A SPINNING METHOD

The invention relates to a spinning method for producing yarns having various structures with the ring spinning frame, belonging to the technical field of textile processing, as known e.g. from US-A-5,115,630, JP 350031221B, JP 357011233A, JP 2003073944A.

With the scientific-technical development of the textile material and increasing requirements for fabric, style and design of garments, the demand for spinning technology is higher and higher, such as super high count yarn, multi-component composite yarn. Various spinning methods have been developed, such as sirofil spinning, siro spinning, compact spinning and cable spinning. These spinning methods considerably enrich the spinning processing means, and greatly improve the yarn quality. For example, sirofil spinning may produce a core-spun yarn with a filament and a staple fiber roving; siro spinning may perform the doubling and twisting of two rovings, which may improve the quality of the yarn and the limit fineness of the yarn made with the spinning frame; cable spinning is a method to divide a roving into many strands using a groovy roller, and to perform the doubling and twisting of the strands, so as to reduce the hairiness of the yarn and improve the quality of the yarn; compact spinning is a method for improving the quality of the hairiness, which controls the movement of the fiber of the twisted strands to reduce the formation of the fiber by using the negative pressure wind suction method or magnetic force pressurizing method and so on, so as to improve the density and quality of the yarn. However, the above-mentioned spinning methods still can not meet all people's requirements for textile materials, various types of yarns and so on. For example, though sirofil spinning can produce a core-spun yarn with a filament and a staple fiber roving, the wrapping effect is not very good, i.e. the core yarn in center is prone to be exposed. Though siro spinning may perform the doubling and twisting of two rovings, there will be a lot of broken ends when producing high count yarn, because the fiber of each roving in the twisting triangle area is very small.

SUMMARY OF THE INVENTION

In view of the spinning requirements for current new textile materials, yarns of special structures and so on, the present invention provides an embedded type system positioning spinning method, which can produce multi-component/multi-structure yarns with one ring spinning frame.

The method of the invention is defined by claim 1.

Using the above method, by changing the relative position of the two fed rovings and two fed filaments, the multi-component yarns having such as core structure, wrapped structure or ply-like structure can be produced with one ring spinning frame. The structure of yarn can be precisely determined and more compact. It is better in the hairiness, strength and evenness of the yarn. In the present invention, the two filaments can support two rovings in the twisting triangle area, so as to prevent the breaking ends. Special fiber yarns such as hemp fiber and apocynum fiber, may be produced on a conventional spinning device by using the spinning method according to the present invention, so that the range of textile material is enlarged. In addition, the improvement to the conventional device is simple and the improved device is conveniently used.

BRIEF DESCRIPTION OF THE DRAWINGS

• Fig. 1 is a schematic view of technological process according to the present invention;
• Fig. 2 is a schematic view of a drafting twist area in Fig. 1, illustrating the working principle;
• Fig. 3 is a schematic view in the case that the filaments are fed at the outer side of the rovings;
• Fig. 4 is a schematic view in the case that the filaments are fed at the inner side of the rovings;
• Fig. 5 is a schematic view in the case that the filaments are coincidently fed with the rovings, respectively; and
• Fig. 6 is a schematic view in the case that the filaments are alternately fed with the rovings.

DETAILED DESCRIPTION

Referring to Figs. 1 and 2, on each drafting mechanism of a ring spinning frame, two staple-fiber rovings a and a' unwound from roving bobbins are brought into a drafting area though a guide trumpet 1 in parallel so as to be drafted. There are a rear roller 2, a rear leather roller 2', a middle roller 3, a middle leather roller 3', an apron 4, a front roller 5 and a front leather roller 5' in the drafting area. Two filaments b and b' are fed from the back of the front roller 5, and respectively meet with the two rovings a and a' at a front jaw between the front roller 5 and the front leather roller 5'. The two drafted rovings a and a' and two filaments b and b' come out from the front jaw and enter into a twisting triangle area so as to be twisted, and then are wound onto a yarn bobbin 7 via a guide wire 6.

