NZ742654A - Process for obtaining a cloth with high performances for digital printing and relative cloth - Google Patents
Process for obtaining a cloth with high performances for digital printing and relative clothInfo
- Publication number
- NZ742654A NZ742654A NZ742654A NZ74265416A NZ742654A NZ 742654 A NZ742654 A NZ 742654A NZ 742654 A NZ742654 A NZ 742654A NZ 74265416 A NZ74265416 A NZ 74265416A NZ 742654 A NZ742654 A NZ 742654A
- Authority
- NZ
- New Zealand
- Prior art keywords
- cloth
- paste
- fabric
- cps
- layer
- Prior art date
Links
- 239000004744 fabric Substances 0.000 title claims abstract description 116
- 238000007639 printing Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 229920000742 Cotton Polymers 0.000 claims abstract description 18
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 229920000297 Rayon Polymers 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 8
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 8
- 239000002562 thickening agent Substances 0.000 claims abstract description 7
- 238000003490 calendering Methods 0.000 claims abstract description 5
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 5
- 229920002635 polyurethane Polymers 0.000 claims abstract description 5
- 239000004814 polyurethane Substances 0.000 claims abstract description 5
- 238000004513 sizing Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 230000003287 optical Effects 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims abstract description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 14
- 229940097275 Indigo Drugs 0.000 claims description 8
- 235000000177 Indigofera tinctoria Nutrition 0.000 claims description 8
- 239000003086 colorant Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 229960003563 Calcium Carbonate Drugs 0.000 claims description 2
- 241000845082 Panama Species 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 229910052570 clay Inorganic materials 0.000 claims description 2
- 239000000049 pigment Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 238000004073 vulcanization Methods 0.000 claims description 2
- 240000007871 Indigofera tinctoria Species 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 239000010457 zeolite Substances 0.000 claims 1
- 238000009990 desizing Methods 0.000 abstract description 3
- 239000000976 ink Substances 0.000 description 15
- 239000010410 layer Substances 0.000 description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 9
- 241001062009 Indigofera Species 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000007645 offset printing Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- PZZYQPZGQPZBDN-UHFFFAOYSA-N Aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 2
- 235000019749 Dry matter Nutrition 0.000 description 2
- 238000007754 air knife coating Methods 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 235000015108 pies Nutrition 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000003625 Acrocomia mexicana Nutrition 0.000 description 1
- 244000202285 Acrocomia mexicana Species 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 230000000996 additive Effects 0.000 description 1
- 230000003254 anti-foaming Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 229940099112 cornstarch Drugs 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- -1 hydroxyethyl propyl Chemical group 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Abstract
description is given of a process for preparing cloths for bookbinding with gloss or matt finish, in cotton or viscose, suitable for being printed by digital printing, said process comprising the steps of A) preparing an unfinished cloth for bookbinding by desizing, washing, treating with optical white, sizing and drying; B) pre-treating the cloth obtained from step A) by applying, on at least one of the two sides, at least one composition for the closure of the pores of said cloth so as to make the surface planar; C) on the side of said fabric or said cloth intended to be printed, applying by coating a layer of a paste having a viscosity of at least 7500 cps, preferably comprised between 8000 and 12000 cps, and drying this layer; said paste being the mixture of at least one aqueous composition containing a 35% (dry) acrylic resin and components that at temperatures of around 200°C for less than one minute initiate the state of polymerization, and of at least one nonionic thickener, preferably of the polyurethane type; and D) calendering at ambient temperature the cloth obtained from step C). white, sizing and drying; B) pre-treating the cloth obtained from step A) by applying, on at least one of the two sides, at least one composition for the closure of the pores of said cloth so as to make the surface planar; C) on the side of said fabric or said cloth intended to be printed, applying by coating a layer of a paste having a viscosity of at least 7500 cps, preferably comprised between 8000 and 12000 cps, and drying this layer; said paste being the mixture of at least one aqueous composition containing a 35% (dry) acrylic resin and components that at temperatures of around 200°C for less than one minute initiate the state of polymerization, and of at least one nonionic thickener, preferably of the polyurethane type; and D) calendering at ambient temperature the cloth obtained from step C).
