Device for extruding a polymer frame onto a plate-shaped object

Abstract

This invention concerns a device used in the process of manufacturing an automobile pane 1 equipped with a polymer frame 52 placed on the edge of the pane 1. The frame 52 is extruded onto the pane 1 which can be moved by means of a suitable support in such a way that the edge of the pane travels through a recess in an extrusion head 25 and 40. The recess of the extrusion head 40 preferably includes a U-shaped jaw 41 straddling the edge of the pane. At the front extremity of the two half-jaws of the U-shaped jaw 41 there are disposed sealing ledges or shoes 42 and 43 which are movable perpendicularly to the surfaces of the pane and which, during extrusion, bear upon the surfaces of the pane. Alternatively, the extrusion head can include a fixed jaw where the sealing ledges or shoes slideably and sealingly contact the plate.

Description

TECHNICAL FIELDThis invention concerns a device for extruding a profiled cord of polymer onto the periphery of an essentially state-shaped object, in particular onto the periphery of a pane. The device comprises an extrusion head in relative displacement along the edge of the plate, where it deposits a profiled cord composed of a polymer at the outlet from a calibrated nozzle. The invention concerns, more specifically, the case in which the plate is moved while the extrusion head has only reduced mobility and is generally retained in a fixed position.BACKGROUND OF THE INVENTIONIt is known in the art to utilize various devices for depositing a profiled frame onto the periphery of a pane, such as an automobile glazing. These devices comprise supporting and displacing elements for the pane onto which the profiled frame is to be deposited with the relative movement between pane and extrusion head along the edge of the pane being produced to place the frame on the peripheral edge of the ...

AI Technical Summary

Benefits of technology

Another embodiment of the invention relates to an apparatus for producing a shaped polymer frame on a plate having top and bottom main surfaces and a peripheral edge. The apparatus further comprises an extrusion die having a one-piece body that defines a plate receiving recess for receiving the edge of the plate and portions of the main surfaces adjacent thereto. The plate receiving recess comprises first and second sealing ledges which slidingly engage the main surfaces of the plate. An open area is defined between the die body, sealing ledges and the plate in the shape of the polymer frame, and the sealing ledges provide a seal for the recess and facilitate sliding movement between the die body and the main surfaces. The apparatus also includes means for providing relative movement between the die and plate, such that the edge of the plate advances through the recess to receive the shaped polymer frame on the edge and at least one of the main surfaces of the plate.

Problems solved by technology

Since the tolerance of automobile panes is not precisely controlled by the pane manufacturer, it is difficult to precisely place a polymer frame on the edge of the pane.

This process is cumbersome and results in duplicative operation as well as handling and storage problems for the cured polymer frame.

Another difficulty of prior art devices is that a secure seal to the pane is not always achieved.

This can result in the escape of polymer from between the seal and the glass surface.

Furthermore, movement between the die head and the pane becomes difficult if the seal between the die head and the pane is too strong.

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