1, the internal lubrication is more, the fluidity is very good, the plasticizing time is shorter, but the excess internal lubrication will be transformed into external lubrication effect, resulting in precipitation;
2, external lubrication is more, plasticizing becomes worse and slower, because of poor compatibility with PVC, more will cause serious precipitation;
3, small molecules influence of lubricant, a classic example, single lipid, itself a single gan grease lubricant inside is a kind of very good, but because of factory production process to reduce cost, add more amount of glycerol, a single lipid contains a lot of glycerin content, glycerin low molecular weight, easy to precipitate in the process of PVC processing, real nice single lipid content correctly, It will not cause precipitation, single glycerin or film materials in the antifogging agent, droplet agent.
Of course, internal and external lubrication can not be too little, to balance the internal and external lubrication. Too little internal lubrication, poor fluidity, prolonged plasticizing time, large torque. Too little external lubrication, fluid sticky, resulting in paste or gloss is not enough.
