Feed roller, rotor spinning machine and linen-like yarn production method

Abstract

The application discloses a feeding roller, a rotor spinning machine and a production method of a rough yarn, and relates to the technical field of spinning, which comprises a roller shaft; a plurality of convex rib groups are fixedly arranged on the outer lateral wall of the roller shaft, each convex rib group is uniformly distributed in the circumferential direction of the axis of the roller shaft, and there is a spacing interval between two adjacent convex rib groups; the convex rib group comprises at least one first convex rib, and the first convex rib extends along the axis of the roller shaft; in the circumferential direction of the roller shaft, the circumferential length of the spacing interval is consistent with the circumferential length of one convex rib group. The rotor spinning machine comprises the feeding roller. The production method of the rough yarn takes cotton fibers as raw materials and sequentially performs production through a cotton assorting process, a scutcher process, a cotton carding process, a drawing process and an air spinning process; in the air spinning process, the rotor spinning machine is used. Finally, the produced rough yarn has a better nub effect.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a feeding roller, a rotor spinning machine, and a method for producing linen-feel yarn. Background Technology

[0002] Flax fibers possess rapid moisture absorption and release capabilities, allowing flax products to effectively regulate the thermal and moisture balance between the human body and the environment. They quickly wick away vaporous and liquid sweat from the body, maintaining a comfortable temperature and humidity level, resulting in excellent dryness when worn. Flax products exhibit unique characteristics in terms of luster, drape, and fabric texture. The irregular, mixed polygonal cross-section of flax fibers creates diffuse reflection in the yarn and fabric, resulting in a soft color tone. Visually, the fabric is rugged and bold, with thick sections 3–15 cm in length and 1.6–2.3 times the thickness of the fibers, lacking any artificiality. It drapes elegantly, has a natural texture, soft colors, and a crisp, sophisticated appearance. However, due to the complex wet spinning process, low automation, high labor intensity for workers, and poor production environment, the degumming and bleaching processes contribute to environmental pollution. Furthermore, the tight supply of flax raw materials makes long-staple flax products very expensive, severely limiting the large-scale production of wet flax and failing to fully meet the needs of general consumers.

[0003] Common cotton raw materials can be used, and the rotor spinning process, which has a short process and high output, can be employed to attempt to produce a fabric with a rough texture and feel similar to wet-spun linen. Due to the yarn formation mechanism of rotor-spun yarn, fabrics made from it have a relatively stiff feel, approaching the crisp and dry feel of wet-spun linen. However, due to the fact that the roughness of rotor-spun fabrics is generally over 30cm, the fabric appears rougher and lower-grade, lacking the delicate and natural feel of wet-spun linen, and exhibiting a weaker linen-like texture.

[0004] Therefore, it is particularly important to improve existing equipment to optimize the thick knot effect of pure cotton yarn fabrics using rotor spinning technology, so that its appearance is closer to that of wet-spun linen fabrics. Summary of the Invention

[0005] The purpose of this invention is to provide a feeding roller, a rotor spinning machine, and a method for producing linen-feel yarn, so as to solve the problems existing in the prior art and make the produced linen-feel yarn have better thickening effect.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] The present invention provides a feeding roller, including a roller shaft; a plurality of convex rib groups are fixedly disposed on the outer side wall of the roller shaft, each of the convex rib groups being evenly distributed circumferentially around the axis of the roller shaft, and there is a gap between adjacent convex rib groups; each convex rib group includes at least one first convex rib, the first convex rib extending along the axis of the roller shaft; in the circumferential direction of the roller shaft, the circumferential length of the gap is consistent with the circumferential length of one of the convex rib groups.

[0008] The present invention also provides a rotor spinning machine, including the feed rollers as described above.

[0009] The present invention also provides a method for producing linen-feel yarn, which uses cotton fiber as raw material and proceeds sequentially through a cotton blending process, a cotton cleaning process, a cotton carding process, a drawing process, and an air-jet spinning process; in the air-jet spinning process, a rotor spinning machine as described above is used.

