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Single-sided coated paper with low curl and its preparation method

A single-sided coating, curling technology, applied in papermaking, coating, paper coating, etc., can solve problems such as increasing costs

Active Publication Date: 2022-01-25
JINGUANG PAPER CHINA INVESTMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dealing with curled coated base paper can be particularly challenging when the base paper appears to be dimensionally stable prior to coating, and various efforts may be made such as coating the backside similarly to the top coat Coating (for example, the use of pigments, etc., which greatly increases the cost of the product)

Method used

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  • Single-sided coated paper with low curl and its preparation method
  • Single-sided coated paper with low curl and its preparation method
  • Single-sided coated paper with low curl and its preparation method

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Experimental program
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Embodiment approach

[0048] The present invention discloses a single side coated paper with anti-curling ability, said coated paper comprises an uncoated base paper base layer, a first coating layer applied on the first surface of the base layer and the other side can be balanced The first coat stresses the second coat. Wherein, the basis weight range of the uncoated raw paper base layer used in each embodiment of the present invention is between 30~300gsm, the first coating mainly includes binding material and mineral particles, and the second coating is an anti-roll coating , the dry basis weight of which is between 5% and 30% of the dry basis weight of the first coating. The second coating is formed by mixing cold water soluble starch or starch derivatives, cross-linking agent and polyvinyl alcohol into a slurry in a certain proportion, and then coating. The second coating does not contain mineral particles substantially, or is low in mineral particles. 1% of the dry basis weight of the coatin...

Embodiment 1

[0124] Use a base paper web of 30gsm to 300gsm, and the weight of the base paper used this time is 79 grams, the same below. The base paper contains not more than 10% mechanical pulp and the rest is bleached chemical pulp. It may also contain fillers, usually calcium carbonate, in an amount not exceeding 20% ​​based on the dry weight of the fibres. Use 85wt% DLV is used as cold water soluble starch or starch derivative with a solid content of 13wt%, and 15wt% Beset 2125 as a crosslinking agent with a solid content of 15wt% to form a second coat of paint with a coating weight of 2.3gsm; the first coat The layer consisted of 8% tapioca starch, 92.0% ground calcium carbonate mix slurry with a coat weight of 15 gsm.

Embodiment 2

[0126] Use 30gsm ~ 300gsm base paper web, use 76.2% DLV as cold water soluble starch or starch derivative with a solid content of 13wt%, 4.8%wt% Beset 2125 as a crosslinker with a solid content of 15wt%, 19%wt% Sekisu as PVOH with a solid content of 7wt%, forming a coating Apply the second coating, the coating amount is 2.04gsm; the first coating is composed of 8% tapioca starch, 92.0% ground calcium carbonate mixed slurry, and the coating amount is 15gsm.

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Abstract

The present invention relates to a single side coated paper having low curl and a method for making the same, comprising a base layer, a first coating layer on a first surface of the base layer and a second coating layer on a second surface of the base layer, the basis weight of the base layer The range is between 30gsm to 300gsm; the first coating includes binding material and mineral particles, the second coating is substantially free of mineral particles and coated with cold water soluble starch, polyvinyl alcohol and crosslinking agent Coating; wherein the polyvinyl alcohol has a degree of alcoholysis of at least 85%; wherein the humidity of the paper obtained after drying of the first coating and the second coating is less than or equal to 5%, and the paper has an endpoint curl factor Less than 8mm, or an average curl factor of less than 4mm. The single-layer coated paper of the present invention can effectively resist curling under different humidity environments.

Description

technical field [0001] The present invention relates to a single-sided coated paper with low curl and its preparation method. Background technique [0002] One of the challenges in papermaking is that since cellulose paper fibers are hygroscopic materials, they absorb moisture from humid air or other sources, which changes the physical properties of the paper. When fibers absorb moisture, they tend to swell, or when they dry, they tend to shrink, and expansion or shrinkage of fibers can lead to unbalanced stresses, which can adversely affect the flatness or dimensional stability of the web. Due to the heterogeneity of the paper web structure, the reaction of an initially flat paper web due to moisture changes can lead to paper curling. [0003] Curl is especially problematic in coated papers, since the coating on one side of the web is usually different from the coating (if any) applied to the other side of the web, unevenness in the applied coating causes and magnifies the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/84D21H19/14D21H19/24D21H21/14
CPCD21H19/84D21H19/14D21H19/24D21H21/14
Inventor 玛莎·帕特里克·怀尔德朱叶峰陶卫峰吴国泉
Owner JINGUANG PAPER CHINA INVESTMENT