JPS6337607B2 - - Google Patents
Info
- Publication number
- JPS6337607B2 JPS6337607B2 JP56162633A JP16263381A JPS6337607B2 JP S6337607 B2 JPS6337607 B2 JP S6337607B2 JP 56162633 A JP56162633 A JP 56162633A JP 16263381 A JP16263381 A JP 16263381A JP S6337607 B2 JPS6337607 B2 JP S6337607B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- irrigation
- synthetic resin
- resin film
- thermoplastic synthetic
- 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
Links
- 230000002262 irrigation Effects 0.000 claims description 30
- 238000003973 irrigation Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 13
- 239000005977 Ethylene Substances 0.000 claims description 13
- 229920003002 synthetic resin Polymers 0.000 claims description 11
- 239000000057 synthetic resin Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 229920001169 thermoplastic Polymers 0.000 claims description 8
- 239000004416 thermosoftening plastic Substances 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000004711 α-olefin Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229920005604 random copolymer Polymers 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 description 13
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- -1 polyethylene Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- HFDVRLIODXPAHB-UHFFFAOYSA-N 1-tetradecene Chemical compound CCCCCCCCCCCCC=C HFDVRLIODXPAHB-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadec-1-ene Chemical compound CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000000895 acaricidal effect Effects 0.000 description 1
- 239000000642 acaricide Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003443 antiviral agent Substances 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004455 differential thermal analysis Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- 238000012685 gas phase polymerization Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Description
【発明の詳細な説明】
本発明は、繰り返し耐圧疲労強度が優れると共
に、耐熱性、耐寒性、耐引裂性、耐衝撃性等の優
れた潅水用屈曲自在な構造物(以下潅水用チユー
ブという)を提供することにある。
近年潅水用チユーブとして、硬質合成樹脂管の
替りに高圧法ポリエチレンやエチレン・酢酸ビニ
ル共重合体を用いた潅水用チユーブが利用されて
いる。これらの潅水用チユーブは、通水時には膨
張して円筒形状を呈し、非通水時には扁平形状を
有するため、従来の硬質合成樹脂管に比べ収納、
運搬、貯蔵が容易であり、さらに栽培植物の株間
形式の変更あるいは潅水区域の任意の形状に自由
に適応設置することができる。
一方、このような形状を有するが故に、従来の
高圧法ポリエチレンやエチレン・酢酸ビニル共重
合体からなる潅水用チユーブは、通水―非通水サ
イクルを繰り返すことにより、該潅水用チユーブ
のヒートシール部に剥離を生じるという問題があ
る。
本発明者らは、かかる問題点につき鋭意研究の
結果、潅水用チユーブの外層に特定の樹脂組成物
を用いることにより、繰り返し耐圧疲労強度の良
好な潅水用チユーブが得られることを見出し、本
発明を完成するに至つた。
すなわち本発明は、長さ方向に沿つて延びた少
なくとも1箇所の連続したヒートシール部を有
し、かつ長さ方向に適切な間隔をおいて配置され
た多数の潅水用孔を有した熱可塑性合成樹脂フイ
ルムからなる潅水用チユーブであつて、
該チユーブは、通水時は膨張して円筒形状を呈
するが、非通水時は扁平となり、
該熱可塑性合成樹脂フイルムは、メルトインデ
ツクス(190℃、2.16Kg)0.5ないし10g/10min、
密度0.900ないし0.940g/cm3、融点110ないし130
℃及びエチレン含有率60ないし97.5重量%の中低
圧法によつて得られるエチレンと炭素数4ないし
20のα―オレフインとのランダム共重合体からな
る熱可塑性合成樹脂のフイルムからなることを特
徴とする潅水用チユーブに関し、また本発明の好
適態様として外層の長さ方向に沿つて延びた少な
くとも1箇所の連続したヒートシール部を有し、
かつ該外層の長さ方向に適当な間隔をおいて配置
された多数の潅水用孔を有した内・外二層からな
る潅水用チユーブにおいて、該外層がメルトイン
デツクス0.5ないし10g/10min、密度0.900ない
し0.940g/cm3、融点110ないし130℃及びエチレ
ン含有率60ないし97.5重量%の中低圧法によつて
得られるエチレンと炭素数4ないし20のα―オレ
フインとのランダム共重合体からなる屈曲自在の
熱可塑性合成樹脂のフイルムからなり、該内層が
該外層の内側に位置し、かつ外層に固定された透
水性で水不溶性のシート状物からなる屈曲自在の
内層であり、該チユーブは、通水時は膨張して円
