DE102007058324A1 - Highly reflective lining element and irradiation arrangement - Google Patents

Abstract

A highly reflective lining element for cladding a thermal radiation assembly having at least one high power radiation source for visible and / or infrared and / or UV radiation, the liner member having a reflective first surface and a heat radiating second surface and one releasable with attachment means Attachment to a lining element support structure of the irradiation arrangement provided massive support with high heat capacity.

Description

The The invention relates to a lining element for wall cladding thermal radiation arrangement and such an arrangement, which at least one high power radiation source for radiation in the visible, near infrared (NIR) or ultraviolet (UV) range having.

to thermal treatment of surfaces, machining of Materials and manufacturing of composites become the industry In many cases applied irradiation procedures, in which the irradiation material with electromagnetic radiation with a significant active component in the near infrared (NIR) range, especially in the wavelength range between 0.8 microns and 1.5 microns, applied and so is heated. Radiation in the UV or visible range However, it is also absorbed and called by many materials corresponding thermal effects. When using UV radiation for processing purposes, such as drying the ink on high-speed print media or for curing special paint formulations, is also next or priority their thermal effect their networking initializing effect for certain polymers of importance.

It is known, for example, the use of irradiation arrangements for drying paints, such as liquid or powder coatings on metal, wood, paper or plastics, see. the patents DE 100 48 361 C1 or DE 101 08 926 C1 the applicant. Also for drying paints, printing inks, glazes or oils, the coated substrate is often exposed to radiation, which penetrates into the coating and partially into the substrate; for more information, see, for example, the patent DE 100 38 896 B4 referred to the applicant. Also for stretch blow molding of plastic products, such. PET containers, corresponding preforms are exposed to radiation; Details can be found for example in the patent DE 197 36 462 C2 the applicant.

at realization of applications of near infrared Irradiation arrangements are often counter reflectors on the Radiation source side facing away from the processed object and / or side reflectors, if necessary. To form a substantially closed radiation space, provided. This is especially true for applications for the irradiation of a fast-promoted Machining article, such as a paper web, a plastic film, a metal strip, an elastomer profile or preforms o. Ä. This results in significant improvements in the treated Product and in litigation.

The reflectors form walls of an irradiation zone or a radiation space. Corresponding arrangements are, for example, the patents DE 198 07 643 C2 and DE 198 57 044 C2 and the publications DE 100 51 641 A1 and DE 100 51 642 A1 to be taken from the applicant. In the WO 2006/07 2282 A1 the applicant finally describes the special lining of a radiation room with tile-like reflector plates with reflective front and radiating back. The unpublished German patent application 10 2006 029 252.9 The applicant describes a wall cladding which has been further improved under certain aspects, and moreover also a specially shaped irradiation chamber.

The in the latter patent applications, more recent In particular, development results enable high-power irradiation arrangements, working with near-infrared radiation (NIR), with little time and cost for maintenance and operate according to small production time interruptions and thus provides significant user benefits. It has become though shown that for certain applications even more advanced Optimizations of the wall cladding are possible.

Of the Invention is therefore the object of providing a further improved lining element of the type mentioned as well as a correspondingly improved irradiation arrangement on which in particular in the case of irradiated goods, which in considerable Can cause contamination of the lining, the average life of the lining elements are increased and thus further savings in maintenance time and costs possible are.

These Task is characterized by a lining element with the characteristics of Claim 1 and an irradiation arrangement according to claim 14 solved. Expedient training of the inventive concept are the subject of the dependent claims.

In pursuit of a different approach than the one mentioned (unpublished) DE 10 2006 029 252.9 is an essential idea of the invention in providing a solid lining element or carrier such, whose function is not almost exclusively based on an extremely high reflectivity of the front, but due to its massive design has a relatively high heat capacity. This ensures that punctual deterioration of the reflectivity of the surface (such as by impinging splashes of material of the material to be irradiated) does not lead to a thermal overload of the lining element, with the risk of burning through Rather, the temperature peaks occurring at points of impaired reflectivity can be compensated for by heat dissipation into the interior of the carrier, so that the lining element as a whole remains intact.

In a preferred embodiment of the invention is provided that the lining element as a composite element of the solid Carrier with high heat capacity and a forming the first surface with the carrier cohesively connected cover made of a metal foil or a thin sheet of metal or a metallised glass or quartz glass layer is executed. This structure is indeed manufacturing technology relatively complex, allows but in a nearly ideal way the combination of a Surface with the highest reflectivity with a material and manufacturing cost-effective Carrier. Specifically, the carrier as rolling or Extruded part made of a metal with high thermal conductivity, in particular aluminum or an aluminum alloy be. In another inexpensive version is the carrier as a mold sintered part of a ceramic, with formed high thermal conductivity.

