3D Printer Cooling Surface for Protective Sheet Separation
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Solution Overview
Problem
Existing three-dimensional printing technologies face challenges in preventing warping and distortion of models due to thermal shrinkage and adhesion issues between the protective sheet and heat-treated material, which disrupts the building process and affects the quality of the printed parts.
Innovation Solution
A three-dimensional printer mechanism that includes a cooling surface to separate the protective sheet from the material bed, maintaining a temperature profile that reduces thermal shrinkage and adhesion, allowing for the deposition of new layers without warping, using a temperature regulating element and a recoater with a compressor to compact and preheat the material, and a print head for thermal energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a temperature regulating element maintains the temperature of the material bed to reduce thermal shrinkage and warping, then the model stability is improved, but the heat-treated material becomes tacky and adheres to the protective sheet causing separation issues and potential warping
Solution Approach 1:
The temperature regulation is segmented into two distinct zones: a temperature regulating element that maintains overall bed temperature to prevent warping, and a cooling surface that creates a localized cool zone at the separation point. This segmentation allows the material to be warm enough for stability but cool enough at the critical separation point to prevent adhesion to the protective sheet.
Solution Approach 2:
The cooling surface provides localized cooling precisely where the protective sheet separates from the material bed. This local quality change ensures that only the separation region has reduced temperature to prevent tackiness and adhesion, while the rest of the material bed maintains elevated temperature for model stability and reduced thermal shrinkage.
2Productivity
If the protective sheet is separated from the material bed to allow new layer deposition, then the printing process continues, but heat-treated material may warp or follow the protective sheet due to tackiness
Solution Approach 1:
The cooling surface performs preliminary cooling of the material bed surface before the protective sheet separation occurs. This preliminary action reduces the temperature and tackiness of the heat-treated material in advance, preventing it from following the protective sheet during separation and ensuring accurate layer deposition without warping.
3Reliability
If a cooling surface is introduced to prevent adhesion during separation, then separation quality is improved, but the device complexity increases
Solution Approach 1:
The cooling surface is merged with the separator component, combining the separation function and cooling function into a single integrated element. This merging reduces device complexity by eliminating the need for separate cooling systems while maintaining reliable separation through localized cooling at the separation point.
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 warping and distortion by ensuring non-stick properties of the printed material, allowing for a wider range of build materials and improved mechanical stability of the printed parts, while maintaining efficient heat treatment and temperature control.
Implementation Method 1
the separator has a cooling surface in thermal communication with the uppermost layer of deposited material, the cooling surface being at a lower temperature than the temperature of the temperature regulating element
Implementation Method 2
a temperature regulating element in thermal communication with the material bed to control the temperature of an uppermost layer of deposited material
Implementation Method 3
a print head arranged to transfer thermal energy by conduction to the layer of flowable green material on the material bed
Data Source
AI summary
A three-dimensional printer (100) having a means for cooling (124) the uppermost surface of a material bed in a region immediately before a deposited layer of material (e.g. powder) at the uppermost surface is separated from a protective sheet (116). The protective sheet (116) provides a physical barrier between the deposited layer of material and a thermal print head (114) during printing. The separation of the protective sheet from the material bed may occur to create a distribution gap for a new layer of powder to be deposited (118). The cooling means may facilitate separation of the protective sheet from the deposited layer, and especially from the portion of that layer that has been heat-treated in the preceding printing pass. The cooling means may be an actively cooled surface on a separator that formed part of the print head.