U.S. patent application number 16/699342 was filed with the patent office on 2020-06-04 for air spinning method for the production of large yarns with count lower than ne20 and relative yarn.
The applicant listed for this patent is SAVIO MACCHINE TESSILI S.p.A.. Invention is credited to Fabio D'AGNOLO, Luca DEOTTO.
Application Number | 20200173062 16/699342 |
Document ID | / |
Family ID | 65767192 |
Filed Date | 2020-06-04 |
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United States Patent
Application |
20200173062 |
Kind Code |
A1 |
D'AGNOLO; Fabio ; et
al. |
June 4, 2020 |
AIR SPINNING METHOD FOR THE PRODUCTION OF LARGE YARNS WITH COUNT
LOWER THAN NE20 AND RELATIVE YARN
Abstract
An air spinning method comprising the steps of: preparing at
least one web of textile fibers (N1), to be fed by at least one
introducer element (24) upstream of an air spinning device (28),
drawing said at least one web (N1) with at least one drawing device
(32), feeding said web (N1), previously drawn, in a spinning
chamber (36) of the air spinning device (28), spinning the fibers
(12) inside the spinning chamber (36) by means of compressed air
jets, so as to: obtaining a yarn (4) comprising internal fibers
(20) surrounded by external fibers (16), wherein the yarn (4) has
an overall thread count lower than Ne20 and wherein the total
number of internal (20) and external (16) fibers is less than
200.
Inventors: |
D'AGNOLO; Fabio; (PORDENONE,
IT) ; DEOTTO; Luca; (PORDENONE, IT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAVIO MACCHINE TESSILI S.p.A. |
Pordenone |
|
IT |
|
|
Family ID: |
65767192 |
Appl. No.: |
16/699342 |
Filed: |
November 29, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D01H 1/11 20130101; D02G
1/168 20130101; D02G 3/00 20130101; D02G 3/36 20130101 |
International
Class: |
D02G 1/16 20060101
D02G001/16; D02G 3/36 20060101 D02G003/36 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 3, 2018 |
IT |
102018000010751 |
Claims
1. Air spinning method comprising the steps of: preparing at least
one web of textile fibres, to be fed by at least one introducer
element upstream of an air spinning device, drawing said at least
one web with at least one drawing device, feeding said web,
previously drawn, in a spinning chamber of the air spinning device,
spinning the fibres inside the spinning chamber by means of
compressed air jets, so as to: obtain a yarn comprising internal
fibres surrounded by external fibres, wherein the yarn has an
overall thread count not exceeding Ne20 and wherein the total
number of internal and external fibres is less than 200.
2. An air spinning method according to claim 1, wherein said
overall thread count is greater than or equal to Ne10.
3. An air spinning method according to claim 1, wherein the method
comprises the step of increasing the average cross-section or
diameter of the fibres of the yarn gradually as the yarn count of
the yarn to be produced decreases, so as to maintain the total
number of internal and external fibres below 200.
4. An air spinning method according to claim 2, wherein the method
comprises the step of increasing the average cross-section or
diameter of the fibres of the yarn gradually as the yarn count of
the yarn to be produced decreases, so as to maintain the total
number of internal and external fibres below 200.
5. Air spinning method according to claim 1, wherein the method
comprises the steps of preparing two textile fibre webs, to be fed
by at least one corresponding introducer element upstream of the
air spinning device, drawing each of said webs with at least one
drawing device, joining said webs inside the spinning chamber and
spinning the fibres so as to obtain a yarn with a total thread
count of less than Ne20 and wherein the total number of internal
and external fibres is less than 200.
6. Air spinning method according to claim 2, wherein the method
comprises the steps of preparing two textile fibre webs, to be fed
by at least one corresponding introducer element upstream of the
air spinning device, drawing each of said webs with at least one
drawing device, joining said webs inside the spinning chamber and
spinning the fibres so as to obtain a yarn with a total thread
count of less than Ne20 and wherein the total number of internal
and external fibres is less than 200.
7. Air spinning method according to claim 3, wherein the method
comprises the steps of preparing two textile fibre webs, to be fed
by at least one corresponding introducer element upstream of the
air spinning device, drawing each of said webs with at least one
drawing device, joining said webs inside the spinning chamber and
spinning the fibres so as to obtain a yarn with a total thread
count of less than Ne20 and wherein the total number of internal
and external fibres is less than 200.
8. Air spinning method according to claim 1, wherein the working
pressures, i.e. of the compressed air jets inside the spinning
chamber, are between 0.45 and 0.6 MPa.
9. Air spinning method according to claim 1, wherein the working
speeds of the compressed air in output from relative nozzles,
inside the spinning chamber, are between 400 m/min and 500
m/min.
10. The yarn obtained by means of a spinning method according to
claim 1.
11. The yarn according to claim 7, wherein said yarn has an overall
thread count of less than Ne20 and wherein the total number of
inner and outer fibres of the yarn is less than 200.
12. The yarn according to claim 7, wherein said overall thread
count is greater than or equal to Ne10.
