DOUBLE-WALL PLASTIC PRODUCE CONTAINER HAVING VENTILATION HOLES THEREIN, AND MOLD FOR THE MANUFACTURE THEREOF

摘要

In this ventilated double-wall plastic container, each hole structure has acentral hole surrounded by a solid flange extending along the inside wallof the double-wall structure. The hole structure also has a spacer portionconnecting the solid flange to the outside wall of the double-wall structure.The wall segments of the hole structure between the spacer portion and theflange and between the spacer portion and the outside wall of the containerdefine angles that are either obtuse angles or right angles. In anotheraspect, the mold for manufacturing the double-wall container has spaced--apartinside and outside metal walls, a plurality of openings in the outsidemetal wall, and hole-forming inserts mounted in the openings andprojecting toward the inside wall. A projecting surface on each of thehole--forming inserts defines with the inside wall a space of even thicknesssurrounding a pin at the centre of the insert.