JP3369381B2 - Method for producing polyamide film - Google Patents
Method for producing polyamide filmInfo
- Publication number
- JP3369381B2 JP3369381B2 JP32147095A JP32147095A JP3369381B2 JP 3369381 B2 JP3369381 B2 JP 3369381B2 JP 32147095 A JP32147095 A JP 32147095A JP 32147095 A JP32147095 A JP 32147095A JP 3369381 B2 JP3369381 B2 JP 3369381B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- air
- film
- thickness
- molten
- 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.)
- Expired - Fee Related
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【発明の属する技術分野】本発明は,均一な厚みを有す
るポリアミドフィルムを高速で安定して生産する方法に
関するものであり,特に,溶融したポリアミド樹脂をダ
イから押し出した後のシートの冷却固化工程に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stably producing a polyamide film having a uniform thickness at a high speed, and particularly to a step of cooling and solidifying a sheet after extruding a molten polyamide resin from a die. Regarding
【0002】[0002]
【従来の技術】Tダイ法によるポリアミド樹脂の未延伸
シートは,ダイより押し出された溶融シートを,回転す
るキャスティングロールと称される冷却ロール(以下、
CRという)の表面に押し付けることによって冷却固化
され,製膜される。2. Description of the Related Art An unstretched sheet of polyamide resin produced by the T-die method is a molten roll extruded from a die.
It is cooled and solidified by pressing it against the surface of (CR) to form a film.
【0003】溶融シートのCRへの押し付け方法として
は,溶融シートの巾方向にエアーナイフ装置により,均
一にエアーを吹き付ける方法(以下、エアーナイフ法と
いう),あるいは,溶融シートに高電圧電極により電荷
を析出させ静電気的に密着させる静電密着法などが採用
されている。As a method for pressing the molten sheet against the CR, a method of uniformly blowing air in the width direction of the molten sheet with an air knife device (hereinafter referred to as an air knife method) or a method of charging the molten sheet with a high voltage electrode The electrostatic contact method, which deposits and electrostatically adheres, is used.
【0004】エアーナイフ法では,溶融シートとCRと
の密着拘束力が弱いため,ポリエステル樹脂のように凝
固体積収縮が大きく,収縮力の強い樹脂は,シートがC
Rから離脱してしまうため,この方法を適用することは
困難であるが,ポリアミド樹脂では,この方法を用いる
ことが可能である。In the air knife method, since the binding restraining force between the molten sheet and the CR is weak, the solidification volume contraction is large like polyester resin, and the resin having strong contracting force is C
It is difficult to apply this method because it leaves R, but this method can be used for polyamide resins.
【0005】エアーナイフ法では,溶融シートとCRの
接点において,CRの回転に伴う随伴空気流圧力とメル
トテンションの分力が働き,溶融シートに浮上力がかか
る。この浮上力に抗してCR表面へエアーナイフで空気
を吹き付け,エアー圧をかけるが,溶融シートとCRの
隙間には,僅かな空気が巻き込まれる結果,薄い空気層
が形成される。しかし,溶融シートとCR表面は完全に
非接触ではなく,部分的にランダムに点接触している。In the air knife method, at the contact point between the molten sheet and the CR, the component force of the accompanying air flow pressure and the melt tension due to the rotation of the CR acts, and the floating force is applied to the molten sheet. Air is blown against the CR surface with an air knife to apply air pressure against the levitation force, but a small amount of air is entrained in the gap between the molten sheet and the CR, so that a thin air layer is formed. However, the molten sheet and the CR surface are not completely in non-contact with each other, but are partially in point contact with each other randomly.
【0006】溶融シートの冷却速度は,この空気層の厚
みによって変化するため,結晶性の高いポリアミド樹脂
においては,その結晶化度が左右され,また,この空気
層の厚み斑によって,得られるシートに部分的な結晶化
斑が生じるという問題がある。シートの結晶化度の大き
さは,後の工程の吸水処理の作業性や延伸工程の延伸性
に影響し,また,部分的な結晶化斑は延伸されたフィル
ムの厚みの均一性,表面平滑度,収縮特性などの物性に
も影響する重要なファクターである。Since the cooling rate of the molten sheet changes depending on the thickness of the air layer, the crystallinity of the polyamide resin having a high crystallinity is affected, and the thickness variation of the air layer results in the obtained sheet. There is a problem that partial crystallization spots occur in the. The size of the crystallinity of the sheet affects the workability of the water absorption treatment in the subsequent process and the stretchability of the stretching process, and the partial crystallization unevenness has a uniform thickness of the stretched film and a smooth surface. It is an important factor that also affects the physical properties such as elasticity and shrinkage characteristics.
