Note: Descriptions are shown in the official language in which they were submitted.
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Thermally fixable textile fabric
Field of the Invention
The invention relates to a thermally fixable textile
fabric, in particular usable as a fixable inlay fabric,
lining fabric and/or outer fabric in the textile
industry. The textile fabric is distinguished by a very
pleasant surface feel and, at the same time, can be
produced with low thickness and high elasticity. The
invention further relates to the production of the
textile fabric and to its use as an inlay fabric,
lining fabric and/or outer fabric for textiles.
Background of the Invention
Inlay fabrics are the invisible skeleton of clothing.
They ensure a correct fit and optimal wearing comfort.
They aid in processibility, increase the functionality,
and stabilize clothing. Besides clothing, these
functions can find use in technical textile
applications such as, for example, the furniture,
upholstery and home textiles industry.
Lining fabrics are fabrics which are used as lining for
textiles, for instances garments or leather goods. A
lining is defined, in textile engineering, as a textile
fabric that is fastened by sewing, stitching and/or
thermal fixing to the inner sides of textiles. A lining
thus constitutes the inner, body-facing fabric layer of
clothing. Lining can have the function of making the
inner side of a garment more durable, more comfortable
and/or warmer, or, perhaps, more decorative. Moreover,
the clothing lining has in many cases also a
fashionable aspect. Apart from in garments, textile
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lining is also used in hats, cases, handbags and other
containers.
Outer fabrics are fabrics which are used as an
externally visible outer fabric layer of textiles.
Advantageous property profiles for inlay fabrics,
lining fabrics and outer fabrics are, according to
application, softness, resilience, feel, wash
resistance and care durability and/or sufficient wear
resistance during use. The abovementioned materials
generally consist of nonwoven fabrics, woven fabrics,
knitted fabrics, or comparable textile fabrics. In
particular, inlay fabrics are generally provided with
an adhesive substance, whereby the inlay can be bonded
to an outer fabric, generally thermally by heat and/or
pressure (fixing inlay). The inlay is thus laminated
onto an outer fabric. Said various textile fabrics have
different property profiles, according to the
manufacturing process. Woven fabrics consist of
threads/yarns in the warp and weft directions, knitted
fabrics consist of threads/yarns which are connected
via a knit weave to form a textile fabric. Nonwoven
fabrics consist of single fibers, which are laid to
form a fibrous web and which are mechanically,
chemically or thermally bonded.
At present, thin, transparent, flexible or open outer
fabrics, above all in ladies' outer clothing and
sportswear, constitute a trend in the clothing
industry. Fabrics which are very light and open in
their structure are well suited to supporting such
outer fabrics.
If elastic outer fabrics are used or if garments are
intended to be equipped with elastic properties, then
the use of elastic textile fabrics is of advantage.
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US 8323764 B2 describes a stretchable workpiece,
comprising: (a) a porous or microporous woven layer of
partially connected droplets of an elastic elastomeric
material, wherein the layer has an inner and outer
surface; and (b) loose fibers, which are partially
embedded in a surface of the layer. Production is
realized by the use of a former (a special tool or some
other device for the forming of articles or forming
material.
The described workpiece is an elastic material which is
flocked on both sides and exists in flat or 3D form and
the structure of which is defined by the used former.
For its production, a complex process and sophisticated
equipment is necessary, i.e. a specific former must be
used, as well as a special layer on which the flock
fibers are temporarily fixed until the elastomer is
applied. Furthermore, the use of the former is
necessary in order to produce the elastically flocked
surface or coating. In this product, breathability is
achieved by spraying of elastomer droplets, wherein the
interspaces between these droplets serve as pores and
ensure breathability. This means that only a part of
the flock fibers which are fixed on the gel/aqueous
solution remains in the end product, which results in a
higher waste rate. Furthermore, a porosity and
breathability with sprayed elastomer droplets is only
possible if the thickness of this elastomer coating is
very small. This results in a very low mechanical
strength of the material. In addition, in the flocking
of a 3D shape, for example in concave parts, no
uniformly dense flocking can be achieved.
