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    Wyświetlanie 1-7 z 7
    Tytuł:
    Problems regarding stress between offset printing rollers
    Autorzy:
    Jurkiewicz, A.
    Pyryev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/115617.pdf
    Data publikacji:
    2011
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    contact problem
    stress
    offset
    blanket cylinder
    Opis:
    At present, companies show particular care about quality and profit which are inherent with costs. An in adequately set stress between the printing rollers may significantly worsen the quality and increase costs of printing. Until now, a contact between rollers used to be set by a printer, where it was based on his experience. A width of the surface contact was measured or a distance between the form plate or the rubber to the bearer rings (rings made of hardened metal) was calculated. This paper includes a presentation regarding an attempt to solve the contact-related problems by way of mathematical methods.
    Źródło:
    Challenges of Modern Technology; 2011, 2, 2; 27-30
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The change of printouts quality depending on pressure of a blanket cylinder against an impression cylinder and a plate cylinder in offset machine
    Autorzy:
    Jurkiewicz, A.
    Pyryev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/386484.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    optical density
    tone value increase
    contact between cylinders
    gęstość optyczna
    cylinder
    maszyna offsetowa
    Opis:
    According to lots of books, the pressure in offset printing affects the optical density and the quality of printouts. One of the quali-ty parameters is a tone value increase. An advantage of our research method is obtaining printing effects for different pressures on one printout, thus meaning for identical printing conditions. We obtained the same printing conditions through using different amounts of under-lay sheets fixed to the blanket cylinder, under a blanket. The pressure was increased from optimal settings – in accordance with the ma-chine manufacturer’s recommendation. The test printouts were printed using Adast Dominant 515, on a coated and an uncoated paper. The optical density value was measured on the tone value scale from 10% to 100% stepping regularly by 10%. For this scale the tone val-ue increase was computed. The research shows that for both types of paper the optical density and the tone value increase changes not very much above the optimal pressure recommended by the machine manufacturer. A difference in the optical density and in the tone val-ue increase is bigger for coated paper than for uncoated paper. Changes in these two parameters are negligible in places where used form 0 to 4 underlay sheets and are quite significant in the place where 5 underlay sheets were.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 1; 9-15
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship in between compression of the rollers and contact area width and the clamp force
    Autorzy:
    Jurkiewicz, A.
    Pyryev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/115463.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    contact problem
    offset
    blanket cylinder
    rubber blanket
    problem kontaktu
    powierzchnia cylindra
    powierzchnia z kauczuku
    Opis:
    In an offset printing machine the rollers (ink unit) and the cylinders (printing unit) are in contact in a lot of places. The contact surfaces comprise a metal surface and a rubber surface. As appears from findings based on the professional literature and experience of people working in printing houses the issue of contact between ink rollers and printing cylinders in an offset printing machine is of great importance. It has impact on the quality of printouts (generation of printouts errors), consumption of energy, time of making the printing machine ready for operation, wear of the machine’s components and related consumables like ink, dampening solution, paper, ink rollers, plate. During the theoretical studies, the equations were derived to show how the rollers compression depends on the contact area width and clamping force. The equations involve Young’s modulus and Poisson’s ratio of rollers’ materials. The difference between these equations and the so far existing equations has resulted from changing the place of applying the clamping force and involving Poisson’s ratio. The paper includes the comparison of the aforesaid new equations and those known from the literature. Moreover, the relationship in between the contact area width and the compression of metal roller and rubber-covered roller was subject to experimental attempts aimed at verification of the equation presented. In order to measure the rollers compression a clock sensor was used, and for measurement of the contact area width – a device called Roller Nip Control. The results of these measurements are presented in this paper and are compared with the results obtained from the equation derived in the course of theoretical studies using the analytical method.
    Źródło:
    Challenges of Modern Technology; 2013, 4, 2; 31-36
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of pressure force between two cylinders
    Autorzy:
    Jurkiewicz, A.
    Pyryev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/115590.pdf
    Data publikacji:
    2012
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    contact problem
    offset
    blanket cylinder
    rubber blanket
    Opis:
    Cylinders are very important elements in an offset printing machine because after being supplied with ink they transfer a printing image on paper. A type of setting as regards the stress between cylinders affects quality of printouts as well as rate of wear and tear of operating materials and machine’s elements. It is of great importance to provide for accurate calculation of stress force between two cylinders because this allows for setting an adequate contact zone width and cylinders indentation. In the printing unit of the offset machine there occurs contact between a metal cylinder and cylinder with fixed rubber blanket. The said blanket is composed of some layers, where one of them is a compressible layer. Therefore, the problem is not of trivial nature, as the blanket is made of a non-linear material.
