Method and apparatus for pneumatic guiding and capturing strand fibers on ring frame

Abstract

A method for ring-spinning with pneumatic guiding and capturing includes steps of: respectively fixing a pneumatic guiding and capturing apparatus in front of each drawing system of a ring frame; twisting the ribbon-like strand outputted through a front roller nip to form a spinning strand, moving the spinning strand into a holder groove of a capturing holder; guiding ribbon-like strand edge fibers to closely contact with a spinning strand main body by negative pressure airflow in the holder groove; before the ribbon-like strand edge fibers enter an in-take opening, cohering the edge fibers with the spinning strand for being partly captured by the spinning strand stem; other un-captured edge fibers become spinning strand hairiness, which is then stretched and tightly wrapped onto the spinning strand stem by a negative pressure; the spinning strand is outputted from the holder groove outlet to get a high qualified spun yarn.

Claims

1. A method for pneumatic guiding and capturing strand fibers, comprising steps of: respectively fixing a pneumatic guiding and capturing apparatus in front of each front roller nip of each drawing system of a ring frame, wherein the pneumatic guiding and capturing apparatus is mounted on sucking pipes (8) of the ring frame, the pneumatic guiding and capturing apparatus comprises a capturing holder (3), an air passage communicator (4), and a movable cover (1); wherein a holder groove (6) is provided on the capturing holder (3), a horn end thereof is an inlet, and an extending end thereof is an outlet; a wind in-taker is provided inside the capturing holder (3), in-take openings (7) of the wind in-taker are narrow-shaped and are symmetrically arranged on an internal wall of the holder groove (6); and an axis of a wind in-taker portion near the in-take openings (7) is corresponding to an inlet axis of the holder groove (6); wherein the air passage communicator (4) comprises a base (5) and a cover installing platform (2); the base (5) and the cover installing platform (2) are integrated, the cover installing platform (2) is aside the base (5); a tunnel is provided inside the base (5), a top end of the base (5) is a concave base; the capturing holder (3) is inserted into the top end of the base (5); the wind in-taker inside the capturing holder (3) communicates with the tunnel inside the base (5); the movable cover (1) is mounted on the platform of the cover installing platform (2) by a hinge; a hinge shaft of the hinge is parallel to the axis of the holder (6); and the base (5) communicates with the sucking pipe (8); wherein after being drafted by the drawing system on the ring spinning machine, the fiber strand is pressed with a shape of flat ribbon to form a ribbon-like fiber strand; the ribbon-like fiber strand is then outputted from the front roller nip to form a spinning strand; the outputted spinning strand is then moved into the capturing holder (3) through the inlet of the holder groove (6), wherein negative pressure wind of the sucking pipe (8) generates a negative pressure flow inside the holder groove (6) through the tunnel of the base (5), the wind in-taker of the capturing holder (3) and the in-take openings (7), for guiding edge fibers of the ribbon-like strand to closely contact with a main body of the spinning strand inputted into the capturing holder (3); in the capturing holder (3), before the edge fibers of the ribbon-like strand, which are separated from the front roller nip, enter the in-take opening (7), cohering the strand edge fibers with hairs on the rotating surface of the spinning strand for being partly captured by the stem of the spinning strand; leaving the rest part of the edge fibers protruding out of the spinning strand surface to form hairiness; wherein when the spinning strand moves to a section of the holder groove (6) corresponding to a position of the in-take opening (7), the hairiness on the spinning strand surface is stretched by a negative pressure of the in-take opening (7), so as to closely contact with the wind in-taker and the internal wall of the holder groove (6); holding the hairiness by friction of the internal wall, and tightly wrapping onto the rotating stem of the spinning strand for fixing the ribbon-like strand edge fibers captured and eliminating the hairiness on the surface of the spinning strand; outputting the spinning strand from the outlet of the holder groove (6) to form a spun yarn, and finally winding the spun yarn onto a yarn bobbin by a pigtail guider, a steel ring and a traveler.

2. The method, as recited in claim 1, wherein a working surface of the capturing holder (3) is parallel to a platform of the cover installing platform (2), and an axis of the holder groove (6) on the working surface of the capturing holder (3) is parallel to the platform of the cover installing platform (2).

