Injection molding device comprising movable strippers
AssigneeBraun GmbH
InventorMarc KUNZ
Life of this patent
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Abstract
A molding device for manufacturing a plastic hollow part by injection molding includes an injection nozzle and first and second molding stations. Each molding station has a first mold including two mold halves forming, respectively, first and second mold cavities, and a core having a first end, which can be at least partially located inside the first and second mold cavities. A first stripper can be arranged on the core in a passive position, spaced from the first end of the core at a first distance; in a molding position, spaced from the first end of the core at a second distance; and in a demolding position, spaced from the first end of the core at a third distance; wherein the first distance is greater than the second distance, and the second distance is greater than the third distance.
Claims15
A molding device for manufacturing at least a plastic hollow part (40) by injection molding comprising p1 at least a first molding station (1) comprising at least a first mold (10) comprising a first mold half (11) and a second mold half (12) forming a first mold cavity (13) for molding a first part (41) of a hollow part (40);
- at least a second molding station (2) comprising at least a second mold (20) comprising a first mold half (21) and a second mold half (22) forming a second mold cavity (23) for molding a second part (42) of the hollow part (40);
- at least a demolding station (3) for demolding the hollow part (40);
- wherein a core (15) which is transferable from the first molding station (1) to the second molding station (2) and/or to the demolding station (3) is locatable at least partially inside the first and second mold cavity (13, 23) thereby forming a part of the first and second mold cavity (13, 23);
- wherein at least one stripper (30) is slidingly arranged around an outer surface (17) of the core (15);
- wherein the stripper (30) is arranged at the core (15) in a passive position spaced from a first end (16) of the core (15) with a first distance (D1) at the first molding station (1), wherein at least a part of the first end (16) of the core (15) is located inside the first mold cavity (13) and the stripper (30) is located outside the first mold cavity (13);
- wherein the stripper (30) is arranged at the core (15) in a molding position spaced from a first end (16) of the core (15) with a second distance (D2) at the second molding station (2), wherein at least a part of the first end (16) of the core (15) is located inside the second mold cavity (23) and the stripper (30) together with the first mold half (21) and the second mold half (22) of the second mold (20) form the second mold cavity (23);
- wherein the stripper (30) is arranged at the core (15) in a demolding position spaced from a first end (16) of the core (15) with a third distance (D3) when the core (15) is positioned outside of the first and second mold cavity (13, 23) at the demolding station (3);
- and
- wherein the first distance (D1) is larger than the second distance (D2) and wherein the second distance (D2) is larger than the third distance (D3).
A method of manufacturing a plastic hollow part (40) by injection molding comprising
- injecting a first plastic material into a first mold cavity (13) onto a core (15) in order to form a first part (41) of a hollow part (40) at a first molding station (1);
- transferring the core (15) together with the first part (41) of the hollow part (40) to a second mold (20) comprising a first mold half (21) and a second mold half (22) and injecting a second plastic material into a second mold cavity (23) onto the first part (41) of the hollow part (40) in order to form a second part (42) of the hollow part (40) at a second molding station (2);
- transferring the core (15) together with the hollow part (40) to a demolding station (3) and removing the hollow part (40) from the core (15);
- wherein the hollow part (40) is removed from the core (15) using a stripper (30) which is arranged at the core (15) and wherein the stripper (30) is located outside the first mold cavity (13) at the first molding station (1) and wherein the stripper (30) forms the second mold cavity (23) together with the first mold half (21) and the second mold half (22) of the second mold (20).
Dependencies are inferred from the claim text.