Abstract: A reducing agent removal line comprises a heat exchanger, an air supply line and a cleaning liquid supply line. The cleaning liquid supply line feeds cleaning liquid into a first passage chamber. The air supply line supplies mixed air of after-drying air containing high-melting point additive and additive containing air containing low-melting point additive into the first passage chamber. Due to contact between the mixed air and a heat-exchanging element, a mixture material containing the high-melting point additive is precipitated from the mixed air. Since melting point MP1 of the high-melting point additive in the mixed air can be controlled to be lower than a temperature of the cleaning liquid by changing a mixture ratio M, the cleaning liquid contacts and dissolves the mixture material in the mixed air.

Abstract: A polymer film producing apparatus has a moving support on which dope containing polymer and solvent is cast to form a cast film. The cast film is stripped from the support to obtain a polymer film containing the solvent, and the polymer film is dried. A first gas flow duct has gas nozzles for causing a first dry gas to flow toward the cast film. A second gas flow duct has a gas outlet disposed downstream from the gas nozzles, and positioned higher than a height of the gas nozzles relative to the support, for causing a second dry gas to flow toward the cast film in a moving direction of the support. Furthermore, the first gas flow duct includes a gas blow wall for defining the first flow path by opposing to the support. The gas blow wall has the gas nozzles.

Abstract: A nozzle (55b) is disposed on a bottom (55a) of an air duct (55), and a drying air (56) is fed out from a nozzle (55b) toward a casting film (69). A data of a wind speed of the drying air (56) is input on a key board (100) to a controller (58), in which a height H of the air duct (55) from a casting belt (46) is calculated from the input wind velocity V. On the basis of the calculated height H, the controller (58) drives a shift device (102) to shift the air duct (55) up- and downwardly, such that the height H may be in the range of 20 mm to 300 mm.

Abstract: A dope made from TAC, additives and solvent is cast onto a belt to form a casting film. When having self-supporting property, the casting film is peeled from the belt as a wet film (120) and transported into a tenter dryer (17). The wet film (120) is stretched in its widthwise direction in a stretch area (131) and relaxed in the widthwise direction in a relaxation area (132). When a stretch rate of the width of the wet film (120) after being held for 0.

Abstract: A dope is prepared from TAC, mixed solvent and additive. The dope is cast from a casting die (31) onto a belt (34). A casting film (69) is formed on the belt (34). The casting film (69) is carried in association with movement of the belt 34. A rapid-drying blower unit (73) is disposed at a position, which is separated from a labyrinth seal (50) by 1000 mm in a downstream direction. Dry air (57) is applied to the casting film from a nozzle (73a) of the blower unit (73). Velocity of the dry air (57) is adjusted to 12 m/s. An initial film (69a) is formed on the casting film (69). The entire casting film (69) is dried after forming the initial film (69a). The casting film (69) is peeled from the belt (34) after having a self-supporting property. The casting film is heated and stretched in a tenter drier and is dried in a drying chamber.

Abstract: A reducing agent removal line comprises a heat exchanger, an air supply line and a cleaning liquid supply line. The cleaning liquid supply line feeds cleaning liquid into a first passage chamber. The air supply line supplies mixed air of after-drying air containing high-melting point additive and additive containing air containing low-melting point additive into the first passage chamber. Due to contact between the mixed air and a heat-exchanging element, a mixture material containing the high-melting point additive is precipitated from the mixed air. Since melting point MP1 of the high-melting point additive in the mixed air can be controlled to be lower than a temperature of the cleaning liquid by changing a mixture ratio M, the cleaning liquid contacts and dissolves the mixture material in the mixed air.

Abstract: A polymer film producing apparatus has a moving support on which dope containing polymer and solvent is cast to form a cast film. The cast film is stripped from the support to obtain a polymer film containing the solvent, and the polymer film is dried. A first gas flow duct has gas nozzles for causing a first dry gas to flow toward the cast film. A second gas flow duct has a gas outlet disposed downstream from the gas nozzles, and positioned higher than a height of the gas nozzles relative to the support, for causing a second dry gas to flow toward the cast film in a moving direction of the support. Furthermore, the first gas flow duct includes a gas blow wall for defining the first flow path by opposing to the support. The gas blow wall has the gas nozzles.

Abstract: In order to produce a polarizing filter, first and second protective films are adhered to respective surfaces of a polarized film. When M1, M2 are determined as respective coefficients of expansion by water absorption of the first and second protective films, the coefficients of expansion satisfy a formula, 0.65·M1<M2<1.55·M1. A difference of the thickness between the first and second protective films is more than 2 ?m and less than 100 ?m. Further, the first and second protective films are formed of cellulose triacetate, and the polarized film is formed of polyvinylalcohol series. Thus the polarizing filter has no curl to be formed after the protective films are adhered to the polarized film.

Abstract: A method for stretching an optical polymer film is described, which comprises allowing a locus L1 of the holding means from a substantial holding Initiation point to a substantial holding release point on one edge of the polymer film, a locus L2 of the holding means from a substantial holding initiation point to a substantial holding release point on the other edge of the polymer film, and a distance W between the two substantial holding release points to satisfy the following equation (1), maintaining the supporting property of the polymer film, stretching the film in the presence of a state in which the volatile content is 5% or more, and then, decreasing the volatile content while shrinking the film: |L2?L1|>0.4W.

