What are the characteristics of the L-shaped section of the makeup brush?
What are the characteristics of the L-shaped section of the makeup brush? The bristles of the grinding brush of the makeup brush can also be completed without changing the overall shape of the brush. Grinding the ends that produce tears on the bristles, giving them the shape of a bifurcation, which is equivalent to a right-angled dihedron passing through a plane that is inclined relative to the edge of the dihedron.
It should be noted that bristle bristles with L-shaped cross-section can be mixed with bristles of greater hardness.
During the grinding operation, the bristles with an L-shaped cross section wear less than hard bristles, so after grinding, the ends of the bristles with an L-shaped cross section are located outside the ends of the harder bristles. The harder bristles may be cylindrical bristles with round cross-sections or straight bristles or horseshoe-shaped bristles.
The makeup brush can be exposed to a heat source, such as an infrared radiation matrix, which causes the L-shaped section to expand, and the expansion extends along the entire transverse interface of the bristles.
The bristles of an L-shaped cross-section makeup brush can be mixed with the bristles of a smaller cross-section and exposed to the heat source. During heat treatment, the bristles of the smaller cross-section have poor heat resistance, and the length shortening is much greater than that of the bristles with the L-shaped cross-section, so that the expanded ends of the bristles of the L-shaped cross-section remain protruding out of the outer ends of the bristles of the smaller cross-section.
The bristles of an L-shaped makeup brush can be mixed with the bristles with a straight cross-section, especially with a substantially rectangular cross-section with a larger size, whose size is equal to double the smaller size and not larger than the smaller size 5 times the bristle blend.
The bristles of an L-shaped cross-section makeup brush are preferably extruded through a suitable mold. These bristles can be made from polyamide plastic or from PA11 (trade name KILSAN), or from polyethylene, from thermoplastic elastomers such as polyurethane.
A brush made of bristles with an L-shaped cross-section makeup brush may contain a small number of bristles per ring, for example, 7 to 40 bristles per ring.
The branch wire used for the core, especially the iron wire, can be very thin, preferably with a diameter of 0.5 to 1 mm, and the bristles of the inherent L-shaped cross section are squashed in the ring.