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US 5,968,564 AGranted
Injection molding apparatus
AssigneeKord Products Limited
InventorsRalph William Welsh, Geoffrey Walker
Life of this patent
Estimating the term…
Abstract
A molded container top 140 has engravings 145 formed by an embossing 108. The core 120 withdrawn from the cavity 102 and a retaining ring 110 holds the hot molded part 140 in the cavity 102. The molded part 140 shrinks away from the cavity 102 and is pushed out of the cavity 102 by an ejector 105. The part 140 has no witness lines on its circumferential skirt 142.
Claims11
A molding apparatus comprising:
- a cavity member having a first circular end surface with a first circumferential skirt having a first inside diameter;
- a core member spaced from said cavity member and comprising a second circular end surface with a second circumferential skirt having a second outside diameter less than the first inside diameter of the first circumferential skirt;
- said cavity member and said core member being aligned along a common axis transverse to the surface of said first and second ends and passing through the center of said first and second circular ends;
- a fluid passage terminating at one of said ends for carrying injection molding compound to a molding volume defined by space between said cavity member and said core member;
- and
- a retaining ring axially aligned with said core and cavity members, surrounding said core member and having a third inner diameter less than said first inner diameter and greater than said second outer diameter,
- wherein the injection molding compound has a predetermined shrinkage and the retaining ring has an inner diameter that is less than the inner diameter of the cavity skirt by an amount not in excess of half the shrinkage of the injected molding compound.
4 more elements
A molding apparatus comprising:
- a cavity member having a first circular end surface with a first circumferential skirt having a first inside diameter;
- a core member spaced from said cavity member and comprising a second circular end surface with a second circumferential skirt having a second outside diameter less than the first inside diameter of the first circumferential skirt;
- said cavity member and said core member being aligned along a common axis transverse to the surface of said first and second ends and passing through the center of said first and second circular ends;
- a fluid passage terminating at one of said ends for carrying injection molding compound to a molding volume defined by space between said cavity member and said core member;
- and
- a retaining ring axially aligned with said core and cavity members, surrounding said core member and having a third inner diameter less than said first inner diameter and greater than said second outer diameter,
- wherein said first circumferential skirt has a substantially seamless surface and is one piece, said second circumferential skirt has a substantially seamless surface and is one piece, and said retaining ring is one piece.
4 more elements
A molding apparatus comprising:
- a cavity member having a first circular end surface with a first circumferential skirt having a first inside diameter;
- a core member spaced from said cavity member and comprising a second circular end surface with a second circumferential skirt having a second outside diameter less than the first inside diameter of the first circumferential skirt;
- said cavity member and said core member being aligned along a common axis transverse to the surface of said first and second ends and passing through the center of said first and second circular ends;
- a fluid passage terminating at one of said ends for carrying injection molding compound to a molding volume defined by space between said cavity member and said core member;
- and
- a retaining ring axially aligned with said core and cavity members, surrounding said core member and having a third inner diameter less than said first inner diameter and greater than said second outer diameter,
- wherein the first circumferential skirt has a cylindrical surface with a design displaced from the surface of the skirt, the injection molding compound has a predetermined shrinkage and the size of the design is less than half of said shrinkage.
4 more elements
A molding apparatus comprising:
- a cavity member having a first circular end surface with a first circumferential skirt having a first inside diameter:
- a core member spaced from said cavity member and comprising a second circular end surface with a second circumferential skirt having a second outside diameter less than the first inside diameter of the first circumferential skirt;
- said cavity member and said core member being aligned alone a common axis transverse to the surface of said first and second ends and passing through the center of said first and second circular ends;
- a fluid passage terminating at one of said ends for carrying injection molding compound to a molding volume defined by space between said cavity member and said core member;
- and
- a retaining ring axially aligned with said core and cavity members, surrounding said core member and having a third inner diameter less than said first inner diameter and greater than said second outer diameter,
- wherein said core further comprises a fluid passage for apply a source of pressurized air on end surface of a molded part.
4 more elements
A molding apparatus comprising:
- a cavity member having a first circular end surface with a first circumferential skirt having a first inside diameter;
- a core member spaced from said cavity member and comprising a second circular end surface with a second circumferential skirt having a second outside diameter less than the first inside diameter of the first circumferential skirt;
- said cavity member and said core member being aligned along a common axis transverse to the surface of said first and second ends and passing through the center of said first and second circular ends;
- a fluid passage terminating at one of said ends for carrying injection molding compound to a molding volume defined by space between said cavity member and said core member;
- and
- a retaining ring axially aligned with said core and cavity members, surrounding said core member and having a third inner diameter less than said first inner diameter and greater than said second outer diameter,
- wherein said core further comprises a piston for bearing against a molded part to urge said core away from said molded end surface.
4 more elements
A molding apparatus comprising:
- a cavity member having a first circular end surface with a first circumferential skirt having a first inside diameter;
- a core member spaced from said cavity member and comprising a second circular end surface with a second circumferential skirt having a second outside diameter less than the first inside diameter of the first circumferential skirt;
- said cavity member and said core member being aligned along a common axis transverse to the surface of said first and second ends and passing through the center of said first and second circular ends;
- a fluid passage terminating at one of said ends for carrying injection molding compound to a molding volume defined by space between said cavity member and said core member;
- and
- a retaining ring axially aligned with said core and cavity members, surrounding said core member and having a third inner diameter less than said first inner diameter and greater than said second outer diameter,
- wherein said core comprises a concentric ejector reciprocally moveable within said cavity to urge a molded part out of said cavity in a direction toward said core.
4 more elements
Dependencies are inferred from the claim text.