KR100893721B1 - Twistable polyester films and processing method thereof - Google Patents
Twistable polyester films and processing method thereof Download PDFInfo
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Abstract
본 발명은 Heat Gradient를 사용하여 압력 0.2MPa, 1sec, 상온의 조건 하에서 필름을 반으로 접은 후 30분 후 접힌 부분의 각(θ)을 다음 수학식 1을 통해 계산하여 얻어진 꼬임도(twistability, θ)가 70°이하인 이축연신 폴리에스테르 필름을 제공하는 바, 이는 고유하게 우수한 기계적특성, 인쇄적성, 투명성, 두께균일성, 컷팅성, 무해성 등을 지니면서 꼬임성을 가져 사탕, 카라멜 또는 쵸콜렛 포장재와 같은 포장재로 유용하다. The present invention is a twist degree obtained by calculating the angle (θ) of the folded portion in 30 minutes after folding the film in half under conditions of pressure 0.2MPa, 1sec, room temperature using Heat Gradient through the following equation (1) A biaxially stretched polyester film having a) of 70 ° or less, which is inherently excellent in mechanical properties, printability, transparency, thickness uniformity, cutting property, harmlessness, etc. and has twisting properties such as candy, caramel or chocolate packaging material. Useful as a packaging material.
상기 식에서, F는 반으로 접혀진 필름 양끝 점간을 이은 가상 선의 길이이고, 2L은 접혀진 필름의 총 길이이다. Where F is the length of the imaginary line between the two ends of the film folded in half, and 2L is the total length of the folded film.
Description
도 1은 꼬임도의 계산방법을 보이기 위한 모식도이다. 1 is a schematic diagram for showing a method of calculating the twist degree.
<도면 주요 부호의 설명><Description of Drawing Major Symbols>
W- 필름의 폭, L- 반으로 접은 필름의 길이W- film width, L- half folded film length
F- 반으로 접힌 필름의 양끝점간을 이은 가상 선의 길이F- length of imaginary line between two ends of film folded in half
θ- 반으로 접힌 부분의 각, 꼬임도
θ- angle in half folded, degree of twist
본 발명은 꼬임성이 우수한 이축연신 폴리에스테르 필름 및 그 제조방법에 관한 것으로서, 기계적 특성, 인쇄적성, 투명성, 두께균일성, 컷팅성, 무해성 등이 우수한 폴리에스테르 이축연신 필름에 꼬임성을 부여하여 사탕, 쵸콜렛, 카라멜 등의 포장재로도 유용한 폴리에스테르 이축연신 필름과 이를 제조하는 방법에 관한 것이다. The present invention relates to a biaxially stretched polyester film having excellent twisting property and a method of manufacturing the same, and provides twisting property to a polyester biaxially stretched film having excellent mechanical properties, printability, transparency, thickness uniformity, cutting property, and harmlessness. The present invention relates to a polyester biaxially oriented film which is also useful as a packaging material for candy, chocolate, caramel and the like and a method of manufacturing the same.
현재 공업적으로 제조되고 있는 폴리에틸렌테레프탈레이트(PET) 성형품은 섬유, 필름 및 기타 성형품에 광범위하게 사용되고 있다. 특히 방향족 디카르복실산과 글리콜로부터 얻어지는 폴리에틸렌테레프탈레이트 필름은 우수한 내열성, 항장력(抗張力), 신도(伸度), 영율(young率), 탄성회복, 내충격성 등의 기계적 성질, 치수안정성, 전기절연성으로 자기기록테이프, 사진필름, 절연재료, 피증착필름 등의 산업자재용 및 농업재료용으로 널리 사용되고 있다. 또한, 내약품성, 내후성, 내수성 등의 화학적 성질, 투명성, 보향성(保香性), 내수성, 가스차단성 등이 우수하여 식품이나 기타 물품의 포장재료로도 그 사용량이 크게 증가하고 있다. Polyethylene terephthalate (PET) molded articles, which are currently produced industrially, are widely used in fibers, films and other molded articles. In particular, polyethylene terephthalate film obtained from aromatic dicarboxylic acid and glycol has excellent mechanical properties such as excellent heat resistance, tensile strength, elongation, Young's modulus, elastic recovery, impact resistance, dimensional stability, electrical insulation It is widely used for industrial materials and agricultural materials such as magnetic recording tapes, photographic films, insulating materials and films to be deposited. In addition, the chemical properties, such as chemical resistance, weather resistance, water resistance, transparency, preservation (protective smell), water resistance, gas barrier properties, etc. are excellent, so the amount of the packaging material of food and other items is increasing significantly.
