U.S. patent application number 14/415036 was filed with the patent office on 2015-07-23 for joint strip consisting of glass fibres.
This patent application is currently assigned to SAINT-GOBAIN ADFORS. The applicant listed for this patent is SAINT-GOBAIN ADFORS. Invention is credited to Bohuslav Mikulecky, Jan Mraz.
Application Number | 20150204077 14/415036 |
Document ID | / |
Family ID | 46826828 |
Filed Date | 2015-07-23 |
United States Patent
Application |
20150204077 |
Kind Code |
A1 |
Mikulecky; Bohuslav ; et
al. |
July 23, 2015 |
JOINT STRIP CONSISTING OF GLASS FIBRES
Abstract
The invention relates to a joint tape, in strip form, formed by
an open-mesh glass fiber warp knit fabric or woven fabric, said
warp knit fabric or woven fabric comprising fibers parallel to the
length of the strip and fibers perpendicular to the length of the
strip, said tape being characterized in that at least one glass
fiber, referred to as reinforcing fiber, parallel to the length of
the strip and located in the central zone thereof, has a linear
density at least five times higher than the linear density of the
other fibers.
Inventors: |
Mikulecky; Bohuslav; (Usti
nad Orlici, CZ) ; Mraz; Jan; (Litomysl, CZ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAINT-GOBAIN ADFORS |
Chambery |
|
FR |
|
|
Assignee: |
SAINT-GOBAIN ADFORS
Chambery
FR
|
Family ID: |
46826828 |
Appl. No.: |
14/415036 |
Filed: |
July 16, 2013 |
PCT Filed: |
July 16, 2013 |
PCT NO: |
PCT/FR2013/051706 |
371 Date: |
January 15, 2015 |
Current U.S.
Class: |
156/71 ; 428/220;
442/1; 442/149; 442/181; 442/187; 442/304; 442/307 |
Current CPC
Class: |
D03D 15/0094 20130101;
D03D 3/005 20130101; D04B 21/10 20130101; Y10T 442/2738 20150401;
Y10T 442/419 20150401; D03D 1/00 20130101; Y10T 442/30 20150401;
D03D 15/0011 20130101; D10B 2505/00 20130101; Y10T 442/10 20150401;
E04F 13/042 20130101; Y10T 442/40 20150401; D10B 2101/06 20130101;
D03D 9/00 20130101; Y10T 442/3049 20150401 |
International
Class: |
E04F 13/04 20060101
E04F013/04; D04B 21/10 20060101 D04B021/10; D03D 1/00 20060101
D03D001/00; D03D 9/00 20060101 D03D009/00; D03D 15/00 20060101
D03D015/00; D03D 3/00 20060101 D03D003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 17, 2012 |
FR |
1256875 |
Claims
1. A joint tape, in strip form, comprising an open-mesh glass fiber
warp knit fabric or woven fabric, wherein the warp knit fabric or
woven fabric comprises a glass fiber parallel to the length of the
strip, referred to as a longitudinal fiber, a glass fiber
perpendicular to the length of the strip, referred to as a
transverse fiber, and a longitudinal fiber located in a central
zone of the strip, referred to as a reinforcing fiber, wherein the
reinforcing fiber, has a linear density at least two times higher
than the linear density of the other longitudinal fibers.
2. The joint tape as claimed in claim 1, wherein the tape comprises
a single reinforcing fiber.
3. The joint tape as claimed in claim 1, wherein the tape comprises
two reinforcing fibers.
4. The joint tape as claimed in claim 1, which has a width of
between 30 mm and 80 mm.
5. The joint tape as claimed in claim 1, wherein the reinforcing
fiber has a linear density of between 30 and 300 dtex.
6. The joint tape as claimed in claim 1, wherein the longitudinal
and transverse glass fibers have a linear density of between 20 and
120 dtex.
7. The joint tape as claimed in claim 1, wherein the open-mesh has
an equivalent diameter of between 2 mm and 7 mm.
8. The joint tape as claimed in claim 1, further comprising, on one
of its faces, a self-adhesive coating.
9. The joint tape as claimed in claim 1, wherein all the glass
fibers are coated with an elastomer coating.
10. A process for jointing two flat construction elements forming,
with respect to one another, an angle of less than 180.degree., the
process comprising applying the joint tape as claimed in claim 1 to
the two flat construction elements, and overlapping both
construction elements so that the reinforcing fiber is superposed
on a join line between the two construction elements.
Description
[0001] The present invention relates to glass fiber joint tapes,
particularly suitable for the jointing of boards in the
corners.
[0002] It is known to use glass fiber meshes as jointing elements
between two plasterboards or between a plasterboard and other
construction elements. These glass meshes are sometimes
self-adhesive. They are put in place and bonded overlapping the
joining zone between two adjacent plasterboards, then are generally
covered with plaster.
