• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.14 no.10
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• pp.775-780
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• 2002

An experimental study on the characteristics of several kinds of packing materials was carried out in order to get the optimum design data for the packed-type rectification system of an NH$_3$/$H_2O$ GAX absorption heat pump. Several suitable packing materials were examined and the bulk of steel wire was shown as the most effective packing material in rectifier. The optimum volumetric ratio of packed steel wire in rectifier was obtained as around 36%. The performance results can be adapted in rectifier design of absorption heat pump.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.12
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• pp.477-482
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• 2016

Airtight containers have been widely used in many industries and household. They need a packing for sealing between the inside and outside. Previous packing materials have some drawbacks like stench, stickiness, and difficulty of applying to automated manufacturing systems. So, a new packing material which is harmless and suitable for automation is needed. This study performed a hot plate welding process of thermoplastic elastomer (TPE) as the packing material. The hot plate welding process included a phase change process of solidification and melting. The porosity-enthalpy method was adopted in order to simulate phase change problems. The TPE showed non-Newtonian fluid characteristics during the melting process. Since properties of SEBS are not well-defined, we established TPE properties by observing the melting behavior of TPE. In order to find an optimized condition, a parametric study including packing thickness, shapes, hot plate temperature, and thermal resistance, was conducted.

• Journal of the Semiconductor & Display Technology
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• v.21 no.2
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• pp.51-56
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• 2022

Recently, the demand for semiconductors is expanded to various industries, and the use of high-quality and high-performance chips is increasing. With the trend, the diameter magnification and high integration of the semiconductor wafers are mandatory. As a result, there is a growing demand for the productivity improvement and the surface precision. There have been many studies on the stabilization of the wafer manufacturing processes in order to satisfy those specifications. Many complaints have been appealed by the wafer buyers that there are many unacceptable wafers with surface defects and foreign material adhesion which are caused by the vibrations during transportation. This study intends to derive the material improvement of the packing box of the wafers to suppress the vibrations of the box, and eventually to reduce the surface defects and the foreign material adhesion. The result shows that optimal material can substantially decrease the vibration of the packing box.

• Journal of the Korean Wood Science and Technology
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• v.2 no.3
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• pp.39-41
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• 1974

Bastard indigo, prevailing shrub species planted in erosion control work to constitute vegetation, is proved to be usefull for pulp material other than existing usage of green manure or fuel. Pulp made from bastard indigo is good enough for filler pulp though the quality of it is not remarkably excellent. (1) Sorts of paper possible to make from this pulp. Packing paper of medium grade. (general packing paper except heavy packing) (2) Traits of this pulp as for pulp material (A) It is more preferable than annual plants in these respects, ego collection, transport and storage of pulp material, and yield, freeness and chemical consumption of pulp. (B) Annual probable production of pulp material per ha from this plant is higher than that from long-term tree species or similar to that from fast growing species. (C) Its cultivation on eroded area is welcomed and consecutive annual production of material by copice method is also proved possible.

• Biotechnology and Bioprocess Engineering:BBE
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• v.7 no.5
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• pp.316-322
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• 2002

A newly isolated heterotrophic marine bacterium, Vibrio alginolyticus, was used to remove a high load of ammonia gas under non-sterile condition. The cells were inoculated onto an inorganic packing material in a fixed-bed reactor (biofilter), and a high load of ammonia, in the range of ammonia gas concentration of 170 ppm to 880 ppm, was introduced continuously. Sucrose solution and 3% NaCl was supplied intermittently to supplement the carbon source and water to the biofilter. The average percentage of gas removed exceeded 85% for 107-day operation. The maximum removal capacity and the complete removal capacity were$19\;g-N\;kg^{-1}$ dry packing material $day^{-1}$ and $16\;g-N\;kg^{-1}$ dry packing material $day^{-1}$, respectively, which were about three times greater than those obtained in nitrifying sludge inoculated onto the same packing material. On day 82, the enhanced pressure drop was restored to the normal one by NaOH treatment, and efficient removal characteristics were later observed. During this operation, the non-sterile condition had no significantly adverse effect on the removability of ammonia by V. alginolyticus.

