2P-586 The Effect of Dry Strength Agent on Paper Properties

( Febe Margareta ),( Melani Lili ),김형진 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

Dry Strength Agent plays an important role in corrugated Paper Board production. Its main function is to increase the dry strength by strengthening the inter-fiber bonds. Strength is most important for paper board in order to contain and protect various content. Hamzeh, et al. (2012) showed that the dry strength properties of recycled old corrugated carton (occ) pulp could be improved by adding various polymers. In this study we try to adding value of occ pulp by mixing with unbleached softwood kraft pulp and adding 5 type of polymers into it. The ratio of occ and softwood pulp is 7:3, while the concentration of each polymers raging from 0,1 to 0,5%. For better results, we also compare the samples by adding 1% of sizing agent and 0,3 % of binding agent. pH, turbidity, and chemical oxygen demand are analyzed. Furthermore, the physical properties are evaluated such as tensile strength, burst strength, rind crush, and cobb test.

재유화형 분말수지 출입 폴리머 시멘트 모르타르의 건조수축 및 강도특성

연규석,주명기,이현종,김성기,이지원,Yeon, Kyu-Seok,Joo, Myung-Ki,Lee, Hyun-Jong,Jin, Xing-Qi,Lee, Chi-Won 한국농공학회 2006 한국농공학회논문집 Vol.48 No.1

This study was conducted to investigate experimentally the drying shrinkage and the strength properties of redispersible SBR and PAE powder-modified mortars. Polymer-cement ratio, content of shrinkage-reducing agent and antifoamer content were manipulated as the experimental variables. The peculiarity of this study is to obtain a high early-age strength by using the portland cement and alumina cement with the ratio of 8 : 2. Until 7 days of age, the drying shrinkage remarkably increased up to $1\~2\times10^{-4}$, while it tended to decrease as the ratio of polymer to cement ratio and the content of shrinkage-reducing agent increased. Polymer-cement ratio was effective in improving the flexural, tensile and adhesive strengths: As the ratio increased, the strengths correspondingly increased. The flexural strength was in the range of $7\~11$ MPa, the tensile strength was $3.5\~5$ MPa and the adhesive strength was $1.2\~3.9$ MPa. On the other hand, the compressive strength tended to decrease as the polymer-cement ratio increased, and it was in the range of $23\~39$ MPa. All strengths, flexural, tensile, adhesive and compressive strengths, decreased as the content of powder shrinkage-reducing agent increased. It turned out that the polymer-cement ratio influenced more on the behavior of drying shrinkage and the properties of strength than the powder shrinkage-reducing agent did.

Effect of Dry Strength Agent on Tissue Properties

( Melani Lili ),김형진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Main properties of tissue paper are absorbency, strength, and softness. Softness can’t be easily quantified to other paper properties such as strength and absorption. Softness can be categorized as bulk and surface softness, bulk softness is the perception when crumpling tissue by hand while surface softness is perception when finger running over the surface of tissue paper. It is reported that softness is a balance between surface smoothness, bulk, and stiffness. Dry strength is a physical property determined by a paper’s ability to maintain the paper web structure and integrity while being used. A sheet’s dry strength is mainly due to fiber-to fiber bonding which typically hydrogen bonding. In this study, dry strength agent was added to pulp stock for manufacturing tissue by different concentration. Furthermore, tissue properties was evaluated based on addition of dry strength agent.

저평량 골심지의 강도 개선을 위한 멸균팩 재활용 섬유와 건조지력증강제의 적용

최지선,김선용,심별,이광섭,이명구,류정용 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.3

Korean old corrugated containers (KOCC) have insufficient compressive strength because the bonding potential of the unsorted recovered fibers is poor. Compared to the nature of KOCC, the recovered aseptic carton is a high-quality resource produced from virgin pulp, which is expected to improve the strength of a testliner. In this study, the usage of recycled aseptic carton fibers was attempted to improve the strength properties of corrugating medium paper. In addition to recycled aseptic carton fibers, the application of a dry-strength agent was attempted to improve the bonding potential of fibers. Consequently, the compressive strength increased when the retention of fines in the mixed stock of KOCC and aseptic fibers increased. Meanwhile, aseptic carton comprised fibers with high stiffness and low flexibility; hence, the aseptic carton fibers exhibited a higher compressive strength than KOCC but did not fully manifest the efficiency of dry-strength agents. These results suggest that recycled aseptic carton fibers with or without beating should be used to obtain a sufficient compressive strength of the corrugating medium. The selective application of the dry-strength agent to the KOCC instead of the aseptic carton fibers may also be beneficial.

