JP2007069523A - Manufacturing method of biaxially stretched polyester film for twist wrapping - Google Patents
Manufacturing method of biaxially stretched polyester film for twist wrapping Download PDFInfo
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Abstract
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本発明は、ヒネリ包装用二軸延伸ポリエステルフィルムに関し、さらに詳細には、製膜性と厚みの均一性に優れ、かつ優れたヒネリ適性を有する二軸延伸ポリエステルフィルムに関する。 TECHNICAL FIELD The present invention relates to a biaxially stretched polyester film for shining packaging, and more particularly, to a biaxially stretched polyester film having excellent film forming properties and uniformity in thickness, and having excellent heliness aptitude.
ヒネリ適性の優れたフィルムとして、透明性がよいセロハンが広く使用されてきた。しかしながら、セロハンは吸湿性を有するため特性が季節により変動し、一定の品質のものを常に供給することが困難であり、かつ厚みの不均一性に起因する加工性の悪さが欠点とされてきた。一方、ポリエチレンテレフタレートフィルムは強靱性、耐熱性、耐水性、透明性等の優れた特性の良さがある反面、ヒネリ適性が劣るためにヒネリ包装用に用いることができないという欠点があった。 Cellophane, which has good transparency, has been widely used as a film having excellent suitability. However, since cellophane has hygroscopicity, its characteristics fluctuate depending on the season, it is difficult to always supply a certain quality, and poor workability due to uneven thickness has been a drawback. . On the other hand, the polyethylene terephthalate film has excellent properties such as toughness, heat resistance, water resistance, and transparency, but has a disadvantage that it cannot be used for wrapping due to its poor heelability.
かかる欠点を解消する方法として、共重合ポリエステルを二軸延伸した後、比較的高温（１４０〜２３５℃、好ましくは１５０〜２３０℃）で緊張熱処理を行い、配向度を低減させた（未延伸フィルムの平均屈折率をＮ0、二軸延伸フィルムの平均屈折率をＮ1とした時、０．００３≦Ｎ1−Ｎ0≦０．０２１を満足させた）ポリエステルフィルムが開示されている。（例えば、特許文献１参照）。また、ポリエチレンテレフタレートと３５℃以上のガラス転移温度を有するポリエステルと３４℃以下のガラス転移温度を有するポリエステルからなる混合ポリエステルを二軸延伸した後、比較的高温（２１０〜２２０℃）で緊張熱処理した下降伏点応力／上降伏点応力の比が０．９５以下のポリエステルフィルムが開示されている。（例えば、特許文献２参照）。 As a method for eliminating such drawbacks, the copolyester was biaxially stretched and then subjected to tension heat treatment at a relatively high temperature (140 to 235 ° C., preferably 150 to 230 ° C.) to reduce the degree of orientation (unstretched film). the average refractive index of the N 0, when the average refractive index of biaxially oriented film was N 1, was satisfied 0.003 ≦ N 1 -N 0 ≦ 0.021 ) polyester film is disclosed. (For example, refer to Patent Document 1). In addition, a mixed polyester composed of polyethylene terephthalate, a polyester having a glass transition temperature of 35 ° C. or higher and a polyester having a glass transition temperature of 34 ° C. or lower is biaxially stretched, and then subjected to a tension heat treatment at a relatively high temperature (210 to 220 ° C.). A polyester film having a ratio of falling yield stress / upper yield stress of 0.95 or less is disclosed. (For example, refer to Patent Document 2).
しかしながら、これらのポリエステルフィルムはヒネリ適性には優れているが、比較的高温で緊張熱処理を行うため、厚みの均一性がよくなく、その結果、印刷や蒸着等の加工工程でシワが発生しやすいという欠点があった。 However, although these polyester films are excellent in the suitability, since the tension heat treatment is performed at a relatively high temperature, the thickness uniformity is not good, and as a result, wrinkles are likely to occur in processing steps such as printing and vapor deposition. There was a drawback.
かかる欠点を解消する方法として、ポリエチレンテレフタレートを二軸延伸しただけの結晶化度が４０％以下のポリエステルフィルムが開示されている。（例えば、特許文献３参照）。 As a method for eliminating such drawbacks, a polyester film having a crystallinity of 40% or less obtained by biaxially stretching polyethylene terephthalate is disclosed. (For example, refer to Patent Document 3).
しかしながら、該ポリエステルフィルムはヒネリ適性と厚みの均一性に優れているが、二軸延伸後にタルミが発生しやすく、二軸延伸後にフィルムの両端を切断する際、または製品ロールに仕上げるために裁断する際に破断しやすく、かつ製品ロールに前記タルミに起因したシワが発生しやすいという欠点があり、いまだ満足されるものではなかった。
本発明は前記従来技術の問題点を解消することを目的とするものである。即ち、製膜性と厚みの均一性に優れ、かつ優れたヒネリ適性を有する二軸延伸ポリエステルフィルムを提供するものである。 The object of the present invention is to solve the problems of the prior art. That is, the present invention provides a biaxially stretched polyester film that is excellent in film formability and thickness uniformity and has excellent shininess suitability.
本願の発明は、エチレンテレフタレート成分を主体とするポリエステルとブチレンテレフタレート成分を主体とするポリエステルの混合比が１００：０〜５０：５０からなる混合ポリエステルの溶融樹脂を冷却固化したシートを横方向に第１段目延伸を行い、次いで縦方向に第２段目延伸を行い、さらに緊張下で熱処理を行い、かつ第２段目延伸倍率（Ｍ×（−））と緊張熱処理温度（Ｔ（℃））の積（Ｍ×・Ｔ）が２００〜６００である方法で製造されたヒネリ包装用二軸延伸ポリエステルフィルムであって、かつ応力−ひずみ曲線における降伏点応力差（上降伏点応力と下降伏点応力との差）の縦方向での値と横方向での値の平均値が２ＭＰａ以上であることを特徴とするヒネリ包装用二軸延伸ポリエステルフィルムである。 In the invention of the present application, a sheet obtained by cooling and solidifying a molten resin of a mixed polyester having a mixing ratio of 100: 0 to 50:50 of a polyester mainly composed of an ethylene terephthalate component and a polyester mainly composed of a butylene terephthalate component is The first stage is stretched, the second stage is then stretched in the machine direction, the heat treatment is performed under tension, and the second stage stretch ratio (M × (−)) and the tension heat treatment temperature (T (° C.)) ) Product (M × T) is a biaxially stretched polyester film produced by a method of 200 to 600, and the stress difference between the yield points (upper yield stress and lower yield stress) in the stress-strain curve A biaxially stretched polyester film for hinoki wrapping characterized in that the average value of the value in the vertical direction and the value in the horizontal direction (difference from point stress) is 2 MPa or more.
本発明のヒネリ包装用二軸延伸ポリエステルフィルムは、製膜性と厚みの均一性に優れ、かつ優れたヒネリ適性を有するため、極めて有用なポリエステルフィルムであるといえる。 The biaxially stretched polyester film for wrapping of the present invention is excellent in film forming property and uniformity in thickness, and has excellent heeling aptitude, so it can be said that it is an extremely useful polyester film.
本発明のポリエステルフィルムは、エチレンテレフタレート成分を主体とするポリエステルとブチレンテレフタレート成分を主体とするポリエステルの混合比が１００：０〜５０：５０からなる混合ポリエステルの溶融樹脂を冷却固化したシートを横方向に第１段目延伸を行い、次いで縦方向に第２段目延伸を行い、さらに緊張下で熱処理を行い、かつ第２段目延伸倍率（Ｍ×（−））と緊張熱処理温度（Ｔ（℃））の積（Ｍ×・Ｔ）が２００〜６００である方法で製造されたポリエステルフィルムであって、かつ応力−ひずみ曲線における降伏点応力差（上降伏点応力と下降伏点応力との差）の縦方向での値と横方向での値の平均値が２ＭＰａ以上であることを特徴とするポリエステルフィルムである。 The polyester film of the present invention is a sheet obtained by cooling and solidifying a molten resin of a mixed polyester having a mixing ratio of 100: 0 to 50:50 of a polyester mainly composed of an ethylene terephthalate component and a polyester mainly composed of a butylene terephthalate component. The first stage stretching is then performed, then the second stage stretching is performed in the longitudinal direction, and further heat treatment is performed under tension, and the second stage stretching ratio (M × (−)) and the tension heat treatment temperature (T ( ° C)) product (M × T) is a polyester film produced by a method of 200 to 600, and the stress difference between the yield point stress (the upper yield point stress and the lower yield point stress) in the stress-strain curve The polyester film is characterized in that the average value of the difference in the vertical direction and the value in the horizontal direction is 2 MPa or more.
