| 摘要 |
<p>PURPOSE:To prevent thermal decomposition and burn of melted resin due to stay in a channel and to mold a vessel containing high barrier raw material by shortening the channel. CONSTITUTION:A method and an apparatus for extrusion molding a multilayer parison and a vessel using the same parison use raw materials 5a, 17a, 18a, 20a supplied through cylinders 5A, 17A, 18A, 20A guided with the parison 30 made of the main raw material 5a, adhesive raw materials 17a, 18a and barrier raw material 20a extruded through annular nozzles 12, 13, 14 and a main raw material channel 4 thereby to obtain the parison and the vessel of high quality by preventing thermal decomposition and burn by omitting retention in a resin channel.</p> |
