Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Flash or sprue removal type
Patent
1997-09-11
2000-03-21
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Flash or sprue removal type
52204591, 264163, 264252, 264259, 296 841, 296 90, 296 93, 425127, 425292, 425298, B29C 3700
Patent
active
060399074
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for postforming an extruded section piece consisting of a malleable material, especially a polymer, particularly in the region where a looped section piece connects to the peripheral part of an object. In this method, a mould, the cavity of which corresponds to the desired section of the section piece is lowered onto the latter by pivoting about an axis oriented parallel to the longitudinal axis of the said section piece. The invention furthermore relates to an appropriate device for the implementation of the method.
A method of this type, known and described in the document DE 9011573 U1 serves for the postforming of a profiled strip consisting of a reactive system based on polyurethane and extruded and applied to window glass. In this method, the mould is composed of a device equipped with two jaws which is guided in an open position from the outside over the peripheral part of the window glass, which part is equipped with the profiled strip. The axis of pivoting of the two jaws is located outside of the object. After the mould has been positioned, the surface of the window glass opposite the profiled strip is located in a recess of one of the jaws, the other jaw which imparts its shape to the strip tilts about the axis of pivoting and is pressed onto this strip.
In the region of the profiled strip to be postformed, there is normally an excess of polymer material which has to be removed during the postforming operation. To this end, the known device is equipped with a removal channel through which the material is pushed back towards the looked-through surface of the window glass. This excess material has to be taken off subsequently. As it sticks to the surface of the glass, subsequent removal of this material gives rise to difficulties.
The object of the present invention is to conceive a method of the previous type which makes it easier to remove the excess material which arises during postforming.
In order to solve the technical problem, the invention proposes a method for postforming a section piece extruded on the surface of an object in which method a mould exhibiting a cavity corresponding to the shape of the section piece is placed over the section piece in a rotation movement, in which the axis of rotation is situated in the immediate vicinity of the surface of the object. According to the invention, the axis of rotation is situated on the side of the section piece opposite to the edge of the object. For preference, the mould during its rotation gives rise to the material of the section piece being pushed towards the outside of the surface of the object.
Thus, in the method according to the invention, as in the prior art, the motion for closing the mould is a motion of rotation. However, as a result of the position of the axis of pivoting with respect to the surface of the object equipped with the profiled strip, the mould cavity and the surface of the object constitute a closed space. In this way, during the closure operation, that side of the section piece which is turned towards the central part of the object is limited by the mould first of all. As soon as the mould is applied against the surface of the object, it is no longer possible for any material constituting the section piece to escape on this side during the forming process. Rather, by continuing with the operation of closing the mould, material is pushed back in the direction of the outside. When the profiled strip is extruded and applied to the peripheral part of window glass, the excess mass is thus pressed and discharged beyond the lateral face of the window glass, where it can be taken away relatively simply. However, even in cases in which the profiled strip is not applied to the immediate periphery of the window glass, but is applied further towards the internal part of the latter, the removal of excess material from the surface of the said window glass situated on one side of the strip only can be performed more easily than if the excess material has to be removed from the surface of
REFERENCES:
patent: 4688752 (1987-08-01), Barteck et al.
patent: 5302333 (1994-04-01), Capriotti et al.
patent: 5599416 (1997-02-01), Kuwahara
Kittel Florenz
Koette Rolf
Krumm Helmut
Motzheim Ralf
Lee Dae Young
Saint Gobain Vitrage
Silbaugh Jan H.
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