Abstract: The present invention relates to a process for producing a cellulose acylate film, and an optical compensation sheet, a polarizing plate, and an image display device employing the cellulose acylate film. The process for producing a cellulose acylate film of the present invention is characterized by including a step of preparing a cellulose acylate solution containing 0.01 to 20 parts by weight of an aromatic compound having at least two aromatic rings relative to 100 parts by weight of a cellulose acylate, a step of casting, and a step of blowing a gas on the cast cellulose acylate solution at an effective wind speed of at least 10 m/min during a first half of drying prior to peel-off.

Abstract: In order to produce a polarizing filter, first and second protective films are adhered to respective surfaces of a polarized film. When M1, M2 are determined as respective coefficients of expansion by water absorption of the first and second protective films, the coefficients of expansion satisfy a formula, 0.65·M1<M2<1.55·M1. A difference of the thickness between the first and second protective films is more than 2 ?m and less than 100 ?m. Further, the first and second protective films are formed of cellulose triacetate, and the polarized film is formed of polyvinylalcohol series. Thus the polarizing filter has no curl to be formed after the protective films are adhered to the polarized film.

Abstract: A dope containing Tac is cast onto a belt. When having self-supporting properties, the dope is peeled as a wet film from the belt, and transported to a tenter dryer. In an entrance section, a preheating is made and in an stretching section a stretching is made at a stretch speed Y(%/min). In a relaxation section, the width of the film was becomes shorter, and in the exit section, the width was kept to be uniform and transported toward the tenter dryer. A difference of a content of the remaining solvent between the stretching starting point and a relaxation end position is X. In this case, the following formula is satisfied to reduce the generation of bowing phenomena. Thus the axial diffractive of a slow axis can be reduced.

Abstract: The cellulose acylate film has a lower degree of curling in water and is excellent in its processability, as a film suitable for manufacturing a polarizing plate. At least one portion of roll drying parts of a film manufacturing apparatus has a high-temperature drying zone where drying air having a temperature of 115° C. or more is blown on the film to dry thereof. The drying air is supplied by blowing it: (1) on a substrate side of the film; (2) on an air side of the film such that the drying air velocity becomes 3 m/s or less; and (3) on both sides of the film. The manufactured film has a curl radius of 25 mm or more when the film is dipped in water at 25° C. and a ratio between a plasticizer content of the substrate side and a plasticizer content of the air side from 1.2 to 2.0.

Abstract: A method for stretching an optical polymer film is described, which comprises allowing a locus L1 of the holding means from a substantial holding initiation point to a substantial holding release point on one edge of the polymer film, a locus L2 of the holding means from a substantial holding initiation point to a substantial holding release point on the other edge of the polymer film, and a distance W between the two substantial holding release points to satisfy the following equation (1), maintaining the supporting property of the polymer film, stretching the film in the presence of a state in which the volatile content is 5% or more, and then, decreasing the volatile content while shrinking the film: |L2−L1|>0.

Abstract: A method for stretching an optical polymer film is described, which comprises allowing a locus L1 of the holding means from a substantial holding Initiation point to a substantial holding release point on one edge of the polymer film, a locus L2 of the holding means from a substantial holding initiation point to a substantial holding release point on the other edge of the polymer film, and a distance W between the two substantial holding release points to satisfy the following equation (1), maintaining the supporting property of the polymer film, stretching the film in the presence of a state in which the volatile content is 5% or more, and then, decreasing the volatile content while shrinking the film:

Abstract: A cellulose triacetate film having a film thickness from 115 to 135 &mgr;m and a Z value of 0.3 or less wherein the Z value is a slope (g/° C.) obtained by plotting tear strength against temperature in a range between −20° C. and +23° C., and a process for producing the same characterized by drying cast film using drying wind having a temperature T° C. which satisfies T0−15<T<T0, wherein temperature T° C. of the drying wind is in an arbitrary volatile component region and the temperature T0° C. is at an inflexion point obtained by plotting tear strength W of the cellulose triacetate film after drying at the temperature T° C. against drying wind temperature. The film is excellent in low temperature strength, and resistant to breakage of perforations during rewinding under low temperature conditions.

Abstract: The cellulose acylate film has a lower degree of curling in water and is excellent in its processability, as a film suitable for manufacturing a polarizing plate. At least one portion of roll drying parts of a film manufacturing apparatus has a high-temperature drying zone where drying air having a temperature of 115° C. or more is blown on the film to dry thereof. In the high-temperature drying zone, the drying air is supplied by any of the methods as follows: (1) the drying air is blown on a substrate side of the film; (2) the drying air is blown on an air side of the film such that the drying air velocity becomes 3 m/s or less; and (3) the drying air is blown on both sides of the film. The film thus manufactured is provided with characteristics that a curvature radius of curling when the film is dipped in water at 25° C.

Abstract: A method for stretching an optical polymer film is described, which comprises allowing a locus L1 of the holding means from a substantial holding initiation point to a substantial holding release point on one edge of the polymer film, a locus L2 of the holding means from a substantial holding initiation point to a substantial holding release point on the other edge of the polymer film, and a distance W between the two substantial holding release points to satisfy the following equation (1), maintaining the supporting property of the polymer film, stretching the film in the presence of a state in which the volatile content is 5% or more, and then, decreasing the volatile content while shrinking the film: