JP2002067142A - Simultaneously coaxially stretched polyamide film and method for manufacturing the same - Google Patents
Simultaneously coaxially stretched polyamide film and method for manufacturing the sameInfo
- Publication number
- JP2002067142A JP2002067142A JP2000262004A JP2000262004A JP2002067142A JP 2002067142 A JP2002067142 A JP 2002067142A JP 2000262004 A JP2000262004 A JP 2000262004A JP 2000262004 A JP2000262004 A JP 2000262004A JP 2002067142 A JP2002067142 A JP 2002067142A
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- Japan
- Prior art keywords
- stretching
- film
- clip
- ratio
- polyamide film
- Prior art date
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Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は同時二軸延伸ポリア
ミドフィルム及びその製造方法に関し、特に、固有の周
期を持った延伸ムラに起因する物性変動が抑えられた高
品質の同時二軸延伸ポリアミドフィルム及びその製造方
法に関する。更に詳しくは、フィルムの長手方向厚さム
ラ周期を解析し、同時二軸延伸工程で起きるテンターク
リップ間隔固有の厚さムラ周期の存在をなくすことで、
厚さ均一性・機械的特性・熱寸法安定性に優れた品質・
フィルム性能を有するようにした同時二軸延伸ポリアミ
ドフィルム及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous biaxially stretched polyamide film and a method for producing the same, and more particularly, to a high quality simultaneous biaxially stretched polyamide film in which fluctuations in physical properties due to stretching unevenness having a specific period are suppressed. And its manufacturing method. More specifically, by analyzing the thickness unevenness period in the longitudinal direction of the film and eliminating the existence of the thickness unevenness period inherent in the tenter clip interval that occurs in the simultaneous biaxial stretching process,
Excellent quality with excellent thickness uniformity, mechanical properties and thermal dimensional stability
The present invention relates to a simultaneously biaxially stretched polyamide film having film properties and a method for producing the same.
【０００２】[0002]
【従来の技術】二軸延伸ポリアミドフィルムは、包装、
工業、その他の用途に用いられているが、これらの用途
では、近年特にフィルム物性の均一性が厳しく要求され
るようになっている。2. Description of the Related Art Biaxially stretched polyamide films are used for packaging,
It is used for industrial and other uses, and in these uses, in recent years, in particular, uniformity of physical properties of a film has been strictly required.
【０００３】ところで、二軸延伸フィルムを製造する際
には、一般に、押出機より溶融樹脂フィルムを押出し、
冷却ロール上でシート状に冷却成型し、この実質的に無
配向の未延伸フィルムを延伸工程で縦横二軸方向に引き
延ばすことで、充分に分子配向された高強度の二軸延伸
フィルムを得る方式が採用されている。[0003] When a biaxially stretched film is produced, a molten resin film is generally extruded from an extruder.
A method of obtaining a high-strength biaxially stretched film with sufficient molecular orientation by cooling and forming it into a sheet on a cooling roll and stretching this substantially unoriented unstretched film in the stretching process in the longitudinal and transverse biaxial directions. Has been adopted.
【０００４】この延伸工程で生じる機械的延伸ムラやそ
の変動は、厚さムラとして現れると共に、分子配向の違
いによるフィルム物性のムラに繋がる。この延伸ムラや
その変動に起因した物性変化は、直接フィルム生産工程
の弊害に関わらなくても、包装用途の一例としてのフィ
ルム製品の印刷ラミネート加工・製袋充填加工といった
加工工程において、印刷ピッチずれ・蛇行・シール不良
・製袋ムラなどのトラブル発生を招くことになり、また
そのためにフィルム加工製品の品質悪化を招くことにな
る。[0004] The mechanical stretching unevenness and its variation generated in the stretching step appear as thickness unevenness and lead to unevenness in film physical properties due to a difference in molecular orientation. This change in physical properties due to the unevenness in stretching and its fluctuations may cause print pitch deviations in processing steps such as print laminating and bag making and filling of film products as an example of packaging applications, regardless of the adverse effects of the film production process. -Troubles such as meandering, poor sealing, uneven bag making, etc. are caused, and as a result, the quality of film processed products is deteriorated.
【０００５】二軸延伸方法には、縦延伸に引き続き横延
伸する逐次二軸延伸法と縦横同時に延伸する同時二軸延
伸法とがあるが、上記延伸ムラについて、同時二軸延伸
法であるが故の固有の問題がある。The biaxial stretching method includes a sequential biaxial stretching method in which transverse stretching is performed subsequent to longitudinal stretching and a simultaneous biaxial stretching method in which stretching is performed simultaneously in both longitudinal and transverse directions. There are inherent problems.
