Flip-Flop Sole Heat-Pressed Strap Attachment
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Solution Overview
Problem
Flip-flops with moulded straps secured to flexible soles often experience the strap detaching easily due to the knobs coming free of the holes, leading to a lack of secure attachment when worn.
Innovation Solution
A sole made of resilient foam material with gas pockets is used, featuring through-holes that are heat-pressed to form depressions on the outsole surface, reducing the resilience of the foam material around the holes, creating cradles for the strap knobs, which prevents the knobs from easily detaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sole is made of flexible foam material, then comfort and cushioning are improved, but the strap attachment security deteriorates
Solution Approach 1:
The patent applies local quality by creating heat-pressed depressions at specific locations where the straps attach to the sole. These depressions locally increase the density and reduce the resilience of the foam material only in the attachment zones, while the rest of the sole maintains its original flexible and cushioning properties. This localized modification allows the strap knobs to be securely held in the depressions without compromising the overall comfort of the footwear.
Solution Approach 2:
The patent employs preliminary action by pre-forming the heat-pressed depressions in the sole before the strap is attached. This preliminary structural preparation creates predetermined secure attachment points that guide and secure the strap knobs in place, preventing them from easily detaching during use. The depressions are created in advance to ensure reliable strap attachment before the product reaches the consumer.
2Reliability
If the foam material is heat-pressed to form depressions, then strap attachment security is improved, but the sole material resilience deteriorates
Solution Approach 1:
The heat-pressing process is applied locally only to the areas where strap attachment is required, creating discrete depressions with increased density and reduced resilience. The majority of the sole material remains unmodified and retains its original foam structure, gas pockets, and cushioning characteristics. This localized treatment ensures that the structural changes are confined to the attachment zones while preserving the overall resilience and comfort properties of the footwear.
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 heat-pressed foam material around the depressions provides a secure attachment of the strap to the sole, resisting tugging forces and maintaining the sole's resilience for comfort, preventing the strap from detaching.
Implementation Method 1
the foam material forming the sides of each depression being heat-pressed such that the foam material is compressed and the gas in the gas pockets are released
Implementation Method 2
the foam material is compressed and the gas in the gas pockets are released
Implementation Method 3
the foam material is compressed and the gas in the gas pockets are released
Data Source
AI summary
A flip-flop or slipper which has a sole that has holes for receiving the knobs on a strap. The holes are heat-treated to reduce the resilience of the sole material at the sides of the holes. This prevents the knobs from squeezing through the holes and thus prevents the strap from disengaging the sole.