KR900006301B1 - Process for the stretching of a polyester film - Google Patents
Process for the stretching of a polyester film Download PDFInfo
- Publication number
- KR900006301B1 KR900006301B1 KR1019870009322A KR870009322A KR900006301B1 KR 900006301 B1 KR900006301 B1 KR 900006301B1 KR 1019870009322 A KR1019870009322 A KR 1019870009322A KR 870009322 A KR870009322 A KR 870009322A KR 900006301 B1 KR900006301 B1 KR 900006301B1
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- Prior art keywords
- sheet
- stretching
- film sheet
- polyester film
- film
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
본 발명은 폴리에스테르필름의 연신방법에 관한 것으로서, 더욱 상세하게는 필름의 종(從)연신시 가장자리부와 중앙부의 연신비차(比差)를 방지하고, 후공정인 횡(橫)연신을 원활하게 하여, 필름의 웨스트(waste)현상을 감소시키고, 제품의 품질을 크게 향상시킬 수 있는 폴리에스테르필름시이트의 연신방법에관한 것이다.The present invention relates to a method for stretching a polyester film, and more particularly, to prevent stretching ratios between edges and center portions during longitudinal stretching of a film, and to smooth laterally stretching, which is a post-process. In this regard, the present invention relates to a method of drawing a polyester film sheet, which can reduce waist phenomenon of a film and greatly improve the quality of a product.
종래에 폴리에스테르필름시이트를 종연신시킬 경우에는 연신시키고자하는 필름부위를 IR-가열기에 의한 간접방식으로 가열하여 연신에 필요한 열을 얻고, 필름의 이동로울러의 구동차에 의해서 연신력을 얻어서 필름시이트를 종연신시켜 왔는바, 이렇게하는 경우 연신메카니즘상에서 필름시이트의 중앙부위와 가장자리부위의 실제 연신정도가 크게 차이가 발생되곤 하였다.In the case of longitudinal stretching of a conventional polyester film sheet, the film portion to be stretched is heated by an indirect method using an IR-heater to obtain heat required for stretching, and a drawing force is obtained by a driving difference of a film moving roller. In this case, the actual stretching degree between the center portion and the edge portion of the film sheet was greatly different in the drawing mechanism.
즉, IR-가열기의 중앙부위와 가장자리부위의 온도차가 동일할 경우에는 필름시이트의 중앙부위와 가장자리부위가 받는 연신력에 차이가 발생되어 시이트의 배향도 및 결정화도가 다음표에 나타낸 바와같이 틀려지게 된다(시이트의 중앙부위보다 가장자리부위가 배향도나 결정화도가 많이 생기게 된다.)That is, when the temperature difference between the center and the edge of the IR-heater is the same, there is a difference in the stretching force applied to the center and the edge of the film sheet, and the orientation and crystallinity of the sheet are different as shown in the following table. (The edge portion has more orientation or crystallinity than the center portion of the sheet.)
특히, 상술한 바와같은 종연신을 실시한 후에 횡연신을 실시할 경우에는 시이트의 가장자리부위에 트림(Trim)량이 증대되는 결과가 발생되기도 한다.In particular, when transverse stretching is performed after the longitudinal stretching as described above, the amount of trim may be increased at the edge of the sheet.
또한, VDO용 베이스필름인 경우에는 필름특성상 시이트의 중앙부와 가장자리부의 표면특성(마찰계수, 표면조도)이 서로 다른 것이 유리한데, 상술한 바와같이 종연신시 IR-가열기를 사용할 경우에는 간접가열방식인 상기 IR-가열기의 영향을 받는면과 받지 않는 면간의 표면특성차이가 별로 나타나지 않게되는 문제점이 있었다.In the case of the VDO base film, it is advantageous that the surface characteristics (friction coefficient, surface roughness) of the center and the edge of the sheet are different from each other due to the characteristics of the film.In the case of using the IR-heater for longitudinal stretching as described above, the indirect heating method is used. There was a problem in that the surface characteristic difference between the surface affected by the IR-heater and the surface not affected by the IR-heater did not appear much.
이에 본 발명에서는 종래의 이와같은 문제점을 해소시키기 의하여, 필름시이트의 종연신을 위한 가열공정시 종래의 IR-가열기 대신 통상적인 고열건조공기노즐을 사용하여 필름시이트에 대한 가열방식을 변경시켜 시이트의 중앙부와 가장자리부의 연신비차를 방지하여 필름의 웨스트현상을 감소시키고, 제품의 품질을향상시킬 수 있는 폴리에스테르필름시이트의 연신방법을 제공하는데 그 목적이 있다.Accordingly, in the present invention, by solving such problems in the prior art, the heating method for the film sheet is changed by using a conventional high-temperature dry air nozzle instead of the conventional IR-heater during the heating process for longitudinal stretching of the film sheet. It is an object of the present invention to provide a method of stretching a polyester film sheet which can prevent the stretching ratio between the center and the edges, thereby reducing the west phenomenon and improving the quality of the product.
