JP2000309020A - Stretch molding polyethylene raw fabric sheet and manufacture of oriented polyethylene sheet - Google Patents
Stretch molding polyethylene raw fabric sheet and manufacture of oriented polyethylene sheetInfo
- Publication number
- JP2000309020A JP2000309020A JP11342171A JP34217199A JP2000309020A JP 2000309020 A JP2000309020 A JP 2000309020A JP 11342171 A JP11342171 A JP 11342171A JP 34217199 A JP34217199 A JP 34217199A JP 2000309020 A JP2000309020 A JP 2000309020A
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- Prior art keywords
- sheet
- polyethylene
- raw
- stretch molding
- temperature
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は延伸成型用ポリエチ
レン原反シート及び延伸ポリエチレンシートの製造方法
に関する。The present invention relates to a raw polyethylene sheet for stretch molding and a method for producing a stretched polyethylene sheet.
【０００２】[0002]
【従来の技術】従来より、ガラス繊維強化シートは、合
成樹脂シートにガラス繊維を組み合わせることにより得
られ、このような構成によって機械的強度が高められる
ため、各種構造材、建材、成形材などに広く用いられて
いる。この種のガラス繊維強化シートとしては、例え
ば、特公昭６３−６７４４６号公報に、一方向に伸びる
ように配列されたガラス長繊維を粉末状の熱可塑性樹脂
を用いて結合させ、シート状としたガラス繊維プリプレ
グシートが開示されている。2. Description of the Related Art Conventionally, glass fiber reinforced sheets have been obtained by combining glass fibers with synthetic resin sheets, and the mechanical strength is increased by such a structure. Widely used. As this type of glass fiber reinforced sheet, for example, Japanese Patent Publication No. 63-67446 discloses a sheet-like sheet formed by bonding glass long fibers arranged so as to extend in one direction by using a powdery thermoplastic resin. A glass fiber prepreg sheet is disclosed.
【０００３】しかしながら、上記ガラス繊維強化シート
を製造する際に、ガラス繊維を緊張させた状態で樹脂中
に供給し、ガラス繊維に樹脂を含浸させる工程を経なけ
ればならないため、製造工程が煩雑であった。さらに、
ガラス繊維を緊張させた状態で一方向に連続的に巻き取
りながら各工程に搬送するため、ガラス繊維が切断した
り、毛羽立ったガラス繊維により皮膚刺激を起こすとい
う問題点があった。However, when manufacturing the glass fiber reinforced sheet, it is necessary to supply the glass fiber in a tensioned state to the resin and to impregnate the glass fiber with the resin, so that the manufacturing process is complicated. there were. further,
Since the glass fiber is transported to each process while being continuously wound in one direction while being tensioned, there is a problem that the glass fiber is cut or skin irritation is caused by the fluffy glass fiber.
【０００４】これに対して、ガラス繊維を使用すること
なく、素材の耐熱性や機械的強度を改善する方法が、特
開昭６３−１３５４２９号公報に開示されている。この
方法は、ポリエチレンとポリプロピレンとからなるゲル
状混合物に延伸及び架橋処理を施すことによって、ポリ
エチレン分子鎖をある方向に配向させた状態で架橋させ
た延伸成形体を製造するものであり、得られる延伸成形
体は耐熱性及び機械的強度に優れると記載されている。On the other hand, Japanese Patent Application Laid-Open No. 63-135429 discloses a method for improving the heat resistance and mechanical strength of a material without using glass fibers. This method is intended to produce a stretched molded article which is crosslinked in a state where a polyethylene molecular chain is oriented in a certain direction by subjecting a gel-like mixture composed of polyethylene and polypropylene to stretching and crosslinking. It is described that the stretch molded article has excellent heat resistance and mechanical strength.
【０００５】しかしながら、上記延伸成形体の製造に際
しては、デカリン等の溶媒を必要とする、いわゆるゲル
紡糸法が用いられている。例えば、超高分子量ポリエチ
レン及びポリプロピレンのパウダーを加熱溶媒中に溶解
させて急冷することによりゲル化し、得られたゲルから
溶媒を除去したものを原料とし、さらに加熱や延伸を行
なう必要があった。その結果、製造工程が煩雑になり、
コスト高になるという問題点があった。[0005] However, in the production of the stretched molded article, a so-called gel spinning method which requires a solvent such as decalin is used. For example, it is necessary to dissolve powders of ultrahigh molecular weight polyethylene and polypropylene in a heating solvent and rapidly cool them to form a gel. The obtained gel is obtained by removing the solvent, and it is necessary to further heat and stretch. As a result, the manufacturing process becomes complicated,
There was a problem that the cost was high.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記問題点
に鑑み、ガラス繊維強化シートと同等の機械的強度を有
する延伸ポリエチレンシートを得るために使用される延
伸成型用ポリエチレン原反シートの製造方法、及び、そ
れを用いた延伸ポリエチレンシートの製造方法を提供す
ることを目的とする。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to produce a raw polyethylene sheet for stretch molding used to obtain a stretched polyethylene sheet having the same mechanical strength as a glass fiber reinforced sheet. It is an object of the present invention to provide a method and a method for producing a stretched polyethylene sheet using the same.
【０００７】[0007]
【課題を解決するための手段】請求項１記載の発明は、
ポリエチレンを溶融成形してシート状に賦形した後冷却
固化する延伸成型用ポリエチレン原反シートの製造方法
において、該シート状物を冷却固化する過程で融点より
０〜２０℃低い温度領域で一定時間保持されてなる延伸
成型用ポリエチレン原反シートの製造方法である。According to the first aspect of the present invention,
In a method for producing a raw polyethylene sheet for stretch molding, wherein polyethylene is melt-formed and shaped into a sheet, and then cooled and solidified, in the process of cooling and solidifying the sheet-like material, a predetermined time is maintained in a temperature range of 0 to 20 ° C. lower than the melting point. This is a method for producing a stretched raw polyethylene sheet for stretching.
【０００８】請求項２記載の発明は、請求項１記載の延
伸成型用ポリエチレン原反シートを圧延した後に、延伸
されてなる請求項１記載の延伸ポリエチレンシートの製
造方法である。The invention according to claim 2 is the method for producing a stretched polyethylene sheet according to claim 1, wherein the raw polyethylene sheet for stretch molding is rolled and then stretched.
【０００９】請求項３記載の発明は、延伸成型用ポリエ
チレン原反シートが、成形されてから圧延される迄の
間、８０℃以上、融点以下の温度に保持されてなる請求
項２記載の延伸ポリエチレンシートの製造方法である。According to a third aspect of the present invention, the raw polyethylene sheet for stretch molding is maintained at a temperature of 80 ° C. or higher and a melting point or lower during a period from molding to rolling. This is a method for producing a polyethylene sheet.
【００１０】請求項４記載の発明は、ポリエチレンが、
融点が６０℃以下であるα‐オレフィン共重合体を含有
してなる請求項１〜３いずれかに記載の延伸成型用ポリ
エチレン原反シート又は延伸ポリエチレンシートの製造
方法である。The invention according to claim 4 is characterized in that the polyethylene is
The method for producing a raw polyethylene sheet for stretch molding or a stretched polyethylene sheet according to any one of claims 1 to 3, which comprises an α-olefin copolymer having a melting point of 60 ° C or less.
【００１１】本発明で用いられるポリエチレンとして
は、重量平均分子量が５０万以下の、いわゆる汎用ポリ
エチレンが挙げられる。重量平均分子量が５０万を超え
ると、高倍率延伸が可能であり、その結果高強度及び高
弾性率を発現できるが、押出成形が難しくなり、かつ高
倍率延伸には溶剤等の可塑剤を必要とするため、製造工
程が煩雑となり好ましくない。特に重量平均分子量が１
００万以上の超高分子量ポリエチレンでは、この傾向が
より一層著しくなる。The polyethylene used in the present invention includes so-called general-purpose polyethylene having a weight average molecular weight of 500,000 or less. When the weight average molecular weight exceeds 500,000, high draw ratio is possible, and as a result, high strength and high elastic modulus can be exhibited. However, extrusion molding becomes difficult, and a plasticizer such as a solvent is required for high draw ratio. Therefore, the manufacturing process becomes complicated, which is not preferable. In particular, the weight average molecular weight is 1
This tendency becomes even more pronounced with ultrahigh molecular weight polyethylenes of over one million.
【００１２】上記ポリエチレンの融点は、通常１２５〜
１４０℃のものが好ましく用いられ、更に好ましくは１
３０〜１４０℃のものが好ましく用いられる。The melting point of the above polyethylene is usually from 125 to
140 ° C. is preferably used, and more preferably 1 ° C.
Those having a temperature of 30 to 140 ° C are preferably used.
【００１３】上記ポリエチレンのメルトインデックス
（ＭＩ）は、小さくなると押出機等の成形機に負担が掛
かり過ぎ、逆に大きくなると延伸性が低下するので、
０．１〜２０が好ましい。上記ＭＩは、ＪＩＳ Ｋ６７
６０に準拠して測定される値である。[0013] When the melt index (MI) of the polyethylene is small, the load on a molding machine such as an extruder is excessively increased, and when the melt index (MI) is large, the stretchability decreases.
0.1-20 is preferable. The above MI is JIS K67
It is a value measured according to 60.
