JPS6223089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing covered yarn from two short fiber rovings and one long fiber yarn using a ring spinning machine.

Conventionally, the method of manufacturing covered yarn using a ring spinning machine is to start from below the front roller.
The polyurethane elastic filament yarn is fed and merged with the short fiber bundle that has been drawn into a belt shape through a collector, and when it is pushed out by the front roller, the filament yarn is unstretched and twisted at the same time, making it stretchable. A method for producing short fiber covered yarn (Japanese Patent Publication No. 40-14256), or a method of supplying double roving to a draft zone and drafting each separately.
In addition to maintaining the separated state of the book, the separated 2
Each synthetic fiber filament core yarn is supplied under tension to the main fiber yarn from above the front roller through a collector, and each of the core yarns and the roving fiber yarn are mixed, Two roving fiber yarns of equal amount on both sides are sandwiched between two synthetic fiber filament core yarns on the left and right sides, and are spun. Immediately after exiting the front roller, they are combined and twisted to create a single yarn structure. A method for obtaining a core yarn with a but,
In the former method, the synthetic fiber yarn serving as the core yarn is limited to elastic yarn, and when spinning using ordinary synthetic fiber filament yarn, only intertwisted yarn of short fibers and filament yarn can be obtained. . Note that although a coated yarn can be obtained under certain conditions (for example, when the mixture ratio of the coated portion is about 90%), in this case, only a yarn in which the coated portion is easily peeled off can be obtained. In addition, in the latter method, two synthetic fiber filament yarns are used and a roving fiber yarn is sandwiched between them to prevent the covering fibers from peeling off and falling off. There are restrictions on the blending ratio and spinning count, and supplying two roving fiber yarns and two synthetic fiber filament yarns in the same draft area requires installation of a feeding device in a narrow space and spinning operations. becomes very complicated.

The object of the present invention is to provide a novel method for producing covered yarn that overcomes the above-mentioned drawbacks of the conventional methods for producing covered yarn. That is, two short fiber rovings are simultaneously supplied to the same back roller of a ring spinning machine, and a long fiber yarn is further supplied between the front roller and the apron, so that the short fiber rovings spun from the front roller are When producing a covered yarn using two pieces of fleece as a covering part and the long fiber yarn as a core part, when looking from the spindle side, the left roving is a and the right roving is b, and the front roller The width Wa of the fleece a′ of the roving yarn a and the width Wb of the fleece b′ of the roving yarn b between the Adjust the distance D so that it satisfies Wa+Wb/4<D≦Wa+Wb, and insert the long fiber yarn C into this distance D, from the center to the fleece a' side in the case of left-handed twist.
In addition, in the case of right-handed twist, each D/5 to the fleece b′ side.
The winding angle θa and the winding angle θa and θb from 37°
This is a method for manufacturing a covered yarn characterized in that the angle is 67°.

The configuration of the present invention will be explained in detail below.

FIG. 1 is a simplified perspective view when the method of the present invention is being carried out, and FIG. 2 is a plan view of the main parts when left-handed twisting is performed. As shown in FIG. 1, when viewed from the spindle side, short fiber rovings a, which will serve as a covering section, are simultaneously fed to the back crawler B of a ring spinning machine, and short fiber rovings a, which will become the covering section, are fed to the right side, and the back crawler B Collectors K ₁ a and K ₁ b are interposed between the roving yarns a and b that have come out of the roving, and the spacing is maintained, and the rovings are fed to the apron E while applying a brake draft, and then the apron E and the front roller F are Give the main draft between. As shown in Figure 2, a collector is installed between the apron E and the front roller F.
By adjusting the widths of K ₂ a and K ₂ b and the spacing between them, the width Wa of the fleece a′ of the roving a passing through them can be adjusted.
and the width Wa of the fleece b' of the roving b, in the case of left-handed twisting, Wa≦Wb, as shown in Fig. 2, and in the case of right-handed twisting, Wa≧Wb, and the distance between them D
is adjusted so that Wa+Wb/4D≦Wa+Wb, and the long fiber yarn C, which will become the core yarn, is fed into the adjusted interval D. In the case of left-handed twisting, the supply position is a position offset from the center of interval D to the fleece a' side within a range of D/5 as shown in Figure 2, and in the case of right-handed twisting, the supply position is a position offset from the center of interval D to the fleece a' side within a range of D/5, and in the case of right-handed twisting,
It is also necessary to position it offset within the range of D/5 from the center of the fleece b′ side. Then, as shown in FIG. Roll it onto the woodwind M. In this case, by adjusting the rotational speed of the spindle S and the weight of the traveler, when the fleece a' spun from the front roller F and the long fiber yarn C are combined at the confluence point Ha, winding angle θa, fleece b′ and long fiber C
and the winding angle θb when the yarns are doubled at the confluence point Hb are set to be 37° to 67°, respectively.

In the method of the present invention, during left-handed twisting, the feeding position of the long fiber yarn C is changed from the center of the interval D to the fleece.
By shifting to the side of a' within the range of D/5, the confluence Ha of the long fiber yarn C and fleece a' formed by the left twisting action of the spindle S is set to the long fiber yarn C. From the confluence Hb with fleece b′,
Move the front roller F closer to the fleece
By winding the fleece a' around the long fiber yarn C earlier than b', it is possible to cover the long fiber yarn C, which becomes the core yarn, with the fleece a' in the form of a twisted yarn. and
By setting Wa≦Wb, the long fiber yarn C covered with the fleece a′ in the form of a twisted yarn as described above
can be completely covered with fleece b'.

