Wet Web Composite Intermediate for Natural Fiber Plastic Adhesion
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Solution Overview
Problem
The manufacture of wood composite products faces issues such as thermal stress on fibers, fiber breaking, reagglomeration, and weakened mechanical properties due to strong hydrogen bonds between cellulose fibers, as well as undesirable odors and limited color options, particularly with lignin or hemicellulose-containing products, and lower production capacity compared to pure plastic products.
Innovation Solution
A web-type composite intermediate is formed through wet web formation using a homogeneous liquid mixture of natural fibers, small plastic particles, and a compatibility-improving agent, which prevents excessive hydrogen bonding between fibers, enhancing adhesion and mechanical properties, and allowing for the use of lignin-free fibers for odor-free and colored products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If dry wood or natural fiber material is melt-mixed with plastic at high temperature, then the plastic materials are in molten state for mixing, but the dry wood and natural fiber materials form strong hydrogen bonds that cannot be opened, resulting in low effect of compatibilizing agents and strong tendency to reagglomerate
Solution Approach 1:
The invention changes the physical state parameter of the mixture from dry to wet (aqueous suspension), which fundamentally alters the hydrogen bonding behavior. In the wet state, water competes for hydrogen bonding sites, preventing strong fiber-fiber bonds while allowing compatibilizing agents to effectively bond fibers to plastic particles. This parameter change resolves the contradiction by enabling effective compatibilization without requiring extreme temperatures that would damage fibers.
Solution Approach 2:
The invention introduces an aqueous suspension as an intermediary medium that facilitates uniform distribution of compatibilizing agents between natural fibers and plastic particles. The water-based medium allows compatibilizing agents to act as effective intermediaries, forming bonds between the hydrophilic fiber surfaces and hydrophobic plastic particles without the fibers strongly bonding to each other through direct hydrogen bonding.
2Strength
If strong hydrogen bonds are formed between cellulose fibers to strengthen the cellulose network, then the cellulose network is strengthened, but reagglomeration of cellulose fibers occurs in further processes, causing fiber bundles that weaken the mechanical properties of the end product
Solution Approach 1:
The invention applies preliminary action by forming the composite material in a wet state where hydrogen bonds are controlled, before drying occurs. The compatibilizing agents are introduced in the wet suspension stage to prevent excessive fiber-fiber bonding before the network is established. This preliminary compatibilization ensures that when the material is subsequently dried and processed, fibers remain well-distributed and bonded to plastic particles rather than reagglomerating into weak fiber bundles.
3Adaptability or versatility
If lignin or hemicellulose-containing products are manufactured, then natural fiber-based composite products are produced, but undesirable odor and limited color options occur
Solution Approach 1:
The invention applies the taking out principle by selectively removing lignin and hemicellulose components from the natural fiber composition. By using delignified or bleached fibers, the harmful odor and color limitations associated with these components are eliminated, while the beneficial cellulose fiber structure and bonding capabilities are retained. This selective extraction resolves the contradiction by removing only the problematic components.
4Manufacturing precision
If wet web formation is used to manufacture composite material, then homogeneous distribution of compatibilizing agents and plastic particles is achieved, but liquid removal and drying processes are required
Solution Approach 1:
The invention applies continuity of useful action by integrating the wet web formation process with continuous drying and processing steps. The aqueous suspension is formed continuously with uniform distribution of components, then passed through continuous drying zones that efficiently remove water without interrupting the production flow. This continuous process maintains the homogeneity benefits of wet formation while maximizing productivity through uninterrupted processing.
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 provides composite products with improved mechanical strength, resistance to weathering, and reduced reagglomeration, enabling the production of strong, lightweight, and environmentally friendly end products with enhanced processing capabilities and color options.
Implementation Method 1
The composite intermediate is formed by wet web formation from a substantially homogeneous liquid mixture which contains natural fibers, plastic particles having a diameter of less than approximately 1000 μm, and an agent that improves compatibility between natural fibers and plastic particles. Liquid is removed from the web formed in connection with wet web formation.
Implementation Method 2
the dry wood and natural fiber materials, when dry, are strongly hydrogen bonded, and these bonds cannot be opened in the process. The homogeneous compatibilization of the web, i.e. the improved compatibility between natural fibers and plastic, prevents formation of hydrogen bonds in excessive amounts between natural fibers
Data Source
AI summary
A web-type composite intermediate is formed from fibers and plastic. The composite intermediate is formed by wet web formation from a substantially homogeneous liquid mixture which contains natural fibers, plastic particles having a diameter of less than approximately 1000 μm, and an agent that improves compatibility between natural fibers and plastic particles. In addition, a method for forming a composite intermediate and the use of the composite intermediate are also described.