Modified Starch Binder for Dry Paper Compacts
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Solution Overview
Problem
Existing methods for manufacturing paper using a dry process without water face challenges in achieving binding properties when replacing synthetic resins with natural materials like starch, requiring significant moisture addition, which increases environmental loading and energy consumption.
Innovation Solution
A method involving mixing cellulose fibers with a binder powder having a specific surface area of 0.2 m²/g or more, followed by humidification and heating to form a compact, where the binder, such as starch or dextrin, effectively binds fibers at low moisture levels, enhancing mechanical strength and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If natural binder materials like starch are used to replace synthetic resins, then environmental loading is reduced, but a relatively large amount of moisture must be added to achieve binding properties between fibers
Solution Approach 1:
The invention changes the physical-chemical parameters of the binder by using modified starch with specific properties (specific surface area of 0.2 m²/g or more, viscosity of 100-10,000 cP at 20°C). These parameter modifications enable the binder to achieve effective fiber binding at low moisture levels (5-30 mass%), resolving the contradiction between environmental friendliness and moisture requirement
Solution Approach 2:
The invention creates a composite material system combining cellulose fibers with modified starch binder, where the starch undergoes specific modifications (acetylation, oxidation, or crosslinking) to achieve optimal binding properties. This composite approach allows natural materials to replace synthetic resins while maintaining binding effectiveness at low moisture content
2Reliability
If a relatively large amount of moisture is added for developing binding properties with natural materials, then binding properties between fibers are achieved, but energy consumption increases
Solution Approach 1:
By modifying the starch binder parameters (specific surface area ≥0.2 m²/g, controlled viscosity, and specific gelatinization temperature), the invention enables effective fiber binding at low moisture content (5-30 mass%). This reduces the energy required for moisture evaporation while maintaining reliable binding properties, resolving the contradiction between binding effectiveness and energy consumption
3Reliability
If synthetic resin is used as a binder, then binding properties are achieved with low moisture, but environmental loading increases
Solution Approach 1:
The invention replaces durable synthetic resins with biodegradable modified starch binder that can be derived from renewable resources. The starch undergoes modifications to achieve binding effectiveness comparable to synthetic resins, but with the advantage of being environmentally friendly and biodegradable, resolving the contradiction between binding reliability and environmental loading
Solution Approach 2:
The invention creates a composite material system using modified starch (with specific surface area ≥0.2 m²/g and controlled viscosity) combined with cellulose fibers. This natural-based composite replaces synthetic resin composites while maintaining binding effectiveness through the modified starch's enhanced surface properties and controlled rheology
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 the production of a compact with excellent mechanical strength and biodegradability while reducing environmental impact and energy consumption by using a natural binder that binds fibers efficiently at low moisture levels.
Implementation Method 1
a binder binds between fiber molecules by the addition of water
Implementation Method 2
a forming step of heating and pressurizing the water-added web to obtain a compact
Implementation Method 3
a pressure application part that applies pressure in the thickness direction on a deposit obtained by depositing the raw-material fiber
Data Source
AI summary
A method for manufacturing a compact includes a mixing step of mixing a fiber and a powder of a binder to obtain a mixture; an accumulating step of accumulating the mixture to form a web; a humidifying step of adding water to the web; and a forming step of heating and pressurizing the water-added web to obtain a compact. The binder binds between fiber molecules by the addition of water. The powder has a specific surface area of 0.2 m2/g or more.