筒形状を呈するが、非通水時は扁片となることを
特徴とする潅水用チユーブに関する。
本発明において外層に用いられる共重合体でエ
チレンと共重合される炭素数4ないし20のα―オ
レフインとは、1―ブテン、1―ペンテン、1―
ヘキセン、4―メチル―1―ペンテン、1―オク
テン、1―デセン、1―テトラデセン、1―オク
タデセンあるいはこれらの混合物であり、特に炭
素数6ないし8のα―オレフイン、とりわけ4―
メチル―1―ペンテンが好ましい。
また共重合体のメルトインデツクス(ASTM
D1238;190℃、2.16Kg、以下MI)は0.5ないし10
g/10min、好ましくは0.5ないし5g/10minの
範囲にあることが好ましい。MIが0.5未満だと流
動性が劣り成形性が悪く、MIが10を超えると耐
衝撃性や引裂強度等の機械的特性が劣る。共重合
体の密度は、耐衝撃性が良好であるためには、
0.940g/cm3以下であることが好ましく、引張強
さ及び剛性が優れるためには0.900g/cm3以上が
好ましい。また霧度が上記範囲にあるためには、
共重合体中のエチレン含有率は60ないし97.5重量
%である必要がある。さらに共重合体は示差熱分
析(DSC)の昇温速度10℃/minでの吸熱曲線か
ら求めた融点(鋭いピークを示す点)が1個ない
し複数個、多くの場合2個ないし3個、好ましく
は3個ある。そしてその最高融点は、110ないし
130℃、好ましくは115ないし125℃の範囲である。
融点が110℃未満のものはフイルムの耐熱性が劣
り、130℃を越えるものは低温ヒートシール性に
劣る。
前記のような共重合体を製造するには、遷移金
属触媒を用いる所謂中低圧法によつてエチレンと
α―オレフインとを所要密度となるような割合で
重合させることによつて得られる。その際所望の
MIのものを得るには、水素の如き分子量調節剤
を用いればよい。重合はスラリー重合、気相重
合、高温溶解重合などの種々の方法によつて行い
うる。
また上記共重合体には、その特性を損わない範
囲で耐候安定剤、耐熱安定剤、帯電防止剤、防曇
剤、アンチブロツク剤、スリツプ剤、滑剤、顔
料、染料等を添加してもよい。また共重合体の一
部を重量で、10重量%未満の範囲で高圧法ポリエ
チレンに置換えてもよい。
前記共重合体を用いて潅水用チユーブ、すなわ
ち潅水用屈曲自在な構造物を得るには、例えばフ
イルムの長さ方向に多数の潅水用の孔(孔は丸
孔、多角孔あるいはスリツト状等如何なる形状で
もよい)を穿設したテープ状の前記共重合体より
なる連続フイルムと穿設しないテープ状の前記共
重合体よりなる連続フイルムとを積層し、該積層
したテープ状物を走行させながら、その幅方向両
耳部を連続してヒートシールすることにより得ら
れる。また潅水用孔の目詰りを防ぐため、内層と
して透水性で水不溶性のシート状物を用いる場合
は、前記テープ状フイルム積層時に、両テープ状
フイルム間に、透水性で水不溶性の不織布等の連
続したテープ状物が位置するように積層したの
ち、該積層テープ状物の幅方向両耳部をヒートシ
ールすることにより得られる。
このようにして得られる潅水用チユーブは、繰
り返し耐圧疲労強度が(1.2m長のチユーブに、
潅水圧力1.0Kg/cm2で2分間通水したのち2分間
非通水状態とし、前記通水―非通水サイクルを繰
り返し、何回目で該チユーブが破損するかを見る
方法)、従来の高圧法ポリエチレンやエチレン・
酢酸ビニル共重合体からなる潅水用チユーブより
優れ、また耐衝撃性、耐引裂性、耐寒性、耐熱性
にも優れるという特徴をもつ。
本発明の潅水用チユーブすなわち潅水用屈曲自
在の構造物は水だけでなく、液状肥料、水溶性殺
虫、殺ダニ剤、水溶性殺カビ、殺ヴイルス剤、水
溶性除草剤、防塵剤、その他の薬剤を含有する撤
水もしくは潅水を行うことができ、又さらに、比
較的浅い土中での地中潅水も可能な広い適用適性
を有する。
実施例 1
MI2.1g/10min、密度0.920g/cm3、融点120
℃、エチレン含有率91重量%の中低圧法によつて
得られたエチレン・4―メチル―1―ペンテンラ
ンダム共重合体のフイルム(幅42mm)で、フイル
ムの長さ方向に潅水用スリツトを穿設したもの
と、穿設しないものとの間に、熱可塑性合成樹脂
繊維からなる不織布の連続したテープ状物が位置
するように、これらのフイルムを走行させながら
連続的に積層し、該積層フイルムを走行させなが
ら、その幅方向両端縁部を連続的にヒートシール
して潅水用屈曲自在の構造物を得た。この構造物
を用いて繰り返し耐圧疲労強度試験及びJIS
K715の方法に準じる引張クリープ試験を行つた。
結果を第1表に示す。
参考迄に、原反フイルムの引裂強度(JIS
Z1702の方法に準じる)、ヒートシール強度(ヒ
ートシール条件;220℃、2Kg/cm2、2sec)の試
験結果を第1表に併記する。
比較例 1
MI0.5g/10minの高圧法ポリエチレン(ミラ
ソンACE30N、三井ポリケミカル〓)を用い
て実施例1と同様に行つた。結果を第1表に示
す。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention provides a flexible structure for irrigation (hereinafter referred to as irrigation tube) that has excellent repeated pressure fatigue strength, heat resistance, cold resistance, tear resistance, impact resistance, etc. Our goal is to provide the following. In recent years, irrigation tubes made of high-pressure polyethylene or ethylene-vinyl acetate copolymer have been used instead of hard synthetic resin pipes. These irrigation tubes expand into a cylindrical shape when water is flowing through them, and have a flat shape when water is not flowing through them, so they are easier to store and store than conventional hard synthetic resin tubes.
