US 2016/0236156 A1 · SPIRAL WOUND MEMBRANE MODULE WITH REINFORCED FOLD LINE

Abstract

A spiral wound module in which the membrane sheet is heat and pressure treated to collapse at least some of the pores of the support layer. The treated membrane can then be folded along the heat and pressure treated area to form a crease. Once folded, the membrane sheet can be wound around a perforated inner tube along with a feed channel spacer and a permeate collection sheet. The wound module can then be enclosed into a hard shell with anti-telescoping devices at each end. By collapsing at least some of the pores in the support layer, the membrane becomes less permeable to fluid in the treated area. As such, there will be less or no leakage of unfiltered fluid passing through the fold line of the membrane sheet during operation of the wound module.

Claims35

Dependent claims

A spiral wound module comprising:

at least one membrane sheet wound around the perforated inner tube;
the membrane sheet comprising at least a discrimination layer and a support layer;
the support layer comprising a polymer;
the membrane sheet being folded such that a crease of a fold line is located in an area where the polymer density of the support layer is higher than the polymer density of the support layer elsewhere in the membrane sheet.

1 more element

Dependencies are inferred from the claim text.

Spiral wound membrane module with reinforced fold line

Life of this patent

Spiral wound membrane module with reinforced fold line

Life of this patent

Abstract

Claims35