【０００６】同時二軸延伸法で起きる固有の問題は、未
延伸フィルム端部をクリップで把持して二軸方向に機械
的に引き延ばす機構に基づいて発生する。つまり、縦方
向はクリップ間隔を広げ、横方向はクリップ走行レール
の巾を広げてそれぞれ延伸が行われるため、未延伸フィ
ルム端部のクリップで掴まれ延伸を拘束された部分、又
はあるクリップと隣のクリップとに挟まれた間隙部分に
延伸歪みが起き、この延伸歪みに伴う延伸ムラが周辺部
分にも波及するという問題が挙げられる。[0006] An inherent problem that occurs in the simultaneous biaxial stretching method arises from a mechanism in which the end of the unstretched film is gripped with a clip and mechanically stretched in the biaxial direction. In other words, since the stretching is performed by increasing the clip interval in the longitudinal direction and increasing the width of the clip running rail in the lateral direction, the portion that is gripped by the clip at the end of the unstretched film and restrained from stretching, or adjacent to a certain clip. This causes a problem in that stretching distortion occurs in a gap portion sandwiched between the clips and the stretching, and uneven stretching caused by the stretching distortion spreads to a peripheral portion.
【０００７】ところが、これまで、この問題に対する有
効な解決が図られた、あるいは改良が施された同時二軸
延伸フィルムは、何ら提案されていなかった。二軸延伸
フィルム製品では、上述した、クリップで掴まれ拘束さ
れた部分と、あるクリップと隣のクリップとに挟まれた
間隙部分とを通称「耳」と称する。そして、この耳にお
ける延伸歪みの影響は、フィルム両端部に最も強く現
れ、フィルム中央部へ至るに従って漸衰して弱くなる傾
向にある。このため、フィルム全巾からこの両端の耳部
を約５０〜１００mmｍ切り落としたうえで、フィルム製
品ロールとして巻き取っている。しかしながら、耳での
延伸歪みが著しい場合は、耳部を切り落とした後のフィ
ルムの端部も実用上製品扱いできないので、スリット工
程で更に切り落とす必要がある。このため、フィルム製
品の収率低下とそのリサイクルの負担増を招くといった
二次的弊害もあった。[0007] However, no simultaneous biaxially stretched film has been proposed which has effectively solved or improved this problem. In a biaxially stretched film product, the above-described portion grasped and restrained by a clip and a gap portion sandwiched between a certain clip and an adjacent clip are generally called “ears”. The effect of the stretching strain on the ears appears most strongly at both ends of the film and tends to gradually decrease and become weaker toward the center of the film. For this purpose, the ears at both ends are cut off from the entire width of the film by about 50 to 100 mm and then wound up as a film product roll. However, if the stretching distortion at the ear is remarkable, the end of the film after the ear is cut off cannot be practically handled as a product, so it is necessary to further cut it off in the slitting step. For this reason, there are also secondary harms such as lowering the yield of the film product and increasing the burden of recycling.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、上記問題を
解決し、同時二軸延伸工程で起きるテンタークリップ間
隔固有の厚さムラ周期の存在をなくすことで、優れた品
質安定性・均一性を有する同時二軸延伸ポリアミドフィ
ルムを提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above problems and eliminates the existence of the thickness unevenness period inherent in the tenter clip interval which occurs in the simultaneous biaxial stretching step, thereby achieving excellent quality stability and uniformity. It is an object of the present invention to provide a simultaneous biaxially stretched polyamide film having:
【０００９】[0009]
【課題を解決するための手段】本発明者らは、上記課題
を解決するため、厚さ変動、特に周期性を示す厚さ変動
に着目した。この変動の周期成分を分析・評価した結
果、例えば、印刷ピッチずれなどの加工適性を損なう主
因が、テンタークリップ間隔固有の短周期変動であるこ
とを突き止めた。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have focused on thickness variations, particularly thickness variations exhibiting periodicity. As a result of analyzing and evaluating the periodic component of this variation, it was found that the main factor that impairs the processability, such as a print pitch shift, is the short-period variation inherent to the tenter clip interval.
【００１０】このテンタークリップ間隔固有の厚さムラ
周期の存在をなくすことで、物性変動の少ない加工適性
に優れた二軸延伸ポリアミドフィルムが得られることが
判明した。It has been found that a biaxially stretched polyamide film having little change in physical properties and excellent in workability can be obtained by eliminating the existence of the thickness unevenness period inherent to the tenter clip interval.
