Multi-Component Injection Molded Composites for UL Fire Classification
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Solution Overview
Problem
Injection-molded multi-component composite systems face challenges in achieving specific fire classifications, particularly when individual components do not meet the required fire classification standards, especially with thin wall thicknesses and high design requirements, where the selection of suitable materials for flame protection is limited by legal and normative requirements.
Innovation Solution
A method for producing fully or partially injection-molded multi-component composite systems by selecting suitable thermoplastic materials for components A and B, where component A has a thickness that meets at least V2 classification and component B has sufficient flame retardancy properties, allowing the entire system to meet V0 or V1 fire protection classification despite component A not meeting the classification in its individual thickness, with a thickness ratio of a/b ≤ 2.5, enabling easier material selection based on UL characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual components are made with thin wall thicknesses to meet design requirements, then manufacturing precision and design attractiveness are improved, but fire behavior deteriorates because individual components cannot achieve sufficient flame retardancy
Solution Approach 1:
The patent applies composite materials by combining multiple thermoplastic components (A and B) with different flame retardancy properties into a single multi-component composite system. Component A provides structural integrity while component B contributes flame retardancy, allowing the composite to achieve V0 or V1 fire classification even with thin wall thicknesses that would be insufficient for individual components.
Solution Approach 2:
The patent applies local quality by assigning different functional properties to different components within the composite system. Component A is optimized for structural requirements and flow properties, while component B is specifically selected for flame retardancy. This localized functional differentiation allows each component to excel at its specific function while the composite system achieves overall fire protection.
2Object-affected harmful factors
If flame retardant additives are selected to improve fire behavior, then fire protection is improved, but material selection is limited by legal and normative requirements such as ecolabels and UL listing
Solution Approach 1:
The patent applies parameter changes by shifting the evaluation criterion from individual component properties to system-level composite properties. Instead of requiring each component to meet fire classification standards individually (restrictive parameter), the system achieves fire classification through the combined effect of multiple components (flexible parameter), thereby expanding material selection flexibility while maintaining fire protection.
Solution Approach 2:
The patent uses composite materials to bypass limitations on individual component selection. By combining components that individually may not meet fire standards with flame retardant additives (due to ecolabel restrictions), the composite system achieves the required V0 or V1 classification, thus expanding the pool of selectable materials beyond what would be available to individual components.
3Adaptability or versatility
If high proportions of low or non-FR protected material are used in composite systems, then design freedom and material versatility are improved, but achieving good UL listing becomes difficult
Solution Approach 1:
The patent applies local quality by concentrating flame retardant properties in specific components (component B) while allowing other components (component A) to provide structural or aesthetic functions without flame retardant additives. This localized functional assignment enables high proportions of non-FR material in the composite while achieving UL V0 or V1 listing through the flame-retardant component's contribution to the system's overall fire behavior.
Data Source
Figure 1~2
AI summary
The present invention relates to entirely or partially injection molded multicomponent composite systems, having improved fire behavior, and a method for producing the same.