JP2000211022A - Preparation of biaxially drawn polyamide film - Google Patents
Preparation of biaxially drawn polyamide filmInfo
- Publication number
- JP2000211022A JP2000211022A JP11012971A JP1297199A JP2000211022A JP 2000211022 A JP2000211022 A JP 2000211022A JP 11012971 A JP11012971 A JP 11012971A JP 1297199 A JP1297199 A JP 1297199A JP 2000211022 A JP2000211022 A JP 2000211022A
- Authority
- JP
- Japan
- Prior art keywords
- film
- extruder
- polyamide film
- sheet
- biaxially stretched
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、優れた透明性、実
用強度、寸法安定性、および長手方向に引き裂いた際の
引裂直進性に優れた二軸延伸ポリアミドフィルムの製造
方法に関するものである。The present invention relates to a method for producing a biaxially stretched polyamide film having excellent transparency, practical strength, dimensional stability, and excellent straightness when it is torn in the longitudinal direction.
【０００２】[0002]
【従来の技術】食品、医薬品、雑貨等の包装には、各種
プラスチックフィルム製の包装袋が大量に使用されてお
り、通常、二軸延伸されたプラスチックフィルムとヒー
トシール可能な無配向フィルムとをラミネートしたもの
が用いられている。2. Description of the Related Art Various plastic film packaging bags are used in large quantities for packaging foods, medicines, miscellaneous goods, and the like. Usually, a biaxially stretched plastic film and a heat-sealing non-oriented film are used. Laminated ones are used.
【０００３】特に、二軸延伸ポリアミドフィルムはガス
バリア性に優れるため、食品などを長期保存する上で好
適な包装材料である。包装袋に要求される特性として
は、強度と、開封するときの易引裂性の一見相反すると
思われる２つの特性を兼備していることが要求される。
従来、包装袋に開封性を与えるためには、ミシン目、テ
ィアテープ、あるいはノッチを付したりするという工夫
がなされている。しかし、このような従来の方法では、
新たに加工工程を追加することが必要であり、また、フ
ィルムの強度が低下するという問題がある。また、一軸
延伸ポリプロピレンフィルムをラミネートする方法があ
るが、引き裂くために大きな力を要したり、あるいは、
包装袋を直線的に引き裂けないというトラブルがしばし
ば発生する。このような場合、開封と同時に内容物が飛
散して内容物が無駄になったり、また、衣服や調度品を
汚したり、あるいは、内容物が熱い場合、火傷の原因に
なったりするというトラブルが生じる。[0003] In particular, a biaxially stretched polyamide film is a suitable packaging material for long-term storage of foods and the like because of its excellent gas barrier properties. As the characteristics required for the packaging bag, it is required that the packaging bag has both the strength and the two characteristics which seem to be incompatible with each other at first glance.
Conventionally, in order to provide the packaging bag with openability, a perforation, a tear tape, or a notch has been devised. However, in such a conventional method,
It is necessary to add a new processing step, and there is a problem that the strength of the film is reduced. Also, there is a method of laminating a uniaxially stretched polypropylene film, but requires a large force to tear, or
A trouble that the packaging bag cannot be torn linearly often occurs. In such a case, the contents may be scattered at the time of opening and the contents may be wasted, or the clothes and furniture may be soiled, or if the contents are hot, a burn may be caused. Occurs.
【０００４】ポリアミド樹脂の改質により、易引裂性を
付与する方法として、Ｎ６／ＭＸＤ６＝85〜40／15〜60
（重量比）からなる混合ポリアミド組成物を溶融押出
し、インフレーション法を用いて、長手方向（ＭＤ）、
巾方向（ＴＤ）共に2.8 倍以上に延伸した易引裂性フィ
ルム、およびこの易引裂性フィルムが複数層の一層とし
て形成されたラミネートフィルムが提案されている（特
開平５−２２０８３７号公報、特開平５−２００９５８
号公報）。As a method of imparting easy tearing property by modifying a polyamide resin, N6 / MXD6 = 85-40 / 15-60
(Weight ratio) by melt extrusion of the mixed polyamide composition, and the longitudinal direction (MD),
An easily tearable film stretched 2.8 times or more in both width directions (TD) and a laminated film in which the easily tearable film is formed as a single layer have been proposed (JP-A-5-220837, JP-A-5-220837). 5-200958
No.).
【０００５】また、Ｎ６／ＭＸＤ６＝80〜95／20〜5
（重量比）の混合物からなり、ＭＸＤ６の分散粒子の形
状を特定の形状に分散させた引裂直進性を有する二軸延
伸ポリアミドフィルムが提案されている（特開平７−１
１３０１５号公報）。Also, N6 / MXD6 = 80-95 / 20-5
(Weight ratio), and a biaxially stretched polyamide film having tear straightness in which the shape of MXD6 dispersed particles is dispersed in a specific shape has been proposed (Japanese Patent Application Laid-Open No. 7-1).
