Macroalgae Pulp Sheet Strength via Controlled Drying
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Solution Overview
Problem
The processing of red algae fibers for papermaking is hindered by their high water content and hornification, leading to increased costs and compromised physical properties of paper products, making it difficult to use them as a substitute for wood pulp fibers.
Innovation Solution
Blending never-dried macroalgae fibers with conventional papermaking fibers to form a wet fiber web, which is then dried to create a dry pulp sheet with improved strength and durability, allowing for easier shipping, storage, and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If red algae fiber is dried to remove water for shipping and storage, then water retention cost is reduced, but fiber undergoes significant hornification that compromises tensile strength and makes repulping difficult
Solution Approach 1:
The patent changes the moisture content parameter of the red algae fiber from conventional high moisture (85%) to a controlled low moisture range (5-20%), and controls the drying parameters (temperature, time, atmosphere) to achieve this transformation without causing hornification. This parameter change resolves the contradiction by enabling low-cost shipping while preserving fiber strength.
Solution Approach 2:
The patent creates a composite material system by blending red algae fiber with conventional papermaking fibers (wood pulp, cotton, etc.) in specific ratios. This composite approach allows the red algae fiber to be processed and dried without hornification while maintaining overall paper strength, as the conventional fibers provide structural support during processing.
2Reliability
If red algae fiber is used as substitute for wood pulp, then environmental sustainability is improved, but hornification during drying compromises physical properties of paper products
Solution Approach 1:
The patent implements controlled drying parameters (temperature, humidity, time, atmosphere composition) to change the moisture removal process from conventional high-temperature drying to a gentler process. This parameter control prevents hornification while achieving the sustainability goal of using red algae as a renewable fiber source.
Solution Approach 2:
The patent applies preliminary treatments to the red algae fiber before drying (such as chemical treatments, enzymatic treatments, or mechanical pretreatments) to modify the fiber surface properties and prevent hornification during subsequent drying. This preliminary action preserves the fiber's physical properties while enabling sustainable paper production.
3Quantity of substance
If conventional drying processes are used on red algae pulp, then water removal is achieved, but the dried pulp cannot be disintegrated into useful form for papermaking
Solution Approach 1:
The patent changes the drying parameters from conventional high-temperature, rapid drying to controlled, low-temperature, gradual drying. This parameter change removes water while maintaining fiber separation and flexibility, enabling the dried pulp to be easily disintegrated and dispersed in papermaking processes.
Solution Approach 2:
The patent introduces intermediary substances or treatments during the drying process (such as chemical additives, enzymes, or mechanical intermediaries) that prevent fiber bonding and hornification. These intermediaries allow water removal while maintaining fiber dispersability for subsequent papermaking operations.
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 resulting pulp sheets exhibit enhanced tensile strength, durability, and dispersability, making them suitable substitutes for conventional papermaking fibers without compromising physical properties, and can be used to form tissue products with improved strength and stiffness.
Implementation Method 1
drying the fiber web to form dry pulp sheets
Data Source
AI summary
Novel pulps comprising conventional papermaking and macroalgae fibers are provided. By combining conventional papermaking fibers with never-dried macroalgae fibers, rather than dried macroalgae fibers, the disclosure provides pulp sheets having improved characteristics such as tensile and burst strength, with minimal deterioration in freeness.