【0007】また,エアーナイフ法においては,シート
の製膜スピードが比較的低速度の場合には,溶融シート
は均一に冷却されるが,高速度の場合は,溶融シートと
CR表面との間に均一に空気層が形成されず,空気がま
ばらに閉じこめられる結果,シートに結晶化斑が発生し
やすい。Further, in the air knife method, when the film forming speed of the sheet is relatively low, the molten sheet is cooled uniformly, but when the film forming speed of the sheet is high, between the molten sheet and the CR surface, A uniform air layer is not formed on the sheet, and the air is sparsely trapped. As a result, uneven crystallization tends to occur on the sheet.
【0008】次に,静電密着法をポリアミド樹脂に適用
する場合には,溶融ポリアミド樹脂の電気伝導度が高い
ため,電荷がTダイやCRに漏電し易いという問題があ
る。高速度製膜においては,溶融シートをCRへ適度に
密着させるためのクーロン力に寄与する残留電荷を得る
ためには,大電流放電が必要となるが,電極には放電能
力の限界があるため,静電密着法では製膜速度面での制
約は避けられない。Next, when the electrostatic adhesion method is applied to the polyamide resin, there is a problem that the electric charge of the molten polyamide resin is likely to leak to the T-die or the CR because the electric conductivity of the molten polyamide resin is high. In high-speed film formation, a large current discharge is required to obtain the residual charge that contributes to the Coulomb force for adequately adhering the molten sheet to the CR, but the electrode has a limited discharge capacity. However, the electrostatic adhesion method cannot avoid the restrictions on the film forming speed.
【0009】また,静電密着法によってポリアミド樹脂
シートを製膜した場合,延伸工程で切断が多発するとい
う問題がある。この理由は明確ではないが,局部放電に
よるシートへのダメージの発生や,空気層が介在せずに
溶融シートがCRに密着急冷されるため,得られるシー
トの結晶化が低く,吸水処理や延伸挙動が不安定になる
ためと考えられる。このように,従来,延伸ポリアミド
フィルムを,工業的に安定して高速度で生産する満足で
きる方法はなかった。Further, when the polyamide resin sheet is formed by the electrostatic adhesion method, there is a problem that the cutting occurs frequently in the stretching process. Although the reason for this is not clear, damage to the sheet due to local discharge occurs and the molten sheet is rapidly cooled in close contact with the CR without the presence of an air layer, resulting in low crystallization of the obtained sheet, water absorption treatment and stretching. This is probably because the behavior becomes unstable. As described above, conventionally, there has been no satisfactory method for producing a stretched polyamide film industrially stably at a high speed.
【0010】[0010]
【発明が解決しようとする課題】本発明は,均一かつ適
度な結晶化度を有する未延伸シートを延伸することによ
って,均一な厚みを有する延伸ポリアミドフィルムを,
工業的に高速度で生産する方法を提供しようとするもの
である。SUMMARY OF THE INVENTION The present invention provides a stretched polyamide film having a uniform thickness by stretching an unstretched sheet having a uniform and appropriate crystallinity,
It aims to provide a method for industrially producing at high speed.
【0011】[0011]
【課題を解決するための手段】本発明者らは,これらの
課題を解決するために鋭意検討した結果,エアーナイフ
法により,表面を粗面化処理したCRを用いて製膜する
ことにより,均一かつ適度な結晶化度を有するシートを
高速で安定して製膜することが可能となり,均一な厚み
を有する延伸ポリアミドフィルムを高速で生産できるこ
とを見いだし本発明に到達した。Means for Solving the Problems As a result of intensive studies for solving these problems, the present inventors have found that a film is formed by using a CR whose surface is roughened by an air knife method. The inventors have found that a sheet having a uniform and appropriate crystallinity can be stably formed at a high speed, and a stretched polyamide film having a uniform thickness can be produced at a high speed, and the present invention has been reached.
【0012】また,本発明者らは,溶融シートとCR表
面との間の空気層の厚みをコントロールすることによ
り,また,表面粗さが特定の範囲のCRを用いることに
より,本発明の効果がさらに顕著になることを見出し
た。Further, the inventors of the present invention achieved the effects of the present invention by controlling the thickness of the air layer between the molten sheet and the CR surface and by using the CR having a surface roughness within a specific range. Has become more prominent.