【００１４】上記ポリエチレンはの密度は、０．９４ｇ
／ｃｍ3 以上が好ましく、所謂高密度ポリエチレンが好
適に用いられる。ポリエチレンの密度が０．９４ｇ／ｃ
ｍ3 未満になると、延伸加工による機械的強度及び弾
性率の向上が効果が低下する。The above polyethylene has a density of 0.94 g.
/ Cm 3 or more, and so-called high-density polyethylene is suitably used. The density of polyethylene is 0.94g / c
When it is less than m 3, the effect of improving the mechanical strength and the elastic modulus by the stretching process is reduced.
【００１５】上記ポリエチレンは単独で用いられてもよ
く、ポリエチレンと相溶しうる他の樹脂を混合して使用
してもよく、例えば、ポリエチレンと相溶しうるもので
あれば、ポリオレフィン系樹脂であっても、ポリオレフ
ィン系以外の樹脂であってもよい。これらの樹脂の内、
α‐オレフィン共重合体が好適に用いられる。The above-mentioned polyethylene may be used alone, or may be used by mixing with another resin compatible with polyethylene. For example, if the polyethylene is compatible with polyethylene, a polyolefin resin may be used. Or a resin other than a polyolefin resin. Of these resins,
α-olefin copolymers are preferably used.
【００１６】上記α‐オレフィン共重合体としては、エ
チレン、プロピレン、１‐ブテン、１‐ペンテン等のα
‐オレフィンの２種以上からなる共重合体が挙げられる
が、同様な化学構造を有する物であれば上記共重合体に
限定されない。例えば、ポリブタジエン、ポリイソプレ
ン等の非共役ジエン系樹脂に含まれる２重結合の１部又
は全部に水素添加して得られる樹脂等が挙げられる。上
記α‐オレフィン共重合体には、例えば、酢酸ビニル、
ビニルアルコール、（メタ）アクリル酸、（メタ）アク
リル酸エステル等が１０重量％以下含有されていても良
い。Examples of the α-olefin copolymer include α, such as ethylene, propylene, 1-butene, and 1-pentene.
Copolymers composed of two or more olefins, but are not limited to the above copolymers as long as they have the same chemical structure. For example, resins obtained by hydrogenating part or all of the double bonds contained in non-conjugated diene resins such as polybutadiene and polyisoprene are exemplified. The α-olefin copolymer includes, for example, vinyl acetate,
Vinyl alcohol, (meth) acrylic acid, (meth) acrylate and the like may be contained in an amount of 10% by weight or less.
【００１７】上記α‐オレフィン共重合体の重量平均分
子量は１０万以下が好ましい。重量平均分子量が１０万
を越えると、ポリエチレンへの分散性が低下し、延伸成
形性の向上が困難になり、本発明の効果が低下する上記
α‐オレフィン共重合体の融点は６０℃以下が好まし
い。６０℃において溶融状態もしくは溶液状態になるα
‐オレフィン共重合体を使用することにより、延伸成形
性が良好で、高延伸倍率の延伸シートが容易に得られる
ようになる。The weight average molecular weight of the α-olefin copolymer is preferably 100,000 or less. If the weight average molecular weight exceeds 100,000, the dispersibility in polyethylene decreases, it becomes difficult to improve stretch moldability, and the melting point of the α-olefin copolymer, which reduces the effect of the present invention, is 60 ° C. or less. preferable. Α that becomes molten or solution at 60 ° C
-By using an olefin copolymer, a stretched sheet having good stretchability and a high stretch ratio can be easily obtained.
【００１８】上記α‐オレフィン共重合体の量は、ポリ
エチレン１００重量部に対して、０. １〜５０重量部が
好ましい。更に好ましくは、０. ５〜２０重量部であ
る。α‐オレフィン共重合体が０. １重量部未満の場合
は添加効果があまり認められず、５０重量部を越える
と、延伸しても高強度のシートを得るのが困難となる。The amount of the α-olefin copolymer is preferably 0.1 to 50 parts by weight based on 100 parts by weight of polyethylene. More preferably, it is 0.5 to 20 parts by weight. If the amount of the α-olefin copolymer is less than 0.1 part by weight, the effect of addition is not so noticeable. If the amount exceeds 50 parts by weight, it becomes difficult to obtain a high-strength sheet even when stretched.
【００１９】上記ポリエチレンには、成形に際して、結
晶核剤、架橋剤、架橋助剤、滑剤、充填剤、顔料、低分
子量ポリオレフィンワックス等が必要に応じて適宜添加
されても良い。At the time of molding, a nucleating agent, a cross-linking agent, a cross-linking aid, a lubricant, a filler, a pigment, a low-molecular-weight polyolefin wax, and the like may be appropriately added to the above polyethylene when necessary.
