US3701222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous sheet graining process
Assignee: Richardson Co
•
Filing: 1971-12-13
•
Granted: 1972-10-31
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Expires: 1991-12-13
Abstract
Abstract This invention relates to the graining of metal sheet especially of the type employed as the supporting base for lithographic printing plates. More particularly, this invention relates to the continuous ball graining of such metal sheet and processes for effecting such continuous ball graining.
Inventors
- 👤 Reno J Testolin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:01
CPC Classifications
B; B24; B24B; B24B39/00; B24B39/06; B24B39/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A continuous process for the graining of metal sheet which comprises continuously charging a strip of the metal sheet to a graining zone, contacting the metal sheet therein with agitated particles in the presence of a particulate abrasive, continuously charging fresh abrasive to the graining zone and withdrawing spent abrasive therefrom, maintaining the metal sheet within the graining zone for a period of time sufficient to roughen at least its upper surface by action of the abrasive and thereafter continuously recovering the surface roughened strip of metal sheet from the graining zone.
Claim 2
Dependent Claim
92 words
A continuous process for the graining of metal sheet which comprises continuously charging a strip of the metal sheet to a graining zone, contacting the metal sheet therein with agitated particles in the presence of a particulate abrasive, continuously charging fresh abrasive to the graining zone and withdrawing spent abrasive therefrom, maintaining the metal sheet within the graining zone for a period of time sufficient to roughen at least its upper surface by action of the abrasive and thereafter continuously recovering the surface roughened strip of metal sheet from the graining zone.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the roughened metal sheet from the graining zone is first passed through a washing zone prior to recovery and is contacted therein with water to remove adhering abrasive.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein the strip of metal sheet prior to being charged to the graining zone is passed through a degreasing zone to remove surface contamination.
Claim 5
Dependent Claim
41 words
The process of claim 1 wherein the agitated particles are metal graining balls having a diameter of from about 0.25 to about 0.5 inches and have an imparted oscillatory movement equivalent to from about 50 to about 250 revolutions per minute.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the particulate abrasive is present in an aqueous slurry.
Claim 7
Dependent Claim
21 words
The process of claim 5 wherein the particulate abrasive has a diameter average ranging from about 50 to about 175 microns.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein the abrasive slurry contains a metal cleaner.
Claim 9
Dependent Claim
41 words
The process of claim 1 wherein the particulate abrasive is continuously charged and withdrawn from the graining zone at a rate equivalent to from about 0.15 to 1.0 pounds of abrasive per minute per square foot of metal sheet being grained.
Claim 10
Dependent Claim
30 words
The process according to claim 1 wherein the particulate abrasive is charged and withdrawn from the graining zone in countercurrent flow to the direction of the strip of metal sheet.
Claim 11
Dependent Claim
41 words
The process of claim 1 wherein the strip of metal sheet is maintained within the graining zone for a period sufficient to produce a grained metal sheet having a wetability angle with distilled water of from about 0* to about 30*.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein the strip of metal sheet is composed of aluminum.
Claim 13
Dependent Claim
21 words
The process of claim 1 wherein the particulate abrasive is selected from the group consisting of sand, pumice, marble and quartz.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |