The present disclosure describes a spiral cross-flow filter. The spiral cross-flow filter includes a filter element having a continuous web of leaves formed by pleating a laminate filter element. The filter element may include a composite filter material including a first layer of a membrane material adjacent an outer shell, and a second layer of a permeate spacer material adjacent a permeate tube. The plurality of leaves wrap around the permeate tube in a uniform "spiral" configuration and may be separated by feed spacers.

 
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> MOLD STRUCTURE, AND IMPRINT METHOD AND MAGNETIC TRANSFER METHOD USING THE SAME

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