Separation Membrane for Additive Manufacturing Build Window
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Solution Overview
Problem
In additive manufacturing systems using digital light processing, the separation of cured resin layers from the build window often results in high separation forces, leading to deformation of the build, increased probability of build failure, and reduced print speeds.
Innovation Solution
The system employs a replaceable separation membrane laminated over the build window during photocuring, which limits adhesion forces between the build and the window. A pressure regulation system is used to inject or evacuate gas between the separation membrane and the build window, aiding in the separation of cured layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If direct contact between cured resin layer and build window is used, then adhesion strength is improved, but separation forces increase causing build deformation
Solution Approach 1:
A separation membrane is introduced as an intermediary layer between the cured resin layer and the build window. The membrane provides a controlled interface that reduces adhesion forces during separation, preventing build deformation while maintaining sufficient adhesion during curing. The membrane acts as a mediator that decouples the conflicting requirements of strong adhesion for layer bonding and low adhesion for easy separation.
Solution Approach 2:
The separation membrane is implemented as a thin, flexible film that can conform to the build window surface and the cured layer geometry. This flexible film structure allows it to maintain close contact during curing for adequate adhesion, while its flexibility enables it to deform and release during separation without causing stress concentration or build deformation.
2Strength
If strong adhesion between resin layer and build window is maintained, then layer bonding is improved, but separation forces increase leading to build failure
Solution Approach 1:
The separation membrane serves as a mediator that differentiates between the curing phase and separation phase. During curing, the membrane provides sufficient adhesion for layer bonding; during separation, the membrane's controlled adhesion properties reduce separation forces, thereby preventing build failure. This resolves the contradiction by providing context-dependent adhesion behavior.
3Productivity
If high separation forces are applied to separate cured layers, then separation is achieved, but print speed is reduced due to increased build failure probability
Solution Approach 1:
By introducing the separation membrane as an intermediary, the system enables gentle separation with reduced forces. This allows for faster separation cycles without increasing build failure probability, thereby improving print speed while maintaining reliability. The membrane acts as a buffer that facilitates quick, low-force separation.
4Device complexity
If direct build window contact is used, then system complexity is reduced, but system wear increases
Solution Approach 1:
The separation membrane is implemented as a replaceable, consumable component that protects the permanent build window from wear. The membrane can be easily replaced when worn, while the expensive build window maintains its service life. This resolves the contradiction by sacrificing a low-cost, easily replaceable component to protect the high-value, wear-sensitive component.
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 reduces separation forces, increases build speed, minimizes system wear, and enhances repeatability across individual resin layers and builds, while allowing for a wider range of curable resin chemistries.
Implementation Method 1
an evacuation of gas, via the fluid distribution port, from an interstitial region between the base assembly and the tray assembly
Implementation Method 2
injection of gas, via the fluid distribution port, into the interstitial region
Implementation Method 3
configured to project electromagnetic radiation within the photo-initiating range toward an upper surface of the build window
Data Source
AI summary
An additive manufacturing system including a base assembly and a tray assembly. The base assembly includes a build window, substantially transparent to electromagnetic radiation; a projection system configured to project electromagnetic radiation toward an upper surface of the build window; and a tray seat arranged around a perimeter of the build window. The tray assembly is configured to engage with the base assembly in an engaged configuration and includes: a tray structure defining a registration feature configured to engage the tray seat to locate an aperture proximal to the upper surface of the build window in the engaged configuration; and a separation membrane that is configured to laminate across the upper surface of the build window in response to an evacuation of gas from an interstitial region and configured to separate from the build window in response to injection of gas into the interstitial region.