JPS5943566B2 - Manufacturing method of composite yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a composite yarn having a two-layer structure in which polyester fibers are surrounded by cotton fibers.

Polyester fiber, which has features such as thermoplasticity, quick drying, and compressive elasticity, has drawbacks such as generation of static electricity due to its hydrophobicity and lack of sweat absorption, so it should be covered with cotton fiber, which has excellent moisture absorption and dyeability. Attempts to compensate for length and shortness using the following method have already been known.

Regarding the manufacturing method of such composite yarn, Japanese Patent Publication No. 56-11775
In the publication, a sliver of polyester fiber to be the core is fed to the outside as seen from the flyer head of a roving frame, and a sliver of cotton fiber to be the covering to the inside is fed from a back roller in a co-moving state, and the front roller A method is disclosed in which the fiber is bent at an oblique angle of 0 to 600 to reach the flyer of a roving frame, and the core fiber is covered with a covering fiber during this time.

However, in this method, as described in the above publication, in order to completely cover the core sliver with the sliver, the spinning force of the core sliver must be higher than that of the sliver. In addition to being difficult to manage in that the sliver does not flow, it is also inconvenient in that it requires a draft portion roller width that is large enough to feed both slivers simultaneously.

Furthermore, in Japanese Patent Application Laid-Open No. 55-116824, polyester fibers, which are core fibers in the form of rovings, are fed between the back roller and surf roller of a roving machine, or between the third roller and second roller, and then passed through the roving machine. A method is disclosed in which the cotton fiber slivers are overlapped approximately in the center, and then the two are drafted together, and after coming out of the front roller, they are brought straight to the flyer of the roving machine, during which time the polyester fiber rovings are covered with the cotton fibers. ing.

However, this method has the drawback that the polyester fiber roving serving as the core portion tends to not be drafted because the twist break is incomplete.

It can be said that it is much easier to handle the core polyester fiber in the form of roving than in the form of sliver due to the mechanism of the roving machine.

Therefore, the inventors of the present invention have been conducting intensive research on a more excellent manufacturing method in this case.

As a result, we determined the interrelationship of the twisting directions of the polystellate fiber yarn and composite roving, which form the core, as well as the overlapping position of where the polyester fiber roving should be overlapped with respect to the width of the cotton fiber sliver. It was found that the effect was greatly influenced by

The present invention has been completed based on the above findings.

The present invention will be described below with reference to the drawings.

The cotton fiber sliver A that will become the covering part is supplied from the supply roller 1, passes through the trumpet 2, and then is placed between the back roller 3 and the third roller 4, and between the third roller 4 and the second roller 5.
and between the second roller 5 and the front roller 6.

On the other hand, the polyester fiber roving B that will become the core is fed from the rear of the second roller 5 after passing through the trumpet 7, which is positioned as described below, and is laid on the flattened cotton fiber sliver A, and then the second roller 5 and the front roller 6 together with the cotton fiber sliver A.

In this way, the composite sliver in which the cotton fiber sliver A and the polyester fiber roving B are overlapped has an axis Y-Y'
The yarn is bent at an oblique angle θ relative to the yarn and twisted while reaching the flyer 8 to obtain the desired composite roving C.

The present invention is a composite yarn manufacturing method in which the above-described composite roving is manufactured and then the composite roving is spun, and is characterized by the following two points.

That is, the first point is that the twisting direction of the composite roving C is opposite to the twisting direction of the polyester fiber roving B.

For this reason, the polyester fiber roving B is S-twisted and the composite roving C is 2-twisted, or the polyester fiber roving B
The composite roving C has two twists, and the composite roving C has S twist.

The second point concerns the position of the trumpet 7, in other words the feeding position of the polyester fiber roving B which is superimposed on the flattened cotton fiber sliver A.

The diagonal direction of the composite sliver is as shown in Figure 3-A when manufacturing a Z-twisted composite roving, and as shown in Figure 3-B when manufacturing an S-twisted composite roving. In the invention, the width of the cotton fiber sliver A is divided into three equal parts, and the part of the sliver on the same side as the diagonal direction is called A, the part of the sliver in the center is called the opening, and the part of the sliver on the opposite side to the diagonal direction is called C. Therefore, the trumpet 7 is installed at a position corresponding to approximately the center of this sliver portion C, and the feeding position of the polyester fiber roving B is determined in this way.

The oblique angle θ at which the composite sliver obliquely travels from the nip point of the front roller 6 is determined from the related dimensions of the roving frame itself, but it can generally be said to be in the range of 25° to 60°.

