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=(0.96 X+3) to Y=(0.96 X+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 Who 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 5, 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 5, wherein said crystalline resin exhibiting a flexural modulus of 9000 Kg/cm2 or more at 23° C. is polypropylene.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-199665 |
Jun 1998 |
JP |
|
10-236485 |
Aug 1998 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This is a divisional application which claims priority under 35 U.S.C. §120 to co-pending application U.S. application Ser. No. 09/344,801, filed on Jun. 25, 1999, 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.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09344801 |
Jun 1999 |
US |
Child |
10051983 |
Jan 2002 |
US |