【0013】すなわち、本発明の要旨は、次の(1)〜
(3)である。
(1)Tダイより溶融したポリアミド樹脂を,粗面化処
理したCRの表面にシート状に押し出し,エアーナイフ
装置から空気を吹き付けることによりシートをCR表面
に押し付け,冷却成形した後,延伸するポリアミドフィ
ルムの製造方法であって,冷却ロールとシートの間に介
在する空気層の厚みの平均値T(μm)が10≦T≦100,
空気層の厚みの最大値T max (μm)がT max ≦150の範囲
で,かつ,シートが冷却ロール表面に多点接触するよう
にすることを特徴とするポリアミドフィルムの製造方
法。
(2)冷却ロールの表面粗さ(μm)が0.2≦SRa≦1.0,
1≦SRmax≦4の範囲であるポリアミドフィルムの製造
方法。That is, the gist of the present invention is to provide the following (1)-
(3). (1) a T-die from molten polyamide resin, extruded into a sheet roughening treated CR surface, pressing the sheet to the CR surface by blowing air from the air knife device, after cooling molding, polyamide stretching Phil
A method for manufacturing a rum, which comprises a cooling roll and a sheet.
The average value T (μm) of the thickness of the existing air layer is 10 ≦ T ≦ 100,
The maximum value of air layer thickness T max (μm) is in the range of T max ≤150
So that the sheet makes multiple contact with the surface of the chill roll.
A method for producing a polyamide film, comprising: ( 2 ) Surface roughness (μm) of the cooling roll is 0.2 ≦ SRa ≦ 1.0,
A method for producing a polyamide film, wherein 1 ≦ SRmax ≦ 4.
【0014】次に、本発明について詳細に説明する。図
1は,延伸ポリアミドフィルムの一般的な製造方法の工
程図である。まず,ホッパー1に原料樹脂ペレットを供
給し,押出機2で可塑化溶融し,押出機先端に取り付け
られたTダイ3よりシート状に押し出され,CR4で冷
却固化される。次に,吸水処理工程5を通って,延伸工
程6で縦横2軸方向に延伸され,延伸ポリアミドフィル
ムの製品7として巻き取られる。Next, the present invention will be described in detail. FIG. 1 is a process diagram of a general method for producing a stretched polyamide film. First, raw material resin pellets are supplied to the hopper 1, plasticized and melted by the extruder 2, extruded in a sheet form from the T die 3 attached to the tip of the extruder, and cooled and solidified by CR4. Next, it passes through the water absorption treatment step 5, is stretched in the longitudinal and transverse biaxial directions in a stretching step 6, and is wound up as a stretched polyamide film product 7.
【0015】図2は,本発明のエアーナイフ法による製
膜方法を示す側面図である。Tダイ3より溶融ポリアミ
ドシート8は,CR4の表面に押し出される。この溶融
シートにエアーナイフ装置9よりエアー圧をかけ,CR
表面に押し付け,冷却固化され製膜される。エアーナイ
フ装置からは,高圧ブロワーで送り込まれた空気が,内
部の整流板を通してスリット状の隙間から溶融シートの
巾方向に吹き出される。FIG. 2 is a side view showing a film forming method by the air knife method of the present invention. The molten polyamide sheet 8 is extruded from the T die 3 onto the surface of the CR 4. Air pressure is applied to this molten sheet from the air knife device 9, and CR is applied.
It is pressed against the surface, cooled and solidified to form a film. From the air knife device, the air sent by the high-pressure blower is blown out in the width direction of the molten sheet from the slit-shaped gap through the inner straightening plate.
【0016】図3は,本発明における溶融シートとCR
の間の空気層の厚みの平均値T及び最大値Tmax を示す
模式図である。CR4の表面と溶融ポリアミドシート8
の隙間には,僅かに巻き込み空気10が介在し,部分的に
ランダムに点接触している。FIG. 3 shows a fused sheet and a CR according to the present invention.
It is a schematic diagram which shows the average value T and maximum value Tmax of the thickness of the air layer between. CR4 surface and fused polyamide sheet 8
Air 10 is slightly entrained in the gap of, and is in point contact with a part at random.
【0017】本発明においては,CR表面を粗面化する
ことにより溶融シートとCR表面との間に巻き込まれた
空気層を分散させ,空気層の厚みを均一化し,適度な多
点接触を形成することが重要である。溶融シートとCR
表面が適度に多点接触することにより,実質的にCRの
粗面転写が問題とならず,かつ,モノマーの自己剥離性
も良くなる。In the present invention, by roughening the CR surface, the air layer caught between the molten sheet and the CR surface is dispersed, the thickness of the air layer is made uniform, and a suitable multipoint contact is formed. It is important to. Melt sheet and CR
By appropriately contacting the surfaces at multiple points, the rough surface transfer of CR does not substantially become a problem, and the self-peeling property of the monomer is improved.
