Wet Wipe Package Inversion for Uniform Lotion Distribution
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Solution Overview
Problem
Wet wipes in stacks often develop a wetness gradient due to gravity, leading to uneven lotion distribution, with top wipes becoming dry and bottom wipes becoming over-saturated, which is undesirable for consumer satisfaction and increases manufacturing complexity.
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 wetness gradient, thereby achieving a more uniform lotion distribution throughout the stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet wipes are stacked in packages for storage and shipping, then the wipes can be conveniently stored and dispensed, but a wetness gradient develops over time due to gravity causing uneven lotion distribution
Solution Approach 1:
The patent applies inversion by periodically flipping the stack of wet wipes from an upright position to an inverted position and back. This reverses the direction of gravitational pull on the lotion, allowing it to redistribute from the bottom wipes (which become over-saturated) back toward the top wipes (which become drier), thereby reducing the wetness gradient and achieving more uniform lotion distribution throughout the stack.
2Ease of operation
If the stack orientation is kept fixed during storage, then handling is simple, but the wetness gradient increases making the product less satisfactory
Solution Approach 1:
The patent implements periodic action by establishing a predetermined turning schedule that periodically inverts the stack orientation during storage. This periodic inversion redistributes the lotion throughout the stack at intervals, preventing excessive wetness gradient formation while maintaining relatively simple handling procedures. The schedule balances the need for uniform wetness with operational simplicity by performing inversions at optimized time intervals.
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 consistent wetness ratio closer to one, enhancing consumer satisfaction by maintaining uniform wetness and reducing manufacturing complexity.
Implementation Method 1
as the stack is at rest (e.g., during storage), when gravity draws liquid components of the lotion downward
Implementation Method 2
Inverting the stack of wet wipes according to a predetermined schedule allows a second wetness gradient to form
Data Source
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AI summary
A method for improving the wetness gradient of a plurality of packages containing stacks of wet wipes, and the associated container, are disclosed. The method may include the steps of providing a plurality of packages of wet wipes, disposing the primary packages in the interior space of a container bearing an indicium that is easily legible when the container is upside-down, inverting the container and thereby the packages to the upside-down orientation, and shipping the container in the upside-down position. The associated product may be the container bearing the indicium and containing the packages of wet wipes.