• 펄프종이기술
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• 제39권4호
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• pp.45-52
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• 2007

Whole, bast and core fibers of kenaf cultivar Tainung-2 were pulped under different pulping methods, thermomechanical and kraft pulping methods. The physical and optical properties of kenaf TMP(thermomechanical pulp) and KP(kraft pulp) handsheets were investigated and the results from the study are summarized as follows: Yields of TMP and KP were $77{\sim}87%\;and\;43{\sim}52%$, respectively. There was no significant change in apparent density between kenaf KP and USKP(unbleached softwood kraft pulp) but TMP showed a little lower apparent density. Bast pulp had the lowest apparent density regardless of pulping methods. Tensile strength of kenaf KP was higher than that of TMP but similar to that of USKP. Both TMP and KP handsheets of bast fraction showed the highest tear strengths among whole, bast, and core fractions. Core fraction showed the lowest tear strengths under different pulping methods. In general burst strength of kenaf pulp under different pulping methods was lower than that of USKP, and kenaf pulp had better stiffness than USKP. Brightness of kenaf KP and TMP was higher than that of USKP. There was no significant variation in opacity between kenaf pulp and USKP even though kenaf pulp showed a little lower opacity. The main difference in paper quality between the core fiber and bast fiber is derived from the fact that bast fiber is long and thin, whereas core fiber is short and thick.

• 한국축산식품학회지
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• 제38권1호
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• pp.1-13
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• 2018

The objective of this study was to investigate quality attributes of beef patties formulated with dried pumpkin pulp and seed mixture (PM). Four different meatball formulations were prepared where lean was replaced with PM as C (0% PM), P2 (2% PM), P3 (3% PM) and P5 (5% PM). Utilization of PM decreased moisture and increased ash content of the patties. Incorporation of 5% PM (P5) increased the pH value of both uncooked and cooked patties compared to C group. Increasing levels of PM increased water-holding capacity. No significant differences were found in cooking yield and diameter change with the addition of PM. Incorporation of PM increased fat and decreased moisture retention of the samples. $a^*$ values were decreased with PM addition, where $L^*$ values did not differ among treatments and $b^*$ values were similar in C, P3 and P5 samples. Textural properties were mostly equivalent to control samples with the incorporation of PM even at higher concentrations. The addition of PM did not significantly affect any of the sensory scores tested. These results indicated that utilization of PM presents the opportunity to decrease the amount of meat besides to improve healthier profile without causing negative changes in physical, chemical and technological quality of beef patties.

• 펄프종이기술
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• 제34권1호
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• pp.7-11
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• 2002

The print quality of a ink jet printer is generally affected by three major components of the printing process: printer, ink formulation, and paper. The result of this study indicated that the surface sized paper with oxidized starch and cationic starch differed ink jet print quality in terms of ink spread and black optical density of the print image. Paper properties, like air permeability and siting degree, which may influence the ink jet printing were also measured. It was found that black print quality was controlled by starch level and ionic charge on the paper surface. Cationic surface sizing starch improved black ink jet print quality.

• 펄프종이기술
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• 제33권1호
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• pp.24-29
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• 2001

The base paper of corrugated board is mainly produced from Korean old corrugated container (KOCC), and thus the recycling rate of KOCC is very high. However, there is a problem that the pulp quality is very low while the recycling rate of OCC is high. The fines content in KOCC, the main source of the corrugated board, amounts to nearly the half of the total stock, and its formation increases as recycling process repeats due to the hornification of fiber. There have been attempts to improve the drainage property of OCC by increasing the headbox concentration of the paper machine or by applying drainage-promoting polymer additives. However, these conventional methods have problems of weakened paper strength and lowered converting fitness caused by paper formation hindrance. The strength of linerboard could not be increased in case KOCC is used, because hornified OCC pulp can-not be sufficiently refined due to the lowered drainage property caused by fines formation. We studied about a new technique consisting of froth-flotation for fractionating pulp stock into a long fiber portion and fines fraction. This study will be developed in order to enhance the drainage and strength properties of a recycled OCC pulp by selective treatment of flocculant on fractionated OCC Fines.

• 펄프종이기술
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• 제33권4호
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• pp.42-48
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• 2001

The spent liquor (BSL) obtained from alkaline sulfite-anthraquinone (AS-AQ) cooking of pine bark was applied as a deinking agent. In the ONP deinking system, although BSL removed the small size of ink particles (${\geq}$$12.5{\mu}m$), it did not improve the brightness of pulp. The brightness of pulp slightly improved when treated with BSL at 150~$180^{\circ}C$. However, the brightness of the pulp was lower than that of a commercial deinking agent (oleic acid). It seems that BSL treated with a high temperature still had a high dispersing ability on the ink particles. Intensive oxidations were introduced, and remarkable deinking effects were observed at 13kgf/$cm^2$ oxygen pressure, $160^{\circ}C$ and 2h. When BSL treated at 13kgf/$cm^2$ oxygen pressure, $170^{\circ}C$ and a time period of 30~90 min is added to the pulp, at 0.1% or lower, the deinking effect became higher than that of oleic acid. On the other hand, additional alkali treatments during the oxidation possibility as a deinking agent when oxidized. However, since the oxidized BSL still has a high dispersing ability and lower molecular weight, several modifications need to be done in the near future in order to be applied as a high quality deinking agent.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.325-329
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• 2006

