Compression Roller Air Cooling to Prevent 3D Print Adhesion
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Solution Overview
Problem
The adhesion of thermoplastic materials, such as PPS, to metal components in additive manufacturing processes due to high processing temperatures, disrupts the printing process and requires additional machining to achieve the final size and shape.
Innovation Solution
A compression roller with small, shallow holes on its surface and air cooling mechanisms to reduce heat absorption and maintain a thin air layer as an insulator, preventing direct contact between the roller and heated material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compression roller is used to flatten and fuse layers of thermoplastic material, then manufacturing precision and layer fusion are improved, but heat adhesion between the roller and material causes process disruption
Solution Approach 1:
A Teflon® coating is applied to the compression roller surface to act as an intermediary layer between the roller and thermoplastic material. This coating has low friction and non-stick properties that prevent adhesion while allowing the roller to effectively compress and fuse layers together, resolving the contradiction between achieving good layer fusion and avoiding heat adhesion.
Solution Approach 2:
The surface properties of the compression roller are changed by applying a Teflon® coating, which alters the thermal and friction characteristics of the roller surface. This parameter change allows the roller to maintain contact with hot material without adhering to it, enabling continuous operation at required processing temperatures.
2Adaptability or versatility
If high processing temperatures are used to melt thermoplastic material, then material flowability and layer fusion are improved, but adhesion to metal components increases disrupting the process
Solution Approach 1:
The Teflon® coating on the compression roller serves as a mediator that allows high temperatures to be maintained for material flowability while preventing direct adhesion between the molten thermoplastic and metal roller surface. The coating withstands the thermal conditions while providing non-stick properties.
Solution Approach 2:
The Teflon® coating can be applied as a replaceable layer on the compression roller. When the coating degrades or becomes contaminated over time, it can be removed and reapplied, allowing the expensive metal roller to be preserved while using a relatively inexpensive consumable coating to solve the adhesion problem.
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 solution effectively reduces heat transfer from the deposited material to the roller, minimizing adhesion and allowing continuous printing without interruptions, thus enhancing the efficiency of additive manufacturing processes.
Implementation Method 1
The compression roller may be smooth and/or solid. The flattening process may aid in fusing a new layer of the flowable material to the previously deposited layer of the flowable material.
Implementation Method 2
One such process, commonly referred to as Fused Deposition Modeling (FDM), or Fused Layer Modeling (FLM), comprises melting a thin layer of thermoplastic material and applying this material in layers to produce a final part.
Implementation Method 3
Friction from the rotating screw, combined with heat from the barrel, may soften the plastic
Implementation Method 4
maintain a thin air layer as an insulator, preventing direct contact between the roller and heated material
Data Source
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AI summary
Embodiments of the present disclosure are drawn to an additive manufacturing system, which includes a nozzle (51) having an inlet for receiving a flowable material and an outlet for depositing the flowable material. An applicator head (43) surrounds at least a portion of a proximal region of the nozzle. The applicator head may include a housing, a cooling inlet for receiving a coolant into the housing, a cooling outlet configured to allow the coolant to exit the housing, and an air inlet. A roller (59) is mounted on the applicator head to one side of the outlet of the nozzle. The roller may include an air outlet, wherein a flow path connects the air inlet and the air outlet so that air enters the air inlet and exits the air outlet. The roller includes a plurality of holes located on an external surface of the roller.