JPS5855221A - Flatness inprovement in drawn polyamide film - Google Patents
Flatness inprovement in drawn polyamide filmInfo
- Publication number
- JPS5855221A JPS5855221A JP15379781A JP15379781A JPS5855221A JP S5855221 A JPS5855221 A JP S5855221A JP 15379781 A JP15379781 A JP 15379781A JP 15379781 A JP15379781 A JP 15379781A JP S5855221 A JPS5855221 A JP S5855221A
- Authority
- JP
- Japan
- Prior art keywords
- film
- stretched
- polyamide
- stretched film
- temperature
- 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
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、延伸に引き続いて熱固定した実質的に線状ポ
リアミドよりなる延伸フィルムの平面性改良方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the flatness of a stretched film made of substantially linear polyamide that has been stretched and subsequently heat-set.
ポリアミド延伸フィルムは、優れた強靭性、耐熱性、透
明性等を有しているため、食品その他の包装用基材フィ
ルムとして広く利用されている。Stretched polyamide films have excellent toughness, heat resistance, transparency, etc., and are therefore widely used as base films for packaging foods and other products.
例えば食品包装袋とするためには、通常、印刷、ラミ、
製袋、食品充填、ヒートシールが行われる。For example, in order to make food packaging bags, printing, lamination,
Bag making, food filling, and heat sealing are performed.
この場合、基材フィルムの平面性の良否が、印刷、シミ
、製袋工程の生産スピード、歩留シに大きな影響を及ば
ず。すなわち、基材フィルムにたるみがあると、印刷時
ピッチずれが発生したり、ラミ、製袋時、皺が発生し、
生産スピードも上げることができない。したがって、基
材フィルムの平面性、特にたるみ改良に対する要請はき
わめて強い。In this case, the flatness of the base film does not have a large effect on printing, staining, production speed in the bag making process, or yield. In other words, if there is slack in the base film, pitch deviations may occur during printing, lamination, and wrinkles may occur during bag making.
Production speed cannot be increased. Therefore, there is an extremely strong demand for improving the flatness of the base film, especially improving the sag.
一方、近年、レトルト食品包装分野では、高温短時間殺
菌のハイレトルト化の方向にあシ、包装用基材フィルム
は、一段と耐熱性が要求、されつつある。ポリアミド延
伸フィルム、中でも特に２軸延伸フイルムは、この要求
を満足するものであるが、寸法安定性を向上させるにし
たがって、平面性、特にたるみが増える傾向にあり、十
分満足のいくものは得られていない。On the other hand, in recent years, in the field of retort food packaging, there has been a shift toward high-temperature, short-time sterilization in retort packaging, and packaging base films are being required to be even more heat resistant. Polyamide stretched films, especially biaxially stretched films, satisfy this requirement, but as dimensional stability is improved, flatness, especially sag, tends to increase, making it difficult to obtain a fully satisfactory film. Not yet.
この点につき、２軸延伸フイルムを例にとり、さらに詳
細に説明する。This point will be explained in more detail by taking a biaxially stretched film as an example.
第１図はポリヘキサメチレンアジパミド２軸延伸フイル
ムについて、横軸に寸法安定性の尺度として、１３５℃
−１０分熱水浸漬時の熱水収縮率をとり、縦軸にたるみ
量をとったグラフである。Figure 1 shows a polyhexamethylene adipamide biaxially stretched film at 135°C as a measure of dimensional stability on the horizontal axis.
It is a graph in which the shrinkage rate in hot water during immersion in hot water for -10 minutes is plotted, and the amount of sagging is plotted on the vertical axis.
この図かられかるように、熱水収縮率を小−さくするに
したがってたるみ量が増える。たるみ量は第２図に示し
た装置によシ測定する。すなわち、１３００■扉隔てて
平行においた２本のロール間にフィルムを張）、フィル
ムの両端に幅１０１１１当り１０ｇ！の荷重をかける。As can be seen from this figure, as the hot water shrinkage rate is reduced, the amount of slack increases. The amount of slack is measured using the device shown in FIG. In other words, 1300cm film stretched between two rolls placed parallel to each other with a door apart), 10g per width 10111 on both ends of the film! Apply a load of
このとき、ロールから６５ Ｑ ａｌｌ離れ喪位置で、
フィルムの巾方向にわたって、水平面からのフィルムの
垂下距離を測定し、その差の最大値をもってたるみ量と
する。ポリアミド２軸延伸フイルムのたるみは、通常、
フィルム端部がたるむ、いわゆる端たるみ現象となる。At this time, 65 Q all away from the roll in the mourning position,
The hanging distance of the film from the horizontal plane is measured across the width of the film, and the maximum value of the difference is taken as the amount of slack. The sagging of polyamide biaxially stretched film is usually
The edges of the film sag, a so-called edge sagging phenomenon.
