JPS63275769A - Extruded stretched net - Google Patents
Extruded stretched netInfo
- Publication number
- JPS63275769A JPS63275769A JP62108148A JP10814887A JPS63275769A JP S63275769 A JPS63275769 A JP S63275769A JP 62108148 A JP62108148 A JP 62108148A JP 10814887 A JP10814887 A JP 10814887A JP S63275769 A JPS63275769 A JP S63275769A
- Authority
- JP
- Japan
- Prior art keywords
- net
- weight
- density polyethylene
- linear low
- stretching
- 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.)
- Granted
Links
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 25
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 17
- 229920001577 copolymer Polymers 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 11
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 4
- WCVOGSZTONGSQY-UHFFFAOYSA-N 2,4,6-trichloroanisole Chemical compound COC1=C(Cl)C=C(Cl)C=C1Cl WCVOGSZTONGSQY-UHFFFAOYSA-N 0.000 claims 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 13
- 239000005977 Ethylene Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- 238000000465 moulding Methods 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004711 α-olefin Substances 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- 241001672694 Citrus reticulata Species 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 241000220225 Malus Species 0.000 description 2
- 241000220324 Pyrus Species 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000021016 apples Nutrition 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000021017 pears Nutrition 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 239000004233 Indanthrene blue RS Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- IFKWVQNWZSUEIA-UHFFFAOYSA-N but-1-ene;hex-1-ene Chemical compound CCC=C.CCCCC=C IFKWVQNWZSUEIA-UHFFFAOYSA-N 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 230000000968 intestinal effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007613 slurry method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、包装用として用いることのできる、強度、戻
り性、外観に優れた押出延伸ネットに関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extruded stretched net that can be used for packaging and has excellent strength, returnability, and appearance.
従来、ミカン、リンゴ、ナシ等の果実包装材としては通
気性の改良、荷くずれ防止、低価格の必要性から、戻り
性の優れた押出延伸ネットが広く用いられてきた。該包
装用の押出延伸ネットにおいては戻り性はもとより、包
装物の重量に耐える強度及びネット目の交点が充分に融
着されたきれいな外観を有していることが要求される。Conventionally, extruded and stretched nets with excellent return properties have been widely used as packaging materials for fruits such as mandarin oranges, apples, and pears due to the need for improved air permeability, prevention of load collapse, and low cost. The extruded stretched net for packaging is required not only to have return properties but also to have strength to withstand the weight of the package and a clean appearance with the intersections of the net mesh sufficiently fused.
このような押出延伸ネットの材料としては、従来一般的
にエチレン赤酢酸ビニル共重合体、分岐状低密度ポリエ
チレン及びこれらと線状低密度ポリエチレンのブレンド
物が用いられてきた。As materials for such extruded stretched nets, ethylene red vinyl acetate copolymers, branched low-density polyethylenes, and blends of these and linear low-density polyethylenes have conventionally been used.
しかしながら、このような従来の押出延伸ネットの材料
として用いられているエチレン昏酢酸ビニル共重合体や
分岐状低密度ポリエチレンを押出機で製網し、延伸して
得られる押出延伸ネットは、強度及び戻り性が不充分で
あるため、製品の樹脂量すなわち単位長さ当りの目付は
量を増して改良しているが、製品の樹脂量が増加する分
だけコストが高くなってしまう、一方、従来のエチレン
・酢酸ビニル共重合体もしくは分岐状低密度ポリエチレ
ンと線状低密度ポリエチレンとをブレンドした場合、線
状低密度ポリエチレンのブレンド比の増加と共に強度は
改良されるが戻り性が悪くなる。However, the extruded stretched net obtained by making a net using an extruder and stretching the ethylene copolymerized vinyl acetate copolymer or branched low-density polyethylene used as the material for such conventional extruded stretched net has poor strength and strength. Due to the insufficient returnability, the amount of resin in the product, that is, the basis weight per unit length, has been improved by increasing the amount of resin, but the cost increases due to the increase in the amount of resin in the product. When blending the ethylene/vinyl acetate copolymer or branched low density polyethylene with linear low density polyethylene, as the blend ratio of linear low density polyethylene increases, the strength improves, but the return properties deteriorate.
