The natural texture of cherry blossom petals is composed of the arrangement of epidermal cells, the distribution of veins and microscopic folds, and its touch combines the smoothness of silk with the transparency of gossamer. OULI® has achieved a three-dimensional reproduction of the physical properties of real petals in simulated cherry blossom products through bionic material engineering and nanoscale surface treatment technology.
Microstructure reverse engineering
The OULI® R&D team used an electron microscope to scan the surface of over 500 fresh cherry blossoms and established a three-dimensional texture model containing 32,000 data points. By analyzing the rhombic arrangement pattern of the epidermal cells of petals (side length 0.15-0.22mm) and the branching Angle of the leaf veins (17-23°), a programmable micro-engraving mold was developed. This mold replicates cell protrusions and vein depressions with a precision of 0.01mm, enabling the surface of the simulated petals to form a topological structure with an error of less than 8% compared to real cherry blossoms.
Multilayer composite material system
The product adopts a five-layer gradient structure.
Base material layer: High-elastic polyester fiber provides tear resistance strength (up to 12N/mm)
Flexible layer: A silicone mixture enables 270° bending without rebound
Texture layer: Thermoplastic polyurethane (TPU) forms 0.03mm-level wrinkles through laser etching
Light-transmitting layer: The nano-titanium dioxide coating makes the refractive index of light approach that of real petals (1.48-1.52).
Protective layer: Fluorocarbon resin enhances UV resistance (QUV test 500-hour color difference ΔE<1.5)
Dynamic touch simulation system
OULI® innovatively applies the principle of non-Newtonian fluids to address the deformation response of petals when touched. Microcapsule phase change materials are embedded in the TPU layer. When subjected to a pressure of 0.1-2N, the viscosity of the material instantly drops by 60%, simulating the soft touch of real petals. The initial hardness is restored within 0.3 seconds after the pressure disappears. This technology keeps the error between the fingertip friction coefficient (μ=0.12) of the simulated petals and that of real cherry blossoms (μ=0.15) within 20%.
Optical texture synchronization technology
Aluminum oxide films were deposited in the light-transmitting layer through magnetron sputtering technology to form an interference structure with a thickness of only 80nm. This coating can cause the incident light to undergo a diffraction deflection of 15-25°, precisely reproducing the unique semi-transparent texture of cherry blossoms. Measured data shows that the light transmittance of OULI® simulated petals under D65 light source (38%) is highly close to that of early-blooming cherry blossoms (41%), and they present a similar pinkish-white gradient effect as the observation Angle changes.
Enhanced environmental adaptability
The material system is equipped with an intelligent adjustment mechanism for different temperature and humidity scenarios.
Low-temperature environment (-10℃) : The molecular chain activity of TPU is enhanced, maintaining flexibility
High-temperature environment (45℃) : The expansion coefficient of the silicone layer is reduced by 32%, preventing deformation
In a humid environment (RH90%) : The surface energy of fluorocarbon resin drops to 22mN/m, achieving a self-cleaning effect
The accelerated aging test conducted by OULI® Laboratory shows that after continuous use for three years, the texture clarity retention rate of its simulated cherry blossom products reaches 92%, and the softness of the touch does not decline by more than 15%, significantly outperformance the industry average (65% clarity retention rate). This breakthrough technology has obtained the EU CE certification and the CNAS laboratory accreditation of China, providing a new generation of solutions for the fields of high-end floral decoration, film and television props, and biological teaching models.
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