Home > News > New plastic material sealed timber modality
New plastic material sealed timber modality - 2013-09-09 02:11:37
Fluorine plastic gasket with polytetrafluoroethylene (PTFE) as the main material of the gasket in the domestic production of two categories of products , namely pure PTFE gasket, two are modified PTFE gasket. Pure PTFE gasket can be molded directly produced or from PTFE plate ( rod ) cutting ( turning ) from. PTFE sheet molding process is divided into different according to their molded plates and cutting boards . Molded plate flatness, but the basic fabric for manual operation resulted in uneven density , and by PTFE resin molding pressure higher than the impact ( need large tonnage presses molding ) , in sizes up to 1500mm × 1500mm.
Coupled with non- PTFE welding , limiting the size of these pads in the use of large size . Turning plate can exceed the width 2000mm, length up to 50m or more, relatively uniform density , but due to its processing of the material is curled type gasket is not conducive to large cutting and installation. http://www.lfcwgs.com
PTFE modified PTFE gasket is added to the resin in a certain proportion of functional materials to improve the inadequate performance of pure PTFE , such as to improve the thermal conductivity of graphite is added , adding glass fibers to improve its strength, adding copper to improve its hardness, added to improve PHB its temperature stability , these products for a number of small size directly molded sealing element .
Expanded PTFE sealing products in the domestic production of a late start, and technically with foreign products still lags behind . There are nearly 10 domestic enterprises in the production PTFE joint sealant tape ( strip gasket ) , but most products are not sealing industry manufacturers , the product simply have " bulked " function , the seal requirements good compression elasticity , tensile strength, surface hardness, low stress relaxation rate function indicators does not attach directly affect the product's use and economic efficiency of enterprises . And with multi-directional fiber and closed pore structure of expanded polytetrafluoroethylene sheet production in our country is still blank .
Packing filler with fluorine plastic products used with stuffing machines, pumps, valves and other parts , mainly as a seal . Fluoroplastics in a filler application is divided into three kinds of forms : ① as a structural cable ( or fiber ) for braided packing ( packing ) , has pure PTFE packing , oil PTFE packing, graphite-filled PTFE packing , PTFE packing separate wire and so on. Typically this type of packing can be used in the chemical medium conditions , be able to withstand a certain line speed and pressure , but due to poor thermal conductivity of PTFE , structural strength of the line is also unsatisfactory . Result in the use of rotating or reciprocating pumps , because of frictional heat is difficult to pass out stuffing the formation of " axle ", so that the device generates power to increase or seal failure .