JPH09193242A - Method of manufacturing polyamide film - Google Patents
Method of manufacturing polyamide filmInfo
- Publication number
- JPH09193242A JPH09193242A JP894696A JP894696A JPH09193242A JP H09193242 A JPH09193242 A JP H09193242A JP 894696 A JP894696 A JP 894696A JP 894696 A JP894696 A JP 894696A JP H09193242 A JPH09193242 A JP H09193242A
- Authority
- JP
- Japan
- Prior art keywords
- film
- coating
- tenter
- stretched
- coated
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、インラインコーテ
ィング法によって、表面コート逐次２軸延伸ポリアミド
フイルムを製造する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a surface-coated sequentially biaxially stretched polyamide film by an in-line coating method.
【０００２】[0002]
【従来の技術】２軸延伸ポリアミドフイルムは、機械的
特性、光学的特性、熱的特性、ガスバリヤー性をはじめ
として、耐摩耗性、耐衝撃性、耐ピンホール性などに優
れていることから、食品その他の包装材料用フイルムと
して広く利用されている。2. Description of the Related Art Biaxially stretched polyamide film has excellent mechanical properties, optical properties, thermal properties, gas barrier properties, abrasion resistance, impact resistance and pinhole resistance. Widely used as a film for foods and other packaging materials.
【０００３】近年、包装材料用フイルムの高性能化が強
く要望されるようになり、例えば、ハイガスバリヤー
性、易接着性、帯電防止性などの特性のレベルアップが
求められている。このような性能のレベルアップの要求
に対応する方法として、種々の高分子溶液あるいは分散
液をコーティングする方法がある。In recent years, there has been a strong demand for higher performance of films for packaging materials, and for example, it is required to improve the characteristics such as high gas barrier property, easy adhesion property and antistatic property. As a method for responding to the demand for higher performance, there is a method of coating various polymer solutions or dispersions.
【０００４】表面コートフイルムの製造法としては、フ
イルム製品の巻取工程以降に後処理としてコーティング
を行うポストコート法とフイルムの巻取工程以前の未延
伸フイルム又は延伸工程においてコーティングを行うイ
ンラインコート法がある。As the method for producing the surface-coated film, there are a post-coating method in which coating is performed as a post-treatment after the winding step of the film product, and an in-line coating method in which coating is performed in the unstretched film before the winding step of the film or in the stretching step. There is.
【０００５】インラインコート法は、経済的観点から注
目されており、有用な技術である。例えば、特公昭41−
8370号公報には、熱可塑性樹脂フイルムを縦方向に２倍
以上延伸したフイルムに熱可塑性高分子物質の溶液ある
いは分散液をコーティングし、直ちにテンター式延伸機
に供給し、フイルム延伸の予熱ゾーンにおいて40℃以上
で乾燥し、引き続いて横方向に２倍以上の延伸を行う方
法が開示されている。しかし、この方法によれば、横延
伸前のコート皮膜乾燥後のフイルム幅方向の温度の均一
性が不十分であり、横延伸時に延伸斑がしばしば発生す
るという問題がある。The in-line coating method has attracted attention from an economical point of view and is a useful technique. For example, Japanese Patent Publication 41-
No. 8370 discloses that a film obtained by stretching a thermoplastic resin film at least twice in the machine direction is coated with a solution or dispersion of a thermoplastic polymer substance, and immediately supplied to a tenter type stretching machine, in a preheating zone for film stretching. A method of drying at 40 ° C. or higher and subsequently stretching in the transverse direction by 2 times or more is disclosed. However, according to this method, there is a problem that the uniformity of the temperature in the film width direction after drying the coat film before transverse stretching is insufficient, and stretching unevenness often occurs during transverse stretching.
