JP2645300B2 - Agricultural nonwoven - Google Patents
Agricultural nonwovenInfo
- Publication number
- JP2645300B2 JP2645300B2 JP62116575A JP11657587A JP2645300B2 JP 2645300 B2 JP2645300 B2 JP 2645300B2 JP 62116575 A JP62116575 A JP 62116575A JP 11657587 A JP11657587 A JP 11657587A JP 2645300 B2 JP2645300 B2 JP 2645300B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- mesh
- synthetic resin
- split
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/14—Measures for saving energy, e.g. in green houses
Landscapes
- Nonwoven Fabrics (AREA)
- Woven Fabrics (AREA)
- Protection Of Plants (AREA)
- Greenhouses (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は保温性、除湿性、無滴性にすぐれ、かつ、安
価な農業用不織布に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an inexpensive agricultural nonwoven fabric which is excellent in heat retention, dehumidification, and driplessness.
＜従来技術＞ 従来より、農業用不織布（以後ワリフと略す）とし
て、たとえば熱処理−ポリビニルアルコール合成樹脂
皮膜を用いたもの（鐘紡（株）商品名：タフベル ）、
融点の異なる２種類のポリエチレンを原料とし、延伸
した疎水性網目体を積層したもの（日石石油化学（株）
商品名：日石ワリフ）、ポリエステル系のワリフ（ユ
ニチカ（株）商品名：ラブシート）が、農業用被覆剤と
して、トンネル、ハウス、内張カーテンなどに広く使用
されている。<Prior art> Conventionally, non-woven fabric for agriculture (hereinafter abbreviated as “warif”)
For example, heat treatment-polyvinyl alcohol synthetic resin
Using a film (Kanebo Co., Ltd. product name: Tough Bell) ),
Stretching using two types of polyethylene with different melting points as raw materials
Of laminated hydrophobic networks (Nisseki Petrochemical Co., Ltd.)
Product Name: Nisseki Warifu, Polyester Warifu
(Nichika Corporation: Love Sheet)
Widely used for tunnels, houses, lining curtains, etc.
Have been.
しかしながら、の熱処理ポリビニルアルコール合成
樹脂皮膜を用いたワリフは、作物の生育に必要な保温
性、除湿性、無滴性にすぐれているが、高価であり、特
殊な作物に利用されているにすぎない。However, warifu using a heat-treated polyvinyl alcohol synthetic resin film is excellent in heat retention, dehumidification, and drip-free properties necessary for growing crops, but is expensive and is used only for special crops. Absent.
またおよびのワリフは、ポリエチレン系やポリエ
ステル系を原料にするため、きわめて安価に製造できる
が、いずれも原料となる樹脂は疎水性のため、のポリ
ビニルアルコール系のワリフと異なり保温性、除湿性お
よび無滴性の点でかなり劣っている。Since the warifu is made of polyethylene or polyester, it can be produced at very low cost.However, since the resin used as the raw material is hydrophobic, the heat retention, dehumidifying property and Significantly inferior in driplessness.
〈発明が解決しようとする問題点〉 前述したように、今だにワリフとして、性能と価格の
点で十分満足できるものがないのが現状である。<Problems to be Solved by the Invention> As described above, at present, there is no warif that can be sufficiently satisfied in terms of performance and price.
このようなことから、本発明者は、保温性、除湿性、
無滴性にすぐれ、かつ安価なワリフを提供するため鋭意
研究を重ねた結果、吸水性皮膜体と網目体とを積層一体
化してなるワリフが従来のものに比べ、極めて効果的で
ある事を見出し、本発明に至った。From such a thing, the present inventor, heat retention, dehumidification,
As a result of intensive studies to provide an inexpensive and inexpensive WARIF, we have found that a WARIF made by laminating and integrating a water-absorbing film and a mesh is significantly more effective than conventional ones. Heading, and led to the present invention.
