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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Technical Association of The Pulp and Paper Industry
Journal Basic Information
Journal DOI :
Korea Technical Association of the Pulp and Paper Industry
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Volume & Issues
Volume 47, Issue 6 - Dec 2015
Volume 47, Issue 5 - Oct 2015
Volume 47, Issue 4 - Aug 2015
Volume 47, Issue 3 - Jun 2015
Volume 47, Issue 2 - Apr 2015
Volume 47, Issue 1 - Feb 2015
Selecting the target year
Studies on the Quality Improvement of Printing Paper by Process Controlling of DIP and TMP
Hwang, Sung-Jun ; Lim, Jong-Keun ; Kim, Hyoung-Jin ; Chung, Sung-Hyun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 5~14
DOI : 10.7584/ktappi.2015.47.5.005
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.
The Change in the Properties of Seeding Pad by the Oil Palm EFB Fiber
Kim, Dong-Seop ; Hendrasetiafitri, Citasari ; Sung, Yong Joo ; Kim, Chul-Hwan ; Kim, Se-Bin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 15~22
DOI : 10.7584/ktappi.2015.47.5.015
The crop production technologies keep in improving and the cultivation becomes more standardization owing to the significant developments of various agricultural materials. The artificial soil and base system for root could be one of the major technologies for the modern cultivation especially for controlled horticulture. Although the perlite, cocopeat, and peat moss are the major components of the artificial soil and are broadly used for various application, there is a great need for the new alternative materials for overcoming the low nutrition and the possible shortage of raw materials. In this study, the application of oil palm EFB fiber as an alternative materials for artificial soil especially for the seeding pad components was evaluated. The changes in the structural properties and the functional properties such as moisture holding properties were compared by laboratory produced seeding pads with different mixture of oil palm EFB fiber. The addition of fibrillated EFB fiber resulted in the significant increase in durability of the seeding pad, which showed the possible application of EFB fiber to the seeding pad instead of the wood fiber (UBKP). The moisture holding properties and the germination condition characteristics of the EFB fiber showed the slight less than those of the cocopeat, which require more sophisticated study for improving the functional properties of seeding pad made of the EFB fiber.
A Physico-chemical Change of Dissolving Pulp by Dry Milling and Fractionation
Kim, Taeyoung ; Lee, Songmin ; Heo, Yongdae ; Kim, Jinyoung ; Joung, Yangjin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 23~32
DOI : 10.7584/ktappi.2015.47.5.023
In this study, chemical and physical changes of dissolving pulps which have similar viscosity by dry milling and fractionation were investigated. We used two types of dissolving pulp made from wood and cotton linter fiber, respectively. Dry milling was executed by knife cutter and pulp powders were fractionated by sieve shaker into 4 grades. We analyzed fiber properties, crystallinity index, viscosity, molecular weight of pulp sheet and powders. It was found that poly-dispersity index of cotton linter pulp was smaller than that of wood pulp, meaning that cotton pulp has more narrow molecular weight distribution. It was assumed that these were related to exposure times to chemical treatment which cut cellulose chains not evenly. At least 4 times of chemical treatments for wood pulp were executed and only two times of chemical treatments for cotton linter pulp were done. After dry milling average molecular weight and crystallinity index of cotton linter pulp powders were reduced and these were related to fines content and shape of pulp powders.
Optimization Technology of Thermomechanical Pulp Made from Pinus densiflora (II) - Quantification of Pitch Contents in TMP -
Nam, Hyegeong ; Kim, Chul-Hwan ; Lee, Ji-Young ; Park, Hyunghun ; Kwon, Sol ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 33~42
DOI : 10.7584/ktappi.2015.47.5.033
Pitches contained in thermomechanical pulp negatively influence paper qaulity and pulp and papermaking process. Without controlling TMP pitches suitably, it is hard to make a certain quality of paper. In order to control pitches in TMP, they must be quantitatively recognized by proper tools. One of the most widely used way to detecting TMP pitches is a staining method using a hydrophobic dye such as Sudan IV. Sudan IV could be used with three different protocols including different application of its dissolution, washing, dyeing time, etc. The dyeing protocols were classified into three categories including Stain I, Stain II, and Stain III. In dyeing time, Stain I required more than 24 hours to dye pitches. On the other hand, Stain III could stain TMP pitches with the most brief way. The images of red-stained pitches could be captured by a stereomicroscope with
magnifications, and then quantitatively analysed measuring their numbers and areas by Carl Zeiss AxioVision (ver. 4.8.2) program. Among three protocols, both Stain I and Stain III were the most ideal methods to detect TMP pitches because they detected more pitches and bigger pitch areas compared to Stain II against the same specimen. In particular, it was recognized that Stain III could be used as the most useful tool to detect TMP pitches accurately within several minutes.
Characteristics of Commercial Leaflets Sandwiched in Newspaper (Part 2) - Physical and Strength Properties of Leaflets According to Business -
Yoon, Seung-Lak ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 43~51
DOI : 10.7584/ktappi.2015.47.5.043
This research was performed to investigate the quality of leaflets provided with newspapers. The leaflets were classified according to business types and regions. The physical and strength properties were analyzed. The sizes of leaflets were 2, 4, 8 jeoljis of crown octavo, A3, A4, A5, and B3, B4, B5. Most of them were color printed and both-sides printing was much more popular than one-side printing. The leaflets about electronics, educations, and clothing showed lower density than restaurant business and other areas. The leaflets of electronics, educations, and clothing, and large stores showed lower tensile strength, and those of restaurant businesses and building trades showed relatively high tensile strengths. No differences on the quality of leaflets except for large stores were found according to business areas. Large markets made the leaflets with various types of papers, and low quality papers were also included.
Development of Functional Pulp Tray for Prevention of Static Electricity
Lee, Ji-Young ; Kim, Chul-Hwan ; Nam, Hye-Gyeong ; Park, Hyeong-Hun ; Kwon, Sol ; Lee, Young-Min ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 52~60
DOI : 10.7584/ktappi.2015.47.5.052
Static electricity is an imbalance of electric charges within or on the surface of a material. All packed items that are particularly sensitive to static discharge must be protected by antistatic treatment. Otherwise, static electricity generated by an electrical insulator may cause serious damages to some sensitive electronics. In order to remove or prevent a buildup of static electricity, packed items must be treated with the application of an antistatic agent, which helps any excess charge to be evenly distributed. Functional pulp tray used for packing of electronic goods was developed with application of an antistatic agent. As the concentration of the antistatic agent increased, charging voltage and surface resistance of molded pulps decreased. The increase of humidity in surrounding atmosphere around molded pulps led to the decrease of accumulation of static charges. In conclusion, the surface treatment of the antistatic agent not only reduced or eliminated buildup of static electricity in the surface, but also prevented generation of tiny dirts from molded tray.
Effect of New Organic Filler Made From Oil Palm Biomass on Paperboard Properties
Lee, Ji Young ; Kim, Chul Hwan ; Sung, Yong Joo ; Park, Jong-Hea ; Kim, Eun Hea ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 61~67
DOI : 10.7584/ktappi.2015.47.5.061
As the production of palm oil has been increased, the generation of oil palm biomass is also increased and the utilization of the oil palm biomass become more significant topic. One third of the oil palm biomass is empty fruit bunch (EFB) and the other two thirds are oil palm trunks and fronds. However, the effective use of oil palm biomass has not been developed and most of it is discarded near oil palm plants. In this study, we investigated the applicability of EFB to the paperboard mills, as an organic filler. The new organic filler was manufactured in a laboratory by grinding and fractionating dried EFB powder, and its properties were analyzed. The particles of EFB organic filler were larger and more spherical than those of the commercial wood powder. The use of EFB organic filler resulted in a higher bulk of the handsheets with similar trends of physical strength, compared to those made with wood powder. It was concluded that EFB could be used as a raw material to manufacture organic filler for paperboard production.
Effect of Electron Beam Irradiation on the Properties of Softwood Unbleached Kraft Pulp
Kim, Eun Hea ; Lee, Ji Young ; Jeun, Joon Pyo ; Kim, Sun Young ; Kim, Chul Hwan ; Park, Jong Hye ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 68~73
DOI : 10.7584/ktappi.2015.47.5.068
Electron beam irradiation is also an eco-friendly treatment compared to other physical and chemical treatments. In this study, we attempted to evaluate the possibilities of energy savings by applying electron beam irradiation to the refining process. After softwood unbleached kraft pulp (UKP) was irradiated with electron beams at 50 and 100 kGy, it was beaten in a laboratory beater, and then its freeness and fiber properties were analyzed. The physical properties of their fiber handsheet were also and measured. As the irradiation dose of the electron beam and the beating time increased, lower freeness and fiber lengths of the UKP were observed. Handsheets made from UKP that was irradiated by electron beam and beaten showed a reciprocal relationship with the irradiation dose of the electron beam, in particular, the strength of the handsheets decreased dramatically at 100 kGy of irradiation. Therefore, it was confirmed that electron beam irradiation is effective in reducing the beating time or beating energy. But the irradiation dose must be controlled under 50 kGy to minimize the loss of paper strength.