【０００６】また、特公平３− 67495号公報には、結晶
性を有する熱可塑性樹脂を溶融押出しし、得られた未延
伸フイルムを縦方向に延伸した後、少なくともその片面
に端部を残して塗液をコーティングし、乾燥した後、横
方向に延伸し、表面コート逐次２軸延伸フイルムを得る
方法において、コーティング後の縦延伸フイルムをその
結晶開始温度より少なくとも30℃低い温度で、かつ、熱
収縮率が２％を超えない温度で実質的に乾燥した後、テ
ンターで横方向に延伸することによって優れた連続生産
性を得る方法が開示されている。しかしながら、ポリア
ミドのように結晶化開始温度が低く、配向結晶化が速い
樹脂では、塗液をコーティングした後の乾燥工程で配向
結晶化が進行して操業性が悪いという問題がある。な
お、配向結晶化の進行を抑制するために、乾燥温度を低
くすると乾燥に長時間を要し、実際上、連続生産は不可
能となる。In Japanese Patent Publication No. 3-67495, a thermoplastic resin having crystallinity is melt-extruded and the obtained unstretched film is stretched in the longitudinal direction, and at least one end of the unstretched film is left. In the method for obtaining a surface-coated sequential biaxially stretched film by coating with a coating solution, drying and then stretching in the transverse direction, the longitudinally stretched film after coating is heated at a temperature of at least 30 ° C. lower than the crystallization initiation temperature, and heated. A method of obtaining excellent continuous productivity by substantially stretching at a temperature at which the shrinkage ratio does not exceed 2% and then stretching in the transverse direction with a tenter is disclosed. However, a resin having a low crystallization initiation temperature and a rapid orientation crystallization, such as polyamide, has a problem that orientation crystallization proceeds in a drying step after coating with a coating liquid, resulting in poor operability. If the drying temperature is lowered in order to suppress the progress of oriented crystallization, it takes a long time to dry, and continuous production is practically impossible.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、優れたフイ
ルム物性を有する表面コート逐次２軸延伸ポリアミドフ
イルムを操業性よく、しかも経済的に製造することので
きる方法を提供しようとするものである。DISCLOSURE OF THE INVENTION The present invention is intended to provide a method capable of producing a surface-coated successively biaxially stretched polyamide film having excellent film properties with good operability and economically. .
【０００８】[0008]
【課題を解決するための手段】本発明は、上記の課題を
解決するもので、その要旨は、実質的に無定形で配向し
ていない未延伸ポリアミドフイルムを縦方向に延伸した
後、テンターで横方向に延伸する方法において、テンタ
ー直前でフイルムの片面にクリップで把持するための端
部を残して塗液をコーティングし、テンター内の予熱部
でフイルムを乾燥した後、テンターで横延伸して、表面
コート延伸ポリアミドフイルムを製造するに際し、横延
伸直前のコート部のフイルム温度を45〜65℃とするとと
もに、コート部と非コート部との温度差を10℃以内とす
ることを特徴とする延伸ポリアミドフイルムの製造方法
にある。Means for Solving the Problems The present invention is to solve the above-mentioned problems, and the gist thereof is to stretch a substantially amorphous and unoriented unstretched polyamide film in the longitudinal direction and then use a tenter. In the method of stretching in the transverse direction, the coating liquid is coated on one side of the film just before the tenter, leaving an end for gripping with a clip, and the film is dried in a preheating part in the tenter, and then transversely stretched in the tenter. In producing the surface-coated stretched polyamide film, the film temperature of the coated portion immediately before transverse stretching is set to 45 to 65 ° C, and the temperature difference between the coated portion and the non-coated portion is set to 10 ° C or less. It is a method for producing a stretched polyamide film.
【０００９】[0009]
【発明の実施の形態】以下、本発明について詳細に説明
する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
【００１０】本発明においてポリアミドとは、配向結晶
性を有する熱可塑性ポリアミドを意味し、具体例として
は、ナイロン６（ポリカプラミド）、ナイロン６６（ポ
リヘキサメチレンアジパミド）、ナイロン６10（ポリヘ
キサメチレンセバカミド）、ナイロン11（ポリウンデカ
ナミド）、ナイロン12（ポリラウラミド）及びこれらの
共重合物や混合物が挙げられるが含まれ、コストパフォ
ーマンスに優れるナイロン６が特に好ましく用いられ
る。In the present invention, polyamide means a thermoplastic polyamide having oriented crystallinity, and specific examples thereof include nylon 6 (polycapramide), nylon 66 (polyhexamethylene adipamide), nylon 610 (polyhexamethylene). Sebacamide), nylon 11 (polyundecanamid), nylon 12 (polylauramide) and copolymers and mixtures thereof are included, and nylon 6 having excellent cost performance is particularly preferably used.
