Wiping sheet and method for manufacturing wiping sheet
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Solution Overview
Problem
Existing methods for forming patterned parts on nonwoven fabrics, such as spunlace and heat embossing, face challenges in creating unevenness and require large-scale equipment, making it difficult to easily form desired patterns.
Innovation Solution
A wiping sheet is manufactured by applying a cellulose nanofiber solution to a nonwoven fabric, forming a patterned part with a higher fiber density through thermal drying, creating unevenness by heat shrinkage, while the non-patterned part maintains a lower fiber density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the spunlace method or heat embossing process is used to form patterned parts on nonwoven fabric, then patterned parts can be formed, but it is difficult to form unevenness and requires large scaled equipment
Solution Approach 1:
The invention changes the material parameter by introducing cellulose nanofiber into the nonwoven fabric at specific locations. This material parameter change causes local fiber density increase and shrinkage during drying, forming unevenness without requiring complex equipment. The cellulose nanofiber concentration and distribution are controlled to achieve desired unevenness patterns.
Solution Approach 2:
The invention replaces the mechanical system of spunlace or heat embossing equipment with a chemical/biological system. Instead of using mechanical entanglement or thermal embossing, the invention uses cellulose nanofiber application and natural drying shrinkage to form unevenness, eliminating the need for large scaled equipment.
2Reliability
If patterned parts are formed to create unevenness, then wiping properties are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention applies preliminary action by pre-coating the nonwoven fabric with cellulose nanofiber solution in the desired pattern before the main manufacturing process. This preliminary step allows the fabric to develop unevenness naturally during drying, simplifying the overall manufacturing process while ensuring consistent wiping properties.
Solution Approach 2:
The invention employs self-service by allowing the cellulose nanofiber-coated fabric to form unevenness automatically during the natural drying process. The shrinkage and density changes occur self-driven without additional mechanical intervention, simplifying manufacturing while creating the desired patterned structure for improved wiping.
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 method enables easy formation of unevenness on nonwoven fabrics, providing enhanced wiping and scraping properties with a soft, smooth surface for finishing, achieving both thickness and softness in a single sheet.
Implementation Method 1
thermal drying of the nonwoven fabric to which the cellulose nanofiber solution has been applied
Data Source
AI summary
A wiping sheet includes a patterned part of a fiber assembling base material and a non-patterned part of the fiber assembling base material. The patterned part includes cellulose nanofiber; and the non-patterned part does not include the cellulose nanofiber.