US 12,344,764 B2
Method for preparing antibacterial and fresh-keeping fruit-packaging material through three-dimensional printing
Zhihua Li, Jiangsu (CN); Xiaowei Huang, Jiangsu (CN); Xiaobo Zou, Jiangsu (CN); Liuzi Du, Jiangsu (CN); Jiyong Shi, Jiangsu (CN); Zhikun Yang, Jiangsu (CN); Shaoyi Cen, Jiangsu (CN); Junjun Zhang, Jiangsu (CN); Ning Zhang, Jiangsu (CN); and Wei Sun, Jiangsu (CN)
Assigned to Jiangsu University, Jiangsu (CN)
Appl. No. 18/681,852
Filed by Jiangsu University, Jiangsu (CN)
PCT Filed Sep. 14, 2023, PCT No. PCT/CN2023/118762
§ 371(c)(1), (2) Date Feb. 6, 2024,
PCT Pub. No. WO2024/046488, PCT Pub. Date Mar. 7, 2024.
Claims priority of application No. 202211057354.0 (CN), filed on Aug. 31, 2022.
Prior Publication US 2025/0136825 A1, May 1, 2025
Int. Cl. C09D 5/14 (2006.01); B29C 64/118 (2017.01); B29K 27/06 (2006.01); B29K 105/00 (2006.01); B29L 31/00 (2006.01); B33Y 70/10 (2020.01); B65D 81/24 (2006.01); B65D 85/34 (2006.01); C09D 105/00 (2006.01); C09D 127/06 (2006.01)
CPC C09D 5/14 (2013.01) [B33Y 70/10 (2020.01); B65D 81/24 (2013.01); B65D 85/34 (2013.01); C09D 105/00 (2013.01); C09D 127/06 (2013.01); B29C 64/118 (2017.08); B29K 2027/06 (2013.01); B29K 2105/0035 (2013.01); B29K 2105/0038 (2013.01); B29L 2031/712 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for preparing an antibacterial and fresh-keeping fruit-packaging material through three-dimensional (3D) printing, comprising the following steps:
(1) preparation of a core layer solution: dissolving gum arabic in deionized water to obtain a gum arabic solution with a mass concentration of 10% to 15%; dissolving pullulan in deionized water to obtain a pullulan solution with a mass concentration of 10% to 15%; subjecting a probiotic to inoculation and cultivation, centrifugation, and resuspension to obtain a bacterial suspension with a bacterial concentration of 109 lg to 1010 lg (CFU/g); and mixing the bacterial suspension, the gum arabic solution, and the pullulan solution in a mass ratio of 1: (3-4): (1-3), and sealing and stirring a resulting mixed solution to obtain the core layer solution;
(2) preparation of a shell layer solution: mixing polyvinyl chloride, a modifier, and a plasticizer, and thoroughly stirring a resulting mixture to obtain the shell layer solution, wherein the polyvinyl chloride, the modifier, and the plasticizer are mixed in a mass ratio of 100: (5-10): (20-30) and the modifier is chlorinated polyethylene; and
(3) preparation of the antibacterial and fresh-keeping fruit-packaging material: with the shell layer solution and the core layer solution as 3D printing solutions, conducting coaxial 3D printing and uniaxial 3D printing as follows:
injecting the shell layer solution obtained in the step (2) and the core layer solution obtained in the step (1) into two syringes, respectively; conducting the coaxial 3D printing with a propulsion rate of the shell layer solution greater than a propulsion rate of the core layer solution to finally obtain a coaxial 3D printing product with a core-shell structure on a bottom plate of a device; and
conducting the uniaxial 3D printing with the shell layer solution alone to form an outer layer on the core-shell structure of the coaxial 3D printing product to obtain the antibacterial and fresh-keeping fruit-packaging material with inner and outer layers, wherein the inner layer is used for keeping fruits fresh and the outer layer is used for protection of the fruits.