Development of New Organic Filler for Improving Paperboard Strengths
Lee, Ji Young ; Kim, Chul Hwan ; Park, Jong Hye ; Kim, Eun Hea ; Yun, Kyeong Tae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 74~79
DOI : 10.7584/ktappi.2015.47.5.074
Wood powder is widely used in paperboard mills to increase bulk and reduce drying-energy consumption, but this material also deteriorates paper strength because it interferes with the bonds between fibers. Although there have been many studies done to improve the strength of paperboard containing wood powder, specific applications have not recently been observed in paperboard mills. In this study, we carried out a new approach for improving paperboard strength by developing a new organic filler with the ability to increase the bonds between fibers. The residue of tapioca starch was used as raw material to manufacture an organic filler. The functionalities, including bulk and strength, were evaluated by making handsheets containing either wood powder or tapioca organic filler, or a mixture of the two, and measuring their physical properties. The organic filler showed lower bulk improvement and higher paperboard strength than the wood powder. The mixture of tapioca organic filler and wood powder showed improved paperboard strength compared to wood powder alone. Therefore, tapioca residue can be used as a raw material to manufacture an organic filler for paperboard mills.
Development of an Objective Softness Evaluation Method and Its Standardization for Hygiene Paper
Ko, Young Chan ; Park, Jong-Moon ; Moon, Byoung-Geun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 80~84
DOI : 10.7584/ktappi.2015.47.5.080
Softness is considered one of the most important attributes of hygiene paper such as tissue and towel. Being subjective in nature, however, softness attribute has been generally believed to be impossible to evaluate using objective methods. Hallmark in his pioneering work proposed that tissue subjective softness should be mainly consisted of the bulk softness component and surface softness component. The bulk softness component can be determined by tensile stiffness; the surface softness component by surface tester. The surface friction turns out far more important than the surface roughness in determining the surface softness component. It cannot be too much emphasized that both results of the tensile stiffness and the surface friction should depend on measuring conditions such as an instrument used, sample sizes (e.g., basis weight, length, and width) and operating conditions of the instrument (e.g., gauge length, cross-head speed, size of stylus, and its scanning speed). This indicates that a direct comparison of the test results would be impossible or misleading unless they have been tested under the identical conditions. This may explain why the standard objective test method for tissue softness has not been available at present.
Soda and Soda-AQ Pulps Properties from African Tulip Tree
Lee, Jai-Sung ; Song, Woo-Yong ; Shin, Soo-Jeong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 85~90
DOI : 10.7584/ktappi.2015.47.5.085
To use the African tulip tree (Spathodea campanulata) as raw material for chemical pulping, soda and soda-AQ pulping was investigated. In chemical compositional analysis, lignin contents of African tulip (33.1%) was higher than other hardwood such as Yellow poplar (17.5%), Acacia (27.1%), or Eucalyptus (24.2%). Soda or soda-AQ pulping with African tulip tree resulted in yield at 43.4-44.8% with 29.5-34.5 Kappa number, pulping condition with 20-22% active alkali. Kappa number of African tulip tree pulp was quite higher than other tropical hardwood (Eucalyptus or Accacia) with less yield due to higher lignin content in wood. Fiber length and width of pulp from African tulip tree was similar to Accacia pulp and shorter than eucalyptus pulp.
Effects of Preflocculated Filler Flocs and Nano-sized Coating Binder on Fold Cracking of Coated Paper
Im, Wanhee ; Seo, Dongil ; Oh, Kyudeok ; Jeong, Young Bin ; Youn, Hye Jung ; Lee, Hak Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 91~97
DOI : 10.7584/ktappi.2015.47.5.091
Papermakers wish to increase the filler content of printing and writing grades because it allows saving in production cost through fiber replacement and improving the formation, and optical and printing properties of the paper. However, high filler loading in the base paper has negative side effects. It reduces the mechanical properties of paper and induces cracking at the fold after coating process. Fold cracking is one of the most frequent quality complaints for magazines, high quality books, etc. Two approaches were examined as methods to reduce fold cracking. One approach was to use preflocculated fillers, which was expected to reduce the fold cracking because it would decrease the interfiber bonding. The other approach was to use a new coating binder that gives greater binding power and thereby provides an opportunity of reducing the fold cracking of coated paper. When filler preflocculation was employed in producing the base paper, fold cracking becomes more severe than conventional filler loading condition. On the other hand, use of nano sized binder in coating improved the tensile properties of the coating layer and thereby decreased the crack area. It was shown that tensile properties of coating layer played an important role in fold cracking of coating.
The Evaluation of the Application of Modified Wood Powder Spacers to Liner Board Mill Trials
Seo, Yung Bum ; Yoon, Doh-Hyun ; Sung, Yong Joo ; Gwon, Wan-Oh ; Kim, Jin-doo ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 98~103
DOI : 10.7584/ktappi.2015.47.5.098
The reduction of the energy consumption in papermaking process become more important issue because of the regulation of green house gas (GHG) emission. Since more than half of energy for papermaking process is consumed during drying process, the increase of the drying efficiency would be very important solution for saving energy and reduction of GHG emission. The improvement of drying efficiency could be very difficult for the liner board mill because the liner board are usually made of recycled paper, OCC (old corrugated container). The short fiber and fines originated the OCC lead to compact sheet structure and delay the water flow out during wet pressing process and drying process. The application of lignocellulose spacer could provide more loose wet sheet structure and result in the higher drainage rate and the improved drying efficiency. In this study, the effects of the application of lignocellulose spacer to the liner board mill were evaluated based on the mill trial. In order to overcome the common disadvantage of the spacer, the loss of strength properties, the spacer was pretreated with amphoteric polyelectrolyte during mill trial. The results showed the application of pretreated spacer improved the drying efficiency by reducing steam consumption. And the loss in the strength properties by the spacer could be supplemented by the pretreatment.
Factors Affecting Z-direction Penetration of PVAm Solution into Paper
Choi, Do-Chim ; Won, Jong Myoung ; Cho, Byoung-Uk ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 104~111
DOI : 10.7584/ktappi.2015.47.5.104
Factors influencing penetration of PVAm solution into paper during impregnation were investigated with ultrasonic Penetration Evenness Analyzer (PEA). Paper structure was varied by changing basis weight, freeness of pulp, calendering, and filler addition, and hydrophobicity of paper was varied by adding AKD. In addition, the viscosity of PVAm solution was varied by changing the concentration of PVAm solution. Important factors influencing penetration of PVAm solution into paper were found to be the pore structure and the hydrophobicity of paper, and the viscosity of PVAm solution. Pore structure of paper could be controlled by refining degree and filler addition and hydrophobicity of paper could be controlled by internal sizing. Denser structure of paper, higher hydrophobicity and higher liquid viscosity slowed down the penetration of PVAm solution into paper.
Evaluation of Water Resistance Properties of Pulp Mold depending on the Types of Raw Materials and the Additives
Sung, Yong Joo ; Kim, Hyung Min ; Kim, Dong Sung ; Lee, Ji Young ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 112~119
DOI : 10.7584/ktappi.2015.47.5.112
The pulp mold attract the increasing concern as recyclable, biodegradable, and eco-friendly packaging materials. In order to broaden the applicability of the pulp mold as substitutes of the expanded styrofoam, the properties of various raw materials for the pulp mold were evaluated and the way for improving water resistance properties of the pulp mold were also tested by applying some additives. The higher value in the fines contents and in the water retention value were shown for the TMP (thermomechanical pulp), which resulted in the bulkier pulp mold with the higher moisture absorption property. In case of water resistance properties, the pulp mold made of white ledger stock showed the higher value in water contact angle and very slow water absorption rate. The addition of oil palm EFB fiber showed the improvement in the water resistance of the pulp mold made of UBKP. The effects of various additives on the improvement in the water resistance properties of the pulp mold were tested by using AKD, PVAm, epoxy resin. The application of AKD leaded to the higher increase in the water resistance. The results in this study showed the effects of AKD for the pulp mold could be improved and optimized by the application with fixing agent and by the ageing treatment after production.
