Digital light processing (DLP) is an accurate additive manufacturing (AM) technology suitable for producing micro-parts by photopolymerization. As most AM technologies, anisotropy of parts made DLP a key issue to deal with, taking into account that several operational factors modify this characteristic. Design and photopolymers becomes challenge because the process post-processing strongly influence mechanical properties part. This paper shows experimental work demonstrate particular...

Natural fibers have been used as an alternative to synthetic ones for their greener character; banana the advantage of coming from agricultural residue. Fibers extracted by mechanical means tree pseudostems, a strategy valorize crops residues. To increase properties composite, technical textiles can be reinforcement, instead short fibers. do so, must spun and woven. The aim this paper is show viability using obtain yarn suitable woven, after enzymatic treatment, which more environmentally...

Despite the dramatic change that Tissue Engineering or stem cell therapies have brought to current therapeutic strategies, there is a lack of functionalities in available biomaterials for manufacturing scaffolds treat several highly prevalent osseous diseases (osteochondral defects, osteoporosis, etc.). One promising approach fill this gap involves development innovative piezoelectric improved bone regeneration. Scaffolds with appropriate piezoelectricity can positively influence...

Abstract Purpose The purpose of this paper is to extend existing knowledge 4D printing, in line with Khoo et al. (2015) who defined the production printing using a single material, and multiple materials. It proposed that can be achieved through use functionally graded materials (FGMs) involve gradational mixing are produced an additive manufacturing (AM) technique achieve component. Design/methodology/approach latest state-of-the-art literature was extensively reviewed, covering aspects...

Several natural materials and vegetable waste have relevant mechanical properties, mainly in its fiber format. Particularly, banana (BF) provides a close behavior to the widely spread glass fibers, which places it an advantageous position for use as reinforcing material plastic composites. This work characterizes of acrylonitrile butadiene styrene (ABS), high impact polystyrene (HIPS), density polyethylene (HDPE) reinforced with short fibers bananas from Canary Islands application molding...

INTRODUCTION: Cranioplasty (CP) is crucial after decompressive craniectomy to restore cranial integrity in various intracranial pathologies. However, the optimal timing for CP remains a debate. Existing literature presents spectrum of studies with varied timings and outcomes, yielding conflicting insights. METHODS: A database search was conducted until April 8th, 2024, identify reporting outcomes patients that underwent early late CP, establishing 90-day cutoff. Primary were hydrocephalus,...

The influence of manufacturing parameters filament extrusion and extrusion-based Additive Manufacturing (AM), as well different post processing techniques, on the electrical conductivity 3D printed parts graphene nanoplatelets (GNP)-reinforced acrylonitrile butadiene styrene (ABS) has been analyzed. key role to obtain electrically conductive filaments demonstrated. Results have shown that an increase in speed, lower land lengths, induces higher extrudate swelling, with consequent reduction...

This paper compares the mechanical properties of different natural fiber composites produced by rotational molding as a way waste valorization from campaigns to control invasive plant species in Macaronesia. Rotomolded parts with polymeric matrices (polyethylene) and filled up 20% weight cellulosic fibers obtained Arundo donax L., Pennisetum setaceum, Ricinus communis plants were characterized terms tensile, flexural, impact strength. It was found that sieving allowed for their introduction...

Abstract This paper assesses the modifications in properties of rotomolded polyethylene (PE) and polylactic acid (PLA) composites obtained with 5 10% giant reed fibers, mainly focusing on alterations due to a bio-disintegration process. Thermal (melting temperature crystallinity degree), morphology (via optical scanning electron microscopy), chemical changes (by Fourier Transformed Infrared spectroscopy) were studied. Composites untreated NaOH-treated fibers obtained, finding that this...

The incorporation of ceramic additives is the most commonly used strategy to improve biofunctionality polymer-based scaffolds intended for bone regeneration. By embedding particles as a coating, functionality improvement in polymeric can be concentrated on cell-surface interface, thus creating more favourable environment adhesion and proliferation osteoblastic cells. In this work, pressure-assisted heat-induced method coat polylactic acid (PLA) with calcium carbonate (CaCO3) presented first...

The use of natural fibres allows reducing environmental impact, due to their renewable origin and the lower energy needed for production processing. This work presents mechanical characterization a newly developed technical textile, with banana fibre treated by enzymes, comparing experimental results numerical simulation based on definition unit cell at micromechanical level. test shows that composite fabric worse behaviour than one commercial flax fibre. presence wool, necessary producing...

4D printing is a technology that combines the capabilities of 3D with materials can transform its geometry after being produced (e.g. Shape Memory Polymers). These advanced allow shape change by applying different stimulus such as heating. A printed part will usually have 2 shapes: programmed (before applied), and original (which recovered once has been applied). Lightweight parametric optimization techniques are used to find best combination design variables reduce weight lower...

Bags used to protect and accelerate the ripening of bananas are a clear example environmental problem packaging waste. Small pieces these non-biodegradable bags frequently disposed on soil by accident (environmental conditions poor handling during harvest) remain there for years. This work focuses development protective biodegradable reinforced with banana fiber, obtained from waste plants, thus promoting circular economy more environmentally friendly process. To achieve this, different...

The combination of Atomic Diffusion Additive Manufacturing (ADAM) and traditional CNC machining allows manufacturers to leverage the advantages both technologies in production functional metal parts. This study presents methodological development hybrid manufacturing for solid copper parts, initially produced using ADAM technology subsequently machined a 5-axis system. was dimensionally characterized by adapting seven types test artifacts standardized ISO/ASTM 52902:2019. results showed that...

The degradation rate of polycaprolactone (PCL) is a key issue when using this material in Tissue Engineering or eco-friendly packaging sectors. Although different PCL-based composite materials have been suggested the literature and extensively tested terms processability by extrusion additive manufacturing, little attention has paid to influence fillers on mechanical properties during degradation. This work analyses possibility tuning filaments introduction microcrystalline cellulose into...

The trauma of central nervous system (CNS) can lead to glial scar, and it limit the regeneration neurons at injured area, which is considered be a major factor affecting functional recovery patients with CNS injury. At present, study scar model in vitro still limited two-dimensional culture, state vivo cannot well mimicked. Therefore, we use collagen gel astrocytes construct three-dimensional (3D) mimic natural tissue. effects concentration changes on cell morphology, proliferation, tissue...

Purpose – The purpose of this paper is to report on the use a combination selective laser sintering (SLS) and vacuum casting create plastic composites made by additive manufacturing. Design/methodology/approach research has been carried out approaching new concept final part consistent in component, where main body SLS internal long fibres for reinforcing are high-resistance epoxy resin. designed optimal number distribution taking into account target relative stiffness (N/mm*kg). methodology...