Plasticizing screws engineered and manufactured to optimize the plasticizing process
MRS produces plasticizing screws starting from an analysis of the required process, the characteristics of the polymers, and the productivity targets. Each plasticizing screw produced by MRS is based on a thorough assessment, with the goal of optimizing the plasticizing process and sustaining productivity over time using the most suitable metallurgical construction.
MRS combines extensive experience with design creativity to deliver innovative screw geometries and high-performance patents, backed by extensive manufacturing know-how in special steels, heat treatments, and hardfacing overlays.
Ø 18 – 300 mm
- Outside diameter
6.600 mm
- Maximum length in a single piece
For every application and polymer family
- Screw geometries
Special steels and specific heat treatments
- Materials
Anti-wear coatings options
- Durability
Metallurgical and manufacturing solutions to maintain process performance over time
- Performance
Base Materials
Selecting the base steel is the first step in defining screw performance. MRS employs different metallurgies suited to distinct applications:
| Werkstoff Number | DIN Designation |
| W1.8519 | 31CrMoV9 |
| W1.8550 | 34CrAlNi7 |
| W1.8509 | 41CrAlMo7 |
| W1.4122 | X 35 CrMo 17 |
| W1.2379 | X 155 CrVMo 12 1 |
| W1.6566 | 18 NiCrMo5 |
| W1.7225 | 42 CrMo 4 |
| W1.6511 | 39NiCrMo3 |
| W1.4542 | 17 4PH |
| W2.4856 | Inconel 625 |
| W2.4819 | Hastelloy C276 |
Patents
Barrier plasticizing geometry SASAMELT® EP2204272B1, US8.870.442B2
The patented SASAMELT® barrier plasticizing geometry represents a major evolution over traditional barrier solutions; design innovations improve plasticizing and the quality of the melt.
Key benefits of the SASAMELT® barrier geometry:
- Higher and improved plasticizing capacity
- Optimal mixing of color master batches, with the possibility to reduce usage percentage
- Lower melt temperature
- Homogenization and uniform distribution of the melt temperature
- Self-cleaning of plasticizing channels within the barrier geometry, avoiding stagnant zones
- Higher hourly output with potential cycle-time reduction in injection molding
- High versatility: suitable for processing thermoplastics of different natures (semi-crystalline, amorphous, and special compounds)
The SASAMELT® barrier geometry, in combination with MRSSDS® and SASAMIXER® mixers, further optimizes melt-temperature uniformity and masterbatch dispersion.
Mixing elements MRSSDS® EP1459867B1, US7.036.974B2 and SASAMIXER® EP015462138
MRS-developed and patented mixing elements ensure optimal mixing action and higher production efficiency, with significant benefits to plasticizing performance.
Advantages observed across applications:
- Increased mixing uniformity and intensity
- Reduced shear with higher throughput
- Lower melt temperature
- Uniform distribution of melt temperature
- Lower masterbatch percentage
- Reduced energy consumption, due to lower temperatures and increased throughput
- High self-cleaning factor that reduces scrap
- Wide application range: excellent results in injection molding, blow molding, and extrusion, with diverse resins and across both extrusion and injection processes