また、これらネットの強度及び戻り性を更に改良するた
めに延伸倍率を高くしようとすると、ネットが延伸切れ
を起したり、ネット目の交点が充分に融着されず外観が
不良となる等の問題点がある。In addition, when trying to increase the stretching ratio to further improve the strength and return properties of these nets, the net may break during stretching or the intersections of the mesh may not be sufficiently fused, resulting in poor appearance. There is a problem.
本発明者らは、前述の問題点を解決すべく単位長さ当り
の目付は量見合いで強度、戻り性の優れた押出延伸ネッ
トについて鋭意検討した結果、特定のポリオレフィン組
成物を特定の倍率で延伸することにより、従来にない優
れた強度と優れた戻り性を有する押出延伸ネットを見い
出し、本発明に至ったものである。In order to solve the above-mentioned problems, the present inventors have conducted intensive studies on extruded and stretched nets that have excellent strength and return properties in proportion to the weight per unit length. By stretching, we discovered an extruded stretched net that has unprecedented strength and excellent return properties, leading to the present invention.
すなわち本発明は、メルトフロレートが０．０５〜１０
ｇ／１０分、酢酸ビニル含量が１〜５０重量２であるエ
チレン・酢酸ビニル共重合体（Ａ）２０〜９０重量駕に
、メルトフローレートが０．０５〜５ｇ／１０分、密度
がＯ，ＩＪ３０ｇ／ ｃＩｌ’以下で、かつ、ダイスウ
ェル比が１．４以上である線状低密度ポリエチレン（Ｂ
） ７５〜５重量ｔと、メルトフローレートが０．０５
〜５８／１０分、密度が０．９３０ｇ／ ａｍ１以下で
、かつ、ダイスウェル比が１．３以下である線状低密度
ポリエチレン（Ｃ） ７５〜５重量ｔとを配合した組成
物を製網し、 ３倍以上の倍率で延伸してなることを特
徴とする押出延伸ネットである。That is, in the present invention, the melt fluorate is 0.05 to 10
g/10 min, a melt flow rate of 0.05 to 5 g/10 min, a density of O, Linear low density polyethylene (B
) 75 to 5 weight tons and melt flow rate of 0.05
~58/10 minutes, a composition blended with 75~5 weight t of linear low density polyethylene (C) having a density of 0.930 g/am1 or less and a die swell ratio of 1.3 or less was made into a net. This is an extruded stretched net characterized by being stretched at a magnification of 3 times or more.
１處崖】
（Ａ）エチレン番酢酸ビニル共重合体成分本発明におい
て用いられるエチレン・酢酸ビニル共重合体トシテハ、
圧力５００〜５０００ｋｇ／ｃｍｚ、温度１００〜３５
０℃下で酸素、有機過酸化物等のラジカル発生剤を用い
、エチレンと酢酸ビニルを共重合させて得られる通常の
高圧法エチレン争酢酸ビニル共重合体が用いられる。該
共重合体はメルトフローレートが０．０５〜１０ｇ／１
０分、好ましくは０．１〜５ｇ／ ｌＣ１分、特に好ま
しくは０．１〜３ ｇ／１０分で、酢酸ビニル含量が１
〜５０重量２、好ましくは２〜３０重量ｔ、特に好まし
くは２〜１５重量工のものである。(A) Ethylene/vinyl acetate copolymer component Ethylene/vinyl acetate copolymer used in the present invention,
Pressure 500-5000kg/cmz, temperature 100-35
A conventional high-pressure ethylene/vinyl acetate copolymer obtained by copolymerizing ethylene and vinyl acetate at 0° C. using a radical generator such as oxygen or an organic peroxide is used. The copolymer has a melt flow rate of 0.05 to 10 g/1
0 min, preferably 0.1-5 g/lC1 min, particularly preferably 0.1-3 g/10 min, when the vinyl acetate content is 1
~50wt2, preferably 2-30wt, particularly preferably 2-15wt.
該共重合体の上記組成物に対する配合割合としては、重
量で２０−９０％、好ましくは３０〜９０駕である。The proportion of the copolymer in the above composition is 20-90% by weight, preferably 30-90% by weight.
