Disposable Insole Pad with Pressure-Sensitive Adhesive
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Solution Overview
Problem
Current insole pads fail to effectively absorb moisture and reduce odor without damaging the original shoe insole, and often require cutting to fit, posing safety hazards and being inconvenient for daily use, especially in minimalist shoes.
Innovation Solution
A disposable insole pad with a multilayer structure comprising a topsheet, absorbent layer, and pressure-sensitive adhesive, allowing for easy positioning, repositioning, and removal without damaging the original insole, and designed for daily use with features like a release liner and silicone release agent for easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insole pads are permanently or irremovably attached to the original shoe insole, then odor reduction is improved, but the original insole is damaged and cannot be reused
Solution Approach 1:
The patent employs disposable insole pads that are designed for single-use or limited-use periods. These pads are inexpensive enough to be replaced regularly without damaging the original insole, solving the contradiction by using temporary, discardable attachments rather than permanent fixtures that would harm the underlying structure.
Solution Approach 2:
The adhesive layer acts as an intermediary between the insole pad and the original insole. It provides temporary attachment sufficient for odor reduction during the pad's service life, but allows for clean removal without damaging the original insole fabric or structure, thus mediating between the need for attachment and the need to preserve the original insole.
2Ease of manufacture
If universal sizing insoles are used, then manufacturing cost is reduced, but the user must cut-to-fit which is time consuming and unsafe
Solution Approach 1:
The patent offers insole pads in multiple pre-determined sizes rather than a single universal size. This allows manufacturers to produce standardized products at low cost while giving users the ability to select the appropriate size without cutting, eliminating the safety hazards and time consumption associated with cutting-to-fit while maintaining manufacturing efficiency.
3Reliability
If thick insoles with activated charcoal laminate are used, then odor absorption is improved, but they are not suited for tight fitting shoes or open-style shoes
Solution Approach 1:
The insole pad is divided into functional layers with different thicknesses and properties. The topsheet and absorbent layers provide odor absorption and moisture management, while the overall structure remains thin enough to fit in various shoe types. This segmentation allows the product to maintain high odor absorption capability while achieving the thin profile needed for versatility across different footwear styles.
4Duration of action of stationary object
If insoles are removed and washed by hand, then reuse is possible, but the process is time consuming and impractical for daily basis
Solution Approach 1:
The patent employs disposable insole pads designed for single-use or limited-use periods. This eliminates the need for washing and drying processes entirely, as the pads are replaced rather than cleaned. The low cost of the disposable pads makes this economically viable, solving the contradiction by removing the time-consuming washing step while maintaining effective odor protection through regular replacement.
5Productivity
If synthetic materials are used in insole manufacturing, then production efficiency is improved, but washing and drying distort the insole's form preventing re-use
Solution Approach 1:
The patent uses disposable insole pads made from synthetic materials that can be manufactured efficiently. Since the pads are designed for single-use, shape distortion from washing is not an issue - the pads are replaced before any significant degradation occurs. This resolves the contradiction by making the insole's service life shorter than the time required for washing and drying, eliminating the need for shape retention during laundering.
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 disposable insole pad effectively absorbs moisture, reduces odor, and can be used daily without damaging the original shoe insole, enhancing foot hygiene and safety by allowing easy attachment and detachment without the need for cutting.
Implementation Method 1
The adhesive is a pressure sensitive adhesive, having a storage modulus (G′) of less than 1×105 Pascal at 40° C.
Implementation Method 2
an absorbent layer
Implementation Method 3
The topsheet may further comprise an absorbent layer
Data Source
AI summary
Disposable insole pads and use thereof are disclosed. The disposable insole pads are multilayer structures comprising a topsheet and a pressure sensitive adhesive, and optionally a backsheet, silicone coating and liner layers. The pressure sensitive adhesive layer allows the disposable insole pads to be positioned, repositioned and removed, making them well suited for daily use and disposal.