Injection molding device comprising movable strippers

A molding device for manufacturing at least a plastic hollow part (40) by injection molding comprising

• 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), the first mold cavity (13) having a first length (L1);
• 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), the second mold cavity (23) having a second length (L2);
• at least a demolding station (3) for demolding the plastic hollow part (40);
• wherein a core (15) is transferable from the first molding station (1) to the second molding station (2) and/or to the demolding station (3), so that the core is locatable at least partially inside the first and second mold cavities (13, 23) thereby forming a part of the first and second mold cavities (13, 23), the core having a longitudinal axis and a first end (16), wherein the first length (L1) and the second length (L2) are parallel to the longitudinal axis;
• wherein at least one stripper (30) is slidingly arranged on the core around an outer surface (17) of the core (15) for a sliding movement along the longitudinal axis whereby an inner surface of the stripper contacts the outer surface of the core, the stripper having a first end (34) and a second end spaced from the first end along the longitudinal axis so that the first end of the stripper (34) is disposed between the first end (16) of the core (15) and the second end of the stripper, the first end (34) of the stripper being structured and configured to face, in a direction parallel to the longitudinal axis, the plastic hollow part in its entirety;
• wherein the stripper (30) is arranged on the core (15) in a passive position at the first molding station (1), wherein a first distance (D1) is formed between the first end of the core and the first end of the stripper, 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 on the core (15) in a molding position at the second molding station (2) so that the second length (L2) of the second mold cavity (23) extends from the first end (34) of the stripper (30) towards the first end (16) of the core (15), wherein a second distance (D2) is formed between the first end (16) of the core (15) and the first end (34) of the stripper (30), wherein at least a part of the first end (16) of the core (15) is located inside the second mold cavity (23) and the first end (34) of 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 on the core (15) in a demolding position at the demolding station (3), wherein a third distance (D3) is formed between the first end (16) of the core (15) and the first end (34) of the stripper (30) when the core (15) is positioned outside of the first and second mold cavities (13, 23);
• wherein the stripper (30) is structured and configured to slidingly move, along and in contact with the core (15), between the passive position, the molding position, and the demolding position;
• and
• wherein, the first distance (D1), the second distance (D2), and the third distance (D3) are parallel to the longitudinal axis and wherein the first distance (D1) is larger than the second distance (D2) and the second distance (D2) is larger than the third distance (D3).