Preparation method for degradable white cardboard applied to food packaging

A technology for food packaging and white cardboard, applied in the field of papermaking, can solve the problems of the white cardboard being difficult to degrade, unfavorable to human health, difficult to recycle, etc., and achieves the effects of good degradation performance, enhanced surface strength, and improved bending resistance.

Inactive Publication Date: 2018-06-22
NOTTING CHANGZHOU PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide a degradable white cardboard for food packaging in view of the defects that the white cardboard used in the food packaging industry has poor antibacterial function, which is not conducive to human health, and the white cardboard is difficult to degrade and difficult to recycle. How to prepare cardboard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026]Soak 300g of corn in 400mL of sulfurous acid solution with a mass fraction of 0.8% for 6 hours, take out the soaked corn, and crush the corn in a disc crusher for 1 hour to obtain corn paste, pass the corn paste through a sieve with a diameter of 0.06 After centrifugal sieving of mm, the sieved corn paste was obtained, heated in an oven to 80°C, and dried for 4 hours to obtain coarse cornstarch; the coarse cornstarch was placed in a rake-type vacuum dryer, heated to 100°C, and vacuum Dry for 2 hours to obtain dry cornstarch, mix dry cornstarch, glycerin and water at a mass ratio of 10:5:1, place in a high-speed disperser and disperse at a speed of 3000r / min for 10min to obtain a dispersed starch material; put coniferous wood into The wood pulverizer was crushed for 30 minutes, passed through a 80-mesh standard sieve to obtain sieved wood powder, put the sieved wood powder in an oven at a temperature of 100°C and dried for 3 hours, and prepared a 20% mass fraction of Put ...

example 2

[0028] Soak 325g of corn in 450mL of sulfurous acid solution with a mass fraction of 0.8% for 7 hours, take out the soaked corn, put the corn in a disc crusher and crush it for 1.5 hours to obtain corn paste, pass the corn paste through a sieve with a diameter of After a 0.07mm centrifugal sieve, the sieved corn paste was obtained, heated in an oven to 83°C, and dried for 4.5 hours to obtain coarse cornstarch; put the coarse cornstarch in a rake-type vacuum dryer, and heated to 103°C , dried in vacuum for 2.5h to obtain dry cornstarch, mixed dry cornstarch, glycerol and water in a mass ratio of 10:5:1, placed in a high-speed disperser and dispersed for 13min at a speed of 3250r / min to obtain a dispersed starch material; Put the leaf wood into a wood crusher for 35 minutes, pass through an 80-mesh standard sieve to obtain sieved wood powder, put the sieved wood powder into an oven at a temperature of 110°C and dry for 4 hours, and use the dried sieved wood powder to prepare a ma...

example 3

[0030] Soak 350 g of corn in 500 mL of sulfurous acid solution with a mass fraction of 0.8% for 8 hours, take out the soaked corn, and crush the corn in a disc crusher for 2 hours to obtain corn paste, pass the corn paste through a sieve with a diameter of 0.08 After centrifugal sieving of mm, the sieved corn paste was obtained, heated in an oven to 85°C, and dried for 5 hours to obtain coarse cornstarch; the coarse cornstarch was placed in a rake-type vacuum dryer, heated to 105°C, and vacuum Dry for 3 hours to obtain dry cornstarch, mix dry cornstarch, glycerin and water in a mass ratio of 10:5:1, place in a high-speed disperser and disperse at a speed of 3500r / min for 15min to obtain a dispersed starch material; put coniferous wood into The wood pulverizer was crushed for 50 minutes, passed through an 80-mesh standard sieve to obtain sieved wood powder, and the sieved wood powder was put into an oven at a temperature of 120°C to dry for 5 hours, and the dried sieved wood pow...

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Abstract

The invention specifically relates to a preparation method for a degradable white cardboard applied to food packaging, belonging to the technical field of papermaking. According to the invention, a self-made mixed base material, the self-made disperse starch material and lactic acid bacteria are subjected to mixed fermentation, and a fermentation product is centrifuged to obtain a viscous precipitate; the viscous precipitate and homemade ura sedge fibers are subjected to mixing and papermaking to obtain a top paper layer; shell powder is sprayed onto the top paper layer, and then calendering is carried out to obtain the degradable white cardboard; the used ura sedge fibers can act on the cell walls and the plasmalemmas of bacteria to prevent nutrients from being transported into cells; polylactic acid contained in the white cardboard has antibacterial and mildew-resistant functions, so the white cardboard has excellent antibacterial properties; polylactic acid also has the characteristics of softness and toughness, so the bending resistance of white cardboard can be improved; and a polylactic acid main chain in the white cardboard contains easily-hydrolyzable ester bonds, and polylactic acid belongs to polyester polymer materials, so the white cardboard has good degradation performance, is of great significance in environmental protection, and shows good application prospects.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a preparation method of degradable white cardboard for food packaging. Background technique [0002] Paper is a great invention in ancient my country, which provided the foundation of material technology for the prosperity of ancient Chinese culture, and the appearance of paper brought great convenience to human life and study. [0003] White cardboard is a thicker, white cardboard made of pure high-quality wood pulp. It is a kind of paper made by calendering or embossing. It has relatively uniform ink absorption, higher stiffness, and better Excellent burst resistance and good smoothness. White cardboard is a widely used packaging paper. It is mainly used for product packaging boxes, product surface linings, picture wall charts, etc. In addition, it is also used for business card printing, certificates, invitations, covers, desk calendars, postal postcards, etc. [0004] H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/10D21H11/00D21H11/12D21H17/28D21H17/06D21H17/26D21H17/00D21H19/38D21H19/44D21B1/02D21C3/02D21H21/36D21H21/18D21H21/14
CPCD21H27/10D21B1/021D21C3/02D21H11/00D21H11/12D21H17/005D21H17/06D21H17/26D21H17/28D21H19/385D21H19/44D21H21/14D21H21/18D21H21/36
Inventor 龙仕君何少雄张建初
Owner NOTTING CHANGZHOU PRECISION MACHINERY
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