On the other side, the cover of a flat Composite material, which on a metal sheet support layer a coating with a reflectance of 97.5% or more for Has UV and / or NIR radiation. In particular, this case the free surface of the laminar composite material a transparent oxide or glassy corrosion protection layer on. Specifically, the sheet metal support layer of the composite material made of aluminum or an aluminum alloy.

to Connection of the carrier with the cover come as such known, especially cohesive, connection method considering a compound with high thermal conductivity and thermal stability. In one embodiment is provided that the cover melted onto the carrier or soldered over the entire surface with a high-temperature solder is. Alternatively, the cover may be on the carrier melted or full surface with a high temperature solder be soldered.

Regarding its shape is not particularly subject to the lining element Restrictions, but this can largely on the desired shape of the irradiation room and the subdivision the wall is tuned into individual lining elements. It It is understood that a design in the form of a plate with as simple as possible, incorporated fasteners (Groove, tongue / groove, etc.) cost advantage is.

Of the However, the carrier can certainly be shaped in such a way that the first surface, in particular partially elliptical, parabolic or W-like, curved.

to Attachment of the lining elements may be one of the (outer) Wall of the irradiation chamber provided a wire construction be and the fasteners of the carrier then have a corresponding profiling for snapping or latching of the lining element on this up. Another possibility is the provision of essentially parallel rails as a supporting structure and corresponding Profiling the lining element back for sliding or if necessary, also clipping on these rails, especially for the production a connection of the tongue and groove type.

Further Advantages and advantages of the invention result from the following description of preferred embodiments based on the figures. From these show:

1 a schematic representation of a wall section of an irradiation arrangement according to the invention with a fastening device and a lining element;

2 the entrance of a radiation tunnel of an inventive NIR irradiation arrangement with radiation source and lining element and

3 a schematic cross-sectional view of the arrangement according to 1 and 2 used lining element.

1 shows a section of a wall 11 an irradiation arrangement according to the invention 10 , on the over a fastening device 12 a (here partially cut shown) lining element 13 is attached. The wall 11 is designed as a massive support structure for the process or radiation space. channels 14 serve the passage of cooling fluid, such as water, air or a thermal oil. The simplest and therefore most cost-effective solution is water cooling with water at low pressure. Should the temperature of the wall 11 In operation of the system are above 100 ° C, however, the cooling by water at high pressure, air or oil is also possible.

The fastening device 12 is designed as a quick-release holder made of spring wire. The wire forms two centrally fixed frames or legs 12.1 . 12.2 , The connection to the wall is a riveted joint 15 realized. Varied deviations from the in 1 shown Design of the fastening device 12 are conceivable. Thus, instead of the two frames of spring wire only one frame or there may be more than two frames. These may be attached to the wall via two or more connections; instead of over rivets, as in 1 shown, also screw or other types of connections can be used.

The lining element 13 is on the spring wire frame 12.1 . 12.2 the fastening device 12 clamped. It has to advantageous on one of its sides a receiving area 16 for the spring wire. The distance between the back of the module 14-1 and the surface of the wall 11 is about 2-5 millimeters. The clamped element 13 can be removed without tools or with a simple tool (eg a screwdriver) with little time.

In 2 is an irradiation arrangement according to the invention 10 shown. wall sections 11 form an entrance of a radiation tunnel 17 ,

The wall sections 11 of the radiation room 17 are with the lining elements 13 modular lined. Excluded is a bridge or an irradiation area 18 in the operation of the tunnel 17 is formed by a non-drawn quartz glass, among which a plurality of NIR emitters 19 lies, the NIR radiation in the tunnel 17 radiate.

In operation, irradiation is through the radiation tunnel 17 guided by a conveyor belt not shown. To avoid touching the tape are some of the lining elements 13 each with a shock protection 20 Mistake. This is advantageous instead of attached to the wall of the modules, for example by screwing to allow easy and quick replacement of these modules.

3 shows a schematic cross-sectional view of the structure of a suitably usable in the prescribed arrangement lining element 13 from a solid aluminum or ceramic carrier 13.1 and a cover fixed thereon with high thermal conductivity at the junction 13.2 , The cover 13.2 consists of a thin AL sheet 13a with high rolling quality, on the vacuum deposition of a high-purity AL layer 13b formed and then a highly transparent SiO ₂ layer 13c on the reflective layer 13b is formed. The connection with the carrier 13.1 is by a thermally highly durable and conductive adhesive 13d formed and on the back of the carrier 13.1 is by adhering the same a firmly adhering black and in use state back radiating layer 13e educated. A groove 13f at the back of the carrier 13.1 allows the lining element 13 can be slid onto a support rail (not shown) of an irradiation chamber and is held securely in use there.

