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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, chemical reagents and other items, product deterioration and unsightly appearance, etc.

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

Embodiment 1

[0040]Embodiment 1: The preparation method of the paper-based packaging material with ultraviolet shielding function is carried out according to the following steps: 9 parts of cellulase with an enzyme activity index of 2800U, 6 parts of pectinase with an enzyme activity index of 2400U and enzyme activity in parts by mass 5 parts of xylanase with an index of 3300U are used to prepare a compound biological enzyme agent; then 70 parts of softwood pulp boards and 30 parts of hardwood pulp boards are put into the pulper, and an appropriate amount of water is added to dissolve the pulp boards to form pulp. The water temperature is 25°C , then add the relative absolute dry mass of the pulp board in the raw material solution (i.e. the absolute dry mass of the mixed pulp board in the pulper after removing water; the ratio of the relative dry mass of the softwood pulp board and the hardwood pulp board is a conventional parameter, It can be multiplied by the weight of the softwood pulp b...

Embodiment 2

[0041] Embodiment 2: The preparation method of the paper-based packaging material with ultraviolet shielding function is carried out according to the following steps: 8 parts of cellulase with an enzyme activity index of 2500U, 5 parts of pectinase with an enzyme activity index of 2500U and enzyme activity in parts by mass 5 parts of xylanase with an index of 3500U are used to prepare a compound biological enzyme agent; then 73 parts of softwood pulp boards and 27 parts of hardwood pulp boards are put into the pulper, and an appropriate amount of water is added to dissolve the pulp boards to form pulp. The water temperature is 25 °C , and then add a compound biological enzyme agent of 600ppm relative to the dry pulp board weight in the raw material solution to decompose. The decompression time is 15min. The pulp after decompression is sent to the refiner for beating. The total power of the defibrination is 270kw / h. It is 3.5%, beating until the degree of beating is 38 ° SR, and...

Embodiment 3

[0042] Embodiment 3: on the basis of embodiment 2, after coating, the base paper after coating is put into air pressure treatment tank, controls air pressure according to standing time, relational formula is:

[0043] Where: P is air pressure, t is time.

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

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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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