Heated cleaning articles using a calcium oxide and water heat generator
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Solution Overview
Problem
There is a lack of consumer products that provide convenient, safe, and automated self-heating cleaning articles capable of generating heat for improved cleaning efficacy, particularly in delivering heated cleaning compositions at the point of use.
Innovation Solution
The integration of a reactive metal oxide, such as calcium oxide, within a cleaning article that reacts with water to generate heat, combined with a venting structure to direct steam and water vapor for effective cleaning, addressing safety and control concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reactive metal oxide heat generator is integrated into a cleaning article, then cleaning efficacy is improved through heat generation, but safety concerns arise regarding uncontrolled temperatures and steam direction
Solution Approach 1:
A venting structure acts as an intermediary component between the heat generator and the external environment. This structure includes a vent that directs steam and water vapor away from the user, and a heat transfer member that mediates heat distribution to control temperatures. The venting structure serves as a safety intermediary that maintains cleaning efficacy while protecting against harmful thermal effects.
Solution Approach 2:
The heat generator is designed to be self-regulating through the natural physics of the exothermic reaction between calcium oxide and water. The reaction automatically controls its own temperature and steam generation without external intervention. The system serves itself by using the chemical energy stored in the calcium oxide to generate heat on demand, eliminating the need for external power sources or complex control systems.
2Temperature
If water is added to reactive metal oxide to generate heat, then heated cleaning composition is produced, but control over water amount and reaction intensity becomes difficult
Solution Approach 1:
The cleaning composition is pre-applied to the cleaning article before the heat activation step. This preliminary action ensures that the cleaning composition is already in position and properly distributed. When water is subsequently added to activate the heat generator, the user does not need to worry about controlling water amount for heating purposes, as the water is only needed to trigger the exothermic reaction, not to deliver the cleaning composition.
Solution Approach 2:
The water addition function is extracted from the heat generation control process. Instead of using water as both the heating medium and the reaction activator, the system separates these functions: the cleaning composition delivers the cleaning action, while a small amount of water merely triggers the heat reaction. This extraction simplifies operation by reducing the complexity of water amount control.
3Productivity
If steam is generated within the cleaning article, then cleaning performance is enhanced, but directional control of steam flow becomes challenging
Solution Approach 1:
The venting structure creates a localized steam flow path through the vent opening. Rather than attempting to control steam flow across the entire article, the design concentrates steam emission through a specific localized region. This local quality approach allows steam to be effectively directed toward the cleaning surface without requiring complex flow control mechanisms across the whole device.
Solution Approach 2:
The venting structure introduces a vertical dimension to steam flow control by positioning the vent to direct steam upward or outward from the heat generator. This dimensional approach to steam directionality simplifies the problem by using gravity and pressure differentials in the vertical axis rather than attempting to control horizontal steam flow across the article surface.
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 solution provides a safe and efficient means to generate heat within cleaning articles, enhancing cleaning efficacy by using steam and water vapor, while ensuring user safety through controlled temperature and directional steam emission.
Implementation Method 1
use of a reactive metal oxide (e.g., an oxide of an alkali or alkaline earth metal such as calcium oxide) and water to generate heat within the cleaning article
Implementation Method 2
control over directional flow of steam, water vapor and/or other vapors generated during use
Data Source
AI summary
Cleaning articles including a heat engine incorporated therein. The cleaning article may include a substrate (e.g., a non-woven wipe) including one or more layers. The heat engine may be in the wipe or pad, and includes a reactive metal oxide which upon contact with water, reacts to produce heat. The cleaning article may thus produce water vapor and/or steam upon activation of the heat engine. A venting structure may be provided adjacent to or surrounding the heat engine that includes an impermeable material (e.g., impermeable to water and/or air or other gas), which includes one or more vents through the impermeable material. The venting structure directs water vapor and/or steam to a desired face of the cleaning article, away from the user. A heat barrier layer may insulate a user's hand from the generated heat, and/or a handle may be attachable to the pad.