Patent ID: 8097160
Filing Date: 2012-01-17
Classification: B01D,Y10T

Abstract:
1. A method for manufacturing a solid-liquid separation flat membrane element, the method comprising: providing a support plate, a first membrane sheet, and a second membrane sheet, wherein: arranging the first membrane sheet on the first surface of the support plate so that the first membrane sheet overlaps the entire inner perimeter of the circumferential edge, but does not overlap an outer portion of the circumferential edge that is a part of the first surface; forming a weld between the first membrane sheet and the first surface of the support plate by emitting a laser through the second surface of the support plate to the first surface of the support plate and to the first membrane sheet, wherein the weld is formed around an entire periphery defined by the overlap between the first membrane sheet and the first surface of the support plate; arranging the second membrane sheet on the second surface of the support plate so that the second membrane sheet covers and overlaps an entire area on the second surface corresponding to an area on the first surface covered by the first membrane sheet welded to the first surface of the support plate; and forming a weld between the second membrane sheet and the second surface of the support plate by emitting a laser through the first surface of the support plate that is not covered by the first membrane sheet to the second surface of the support plate and to the second membrane sheet, wherein the weld is formed around an entire periphery defined by the overlap between the second membrane sheet and the second surface of the support plate.