초록 ▼

An apparatus (10) for molding a thin-wall plastic shell includes a powder box (12) and a mold box (14). The powder box (12) is positioned to an operative position wherein an opening (18) in the powder box (12) is brought in proximity to the mold surface (20) of the mold. A contoured selective charge

An apparatus (10) for molding a thin-wall plastic shell includes a powder box (12) and a mold box (14). The powder box (12) is positioned to an operative position wherein an opening (18) in the powder box (12) is brought in proximity to the mold surface (20) of the mold. A contoured selective charge application panel (36) has a gasket (30) about the end thereof and the selective charge application panel (36) is extended vertically from the opening (18) at variable heights to perfect a sealed surface at the opening (18) and the periphery (22) of the mold surface (20) to mask vertically extending waste surfaces (14a, 14b).

대표청구항 ▼

A process for manufacturing a thin-walled plastic shell (21) using a mold assembly (10) including a mold box (14) provided with a deeply recessed mold surface (20) surrounded by a plurality of vertical waste surfaces and a horizontal runoff surface and including a powder box (12) containing powder r

A process for manufacturing a thin-walled plastic shell (21) using a mold assembly (10) including a mold box (14) provided with a deeply recessed mold surface (20) surrounded by a plurality of vertical waste surfaces and a horizontal runoff surface and including a powder box (12) containing powder resin and having an opening (18) surrounded by a contoured selective charge application panel (36) provided with a variable height gasket (30) and vertical side portions (40a, 40b, 40c) offset from said gasket (30), said method including the steps of: heating said mold box (14) so as to provide said mold surface (20) with a uniform temperature; combining said mold box and said powder box by positioning said mold surface (20) relative to said opening (18) so that said opening (18) and said mold surface are in proximity to each other and said vertical side portions of said panel are located within said mold box (14) and cooperate with said gasket (30) to mask said plurality of vertical waste surfaces of said mold box (14) while simultaneously causing said gasket (30) to engage said horizontal runoff surface of said mold box (14) at variable heights to form a variable height narrow width band portion (28) along said horizontal runoff surface of said mold box (14) that allows said powder resin to be deposited adjacent said mold surface (20) to form a peripheral flange (22) on said plastic shell (21) for assisting in removal of said plastic shell from said mold box (14); and positioning said combined powder box (12) and mold box (14) so that said powder resin is deposited onto said variable height narrow width band portion and on said mold surface (20) of said mold box to form said thin-walled plastic shell (21) with said peripheral flange thereon while preventing deposition of said powder resin as waste on said masked vertical waste surfaces of said mold box.