Wet Wipe Package Turning Schedule for Wetness Gradient Control
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Solution Overview
Problem
Wetness gradients in stacks of wet wipes lead to uneven lotion distribution, causing consumer complaints of dryness, as the composition migrates to the bottom of the stack during storage, resulting in over-saturation of lower wipes and dryness of upper wipes.
Innovation Solution
Inverting the stack of wet wipes according to a predetermined schedule allows a second wetness gradient to form, reducing the initial steady-state gradient from values greater than 1.5 to 1.3 or less, by altering the migration pattern of the composition through chromatography-like effects within the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wet wipes are stored in a stack with composition applied, then the wipes are pre-moistened for ease in cleaning and disinfecting, but a wetness gradient develops causing uneven lotion distribution with lower wipes over-saturated and upper wipes dry
Solution Approach 1:
The patent applies inversion by turning the stack of wet wipes upside down at predetermined intervals during storage. This reverses the gravitational direction of composition migration, allowing the gradient to be reduced over time. The stack is inverted multiple times (e.g., every few days) to progressively equalize the lotion distribution throughout the stack, transforming the harmful gradient into uniform distribution.
2Manufacturing precision
If the stack is inverted multiple times during storage, then wetness gradient is reduced and lotion distribution is equalized, but additional handling operations and storage time are required
Solution Approach 1:
The patent applies preliminary action by performing the inversion operations during the storage period before the wipes are dispensed to consumers. The stack is inverted at predetermined intervals (e.g., every 2-5 days) during warehouse or retail storage, equalizing the lotion distribution before the product reaches the consumer. This ensures uniform wetness is achieved in advance, eliminating the need for post-storage intervention.
3Manufacturing precision
If the stack is inverted frequently, then wetness gradient reduction is enhanced, but handling complexity and operational effort increase
Solution Approach 1:
The patent applies self-service by designing the inversion process to be performed by existing warehouse or retail staff as part of their routine inventory handling, without requiring specialized equipment or complex procedures. The stack is simply turned upside down and placed back, a operation that can be easily integrated into existing workflows. This minimizes additional operational complexity while achieving the desired wetness equalization.
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
This method significantly reduces the wetness gradient, ensuring a more uniform lotion distribution throughout the stack, improving consumer satisfaction by maintaining a wetness ratio closer to 1, thus preventing dryness issues.
Implementation Method 1
by altering the migration pattern of the composition through chromatography-like effects within the substrate
Implementation Method 2
as the composition migrates to the bottom of the stack during storage
Data Source
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AI summary
A method of reducing a wetness gradient development for a package of wet wipes is provided. The method includes, after wet wipes are enclosed within a package to form the package of wet wipes, locating the package of wet wipes in a first orientation such that a first side of the package of wet wipes faces downward and an opposite second side of the package of wet wipes faces upward to form a first wetness gradient after a preselected amount of time. Prior to opening the package of wet wipes to access the wet wipes enclosed within the package of wet wipes, inverting the package of wet wipes according to a predetermined turning schedule to place the package of wet wipes in a second orientation such that the first side of the package of wet wipes faces upward and the second side of the package of wet wipes faces downward to form a second wetness gradient that is different from the first wetness gradient.