Process for producing cellulosic tubular films
A twin screw extruder comprising: a housing having a circular tube section provided with a supply opening and an exhaust opening for a material; a screw rotatably assembled in the circular tube section, conveying the material supplied from the supply opening to the exhaust opening while kneading the material between itself and an inner peripheral surface of the circular tube section, and extruding the material; a feed roller assembled in parallel to and adjacent to the screw near the supply opening, rotating together with the screw, and feeding the material supplied from the supply opening toward the exhaust opening; and a scraper having a scraping part that scrapes the material from the surface of the feed roller, and a guide surface that guides the scraped material to the inner peripheral surface of the circular tube section, wherein the housing has a feed roller support portion that rotatably supports the feed roller and that is assembled so as to make operation of opening/closing the circular tube section performed in such a way that the feed roller moves apart from the screw to open the hollow in the cylinder part.
It is unnecessary to detach the scraper in the cleaning work. Therefore, it is unnecessary to readjust the gap between the tip of the scraping part of the scraper and the surface of the feed roller, so that the work process of the cleaning work is simplified, and the work time can be shortened. A drive mechanism for supporting and rotating the screw may be further provided. The circular tube section is provided so that it can move apart from the drive mechanism in the axial direction of the screw. With such a configuration, by making the circular tube section move apart from the drive mechanism, the screw can be exposed to the outside from the circular tube section. Thus, cleaning such as removal of a material adhered to the outer peripheral surface of the screw and the inner peripheral surface of the circular tube section forming a material conveyance passage is facilitated.
An extruder of the invention includes a housing having a circular tube section provided with a supply opening and an exhaust opening for a material, a screw rotatably assembled in the circular tube section, conveying the material supplied from the supply opening to the exhaust opening while kneading the material between itself and an inner peripheral surface of the circular tube section, and extruding the material, a feed roller assembled in parallel to and adjacent to the screw near the supply opening, rotating together with the screw, and feeding the material supplied from the supply opening toward the exhaust opening, and a scraper having a scraping part that scrapes the material from the surface of the feed roller.