Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1987-08-19
1989-05-09
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
249 82, 264261, 425356, 425363, 425425, 425447, B29C 3508, B32B 1710
Patent
active
048287849
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and to an apparatus for performing the method of producing a layer or lamina of plastics material between the two glass panes, wherein the plastics material in liquid form is fed between the two glass panes being maintained parallel and sealed at the outer edges thereof and a pressure is exerted on the surfaces of the glass panes.
Such methods and apparatus are already known. DE-AS No. 22 26 342, for example, specifies a method of producing a laminated glass comprising two glass panes bonded together by intermediate layer of self-curing, transparent plastics material capable of being cast, said two glass panes with a spacer separating and sealing the glass panes only at the edges thereof, being leant in vertical position against a tiltable plate and the space between them being filled at least in part with the liquid plastics material, the plate together with the two glass panes is then tilted slowly towards the horizontal position whereby a bulge or bowing in the glass pane averted from said plate resulting from the pressure of the liquid plastics material in the vertical position is reformed whereby the plastics material fills the whole space between the glass panes until an opening provided in the spacer for the ventilation is closed. The recession or reformation of the bulge of the glass pane may also be effected additionally by means of a suction cup connected by a hose to a subpressure source.
Furthermore, from DE-OS No. 27 28 762 a method is known of producing a laminated glass pane, wherein the space between two horizontal panes maintained parallel to each other by a spacer is filled with a plastics material. Measures to avoid the tendency of the glass panes to bulge outwards and inwards, respectively, which is caused by the pressure of the plastics material filled in and by the weight of the upper glass pane, are not considered in said publication.
Another method of producing laminated glass panes is specified in DE-OS No. 26 06 569. According to said method, the plastics material is filled into the interspace between the two glass panes in the inclined position and the curing proper takes place in the horizontal position.
Further, from DE-PS No. 27 37 740 a method is known of producing a laminated glass consisting of two glass panes and one intermediate layer wherein an already finished layer of plastics material is glued as intermediate layer between the glass panes, and the glass panes are pressed against the layer of plastics material by means of rotatable rollers in order to avoid gas bubbles in the adhesive lamina. This method of bonding glass plates and intermediate layer is, however, expensive and requires, moreover, a pre-fabricated layer of plastics material.
CH-PS No. 574 371 relates to a sound-absorbing glazing in the form of a laminated body of two glass panes surrounding a layer of plastics material. In a method of producing such a laminated body the glass panes are placed in a water reservoir in the vertical position for filling in the plastics material. In order to prevent the tendency of the glass panes to bulge, the process is carried out with different water levels depending on the pressure ratios and thickness of the glass panes. This method does not limit the hydrostatic pressure but compensates by hydrostatic counterpressure the continuously increasing hydrostatic pressure which is extraordinarily high in case of large glass panes. The elaborate and complicated character of this method due to the large pressure-stable water reservoir is obvious and does, moreover, not guarantee that the opposing glass panes are plane-parallel, which is rendered still more difficult because, as it is known, self-supporting glass panes are not entirely vertical.
It is the object of the invention to provide a method which can be performed with simple means and a simple device for performing said method which allows the production of flawless panes of plastics material and/or laminated glass panes.
In the method according to the invention filling process
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Lowe James
O'Keefe Joseph J.
UCB S.A.
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