【0018】CRの表面粗さ(μm )は,0.2 ≦SRa ≦
1.0,1≦SRmax ≦4の範囲であることが好ましい。C
Rの表面粗さが粗すぎると,巻き込まれた空気は抜け易
いので,エアー圧が低くても均一な薄い空気層が得ら
れ,CR表面に生成したモノマーの自己剥離性も良い
が,CR表面の粗面がシートへ転写されるので好ましく
ない。また,CRの表面粗さが低い場合には,巻き込ま
れた空気が分散し難くなり,高いエアー圧で押し付けて
も空気層の厚みを均一化することが困難となる。The surface roughness (μm) of CR is 0.2 ≤ SRa ≤
The range of 1.0 and 1 ≦ SRmax ≦ 4 is preferable. C
If the surface roughness of R is too rough, the entrapped air will easily escape, so a uniform thin air layer can be obtained even if the air pressure is low, and the self-peeling property of the monomers generated on the CR surface is good, but the CR surface The rough surface of is transferred to the sheet, which is not preferable. Further, when the surface roughness of CR is low, the entrained air becomes difficult to disperse, and it becomes difficult to make the thickness of the air layer uniform even when pressed with a high air pressure.
【0019】また,エアー圧としは,通常 400〜1000mm
Aqの範囲であることが好ましい。エアー圧が 400mmAq未
満の場合は,均一な薄い空気層が得られず,また,1000
mmAqを超えると,吹き付けたエアーがTダイ側に流れて
Tダイが冷却され,溶融シートが振動し,製膜不良の原
因となるので好ましくない。The air pressure is usually 400 to 1000 mm.
It is preferably in the range of Aq. If the air pressure is less than 400 mmAq, a uniform thin air layer cannot be obtained, and 1000
If it exceeds mmAq, the blown air flows to the T-die side, the T-die is cooled, the molten sheet vibrates, and it causes film formation defects, which is not preferable.
【0020】また,本発明においては,溶融シートとC
R表面との間の空気層の厚みを一定の範囲にコントロー
ルすることによって,溶融ポリアミドシートの冷却速度
ならびに結晶化度をさらに均一にコントロールすること
が可能である。すなわち,T(μm)が10≦T≦100,T
max(μm)がTmax≦150の範囲とすることが必要であ
る。Tが10μm未満の場合は,得られたシートの結晶化
度が低く,後の吸水処理工程での伸びや巾変動あるいは
延伸性が不安定となり,また,Tが100μmを超える溶融
シートの冷却速度が遅くなり,ポリアミド樹脂の球晶が
成長して部分的に結晶化度が高くなり結晶化斑が起きや
すい。また,Tmaxが150μmを超えた場合にも,この部
分の溶融シートの冷却速度が遅くなり,同様に結晶化斑
が起きやすい。このような結晶化斑のあるシートを延伸
した場合,延伸斑が発生し,延伸切断して安定して生産
することが困難となる。Further, in the present invention, the molten sheet and C
By controlling the thickness of the air layer between the R surface and the R surface within a certain range, it is possible to more uniformly control the cooling rate and the crystallinity of the molten polyamide sheet. That is, T (μm) is 10 ≦ T ≦ 100, T
It is necessary that max (μm) is within the range of T max ≦ 150
It When T is less than 10 μm, the crystallinity of the obtained sheet is low, the elongation and width change or the stretchability in the subsequent water absorption treatment process become unstable, and the cooling rate of the molten sheet where T exceeds 100 μm Is slowed down, spherulites of the polyamide resin grow and the degree of crystallinity becomes high locally, and crystallization unevenness easily occurs. Also, when T max exceeds 150 μm, the cooling rate of the molten sheet in this portion becomes slow, and similarly crystallization unevenness is likely to occur. When a sheet having such crystallization unevenness is stretched, stretching unevenness occurs, and it becomes difficult to stretch and cut for stable production.
【0021】本発明におけるシートの製膜速度について
は,特に限定されず,鏡面仕上げのCRを用いた場合に
は困難であった 40m/min以上の高速でも製膜が可能であ
る。The film forming speed of the sheet in the present invention is not particularly limited, and it is possible to form a film at a high speed of 40 m / min or more, which is difficult when a CR having a mirror finish is used.
