DE102008009287A1 - Printing substrate i.e. printed sheet, powdering and/or dusting device for sheet printing machine, has separate dosing cylinder adjusted such that one opening is operated in transport direction for dosing of powder mass on substrate - Google Patents

Abstract

The device has a powdering module (10) i.e. cylindrical cyclone, aligning powder portions (11) on a printing substrate (12), and a separate dosing cylinder (13) attached to the powdering module. A common dosing cylinder is attached to powdering modules. The separate dosing cylinder is provided with dosage openings. The separate dosing cylinder is adjusted such that one opening is operated in a transport direction of the powder portions between an outlet opening (16) of the powdering module and the printing substrate for dosing of a powder mass on the printing substrate. An independent claim is also included for a method for powdering and/or dusting of a printing substrate.

Description

The The invention relates to a device for powdering or dusting of printing materials according to the preamble of claim 1. Furthermore The invention relates to a method for powdering or dusting of printing materials according to the preamble of claim 11.

In It is already state of the art in printing technology, printed substrates powdered or dusted with powder particles. In sheetfed presses serves the powdering or pollination of printed sheet to prevent the sheets from blocking in the area of the boom prevent. Furthermore, the powder applied to the printing sheets facilitate the drying of the applied ink.

From the DE 10 2005 019 363 A1 as well as from the DE 10 2005 055 111 A1 In each case devices and methods for powdering or dusting of substrates, in particular of printed sheets are known in which charged powder particles are directed onto the substrate to be powdered. According to the state of the art DE 10 2005 019 363 A1 In a cyclone, accelerated, electrostatically charged powder particles are thrown toward the substrate by means of a rotor. After DE 10 2005 055 111 A1 Electrostatically charged powder particles are directed in the form of a powder-air mixture on the substrate to be powdered.

Of these, Based on the present invention, the problem is based a novel device and a novel method for powdering or dusting of printing materials to create. That before said problem is solved by a device according to claim 1 solved.

According to the invention the or each powdering module at least one separate Dosing cylinder or more powdering at least each associated with a common metering cylinder, wherein the respective metering cylinder has a plurality of metering, and wherein the respective Dosing cylinder is adjustable so that in the transport direction the powder particles seen between an outlet opening of the or each powdering module and the substrate to be powdered at least one of the metering openings of the respective metering cylinder effective for metering the amount of powder reaching the printing substrate is.

about the respective seen in the transport direction of the powder particles between the outlet opening of at least one powdering module and the dosing cylinder positioned to be powdered The exact amount of powder reaching the substrate can be set exactly or metered. For this purpose, the respective metering cylinder is displaceable, in particular relative to the outlet opening of the or each Powder module rotatable, so depending on the relative position the respective metering cylinder relative to the or each powdering module at least one metering opening with a defined metering cross section is effective for metering the amount of powder.

The inventive method for powdering or dusting of printing materials is defined in independent claim 11.

preferred Further developments of the invention will become apparent from the dependent claims and the description below. Embodiments of the Invention are provided without being limited thereto explained in detail the drawing. Showing:

1 : A schematic representation of an inventive device for powdering or dusting of substrates according to a first embodiment of the invention;

2 a detail of the device according to 1 in the direction of view II; and

3 : A schematic representation of an inventive device for powdering or dusting of substrates according to a second embodiment of the invention.

1 and 2 show highly schematic different views of a device according to the invention for powdering of substrates, in particular of printed sheets, the device according to 1 and 2 a powdering module 10 comprises, which in the embodiment of the 1 and 2 is designed as a cylindrical cyclone. With the help of such a cyclone powder particles 11 in the form of a continuous stream of powder particles 11 on a substrate to be powdered 12 directed, namely thrown without supporting airflow.

In the embodiment of 1 and 2 is the powdering module designed as a cyclone 10 a dosing cylinder 13 assigned, wherein the metering cylinder 13 according to 2 several dosing openings 14 having different metering cross-section. In 2 are the metering holes 14 represented by black bars, wherein the metering cross section of a metering opening 14 the larger, the thicker or thicker in 2 the black bar is shown.

The dosing cylinder 13 is so adjustable, namely according to 2 in the sense of the double arrow 15 relative to the powdering module 10 rotatable that in the transport direction of the powder particles 11 seen between an outlet opening 16 of the powdering module 10 and the substrate to be powdered 12 one of the metering holes 14 of the dosing cylinder 13 is effective for metering the amount of powder reaching the printing substrate.

In the illustrated embodiment of the 1 and 2 depends on the rotational position of the dosing cylinder 13 relative to the powdering module 10 a single metering opening 14 for dosing on the substrate 12 effective amount of powder. According to 2 has each of the metering holes 14 thereby over a different dosing cross section.

In contrast, it is also possible that the metering cylinder 13 Having a plurality of metering openings with the same metering cross-sections, in which case depending on the relative position or rotational position of the metering cylinder 13 a different number of metering with equal metering cross sections is effective. This also allows the amount of powder reaching the printing material to be set precisely.

It is likewise possible for the metering cylinder to have a plurality of metering openings with different metering cross sections and / or equal metering cross sections, wherein, depending on the relative position or rotational position of the metering cylinder 13 a different number of metering with different metering and / or same Dosierquerschnitten for metering on the substrate 12 effective amount of powder is effective.