No. 13015).
【０００６】しかしながら、上記のような従来のフィル
ムにおいては、製膜安定性に問題があったり、フィルム
の厚み斑が大きくなり商品価値が低下したり、あるいは
引裂直進性が不充分な場合があった。However, in the conventional film as described above, there are cases where there is a problem in film formation stability, the thickness unevenness of the film is large, the commercial value is reduced, or the tear straightness is insufficient. Was.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、上記の問題
を解決しようとするものであり、ポリアミドフィルムの
強靱性と優れた透明性と厚み均一性を有し、かつ、フィ
ルムの長手方向に引き裂いた際の直進性に優れた二軸延
伸ポリアミドフィルムを安定して生産することができる
方法を提供しようとするものである。SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and has the toughness and excellent transparency and thickness uniformity of a polyamide film, and has a property to be reduced in the longitudinal direction of the film. An object of the present invention is to provide a method capable of stably producing a biaxially stretched polyamide film having excellent straightness upon tearing.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、Ｔダイよ
り押し出された溶融シートを冷却ロールに密着させて得
られる未延伸シートの製造条件を改善することにより上
記の課題が解決されることを見出し本発明に到達した。
すなわち、本発明の要旨は次のとおりである。ナイロン
６（Ｎ６）／ポリメタキシリレンアジパミド（ＭＸＤ
６）＝８０／２０〜９５／５（重量比）からなる組成物
を原料として用い、押出機内で加熱溶融し、Ｔダイより
押し出されたシートを冷却ロールに密着させて得られた
未延伸シートを、縦および横方向に延伸して二軸延伸ポ
リアミドフィルムを製造する方法において、（１）式に
定義されるＣＤＲを７〜１０の範囲となる条件で未延伸
シートを製造することを特徴とする二軸延伸ポリアミド
フィルムの製造方法。 ＣＤＲ＝（Ｔダイのリップ間隔）／（未延伸シートの厚み） （１）Means for Solving the Problems The present inventors have solved the above-mentioned problems by improving the manufacturing conditions of an unstretched sheet obtained by bringing a molten sheet extruded from a T-die into close contact with a cooling roll. The inventors have found that the present invention has been achieved.
That is, the gist of the present invention is as follows. Nylon 6 (N6) / Polymetaxylylene adipamide (MXD
6) An unstretched sheet obtained by using a composition consisting of = 80/20 to 95/5 (weight ratio) as a raw material, heating and melting in an extruder, and bringing a sheet extruded from a T-die into close contact with a cooling roll. Is stretched in the longitudinal and transverse directions to produce a biaxially stretched polyamide film, characterized in that an unstretched sheet is produced under the condition that the CDR defined by the formula (1) is in the range of 7 to 10. Of producing a biaxially stretched polyamide film. CDR = (T die lip interval) / (Unstretched sheet thickness) (1)
【０００９】[0009]
【発明の実施の形態】本発明において用いられるポリア
ミドは、Ｎ６とＭＸＤ６の混合物であるが、本発明の効
果を損なわない範囲で、他のポリアミドや、ポリアミド
樹脂に通常用いられる各種の無機および有機系の添加剤
を配合してもよい。無機系の添加剤としては、タルク、
シリカ、アルミナ、マグネシア、炭酸カルシウムなどの
滑剤や、ハロゲン化銅などの酸化防止剤が挙げられる。
また、有機系の添加剤としては、ε−カプラミド二量
体、グラファイトなどの結晶核剤、芳香族アミン、ヒン
ダードフェノールなどの酸化防止剤、変性ポリオレフィ
ンなどのフィルム改質剤が例示される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The polyamide used in the present invention is a mixture of N6 and MXD6. However, as long as the effects of the present invention are not impaired, other polyamides and various inorganic and organic compounds usually used in polyamide resins are used. A system additive may be blended. As inorganic additives, talc,
Lubricants such as silica, alumina, magnesia, and calcium carbonate; and antioxidants such as copper halides.
Examples of the organic additive include a nucleating agent such as ε-capramide dimer and graphite, an antioxidant such as aromatic amine and hindered phenol, and a film modifier such as modified polyolefin.
