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CN-116160762-B - Printing machine

CN116160762BCN 116160762 BCN116160762 BCN 116160762BCN-116160762-B

Abstract

A printing machine comprising a propulsion device for propelling a sheet-like form of material (2) to be printed, which propulsion device is provided with at least a traction roller (3) rotatable about its own axis and designed to receive the sheet-like form of material (2) to be printed at an entry zone (4) and to convey it towards an exit zone (5) for exiting the sheet-like form of material from the traction roller (3), said exit zone being circumferentially spaced from the entry zone (4) along the direction of rotation of the traction roller (2) about its own axis. The simulated printing station (6) is arranged around the traction cylinder (3) between the entry area (4) and the exit area (5). The printer further comprises a conveyor (7) between at least two simulated printing stations (6) for conveying the material (2) to be printed in sheet form arriving from the traction cylinder (3) along a thrust path having at least one thrust portion (8) extending substantially straight for thrust of the material (2) to be printed in sheet form, at least one digital printing station (9) being arranged along the at least one thrust portion.

Inventors

  • BICEGO ALESSANDRO
  • PERTILE AGOSTINO

Assignees

  • 优泰克加工股份公司

Dates

Publication Date
20260505
Application Date
20220927
Priority Date
20210928

Claims (16)

  1. 1. A printing machine comprising advancing means for advancing a sheet-like form of material (2) to be printed, said advancing means being provided with at least a traction cylinder (3) rotatable about its own axis and designed to receive the sheet-like form of material (2) to be printed at an entry area (4) and to convey it towards an exit area (5) for the sheet-like form of material (2) to be printed exiting from the traction cylinder (3), said exit area being circumferentially spaced from the entry area (4) along the direction of rotation of the traction cylinder (3) about its own axis, a simulated printing station (6) being arranged between the entry area (4) and the exit area (5) about the traction cylinder (3), characterized in that it further comprises conveying means (7) between at least two of the simulated printing stations (6) for conveying the sheet-like form of material (2) to be printed arriving from the traction cylinder (3) along an advancing path having at least one advancing portion (8) extending substantially straight, said at least one leg (8) being arranged along at least one of the printing stations (8) and at least one number of advancing portions (10) being arranged along the at least one of the printing stations (8), the at least one outward leg extends from the traction roller (3) to at least one redirecting assembly (11) for redirecting the sheet-form material (2) to be printed, the at least one inward leg extending from the redirecting assembly (11) to the traction roller (3).
  2. 2. Printer according to claim 1, characterized in that said at least one pushing portion (8) extending substantially straight is defined along said at least one outward leg (10).
  3. 3. Printer according to claim 1, characterized in that said at least one pushing portion (8) extending substantially straight extends in a substantially horizontal direction.
  4. 4. Printer according to claim 1, characterized in that said digital printing station (9) comprises at least one inkjet digital printer head (13) along said at least one advancing section (8), facing the upwardly facing face of the sheet-like form of material (2) to be printed.
  5. 5. Printer according to claim 1, characterized in that it comprises at least one first drying station (14) downstream of said at least one digital printing station (9) along said advancing path.
  6. 6. Printer according to claim 5, characterized in that said at least one first drying station (14) is arranged along said at least one inward leg (12).
  7. 7. Printer according to claim 5, characterized in that along said at least one outward leg (10) there is at least one first pushing section (8 a) extending substantially straight and along said at least one inward leg (12) there is at least one second pushing section (8 b) extending substantially straight, said at least one digital printing station (9) being arranged along said at least one first pushing section (8 a) and said at least one first drying station (14) being arranged along said at least one second pushing section (8 b).
  8. 8. Printer according to claim 1, characterized in that said simulated printing station (6) comprises at least one flexographic printing station.
  9. 9. Printer according to claim 1, characterized in that said simulated printing station (6) comprises at least one rotogravure printing station.
  10. 10. Printer according to claim 1, characterized in that said simulated printing station (6) comprises at least one offset printing station.
  11. 11. Printer according to claim 1, characterized in that said simulated printing station (6) comprises at least one station for applying at least one layer for pre-treatment of the sheet-form material to be printed, said simulated printing station being arranged upstream of said conveying device (7) along the direction of rotation of said traction cylinder (3) about its rotation axis.
  12. 12. Printer according to claim 5, characterized in that it comprises at least one second drying station (15) arranged downstream of said exit area (5) along said advancing means.
  13. 13. A printing process is characterized in that it comprises, in succession, the steps of feeding a sheet-form material (2) to be printed to a traction cylinder (3) through an entry zone (4), advancing the sheet-form material (2) adhering to the outer surface of the traction cylinder (3), performing at least one analog printing on the sheet-form material to be printed adhering to the traction cylinder (3), turning the sheet-form material (2) to be printed from the traction cylinder (3) so as to convey it along an advancing path having at least one advancing section (8) extending substantially straight, performing at least one digital printing on the sheet-form material (2) to be printed while it travels along the at least one advancing section (8) substantially straight, returning the sheet-form material (2) to be printed so as to adhere to the outer surface of the traction cylinder (3), advancing the sheet-form material (2) to be printed adhering to the traction cylinder (3), and performing at least one digital printing on the sheet-form material (2) to be printed adhering to the traction cylinder (3) from the sheet-form material (2) to be printed by the at least one analog printing zone (5).
  14. 14. Printing process according to claim 13, characterized in that the step of performing at least one simulated printing before the step of redirecting the material (2) in sheet form from the traction cylinder (3) comprises applying at least one pre-treatment layer on the material in sheet form to be printed.
  15. 15. Printing process according to claim 13, characterized in that after the step of performing at least one digital printing and before the step of returning the material (2) in sheet form to be printed to adhere to the outer surface of the traction cylinder (3), at least one initial drying step of the ink is provided.
  16. 16. Printing process according to claim 13, characterized in that after the step of picking up the material (2) in sheet form from the traction cylinder (3) through the exit area (5), at least one final drying step of the ink is provided.