【００１１】すなわち、本発明の二軸延伸ポリアミドフ
ィルムは、長手方向の厚さムラ変動波形を高速フーリエ
変換して得られるリニア・スペクトラムによって解析さ
れた同時二軸延伸テンタークリップ間隔周期の振幅成分
が、全周期帯域のオーバーオール値に対し８ｄＢ以下で
あることを特徴とする。That is, in the biaxially stretched polyamide film of the present invention, the amplitude component of the simultaneous biaxially stretched tenter clip interval period analyzed by the linear spectrum obtained by performing the fast Fourier transform of the thickness unevenness fluctuation waveform in the longitudinal direction is obtained. , Is 8 dB or less with respect to the overall value of the entire period band.
【００１２】また、本発明の二軸延伸ポリアミドフィル
ムの製造方法は、同時二軸延伸を行うテンタークリップ
の直径をＤ、最初にフィルムを把持するクリップ間距離
をＰとして、あるクリップの側端と隣り合うクリップの
側端との間の間隙Ｐ−Ｄの機械的縦延伸倍率ＮCIと、縦
延伸倍率ＮMDとの比率ＮCI／ＮMDが、１.３以上２.３以
下となるように延伸を行うことを特徴とする。Further, in the method for producing a biaxially stretched polyamide film of the present invention, the diameter of a tenter clip to be simultaneously biaxially stretched is D, and the distance between clips for initially gripping the film is P; The ratio N CI / N MD between the mechanical longitudinal stretching ratio N CI and the longitudinal stretching ratio N MD of the gap PD between the side ends of the adjacent clips is 1.3 or more and 2.3 or less. The stretching is performed.
【００１３】[0013]
【発明の実施の形態】以下、本発明について詳細に説明
する。本発明では、フィルムの長手方向の厚さムラ変動
波形に高速フーリエ変換すなわちＦＦＴ演算処理を施
し、それによって得られる図１に示すようなリニア・ス
ペクトラムにて解析された、同時二軸延伸テンタークリ
ップ間隔周期の振幅成分が、全周期帯域のオーバーオー
ル値すなわち図示のような波形の積分値に対し、８ｄＢ
以下であることが必要である。更に好ましくは１２ｄＢ
以下である。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. According to the present invention, a simultaneous biaxially stretched tenter clip is obtained by performing a fast Fourier transform, that is, an FFT operation, on a thickness unevenness variation waveform in a longitudinal direction of a film and analyzing the linear spectrum as shown in FIG. The amplitude component of the interval period is 8 dB relative to the overall value of the entire period band, ie, the integral value of the waveform as shown.
It must be: More preferably, 12 dB
It is as follows.
【００１４】リニア・スペクトラム解析の結果におい
て、例えば、溶融樹脂フィルムの冷却成形工程に用いる
冷却ロール周期などは、１ｍ以上の長周期のランダム変
動が主なもので、変化も緩やかである。ところが、同じ
変動振幅でも特に３０ｃｍ未満のテンタークリップ間隔
で繰り返される短周期の振幅成分が８ｄＢ以下とならな
い状態で強く現れると、そのフィルムは、物性変動も激
しく高い加工適性を要求される用途には商品化できな
い。その理由は、フィルム両端部は中央部に比べ強制的
に耳の変形歪みの影響を受けているので、面方向の応力
分布がアンバランスであり、そのため、印刷加工を一例
にとれば、加工処理で走行フィルムに掛かる張力が均一
に作用せず、このフィルムが局部的に著しく伸びて、印
刷ピッチずれなどの問題を引き起こすためである。この
短周期の物性変動は、加工工程で応手できないために最
も厄介である。According to the results of the linear spectrum analysis, for example, the cooling roll cycle used in the cooling and forming step of the molten resin film mainly has a long period of 1 m or more, and the change is gradual. However, even if the amplitude of the short period repeated at the same fluctuation amplitude of less than 30 cm, especially at a tenter clip interval of less than 8 dB, strongly appears in a state where the difference does not become 8 dB or less, the film has a large variation in physical properties and is required for applications requiring high processability. Cannot be commercialized. The reason is that both ends of the film are forcibly affected by the deformation of the ears compared to the center, so the stress distribution in the surface direction is unbalanced, so if printing processing is taken as an example, processing In this case, the tension applied to the running film does not act uniformly, and the film is locally remarkably stretched to cause a problem such as a printing pitch deviation. This short-period variation in physical properties is the most troublesome because it cannot respond in the processing step.
