JPS588131A - Preparing apparatus of bound spun yarn - Google Patents

Abstract

PURPOSE:To obtain bound spun yarns of high quality having a high tenacity with a slight uneveness in the tenacity, by setting the flow rate of air to be sucked in a pneumatic part in a specific range according to the width of conveyor bands. CONSTITUTION:A flow rate of air to be sucked (N) (Nl/min) in a pneumatic part 6 is set to satisfy the relation 6W+50>=N>=2W according to the width W (mm.) of conveyor bands 5 and 5'. The high flow rate of the air to be sucked smooths the air flow in not only the pneumatic part 6 but also conveyor bands 5 and 5', and the transfer effect of a fleece 1 is enhanced to reduce the unevenness in the tenacity with the stabilized bound state of the free fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing bundled spun yarn. More specifically, the present invention relates to an apparatus for producing a bound spun yarn that can stably produce high-quality bound spun yarn that has high strength and has no tenacity floor.

4 The bundled spun yarn produced by the so-called innovative spinning method is
The structure is such that the wrapped fibers are wound helically around the outer periphery of a core fiber bundle made of substantially non-twisted staples. For this reason, the strength of the bound spun yarn is mainly obtained by the winding of the wrapped fibers. However, with conventional devices, it is difficult to evenly wrap the wrapped fibers over the entire fiber, and the strong floor tends to become large.

In particular, for natural fiber blends such as cotton or thick yarns of AoNWL or higher, the strength level becomes even larger, and the main drawback is that the minimum strength becomes low, and the minimum strength may exceed the practical strength. There was an inconvenient problem in that spinning conditions had to be set accordingly.

An object of the present invention is to provide an apparatus for producing bound spun yarn, which eliminates the problems of the conventional apparatus as described above and allows stable production of bound spun yarn having a small strength floor and high tenacity. It is in.

The apparatus for producing bundled spun yarn of the present invention that achieves the above object has the following features:
A draft section that drafts the staple fiber bundle, a conveyor band section that transfers the drafted fiber bundle, a pneumatic section that suctions and transfers the fiber bundle following the conveyor band section, and an air false twist that heats and untwists the fiber bundle. It is composed of a nozzle and a take-up part that takes over the bound spun yarn after formation, and the air suction amount N (NA!/m1m ) of the pneumatic part and the conveyor band width W (WI) of the conveyor band part are expressed by the following relationship. It is characterized by being set to .

6W+50≧N≧2W DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a schematic diagram of an apparatus for producing bundled spun yarn according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes staple fiber bundles (slivers or rovings) aligned substantially parallel to the feeding direction. This fiber bundle 1 is drafted by a draft section 50 composed of a back roller 2, a cradle 3, and 70 rollers 4, 4I to increase the parallelism of the short fibers, and then by a pair of aprons wound around a front roller 4J4', respectively. It is transported by a conveyor band 5.5'. In addition,
This conveyor band 5.5' is the lower conveyor band 5.
′ alone may be sufficient. When provided as a pair of upper and lower conveyor bands (c), the conveyor bands 5.5' move away from each other as they move toward the downstream side of transport from the gripping point of the fiber bundle 1 on the front roller 4° 4', and their gripping force on the fiber bundle gradually weakens. It is configured as follows.

Numeral 6 is pneumonia, which performs the action of actively suctioning and transporting fiber bundles. Air false twisting nozzle 7 is adjacent to this pneumatic
is provided, and the fiber bundle is heated upstream of this air false twisting nozzle 7, and the twist caused by the heating is untwisted again downstream. 8 is a delivery row 2.9 is a package of bundled spun yarn 100 at a take-off section.

The twisting on the upstream side by the air false twisting nozzle 7 is given good parallelism and spreadability by the draft, and extends to the staple fibers in the center of the conveyor band 5.5' of the staple fiber bundle 1, but not to the both sides. This does not immediately apply to staple fibers. The staple fibers on both sides are conveyor band 5.
During the transfer at 5' or after being sent out, the central fiber bundle, which has already been strongly twisted with both ends unrestrained, is twisted with a relatively small number of twists around the outer periphery of the fiber bundle.

When this yarn is untwisted on the downstream side of the air false twisting nozzle 7, the free fibers on the outer periphery are strongly twisted in the untwisting direction, while the core fiber bundle in the center is untwisted to a substantially untwisted state. The bundled spun yarn 100 is formed by spinning.

The conveyor bands 5, 5 function to transport the drafted staple fiber bundle (fleece) 1 to the yarn forming area, and from the viewpoint of efficient spinning, the width of the supplied fleece is set as follows.
Usually Z~% of the width W of the conveyor band is used. The width W of such conveyor bands 5, 5' is selected depending on the spinning count.

In the apparatus of the present invention, a setting is made such that the air suction N in the pneumatic valve is sucked in a larger amount 51 than that generally employed in the past, in accordance with the above-mentioned conveyor pan IIIW. In other words, conventional pneumatic suction has been used to remove fly fluff that does not contribute to yarn formation, or to prevent fleece fed from the conveyor band 5° 5 from scattering when yarn breakage occurs.
It has been considered that it is sufficient to be able to suction and remove the particles so that they do not wind up. However, in the present invention, the suction amount N of the pneumatic material not only has the effect of suctioning and removing unnecessary fibers, but also has the effect of transporting fibers having a small number of unheated free ends by the pneumatic airflow, which are bound to the core fiber bundle. We obtained the knowledge that it affects the condition and affects the strong spots, and as a result, the suction amount N (Nl/min
) in relation to the conveyor band width W (1+111), and by setting 6W+50≧N≧2W, it was possible to obtain a high-quality bound spun yarn with small strength irregularities and high strength.