통상 PET 필름의 공업적 제조방법은 PET 중합체를 용융압출하고 냉각드럼에서 냉각하여 비결정 시트를 제조한 후 연신, 열고정하여 2축연신 필름을 얻는다. 이때, PET 필름의 제조에 사용되는 PET 중합체의 공업적 제조방법으로는 보통 테레프탈산과 같은 디카르복실산과 에틸렌글리콜을 주성분으로 하여 상압 또는 가압 하에서 반응온도 200 내지 280℃로 가열시키는 직접 에스테르화 반응, 혹은 디메틸테레프탈레이트와 같은 디메틸카르복실레이트와 에틸렌글리콜과 같은 글리콜을 주성분으로 하여 촉재 존재 하에서 반응온도 140 내지 240℃로 가열시키는 에스테르 교환반응에 의해 얻어지는 주성분이 비스(β-하이드록시에틸)테레프탈레이트 및 이들의 저분자량 축합물(에스테르화물)을 얻고, 이를 연속해서 고진공 하에서 중축합촉매와 함께 반응온도 260 내지 300℃로 가열하여 중축합시키는 방법으로 제조하고 있다. In general, a method for producing a PET film is a melt-extruded PET polymer and cooled in a cooling drum to prepare an amorphous sheet, stretched, heat-set to obtain a biaxially stretched film. In this case, as an industrial production method of PET polymer used in the production of PET film, a direct esterification reaction is usually carried out at a reaction temperature of 200 to 280 ° C under atmospheric pressure or pressure, based on dicarboxylic acid such as terephthalic acid and ethylene glycol as main components, Alternatively, bis (β-hydroxyethyl) terephthalate is obtained by a transesterification reaction in which a dimethyl carboxylate such as dimethyl terephthalate and a glycol such as ethylene glycol are used as a main component and heated to a reaction temperature of 140 to 240 ° C. in the presence of a catalyst. And low molecular weight condensates thereof (esterified products), which are continuously produced under a high vacuum with a polycondensation catalyst at a reaction temperature of 260 to 300 ° C. to be polycondensed.
PET는 상기와 같은 우수한 물성으로 인해 공업적으로 큰 가치를 지니고 있는 것은 잘 알려져 있다. 그러나 일부 용도에서는 사용의 제한을 받고 있기도 하다. 특히 사탕, 카라멜, 쵸콜렛 등을 포장하는 필름의 경우 우수한 꼬임성, 높은 강성, 인쇄적성, 인체무해성, 컷팅성 등의 특성을 가져야 하나, PET의 경우 높은 복원력을 가짐으로 인해 꼬임성이 매우 약한 특성을 가진다.It is well known that PET is of great industrial value due to such excellent physical properties. However, some applications have restrictions on their use. In particular, the film packaging candy, caramel, chocolate, etc. should have characteristics such as excellent twisting property, high rigidity, printability, harmlessness and cutting property, but PET has very weak resilience due to its high resilience. Has characteristics.
이에 종래에는 사탕, 카라멜, 쵸콜렛 등의 포장 필름으로는 셀로판, OPS, PVC 필름 등과 같이 우수한 꼬임 특성을 갖는 것들을 주로 사용하여 왔다. Therefore, conventionally, packaging films such as candy, caramel, chocolate, etc. have mainly used those having excellent twisting properties such as cellophane, OPS, PVC film and the like.
