| 摘要 |
PURPOSE:To eliminate included volatile substances without lowering the extrusion ability of an extruder or causing the clogging or the like, by premixing a melted thermoplastic resin and water, feeding the mixture to a vent extruder, and exhausting a gas mixture through a vent port. CONSTITUTION:The melted thermoplastic resin is led from a polymerizing tank 1 by a gear pump 2, and water in a quantity of about 0.1-10wt% of the resin is added from a water inlet 7. Then the mixture is introduced into an element 3 with a passage having an ability for mixing such as a static mixing unit, a high mixer or the like so that the resin and water may be homogeneously mixed. Then the mixture of resin and water is introduced into a vent extruder 4 where a gas mixture including water and the volatile substances such as unreacted monomers, solvents, etc. contained in the resin is evacuated via the vent port 5 to be eliminated, and the resin is extruded from the extruder head to obtain a resin strand 9. |
