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