Soft bag gravure printing machine and paper, cardboard gravure printing machine

Due to the different printing materials, the flexible packaging gravure printing machine has its own structural characteristics compared with the paper/cardboard packaging gravure printing machine.

1. The gravure packaging gravure printing machine adopts the "volume-volume" configuration type. There are three specific configuration types:

A. Unwinding - Printing - Rewinding

B. Unwinding - Printing - Coating/Composite - Rewinding

C. Double unwinding - printing - double winding (tandem structure)

Obviously, the configuration is simpler than the paper/cardboard package gravure printer. The connection processing configuration is completely different from the paper gravure printing machine, mainly coating, compounding, etc., and will not use the unit of cross-cutting, wire-cutting and die-cutting.

2. Due to the small thickness of the material, the diameter of the general placement/winding is not large, so the structure can be more compact. Sometimes the take-up and take-up diameters can be very small (eg no more than 600 mm), the take-up reel can be on the same unit as the input section, and the output section can be on the same unit as the take-up reel

3. Due to the small thickness of the material, only the lap joint method is adopted for the material tape transfer, instead of the docking method.

4. The pretreatment device is different from the pretreatment device on the gravure printing machine. As the film material's efficency is not as good as that of the paper material, the surface treatment of the material is one of the important factors for successful printing. Therefore, the following pretreatment system is often installed at the outlet of the unwinding section: corona treater and preheated roll (pretreatment roll). The pretreatment on the paper gravure press is usually dusting, flattening, and temperature and humidity treatment (drum, single-sided or double-sided pretreatment box).

5, because most of the stretch material, so the whole machine tension is small, and the tension control system's accuracy, sensitivity, stability than the general paper gravure press requirements. In particular, a very high-precision tension control system is required for the unwinding portion and the input portion, so that the tape before entering the first printing unit is in a very stable state. At the same time tension testing must use a larger floating roller.

6, because most of the material is stretchable material, the layout of the material routing should be more stringent (including the distance between the two embossing points, tape wrap angle, etc.) The transition roller diameter is smaller; for the possible use of aluminum foil concave In printers, special consideration must be given to the structure of the transition rolls. Light rollers are usually required and the path is shortened as much as possible.

7. Because the tension is small, the tape guide generally does not require the use of a hydraulic drive mechanism.

8. Since some flexible packaging materials are heat-sensitive materials, special attention must be paid to the design of drying and cooling systems.

9. Because the surface is smooth and fine level reproduction is better, electrostatic assisted ink removal (ESA) systems are generally not used. Although some gravure-pack gravure presses also install such devices, they are mainly aimed at special products and may be printed on paper.

10. Since most materials are transparent films, tape guides generally do not use photoelectric sensors but use pneumatic or ultrasonic sensors. For the same reason, registration plates, image viewer systems, etc. need to be equipped with reflectors.

11. Due to the smaller embossing force and tension, the width of the machine is generally larger than that of paper and cardboard gravure printing machines; the use of sleeve type plate cylinders is more than that of paper gravure printing machines.

12. As reverse printing and coating are more common, two-way unwinding/cross-linking papers and front and back printing units are more common.