JP2002316771A - Paper tube for winding thread - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper tube for winding thread capable of stably forming an excellent shape of a package and easily unreeling a tail winding part. SOLUTION: The outside diameter of the paper tube at a paper tube body end on the side where a slit groove is provided satisfies the following expression (I). 5>=π×dl-1000×(V/N0)>=0.15...(I) (Where dl is the diameter [mm] of the paper tube at the paper tube body end on the side where the slit groove is provided, V is the winding speed [m/min] of the thread, and N0 is the speed of the paper tube [l/min] at the start of the winding. The end means the center part between the start position of winding and end face of the paper tube).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a synthetic fiber yarn such as nylon or polyester onto a paper tube, stably forming a good package shape, and easily forming a tail winding portion. The present invention relates to a yarn winding paper tube for unwinding.

[0002]

2. Description of the Related Art Conventionally, when synthetic fiber yarns such as nylon and polyester are continuously supplied from a spinning process and automatically wound around a paper tube, the outer diameter of the paper tube main body is constant over the entire length. Formed and corrected within the tolerance range of, and the yarn is wound to form a package shape.

[0003] That is, by using a paper tube in which the outside diameter of the paper tube at the tail winding position formed when the yarn is automatically switched to the main winding position of the yarn is within a certain tolerance range. ,
It suppresses the unstable behavior of the yarn when moving the yarn from the tail winding part to the main winding part, and prevents the turbulence near the paper core and the turbulence of the yarn in the traversing state. -The winding hardness of the winding portion is made appropriate, and the winding portion can be unwound.

[0004] However, in a paper tube in which the outer diameter of the paper tube is uniform within the above-mentioned fixed tolerance range, the folded portion of the yarn is wound above the inner layer at the end of the traverse in the inner layer near the paper tube. There is a problem in winding quality that the yarn is shifted to the end side beyond a predetermined main winding range due to a tightening force or the like of the stacked yarns.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been developed to solve the above problems, and has a good package shape for winding a synthetic fiber yarn such as nylon and polyester around a paper tube. And to provide a yarn winding paper tube which can stably form and wind the tail winding portion easily.

[0006]

In order to solve the above-mentioned problems, a yarn winding paper tube of the present invention has an outer diameter of a paper tube on the side where a slit groove is formed at an end portion of a paper tube main body. (I) is satisfied. 5 ≧ π × d1−1000 × (V / N0) ≧ 0.15 (I) (where d1 is the outer diameter of the paper tube on the side where the slit groove is formed at the end of the paper tube main body [mm] , V is the winding speed of the yarn [m / mi
n] and N0 indicate the number of revolutions of the paper tube at the beginning of winding [1 / min]. The term "end" refers to the center between the main winding start position and the end face of the paper tube. ).

In the yarn winding paper tube of the present invention, when the thickness [mm] of the paper tube satisfies the following expression (II), the package unwinding property and the winding shape can be further improved. Expression can be expected. 10 ≧ t ≧ 3 (II).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The yarn winding paper tube of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic front view of the entirety of one embodiment of the yarn winding paper tube of the present invention. Reference numeral 1 denotes a paper tube main body formed by winding and bonding a strip-shaped base paper in a spiral shape many times, and further pressing the center portion of the paper tube corresponding to the main winding portion. The outer diameter of the paper tube is defined so that the outer diameter (d1) of the paper tube on the side where the slit groove 2 is formed satisfies the above-mentioned formula (I).

FIG. 2 shows an overall front view (comparative example) of a conventional yarn winding paper tube, which is set within a predetermined tolerance range from a predetermined outer diameter (d2) over the entire length. 2 shows a paper tube. In many cases, this tolerance range is set to ± 0.1 mm to ± 0.5 mm regardless of the outer diameter of the paper tube.

In the yarn winding paper tube of the present invention, in order to stably obtain a good package shape, the outside diameter (d1) (mm) of the end of the paper tube and the yarn using the paper tube are used. The following formula (I) is satisfied as the relationship between the winding speed (V) (m / min) of the yarn when winding the yarn and the number of revolutions of the paper tube (N0) (1 / min) at the start of winding the yarn. It is necessary to. 5 ≧ π × d1−1000 × (V / N0) ≧ 0.15 (I).

If the value of π × d1−1000 × (V / N0) exceeds 5 mm, that is, 1 in the tail winding portion
When the yarn length per revolution is 5 mm or more longer than the yarn length per revolution of the main winding set as a winding condition of the winding machine, when the yarn is wound on a paper tube, a tape is required. Immediately after the yarn has moved from the winding part to the main winding part, the yarn tension decreases and unstable behavior occurs on the yarn, and it expands. It is not possible to obtain a suitable package shape. In addition, the tail winding is wound tightly, making it difficult to unwind the tail winding.

On the other hand, π × d1−1000 × (V / N0)
When the value of (hereinafter, referred to as formula A) is less than 0.15 mm, that is, the yarn length per one turn in the tail winding portion and the winding condition set by the winding machine. If the difference from the yarn length per winding is less than 0.15 mm,
When winding the yarn around the paper tube, the folded portion of the yarn at the traverse end (returned portion) in the inner layer near the paper tube is caused by the tightening force of the yarn wound on the upper side of the inner layer. Therefore, it is shifted to the end side beyond the range of the predetermined main winding portion, and a stable and good package shape cannot be obtained.

In the yarn winding paper tube of the present invention,
The thickness t (mm) of the paper tube is 10 ≧ t ≧ 3, that is, 3 mm
It is preferable to set it to 10 mm or more. By setting the thickness of the paper tube in the above range, the above formula (I) can be stably maintained when the concave portion is formed by pressing the main winding portion.

Next, with reference to FIG. 3, an example of a use mode of the yarn winding paper tube of the present invention will be described. At the time of bobbin replacement, the yarn A which is continuously supplied from the previous step and rotates through the peripheral surface of the paper tube main body 1 is captured and cut by the slit groove 2 while rotating the paper tube main body 1. Thereafter, the yarn A is wrapped around the end where the slit groove 2 is engraved to form a tail winding portion B, and then the main winding portion C is moved and traversed under predetermined winding conditions. Form a package.

After the package is formed, the yarn A wound around the tail winding portion B is unwound to improve the workability of connecting the tail in the subsequent process. Then, the tail is re-circulated around the end where the slit groove 2 is engraved, and the yarn end is fixed to the paper tube 1 with a tape or the like. A good package shape can be stably obtained by setting the outer diameter of the paper tube to a condition that satisfies the above expression (1), and further, by setting a condition that satisfies the expressions (1) and (2). And the unwinding of the tail can be facilitated.

[0016]

EXAMPLES The yarn winding paper tube of the present invention will now be described in detail with reference to examples. Each physical property value in the above description and in the following examples is specifically a value measured by the following method. [Fineness] It was measured according to JIS L-1013.

[Package Shape] The appearance of the rolled cheese package foam was visually observed and relatively evaluated as follows. ◎: Extremely good ○: Good △: Slightly poor ×: Poor.

[Tail Release Property] The yarn end of the wound cheese was gripped by hand, pulled in the axial direction of the paper tube, and relatively evaluated as follows. ◎ ・ ・ ・ Easy unwinding ○ ・ ・ ・ Unwinding possible △ ・ ・ ・ Unwinding possible, but single yarn breakage × ・ ・ ・ Unwinding impossible.

[Examples 1 to 3, Comparative Examples 1 and 2] The yarn winding paper tube of the present invention has the shape shown in FIG. It is a paper tube. This was used in a polyester fiber winding process. Stretching conditions and winding conditions were as shown in Table 1. As a result, in Examples 1 to 3, it was confirmed that a good package shape was obtained and the unwinding of the tail was also good. On the other hand, Comparative Example 1,
Sample No. 2 was defective in package shape and unwinding of the tail was also defective.

[Comparative Example 3] A process of winding a polyester fiber using a paper tube having the shape shown in FIG. 2 and a paper tube having an outer shape and a wall thickness shown in Table 1 is used. Applied to
Stretching conditions and winding conditions were as shown in Table 1. As a result, both the package shape and the unwinding of the tail were poor.

[0021]

[Table 1]

[0022]

According to the present invention, the folded portion of the yarn in the pole inner layer near the paper tube, which is generated in the paper tube having the same outside diameter within a certain tolerance range, is formed by the predetermined main winding portion. It is possible to form a stable and good package shape by solving the problem of the winding quality that is shifted to the end side beyond the range, and it is possible to easily unwind the tail winding portion.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an embodiment of a yarn winding paper tube of the present invention.

FIG. 2 is a schematic front view of a conventional yarn winding paper tube used in Comparative Example 3.

FIG. 3 is a side cross-sectional view showing one mode of a yarn winding state when the yarn winding paper tube of the present invention is used.

[Explanation of symbols]

 1: Paper core body 2: Slit groove A: Thread B: Tail winding part C: Main winding part d1: External dimensions of paper core end part d2: External dimensions of main winding part

Claims (2)

[Claims] 1. A yarn winding paper tube characterized in that the outside diameter of the paper tube on the side where the slit groove is formed at the end of the paper tube main body satisfies the following formula (I). 5 ≧ π × d1−1000 × (V / N0) ≧ 0.15 (I) (where d1 is the outer diameter of the paper tube [mm] on the side where the slit groove is formed at the end of the paper tube body, V is the winding speed of the yarn [m / mi
n] and N0 indicate the number of revolutions of the paper tube at the beginning of winding [1 / min]. The term "end" refers to the center between the main winding start position and the end face of the paper tube. ) 2. The yarn winding paper tube according to claim 1, wherein the thickness t [mm] of the paper tube is defined by the following formula (II). 10 ≧ t ≧ 3 (II)