Contents
1What Purging Compound means
Purging Compound Or screw purging pellets and injection-machine purging pellets. A specialty material built to Clean screw barrels and screws Of injection, blow and extrusion machines. Removing old resin, color and carbon residue for contamination-free material, color and job changes.
Purging Compound is not idle plastic pellets. It is an engineered polymer formulated for properties Opposite to general resin Where it matters
23 main Purging Compound types
| Type | Working principle | Pros and cons |
|---|---|---|
| Chemical Purging | Formula reaction or expansion helps split residue | Verify temperature, dwell time, odor, fumes and each formula maker limits |
| Abrasive Purging | Additive-boosted mechanical scrubbing | Verify fitness for screws, flow paths and fine-clearance parts |
| Mechanical Purging ⭐ | Flow properties and shear carry residue out | ASACLEAN sits here, but grade and steps must match machine and resin |
ASACLEAN is a Mechanical Purging Compound with some Glass Fiber-blended grades for extra mechanical cleaning. GF grades serve only manual-listed systems, barred from Hot Runner or fine flow paths the maker has not cleared.
3How Mechanical Purging works — 3 principles
ASACLEAN runs 3 simultaneous mechanisms:
- Rheology Control: ASACLEAN matrix designed for high Melt Viscosity. Tacky-thick flow drags residue out
- Shear Cleaning: Rotating screws shear ASACLEAN matrix against metal, sweeping stuck residue
- Encapsulation: In-pellet Cleaning Agent wraps released residue against re-sticking, carrying it out with discharged pellets
4Rheology: why viscosity matters
Rheology Is the science of material flow and deformation. In molten plastics the key rheology is Melt Viscosity (η) at melt temperature
Common units Pa·s or Poise. Viscosity shifts with resin type, temperature and shear rate. Never substitute one range for every material. Grade choice should cite the grade manual temperature range and terms.
When viscosity runs high:
- Barrel-wall shear climbs, so residue sweeps better
- Material never dodges dead spots but pushes in displacing old resin
- Plug flow completes material changes faster
5Shear Force and unreachable zones
Natural low-shear points inside screw barrels:
- Behind screw tip (Behind Tip / Sprue Bushing)
- In check ring / non-return valve
- At nozzle land and adapter walls
- Screw-flight roots
These are Dead Spots standard resin flows past unswept. ASACLEAN uses rheology plus glass fiber (in GF grades) to reach these zones beyond plain resin.
6What Cleaning Agent in ASACLEAN does
Cleaning Agent is the ASACLEAN-pellet mix that:
- Weakens residue-to-metal attraction: Like dish soap loosening grease
- Temporarily coats screw surfaces: Against re-sticking during purging
- Disperses released residue as micro-particles: For even discharge without big clogging lumps
Why new-resin purging fails this. No Cleaning Agent.
7ASACLEAN vs new-resin purging
| Logged criterion | Baseline: new-resin purging | Controlled trial: ASACLEAN |
|---|---|---|
| Material used | Weigh resin to QA pass | Weigh ASACLEAN plus rinse resin combined |
| Color and material time | Clock old-job-stop to good parts | Same start and approval gates as baseline |
| Startup scrap | Log reject kg or counts | Same units and collection windows |
| Contaminants | Count Black Specks and streaks to QA gates | Compare many rounds, never conclude from one trial |
| Cost per job | Total material, scrap, labor, downtime | Calculate from real results net of purging-compound cost |
Results depend on machine, resin, color, build-up and operating steps. Trial controlled for at least several rounds, then use ROI calculator With real plant data
Trial ASACLEAN free on your machine
Starting from free samples plus step advice from the CSC technical team
8When to use Mechanical Purging
- Color Change, especially dark to light
- Material Change across different types
- Before long stops (overnight, weekends, long holidays). Use as Sealing Material
- Machine startup after long stops, purging possibly degraded resin
- Black Specks or streaks in parts
- Run Routine Purging On a preventive table
9FAQ
Is ASACLEAN safe for Hot Runner?
Use Glass-fiber-free (Non-GF) formulas in maker-listed Hot Runner grades such as RU, RE, SL or PF. Glass-fiber grades such as newEX and RX are barred from Hot Runner. Other Non-GF formulas still need manual and system-limit verification first. (RX: Not yet available in Thailand) Hot Runner purging guide
Which grade to start first use with?
For general non-Hot-Runner injection, start from GL3 Or newEX Broad-coverage grades. Ask technicians to pick for your machine and resin.
How much per use?
No single amount fits every machine. Start from grade advice and Shot Size or Barrel Capacity data, then tune to discharge cleanliness. Real amounts belong in the post-trial SOP.
How long does ASACLEAN keep?
Check production date, lot number, shelf life and storage terms on the pack or grade documents. Keep bags sealed against moisture. Oven-dry only where the grade manual states.