【００１０】また、Ｎ６の相対粘度は２．５〜４．０、
好ましくは２．９〜３．３である。相対粘度が２．５未
満の場合にはＭＸＤ６の分散粒子径が大きくなり、フィ
ルムの引裂直進性が低下し、また、相対粘度が４．０よ
り大きいとフィルムの押出製膜性が低下する場合があ
る。Further, the relative viscosity of N6 is 2.5 to 4.0,
Preferably it is 2.9-3.3. When the relative viscosity is less than 2.5, the dispersed particle size of MXD6 becomes large, and the tear straightness of the film decreases, and when the relative viscosity is more than 4.0, the extrudability of the film decreases. There is.
【００１１】本発明におけるＭＸＤ６としては、本発明
の効果を損ねない範囲であれば、パラキシリレンアジパ
ミド成分を５重量％以下程度含有したものでもよい。The MXD6 in the present invention may contain about 5% by weight or less of a paraxylylene adipamide component as long as the effects of the present invention are not impaired.
【００１２】また、ＭＸＤ６の相対粘度は２．０〜３．
０、好ましくは２．３〜２．５である。相対粘度が２．
０未満の場合、Ｎ６中でのＭＸＤ６の分散粒子の生成が
阻害され、得られるフィルムの引裂直進性が低下する。
また、相対粘度が３．０より大きいとＭＸＤ６の分散粒
子径が大きくなり、引裂直進性が低下する。The relative viscosity of MXD6 is 2.0-3.
0, preferably 2.3 to 2.5. 1. The relative viscosity is 2.
If it is less than 0, generation of dispersed particles of MXD6 in N6 will be inhibited, and the resulting film will have poor tear straightness.
On the other hand, if the relative viscosity is larger than 3.0, the dispersed particle size of MXD6 increases, and the tear straightness decreases.
【００１３】本発明におけるＮ６とＭＸＤ６の混合比
は、Ｎ６／ＭＸＤ６＝８０／２０〜９５／５（重量比）
である。ＭＸＤ６が２０重量％より多い場合、フィルム
の厚み変動などの操業性の問題が発生しやすく、また、
ＭＸＤ６が５重量％より少ない場合は引裂直進性が得ら
れない。The mixing ratio of N6 and MXD6 in the present invention is N6 / MXD6 = 80/20 to 95/5 (weight ratio).
It is. If MXD6 is more than 20% by weight, operability problems such as film thickness variation are likely to occur, and
When MXD6 is less than 5% by weight, tear straightness cannot be obtained.
【００１４】本発明においては、原料樹脂を押出機内で
加熱溶融してＴダイのスリットからシート状に押し出し
た後、冷却ロールに密着させて得られた未延伸シートを
縦および横方向に延伸して二軸延伸ポリアミドフィルム
が製造されるが、このとき、下記式（１）で示されるＣ
ＤＲ（キャストドロー比）を７〜１０とすることが必要
である。 ＣＤＲ＝（Ｔダイのリップ間隔）／（未延伸シートの厚み） （１） ＣＤＲが７未満の場合には、延伸フィルムの引裂直進性
が低下し、また、ＣＤＲが１０より大きくなると、延伸
工程においてフィルムの切断が発生した時に、元の製造
条件への復帰が遅くなる、いわゆる、つながりが悪くな
るという現象が生じて、切断屑が延伸機内のリターン側
のリンクに巻き込まれて、著しい生産性の悪化を招くと
いう問題が発生する。In the present invention, the raw resin is heated and melted in an extruder, extruded into a sheet shape from a slit of a T-die, and then unstretched sheet obtained by closely adhering to a cooling roll is stretched in longitudinal and transverse directions. To produce a biaxially stretched polyamide film. At this time, a C film represented by the following formula (1)
It is necessary to set DR (cast draw ratio) to 7 to 10. CDR = (T-die lip interval) / (thickness of unstretched sheet) (1) When the CDR is less than 7, the tearing straightness of the stretched film is reduced, and when the CDR is larger than 10, the stretching process is performed. When film cutting occurs, the return to the original manufacturing conditions is delayed, so-called, the phenomenon of poor connection occurs, and cutting waste is caught in the return side link in the drawing machine, resulting in significant productivity This causes a problem of deterioration of the image quality.
