U.S. patent application number 10/615206 was filed with the patent office on 2004-01-08 for redetachable, self-adhesive device.
This patent application is currently assigned to tesa AG. Invention is credited to Junghans, Andreas, Luhmann, Bernd, Raadts, Thomas.
Application Number | 20040005427 10/615206 |
Document ID | / |
Family ID | 7805460 |
Filed Date | 2004-01-08 |
United States Patent
Application |
20040005427 |
Kind Code |
A1 |
Luhmann, Bernd ; et
al. |
January 8, 2004 |
Redetachable, self-adhesive device
Abstract
Redetachable, self-adhesive device having a plate, the sides
and/or front side of which have fastening means, if appropriate,
and the rear side of which has a strip of an adhesive film which is
adhesive on both sides and is adhesively attached in such a way
that one end of the adhesive film protrudes beyond the plate as a
grip, the adhesive film being of such a kind that the adhesive bond
achieved with it can be released again by pulling in the direction
of the bonding plane, stretching the strip, characterized in that
the rear side of the plate (1) has laterally alongside the
adhesively attached adhesive film (5) spacers (3A, 3B), the height
of which is less than the thickness of the adhesive film (5).
Inventors: |
Luhmann, Bernd;
(Norderstedt, DE) ; Junghans, Andreas; (Hamburg,
DE) ; Raadts, Thomas; (Norderstedt, DE) |
Correspondence
Address: |
Norris, McLaughlin & Marcus P.A.
30th Floor
220 East 42th Street
New York
NY
10017
US
|
Assignee: |
tesa AG
Hamburg
DE
|
Family ID: |
7805460 |
Appl. No.: |
10/615206 |
Filed: |
July 8, 2003 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
10615206 |
Jul 8, 2003 |
|
|
|
09249710 |
Feb 12, 1999 |
|
|
|
09249710 |
Feb 12, 1999 |
|
|
|
08924788 |
Sep 5, 1997 |
|
|
|
5928747 |
|
|
|
|
Current U.S.
Class: |
428/40.1 ;
428/99 |
Current CPC
Class: |
C09J 7/22 20180101; Y10T
428/1486 20150115; Y10T 428/24008 20150115; Y10T 428/24793
20150115; Y10T 428/24777 20150115; Y10T 428/1405 20150115; Y10T
428/24017 20150115; Y10T 428/24174 20150115; C09J 2301/302
20200801; C09J 2301/122 20200801; Y10T 156/1168 20150115; Y10T
428/1452 20150115; A47G 1/175 20130101; C09J 2301/308 20200801;
Y10T 428/14 20150115; Y10T 428/1476 20150115 |
Class at
Publication: |
428/40.1 ;
428/99 |
International
Class: |
B32B 009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 13, 1996 |
DE |
196 37 223.2 |
Claims
1. Redetachable, self-adhesive device having a plate, the sides
and/or front side of which have fastening means, if appropriate,
and the rear side of which has a strip of an adhesive film which is
adhesive on both sides and is adhesively attached in such a way
that one end of the adhesive film protrudes beyond the plate as a
grip, the adhesive film being of such a kind that the adhesive bond
achieved with it can be released again by pulling in the direction
of the bonding plane, stretching the strip, characterized in that
the rear side of the plate (1) has laterally alongside the
adhesively attached adhesive film (5) spacers (3A, 3B), the height
of which is less than the thickness of the adhesive film (5).
2. Device according to claim 1, characterized in that the spacers
(3A, 3B) are located on both sides alongside the adhesively
attached adhesive film (5).
3. Device according to claim 1, characterized in that the spacers
(3A, 3B) are formed as fillets or segments.
4. Device according to claim 1, characterized in that the spacers
(3A, 3B) are arranged on both sides and, on each of these sides, at
least in the region of the two ends.
5. Device according to claim 1, characterized in that it is formed
as an injection-moulded part of plastic.
6. Device according to claim 1, characterized in that the height of
the spacers (3A, 3B) is 35-90% of the thickness of the adhesive
film (5), in particular is 0.3-0.6 mm with a thickness of the
adhesive film (5) of 0.65 mm.
7. Device according to claim 1, characterized in that the adhesive
film (5), with or without an intermediate substrate, is elastically
or plastically extensible.
8. D vice according to claim 1, characterized in that the adhesion
of the adhesive film (5) is less than the cohesion, the
adhesiveness is to a great extent dissipated when the film is
extended, and the ratio of pulling-off force to tearing load is at
least 1:1.5, the adhesive film being of the kind which is based on
thermoplastic rubber and tackifying resins, with high elasticity
and low plasticity.
9. Device according to claim 1, characterized in that the rear side
of the adhesive film (5) is covered with a release laminate, such
as a siliconized release paper or a release film.
10. Device according to claim 1, characterized in that at the sides
of the plate (1) there are engagement devices (4) into which a
corresponding hook or the like can be engaged.
11. Device according to claim 1, characterized in that a spacer is
arranged at one of the end faces on the rear side of the plate (1)
alongside the adhesively attached adhesive film (5).
12. Use of a plate for a device according to one of claims 1-11,
for self-adhesive fastening and easy, residue-free redetachment.
Description
[0001] The invention relates to a redetachable, self-adhesive
device which can be released again from its adhesive bond without
leaving any residue by pulling on the adhesive film, arranged on
it, in the direction of the bonding plane. In particular, the
invention relates to a plate of this type, on which other things
can be fastened if appropriate, or which itself is designed as a
hook or the like if appropriate.
[0002] Such devices, in particular hooks, are known. For instance,
DE 42 33 872 C2 describes a redetachable, self-adhesive hook which
is equipped with an adhesive film which can be adhesively released
by pulling and which is commercially available as "tesa.RTM.
Power-Strips with Hooks". A so-called system hook with base plate
and attachable decorative hook is also commercially available as
the tesa.RTM. Power Strip System Hook.
[0003] WO 94/21157 also discloses such a hook, which differs from
the abovementioned hook in particular by the use of an adhesive
film of the kind which is highly extensible and at the same time
does not recover its original form.
[0004] In the practical use of such devices, problems may occur,
however, in particular during later detachment.
[0005] What is particularly disadvantageous about the previously
known problem solutions is that the releasing of the adhesive bond
has to take place by pulling the adhesive strips substantially in
the bonding plane, errors in use being inevitable for the
unexperienced us r.
[0006] In many cases it has been found that tears are caused by the
user exerting considerable force to press the item to be released
against the object to which it is adhesively bonded during the
releasing process. As a result, the force necessary for pulling the
adhesive tape out of the adhesive joint is increased to such an
extent that the tearing resistance is exceeded, with the
unfortunate consequence for the user that the adhesiv tape tears
and the adhesive bond can no longer be released non-destructively
and without leaving any residue.
[0007] The object of the invention was to overcome the
aforementioned disadvantages.
[0008] This object is achieved by means of a device such as that
characterized in more detail in the claims. Accordingly, the
invention relates to:
[0009] A redetachable, self-adhesive device having a plate, the
sides and/or front side of which have fastening means, if
appropriate, and the rear side of which has a strip of an adhesive
film which is adhesive on both sides and is adhesively attached in
such a way that one end of the adhesive film protrudes beyond the
plate as a grip, the adhesive film being of such a kind that the
adhesive bond achieved with it can be released again by pulling in
the direction of the bonding plane, stretching the strip,
characterized in that the rear side of the plate (1) has laterally
alongside the adhesively attached adhesive film (5) spacers (3A,
3B), the height of which is less than the thickness of the adhesive
film (5).
[0010] In particular a device according to claim 1, characterized
in that the spacers (3A, 3B) are located on both sides alongside
the adhesively attached adhesive film (5).
[0011] In particular a device according to claim 1, characterized
in that the spacers (3A, 3B) are formed as fillets or segments.
[0012] In particular a device according to claim 1, characterized
in that the spacers (3A, 3B) are arranged on both sides and, on
each of these sides, at least in the region of the two ends.
[0013] In particular a device according to claim 1, characterized
in that it is formed as an injection-moulded part of plastic.
[0014] In particular a device according to claim 1, characterized
in that the height of the spacers (3A, 3B) is 35-90% of the
thickness of the adhesive film (5), in particular is 0.3-0.6 mm in
the case of a thickness of the adhesive film (5) of 0.65 mm.
[0015] In particular a device according to claim 1, characterized
in that the adhesive film (5), with or without an intermediate
substrate, is elastically or plastically extensible.
[0016] In particular a device according to claim 1, characterized
in that the adhesion of the adhesive film (5) is less than the
cohesion, the adhesiveness is dissipated to a great extent when the
film is extended, and the ratio of pulling-off force to tearing
load is at least 1:1.5, the adhesive film being of the kind which
is based on thermoplastic rubber and tackifying resins, with high
elasticity and low plasticity.
