Pet absorbent sheet with segmented waterproof regions
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Solution Overview
Problem
Existing pet absorbent sheets struggle to accurately indicate the spread of urine, leading to difficulties in determining when to replace the sheet and potentially causing pets to excrete outside the absorbent area.
Innovation Solution
A pet absorbent sheet design featuring a liquid-permeable top sheet with hydrophilic fibers and strategically placed waterproof regions containing a water-resistant agent, which repel urine and maintain a distinct appearance before and after excretion, allowing for clearer visualization of the excretion area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the liquid-permeable sheet is made entirely of hydrophilic fibers to improve urine absorption, then the absorption capacity is improved, but the ability to indicate the range of excrement deteriorates
Solution Approach 1:
The liquid-permeable sheet is segmented into multiple regions with different properties: waterproof regions containing water-resistant agents that repel urine and maintain visual contrast, and hydrophilic regions that absorb urine. This segmentation allows simultaneous achievement of high absorption capacity and clear visual indication of excrement range.
Solution Approach 2:
Different regions of the liquid-permeable sheet are assigned different local qualities: some regions have water-resistant properties for visual indication, while other regions have hydrophilic properties for absorption. This local differentiation resolves the contradiction between absorption capacity and visibility.
2Loss of information
If waterproof regions are added to indicate excrement range, then the visibility of excrement area is improved, but the device complexity increases
Solution Approach 1:
The waterproof regions are merged into the liquid-permeable sheet as an integrated structure rather than a separate component. The water-resistant agents are incorporated directly into the sheet material, combining the indication function with the existing absorption structure and avoiding additional complex components.
Solution Approach 2:
The liquid-permeable sheet uses composite material structure combining hydrophilic fibers for absorption and water-resistant agents for visual indication. This composite approach integrates multiple functions within a single material system, reducing overall device complexity.
3Reliability
If the water resisting agent surrounds gaps between fibers, then urine repulsion in waterproof regions is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The water-resistant agents are applied to the liquid-permeable sheet in a way that they automatically surround the gaps between fibers through capillary action and surface tension. This self-organizing behavior reduces the need for precise manual positioning and simplifies the manufacturing process while ensuring effective urine repulsion.
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 design effectively differentiates the excretion area from non-excretion regions through distinct light transmission and reflection characteristics, facilitating easier identification of urine spread and extending the sheet's usability by containing excrement within the absorbent core.
Implementation Method 1
a plurality of waterproof regions including a water resisting agent that is partially provided in the liquid-permeable sheet
Implementation Method 2
a liquid-permeable sheet that is provided closer to a top side than the absorbent core and includes a plurality of hydrophilic fibers
Data Source
AI summary
A pet absorbent sheet includes: an absorbent core; and a liquid-permeable sheet disposed closer to a top side of the pet absorbent sheet than the absorbent core and that includes a plurality of hydrophilic fibers. The liquid-permeable sheet has waterproof regions that contain a water resisting agent. The water resisting agent is formed to surround gaps between fibers formed of the plurality of hydrophilic fibers.