Formulering och provning av en ny typ av sågkedjeolja
Formulation and testing of a new type of chainsaw lubricantThe company Agro Oil has come up with the idea of developing an environmentally adapted chainsaw lubricant with a new unusual base fluid. A field test with a tree-harvester shows unsatisfactory low temperature properties and high wear. In this work the viscosity, price and pour point of different combinations of the given base fluid and three other base fluids have been investigated. Desired viscosity and price are determined for different formulations. The new lubricants tested show lower pour points than almost all products on the Swedish market.A test equipment has been developed to investigate the wear. Not only wear has been studied, but also friction and the ability of the lubricant to stay in the system without new being applied. Three new lubricants have been tested. Most chainsaw lubricants on the market are based on either mineral oil or rapeseed oil, one of each has been used as reference. Overall the rapeseed based lubricant shows best test results. None of the new formulations can compete with the two reference lubricants. During testing in the steady state there is boundary lubrication and the coefficient of friction is around 0.1. The tests show fairly large variation in test results which is believed to depend on the surface of the chain and the running-in time.