この端たるみは２０１１ｍ以下、好ましくは１０１１１
以下であれば問題ないが、２０１１を超えると、前述し
たように二次加工工程で支障をきたし好ましくない。一
方、ハイレトルト食品包装用としては、熱水収縮率が５
チを超えると、ハイレトルト処理により袋の収縮率が大
きくなり好ましくない。This end sag is 2011m or less, preferably 10111m
There is no problem if it is less than 2011, but if it exceeds 2011, it causes problems in the secondary processing process as described above, which is not preferable. On the other hand, for high retort food packaging, the hot water shrinkage rate is 5.
If it exceeds 1, the shrinkage rate of the bag increases due to high retort treatment, which is not preferable.
従来、延伸フィルムの平面性改良方法については数多く
提案されている。例えば特公昭４６−１１９９７には、
ポリアミドフィルムの延伸、熱固定に先立って、未延伸
フィルムを縦方向に１〜１５−伸長させながら、２〜１
０重量％吸水させる方法が提案されている。この方法の
狙いは、たるみは縦方向の伸びむらに起因するものであ
り、縦方向の延伸むらを改善するため、予備延伸で縦方
向を伸びにくくするものである。しかしながら、寸法安
定性良好フィルムを得る場合、熱固定工程でたるみが発
生するため、この方法では満足のいく平面性良好フィル
ムは得られない。Conventionally, many methods for improving the flatness of stretched films have been proposed. For example, in the Special Publication Publication No. 46-11997,
Prior to stretching and heat setting of the polyamide film, while stretching the unstretched film in the longitudinal direction by 1 to 15 minutes,
A method of absorbing 0% by weight of water has been proposed. The aim of this method is that sagging is caused by uneven stretching in the longitudinal direction, and in order to improve the uneven stretching in the longitudinal direction, preliminary stretching makes it difficult to stretch in the longitudinal direction. However, when obtaining a film with good dimensional stability, a film with satisfactory flatness cannot be obtained by this method because sagging occurs during the heat setting process.
また特公昭５０−２４３５３には、熱同定後の冷却方法
として、熱固定温度の８０〜４０チまで冷却する方法が
提案されているが、ポリアミドフィルムに対してはほと
んど効果がない。さらに特開昭５１−９１９７３には、
熱固定時の加熱空気量を変化させて、幅方向の物理的性
質（ボーイング）を改良する方法が提案されているが、
ポリアミドフィルムのボーイング、たるみ解消に対して
は効果がない。Further, Japanese Patent Publication No. 50-24353 proposes a method of cooling to a heat setting temperature of 80 to 40 degrees as a cooling method after heat setting, but this method is hardly effective for polyamide films. Furthermore, in JP-A-51-91973,
A method has been proposed to improve the physical properties in the width direction (bowing) by changing the amount of heated air during heat setting.
It is not effective in eliminating bowing and sagging of polyamide film.
本発明は、既存技術の欠点を十分検討した上で、寸法安
定性に優れ、平面性良好なポリアミド延伸フィルムの製
造方法を提供するものである。The present invention provides a method for producing a stretched polyamide film having excellent dimensional stability and good flatness, after fully examining the shortcomings of existing techniques.
本発明は、延伸に引き続いて熱固定した実質的に線状ポ
リアミドよシなる延伸フィルムを、９０℃以上１５０℃
以下の水蒸気中で、縦方向に０６５ｋｌｉ！／諺謝１以
上ｓ ＋ ０．０４ （ｔｍ −Ｔ ） ＊／−以下〔
↑ｍ：延伸フィルムの融点（℃） 、Ｔ ：水蒸気温度
（℃）〕の張力をかけて、連続的に処理することを特徴
とし、また、前記処理後、１５０℃以上ポリアミド延伸
フィルムの融点以下の温度の不活性ガス中で乾燥するこ
とを特徴とする、寸法安定性に優れ、平面性良好なポリ
アミド延伸フィルムを製造する方法である。In the present invention, a stretched film made of substantially linear polyamide that is heat-set after stretching is heated at a temperature of 90°C or more to 150°C.
