Film producing apparatus and method of producing film

A film producing apparatus comprising:

• a kneading section configured to knead a polyolefin resin and a film-forming plasticizer to prepare a polyolefin resin solution;
• an extruding section configured to perform extrusion molding of the polyolefin resin solution thus prepared to form a film in a form of a sheet;
• a stretching section configured to stretch the film;
• a cleaning section configured to clean the film;
• and
• a conveying section configured to convey the film from the extruding section to the cleaning section,
• the conveying section causing the film to enter the cleaning section in a state in which the amount of the film-forming plasticizer contained in the film is decreased by not less than 30% to not more than 70% relative to the amount of the film-forming plasticizer contained in the polyolefin resin solution which is equal in volume to the film.

A method of producing a film comprising:

• a first kneading step comprising kneading a first polyolefin resin and a first film-forming plasticizer to prepare a first polyolefin resin solution;
• an extruding step comprising performing extrusion molding of the first polyolefin resin solution thus prepared to form a film in a form of a sheet;
• a stretching step comprising stretching the film;
• a cleaning step comprising cleaning the film;
• and
• a plasticizer separating step comprising separating portion of the first film-forming plasticizer from the film at a stage previous to the cleaning step.

A method of producing a film comprising:

• a first kneading step comprising kneading a first polyolefin resin and a first film-forming plasticizer to prepare a first polyolefin resin solution;
• an extruding step comprising performing extrusion molding of the first polyolefin resin solution thus prepared to form a film in a form of a sheet;
• a stretching step comprising stretching the film;
• a cleaning step comprising cleaning the film;
• and
• a conveying step comprising conveying the film from an extruding section, in which the extruding step is performed, to a cleaning section, in which the cleaning step is performed,
• the conveying step comprising causing the film to enter the cleaning section in a state in which the amount of the first film-forming plasticizer contained in the film is decreased by not less than 30% to not more than 70% relative to the amount of the first film-forming plasticizer contained in the first polyolefin resin solution which is equal in volume to the film.