【００１５】また、本発明においては、押出機内の溶融
樹脂のスクリュー計量部における最大せん断速度を２０
〜５０ｓ-1、好ましくは３０〜４５ｓ-1とし、押出機内
の樹脂の滞留時間を１〜５分、好ましくは１〜３分と
し、溶融樹脂の最高温度を２６０〜２８０℃とすること
が好ましい。最大せん断速度が２０ｓ-1より小さい場合
には混練が不充分となり、フィルムの各種の性能が低下
する。また、５０ｓ-1より大きい場合には混練効果が高
すぎてフィルムの引裂直進性が低下するので好ましくな
い。押出機内の溶融樹脂の滞留時間が１分より短い場合
は混練が不充分となり、フィルムの各種の性能が低下
し、５分より長いと混練が強すぎてフィルムの引裂直進
性が低下するため好ましくない。溶融樹脂の最高温度が
２８０℃より高い場合には、Ｎ６とＭＸＤ６の反応が進
行してフィルムの引裂直進性が低下したり、フィルムの
厚みが不均一となりやすく、一方、２６０℃より低い場
合には、押出圧力の上昇や製膜安定性が低下するため好
ましくない。In the present invention, the maximum shear rate of the molten resin in the extruder in the screw measuring section is set to 20.
～50S -1, preferably with 30~45s -1, 1~5 minutes residence time in the extruder of resin, preferably between minutes 1-3, it is preferable to set the maximum temperature of the molten resin and 260 to 280 ° C. . When the maximum shear rate is less than 20 s -1 , kneading becomes insufficient, and various performances of the film are reduced. On the other hand, if it is larger than 50 s −1 , the kneading effect is too high and the tear straightness of the film is undesirably reduced. When the residence time of the molten resin in the extruder is shorter than 1 minute, kneading becomes insufficient, and various performances of the film are reduced. When the residence time is longer than 5 minutes, kneading is too strong, and the tear straightness of the film is preferably reduced. Absent. If the maximum temperature of the molten resin is higher than 280 ° C., the reaction between N6 and MXD6 proceeds to reduce the straightness of tearing of the film, and the film thickness tends to be non-uniform. Is not preferred because the extrusion pressure increases and the film forming stability decreases.
【００１６】スクリュー計量部とは、スクリュー供給
部、スクリュー圧縮部に続くスクリューの前方部分で、
溶融した樹脂の均一混練性を付与する部分であり、ま
た、スクリュー計量部の最大せん断速度とは、押出機内
のスクリュー計量部で溶融樹脂に与えられる最大のせん
断速度のことである。また、樹脂の滞留時間とは、押出
機内に原料が供給されてから、押出機のシリンダーから
押し出されるまでの時間である。The screw measuring section is a front part of the screw following the screw supply section and the screw compression section.
This is a portion for imparting uniform kneading properties of the molten resin, and the maximum shear rate of the screw measuring section is the maximum shear rate given to the molten resin in the screw measuring section in the extruder. The residence time of the resin is the time from when the raw material is supplied into the extruder to when it is extruded from the cylinder of the extruder.
【００１７】本発明において用いられる押出機内のスク
リューとしては、フルフライトタイプ、ダムフライトタ
イプなどの一般的なものを用いることができるが、前記
スクリューにユニメルトやマードックなどの混練部を付
加したものを用いた場合には、Ｎ６とＭＸＤ６の反応が
進み、得られるフィルムの引裂直進性が低下する場合が
あるので好ましくない。As the screw in the extruder used in the present invention, a general screw such as a full flight type or a dam flight type can be used, and a screw obtained by adding a kneading unit such as Unimelt or Murdoch to the screw is used. When it is used, the reaction between N6 and MXD6 progresses, and the straightness of tearing of the obtained film may decrease, which is not preferable.
【００１８】本発明におけるフィルムの製造方法として
は、Ｎ６とＭＸＤ６の混合物を押出機に供給し、本発明
において規定される各条件で加熱溶融した後、Ｔダイか
らシート状に押し出し、回転するキャストロール上で急
冷する。In the method for producing a film according to the present invention, a mixture of N6 and MXD6 is supplied to an extruder, heated and melted under the conditions specified in the present invention, extruded from a T-die into a sheet, and rotated by a cast. Quench on roll.
【００１９】次に、得られた未延伸シートを二軸延伸す
るが、二軸延伸の方法としては、テンター式同時二軸延
伸法、ロール・テンター式逐次二軸延伸法などが用いら
れる。たとえば、テンター式同時二軸延伸法を用いる場
合には、まず未延伸シートの水分率を１〜６％に調整し
た後、同時二軸延伸機に送り込み、延伸温度１６０〜１
９０℃で、縦および横方向の延伸倍率をそれぞれ２．８
〜３．８倍程度として同時二軸延伸する。Next, the obtained unstretched sheet is biaxially stretched. Examples of the biaxial stretching method include a tenter-type simultaneous biaxial stretching method and a roll / tenter-type sequential biaxial stretching method. For example, when using the tenter-type simultaneous biaxial stretching method, the moisture content of the unstretched sheet is first adjusted to 1 to 6%, and then the sheet is fed to a simultaneous biaxial stretching machine and stretched at a temperature of 160 to 1%.
At 90 ° C., the draw ratio in the longitudinal and transverse directions was 2.8 each.
Simultaneous biaxial stretching is performed at about 3.8 times.
【００２０】次に、二軸延伸されたフィルムを、温度１
９０〜２２０℃で３〜１０秒間熱処理し、巾方向に１〜
１０％の弛緩処理を行って二軸延伸を固定する。Next, the biaxially stretched film is heated at a temperature of 1
Heat-treated at 90-220 ° C for 3-10 seconds,
The biaxial stretching is fixed by performing a 10% relaxation treatment.
【００２１】延伸フィルムの厚みは、包装材料として求
められる強度を備えておればよく、特に限定されない
が、通常１０〜２５μm 程度である。The thickness of the stretched film is not particularly limited as long as it has the strength required as a packaging material, and is usually about 10 to 25 μm.
【００２２】また、本発明の方法により得られた二軸延
伸ポリアミドフィルムは、他のフィルムや紙、布、金属
などとラミネートしたり、アルミナ、シリカなどを蒸着
して用いることもできる。The biaxially stretched polyamide film obtained by the method of the present invention can be used by laminating it with another film, paper, cloth, metal or the like, or by vapor deposition of alumina, silica or the like.
【００２３】[0023]
【実施例】次に、実施例により本発明を具体的に説明す
る。なお、フィルムの各性能の評価方法は次の通りであ
る。Next, the present invention will be described in detail with reference to examples. In addition, the evaluation method of each performance of a film is as follows.
【００２４】（１）ポリアミドの相対粘度〔η〕；９６
％硫酸１００ｍｌ中に試料１ｇを溶解し、キャノンフェ
ンスケ型粘度計を用い、２５℃の条件下で測定した。 （２）スクリュー計量部におけるせん断速度γ（ｓ-1） 押出機シリンダーの内径Ｄ（ｃｍ）、スクリュー回転数
n（ｒｐｓ）、計量部の溝深さＨ（ｃｍ）の各値を用い
て、次式より求めた。 γ＝π・Ｄ・ｎ／Ｈ （３）押出機内における樹脂の滞留時間（ｓｅｃ） 押出機のシリンダー内に原料が供給されてから、押出機
から押し出されるまでにかかった時間を測定した。 （４）押出機内における樹脂の最高温度（℃） 押出機シリンダー内のスクリューの供給部、圧縮部、計
量部の各部に相当する位置に、スクリューの回転および
樹脂の流動に影響を及ぼさないように、温度センサーを
設置して測定した。 （５）引張強度（ｋｇｆ／ｍｍ2 ） 幅１０ｍｍ、試料長１００ｍｍの試料を用いて、ＡＳＴ
Ｍ Ｄ８８２に準じて測定した。 （６）フィルムの厚み変動（％） 放射線式フィルム厚み測定器をフィルムの幅方向に走査
することにより、延伸フィルムの厚みをライン走行中に
リアルオンタイムで測定した。１００ｍの走行あたり、
測定器をフィルム幅方向に５往復させ、厚みの平均値Ｄ
ａ 、最大値Ｄｍａｘおよび最小値Ｄｍｉｎから、次式
により厚み変動率Ｐ（％）を計算した。 Ｐ＝〔（Ｄｍａｘ−Ｄｍｉｎ）／Ｄａ 〕×１００ Ｐが７％未満のものを○、７％以上のものを×とした。 （７）フィルム長手方向の引裂直進性 延伸フィルムのＴＤ方向に所定間隔（Ｗｓ：２０ｍｍ）
で切れ目を入れ、これらの切れ目に沿ってフィルムをＭ
Ｄ方向に２００ｍｍ引き裂いた時、切れ目を入れていな
い他端のズレ幅Ｗｅ（ｍｍ）を測定し、次式により引裂
き時のズレ率α（％）を計算した。 α＝（Ｗｅ／Ｗｓ）×１００ この測定を１０回繰り返し、αの平均値が１０％未満の
ものを◎（引裂直進性が非常に良好）、１０％≦α≦３
０％のものを○（引裂直進性が良好）、αが３０％を超
えるものを×（引裂直進性が不良）とした。 （８）切断復旧性 延伸機の入口で、未延伸シートの中央に直径１ｍｍの穴
を開けて強制的に延伸切断を発生させて、その後のつな
がり具合を観察した。１０秒以内につながった場合を
◎、１０秒を超え２０秒以内につながった場合を○、２
０秒を超えた場合および延伸機への供給不能となった場
合を×とした。(1) Relative viscosity of polyamide [η]; 96
1 g of a sample was dissolved in 100 ml of 100% sulfuric acid and measured at 25 ° C. using a Cannon-Fenske viscometer. (2) Shear speed γ (s -1 ) in screw measuring section Inner diameter D (cm) of extruder cylinder, screw rotation speed
Using the values of n (rps) and the groove depth H (cm) of the measuring section, the value was obtained from the following equation. γ = π · D · n / H (3) Residence time of resin in extruder (sec) The time required from the supply of the raw material into the cylinder of the extruder to the extruding from the extruder was measured. (4) Maximum temperature of the resin in the extruder (° C) At the positions corresponding to the screw supply section, compression section, and metering section in the extruder cylinder, so as not to affect the rotation of the screw and the flow of the resin. And a temperature sensor was installed. (5) Tensile strength (kgf / mm 2 ) AST was measured using a sample having a width of 10 mm and a sample length of 100 mm.
