Method for manufacturing printed matter and printed matter

Patent metadata

Field	Value
Publication number	US-10953679-B2
Application number	US-201916351820-A
Country	US
Kind code	B2
Filing date	Mar 13, 2019
Priority date	Mar 19, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A method for manufacturing printed matter is provided. The method includes the steps of: irradiating applied droplets of an active energy ray curable composition with an active energy ray having an illuminance less than 0.8 times a maximum gloss illuminance; and applying droplets of the active energy ray curable composition onto the applied droplets irradiated in the irradiating.

First claim

The invention claimed is:

1. A method for manufacturing printed matter, comprising:
irradiating applied droplets of an active-enemy-ray-curable composition with a first active energy ray having an illuminance less than a predetermined illuminance;
applying additional droplets of the active-energy-ray-curable composition onto the applied droplets irradiated in the irradiating step; and
solidifying a surface of the additional droplets by irradiating the additional droplets of the active-energy-ray-curable composition applied in the applying step with a second active energy ray having an illuminance greater than the predetermined illuminance,
wherein the irradiating step forms a solid-liquid separation structure having a liquid surface, and the applying step forms pattern-shaped irregularities.

2. The method according to claim 1 , wherein the luminance of the second active energy ray is 1.2 times the predetermined illuminance or more, and the luminance of the first active energy ray is 0.8 times the predetermined illuminance or less.

3. The method according to claim 1 , wherein the first active energy ray has an illuminance 0.5 times the predetermined illuminance or less.

4. The method according to claim 1 , further comprising:
dividing an input image by dot unit to obtain low density images; and
repeating the irradiating step and the applying step to print the low density images in sequence to reproduce the input image.

5. The method according to claim 4 , further comprising:
forming an outermost surface of each of the low density images by irradiating the additional droplets of the active-energy-ray-curable composition applied in the applying step with the second active energy ray having an illuminance 1.2 times the predetermined illuminance or more.

6. The method according to claim 1 , wherein the active-energy-ray-curable composition comprises a multifunctional monomer having two or more functional groups accounting for 50% by mass or more of a total amount of monomers.

7. The method according to claim 1 , wherein the irradiating and applying steps are carried out in an atmosphere.

8. The printed matter manufactured by the method according to claim 1 , wherein the printed matter has a gloss ratio of 1.3 or less, the gloss ratio being a ratio of an 85-degree glossiness to a 60-degree glossiness.

9. The printed matter according to claim 8 , wherein the gloss ratio is 1.1 or less.

10. The method of claim 1 , wherein the predetermined illuminance is determined by measuring a gloss of each of a plurality of printed matters manufactured using the active-energy-ray-curable composition using a corresponding plurality of active energy ray illuminance values, and selecting one of the active energy ray illuminance values at which the measured gloss was maximum.

11. The method of claim 1 , wherein the applied droplets and the additional droplets have a same composition.

12. A method for manufacturing printed matter, comprising:
irradiating applied droplets of an active-energy-ray-curable composition with a first active energy ray having an illuminance 0.8 to 1.49 times a predetermined illuminance; and
applying additional droplets of the active-energy-ray-curable composition onto the applied droplets irradiated in the irradiating step,
wherein the predetermined illuminance is determined by measuring a gloss of each of a plurality of printed matters manufactured using the active-energy-ray-curable composition using a corresponding plurality of active energy ray illuminance values, and selecting one of the active energy ray illuminance values at which the measured gloss was maximum.

13. The method according to claim 12 , further comprising:
solidifying a surface of the additional droplets by irradiating the additional droplets of the active-energy-ray-curable composition applied in the applying step with a second active energy ray having an illuminance 1.2 times the predetermined illuminance or more.

14. A method for manufacturing printed matter, comprising:
(a) irradiating applied droplets of an active-energy-ray-curable composition with a first active energy ray having an illuminance less than 0.8 times a predetermined illuminance;
(b) irradiating second applied droplets of the active-energy-ray-curable composition with a second active energy ray having an illuminance 0.8 to 1.49 times the predetermined illuminance; and
(c) applying additional droplets of the active-energy-ray-curable composition onto the applied droplets irradiated in the steps (a) and (b),
wherein the predetermined illuminance is determined by measuring a gloss of each of a plurality of printed matters manufactured using the active-energy-ray-curable composition using a corresponding plurality of active energy ray illuminance values, and selecting one of the active energy ray illuminance values at which the measured gloss was maximum.

15. The method according to claim 14 , wherein a ratio of a maximum illuminance of the second active energy ray to a minimum illuminance of the first active energy ray is 1.2 or more.

16. The method according to claim 14 , further comprising:
adjusting an output of a light source emitting the first active energy ray to control a 60-degree glossiness of the printed matter within a range in which a difference between a maximum value and a minimum value of the 60-degree glossiness is 20 degrees or more.

17. The method according to claim 16 ,
wherein the printed matter comprises a color image formed of two color inks, each comprising the active-energy-ray-curable composition,
wherein a ratio in illuminance of the first active energy ray at which the 60-degree glossiness is maximized for the two color inks is 1.2 or less.

18. The method according to claim 14 , further comprising:
measuring a color and a glossiness of an image,
wherein the illuminance of the first active energy ray corresponds to the color and the glossiness to reproduce the image.

Assignees

• Arita Manabu
• Ricoh Co Ltd

Inventors

• Arita Manabu

Classifications

• B41M7/0081 Primary

  using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams · CPC title

• B41M3/008

  Sequential or multiple printing, e.g. on previously printed background; Mirror printing; Recto-verso printing; using a combination of different printing techniques; Printing of patterns visible in reflection and by transparency; by superposing printed artifacts · CPC title

• B41M5/0011 Primary

  Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating (after-treatment of prints B41M7/00; printers for treating or overcoating copy materials before, during or after printing B41J11/0015) · CPC title