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???? ???? ??????? ????? ?????? ??????? ???????? ???? ???????? ?????? ????? ?????? (HPMC) ????? ??????? ????? ??????? ??? ???? ???? ?? ????? ????????. HPMC ?? ???? ?????? ??? ?????? ???? ??????? ?? ?????? ????? ?????? ????? ?????? ???????? ??????. ??????? ????? ?? ???? ??????? ??? ???? ??????? ????????? ????????? ????? ???????? ????? ?????? ??? ???????? ??????? ???????? ???????? ??????? ???????. ??? ??????? ???? HPMC ??? ???? ???? ?? ?????? ??????? ???????? ????????? ???????? ????? ??????? ??? ??????? ???? ???????? ?????????. ???? ???????? ?????? ?? ????? ?? ?????? ?? ??? ?????????. ????? ???? ??????? ????? ?????? ??????? ???????? ?????? ?????? HPMC ????? ??????? ????? ???? ?????? ???????? ???????. ???? ???? ??????? ????? ?? ??? ????? HPMC ????? ??? ???????? ??????????? ???????? ???????? ?????? ?????? ???????? ??? ??? ???? ?? ???? ????? ?? ????????? ?????? ????? ????????? ??? ???? ???? ?? Zhejiang Haishen New Materials Co.? Ltd. ??? ??????? ?????? ?????? ?? ?????? ?????? ????? ????? ??????