Polylaminated Cardboard Recovery via Segmented Pulping and Shredding
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Solution Overview
Problem
Current methods for recovering polylaminated cardboards often leave behind metal and polymeric components as waste, leading to significant environmental and economic impacts, as they are not effectively recovered in existing processes.
Innovation Solution
A method and plant that separates and recovers all components of polylaminated cardboards, specifically using a high-density pulper to separate cellulosic fibers from polymeric and metal layers, followed by filtration, shredding, washing, and extrusion to produce a composite material of polyolefin, aluminum, and cellulosic fibers, which can be reused in new products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current recovery methods focus on recovering a specific material (e.g., cellulosic fibers or polymers), then the recovery efficiency for that specific material is improved, but the other components become waste that requires disposal
Solution Approach 1:
The recovery process is divided into distinct sequential stages: first recovering cellulosic fibers through pulping and filtration, then recovering polymeric materials through shredding and separation, and finally managing metal components. Each stage focuses on extracting one material type while preparing the remaining mixture for the next recovery stage, thereby converting what would be waste into the feedstock for subsequent recovery processes
Solution Approach 2:
The patent systematically discards (separates and removes) each component material at its optimal recovery stage, transforming the waste problem into a multi-stage recovery opportunity. Cellulosic fibers are discarded from the laminate structure first, then polymeric materials are discarded from the remaining mixture, with each discarding action enabling the next recovery operation
2Device complexity
If a single-material recovery method is used, then the process simplicity is maintained, but environmental impact and disposal costs increase due to unrecovered components
Solution Approach 1:
The complex task of multi-material recovery is segmented into simpler sequential operations, each handling one material type. This segmentation allows the use of relatively simple, proven technologies (pulping for fibers, shredding for plastics, filtration) in sequence, rather than requiring one complex system to handle all materials simultaneously, thus managing complexity while achieving comprehensive recovery
Solution Approach 2:
The recovery process maintains continuous useful action by ensuring that the output of one recovery stage becomes the input for the next stage. The cellulosic fiber recovery process continuously feeds into the polymeric material recovery process, which in turn feeds into metal component management, creating an unbroken chain of useful actions that maximizes material recovery while maintaining operational efficiency
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 effectively recovers and reuses all components of polylaminated cardboards, minimizing waste and environmental impact by optimizing the recovery of cellulosic fibers for paper production and polymeric materials for plastic reuse, achieving a high yield of usable raw materials.
Implementation Method 1
a high-density pulper to separate cellulosic fibers from polymeric and metal layers
Data Source
AI summary
A method for the recovery of polylaminated cardboards, including the steps of: introducing the polylaminated cardboards inside a pulper, comprising a first tank, as well as with water, so as to obtain the progressive impregnation of the cellulosic fibers that make up the cardboards, and their detachment from the polymeric plastic layers of the cardboards; emptying the contents of said pulper into a second tank, configured for metering a portion of water and cellulosic fibers to be used for the paper mill production process; removing the mixture of residual materials remaining in said second tank, said mixture comprising the polymeric and metal component, still partially covered with fibers, and water; shredding said mixture, in order to reduce the size of the solid materials contained therein, and in such a way as to allow the further subsequent recovery of the residual cellulosic fibers; conveying the mixture of broken up materials, coming from said shredding step, into a third tank, wherein any residues of other foreign materials are rejected by gravity; washing the mixture of broken up materials, in order to recover more cellulosic fibers, obtaining a composite material, in the form of a by-product; squeezing said composite material, until it contains a water residue of approximately 20-25%; prepare the composite material in the form of bales, suitable for supplying the material for subsequent uses.