    Źródło:
    Challenges of Modern Technology; 2012, 3, 1; 10-14
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Printouts Quality Depending on Too Small Pressure of a Blanket Cylinder Against an Impression Cylinder and a Plate Cylinder in Offset Machine
    Autorzy:
    Jurkiewicz, A.
    Pyryev, Y.
    Kowalczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/115859.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    contact problem
    offset printing
    blanket cylinder
    rubber blanket
    Opis:
    It has been written in many books that correct setting of clamp in a printing offset machine has impact on wear of consumables and machine elements, and quality of printouts. However there has been no clear recipe to do that. In our article we present research on effect of too small pressure between a blanket cylinder against a plate cylinder and an impression cylinder. The challenge was to find method for gaining results of printing with different clamp but with the same printing conditions. During printing, especially when the printing machine stops and starts, a balance between ink and dampening solution is changing. To obtain the same printing conditions with different clamp on the blanket cylinder under blanket, there were fixed underlay sheets with the same thickness and width but different length. To reduce influence of variable thickness of glue the underlay sheets was glued to each other only on the one edge. We printed on two kind of papers: coated and uncoated. The amount of ink transported on paper was adjusted by changing rotation of the ink fountain roller. The spectrophotometer was used to measure optical density. The tone value increase was computed with Murray-Davies equation. While the tone value increase and optical density are very important printout parameters, our research shows how change of pressure changes printing quality. Our results also help to understand behavior of ink under pressure. Depending on paper and clamp ink could penetrate into the paper or spreads on the paper surface.
    Źródło:
    Challenges of Modern Technology; 2013, 4, 4; 12-17
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ciśnienie i docisk oraz szerokość strefy kontaktu między cylindrami i wałkami w drukującej maszynie offsetowej – przegląd literatury
    Pressure, press clamping and width of a contact zone between cylinders and rollers in an offset printing machine – review of the printing literature
    Autorzy:
    Jurkiewicz, A.
    Pyr'yev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/128470.pdf
    Data publikacji:
    2016
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
    Tematy:
    drukowanie offsetowe
    maszyna offsetowa
    nacisk
    strefa kontaktu
    offset printing
    offset printing machine
    pressure
    press clamping
    contact zone
    Opis:
    The printing literature provides different values of pressure between cylinders in the printing unit and between rollers in the ink unit of the offset printing machine. Very often there is no information on whether a given value of pressure is maximum or average. Another frequent problem referred to in the printing literature is that authors do not reveal the source of theorems, equations or other important information. This article includes a set of values collected for pressure, line pressure, press clamping and the contact zone width that have been presented by other authors in their specific articles and books. It also includes definitions of pressure, line pressure, press clamping, indentation of blanket and metric clamping. In addition, the article briefly presents findings of the experimental research related to the contact zone between cylinders and rollers was carried out in the printing unit and in the ink unit until present. This article also gives publication references which provide for different equations concerned with the clamping force of cylinders, their compression or indentation, the contact zone width and the impact the specific stress-strain has on blankets.
    Źródło:
    Acta Poligraphica; 2016, 8; 9-27
    2299-9981
    Pojawia się w:
    Acta Poligraphica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compression of Two Rollers in Sheet-Fed Offset Printing Machine
    Autorzy:
    Jurkiewicz, A.
    Pyr'yev', Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/386229.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    drukarka
    drukarka offsetowa
    tłumienie
    printing machine
    offset printing machine
    damping
    Opis:
    The most important units of sheet-fed offset printing machine, like the ink and dampening systems as well as a printing unit, are composed, in the main, of contacting rollers of various sizes (in case of the printing unit they are named cylinders). Adequate setting of the said rollers is very important, because it has big influence on quality of print-outs. The settings are made experimentally by measuring the width of the contact area in the ink and dampening systems or by computing the clamp parameters – in the printing unit. This paper includes analysis of compression of two rollers depending on a width of the contact area, radiuses of the rollers as well as their Poisson’s ratios and Young’s modules.
    Źródło:
    Acta Mechanica et Automatica; 2011, 5, 4; 58-61
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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