Aluminum foil composite film in the process of curly or expand, and often easy to wrinkle

aluminum foil composite film as a packaging material, now commonly used in the packaging industry application is very wide, especially in food, medicine, cosmetics packaging application widely. But the aluminum foil in the process of curly or expand, often wrinkle easily.

wrinkles: product surface appear small local convex, vertical, or diagonal, one or several smooth groove tip, according to the appearance of wrinkles.

main causes: a large amount of pressure, when the rolling uneven deformation or coiling tension is not enough; Improper control of roll shape or rolling pressure is too low; Uneven thickness of billet, flatness is bad or shear wave; Winding shaft precision is not enough, the sleeve is not round; Improper control of pressing roller pressure; Shape control is not good, including roll grinding is not correct, roll shape control is not reasonable, unreasonable rolling and cutting process parameter control, incoming bad flatness and adjust the strip shape is not correct, sleeve or tube core precision is not enough.

as flatness, formed in the aluminum foil composite film winding or a fold, its essence is lack of tension makes the box surface flattening. For tension device for 20 mpa, the box surface flatness shall not be greater than 301, when more than 301, coupled to wrinkle.

due to rolling from often take than after sequence processing, the greater the tension, some just show the flatness is not good when rolling aluminum foil used in cutting or after annealing but show the corrugate.

to find out the reason of the aluminum foil composite membrane wrinkling, and it is easier to solve it.