065 kli in the vertical direction in the following water vapor! / proverb 1 or more s + 0.04 (tm -T ) */- or less [
↑ m: melting point of the stretched film (°C), T: water vapor temperature (°C)] The process is performed continuously under a tension of 150°C or more and below the melting point of the polyamide stretched film after the treatment This is a method for producing a polyamide stretched film with excellent dimensional stability and good flatness, which is characterized by drying in an inert gas at a temperature of .
次に、本発明の方法について詳細に述べる。Next, the method of the present invention will be described in detail.
まず、本発明に用いられる線状ポリアミドは、ポリへキ
サメチレンア？ノくミド、ポリカプラミド、ポリへキサ
メチレンセバカミド、ポリ−１１−７ミノウンデカンア
ミド、ポリラフリンアミドおよびそれらの共重合体、混
合体等であり、実質的にその性質を損わない範囲で各種
の添加剤等を添加することは何らさしつかえ表い。First, the linear polyamide used in the present invention is polyhexamethylene acetate. Nokumid, polycapramide, polyhexamethylene sebamide, poly-11-7minoundecanamide, polyloughrinamide, copolymers and mixtures thereof, etc., within the range that does not substantially impair their properties. There is no prohibition on adding various additives, etc.
これらのポリアミドは、延伸に先立って、Ｔダイ、サー
キュラ−ダイ等を用いる溶融製膜法によって、実質的に
無定形のフィルムに製膜する。次に、通常用いられる例
えば、ロール方式、チューブラ一方式、テンタ一方式延
伸機等で、延伸温度６０〜１８０℃で少なくとも一方向
に２．５〜４．５倍延伸する。延伸したフィルムは、寸
法安定性を付与するために熱固定を行なう。熱固定は通
常、フィルムの両端をクリップで把持し、緊張下で１５
０℃以上ポリアミド延伸フィルムの融点以下の温度の加
熱オープン中を走行させることにより行なう。このよう
にして延伸、熱固定したポリアミド延伸フィルムは、熱
固定温度を高くするほど寸法安定性は向上するが、一方
、平面性の悪化、特に端たるみの発生が顕著となる。Prior to stretching, these polyamides are formed into a substantially amorphous film by a melt film forming method using a T-die, a circular die, or the like. Next, the film is stretched 2.5 to 4.5 times in at least one direction at a stretching temperature of 60 to 180° C. using a commonly used stretching machine such as a roll type, tubular one type, or tenter type stretching machine. The stretched film is heat set to provide dimensional stability. Heat setting is usually done by holding both ends of the film with clips and holding it under tension for 15 minutes.
This is carried out by running the film under heating at a temperature of 0° C. or higher and lower than the melting point of the stretched polyamide film. The polyamide stretched film stretched and heat-set in this manner improves in dimensional stability as the heat-setting temperature increases, but on the other hand, the flatness deteriorates, particularly the occurrence of edge sagging becomes more noticeable.
本発明者らは、このたるみ現象について鋭意研究し、そ
のメカニズムを究明することによって本発明に到達した
。The present inventors have diligently studied this sagging phenomenon and have arrived at the present invention by investigating its mechanism.
すなわち、ポリアミド延伸フィルムのたるみは、熱固定
によるフィルム自身の伸びの不均一性によって発生する
。熱固定による伸びの不均一性は、配向度の異方性によ
って発生する。配向度の異方性は、熱同定によシ、中央
部に比べて端部の異方性が大きくなるため、縦方向の配
向度を比較すると、中央部よシも端部の方が高くな石。That is, the sagging of the polyamide stretched film is caused by non-uniform elongation of the film itself due to heat setting. Non-uniformity in elongation due to heat setting is caused by anisotropy in the degree of orientation. The anisotropy of the degree of orientation is affected by thermal identification, and the anisotropy is greater at the edges than at the center, so when comparing the degree of orientation in the longitudinal direction, the degree of orientation is higher at the edges than at the center. A stone.
その結果、端部がより伸びてたるむ。なお、熱固定によ
シ、中央部に比べて端部の配向度の異方性が大きくなる
現象は、一般にボーイングと呼ばれる。As a result, the ends become more stretched and sagging. Note that the phenomenon in which the degree of orientation anisotropy at the ends becomes larger than that at the center due to heat fixation is generally called bowing.
