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Plastic-removed food paper and preparation method thereof

A technology of food paper and chemical pulp, applied in the field of paper products

Active Publication Date: 2021-08-03
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all kinds of oil-proof food bags, food mats, mouth cups, sauce cups, and dried fruit, tea, and jerky products on the market often use plastic coated products or all-plastic products, resulting in "white Pollution" is very serious

Method used

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  • Plastic-removed food paper and preparation method thereof

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preparation example Construction

[0020] The invention provides a method for preparing plastic-free food paper, comprising:

[0021] Mix bleached kraft softwood chemical pulp and bleached kraft hardwood chemical pulp, go through thick stock screening, seasoning, pulp flushing, desanding and degassing, sizing, mixing with ASA, and fine sieving to obtain pretreated pulp;

[0022] The pretreated pulp goes through the headbox, wire dehydration forming, pressing, first drying, first surface sizing, second drying, second surface sizing, third drying, calendering, coiling ,production;

[0023] The first surface sizing is: surface sizing with acrylic emulsion; the second surface sizing is: surface sizing with polydimethylsiloxane.

[0024] In the preparation method of plastic-free food paper provided by the invention, firstly, bleached kraft softwood chemical pulp and bleached kraft hardwood chemical pulp are mixed.

[0025] The present invention does not limit the sources of the bleached kraft softwood chemical pul...

Embodiment 1

[0067] The pulp ratio is bleached kraft softwood chemical pulp (NBKP) and bleached kraft hardwood chemical pulp (LBKP). The weight ratio of the slurry is: NBKP35%; LBKP65%. ASA is used for sizing, the amount of ASA is 0.8kg / t paper, and the adding point is the screen inlet of the paper machine. The first surface sizing uses acrylic emulsion for surface sizing, the acrylic emulsion uses a solid content of 30%, and the amount of sizing is controlled at 5g / m 2 . The second surface sizing uses polydimethylsiloxane for surface sizing. The solid content of polydimethylsiloxane is 9%, and the amount of sizing is controlled at 0.6g / m 2 .

[0068] After the above two kinds of pulp are mixed, the mixed pulp is adjusted to a concentration of 3.0%, and it is subjected to thick pulp sieving, seasoning, punching, desanding and degassing, sizing, fine sieving, dehydration forming at the wire part, pressing, first drying, The first surface sizing, the second drying, the second surface siz...

Embodiment 2

[0072] The pulp ratio is bleached kraft softwood chemical pulp (NBKP) and bleached kraft hardwood chemical pulp (LBKP). The weight proportion of slurry is: NBKP31%; LBKP69%. ASA is used for sizing, the amount of ASA is 1.1kg / t paper, and the adding point is the screen inlet of the paper machine. The first surface sizing uses acrylic emulsion for surface sizing. The solid content of the acrylic emulsion is 35%, and the amount of sizing is controlled at 5.5g / m2. The second surface sizing uses polydimethylsiloxane for surface sizing. The solid content of polydimethylsiloxane is 8%, and the amount of sizing is controlled at 0.5g / m 2 .

[0073] After the above two kinds of slurry are mixed, the mixed slurry is adjusted to a concentration of 2.9%. After thickening, seasoning, pulping, desanding and degassing, sizing, fine sieving, dehydration forming at the wire part, pressing, first drying, The first surface sizing, the second drying, the second surface sizing, the third drying,...

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Abstract

The invention provides a preparation method of plastic-removed food paper, the preparation method comprises the following steps: mixing bleached sulfate needlebush chemical pulp and bleached sulfate broadleaf wood chemical pulp, carrying out thick pulp screening, blending, slushing, desanding and degassing, sizing, mixing with ASA, and carrying out fine screening to obtain pre-treated pulp; the pre-treated slurry is subjected to headbox treatment, net part dehydration forming, squeezing, first drying, first surface sizing, second drying, second surface sizing, third drying, press polishing and reeling, and the paper is prepared, wherein the first step of surface sizing comprises the step of carrying out surface sizing by adopting an acrylic emulsion; and in the second surface sizing step, polydimethylsiloxane is adopted for surface sizing. ASA sizing and surface sizing are adopted, migration of sizing liquid in the surface sizing section to paper can be reduced, and the film forming effect of the subsequent barrier material is ensured; the blocking layer is formed on the paper surface, so that the paper is ensured to obtain primary waterproof, moisture-proof and oil-proof blocking effects.

Description

technical field [0001] The invention relates to the technical field of paper products, in particular to a plastic-free food paper and a preparation method thereof. Background technique [0002] Solving plastic white pollution is a major and urgent issue facing all mankind. Substituting paper for plastic is one of the important ways to solve this problem. It is also becoming more and more abundant. Paper products that are water-resistant, oil-resistant, heat-resistant, acid-alkali-resistant, and easy to process are currently the focus of research and development of paper instead of plastic. At present, all kinds of oil-proof food bags, food mats, mouth cups, sauce cups, and dried fruit, tea, and jerky products on the market often use plastic coated products or all-plastic products, resulting in "white Pollution" is very serious. The annual domestic demand for this type of food paper is hundreds of thousands of tons. The packaging products used for these foods have high req...

Claims

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Application Information

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IPC IPC(8): D21H27/00D21H27/10D21H11/04D21F11/00D21H23/22D21H21/16
CPCD21H27/00D21H27/10D21H11/04D21F11/00D21H23/22D21H21/16
Inventor 刘春景史梦华董超朱宏伟李丹乐名菊谭桂香银辉姜云
Owner YUEYANG FOREST & PAPER CO LTD
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