그러나 PVC 필름의 경우 가소제에 의한 환경호르몬 문제와 소각시 다이옥신이 발생하는 등 문제가 있어 국가별/지역별로 환경규제의 대상이 되고 있는 상황으로, 국내에서도 일부 식품포장용도로는 사용규제품목으로 지정되고 있는 상황이다. OPS의 경우에는 두께의 균일성, 열적안정성(치수안정성), 기계적 강인성, 가공적성의 문제로 인해 그 사용이 제한적이다. 또한 셀로판의 경우 국내에서는 생산하는 업체가 없기 때문에 수입에 의존하고 있고, 셀로판 폴리머를 제조하는 공정이 공해산업으로 문제가 많이 발생되고 있다. 특히 그 가격이 높기 때문에 사용에 제한적이다. However, in the case of PVC film, there are problems such as environmental hormones caused by plasticizers and dioxin occurs during incineration, which is a target of environmental regulations by country and region. It is a situation. In the case of OPS, its use is limited due to the problems of thickness uniformity, thermal stability (dimension stability), mechanical toughness and processability. In addition, cellophane is dependent on imports because there are no companies producing in Korea, and the manufacturing process of cellophane polymer is causing a lot of problems to the pollution industry. In particular, its price is high, so its use is limited.
최근 공압출을 한 무연신 폴리프로필렌 필름이 일부 개발되어 사용되고 있으나, 인쇄적성, 열적안정성 등의 문제로 시장점유율이 극히 저조한 상태이다. Recently, some non-stretched polypropylene films that have been coextruded have been developed and used, but market share is extremely low due to problems such as printability and thermal stability.
때문에 PET가 꼬임성만 가질 수 있다면 기타 기계적특성, 인쇄적성, 투명성, 두께균일성, 컷팅성, 무해성 등 다양한 포장용도에서 요구되는 물성을 만족시킬 수 있는 장점을 가지고 있다. Therefore, if PET has only twist property, it has the advantage of satisfying the physical properties required for various packaging applications such as other mechanical properties, printability, transparency, thickness uniformity, cutting property and harmlessness.
그러나, PET의 특성상 높은 복원력(탄성회복특성)으로 인해 현재까지 꼬임성 이 있는 PET 필름은 개발이 되어 있지 않은 상태이다.
However, due to the high resilience (elastic recovery characteristics) of PET, PET films with kinetic properties have not been developed until now.
이에 본 발명에서는 카라멜, 사탕, 쵸콜렛 등과 같은 포장용도로 적합한 폴리에스테르 필름을 개발하기 위해 연구노력하던 중, 꼬임도(Twistability, θ)가 70°이하이면 적용가능함을 알게 되어 본 발명을 완성하게 되었다.Therefore, in the present invention, while trying to develop a polyester film suitable for packaging purposes such as caramel, candy, chocolate, etc., the present invention was found to be applicable if the twist degree (Twistability, θ) is 70 ° or less. .
또한, 상기와 같은 꼬임성을 갖는 폴리에스테르 필름은 제막조건(공정조건/연신/열처리 조건)을 조절하거나, 공중합 또는 블렌딩을 통한 조성물을 사용함으로써 얻어짐을 알게 되어 본 발명을 완성하게 되었다. In addition, it has been found that the polyester film having the above twistability is obtained by adjusting the film forming conditions (process conditions / stretching / heat treatment conditions) or by using a composition through copolymerization or blending, thereby completing the present invention.
따라서, 본 발명의 목적은 인체에 무해하고 친환경적이며, 꼬임성이 우수한 특성을 가지는 폴리에스테르 필름을 제공하는 데 있다. Accordingly, it is an object of the present invention to provide a polyester film that is harmless to the human body, environmentally friendly, and has excellent kinkability.
본 발명의 또 다른 목적은 꼬임성을 갖는 폴리에스테르 필름의 제조방법을 제공하는 데도 있다. Another object of the present invention is to provide a method for producing a polyester film having a twist.
상기와 같은 목적을 달성하기 위한 본 발명의 이축연신 폴리에스테르 필름은 Heat Gradient를 사용하여 압력 0.2MPa, 1sec, 상온의 조건 하에서 필름을 반으로 접은 후 30분 후 접힌 부분의 각(θ)을 다음 수학식 1을 통해 계산하여 얻어진 꼬임도(twistability, θ)가 70°이하인 것임을 그 특징으로 한다. The biaxially stretched polyester film of the present invention for achieving the above object is to fold the film in half under conditions of pressure 0.2MPa, 1sec, room temperature using Heat Gradient, and after 30 minutes the angle (θ) of the folded portion Twistability (θ) obtained by calculating through Equation 1 is characterized in that less than 70 °.