【００２０】上記ポリエチレンを押出機等で溶融成形し
シート化する場合、その溶融温度は１３０℃以上、２５
０℃以下が好ましく、より好ましくは１５０℃以上、２
３０℃以下である。溶融温度が１３０℃未満になると、
特に、高密度ポリエチレンの場合は溶融が不完全とな
り、押出機等の成形機に負荷がかかり過ぎることがあ
り、２５０℃を超える温度で溶融成形するとポリエチレ
ンが分解して変色等を起こしたり、分子量の低下に伴う
強度低下等を招く恐れがある。When the above polyethylene is melt-molded into a sheet by an extruder or the like, the melting temperature is 130 ° C. or more, 25 ° C.
0 ° C. or less, more preferably 150 ° C. or more,
30 ° C. or less. When the melting temperature is lower than 130 ° C,
In particular, in the case of high-density polyethylene, melting is incomplete, and a molding machine such as an extruder may be overloaded. When melt-molded at a temperature exceeding 250 ° C., polyethylene is decomposed to cause discoloration, etc. There is a possibility that the strength may be reduced due to the decrease in the strength.
【００２１】上記ポリエチレンを溶融成形して延伸成型
用ポリエチレン原反シートに成形する方法としては、特
に限定されず、プラスチックシートの成形で一般に行な
われているロール成形法、カレンダー成形法、押出成形
法等が用いられる。The method for melt-molding the above polyethylene to form a raw polyethylene sheet for stretch molding is not particularly limited, and the roll forming method, calender forming method, extrusion forming method generally used for forming a plastic sheet is used. Are used.
【００２２】上記延伸成型用ポリエチレン原反シートの
厚さは２〜１５ｍｍが好ましい。厚さが、２ｍｍ未満に
なると延伸後のシートの厚さが薄くなり過ぎ、１５ｍｍ
を超えると以後の工程における加工が困難になる。The thickness of the raw polyethylene sheet for stretch molding is preferably 2 to 15 mm. If the thickness is less than 2 mm, the thickness of the sheet after stretching becomes too thin,
If it exceeds, processing in subsequent steps becomes difficult.
【００２３】上記延伸成型用ポリエチレン原反シートの
成形工程においては、冷却固化する過程で、シート状に
賦形後の溶融状態にあるポリエチレンが、該ポリエチレ
ンの融点より０〜２０℃低い温度領域で一定時間保持さ
れる。前記温度領域で一定時間保持され熱処理が行なわ
れることによって、延伸成型用ポリエチレン原反シート
の延伸特性が向上し、高延伸倍率の延伸が可能となる。In the step of forming the raw polyethylene sheet for stretch-molding, in the process of cooling and solidifying, the polyethylene in a molten state after being formed into a sheet is cooled in a temperature range of 0 to 20 ° C. lower than the melting point of the polyethylene. It is held for a certain time. By performing the heat treatment while maintaining the temperature in the above-mentioned temperature range for a certain period of time, the stretching characteristics of the raw polyethylene sheet for stretch molding are improved, and stretching at a high stretching ratio becomes possible.
【００２４】上記熱処理の時間はその熱処理温度によっ
て異なるが、好ましくは少なくとも５分間以上、より好
ましくは１５分間以上である。また、上記熱処理時間は
熱処理温度が低くなるほど短くしてもよいが、熱処理温
度が融点より２０℃を超えて低い温度領域になると、本
発明の効果が期待できなくなる。The heat treatment time varies depending on the heat treatment temperature, but is preferably at least 5 minutes or more, more preferably 15 minutes or more. The heat treatment time may be shorter as the heat treatment temperature is lower. However, if the heat treatment temperature is lower than the melting point by more than 20 ° C., the effect of the present invention cannot be expected.
【００２５】上記熱処理の方法は、上記の条件を満たし
ておれば、任意の方法を採用することができる。例え
ば、上記温度領域に温調された加熱炉で延伸成型用ポリ
エチレン原反シートを保持してもよく、上記温度領域に
温調されたロールやプレス板で延伸成型用ポリエチレン
原反シートを挟み込んで保持してもよい。As the method of the heat treatment, any method can be adopted as long as the above conditions are satisfied. For example, the stretch-formed polyethylene raw sheet may be held in a heating furnace whose temperature is controlled in the temperature range, and the stretch-formed polyethylene raw sheet is sandwiched between rolls or press plates whose temperature is controlled in the temperature range. May be retained.