エチレン・酢酸ビニル共重合体のメルトフローレートが
上記範囲を超えると強度を向上させることができない、
また、上記範囲未満では成形時のモーター負荷が高くな
る、樹脂圧力が高くなる等の問題がある。If the melt flow rate of the ethylene/vinyl acetate copolymer exceeds the above range, the strength cannot be improved.
Furthermore, if it is less than the above range, there are problems such as an increase in motor load during molding and an increase in resin pressure.
酢酸ビニル含量が上記範囲を超えるものは原料の製造コ
ストが高い、また上記範囲未満のものでは剛性が高く、
戻り性も悪くなる。If the vinyl acetate content exceeds the above range, the manufacturing cost of the raw material is high, and if it is below the above range, the rigidity is high.
The return property also deteriorates.
上記組成物に対する重量比が上記範囲を超えると強度を
向上させることができず、高延伸倍率におけるネットの
延伸切れを起こし安定的に製品が得られない、また、上
記範囲未満では戻り性が悪くなり、所望の延伸倍率でネ
ット目の交点が充分に融着されず、外観が不良となる。If the weight ratio to the above-mentioned composition exceeds the above range, the strength cannot be improved, and the net will break at high stretching ratios, making it impossible to obtain a stable product.If the weight ratio is below the above range, the return property will be poor. Therefore, the intersection points of the net meshes are not sufficiently fused at the desired stretching ratio, resulting in poor appearance.
（Ｂ）線状低密度ポリエチレン成分
本発明で配合される線状低密度ポリエチレン（Ｂ）とは
、圧力５〜２５０Ｑｋｇ／ ｃ＋ｓｚ、温度５０〜３０
０℃下でフィリップス型触媒、バナジウム型触媒、チー
グラー型触媒等を使用して得られるエチレン・α−オレ
フィン共重合体である。共重合させるコモノマーである
α−オレフィンとしては、プロピレン、フテンー１．
ヘンテン−１、ヘキセン−１，４−メチルペンテン−１
、オクテン−１等の炭素数３〜２０程度のα−オレフィ
ンが挙げられる。好ましいα−オレフィンとしてはブテ
ン−１、ヘキセン−！、４−メチルペンテン−１、オク
テン−１である。(B) Linear low-density polyethylene component The linear low-density polyethylene (B) blended in the present invention has a pressure of 5 to 250 Qkg/c+sz and a temperature of 50 to 30
It is an ethylene/α-olefin copolymer obtained using a Phillips type catalyst, a vanadium type catalyst, a Ziegler type catalyst, etc. at 0°C. As the α-olefin which is a comonomer to be copolymerized, propylene, phthene-1.
Henten-1, hexene-1,4-methylpentene-1
, octene-1, and other α-olefins having about 3 to 20 carbon atoms. Preferred α-olefins include butene-1 and hexene-! , 4-methylpentene-1, and octene-1.
これらエチレンとα−オレフィン（通常の含量は３〜！
５重量２）との共重合は気相法、溶液法、スラリー法、
高圧法等により行なうことができる。These ethylene and α-olefin (normal content is 3~!
Copolymerization with 5 weight 2) can be carried out by gas phase method, solution method, slurry method,
This can be done by a high pressure method or the like.
このようにして製造された線状低密度ポリエチレンで、
メルトフローレートが０．０５〜５ｇ／１０分、好まし
くは０．１〜３ｇ／１０分、特に好ましくは０．２〜２
ｇ／１０分、密度が０．９３０ ｇｒａｍ”以下、好
ましくは０．９２５ ｇｒａｍ”以下、かつ、ダイスウ
ェル比１．４以上、好ましくは１．４５以上のものが線
状低密度ポリエチレンＣＢ）として使用される。The linear low-density polyethylene produced in this way,
Melt flow rate is 0.05 to 5 g/10 min, preferably 0.1 to 3 g/10 min, particularly preferably 0.2 to 2
g/10 min, density is 0.930 gram" or less, preferably 0.925 gram" or less, and the die swell ratio is 1.4 or more, preferably 1.45 or more as linear low-density polyethylene CB). used.