【００１１】これらのポリアミドには必要に応じてフイ
ルムの性能に悪影響を与えない範囲で、滑剤、帯電防止
剤、ブロッキング防止剤、無機微粒子等各種添加剤を添
加することができる。If necessary, various additives such as a lubricant, an antistatic agent, an antiblocking agent, and inorganic fine particles may be added to these polyamides as long as the performance of the film is not adversely affected.
【００１２】本発明に用いる塗液は特に限定されるもの
ではなく、接着性、ガスバリヤー性、ヒートシール性、
表面滑性、帯電防止性等を改善するための高分子溶液又
は高分子分散液であり、例えば、ポリエステル系樹脂、
ポリアミド系樹脂、ポリ塩化ビニリデン系樹脂、ポリオ
レフイン系樹脂、アイオノマー系樹脂、ポリビニルアル
コール系樹脂、ポリアクリル酸系樹脂、ポリアルキレン
グリコール樹脂等の熱可塑性樹脂、アミノアルキド系樹
脂、アミノアクリル酸系樹脂、メラミン系樹脂、尿素系
樹脂、エポキシ系樹脂、ポリウレタン系樹脂、シリコー
ン系樹脂等の熱硬化性及びこれら樹脂の混合物が挙げら
れる。塗液には乳化剤、ブロッキング防止剤、帯電防止
剤、レベリング剤、粘度調整剤等の各種添加物を目的に
応じて適宜添加することができる。The coating liquid used in the present invention is not particularly limited, and the adhesive property, gas barrier property, heat seal property,
Surface lubricity, a polymer solution or polymer dispersion for improving antistatic properties, such as polyester resin,
Polyamide resin, polyvinylidene chloride resin, polyolefin resin, ionomer resin, polyvinyl alcohol resin, polyacrylic acid resin, thermoplastic resin such as polyalkylene glycol resin, aminoalkyd resin, aminoacrylic acid resin, Examples thereof include thermosetting resins such as melamine resins, urea resins, epoxy resins, polyurethane resins, and silicone resins, and mixtures of these resins. Various additives such as an emulsifier, an antiblocking agent, an antistatic agent, a leveling agent, and a viscosity modifier can be appropriately added to the coating liquid depending on the purpose.
【００１３】本発明において実質的に無定形で配向して
いない未延伸ポリアミドフイルムを得るには、例えば、
ポリアミドを押出機で加熱溶融してＴダイからフイルム
状に押出し、これをエアーナイフキャスト法、静電印加
キャスト法等公知のキャスティング法で回転する冷却ド
ラム上で冷却固化して急冷製膜することによって得るこ
とができる。この未延伸フイルムが配向していると、後
工程での延伸性が低下する。In order to obtain a substantially amorphous and unoriented polyamide film of the present invention, for example,
Polyamide is heated and melted by an extruder and extruded into a film form from a T-die, which is then cooled and solidified on a rotating cooling drum by a known casting method such as an air knife casting method or an electrostatic application casting method to rapidly form a film. Can be obtained by If this unstretched film is oriented, the stretchability in the subsequent steps will be reduced.