【００２６】上記熱処理が施された延伸成型用ポリエチ
レン原反シートは、熱処理後に引続いて延伸工程に搬送
されても良く、延伸工程に移る前に融点以下の温度であ
れば任意の温度で保管されても良い、好ましくは、熱処
理後延伸されるまでの間、８０℃以上、融点以下に保持
されるのが好ましい。更に好ましくは、１００℃以上、
１２５℃以下に保持されるのが好ましい。熱処理後、８
０℃以上、融点以下に保持されることにより、圧延、延
伸特性が更に向上し、高倍率の延伸シートがより得られ
やすくなる。８０℃以上に保持する方法としては特に限
定されず、例えば、熱処理後、すぐに延伸をしても良い
し、８０℃以上に保たれた加熱炉中で保持しても良い
し、８０℃以上に温度調節されたロールやプレスに挟ん
で保持しても良い。The heat-treated stretch-formed polyethylene raw sheet may be subsequently conveyed to the stretching step after the heat treatment, and may be stored at any temperature below the melting point before proceeding to the stretching step. It is preferable that the temperature is maintained at 80 ° C. or higher and the melting point or lower until stretching after the heat treatment. More preferably, 100 ° C. or higher,
It is preferable that the temperature is kept at 125 ° C. or lower. After heat treatment, 8
By maintaining the temperature at 0 ° C. or higher and the melting point or lower, rolling and stretching characteristics are further improved, and a stretched sheet with a high magnification can be more easily obtained. The method of maintaining the temperature at 80 ° C. or higher is not particularly limited. For example, the film may be stretched immediately after the heat treatment, may be maintained in a heating furnace maintained at 80 ° C. or higher, or may be 80 ° C. or higher. May be held between rolls or presses whose temperature has been adjusted.
【００２７】上記延伸成型用ポリエチレン原反シートは
比較的厚いため、延伸に先立って圧延処理が施されるの
が好ましい。上記圧延処理は、例えば、上記延伸成型用
ポリエチレン原反シートの厚みよりもクリアランスを狭
くした一対の互いに反対方向に回転する圧延ロール間に
延伸成型用ポリエチレン原反シートを挿入し、該延伸成
型用ポリエチレン原反シートの厚みを減少させると共に
長さ方向に伸長させることによって行なわれる。Since the above-mentioned raw polyethylene sheet for stretch molding is relatively thick, it is preferable to perform a rolling treatment before stretching. The rolling process is, for example, inserting a raw polyethylene sheet for stretch molding between a pair of rolling rolls rotating in opposite directions with a clearance narrower than the thickness of the raw polyethylene sheet for stretch molding, This is performed by reducing the thickness of the raw polyethylene sheet and elongating it in the length direction.
【００２８】上記圧延処理が施される際の延伸成型用ポ
リエチレン原反シートの温度は、７０〜１２５℃が好ま
しく、より好ましくは９０〜１２０℃である。温度が、
７０℃未満になると原反シートを圧延する際に大きな圧
下力を与える必要があるため均一な圧延が困難になり、
１２５℃を超えると延伸成型用ポリエチレン原反シート
が圧延中に溶融切れを起こすことがある。The temperature of the raw stretched polyethylene sheet at the time of performing the above-mentioned rolling treatment is preferably 70 to 125 ° C, more preferably 90 to 120 ° C. temperature,
If the temperature is lower than 70 ° C., it is necessary to apply a large rolling force when rolling the raw sheet, so that uniform rolling becomes difficult,
If the temperature exceeds 125 ° C., the raw polyethylene sheet for stretch molding may be cut off during rolling.
【００２９】上記圧延工程における圧延倍率は、２〜１
０倍が好ましい。圧延倍率が小さくなると圧延の効果が
期待できないばかりでなく、後の延伸工程に負担がかか
り、大きくなると原反シートを圧延する際に大きな圧下
力を与える必要があるため均一な圧延が困難となるばか
りでなく、圧延後の延伸成型用ポリエチレン原反シート
の厚みが薄くなりすぎて、以後の延伸工程中において延
伸成型用ポリエチレン原反シートが切断する恐れがあ
る。尚、圧延倍率は下記の式で定義される。圧延倍率＝
圧延前の延伸成型用ポリエチレン原反シートの断面積／
圧延後の延伸成型用ポリエチレン原反シートの断面積The rolling ratio in the above rolling step is 2 to 1
0 times is preferred. When the rolling ratio becomes small, not only the effect of the rolling cannot be expected, but also a burden is applied to the subsequent stretching step, and when the rolling ratio becomes large, it is necessary to apply a large rolling force when rolling the raw sheet, so that uniform rolling becomes difficult. In addition, the thickness of the stretched raw polyethylene sheet after rolling may be too small, and the raw stretchable polyethylene sheet may be cut during the subsequent stretching process. The rolling ratio is defined by the following equation. Rolling ratio =
Sectional area of raw polyethylene sheet for stretch molding before rolling /
Cross-sectional area of raw polyethylene sheet for stretch molding after rolling
【００３０】上記圧延後の延伸成型用ポリエチレン原反
シートを延伸する方法としては、一般に行なわれている
１軸延伸法が用いられる。１軸延伸法としては、例え
ば、延伸成型用ポリエチレン原反シートを加熱した状態
で速度の異なる２対のピンチロール（繰出しロールと引
取りロール）間に挟んで引張ることにより、１軸方向の
みに強く配向させる方法が挙げられる。この場合、繰出
しロールと引取りロールとの表面速度比（引取りロール
／繰出しロール）が延伸倍率となる。延伸ポリエチレン
シートの延伸倍率は２〜１０倍が好ましい。As a method for stretching the raw polyethylene sheet for stretch molding after the above-mentioned rolling, a commonly used uniaxial stretching method is used. In the uniaxial stretching method, for example, a raw polyethylene sheet for stretch molding is pulled while being sandwiched between two pairs of pinch rolls (feeding roll and take-up roll) having different speeds in a heated state. There is a method of strongly aligning. In this case, the ratio of the surface speed between the pay-out roll and the take-up roll (draw-up roll / feed-out roll) is the draw ratio. The stretch ratio of the stretched polyethylene sheet is preferably 2 to 10 times.
