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
  • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
  • F26B25/001—Handling, e.g. loading or unloading arrangements
  • F26B25/003—Handling, e.g. loading or unloading arrangements for articles
  • F26B25/004—Handling, e.g. loading or unloading arrangements for articles in the shape of discrete sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/50—Auxiliary process performed during handling process
  • B65H2301/51—Modifying a characteristic of handled material
  • B65H2301/517—Drying material

Definitions

• the invention relates to a device for the thermal drying of material webs, sheets or the like. as described in the preamble of protection claim 1.
• Known dryers which are used in modern printing machines to accelerate the drying of printing inks or varnishes, work, for example, with infrared heat radiators, to which radiation reflectors and opposite sheet guide plates are assigned. Since such IR dryers work with IR radiators that have an operating temperature of about 900 C on a glass surface on the radiator, it is necessary to cool the dryer with an appropriate coolant, for example water with antifreeze. The heat absorbed in the dryer area is extracted in a suitable heat exchanger. Electrical supply and control devices or control cabinets and suitable cooling devices for the coolant are required for the cooling device and the IR dryer, which are placed next to or away from the machine. A relatively space-consuming arrangement of the control cabinets and cooling devices next to the machine is often not possible in the pressroom, so that arrangements that do not require long supply and coolant lines must then be used.
• the invention is based on the object of providing a further generic device for thermal drying, which in particular enables space-saving installation.
• the heat exchanger of the cooling device for the dryer device is therefore arranged according to the invention in the air intake area of the air suction device, with which air and residual heat are removed from the dryer area.
• the coolant can be adequately cooled, even though the air extracted from the dryer area is warmed compared to the ambient air.
• the inventive arrangement of the heat exchanger with the air extraction device required on the printing press not only enables a particularly compact arrangement to be achieved, but at the same time a separate cooling fan or the like can be used. save for the cooling device.
• a particularly preferred development of the invention is specified in claim 4. Due to the common arrangement of the air suction device and the operating and monitoring means of the cooling device in a separate housing, the additional housing, the functional groups required for cooling the dryer device can be arranged in a modular manner. This ensures that the individual functional components can be pre-assembled in the factory and checked for proper function with regard to quality assurance, so that only the dryer device and the supply module, that is to say the additional housing with the air suction and Cooling device must be assembled and connected. As a result, customer-friendly, quick assembly can be achieved on site due to the short assembly times of the assemblies. In order to further improve the functional safety of the device according to the invention, the development according to claim 6 is provided.
• an expansion tank is arranged in the coolant circuit according to claim 7, which is also arranged in the additional housing and thus complements the functions accommodated in the supply module.
• the space in the additional housing can be used to accommodate additional supply devices, since the air duct in the air extraction device is independent of the design of the additional housing.
• This also enables the additional housing to be easily adapted to the machine housing, with the design of the additional housing also being able to be adapted to the aesthetic design of the machine housing beyond technical aspects, without having to accept technical disadvantages.
• Claims 13 to 14 describe further expedient developments of the invention.
• an electrical supply unit can also be accommodated in the additional housing, which has electrical and / or electronic supply and control devices for the device according to the invention.
• the shielding of the electrical supply unit from the warm air carrying solvent vapors is particularly important.
• the operating elements for the device according to the invention are expediently arranged on the additional housing.
• control-capable printing machines that is to say printing machines which can be operated remotely from a remotely located control panel
• the individual operating and display elements of the device can also be arranged on the control panel of the control center. In this case, only relatively simple control lines are required.
• Figure 1 is a schematic section through a device for thermal drying, which is arranged on a printing press.
• FIG. 2 shows a schematic section through a supply module of the device according to FIG. 1;
• Fig. 3 is a plan view of the supply module of the device of FIG. 1 without a cover plate.
• FIG. 1 shows purely schematically a delivery arm 10 of a sheet offset printing machine, on which the individual printed sheets are laid out on a stack 11. The printed sheets are guided by a corresponding transport device along a transport path 12.
• the transport path 12 is assigned a dryer device 13, which is designed, for example, as an IR radiation dryer and has a radiation reflector 14, which applies the infrared radiation generated by IR radiators (not shown in FIG. 1) to the along the transport path 12 the drying device 13 reflects past sheets.
• a sheet guide plate 15 is arranged as guide means for the printed sheets.
• a cooling device with a heat exchanger 16, a flow monitor 17, an expansion tank 18 for a coolant and a circulation pump 19 is provided.
• a coolant line 20 leads from the circulation pump 19 to the sheet guide plate 15, through which the coolant flows.
• the coolant outlet of the sheet guide plate 15 is connected to the radiation reflector 14 via a connecting line 21, so that the coolant can also flow through it.