US 9596897 B2 describes a waistband for an article of
clothing, comprising an elastic base layer, an elastic
mounting layer, and a flocking which is applied to the
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surface of the mounting layer. The described waistband
has the following drawbacks: an "elastic adhesive tape"
(mounting layer 40) is used to support the garment in
the waist region (base layer 30), or an elastic knitted
fabric, which is sewn or bonded to the base layer 30
with hot-melt film. It is proposed that an adhesive
layer 50 is connected both to the base layer 30 and to
the mounting layer 40 by pressure (40-60 psi) for 20 to
30 seconds, and heat (150-170 F/66-77 C). With such a
low bonding temperature, it is impossible to iron or
wash the garment, even just at 60 C. It is also
proposed that the band 11 and the base layer 30 are
fastened by seams to the clothing body (18), which
precludes the possibility of fastening the flocked
surface directly to the body of the garment.
US 20090271914 Al describes a garment comprising
support bands which are made of an elastomeric adhesive
and are flocked with one end of the flock fibers which
are embedded in the elastomeric adhesive. Furthermore,
a method for producing garments with flock fibers,
which are produced using electrostatic or mechanical
devices, is described. The main drawback of the method
consists in the fact that the clothing manufacturer
must acquire the necessary technology/equipment and
expertise, for instance in the fields of adhesive
screen printing, adhesive spray guns, application of
the flock material, air purification/filtering, thermal
adhesive drying or curing, in order to be able to
perform a direct flocking of the garments after the
cutting.
It is desirable to at least partially eliminate the
abovementioned drawbacks.
Summary of the Invention
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In one aspect, the present invention provides a
thermally fixable textile fabric, in particular usable
as a fixable inlay fabric, lining fabric and/or outer
fabric in the textile industry, comprising a support
material based on a meltblown fiber nonwoven fabric,
wherein the support material has on one side flock
fibers and, on the side facing away from the flock
fibers, a hot-melt adhesive.
An advantage of the textile fabric according to one
aspect of the invention is that it can be easily
produced in the form of sheeting comprising flock
fibers. In a preferred embodiment of the invention, the
textile fabric is hence configured as sheeting. A
fundamental advantage over clothing which has been
flocked in the ready-made state is that it enables the
clothing manufacturer to use flocked sheeting to create
flocked fiber surfaces on a garment merely by cutting
and fusion, without having to employ sophisticated
flocking technologies.
It is further advantageous that the breathability can
be easily achieved by using different degrees of
density of the meltblown fiber nonwoven fabric. In the
following described flocking process, the adhesive can
then be applied to the meltblown fibers, whereby the
regions between them remain free and can serve as
breathing (air-permeable) pores.
According to the invention, the textile fabric has a
support material based on a meltblown fiber nonwoven
fabric. The term "based (on)" here signifies at least
90% by weight, related to the total weight of the
support material. By the term "meltblown fibers" are
understood, according to the invention, fibers that are
produced by extrusion of a molten thermoplastic
material, through a multiplicity of fine, usually
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circularly configured nozzle capillaries, as molten
fibers into a high-velocity gas (for instance air).
Through this procedure, the diameter of the fibers is
reduced. After this, the meltblown fibers are carried
by high-velocity gas stream and deposited on a
collecting surface in order to form a meltblown fiber
nonwoven fabric from randomly distributed fibers. The
melt-blowing method is well known and described in
various patents and publications, for instance NRL-
Bericht 4364, "Herstellung von superfeinen organischen
Fasern" [NRL Report 4364, "Production of superfine
organic fibers"] by V.A. Wendt, E.L. Boone and C.D.
Fluharty; NRL-Bericht 5265, "Eine verbesserte
Vorrichtung fur die Bildung von superfeinen
Thermoplastic Fibers" [NRL Report 5265 "An improved
device for the formation of superfine thermoplastic
fibers], by K.D. Lawrence, R.T. Lukas, and J.A. Junge:
and US Patent No. 3,849,241, granted on 19th. November
1974 to Buntin, et al.
A further advantage of a meltblown fiber nonwoven
fabric is that, due to the many fine fibers, the
bonding of an adhesive is markedly better than in
conventional nonwoven fabrics.
In a preferred embodiment of the invention, the
meltblown fibers are formed of polymers, selected from
the group consisting of: polyesters, polyolefins,
polyamides, polyacrylates, polyvinyl acetates and
polyurethanes, copolymers and/or mixtures hereof.
Particularly preferred in this context are
polyurethanes, since these have particularly high
elasticity. Likewise preferred are thermoplastic
elastomers, in particular thermoplastic elastomeric
polyesters, polyolef ins and/or polyurethanes.
Thermoplastic elastomers (TPE, occasionally also termed
elastoplasts) are plastics which at room temperature
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behave comparably to the traditional elastomers, yet,
under the supply of heat, are able to be plastically
deformed and thus display thermoplastic behavior.