[0010] Preferably, in the cotton blending process, short fibers with a length of 20 mm and long fibers with a length of 32 mm are used in combination, and the ratio of the short fibers to the long fibers is 70:30.

[0011] Preferably, in the cotton cleaning process, the cotton cleaning process involves sequentially passing through a cotton grabber, a cotton opener, a cotton blender, a fine cotton opener, a foreign fiber machine, and a dust collector.

[0012] Preferably, in the carding process, the short fibers with SFC(W) 12.7mm or less are controlled to be 35%.

[0013] Preferably, in the drawing process, the drafting interval of the drawing machine is set to 50mm*53mm.

[0014] Preferably, the process further includes a packaging process after the air-jet spinning process, wherein the packaging process is to package the linen-feel yarn generated in the air-jet spinning process.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] The feeding roller provided by this invention deliberately alters the friction of the cotton sliver by setting an interval on the roller shaft with a spacing equal to the length of the convex ribs, resulting in uneven feeding of the cotton sliver. This helps to accumulate fibers locally, thereby achieving a short and dense slub spinning effect, enhancing the slub effect of air-jet spinning, and making the resulting linen-feel yarn have a better coarseness effect.

[0017] The present invention also provides a rotor spinning machine, which can achieve the spinning effect of short bamboo by using feeding rollers with the same circumference of the interval and the convex rib group, thereby making the thick part effect of the produced hemp-like yarn better.

[0018] This invention also provides a method for producing linen-feel yarn. Based on air-jet slub yarn, by using a rotor spinning machine modified from the feed rollers, the slub yarn can be optimized to form a coarser effect that is more suitable for linen products.

[0019] Furthermore, due to the aggregation effect of fibers of different lengths during the spinning and drafting process, long fibers are preferentially grasped and moved during fiber drafting and slippage, while short fibers cannot be effectively grasped and slide by overcoming inter-fiber friction, thus continuously aggregating to form thick and thin sections in the sliver. Therefore, considering the problem of the relatively long section length of slub spinning inherent in air-jet spinning, when preparing the sliver, the slippage characteristics of fibers of different lengths can be utilized to rationally specify the cotton long and short fiber blending scheme, using a combination of 20mm and 32mm fibers in a ratio of 70:30. By utilizing the variable speed characteristics of short fibers during the drafting process, the relative aggregation of short fibers can be achieved, making the length and thickness of the thick sections more suitable for wet-spun flax products.

[0020] Furthermore, in the cotton cleaning process, compared to the traditional cotton cleaning process, the impurity removal machine between the cotton grabber and the cotton opener is removed, thereby reducing the imbalance of the ratio of long and short fibers in the cotton blending process and maintaining a cotton blending effect of 70:30 for long and short fibers.

[0021] Furthermore, in the carding process, controlling the short fibers below 12.7mm in SFC(W) to 35% can make the slub joints tighter and shorter. This intentionally adjusts the carding drop effect to ensure the slub joint effect, making it more in line with the coarse appearance of linen.

[0022] Furthermore, the drafting spacing is adjusted from the original 40mm*48mm to 50mm*53mm, which can intentionally produce cotton slivers with more and more irregular thicknesses in the drawing process, assisting in the control of the slub yarn length and pitch in the subsequent air-jet spinning process, and enhancing the yarn effect of the final linen-like yarn formed in the air-jet spinning process.

[0023] Furthermore, in the air-jet spinning process, the linen-like yarn produced by the rotor spinning machine can be packaged in the packaging process for convenient handling and other processing. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the surface structure of the feed roller provided by the present invention;

[0026] Figure 2 A schematic diagram of the surface structure of a traditional feed roller;

[0027] Figure 3 This is a partial structural diagram of the feed roller on a rotor spinning machine provided by the present invention.

