CN113771346A - Biaxial extension process for LCP (liquid Crystal Polymer) film - Google Patents
Biaxial extension process for LCP (liquid Crystal Polymer) film Download PDFInfo
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- CN113771346A CN113771346A CN202111051811.0A CN202111051811A CN113771346A CN 113771346 A CN113771346 A CN 113771346A CN 202111051811 A CN202111051811 A CN 202111051811A CN 113771346 A CN113771346 A CN 113771346A
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- 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
- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
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- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/28—Storing of extruded material, e.g. by winding up or stacking
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
Abstract
The invention discloses a biaxial extension process for LCP film, which comprises the following steps: s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature; s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, and heating by using a water bath heating device in the biaxial stretching process; s3, then carrying out short-time heat treatment on the film under tension; s4, cooling and winding to obtain the biaxially stretched LCP film; according to the invention, the longitudinal and transverse stretching ratios of the LCP film are matched with each other, so that the fiberization of the film in a certain stretching direction is avoided, the mechanical property in the stretching direction can be improved, the longitudinal and transverse stretching strength and the elastic modulus of the LCP film can be improved, the breakage rate of the LCP film in the stretching process can be reduced, and the longitudinal and transverse stretching ratio of the LCP film can be improved by performing the transverse and longitudinal biaxial stretching in a heating solution, so that the longitudinal and transverse stretching strength and the elastic modulus of the LCP film are further improved.
Description
Technical Field
The invention relates to the technical field of LCP films, in particular to a biaxial extension process for LCP films.
Background
In recent years, with the rapid development of the electronic industry, electronic devices have been increasingly miniaturized, thinned, and highly functionalized, and the demand for packaging substrates in electronic devices has been increasing in high-tech fields such as communications, industrial automation, and aerospace. The requirements of the rapid development, densification, digitization, high frequency and application in special environment of electronic information products, especially microwave devices, have already provided great challenges for the general high frequency board and the manufacturing process thereof. For LCP materials used in the high frequency field, excellent dielectric properties, i.e., low dielectric constant and low dielectric loss factor, are required, and generally, after the LCP film is formed, biaxial stretching process treatment is required.
However, the difference between the longitudinal stretching ratio and the transverse stretching ratio of the conventional biaxial stretching process is large, which causes the fiberization of the film in a certain stretching direction, thereby causing the reduction of the mechanical property of the direction, when the longitudinal stretching ratio is too high, the film breaking probability during transverse stretching can be obviously increased, and when the longitudinal stretching ratio is too low, the mechanical property of the film can be influenced, and the problem of the increase of the tolerance fluctuation of the longitudinal thickness of the film can also occur.
Disclosure of Invention
The invention aims to provide a biaxial extension process for LCP (liquid Crystal Polymer) films, which solves the problem that the longitudinal-transverse stretching ratio of the traditional biaxial extension process is relatively poor.
In order to achieve the purpose, the invention provides the following technical scheme: a biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, and heating by using a water bath heating device in the biaxial stretching process;
s3, then carrying out short-time heat treatment on the film under tension;
s4, cooling and winding to obtain the biaxially stretched LCP film.
Preferably, the biaxial stretching device works according to the following principle: a group of rolling cylinders with different rotating speeds is used for stretching to a certain multiple (longitudinal stretching) in parallel to the axial direction, and then the stretching angle gradually expanded on a clamp guide rail is used for stretching to a certain multiple (transverse stretching) in perpendicular to the axial direction.
Preferably, in step S2, the water bath heating device comprises a water tank and a heating solution, a temperature sensor and a heating plate are further fixedly mounted in the water tank, the biaxial stretching device is arranged inside the water tank, and the temperature sensor is used for detecting the temperature of the heating solution in the water tank.
Preferably, the heating solution is formed by mixing methyl silicone oil and a latent solvent, and the content of the latent solvent is 40-60%.
Preferably, in the step S2, the heating temperature is 130-150 ℃, and the drawing speed is 15-30 m/min.
Preferably, in the step S3, the heat treatment temperature is 170 to 180 ℃.
