U.S. patent application number 15/893505 was filed with the patent office on 2018-08-16 for aluminum panels.
The applicant listed for this patent is Multitechnic Limited. Invention is credited to Colin Edge.
Application Number | 20180230617 15/893505 |
Document ID | / |
Family ID | 58461989 |
Filed Date | 2018-08-16 |
United States Patent
Application |
20180230617 |
Kind Code |
A1 |
Edge; Colin |
August 16, 2018 |
ALUMINUM PANELS
Abstract
An aluminum panel comprises an upper surface and a lower surface
and the upper surface comprises at least one recessed area. The
panel has a reduced thickness in the at least one recessed area.
Both the upper surface of the panel and the at least one recessed
area are provided with an aluminum oxide coating and the aluminum
oxide coating of the at least one recessed area includes at least
one colored dye. A method for producing an aluminum panel is also
provided.
Inventors: |
Edge; Colin;
(Northumberland, GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Multitechnic Limited |
Northumberland |
|
GB |
|
|
Family ID: |
58461989 |
Appl. No.: |
15/893505 |
Filed: |
February 9, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C25D 11/12 20130101;
C25D 11/18 20130101; C25D 11/243 20130101; C23F 1/02 20130101; C25D
11/08 20130101; C25D 11/14 20130101; C25D 11/022 20130101; C25D
11/04 20130101; C25D 11/246 20130101 |
International
Class: |
C25D 11/02 20060101
C25D011/02; C25D 11/04 20060101 C25D011/04; C25D 11/24 20060101
C25D011/24; C25D 11/08 20060101 C25D011/08; C25D 11/14 20060101
C25D011/14; C23F 1/02 20060101 C23F001/02; C25D 11/12 20060101
C25D011/12 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 10, 2017 |
GB |
1702213.8 |
Claims
1. An aluminum panel comprising: an upper surface comprising at
least one recessed area; and a lower surface, wherein the panel has
a reduced thickness in the at least one recessed area, wherein both
the upper surface of the panel and the at least one recessed area
are provided with an aluminum oxide coating, and wherein the
aluminum oxide coating of the at least one recessed area includes
at least one colored dye.
2. An aluminum panel according to claim 1, wherein the aluminum
oxide coating of the at least one recessed area is unsealed.
3. An aluminum panel according to claim 1, wherein the aluminum
oxide coating of the at least one recessed area is sealed.
4. An aluminum panel according to claim 1, wherein a depth of the
recessed area is sufficient to be discernible by sight and/or
touch.
5. An aluminum panel according to claim 4, wherein the depth of the
recessed area is at least 0.1 mm relative to the upper surface of
the panel.
6. An aluminum panel according to claim 1, wherein the aluminum
oxide coating is obtained by electrolytic anodizing treatment.
7. An aluminum panel according to claim 6, wherein the electrolytic
anodizing treatment is a sulphuric acid electrolytic anodizing
treatment.
8. An aluminum panel according to claim 1, wherein the aluminum
oxide coating of the upper surface of the panel includes at least
one dye.
9. An aluminum panel according to claim 8, wherein the at least one
dye included in the aluminum oxide coating of the upper surface of
the panel is a different color to the at least one dye included in
the aluminum oxide coating of the recessed area.
10. An aluminum panel according to claim 1 wherein the panel is
selected from the group consisting of: labels, nameplates, signs,
badges, and flooring.
11. A method for producing an aluminum panel comprising the steps
of: (a) taking an aluminum panel, the panel comprising an upper
surface and a lower surface, the upper surface having an aluminum
oxide coating, and removing part of the aluminum oxide coating and
a portion of underlying aluminum of the panel to create a recessed
area on the panel; and (b) connecting the panel to a power supply
and anodizing exposed aluminum parts of the recessed area of the
panel such that the recessed area is provided with an anodized
aluminum oxide coating.
12. A method according to claim 11, further comprising a final step
of: (c) sealing the anodized coating of the recessed area.
13. A method according to claim 12, wherein in step (c) the
anodized coating is sealed using a standard sealing process
selected from the group consisting of: hot water sealing, steam
sealing, nickel salt cold sealing, chromate sealing and dichromate
sealing processes.