수학식 1Equation 1
θ=2sin-1(F/2L) θ = 2sin -1 (F / 2L)
상기 식에서, F는 반으로 접혀진 필름 양끝 점간을 이은 가상 선의 길이이고, 2L은 접혀진 필름의 총 길이이다. Where F is the length of the imaginary line between the two ends of the film folded in half, and 2L is the total length of the folded film.
상기와 같은 이축연신 폴리에스테르 필름은 폴리에틸렌테레프탈레이트 단독 또는 1종 이상의 공중합 성분을 혼합사용하여 얻어진 중합체를 이축연신하여 얻어지는 것으로서, 이축연신시 종방향의 연신비가 횡방향의 연신비보다도 크고, 종방향 연신온도는 조성물의 유리전이온도(Tg)를 기준으로 하여 다음 수학식 2를 만족하며, 횡방향 연신 온도는 다음 수학식 3을 만족하고, 열처리 온도는 다음 수학식 4를 만족하며, 릴렉스 구간에서 릴렉스율이 다음 수학식 5를 만족하는 조건하에서 이축연신 및 열고정이 수행되는 것을 그 특징으로 한다.The biaxially stretched polyester film as described above is obtained by biaxially stretching a polymer obtained by using polyethylene terephthalate alone or a mixture of one or more copolymerization components, and the stretching ratio in the longitudinal direction during biaxial stretching is greater than the stretching ratio in the transverse direction, and the longitudinal stretching is performed. The temperature satisfies the following Equation 2 on the basis of the glass transition temperature (Tg) of the composition, the transverse stretching temperature satisfies the following Equation 3, the heat treatment temperature satisfies the following Equation 4, relax in the relaxation period It is characterized in that biaxial stretching and heat setting are performed under the condition that the rate satisfies the following equation (5).
상기 식에서, Tg는 유리전이온도이다.Where Tg is the glass transition temperature.
상기 식에서, Tsm은 종방향연신온도이다.Where Tsm is the longitudinal stretching temperature.
상기 식에서 Tg는 유리전이온도이고, Tst는 횡방향연신온도이다.Where Tg is the glass transition temperature and Tst is the transverse stretching temperature.
이와같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.The present invention will be described in more detail as follows.
본 발명에 따른 꼬임특성을 가지는 폴리에스테르 필름을 만들기 위해서는 제막조건(필름제조 조건)을 최적화시키면 된다. What is necessary is just to optimize film forming conditions (film manufacturing conditions) in order to make the polyester film which has a twisting characteristic which concerns on this invention.
제막 조건의 최적화란, 폴리에틸렌테레프탈레이트 단독, 또는 폴리에스테르 공중합 성분의 첨가를 통해서도 가능한 바, 공중합 성분의 첨가는 중합방법이나 블렌딩 방법 어느 방법을 사용해도 무방하다. The optimization of the film forming conditions is also possible through the addition of polyethylene terephthalate alone or a polyester copolymerization component, and the addition of the copolymerization component may be any of polymerization method and blending method.
그리고, 각 조성물의 열적거동에 기준하여 제막조건 설정이 가능하다. In addition, the film forming conditions can be set based on the thermal behavior of each composition.
특히 조성물의 융점 이상 온도에서 용융시킨 후 압출 다이에서 유리전이온도 이하의 온도에서 급냉시킨 후 무정형 시트를 먼저 제조한다. 이렇게 제조된 무정형 시트를 종방향으로 3 내지 5배 연신 후 횡방향으로 3 내지 5배 연신하고, 냉각시켜 필름으로 제조한다. 특히 종방향과 횡방향의 연신비는 종방향의 연신비가 횡방향의 연신비보다도 큰 것이 바람직하다. In particular, the amorphous sheet is first prepared after melting at a temperature above the melting point of the composition and then quenching at a temperature below the glass transition temperature in the extrusion die. The amorphous sheet thus prepared is stretched 3 to 5 times in the longitudinal direction, 3 to 5 times in the transverse direction, and cooled to prepare a film. In particular, it is preferable that the draw ratio in the longitudinal direction and the transverse direction is larger than the draw ratio in the horizontal direction.
