PROBLEM TO BE SOLVED: To reduce possibility in which a wound body is suddenly folded or bent in winding of a synthetic resin sheet.SOLUTION: A sheet wound body component metal tube 32 has a tubular metal large diameter part 40 and a tubular metal small diameter part 42. One end of a sheet wound body component metal tube 32 is inserted into an inner space 50 of the metal large diameter part 40. An opening/closing sheet is connected to the metal large diameter part 40. The metal small diameter part 42 is continuous to the metal large diameter part 40. An inner space 52 of the metal small diameter part 42 is communicated to the inner space 50 of the metal large diameter part 40. The outer diameter of the metal small diameter part 42 is smaller than the inner diameter of the metal large diameter part 40. The metal small diameter part 42 is inserted into one end of one end metal tube. The sheet wound body component metal tube 32 has further a large diameter inner periphery coated film part 64 and a communication passage inner periphery coated film part 74 and a small diameter inner periphery coated film part 84. The large diameter inner periphery coated film part 64, the communication passage inner periphery coated film part 74 and the small diameter inner periphery coated film part 84 cover a section from the inner peripheral face of the metal large diameter part 40 to the inner peripheral face of the metal small diameter part 42.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2019,JPO&INPIT【課題】 合成樹脂製シートの巻き付け中に巻付体が突然折れたり曲がったりする可能性を低くする。【解決手段】 シート巻付体構成金属管３２は、管状の金属製大径部４０と管状の金属製小径部４２とを備える。金属製大径部４０の内部空間５０にはシート巻付体構成金属管３２の一端が挿入される。金属製大径部４０に開閉シートが接続される。金属製小径部４２は金属製大径部４０に連なる。金属製小径部４２の内部空間５２は金属製大径部４０の内部空間５０と連通する。金属製小径部４２の外径が金属製大径部４０の内径より小さい。金属製小径部４２は一端金属管の一端に挿入される。シート巻付体構成金属管３２は、大径内周塗膜部６４と連通路内周塗膜部７４と小径内周塗膜部８４とをさらに備える。大径内周塗膜部６４と連通路内周塗膜部７４と小径内周塗膜部８４とは、金属製大径部４０の内周面から金属製小径部４２の内周面までの区間を覆う。【選択図】 図４
