PLEATING APPARATUS AND PLEATING METHOD

• Main Authors: STOYELL RICHARD C, WILLIAMSON KENNETH M, GEIBEL STEPHEN A, HOPKINS SCOTT D, WOLFF TERRY L
• Format: Patent
• Language: English
• Published: 17.07.2001
• Edition: 7
• Subjects: CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER; MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARDOR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; PACKING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STORING; TRANSPORTING; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER

PROBLEM TO BE SOLVED: To provide a pleated filter member, a method and apparatus for manufacturing the same, a method for precoating or backwashing the pleated filter member and a filter having a large filtering surface area and a long life. SOLUTION: The filter member is a cylindrical filter member 10 having a longitudinal axial line, first and second end surfaces and a large number of longitudinal pleats 11, and each pleat has a pair of leg parts and each of the leg parts has first and second surfaces and the pleat is extended over at least 50% of the length in the axial direction of the filter member in the whole height of each leg part. The cylindrical filter member is in a laid over state wherein the first surface of one leg part is in close contact with the second surface of the adjacent leg part of the pleat over a continuous region and a first impermeable end cap is connected to the first end surface of the filter member.