Retro-Reflective Bonding on Elastic Fabrics Without Cracking
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Solution Overview
Problem
The thermal adhesion of retro-reflective materials on elastic materials and fabrics is complex, leading to cracking, deformation, and inefficiencies in the final product, including reduced retro-reflectiveness, lifespan, and appearance issues due to existing methods.
Innovation Solution
A two-step thermal-fusion method involving specific temperature, pressure, and stretching conditions for the application and smoothing of retro-reflective materials on elastic materials, ensuring fusion without deformation and maintaining material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal adhesion method is used to apply retro-reflective material on elastic materials, then the retro-reflective material can be adhered to the fabric, but cracking occurs in the retro-reflective material after stretching
Solution Approach 1:
The patent divides the thermal adhesion process into two distinct stages: a first thermal adhesion stage with specific temperature and pressure parameters, and a second thermal conditioning stage with different parameters. This segmentation allows optimization of each stage independently to prevent cracking while maintaining adhesion strength.
Solution Approach 2:
The patent applies different temperature, pressure, and time parameters in the first thermal adhesion stage versus the second thermal conditioning stage. By changing parameters between stages, the process achieves both strong adhesion and prevention of cracking during subsequent stretching.
2Reliability
If thermal adhesion method is used to apply retro-reflective material on elastic materials, then the material can be bonded, but deformation and undulations occur in the elastic material
Solution Approach 1:
The patent separates the bonding process into two stages: first thermal adhesion for bonding, and second thermal conditioning for shape recovery. This segmentation allows the fabric to be bonded while minimizing deformation and eliminating undulations through the conditioning stage.
Solution Approach 2:
The patent converts the harmful effect of heat-induced deformation into a beneficial process by using controlled thermal conditioning. The same thermal energy that causes deformation is later used in a controlled manner to relax and eliminate undulations, transforming the harmful effect into a shape-recovery mechanism.
3Reliability
If thermal adhesion method is used to apply retro-reflective material on elastic materials, then the material can be fused, but granules and creases are created interfering with fabric use
Solution Approach 1:
The patent divides the process into first thermal adhesion for fusion and second thermal conditioning for surface smoothing. This segmentation ensures strong fusion while eliminating granules and creases that would interfere with fabric functionality.
Solution Approach 2:
The patent converts the harmful surface defects (granules and creases) created during thermal adhesion into opportunities for improvement through the second thermal conditioning stage, where controlled heat application smooths the surface and eliminates defects while preserving fusion strength.
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 method achieves a high-quality, efficient, and durable application of retro-reflective materials on elastic materials, maintaining their properties and the fabric's original shape, enhancing visibility, comfort, and appearance while preventing granules and creases.
Implementation Method 1
retro-reflectiveness has the property of sending the received stream of light back to the light source
Implementation Method 2
Thermal-Fusing it: accordingly, the retro-reflective material is thermally-fused to the garment by means of a system that applies heat, requiring at the same time certain pressure for a certain period of time to cause them to fuse together
Data Source
AI summary
A method allowing retro-reflective material to be applied on elastic materials, bodies and fabrics by which it is possible to manufacture retro-reflective products that do not suffer from deterioration, cracking or breaking of the applied retro-reflective material when stretched, and that allows, at the same time, to fully retain the properties, color and shape of the elastic material or fabric upon which the procedure was conducted, that comprises the following steps: a) thermal application of retro-reflective material, which includes an amount of retro-reflective material that varies from 0.5 and 3.5 cm2 per square centimeter of elastic material being treated, a temperature that varies between 110.0 and 215.0° C., a pressure that varies between 1.020 and 6.021 Kg/cm2; this step must be performed while the elastic body is subjected to a stretching ranging between 5.0 and 50.0% of its total expansion potential, over a period of time that fluctuates between 4.0 and 45.0 seconds or, where appropriate, in a continuous manner, at a speed rate that varies between 0.01 and 4.00 m/s; and b) smoothing and fixing of the product, step which comprises applying a temperature that varies between 50.0 and 165.0° C., a pressure that varies between 0.0112 and 0.5602 kg/cm2, during a period of time that fluctuates between 1.5 and 60 seconds or, where appropriate, at a speed rate which varies between 0.01 and 6.00 m/s, while performing a new stretching, which should vary between 0.2 and 40.0% of the product's total potential expansion.