Cellular Slat Inner Core Detachment for Thermal Stability
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Solution Overview
Problem
Conventional cellular slats for architectural structures face issues with stiffness, asymmetrical shape, and thermal deformation, particularly when exposed to varying temperatures, due to inadequate structural integrity and material compatibility between the exterior and interior components.
Innovation Solution
A cellular slat configuration featuring an outer sock and an inner core with twice-folded wall segments, where the inner core is partially or fully detached from the outer sock, allowing for symmetrical stiffness and thermal expansion/contraction, and heat-stabilization of fold edges to maintain shape and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a two-piece construction with an exterior torque tube and an interior insert strip is used, then some structural integrity is provided, but adequate stiffness at both outer edges is not achieved and the slat has an asymmetrical shape
Solution Approach 1:
The slat is divided into two separate components: an exterior sock and an interior cellular core. This segmentation allows each component to be optimized independently - the exterior sock provides the outer shell while the interior core with its symmetrical folded structure provides balanced edge stiffness and structural integrity without creating asymmetry in the overall slat shape
Solution Approach 2:
The interior cellular core is nested within the exterior sock, with the core's folded wall segments forming a symmetrical structure that fits inside the tubular exterior shell. This nesting arrangement allows the symmetrical core to provide balanced structural support at both outer edges while maintaining the overall aesthetic symmetry of the slat
2Stability of the object's composition
If fully laminated fabric/film assemblies are used to form closed-perimeter cells, then a complete cellular structure is achieved, but significant deformation and warping occur when exposed to high temperatures
Solution Approach 1:
The cellular structure is segmented into an exterior sock and an interior core that are not fully laminated together. This separation allows the interior core to expand and contract independently in response to temperature changes, preventing the stress buildup that causes deformation and warping in fully laminated constructions while maintaining the integrity of the cellular structure
Solution Approach 2:
The degree of lamination between the exterior sock and interior core is changed from complete (fully laminated) to partial or no lamination. This parameter change allows differential thermal expansion between the two components, eliminating the thermal stress that causes warping and deformation in fully laminated assemblies while preserving the cellular structure's integrity
3Strength
If the inner core is fully laminated to the outer sock, then structural integrity is enhanced, but thermal expansion and stress-related issues occur in window environments
Solution Approach 1:
The slat is segmented into an exterior sock and an interior core with a detached or partially detached interface. This segmentation creates independent thermal zones that can expand and contract at different rates, preventing the stress buildup and deformation that occurs in fully laminated constructions while maintaining sufficient structural integrity through the coordinated design of the two components
Solution Approach 2:
The interface between the exterior sock and interior core acts as an intermediary zone that allows controlled movement and stress relief. Rather than being fully bonded, this interface permits differential thermal expansion while maintaining structural coherence, effectively mediating between the conflicting requirements of structural integrity and thermal reliability
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 enhanced stiffness, symmetry, and thermal stability to the cellular slats, reducing deformation and warping, while allowing for stress relief from temperature fluctuations, resulting in a more aesthetically pleasing and functionally effective covering for architectural structures.
Implementation Method 1
The inner core includes first and second fold edges formed between the first and second ends such that the inner core includes a plurality of wall segments
Implementation Method 2
the inner core is in an at least partially detached state relative to the outer sock along at least a portion of an interface defined between the inner core and the outer sock
Data Source
AI summary
In one aspect, a cellular slat for a covering for an architectural structure includes an outer sock forming an outer cellular structure and an inner core configured to be positioned within the outer cellular structure. The inner core includes first and second ends and first and second fold edges formed between the first and second ends. With the inner core positioned within the outer sock, the inner core forms an inner cellular structure having a first curved profile extending along the first side of the cellular structure between the first and second fold edges and a second curved profile extending along the second side of the cellular structure between the first and second fold edges. Additionally, the inner core is in an at least partially detached state relative to the outer sock along at least a portion of an interface defined between the inner core and the outer sock.