Shanghai Daoqin Plastics Co., Ltd.

近段 time, small to very more electrical 话, inquiry PP raw materials issues, machine positive 常, production 出 熔喷布, to testing machine testing to 95 standards, is what 会达不 to 95 standards 呢? small to large understanding 惑!

熔喷布看起 并没 what especially, production process separation complex, its made as process/workflow can is large step/link: from in 提炼石脑油, rear chemical processing formed polypropylene (PP), most rear 经熔喷 process formed material, this main/primary introduction most rear step/link.

polypropylene (PP) （PP）容 easy formed filament, in melt flow index relatively high （MFI≥1500g/10min） 情况 lower, can formed is versus fine fiber （直径 is 2~3 μm）. although production 熔喷布空隙 versus relatively new type 冠状病毒 dimensions （0.1 μm left right ）而言 large more, is its for/regarding ring in 病毒 滤 can force very strong/high.

因 is, 病毒无 method 独立存 in, its 传播途径 main/primary has separation material and 打喷嚏时 飞沫, large small in 5 μm left right; 熔喷布 essence upper is types fiber device, has 病毒 飞沫靠近熔喷布 rear, by electrical in surface, method 透.

熔喷 process filament 孔直径远 small inner outer viscous in use filament 孔, is is 熔喷布 fiber 直径仅 is viscous fiber separation 之一. is to fine degree, remove more small filament outer, also need in filament extrusion meanwhile make melt fiber to high speed hot gas 流 牵伸, in addition room temperature gas mixed hot gas, can make by fine melt cooling solid formed 形.

经牵伸 and cooling solid ultra- fine fiber in gas function lower toward 凝网帘, 凝网帘 lower has true 空抽吸 plant/unit, can will fiber in 凝网帘 upper, utilizing 自身余 hot combined formed 网.

most rear, is important is 驻极处理, filament upper electrical can make molding fiber belt/tape has 持久 静 electrical 荷, from make 熔喷布 in retardant 碍呼吸 front lower outer tool has electrical 吸附效应. 熔喷 method production 无纺布自身 tool 备35% 滤 property can, 经 驻极处理 rear property can improve/increase 至95%.

熔喷布 as is most retardant 隔层, is types is fine 密 材质, internal many 纵横交错 ultra- fine fiber machine direction 堆叠而 formed. 以PP is 例, MFI越 high, processing 时拉出 filament fine, property can good.

hot gas 喷射角 degree main/primary effect/influence tensile and fiber 形态. degree small make fine formed fiber 束, from 而导致无纺布 uniform property 差. degree 趋于90°, will generate high degree dispersion 而湍动 gas 流, has fiber in 凝网帘 upper random distribution, most to 熔喷布各 toward property property can good.

in temperature degree 恒定 情况 lower, screw extrusion speed rate maintain in scope/range: in certain 一临界点之 front, extrusion speed degree fast, 熔喷布定 amount high, strong/high degree large; to ultra- 该临界 value, 熔喷布 strong/high degree decline, especially is MFI＞1000时 more is obvious, can can is is extrusion speed rate high filament strip/profile 牵伸不充 separation, filament heavy, from 而布面 adhesion fiber decrease/reduce, 熔喷布 strong/high degree reduce.

in same temperature degree, screw speed and 接收距离（DCD） and other conditions lower, hot gas speed degree fast, fiber 直径越 small, 无纺布手感逐渐变 soft, fiber 缠结越 more, from 而导致纤网 more add 密实且 light slip, strong/high degree improve/increase.

long 接受距离会导致纵横 toward strong/high degree, flexural strength decline, 无纺布手感蓬松, in process in 会导致 滤 efficiency and retardant force decline.

市面 upper very more filament sheet/plate mold use material is standards material, use low mold 钢代替, use process 会出现一 眼睛看不 to fine micro 裂痕, processing 毛糙, degree 差, 不经 抛 light 处理, upper machine. formed filament non-uniform, tough property 差, filament coarse fine 不一, easy generate crystallization.