| 1. |
- Bäckström, M., et al.
(author)
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Improved product quality and increased production capacity with impulse technology
- 2009
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In: Pulp & paper Canada. - 0316-4004. ; 110:2, s. 33-36
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Journal article (peer-reviewed)abstract
- Impulse technology is a high-intensity web consolidation technique in which water is removed from a wet paper web by the combined action of mechanical pressure and intense heat. Pilot trials show that impulse technology is a feasible technique for the production of linerboard, paperboard and fine paper. Improved dewatering, combined with enhanced mechanical and surface properties, are benefits that can be obtained.
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| 2. |
- Drotz, Mattias, et al.
(author)
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A laboratory investigation of Superheated Steam Dried pulps
- 2022
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In: TAPPICon Conference 2022. - : TAPPI Press.
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Conference paper (peer-reviewed)abstract
- Superheated steam drying is used commercially for lumber, coal, peat, sludges, but has limited installations towards market pulp applications. The technology has the potential for higher drying rates, lower energy consumption, better product quality, and safe operation. In this investigation, a superheated steam dryer (EXERGYPSSD®) was used for evaluation of wet pulp samples collected from pulp mills for comparison with conventional drying techniques. The evaluation of the superheated steam dried pulps indicated that there are potential quality benefits with the technology. Improvements of bulk and absorption capacity was achieved, but more laboratory, and pilot tests are needed to optimize the technology even more regarding pressure, temperature, and residence time in the dryer.
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| 3. |
- Drotz, Mattias
(author)
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Influence of pulp and process parameters on the strength properties of low grammage laboratory
- 2017
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In: Tissue World Milan 2017.
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Conference paper (other academic/artistic)abstract
- Toilet, towel and facial products have important properties, for example, softness, absorption, wet strength and strength. Research has been undertaken to investigate the influence of pulp and process parameters on the strength properties of low grammage sheets. Various pulps were investigated and their fibre length, fibre width, fines and coarseness were determined. Based on analysis, it has been concluded that fibre length is essential for tear related properties. Compared with a softwood fibre, a crack propagates faster in a hardwood sheet. Although refining improved the tear related properties to a certain extent, it had a negative impact on the dewatering properties and density. This PowerPoint presentation incorporates some stand-alone graphically presented data with minimal textural interpretation.
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| 4. |
- Lindberg, Siv M, et al.
(author)
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Tactile and instrumental characterization of tissue products
- 2015
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Conference paper (other academic/artistic)abstract
- The feeling of softness and smoothness of paper tissue products is an important performance factor in the market place. In a series of panel tests, the relationship between instrumental measurements and perceived softness and smoothness was investigated. Samples of tissue base paper – napkin and toilet paper – were evaluated for surface roughness. The samples were placed on a hard, smooth glass substrate and the respondents used one finger to stroke along the sample surface. Instrumental measurement and characterization were performed using differentinstruments: Emtec TSA and Lena Softness Tester. The results divide the base paper material into product groups, but general mathematical relationships could be found between the test panel and the measurements when normalized in different ways. Measurements using the Lena produced the best correlation with the panel ratings because its principle resembled the method of the test panel most closely. However, a general relationship usingmaterial properties was shown to produce as good an estimator for the surface roughness as the results obtained with the Lena. This relationship consisted of the ratio between the plasticity and the elasticity of the tissue paper (in-plane properties), normalized for thickness. This suggests that those three material properties are fundamental to the perception of surface roughness as evaluated in this study. Using a trained haptic panel to evaluate test samples of similar grammage with variations in furnish and machine operation settings generated a good correlation to the TSA measurement (r=0.9). The panel was more susceptible to variation in furnish than variation in peak pressure, and this was particularly evident for samples evaluated on the Yankee side.
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| 5. |
- Lindblom, A. T., et al.
