Bubble development in a polymeric resin under vacuum

Sul, In Hwan; Youn, Jae Ryoun; Song, Young Seok

doi:10.1002/pen.23112

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…Extensive research has been carried out in this stage, especially in terms of collection and sorting techniques, such as flotation , optical sorting, density separation , electrical separation , etc. In the second stage, the recycled plastic pellets, powder or flakes are molten and reprocessed into final products by resin molding techniques , including extrusion molding , injection molding , blow molding , vacuum molding , inflation molding , melt spinning , etc.…”

Section: Introductionmentioning

confidence: 99%

Mechanical reprocessing of polyolefin waste: A review

Yin

Tuladhar

Shi

et al. 2015

Polymer Engineering & Sci

173

112

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Efficient technology and applications for recycled polymer waste has become increasingly important to decrease environmental contamination and to conserve nonrenewable fossil fuels. Mechanical recycling is the most widely practiced in Australia, since it is relatively easy and economic; and moreover, infrastructure for collection and reprocessing has been well established. In order to improve quality of end products of recycled plastics, various workable reprocessing techniques in the second stage of mechanical recycling have been developed and widely applied in the recycling industry. This article critically reviews the current reprocessing techniques of recycled polyolefins. Reprocessing recycled polyolefins is always accompanied with degradation, crystallization, and consequent processability problems, which result from molecular chain scission, branching, and crosslinking. The present state of knowledge and technology of various reprocessing techniques, including melt blending, filler reinforcement and mechanochemistry, is then described and evaluated systematically. Each reprocessing technique presents its own individual advantages and special applications. POLYM. ENG. SCI., 55:2899-2909, 2015

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Section: Introductionmentioning

confidence: 99%

Mechanical reprocessing of polyolefin waste: A review

Yin

Tuladhar

Shi

et al. 2015

Polymer Engineering & Sci

173

112

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“…The liquid was loaded into the lumens in view of the capillary in the nonvacuum situation and pressure balance in the vacuum case. [27][28][29][30] In the atmospheric environment, the cohesive force in the liquid causes surface tension and interacts with the adhesion force between the liquid and the fiber wall, thus playing the role of pushing the liquid. 31 In the case of negative pressure, the pressure changes, causing the air in the liquid to expand, thereby guiding the liquid upward to form a segmented liquid status (Figure 4).…”

Section: Loading Capacitymentioning

confidence: 99%

An analytical approach to study the loading behavior of hollow fibers under negative pressure and atmospheric pressure

Tang

Cheung

Zhao

et al. 2022

Textile Research Journal

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Hollow fibers have been widely used as important components of membranes for drug delivery in the medical field. However, their usages in environmental and agricultural aspects have not been commonly unearthed. In our previous research, a new drug delivery system was established by utilizing hollow fiber as a carrier to convey medical substances in different phases, respectively. Our current research aims to expand the application of hollow fibers apart from medicine. In this study, the loading efficiency of the liquid under standard atmospheric pressure (nonvacuum) and negative pressure (vacuum) were further examined to achieve a higher loading system. The physical properties and the loading abilities of the three types of hollow fibers including original short crimped fibers, fibers from roving yarns, and fibers from spun yarns were studied and discussed. In-depth investigations of loading efficiency, wicking performance, water absorption, and thermal conductivity were conducted. Higher loading efficiency was observed by adopting the method of vacuum under negative pressure resulting from all experiments of which the result was at least 15 times higher than the nonvacuum-loaded methods. It was also at least 0.25% greater in moisture content, almost two times larger in the water absorption rate for yarn samples, and 35% higher for fabric samples. The differences in thermal conductivity within the two conditions were 0.00016 W/cm°C. Using the vacuum approach can improve the overall performance of precise liquid loading, increasing the efficiency and thereby reduce the production costs. It is believed to bring high-value advantages in agricultural aspects such as for sustainable pest control and crop growth.

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“…However, casting technology in the manufacturing process has a high quality problem that air bubbles are generated by the resin. Air bubbles affect the mechanical properties of the capsule [15][16][17][18]. The resin was heated to lower its viscosity and suppress the generation of air bubbles.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Fracture Location of Capsules Using the Bonding Surface Characteristics of Photocurable Resin

Hu,

Lim,

Cheng

et al. 2023

MSF

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In recent years, self-healing research has been actively carried out to increase the life and stability of concrete structures. A representative method of concrete self-healing is a method using a bacterial substrate and a capsule. Bacteria-based self-healing is greatly influenced by the external environment, and sleeping structures are more suitable for capsule-based methods. In this study, the mechanical properties of the bonding surface of the photocurable resin are used to grow cracks in the capsule so that the self-healing capsule pops out and the healing liquid inside the capsule can be diffused efficiently. We proceeded with research to form pathways. The study analyzed the concordance rate of the bonding surface of the capsule and the judging position, and analyzed the factors affecting the concordance rate. As a result, by adjusting the number of bonding surfaces and the degree of air bubble removal, the rate of coincidence between the bonding surfaces and the fracture position was increased from 15.48% to 63.18% by a factor of 4.08.

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Bubble development in a polymeric resin under vacuum

Cited by 10 publications

References 37 publications

Mechanical reprocessing of polyolefin waste: A review

Mechanical reprocessing of polyolefin waste: A review

An analytical approach to study the loading behavior of hollow fibers under negative pressure and atmospheric pressure

Controlling the Fracture Location of Capsules Using the Bonding Surface Characteristics of Photocurable Resin

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