【００１４】次に、未延伸フイルムは周速の異なる加熱
ローラ群からなるローラ式縦延伸機で未延伸フイルムの
ガラス転移点以上の温度で 2.7〜3.5 倍に延伸する。本
発明では、縦延伸に引き続いて、フイルムの片面に端部
を残して塗液をコーティングした後、直ちにテンターへ
導入してテンター内の予熱部において塗液の乾燥及び延
伸のための予熱を行い横延伸を施す。この際、横延伸直
前におけるフイルムのコート部の温度を45〜65℃とする
ことが必要である。その理由は、コート部のフイルム温
度が上記範囲より低い場合は、延伸のための予熱が不十
分となり、延伸部における初期延伸応力が高いためにク
リップのつかみ外れを生じ易く、操業性が著しく悪化す
る。特に水性塗液の場合、乾燥が不十分で高分子粒子が
未だ密着しないまま延伸されることとなり、たとえ延伸
可能であったとしても、得られるコートフイルムにおけ
る塗膜と基材フイルムとの接着が悪いものしか得られず
好ましくない。一方、この温度が上記範囲より高い場合
はフイルムの結晶化が著しく進行するため横延伸性が低
下し好ましくない。上記温度範囲においては、ナイロン
６のように結晶化の速い樹脂に対しても良好な延伸性が
得られる。Next, the unstretched film is stretched 2.7 to 3.5 times at a temperature equal to or higher than the glass transition point of the unstretched film by a roller type longitudinal stretching machine composed of a group of heating rollers having different peripheral speeds. In the present invention, following the longitudinal stretching, after coating the coating liquid leaving an end on one side of the film, immediately introduced into the tenter to perform preheating for drying and stretching of the coating liquid in the preheating portion in the tenter. Transverse stretching is performed. At this time, it is necessary to set the temperature of the coated portion of the film to 45 to 65 ° C. immediately before transverse stretching. The reason is that when the film temperature of the coat portion is lower than the above range, preheating for stretching becomes insufficient, and the initial stretching stress in the stretching portion is high, so that the clip easily comes off the grip and the operability is significantly deteriorated. To do. In particular, in the case of an aqueous coating liquid, the polymer particles will be stretched without being dried sufficiently and not yet adhered, and even if stretchable, the adhesion between the coating film and the substrate film in the obtained coat film will be It is not preferable because only bad things can be obtained. On the other hand, when the temperature is higher than the above range, the crystallization of the film remarkably progresses and the transverse stretchability is deteriorated, which is not preferable. In the above temperature range, good stretchability can be obtained even for a resin such as nylon 6 which has a fast crystallization.
【００１５】さらに、本発明においてはコート部と非コ
ート部のフイルム温度差を10℃以内にすることが必要て
ある。コート部は乾燥中に溶媒の蒸発潜熱によって熱を
奪われるためフイルム温度が上がりにくい状態となって
いる。このため非コート部との温度差が助長され易く幅
方向で温度斑が生じるため横延伸性に影響を及ぼす。す
なわち、この温度以上に高い場合はフイルム端部におけ
るネック延伸が発生しやすくなってコート部の実質倍率
が低下し、延伸フイルムに所望の性能を付与するために
は過度に横延伸倍率を上げる必要性が生じるため、切断
頻度が増加し操業性の悪化に繋がる。前記フイルム温度
と同様、幅方向のフイルム温度差をできるだけ小さくす
ることで、特にナイロン６に対する良好な延伸性が達成
される。Further, in the present invention, it is necessary that the film temperature difference between the coated portion and the non-coated portion is within 10 ° C. The film temperature is hard to rise because the coat part is deprived of heat by the latent heat of evaporation of the solvent during drying. Therefore, the temperature difference from the non-coated portion is easily promoted, and temperature unevenness occurs in the width direction, which affects the lateral stretchability. That is, when the temperature is higher than this temperature, neck stretching at the edge of the film is likely to occur, and the substantial magnification of the coat portion decreases, and it is necessary to excessively increase the transverse stretching ratio in order to impart desired performance to the stretched film. Therefore, the cutting frequency increases, leading to deterioration of operability. Similar to the film temperature, by making the film temperature difference in the width direction as small as possible, particularly good stretchability for nylon 6 is achieved.
【００１６】以上のように、コートされた縦延伸フイル
ムの温度が上記最適条件になるように制御したときの
み、塗液の乾燥、塗膜と基材フイルムとの密着性及び横
延伸のための予熱が十分達成されるため、延伸性、操業
性が向上するとともに、得られる表面コートされたポリ
アミドフイルムの塗膜密着性が良好となる。As described above, only when the temperature of the coated longitudinally stretched film is controlled so as to satisfy the above-mentioned optimum conditions, the coating solution is dried, the adhesion between the coating film and the base film, and the lateral stretching. Since sufficient preheating is achieved, the drawability and operability are improved, and the coating film adhesion of the obtained surface-coated polyamide film is good.
