The present invention efficiently processes an end portion of a metallic wire rod on the winding start side at a low cost. A hollow cylindrical filter produced by winding a metallic wire rod 20 spirally and in a multilayered manner includes an inner cylindrical body 31 including a first wire rod layer L1 located on the innermost circumference and being wound with two or more layers of the metallic wire rod, and an outer cylindrical body 32 located immediately on the outer circumferential side of the inner cylindrical body and wound with the metallic wire rod. After the inner cylindrical body is formed, a start end portion 20a of the metallic wire rod is folded to be positioned on an outer circumferential side of the inner cylindrical body, and is further wound with the metallic wire rod to form the outer cylindrical body, whereby the start end portion of the metallic wire rod is folded and placed between the inner cylindrical body and the outer cylindrical body.
HOLLOW CYLINDRICAL FILTER, AND MANUFACTURING METHOD
HOHLZYLINDRISCHER FILTER UND VERFAHREN ZU SEINER HERSTELLUNG
FILTRE CYLINDRIQUE CREUX ET PROCÉDÉ DE FABRICATION
2024-07-17
Patent
Electronic Resource
English
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