The invention relates to a rotary printing press, in particular
Form of an offset sheet-fed rotary printing machine
as such, at least one painting or coating unit
includes. The invention is particularly directed in this context
also on a sheet-fed rotary printing machine in which a painting
or a coating unit by modification of at least one offset printing unit
Out DE 197 29 985 A1
is an offset printing unit for a sheet-fed rotary printing machine known, which is constructed such that, if necessary, a paint job on a substrate under inclusion of a blanket cylinder is feasible. The blanket cylinder is arranged in that offset printing unit in such a way that for the purpose of converting the printing unit into a coating unit, this blanket cylinder can be lifted off a plate cylinder. As part of a Lackwerksbetriebs the paint supply to the blanket cylinder takes place with the involvement of a paint applicator roll. The paint applicator roll is employed in the case of the operation of the printing unit as a coating unit to the blanket cylinder. The applicator roll forms a roller surface which determines the paint application properties and is provided with its own drive device so that the rotational speed of the applicator roll can be adjusted as required independently of the engine speed.
the integration of coating units in rotary printing presses will be
possible in a manner known per se,
special printing effects, especially gloss effects on a substrate
to realize. When processing substrates under inclusion
of coating plants are special adjustments of the printing speed
necessary to ensure adequate drying of the paint before the inlet of the
Substrate, in particular sheets in a subsequent printing unit
or to ensure a sheet delivery.
Invention has for its object to provide solutions that
make it possible
to handle a paint job on a substrate in a way
both in view of a sufficient drying of the paint,
as well as with regard to the expenditure on equipment in the realization of
Printing machine in itself, offers advantages.
This object is achieved according to a first aspect of the present invention by a device for applying paint to a printing material with the involvement of a plate and / or blanket cylinder with:
- A paint transfer device for transferring paint to those plate or blanket cylinders, and
- A pressure cylinder device which, together with the blanket cylinder, defines a printing gap in which the lacquer applied via the blanket cylinder is applied to a printing material which runs over the printing cylinder device,
- - In which in a sheet running direction downstream of the printing nip Bogenabgangsabschnitt a radiator device is provided for irradiating the applied paint on the substrate immediately after leaving the printing nip with paint-curing, and / or paint-drying radiation, in particular light, and
- - In one of the radiator device in the sheet running direction subsequent environmental region of the pressure cylinder device is provided extending parallel to the pressure cylinder device Luftbeaufschlagungseinrichtung, for acting on the irradiated paint with conditioned, especially tempered and / or dried air.
is it possible in an advantageous manner
the drying or curing process
of the transferred to the substrate
Paint immediately after discharge of the printing material from the printing gap
initiate and prelink. Further drying or curing can
still within the same cylinder quadrant by the admission
with conditioned air. The wavelength of that radiation is preferably
in the range of 350 nm to 4000 nm, in particular in the range of 700
nm to 4000 nm. The conditioning of the air is preferably carried out
with regard to a specified humidity / temperature condition.
The conditioning can also be a filtering or gas admixing
According to one
particularly preferred embodiment
The invention relates to the radiator device as an IR cold radiator device
educated. This will make it possible
the paint drying process by light in the infrared range in the immediate
Machine components such as coating unit, blower or beater
to initiate. Alternatively to this measure, or possibly in combination
hereby it is possible
form the radiator device as a UV radiation device, for
Initiation or support
the paint hardening by
Light in the UV range.
The Luftbeaufschlagungseinrichtung is preferably designed so that it causes such a diffuse radiation of the air that the guidance of the printed or painted sheet is not affected by the radiated air. In mechanically relatively stable substrates, it is possible to form the Luftbeaufschlagungseinrichtung as Luftschwertdüsenanordnung so that the air applied to the paint or the substrate air flows film or louvered on the substrate. This makes it possible to achieve a certain shielding of the optionally emission-relevant surrounding region of the radiator device via the air serving for paint drying or paint curing.
is the intensity
and / or focusing by the cold radiating device on the
Substrate applied radiation adjustable adjustable.
This will make it possible
one on the paint thickness, the paint properties and the printing speed
to achieve a coordinated time course of the exposure intensity.
Preferably, a tuning of the wavelength of the Bogenbeaufschlagung
provided with respect to the absorption capacity of the radiation
is the temperature of the applied by the air knife nozzle assembly
Adjustable air adjustable.
This makes it possible, the
by applying air to the paint or the printing substrate
introduced, or possibly derived heat quantity to control. Farther
is preferably also the volume flow of the air adjustable
the special requirements regarding paint drying and bowing. Preferably
is also the moisture of the supplied
Adjustable air adjustable.
