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Second-generation light-curing 3D printing technology

Release time:

2025-01-10 17:04

Second-generation light-curing 3D printing technology

Digital Light Processing, or DLP for short, emerged more than a decade after the advent of SLA (Stereolithography) technology. It is a variant of SLA and shares a similar principle with SLA’s forming technology. This technology is also widely recognized in the industry as the second-generation photopolymerization-based additive manufacturing technique.

DLP light-curing 3D printing technology utilizes a high-resolution DLP projector to project ultraviolet light onto a printing platform containing photosensitive resin. Based on a computer-generated 3D model, the resin is cured layer by layer, with each layer being superimposed on the previous one, ultimately constructing a physical model. Compared to traditional SLA technology, DLP technology can cure an entire layer of resin in a single exposure, significantly boosting printing speed and efficiency.

The DLP device features a resin tank that can hold liquid photopolymer resin, which solidifies when exposed to ultraviolet light of a specific wavelength. The DLP imaging system is positioned beneath the resin tank, with its imaging surface precisely aligned at the bottom of the tank. By precisely controlling energy and image patterns, the system can solidify a thin layer of resin of a specified thickness and shape in each exposure cycle. Above the resin tank, a printing platform is installed. After each cross-sectional exposure is completed, the platform rises by a predetermined height, separating the newly solidified resin from the tank’s bottom surface and allowing it to adhere either to the printing platform or to the previously formed resin layer. In this way, by sequentially exposing and elevating layers, a three-dimensional object is gradually built up.

DLP light-curing 3D printing technology has the following characteristics:

1. High Precision and Detailed Reproduction: DLP technology enables precise printing of extremely fine features, making it particularly well-suited for creating complex structures and intricate textures.

2. Fast printing speed: Since the entire layer is exposed at once, the printing time is significantly shortened compared to technologies that cure point by point or line by line.

3. Diversified Materials: With technological advancements, DLP printers now support an increasingly wide range of resin materials, including transparent, flexible, high-temperature resistant, and bio-based types, among others.

4. Excellent surface quality: The interlayer bonding in the light-cured layer is tight, resulting in a smooth finished surface that requires relatively simple post-processing.

Precision is the greatest advantage of DLP light-curing 3D printing. To ensure high precision, the projection size is limited, allowing only small-sized models to be printed.

Thanks to its unique technological advantages, DLP photopolymerization 3D printing is gradually reshaping the landscape of traditional manufacturing, driving new trends in personalized customization, rapid prototyping, and the production of complex structural components. As the technology continues to mature and breakthroughs are made in materials science, the application boundaries of DLP photopolymerization 3D printing will keep expanding, bringing unprecedented innovation opportunities and manufacturing possibilities to various industries. This technology is poised to become one of the key drivers behind the intelligent and personalized evolution of manufacturing.

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