光性を要する収穫物には、十分な遮光ができない傾向となる。一方、表裏の目付の合計が２００ｇ／ｍ2を超えると、過剰品質となり、コスト的に不利である。また、表裏の一方の目付としては、１０〜１８０ｇ／ｍ2程度がよい。 As the basis weight of the spunbonded nonwoven fabric constituting both the front and back sides of the harvest-coated sheet of the present invention, the total weight of the front and back sides is 25 to 200 g / m 2 in consideration of the strength, breathability and light shielding properties of the harvest-coated sheet. It is preferable to do. When the total weight of the front and back is less than 25 g / m 2 , the strength of the sheet is low and the sheet is easily broken, and it is difficult to achieve the object of the present invention to cover and protect the crop. Moreover, since the seat is not low, workability tends to be inferior. In addition, there is a tendency that a sufficient amount of light cannot be shielded from harvested products that require light shielding. On the other hand, if the total weight of the front and back exceeds 200 g / m 2 , the quality becomes excessive and disadvantageous in terms of cost. Further, as one of the basis weight of the front and back, it is about 10 to 180 g / m 2.
本発明の収穫物被覆シートの内層には、微多孔性フィルムが存在する。微多孔性フィルムは、気体、水蒸気等は通すが、水は通さない程度の小孔を多数有する微多孔構造を有し、公知のフィルムを用いることができる。例えば、無機充填剤、有機充填剤などを含有するフィルムより該充填剤を溶剤で溶出して製造する微多孔性フィルムや、無機充填剤、有機充填剤を含有する重合体からなるシートを少なくとも１軸方向に延伸して微多孔構造を形成させて得る微多孔性フィルム等を用いることができる。また、微多孔性フィルムの素材としては、スパンボンド不織布を構成する芯鞘状複合繊維の鞘部であるポリエチレンの融点よりも高い融点を有するポリエチレン製の微多孔性フィルムを用いる。 A microporous film exists in the inner layer of the harvest-coated sheet of the present invention. The microporous film has a microporous structure having a large number of small holes that allow gas, water vapor, and the like to pass therethrough but does not allow water to pass through, and a known film can be used. For example, at least one sheet of a microporous film produced by eluting the filler with a solvent from a film containing an inorganic filler, an organic filler, or the like, or a sheet made of a polymer containing an inorganic filler or an organic filler is used. A microporous film obtained by stretching in the axial direction to form a microporous structure can be used. Moreover, as a raw material of a microporous film, the microporous film made from polyethylene which has melting | fusing point higher than the melting | fusing point of polyethylene which is the sheath part of the core-sheath-like composite fiber which comprises a spun bond nonwoven fabric is used .
微多孔性フィルムの厚みは、１０〜２００μｍが好ましく、より好ましくは１５〜１００μｍの範囲である。このフィルムの透湿度は、４０００〜８０００ｇ／ｍ2・２４時間の範囲のものが好ましい。これらの特性を満足するためには、平均径が０．１〜５０μｍの微細孔を有し、空隙率が１０〜６０％程度であることが望ましい。この微多孔性フィルムのフィルム厚み、透気度、耐水圧は、被覆する収穫物の種類、貯蔵状態、被覆状態、被覆方法等に応じて適宜決定すればよい。 The thickness of the microporous film is preferably 10 to 200 μm, more preferably 15 to 100 μm. The moisture permeability of this film is preferably in the range of 4000 to 8000 g / m 2 · 24 hours. In order to satisfy these characteristics, it is desirable to have fine pores with an average diameter of 0.1 to 50 μm and a porosity of about 10 to 60%. The film thickness, air permeability, and water pressure resistance of the microporous film may be appropriately determined according to the type of harvested product to be coated, the storage state, the covering state, the covering method, and the like.
本発明の収穫物被覆用シートは、前記スパンボンド不織布と微多孔性フィルムとが積層されることにより一体化している。 The harvest-covering sheet of the present invention is integrated by laminating the spunbond nonwoven fabric and the microporous film .
スパンボンド不織布と微多孔性フィルムとを積層する方法として、スパンボンド不織布の構成繊維の鞘部を溶融または軟化させて、熱接着により積層する。その際は、微多孔性フィルムを構成している重合体の融点は、スパンボンド不織布の構成繊維であって、熱接着する際の接着成分となる鞘部の重合体の融点よりも高い。スパンボンド不織布と微多孔性フィルムを積層する際に、スパンボンド不織布を構成している繊維の鞘部を溶融または軟化させることによって行うが、接着成分となる鞘部の重合体と微多孔性フィルムの融点が同じであると貼合の際に熱の影響を受けて、フィルムが熱収縮、変形などを起こしやすく、その結果、微多孔構造を備えた状態で良好に貼合しにくい傾向となるためである。熱接着により積層する具体的な方法としては、熱ロールや熱風などの熱処理により、スパンボンド不織布を構成する重合体であって接着成分となる鞘部の重合体を溶融または軟化させ、次いで微多孔性ポリエチレンフィルムを積層し、必要に応じて、熱や圧力などをかけて両者を融着一体化させて本発明の収穫物被覆用シートを得る。 As a method for laminating a scan Panbondo nonwoven fabric and the microporous film, with the sheath of the fibers constituting spun-bonded nonwoven fabric are melted or softened, is laminated by heat bonding. In that case, the melting point of the polymer constituting the microporous film is a constituent fiber of the spunbonded nonwoven fabric, and is higher than the melting point of the polymer in the sheath portion that becomes an adhesive component when thermally bonded. When stacking the spunbonded nonwoven fabric and microporous film, it is carried out by melting or softening the sheath of the fibers constituting the spun-bonded nonwoven fabric, the sheath comprising an adhesive component polymer and the microporous film If the melting points of the films are the same, the film is susceptible to heat during bonding, and the film tends to shrink, deform, etc., and as a result, it tends to be difficult to bond well with a microporous structure. Because. As a specific method of laminating by thermal bonding, the polymer of the sheath part , which is a polymer constituting the spunbond nonwoven fabric and serves as an adhesive component, is melted or softened by heat treatment such as a hot roll or hot air, and then microporous. The sheet for covering a harvested product of the present invention is obtained by laminating a conductive polyethylene film and, if necessary, applying heat and pressure to fuse and integrate them.
本発明においては、スパンボンド不織布としては、特開２００４−１３７６２６号公報に記載の芯部がポリエステルで鞘部がポリエチレンで構成され、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化している芯鞘状複合繊維を構成繊維とするスパンボンド不織布を使用する。そして、微多孔性フィルムとしては、前記スパンボンド不織布を構成する芯鞘状複合繊維の鞘部であるポリエチレンの融点よりも高い融点を有するポリエチレンからなるものを使用する。そして、熱ロールや熱風などの熱処理により、スパンボンド不織布の構成繊維の鞘部のポリエチレンを溶融または軟化させ、次いで微多孔性ポリエチレンフィルムを積層し、必要に応じて、熱や圧力などをかけて両者を融着一体化させる。この実施態様によれば、スパンボンド不織布を構成している繊維が、芯鞘状複合繊維であり、接着成分として機能する鞘部が繊維軸方向及び断面周方向に不規則な凹凸を有しているので、微多孔性ポリエチレンフィルムとの貼り合わせの際、面的に接着するのではなく、主として鞘部の凸部とフィルムとが点で接着し、溶融または軟化した鞘部よりフィルムが受ける熱の影響が少なくなるため、微多孔構造を保持した状態で良好に貼合できる。そして、得られる収穫物被覆用シートは、気体、水蒸気等は通すが、水は通さないという微多孔性ポリエチレンフィルムの性能を保持し、また、スパンボンド不織布により補強されているため、機械的強度に優れ、また適度な耐水圧をも保持するものとなる。
In the present invention, the scan Panbondo nonwoven sheath in polyester core described in JP-A-2004-137626 is composed of polyethylene, cross-sectional shape of the core portion is substantially unchanged in the fiber axis direction The thickness of the sheath portion is a spunbonded nonwoven fabric having core-sheath composite fibers that are nonuniform and randomly changing in the fiber axis direction and the fiber circumferential direction. And as a microporous film, what consists of polyethylene which has melting | fusing point higher than the melting | fusing point of polyethylene which is the sheath part of the core-sheath-like composite fiber which comprises the said spun bond nonwoven fabric is used. And by heat treatment such as hot rolls and hot air, the polyethylene of the sheath part of the spunbond nonwoven fabric is melted or softened, then a microporous polyethylene film is laminated, and heat or pressure is applied as necessary. Both are fused and integrated. According to this embodiment, the fiber constituting the spunbond nonwoven fabric is a core-sheath composite fiber, and the sheath part that functions as an adhesive component has irregular irregularities in the fiber axis direction and the cross-sectional circumferential direction. Therefore, when bonding with the microporous polyethylene film, the heat received by the film from the melted or softened sheath is mainly due to the point where the convex portion of the sheath adheres to the film at the point, instead of adhering to the surface. Therefore, it can be satisfactorily bonded while maintaining a microporous structure. The resulting harvest coating sheet retains the performance of a microporous polyethylene film that allows gas, water vapor, etc. to pass but not water, and is reinforced with a spunbonded nonwoven fabric, so it has mechanical strength. In addition, it can maintain a suitable water pressure resistance.