According to one
particularly preferred embodiment
the invention is in one between the air knife nozzle assembly
and the pressure nip lying area along the pressure cylinder device
extending shielding provided. This makes it possible, the
and, if necessary, also to reduce the emission input into the coating unit.
This shield can be integrated in a bow guide.
the Luftbeaufschlagungseinrichtung and the cold radiating device
to a drying module, or to summarize an assembly.
The Luftbeaufschlagungseinrichtung and the cold radiating device
this advantageous in a profile ele- ment, in particular an extruded profile element
to get integrated. The shielding can be in an advantageous
Be realized manner in conjunction with that profile element.
Cold radiating device is preferably designed so that this
a cooling jacket arrangement
includes, for the dissipation of waste heat
and possibly for filtering out radiation outside the desired for paint curing
The Luftbeaufschlagungseinrichtung supplied air may possibly under use
the waste heat of
Cold radiator means tempered, in particular pre-tempered and
be pre-dried. This also results for the
the radiator device withdrawn heat still a possible use.
Luftbeaufschlagungseinrichtung and the cold radiating device are
preferably so crowded
arranged that radiation and air
takes place in an angular segment of the pressure cylinder device, the smaller
is as 45 °.
Such a squat configuration of the paint drying unit according to the invention can
advantageous in the between printing gap and the transfer area
on the transfer cylinder circumferential portion of the printing cylinder
to be ordered.
the paint drying it is possible
in a relation to the sheet running direction of the air sword device
subsequent section to provide a Blasfingereinrichtung,
to the substantially tangential, and directed in the sheet running direction
Initiation of the printing material. The air pollutants may be in
integrated a largely closed Beaufschlagungsluftkreislauf
so that any emissions in the area of the coating plant within
This circuit are largely precipitated or filterable. Also
the air circulating here can be actively conditioned, in particular
tempered and dried.
Pressure cylinder device can be arranged downstream of a transfer cylinder device
be, said transfer cylinder means a further Thermoluftbeaufschlagungseinrichtung
assigned. This Thermoluftbeaufschlagungseinrichtung can
in particular in a sheet guiding device
be integrated. This facility can also be equipped with conditioned,
in particular dried and defined tempered air operated
The object stated at the outset continues also by a device
according to the claims
27 or 29 solved.
The invention furthermore also encompasses that indicated by the apparatuses given
Method for applying a paint to a substrate, as well
also the substrates printed using this method
Details and features of the invention will become apparent from the following
Description in connection with the drawing. Show it:
1 a schematic representation for illustrating and further explanation of the structure of an inventively designed portion of a sheetfed offset press with a printing slit downstream in the direction of sheet travel radiator device, and this in turn subordinate Luftbeaufschlagungseinrichtung;
2 a second schematic representation of a portion of a printing press for illustration and further explanation of the structure of a modified printing similar 1 but with a UV radiator device;
3 a third schematic view of a portion of a printing press for illustration and further explanation of the structure of a modified printing similar 2 but with a radiator device comprising both a UV radiator device and an IR radiator device.
In the 1 Sheet-fed offset printing press shown in sections comprises a first printing unit configured as a coating unit 1 and a downstream of this in sheet running direction second printing unit 2 , The first printing unit 1 includes a blanket cylinder 3 , a blanket cylinder 3 associated plate cylinder 4 , as well as a blanket cylinder 3 associated printing cylinder 5 ,
The supply of a not shown here, sheet-shaped printing material via a transfer drum 6 , as such in sheet travel direction before that impression cylinder 5 is arranged. About the transfer drum 6 can be done a sheet job to the printing cylinder from an upstream, not shown here printing unit, or even from the field of sheet-feeding. The first printing unit 1 is configured as a coating unit in this embodiment. For this purpose, "boom side" is an applicator roll 7 and "an investor" a washing facility 8th intended for washing or otherwise cleaning the blanket cylinder 3 or one on the blanket cylinder 3 spanned clichés.
The blanket cylinder 3 and the plate cylinder 4 are arranged in the configuration of the printing unit shown here as a coating unit such that between these two cylinders 3 . 4 there is no contact and insofar no transfer of paint or varnish from the plate cylinder 4 on the rubber cylinder 3 he follows. However, it is also possible to configure this printing unit so that the plate cylinder 4 as possibly also acts as a forme cylinder, via which a defined paint application on the blanket cylinder 3 he follows.
