Shanghai Daoqin Plastics Co., Ltd.

         film production field/area in, “ blow molding method ” and “流延 method ” is relatively is commonly used types process, lower this types film production in most commonly used production process simple introduction and comparison.

         more 层共挤 blow molding method

         this type of production process methods main/primary separation is upper cold and lower water cold types 形式.

         upper cold

         main/primary is more extrusion machine, more add 模头, more 风口风 ring, IBC inner cold system, 人字夹 sheet/plate, 旋转牵引 system, lower system and system this several main/primary separation formed. currently, Imported machine 组以原 Germany 巴登菲尔德, Germany W&H, add large is 主, Domestic machine in 以广东金明 is table/sheet. upper analysis, currently core machine can force 依然由国 outer company control, 如广东金明 machine large separation core parts still need outer production supply.

         lower water cold

         basic parts and upper same, different is in cooling methods, lower 吹以循 ring water as is cooling main/primary 形式, parts design and upper has different, this type of production process in PE and PP film production in comparison Common. in more 层共挤 high retardant property film production in, still above cold machine is 主. tube/pipe use types machine 组, in appearance upper, is 以筒状 film is main/primary performance 特征, in true bag made bag 方面, due to decrease/reduce hot 封边, in for packaging inner material upper ratio film has non large advantages. in tensile strength ratio film good.

         more 层共挤流延 method

         this type of production process main/primary is more extrusion machine, more runner separation device (俗称“集 material device ”), T type 模头, system, water 平牵引 system, device, system formed.

         this type of production process main/primary features in 于, production film products surface gloss degree good, degree high, thick degree small, force 学延伸 property can good, flexibility property good, transparent degree ratio blow molding method high. currently Imported machine 组以原 Germany 巴登菲尔德, Germany W&H, Italy 科林斯, 奥 利兰精 company, Mitsubishi heavy is table/sheet, Domestic machine 组以佛山仕诚 is table/sheet. 同样, Domestic machine production methods and blow molding 一样, main/primary core parts 自于国 outer supply 商. currently types production process main applications in inner CPP industry, in 七层共挤 high retardant property production in has a small amount of application.

         Imported production in main/primary 以广东 in 山祥富 七层 and 十一层 machine and 常州海企塑业 九层 machine is table/sheet.

         this types production process in is most is Common, due to blow molding process in product degree and transparent degree 方面不 can and film versus ratio, is its production high efficiency, equipment low, low material loss consumption amount is process method ratio 拟.

         therefore, in outer enterprise for blow molding process 不足之处 改进 upper, in-depth research and development, main/primary in (1)模头 design 改进, using/adopting 独特 平行 more runner design 理念;(2) for extrusion machine 放置 位置 and degree upper;(3)泠却 system 改进(以风 ring and inner cold technology is 主)(4)材 material formulation and structure design this 四 方面. through 实践证明, in film transparent degree, degree, 各层材 material thick thin uniform degree upper to or 接近流延 method water 平. if inner enterprise in high retardant film equipment 投入方面, 2010 year rear basic film is 主.

         blow molding method and method comparison

         blow molding method and method is polyolefin film production processing types main/primary production process methods. blow molding method relatively used for film production processing, its production process property and product method defect, 二十世纪八十 year 代, types more is film production processing 工――流延 method development 起, especially is using/adopting more 层共挤 technology, make method film production processing process large scope/range and application, its high quality product features 逐步应 used for various material product high packaging in, blow molding method due to its solid has defect, can meet/satisfy 于普通 in, low product packaging.

        一, production process comparison

        1, method ratio blow molding method more add combined used for more 层共挤 film production processing, especially use multiple different 材质 材 material 进行共挤时, method production process parameters more easy control, processing equipment key/critical separation ――模头 design more can has ensure product in various material distribution uniform property. blow molding method more 层共挤模头 technology difficult degree more large, structure more is complex technology 尚不够 formed 熟.

