Corrugated carton production common problems Raiders--Printing process (a)

Printing process

Question 1: Unclear pattern, paste, ink

Cause Analysis:

(1) Inconvenient printing caused by uneven boardlining; (2) Inconsistent printing presses, unsatisfactory pattern printing caused by small printing pressure, and high pressure caused by printing ink or ink; (3) Large viscosity of ink, resulting in paste Ink and ink; (4) The ink is quick-drying, resulting in unclear printing; (5) The printing operator fails to wipe the plate in time, resulting in paste ink or ink stains; (6) Printing plate ink is not good, resulting in unclear patterns (7) Pressure on the press.

ways to improve:

(1) Make sure the flatness of the box board is ensured when the line board is produced; (2) Adjust the pressure of the printing press according to the thickness of the box board, and remove the debris from the lower pressure roller; (3) Control the ink viscosity to about 25 seconds; 4) Appropriately add ink quick-drying agent to control the fast-drying speed of the ink; (5) The printer can wipe the plate at any time according to the production conditions; (6) According to the actual situation of the printing plate, select the appropriate plate or use thin Paper will lift the plate; (7) Adjust the gap between the roller and the roller so that the plate can fully contact the roller.

Question 2: Inaccurate, floral version

Cause Analysis:

(1) uneven thickness of the box or partial unevenness of the box board; (2) foreign matter under the pressure roller; (3) paperboard guide roller pressure or gap between the left and right; (4) with deep line; (5) printing plate Inconsistent thickness and thickness; (6) The gap between the ink roller and the printing plate is inconsistent with the gap between the left and right sides; (7) The surface of the box plate has impurities that cause the printing plate to become dirty; (8) The viscosity of the ink is low; (9) The machine speed is too slow; (10 ) The temperature of the surrounding environment of the printing press; (11) The ink roller is thrown away.

ways to improve:

(1) Control the flatness of the boxboard and ensure that the thickness of the boxboard is consistent; (2) Check and keep clean at any time; (3) Adjust the pressure of the paperboard introduction roller and keep the left and right gaps consistent with zero error; (4) Determined according to the printing position requirements Whether the box board has a line; (5) Ensure that the thickness of the printing plate is consistent and the error is zero; (6) Keep the gap between the ink roller and the printing plate appropriate and keep the left and right consistent; (7) Remove any debris on the surface of the box board with the brush at any time. , And keep the printing plate surface clean; (8) Increase the viscosity of the ink and add new ink or spacer sheet printing at any time to increase the machine speed and increase the gap between the rubber roller and the anilox roller; (9) Increase the ink viscosity or increase the machine speed; 10) Keep the ambient temperature around the printing machine as the seasons change; (11) Check and adjust the operation of the equipment at any time.

Question: 3: Inconsistent shades of shades

Cause Analysis:

(1) Significant differences between the printing effect and the color standard: 1 wrong ink usage; 2 long ink placement time; 3 inconsistent background color of the paper; 4 inconsistent standards for inspection personnel; (2) inconsistent depth of the same color in the same layout; (3) same Batch printing color shades are inconsistent: 1 uneven thickness of the same batch of boxboard; 2 inconsistent color of the same batch of layout paper; 3 inconsistent speed of the same batch of products; 4 ink of the same batch viscosity is inconsistent.

ways to improve:

(1) 1 strictly in accordance with the "product drawing" requirements for the use of ink; 2 prohibit the use of extended ink (ink storage period does not exceed 60 days); 3 strict control of the process into the printing process of the color of the face paper; 4 to determine the standard color PANTONE number Or the color confirmed by the customer; (2) The thickness of both ends of the box board is kept the same or the gap between the roller, the anilox roller, and the printing plate is consistent; (3) 1 The thickness of the same batch of product box board is guaranteed; 2 The strict control of the process Transfer to the printing process of the color of the face paper; 3 the same batch of products strictly control the production speed to ensure consistency; 4 use ink to adjust the viscosity at any time, add new ink or thinner.

Question: 4: Missing word missing content

Cause Analysis:

(1) The contents of the printing plate are lost; (2) The box board is partly sunken or has some dirt; (3) The gap between the lower pressure roller and the sticking roller is too large.

ways to improve:

(1)1 strictly inspect the contents of the printing plate according to the “Product Drawings”; 2 the first item must be checked; 3 the process inspection; 4 the factory inspection; (2) strictly control the quality of the upper plate that is transferred to the printing process, and promptly clear the printing The dirt on the plate ensures the normal function of the brush of the printing machine; (3) Adjust the gap between the lower pressure roller and the platen roller according to the thickness of the box plate.