Film coating equipment and using skills (2)

(2) Mature area. The automatic temperature control zone is set according to the nature of the film and adhesive. Generally, it is controlled at 50-80°C. The heating method includes infrared heating and direct radiant heating of the electric heating tube. The automatic balance temperature control is realized by the heat sensitive element installed in the curing zone.

(3) Solvent exclusion zone. In order to eliminate the solvent evaporated in the adhesive drying and reduce the vapor pressure in the drying path, an exhaust air extraction device is designed in this area, which is usually a fan or an induced draft fan.

4. Composite section. Mainly by the chrome hot roller, rubber pressure roller and pressure adjustment machinery and other components.

(1) Heat roller. The hot-press roller is a hollow roller and has an electric heating device. The temperature of the roller is controlled by the sensors and the instrumentation of the console. The surface condition and thermal power density of the hot press roll have a great influence on the quality of the coated product. The general lamination process requires a hot pressing temperature of 60-80°C and an area heat flow of 2.5-4.5W/cm2.

(2) Rubber pressure roller. The coated product is pressed against the hot roller with a certain pressure to make it solid and stick. The contact pressure during compounding is closely related to the bonding strength and appearance quality, and is generally 15.0 to 25.0 mPa. The rubber pressure roller works at a high temperature for a long time, and also needs to keep the roller surface flat, smooth, small in transverse deformation, good in tear resistance and peelability, and therefore, silicone rubber having better tear resistance is used. ,

(3) Pressure adjustment mechanism. Used to adjust the pressure between the heat roller and the rubber pressure roller. The pressure adjustment mechanism may employ a simple eccentric mechanism, an eccentric cam mechanism, a screw rod, a nut mechanism, etc.; however, in order to simplify the mechanical transmission components and improve the pressure control accuracy, most currently use a liquid (gas) pressure type pressure adjustment mechanism.

5. Print input section. There are manual and automatic input methods for the transport of printed materials. Automatic input method is divided into two types: pneumatic and friction. Pneumatic is to install a row of suction nozzles at the front or tail of the prints, relying on the suction, release, and movement of the suction nozzles to separate and deliver the prints. Frictional input mainly relies on the reciprocating movement or fixed rotation of the friction head to generate friction with the printed matter. The printed matter is separated from the paper storage table and conveyed forward; the friction wheel rotates intermittently and unidirectionally, and one print is separated for each rotation.

6. Winding section. The laminating machine mostly uses an automatic winding mechanism, and the take-up reel can automatically take the compounded product into a roll shape. In order to ensure the tightness of the winding, the speed of the reel and the composite line must be synchronized, and the tension should be kept constant during rewinding. As the winding diameter increases, its linear velocity must continue to be synchronized with the composite linear velocity. In general, the machine uses friction damping to change the angular velocity value of the take-up reel to meet the above requirement. In order to increase work efficiency, some laminating machines are also equipped with quick unwinding and finished product slitting devices in the winding section.

Pre-coated membrane equipment

The precoat laminator is a special device that combines prints with precoated plastics. Compared with the coating type laminating machine, the biggest feature is that there is no coating and drying part on the coating. Therefore, this type of laminating machine has a compact structure, a small volume, a low manufacturing cost, an easy operation, and a good product quality stability.

Pre-coated laminating machine is composed of pre-coated plastic film unwinding, automatic input of printed matter, hot-pressing zone compounding, automatic winding, and mechanical drive, pre-coated plastic film flattening, longitudinal and transverse slitting, computer control system And other auxiliary devices.

1. Print input section. The automatic conveying mechanism can ensure that the prints do not overlap and enter the compound part at equal intervals in the transmission. Generally, pneumatic or frictional methods are used to realize the control, and the conveying accuracy and precision are high. In the case of prints with small composite webs, the above requirements can also be satisfied.

2. Compound part. Including composite roller group and calender roller group. The composite roller set is composed of a heating pressure roller and a silicone pressure roller; the heat pressure roller is a hollow roller and is internally provided with a heating device; the surface is forged with hard chrome and polished and finely ground; the hot roller temperature is tracked by a sensor, and the computer Correct at any time; compound pressure adjustment using eccentric cam mechanism, pressure can be adjusted steplessly, the principle of the schematic, such as the calender roller group and the composite roller group is basically the same, that is composed of chrome plated pressure roller and silicone pressure roller, but no heating device. The main function of the calender roll group is: After pre-coating the plastic film with the printed product, the surface brightness is not high after being compounded with the composite roll group, and then the second roll extrusion of the calender roll group greatly increases the surface brightness and adhesive strength.

3. Transmission system. The drive system is driven by a computer-controlled high-power stepper motor. After the first gear is decelerated, the three-stage chain drive drives the movement of the paper feed mechanism and the rotation of the composite part and the silicone pressure roller of the calender mechanism. The pressure roller set maintains the proper working pressure under steplessly adjusted pressure.

4. Computer control system. The computer control system uses a microprocessor, and the hardware configuration consists of a main board, a digital key board, an optical isolation board, a power board, and a stepper motor power driver board.