Product data
| Name | Screw Barrel Solution for Fluoropolymer Processing |
|---|---|
| Typical Application | PTFE, PFA, FEP, ETFE |
| Process Method | Injection, Extrusion |
| Material Recommendation | Inconel 625, C276, 440C |
| Surface Treatment | Electropolishing (Ra < 0.2μm), Hard Chromed, PVD |
| Hardness | HRC 45 - 55 |
| L/D Ratio | 12:1 - 20:1 |
| Max Temperature | ≤ 380°C (716°F) |
Technical Challenges
- Fluoropolymers are highly corrosive at processing temperature, attacking steel screw and barrel surfaces and releasing HF that pits conventional materials.
- High melt viscosity and low flow demand higher processing temperature and pressure, increasing screw and barrel wear.
- Strict purity requirements for semiconductor and medical applications forbid contamination from worn screw flights.
- Thermal sensitivity means overheating degrades the resin and generates corrosive off-gassing.
Rootier's Technical Solutions
- 01Screws and barrels built from nickel-based superalloys (Inconel 625, C276) for corrosion resistance against fluoropolymer off-gassing.
- 02Electropolished melt channels (Ra < 0.2μm) that reduce resin adhesion and prevent contamination.
- 03Low-shear screw geometry tuned for high-viscosity fluoropolymer melt without overheating.
- 04Hard chrome plating and PVD coatings that add a corrosion barrier over the base metal.
- 05440C stainless steel components for environments demanding both corrosion and wear resistance.
Frequently Asked Questions
PTFE, PVDF, FEP, PFA, ETFE — each with different processing characteristics and temperature requirements.
Chemical equipment linings, semiconductor components, aerospace seals, medical devices, wire/cable insulation, high-purity fluid handling.
Large feed zones, low compression ratio, precise zone temperature control, degradation-resistant materials, low-adhesion screw surfaces.
Processing at 350–400°C risks decomposition and corrosive byproducts; high viscosity needs specialized geometry; conventional designs cause degradation, carbonization, and wear.
Match grade-specific processing temp range, viscosity, degradation tendency at long residence times, and output rate. PTFE needs different handling than PVDF/FEP.