Preferably, in the step S2, the longitudinal stretching ratio is 2.6 to 2.9, and the transverse stretching ratio is 2.9 to 3.4.
Preferably, the latent solvent is any one of dimethylformamide, dimethyl phthalate, propylene carbonate and vinyl nitrate.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the longitudinal stretching ratio and the transverse stretching ratio of the LCP film are close to each other, so that the fiberization of the film in a certain stretching direction is avoided, the mechanical property in the direction can be improved, the longitudinal and transverse stretching strength and the elastic modulus of the LCP film can be improved, the breakage rate of the LCP film in the stretching process can be reduced, the longitudinal and longitudinal biaxial stretching is carried out in a heating solution, the latent solvent can destroy the hydrogen bond bonding between molecular chains at high temperature, the fiberization of the LCP film in a certain direction is avoided, the longitudinal and transverse stretching ratio of the LCP film can be improved, the longitudinal and transverse stretching strength and the elastic modulus of the LCP film are further improved, and the optical property of the LCP film can be effectively improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, and heating by using a water bath heating device in the biaxial stretching process;
s3, then carrying out short-time heat treatment on the film under tension;
s4, cooling and winding to obtain the biaxially stretched LCP film.
The working principle of the biaxial stretching equipment is as follows: a group of rolling cylinders with different rotating speeds is used for stretching to a certain multiple (longitudinal stretching) in parallel to the axial direction, and then the stretching angle gradually expanded on a clamp guide rail is used for stretching to a certain multiple (transverse stretching) in perpendicular to the axial direction.
Wherein, in step S2, the water bath heating device comprises a water tank and a heating solution, a temperature sensor and a heating plate are fixedly arranged in the water tank, the biaxial stretching equipment is arranged in the water tank, and the temperature sensor is used for detecting the temperature of the heating solution in the water tank.
Further, can realize the heating to heating solution in the water tank through the hot plate, temperature sensor can real-time detection heating solution's in the water tank temperature simultaneously for heating solution carries out heat treatment as heat-conducting medium to the LCP membrane, can ensure the homogeneity that the LCP membrane is heated when violently indulging stretching, the axis temperature of LCP membrane will be less than the temperature at LCP membrane both ends when avoiding transversely stretching, thereby can guarantee that the LCP membrane is transversely ascending to be heated evenly.
Wherein the heating solution is formed by mixing methyl silicone oil and a latent solvent, and the content of the latent solvent is 40-60%.
Wherein, in the step S2, the heating temperature is 130-150 ℃, and the drawing speed is 15-30 m/min.
In step S3, the heat treatment temperature is 170 to 180 ℃.
Further, the heat treatment can not only realize the heat setting of the LCP film, but also evaporate the methyl silicone oil and the latent solvent adhered on the LCP film, thereby ensuring the cleanliness of the LCP film.
Wherein, in step S2, the longitudinal stretching ratio is 2.6-2.9, and the transverse stretching ratio is 2.9-3.4.
Wherein the latent solvent is any one of dimethylformamide, dimethyl phthalate, propylene carbonate and ethylene nitrate.
Example 1:
referring to fig. 1, the present invention provides a technical solution: a biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, wherein a water bath heating device is used for heating the film in the biaxial stretching process, the content of the latent solvent is 0%, the heating temperature is 140 ℃, the stretching speed is 25m/min, the longitudinal stretching ratio is 2.6, and the transverse stretching ratio is 2.9;
s3, then carrying out short-time heat treatment on the film under the condition of tensioning, wherein the temperature of the heat treatment is 180 ℃;
s4, cooling and winding to obtain the biaxially stretched LCP film.
Example 2:
referring to fig. 1, the present invention provides a technical solution: a biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, wherein a water bath heating device is used for heating the film in the biaxial stretching process, the content of the latent solvent is 0%, the heating temperature is 140 ℃, the stretching speed is 25m/min, the longitudinal stretching ratio is 2.7, and the transverse stretching ratio is 3.1;
s3, then carrying out short-time heat treatment on the film under the condition of tensioning, wherein the temperature of the heat treatment is 180 ℃;
s4, cooling and winding to obtain the biaxially stretched LCP film.