3. The method, as recited in claim 1, wherein a bottom end of the base (5) is a buckle mounted on the sucking pipe (8).

4. The method, as recited in claim 2, wherein a bottom end of the base (5) is a buckle mounted on the sucking pipe (8).

5. The method, as recited in claim 2, wherein a width of the in-take opening (7) is no less than 1.5 mm, and a length thereof is no less than 4 mm.

6. The method, as recited in claim 3, wherein a width of the in-take opening (7) is no less than 1.5 mm, and a length thereof is no less than 4 mm.

7. The method, as recited in claim 4, wherein a width of the in-take opening (7) is no less than 1.5 mm, and a length thereof is no less than 4 mm.

8. The method, as recited in claim 2, wherein a ratio of a width of the holder groove (6) near the in-take openings (7) and an outlet width of the holder groove (6) is 1.1-3.0.

9. The method, as recited in claim 3, wherein a ratio of a width of the holder groove (6) near the in-take openings (7) and an outlet width of the holder groove (6) is 1.1-3.0.

10. The method, as recited in claim 4, wherein a ratio of a width of the holder groove (6) near the in-take openings (7) and an outlet width of the holder groove (6) is 1.1-3.0.

11. An apparatus for pneumatic guiding and capturing strand fibers, comprising a pneumatic guiding and capturing apparatus, respectively fixed in front of each front roller nip of each drawing system of a ring frame, wherein the pneumatic guiding and capturing apparatus is mounted on sucking pipes (8) of the ring frame, the pneumatic guiding and capturing apparatus comprises a capturing holder (3), an air passage communicator (4), and a movable cover (1); wherein a holder groove (6) is provided on the capturing holder (3), a horn end thereof is an inlet, and an extending end thereof is an outlet; a wind in-taker is provided inside the capturing holder (3), in-take openings (7) of the wind in-taker are narrow-shaped and are symmetrically arranged on an internal wall of the holder groove (6); and an axis of a wind in-taker portion near the in-take openings (7) is corresponding to an inlet axis of the holder groove (6); wherein the air passage communicator (4) comprises a base (5) and a cover installing platform (2); the base (5) and the cover installing platform (2) are integrated, the cover installing platform (2) is aside the base (5); a tunnel is provided inside the base (5), a top end of the base (5) is a concave base; the capturing holder (3) is inserted into the top end of the base (5); the wind in-taker inside the capturing holder (3) communicates with the tunnel inside the base (5); the movable cover (1) is mounted on the platform of the cover installing platform (2) by a hinge; a hinge shaft of the hinge is parallel to the axis of the holder (6); and the base (5) communicates with the sucking pipe (8); wherein after being drafted by the drawing system on the ring spinning machine, the fiber strand is pressed with a shape of flat ribbon to form a ribbon-like fiber strand; the ribbon-like fiber strand is then outputted from the front roller nip to form a spinning strand; the outputted spinning strand is then moved into the capturing holder (3) through the inlet of the holder groove (6), wherein negative pressure wind of the sucking pipe (8) generates a negative pressure flow inside the holder groove (6) through the tunnel of the base (5), the wind in-taker of the capturing holder (3) and the in-take openings (7), for guiding edge fibers of the ribbon-like strand to closely contact with a main body of the spinning strand inputted into the capturing holder (3).

12. The apparatus, as recited in claim 11, wherein a working surface of the capturing holder (3) is parallel to a platform of the cover installing platform (2), and an axis of the holder groove (6) on the working surface of the capturing holder (3) is parallel to the platform of the cover installing platform (2).

13. The apparatus, as recited in claim 11, wherein a bottom end of the base (5) is a buckle mounted on the sucking pipe (8).

14. The apparatus, as recited in claim 12, wherein a bottom end of the base (5) is a buckle mounted on the sucking pipe (8).

15. The apparatus, as recited in claim 12, wherein a width of the in-take opening (7) is no less than 1.5 mm, and a length thereof is no less than 4 mm.

16. The apparatus, as recited in claim 13, wherein a width of the in-take opening (7) is no less than 1.5 mm, and a length thereof is no less than 4 mm.

17. The apparatus, as recited in claim 14, wherein a width of the in-take opening (7) is no less than 1.5 mm, and a length thereof is no less than 4 mm.

18. The apparatus, as recited in claim 12, wherein a ratio of a width of the holder groove (6) near the in-take openings (7) and an outlet width of the holder groove (6) is 1.1-3.0.

