| 摘要 |
<p>A method and apparatus for melting and conveying plasticated materials by independently developing an initial melt film which is necessary for proper conveying of the material. The apparatus includes a barrel (11) having a cylindrical bore (13) therethrough, a shaft (39) rotatable in said bore which has a substantially circular cross-section, the shaft (39) and bore (13) defining a feed section (106), a metering section (112) and a transition section (109) between the feed and metering sections. The shaft is provided with a helical first channel means (56) intergral with the shaft (39) for conveying said plasticated material in a downstream direction (28) through the feed section (106), the transition section (109), and the metering section (112) when the shaft (39) is rotated. A helical second channel means (68) for producing an initial melt film is provided integral with the shaft (39) for subjecting the material in the second channel means (68) to high initial shear rates to rapidly form a melted film of plasticated material in proximity to a point of commencement (103) of the feed section (106). The second channel means (68) terminates at a point of beginning (108) of the transition section (109) whereupon the first channel means (56) has a step (126) through the transition section (109) which step (126) disappears before a point of beginning (111) of the metering section.</p> |