本発明の収穫物被覆シートは、上記したようにスパンボンド不織布／微多孔性フィルム／スパンボンド不織布と積層されてなるものであるが、さらに、本発明の目的を達成する範囲において、フィルムスリットヤーンからなる粗めの織物を積層する、経方向および／または緯方向に糸条を積層する、あるいは、これらを組み合わせる等により収穫物被覆シートの強度等を向上させることができる。 The harvest-covered sheet of the present invention is formed by laminating a spunbond nonwoven fabric / microporous film / spunbond nonwoven fabric as described above, and further within the range of achieving the object of the present invention, a film slit yarn. The strength and the like of the harvest-coated sheet can be improved by laminating a coarse woven fabric made of, laminating yarns in the warp direction and / or weft direction, or combining them.
収穫物被覆シートの表裏面を構成するスパンボンド不織布には、被覆する収穫物や被覆状態などに応じて、適宜の着色を行ってもよい。例えば、より遮光性を要する場合は、表裏の少なくとも一方を黒色などの濃色に着色することが好ましい。また、表側（外部側）を白色とし、裏側（収穫物に接する側）を黒色などの濃色としてもよい。表側を白にすることにより、外部の光を反射しやすくし、また、裏側を黒色とすることで、暗い状態をつくりだし日焼けを嫌う収穫物を光から保護することが期待できる。スパンボンド不織布に着色する方法としては、印刷、染色、繊維を構成する重合体に顔料を添加した原着などの中から任意に選択することができる。 The spunbonded nonwoven fabric constituting the front and back surfaces of the crop-covered sheet may be appropriately colored depending on the crop to be coated, the covering state, and the like. For example, when more light shielding is required, it is preferable to color at least one of the front and back surfaces in a dark color such as black. Alternatively, the front side (external side) may be white and the back side (side in contact with the harvest) may be a dark color such as black. By making the front side white, it is easy to reflect outside light, and by making the back side black, it can be expected to protect the crops that create a dark state and hate sunburn from light. As a method for coloring the spunbonded nonwoven fabric, it can be arbitrarily selected from printing, dyeing, and original material obtained by adding a pigment to the polymer constituting the fiber.
本発明の収穫物被覆シートは、上記した構成のものであるが、使用の際には、布帛の形態で収穫物に被覆してもよく、また、コンテナ等の被覆するものに応じた形状に縫製等して、被覆カバーとして用いてもよい。また、袋状に縫製等して使用してもよい。また、使用の仕方に応じて、より強度を要する場合は、本発明の収穫物被覆カバーの端部周辺を他の布等により補強を行ったり、ハトメ処理等を行ってもよい。 The harvest-covered sheet of the present invention has the above-described configuration, but in use, the harvest-covered sheet may be coated on the harvest in the form of a fabric, or in a shape according to what is covered such as a container. It may be used as a covering cover by sewing or the like. Further, it may be used by sewing in a bag shape. In addition, depending on how to use, if more strength is required, the periphery of the end portion of the harvested covering cover of the present invention may be reinforced with another cloth, or eyelet processing may be performed.