〈問題点を解決するための手段〉 すなわち本発明は、高吸水性樹脂を含有する合成樹脂
からなる吸水性皮膜体層と非吸水性の合成樹脂層とを積
層一体化し、その積層一体化されたものを割繊し、それ
を経緯積層して熱融着してなり、上記非吸水性の合成樹
脂から形成される網目体が、その網状空隙を残して上記
吸水性皮膜体で覆われた構造のワリフを提供するもので
ある。<Means for solving the problems> That is, the present invention is to laminate and integrate a water-absorbing film layer made of a synthetic resin containing a highly water-absorbent resin and a non-water-absorbing synthetic resin layer, and the laminate is integrated. The fiber is split, and then laminated and thermally laminated to form a mesh formed from the non-water-absorbing synthetic resin, which is covered with the water-absorbing film except for the net-like voids. It is intended to provide a structured warifu.
つぎに、本発明の吸水性皮膜体の製造に用いられる合
成樹脂はたとえば、「ポリオレフィン」「ポリエステ
ル」「アクリル系樹脂」「ポリ塩化ビニル」「ナイロ
ン」「エチレン−酢酸ビニル共重合体」などが挙げられ
るが、高吸水性樹脂との相溶性、接着性、安価な点で、
高密度ポリエチレン、低密度ポリエチレンおよびエチレ
ン−酢酸ビニル共重合体が好適である。Next, synthetic resins used for producing the water-absorbing film of the present invention include, for example, "polyolefin", "polyester", "acrylic resin", "polyvinyl chloride", "nylon", "ethylene-vinyl acetate copolymer", and the like. However, in terms of compatibility with highly water-absorbent resin, adhesion, and inexpensive points,
High density polyethylene, low density polyethylene and ethylene-vinyl acetate copolymer are preferred.
本発明に使用される高吸水性樹脂とは、通常用いられ
ている水不溶性で、自重の20〜1000倍の吸水能力を持つ
ものであり、たとえば、酢酸ビニル−アクリル酸メチル
共重合体のケン化物、イソブチレン−無水マレイン酸共
重合体変成物の架橋物の塩、ポリアクリル酸の架橋物の
塩、およびその変性物、ポリエチレンオキシド変性物、
デンプン−アクリル酸共重合体の塩、スチレン−無水マ
レイン酸共重合体の架橋物の塩などが具体例としてあげ
られるが、これらに限定されるものではなく、これを１
種または２種以上併用してもよい。The superabsorbent resin used in the present invention is a commonly used water-insoluble resin having a water absorption capacity of 20 to 1000 times its own weight, for example, a vinyl acetate-methyl acrylate copolymer Compound, a salt of a crosslinked product of a modified isobutylene-maleic anhydride copolymer, a salt of a crosslinked product of polyacrylic acid, and a modified product thereof, a modified polyethylene oxide product,
Specific examples include a salt of a starch-acrylic acid copolymer and a salt of a crosslinked product of a styrene-maleic anhydride copolymer, but are not limited thereto.
Species or two or more species may be used in combination.
なお、高吸水性樹脂のうち、融点を持たないものは、
あらかじめ機械粉砕等により微粉にして用いるのが好ま
しく、その添加量は使用目的によって異なるが、１〜10
％の範囲が好ましい。In addition, among the superabsorbent resins, those that do not have a melting point,
It is preferable to use a fine powder in advance by mechanical pulverization or the like, and the amount of addition varies depending on the purpose of use.
% Is preferred.
特に、酢酸ビニル−アクリル酸メチル共重合体ケン化
物、または、イソブチレン−無水マレイン酸共重合体変
成物の架橋体の塩が耐候性、耐熱性、耐久性等の点で、
特にすぐれているので好ましい。In particular, a vinyl acetate-methyl acrylate copolymer saponified product, or a salt of a cross-linked product of isobutylene-maleic anhydride copolymer modified product, in terms of weather resistance, heat resistance, durability, etc.
It is particularly preferable because it is excellent.