[0003] When the plasterboards or construction elements form, with
respect to one another, an angle significantly lower than
180.degree., the easy application of the joint tape requires prior
folding thereof in the length direction. However, the elasticity of
the glass fibers makes folding the tape along the median line
difficult. The tape spontaneously has a tendency to return to its
initial flat form. This tendency could, certainly, be reduced by
using thinner glass fibers, but only at the expense of a reduction
in the mechanical strength properties.
[0004] The idea at the heart of the present invention was to
facilitate the longitudinal folding of a joint tape by "guiding" it
owing to one or more reinforcing fibers, located on the median line
or in the immediate vicinity thereof. These longitudinal,
reinforcing fibers give the tape good rigidity without excessively
weighing down the structure of the tape. The greater rigidity of
the median fiber or of a few median fibers could even enable the
use of thinner glass fibers as peripheral weft yarns and warp yarns
and result overall in lighter joint tapes.
[0005] Patent application US 2007/0199271 describes a joint tape
designed with a pulling means (pull strip), parallel to the
longitudinal edge of the strip and that makes it possible to easily
remove it from its support with a view to recycling the latter.
[0006] This document describes various embodiments of this pulling
means.
[0007] In a first embodiment, represented in FIGS. 2, 3, 3A and 3B
of D1, the pulling means is a strip bonded to the fiber mesh. The
present invention differs from this embodiment by the fact that the
reinforcing fiber is one of the longitudinal fibers of the woven
fabric or knit fabric.
[0008] In a second embodiment, represented in FIGS. 6 and 6A and
described in paragraph [0043], the pulling means may be formed by
the longitudinal fibers themselves. It is indicated that the
longitudinal fibers (630) may have a tensile strength greater than
(FIG. 6) or equal to (FIG. 6A) that of the transverse fibers
(625).
[0009] This joint tape is not however particularly suitable for
being bonded in the corners. Indeed, in the first embodiment, the
pulling means creates a zone of increased rigidity that is
difficult or even impossible to fold. In the second embodiment, all
the fibers have the same thickness and do not enable effective
guiding of the strip in the corner.
[0010] Thus a need remains for a joint tape that is very
particularly suitable for being bonded in the corners.
[0011] Consequently, one subject of the present invention is a
joint tape, in strip form, formed by an open-mesh glass fiber warp
knit fabric or woven fabric, said knit fabric or woven fabric
comprising fibers parallel to the length of the strip (warp fibers)
and fibers perpendicular to the length of the strip (weft fibers),
said tape being characterized in that at least one glass fiber,
referred to as reinforcing fiber, parallel to the length of the
strip and located in the central zone thereof, has a linear density
at least two times higher, preferably from two to ten times higher,
in particular from three to eight times higher than the linear
density of the other warp and weft fibers.
[0012] More particularly, one subject of the present invention is a
joint tape, in strip form, formed by an open-mesh glass fiber warp
knit fabric or woven fabric, said warp knit fabric or woven fabric
being formed by [0013] glass fibers parallel to the length of the
strip, referred to as longitudinal fibers, and [0014] glass fibers
perpendicular to the length of the strip, referred to as transverse
fibers, said tape being characterized in that at least one of the
longitudinal fibers, referred to as reinforcing fiber, located in
the central zone of the strip, has a linear density at least two
times higher than the linear density of the other longitudinal
fibers.
[0015] The glass fibers used in the present invention are formed by
thin individual filaments, generally provided with a size,
assembled into a yarn of greater thickness.
[0016] The textile structures of the present invention do not
encompass non-woven fabrics or weft knit fabrics, but only meshes,
or woven fabrics, and warp knit fabrics, generally bound by a
polymer binder or coating, preventing the glass fibers from sliding
with respect to one another.
[0017] It is possible, in principle, to use any type of glass
fibers, for example fibers made of E, C, R or AR (alkali resistant)
type glass. The expression "glass fibers" used in the present
invention also encompasses rock fibers manufactured from basalt. In
particular, AR glass or E glass is preferred on condition that it
is coated with a polymer coating, for example made of an EVA or SBR
elastomer or made of an acrylic polymer, which protects against the
alkalinity of the cement present in the plaster or mortar.
[0018] In one preferred embodiment of the present invention, all
the glass fibers of the tape are coated with an elastomer.
[0019] The joint tapes of the present invention therefore contain
at least two different types of fibers: [0020] the reinforcing
fiber or fibers, and [0021] the normal, longitudinal or transverse
glass fibers that are thinner than the reinforcing fibers.
[0022] The linear density of the reinforcing fibers is generally
between 30 and 300 dtex, preferably between 60 and 120 dtex.
[0023] The linear density of the other fibers is at least two times
lower than those of the reinforcing fiber or fibers. It is
preferably between 20 and 120 dtex, in particular between 30 and 70
dtex.
[0024] The joint tapes of the present invention generally have a
width of between 30 mm and 80 mm, preferably of between 45 mm and
55 mm. They are produced in the form of an endless strip and are
packaged in rolled-up form.
[0025] The reinforcing fibers, when there are several thereof, are
all found in the median zone of the strip. This median zone extends
over at most 10% of the width of the joint tapes of the present
invention.
