1. Fully Automatic Laminating Machine automatic paper feeder with oil-free vacuum pump to ensure the automatic paper feeding.
2. Man- machine interface system: color touch screen, easy for operation; it realizes automatic operation after directly data input for paper size, overlap length and working speed, working status can be tracked via the screen.
3. Automatic paper feeding system equipped with photocell detector and machine automatic stops to self- protection while short of paper, dual paper or paper breaks.
4. Conveying table with air aspirator and front guide to ensure paper conveying and overlap to be stable and neat, and improve the lamination precision as well.
5. Electric-magnetic instant heating system ensures lamination temperature constantly and makes it precise while for the lamination and more easy for maintenance.
6. Automatic hydraulic system ensures the stable pressure and the lamination quality.
7. Air shaft convenient for film loading & unloading, and accurate for film release.
8. Film shaft equipped with braking device to control the tension and speed of the film.
9. The cutting unit and paper receiving unit can be easily moved away from the laminating unit, which makes the maintenance more convenient.
10. Pneumatic cutting system realizes automatic paper cutting after paper size data input.
11. The receiving table equipped for the sheet laminated paper
The basic mechanism of extrusion is simple – a screw rotates in the barrel and pushes the plastic forward. The screw is actually a bevel or slope that wraps around the center layer. The aim is to increase the pressure in order to overcome the large resistance. In the case of an extruder, there are three kinds of resistances to be overcome: the friction between the solid particles (feed) on the wall of the cylinder and the mutual friction between the coils before the rotation of the screw (feeding zone); Adhesion on the wall of the barrel; the internal flow resistance of the melt as it is pushed forward.
Most single screws are right-handed threads, like screws and bolts used in woodworking and machinery. If they look from the back, they are turning in the opposite direction because they try to spin out the barrel as far as possible. In some twin-screw extruders, the two screws rotate in opposite directions in two cylinders and cross each other, so one must be right-handed and the other must be left-handed. In other occlusal twin screws, the two screws rotate in the same direction and must have the same orientation. However, in either case, there is a thrust bearing that absorbs the backward force, and Newton's principle still applies.
2. Thermal principle
The extrudable plastics are thermoplastics - they melt when heated and solidify again upon cooling. Where does the heat of molten plastic come from? Feed preheating and barrel/die heaters may work and are important at start-up, however, the motor input energy - the friction of the motor against the viscous melt - the frictional heat generated in the barrel when turning the screw - is all The most important heat source for plastics, except for small systems, low speed screws, high melt temperature plastics and extrusion coating applications.
For all other operations, it is important to recognize that the barrel heater is not the primary source of heat in operation, and therefore the effect on extrusion is less than we expected (see Principle 11). The post-cylinder temperature may still be important because it affects the rate of solids transport in the teeth or in the feed. The die and mold temperatures should generally be the desired melt temperature or close to this temperature unless they are used for a specific purpose like glazing, fluid distribution or pressure control.