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A printing substrate

A material and offset printing technology, applied in printing, pigmented coating, fiber raw material processing, etc., can solve problems such as low brightness, achieve improved paper runability, good color tone reproducibility, and suppress ink accumulation

Inactive Publication Date: 2010-03-24
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, flake pigments such as kaolin and talc lead to printing papers with lower brightness compared to calcium carbonate, for example

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The base paper used in the following examples was NeoPress G uncoated base paper, 36 gsm, comprising 50% Northern Bleached Softwood Kraft (NBSK) pulp and 50% machine-made pulp.

[0073] Three samples of base paper were coated with coating compositions comprising pigment compositions comprising different proportions of talc particles and ground calcium carbonate particles, as shown in Table 1.

[0074] Table 1

[0075]

[0076] The talc particles used in the pigment composition have a micron-sized spherical diameter, and the ground calcium carbonate particles have a nanometer-sized spherical diameter. The pigment composition also includes a copolymer of adipic acid with N-2-aminoethyl-1,2-ethylenediamine and epichlorohydrin as a binder.

Embodiment 1a

[0078] Embodiment 1a, the preparation of P1

[0079] Granular talc 1:

[0080] The granular talc used in Example 1a was Finntalc P 05 Pulver, MONDO Minerals, Finland.

[0081] Binder 1:

[0082] Adhesive is the 15% aqueous solution of the copolymer of adipic acid and N-2-aminoethyl-1,2-ethylenediamine and epichlorohydrin, and feature is as follows:

[0083] Total chlorine content: 1.5w%

[0084] Organic chlorine content: <0.5w%

[0085] MW>1000g / mol

[0086] Brookfield viscosity of aqueous solution: 80mPa·s+ / -30mPa·s

[0087] pH: 3.0

[0088] The binder can be prepared, for example, by reacting diethylenetriamine, monoethanolamine and adipic acid in deionized water to produce an intermediate product (1). The obtained intermediate product (1) was reacted with epichlorohydrin using sulfuric acid and calcium sorbate as catalysts. Subsequently, the solids content was adjusted to 12-20w% by adding water and the pH was adjusted to 3 by adding sulfuric acid.

[0089] Nano ...

Embodiment 1b

[0098] Embodiment 1b, the preparation of P3

[0099] Granular Talc 1

[0100] The granular talc used in this example was Finntalc P 05 Pulver, MONDO Minerals, Finland.

[0101] Binder 1:

[0102] The binder was a 15% aqueous solution of the copolymer of adipic acid with N-2-aminoethyl-1,2-ethylenediamine and epichlorohydrin as described in Example 1a.

[0103] Nano granular calcium carbonate 2:

[0104] Nanoparticulate calcium carbonate was produced by continuous grinding of Norwegien Marmor particles with an equal diameter of 45 μm. Grinding was carried out in the presence of 0.85 w% sodium / magnesium-polyacrylate (MW 6000 g / mol, calculated on the total dry weight of the composite) as grinding agent. The nano-calcium carbonate is ground to a dry content of 72w% and has a particle size as shown in Table 3:

[0105] table 3

[0106] Diameter (nm)

Particle number (N), in N%

w％

＜200

97.4

23.6

200-400

2.0

22.4

...

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Abstract

The invention relates to a printing substrate for gravure and offset printing, which substrate exhibits a Cobb(wl5) water absorption value below 15 g / m<2>, preferably below 12 g / m<2>, a Cobb(o,C10) oil absorption value below 1.2 g / m2, preferably below 1 g / m<2>, and an Ink setting below 0.5, preferably below 0.3. The low water and oil absorption in combination with the quite fast ink setting of thesubstrate according to the invention gives rise to a printed substrate with improved printing qualities.

Description

technical field [0001] The present invention relates to printing substrates containing wood fibers. The invention also relates to a printing method comprising said printing substrate. Background of the invention [0002] Offset printing, one of the most commonly used printing methods today, uses an intermediate blanket cylinder to transfer an image from an image carrier (printing plate) to a substrate (usually paper). An offset printing unit includes plate cylinders, ink and dampening rollers, offset cylinders and impression cylinders. The printing plate includes a hydrophilic water-absorbing portion and a hydrophobic ink-absorbing portion. The water-absorbing parts of the printing plate form the non-image areas, while the ink-absorbing parts form the image areas. Fountain rollers apply chemically modified water, the so-called fountain solution, to the non-image areas of the printing plate and subsequently apply ink to the image areas of the printing plate. Ink and fount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/38B41M5/52
CPCB41M5/52D21H19/38D21H19/40B41M5/5218D21H19/62D21H19/385B41M5/5263B41M5/508D21H21/52
Inventor 奥利·哈基拉保罗-海因茨·迪林
Owner STORA ENSO OYJ
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