本発明の収穫物被覆シートは、微多孔性フィルムを内層にし、表裏両面がスパンボンド不織布により構成されている。すなわち、気体、水蒸気等は通すが、水は通さない程度の小孔を多数有する微多孔構造を有する微多孔性フィルムと、微多孔性フィルムの表裏に積層したスパンボンド不織布とからなる収穫物被覆シートにより、収穫物を被覆するため、収穫物より発生する水蒸気や二酸化炭素などを十分に外部に放出することができ、また、外部からは雨などが収穫物被覆シートを通じて浸入することを防ぐことができる。したがって、貯蔵している収穫物などの腐敗、鮮度低下など、商品価値の低下を防止し、品質を保持することができる。 The harvest-covered sheet of the present invention has a microporous film as an inner layer, and both front and back surfaces are composed of a spunbond nonwoven fabric. That is, a crop cover comprising a microporous film having a microporous structure having a large number of small pores that allow gas, water vapor, etc. to pass through, and a spunbonded nonwoven fabric laminated on the front and back of the microporous film. Since the crop is covered with the sheet, water vapor, carbon dioxide, etc. generated from the crop can be released to the outside sufficiently, and rain etc. can be prevented from entering from the outside through the crop-covered sheet. Can do. Accordingly, it is possible to prevent deterioration in commercial value such as decay of stored harvests and the like, and decrease in freshness, and to maintain quality.
また、微多孔性フィルムの表裏にスパンボンド不織布が積層されているため、収穫物被覆シートの機械的強度が向上する。また、スパンボンド不織布は、微多孔性フィルムを保護する役割も担うこととなり、外部からの物等が微多孔性フィルムに当たることを防ぎ、微多孔性フィルムシートの耐久性が向上し、しいては、収穫物被覆シートの耐久性も向上する。また、同様に、収穫物が直に微多孔性フィルムに当接しにくく、繊維からなる柔軟なスパンボンド不織布が当接することとなるので、収穫物および微多孔性フィルムを共に傷つけにくいという効果も奏する。 Moreover, since the spunbonded nonwoven fabric is laminated on the front and back of the microporous film, the mechanical strength of the crop-covered sheet is improved. In addition, the spunbond nonwoven fabric will also play a role in protecting the microporous film, preventing external objects from hitting the microporous film, improving the durability of the microporous film sheet, Also, the durability of the crop-covered sheet is improved. Similarly, since the harvested product is less likely to come into direct contact with the microporous film and a flexible spunbond nonwoven fabric made of fibers is brought into contact, the harvested product and the microporous film are both less likely to be damaged. .
次に、実施例により本発明を具体的に説明する。なお、本発明はこれらの実施例によって何ら限定されるものではない。また、実施例における各特性値は、以下のようにして求めたものである。
（１）ポリエステルの極限粘度〔η〕：フェノールと四塩化エタンとの等質量混合溶媒１００ｃｃに試料０．５ｇを溶解し、温度２０℃の条件で測定した。
（２）融点（℃）：パーキンエルマー社製の示差走査熱量計ＤＳＣ−７型を用い、昇温速度２０℃／分で測定した。
（３）ポリエチレンのメルトフローレート（ｇ／１０分）：ＪＩＳ Ｋ ６９２２に記載の方法により、温度１９０℃、荷重２１．１８Ｎの条件で測定した。
（４）透湿度：ＪＩＳ Ｚ ０２０８に準じて測定した。
（５）耐水圧：ＪＩＳ Ｌ １０９２ 低水圧法に準じて測定した。
（６）遮光率：一面が開いている立方体型のボックス（２０ｃｍ×２０ｃｍ×２０ｃｍ）の開いている面と対向する面に受光部（照度計）が設置してなる照度測定器に、開いている面に光源（２０００ｌｘ）を設置し、照度を測定する（ブランク）。次いで、試料（２５ｃｍ×２５ｃｍ）を、開いている面に取り付け、同様に照度を測定し、下記式より遮光率を算出した。試料数は３個とし、３個の平均値より遮光率を算出した。
遮光率（％）＝［（ブランクの照度）−（試料の照度）］×１００／（ブランクの照度）
Next, the present invention will be described specifically by way of examples. In addition, this invention is not limited at all by these Examples. The characteristic values in the examples are obtained as follows.
(1) Intrinsic viscosity [η] of polyester: 0.5 g of a sample was dissolved in 100 cc of a mixed solvent of equal mass of phenol and ethane tetrachloride and measured at a temperature of 20 ° C.
(2) Melting point (° C.): Measured using a differential scanning calorimeter DSC-7 type manufactured by Perkin Elmer Co., Ltd. at a heating rate of 20 ° C./min.
(3) Polyethylene melt flow rate (g / 10 min): Measured by the method described in JIS K 6922 under conditions of a temperature of 190 ° C. and a load of 21.18 N.
(4) Moisture permeability: Measured according to JIS Z 0208.
(5) Water pressure resistance: Measured according to JIS L 1092 low water pressure method.
(6) Light shielding rate: Open to an illuminance measuring instrument in which a light receiving unit (illuminance meter) is installed on the surface facing the open surface of a cubic box (20 cm × 20 cm × 20 cm) whose one surface is open. A light source (2000 lx) is installed on the surface where the light is present, and the illuminance is measured (blank). Next, a sample (25 cm × 25 cm) was attached to the open surface, the illuminance was measured in the same manner, and the light shielding rate was calculated from the following formula. The number of samples was three, and the shading rate was calculated from the average value of the three samples.
Light blocking ratio (%) = [(blank illuminance) − (sample illuminance)] × 100 / (blank illuminance)
実施例１
スパンボンド不織布として、極限粘度〔η〕０．７０、融点２６０℃のポリエチレンテレフタレートが芯部に配され、メルトフローレート１８ｇ／１０分、密度０．９１３ｇ／ｃｃ、融点１０４℃のポリエチレン（メタロセン系重合触媒により得られた、メルトフローレート２８ｇ／１０分、密度０．９０６ｇ／ｃｃ、融点９７℃の第一ポリエチレン４０重量部と、チグラーナッタ系重合触媒により得られた、メルトフローレート１４ｇ／１０分、密度０．９１８ｇ／ｃｃ、融点１０６℃の第二ポリエチレン６０重量部との混合物）が配されてなり、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向及び繊維周方向において不均一で且つ無作為に変化している芯鞘状複合繊維を構成繊維とする黒色原着のスパンボンド不織布を用意した。このスパンボンド不織布は、目付５０ｇ／ｍ2、部分的に熱圧着されてなるものである。
Example 1
As a spunbonded nonwoven fabric, polyethylene terephthalate having an intrinsic viscosity [η] of 0.70 and a melting point of 260 ° C. is disposed in the core, and a polyethylene having a melt flow rate of 18 g / 10 minutes, a density of 0.913 g / cc, and a melting point of 104 ° C. A melt flow rate of 28 g / 10 minutes obtained by a polymerization catalyst, a density of 0.906 g / cc, 40 parts by weight of a first polyethylene having a melting point of 97 ° C., and a melt flow rate of 14 g / 10 minutes obtained by a Ziegler-Natta polymerization catalyst. , A density of 0.918 g / cc, and a mixture of 60 parts by weight of second polyethylene having a melting point of 106 ° C.), and the cross-sectional shape of the core part does not substantially change in the fiber axis direction, and the thickness of the sheath part This is because of the black original material comprising the core-sheath composite fiber that is nonuniform and randomly changing in the fiber axis direction and the fiber circumferential direction. It was prepared Panbondo non-woven fabric. This spunbonded nonwoven fabric has a basis weight of 50 g / m 2 and is partly thermocompression bonded.
一方、微多孔性収穫物被覆シートの強度等を向上させるために、フィルムとしては、微多孔性ポリエチレンフィルム４５μｍ（トクヤマ社製 商品名「ポーラム」融点１２５℃）を用意した。用意した微多孔性フィルムの透湿度は、６０００ｇ／ｍ2・２４時間である。 On the other hand, in order to improve the strength and the like of the microporous crop-coated sheet, a microporous polyethylene film 45 μm (trade name “Porum” melting point 125 ° C. manufactured by Tokuyama Corporation) was prepared as a film. The moisture permeability of the prepared microporous film is 6000 g / m 2 · 24 hours.