It is easy to transport and store, and can be freely adapted to change the spacing of cultivated plants or to any shape of the irrigation area. On the other hand, because of this shape, conventional irrigation tubes made of high-pressure polyethylene or ethylene/vinyl acetate copolymer are heat-sealed by repeating the water flow/non-water flow cycle. There is a problem that peeling occurs in some parts. As a result of intensive research into this problem, the present inventors discovered that by using a specific resin composition for the outer layer of the irrigation tube, an irrigation tube with good repeated pressure fatigue strength can be obtained, and the present invention has been made. I was able to complete it. That is, the present invention provides a thermoplastic material having at least one continuous heat-sealed portion extending along its length and having a number of irrigation holes arranged at appropriate intervals along its length. An irrigation tube made of a synthetic resin film, which expands and assumes a cylindrical shape when water is flowing through it, but becomes flat when no water is flowing through it, and the thermoplastic synthetic resin film has a melt index (190 ℃, 2.16Kg) 0.5 to 10g/10min,
Density 0.900 to 0.940g/cm 3 , melting point 110 to 130
℃ and ethylene content of 60 to 97.5% by weight by medium and low pressure method and ethylene with carbon number of 4 to 97.5%.
A preferred embodiment of the present invention relates to an irrigation tube characterized in that it is made of a thermoplastic synthetic resin film made of a random copolymer of 20 α-olefins; It has a continuous heat-sealed part,
and an irrigation tube consisting of two layers, an inner and an outer layer, having a large number of irrigation holes arranged at appropriate intervals in the length direction of the outer layer, the outer layer having a melt index of 0.5 to 10 g/10 min, a density of Consisting of a random copolymer of ethylene and α-olefin having 4 to 20 carbon atoms obtained by a medium-low pressure method with a weight of 0.900 to 0.940 g/cm 3 , a melting point of 110 to 130°C, and an ethylene content of 60 to 97.5% by weight. The tube is made of a flexible thermoplastic synthetic resin film, the inner layer is located inside the outer layer, and the flexible inner layer is made of a water-permeable and water-insoluble sheet-like material fixed to the outer layer. , relates to an irrigation tube characterized in that it expands and assumes a cylindrical shape when water is flowing, but becomes a flat piece when water is not flowing. In the present invention, α-olefins having 4 to 20 carbon atoms copolymerized with ethylene in the copolymer used in the outer layer include 1-butene, 1-pentene, 1-
hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-tetradecene, 1-octadecene or mixtures thereof, especially α-olefins having 6 to 8 carbon atoms, especially 4-
Methyl-1-pentene is preferred. Also, the copolymer melt index (ASTM
D1238; 190℃, 2.16Kg, hereinafter MI) is 0.5 to 10
g/10 min, preferably in the range of 0.5 to 5 g/10 min. If the MI is less than 0.5, the fluidity will be poor and the moldability will be poor, and if the MI is more than 10, the mechanical properties such as impact resistance and tear strength will be poor. The density of the copolymer must be determined in order to have good impact resistance.
