Abstract��
�� new AC type membrane��coated unit was prepared. The coating solution composition and the number of layers of the membrane were changed to prepare different kinds of AC type controlled release unit, then controlled release experiments were carried out and theoretical analysis was made. It is proved that AC type membrane��coated unit has a good controlled release character and its controlled release character may be adjusted by the content of ARW in the coating solution and the number of membrane layers.����
1998, Vol. 15 