前記スパンボンド不織布／微多孔性ポリエチレンフィルム／スパンボンド不織布の順に積層し、一対のカレンダーローラーにＳ字掛けに通して、ロール温度１２０℃、線圧２ｋｇ／ｃｍの条件で熱処理して積層一体化し、本発明の収穫物被覆用シートを得た。得られた収穫物被覆用シートは、透湿度５９５３ｇ／ｍ2・２４時間、耐水圧２００ｃｍ以上、遮光率１００％であった。 The spunbond nonwoven fabric / microporous polyethylene film / spunbond nonwoven fabric are laminated in this order, passed through a pair of calender rollers in an S-shape, and heat treated under the conditions of a roll temperature of 120 ° C. and a linear pressure of 2 kg / cm for lamination and integration. Thus, a sheet for covering a harvested product of the present invention was obtained. The obtained crop-covering sheet had a moisture permeability of 5953 g / m 2 · 24 hours, a water pressure resistance of 200 cm or more, and a light shielding rate of 100%.
実施例２
実施例１で用いた黒原着のスパンボンド不織布、微多孔性ポリエチレンフィルムを用意し、また、ポリエチレン製ワリフ（セキスイフィルム社製 商品名「ソフＨＮ６６」）を用意した。スパンボンド不織布／微多孔性ポリエチレンフィルム／ポリエチレン製ワリフ／スパンボンド不織布の順に積層し、一対のカレンダーローラーにＳ字掛けに通して、ロール温度１２０℃、線圧２ｋｇ／ｃｍの条件で熱処理して積層一体化し、本発明の収穫物被覆用シートを得た。得られた収穫物被覆用シートは、透湿度４６０８ｇ／ｍ2・２４時間、耐水圧２００ｃｍ以上、遮光率１００％であった。また、手で実施例１のシートより、さらに強度の高いものであった。
Example 2
A black bonded spunbond nonwoven fabric and a microporous polyethylene film used in Example 1 were prepared, and a polyethylene burif (trade name “SOF HN66” manufactured by Sekisui Film Co., Ltd.) was prepared. Spunbond nonwoven fabric / microporous polyethylene film / polyethylene walliff / spunbond nonwoven fabric are laminated in this order, passed through a pair of calender rollers, and subjected to heat treatment under conditions of roll temperature of 120 ° C. and linear pressure of 2 kg / cm. The sheets were laminated and integrated to obtain the harvest coating sheet of the present invention. The obtained crop-covering sheet had a moisture permeability of 4608 g / m 2 · 24 hours, a water pressure resistance of 200 cm or more, and a light shielding rate of 100%. Further, it was stronger than the sheet of Example 1 by hand.
実施例３
実施例１で用いた黒原着のスパンボンド不織布、微多孔性ポリエチレンフィルムを用意した。また、上記スパンボンド不織布において、原着していないこと、目付が４０ｇ／ｍ2であること以外は同様の白色のスパンボンド不織布も用意した。
黒原着のスパンボンド不織布／微多孔性ポリエチレンフィルム／白色のスパンボンド不織布の順に積層し、一対のカレンダーローラーにＳ字掛けに通して、ロール温度１２０℃、線圧２ｋｇ／ｃｍの条件で熱処理して積層一体化し、本発明の収穫物被覆用シートを得た。得られた収穫物被覆用シートは、透湿度５３７６ｇ／ｍ2・時間、耐水圧２００ｃｍ以上、遮光率９９％であった。なお、遮光率を測定する際、光源側は、白色スパンボンド不織布側とした。
Example 3
The black original spunbond nonwoven fabric and microporous polyethylene film used in Example 1 were prepared. In the above spunbonded nonwoven fabric, it is not dyed, basis weight was prepared a similar white spunbonded nonwoven except that the 40 g / m 2.