(author)
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Improved paperboard properties with impulse technology
- 2006
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In: Professional Papermaking. - 1612-0485. ; :1, s. 53-57
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Journal article (peer-reviewed)abstract
- Impulse technology is a high-intensity web consolidation process in which water is removed from a wet paper web by the combined action of mechanical pressure and high temperature. Pilot scale papermaking trials on STFI-Packforsk's research paper machine showed that impulse technology is a viable consolidation process for production of paperboard. Pilot trials showed significant improvements both in product quality and production efficiency. The surface of impulse pressed paperboard presented lower surface roughness and more uniform surface topographythan a reference board consolidated with wet pressing. This resulted in better print uniformity. The increase in surface smoothness was achieved without loss in total bulk, which preserved stiffness. Thus the relationship between surface roughness and bending stiffness was improved. The outgoing solids content after pressing increased at elevated temperatures, which provides a potential for increases in production capacity.
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| 6. |
- Martin, Andrew R., et al.
(author)
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Energy analysis of impulse technology : Research-scale experimental papermaking trials and simulations of industrial applications
- 2004
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In: Applied Thermal Engineering. - : Elsevier BV. - 1359-4311 .- 1873-5606. ; 24:16, s. 2411-2425
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Journal article (peer-reviewed)abstract
- The impact of impulse technology on a system-wide level has been investigated in this study for non-integrated fine paper and linerboard mills. Impulse unit data were obtained from STFI's EuroFEX research paper machine and correlations were developed in order to predict performance (dewatering, electricity consumption) under commercial operating conditions. Mill analyses were conducted for different configurations (i.e. one or two impulse units with and without web preheating) operating with roll temperatures of 200-320 °C. Results show that the ingoing dryness to the dryer section can be increased within a wide span, from 7 to 27 percentage points depending upon the grade and operating parameters. Even though electricity consumption rises dramatically from the inductively heated rolls, overall fuel savings of up to 20% can be achieved with either one or two impulse units operating at 200 °C (external power plant efficiency assumed to be 45%). Impulse technology appears to be neutral in terms of production costs since increases in energy costs are expected to be counterbalanced by savings in feedstock materials and enhanced product quality. Estimates show that this technology can lead to substantial reductions in dryer section sizes for new installations or alternatively enhance productivity in existing paper machines.
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| 7. |
- Martinez, D. M., et al.
(author)
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Dryness and physical properties of paper webs in laboratory-scale impulse processing
- 2001
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In: Drying Technology. - 0737-3937 .- 1532-2300. ; 19:10, s. 2435-2450
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Journal article (peer-reviewed)abstract
- This investigation evaluates the changes in dryness and physical properties of impulse processed paper webs. A laboratory-scale platen press was used to process 60 g/m2 webs under a wide range of pressure impulses and temperatures (23-380°C). The heat transfer rate to the web was also varied by using two different platen materials (steel and copper). Both thermomechanical and bleached kraft pulps were tested, and the dryness, density, surface roughness, and Scott bond were measured for each trial. Results show that dewatering is enhanced with increased temperature, pressure, and nip residence time, while pressure pulse shape and platen material have little influence. An empirical correlation is given to relate sheet dryness to the key process variables. This correlation suggests that resulting dryness values are not unique; that is, different combinations of temperature, pressure, and nip residence time can be used to obtain a similar level of dryness. Physical reasoning was used to develop a second correlation that links the resulting dryness to the density of the completely dried web. Surface roughness decreased with increasing surface temperature, while Scott bond rose sharply under conditions of high temperature and long nip residence time.
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| 8. |
- Odeberg Glasenapp, Astrid, et al.
(author)
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Model pack the corrugated box prediction tool
- 2010
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In: International Paper Board Industry. - 0020-8191. ; 53:4
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Journal article (peer-reviewed)abstract
- The ModelPACK Project by Inventia is part of FP6, the EU's Framework Program for research and technological development. This software tool predicts the structural properties of the corrugated board and the performance of the end product, allowing for optimization of the fiber used. The system also provides accurate predictions concerning the performance of the finished box. The company offers training in the use of ModelPACK and in the importance of material properties for optimal packaging performance. It also characterizes papers, boards and boxes to expand the database used with the tool. The company creates customer specific models or data structures for an optimization of packaging design.
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