本発明では、フィルムを構成するポリエステルは、エチレンテレフタレート成分を主体とするポリエステルとブチレンテレフタレート成分を主体とするポリエステルとの混合比が１００：０〜５０：５０であることが得られたフィルムにおいて降伏点応力差を発現させ、さらに耐熱性、耐水性、透明性等と良好な製膜性を確保する点から必要である。 In the present invention, the polyester constituting the film yields in a film in which the mixing ratio of the polyester mainly composed of the ethylene terephthalate component and the polyester mainly composed of the butylene terephthalate component is 100: 0 to 50:50. This is necessary from the viewpoint of exhibiting a point stress difference and further ensuring good film forming properties such as heat resistance, water resistance and transparency.
ブチレンテレフタレート成分を主体とするポリエステルが５０重量％を超える場合、降伏点応力差が発現しにくくなるばかりでなく、製膜性が悪くなるため好ましくない。 When the amount of the polyester having a butylene terephthalate component as a main component exceeds 50% by weight, not only the yield point stress difference is hardly exhibited but also the film forming property is deteriorated.
本発明では、フィルムを構成するポリエステルは、その目的を阻害しない範囲で他の共重合成分を含むことができる。使用できる他の共重合成分のうち、ジカルボン酸成分として、ナフタレンジカルボン酸、ジフェニルスルホンジカルボン酸、５−ナトリウムスルホイソフタル酸等の芳香族ジカルボン酸、シュウ酸，コハク酸，アジピン酸，セバシン酸，デカンジカルボン酸，マレイン酸，フマル酸，ダイマー酸等の脂肪族ジカルボン酸、ｐ−オキシ安息香酸等のオキシカルボン酸、シクロヘキサンジカルボン酸等の脂環族ジカルボン酸が使用できる。また、グリコール成分として、プロパンジオール、ペンタンジオール、ヘキサンジオール、ネオペンチルグリコール等の脂肪族グリコール、シクロヘキサンジメタノール等の脂環族グリコール、ビスフェノールＡのエチレンオキサイド付加物，ビスフェノールＳのエチレンオキサイド付加物等の芳香族グリコール、ポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレングリコール等が使用できる。このほか少量のアミド結合、ウレタン結合、エーテル結合、カーボネート結合等を含有する化合物を含んでいてもよい。 In this invention, the polyester which comprises a film can contain another copolymerization component in the range which does not inhibit the objective. Among other copolymerizable components that can be used, aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, diphenylsulfone dicarboxylic acid, 5-sodium sulfoisophthalic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, decane Aliphatic dicarboxylic acids such as dicarboxylic acid, maleic acid, fumaric acid and dimer acid, oxycarboxylic acids such as p-oxybenzoic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid can be used. In addition, as glycol components, aliphatic glycols such as propanediol, pentanediol, hexanediol and neopentylglycol, alicyclic glycols such as cyclohexanedimethanol, ethylene oxide adducts of bisphenol A, ethylene oxide adducts of bisphenol S, etc. Aromatic glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like can be used. In addition, a small amount of a compound containing an amide bond, a urethane bond, an ether bond, a carbonate bond, or the like may be included.