また、本発明の吸水性皮膜体に用いられる合成樹脂に
高吸水性樹脂を混合する方法は、通常行われているロー
ル、バンバリー混練等公知の方法で容易に製造すること
ができる。In addition, the method of mixing the superabsorbent resin with the synthetic resin used for the water absorbent coating of the present invention can be easily produced by a commonly known method such as roll or Banbury kneading.
つぎに、網目体の製造に用いられる合成樹脂は、前述
した吸水性皮膜体の製造に用いられると同様なものが、
使用できるが、中でも剛性度、耐候性、接着性、安価な
点で、高密度ポリエチレンが最適である。Next, the synthetic resin used in the production of the mesh body is the same as that used in the production of the water-absorbing film described above,
High density polyethylene is most suitable in terms of rigidity, weather resistance, adhesiveness, and low cost.
また、吸水性皮膜体および網目体に使用する合成樹脂
に、通常用いられている適当な安定剤、界面活性剤、紫
外線吸収剤、着色剤、発泡剤等を適宜混合してもよい。The synthetic resin used for the water-absorbing film and the mesh may be appropriately mixed with a suitable stabilizer, surfactant, ultraviolet absorber, coloring agent, foaming agent, and the like, which are usually used.
本発明のワリフを製造する方法は公知の如何なる方法
でもよいが、一例として、スプリットプロセスを説明す
る。The method for producing the wariff of the present invention may be any known method. As an example, a split process will be described.
ポリエチレンを原料とし、高倍率に延伸された広幅の
ポリエチレン製フイルムを割繊し、スプリットウエブ
（割繊維）をつくり、スプリットウエブを所定幅に拡散
しながら高速で連続的に経緯直交積層し熱融着して、網
目状のワリフを製造することができる。Using polyethylene as a raw material, a wide-width polyethylene film stretched at a high magnification is split to produce split webs (split fibers). To form a mesh-like wariff.
なお、本発明のワリフの構成は、少なくとも最外層が
吸水性皮膜体で構成されていることが必須であり、他の
構成は、使用目的によって決るものであり、特に制限さ
れない。Note that the configuration of the wariff of the present invention is essential that at least the outermost layer is formed of a water-absorbing film, and the other configurations are determined by the purpose of use and are not particularly limited.
＜実施例＞ つぎに実施例をあげて本発明を説明するが、これら実
施例は単に例示的なものであって、これらに限定される
ものではない。<Examples> Next, the present invention will be described with reference to examples. However, these examples are merely illustrative, and the present invention is not limited thereto.
なお、実施例中の諸物性値は以下の方法によって測定
したものである。The physical properties in the examples were measured by the following methods.
ア．吸水率 20℃で水道水に24時間浸漬した時の試料の重量（W1）
と同試料を50℃で10時間以上真空乾燥を行った時の絶乾
重量（W0）を測定し、次式より求めた。A. Weight of sample when immersed in tap water at 20 ° C for 24 hours (W 1 )
The absolute dry weight (W 0 ) when the same sample was subjected to vacuum drying at 50 ° C. for 10 hours or more was measured, and was obtained from the following equation.
イ．無滴性 トンネルの展張テストを行い、トンネル内に付着する
水滴の状態を肉眼で観察した。 I. A drip-free tunnel expansion test was performed, and the state of water droplets adhering in the tunnel was visually observed.
ロ．保温性 トンネル内に大根を播種し、20日の大根の草丈から判
定した。すなわち、夜間の保温性がすぐれていると、大
根の生育がよい。B. Heat insulation The radish was sowed in the tunnel, and judged based on the plant height of the radish on the 20th. That is, if the heat retention at night is excellent, the radish grows well.