[0028] In the picture:

[0029] 10-Feed roller; 11-Roller shaft; 12-Protruding rib group; 13-First protruding rib; 14-Interval spacing;

[0030] 20 - Feed into the flared inlet;

[0031] 30 - Upper feed inlet;

[0032] 40 - Cotton feeding tray;

[0033] 50-dividing comb rollers. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The purpose of this invention is to provide a feeding roller, a rotor spinning machine, and a method for producing linen-feel yarn, so as to solve the problems existing in the prior art and make the produced linen-feel yarn have a better thickening effect.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] This embodiment provides a feeding roller 10, such as Figures 1-3 As shown, the use of a rotor spinning machine to produce linen-like yarn from cotton fibers includes a roller shaft 11; a plurality of rib groups 12 are fixedly provided on the outer wall of the roller shaft 11, each rib group 12 is evenly distributed circumferentially around the axis of the roller shaft 11, and there is a gap 14 between two adjacent rib groups 12; the rib group 12 includes at least one first rib 13, the first rib 13 extends along the axis of the roller shaft 11; in the circumferential direction of the roller shaft 11, the circumferential length of the gap 14 is consistent with the circumferential length of one rib group 12.

[0039] By setting the roller shaft 11 with an interval spacing 14 equal to the length of the convex rib group 12, the friction force on the cotton sliver is deliberately changed, so that the cotton sliver is fed unevenly, which helps the fibers to accumulate locally, thereby achieving a short and dense slub spinning effect, enhancing the slub effect of air-jet spinning, and making the thick slub effect of the produced linen-feel yarn better.

[0040] Example 2

[0041] This embodiment provides a rotor spinning machine, including a feed roller 10 as described in Embodiment 1.

[0042] By using a feeding roller 10 with a spacing of 14 and a perimeter of the same size as the convex rib group 12, the spinning effect of short bamboo can be achieved, thereby making the thicker part effect of the resulting hemp-like yarn better.

[0043] Specifically, such as Figure 3 As shown, this is a modification made on an Autocoro 9 rotor spinning machine. The modified part is the feed roller 10. The sliver passes through the lower feed bell 20 and enters the upper feed bell 30. Then, it is clamped between the feed roller 10 and the feed support plate 40. The feed roller 10 drives the sliver to feed into the combing roller 50. The surface of the feed roller 10 adopts the relevant structure of Example 1, which deliberately creates unevenness in the sliver feeding, thereby achieving a short and dense slub spinning effect.

[0044] Example 3

[0045] This embodiment provides a method for producing linen-feel yarn, using cotton fiber as raw material. The process flow includes, in sequence: cotton blending, opening, carding, drawing, air-jet spinning, and packaging.

[0046] ① Cotton blending process:

[0047] In the optional solutions of this embodiment, it is more preferred that, in the cotton blending process, compared with the normal cotton blending requirement that the fiber length be between 26mm and 30mm, this solution uses short fibers with a length of 20mm and long fibers with a length of 32mm, and the ratio of short fibers to long fibers is 70:30.

[0048] Due to the aggregation effect of fibers of different lengths during the spinning and drafting process, longer fibers are preferentially grasped and moved during fiber drafting and slippage, while shorter fibers cannot be effectively grasped and slide by overcoming inter-fiber friction, thus continuously aggregating and forming thick and thin sections in the sliver. Therefore, considering the problem of the relatively long section length of slub spinning inherent in air-jet spinning, when preparing the sliver, the slippage characteristics of fibers of different lengths can be utilized to rationally specify the cotton long and short fiber blending scheme, using a combination of 20mm and 32mm fibers in a ratio of 70:30. By utilizing the variable speed characteristics of short fibers during the drafting process, the relative aggregation of short fibers can be achieved, making the length and thickness of the thick sections more suitable for wet-spun linen products.

[0049] ② Cleaning process:

[0050] In the optional solutions of this embodiment, a preferred embodiment is that the cotton cleaning process sequentially passes through a cotton grabber, a cotton opener, a cotton blender, a fine cotton opener, a foreign fiber machine, and a dust collector. (The traditional cotton cleaning process is: cotton grabber - impurity remover - cotton opener - cotton blender - fine cotton opener - foreign fiber machine - dust collector; if the traditional cotton cleaning process is used, the fiber length ratio in the blended cotton may be unbalanced due to the impact of cotton waste, and the 70:30 blending effect cannot be achieved. Therefore, the cotton cleaning process is changed to: cotton grabber - cotton opener - cotton blender - fine cotton opener - foreign fiber machine - dust collector)

[0051] In the cotton cleaning process, compared with the traditional cotton cleaning process, the impurity removal machine between the cotton grabber and the cotton opener is removed, thereby reducing the imbalance of the ratio of long and short fibers in the cotton blending process and maintaining a cotton blending effect of 70:30 for long and short fibers.