本発明では、公知の押出機で溶融押出したポリエステルを冷却固化したシートをポリエステルのガラス転移温度以上の温度で３．０〜４．５倍横方向に第１段目延伸を行い、次いで、ポリエステルのガラス転移温度以上の温度で２．０〜４．５倍縦方向に第２段目延伸を行い、さらに、公知の巾方向を一定長とした熱固定処理（例えば、フィルムの両端をクリップで把持して行う熱固定処理）を８０〜１３０℃で１〜２０秒間実施することが好ましい。 In the present invention, a sheet obtained by cooling and solidifying a polyester melt-extruded by a known extruder is subjected to first-stage stretching 3.0 to 4.5 times in the transverse direction at a temperature equal to or higher than the glass transition temperature of the polyester, 2nd stage stretching in the longitudinal direction 2.0 to 4.5 times at a temperature equal to or higher than the glass transition temperature of, and further, heat-fixing treatment with a certain length in the known width direction (for example, both ends of the film with clips It is preferable to carry out the heat setting treatment performed by gripping at 80 to 130 ° C. for 1 to 20 seconds.
本発明では、上記の製膜方法において、第２段目延伸倍率（Ｍ×（−））と熱固定温度（Ｔ（℃））の積（Ｍ×・Ｔ）を２００〜６００に制御することが製膜性と厚みの均一性を良化させ、かつ製品ロールの外観を良化させ、さらに得られたフィルムにおいて降伏点応力差を発現させるために必要である。Ｍ×・Ｔが２００未満の場合、得られたポリエステルフィルムの降伏点応力差は十分に発現するが、二軸延伸後にフィルムの両端を切断する際、または製品ロールに仕上げるために裁断する際に破断しやすく、かつ製品ロールに前記タルミに起因したシワが発生しやすいため好ましくない。逆に、Ｍ×・Ｔが６００を越える場合、製膜性と製品ロール外観には優れているが、得られたポリエステルフィルムの降伏点応力差が発現しにくくなるため好ましくない。 In the present invention, in the film forming method described above, the product (M × · T) of the second stage draw ratio (M × (−)) and the heat setting temperature (T (° C.)) is controlled to 200 to 600. However, it is necessary to improve the film formability and uniformity of thickness, improve the appearance of the product roll, and develop a yield point stress difference in the obtained film. When Mx · T is less than 200, the yield stress difference of the obtained polyester film is sufficiently developed, but when cutting both ends of the film after biaxial stretching or when cutting to finish into a product roll It is not preferable because it is easy to break and wrinkles due to the above-mentioned tarmi are likely to occur in the product roll. On the contrary, when M × T exceeds 600, the film forming property and the product roll appearance are excellent, but it is not preferable because the yield point stress difference of the obtained polyester film becomes difficult to express.
本発明では、第３段目延伸としてポリエステルのガラス転移温度以上の温度で１．０５〜１．４倍の再横延伸を行ってもよく、また、巾方向を一定長とした熱固定の後、巾方向に緩和処理（１００〜１４０℃で巾方向に０．５〜８％緩和させる処理）を行ってもよい。 In the present invention, as the third stage stretching, re-stretching of 1.05 to 1.4 times may be performed at a temperature equal to or higher than the glass transition temperature of the polyester. Further, relaxation treatment (treatment of relaxing 0.5 to 8% in the width direction at 100 to 140 ° C.) may be performed in the width direction.
本発明では、ポリエステルの極限粘度は、０．５ｄｌ／ｇ以上であることが好ましい。極限粘度が０．５ｄｌ／ｇ未満の場合、ポリエステルフィルムを製膜する際、破断が発生しやすく好ましくない。 In the present invention, the intrinsic viscosity of the polyester is preferably 0.5 dl / g or more. When the intrinsic viscosity is less than 0.5 dl / g, breakage tends to occur when forming a polyester film, which is not preferable.
