http://pastport.jp/user/heshun-petfilm ja-JP Our company has obtained over more 30 patents covering the research and development of raw material formulas, the renovation of key equipment, and the design and optimization of process parameters. We own a professional polyester film factory. 2023-08-17T15:33:31+0900 http://pastport.jp/user/heshun-petfilm/timeline/heshun-petfilm heshun-petfilm http://pastport.jp/user/heshun-petfilm/timeline/heshun-petfilm