実施例１ スクリュー径120mmの押出機およびスクリュー径90mm
の押出機を環状スリット径600mmのインフレーション・
ダイスに接続し、前者押出機より高密度ポリエチレン
を、後者押出機より、酢酸ビニル−アクリル酸メチル共
重合体ケン化物を５％含む、エチレン−酢酸ビニル共重
合体を、それぞれ押出し、これら２種のポリマー皮膜を
ダイス内で互いに融着せしめたのち、ダイスより大気中
に押出し、インフレーションすることにより折径約1800
mmの複合フイルムを得た。Example 1 An extruder having a screw diameter of 120 mm and a screw diameter of 90 mm
Extruder with an annular slit diameter of 600 mm
A die was connected, and a high-density polyethylene was extruded from the former extruder, and an ethylene-vinyl acetate copolymer containing 5% of a saponified vinyl acetate-methyl acrylate copolymer was extruded from the latter extruder. Are fused together in a die, extruded from the die into the atmosphere, and blown to a diameter of about 1800.
mm composite film was obtained.
このようにして得た高密度ポリエチレン層厚さ約60
μ、高吸水性樹脂を含むエチレン−酢酸ビニル共重合体
層厚さ約30μ、合計厚さ約90μの複合フィルムを原長の
約９倍に１軸延伸して得られた幅約600mm、厚さ約30μ
の１軸延伸膜を回転丸棒やすりに接触摺動せしめて割繊
し、その連続構造の割繊維網を幅約1800mmに展開した展
開連続割繊維を経割繊維ワリフとし、これを経緯積層
し、約100℃に加熱し圧着して、秤量約21g/m2の割繊維
ワリフを製造した。The high-density polyethylene layer thus obtained has a thickness of about 60
μ, ethylene-vinyl acetate copolymer layer containing superabsorbent resin about 30μ in thickness, about 90mm in total thickness, about 600mm width obtained by uniaxially stretching the composite film to about 9 times the original length, thickness About 30μ
The uniaxially stretched membrane is split into pieces by sliding it into contact with a rotating round bar file. The continuous split fiber obtained by expanding the continuous split fiber network to a width of about 1800 mm is used as a warp split fiber wariff. Then, the mixture was heated to about 100 ° C. and pressure-bonded to produce a split fiber warif having a basis weight of about 21 g / m 2 .
このようにして製造した、ワリフの吸水率、無滴性お
よび保温性を測定した結果を表１に示した。Table 1 shows the results of measuring the water absorption, drip-freeness and heat retention of the wariff thus produced.
実施例２ スクリュー径120mmの押出機２台を、スリット長さ190
0mmのＴダイスに接続し、第１の押出機よりポリプロピ
レンを、第２の押出機よりイソブチレン−無水マレイン
酸共重合体変成物の架橋体の塩を７％含む低密度ポリエ
チレンを、それぞれ押出し、これら２種のポリマー皮膜
をダイス内で互いに融着せしめたのち、ポリプロピレン
皮膜の両面に上記の高吸水性樹脂を含む低密度ポリエチ
レン皮膜が存在する形でダイスより大気中に押出し、直
ちに急冷却することにより、幅約1800mm、ポリプロピレ
ン層厚さ約60μ、各厚さ30μで、２層合わせて、高吸水
性樹脂を含む低密度ポリエチレン層厚さ約60μ、合計厚
さ約120μの複合フィルムを得た。この複合フィルムを
原長の約９倍に１軸延伸して得られた幅約600mm、厚さ
約40μの１軸延伸を回転丸棒やすりに接触摺動せしめて
割繊し、その接続構造の割繊維を経割繊維ワリフとしこ
れを経緯積層し、約110℃に加熱し圧着して、秤量31g/m
2割繊維ワリフを製造した。Example 2 Two extruders having a screw diameter of 120 mm were connected to a slit length of 190 mm.
