4-METER HDPE DIMPLED SHEET EXTRUSION LINE
www.amut.it

AMUT GROUP has recently manufactured and tested a plant for the production of HDPE dimpled sheet, with a net width of 4 meters, for a Russian customer, being one of the biggest producers of materials for the building sector. An important technological goal, proof of the Group's continuous investments in R&D towards ambitious projects assuring high performances.

The HDPE dimpled sheet is largely used to protect and provide drainage for the underground walls and it is the latest solution for the proper protection and ventilation of the waterproofing mantle between cement foundations and ground.
Furthermore, its versatility makes it essential for the realization of buildings in zones where water presence is particularly high.

The line has a capacity higher than 1700 Kg/h and it offers the possibility to produce articles using all 4000 mm or, by applying a central cutting, to obtain 2 coils of 2000 mm each or even 4 coils of 1000 mm each coils maximum diameter is 490 mm.
The linear kinematic speed is equal to 12,5 m/min and the thickness range varies from 350 to 1000 g/sm.

The line, based on a EA 180 single screw extruder with L/D 45, is able to process material in granules as well as trims/flakes or post consume HDPE bottles, always assuring a uniform feeding, even when processing raw materials having different granulometry.
The line is composed of the following sections:
• loading system;
• raw materials dosing unit;
• single screw extruder with a plasticization capacity of more than 1800 Kg/h and equipped with a vacuum vent system with closed loop circuit for water, used in case of material coming from post consume bottles at the extraction of volatile components;
• continuous screen changer with increased screening;
• gear pump with high pressure, capable to process also potential types of polymers with a high molecular weight;
• flat die with melt exit width higher than 4.300 mm, so perfect to produce the maximum width even on low potential thicknesses of the finished product smaller than 300 g/sm.

It is also included a special calendaring/forming group with particular solutions, realized thanks to AMUT wide experience in the thermoforming field. Such a width, combined with the linear speed demanded by the contract production guarantees 10 m/min of finished product, requested an accurate study of the two main forming rolls cooling flows made by means of recirculation/thermoregulation pumps; as well as a system for forming vacuum distribution capable to satisfy the different needs connected with the requested types of finished product.

Since the line can process 100% of post consume material, even the vacuum group had to be designed with condensation/reduction systems for the extrusion fumes which are potentially present as a pollutant in the melt and certainly problematic in the vacuum circuit.
Downstream the calendaring/forming unit, an unwinding/lamination station has been installed to allow the introduction of 4-m wide geotextile materials. This station is complete with a distribution system of the hot melt glues used for different support/reinforce materials adhesion.
The end-line is composed of an automatic winder complete with a bench for the finished coils unloading/stacking.
The plant is also equipped by complementary and ancillary equipments such as:
- a group for the bilateral unwinding of the advertising/signaling strap directly applied during the forming phase;
- a grinding group for trims complete with a transport system to convey the ground material directly in the raw material loading/mixing zone.

A proprietary Software, developed and tuned specifically for this line particular exigencies, controls and checks all activities and parameters, by storing and monitoring the whole production process.


Mailto: info@amut.it

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