PMC Base Fabric Seam Loop Preparation via Integrated Weft Yarns

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Solution Overview

Problem

Existing methods for preparing seam areas in paper machine clothing (PMC) base fabrics result in differential dewatering and increased production time and expense due to larger void areas and the time-consuming process of adding multifilament yarns after weaving.

Innovation Solution

A process where multifilament or specialty yarns are integrated as weft yarns during the original weaving process on a loom, positioned in the anticipated seam area, and then folded over with warp yarns to form seam loops, allowing for seamless integration and reduced production time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multifilament yarn is added after weaving for flat-woven base fabrics, then seam durability is improved, but production time increases

Engineering Contradiction:

Improveseam durabilityVSAvoidproduction time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by incorporating the multifilament yarn into the fabric during the original weaving process, before the fabric is completed. The multifilament yarn is positioned in the seam area during weaving, eliminating the need for subsequent addition steps and reducing production time while maintaining seam durability improvements

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If seam loops are formed on the base fabric, then the fabric can be joined in endless form, but production time and expense increase

Engineering Contradiction:

Improveendless form capabilityVSAvoidproduction time and expense

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges the seam formation process with the original weaving process by integrating multifilament yarn incorporation during weaving. This combination eliminates separate seam preparation steps, reducing production time and expense while maintaining the ability to form endless fabric

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If traditional seam preparation is used, then production time is reduced, but sheet marking occurs due to differential dewatering

Engineering Contradiction:

Improveproduction timeVSAvoidsheet marking

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by placing multifilament yarn specifically in the seam area during weaving. This localized enhancement improves the dewatering characteristics in the seam region, preventing sheet marking while maintaining efficient production timing

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2900866B1Method for preparing a seam area for a PMC base fabric

Publication Date: 2017.09.27 VOITH PATENT GMBH

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AI summary

A process for preparing a seam area for a paper machine clothing (PMC) base fabric includes the steps of: forming the PMC base fabric by flat-weaving, the PMC base fabric including warp yarns extending in machine direction and weft yarns extending in cross machine direction and interwoven with the warp yarns, the weft yarns including first weft yarns and a second weft yarn, the second weft yarn being a multifilament yarn, the warp yarns, the first weft yarns, and the multifilament yarn being woven together on a loom in an original weaving process, the multifilament yarn being positioned in an anticipated seam area; and folding over the PMC base fabric, after weaving the multifilament yarn with the warp yarns, to form a seam loop of the PMC base fabric such that the multifilament yarn is a first one of the weft yarns on a sheet side of the seam loop.