【００１５】本発明では、フィルムの長手方向の厚さム
ラ変動の実効値が、すなわちフィルムの平均厚さを中心
軸にして＋（正）−（負）に変動する厚さムラ波形の実
効値が、ベース厚さの１５％以下であるのが好ましく、
１０％以下であるのが更に好ましい。厚さムラ変動はそ
の殆どがランダム変動であるが、そのランダム変動にテ
ンタークリップ間隔の厚さ変動が合成した場合には、大
きな合成変動となる。ベース厚さの１５％を超えるよう
な大きな変動は、同じくフィルム物性を著しく損なうこ
とになるため、そのフィルムは商品化できない。In the present invention, the effective value of the thickness unevenness fluctuation in the longitudinal direction of the film, that is, the effective value of the thickness unevenness waveform fluctuating to + (positive)-(negative) with the average thickness of the film as a central axis. Is preferably 15% or less of the base thickness,
More preferably, it is 10% or less. Most of the variation in thickness unevenness is a random variation, but when the variation in the thickness of the tenter clip interval is combined with the variation in the random variation, a large combined variation occurs. Large fluctuations, such as over 15% of the base thickness, also impair the physical properties of the film, so that the film cannot be commercialized.
【００１６】更に、本発明では、フィルムの長手方向及
び巾方向の少なくとも一方向につき、１６０℃・５分間
の乾熱収縮率が−０.３％以上２.０％以下であることが
好ましい。より好ましくは、０.１％以上１.２％以下で
ある。乾熱収縮率が上記範囲を外れると、熱寸法安定性
が劣るために別のトラブルを誘発することになり、好ま
しくない。Furthermore, in the present invention, the dry heat shrinkage at 160 ° C. for 5 minutes in at least one of the longitudinal direction and the width direction of the film is preferably from -0.3% to 2.0%. More preferably, it is 0.1% or more and 1.2% or less. If the dry heat shrinkage is out of the above range, thermal dimensional stability is inferior and another trouble is induced, which is not preferable.
【００１７】次に、本発明の製造方法について説明す
る。しかし、本発明の二軸延伸ポリアミドフィルムを製
造するための方法は、以下の製造方法に限定されるもの
ではない。Next, the manufacturing method of the present invention will be described. However, the method for producing the biaxially stretched polyamide film of the present invention is not limited to the following production method.
【００１８】すなわち、図２に示すように同時二軸延伸
を行うテンタークリップ１の直径をＤ、最初にフィルム
を把持するクリップ間距離をＰとし、あるクリップの側
端と、これと隣り合う他のクリップの側端との間の間隙
Ｐ−Ｄの機械的縦延伸倍率をＮCIとして、この機械的縦
延伸倍率をＮCIと縦延伸倍率ＮMDとの比率ＮCI／Ｎ
MDが、１.３以上２.３以下である必要がある。That is, as shown in FIG. 2, the diameter of the tenter clip 1 for performing simultaneous biaxial stretching is D, the distance between the clips for first gripping the film is P, and the side end of a certain clip and another ratio N CI / N clip mechanical longitudinal stretching ratio of gap P-D between the side edges as N CI, the mechanical longitudinal stretching ratio of N CI and the longitudinal stretching ratio N MD
MD must be 1.3 or more and 2.3 or less.
【００１９】このようにして、クリップ１で把持される
フィルム両端の巾約Ｄの縦一軸延伸部分、すなわち
「耳」の部分の実質的に均一な延伸化を図ることで、テ
ンタークリップ間隔周期の振幅成分を８ｄＢ以下に抑え
ることができる。In this way, the longitudinally uniaxially stretched portion having a width of about D at both ends of the film gripped by the clip 1, that is, the “ear” portion is substantially uniformly stretched, so that the tenter clip interval period can be reduced. The amplitude component can be suppressed to 8 dB or less.
【００２０】この耳巾約Ｄの一軸延伸の応力は、あるク
リップ１と隣り合う他のクリップ１とに挟まれたＰ−Ｄ
の間隙の延伸応力で決まる。Ｐ−Ｄの機械的縦延伸倍率
ＮCIと縦延伸倍率ＮMDとの比率ＮCI／ＮMDを上記適正範
囲の高倍率に選択することで、Ｐ−Ｄを高応力域まで引
っ張ることができ、ネック現象による極端な延伸ムラを
防ぐことができる。且つ、これによって、高応力域で
は、更に、クリップ１で把持されている未延伸フィルム
を縦方向に引っ張り出す働きとして作用するので、耳を
実質的に均一に延伸化することが可能となるのである。The uniaxial stretching stress of this ear width D is about P-D sandwiched between a certain clip 1 and another adjacent clip 1.
