JPH11333909A - Production of polyamide film - Google Patents

Production of polyamide film

Info

Publication number
JPH11333909A
JPH11333909A JP10148682A JP14868298A JPH11333909A JP H11333909 A JPH11333909 A JP H11333909A JP 10148682 A JP10148682 A JP 10148682A JP 14868298 A JP14868298 A JP 14868298A JP H11333909 A JPH11333909 A JP H11333909A
Authority
JP
Japan
Prior art keywords
cooling body
sheet
film
polyamide
aqueous solution
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
Application number
JP10148682A
Other languages
Japanese (ja)
Inventor
Shoji Nishimoto
彰二 西本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unitika Ltd
Original Assignee
Unitika Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Unitika Ltd filed Critical Unitika Ltd
Priority to JP10148682A priority Critical patent/JPH11333909A/en
Publication of JPH11333909A publication Critical patent/JPH11333909A/en
Pending legal-status Critical Current

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  • 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

PROBLEM TO BE SOLVED: To obtain a polyamide film excellent in smoothness by a method in which a polyamide resin containing a hydrophobic additive is melted, extruded into a sheet, solidified on a cooling body on which an aqueous solution containing a surfactant whose surface tension is specified is applied continuously, and stretched. SOLUTION: A polyamide resin containing a hydrophobic additive such as ethylene-bis-stearoamide is extruded from a die 4, contacted with a cooling body 1 rotating in the arrow 8 direction through an air layer, cooled/solidified, and moved with the rotating cooling body 1, and a polyamide sheet 6 is peeled from the cooling body 1. From a water pipe 3, a surfactant of 45 dyne/cm or below in surface tension, e.g. a polyoxyethylene monoether aqueous solution, is made to flow down in order to form a liquid membrane on the surface of the cooling body 1. While the polyamide sheet 6 being peeled from the cooling body 1, no liquid membrane is formed on the surface of the cooling body 1, and by stretching the sheet obtained by this method, a film excellent in smoothness is obtained.

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、疎水性添加物を含
有するポリアミド樹脂を主たる原料とした表面平滑性に
優れたポリアミドフィルムを製造する方法に関する。
TECHNICAL FIELD The present invention relates to a method for producing a polyamide film having excellent surface smoothness using a polyamide resin containing a hydrophobic additive as a main raw material.

【0002】[0002]

【従来の技術】ポリアミド樹脂を溶融し、キャスト製膜
法により表面平滑性に優れたフィルムを製造する方法と
しては、ダイスから押し出された溶融シートを電界の作
用により冷却体(金属、セラミック等で覆われた表面を
持つ円筒状の回転体)に密着させる静電密着法(ピニン
グ法)がしばしば用いられる。しかし、この方法を用い
た場合の問題点として、未延伸シートに小さな泡状の窪
みが発生し、延伸時に問題となったり、冷却体上で急冷
される結果、ポリアミド樹脂が結晶化せず、製造工程で
取扱いに支障をきたしたり、延伸される段階においてボ
ーイングとよばれる現象が発生し、延伸後のフィルムの
幅方向の物性が不均一となるなどの現象が発生する場合
がある。
2. Description of the Related Art As a method of manufacturing a film having excellent surface smoothness by casting a polyamide resin by melting a polyamide resin, a molten sheet extruded from a die is cooled by a cooling body (metal, ceramic, etc.) by the action of an electric field. An electrostatic contact method (pinning method) of bringing the device into close contact with a cylindrical rotating body having a covered surface) is often used. However, as a problem when using this method, a small bubble-like dent is generated in the unstretched sheet, which causes a problem at the time of stretching or is rapidly cooled on a cooling body, so that the polyamide resin does not crystallize, In the manufacturing process, there is a case where handling is hindered, a phenomenon called bowing occurs at the stage of stretching, and a phenomenon such as uneven physical properties in the width direction of the stretched film occurs.

