Sealed Decorative Stitching for Foam-Filled Panels
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Solution Overview
Problem
Existing foam-filled panels with decorative stitching face issues with foam leakage due to gaps between the decorative thread and needle holes during the foam injection process, as the injectable foam can escape through these openings.
Innovation Solution
The decorative thread stitching is sealed by either adhesively attaching an impermeable membrane or using an expandable thread that expands when wet to fill the gaps between the needle holes and the thread, preventing foam leakage. This sealing method is applied before the foam is injected between the substrate and skin layers, ensuring a leak-proof foam-filled panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If decorative stitching is added to the skin layer, then the luxurious appearance and craftsmanship detail are improved, but foam leakage occurs through the gaps between the decorative thread and needle holes
Solution Approach 1:
An impermeable membrane is introduced as an intermediary component between the decorative stitching and the foam filling process. The membrane is adhesively attached along the stitching lines to seal the gaps between threads and needle holes, preventing foam leakage while preserving the aesthetic appearance of the stitching.
Solution Approach 2:
The stitching is performed in advance before the foam filling process. By completing the decorative stitching beforehand, the needle holes and gaps are already present and can be sealed with the impermeable membrane prior to foam injection, preventing leakage without compromising the aesthetic design.
2Reliability
If an impermeable membrane is attached to seal the stitching, then foam leakage is prevented, but the device complexity and manufacturing steps increase
Solution Approach 1:
A thin impermeable membrane is used to seal the stitching areas. This thin film approach provides effective foam containment while adding minimal structural complexity to the panel assembly.
Solution Approach 2:
The membrane attachment is performed as a preliminary step before foam filling, allowing the sealing process to be integrated into the existing manufacturing workflow without requiring complex additional equipment or processes.
3Reliability
If expandable thread is used to seal the stitching, then foam leakage is prevented and manufacturing steps are reduced, but control over thread expansion and aesthetic design becomes more challenging
Solution Approach 1:
Expandable thread technology utilizes parameter changes in the thread material properties. The thread is designed to expand when exposed to moisture or heat, automatically sealing the gaps around needle holes. This chemical/physical property change provides sealing functionality without requiring additional manufacturing steps.
Solution Approach 2:
The expandable thread performs the sealing function automatically through its expansion property when exposed to environmental conditions (moisture or heat). This self-service mechanism eliminates the need for separate sealing operations, though it requires careful control of expansion parameters to maintain both sealing effectiveness and aesthetic appearance.
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 effectively prevents foam leakage, maintaining the luxurious appearance and feel of the panel while ensuring a secure and consistent foam filling process, allowing for precise control over thread expansion and aesthetic design.
Implementation Method 1
a thread that expands when wet can be used for stitching the skin layer, the thread expanding to fill the open space between the needle hole and the thread
Data Source
AI summary
A foam filled panel with decorative thread stitching is provided. In addition, the stitching can be sealed to prevent leakage of foam when it is injected between a substrate and a skin layer to provide a foam filled panel. The decorative thread stitching can be sewn into the skin layer of the foam filled panel before the panel is assembled and filled with injectable foam. In addition, the skin can be made via slush molding, which allows various features and details to be molded into the skin. In some instances, the stitching can be sealed by adhesively attaching an impermeable membrane along a length of the stitching, thereby covering all the openings. In other instances, the stitching is sealed by using an expandable thread. Also disclosed is a process for manufacturing a foam filled panel with decorative thread stitching.