Patent GB-433110-A (GB)
Title: Improvements in the treatment of yarns, filamentary bundles, and like textile materials
IPC: D01D10/04
Filed: 1934-10-29
Abstract: <PICT:0433110/IV/1> A process for the treatment of filaments or yarns comprises applying thereto an anti-static dressing, and spraying the dressed filaments or yarns with a coating of lubricant.  The lubricant is preferably sprayed on to the filaments or yarns by means of an air stream conveying the filaments to a staple fibre cutting device.  The anti-static dressing may be applied in a controlled quantity by one or more wicks, fabric-covered rollers, grooved or plain rollers, or discs dipping into a solution or molten bath of the material.  Suitable antistatic dressings are 100/30/6, 7 or 10 of diethylene glycol/water/magnesium chloride, or triethanolamine oleate, triethanolamine stearate with a trace of free triethanolamine, or glycol and glycerol oleates and stearates with a trace of free triethanolamine.  The antistatic dressing is applied in amounts of 2--10 per cent of the filaments. Suitable lubricants are light mineral oil (viscosity about 75 Saybolt seconds at 100 DEG F.), light mineral oil plus 10 per cent sulphonated naphthene, olive oil, ethyl oxybutyrate, diethlene glycol, glycols, glycerol, formals such as formal glycerol, or the formal of the mono-methyl ether of ethylene glycol or mixtures of two or more of these materials.  About 0,2--2 per cent of lubricant is applied to the filaments.  Lubricants which themselves have anti-static properties are fatty acids which are ionized in oils or organic solvents, emulsions of oil, water and substances such as triethanolamine lactate, tartrate, citrate or borate, or similar salts of ethylene diamine and similar amines or solutions of alkylolamine salts of fatty acids such as oleic acid in glycols or other polyhydric alcohols.  The invention is particularly applicable to yarns of cellulose, or its derivatives, to straws or foils, or to filaments which are to be wrapped round wires as an insulating covering.  Suitable apparatus for forming staple fibres from filaments treated according to the invention is shown in Fig. 1 in which the yarn or yarns 11 drawn from a dry spinning cabinet 12 by a godet roll 13 passes under a guide roll 14, and over a felted roll 16 dipping in a trough 22 of liquid 21 which may be heated at 23. The roll 16 is positively driven at slower peripheral speed than the speed of the yarn to perform a wiping action on the yarn and apply an even coating thereto.  The height of the roll 16 is adjustable.  From the roll 16 the yarn is drawn through a conduit 24 by a draught of air from a pipe 26 to an adjustable table 27 to be cut by knives 41 on a cutting wheel 42, driven by a shaft 43.  These knives are located in an enclosed casing 44 with baffles 45 and receiving boxes 46. Air from pipes 47 may further aid the conveying of the cut fibres. For treating the yarn with lubricant, a pipe 28 is inserted in the pipe 26 with its nozzle close to that of the pipe 26.  An atomizer 29 in the supply pipe 28 breaks the lubricant into small particles.  Air from the pipe 26 further atomizes the lubricant. The lubricant is stored under pressure in a container 31, and its delivery is controlled by valves 32, 33.  The air in pipe 26 is maintained at about 100 lbs. pressure and pressure in the lubricant pipe is about 40 lbs.  An oil flow regulator such as a gear pump 51 is desirable in the oil line 28.  The Specification as open to inspection under Sect. 91 includes the application by spraying of a single coating having both lubricative and anti-static properties, and also the application of separate lubricating and anti-static coatings, either or both of the coatings being applied by spraying. This subject-matter does not appear in the Specification as accepted.