したがって、ポリアミド延伸フィルムのたるみを発生さ
せカいためには、ポリアミド延伸フィルムの熱固定によ
る伸びを発生させないか、または熱固定による端部の配
向度の異方性増大を押えるしかない。しかし、いずれも
熱固定により、本質的に発生する問題であシ、避ゆられ
ない。ポリアミド延伸フィルムのたるみ防止に対して、
既存技術が効果がないのは、上述したようなメカニズム
による。Therefore, in order to prevent the polyamide stretched film from sagging, it is necessary to prevent the stretched polyamide film from elongating due to heat setting, or to suppress the increase in anisotropy in the degree of orientation of the edges due to heat setting. However, both problems are inherently caused by heat fixation and cannot be avoided. For preventing sagging of polyamide stretched film,
The reason why existing technologies are ineffective is due to the mechanism described above.
本発明者らは、上述したようなポリアミド延伸フィルム
のたるみのメカニズムを究明した上で、従来技術にない
新規な方法を見出したものである。The present inventors have investigated the mechanism of sagging of polyamide stretched films as described above, and have discovered a novel method not found in the prior art.
す々わち、延伸に引き続いて熱固定した実質的に線上ポ
リアミドよりなる延伸フィルムを、９０℃以上１５０１
：以下の水蒸気中で、縦方向に０．３５ゆ／諺ｌ！以上
３ 十０．０４ （Ｔｍ −Ｔ ） ｋｇ／ｗｍ２以下
の張力をかけて、連続的に処理することにより、たるみ
を解消し、さらにその後、１５０℃以上ポリアミド延伸
フィルムの融点以下の温度の不活性ガス中に通し、乾燥
することによって、寸法安定性に優れ、平面性良好なポ
リアミド延伸フィルムを製造することができたのである
。That is, a stretched film made of substantially linear polyamide that has been heat-set after stretching is heated at 90°C or higher at 150°C.
: 0.35 Yu/l in the vertical direction in the following water vapor! By continuously applying a tension of 30.04 (Tm - T ) kg/wm2 or less, the sagging is eliminated, and after that, the sag is removed at a temperature of 150°C or higher and lower than the melting point of the polyamide stretched film. By passing it through an active gas and drying it, it was possible to produce a polyamide stretched film with excellent dimensional stability and good flatness.
水蒸気処理は、例えばフィルムの出入口を水蒸気噴出シ
ールしたチャンバーにより行なう。縦方向の張力は、フ
ィルムに加える縦方向の引張り力（ｋｇ）をフィルムの
幅（龍）×厚さく１箇）で除した値である。The steam treatment is carried out, for example, in a chamber in which the entrance and exit of the film are sealed to eject steam. The longitudinal tension is the value obtained by dividing the longitudinal tensile force (kg) applied to the film by the width (dragon) of the film x thickness (1 piece).
本発明の重要な特徴は、ポリアミド延伸フィルムを９０
℃以上１５０℃以下の水蒸気中で、縦方向に０．５に９
／龍を以上３ ＋ ０．０４ （Ｔｍ −Ｔ ） ｋｇ
７ａｍ”以下の張力をかけて、連続的に処理することに
ある。水蒸気に通すことによって、ポリアミド延伸フィ
ルムを加湿し、フィルムの二次転移温度を下げ、分子鎖
を動きやすくする。同時に縦方向に０．５ｋｇ／ａｍ”
以上５−４−ｏ、ｏ ４ （Ｔｍ−Ｔ ）ｋｌＩ／麿が
以下の張力をかけることによって、フィルムの縦方向の
配向度を全幅にわたって等しくシ、たるみを解消するこ
とができる。An important feature of the present invention is that the polyamide stretched film is
0.5 to 9 in the longitudinal direction in water vapor at a temperature above 150°C
/ more than 3 + 0.04 (Tm - T) kg
The purpose is to continuously process the polyamide stretched film under a tension of 7 am" or less. By passing it through water vapor, the stretched polyamide film is humidified, lowering the film's secondary transition temperature and making the molecular chains more mobile. At the same time, it 0.5kg/am”
By applying the following tension to 5-4-o, o 4 (Tm-T)klI/maro, the degree of orientation in the longitudinal direction of the film can be made uniform over the entire width, and sagging can be eliminated.
