Welcome to ANDA
Welcome to ANDA
A PVC recycling line is not one machine but a whole loop. Stiff cut-offs from extrusion plant are pre-crushed into granules before getting ground as powder; sieved & stored until mixing again to compound or processed further for pelletizing. Washing and drying come into play in the loop as per nature of feedstock - clean rigid scrap often goes straight back post-grind; contaminated film, sheet & mixed post-consumer may need to sort and possibly a wet stage.
As the machines in your line interact with one another, it makes sense to think of them as part of an overall system—and then have some washing + drying integrated wherever feedstock calls for them.
The feedstock decides the route. That loop is a closed stream: crush, grind, sieve and store of the powder returns directly to compound with no washing stage - as long as the scrap is clean (with poly contamination kept below the acceptable level) and can be blended back in at any point along its path.
Other feedstocks are PVC film, sheet or post-consumer mixed material. Film could have ink and dirt; mixed scrap may have paper or other plastics (therefore all things wet & contaminated likely will not feed clean behind an extruder). Sorting needs to be done for incompatible materials. This is then treated using a crushing-washing-dewatering-dry-grinding or pelletizing method in another contaminated PVC material line of wet loop.
The core concept behind each of those loops is preserving the scrap to serve as a regular feed for production. It has same components like crusher or pulverizer / conveying & sieving, storage with washing and dryer if needed.
Another large apparatus, the plastic crusher, first breaks oversized blocks into pieces that fit through feeding windows in a pulverizer. These enter into the pulverizer where an immovable disc with fixed knives and a rotating disc containing movable knives slice material up to powder form. As long as the feed consists of pipe wall, profile flanges and offcuts, the grinding system ensures there is no deviation in output mesh.
The unit can have an inverter-driven main motor with frequency speed regulation, depending on its configuration. Stainless steel conveying pipes are used to reduce rust contamination during material transfer. Footage of the pulverizer running under load is in this video.
Grinding the PVC can generate heat - so if a pulverizer overheats its test sample of PVC too much as it grinds away to make regrind, that could end up yellowing or degrading the plastic itself; temperature control in machine impacts how much regrind a plant can use. It has air and water cooling system that takes away heat caused by friction, to maintain powder temperature during grinding.
You configure the mesh based on machine model. Output generally is in the 10-40 mesh range for the listed PVC pulverizers, and fineness can be controlled by modifying grinding disc clearance: discs closer together yield finer powder; farther apart gets coarser. The fineness required is recipe-dependent to the compound.
Powder is not dropped by gravity. An induced-draft fan maintains the chamber at a negative pressure and transports the powder along with an air stream from it through a cyclone, which separates most of the powder in size. Qualified powder goes to the silo after screening; oversize is recycled through a second pass, so what goes into the silo could be considered more consistent.
A dust collection system, with pulse cleaning if equipped, helps reduce airborne dust and keeps the workshop cleaner.The silo marks the transition from recycling to production: a mixer feeds recycled powder and virgin compound at preset ratios, completing the cycle.
The wet steps are necessary in case dirt, adhesive or other contaminants occur within the feedstock. After the crusher, materials move to a washing tank that agitates water (and dirt and other loose residues); then dewatering pulls out excess moisture before drying reduces overall levels for handling in following stages.
How much of that part a plant needs depends on scrap. Lightly soiled film may need only one pass through a wash and abbreviated time in the air, whereas heavy contamination needs more than that. Other types of peel from mixed plastics, multilayer material may need sorting or separation prior to reuse. That is a size question to answer relative the actual feedstock, and not an advance purchase stage.
Preparation for the next production stage as the last aspect of dry loop and wet loop. Blend the compatible recycled PVC powder (Colour, type etc.) or washed and dried material with virgin compound as per requirement prior to extrusion. The film and washing side of the line is covered on the Anda plastic recycling machine category page.
It is then down to the scrap that the plant genuinely produces, and what format of mesh the compound requires. Smaller mills can be used for limited production scrap, but clusters of lines or dedicated regrind areas show the need for larger pulverizers. The reference points:
Parameter | 22 kW unit | MF600 | MF800 |
Main motor speed | 2550 rpm | 2965 rpm | 2965 rpm |
Main motor | 22 kW (Nidec, Japan) | 45 kW (energy class 3) | 90 kW (energy class 3) |
Hourly output | approx. 250-350 kg/h | approx. 150-200 kg/h | approx. 400-600 kg/h |
Output powder | 10-40 mesh | 10-30 mesh | 20 / 40 mesh |
Feed material | 5-10 mm crushed scrap | 5-8 mm scrap | 5-8 mm scrap |
Cooling | 304 pipe, water cooling (2 layers) | 304 pipe, water cooling (2 layers) | 304 pipe, water cooling (2 layers) |
Dust removal | pulse, cloth bag + auto cleaning | pulse, cloth bag + auto cleaning | pulse, cloth bag + auto cleaning |
Voltage | customer standard | customer standard | customer standard |
The current lineup is detailed on the Anda PVC grinding mill product page. The voltage can be customized to the local standard of the customer. Actual output depends on the PVC material, target mesh and machine configuration.
When comparing pulverizers, energy consumption per kilogram of powder is another number to check. The actual figure needs to be measured under the same grinding conditions.
Why, in a PVC recycling line, every section only does one step - crusher holds the feed window; pulverizer maintains temperature and mesh; sieving keeps powder purely within the size continuum- wash/dry are not occurring unless fed with contaminated or wet material. If you size the grinding stage to the scrap you actually create, then that regrind is now a known input into compounding-not an unknown.
Zhangjiagang Anda Machinery Co., Ltd. manufactures plastic recycling and processing machines, from the crusher and pulverizer that start the loop to the mixing and extrusion equipment that closes it. The current range of machines is listed on the Anda Machinery website.
Usually no. Clean rigid scrap from an extrusion plant runs the dry loop - crush, grind, sieve, store, blend - and returns to compound without washing. The wet stages come in when the feedstock is film, sheet, or contaminated mixed material.
The powder leaves the pulverizer cool, with a two-layer water-cooling jacket on the chamber and water-cooled 304 stainless transfer pipes, so it can be dosed back into compound. The practical ratio is set by the compound recipe and the mesh the powder is ground to.
Output spans 10-40 mesh across the range. The clearance between the discs is adjusted from the outside of the machine, so the operator switches between finer and coarser settings without opening the chamber.
Send the scrap type (rigid, film or mixed), the target hourly tonnage, the mesh the compound needs and the local voltage standard to Anda, on the Anda contact page - it responds within one business day.