Description
PROCESS FOR OBTAINING A CLOTH WITH HIGH PERFORMANCES FOR
L PRINTING AND RELATIVE CLOTH
DESCRIPTION
The present invention relates to a fabric in natural, artificial or synthetic fibre, preferably a
cioth in cotton or viscose, cally suitable for being printed ly by digital
ng, preferably HP INDIGO digital printers for paper and labeis/packaging in plastic,
and to the process for obtaining this fabric or cloth.
More particularly the present invention relates to a cloth, as defined above, appropriately
pie-treated and then coated on the obverse side with a particular layer deriving from a
specific mixture comprising an acrylic resin, said layer being highly receptive to the liquid
ink of digital printers and able to confer to the print a high, if not improved, degree of
tion and reproduction of photos or artistic representations, vividness of the colours
and ness of the print comparable to those ed with digital printing on paper.
Even more particularly the present invention relates to a cloth as defined above having
also high printability (evaluated in terms of machinability, brightness of the print,
adherence of the inks) on digital machines of different technology.
Cloths for bookbinding and/or printing are widely used as substrate on which to print,
with various methods of printing, photos or ic representations.
The printing method most used on cloths for bookbinding has always been that of offset
printing (indirect printing which uses dies and cylinders) but recently the practice has
become very widespread of printing said cloths with the digital printing technique in that
extremely fast and versatile, with the ility of producing also a single piece at iow
costs.
l printing on cloth requires the preparation of the cloth in such a way as to create a
base rate) which can retain, without smudges, the inks of digital printers, which
generally are liquid and different from the inks used in offset printing.
In fact, since the liquid inks of digital printers do not adhere very well either to fabrics or
to paper, these substrates must be treated before printing with appropriate products,
generally referred to by the name of “primers”, to make sure that the adhesion of the inks
to the chosen substrate improves.
The digitaily printable cloths currently available on the market, aithough having a good
degree of resolution and y of the printed image, do not succeed however in
providing prints of comparable quality to digital prints on paper, in terms of reproduction
and in particular as regards the vividness of the colours.
Moreover very often these ble cloths can show unwanted cracks in the print of the
image (the phenomenon of cracking) which are an indication of imperfections in the layer
of preparation, i.e. the fabric or the compound coated on top are not of ent quality.
The need is therefore strongly felt to have available a fabric in natural, artificial or
synthetic fibre for direct digital ng, in particular a cloth in cotton or viscose, capable
i5 of reaching a degree of reproduction and resolution of the printed image much more
similar to that of digital prints on paper, in particular as regards the vividness of the
s and the brightness of the print, as well as the lack of white dots due to the lack of
cover of the primer.
The object of the present invention is therefore that of overcoming, at least in part, the
disadvantages of the prior art by providing a fabric or cloth for direct digital printing, in
particular for HP INDIGO digitai printing, able to t a high, if not improved, degree
of reproduction and resolution of the image much more similar to that of digital prints on
paper, in particular as regards the vividness of the colours and the brightness of the print.
r object is that of providing a fabric or a cloth as defined above which has high
printabiiity (evaluated in terms of machinability, ness of print, adherence of the
inks) on l machines of different technology.
A further object is that of providing such a fabric or a cloth which can be made with a
simple, easy and economical s.
These objects are achieved by the fabric or by the cloth treated and prepared in accordance
with the invention having the features listed in the appended independent claim 1.
Advantageous embodiments of the ion are disclosed by the dependent claims.
3 2016/082328
An object of the present invention relates to the use as final coating or finishing of a fabric
for digital printing with HP INDIGO printers, preferably a cloth for bookbinding, of a
particular paste for coating having a ity of at least 7500 cps, preferably comprised
between 8000 and 12000 cps, even more preferably around 10000
cps,
wherein said paste is formed by a mixture comprising
- an aqueous composition ning about 35% by weight (dry) of an acrylic resin
and components that at atures around 200°C for less than one minute initiate the
state of polymerization, and
- a ic thickener, preferably of the polyurethane type,
and optional additives such as for example the anti—foaming agents of the non—silicone and
non—mineral type le for coating pastes.
It has been found that with the abovementioned values of viscosity the paste has such a
tency as to he spreadable on the fabric so as to form a homogeneous layer of
material. This viscosity is therefore to be understood as measured at the ambient g
temperature when the paste is applied, which may vary generally between 10°C and 30°C.
The abovementioned paste for coating is not a colorant paste for fibres nor a paste
containing any type of inorganic/organic pigment such as for example calcium carbonate,
clay, e, silica.
The aqueous composition with acrylic base of the abovementioned paste is ant to
high ature and veiy sensitive to external conditions in that capable of drying easily,
in the pie—emulsion state: said solution contains in fact components which at temperatures
around 200°C for less than one minute trigger the state of polymerization and/or
vulcanization so as to allow the solidification of the paste applied as finai finishing so as
to form a layer receptive to the inks of digital printers, in particular those of HP INDIGO
digital printers.
Said paste, which has a viscosity of at least 7500 cps, is deposited with the air knife
coating technology, applying it on the side of said fabric which is intended to be printed,
said fabric or cloth having been previously pie-treated appropriately by means of the use
of one or more specific compositions for the covering of spaces existing between
warp
and weft (pores).
Cloths for bookbinding are generally lightweight cloths having a unit weight comprised
between 100 and 300 g/m2.
More particularly said cloths for bookbinding are in Panama cotton (100%), ise
ed to as canvas, which generally have a plain weave with a weave repeat preferably
of 26/12 threads per cmz.
Said cloths for bookbinding can also be in viscose (100%) with a plain weave having a
weave repeat preferably of 295/235 threads per call.
The paste and the composition with acrylic base which form the object of the present
invention have been found to be, in combination with the specific compositions of pore
covering, capable of making the cloth surface very receptive to the specific inks of digital
rs, in particular to the inks of HP INDIGO digital printers for paper and
labels/packaging in c, without creating smudges of the ink, improving the quality of
the definition of the digital print on said cloth thanks to the high, if not even improved,
degree of reproduction and resolution of the image much more similar to that of digital
prints on paper, in particular as regards the vividness of the colours and the ness of
the print.
In fact the t finishing paste has been found to be particularly suitable for conferring,
if not even improving, the adhesion of the digital inks on cloth.
This finishing paste, which hereinafter we will also refer to as finishing, is generally
formed by an aqueous composition containing acrylic resin at approximately 35% by
weight (dry) and by a nonionic thickener, preferably of the polyurethane type (for example
i RH 8, nonionic thickener in aqueous base), the latter being added to the s
ition in such quantities as to reach a Viscosity of at least 7500 cps, preferably
comprised between 8000 and 12000 cps: in this way it is possible to reach a deposited
weight, defined as dry weight (in grams) per square metre, of approximately 14 g/m2
which has been found to be suitable for obtaining a surface suitable for being printed by
digital printing.
The nonionic thickener is used here in quantities of around 5% by weight, even if
quantities of around 1% may be sufficient for reaching the abovementioned viscosity.
The application of this finishing composition on a fabric or a cloth for bookbinding,
previously pre—treated, takes place by means of coating, ably by means of an air
knife (scraper) which regulates the thickness of the layer of paste applied while the
surplus is removed by a powerful jet of air.
This coating technique tees the formation of a surface layer of material (e.g. dry)
which is uniform in terms of quantity and spread over the entire height of the cloth.
For simplicity of description the tenns ”, “cloth for bookbinding” will be used here
below to identify also a fabric in natural, artificial or synthetic fibre, without thereby
departing from the scope of the present invention.
As already ned, before being coated with the finishing paste indicated above, the
unfinished cloths for bookbinding have to be appropriately prepared and then pre—treated
ES in order to obtain a e suitable for ing the finishing indicated above, so as to
transform the original unfinished cloth into a cloth ready for use for direct digital printing.