0 mm T-die and extruded polypropylene from the first extruder and low-density polyethylene containing 7% of a salt of a crosslinked isobutylene-maleic anhydride copolymer from the second extruder, respectively. After these two types of polymer films are fused together in a die, they are extruded from the die into the air in the form of a low-density polyethylene film containing the above-mentioned highly water-absorbent resin on both sides of the polypropylene film, and immediately cooled immediately. By this, a composite film with a width of about 1800 mm, a polypropylene layer thickness of about 60 μ, each thickness of 30 μ, a total of about 120 μ of low-density polyethylene layer containing high water absorbent resin, about 60 μ in total, and a total thickness of about 120 μ Was. This composite film is uniaxially stretched to about 9 times its original length, and its uniaxial stretch of about 600 mm width and thickness of about 40μ is split by sliding it on a rotating round bar file. The split fiber was made into warp fiber wari, which was then laminated by heating and lamination, heated to about 110 ° C and pressed, and weighed 31 g / m.
20 % fiber warifu was manufactured.
このようにして製造した、ワリフの吸水率、無滴性お
そび保温性を測定した結果を表１に示した。Table 1 shows the results of measurement of the water absorption, driplessness and heat retention of the warif thus produced.
比較例１ 実施例１で用いた酢酸ビニル−アクリル酸メチル共重
合体ケン化物を含むエチレン−酢酸ビニル共重合体の代
わりに、エチレン−酢酸ビニル共重合体単独を使用した
ほかは、すべて実施例１と同様にして秤量率21g/m2の割
繊維ワリフを製造した。Comparative Example 1 All of the Examples were performed except that the ethylene-vinyl acetate copolymer alone was used instead of the ethylene-vinyl acetate copolymer containing the saponified vinyl acetate-methyl acrylate copolymer used in Example 1. In the same manner as in Example 1, a split fiber wariff having a weighing ratio of 21 g / m 2 was produced.
このようにして製造した、ワリフの吸水率、無滴性お
よび保温性を測定した結果を表１に示した。Table 1 shows the results of measuring the water absorption, drip-freeness and heat retention of the wariff thus produced.
比較例２ 実施例２で用いたイソブチレン−無水マレイン酸共重
合体変成物の架橋体の塩を含む低密度ポリエチレンの代
わりに、低密度ポリエチレン単独を使用したほかは、す
べて実施例２と同様にして、秤量約31g/m2の割繊維ワリ
フを製造した。Comparative Example 2 In the same manner as in Example 2 except that the low-density polyethylene alone was used instead of the low-density polyethylene containing the salt of the crosslinked isobutylene-maleic anhydride copolymer used in Example 2, Thus, a split fiber warif having a weight of about 31 g / m 2 was produced.
このようにして製造したワリフの吸水率、無滴性およ
び保温性を測定した結果を表１に示した。Table 1 shows the results of measuring the water absorption, drip-freeness, and heat retention of the thus produced wariff.
＜発明の効果＞ 本発明の農業用ワリフは、トンネル、ハウスなど農業
用被覆材として用いた場合、保温性、除湿性および無滴
性に関して、従来から知られている高価なポリビニルア
ルコール合成樹脂皮膜を用いたワリフに比肩しうる程度
にすぐれた性能を示し、かつ安価に製造できるという特
徴を有する。 <Effects of the Invention> When the agricultural warif of the present invention is used as an agricultural covering material such as a tunnel or a house, an expensive polyvinyl alcohol synthetic resin film conventionally known with respect to heat retention, dehumidification and drip-free properties. It has the characteristics that it exhibits excellent performance comparable to that of a wariff using, and can be manufactured at low cost.
また、本発明による他の特徴は、乾燥時、たとえば日
中において、空隙を有し、通気性を有するが、高湿下、
たとえば夜間においては、内外の水分により吸水して自
動的に空隙の大部分を閉止し、保温性、除湿性および無
滴性を兼ね備えている点にある。Another feature of the present invention is that, when dry, for example, in the daytime, it has voids and air permeability, but under high humidity,
For example, in the nighttime, most of the voids are automatically closed by absorbing water from inside and outside water, so that it has both heat retaining property, dehumidifying property and drip-free property.