• the coolant outlet side of the radiation reflector 14 is connected via a return line 22 to the coolant inlet of the heat exchanger 16, the outlet of which is connected via the flow monitor 17 to the expansion tank 18 to which the circulation pump 19 is connected.
• an air suction device 23 is provided, which has a pipe fan 25 arranged in an exhaust port 24.
• the exhaust port 24 is arranged on a connection housing 26, in the air inlet area 36, which extends across the transport path 12 for the printed sheets, the heat exchanger 16 of the cooling device is arranged.
• the cooling device is assigned two thermostats, not shown, which monitor the coolant temperature.
• the one thermostat controls the wake of the pipe fan 25 in order to avoid heat build-up after the dryer has been switched off.
• the other thermostat switches off the dryer 13 when the coolant has absorbed a maximum amount of heat corresponding to its heat capacity.
• the dryer device 13 is also assigned an air knife, the blowing nozzles 27 of which extend across the width of the transport path 12 and which are arranged in the transport direction in front of and behind the radiation reflector 14.
• a dusting device 28 with dusting nozzles 29 and ionizing bars 30 can also be arranged behind the dryer device 13.
• the cooling device 23 with its heat exchanger 16, the flow monitor 17, the expansion tank 18 and the circulating pump 19 together with the air suction device 23 and a blower arrangement 31 for supplying the Air knife blowing nozzles 27 arranged in an additional housing 32, which is attached to the machine housing 33 in the area of the delivery arm 10 of the offset printing press.
• the connector housing 26 of the air suction is formed cuboid-shaped and has in its Bo ⁇ denwand 34 is a across the width of the transport path 12 er ⁇ stretching, substantially rectangular opening 35 which respondiert kor ⁇ with a corresponding ⁇ opening in the machine housing 33 and defines an air intake area 36.
• connection housing 26 On the top wall 37 of the connection housing 26, the exhaust port 24 with the tube blower 25 is arranged approximately in the middle.
• the essentially rectangular cross section of the air intake area 36 is adapted to the relatively small, round cross section of the pipe blower 25 or of the exhaust air connector 24.
• the blower arrangement 31 for supplying the air doctor blower nozzles 27 has a blower 38 which is connected via a hose line 39 to an air quantity adjusting device 40 which has an actuating element 40 'which is arranged on an outer wall of the additional housing 32 and is accessible from the outside is not.
• a connecting element 41 is provided, which can be connected to the blowing nozzles 27 in a manner not shown in more detail by means of corresponding lines.
• a heating register (not shown) can be installed in the additional housing in terms of flow in front of or behind the fan 38.
• An electrical supply unit 42 is also arranged in the additional housing 32, the housing 42 'of which is fastened to an intermediate or stiffening wall 44 of the additional housing 32 via corresponding connecting elements 43.
• the intermediate or stiffening wall 44 also serves for the thermal separation of the electrical supply unit 42 from the other units arranged in the additional housing 32.
• the electrical see supply unit 42 which in a manner not shown contains a main switch, a motor protection switch and all the necessary back-up fuses and the electronic control circuits, has a connection device 45 for supply and control lines and an operating unit 46 with corresponding actuating and display elements which are on the outside a side wall 32 'of the additional housing 32 is arranged.
• a supply module for the dryer device is thus created, which can be preassembled in the factory and checked for all functions.
• the device according to the invention for thermal drying is carried out as follows:
• the air suction device 23, the cooling device with heat exchanger 16, flow monitor 17, expansion tank 18 and circulation pump 19 and the blower arrangement 31 for the blowing nozzles 27 of the air doctor blade are completely preassembled in the additional housing 32 in the factory.
• the electrical supply unit 42 is also completely electrically wired in the factory.
• the connections for the cooling medium and air are preinstalled ready for installation and checked for their perfect function and tightness.
• the sheet guide plate 15, the radiation reflector 14 with the IR emitters and possibly the blowing nozzles 27 for the air doctor blade are to be mounted on the printing press.
• the coolant, connection and return lines 20, 21, 22 to be laid.
• the supply module with the additional housing 32 is then mounted on the machine housing 33, the coolant line 20 being connected to a connecting element 45 is, which is attached to an outlet line 46 of the circulation pump 19.
• the return line 22 for coolant is connected to a connecting piece 47 on the heat exchanger 16. If available, the blowing nozzles 27 of the air doctor blade are connected to the air quantity adjusting device of the blower arrangement 31 via a connecting line (not shown) with the connecting element 41. Furthermore, the electrical connection lines for the IR radiators of the dryer device 13 are to be connected.
• exhaust air connector 24 is connected to a suitable exhaust air line, in which filters can optionally be arranged.
• the cooling device is usually to be filled with coolant.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Microbiology (AREA)
• Drying Of Solid Materials (AREA)
• Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=6885244

Family Applications (1)

Country Status (6)

Families Citing this family (14)

Family Cites Families (12)

• 1992
  • 1992-10-26 DE DE9214459U patent/DE9214459U1/de not_active Expired - Lifetime
• 1993
  • 1993-10-09 JP JP6510606A patent/JP2823694B2/ja not_active Expired - Lifetime
  • 1993-10-09 WO PCT/EP1993/002765 patent/WO1994009987A1/fr active IP Right Grant
  • 1993-10-09 DE DE59301909T patent/DE59301909D1/de not_active Expired - Fee Related
  • 1993-10-09 EP EP93922537A patent/EP0650411B1/fr not_active Expired - Lifetime
  • 1993-10-09 AT AT93922537T patent/ATE135292T1/de not_active IP Right Cessation
• 1995
  • 1995-01-03 US US08/362,463 patent/US5546679A/en not_active Expired - Fee Related

Non-Patent Citations (1)

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