DD221478A1 - DEVICE FOR REDUCING EXTRACTION LOSSES IN THE GALVANIZATION OF STRIP-LIKE PARTS - Google Patents

Abstract

The invention relates to a device for reducing the leaching losses when galvanizing strip-like parts, in particular stripters strip in microelectronics. The object and the object of the invention is a simple way to reduce the leaching losses and thus reducing the cost of monitoring the electrolyte components and the precious metal recovery. According to the invention, this is achieved by attaching to the plating frame two electrical contacts associated with each strip whose connecting line makes an angle of 10 to 30 to the horizontal, and moreover assigning to each strip a drain hook which is in loose connection with the lowest point of the strip forms.

Description

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Device for reducing the leaching losses during galvanization of strip-like parts

Field of application of the invention

The invention relates to a device for reducing the leaching losses when galvanizing strip-like parts, in particular carrier strips in microelectronics.

Characteristic of the known technical solutions

Depending on the shape of the parts to be electroplated, they are generally attached horizontally or vertically to the galvanizing, regardless of whether they hang dormant in a board or continuously drawn as a band through the electrolytes. In particular, in the most widespread horizontal arrangement can not expire after lifting the strips of the electrolyte of this and is dragged into the rinsing baths. This leads to high losses of metal ions and a constant monitoring of the electrolyte to its composition is necessary. In order to reduce the lugging losses, DE-OS

27 25 096 a heated scraper used. DE-OS

28 06 470 indicates a solution in which the strips pass through a scraper board after removal of the zinc bath. In these solutions is disadvantageous that this scraper board requires an additional operation and the

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Risk of scratching the surface of the strip is given.

Object of the invention

The object of the invention is a device for reducing the lugging losses in the plating of strip-like parts, in which the working time is reduced and thus a higher productivity is achieved.

Explanation of the essence of the invention

The invention has for its object to provide a device for reducing the leaching losses during the plating of strip-like parts, in which no additional operation to reduce the leaching losses of metal ions is necessary and the cost of precious metal recovery and the constant monitoring of the electrolyte can be reduced to a minimum ,

According to the invention, the object is achieved in that each strip is associated with two electrical contacts, the connecting line forms an angle of 10 ° to 30 ° with the horizontal, so that the strips occupy an inclined position. In addition, a drain hook made of a soft elastic, non-absorbent material is assigned to each strip so that the lowest point of the strip has a loose connection with the drain hook. Advantageously, the respective paired electrical contacts and the associated drain hooks are arranged vertically offset · When lifting the strips from the electrolyte, the strip assumes an inclined position, thus clearly creates a lowest point as a drip point at which the liquid converges, the loose connection with the drain hook this effect reinforced. Due to the soft

elastic material of the drain hook are compensated dimensional tolerances of the strip.

embodiment

The invention will be explained in more detail using an exemplary embodiment.

Attached in pairs to a galvanizing frame are hook-shaped electrical contacts whose connecting line form an angle of 10 ° to 30 ° with the horizontal. Thus, the strips occupy slopes during excavation, the liquid runs to a lowest dripping point. It is advantageous if the strips are arranged vertically offset, in order to avoid dripping onto the underlying parts. The leaching losses are also significantly reduced if the liquid film does not drip off, but expires. For this purpose, additional drain hooks are attached to the galvanizing frame in such a way that the lower drainage point of the strip is loosely connected to the frame.

With such racks, the leaching losses compared to a horizontal arrangement can be reduced by 90 to 95 % .

A similar effect can be achieved if the galvanizing racks are briefly rotated in such an inclined position during extension from the electrolyte of the machine.

Claims (2)

Br indunga claim. 1. A device for reducing the leaching losses during the galvanization of strip-like parts with rows of electrical contacts on Galvanisiergestell for receiving the strip, characterized in that each strip spaced two electrical contacts are assigned, the Verhindungalinie forms an angle of 10 ° to 30 ° to the horizontal , and in that each strip is associated with a drain hook made of a soft elastic, non-absorbent material so that the lowest point of the strip has a loose connection with the drain hook. 2. Device according to item 1, characterized in that the respective paired electrical contacts and the associated drain hooks are advantageously arranged vertically offset.