Extrusion casting composite film is to cast a thermoplastic onto other substrate films with a T-shaped die of an extruder, and then form a multi-level composite film after being pressed and pasted by a cooling roller. In order to improve the adhesion between the extruded plastic and the substrate film, Anchor coating agent should be coated on the substrate film.
The production process of extrusion casting lamination is as follows: the substrate film is rolled → the eye is coated with AC agent and dried, the extruder T-die is cast on PE, EVA or PP and other plastics, at the same time, the second substrate film is hot melt pressed on the press roll under the condition that the extruded plastic is the middle layer and the bonding layer, and the cooling is rolled into a three-layer structural packaging material. Extrusion casting layer method has a single stage form, as well as double stage form and multi-level form, that is, the use of two extruders or three extruders in series on a line, a time can extrude more than three layers of multi-layer composite packaging film bag is an important substrate for packaging, 5 ~ 100pm thick aluminum foil with paper composite bag box, can be used for cream, margarine, The packaging of chewing gum, fertilizer, etc. is combined with cellophane and P film, which can be used for packaging pastries and pharmaceuticals, and can also be used as a container with the packaging of PE and supplies, and its physical and mechanical properties.