이러한 연신 공정에 있어서 종방향 연신온도는 조성물의 유리전이온도 이상에서 유리전이온도보다 30℃ 높은 온도 범위 사이에서 연신하는 것이 바람직하며, 좋기로는 유리전이온도에 가까운 저온 연신을 하는 것이다. 횡방향 연신도 종방향 연신온도 이상에서 종방향 연신온도보다 30℃ 높은 온도 범위 사이에서 연신하는 것이 바람직하다. In this stretching process, the longitudinal stretching temperature is preferably stretched at a temperature range of 30 ° C. higher than the glass transition temperature above the glass transition temperature of the composition, preferably low temperature stretching close to the glass transition temperature. It is preferable to extend | stretch in the temperature range 30 degreeC higher than the longitudinal stretch temperature above transverse stretch also the longitudinal stretch temperature.
또한 열처리 공정에서 열처리 온도는 유리전이온도 이상에서 횡방향연신온도 보다 30℃ 높은 온도 범위에서, 좋기로는 횡방향 연신온도 이하가 가장 적당하다. 필름을 제조한 후 후공정에서 인쇄 등의 공정에서 열을 받았을 경우 수축율을 최소화하기 위해서는 최소한 유리전이온도 이상의 온도에서 열처리가 되어야 한다. In the heat treatment process, the heat treatment temperature is most suitable in the temperature range of 30 ° C. higher than the transverse stretching temperature above the glass transition temperature, preferably below the transverse stretching temperature. After the film is manufactured, if it receives heat during the printing process in the post process, it must be heat-treated at a temperature above the glass transition temperature to minimize the shrinkage rate.
릴렉스 구간에서 릴렉스율은 3% 이하가 적당하며, 바람직하기로는 릴렉스율이 0%인 것이 바람직하다. 오히려 열고정 구간에서 연신(릴렉스율 -3%)을 하였을 경우에도 가능하다. 하지만 연신하였을 경우에 외관상 주름이 다소 발생하는 경우가 있다. In the relaxation section, the relaxation rate is preferably 3% or less, and preferably, the relaxation rate is 0%. Rather, it is possible to draw in the heat setting section (relax rate -3%). However, there may be some wrinkles in appearance when drawn.
여기서, 공중합 성분으로는 이소프탈릭엑시드 및 아디픽엑시드와 같은 엑시드류, 나프탈렌디카르복실릭메틸에스테르와 같은 에스테르류, 디에틸렌글리콜, 부틸렌글리콜, 프로필렌글리콜, 사이클로헥사디메탄올, 네오펜틸글리콜, 폴리에틸렌글리콜, 폴리프로필렌글리콜 및 폴리테트라메틸렌글리콜과 같은 알코올류 중에서 선택된 1종 이상의 공중합 성분의 혼합물을 들 수 있다. Here, as the copolymerization component, an acid such as isophthalic acid and adipic acid, esters such as naphthalenedicarboxylic methyl ester, diethylene glycol, butylene glycol, propylene glycol, cyclohexadimethanol, neopentyl glycol, And mixtures of one or more copolymer components selected from alcohols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol.
이와같은 조건 만족 하에 연신 및 열고정을 수행할 수 있는 중합체로서 공중합 조성물을 사용할 경우, 폴리에틸렌테레프탈레이트의 기본 결정구조형성을 방해함으로써 탄성이 적어져서 복원력을 낮출 수 있다. When the copolymer composition is used as a polymer capable of performing stretching and heat setting under such conditions, it is possible to lower the restoring force by decreasing the elasticity by preventing the formation of the basic crystal structure of polyethylene terephthalate.
특히 공중합체의 구조적으로는 선형의 네오펜틸글리콜과 같은 알코올류나 아디픽엑시드와 같은 엑시드류를 사용하는 것보다는 환형의 구조를 갖는 이소프탈릭엑시드나 사이클로헥사디메탄올과 같은 구조의 공중합 성분을 1종 또는 2종 이상 혼합사용하는 것이 바람직하다. 특히 이러한 환형구조의 공중합성분 중에서 비대칭적인 구조를 갖는 성분을 사용하는 것이 바람직하다. In particular, the copolymer is composed of one type of copolymerized component such as isophthalic acid or cyclohexadimethanol having a cyclic structure, rather than using alcohols such as linear neopentyl glycol or acids such as adipic acid. Or it is preferable to mix and use 2 or more types. In particular, it is preferable to use a component having an asymmetrical structure among such cyclic copolymers.
