Adhesive bonding and miscellaneous chemical manufacture – Differential fluid etching apparatus – With microwave gas energizing means
Patent
1985-10-01
1987-05-05
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Differential fluid etching apparatus
With microwave gas energizing means
156640, 156901, C23F 102, B44C 122, C03C 1500, C03C 2506
Patent
active
046629769
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for treating objects with a treatment fluid, more especially an etching or developing machine for the production of printed-circuit boards, comprising a nozzle stock which is provided inside a housing and which comprises a plurality of nozzles, which are directed towards a treatment chamber, and a channel system for feeding the treatment fluid to the nozzles.
On known etching and developing machines for the production of printed-circuit boards, the nozzle stock is formed by the feeding channels themselves, which constitute an open supporting frame for the nozzles and are situated entirely inside the treatment chamber. The exchanging and setting of the nozzles is extremely troublesome in this construction since the treatment chamber is filled with etching-medium residues and etching-medium vapours, which are corrosive and evil-smelling.
It is the object of the present invention to design an apparatus of the kind mentioned at the beginning in such a way that the fitting, exchanging and possibly the angular setting of the nozzles is possible easily and without any impairment due to residues and vapours of the treatment fluid.
According to the invention, this problem is solved in that housing of the apparatus; directed away from the treatment chamber and can be passed through a channel in the nozzle stock and project with a neck from the side of the nozzle stock that is directed towards the treatment chamber.
In the plate-like design of the nozzle stock according to the invention, the stock tightly bounds the treatment chamber towards one side. The nozzles can be fitted or exchanged from the "rear", namely the side that is directed away from the treatment chamber, of the nozzle stock. A dismantling of the nozzles is frequently necessary, particularly if it turns out that one of the nozzles is clogged and a search for the respective unsatisfactorily working nozzle has to be carried out.
Expediently, the nozzle is also rotatable inside the nozzle stock from the side that is directed away from the treatment chamber. The rotation of the nozzles, which is particularly important for the setting of fan-shaped or flat spray nozzles, may be effected during the operation of the apparatus.
A particularly appropriate construction of the apparatus is to the effect that the nozzle stock comprises for each nozzle: the treatment chamber to a channel and which has a first diameter; directed towards the treatment chamber and which has a second diameter that is smaller than the first diameter; comprises: first through bore; diameter of the first through bore but is larger than the diameter of the second through bore; through bore; abutting a surface which is located on the side of the channel that is directed away from the treatment chamber and the ring shoulder connecting the second zone to the nozzle neck tightly abutting a surface which is located on the side of the channel that is directed towards the treatment chamber.
It is of advantage if the face of the nozzle that is directed away from the treatment chamber is provided with a mark indicating the rotational position of the nozzle within the nozzle stock. In this way, it is possible at any time to find out at a glance what angular positions the various installed nozzles have. With each mark there may be associated on the nozzle stock a scale so that once an optimum setting of the nozzles has been found it can be recorded in writing and can be reproducibly re-established according thereto.
The mark may simultaneously constitute the means to which the force for rotating the nozzle is applied. This means may be formed, for example, by a screw driver slot.
Expediently, the nozzle is fastened to the nozzle stock by means of a cap nut which is screwed on a collar provided with an external thread and located at the side of the nozzle stock that is directed away from the treatment chamber.
The nozzle stock may be reduced in thickness in the zones outside the channels so that the channel system is embossed on one side and/or the other side of
REFERENCES:
patent: 2895814 (1959-07-01), Clark
patent: 3082774 (1963-03-01), Benton et al.
patent: 3616049 (1971-10-01), Moore et al.
patent: 3630804 (1971-12-01), Coffman et al.
Philpitt Fred
Powell William A.
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