• your position
• HOME > NEWS >

What is the difference between a melt pump and a single-layer co extruded PVC profile extruder?

The melt pump and single-layer co-extrusion PVC profile extruder play distinct roles in the plastics processing industry, with notable differences mainly manifested in the following aspects:

I. Definition and Function

Melt Pump:

Definition: A melt pump is a positive displacement transfer device primarily used for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts.

Function: It pressurizes and stabilizes the high-temperature melt from the extruder, feeding it into the extruder head at a stable flow rate to enhance product quality and precision while reducing costs.

Single-Layer Co-Extrusion PVC Profile Extruder:

Definition: A single-layer co-extrusion PVC profile extruder is a specialized equipment designed to process PVC and other plastic materials into specific profiles.

Function: Through processes such as heating, plasticizing, and extruding, it transforms PVC granules into profile products with defined cross-sectional shapes, such as window and door frames, pipes, etc.

II. Structure and Composition

Melt Pump:

Primarily comprises a pump housing, driving gear, driven gear, sliding bearings, front and rear end plates, and packing seals.

Utilizes self-lubrication by the melt, with lubrication grooves on the sliding bearings, providing excellent wear resistance.

Single-Layer Co-Extrusion PVC Profile Extruder:

Relatively complex in structure, encompassing a feeding system, screw extrusion system, heating and cooling system, and mold system.

The screw is a crucial component, rotating to forward the plastic material while simultaneously completing the plasticizing process.

III. Working Principle

Melt Pump:

Transports the melt through the volumetric changes caused by the meshing of the driving and driven gears.

As the gears rotate, the melt is drawn into the tooth spaces and conveyed to the outlet pipe, achieving pressurization and stabilization.

Single-Layer Co-Extrusion PVC Profile Extruder:

Through the rotation of the screw and heating of the barrel, PVC granules are plasticized into a molten state.

The molten plastic is then extruded through the die under the thrust of the screw, forming profile products with specific cross-sectional shapes.

IV. Application and Effect

Melt Pump:

Widely applied in extrusion molding production lines for plastics, resins, and rubber products, including granulation, film, pipe, and sheet production.

Capable of stabilizing output pressure, improving product quality, reducing waste rates, and simultaneously lowering extruder load, thereby conserving energy.

Single-Layer Co-Extrusion PVC Profile Extruder:

Dedicated to the production of PVC profile products, such as window and door frames, pipes, etc.

By adjusting the mold and process parameters, it can produce PVC profile products with various cross-sectional shapes and specifications.

In conclusion, the melt pump and single-layer co-extrusion PVC profile extruder exhibit clear distinctions in terms of definition, function, structure and composition, working principle, as well as application and effect. The melt pump primarily serves as an auxiliary device in extrusion lines, providing melt pressurization, stabilization, and metering, whereas the single-layer co-extrusion PVC profile extruder is the core equipment directly used for the production of PVC profile products.

Email: info@battemachinery.com

WhatsApp: +86 158 38331071

pre:What are the application ranges of melt pumps for blown film extruders?

next: waste plastic PP PE film recycle granulating pelletizing melt pump and screen changer