【0022】本発明において用いられるCRの構造は,
内部に冷却媒体(水)が循環する構造を持つ回転冷却ロ
ールである。CRの表面材質としては,硬質クロムメッ
キやセラミック溶射コートを施したものなどが挙げられ
るが,セラミック溶射コートロールの方がモノマーの付
着が少ないので好ましい。The structure of the CR used in the present invention is
It is a rotating cooling roll having a structure in which a cooling medium (water) circulates inside. Examples of the surface material of CR include hard chrome plating and ceramic spray coating, but ceramic spray coating rolls are preferable because they have less monomer adhesion.
【0023】CR表面から剥離されるシートの温度は,
CRの内部を循環する冷却媒の温度,CR表面粗さ,溶
融シートとCR間の空気層の厚みなどを調整することに
より適宜変更することができるが,CRの表面温度は,
15〜60℃の範囲が好ましい。CR表面温度が15℃未満で
は,CR表面に水滴が露結し,水膜によるシートの密着
斑が生じ,製膜上のトラブルの原因となるので好ましく
ない。また,60℃を超えると,シートのCR表面からの
剥離が困難となり,シートが剥離応力によって縦方向に
伸ばされるために,厚み斑が発生したり,シートの平坦
性が大きく損なわれる。The temperature of the sheet peeled from the CR surface is
The temperature of the cooling medium circulating inside the CR, the CR surface roughness, the thickness of the air layer between the molten sheet and the CR, etc. can be appropriately changed, but the surface temperature of the CR is
The range of 15-60 ° C is preferred. When the CR surface temperature is lower than 15 ° C, water droplets are condensed on the CR surface, and uneven adhesion of the sheet due to the water film is generated, which causes troubles in film formation, which is not preferable. On the other hand, when the temperature exceeds 60 ° C., it becomes difficult to peel the sheet from the CR surface, and the sheet is stretched in the longitudinal direction due to peeling stress, resulting in uneven thickness and greatly impairing the flatness of the sheet.
【0024】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11,
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。As the polyamide resin used in the present invention, nylon 6, nylon 66, nylon 11,
Examples include homopolymers such as nylon 12, mixtures thereof, and copolymers.
【0025】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よい。本
発明におけるポリアミドフィルムの延伸方法としては,
同時二軸延伸法、逐次二軸延伸法のいずれの方法も用い
ることができる。The polyamide resin may contain known additives such as stabilizers, antioxidants, fillers, lubricants, antistatic agents, antiblocking agents and coloring agents. The stretching method of the polyamide film in the present invention includes:
Either a simultaneous biaxial stretching method or a sequential biaxial stretching method can be used.
【0026】[0026]
【作用】エアーナイフ法における,シートの結晶化斑の
発生メカニズムは次のように考えられる。溶融シートの
両端部は,ネックインのために中央部より厚みが厚く,
また,メルトテンションがかからない。しかも,シート
端部は巻き込まれた空気が簡単に逃げるため,この部分
の溶融シートがCR表面に先に密着し,両端部に囲まれ
たシート中央部に巻き込まれた空気は抜け道を失い孤立
してしまうことになる。この孤立した空気層によって溶
融シートが持ち上げられ,特に,製膜速度が速くなり,
巻き込まれる随伴空気流圧力が高くなると空気層の厚み
も厚くなり,CRとの接触点がまばらになり,シートに
結晶化斑が発生する。また,CR表面にモノマーの析出
が増えると,溶融シートの冷却が不均一になり,シート
に結晶化斑が発生する。CR表面に析出したモノマー
は,通常,シートと回転するCRとのランダムな接触点
において徐々に剥離される(自己剥離性)。[Function] The mechanism of sheet crystallization unevenness in the air knife method is considered as follows. Both ends of the molten sheet are thicker than the center due to neck-in,
Also, melt tension is not applied. In addition, since the air entrapped at the edge of the sheet easily escapes, the molten sheet in this part adheres to the CR surface first, and the air entrapped in the center of the sheet surrounded by both ends loses its escape route and becomes isolated. Will be lost. This isolated air layer lifts the molten sheet, which accelerates the film formation speed,
When the pressure of the entrained airflow increases, the thickness of the air layer also increases, the contact points with CR become sparse, and crystallization unevenness occurs on the sheet. Further, when the amount of the monomer deposited on the CR surface increases, the cooling of the molten sheet becomes non-uniform, and crystallization unevenness occurs on the sheet. The monomer deposited on the CR surface is usually gradually peeled off at a random contact point between the sheet and the rotating CR (self-peeling property).
