Tape scouring machine

For worsted yams, scouring can be conducted at a maximum temperature of 60 C for 30 min with 1 g/1 non-ionic detergent and 0.5 ml/1 acetic acid (80%). Woollen spun yams lubricated with oleine are scoured at 30 C with soap or synthetic detergent and sodium carbonate. The addition of solvent is sometimes advantageous for the removal of oils. Tape scouring machines are generally used for the scouring of hanks. 

Woollen and worsted yams, unless dry spun contain significant amount of lubricating oil and are usually scoured in hank form in a continuous scouring machine. The hanks are transported through the scouring sets either by tape (Fig. 5-21) system or by battrices (Fig. 5-22). Usually, the sets have four bowls two scour bowls, one rinse bowl and a final bowl where acidification and moth proofing is carried out. There is a pair of squeeze roller between each bowl. The top roller is usually lapped with wool or cotton sliver and the bottom roller is made of metal. Pressure is applied to have an expression of about 60%. The characteristic features of the two types of machines are summerised in Table 5.2. It is normal to scour only 1-2... 

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