14. A method according to claim 12, wherein the sealing process is
a hot water sealing process and the anodized coating is sealed by
immersion in water at a temperature of between 96 and 100.degree.
C., for a period of at least 20 minutes.
15. A method according to claim 11, wherein in step (a) the
aluminum oxide coating on the panel is obtained by electrolytic
anodizing treatment.
16. A method according to claim 15, wherein the electrolytic
anodizing treatment is a sulphuric acid electrolytic anodizing
treatment.
17. A method according to claim 11, comprising an additional step
of applying at least one colored dye to the panel after step
(b).
18. A method according to claim 11, wherein in step (a) the
recessed area of the panel has a depth of at least 0.1 mm relative
to the upper surface of the panel.
19. A method according to claim 11, wherein step (a) is a two-step
process and comprises the steps of first removing the aluminum
oxide coating, and subsequently removing the underlying
aluminum.
20. A method according to claim 11, wherein in step (a) the
aluminum oxide coating is removed by a process selected from the
group consisting of: chemical etching, engraving, laser engraving
and sand blasting.
21. A method according to claim 11, wherein in step (a) the
underlying aluminum is removed by a process selected from the group
consisting of: chemical etching, engraving, laser engraving and
sand blasting.
22. A method according to claim 11, wherein the aluminum panel is
selected from the group consisting of: labels, nameplates, signs,
badges, and flooring.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This applicant claims the foreign priority benefit of
British Application No. 1702213.8 filed Feb. 10, 2017 for
"Aluminium Panels" by C. Edge, which is incorporated by herein by
reference.
TECHNICAL FIELD
[0002] The present disclosure relates to panels made from anodized
aluminum and from anodized aluminum alloys and a method for
producing such panels, and in particular to panels including a
recessed design.
BACKGROUND
[0003] Aluminum signs or nameplates are typically made from
anodized aluminum panels.
[0004] Anodizing is an electrochemical process which provides the
surface of a metal, such as aluminum, with an oxide coating. This
anodized coating is porous and can absorb dyes to provide the panel
with a colored layer. The anodized coating must then be sealed
using a sealing process which seals the pores in the coating.
Anodizing increases corrosion and wear resistance of the panel and
the anodized coating is non-conductive of electricity.
[0005] Sulphuric acid is commonly used in the preparation of
anodized aluminum, producing coatings of moderate thickness, for
example 1.8 .mu.m to 25 .mu.m thick. These coatings are known as
type II coatings.
[0006] Different sealing processes are commonly used, including hot
water sealing where the panel is immersed in boiling de-ionized
water for a certain amount of time, and cold sealing methods, where
for example the panel may be immersed in a solution of a nickel
salt, such as nickel fluoride.
[0007] Pre-anodized aluminum sheets are often used in making signs.
Designs can be engraved or etched into the anodized panels and
paint can be added to the etched or engraved areas. However, since
the paint is applied to the metal surface it is less durable than
dyes encapsulated within the anodic layer and also vulnerable to
both wear and damage and degradation from solvents, pollutants or
the environment.
[0008] Anoprinting is an alternative known method of printing onto
aluminum panels to make signage. This process involves printing
onto a freshly anodized, unsealed, porous surface, allowing the
dyes to soak into the surface. After the color has been applied the
anodized coating is sealed to trap the dye inside the anodized
surface layer. In this process there is no etching and/or engraving
so the surface of the signs is smooth and when a smooth surface is
contaminated with dirt or soot it can be difficult to read. With
signage of this type there is also no option to make the surface of
the signs tactile and it can be difficult to read such signage from
certain angles or in certain light conditions since the reflection
from the surface is uniformly smooth. In addition, if the printed
image becomes bleached for example through exposure to heat or
light the image will be reduced in intensity or lost entirely. This
type of signage is also unsuitable for use on a floor as the smooth
surface is likely to provide a slip hazard, particularly when
wet.
[0009] It would therefore be desirable to provide an improved
aluminum panel.
SUMMARY
[0010] According to an aspect of the present disclosure, there is
provided an aluminum panel or an aluminum alloy panel comprising an
upper surface and a lower surface, the upper surface comprising at
least one recessed area, the panel having a reduced thickness in
the at least one recessed area, wherein both the upper surface of
the panel and the at least one recessed area are provided with an
aluminum oxide coating, and wherein the aluminum oxide coating of
the at least one recessed area includes at least one colored
dye.
