3D Printing Heat-Curable Silicone Layer Curing
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Solution Overview
Problem
Conventional 3D printing methods face challenges with consistent and uniform heating and curing of layers, particularly as objects increase in thickness, due to limitations in materials and heating techniques, leading to suboptimal results in end applications.
Innovation Solution
A method involving the use of heat-curable silicone compositions, where a first layer is printed and heated to form a partially cured layer, followed by printing a second layer before the initial layer reaches full cure, with optional repetition using independently selected silicone compositions and heating methods, including conductive, electromagnetic, and exothermic heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional 3D printing methods use traditional materials and heating techniques, then the printing process can be completed, but the heating and curing of layers becomes inconsistent and non-uniform, particularly as objects increase in thickness
Solution Approach 1:
The patent segments the curing process into multiple stages by printing layers in a partially cured state and completing the cure after the entire object is printed. This allows each layer to be deposited without waiting for full cure, enabling consistent material properties during printing while achieving uniform curing throughout the final object regardless of thickness
Solution Approach 2:
The patent applies preliminary curing to layers before complete curing is achieved, allowing subsequent layers to be printed on top. This preliminary action maintains the material in a workable state during printing while ensuring that the final object achieves uniform complete curing through controlled heating after printing is finished
2Reliability
If conventional 3D printing methods use heat-curable organic polymers, then the material can be cured, but consistent and uniform heating and curing of various layers becomes challenging, particularly as the object is built with an increasing thickness
Solution Approach 1:
The patent segments the curing process into two distinct phases: a preliminary curing phase that occurs during printing to maintain layer stability, and a final curing phase that occurs after printing is complete. This segmentation ensures consistent curing throughout the object regardless of thickness by applying controlled heating conditions during and after the printing process
Solution Approach 2:
The patent changes the curing parameters by using compositions with extended pot life that allow curing to proceed slowly during printing, then applies controlled heating after printing to achieve uniform final cure. This parameter change from rapid immediate curing to controlled extended curing enables consistent results for objects of varying thickness
3Productivity
If conventional additive processes are used with limited material types, then the printing process can proceed, but the materials have limitations including slow solidification times and improper viscosity for certain applications
Solution Approach 1:
The patent changes the material parameters by using heat-curable silicone compositions with extended pot life that maintain proper viscosity during printing, then applies controlled heating to achieve rapid and uniform curing. This parameter change from room-temperature curing to heat-accelerated curing enables both fast solidification and broad material applicability for various end uses
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 enables the formation of 3D articles with improved consistency and uniformity, allowing for the creation of complex shapes and structures with enhanced durability and aesthetic appeal by maintaining partial cure states across layers.
Implementation Method 1
condensation-curable silicone compositions
Implementation Method 2
hydrosilylation-curable silicone compositions
Implementation Method 3
heating the layer to form an at least partially cured layer
Implementation Method 4
conductive heating via a substrate on which the layer is printed
Implementation Method 5
electromagnetic heating
Implementation Method 6
heating from an exothermic reaction of the particular heat-curable silicone composition
Data Source
AI summary
A method of forming a three-dimensional (3D) article comprises the steps of I) printing a first heat-curable silicone composition with a 3D printer to form a layer, II) heating the layer to form an at least partially cured layer, III) printing a second heat-curable silicone composition on the at least partially cured layer with the 3D printer to form a subsequent layer, and IV) heating the subsequent layer to form an at least partially cured subsequent layer. Optionally, steps III) and IV) can be repeated with independently selected heat-curable silicone composition(s) for any additional layer(s) to form the 3D article. The first and second heat-curable silicone compositions may be the same as or different from one another.