Spiral filtration module with strengthened membrane leaves and method of constructing same.

摘要

The subject of the present invention is an improved leaf packet (16) useful in forming a spiral filtration module (34), the improved module (34) which results from utilization of the leaf packet (16) and a method of preparing the leaf packet (16). The membrane sheet (10) utilized in forming a spiral filtration module (34) is fused in the area of its fold to increase the sheet density in this area and thus provide protection against mechanical failure. The densification treatment may include the application of heat, pressure or both to the backing material (14) of the sheet (10). The densification may also include joining a reinforcing material (18) to the sheet (10), preferably by integrally fusing the material (18) to the sheet (10) on the backing side (14). <IMAGE>