It was measured according to MD882. (6) Film Thickness Fluctuation (%) The thickness of the stretched film was measured in real-time while the line was running by scanning a film thickness measuring device in the width direction of the film. Per 100m run,
The measuring instrument is reciprocated 5 times in the film width direction, and the average value D of the thickness is obtained.
From a, the maximum value Dmax and the minimum value Dmin, the thickness variation rate P (%) was calculated by the following equation. P = [(Dmax−Dmin) / Da] × 100 P was less than 7%, and X was 7% or more. (7) Tearing straightness in the longitudinal direction of the film A predetermined interval (Ws: 20 mm) in the TD direction of the stretched film
And cut the film along these cuts with M
When the film was torn in the direction D by 200 mm, the misalignment width We (mm) of the other end having no cut was measured, and the misalignment rate α (%) at the time of tearing was calculated by the following equation. α = (We / Ws) × 100 This measurement was repeated 10 times, and those having an average value of α of less than 10% were evaluated as excellent (very good tear straightness), 10% ≦ α ≦ 3
A sample with 0% was rated as ○ (good tear straightness), and a sample with α exceeding 30% was rated as poor (bad tear straightness). (8) Recoverability of cutting A hole having a diameter of 1 mm was made in the center of the unstretched sheet at the entrance of the stretching machine to forcibly perform stretching and cutting, and the subsequent connection was observed. ◎ when connected within 10 seconds ◎ when connected more than 10 seconds and within 20 seconds ○ 2
The case where the time exceeded 0 second and the case where supply to the stretching machine became impossible were evaluated as x.
【００２５】実施例１ Ｎ６（ユニチカ社製、商品名：Ａ１０３０ＢＲＦ、相対
粘度３．１０）およびＭＸＤ６（三菱瓦斯化学社製、商
品名：ＭＸナイロンＳ６９０７、相対粘度２．４０）を
８０：２０（重量比）で混合したポリアミド組成物を、
２００ｍｍφダムフライトタイプのスクリューを備えた
押出機を使用して、スクリュー計量部における最大せん
断速度４０ｓ-1、押出機内における樹脂の滞留時間を２
分、シリンダー内における樹脂の最高温度２７０℃の条
件で、ＣＤＲ＝８．０としてＴダイよりシート状に押し
出した。押し出した未延伸シートを、表面温度１５℃に
温調された回転するキャストロールに密着急冷し、厚み
約１５０μｍの未延伸シートを得た。得られた未延伸シ
ートを６０℃の温水中で１分間処理した後、テンター式
同時二軸延伸機のクリップに把持し、延伸温度１８５
℃、延伸倍率を縦および横方向に３．０×３．３倍の条
件で延伸した後、２０５℃で４秒間の熱処理を施して、
厚み約１５μｍの二軸延伸フィルムを得た。熱処理の
際、巾方向に５％の弛緩処理を施した。得られた二軸延
伸フィルムの引張強度、厚み均一性、長手方向の引裂直
進性および切断復旧性を測定した結果を表１に示した。Example 1 N6 (manufactured by Unitika, trade name: A1030BRF, relative viscosity 3.10) and MXD6 (manufactured by Mitsubishi Gas Chemical Company, trade name: MX nylon S6907, relative viscosity 2.40) were mixed with 80:20 ( Weight ratio).
Using an extruder equipped with a 200 mmφ dam flight type screw, the maximum shear rate in the screw metering section was 40 s −1 and the residence time of the resin in the extruder was 2
Then, the resin was extruded in a sheet form from a T-die under the condition of the maximum temperature of the resin in the cylinder of 270 ° C. with CDR = 8.0. The extruded unstretched sheet was closely and rapidly cooled to a rotating cast roll whose surface temperature was controlled at 15 ° C. to obtain an unstretched sheet having a thickness of about 150 μm. After the obtained unstretched sheet was treated in warm water at 60 ° C. for 1 minute, it was gripped by clips of a tenter-type simultaneous biaxial stretching machine, and stretched at a temperature of 185.