이축연신 폴리에스테르 필름 제조시 이러한 공중합체를 단독 또는 2종 이상으로 사용하여 제조된 폴리에스테르류와 혼합하여 사용하여도 무관하다.
In the production of a biaxially stretched polyester film, such a copolymer may be used alone or in combination with polyesters prepared by using two or more kinds thereof.
이하, 본 발명을 실시예에 의거 상세히 설명하면 다음과 같은 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the Examples.
이하의 실시예에서 필름의 꼬임도의 측정은 다음과 같은 방법에 의해 수행되었다. In the following examples, the twisting degree of the film was measured by the following method.
외력에 의해 변형이 생긴 물체가 다시 회복하지 못하는 정도가 높을수록 꼬임성은 좋다고 할 수 있다. 때문에 꼬임성의 평가방법은 동일한 압력으로 동일한 시간동안 필름을 접은 후 압력을 제거하고 나서 필름의 접힘 정도로써 비교하였다. The higher the degree to which the object deformed by the external force cannot recover again, the better the twistability. Therefore, the evaluation method of twistability was compared by folding the film at the same pressure for the same time and then removing the pressure and then folding the film.
(1)사용기기: Heat Gradient(Toyoseiki사 제품)(1) Equipment used: Heat Gradient (Toyoseiki Co., Ltd.)
(2)측정기기조건: 압력 - 0.2MPa, 시간 - 1sec, 온도 -상온(2) Measuring equipment condition: pressure-0.2MPa, time-1sec, temperature-room temperature
(3)시험편: 크기(폭×길이) - 10mm×15mm(3) Test piece: size (width × length)-10mm × 15mm
(4)접힘정도 평가방법(4) Evaluation method of folding degree
상기와 같은 방법으로 필름에 일정한 압력을 가하고 난 후 30분 후 접힌 부분의 각을 계산하여 비교하였는 바, 계산 방법은 도 1을 참조하여 상기 수학식 1에 근거한 것이다. 도 1에 있어서 W는 8mm이고, L은 8mm이다. After applying a constant pressure to the film in the same manner as described above 30 minutes after the angle of the folded portion was calculated and compared, the calculation method is based on Equation 1 with reference to FIG. In FIG. 1, W is 8 mm and L is 8 mm.
θ로 꼬임성 비교평가가 가능하며, 상기 조건에서 θ의 범위가 0°≤θ≤70°일때 꼬임특성이 우수한 것으로 나타난다.
It is possible to compare and evaluate the twistability with θ, and the twist property is excellent when the range of θ is 0 ° ≦ θ ≦ 70 ° under the above conditions.
실시예 1 내지 2 및 비교예 1 내지 4Examples 1-2 and Comparative Examples 1-4
폴리에틸렌테레프탈레이트를 압출한 후 급냉하여 무정형의 시트를 제조하고, 이를 다시 다음 표 1에 나타낸 바와 같은 조건별로 축차 이축연신하여 필름을 제조하였다. After extruding the polyethylene terephthalate was quenched to prepare an amorphous sheet, which was again biaxially stretched according to the conditions as shown in Table 1 below to prepare a film.
폴리에틸렌테레프탈레이트의 유리전이온도(Tg)는 급냉 무연신 시트를 시차주사열량계(DSC)로 분석한 결과 68℃였다. The glass transition temperature (Tg) of the polyethylene terephthalate was 68 ° C. when the quenched and unstretched sheet was analyzed with a differential scanning calorimeter (DSC).
상기한 방법에 따라 꼬임도를 평가한 결과는 다음 표 2와 같다. The results of evaluating the twisting degree according to the above method are shown in Table 2 below.
상기 표 2의 결과로부터, 본 발명 실시예에 따라 얻어진 폴리에스테르 필름의 θ가 70°이하로 우수한 접힘특성을 보임을 알 수 있다.
From the results in Table 2, it can be seen that θ of the polyester film obtained according to the embodiment of the present invention exhibits excellent folding characteristics of 70 ° or less.
