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Method and device for accurately dividing a molten low-viscous glass into small portions

A glass melt, low-viscosity technology, applied in the direction of the feeding machine nozzle, etc., to achieve the effect of avoiding defects, small weight tolerance, and reducing corrosion

Inactive Publication Date: 2008-12-03
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, manufacturing tolerances in the manufacture of the platinum or precious metal elements of the feeder and the deformation of the needle and needle seat at higher temperatures also limit the possibilities of such a feeder, so that in general it is not possible to achieve less than 0.2 grams weight fluctuations

Method used

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  • Method and device for accurately dividing a molten low-viscous glass into small portions
  • Method and device for accurately dividing a molten low-viscous glass into small portions
  • Method and device for accurately dividing a molten low-viscous glass into small portions

Examples

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Embodiment Construction

[0063] Refer to the following figure 1 , which shows a first embodiment of a device 1 for simultaneous multiple portioning of glass fractions from a glass melt. The principle of the device is based on a valve arrangement 100 with a valve for interrupting a glass melt flow and a nozzle 3 with a plurality of outlets 7 connected downstream of the valve for neutralizing a glass melt flow.

[0064] exist figure 1 In the example shown, the valve device 100 is designed in particular as a needle feeder with a feed needle 103 . The device is also equipped with a force-measuring device 102 with which, at least during a part of the positioning of the feed needle 103, in particular its tip relative to the valve seat of the feed needle 103, it is possible to measure in particular a direction in x, y and / or z. The force acting on the feed needle 103.

[0065] The device 1 also has a liquid reservoir 104 arranged in a thermal insulation 112 for the low-viscosity glass melt 20 , which can ...

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Abstract

In order to portion glass melts and to increase the flow rate and transmission of optical melts, the inventive method for accurately portioning low-viscous glasses, whose viscosity is equal to 107.6 dPa.s with a temperature equal to or less than 670 DEG C, in particular glasses used for blank pressing or low-Tg glasses, is based on a continuous melting process consisting in repeatedly supplying the portions, whose weight ranges from 0.2 to 10 grams with a relative and / or absolute weight deviation less than 5 % with respect to the portion average weight, by means of a clocking needle feeder (100) which comprises a nozzle (3) provided with several outlets (7).

Description

technical field [0001] The invention generally relates to the portioning of molten glass, in particular for the blank pressing of optical components. Background technique [0002] Imaging optics are used, for example, for reduction or magnification in objectives of cameras, projection devices, microscopes, telescopes and the like. Higher requirements are always placed on the quality of enlarged or reduced images. Products that are simultaneously used in a large number of markets should always be cheap to manufacture. [0003] Although the quality of the images can often be improved several times again by means of special image processing software, these systems require high storage capacities and additional energy consumption. Therefore, high standards are also set for the image properties of optical models in mass production. To date these standards have been partially ensured only by means of special filters. [0004] Among these conditions are also high profile accura...

Claims

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Application Information

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IPC IPC(8): C03B7/088
CPCC03B7/088
Inventor P·埃布林D·莫泽勒M·舍费尔M·雷戴伊R·博尼茨J·费罗恩德H·容
Owner SCHOTT AG
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