Shanghai Daoqin Plastics Co., Ltd.

        1.异 type 口模

        口模异 type is extrusion machine 头 口模 or rod local 位置开设凹槽, increase large for made parts 拐角处 口模间隙, increase type local 位置 壁 thick, to type type 坯, 弥补吹胀 ratio 不一致造 formed toward thick 不均, from to thick relatively is uniform made parts. for property using/adopting type 口模, through more mold trial, optimization, design processing combined 理 异 type 口模, can large improve/increase made parts thick distribution uniform property.

        2.轴 toward thick control technology

        轴 toward thick control technology function is make extrusion plastics type 坯, according to products different ratio toward obtain different thick degree, from ensure most products has comparison uniform thick. it is through make rod or according to 预设位置 as toward 运动而改变 machine 头 开口 amount, to plastics type thick 目. currently in formed machine material machine generally tool has toward type control function, its control from 30点 to 256点不 and other.

          3.径 toward thick control technology

         using/adopting toward thick control technology although can improvement blow molding products high degree direction upper thick distribution, due to its extrusion plastics type water 平截面 still and other thick 圆形, for separation in toward certain 一部位 has relatively large ratio requirements products still is most 佳, therefore generate toward thick control technology. toward thick control technology can make extrusion type in requirements inner non 圆截面 变化. toward thick control technology development 至今, large formed 2 types type design, types is flexible ring 式, types is 口缘修形式.

        (1) flexible ring technology

         flexible ring is through electrical liquid control thin property ring in 1 direction or 2 for direction upper deformation extrusion type thick degree. it features is 无论吹 made what products, need 口模直径不变, toward control can function. for in formed plastics type toward thick control system made as, most in obtain key/critical property technology breakthrough. this control technology can achieve plastics type toward thick more 点准确 control, control can achieve 2～16点 control more more control, currently positive in industry in.

        (2)口缘修形 technology

        口缘修形 is 靠修形口模 ring upper lower achieve type thick 改变. and property ring structure versus ratio, its most large advantages is use lifespan long, processing technology difficult degree low. in certain design in, ring 修缘部 separation formed active block 嵌入式, more 换, decrease/reduce more cost. this type of design, also need in-depth research, reduce cost, add fast 推广步伐.

        径 toward thick control technology for/regarding improve/increase large type in products quality is has methods, also can decrease light products quality. 以200L plastics container is 例, less can 节省5%～10% raw materials. currently processing sleeve/set large type toward thick control plant/unit add use relatively high, 随 径 toward thick control technology in-depth research and development, will in more more large in type extrusion blow molding in formed machine upper application.

        轴 toward thick control and toward thick control combined function, can obtain most plastics type 坯, can obtain more is products thick distribution. currently inner more in formed machine manufacturing can in large type in formed machine upper selection sleeve/set toward thick control system.

        (3) type temperature method

         type deformation resistant force can use viscosity table/sheet 示, viscosity large small and its temperature degree high low has 关. type temperature degree high, degree small, deformation resistant force small, blow molding process in easy deformation, deformation amount relatively large; versus 反, type temperature degree low, degree large, deformation resistant force large, blow molding process in easy deformation, deformation amount relatively small. in extrusion process in, through cooling equipment strong/high made cooling type 坯吹胀 comparison large 部位, make type tool has combined temperature degree degree. type 坯吹胀 comparison large temperature degree low, viscosity increase large, deformation resistant force increase large. in 自由吹胀 stage/phase, comparison large difficult deformation, deformation amount decrease small, 而吹胀 comparison small deformation amount increase large. deformation amount relatively small 部位完 formed deformation, 进入约束吹胀 stage/phase, comparison large 部位继续 deformation, 直至吹胀 formed made parts, improve/increase made parts thick distribution uniform property.

        (4) true thermoforming and extrusion blow molding versus combined

         type 坯各部位吹胀 ratio different products thick non-uniform. products process can separation is 自由吹胀 and 约束吹胀2 stage/phase. from pressure shrink gas type to type and mold inner 壁开始接触 is is 自由吹胀 stage/phase. in this stage/phase, type tool has same ratio, in direction deformation 都不受约束, can in direction deformation, relatively uniform. from type and mold type 腔开始接触 to type full and mold inner combined is 止称之 is 约束吹胀 stage/phase. in this stage/phase, type outer surface mold cooling function, temperature degree decline, viscosity increase large, deformation relatively is difficult, 甚至不 again deformation, products thick relatively large;没 has mold type 腔 坯 material, temperature degree versus for relatively high, viscosity relatively small, deformation relatively is easy, speed thin, mold inner surface, products thick relatively small, most make made parts thick non-uniform. if type meanwhile 结束自由吹胀, can to thick full uniform made parts. make type in true negative pressure force function lower, toward comparison large 部位发生 deformation, rear pressure shrink gas, improvement type 坯各处 吹胀 ratio, formed to thick relatively is uniform made parts.