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Device for producing a gas cushion

An air cushion and gas technology, applied in glass forming, glass remolding, manufacturing tools, etc., can solve problems such as damage to the optical properties of glass plates, and achieve the effect of eliminating cooling shadows

Active Publication Date: 2008-05-07
PILKINGTON AUTOMOTIVE DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If rollers are also used here, the unavoidable residence time leads to the formation of marks that significantly impair the optical properties of the glass sheet

Method used

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  • Device for producing a gas cushion
  • Device for producing a gas cushion
  • Device for producing a gas cushion

Examples

Experimental program
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Effect test

Embodiment Construction

[0032] The plant according to FIGS. 1 and 2 has a preheating furnace 1 for preheating the glass panes 2 of a pair of glass panes. The glass sheet 2 is advanced through the furnace on rollers 3 whose spacing is reduced in the region of the furnace exit, since the heated glass sheet is deformable and thus requires stronger support. Behind the preheating furnace 1 there is a bending station 4 equipped with an annular glass bending mold 5 and a full-surface contact vacuum mold 6 conforming in contour and profile to the desired shape of the glass sheet after bending .

[0033] The invention relates in particular to a gas chamber 7 for generating a gas cushion, illustrated in FIG. 1 . The chamber 7 has an upper wall 10, as in image 3 and 4As shown in a partial plan view and surrounded by an annular die 5 . The upper wall, broadly speaking, can also conform in profile and section to the desired shape of the glass sheet to be produced, allowing for the fact that, as mentioned befo...

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Abstract

The gas cushion serves to support a preheated glass sheet and is produced by a chamber, which is connected to a source (21) of compressed gas. The upper wall (10) of the chamber is adapted to the shape of the glass sheet and has a plurality of apertures for the passage of gas in the form of nozzles (14), which comprise an entry bore (22) and, following thereupon, a progressively widening exit hole (16) with a nozzle exit area (15). The upper wall (10) of the chamber has a greater degree of perforation (sum of the nozzle exit areas (15) in relation to the total area of the respective zone) in its edge zone (12, 13) than in its central zone (11). The nozzles ensure that no jet marks can arise. The gas of the gas cushion can also flow out undisturbed at the side, so that no cooling edges are present and the occurrence of cooling shadows is accordingly avoided.

Description

technical field [0001] The invention relates to a device for generating a gas cushion for supporting a preheated glass sheet, the device comprising a chamber connected to a source of compressed gas, the upper wall of which chamber is adapted in its outer dimensions to the glass plate profile and has multiple apertures for gas passage. Background technique [0002] The device can be used wherever there is a problem of supporting a preheated glass sheet, for example to be toughened. However, the main field of use is the production of curved laminated glass panels, especially for the construction of motor vehicles. Laminated glazing for vehicles generally comprises two layers of glass, where in use one layer forms the inner surface of the glazing (ie it faces the interior of the vehicle) and the other forms the outer or exterior surface of the glazing. [0003] During the manufacture of glazing, a pair of glass sheets is heated to bending temperature in a preheating furnace a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B23/035C03B35/24
CPCC03B23/0352C03B35/24C03B23/0355C03B23/035
Inventor D·丰克J·皮尔茨P·米歇尔斯
Owner PILKINGTON AUTOMOTIVE DEUT GMBH
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