本発明では、ポリエステルフィルムの厚みは９〜２５μｍであることが好ましい。ポリエステルフィルムの厚みが９μｍ未満の場合、得られたフィルムをヒネリ包装に用いた場合、フィルムの腰感が劣るため好ましくない。逆に、２５μｍを超える場合、得られたフィルムのヒネリ適性が劣るため好ましくない。 In this invention, it is preferable that the thickness of a polyester film is 9-25 micrometers. When the thickness of the polyester film is less than 9 μm, when the obtained film is used for the wrapping packaging, it is not preferable because the film feels poor. On the other hand, when the thickness exceeds 25 μm, the obtained film is inferior in the swellability, which is not preferable.
以下、実施例をもとに本発明を説明する。 Hereinafter, the present invention will be described based on examples.
実施例および比較例に用いた評価方法について説明する。
（１）降伏点応力差（Δσ（ＭＰａ））
ＪＩＳ Ｃ ２１５１により応力−ひずみ曲線を測定し（縦方向と横方向それぞれ５点）、縦方向と横方向の上降伏点応力と下降伏点応力の差（縦方向での値と横方向での値の平均値）を降伏点応力差とする。
（２）ポリエステルフィルムの厚みの均一性（ＴＶ（％））
ポリエステルフィルムの中央部から縦方向に巾４ｃｍ×長さ３ｍのフィルム片を切り出し、これを１ｍの長さに３分割したものを測定サンプルとする。該測定サンプルをアンリツ電気社製の連続厚み計（マイクロメーター：Ｋ３０６Ｃ、レコーダー：Ｋ３１０Ｃ）を用いて下記の条件で測定する。測定サンプル１ｍ内の（最大値−最小値）を求め，３個の平均値（ΔＴ平均）を算出する。次いで、平均厚み（Ｔ平均：連続厚み測定後のフィルム片を３枚重ねて一方の端部から５ｃｍのところを基準とし、５ｃｍピッチでダイアルゲージを用いて１８点測定し、１８点の厚みの合計値を５４で除した値）を算出する。次いで、ＴＶ＝（ΔＴ平均／Ｔ平均）×１００（％）を算出し、ＴＶが８％以下を実用性ありと評価する。
［連続厚みの測定条件］
フィルムの送り速度：１．５ｍ／分
マイクロメーターのスケール：±５μｍ
レコーダーのハイカット：５Ｈｚ
レコーダーのスケール：±２μｍ
レコーダーのチャート速度：２．５ｍｍ／秒
レコーダーの測定レンジ：×１
（３）ポリエステルの極限粘度
ポリエステル０．１ｇをフェノール／テトラクロロエタン（容積比で３／２）の混合溶媒２５ｍｌ中に溶解させ、３０℃でオストワルド粘度計を用いて測定する。
（４）ヒネリ適性
ポリエステルフィルムから１０ｃｍ×１０ｃｍのサンプル片を切りだし、直径２ｃｍの丸棒に５ｃｍはみ出すように、長手方向に巻き付ける。次いで、はみ出した部分を３６０°ひねり、３６０°から戻った角度を測定する（ｎ＝１００）。これらの平均値を求め、○を実用性ありと評価する。
○：ひねり戻り角度が７５°以下
△：ひねり戻り角度が７５〜８５°
×：ひねり戻り角度が８５°以上
The evaluation methods used in the examples and comparative examples will be described.
(1) Yield point stress difference (Δσ (MPa))
The stress-strain curve was measured according to JIS C 2151 (5 points each in the vertical and horizontal directions), and the difference between the upper and lower yield stresses in the vertical and horizontal directions (the value in the vertical direction and the value in the horizontal direction). (Average value) is the yield point stress difference.
(2) Uniformity of polyester film thickness (TV (%))
A piece of film having a width of 4 cm and a length of 3 m is cut out from the center of the polyester film in the vertical direction, and this is divided into three pieces each having a length of 1 m as a measurement sample. The measurement sample is measured under the following conditions using a continuous thickness meter (micrometer: K306C, recorder: K310C) manufactured by Anritsu Electric Co., Ltd. The (maximum value−minimum value) in the measurement sample 1m is obtained, and the average value of three (ΔT average) is calculated. Next, the average thickness (T average: three film pieces after continuous thickness measurement were stacked and measured at 18 points using a dial gauge at a 5 cm pitch on the basis of 5 cm from one end. The value obtained by dividing the total value by 54) is calculated. Next, TV = (ΔT average / T average) × 100 (%) is calculated, and TV is evaluated as practical if 8% or less.
[Conditions for continuous thickness measurement]
Film feed rate: 1.5 m / min Micrometer scale: ± 5 μm
Recorder high cut: 5Hz
Recorder scale: ± 2 μm
Recorder chart speed: 2.5 mm / sec Recorder measurement range: × 1
(3) Intrinsic viscosity of polyester 0.1 g of polyester is dissolved in 25 ml of a mixed solvent of phenol / tetrachloroethane (3/2 by volume) and measured at 30 ° C. using an Ostwald viscometer.
(4) Hinel suitability A 10 cm × 10 cm sample piece is cut out from the polyester film and wound in the longitudinal direction so as to protrude 5 cm from a round bar having a diameter of 2 cm. Next, the protruding portion is twisted 360 °, and the angle returned from 360 ° is measured (n = 100). The average value of these is obtained, and ○ is evaluated as practical.
○: Twist return angle is 75 ° or less △: Twist return angle is 75 to 85 °
×: Twist return angle is 85 ° or more
実施例および比較例に用いたポリエステル原料、製膜条件、Ｍ×・Ｔ、厚みの均一性、降伏点応力差、ヒネリ適性を表１に示す。
（１）Ａ：ポリエチレンテレフタレート（極限粘度：０．６２ｄｌ／ｇ、平均粒径：１．３μｍの凝集シリカを１０００ｐｐｍ配合）
（２）Ｂ：ポリエチレンテレフタレート・イソフタレート（エチレンイソフタレートの繰り返し単位１０モル％、極限粘度：０．６２ｄｌ／ｇ、平均粒径：１．３μｍの凝集シリカを１０００ｐｐｍ配合）
（３）Ｃ：ポリブチレンテレフタレート（極限粘度：１．２ｄｌ／ｇ）
Table 1 shows polyester raw materials, film forming conditions, M × T, thickness uniformity, yield point stress difference, and swellability used in Examples and Comparative Examples.
(1) A: Polyethylene terephthalate (Intrinsic viscosity: 0.62 dl / g, average particle diameter: 1.3 μm of agglomerated silica blended in 1000 ppm)
(2) B: Polyethylene terephthalate / isophthalate (containing 10 ppm of repeating unit of ethylene isophthalate, intrinsic viscosity: 0.62 dl / g, average particle size: 1.3 ppm of agglomerated silica of 1000 ppm)
(3) C: Polybutylene terephthalate (Intrinsic viscosity: 1.2 dl / g)
［実施例１］
ポリエステル原料としてＢとＣの混合物（Ｂ／Ｃ：７５／２５重量％）を、１２０℃で２４時間減圧乾燥（１．３ｈＰａ）し、単軸押出機を用いて２８０℃で溶融させた後、４５ｃｍ幅のＴダイより冷却ロール（周速５０ｍ／分）上へキャストして（冷却ロール周面に対向するように設置した直径が３０μｍのタングステンワイヤー電極から７．２ｋＶの電圧を印加し、０．２ｍＡの電流を流して静電密着させて）未延伸シートを得た。該未延伸シートをテンターで予熱温度９５℃、延伸温度９２℃で横方向に３．７倍延伸し（第１段目延伸）、予熱温度８０℃、延伸温度９５℃で縦方向に３．６倍延伸し（第２段目延伸）、さらに１００℃で１．０５倍再横延伸し（第３段目延伸）、その後１００℃で定長巾熱固定処理して厚さ１８μｍのポリエステルフィルムを得た。
本実施例の方法は、表１からわかるように、降伏点応力差が４ＭＰａであり、優れたヒネリ包装用二軸延伸ポリエステルフィルムであるといえる。
[Example 1]
A mixture of B and C (B / C: 75/25% by weight) as a polyester raw material was dried under reduced pressure (1.3 hPa) at 120 ° C. for 24 hours, and melted at 280 ° C. using a single screw extruder, Cast onto a cooling roll (peripheral speed 50 m / min) from a 45 cm wide T-die (applying a voltage of 7.2 kV from a tungsten wire electrode with a diameter of 30 μm placed so as to face the circumferential surface of the cooling roll, A non-stretched sheet was obtained by applying a current of 2 mA for electrostatic contact. The unstretched sheet was stretched 3.7 times in the transverse direction at a preheating temperature of 95 ° C. and a stretching temperature of 92 ° C. (first stage stretching), and preheated at 80 ° C. and stretched at 95 ° C. in the longitudinal direction of 3.6 °. The film was stretched twice (second-stage stretching), further re-stretched 1.05 times at 100 ° C. (third-stage stretching), and then heat-fixed at 100 ° C. to obtain a polyester film having a thickness of 18 μm. It was.
