1. A pressure relief device for venting an internally pressurized container comprised of:
a concave annular outer area having a selected thickness of at least about 0.024 inches;
a circular central area of the same selected thickness, the central area having a center point and an arc shaped score line extending through 132\xb0 to 138\xb0 about an arc center, the arc center offset from the center point of the circular area by a distance of from 0.288 to 0.292 inches, the score line being trapezoidal in transverse cross section and having a depth of from 0.010 to 0.012 inches; and
an annular intermediate area of the same selected thickness connecting the concave annular area to the circular area such that the intermediate area meets the circular area at an angle greater than 90\xb0 and the intermediate area meets the concave annular outer area at an angle greater than 90\xb0.
2. The pressure relief device of claim 1 wherein the score line has a base whose width is 0.034 inches.
3. The pressure relief device of claim 1 wherein the score line has a first side wall and a second side wall, each side wall extending between the top width and the bottom width, such that a first plane passing over a surface of one side wall and a second plane passing of over a surface of the second sidewall will intersect at an angle of 30\xb0.
4. The pressure relief device of claim 1 also comprising an annular lip attached to the concave annular outer area.
5. The pressure relief device of claim 1 wherein the pressure relief device is tin plated steel.
6. The pressure relief device of claim 1 wherein the arc center is offset from the center point of the circular area by a distance of from 0.290 inches.
7. The pressure relief device of claim 1 wherein the score line extends through an arc of 135\xb0.
8. The pressure relief device of claim 1 wherein the outer annular area has a maximum diameter of at least 3 inches.
9. An improved aerosol can of the type having a top containing a valve for releasing contents of the can, a can bottom and a sidewall attached to and extending between the top and the bottom wherein the improvement comprises the can bottom formed to have:
a concave annular outer area having a selected thickness of at least about 0.024 inches;
a circular central area of the same selected thickness, the central area having a center point and an arc shaped score line extending through 132\xb0 to 138\xb0 about an arc center, the arc center offset from the center point of the circular area by a distance of from 0.288 to 0.292 inches, the score line being trapezoidal in transverse cross section and having a depth of from 0.010 to 0.012 inches; and
an annular intermediate area of the same selected thickness connecting the concave annular area to the circular area such that the intermediate area meets the circular area at an angle greater than 90\xb0 and the intermediate area meets the concave annular outer area at an angle greater than 90\xb0.
10. The improved aerosol can of claim 9 wherein the score line has a base whose width is 0.034 inches.
11. The pressure relief device of claim 9 wherein the score line has a first sidewall and a second sidewall, each sidewall extending between the top width and the bottom width, such that a plane passing over a surface of one side wall and a second plane passing of over a surface of the second sidewall will intersect at an angle of 30\xb0.
12. The improved aerosol can of claim 9 also comprising an annular lip attached to the concave annular outer area and the sidewall.
13. The improved aerosol can of claim 9 wherein the pressure relief device is tinplate steel.
14. The improved aerosol can of claim 9 wherein the arc center is offset from the center point of the circular area by a distance of from 0.290 inches.
15. The improved aerosol can of claim 10 wherein the score line extends through an arc of 135\xb0.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. Liquid treatment equipment, comprising:
a treatment solution bath accommodating a treatment solution;
a holder holding a substrate and bringing a surface being treated of the substrate into contact with the treatment solution; and
an annular seal member sealing between the surface being treated of the substrate and the holder;
wherein, in a sealed state, at a boundary portion between an inner periphery surface of the seal member and a contact surface in contact with the surface being treated of the substrate, a brim portion of a radius of curvature of 0.5 mm or less exists.
2. The liquid treatment equipment as set forth in claim 1:
wherein the contact surface is formed in an approximate plane, and the inner periphery surface is formed in an approximate plane and approximately vertical with respect to the contact surface.
3. The liquid treatment equipment as set forth in claim 1:
wherein the contact surface is formed in a radius of curvature of 0.1 mm or more.
