Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications
A new approach to the creation of polypropylene (PP) based foaming materials was developed using food grade foaming agents that were coated on the PP pellets. More specifically, sodium bicarbonate and organic acids were used to coat PP pellets using either polyethyleneoxide (PEO) or lipid esters as...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/2/288 |
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| author | Artemis Tsagdi Ioannis Drossos Despoina Georgiou Stylianos Exarhopoulos Georgios Karasiotas Joannis K. Kallitsis Eleni P. Kalogianni |
| author_facet | Artemis Tsagdi Ioannis Drossos Despoina Georgiou Stylianos Exarhopoulos Georgios Karasiotas Joannis K. Kallitsis Eleni P. Kalogianni |
| author_sort | Artemis Tsagdi |
| collection | DOAJ |
| description | A new approach to the creation of polypropylene (PP) based foaming materials was developed using food grade foaming agents that were coated on the PP pellets. More specifically, sodium bicarbonate and organic acids were used to coat PP pellets using either polyethyleneoxide (PEO) or lipid esters as coating stabilizers. In order to overcome the problem of the thermal decomposition of sodium bicarbonate at temperatures lower than the PP melting temperature, which makes the direct foaming during melt mixing impossible, the proposed methodology was proved quite efficient. Thus, new PP masterbatches were prepared, where the foaming agents were incorporated as coating at PP pellets at contents up to 10%, and initially used in Lab scale injection machines in order to find the best combination of materials that resulted in the production of foamed articles. Subsequently selected material combinations were tested in an industrial scale injection molding machine, where an optimization of the injection parameters was attempted. The outcome of this was the production of PP articles with significantly increased void fraction, up to 14%, decreased thermal conductivity, up to 20%, and various pore sizes as was observed via microscopic examination using SEM and CLSM. |
| first_indexed | 2024-03-09T04:30:09Z |
| format | Article |
| id | doaj.art-ba5d8eae03aa4d0c8c1e6829f6391df4 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T04:30:09Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-ba5d8eae03aa4d0c8c1e6829f6391df42023-12-03T13:37:05ZengMDPI AGPolymers2073-43602021-01-0113228810.3390/polym13020288Injection Molded PP Foams Using Food Ingredients for Food Packaging ApplicationsArtemis Tsagdi0Ioannis Drossos1Despoina Georgiou2Stylianos Exarhopoulos3Georgios Karasiotas4Joannis K. Kallitsis5Eleni P. Kalogianni6Department of Chemistry, University of Patras, GR-26504 Patras, GreeceThrace Plastics Pack S.A., Member of Thrace Group Companies, GR-67100 Magiko Xanthi, GreeceDepartment of Food Science and Technology, International Hellenic University, GR-57001 Thermi, GreeceDepartment of Food Science and Technology, International Hellenic University, GR-57001 Thermi, GreeceThrace Plastics Pack S.A., Member of Thrace Group Companies, GR-67100 Magiko Xanthi, GreeceDepartment of Chemistry, University of Patras, GR-26504 Patras, GreeceDepartment of Food Science and Technology, International Hellenic University, GR-57001 Thermi, GreeceA new approach to the creation of polypropylene (PP) based foaming materials was developed using food grade foaming agents that were coated on the PP pellets. More specifically, sodium bicarbonate and organic acids were used to coat PP pellets using either polyethyleneoxide (PEO) or lipid esters as coating stabilizers. In order to overcome the problem of the thermal decomposition of sodium bicarbonate at temperatures lower than the PP melting temperature, which makes the direct foaming during melt mixing impossible, the proposed methodology was proved quite efficient. Thus, new PP masterbatches were prepared, where the foaming agents were incorporated as coating at PP pellets at contents up to 10%, and initially used in Lab scale injection machines in order to find the best combination of materials that resulted in the production of foamed articles. Subsequently selected material combinations were tested in an industrial scale injection molding machine, where an optimization of the injection parameters was attempted. The outcome of this was the production of PP articles with significantly increased void fraction, up to 14%, decreased thermal conductivity, up to 20%, and various pore sizes as was observed via microscopic examination using SEM and CLSM.https://www.mdpi.com/2073-4360/13/2/288polypropylenecoating processfoamed PPfoaming agentsfood ingredients |
| spellingShingle | Artemis Tsagdi Ioannis Drossos Despoina Georgiou Stylianos Exarhopoulos Georgios Karasiotas Joannis K. Kallitsis Eleni P. Kalogianni Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications Polymers polypropylene coating process foamed PP foaming agents food ingredients |
| title | Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications |
| title_full | Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications |
| title_fullStr | Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications |
| title_full_unstemmed | Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications |
| title_short | Injection Molded PP Foams Using Food Ingredients for Food Packaging Applications |
| title_sort | injection molded pp foams using food ingredients for food packaging applications |
| topic | polypropylene coating process foamed PP foaming agents food ingredients |
| url | https://www.mdpi.com/2073-4360/13/2/288 |
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