Shanghai Daoqin Plastics Co., Ltd.

         plastics film molding methods has very more, its in 流延, extrusion, blow molding this types process relatively is Common. types process made film has features, from process principle, application areas 两 方面进行整理 analysis.

         process principle comparison

        流延 method formed film

         is through melt 流涎骤 cold production types tensile, non toward film. in obvious orientation structure.

         extrusion method formed film

         Common has mono toward tensile and di toward tensile method, its in di toward tensile is year is production methods. di toward tensile technology basic principle is high poly material raw materials through extrusion machine by add hot melt extrusion formed thick sheet/slice, again in 玻璃化 temperature degree above melting point below/following temperature degree scope/range inner, through tensile machine rear toward and toward 进行一定倍数 tensile, make separation in 平行于 film upper orientation has 序 排列, rear in 拉紧状态 lower hot type, make orientation large separation structure solid 定, most rear cooling and rear 续处理 formed film.

         blow molding method formed film

         usually is extrusion blow molding method manufacturing, material material extrusion, formed tube/pipe 坯吹胀 molding, again cooling, 牵引, 卷取. blow molding film is has orientation.

         from above types process molding methods different, formed film conductive property has significantly different; meanwhile tensile film and tensile film versus ratio retardant property can improve/increase, for gas and other property reduce, optical property can, transparent degree and surface gloss degree improve/increase, dimensions temperature degree property good, thick degree uniform property can good.

         application areas comparison

        以CPP, BOPP and 普通PP film is 例进行 comparison

        CPP

         product tool has transparent, soft/flexible, retardant property and machine 械适应 property good, high temperature resistance 蒸煮(蒸煮 temperature degree in 120℃ above) low temperature hot 封(hot temperature degree small 于125℃) and other features. main/primary used as food, 糖果, 土特产, food (can suitable for packaging), cold products, product, material and other composite/compounding packaging inner 层基材, can long food shelf life, increase degree. also can used for tool product table/sheet 层, 隔层, can 做辅助 film, sheet/slice and bookmark product active 页, label and other.

        BOPP

         tool has excellent printing property can, can and 纸, PET and other composite/compounding, tool has high degree and gloss degree, excellent and coating viscous force, high tensile strength, excellent retardant property can, low electrical features and other. in printing composite/compounding field/area application relatively 广, meanwhile in and other as is packaging materials.

        普通PP

        因 process simple, cost low, optical property can low 于CPP and BOPP. main/primary used for 点心, 面包, textile product, parts 夹, sheet/slice sleeve/set, 运动鞋 and other outer packaging.

         its in BOPP and CPP composite/compounding property can improve/increase, application more 广, composite/compounding rear tool has anti property, transparent property, property, can used for dry property food 如花生米, fast food, force, type and other packaging. year plastics film types type and type type increase more, and has long, technology process improve/increase, packaging film outlook/prospects vast.