Nippon Paper Industries, Co., Ltd. declared conversion of all the bleaching process to ECF, and most of the production had converted by now. To reduce ECF bleaching cost, we found that depending on electricity supply condition of the mill, utilization of ozone bleaching could be very effective. In addition, hot acid treatment of unbleached pulp also seemed to be effective for hardwood. In this study, several conditions for each technology were examined with the pulps from our own mills to reduce bleaching cost and to keep fiber quality acceptable level. In hot acid treatment study, with mild conditions (temperature lower than $90^{\circ}C$), sufficient reduction in Kappa number and hexenuronic acids content of the pulp were observed, while pulp viscosity was maintained. Moreover, to maintain strength of bleached pulp that subjected both to ozone bleaching and hot acid treatment, recommended Kappa number after ozone bleaching was more than 3. Based on these findings, two of our mills had installed medium-consistency ozone bleaching facilities and three mills installed hot acid treatment. Especially in Yatsushiro mill, both were installed in one bleaching line (A-ZD-E/P-D sequence), and running successfully.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2007년도 추계학술발표논문집
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• pp.21-33
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• 2007

CPAM has been applied to the paper industry for the purpose of wet-end improvement for a long time. And molecular weight and charge density have been managed most important quality factors to make CPAM for this application. Recently branched CPAM was developed to improve retention and drainage characteristics and we considered branch degree of CPAM as important factor as molecular weight and charge density. In this experiment, we tried to investigate physical and chemical properties to determine branch degree and flocculation efficiency using Arbocell pulp which was recently developed micro size pulp and finally we applied retention and drainage test under the ONP stock condition.

• Journal of Microbiology and Biotechnology
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• 제33권4호
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• pp.533-542
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• 2023

Exo-polygalacturonase (exo-PG) hydrolyzes pectin acids and liberates mono-galacturonate, which plays an important role in juice extraction, and has rarely been reported. Exo-PG (AfumExoPG28A) from Aspergillus fumigatus belongs to the glycoside hydrolase 28 family. In this study, its gene was cloned and the protein was expressed and secreted in Pichia pastoris with a maximal activity of 4.44 U/ml. The optimal temperature and pH of AfumExoPG28A were 55℃ and 4.0, respectively. The enzyme exhibited activity over almost the entire acidic pH range (>20.0% activity at pH 2.5-6.5) and remained stable at pH 2.5-10.0 for 24 h. The K_m and V_max values of AfumExoPG28A were calculated by the substrate of polygalacturonic acid as 25.4 mg/ml and 23.6 U/mg, respectively. Addition of AfumExoPG28A (0.8 U/mg) increased the light transmittance and juice yield of plantain pulp by 11.7% and 9%, respectively. Combining AfumExoPG28A (0.8 U/mg) with an endo-PG (0.8 U/mg) from our laboratory, the enzymes increased the light transmittance and juice yield of plantain pulp by 45.7% and 10%, respectively. Thus, the enzyme's potential value in juice production was revealed by the remarkable acidic properties and catalytic activity in fruit pulp.

• 자원리싸이클링
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• 제24권5호
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• pp.22-32
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• 2015

본 연구는 폐기저귀 재활용 공정 이후 회수되는 재생 자원의 가치를 높여 경제성을 확보하기 위한 관점에서 업사이클링 개념을 논의하고, 벤치마킹을 통해 펄프와 혼합 플라스틱의 업사이클링 방안을 수립하고자 하였다. 업사이클링은 원래의 물질이 다시 사용될 때 품질이 향상되고 폐기물을 질적 환경적으로 더 높은 가치를 가진 새로운 물질이나 제품으로 전환하는 과정으로 요약되며, 다양한 사례를 통해 용도를 다 한 제품이더라도 새로운 가치를 갖게 된다는 것을 알게 되었다. 그러나 기존의 업사이클링 사례들은 정성적인 디자인 요소를 통한 가치 창출이므로 정량적인 전략의 도출이 어렵고 업사이클링 완제품 시장 경쟁력에 대한 판단이 불확실하다. 따라서 본 연구에서는 활용성 차원에서 B2B 제품까지 범위를 확장하고, 재생펄프와 혼합 플라스틱 두 소재를 같이 활용할 수 있도록 업사이클링 방향성을 설정하여 이를 만족할 수 있는 제품군에 대해 분석하였다. 그 결과, 셀룰로오스 단열재로의 적용을 제안하며, 향후 국내/외 단열재 시장에서 고성능 셀룰로오스 비중이 약 3배 이상 급성장 할 것으로 예측되기 때문에 본 시장을 목표로 업사이클링 전략을 세워야 할 것으로 보인다.

• 한국식품과학회지
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• 제27권6호
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• pp.921-927
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• 1995

복숭아 펄프를 11,000 rpm에서 10분간 원심분리하여 serum과 불용성 펄프를 분리하였고, serum을 $50{\sim}55^{\circ}C$, $30{\sim}50\;mmHg$에서 농축하면서 초기에 발생하는 증기를 회수하여 방향성분 획분으로 하였다. 방향성분 획분은 serum의 양에 대하여 $0{\sim}5%$(AR-1), $5{\sim}10%$(AR-2), $10{\sim}15%$(AR-3), $15{\sim}20%$(AR-4)로 하였다. 방향성분 획분의 휘발성 향기성분은 DHC법에 의하여 포집하였고, 포집한 향기성분을 동정하기 위하여 GC/MS를 사용하여 분석하였다. 복숭아 펄프의 serum 분리율은 70.5%였으며, 대부분의 향기성분들은 serum에서 더 높게 나타났다. Ethylene, benzaldehyde, l-limonene, ${\gamma}-dodecalactone$ 등의 31종의 향기성분이 확인되었으며, 향기성분의 상대적인 총량은 AR-1에서 AR-4로 갈수록 감소하였으며 피크의 면적 및 갯수도 점차적으로 줄어들었다.