EP3259133A1 - Ultraviolet ray apparatus for printing machines - Google Patents

Ultraviolet ray apparatus for printing machines

Info

Publication number
EP3259133A1
EP3259133A1 EP16714527.5A EP16714527A EP3259133A1 EP 3259133 A1 EP3259133 A1 EP 3259133A1 EP 16714527 A EP16714527 A EP 16714527A EP 3259133 A1 EP3259133 A1 EP 3259133A1
Authority
EP
European Patent Office
Prior art keywords
support
source
printed
optical element
ultraviolet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16714527.5A
Other languages
German (de)
French (fr)
Inventor
Alberto MAIANO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uv Ray Srl
Original Assignee
Uv Ray Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uv Ray Srl filed Critical Uv Ray Srl
Publication of EP3259133A1 publication Critical patent/EP3259133A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0406—Drying webs by radiation
    • B41F23/0409—Ultra-violet dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers

Definitions

  • the present invention relates to an ultraviolet ray apparatus for printing machines and to a printing machine comprising such an apparatus.
  • printing machines for example but not only graphic art printing machines, which employ ultraviolet ray light sources for the polymerization of inks, paints, lacquers and the like.
  • ultraviolet ray sources are used for the polymerization of inks, paints and the like.
  • UV-reactive inks allows to speed up the printing process further and obtain a quick drying of the inks themselves by means of exposure to ultraviolet rays.
  • UV lamps ultraviolet ray apparatuses
  • UV lamps comprise other components besides a lamp as explained in greater detail below, for drying the inks used in high-speed reel and sheet printing processes on paper and non-paper supports, and the results which can be achieved are good.
  • a non-uniform distribution of the ultraviolet rays emitted by the UV lamp regretfully occurs when the exposure is static or at slow speed, i.e. when the sheet remains stationary for the entire exposure or remains partially stationary, e.g. if the support to be printed advances intermittently at slow speed.
  • This concentration of UV rays in a focal point creates a non-uniform polymerization of the ink or of the lacquer or of the UV reactive paint and concurrently a temperature increase of the support itself.
  • the temperature increase of the printing support is even more harmful when printing uniform backgrounds with glossy or matte inks on supports having very low melting or deformation points.
  • this is the case of films or labels or supports made of plastic material in general, in particular of polymeric material, which have very low melting or deformation points.
  • the deformation of the support material consequent to the heating caused by the ultraviolet lamp influences printing quality: color registration becomes very difficult if not impossible to obtain because a real expansion or contraction of the support to be printed occurs.
  • ultraviolet apparatuses which comprise a reflector, which is - in general - a surface having a parabolic profile on a cross plane, in addition to the UV source (UVA, UVB, UVC ray) itself, i.e. the lamp itself.
  • Such a reflector is thus arranged over the lamp, on the side opposite to the support to be printed, as known in the prior art.
  • such a reflector is envisaged in order to reflect the UV rays that the lamp emits in all directions to convey the energy towards the support.
  • the concentration of UV rays by the reflector also implies the concentration of infrared rays, and thus an accentuation of the heating phenomenon of the support to be printed in the case of static or slow-speed printing processes in particular.
  • an ultraviolet ray apparatus of the type comprising at least one source of ultraviolet rays, at least one reflector adapted to reflect the ultraviolet and infrared radiation emitted by said source and arranged, with respect to the lamp, on the side opposite to the support to the printed, and at least one optical element interposed between said source of ultraviolet rays and said support to be printed.
  • the apparatus according to the present invention is further characterized in that said optical element is adapted to diffuse the rays emitted by the ultraviolet source either coming directly from the source or reflected by said reflector.
  • FIG. 2 shows, in section, a detail of the ultraviolet ray apparatus according to the present invention taken along a vertical cross plane;
  • FIG. 3 shows a perspective view of a detail of the apparatus according to the present invention, in particular the optical element adapted to diffuse the rays emitted by the ultraviolet source of said apparatus.
  • a printing machine 100 of the type considered here is shown by way of example with particular reference to figure 1 .
  • the present invention relates to an ultraviolet ray apparatus of the type adapted to be installed on a printing machine 100, e.g. of the type used in flexography printing processes, in which one or more apparatuses 10 adapted to emit ultraviolet rays are provided to carry out the polymerization of inks, paints and the like.
  • the support for example paper but also polymeric material films, is moved so that it passes through various printing stations.
