| 摘要 |
<p>Battery boxy and recessed lid are secured by positioning box and lid with opposed dies and putting a heater in between to contact an internal shoulder on the lid, the heater being recessed so that id does not contact the wall of the lid adjacent the shoulder. Pref. the wall forms with the upper tapered portion of the box wall a tapered recess into which molten material flow when the lid and box are pressed together after the heating. Polypropylene is pref.</p> |