In the embodiment of 1 and 2 runs a rotation axis 17 of the dosing cylinder 13 perpendicular to a cylinder axis 18 of the powdering module designed as a cyclone and thus approximately parallel to an exit direction of the powder particles 11 from the outlet 16 designed as a cyclone powdering module 10 ,

In contrast, it is also possible how 3 shows that the dosing cylinder 13 the trained as a cyclone powdering module 10 concentric surrounds, so the rotation axis 17 of the dosing cylinder 13 with the cylinder axis 18 designed as a cyclone powdering module 10 coincides and thus approximately perpendicular to an exit direction of the powder particles 11 from the in 3 not shown outlet opening of the formed as a cyclone powdering module 10 runs.

The Invention is not based on the use of cyclones Powdering modules limited. Rather, the invention are also used when the powdering module is a powdering nozzle comprising the powder particles with airflow support directed as a powder-air mixture on the substrate to be powdered.

In In this case, then runs the axis of rotation of the dosing either approximately parallel or perpendicular to the exit direction of Powder particles from the outlet opening of the powdering nozzle of the respective powdering module.

The relative rotation of the dosing cylinder 13 can be electromotive with the help of stepper motors or, like 2 shows electromagnetically.

Thus, according to 2 the dosing cylinder 13 a permanent magnet 19 and several on the outer circumference of the metering cylinder 13 positioned, with respect to their polarity changeable electromagnet 20 , wherein by changing the polarity of the electromagnet 20 a rotation of the dosing 13 opposite the permanent magnet 12 can be realized.

in the It is also different from the embodiment shown possible that several powdering modules have a common Dosing cylinder is assigned. Also, it is possible that each powdering module several separate dosing or more Powdering modules associated with several common dosing are.

10

Bepuderungsmodul

11

powder particles

12

substrate

13

metering

14

metering

15

double arrow

16

outlet opening

17

axis of rotation

18

cylinder axis

19

permanent magnet

20

electromagnet

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102005019363 A1 [0003, 0003]
• - DE 102005055111 A1 [0003, 0003]

Claims (12)

Device for powdering or dusting substrates, in particular of printed sheets, with at least one powdering module, with the aid of which powder particles can be directed onto the substrate to be powdered, characterized in that the or each powdering module ( 10 ) at least one separate metering cylinder ( 13 ) or at least one common dosing cylinder is assigned to each of the powdering modules, the respective dosing cylinder ( 13 ) several metering orifices ( 14 ), and wherein the respective dosing cylinder ( 13 ) is adjustable such that viewed in the transport direction of the powder particles between an outlet opening of the or each powdering module ( 10 ) and the substrate to be powdered at least one of the metering ( 14 ) of the respective metering cylinder for metering the amount of powder reaching the printing material is effective. Device according to claim 1, characterized in that the or each powdering module ( 10 ) is a cylindrical cyclone, the cyclone directing a continuous stream of powder particles onto the stock. Apparatus according to claim 2, characterized in that a rotation axis ( 17 ) of the respective metering cylinder ( 13 ) perpendicular to a cylinder axis ( 18 ) of the cyclone and thus runs approximately parallel to an outlet direction of the powder particles from the outlet opening of the cyclone. Apparatus according to claim 2, characterized in that the respective metering cylinder ( 13 ) surrounds the cyclone concentrically, so that a rotation axis ( 17 ) of the metering cylinder ( 13 ) with a cylinder axis ( 18 ) of the cyclone coincides and thus extends approximately perpendicular to an exit direction of the powder particles from the outlet opening of the cyclone. Device according to claim 1, characterized in that that the or each powdering module is a powdering nozzle comprising a continuous stream of a powder-air mixture directed to the substrate. Device according to claim 5, characterized in that that a rotation axis of the respective metering cylinder is approximately parallel to an exit direction of the powder particles from the outlet opening the powdering nozzle runs. Device according to claim 5, characterized in that that of the respective dosing the Bepuderungsdüse surrounds such that a rotation axis of the metering cylinder perpendicular to an exit direction of the powder particles from the outlet opening the powdering nozzle runs. Device according to one of claims 1 to 7, characterized in that the metering orifices ( 14 ) of the respective metering cylinder have different metering cross sections, wherein, depending on the relative position of the metering cylinder ( 13 ) always one of the metering orifices ( 14 ) is effective with the different metering cross sections. Device according to one of claims 1 to 7, characterized in that the metering of the respective dosing cylinder have the same dosing, depending on the relative position of Dosierzylin DERS a different number of metering with the Same metering is effective. Device according to one of claims 1 to 7, characterized in that the metering the respective metering different Dosierquerschnitte have, wherein depending on the relative position of the metering cylinder a different number of metering with the different dosing is effective. Method for powdering or dusting Substrates, in particular of printed sheets, with at least one Powdering module, with the help of powder particles on the to be powdered Be addressed printing material, characterized in that a a plurality of metering dosing such is shifted that seen in the transport direction of the powder particles between an outlet opening of the powdering module and the at least one of the metering orifices to be powdered of the dosing cylinder for metering the reaching on the substrate Powder quantity is effective. Method according to claim 11, characterized in that the same using a device after one or more several of claims 1 to 10 is performed.