Stripping of permanent finishes, in particular of resin finishes

For repairing purposes it is sometimes necessary to strip permanent finishes, in particular when crosslinking agents are involved.

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Depending on the chemical composition of the products and the resultant varying degree of fixation on the fibre, we distinguish between hydrolysis processes for paraffin-based hydrophobic agents, crosslinking agents (self-crosslinking products), reactants (crosslinking agents for cellulose) and silicones.

General tips for stripping treatments (hydrolysis)

For each of these groups, guide recipes have been worked to ensure an optimal removal. The following recipe suggestions are tailored to the exhaust treatment of CO piece goods with the add-on quantities at which the respective finishing agents are commonly applied.

Lower quantities will be required for the acid-sensitive regenerated cellulosic fibres, and somewhat higher quantities for instance for CO finishes with reactants, which are both tenacious and cannot be hydrolysed completely.

If a particularly sensitive material is to be stripped, the somewhat more gentle oxalic acid or, even better, formic acid will be preferred although the aggressive hydrochloric acid is surely more effective and also cheaper. If oxalic acid is used, oxalate deposits may appear on the goods - at least with very hard water. To avoid this, formic acid should be used.

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