EP0006799A1 - Verfahren und Vorrichtung zur Erhöhung der Entwicklungsgeschwindigkeit in Diazokopiegeräten - Google Patents

Verfahren und Vorrichtung zur Erhöhung der Entwicklungsgeschwindigkeit in Diazokopiegeräten Download PDF

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Publication number
EP0006799A1
EP0006799A1 EP79400397A EP79400397A EP0006799A1 EP 0006799 A1 EP0006799 A1 EP 0006799A1 EP 79400397 A EP79400397 A EP 79400397A EP 79400397 A EP79400397 A EP 79400397A EP 0006799 A1 EP0006799 A1 EP 0006799A1
Authority
EP
European Patent Office
Prior art keywords
vapors
copy
walls
ammonia vapors
ammonia
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.)
Granted
Application number
EP79400397A
Other languages
English (en)
French (fr)
Other versions
EP0006799B1 (de
Inventor
Claude Michel
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.)
Rhone Poulenc Systemes SA
Cellophane SA France
Original Assignee
Rhone Poulenc Systemes SA
Cellophane SA France
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 Rhone Poulenc Systemes SA, Cellophane SA France filed Critical Rhone Poulenc Systemes SA
Priority to AT79400397T priority Critical patent/ATE368T1/de
Publication of EP0006799A1 publication Critical patent/EP0006799A1/de
Application granted granted Critical
Publication of EP0006799B1 publication Critical patent/EP0006799B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D7/00—Gas processing apparatus

Definitions

  • the present invention relates to an improvement to the process for developing diazocopies using ammonia vapors or the like. It relates more particularly to a process for developing a copy medium coated with a sensitive diazo layer previously exposed through an original in an ultraviolet exposure station, consisting in bringing said copy medium into contact with ammonia vapors, at a temperature greater than or equal to 55 ° C.
  • a process for developing diazocopies has been known for a long time under the name of "dry" development process.
  • the method according to the invention makes it possible to avoid these disadvantages.
  • the method according to the invention is characterized in that the ammoniacal vapors are channeled and accelerated vertically by aerodynamic effect in a convergent pipe, said vapors then being directed towards the copy medium. Arranged so that the flow of ammonia vapors has a trajectory between the horizontal and the vertical and strikes the copy medium, on the side of its sensitive layer, with a speed sufficient to cause rapid development of said copy medium.
  • the invention uses the "chimney effect" which produces a natural acceleration of the vapors which are concentrated in a converging pipe: the vapors being hot, they undergo a natural acceleration allowing them to strike the copy medium and to penetrate into it ci, thus accelerating the speed of development of the sensitive layer.
  • an angle of incidence of said vapors on said medium will be chosen less than 45 ° and preferably at 30 °, in order also to obtain turbulence in the ammoniacal vapors close to the copy.
  • the invention also relates to a device for implementing such a method, said device comprising a development chamber in which ammonia vapors are generated by means known per se, and a rotary cylinder bringing the sensitive layer of the copy into contact with said ammonia vapors, the device being characterized in that said development chamber comprises a convergent system for accelerate the ammonia vapors and concentrate them on the sensitive layer of the copy, said convergent system comprising no means of external energy supply.
  • convergent system is meant a set of planes assembled together and having an upper opening and a lower opening, at least one dimension being identical for each of said planes and of which a section in a vertical plane perpendicular to the copy medium has an opening upper, of dimension smaller than that of the lower opening.
  • a convergent system consisting of two converging walls substantially parallel to the rotary cylinder, extending over the entire width of the developing chamber, the lower ends of each of said walls being arranged on either side of the cup. so as to channel the vapors released, while the upper ends of said walls are located near the rotary cylinder, the distance separating the bases of the walls being greater than the distance separating the top of said walls.
  • the walls which may consist of successive planes inclined with respect to each other, have no acute angle capable of reflecting part of said vapor.
  • the development device comprises lateral cheeks 2I forming supports between which is the development chamber I, the bottom of which forms a horizontal cup 9 next to which the heating resistor 3 is fixed.
  • the cylinder 6 which is a metal tube, for example , has along its axis a heating resistor 4. It is provided with a coating 5 which is in contact with the perforated wall I7 fixed at I8 and I9 by means of any known type.
  • the development chamber I is ensured by the lip seals 8 and I5.
  • the upper part I2 of the development chamber I comprises an opening 27 provided with a flange around which is fixed evacuation conduits.
  • the photosensitive material 42 to be developed is introduced into the development device using a set of parallel straps 35 driven by the rollers 33 and 34, said straps having a width of approximately 5 cm.
  • These straps are spaced from each other by a few millimeters so that can take place therebetween, teeth 29 having a semi-circular end, fixed between them by a support 30 so as to form a comb.
  • the flat part of these teeth 29 is located under the upper guide I6 for introducing the photosensitive material 42, the semi-circular part of these teeth allowing the photosensitive material to be turned over before its introduction into the development chamber.
  • the cylinder 6 has a toothed tip at each of its ends. Each of them is carried by three rollers 22, 23 and 24.
  • the cylinder 6 is driven by the pinion 32 directly connected to the axis of a motor, not shown in the figure.
  • the thermostat 38 connected in series with the resistor 4 is placed near the inner wall of the double cylinder 6.
  • Thermostat 37 is connected in series - with heating resistors 2 and 3 placed respectively near the exit from the developing chamber I and near the horizontal cup 9 and the introduction guide I6. As shown in the figure, the thermostat 37 is placed near the resistor 3 and the horizontal cup 9. In order to favor the regulation of the temperature of the developing chamber I, the latter is surrounded by a material 20 to strong thermal insulation power.
  • This material can be glass wool, polyurethane foam, expanded polystyrene, etc. Its thickness will be a few centimeters, variable depending on the material used.
  • the ascending system consists of a set of "rear” walls 5I, 52 and 53 arranged parallel to the axis of rotation of the cylinder 6, and a set of “front” walls 54, 55, 56 and 57 arranged also parallel to cylinder 6.
  • the walls are interconnected by spacers such as 58 (three spacers are sufficient for a developer width of 1.25 m and aluminum walls).
  • the walls are convergent, that is to say that the walls 53 and 54, near the cylinder are closer than the walls 5I and 57 situated above the horizontal cup 9. It has been found that there is no was not necessary to have a tightness of this converging system.
  • the wall 57 is located a few distances (approximately I cm to facilitate manufacture) from the joint I5. Due to the suction of the ammonia vapors by a "chimney effect", it can be seen that very few vapors are directed towards the copy support between the wall 57 and the seal I5.
  • the angles between the walls 5I, 52 and 53 are optus angles, as well as those between the walls 54, 55, 56 and 57. The improvement in the speed of development can be demonstrated by experience following comparison:
  • the maximum speed of development of a machine is the speed at which a non-insulated diazo paper can be developed, over a determined length, without seeing poorly developed areas appear.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Manufacturing Of Printed Circuit Boards (AREA)
  • Electrotherapy Devices (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP79400397A 1978-06-23 1979-06-18 Verfahren und Vorrichtung zur Erhöhung der Entwicklungsgeschwindigkeit in Diazokopiegeräten Expired EP0006799B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79400397T ATE368T1 (de) 1978-06-23 1979-06-18 Verfahren und vorrichtung zur erhoehung der entwicklungsgeschwindigkeit in diazokopiegeraeten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7818787A FR2429453A1 (fr) 1978-06-23 1978-06-23 Procede pour ameliorer la vitesse de developpement dans les machines de diazocopie et dispositif de mise en oeuvre dudit procede
FR7818787 1978-06-23

