Method of forming a container using a liquid
AssigneeDiscma AG
InventorsPankaj Kumar, Pascal Bernier
Life of this patent
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Abstract
A method of forming a container from a plastic preform while using a liquid as a blow medium. During the method, liquid is withdrawn from the container to reduce pressure within the container prior to disengaging of the injection head from the container. In one aspect the method involves the opening of a recirculation valve to reduce the pressure. The opening of the recirculation valve allowing air dispersed within the liquid to rise to the top of the container before disengaging of a forming head from the container. As a result, splashing and spillage of liquid from the neck of the container is eliminated when the forming head disengages from the container.
Claims22
A method of forming a container from a plastic preform while using a liquid as a blow medium, the method comprising the steps of:
- lowering a forming head to form a sealed engagement between the forming head and a neck of the preform;
- injecting the liquid into the preform from the forming head, the liquid causing the preform to be formed into the container;
- stopping the injecting of liquid after forming of the container;
- after forming of the container, reducing the pressure within the contain from a pressure above ambient pressure directly to ambient pressure by withdrawing a portion of the liquid from the container;
- after reducing the pressure from above ambient pressure directly to ambient pressure, disengaging of the forming head from the neck of the container, whereby splashing and spillage of liquid from the neck of the container is eliminated when the forming head is disengaged from the neck of container.
Dependencies are inferred from the claim text.