Claims (2)
吸水性皮膜体層と非吸水性の合成樹脂層とを積層一体化
し、その積層一体化されたものを割繊し、それを経緯積
層して熱融着してなり、該非吸水性の合成樹脂から形成
される網目体がその網状空隙を残して該吸水性皮膜体で
覆われた構造であることを特徴とする網目状の農業用不
織布。1. A water-absorbent film layer made of a synthetic resin containing a super water-absorbent resin and a non-water-absorbent synthetic resin layer are laminated and integrated, and the laminated and integrated material is split. A mesh-like agriculture characterized in that a mesh formed by laminating and heat-sealing and covered with the water-absorbing film is formed with the mesh formed from the non-water-absorbing synthetic resin leaving its mesh-like voids. For nonwoven fabric.
求の範囲第１項記載の農業用不織布。2. The agricultural nonwoven fabric according to claim 1, wherein the mesh body is a high-density polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62116575A JP2645300B2 (en) | 1987-05-13 | 1987-05-13 | Agricultural nonwoven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62116575A JP2645300B2 (en) | 1987-05-13 | 1987-05-13 | Agricultural nonwoven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63283526A JPS63283526A (en) | 1988-11-21 |
| JP2645300B2 true JP2645300B2 (en) | 1997-08-25 |
Family
ID=14690508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62116575A Expired - Lifetime JP2645300B2 (en) | 1987-05-13 | 1987-05-13 | Agricultural nonwoven |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2645300B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2933230B2 (en) * | 1989-12-12 | 1999-08-09 | 花王株式会社 | Fibrous absorber for sanitary goods |
| JPH0452434U (en) * | 1990-09-12 | 1992-05-01 | ||
| JP2810567B2 (en) * | 1991-09-20 | 1998-10-15 | 鐘紡株式会社 | Sheet reinforcement |
| NL1010848C2 (en) * | 1998-12-18 | 2000-06-20 | Stichting Energie | Dehumidifier, especially for greenhouses, comprises roll of film supporting a hygroscopic material |
| KR101778415B1 (en) * | 2012-09-19 | 2017-09-13 | 미쓰이 가가쿠 가부시키가이샤 | Covering material for agricultural use, and method for producing same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5241305A (en) * | 1975-09-29 | 1977-03-30 | Hitachi Ltd | Signalling system for vehicles |
| JPS5534643A (en) * | 1978-09-01 | 1980-03-11 | Toyo Kohan Co Ltd | Manufacture of very thin steel sheet coated with iron- tin alloy |
| JPS5757928B2 (en) * | 1978-05-11 | 1982-12-07 | Hitachi Shipbuilding Eng Co | |
| JPS6183243A (en) * | 1984-09-29 | 1986-04-26 | Okura Ind Co Ltd | Heat insulating film for agriculture |
| JPS6196924A (en) * | 1984-10-16 | 1986-05-15 | 三菱化成ポリテック株式会社 | Synthetic resin film for agriculture |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51100733U (en) * | 1975-02-13 | 1976-08-13 | ||
| JPS5757928U (en) * | 1980-09-22 | 1982-04-05 |
-
1987
- 1987-05-13 JP JP62116575A patent/JP2645300B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5241305A (en) * | 1975-09-29 | 1977-03-30 | Hitachi Ltd | Signalling system for vehicles |
| JPS5757928B2 (en) * | 1978-05-11 | 1982-12-07 | Hitachi Shipbuilding Eng Co | |
| JPS5534643A (en) * | 1978-09-01 | 1980-03-11 | Toyo Kohan Co Ltd | Manufacture of very thin steel sheet coated with iron- tin alloy |
| JPS6183243A (en) * | 1984-09-29 | 1986-04-26 | Okura Ind Co Ltd | Heat insulating film for agriculture |
| JPS6196924A (en) * | 1984-10-16 | 1986-05-15 | 三菱化成ポリテック株式会社 | Synthetic resin film for agriculture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63283526A (en) | 1988-11-21 |
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