19. The apparatus, as recited in claim 13, wherein a ratio of a width of the holder groove (6) near the in-take openings (7) and an outlet width of the holder groove (6) is 1.1-3.0.

20. The apparatus, as recited in claim 14, wherein a ratio of a width of the holder groove (6) near the in-take openings (7) and an outlet width of the holder groove (6) is 1.1-3.0.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram showing the working principle of the present invention.

(2) FIG. 2 is a structural diagram of a negative guiding and capturing apparatus of the present invention.

(3) FIG. 3 is a side view of FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(4) Referring to the drawings, the present invention is further illustrated.

(5) A method for pneumatic guiding and capturing strand fibers comprises steps of: respectively fixing a pneumatic guiding and capturing apparatus in front of each front roller nip of each drawing system of a ring frame, wherein the pneumatic guiding and capturing apparatus are mounted on sucking pipes 8 of the ring frame, the pneumatic guiding and capturing apparatus comprises a capturing holder 3, an air passage communicator 4, and a movable cover 1; wherein a holder groove 6, which is horn-shaped, is provided on the capturing holder 3, a horn end of the holder groove 6 is an inlet, and an extending end thereof is an outlet; a wind in-taker is provided inside the capturing holder 3, in-take openings 7 of the wind in-taker are narrow-shaped, a width thereof is no less than 1.5 mm and a length thereof is no less than 4 mm; the in-take openings 7 are symmetrically arranged on an internal wall of the holder groove 6, and a ratio of a width of the holder groove 6 near the in-take openings 7 and an outlet width of the holder groove 6 is 1.1-3.0; and an axis of a wind in-taker portion near the in-take openings 7 is corresponding to an inlet axis of the holder groove 6; wherein the air passage communicator 4 comprises a base 5 and a cover installing platform 2; the base 5 and the cover installing platform 2 are integrated, the cover installing platform 2 is aside the base 5; a tunnel is provided inside the base 5, a top end of the base 5 is a concave base; the capturing holder 3 is inserted into the top end of the base 5; the wind in-taker inside the capturing holder 3 communicates with the tunnel inside the base 5; a working surface of the capturing holder 3 is parallel to a platform of the cover installing platform 2, and an axis of the holder groove 6 on the working surface of the capturing holder 3 is parallel to the platform of the cover installing platform 2; the movable cover 1 is mounted on the platform of the cover installing platform 2 by a hinge; a hinge shaft of the hinge is parallel to the axis of the holder 6, wherein the movable cover 1 is movably mounted on the cover installing platform 2 by the hinge, which is conducive to moving the yarn into the holder groove 6 through an internal between the movable cover 1 and the capturing holder 3, and enables that the movable cover 1 covers the working surface of the capturing holder 3 during normal spinning, so as to avoid that the negative pressure airflow enters the holder groove 6 from a top, and ensure that during normal spinning, negative pressure airflow only enters from the inlet of the holder groove 6; a bottom end of the base 5 is a pear-shaped buckle mounted on the sucking pipe 8; and the base 5 communicates with the sucking pipe 8; wherein after being drafted by the drawing system, the fiber strand is pressed as a ribbon-like fiber strand; outputting the ribbon-like fiber strand through the front roller nip of the ring frame, twisting the ribbon-like fiber strand outputted for forming a spinning strand, moving the spinning strand into the capturing holder 3 through the inlet of the holder groove 6, wherein negative pressure wind of the sucking pipe 8 generates a negative pressure flow inside the holder groove 6 through the tunnel of the base 5, the wind in-taker of the capturing holder 3 and the in-take openings 7, for guiding edge fibers of the ribbon-like strand to closely contact with a main body of the spinning strand inputted into the capturing holder 3; in the capturing holder 3, before the ribbon-like strand edge fibers, which are separated from the front roller nip, enters the in-take opening 7, cohering the ribbon-like strand edge fibers with hairiness on the rotating surface of the spinning strand for being captured by the spinning strand stem; leaving the rest part of the edge fibers protruding out of the spinning strand surface to form hairiness; wherein when the spinning strand moves to a section of the holder groove 6 corresponding to a position of the in-take opening 7, the hairiness on the spinning strand surface is stretched by a negative pressure of the in-take opening 7, so as to closely contact with the wind in-taker and the internal wall of the holder groove 6; holding the hairiness by friction of the internal wall, and tightly wrapping onto the rotating stem of the spinning strand for fixing the ribbon-like strand edge fibers captured and eliminating the hairiness on the surface of the spinning strand. If the ratio of the width of the holder groove 6 near the in-take openings 7 and an outlet width of the holder groove 6 is getting smaller, the in-take opening 7 is getting closer to the outlet, and a capturing effect caused by guiding the edge fibers to closely contact with the yarn body with the negative pressure is getting smaller, but a wrapping effect caused by holding the hairiness with the negative pressure is getting larger. Therefore, for spinning techniques whose width of ribbon-like fiber strand is large and whose yarn is thick, the ratio should be large; otherwise, the ratio should be small. The spinning strand is outputted to form a high qualified spun yarn from the outlet of the holder groove 6, and finally wound on a yarn bobbin by a pigtail guider, a steel ring and a traveler.

