JPS6137670A - Bobbin package and releasing method - Google Patents

Abstract

PURPOSE:To reduce the end breakage times and the abnormal tension occurring times considerably when releasing with speed higher than 600m/min. by providing a bobbin package having such potential tendency as the false twist yarn will roll to the opposite side from the advancing direction through its torque. CONSTITUTION:When performing Z-release of Z false twist finished yarn 1a having Z torque, said yarn 1a will roll through Z torque on the surface of bobbin package 1 in the arrow direction P or in the opposite direction from the advancing direction of said yarn 1a. While when releasing S false twist finished yarn 3a having S torque, said yarn 3a will roll through S torque on the surface of bobbin package 3 in the arrow direction P or in the opposite direction from the advancing direction of said yarn 3a. Consequently, when the false twist yarns 1a, 3a to be released will slide against the lug sections 1c, 3c at the releasing side of bobbin packages 1, 3, mutual interference between the lug section and the false twist yarn is hard to occur resulting in reduction of resistance against the false twist yarn at the lug section.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is applicable to winding yarn packages in which false twisted yarn is wound while traversing in the axial direction of tubes, such as looms, circular knitting machines, warping machines, etc. The present invention relates to a winding package suitable for unwinding at a high speed of 600 m/win or higher, and a method for unwinding the same.

(Prior art) Thread packages such as straight cheese, skeya corn, increased corn, and pineapple corn are wound by winding the thread while traversing it in the axial direction of the tube. In this method, the thread package is fixed by inserting the center hole of the tube into the fixing peg, and the thread is pulled out in the axial direction of the tube to unravel the thread package. Regarding the direction of pulling out the false twisted yarn from the 1-wound yarn package cage, see Hirohisa Nara and Katsuzo Yasuzuka, "Filament Processing Technology Manual (Volume 2)" (Showa 51.Il, 15, Japan Society of Textile Machinery Engineers, pp. 145-14).
As described in 6), if the winding package is untwisted in such a way that the direction of the twist (untwisting) produced by unwinding is opposite to the false twisting direction, the false twisting will occur due to the residual torque. It is known that since the processed yarn is smoothly separated from the wound yarn package, the unraveling performance is improved. That is, the fifth
As shown in the figure, when the yarn package 1 in which the Z false twisted yarn 1a is wound around the tube 2 is unraveled, the untwisted Z false twisted yarn 1a is untwisted in the S direction. The added S unraveling is appropriate, and as shown in Fig. 6, the S false twisted yarn 3a
When unwinding the wound yarn package 3 wound around the tube 4, it has been considered appropriate to use Z unwinding in which untwisting in the Z direction is added.

On the other hand, when winding the false twisted yarns 1a and 3a around the tube 2.4 to form a wound yarn package 1.3, as shown in FIG. Since the yarn guide 5 was traversed, folded portions 1b and 3b were formed in which the false twisted yarns 1a and 3a were curved in an arc shape at both ends of the traverse, and the wound yarn packages l and 3
The ear parts 1c and 3c of the ear are raised and become taller,
Tube 2.4 compared to the traverse width of yarn guide 5
The traverse width of the upper false twisted yarns 1a and 3a becomes slightly narrower, and as a result, the winding tension at both ends of the yarns 1 to 1 is loosened, causing the false twisted yarns 1a and 3a to develop crimps or open. There is.

(Problem to be solved by the invention) In the conventional method, the untwisting is done in the opposite direction to the false twisting direction, that is, in the same direction as the untwisting direction during the false twisting process. Since the textured yarns 1a and 3a have a torque in the false twisting direction, the false twisted textured yarns 1a and 3a are
rolls on the surface of the wound yarn package 1.3 in the unraveling direction (direction of arrow Q in FIG. 5, direction of arrow Q in FIG. 6) and spreads the yarn. Therefore, recently, high-speed fabric making machines such as high-speed knitting machines and jet looms have appeared, and winding yarn packages 1
is unraveled at a high speed of 600 to 1200 m/mj, n, and as the winding speed increases, the winding package 1.3 is made into a large package, and the traverse width when forming the winding package becomes wider to 20 to 25 cm. Furthermore, when false twisting is performed using POY, the actual twists of the false twisted yarns 1a and 3a are completely eliminated, and the fibers become easy to unravel. The false twisted yarns 1a, 3a are unraveled due to the fact that the winding yarn package E, 3 is loosened at the ears 1c, 3c, making it easier to spread.
causes mutual interference with the surface layers of winding packages l and 3,
There was a problem in that the fluctuations in the unraveling tension became large due to entanglement and pulling, resulting in frequent yarn breakage, which lowered the operating rate of the high-speed cloth making machine and lowered the quality of the resulting knitted fabric. .

(Means for Solving the Problems) In order to solve the problems described in -1-, the present invention provides a wound yarn package in which a false-twisted yarn is wound, wherein the false-twisted yarn is To provide a wound yarn package characterized by having a latent property of rolling in the opposite direction to the pulling direction. In addition, when untwisting the false-twisted yarn from the wound yarn package at a high speed of 600 m/min or more, the above-mentioned wound yarn package has the potential for the false-twisted yarn to roll toward the opposite side of the pulling direction due to the torque. To provide a method for unraveling a wound yarn package, which is characterized by using a wound yarn package having such properties. That is, when untwisting the false twisted yarn from the wound yarn package at a high speed of 600 m/min or more, the wound yarn package 1 of the two false twisted yarns 1a is unraveled by Z untwisting and S false twisting as shown in FIG. Processed yarn 3a
The winding thread 3 is unwound as shown in FIG. 2. When installing 4, reverse the direction of the conventional one.

(Function) 2 false twisting with Z torque] - Since the yarn 1a is Z-twisted, the Z false twisted yarn 1a has a
The Z torque causes the surface of the yarn to roll in the direction of arrow P, that is, in the opposite direction to the direction in which the Z false twisted yarn 1a is pulled out. Furthermore, since the S false twisted yarn 3a having the S I-lux is S-unwound, the S false-twisted yarn 3a is applied to the surface of the wound yarn package 3 in the direction of the arrow P by 81-lux, that is, the S false twisted yarn 3a. It tries to roll in the opposite direction to the direction in which it is pulled out. Therefore, the untwisted [two threads], a, 3
a is the selvedge on the unraveling side of the winding package 1.3】C13c
When making sliding contact with the ears 1c, 3c and the false twisted yarn 1a,
Mutual interference with 3a is less likely to occur, so the ears],
The resistance effect of c and 3c on the false twisted yarns ia and 3a is reduced.

(Example) A triaxial friction type stretching false twisting machine (
Z false twisted yarn 1a of 75 denier 36 filaments was subjected to false twisting at a yarn speed of 600/min, a draw register of 1.5, a heater temperature of 205° C., and a ratio of the peripheral speed of the friction disk to the yarn speed of 2.0. and S false twisted yarn 3a, each using a winder (Traverse 27705/m
J, N, edge breaking amount 8mm, traverse change 10%), winding on a parallel tube, traverse width 250w at the beginning of winding
n, winding traverse width 180+nm, winding diameter 235m,
A wound package 1.3 having a surface hardness of 75 degrees was obtained.

Next, perform S unwinding and 2 unwinding for the above two types of winding packages 1.3, respectively, and adjust the number of thread cuts and unwinding tension of 1.5 kg or more by changing the unwinding speed. The number of occurrences of abnormal tension was measured and shown in the graphs of FIGS. 3 and 4.

Note that curve 1 "Example" is the measured value when the winding package 1 of 2 false twisted yarn 1a is unwound and the S false twisted yarn 3a.
The curve "Comparative Example" shows the average value of the measured value when winding package 3 of Z-folded yarn 1a is unrolled in S, and the curve "Comparative Example" is the average value between the measured value when winding package 1 of Z false twisted yarn 1a is unwinding in S. The average value of the measured value when the wound yarn package 3 of the twisted yarn 3a is unzipped is shown.

Further, the number of thread cutting times is the number of times per 5 kg of yarn amount of the false-twisted yarn, and the number of occurrences of abnormal tension is the number of times per unraveling length of the false-twisted yarn of 6×10'm.

As is clear from a glance at Figures 3 and 4 above,
At an unraveling speed of 500 m/min, no difference was observed between the example and the comparative example in both the number of thread breaks and the number of occurrences of abnormal tension; however, when the unraveling speed exceeded 600 m/min, the comparative example The difference between the comparative example and the example becomes larger as the loosening speed increases, and when the loosening speed reaches 1200 m/mj n, the number of thread breaks and abnormal tension increase. The number of occurrences in both examples is less than half that in the comparative example.

(Effects of the Invention) The number of thread breaks and the number of occurrences of abnormal tension when unraveling is performed at an unraveling speed of 600 m/min or more is significantly reduced compared to the conventional method. Therefore, when applied to a high-speed knitting machine or a jet loom where the wound yarn is unraveled at an unwinding speed of 600 m/min or more, the operating rate is increased and the quality of the product is improved.

[Brief explanation of the drawing]

1 and 2 are front views of a wound yarn package illustrating an embodiment of the present invention, FIGS. 3 and 4 are graphs showing experimental results, and FIGS. 5 and 6 are graphs showing the conventional solution. FIG. 7 is a front view of the winding thread cage showing a state in which the winding thread is in a closed state, and FIG. 7 is a partially enlarged view of the winding thread package. +a: Z false twisted yarn, 3a: S false twisted yarn, 1.3: wound yarn package, 2.4: tube, 5: yarn guide.

Claims (1)

[Scope of Claims] [1] A wound yarn package in which a false twisted yarn is wound,
A wound yarn package characterized in that the above-mentioned false twisted yarn has a latent property of rolling toward the opposite side of the drawing direction due to the torque thereof. [2] 600m/mi of false twisted yarn from the wound yarn package
When unraveling at a high speed of n or more, a wound yarn package is used as the above-mentioned wound yarn package, which has the potential property that the false twisted yarn will roll in the opposite direction to the pulling direction due to its torque. A method for unraveling a wound thread package, characterized by the following.