Methods and apparatus for injection and manufacture of molded components with vacuum assist
A molding process according to one embodiment of the present disclosure includes injecting a first molding material into a mold cavity of a mold, the mold cavity formed by at least a mold cavity portion of a first platen and a second platen when the first platen is in contact with the second platen; opening the mold by separating the first and second platens; placing a second molding material at the first molding material while the first molding material remains with the first platen or the second platen; sealing a space between the first and second platens; removing a gas from the space while the space is sealed; and closing the mold while the space is sealed.
1 . A molding system comprising:
a mold, the mold comprising a first platen, a second platen and a mold cavity, the mold cavity formed by at least a mold cavity portion of a first platen and a second platen when the first platen is in contact with the second platen;
a sealing device that is configured to seal a space between the first and second platens;
a gas remover that is configured to remove a gas from the space between the first and second platens while the space is sealed; and
an overflow channel formed within the first platen, the overflow channel being separate from the mold cavity; and
a tunneling injection channel formed in the first platen and having a first end and a second end, the first end opening on one side of the overflow channel, the second end opening in the mold cavity portion.
2 . The molding system of claim 1 ,
wherein the overflow channel at least partially surrounds the mold cavity portion of the first platen.
3 . The molding system of claim 1 ,
wherein the overflow channel is continuous and entirely surrounds the mold cavity portion of the first platen.
4 . The molding system of claim 3 , the tunneling injection channel extending completely underneath of, and without interrupting, the continuous overflow channel.
5 . The molding system of claim 3 , the tunneling injection channel comprising a conical portion tapering from the first end toward the second end.
6 . The molding system of claim 5 , wherein the conical portion is a first conical portion, the tunneling injection channel further comprising a second conical portion tapering from the second end toward the first end.
7 . The molding system of claim 3 , the tunneling injection channel comprising a conical portion tapering from the second end toward the first end.
8 . The molding system of claim 2 , further comprising an opening extending between a perimeter of the mold cavity and the overflow channel when the first platen is in contact with the second platen, wherein the perimeter alternates between portions where the opening exists, and portions where the opening does not exist.
9 . The molding system of claim 1 , wherein the sealing device comprises a gasket protruding inwardly from a wall of the first or second platen.
10 . The molding system of claim 9 , wherein the gasket encircles an inner perimeter of the wall of the first or second platen.
11 . The molding system of claim 1 , wherein the sealing device comprises a gasket protruding outwardly from a wall of the first or second platen.
12 . The molding system of claim 11 , wherein the gasket encircles an outer perimeter of the wall of the first or second platen.
13 . The molding system of claim 1 , wherein the sealing device comprises a frame that is coupled to at least two gasket rings.
14 . The molding system of claim 13 , wherein the at least two gasket rings comprise silicon.
15 . The molding system of claim 1 , wherein at least one of the first platen and the second platen comprises a selective blocking element configured to selectively block an injection channel in the mold.
16 . The molding system of claim 15 , wherein the selective blocking element is mechanically actuated.