The printing cylinder 5 and the blanket cylinder 3 define a nip DS, in which a carry of the first on the blanket cylinder 3 applied paint on the over the printing cylinder 5 guided substrate is done. In a lying immediately behind the nip DS surrounding area of the printing cylinder 5 is a shielding device 9 provided, in this embodiment by a plate-like, stretched, along the printing cylinder 5 extending body is formed. Through the shielding 9 becomes the running area of one over the impression cylinder 5 subsidized sheet from the overlying interior of the printing unit 1 or the paint applicator provided therein shielded.
In one, with respect to the direction of the sheet also behind the printing nip DS area lying in the illustrated sheetfed offset printing machine is a radiator device 10 provided for irradiating the applied to the substrate paint immediately after leaving the printing gap DS with paint-exciting, the drying or curing serving radiation. The radiator device 10 is formed in this embodiment as an IR cold radiating device for acting on the coated substrate with radiation in the infrared range.
The IR cold radiating device is provided in this embodiment with a transparent or at least translucent cooling jacket, over which a permeable coolant in the infrared range is performed. This coolant is further guided via a heat exchanger device WT, via which the part of the radiator device 10 in the cooling medium coupled heat can be dissipated to the environment.
In the immediate vicinity of the radiator device 10 is an air handling device 11 provided, which serves defined conditioned, in particular tempered and dried air on the already by the radiator device 10 stimulated or predried varnish or spread on the substrate. The air-handling device 11 is formed in this embodiment such that it acts as a squeegee nozzle arrangement, through which air film or louvered can be fed onto the substrate.
The air-handling device 11 may be formed by a profile body, which is preferably made as an extruded profile. In this profile body, a longitudinal channel may be formed, which is provided with a nozzle gap, defined by which air to the impression cylinder 5 is divisible.
According to a particularly preferred embodiment of the invention, the, via the Luftbeaufschlagungseinrichtung 11 supplied air heated to a predetermined temperature. A corresponding heating device can be used in the interior of the Air duct be arranged. It is also possible to preheat the air in advance and to introduce the heated air in the Luftbeaufschlagungseinrichtung.
the air before heating
to dry. For this purpose, preferably a drying device
upstream of the blowing device.
If necessary, the air can be controlled by tap in the area
the heat exchanger device
WT accumulating waste heat
the radiation generated in the region of the radiator device as well
the volume flow or the admission pressure and the admission characteristic,
especially pressure and velocity distribution, the temperature
and the humidity in the area of Luftbeaufschlagungseinrichtung are
preferably adjustable adjustable. It
as well as the intensity of
Air supply depending on
to tune the sheet travel speed, especially for this purpose
a suitable dependence,
for example about
a map to set.
About the shielding device 9 and the air impingement device 11 can be defined directly behind the pressure nip DS a ventilation section over which a largely closed air circulation and optionally solvent precipitation can be accomplished.
In one, in the sheet running direction of the Luftbeaufschlagungseinrichtung 11 in turn following the surrounding region of the printing cylinder 5 , is a blowing finger arrangement 12 provided by which a further injection of the printing material immediately before transfer of the same to a subsequent transfer cylinder 13 can be done. In the rotary printing machine shown here forms the transfer cylinder 13 the subsequent printing or coating unit also still part of the curing in the area of the first printing unit 1 on the substrate applied paint. This is in the area of one, the transfer cylinder 13 associated sheet guiding device another nozzle arrangement 14 provided over which of the transfer cylinder 13 running substrate can also be applied again with possibly defined tempered and / or dried air. The nozzle arrangement provided here 14 is designed so that a blowing of the printing material takes place in a, the sheet running direction opposite direction. The nozzle arrangement 14 can also be advantageously formed by extruded hollow sections, in which the air supply line serving longitudinal channels are provided directly by the profile material. The one connection between these longitudinal channels and the surrounding area of the transfer cylinder 13 forming nozzle or air outlet channels can hereby be drilled in the profile material in a suitable orientation or be formed by inserts with variable Abstrahlkanalausrichtung.
In particular, in conjunction with said air and Strahlungsbeaufschlagungseinrichtung is preferably in one, the transverter cylinder 6 a further radiation source X provided upstream of the Bogenbahnbereich, for acting on the subsequently to be printed sheet side with color-curing or -drocknender radiation and insofar preparatory color-curing or -drocknender treatment.
For the in 2 illustrated embodiment of a sheet-fed offset printing press apply the previous versions mutatis mutandis. Deviating from the variant according to 1 , In this second embodiment, the radiator device is a UV radiation device 15 educated.