【0027】以下,実施例により,本発明をさらに具体
的に説明する。The present invention will be described in more detail with reference to the following examples.
【実施例】本発明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)CR及び製膜シートの表面粗さ
JIS-B0601-1982に準じて,カットオフ 0.8mmで,SRa
(中心線平均粗さ)及びSRmax (最大高さ)を測定し
た。
(2)延伸性
ポリアミドフィルムの二軸延伸性を次のように評価し
た。
○:切断回数≦1回/24時間
△:切断回数2〜9回/24時間
×:切断回数≧10回/24時間
(3)シートとCRの間の空気層の厚み
(株)キーエンス製レーザーフォーカス変位計で測定し
た。EXAMPLES The following characteristic values used in the present invention were measured by the following methods. (1) Surface roughness of CR and film-forming sheet According to JIS-B0601-1982, cut-off 0.8mm, SRa
(Center line average roughness) and SRmax (maximum height) were measured. (2) Stretchability The biaxial stretchability of the polyamide film was evaluated as follows. ◯: Number of cuts ≤ 1 time / 24 hours △: Number of cuts 2 to 9 times / 24 hours ×: Number of cuts ≥ 10 times / 24 hours (3) Thickness of air layer between sheet and CR Laser manufactured by Keyence Corporation It was measured with a focus displacement meter.
【0028】実施例1
シリンダー径65mmの押出機に巾630mm のTダイを付け,
押出温度 260℃でナイロン6(ユニチカ社製 A1030BRF
)をシート状に溶融押し出しした。この溶融シートを
硬質クロムメッキした,表面粗さが SRa 0.4μm ,SRma
x 1.6μm で,直径 600mm,周速30m/min で回転するC
R上にエアーナイフ法で押さえ,厚み 150μm の未延伸
ポリアミドシートを製膜した。エアーナイフ装置は,リ
ップ間隔1mm,巾 600mm,エアー圧 400mmAqで使用し,
また,CRの表面温度は20℃に調整した。シートとCR
の間の空気層の厚みの平均値Tは20μm ,最大値Tmax
は35μm であった。次に,シートを50℃の温水槽に2分
間浸漬した後,延伸温度175 ℃で,縦方向に 3.0倍,横
方向に 3.3倍に同時二軸延伸し,次いで5%の弛緩率で
210℃で熱処理し,厚み15μm の二軸延伸ポリアミドフ
ィルムを製造した。製膜された未延伸ポリアミドシート
のCR接触面側(以下、R面という)と反対面側(以
下、A面という)の表面粗さを測定した結果,及び,二
軸延伸時の延伸性の結果を表1に示した。CRの表面粗
さはR面には転写しておらず,CRと接触していないA
面と同じ表面粗さであった。また,CR表面へのモノマ
ーの析出もなく,延伸性についても良好であった。Example 1 An extruder having a cylinder diameter of 65 mm and a T die having a width of 630 mm was attached to the extruder.
Extrusion temperature of 260 ℃, nylon 6 (A1030BRF manufactured by Unitika Ltd.)
) Was melt extruded into a sheet. This fused sheet is hard chrome plated and has a surface roughness of SRa 0.4 μm and SRma
x 1.6 μm, diameter 600 mm, rotating at a peripheral speed of 30 m / min C
An unstretched polyamide sheet having a thickness of 150 μm was formed on the R by pressing with an air knife method. The air knife device is used with a lip interval of 1 mm, a width of 600 mm, and an air pressure of 400 mmAq.
The surface temperature of CR was adjusted to 20 ℃. Seat and CR
The average value T of the thickness of the air layer is between 20 μm and the maximum value T max
Was 35 μm. Next, the sheet was immersed in a warm water bath at 50 ° C for 2 minutes, then simultaneously biaxially stretched at a stretching temperature of 175 ° C, 3.0 times in the longitudinal direction and 3.3 times in the transverse direction, and then at a relaxation rate of 5%.
Heat treatment was performed at 210 ° C to produce a biaxially stretched polyamide film with a thickness of 15 μm. As a result of measuring the surface roughness of the CR-contacting surface side (hereinafter, referred to as R surface) and the opposite surface side (hereinafter, referred to as A surface) of the formed unstretched polyamide sheet, and the stretchability at the time of biaxial stretching The results are shown in Table 1. The surface roughness of CR is not transferred to the R surface and is not in contact with CR A
The surface roughness was the same as the surface. Further, the monomer was not deposited on the CR surface, and the stretchability was good.
