In 2019, Sanyou was renamed from "Dongguan Plastic Machinery Manufacturing Co., Ltd." to "Guangdong Sanyou Polymer Equipment Co., Ltd."

In 2013, Sanyou SZS high-torque co-rotating twin-screw extruder has hundreds of sets serving the market, covering a wide range of: TPE, PC, PC/ABS, PA, PPS, color masterbatch and various functional masterbatches. Served customers include Japan's Sanyang Rice Fields, Japan Technology City, Silver Jubilee Technology, etc.

In 2008, 530 units were operating safely day and night in the PVC processing field.

In 2008, Sanyou invested in Japanese processing equipment, manufactured high-torque shunt transmission gearboxes and high-precision self-cleaning threaded components in accordance with German standards, and produced the first high-torque co-rotating twin-screw extruder with a specific torque of 10, advancing to high-end extruder market.

June 3, 2007: The fourth-generation SMD series counter-rotating parallel twin-screw extruder was launched. The self-developed four-axis drive high-torque gearbox is put into the market at the same time, and the application of mechatronics makes the product more suitable for market changes and can better meet the requirements of users.

In 2005, SAN-U entered the market for only 7 years, and has already established a leading position in the industry. In May, Japan Okuma Fenghe MILLAC1000VH five-axis multi-table machining center, turning machining center, precision gear processing equipment and British RENISHAW three-coordinate testing equipment were purchased.

In 2002, SAN-U continued to grow rapidly. At this time, there were already 192 PVC processing equipments operating all over the country. Following the successful development of the high-torque reduction gearbox, the third-generation product was launched on the market. And on April 13, 2005 established a new plant.

The first generation of SAN-U products was born in 2000. Due to the rapid development of manufacturing in Guangdong, China, the processing technology of soft PVC has been continuously improved. At the same time, the second generation of products has been put on the market and achieved ideal results.

SNA-U created the SAN-U brand when the company was founded on August 3, 1999, and developed a parallel counter-rotating extruder.