4. The liquid treatment equipment as set forth in claim 1, further comprising:
a suction member disposed in the holder and sucking either one of a gas and bubbles present in the neighborhood of the surface being treated of the substrate.
5. Liquid treatment equipment, comprising:
a treatment solution bath accommodating a treatment solution;
a holder holding a substrate and bringing a surface being treated of the substrate into contact with the treatment solution;
a first electrode disposed in the-holder and coming into contact with the surface being treated of the substrate;
a second electrode disposed in the treatment solution bath and applied thereto a voltage between the first electrode; and
an annular seal member comprising an inside seal portion disposed more inside than a contact portion to seal the contact portion between the first electrode and the surface being treated of the substrate and an outside seal portion disposed more outside than the contact portion;
wherein, in a sealed state, at a boundary portion between an inner periphery surface of the inside seal portion and a contact surface in contact with the surface being treated of the substrate, a brim portion of a radius of curvature of 0.5 mm or less exists.
6. The liquid treatment equipment as set forth in claim 5:
wherein the contact surface is formed in an approximate plane, and the inner periphery surface is formed in an approximate plane and approximately vertical with respect to the contact surface.
7. The liquid treatment equipment as set forth in claim 5:
wherein the contact surface is formed in a radius of curvature of 0.1 mm or more.
8. The liquid treatment equipment as set forth in claim 5:
wherein the seal member is provided with a leading path formed over from the inside seal portion to the outside seal portion.
9. The liquid treatment equipment as set forth in claim 5:
wherein the holder is provided with a rear surface cover covering a rear surface of the substrate.
10. The liquid treatment equipment as set forth in claim 5, further comprising:
a suction member disposed to the holder and sucking either one of a gas and bubbles present in the neighborhood of the surface being treated of the substrate.
11. Liquid treatment equipment, comprising:
a treatment solution bath accommodating a treatment solution;
a holder holding a substrate and bringing a surface being treated of the substrate into contact with the treatment solution;
a first electrode disposed in the holder and coming into contact with the surface being treated of the substrate;
a second electrode disposed in the treatment solution bath and applied thereto a voltage between the first electrode; and
a suction member disposed to the holder and sucking either one of a gas and bubbles in the neighborhood of the surface being treated of the substrate.
12. The liquid treatment equipment as set forth in claim 11:
wherein the suction member comprises a venturi tube and a gas supplier for supplying a gas to the venturi tube.
13. The liquid treatment equipment as set forth in claim 12:
wherein the venturi tube is a double venturi tube.
14. A liquid treatment method, comprising:
a step of immersing where a surface being treated of a substrate, directed downward, while sucking a gas in the neighborhood of the surface being treated of the substrate, is brought into contact with a liquid level of a plating solution to immerse in the treatment solution; and
a step of liquid treating where, after immersing the surface being treated of the substrate in the treatment solution, an electric current is sent to the substrate to implement liquid treatment to the surface being treated of the substrate.
15. The liquid treatment method as set forth in claim 14:
wherein the step of immersing is one where the surface being treated of the substrate, after being brought into contact with the liquid level of the treatment solution, while sucking bubbles in the neighborhood of the surface being treated of the substrate, is immersed.
16. A liquid treatment method, comprising:
a step of immersing where a surface being treated of a substrate, directed downward, after being brought into contact with a liquid level of a treatment solution, while sucking a gas in the neighborhood of the surface of the substrate, is immersed in the treatment solution; and
a step of liquid treating where, after immersing the surface being treated of the substrate in the treatment solution, an electric current is sent to the substrate to implement the liquid treatment on the surface being treated of the substrate.
17. A liquid treatment method, comprising:
a step of sucking where with a surface being treated of a substrate directed downward and immersed in a treatment solution, bubbles in the neighborhood of the surface being treated of the substrate are sucked; and
a step of liquid treating where, after sucking the bubbles, an electric current is sent to the substrate to implement liquid treatment on the surface being treated of the substrate.