• 콘크리트학회논문집
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• 제13권4호
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• pp.346-353
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• 2001

본 연구는 얇은 시멘트판 제품의 보강재로써 건조공정에 의해 생산된 폐지섬유의 최적 배합비를 도출하기 위하여 수행되었다. 이를 위해 순수 목질섬유 대비 폐지섬유의 대체수준을 세분화하여 실험을 실시하였으며, 슬러리-탈수 공법을 사용하여 폐지섬유보강 시멘트 복합체를 제조하였다. 본 연구는 실험적 연구와 반응표면 분석법을 활용한 통계적 분석을 통해 공정인자(가압, 비가압)과 섬유보강재 조건(섬유혼입율, 순수섬유 대체수준)을 최적화하였다. 최적화된 재생 폐지섬유 시멘트 복합체를 기술적으로 분석하였으며, 그 결과, 폐지섬유보강 시멘트 복합체의 성능과 경제적 측면에서 폐지섬유의 재활용이 가능하리라 판단된다.

• 한국언론정보학보
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• 제77권
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• pp.200-254
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• 2016

본고는 광복 이후 한국 신문용지 시장의 역사적 변화를 살펴보는 데 그 목적이 있다. 보다 구체적으로는 신문용지 수급 상황에 대한 경제사적 관점과 함께 신문용지의 시장 상황에서 벌어지는 시장행위자들(국가, 제지업계, 신문업계)의 시장행동에 대한 사회사적인 관점을 통해서, 한국 신문용지 시장의 일반적인 역학(dynamics)을 규명하는 데 있다. 한국 신문용지 시장의 일반적인 역학과 상호작용은 우선 부존자원 부족이라는 자연적 제약 탓에 외부 시장의 요인에 의해 지속적으로 영향 받았던 것으로 해석할 수 있다. 광복 이후 신문용지의 자유무역화가 이뤄졌던 1967년 이전 시기까지, 국가는 관세를 통한 가격 통제와 수입 허가 통제를 통해 외부 시장의 힘을 조절하고자 하였고, 이 과정에서 제지업계에 대한 외자(外資) 지원 정책을 통해 (수입 대체 효과와 자급 체계 구축을 실현시킴과 동시에) 제지업계에 대한 통제와 언론계에 대한 통제를 동시에 수행할 수 있었다. 그러나 1967년 이뤄진 신문용지 수입 개방은 신문용지 시장의 일반적인 역학이 '외부 시장의 통제되지 않는 효과'에 노출되는 계기였다. 이에 따라 신문용지 자급 체제가 이뤄진 이후에도 오일쇼크 등에 민감하게 반응하여 신문용지 가격이 출렁거리는 경우가 빈번하였다. 또 정부의 정책은 제지업계와 신문업계 사이에서 갈팡질팡하였고, 민주화 국면에서 발생했던 신문업계 내의 경쟁 심화라는 상황 속에서 제지업계는 수입 신문용지와 경쟁하기 위해 과잉 시설투자를 하였다.

• 공업화학
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• 제10권2호
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• pp.299-303
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• 1999

경제적, 환경적인 이유로 신문용지를 생산하는데 신문고지가 상당량 재이용되고 있다. 본 연구에서는 국내 외 신문고지의 열화기간에 따른 제반 성질의 변화를 조사하기 위하여 시도하였다. 시료의 백색도, 수율 및 펄프 강도를 고려하면 열화기간이 증가할수록 탈묵성이 호주산 신문고지에서 가장 우수하고, 국내 신문원지를 사용한 신문고지와 일본 신문고지는 비슷하며, 카나다산 신문원지를 사용한 신문고지에서 가장 낮았다. 국내 신문원지를 사용한 신문고지의 경우, 열화기간 90일까지는 약 83%의 수율과 백색도 50% 이상을 나타내지만 그 이후에는 급격히 감소하였다. 또한 국내 신문용지의 경우 수입된 신문용지보다 섬유의 길이는 짧지만 제반 강도적성질은 높았다. 국내 신문용지와 수입 신문용지는 전반적으로 열화기간에 따라 인장강도와 파열강도는 증가하다가 감소하였으며, 인열강도는 점차 증가하였다.

• 펄프종이기술
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• 제35권1호
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• pp.41-47
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• 2003

Recently, interest in utilization plan of recycling paper have been enhanced. Therefore, this research aimed to develop the manufacture process of cellulose acetate using old newsprint by acetosolv pulping process. And the manufactured cellulose acetate was also analyzed, especially based on chemical properties. The summarized results in this research were as follows; Reaction time, kind and amount of catalyst, and ratio of liquor to material were varied during acetosolv pulping process of old newsprint. Ratio of liquor to material did not give the significant difference in reaction product. Delignification rate was increased with increasing reaction time during acetosolv pulping, but yield and degree of substitution decreased with increasing reaction time. Sulfuric acid are better catalyst than hydrochloric acid in acetosolv pulping process for old newsprint, and optimal addition amount of catalyst was 1% based on reaction material. Delignification, yield, and degree of substitution were influenced by the catalyst and reaction time. Under pulping condition of $120^{\circ}C$ in 1/12 liquor to material ratio and 60min, degree of substitution was about 0.7. The acetylation reaction was not completely caused by these reaction condition. The examination of the FT-IR spectra revealed that absorption band(1200$\textrm{cm}^{-2}$, 1,750$\textrm{cm}^{-1}$) caused by carbonyl group were confirmed.

