In this number:
Optimal design of double-walled corrugated packaging.
Designing corrugated packaging is a real challenge, especially when the packaging material comes from multiple recycles. Recycling itself is a pro-ecological and absolutely necessary process, but the mechanical properties of the materials that are processed many times deteriorate with the number of cycles. Manufacturers are trying to use unprecedented design methods to preserve the bearing capacity of the packaging, even when the material itself is of deteriorated quality. A further obstacle in the design process of the paper packaging structure is the progressive systematic reduction of the grammage (the so-called light process) of the corrugated board. Therefore, this research presents a critical look at the optimal corrugated board selection process for packaging structures, depending on the paper used.
Manufacturing and characterization of transparent and uniform composite cellulose / polyethylene films from disposable paper cups used by the “One-Pot method”.
Disposable paper cups are usually made of high quality cardboard and polyethylene liners and are widely used in daily life. However, most disposable paper cups are only used for a short time and then incinerated or landfilled at the end of their service due to the difficulty of separating the components, leading to a serious threat to our ecosystem. Therefore, developing an easy and green method to recycle and reuse disposable paper cups is vital.
Advances in biodegradable active films for food packaging: effects of incorporation of nano / microcapsules.
Food packaging plays a vital role in the modern food industry as the primary process for preserving the quality of food products from production to consumption. New food packaging technologies formulated with natural compounds are being developed by replacing synthetic / chemical antimicrobial and antioxidant agents to meet consumer expectations for healthy food. The strategy of incorporating natural antimicrobial compounds into food packaging facilities is a recent and promising technology for achieving this goal. Concepts such as “biodegradable packaging”, “active packaging” and “bioactive packaging” currently drive research and development of food packaging.
Plastic waste recycling, with a focus on thermal methods: review.
In this article, the authors addressed the recycling of plastic waste. Mechanical recycling involves shredding waste in order to obtain a recycle or regranulate that meets specific quality requirements. Chemical recycling consists in the degradation of the material into low molecular weight compounds, and can take place in the processes of hydrolysis, glycolysis, methanolosis by means of chemical solvents, and during thermal processes of hydrocracking, gasification, pyrolysis, combustion, allowing the recovery of hydrocarbons gaseous and liquid, founding in application as a fuel in the energy and cement-lime industry and allowing the recovery of thermal energy contained in the plastics. The paper focuses on thermal plastic recycling methods that become more important due to legal regulations restricting landfilling of waste.
Reinforcement of the CaO-ZrO2-MgO ceramic matrix with coarse Al2O3 particles.
A thermal protection system is subjected to high forces, particularly compression, bending and wear, to aggressive environments of high temperatures, high velocity gases and particle shocks. Typically, ceramic materials appear as a first barrier or external shield on a metal substrate responsible for the structure. When it comes to a coating due to the small thickness, the particles of the feedstock are sub-micron scale, but when a shield is built with a few centimeters its structural and economic feasibility requires the use of larger particle size distributions. In this work, a fine-grained ceramic matrix of CaO-ZrO2-MgO was reinforced with commercial coarse Al2O3 particles.
Characterization of potential pollutants by poly (lactic) acid after the degradation process in the soil under simulated environmental conditions.
In recent years, the amount of petrochemical plastic waste produced has grown at an alarming rate. According to the Plastics Europe Market Research Group (PEMRG) / Conversio Market & Strategy GmbH, global plastics production amounted to 359 million tonnes in 2018 and 61.8 million tonnes in Europe. More than 80% of all marine litter is plastic, which accumulates in the environment due to its durability. Due to the growing problem, biodegradable polymer products are introduced to the market. Therefore, it is necessary to conduct research on degradation products in order to estimate the risk deriving from their presence in the environment. This paper discusses research on compounds that can potentially remain in the soil after degradation of the green PLA double polymer.
Packaging design to protect Hongmeiren orange fruit from mechanical damage during simulated and road transport.
Hongmeiren is a high quality orange fruit but susceptible to mechanical damage. This work proposes a new packaging format (Packaging C), which uses plastic dividing panels to separate the collapsible plastic basket to prevent the fruits from crushing each other, and uses a layer of PU foam and places it along the Inner EPE foam layer to meet different fruit size. The results show that under both 3 and 10 hours of simulated transportation, packaging C achieved much lower damage and decay rates than packaging A (plastic bulk containers), and this was further verified by transportation. on the road. Also, packaging C could avoid dents in the peel of some large fruits compared to the gift box (Packaging B).