  • the ultraviolet ray apparatus 10 comprises at least one source of ultraviolet rays 10a, at least one reflector 10b adapted to reflect the radiation emitted by said source 10a and arranged, with respect to the source, on the side opposite to the support 20 to be printed, and at least one optical element 10c interposed between said source of ultraviolet rays 10a and said support to be printed 20.
  • said source 10a of ultraviolet rays is interposed between said reflector 10b and said optical element 10c.
  • the ultraviolet ray device 10a of the apparatus 10 according to the present invention emits the light radiation in all directions.
  • said light source preferably consists of a discharge lamp, in particular a mercury lamp, which is ionized by effect of an electric arc generated between two electrodes arranged at the ends of said lamp.
  • ultraviolet ray sources of this type emit radiations also in the infrared (IR) field. Such radiations are responsible for the heating of the support 20 to be printed, which can reach a temperature of even 80 ° C.
  • the UV apparatuses of known type in the prior art have attempted to solve the problem of heating of the support 20 to be printed, which heating, as mentioned, is undesired because it causes expansions of the support itself which prevent maintaining the color print in register, by allowing said support 20 to slide on cooled cylinders.
  • the need to provide cooled cylinders complicates the machine making it more complex and consequently more costly and cumbersome.
  • a specific cooling system provided with a cooling liquid circulation pump must also be provided in addition to a supplementary cylinder, which must be provided and moved.
  • filters are used capable of reflecting the radiation in the infrared wavelength, said filters being interposed between the light source and the support to be printed.
  • the infrared filter ends up heating the support 20 in all cases by radiation, not allowing to solve the problem of the heating, and thus of the expansion, of the support 20 to be printed in an effective manner.
  • the UV source 10a reaches 800 ° C in operating conditions, while the infrared filter, generally made of quartz, can even reach temperature close to 200 °C.
  • the UV apparatus comprises an optical element 10c interposed between said ultraviolet light source 10a and said support 20 to be printed.
  • Said optical element 10c is adapted to diffuse the rays emitted by the ultraviolet source either coming directly from the source or reflected by said reflector 10b.
  • said optical element 10c will include a concave-convex lens, preferably a concave-convex lens having the two surfaces, the concave and the convex ones having substantially the same center of the radii of curvature.
  • such a radius of curvature may be comprised between 50 mm and 300 mm, preferably will be 70 mm.
  • said optical element 10c will be interposed between said ultraviolet light source 10a and said support 20 to be printed so as to have the concavity face towards the support.
  • the optical element 10c can diffuse the incident radiation.
  • the optical element 10c is struck by the radiation emitted directly by the ultraviolet light source 10a and by the radiation reflected by the reflector 10b, and diffuses such a radiation so that the ultraviolet rays are either made to diverge or are parallel to one another.
  • the support 20 to be printed is struck by a diffused radiation, not concentrated in a focal point or on a limited area of the said support, as occurs in the prior art.
  • the IR infrared component of the radiation is also diffused by the ultraviolet light source 10a, thus solving the problem of heating of the support 20 to be printed.
  • the infrared component of the radiation is responsible for the heating of the support and/or of the IR filter directly and then, by radiation, of the support in the apparatus of the type known in the prior art.
  • the apparatus of the present invention optimizes the polymerization process of the ink and/or of the light-sensitive ink used in the printing process.
  • the diffusion of the ultraviolet and infrared rays avoids the heating of the support 20 to be printed and the excessive polymerization of the ink and/or the paints allowing to control all the steps of the printing process in optimal manner.
  • the uniform diffusion of the ultraviolet and infrared rays causes the quantity of energy of the electromagnetic waves which radiate the support 20 to be printed, to be also uniformly distributed and there are no concentrations of energy in a focal point or in a small area of the support 20, thus avoiding in particular the detrimental effect of the concentration of infrared rays, in particular in printing processes on plastic films.
  • the concave-convex lens of the optical element 10c is made of quartz glass, or other suitable material, and may have variable size. More in particular, the lens will have the same longitudinal dimension of the lamp to which it is combined, more in general from 60 mm to 2000 mm in length, while the radius of curvature of the lens may be preferably comprised between 50 mm and 300 mm.
  • the concave-convex lens may be obtained from a quartz glass tube having thickness of 2 or 3 mm and radius of curvature comprised between 50 mm and 300 mm, preferably 70 mm.
  • optical element 10c belonging to the apparatus according to the present invention is shown as consisting of a concave-convex lens, it is apparent that said lens may have any geometry, e.g. meniscus, flat-concave or concave- convex with different radii of curvature for the two surfaces, providing it is a negative lens, i.e. diverging.

