METHOD OF MAKING MULTILAYER ARTICLE Russian patent published in 2013 - IPC B32B15/00 E04C2/28 

FIELD: process engineering.

SUBSTANCE: invention relates to production of multilayer antirust structures. Proposed article comprises, at least, one steel layer, antirust layer, foam plastic layer and layer of dried wood fibers. Proposed method comprises making work pieces, preparing panels of flaps and applying powder coating. Coiled steel is precut into strips to be leveled and stretched before coiling so that roll is placed on unwinder, steel strips are leveled, leveled strip is fed to roll mill whereat rolls deform it to required shape. Steel section is cut to work pieces of required size. Billets of article box are made from cold-rolled or hot-rolled steel and functional openings are punched in said billets. Metal surface is pretreated by dipping steel layers in baths in turns during application of paint layer in polymerisation tunnel or cyclic chamber for reliable bonding of metal with said layer. Then, said surface is washed by water. To remove oxides and rust metal surface is etched by acid for 15-30 minutes. Then, it is washed by water again. Acid etching effects are neutralised by dipping in bath for 3-5 minutes and washing by water with subsequent conditioning in bath with liquid solution. Then, phosphatising is performed to produce zinc-phosphate rustproof film. Then, painting or applying transfer coating is carried out with the help of powder polyether dye based on carboxyl-bearing saturated polyethers containing film-forming agent in amount of 50-60 wt %, pigment and filler - 35-50 wt %, other additives and admixtures making the rest. Layer of wood dried fibers are treated by synthetic binders and compacted to mat to be shaped to straps of MDF applied on inside or outside of multilayer articles.

EFFECT: higher reliability, antirust protection.

6 cl, 15 dwg