Extrusion

Blackburn, S.; Szymiczek, Marcin

doi:10.1016/b978-0-12-803581-8.12098-3

Cited by 5 publications

(5 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The extrusion process is a crucial process of E3DCP wherein the concrete undergoes plastic deformation by passing through an outlet to obtain the desired cross-section profile [ 15 ]. To ensure a successful extrusion process, the process requirement of extrusion (i.e., extrudability, which describes the capability of fresh cementitious paste (FCP) to be extruded smoothly throughout the outlet without considerable cross-sectional deformation and with an acceptable degree of splitting/tearing of filament [ 12 , 16 ]) has to be fulfilled.…”

Section: Extrusion Process and Extruder Systemmentioning

confidence: 99%

A Review of the Extruder System Design for Large-Scale Extrusion-Based 3D Concrete Printing

et al. 2023

View full text Add to dashboard Cite

Extrusion-based 3D concrete printing (E3DCP) has been appreciated by academia and industry as the most plausible candidate for prospective concrete constructions. Considerable research efforts are dedicated to the material design to improve the extrudability of fresh concrete. However, at the time of writing this paper, there is still a lack of a review paper that highlights the significance of the mechanical design of the E3DCP system. This paper provides a comprehensive review of the mechanical design of the E3DCP extruder system in terms of the extruder system, positioning system and advanced fittings, and their effects on the extrudability are also discussed by relating to the extrusion driving forces and extrusion resistive forces which may include chamber wall shear force, shaping force, nozzle wall shear force, dead zone shear force and layer pressing force. Moreover, a classification framework of the E3DCP system as an extension of the DFC classification framework was proposed. The authors reckoned that such a classification framework could assist a more systematic E3DCP system design.

show abstract

Section: Extrusion Process and Extruder Systemmentioning

confidence: 99%

A Review of the Extruder System Design for Large-Scale Extrusion-Based 3D Concrete Printing

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Extrusion forces the molten plastic and magnetic powder mixture through an orifice or die and the magnets it produces have a fixed cross-sectional area. 20 For calendaring, the premixed granulated compound is fed into the rolls to produce continuous magnet sheets. The products of calendaring processes are flexible magnets that often use ferrite powders.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The extrusion and calendaring processes both use similar raw materials (magnetic powder and plastic binder mixture). Extrusion forces the molten plastic and magnetic powder mixture through an orifice or die and the magnets it produces have a fixed cross-sectional area . For calendaring, the premixed granulated compound is fed into the rolls to produce continuous magnet sheets.…”

Section: Introductionmentioning

confidence: 99%

Comparative Techno-economic Assessment of NdFeB Bonded Magnet Production: Injection Molding versus Big-Area Additive Manufacturing

Zhou,

Paranthaman,

Sutherland

2023

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

There is an increasing demand for clean energy technologies such as wind turbines and electric vehicles, which generally require the use of high-performance critical rare earth permanent magnets (REPMs), e.g., neodymium−iron−boron (NdFeB) magnets. However, the growing demand for REPMs is subject to substantial supply risk owing to the near monopolization of the rare earth element supply and processing by China. One approach to lessen this risk is to recover magnet waste from processing and used magnets from end-of-life products. These recovered magnet materials may be used to produce bonded magnets via injection molding (IM). Another processing alternative that has recently been developed is big-area additive manufacturing (BAAM), a fused deposition modeling that produces magnets with comparable or even better performance than IM. Owing to the nascency of BAAM, the economic feasibility of this method at an industrial scale is still unknown. This paper provides a techno-economic assessment of BAAM relative to IM. The results reveal that BAAM is profitable and has a better economic performance than that of IM.

show abstract

“…La extrusión es un proceso en el que un material se hace pasar a través de un orificio para producir una forma deseada por la aplicación de una fuerza, generada por un pistón o un tornillo giratorio (Blackburn & Szymiczek, 2021). En los termoplásticos se usa material en forma de polvos, gránulos, escamas o combinaciones de estas formas, y el proceso se realiza con un plastificador (tornillo en espiral que gira dentro de un barril calentado) ya que para que el polímero fluya es necesario que el proceso se lleve a cabo en estado fundido (Ebnesajjad, 2003;Rosato et al, 2004).…”

Section: Extrusiónunclassified

Aditivación de materiales biodegradables mediante el uso de derivados de colofonia

Vargas¹

View full text Add to dashboard Cite

The general objective of this doctoral thesis was to add biodegradable polymers with gum rosin and its derivatives, using conventional and unconventional processing techniques. This thesis presents eight works within four study blocks that constitute the specific objectives of the research.The first study block conducts a comparative characterization of five gum rosins from different sources to determine their properties and establish the differences between each rosin for their subsequent use and application as sustainable additives for biodegradable polymers. The results showed that the five analyzed gum rosins had a content greater than 80% of abietic acid or its structural isomers and differed in their propensity to absorb environmental moisture and coloration. In addition, all the gum rosins showed thermal stability up to 200 ºC, establishing that these natural materials can be used as additives in thermoplastic polymers without degrading during processing.The second study block examines the compounding of biodegradable polymer matrices with gum rosin, for which two works were developed. The first work uses poly (butylene adipate-co-terephthalate) (PBAT) as the polymeric matrix and rosin (GR) and a rosin pentaerythritol ester (UT) as additives. PBAT was mixed with the resins in various contents, and the formulations were processed by extrusion and subsequent injection molding. The results showed that GR and UT improved the processability of PBAT by reducing its enthalpy of fusion and increasing its thermal stability. The results showed that GR and UT improved the processability of PBAT by reducing its enthalpy of fusion and increasing its thermal stability. Furthermore, the additives increased or maintained the mechanical properties of the PBAT while increasing its hydrophobicity. Therefore, GR and UT proved to be advantageous additives to PBAT for cost reduction in processing and for applications that require high hydrophobicity, such as in rigid food packaging that is easy to process and suitable for industrial scalability. The second work uses poly(ε-caprolactone) (PCL) as a polymeric matrix and GR and beeswax (BW) as additives. The three materials mentioned are biocompatible and biodegradable. The formulations were mixed by extrusion, and the material was processed by an unconventional technique: additive manufacturing or 3D printing. The results showed that mixing the two additives with PCL produced a synergistic effect. This formulation was the most suitable for 3D printing since it behaved better in the printer's traction mechanism. In addition, the formulation presented thermal and xxxiii ABREVIATURAS Y NOMENCLATURA ε (t) : deformación sinusoidal σ (t) : esfuerzo sinusoidal ∆H m 0 : entalpía de fusión teórica para una estructura de polímero 100 % cristalina ∆E: diferencia total de color 2θ: ángulo de dispersión a*: saturación ADN: ácido desoxirribonucleico AgNPs: nanopartículas de plata ARN: ácido ribonucleico b*: ángulo de tono BHA: 3-t-butil-4hidroxianisol BHT: butilhidroxitolueno bio-PA: bio-polia...

show abstract

Extrusion

Cited by 5 publications

References 75 publications

A Review of the Extruder System Design for Large-Scale Extrusion-Based 3D Concrete Printing

A Review of the Extruder System Design for Large-Scale Extrusion-Based 3D Concrete Printing

Comparative Techno-economic Assessment of NdFeB Bonded Magnet Production: Injection Molding versus Big-Area Additive Manufacturing

Aditivación de materiales biodegradables mediante el uso de derivados de colofonia

Contact Info

Product

Resources

About