【００１７】本発明においてコーティングの方法は特に
限定されるものではなく、例えばグラビアロール法、リ
バースロール法、エアーナイフ法、リバースグラビア
法、マイヤーバー法、インバースロール法及びこれらの
組み合わせによる各種コーティング方式を採用すること
ができ、塗液の特性と目標とする塗工厚みにより適宜選
択できる。ただし、後の工程で行われる乾燥の効率化を
計るためできるだけ均一に塗工できるものが好ましい。In the present invention, the coating method is not particularly limited, for example, a gravure roll method, a reverse roll method, an air knife method, a reverse gravure method, a Meyer bar method, an inverse roll method and various coating methods by a combination thereof. Can be adopted and can be appropriately selected depending on the characteristics of the coating liquid and the target coating thickness. However, it is preferable that the coating can be applied as uniformly as possible in order to improve the efficiency of the drying performed in the subsequent step.
【００１８】本発明においては、コーティングはテンタ
ークリップで把持される部分以外に行う。全面に行った
場合乾燥されていない状態でテンター内に導入されるた
めテンタークリップを汚し、クリップのつかみ外れなど
種々トラブルを引き起こしたりして好ましくない。In the present invention, the coating is applied to the portion other than the portion held by the tenter clip. If it is applied to the entire surface, it is introduced into the tenter in a non-dried state, so that the tenter clip is soiled and various troubles such as gripping of the clip are caused, which is not preferable.
【００１９】コーティング後の予熱部における乾燥は、
できるだけ乾燥効率の優れた方式で行うことがが望まし
い。例えば、上下に熱風吹き出しノズルが配置されたも
ので、かつ前記の温度条件を達成することのできる幅方
向の特定位置でその熱風量が調節可能な構造の装置を用
いて行うことが好ましい。これによりコート部と非コー
ト部の温度差を極小化でき、延伸性を向上させることが
可能となる。The drying in the preheating section after coating is
It is desirable to perform the method with the best drying efficiency. For example, it is preferable to use a device in which hot air blowing nozzles are arranged above and below and the hot air amount can be adjusted at a specific position in the width direction that can achieve the temperature condition. As a result, the temperature difference between the coated portion and the non-coated portion can be minimized, and the stretchability can be improved.
【００２０】[0020]
【実施例】次に、実施例により本発明を具体的に説明す
る。本発明における特性値の測定法は次の通りである。 (1) フイルムの表面温度 堀場製作所社製放射温度計で、横延伸直前におけるフイ
ルム温度を測定した。なお、測定位置はコート部及び非
コート部とし、10点計測して平均した。 (2) 延伸性 横延伸時における破断の頻度を次の規準で評価した。 ○：横延伸時に破断がほとんど生じない。 △：横延伸時にたまに破断する。 ×：横延伸時に破断が頻発する。 (3) 塗膜密着性 延伸後のコートフイルムのコート面にセロハンテープ
（ニチバン社製）を貼着し、急激に剥離して、塗膜の剥
離程度により、次の規準で評価した。 ○：塗膜が全く剥がれない。 △：塗膜が部分的に剥がれる。 ×：塗膜がほとんど剥がれる。EXAMPLES Next, the present invention will be described in detail with reference to examples. The measuring method of the characteristic value in the present invention is as follows. (1) Surface temperature of film The film temperature was measured immediately before transverse stretching with a radiation thermometer manufactured by Horiba Ltd. The measurement positions were the coated part and the non-coated part, and 10 points were measured and averaged. (2) Stretchability The frequency of breakage during transverse stretching was evaluated according to the following criteria. ◯: Fracture hardly occurs during transverse stretching. Δ: Occasionally broken during transverse stretching. X: Breakage frequently occurs during transverse stretching. (3) Adhesion of coating film Cellophane tape (manufactured by Nichiban Co., Ltd.) was adhered to the coated surface of the coated film after stretching, and was rapidly peeled off. The degree of peeling of the coating film was evaluated according to the following criteria. ◯: The coating film does not peel off at all. Δ: The coating film is partially peeled off. X: The coating film is almost peeled off.
【００２１】実施例１ 融点 220℃のナイロン６を 260℃でＴダイよりシート状
に溶融押出した後、エアーナイフキャスト法により25℃
の回転ドラムに密着させて急冷し、厚さ 130μm の実質
的に無定形で配向していない未延伸ポリアミドフイルム
を得た。次いで、この未延伸フイルムを周速の異なる加
熱ローラ群からなる縦延伸機により55〜62℃の温度で2.