Is determined by the stretching stress in the gap. By selecting the ratio N CI / N MD of the mechanical longitudinal stretching ratio N CI and the longitudinal stretching ratio N MD of the PD to a high ratio within the above-described appropriate range, the PD can be pulled to a high stress region. In addition, it is possible to prevent extreme stretching unevenness due to a neck phenomenon. In addition, in the high stress region, the unstretched film held by the clip 1 further acts to pull out in the longitudinal direction, so that the ears can be stretched substantially uniformly. is there.
【００２１】更に具体的に説明する。Ｄを小さく・Ｐを
大きくし過ぎると、ＮCI／ＮMDが１.３未満になり、Ｐ
−Ｄの部分の延伸ムラが強調され、又、クリップで把持
されていた部分は殆ど延伸されないために、クリップ間
隔周期の延伸ムラが現れる。逆に、Ｄを大きく・Ｐを小
さくし過ぎると、ＮCI／ＮMDが２.３を超え、Ｐ−Ｄの
部分の破断を起こしたり、クリップ１で把持されていた
未延伸フィルムが引っ張り出され過ぎて掴み外れを起こ
したりする。又、Ｄを必要以上に大きくすることは、耳
巾Ｄにもとづく損失が大きくなり、またクリップ１がフ
ィルム厚さの薄い部分を掴むことになって破断し易くな
るといった、別のトラブルに繋がるので、好ましくな
い。This will be described more specifically. If D is too small and P is too large, N CI / N MD becomes less than 1.3 and P
The stretching unevenness of the portion -D is emphasized, and the portion gripped by the clip is hardly stretched, so that stretching unevenness of the clip interval period appears. Conversely, if D is too large and P is too small, N CI / N MD exceeds 2.3, causing breakage of the P-D portion or unstretched film held by the clip 1 being pulled out. They get too gripped and come off. Further, if D is made larger than necessary, the loss based on the width of the ear D becomes large, and the clip 1 catches a thin portion of the film thickness, which leads to another trouble such that the clip 1 is easily broken. Is not preferred.
【００２２】かかるＰ−Ｄの縦延伸倍率ＮCIは、図２で
示すように ＮCI＝(ＮMD・Ｐ−Ｄ)／(Ｐ−Ｄ) となる。
ここで、Ｄは通常１０〜３０ｍｍ、Ｐはテンターの延伸
機構により異なるが、通常３０〜６０ｍｍが広く採用さ
れている。The longitudinal stretching ratio N CI of the PD is N CI = (N MD · PD) / (PD) as shown in FIG.
Here, D is usually 10 to 30 mm, and P is different depending on the stretching mechanism of the tenter, but usually 30 to 60 mm is widely adopted.
【００２３】本発明では、同時二軸延伸の縦延伸倍率が
２.５倍以上４.５倍以下であり、且つ、縦延伸倍率と横
延伸倍率との比率が０.５以上１.５以下であることが好
ましい。上記範囲は、充分な配向を与えるために実用化
されている二軸延伸倍率であるが、ここでの焦点は、耳
巾Ｄの一軸延伸倍率が２.５倍未満では、応力−歪み曲
線の降伏点と応力差が少ないため延伸ムラになり易く、
また４.５倍を超えると破断が頻発するトラブルとなる
ことにある。更に、耳巾Ｄの未延伸フィルム端部の平均
厚さは、通常、中央部より２〜３倍厚いために、上述の
ような現象が顕著に現れる。In the present invention, the longitudinal stretching ratio in the simultaneous biaxial stretching is from 2.5 times to 4.5 times, and the ratio of the longitudinal stretching ratio to the transverse stretching ratio is from 0.5 to 1.5. It is preferred that The above range is a biaxial stretching ratio that has been put to practical use in order to give a sufficient orientation, but the focus here is that when the uniaxial stretching ratio of the ear width D is less than 2.5 times, the stress-strain curve of Since the yield point and the stress difference are small, it is easy to cause uneven stretching,
On the other hand, when the ratio exceeds 4.5 times, a breakage frequently occurs. Further, since the average thickness of the end portion of the unstretched film having the ear width D is usually two to three times larger than that of the central portion, the above-described phenomenon is remarkably exhibited.
