Question 1

What is the output quality from a woven bag washing line?

Accepted Answer

A well-configured woven bag washing line should produce PP flake or pellets with contamination below 500 ppm for standard applications (woven bag re-manufacture, pipe compounding) and below 200 ppm for more demanding applications. Cement dust is particularly challenging to remove completely — if cement-contaminated bags are a significant part of your input stream, specify additional washing intensity (extra friction washer stage, hot water rinse) and confirm achievable contamination levels in the supplier's process guarantee.

Question 2

Can the same washing line handle both woven bags and flexible film?

Accepted Answer

Some manufacturers offer multipurpose lines designed to handle both woven bags (PP raffia) and flexible film (LDPE/LLDPE). In practice, the two materials have sufficiently different processing requirements that purpose-designed separate lines generally give better results. If a multipurpose line is planned, confirm with the supplier the output quality achievable for each material type and any changeover time or settings adjustment required when switching between materials.

Question 3

Where can I source woven bag washing machines?

Accepted Answer

Chinese manufacturers specialising in plastic recycling machinery are the primary source for woven bag washing machines globally. Manufacturers based in Zhangjiagang, Changzhou, and Qingdao in China produce washing lines specifically for PP woven bags and raffia. European manufacturers such as Herbold (Germany) and Previero (Italy) produce equivalent equipment at a higher price point. Request a process test with samples of your actual input material — the contamination type and level vary significantly and affects machine performance.

Question 4

What pre-sorting is needed before a woven bag washing line?

Accepted Answer

The minimum pre-sorting for a woven bag washing line is removal of non-PP materials — HDPE liners, paper labels, metal wire closures, and any non-plastic contamination. Manual sorting or magnetic separation (for metal removal) is typically the first stage before shredding. For cement bag recycling specifically, emptying and shaking out loose cement before the shredder significantly reduces the washing load and improves output quality. The more pre-sorting done at the input stage, the better the washing line performance.

Proveedores de máquinas de lavado de sacos tejidos

Processing woven PP bags — the washing sequence

Key design considerations for woven bag washing machines