Knowledge of Chemical Sheet It is used under the heel of the shoe to make the heel play a role of fixation. The material used is a bit like cardboard, which is relatively hard, but it will be used when fixing port treasure and shoes.  

Also known as: tablecloth, because of the habit is covered at the table, so also called tablecloth.

Spraying collodion principle of structure formation is to spray adhesive on both sides of the fluffy fiber layer, because you have a certain amount of pressure on spray, and the lower vacuum suction fluid, so in the interior of the fibre layer also c...