For illustrating the operating principle of the present invention, schematic views when the two filaments b and b' and staple-fiber rovings a and a' are fed from different relative positions are shown in Figs. 3 to 6. When the filaments b and b' are in different positions relative to staple-fiber rovings a and a', with the control of feeding tensions of the filaments b and b', the selection of fineness of the filaments b and b' and the selection of twist coefficient, different yarn 10 structures can be obtained. In the feeding form shown in Fig. 3, a wrapped yarn can be produced with the staple fiber being within the filaments. In the feeding form shown in Fig. 4, a core spun yarn can be produced with the filament being within the staple fiber. In the feeding form shown in Fig. 5 (not part of the present invention) and in Fig. 6, a yarn having the structure similar to a ply yarn can be produced. Of course, if the processing parameters are set improperly, the produced yarn may have a farraginous and 15 disordered structure of filament and staple fiber. However, the overall quality level of yarn, such as hairiness and strength, still can be improved.

The technical solution of the present invention may be applied in spinning process, such as wool spinning, cotton spinning, linen spinning and silk spinning, that is, the staple-fiber roving may be the roving made of cotton, wool, linen, silk or short chemical fiber. The two staple-fiber 20 rovings may be of the same material or different materials. The fed filament may be a chemical fiber filament, silk or yarn made of short fiber.

The technical solution of the present invention may be also applied to produce high count yarn and super-high count yarn, and to produce fiber yearns that are difficult to be produced in conventional spinning methods, such as ultra fine wool fiber, kapok fiber, algal fiber, apocynum 25 fiber, basalt fiber, hemp fiber and rabbit fur fiber, which have a short length, low strength and poor cohesion. Therefore, the present invention may be applied to various materials.

The technical solution of the present invention may also achieve the effect of siro spinning and sirofil spinning by changing the number of the fed staple-fiber rovings and filaments, and thus may serve as an alternative method of siro spinning and sirofil spinning. When the two 30 fed rovings are combined together, or one roving is directly fed, the yarn produced according to the present invention has the same yarn structure as produced by sirofil spinning. When only two rovings are fed without filament, the yarn produced according to the present invention has the same yarn structure as produced by siro spinning. There can be many other variations in the present invention, for example, two rovings and one filament located between the two rovings are fed; or two filaments and one roving located between the two filaments are fed. Therefore, many kinds of compound yarn can be produced according to the technical solution of the present invention, and thus the present invention may be widely used.

Hereinafter, the features and applications of the present invention are further illustrated by specific examples.

EXAMPLE 1 Spinning a Silk Style Yarn with the Cotton Ring Spinning Frame

Two cotton rovings a and a' are unwound from the roving bobbin, and enter into the drafting area though the guide trumpet 1 in parallel so as to be drafted; two silks b and b' are fed from the back of the front roller 5 under guiding of a location guide wire or a guide wheel. The silks b and b' are parallel to and at the outer side of the cotton rovings a and a'. The drafted two cotton rovings a and a' and two silks b and b' are output from the front jaw and enter into the twisting triangle area so as to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6. This produced yarn has a silk surface and a cotton roving core, so that the fabric made of such yarn has a silk style and a low cost.

EXAMPLE 2 Spinning a Wool Core Spun Yarn

Two wool rovings a and a' are unwound from the roving bobbin, and enter into the drafting area to though the guide trumpet 1 in parallel so as to be drafted; two polyester filaments b and b' are fed from the back of the front roller 5 under guiding of a location guide wire or a guide wheel. The filaments b and b' are parallel to and at the inner side of the wool rovings a and a'. The drafted two wool rovings a and a' and two polyester filaments b and b' are output from the front jaw and enter into the twisting triangle area so as to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6. This produced yarn has a wool surface and a polyester filament core, so that the yarn has a wool style, an improved strength and a low cost.

