Claims
- 1. An automotive exterior panel with a smooth surface comprising:a blow molded article of a noncrystalline resin exhibiting a tensile modulus of 2000 Kg/cm2 or more at 75° C., wherein said blow molded article has surface irregularities comprising a surface roughness in the range of from 0.9 to 9.0 μm and an average peak-to-peak distance in the range of from 10 to 150 μm, and wherein said panel has a 15 to 150 μm thick paint film.
- 2. An automotive exterior panel according to claim 1, wherein said panel is produced by disposing a parison, which is composed of a noncrystalline resin exhibiting a tensile modulus of 2000 Kg/cm2 or more at 75° C., between mold halves having minute concavities/convexities such that the surface roughness is in the range of from 0.9 to 9.0 μm and the average peak-to-peak distance is in the range of from 10 to 150 μm;closing said mold halves to from a cavity; adhering said parison to said mold halves by introducing thereinto a pressurized air to said cavity whose surface temperature is set to Y° C. which falls in a range of Y=(0.96X+3) to Y=(0.96X+40), where X is a temperature at which the tensile modulus of the noncrystalline resin is 2000 Kg/cm2; opening said mold halves and removing said hollow molded article; and painting an external face of said hollow molded article with a 15 to 150 μm thick paint film.
- 3. An automotive exterior panel with a smooth appearance, comprising:a blow molded article of a crystalline resin exhibiting a flexural modulus of 9000 Kg/cm2 or more at 23° C., wherein said blow molded article has surface irregularities comprising a surface roughness in the range of from 0.9 to 9.0 μm and an average peak-to-peak distance in the range of from 10 to 150 μm, and wherein said panel has a 15 to 150 μm thick paint film.
- 4. An automotive exterior panel according to claim 3, wherein said panel is produced by disposing a parison, which is composed of a crystalline resin exhibiting a flexural modulus of 9000 Kg/cm2 or more at 23° C., between mold halves having minute concavities/convexities such that the surface roughness is in the range of from 0.9 to 9.0 μm and the average peak-to-peak distance is in the range of from 10 to 150 μm;closing said mold halves to form a cavity; adhering said parison to said mold halves by introducing a pressurized air to said cavity whose surface temperature is raised during the adhesion to y° C. which falls in the range of A<y<1.07B, where A is a peak crystallization temperature (° C.) in a DSC curve of the crystalline resin which exhibits a flexural modulus of 9000 Kg/cm2 or more at 23° C.; and B is a peak fusion temperature (° C.) in a DSC curve of the crystalline resin which exhibits a flexural modulus of 9000 Kg/cm2 or more at 23° C.; opening said mold halves and removing said hollow molded article; and painting an external face of said hollow molded article with a 15 to 150 μm thick paint film.
- 5. An automotive exterior panel according to claim 3, wherein said panel is produced by disposing a parison, which is composed of a crystalline resin exhibiting a flexural modulus of 9000 Kg/cm2 or more at 23° C., between mold halves having minute concavities/convexities such that the surface roughness is in the range of from 0.9 to 9.0 μm and the average peak-to-peak distance is in the range of from 10 to 150 μm;raising a cavity surface temperature so as to reach a temperature y° C. falling in the range A<y<1.07B, where A is a peak crystallization temperature (° C.) in a DSC curve of the crystalline resin which exhibits a flexural modulus of 9000 Kg/cm2 or more at 23° C. while B is a peak fusion temperature (° C.) in a DSC curve of the crystalline resin which exhibits a flexural modulus of 9000 Kg/cm2 or more at 23° C.; closing said mold halves to form a cavity; adhering said parison to said mold halves by introducing a pressurized air into the cavity; opening said mold halves and removing said hollow molded article; and painting an external face of said hollow molded article with a 15 to 150 μm thick paint film.
- 6. An automotive exterior panel according to claim 3, wherein said crystalline resin exhibiting a flexural modulus of 9000 Kg/cm2 or more at 23° C. is incorporated with 3% to 35% by weight of an inorganic filler.
- 7. An automotive exterior panel according to claim 3, wherein said crystalline resin exhibiting a flexural modulus of 9000 Kg/cm2 or more at 23° C. is polypropylene.
- 8. An automotive exterior panel according to claim 1 wherein said non-crystalline resin comprises one or more non-crystalline resins chosen from the group of resins consisting of Polycarbonate (PC), Polystyrene (PS), styrene acrylonitrile (SAN), polyvinyl-chloride (PVC), noncrystalline polyamide, polysulfone, modified polyphenylene oxide (PPO), and a mixture of acrylonitrile, butadiene, and styrene (ABS).
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-236485 |
Aug 1998 |
JP |
|
10-199665 |
Jun 1998 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This is a divisional application which claims priority under 35 U.S.C. §120 to application U.S. application Ser. No. 09/344,801, filed on Jun. 25, 1999 now U.S. Pat No. 6,458,312, and priority under 35 U.S.C. §119 to Japanese Patent Applications No. 10-199665 filed on Jun. 30, 1998, and No. 10-236485 filed on Aug. 7, 1998, which are incorporated herein by reference for all purposes.
US Referenced Citations (7)
Number |
Name |
Date |
Kind |
4017243 |
Lindsay |
Apr 1977 |
A |
4176101 |
Leslie et al. |
Nov 1979 |
A |
5217729 |
Terauchi et al. |
Jun 1993 |
A |
5354618 |
Ishigaki et al. |
Oct 1994 |
A |
5585187 |
Shinonaga et al. |
Dec 1996 |
A |
5705254 |
Morinaga et al. |
Jan 1998 |
A |
5747592 |
Huff et al. |
May 1998 |
A |
Foreign Referenced Citations (1)
Number |
Date |
Country |
623448 |
Nov 1994 |
EP |