It is preferably 0.940 g/cm 3 or less, and preferably 0.900 g/cm 3 or more for excellent tensile strength and rigidity. In addition, in order for the fog level to be within the above range,
The ethylene content in the copolymer should be between 60 and 97.5% by weight. Furthermore, the copolymer has one or more melting points (points showing sharp peaks), often two or three, as determined from the endothermic curve of differential thermal analysis (DSC) at a heating rate of 10°C/min. Preferably there are three. And its highest melting point is 110 or
130°C, preferably in the range of 115 to 125°C.
If the melting point is less than 110°C, the film will have poor heat resistance, and if it exceeds 130°C, the low-temperature heat sealability will be poor. The above-mentioned copolymer can be produced by polymerizing ethylene and α-olefin in a proportion that provides the required density by a so-called medium-low pressure method using a transition metal catalyst. At that time, the desired
To obtain MI, a molecular weight modifier such as hydrogen may be used. Polymerization can be carried out by various methods such as slurry polymerization, gas phase polymerization, and high temperature solution polymerization. In addition, weathering stabilizers, heat-resistant stabilizers, antistatic agents, antifogging agents, anti-blocking agents, slip agents, lubricants, pigments, dyes, etc. may be added to the above copolymer to the extent that its properties are not impaired. good. Further, a portion of the copolymer may be replaced with high-pressure polyethylene in an amount of less than 10% by weight. In order to obtain an irrigation tube, that is, a flexible structure for irrigation, using the copolymer, for example, a large number of irrigation holes (the holes may be round, polygonal, slit, etc.) in the longitudinal direction of the film are used. A continuous film made of the copolymer in the form of a tape with perforations (which may be of any shape) and a continuous film made of the copolymer in the form of a tape with no perforations are laminated, and while running the laminated tape-like material, It is obtained by successively heat-sealing both widthwise ear portions. In addition, in order to prevent clogging of the irrigation holes, if a water-permeable, water-insoluble sheet-like material is used as the inner layer, a water-permeable, water-insoluble nonwoven fabric, etc. It is obtained by laminating the tape-like articles in such a way that continuous tape-like articles are positioned, and then heat-sealing both edges in the width direction of the laminated tape-like articles. The irrigation tube obtained in this way has a repeated pressure fatigue strength (for a 1.2 m long tube,
A method of passing water for 2 minutes at an irrigation pressure of 1.0 Kg/cm 2 and then not allowing water to pass for 2 minutes, repeating the water passing/not passing cycle and seeing how many times the tube breaks), conventional high pressure Legal polyethylene and ethylene
It is superior to irrigation tubes made of vinyl acetate copolymer, and also has excellent impact resistance, tear resistance, cold resistance, and heat resistance. The irrigation tube of the present invention, that is, the flexible structure for irrigation, can be used not only for water but also for liquid fertilizers, water-soluble insecticides, acaricides, water-soluble fungicides, virucidal agents, water-soluble herbicides, dustproofing agents, and other substances. It has a wide range of applicability, allowing for drainage or irrigation of water containing chemicals, and also for underground irrigation in relatively shallow soil. Example 1 MI2.1g/10min, density 0.920g/cm 3 , melting point 120
A film (width 42 mm) of ethylene/4-methyl-1-pentene random copolymer obtained by a medium-low pressure method with an ethylene content of 91% by weight at These films are laminated continuously while running so that a continuous tape-like material of non-woven fabric made of thermoplastic synthetic resin fibers is located between the film with holes and the film with no holes. While running, both edges in the width direction were continuously heat-sealed to obtain a flexible structure for irrigation. Using this structure, repeated pressure fatigue strength tests and JIS
A tensile creep test was conducted according to the method of K715.