該線状低密度ポリエチレン（Ｂ）は上記組成物に対して
７５〜５重Ｉ駕、好ましくは９０〜ｌＯ重量２の割合で
使用される。The linear low-density polyethylene (B) is used in an amount of 75 to 5 parts per weight, preferably 90 to 10 parts per weight, based on the above composition.
線状低密度ポリエチレン（Ｂ）のメルトフローレートが
上記範囲を超えると強度を向上させることができず、所
望の延伸倍率でネット目の交点が充分に融着されず外観
が不良となり、また上記範囲未満では成形時のモーター
負荷が高くなる、樹脂圧力が高くなる等の問題がある。If the melt flow rate of the linear low-density polyethylene (B) exceeds the above range, the strength cannot be improved, and the intersections of the nets will not be sufficiently fused at the desired stretching ratio, resulting in poor appearance. If it is less than this range, there will be problems such as increased motor load during molding and increased resin pressure.
密度が上記範囲を超えるものは剛性が高すぎ、戻り性も
悪くなる。ダイスウェル比が上記範囲未満のものは所望
の延伸倍率ではネット目の交点が充分に融着されず外観
が不良となり、戻り性も悪くなる。If the density exceeds the above range, the rigidity will be too high and the return property will be poor. If the die swell ratio is less than the above range, the intersection points of the mesh will not be sufficiently fused at the desired stretching ratio, resulting in poor appearance and poor return properties.
上記組成物に対する重量比が上記範囲を超える量の配合
では戻り性が悪く、所望の延伸倍率でネット目の交点が
充分に融着されず外観が不良となる。また、上記範囲未
満では強度を向上させることができず、高延伸率ではネ
ットの延伸切れを起こし、安定的に製品が得られない。If the weight ratio to the above composition exceeds the above range, the return property will be poor, and the intersection points of the mesh will not be sufficiently fused at the desired stretching ratio, resulting in poor appearance. Further, if the stretching ratio is less than the above range, the strength cannot be improved, and if the stretching ratio is high, the net will break in stretching, making it impossible to stably obtain a product.
（Ｃ）線状低密度ポリエチレン成分（Ｃ）本発明におい
ては、前記線状低密度ポリエチレン成分（Ｂ）とは性質
の異なる線状低密度ポリエチレン成分（Ｃ）を用いるこ
とが重要である。(C) Linear low-density polyethylene component (C) In the present invention, it is important to use a linear low-density polyethylene component (C) that has different properties from the linear low-density polyethylene component (B).
ここで用いられる線状低密度ポリエチレン成分（Ｃ）は
、メルトフローレートが０．０５〜５ ｇ／１０分、好
ましくは０．１〜３ ｇ／１０分、密度０．Ｅ１３０
ｇ／ｃ履Ｓ以下、好ましくは０．１３２５１／ａｍ”以
下、ダイスウェル比１．３以下のものであり、この線状
低密度ポリエチレン成分（Ｃ）は前記線状低密度ポリエ
チレン成分（Ｂ）と同様の方法で製造したものを用いる
ことができる。The linear low density polyethylene component (C) used here has a melt flow rate of 0.05 to 5 g/10 min, preferably 0.1 to 3 g/10 min, and a density of 0. E130
g/c foot S or less, preferably 0.13251/am” or less, and a die swell ratio of 1.3 or less, and this linear low density polyethylene component (C) is the same as the linear low density polyethylene component (B). It is possible to use a product manufactured by the same method as .
本発明に゛おける線状低密゛度ポリエチレン成分（Ｃ）
の使用量は前記組成物に対して７５〜５重量２、好まし
くは９０〜１０重量２の割合で使用される。Linear low density polyethylene component (C) in the present invention
The amount used is 75 to 5% by weight, preferably 90 to 10% by weight of the composition.
線状低密度ポリエチレン（Ｃ）のメルトフローレートが
上記範囲を超えるものでは強度を向上させることができ
ず、所望の延伸倍率でネット目の交点が充分に融着され
ず外観が不良となり、また、上記範囲未満では成形時の
モーター負荷が高くなる、樹脂圧力が高くなる等の問題
がある。If the melt flow rate of the linear low-density polyethylene (C) exceeds the above range, the strength cannot be improved, and the intersection points of the mesh will not be sufficiently fused at the desired stretching ratio, resulting in poor appearance. If it is less than the above range, there are problems such as increased motor load during molding and increased resin pressure.