【0003】一般にボーイングの大きなフィルムは、物
性がフィルム幅方向に不均一であり、また、熱収縮率の
最大値を示す方向が、フィルムの進行方向(縦方向)に
対して斜めになるためレトルト包装等の用途では、袋が
ねじれたように変形するため使用できないという問題が
ある。このような静電密着法を用いずに製膜すれば、上
記の静電密着法特有の問題を回避することはできるが、
押し出されたシートと冷却体が密着せず、空気層を通し
て溶融ポリアミド樹脂からモノマーやオリゴマーが蒸発
し、冷却体表面に付着、堆積する。このような付着物に
より冷却体表面の形状が変化し、シート表面の平滑性が
損なわれたり、冷却体表面の熱伝導率が不均一になり、
シートに冷却斑が発生し、その後の延伸工程に支障をき
たすという問題が起こりやすい。
In general, a film having a large bowing has non-uniform physical properties in the width direction of the film, and the direction in which the maximum value of the heat shrinkage is maximized is oblique with respect to the advancing direction (vertical direction) of the film. In applications such as packaging, there is a problem that the bag cannot be used because it deforms like a twist. If the film is formed without using such an electrostatic adhesion method, the above-described problems unique to the electrostatic adhesion method can be avoided,
The extruded sheet and the cooling body do not adhere to each other, and the monomer or oligomer evaporates from the molten polyamide resin through the air layer, and adheres and deposits on the cooling body surface. Such a deposit changes the shape of the cooling body surface, impairs the smoothness of the sheet surface, or makes the thermal conductivity of the cooling body surface non-uniform,
The problem that cooling unevenness occurs in the sheet and hinders the subsequent stretching process is likely to occur.

【0004】このような冷却体表面に付着したモノマー
やオリゴマーを除去する方法としては、冷却体表面を水
で洗浄する方法があるが、洗浄水が冷却体上を流下する
間に集束し易いため、通常の生産スピードで製膜するた
めには洗浄水を多量に用いなければならないという問題
がある。また、ポリアミドフィルムには物性の改良を目
的として種々の添加剤が配合されるが、特に、添加剤が
疎水性化合物の場合には、冷却体に付着した添加物によ
り冷却体表面が疎水性になり、均一な液膜を形成させる
ことがさらに困難になり洗浄が実質上不可能になる。
[0004] As a method for removing such monomers and oligomers adhering to the surface of the cooling body, there is a method of washing the surface of the cooling body with water. However, since the washing water tends to converge while flowing down on the cooling body. However, there is a problem that a large amount of washing water must be used to form a film at a normal production speed. In addition, various additives are blended in the polyamide film for the purpose of improving the physical properties. In particular, when the additive is a hydrophobic compound, the surface of the cooling body becomes hydrophobic by the additive attached to the cooling body. Therefore, it becomes more difficult to form a uniform liquid film, and cleaning becomes substantially impossible.

【0005】[0005]

【発明が解決しようとする課題】本発明は、疎水性化合
物を含有したポリアミド樹脂原料を用いてポリアミドフ
ィルムを製造する方法において、静電密着法を用いずに
冷却体表面の付着物を少量の洗浄液で、効率よく除去す
ることにより、平滑性に優れたポリアミドフィルムを製
造する方法を提供することを目的とするものである。
SUMMARY OF THE INVENTION The present invention relates to a method for producing a polyamide film using a polyamide resin raw material containing a hydrophobic compound. It is an object of the present invention to provide a method for producing a polyamide film having excellent smoothness by efficiently removing it with a cleaning liquid.

【0006】[0006]

【課題を解決するための手段】本発明者らは、上記の課
題を解決するために鋭意検討を重ねた結果、特有の表面
張力を有する水溶液を連続的に塗布し冷却体表面に均一
な液膜を形成させることにより、疎水性化合物を含有し
たポリアミドフィルムを製造する場合にも、冷却体表面
の付着物を効率よく除去することができ、表面平滑性に
優れたフィルムを製造することができることを見出し本
発明に到達した。
Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have continuously applied an aqueous solution having a specific surface tension to form a uniform liquid on the surface of the cooling body. By forming a film, even when a polyamide film containing a hydrophobic compound is produced, it is possible to efficiently remove deposits on the surface of the cooling body and produce a film having excellent surface smoothness. And arrived at the present invention.

