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Coating and method capable of decreasing uncoated areas of curtain

A curtain coating and coating technology, used in paper coatings, coatings, textiles and papermaking, etc., can solve the problems of high vehicle speed and low coating amount, and achieve improved coverage quality, low solid content, and good extension. The effect of viscosity

Inactive Publication Date: 2015-10-28
GOLD HUASHENG PAPER SUZHOU IND PARK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating speed of this invention is only 150-800m / min, which still cannot meet the requirements of high speed and low coating amount.

Method used

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  • Coating and method capable of decreasing uncoated areas of curtain
  • Coating and method capable of decreasing uncoated areas of curtain
  • Coating and method capable of decreasing uncoated areas of curtain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A paint that can improve the whiteness of curtain coating. The composition and dosage of raw materials are: wheat starch: 50 parts; phosphorylated potato starch: 12 parts; styrene-butadiene latex: 6 parts; polyacrylamide: 0.5 parts; microcapsules: 100 parts parts; polyamide polyurea epichlorohydrin: 0.8 parts; 0.3 parts of succinate sulfonate, 0.3 parts of sodium hydroxide.

[0037] Add each raw material in sequence according to the above formula, and disperse at high speed to obtain a uniform coating. The solid content of the paint is 28%, the viscosity is 108cps, and the surface tension is 28mN / m.

[0038] Purchase the common common paint on the market separately, and send Styron Company together with the paint prepared by the present invention to test the extensional viscosity with an ACAV ultra-high shear viscometer. The test results are shown in Figure 4 .

[0039] The extended viscosity (viscosity) is represented by the Euler number at different shear rates. Th...

Embodiment 2

[0042] A kind of paint that can improve the whiteness of curtain coating. The raw material composition and dosage are: hydroxymethyl cellulose: 65 parts; acetate corn starch: 6 parts; styrene-acrylic latex: 8 parts; vinyl acetate resin: 1 part; Capsule: 80 parts; Melamine formaldehyde resin: 1 part; Sodium alkylbenzene sulfonate: 0.1 part; Disodium hydrogen phosphate: 0.5 part.

[0043] Add each raw material in sequence according to the above formula, and disperse at high speed to obtain a uniform coating. The solid content of the paint is 27%, the viscosity is 100cps, and the surface tension is 27.5mN / m.

Embodiment 3

[0045]A paint that can improve the whiteness of curtain coating. The composition and dosage of raw materials are: wheat starch: 70 parts; phosphorylated wheat starch: 20 parts; vinegar-acrylic latex: 2 parts; epoxy resin: 0.8 parts; microcapsules: 120 parts parts; glyoxal: 0.5 parts; acetylene glycol: 0.5 parts, ammonia water: 0.5 parts.

[0046] Add each raw material in sequence according to the above formula, and disperse at high speed to obtain a uniform coating. The solid content of the paint is 25%, the viscosity is 90cps, and the surface tension is 26.9mN / m.

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PUM

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Abstract

The invention discloses a coating and method capable of decreasing uncoated areas of a curtain. The coating capable of decreasing the uncoated areas of the curtain comprises separation agents, starch, latex, extension agents, microcapsules, water repellent agents, interfacial agents and pH modifiers. The coating has good extension viscosity, so the operation stability of the curtain is obviously improved; when stretched vigorously at the moment when the coating is in contact with a paper web, the coating can bear certain deformation and cannot break easily, the covering quality of the coating can be easily improved, and the uncoated areas existing on the surface of coated carbonless copy paper are obviously decreased.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a coating capable of improving the whiteness of curtain coating. Background technique [0002] Carbonless copy paper (NCR) is generally composed of three paper sheets, which are upper paper (CB paper), middle paper (CFB paper) and lower paper (CF paper). The back of the upper paper is coated with microcapsules; The front side is coated with a developer, and the back is coated with microcapsules; the front side of the lower paper is coated with a developer. The impact pressure during writing or printing can crush the microcapsules, causing the chromogen to flow out and contact the chromogen, and a chemical reaction occurs to present colored graphics, thereby achieving the purpose of copying. [0003] At present, the mainstream coating methods of carbonless copy paper are rod coating and curtain coating. Rod coating is easy to cause the microcapsules on the CB surface to break...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/14D21H21/06D21H19/20D21H21/54D21H23/48
Inventor 丁力陈汉彬李娟
Owner GOLD HUASHENG PAPER SUZHOU IND PARK
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