密度が上記範囲を超えるものは剛性が高くなり、戻り性
も悪くなる。ダイスウェル比が１．３を超えるものは強
度の改良効果が小さい。If the density exceeds the above range, the rigidity will be high and the return property will be poor. When the die swell ratio exceeds 1.3, the strength improvement effect is small.
全組成物に対する重量比が上記範囲を超えるものでは戻
り性が悪く、所望の延伸倍率ではネット目の交点が充分
に融着されず外観が不良となり、また、上記範囲未満の
配合では大幅に強度を向上させることができず、高延伸
率ではネットの延伸切れを起こし安定的に製品が得られ
ない。If the weight ratio to the total composition exceeds the above range, the return property will be poor, and at the desired stretching ratio, the intersections of the net mesh will not be sufficiently fused, resulting in poor appearance.If the weight ratio is less than the above range, the strength will be significantly reduced. At high stretching rates, the net may break and a stable product cannot be obtained.
本発明におけるメルトフローレートの測定は。Measurement of melt flow rate in the present invention.
ＪＩＳ Ｋ７２１０ （熱可塑性プラスチックの流れ試
験方法）により試験温度１９０℃、試験荷重２．１８ｋ
ｇで測定した値である。また、エチレン・酢酸ビニル共
重合体中の酢酸ビニル含量は、 ＪＩＳ Ｋ８７３０
（エチレン争酢酸ビニル樹脂試験方法）により測定し
た値である。更に、密度はＪＩＳ Ｋ８７９０ （ポ
リエチレン試験方法）により測定した値である。そして
。Test temperature: 190℃, test load: 2.18k according to JIS K7210 (thermoplastic plastic flow test method)
This is the value measured in g. In addition, the vinyl acetate content in the ethylene/vinyl acetate copolymer is determined by JIS K8730.
(Test method for ethylene-vinyl acetate resin). Furthermore, the density is a value measured according to JIS K8790 (polyethylene test method). and.
ダイスウェル比はＪＩＳ Ｋ７２１Ｇ （熱可塑性プラ
スチックの流れ試験方法）でシリンダーに長さ８−１直
径 １■のストレートノズルを入れ。The die swell ratio is JIS K721G (flow test method for thermoplastic plastics), and a straight nozzle with a length of 8-1 and a diameter of 1 inch is inserted into the cylinder.
１９０℃、ピストン速度２腸脂／分 （せん断速度２４
ｓｅｃ−’）で押し出したストランドを、エチルアルコ
ール等の液体中で押し出した直後に固化させ、そのスト
ランドの直径を測定した値である。190℃, piston speed 2 intestinal fat/min (shear rate 24
sec-') is solidified immediately after extrusion in a liquid such as ethyl alcohol, and the diameter of the strand is measured.
Ｌ裏１立１１
本発明で前述のエチレン・酢酸ビニル共重合体（Ａ）と
線状低密度ポリエチレン成分（Ｂ）及び線状低密度ポリ
エチレン成分（Ｃ）をブレンドする方法としてはロール
、バンバリー、ニーダ−１押出機等の混線機で溶融混練
する方法、またヘンシェル型ミキサー、■ブレンダー、
タンブラ−等のドライブレンダ−でトライブレンドする
等の公知の方法を適用することができる。In the present invention, the above-mentioned ethylene/vinyl acetate copolymer (A), linear low-density polyethylene component (B), and linear low-density polyethylene component (C) can be blended by rolling, Banbury, A method of melt-kneading with a mixer such as a kneader-1 extruder, a Henschel type mixer, ■ a blender,
Known methods such as tri-blending with a dry blender such as a tumbler can be applied.
