PVA Dryer Sheet Composition for Wrinkle and Odor Control
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Solution Overview
Problem
Existing dryer sheets have limited effectiveness in preventing wrinkling of garments during the drying process and lack sanitizing properties, requiring high temperatures to activate fabric softening agents.
Innovation Solution
A wrinkle reducing dryer sheet comprising a polyvinyl alcohol substrate, an absorbent flexible non-woven substrate saturated with a combination of hydrophobic and hydrophilic cationic ingredients, and a water impermeable adhesive layer, which reduces fabric wrinkling and provides deodorizing properties when used in rotary clothes dryers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dryer sheets are used, then fabric softening is achieved, but wrinkle prevention effectiveness is limited and sanitizing properties are absent
Solution Approach 1:
The patent changes the chemical parameters of the dryer sheet composition by incorporating specific concentrations of cationic ingredients (0.1-10% w/w), hydrophobic modifiers (0.01-5% w/w), and antimicrobial agents (0.01-5% w/w). These parameter changes enable the composition to provide both wrinkle prevention and sanitizing properties simultaneously, resolving the contradiction between limited wrinkle prevention and need for improved effectiveness.
Solution Approach 2:
The patent creates a composite dryer sheet composition that combines multiple functional ingredients: cationic softening agents, hydrophobic modifiers for controlled release, and antimicrobial compounds. This composite material approach allows the single dryer sheet to deliver fabric softening, wrinkle prevention, and sanitizing effects together, addressing the limitation of conventional sheets that provide only basic softening.
2Reliability
If high temperature is used to activate fabric softening agents, then softening effect is achieved, but energy consumption increases and fabric damage risk increases
Solution Approach 1:
The patent modifies the physical and chemical parameters of the softening agent composition, specifically incorporating hydrophobic modifiers that lower the melting point and enable release at reduced temperatures. The cationic ingredients are formulated to become active at lower temperatures than conventional agents, allowing effective fabric softening without requiring high temperature activation, thus reducing energy consumption and fabric damage risk.
Solution Approach 2:
The patent utilizes controlled phase transition of the fabric softening composition from solid to liquid state at lower temperatures through the incorporation of hydrophobic modifiers. This phase transition mechanism allows the softening agents to be released and become active at reduced temperatures compared to conventional high-temperature activation requirements, resolving the contradiction between softening effectiveness and temperature/energy requirements.
3Reliability
If conventional dryer sheets are used, then static neutralization is achieved, but deodorizing and antimicrobial properties are lacking
Solution Approach 1:
The patent designs a universal dryer sheet composition that performs multiple functions simultaneously: cationic ingredients provide static neutralization and fabric softening, hydrophobic modifiers enable controlled release, and antimicrobial compounds provide deodorizing and sanitizing properties. This multi-functional composition resolves the contradiction by adding deodorizing capabilities while maintaining the original static neutralization effectiveness of conventional sheets.
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 combination of polyvinyl alcohol and hydrophilic/hydrophobic cationic ingredients significantly decreases fabric wrinkling, while the antimicrobial properties enhance fabric softness and freshness, reducing the need for ironing and improving odor control.
Implementation Method 1
a relatively high temperature is required in order to activate the softening or other fabric treating agent on the non-woven sheet and release it into the fabric of the clothing
Implementation Method 2
The composition on the sheet of non-woven material is released in the course of the drying cycle as a result of the heat within the clothes dryer, and contact with the clothing induced by the tumbling action of the dryer
Implementation Method 3
contact with the clothing induced by the tumbling action of the dryer
Implementation Method 4
at least one water impermeable adhesive layer having a thickness of from 0.1 to 2 mils between the first outer layer and the second outer layer
Data Source
AI summary
Provided are wrinkle reducing and deodorizing dryer sheets and methods of making and using the dryer sheets. In one form of the dryer sheet, the wrinkle reducing and deodorizing dryer sheet includes an absorbent wet substrate in sheet form with a polyvinyl alcohol sheet adhered to one surface of the substrate. In another form the PVA sheet is added separately from that of the absorbent wet substrate sheet. The PVA sheet is preferably in the form of an uncoated non-woven of a thickness of 8 mil or less. The wet impregnated sheet contains a solution of quaternary ammonium salts of different water solubility. The method for using, the wrinkle reducing and deodorizing dryer sheet is added to a rotary dryer with a load of wet or dried garments to reduce wrinkling in the garments during the drying process, reduce static cling and refresh the treated clothing.