水蒸気は、加湿効果を上ける点で、飽和状態または飽和
状態に近いものが好ましい。飽和状態に近い水蒸気とし
ては、５〜１０℃過熱したものが好ましく、少量の空気
成分を含んだものであってもよい。これらの飽和点外に
保持した水蒸気の場合、フィルムを通すことによシ、水
蒸気の全部または一部が冷却されて飽和状態が達成され
る。また、別の水蒸気として、水蒸気の一部が凝縮し、
液滴状態となったものでもよい。さらに１００℃以下の
水蒸気の場合、水蒸気圧が１ ａｔｍに満たないので、
その分またはそれよりわずかに多く空気成分を含んだも
のであってもよい。The water vapor is preferably saturated or nearly saturated in order to improve the humidifying effect. The steam that is close to a saturated state is preferably one that has been superheated by 5 to 10°C, and may contain a small amount of air component. For water vapor held outside these saturation points, passing through the film cools all or part of the water vapor to achieve saturation. Also, some of the water vapor condenses as another water vapor,
It may be in the form of droplets. Furthermore, in the case of water vapor below 100°C, the water vapor pressure is less than 1 atm, so
It may contain an air component equal to or slightly more than that amount.
水蒸気温度が１５０℃以上では、飽和水蒸気圧が約５
ａｔｍ以上となり、実用上蒸気シールが困難となり使用
できない。また９０℃以下では、たるみ解消効果がない
。特に好ましい水蒸気温度Ｆｉ９５〜１１０℃である。When the water vapor temperature is 150°C or higher, the saturated water vapor pressure is approximately 5
ATM or higher, it is difficult to seal the steam in practice and it cannot be used. Further, at temperatures below 90°C, there is no effect of eliminating slack. A particularly preferable water vapor temperature Fi is 95 to 110°C.
縦方向の張力が０．５ ｋｇ／ｗ、ｍ２より小さいと、
フィルムの縦方向の配向度を等しくすることができず、
たるみ解消効果が出ない。またｓ −１−ｏ、ｏ ４（
Ｔｍ−Ｔ ）ｋｇ／ｌ１１１”を超えると、フィルムの
縦方向の配向度が高くなシすぎ、縦、横の配向度の異方
性が顕著となり好ましくない。特に好ましい張力の範囲
Ｆｉｏ、ｓｋｇ／ｗｍ” 〜２，５−）−０，０２（Ｔ
ｍ −、Ｔ ）ｋｇ／ｗｍ驚である。If the longitudinal tension is less than 0.5 kg/w, m2,
The degree of orientation in the longitudinal direction of the film cannot be made equal,
There is no sagging effect. Also, s -1-o, o 4(
If Tm-T )kg/l exceeds 111", the degree of orientation in the longitudinal direction of the film will be too high, and anisotropy in the degree of orientation in the longitudinal and lateral directions will become noticeable, which is undesirable. Particularly preferable tension ranges Fio, skg/l wm" ~2,5-)-0,02(T
m −, T ) kg/wm is surprising.
水蒸気処理時間は２〜３−０秒、好ましくｔ１５〜１５
秒である。Steam treatment time is 2-3-0 seconds, preferably t15-15
Seconds.
水蒸気処理後のポリアミド延伸フィルムは、たるみのな
いフィルムである。しかし、加湿処理であるため、通常
の状態に比べて湿っている。この湿りは、フィルムの取
扱作業性を悪化させたり、その後の水分率変化に伴う物
理的性質の変動の原因となる。このため用途が制限され
る。The stretched polyamide film after steam treatment is a film without sagging. However, since it is a humidification process, it is wetter than in normal conditions. This moisture deteriorates the handling efficiency of the film and causes changes in physical properties due to subsequent changes in moisture content. This limits its uses.
ポリアミド延伸フィルムの用途を拡げるため、水蒸気処
理後のフィルムを乾燥する。本発明においては、不活性
ガス中で乾燥する。すなわち、１５０℃以上ポリアミド
延伸フィルムの融点以下の温度の不活性ガス中にフィル
ムを通すことにより乾燥する。不活性ガスを加熱媒体と
する理由は、ポリアミド延伸フィルムの劣化を押えるた
めである。In order to expand the uses of polyamide stretched film, the film is dried after steam treatment. In the present invention, drying is performed in an inert gas. That is, the film is dried by passing it through an inert gas at a temperature of 150°C or higher and lower than the melting point of the stretched polyamide film. The reason why an inert gas is used as the heating medium is to suppress deterioration of the stretched polyamide film.