【００２４】加えて、縦横延伸倍率の比率が上記範囲以
外では、耳の延伸歪みが二軸延伸フィルム製品に波及し
易くなる問題が起こる。本発明における同時二軸延伸
は、パンタグラフ方式テンター、スクリュー方式テンタ
ー、リニアモータ方式テンターなどを用いて行うことが
できる。このうち、個々のクリップがリニアモータ方式
で単独に駆動されているテンターは、可変周波数ドライ
バを制御することで延伸倍率を任意に制御できる柔軟性
から、最も好ましい。例えば、一旦縦方向に高倍率延伸
を行ったうえで耳の均一延伸化を行うことで、クリップ
間隔を適正な倍率に戻すなどの調整が容易である。又、
ポリアミド樹脂の種類及びフィルム生産銘柄により、縦
横延伸倍率・軌跡を微妙にしかも自由に選択できる利点
がある。In addition, when the ratio of the longitudinal and transverse stretching ratios is out of the above range, there occurs a problem that the stretching distortion of the ear easily spreads to the biaxially stretched film product. The simultaneous biaxial stretching in the present invention can be performed using a pantograph type tenter, a screw type tenter, a linear motor type tenter, or the like. Among these, a tenter in which each clip is independently driven by a linear motor method is most preferable from the viewpoint of flexibility in controlling a stretching magnification by controlling a variable frequency driver. For example, by performing high-magnification stretching once in the longitudinal direction and then performing uniform stretching of the ears, adjustment such as returning the clip interval to an appropriate magnification is easy. or,
According to the type of polyamide resin and the brand of film production, there is an advantage that the longitudinal / lateral stretching ratio and trajectory can be finely and freely selected.
【００２５】本発明において用いられるポリアミド樹脂
としては、ナイロン６、ナイロン６６の他、ナイロン１
１、ナイロン１２などの単独重合体や、これらの混合
物、共重合体などが挙げられる。The polyamide resin used in the present invention includes nylon 6, nylon 66 and nylon 1
1, homopolymers such as nylon 12, and mixtures and copolymers thereof.
【００２６】ポリアミド樹脂には、公知の添加剤、たと
えば安定剤、酸化防止剤、充填剤、滑剤、帯電防止剤、
ブロッキング防止剤、着色剤などを含有させても良い。The polyamide resin may contain known additives such as stabilizers, antioxidants, fillers, lubricants, antistatic agents,
An anti-blocking agent, a coloring agent and the like may be contained.
【００２７】[0027]
【実施例】以下の実施例において用いた下記の特性値
は、それぞれ次の方法により測定した。 （１）長手方向の厚さムラ変動測定 厚さムラ変動測定は、アンワインダーでフィルム製品ロ
ールを速度１００ｍ／ｍｉｎで巻出し、フィルム端から
巾方向に５０ｍｍの位置におけるフィルム長手方向の厚
さを、横河電機株式会社製β線厚さ計でアナログ測定す
ることにより行った。 （２）厚さムラ変動のＦＦＴ解析・実効値測定 上記厚さムラ変動測定により得られた波形の出力を、日
置電機株式会社製メモリハイコーダに接続し、一旦捕捉
した信号をＦＦＴ（高速フーリエ変換）演算して、リニ
ア・スペクトラムを求めた。更に、厚さムラ変動の実効
値は、平均厚さを中心軸にして＋（正）−（負）に変動
する厚さムラ波形より演算した。 実施例 ナイロン６樹脂を巾６００ｍｍのＴ型ダイより溶融押出
し、冷却ロール上でシート状に冷却固化させて、厚さ１
１０μｍの未延伸ポリアミドフィルムを成形し、続いて
５０℃に温調された温水槽でこのフィルムを吸水処理さ
せた。次に、このフィルムをリニアモータ駆動の同時二
軸延伸テンターに供給し、両端をクリップで把持して、
縦延伸倍率３.０倍、横延伸倍率３.３倍に同時二軸延伸
を行った。更にテンターオーブンで２１５℃の熱処理を
施し、冷却処理後、フィルムの両端部をトリミングして
巻取機で巻取った。これにより、厚さ１０μｍの同時二
軸延伸ポリアミドフィルム製品ロールを得た。巻き取り
速度は、１２０ｍ／ｍｉｎとした。テンタークリップの
直径Ｄは２０ｍｍ、最初にフィルムを把持するクリップ
間距離Ｐは５５ｍｍとした。クリップ間隙Ｐ−Ｄの機械
的縦延伸倍率ＮCIは４.１倍、比率ＮCI／ＮMDは１.３８
であった。EXAMPLES The following characteristic values used in the following examples were measured by the following methods. (1) Measurement of thickness unevenness variation in the longitudinal direction The thickness unevenness variation measurement is performed by unwinding a film product roll with an unwinder at a speed of 100 m / min, and measuring the thickness in the film longitudinal direction at a position 50 mm in the width direction from the film end. The measurement was performed by analog measurement using a β-ray thickness gauge manufactured by Yokogawa Electric Corporation. (2) FFT analysis and effective value measurement of thickness unevenness fluctuation The output of the waveform obtained by the above thickness unevenness fluctuation measurement is connected to a Memory HiCorder manufactured by Hioki Electric Co., Ltd. Conversion) to obtain a linear spectrum. Further, the effective value of the thickness unevenness variation was calculated from a thickness unevenness waveform that fluctuated + (positive)-(negative) with the average thickness as a central axis. Example Nylon 6 resin was melt-extruded from a T-die having a width of 600 mm, and cooled and solidified into a sheet on a cooling roll to form a sheet having a thickness of 1.