Example 3:
referring to fig. 1, the present invention provides a technical solution: a biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, wherein a water bath heating device is used for heating the film in the biaxial stretching process, the content of the latent solvent is 0%, the heating temperature is 140 ℃, the stretching speed is 25m/min, the longitudinal stretching ratio is 2.8, and the transverse stretching ratio is 3.2;
s3, then carrying out short-time heat treatment on the film under the condition of tensioning, wherein the temperature of the heat treatment is 180 ℃;
s4, cooling and winding to obtain the biaxially stretched LCP film.
Example 4:
referring to fig. 1, the present invention provides a technical solution: a biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, wherein a water bath heating device is used for heating the film in the biaxial stretching process, the content of the latent solvent is 0%, the heating temperature is 140 ℃, the stretching speed is 25m/min, the longitudinal stretching ratio is 2.9, and the transverse stretching ratio is 3.4;
s3, then carrying out short-time heat treatment on the film under the condition of tensioning, wherein the temperature of the heat treatment is 180 ℃;
s4, cooling and winding to obtain the biaxially stretched LCP film.
Test example 1
In order to facilitate the understanding of the technical solutions of the present invention, the following is a further explanation of the present invention with reference to experimental data:
table 1 shows the effect of the longitudinal and transverse stretch ratios on the longitudinal and transverse tensile strength and light transmission of LCP films in examples 1-4 and in a control (the control is a LCP film of the trade-mark polycide type and having the model number KG300-130 GTI):
the test method comprises the following steps: testing the longitudinal and transverse tensile strength of the LCP film: according to the standard GB13022-91, the temperature is 23 ℃, the humidity is 40 percent, and the stretching speed is 100 mm/min;
LCP film longitudinal and transverse tensile modulus determination: according to standard QB/T1130-1991, the temperature is 23 ℃, the humidity is 50 percent, and the stretching speed is 100 mm/min;
LCP film light transmittance determination: according to standard GB/T2410-1980.
TABLE 1
As can be seen from the experimental data in table 1, when the heating temperature and the stretching speed are the same, the longitudinal and lateral tensile strength and the elastic modulus of the LCP film are the highest and the light transmittance of the LCP film is also the highest when the longitudinal stretching ratio is 2.8 and the lateral stretching ratio is 3.2, and when the longitudinal stretching ratio and the lateral stretching ratio of the LCP film are substantially the same or close to each other, the longitudinal and lateral tensile strength and the elastic modulus of the LCP film are also increased as the longitudinal stretching ratio and the lateral stretching ratio are increased, and when the longitudinal stretching ratio is 2.9 and the lateral stretching ratio is 3.4, the LCP film may be damaged during production due to the excessively high longitudinal and lateral stretching ratio.
Comparative example 1:
the process of example 4 is followed except that in step S2, the cosolvent content is 40%.
Comparative example 2:
the process of example 4 is followed except that in step S2, the cosolvent content is 47%.
Comparative example 3:
the process of example 4 is followed except that in step S2, the cosolvent content is 54%.
Comparative example 4:
the process of example 4 is followed except that in step S2, the cosolvent content is 60%.
Test example 2
In order to facilitate the understanding of the technical solutions of the present invention, the following is a further explanation of the present invention with reference to experimental data:
table 2 is the effect of the machine direction stretch ratio and the transverse direction stretch ratio on the LCP film cross-machine direction tensile strength and light transmittance in comparative examples 1 to 4 and example 4:
the test method comprises the following steps: testing the longitudinal and transverse tensile strength of the LCP film: according to the standard GB13022-91, the temperature is 23 ℃, the humidity is 40 percent, and the stretching speed is 100 mm/min;
LCP film longitudinal and transverse tensile modulus determination: according to standard QB/T1130-1991, the temperature is 23 ℃, the humidity is 50 percent, and the stretching speed is 100 mm/min;
LCP film light transmittance determination: according to standard GB/T2410-1980.
