DE2039206A1 - Film dryer - Google Patents

Description

AGi ¹ A-GBVAEET AKTIENGESELLSCHAFT August 5, 1970

Leverkusen 10-bg-dh

PG 55O / MG 809

Film dryer

Me invention relates to a film dryer, in which by means of a cooperating with a heating device Blower heated air over the conveyed by means of transport rollers, preferably in a vertical direction through the dryer film is blown, with part of the exhaust air emerging from the Trookner interior again as circulating air is fed back into the fan and a contact remote thermometer located in the air flow to control the heating device is provided.

With this mixture, depending on the condition, quantity and format of the film to be dried, the damp and warm layers are different Circulating air with the supply air, which is cold and dry depending on the respective ambient temperature, is considerable Temperature fluctuations, which by means of the contact remote thermometer present discontinuous regulation can not be compensated in a satisfactory manner.

109887/0979

PG 55O / MG 809

According to the invention, the heating device is now divided into three groups of radiators, one of which is a constant Basic heating is on one operating switch of the device, a second as variable basic heating by means of an external one The adjuster can be gradually switched on via a phase control and another as a control heater of the Contact remote thermometer is controlled.

With this arrangement, the discontinuously operating remote contact thermometer only has a comparatively small one To control temperature share, while that of the respective ambient temperature, as well as of the type and amount of processed Film material-dependent basic heating line in a stepless manner with the help of the phase control is adjustable, which in turn, in order to keep the control losses and the outlay on equipment small, only the minimum controls the heating output that is to be applied by the constant basic heating. With The drying temperature can also be used for different Film formats can be kept constant within narrow limits at any room temperature.

A particularly homogeneous surface of the dried film can be achieved if, furthermore, according to a further feature

109 ^ 87/0979

_ 3 -

PG 550 / MG 809

times the invention across the width of the film to be dried several fans, each with three-stage adjustable heating and their own supply and exhaust air ducts are arranged.

In the drawing is an embodiment of the invention for example shown. It shows

1 shows a section through the device according to the invention along the line I-I in FIG. 2, and

FIG. 2 shows a section through the device along the line H-II in FIG. 1.

According to the figures, 1 transport roller pairs are in a Trookner housing 2 arranged, which, for example, coming from an outfeed roller pair 3 of a developing device Guide 4 in the direction of arrow A through the dryer housing 1. The film leads downwards essentially vertically directed movement, while the air supplied by two fans 5 and 6 in arrow direction B vertically upwards increases. The air is therefore fed in countercurrent and almost parallel to the film. This turns out to be a very intense one Drying achieved with a relatively low heating power. On the other hand, it prevents the drying air in the dull Angle hits the gelatin layer of the film, which is still soft after the development process, and leaves traces of drying there, which are particularly evident during the evaluation

109887/0979

PG 55O / MG 809

of an X-ray film could make them very annoying. A special uniformity of the dried surface is also achieved by the fact that over the width of the Film several blowers with possibly. Independently finely adjustable heating devices are arranged.

Part of the air rising upwards is in the direction of the arrow C and D routed into exhaust air ducts 1a to 1o and through exhaust air nozzles 7 and 8 led to the outside. Another part of the air is supplied in the direction of the arrow E to the air ducts 1d and 1e ι from where they get back into the suction openings of the fans 5 and 6.

The drying air is heated by means of a heating unit 9 which is assigned to each of the fans 5 and 6 and which each contains three groups of heating elements 10 to 12. The heating element 12 is connected to mains conductors 16 and 17 via lines 13 and 14 with the interposition of a remote contact thermometer 15, an operating switch 18 being inserted into the mains conductor 17. The radiator. 11 lies directly on the mains conductors 16 and 17 via lines 19 and 20. The heating element 10 is connected to the mains conductor 16 by means of a conductor 21 and to the mains conductor 17 by means of conductors 22 and 23. Between the conductors 22 and 23 lies. a phase control 24, which can be continuously regulated by means of a potentiometer 25.

109887/0979

-5-

PG 550 / day 809

Now there is an operating switch 18, which nods in more detail Way also the transport engine, as well as the engines of the two fans 5 and 6 of the dryer is activated, switched on, so that the basic heating element is on each pail 12 started. This basic heating element 12 provides the minimum in all operating states and ambient temperatures that occur required heating requirement. Depending on the type and amount of film running through the dryer and in Depending on the prevailing room temperature, this basic heating output can now be achieved by appropriate Adjustment of the potentiometer 25 of the phase angle control 24 of the heater 11 continuously changed and be adapted to the given circumstances. The remote contact thermometer 15 controlled radiator 10 must therefore only the during of the ongoing device operation occurring at short notice Compensate for temperature fluctuations.

109887/0979

Claims (5)

AGFA-GEYAERT AKTIENGESELISGHAi ¹ T August 5, 1970 Leverkusen 10-bg-dh. PG 550 / MG 809 Claims Film dryer, in which heated by means of a fan cooperating with a heating device Air over the through the dryer preferably in a vertical direction by means of transport rollers Film is blown using a rope coming out of the dryer interior Exiting exhaust air is fed back into the fan as circulating air, and a lying in the luftsti'om Contact remote thermometer cur control of the heating device is provided, characterized »that the heating device (9) is divided into three groups of radiators (10 to 12), of which one (11) is used as constant basic heating on an operating switch (17) of the device lies, eiiio second (10) ala variable Basic heating by means of an external adjuster (25) via a phase control (24) gradually can be maintained and another (12) is controlled as a control heater by the remote contact thermometer (15). 10 9 8 8 7/0979 -7- - 7 PG 550 / MG 809 * 2) film dryer according to claim. 1, daduroh. marked, that over the width of the film to be dried (4) several fans (5 »6) each with three-stage adjustable heating and separate supply and exhaust air ducts are. 1 sheet of drawings 109887/0979 Blank page