실시예 3 내지 7 및 비교예 5Examples 3 to 7 and Comparative Example 5
본 예들은 공중합 조성을 이용한 폴리에틸렌테레프탈레이트로 만들어진 이축 연신 폴리에틸렌테레프탈레이트 필름에 관한 것으로서, 다음 표 3에 나타낸 바와 같은 공중합 성분을 사용하여 폴리에틸렌테레프탈레이트를 압출한 후 급냉하여 무정형의 시이트를 제조하고, 필름 제조조건은 실시예 3 내지 7은 종방향 연신비 4.0배, 횡방향 연신비 3.5배, 연신온도 종방향 Tg+25℃, 횡방향은 종방향연신온도+10℃, 릴렉스율은 0%, 열처리온도는 연신온도+10℃로 상기 실시예의 범위에 포함되는 조건으로 수행하였다. The present examples relates to a biaxially stretched polyethylene terephthalate film made of polyethylene terephthalate using a copolymerization composition. Extruded polyethylene terephthalate using a copolymerization component as shown in Table 3 below, followed by quenching to prepare an amorphous sheet, and a film. As for manufacturing conditions, Examples 3-7 are 4.0 times of longitudinal stretch ratios, 3.5 times of lateral stretch ratios, and extending | stretching temperature longitudinal direction Tg + 25 degreeC, transverse direction longitudinal direction stretch temperature +10 degreeC, relaxation rate is 0%, and heat processing temperature is Stretching temperature was carried out under the conditions included in the range of the above Examples at +10 ℃.
비교예 5는 열처리온도를 연신온도+50℃로 하여 제조한 경우이다.Comparative Example 5 is a case where the heat treatment temperature is prepared by stretching temperature + 50 ° C.
상기 표 3의 결과로부터, 공중합 성분을 포함하더라도 제조조건이 부합되지 않는 비교예 5의 경우 꼬임도가 감소함을 알 수 있다.
From the results of Table 3, it can be seen that even in the case of the comparative example 5, including the copolymerization component does not meet the manufacturing conditions, the degree of twist.
이상에서 상세히 설명한 바와 같이, 본 발명에 따라 일정 방법으로 측정된 꼬임도가 일점 범위를 만족하는 폴리에스테르 필름은 고유하게 우수한 기계적특성, 인쇄적성, 투명성, 두께균일성, 컷팅성, 무해성 등을 지니면서 꼬임성을 가져 사탕, 카라멜 또는 쵸콜렛 포장재와 같은 포장재로 유용하다. As described in detail above, the polyester film measured by a certain method according to the present invention satisfies one point range is inherently excellent in mechanical properties, printability, transparency, thickness uniformity, cutting properties, harmlessness, etc. It is also useful as a packaging material such as candy, caramel or chocolate packaging.
Claims (7)
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| PCT/KR2005/001978 WO2006001659A1 (en) | 2004-06-25 | 2005-06-24 | Biaxially oriented polyester films and processing method thereof |
| TW094121158A TWI292409B (en) | 2004-06-25 | 2005-06-24 | Biaxially oriented polyester films and processing method thereof |
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| WO2009083771A1 (en) | 2007-12-27 | 2009-07-09 | Polyplex Corporation Limited | Biaxial oriented polyester film and a process for preparing the same |
| KR100932289B1 (en) * | 2008-07-30 | 2009-12-16 | 주식회사 코오롱 | Twistable Polyester Films |
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| WO1999054529A1 (en) * | 1998-04-23 | 1999-10-28 | E.I Dupont De Nemours And Company | Polyester film and methods for making same |
| JP2001200073A (en) | 2000-01-20 | 2001-07-24 | Toray Ind Inc | Polyester film for lamination |
| KR20030048185A (en) * | 2001-12-11 | 2003-06-19 | 에스케이씨 주식회사 | Biaxially oriented polyester film |
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| WO1999054529A1 (en) * | 1998-04-23 | 1999-10-28 | E.I Dupont De Nemours And Company | Polyester film and methods for making same |
| JP2001200073A (en) | 2000-01-20 | 2001-07-24 | Toray Ind Inc | Polyester film for lamination |
| KR20030048185A (en) * | 2001-12-11 | 2003-06-19 | 에스케이씨 주식회사 | Biaxially oriented polyester film |
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