【0029】実施例2
ポリアミド樹脂の吐出量を増加し,製膜速度を60m/min
に調整した。空気層の厚みが30μm になるようにエアー
圧を 800mmAqとした以外は,実施例1と同様にして二軸
延伸ポリアミドフィルムを得た。実施例1と同様の項目
について評価した結果は表1に示したとおりであり,高
速製膜性も良好であった。Example 2 The discharge rate of polyamide resin was increased and the film forming rate was 60 m / min.
Adjusted to. A biaxially stretched polyamide film was obtained in the same manner as in Example 1 except that the air pressure was 800 mmAq so that the thickness of the air layer was 30 μm. The results of evaluating the same items as in Example 1 are as shown in Table 1, and the high-speed film forming property was also good.
【0030】実施例3
エアー圧 400mmAqとした以外は,実施例2と同様にして
二軸延伸ポリアミドフィルムを得た。実施例1と同様の
項目について評価した結果を表1に示した。シートとC
Rの間の空気層の厚みの平均値Tは80μm ,最大値T
max は 140μm であった。Example 3 A biaxially stretched polyamide film was obtained in the same manner as in Example 2 except that the air pressure was 400 mmAq. The results of evaluation of the same items as in Example 1 are shown in Table 1. Sheet and C
The average value T of the air layer thickness between R is 80 μm, and the maximum value T
The max was 140 μm.
【0031】比較例1
表面粗さが SRa 0.08 μm ,SRmax 0.3 μm の鏡面仕上
げの硬質クロムメッキを施したCRを使用した以外は,
実施例1と同様にして二軸延伸ポリアミドフィルムを得
た。結果を表1に示した。溶融シートがCRに密着して
いる部分は透明であるのに対し,孤立した空気層によっ
て浮き上がっている部分は結晶化により白化し,シート
に成形斑が発生した。空気層の厚みの最大値Tmax は 2
00μm であった。延伸工程では,結晶化の高い部分でネ
ックが発生し,延伸切断が多発した。COMPARATIVE EXAMPLE 1 Except for using CR having a surface finish of SRa 0.08 μm and SRmax 0.3 μm, which was hard-chrome plated with a mirror finish.
A biaxially stretched polyamide film was obtained in the same manner as in Example 1. The results are shown in Table 1. The part where the molten sheet was in close contact with CR was transparent, while the part that floated up due to the isolated air layer was whitened due to crystallization, and molding spots were formed on the sheet. The maximum value T max of the thickness of the air layer is 2
It was 00 μm. In the drawing process, necking occurred in the highly crystallized part, and drawing cutting frequently occurred.
【0032】比較例2
未延伸ポリアミドシートを静電密着法により製膜した以
外は,実施例1と同様にして二軸延伸ポリアミドフィル
ムを得た。表1に示したように,得られた二軸延伸ポリ
アミドフィルムのR面の表面粗さが大きく,透明性が低
下し,また,結晶化が低いため吸水処理工程でのトラブ
ル,及び延伸切断が多発した。Comparative Example 2 A biaxially stretched polyamide film was obtained in the same manner as in Example 1 except that an unstretched polyamide sheet was formed by an electrostatic contact method. As shown in Table 1, the obtained biaxially stretched polyamide film has a large surface roughness on the R side and a low transparency, and since crystallization is low, troubles in the water absorption treatment step and stretching cutting are caused. It happened a lot.
【0033】[0033]
【表1】 [Table 1]
【0034】[0034]
【発明の効果】本発明によれば,厚み均一性に優れた延
伸ポリアミドフィルムを,モノマーの析出によるCRの
汚れがなく,工業的に安定して高速度で生産する方法が
提供される。EFFECTS OF THE INVENTION According to the present invention, there is provided a method for producing a stretched polyamide film having excellent thickness uniformity, which is industrially stable and at a high speed without causing CR stains due to the precipitation of monomers.
【図1】本発明のポリアミドフィルムを製造する方法の
一例を示す。FIG. 1 shows an example of a method for producing a polyamide film of the present invention.
【図2】本発明におけるエアーナイフ法によるシートの
製膜方法を示す側面図である。FIG. 2 is a side view showing a film forming method of a sheet by an air knife method according to the present invention.
【図3】本発明における溶融シートとCRの間の空気層
の厚みの平均値及び最大値の模式図である。FIG. 3 is a schematic diagram of the average and maximum values of the thickness of the air layer between the molten sheet and CR in the present invention.
