Compostable Nonwoven Wipe Substrate with Biodegradable Binder Fibers
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Solution Overview
Problem
Existing cleaning wipes are made from non-renewable, non-biodegradable materials that contribute to environmental waste, as they are typically used once and then discarded, necessitating the development of wipes with biodegradable and compostable substrates that maintain effectiveness in cleaning and disinfection.
Innovation Solution
Pre-loaded cleaning wipes featuring nonwoven substrates composed of natural fibers and synthetic biodegradable or compostable thermoplastic binder fibers, such as polyvinyl alcohol (PVOH) or polyvinyl acetate (PVA), which are designed to meet biodegradability standards and enhance extensibility, eliminating the need for additional adhesives and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional petrochemical binder fibers (polypropylene or PET) are used in spunlace nonwoven substrates, then the substrate achieves sufficient structural stability, but the extensibility is reduced due to melting during drying, and the materials are not biodegradable or compostable
Solution Approach 1:
The patent changes the material parameters by replacing traditional petrochemical binder fibers with biodegradable alternatives (polyvinyl alcohol, polyvinyl acetate, or degradable polyesters) that maintain structural stability while enabling compostability. This material substitution resolves the contradiction between structural reliability and environmental harm by selecting binder fibers that decompose under composting conditions yet provide sufficient binding strength during use.
Solution Approach 2:
The patent creates a composite nonwoven substrate combining natural fibers (cellulose, wood pulp, cotton, hemp, flax, or bamboo) with synthetic biodegradable binder fibers. This composite structure achieves both structural stability from the binder network and environmental compatibility from the natural fiber content, while the biodegradable binder ensures the entire substrate can be composted without leaving persistent synthetic waste.
2Ease of operation
If natural fibers are used in spunlace nonwoven substrates, then the substrate exhibits high extensibility, but replacing traditional binder fibers with biodegradable alternatives may compromise structural integrity
Solution Approach 1:
The patent adjusts the formulation parameters of the biodegradable binder fibers, specifically using polyvinyl alcohol or polyvinyl acetate which provide adequate binding strength while allowing natural fiber movement. The binder fiber composition and concentration are optimized to maintain structural integrity during normal use while permitting the extensibility characteristic of natural fibers to manifest.
3Object-generated harmful factors
If biodegradable binder fibers are used to meet compostability standards, then environmental impact is reduced, but the substrate may lack the durability needed for effective cleaning function
Solution Approach 1:
The patent employs a composite structure where natural fibers provide the bulk, absorbency, and cleaning surface area, while biodegradable binder fibers provide structural framework and durability. This composite approach ensures the substrate maintains cleaning effectiveness through adequate tensile strength and structural stability during use, yet fully composts after disposal since all components are biodegradable.
Solution Approach 2:
The patent optimizes the ratio and composition of binder fibers to achieve minimum durability thresholds required for cleaning effectiveness. By carefully selecting biodegradable binder types and concentrations, the substrate achieves sufficient mechanical strength for its intended cleaning function while maintaining complete biodegradability for environmental compatibility.
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 use of biodegradable substrates in cleaning wipes reduces environmental impact while maintaining effective cleaning and disinfection capabilities, adhering to biodegradability standards and providing enhanced extensibility and hand-feel characteristics.
Implementation Method 1
portions of the thermoplastic fibers may be melted or at least melt-softened (e.g., as a result of heating, but perhaps not to the resin's melting point), so as to bond the nonwoven structure together
Data Source
AI summary
Pre-dosed wipes and packaged systems of such wipes including a nonwoven substrate formed from natural pulp fibers and synthetic thermoplastic binder fibers comprising at least one of a biodegradable and/or compostable polyester, polyvinyl alcohol (PVOH), or polyvinyl acetate (PVA). The binder fibers, and the nonwoven substrate as a whole may meet any applicable biodegradability/compostability standard (e.g., ASTM D6400 or EN13432). The wipe may be substantially void of PLA. The fibers and/or nonwoven substrate may be meltblown, spunbond, spunlaid, SMS (spunbond-meltblown-spunbond), coformed, carded web, thermal bonded, thermoformed, spunlace, hydroentangled, hydroembossed, needled, or chemically bonded. A cleaning composition is loaded onto the wipe. A container can be provided within which the plurality of nonwoven substrates pre-dosed with the cleaning composition are packaged.