[0026] In one embodiment of the present invention, the joint tape
comprises a single continuous reinforcing fiber, preferably located
on the median line of the tape.
[0027] In one particularly advantageous embodiment of the present
invention, the joint tape comprises two reinforcing fibers,
adjacent to one another. The adjective "adjacent" does not mean
here that the two reinforcing fibers are in contact with one
another, but simply means that the two reinforcing fibers are
neighboring, that is to say are not separated by one or more
thinner fibers.
[0028] The normal glass fibers, thinner than the reinforcing
fibers, may all have the same thinness. In another particular
embodiment, the transverse fibers are thinner than the longitudinal
fibers, which facilitates the longitudinal folding of the joint
tapes.
[0029] The joint tapes of the present invention have an open-mesh
structure. The meshes must be large enough to allow the passage of
the plaster or mortar applied to the plasterboards and other
construction elements to be joined. They may be of square shape, in
the case where all the glass fibers are equidistant, or else have a
rectangular shape, in the case, for example, where the weft fibers
are spaced further apart from one another than the warp fibers.
[0030] In order to be free of these shape considerations, the size
of the meshes is expressed in the present invention by means of the
equivalent diameter, which is equal to the diameter of the circle
of the same surface area as the opening in question. Thus, a square
mesh having sides of X cm (surface area of X.sup.2 cm.sup.2) has an
equivalent diameter equal to 2(X.sup.2/.pi.).sup.1/2 cm.
[0031] The mean equivalent diameter of the open meshes of the joint
tapes of the present invention is preferably between 2 mm and 7 mm,
in particular between 3 mm and 6 mm.
[0032] The joint tape preferably comprises, on one of its faces, a
self-adhesive coating, generally a pressure-sensitive adhesive
(PSA) coating.
[0033] For easy application of the tape, the latter must have a
sufficient initial tack in order to adhere by simple
contact/pressure to a clean and dry wall and in order not to become
detached under the effect of its own weight. As is known, this tack
must not however exceed a certain value so that the tape remains
easy to peel and reposition.
[0034] The adjustment of this adhesive strength is part of the
general knowledge of a person skilled in the art who will know how
to choose the nature and the concentrations of the various
ingredients of the pressure-sensitive adhesive (such as the
polymers, the tackifying agent, fillers, etc.) or else the geometry
or the thickness of the PSA layer.
[0035] Pressure-sensitive adhesives that can be used in the present
invention are known. They may be deposited in the form of a liquid
composition based on an organic solvent or on water (latex) or else
they may be thermofusible polymers, that is to say polymers of low
molecular weight that, in the melt state, have a low enough
viscosity to spread out in an appropriate manner.
[0036] The PSAs are generally based on an elastomer resin that may
contain an agent that increases the tack (tackifying agent).
[0037] The polymer resin is conventionally selected from acrylic
resins, butyl rubber, ethylene/vinyl acetate (EVA) copolymers,
natural rubber, vinyl ethers, and styrene-based block copolymers
such as styrene-butadiene-styrene (SBS),
styrene-ethylene/butylene-styrene (SEBS),
styrene-ethylene/propylene (SEP) and styrene-isoprene-styrene (SIS)
copolymers.
[0038] EVA and the styrene-based block copolymers have the
advantage of being thermofusible elastomers and can therefore be
applied in the form of a solvent-free composition.
[0039] As explained in the introduction, the glass fiber strips of
the present invention are used for joining together plasterboards
or for joining plaster boards to other construction elements, in
particular at the corners.
[0040] Consequently, another subject of the present invention is a
process for jointing two flat construction elements forming, with
respect to one another, an angle of less than 180.degree., said
process comprising the application of a joint tape as described
above, overlapping both construction elements so that the
reinforcing fiber is superposed on the join line between the two
construction elements.
[0041] One of the two construction elements is preferably a
plasterboard. Particularly preferably, both construction elements
are plasterboards. The angle that the two construction elements
form is preferably an angle between 60.degree. and 120.degree. , in
particular an angle close to 90.degree..
[0042] After applying the joint tape, the construction elements,
including the joining zone, are generally covered with a uniform
plaster coating.
[0043] FIGS. 1 and 2 represent two embodiments of the joint tape of
the present application.
[0044] More particularly, FIG. 1 shows a portion of a joint tape 1
consisting of longitudinal glass fibers 2, parallel to the length
of the tape, and transverse glass fibers 3 perpendicular to the
length of the tape. The joint tape represented in this figure
comprises nine longitudinal fibers, including one reinforcing fiber
4 thicker than the other eight fibers on either side of this
central fiber. In this embodiment, the joint tape is intended to be
folded so that the reinforcing fiber is in the angle formed by two
plasterboards.
[0045] The joint tape represented in FIG. 2 is identical to that of
FIG. 1 apart from the fact that it comprises not just one but two
neighboring reinforcing fibers 4 having a thickness greater than
that of the other longitudinal fibers. In this embodiment, the
joint tape is intended to be folded between the two reinforcing
fibers.
* * * * *