[0052] ③ Carding process:

[0053] In the optional embodiments of this example, it is more preferred that, in the carding process, the short fibers with an SFC (W) of 12.7mm or less are controlled at 35%. (Normally, to ensure the quality of air-jet spinning and the evenness of the yarn, the short fibers with an SFC (W) of 12.7mm or less are controlled at 30% in carding.)

[0054] In the carding process, controlling the short fibers below 12.7mm in SFC(W) to 35% can make the slub joints tighter and shorter. The carding drop effect is intentionally adjusted to ensure the slub joint effect, making it more in line with the coarse appearance of linen.

[0055] ④ Drawing process:

[0056] In the optional schemes of this embodiment, it is more preferred that the drafting distance of the drawing frame is set to 50mm*53mm in the drawing process (that is, the front drafting distance is 50mm and the rear drafting distance is 53mm; here the secondary drafting distance is the same as the roller distance).

[0057] Adjusting the drafting spacing from the original 40mm*48mm to 50mm*53mm allows for the deliberate production of slivers with varying thicknesses and irregularities during the drawing process. This aids in controlling the length and pitch of the slub yarn in the subsequent air-jet spinning process, ultimately enhancing the hemp-like yarn finish produced by the air-jet spinning process.

[0058] ⑤ Air-jet spinning process:

[0059] In the optional schemes of this embodiment, it is more preferred to use a rotor spinning machine as in Embodiment 2 in the air-jet spinning process.

[0060] Specifically, air-jet spun linen-like yarn relies on air-jet slub spinning, but due to its large segment length and pitch, it is difficult to achieve the linen-like effect on the fabric.

[0061] Therefore, the key adjustments should be made to the cotton blending and the feed roller 10 of the rotor spinning machine:

[0062] In particular, by employing the surface configuration of the feed roller 10 as shown in Example 1 to enhance the slub spinning effect, the actual slub length measured is 10cm to 18cm, compared to the conventional slub length of over 30cm in air-jet spinning.

[0063] Specifically as follows:

[0064]

[0065] ⑥ Packaging process:

[0066] In the optional solutions of this embodiment, a more preferred option is to include a packaging process after the air-jet spinning process, wherein the packaging process is to package the linen-feel yarn generated in the air-jet spinning process.

[0067] In the air-jet spinning process, the linen-like yarn produced by the rotor spinning machine can be packaged in the packaging process for easy handling and other processing.

[0068] Specifically, after the relevant adjustments and settings in the above processes, it is possible to achieve a length of 5cm to 18cm and a thickness of 1.6 to 2.1 times the thickness of the yarn. The resulting yarn fabric has an appearance style that is very close to that of wet-spun linen fabric. Therefore, the yarn product formed from it is air-jet spun linen-feel slub yarn, also known as linen-feel yarn.

[0069] Regarding other relevant explanations:

[0070] The method for producing linen-like yarn in this embodiment is based on the traditional air-jet spun slub yarn production method with corresponding adjustments (except for the adjustments mentioned above, other setting parameters are the same as those for traditional air-jet spun slub yarn) to achieve the desired linen-like yarn production effect. The means and underlying principle are based on controlling and improving the speed variation law during fiber drafting: during drafting, fibers of different lengths exhibit different speed variation laws. This phenomenon is mainly affected by factors such as fiber length, draft ratio, roller spacing, and friction distribution. The following is an analysis of the speed variation law of drafting for fibers of different lengths:

[0071] 1. The speed variation law of long fibers

[0072] When long fibers are subjected to varying speeds within the drafting zone, they typically exhibit the following characteristics:

[0073] ① Concentrated speed changes and proximity to the front nip: Because the tail end of long fibers is more easily affected by the frictional force of the rear nip during drafting, while the head end enters the front nip control area more quickly, the speed change point of long fibers is often closer to the front nip. This speed change characteristic allows long fibers to be straightened and dispersed better during drafting, thereby improving the uniformity of the yarn.

