Conductive Yarn Seam Stitching for Antistatic Durability
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Solution Overview
Problem
Conductive clothing loses electroconductive and antistatic properties across seams due to deterioration of conductive yarn contacts during repeated washing, failing to maintain surface resistance within regulatory standards.
Innovation Solution
Strengthening the contact of conductive yarns between fabrics in seams through a specific stitching method, with a stitch interval of not more than 5 mm and multiple stitches, and using conductive yarns inserted in a lattice pattern, along with crimped yarns for enhanced durability and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive yarns are woven into clothes to achieve electroconductive properties, then surface electroconductive and antistatic properties are improved, but the electroconductive properties deteriorate after repeated washing due to contact deterioration between conductive yarns in seams
Solution Approach 1:
The invention divides the seam structure into multiple layers by folding the seam allowance to create multiple piles of fabric. This segmentation increases the number of contact points between conductive yarns from single-point contact to multi-point contact across multiple fabric layers, thereby improving the durability of electroconductive properties after repeated washing.
Solution Approach 2:
The conductive yarns are pre-positioned within the seam allowance before sewing, and the seam is constructed with multiple fabric piles to ensure contact between conductive yarns of different fabrics. This preliminary arrangement ensures that electroconductive contact is established before the garment is subjected to washing, preventing deterioration of electroconductive properties.
2Reliability
If conductive material is inserted into seam allowance to maintain electroconductive properties, then surface resistance is improved, but the method incurs high cost and durability issues
Solution Approach 1:
The invention utilizes the existing conductive yarns that are already woven into the fabric, rather than inserting additional conductive materials into the seam allowance. The seam construction itself is designed to facilitate contact between these existing conductive yarns, eliminating the need for separate conductive materials and reducing manufacturing cost while maintaining durability.
Solution Approach 2:
The seam allowance serves multiple functions: it provides structural reinforcement for the seam and simultaneously acts as a conduit for conductive yarn contact. By designing the seam to create multiple fabric piles, the same structural element serves both mechanical and electroconductive purposes, reducing the need for additional components.
3Ease of manufacture
If conductive yarn is partially used in sewing thread to reduce cost, then manufacturing cost is reduced, but the electroconductive property across seam is not satisfied and deteriorates when puckering occurs
Solution Approach 1:
The invention extracts the electroconductive function from the sewing thread and places it into the fabric structure itself through the conductive yarns woven into the fabric. The sewing thread can be ordinary non-conductive thread, while the electroconductive properties are achieved through the conductive yarns in the fabric that are brought into contact by the multi-pile seam construction.
Data Source
AI summary
A sewn product comprises fabrics having conductive yarns inserted each in a warp direction and a weft direction and disposed in a lattice at intervals, wherein at least two stitches in at least one place of seam are provided with a stitch interval of not more than 5 mm, and a surface resistance (R) between two points separated by 30 cm across at least one seam is according to the formula: R≦1.0×1012Ω. A sewn product comprises fabrics having conductive yarns inserted each in a warp direction and a weft direction and disposed in a lattice at intervals, wherein in at least one place of seam a number of piles of clothing fabrics of seam allowance is 5 or more, and a surface resistance (R) between two points separated by 30 cm across at least one seam is R≦1.0×1012Ω.