Description

Printing machine Technical Field The present invention relates to a printing press. Background Known printers are based on different printing techniques. In particular, the known analog printers are based on flexographic printing techniques, which involve performing printing in sheet form on a printed substrate using flexographic relief. Depending on the arrangement of the printing units, the flexographic printing machine may be a central drum with the printing units distributed around a single large printing roller, a "stacked" arrangement of the printing units on top of each other, or an in-line arrangement with the printing units distributed horizontally along the printing line. Another type of analog printer is based on rotogravure printing technology, which involves transferring ink directly onto a different type of printed substrate. In this type of machine, the printing units are usually arranged in a line. Machines based on inkjet digital printing technology are also known, which make it possible to print directly on a printed substrate using digital inkjet printheads arranged along horizontal lines. In recent years, digital printing technology has become of increasing interest to companies in the product packaging industry, because it is economically produced in small batches and with greater flexibility, unlike analog printing technology, and it is characterized by lower costs for storing and handling materials compared to production based solely on analog printing technology. Despite these advantages, digital printers suffer from several drawbacks, including registration of color with stretchable substrates (such as substrates made of LDPE), and problems during travel of the substrate, low solid quality, stitching defects, difficulty in fixing color, high cost of ownership, low productivity, and nozzle loss. In order to combine the advantages of the various techniques, hybrid printers have also been envisaged in an attempt to obtain better print quality, reduce energy consumption and waste, and ensure repeatability of the print quality over time. Such a hybrid machine has an analog printing station and a digital printing station along the advancing path of the material in sheet form to be printed. In the current construction of hybrid machines, the material must travel several meters between the different printing stations, with the consequent risk that the tension of the material in sheet form to be printed may deviate and vary. These factors complicate the handling of the material and lead to increased errors in the printing registration. The difficulty of printing registration results in the operator taking a long time to perform all necessary measurements to obtain as good a print quality as possible. The large number of print tests means a large amount of wasted material. Currently, the combination of the various printing stations results in a hybrid printer having a relatively long longitudinally extending structure, thus occupying a very large area. Furthermore, in order to combine the advantages of the different technologies, digital printers have been proposed, which are equipped with a central cylinder for entraining the material in sheet form to be printed, around which the inkjet digital printing stations are distributed. These machines are also not entirely satisfactory, as they have been found to have lower print quality than conventional digital printers. In addition, these machines are disadvantageous in terms of running costs, low print coverage quality, stitching defects, limited color gamut, and poor drying capacity, thus limiting the printing speed. Disclosure of Invention It is an object of the present invention to provide a printing press which is capable of improving the known art in one or more of the above-mentioned aspects. Within this aim, an object of the present invention is to provide a printing machine that is able to combine the advantages of high print quality with digital printing. It is a further object of the invention to provide a printing press that provides good control over printing registration. Another object of the present invention is to provide a printing press which occupies less space than the currently known hybrid printing presses. It is a further object of the invention to provide a printing machine that reduces waste relative to other known machines. It is a further object of the present invention to provide a flexible printing machine that is capable of producing different types of printed designs. Another object of the present invention is to provide a printer capable of printing on a wide variety of mutually different printed substrates. It is another object of the present invention to provide a printer that has no stitching effect on print coverage. It is a further object of the invention to provide a printer having a color gamut including all colors. Another object of the present invention is to provide a printing machine capable of easily c