A 10 μm unstretched polyamide film was formed, and then the film was subjected to a water absorption treatment in a hot water bath adjusted to 50 ° C. Next, this film is supplied to a simultaneous biaxial stretching tenter driven by a linear motor, and both ends are gripped with clips.
Simultaneous biaxial stretching was performed at a longitudinal stretching ratio of 3.0 times and a transverse stretching ratio of 3.3 times. Further, the film was subjected to a heat treatment at 215 ° C. in a tenter oven, and after cooling, both ends of the film were trimmed and wound up by a winder. Thereby, a 10 μm-thick simultaneously biaxially stretched polyamide film product roll was obtained. The winding speed was 120 m / min. The diameter D of the tenter clip was 20 mm, and the inter-clip distance P for initially gripping the film was 55 mm. The mechanical longitudinal stretching ratio N CI of the clip gap PD is 4.1 times, and the ratio N CI / N MD is 1.38.
Met.
【００２８】次に、得られたフィルムの長手方向の厚さ
ムラ変動を測定して、データをＦＦＴ解析した。その結
果、フィルム両端部から５０ｍｍ間隔でフィルム中央部
まで解析を行った全ての位置において、テンタークリッ
プ間隔周期の振幅成分は１２ｄＢ以下であった。又、そ
の厚さムラ変動の実効値は１０％以下であった。Next, the variation in thickness unevenness in the longitudinal direction of the obtained film was measured, and the data was subjected to FFT analysis. As a result, the amplitude component of the tenter clip interval cycle was 12 dB or less at all positions where the analysis was performed from both ends of the film to the center of the film at intervals of 50 mm. The effective value of the variation in thickness unevenness was 10% or less.
【００２９】又、フィルムの物性測定の結果、１６０℃
・５分間の縦方向及び横方向の乾熱収縮率は、何れも
０.６％であった。 比較例 実施例と同様の条件としたが、テンタークリップの直径
Ｄは１０ｍｍとして、厚さ１０μｍの同時二軸延伸ポリ
アミドフィルム製品ロールを得た。クリップ間隙Ｐ−Ｄ
の機械的縦延伸倍率ＮCIは３.４倍、比率ＮCI／ＮMDは
１.１５であった。As a result of measuring the physical properties of the film,
The dry heat shrinkage in the vertical and horizontal directions for 5 minutes was both 0.6%. Comparative Example The same conditions as in the example were used except that the diameter D of the tenter clip was 10 mm, and a simultaneously biaxially stretched polyamide film product roll having a thickness of 10 μm was obtained. Clip gap PD
Mechanical longitudinal draw ratio N CI of 3.4 times, the ratio N CI / N MD was 1.15.
【００３０】得られたフィルムの長手方向の厚さムラ変
動を測定して、データをＦＦＴ解析した。その結果、フ
ィルム両端部から２００ｍｍの位置までは、テンターク
リップ間隔周期の振幅成分が８ｄＢ以上で不良であっ
た。つまり、この不良部分の左右２００ｍｍをカットし
てフィルム製品とする必要があり、実用可能なフィルム
製品巾が狭巾となり、収率が著しく悪化した。The variation in thickness unevenness in the longitudinal direction of the obtained film was measured, and the data was subjected to FFT analysis. As a result, from the both ends of the film to the position 200 mm away, the amplitude component of the tenter clip interval cycle was 8 dB or more, which was poor. In other words, it was necessary to cut the left and right 200 mm of the defective portion into a film product, and the width of the practicable film product became narrow, and the yield was significantly deteriorated.
