塑料的颗粒化过程是塑料回收商常见的询问。回收塑料的主要步骤是破碎、清洗和颗粒化。今天我们将介绍这些步骤以供参考。

颗粒化前的清洗和粉碎

对于受污染的型材、废弃农膜和袋子,应先进行粗洗,以去除沙子、石块和金属等异物,防止它们损坏破碎机。粗洗后,将废旧塑料制品离心脱水,然后送入塑料破碎机进行破碎。

破碎后,在冲洗槽中进一步清洗,以去除嵌入其中的碎屑。如果废塑料含有油污,可将其浸泡在适量的碱水或温和的洗涤液中,然后搅拌,使废塑料相互摩擦和碰撞,以去除污垢。之后,为确保再生颗粒的质量,清洁后的塑料片应由专业的干燥机进行干燥。

Plastic crusher and washing machine
塑料破碎机和洗涤机

塑料的颗粒化过程

干净的塑料通过输送带被送入塑料造粒机,这就是塑料的正式造粒工艺。机器的螺杆将塑料推入加热区,在那里塑料在高温下熔化,然后通过模头挤出。长条状的塑料进入冷却水槽进行冷却和定型,最后由切粒机将条状塑料切成颗粒。

塑料造粒机
塑料颗粒机

Shuliy Machinery 提供多种加热方式的塑料颗粒机,包括电磁加热、加热线圈加热和陶瓷加热。

Scrap plastics are different from new resins in terms of performance, which is due to the fact that they have been subjected to the thermal and shear courses of the molding process, and have experienced the effects of heat, oxygen, light, climate and various media during use.

Therefore, the mechanical properties of the recycled materials, including tensile strength and impact properties, are lower than those of the original resins, and cracking causes changes in the surface structure, and the appearance quality is much worse than before, with yellowing color and reduced transparency.

通过混合新材料或添加特定的稳定剂和添加剂,例如抗氧化剂和热稳定剂,可以改善废塑料的性能,这些添加剂可以减少在废塑料造粒过程中热和氧气的负面影响。