A study on the ion complex copolymer (PAM) for dry-strength agent

정경모,용성문,원종명,이용규,주화명 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

A recent paper industry had many difficulties in connection with demand of the cost reductions due to market changes such as globalization and environmental issues. To seek the best solutions for it, we should deal with requirements for reuse of the raw materials having physical weakness in nature on the closed water system. In this study, ion complex copolymers containing acrylamide were used to improve the weakness of the KOCC on the sheet forming process. Three kinds of the strength agents having cationic/anionic groups were used in difference with viscosity, charge density, and structural complexity. In case of the comparison according to viscosity, it was believed that the burst and compression strength of paper was improved in proportion to increase in viscosity. Meanwhile, in case of the comparison of strength agents having similar characteristic in viscosity, it was founded that the two physical properties of paper were increased in proportion to their ion complexity.

건조지력제를 이용한 재생라이너지의 물성개선에 대한 연구

용성문(Seong Moon Yong),김종일(Jong Il Kim),김성현(Seong Hyun Kim),정경모(Kyoung Mo Jeong),원종명(Jong Myoung Won),이용규(Yong Kyu Lee),주화명(Hwa Myung Joo) 한국펄프·종이공학회 2015 한국펄프·종이공학회 학술발표논문집 Vol.2015 No.10

양생조건에 따른 유기계 폴리머 흙 포장의 특성

황성필(Sungpil Hwang),정재형(Jaehyeung Jeoung),이용수(Yongsoo Lee),류상훈(Sanghun Ryu) 한국지반환경공학회 2014 한국지반환경공학회논문집 Vol.15 No.12

탄소배출을 줄이기 위해 각 분야에서 연구가 활발히 진행되고 있고, 도로분야에서도 아스팔트 및 시멘트를 대체하는 공법을 개발하기 위하여 노력하고 있다. 그러나 고화제 중에서 시멘트는 가격이 저렴하고 성능이 우수하여 이를 대체하기에 어려운 실정이다. 고분자 재료는 가벼우면서도 복합기능을 추가할 수 있도록 가공이 쉬워서 여러 가지 용도로 사용되고 있으며, 제조공정에서 탄소배출이 적어서, 시멘트를 이용한 흙 포장을 대체한다면 그 효과가 크다. 본 연구에서는 고화 원리가 다른 3종류의 유기계폴리머 고화제를 사용하여 공기 중 양생과 건조로에 의한 양생을 적용하여 양생방법에 따른 강도의 차이점을 파악하였다. 유기계폴리머 고화제만을 적용하여 산책로 및 자전거도로의 포장에 사용 가능한지를 파악하여, 3가지 종류의 고화제를 적용한 일축압축강도시험에서 모두가 자전거 도로의 최소 소요강도를 만족하는 것으로 나타났다. 그리고 공시체의 함수비 변화에 따르는 흙 포장체의 강도 특성을 평가하여 상관관계를 제시하고 유기계 폴리머 고화제를 이용한 경우의 적절한 양생방법을 제시하였다. The efforts to reduce carbon emission have been made in many aspects and in road, the study to develop the construction method which will replace asphalt and cement is also underway. But given the low cost and high performance offered by cement, among many solidification agents, it’s difficult to seek the competent alternative. Polymeric material has been used in various ways for its advantages including lightweight and easy process for complex function and generates less carbon emission, and thus it would possibly be efficient if it replaces soil pavement using cement. This study, using three different types of organic polymeric solidification agents with different solidification principle, is intended to identify the difference in strength depending on curing method, natural dry or oven dry. Applicability of organic polymeric solidification agents to walkway and bike lane was investigated and as a result of unconfined strength test, all of them satisfied the minimum strength requirements of bike lane. Furthermore, strength characteristics of soil pavement depending on variation of water content was evaluated to identify the relationship, thereby appropriate curing method using organic polymeric solidification agent is proposed.

