| 摘要 |
Disclosed is a process for producing a three layers co-extrusion biaxially oriented polypropylene (hereinafter as BOPP) synthetic paper and transparent film for in-mold label. More particularly, the invention relates to a process for producing a three layers biaxially oriented PP synthetic paper by means of three layers co-extrusion wherein three different PP resin compositions are separately extruded by one primary and two secondary extruders first, and then are co-flowed by a same T-die to form a three layers coating sheet. Thus, the three layers structure of said three layers co-extrusion coating sheet can be made into resin layer/foamed intermediate or resin layer/resin layer, and then through cooling, biaxial orientation, corona treatment and winding to form a three layers co-extrusion synthetic paper of haze paper sheet layer/foamed intermediate layer/adhesive layer, gloss paper sheet layer/foamed intermediate layer/adhesive layer, or a three layers co-extrusion synthetic transparent film of resin layer/resin layer/adhesive layer
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