Feedblock for manufacturing multilayer polymeric films
First Claim
1. A feedblock comprising:
- a first packet creator that forms a first packet including a first plurality of polymeric layers, the first plurality of polymeric layers including at least four first individual polymeric layers;
a second packet creator that forms a second packet including a second plurality of polymeric layers, the second packet creator separate and distinct from the first packet creator, the second plurality of polymeric layers including at least four second individual polymeric layers, wherein the first packet creator is configured such that the first individual polymeric layers are formed at approximately the same time as one another, and the second packet creator is configured such that the second individual polymeric layers are formed at approximately the same time as one another; and
means for combining the first packet and the second packet to form a multilayer flow stream including the first plurality of polymeric layers and the second plurality of polymeric layers,wherein the feedblock is configured such that for each packet generated in the feedblock, the feedblock includes a separate and distinct packet creator having a separate and distinct plurality of flow channels and a separate and distinct plurality of conduits, andwherein the first packet is substantially formed in a first flow direction, the second packet is substantially formed in a second flow direction, and the means for combining the first packet and the second packet combines the first and second packets along a longitudinal axis, wherein the first flow direction defines a first angle with the longitudinal axis and the second flow direction defines a second angle with the longitudinal axis, wherein the first and second angles range from approximately 5 degrees to approximately 60 degrees.
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Abstract
A feedblock including a first packet creator that forms a first packet including a first plurality of polymeric layers, the first plurality of layers including at least four first individual polymeric layers; and a second packet creator that forms a second packet including a second plurality of polymeric layers, the second plurality of layers including at least four second individual polymeric layers, wherein the first and second packet creators are configured such that, for each packet creator, respective individual polymeric layers of the plurality of polymeric layers are formed at approximately the same time. The feedblock may include a packet combiner that receives and combines the first and second primary packets to form a multilayer stream. In some examples, at least one of the first and second primary packets may be spread in the cross-web direction prior to being combined with one another.
21 Citations
24 Claims
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1. A feedblock comprising:
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a first packet creator that forms a first packet including a first plurality of polymeric layers, the first plurality of polymeric layers including at least four first individual polymeric layers; a second packet creator that forms a second packet including a second plurality of polymeric layers, the second packet creator separate and distinct from the first packet creator, the second plurality of polymeric layers including at least four second individual polymeric layers, wherein the first packet creator is configured such that the first individual polymeric layers are formed at approximately the same time as one another, and the second packet creator is configured such that the second individual polymeric layers are formed at approximately the same time as one another; and means for combining the first packet and the second packet to form a multilayer flow stream including the first plurality of polymeric layers and the second plurality of polymeric layers, wherein the feedblock is configured such that for each packet generated in the feedblock, the feedblock includes a separate and distinct packet creator having a separate and distinct plurality of flow channels and a separate and distinct plurality of conduits, and wherein the first packet is substantially formed in a first flow direction, the second packet is substantially formed in a second flow direction, and the means for combining the first packet and the second packet combines the first and second packets along a longitudinal axis, wherein the first flow direction defines a first angle with the longitudinal axis and the second flow direction defines a second angle with the longitudinal axis, wherein the first and second angles range from approximately 5 degrees to approximately 60 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A feedblock comprising:
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a first packet creator that forms a first packet including a first plurality of polymeric layers, the first plurality of polymeric layers including at least four first individual polymeric layers; a second packet creator that forms a second packet including a second plurality of polymeric layers, the second packet creator separate and distinct from the first packet creator, the second plurality of polymeric layers including at least four second individual polymeric layers, wherein the first packet creator is configured such that the first individual polymeric layers are formed at approximately the same time as one another, and the second packet creator is configured such that the second individual polymeric layers are formed at approximately the same time as one another; and a packet combiner configured to combine the first and second packets, the packet combiner comprising; a first channel that receives the first packet from the first packet creator; and a second channel that receives the second packet from the second packet creator, wherein the first channel and the second channel are configured to combine the first and second packets to form a multilayer flow stream including the first plurality of polymeric layers and the second plurality of polymeric layers, wherein the feedblock is configured such that for each packet generated in the feedblock, the feedblock includes a separate and distinct packet creator having a separate and distinct plurality of flow channels and a separate and distinct plurality of conduits, and wherein the first packet creator is disposed in a first housing and the second packet creator is disposed in a different second housing, the first and second housings being spaced apart from each other. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A feedblock comprising:
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means for forming a first packet including a first plurality of polymeric layers, the first plurality of polymeric layers including at least four first individual polymeric layers; means for forming a second packet including a second plurality of polymeric layers, the second plurality of polymeric layers including at least four second individual polymeric layers, wherein the means for forming the first packet is configured such that first individual polymeric layers are formed at approximately the same time as one another, and the means for forming the second packet is configured such that the second individual polymeric layers are formed at approximately the same time as one another; and means for combining the first packet and the second packet to form a multilayer flow stream including the first plurality of polymeric layers and the second plurality of polymeric layers, wherein the first packet is substantially formed in a first flow direction, the second packet is substantially formed in a second flow direction, and the means for combining the first packet and the second packet combines the first and second packets along a longitudinal axis, wherein the first flow direction defines a first angle with the longitudinal axis and the second flow direction defines a second angle with the longitudinal axis, wherein the first and second angles range from 5 degrees to 60 degrees. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification