[0001] The present invention relates to a method for manufacturing a wall of a household
appliance, in particular of a cooking appliance, more in particular of a cooking hob
according to the preamble of claim 1. The present invention further relates to a household
appliance according to the preamble of claim 9.
[0002] Currently, in the manufacturing process of household appliances comprising metallic
sheets or walls which, besides mechanical functionality, also have an aesthetic appearance
and which are treated by their users by touching, such metallic sheets or walls are
equipped with a self-cleaning and/or an easy-to-clean and/or a hydrophobic characteristic
as well as with specific printing for applying product name and/or symbols for a user
interface. Different approaches are known for performing blank metal sheets or walls
with such characteristic. One approach provides a functional coating which results
in said self-cleaning and/or an easy-to-clean and/or a hydrophobic characteristic
and which is applied on the sheet or wall after forming, i. e. after a stamping or
embossment step. In an alternative solution, the functional coating may be applied
to the blank metal sheet prior to any treatment step like stamping or embossment.
This alternative solution allows a significant cost advantage over the first approach,
due to simplified logistics in terms of transportation costs and component codes fragmentation.
On the other hand, this alternative solution may result in corrosion problems on the
metal sheet, even in case of using stainless steel material, when the functional coating
is removed for applying the printing on the wall. Alternatively, in case of not removing
the coating, the printing may be non-durable due to lack of adhesion of the printing
material. Further, the aesthetical appearance may suffer from the printing on the
coating and/or the surface may lose its self-cleaning or easy-to-clean effect.
[0003] It is an object of the present invention to provide a method for manufacturing a
wall of a household appliance as well as a household appliance which overcomes the
above-described disadvantages.
[0004] The object is achieved for a method for manufacturing a wall of a household appliance
according to the preamble of claim 1 by the features of the characterizing part of
claim 1.
[0005] A method for manufacturing a wall of a household appliance, in particular of a cooking
appliance, more in particular of a cooking hob, the wall having a base structure or
base layer and a surface, in particular an outer surface, is provided. The surface
receives or has received a self-cleaning and/or an easy-to-clean and/or a hydrophobic
characteristic. According to the present invention, at least one printing is applied
to the surface, the printing material not touching the base structure or base layer.
By applying at least one printing or printing material to the surface, which does
not touch the base structure or base layer, a surface with slightly aesthetical appearance
and continuous self-cleaning and/or easy-to-clean and/or hydrophobic effect or characteristic
is provided.
[0006] The base structure or base layer is preferably a metal sheet, particularly a stainless
steel sheet. The self-cleaning and/or easy-to-clean and/or hydrophobic characteristic
may be generated on blank sheet material.
[0007] In a specific arrangement, the self-cleaning and/or easy-to-clean and/or hydrophobic
effect or characteristic is received by means of a self-cleaning coating and/or an
easy-to-clean coating and/or a hydrophobic coating which is applied to the surface.
[0008] The printing material may be applied to an exposed surface of the self-cleaning coating
and/or of the easy-to-clean coating and/or of the hydrophobic coating. Said exposed
surface may be arranged at the coating opposite to the boundary surface adjacent the
base structure or base layer.
[0009] In a preferred embodiment, an activation process is performed on the self-cleaning
coating and/or the easy-to-clean coating and/or the hydrophobic coating prior to applying
the printing material. The activation process preferably increases the surface tension.
[0010] A preferred embodiment is characterized by an activation process which is performed
using plasma technology. Particularly, a plasma technology gun or pin is used, moving
on or above the area to be treated and performing the activation process passing over
said area.
[0011] In order to perform a quick and cost-efficient treatment, the activation process
may be performed by limiting to the area or areas receiving a printing. Hence, areas
without any printing may be excluded from such treatment. In order to reach this target,
blank or non-printed areas may be covered by means of respective cover elements or
cover means. Alternatively, the plasma technology gun or pin may be deactivated when
passing over the blank or non-printed areas.
[0012] In particular, the printing is based on ink application technology, preferably using
serigraphy or tampography.
[0013] The object is achieved for a household appliance according to the preamble of claim
9 by the features of the characterizing part of claim 9.
