11. Intaglio plate pattern dry and embedded version and other reasons:
(1) The ink dryness is too fast and the viscosity of the ink is large.
(2) Inclusion of impurities.
(3) poor re-solubility, the amount of ink remaining in the plate.
Approach:
(1) Drying is slowed by the following contact printing time.
High-speed rotary machine 0.015 ~ 0.02 seconds;
Medium and low rotary machine 0.04 to 0.1 seconds;
High-speed single sheet machine 0.1 ~ 0.15 seconds;
Low speed single sheet machine 0.5 to 0.6 seconds.
The number of seconds above is the time it takes for a good ink to be imprinted on paper.
(2) The hair blows onto the layout.
(3) Increase the true solvent and enhance resolubility.
12. Overflow phenomenon: Spots appear on the full-print part of the ink, and the ink overflows from the line part.
Cause: The viscosity of the ink is too low.
Approach:
(1) When the viscosity is too low, add a new ink or add a modifier with a resin to increase the viscosity.
(2) Improve printing speed.
(3) Change the squeegee angle and use an acute squeegee.
(4) When the pattern is too deep, shallow patterns are used (dark tone standard is 30-50 microns).
13. The phenomenon of poor gloss of printed products: The printed products cannot reach the gloss requirements and the surface is thick.
Cause: The resin composition in the ink is small, and the thinning is excessive. The resin film is not good and the ink is not good. The substrate is too rough.
Approach:
(1) A nitrocellulose solution may be added to a conditioner with a resin, such as a plastic ink.
(2) Properly slow dry speed.
(3) Replace the substrate.
14. Occurrence of orange peel markings: imprinting is not level, water orange peel, especially full version.
the reason:
(1) Drying too fast.
(2) The ink density is too light.
(3) Poor ink leveling.
(4) Large thixotropy of ink.
(5) The affinity between the printing roller and the paper in the aqueous ink is not good.
(6) Electrostatic effects.
(7) Slow speed.
Approach:
(1) Improve the fluidity of the ink.
(2) Adjust the drying speed.
(3) Increase ink viscosity and increase leveling.
(4) Do not dilute the color too lightly.
(5) Reduce static electricity.
15. Pigment precipitation:
Phenomenon: The color becomes lighter or discolored, resulting in a paste version.
the reason:
(1) The pigment has poor affinity with the medium and coagulates together after being dispersed.
(2) Insufficient dispersion.
(3) The viscosity is too low and the stirring is insufficient.
Approach:
(1) Add anti-precipitation agent when making ink.
(2) Full dispersion and rolling.
(3) Select affinity pigments and media.
(4) Stir thoroughly while using.
16. Friction and fouling of the guide roller system: Friction occurs on the rod during transport and the film is peeled off, resulting in fouling.
the reason:
(1) The ink dries too slowly.
(2) or due to too little resin, resulting in powdering, powder falling.
(3) After the membrane is dry, the abrasion resistance is poor.
(4) Poor contact.
Approach:
(1) Correct the irregularities on the guide roller and the transmission rod.
(2) Accelerate dryness.
(3) Increase the amount of resin binder.
17. Webization (similar to orange peel)
The ink in the prints that should have been continuous and fully printed was irregular, showing no ink on the part of the drawing line, and the full-page part could not be smoothly and smoothly printed.
the reason:
(1) Improper ink and plate rollers.
(2) Squeegee pressure and substrate are not appropriate.
(3) Inappropriate ink properties, such as: ink viscosity is too thick (hard), ink flow is not good, the ink is doing too fast.
(4) Plate rollers are not standard, such as eccentricity of plate rollers, and poor chrome plating.
(5) The squeegee is too tight and the ink scrapes too much.
(6) Insufficient printing pressure (20 kg/cm2 for normal paper and 50 kg/cm2 for rough paper)
(7) The substrate surface has poor smoothness, rough or poor coating treatment, or foreign matter attached thereto.
Approach:
(1) Use normal-etched and chrome-plated plate cylinders.
(2) Adjust the blade angle properly.
(3) Increase press pressure as much as possible.
(4) Use an ink having a proper viscosity and fluidity.
(5) Adjust dry speed.
(6) Eliminates foaming in the ink.
(7) Adjust the print smoothness.
18. Anti-printing and accumulation of contamination: After the roll or pile is printed, the reverse side of the substrate has ink sticking.
the reason:
(1) The solvent is volatile.
(2) Too much high boiling point solvent.
(3) The resin has poor solvent removal, the resin itself is of poor quality, sticky, the molecular weight is too low, and the residue is too much.
(4) The pattern is too dark and the ink is too thick.
(5) The drying device is not fully utilized.
(6) Ink additives (such as plasticizers, etc.) are not suitable in nature.
(7) The accumulation of environmental suffocation is dull.
Approach:
(1) Increase the drying speed.
(2) change the resin for ink.
(3) Adjust the dryness with a quick-drying solvent.
(4) Adjust the pattern depth.
