Preparation method of paper-based packaging material with ultraviolet shielding function

A packaging material and outer shielding technology, applied in pulp beating method, pulp beating/refining method, paper coating, etc., can solve the problems of color fading, product deterioration appearance, ugly, etc., to improve crystal growth and paper quality indicators Improve the effect of good surface stress

Active Publication Date: 2020-12-04
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sunlight and light from storage room lighting will cause color fading of food, chem

Method used

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  • Preparation method of paper-based packaging material with ultraviolet shielding function
  • Preparation method of paper-based packaging material with ultraviolet shielding function
  • Preparation method of paper-based packaging material with ultraviolet shielding function

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1: The preparation method of paper-based packaging material with ultraviolet shielding function is carried out according to the following steps: 9 parts of cellulase with enzyme activity index of 2,800 U, 6 parts of pectinase with enzyme activity index of 2,400 U and 5 parts of xylanase with enzyme activity index of 3,300 U are used to prepare composite biological enzyme; Then, 70 parts of softwood pulp board and 30 parts of hardwood pulp board are put into a pulper, and a proper amount of water is added to dissolve the pulp boards to form pulp, and the water temperature is 25℃. Then, the relative absolute dry pulp boards (i.e. the absolute dry mass of the mixed pulp boards in the pulper after water removal) are added into the raw material solution; The ratio of relative absolute dry mass of softwood pulp board and hardwood pulp board is a conventional parameter, which can be multiplied by the weight of softwood pulp board or hardwood pulp board to calculate the wei...

Example Embodiment

[0041] Example 2: The preparation method of paper-based packaging material with ultraviolet shielding function is carried out according to the following steps: according to the mass parts, 8 parts of cellulase with enzyme activity index of 2,500 U, 5 parts of pectinase with enzyme activity index of 2,500 U and 5 parts of xylanase with enzyme activity index of 3,500 U, a compound biological enzyme agent is prepared; Then, 73 parts of softwood pulp board and 27 parts of hardwood pulp board are put into a pulper, and a proper amount of water is added to dissolve the pulp board to form pulp at 25℃. Then, 600ppm of compound biological enzyme is added into the raw material solution for defibering for 15min, and the defibering pulp is sent to a refiner for pulping, with a total power of 270kw / h, a beating concentration of 3.5% and a beating degree of 30%. Follow-up operation is carried out on the treated pulp according to the conventional process, that is, the pulp is diluted, screened, ...

Example Embodiment

[0042] Example 3: On the basis of Example 2, after coating, the coated base paper is put into an air pressure treatment tank, and the air pressure is controlled according to the standing time. The relationship is:

[0043] Where: P is air pressure and T is time.

[0044] For example, in Example 2, in the process of standing for 4 seconds after coating, the air pressure increased from 1MPa to 2MPa in the process of 0-2 seconds, and then decreased from 2MPa to 1MPa in the process of 2-4 seconds.

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Abstract

The invention discloses a preparation method of a paper-based packaging material with an ultraviolet shielding function. The preparation method comprises the steps of S1, preparing a composite biological enzyme agent; S2, preparing a mixed pulp board from 70-80 parts by weight of softwood pulp boards and 20-30 parts by weight of hardwood pulp boards, adding the mixed pulp board into a pulper, thenadding the composite biological enzyme agent which is 500ppm-1000ppm relative to the weight of the absolute dry pulp board, and defibering for 5-30 minutes to obtain mixed pulp; S3, feeding the mixedpulp into a refiner, and pulping until the pulping degree is 20-45 degrees SR when the pulping concentration is 3%-4%; and S4, sequentially carrying out dilution, screening, purification, net forming, squeezing and drying processes on the paper pulp to obtain raw paper, then putting the raw paper in a vacuum environment to discharge air in pores of the raw paper, carrying out coating treatment onthe surface of the raw paper by using an ultraviolet shielding material, drying at the temperature of 60-100 DEG C after coating, and standing for 1-8 seconds to obtain a finished product. Accordingto the invention, the paper-based packaging material not only has beneficial ultraviolet shielding capability, but also has good strength and excellent physical properties.

Description

technical field [0001] The invention relates to a method for preparing a paper-based packaging material with an ultraviolet shielding function, belonging to the field of papermaking. Background technique [0002] In recent years, with the development of e-commerce, domestic paper-based packaging materials have developed rapidly. Paper-based packaging materials have good appearance and printability, and can be used for the protection of high-end consumer goods, medicines, reagents, precision instruments and daily necessities. , which can not only meet product packaging requirements, but also have special functions of paper-based packaging materials are in line with national strategies, economic development and the development needs of the paper industry. [0003] With the rapid development of science and technology and the increasing awareness of environmental protection, the functionality of packaging lies not only in the design of the packaging structure, but also in the se...

Claims

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Application Information

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IPC IPC(8): D21B1/34D21D1/20D21D1/02D21F11/00D21H23/22D21C5/00D21H19/42D21H19/38D21H17/00
CPCD21B1/345D21D1/20D21D1/02D21F11/00D21H23/22D21C5/005D21H19/42D21H19/385D21H17/00
Inventor 刘蓓郭大亮沙力争张金猛赵会芳李静许银超
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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