Gary P Engen

US Patent:

20040096608, May 20, 2004

Filed:

Nov 15, 2002

Appl. No.:

10/298042

Inventors:

Nathan King - Inver Grove Heights MN, US
Jennifer Schwiebert - Maple Grove MN, US
John Morgan - Cedar MN, US
Gary Engen - Mounds View MN, US

Assignee:

Solar Plastics, Inc.

International Classification:

B29C041/04
B29C041/20

US Classification:

428/035700, 264/255000, 264/311000, 249/111000, 425/425000, 425/435000

Abstract:

A multi-layer rotational-molded plastic article has an area, such as a sight line for viewing content levels, where an inside layer protrudes through the outside layer and may be bonded to it. A first flowable material such as plastic resin is introduced into a mold having an insulating member extending through an aperture or slot into the mold. The mold is rotated and heated to less than full cure. The insulating member is removed, a second, transparent flowable material is introduced into the mold, and a cover member replaces the insulating member. The mold is rotated and heated to cure both resins, and only then cooled and opened.