In another preferred embodiment of the invention, the
meltblown fibers have a fiber linear density of 0.2-5
dtex, preferably of 0.5-3 dtex, in particular of 0.5-2
dtex.
The component of meltblown fibers in the textile fabric
preferably amounts to 10% by weight, yet more
preferredly from 20% by weight to 60% by weight, in
particular from 25% by weight to 55% by weight,
respectively related to the total weight of the textile
fabric.
According to the invention, the support material has on
one side flock fibers. Flock fibers are fibers of small
length, which, in the form of loose fibers, are applied
to a substrate, here the support material. Depending on
fiber thickness and length, a velvety-soft to hard-
abrasive surface can be created in accordance with the
desired function, visual appearance or surface feel.
The flock fibers can be formed of any natural or
synthetic material. Synthetic materials preferably
comprise nylon, polyamide, polyester, for instance
terephthalate polymers, and natural materials such as
cotton, silk, viscose and/or wool.
The length of the flock fibers can be varied according
to requirement. Preferably, the flock fibers have a
length ranging from 0.3 mm to 1.5 mm, more preferably
from 0.4 mm to 0.75 mm, in particular from 0.4 to 0.6
mm.
The linear density of the flock fibers can likewise be
varied according to requirement. Preferably, the flock
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fibers have a linear density ranging from 0.5 dtex to 3
dtex, more preferably from 0.9 dtex to 1.7 dtex, in
particular from 0.9 dtex to 1.3 dtex.
In addition, the flock fibers can be linear or non-
linear. Thus the flock fibers can, for instance, be
rolled, crimped and/or bent. Preferably, the flock
fibers stand substantially perpendicular to the support
material. Alternatively, they can also, however, be
disposed in randomly oriented, angled-off and/or
substantially parallel arrangement. The fibers used for
the flocking can be produced by cutting of filaments to
a desired length. The fiber ends created by the cutting
can be smooth or unsmooth, for instance jagged.
Preferably, the flock fibers are fixed onto the support
material by means of an adhesive. Suitable adhesives
are, for instance, acrylate-based, polyurethane-based,
silicone-based and/or rubber-based adhesives. By the
term "based (on)" should here be understood a component
of at least 50% by weight. According to the invention,
acrylate-based, polyurethane-based and/or silicone-
based adhesives are particularly preferred.
Expediently, the adhesive is a curable adhesive.
In a preferred embodiment, the adhesive has a cross-
linking agent. Preferredly, the adhesive in the textile
fabric is cross-linked by the cross-linking agent. A
preferred cross-linking agent is a "blocked
isocyanate". The term "blocked isocyanate" describes,
in accordance with its conventional meaning, the fact
that the isocyanate, when brought into contact with the
adhesive, exists as an addition compound with a
blocking agent, in particular alcohols (urethanes)
and/or amines (ureas). At higher temperatures, this
addition compound can re-release the isocyanate,
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whereby the cross-linking of the adhesive can be
initiated.
Through the use of the blocked isocyanate, the time of
the cross-linkage can be purposefully set. This can
prevent a cross-linkage from occurring already during
the coating operation, which could lead to
irregularities in the coating. Through the use of a
blocked isocyanate, a tailor-made degree of cross-
linkage can also be set. This results in an improved
quality of the adhesive.
According to the invention, particularly preferred
blocking agents are selected from the group consisting
of 3,5 dimethyl pirazole (DMP), acetoacetic acid,
malonic ester, butanone oxime, secondary amines,
caprolactam, phenols, alcohols and mixtures hereof.
Quite particularly preferred is in this context DMP,
since this gives rise to an excellent cross-linkage of
the polymers, is non-toxic and deblocks already at low
temperatures, around 120 C to 130 C.
The isocyanate can exist in blocked form in one or more
isocyanate groups.
In one embodiment, the adhesive is cross-linked only by
means of isocyanate. It is also conceivable, however,
that the adhesive, alternatively or additionally to the
isocyanate, is cross-linked by means of other cross-
linking agents, for example aziridines,
polyisocyanates, carbodimides, saccharides,
acrylamides, epoxides, amines, oxazolines, urea
derivatives, hydrazines and/or carbonic acid
hydrazides. Preference is for thermally cross-linked
adhesives. These have an advantage over moisture cross-
linked adhesives, since the cross-linkage can be
purposefully controlled.
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In a particularly preferred embodiment, the textile
fabric has a meltblown fiber nonwoven fabric based on
thermoplastic TPU, polyester, polyamide, polyacrylate,
polyvinyl acetate, polyolefins, cotton, wool, viscose,
lyocell in combination with flock fibers based on
polyamide, polyester, polyacrylate, polyvinyl acetate,
polyolefins, cotton, silk, wool and/or viscose, with a
hot-melt adhesive based on polyamide, polyester,
polyolefins, polyacrylates, polyvinyl acetates or
polyurethanes, and with a cross-linked adhesive based
on polyacrylate, polyurethane, polyvinyl acetate,
rubber and/or silicone.
"Based (on)" here respectively means a weight component
of more than 50% by weight.
In order to obtain a good elasticity (elongation) of
the textile fabric, it is of advantage if the elastic
recovery of the adhesive is no less than the elastic
recovery of the support material.
In a preferred embodiment, the textile fabric according
to the invention has an elasticity, measured according
to DIN EN ISO 13934-1 at a force of 3N, in at least one
direction, of at least 2%, for instance of 2% to 50%,
yet more preferredly of 10% to 20%.
In a preferred embodiment, the textile fabric according
to the invention has a permanent elongation, measured
according to DIN 53 835, in at least one direction, of
at least 0.1%, for instance of 2% to 20%, yet more
preferredly of 1% to 5%.
The flock fibers can cover the support material fully
or merely in part. If a merely partial coverage of the
support material obtains, the flock fibers can form a
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regular or an irregular pattern. One advantage of a
merely partial coverage of the support material is that
the air permeability or breathability of the textile
fabric can be easily set. Furthermore, it also enables
a purposeful setting of modulus and elongation
behavior.
In one embodiment of the invention, the textile fabric
has a breathability, measured according to DIN EN ISO
9237 at 100 Pa, of more than 20 1/m2s, for instance of
20 1/m2s to 2000 1/m2s. In other embodiments, it can be
desirable if the breathability is lower, for instance
less than 20 1/m2s, yet more preferredly less than 10
1/m2s, even more preferredly less than 5 1/m2s, and in
particular around 0 1/m2s.
The application of the flock fibers to the support
material can be realized with various methods, for
instance by electrostatic and/or mechanical flocking.
According to the invention, preference is for
electrostatic flocking. This is well known and uses
loose flock fibers, which are applied in an electric
field to the support material coated with an adhesive.
According to the invention, the support material has on
the side facing away from the flock fibers a hot-melt
adhesive. Hot-melt adhesives, also termed hot glues or
hotmelts, have long been known. In general, by these
are understood solvent-free products which are applied
in the molten state to an adhesive surface, rapidly
harden upon cooling, and hence rapidly build up
strength. According to the invention, preferredly
thermoplastic polymers, such as polyamides (PA),
copolyamides, polyesters (PES), copolyesters, ethyl
vinyl acetate (EVA), and copolymers thereof (EVAC),
polyolefins, in particular polyethylene (PE),
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polypropylene (PP), amorphous polyalphaolefins (APAO),
polyurethanes(PU), and mixtures hereof, are used as
hot-melt adhesives. According to the invention, co-
polyamides, co-polyesters and polyurethanes are
particularly preferred.
The adhesive effect of holt-melt adhesives is
essentially based on the fact that they are able to be
reversibly melted and, as liquid melt, due to their
reduced viscosity resulting from the melting operation,
are capable of cross-linking the surface to be bonded
and thereby form an adhesion to this. As a consequence
of the subsequent cooling, the hot-melt adhesive
rehardens to a solid, which solid has a high cohesion
and, in this way, establishes the connection to the
adhesive surface. After the bonding has taken place,
the viscoelastic polymers ensure that the adhesion is
maintained also after the cooling operation, with their
volume changes and the therewith associated build-up of
mechanical stresses. The developed cohesion imparts the
bonding forces between the substrates.
In one embodiment, the hot-melt adhesives are used in
powder form. The size of the particles is oriented to
the area to be printed, for instance to the desired
size of a bond point. In the case of a dot pattern, the
particle diameter can vary between >0 pm and 500 pm. In
principle, the particle size of the hot-melt adhesive
is not uniform, but follows a distribution, i.e. a
range of particle size is always present. Expediently,
the particle size is tailored to the desired
application volume, dot size and dot distribution.
Hot-melt adhesives in powder form can be applied by
means of scattering application, which, in particular,
for the bonding of porous substrates, is expedient for
the production of altogether breathable textile
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composites. A further advantage of scattering
application is that it is a simple application method
for large-scale applications. Since thermoactivated
powders, for instance of polyamides, polyesters or
polyurethanes, are adhesive already at low
temperatures, they are suitable for gentle lamination
of heat-sensitive substrates, for example high-value
textiles. By virtue of good flow characteristics in the
activated state, a good connection is established even
at low pressure and with short pressing time;
nevertheless, the risk of bleeding into the fabric
remains low.
The hot-melt adhesive can also be applied to the
meltblown fiber nonwoven fabric by means of paste
printing, double-dot and hot-metal processes. According
to the invention, the past printing process is
particularly preferred, since feel and elasticity are
hereby maintained particularly well.
Due to the use of a meltblown fiber nonwoven fabric as
the base material, the areal weight of the textile
fabric according to the invention can be set very low.
Areal weights, measured according to DIN EN 29073,
ranging from 10 g/m2 to 400 g/m2, preferably from 25
g/m2 to 200 g/m2, and in particular from 30 g/m2 to 100
g/m2, have proved expedient for many applications.
Further preferably, the textile fabric has a thickness,
according to DIN EN ISO 9073-2, of 0.5 mm to 1.6 mm,
preferably of 0.5 mm to 0.9 mm.
Further preferably, the textile fabric has a modulus,
measured according to DIN 53 835 at an elongation of
25%, of less than 20 N, for instance of 1 N to 20 N,
preferably of 2 N to 10 N. The comparatively low
modulus of the textile fabric is advantageous, since
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the fabric is able to stretch without great application
of force and thus adapts perfectly to the body
contours.
Due to its specific properties, the textile fabric is
eminently suitable as a fixable inlay fabric, lining
fabric and/or outer fabric in the textile industry.
Preferred inlay fabrics for combination with the
meltblown fiber nonwoven fabric according to the
invention are selected from knitted or woven elastic
fabrics, from natural or synthetic yarns, or
combinations hereof. These fabrics can also comprise
highly elastic yarns. Preferred lining fabrics for
combination with the meltblown fiber nonwoven fabric
according to the invention are selected from elastic
real leather of animal origin or artificial leather.
Preferred outer fabrics for combination with the
meltblown fiber nonwoven fabric according to the
invention are selected from laminated nonwoven fabric
or loose membranes.
The invention also relates in one aspect to a method
for producing a thermally fixable textile fabric
according to the invention, comprising the following
steps:
A) provision of a support material based on a
meltblown fiber nonwoven fabric;
B) application of flock fibers to one side of the
support material;
C) application of a hot-melt adhesive to that side of
the support material that is facing away from the flock
fibers.
One advantage of the method according to the invention
is that the meltblown fiber nonwoven fabric can be
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flocked in the unformed, i.e. flat state. The maximum
flock fiber density can hereby be achieved.
The provision of the support material in step A) can be
realized by meltblowing of a nonwoven fabric raw
material, preferably polyurethane. In a preferred
embodiment, the support material is formed on an
auxiliary support, for instance a spunbond nonwoven
fabric, whereby a higher stability and easier
reprocessibility is conferred to it. Preferably, the
provision of the support material consequently
comprises the fixing thereof on an auxiliary support.
In one embodiment of the invention, the application of
flock fibers to one side of the support material is
subsequently realized in step B). Preferably, the
application of the flock fibers comprises the upstream
step of applying an adhesive.
According to the invention, electrostatic flocking is
preferred. The flock fibers are here applied in an
electric field to the adhesive-coated support material.
If an auxiliary support is used, then adhesive and
flock fibers are applied to that side of the support
material that is facing away from the auxiliary
support. The application of the adhesive can be
realized by screen printing, spray gun or immersion
bath. The surface of the support material is preferably
smooth or only very slightly embossed or grooved. The
field lines ensure that the flock fibers orient
themselves at a desired angle, preferably vertically,
and thus create an even, textile surface. Subsequently,
the adhesive can be cured and the flocking anchored.
Excess and unbonded flock fibers can be removed by
vacuum.
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Likewise conceivable is a mechanical flocking for
fastening of the flock fibers. For this, the support
material provided with the adhesive can be guided over
a series of, preferably polygonal, rollers, which
quickly set said support material into vibrations. This
vibration can propel the flock fibers into the
adhesive.
Following the flocking, the auxiliary support, where
used, can be removed and, after this, a hot-melt
adhesive can be applied to that side of the support
material that is facing away from the flock fibers
(method step C). The hot-melt adhesive can be applied
to the meltblown fiber nonwoven fabric by means of
paste printing, double-dot, scattering and hotmelt
methods. According to the invention, the paste printing
method is particularly preferred.
In an alternative embodiment of the invention, method
step C) is performed prior to method step B).
The invention consequently relates to a method for
producing a thermally fixable textile fabric,
comprising the following steps:
A') provision of a support material based on a
meltblown fiber nonwoven fabric;
B') application of a hot-melt adhesive to one side of
the support material;
C') application of flock fibers to that side of the
support material that is facing away from the hot-melt
adhesive.
In a preferred embodiment, the support material is
formed on an auxiliary support, for instance a spunbond
nonwoven fabric. If an auxiliary support is used, then
the hot-melt adhesive is applied to that side of the
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support material that is facing away from the auxiliary
support, and said support material is removed again
prior to the application of the flock fibers.
In this method variant too, the application of the
flock fibers preferably comprises the upstream step of
applying an adhesive.
Brief Description of the Figures
Figure 1: textile fabric having a full-face flock fiber
coating,
Figure 2: textile fabric having a patterned flock fiber
coating,
Figure 3: photo of the surface of a textile fabric
having a patterned flock fiber coating.
Detailed Description
Figure 1 shows a thermally fixable textile fabric 1
according to the invention, having a full-surface flock
fiber coating. The textile fabric comprises a support
material 2 based on a meltblown fiber nonwoven fabric,
wherein the support material 2 has on one side flock
fibers 3 applied over the whole of the surface and, on
that side facing away from the flock fibers 3, a hot-
melt adhesive 4. The flock fibers 3 are here fixed on
the support material 2 by means of an adhesive 5.
Figure 2 shows a thermally fixable textile fabric 1
according to the invention, having a patterned flock
fiber coating. The textile fabric comprises a support
material 2 based on a meltblown fiber nonwoven fabric,
wherein the support material 2 has on one side flock
fibers 3 applied in the form of a pattern and, on the
side facing away from the flock fibers 3, a hot-melt
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adhesive 4. The flock fibers 3 are here fixed on the
support material 2 by means of an adhesive 5.
Figure 3 shows a photo of the surface of a textile
fabric 1 having a patterned flock fiber coating.
Examples
Various textile fabrics in accordance with the invention
have been made. For this purpose, a support material
based on a meltblown fiber nonwoven fabric, comprising a
thermoplastic polyurethane having a weight of 75 g/m2 was
provided. The support material was produced by means of
meltblown technology, and flock fibers (PA6.6, length
0.4mm; linear density (yarn count) 0.9 dtex) were applied
on one side of the support material. The flock fibers
were fixed by means of various adhesives to the support
material. Various adhesives, as shown in the following
table, were used. Subsequently, a hot melt adhesive based
on copolyamide, in the form of an aqueous dispersion, was
applied to the side of the support material opposite from
the side having the flock fibres, by means of a rotary
screen printing process.
The following table shows the properties of the obtained
textile fabrics:
Table 1
Permanent
Example Adhesive Elasticity Elongation Wash Resistance
Result
1 Type 1 goodt
2 Type 2 ** ** good
3 Type3.1 ** *** ** very good
4 Type 3.2 *** ** *** vesygimd
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Explanation of Table 1
1. Adhesive
Type 1: Water-based acrylate system without crosslinker
Type 2: Water-based acrylate system with blocked
isocyanate crosslinker (requires a de-blocking
temperature of >140 C)
Type 3.1: Acrylate-based water-based system with HDI
(hexamethylene
diisocyante)-trimer-isocyanate
crosslinker (requires a de-blocking temperature of
<120 C)
Type 3.2: water-based PU-System with crosslinker
(requires a de-blocking temperature of <120 C)
2. Elasticity
Elasticity was measured according to DIN EN IS013934-
1:2013. The values obtained are as follows:
25% elongation at a tensile force of 15 N to 20 N
** 25% elongation at a tensile force of 10 N to 15 N
*** 25% elongation at a tensile force of less than 10 N
3. Permanent elongation
The permanent elongation was measured according to DIN
53835. The values obtained are as follows:
permanent elongation <3%
** permanent elongation 3-4%
*** permanent elongation 5%
4. Wash resistance
The wash resistance was measured according to DIN EN ISO
6330:2012. The values obtained are as follows:
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* weight loss after 10 washes = 6-7 wt.%
** weight loss after 10 washes = 3-5 wt.%
*** weight loss after 10 washes = less than 3 wt.%
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