Search

CN-120516892-B - Method for producing injection-molded part, injection-molded part and intermediate product

CN120516892BCN 120516892 BCN120516892 BCN 120516892BCN-120516892-B

Abstract

The invention relates to a method for producing an injection-molded part (50), wherein in particular the following steps are carried out a) providing an insert film or insert sheet, wherein the insert film or insert sheet (10) comprises a tactile layer (11), b) applying a buffer protection film comprising an adhesive layer (21) and a buffer layer (22) onto the tactile layer (11) of the insert film or insert sheet (10), c) inserting the insert film or insert sheet (10) into an injection mold (60) of an injection-molding machine such that the buffer protection foil (20) is in contact with the walls of the injection mold (60), d) back-injection-molding the insert film or insert sheet (10) with a plastic compound to provide the injection-molded part (50), e) removing the injection-molded part (50) from the injection mold (60).

Inventors

  • QIAN CHEN
  • LI LINFENG
  • FANG FANG

Assignees

  • 库尔兹压烫科技（合肥）有限公司

Dates

Publication Date
20260508
Application Date
20250709

Claims (20)

  1. 1. A method for producing an injection molded part (50), wherein the following steps are performed in the following order: a) Providing an embedded film or sheet, wherein the embedded film or sheet (10) comprises a tactile layer (11); b) Applying a buffer protection foil comprising an adhesive layer (21) and a buffer layer (22) onto the tactile layer (11) of the embedded film or sheet (10); c) -embedding the embedding film or sheet (10) in an injection mould (60) of an injection moulding machine, such that the buffer protection foil (20) is in contact with a wall of the injection mould (60); d) Back injection molding the insert film or insert sheet (10) with a plastic compound to provide an injection molded part (50); e) The injection molded part (50) is removed from the injection mold (60).
  2. 2. The method according to claim 1, It is characterized in that After step e), the following steps are performed: f) -peeling the buffer protection foil (20) of the injection molded part (50).
  3. 3. The method according to claim 1 or 2, It is characterized in that The insert film or insert sheet (10) comprises a carrier film to which the tactile layer (11) is applied.
  4. 4. The method according to claim 1 or 2, It is characterized in that The tactile layer (11) comprises a tactile pattern having ridges and depressions.
  5. 5. The method according to claim 4, wherein the method comprises, It is characterized in that The ridge has a height in the range from 10 μm to 100 μm.
  6. 6. The method according to claim 4, wherein the method comprises, It is characterized in that The protuberance has a length and/or width in the range from 0.3mm to 20 mm.
  7. 7. The method according to claim 4, wherein the method comprises, It is characterized in that The recess has a width in the range from 0.1 mm to 3 mm.
  8. 8. The method according to claim 1 or 2, It is characterized in that The tactile layer (11) has a pencil hardness of F or better as measured according to ASTM D3363.
  9. 9. The method according to claim 1 or 2, It is characterized in that The tactile layer (11) comprises a UV curable lacquer.
  10. 10. The method according to claim 1 or 2, It is characterized in that The buffer protection foil (20) has a thickness in the range from 10 μm to 100 μm.
  11. 11. The method according to claim 1 or 2, It is characterized in that The adhesive layer (21) of the buffer protection foil (20) has an adhesive force on the tactile layer (11) in the range from 0.01N/25 mm to 1N/25 mm.
  12. 12. The method according to claim 1 or 2, It is characterized in that The buffer protection foil (20) has a tensile strength in the range from 0.5N/mm 2 to 25N/mm 2 .
  13. 13. The method according to claim 1 or 2, It is characterized in that The buffer protection foil (20) has an elongation in the range from 100% to 250%.
  14. 14. The method according to claim 1 or 2, It is characterized in that The adhesive layer (21) has a thickness in the range from 0.5 μm to 3 μm.
  15. 15. The method according to claim 1 or 2, It is characterized in that The adhesive layer (21) has a hardness of Shore A50 or less measured by using a Shore A hardness tester.
  16. 16. The method according to claim 1 or 2, It is characterized in that The adhesive layer (21) includes a pressure-sensitive adhesive having an acrylic component.
  17. 17. The method according to claim 1 or 2, It is characterized in that The buffer layer (22) has a thickness in the range from 10 μm to 100 μm.
  18. 18. The method according to claim 1 or 2, It is characterized in that The buffer layer (22) has a glass transition temperature in a range from 80 ℃ to 110 ℃.
  19. 19. The method according to claim 1 or 2, It is characterized in that The buffer layer (22) comprises at least one material or combination of materials selected from polyvinyl chloride (=pvc), polyethylene (=pe) and/or polypropylene (=pp).
  20. 20. The method according to claim 1 or 2, It is characterized in that The buffer layer (22) has a hardness of Shore A25 or less as measured by using a Shore A hardness tester.