In the vicinity of this UV radiation or UV curing device 15 In turn, in the sheet running direction is a Luftbeaufschlagungseinrichtung 11 intended. The air-handling device 11 may be formed so that a profile body provided for forming the same at the same time as a holder for the UV radiation device 15 , as bow guide and optionally also as a shielding device 9 acts.
In the vicinity of the UV curing device 15 can be an IR radiator device, or IR cold radiator Y upstream. In a transverter cylinder 6 upstream Bogenbahnbereich, in particular a to the transverter cylinder 6 Adjacent Zulaufsaltbereich can serve a pre-tempering of the arc IR radiating device X (see 3 ) be provided.
The UV curing device 15 and the air impingement device 11 can be grouped into one unit, which is used in the configuration of the printing unit 1 can be used as a coating unit in an insert section located behind the printing nip DS.
The radiator device 10 . 15 is preferably designed so that the radiation source provided in this is accessible in a simple manner. It is possible in the area of the radiator device 10 . 15 to provide a mirror arrangement through which a predetermined intensity distribution of the by the radiator device 10 . 15 generated light is guaranteed on the substrate.
The invention is not on the foregoing limited embodiments described. For example, it is also possible to apply the inventively provided immediately behind the printing nip DS radiator device and the hereby combined Luftbeaufschlagungseinrichtung in coating plants, which differ in their structure from the printing unit shown here by way of example 1 differ. The concept for paint drying according to the invention is suitable for printing operations with full-surface coating application, as well as for printing operations with only local, for example, defined by a form cylinder paint application.
The coating is preferably carried out via an anilox system on the blanket cylinder 3 or optionally also the plate cylinder. A corresponding paint applicator can, as in 1 represented, preferably cantilever side, but optionally also be arranged on the investor side or at the location of a dampening unit. The paint application can also be done via a paint or water tank or inking or dampening The radiator device can be formed as an IR cold radiator on the pressure nip principle. The Luftbeaufschlagungseinrichtung can be arranged as a thermal air sword immediately behind the IR emitter. The dryer performance can be further increased by the application of thermal air via blowing fingers in the turning module. A, associated with a subsequent transfer cylinder blow box can be provided with a heating coil, or be designed as a blow box with blowing suction elements. Also by such a blow box air can be applied to form "Thermoluftschwertern".
Also for the in 3 illustrated embodiment of a sheetfed offset press apply the previous versions of the 1 and 2 analogous. Deviating from the variant according to 2 , In this third embodiment, the radiator device is designed such that it comprises a UV radiation source UV and an IR radiation source IR. The IR radiation source IR is embodied as an IR cold radiator and is located in the sheet travel direction, upstream of the UV radiation device UV. This combination radiation source can also be used in an advantageous manner 1 described Luftbeaufschlagungseinrichtung 11 be equipped.
In particular in connection with said combination radiation source 20 is preferably in one, a transverter cylinder 6 upstream Bogenbahnbereich provided a further radiation source X, for acting on the sheet to be printed on the sheet side with color-curing or -drocknender radiation.
for paint drying can in one or more printing a
Sheet-fed offset printing machine can be provided. The inventively provided
Integration of a thermal air squeegee device in a radiator device,
In particular, an IR cold radiator is also suitable as a drying device
for fine printing works,
the painting in the printing unit in conjunction with a Eintrommelwendung.
the solution according to the invention is
it is possible
on special cooling equipment
to dispense with the pressure cylinder and the thermal load of
Considerably reduce the printing unit and also the entire printing press.
The solution according to the invention proves
also with regard to achievable emission reductions as
Rubber cylinder is preferably a brush or cloth washer
associated with a washing of the full-area or possibly also
locally blanked blanket or otherwise Lackformträgers allows.
A corresponding washing process can be fully automated after stopping
the painting equipment (end of printing or production interruption)
respectively. A corresponding Lackwerkwascheinrichtung can in an advantageous
Way by modification of known, standard brush or cloth washes
to be provided. It is possible,
the brush washer
To operate so that the with the blanket or otherwise Lackformträger during the washing process
Cooperating brush trim
and turning backwards
is driven. This will allow a largely automated
Unwind cleaning of the coating unit.
- Blanket cylinder
- plate cylinder
- pressure cylinder
- applicator roll
- radiator device
- transfer cylinder
- nozzle assembly
- UV radiation
or UV curing device
- radiation source
- heat exchanger device
- IR cold radiator device