不活性ガスとしては、窒素、過熱水蒸気、燃焼ガス等を
用いる。不活性ガスには少量の酸素が含まれていてもさ
しつかえない。その割合蝶、好ましくは１０容量チ以下
、よシ好ましくｔｉｓ容量−以下である。As the inert gas, nitrogen, superheated steam, combustion gas, etc. are used. The inert gas may contain a small amount of oxygen. The proportion is preferably less than 10 volumes, more preferably less than 10 volumes.
このように延伸に引き続き熱固定したポリアミド延伸フ
ィルムを、９０℃以上１５０℃以下の水（Ｔｍ−Ｔ）ｋ
ｙ／■冒！以下の張力をかけて、連続的に処理し、その
後、１５０℃以上ポリアミド延伸フィルムの融点以下の
温度の不活性ガス中で乾燥することによって、たるみを
解消し、平面性に優れたフィルムを製造することができ
る。The polyamide stretched film heat-set after stretching in this way is heated in water (Tm-T)k at a temperature of 90°C to 150°C.
y/■ adventure! The film is processed continuously under the following tension, and then dried in an inert gas at a temperature of 150°C or higher and lower than the melting point of the stretched polyamide film to eliminate sagging and produce a film with excellent flatness. can do.
次に、本発明を実施例により具体的に説明する。Next, the present invention will be specifically explained using examples.
実施例
縦、横それぞれ３倍に延伸したポリヘキサメチレンアジ
パミド２軸延伸フイルムをクリップで両端を把持して、
２４０℃の加熱オーブンに通し、緊張下で熱同定した。Example A polyhexamethylene adipamide biaxially stretched film stretched 3 times vertically and horizontally was held at both ends with clips.
It was passed through a heating oven at 240°C and thermally identified under tension.
熱固定後のフィルムは、厚さ１５μ、幅８００１１ｍで
、平均熱水収縮率が５．５優であり、第３図Ａに示すよ
うに、たるみが４５關であった。この延伸フィルムを１
０５℃、ｊａｔｍの水蒸気チャンバーに通し、縦方向に
１．８ ｋｙ／ｓｍ”の張力をかけて、連続処理した。The film after heat setting had a thickness of 15 μm, a width of 80011 m, an average hot water shrinkage rate of 5.5 mm, and a sag of 45 mm as shown in FIG. 3A. This stretched film is 1
The sample was passed through a JATM water vapor chamber at 05° C. and subjected to continuous treatment under a longitudinal tension of 1.8 ky/sm.
なお、延伸フィルムの融点は２６０℃である。得られた
フィルムのたるみは、第３図Ｂに示すように８１１１で
あり、処理前に比べて明らかに減少した。Note that the melting point of the stretched film is 260°C. The sag of the obtained film was 8111 as shown in FIG. 3B, which was clearly reduced compared to before treatment.
たるみの要因である配向度のアンパラ／ス度合を、熱水
収縮率を尺度として測定したところ、水蒸気処理前は、
第４図Ａに示すように、中央部に比べて端部の配向度の
異方性が大きく、縦方向について配向度を比較すると、
中央部より端部の方が大きい。水蒸気処理後は、第４図
Ｂに示すように、中央部と端部の配向度がほぼ等しくな
っており、このことからも水蒸気処理が、たるみ解消に
対して明らかに効果があることが確認され−た。When we measured the unparalleled degree of orientation, which is a factor of sagging, using the hot water shrinkage rate as a scale, we found that before steam treatment,
As shown in FIG. 4A, the anisotropy of the degree of orientation at the ends is greater than that at the center, and when the degrees of orientation are compared in the longitudinal direction,
The edges are larger than the center. After steam treatment, as shown in Figure 4B, the degree of orientation in the center and edges is almost equal, which confirms that steam treatment is clearly effective in eliminating sagging. It was done.
さらに、前記のフィルムを１８０℃の過熱水蒸気中で３
秒間処理したところ、水分率は１チに減少しく乾燥前６
ｔｓ）、平面性良好なフィルムが得られた。Furthermore, the above film was heated in superheated steam at 180°C for 3 hours.
When treated for seconds, the moisture content decreased to 1%, and the moisture content decreased to 6% before drying.
ts), a film with good flatness was obtained.