【0007】すなわち、本発明の要旨は、疎水性添加物
を含有するポリアミド樹脂を溶融してシート状に押し出
し、冷却体上で固化させ、これを延伸してフィルムを製
造する工程において、冷却体上に表面張力が45dyne/c
m 以下の界面活性剤を含有した水溶液を連続的に塗布
し、冷却体上の付着物を取り除きながらシートを成形
し、これを延伸することを特徴とするポリアミドフィル
ムの製造方法にある。
[0007] That is, the gist of the present invention is that a polyamide resin containing a hydrophobic additive is melted, extruded into a sheet, solidified on a cooling body, and stretched to produce a film. Surface tension is 45dyne / c on top
The present invention provides a method for producing a polyamide film, comprising continuously applying an aqueous solution containing a surfactant of m or less, forming a sheet while removing deposits on a cooling body, and stretching the sheet.

【0008】[0008]

【発明の実施の形態】次に、本発明をさらに具体的に説
明する本発明において用いられるポリアミド樹脂として
は、たとえば、ナイロン6、、ナイロン66、ナイロン
6/66共重合体、ナイロン12などが挙げられる。こ
れらのポリアミドの内、ナイロン6は物性面等において
最も好ましく、本発明の製法を用いることによって原料
樹脂中のモノマーやオリゴマーが効率的に除去され、優
れた特性を有するフィルムが得られる。
BEST MODE FOR CARRYING OUT THE INVENTION The polyamide resin used in the present invention for explaining the present invention more specifically will be, for example, nylon 6, nylon 66, nylon 6/66 copolymer, nylon 12, and the like. No. Among these polyamides, nylon 6 is most preferable in terms of physical properties and the like, and by using the production method of the present invention, monomers and oligomers in the raw material resin are efficiently removed, and a film having excellent properties is obtained.

【0009】ポリアミドフィルムの改質を目的として配
合される疎水性添加物としては、たとえば、ステアリン
酸マグネシウム、ステアリン酸バリウム、ヒドロキシス
テアリン酸等の押出性改良剤、モンタン酸ワックス、エ
チレンビスステアロアマイド、オレイルアミド等の有機
スリップ剤などを挙げることができる。特に、エチレン
ビスステアロアマイドは熱安定性に優れ、また、少量の
添加でフィルムの透明性を損ねることなく、滑り性を向
上させることができる。
Examples of the hydrophobic additive compounded for the purpose of modifying the polyamide film include extrudability improvers such as magnesium stearate, barium stearate, and hydroxystearic acid, montanic acid wax, and ethylenebis stearamide. And organic slip agents such as oleylamide. In particular, ethylene bisstearamide is excellent in thermal stability, and can improve the slipping property without impairing the transparency of the film by adding a small amount.

【0010】本発明においては、冷却体表面に45dyne
/cm 以下の界面活性剤を含有した水溶液を連続的に塗布
される。水溶液の表面張力が45dyne/cm よりも高い
と、均一な厚みの水溶液の膜を形成することが困難とな
り、本発明の目的を達成することができない。
In the present invention, 45 dyne is applied to the surface of the cooling body.
An aqueous solution containing a surfactant of not more than / cm 2 is continuously applied. If the surface tension of the aqueous solution is higher than 45 dyne / cm 2, it becomes difficult to form a film of the aqueous solution having a uniform thickness, and the object of the present invention cannot be achieved.

