Flocked Appliqué Structure to Prevent Splitting on Elastomeric Substrates
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Solution Overview
Problem
Stretchable flock appliqués on elastomeric materials tend to split and crack under stress, leading to detachment and distortion, as the adhesive layer fails to return to its original shape and size, compromising both the artistic and functional quality.
Innovation Solution
A flocked article with a self-supporting adhesive layer comprising an obstructive film between two adhesive films, where the flock fibers are embedded in the first adhesive film to a depth of at least 50% of its thickness, and a rigid, inelastic layer is added to reduce stress and prevent splitting, using a process involving heat and pressure to adhere the flock fibers securely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional adhesive layer is used to bind flock fibers to stretchable/elastomeric material, then the appliqué can be initially attached, but the adhesive layer splits and cracks when linear or angular stress is applied
Solution Approach 1:
The adhesive layer is divided into multiple discrete adhesive particles or beads distributed throughout the layer, rather than a continuous film. This segmentation allows each particle to independently deform under stress without causing cracks to propagate through the entire adhesive layer, resolving the contradiction between maintaining strength and preventing splitting under stress.
Solution Approach 2:
The adhesive layer's physical parameters are changed by incorporating elastomeric components and adjusting the adhesive particle composition to match the stretch characteristics of the substrate. This allows the adhesive layer to dynamically adjust its mechanical properties under stress, maintaining both strength and integrity during stretching and recovery cycles.
2Strength
If the adhesive layer is made thicker to improve bonding, then initial adhesion is enhanced, but the adhesive layer fails to return to its original shape and size after stress is removed, causing distortion
Solution Approach 1:
The adhesive layer is designed as a thin, flexible structure composed of discrete particles rather than a thick continuous film. This thin film structure can elastically deform under stress and return to its original configuration, preventing permanent distortion while maintaining adequate bonding strength through the distributed particle architecture.
Solution Approach 2:
The adhesive layer uses a composite formulation combining different adhesive polymers with elastomeric components. This composite material provides both the bonding strength needed for initial attachment and the elastic recovery properties needed to return to the original shape after stress is removed.
3Strength
If flock fibers are deeply embedded in the adhesive layer to prevent detachment, then bonding strength is improved, but the adhesive layer becomes more prone to splitting and cracking under stress
Solution Approach 1:
The adhesive layer's segmented particle structure allows flock fibers to be embedded in multiple discrete particles rather than a continuous matrix. This provides numerous individual anchoring points for strong fiber adhesion while the spaces between particles allow the adhesive layer to deform and recover without splitting, resolving the contradiction between fiber embedding depth and resistance to cracking.
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 splitting and delamination of flock fibers from elastomeric substrates, maintaining the integrity and appearance of the flocked product even under repeated stress cycles, ensuring long-term adherence and stability.
Implementation Method 1
The obstructive film is one or both of an elastomeric material and an opaque material
Implementation Method 2
using a process involving heat and pressure to adhere the flock fibers securely
Implementation Method 3
using a process involving heat and pressure to adhere the flock fibers securely
Implementation Method 4
the adhesive layer binding the textile to the stretchable and/or elastomeric material
Data Source
AI summary
A flocked article having a resistance to splitting is described. The article has a flock layer adhered to one side of an elastomeric adhesive layer and an inelastic layer adhered to the other side of the elastomeric adhesive layer. The flock layer is adhered to a stretchable and/or elastic substrate by a third adhesive positioned between and in contact with the inelastic layer and the stretchable and/or elastic substrate.