Spiral Wound Membrane Leaf Sealing With Low-Density Tricot

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Solution Overview

Problem

Existing separation membrane technologies face challenges in maintaining stable manufacturing and enhancing salt rejection performance in spiral wound modules due to issues with adhesive sealing and mixing of raw and produced water.

Innovation Solution

Incorporating a low-density portion in the tricot of the permeation-side flow path material, with specific distance and density characteristics, to enhance the adhering portion's sealability and prevent mixing of raw and produced water, while maintaining the strength of the fabric.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a uniform density tricot is used in the permeation-side flow path material, then the fabric strength is maintained, but the sealability of the adhering portion is insufficient causing mixing of raw and produced water

Engineering Contradiction:

Improvesealability of adhering portionVSAvoidmixing of raw and produced water

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The tricot is designed with non-uniform density distribution, creating a low-density portion specifically in the adhering portion area. This local modification allows the adhering portion to have enhanced sealability through better adhesive penetration and bonding, while other areas maintain the original fabric strength and flow characteristics.

Inventive Principle:

Principle #3Local quality

2Reliability

If the tricot density is increased to improve sealability, then adhesive bonding is enhanced, but the fabric becomes less permeable and manufacturing stability decreases

Engineering Contradiction:

ImprovesealabilityVSAvoidmanufacturing stability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Instead of increasing overall tricot density, the invention applies local density modification only in the adhering portion area. The low-density portion (0.5-5% of total area) with larger loop spaces facilitates adhesive penetration and bonding, while the majority of the tricot maintains original density for stable manufacturing and proper flow characteristics.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The tricot is segmented into different density zones: a low-density adhering portion for sealing and a normal-density body portion for structural integrity and flow performance. This segmentation allows each zone to optimize its function without compromising the other.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the adhering portion area is increased to improve sealing, then more adhesive can be applied, but the overall fabric strength and flow performance are compromised

Engineering Contradiction:

ImprovesealabilityVSAvoidfabric strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The invention creates a localized low-density adhering portion within the existing tricot structure rather than expanding the adhering portion area. This approach concentrates the sealing function in a specific zone while preserving the overall fabric integrity and flow performance characteristics of the complete tricot structure.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3831467B1Separator leaf, and spiral wound module and device comprising same

Publication Date: 2025.12.24 NANOH2O CO LTD

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AI summary

The present specification provides a separation membrane leaf, and a spiral wound module and an apparatus comprising the same.