Laminated black spunbond non-woven fabric / microporous polyethylene film / white spunbond non-woven fabric in this order, passed through a pair of calender rollers, S-curved, and heat-treated at a roll temperature of 120 ° C. and a linear pressure of 2 kg / cm. Then, the sheets were laminated and integrated to obtain the harvested covering sheet of the present invention. The obtained harvest coating sheet had a moisture permeability of 5376 g / m 2 · hour, a water pressure resistance of 200 cm or more, and a light shielding rate of 99%. When measuring the light shielding rate, the light source side was the white spunbond nonwoven fabric side.
Claims (1)
シートの表裏両面はスパンボンド不織布によって構成され、内層に微多孔性フィルムが存在しており、
スパンボンド不織布が、芯部がポリエステルで鞘部がポリエチレンで構成され、芯部の横断面形状は繊維軸方向において実質的に変化せず、鞘部の厚さは、繊維軸方向および繊維周方向において不均一で且つ無作為に変化している芯鞘状複合繊維を構成繊維とする不織布であり、
微多孔性フィルムが、スパンボンド不織布を構成する芯鞘状複合繊維の鞘部であるポリエチレンの融点よりも高い融点を有するポリエチレンからなり、
スパンボンド不織布と微多孔フィルムとが、スパンボンド不織布を構成する芯鞘状複合繊維の鞘部が軟化または溶融することによって貼り合わされ、
収穫物を覆う際には、スパンボンド不織布を収穫物に当接させて用いることを特徴とする収穫物被覆シート。 A crop covering sheet used to cover the crop,
Both front and back sides of the sheet are composed of spunbond nonwoven fabric, and a microporous film exists in the inner layer .
The spunbonded nonwoven fabric has a core part made of polyester and a sheath part made of polyethylene. The cross-sectional shape of the core part does not substantially change in the fiber axis direction, and the thickness of the sheath part is the fiber axis direction and the fiber circumferential direction. Is a non-woven fabric comprising a core-sheath composite fiber that is non-uniform and randomly changing in a constituent fiber,
The microporous film is made of polyethylene having a melting point higher than that of polyethylene, which is the sheath part of the core-sheath composite fiber constituting the spunbond nonwoven fabric,
The spunbond nonwoven fabric and the microporous film are bonded together by softening or melting the sheath portion of the core-sheath composite fiber constituting the spunbond nonwoven fabric,
A crop- covered sheet comprising a spunbond nonwoven fabric in contact with a crop when the crop is covered.
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| JP2008254790A (en) * | 2007-04-06 | 2008-10-23 | Unitika Ltd | Crop covering sheet, and method for storing crop |
| MY182299A (en) * | 2012-12-28 | 2021-01-18 | Shubham Chandra | Breathable container for fruits and vegetables |
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| JPH0471837A (en) * | 1990-07-13 | 1992-03-06 | Asahi Chem Ind Co Ltd | Gas-permeable composite sheet |
| JPH06125751A (en) * | 1991-01-28 | 1994-05-10 | Nitto Denko Corp | Porous sheet for food-packaging |
| JPH07227153A (en) * | 1994-02-17 | 1995-08-29 | Mitsubishi Chem Corp | High-ridge fruit plant cultivation method |
| JP2000263705A (en) * | 1999-03-12 | 2000-09-26 | Seiji Kagawa | Freshness retaining film and air-permeable film |
| JP2004137626A (en) * | 2002-10-17 | 2004-05-13 | Unitika Ltd | Nonwoven fabric composed of core-sheath conjugate fiber and method for producing the same |
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| JPH0471837A (en) * | 1990-07-13 | 1992-03-06 | Asahi Chem Ind Co Ltd | Gas-permeable composite sheet |
| JPH06125751A (en) * | 1991-01-28 | 1994-05-10 | Nitto Denko Corp | Porous sheet for food-packaging |
| JPH07227153A (en) * | 1994-02-17 | 1995-08-29 | Mitsubishi Chem Corp | High-ridge fruit plant cultivation method |
| JP2000263705A (en) * | 1999-03-12 | 2000-09-26 | Seiji Kagawa | Freshness retaining film and air-permeable film |
| JP2004137626A (en) * | 2002-10-17 | 2004-05-13 | Unitika Ltd | Nonwoven fabric composed of core-sheath conjugate fiber and method for producing the same |
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