CN-121973549-A - Print quality closed loop control system and printing device

CN121973549ACN 121973549 ACN121973549 ACN 121973549ACN-121973549-A

Abstract

The application provides a printing quality closed-loop control system and printing equipment, wherein the printing quality closed-loop control system is applied to the printing equipment and comprises a quality detection device, an analysis device, a printing quality control device and a parameter adjustment execution device; the quality detection device is used for detecting the quality of the printed matter and determining that the printed matter is a qualified printed matter or a defective printed matter, the analysis device is connected with the quality detection device and used for analyzing the defective printed matter and determining that the defect type of the defective printed matter is a first type defect or a second type defect, and the printing quality control device is connected with the analysis device and the parameter adjustment execution device and can control the parameter adjustment execution device to work under the condition that the analysis device analyzes that the defect type of the defective printed matter is the first type defect so as to adjust the working parameters of printing equipment.

Inventors

LI FANGJIAN
JIANG JUN
PAN PINLI
MA JIAN
CHEN XUDONG
GUO LISHA

Assignees

中国印钞造币集团有限公司
中钞印制技术研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20230926

Claims (8)

1. The printing quality closed-loop control system is characterized by being applied to printing equipment and comprising a quality detection device, an analysis device, a printing quality control device and a parameter adjustment execution device; The quality detection device is used for detecting the quality of the printed matter and determining that the printed matter is a qualified printed matter or a defective printed matter; the analysis device is connected with the quality detection device and is used for analyzing the defect printed matter and determining whether the defect type of the defect printed matter is a first type defect or a second type defect; the printing quality control device is connected with the analysis device and the parameter adjustment execution device, and can control the parameter adjustment execution device to work so as to adjust the working parameters of the printing equipment when the analysis device analyzes that the defect type of the defective printed matter is a first type defect; the quality detection device comprises an online quality detection device and an offline quality detection device, and the printing quality closed-loop control system further comprises: The re-judging device is connected with the quality detection device and is used for re-judging the defective printed matter; the first type of defects include ink quantity defects, ink temperature defects, printing pressure defects, wiping pressure defects, cylinder temperature defects, doctor blade position defects, and overprinting position defects; The printing quality control device can control the parameter adjustment execution device to adjust at least one of the following parameters of the printing equipment, namely ink quantity, ink temperature, printing pressure, wiping plate pressure, roller temperature, scraper position and overprinting position based on the analysis result of the analysis device; The off-line quality detection device is specifically used for off-line detection of ink color, printing pressure and line width of the printed matter, and when one of the ink color, the printing pressure or the line width does not meet the standard, the printed matter is determined to be a defective printed matter.
2. The closed-loop control system according to claim 1, wherein, in the case that the off-line quality detection device detects the ink color of the printed matter, the off-line quality detection device is specifically configured to divide the image of the printed matter into different partitions according to different colors by using a color division method, compare the color of each partition with the standard color of the corresponding partition, determine a color difference value between the color of each partition and the standard color of the corresponding partition based on a quantization table, and determine that the printed matter is a qualified printed matter or a defective printed matter according to the color difference value of each partition.
3. The print quality closed loop control system of claim 2, wherein, And under the condition that the offline quality detection device determines that the printed matter is a defective printed matter, the printing quality control device controls the parameter adjustment execution device to adjust the ink quantity of the printing equipment according to the corresponding relation between the adjustment quantity and the color difference value.
4. The print quality closed loop control system of claim 3, Based on different printed matters and different printing plate text densities, the printing quality control device can control the parameter adjustment execution device to adjust the ink quantity of the printing equipment according to different corresponding relations between the adjustment quantity and the color difference value.
5. The print quality closed loop control system of claim 4, When the printing quality control device controls the parameter adjustment execution device to adjust the ink quantity of the printing equipment, the ink color change value of the adjustment quantity is more than or equal to 1NBS.
6. A printing apparatus, comprising: the print quality closed loop control system of any of claims 1 to 5.
7. The printing apparatus of claim 6, further comprising: the cover body, be provided with the opening on the cover body, quality detection device sets up in the cover body can be through the opening is right the printed matter detects.
8. The printing apparatus of claim 7, further comprising: the blowing flattening device is arranged on the cover body and corresponds to the opening, and is used for blowing air to the surface of the printed matter, so that the printed matter can be stably attached to the roller of the printing equipment.

Description

Print quality closed loop control system and printing device The present application is a divisional application of chinese patent application with application number "202311257262.1", titled "print quality closed loop control system and printing apparatus", 26, 09, 2023, the entire contents of which are incorporated herein by reference. Technical Field The application relates to the technical field of printing, in particular to a printing quality closed-loop control system and printing equipment. Background The printing quality control of the product of the printing device involves a plurality of factors, such as printing pressure, temperature, plate wiping effect, plate state, ink quantity control and the like. At present, the printing quality control of the existing printing equipment mainly depends on manual adjustment, an operator manually adjusts and maintains parameters according to quality information fed back by an online/offline quality detection device, and the technical experience, responsibility and manual investment of the operator are very high. Accordingly, providing a printing apparatus capable of automatically controlling print quality is a currently urgent problem to be solved. Disclosure of Invention The present invention aims to solve or improve at least one of the above technical problems. A first aspect of the present invention is to provide a print quality closed loop control system. A second aspect of the present invention is to provide a printing apparatus. The technical scheme of the first aspect of the invention provides a printing quality closed-loop control system which is applied to printing equipment. The quality detection device is used for detecting the quality of the printed matter and determining that the printed matter is a qualified printed matter or a defective printed matter, the analysis device is connected with the quality detection device and used for analyzing the defective printed matter and determining that the defect type of the defective printed matter is a first type defect or a second type defect, and the printing quality control device is connected with the analysis device and the parameter adjustment execution device and can control the parameter adjustment execution device to work under the condition that the analysis device analyzes that the defect type of the defective printed matter is the first type defect so as to adjust the working parameters of printing equipment. The printing quality closed-loop control system provided by the invention is characterized in that a quality detection device is used for detecting the quality of a printed matter, the printed matter is determined to be a qualified printed matter or a defective printed matter, then an analysis device is used for analyzing the defective printed matter, and the defective printed matter is determined to be a first type defect or a second type defect, wherein the first type defect refers to a defect which can be overcome by changing the working parameters of printing equipment, the second type defect refers to a defect which can not be overcome by changing the working parameters of the printing equipment, namely, a defect which needs to be subjected to shutdown treatment, and the printing quality control device can control the parameter adjustment execution device to work when the analysis device analyzes that the defective printed matter is the first type defect so as to adjust the working parameters of the printing equipment. When the printing defects exist, the invention can automatically regulate and control the working parameters of the printing equipment, thus the shutdown processing is not needed, and the printing efficiency is greatly improved. Optionally, the quality detection device comprises an online quality detection device and an offline quality detection device, and the printing quality closed-loop control system further comprises a re-judging device connected with the quality detection device and used for re-judging the defective printed matter. In the technical scheme, the online quality detection device is not only provided with the online quality detection device, but also provided with the offline quality detection device for offline detection of the printed matter and determination of whether the printed matter is a qualified printed matter or a defective printed matter, and the online quality detection device and the offline quality detection device have advantages and complement each other in terms of detection items, precision, accuracy and the like, so that the detection precision of the online quality detection device is high, and the result accuracy is high. In addition, the printing quality closed-loop control system provided by the invention is additionally provided with the re-judging device, so that the defective printed matter detected by the quality detection device can be selectively detected, and the misjudgment of the traditional quality detection device ca