There are four kinds of typical structure of plastic composite hoses: 1, polyethylene ( The outer layer) / adhesive resin ( White) / ethylene vinyl alcohol/adhesive resin/PE ( The inner layer) 。 2, polyethylene ( The outer layer) / adhesive resin ( White) / polyester ( Or have the SiO, A12O3 coating etc. ) / adhesive resin A1203 / polyethylene ( The inner layer) 。 3, polyethylene/adhesive resin ( White) / polyester/adhesive resin. 4, polyethylene/adhesive resin/ethylene vinyl alcohol/adhesive resin/PE. Composite hoses with multi-layer co-extrusion hose have stitched composite hoses and multi-layer co-extrusion tube has more advantages than, but with the development of multi-layer co-extrusion technology, this kind of situation in the future there will be some changes.