The results are shown in Table 1. For reference, the tear strength of the original film (JIS
Table 1 also shows the test results of heat sealing strength (according to the method of Z1702) and heat sealing strength (heat sealing conditions: 220°C, 2Kg/cm 2 , 2sec). Comparative Example 1 The same procedure as in Example 1 was carried out using high-pressure polyethylene (Mirason ACE30N, Mitsui Polychemical Co., Ltd.) with an MI of 0.5 g/10 min. The results are shown in Table 1. 【table】
Claims (1)
連続したヒートシール部を有し、かつ長さ方向に
適切な間隔をおいて配置された多数の潅水用孔を
有した熱可塑性合成樹脂フイルムからなる潅水用
チユーブであつて、 該チユーブは、通水時は膨張して円筒形状を呈
するが、非通水時は扁平となり、 該熱可塑性合成樹脂フイルムは、メルトインデ
ツクス(190℃、2.16Kg)0.5ないし10g/10min、
密度0.900ないし0.940g/cm3、融点110ないし130
℃及びエチレン含有率60ないし97.5重量%の中低
圧法によつて得られるエチレンと炭素数4ないし
20のα―オレフインとのランダム共重合体からな
る熱可塑性合成樹脂のフイルムからなることを特
徴とする潅水用チユーブ。 2 前記熱可塑性合成樹脂フイルムからなる層の
内側に位置し、透水性で水不溶性のシート状物か
らなる内層を有する特許請求の範囲第1項に記載
の潅水用チユーブ。[Claims] 1. It has at least one continuous heat-sealed portion extending along its length, and has a large number of irrigation holes arranged at appropriate intervals in its length. An irrigation tube made of a thermoplastic synthetic resin film, which expands and assumes a cylindrical shape when water is flowing through it, but becomes flat when no water is flowing through it, and the thermoplastic synthetic resin film has a melt index. (190℃, 2.16Kg) 0.5 to 10g/10min,
Density 0.900 to 0.940g/cm 3 , melting point 110 to 130
℃ and ethylene content of 60 to 97.5% by weight by medium and low pressure method and ethylene with carbon number of 4 to 97.5%.
An irrigation tube characterized by being made of a thermoplastic synthetic resin film made of a random copolymer with 20 α-olefins. 2. The irrigation tube according to claim 1, which has an inner layer made of a water-permeable, water-insoluble sheet-like material located inside the layer made of the thermoplastic synthetic resin film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56162633A JPS5863334A (en) | 1981-10-14 | 1981-10-14 | Freely bendable structure for irrigation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56162633A JPS5863334A (en) | 1981-10-14 | 1981-10-14 | Freely bendable structure for irrigation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5863334A JPS5863334A (en) | 1983-04-15 |
JPS6337607B2 true JPS6337607B2 (en) | 1988-07-26 |
Family
ID=15758315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56162633A Granted JPS5863334A (en) | 1981-10-14 | 1981-10-14 | Freely bendable structure for irrigation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5863334A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001169672A (en) * | 1999-12-17 | 2001-06-26 | Mikado Ikushu Nojo:Kk | System for culturing plant in hydroponic culture medium |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61206888A (en) * | 1985-03-08 | 1986-09-13 | 豊田合成株式会社 | High-pressure rubber hose |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4935345A (en) * | 1972-07-31 | 1974-04-01 | ||
JPS5392887A (en) * | 1977-01-27 | 1978-08-15 | Mitsui Petrochem Ind Ltd | Ethylene copolymer |
JPS55141134A (en) * | 1979-04-21 | 1980-11-04 | Mitsui Petrochemical Ind | Soil surface irrigation |
JPS5664729A (en) * | 1980-07-22 | 1981-06-02 | Mitsui Petrochemical Ind | Multilayered water supply pipe |
-
1981
- 1981-10-14 JP JP56162633A patent/JPS5863334A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4935345A (en) * | 1972-07-31 | 1974-04-01 | ||
JPS5392887A (en) * | 1977-01-27 | 1978-08-15 | Mitsui Petrochem Ind Ltd | Ethylene copolymer |
JPS55141134A (en) * | 1979-04-21 | 1980-11-04 | Mitsui Petrochemical Ind | Soil surface irrigation |
JPS5664729A (en) * | 1980-07-22 | 1981-06-02 | Mitsui Petrochemical Ind | Multilayered water supply pipe |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001169672A (en) * | 1999-12-17 | 2001-06-26 | Mikado Ikushu Nojo:Kk | System for culturing plant in hydroponic culture medium |
Also Published As
Publication number | Publication date |
---|---|
JPS5863334A (en) | 1983-04-15 |
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