Abstract

The present invention relates to an ultraviolet ray apparatus for printing machines which is characterized in that it uniformly diffuses the radiation emitted by the source on the support to be printed. The apparatus according to the present invention allows to control the printing process in optimal manner avoiding the heating of the support itself and the deformations deriving from such heating. Thus, the apparatus according to the present invention is particularly effective in case of printing on plastic material film. The apparatus comprises a source (10a) of ultraviolet rays, a reflector (10b) and a negative lens (10c).

Description

ULTRAVIOLET RAY APPARATUS FOR PRINTING MACHINES
FIELD OF THE INVENTION
The present invention relates to an ultraviolet ray apparatus for printing machines and to a printing machine comprising such an apparatus.
More specifically, it relates to printing machines, for example but not only graphic art printing machines, which employ ultraviolet ray light sources for the polymerization of inks, paints, lacquers and the like.
PRIOR ART
It is known that in printing processes, for example but not only in flexography, screen-printing or offset printing processes, ultraviolet ray sources are used for the polymerization of inks, paints and the like.
In the printing machines of the type considered here, it is known to move the support, for example paper but also polymeric material films, so that it passes through various printing stations.
Various printing units arranged in sequence apply ink to the support.
The advantage of this type of printing is that it can be used on many supports: paper, cardboard, plastic, aluminum and other. It allows to use water-based, solvent-based or UV colors.
In particular, the use of UV-reactive inks allows to speed up the printing process further and obtain a quick drying of the inks themselves by means of exposure to ultraviolet rays.
The use of ultraviolet ray apparatuses is thus known, commonly named "UV lamps" although in actual fact they comprise other components besides a lamp as explained in greater detail below, for drying the inks used in high-speed reel and sheet printing processes on paper and non-paper supports, and the results which can be achieved are good.
However, a non-uniform distribution of the ultraviolet rays emitted by the UV lamp regretfully occurs when the exposure is static or at slow speed, i.e. when the sheet remains stationary for the entire exposure or remains partially stationary, e.g. if the support to be printed advances intermittently at slow speed.
In particular, in order to avoid the unnecessary dispersion of energy and to prevent the excessive heating of the casing in which the UV source is contained, it is known to envisage the presence of a reflecting element in the apparatus, which element is in general parabola-shaped and is capable of reflecting the UV rays emitted by the lamp which would otherwise be ineffectively dispersed and concentrating them in a focal point on the support to be printed.
This concentration of UV rays in a focal point creates a non-uniform polymerization of the ink or of the lacquer or of the UV reactive paint and concurrently a temperature increase of the support itself.
As mentioned, these problems are accentuated in static or slow-speed printing processes.
In particular, the temperature increase of the printing support is even more harmful when printing uniform backgrounds with glossy or matte inks on supports having very low melting or deformation points. Above all, this is the case of films or labels or supports made of plastic material in general, in particular of polymeric material, which have very low melting or deformation points.
The deformation of the support material consequent to the heating caused by the ultraviolet lamp influences printing quality: color registration becomes very difficult if not impossible to obtain because a real expansion or contraction of the support to be printed occurs.
In the field, ultraviolet apparatuses are known which comprise a reflector, which is - in general - a surface having a parabolic profile on a cross plane, in addition to the UV source (UVA, UVB, UVC ray) itself, i.e. the lamp itself.
Such a reflector is thus arranged over the lamp, on the side opposite to the support to be printed, as known in the prior art.
As mentioned, such a reflector is envisaged in order to reflect the UV rays that the lamp emits in all directions to convey the energy towards the support.
Since the drying process of light-sensitive inks and paints is influenced by the light power of the source, the solutions known in the prior art envisage concentrating the UV rays reflected by the reflector in a focal point.
However, rays in the infrared wavelength, which are responsible for heating the support, are also reflected and concentrated, in addition to the ultraviolet rays.
So, although the use of a reflector is inevitable to prevent dispersing the energy of the light source and to preserve the casing of the light source from excessive heating, the concentration of UV rays by the reflector also implies the concentration of infrared rays, and thus an accentuation of the heating phenomenon of the support to be printed in the case of static or slow-speed printing processes in particular. SUMMARY
