Patent Abstract Iolite Loose Calibrated Gemstone,Natural Blue Iolite Faceted Square Cut,Loose Faceted Iolite Natural Gemstones Guangzhou Qinfa Crafts Company , https://www.qinfastone.com
This invention relates to a method for manufacturing expanded beads. The process involves combining a base resin, which includes a polypropylene resin with a tensile modulus of at least 1,200 MPa, along with a colorant and a thermoplastic polymer that has a lower tensile modulus than the base resin. These components are thoroughly mixed to create a homogeneous kneaded mixture. Within this mixture, a matrix is formed from the base resin, while multiple domains—each containing both the thermoplastic polymer and the colorant—are dispersed throughout the matrix. Afterward, the mixture is processed into resin pellets. These pellets undergo surface modification through treatment with an organic peroxide, enhancing their ability to expand during foaming. When the modified pellets are foamed, they produce expanded beads with a distinct internal structure: an inner zone surrounded by a skin layer. Notably, the melting temperature of the surface region is lower than that of the inner core, which contributes to better control over the expansion process and improved bead quality.
Patent Sovereignty
The method for producing expanded beads includes several key steps. First, a base resin composed of polypropylene with a tensile modulus of at least 1,200 MPa is combined with a mixture of a colorant and a thermoplastic polymer. The thermoplastic polymer used in this step has a lower tensile modulus compared to the base resin. The combination is then thoroughly kneaded to form a uniform mixture. In this mixture, the base resin forms a continuous matrix, while the thermoplastic polymer and colorant are distributed as discrete domains within it. Once the mixture is ready, it is shaped into resin pellets. These pellets are then surface-modified using an organic peroxide to improve their expansion characteristics. Finally, the surface-modified pellets are subjected to foaming and expansion processes, resulting in the production of high-quality expanded beads. This method ensures better structural integrity and controlled expansion, making it suitable for various industrial applications.