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What is the reaction of composite geomembrane affected by temperature

Release time：

2023-02-02 10:27

The creep of 　　 composite geomembrane is greatly affected by temperature changes, according to the creep law under low-temperature creep and freeze-thaw cycles. The creep value decreases with the decrease of ambient temperature, and tends to a stable law.

　　 When the creep at room temperature has stabilized, the concept of the influence factor DR of the freeze-thaw cycle is proposed. During the freeze-thaw cycle, the creep value increases during the heating stage. And get the calculation method of creep influence coefficient FcR at low temperature.

　　In terms of engineering cost, the use of composite geomembrane as an impermeable base material is more than one-half lower than the base-level gravel filter. Preventing river pollution and soil erosion can play a role in protecting the environment.

　　 The temperature should generally be above 5 degrees Celsius. When the temperature is too low, the construction should not be carried out in strong winds above grade 4, rain or snow. The composite geomembrane will be tense at low temperatures, and the geomembrane should be relaxed at high temperatures.

Pre

The market share of polypropylene spunbond non-woven fabrics

How to determine if the composite geomembrane meets the standards

Pre

The market share of polypropylene spunbond non-woven fabrics

How to determine if the composite geomembrane meets the standards

What is the reaction of composite geomembrane affected by temperature

2021-09-15

When the composite geomembrane is used, what are the effects of temperature and how the temperature reacts to the composite geomembrane? As a composite geomembrane manufacturer in Shandong, let the editor and everyone have a detailed understanding! The creep of 　　 composite geomembrane is greatly affected by temperature changes, according to the creep law under low-temperature creep and freeze-thaw cycles. The creep value decreases with the decrease of ambient temperature, and tends to a stable law. 　　 When the creep at room temperature has stabilized, the concept of the influence factor DR of the freeze-thaw cycle is proposed. During the freeze-thaw cycle, the creep value increases during the heating stage. And get the calculation method of creep influence coefficient FcR at low temperature. 　　In terms of engineering cost, the use of composite geomembrane as an impermeable base material is more than one-half lower than the base-level gravel filter. Preventing river pollution and soil erosion can play a role in protecting the environment. 　　 The temperature should generally be above 5 degrees Celsius. When the temperature is too low, the construction should not be carried out in strong winds above grade 4, rain or snow. The composite geomembrane will be tense at low temperatures, and the geomembrane should be relaxed at high temperatures.

How to determine if the composite geomembrane meets the standards

2021-09-15

Looking at the solidity of the additional layer of the complex part of the composite geomembrane, during the construction of the protective layer, it is necessary to ensure the adhesion area and adhesion strength of the waterproof membrane to ensure the quality of the project. The surface needs to be coated with oily adhesive to ensure the adhesion area. During construction, fabrics and other building materials have a great influence on the hydraulic conductivity of the composite geomembrane. No heavy objects should be placed on the composite geomembrane to avoid damage to the material, but the pressure it can withstand determines its hydraulic conductivity. An important indicator of 　　 Before welding, adjust the two sides of the PE single membrane at the joint. When welding, the welded composite geomembrane should be welded by a special welding machine. To adjust the temperature and speed, it can also be glued.

Features and advantages of non-woven fabrics

2021-09-15

The important reason for the rapid development of the spunbond method is that it uses synthetic polymers as raw materials. The method uses the principle of chemical fiber spinning to make continuous filaments in the polymer spinning process. After spinning, they are directly bonded to form a net. Non-woven fabrics have a very simple and fast manufacturing method. Compared with dry-laid non-woven fabric processing technology, a series of tedious intermediate processes such as fiber crimping, cutting, packaging, transportation, mixing, and carding are eliminated. This continuous and large The most significant effect of mass production is to reduce the cost of spunbond products, stabilize their quality, and have strong market competitiveness. They can enter the textile, paper and film markets in various applications such as disposable and durable. Secondly, because spunbond non-woven fabrics use polypropylene as the main raw material in large quantities, its many advantages in terms of price, processing, and production costs have also greatly promoted the sustainable development of the spunbonded non-woven fabric industry. In addition, spunbond non-woven fabrics have excellent mechanical properties, and their tensile strength, elongation at break, tear strength and other indicators are better than dry, wet, and melt-blown non-woven fabrics, especially in recent years. The rapid development in production line scale, technology and equipment, and product market development has greatly expanded the application fields of spunbond non-woven fabrics. The biggest difference between the spunbond production process and chemical fiber spinning is the use of air drafting and direct web formation. Therefore, the drafting of the spunbond method has become the core technical problem. The previous drafting method is based on mechanical drafting. Coarse, uneven laying. At present, spunbond production equipment in the world has adopted air drafting technology. Due to the different air drafting methods, there are three different forms of spunbond production lines, namely tubular drafting, wide-slit drafting, and narrow-slit drafting. Stretch and wait. Spunbond non-woven fabric technology has always been to improve the capacity of the production line and solve the problems of non-woven fabric uniformity, covering, rough hand feeling, etc., to improve the strength, softness, uniformity and comfort of spunbond non-woven fabric , Hygroscopicity and other properties. 　　The fine densified spunbond non-woven fabric can directly improve the softness and comfort of the spunbond non-woven fabric. However, the thinning of the spunbond method has technical bottlenecks. For example, thinning can increase the number of fibers per unit area of the spunbond non-woven fabric, and the "bonding points" between fibers and fibers will increase. Products will become more uniform and coverage will increase.

The market share of polypropylene spunbond non-woven fabrics

2021-09-15

Polypropylene spunbond non-woven fabric is a kind of non-woven fabric, which is made of polypropylene as a raw material, polymerized into a net through high temperature drawing, and then bonded into a fabric by hot rolling. Due to the simple process flow and large output, it is non-toxic and harmless to the human body. So it is widely used in various fields such as sanitary materials. 　　 In the non-woven fabric manufacturing method, because the spunbond method has obvious advantages in manufacturing technology, product performance and production efficiency, it has achieved rapid development that has attracted worldwide attention in the past 20 years. At present, about 40% to 50% of non-woven fabric production adopts melt spinning method (including spunbond method, melt blown method and the composite method of the two). The melt spinning method is used in the total output of various regions. The proportions are 50% in the United States, 37% in Europe and 41% in Japan. According to the data, it can be seen that advanced countries use melt spinning as the main production method of non-woven fabrics. In North America, the most developed region in 1998, the market for spunbond non-woven fabrics accounted for 54% of the total non-woven fabric market.

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