Wyniki wyszukiwania - BazTech

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Wybrane parametry wytrzymałościowe pianek celulozowych

Pospiech Piotr, Bieńkowska Maria

Przegląd Papierniczy

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2023

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R. 79, nr 5

270--277

PL

W pracy zbadano wybrane parametry wytrzymałościowe (wytrzymałość na ściskanie, odkształcenie nominalne, moduł sprężystości) laboratoryjnych pianek wytworzonych z włókien celulozowych. Parametrami zmiennymi były stopień zmielenia oraz ilość użytego materiału włóknistego. Określono również wpływ procesu na stopień uformowania oraz jednorodność otrzymanych materiałów.

EN

Selected strength parameters (compressive strength, nominal deformation, modulus of elasticity) of laboratory foams made of cellulose fibres were examined. The variable parameters were the degree of grinding and the amount of fibrous material used. The influence of the process parameters on the degree of formation and homogeneity of the obtained materials was also determined.

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Single-camera system for measuring paper deformations based on image analysis

Pełczyński Paweł, Szewczyk Włodzimierz, Bieńkowska Maria

Metrology and Measurement Systems

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2021

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Vol. 28, nr 3

509--522

EN

The article presents a new technique for measuring paper deformation in unidirectional tensile tests, based on recording and analysis of a series of specimen images. The proposed technique differs from the DIC-based deformation measurement in that the cross-correlation of image data has been replaced with linear filtering. For this purpose, a regular grid of markers is printed on the sample. Filtering the image creates local maxima in the places where markers occur. The developed algorithm finds their location with sub-pixel accuracy. Printing a grid of markers on tested paper and use of reference objects visible in the same image as the paper sample, freed from the need to mechanically connect the camera and the universal testing machine and from the necessity to electronically synchronize their work. The obtained deformation distributions and Poisson’s ratios are in accordance with the literature data which confirms the correctness of the developed measurement technique.

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Distribution of Bending Stiffness of Orthotropic Fibrous Material Based on an Example of Corrugated Board

Kołakowski Zbigniew, Szewczyk Włodzimierz, Bieńkowska Maria

Fibres & Textiles in Eastern Europe

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2020

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Vol. 28, no. 3 (141)

50--54

EN

Commonly known methods for calculating the bending stiffness of corrugated board allow to calculate values related to the machine and cross direction of corrugated board but do not allow to calculate bending stiffness in any intermediate direction. The article presents a method for calculating bending stiffness in any direction in the plane of corrugated board, on the basis of the bending stiffness values in the machine and cross direction. Comparing the results of measurements of bending stiffness in selected directions with those of their calculations, the method proposed was verified and its practical usefulness confirmed.

PL

W artykule przedstawiono metodę obliczania sztywności zginania w dowolnym kierunku w płaszczyźnie tektury na podstawie wartości sztywności zginania w kierunku maszynowym oraz poprzecznym. Porównując wyniki pomiarów sztywności zginania w wybranych kierunkach z wynikami ich obliczeń dokonano weryfikacji zaproponowanej metody i potwierdzono jej praktyczną przydatność.