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Method to reduce back trap offset print mottle

Inactive Publication Date: 2006-03-23
BASF CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003] This invention provides one or more advantages that are believed to result from inclusion of the low density thermoplastic particles in the basecoat. These advantages include reduced 2nd cyan mottle, enhanced sheet gloss and print gloss and / or enhanced Sheffield and Parker Print smoothness as compared to a similar material having the same characteristics except for the presence of low density thermoplastic particles in the basecoat.

Problems solved by technology

Back trap mottle is an undesired result from offset printing because a non-uniform print image is created.

Method used

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  • Method to reduce back trap offset print mottle
  • Method to reduce back trap offset print mottle
  • Method to reduce back trap offset print mottle

Examples

Experimental program
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Effect test

example 1

A. Preparation of Coating Formulations:

[0031] Preformed aqueous slurries of the pigments and low density thermoplastic particles are added to a high shear mixer. Then dispersant, binder and viscosity modifier are added to the slurry under shear to form a coating formulation having the desired Brookfield viscosity. The viscosity of the basecoat coating formulation is about 1000 centipoises (cps) spindle 4 at 100 revolutions per minute. The viscosity of the topcoat coating formulation is about 700 to 800 centipoises (cps) spindle 4 at 100 revolutions per minute. After final mixing, the coatings are ready for casting.

[0032] Controls were made using the same basecoat and topcoat formulations, except that there was no hollow pigment in the basecoat.

[0033] The coating formulations are set forth in the following Table 1.

TABLE 1Top-Top-Top-Basecoat 1Basecoat 2Basecoat 3Basecoat 4Basecoat 5Basecoat 6Basecoat 7coat 1coat 2coat 3Hydrocarb 60100.085.060.0100.0100.0100.095.0Ropaque HP-1055...

example 2

[0039] Using the procedure of Example 1, coating formulations were prepared. The coating formulations used are set forth in the following Table 4.

TABLE 4Properties / ComponentsBasecoat 8Basecoat 9Topcoat 4Hydrocarb 6010095—Ropaque AF-1353—5.0—Hydragloss 91——40Hydrocarb 90——60Acronal S-86614.014.015.0Acumer 93000.090.090.38L-2290.430.4.30.09Calcium Stearate——2.0Solids (%)68.564.564.0

[0040] Using the procedure of Example 1, Substrate 8 and Substrate 9 coated substrates were prepared. Substrate 8 identified in Table 5 was calendered at 185 C and with sufficient load to achieve 60% gloss measured at 75 and Substrate 9 was calendered under the same calendering conditions as Substrate 8.

TABLE 5Substrate 8Substrate 9Basecoat 8Top coat 4Basecoat 9Topcoat 4

[0041] The coated substrates identified in Table 5 were evaluated to determine their 2 cyan solid print gloss at 60° from a 6-color offset printing press as measured by the procedure of TAPPI test method T480, sheet gloss at 75° as measu...

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Abstract

A paper and paperboard material comprising a paper or paperboard substrate, a basecoat layer on at least one surface of substrate and topcoat on a surface of the basecoat, said topcoat comprising one or more pigments dispersed in one or more binders and said basecoat comprising low density thermoplastic particles dispersed in one or more binders. The basecoat is compressible which reduces back trap print mottle in offset printed images.

Description

BACKGROUND OF THE INVENTION [0001] In offset printing, paper is run through from one to ten or more printing nips. Typically, the heatset web offset (HSWOS) process used for weekly national magazines has four process colors and at least one Pantone, high-light or special color such as the dark blue color on the cover of “Newsweek” magazine, which makes a series of five printing units or offset print nips. Higher quality sheet offset litho printing normally has at least six or more printing units in series. The offset printing process, especially in perfecting presses, has the capability of simultaneously printing both sides of a paper web at speeds as high as 3000 fpm (ft. / min.). The “offset printing process” gets its name from the fact that “images” are formed on lithography plates then transferred (offset) to a rubberized printing blanket stretched around a cylinder. The inked part of the lithography plate that is also stretched around a cylinder forms the image that gets transfer...

Claims

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Application Information

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IPC IPC(8): D21H19/36
CPCD21H19/82
Inventor RODING, SVANTEBUNCH, ABDU YOHANCEVOAS, DONHOSTETLER, RONALD EARL
Owner BASF CORP
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