JPH08170230A - Production of double layered yarn - Google Patents

Abstract

PURPOSE: To obtain an uniform double layered yarn which is stable in covered state by winding a sliver forming a core part in a roving process in spite of the state of combination of fiber and stably and completely covering with the sliver. CONSTITUTION: This double layered yarn is produced by feeding a sliver forming a core part to the outside of draft area when viewed from frier head in a roving process, completing prescribed draft between a back roll and a second roll, feeding the winding sliver to the inside, completing prescribed draft by front roll provided before the second roll and having faster surface rate than second roll, obtaining roving as a double layered structure between flier head and subjecting the roving to fine spinning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a double layer yarn having a double layer cross-section structure.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed as a method for producing a multi-layer yarn having a multi-layer cross-sectional structure in which fibers having different properties are arranged in a core-sheath structure. A typical combination method is a method in which a sliver serving as a sheath is wound around a sliver serving as a core between a front roll and a fryer of a roving machine to form a roving and then spinning (Japanese Patent Publication No. 56-11775). Is mentioned. In this method, a difference in draft resistance is used to generate a tension difference in the sliver, and the sliver is twisted by a fryer to form a multi-layer cross-sectional structure. Yes, there were restrictions on the combination of fibers and there was a limit to product development. Further, variations in the tension balance of the sliver when it was wound also caused yarn unevenness and variations in the covering state.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above situation, and the fibers to be combined can be arbitrarily selected without being restricted by the difference in draft resistance.
Moreover, it is an object of the present invention to provide a method for producing a multi-layered yarn capable of stably forming a multi-layered cross-sectional structure arranged in a core-sheath structure.

[0004]

The present invention achieves the above object and has the following configuration. That is, according to the present invention, two slivers are supplied from a back roll of a roving machine to a draft region of the roving machine at intervals with each other, and after drafting to a predetermined thickness, the sliver is passed through a fryer head and wound as roving. At the time of picking, one sliver is used as a core, and the other sliver is wound around the sliver forming the core so that the sliver forming the core is supplied to the outside of the draft area as viewed from the fryer head, and the winding sliver is inside. The sliver forming the core completes a predetermined draft between the back roll and the second roll, and the wound sliver is a front roll having a higher surface speed than the second roll provided in front of the second roll. And the sliver forming the core is attached to the extension line of the sliver in the draft axis direction and the sliver. The angle between the final nip point of the second roll of the bar and the line connecting the fryer head is supplied to the fryer head so that the angle θ projected on the horizontal plane is in the range of 0 to 60 °, and the fryer of the roving frame is rotated. Characterized by intensively propagating the resulting twist to the core sliver and winding it around the core sliver while spinning the sliver to form a roving yarn having a double-heavy fiber layer and then spinning the roving yarn. The gist is a method for producing a multi-layer yarn.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic side view showing an example of a roving machine for producing a roving required for carrying out the method of the present invention, and FIG. 2 is a plan view thereof, showing a sliver S ₁ forming a core and a winding sliver. S ₂ is supplied from the back roll A to the draft area at a distance from each other and forms a core sliver S.
₁ is drafted from the back roll A through the apron B and the second roll C, and the second roll C completes the draft to a predetermined thickness, and the winding sliver S ₂ is larger than the second roll provided in front of the second roll C. The front roll D having a high surface speed is further drafted to complete a predetermined draft. The sliver S ₁ forming the core is supplied to the outside of the draft area as viewed from the flyer head E, the sliver S ₂ wound is supplied to the inside, and the sliver S ₁ forming the core is supplied to the draft shaft after completion of the draft. The angle formed by the extension line of the direction and the line connecting the final nip point P of the second roll C of the sliver and the fryer head E is adjusted so that the angle θ projected on the horizontal plane is in the range of 0 to 60 °. Is supplied to. Coated but the sliver S ₂ wound because they are spun in tension is low sliver S ₂ wound be set to an angle θ obtained by projecting the horizontal plane becomes negative keep up around the sliver S ₁ forming the core portion stably I can't get the status. On the other hand, if the angle θ projected on the horizontal plane exceeds 60 °, the winding angle of the winding sliver S ₂ becomes large and the parallelism deteriorates, which makes it difficult to make the draft uniform during spinning and causes yarn unevenness. When the core sliver S ₁ is fed from the final nip point P of the second roll C of the core sliver S ₁ toward the fryer head E, and when there is an obstacle such as a front roll, the draft is appropriately performed. A line can be provided with a guide for spinning, and in this case, the final nip point P is moved to the position of the guide, and the angle formed by the line connecting the final nip point P and the fryer head E is projected on a horizontal plane. Let us consider θ.

Since the winding sliver S ₂ is supplied at a higher speed than the sliver S ₁ forming the core, the twist due to the rotation of the flyer is intensively transmitted to the sliver S ₁ forming the core and has a small tension. It serves to wind the winding sliver S ₂ around the core sliver S ₁ . The ratio of the surface velocities of the second roll C and the front roll D may be appropriately determined depending on the fiber material supplied or in consideration of the weight ratio of the sliver S ₁ forming the core and the winding sliver S _2. : 1.01
It is preferably set to 1: 1.25. Sliver S ₁ that forms the core after drafting and sliver S _{2 that} is wound around
The weight ratio of the winding sliver S ₂ is 30% or more in order to cover the sliver S ₁ forming the core with the winding sliver S ₂ in a stable manner, although it depends on the characteristics required by the application. Is preferred.

