Method and apparatus for manufacturing packaging items or parts thereof as well as packaging items and parts thereof manufactured according to the method

摘要

PCT No. PCT/IB96/00826 Sec. 371 Date Oct. 5, 1998 Sec. 102(e) Date Oct. 5, 1998 PCT Filed Aug. 22, 1996 PCT Pub. No. WO97/09165 PCT Pub. Date Mar. 13, 1997The inventive method relates to manufacturing of thermoformed packaging items or parts thereof having a non-uniform wall thickness and containing at least one layer with a specific function which at least one layer needs for this function a specific minimum thickness. In a first method step a multilayer film material (10) containing the layer with the specific function is produced, e.g. by coextrusion. In a second method step a thermoformable blank (30) is produced by injection molding onto the multilayer film material (10) a substantially flat injection molded part (21) with thicker and thinner portions. In a third method step the blank (30) is thermoformed into the packaging item or part thereof or into an item (40) from which the packaging item (50) is produced in further steps. Preferably the multilayer film (10) is a quasi endless band and is fed as such through an injection molding apparatus whereby a quasi endless band (20) of blanks is produced and either the blanks (30) or the thermoformed items (40 or 50) are punched out of the band. One example of an item produceable by the inventive method is the top part of a plastic bottle consisting of a middle cylinder part of the top- and bottom part.