JPS6367568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When false twisting and crimping two or more fiber yarns consisting of a core yarn and a sheath yarn, the present invention provides a method for twisting and crimping two or more fiber yarns consisting of a core yarn and a sheath yarn. Intermittently overfeed the yarn by 10 to 300% to entangle it, and change the position of the entanglement point of the sheath yarn with respect to the core yarn and the speed of vertical movement in the same way for each set of 10 to 20 sheath yarns. The present invention relates to a method for producing a special false-twisted crimped yarn in which strong multi-layer wound portions and non-multilayer wound portions having various lengths and thicknesses are distributed in the same manner.

Traditionally, slub-like yarns have been manufactured using a twisting machine, but this method has low productivity, so a method using a false twisting method, which has extremely high productivity, has been researched and introduced in many fields. .

Representative examples include Special Publication No. 43-28258,
There is Japanese Patent Publication No. 45-28018, which describes how to false twist multiple thermoplastic fiber yarns by changing the yarn feeding speed and yarn feeding tension of each fiber yarn in the twisting area outside the heater. Intermittent slabs are formed by intertwining the above-mentioned fiber threads and varying the positions of the intertwining points.

In both cases, slub-like yarns can be obtained in terms of morphology, but they have drawbacks such as poor cohesiveness and the slub-like portions flowing or collapsing during the subsequent product manufacturing process, as well as the core yarn coming loose.

In addition, Japanese Patent Publications No. 45-16895 and No. 47-50338 all disclose a method of obtaining slab-like yarn by intermittently changing the feeding speed, feeding tension, or position of the entanglement point of the sheath yarn with respect to the core yarn. However, in Special Publication No. 45-16895, the sheath yarn is applied to the core yarn with a tension range of 3.0 ± 0.5 g.
% overfeed, and
No. 47-50338 supplies sheath yarn at a tension range of 0 to 0.1 g. In both cases, after the sheath yarn is false-twisted with a relatively low supply tension, the processed yarn is rubbed in the false-twisting/untwisting area, and the sheath yarn is intermittently gathered to create a slab-like false-twisted yarn. This is what you get.

As a result, the sheath yarn becomes slack and a slub-like part is formed, so the slub-like part is soft and has good bulk, but
The disadvantage is that the core thread and sheath thread are separated, resulting in poor bundling and difficulty in handling.

Therefore, it is necessary to improve the cohesiveness of the false-twisted yarn by gluing it, twisting it, or wrapping it with another yarn in a subsequent process, which has the drawback of significantly reducing economic efficiency. .

In addition, in the conventional method for manufacturing slub-like textured yarn, the entanglement point between the core yarn and sheath yarn is located outside the heater, so not only is it impossible to obtain a strong slub-like part, but also the entanglement point is located outside the heater. Since the position of the heater is different for each heater, there is a drawback that the length, shape, and distribution of the slab-like portion formed by each heater are not equal.

The present invention has been made for the purpose of improving the conventional drawbacks as described above, and is as follows.
In other words, when false twisting and crimping two or more fiber yarns consisting of a core yarn and a sheath yarn, the sheath yarn is placed close to each core yarn running at a constant speed in the heater, and the sheath yarn is inserted from the side.
Overfeed intermittently by 10 to 300%, preferably 50 to 150%, to entangle each sheath yarn with each core yarn in the above heater, and adjust the entanglement point of each sheath yarn with each core yarn. S ₁ (m/min) is somewhat smaller than the running speed S ₀ (m/min) of each core thread, S ₁ =S ₀ -ND/i 1<i<8 preferably 2<i<5 where N is the twisting speed (T/
min) D is the diameter of the sheath yarn (μ) i is the number of winding layers at each position of the sheath yarn T is the number of windings of the sheath yarn with respect to the core yarn The strong multilayer winding of each sheath yarn with respect to each core yarn is formed, and the descending speed of the entanglement point when forming the non-multilayer winding part of each sheath thread S ₂
(m/min), rising speed S ₃ (m/min), S ₂ = S ₀ −N/C ₂ , −S ₃ = S ₀ −N/C ₃ N/S ₀ <C ₂ ≦1/D, N/S ₀ + (S ₃ ) _nax ≦C ₃ ≦
N/S ₀ Here, C ₂ is the winding density of the sheath yarn when the entanglement point is lowered (T/m) C ₃ is the winding density of the sheath yarn when the entanglement point is raised (T/m) (S ₃ ) _nax is the maximum speed (m/min) when the entanglement point rises, and each set of 10 to 20 sheath yarns is formed in the same way for each core yarn by each sheath yarn. Production of a special false-twisted crimped yarn characterized in that the length, winding density, and number of winding layers of the multilayer winding part and the non-multilayer winding part are varied in an extremely complex manner as designed. It's a method.

It is preferred that the multilayer windings have various lengths in the range of 5 to 150 mm and are intermittently distributed in a highly complex design at various pitches in the range of 3 to 200 cm.

An example of a manufacturing apparatus for carrying out the manufacturing method of the present invention will be described in detail below with reference to the drawings.

As shown in Figures 1 and 2, a large number of packages 1
Each of the core yarns 2 drawn out from the core yarns 2 is fed into the first heater 5 at a constant speed by the rotation of the feed roller 4 through each guide 3, and twisted by each false twisting device 8. Each sheath yarn 2' pulled out from a large number of package cages 1' passes through a guide 3' and is rotated by a feed roller 4'.
The threads are overfed by 10 to 300%, preferably 50 to 150%, and passed through 10 to 20 respective thread guides 22 attached to guide rods 21 at the tips of the guide bars 20, 20', and then installed on the side wall of each heater 5. is drawn into each first heater 5 through the respective vertical gaps 23,
They are entangled with the core threads 1 running at a constant speed inside each of the first heaters 5. As will be described later, the guide rod 21 moves up and down along the gap 23 between each of the first heaters 5 at variable speeds as designed.
Thread guide 2 attached to guide rod 21
2 is provided close to the gap 23 of each first heater 5, so that the entanglement point 6 of the core thread 2 and sheath thread 2' running inside each first heater 5 is also located within each first heater 5. It moves up and down at a predetermined variable speed as designed. Each of the core threads 2 and sheath threads 2' entangled within each of the first heaters 5
Since false twisting is applied inside the sheath threads 2', each sheath thread 2' is tightly wound around each core thread 2.

Moreover, when forming a multi-layer winding part, the sheath yarn 2' is 10 to 300%, preferably 50 to 150%.
The predetermined amount of overfeed is determined by the length and thickness of the multilayer winding portion and its distribution density. Each sheath yarn 2' that is overfed by a predetermined amount is wound around each core yarn 2 running in each first heater 5 with sufficient tension due to the frictional resistance between it and the thread guide 22. Therefore, there is no possibility that loop-like hairs will be formed on the outer periphery of the multilayer winding portion due to the sheath threads 2'.

The core yarn 2 and sheath yarn 2' combined in each of the first heaters 5 are partially heat-set in each of the first heaters 5 to form the special false twisted crimped yarn 7.
and passes through each false twisting device 8 to the delivery roller 9
It is sent into each second heater 10 through the. After being fixed in shape after false twisting and crimping in each of the second heaters 10 , it is pulled out, passed through a delivery roller 11 , and wound onto each bobbin 12 .

In addition, there is a guide rod 21 that moves the sheath thread 2' up and down.
Guide bars 20, 20' are fixed to both ends of the slide bars 18, 18', respectively, and these guide bars 20, 20' are fixed to the lower ends of slide bars 18, 18', respectively. The slide bars 18, 18' are supported so as to be slidable in the vertical direction by support members 19, 19' fixed to the frame.
The upper ends of 8 and 18' are connected by a horizontal rod 17.
Two guide rollers 24, 24' are attached to the center of the horizontal rod 17 in close proximity to each other.
The guide roller 24,
24'.

A cam 14 is attached to the shaft of an induction motor 13 electrically connected to a transmission 26, and a friction roller 25 attached to the middle part of a swing lever 15 is brought into contact with the circumferential surface of the cam 14. . Note that the reference numeral 27 is a vibration-proof heavy peg for smoothing the swinging of the swinging lever 15. Gearbox 2
Induction motor 1 electrically connected to 6
3 rotates at a predetermined speed as designed, so the swing lever 15 swings at a predetermined speed.
Therefore, the slide bars 18, 18' also move up and down at a predetermined variable speed.

Therefore, the guide rod 21 at the front end of the guide bar 20, 20' attached to the lower end of the slide bar 18, 18' moves up and down at a predetermined variable speed.
The thread guides 22, each set of 10 to 20 thread guides attached to the guide rod 21, also move up and down at variable speeds as designed. Therefore, the position of each entanglement point 6 of each core yarn 2 and sheath yarn 2' running at a constant speed inside the first heater 5 is also
It will move up and down at variable speeds as designed. In this way, a multilayer winding part and a non-multilayer winding part of the special false twisted crimped yarn are formed. The explanation is as follows.

Let dt (min) be the time during which the sheath yarn 2' travels in a certain minute section dl (m) of the core yarn 2 while winding the core yarn 2, and the winding density of the sheath yarn 2' in this section dl (m) is If C (T/m) and the descending speed of the intertwining point 6 of the sheath thread 2' with the core thread 2, that is, the descending speed of the thread guide 22, are S (m/min), then dl = (S ₀ - S) dt C=Ndt/dl Here, S ₀ is the running speed of the core yarn (m/min), N is the twisting speed of the false twist crimping machine (T/min), and T is the number of windings of the sheath yarn with respect to the core yarn. From the equation above, S=S ₀ -N/C (1) In the non-multilayer winding part of the sheath thread 2' around the core thread 2, the winding layer of the sheath thread 2' is wound around the outer periphery of the core thread 2. The number is 1, and C indicates the winding density (T/m) of the sheath yarn 2' at each position of the core yarn 2.

In the multi-layer winding part of the sheath thread 2' around the core thread 2, the number of winding layers i of the sheath thread 2' wound around the outer periphery of the core thread 2 is i>1, and one layer of the sheath thread 2' is wound around the outer periphery of the core thread 2. _{The winding density of the sheath thread 2' in the multi-layer winding section is iC 0 (} T/m).
becomes. If the diameter of the sheath thread 2' is D (μ), then C ₀ = 1/D (2), so C = iC ₀ = i/D (3) Therefore, in the multilayer winding part, the The descending speed of the entangled point 6 of the sheath thread 2', that is, the descending speed of the thread guide 22 S ₁ (m/min) is (1), (3)
From the formula, S ₁ =S ₀ -ND/i (4) In the present invention, the number i of winding layers of the sheath yarn 2' in the multilayer winding portion is limited as follows.

1<i<8 Preferably 2<i<5 (5) The multi-layer winding portion of the sheath yarn 2' around the core yarn 2 has a lowering speed of the entanglement point 6 of the sheath yarn 2' with respect to the core yarn 2 as described above. , that is, the descending speed of the thread guide 22
S ₁ (m/min) is the descending speed of the core thread 2 as shown above.
It is formed by slightly smaller than S ₀ (m/min).

Since the non-multilayer winding portion of the sheath yarn 2' relative to the core yarn 2 is formed by the vertical movement of the thread guide 22, the core The descending speed S ₂ (m/min) of the entanglement point 6 of the sheath thread 2' with respect to the thread 2 is calculated from equation (1) as follows: S ₂ = S ₀ −N/C ₂ (6) Here, C ₂ is the descending speed of the thread guide. The winding density (T/m) of the sheath yarn when The maximum descending speed of 2′ (S ₂ ) _nax (m/min) is
It can be obtained by substituting i=1 into (4).

(S ₂ ) _nax = S ₀ −ND (7) Maximum value of winding density C ₂ of sheath thread 2' at this time (C ₂ ) _na
x (T/m) is (C ₂ ) _nax = 1/D (8) from equation (2). When the descending speed S ₂ of the entanglement point 6 of the sheath yarn 2' is 0, the winding density C ₂ of the sheath yarn 2' corresponding to the core yarn 2 is
(T/m) is (C ₂ ) _S2=0 = N/S ₀ from equation (6). In the non-multilayer winding part formed by the rise of the entanglement point 6, the rising speed S ₃ (m/min) of the entanglement point 6 of the sheath yarn 2' with respect to the core yarn 2 is calculated from equation (1) -S ₃ = S ₀ −N/C ₃ (9) Here, C ₃ is the winding density of the sheath yarn (T/m) when the thread guide rises, and the rising speed S ₃ (m/min) of the entanglement point 6 is The winding density (C ₃ ) of the sheath thread 2' when the winding density is 0 (C 3 ) _S3=0 (T/m) is given by formula (9). (C ₃ ) _S3=0 = N/S ₀ (10) The rising speed S ₃ (m/min) is the maximum value (S ₃ )
When _nax (m/min), the winding density of sheath thread 2' is C ₃
(T/m) is the minimum value (C ₃ ) _nio (T/m) ( _nio
(indicates the minimum value), and from equation (9), it is given by (C ₃ ) _nio = N/S ₀ + (S ₃ ) _nax (10′).

The shape of the circumferential surface of the cam 14 is shown in the following polar coordinates, with the center of rotation of the cam 14 being the origin and the length from this origin to the circumferential surface of the cam 14 being radius r (m).

r=f(θ) (11) where r is the radius (m), θ is the declination angle (rad), and f(θ) is a function approximating a cosine curve with a period of 2π. Support shaft 16 of the swinging lever 15 The length m ₁ (m) between the friction roller 25 and the friction roller 25 is the radius r of the cam 14.
(m), the contact point between the friction roller 25 of the swinging lever 15, which swings vertically due to the rotation of the cam 14, and the cam 14 moves in the vertical direction. It is regarded as a linear motion, and its speed υ (m/min) is expressed by the following equation.

υ＝dr／dt＝f′(θ)dθ／dt＝f′(θ)ω (12) Here, ω is the rotational angular velocity of the cam (rad/min). Therefore, due to the vertical movement of the swing lever 15, ,
Speed S of the thread guide 22 moving in the vertical direction
(m/min) is expressed by the following formula.

S=kυ=kf'(θ) (13) Here, k is the magnification ratio by the swing lever k≒m ₂ /m ₁ , and m ₂ (m) is the contact point between the swing lever 15 and the guide rollers 24, 24'. From the support shaft 16
The length is up to.

Therefore, the descending speed S ₁ (m/min) of the thread guide 22 when the multilayer winding portion is formed by the rotation of the cam 14 is: S ₁ =kf′(θ)ω (14) The value of the deflection angle θ (rad) (referred to as rotation angle θ) of the cam 14 when the winding portion is formed is given by the following equation from equations (4) and (14).

S ₀ −ND/i=kf′(θ)ω (15) Here, 1<i<8, preferably 2<i<5. The value of rotation angle θ (rad) is (15)
Since this is the value of θ (rad) when i=1 in the equation, it is given by the following equation.

S ₀ −ND=kf′(θ)ω (16) To facilitate consideration, it is assumed that the rotational angular velocity ω (rad/min) during one rotation of the cam 14 is constant, and θ that satisfies the above equation is assumed to be constant. (rad) values as θ ₁ (rad) and θ ₂
If (θ ₁ <θ ₂ ) (rad), the multilayer winding part is (15)
In the equation, the rotation angle of the cam 14 is formed in the range θ ₁ <θ<θ ₂ . Therefore, the non-multilayer winding part is 0θ
They are formed in the range of θ ₁ and θ ₂ θ≦2π. The maximum value (S ₂ ) of the descending speed S ₂ (m/min) of the thread guide 22 when a non-multilayer winding part is formed.
From equation (16), _nax (m/min) is (S ₂ ) _nax = kf' (θ ₁ ) ω = kf' (θ ₂ ) ω = S ₀ −ND (17) Therefore, the multilayer winding part is The descending speed S ₁ (m/min) of the thread guide 22 when it is formed is (15)
In the formula, it changes in the range θ ₁ < θ < θ ₂ .

Lowering speed of thread guide 22 S ₂ (m/min)
If the value of the rotation angle θ (rad) of the cam 14 when becomes 0 is 0 and θ ₃ (θ ₂ <θ ₃ ) (rad), then from equation (14) kf' (θ) = kf' (θ ₃ ) = 0 (18) Therefore, the rotation angle θ of the cam 14 at which the non-multilayer winding portion is formed by the descent of the thread guide 22
The range of (rad) is 0θθ ₁ , θ ₂ θθ ₃ , and the rotation angle θ (rad) of the cam 14 where the non-multilayer winding portion is formed by the raising of the thread guide 22.
The range of is θ ₃ <θ<2π. The rotation angle θ (rad) of the cam 14 is θ ₃ <θ<2π
The rising speed of the thread guide 22 is within the range S ₃
The value of θ (rad) that maximizes (m/min) is θ ₄ (rad)
Then, from equation (13), (S ₃ ) _nax = kf′ (θ ₄ ) ω (19) Therefore, the value of the rotation angle θ (rad) of the cam 14 is θ ₄
(rad), the winding density C ₃ (T/m) of the sheath thread 2' in the non-multilayer winding part is the minimum value (C ₃ ) _nio
(T/m), which is given by the following equation from equations (10') and (19).

(C ₃ ) _nio = N/S ₀ + kf' (θ ₄ ) ω (20) The length m ₁ (m) between the support shaft 16 of the swing lever 15 and the friction roller 25 is the radius vector of the cam 14. If the length is not sufficiently longer than the difference between the maximum value and the minimum value of r(m), the friction roller 2 of the swing lever 15, which swings vertically due to the rotation of the cam 14,
The movement of the contact point between the cam 14 and the cam 14 is not regarded as a linear movement in the vertical direction. Further, in the above case, the expansion ratio k (k=m ₂ /m ₁ ) by the swing lever 15
is a function of the rotation angle θ (rad) of the cam 14. This general case will be considered as follows.

As shown in FIGS. 1 and 2, the swing lever 1 is rotated by the variable speed rotation of the induction motor 13.
5 swings about the support shaft 16, and the slide bars 18, 18' move up and down. Therefore, the thread guides 22 attached to the guide rods 21 respectively
moves up and down. Therefore, the vertical displacement H (m) of the thread guide 22 is the rotation angle θ of the cam 14.
As a function of (rad), it is shown as follows.

H=F(θ) (21) Here, F(θ) is a function approximated to a cosine curve with a period of 2π Rotational angular velocity ω of the induction motor 13
(rad/min) changes in a very complicated manner depending on the setting conditions of the transmission 26, so ω(rad/min) becomes a function of time t(min). Therefore, the vertical speed S (m/min) of the thread guide 22 is also a function of time: S=dH/dt=F'(θ)dθ/dt=F'(θ)ω(22
).

A multilayer winding part is formed when the descending speed S of the thread guide 22 satisfies the condition of equation (4), so from equations (4) and (22), F'(θ)ω=S ₀ −ND /i (23) where 1<i<8 preferably 2<i<5 therefore S ₀ −ND<F′(θ)ω<So−ND/8 preferably So−ND/2<F′( θ) ω<S ₀ -ND/5 (24) In the device of the present invention, other configuration conditions other than the transmission 26 and the induction motor 13, namely the cam mechanism, the position of the support shaft 16 of the swing lever 15, and the slide When the configuration conditions such as guide rollers 24, 24' of bars 18, 18' are set, F
(θ) and F'(θ) are determined, the limit of the rotational angular velocity ω (rad/min) of the induction motor 13 for forming the multilayer winding portion is given as follows.

S ₀ −ND/F′(θ)＜ω＜S ₀ −ND/8/F′(θ
) Preferably S ₀ −ND/2/F′(θ)<ω<S ₀ −ND/5/F′
(θ) (25) The transmission 26 is the induction motor 13
Although the speed is set to vary extremely complicatedly, a multilayer winding portion is formed by setting the value of ω (rad/min) within a range that satisfies the above equation.

The connecting position of the multilayer winding part and the non-multilayer winding part is
Since the number of winding layers i of the sheath yarn 2' is 1, from equation (23), S ₀ −ND=F′(θ)ω F′(θ)=(S ₀ −ND)/ω (26) The values of θ (rad) that satisfy the formula are θ ₁ (rad) and θ ₂ (θ ₁
<
θ ₂ )(rad), the range of values of the rotation angle θ(rad) of the cam 14 to form the multilayer winding portion is as shown in equations θ ₁ <θ<θ ₂ (27) and (25). Since the induction motor 13 changes speed in various ways within the range of the value of ω (rad/min) for forming the multi-layer winding section, the length of the multi-layer winding section changes variously.

In addition, the winding density of the sheath thread 2' in the multilayer winding part is C ₀
(T/m) is C ₀ =1/D from equation (2).

In the non-multilayer winding portion of the sheath yarn 2' around the core yarn 2, the number i of winding layers of the sheath yarn 2' wound around the outer layer of the core yarn 2 is 1, and the number of winding layers i of the sheath yarn 2' wound around the outer layer of the core yarn 2 is 1, and If the winding density of the sheath thread 2' is _C (T/m) at The rotation angle θ (rad) of the cam 14 when the speed S ₂ (m/min) becomes 0 is 0, θ ₃ (θ ₂ <θ ₃ ) (rad), and the sheath thread 2' at these positions is The value of the winding density C (T/m) of (C ₂ ) _S2=0
(T/m), then from equation (28), F'(θ)ω=F'(θ ₃ )ω=S ₀ −N/(C ₂ ) _S2=0 =0 Therefore, (C ₂ ) _{S2 =0} =N/S ₀ (29) Therefore, by lowering the thread guide 22,
The range of the rotation angle θ (rad) of the cam 14 when the non-multilayer wound portion is formed is 0θθ ₁ , θ ₂ θθ ₃ The range of the winding density C (T/m) of the sheath yarn 2' at this time is N/S ₀ C1/D (30).

Further, the rotation angle θ of the cam 14 when the non-multilayer winding portion is formed by raising the thread guide 22.
The range of (rad) is θ ₃ < θ < 2π The rising speed of the thread guide 22 S ₃ (m/min)
If the maximum value of is (S ₃ ) _nax (m/min) and the value of the rotation angle θ (rad) of the cam 14 at this time is θ ₄ (rad), then the winding of the sheath thread 2' at this position is Density C ₃ (T/m)
is the minimum value (C ₃ ) _nio (T/m), and from equation (28), −(S ₃ ) _nax = −F′(θ ₄ )ω=S ₀ −N/(C ₃ ) _nio , so (C ₃ ) _nio = N/S ₀ + (S ₃ ) _nax = N/S ₀ + F' (θ ₄ ) ω
(31) Therefore, the range of the winding density C ₃ (T/m) of the sheath thread 2' in the non-multilayer winding portion formed by the raising of the thread guide 22 is given by the following equation.
(See Figure 3) N/S ₀ +F'(θ ₄ )ωC ₃ <N/S ₀ (32) The transmission 26, which is designed to change speeds in an extremely complicated manner, is electrically connected to the induction motor 13. Therefore, induction motor 13
The rotational angular velocity of changes even during one rotation. Therefore, the angular velocity ω (rad/min) in equations (12) and (22) changes even during one rotation of the cam 14. Therefore, the vertical speed of the thread guide 22, that is, the vertical speed of the intertwining point 6 of the sheath thread 2' with the core thread 2, changes from moment to moment for each rotation of the cam 14, and even during one rotation. Change.

The vertical displacement and speed of the entanglement point 6 are determined by the cam 14.
It is determined by the rotational speed of the cam 14, the shape of the cam 14, the configuration conditions of the swing lever 15, etc. The period of the above displacement is one rotation of the cam 14, but the time required for one rotation varies extremely complicatedly depending on the design conditions of the transmission 26 attached to the induction motor 13. The thickness and length of the multilayer winding portion of the twisted and crimped yarn, as well as its distribution, can be made extremely complex.

In addition, in the present invention, the sheath thread 2' in the multilayer winding part
The number of winding layers i was set to be smaller than 8, but as the number of winding layers increases, the thickness of the multi-layer winding portion increases.
Both ends of the multi-layer winding part tend to collapse. Furthermore, as the multi-layer winding section becomes longer, the amount of overfeeding of the sheath thread 2' to form the multi-layer winding section increases significantly, making it difficult to keep such sheath thread 2' from getting tangled. become. Therefore, in the present invention, the number i of winding layers of the sheath yarn 2' is limited to 1<i<8, preferably 2<i<5, and the overfeed rate of the sheath yarn 2' is set to 10 to 300%, preferably 50 to 150. %.

Further, in the present invention, by vertically moving one guide rod 21, the vertically moving the entangling point 6 of the sheath thread 2' with respect to the core thread 2 running in the heater 5 is controlled by each set of 10 to 20 guide rods. Since the process is carried out in the same manner as described above, it is possible to produce a special false twisted crimped yarn having the same thickness and length of the multi-layer winding portion as well as the distribution thereof. The ratio of the lengths of the multilayer winding section and the non-multilayer winding section is determined by the ratio of the range of rotation angle θ (rad) of the cam 14 and the angular velocity ω (rad/min) of the induction motor 13 in each rotation angle range. Depends on. Moreover, the sheath yarn 2' is overfed from the side close to the core yarn 2 running in the heater 5, and the sheath yarn 2' is wound around the outer periphery of the core yarn 2 to form a multilayer winding part. A strong multi-layer winding part can be obtained. Note that when the formed multilayer winding part passes through the false twisting device 8 and is subjected to untwisting and shape heat fixing in the second heater 10, the multilayer winding part is hardly untwisted and becomes a non-multilayer winding part. is mainly untwisted.

Therefore, the multi-layer winding part of the special false-twisted crimped yarn produced by the apparatus of the present invention is extremely strong, so it does not loosen, flow, or form whiskers during the preparation process such as weaving and knitting. There is no fear that a loop will occur.

FIG. 4 is a model diagram of the special false twisted and crimped yarn produced by the production method of the present invention, in which the black thread represents the core thread 2 and the white thread represents the sheath thread 2'. Figure 5 shows
By the manufacturing method of the present invention, a sheath thread 2' is formed around the core thread 2.
FIG. 3 is an explanatory diagram showing a state in which a multilayer winding portion is formed by winding the winding member. The positions of the longitudinal cross-section of the sheath yarn 2' which are to be wound one time, two times, three times, etc. around the core yarn 2 in sequence are a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a ₆ Indicated by...

In the multilayer winding portion formed by the manufacturing method of the present invention, the winding pitch of the sheath thread 2' relative to the core thread 2 is P ₀
(cm) is calculated from equation (3) as P ₀ =1/C=D/i, 1<i<8, preferably 2<i<5, so D/8< _P0 <D, preferably D/5< P ₀ D/2, and the thread guide 22 travels so as to satisfy the above equation. Therefore, when the sheath yarn 2' is wound around the core yarn 2 to the position a ₁ and then comes to the position a ₂ for the second time and is about to be wound, the sheath yarn 2' is wound in the length direction of the core yarn 2. Since the center distance P ₀ (cm) between a ₁ and a ₂ of is P ₀ < D, a ₂ slides down the surface of a ₁ and is arranged at the position of a' ₂ , and the sheath thread 2' is in the first layer. form.

The sheath yarn 2' to be wound next comes to position a ₃ and is about to be wound, but a ₁ and a ₃ in the longitudinal direction of the core yarn 2
The distance between the centers of is 2P ₀ (cm), and when D<2P ₀ <2D, that is, D/2<P ₀ <D, a ₃ slides down the surface of a′ ₂ and reaches the position of a′ ₃ . The first layer of sheath yarn 2' is formed. However, 2P ₀ <D or P ₀ <
At D/2, a ₃ slides down the surface of a' ₂ and is placed at a position a'' ₃ to form a second layer of sheath yarn 2' with respect to the core yarn 2.

Next, when the sheath yarn 2' comes to position a ₄ during the fourth winding, the distance 3P ₀ (cm) between the centers of a ₁ and a ₄ in the length direction of the core yarn 2 becomes 2D < 3P ₀ <3D, that is, 2/3D<P ₀ <D, a ₄ slides down from the surface of a ₁ and comes to the position of a' ₄ to form the first layer of the sheath yarn 2'.

However, when D < 3P ₀ < 2D, that is, when D/3 < P ₀ < 2/3D, a ₄ comes to the position a″ ₄ above a′ ₃ and a′ ₂ , and the second sheath thread 2′ Next, the fifth winding of the sheath thread 2' is at position a ₅ , but in the longitudinal direction of the core thread 2.
The distance between the centers of a ₁ and a ₅ is 4P ₀ (cm), and 3D <
When 4P ₀ <4D, that is, 3/4D < P ₀ <D, a ₅ slides down onto the surface of a' ₄ and comes to the position of a' ₅ , and is placed in the first layer of the sheath yarn 2'.

However, when 2D < 4P ₀ < 3D, that is, D/2 < P ₀ < 3/4D, _a5 slides off the surface of _a''4 and is placed at the position of _a''5 , forming the second layer of sheath yarn 2'. Similarly, when D<4P ₀ <2D, that is, D/4<P ₀ <D/2, a ₅ comes to the position of a ₄ and a third layer is formed. Core yarn 2
The distance 5P ₀ (cm) between the centers of a ₁ and a ₆ in the direction of is 4D
<5P ₀ <5D, that is, when 4/5D<P ₀ <D, a ₆ is placed at the position of a' ₆ to form the first layer, and 3D < 5P ₀ <
4D, that is, when 3D/5<P ₀ <4/5D, a ₆ is placed at the position a″ ₆ to form the second layer of the sheath thread 2′, and further,
When 2D<5P ₀ <3D, that is, 2D/5<P ₀ <3/5D, c ₆ comes to position a ₆ and the third layer of sheath yarn 2' is formed.

In this way, the sheath thread 2' is further divided into a ₇ , a ₈ , a ₉ ,
When the sheath thread 2' reaches the position of a ₁₀ ..., the first, second, third, fourth, fifth... layer of the multi-layer winding part is changed depending on the designed pitch P ₀ (cm). They will be formed sequentially.

Entanglement point 6 of sheath thread 2' and core thread 2 in these cases
The descending speed S ₁ (m/min) is given by equation (4), that is, S ₁ =S ₀ -ND/i, 1<i<8, preferably 2<i<5. Therefore, if the number i of the winding layer of the multi-layer winding part is determined in advance, the thread guide 22 can be lowered to form the multi-layer winding part of the sheath thread 2' having such a number of winding layers i. Speed S ₁ (m/min)
As a result, a multilayer winding portion having a predetermined thickness is formed.
The length of the multilayer winding section is determined by the speed S ₁ (m/
min) to lower the thread guide 22,
It is determined by the rotational angular velocity of the induction motor 13 and the shape of the cam 14.

Therefore, in the present invention, F(θ) and F'(θ) are determined by selecting a predetermined shape of the cam 14, so that the rotational angular velocity of the cam 14 satisfies equation (25). By making the transmission extremely complex, it is possible to produce special false-twisted crimped yarns in which multilayer windings of various thicknesses and lengths are distributed in a complex manner at various pitches.

When the number i of winding layers of the sheath yarn 2' with respect to the core yarn 2 increases in the multi-layer winding section, the overfeed rate of the sheath yarn 2' in the multi-layer winding section increases from several times to several tens of times the feed rate of the core yarn 2. It will be doubled.

Therefore, while the sheath thread 2' forms a non-multilayer winding part, the sheath thread 2' is overfed to make it slack.
It is necessary to maintain sufficient length while forming the next multilayer winding section.

In other words, the required length of the sheath thread 2' is determined by the length of the multilayer winding part, the number of winding layers, and its distribution, so the sheath thread 2' may be overwound while the non-multilayer winding part is being formed. It is necessary to eid it to a sufficient length and leave it slack. Therefore, the length of the multilayer winding section, the number of winding layers, and their distribution are limited by the overfeed rate of the sheath thread 2'. If the overfeed rate of the sheath yarn 2' is increased too much, the slack of the sheath yarn 2' will increase too much until the multilayer winding part is formed. It is determined naturally from the structure. Considering these conditions, in the present invention, the overfeed rate of the sheath yarn 2' is set to 10 to 300%, preferably 50 to 300%.
Limited to 150%.

As mentioned above, in the theoretical consideration of the manufacturing method of the present invention, calculations were made assuming that the cross section of the yarn is circular; however, in reality, it is not necessarily circular, but has various shapes, and its apparent size also varies. It varies somewhat depending on the tension of the yarn. However, in order to facilitate the discussion, we theoretically analyzed the yarn as described above assuming that the cross section of the yarn is circular. The manufacturing conditions were set.

Therefore, it is unavoidable that there are some differences between the structure of the special false-twisted crimped yarn produced and the set manufacturing conditions described above.

Below, four production examples in which special false-twisted crimped yarns were produced by implementing the production method of the present invention will be described.

Example 1 Raw yarn Core yarn: Polyester filament yarn semi-dull
75d/36f Sheath thread: Same as above High shrinkage thread (shrinkage rate 69.5%) 50d/
36f Model: Friction false twisting machine SD-3 False twisting conditions Yarn speed (core yarn): 60 m/min (Yarn running speed) / (Disc speed) = 0.19 Thread guide speed of sheath yarn: +59 m/min ~ -60
m/min Heater temperature 1st heater: 200℃ 2nd heater: 190℃ False twist feed rate Core yarn: +3.0% Multilayer winding part of sheath yarn: 60-130% (variable speed) Non-multilayer winding of sheath yarn Turning part: 8.7-10% Quality of production processed yarn Average thickness: 210d Strength: 1.7g/d Elongation: 28.8% Note: + in the thread guide speed of the sheath thread indicates the running direction of the core thread, and - indicates the running direction of the core thread. Indicates the opposite direction to the running direction of the thread.

Note that f is the number of filaments of the filament yarn.

Example 2 Raw yarn Core yarn: Polyester filament semi-dull high shrinkage yarn (shrinkage rate 55%) 75d/36f Sheath yarn: Polyester spun yarn 80S Model: Friction false twisting machine SD-3 False twisting conditions Yarn speed (core yarn): 55m/min (Thread running speed)/(Disc speed) = 0.23 Thread guide speed of sheath thread: +52.04m/min~
-55m/min Heater temperature 1st heater: 210℃ 2nd heater: 205℃ False twist feed rate core yarn: 3.0% Multilayer winding part of sheath yarn: +50 to 130% Non-multilayer winding part of sheath yarn: +8. 7-10% Quality of production processed yarn Average thickness: 240d Strength: 1.6g/d Elongation: 21.0% Example 3 Raw yarn Core yarn: Polyester filament high shrinkage yarn (shrinkage rate 65%) 50d/24f Sheath yarn: Polyester kakeole filament normal shrink yarn 50d/24f Model: Spindle type false twist crimp processing machine ST-6 False twisting conditions Yarn speed (core yarn): 45m/min Thread guide speed of sheath yarn: +44.3m/min~-
45m/min Number of false twists: 1850T/m Heater temperature 1st heater: 193℃ 2nd heater: 205℃ False twist feed rate Core yarn: +3.0% Multilayer winding part of sheath yarn: +50~160% (Tension 0.8~0.2
g/piece) Non-multilayer winding part of sheath yarn: +8.7~10% Quality average thickness of produced processed yarn: 180d Strength: 1.9g/d Elongation: 26% Example 4 Raw yarn Core yarn: Polyester filament Unrolled yarn (△n=
85×10 ^-3 ) 95d Note: △n is the difference in molecular orientation between the outside and inside of the cross section of the filament Sheath thread: Human silk thread 50d Model: Spindle type false twist crimping machine ST-6 False twisting conditions Yarn speed (core yarn): 4.2m/min Thread guide speed of sheath yarn: +41.3m/min~-
42m/min Number of false twists: 2050T/m Heater temperature 1st heater: 205℃ 2nd heater: 200℃ False twist feed rate Multilayer winding part of sheath yarn: +80~120% Non-multilayer winding part of sheath yarn: ± 0% Quality of production processed yarn Average thickness: 235d Tenacity: 1.8g/d Elongation: 32% The special false twisted crimped processed yarn produced by the manufacturing method of the present invention as described above Since the sheath yarn is tightly wound, there is no risk that the sheath yarn of the formed multi-layered winding portion will loosen or flow from the core yarn, or that whisker-like loops will occur.

The conventional slub-like crimped yarn is manufactured by randomizing the length, thickness, and distribution of the slub-like multilayer winding portion. When such slub-like crimped yarn is used for weaving or knitting, the slub-like portions may be distributed abnormally densely or unevenly on the surface of the manufactured fabric. Therefore, there was a risk that defective fabric would be produced.
According to the manufacturing method of the present invention, the position of the entanglement point of the sheath yarn with respect to the core yarn and the speed of vertical movement can be extremely complicated as designed for each set of 10 to 20 sheath yarns, and each Since the sheath yarn is changed in the same way, it is possible to produce a special false twisted crimped yarn in which strong multi-layer wound portions and non-multilayer wound portions having various lengths and thicknesses are distributed in the same way. .

Therefore, in woven or knitted fabrics using the special false twisted and crimped yarn produced by the production method of the present invention, the distribution of slab-like multilayer winding parts appears as designed, and all fabrics have the same distribution. Since it is possible to manufacture products, there is no risk of producing defective fabrics as in the past.

Furthermore, since the multi-layer winding portion of the special false-twisted crimped yarn produced according to the present invention is formed extremely firmly, sizing,
There is no need to improve the cohesiveness of the filament yarns in the multilayer winding section by twisting or winding another yarn. Moreover, the surface effect of the knitted fabric using the special false-twisted and crimped yarn produced by the production method of the present invention is extremely spun-like, and to be exact, it is possible to obtain a knitted fabric that is very elegant, with a cotton-like and shantang-like appearance. It has remarkable effects such as

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example of an apparatus for carrying out the manufacturing method of the present invention, FIG. 2 is an explanatory diagram of a part of the above-mentioned apparatus, and FIG. 3 is an explanatory diagram of a part of the apparatus in its operating state. , FIG. 4 is a model diagram of the special false-twisted crimped yarn manufactured by the present invention, and FIG. 5 is a schematic diagram of the special false-twisted crimped yarn manufactured by the present invention for forming a multilayer winding portion using the sheath yarn. FIG. 2... Core yarn, 2'... Sheath yarn, 5... First heater, 6... Entanglement point, 8... False twisting device, 10... Second heater, 13... Induction motor,
14...cam, 15...swing lever, 17...horizontal rod, 18,18'...slide bar, 19,1
9'...Support member, 21...Guide rod, 22
... Thread guide, 23 ... Gap between first heater, 24, 24' ... Guide roller, 25 ...
Friction roller, 26...transmission device.

Claims (1)

[Scope of Claims] 1. When false twisting and crimping two or more fiber yarns consisting of a core yarn and a sheath yarn, each core yarn traveling at a constant speed is approached in a heater, and each core yarn is approached from the side. Intermittently overfeed the sheath yarns by 10 to 300%, preferably 50 to 150%, and entangle each sheath yarn with each core yarn in the above heater, so that each sheath yarn for each core yarn The speed of the entanglement point S ₁ (m/
min) is somewhat smaller than the running speed S ₀ (m/min) of each core yarn S ₁ =S ₀ -ND/i 1<i<8 preferably 2<i<5 where N is false twist crimp processing Machine twisting speed (T/
min) D is the diameter of the sheath yarn (μ) i is the number of winding layers at each position of the sheath yarn T is the number of windings of the sheath yarn with respect to the core yarn The strong multilayer winding of each sheath yarn for each core yarn The descending speed of the entanglement point S ₂ when forming a non-multilayer winding part of each sheath thread
(m/min), rising speed S ₃ (m/min), S ₂ = S ₀ −N/C ₂ , −S ₃ = S ₀ −N/C ₃ N/S ₀ <C ₂ ≦1/D, N/S ₀ + (S ₃ ) _nax ≦C ₃ ≦
N/S ₀ Here, C ₂ is the winding density of the sheath yarn when the entanglement point is lowered (T/m) C ₃ is the winding density of the sheath yarn when the entanglement point is raised (T/m) (S ₃ ) _nax is the maximum speed when the entanglement point rises (m/
min), and a set of 10 to 20 sheath yarns is used for each core yarn, and a multilayer winding part and a non-multilayer winding part are formed in the same way by each sheath thread. A method for producing a special false-twisted crimped yarn characterized by extremely complex changes in length, winding density, and number of winding layers as designed.