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In-pulp hard sizing process for raw paper of food cards

A heavy sizing and crafting technology, applied in textiles and papermaking, paper, papermaking and other directions, can solve the problem that the sizing effect is not in the best state, the combination of film and paper is not fast enough, and it is difficult to use high-speed paper cup machines. and other problems, to achieve the effect of good post-processing lamination effect, good edge water absorption resistance, and less rubber dosage.

Active Publication Date: 2014-05-28
ZHUHAI HUAFENG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in-pulp re-sizing is usually required in the preparation process of this type of food card base paper. The "aluminum sulfate + anionic rosin" commonly used in the industry's intra-pulp acid sizing has a pH range of 4.8~6.0. Due to the overall low pH value of the glue method, the system pH tends to decrease during broken paper circulation or white water circulation, and the addition of aluminum sulfate itself can reduce the pH value, which limits the ability of aluminum sulfate when the system pH is low. The addition amount, that is, limits the addition amount of aluminum sulfate used in conjunction with rosin, thereby reducing the sizing effect of rosin, resulting in a suboptimal sizing effect
It even affects the finished paper in the subsequent paper processing process. For example, after laminating, the bonding fastness between the film and the paper surface is not enough, and it is difficult to apply the high-speed paper cup machine process. For example, paper cups or noodle bowls are loaded After being filled with hot water, the water resistance of hot water resistance is not enough, which will easily cause the edge of the paper to rewet and affect the stiffness of the paper cup

Method used

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  • In-pulp hard sizing process for raw paper of food cards
  • In-pulp hard sizing process for raw paper of food cards
  • In-pulp hard sizing process for raw paper of food cards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Base paper for paper cups

[0023] 1. Pulping and pulping

[0024] Composition of surface layer pulp: 40% NBKP kraft softwood pulp and 60% LBKP kraft hardwood pulp mixed pulping, refining, to get the top pulp;

[0025] Add 30% sodium hydroxide solution to adjust the pH to 7.0.

[0026] Core slurry composition: 43% Hardwood BCTMP pulp, 30% NBKP kraft softwood pulp, 27% LBKP kraft hardwood pulp is mixed and pulped, refined to obtain core pulp;

[0027] Add 30% sodium hydroxide solution to adjust the pH to 7.0;

[0028] Bottom pulp composition: 53% NBKP kraft softwood pulp, 47% LBKP kraft hardwood pulp mixed pulping, refining, to get bottom pulp

[0029] Add 30% sodium hydroxide solution to adjust the pH value to 7.0, and add 30% sodium hydroxide solution to adjust the pH value to 7.0.

[0030] 2. Re-sizing in pulp

[0031] Add 15kg / ton of aluminum sulfate to the surface layer slurry, core layer slurry, and bottom layer slurry, and stir evenly;

[00...

Embodiment 2

[0045] Embodiment 2 Noodle bowl base paper

[0046] 1. Pulping and pulping

[0047] Composition of surface layer pulp: 40% NBKP kraft softwood pulp, 60% LBKP kraft hardwood pulp mixed pulping, refining, to get the top pulp;

[0048] Add 30% sodium hydroxide solution to adjust the pH value to 8.5;

[0049] Core slurry composition: 75% Hardwood BCTMP pulp, 13% NBKP kraft softwood pulp, 12% LBKP kraft hardwood pulp is mixed and pulped, refined to obtain core pulp;

[0050] Add 30% sodium hydroxide solution to adjust the pH value to 8.5;

[0051] Bottom pulp composition: 51% NBKP kraft softwood pulp, 49% LBKP kraft broadleaf wood pulp mixed pulping, refining, to get bottom pulp;

[0052] Add 30% sodium hydroxide solution to adjust the pH to 8.5.

[0053] 2. Re-sizing in pulp

[0054] Add 20kg / ton of aluminum sulfate to the surface layer slurry, core layer slurry, and bottom layer slurry, and stir evenly.

[0055] Add 25kg / ton of cationic rosin to the surface layer sl...

Embodiment 3

[0067] Example 3 Lunch box base paper

[0068] 1. Pulping and pulping

[0069] Composition of surface layer pulp: 17% NBKP kraft softwood pulp, 83% LBKP kraft hardwood pulp mixed pulping, refining, to get the top pulp;

[0070] Add 30% sodium hydroxide solution to adjust the pH value to 8.0;

[0071] Core slurry composition: 73% Hardwood BCTMP pulp, 5% NBKP kraft softwood pulp, 22% Sulphate hardwood pulp is mixed and pulped and refined to obtain core pulp;

[0072] Add 30% sodium hydroxide solution to adjust the pH value to 8.0;

[0073] Bottom pulp composition: 17% NBKP kraft softwood pulp, 83% LBKP kraft broadleaf wood pulp mixed pulping, refining, to get bottom pulp;

[0074] Add 30% sodium hydroxide solution to adjust the pH to 8.0.

[0075] 2. Re-sizing in pulp

[0076] Add 20kg / ton of aluminum sulfate to the surface layer slurry, core layer slurry, and bottom layer slurry, and stir evenly.

[0077] Add 25kg / ton of cationic rosin to the surface layer slurry an...

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Abstract

The invention discloses an in-pulp hard sizing process for raw paper of food cards, which includes the following step of 1) preparing pulp; 2) adjusting the pH (potential of hydrogen) value to range from 7.0 to 8.5 by alkali solution; 3) adding aluminum sulfate and rosin into the pulp and mixing uniformly; and 4) delivering the pulp to a slushing pump to enter a papermaking system. Additive amount of the aluminum sulfate and the rosin in the in-pulp hard sizing process can be increased by adding the alkali solution to adjust the pH value to range from 7.0 to 8.5 during pulp preparation, and water edge absorption performance of prepared raw paper of the food cards is fine: edge water seepage at 90 DEG C

Description

technical field [0001] The invention relates to a pulp internal re-sizing process for food card base paper. Background technique [0002] Used in high-grade food card base paper, such as paper cup base paper, lunch box base paper, noodle bowl base paper and other products. The common feature of these products is that they all need to be in contact with liquid food, and some need to be in contact with hot liquid food. Stiffness, cold water resistance, hot water resistance performance requirements are higher. Therefore, in-pulp re-sizing is usually required in the preparation process of this type of food card base paper. The "aluminum sulfate + anionic rosin" commonly used in the industry's intra-pulp acid sizing has a pH range of 4.8~6.0. Due to the overall low pH value of the glue method, the system pH tends to decrease during broken paper circulation or white water circulation, and the addition of aluminum sulfate itself can reduce the pH value, which limits the ability of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H17/21
Inventor 黄欣仇如全陈卫东刘丽图袁化乾陈进权
Owner ZHUHAI HUAFENG PAPER
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