Method for producing a shaped plastic part having a decorated surface

Patent metadata

Field	Value
Publication number	US-11628605-B2
Application number	US-201816483154-A
Country	US
Kind code	B2
Filing date	Jan 31, 2018
Priority date	Feb 9, 2017
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A method for producing a shaped plastic part having a decorated surface, having the steps of:
providing a plastic intermediate product having an injection-molded part and at least a first decorative ply of a first stamping film providing a second stamping film with a second decorative ply, hot stamping the second stamping film onto the plastic intermediate product and/or onto the injection-molded part.

A shaped plastic part including an injection-molded part with at least a first and a second region of surface, a first decorative ply and a second decorative ply, wherein the first decorative ply is arranged at least in the first region of surface and the second decorative ply is arranged at least in the second region of surface.

First claim

The invention claimed is:

1. A method for producing a shaped plastic part having a decorated surface, comprising:
arranging or introducing a first stamping film with a first decorative ply in or into a cavity of an injection mold,
back injection molding the first stamping film with a plastic compound at least in regions, with the result that the first stamping film and/or the first decorative ply is/are joined to an injection-molded part at least in a first region of surface of the injection-molded part to form a plastic intermediate product,
providing a second stamping film with a second decorative ply,
hot stamping the second stamping film onto the plastic intermediate product in at least a second region of surface of the injection-molded part.

2. The method according to claim 1 , wherein the second stamping film or the second decorative ply of the second stamping film is applied to the plastic intermediate product in such a way that the second stamping film or the second decorative ply directly adjoins the first decorative ply.

3. The method according to claim 1 , wherein the second stamping film or the second decorative ply is applied to the plastic intermediate product in such a way that the second stamping film or the second decorative ply overlaps the first decorative ply in regions.

4. The method according to claim 3 , wherein the second stamping film or the second decorative ply overlaps the first decorative ply by at most 5 mm.

5. The method according to claim 1 , wherein the injection-molding process or the back injection molding is effected at a temperature of from 180° C. to 350° C.

6. The method according to claim 1 , wherein the injection-molding process or the back injection molding is effected under an injection pressure of from 800 bar to 3000 bar.

7. The method according to claim 1 , wherein the injection-molding process or the back injection molding is effected for an injection time of from 0.5 seconds to 30 seconds.

8. The method according to claim 1 , wherein the hot stamping is effected at a stamping temperature of from 80° C. to 250° C.

9. The method according to claim 1 , wherein the hot stamping is effected under a stamping pressure of from 1 N/mm 2 to 10 N/mm 2 , and/or with a stamping force of from 1000 N to 10,000 N.

10. The method according to claim 1 , wherein the hot stamping is effected at a stamping speed of from 1 m/min to 10 m/min.

11. The method according to claim 1 , wherein the first and/or second stamping film has a carrier ply, wherein the carrier ply has a layer thickness of from 6 μm to 250 μm.

12. The method according to claim 11 , wherein the carrier ply of the first and/or of the second stamping film is detached from the first or second decorative ply, after the first decorative ply has been securely joined to the injection-molded part at least in regions or after the second decorative ply has been securely joined to the plastic intermediate product or the injection-molded part at least in regions.

13. The method according to claim 1 , wherein the first and/or second stamping film has a detachment layer, wherein the detachment layer has a layer thickness of from 0.001 μm to 1 μm.

14. The method according to claim 1 , wherein the first and/or second decorative ply has a metallization, wherein the metallization has a layer thickness of from 5 nm to 100 nm.

15. The method according to claim 1 , wherein the decorative plies are formed identical.

16. The method according to claim 1 , wherein the injection-molded part is formed substantially cylindrical.

17. The method according to claim 1 , wherein at least one top surface and/or one base surface of the injection-molded part is decorated with the first decorative ply at least in regions.

18. The method according to claim 1 , wherein at least one region of a lateral surface of the injection-molded part is decorated with the second decorative ply.

19. A method for producing a shaped plastic part having a decorated surface, comprising:
providing a plastic intermediate product having an injection-molded part and at least a first decorative ply, wherein the first decorative ply is arranged at least in a first region of surface of the injection-molded part,
providing a second stamping film with a second decorative ply,
hot stamping the second stamping film onto the plastic intermediate product in at least a second region of surface of the injection-molded part,
wherein the second stamping film or the second decorative ply of the second stamping film is applied to the plastic intermediate product in such a way that the second stamping film or the second decorative ply directly adjoins the first decorative ply, and
wherein the plastic intermediate product is produced by at least the following steps:
arranging or introducing a first stamping film with the first decorative ply in or into a cavity of an injection mold,
back injection molding the first stamping film with a plastic compound at least in regions, with the result that the first stamping film and/or the first decorative ply is/are joined to the injection-molded part at least in the first region of surface of the injection-molded part.

Assignees

• Leonhard Kurz Stiftung & Co Kg

Inventors

• Burger Harald

Classifications

• B29C2045/0079

  applying a coating or covering · CPC title

• B29C45/14778 Primary

  the article consisting of a material with particular properties, e.g. porous, brittle · CPC title

• B29C59/00

  Surface shaping {of articles}, e.g. embossing; Apparatus therefor {(in-mould printing B29C37/0025; by using liquids B29C71/0009; by using gases without chemical reaction B29C71/009; for decorating in general B44; abrasive blasting B24C; chemical aspects C08J7/00)} · CPC title

• B29C59/02

  by mechanical means, e.g. pressing {(B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627)} · CPC title

• B29C45/0053

  combined with a final operation, e.g. shaping (injection-compression moulding B29C45/561) · CPC title