The sliver S ₁₂ supplied to the flyer head E passes through the flyer F and is wound up on the bobbin G as roving H. The roving spun in this way exhibits a cross-sectional structure having a multi-ply fiber layer, and the desired multi-ply yarn can be obtained by spinning this roving with a conventional spinning machine.

[0008]

In the present invention, after the sliver forming the core and the winding sliver have both completed the predetermined draft in the draft area, the winding sliver is supplied to the fryer head at a set speed and at a higher speed. ，
The twist due to the rotation of the fryer is intensively propagated to the sliver that forms the core, and the winding with a small tension is not propagated to the sliver. In this state, the sliver forming the core can be completely covered with the wound sliver, and a uniform multi-layer yarn can be obtained.

[0009]

【Example】

 Example 1 Using a roving machine having the structure shown in FIGS. 1 and 2, a core portion is formed.
Sliver S₁Polyester 1 denier x 38 mm
Seeing the sliver composed of from the flyer head E
Supply to the outside and wrap sliver S₂As 100 cotton
% Of Commas Liver seen from Flyer Head E
Sliver S that forms the core by supplying to the side ₁(Polyeste
Rusliver completed the draft on the second roll,
Winding sliver S₂(Cotton sliver) is the second
Front surface velocity ratio with the C
Draft completed with Dolle, polyester sliver
And cotton sliver weight ratio 40:60, draft
Axial extension and second polyester sliver
Connect the final nip point P of the roll C and the fryer head E
The angle between the line and the line is 15 °
The weight of the roving is 0.
Spun roving with 592g / m and twist number 1.129T / inch
Was. The resulting roving yarn is spun at a draft ratio of 40 times to 40
A double-layered yarn according to the present invention of hand (English cotton count) was obtained.

The obtained multi-layer yarn was dyed directly with a dye, and its cross section was observed with a microscope. As a result, cotton dyed with the dye occupies the outer layer part, and polyester dyed with no dye is the core. It was confirmed that it existed in the department.

Example 2 Using a roving machine having the structure shown in FIGS. 1 and 2, as the sliver S ₁ forming the core, a 100% cotton comb sliver was fed to the outside as seen from the fryer head, and the winding sliver S _{2 was used.} As a sliver colored 100% cotton in red is supplied to the inside as seen from the fryer head, the sliver S ₁ (cotton comb sliver) that forms the core completes the draft with the second roll, and the wound sliver S
₂ (cotton colored sliver) was drafted by front roll D having a surface velocity ratio of 1: 1.10 with second roll C, and the weight ratio of cotton comb sliver and cotton colored sliver was set to 30:70, and draft The angle between the extension line in the axial direction and the line connecting the final nip point P of the second roll C of the polyester sliver and the fryer head F is supplied to the fryer head F with an angle θ projected on the horizontal plane of 15 °. , Weight of roving 0.652g /
A roving of m and twist number of 1.218 T / inch was spun. The obtained roving yarn was finely spun at a draft ratio of 44 times to obtain a multi-layered yarn according to the present invention of 40 count (English cotton count).

When the cross section of the obtained multi-layered yarn was observed with a microscope, it was found that the dyed cotton occupied the outer layer portion and the undyed cotton was present in the core portion. According to the present invention, it has been confirmed that it is possible to obtain a multi-layered yarn in which the fibers are not different in draft resistance and the coated state is stable.

[0013]

According to the present invention, no matter which fiber combination is used, the sliver forming the core can be wound in the roving process to be stably and completely covered with the sliver. It is possible to obtain various multi-layer yarns.

[Brief description of drawings]

FIG. 1 is a schematic side view of an example of a roving machine that creates roving necessary to carry out the method of the present invention.

FIG. 2 is a schematic plan view of an example of a roving machine for producing a roving required for carrying out the method of the present invention.

[Explanation of symbols]

A back roll B apron C second roll D front roll E flyer head F flyer G bobbin H roving P final roll nip point S ₁ core sliver S ₂ winding sliver θ extension line in draft direction and core The angle between the final nip of the second roll of the sliver and the line connecting the flyer head is projected on the horizontal plane.

Claims (1)

[Claims] 1. Two slivers are fed from a back roll of a roving machine to a draft area of the roving machine at intervals with each other, drafted to a predetermined thickness, and then passed through a fryer head to be wound as a roving. At this time, one sliver is used as a core, and the other sliver is wound around the sliver forming the core so that the sliver forming the core is supplied to the outside of the draft area as seen from the fryer head, and the sliver is wound inside. While supplying, the sliver forming the core completes a predetermined draft between the back roll and the second roll, and the winding sliver makes a predetermined draft with the front roll having a higher surface speed than the second roll provided in front of the second roll. Complete the sliver that forms the core and attach it to the extension line of the sliver in the draft axis direction. The angle between the final nip point of the second roll and the line connecting the fryer head is supplied to the fryer head so that the angle θ projected on the horizontal plane is in the range of 0 to 60 °, and the twist generated by the rotation of the fryer of the roving machine is supplied. Is concentratedly propagated to the core sliver and is wound around the core sliver to be spun while winding the sliver to form a roving having a double heavy fiber layer, and then the roving is finely spun. Method for producing multi-layered yarn.