このようなポリオレフィン組成物に、更に酸化防止剤、
中和剤、滑剤、アンチブロッキング剤、帯電防止剤、紫
外線吸収剤等の添加剤、またカーボンブラック、有機系
顔料、無機系顔料等の着色剤及びこれら添加剤、着色剤
等をマスターバッチとして添加するための少量（３０重
量２以下）の樹脂を必要に応じて配合することもできる
。若しくは、他の樹脂やゴムを本発明の効果を損なわな
い範囲で含有させることもできる。Such a polyolefin composition may further contain an antioxidant,
Additives such as neutralizing agents, lubricants, anti-blocking agents, antistatic agents, and ultraviolet absorbers, as well as colorants such as carbon black, organic pigments, and inorganic pigments, and these additives and colorants are added as masterbatches. If necessary, a small amount (30% by weight or less) of resin may be blended to achieve this. Alternatively, other resins and rubbers may be included within the range that does not impair the effects of the present invention.
前記組成物を用いて本発明の押出延伸ネットを製造する
方法としては１回転グイ構造を有するプラスチックネッ
ト用押出成形装置にて回転グイにある複数のノズルから
、溶融したポリオレフィン組成物を押し出しネット状に
溶融成形して冷却させ、その後所定の温度に加熱し延伸
ロールの速度差によって延伸させることにより製造でき
る。この時の延伸倍率は３倍以上、好ましくは４倍以上
、更に好ましくは５倍以上である。延伸倍率が上記範囲
未満では強度及び戻り性の改良効果が小さい。The method for producing the extruded stretched net of the present invention using the composition is to extrude the molten polyolefin composition into a net shape through a plurality of nozzles on the rotating gouer in an extrusion molding device for plastic nets having a single-rotation gouer structure. It can be produced by melt-molding, cooling, heating to a predetermined temperature, and stretching using a speed difference between stretching rolls. The stretching ratio at this time is 3 times or more, preferably 4 times or more, and more preferably 5 times or more. If the stretching ratio is less than the above range, the effect of improving strength and returnability is small.
具体的には、車軸スクリューの押出機により１５０〜２
５０℃に溶融された樹脂組成物をグイ内で融着させるダ
イ内融着ダイス、グイ外で融着させるダイ外融着ダイス
等を用いダイスを回転させることによりネット状に押し
出し、最終ネット製品の折り径を制御するための円筒状
支持体を有する。温度θ〜４０℃の冷却水槽中にネット
を押し出して冷却し、温度４０〜９０℃の乾式法、湿式
法等の延伸装置で一段または多段の工程で延伸倍率（引
き取り速度に対する送り速度の比）が所望倍率になるよ
う延伸する。延伸処理で得られたネットを安定化させる
ため、通常４０〜９０℃の温度で熱処理しておくことが
望ましい。Specifically, 150 to 2
The resin composition melted at 50°C is extruded into a net shape by rotating the die using an in-die fusion die that fuses the resin composition inside the goo, an outside-die fusion die that fuses it outside the goo, etc., and produces the final net product. It has a cylindrical support for controlling the folding diameter. The net is extruded into a cooling water tank at a temperature of θ to 40°C, cooled, and then stretched in one or multiple steps using a dry method, wet method, or other stretching device at a temperature of 40 to 90°C to obtain a stretching ratio (ratio of feed speed to take-up speed). Stretch it to the desired magnification. In order to stabilize the net obtained by the stretching process, it is usually desirable to heat-treat the net at a temperature of 40 to 90°C.
以下に本発明の実施例を挙げて更に具体的に説明する。 EXAMPLES The present invention will be described in more detail below with reference to Examples.