(5) Improve environmental ventilation.
(1) The ink dryness is too fast and the viscosity of the ink is large.
(2) Inclusion of impurities.
(3) poor re-solubility, the amount of ink remaining in the plate.
Approach:
(1) Drying is slowed by the following contact printing time.
High-speed rotary machine 0.015 ~ 0.02 seconds;
Medium and low rotary machine 0.04 to 0.1 seconds;
High-speed single sheet machine 0.1 ~ 0.15 seconds;
Low speed single sheet machine 0.5 to 0.6 seconds.
The number of seconds above is the time it takes for a good ink to be imprinted on paper.
(2) The hair blows onto the layout.
(3) Increase the true solvent and enhance resolubility.
12. Overflow phenomenon: Spots appear on the full-print part of the ink, and the ink overflows from the line part.
Cause: The viscosity of the ink is too low.
Approach:
(1) When the viscosity is too low, add a new ink or add a modifier with a resin to increase the viscosity.
(2) Improve printing speed.
(3) Change the squeegee angle and use an acute squeegee.
(4) When the pattern is too deep, shallow patterns are used (dark tone standard is 30-50 microns).
13. The phenomenon of poor gloss of printed products: The printed products cannot reach the gloss requirements and the surface is thick.
Cause: The resin composition in the ink is small, and the thinning is excessive. The resin film is not good and the ink is not good. The substrate is too rough.
Approach:
(1) A nitrocellulose solution may be added to a conditioner with a resin, such as a plastic ink.
(2) Properly slow dry speed.
(3) Replace the substrate.
14. Occurrence of orange peel markings: imprinting is not level, water orange peel, especially full version.
the reason:
(1) Drying too fast.
(2) The ink density is too light.
(3) Poor ink leveling.
(4) Large thixotropy of ink.
(5) The affinity between the printing roller and the paper in the aqueous ink is not good.
(6) Electrostatic effects.
(7) Slow speed.
Approach:
(1) Improve the fluidity of the ink.
(2) Adjust the drying speed.
(3) Increase ink viscosity and increase leveling.
(4) Do not dilute the color too lightly.
(5) Reduce static electricity.
15. Pigment precipitation:
Phenomenon: The color becomes lighter or discolored, resulting in a paste version.
the reason:
(1) The pigment has poor affinity with the medium and coagulates together after being dispersed.
(2) Insufficient dispersion.
(3) The viscosity is too low and the stirring is insufficient.
Approach:
(1) Add anti-precipitation agent when making ink.
(2) Full dispersion and rolling.
(3) Select affinity pigments and media.
(4) Stir thoroughly while using.
16. Friction and fouling of the guide roller system: Friction occurs on the rod during transport and the film is peeled off, resulting in fouling.
the reason:
(1) The ink dries too slowly.
(2) or due to too little resin, resulting in powdering, powder falling.
(3) After the membrane is dry, the abrasion resistance is poor.
(4) Poor contact.
Approach:
(1) Correct the irregularities on the guide roller and the transmission rod.
(2) Accelerate dryness.
(3) Increase the amount of resin binder.
17. Webization (similar to orange peel)
The ink in the prints that should have been continuous and fully printed was irregular, showing no ink on the part of the drawing line, and the full-page part could not be smoothly and smoothly printed.
the reason:
(1) Improper ink and plate rollers.
(2) Squeegee pressure and substrate are not appropriate.
(3) Inappropriate ink properties, such as: ink viscosity is too thick (hard), ink flow is not good, the ink is doing too fast.
(4) Plate rollers are not standard, such as eccentricity of plate rollers, and poor chrome plating.
(5) The squeegee is too tight and the ink scrapes too much.
(6) Insufficient printing pressure (20 kg/cm2 for normal paper and 50 kg/cm2 for rough paper)
(7) The substrate surface has poor smoothness, rough or poor coating treatment, or foreign matter attached thereto.
Approach:
(1) Use normal-etched and chrome-plated plate cylinders.
(2) Adjust the blade angle properly.
(3) Increase press pressure as much as possible.
(4) Use an ink having a proper viscosity and fluidity.
(5) Adjust dry speed.
(6) Eliminates foaming in the ink.
(7) Adjust the print smoothness.
18. Anti-printing and accumulation of contamination: After the roll or pile is printed, the reverse side of the substrate has ink sticking.
the reason:
(1) The solvent is volatile.
(2) Too much high boiling point solvent.
(3) The resin has poor solvent removal, the resin itself is of poor quality, sticky, the molecular weight is too low, and the residue is too much.
(4) The pattern is too dark and the ink is too thick.
(5) The drying device is not fully utilized.
(6) Ink additives (such as plasticizers, etc.) are not suitable in nature.
(7) The accumulation of environmental suffocation is dull.
Approach:
(1) Increase the drying speed.
(2) change the resin for ink.
(3) Adjust the dryness with a quick-drying solvent.
(4) Adjust the pattern depth.
(5) Improve environmental ventilation.
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