Extrusion Asia Edition 1-2020

RSFgenius过滤系统, 因为带有在线反冲功能, 可以将使用高 比例的回收料从而产生的质量和产量的限制得到最小化. 高除杂功能的多螺杆MRS 挤出机在塑料包装的生产中可直接 使用PCR 当消费后回收料和工业废品在加工过程中,回收塑料中包 含有化学添加剂比如干燥剂, 稳定剂, 乙醛净化剂, 油剂, 溶剂 等等. 对于用于和食物或皮肤接触的回收材料,根据FDA, EF- SA或其他当地的食品监控机构对纯度的要求规定, 所有的有 机或无机的潜在的有毒物质必须要被清除, 因此必须要通过排 气阶段的高除杂去污功能来得以实现. 10年以来,格诺斯MRS多螺杆挤出机已经在高污染回收 加工材料方面得到广泛的应用, 比如消费后回收料, 聚酯工业 废丝和废膜等废料, 还有聚苯乙烯, 尼龙和其他的亲水高聚物. MRS多螺杆挤出机的设计基础是单螺杆挤出机理念加上 特殊设计的多螺杆排气段部分: • 由于多螺杆段含有环绕着主螺杆旋转的8根行星单螺杆从 而将排气的面积增加了无数倍 • 真空度仅仅为25-30mBar • 高效去除挥发杂质, 油剂和异味 • 高聚物加工的水份含量可高达1% • 有效加工100%回收料和瓶片料到食品级制品并得到FDA 的无异议证明以及EFSA和数个当地的批准. MRS 多螺杆回收技术是模块化的设计所以很容易的集成 到现有生产线上.通过替换单个的结构组成元件或整合上格诺 斯加工单元, (包括有旋转过滤器, 带有真空系统的多螺杆挤出 机再加上控制系统组成)现有生产加工可被改造成适合于回收 料的加工生产线. 包装废料回收的系统性解决方案 格诺斯提供交钥匙生产线将回收料和各种各样的废料加 工成热塑性片材和粒子: 其中有个非常成功的领域就是使用格诺斯MRS多螺杆挤 出机加工PET片材. 最近几年来已有超过30条以上格诺斯定制 的生产线在全球被安装并顺利投入运行. 可以同时加工原生料 和回料料并被应用在食品级包装行业已得到众多客户的认可: • 不需要预干燥和预结晶 • 可加工各种原生料和回收料或混合料比如PET, PE和 PETG • 多年的在食品包装行业的加工经验比如食品级和非食品级 透明片材, 气泡包装, 热塑性食品托盘等. • 在发泡薄膜生产中灵活的转换可以将物理发泡密度减低 50%以上. P roduction processes that were previously designed only for the processing of virgin material and thus achieved consis- tently high quality under known conditions, are now severely disturbed or interrupted at higher recycling rates by contamina- tion and strongly fluctuating material qualities. High quality re- quirements can often no longer be realised with the existing production lines. In addition, the demand for the increased use of recycled mate- rials in plastic products requires sufficient and regular availabili- ty of these. As a consequence, the focus is increasingly shifting to raw material sources that were previously not in focus. Gneuss extrusion technologies and system solutions for highest standards in packaging recycling Retrofitting existing lines with Gneuss extrusion technologies For the processing of recycled materials, an investment in new production facilities is not absolutely necessary – Gneuss is an expert in the recycling of plastics and offers innovative techno- logies and system solutions for retrofitting. With the replace- ment of individual key components within the extrusion line, decisive key elements are supplied which make the existing line fit for the recycling cycle. The focus here is on cleaning the plas- tic melts: • Gneuss Rotary Melt Filtration Systems for an efficient and economic filtration of plastic melts • Gneuss MRS Extruders for highly-efficient degassing and de- contamination of plastic melts for direct food contact 图2: MRS多螺杆挤出机的多螺杆部分 Picture 2: Multi screw section of Gneuss MRS Extruder 32 回收利用 Extrusion Asia Edition 1/2020