実施例１
（イ）押出延伸ネットの製造
メルトフローレートが０．５ｇ／１０分、酢酸ビニル含
量５重Ｉ２のエチレン・酢酸ビニル共重合体（Ａ） ５
０重量ｘに、メルト７ ａ −レー）が０．７ｇ／１０
分、密度０．９２２１／ｃｍ” 、ダイスウェル比が１
．５２のブテン−１含量７．５重量２の線状低密度ポリ
エチレン（Ｂ） ２５重量２と、メルトフローレートが
１．０ｇ／１０分、密度０Ｊ２０ ｇ／ｃ＋ｓ’ 、ダ
イスウェル比が１．２０のブテン−！含量８．０重量２
の線状低密度ポリエチレン（Ｃ） ２５重量２をトライ
ブレンドした後、ダイ内融着ダイを有する４０■■径の
押出機で、グイを回転させながら温度２００℃で両方の
グイノズル９０本（片方４０本）よりフィラメントを押
し出し、ネット状に融着成形し、θ０■層径の円筒状支
持体を有する温度１５℃の冷却水槽に通して固化させる
。その後このネットを温度７０℃の延伸水槽に通して前
後のロール速度を調整して延伸倍率５倍のネットを製造
した。なお、目付は量は長さ！１当り８．０〜８．２ｇ
となるよう押出量で調整した。Example 1 (a) Production of extruded stretched net Ethylene-vinyl acetate copolymer (A) with a melt flow rate of 0.5 g/10 minutes and a vinyl acetate content of 5-fold I2 5
0 weight x, melt 7 a-ray) is 0.7g/10
min, density 0.9221/cm”, die swell ratio 1
．． 52 butene-1 content 7.5 weight 2 linear low density polyethylene (B) 25 weight 2, melt flow rate 1.0 g/10 min, density 0J20 g/c+s', die swell ratio 1.20 Butene-! Content 8.0 weight 2
After tri-blending 25 weight 2 of linear low-density polyethylene (C), 90 Goo nozzles (one The filaments were extruded from 40 filaments, fusion-molded into a net shape, and solidified by passing through a cooling water bath at a temperature of 15°C having a cylindrical support having a layer diameter of θ0■. Thereafter, this net was passed through a stretching water bath at a temperature of 70° C., and the front and rear roll speeds were adjusted to produce a net with a stretching ratio of 5 times. In addition, the amount per unit area is the length! 8.0-8.2g per serving
The extrusion amount was adjusted so that
（ロ）押出延伸ネットの性能評価
前記（イ）で得られた押出延伸ネットについての性能の
評価を次の通り実施し、その結果を第１表に−示す。(b) Performance evaluation of extruded stretched net The performance of the extruded stretched net obtained in (a) above was evaluated as follows, and the results are shown in Table 1.
（ａ）強度
ネットのフィラメント １木奢測定最大可能荷重１ｋｇ
のバネ計りに引っかけ、引っ張り破断時の強度を測定し
た。測定箇所はネットの横方向に対し２０点を測定し算
術平均値とした。(a) Strength net filament 1. Maximum possible load for 1 kg measurement
The strength at the time of tensile breakage was measured by hooking it on a spring scale. Measurements were made at 20 points in the lateral direction of the net, and the arithmetic mean value was taken as the measurement point.
（ｂ）戻り性
延伸倍率を２倍にした以外は前記（イ）の条件で製造し
たメルトフローレートが０．５ｇ／１０分、酢酸ビニル
含量５重１鴬のエチレン・酢酸ビニル共重合体単独量の
押出延伸ネットを比較量とし、このネットの戻り性との
相対比較数で判定した。(b) Return properties Melt flow rate was 0.5 g/10 min, produced under the conditions of (a) above except that the stretching ratio was doubled, and an ethylene/vinyl acetate copolymer alone with a vinyl acetate content of 5 parts and 1 part. A quantity of extruded stretched net was used as a comparative quantity, and judgment was made based on the relative number of comparisons with the return property of this net.
（Ｃ）外観
ネットを手で広げネット目の交点が充分に融着されず交
点が外れたもの、あるいは一部のみ融着されただけの不
完全な融着状態であることが目視にて観察されたとき判
定を「悪」、そうでないときの判定を「良」と、した。(C) Appearance: Spread the net by hand and visually observe that the intersections of the mesh are not fully fused and the intersections have come off, or that the fusion is incomplete with only a portion fused. The judgment was made as ``bad'' when the condition was met, and the judgment as ``good'' when it was not.
（ｄ）ネット切れ
ネットの成形延伸時に樹脂の延展性不足により延伸切れ
が発生したものについては判定を「有」とし、そうでな
い場合の判定を「無」とした。(d) Net breakage If a stretch breakage occurred due to insufficient ductility of the resin during the forming and stretching of the net, the judgment was made as "Yes", and in other cases, the judgment was made as "No".
実施例２
第１表に示すようにポリオレフィン組成物の組成及び成
形条件（延伸倍率）を変えたこと以外は実施例１と同様
に行なった。Example 2 The same procedure as Example 1 was carried out except that the composition of the polyolefin composition and the molding conditions (stretching ratio) were changed as shown in Table 1.