After stretching under the conditions of 3.0 ° C. and a stretching ratio of 3.0 × 3.3 in the longitudinal and transverse directions, a heat treatment was performed at 205 ° C. for 4 seconds,
A biaxially stretched film having a thickness of about 15 μm was obtained. During the heat treatment, a 5% relaxation treatment was performed in the width direction. Table 1 shows the results of measuring the tensile strength, the thickness uniformity, the tear straightness in the longitudinal direction, and the cut recovery of the obtained biaxially stretched film.
【００２６】実施例２〜３ Ｎ６、ＭＸＤ６の配合比を表１に示す条件に変更した以
外は、実施例１と同様の方法により二軸延伸フィルムを
得た。得られた二軸延伸フィルムの各物性の評価結果を
表１に示した。Examples 2 to 3 A biaxially stretched film was obtained in the same manner as in Example 1 except that the mixing ratio of N6 and MXD6 was changed to the conditions shown in Table 1. Table 1 shows the evaluation results of the properties of the obtained biaxially stretched film.
【００２７】実施例４ ＣＤＲを１０とした以外は、実施例３と同様の方法によ
り二軸延伸フィルムを得た。得られた二軸延伸フィルム
の各物性の評価結果を表１に示した。Example 4 A biaxially stretched film was obtained in the same manner as in Example 3 except that the CDR was changed to 10. Table 1 shows the evaluation results of the properties of the obtained biaxially stretched film.
【００２８】実施例５〜７ スクリュー計量部における最大せん断速度、押出機内に
おける樹脂の滞留時間、および樹脂の最高温度を表１に
示す条件に変更した以外は、実施例１と同様の方法によ
り二軸延伸フィルムを得た。得られた二軸延伸フィルム
の各物性の評価結果を表１に示した。Examples 5 to 7 The same procedures as in Example 1 were carried out except that the maximum shear rate in the screw metering section, the residence time of the resin in the extruder, and the maximum temperature of the resin were changed to the conditions shown in Table 1. An axially stretched film was obtained. Table 1 shows the evaluation results of the properties of the obtained biaxially stretched film.
【００２９】比較例１〜２ Ｎ６、ＭＸＤ６の配合比を表１に示す条件に変更した以
外は、実施例１と同様の方法により二軸延伸フィルムを
得た。得られた二軸延伸フィルムの各物性の評価結果を
表１に示した。Comparative Examples 1-2 A biaxially stretched film was obtained in the same manner as in Example 1 except that the mixing ratio of N6 and MXD6 was changed to the conditions shown in Table 1. Table 1 shows the evaluation results of the properties of the obtained biaxially stretched film.
【００３０】比較例３〜４ ＣＤＲを表１に示す条件に変更した以外は、実施例３と
同様の方法により二軸延伸フィルムを得た。得られた二
軸延伸フィルムの各物性の評価結果を表１に示した。Comparative Examples 3 and 4 Biaxially stretched films were obtained in the same manner as in Example 3 except that the CDRs were changed to the conditions shown in Table 1. Table 1 shows the evaluation results of the properties of the obtained biaxially stretched film.
【００３１】[0031]
【表１】 [Table 1]
【００３２】[0032]
【発明の効果】本発明の方法を用いることにより、優れ
た強度とフィルムの長手方向の引裂直進性に優れた二軸
延伸ポリアミドフィルムを製造する方法が提供され、ま
た、延伸工程において発生したフィルムの切断を短時間
に復旧することができるので、その経済的価値は極めて
大きい。According to the present invention, there is provided a method for producing a biaxially stretched polyamide film having excellent strength and excellent tear straightness in the longitudinal direction of the film, and a film produced in the stretching step. Its economic value is extremely large because it can be restored in a short time.
