Abstract:
A method for producing markings (MRK1 ) on a moving web (WEB1 ) comprises: - moving the web (WEB1 ) in a longitudinal direction (SX), - delivering laser light (LB2) to a moving aiming point (SP2) by using a first beam steering body (100) and a second beam steering body (200) such that the position (x(t),y(t)) of the aiming point (SP2) depends on the angular orientation (a) of the first body (100) and on the angular orientation (β) of the second body (200), - rotating the second body (200) from a first angular orientation (β1 ) to a second angular orientation (β2), the rotation from the first angular orientation (β1 ) to the second angular orientation (β2) defining a writing period (TA), wherein the rotation of the second body (200) during the writing period (TA) moves the aiming point (SP2) such that the average longitudinal velocity component (vx2) of the aiming point (SP2) is in the range of 50 to 150% of the velocity (v^ of the web (WEB1 ), - rotating the first body (100) such that the aiming point (SP2) crosses a longitudinal reference line (YREF) a plurality of times during the writing period (TA), and - controlling the intensity of the laser light (LB2) according to the angular orientation (a) of the first body (100) and according to the orientation (β) of the second body (200).
Abstract:
The invention relates to a method and an arrangement for measuring the nip pressure and/or pressure profile in the nip of a printing unit of a printing press. A force and/or pressure sensor, such as a pressure sensitive film, for example, an EMFi film sensor, is installed on the counter roller, rubber roller or roller forming the nip of a printing unit which participates in the printing unit in transferring printing ink onto the paper, plastic or other thin sheet-like material surface, wherein the pressure sensitive film is adapted to produce, in connection with a deformation of the force and/or pressure sensor, an electrical signal corresponding to the magnitude of the deformation. The rollers forming the nip are caused to rotate in relation to one another such that the nip pressure of the nip causes a deformation of the force and/or pressure sensor producing an electrical signal corresponding to the deformation of the nip. The nip pressure and/or pressure profile of the nip is calculated by using the electrical signal produced by the deformation of the force and/or pressure sensor.
Abstract:
A method of producing markings on a web (WEB1) comprises: - forming a first base portion (DOT0) in a primary web (WEB0) by locally altering at least one optical property of the primary web (WEB0) with a first laser beam (LB1), and - forming a covered web (WEB1) by covering and/or impregnating the primary web (WEB0) with an additive (AD1) after the first base portion (DOT0) has been formed, wherein the primary web (WEB0) comprises cellulose fibers, the covered web (WEB1) comprises an optically detectable first altered portion (DOT1), the first altered portion (DOT1) comprises the first base portion (DOT0) and an amount of additive (AD1) bound to the first base portion (DOT0), and the composition of the additive (AD1) has been selected such that exposing the covered web (WEB1) to a second laser beam (LB2) causes an optically detectable alteration of the additive (AD1) contained in the covered web (WEB1) in a situation where the intensity of the second laser beam (LB2) is equal to a minimum threshold intensity (IMIN,1) needed to cause optically detectable alteration of the primary web (WEB0) contained in the covered web (WEB1).
Abstract:
The present invention relates to a method and an apparatus for producing the raw material (46) used in producing black dye pigment. The invention further relates to a raw material (46) for producing black dye pigment as well as to the use of ash (20, 24, 26) separated from the raw synthetic gas (12, 14, 18) in the purification of the raw synthetic gas (12, 14, 18) generated in the gasification of a biomass (2, 4, 6) for producing black dye pigment.
Abstract:
The invention relates to a method for adjusting the printing process in which, at some process site of the printing press, the cross-directional profile of tension of the paper web in the machine direction is measured from at least one roller. The tension profile obtained as a measurement result is compared to an earlier basic tension profile after which the deviation and/or profile difference between the basic tension profile and the measured tension profile is analysed. The printing process is adjusted on the basis of the deviation and/or profile difference. The invention also relates to a computer program into which is fed the information obtained from the method according to the invention and which guides the automatic adjustment of the printing process, and the printing press guidance model which is obtained by using the information obtained from the method according to the invention.
Abstract:
The invention relates to a paper that is formed of a fibre-based source material and is applicable as printing paper. According to the invention, the surface of the paper is surface-treated by arranging sufficient density on the surface, such that a mixture is arranged at least on one side of the surface of the paper for forming a surface layer, which mixture comprises pigments in an amount of 75 - 95% by weight of the dry weight and bonding agent in an amount of 5 - 25% by weight of the dry weight, and the porosity of the surface layer of the paper is less than 0.07ml/g as defined by mercury porosimeter process. Furthermore, the invention relates to a method for making paper.
Abstract translation:本发明涉及一种由纤维基材料形成的纸,可用作印刷纸。 根据本发明,通过在表面上布置足够的密度来对纸的表面进行表面处理,使得混合物至少布置在纸的表面的一侧以形成表面层,该混合物包含颜料 干重量的75-95%(重量)和粘合剂的量为干重的5-25%(重量),纸的表面层的孔隙率小于规定的0.07ml / g 通过水银孔隙度计工艺。 此外,本发明涉及一种制造纸的方法。
Abstract:
The invention relates to a paper that is formed of a fibre-based source material and is applicable as printing paper. According to the invention, the surface of the paper is surface-treated by arranging on the surface sufficient density in such manner that the density of at least one surface layer of the paper is sufficiently high to yield a Gurley-Hill value of over 7000s/100ml as measured from the entire paper. Furthermore, the invention relates to a method for making paper.
Abstract:
A method for producing markings (MRK1, MRK2) on a web (WEB1) comprises forming a first altered portion (DOT1) of the web (WEB1) by directing a laser beam (LB2) to the web (WEB1) so as to locally reduce the 5 fluorescence yield of the web (WEB1) at the location of the first altered portion (DOT1), wherein the web (WEB1) comprises cellulose fibers and a fluorescent substance, and wherein the visual contrast between the first altered portion (DOT1) and a reference portion (REF1) is smaller than or equal to 5% when the web (WEB1) is illuminated by substantially white 10 visible light (VIS0), which does not contain ultraviolet light (UV0).
Abstract:
The invention relates to safety paper provided with an authentication for authenticating the paper. In the safety paper according to the invention, the base paper is provided with a structural deviation comprising at least one or some of the following: one or more perforations holes thinner/thicker spots/areas thinner/sparser spots or areas, or colouring agent layers applied onto the base paper. Furthermore, the structural deviation is covered with a coating material layer. The coating material layer covers at least one side of the base paper substantially entirely in such a way that the overall thickness of the paper is primarily constant over the whole area of the paper. However, the coating material of layer has a different thickness at the structural deviations with respect to the other areas of the paper. The invention also relates to a method for manufacturing the safety paper according to the invention.
Abstract:
The invention relates to a method for diagnosing the printing process. In particular, the invention relates to ascertaining a need for maintenance of the rollers, wherein the need for maintenance of the rollers is ascertained on the basis of the cross-directional profile of tension of the web in the machine direction measured from the web. The invention also relates to a method for aligning the web of a web printing process in which on at least one roller is installed at least one pressure sensitive sensor on the surface or under the coating of the roller. Preferably, said pressure sensitive sensor measures the location of the edge of the web, preferably from both ends independently.