(6) Referring to different ring-spinning practices, preferred embodiments of the present invention are illustrated.

Preferred Embodiment 1

(7) Improve Product Quality of Ring-Spinning During Cotton-Fiber Siro Spinning.

(8) For a cotton ring frame, the pneumatic guiding and capturing apparatus is mounted on the sucking pipe 8 whose cross-section is pear-shaped through the base 5, and connects the sucking pipe 8 to the wind in-taker inside the capturing holder 3, for generating the negative pressure airflow in the holder groove 6 with the in-take openings 7. Two cotton rovings enter a drawing system of the cotton ring frame respectively through two 4-mm horn-shaped opening feeders. After being drafted by the drawing system, the cotton rovings are outputted from a front roller nip outlet comprising a front rubber roller and a front roller to form ribbon-like strands. The ribbon-like cotton strands outputted are twisted together for forming a spinning strand, and are immediately inputted into the holder groove 6 of the capturing holder 3. The ratio of the width of the holder groove 6 near the in-take openings 7 and the outlet width of the holder groove 6 is 1.5-2.0. The negative pressure airflow in the holder groove 6 guides a left ribbon-like cotton strand edge fiber and a right ribbon-like cotton strand edge fiber to closely contact with the spinning strand. Before the strand edge fibers, which are separated from the front roller nip, enter the in-take opening 7, the strand edge fibers are cohered with the hairiness on the rotating surface of the spinning strand, which captures strand edge fibers escaped from the front roller nip. When the spinning strand moves to a section of the holder groove 6 corresponding to the position of the in-take opening 7, the hairiness on the surface of the spinning strand is stretched by the negative pressure of the in-take opening 7, so as to closely contact with an internal wall of the wind in-taker and the internal wall of the holder groove 6 and be held by the wind in-taker and the internal wall of the holder groove 6 with friction. The hairiness is tightly wrapped on the rotating stem of the spinning strand for fixing the cotton fibers captured and eliminating the hairiness on the surface of the spinning strand main body. The spinning strand is outputted to form a high qualified cotton bobbin yarn from the outlet of the holder groove 6, and finally wound on a yarn bobbin by a pigtail guider, a steel ring and a traveler. According to experimental results, compared with conventional ring-spun cotton yarn, 30 Ne cotton bobbin yarn prepared by the present invention is improved in that 3 mm hairiness index is decreased by 70%, gram-weight per 100 m is increased by 3.1%, and yarn strength is increased by 4.9%. Thereof, product quality is significantly improved.

Preferred Embodiment 2

(9) Improve Product Quality of Ring-Spinning During Wool Siro Core-Spun Composite Spinning.

