EP1862731A1 - Procédé et appareil pour emporter la chaleur produite par une source de rayons ultraviolets - Google Patents

Procédé et appareil pour emporter la chaleur produite par une source de rayons ultraviolets Download PDF

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Publication number
EP1862731A1
EP1862731A1 EP06114748A EP06114748A EP1862731A1 EP 1862731 A1 EP1862731 A1 EP 1862731A1 EP 06114748 A EP06114748 A EP 06114748A EP 06114748 A EP06114748 A EP 06114748A EP 1862731 A1 EP1862731 A1 EP 1862731A1
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EP
European Patent Office
Prior art keywords
filter
quartz
sheets
tubes
cooling liquid
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.)
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Application number
EP06114748A
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German (de)
English (en)
Inventor
Roberto Giampieri
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.)
Individual
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Individual
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Filing date
Publication date
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Priority to EP06114748A priority Critical patent/EP1862731A1/fr
Publication of EP1862731A1 publication Critical patent/EP1862731A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun

Definitions

  • the invention relates to a method and corresponding apparatus for capturing and carrying away the heat produced by a source of ultraviolet rays which would otherwise strike the irradiated surface of the said source, without however reducing the operating temperature of that source and affecting its efficiency.
  • the invention finds industrial application in association with mercury vapour discharge lamps intended for example for the processes of drying and catalysing UV printing pigments on very delicate surfaces such as for example surfaces of paper, wood, plastics materials or others which do not tolerate the high temperatures emitted by the said sources, where approximately 40% of their emitted power is in the infrared band.
  • the known art teaches various solutions which are only partly effective in reducing the temperature irradiated by the said lamps.
  • One solution provides for the use of reflectors with reflecting surfaces and dichroic properties which preferentially reflect the UV radiation and which instead absorb the infrared radiation.
  • This solution substantially reduces the heat towards the printed surface, but makes it necessary to use expensive, bulky and noisy complex means for cooling the said reflectors in order to prevent them from becoming infrared radiation emitters with increasing temperature.
  • Another known solution provides for positioning a strip of high purity quartz, which is therefore permeable to UV rays, between the lamps and the surfaces irradiated in order to form a chamber together with the walls of the lamp-holder and any of the abovementioned dichroic reflectors through which a flow of air is continuously circulated to carry away the excess heat produced by the lamps and prevent this from reaching the irradiated surface.
  • This solution has the disadvantage however that it also cools the lamps and reduces their efficiency.
  • a hollow lenticular filter of very pure quartz within which a liquid which carries away the heat irradiated by the lamp, which has the property of high permeability to UV and which does not change in that property over time, is placed between the lamp and the irradiated surface.
  • the said cooling liquid comprises distilled water, and all the components of the circuit used for circulating and cooling of this liquid are of suitable materials which will not adversely affect the purity characteristics of that liquid.
  • L indicates the lamp emitting UV radiation and S indicates the substrate being irradiated by that lamp, which for example operates continuously in the direction of arrow F.
  • support S is placed beneath lamp L but the relative positions of the two parts may be altered without thereby going beyond the scope of the invention (see below).
  • R1 and R2 indicate reflectors which may have dichroic properties and P diagrammatically indicates the lamp-holder structure.
  • the straight and parallel sides of the filter formed by the said sheets 1-101 are placed within corresponding recesses 3,103 made with sufficient accuracy longitudinally in metal tubes 4,104 of appropriate diameter (see below) and which are only provided on those tubes over a distance equal to their length, as shown by the detail in Figure 3.
  • Tubes 4, 104 have an internal diameter which is very much greater than the distance between sheets 1,101, in such a way as to act as conduits. If the distance between sheets 1,101 is between 2 and 8 mm, for example approximately 5 mm, the internal diameter of tubes 4, 104 will for example be approximately 20-22 mm.
  • the seal between sheets 1, 101 and tubes 4, 104 and between the sheets and front plates 6, 106 is provided by the external application of a suitable material, for example beads of any suitable sealing material, as indicated by 8, 108 and 9, 109.
  • Plates 6, 106 and tubes 4, 104 provide an effective rigid frame to support filtering screen 1, 101 which is for example attached to lamp-holder structure P or any other suitable support by means of appropriate connectors 10 ( Figure 1).
