Method of an apparatus for weather resistance test

• US 4,995,273 A
• Filed: 05/18/1989
• Issued: 02/26/1991
• Est. Priority Date: 05/31/1988
• Status: Expired due to Term

• Current Assignee: Dainippon Plastics Co. Ltd. (Itochu Corporation), Iwasaki Electric Company Limited
• Original Assignee: Dainippon Plastics Co. Ltd. (Itochu Corporation)
• Inventors: Kisima, Yoshio, Goto, Hitoshi, Iwanaga, Teruo
• Primary Examiner(s): YASICH, DANIEL
• Application Number:
  US07/353,727
• Time in Patent Office: 649 Days
• Field of Search: 374/7, 374/28, 374/57, 73/865.6, 73/150 R
• US Class Current: 73/865.6
• CPC Class Codes: G01N 17/00 Investigating resistance of materials to the weather, to corrosion, or to light
• CPC Class Codes: G01N 17/004 to light

Abstract

A method of and apparatus for weather resistance test comprising a process for washing the surface of samples with a cleaner which is added at least between a process for condensing moisture on the surface of the sample after ultraviolet radiation has been applied and the process for again applying ultraviolet radiation after the process for condensing moisture. Impurities adhered to the surface of the sample and substances extracted on the surface of the sample can be removed by washing with the cleaner so that the surface of the sample to which these impurities and substances are adhered intact can be protected from being baked in the ensuing ultraviolet radiation application process. Consequently, generation of spot patterns and excessive color change of the surface of the sample can be prevented.

Claims

1. An apparatus for performing weather resistance test on a sample surface comprising:

means for holding a sample having a surface to be tested;

means including a source of ultraviolet light for applying ultraviolet rays to said sample surface;

means including a source of moisture of condensing moisture on the surface of said sample;

means for washing said surface of said sample with a cleaner; and

means for controlling a repetitive cycle of operation of each of said means such that said ultraviolet light source is turned on for a first period of time after which the application of ultraviolet rays is terminated, whereafter said condensing means is operated for a second period of time after which the condensing is concluded, and said washing means is operated at least for a time between the time said condensing operation is concluded and said ultraviolet light source is turned on.

2. An apparatus for performing weather resistance tests according to claim 1, wherein said means for applying ultraviolet rays comprises a metal halide lamp radiating energy predominantly in a wavelength region from 300 to 450 nm and a filter for restricting said wavelength region to substantially 300 to 450 nm.

3. An apparatus for performing weather resistance tests according to claim 2, wherein said means for washing comprises spray nozzles disposed to spray said cleaner upon said sample surface.

4. An apparatus for performing weather resistance tests according to claim 2, wherein said means for holding said sample is inclined with respect to a horizontal plane.

5. An apparatus for performing weather resistance tests according to claim 4, wherein said means for washing comprises spray nozzles disposed to spray said cleaner upon said sample surface.

6. An apparatus for performing weather resistance tests according to claim 1, wherein said means for holding said sample is inclined with respect to a horizontal plane.

7. An apparatus for performing weather resistance tests according to claim 6, wherein said means for washing comprises spray nozzles disposed to spray said cleaner upon said sample surface.

8. An apparatus for performing weather resistance tests according to claim 1, wherein said means for washing comprises spray nozzles disposed to spray said cleaner upon said sample surface.

9. A method for performing a weather resistance test on a sample surface comprising the steps of:

(a) exposing said sample surface to ultraviolet light radiation for a first period of time, after which said radiation exposure is terminated;

(b) subjecting said sample to a process for condensing moisture on said surface for a second period of time, after which said condensing process is concluded; and

(c) repeating alternately said ultraviolet light radiation exposure and said moisture condensing steps;

wherein said method includes the further steps of

(d) at least between said ultraviolet light radiation exposure step and said moisture condensing step, washing said surface to remove contaminants therefrom.

10. The method of claim 9, wherein said washing step is performed by spraying a cleaning solution from a spray nozzle onto said sample surface.

11. The method of claim 9, wherein said washing step is performed at the conclusion of said moisture condensing step before repetition of said ultraviolet light radiation exposure step.

12. The method of claim 11, wherein said washing step is performed by spraying a cleaning solution from a spray nozzle onto said sample surface.

13. The method of claims 11, wherein said washing step is also performed during said moisture condensing step.

14. The method of claim 13, wherein said washing step is performed by spraying a cleaning solution from a spray nozzle onto said sample surface.

15. The method of claim 11, wherein said washing step is also performed after termination of said ultraviolet light radiation exposure step before beginning said moisture condensing step.

16. The method of claim 15, wherein said washing step is performed by spraying a cleaning solution from a spray nozzle onto said sample surface.

17. The method of claim 15, wherein said washing step is also performed during said moisture condensing step.

18. The method of claim 17, wherein said washing step is performed by spraying a cleaning solution from a spray nozzle onto said sample surface.