Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Reexamination Certificate
1999-11-03
2001-08-14
Tentoni, Leo B. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
C264S320000, C264S322000
Reexamination Certificate
active
06274076
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention pertains to a forming mold for postforming of an shaped polymer cord that is extruded onto an object.
It is known that vehicle windows are equipped with a frame or frame-shaped elements by extruding directly onto a glass a shaped cord that is made of an extrudable polymer in a corresponding manner. Likewise, other plate-like objects such as, for example, doors can be equipped with a frame-shaped sealing joint. Generally, however, the shaped cord extruded onto the object has to be postformed in certain places, for instance, in the transition zone between the beginning and end of a closed frame. Such postforming may also be necessary or advantageous in the area of the corners of a shaped frame, particularly in the case of sharp corners.
Extrudable polymers that are used for the above-mentioned purposes include both reaction systems, for example, polyurethane systems that harden under the action of moisture, and thermoplastic systems. In the case of reaction systems, the postforming may be done right after the extrusion operation before the extruded polymer cord hardens. Such a postforming process and the appropriate compression molds for implementing it are described in documents U.S. Pat. No. 5,519,979 and German patent no. DE-G-U1 90 11 573. In the case of a reaction system, the postforming may also be done after the shaped cord hardens. A corresponding process and an appropriate mold for implementing it, comprising a forming mold, are the objects of documents U.S. Pat. No. 5,057,265.
Devices that comprise a forming mold for the postforming of the transition zone of a thermoplastic polymer frame that is extruded onto a glass are described in documents WO 95/35193 and WO 96/19339.
In all of the known devices for postforming, the forming surface of the forming mold is adapted over its entire length to the geometry of the extruded shaped cord. This means that, for example, in the case of an extruded frame on a flat glass, the shaped forming surface is rectilinear.
When postforming is done with the aid of the known forming mold, it may happen that joint lines, which are caused by the edges at the end faces of the forming mold, are visible at the transition points between the postformed section length and the lengths of the initial extruded sections. Such visible joint lines show up in particular when the dimensions, in terms of height, of the shaped extruded cord or the shape and thickness of the objects vary slightly within the limits of the given tolerances.
SUMMARY OF THE INVENTION
The present invention provides a method for postforming a length of shaped polymer cord that has been extruded on an object and has a predetermined height above the object, which comprises applying on the cord a forming surface extending in the direction along the length of the cord. The forming surface comprises two sections extending along the length of the cord with the first section engaging, at least in part, the object and the second section being disposed laterally of the first section for overlying the cord when the first section is in engagement with the object. The second section of the forming surface further comprises two portions extending along the length of the cord with the first portion being disposed at a height above the object which is less than the predetermined height and the second portion being disposed at a height greater than the predetermined height.
According to the invention, the second section of the forming surface may also comprise a center and two end portions extending along the length of the cord with the center portion being disposed at a height less than the predetermined height and the two end portions being disposed at a height greater than the predetermined height.
The present invention also provides a method for postforming a length of shaped thermoplastic polymer cord, which comprises applying a shaped thermoplastic polymer cord having a predetermined height on an object and applying on the cord a forming surface that has portions of different heights with one of the height being less than the predetermined height and the other height greater than the predetermined height. The method results in postforming the different heights onto the length of the shaped thermoplastic polymer cord.
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Abstract of German 2365723 (Jul. 9, 1973).
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Kittel Florez
Krumm Helmut
Pennie & Edmonds LLP
Saint-Gobain Vitrage
Tentoni Leo B.
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