【００３１】上記延伸工程における、延伸成型用ポリエ
チレン原反シートの温度は、７０〜１２０℃の範囲が好
ましい。７０℃未満又は１２０℃を超える温度では、延
伸工程中にシート切れを起こすことがある。In the stretching step, the temperature of the raw polyethylene sheet for stretch molding is preferably in the range of 70 to 120 ° C. If the temperature is lower than 70 ° C. or higher than 120 ° C., the sheet may break during the stretching process.
【００３２】本発明において、総延伸倍率は上記圧延倍
率と延伸倍率との積より求められる。 上記総延伸倍率
が、小さくなると得られる延伸ポリエチレンシートの剛
性等の機械的強度が低下するので、２０倍以上が好まし
く、より好ましくは３０倍以上である。In the present invention, the total stretching ratio is determined from the product of the above-mentioned rolling ratio and stretching ratio. Since the mechanical strength such as the rigidity of the obtained stretched polyethylene sheet decreases as the total stretching ratio decreases, it is preferably 20 times or more, more preferably 30 times or more.
【００３３】[0033]
【発明の実施の形態】以下、実施例を掲げて、本発明を
更に詳しく説明する。 （実施例１）高密度ポリエチレン（日本ポリケム社製
「ＨＹ５４０」、重量平均分子量：３３万 、ＭＩ：
１．０、融点：１３５℃）を、表面温度が１８０℃に制
御されたプレス機を用いて、プレス圧５ｋｇ／ｃｍ2 で
５分間プレスし、シート化した後、表面温度が１２０℃
に制御されたプレス機を用いてプレス圧５ｋｇ／ｃｍ2
で５分間熱処理し、さらに水冷プレス機を用いてプレス
圧５ｋｇ／ｃｍ2 でプレス成形しながら冷却して、ポリ
エチレン延伸成型用ポリエチレン原反シートを得た。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples. (Example 1) High-density polyethylene ("HY540" manufactured by Nippon Polychem Co., Ltd., weight average molecular weight: 330,000, MI:
1.0, melting point: 135 ° C.) using a press machine controlled at a surface temperature of 180 ° C. for 5 minutes at a pressing pressure of 5 kg / cm 2 to form a sheet.
Pressure of 5 kg / cm 2 using a press machine controlled to
For 5 minutes, and then cooled while press-molding with a water-cooled press at a pressure of 5 kg / cm 2 to obtain a raw polyethylene sheet for polyethylene stretch molding.
【００３４】得られた延伸成型用ポリエチレン原反シー
トを、１１５℃に加熱した熱ロール（小平製作所製、ロ
ール径６インチ）を用いて、圧延倍率１０倍に圧延し
た。次いで、圧延処理した延伸成型用ポリエチレン原反
シートを、熱風加熱式延伸機を用いて温度１００℃にて
延伸することにより、総延伸倍率３２倍の延伸ポリエチ
レンシートを得た。The obtained raw polyethylene sheet for stretch molding was rolled to a rolling magnification of 10 times using a hot roll heated to 115 ° C. (Roll diameter: 6 inches, manufactured by Kodaira Seisakusho). Next, the rolled polyethylene raw sheet for stretch molding was stretched at a temperature of 100 ° C. using a hot-air heating stretching machine to obtain a stretched polyethylene sheet having a total stretch ratio of 32 times.
【００３５】（実施例２）表面温度１２０℃に制御され
たプレス機を用いて、圧力５ｋｇ／ｃｍ2 で３０分間熱
処理したこと以外は、実施例１と同様にして成形を行
い、総延伸倍率３３倍の延伸ポリエチレンシートを得
た。(Example 2) Molding was performed in the same manner as in Example 1 except that a heat treatment was performed at a pressure of 5 kg / cm 2 for 30 minutes using a press machine controlled to a surface temperature of 120 ° C, and a total stretching ratio was obtained. A 33 times stretched polyethylene sheet was obtained.
