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² Definition
HDPE geomembrane is a geosynthetic material made of high density polyethylene as the main raw material. It has the characteristics of tight molecular chain arrangement, high crystallization, thickness of 0.25-3.0mm, with excellent seepage resistance and good mechanical properties, widely used in water conservancy, environmental protection and many other engineering fields.
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² The characteristic advantage of high-density polyethylene geomembrane
1. Strong chemical stability
1) Excellent anti-aging performance:
high-density polyethylene geomembrane has excellent anti-aging characteristics, and can maintain its structure and performance stability under natural environmental conditions such as sunlight and wind and rain for a long time.
2) Outstanding corrosion resistance and acid and alkali resistance:
whether it is a variety of acid and alkali substances that may be contained in the pond water, or corrosive components in the soil, high-density polyethylene geomembrane can effectively resist. It provides a safe and stable living environment for the creatures in the pond.
2. Good physical properties
1) High tensile strength and tear resistance, puncture resistance:
In the daily use of the pond, it may face various external forces, such as water impact, biological activities on the bottom of the pond, and the operation of the pond cleaning equipment. The high tensile strength of high-density polyethylene geomembrane enables it to withstand large tensile forces without breaking.
2) Very low permeability coefficient:
Water leakage is one of the key problems to be solved in pond liners. With its extremely low permeability coefficient, high-density polyethylene geomembranes can almost prevent the penetration of water molecules, and can efficiently keep the water in the pond within the pond range.
3. High durability
1) Long service life:
Combining its chemical stability and physical properties, the service life of high-density polyethylene geomembrane is usually long. Under normal pond use environment, its service life can reach 10-20 years or even longer, which has extremely high economic benefits in the long run.
2) Resistance to natural and biological damage:
It can not only resist various harsh conditions in the natural environment, such as cold and hot summer, wind, frost, rain and snow, but also effectively resist the destruction of biological factors.
² The service life of high-density polyethylene pond liners under different conditions
Usage Conditions | Service Life |
Made from brand new raw materials and not exposed to the sun | Generally more than 20 years. |
Made from brand new raw materials and exposed to the sun | Usually about 5 - 10 years. |
Made from recycled materials and not exposed to the sun | Generally more than 10 years. |
Made from recycled materials and exposed to the | Probably 3 - 5 years. |
Under ideal conditions (with specific additives, etc.) | Some products can reach 50 - 70 years. |
² Factors affecting the service life of high-density polyethylene pond liners
Influence Factors | Details |
Material Quality | High-quality virgin HDPE resin with good molecular structure and purity offers better durability and resistance, potentially extending service life to 30 - 50 years. Inferior or recycled materials may have shorter lifespans, usually 5 - 15 years. |
UV Exposure | Long-term and intense sunlight exposure accelerates material aging. In direct sunlight without UV protection, the liner may degrade in 5 - 10 years. With proper UV stabilizers or shading, the lifespan can be prolonged to 20 - 30 years. |
Temperature Fluctuation | Frequent and large temperature changes cause material expansion and contraction, leading to cracks or weakened joints. In regions with extreme temperature differences, the service life might be 10 - 20 years. In milder climates, it could be 20 - 30 years. |
Chemical Substances | Contact with strong acids, alkalis, disinfectants, or high-concentration fertilizers in the pond water can corrode the liner. If exposed to such chemicals regularly, the lifespan may be reduced to 5 - 15 years. With minimal chemical exposure, it can last 20 - 30 years. |
Installation Quality | Proper installation with accurate laying, secure seams (welded or joined well), and proper anchoring prevents damage and leakage. Well-installed liners can serve for 20 - 30 years. Poor installation may result in early failures within 5 - 10 years. |
Usage and Maintenance | Frequent large water level changes, mechanical impacts, or lack of regular inspections and repairs shorten the lifespan. With careful use and regular maintenance (checking for leaks, patching small damages), it can last 20 - 30 years. Without maintenance, it may only last 5 - 15 years. |
² Application of high density polyethylene geomembrane in pond liner
1. Key applications in shrimp ponds
1) The help of disinfection and sterilization:
In the disinfection and sterilization process of shrimp ponds, high-density polyethylene geomemofilm plays an important role. Its smooth surface makes pond cleaning and disinfection more thorough. Because the water is not directly in contact with the soil, it also avoids the risk of producing highly toxic products of shrimp due to the reaction of some substances in the soil with water, creating a good start for the healthy growth of shrimp.
2) Manage pond health and safety:
As a pond bottom liner, it acts as a solid barrier, strictly controlling water penetration and pathogen entry. In the process of shrimp cultivation, shrimp have higher requirements for water quality and environment, and geomembrane can effectively isolate external pollution and prevent bacteria, parasites and other harmful organisms from the bottom of the pond or the surrounding soil to invade the pond water body.
2. Construction points and precautions
1) Careful preparation before laying:
Before laying high-density polyethylene geomembrane, the pond laying area must be thoroughly inspected and measured. According to the shape and size of the pond, prepare the geomemofilm material with the exact size to avoid the splicing difficulty or waste caused by the improper size of the material. At the same time, make sure that the foundation of the laying area is smooth and solid.
2) Standard operation of the laying process:
laying is usually carried out by pushing down from the top, which can make the geomembrane stretch naturally under the action of gravity to ensure that the film surface is smooth and straight. During the laying process, the overlap width between adjacent geomemes should be strictly controlled, and it is generally appropriate to keep it at about 15 cm.
3) Precise control of hot melt welding:
hot melt welding is a key step to ensure the sealing performance of the geomembrae splicing. In the welding process, it is necessary to accurately control the temperature change of the welding equipment, so that the two films are perfectly pressed together at the right temperature and pressure. The operator must have skilled skills and rich experience to ensure that the weld is neat and beautiful, without slip welding and jump away.
4) Strict implementation of water leakage inspection:
After the entire geomembrane is laid, a comprehensive leak inspection must be carried out. This is the last hurdle to ensure the quality of the pond liner. Visual inspection can be used to check whether the film surface has obvious damage, holes or poor welding. At the same time, more accurate methods such as aeration test and damage test can be used to fully assess the leakage of the pond liner.
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² Summarize
HDPE geomembrane has the advantages of strong chemical stability, good physical properties and high durability, and has excellent application performance in the field of pond lining, especially in shrimp ponds. It plays an irreplaceable role in ensuring the water quality of the pond, controlling leakage, improving the health and safety level of the pond and prolonging the service life of the pond. With the continuous development of material science and the continuous progress of pond aquaculture and other industries, the application prospect of high-density polyethylene geomembrane in pond liners will be broader, and it is expected to bring efficient, stable and sustainable development guarantee for more pond projects.
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