JPS59108656A - Carbon fiber package - Google Patents

Abstract

PURPOSE:To prevent the windings of a carbon fiber package from collapsing and reduce its fluff and the cuts of its yarn, by winding the yarn so that it has a discrepancy of 50 to 150% of its mean width from the already wound yarn for every one to nine traverses. CONSTITUTION:Before a yarn is wound on a bobbin by a winder, the crossing angle and discrepancy of the yarn on the surface of the bobbin and the winding ratio of the winder are set at predetermined values. The yarn 1 is wound to have a discrepancy of 50 to 150%, preferably 75 to 125%, of the yarn width from the already wound yarn so that a crossing pattern 3 appears on the surface of a package.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon fiber package, and particularly to a carbon fiber package in which the occurrence of fluff and thread breakage during unrolling and unwinding is significantly improved.

Today, carbon fiber is attracting attention as a base material for forming composite materials by integrating it with a matrix made of resin or gold maple, etc., and it can be said that such composite materials have reached the stage of practical application. Today, the mainstream is to use acrylonitrile fibers or pitch fibers as raw materials, and these fibers are fired in an oxidizing atmosphere and then heated in an inert atmosphere. It is customary to carbonize by heating.

Now, when the carbon fiber obtained in this way is normally wound onto a bobbin as a cheese-like (software end type) package, the physical properties of carbon fiber are significantly different from those of general synthetic fibers, especially Young's modulus. is high, has low elongation, is weak against bending, and has an extremely smooth surface;
1b, it is difficult to manage the winding of the package, especially the tension management. For example, when winding carbon fiber at low tension, the winding tends to collapse, and when the tension is high, it is easy to cause line breakage and thread breakage. was there.

For this reason, various proposals have been made regarding the winding conditions for carbon fiber packages.

On the other hand, the usefulness of the carbon fiber has been recognized in the market, and the demand for it is increasing. With the increase in demand for carbon fiber, carbon fibers are being made into so-called large packages (for example, 9/package in 1 to 10), in which the amount of carbon fibers is increased.

However, there are two problems with large packaging of carbon fiber.
There is one. One of these is that, as mentioned above, due to the inherent characteristics of carbon fiber, it is difficult to wind it into a package with a large amount of thread without causing collapse, and on the other hand, the rolled up package is particularly difficult to handle during handling. The problem is that the rolls tend to collapse during transportation. Packages that are prone to unrolling, and packages that have unrolled before being unrolled, tend to have fuzz and thread breakage when unrolling. Naturally, the quality of materials varies greatly.

The present invention aims to reduce as much as possible the fuzz and thread breakage that occur when the package is unwound, by winding the fiber into a package that does not collapse when making large packages of carbon fibers. The configuration of the present invention to achieve this objective is as follows.

In a square-end package (hereinafter simply referred to as a package) in which carbon fiber yarn is wound on a bobbin at a predetermined wind ratio, the yarn is wound with respect to the already wound yarn every 1 to 9 traverses. , 50 to 50 of the yarn average width
A carbon fiber package that is wound to give a 150% deviation (hereinafter referred to as yarn deviation width).

Hereinafter, the present invention will be specifically explained based on the drawings.

FIG. 1 is a sketch of a carbon fiber package according to the present invention;
Figure 2-1 is an enlarged view of the double cross pattern that appears on the surface of the carbon fiber package in Figure 1 (however, the thread deviation width is 50%).
Figure 2 is an enlarged view of the cross-shaped pattern (however, the thread deviation width is 150%) that appears on the surface of another carbon fiber package.

Carbon fiber yarn (hereinafter simply referred to as yarn) 1 is continuously wound as a package onto a bobbin 2 while being traversed under a predetermined wind ratio by a normal winding machine (not shown). .

At this time, the yarn 1 is wound on the bobbin 2 every 1 to 9 traverses so as to give a yarn deviation width of 50 to 150%, preferably 75 to 125%, with respect to the already wound yarn, A parallel cross pattern 6 appears on the surface of the resulting package.

In such a package, specifying the thread deviation width is most important in order to achieve the intended purpose of the present invention.

In other words, when the yarn deviation width is less than 50%, that is, when the degree of overlap between yarns is 5 or more of the yarn width, the yarns become too entangled with each other, and fluff and yarn breakage occur during 1vr sewing. easy. Moreover, since the unrolling becomes uneven, the winding density of the package is reduced, and the unrolling is more likely to occur.

On the other hand, if the yarn shear width exceeds 150%, that is, the distance 4 between the yarns becomes 5 or more of the yarn width, as mentioned above, due to the inherent characteristics of carbon fiber, winding collapse is likely to occur, especially in larch packages. .

It is desirable to select this yarn deviation width appropriately depending on the thickness of the yarn (total denier), for example, 6.000.
For denier yarn, 50 to 100% of yarn deviation width, 6.0
Just as a range of 100 to 150% of the yarn shear width is suitable for a 00 denier yarn, it is desirable to increase the yarn shear width as the thickness of the yarn increases.

Next, one aspect of winding the yarn into the package will be described.

In order to wind a yarn with a yarn width Y (tomo) on a bobbin with a total outer diameter of 1)o (tomo) and a traverse width L (tomo) using a normal winding machine, start the winding of the square yarn. Set the winding angle θ and thread deviation width y (y) on the bobbin surface in , set the winding ratio W1 of the winding machine under these conditions, and set the winding ratio W
Winding of the yarn is carried out under l.

Here, the wind ratio Wl is the number of revolutions of the bobbin per traverse in the winder, and can be given by the following equations (1-(3)).

However, Wo is the wind ratio when the yarn width Yi is not considered.

However, dw is the deviation of the original wind ratio of the yarn deviation width y.

WO2 is the integer value closest to Wo determined from equation (1).

Wl=WO-d w・・・・・・・・・・・・・・・
(3) In this case, it is desirable to design so that the winding angle θ is usually in the range of 10 to 30°C (winding angle at the end of winding: 4 to 120 degrees). This is because if the winding angle is too thick, peaks (ears) are likely to be formed at both ends of the traverse, causing damage to the thread, while if the winding angle is too small, the winding is likely to collapse.

Now, wind the second thread in the thread onto a bobbin with an outer diameter of 82 mm and a traverse width of 152 mm, with a winding angle of 15 degrees and a thread deviation of 75% (1.5 m1).The wind ratio is VV+.
The id will be as follows.

7:4.4 = 0.0043 W, = 4.4 to 0.0043 = 4.3957 Therefore, when winding is performed using a winding machine adjusted so that Wl is 4.5957, the yarn A pan cage with a deviation width of 75% is obtained. Note that the wind ratio in the winder is usually adjusted by means of a gear.

Next, the present invention will be specifically explained using examples.

Example Two types of acrylic fibers (yarn average width: 2.OU and 4.OU)
Ovn) fWhen winding with a normal winding machine, the amount of thread deviation is changed to improve the winding shape and unwinding property of the resulting package.
P solid. As a result, as shown in the table, the obtained package is a package Nnl with a thread deviation of 50 to 150 mm.
Only in No. 2 and No. 4, both the winding form and the unwinding property were good.

Below Margin As mentioned above, the carbon fiber package of the present invention has an average width of 5% compared to the yarn already wound at the time of winding.
The yarn deviation width is specified to give a deviation of 0 to 150%, and as a result, the resulting package is less likely to collapse, and the occurrence of fluff and yarn breakage that occurs during unwinding can be significantly reduced. In particular, these effects are remarkable in large packages of 2 to 7 per package or more.

[Brief explanation of drawings]

Fig. 1 is a sketch of the carbon fiber package according to the present invention, Fig. 2-1 is an enlarged view of the parallel cross pattern (however, thread deviation width is 50%) appearing on the surface of the carbon fiber package in Fig. 1, and Fig. 2-2 is It is an enlarged view of a cross-shaped pattern (however, yarn deviation width is 150%) appearing on the surface of another fiber package. 1: Thread 3: Cross pattern 2: Bobbin 4: Spacing between threads 2nd figure a

Claims (2)

[Claims] (1) In a square-end package in which carbon fiber yarn is wound on a bobbin at a predetermined wind ratio,
A carbon fiber package in which the yarn is wound so as to give a deviation of 50 to 150% of the average width of the yarn from the already wound yarn every 1 to 9 traverses. (2) The wind ratio is 10 to 5 for the winding angle of the yarn at the beginning of winding.
00, and the winding angle of the wound yarn is selected to be 4 to 12 degrees.