【００３６】（実施例３）表面温度１８０℃に制御され
たプレス機を用いて、圧力５ｋｇ／ｃｍ2 で５分間プレ
ス成形し、シート化した後、表面温度１２５℃に制御さ
れたプレス機を用いて圧力５ｋｇ／ｃｍ2 で３０分間熱
処理したこと以外は、実施例１と同様にして成形を行
い、総延伸倍率３５倍の延伸ポリエチレンシートを得
た。Example 3 Using a press machine controlled at a surface temperature of 180 ° C., press-forming at a pressure of 5 kg / cm 2 for 5 minutes, forming a sheet, and then using a press machine controlled at a surface temperature of 125 ° C. Molding was carried out in the same manner as in Example 1 except that heat treatment was performed at a pressure of 5 kg / cm 2 for 30 minutes to obtain a stretched polyethylene sheet having a total stretch ratio of 35 times.
【００３７】（実施例４）表面温度が１２０℃に制御さ
れたプレス機でのプレス成形に引き続き、１１５℃に加
熱した熱ロールによる圧延を行った以外は実施例１と同
様して成形を行い、総延伸倍率３６倍の延伸ポリエチレ
ンシートを得た。(Example 4) Forming was carried out in the same manner as in Example 1 except that rolling was performed by a hot roll heated to 115 ° C, followed by press forming with a press machine whose surface temperature was controlled to 120 ° C. Thus, a stretched polyethylene sheet having a total stretch ratio of 36 times was obtained.
【００３８】（実施例５）高密度ポリエチレン（日本ポ
リケム社製「ＨＹ５４０」、重量平均分子量：３３万
、ＭＩ：１．０、融点：１３５℃）１００重量部に、
エチレン‐プロピレン共重合体（ユニロイヤルケミカル
社製「ＴＲＩＬＥＮＥ ＣＰ４０」、重量平均分子量：
２１０００、６０℃における粘度：２１０ポイズ（液
状））１. ０重量部を添加する以外は、実施例１と同様
に成形を行い、総延伸倍率３８倍の延伸ポリエチレンシ
ートを得た。Example 5 High-density polyethylene (“HY540” manufactured by Nippon Polychem Co., Ltd., weight average molecular weight: 330,000)
, MI: 1.0, melting point: 135 ° C.)
Ethylene-propylene copolymer (“TRILENE CP40” manufactured by Uniroyal Chemical Co., weight average molecular weight:
Molding was carried out in the same manner as in Example 1 except that 1.0 part by weight (viscosity at 21000 and 60 ° C .: 210 poise (liquid)) was added to obtain a stretched polyethylene sheet having a total stretch ratio of 38 times.
【００３９】（比較例１）表面温度１２０℃に制御され
たプレス機を用いて、プレス成形による熱処理を行なわ
なかったこと以外は、実施例１と同様にして成形を行
い、総延伸倍率２６倍の延伸ポリエチレンシートをを得
た。(Comparative Example 1) Molding was performed in the same manner as in Example 1 except that heat treatment by press molding was not performed using a press machine controlled to a surface temperature of 120 ° C, and the total stretching ratio was 26 times. Was obtained.
【００４０】上記実施例１〜５及び比較例１で得られた
延伸ポリエチレンシートにつき、ＪＩＳ Ｋ ７１１３
に準拠して引張強度及び引張弾性率を測定し、その結果
を表１に示した。With respect to the stretched polyethylene sheets obtained in Examples 1 to 5 and Comparative Example 1, JIS K 7113 was used.
The tensile strength and the tensile modulus were measured in accordance with Table 1. The results are shown in Table 1.
