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PVC Welding

cat February 3rd, 2012 by Virtual Keeper

Welding film – is the basic approach of polyethylene compounds. Welding of PVC – a technology for permanent connection with diffusion bonding or chemical welding of geomembranes, resulting in a junction between the joined surfaces of polyethylene film disappears and turns the transition from one part to another. Plastic film is characterized by high heat and very low thermal conductivity. Therefore, welding of polyethylene the film is carried out at temperatures at which the plastic film is a plastic. The quality of the seam, which is obtained by plastic welding, depending on its composition, conditions of the welding process. Of large amount of welding of polyethylene is most often used is the thermal contact welding.

Contact-welding heat – it's fairly simple and low-cost method, which ensures a fairly high characteristics of compounds of polyethylene films. At the moment, the most common and well-welded contact and heat welding are PP (polypropylene), LDPE (low-pressure polyethylene), LDPE (polyethylene high blood pressure). These materials are characterized by relatively low temperature fluidity (125-170 C), a large temperature range of visco-fluid state (above 55 C), a rather low melt viscosity. Therefore, HDPE, PP, LDPE refer to polymers that are well welded. When welding PVC heater could come into contact with the inner surfaces as well as with external (fusion welding and weld penetration, respectively). Welding geomembrane thickness of 150 microns is obtained by the best technology, supply of thermal energy from one side. Welding of the film pressure of 25-100 microns thick film takes place at about 210 C and the tool length contact 0, 5-0, 6 seconds. Welding of low pressure polypropylene film thickness of 25-100 microns is conducted at a temperature of 240 C and a tool contact time 0, 55-0, 68 seconds. Welding of polyethylene film thickness of 25-100 microns is carried out at tool temperature 240 C and a contact time of 0, 6-0, 75 seconds.

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