Down Core Insulating Sheet with Heat-Fused Binder
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Solution Overview
Problem
Existing down feather sheets face challenges in retaining down clusters during thermal processing, leading to dispersion and loss, and lack stretchability for flexible applications, resulting in inadequate insulation and aesthetic issues in garments and construction.
Innovation Solution
A thermally insulating sheet formed by a down core structure mixed with a binder of glue particles and/or polymer fibers, heat-set to create a homogeneous, breathable, and stretchable sheet without scrim sheets, ensuring higher bond density on outer surfaces to prevent down cluster escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If down feathers are retained in a homogeneous form by a chemical binder agent or rigid fibers, then the down feathers are exposed on all sides of the sheet providing superior insulation, but extra care is necessary to prevent the down feathers from detaching from the faces of the sheet
Solution Approach 1:
A scrim sheet acts as an intermediary carrier that temporarily holds the down feather mixture during thermal processing. The scrim sheet receives the down feather-binder mixture, allows heat penetration to activate binding, and then facilitates removal without down feather loss, solving both insulation performance and detachment prevention
Solution Approach 2:
The down feathers are pre-mixed with a binder agent before thermal processing to form a stable mixture that maintains its structure during handling and processing, preventing premature detachment while allowing subsequent homogeneous distribution
2Object-affected harmful factors
If down feathers are held captive between sheets of non-woven fabrics adhered by a glue binder, then some escapement of down feathers is prevented, but the material does not provide for stretching of the sheet
Solution Approach 1:
The binding system transitions from rigid adhesive bonds to a dynamic thermal bonding process where the binder activates upon heating to hold down feathers, allowing the sheet to stretch and flex while maintaining down feather retention through heat-activated binding rather than permanent rigid adhesion
3Adaptability or versatility
If rigid down insulating sheets are stretched to attach to flexible and rigid shaped objects, then installation flexibility is improved, but the sheets tear to form clumps of insulation which gather in specific areas and become visible
Solution Approach 1:
The physical and chemical parameters of the binder are changed through thermal processing to activate binding properties. The binder remains flexible at processing temperatures to allow stretching without tearing, then sets to provide structural integrity, enabling both installation flexibility and sheet durability
Solution Approach 2:
The sheet combines down feathers with a flexible binder matrix that provides both stretchability and structural integrity. This composite structure allows the material to deform during installation without tearing, preventing clump formation while maintaining insulation quality
4Ease of manufacture
If down clusters are conveyed in a thermal chamber without a scrim sheet, then the down clusters can disperse from the surfaces of the sheet due to air flow, but using a scrim sheet complicates the fabrication process
Solution Approach 1:
The scrim sheet serves as a temporary intermediary carrier that simplifies fabrication by providing a stable base for conveying the down feather mixture through the thermal chamber. It prevents air flow dispersion while allowing complete heat penetration and subsequent easy removal, achieving both manufacturing ease and composition stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a stable, breathable, and lightweight thermally insulating sheet that maintains down clusters, allowing for stretchability and improved insulation without clumping, suitable for various applications including garments and construction.
Implementation Method 1
heat-set together while overcoming the above mentioned disadvantages
Implementation Method 2
down clusters mixed with a binding material which when subjected to heat is capable of bonding together to form a homogeneous core sheet
Data Source
AI summary
A thermally insulating sheet formed by a down core structure which is comprised solely of down feather material mixed with binding material which is heat fused together to form a homogeneous sheet core. The method of fabricating the homogeneous thermally insulating sheet to form the down core structure is described. This novel method restrains the down clusters and binding material during the process of mixing, depositing, conveying and heat fusing to form a homogeneous down core sheet. The down core structure is subjected to two separate heat treatments which produces a down core sheet having at least some of its outer surfaces being of higher bond density than the inside of the core.