DEST008485MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: July 21, 1954. Advertised on: September 8, 1955

GERMAN PATENT OFFICE

Silver mirrors in higher quality are subjected to copper plating on the back, about destructive influences of a mechanical and chemical nature on the sensitive silver layer to hold back with good success. A lacquer layer is then applied to the copper layer in the usual way applied.

The copper plating plant in the manufacture of mirrors is usually very extensive and takes up considerable space. It requires well-trained operators, with great care Care must be taken to ensure compliance with various bath and numerous operating conditions. Very big. Attention is the right contact between the silver coating and the power supply to turn to. Here, too, many arrangements have already become known that relate in particular to this refer to treating the mirror to be copper-plated · hanging vertically in the electrolyte bath by the mirrors are placed in precisely dimensioned frames. Poses a particular difficulty always the treatment of the very weak and therefore very sensitive silver coating. The manufacturing costs such mirrors are with these indicated. Difficulties correspondingly high, In other devices, the mirrors are copper-plated in a horizontal position. In particular Certain pincer designs became known here, which make good contact with the silver layer to ensure. The economic production costs could not be here either be further reduced.

509 551/125

Claims (5)

St 8485 VI a / 48 a Nacli (U-H in accordance with the suggestions made in accordance with the invention however, a number of technical and economic factors are achieved. The ones to be copper-plated Mirrors are initially on both sides and the edge surfaces in between provided with a silver coating in the known way of working. The mirrors prepared in this way are then placed in (Inserted into the electrolytic bath and, in a horizontal position, the silver surface opposite the also horizontal copper electrode strand a copper layer of the appropriate thickness. The mirrors slowly rest on you forward moving endless conveyor belt, which is either conductive itself or on its after the outside facing side is provided with a suitable metallic lielag, which is in electrical con is in sync with the power supply, for example, the conveyor belt can consist of (! unnnituch with I. single wall insert. There's one on the outside Lead or copper foil fixed or movable connected to the (iiuumituch. Instead of metal foils Openwork ribbons or mesh can be used to reduce the weight linden. These metal foils or metal screens are on the one hand above a sliding contact secure front connection with the negative pole of the direct current system, on the other hand with the base of the mirror to be copper-plated over the edges with the upper side of the mirror in electrical contact. The power supply can also be via a large number of metal rods that are conductively connected to one another take place, which are constructed in the manner of a roller blind. Audi this. Arrangement is so too meet that a 1 horizontal movement of the surface is possible. If copper, brass or lead is used as a conveyor belt, the power supply can also be via the support rollers or Drive rollers take place. The Klcktrolvtbad can be acidic, neutral, cyanidic or set in any other known manner. Current and voltage move within common and known values. After the mirrors have passed through the load in a horizontal position, they become, for example Slid outwards via an inclined carriage. As recognizable on the underside of the If no copper plating could take place, the silver coating can be removed after the end of the treatment easily remove. The copper coating achieved on one side is characterized by a special one Uniformity, because the electric field between the two electrodes is largely homogeneous is due to the parallel spacing of the electrodes from each other. Kiiie to carry out the just indicated A device suitable for the coppering process is shown in an exemplary embodiment in the figure shown. The appropriately elongated bath container ι is made of wood, which for good sealing in Tongue and groove is worked. Fr is provided with an asphalt surface on the inside or with Lead, copper or brass sheets knocked out. The Badspiegcl, i.e. the height of the bath, is denoted by 2. The container is inclined forward to allow any sludge that may develop to remove a drain cock, not shown. The container 1 rests on feet 3, which at the same time act isolating. The copper electrodes 4 are held by the holders 5 approximately horizontally below the bath level 2. The power is supplied via the lead 6. The other electrode consists of, for example an endless rubber blanket 7, which has a metallic conductive surface, which consists of a Foil, sieve or metal strips consists. This cloth is supported with the help of the rollers 8. The Tension roller 9 ensures that the cloth is tensioned evenly. The details of the tape guide are within the usual measures and have not found any further representation. the Power is supplied to this electrode via 10. An inclined slide or entry 11 and a correspondingly designed outlet 12 allow the use and discharge of the Mirror. The conveyor belt is driven by the motor 13, which is driven by a strongly reducing gear the shaft 15 drives. It is noteworthy in this connection that the treatment time of the Mirrors lasts a time that cannot be shortened if the quality of the copper plating does not suffer target. The conveyor belt can only handle the mirror material used at a fairly low speed move on. This results in the need for a strong reduction. With the device described it is almost inevitable that all to be treated Mirror surfaces ensure safe contact with the power supply due to their own weight the mirror glass and the flat nature of the base (conveyor belt). The copper plating can be independent of the size of the different external dimensions, shapes, Execute any existing facets technically flawlessly and economically cheap. Γα τ f. Ν τ a N s ρ η 0 c. π ν.-. ι. Process for copper-plating silver mirrors, characterized in that the Mirror glass is silver-plated on both sides and on the edges, whereupon the copper plating in horizontal Position with power supply via a metallically conductive, horizontally movable Base and a copper electrode arranged parallel to it under production of a homogeneous field. 2. The method according to claim 1, characterized in that in acidic, cyankalischcr, preferably the copper plating is carried out in a neutral bath solution. 3. Device for performing the method according to claim 1 and 2, characterized in that that in an elongated shape 551/125 St 8485 VIa / 48a Bath tank an externally driven, slowly moving conveyor belt with metallic conductive, outward-facing surface by a large number of support rollers opposite the Copper electrode is held in a horizontal position and with power supply via sliding contacts is equipped. 4. Apparatus according to claim 3, characterized in that the conveyor belt with a metallically conductive, often interrupted metal foil, a metal wire mesh or a plurality of transversely extending bars is equipped. 5. Apparatus according to claim 3, characterized in that the conveyor belt consists of metallic strips is constructed. For this purpose ι sheet of drawings © 509 551/125 9.55