[0014] A household appliance, in particular a cooking appliance, more in particular a cooking
hob, is provided which has a wall with a base structure or base layer and a surface,
particularly an outer surface. The surface has a self-cleaning and/or an easy-to-clean
and/or a hydrophobic characteristic. According to the invention, at least one printing
is arranged at the surface and the printing material does not touch the base structure
or base layer.
[0015] The base structure or base layer may be a metal sheet, preferably a stainless steel
sheet.
[0016] Preferably, the self-cleaning and/or the easy-to-clean and/or the hydrophobic characteristic
is not interrupted or disrupted at the area or areas with printing.
[0017] According to an embodiment, a self-cleaning coating and/or an easy-to-clean coating
and/or a hydrophobic coating is arranged between the base structure or base layer
and the printing material.
[0018] A preferred embodiment is characterized by a printing which is based on ink application
technology, preferably applied by means of serigraphy or tampography.
[0019] Novel and inventive features of the present invention are set forth in the appended
claims.
[0020] The present invention will be described in further detail with reference to the drawings,
in which
- FIG 1
- is a sectional view of a small section of a wall of a household appliance before receiving
any printing;
- FIG 2
- illustrates a first disadvantageous solution for printing on the wall section of FIG
1;
- FIG 3
- illustrates a second disadvantageous solution for printing on the wall section of
FIG 1;
- FIG 4
- illustrates a first, and preparative, step of the inventive solution for printing
on the wall section of FIG 1; and
- FIG 5
- illustrates a second, and final, step of the inventive solution for printing on the
wall section of FIG 1.
[0021] FIG 1 illustrates a sectional view on a small section of a wall of a household appliance.
By way of example, the small section represent a cutout of a user interface area arranged
on a worktop of a cooking hob which may be a conventional electric hob or a gas hob.
The wall or worktop is made of a metal sheet 1 which is formed out of a flat metal
plate material, e. g. a stainless steel plate, by stamping and embossing. Its outer
or upper surface, which is facing the user and which is exposed to the user's touching,
is covered, at least in the area of a user interface of the household appliance, with
a coating 3, which has a self-cleaning and/or an easy-to-clean and/or a hydrophobic
characteristic or effect in order to meet the user's desire for a low-maintenance
appliance.
[0022] Mainly for the purpose of applying a product name on the household appliance and/or
symbols on a user interface thereof, a printing 5 is arranged on the wall. The printing
is realized with a traditional ink application technology, in particular by means
of serigraphy or tampography.
[0023] The printing 5 may be applied on the outer surface 7 of the coating 3 as illustrated
with FIG 2. Such solution, however, is unfavourable with respect to a durability of
the printing since the printing 5 is lacking adhesion of the ink due to the hydrophobic
behaviour of the coated surface 7 when using traditional serigraphy or tampography.
[0024] In order to overcome the afore-described lack of adhesion, an alternative solution
is illustrated with FIG 3. This alternative solution is characterized by a removal
of the coating 3 in the area of printing 5. The coating removing process is usually
executed by means of laser technology. A laser beam 9 cuts out the area where the
printing 5 shall be placed prior to the application of ink for performing the printing
process. The coating 3 is removed completely down to the upper or outer surface 11
of the blank metal sheet 1. The metal sheet surface 11 is suitable for enabling a
durable printing thereon. This solution, however, is more expensive than the solution
according to FIG 2. Moreover, due to the laser-supported removal of the coating 3,
corrosion may occur later on due to lack of a corrosion protection effect by the coating
3.
[0025] The problems occurring with the solutions according to FIGs 2 and 3 are solved with
a two-step printing process.
[0026] The manufacturing of a wall of a household appliance, e. g. of a worktop of a cooking
hob, is started with a blank metal sheet 1, in particular a stainless steel plate,
on which a self-cleaning and/or an easy-to-clean and/or a hydrophobic coating 3 is
applied. This allows a faster and more effective application. A user interface application
is performed in a second step, after stamping the wall or worktop. The user interface
application is realized with a well-known ink application process based on serigraphy
or tampography, however, according to the invention, by means of a two-step application
process.