TABLE 2
As can be seen from the experimental data in table 2, when the heating temperature, the stretching speed, the longitudinal stretching ratio, and the transverse stretching ratio are the same, the latent solvent is added to break the hydrogen bonding between the molecular chains at a high temperature, so as to avoid the fiberization of the LCP film in a certain direction, improve the film forming quality of the LCP film, and reduce the film breaking probability of the LCP film during the transverse stretching.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A biaxial stretching process for LCP film comprising the steps of:
s1, supercooling the melt extruded from the extruder die head, and then heating the melt to the orientation temperature;
s2, carrying out biaxial stretching on the film by using biaxial stretching equipment, and heating by using a water bath heating device in the biaxial stretching process;
s3, then carrying out short-time heat treatment on the film under tension;
s4, cooling and winding to obtain the biaxially stretched LCP film.
2. A biaxial stretching process for LCP film according to claim 1, wherein: the working principle of the biaxial stretching equipment is as follows: a group of rolling cylinders with different rotating speeds is used for stretching to a certain multiple (longitudinal stretching) in parallel to the axial direction, and then the stretching angle gradually expanded on a clamp guide rail is used for stretching to a certain multiple (transverse stretching) in perpendicular to the axial direction.
3. A biaxial stretching process for LCP film according to claim 1, wherein: in step S2, the water bath heating device comprises a water tank and a heating solution, a temperature sensor and a heating plate are further fixedly mounted in the water tank, the biaxial stretching equipment is arranged inside the water tank, and the temperature sensor is used for detecting the temperature of the heating solution in the water tank.
4. A biaxial stretching process for LCP film according to claim 3, wherein: the heating solution is formed by mixing methyl silicone oil and a latent solvent, and the content of the latent solvent is 40-60%.
5. A biaxial stretching process for LCP film according to claim 1, wherein: in the step S2, the heating temperature is 130-150 ℃, and the drawing speed is 15-30 m/min.
6. A biaxial stretching process for LCP film according to claim 1, wherein: in the step S3, the temperature of the heat treatment is 170 to 180 ℃.
7. A biaxial stretching process for LCP film according to claim 1, wherein: in the step S2, the longitudinal stretching ratio is 2.6-2.9, and the transverse stretching ratio is 2.9-3.4.
8. A biaxial stretching process for LCP films according to claim 4 wherein: the latent solvent is any one of dimethylformamide, dimethyl phthalate, propylene carbonate and ethylene nitrate.
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| CN202111051811.0A CN113771346A (en) | 2021-09-08 | 2021-09-08 | Biaxial extension process for LCP (liquid Crystal Polymer) film |
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| CN202111051811.0A CN113771346A (en) | 2021-09-08 | 2021-09-08 | Biaxial extension process for LCP (liquid Crystal Polymer) film |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101175799A (en) * | 2005-05-17 | 2008-05-07 | 伊士曼化工公司 | Conductively coated substrates derived from biaxially-oriented and heat-set polyester film |
| CN107592873A (en) * | 2015-05-07 | 2018-01-16 | 杜邦帝人薄膜美国有限合伙公司 | Polyester film with electrical insulating property and thermal conduction characteristic |
| CN110997293A (en) * | 2017-08-17 | 2020-04-10 | 株式会社Lg化学 | Method for post-treating polymer electrolyte membrane |
| CN113302056A (en) * | 2019-01-17 | 2021-08-24 | Sk化学株式会社 | Polyester film and method for producing same |
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2021
- 2021-09-08 CN CN202111051811.0A patent/CN113771346A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101175799A (en) * | 2005-05-17 | 2008-05-07 | 伊士曼化工公司 | Conductively coated substrates derived from biaxially-oriented and heat-set polyester film |
| CN107592873A (en) * | 2015-05-07 | 2018-01-16 | 杜邦帝人薄膜美国有限合伙公司 | Polyester film with electrical insulating property and thermal conduction characteristic |
| CN110997293A (en) * | 2017-08-17 | 2020-04-10 | 株式会社Lg化学 | Method for post-treating polymer electrolyte membrane |
| CN113302056A (en) * | 2019-01-17 | 2021-08-24 | Sk化学株式会社 | Polyester film and method for producing same |
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