[0011] The depth of the recessed area should be sufficient to be
discernible by sight or touch, preferably at least 0.1 mm relative
to the upper surface of the panel.
[0012] Preferably the aluminum oxide coating is obtained by
electrolytic anodizing treatment. More preferably the electrolytic
anodizing treatment is a sulphuric acid electrolytic anodizing
treatment.
[0013] The aluminum oxide coating of the at least one recessed area
may be unsealed. Alternatively, the aluminum oxide coating of the
at least one recessed area may be sealed. Anodized aluminum oxide
coatings are preferably sealed using a standard sealing process
selected from the group comprising: hot water sealing, steam
sealing, nickel salt cold sealing, chromate sealing and dichromate
sealing processes.
[0014] The aluminum oxide coating of the recessed area may include
more than one dye. The aluminum oxide coating of the upper surface
of the panel may include at least one dye. The aluminum oxide
coating of both the upper surface of the panel and the aluminum
oxide coating of the recessed area may each include at least one
dye. The dye included in the aluminum oxide coating of the upper
surface of the panel may be a different color to the dye included
in the aluminum oxide coating of the recessed area.
[0015] The aluminum panel may be selected form the group
comprising: labels, nameplates, signs, badges, and flooring.
[0016] According to a further aspect of the present disclosure
there is provided a method for producing an aluminum panel
comprising the steps of:
[0017] taking an aluminum panel, the panel comprising an upper
surface and a lower surface, the upper surface having an anodized
coating, and removing part of the aluminum oxide coating and a
proportion of the underlying aluminum to create a recessed area on
the panel; and
[0018] connecting the panel to a power supply and anodizing the
exposed aluminum parts of the recessed area of the panel such that
the recessed area is provided with an aluminum oxide coating.
[0019] The method may comprise a final step of:
[0020] (c) sealing the anodized coating of the recessed area.
[0021] Preferably the aluminum oxide coating on the panel in step
(a) is obtained by electrolytic anodizing treatment. More
preferably, the electrolytic anodizing treatment is a sulphuric
acid electrolytic anodizing treatment.
[0022] The method may include an additional step of applying at
least one colored dye to the panel after step (b) and before step
(c).
[0023] Preferably, the recessed area created in step (a) has a
depth of at least 0.1 mm relative to the upper surface of the
panel.
[0024] Step (a) may be a two-step process, and comprises the steps
of first removing the anodized coating, and the subsequently
removing the underlying aluminum. Each step of the two-step process
may use a different removal process.
[0025] In step (a) the anodized coating may be removed by a process
selected from the group comprising: chemical etching, engraving,
laser engraving and sand blasting.
[0026] In step (a) the underlying aluminum may be removed by a
process selected from the group comprising: chemical etching,
engraving, laser engraving and sand blasting.
[0027] Preferably, in step (c) the anodized coating is sealed using
a standard sealing process selected from the group comprising: hot
water sealing, steam sealing, nickel salt cold sealing, chromate
sealing and dichromate sealing processes. Where the sealing process
is a hot water sealing process and the anodized coating is sealed
by immersion in hot water, preferably water at a temperature of
between 96 and 100.degree. C., for a period of at least 20
minutes.
[0028] The aluminum panel used in the method may be selected form
the group comprising: labels, nameplates, signs, badges, and
flooring.
[0029] The term aluminum panel includes panels made from aluminum
or alloys of aluminum.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In the Drawings, which illustrate preferred embodiments of
the present disclosure:
[0031] FIG. 1a is a perspective view of an aluminum panel with an
etching stencil applied;
[0032] FIG. 1b is a cross section of the panel of FIG. 1a, through
the line X-X;
[0033] FIG. 2 is the cross section of FIG. 1b after a first etching
process;
[0034] FIG. 3 is the cross section of FIG. 1b after a second
etching process;
[0035] FIG. 4 illustrates the cross section of FIG. 1b after
re-anodizing the etched areas of the panel;
[0036] FIG. 5 illustrates the panel after immersion in a dye
solution;
[0037] FIG. 6a illustrates a cross section through the panel after
the etching stencil has been removed; and
[0038] FIG. 6b illustrates a perspective view of the panel of FIG.