Publications (2)

Publication Number Publication Date
EP0006799A1 true EP0006799A1 (de) 1980-01-09
EP0006799B1 EP0006799B1 (de) 1981-11-04

Family

ID=9209889

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400397A Expired EP0006799B1 (de) 1978-06-23 1979-06-18 Verfahren und Vorrichtung zur Erhöhung der Entwicklungsgeschwindigkeit in Diazokopiegeräten

Country Status (7)

Country Link
US (1) US4289394A (de)
EP (1) EP0006799B1 (de)
AT (1) ATE368T1 (de)
BR (1) BR7903908A (de)
DE (1) DE2961228D1 (de)
FR (1) FR2429453A1 (de)
MX (1) MX148057A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6252653B1 (en) 1999-10-12 2001-06-26 Burgess Industries Inc. Rotary thermal desensitizer of developer for photosensitive copy sheet material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB762632A (en) * 1954-07-28 1956-11-28 Mason & Sons Ltd E N Improvements in or relating to apparatus for photographic development by means of agas
FR1315673A (fr) * 1962-02-23 1963-01-18 Appareil pour le développement en continu au gaz ammoniac de papiers photosensibles
FR2358686A1 (fr) * 1976-07-13 1978-02-10 Cellophane Sa Procede de developpement a sec d'un materiau de diazotypie et dispositif de mise en oeuvre

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6501481A (de) * 1964-02-15 1965-08-16
US3534673A (en) * 1967-08-29 1970-10-20 Gaf Corp Photocopy developing apparatus
GB1256540A (de) * 1967-12-28 1971-12-08
NL7400786A (de) * 1973-02-19 1974-08-21

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB762632A (en) * 1954-07-28 1956-11-28 Mason & Sons Ltd E N Improvements in or relating to apparatus for photographic development by means of agas
FR1315673A (fr) * 1962-02-23 1963-01-18 Appareil pour le développement en continu au gaz ammoniac de papiers photosensibles
FR2358686A1 (fr) * 1976-07-13 1978-02-10 Cellophane Sa Procede de developpement a sec d'un materiau de diazotypie et dispositif de mise en oeuvre

Also Published As

Publication number Publication date
FR2429453B1 (de) 1981-11-13
US4289394A (en) 1981-09-15
MX148057A (es) 1983-03-09
EP0006799B1 (de) 1981-11-04
FR2429453A1 (fr) 1980-01-18
DE2961228D1 (en) 1982-01-14
BR7903908A (pt) 1980-02-20
ATE368T1 (de) 1981-11-15

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