이하 본 발명을 상세하게 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.
본 발명은 폴리에스테르 필름시이트의 종연신 공정에 있어서, 필름시이트를 직접적으로 가열시키는 고열건조공기노즐에 통과시키되 시이트의 중앙부위를 125 내지 140℃로 가열시키고, 시이트의 가장자리부위는냉각공기를 공급하면서 120 내지 135℃의 온도로 조정가열시켜서 이들 온도차에 의하여 연신에 필요한 에너지가 얻어지도록 하여서 됨을 특징으로 하는 폴리에스테르필름시이트의 연신방법인 것이다.In the longitudinal stretching process of the polyester film sheet, the present invention is passed through a high temperature dry air nozzle which directly heats the film sheet, and the center portion of the sheet is heated to 125 to 140 ° C., and the edge portion of the sheet supplies cooling air. While the heating is adjusted to a temperature of 120 to 135 ℃ to obtain the energy required for stretching by these temperature difference is a stretching method of the polyester film sheet characterized in that.
이와같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.The present invention will be described in more detail as follows.
본 발명은 폴리에스테르필름을 제조하는 공정중에서 필름시이트를 종방향으로 연신시킬때 적합한 것으로서, 이때 일반적인 폴리에스테르 필름제조공정을 요약하여 보면 다음과 같다 즉, 먼저 폴리에스테르칩(chip)을 제조한 후 이를 건조 추출하여 필름시이트를 형성시킨다음 종연신과 횡연신을 거쳐 이를 권취하고 슬리팅(slitting)하게 되면 원하는 폴리에스테르필름이 얻어지게 된다. 여기서, 종연신부는 시이트의 온도를서서히 올려주게되는 예열부와 이동로울러의 구동속도차를 통해 연신시기는 연신부로 이루어져 있는데, 이때 종래에는 연신부에서 IR-가열기를 사용해 시이트를 가열함으로서 연신에 필요한 시이트의 온도를 맞추곤하였다.The present invention is suitable when the film sheet is stretched in the longitudinal direction in the process of producing a polyester film, in which the general polyester film manufacturing process is summarized as follows, that is, after first producing a polyester chip (chip) The film is dried and extracted to form a film sheet, which is then wound and slitting through longitudinal and lateral stretching to obtain a desired polyester film. Here, the longitudinal stretching portion is composed of a preheating portion that raises the temperature of the sheet slowly and the stretching time is the stretching portion through the drive speed difference of the moving roller. The sheet was used for temperature.
이와같은 상기 공정단계에서 폴리에스테르칩으로부터 형성된 필름시이트를 연신시키는 종연신단계가 최종적으로 얻어지게되는 필름제품의 특성을 좌우하게 되는바, 이에 대해 상기와 같이 연신부에서 IR-가열기를 이용하여 종연신공정을 수행하게 될 경우에는 필름시이트의 중앙부위 연신력은 필름의 진행방향과 동일하여 종연신공정에서 별무리없이 연신이 가능하나, 필름시이트의 가장자리부위는 연신력이 실제적으로 중앙부위와는 달러 종연신력에 따라 일정각도 만큼 중앙부위방향으로 기울게되면서 오그라들게된다.In this process step, the longitudinal stretching step of stretching the film sheet formed from the polyester chip is to determine the characteristics of the film product finally obtained, as described above using the IR-heater in the stretching section In the case of performing the new process, the stretching force in the center portion of the film sheet is the same as the direction of the film, so it can be stretched in any longitudinal stretching process.However, the edge portion of the film sheet is actually stretched in dollars compared to the center portion. Depending on the angle of inclination in the direction of the central portion will be shrunk.
이에 따라 필름시이트의 중앙부위보다 가장자리부위의 배향각도 및 결정화도가 크게되어 종연신 다음 단계인 횡연신시 가장자리부위의 연신이 중앙부위의 연신보다 어렵게 진행되고, 그로 인해 필름의 양쪽 끝부분을 제품으로서 활용할 수 없었다.As a result, the orientation angle and crystallinity of the edge portion are greater than that of the center portion of the film sheet, so that the edge portion is more difficult to stretch than the center portion during the lateral stretching, the next stage of longitudinal stretching. I couldn't use it.