【００３１】[0031]
【発明の効果】本発明によれば、フィルムの長手方向厚
さムラ周期を解析し、同時二軸延伸工程で起きるテンタ
ークリップ間隔固有の厚さムラ周期の存在を防止するこ
とで、厚さ均一性・機械的特性・熱寸法安定性の向上が
図れ、優れた加工適性を備えた同時二軸延伸ポリアミド
フィルムを高収率に生産できる。According to the present invention, the thickness unevenness period of the film in the longitudinal direction is analyzed, and the existence of the thickness unevenness period inherent to the tenter clip interval that occurs in the simultaneous biaxial stretching process is prevented, so that the thickness can be made uniform. The properties, mechanical properties, and thermal dimensional stability can be improved, and a simultaneous biaxially stretched polyamide film with excellent workability can be produced in high yield.
【図１】本発明に基づく、フィルムの厚さムラ変動波形
に高速フーリエ変換処理を施して得られるリニア・スペ
クトラムの例を示す図である。FIG. 1 is a diagram showing an example of a linear spectrum obtained by performing a fast Fourier transform process on a film thickness fluctuation waveform according to the present invention.
【図２】本発明に基づくクリップとクリップ間隙の延伸
倍率とを説明するための模式図である。FIG. 2 is a schematic diagram for explaining a clip and a stretch ratio of a clip gap according to the present invention.
Claims (6)
リエ変換して得られるリニア・スペクトラムによって解
析された同時二軸延伸テンタークリップ間隔周期の振幅
成分が、全周期帯域のオーバーオール値に対し８ｄＢ以
下であることを特徴とする同時二軸延伸ポリアミドフィ
ルム。1. An amplitude component of a simultaneous biaxial stretching tenter clip interval period analyzed by a linear spectrum obtained by performing a fast Fourier transform on a thickness unevenness fluctuation waveform in a longitudinal direction is 8 dB with respect to an overall value of an entire period band. A simultaneous biaxially stretched polyamide film characterized by the following.
ス厚さの１５％以下であることを特徴とする請求項１記
載の同時二軸延伸ポリアミドフィルム。2. The simultaneous biaxially stretched polyamide film according to claim 1, wherein the effective value of the thickness unevenness variation in the longitudinal direction is 15% or less of the base thickness.
についての１６０℃・５分間の乾熱収縮率が−０.３％
以上２.０％以下であることを特徴とする請求項１又は
２記載の同時二軸延伸ポリアミドフィルム。3. The dry heat shrinkage at 160 ° C. for 5 minutes in at least one of the longitudinal direction and the width direction is −0.3%.
The simultaneous biaxially stretched polyamide film according to claim 1 or 2, wherein the content is 2.0% or less.
直径をＤ、最初にフィルムを把持するクリップ間距離を
Ｐとして、あるクリップの側端と隣り合うクリップの側
端との間の間隙Ｐ−Ｄの機械的縦延伸倍率ＮCIと、縦延
伸倍率ＮMDとの比率ＮCI／ＮMDが、１.３以上２.３以下
となるように延伸を行うことを特徴とする同時二軸延伸
ポリアミドフィルムの製造方法。4. A gap P- between a side end of a certain clip and a side end of an adjacent clip, where D is the diameter of the tenter clip for simultaneous biaxial stretching, and P is the distance between the clips that grips the film first. Simultaneous biaxial stretching characterized in that stretching is performed so that the ratio N CI / N MD between the mechanical longitudinal stretching ratio N CI and the longitudinal stretching ratio N MD of D is 1.3 or more and 2.3 or less. A method for producing a polyamide film.
上４.５倍以下であり、且つ縦延伸倍率と横延伸倍率と
の比率が０.５以上１.５以下である請求項４記載の同時
二軸延伸ポリアミドフィルムの製造方法。5. The simultaneous biaxial stretching in which the longitudinal stretching ratio is from 2.5 times to 4.5 times, and the ratio between the longitudinal stretching ratio and the transverse stretching ratio is from 0.5 to 1.5. Item 6. The method for producing a simultaneous biaxially stretched polyamide film according to Item 4.
ターにより同時二軸延伸を行うことを特徴とする請求項
４又は５記載の同時二軸延伸ポリアミドフィルムの製造
方法。6. The method for producing a simultaneously biaxially stretched polyamide film according to claim 4, wherein simultaneous biaxial stretching is performed by a tenter driven by a linear motor system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000262004A JP4535583B2 (en) | 2000-08-31 | 2000-08-31 | Method for producing simultaneously biaxially stretched polyamide film |
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| JP4535583B2 JP4535583B2 (en) | 2010-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006026901A (en) * | 2004-07-12 | 2006-02-02 | Toppan Printing Co Ltd | Transparent gas barrier laminate and transparent gas barrier laminated packaging material |
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| JP4535583B2 (en) | 2010-09-01 |
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