As can be seen from Table 1, the method of this example has a yield point stress difference of 4 MPa, and can be said to be an excellent biaxially stretched polyester film for velvet packaging.
［実施例２］
第２段目延伸倍率を４．２倍とし、定長巾熱固定処理温度を１２０℃とした以外は実施例１と同様にして厚さ１８μｍのポリエステルフィルムを得た。
本実施例の方法は、表１からわかるように、降伏点応力差が３ＭＰａであり、優れたヒネリ包装用二軸延伸ポリエステルフィルムであるといえる。
[Example 2]
A polyester film having a thickness of 18 μm was obtained in the same manner as in Example 1 except that the second stage draw ratio was 4.2 times and the constant length width heat setting treatment temperature was 120 ° C.
As can be seen from Table 1, the method of this example has a yield point stress difference of 3 MPa, and can be said to be an excellent biaxially stretched polyester film for velvet packaging.
［実施例３］
第２段目延伸倍率を３．０倍とした以外は実施例１と同様にして厚さ１８μｍのポリエステルフィルムを得た。
本実施例の方法は、表１からわかるように、降伏点応力差が５ＭＰａであり、優れたヒネリ包装用二軸延伸ポリエステルフィルムであるといえる。
[Example 3]
A polyester film having a thickness of 18 μm was obtained in the same manner as in Example 1 except that the second stage draw ratio was 3.0 times.
As can be seen from Table 1, the method of this example has a yield point stress difference of 5 MPa, and can be said to be an excellent biaxially stretched polyester film for velvet packaging.
［実施例４］
ポリエステル原料としてＡを用いた以外は実施例３と同様にして厚さ１８μｍのポリエステルフィルムを得た。
本実施例の方法は、表１からわかるように、降伏点応力差が３ＭＰａであり、優れたヒネリ包装用二軸延伸ポリエステルフィルムであるといえる。
[Example 4]
A polyester film having a thickness of 18 μm was obtained in the same manner as in Example 3 except that A was used as the polyester raw material.
As can be seen from Table 1, the method of this example has a yield point stress difference of 3 MPa, and can be said to be an excellent biaxially stretched polyester film for velvet packaging.
［比較例１］
定長巾熱固定処理温度を１７０℃とした以外は実施例１と同様にして厚さ１８μｍのポリエステルフィルムを得た。
この方法は、表１からわかるように、降伏点応力差が０ＭＰａ（降伏点がなく応力が増加するのみ）であり、ヒネリ適性が劣るため、ヒネリ包装用二軸延伸ポリエステルフィルムとして好ましくない。
[Comparative Example 1]
A polyester film having a thickness of 18 μm was obtained in the same manner as in Example 1 except that the constant length width heat fixing treatment temperature was set to 170 ° C.
As can be seen from Table 1, this method has a yield point stress difference of 0 MPa (no yield point and only increases the stress) and is inferior in the formability, and thus is not preferable as a biaxially stretched polyester film for wrapping.
