ASTM 100% Virgin HDPE LDPE PVC HDPE Pond Liner in Indonesia/ Philippine/Thailand/Malaysia

The first step in the production of HDPE geomembrane is the selection of raw materials. High-quality HDPE resin pellets are chosen as the primary raw material. These pellets are thoroughly inspected with state-of-the-art equipment to ensure their quality. High quality raw materials are key to producing a successful product as this will determine the consistency in thickness and tensile strength.

After the inspection of the raw materials is complete, the manufacturing process starts with the extrusion process. HDPE pellets are melted in a screw extruder to form a high-density polymer. The molten polymer is then extruded onto a flat surface in a continuous manner. This flat surface can be in the form of a calender machine or extrusion die depending on the manufacturing method selected.

A key aspect during the production process is to ensure that the HDPE geomembrane maintains its uniform thickness and density. This uniformity is critical to ensure that the geomembrane is robust enough to withstand environmental stresses such as extreme temperature fluctuations or UV radiation exposure.

After the continuous extrusion process is complete, the HDPE geomembrane goes through multiple quality control checks. Here, the thickness is measured, and any anomalies such as holes, punctures, or defects are detected, and the appropriate modifications are made to remove them. These quality control checks are crucial to ensure that the final product meets the specifications and industry standards.

• The extraction of precious metals from ore using heap leaching is a common method of production. The ore is placed on geomembrane-lined heap leach pads and the ore-laden solution is drained through lined ditches into impoundments for holding prior to extraction. These ditches are subject to intense sunlight, and in many conditions, extreme thermal expansion and contraction.
• The conditions require a UV-stable, low thermal expansion-resistant geomembrane. Additionally, longevity and constructability are important as mining operations are often in rugged environments.

• Creating a heap leach on a flat pad, on-off pad or valley pad typically requires only a single composite liner. A composite liner incorporates multiple layers-such as a geosynthetic liner and geotextile-to provide several benefits in a single product. Most heap leach pads will start with the foundation, or subgrade, with a low-permeability layer directly above. The low-permeability and absorption layer will comprise compacted clay (if it can be locally sourced) or a geosynthetic clay liner (GCL) made with bentonite. Directly above the clay/GCL is the geomembrane liner with low permeability for containment. A protection layer is placed above the geomembrane and is made with a geotextile, padding and separating the geomembrane from the heap. Above the geotextile is the mineral drainage layer, which includes the piping system to collect the solution.

1.Textured or Smooth hdpe Geomembrane?
A textured product is either needed or is not. This apparent truism needs to be remembered in many cases in which a product is specified for a project which clearly does not qualify to be designated as textured yet is designated as such, creating a huge confusion about the uncertainty of the client's needs.
If the client does not clarify they require, it is hardly feasible to offer the right solution in conditions comparable to any concurrent company.

2.Is a hdpe Geomembrane with a wider roll better?
There is a technical limit for manufacturing geomembranes. In high density polyethylene (HDPE), this is 7.5 to 8m. Beyond this limit, either the raw material is not an HDPE and is instead a softer material which enables the extrusion-header system of the machine to complete the geomembrane transformation cycle, or the uniform thickness or thermal treatment parameters of the raw material have been seriously compromised. Within these limits and exceeding a minimum width, under which it would be unreasonable to present a product for the Safe Containment application, the roll width is the choice of the manufacturer, usually subject to the presentation format and transport cost optimisation.
There is hardly any difference between the cost of machines for given widths.
Within these limits, it is true that a wider roll relieves installation costs in large projects by a small percentage; however it is always at the expense of a higher cost of handling bulk unit weight of the roll or overruns in the finishing of curves or corners.

3.Differences between LLDPE  and HDPE geomembrane?
Linear low density polyethylene (LLDPE) and high density polyethylene (HDPE) are raw materials which are similar in terms of composition, but very different in their behaviour, as has already been discussed in previous sections.
HDPE has become a global standard for Safe Containment applications precisely for its unique properties and marketing an LLDPE as an HDPE in these applications is tantamount to offering a substitute product without any benefit to the client. Differentiating them is very simple.