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AssigneeTetra Laval Holdings & Finance S.A.
InventorsDominique Chatard, Jens Fuchs, Hans Kindinger, Rolf Kuhn, Rudiger Wlach, Lothar Wilhelm
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The invention relates to a device for producing containers from a plastic material that can be shaped by means of stretch blow forming and whose inner space corresponds to the finished container, said container being retained on its open end by a receiving element with gas flow pipes. A moveable stretch die (1) is axially guided through the receiving element and an ignition device is mounted in order to ignite an explosive gas mixture inside the container. In order to produce plastic containers having a better outer appearance, such as a substantially clear, transparent wall, and improve reliability of production, the receiving element can be engaged in a fluidically tight manner with the main distribution block (2) by the end thereof that faces the container, the stretching die (1) being movably guided through said distribution block in the axial extension of the receiving element. At least one first fluidic connection (13) is provided in a first area of the main distribution block (2) facing away from the container, and an additional fluidic connection (14) is provided in an opposite second area of the main distribution block (2) facing the container. The pipes (26, 14, 15) from the two fluidic connections (13, 14) in the second area in the main distribution block (2) are connected together. A single common flow channel (15) is formed between the connecting point (16) and the receiving element.
An apparatus for use in a device for the production of containers from a plastic which is deformable by stretch blow molding into a mold having an inner space that corresponds to that of the finished container, said device having a holder for retaining the container, said apparatus having a moveable stretching die (1) guided through the holder to stretch a blank of the deformable plastic, having gas supply channels (26, 14 and 15) and having an igniter (35) arranged to ignite an explosive gas mixture within the stretched plastic blank to expand the plastic blank into mold, wherein the apparatus at an end facing the container has a sealing washer (29) that can be brought into sealing engagement with the holder at an end facing away from the container to permit passage of gas into the container from distribution block (2) and to permit axial movement of stretching die (1) of the apparatus through the holder to stretch the plastic blank, at least one first flow-agent connection (13) of the apparatus being fitted in a first region of the main distributor block (2) facing away from the container and a further flow-agent connection (14) being fitted in a opposite region of main distributor block (2) facing the container, supply channels (26, 14, 15) being interconnected and connection (13) and supply channels (16) and (15) being interconnected such that channel (15) is shared by gases from both of connections (13) and (14).
Dependencies are inferred from the claim text.