[0074] ② Significant guiding force effect: Within the drafting zone, long fibers are more easily guided by the surrounding fast fibers, thus accelerating their forward movement. This acceleration effect makes long fibers more stable during speed changes, reducing yarn quality problems caused by uneven speed changes.

[0075] 2. The speed variation law of short fibers

[0076] Compared to long fibers, short fibers exhibit different rate-varying behavior during the drawing process:

[0077] ① Dispersed and distant speed changes from the front nip: Due to their shorter length, short fibers are less affected by the frictional force of the rear nip during drafting, while the head end is more easily controlled by the gripping force of the front nip. Therefore, the speed change points of short fibers are often farther away from the front nip, and the speed change process is relatively dispersed. This speed change characteristic makes short fibers more prone to entanglement and irregular movement during drafting, thus affecting the uniformity and quality of the yarn.

[0078] ② Significant control force effect: Within the stretching zone, short fibers are more easily controlled by the surrounding slower-moving fibers, thus maintaining a slower motion speed. This control force makes it more difficult for short fibers to change speed, requiring a larger stretching force to generate relative motion.

[0079] 3. Analysis of influencing factors

[0080] ① Fiber length: Fiber length is the most direct factor affecting the speed variation law. Due to its length advantage, long fibers are more easily guided by the guiding force and accelerate forward during the drafting process; while short fibers are more easily controlled by the controlling force and maintain a slower speed.

[0081] ② Draft ratio: The higher the draft ratio, the more intense the relative movement between fibers and the more obvious the speed change process. However, it is also important to control the draft ratio within a reasonable range to avoid problems such as fiber breakage or excessive knots.

[0082] ③ Roller spacing: The size of the roller spacing also affects the fiber's speed change pattern. When the spacing is too large, the interaction between fibers weakens, and the speed change process becomes smooth; while when the spacing is too small, it may lead to problems such as fiber entanglement and breakage.

[0083] ④ Friction boundary distribution: The proper distribution of the friction boundary is crucial for the fiber's speed change process. By adjusting the intensity and distribution position of the friction boundary, the speed change point and speed of the fiber can be controlled, thereby obtaining yarn products with more stable quality.

[0084] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for producing linen-feel yarn, characterized in that: It is produced using cotton fiber as raw material, through a series of processes including blending, cleaning, carding, drawing, and air-jet spinning. In the air-jet spinning process, the rotor spinning machine used includes the following feed rollers; The feed roller includes a roller shaft; Multiple sets of protruding ribs are fixedly provided on the outer wall of the roller shaft. Each set of protruding ribs is evenly distributed around the axis of the roller shaft, and there is a gap between two adjacent sets of protruding ribs. The convex rib group includes at least one first convex rib, which extends along the axis of the roller shaft; In the circumferential direction of the roller shaft, the circumferential length of the interval is consistent with the circumferential length of one of the convex rib groups; In the cotton blending process, short fibers with a length of 20mm and long fibers with a length of 32mm are used in combination, and the ratio of the short fibers to the long fibers is 70:

30. In the carding process, the proportion of short fibers with an SFC (W) thickness of 12.7 mm or less is controlled at 35%. In the drawing process, the drafting interval of the drawing frame is set to 50mm. 53mm.

2. The method for producing linen-feel yarn according to claim 1, characterized in that: In the cleaning process, the cleaning flow consists of sequentially passing through a cotton grabber, a cotton opener, a cotton blender, a fine cotton opener, a foreign fiber machine, and a dust collector.

3. The method for producing linen-feel yarn according to claim 1, characterized in that: The air-jet spinning process is followed by a packaging process, which involves packaging the linen-feel yarn generated in the air-jet spinning process.

Images