【符号の説明】 1 ホッパー 2 押出機 3 Tダイ 4 キャスティングロール(CR) 5 吸水処理工程 6 延伸工程 7 フィルム巻き取り製品 8 溶融ポリアミドシート 9 エアーナイフ装置 10 巻き込み空気[Explanation of symbols] 1 hopper 2 extruder 3 T die 4 casting rolls (CR) 5 Water absorption process 6 Stretching process 7 Film winding products 8 fused polyamide sheet 9 Air knife device 10 Entrained air
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平7−290664(JP,A) 特開 昭55−17559(JP,A) 特開 昭56−105930(JP,A) 特開 昭60−247540(JP,A) 特開 昭46−439(JP,A) 特開 昭61−118215(JP,A) 特開 平9−99471(JP,A) (58)調査した分野(Int.Cl.7,DB名) B29C 47/00 - 47/96 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-7-290664 (JP, A) JP-A-55-17559 (JP, A) JP-A-56-105930 (JP, A) JP-A-60- 247540 (JP, A) JP-A-46-439 (JP, A) JP-A-61-118215 (JP, A) JP-A-9-99471 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B29C 47/00-47/96
Claims (2)
面化処理した回転冷却ロールの表面にシート状に押し出
し,エアーナイフ装置から空気を吹き付けることにより
シートをロール表面に押し付け,冷却成形した後,延伸
するポリアミドフィルムの製造方法であって,冷却ロー
ルとシートの間に介在する空気層の厚みの平均値T(μ
m)が10≦T≦100,空気層の厚みの最大値T max (μm)
がT max ≦150の範囲で,かつ,シートが冷却ロール表面
に多点接触するようにすることを特徴とするポリアミド
フィルムの製造方法。1. A polyamide resin melted from a die is extruded in a sheet shape onto the surface of a surface-roughened rotary cooling roll, and air is blown from an air knife device to press the sheet onto the roll surface, followed by cooling and molding. A method for producing a stretched polyamide film, comprising:
The average value of the thickness of the air layer T (μ
m) is 10 ≦ T ≦ 100, and the maximum value of the thickness of the air layer is T max (μm)
Is within the range of T max ≦ 150, and the sheet is the surface of the cooling roll.
A method for producing a polyamide film, which comprises making multi-point contact with a film.
a≦1.0,1≦SRmax≦4の範囲である請求項1記載のポ
リアミドフィルムの製造方法。2. The surface roughness (μm) of the cooling roll is 0.2 ≦ SR.
method for producing a polyamide film according to claim 1, wherein a range of a ≦ 1.0,1 ≦ SRmax ≦ 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32147095A JP3369381B2 (en) | 1995-12-11 | 1995-12-11 | Method for producing polyamide film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32147095A JP3369381B2 (en) | 1995-12-11 | 1995-12-11 | Method for producing polyamide film |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09155952A JPH09155952A (en) | 1997-06-17 |
JP3369381B2 true JP3369381B2 (en) | 2003-01-20 |
Family
ID=18132932
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---|---|---|---|
JP32147095A Expired - Fee Related JP3369381B2 (en) | 1995-12-11 | 1995-12-11 | Method for producing polyamide film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3369381B2 (en) |
Cited By (1)
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CN102848552A (en) * | 2011-06-29 | 2013-01-02 | 尤尼吉可株式会社 | Method for manufacturing polyamide membrane |
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KR20010002581A (en) * | 1999-06-16 | 2001-01-15 | 홍순달 | A method of manufacturing for nylon flat yarn |
JP4641673B2 (en) * | 2001-07-06 | 2011-03-02 | ユニチカ株式会社 | Method for producing polyamide film |
JP5247110B2 (en) * | 2007-10-11 | 2013-07-24 | ユニチカ株式会社 | Evaporated polyamide resin film and film roll using the same |
CN102922649A (en) * | 2012-11-02 | 2013-02-13 | 浙江福鑫龙机械有限公司 | Air nozzle film-blowing device |
JP7141683B2 (en) * | 2018-03-29 | 2022-09-26 | ユニチカ株式会社 | Polyamide film manufacturing apparatus and manufacturing method |
-
1995
- 1995-12-11 JP JP32147095A patent/JP3369381B2/en not_active Expired - Fee Related
Cited By (1)
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CN102848552A (en) * | 2011-06-29 | 2013-01-02 | 尤尼吉可株式会社 | Method for manufacturing polyamide membrane |
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