HDPE (high-density polyethylene) film welding method in refuse landfill

A landfill and welding method technology, applied in the field of HDPE film welding, can solve welding quality problems and other problems, and achieve the effect of not easy to crack and good laying effect

Active Publication Date: 2014-05-21
中城建胜义(深圳)环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When welding HDPE membranes, if there is a temperature difference between adjacent HDPE membranes, it will affect the welding quality, but this influencing factor is often ignored or not known, resulting in welding quality problems

Method used

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  • HDPE (high-density polyethylene) film welding method in refuse landfill
  • HDPE (high-density polyethylene) film welding method in refuse landfill
  • HDPE (high-density polyethylene) film welding method in refuse landfill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In winter, lay a 1.5mm thick glossy HDPE film, and laminate 50mm between the films; let it air for 1 hour; take two small pieces of 1.5mm thick smooth HDPE film with a size of 30cm×30cm, laminate 50mm, and use Swiss LEISTER The double-track hot-melt welding machine manufactured by the company uses the existing hot wedge double-track welding method. The welding speed is 2.2m / min, the welding temperature is 430°C, and the ejector pin pressure is 800N. The film is pulled to both sides, and there is no phenomenon of disengagement or tearing. The welding speed of 2.2m / min, the welding temperature of 430°C, and the pressure of the ejector pin of 800N are used to weld the 1.5mm thick smooth HDPE film laid as a whole. Finally, the existing technology is used to pressurize and ventilate the empty groove in the two welds to detect the continuity of the welding, and there is no air leakage. load.

Embodiment 2

[0054] In summer, lay a 1.5mm thick glossy HDPE film, and laminate 50mm between the films; let it air for 1 hour; take two small pieces of 1.5mm thick smooth HDPE film with a size of 30cm×30cm, laminate 50mm, and use Swiss LEISTER The double-track hot-melt welding machine manufactured by the company uses the existing hot wedge double-track welding method. The welding speed is 2.8m / min, the welding temperature is 410°C, and the ejector pin pressure is 750N. The film is pulled to both sides, and there is no phenomenon of disengagement or tearing. The welding speed of 2.8m / min, the welding temperature of 410°C, and the pressure of the ejector pin of 750N are used to weld the 1.5mm thick smooth HDPE film laid as a whole. Finally, the existing technology is used to pressurize and ventilate the empty groove in the two welds to detect the continuity of the welding, and there is no air leakage. load.

Embodiment 3

[0056] In summer, lay a 1.5mm thick glossy HDPE film, and laminate 50mm between the films; let it air for 1 hour; take two small pieces of 1.5mm thick smooth HDPE film with a size of 30cm×30cm, laminate 50mm, and use Swiss LEISTER The double-track hot-melt welding machine manufactured by the company uses the existing hot wedge double-track welding method;

[0057] First, the welding speed is 2.8m / min, the welding temperature is 410°C, and the pressure of the ejector pin is 750N. Conduct a test welding, and pull the small piece of HDPE film welded to both sides, and there is a slight disengagement and tearing phenomenon;

[0058] Continue to take two small pieces of glossy HDPE film with a size of 30cm×30cm, laminate them with a thickness of 50mm, adjust the welding speed to 2.4m / min, the welding temperature to 425°C, and the ejector pin pressure to 760N for trial welding. The small piece of HDPE film is pulled to both sides, and there is no detachment or tearing phenomenon;

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Abstract

The invention discloses a HDPE (high-density polyethylene) film welding method in a refuse landfill. After the welding method is adopted, a film is smooth in surface and hard to tear off. The HDPE film welding method in the refuse landfill comprises the following steps: laying HDPE films, wherein the lamination space between the adjacent films is not less than 50mm, standing for 1 hour after laying, test-welding by a small film made from the same material of the laid films, testing the test-welded film, adjusting parameters of a welder according to the result, repeating the test-welding until the test-welded film is qualified, and welding the integral HDPE film according to the adjusted parameters obtained through test-welding. Compared with the prior art, the film welding method has the advantages that the temperature difference between two laminated films can be prevented in welding after the laid HDPE film is aired for a certain time before welding, and the reasonable welder parameters are selected for welding according to the test-welding result, so that the welded film has a good laying effect and is unlikely to crack.

Description

technical field [0001] The invention relates to an installation method of an anti-seepage system in a landfill site, in particular to a HDPE film welding method. Background technique [0002] HDPE film (high-density polyethylene film) is the most widely used anti-seepage geomembrane material for landfills. It has high mechanical strength, strong resistance to ultraviolet rays, ozone and climate factors, and is not easy to age. It has good working characteristics, good resistance to chemicals and acids, and good anti-seepage performance. Therefore, its role in the anti-seepage system of landfills is to isolate the upper pollutants and the lower surface with its own impermeability. At the same time, it bears pressure with its high tensile strength and elongation to adapt to and get close to the ground surface. The welding of HDPE membrane is the key process of anti-seepage system construction. The welding quality is the key control point of the whole project quality. During th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C65/02
Inventor 不公告发明人
Owner 中城建胜义(深圳)环境科技有限公司
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