U.S. patent application number 09/813388 was filed with the patent office on 2001-10-11 for yarn relaxation-heating method and apparatus therefor.
This patent application is currently assigned to Teijin Seiki Co., Ltd.. Invention is credited to Ikeuchi, Takashi, Naito, Shunzo, Watanabe, Tetsuya.
Application Number | 20010027636 09/813388 |
Document ID | / |
Family ID | 16565186 |
Filed Date | 2001-10-11 |
United States Patent
Application |
20010027636 |
Kind Code |
A1 |
Naito, Shunzo ; et
al. |
October 11, 2001 |
Yarn relaxation-heating method and apparatus therefor
Abstract
In a relaxation-heating method and an apparatus therefor,
relaxation-heating is performed by a heating apparatus which is
provided between a yarn supply roller (5) and a take-up roller (7)
having a speed lower than that of the supply roller (5) and which
is constituted by a heating roller (6a) and an auxiliary bobbin
(6b). In the relaxation-heating method and an apparatus therefor,
the size is compact, the heat conductivity is high and yarn can be
made to run at a high speed.
Inventors: |
Naito, Shunzo; (Ehime,
JP) ; Ikeuchi, Takashi; (Ehime, JP) ;
Watanabe, Tetsuya; (Ehime, JP) |
Correspondence
Address: |
AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.
ONE COMMERCE SQUARE
2005 MARKET STREET, SUITE 2200
PHILADELPHIA
PA
19103
US
|
Assignee: |
Teijin Seiki Co., Ltd.
|
Family ID: |
16565186 |
Appl. No.: |
09/813388 |
Filed: |
March 21, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09813388 |
Mar 21, 2001 |
|
|
|
PCT/JP00/04855 |
Jul 19, 2000 |
|
|
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Current U.S.
Class: |
57/240 |
Current CPC
Class: |
D02G 1/20 20130101; D02J
13/005 20130101; D02G 1/0266 20130101; D02J 1/22 20130101 |
Class at
Publication: |
57/240 |
International
Class: |
D02G 003/02; D02G
003/36 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 23, 1999 |
JP |
11-208970 |
Claims
We claim:
1. A yarn relaxation-heating method characterized in that
relaxation-heating is performed by a heating apparatus which is
provided between a yarn supply roller and a take-up roller having a
speed lower than that of said supply roller, said heating apparatus
being constituted by a heating roller and an auxiliary bobbin.
2. A yarn relaxation-heating apparatus characterized in that said
apparatus comprises a yarn supply roller, a take-up roller having a
speed lower than that of said supply roller, and a heating
apparatus provided between said take-up roller and said supply
roller and constituted by a heating roller and an auxiliary
bobbin.
3. A yarn relaxation-heating apparatus according to claim 2,
wherein said heating roller is a tapered-off roller.
4. A yarn relaxation-heating apparatus according to claim 2,
wherein said auxiliary bobbin is a guide roller which rotates
freely.
5. A yarn relaxation-heating apparatus characterized in that said
apparatus comprises a yarn supply roller, a take-up roller having a
speed lower than that of said supply roller, and a heating
apparatus provided between said take-up roller and said supply
roller and constituted by a pair of heating rollers.
6. A yarn relaxation-heating apparatus according to claim 5,
wherein at least one of said pair of heating rollers is a
tapered-off roller.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation of International
Application No. PCT/JP00/04855 filed Jul. 19, 2000 the disclosure
of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to a yarn relaxation-heating
method and an apparatus therefor. More particularly, the present
invention relates to a yarn relaxation-heating method and a yarn
relaxation-heating apparatus for use in false-twisting
thermoplastic synthetic fiber such as polyester fiber, polyamide
fiber, etc.
[0003] Heretofore, in false-twisting or rolling and false-twisting
of such synthetic fiber, a so-called first heater which is a
heating apparatus for false-twisting and fixation, and a so-called
second heater which is a heating apparatus for performing
relaxation-heating of yarn to improve thermal size stability to
obtain low-stretchable false-twisted yarn are used as disclosed in
JP-A-5-98530, JP-A-6-322625, JP-A-7-34338, JP-A-8-120533 or
JP-A-10-331040.
[0004] In the second heater, heretofore, a non-contact grooved
heater or a pipe heater is provided between a yarn supply roller
(feed roller) and a take-up roller having a speed lower than that
of the supply roller in order to perform relaxation-heating
(contractive heating).
[0005] In a relaxation-heating apparatus using the background-art
second heater, the temperature of the contact type pipe heater is
limited to 230.degree. C. at the maximum. Moreover, it is necessary
to make the pipe heater long for high-speed treatment. Hence, there
is a problem that contact resistance becomes high. On the other
hand, the high-temperature non-contact type grooved heater is poor
in heat conductivity because the heater is of the non-contact type.
Hence, the heater becomes long. Further, the temperature of a
heating plate cannot but be made high. Moreover, there are various
problems that heating spots are caused by swinging of yarn running
at a high speed or caused by distortion of the yarn by the
torque.
[0006] The present invention is designed in consideration of such
problems and provides a relaxation-heating method and an apparatus
therefor, in which the size is compact, the heat conductivity is
high, and yarn can be made to run at a high speed.
[0007] Incidentally, JP-U-60-9979 discloses a rolling and heating
apparatus having a heating roller and a separate roller opposite to
the heating roller. The heating roller has a roller diameter which
is increased linearly in a longitudinal direction from the yarn
input side toward the yarn output side, and has a temperature
gradient so that the surface temperature of the roller is increased
from the yarn input side toward the yarn output side. Further, U.S.
Pat. No. 3,803,674 discloses a method and an apparatus for heating
thermoplastic yarn. The apparatus has, for example, two rollers
(68, 69) separated from each other.
[0008] As means for solving the aforementioned problem, the method
according to the present invention has a feature in which
relaxation-heating is performed by a heating apparatus which is
provided between a yarn supply roller and a take-up roller having a
speed lower than that of the supply roller, the heating apparatus
being constituted by a heating roller and an auxiliary bobbin.
BRIEF SUMMARY OF THE INVENTION
[0009] Further, the apparatus according to the present invention is
has a feature in that the apparatus is provided with a yarn supply
roller, a take-up roller having a speed lower than that of the
supply roller, and a heating apparatus provided between the take-up
roller and the supply roller and constituted by a heating roller
and an auxiliary bobbin. As a result, the apparatus is compact in
size and high in heat conductivity. Further, the apparatus can
prevent occurrence of various heating spots which are generated by
the running of yarn. Other features, operations and effects of the
present invention will be described in detail in the following
disclosure.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0010] The foregoing summary, as well as the following detailed
description of preferred embodiments of the invention, will be
better understood when read in conjunction with the appended
drawings. For the purpose of illustrating the invention, there is
shown in the drawings embodiments which are presently preferred. It
should be understood, however, that the invention is not limited to
the precise arrangements and instrumentalities shown.
[0011] In the drawings:
[0012] FIG. 1 is a typical flow diagram of a rolling and
false-twisting apparatus using a first embodiment of a heating
apparatus according to the present invention.
[0013] FIG. 2(a) is a partly perspective view of a heating roller
portion depicted in FIG. 1, and FIG. 2(b) is a perspective view of
a heating roller portion in another embodiment of the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0014] The present invention will be described below in detail on
the basis of a preferred embodiment of the present invention.
[0015] FIG. 1 is a typical flow diagram of a rolling and
false-twisting apparatus using an embodiment of an apparatus
according to the present invention. In FIG. 1, the reference
numeral 1 designates a first feed roller for taking up yarn Y while
relaxing yarn Y from a yarn package P. The reference numeral 2
designates a first heater; 3, a cooling plate; and 4, a false
twister for giving false twist to the yarn Y The reference numeral
5 designates a second feed roller for taking up the yarn at a speed
higher than the yarn feed seed of the first feed roller 1 and for
rolling the yarn Y.
[0016] The reference numeral 6 designates a second heater (which
will be described later in detail); and 7, a third feed roller. The
third feed roller 7 takes up, at a speed lower than the speed of
the second feed roller 5, the yarn delivered from the second feed
roller 5 after the yarn is relaxation-heated by the second heater
6. The third feed roller 7 delivers the yarn to a winder 8.
[0017] A so-called rolling and false-twisting apparatus, which is
constituted by the first feed roller 1, the first heater 2, the
cooling plate 3, the false twister 4, the second feed roller 5, the
second heater 6, the third feed roller 7 and the winder 8, is a
known means for obtaining low-shrinkage false-twisted yarn by the
second heater system. The rolling and false-twisting apparatus is
heretofore well-known and the detailed description of this
mechanism will be omitted.
[0018] The second heater 6 includes a heating roller 6a, and a free
rotation roller 6b (also called separate roller) which is an
auxiliary bobbin. Yarn Y is wound so as to circumscribe the heating
roller 6a and the free rotation roller 6b (see FIG. 2(a)). The
inclination of the free rotation roller 6b to the heating roller 6a
is adjusted so as to adjust the pitch d of the wound yarn Y to
thereby adjust the number of turns of the yarn, that is, the
contact length of the yarn with the heating roller 6a.
[0019] The second feed roller 5, the second heater 6 and the third
feed roller 7 constitute a yarn relaxation-heating apparatus
described in the present invention. The second feed roller 5 is
equivalent to a supply roller. The heating roller 6a and the
auxiliary bobbin 6b constitute a heating apparatus. The third feed
roller 7 is equivalent to a take-up roller.
[0020] As described above, in the relaxation-heating apparatus
according to the present invention, yarn is heated in the condition
that the yarn is wound so as to circumscribe the heating roller 6a
and the auxiliary bobbin 6b. Hence, heating efficiency is so high
that high-speed treatment can be made because the heating is
direct-contact heating. Moreover, the running of the yarn is stable
because it is contact-running. Hence, there occurs no heating spot
due to running spots caused by the distortion of the false-twisted
yarn by the torque or caused by swinging of the yarn. Moreover, the
contact length of the yarn with the heating roller can be set at
option. In other words, the number of turns of the yarn can be set
at option. Hence, the heating condition can be widened widely, and
the relaxation-heating condition can be diversified.
[0021] The yarn slides between the heating roller 6a and the
auxiliary bobbin 6b to thereby absorb divergence or looseness
involved in contraction of the yarn. To make the absorption of
contraction smoother, the heating roller may be tapered off to
thereby effectively reduce the yarn feed speed in accordance with
heating. Moreover, to make the contraction sliding of the yarn
smoother, the surface of the roller may be subjected to so-called
matte-finishing to thereby reduce frictional resistance.
[0022] The percentage of taper of the heating roller is preferably
selected in consideration of the percentage of over-feed. When, for
example, the ratio of the second feed roller speed to the third
feed roller speed is 100:95 and the yarn is wound onto the heating
roller by a plurality of turns, the contraction of the yarn on the
heating roller can be absorbed ideally if the ratio of the diameter
at a portion corresponding to the first turn to the diameter at a
portion corresponding to the last turn is selected to be
100:95.
[0023] It is effective that the relaxation-heating apparatus
according to the present invention is used with the percentage of
over-feed in a range of from 5% to 10% which is higher than that in
an ordinary high-speed type rolling and false-twisting apparatus.
If the percentage of over-feed is higher than the aforementioned
range, swinging of yarn or heating spots are apt to occur. If the
percentage of over-feed is lower than the aforementioned range, it
is difficult to reduce the percentage shrinkage. In a
general-purpose machine used with the change of the percentage of
over-feed, it is easy to adapt the machine to various conditions if
the taper is selected so that the diameter at the portion
corresponding to the last turn is smaller by 5-7% than the portion
corresponding to the first turn. Further, the percentage of taper
may be increased/reduced slightly more than the over-feed ratio in
consideration of the frictional resistance of the ordinary
auxiliary bobbin, or the like.
[0024] Although the aforementioned embodiment has shown the case
where a so-called separate roller is used as the auxiliary bobbin,
the auxiliary bobbin may be constituted not by a rotation roller
but by a non-rotation yarn guide. Alternatively, in place of the
auxiliary, a pair of heating rollers may be provided as shown in
FIG. 2(b). In this case, yarn is heated while running in the
condition that the yarn is wound so as to circumscribe the pair of
heating rollers 60a and 60b. Although FIG. 2(b) shows the case
where the heating roller 60a is tapered off, both the rollers may
be tapered off or both the rollers may be straight rollers as
occasion demands.
EXAMPLE
[0025] An example of yarn relaxation-heating process by using the
apparatus of FIG. 1 will be described below.
[0026] (1) Factors of Heating Apparatus used
[0027] Heating Roller Diameter 100 mm.o slashed.(straight
roller)
[0028] Length 85 mm
[0029] Surface Temperature 140-230.degree. C. (variable)
[0030] (2) Yarn Treating Condition
[0031] A. False Twisting Condition
[0032] Name polyester yarn 150 D (denier)/30 (single yarn)
[0033] Draw Ratio 1.56
[0034] First Heater Temperature (vertical separate type) upper
portion temperature 500.degree. C., lower portion temperature
390.degree. C.
[0035] Treating Speed 900 m/min
[0036] False Twisting System triaxial friction disk system
(composed of eight disks inclusive of upper and lower guide
disks)
[0037] B. Relaxation-Heating Condition
[0038] Surface Temperature 160.degree. C.
[0039] Percentage of over-feed 5%
[0040] (second feed roller speed/third feed roller
speed=100/95)
[0041] (second feed roller speed/heating roller speed=100/97.5)
[0042] Contact Length, the number of turns 4
[0043] (3) Treating Result
[0044] Quality of Treated Yarn
[0045] Uniform low-shrinkage false-twisted yarn with a percentage
of shrinkage of 10.5% was obtained. The percentage of shrinkage was
obtained on the basis of measurement of the draw ratio of picked-up
yarn after the picked-up yarn was boiled in boiling water and then
dried.
[0046] (In a background-art heater, local defects, that is,
so-called tight spots were produced at high-temperature
relaxation-heating. At such a treating temperature that such tight
spots are not produced, the percentage of shrinkage was limited to
17.9% at the maximum).
INDUSTRIAL APPLICABILITY
[0047] The present invention can be applied to a yarn
relaxation-heating method and an apparatus therefor. More
specifically, the present invention can be applied to a yarn
relaxation-heating method and a yarn relaxation-heating apparatus
for use in false-twisting thermoplastic synthetic fiber such as
polyester fiber, polyamide fiber, etc. Relaxation-heating is
performed by a heating apparatus which is provided between a yarn
supply roller and a take-up roller having a speed lower than that
of the supply roller and which is constituted by a heating roller
and an auxiliary bobbin. Hence, heating efficiency is so high that
high-speed treatment can be made because the heating is
direct-contact heating. Hence, the apparatus can be made compact.
Moreover, the running of the yarn is stable because the running is
contact running. Hence, there occurs no heating spot due to running
spots caused by distortion of the false-twisted yarn by the torque
or caused by swinging of the yarn. Moreover, the contact length of
the yarn with the heating roller can be set at option. In other
words, the number of turns of the yarn can be set at option. Hence,
the heating condition can be widened largely, so that the
relaxation-heating condition can be diversified.
[0048] It will be appreciated by those skilled in the art that
changes could be made to the embodiments described above without
departing from the broad inventive concept thereof. It is
understood, therefore, that this invention is not limited to the
particular embodiments disclosed, but it is intended to cover
modifications within the spirit and scope of the present invention
as defined by the appended claims.
* * * * *