1a after treatment with the method of the present disclosure.
DETAILED DESCRIPTION
[0039] FIG. 1a illustrates a panel of anodized aluminum 1. A
cut-vinyl etching stencil 3 has been applied to the anodized
surface coating, leaving an area 4 of the surface exposed.
[0040] FIG. 1b illustrates the cross-section taken along the line
X-X. It can be seen in FIG. 1b that the aluminum panel 1 has an
anodized coating 2 at its upper surface. The anodized coating 2 is
a layer of aluminum oxide formed during an electrolytic process
which has been subsequently sealed using a standard sealing
process. The anodized coating 2 may have been immersed in a dye
solution prior to sealing, so may be colored.
[0041] The anodized coating 2 is removed from the exposed area 4 by
applying an etching solution. FIG. 2 shows the anodized coating
removed in the area 4 exposed by the stencil 3, exposing the
underlying aluminum metal 5.
[0042] The panel 1 is then further etched or engraved to increase
the depth of the image area 4 to form a recessed area on the panel
1, as shown in FIG. 3. Any suitable etching or engraving method
which removes material to produce a recessed area may be used.
[0043] The panel 1 is then connected to a power supply and the
exposed aluminum surface 5 is re-anodized using a standard
anodizing method, to produce an anodized coating 6, as shown in
FIG. 4, typically of around 25 .mu.m thickness. Since the original
anodized coating 2 does not conduct electricity it is unaffected by
this second anodizing step.
[0044] At this stage, the freshly anodized coating 6 is porous and
may be dyed by immersing in a dye solution, resulting in a colored
anodized coating 6' as shown in FIG. 5. Since only the freshly
anodized coating 6 is porous it is only this part which absorbs the
dye, meaning that the recessed parts of the panel may be dyed a
different color to the original panel. The panel 1 is then sealed
using standard sealing methods known in the art, such as hot water
sealing or cold sealing methods using Nickel salts for example.
[0045] Lastly, as shown in FIGS. 6a and 6b, the stencil 3 is
removed to reveal a recessed area 4 which has been colored a
different color to original anodized coating 2.
[0046] The application of dye is an optional step and the anodized
coating may be sealed without dyeing to produce a transparent
layer.
[0047] The following example exemplifies the method of the present
disclosure:
Example 1
[0048] A piece of anodized aluminum plate with an anodized coating
of thickness 25 .mu.m had a simple cut-vinyl etching stencil
applied to the anodized surface.
[0049] The anodized coating from the area exposed by the stencil
was then removed by etching in 5% NaOH solution at 20.degree. C.
for about 3 minutes until the aluminum metal surface became
visible.
[0050] The panel was then rinsed in water.
[0051] Using a standard spray etching machine, the panel was then
etched in 20% Ferric Chloride solution at 20.degree. C. for 15
minutes to increase the depth of the area exposed by the
stencil.
[0052] The panel was then rinsed in water.
[0053] The panel was then connected to a power supply and was
anodized in a tank using lead cathodes in a solution of 10% H2SO4
at 20.degree. C. using a current of 0.018 A at 15 v for 50 minutes
to produce an anodized coating of thickness of approximately 25
.mu.m.
[0054] The panel was then removed from the power supply and was
rinsed in de-ionized water.
[0055] The panel was then immersed in a standard black anodizing
dye solution for 20 minutes at 20.degree. C. until the dye had
fully colored the applied anodized parts from step (vi).
[0056] The panel was then rinsed in water.
[0057] The panel was then immersed for 30 minutes in a standard
sealing tank containing water at 97.5.degree. C.
[0058] The stencil was then peeled from the surface and adhesive
residue removed using a proprietary general purpose washing
solvent.
[0059] Masking, or similar techniques may be employed to enable
more than one colored dye to the panel.
[0060] Panels produced using this method include recessed detail or
graphics and are useful as labels, name plates, signs, badges, or
flooring for example. The recessed detail may help to enable
improved tactile discernment of the information or graphics. The
recessed design can also produce different reflective properties
between the upper surface of the panel and the recessed
surface.
* * * * *