Naoharu Oyabu, printing consultant

Printing consultant Mr. Naoharu Oyabu.

Resist printing without use of tin chloride
All disperse dyes are applicable

According to Mr. Oyabu, 'Resist printing on polyester, in which commonly-used azoic and quinon type non-dischargeable dyes can be applied without difficulty, is now in the offing. All kinds of disperse dyes are applicable, and the printing can be carried out through the wet-on-wet direct method.

'Through cooperation with printing factories in Indonesia, the testing has advanced close to the potential implementation of the method. Further testing should be carried out from every angle to find out whether it can be practically used at the work front in printing factories.

Mr. Oyabu continues, 'The special feature of the resist printing through the wet-on-wet direct method tested in 3 Indonesian factories is that no printing paste made with tin chloride or alkali is required in the process. If this method is implemented, it will widen the range of applicable dyes, as well as contributing to the protection of the environment by using no tin chloride. Consecutive testing will be necessary to see if this resist printing by the direct method can be put into practice.'

The outline of the procedure tested is as follows.

A polyester cloth upon which resist printing paste is placed is first ground-printed through the wet-on-wet method, then steamed and washed. 'The most efficient will be through the rotary screen printing method', he added.

The key to the implementation of this method seems to be in the development of new resist printing pastes.

Printed polyester used in the testing of the resist printing method, in which all kinds of disperse dyes are applicable.