Dongguan Longwangda Technology Co., Ltd. is located in Dongguan City, Guangdong Province, China, which is known as the world's manufacturing center. It is a professional technology company integrating R&D, production and sales of heat and moisture exchanger filter materials. The company has independent intellectual property rights and independent import and export rights. It is a private technology enterprise and a contract and trustworthy enterprise assessed by the Dongguan Science and Technology Bureau. The company's products are developed and perfected around medical heat and moisture exchangers. The existing products include single and double-layer corrugated wetted paper, type single-layer wetted paper, bacterial filter membrane, and special water-absorbent raw pulp paper. The raw materials used in the products are all wood pulp and cotton pulp imported from Canada, the United States and Russia. The company has one large laminating machine, two slitting machines, three cutting machines, and a complete packaging production line. At present, the corrugated laminating capacity is 150 tons/month, and the slitting capacity is 5 million meters/month. It is an authoritative special wet paper manufacturer in Guangdong Province. The company's production lines strictly follow the standards of Eisai to purchase, process and repackage raw materials, and use 10% of the annual profit as the company's follow-up product research and development expenses, and continue to innovate new products. The company adheres to the tenet of people-oriented, technological innovation, sincere service and customer first. According to the different needs of users, we will continue to innovate thinking, integrate technical strength, and launch and sell more and better filter products to serve our customers.