It is a main task of the present invention to solve the technical drawbacks left unsolved by the prior art by providing an ultraviolet ray apparatus for printing machines which solves the problems of the currently known apparatuses, in particular which optimizes the printing process.
In the scope of this task, it is the object of the present invention to provide an ultraviolet ray apparatus adapted to be installed in printing machines which allows to avoid the heating of the printing support.
It is another object of the present invention to provide an ultraviolet ray apparatus which optimizes the use of the energy emitted by the UV light ray source by eliminating the negative effects of the infrared radiation emitted by the source itself. It is the not last object of the present invention to provide an ultraviolet ray apparatus which ensures a uniform polymerization of the ink or of the printing paint.
This task, and these and the other objects which will be more apparent from a detailed description of the present invention given here by way of non-limiting example, are achieved by an ultraviolet ray apparatus of the type comprising at least one source of ultraviolet rays, at least one reflector adapted to reflect the ultraviolet and infrared radiation emitted by said source and arranged, with respect to the lamp, on the side opposite to the support to the printed, and at least one optical element interposed between said source of ultraviolet rays and said support to be printed. The apparatus according to the present invention is further characterized in that said optical element is adapted to diffuse the rays emitted by the ultraviolet source either coming directly from the source or reflected by said reflector.
Further features can be inferred from the appended claims which form an integral part of the present description.
LIST OF FIGURES
Further features and advantages of the present invention will be more apparent from the following detailed description provided by way of non-limitative example and illustrated in the accompanying figures, in which: - Figure 1 shows an example of printing machine of type known in the prior art of the type considered here;
- Figure 2 shows, in section, a detail of the ultraviolet ray apparatus according to the present invention taken along a vertical cross plane;
- Figure 3 shows a perspective view of a detail of the apparatus according to the present invention, in particular the optical element adapted to diffuse the rays emitted by the ultraviolet source of said apparatus.
DETAILED DESCRIPTION
A printing machine 100 of the type considered here is shown by way of example with particular reference to figure 1 .
The present invention relates to an ultraviolet ray apparatus of the type adapted to be installed on a printing machine 100, e.g. of the type used in flexography printing processes, in which one or more apparatuses 10 adapted to emit ultraviolet rays are provided to carry out the polymerization of inks, paints and the like.
The support, for example paper but also polymeric material films, is moved so that it passes through various printing stations.
Various printing units arranged in sequence apply ink to the support.
With particular reference to figure 2, the ultraviolet ray apparatus 10 according to the present invention comprises at least one source of ultraviolet rays 10a, at least one reflector 10b adapted to reflect the radiation emitted by said source 10a and arranged, with respect to the source, on the side opposite to the support 20 to be printed, and at least one optical element 10c interposed between said source of ultraviolet rays 10a and said support to be printed 20.
According to the described configuration, said source 10a of ultraviolet rays is interposed between said reflector 10b and said optical element 10c.
By virtue of the configuration described and shown here, in particular in the cross section shown in figure 2, the ultraviolet ray device 10a of the apparatus 10 according to the present invention emits the light radiation in all directions.
Indeed, said light source preferably consists of a discharge lamp, in particular a mercury lamp, which is ionized by effect of an electric arc generated between two electrodes arranged at the ends of said lamp.
As known in the prior art, ultraviolet ray sources of this type emit radiations also in the infrared (IR) field. Such radiations are responsible for the heating of the support 20 to be printed, which can reach a temperature of even 80 ° C.
The UV apparatuses of known type in the prior art have attempted to solve the problem of heating of the support 20 to be printed, which heating, as mentioned, is undesired because it causes expansions of the support itself which prevent maintaining the color print in register, by allowing said support 20 to slide on cooled cylinders. The need to provide cooled cylinders complicates the machine making it more complex and consequently more costly and cumbersome. A specific cooling system provided with a cooling liquid circulation pump must also be provided in addition to a supplementary cylinder, which must be provided and moved.