【００４１】[0041]
【表１】 [Table 1]
【００４２】[0042]
【発明の効果】請求項１記載の発明は、ポリエチレンを
溶融成形してシート状物に賦形した後冷却固化する延伸
成型用原反シートの製造方法において、該シート状物を
冷却固化する過程で融点より０〜２０℃低い温度領域で
一定時間保持されてなるので、３０倍以上の高延伸が可
能な延伸成型用ポリエチレン原反シートが得られる。請
求項２に記載の発明は、請求項１記載の延伸成型用ポリ
エチレン原反シートを圧延した後に延伸するので、高延
伸倍率の機械的強度に優れた延伸ポリエチレンシートが
得られる。請求項３記載の発明は、請求項２において、
原反シートが、成形されてから圧延される迄の間、８０
℃以上、融点以下の温度に保持されているので、請求項
２記載の効果をより確実に奏することができる。請求項
４記載の発明は、ポリエチレンが、融点が６０℃以下の
α‐オレフィン共重合体を含有してなるので、請求項１
〜３記載の効果をより確実に奏することができる。According to the first aspect of the present invention, there is provided a method for producing a raw sheet for stretch molding, wherein polyethylene is melt-molded, shaped into a sheet, and then cooled and solidified. At a temperature lower than the melting point by 0 to 20 ° C. for a certain period of time, so that a raw polyethylene sheet for stretch molding capable of being stretched 30 times or more is obtained. According to the second aspect of the invention, the raw polyethylene sheet for stretch molding according to the first aspect is stretched after being rolled, so that a stretched polyethylene sheet having high mechanical strength at a high stretching ratio can be obtained. The invention according to claim 3 is based on claim 2,
From the time the raw sheet is formed to the time it is rolled, 80
Since the temperature is maintained at not less than ° C and not more than the melting point, the effect described in claim 2 can be more reliably achieved. According to a fourth aspect of the present invention, the polyethylene contains an α-olefin copolymer having a melting point of 60 ° C. or less.
The effects described in (1) to (3) can be achieved more reliably.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｋ 23:00 Ｂ２９Ｌ 7:00 Ｃ０８Ｌ 23:06 Ｆターム(参考） 4F071 AA15 AA16 AA84 BA01 BB06 BB07 BC01 4F201 AA03E AA04 AG01 AR06 BA03 BA04 BC01 BC02 BC13 BC15 BD10 BM04 BM06 BN01 4F210 AA03 AA04 AG01 AR06 QA03 QC02 QG01 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) B29K 23:00 B29L 7:00 C08L 23:06 F term (Reference) 4F071 AA15 AA16 AA84 BA01 BB06 BB07 BC01 4F201 AA03E AA04 AG01 AR06 BA03 BA04 BC01 BC02 BC13 BC15 BD10 BM04 BM06 BN01 4F210 AA03 AA04 AG01 AR06 QA03 QC02 QG01
Claims (4)
に賦形した後、冷却固化する延伸成型用ポリエチレン原
反シートの製造方法において、該シート状物を冷却固化
する過程で、融点より０〜２０℃低い温度領域で一定時
間保持させてなることを特徴とする延伸成型用ポリエチ
レン原反シートの製造方法。In a method for producing a raw polyethylene sheet for stretch molding, wherein polyethylene is melt-molded and shaped into a sheet, and then cooled and solidified, in the process of cooling and solidifying the sheet, the melting point of the polyethylene is 0 to 0 from the melting point. A method for producing a raw polyethylene sheet for stretch molding, wherein the raw polyethylene sheet is held at a temperature lower by 20 ° C. for a certain period of time.
原反シートを圧延した後、延伸させてなることを特徴と
する延伸ポリエチレンシートの製造方法。2. A method for producing a stretched polyethylene sheet, comprising rolling and stretching the raw polyethylene sheet for stretch molding according to claim 1.
成形されてから圧延される迄の間、８０℃以上、融点以
下の温度に保持されてなることを特徴とする請求項２記
載の延伸ポリエチレンシートの製造方法。3. The raw polyethylene sheet for stretch molding,
3. The method for producing a stretched polyethylene sheet according to claim 2, wherein the temperature is maintained at a temperature of 80 ° C. or higher and a melting point or lower during a period from forming to rolling.
‐オレフィン共重合体を含有してなることを特徴とする
請求項１〜３いずれかに記載の延伸成型用ポリエチレン
原反シート又は延伸ポリエチレンシートの製造方法。4. Polyethylene having an α of not more than 60 ° C.
The method for producing a stretched polyethylene raw sheet or stretched polyethylene sheet according to any one of claims 1 to 3, characterized in that the method comprises-an olefin copolymer.
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| JP11-44929 | 1999-02-23 | ||
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012029881A1 (en) * | 2010-08-31 | 2012-03-08 | 国立大学法人群馬大学 | Method for producing ultra-high-molecular-weight polyethylene porous membrane, method for producing ultra-high-molecular-weight polyethylene film, and porous membrane and film produced by said methods |
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| WO2012029881A1 (en) * | 2010-08-31 | 2012-03-08 | 国立大学法人群馬大学 | Method for producing ultra-high-molecular-weight polyethylene porous membrane, method for producing ultra-high-molecular-weight polyethylene film, and porous membrane and film produced by said methods |
| US8951456B2 (en) | 2010-08-31 | 2015-02-10 | National University Corporation Gunma University | Method for producing ultra-high-molecular-weight polyethylene porous membrane, method for producing ultra-high-molecular-weight polytheylene film, and porous membrane and film obtained by these methods |
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| JP4323650B2 (en) | 2009-09-02 |
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