[0027] A first step thereof is illustrated with FIG 4. In order to cause the ink to adhere
to the coated surface, a preliminary activation process is performed on the user interface
area using a plasma technology pin or gun which moves on the selected area 13 to be
treated. The process increases locally the surface tension and the activation lasts
for some days, allowing a convenient application of symbols, marking or lettering
with traditional ink technologies.
[0028] Said ink application step, the second printing step, is shown with FIG 5. According
to a printing pattern, ink 5 is applied on the destined area. As illustrated, the
respective surface, i. e. the selected area 13, is prepared for a durable reception
of the printing ink 5, which preparation has been performed with the first step, as
described above. The preparation resulted in the provision of the selected area 13
or receiving area which may protrude the area for the printing 5, as can be seen in
FIG 5.
[0029] Although an illustrative embodiment of the present invention has been described herein
with reference to the accompanying drawing, it is to be understood that the present
invention is not limited to that precise embodiment, and that various other changes
and modifications may be affected therein by one skilled in the art without departing
from the scope or spirit of the invention. All such changes and modifications are
intended to be included within the scope of the invention as defined by the appended
claims.
List of reference numerals
[0030]
- 1
- metal sheet
- 3
- coating
- 5
- printing / ink
- 7
- outer surface of coating
- 9
- laser beam
- 11
- metal sheet surface
- 13
- selected area
1. A method for manufacturing a wall of a household appliance, in particular of a cooking
appliance, more in particular of a cooking hob, the wall having a base structure or
base layer (1) and a surface, in particular an outer surface, the surface receiving
or having received a self-cleaning and/or an easy-to-clean and/or a hydrophobic characteristic,
characterized in that at least one printing (5) is applied on the surface, the printing material (5) not
touching the base structure or base layer (1).
2. The method according to claim 1, characterized in that the base structure or base layer (1) is a metal sheet, preferably a stainless steel
sheet, wherein the self-cleaning and/or easy-to-clean and/or hydrophobic characteristic
is generated on blank sheet material.
3. The method according to claim 1 or 2, characterized in that a self-cleaning coating and/or an easy-to-clean coating and/or a hydrophobic coating
(3) is applied to the surface (11).
4. The method according to claim 3, characterized in that the printing material (5) is applied to an exposed surface (7) of the self-cleaning
coating and/or of the easy-to-clean coating and/or of the hydrophobic coating (3),
which surface (7) is opposite to the boundary surface adjacent the base structure
or base layer (1).
5. The method according to anyone of the preceding claims, characterized in that an activation process is performed on the self-cleaning coating and/or the easy-to-clean
coating and/or the hydrophobic coating (3) prior to applying the printing material
(5), the activation process preferably increasing the surface tension.
6. The method according to claim 5, characterized in that the activation process is performed using plasma technology, in particular by means
of a plasma technology gun or pin moving on or above the area (13) to be treated.
7. The method according to claim 5 or 6, characterized in that the activation process is performed by limiting to the area (13) or areas receiving
a printing (5), in particular covering blank or non-printed areas by means of respective
cover elements or cover means.
8. The method according to anyone of the preceding claims, characterized in that the printing is based on ink application technology, preferably using serigraphy
or tampography.
9. A household appliance, in particular a cooking appliance, more in particular a cooking
hob, having a wall with a base structure or base layer (1) and a surface, particularly
an outer surface, the surface having a self-cleaning and/or an easy-to-clean and/or
a hydrophobic characteristic, characterized in that at least one printing (5) is arranged at the surface, the printing material (5) not
touching the base structure or base layer (1).
10. The household appliance according to claim 9, characterized in that the base structure or base layer (1) is a metal sheet, preferably a stainless steel
sheet.
11. The household appliance according to claim 9 or 10, characterized in that the self-cleaning and/or the easy-to-clean and/or the hydrophobic characteristic
is not interrupted or disrupted at the area or areas with printing (5) .
12. The household appliance according to anyone of the claims 9 to 11, characterized in that a self-cleaning coating and/or an easy-to-clean coating and/or a hydrophobic coating
(3) is arranged between the base structure or base layer (1) and the printing material
(5).
13. The household appliance according to anyone of the claims 9 to 12, characterized in that the printing (5) is based on ink application technology, preferably applied by means
of serigraphy or tampography.