본 발명에서는 필름시이트의 이러한 가열방식을 변경시키기 위하여 고열건조공기노즐을 이용한 직접가열방식을 채택하였는바, 즉 폴리에스테르 칩으로부터 형성된 필름시이트를 예열시키고 이어서 연신부에서 연신시킬때 단면(setion)에 의하여 4부분으로 나눠어지게 되는 필름시이트의 중앙 2부분에 노즐을 통해서 고열공기를 공급하면서 약 125 내지 140℃로 가열시키고, 단면에 의하여 양끝부분으로 나뉘어져 있는 필름 시이트의 가장자리부분은 냉각공기를 공급하여 이 부위에 공급되는 고열공기의 온도를 120 내지 135℃로 낮추어서 가열되어지도륵 하여 필름시이트의 중앙부위와 가장자리부위가 일정한 온도차(가장자리온도보다 중앙부위온도가 항상 높게)에 의하여 두 부위가 양면특성을 나타내도록 하였다. 더우기 고열공기를 공급하게되는 공기노즐의 각도를 조정할 수 있도록 되어 있으므로 필름시이트의 양면특성을 필요에 따라서는 변화시킬수도 있다. 이렇게 필름시이트의 중앙부위와 가장자리부위를 온도차를 주면서 가열시키게 되므로서 필름시이트 가장자리부위의 폴리머사를배향각도나 결정화를 조정할 수 있고, 횡연신후 필름의 양끝의 제품손실분을 크게 줄일수도 있으며, 특히 VDO용 베이스필름의 중요한 특징의 하나인 표면특성의 차를 나타낼 수 있으므로 필를의 제품특성을 크게 향상시킬 수 있는 효과가 있다.In the present invention, in order to change the heating method of the film sheet, a direct heating method using a high-temperature dry air nozzle is adopted. That is, when the film sheet formed from the polyester chip is preheated and then stretched in the drawing section, It is heated to about 125 to 140 ℃ while supplying high heat air through the nozzle to the center two parts of the film sheet which is divided into four parts by the four sides, and the edge of the film sheet divided into both ends by the cross section supplies cooling air The temperature of the high-temperature air supplied to this area is lowered to 120 to 135 ℃ and heated.The two parts are double-sided due to the constant temperature difference (the central part temperature is always higher than the edge temperature) of the film sheet. It was intended to exhibit the characteristics. Moreover, since the angle of the air nozzle that supplies the hot air can be adjusted, the double-sided characteristics of the film sheet can be changed as necessary. By heating the center and edge of the film sheet with a temperature difference, the orientation of the polymer yarn at the edge of the film sheet can be adjusted and the crystallization angle can be adjusted, and the product loss at both ends of the film can be greatly reduced after transverse stretching. Since the difference in surface properties, which is one of the important characteristics of the base film for VDO, can be exhibited, there is an effect of greatly improving the product properties of the fill.
이와같은 본원 발명에 의하여 제조된 최종필름의 표면특성 및 생산량을 종래방법과 비교하여 나타내면 다음 표와 같다.The surface characteristics and the yield of the final film produced according to the present invention as compared with the conventional method are shown in the following table.
* 1. 종연신조건중 예열부의 온도는 공히 85 내지 100℃이다.* 1. The temperature of the preheating part in the longitudinal drawing condition is 85 to 100 ° C.
2. 연신후 기대속도는 100m/min이다.2. The expected speed after stretching is 100m / min.
3. 생산량의 증가는 종래방법을 기준으로 환산한 것이다.3. The increase in production is based on the conventional method.
4. 본 발명에 따른 실험 1 내지 실험 3의 고열공기압력은 20m³/min이다.4. The high hot air pressure of Experiments 1 to 3 according to the present invention is 20 m³ / min.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019870009322A KR900006301B1 (en) | 1987-08-26 | 1987-08-26 | Process for the stretching of a polyester film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019870009322A KR900006301B1 (en) | 1987-08-26 | 1987-08-26 | Process for the stretching of a polyester film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR890003514A KR890003514A (en) | 1989-04-15 |
| KR900006301B1 true KR900006301B1 (en) | 1990-08-28 |
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ID=19263980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019870009322A KR900006301B1 (en) | 1987-08-26 | 1987-08-26 | Process for the stretching of a polyester film |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR900006301B1 (en) |
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1987
- 1987-08-26 KR KR1019870009322A patent/KR900006301B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR890003514A (en) | 1989-04-15 |
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