• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.31 no.1
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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.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.34 no.3
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• pp.46-52
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• 2002

To produce the raw material used for printing and writing paper or high quality tissue, MOWs that were consisted of white ledger, colored ledger and old newspaper were bleached with EoP and EoPY(FAS) method, the EoP bleaching process gave the improvement in brightness and a high color removal efficiency. Especially, MOW B(initial brightness: 59.1％ ISO) that contained much old newspaper showed the higher bleaching efficiency than those of MOW A(initial brightness: 68.3%). After EoPY(FAS) bleaching, MOW's brightness was increased from 68.3% ISO to 84.3∼84.0% ISO, and from 59.1% ISO to 78.7∼79.2% ISO, respectively. Also the tensile and burst index of bleached pulps decreased by 10∼30%. The tear index slightly decreased or halted at the same range as unbleached pulps.

• Korean journal of communication and information
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• v.35
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• pp.211-249
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• 2006

This study investigated how many and which articles readers read in daily newspapers. Distinguished from previous research that measured readers' perception of their reading habits, this study picked up readers who read the newspaper in the morning, showed them every article in the newspaper, and asked them whether they read each article. This method enhanced the accuracy of measuring subjects‘ reading behavior. According to the results, 6.2% of the readers read at least half of the articles of the general section in the newspaper. Fewer readers went over the economic section of the newspaper. It was 4.1% of the readers. There were only 1.1% of readers who did not read any article of the general section, but the rate soared to 26.5% for the economic section. Many newspaper readers did not skip the first five pages of the newspaper, however the highest readership pages were found in the national coverage located in the middle of the general section. On the other hand, few readers read the articles on pages covering culture, international issues, and people. Readership of the top stories showed some unexpected results. The top stories of national coverage located in the middle of the general section were read by more readers than the top stories of the front pages. This study also investigated the difference between young and old readers. The readers of twenties and thirties did not read as many top stories on major pages and editorials as the readers of forties and older.

• Applied Chemistry for Engineering
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• v.7 no.4
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• pp.787-793
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• 1996

In this paper, to investigate the effect of the offset ink formulation on deinking of Korean old newspaper, the samples printed with five different types of offset ink were aged naturally for 10, 30, 90, 180 days, and then yield, brightness, fiber length, physical properties(tensile, tear, burst index) were evaluated according to aging time. As the aging time increased, the yield and brightness of respective samples decreased. Particially, as the addition amounts of linseed oil increased, those of samples decreased. Therefore, linseed oil is thought to reduce the deinkability of ink. Also, containing rosin-modified phenolic resin and gilsonite seem to reduce brightness of samples according aging time. In physical properties, tensile index and burst index were roughly decreased, but tear index was increased according to aging time. However, the three indexes of the sample containing only linseed oil as the vehicle component were considerably reduced in comparison with those of other samples, as once crosslinked a strong bond between the ink and fibers was produced and made it difficult to defibrate in producing sheets.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.40 no.3
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• pp.48-52
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• 2008

Waste paper plastic composites were prepared with old newspaper and old corrugated containers and mixed office waste and those properties were evaluated. The results were summarized as fellows. 1. The strength properties like as tensile and Young's modulus reveled most high level in MOW composite. 2. The coagulation of fibers in paper particle should interrupt equal dispersion of polymer and paper particle. 3. The micrograph of the surface of composites showed the most high dispersion in ONP composite.

• Korean journal of communication and information
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• v.78
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• pp.177-205
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• 2016

This study set out to investigate the reality of local press and changes to the occupational identity of reporters through the job mobility of reporters at local newspapers. The study examined what reasons the reporters had when they retired from one of three paper newspapers in Daejeon, where they moved to, and how their career mobility was. Some of them remained in the field of journalism including paper newspapers of the same kind and Internet newspapers, and others moved to various areas including politics, administration, academy, economy, and culture and art. The biggest number of them said they left their old paper newspapers because of poor wages and welfare benefits and absence of future visions. Their decision of leaving their old paper newspapers was also influenced by restructuring, restrictions to coverage and reporting, and great workload. Before the IMF foreign currency crisis in 1997, the press labor market was a typical internal labor market with the practitioners joining a newspaper in open recruitment and climbing up the promotion ladder from a common reporter through Deputy Head and Head of a department to Director of a bureau. The emergence of new media and the financial difficulties of newspaper corporations were currently making the internal labor market worse. Reporters made active use of social capital such as regionalism, alumni ties, and news beats rather than changing jobs by increasing their professionalism through self-development, thus causing side effects including the weakened supervision and criticism functions of local newspapers and damaging their occupational identity as reporters.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2011.10a
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• pp.39-41
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• 2011

