METHOD FOR PRODUCING A DECORATIVE MOLDED PART

Abstract

Method for producing a decorative molded part, in which a veneer is joined to a substrate on its rear side opposite a visible surface of the veneer, and in which the visible surface of the veneer is bleached differently to produce a bleaching pattern.

Claims

1. Method for producing a decorative molded part, in which a veneer is joined to a substrate on a rear side of the veneer opposite a visible surface of the veneer, wherein the visible surface of the veneer is bleached differently to produce a bleaching pattern.

2. Method according to claim 1, wherein a bleaching medium acts on surface segments of the visible surface of the veneer for different lengths of time.

3. Method according to claim 1, wherein surface segments of the visible surface of the veneer are masked during the process of bleaching.

4. Method according to claim 1, wherein a surface segment of the visible surface of the veneer is immersed in a bleaching medium for different lengths of time.

5. Method according to claim 1, wherein immersion of the veneer in a bleaching medium is carried out stepwise.

6. Method according to claim 1, wherein immersion of the veneer in a bleaching medium is continuous.

7. Method according to claim 1, wherein the veneer is immersed several times in a bleaching medium and that the veneer undergoes a change of position between each immersion, so that the veneer is immersed in the bleaching medium with a different alignment than in a preceding immersion process.

8. Method according to claim 1, wherein immersion of the veneer in a bleaching medium is carried out stepwise and that the veneer is immersed several times in a bleaching medium and that the veneer undergoes a change of position between each immersion, so that the veneer is immersed in the bleaching medium with a different alignment than in a preceding immersion process.

9. Method according to claim 1, wherein immersion of the veneer in a bleaching medium is continuous and that the veneer is immersed several times in a bleaching medium and that the veneer undergoes a change of position between each immersion, so that the veneer is immersed in the bleaching medium with a different alignment than in a preceding immersion process.

10. Method for producing a decorative molded part, comprising the steps of: bleaching a visible surface of a veneer forming a bleaching pattern on the visible surface of the veneer; and joining the veneer to a substrate, the veneer having a rear side opposite the visible surface with the rear side joined to the substrate.

11. Method for producing a decorative molded part according to claim 10 wherein: the bleaching pattern comprises different bleaching intensities.

12. Method for producing a decorative molded part according to claim 11 wherein: the bleaching pattern comprises graduated strips.

13. Method for producing a decorative molded part according to claim 11 wherein: the bleaching pattern comprises a continuous transition.

14. Method for producing a decorative molded part according to claim 10 wherein: said step of bleaching comprises immersing portions of the veneer in a bleaching medium for different exposure times.

15. Method for producing a decorative molded part according to claim 10 further comprising the step of: masking specific locations of the visible surface of the veneer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Therein:

[0021] FIG. 1 shows a schematic longitudinal sectional view of an embodiment of a decorative molded part;

[0022] FIG. 2 shows a first embodiment of a bleaching pattern;

[0023] FIG. 3 a second embodiment of a bleaching pattern;

[0024] FIG. 4 a third embodiment of a bleaching pattern and

[0025] FIGS. 5a to c show schematic cycles for producing another embodiment of a bleach pattern.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] FIG. 1 schematically shows a decorative molded part, characterized by reference sign 2, which has a veneer 4 as the decorative layer, which is provided with a lamination on the rear side and is connected to a substrate 6 with this lamination interposed. The substrate 6 has attachment elements, for example in the form of pins 8, which serve to mount and hold the decorative molded part 2 in the interior of a motor vehicle.

[0027] On the visible side of the veneer 4, characterized by reference sign 10, there is a cover layer 12 in the embodiment according to FIG. 1, which is formed from a transparent plastic by overmolding the veneer 4 opposite the substrate 6.

[0028] Various variants for forming a bleaching pattern characterized by reference sign 14 are illustrated below with reference to FIGS. 2 to 5.

[0029] The bleaching pattern 14 shown in FIG. 2 has strips 16. The different strips 16.1 to 16.6 correspond to the different levels of bleaching. The darkest, lowest strip 16.1 illustrates the maximum level of bleaching. The uppermost, lightest strip 16.6 indicates the minimum level of bleaching. A maximum level of bleaching can be achieved by maximum long or maximum intensive bleaching. It is assumed here that the bleaching medium has the same bleaching efficiency in each cycle of the bleaching process.

[0030] The bleaching pattern 14 shown in FIG. 2 is achieved by first immersing the veneer 4 corresponding to the lower strip 16.1 in the bleaching medium. After a first reaction time, the veneer is immersed in the bleaching medium by a further stage corresponding to the height of the second strip 16.2. After the same exposure time as in the first step, a further step is carried out so that the veneer 4 is now immersed in the bleaching medium according to the height of the strips 16.1 to 16.3. Further steps follow until, in the last step, the last strip 16.6 is also immersed in the bleaching medium. In the embodiments shown, the exposure time is identical in each individual step. This results in uniformly graduated strips 16.1 to 16.6 which form the bleaching pattern 14.

[0031] The embodiment shown in FIG. 3 is produced in a similar way to the embodiment shown in FIG. 2. Instead of a stepwise immersion of the veneer 4 in the bleaching medium, this is done continuously.

[0032] Thus, FIG. 3 shows continuous transitions of the bleaching levels. These are provided with the same maximum and minimum intensity as strips 16.1 and 16.6, respectively.

[0033] FIG. 4 shows a bleaching pattern 14 produced by rotating the position of the veneer 4 by 90 degrees at least between a first and a second sequence. The bleaching pattern 14 shown in FIG. 4 is initially based on the bleaching pattern shown in FIG. 2. After this bleaching pattern has been generated, the veneer 4 is rotated through 90 degrees and then again immersed stepwise in the bleaching medium as described with reference to FIG. 2. However, the times between the individual bleaching steps can be kept shorter before and after turning so that a maximum bleaching level is obtained in the lower right corner for a lowest square 18 corresponding to the bleaching level of the lowest strip 16.1. In the embodiment according to FIG. 4, the steps are selected identically in each case. This results in squares.

[0034] In the embodiment according to FIGS. 5a to c, the veneer 4 is initially immersed in the bleaching medium at a slight angle in a first bleaching cycle according to FIG. 5a. As a result, a lower triangle comprising two edge lengths of the veneer 4 is bleached. The veneer 4 is then kept immersed and rotated counterclockwise. However, the veneer 4 is immersed in such a way that the right corner of the square veneer 4 coincides with the level of the bleaching medium. The position of this corner is not changed during further immersion. This results in a second triangular design. By pivoting again, the veneer 4 is immersed deeper in the bleaching medium as shown in FIG. 5c. Three triangles 20 with different bleaching intensities appear on the visible side 10.

[0035] As before, further surface segments of veneer 4 can be created by pivoting and lowering the veneer 4 into the bleaching medium so that between the individual triangles 20 a gradation of bleaching levels is effected as shown in FIG. 2.

LIST OF REFERENCE SIGNS

[0036] 2 decorative molded part

[0037] 4 veneer

[0038] 6 substrate

[0039] 8 pin

[0040] 10 visible side

[0041] 12 cover layer

[0042] 14 bleaching pattern

[0043] 16 strip

[0044] 18 square

[0045] 20 triangle