(10) For a worsted ring frame, a wool one-pipe-per-spindle sucking pipe system is replaced by the sucking pipe 8 whose cross-section is pear-shaped. The pneumatic guiding and capturing apparatus is mounted on the sucking pipe 8 through the base 5, and connects the sucking pipe 8 to the wind in-taker inside the capturing holder 3. Two wool rovings enter a drawing system of the wool ring frame respectively through two 6-mm horn-shaped opening feeders. After being drafted by the drawing system, the wool rovings are outputted to form ribbon-like strands from a front roller nip outlet comprising a front rubber roller and a front roller, and a polyester filament unwound from filament package passes through a guilder and is outputted from a rear of the front rubber roller by the front roller. The polyester filament is placed between the two wool rovings, and is twisted together with the two ribbon-like strands outputted for forming a composite spinning strand, and are immediately inputted into the holder groove 6 of the capturing holder 3. The ratio of the width of the holder groove 6 near the in-take openings 7 and the outlet width of the holder groove 6 is 2.0-3.0. The negative pressure airflow in the holder 6 guides a left ribbon-like wool strand edge fiber and a right ribbon-like wool strand edge fiber to closely contact with the composite spinning strand stem. Before the wool strand edge fibers, which are separated from the front roller nip, enter the in-take opening 7, the ribbon-like cotton strand edge fibers are cohered with the hairiness on the rotating surface of the composite spinning strand, which captures strand fibers escaped from the front roller nip. When the composite spinning strand moves to a section of the holder groove 6 corresponding to the position of the in-take opening 7, the hairiness on the surface of the composite spinning strand is stretched by the negative pressure of the in-take opening 7, so as to closely contact with an internal wall of the wind in-taker and the internal wall of the holder groove 6 and be held by the wind in-taker and the internal wall of the holder groove 6 with friction. The hairiness is tightly wound on the rotating stem of the composite spinning strand for fixing the wool fibers captured and eliminating the hairiness on the surface of the composite spinning strand main body. The composite spinnin strand is outputted to form a high qualified worsted composite bobbin yarn from the outlet of the holder groove 6, and finally wound on a yarn bobbin by a pigtail guider, a steel ring and a traveler. According to experimental results, compared with conventional ring-spun worsted composite yarn, 20 Nm worsted composite bobbin yarn prepared by the present invention is improved in that 3 mm hairiness index is decreased by 64%, gram-weight per 100 m is increased by 3.3%, and yarn strength is increased by 5.4%. Thereof, product quality is significantly improved.

Preferred Embodiment 3

(11) Improve Product Quality of Ring-Spinning During Long Staple Ramie Spinning.

(12) For a ramie long fiber ring frame, a long staple ramie one-pipe-per-spindle sucking pipe system is replaced by the sucking pipe 8 whose cross-section is pear-shaped. The pneumatic guiding and capturing apparatus is mounted on the sucking pipe 8 through the base 5, and connects the sucking pipe 8 to the wind in-taker inside the capturing holder 3. A long staple ramie roving enters a drawing system of the long staple ramie ring frame a horn-shaped opening feeder. After being drafted by the drawing system, the ramie roving is outputted to form a ribbon-like strand from a front roller nip outlet comprising a front rubber roller and a front roller. The ribbon-like strand outputted is twisting for forming a spinning strand, and is immediately inputted into the holder groove 6 of the capturing holder 3. The ratio of the width of the holder groove 6 near the in-take openings 7 and the outlet width of the holder groove 6 is 1.1-1.5. The negative pressure airflow in the holder groove 6 guides a left ribbon-like ramie strand edge fiber and a right ribbon-like ramie strand edge fiber to closely contact with the spinning strand stem. Before the edge ramie fibers, which is separated from the front roller nip, enters the in-take opening 7, the strand edge fibers are engaged with the hairiness on the rotating surface of the spinning strand, which captures the edge fibers escaped from the front roller nip. When the spinning strand moves to a section of the holder groove 6 corresponding to the position of the in-take opening 7, the hairiness on the surface of the spinning strand is stretched by the negative pressure of the in-take opening 7, so as to closely contact with an internal wall of the wind in-taker and the internal wall of the holder groove 6 and be held by the wind in-taker and the internal wall of the holder groove 6 with friction. The hairiness is tightly wound on the rotating stem of the spinning strand for fixing the ramie fibers captured and eliminating the hairiness on the surface of the spinning strand main body. The spinning strand is outputted to form a high qualified ramie bobbin yarn from the outlet of the holder groove 6, and finally wound on a yarn tube by a pigtail guider, a steel ring and a traveler. According to experimental results, compared with conventional ring-spun ramie yarn, 38 Nm ramie bobbin yarn prepared by the present invention is improved in that 3 mm hairiness index is decreased by 57%, gram-weight per 100 m is increased by 2.1%, and yarn strength is increased by 4.7%. Thereof, product quality is significantly improved.

(13) One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting.

(14) It will thus be seen that the objects of the present invention have been fully and effectively accomplished. Its embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.