Water-Dispersion Paper Neutral pH High Alpha-Cellulose Pulp
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Solution Overview
Problem
Existing water dispersion papers face challenges such as alkalinity issues, difficulty in achieving quick water dispersion, and poor printability due to alkaline pH, weak inter-fiber bonding, and excessive alkalization, which limits their applications in plant, animal, medical, and food-related uses, and causes issues with film lamination and printing processes.
Innovation Solution
A water dispersion paper made from wood pulp or non-wood pulp with 15-95% purified pulp containing 88% or more α-cellulose, ensuring a neutral pH range of 6-8, and excluding regenerated cellulose fibers and carboxymethyl cellulose, which enhances strength and quick water dispersion without the need for alkalization agents, and includes a water-soluble sealer layer to prevent permeation and maintain adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If water dispersion paper is made by mixing papermaking fibers and fiber carboxymethyl cellulose with alkali metal compound, then water dispersion property is improved, but paper surface pH becomes alkaline (pH 8.8) which limits applications in food, medical, and plant uses
Solution Approach 1:
The patent changes the chemical composition parameters by using purified pulp with high α-cellulose content (88% or more) and controlling hemi-cellulose content (less than 12%), thereby achieving neutral pH (6-8) while maintaining water dispersion properties without requiring alkali metal compounds
Solution Approach 2:
The patent extracts and eliminates the harmful alkaline components (fiber carboxymethyl cellulose and alkali metal compounds) from the paper composition, using only purified pulp and water to achieve the desired water dispersion effect without alkalinity
2Speed
If conventional water dispersion paper is used, then quick water dispersion is achieved, but printability deteriorates due to alkaline pH and weak inter-fiber bonding
Solution Approach 1:
The patent uses a composite structure consisting of purified pulp with specific α-cellulose and hemi-cellulose content ratios, creating a material that simultaneously provides quick water dispersion and excellent printability through optimized fiber bonding without alkaline additives
3Object-affected harmful factors
If excessive alkalization agent is added to achieve neutral pH, then paper surface pH becomes neutral (pH 6-8), but yellowing and discoloration occur over time
Solution Approach 1:
The patent eliminates the need for alkalization agents by using purified pulp with controlled composition (α-cellulose ≥88%, hemi-cellulose <12%), thereby achieving neutral pH without the harmful side effect of yellowing and discoloration that occurs with excessive alkalization
Solution Approach 2:
The patent uses purified pulp as a natural, short-lived material that decomposes cleanly without leaving residual alkaline substances that cause yellowing, replacing the need for chemical alkalization agents
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 paper achieves excellent water dispersion, high strength, and improved printability, preventing yellowing and discoloration, making it suitable for applications like food trays, confidential documents, and returnable containers, while ensuring efficient cleaning and disposal without alkaline residues.
Implementation Method 1
purified pulp containing α-cellulose by 88 percent by weight or more and containing hemi-cellulose by less than 12 percent by weight accounts for 15 to 95 percent by weight of all pulp
Implementation Method 2
the paper achieves excellent water dispersion, high strength, and improved printability
Data Source
AI summary
An object of the present invention is to provide a water dispersion paper having quick water dispersion property and high strength (printability) and whose paper surface pH is 6 to 8 (neutral range), and also to provide a water dispersion coated paper designed to ensure quick water dispersion property and prevent discoloration over time. A water dispersion paper made of wood pulp and/or non-wood pulp, wherein said water dispersion paper is characterized in that purified pulp containing α-cellulose by 88 percent by weight or more accounts for 15 to 95 percent by weight of all pulp, as weii as a water dispersion coated paper having a water-soluble coating layer on said water dispersion paper.