公开(公告)号：US09878347B2

公开(公告)日：2018-01-30

申请号：US14226098

申请日：2014-03-26

Applicant: Riem Service s.r.l.

Inventor： Fabio Russo

IPC: C08K3/04 ,  B05D1/02 ,  F04C2/16 ,  B05D3/02 ,  B05D3/12

CPC classification number: B05D1/02 ,  B05D3/0272 ,  B05D3/12 ,  B05D2506/15 ,  F04C2/16 ,  F04C2230/80 ,  F04C2230/85 ,  F04C2230/91

Abstract: A refurbishment process for a volumetric screw compressor of the ‘oil-free’ type, which comprises a male rotor and a female rotor, is described. The process comprises visually checking the wear condition of the rotors, treating their surface for removing the previous coating, and applying a new coating on the surface. The composition of the coating applied on the surface of the rotors consists of the following materials: MaterialAmount (g) Polytetrafluoroethylene750 ÷ 850 (954G 303 C Teflon, DuPont) Amorphous graphite powder300 ÷ 400 Thinner for spray cleaning apparatuses200 ÷ 270 (8595 thinner, DuPont) Methyl ethyl ketone (MEK)170 ÷ 220 Cellosolve acetate coating additive200 ÷ 300 (Syn Fac 800 resin).