FAQ

Advantages of 3 Different Screw Surface Treatments for Blown Film Extruders

2023-03-16

Improving the Efficiency and Performance of Blown Film Extruders through Surface Treatment of Screw and Barrel Components.

Blown film Extruders rely on the efficient functioning of the screw and barrel components to produce high-quality films. The continuous operation of these machines, however, can lead to the accumulation of polymer deposits and wear on the screw and barrel surfaces. To maintain the efficiency and performance of blown film extruders, proper surface treatment of these components is essential.

Surface treatment methods, such as coatings, platings, and polishing, can enhance the wear resistance, corrosion resistance, and durability of the screw and barrel surfaces. Each of these methods has its advantages and disadvantages, which should be considered when selecting the appropriate surface treatment for a specific application and budget.

Coatings as a Surface Treatment Method on Screw and Barrel

Coatings are one of the most common surface treatment methods for the screw and barrel of blown film extruders. The coatings are typically made of materials like tungsten carbide, chrome, or other ceramic materials that provide excellent wear resistance and durability. Coatings can be applied to the screw and barrel surfaces through a variety of methods, such as electroplating, thermal spraying, or chemical vapor deposition.

Advantages of Coatings:

Enhanced wear resistance: Coatings can significantly improve the wear resistance of the screw and barrel, extending the lifespan of the components and reducing maintenance costs.
Corrosion resistance: Some coatings like chrome provide excellent resistance against corrosion and oxidation, preventing the screw and barrel from deteriorating due to prolonged exposure to heat and chemicals.
Reduced friction: Certain coatings, such as Teflon, can reduce the coefficient of friction between the polymer melt and the screw and barrel surfaces, improving the flow of the melt and reducing energy consumption.

Disadvantages of Coatings:

High cost: Coatings can be expensive, depending on the material and application method. Moreover, some coatings require frequent reapplication, increasing maintenance costs.
Limited coating thickness: The thickness of the coatings is limited by the process, which can affect the degree of wear resistance provided.

Platings as a Surface Treatment Method on Screw and Barrel

Platings involve the deposition of a thin layer of metal, such as chrome or nickel, onto the screw and barrel surfaces through electroplating or electroless plating methods. Platings provide excellent corrosion resistance and durability, making them suitable for high-temperature and corrosive environments.

Advantages of Platings:

Corrosion resistance: Platings offer excellent resistance against corrosion and oxidation, protecting the screw and barrel surfaces from chemical attack and prolonged exposure to heat.
Enhanced wear resistance: Platings can improve the wear resistance of the screw and barrel surfaces, prolonging the lifespan of the components and reducing maintenance costs.
Cost-effective: Platings are generally more cost-effective than coatings, providing similar levels of protection at a lower cost.

Disadvantages of Platings:

Limited thickness: Platings are typically thin and may wear off over time, requiring frequent reapplication.
Limited materials: Platings are limited to metallic materials, which may not be suitable for certain applications.

Polishing as a Surface Treatment Method on Screw and Barrel

Polishing involves the use of abrasive materials to remove the surface layer of the screw and barrel, resulting in a smoother and cleaner surface. Polishing can be done manually or through automated processes, depending on the specific requirements and budget.

Advantages of Polishing:

Improved surface finish: Polishing can improve the surface finish of the screw and barrel, reducing friction and improving the flow of the polymer melt.
Reduced cleaning time: A smoother surface makes it easier to clean the screw and barrel, reducing downtime and maintenance costs.

Disadvantages of Polishing:

Limited wear resistance: Polishing does not provide the same level of wear resistance as coatings or platings, and the polished surface may wear off over time.
Limited application: Polishing is only suitable for certain types of materials and may not be applicable in all situations.

Conclusion

Proper surface treatment of the screw and barrel is essential to maintain the efficiency and performance of the blown film machine. Coatings, platings, and polishing are common methods used for the surface treatment of the screw and barrel, each with its own advantages and disadvantages.

Coatings are suitable for applications that require high wear resistance and corrosion protection but can be expensive and have limited coating thickness. Platings are more cost-effective than coatings and provide excellent corrosion and wear resistance but have limited thickness and are limited to metallic materials. Polishing improves the surface finish of the screw and barrel, reducing friction and improving the flow of the polymer melt, but has limited wear resistance and is only suitable for certain materials.

Ultimately, the choice of surface treatment method depends on the specific application and budget. Consult with a professional and experienced surface treatment provider to determine the most suitable method for your blown film machine's screw and barrel to maintain its efficiency and performance. Proper maintenance and care of the screw and barrel through surface treatment can significantly extend the lifespan of these crucial components and reduce maintenance costs.

If you have any blown film extrusion machine needs or questions, welcome to contact us!