| 摘要 |
PROBLEM TO BE SOLVED: To provide a mandrel for manufacturing a foam sheet which is capable of easily changing the sheet width, and an apparatus and a method for manufacturing a polyolefin type resin foam sheet using the same. SOLUTION: In the mandrel for manufacturing the foam sheet in which molten mixture of a resin and foaming agent melted and mixed in an extruding machine is extruded and foamed in a low-pressure area through a die mounted on the extruding machine, intermediate foam obtained by the foaming is stretched along an outer surface of the mandrel to manufacture the polyolefin type resin foam sheet, respective areas of at least a front portion, a middle portion and a rear portion of the mandrel are successively formed from the upstream side to the downstream side in the foam sheet flowing direction, and the middle portion includes a mandrel body having a gas feeding means for blowing gas to an inner surface side of the intermediate foam, and an expanded ring to be attachably/detachably fixed to an outer surface of one or both of the front portion and the rear portion of the mandrel body. COPYRIGHT: (C)2011,JPO&INPIT |
