Shanghai Daoqin Plastics Co., Ltd.

         in extrusion machine extrusion process in, melt material material through by to mold. make material material to 滤, can material material mixed combined 效果. is, 滤网也 can make process process generate 波动, back pressure and melt material material temperature degree upper rise, has also decrease/reduce.

         extrusion machine by solid in more or 槽 保护 sheet/plate upper, this can make extrusion machine and mold between formed 密封. dry 净 滤网 generate pressure relatively small, pressure increase, upper resin in 杂质数 amount more, from retardant 塞 滤网.

        1, 滤网会 effect/influence melt material material temperature degree

        当 more retardant 塞 滤网时, pressure 会突然 decline, melt material material temperature degree can can decline, from formed product dimensions 发生变化. is maintain product dimensions, can adjustment extrusion machine screw speed, can adjustment extrusion machine property speed degree.

         in extrusion product 时, this can can 不会导致严 heavy issues, in extrusion or outer 形不规则 product 时, melt material material temperature degree can can effect/influence product outer dimensions. ratio 如, in 一 扁平 mold 里, relatively cold melt material material can can make sheet/slice in thin, make 周边偏 thick. this type of can through for mold or adjustment to positive.

         in 滤网变换 device rear 面, 配备一 can ensure melt material material stability mold gears 泵, can anti upper issues 发生. is, melt material material in more rear temperature degree still need through for mold adjustment solution. meanwhile, due to gears easy by hard loss bad, therefore, gears need to fine 滤网 保护.

        2, how to selection 滤网

        钢 filament is extrusion machine most commonly used metal 滤网材 material. 不锈钢 although comparison 昂贵, can 避免出现生锈. alloy by used for by fluorine polymer or 者PVDC 腐蚀 场 combined.

         generally lower, 滤网筛眼(or 者说每英寸 metal filament 数目) is 20～150 or more more. 20筛眼 滤网 comparison coarse;40～60筛眼 滤网 comparison fine;80～150筛眼 滤网则 very fine.

         large more 数 滤网 筛眼都呈方格 weaving, direction metal filament same. Netherlands weaving method is in water direction using/adopting coarse metal filament, 并规定 is di 数. use Netherlands weaving method made 滤网不 need in plant/unit inner 设置并联筛网就 can to fine function.

        筛眼数目 same 滤网 孔径 is according to metal filament 直径 确定, necessary full 一致. ratio 如, 由行距 is 24in, is 0.02in metal filament formed 20筛眼 滤网, its 每侧 开孔 is 0.01in;而由行距 is 30in, is 0.01in metal filament formed 20筛眼 滤网, its 每侧 开孔稍 large, is 0.04in. this is is fine metal filament 滤不够 fine, but also more easy retardant 塞(1in=25.4mm).

        3, 滤网安装 plant/unit

         generally lower, plant/unit methods is: most coarse 糙 滤网 for sheet/plate, most fine 滤网则面 for extrusion machine.

         ratio 如, from sheet/plate to extrusion machine 滤网排列 methods can can is 20筛眼/40筛眼/60筛眼, is this type of structure can anti 止滤网 by 堵, can will 杂质“吹入”保护 sheet/plate inner.

         if most fine is 80 or more more 筛眼, is anti 止该滤网 by melt material material 旋转运动 or large retardant 塞, can will coarse 糙滤网放 to front 面(ratio 如20/100/60/20筛眼 排列). is this type of plant/unit type type from 两边看 same, therefore is ensure it 们不会 by 颠倒, has using/adopting for 称 布置 methods (20筛眼/60筛眼/100筛眼/60筛眼/20筛眼).

         has processing 商故意 will 滤网装颠倒, let coarse 滤网先 滤 upper surface relatively large pellets 杂质. 他们认 is, this type of methods can more more 侧面熔 melt material material through, make sheet/plate upper surface material material relatively less separation understanding.

        4, has 关 滤网 precautions

         due to filament 滤网容 easy 生锈, therefore in 储藏时 need 避免潮 wet, iron will 会出现 in extrusion material 里. more is heavy is, 生锈滤网 very easy fracture make 滤出 杂质漏, therefore, need will 滤网装入 plastics bag or anti in 储藏.

        吹扫, 清洁保护 sheet/plate very easy 出现反卷 phenomenon, make 密封面受 to bad, make sliding versus 匹配, from generate 泄露. this 样, 不但会造 formed 清洗工 as 费时, but also 泄露 熔 melt material material can can effect/influence hot electrical value, also loss bad add hot device, has 时甚至 can can 导致 火.

         for/regarding mono gas, grade extrusion machine 而言, if 滤网处 back pressure large, that its 第二段 output/production volume will decrease/reduce, its 第一段 output/production volume 不会受 to effect/influence. back pressure large increase 至2500lb/in2(1lb=0.4536Kg,1in=25.4mm)时, 自第一段 熔 melt material material 就开始徐徐泄露入排 gas 孔. is 避免此 type phenomenon 发生, need in pressure relatively low more 换滤网. another, plant/unit rear gears has made melt material material 泄露入排 gas function.

         if 滤网 滤 to large sheet/slice material (ratio sheet/slice), it 会突然完 full 失效, this 样就会 make extrusion machine pressure speed to value. therefore, is anti upper 述情况发生, must need has safety film, safety or and pressure table/sheet versus 连 报警 and other safety system.