EXAMPLE 3 Spinning a Ramie High Count Yarn

Two ramie rovings a and a' are unwound from the roving bobbin, and enter into the drafting area though the guide trumpet 1 in parallel so as to be drafted; two polyester filaments of 50-120 denier b and b' are fed from the back of the front roller 5 under guiding of the guide wire or the guide wheel. The polyester filaments b and b' are parallel to the ramie rovings a and a' respectively, wherein the polyester filament b is overlapped with the roving a and the polyester filament b' is overlapped with the roving a'. The drafted two ramie rovings a and a' and two polyester filaments b and b' are output from the front jaw and then enter into the twisting triangle area so as to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6.

It is difficult to produce high count yarn with the ramie, because the ramie has a large diameter, a large rigidity and a poor cohesion. Though high count yarn of more than 80 counts may be produced by adopting sirofil spinning, the produced yarn is of the conventional core structure, so that the ramie fiber is prone to peel off, which may affect subsequent processing and utilization effect. The yarn produced by adopting the above technical solution of the present invention is similar to the yarn which is formed by doubling and twisting two yarns produced by sirofil spinning, and the polyester filament and short ramie fiber are entangled and combined together more closely, which may effectively prevent the ramie fiber from falling off, and obviously improve the problem of the yarn hairiness.

EXAMPLE 4 Spinning Wool Super High Count Yarn

Two rovings a and a' made of ultra fine wool are unwound from the roving bobbin, and enter into the drafting area though the guide trumpet 1 in parallel so as to be drafted; two water soluble vinylon filaments b and b' of 20-50 denier are fed from the back of the front roller 5 under guiding of the guide wire or the guide wheel. The vinylon filaments b and b' are parallel to are at the outer side of the rovings a and a'. The drafted two rovings a and a' and two vinylon filaments b and b' are output from the front jaw and then enter into the twisting triangle area so as to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6. The water soluble vinylon wrapping wool yarn is produced, and the water soluble vinylon is then dissolved in hot water so as to produce high count pure wool yarn. In order to further improve the fineness of the yarn, two fed rovings a and a' may be united, that is, to feed only one roving.

Generally, the super high count yarn refers to the cotton yarn of more than 120 Ne (English yarn count) or the wool yarn of 220 Nm (metrical yarn count). Because the number of the fibers in the cross section of yarn is very small (approximately the limit number) due to high yarn count, it is difficult to produce the super high count yarn by directly spinning. Currently, the super high count yarn is produced by spinning with the carrier water-soluble fiber and then dissolving the carrier water-soluble fiber. At present, the super high count yarn is mainly produced by adopting carrier filament sirofil spinning. Because the number of the fibers in the cross section of produced yarn is very small, and the core is not well wrapped in the sirofil spinning, there are a lot of broken ends during the spinning, and a lot of hairiness appears on the fabric after the water soluble filament is dissolved, which will affect the quality of the yarn. However, for the super high count yarn made by the spinning method according to the present invention, the carrier filament fiber is located on the surface of the yarn, and the structure of the yarn will not changed after dissolving the filament, so the fabric has a good quality. Besides, during spinning, the fiber output from the front jaw may be supported by the filament fiber, which can also prevent the yarn from breaking and thus improve the spinning efficiency.

EXAMPLE 5 Spinning Special Fiber Yarn

At present, with the development of the fiber processing technology, a lot of natural fibers with excellent performances are developed, such as hemp fiber and apocynum fiber. It is difficult to produce these fibers with the spinning frame due to the short length and low strength of the fibers. By adopting the sinning method according to the present invention, these fibers can be spun. Taking hemp fiber as an example, the method is illustrated in detailed as below.