比較例１〜７
第１表に示すようにポリオレフィン組成物の組成及び成
形条件（延伸倍率）を変えた以外は実施例１を同様に行
なった。Comparative Examples 1 to 7 Example 1 was repeated except that the composition of the polyolefin composition and the molding conditions (stretching ratio) were changed as shown in Table 1.
実施例などにより明らかにした通り１本発明の押出延伸
ネットは従来の包装用押出延伸ネットにない優れた強度
、優れた戻り性及び外観悪化の防止、延伸切れ防止等を
有しており、特に強度については従来の包装用ネットに
ない著しく優れた強度のものが得られ、従来のミカン、
リンゴ、ナシ等の果実包装用ネットとしてばかりでなく
、工業部品の包装用押出延伸ネットとして高強度が必要
とされる分野への展開が可能となった。また、ネット目
付は量の削減、すなわち大幅な製造コストの低下を行な
うことができ、そのうえ、従来より製造時の問題とされ
ていた外観悪化、延伸切れ等の問題がないので、安定生
産性の点からも極めて優れており、工業的に極めて有用
なものである。As clarified by Examples and the like, the extruded stretched net of the present invention has excellent strength, excellent return properties, prevention of appearance deterioration, and prevention of stretching breakage, which are not found in conventional extruded stretched nets for packaging. In terms of strength, it has significantly superior strength that conventional packaging nets do not have, and is superior to conventional mandarin oranges,
It has become possible to use this product not only as a net for packaging fruits such as apples and pears, but also as an extruded stretched net for packaging industrial parts in fields where high strength is required. In addition, the net basis weight can be reduced, which means a significant reduction in manufacturing costs.Furthermore, there are no problems such as deterioration of appearance or stretching breakage, which have traditionally been problems during manufacturing, resulting in stable productivity. It is extremely excellent from this point of view as well, and is extremely useful industrially.
Claims (1)
、酢酸ビニル含量が１〜５０重量％であるチレン・酢酸
ビニル共重合体（Ａ）２０〜９０重量％に、メルトフロ
ーレートが０．０５〜５ｇ／１０分、密度が０．９３０
ｇ／ｃｍ＾３以下で、かつ、ダイスウエル比が１．４以
上である線状低密度ポリエチレン（Ｂ）７５〜５重量％
と、メルトフローレートが０．０５〜５ｇ／１０分、密
度が０．９３０ｇ／ｃｍ＾３以下で、かつダイスウエル
比が１．３以下である線状低密度ポリエチレン（Ｃ）７
５〜５重量％とを配合した組成物を製網し、３倍以上の
倍率で延伸してなることを特徴とする押出延伸ネット。(1) A tyrene/vinyl acetate copolymer (A) having a melt flow rate of 0.05 to 10 g/10 min and a vinyl acetate content of 1 to 50 weight % is added to 20 to 90 weight % of the melt flow rate of 0.05 to 10 g/10 min. 05-5g/10min, density 0.930
75 to 5% by weight of linear low-density polyethylene (B) with g/cm^3 or less and a die well ratio of 1.4 or more
and a linear low density polyethylene (C) 7 having a melt flow rate of 0.05 to 5 g/10 min, a density of 0.930 g/cm^3 or less, and a die swell ratio of 1.3 or less.
An extrusion stretched net, characterized in that it is produced by making a net from a composition containing 5 to 5% by weight and stretching it at a magnification of 3 times or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62108148A JPS63275769A (en) | 1987-04-30 | 1987-04-30 | Extruded stretched net |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62108148A JPS63275769A (en) | 1987-04-30 | 1987-04-30 | Extruded stretched net |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63275769A true JPS63275769A (en) | 1988-11-14 |
| JPH0130944B2 JPH0130944B2 (en) | 1989-06-22 |
Family
ID=14477161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62108148A Granted JPS63275769A (en) | 1987-04-30 | 1987-04-30 | Extruded stretched net |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63275769A (en) |
-
1987
- 1987-04-30 JP JP62108148A patent/JPS63275769A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130944B2 (en) | 1989-06-22 |
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