Introduction:
The adhesive extruder applies a glue layer to bond the anti-corrosion (FBE) layer with the top layer (PE or PP) in a 3-layer pipe coating system. This adhesive layer is typically around 0.25 mm thick. The adhesive and main extruders share similar functionality and configuration, aside from differences in extruder size and die width.
Solution:
This specially designed adhesive extrusion system melts adhesive granules into a uniform mass before applying the coating material onto the pipe. A pressure roller system prevents air entrapment under the top-coat layer. Alternatively, an adhesive powder application system is available, mainly used for small-diameter sleeve applications.
Key Features:
- Versatile Extrusion Options: Compatible with both flat-head and cross-head (ring) extrusion dies. A flat-head extrusion die is used for side-extrusion (wrapping) applications, while a cross-head extrusion die accommodates pipe diameters up to 24” in a sleeve/hose extrusion process.
- Screen & Screen Changer: A screen between the extruder and extrusion die filters out unmolten particles. If the screen becomes too polluted, an alarm signal alerts the operator. The hydraulic screen changer allows for screen replacement during production.
- Pressure Roller System: Ensures proper adhesion of the adhesive layer to the pipe surface and prevents air entrapment.
- Granule Drying & Pre-Heating: Removes moisture from granules to prevent gas formation that could cause coating defects. Pre-heating the granules increases extruder efficiency and prevents unmolten particles.
- Flexible Orientation: In a wrapping application, the sheet can be applied from the side or from the top using a lifting platform.
- Advanced Controls: The system features a modern control panel with an HMI interface for seamless operation.
Benefits:
- Optimized Extruder Design: Traditional extruders perform better with LDPE than HDPE. Selmers’ specialized extruder is designed specifically for HDPE pipe coating applications and delivers high output for PP materials at a competitive price.
- Comprehensive System: Selmers provides a full solution, from granule feeding to pipe application, eliminating the need for multiple suppliers.
- Wide Output Range: The extruder operates efficiently at both high and low RPMs, allowing for a broad range of pipe diameters to be processed.
- Enhanced Cooling: Features a bushing water-cooling design without O-rings for improved reliability.
- Space-Saving Design: The compact frame requires minimal installation space.
- Easy Maintenance: Modular construction simplifies maintenance and reduces downtime.
How It Works:
The adhesive extruder system applies adhesive to the FBE-coated pipe surface before the HDPE or PP top-coat layer is added.
Adhesive extruder
The Full Scope:
- The adhesive extruder is typically used in a pipe coating line combined with various other process equipment, such as pipe handling system, pipe-heating system, FBE powder application, main extruder system and quench system.
Innovate better together
By mutual learning, we have grown to who we are today. A trustworthy supplier of a multitude of automated solutions. Do you want to optimize performance and reduce risks? Send an email to sales@selmers.com or call +31(0)251211999, or fill in a contact form via https://www.selmers.com/contact and we’ll get back to you.
