Importance

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Abstract

Methods of injecting into a cavity an at least three-layer flow stream having a fast flow stream line, are provided which include establishing the flow of material of first and second layers of the flow stream to form an interface therebetween at a first location not coincident with the fast flow stream line, interposing the flow of material of a third layer in the interface, and moving the third layer to a second location relatively more proximate to, substantially coincident with, or across from and not substantially coincident with the fast flow stream line. This moving achieves foldover of the third layer and can be effected by selectively changing the flow of material(s) on one side of the third layer relative to the flow of material(s) on the other side thereof, at or shortly after the interposition of the third layer. Preferably, the interface is annular and the interposition is at substantially all places around the interface. These methods can be used to prevent, reduce or overcome bias of the terminal or marginal end portion of the third layer during multi-layer injection of a container, to provide a substantially unbiased overall leading edge of the third layer, such that the folded over portion and the unfolded portion of the marginal end portion is finally positioned in the sidewall of the container in a substantially unbiased plane relative to the axis of the container.

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First Claim