Packing articles using printed heat shrinkable film - by placing protective masks over printed areas during shrinking to prevent distortion
Реферат: Articles are wrapped in heat shrinkable film for packing and placed on a conveyor. The printed areas on the film are screened by protective masks which are part of the conveyor or fitted individually. Masks do not need to touch the film. Packages are passed through a heating tunnel. The protected areas, shielded from the heat, undergo minor shrinkage only. After leaving this tunnel, the masks are removed and the packages pass through a second heating tunnel of lower intensity. This removes the wrinkles and stresses between the protected and unprotected ares. The printing is unaffected by distortion.
Process for preparing heat shrinkable polyethylene film
Номер патента: CA1294101C. Автор: Yoshihiro Sakamoto,Tomoji Mizutani,Hideo Isozaki. Владелец: Kohjin Holdings Co Ltd. Дата публикации: 1992-01-14.