Furthermore, in some types of machines, it is not entirely possible to envisage the installation of cooled support cylinders, and thus in the prior art, filters are used capable of reflecting the radiation in the infrared wavelength, said filters being interposed between the light source and the support to be printed.
However, because of its very nature of warming when struck by radiation and because it is positioned near the support 20 to be printed, the infrared filter ends up heating the support 20 in all cases by radiation, not allowing to solve the problem of the heating, and thus of the expansion, of the support 20 to be printed in an effective manner.
In order to provide some parameters, it is worth noting that the UV source 10a reaches 800 ° C in operating conditions, while the infrared filter, generally made of quartz, can even reach temperature close to 200 °C.
It is thus apparent that the presence of an element having high temperature in the proximity of the support 20 to be printed implies heating by radiation of the support as well.
As known in the prior art, reflectors capable of concentrating the radiation emitted by the source in a focal point, or at the least on an area as limited as possible of the support 20 to be printed, are used in order to optimize the energy consumption of the UV apparatus. However, in this manner, although the exploitation of the emitted energy of the light source is optimized, the problem of the concentration of the infrared rays on the support 20 to be printed is amplified and the heating effect of the IR filter is accentuated, in presence of the same. In order to solve these problems, the UV apparatus according to the present invention comprises an optical element 10c interposed between said ultraviolet light source 10a and said support 20 to be printed.
Said optical element 10c is adapted to diffuse the rays emitted by the ultraviolet source either coming directly from the source or reflected by said reflector 10b. In particular, said optical element 10c will include a concave-convex lens, preferably a concave-convex lens having the two surfaces, the concave and the convex ones having substantially the same center of the radii of curvature.
Even more preferably, such a radius of curvature may be comprised between 50 mm and 300 mm, preferably will be 70 mm.
So, said optical element 10c will be interposed between said ultraviolet light source 10a and said support 20 to be printed so as to have the concavity face towards the support.
Because of its geometric conformation, the optical element 10c can diffuse the incident radiation.
More in particular, with reference to figure 2, the optical element 10c is struck by the radiation emitted directly by the ultraviolet light source 10a and by the radiation reflected by the reflector 10b, and diffuses such a radiation so that the ultraviolet rays are either made to diverge or are parallel to one another.
In this manner, the support 20 to be printed is struck by a diffused radiation, not concentrated in a focal point or on a limited area of the said support, as occurs in the prior art.
By virtue of the diffusion of the radiation performed by the optical element 10c, the IR infrared component of the radiation is also diffused by the ultraviolet light source 10a, thus solving the problem of heating of the support 20 to be printed.
Indeed, as mentioned, the infrared component of the radiation is responsible for the heating of the support and/or of the IR filter directly and then, by radiation, of the support in the apparatus of the type known in the prior art.
By virtue of the presence of the optical element 10c, the apparatus of the present invention optimizes the polymerization process of the ink and/or of the light-sensitive ink used in the printing process. The diffusion of the ultraviolet and infrared rays avoids the heating of the support 20 to be printed and the excessive polymerization of the ink and/or the paints allowing to control all the steps of the printing process in optimal manner. The uniform diffusion of the ultraviolet and infrared rays causes the quantity of energy of the electromagnetic waves which radiate the support 20 to be printed, to be also uniformly distributed and there are no concentrations of energy in a focal point or in a small area of the support 20, thus avoiding in particular the detrimental effect of the concentration of infrared rays, in particular in printing processes on plastic films.
According to an embodiment of the present invention, the concave-convex lens of the optical element 10c is made of quartz glass, or other suitable material, and may have variable size. More in particular, the lens will have the same longitudinal dimension of the lamp to which it is combined, more in general from 60 mm to 2000 mm in length, while the radius of curvature of the lens may be preferably comprised between 50 mm and 300 mm.
Preferably, the concave-convex lens may be obtained from a quartz glass tube having thickness of 2 or 3 mm and radius of curvature comprised between 50 mm and 300 mm, preferably 70 mm.
Although the optical element 10c belonging to the apparatus according to the present invention is shown as consisting of a concave-convex lens, it is apparent that said lens may have any geometry, e.g. meniscus, flat-concave or concave- convex with different radii of curvature for the two surfaces, providing it is a negative lens, i.e. diverging.

