also: かみつつ
noun
paper tube; cardboard tube
A cylindrical tube made of paper or cardboard, such as a core from a roll of paper towels or toilet paper, or a craft tube.
See also: 紙管
トイレットペーパーの紙筒で工作をした。
I made a craft using a toilet paper tube.
紙筒に布を巻いて芯にした。
I wrapped cloth around a cardboard tube to use as a core.
Irregular kana usage variant; less common than かみづつ.
紙管 is a more technical term for a paper tube, often used in industrial contexts, while 紙筒 is a common, everyday word.
Compound of 紙 (kami, 'paper') and 筒 (tsutsu, 'tube'). The reading かみづつ is a standard rendaku form.