Microwave heating performances of low density polyethylene (LDPE) plastic particles

Hong, Kun; Fu, Wenming; Guang, Mengmeng; Zhang, Yaning; Li, Bingxi

doi:10.1016/j.jaap.2021.105356

Cited by 26 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was observed that larger chamber volume, more feeding load, and higher microwave power may result in a faster heating rate of HDPE. Similar results were observed by Hong et al [55], which explored the heating performance of low density polyethylene (LDPE). They found that more feeding load and higher microwave power may improve the heating rate of LDPE, while larger chamber volume resulted in a lower heating rate of LDPE.…”

Section: Introductionsupporting

confidence: 85%

Efficient Heating of Activated Carbon in Microwave Field

Shi

et al. 2023

Self Cite

View full text Add to dashboard Cite

Activated carbon (AC) is widely utilized in water treatment, gas adsorption, and purification as well as the protection of environment due to the characteristics of prominent catalytic and adsorbent effect. The heating performances are therefore of significant importance for the further applications. The main objective of this study was therefore to detail the heating performance of activated carbon in microwave field, and the factors affecting the heating performance were also explored. In this study, the heating performance of AC as affected by microwave power (400, 450, 500, 550, and 600 W), feeding load (5, 10, 15, 20, and 25 g), and reactor volume (50, 100, 150, 200, and 250 mL) were detailed and reported. The results showed that when the microwave powers were 400, 450, 500, 550, and 600 W, the temperatures of AC increased to the desired value (about 200 °C) within 90, 85, 70, 60, and 35 s with average heating rates of 2.0, 2.2, 2.8, 3.0, and 5.9 °C/s, respectively. When the feeding loads were 5, 10, 15, 20, and 25 g, the temperatures of AC increased to desired temperature within 40, 70, 60, 50, and 50 s with average heating rates of 4.2, 2.8, 3.1, 3.50, and 3.55 °C/s, respectively. When the reactor volumes were 50, 100, 150, 200, and 250 mL, the temperatures of AC increased to the desired temperature within 25, 60, 70, 70, and 160 s with average heating rates of 7.6, 3.3, 2.8, 2.6, and 1.2 °C/s, respectively. In general, the faster heating rate of activated carbon was achieved at higher microwave power, more feeding load, and smaller reactor volume. Fitting formulae were given to predict the transient temperatures of AC in the microwave field, and the relative errors were in the ranges of −15.4~12.4%, −15.4~13.5% and −18.7~12.4% at different microwave powers, feeding loads, and reactor volumes, respectively.

show abstract

Section: Introductionsupporting

confidence: 85%

Efficient Heating of Activated Carbon in Microwave Field

Shi

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, Hong et al reported the microwave heat of low-density polyethylene (LDPE) plastic particles. With the input p from 500 W to 900 W, the average heating rate of LDPE particles rises fro 4.89 K/min [22]. Another method is to apply ridged waveguide as an ap waveguide is a waveguide enhancing the electric field in the ridge regio be used to design ridged waveguide applicators of microwave heating an to treat some materials in sheet, filamentary, or cylindrical form due to it and uniformity [24,25].…”

Section: Theory Of the Double-ridged Waveguidementioning

confidence: 99%

“…For instance, Hong et al reported the microwave heating performance of low-density polyethylene (LDPE) plastic particles. With the input power increasing from 500 W to 900 W, the average heating rate of LDPE particles rises from 2.34 K/min to 4.89 K/min [22]. Another method is to apply ridged waveguide as an applicator.…”

Section: Introductionmentioning

confidence: 99%

Efficient Microwave Processing of Thin Films Based on Double-Ridged Waveguide

et al. 2023

View full text Add to dashboard Cite

Microwave heating has a wide range of applications in the fields of industrial heating and drying. However, when microwave heating is applied to the thin film, it will be challenging due to its low loss and large heat dissipation area. In this paper, a double-ridged waveguide for thin-film heating is proposed. The double ridge structure is employed to enhance the electric field, thereby increasing the power-loss density in the thin film. Firstly, a double-ridged waveguide, in which the electric field strength can be about 2.5 times that of the conventional waveguide, was designed based on the transverse resonance method and the electromagnetic field simulation. Then, a multiphysics model was built to analyze the heating performance of the ridged waveguide, in which the electromagnetic field and heat transfer are coupled. The simulation results show that the heating performance of the proposed waveguide will be 35.0 times that of the conventional waveguide. An experiment was carried out to verify the proposed model, showing that the experimental results are in accordance with the simulation results. Finally, the influences of the thickness of the film, the permittivity, the distance between two ridges, and the working state on heating performance and heating uniformity were also discussed.

show abstract

“…In general, plastics are widely used materials in food packaging industry due to its advantages such as easy shaping, low cost, good strength, and good barrier properties. − Among various plastics, polypropylene (PP), polyethylene (PE), and polycyclohexane-1,4-dimethylene terephthalate (PCT) are widely used as microwavable containers. Polycyclohexane-1,4-dimethylene terephthalate (PCT) and polycarbonate (PC) were also used for microwavable food packaging due to their good heat resistance.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Migration of Substances from Microwavable Plastic Food Containers into Food by Microwave and Conventional Heating

Shin,

Kim,

Kim

et al. 2024

ACS Food Sci. Technol.

View full text Add to dashboard Cite

In this study, the migration of substances from food contact plastics to food was compared between microwave and conventional heating. Overall and specific migrated substances including overall migrants (OMs), lead (Pb), antimony (Sb), 1hexene, 1-octene, terephthalic acid, isophthalic acid, and bisphenol A from the microwavable plastics were investigated. Safety assessments were performed by comparing the estimated daily intakes with the health-based guidance values. Migration tests were carried out using food simulants of 4% acetic acid, water, and 20% ethanol corresponding to the acidic, aqueous, and fatty foods, respectively. As a result, concentrations of OMs were 4.3−7.8 and 4.8−7.7 mg/L on average when using microwave and conventional heating methods, respectively. Moreover, all of the microwavable plastic food containers analyzed here met the current regulatory limits in Korea. It was assessed that there were no statistically significant differences (p > 0.05) between microwave and conventional heating methods for the studied test items. In addition, the dietary exposures of the specific migrated substances from the microwavable plastic materials (polyethylene, polypropylene, polycyclohexane-1,4-di-methylene terephthalate, and polycarbonate) were considered as safe. Although there are limitations of experimental methodology in this study, the current results showed that there is no need to be concerned about the use of microwavable plastic food containers in Korea.

show abstract

Microwave heating performances of low density polyethylene (LDPE) plastic particles

Cited by 26 publications

References 28 publications

Efficient Heating of Activated Carbon in Microwave Field

Efficient Heating of Activated Carbon in Microwave Field

Efficient Microwave Processing of Thin Films Based on Double-Ridged Waveguide

A Comparative Study on the Migration of Substances from Microwavable Plastic Food Containers into Food by Microwave and Conventional Heating

Contact Info

Product

Resources

About