Introduction of the L-shaped cross-section of the makeup brush

Today, our makeup brush set will introduce an L-shaped cross-section of a brush for applying makeup products. Grinding the bristles 9 of the brush can also be done without changing the overall shape of the brush 4. Grinding the torn ends on the bristles 9 gives it the shape of a bifurcation 15 (Figure 7). The bifurcation is equivalent to a right-angled dihedron passing through a plane that is inclined with respect to the edge of the dihedron. It should be pointed out that the bristles 9 with an L-shaped cross section can be mixed with the bristles of greater hardness. During the grinding operation, the bristles 9 with the L-shaped cross section wear less than the hard bristles, so after grinding, the ends of the bristles 9 with the L-shaped cross section are located outside the ends of the harder bristles. The harder bristles can be cylindrical bristles with a circular cross-section or straight cross-section bristles or bristles with a horseshoe-shaped cross-section. As shown in FIG. 8, the brush 4 can be exposed to the heat source 16, for example, the infrared radiation matrix is u200bu200bthen seen in FIG. The bristles 9 having an L-shaped cross-section can be mixed with the bristles of a smaller cross-section, and then exposed to the heat source 16. During the heat treatment process, the bristles with a smaller cross-section have poor heat resistance, and their length shortening is much greater than that of the bristles with an L-shaped cross-section, so that the expanded ends 17 of the bristles with the L-shaped cross-section remain protruding from the ends of the bristles with a smaller cross-section. . The bristles with an L-shaped cross-section can be mixed with the bristles with a straight cross-section, especially with a substantially rectangular cross-section with a larger size, such as FR-B-2,627,363, whose size is equal to double The bristles of the smaller size and not more than 5 times the smaller size are mixed. The bristles with an L-shaped cross-section are preferably obtained by extrusion through a suitable die. These bristles can be made of polyamide plastic PA6-66, 6-10; 6-12 or PA11 (commercial name KILSAN), or made of polyethylene, made of thermoplastic elastomer such as polyurethane. According to the present invention, a brush made of bristles having an L-shaped cross-section may contain a small number of bristles per ring, for example, 7 to 40 bristles per ring. The metal wires of the branch wires 7 and 8 used to make the core, especially the iron wires, can be very thin, preferably 0.5 to 1 mm in diameter, and the bristles of the inherent L-shaped cross-section are squashed in the ring.
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