In addition to the reflectivity, the radiation capacity of the back of the lining element can be used by blackening to adjust the temperature. Be fastening devices such as those in the 1 and 2 shown, wire-shaped brackets used, the heat conduction through the fastening device with regard to the thermal equilibrium of the lining element can be neglected (however, a low heat dissipation by convection is always done in addition to the heat radiation).

in the Operation of the system thus beat the solvents not or only slightly on the lining of the wall Lining elements down, but remain in gaseous form in the interior of the radiation room and can through a ventilation system be sucked off. Compared to known systems is so significantly reduces the contamination of the reflective system components. cleaning fall in a correspondingly smaller extent.

The Treatment of non-contamination occurs over it In addition, much easier because the soiled modules of the lining if necessary, not cleaned and polished, but only replaced become. Overall, thus shortening the downtime essential. Removed modules can be sorted by type and Degree of contamination, possibly also outside the plant cleaned and later reused.

A Inventive irradiation arrangement is advantageous For example, in drying systems for drying and / or curing of paints usable. Here, an applied to a substrate Paint coating with radiation in the infrared range and / or in the UV range applied. The reflectivity of the lining element The invention can be applied to the specific wavelength ranges used be adapted so that the element in the operation of the plant a Temperature above the boiling point of vaporizing from the paint Solvents.

An irradiation arrangement according to the invention can furthermore advantageously be used in radiation drying installations for drying paints, printing inks, glazes, oils or the like into substances to be permanently introduced into a substrate. The substrate is exposed to radiation which penetrates into the substrate to a certain depth. This causes a drying or hardening of the introduced substances, whereby solvents can be released from the color and / or constituents of the substrate itself. A lining of the radiation space of such a system with the lining element according to the invention also leads here to a significantly reduced contamination and thus lower standstill.

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 10048361 C1 [0003]
• - DE 10108926 C1 [0003]
• - DE 10038896 B4 [0003]
• DE 19736462 C2 [0003]
• - DE 19807643 C2 [0005]
• - DE 19857044 C2 [0005]
• - DE 10051641 A1 [0005]
• - DE 10051642 A1 [0005]
• WO 2006/072282 A1 [0005]
• - DE 102006029252 [0005, 0009]

Claims (16)

Highly reflective lining element for wall cladding a thermal irradiation arrangement, which at least one High-power radiation source for radiation in the visible and / or Infrared and / or UV region, wherein the lining element a reflective first surface and a heat radiating one second surface and one with fasteners for releasable attachment to a lining element support structure the irradiation arrangement provided massive carrier having high heat capacity. A lining element according to claim 1, wherein the lining element as a composite element of the solid support and a first surface forming, with the carrier cohesively connected cover made of a metal foil or a thin metal sheet or a metallized one Glass or quartz glass layer is executed. A lining element according to claim 2, wherein the cover with a thermally highly conductive and heat resistant Glue is glued over the entire surface of the carrier. A lining element according to claim 2, wherein the cover melted on the support or full surface soldered with a high temperature solder. Lining element according to one of the preceding Claims, wherein the carrier is in the form of a plate has, and at least the first surface is level. Lining element according to one of the claims 1 to 4, wherein the carrier is shaped such that the first surface, in particular partially elliptical, parabolic or W-like, curved. Lining element according to one of the preceding Claims, wherein the fastening means of the carrier a profiling for snapping or latching of the lining element on a lining element supporting structure with fixing wires exhibit. Lining element according to one of the preceding Claims, wherein the carrier as a rolling or extruded part made of a metal with high thermal conductivity, in particular Aluminum or an aluminum alloy is formed. Lining element according to one of the claims 1 to 7, wherein the carrier as a molded sintered part of a Ceramic, formed with high thermal conductivity is. Lining element according to one of the preceding Claims, wherein the cover of a flat Composite material consisting of a metal sheet supporting layer Coating with a reflectance of 97.5% or more for Has UV and / or NIR radiation. A lining element according to claim 10, wherein the free surface of the sheet-like composite material a transparent oxide or glassy corrosion protection layer having. A lining element according to claim 10 or 11, wherein the sheet metal support layer of the composite material of aluminum or an aluminum alloy. Lining element according to one of the claims 1 to 6 or 8 to 12, wherein the fastening means of the carrier a profile for lateral sliding onto the lining element support structure, especially in kind a tongue and groove connection, have. Irradiation arrangement which at least one high-power radiation source for radiation in the visible and / or near infrared and / or UV range wherein at least one reflector portion of the high power radiation source or a wall section having a lining element after one of the preceding claims. The irradiation arrangement according to claim 14, wherein a plurality of Wandungsabschnitte a substantially closed radiation space form, which completely with lining elements after a of claims 1 to 13 is lined. Irradiation arrangement according to claim 14 or 15, wherein before each provided with a lining element wall portion a support structure is provided, in which the lining element removable with the fasteners on the carrier intervenes.