Cellulose-Fiber Polyethylene Composite Recycling via Melt Kneading
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Solution Overview
Problem
Current recycling methods for cellulose-fiber adhesion polyethylene thin films from laminated paper struggle with achieving uniform dispersion of cellulose fibers in polyethylene resin, leading to non-uniform material properties, high water absorption, and limited recyclability, which hinders the production of high-strength resin products.
Innovation Solution
The method involves melt kneading the cellulose-fiber adhesion polyethylene thin film pieces in the presence of water to integrate cellulose fibers uniformly into polyethylene resin, reducing moisture content and enhancing dispersibility, thereby producing a composite material with improved mechanical properties and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If cellulose-fiber adhesion polyethylene thin film pieces are separated from laminated paper using a pulper, then the polyethylene thin film can be recovered, but the cellulose fibers nonuniformly adhere to the polyethylene surface and absorb large amounts of water, requiring extensive drying treatment that consumes large quantities of energy
Solution Approach 1:
The invention extracts and removes cellulose fibers from the polyethylene thin film surface through filtration and washing steps, separating the adhered cellulose particles from the polyethylene material. This extraction process eliminates the need for extensive drying by removing the water-absorbing cellulose components before the drying stage.
Solution Approach 2:
The invention performs preliminary washing and filtration actions before the drying step to remove cellulose fibers and reduce moisture content. By conducting these preparatory treatments beforehand, the subsequent drying process requires significantly less energy while still achieving the desired moisture reduction.
2Ease of manufacture
If cellulose-fiber adhesion polyethylene thin film pieces are directly landfilled or recycled as fuel, then disposal is simple, but environmental load increases and recyclability as resin material is lost
Solution Approach 1:
The invention changes the physical and chemical parameters of the polyethylene thin film by controlling the washing, filtration, and drying conditions to produce a clean, dry resin material suitable for recycling. By adjusting these process parameters, the material transforms from a contaminated, moisture-laden state to a recyclable state, enabling environmental-friendly reuse.
Solution Approach 2:
The invention recovers the polyethylene thin film from the laminated paper waste stream by separating it from cellulose fibers and other contaminants. Instead of discarding the material as waste or fuel, the recovery process produces clean polyethylene resin that can be reused for manufacturing new products, reducing environmental impact.
3Device complexity
If nonuniformly adhered cellulose fibers are not removed before recycling, then processing steps are reduced, but the raw material cannot be kneaded to obtain resin with homogeneous composition and physical properties
Solution Approach 1:
The invention introduces water as an intermediary medium to facilitate the separation of cellulose fibers from polyethylene thin film. The washing and filtration steps use water to dissolve and remove cellulose particles, acting as a mediator between the contaminated thin film and the clean resin product. This intermediary process ensures homogeneous resin composition without excessive processing complexity.
4Strength
If cellulose fibers are uniformly dispersed into polyethylene resin through melt kneading in the presence of water, then physical properties such as flexural strength and impact resistance are improved, but moisture content must be carefully controlled to prevent water absorption
Solution Approach 1:
The invention maintains continuous control over moisture content throughout the processing sequence, from washing through drying to final storage. By ensuring continuous removal of excess moisture and preventing reabsorption, the material achieves uniform cellulose dispersion and enhanced mechanical properties without developing water absorption problems in the final product.
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
This approach results in a cellulose-fiber dispersion polyethylene resin composite with enhanced flexural strength, impact resistance, and reduced water absorption, facilitating efficient recycling and utilization of previously difficult-to-recycle materials.
Implementation Method 1
a production method for a cellulose fiber dispersion polyethylene resin composite material, comprising obtaining a composite material formed by dispersing a cellulose fiber into a polyethylene resin by melt kneading at least a cellulose fiber adhesion polyethylene thin film piece
Implementation Method 2
cellulose fibers are uniformly dispersed in polyethylene resin
Implementation Method 3
melt kneading the cellulose-fiber adhesion polyethylene thin film pieces in the presence of water to integrate cellulose fibers uniformly into polyethylene resin, reducing moisture content and enhancing dispersibility
Implementation Method 4
reduced water absorption
Data Source
AI summary
A cellulose fiber dispersion polyethylene resin composite material formed by dispersing a cellulose fiber into a polyethylene resin, in which a proportion of the above-described cellulose fiber is 1 part by mass or more and 70 parts by mass or less in a total content of 100 parts by mass of the polyethylene resin and the cellulose fiber, and the polyethylene resin satisfies a relationship: 1.7>half-width (Log(MH/ML))>1.0 in a molecular weight pattern obtained by gel permeation chromatography measurement, and a formed body and a pellet using the same, a production method therefor, and a recycling method for the cellulose fiber adhesion polyethylene thin film piece.