Double-side fixed point overprinting device of multilayer composite membrane, multilayer composite membrane and method for double-side fixed point overprinting device

Abstract

The embodiment of the invention discloses a double-side printing and fixed point overprinting device of a multilayer composite membrane. The device comprises a multilayer composite membrane rectifying device. The multilayer composite membrane rectifying device comprises a stretching and offset scanning mechanism, a stretching correcting mechanism and an offset correcting and scanning mechanism, wherein the stretching and offset scanning mechanism scans marks on the edges of the multilayer composite membrane and records the stretching variation; the stretching correcting mechanism comprises a correcting guide roller installed on a screw rod, and the screw rod is driven by a servo motor according to the stretching variation so as to correct variation of the multilayer composite membrane; the offset correcting and scanning mechanism detects the multilayer composite membrane again for further correction. The embodiment of the invention further discloses the multilayer composite membrane obtained through double-side printing and fixed point overprinting and an overprinting method for the double-side printing and fixed point overprinting device. By means of the double-side printing and fixed point overprinting device of the multilayer composite membrane, the multilayer composite membrane, and the overprinting method for the double-side printing and fixed point overprinting device, the stretching deformation of the multilayer composite membrane is scanned, the correcting guide roller ascends and descends in real time to correct the generated offset, and accordingly the situation that printed characters on the back face are staggered with patterns on the front face due to error accumulation caused by the offset is avoided.

Description

technical field [0001] The invention relates to a printing technology, in particular to an overprinting device on the back of a multilayer composite film, an overprinted multilayer composite film and an overprinting method. Background technique [0002] At present, in the field of packaging and printing, most of the films used for packaging are used to print various graphics on the surface, and there is no printing on the back. In the prior art, the process of double-sided printing on the film is as follows: first After printing on the surface of the film, pass the printed film through a high-temperature oven, then cool it, print the back after winding, and finally pass through a high-temperature oven, and then cool it. Stretch or shrinkage deformation In the process of positioning and printing on the back, due to the irregularity of the stretch or shrinkage, the text printed on the back will deviate after a long period of error accumulation, and due to the irregular stretch...

AI Technical Summary

Problems solved by technology

[0002] At present, in the field of packaging and printing, most of the films used for packaging are used to print various graphics on the surface, and there is no printing on the back. In the prior art, the process of double-sided printing on the film is as follows: first After printing on the surface of the film, pass the printed film through a high-temperature oven, then cool it, print the back after winding, and finally pass through a high-temperature oven, and then cool it. Stretch or shrinkage deformation In the process of positioning and printing on the back, due to the irregularity of the stretch or shrinkage, the text printed on the back will deviate after a long period of error accumulation, and due to the irregular stretch It is difficult to align the front and back printing at one time due to shrinkage or shrinkage. We can only rely on manual real-time quality inspection of the film after overprinting. When a certain amount of deviation is found, it is necessary to stop the machine to correct it, resulting in slow printing speed and unsatisfactory overprinting effect.

For a multi-layer composite film, the problem of uncertain offset is more obvious, so the existing technology has technical difficulties in positioning and printing on the back of the film

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