How to manufacture Geomembrane?

1.100% virgin Raw Material

Wish ISO9001 quality system, Our quality control system for geomembrane manufacturing starts with the testing of the raw materials. The resin manufacturers provide documentation to ensure that the raw materials comply with our specifications.

Geomembrane material

Resin suppliers report the following properties:

Density

The property is a measure of unit weight and is an indicator of the degree of crystallinity. It can be related to the material’s chemical resistance, rigidity, permeability, tensile strength, and deformation characteristics.

Melt Index

The property is an indicator of the molecular weight and rheological properties of the polymer and can be related to the processability.

Carbon Black Content

The carbon black content is an important property to ensure protection against ultraviolet radiation. The raw materials may be pre-compounded with the carbon black. However, if resins are not pre-compounded, we will supplement them with the appropriate quantity of carbon black before manufacturing liner.

2.Blowing Process

hdpe geomembrane liner blowing process

Polyethylene resin is pumped directly from storage silos to hoppers .

Hoppers feed resin into the extruder. The resin is heated to the melting point in the extruder barrel. It is conveyed through the barrel by the rotation of a specially designed screw which, in conjunction with heating elements along the barrel, provides consistency to produce a molten polymer stream.

The molten stream is forced through a screen pack, which act as a final filter for impurities or contaminants, and up through a die. It extrudes from the circular die as a film tube (“bubble”), pulled vertically by a set of nip rollers located at the top of a cooling tower. An IBC (Internal Bubble Cooling) unit, part of the extruder, maintains consistent bubble diameter. Material gauge is monitored and maintained by a computer system which controls the operation of the extruder.

At the top of the tower the bubble passes through a collapsing frame and is pulled through the nip rollers. The material is directed back toward the ground, and continues cooling as it approaches a winding machine. Before being taken up by the winder, the tube is split and spread to its deployable width. The winder rolls the finished geomembrane onto a specially made heavy-duty core.