75倍に縦延伸して縦延伸ポリアミドフイルムを得た。こ
の縦延伸フイルムに端部30mmを除いて水溶性ポリウレタ
ンとメラミンホルムアルデヒド系硬化剤とからなる固形
分濃度６重量％の水性塗液をマイヤーバーコータを用い
て3.6ｇ／m2・wet となる量でコーティングした。次い
で、コートされた縦延伸フイルムをテンターに導入し、
予熱部で横延伸直前のコート部のフイルム温度を４５
℃、非コート部のフイルム温度を５０℃として実質的に
塗液を乾燥させ、90〜100℃で 3.4倍に横延伸し、 150
〜210 ℃で熱処理し、厚さ15μm の表面コートされた２
軸延伸ポリアミドフイルムを得た。Example 1 Nylon 6 having a melting point of 220 ° C. was melt extruded at 260 ° C. into a sheet form from a T-die and then 25 ° C. by an air knife casting method.
The film was brought into close contact with the rotating drum of No. 1 and rapidly cooled to obtain a 130 μm-thick, substantially amorphous, unoriented polyamide film. Then, this unstretched film was stretched at a temperature of 55 to 62 ° C. by a longitudinal stretching machine consisting of heating roller groups having different peripheral speeds.
The film was longitudinally stretched 75 times to obtain a longitudinally stretched polyamide film. An amount of an aqueous coating solution containing water-soluble polyurethane and a melamine formaldehyde-based curing agent having a solid content concentration of 6% by weight except the end portion of 30 mm is 3.6 g / m 2 · wet using a Mayer bar coater except for 30 mm of the longitudinally stretched film. Coated with. Then, the coated longitudinally stretched film is introduced into a tenter,
In the preheating section, the film temperature of the coating section immediately before transverse stretching is set to 45
℃, the film temperature of the non-coated portion is 50 ℃, the coating liquid is substantially dried, and transversely stretched by a factor of 3.4 at 90 to 100 ℃,
Heat-treated at ~ 210 ℃, 15μm thick surface coated 2
An axially stretched polyamide film was obtained.
【００２２】実施例２〜３ 横延伸直前のコート部のフイルム温度及び非コート部の
フイルム温度を表１のように変えた以外は、実施例１と
同様の方法で厚さ15μm の表面コートされた２軸延伸ポ
リアミドフイルムを得た。Examples 2 to 3 A surface coating having a thickness of 15 μm was formed in the same manner as in Example 1 except that the film temperature of the coated portion and the film temperature of the non-coated portion immediately before transverse stretching were changed as shown in Table 1. A biaxially stretched polyamide film was obtained.
【００２３】実施例４ ポリ塩化ビニリデン共重合体の45重量％濃度のラテック
スをエアーナイフコート法により15ｇ／m2・wet となる
量でコーティングした以外は実施例２と同様の方法で厚
さ16.3μm の表面コートされた２軸延伸ポリアミドフイ
ルムを得た。Example 4 A thickness of 16.3 was obtained in the same manner as in Example 2 except that a latex having a concentration of 45% by weight of a polyvinylidene chloride copolymer was coated in an amount of 15 g / m 2 · wet by an air knife coating method. A μm surface-coated biaxially oriented polyamide film was obtained.
【００２４】比較例１〜３ 横延伸直前のコート部のフイルム温度及び非コート部の
フイルム温度を表１のように変えた以外は、実施例１と
同様の方法で厚さ15μm の表面コートされた２軸延伸ポ
リアミドフイルムを得た。Comparative Examples 1 to 3 A surface coating having a thickness of 15 μm was formed in the same manner as in Example 1 except that the film temperature of the coated portion and the film temperature of the non-coated portion immediately before transverse stretching were changed as shown in Table 1. A biaxially stretched polyamide film was obtained.
【００２５】上記の実施例及び比較例における延伸性及
び塗膜密着性を評価した結果を表１に示す。Table 1 shows the results of evaluation of stretchability and coating film adhesion in the above Examples and Comparative Examples.