[0017] In particular a device according to claim 1, characterized
in that the rear side of the adhesive film (5) is covered with a
release laminate, such as a siliconized release paper or a release
film.
[0018] In particular a device according to claim 1, characterized
in that at the sides of the plate (1) there are engaging devices
(4) into which a corresponding hook or the like can be engaged.
[0019] The height of the spacers is advantageously chosen such that
it is less than the thickness of the (unstretched) adhesive film,
so that a satisfactory adhesive bond with the adherent surface is
possible. The extension of the adhesive film occurring during the
detachment operation causes the said film to be reduced
correspondingly in width and thickness. If the thickness of the
adhesive film reached during detachment is less than the height of
the spacers, detachment of the adhesive film without tearing is
even possible if high contact pressures occur at the same time
vertically to the adhesive bond, which would otherwise have lead to
tearing of the adhesive tape.
[0020] According to the invention, suitable in particular as
adhesive films are those corresponding to DE 33 31 016, DE 42 22
849, DE 42 33 872, WO 92/11333 and WO 94/21157.
[0021] For instance, DE 33 31 016 A1 describes an adhesive film for
re-releasable adhesive bonds which allows an adhesive bond
established therewith to be released by pulling on the adhesive
film in the direction of the bonding plane. With such adhesive
films, high adhesive forces and shear strengths can be achieved and
adhesive bonds can be released again without further aids, in a way
comparable to the opening of a preserving jar, similar to the way
in which there the rubber seal is pulled by the grip out of the
seal joint.
[0022] DE 42 22 849 C1 describes such an adhesive film with a
UV-impermeable grip.
[0023] Wo 92/11333 also describes, inter alia, adhesive films for
corresponding applications, the adhesive films used having a low
elasticity with at the same time high extension.
[0024] Double-sided self-adhesive tapes with a foam intermediate
substrate, for example of polyethylene foam, can also be used
according to the invention.
[0025] In general, for production, processing and handling of the
particularly preferred adhesive films, reference is made to DE 33
31 016, DE 42 22 849 and WO 92/11333.
[0026] Suitable as the material for the plate or moulding, in
particular for base plates, are:
[0027] Plastic, metal, wood (coated, for example painted, and
uncoated), ceramic and the like.
[0028] Devices according to the invention serve for receiving one
side of the adhesive film, the other side of which is adhesively
bonded onto the selected underlying surface. A wide variety of
adapters, including hook bodies, can be placed onto the device or
plate. To produce a high bonding strength, the surface of the plate
on the side to which the adhesive film is applied consists in
particular of a material which has an adhesion with respect to the
adhesive film which is adequate for the respective application.
When using contact adhesives based on styrene block copolymers or
acrylate copolymers, advantageously used in this case are, inter
alia, polystyrene, impact-modified polystyrenes, PMMA, aromatic
polyesters, polycarbonate or polyamide.
[0029] To accomplish a pulling-off behaviour without tearing, even
under the effect of high forces acting perpendicularly with respect
to the bonding plane (for example caused by high contact pressure
when releasing the adhesive bond), the plate is equipped with
spacers (for example fillets), as still to be described in detail,
on the side which bears the adhesive film.
[0030] Spacers may be provided on both sides alongside the adhesive
film over the entire length of the base plate, or else only in
certain subregions thereof. Specific formations, right-angled
fillet-like, rounded-off fillet-like, punctiform etc., are
possible.
[0031] Tests with different redetachable adhesive films show that,
depending on the type and structure of the adhesive films used,
typical stripping extensions lie between 100% and 800%. In
practice, it is found that, in the case of substantially
rubber-elastic adhesive films, the height of the spacers should be
at least about 0.05 mm, preferably 0.10 mm, higher than the
thickness of the stretched adhesive films during the detachment
process. For a reliable adhesive bond, on the other hand, the
spacer height should be kept about 0.05 mm, preferably 0.1 mm,
particularly preferably 0.15 mm, less than the thickness of the
adhesive films in the non-stretched state. The values specified
relate to planar, solid adherent surfaces. In the case of rough
and/or slightly deformable adherent surfaces, values higher than
those quoted may be advisabl both for a satisfactory bonding
process (ad quate contact pressure) and for satisfactory
redetachment.
