Fiber-Starch Dry Molding for Smooth, Strong Paper Products
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Solution Overview
Problem
Existing papermaking methods require large amounts of water, energy, and resources, leading to environmental challenges and difficulty in achieving both excellent surface touch feeling and strength in molded products like paper.
Innovation Solution
A method involving deposition, humidification, and molding of a fiber and starch mixture, where the starch has a specific gelatinized and pulverized particle diameter of 0.30 mm to 1.0 mm, using a dry process to create molded products with enhanced surface touch feeling and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the papermaking method is used to manufacture molded products, then the surface touch feeling can be improved, but a large amount of water and energy is required, and the facility size increases
Solution Approach 1:
The invention changes the physical and chemical parameters of the binding material by using gelatinized starch instead of traditional binders. The starch is gelatinized at specific temperatures (90-110°C) to achieve optimal binding properties, replacing the need for large amounts of water in the papermaking process. This parameter change enables the formation of high-quality molded products with excellent surface touch feeling while significantly reducing water consumption.
Solution Approach 2:
The invention utilizes the phase transition of starch from dry powder to gelatinized state during heating. The starch undergoes phase change at specific temperature ranges, transforming its properties to provide binding strength. This phase transition mechanism allows the starch to function as an effective binder without requiring the large amounts of water needed in conventional papermaking methods, thus resolving the contradiction between surface quality and water consumption.
2Shape
If the papermaking method is used to manufacture molded products, then the surface touch feeling can be improved, but energy consumption and facility requirements increase
Solution Approach 1:
The invention optimizes the temperature parameters during the molding process to achieve gelatinization of starch at 90-110°C, which is more energy-efficient compared to the high-temperature drying and energy-intensive facility requirements of conventional papermaking. By controlling the temperature parameter within this specific range, the process achieves excellent surface touch feeling while reducing overall energy consumption.
3Quantity of substance
If conventional molding methods are used, then water consumption is reduced, but the surface touch feeling and strength of the molded product deteriorate
Solution Approach 1:
The invention changes the binding mechanism by using gelatinized starch that provides strong binding forces. The starch, when gelatinized at controlled temperatures, creates robust bonds between fibers, achieving molded product strength comparable to or exceeding conventional methods while using minimal water. This parameter change in the binding material's physical state resolves the contradiction between low water consumption and high product strength.
Solution Approach 2:
The invention employs a composite system where gelatinized starch acts as the binding matrix holding fiber particles together. This composite structure of starch-bound fibers creates a strong, cohesive molded product. The gelatinized starch forms a continuous binding phase that integrates individual fibers into a unified structure, achieving high strength without requiring large amounts of water, thus resolving the contradiction between water reduction and strength maintenance.
4Quantity of substance
If conventional molding methods are used, then water consumption is reduced, but the surface touch feeling deteriorates
Solution Approach 1:
The invention optimizes the temperature and time parameters during gelatinization to control the morphology and distribution of starch particles on the molded product surface. By controlling these parameters, the surface achieves excellent smoothness and touch feeling. The gelatinized starch forms a uniform, fine-grained surface structure that feels pleasant to the touch, while the process uses minimal water, thus resolving the contradiction between low water consumption and high surface quality.
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 achieves molded products with improved surface smoothness and strength using minimal water, reducing energy consumption and facility size, while allowing for efficient recycling and environmental sustainability.
Implementation Method 1
the starch has a gelatinized and then pulverized particle diameter d50 of 0.30 mm or more and 1.0 mm or less
Implementation Method 2
a humidification step of applying water to the mixture
Implementation Method 3
a molding step of heating and pressurizing the mixture applied with water to obtain a molded product
Data Source
AI summary
A method for manufacturing a molded product of the present disclosure includes a deposition step of depositing a mixture including a fiber and starch in air, a humidification step of applying water to the mixture, and a molding step of heating and pressurizing the mixture applied with water to obtain a molded product. The starch has a gelatinized and then pulverized particle diameter d50 of 0.30 mm or more and 1.0 mm or less, which is the average particle diameter of the finely pulverized product determined by a prescribed measuring method.