Manufacture of Colored Hanji for Interior Materials from Natural Pigments (Part 3) - Functional Properties of Super Eight Colors Hanji Wallpaper -
Lee, Sang-Hyun ; Shin, Yoo-Su ; Choi, Tae-Ho ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 120~126
DOI : 10.7584/ktappi.2015.47.5.120
In this study, we used various dyes from natural pigments such as tumeric, goldthread, indigo, pagoda tree flower, sappanwood, and safflower to make the Hanji wallpaper with super eight colors of yellow, orange, green, turquoise, violet, red, blue, and magenta. As a result of measuring the lightfastness, magenta dyed with sappanwood showed the worst effect, but blue dyed with only indigo showed the best effect. In terms of the spot test by water, red wallpaper dyed with safflower showed the clear spot, but blue, turquoise, and green dyed with indigo resulted in a little spot. The orange, violet, and magenta dyed with goldthread and sappanwood showed antibacterial activity, and the turquoise, green, and blue also has a little antibacterial activity. However, yellow and red didn't show the some result as expected. In the experiment for efficiency of formaldehyde removal, all Hanji wallpapers dyed with natural pigments showed the significant removal effect of formaldehyde, especially turquoise and red were the highest.
Manufacturing of Multi-layer Coated Paper with Eco-friendly Biobinder for Cost Saving (3) - Mill Trial of Eco-friendly Biobinder for Cost Saving -
Lee, Yong Kyu ; An, Guk Heon ; Kim, Chang Su ; Won, Jong Myoung ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 127~133
DOI : 10.7584/ktappi.2015.47.5.127
Recent worldwide trends are to develop the environmental friendly chemicals and processes in order to reduce the global warming and climate change phenomena. One of similar efforts in paper industry is to substitute the petroleum-based SBR latex by starch-based biobinder. The disadvantage of biobinder found through laboratory scale study was the lower dry pick strength than SBR latex. The objective of this study is to confirm the substitutability of SBR latex with biobinder through mill trial. Although biobinder itself gave lower dry pick strength, it was found that the use of SBR latex and biobinder mixture (50:50) could improve the dry pick strength. The introduction of biobinder into coating binder system improved the opacity of coated paper. Optical properties (brightness and whiteness), ink trapping, print gloss and mottling level of paper coated with biobinder system were similar to those of SBR latex.
Application Technology of Environmental-friendly Starch-based Biobinder and Synthesized Binder in order to Substitute SB Latex for Paper Coating (1) - Application of Substitute Binder for Pre-coating Layer -
Lee, Yong Kyu ; Kim, Sun-Goo ; Won, Jong Myoung ; Kim, Young-Hun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 134~140
DOI : 10.7584/ktappi.2015.47.5.134
This study was carried out to evaluate whether EVAc, acryl latex and biobinder could substitute the part of SB latex for pre-coating color formula or not. Different coating colors prepared through the substitution of 30% SB latex with EVAc, acryl latex, and biobinder were applied for pre-coating layer. 100% SB latex is used as a binder for top coating color. The optical properties, gloss, roughness, stiffness, dry- and wet-pick strength were measured. There were no significant differences in the brightness, whiteness, opacity, roughness, ink set-off and gloss of paper coated with 5 different coating colors. However the stiffness, dry- and wet-pick strength were somewhat lower than those of conventional coating color which 100% SB latex was used as a binder. Although the part of SB latex could be substituted with EVAc, acryl latex and biobinder without sacrificing the qualities of coated paper. Further researches on the improvement of stiffness, dry- and wet-pick strength, and the optimization of rheology of coating color in order to improve the qualities of coated paper are strongly recommended.
Application Technology of Environmental-friendly Starch-based Biobinder and Synthesized Binder as a Substitute for SB Latex (2) - Application of Substitute Binder for Top-coating Layer -
Lee, Yong Kyu ; Hong, Seong-Ho ; Won, Jong Myoung ; Kim, Young-Hun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 47, issue 5, 2015, Pages 141~146
DOI : 10.7584/ktappi.2015.47.5.141
This study was carried out to elucidate the partial substitutability of SB latex with environmental-friendly coating binders for coated paper. Starch-based biobinder, ethylene vinyl acetate and acryl-based binder were evaluated for this purpose. Several combinations of above binders were applied to top layer coating, and properties of coating colors and printability were evaluated. When 20% and 30% of SB latex were substituted by acryl-based synthetic binder, ethylene vinyl acetate and biobinder, the brightness, whiteness and opacity of coated paper were similar to those obtained from SB latex. Ink set and stiffness of coated paper manufactured through 20% and 30% substitution of SB latex by biobinder and EVAc were improved, but dry- and wet-pick strength were decreased. The research works on the improvement of dry- and we-pick strength, mechanical stability and rheological properties at high shear condition should be continued for the commercial application of biobinder, EVAc and acryl-based binder.