The amount of pneuma suction N limit set by the above relational expression is larger than what has been generally done in the past, and due to this large amount of air suction, the new air? The air flow inside conveyor bands 5 and 5' as well as inside 6 is smoothed to enhance the fleece transfer effect, and as a result, the state of binding of free fibers is stabilized and a strong bed is reduced.

Figure 2 illustrates the above relational expression, where A is the lower limit,
Further, B indicates the upper limit, and the pneuma suction amount N is set in the shaded area. A
If the air suction amount is smaller than B, the strong bed tends to be large and unstable as before, and if the air suction amount is larger than B, even fibers with free ends that should become wrapped fibers will be suctioned and removed. As a result, the strength of the floor becomes larger and its strength decreases.

Methods for increasing the air suction amount N of Pneuma include increasing the suction force by increasing the capacity of the external negative pressure generator, or increasing the cross-sectional area of the opening leading from Pneuma to the negative pressure generator. There may be. The shape of the new mallow may be a shape that gradually widens toward the conveyor bands 5, 5' as in the embodiment shown in FIG. 1, or a shape parallel to the running fiber bundle. Further, it is preferable to keep the inlet on the conveyor band 5, 5 side of the New Maro in an open state, and the outlet on the opposite air false twisting nozzle 7 side to be in a narrowed state as much as possible to allow the yarn to pass through.

As described above, the apparatus for producing a bundled spun yarn of the present invention includes a draft section that drafts a stable fiber bundle, a conveyor band section that transfers the drafted fiber bundle, and a suction transfer section that follows the conveyor band section. It consists of a pneumatic section for heating and untwisting the fiber bundle, an air false-twisting nozzle for heating and untwisting the fiber bundle, and a take-up section for taking over the bound spun yarn after formation. Conveyor band 11W (1111) of the conveyor band section
By setting the relationship 6W+50≧N≧2W, it becomes possible to stably obtain a bound spun yarn having a small tenacity and high tenacity.

Example 1 A polyester sliver with a single yarn denier of 3d was supplied to the apparatus shown in FIG. 1, and a bundled spun yarn of 'A Nm was spun with a conveyor band width W of 120 m+111 and the amount of pneumatic suction N changed.

Spinning conditions> Draft = 45
Double front roller speed (VF) = 126 m/m
i, n delivery roller speed (vn) ” 120
poff feed rate (N2 dex100) = 5
%pressure Air pressure = 2.5)9/cIf
As a result of measuring the strength of the spun bound spun yarn, the results shown in Figure 3 were obtained.1. The stronger the pneumatic suction amount N increases, the stronger the power becomes, and the stronger the floor becomes smaller, but it is 500 NllN.
It can be seen that after passing around 11 liters, it shows a tendency to gradually worsen.

Example 2 A polyester sliver with a single yarn denier of 3d was supplied to the apparatus shown in FIG. A bundled spun yarn of □Nm was spun.

Spinning conditions> Draft = 90 times Front roller speed -126m/m1n Delivery roller speed = 120 1/Overfeed rate = 5
% - Pressure Air Pressure = 2.5 kg/crIF - As a result of measuring the strength of the spun bundled spun yarn, the results shown in Fig. 41 were obtained. It can be seen that as the pneuma suction amount N increases, both the strong and powerful beds improve, but there is a tendency for them to gradually worsen after reaching a peak around 30 ONl/min.

Example 3 A polyester sliver with a single yarn denier of 2d was supplied to the apparatus shown in FIG. 1, and a bundled spun yarn of 1/4o Nm was spun with a conveyor band width W48■ and a pneumatic suction amount N varied.

Spinning conditions> Draft = SO times Front roller speed == 87.2 rQ/min Delivery roller speed = 80 Overfeed rate
= 9% pressure Air pressure == 362 kg/cIIL
As a result of measuring the strength of the two-spun bundled spun yarn, the results shown in FIG. 5 were obtained. Increasing the amount of pneuma suction N increases the
It can be seen that both the strength spots are good, but they tend to gradually get worse after around 120 ONA/min.

Example 4 A polyester sliver with a single yarn denier of 2d was supplied to the apparatus shown in FIG. 1, and a bundled spun yarn of /84 Null was spun with a conveyor band width W32101 and a pneumatic suction amount N varied.

Spinning conditions> Dra 7) = 80 times 70 Roller speed: 87.2 m/min Delivery roller speed = 80 Overfeed rate =
9% Pneumatic pressure = 3.21r, z As a result of measuring the strength of the spun bound spun yarn, the results shown in Fig. 6 were obtained. Pneuma suction amount 15ONillrni
It can be seen that the strength is maximum near n, but the strength spots gradually become larger after 100Nνi.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a bundled spun yarn manufacturing apparatus according to an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the pneumatic suction amount and conveyor band width in the same apparatus, and Figs. 3 to 6 show different conveyors. FIG. 3 is a relationship diagram of the strength and strength CV of the bound spun yarn with respect to the amount of pneuma suction in the band width. 1... Staple [I bundle, 5.5'... Conveyor band, 6... Pneuma, 7... Air temporary ffi nozzle, 9... Package, 50... Draft section. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] A draft section that drafts the staple fiber bundle, a conveyor band section that transfers the drafted fiber bundle, a pneumatic section that suctions and transfers the fiber bundle following the conveyor band section, and a heating section that heats the fiber bundle. It is composed of an air false twisting nozzle and a take-off part that takes over the bound spinning system after formation, and the air suction amount N (Nl/mlxs) of the pneumatic part and the conveyor band width W (wa) of the conveyor band part are determined as follows. A device for manufacturing bound spun yarn, characterized in that the device is set in the following relationship. 6 W+ 50≧N≧2W