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1 Materials: PVA (polyvinyl alcohol), strong in adhesion and flexible in film, provides colloid protective and gas isolation, which is now widely used in food, paper, printing and other industries. PVA is a non-toxic, tasteless, and non-polluting material. It can be dissolved in water of 80-90 degrees. The solution is good in adhesion and film-forming.
2 Technology: the application of tactile technology for Braille books can form a variety of bump design
Guangdong Industry Technical College
Guangzhou City, No. 152 Xingang West Road, China