BOPP membrane

The utility model discloses a BOPP membrane, top layer under upper epidermis, sandwich layer reach, its characterized in that the surface on top layer is covered and is had an extinction layer down, and this extinction layer thickness is even, upper epidermis, sandwich layer, lower top layer and extinction layer four layers be crowded integrated into one piece altogether. The utility model discloses increase one deck extinction layer on the basis that original three -layer was crowded altogether, realize that the four layers is crowded altogether to the extinction layer's that increases thickness is even, extinction layer's the limit portion and the thickness equalling at middle part promptly, limit portion, the middle part homoenergetic of so guaranteeing the membrane reach the extinction standard. 本实用新型公开了种BOPP膜，包括有上表层、芯层及下表层，其特征在于所述下表层的表面覆有消光层，且该消光层厚度均匀，所述上表层、芯层、下表层及消光层四层共挤体成型。本实用新型在原有三层共挤的基础上增加层消光层，实现四层共挤，并且增加的消光层的厚度均匀，即消光层的边部和中部的厚度均等，如此保证膜的边部、中部均能达到消光标准。