The recycling rate of recovered paper in Korea is the highest in the world, 92%, but remanufacturing yield is low due to the extremely poor quality of the paper. The poor quality, in turn, influences to the reject amount in deinking process. To increase the yield of old newspaper recycling process, hydrophobic degree of inorganic pigments of deinking stock must be reduced. To determine the hydrophobicity, Pitch Potential Deposit Tester (PDT) was newly designed and applied with respect to the SB latex property of various quality used in Korea; its hydrophobic degree according to Tg, gel content, charge and particle size of latex and optimum designing condition of SB latex. And below are the conclusions: 1. The reason of excessive reject from old newspaper deinking process for total amount of printed ink is loss of inorganic pigments. When lipase, a biochemical catalyst, was applied with the purpose of preventing inorganic pigments loss about more than 70% of total reject weight and promoting hydration of pulp for deinking, deinking process yield of pre flotation secondary stage increased remarkably without any changes of deinking efficiency. 2. Lipase improved deinking stock by cutting ester linkage on surface of hydrophobic materials to promote its hydration. From this, it reached the conclusion that hydration degree of stock exercises significant effect on flotation deinking process yield. 3. Inorganic alkali promotes hydration of deinking stock. But there have been needs for more fundamental measures other than inorganic alkali of promoting hydration for yield improvement. For this, this study intended to find out reasons of chemical properties change on surface of hydrophobic material by change of pH. 4. Pitch Deposit Test (PDT) was performed for understanding principle of why surface of coating flake from OMG is hydrophobic and why it becomes hydrophilic when pH of stock is alkaline. As a result of this test, it is determined that swelling property by change of pH of latex film, which were used as coating adhesive is the reason for hydrophobic change. 5. Hydrophilicity of coating flake increased with hydrophilic pigments. And as more of SB Latex adhesive was used and higher of calcium hardness of stock became, its hydrophilicity decreased. SB Latex adhesive film is reformed by mechanical friction. For having hydrophilicity under neutral pH, strong bruising action such as kneading is required. 6. Because swelling of adhesive film decreases as Tg of SB latex gets lower and mean diameter gets smaller, it shows hydrophobicity under neutral pH. This lowers hydrophilicity of coating flake, which leads to easy elimination with flotation reject on DIP process. Therefore, for improving future flotation yield, it is necessary to develop to use eco-friendly clean SB latex by raising Tg and increasing mean diameter for recycling, and as a result, to reduce excessive loss of coating flake as a reject from deinking process.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2007.04a
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• pp.285-297
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• 2007

As the demands of environment protection increase, the pulp mold container is developed to substitute for the plastic cushion materials like EPS(expanded poly styrene). The water-absorbing ratio, tensile strength and compressive strength of pulp mold are important factors to evaluate its shock absorbing characteristics. The study was performed to investigate the effects of the mechanical property changes on the various conditions of temperature and relative humidity for pulp mold containers made of mixed materials on ONP(old newspaper) and OCC(old corrugated container). This study also is evaluated the optimized mixing ratio of materials for making pulp mold by analyzing the changes of physical properties according to a various procured temperature and relative humidity conditions. The results show that the water absorption ratio of sample increased significantly, and tensile strength decreased $20{\sim}30%$, compressive strength decreased $10{\sim}20%$ by increasing relative humidity condition. And the results show that the ONP 50% and OCC 50% was optimized mixing ratio according to the samples.

• Journal of Korean Medical classics
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• v.33 no.3
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• pp.49-61
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• 2020

Objectives : The purpose of this paper is to collect basic data about Seo, Byung-Hyo and lay the groundwork for future analysis of his medical ideas. Methods : The life of Seo in regards to family and relationships was reconstructed through his genealogy and newspaper articles. His medical ideas were analyzed through the treatment records in books and historical material. Results : 1. Seo was primarily a clinician rather than a social worker throughout the Korean Empire and Japanese colonial era. 2. 『Summary of Experienced Old Prescriptions (經驗古方要抄)』 was a concise book that mainly took after the 『New Edition on Universal Relief (濟衆新編)』, supplemented by contents from the 『DongUiBogam(Treasured Mirror of Eastern Medicine)』. 3. It is meaningful that Seo's book restored and developed the single-ingredient prescription tradition of the 『DongUiBogam(Treasured Mirror of Eastern Medicine)』. 4. Seo faithfully followed the tradition of royal court medicine and utilized new prescriptions that were proven effective. Analysis of the prescription contents of 『A royal palace's diary(內殿日記)』 displays such characteristic. Conclusions : Seo, Byung-Hyo could be regarded as a clinician who faithfully inherited and developed 『DongUiBogam(Treasured Mirror of Eastern Medicine)』 and 『New Edition on Universal Relief (濟衆新編)』.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.47 no.6
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• pp.98-105
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• 2015

Demands of thermal recording paper have been increased significantly by increase in usage of invoice, fax, and label. Thermal recording paper was mainly made based on virgin fiber. It is necessary to find a suitable alternative to virgin fiber in terms of environment protectional resources conservation. In this paper, deinking properties of different recovered papers were analyzed in order to use the recovered paper as raw material of thermal recording paper. Recovered paper were ONP, OMG and white ledger. Flotation reject of OMG was high because inorganic pigments in coating layer could be removed by upstream of froth. Brightness of white ledger and OMG were much higher than that of ONP. Therefore, properties of pulp made from the recovered paper could be enhanced with increase in blending ratio of white ledger and OMG. However, blending ratio of OMG caused the increase of flotation reject. Consequently, the optimum blending ratio of ONP, OMG, and white ledger was 3:3:3 for eco-friendly thermal recording paper. Under the condition, brightness was about 70% and ERIC was below 300 ppm.