Description

Method for producing injection-molded part, injection-molded part and intermediate product Technical Field The present invention relates to a method for producing injection molded parts, as well as injection molded parts and intermediate products. Background To produce the decorative molded part, an insert molding process is typically used. For this purpose, the insert, which may be an insert film or insert sheet, is back-injected (back injected) with a plastic compound in an injection molding machine. To provide an injection molded part with a tactilely perceptible surface, these insert sheets or films include a tactile layer. The tactile layer then forms the outermost layer of the injection molded part. Typically, these insert sheets or films are first deep drawn or vacuum formed prior to back injection molding. The preformed insert sheet or film is then placed in an injection molding machine and back-injected. The outer tactile layer is severely damaged and deformed due to the high temperature and pressure during injection molding, deep drawing and vacuum forming. This results in a reduced haptic effect that does not meet customer requirements in terms of tactile feel or visual appearance. Disclosure of Invention It may be an object to provide a method for producing an injection molded part comprising a haptic structure and an injection molded part comprising a haptic structure, wherein the generated haptic effect is improved. This object is achieved by a method for producing an injection-molded part, wherein the following steps are carried out, in particular, in the following order: a) Providing an embedded film or sheet, wherein the embedded film or sheet comprises a tactile layer; b) Applying a buffer protective film comprising an adhesive layer and a buffer layer to the tactile layer of the embedded film or embedded sheet; c) Embedding the insert film or insert sheet in an injection mold of an injection molding machine such that the buffer protection foil is in contact with a wall of the injection mold; d) Back injection molding the insert film or insert sheet with a plastic compound to provide an injection molded part; e) The injection molded part is removed from the injection mold. This object is also achieved by an injection-molded part, in particular produced by a method according to one of claims 1 to 29, Wherein the injection molded part comprises a base body composed of a plastic compound and a tactile layer fixedly connected to the base body. In addition, this object is achieved by an intermediate product comprising an injection molded part according to one of claims 30 to 36, preferably produced by a method according to one of claims 1 to 29, wherein the intermediate product further comprises a releasable cushioning protection foil, the cushioning protection foil being contiguous with the tactile layer, wherein the cushioning protection foil comprises an adhesive layer and a cushioning layer. The invention now makes it possible to provide an injection molded part with an external tactile layer, whereby the tactile layer is substantially unchanged in its shape compared to the tactile layer of the insert sheet or insert film in the undeformed state. In other words, the tactile structure or tactile layer of the finished injection molded part is not deformed at all or is only minimally deformed. This is achieved in particular by the fact that the buffer protection foil is a layer that is in contact with the walls of the mould during a forming process such as deep drawing or vacuum forming or injection moulding and acts as a kind of damping layer. The high pressures and temperatures prevailing during the forming process now compress the cushioning protection foil, but not the tactile layer. The result is an injection molded part with an outer tactile layer whose structure has a high quality optical appearance and is also very perceptible for the tactile sensation. Layers and/or films are understood to mean in particular substantially planar structures, which are correspondingly single-layer or multilayer. The membrane is preferably self-supporting. The layer is for example self-supporting or non-self-supporting. Advantageous embodiments of the invention are described in the dependent claims. It may be further provided that the following steps are performed after step e): f) The buffer protection foil of the injection molded part is peeled off. After carrying out method step f), an injection molded part comprising a matrix and an embedded foil or sheet is preferably obtained, wherein the tactile layer is on the outside. As long as step f) is not performed, an intermediate product corresponding to the finished injection molded part is preferably obtained, but with the difference that the buffer protection foil remains on the tactile layer. The buffer protection foil then continues to serve as a protective layer for further processing steps or for transporting the intermediate product or injection m