Two rovings a and a' made of hemp fibers are unwound from the roving bobbin, and enter into the drafting area though a guide trumpet 1 in parallel so as to be drafted; two polyester or other chemical filaments b and b' of 20-120 denier are fed from the back of the front roller 5 under guiding of the guide wire or the guide wheel. The filaments b and b' are parallel to the hemp rovings a and a', wherein the filaments b and b' are alternately arranged with the rovings a and a'. The drafted two rovings a and a' and two filaments b and b' are output from the front jaw and enter into the twisting triangle area so as to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6. The chemical fiber of the filament may improve the strength of the hemp fiber, so as to ensure that the hemp fiber may be twisted after being output from the front jaw during spinning, and prevent the short hemp fiber from breaking in the twisting triangle area. The produced yarn may meet the mechanics requirement in the yarn spinning because of the filament existing in the produced yarn. In addition, the filament wraps the short hemp fiber, so the yarn has the feature of the hemp fiber.

EXAMPLE 6 Spinning Untwisted Yarn

The untwisted yarn is the yarn which has straight fibers being parallel with each other and untwisted in the center and fibers wound on the surface. The untwisted yarn is puffy, and is good material to make towel and underwear. At present, the untwisted yarn is processed by using sirofil spinning, but it is difficult to ensure the quality of the yarn. The untwisted yarn may be easily processed by using the spinning method according to the present invention.

Two rovings a and a' made of excellent long-staple cotton are unwound from the roving bobbin, and enter into the drafting area though a guide trumpet 1 in parallel so as to be drafted; two S twist short-staple yarns b and b' of more than 80 Ne are fed from the back of the front roller 5 under guiding of the location guide wire or the guide wheel. The S twist short-staple yarns b and b' are parallel to the cotton rovings a and a', wherein the S twist short-staple yarns b and b' are at the inner side of the cotton rovings a and a'. The drafted two rovings a and a' and two S twist yarns b and b' are output from the front jaw and enter into the twisting triangle area so as to perform a Z twist, and then are wound onto the yarn bobbin 7 via the guide wire 6, so that a Z twist untwisted yarn is produced with the inner fibers being straight and parallel with each other and the outer fibers being closely wound. In order to increase the final count of the yarn, one of the two fed S twist short-staple yarn may be omitted, that is, only one S twist short-staple yarn may be fed, and this S twist short-staple is between two rovings a and a'. In this way, the Z twist untwisted yarn may also be produced with the inner fibers being straight and parallel with each other and the outer fibers being closely wound.

EXAMPLE 7 Spinning Polyester Viscose Blended Elastic Yarn

Two rovings a and a' are unwound from the roving bobbin, and enter into the drafting area though the guide trumpet 1 in parallel so as to be drafted, wherein the roving a is made of viscose staple fiber, and the roving a' is made of polyester staple fiber; two polyurethane filaments b and b' are fed from the back of the front roller 5 under guiding of the location guide wire or the guide wheel. The polyurethane filaments b and b' are parallel to and at the inner side of the rovings a and a'. The drafted two rovings a and a' and two polyurethane filaments b and b' are output from the front jaw and enter into the twisting triangle area to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6. As a result, a polyester viscose blended elastic yarn is produced.

EXAMPLE 8 Spinning Silk Type Elastic Yarn with the Cotton Ring Spinning Frame

Two cotton rovings a and a' are unwound from the roving bobbin, and enter into the drafting area though a guide trumpet 1 in parallel so as to be drafted; a silk b and a polyurethane filament b' are fed from the back of the front roller 5 under guiding of the location guide wire or the guide wheel. The silk b and polyurethane filament b' are parallel to the cotton rovings a and a' respectively, wherein the silk b is at the outer side of cotton rovings a and a', and the polyurethane filament b' is at the inner side of the cotton rovings a and a'. The drafted two cotton rovings a and a' and silk b and polyurethane filament b' are output from the front jaw and enter into the twisting triangle area so as to be twisted, and then are wound onto the yarn bobbin 7 via the guide wire 6. The produced yarn has silk on its surface, cotton in its middle and polyurethane filament in its centre. The fabric made of this yarn has silk style, and good elasticity. The use of cotton fibers decreases the cost of the yarn.