        2, method processing equipment in, 模头至 cold 辊(molding type) generally is 10～20mm, film very short in true gas 罩, gas and plant/unit lower very fast type, product quality good stability. blow molding method due to film has 一 吹胀 process, 并依靠空 gas or water cooling type. product type time long type front very large (generally 吹胀4～7倍). easy in film stage/phase to outer and factors effect/influence, product quality control difficult degree non large stability property 差.

        3, in raw materials selection upper blow molding method and method has relatively large 差异, more 层共挤时 blow molding method requirements amount selection flow property 接近 材 material versus 互搭配, material flow property versus relatively large 时, versus measures adjustment, 因而当选定 its in types material 时, and its other material has more large selection 余, this in very in degree upper made more 层共挤 processing process advantages in product quality upper 体现, 而流延 method processing equipment through for separation runner adjustment can very light solution blow molding method in 几乎无 method solution issues.

        二, product features comparison

        1, blow molding method has 一 吹胀 process 而导致 product 纵, toward separation to different degree tensile. product resistant temperature degree property can and hot property can 都会受 to relatively large effect/influence, product need 蒸煮消毒(如121℃蒸 gas)时, molding in by tensile separation 子链受 hot rear has obvious shrink phenomenon, product heavy deformation, and large large reduce hot 封连接处 strong/high degree 而导致漏 bag phenomenon.

        2, method production film (also tensile film)时, separation 子排列 has 序, product cooling speed degree fast, has improve/increase product transparent degree, gloss degree and thick thin uniform property, product relatively soft, relatively tough; impact resistant property can, heat resistant and low temperature property good blow molding method.

        3, method production efficiency high, product quality stability property good. production process in waste material less, relatively easy achieve in recycling 边, waste material, material utilizing rate high.

        4, method using/adopting 平模头, inner has 特殊滞留槽, can ensure material flow uniform 一致, and through 模头 自动 adjustment plant/unit can control 模唇间隙 uniform property, control degree non high, relatively thick film can control in ±3% below/following. blow molding method using/adopting ring 形模头 and more add 模芯, for processing degree and assembly degree requirements non high especially difficult control, if processing and combined degree has micro small 误差, method through adjustment 弥补, therefore product thick thin basic in ±10% left right, for/regarding 200μm thick film 而言也就意味 most thin is 180μm而 most thick can can is 220μm, in made bag 时, mold and hot temperature degree how to adjustment difficult ensure most thick and most thin can to must combined strong/high degree. bag phenomenon in difficult 免, formed product rate very low.

        5, for/regarding melt strong/high degree relatively low material, using/adopting lower method, water cold type. water dry 不彻底 or electrical 晕层选 material 不当都会导致 electrical 晕处理效果差 or electrical decrease heavy. effect/influence printing ink bonding degree 而导致脱 color. method using/adopting made sheet/slice 辊(inner cooling water) for film cooling type, water separation and film 直接接触.

        6, for/regarding 需蒸煮(121℃蒸 gas 杀菌) film, 无论流延 method also is blow molding method must selection resistant grade Raw Materials. non grade material rear 会导致 film hard, and generate whitening phenomenon. effect/influence film appearance also 会导致 bag resistant impact property and resistant pressure heavy decline, method to testing standards and use requirements.

        7, in plastics molding processing process in, due to hot separation understanding or low separation 子淅出 material easy in 口模处 generate material 堆积. method can very easy remove blow molding method film inner material can machine remove. and remove easy belt/tape in film in, formed inner material in content ultra- 标 or in film surface generate obvious 划痕. due to blow molding method output/production volume low, 开车浪费 large, frequency 繁开, mono production cost large degree upper rise.

        三, investment use comparison

        1, due to blow molding method one-time property investment less, 厂房占 面积 small, equipment 便宜, investment small fast (equipment processing cycle short, debugging short, equipment and less, requirements low). 而流延 method equipment, and one-time property investment non large, is blow molding method 5至10倍. currently blow molding method application relatively method more more.

        2, due to blow molding method process conditions made product quality 差, output/production volume small, mono production cost high, 虽经不断改进 and 完善, still difficult 以取代流延 method. this is currently food packaging film in film output/production volume high blow molding film most causes.