  • one extremity of one of the two tubes is attached through a connection 11, preferably of the universal type, with the delivery of a pump 12 ( Figure 4) circulating a cooling liquid, while the other extremity of the tube is sealed with a cap 13.
  • One extremity of the other tube, for example 104 is connected by means of a connection 111 which is also preferably of the universal type so as not to give rise to any mechanical stresses on the quartz screen to a discharge conduit 14, while the other extremity of the tube is sealed with a cap 113.
  • the liquid which is caused to circulate within filter screen 1, 101 in order to remove the heat produced by lamp L preferably comprises distilled or condensed water, that is water free from impurities which might become coloured by the radiation emitted by lamp L and which would reduce the UV transparency of the cooling liquid.
  • the circuit will be manufactured from suitable materials which will not create impurities.
  • tubes 4, 104, plates 6, 106 and all metal components in the circuit will for example be manufactured from stainless steel or other suitable material. Where possible suitable plastics material may be used instead.
  • FIG 4 shows that conduit 14 forms part of an annular conduit which ends at the inlet to pump 12 and on which are located in series cooling unit 15, for example of the radiator type with an electrically-powered fan and corresponding thermostat sensor, and provided with a tank 16 which may have a corresponding level sensor 116.
  • Thermometric sensors 17, 117 which determine the temperature of the liquid before and after cooling by unit 15 are provided on the annular conduit and a pressure switch 18 which detects whether or not liquid is circulated through conduit 14 and through the filter is located immediately downstream from the filter in question. All the components of the circuit in Figure 4 are controlled by a processing unit 19 which provides the power supply to lamp L only if pressure switch 18 indicates that there is sufficient circulation of liquid in conduit 14. If this is not the case lamp L is kept off during the start-up stage, or is switched off during the operating stage, in order to avoid dangerous overheating.
  • a further filter indicated by 20 and shown by dashed lines in Figure 1 constructed using an interferometry technique through the plasma vacuum deposition of suitable materials onto the said sheet in ultrathin layers may be applied to the outer face of lower sheet 1, that facing printed substrate S.
  • Filter 20 may have transparency properties which differ with the frequencies involved so that it is highly permeable to UV radiation and instead reflects towards the cooling liquid an appreciable part of the residual infrared radiation which would otherwise escape from the cooling liquid.
  • the reduction in the intensity of UV emission due to the presence of interference filter 20 will be substantially similar to that resulting from an increase in the thickness of the intermediate cooling layer in filter D which would otherwise be necessary in order to achieve equivalent aims.
  • conduits 4, 104 may be made of one piece with sheets 1, 101, this assembly D' being produced by extrusion and hot forming as a single piece of very pure quartz having a cross-section substantially in the form of a figure of eight, with an elongated curved central part 1, 101 formed by parallel layers joined in a single piece to longitudinal conduits 201, 301.
  • closure of the extremity of filter D' may be effected through metal plates 6' joined together by means of tie rods 21 provided on the inside of recesses 22 in which the extremities of the quartz moulding D' are housed with intermediate seals 23 having a grooved profile which close upon themselves to form a ring.
  • the filter according to the invention must also be understood to be protected if it is used in ways other than those illustrated in the drawings. If substrate S is mounted vertically the lamp with the filter may be placed on one side of the said substrate with the advantage that it will not damage it if there are any slight leaks or drips of cooling liquid. This advantage may also be achieved when the substrate is in a horizontal plane, by placing the lamp with the filter beneath the substrate. In this case quartz filter D will have its concave curve orientated towards the substrate to prevent any small bubbles of gas accumulating in the intermediate part or, again for the same purpose, the filter may still have its convex surface directed towards the support but with an appropriate transverse inclination so that one of conduits 4,104 or 201, 301 is at a higher level.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP06114748A 2006-05-31 2006-05-31 Procédé et appareil pour emporter la chaleur produite par une source de rayons ultraviolets Withdrawn EP1862731A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06114748A EP1862731A1 (fr) 2006-05-31 2006-05-31 Procédé et appareil pour emporter la chaleur produite par une source de rayons ultraviolets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06114748A EP1862731A1 (fr) 2006-05-31 2006-05-31 Procédé et appareil pour emporter la chaleur produite par une source de rayons ultraviolets