Claims (2)
ンアジパミド（ＭＸＤ６）＝８０／２０〜９５／５（重
量比）からなる組成物を原料として用い、押出機内で加
熱溶融し、Ｔダイより押し出されたシートを冷却ロール
に密着させて得られた未延伸シートを、縦および横方向
に延伸して二軸延伸ポリアミドフィルムを製造する方法
において、（１）式に定義されるＣＤＲを７〜１０の範
囲となる条件で未延伸シートを製造することを特徴とす
る二軸延伸ポリアミドフィルムの製造方法。 ＣＤＲ＝（Ｔダイのリップ間隔）／（未延伸シートの厚み） （１）1. A composition comprising nylon 6 (N6) / polymethaxylylene adipamide (MXD6) = 80/20 to 95/5 (weight ratio), which is heated and melted in an extruder to obtain a T-die. In a method for producing a biaxially oriented polyamide film by stretching an unstretched sheet obtained by bringing a sheet extruded from the sheet into close contact with a cooling roll in the longitudinal and transverse directions, the CDR defined by the formula (1) is reduced to 7 A method for producing a biaxially stretched polyamide film, wherein an unstretched sheet is produced under conditions that fall within a range of from 10 to 10. CDR = (T die lip interval) / (Unstretched sheet thickness) (1)
における最大せん断速度を２０〜５０ｓ-1、押出機内の
樹脂の滞留時間を１〜５分、溶融樹脂の最高温度を２６
０〜２８０℃とする請求項１記載の二軸延伸ポリアミド
フィルムの製造方法。2. The maximum shear rate of the molten resin in the screw metering section in the extruder is 20 to 50 s -1 , the residence time of the resin in the extruder is 1 to 5 minutes, and the maximum temperature of the molten resin is 26.
The method for producing a biaxially stretched polyamide film according to claim 1, wherein the temperature is 0 to 280 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11012971A JP2000211022A (en) | 1999-01-21 | 1999-01-21 | Preparation of biaxially drawn polyamide film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11012971A JP2000211022A (en) | 1999-01-21 | 1999-01-21 | Preparation of biaxially drawn polyamide film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000211022A true JP2000211022A (en) | 2000-08-02 |
Family
ID=11820125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11012971A Pending JP2000211022A (en) | 1999-01-21 | 1999-01-21 | Preparation of biaxially drawn polyamide film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000211022A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009128261A1 (en) * | 2008-04-16 | 2009-10-22 | ユニチカ株式会社 | Biaxially stretched polyamide resin film, and process for production thereof |
| JP2021115862A (en) * | 2020-01-27 | 2021-08-10 | 東レ株式会社 | Reclamation method of film and regenerated film |
-
1999
- 1999-01-21 JP JP11012971A patent/JP2000211022A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009128261A1 (en) * | 2008-04-16 | 2009-10-22 | ユニチカ株式会社 | Biaxially stretched polyamide resin film, and process for production thereof |
| US8293160B2 (en) | 2008-04-16 | 2012-10-23 | Unitika Ltd. | Biaxially stretched polyamide resin film, and process for production thereof |
| JP5501223B2 (en) * | 2008-04-16 | 2014-05-21 | ユニチカ株式会社 | Biaxially stretched polyamide resin film and method for producing the same |
| JP2021115862A (en) * | 2020-01-27 | 2021-08-10 | 東レ株式会社 | Reclamation method of film and regenerated film |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3456667B2 (en) | Sodium benzoate as a nucleating agent for uniaxially oriented polypropylene films | |
| EP0826478B1 (en) | Process for producing polyester composition | |
| EP1754588B1 (en) | Polyamide resin film roll | |
| JP3940184B2 (en) | Production method of polypropylene film | |
| US4111860A (en) | Process for the productions of multi-cellular stretched articles | |
| MXPA01012379A (en) | High tensile strength polyethylene terephthalate film and process. | |
| EP0482518B1 (en) | Process for production of polypropylene sheets or films | |
| WO2006112090A1 (en) | Film roll of polyamide-based blend resin and process for producing the same | |
| JPH10230540A (en) | Production of biaxially stretched polyamide film | |
| EP0317276B1 (en) | Polypropylene films | |
| JP2000211022A (en) | Preparation of biaxially drawn polyamide film | |
| JP2571612B2 (en) | Film production method | |
| JPH0257316A (en) | Method and device for manufacturing poly-epsilon-capron amide film | |
| JPH09157410A (en) | Biaxially oriented polyamide film and its production | |
| JPH10296852A (en) | Manufacture of biaxially oriented polyamide film | |
| JP2000514373A (en) | Manufacturing method of biaxially oriented polypropylene film | |
| JP4289323B2 (en) | Manufacturing method of polyamide resin film roll | |
| JPH0411373B2 (en) | ||
| JP4150957B2 (en) | Polyester film and method for producing the same | |
| JP2535061B2 (en) | Film production method | |
| JPS6020410B2 (en) | Polybutene resin composition | |
| JPH02127022A (en) | Film for twist wrapping | |
| KR20030096407A (en) | Toughened biaxially oriented film | |
| JP3796010B2 (en) | Ethylene vinyl acetate copolymer saponified resin sheet and method for producing stretched film thereof | |
| JP2001341198A (en) | Biaxially stretched polyamide film and method for manufacturing the same |