[0032] The invention is to be explained in more detail below with
reference to exemplary embodiments, without however wishing to
restrict it unnecessarily. In the drawing:
[0033] FIG. 1 shows an obliquely lateral view of a device according
to the invention,
[0034] FIG. 2 shows a side view according to FIG. 1, with an
adhesively attached adhesive film strip,
[0035] FIG. 3 shows an end view according to FIG. 1,
[0036] FIG. 4 shows a side view according to FIG. 2, the device
being adhesively attached by its adhesive film strip to an object,
and
[0037] FIG. 5 shows an end view according to FIG. 4.
[0038] To be specific, FIG. 1 shows a plate 1 with a rear side 2,
which serves for receiving a strip of double-sided adhesive film
and has spacers 3A, 3B in the form of fillets to the sides of the
adhesive film to be adhesively attached. On its sides, the plate 1
also has engaging devices 4, into which a corresponding device can
engage, for instance a plate with a hook or some other fastening
device, as is standard and commercially available.
[0039] FIG. 2 shows how a strip 5 of an adhesive film is adhesively
attached to the plate 1, it being indicated by the dotted line 6
how the spacers 3A and 3B partially enclose the strip 5 to the
sides, while one end of the adhesive film protrudes beyond the
plate 1 as a grip 7. In FIG. 3, as an end view of the plate 1, the
latter is represented with the spacers 3A, 3B and also with the
engaging devices 4.
[0040] FIG. 4 shows in a lateral view how such a device is
adhesively attached to an object 8, for instance a wall, a door or
a cupboard, with plate 1, strip 5 of an adhesive film, the grip 7
protruding beyond one end of the plate 1, the grip 7 being made
non-adhesive by thin films 9A, 9B. In FIG. 5, this arrangement is
represented in an end view, with plate 1, strip 5 of an adhesive
strip, and also spacers 3A, 3B which laterally enclose the strip 5
and extend to about half the thickness of the strip 5.
EXAMPLE
[0041] For a single-layer adhesive film of the following
formulation:
[0042] 50 parts of Foralyn 110 (Hercules), 50 parts of Vector 4211
(Exxon Chemical), 0.5 parts of Irganox 1010 (Ciba)
[0043] of a thickness of 650 .mu.m, a maximum tensile force of 52
N/cm, corresponding to 8.0 MPa, and an ultimate elongation of 1300%
are determined.
[0044] Rectangular pieces of the adhesive film measuring 20
mm.times.50 mm are adhesively bonded centrally to base plates
consisting of steel of the dimensions 3 mm.times.40 mm.times.22 mm
(height.times.length.times.width) in such a way that the base
plates are covered on one side over their entire length by the
adhesive film and a 10 mm long strip of adhesive film protrudes
beyond one of the short sides of the base plate, which can be used
as a grip for later detachment. The base plates are provided on
both longitudinal edges on the side to which the adhesive films are
applied with spacers 0.5 mm wide and of different heights. The base
plates provided with adhesive films are adhesively bonded onto a
planar underlying surface of Resopal. For this purpose, the base
plates provided with the adhesive films are applied flatly to the
underlying Resopal surface and pressed onto it with 500 N for 5
seconds. In a second operation, for detaching the adhesive films,
the test pieces fixed in this way are subjected to a force of
likewise 500 N, acting vertically onto the bonding plane, and then
the adhesive film strip is pulled out of the adhesive joint at an
angle of <10.degree. with respect to the bonding plane. For
comparison, the tests are carried out without any force acting
vertically on the bonding plane. The stripping rate in all the
tests is about 1000 mm/min. The following results are obtained.
1 Vertical pressing Without vertical Height of the spacers force
500 N force No spacer Strip tears Can be detached without tearing
0.3 mmn Can be detached Can be detached without tearing without
tearing Stripping force* 10//14 N/cm 0.4 mm Can be detached Can be
detached without tearing without tearing Stripping force* 9//15
N/cm 0.5 mm Can be detached Can be detached without tearing without
tearing Stripping force* 9//10 N/cm 0.6 mm Can be detached Can be
detached without tearing without tearing Stripping force* 9//10
N/cm 0.7 mm No adhesive No adhesive bonding possible bonding
possible *Mean value//maximum value (the maximum value is reached
at the end of the stripping operation).
[0045] Under the chosen test conditions, only base plates provided
with spacers can be detached again without tearing under the effect
of high vertical forces acting on the base plate.
* * * * *