【0011】界面活性剤を含有した洗浄液としては、起
泡性が 本発明における冷却体表面の界面活性剤を含有
した洗浄液としては、起泡性が低く均一な液膜が形成さ
れる点で、下記式(1)で表されるポリオキシエチレン
モノエーテル(PEGE)の水溶液が最も好適である。 HO−(CH2 −CH2 −O)n−R (1) (nは3〜20の整数、Rは炭素数12以上のアルキル
基、アリール基から選ばれた疎水性基) 式(1)において、PEGEの、疎水性基Rとしては、
たとえば、ステアリル基、オレイル基などのアルキル基
やフェニル基、ノニルフェニル基などのアリール基が挙
げられる。疎水性基Rにヒドロキシル基、アミノ基、ス
ルフォン酸基などの極性あるいは、イオン解離性の置換
基を有するものは、溶液の界面活性剤としての効果が得
られないので好ましくない。PEGEのエチレングリコ
ール単位の繰り返し数nは、3〜20が好ましい。nが
3以下では水溶性が不十分であり、20以上では界面活
性剤としての効果が低下したり、水溶液の粘度が高くな
るため冷却体上に均一な液膜を形成させることが困難に
なる。
The cleaning liquid containing a surfactant has a foaming property. The cleaning liquid containing a surfactant on the surface of the cooling body of the present invention has a low foaming property and a uniform liquid film is formed. An aqueous solution of polyoxyethylene monoether (PEGE) represented by the following formula (1) is most preferred. HO- (CH 2 -CH 2 -O) n-R (1) (n is 3 to 20 integer, R represents an alkyl group having 12 or more carbon atoms, the hydrophobic group selected from aryl group) Formula (1) In the PEGE, as the hydrophobic group R,
Examples include an alkyl group such as a stearyl group and an oleyl group, and an aryl group such as a phenyl group and a nonylphenyl group. Those having a polar or ionic dissociative substituent such as a hydroxyl group, an amino group or a sulfonic acid group in the hydrophobic group R are not preferred because the effect as a surfactant in a solution cannot be obtained. The number n of repeating ethylene glycol units in PEGE is preferably from 3 to 20. When n is 3 or less, the water solubility is insufficient, and when n is 20 or more, the effect as a surfactant is reduced or the viscosity of the aqueous solution becomes high, so that it is difficult to form a uniform liquid film on the cooling body. .

【0012】PEGE水溶液の濃度は、50〜50,0
00ppm が好ましい。50ppm 以下では、PEGE水溶
液の表面張力が45dyne/cm を超え、また、50,00
0ppm 以上になると、PEGE水溶液の粘度が上昇し冷
却体上で液膜が十分に拡がらず、流下する速度も低下す
るため、冷却体上に均一な液膜を形成させることが困難
となる。
The concentration of the aqueous PEGE solution is 50 to 50,0.
00 ppm is preferred. At 50 ppm or less, the surface tension of the PEGE aqueous solution exceeds 45 dyne / cm, and
If the concentration is 0 ppm or more, the viscosity of the aqueous solution of PEGE increases, the liquid film does not spread sufficiently on the cooling body, and the speed of flowing down decreases, so that it is difficult to form a uniform liquid film on the cooling body.

【0013】次に、本発明を実施するための製膜装置を
図1の模式図によって説明する。ダイス4から押し出さ
れたポリアミド溶融シート5は、矢印8の方向に回転す
る冷却体1に空気層を介して接し冷却固化され、回転す
る冷却体1と共に移動し、ポリアミドシート6が冷却体
1から剥離される。水管3からは、PEGE水溶液が流
下され、冷却体1の表面に液膜が形成される。水管3の
上部及び下部に設けられたワイパー2及び2’によっ
て、冷却体1の表面の液膜は除去され、PEGE水溶液
は水受け皿7に集められる。上記のようにしてポリアミ
ドシートを製膜することによって、ダイス4から押し出
されたシート5が、冷却体1上に流延され、薄い空気層
を介して接して冷却固化され、冷却体1からポリアミド
シート6が剥離される間においては、冷却体1の表面に
は液膜は形成されず、この方法により得られたシートを
延伸することによって平滑性に優れたフィルムが製造さ
れる。
Next, a film forming apparatus for carrying out the present invention will be described with reference to the schematic diagram of FIG. The polyamide molten sheet 5 extruded from the die 4 contacts the cooling body 1 rotating in the direction of arrow 8 via an air layer, is cooled and solidified, moves together with the rotating cooling body 1, and the polyamide sheet 6 is removed from the cooling body 1. Peeled off. The aqueous PEGE solution flows down from the water pipe 3 to form a liquid film on the surface of the cooling body 1. The liquid film on the surface of the cooling body 1 is removed by the wipers 2 and 2 ′ provided at the upper and lower parts of the water pipe 3, and the aqueous PEGE solution is collected in the water receiving tray 7. By forming a polyamide sheet into a film as described above, the sheet 5 extruded from the die 4 is cast on the cooling body 1 and is cooled and solidified by contacting through a thin air layer. While the sheet 6 is peeled off, no liquid film is formed on the surface of the cooling body 1, and by stretching the sheet obtained by this method, a film having excellent smoothness is manufactured.

