Screw barrel for LDPE
Screw barrel for LDPE material
LLDPE screw barrels are essential components in extrusion equipment designed for Linear Low-Density Polyethylene (LLDPE). These screw barrels are crucial for melting, mixing, and extruding LLDPE resins into various products, ensuring uniform melt distribution, controlled cooling, and precise dimensional accuracy required for different LLDPE product specifications
For blowing PP, PE, LDPE, and HDPE film, you would generally use a specific type of screw and barrel design known as a “blown film screw barrel.” This design is optimized for the unique requirements of the blown film extrusion process.
Here are some key features and considerations for a screw barrel used in blowing PP/PE/LDPE/HDPE fil
Screw Design: The screw for blown film extrusion is typically designed as a "grooved feed" screw. It has deep flights and grooves along its length to facilitate good resin melting, mixing, and conveying. The flight depth and pitch may vary depending on the specific material being processed.
Barrier Mixing Section: Blown film screws commonly have a barrier mixing section near the end of the screw. This section helps to enhance the mixing of the polymer, ensuring consistent melting and distribution of additives.
High Compression Ratio: The screw usually has a high compression ratio to improve melt homogeneity and provide uniform viscosity. This is important for achieving good bubble stability and film quality.
Barrel Construction: The barrel is typically made of high-quality alloy steel with proper heat treatment for excellent wear resistance and durability. Nitriding or bimetallic barrels can also be used to enhance wear resistance for extended service life.
Cooling System: Screw barrels for blown film extrusion often feature a cooling system to regulate the temperature and prevent overheating during the extrusion process.
Optional Features: Depending on specific requirements, additional features like a melt pressure transducer or a melt temperature sensor can be incorporated into the screw barrel to provide monitoring and control capabilities.
It's important to consult with a reputable screw barrel manufacturer or supplier to ensure you get the appropriate screw barrel design for your blowing PP/PE/LDPE/HDPE film application. They can provide expert advice based on your specific production needs, material properties, and expected output requirements.
Specification:
Screw diameter:Ø15-Ø300 Aspect ratio:15-46
Product type:
For
different plastic products screw can be used: ordinary type, pin type,
barrier type, separation type, exhaust type and so on.
Base material:
1)38CrMoAlA(JIS SACM645) 2)42CrMo(AISI 4140)
Process:
Heat treatmet Nitriding treatment
Technical Parameters:
Nitriding depth: 0.50mm-0.80mm
Nitriding hardness: 900-1000HV
Nitriding: <= Level 1
Surface roughness: Ra 0.4
Screw straightness: 0.015mm
The hardness of the surface after chrome plating:≥950HV
Chromium layer thickness: 0.025~0.085mm
Double alloy depth: 3mm
Benefits
Uniform Melt Distribution and Dimensional Accuracy
LLDPE screw barrels ensure uniform distribution of molten LLDPE resin within the extrusion die, resulting in consistent product dimensions and quality. This enhances product performance and reduces material waste.
Enhanced Durability and Wear Resistanc
Our screw barrels are manufactured from high-grade materials such as nitrided steel, bimetallic alloys, and tungsten carbide coatings, offering exceptional wear resistance and extended service life. This minimizes downtime and maintenance costs.
Optimized Processing Parameters
By optimizing screw geometry and material composition, our screw barrels improve extrusion parameters such as cooling efficiency, melt homogeneity, and line speed control. This enhances production efficiency and reduces energy consumption.
