Forming head with integrated seal pin/stretch rod and various sealing geometries
AssigneeDiscma AG
InventorG. David LISCH
Life of this patent
Estimating the term…
Abstract
A hydraulic blow molding system for forming a container from a preform by injecting a liquid product into the preform. The system includes a seal pin located within the forming head and moveable between a closed position and an opened position. In the closed position a sealing portion of the seal pin is in sealing engagement with a portion of the forming head so that an exit orifice is closed and liquid product is prevented from being injected into the preform. In the opened position, the sealing portion is disengaged from the portion of the injection head so that the exit orifice is open and the liquid product can be injected into the preform.
Claims22
A hydraulic blow molding system (1) for forming a container from a preform (19) by injecting a liquid product into the preform (19) thereby expanding the preform (19) into the shape of the container, the hydraulic blow molding system (1) comprising:
- a forming head (10) including a nozzle body (12), the nozzle body (12) defining a central passageway (14) terminating in an exit orifice (30), the central passageway defining a central axis;
- a source of liquid product coupled to the forming head (10) and in communication with the central passageway (14) and the exit orifice (30);
- a mold assembly (68) having interior surfaces (66) cooperating to define a mold cavity (70) in the shape of the plastic container;
- the hydraulic blow molding system (1) characterized by a seal pin (16, 44) located within the forming head (10) and being moveable between a closed position and an opened position, in the closed position a sealing portion (24) of the seal pin (16, 44) being in sealing engagement with a portion of the forming head (10) so that the exit orifice (30) is closed and the liquid product is prevented from being injected into the preform (19), in the opened position the sealing portion (24) of the seal pin (16, 44) being disengaged from the portion of the injection head (10) so that the exit orifice (30) is open and the liquid product injected into the preform (19).
The hydraulic blow molding system (1) according to any of the foregoing claims, wherein the sealing engagement between the seal pin (16, 44) and the portion of the forming head (10) is an engagement between one of non-axially extending surfaces of the seal pin (16, 44) and the portion of the forming head (10) and axially extending surfaces of the seal pin (16, 44) and the portion of the forming head (10).
The hydraulic blow molding system (1) according to one of the foregoing claims, wherein the sealing engagement between the seal pin (16, 44) and the portion of the forming head (10) is a sealing engagement between non-axially extending surfaces and axially extending surfaces of the seal pin (16, 44) and the portion of the forming head (10).
The hydraulic blow molding system (1) according to one of the foregoing claims, wherein the sealing engagement between the seal pin (16, 44) and the portion of the forming head (10) is a sealing engagement only between axially extending surfaces of the seal pin (16, 44) and the portion of the forming head (10).
The hydraulic blow molding system (1) according to one of the foregoing claims, wherein the seal pin (16) is part of an integrated seal pin/stretch rod (16) located within the forming head (10) and being moveable between a closed position and an opened position, in the closed position a sealing portion (24) of the integrated seal pin/stretch rod (16) being in sealing engagement with a portion of the forming head (10) so that the exit orifice (30) is closed and the liquid product is prevented from being injected into the preform (19), in the opened position the sealing portion (24) of the integrated seal pin/stretch rod (16) being disengaged from the portion of the injection head (10) so that the exit orifice (30) is open and the liquid product injected into the preform (19).
Dependencies are inferred from the claim text.