【0014】なお、冷却体上に洗浄液を供給する装置と
しては、滴下装置、スプレー管、あるいは、洗浄液を浸
透させたフェルト等を用いることができる。また、冷却
体の表面の付着物の洗浄効果をさらに高めるために、冷
却体上の液膜が形成されている部分に回転砥石などの研
磨装置を設けることもできる。
As a device for supplying the cleaning liquid onto the cooling body, a dripping device, a spray tube, a felt impregnated with the cleaning liquid, or the like can be used. Further, in order to further enhance the effect of cleaning the deposits on the surface of the cooling body, a polishing device such as a rotary grindstone may be provided in a portion of the cooling body where the liquid film is formed.

【0015】[0015]

【実施例】次に、本発明を実施例によりさらに具体的に
説明する。
Next, the present invention will be described more specifically with reference to examples.

【0016】実施例1 図1に示すように冷却体1の上方に設けられた80mm間
隔の直径1mmの小孔を有する内径10mmの水管3からポ
リオキシエチレングリコールステアリルエーテル(ノイ
ゲンET-157、第一工業製薬社製、式(1)においてn=
8)の500ppm 水溶液(表面張力36dyne/cm )を毎
分750cc滴下した。水管3の上部及び下部にはワイパ
ー2,2’を冷却体の軸に平行に設置した。ナイロン6
に対して、600ppm のエチレンビスステアロアミド
(第一工業製薬社製 EBA200 )を添加した原料を用いた
他は比較例1と同様の条件でシートの成形及び延伸を行
い、厚さ15μm の延伸ナイロン6フィルムを製造し
た。シート成形中も冷却体上には均一に水膜が形成さ
れ、オリゴマーは洗浄液によって溶解され除去された。
シートは全体が均一に冷却され、得られた延伸フィルム
は、厚み及び幅方向の物性が均一であり、また、スリッ
プ性がナイロン6樹脂単体からなるフィルムに比べ優れ
ていた。
EXAMPLE 1 As shown in FIG. 1, a polyoxyethylene glycol stearyl ether (Neugen ET-157, Neugen ET-157, Manufactured by Ichi Kogyo Seiyaku Co., Ltd., where n =
750 cc of a 500 ppm aqueous solution (8) (surface tension: 36 dyne / cm 2) was dropped. Wipers 2 and 2 'were installed above and below the water pipe 3 in parallel with the axis of the cooling body. Nylon 6
On the other hand, the sheet was molded and stretched under the same conditions as in Comparative Example 1 except that a raw material to which 600 ppm of ethylenebisstearamide (EBA200 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was added, and stretched to a thickness of 15 μm. A nylon 6 film was manufactured. During the sheet formation, a water film was uniformly formed on the cooling body, and the oligomer was dissolved and removed by the washing liquid.
The entire sheet was cooled uniformly, and the obtained stretched film had uniform physical properties in the thickness and width directions, and was excellent in slip properties as compared with a film made of nylon 6 resin alone.

【0017】実施例2 洗浄液としてポリオキシエチレングリコールラウリルエ
ーテル(ノイゲン ET-190 、第一工業製薬社製、式
(1)におけるn=20)の200ppm 水溶液(表面張
力40dyne/cm )を用いた他は実施例1と同様の原料及
び条件で延伸ナイロン6フィルムを製造した。シートは
全体が均一に冷却されており、得られた延伸フィルム
は、厚み及び幅方向の物性は均一であり、また、スリッ
プ性がナイロン6樹脂単体からなるフィルムに比べ優れ
ていた。
Example 2 A 200 ppm aqueous solution (surface tension 40 dyne / cm) of polyoxyethylene glycol lauryl ether (Neugen ET-190, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., n = 20 in formula (1)) was used as a washing liquid. Manufactured a stretched nylon 6 film using the same raw materials and conditions as in Example 1. The entire sheet was uniformly cooled, and the obtained stretched film had uniform thickness and physical properties in the width direction, and was excellent in slip properties as compared with a film made of nylon 6 resin alone.