Claims

1 . An ultraviolet ray apparatus (10) of the type comprising at least one source (10a) of ultraviolet rays, at least one reflector (10b), adapted to reflect the radiation emitted by said source (10a) of ultraviolet rays to direct it towards a support (20) to be printed, at least one optical element (10c) interposed between said source (10a) of ultraviolet rays and said support to be printed (20), said optical element (10c) comprising a negative lens, characterized in that said negative lens is a concave-convex lens, comprising a concave surface and a convex surface.
2. An apparatus (10) according to the preceding claim, characterized in that said optical element (10c) is adapted to uniformly diffuse the rays emitted by said source (10a) towards said support (20) to be printed.
3. An apparatus (10) according to the preceding claim, characterized in that said optical element (10c) is adapted to diffuse the rays coming directly from said source (10a) and/or reflected by said reflector (10b).
4. An apparatus (10) according to the preceding claim, characterized in that said concave surface and said convex surface of said concave-convex lens have the same radius of curvature.
5. An apparatus (10) according to the preceding claim, characterized in that said concave-convex lens is made of quartz glass.
6. An apparatus (10) according to the preceding claim, characterized in that the concave surface of said concave-convex lens faces towards said support to be printed (20).
7. An apparatus (10) according to any one of the preceding claims, characterized in that said optical element (10c) has the same longitudinal development as the said source (10a) of ultraviolet light.
8. A printing machine comprising one or more apparatuses (10) according to any one of the claims from 1 to 7.
EP16714527.5A 2015-02-19 2016-02-19 Ultraviolet ray apparatus for printing machines Withdrawn EP3259133A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20150241 2015-02-19
PCT/IB2016/050899 WO2016132324A1 (en) 2015-02-19 2016-02-19 Ultraviolet ray apparatus for printing machines

Publications (1)

Publication Number Publication Date
EP3259133A1 true EP3259133A1 (en) 2017-12-27

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WO (1) WO2016132324A1 (en)

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JP6809928B2 (en) * 2017-02-09 2021-01-06 Hoya株式会社 Light irradiation device
CN108638653A (en) * 2018-02-08 2018-10-12 苏州灯龙光电科技有限公司 A kind of efficiently controllable cured source module
CN110466269B (en) * 2019-09-18 2021-11-23 绍兴宏强印染有限公司 Water-based UV (ultraviolet) curing ink direct-injection printing process
CN110962453B (en) * 2019-12-16 2021-05-04 鲁家豪 A printing ink solidification equipment for printing production field guarantees that illumination is even
CN110962454B (en) * 2019-12-20 2021-08-24 佛山市顺德区美月彩印刷有限公司 Printing ink solidification equipment for printing

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US4864145A (en) * 1986-10-31 1989-09-05 Burgio Joseph T Jr Apparatus and method for curing photosensitive coatings
US5667850A (en) * 1996-10-04 1997-09-16 Gavenco, Llc Method of curing with ultraviolet radiation on substrates requiring low heat
DE20316180U1 (en) * 2003-10-17 2004-05-06 Uv-O-Systems E.K. Device for printing with ultraviolet-hardened inks has stationary ultraviolet light source, devices for transmitting light from source to positions to be illuminated on print material near print head
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