| 摘要 |
PURPOSE:To make laminated sheet molten resin discharge through a mouth piece at about uniform thikness extending over the whole with, by a method wherein fluidity of molten resin in a widthward direction of a sheet is made to balance by making a gap of a slitlike state passage on both side parts of a base sheet layer of an inner layer large. CONSTITUTION:Widths of lead-out paths 32b, 32c are narrower than that of a lead-out path 32a for a base sheet 34 and the lead-out path 32a is protruded on both sides of the widthward direction than the lead-out paths 32b, 32c, at a confluent part 37. Molten resin for laminated sheet layers 35a, 35b which is led through the lead-out paths 32b, 32c is the resin whose viscosity is lower than that for the base sheet 34. As for a gap of the slitlike passage 33 at the confluent part 37, a gap l of a passage 33 part corresponding to a part wherein the lead-out paths 32b, 32c on both sides of a gap m do not join is set large to the gap m of the passage 33 part corresponding to widths of the lead-out paths 32b, 32c. As for the slitlike passage 33, it is desirable to reduce also the part wherein the passage gap is l up to m. |
