Show how cellophane Is made from spruce wood PUI pulp the first step in the manufacture of cellophane la Is steeping sheets of cl pure spruce woo d pulp in a caustic soda solution this converts the pulp sheets into alkali cellulose the sheets are then dumped into hoppers leading to shredding machines alter after shredding the cebu lo 10 lose 0 o Is white and fluffy and looks like bread crumbs carbon bhide is then added changing the eel cal crumbs into an orange color th this Is Is dissolve dIn dlin another caustic acid solution and forms alcose which ripens under care carefully funy con trolled strolled conditions then it goes to a casting machine where in an acid bath it is coagulated from all a liquid quid into a solid film and then it rolls along through one bath after another becoming progressively purer more transparent tougher and more pliable then it goes through heavy squeeze rolls which press out all the liquid then it is wound on alcore acore as the finished product |