13. The yarn according to claim 8, wherein said overall thread
count is greater than or equal to Ne10.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present invention claims priority to Italian Patent
Application No. 102018000010751 filed on Dec. 3, 2018.
FIELD OF APPLICATION
[0002] The present invention relates to an air spinning method for
the production of yarns with a count lower than or equal to Ne20
and greater than or equal to Ne10, and a relative yarn obtained
with said method.
PRIOR ART
[0003] In particular, the air spinning of yarns having lower counts
than Ne20 is complicated since the tenacity and regularity of the
yarn tend to decrease drastically when making yarns with such low
counts.
[0004] The yarns that are normally processed on air-spinning
machines are PES, Viscose (and its modal, tencel variants, etc.),
cotton and the various compounds.
[0005] The prior art of the production of such yarns involves the
use of high quality fiber webs, that is with an average length of
38 mm and fiber diameter between 1.3 and 1.5 dtex for artificial
fibers and, in the case of cotton, with micronair lower than
4.2.
[0006] An empirical formula defines the following link:
micronair=2,824 deniers=2,824*1,111 dtex; so it follows that:
dtex=micronair/3,135.
[0007] The commonly accepted idea in the art is that in air
spinning machines it is necessary to have many fibers, indeed, as
many fibers as possible to obtain yarn with high strength and
elasticity.
[0008] The formula that calculates the number of fibers per section
is given as follows:
Number_fibers_section=5917/(Yarn_Count (Ne)*fibre count
(dtex))=15030/(Yarn_Count (Ne)*micronair(.mu.).
[0009] Clearly the first formula can be used in the case of
artificial fibers, the second for cotton.
[0010] There are even formulas of the American Ministry of
Agriculture which provide the maximum tenacity that can be reached
in spinning as a function, among the various parameters, of the
number of fibers that contribute to the formation of the yarn.
[0011] This formula of the American FDA, valid for ring cotton
carded yarns is the following:
cN/tex)=(1/count (Ne))*(19-52*Count (Ne)+6618*Fiber_length
(Inches)-236*micronair(.mu.)+51*Fiber_resistance (g/tex).
Expected_Yarn_Resistance
[0012] From the above formula, considering that lower micronair
values mean longer and more resistant fibers, it is evident that
greater resistances are obtained with lower micronairs.
[0013] Therefore, summarizing, the idea of increasing the number of
fibers in yarns in order to improve the strength and elasticity of
the yarn produced is known and consolidated in the art.
[0014] Thus the idea of making yarns with a high count, with a high
number of fibers, in which said fibers are relatively thin, to
increase their mechanical strength, is consolidated in the art.
[0015] It has instead been verified that this solution, in the case
of applications with air spinning, does not always give the optimum
compromise between strength and quality of the yarn thus
obtained.
DISCLOSURE OF THE INVENTION
[0016] The need to solve the drawbacks and limitations mentioned
with reference to the prior art is therefore felt.
[0017] Such a need is met by an air spinning method according to
claim 1 and by a yarn obtained by the air spinning according to
claim 4.
DESCRIPTION OF THE DRAWINGS
[0018] Further features and advantages of the present invention
will appear more clearly from the following description of
preferred non-limiting embodiments thereof, in which:
[0019] FIG. 1 shows a schematic view of an air spinning device for
implementing a spinning method according to an embodiment of the
present invention;
[0020] FIGS. 2a, 2b, 2c show a view, with increasing
magnifications, of a yarn made with air spinning, of the prior
art;
[0021] FIGS. 3a-3b show schematic sectional views of two yarns
obtained according to the method of the present invention and
according to the teachings of the prior art, respectively.
[0022] Elements or parts of elements in common to the embodiments
described below are referred to with the same reference
numerals.
DETAILED DESCRIPTION
[0023] With reference to the aforesaid figures, reference numeral 4
indicates a yarn, in particular obtained by means of an air
spinning, preferably with multiple feeding.
[0024] The present invention finds application in particular in the
use on man-made/synthetic fibers and possibly fibers mixed with
cotton, but not 100% cotton.
[0025] The yarn 4 comprises a plurality of threads 8 each
comprising a plurality of fibers 12.
[0026] By analyzing the threads 8 in section, a plurality of fibers
12 can be seen which can be divided into external fibers 16 and
internal fibers 20.
[0027] The internal fibers 20 are those which constitute the core
of the thread 8 in turn surrounded by the external fibers 16.
[0028] Advantageously, the present invention provides to obtain
yarns 4 with an overall number of fibers 12 lower than a maximum
value, preferably equal to 200.
[0029] Advantageously, it has been found that it is useful to use
thicker fibers as the yarn count decreases, so as to keep the total
number of fibers 12 ideally below the aforementioned maximum value,
preferably equal to 200.
[0030] The optimum is to have a number of fibers 12 sufficient to
give substance to the thread 8 but not too high to worsen its
technical features.
[0031] All this is due to the fact that, in air spinning, there is
no real twist as in traditional ring spinning: rather, in air
spinning, bundles of fibers are obtained that are wound more or
less regularly around a core of "neutral" central fibers, that is,
substantially not twisted.
[0032] Therefore in the air spinning it has been verified that the
external fibers 16 are twisted, while the internal fibers 20 are
neutral as can easily be seen in FIGS. 2a, 2b and 2c.
[0033] Typically, in the solutions of the prior art, a yarn Pes
100% of count Ne20, produced with air spinning machines, has a
fiber length of 38 mm and a section of 1.3 dtex and contains about
227 fibers.
[0034] A yarn Ne16 of the prior art, with the same raw material,
would contain 285 fibers.
[0035] The solution of the present invention provides instead to
maintain the fibers 12 under 200 units (maximum value) and the
reason is shown in FIGS. 3a, 3b.
[0036] In fact, in air spinning only the outermost fibers 16 are
involved in the "twisting" while the central or internal ones 20
remain substantially neutral. This means that the ratio between
external fibers 16 and internal fibers 20 must remain high, in
order to have a yarn with adequate mechanical features.
[0037] Regardless of the count being worked, it can be said that
the number of external fibers that are involved in the twisting
always remains the same, which is why the more fibers are in the
section, the more unfavorable, that is, low, the ratio between
external fibers (twisted) and internal fibers (not twisted).
[0038] In the accompanying figures (3a, 3b), a yarn with a count
Ne20 is ideally represented, made with 1.5 dtex fibers (FIG. 3a)
and 1.0 dtex fibers (FIG. 3b). It is clearly seen that in the first
case (FIG. 3a), having fibers of an average greater diameter, the
number of external fibers 16 or twisted, which are wound, with
respect to the internal ones 20 which remain neutral, is much
higher than in the second case (FIG. 3b), where the individual
fibers 12 (whether they are external fibers 16 or internal fibers
20) have a lower average diameter.
[0039] The present invention (FIG. 3a), as the counts decrease,
provides to increase the section of the fibers 12 used and
therefore reduce the total number thereof, to a maximum value
preferably equal to 200.
[0040] This section increase becomes extremely useful in synthetic
fibers where the value of the elongation at break increases with
the increase in the section of the fibers, with obvious benefits in
the final yarn: more resistance and more elasticity mean greater
quality and workability of the same yarn.
[0041] The air spinning method provides the steps of preparing at
least one web of textile fibers N1, to be fed by at least one
introducer element 24 upstream of an air spinning device 28.
[0042] The web N1 is previously drawn with at least one drawing
device 32, and then, after drawing, said web N1 is fed into a
spinning chamber 36 of an air spinning device 40.
[0043] Inside the spinning chamber 36 the fibers 12 are spun by
means of jets of compressed air, so as to obtain a yarn F
comprising internal fibers 20 surrounded by external fibers 16, in
which the yarn has an overall count lower than or equal to Ne20 and
greater than or equal to Ne10, and in which the total number of
internal and external fibers is less than 200.
[0044] In particular, the working pressures, i.e. the jets of
compressed air inside the spinning chamber 36, are preferably
between 0.45 and 0.6 MPa, i.e. between 4.5 and 6 bar.
[0045] The working speeds of the compressed air leaving the
relative nozzles are comprised between 400 m/min and 500 m/min.
[0046] Obviously, it is possible to feed two or more webs N1, N2,
with respective introducer elements 24, into the air spinning
device 28: these webs are joined together inside the spinning
chamber 36.
[0047] As can be seen from the above description, the air-jet
spinning method according to the invention allows the drawbacks of
the prior art to be overcome.
[0048] In particular, the present invention allows obtaining, by
means of air spinning, yarns with a count lower than or equal to
Ne20 and greater than or equal to Ne10. These yarns have features
of resistance and elasticity which are superior to the solutions
obtainable with the methods of the prior art.
[0049] In fact, as seen, as the counts decrease, it is provided to
increase the section of the fibers used and therefore reduce the
total number thereof, to a maximum value preferably equal to
200.
[0050] In this way, increasing the average diameter of the fibers,
the number of external fibers, twisted, which are wound, with
respect to the internal ones which remain neutral, is much higher:
this aspect determines the improvement of the mechanical features
of the yarn obtained.
[0051] Moreover, as seen, the section increase becomes extremely
useful in synthetic fibers where the value of the elongation at
break increases with the increase in the section of the fibers:
therefore more resistance and more elasticity are obtained and,
consequently, even greater quality and workability of the same
yarn.
[0052] Substantially, the present invention goes against the known
and consolidated idea in the art of increasing the number of fibers
in yarns in order to improve the strength and elasticity of the
yarn produced. The present invention teaches exactly the opposite,
namely to decrease the number of fibers in the yarns, increasing
their average size, in order to improve their mechanical and
workability features. Such teaching finds advantageous application
in the air-jet spinning sector.
[0053] In order to satisfy contingent and specific needs, a man
skilled in the art will be able to make numerous modifications and
variations to the air spinning methods for mixed yarns described
above, all of which fall within the scope of the invention as
defined by the following claims.
* * * * *