Cylindrical printing plate, cylindrical printing plate precursor, method for manufacturing cylindrical printing plate precursor, and method for manufacturing cylindrical printing plate

Patent metadata

Field	Value
Publication number	US-10807401-B2
Application number	US-201816045892-A
Country	US
Kind code	B2
Filing date	Jul 26, 2018
Priority date	Feb 2, 2016
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

Provided is to provide a cylindrical printing plate with which printing of excellent solid density and high halftone dot quality is made possible, and further print medium followability and printing durability are excellent, a cylindrical printing plate precursor, a method for manufacturing a cylindrical printing plate precursor, and a method for manufacturing a cylindrical printing plate. A cylindrical printing plate includes a relief layer having a first hard layer, a soft layer, and a second hard layer in this order from a printing surface side, in which a hardness K1 of the first hard layer is 10 MPa or more and less than 20 MPa, a ratio K1/K2 of the hardness K1 of the first hard layer with respect to a hardness K2 of the soft layer is 2.7 or more, a ratio K3/K2 of a hardness K3 of the second hard layer with respect to the hardness K2 of the soft layer is 1.2 or more, a thickness of the first hard layer is 0.05 mm or more and 0.3 mm or less, and a thickness of the soft layer is 0.3 mm or more and 2.0 mm or less.

First claim

What is claimed is:

1. A cylindrical printing plate comprising:
a relief layer having a first hard layer, a soft layer, and a second hard layer in this order from a printing surface side,
wherein a hardness K 1 of the first hard layer is 10 MPa or more and less than 20 MPa,
a ratio K 1 /K 2 of the hardness K 1 of the first hard layer with respect to a hardness K 2 of the soft layer is 2.7 or more,
a ratio K 3 /K 2 of a hardness K 3 of the second hard layer with respect to the hardness K 2 of the soft layer is 1.2 or more,
a thickness of the first hard layer is 0.05 mm or more and 0.3 mm or less, and
a thickness of the soft layer is 0.3 mm or more and 2.0 mm or less.

2. The cylindrical printing plate according to claim 1 ,
wherein the hardness K 2 of the soft layer is less than 5 MPa.

3. The cylindrical printing plate according to claim 1 ,
wherein the hardness K 3 of the second hard layer is 5 MPa or more and less than 10 MPa.

4. The cylindrical printing plate according to claim 1 ,
wherein a thickness of the second hard layer is 2.0 mm or more.

5. The cylindrical printing plate according to claim 1 ,
wherein the first hard layer contains a crystalline polymer.

6. The cylindrical printing plate according to claim 1 ,
wherein the crystalline polymer is at least one selected from a polybutadiene-based thermoplastic elastomer and a polyolefin-based thermoplastic elastomer.

7. A cylindrical printing plate precursor comprising:
a relief forming layer having a first hard layer, a soft layer, and a second hard layer in this order from a printing surface side,
wherein a hardness K 1 of the first hard layer is 10 MPa or more and less than 20 MPa,
a ratio K 1 /K 2 of the hardness K 1 of the first hard layer with respect to a hardness K 2 of the soft layer is 2.7 or more,
a ratio K 3 /K 2 of a hardness K 3 of the second hard layer with respect to the hardness K 2 of the soft layer is 1.2 or more,
a thickness of the first hard layer is 0.05 mm or more and 0.3 mm or less, and
a thickness of the soft layer is 0.3 mm or more and 2.0 mm or less.

8. The cylindrical printing plate precursor according to claim 7 ,
wherein the hardness K 2 of the soft layer is less than 5 MPa.

9. The cylindrical printing plate precursor according to claim 7 ,
wherein the hardness K 3 of the second hard layer is 5 MPa or more and less than 10 MPa.

10. The cylindrical printing plate precursor according to claim 7 ,
wherein a thickness of the second hard layer is 2.0 mm or more.

11. The cylindrical printing plate precursor according to claim 7 ,
wherein the first hard layer contains a crystalline polymer.

12. The cylindrical printing plate precursor according to claim 11 ,
wherein the crystalline polymer is at least one selected from a polybutadiene-based thermoplastic elastomer and a polyolefin-based thermoplastic elastomer.

13. A method for manufacturing a cylindrical printing plate precursor comprising:
an uncured layer forming step of forming, on a peripheral surface of a cylindrical support, an uncured relief forming layer having a first uncured layer which becomes a first hard layer, a second uncured layer which becomes a soft layer, and a third uncured layer which becomes a second hard layer in this order from the cylindrical support; and
a curing step of curing the formed first uncured layer, second uncured layer, and third uncured layer to form a relief forming layer having the first hard layer, the soft layer, and the second hard layer,
wherein a hardness K 1 of the first hard layer after curing is 10 MPa or more and less than 20 MPa,
a ratio K 1 /K 2 of the hardness K 1 of the first hard layer with respect to a hardness K 2 of the soft layer after curing is 2.7 or more,
a ratio K 3 /K 2 of a hardness K 3 of the second hard layer with respect to the hardness K 2 of the soft layer after curing is 1.2 or more,
a thickness of the first hard layer after curing is 0.05 mm or more and 0.3 mm or less, and
a thickness of the soft layer after curing is 0.3 mm or more and 2.0 mm or less.

14. A method of manufacturing a cylindrical printing plate comprising:
an engraving step of performing laser engraving on the relief forming layer of the cylindrical printing plate precursor manufactured by the method of manufacturing a cylindrical printing plate precursor according to claim 13 to form a relief layer.

Assignees

• Fujifilm Corp

Inventors

• Shirakawa Masato
• Namba Yusuke

Classifications

• B41C1/05

  Heat-generating engraving heads, e.g. laser beam, electron beam · CPC title

• B41N1/12

  non-metallic other than stone {, e.g. printing plates or foils comprising inorganic materials in an organic matrix (B41N1/003, B41N1/006 take precedence)} · CPC title

• B41N1/22 Primary

  made of other substances · CPC title

• B41C1/18

  Curved printing formes or printing cylinders {(B41C1/10, B41C1/14 take precedence)} · CPC title

• B41C1/025

  characterised by means for the liquid etching of substrates for the manufacturing of relief or intaglio printing forms, already provided with resist pattern · CPC title