If the twist coefficient of the polyester fiber roving B is 0.38 or less, the tension when the polyester fiber roving B suspended from the bobbin banger is pulled out tends to cause it to come loose.
In addition, if the twist coefficient is 0.66 or more, draft defects will occur during spinning of the obtained composite roving C, so the twist coefficient should be 0.40 to 0.40.
The range is preferably 0.65.

As mentioned above, in the present invention, since the twisting direction of the composite roving C is opposite to the twisting direction of the polyester fiber roving B, the roving B is untwisted when it leaves the nip point of the front roller 6. Since it tends to back, the biting and intertwining with the cotton fiber sliver A is good, and therefore there is no phenomenon of drafting during spinning.

On the other hand, if the twisting direction of both braided yarns B and C is the same, not only the back of the roving yarn B described above cannot be expected at all, but also the twisting of the roving yarn B will be strong (because it will become similar to the cotton fiber sliver A). This causes problems such as poor drafting and frequent occurrence of slabs during spinning.

Next, in the present invention, among the parts of the sliver obtained by dividing the width of the cotton fiber sliver A into three equal parts, the part of the sliver on the opposite side to the diagonal direction of the composite sliver coming out from the front roller 6 is approximately at the center of the part C. is the feeding position of the polyester fiber roving B from the second roller 5, so the structure of the obtained composite roving C is such that the roving B completely occupies the center and the cotton fiber sliver A uniformly surrounds it. It can be coated.

This means that the spinning force of the composite sliver coming out of the front roller 6 and reaching the flyer 8 is higher than that of the central sliver part A on the same side as the diagonal direction of the composite sliver, and more than that of the central sliver part A. This is because the portion of the sliver on the side opposite to the oblique direction C is high, so the portion of the sliver having a higher tension is wrapped around the portion of the sliver having a lower tension and is completely covered.

On the other hand, if the roving B is supplied to a portion of the sliver A, the roving B is biased so that it is exposed on the surface of the composite roving C.

Also, if a part of the sliver is supplied to the mouth, the composite roving C
Even though it is not as noticeable as it appears on the surface, it can only be obtained that is off-center and biased to one side.

Examples of the present invention are shown below.

Cotton fiber slivers A and 1.3 with an average fiber length of about 30 mm
DX38mm, twist coefficient 0.51, roving weight 45 gelen/
Prepare 15 yards of S-twisted polyester fiber roving B, use the apparatus shown in Figures 1 and 2, set the oblique angle θ to 45°, and change the twist coefficient by twisting 2 twists with the flyer 8. Composite roving C with a weight of 0.36 and a roving weight of 180 gelens/15 yards was obtained.

In this case, in addition to the case where the insertion position of the polyester fiber braid B from the second roller 5 was set at the center of the sliver part A and the mouth as described above according to the present invention, as a comparative example, a sliver part A and the center of the mouth were made and commercially available. When a dyeing test was carried out using a dye (Household Dyes Directly Miya Furusu #4011 manufactured by Katsuraya Co., Ltd.), it was found that in the product of the present invention, there were almost all polyester fibers in the core that were not dyed by the above dyes, and dyed cotton fibers In contrast, with products other than the products of the present invention, the undyed polyester fibers were scattered on the surface of the dyed coated yarn, and even though it was not so much, it was unevenly distributed on one side. Ta.

The composite roving C, which is a product of the present invention, is spun to 7S (English cotton count).
was spun, but it was possible to spin it without experiencing the phenomenon of not being drafted during spinning.

When the roving B was spun in the same manner as described above with twist coefficients of 0.36 and 0.66, the following results were obtained.

[Brief explanation of the drawing]

The figures relate to the present invention, and FIGS. 1 and 2 are plan and side views of apparatus suitable for carrying out the invention. Moreover, FIG. 3-A and FIG. 3-B are plan views showing the overlapping position of polyester fiber rovings. 5...Second roller, 6...Front roller, 8...Flyer, A...
Cotton fiber sliver, B: polyester fiber roving, C: composite roving, C: part of the sliver on the opposite side.

Claims (1)

[Claims] 1. A composite sliver obtained by stacking a polyester fiber roving B serving as a core portion supplied from the rear of the second roller 5 of the roving frame on a cotton fiber sliver A serving as a covering portion passed through the roving frame is fed diagonally from the front roller 6. In this manufacturing method, the feeding position of the roving B is such that the width of the cotton fiber sliver A is approximately divided into three equal parts. The part of the sliver on the side opposite to the diagonal direction of the sliver thus obtained is placed approximately at the center of C, and the twisting direction by the flyer 8 is opposite to the twisting direction of the roving B. A method for manufacturing composite yarn.