第１図はポリヘキサメチレンアジパミド２軸延伸フイル
ムの熱収縮率とたるみ量の関係を示すグラフ、第２図は
たるみ測定装置の説明図、第３図は実施例におけるポリ
ヘキサメチレンアジパミド２軸！伸フイルムのたるみ量
を示すグラフ、第４図は同熱水収縮率を示すグラフであ
る。
第１図
（
熱太賦縮牢（％）Fig. 1 is a graph showing the relationship between heat shrinkage rate and sag amount of polyhexamethylene adipamide biaxially stretched film, Fig. 2 is an explanatory diagram of the sag measuring device, and Fig. 3 is a graph showing the relationship between polyhexamethylene adipamide biaxially stretched film and sag amount. Mid 2 axis! FIG. 4 is a graph showing the amount of slack of the stretched film, and FIG. 4 is a graph showing the shrinkage rate in hot water. Figure 1 ( Heat reduction (%)
Claims (1)
ドよシミる延伸フィルムを、９０℃以上１５０℃以下の
水蒸気中で、縦方向に０．５ ｋ４１７ａｍ”以上５
＋ ０．０４ （Ｔｍ−’ｒ ） ｋｃＩｉ／ｕ”以下
の張力をかけて、連続的に処理することを特徴とするポ
リアミド延伸フィルムの平面性改良方法。 （２）延伸に引き続いて熱固定した実質的に線状ポリア
ミドよりなる延伸フィルムを、９０℃以上１５０℃以下
の水蒸気中で、縦方向に０．５ ｋｇ／ｍ”以上５ ＋
０．０４ （Ｔｍ −Ｔ ）ｋｇ／關”以下の張力をか
けて、連続的に処理し、その後、１５０℃以上ポリアミ
ド嬌伸フ延伸フィルム以下の温度の不活性ガス中で乾燥
することを特徴とするポリアミド延伸フィルムの平面性
改良方法。[Scope of Claims] ... A stretched film that stains like a substantially linear polyamide, which has been heat-set after stretching, is stretched to a length of 0.5 k417 am" or more in the longitudinal direction in water vapor at a temperature of 90° C. or higher and 150° C. or lower.
+ 0.04 (Tm-'r)kcIi/u" or less tension and continuous treatment. (2) Stretching followed by heat setting. A stretched film substantially made of linear polyamide is heated at a rate of 0.5 kg/m" or more in the longitudinal direction in water vapor at a temperature of 90°C or higher and 150°C or lower.
It is characterized by being continuously treated under a tension of 0.04 (Tm - T ) kg/cm or less, and then dried in an inert gas at a temperature of 150°C or higher and lower than a stretched polyamide stretched film. A method for improving the flatness of a stretched polyamide film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15379781A JPS5855221A (en) | 1981-09-30 | 1981-09-30 | Flatness inprovement in drawn polyamide film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15379781A JPS5855221A (en) | 1981-09-30 | 1981-09-30 | Flatness inprovement in drawn polyamide film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5855221A true JPS5855221A (en) | 1983-04-01 |
Family
ID=15570333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15379781A Pending JPS5855221A (en) | 1981-09-30 | 1981-09-30 | Flatness inprovement in drawn polyamide film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5855221A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423630A2 (en) * | 1989-10-16 | 1991-04-24 | Toyo Boseki Kabushiki Kaisha | A thermoplastic resin film and a method for producing the same |
| US5440361A (en) * | 1993-09-03 | 1995-08-08 | The Walt Disney Company | Method for flattening acetate-based films using steam |
| JP2010107949A (en) * | 2008-09-30 | 2010-05-13 | Fujifilm Corp | Method and apparatus for manufacturing retardation film |
-
1981
- 1981-09-30 JP JP15379781A patent/JPS5855221A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423630A2 (en) * | 1989-10-16 | 1991-04-24 | Toyo Boseki Kabushiki Kaisha | A thermoplastic resin film and a method for producing the same |
| US5411695A (en) * | 1989-10-16 | 1995-05-02 | Toyo Boseki Kabushiki Kaisha | Thermoplastic resin film and a method for producing the same |
| US5574119A (en) * | 1989-10-16 | 1996-11-12 | Toyo Boseki Kabushiki Kaisha | Thermoplastic resin film and a method for producing the same |
| US5440361A (en) * | 1993-09-03 | 1995-08-08 | The Walt Disney Company | Method for flattening acetate-based films using steam |
| JP2010107949A (en) * | 2008-09-30 | 2010-05-13 | Fujifilm Corp | Method and apparatus for manufacturing retardation film |
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