Thin wall application with injection compression molding and in-mold roller

Patent metadata

Field	Value
Publication number	US-9908272-B2
Application number	US-201314774484-A
Country	US
Kind code	B2
Filing date	Mar 12, 2013
Priority date	Mar 12, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A method for making a thin wall component comprise: locating a film ( 40 ) in a mold cavity of a mold, wherein the mold cavity has an initial mold thickness, wherein the film comprises a base layer ( 41 ) and a pattern layer ( 42 ); injecting a molding material ( 60 ) into the mold cavity such that the molding material contacts the pattern layer, wherein the molding material comprises a polymeric material and a filler; compressing the mold to a final mold thickness that is less than the initial mold thickness, to form a molded product, wherein the pattern layer forms a surface of the molded product; and removing the molded product from the mold. A molded product formed by the method. The method produce a thin walled component without warpage, inner stresses, poor surface quality, or washout defects.

First claim

What is claimed is:

1. A method for making a thin wall component comprising:
locating a film in a mold cavity of a mold, wherein the mold cavity has an initial mold thickness, wherein the film comprises a base layer and a pattern layer, and wherein the pattern layer has a thickness of less than or equal to 0.05 mm;
injecting a molding material into the mold cavity such that the molding material contacts the pattern layer, wherein the molding material comprises a polymeric material and a filler;
compressing the mold to a final mold thickness that is less than the initial mold thickness, to form a molded product, wherein the pattern layer forms a surface of the molded product;
removing the molded product from the mold; and
removing the base layer from the molded product,
wherein a mold temperature is less than or equal to a heat deflection temperature of the molding material minus 25° C.

2. The method of claim 1 , wherein the film has a thickness of less than or equal to 0.03 mm.

3. The method of claim 1 , further comprising applying vacuum pressure to hold the film to a mold surface of the mold.

4. The method of claim 1 , wherein the mold is a variable cavity depth mold.

5. The method of claim 1 , wherein the molded product has a thickness of less than 2 mm.

6. The method of claim 1 , wherein the polymeric material comprises at least one material from polycarbonate, polyamide, acrylonitrile butadiene styrene, polybutylene terephthalate.

7. The method of claim 1 , wherein the filler is present in an amount of greater than or equal to 20 wt %, based upon a total weight of the molding material.

8. The method of claim 1 , wherein the molding material comprises greater than or equal to 20 wt % filler, based upon a total weight of the molding material; and wherein the mold final thickness is less than or equal to 1.5 mm.

9. The method of claim 1 , wherein the filler comprises at least one filler from glass fibers, steel fiber, and talc.

10. The method of claim 1 , wherein the mold temperature is less than or equal to the molding material heat deflection temperature minus 30° C.

11. The method of claim 1 , wherein the polymeric material is polycarbonate and the filler is glass fibers.

12. The method of claim 1 , further comprising introducing the film to the mold cavity from a first roller and removing the base layer from the mold cavity with another roller.

13. A molded product formed by the method of claim 1 .

14. The molded product of claim 13 , wherein the surface of the molded product is free from defects greater than 0.01 mm 2 over an area of greater than or equal to 600 cm 2 .

15. The molded product of claim 13 , wherein the molded product has a warpage of less than 0.5 mm across an area of 600 cm 2 as determined by checking warpage of all edges with feeler gauge on a marble top.

16. The molded product of claim 13 , wherein the molded product has a surface area of at least 600 mm 2 .

17. A method for making a thin wall component comprising:
moving a film from a roller into a mold cavity of a mold, wherein the mold cavity has an initial mold thickness, wherein the film comprises a base layer and a pattern layer, and wherein the pattern layer has a thickness of less than or equal to 0.05 mm;
injecting a molding material into the mold cavity such that the molding material contacts the pattern layer, wherein the molding material comprises a polymeric material and a filler;
compressing the mold to a final mold thickness that is less than the initial mold thickness, to form a molded product, wherein the pattern layer forms a surface of the molded product;
removing the molded product from the mold; and
removing the base layer from the mold onto another roller,
wherein a mold temperature is less than or equal to a heat deflection temperature of the molding material minus 25° C.

18. The method for making a thin wall component of claim 1 , wherein the filler is present in an amount between 20-50 wt %, based upon a total weight of the molding material.

19. The method for making a thin wall component of claim 17 , wherein the filler is present in an amount between 20-50 wt %, based upon a total weight of the molding material.

Assignees

• Cao Shipu
• Shen Qingya
• Yan Wei
• Kong Xin
• Sun Pei Helen
• Ho Harold
• Sabic Global Technologies Bv

Inventors

• Cao Shipu
• Yan Wei
• Shen Qingya
• Kong Xin
• Sun Pei Helen
• Ho Harold

Classifications

• B29C45/0013

  using fillers dispersed in the moulding material, e.g. metal particles · CPC title

• B29C45/14811

  Multilayered articles (B29C45/14827 takes precedence) · CPC title

• B29C2045/14704

  ink decorations · CPC title

• B29C45/14688 Primary

  Coating articles provided with a decoration · CPC title

• B29K2105/16

  Fillers · CPC title