Two-Component Cosmetic Applicator Injection Molding

The patent combines multiple manufacturing operations (holding portion production, applicator portion production, and assembly) into a single two-component injection molding process. This merging eliminates the need for multiple manufacturers and assembly steps while maintaining the ability to select different materials for each component through the injection molding process's material injection capabilities.

The patent utilizes the phase transition of plastic materials during injection molding (from molten state to solidified state) to create a seamless, germ-free structure. The high-temperature molten plastic phase eliminates microorganisms, and the rapid cooling phase locks in a smooth surface topology that minimizes microbial hiding spots while maintaining the required surface area for cosmetic distribution.

The patent extracts and eliminates the adhesive drying step from the production process by using two-component injection molding. The applicator portion is directly molded onto the holding portion through plastic material injection and bonding, completely removing the flocking and adhesive application steps that cause production delays in traditional methods.

The patent performs the sterilization action preliminarily during the injection molding process itself. The high temperature of the molten plastic material (typically 150-250°C depending on the polymer) during injection inherently sterilizes the applicator components before they cool and solidify, eliminating the need for separate post-production sterilization steps.

The patent manages manufacturing precision requirements by optimizing injection molding parameters such as injection pressure, temperature, and cooling rate. By carefully controlling these parameters, the process achieves both the germ-free benefit of high-temperature processing and the dimensional accuracy required for functional applicator performance, resolving the apparent contradiction between sterilization and precision.