탈묵펄프 및 열기계펄프의 공정 조절을 통한 인쇄용지의 품질향상 연구

황성준(Sung-Jun Hwang),임종근(Jong-Keun Lim),김형진(Hyoung-Jin Kim),정성현(Sung-Hyun Chung) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.5

Recently, the use of wood resources has been limited due to global environmental change, like global warming and desertification. It is very critical in Korea’s paper industries because lots of virgin pulp are dependant on direct import from abroad for printing grade of paper. In this work, the alternatively best available technique for reducing the import amounts of BKP (bleached Kraft pulp) was considered by mixing DIP (deinked pulp) and TMP (thermomechanical pulp) for the manufacture of high quality paper. Generally known, the sheet prepared from fibrous raw materials of DIP and TMP has lower strength and optical properties than that prepared from BKP. This study was aimed to improve the sheet quality by using DIP and TMP. 4 kinds of polyelectrolytes were approached to find out the best effects on physical strength and optical brightness improvements, and high retention behaviors with GCC (ground calcium carbonate). In conclusion, amphoteric PAM with 1,000,000 molecular weight (g/mol) and 0.5 charge density (meq/g) was best for the improvement of strength properties with the mixture of DIP and TMP. GCC retention rate was also the highest with cationic-PAM of above 2,000,000 molecular weight (g/mol) and about 2.0-3.0 charge density (meq/g) of strengthening agent.

탈묵펄프 및 열기계펄프의 공정 조절을 통한 인쇄용지의 품질향상 연구

황성준,임종근,김형진,정성현 한국펄프·종이공학회 2015 펄프.종이技術 Vol.45 No.3

Recently, the use of wood resources has been limited due to global environmental change, like global warming and desertification. It is very critical in Korea’s paper industries because lots of virgin pulp are dependant on direct import from abroad for printing grade of paper. In this work, the alternatively best available technique for reducing the import amounts of BKP (bleached Kraft pulp) was considered by mixing DIP (deinked pulp) and TMP (thermomechanical pulp) for the manufacture of high quality paper. Generally known, the sheet prepared from fibrous raw materials of DIP and TMP has lower strength and optical properties than that prepared from BKP. This study was aimed to improve the sheet quality by using DIP and TMP. 4 kinds of polyelectrolytes were approached to find out the best effects on physical strength and optical brightness improvements, and high retention behaviors with GCC (ground calcium carbonate). In conclusion, amphoteric PAM with 1,000,000 molecular weight (g/mol) and 0.5 charge density (meq/g) was best for the improvement of strength properties with the mixture of DIP and TMP. GCC retention rate was also the highest with cationic-PAM of above 2,000,000 molecular weight (g/mol) and about 2.0-3.0 charge density (meq/g) of strengthening agent.

지력증강제 투입에 따른 농업부산물 유기충전제 적용 판지의 물성 평가

이지영(Ji Young Lee),조해민(Hae Min Jo),박태웅(Tae Ung Park),김경민(Kyung Min Kim),김철환(Chul Hwan Kim) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.4

In this study, the effect of dry strength agents on the physical properties of sheets containing organic filler made from rice husk (RH) was investigated. KOCC was used to make handsheets containing RH and empty fruit bunch (EFB), and the bulk and strength of the sheets were analyzed. To determine the effect of dry strength agents on paper strength, handsheets containing 9% RH organic filler were made by adding cationic polyacrylamide (C-PAM) and amphoteric polyacrylamide (Am-PAM) and their strengths were measured. Handsheet bulk increased as the amount of organic filler increased, but a reduction in paper strength was also observed. However, when C-PAM and Am-PAM were added to the stock, the breaking length, compressive strength, burst strength, and stiffness of the handsheets were improved as a function of the level of addition. Significant difference between the performances of C-PAM and Am-PAM was not observed as the level of addition increased from 3% to 9%. Ultimately, it was concluded that the use of dry strength agents could be a solution for the reduction in paper strength when organic fillers are applied.