• 펄프종이기술
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• 제31권5호
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• pp.12-17
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• 1999

This study was to evaluate applications of the alkalophilic enzymes from Coprinus cinereus 2249 with old newsprint(ONP). A enzymatic deinking process based on alkalopholic enzymes was investigated . It was found that alkalophilic enzymes could effectively deink old newsprint. When applied on deinking of the old newsprint, it increases the freeness and brightness due to effect of hydrolysis at 0.1% enzyme concentration . Also, the physical properties of deinked pulp were improved.

• 펄프종이기술
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• 제34권1호
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• pp.12-21
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• 2002

The effect of soft nip calendering variables including pressure, temperature, nip residence time and moisture on newsprint properties was investigated. The change of bulk, opacity, smoothness, and gloss were determined. It was found that the influence of calendering pressure and temperature are more significant compare the Influence of sheet moisture content and nip residence time on newsprint properties. Calendering conditions of 16$0^{\circ}C$ of temperature, 78kg$_{f}$/cm of line load and 4ms of nip residence time were considered to be optimum conditions to obtain reasonable gloss and smoothness while minimizing the loss of bulk and opacity for newsprint.

• 한국인쇄학회지
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• 제27권1호
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• pp.59-71
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• 2009

Measuring ink penetration is one of the best ways to know paper printability. Ink penetration was effected by physical properties of newsprint paper. This study was carried out for the purpose of improvement printability with ink penetration of domestic newsprint paper. The samples were prepared by means of 20 newsprint paper manufacture company in Korea, and were tested by IGT printability tester. The results of this experiments showed that the depth of ink penetration according to the printing pressure. The maximum points in ink transfer curve and the coefficients of oil absorption of the papers also depend mainly upon the situation of anchor points.

• Journal of the Korean Wood Science and Technology
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• 제24권2호
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• pp.42-45
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• 1996

A residue from the newsprint waste was investigated as a filler in adhesive for bonding southern pine plywood. The residue was prepared by drying the wet residue to 8% moisture content and grinding the dry material using a laboratory Wiley mitt with a 75-${\mu}m$(200-mesh) screen. The residue was compared to a commercial filler commonly used in structural plywood adhesives. A total of 48 three-ply panels. 12.7mm nominal thickness and 0.3 by 0.3 m in size, were fabricated at two press times(4 and 5 min) and three assembly times(20, 40 and 60 min). Evaluations of the residue were carried out by performance tension shear tests after two 4-hour boil accelerated aging tests on plywood. The test results included tension shear strength and estimated wood failure values. All plywood made with the residue filler were comparable to the control-bonded plywood. These results indicate that residue from the newsprint waste streams would be suitable as filler for plywood adhesives.

• 펄프종이기술
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• 제35권4호
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• pp.23-33
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• 2003

The possibility of real time analysis about hot melt resins and pressure sensitive adhesives in newsprint stock was investigated by performing comparative tests using conventional image analysis method and real time contaminants analyzer. Based on the test results, the performance of real time contaminants analyzer in terms of detecting primary stickies in newsprint stock could be verified. Real time stickies analysis showed good precision and over-estimation of hot melt resins and under-estimation of pressure sensitive adhesives could be corrected by adapting new method. Real time analysis of primary stickies in the actual newsprint stock also showed good correlation with conventional image analysis and the performance of real time contaminants analyzer could be verified again. Adjustment of the contrast sensitivity of real time contaminants analyzer was enough to set the proper monitoring conditions for primary stickies in newsprint stock.

• 펄프종이기술
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• 제31권1호
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• pp.1-9
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• 1999

This study was performed to investigate the deinkability of Korean old newspaper(KONP) and the properties of newsprint made from deinked pulp with some addition of virgin pulp. When the samples of composed of 50% Australian old magazine(AuOMG) and 50% KONP were compared with the samples 50% AuOMG and 50% AuONP, the yield, opacity, strength properties of the former were high, but its brightness was low. When the mixing ratio of AuOMG : AuONP : KONP was 30:20:50, the brightness and strength properties were obtained the similar or better than those obtained samples having other mixing ratio. The brightness and opacity of samples made from deinked pulp with the some addition of TMP and BKP can meet the minium qualifications of brightness and opacity specified by Japanese Industrial Standard. The samples, which DIP, TMP, and KP were mixed with the ratio of the 85:10:5 and 90:5:5, maintained higher brightness and strength comparing to the samples containing higher amount of virgin pulp. Since the newsprint samples made from KONP was not inferior to those from imported old newspaper, the more use of KONP in producing newsprint is recommended.