Biodegradable Yarn Flame Resistance via Composite Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current biodegradable yarns lack flame resistance, as existing solutions rely on non-biodegradable flame retardants or non-biodegradable materials like polyester.
Innovation Solution
A biodegradable yarn composed of 25-55 weight-% viscose fibers and 45-65 weight-% polybutylene succinate fibers, which are completely biodegradable and provide increased flame resistance, meeting class B1 criteria according to DIN 4102-1 and EN 13501-1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biodegradable yarn is produced without flame retardant treatment, then the yarn is completely biodegradable, but the flame resistance is insufficient
Solution Approach 1:
The invention uses a composite yarn structure combining viscose fibers (55-65 wt%) and polybutylene succinate fibers (35-45 wt%). This composite material approach achieves flame resistance through the inherent properties of the fiber combination rather than adding non-biodegradable flame retardant chemicals, thus maintaining complete biodegradability while meeting flame safety class B1 requirements
Solution Approach 2:
The invention changes the compositional parameters of the yarn by specifying precise weight percentages of viscose (55-65%) and polybutylene succinate (35-45%) fibers. This parameter optimization achieves the desired flame resistance and mechanical properties without requiring chemical flame retardant treatments, preserving the biodegradable nature of the yarn
2Reliability
If polyester fibers are used to increase flame resistance, then the flame resistance is improved, but the yarn loses biodegradability
Solution Approach 1:
The invention replaces polyester fibers with polybutylene succinate fibers, changing the material composition parameter. Polybutylene succinate is a biodegradable polyester alternative that maintains flame resistance properties while being completely biodegradable, thus achieving class B1 flame safety without compromising environmental degradability
Solution Approach 2:
The invention creates a composite yarn using viscose and polybutylene succinate fibers in specific proportions (55-65% viscose, 35-45% polybutylene succinate). This composite structure achieves the flame resistance typically associated with polyester while maintaining complete biodegradability, as both component fibers are biodegradable
Data Source
AI summary
This application relates to a biodegradable yarn which exhibits an increased flame resistance. The biodegradable yarn comprises from 25 to 55 weight-%, preferably from 35 to 45 weight-% of viscose fibers or of viscose filaments and from 45 to 65 weight-%, preferably from 50 to 60 weight-%, most preferably 55 weight-% of polybutylene succinate fibers. The viscose fibers or filaments are preferably free of chlorine. Further, the present application concerns a method for manufacturing a biodegradable yarn having an increased flame resistance.