Product data
| Name | Screw Barrel Solution for Thermoset Plastic Processing |
|---|---|
| Typical Application | Phenolic resins, BMC/DMC |
| Process Method | Injection |
| Material Recommendation | 38CrMoAlA, DC53, Bimetallic |
| Surface Treatment | Bimetallic |
| Hardness | HRC 56 - 60 |
| L/D Ratio | 12:1 to 18:1 |
| Max Temperature | ≤ 150°C (302°F) |
Technical Challenges
- Thermoset materials cure irreversibly under heat and shear, so any excess residence time or temperature causes the resin to set inside the screw and barrel.
- Abrasive fillers (glass fibre, mineral) in BMC and DMC compounds wear screw flights and barrel bore rapidly.
- Low compression requirement means standard screws over-shear and pre-cure the material before the cavity.
- Cured material build-up in the barrel or on the screw requires frequent cleaning and downtime.
Rootier's Technical Solutions
- 01Low-compression screw geometry engineered to minimise shear heat and prevent pre-cure during plasticising.
- 02Hard-chromed screw and barrel surfaces that resist abrasive fillers and release cured resin easily.
- 03Bimetallic-lined barrels for wear resistance against glass- and mineral-filled BMC/DMC compounds.
- 04Optimised L/D ratio (12:1–18:1) that keeps residence time short and temperature controlled.
- 05DC53 and bimetallic screw tips that survive the abrasive, curing feedstock.
Frequently Asked Questions
Epoxy, phenolic, polyester, PU, silicone, melamine formaldehyde — undergo irreversible curing when heated.
Electrical insulators/connectors, automotive under-hood parts, appliance housings, composite matrices, adhesives/sealants, high-temp resistant parts.
Precision temp control, large feed zones with minimal shear, barrel should equipped with oil cooling channel for temperature control.
Crosslinking inside screw/barrel from excess temp, long residence time, or contamination causes blockages, defects, reduced output, and dangerous pressure buildup.
Glass/mineral fillers and flame retardants increase abrasiveness. Must account for filler type/concentration, enhance wear resistance via coatings or bimetallic construction, and consider impact on cure chemistry & flow.