Publications (1)

Publication Number Publication Date
EP1862731A1 true EP1862731A1 (fr) 2007-12-05

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Family Applications (1)

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EP06114748A Withdrawn EP1862731A1 (fr) 2006-05-31 2006-05-31 Procédé et appareil pour emporter la chaleur produite par une source de rayons ultraviolets

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EP (1) EP1862731A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011245479A (ja) * 2010-04-27 2011-12-08 Harison Toshiba Lighting Corp 紫外線照射装置、紫外線照射方法、紫外線照射装置の製造方法
WO2016132324A1 (fr) * 2015-02-19 2016-08-25 Uv Ray S.R.L. Appareil à rayons ultraviolets pour machines d'impression
CN107351533A (zh) * 2017-08-17 2017-11-17 厦门富莱仕影视器材有限公司 印刷机专用风冷低温uv光源

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000407A (en) 1975-04-07 1976-12-28 Illumination Industries Inc. Combined infrared filter and light focusing apparatus for a mercury vapor lamp
US4100418A (en) * 1977-03-04 1978-07-11 Gene D. Hoffman Method of and means for filtering the infrared rays from a source of UV radiation
JPS5853148A (ja) * 1981-09-25 1983-03-29 Toshiba Electric Equip Corp 紫外線照射器具
US5321595A (en) 1992-09-04 1994-06-14 Amjo Infra Red Dryers, Inc. Double bulb mercury vapor lamp apparatus
JPH06267509A (ja) * 1993-03-10 1994-09-22 Iwasaki Electric Co Ltd 紫外線照射用光源
US5722761A (en) * 1993-12-01 1998-03-03 Nordson Corporation Lamp assembly with filter producing variable proportions of ultraviolet and infrared radiation
DE19651977A1 (de) * 1996-12-13 1998-06-18 Michael Bisges UV-Bestrahlungsvorrichtung
US20020190225A1 (en) * 2001-06-13 2002-12-19 Burgio Joseph T. Apparatus for limited-heat curing of photosensitive coatings and inks

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000407A (en) 1975-04-07 1976-12-28 Illumination Industries Inc. Combined infrared filter and light focusing apparatus for a mercury vapor lamp
US4100418A (en) * 1977-03-04 1978-07-11 Gene D. Hoffman Method of and means for filtering the infrared rays from a source of UV radiation
JPS5853148A (ja) * 1981-09-25 1983-03-29 Toshiba Electric Equip Corp 紫外線照射器具
US5321595A (en) 1992-09-04 1994-06-14 Amjo Infra Red Dryers, Inc. Double bulb mercury vapor lamp apparatus
JPH06267509A (ja) * 1993-03-10 1994-09-22 Iwasaki Electric Co Ltd 紫外線照射用光源
US5722761A (en) * 1993-12-01 1998-03-03 Nordson Corporation Lamp assembly with filter producing variable proportions of ultraviolet and infrared radiation
DE19651977A1 (de) * 1996-12-13 1998-06-18 Michael Bisges UV-Bestrahlungsvorrichtung
US20020190225A1 (en) * 2001-06-13 2002-12-19 Burgio Joseph T. Apparatus for limited-heat curing of photosensitive coatings and inks

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 140 (E - 182) 18 June 1983 (1983-06-18) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 672 (E - 1646) 19 December 1994 (1994-12-19) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011245479A (ja) * 2010-04-27 2011-12-08 Harison Toshiba Lighting Corp 紫外線照射装置、紫外線照射方法、紫外線照射装置の製造方法
WO2016132324A1 (fr) * 2015-02-19 2016-08-25 Uv Ray S.R.L. Appareil à rayons ultraviolets pour machines d'impression
CN107351533A (zh) * 2017-08-17 2017-11-17 厦门富莱仕影视器材有限公司 印刷机专用风冷低温uv光源
CN107351533B (zh) * 2017-08-17 2023-03-14 厦门富莱仕影视器材有限公司 印刷机专用风冷低温uv光源

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