In addition, in the case of right-handed twisting, by setting the supply position of the long fiber yarn C to one side and the width of the fleece to the opposite conditions to those in the left-handed twisting, the same as in the case of left-handed twisting can be applied. First, the long fiber yarn C is covered with the fleece b' in the form of a twisted yarn, and then the fleece is covered with the fleece b'.
It can be completely covered by a'.

In addition, in both left-handed and right-handed twists, the spacing D needs to be W ₁ +W ₂ /4<D≦W ₁ +W ₂ , but if D≦W ₁ +W ₂ /4, other conditions are satisfied. Even if it is filled, it will result in poor covering,
If only intertwisted yarns are obtained, and if D>W ₁ + W ₂ , even if other conditions are met, fleece a' and b' will be cut and become speckled yarns, which will eventually become unspun. It becomes impossible to go out.

In addition, the winding angles θa and θb are 37 as described above.
It is necessary to adjust the angle so that it is within the range of 67°, but if θa and θb are smaller than 37°, the valve
The yarn becomes too large and has a lot of fuzz, and the coating part of the yarn tends to peel off and fall off after spinning.
Furthermore, if θa and θb are larger than 67°, even if other conditions are met, poor covering occurs and the yarn becomes twisted, making it impossible to obtain a good covered yarn.

Next, FIG. 3 shows a cross-sectional model diagram of the covered yarn obtained according to the present invention. Covered yarn Y is long fiber c
The figure shows a state in which the core is covered with short fibers ab.

As described above, in the method for manufacturing a covered yarn according to the present invention, a long fiber yarn to be a core yarn is first covered with one short fiber freeze in the form of a twisted yarn, and then this is coated with another short fiber. Freezing of the fibers provides a sufficient and strong coating so that the coating does not peel or fall off, making it possible to easily produce strong, high-quality coated yarn. This is a novel and extremely useful method for producing covered yarn.

The present invention will be further explained below with reference to Examples.

Example 1 As shown in Figures 1 and 2, two 60 ^'s cotton rovings a and b (same gelatin;
80〓/30Yd) is drafted by supplying roving a on the left side and roving b on the right side as viewed from the spindle side, and as shown in Fig. 2, collectors K ₂ a and K ₂ b
The width Wa of fleece a′ and the width Wb of fleece b′ are determined by
, both Wa=Wb=1.5mm, and the distance D between both is D=
Polyester multifilament yarn C (50d/24f) was adjusted so that the distance was 1.0mm, and a polyester multifilament yarn C (50d/24f) was supplied from the rear upper part of the front roller F to a position offset by D/5 = 0.2mm from the center of the distance D toward the fleece a'. . And the fleece a′ spun from the front roller F
b′ and θa = 55° and θb = 53°, respectively, on the polyester filament yarn C (left-handed twist) with Efil/C 34/66 (mixed spinning ratio), 36′ ^s covered yarn. Obtained.

The knitting performance of the coated yarn was investigated using a cotton jersey, and it was found that the coated yarn could be knitted without any problems such as the cotton in the coated portion peeling off or falling off, even when handled by a sinker of a knitting machine. Further, when the physical properties of the knitted fabric were investigated, results were obtained that the dimensional stability was good and the bursting strength was high, indicating the effect of using the filament yarn, which was good.

Example 2 Cotton rovings a and b2 for 40 ^'s blended cotton were attached to the cross roller B.
When looking from the spindle side, roving a is on the left and roving b is on the right.
is supplied, and the width of fleece a′ and b′ is Wa=Wb=2.0
mm, adjust the distance between the two to be D = 1.5 mm, and place a polyester multifilament yarn C from the rear upper part of the front roller F at a position offset by D/5 = 0.3 mm from the center of the distance D toward the fleece a'. (75d/
36f) and separate fleece a′ and fleece b′ with θ
Wrap around the polyester filament yarn C at a winding angle of a = 54° and θb = 51° (left twist),
A coated yarn of Efil/C, 42/58 (blending ratio), 30 ^'s was obtained.

As a result of conducting the same investigation as in Example 1 regarding this covered yarn, it was possible to knit it without causing any problems such as the cotton in the covered portion peeling off due to sinkers or the like. In addition, when the physical properties of the knitted fabric were investigated, the results showed that it had good dimensional stability and high bursting strength, indicating the effect of using filament yarn.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a case in which the method of the present invention is implemented, and FIG. 2 is a plan view of the main part of FIG. 1. FIG. 3 is a cross-sectional model diagram of a covered yarn obtained by the method of the present invention. a, b... roving, a', b'... fleece, c...
Long fiber yarn, Y...covered yarn, F...front roller, B...cross roller, E...apron.

Claims (1)

[Scope of Claims] 1. Two short fiber rovings are simultaneously supplied to the same back roller of a ring spinning machine, and a long fiber yarn is further supplied between the front roller and the apron, so that the When manufacturing a covered yarn using two short fiber rovings as a covering part and the long fiber yarn as a core part, when looking from the spindle side, the left roving is called a, and the right roving is called b. When doing this, the roving a between the front roller and the apron
Width Wa of fleece a′ of and width of fleece b′ of roving b
Wb is adjusted so that Wa≦Wb for left-handed twisting and Wa≧Wb for right-handed twisting, and the distance D between the two becomes Wa+Wb/4<D≦Wa+Wb, and the long fibers are inserted into this distance D. Thread C from the center, towards the a′ side of the fleece for left-handed twisting.
In the case of right-handed twisting, the fleece is fed to the fleece b' side at offset positions within the range of up to D/5, and the fleece a' and long fiber yarn C spun from the front roller, and the fleece b' and long fiber yarn C are The winding angles θa and θb at each confluence point of the fiber threads C are 37° to 67°.
A method for producing a covered yarn, characterized in that: