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Coating equipment coating film laminating machine and pre coated laminating machine two categories. The posive overlaid machine wide range of application, processing performance is stable and reliable, is widely used in coating equipment. Pre coated laminating machine, no adhesive and drying part, small volume, low cost, flexible and convenient operation, not only for the film processing large quantities of printed matter, but also for automation desktop office system, scattered small batch print film processing. At present, China has produced by computer controlled advanced pre coated laminating machine.

Pre coated laminating machine has wide application prospect and popularization value, is the development direction of laminating machine. However, the pre coated plastic film and other conditions, China now still rarely used.

The sensitibvity membrane equipment

The posive overlaid machine will roll film coated adhesive after drying, using special equipment pressure composite parts and printed composite together. Namely, Xu type laminating machine has automatic and semi automatic machine two. Different types of models in the structure, the film covering technology has one's own knack in, but the basic structure and working principle is the same, mainly by the tape, adhesive coating, drying, composite, winding five parts and mechanical transmission, automatic tension control, automatic deviation and other affiliated unreeling device.

The 1 part put volume. Plastic film unreeling operation films always maintain constant tension. Tension is too large, easy to produce longitudinally corrugated marsh, otherwise easy to generate cross corrugated composite lattice, are not conducive to the adhesive coating and printing. In order to maintain the proper tension, unreeling part is generally equipped with tension control device, common mechanical friction disc clutch, AC motor, magnetic powder clutch torque.

2 glue coating part. A film unreeling after coating roll into the plastic parts. The coating forms: drum reversing, concave, no direct glue scraper and scraper directly gluing.

(1) the drum reversing. Belong to indirect glue, the machine adopts a most. The structure shown in figure 113. For cots with glue from plastic storage tank, scraping, scraping plate roller allows excess glue to scrap plastic storage tank. Thin film anti roll will be coated film pressure to the cots surface evenly gluing, and maintain a contact area, the glue liquid pressure and adhesive force continuously coated on the surface of the films. Amount of glue can be changed by adjusting roller and glue roller scraping, scraping roller and plate between the distance.

(2) the concave type coating. By a surface with textured metal coating roller and a group of film partition rollers, see figure 114. Cots direct immersion glue, with the roll from the storage tank will be brought out by the glue, scraper to remove the redundant glue roller surface. In the film roll, glue roller groove by the coated film directional movement and uniformly Xu deposited on surface of the film. Through characteristic adjusting coating roller surface grid reticulate, adhesive, lamination roller pressure to control the amount of glue.

Advantages of concave type glue is able to accurately control the amount of glue, coating uniform; but the roller processing difficulties, easily damaged, need regular cleaning, higher requirements on the adhesive and coating.

(3) no doctor roll extrusion coating. Cots direct immersion glue, coating, coating roller with a glue homogenizing roller coating by post, finish coating by extrusion lamination roller and glue roller.

Extrusion, pressure, adhesive properties and coating speed decided to layer thickness. Gelatinize through extrusion pressure regulation between the cots and homogenizing roller, glue roller and lamination roller realization. Therefore, there are higher on the roll surface precision runout, cylindrical and radial requirements.

(4) a direct glue scraper. Cots direct immersion glue, and constantly rotating, the glue from the gum trough, the scraper to remove the excess glue, with the film surface contact finish coating.

A scraper directly coating method, in the design requirements of the scraper to glue the spatula cots surface, which requires scraping knife edge straightness, cots surface with high precision.

Scraping knife is made of high flatness, smoothness and good elasticity stainless steel band.

Drying part 3. A large amount of solvent coating on the adhesive coated plastic film surface contains, a certain fluidity, compound must be processed by the drying. Drying part of the tunnel type, according to type of different drying path length between 1.5 ~ 5.5m. According to the solvent volatilization mechanism, drying design into three zones:

(1) the evaporation zone. The area should be as far as possible, forming turbulent wind on the surface of the films, and solvent evaporation.

(2) curing area. According to the set of film, adhesive properties of automatic temperature control, general control in 50 ~ 80 ℃, heating with infrared heating, electric heating pipe direct radiation heating, automatic balance temperature control by mounting thermal in curing area sensing element to realize.

(3) the solvent exclusion zone. For the timely elimination of adhesive in the volatile solvent, reduce the drying of vapor pressure, the design of exhaust gas extraction device, generally a fan or blower etc..