Abstract: An activated carbon producing system includes a carbonizer for carbonizing cellulose triacetate as cellulose acylate to create carbonized material. A pulverizer pulverizes the carbonized material to obtain granules. An activation device activates the granules to create activated carbon. The activated carbon producing system includes a dispenser for supplying the cellulose triacetate at a plural number of times. A heating furnace is operated at each time after the dispenser operates, for thermally decomposing the cellulose triacetate from the dispenser, to obtain the carbonized material by carbonization. The pulverizer pulverizes the carbonized material in a size equal to or more than 2 mm and equal to or less than 20 mm. Temperature of the heating furnace is equal to or higher than 300 deg. C. and equal to or lower than 600 deg. C.

Abstract: An activated carbon producing system includes a heating furnace for thermally decomposing multi-layer film including a polyvinyl alcohol layer and cellulose triacetate (TAC) layers formed on surfaces of the polyvinyl alcohol layer, to produce carbonized material by carbonization. An activation device activates the carbonized material with heat, to produce activated carbon by forming fine pores therein. A burner assembly combusts acetic acid contained in pyrolysis gas created by thermal decomposition in the heating furnace, to produce gaseous carbon dioxide. A first heat exchanger exchanges heat between the pyrolysis gas from the burner assembly and heat exchange medium, to provide the heating furnace with the heat of the heat exchange medium. A washer absorbs gaseous carbon dioxide contained in the pyrolysis gas from the first heat exchanger by use of alkaline absorption solution. If the multi-layer film contains additive, the washer washes away the combusted additive.

Abstract: An activated carbon producing system includes a carbonizer for carbonizing cellulose triacetate as cellulose acylate to create carbonized material. A pulverizer pulverizes the carbonized material to obtain granules. An activation device activates the granules to create activated carbon. The activated carbon producing system includes a dispenser for supplying the cellulose triacetate at a plural number of times. A heating furnace is operated at each time after the dispenser operates, for thermally decomposing the cellulose triacetate from the dispenser, to obtain the carbonized material by carbonization. The pulverizer pulverizes the carbonized material in a size equal to or more than 2 mm and equal to or less than 20 mm. Temperature of the heating furnace is equal to or higher than 300 deg. C. and equal to or lower than 600 deg. C.

Abstract: An activated carbon producing system includes a heating furnace for thermally decomposing multi-layer film including a polyvinyl alcohol layer and cellulose triacetate (TAC) layers formed on surfaces of the polyvinyl alcohol layer, to produce carbonized material by carbonization. An activation device activates the carbonized material with heat, to produce activated carbon by forming fine pores therein. A burner assembly combusts acetic acid contained in pyrolysis gas created by thermal decomposition in the heating furnace, to produce gaseous carbon dioxide. A first heat exchanger exchanges heat between the pyrolysis gas from the burner assembly and heat exchange medium, to provide the heating furnace with the heat of the heat exchange medium. A washer absorbs gaseous carbon dioxide contained in the pyrolysis gas from the first heat exchanger by use of alkaline absorption solution. If the multi-layer film contains additive, the washer washes away the combusted additive.

Abstract: A casting film (80) having a base layer and one outer layer on the base layer is formed by a co-casting. Viscosity of an outer layer dope was at most 40 Pa·s. Just after formation of the casting film (80), the drying air is fed out from an outlet (82a) opening to a belt (73). The temperature and the static pressure are respectively predetermined valued 50-160° C. and 50 Pa-200 Pa. The first outlet is partitioned by partitioning members, and meshed plates are attached to the partitions confronting to both side edge portions of the casting film (80). Another drying air is fed out from an outlet (83a) in a running direction of the belt 73. The temperature and the wind speed are respectively predetermined valued 50° C.-160° C. and 5 m/s-20 m/s. The occurrence of unevenness and foaming was reduced and a film excellent in planarity was produced.

Abstract: A casting die includes lip plates and inner deckle plates, each of which has a contact face. The contact faces form an outlet of the casing die. A distance between a ridge of the lip plate and that of the inner deckle plate is at most 9 ?m. Further, nozzles are disposed so as to be close to the outlet. A casting dope is discharged from the outlet to a support, so as to form a dope bead between the outlet and a periphery of the support. The nozzles supply a solution to side edges of the dope bead.

Abstract: A casting die includes lip plates and inner deckle plates, each of which has a contact face. The contact faces form an outlet of the casing die. A distance between a ridge of the lip plate and that of the inner deckle plate is at most 9 ?m. Further, nozzles are disposed so as to be close to the outlet. A periphery of a support runs at more than 50 m/min. A casting dope is discharged from the outlet to the support, so as to form a dope bead between the outlet and the periphery. A decompression chamber decompresses in a rear face side from the dope bead.

Abstract: A dope is cast onto a drum whose surface is cooled, so as to form a casting film. After the peeling of the casting film, a cleaning gas containing dry ice particles is applied to a periphery of the casting drum with use of a drum cleaning unit. Thus the dry ice particles collide to the periphery of the casting drum, and the colliding energy is effective of removing from the periphery an organic material adhered on the casting drum. The organic material mainly contains aliphatic acid, aliphatic acid ester and metal salt of aliphatic acid. Before the increase of the amount of the organic material, it is removed and therefore isn't transmitted onto the surface of the casting film. Thus a high quality film having no optical unevenness is produced without the decrease of the productivity.