【0018】比較例1 シリンダー径65mmの単軸押出機に幅650mmのT型ダ
イスを付け、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
溶融シートをクロムメッキした鏡面状の表面の直径75
0mm、周速10m/min で回転する円筒状の冷却体上に流
延し、回転角200°の間冷却体に接触させて冷却し剥
離させ、厚さ150μm のシートを成形した。この状態
で10分間連続してシートの成形を行った。冷却体の表
面に水溶性のオリゴマーの白色結晶が円盤状に付着し、
シート表面にもその形状が転写された。次に、シートを
50℃の温水槽に2分間浸漬した後、175℃で縦方向
に3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、厚さ15μm の延伸
フィルムを製造した。延伸工程での切断が多発し、ま
た、得られたフィルムは、結晶化が不均一のため厚み斑
が大きかった。
Comparative Example 1 A T-die having a width of 650 mm was attached to a single-screw extruder having a cylinder diameter of 65 mm, and nylon 6 (A1030BRF manufactured by Unitika) was melt-extruded into a sheet at an extrusion temperature of 260 ° C. This fused sheet is chrome-plated.
It was cast on a cylindrical cooling body rotating at 0 mm and a peripheral speed of 10 m / min, contacted with the cooling body for a rotation angle of 200 °, cooled and peeled, and a 150 μm thick sheet was formed. In this state, the sheet was continuously formed for 10 minutes. White crystals of the water-soluble oligomer adhere to the surface of the cooling body in a disc shape,
The shape was transferred to the sheet surface. Next, the sheet was immersed in a warm water bath at 50 ° C. for 2 minutes, and then simultaneously biaxially stretched at 175 ° C. three times in the machine direction and 3.3 times in the transverse direction.
% At a relaxation rate of 210 ° C. to produce a stretched film having a thickness of 15 μm. The film was frequently cut in the stretching step, and the obtained film had large unevenness in thickness due to non-uniform crystallization.

【0019】比較例2 洗浄液としてイオン交換水を用いた他は実施例1と同様
の原料及び条件で延伸ナイロン6フィルムを製造した。
シートの成形を行う前には、冷却体上の2本のワイパー
の間には水膜が形成されたが、成形を始めて2分後に
は、滴下された水はそのまま5mm幅程度の細い流れとな
り、水膜を形成しなくなった。このため、ワイパー2の
一部が乾燥し、冷却体との摩擦で振動を生じ、更にオリ
ゴマーが十分洗浄除去されずワイパー2を押し上げるた
め、水滴やオリゴマーが冷却体に付着した状態でシート
の成形が行われ、冷却斑のあるシートしか得られなかっ
た。これを比較例1と同様にして延伸した場合、延伸切
断が多発し、得られたフィルムは、物性の幅方向の均一
性、ヘイズ等の性能の劣ったものであった。
Comparative Example 2 A stretched nylon 6 film was produced using the same raw materials and conditions as in Example 1 except that ion-exchanged water was used as a washing liquid.
Before forming the sheet, a water film was formed between the two wipers on the cooling body, but after 2 minutes from the start of the forming, the dropped water became a narrow flow of about 5 mm width as it was. , No water film was formed. For this reason, a part of the wiper 2 is dried, and vibration occurs due to friction with the cooling body. Further, since the oligomer is not sufficiently removed by washing and the wiper 2 is pushed up, the sheet is formed in a state where water droplets and oligomers adhere to the cooling body. Was performed, and only a sheet having cooling spots was obtained. When this was stretched in the same manner as in Comparative Example 1, stretching and cutting frequently occurred, and the resulting film was inferior in properties such as uniformity of physical properties in the width direction and haze.

