| 摘要 |
<p>A rectangular tray-type carton formed from a blank of plastics-coated board has a peripheral flange for attachment of a closure lid. The flange (28) is formed after the erection of the carton side wall in a punch and die arrangement, by folding down elongate panels carried along the free edges of the side wall (24) and by subsequently joining the panels together at their ends (201) by means of overlapping tabs which are heat-sealed together. In order to ensure that the tabs are in the desired overlapping relation for heat-sealing the uppermost tabs are folded out of the plane of the blank before it enters the punch and die arrangement.</p> |