【００２６】[0026]
【表１】 [Table 1]
【００２７】本発明の実施例では、延伸性が良好で、塗
膜の密着性の良好な表面コート２軸延伸フイルムが得ら
れた。これに対して、比較例１では、フイルム延伸のた
め不足し、しばしばクリップのつかみ外れや切断が生じ
た。また、得られたフイルムは、塗液の乾燥不足から塗
膜と基材フイルムとの密着性に劣るものであった。比較
例２では、塗膜の密着性には問題なかったが、コート部
と非コート部の温度差が大きいため端部にネックが発生
した。比較例３では、予熱部における塗液の乾燥は十分
であったが、縦延伸フイルムの結晶化が著しく進行し、
横延伸時に破断が生じた。In the examples of the present invention, surface-coated biaxially stretched films having good stretchability and good coating film adhesion were obtained. On the other hand, in Comparative Example 1, the film was insufficient due to the film stretching, and the clip often came off and cut. Further, the obtained film had poor adhesion between the coating film and the base film due to insufficient drying of the coating liquid. In Comparative Example 2, there was no problem in the adhesion of the coating film, but a neck was generated at the end because the temperature difference between the coated portion and the non-coated portion was large. In Comparative Example 3, the coating liquid was sufficiently dried in the preheated portion, but the crystallization of the longitudinally stretched film remarkably progressed,
Breakage occurred during transverse stretching.
【００２８】[0028]
【発明の効果】本発明によれば、テンター内の予熱部に
おいて、塗液の乾燥、塗膜と基材フイルムとの密着化及
びフイルム延伸のための予熱を幅方向に対して均一に行
うことができるため、得られるフイルムの物性、横延伸
性、操業性を向上させることができる。また、本発明の
方法では、コーティング後、特別な乾燥工程が不要であ
り経済効果も大きい。EFFECTS OF THE INVENTION According to the present invention, in the preheating portion in the tenter, the preheating for drying the coating liquid, adhering the coating film to the base film and stretching the film is performed uniformly in the width direction. Therefore, it is possible to improve the physical properties, lateral stretchability and operability of the obtained film. In addition, the method of the present invention does not require a special drying step after coating and has a large economic effect.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 9:00 Ｃ０８Ｌ 77:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area B29L 9:00 C08L 77:00
Claims (1)
ポリアミドフイルムを縦方向に延伸した後、テンターで
横方向に延伸する方法において、テンター直前でフイル
ムの片面にクリップで把持するための端部を残して塗液
をコーティングし、テンター内の予熱部でフイルムを乾
燥した後、テンターで横延伸して、表面コート延伸ポリ
アミドフイルムを製造するに際し、横延伸直前のコート
部のフイルム温度を45〜65℃とするとともに、コート部
と非コート部との温度差を10℃以内とすることを特徴と
する延伸ポリアミドフイルムの製造方法。1. A method for stretching an unstretched polyamide film, which is substantially amorphous and not oriented, in a longitudinal direction and then in a transverse direction with a tenter, for gripping with a clip on one side of the film immediately before the tenter. After coating the coating solution leaving the ends, and drying the film in the preheated part in the tenter, it is laterally stretched in a tenter, when producing a surface-coated stretched polyamide film, the film temperature of the coat part immediately before lateral stretching A method for producing a stretched polyamide film, wherein the temperature difference between the coated part and the non-coated part is within 45 ° C to 65 ° C and within 10 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP894696A JP3670742B2 (en) | 1996-01-23 | 1996-01-23 | Method for producing polyamide film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP894696A JP3670742B2 (en) | 1996-01-23 | 1996-01-23 | Method for producing polyamide film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09193242A true JPH09193242A (en) | 1997-07-29 |
| JP3670742B2 JP3670742B2 (en) | 2005-07-13 |
Family
ID=11706846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP894696A Expired - Lifetime JP3670742B2 (en) | 1996-01-23 | 1996-01-23 | Method for producing polyamide film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3670742B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022080790A (en) * | 2020-11-18 | 2022-05-30 | 日東電工株式会社 | Film manufacturing system and film manufacturing method |
-
1996
- 1996-01-23 JP JP894696A patent/JP3670742B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022080790A (en) * | 2020-11-18 | 2022-05-30 | 日東電工株式会社 | Film manufacturing system and film manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3670742B2 (en) | 2005-07-13 |
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