Soap Capsule Sponge Structure for Pressure-Controlled Release
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Solution Overview
Problem
Existing wash sponges with inner soap capsules experience uncontrolled flow of liquid soap due to user pressure, leading to soap flow even when the sponge is already sudsy and saturated.
Innovation Solution
The sponge design features a sealed capsule with pressure-sensitive holes that remain closed under vertical pressure (normal use) and open under horizontal pressure (intentional squeezing), allowing controlled soap flow, using a pliable material like rubber or silicone for the capsule and a nylon bag with specific hole diameters and arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the capsule is made pliable to allow soap flow through holes, then soap can be released into the sponge, but uncontrolled soap flow occurs under user pressure
Solution Approach 1:
The holes in the capsule are designed to dynamically change their state between open and closed based on the direction of applied pressure. When pressure is applied from the sides (horizontal direction), the holes open to allow soap flow. When pressure is applied from top to bottom (vertical direction during normal use), the holes remain closed. This dynamic response to different pressure directions resolves the contradiction by enabling controlled soap release while preventing uncontrolled flow during normal sponge usage.
2Ease of operation
If holes are made larger to facilitate soap flow, then soap releases more easily, but soap flows uncontrollably during normal use
Solution Approach 1:
Different regions of the capsule experience different pressure conditions during use. The holes are positioned and oriented such that they are subject to lateral pressure from the sponge material during normal use, which keeps them closed. When the user intentionally squeezes the capsule from the sides, the local pressure distribution changes, opening the holes to allow soap flow. This localized pressure sensitivity enables controlled soap release without uncontrolled flow during normal usage.
3Ease of operation
If the capsule material is made more flexible to allow squeezing, then intentional soap release is easier, but the capsule deforms under normal use pressure
Solution Approach 1:
The capsule is designed with asymmetric mechanical properties: it is highly flexible in the horizontal direction to allow easy squeezing and soap release, but maintains structural stability in the vertical direction to resist deformation during normal use. This asymmetric flexibility is achieved through the capsule's geometric design and material selection, allowing it to be easily compressed from the sides while maintaining its overall shape and position within the sponge during normal usage conditions.
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 design prevents significant soap flow during normal use, ensuring soap is only released when intentionally squeezed, maintaining sponge functionality and user control over soap distribution.
Implementation Method 1
The capsule (2) is made from a pliable material so that squeezing the capsule causes the soap to flow out through the holes in the capsule
Data Source
AI summary
A method of manufacturing a sponge with inner capsule that contains soap. The method includes: Providing a scouring pad coating sleeve, a first and second strip of inner sponge, and a nylon sleeve which is divided into a serial of capsules. Providing a tray that ended with a hollow pipe and placing on it the first strip, then the nylon sleeve and then the second strip. Dressing up the scouring sleeve on the hollow pipe. Pushing the strips together with the nylon sleeve inside the hollow pipe until their front goes out through the hollow pipe, holding them together and pulling them outside of the hollow pipe until they are positioned inside the scouring sleeve. Welding and cutting the scouring sleeve to pieces according the size of the capsules.