Petronela-Daniela Rusu (Ostahie)

Surface texturing involves creating micro-channels, micro-dimples, micro-grooving, and other surface modifications. To do this, laser and micromachining are employed on the substrate surface in addition to other methods. The surface characteristics of the Arboblend V2 Nature biodegradable polymers with laser texturing, hexagonal and square patterns, and four and six passes are shown in this study. Regardless of the texture type, Arboblend V2 Nature’s hydrophilic surface (a contact angle of less than 90°) was demonstrated by the results of the wettability test. The underlying material’s wear behavior changed as a result of the LST surface modification. The COF values increased only after six passes with both textures. On the topographical side, Arboblend V2 Nature (square and hexagonal) shows a consistent X-axis expansion in the hexagonal geometry and a considerable amount of variability in the square geometry, especially at six passes, where the Y-axis (higher depths) is more compressed. According to the results, since textured surfaces are practicable, non-biodegradable polymers from a variety of industries can be substituted.

Surface texturing entails surface alteration through forming, microgrooving, microdimpling, and microchanneling. This is achieved by laser micromachining, in addition to other related methods, of a substrate surface. The present paper describes the surface characteristics obtained after the laser texturing of a biodegradable polymer (Arbofill Fichte) with four and six passes in hexagonal and square patterns. The results of the wettability test indicate that this biodegradable polymer has a surface with a weak hydrophobic characteristic (contact angle near 90°), regardless of the type of texture that is obtained. The underlying material’s wear behavior changes as a result of the surface alteration due to laser surface texturing (LST). The coefficient of friction (COF) values thus increase for all samples. The hexagonal geometry offers greater stability and consistency compared to square geometry, independent of the number of passes. Square geometry is more susceptible to variations, particularly along the Y axis, and may need additional adjustment of the process parameters. The hexagonal structure naturally promotes more uniform leveling due to its tighter and more evenly spread arrangement, even at four texturing passes (4x). However, at six texturing passes (6x), the advantages become more pronounced because of the repeated overlaps in the laser trajectories. The overlap in the hexagonal configuration guarantees that each area of the material receives a relatively consistent energy dose, reducing localized discrepancies. The possibility of using this method to texture surfaces is viable; thus, based on the obtained results, there is the possibility that it can replace non-biodegradable polymers in different sectors.

Surface texturing entails surface alteration through forming, micro grooving, micro dimpling and microchanneling. This is achieved by laser micromachining, in addition to other related methods on the substrate surface. The present paper puts forward the surface characteristics obtained after the laser texturing of the Arbofill Fichte biodegradable polymers with four and six passes, in hex-agonal and square patterns. The results of the wettability test indicated that Arbofill Fichte has a surface with a weak hydrophobic character (contact angle near 90°), regardless of the type of texture that was obtained. The underlying material's wear behaviour changed as a result of the Laser Surface Texturing (LST) surface alteration. Friction coefficient (COF) values thus increased for all samples. Arbofill Fichte exhibits a higher Y-axis stability in both geometries, suggesting a better resistance to vertical compression (subsidence), particularly in the 6 passes case. Addition-ally, Arbofill Fichte has a better X-axis extension. Therefore, Arbofill Fichte is stable and uniform in both geometries and at both numbers of passes, providing a more consistent X-axis expansion and better-managed Y-axis compression. The possibility of use in the practice of textured surfaces is viable; thus, based on the obtained results, there is even the possibility to replace non-biodegradable polymers from different sectors of activity.