【0020】[0020]

【発明の効果】本発明によれば、疎水性の添加物を含有
するポリアミドフィルムを製膜する方法において、冷却
体表面の付着物を少量の洗浄液で効率よく除去しながら
ポリアミド溶融シートを冷却体に直接接触させずに製膜
し、これを延伸することにより、表面平滑性に優れたフ
ィルムが得られる。また、ポリアミド溶融シートの結晶
化度を適度にコントロールできるため均一な物性の延伸
フィルムが得られる。
According to the present invention, in a method for producing a polyamide film containing a hydrophobic additive, a polyamide molten sheet is efficiently removed with a small amount of a washing liquid while adhering to the surface of a cooling body. A film having excellent surface smoothness can be obtained by forming a film without directly contacting the film and stretching the film. Further, since the crystallinity of the polyamide melt sheet can be controlled appropriately, a stretched film having uniform physical properties can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明におけるポリアミド溶融シートを製造す
るための装置の側面図である。
FIG. 1 is a side view of an apparatus for producing a polyamide molten sheet according to the present invention.

【符号の説明】[Explanation of symbols]

1;冷却体 2,2’;ワイパー 3;水管 4;ダイス 5;ポリアミド溶融シート 6;ポリアミドシート 7;水受け皿 8;冷却体の回転方向 Reference Signs List 1; cooling body 2, 2 '; wiper 3; water pipe 4; dice 5; polyamide molten sheet 6; polyamide sheet 7; water receiving tray 8;

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 疎水性添加物を含有するポリアミド樹脂
を溶融してシート状に押し出し、冷却体上で固化させ、
これを延伸してフィルムを製造する工程において、冷却
体上に表面張力が45dyne/cm 以下の界面活性剤を含有
した水溶液を連続的に塗布し、冷却体上の付着物を取り
除きながらシートを成形し、これを延伸することを特徴
とするポリアミドフィルムの製造方法。
1. A polyamide resin containing a hydrophobic additive is melted, extruded into a sheet, and solidified on a cooling body.
In the process of stretching and producing a film, an aqueous solution containing a surfactant having a surface tension of 45 dyne / cm or less is continuously applied on the cooling body, and the sheet is formed while removing the deposits on the cooling body. And producing the polyamide film.
【請求項2】 疎水性添加物がエチレンビスステアロア
マイドである請求項1記載のポリアミドフィルムの製造
方法。
2. The method for producing a polyamide film according to claim 1, wherein the hydrophobic additive is ethylene bis-stearamide.
【請求項3】 界面活性剤が、下記式(1)で表される
ポリオキシエチレンモノエーテルの濃度50〜50,0
00ppm の水溶液である請求項1又は2記載のポリアミ
ドフィルムの製造方法。 HO−(CH2 −CH2 −O)n−R (1) (nは3〜20の整数、Rは炭素数12以上のアルキル
基、アリール基から選ばれた疎水性基)
3. The surfactant according to claim 1, wherein the concentration of the polyoxyethylene monoether represented by the following formula (1) is 50 to 50,0,0.
3. The method for producing a polyamide film according to claim 1, which is a 00 ppm aqueous solution. HO- (CH 2 -CH 2 -O) n-R (1) (n is 3 to 20 integer, R represents a hydrophobic group selected alkyl group having 12 or more carbon atoms, aryl group)
JP10148682A 1998-05-29 1998-05-29 Production of polyamide film Pending JPH11333909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10148682A JPH11333909A (en) 1998-05-29 1998-05-29 Production of polyamide film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10148682A JPH11333909A (en) 1998-05-29 1998-05-29 Production of polyamide film

Publications (1)

Publication Number Publication Date
JPH11333909A true JPH11333909A (en) 1999-12-07

Family

ID=15458252

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10148682A Pending JPH11333909A (en) 1998-05-29 1998-05-29 Production of polyamide film

Country Status (1)

Country Link
JP (1) JPH11333909A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009269298A (en) * 2008-05-08 2009-11-19 Japan Steel Works Ltd:The Equipment and method of cleaning surface of dice
CN111300784A (en) * 2020-03-10 2020-06-19 新纶复合材料科技(常州)有限公司 Nylon characteristic and preparation method of aluminum-plastic composite film using nylon with characteristic

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009269298A (en) * 2008-05-08 2009-11-19 Japan Steel Works Ltd:The Equipment and method of cleaning surface of dice
CN111300784A (en) * 2020-03-10 2020-06-19 新纶复合材料科技(常州)有限公司 Nylon characteristic and preparation method of aluminum-plastic composite film using nylon with characteristic

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