Glass manufacturing – Processes – Glass preform treating
Patent
1997-07-01
1998-12-08
Silverman, Stanley S.
Glass manufacturing
Processes
Glass preform treating
65348, 65349, 65351, C03B 2744
Patent
active
058462813
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is related to a method for adjusting the quench head of glass tempering apparatus.
BACKGROUND OF THE INVENTION
Glass tempering is almost always performed by flows of substance in gaseous phase specially by air jets. For achieving good tempering results and moderate power consumption it is important, that air jets impinging the glass: from a distance of about 20 mm, glass, impinging on the glass, are small and regular, typically 10-15 mm only, and to the main planar surface of the glass and does not deviate from the perpendicular direction more than 20 degrees.
If the above conditions are not met, the quality of the tempering is not satisfactory although the consumption of the energy is quite high.
For flat tempered glass these conditions are not difficult to achieve, as the quench head is then always flat and fixed and nozzle positions do not need any substantial control or adjustment and thus their position remain unchanged continuously during the tempering process. Also, when the blowing distance is changed, the distance of the whole quench area (glass) from the nozzles changes simultaneously and remains at equal distance from the glass in every single point of impinging.
However, the tempering of glass which has been bent to a certain curvature prior to the tempering phase, is very difficult because the above conditions A-C should be met simultaneously when the quench head should follow the shape of glass. Thus the adjustment to meet the variations of the shape of glass will be decisive factor to achieve good tempering results.
In order to meet the above conditions the prior art suggests as a common practice to make special pair of quench heads for each glass type. This is, however, very expensive as each type of glass needs its own pair of quench heads. Also, the change of quench heads normally involves quite laborious effort, because of their weight and the quench heads need to be fixed properly and the connections have to be air tight.
Another way to meet the above requirements suggested by the prior art in the field is, that the quench head is composed of sections, for instance different size of flat and bent sections with different radiuses. When combining them together, the requirements can also be met to some extent. In this way investment savings are obtained, but the efforts needed to change the quench are even further increased.
The publication FI-76313 relates to a quench which is arranged to follow the shape of the bending conveyor and the quench distance measured from the surface of the glass can be kept constant. This system is based on principle of the bending and further the tempering system can only be adapted on such methods in which the bending and the tempering phases take place in one and the same position.
The glass travels during bending and quenching supported on the roller conveyor, rollers being perpendicular to the glass travel direction. The longitudinal directions of the quench blocks are parallel to the rollers, (perpendicular to the glass travelling direction). The nozzle rows are arranged on the quench block on the whole length of the same.
In this way nozzle distances remain constant all the way from one side of the glass to the other side in perpendicular direction of the glass travelling direction.
In the direction of the glass travel the distance of the nozzle rows between the quench blocks with bending changes, but it is not so harmful because the glass is moving in this direction. Therefore the position of the impingement of the air on to the glass changes continuously and even tempering is achieved.
This kind of system is naturally suitable only for glass bent to cylindrical configuration travelling on the rollers, between the upper and lower quench heads.
Various efforts have been made to develop bending and tempering systems, in which bending and tempering takes place in one and the same place. The quench head must follow the shape of the glass also in these systems.
Typical examples are presented in publications FI-89902
REFERENCES:
patent: 4071346 (1978-01-01), Schmidt
patent: 4157910 (1979-06-01), Imler
patent: 4343645 (1982-08-01), Abe
patent: 4619683 (1986-10-01), Halbertschmidt et al.
patent: 4711655 (1987-12-01), Schultz
patent: 4749401 (1988-06-01), Colmon et al.
patent: 4883527 (1989-11-01), McMaster et al.
Jarvinen Jouko
Nikander Risto
Silverman Stanley S.
Vincent Sean
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