Foldable Flow-Guide Unit for Sanitary Napkin Leakage Prevention
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Solution Overview
Problem
Existing sanitary napkins have slow absorption rates due to the design of flow-guide strips connected to outer cover pieces, which hinder the quick absorption of menstrual blood, especially when the user's posture changes during sleep, leading to potential leakage.
Innovation Solution
A sanitary napkin design featuring a main pad body with a flow-guide unit consisting of two flow-guide members directly connected to the absorbent body, allowing for rapid absorption and extended contact with the buttocks, along with liquid-blocking portions that can be turned inside out to increase the absorbing area and prevent displacement during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow-guide strip is connected to the outer cover piece, then the flow-guide strip can be positioned at the intergluteal cleft to prevent leakage, but the menstrual blood must pass through the outer cover piece before being absorbed, resulting in slow absorption rate
Solution Approach 1:
The flow-guide unit is extracted from the outer cover piece structure and made independent, allowing it to be directly connected to the absorbent body. This separation enables the flow-guide unit to quickly guide menstrual blood to the absorbent body without the delay of passing through the outer cover piece, while still maintaining its positioning function at the intergluteal cleft
Solution Approach 2:
The flow-guide unit serves as an intermediary component between the menstrual blood source and the absorbent body. By being directly connected to the absorbent body, it creates a direct pathway for blood flow, acting as an efficient mediator that eliminates the need for blood to penetrate the outer cover piece first
2Ease of operation
If the flow-guide strip is connected to the liquid-blocking piece, then the flow-guide strip can be pulled upward to quickly absorb menstrual blood, but the blood must first pass through the liquid-blocking piece and outer cover piece, resulting in slow absorption rate
Solution Approach 1:
The flow-guide unit is extracted from the layered structure of liquid-blocking piece and outer cover piece, and directly connected to the absorbent body. This allows the pull string mechanism to work more efficiently by directly moving the flow-guide unit into contact with the absorbent body without requiring blood to traverse multiple layers first
Solution Approach 2:
The flow-guide unit is pre-connected to the absorbent body, so that when the pull string is pulled, the flow-guide unit is immediately positioned to receive and guide menstrual blood directly to the absorbent body, eliminating the delay caused by blood needing to pass through intermediate layers
3Volume of moving object
If the flow-guide sections are stacked in a folded position, then the flow-guide unit has a compact structure, but the outer junction sections cannot contact the buttocks to provide extended protection
Solution Approach 1:
The flow-guide unit is designed with foldable sections that can dynamically change from a compact stacked state to an extended state. When needed, the flow-guide sections can be unfolded so that the outer junction sections contact the buttocks, providing extended protection while maintaining compact storage when not in use
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 enhances absorption capacity, maintains dryness, and prevents leakage even with changing postures, while providing ventilation and comfort through direct connection to the absorbent body and adjustable pull piece for optimal fit.
Implementation Method 1
the bottom ends of the flow-guide members are connected to a top surface of the absorbent body... the menstrual blood absorbed by the flow-guide strip 12 can be directly and quickly guided to the absorbent body 13
Data Source
AI summary
A sanitary napkin includes a main pad body having an absorbent body, and a flow-guide unit including two flow-guide members having bottom ends connected to a top surface of the absorbent body, and a pull piece connected to top ends of the flow-guide members. Each flow-guide member includes a plurality of flow-guide sections foldably connected to each other, and a plurality of outer junction sections each formed between outer ends of two adjacent ones of the flow-guide sections. The pull piece is pulled to move the flow-guide sections relative to the absorbent body from a folded position, in which the flow-guide sections are stacked one upon the other, to an extended position, in which the outer junction sections of the flow-guide members are configured to contact the buttocks of a user.