Unbleached Brown Copier Paper Composition With Recycled Fiber Strength
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Solution Overview
Problem
The paper industry faces challenges in reducing water and chemical usage during paper production, particularly in bleaching processes, while maintaining paper quality and strength, especially with recycled fibers.
Innovation Solution
The production of unbleached natural brown copier paper using pulp extracted from waste paper materials, such as old corrugated cartons and sorted office paper, combined with starch and fillers, eliminates the need for bleaching chemicals and significantly reduces water consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If bleaching chemicals are used to produce white paper, then paper brightness and appearance quality are improved, but water consumption and chemical pollution increase
Solution Approach 1:
The invention extracts and eliminates the bleaching process entirely from the paper production system. By accepting and utilizing the natural brown color of recycled fibers, the patent removes the need for hydrogen peroxide, sodium bisulphite, and other bleaching chemicals, thereby eliminating associated water consumption and chemical pollution while still producing acceptable copier paper
Solution Approach 2:
The invention converts the typically harmful aspect of brown color in recycled paper (considered a defect requiring bleaching) into a beneficial feature. The natural brown color becomes acceptable and even desirable for copier paper applications, eliminating the need for harmful bleaching processes while maintaining product functionality
2Object-generated harmful factors
If recycled fibers are used to reduce cost and environmental impact, then production cost and pollution are reduced, but paper dry-strength deteriorates
Solution Approach 1:
The invention creates a composite paper structure by combining recycled fibers with specific ratios of virgin pulp (30-70%) and adding starch (0.5-5%) and filler (10-40%). This composite approach maintains dry-strength requirements while preserving the environmental and economic benefits of recycled fiber usage
Solution Approach 2:
The invention changes the compositional parameters of the paper by controlling the ratio of recycled to virgin fibers (30-70% virgin pulp), adding starch content (0.5-5%), and optimizing filler content (10-40%). These parameter adjustments ensure adequate dry-strength while maintaining the benefits of recycled material usage
3Loss of substance
If water recovery systems are implemented to reduce water usage, then water consumption is reduced, but investment cost increases
Solution Approach 1:
The invention extracts and eliminates the need for complex water recovery systems by removing the bleaching process entirely. Without bleaching chemicals requiring treatment and recovery, the system avoids significant capital investment in effluent treatment plants while still achieving reduced water consumption through process simplification
Data Source
AI summary
The present invention discloses a composition of an unbleached natural brown copier paper without using any bleaching chemicals or dyes comprising of pulp extracted from waste paper material of corrugated cartons, starch, and fillers. It further includes AKD (Alkyl Ketene Dimer) and enzymes. The waste paper material includes the percentage of 30% to 60% old Indian corrugated cartons (OCC), 20% to 70% old imported corrugated cartons (OCC) and 20% to 50% white record/sorted office paper (SOP).