发明授权
US4733452A Production of jackets for flexible magnetic disks, and apparatus for this purpose 失效
制造用于柔性磁盘的夹克,以及用于此目的的装置

Production of jackets for flexible magnetic disks, and apparatus for
this purpose
摘要:
The jacket blanks punched out from a film web are folded to give jackets and then closed by spot welding with the aid of a wavy resistance belt, the welding temperature being produced for a short time by means of a current pulse in the resistance belt.
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