The product quality of the anti-seepage geomembrane has always been the content to be tested at the start of each project, especially the uniformity of its thickness. The thickness of the geomembrane varies from, the uniform thickness is important for the anti-seepage geomembrane to ensure product quality and prevent optical deformation. Which requires the geomembrane manufacturer and supplier to carry out the necessary control on the production of the anti-seepage geomembrane, and in the production process, there are many factors that affect the thickness of the anti-seepage geomembrane.
1. Factors of Geomembrane production equipment
①.Uneven thickness of the impermeable geomembrane can be due to incorrect screw and die design, improper temperature distribution, and worn extruder barrels and screws.
Screw-induced machine and transverse product thickness non-uniformities are caused by impacts and are detected because they recur. A melt pump can help end thickness variations caused by poor screw design or by wear.
②.Improper sleeve temperature distribution may also cause impact, but the melt pump will not solve this problem but will cause viscosity changes and the resulting non-uniform thickness of the impermeable geomembrane in the machine direction and transverse direction.
③.The temperature distribution of the sleeve must match the melting characteristics of the resin with the screw style.
④.For specific operating conditions, the production equipment should use qualified die heads. If the die head style does not meet the operating conditions of the production strip, it is easy to have uneven product thickness.
2. Geomembrane Raw material factors
①. The uneven thickness of the anti-seepage geomembrane may be caused by the unstable temperature of the raw materials entering the feeding block and the die, as well as the instability of feeding and mixing.
②. Keeping the temperature of the melt flow stable is an important factor to ensure the thickness and size of the anti-seepage geomembrane. Melt temperature affects melt viscosity, and even viscosity changes will change the flow distribution of the material in the die, thereby changing product performance, and a set sleeve temperature can lead to equipment failure.
③. Changes in the composition of raw materials may cause changes in melt temperature and viscosity. When dealing with mixes, unstable mix ratios can cause product quality problems, so it is important to check that the mixer is set up and operating.
3. Geomembrane Process factors
Inappropriate production speed, improper human operation, and changes in the production environment will also affect the thickness of the anti-seepage geomembrane.
①. The change of screw speed affects the consistency of machine direction thickness, and at the same time the extruder can amplify any speed error in the drive system, so even speed changes can lead to serious machine direction dimensional changes.
②. Changes in production speed also affect the fluid distribution, which in turn changes the lateral performance. The use of a digital drive will end speed-induced thickness changes.
③. The change of the process parameters by the operator will interfere with the control of the thickness. By adding bus control, product thickness problems caused by operators can be reduced, the start-up time required to meet specifications is also shortened, and the bus control system can complete the anti-seepage geotechnical work better than a separate discrete controller or traditional multi-stage controller.
④. Changes in the production environment will also destroy the thickness of the anti-seepage geomembrane. Seasonal changes in temperature and humidity often have an adverse effect on the thickness of the coil; the outdoor temperature can affect the temperature of cooling water in the cooling roll; indoor temperature and airflow can change the cooling rate of the product; thin anti-seepage geomembrane Changes in airflow are particularly sensitive.
Under normal circumstances, the specifications of geomembrane are from 0.15mm to 3.0mm, so its weight per square meter is also different. In a word, the key to conversion is density.
Geomembrane thickness and weight conversion formula and calculation method
1. Thickness and weight conversion formula
Common geomembrane is divided into HDPE geomembrane and LDPE geomembrane, and the conversion of thickness and weight of geomembrane is inseparable from an important parameter, that is density. According to different raw materials, its density is also different, but regardless of the density of the two The conversion formula between thickness and weight is the same:
Geomembrane weight kg = thickness mm × density kg/m²
2. Weight of HDPE geomembrane per square meter
①. According to the national standard, the density of HDPE geomembrane should be ≥ 0.94kg/m². In actual production, the density of HDPE geomembrane produced with new materials is generally 0.96kg/m². To ensure the thickness of the product, the products it produces The weight should be:
The weight per square meter of 0.5mm HDPE geomembrane thickness is 0.5×0.96=0.48kg
The weight per square meter of 1.0mm HDPE geomembrane thickness is 1.0×0.96=0.96kg
The weight per square meter of 1.5mm HDPE geomembrane thickness is 1.5×0.96=1.44kg
The weight per square meter of 2.0mm HDPE geomembrane thickness is 2.0×0.96=1.92kg
②. If HDPE geomembrane is produced with recycled materials, and its density is generally 0.955kg/m², then the weight of recycled HDPE geomembrane should be:
The weight per square meter of 0.5mm recycled HDPE geomembrane thickness is 0.5×0.955=0.4775kg
The weight per square meter of 1.0mm recycled HDPE geomembrane thickness is 1.0×0.955=0.955kg
The weight per square meter of 1.5mm recycled HDPE geomembrane thickness is 1.5×0.955=1.4325kg
The weight per square meter of 2.0mm recycled HDPE geomembrane thickness is 2.0×0.955=1.91kg
3. Weight of LLDPE geomembrane per square meter
According to the national standard, the density of LLDPE geomembrane should be ≥ 0.925kg/m². In actual production, the density of LLDPE geomembrane is generally 0.93kg/m². To ensure the thickness of the product, the weight of the product produced should be:
The weight per square meter of 0.5mm LLDPE geomembrane thickness is 0.5×0.93=0.465kg
The weight per square meter of 1.0mm LLDPE geomembrane thickness is 1.0×0.93=0.93kg
The weight per square meter of 1.5mm LLDPE geomembrane thickness is 1.5×0.93=1.935kg
The weight per square meter of 2.0mm LLDPE geomembrane thickness is 2.0×0.93=1.86kg
For a high-quality anti-seepage geomembrane product, the manufacturer’s production equipment and technical operators have a direct impact on the quality of the product. Usually, a good product must be produced by a manufacturer with advanced equipment and high-quality talents. . Our company adopts advanced R&D, production, and construction equipment from Europe and the United States, and has cultivated various high-quality production and construction teams. Since the establishment of the company, the quality of anti-seepage geomembrane and other products has been stable and has been used in all parts of the country. You can leave a message on the website or call the customer service phone(+86 189 6341 6260) for a detailed consultation.