Transparency of polymeric food packaging materials

Guzmán-Puyol, Susana; Benı́tez, José J.; Heredia‐Guerrero, José A.

doi:10.1016/j.foodres.2022.111792

Cited by 88 publications

(44 citation statements)

References 73 publications

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“…Opacity of a material is an indication of light transmission: the higher the opacity, the lower the amount of light that passes through the material. For food packaging applications, this is usually done in the visible range (400–800 nm) [ 36 ]. In this work, the method used by Farhan and Hani [ 37 ] was adopted; a similar method was used by others [ 38 , 39 , 40 , 41 ], which was based on the ASTM method D1746-92 [ 42 ].…”

Section: Methodsmentioning

confidence: 99%

Bilayer Films of Poly(lactic acid) and Cottonseed Protein for Packaging Applications

et al. 2023

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Poly(lactic acid) (PLA) is a common biobased film-former made from renewable biomass, such as polysaccharides from sugarcane, corn, or cassava. It has good physical properties but is relatively expensive when compared to the plastics used for food packaging. In this work, bilayer films were designed, incorporating a PLA layer and a layer of washed cottonseed meal (CSM), an inexpensive agro-based raw material from cotton manufacturing, where the main component is cottonseed protein. These bilayer films were made through the solvent casting method. The combined thickness of the PLA/CSM bilayer film was between 47 and 83 μm. The thickness of the PLA layer in this film was 10%, 30%, or 50% of the total bilayer film’s thickness. Mechanical properties of the films, opacity, water vapor permeation, and thermal properties were evaluated. Since PLA and CSM are both agro-based, sustainable, and biodegradable, the bilayer film may be used as an eco-friendlier food packaging material, which helps reduce the environmental problems of plastic waste and microplastics. Moreover, the utilization of cottonseed meal may add value to this cotton byproduct and provide a potential economic benefit to cotton farmers.

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Section: Methodsmentioning

confidence: 99%

Bilayer Films of Poly(lactic acid) and Cottonseed Protein for Packaging Applications

et al. 2023

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“…As a control, a poly(lactic acid) (PLA) film with a similar thickness was also evaluated. PLA was chosen because it is the most utilized biodegradable polymer on the food packaging market, and it is known to have high visible transparency . As illustrated in Figure B–D, the lignin films have superior UV barrier properties as compared to PLA with T 280 < 0.01% and a reasonable transmittance of ∼60% in the visible wavelength region.…”

Section: Resultsmentioning

confidence: 99%

Ductile, High-Lignin-Content Thermoset Films and Coatings

Boarino,

Charmillot,

Figueirêdo

et al. 2023

ACS Sustainable Chem. Eng.

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In the context of transitioning toward a more sustainable use of natural resources, the application of lignin to substitute commonly utilized petroleum-based plastics can play a key role. Although lignin is highly available at low cost and presents interesting properties, such as antioxidant and UV barrier activities, its application is limited by its low reactivity, which is a consequence of harsh conditions normally used to extract lignin from biomass. In this work, the use of glyoxylic acid lignin (GA lignin), rich in carboxylic acid groups and hence highly reactive toward epoxy cross-linkers, is presented. GA lignin, which is directly extracted from biomass via a one-step aldehyde-assisted fractionation process, allowed the preparation of thermoset films and coatings via a simple reaction with sustainable poly(ethylene glycol) diglycidyl ether and glycerol diglycidyl ether cross-linkers. This allows one to prepare freestanding films containing up to 70 wt % lignin with tunable mechanical properties and covalently surface-attached coatings containing up to 90 wt % lignin with high solvent resistance. Both films and coatings display antioxidant properties and combine excellent UV barrier activity with high visible transparency, which is attractive for applications in sustainable food packaging.

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“…The transparency was determined from the transmittance spectra, and the value was taken at 600 nm, which is commonly used to present transparency of materials. [ 39,40 ] in the visible range. As seen from Figure A, the values at 600 nm for all R ratios are in the range of 74–83%.…”

Section: Resultsmentioning

confidence: 99%

3D Printing Transparent γ‐Alumina Porous Structures Based on Photopolymerizable Sol–Gel Inks

Moshkovitz

Paz

Magdassi

2023

Adv Materials Technologies

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A novel method for fabricating transparent porous γ‐alumina 3D structures by printing at high resolution is presented. The process is based on combining digital light processing 3D printing (DLP) and sol–gel reactions, all performed in transparent solutions, resulting in ceramic monolithic porous structures. The aqueous printing solution contains mainly aluminum chloride, propylene oxide (PO), ethanol, and acrylic acid (AA). The printed polymerized structures are aged, followed by supercritical drying (SCD), and sintered at high temperatures. During aging and sintering, the printed objects shrink, thus enabling a final printing resolution far beyond the nominal value of the used printer. The resulting structures are crystalline γ‐Al2O3, with a very high surface area, above 1800 m2 g−1, and optical transmission above 80% at 600 nm. In addition, SCD enables precise control of pores’ dimensions and total surface area, which are essential for applications including thermal insulation and catalyst support and for obtaining heat‐resistant transparent optical devices.

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Transparency of polymeric food packaging materials

Cited by 88 publications

References 73 publications

Bilayer Films of Poly(lactic acid) and Cottonseed Protein for Packaging Applications

Bilayer Films of Poly(lactic acid) and Cottonseed Protein for Packaging Applications

Ductile, High-Lignin-Content Thermoset Films and Coatings

3D Printing Transparent γ‐Alumina Porous Structures Based on Photopolymerizable Sol–Gel Inks

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