The phase of preparation of said unfinished cloth, here below also denoted as step A),
starts with subjecting the unfinished cloth to desizing to remove the impurities and to
subsequent washing.
Desizing is a finishing operation, typical for cloths composed of cotton yarns or in any
case of cellulose fibres, having the purpose of eliminating, by means of treatment in hot
water and with the aid of appropriate chemical products ing agents), the sizing
residues distributed during preparation for weaving.
Subsequently the desized and washed cloths are treated with optical white in dyeworks in
order to even out the degree of white, in that cotton has ent shades of white — yellow
according to the time and area of harvesting. Subsequently the desized cloths are sized
and dried to eliminate the dyeing water.
When the fabrics are in natural and/or artificial fibres this step of ation A)
contributes to a considerable extent to ring to the digital print a high degree of
resolution and reproduction of the printed image, vividness of the colours and brightness
of the print.
After the step of preparation A) of the unfinished cloth, the cloth ed from step A) is
subjected to a step B) of eatrnent which consists in the closure of the pores of the
cloth by means of the application of an appropriate composition on:
— at least the e side of the cloth for a gloss finish, or on
— both sides, reverse and obverse, of the cloth for a matt finish,
as will be described in detail here below.
The term “reverse” here is intended to identify the side of the cloth not intended to be
printed while the term “obverse “ here is intended to identify the side of the cloth intended
£0 to be printed.
Independently of the type of gloss or matt finish, the step B) of closure of the pores has
essentially the purpose of filling the spaces existing between the warp and weft threads,
thus making the surface of the cloth more planar and uniform.
Subsequently to step B) of pre—treatment, there is then step C) of finishing of the obverse
of said cloth by means of coating of the abovementioned ng paste containing the
aqueous composition with acrylic base, subsequent drying and optionally coupling with
paper as will be described in detail here below.
This finishing paste is preferably obtained from an aqueous composition with acrylic base
and low ity such as for example the commercial primer Digiprirne 1500
(Michehnan) which is however conventionally used as is in the preparation of the paper.
In the present invention at least the ner indicated above is instead added to this
primer, in such a quantity as to reach the abovementioned viscosity of at least 7500 cps,
preferably comprised between 8000 and 12000 cps, and an anti-foaming additive of the
non—silicone and non-mineral type suitable for pastes for coating.
As mentioned, the present step C) of coating is advantageously performed with air knife,
even if this is not binding for the purpose of the t invention since other coating
s known in the art can be used without thereby departing from the sphere of the
present invention.
Going into detail concerning the step of preparation B) by means of closure of the pores,
as already ned, at least one of the two sides of the cloth is treated with a closure
paste, preferably the reverse side in the case of cloths in cotton and preferably the obverse
side in the case of cloths in viscose.
This paste for e of the pores is in general different according to whether the cloth is
in cotton or viscose, and in the case of cloth in cotton it is different also according to
whether the cloth is intended to have a gloss/bright effect (indicated here for simplicity
also as BHPI) or a matt effect (indicated here for simplicity also as MattHPI).
In the case of cotton cioth intended to give a bright effect, indicated here as BHPI, the first
thing that is carried out (first phase) is closure of the pores on the reverse side, preferably
£0 using a paste having a totai dry matter t of about 23% by weight and a viscosity of
about 50000 cps, said paste containing combinations of acrylic , kaolin and vinyl
resin, in addition to an appropriate filler.
The ation of this pores closure paste takes place by means of an air knife coating
technique, ng a quantity of product such as to obtain preferably a unit weight of
approximately 20 g/m2.
After which there is then step C) of application, on the obverse of the BHPI cloth, of the
acrylic composition of coating of the invention, applying a quantity of product such as to
obtain preferably a unit weight equal to 14 g/m2.
Subsequently, and before moving on to ering, the reverse of the BHPI cloth, treated
in this way with the paste of the abovementioned acrylic composition, is bonded with
paper, generally 30 gsm, in a laminating machine, using a glue bath, preferably composed
of two acrylic resins of different rigidity and a cornstarch ve as filler.
In the case of cotton cloth intended to have a matt effect, hereinafter denoted as MattHPI,
the first thing carried out (first phase) is the closure of the pores of the reverse side using a
paste used for passport cloths: said paste contains about 23% of dry matter and comprises
hydroxyethyl propyl cellulose, acrylic resin, kaolin, vinyl resin, applying a quantity of
paste such as to obtain a unit weight ably equal to approximately 24 g/m2.
Subsequently (second phase), this pores closure paste is applied also on the obverse of the
MattHPI cloth by coating, in a quantity such as to obtain ably a unit weight of
approximately 24 g/m2.
The obverse side of said IPI cloth obtained in this way is then subjected (third
phase) to the application of a primer normally used for offset printing, which is formed by
a composition of about 38% by weight of thy matter having a viscosity of 6000 cps.
This primer for offset printing is applied, by means of coating, both in order to make the
surface of the cloth plane, and to avoid possible future interactions between the e of
the cloth and the finishing paste of the invention deriving from the aqueous ition
with acrylic base.
At this point there is then step C) of application, on the obverse of the MattHPl matt cloth,
of the abovementioned finishing paste of the invention for coating deriving from the
c composition defined above.
In the case of viscose cloth a phase of closure (first phase) is carried out only the obverse
E5 with a paste identical to that used for the cloth with MattHPI matt effect, then proceeding
with step C) of application of the abovementioned finishing paste ng from the
c composition defined above.
Subsequently, and before moving on to calendering, the viscose cloth is also bonded to
paper in a laminating machine, similarly to the BHPi cotton cloth, yet using 40 gsm paper,
rather than 30 gsm, using the same glue bath for rd coating glue indicated above for
the BHPI cotton cloth with bright effect.
The ant has unexpectedly found that the application by spreading (coating) of a
layer of the present paste (finishing) of the acrylic composition d above on a fabric
in natural, artificial or synthetic fibre, preferably a cloth in cotton or Viscose, usly
prepared in accordance with what is described above for step B), means that the
performances of the printing machine are good, such as for example machinability
(defined as feature of the substrate of traversing the machine and its cylinders without
oing particular dimensional variations, and without jamming or blocking the
machine itself, within the sphere of well-defined thicknesses and weights and with
adequate hygrometric conditions): t wanting to be bound to any theory it is
presumable that the greater weight and the type of paste (finishing) coated improve
appreciably the machinabiiity of the substrate with respect to standard cloths.
Moreover the cloth treated in this way has been found to be printable also on digital
machines of different technology, ably printing machines that use the HP INDIGO
technology.
Once the coating paste (finishing) of the invention has been applied, and optionally
bonded with paper (step C)), the cotton or viscose cloth is then calendered at ambient
temperature to ensure shine and an even flattening along the surface.
After ering the cloth is sent to the control station and subsequently to the station for
cutting into sheets and to the speculum (the cloth is made to slide over a speculum to seek
and identify possible defects).
A further object of the present invention relates to a method for producing digitally
printed images on a fabric in natural, artificial or synthetic fibre, comprising:
the obtaining of a fabric in natural, artificial or synthetic fibre, as defined
usly, forming a layer receptive to the ink of digital printers;
the application of one 01' more inks of digital printers on the receptive layer
receiving the ink of said fabric to form a digitally printed image so as to be printed
ly with digital printing, in particular HP INDIGO digital printing.
Further features of the invention will be made clearer by the following detailed
description, referred to one of its purely non—limiting es, illustrated in the
accompanying drawings in which:
Figure l is a schematic drawing of a line of coating of a cloth for bookbinding.
The plant of the coating line, which is a phase provided by the present process, was
denoted in Figure 1 l with the reference numeral 100, n the tion
sequence goes from right to left starting from the top right.
Said plant 100 is formed by a series of units, each one having its own c function,
3O starting with an unrolling unit 1, also defined as unwinder assembly, which has the
purpose of unwinding the roll of unfinished cloth for bookbinding 2, in cotton or viscose,
which has already been subjected to the initial step A) of ation.
The hed cloth 2 is made to pass in a series of rollers 3 which also have the purpose
of tensioning the cloth 2 in View of the coating section 10.
W0 2017/114738 10
The coating section 10 is composed of at least one scraper 4 with relative container for the
pouring of one of the pastes indicated above for the pores closure of step B) or of actual
coating of step C),
Below said scraper 4 a cooler cylinder 5 is placed, designed to cool the coated cloth, and
optionally a further cooler cylinder 6.
There is preferably t a second scraper 4’ and relative cooling roller 5’ in order to
increase the quantity of product applied to the cloth and at the same time avoid surface
irregularities.
Subsequently the cloth coated on the surface with the paste of chosen composition is
made to pass on a conveyor beit 7 formed by a pin chain 8 ed to restrain the coated
cloth against the belt 7, avoiding movements of the cloth during its transport which could
crack the layer of product applied usly.
Above said pin chain 8 one or more side brushes 9 are moreover provided, designed to
restrain the sides of the coated cloth against the or belt, avoiding possible
transverse movements of the coated cloth.
The conveyor belt 7 has the e of transferring the coated cloth inside a drying oven
necessary for the drying of the finishing layer d. Said drying oven 30 can reach
high temperatures, also around 200°C, and can also be used to dry, if necessary, the pastes
for the covering of the holes of step B).
At the exit of the conveyor belt 7 there is present an extractor roller ll ed to tension
the coated cloth in order to send it to the subsequent transport rollers assembly 12 which
also provides a cooler roller 13.
At the exit of this transport roliers assembly 12 the following are provided in sequence:
— a cutter assembly 14 designed to cut the selvedge so as to finish the sides of the
coated cloth,
- a metres counter assembly 15,
— a ty reading head 16 for measuring the humidity of the coated cloth,
— a winder assembly 17 for g into a roll the coated cloth ready to be subjected
to an optional subsequent treatment of coating B) and/or C).
W0 2017/114738 11
It should be noted that this plant of the coating line 100 is used preferably for
every phase
of coating provided in the steps B) and/or C) of the present process, even if this is not
binding for the purpose of the present ion so that the same number of coating units
as the number of coating steps ed by the present process could be provided.
The present invention is not d to the particular embodiments described previously
and illustrated in the accompanying drawings, but instead numerous detail changes
be made thereto Within the reach of the person skilled in the art, without thereby departing
from the scope of the same invention, as defined in the appended claims.
Claims (2)
1. Process for preparing a fabric in natural, artificial or tic fibre, preferably natural and/or artificial fibre, more preferably a cotton or viscose cloth for bookbinding, with bright or matt finish, suitable for being printed directly by digital printing, preferably HP INDIGO digital printing, said process comprising the steps of A) preparing an hed fabric or a cloth for bookbinding by ng, washing, treating with optical white, sizing and drying; B) pre-treating the fabric or the cloth obtained from step A) by applying, on at 10 least one of the two sides, at least one ition in the form of a first paste for the closure of the pores of said cloth/fabric so as to make the surface planar; C) on the side of said fabric or cloth ed to be printed, ng by coating a layer of a second paste having a viscosity of at least 7500 cps, preferably comprised between 8000 and 12000 cps, and drying this layer to obtain a layer highly receptive to 15 the liquid ink of digital printers; said viscosity being measured at the ambient working temperature when the paste is applied, generally between 10°C and 30°C, said second paste being a mixture consisting of - at least one nonionic thickener, preferably of the polyurethane type, and 20 - at least one aqueous composition containing about 35% by weight as dry weight of an acrylic resin and components that at temperatures around 200°C for less than one minute initiate the state of polymerization/vulcanization, and - optional additives; said second paste not containing colorant for fibres and inorganic/organic pigment 25 such as for e calcium carbonate, clay, zeolite, silica; and D) calendering at ambient temperature the cloth obtained from step C).
2. Process ing to claim 1, wherein the cloth for bookbinding is a Panama cotton (100%), with a plain weave and having, preferably, a weave repeat of
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IT102015000089200 | 2015-12-30 |
Publications (1)
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NZ742654A true NZ742654A (en) |
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