Extrusion Asia Edition 2-2021

22 信息縱覽 Extrusion Asia Edition 2/2021 体、低聚物和水等挥发性成分在输送到 加工段之前就已被可靠地去除并分流, 然后在合适的分离器中排出。 Innovative Process for Bottle-to-Bottle Recycling n Polyethylene terephthalate (PET) is a high-value material that is on course to take over a key function in the plastics industry’s path toward a circular econo- my. PET flakes can now be processed without pre-drying into pellets using Coperion ZSK twin screw extruders. Next they are condensed in the SSP (Solid State Polycondensation) reactor, and re- processed back into bottles again with the quality of virgin material. PET recyclate manufactured using this in- novative process has received approval from the United States Food and Drug Administration (FDA) for food-contact uses. Thanks to the highly efficient plasti- fication within the ZSK extruder, Coperi- on systems for this bottle-to-bottle recy- cling process achieve throughput rates between 2 and 8 tons per hour, there- fore recycling companies profit from very high product quality, reduced operating and logistic expenses as well as from energy cost savings up to 30% in com- n 聚对苯二甲酸乙二醇酯 (PET) 是一 种高价值材料,有望在塑料行业走向循 环经济的道路上发挥关键作用。现在, 可以使用科倍隆 ZSK 双螺杆挤出机将 PET 薄片加工成粒子,而无需预先干 燥。接下来,它们在 SSP(固态缩聚) 反应器中冷凝,获得与纯新材料相同的 质量,并再次重新加工成瓶子。 使用这种创新工艺制造的 PET 回 收料已获得美国食品和药物管理局 (FDA) 的批准,可用于接触食品的用 途。由于 ZSK 挤出机具有高效的塑化 能力,用于这种从瓶到瓶回收工艺的科 倍隆系统具备了每小时 2 至 8 吨的产出 量,由于有着非常高的产品质量,且运 营和物流费用得到降低,塑料回收再生 公司可以从中获益。与传统的 PET 回 收方法相比,能源成本节省高达 30%。 由于当今使用大量PET作为包装材 料,所以这种材料 在回收利用方面发挥 着越来越重要的作用。PET 是一种非常 有价值的材料,具有非常好的再加工特 性。所以在一次性和可重复使用的瓶子 方面的应用不断扩大。同时,通过储存 收集系统进行回收,增加了它的价值。 相应地,公司专注于 PET 回收可能是 有利可图的。 在 PET 进行再加工之前,必须先 将其切碎成薄片,然后进行清洗。普通 技术需要在洗涤后对 PET 瓶片进行预 干燥、结晶或附聚。但是,使用科倍隆 的专业技术,可以将切碎的 PET 直接 送入 ZSK 双螺杆挤出机并进行混合。 使用“科倍隆-开创”的高精度 SWB(智 能称重皮带)喂料机或称重式喂料机, 可将切碎的瓶片可靠地送入 ZSK 挤出 机。此外,还可以添加其他回收料、新 材料或混合料。在熔体通过齿轮泵和带 有自动换网器的过滤器输送到用于生产 粒子的拉条造粒机或水下造粒机之前, 先要在 ZSK 挤出机的加工段进行熔 化、强力脱除挥发成分并完全均质化。 然后,熔体在 SSP固态缩聚反应 器中冷凝成球团。粒子足以达到纯新原 料的质量要求。 通过将 PET回收料直 接加工成瓶子,回收商将特别受益于极 高的终端产品质量。从瓶到瓶的加工过 程中,加工过程非常温和。物料在 ZSK 挤出机中的停留时间非常短,分散性非 常好。 ZSK 挤出机具有高扭矩特性, 能够在低温下进行加工,物料几乎没有 粘度损失。 ZSK 挤出机的自清洁功能可以快 速变更配方和颜色。ZSK 双螺杆挤出机 具有非常好的脱除挥发成分的选项,单 从瓶子到瓶子回收再生的创新工艺 parison to conventional PET recycling methods. PET plays an ever more important role in recycling, due to the large volume of packaging materials in use today. PET is a very high-value material, possessing ex- tremely good properties for reproces- sing. Its continuously expanding use in single- and reusable bottles, as well as its recovery via deposit systems, add to its value. Correspondingly, it can be lucra- tive for companies to focus on PET recy- cling. Before PET can be reprocessed, it must first be shredded to flakes and then cleaned. Ordinary technologies require pre-drying, crystallization or agglomera- tion of the PET flakes following washing. However, using the specialized technolo- gy from Coperion, the shredded PET can be fed directly into the ZSK twin screw extruder and compounded. The shredded flakes are reliably fed into the ZSK extruder using high-accuracy SWB (Smart Weigh Belt) feeders or gravi- metric feeders from Coperion K-Tron. In addition, other regrind materials, new materials, or mixtures can be added. Melting, intensive devolatilization, and complete homogenization take place in the ZSK process section before the melt is transferred via a gear pump and filter 回收再生系统用于经济地将 PET 瓶片加工成用于制造瓶子的PET 粒子。典型配置: 1) SWB(智能称重皮带)喂料器; 2) ZSK双螺杆挤出机; 3)添加PET瓶片; 4) 挥发 性成分的脱除; 5) 通过齿轮泵和过滤器输送; 6) 水浴; 7) 拉条干燥; 8) 拉条造粒 (图片:科倍隆) Typical set-up of a recycling system for economically processing PET flakes into PET pellets that can be used in turn to manufacture bottles: 1) SWB (Smart Weigh Belt) feeder; 2) ZSK twin screw extruder; 3) Addition of PET flakes; 4) Devolatiliza- tion of volatile components; 5) Discharge via gear pump and filter; 6) Water bath; 7) Strand drying; 8) Strand pelletizing (Image: Coperion) 科倍隆新颖的从瓶到瓶回收再生技术 / Coperions innovatives Bottle-to-Bottle Recycling 1 2 3 4 5 6 7 8

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