Separation Membrane Fluid Injection Additive Manufacturing

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Solution Overview

Problem

In additive manufacturing using digital light processing, the separation of cured resin layers from the build window can cause deformation and poor dimensional accuracy due to high separation forces.

Innovation Solution

The system employs a replaceable separation membrane laminated over the build window and a pressure regulation system to inject fluid into the interstitial region between the separation membrane and the build window, reducing adhesion forces and distributing separation forces evenly across the resin layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If direct separation of cured resin from build window is performed, then build window is cleared for next layer, but high separation forces cause deformation and poor dimensional accuracy

Engineering Contradiction:

Improvebuild window clearance efficiencyVSAvoiddimensional accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

A separation membrane is introduced as an intermediary layer between the build window and the cured resin. This membrane facilitates easier separation by reducing adhesion forces, allowing the resin to be released without high separation forces that would cause deformation. The membrane acts as a sacrificial interface that protects both the build window and the resin part.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Fluid pressure is applied to the separation membrane to facilitate its separation from the cured resin layer. By using pneumatic or hydraulic pressure, the membrane can be peeled away with controlled, distributed forces rather than concentrated mechanical forces, thereby avoiding deformation of the resin part while enabling efficient clearance of the build window.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Ease of operation

If high separation forces are applied to separate resin from build window, then separation is achieved, but peak forces cause deformation and build failure

Engineering Contradiction:

Improveseparation easeVSAvoidbuild failure risk

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The separation membrane serves as a mediator that reduces the adhesion strength between the resin and build window. This intermediary layer allows separation to occur with lower forces, distributing the separation stress across the membrane-resin interface rather than directly at the resin-build window interface, thereby reducing peak forces and build failure risk.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The separation membrane is implemented as a thin, flexible film that can conform to the resin surface and be peeled away with minimal force. The flexibility of the membrane allows it to bend and separate from the cured resin without requiring high mechanical forces, reducing the risk of deformation and build failure.

Inventive Principle:

Principle #30Flexible shells and thin films

3Manufacturing precision

If separation membrane is used to reduce adhesion forces, then deformation risk is reduced, but system complexity increases

Engineering Contradiction:

Improvedeformation controlVSAvoidsystem component count

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The separation membrane is a simple intermediary component that can be easily laminated to the build window and removed after use. Despite adding a component, the membrane is straightforward to implement and replace, and it significantly reduces deformation risk by controlling the separation interface. The simplicity of the membrane design and its easy replacement procedure minimize the actual complexity increase.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 minimizes peak forces on the resin layer, reduces the risk of deformation and build failure, and allows for the use of resins with lower green strengths, while maintaining high accuracy and repeatability in the build process.

Implementation Method 1

a pressure regulation system to inject fluid into the interstitial region between the separation membrane and the build window

Methodology Applied

Scientific EffectFluid pressure: Pressure Increase

Implementation Method 2

evacuating the fluid from the interstitial region to peel the separation membrane from the first layer of the build

Methodology Applied

Scientific EffectEvacuation: Depressurisation

Implementation Method 3

digital light process in the field of additive manufacturing

Methodology Applied

Scientific EffectPhotocuring: Photopolymerisation

Data Source

PatentUS20250153426A1Method for build separation from a curing interface in an additive manufacturing process

Publication Date: 2025.05.15 STRATASYS INC

AI summary

A layer-by layer method for additive manufacturing that includes: photocuring a first volume of resin to form a layer of a build at an upper surface of a separation membrane laminated over a build window; injecting a fluid into an interstitial region between the separation membrane and the build window; retracting the build from the build window; evacuating the fluid from the interstitial region; and photocuring a second volume of liquid resin to form a subsequent layer of the build between an upper surface of a separation membrane and the previous layer of the build.