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The core of the resin; carbon chains that will make up the solid parts. Photoinitiator Molecules that react when exposed to UV light, initiating the reaction.
Additives Visual and functional supplements, such as pigments or dyes. Anisotropy Due to the layer-by-layer nature of 3D printing technologies, in many cases material properties vary to some degree according to the direction in the material in which they are measured, a condition referred to as anisotropy.
For example, a 3D printed object may have different elongation at break or stiffness in the X, Y, and Z directions. During the SLA 3D printing process, the components of the resin form covalent bonds. This provides high degrees of lateral strength, but the polymerization reaction is not driven to completion.
As the next layer is cured, the polymerization reaction includes the groups on the previous layer, forming covalent bonds not just laterally, but also with the previous layer. This means that on a molecular level, there is little to no difference between the Z-axis and the XY plane in terms of chemical bonds.
Each continuous part printed on an SLA machine is isotropic. Each continuous part printed on an SLA machine is a continuous polymer network. Isotropy has both mechanical and optical benefits. The chemical bonding process and the lack of visible layer lines inside the parts allows for printing of optically clear parts.
Learn more about isotropyand see test results of SLA 3D printed parts. Post-Curing Once printing is completed, the parts remain on the build platform in the aforementioned green state.
SLA prints in a UV-curing station. UV post-curing finalizes the polymerization process and stabilizes the mechanical properties.
Adding a post-cure chamber to the printing process finalizes the polymerization process and stabilizes the mechanical properties. This enables parts to reach the highest possible strength and become more stable, which is particularly important for functional resins for engineering, dentistry, and jewelry.
For example, successful burnout of Castable prints requires post-curing, and Flexible parts double their strength with post-curing.
Read more about the science of post-curinghow it influences mechanical properties, and post-curing hardware in our in-depth guide.
Thermoplastics Photopolymer resins are thermosetting plastics, as opposed to thermoplastics. Though they sound similar, their properties and applications can differ significantly. The primary physical difference is that thermoplastics can be melted into a liquid state and cooled multiple times to form various shapes, whereas thermoset plastics remain in a permanent solid state after curing.
Polymers in thermoset plastics cross-link together during the curing process to form an irreversible chemical bond. For the most common thermoset polymers, curing is induced by heat or suitable radiation, often under high pressure, whereas for stereolithography, the initiator is light and a photoinitiator.
Thermoplastics pellets soften and become fluid when heated, and the process is completely reversible, as no chemical bonding takes place. SLA Materials by Application Stereolithography materials are generally formulated for specific applications or industries.
Due to machine and process characteristics, proprietary materials tend to be limited to use in specific SLA systems. Standard Interchangeable lens camera, produced entirely using Standard resins, including the optically transparent lenses.
Standard resins provide high resolution, fine features, and a smooth surface finish right out of the printer. Engineering Parts printed with Engineering resins, including thermoforming and injection molds, flexible shoe sole, and consumer products.
Engineering resins simulate a range of injection-molded plastics, helping engineers and product designers conceptualize, prototype, test, and manufacture final products.During this time, he has seen many changes to the industry including significant tightening of regulations and challenges of globalization.
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