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Methods and means for coating paper by film coating

A paper and coating technology, applied in paper, biochemical equipment and methods, papermaking, etc., can solve problems such as the negative impact of paper whiteness

Active Publication Date: 2015-03-11
艾维贝皇家合作公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are all accompanied by disadvantages in the film coating operation and in the paper properties: the solubility in cold water is not 100%, the water retention is too high and fogging occurs, and the yellow composition of the starch is harmful to the paper due to the dextrinization process. Whiteness has a negative impact

Method used

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  • Methods and means for coating paper by film coating

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0090] Preparation of coating formulation

[0091] The pigment slurry (1000 g dry weight) was added to a 2000 mL beaker and dispersed with a diluent. Add water if needed. Under stirring, add starch (if it is cold water soluble, add in dry state) or starch solution. Under stirring, the synthetic binder is added to the dispersion. Finally, other additives are added to the coating formulation. The formulation was adjusted to the desired pH using diluted sodium hydroxide solution (16w / w%). Use a water bath to adjust the temperature of the coating formulation. The coating composition is diluted with water to the desired amount of dry solids.

[0092] Rheology of coating formulation

[0093] Brookfield viscosity: Brookfield RVDVII, 100rpm, 25°C. The coating was measured in a 500 mL beaker.

[0094] Medium viscosity: Hercules DV-10 high shear at 100rpm and 1000rpm, 25°C. Use Bob / cup method, use Bob type A.

[0095] High shear viscosity: at 1×10 6 s -1 ACAV A2 Ultra High Shear Capill...

Embodiment 1

[0108] Example 1: Stability of coating formulation

[0109] This example shows that compared with other coated starches, it has excellent stability at high concentrations of HBS. Dissolve starch in hot water to measure stability and color. The cold water solubility is determined as described above.

[0110] Compared with other ingredients tested, HBS solutions with a solid content of 50% or 35% are very stable at 50°C and have a very low viscosity. Except for the very clear, colorless and transparent HBS solution, all solutions are yellow to brown.

[0111] Table 1. Brookfield viscosity (mPas) at 50℃ for a certain period of time

[0112]

[0113] CWS = cold water soluble dextrin (= C*Icoat from Cargill)

Embodiment 2

[0114] Example 2: Rheology

[0115] This example shows that HBS imparts excellent rheological properties to the coating composition for film coating application, wherein HBS can be used as the sole binder or can be combined with SB latex. This example also shows that the coating composition prepared according to Example 2 of EP060170B2 does not have rheological properties suitable for coating on a film coater.

[0116] HBS was used to prepare coating compositions for film coating applications and tested for their rheological behavior. At least 50% of the binder is starch.

[0117] Reference paint 1 (R1) is a coating composition including 100 parts of calcium carbonate pigment, 7.5 parts of Perfectacote 45 and 7 parts of latex.

[0118] Reference coating 2 (R2) is a coating composition according to EP0690170B2 including 100 parts of kaolin pigment (SPS clay) and 12.5 parts of HBS.

[0119] The coating 1 (C1) of the present invention is a coating composition comprising 100 parts of calc...

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Abstract

This invention relates to the field of paper coating, more in particular to means and methods for providing paper with at least one layer of pigment using film coating to obtain a well printable surface. Provided is a method for preparing coated paper comprising the steps of: a) providing a pigmented wet coating formulation comprising water, 2-20 parts of a binder and 100 parts of pigment, wherein at least 50% of the binder is highly branched starch (HBS) characterized by a molecular weight of between 0.5* 105 and 1*106 Daltons and having a molecular branching degree of at least 8% and which is obtained by treatment of gelatinized starch or starch derivative with a glycogen branching enzyme (EC 2.4.1.18); and wherein at least 70% of the pigment is calcium carbonate; and b) applying the pigmented wet coating formulation to paper by film coating and drying the coated paper.

Description

Technical field [0001] The present invention relates to the field of paper coating, and more specifically, to an apparatus and method for providing paper with at least one layer of pigment, which utilizes film coating to obtain a surface with good printability. The present invention also relates to a coated paper, which includes paper and a certain amount of paper coating composition on the paper, in which water has been reduced or removed. Background technique [0002] The surface properties of coated paper play an important role in paper and printing quality. Nowadays, paper products must be designed with the best surface properties to meet increasing performance requirements. Technological advancements including larger and faster machines require more cost-effective and environmentally friendly coating methods and products. [0003] The current coating process usually includes two steps: (i) coating a coating medium (also called "coating composition") on paper or board, the co...

Claims

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Application Information

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IPC IPC(8): D21H19/38D21H19/54C08B31/00C08L3/04C09D103/04C12P19/00D21H17/28
CPCD21H17/28D21H19/385C12Y204/01018C09D103/04D21H19/54C09J103/04C09J103/08C12P19/18C09J103/10C09D103/08C09D103/10Y10T428/31975C08K3/26D21H19/58
Inventor 马尔克·佑斯·伊莉斯·科内利斯·凡·德·马乐尔贝伦德·科内利斯·阿伦德·特尔·维尔阿内特·弗丽灵-斯密特迪迪埃·安德雷·皮耶尔·德诺耶
Owner 艾维贝皇家合作公司
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