Effects of Mould Temperature on Rice Bran-Based Bioplastics Obtained by Injection Moulding

Alonso‐González, María; Félix, Manuel; Guerrero, Antonio; Romero, Alberto

doi:10.3390/polym13030398

Cited by 22 publications

(19 citation statements)

References 34 publications

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“…This is confirmed by the results of the research in which the influence of increasing the mold temperature was studied. It was possible to obtain better strength properties [ 36 , 37 , 38 ], an example of this is the increase in strength of flexible hinges [ 39 ]. As well as aesthetic properties of the products [ 29 , 40 , 41 ].…”

Section: Discussionmentioning

confidence: 99%

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

et al. 2021

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In order to increase the quality of the products manufactured by injection molding, RTC technology can be used to achieve higher mold temperatures. As a result, the path of the injected melt can be extended, allowing the production of parts with more complex shapes and greater length. Induction heating allows heating only selected forming surfaces of the mold which increases the speed and efficiency of the process. This paper presents the concept of a detachable inductor integrated with sliders to enable the application of this technology in an injection mold with sliders, along with the theoretical model used to perform the tests. First, the effect of the magnetic concentrator shape on the process was analyzed. This was followed by a simulation study of the influence of process parameters: heating time, frequency, and electric current. An extensive analysis of the test results of the temperature distribution on the insert allowed for the selection of parameter sets that would enable obtaining the desired surface temperature without a major increase in process time. The results of simulation studies confirm the possible applications and present the range of parameters for obtaining the optimal process.

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Section: Discussionmentioning

confidence: 99%

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

et al. 2021

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“…The chemical composition of RB was already characterized by Alonso-González et al [ 13 ]. The approximate composition of DRB and FRB flours was determined following the approved methods of A.O.A.C.…”

Section: Methodsmentioning

confidence: 99%

“…All blends contained 55% active matter and 45% total plasticizer, maintaining the proportion of 2:1 water-G/S. The proportions were selected according to previous studies [ 13 , 14 ]. The blends were mixed at 200 rpm and 80 °C for 1 h. The systems are identified with the corresponding active matter (RB, DRB and FRB) and the plasticizer used (G or S).…”

Section: Methodsmentioning

confidence: 99%

“…It is a low-added-value by-product mainly used for animal feeding or as an organic fertilizer [ 12 ]. However, the proteins and starches present in rice bran have previously been used to develop rice bran-based bioplastics; their mechanical and functional properties depend on the processing parameters and composition [ 13 , 14 ]. This valorization turns rice bran into a high-added-value by-product, a new raw material, such as gluten or soybean flours [ 15 , 16 ], that can be used to produce biobased, biodegradable plastic, benefiting both the environment and the producing companies.…”

Section: Introductionmentioning

confidence: 99%

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Rice Bran-Based Bioplastics: Effects of Biopolymer Fractions on Their Mechanical, Functional and Microstructural Properties

2021

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Rice bran is an underutilized by-product of rice production, containing proteins, lipids and carbohydrates (mainly starches). Proteins and starches have been previously used to produce rice bran-based bioplastics, providing a high-added-value by-product, while contributing to the development of biobased, biodegradable bioplastics. However, rice bran contains oil (18–22%), which can have a detrimental effect on bioplastic properties. Its extraction could be convenient, since rice bran oil is becoming increasingly attractive due to its variety of applications in the food, pharmacy and cosmetic industries. In this way, the aim of this work was to analyze the effect of the different components of rice bran on the final properties of the bioplastics. Rice bran refining was carried out by extracting the oil and fiber fractions, and the effects of these two procedures on the final properties were addressed with mechanical, functional and microstructural measures. Results revealed that defatted rice bran produced bioplastics with higher viscoelastic moduli and better tensile behavior while decreasing the water uptake capacity and the soluble matter loss of the samples. However, no significant improvements were observed for systems produced from fiber-free rice bran. The microstructures observed in the SEM micrographs matched the obtained results, supporting the conclusions drawn.

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“…To perform the process correctly, the mold temperature must be slightly higher than the T g of the protein blend. Therefore, temperatures over 60 °C should be generally selected [ 97 , 136 ]. This processing technique does not require high flowability; therefore, the obtained materials can be reinforced satisfactorily with fibers [ 27 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 ].…”

Section: Processing Of Bio-based Materialsmentioning

confidence: 99%

Proteins from Agri-Food Industrial Biowastes or Co-Products and Their Applications as Green Materials

Álvarez‐Castillo¹,

Félix²,

Bengoechea³

et al. 2021

Foods

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A great amount of biowastes, comprising byproducts and biomass wastes, is originated yearly from the agri-food industry. These biowastes are commonly rich in proteins and polysaccharides and are mainly discarded or used for animal feeding. As regulations aim to shift from a fossil-based to a bio-based circular economy model, biowastes are also being employed for producing bio-based materials. This may involve their use in high-value applications and therefore a remarkable revalorization of those resources. The present review summarizes the main sources of protein from biowastes and co-products of the agri-food industry (i.e., wheat gluten, potato, zein, soy, rapeseed, sunflower, protein, casein, whey, blood, gelatin, collagen, keratin, and algae protein concentrates), assessing the bioplastic application (i.e., food packaging and coating, controlled release of active agents, absorbent and superabsorbent materials, agriculture, and scaffolds) for which they have been more extensively produced. The most common wet and dry processes to produce protein-based materials are also described (i.e., compression molding, injection molding, extrusion, 3D-printing, casting, and electrospinning), as well as the main characterization techniques (i.e., mechanical and rheological properties, tensile strength tests, rheological tests, thermal characterization, and optical properties). In this sense, the strategy of producing materials from biowastes to be used in agricultural applications, which converge with the zero-waste approach, seems to be remarkably attractive from a sustainability prospect (including environmental, economic, and social angles). This approach allows envisioning a reduction of some of the impacts along the product life cycle, contributing to tackling the transition toward a circular economy.

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Effects of Mould Temperature on Rice Bran-Based Bioplastics Obtained by Injection Moulding

Cited by 22 publications

References 34 publications

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

Design and Simulation Study of the Induction Heated Injection Mold with Sliders

Rice Bran-Based Bioplastics: Effects of Biopolymer Fractions on Their Mechanical, Functional and Microstructural Properties

Proteins from Agri-Food Industrial Biowastes or Co-Products and Their Applications as Green Materials

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