Abstract: A method for sealing sheets, the method comprising the steps of passing the sheets through a space between an opposing roller and a first seal roller that is opposingly provided to the opposing roller to seal the sheets and passing the sheets through a space between the opposing roller and a second seal roller that is opposingly provided to the opposing roller to seal the sheets. A heat sealing apparatus comprising a plurality of seal rollers having a plurality of seal blades and an opposing roller oppposingly provided to the plurality of sea rollers, wherein sheets are passed through spaces between the plurality of seal rollers and the opposing roller to be sealed.

Abstract: A rotation device includes: an endless guide; and a plurality of moving sections that move while being guided by the guide, wherein an interval between the moving sections can be changed.

Abstract: A method for manufacturing a disposable worn article of the present invention includes: a first step of applying an adhesive on at least one of a first web and a second web; a second step of sandwiching an elastic member between the first and second webs and combining the first and second webs and the elastic member together, thereby producing a combined web; and a third step of melting a portion of at least one of the first and second webs and a portion of the elastic member, thereby reducing a shrinking force of the elastic member in the melted portion.