［比較例２］
ポリエステル原料としてＢとＣの混合物（Ｂ／Ｃ：４０／６０重量％）とし、周速３０ｍ／分の冷却ロールへキャストした以外は実施例１と同様にして厚さ１８μｍのポリエステルフィルムを得た。
この方法は、表１からわかるように、降伏点応力差が１ＭＰａ未満（上降伏点は認められるが、明確な下降伏点が認められない）であり、ヒネリ適性が劣るため、ヒネリ包装用二軸延伸ポリエステルフィルムとして好ましくない。
[Comparative Example 2]
A polyester film having a thickness of 18 μm was obtained in the same manner as in Example 1 except that the polyester raw material was a mixture of B and C (B / C: 40/60 wt%) and cast to a cooling roll at a peripheral speed of 30 m / min. .
As can be seen from Table 1, this method has a yield point stress difference of less than 1 MPa (an upper yield point is recognized, but a clear lower yield point is not recognized), and is less suitable for heliness. It is not preferable as an axially stretched polyester film.
［比較例３］
ポリエステル原料としてＢとＣの混合物（Ｂ／Ｃ：２０／８０重量％）とし、周速３０ｍ／分の冷却ロールへキャストした以外は実施例１と同様にしてポリエステルフィルムを得ようとしたが、冷却ロールで冷却後にシートの両端部が割れることが多くポリエステルフィルムを安定して得られなかった。
この方法は、ヒネリ包装用二軸延伸ポリエステルフィルムとして好ましくない。
[Comparative Example 3]
A polyester film was obtained in the same manner as in Example 1 except that the polyester raw material was a mixture of B and C (B / C: 20/80% by weight) and cast to a cooling roll with a peripheral speed of 30 m / min. After cooling with a cooling roll, both ends of the sheet were often cracked, and a polyester film could not be obtained stably.
This method is not preferable as a biaxially stretched polyester film for shining packaging.
［比較例４］
定長巾熱固定処理温度を５０℃とした以外は実施例１と同様にしてポリエステルフィルムを得ようとしたが、熱固定処理後でフィルムのタルミが著しく、フィルムの両端を切断する際、フィルムが破断しやすいためポリエステルフィルムを安定して得られなかった。 この方法は、ヒネリ包装用二軸延伸ポリエステルフィルムとして好ましくない。
[Comparative Example 4]
A polyester film was obtained in the same manner as in Example 1 except that the fixed length width heat fixing treatment temperature was set to 50 ° C., but the film was severely damaged after the heat fixing treatment. A polyester film could not be stably obtained because it was easily broken. This method is not preferable as a biaxially stretched polyester film for shining packaging.
［比較例５］
第２段目延伸倍率を１．６倍とした以外は実施例１と同様にして厚さ１８μｍのポリエステルフィルムを得た。
この方法は、表１からわかるように、降伏点応力差が６ＭＰａであり、ヒネリ適性は良好であったが、厚みの均一性が悪いためヒネリ包装用二軸延伸ポリエステルフィルムとして好ましくない。
[Comparative Example 5]
A polyester film having a thickness of 18 μm was obtained in the same manner as in Example 1 except that the second stage draw ratio was 1.6 times.
As can be seen from Table 1, this method has a yield point stress difference of 6 MPa and good shining suitability, but is not preferable as a biaxially stretched polyester film for shining wrapping due to poor thickness uniformity.
本発明のポリエステルフィルムは、製膜性と製品ロールの外観に優れ、かつ得られたフィルムが十分な降伏点応力を有するためヒネリ適性に優れており、ヒネリ包装用二軸延伸ポリエステルフィルムとして極めて有用であるといえる。 The polyester film of the present invention is excellent in film formability and appearance of a product roll, and has excellent yield resistance because the obtained film has sufficient yield point stress, and is extremely useful as a biaxially stretched polyester film for hinelli packaging. You can say that.
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| JPS57102317A (en) * | 1980-12-16 | 1982-06-25 | Gunze Ltd | Polyester based film for twist wrapping |
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| EP2408850A4 (en) * | 2009-03-19 | 2015-10-21 | Skc Co Ltd | Heat-shrinkable polyester film and preparation method thereof |
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