• Microbiology and Biotechnology Letters
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• v.41 no.2
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• pp.215-220
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• 2013

Biofilters for the removal of methane using tobermolite, perlite and polyurethane as packing materials have been undergoing recent development. The effects of these packing materials on methane oxidation activity were evaluated in this study. Mixed methanotrophs (consortia A, B, C and D) from wetland and landfill soils were used as the inoculum sources. The influences of packing materials, consisting of tobermolite, perlite, and polyurethane, on the methane oxidation rate and methanotrophic bio-mass, were estimated. When perlite was added into the methanotrophic cultures, the methane oxidation rate was more than twice that of the control (without packing materials), and the methanotrophic biomass increased more than 10 fold. The ratio of methanotrophic bacteria to total bacteria under with tobermolite packing material was higher than the control and the other packing materials, indicating that tobermolite can serve as a specific packing material where dominance of methanotrophs is desired. Therefore, perlite and tobermolite provide habitats which increase the activity of methanotrophic bacteria, and these packing materials are promising for use in methane oxidation processes.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.9
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• pp.130-137
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• 1996

In the present paper the effect of various process conditions on the final weight of injection molded rectangular plates has been investigated in detail. The main parameters involved in the simulations were melt temperature, mold temperature, injection speed and packing pressure. The dimensions of the plate used were 100mm long, 2mm of width and polystyrene was used as a molding material. The shear viscosity of the polymeric material was treated as a function of shear rate, temperature and pressure through the whole processes including packing and cooling stages. By increasing a packing pressure the final weight of sample increased linearly. Furthermore, as the melt temperature, the mold temperature and the injection speed increased, the final weight of the injection molded plate decreased within the molding window.

• Fashion & Textile Research Journal
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• v.9 no.4
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• pp.445-449
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• 2007

The results of warmth retaining, heat transfer and compressive elastic recovery of the five kinds of bedspread fabrics, which were produced from packing weft of 2700 denier and 3600 denier batt yarn treated with raw material of Polyester $150^D$/48 DTY, are as follows: 1) 3600 denier packing weft showed lover count in compressive elastic recovery than 2700d packing weft, so it took longer time to recover. 2) When packing weft of the same count is used, a sample of packing weft with higher density showed lower recovery. 3) It took 2700d packing weft 30min to get approximately 98% recovery in temperature $30^{\circ}C$. But, 3600d packing weft stayed under 98% recovery in the same temperature. Considering only the result of compressive elastic recovery, we should use 2700d packing weft. 4) The higher the density of packing weft is, the higher warmth retaining becomes. Although sharp increase appeared until 5min, equilibrium was kept without any increase after that time. 5) When 2700d packing weft was used, the maximum warmth retaining was approximately 60% and 64% in the conditions of density 12(thread/in) and 22(thread/in) respectively.

• Journal of environmental and Sanitary engineering
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• v.17 no.4
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• pp.61-67
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• 2002

NIRS(Near infrared spectroscopy) scanning from 1300nm to 2400nm was appl ied for the DEHP(di-(2 ethylhexyl)phthalate) in PVC(polyvinyl chloride_packing material. All samples were devided into calibration group and validation group. As a result of conduction the multiple regression analysis on the correlation between the NIR spectrum data and chemical assay value obtained by the Korea Food Sanitation Act. The validation model for measuring the DEHP content had R of 0.997, SEC of 0.132, SEP of 0.176 by MLR and R of 0.996, SEC of 0.142, SEP of 0.198 by PLS and the detection limit was 0.1%. The obtained results indicate that the NIR procedure can potentially be used as a nondestructive analysis method for the purpose of rapid and simple measurement of DEHP in PVC packing material.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.30 no.12
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• pp.782-787
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• 2017

There is growing interest in power inductors in which metal soft magnetic powder and epoxy resin are combined. In this field, the process technology for increasing the packing density of magnetic particles in an injection molding process is very important. However, little research has been reported in this regard. In order to improve the packing density, we investigated and compared the sedimentation heights of pastes for three types of soft magnetic alloy powders as a function of the mixing ratios and the type of resin used. Experimental results showed that the packing density was the highest (71.74%) when the mixing ratio was 80 : 16 : 4 (Sendust : Fe-S : CIP) according to the particle size using an SE-4125 resin. In addition, the packing density was found to be inversely related to the layer separation distance. As a result, it was confirmed that the dispersion of solid particles in the paste was important for curing; however, the duration of the curing process can greatly affect the packing density of the final composite.