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TECHNIQUE FOR SEALING MEMBRANE ELEMENT

IP.com Disclosure Number: IPCOM000235854D
Publication Date: 2014-Mar-27
Document File: 4 page(s) / 305K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a technique of sealing membrane of a spiral wound membrane element. The technique includes a strip of non-woven fabric similar to backing material of a membrane sheet. The strip of non-woven fabric is laminated on the membrane surface or back side along edge of the membrane sheet. Then gluing process commences by adding glue in the laminated area. As a result, solidified glue line is formed in the laminated area. The technique provides a solution of gluing the pair of membrane sheet on the side of membrane surface. The gluing prevents potential leakage of the membrane as glue is applied and ensures strong glue line.

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TECHNIQUE FOR SEALING MEMBRANE ELEMENT

BACKGROUND

The present invention relates generally to a spiral wound membrane element and more particularly to sealing of the spiral wound membrane element.

Gluing process is required for making the spiral wound membrane element. Glue is applied along edges on a backside of a membrane sheet to bond a pair of the membrane sheet. The pair of membrane sheet are back to back together with a permeate carrier between the membrane sheet to form a membrane leaf. During the gluing process, glue penetrates the porous support layer.  The porous support layer is made from non-woven fabric, polysulfone and an entity after curing.  However, when the pair of membrane sheet is bounded face to face, glue is applied on the membrane surface. This causes two issues, firstly glue does not penetrate into the skin layer and thereby results into ineffective glue. Secondly, the membrane damages during glue curing and operation of element. As a result, gluing process resulted in failed glue line and prevented feasibility of face-to-face glued element design. However, for the spiral flow design face to face gluing process is required.

It would be desirable to have an efficient technique for face to face gluing process to avoid above described issues.

BRIEF DESCRIPTION OF THE DRAWING

Figure 1 depicts the strip of non-woven fabric and the material of fabric is similar to backing material of the membrane sheet.

Figure 2 depicts solidified glue line of glue in laminated area 1 and 2.

Figure 3 depicts rolling of membrane sheet, nonwoven strip roll and laminated membrane.

Figure 4 depicts laminated non-woven fabric strip on back of the membrane sheet, which is punched along both edges.

 


DETAIL DESCRIPTION

The present invention proposes a technique of sealing membrane of a spiral wound membrane element.  The technique provides a solution of gluing the pair of membrane sheet on the side of membrane surface. The gluing prevents potential leakage of the membrane as glue is applied and ensures strong glue line. The technique includes a strip of non-woven fabric similar to backing material of a membrane sheet. The strip of non-woven fabric is laminated on the membrane surface or back side along edge of the membrane sheet. Then gluing process is achieved by adding glue in the laminated area. As a result, solidified glue line is formed in the laminated area. 

Figure 1 depicts the strip of non-woven fabric and the material of the fabric is similar to backing material of the membrane sheet.  The membrane sheet is laminated on the membrane surface along edge of the membrane sheet in advance of gluing process.

Figure 1- The strip of non-woven fabric with membrane sheet

In laminated area 1, the strip of non-woven fabric is fully laminated on the membrane sheet. ...