Paper-Based 3D Printing via Screw Extrusion
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Solution Overview
Problem
The growing market of polymer-based additive manufacturing generates significant plastic waste, particularly from test-prints and misprints, which are difficult to recycle, necessitating specialized industrial recycling plants and laborious disposal processes.
Innovation Solution
A process for additive manufacturing of paper-based three-dimensional objects using an extrudable fibrous cellulose material deposited layer by layer with a screw extruder and nozzle, where the fibrous cellulose material contains cellulose fibers and a binding agent embedded in a matrix fluid, allowing for efficient and precise tool-free processing, and is computer-implemented for fully automated production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymer-based materials are used in additive manufacturing, then high-performance products can be manufactured, but plastic waste is generated which is difficult to recycle
Solution Approach 1:
The patent changes the material parameter from polymer-based to paper-based extrudable material. The paper-based material is processed into an extrudable form with specific viscosity and fiber composition, allowing it to be deposited layer by layer. This parameter change enables the material to maintain structural integrity while being fully biodegradable and recyclable, solving the contradiction between product performance and waste recyclability.
Solution Approach 2:
The patent uses composite paper-based materials consisting of cellulose fibers combined with binding agents and matrix fluids. This composite structure provides the necessary mechanical strength for 3D printing while maintaining the environmental benefits of paper materials. The composite nature allows the material to achieve both functional performance and sustainability.
2Loss of substance
If paper-based materials are used in additive manufacturing, then sustainable and recyclable alternatives are provided, but manufacturing precision and material deposition control become challenging
Solution Approach 1:
The patent adjusts the rheological parameters of the paper-based material by controlling the matrix fluid viscosity and fiber distribution. The material is formulated to have optimal flow characteristics for extrusion, ensuring precise deposition control. By adjusting these parameters, the system achieves both sustainability and manufacturing precision.
Solution Approach 2:
The patent introduces a matrix fluid as an intermediary carrier for the cellulose fibers. This matrix fluid facilitates controlled deposition by regulating the flow and placement of fibers during extrusion. The matrix fluid acts as a mediator between the extruder and the substrate, enabling precise layer formation while maintaining the biodegradable nature of the material.
3Productivity
If a screw extruder is used to deposit fibrous cellulose material, then efficient material conveying is achieved, but the system complexity increases
Solution Approach 1:
The patent employs a screw extruder that serves multiple functions: it conveys the paper-based material, mixes the fibers with binding agents and matrix fluid, and controls the extrusion flow. This multi-functionality achieves efficient material handling while limiting the increase in system complexity to a single well-integrated component rather than multiple separate systems.
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 provides a sustainable alternative to plastic materials by utilizing renewable or recycled paper-based materials, which are cost-effective and easily recyclable, reducing waste and eliminating the need for hot plastic melts, thus offering a more environmentally friendly and efficient manufacturing method.
Implementation Method 1
a fibrous cellulose material is deposited in a precise and reliable manner. The process provides, for example, for a screw extruder conveying the fibrous cellulose material to a nozzle through which the fibrous cellulose material is deposited on the substrate.
Implementation Method 2
the nozzle being movable in the x-y plane for the deposition of the fibrous cellulose material
Data Source
Figure 1
AI summary
The invention relates to a process and apparatus for additive manufacturing of paper-based three-dimensional objects. The process of the invention comprises the steps of a) Depositing, on a substrate (3), a layer of an extrudable fibrous cellulose material at predefined positions in an x-y plane, the fibrous cellulose material comprising cellulose fibers and at least one binding agent embedded in a matrix fluid, wherein the extrudable fibrous cellulose material is deposited by means of a nozzle (6) fluidly and flexibly connected to the outlet (42) of a screw extruder (4), the screw extruder (4) being arranged fixedly outside the x-y plane and, in a z-direction perpendicular to the x-y plane, spaced apart from the x-y plane, and the nozzle (6) being movable in the x-y plane for the deposition of the fibrous cellulose material, b) Moving the substrate (3) with the layer deposited in step a) in a predefined increment in the z-direction, and c) Repeating steps a) and b) until the three-dimensional object is manufactured, wherein the process is computer-implemented.