CA1270112A - Method and apparatus for opening a sliver - Google Patents
Method and apparatus for opening a sliverInfo
- Publication number
- CA1270112A CA1270112A CA000473379A CA473379A CA1270112A CA 1270112 A CA1270112 A CA 1270112A CA 000473379 A CA000473379 A CA 000473379A CA 473379 A CA473379 A CA 473379A CA 1270112 A CA1270112 A CA 1270112A
- Authority
- CA
- Canada
- Prior art keywords
- sliver
- points
- speed
- roll
- feeding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/30—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls
- D01H4/32—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls using opening rollers
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G13/00—Mixing, e.g. blending, fibres; Mixing non-fibrous materials with fibres
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G9/00—Opening or cleaning fibres, e.g. scutching cotton
- D01G9/06—Opening or cleaning fibres, e.g. scutching cotton by means of toothed members
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Method and apparatus are provided for opening a sliver for dispersion in staple. The method features continuously tearing, without compression, the sliver into a plurality of filament bundles, each of a smaller cross section than that of the sliver. The apparatus features a plurality of points mounted for rotation about a common axis, means for feeding the sliver at a first speed into contact with one of the points, and means for rotating the points at a surface speed at least 290 times faster than the first speed to successively tear the sliver into filament bundles.
Method and apparatus are provided for opening a sliver for dispersion in staple. The method features continuously tearing, without compression, the sliver into a plurality of filament bundles, each of a smaller cross section than that of the sliver. The apparatus features a plurality of points mounted for rotation about a common axis, means for feeding the sliver at a first speed into contact with one of the points, and means for rotating the points at a surface speed at least 290 times faster than the first speed to successively tear the sliver into filament bundles.
Description
~Z7~1~2 METHOD AND APPARATUS FOR OPENING A SLIVER
BACKGROUND OF T~E INVENTION
Field of the Invention The present invention relates to a method and apparatus for opening a sliver for dispersion in staple;
more particularly it relates to a method and apparatus for opening a sliver comprising nylon filaments, some of which are coated with silver, for dispersion .in nylon staple.
The Prior Art The use of conductive filaments in yarn to provide antistatic properties is known. Specifically, it is known to utilize ~ilver-coated nylon filaments in nylon yarn to reduce the tendency of the yarn to accumulate static charge. A sliver which includes these filaments is ordinarily broken into smaller pieces for dispersion in nylon staple. By sliver is meant a strand or rope of noncontinuous textile filaments produced by a carding or combing machine and ready for drawing, roving or spinning, etc., and including untwisted or false twisted strand.
Equipment for breaking a sliver for introduction into the staple line is available from Rhone Poulenc and comprises two pairs of rolls. The first pair of rolls are nip feed rolls between which the sliver is fed to a second pair of rolls which are running at a faster speed (up to 25 times the speed of the feed rolls). As the sliver feeds between the second pair of rolls, the speed differential of the pairs of rolls causes the sliver to break off in pieces. Compression of the sliver by the second pair of rolls often causes filament chunks to break off that have some cross sectional areas as large as that of the original sliver and/or that have a length as large as 6 to 8 inches (15 to 20 cm). These broken pieces of sliver are then aspirated to mix with the air-conveyed staple subsequent to cutting and prior to baling of the staple.
The bale customer ordinarily opens, blends and rebales these initial bales of yarn. The yarn from several of the blended bales may then be hand fed onto a belt which conveys the yarn to a carding roll. Just before entering . ~
~.
: .
,.
~Z7~ L2 the carding roll, there normally is an electronic detector which automatically shuts down the carding machinery in response to unacceptable levels of metal which could damage the carding roll. With the sliver breaker just described, this occurs with unacceptable frequency. The present invention was designed to overcome these problems of the prior art.
SUMMARY OF THE INVENTION
The present invention provides method and apparatus for opening a sliver for dispersion in staple.
The apparatus comprises a plurality of points mounted for rotation about a common axis. The rotational distance between successive points is at least about 4 mm, preferably about 5.8 mm. At distances of less than 4 mm, the sliver tends to be carried by the points without tearing. The largest distance between successive points is determined by how long the pieces of sliver may be. It is preferred that the rotational distance between successive points be no more than 12.5 mm. The apparatus further comprises means for feeding the sliver at a first speed into contact with one of the points, and means for rotating the plurality of points at a surface speed at least about 290 times faster than the first speed to successively tear, without compression, the sliver into a plurality of filament bundles, each of smaller cross section than that of the sliver. The speed of the sliver feeding to the points may be up to 30 ft/min (0.15 m/s), more preferably from 10 to 25 feet/min (0.051 to 0.13 m/s). The preferred means for feeding comprises a feed roll with at least one associated idler roll, preferably two, with a sliver passing between the feed roll and idler rolls. The feed roll is rotated when the apparatus is operational to feed the sliver into contact with one of the points.
It is preferred that the plurality of points be mounted to the surface of a roll which rotates in the direction of sliver feed- The points may comprise a plurality of needles mounted with their pointed end out and preferably in a plurality of rows which are substantially ; .. .
. . .
~2~7~1~Z
parallel to the central axis of the roll. Alternatively, the point`s may comprise the teeth of at least one band saw blade mounted to the surface of the roll. The blade or blades may be mounted, preferably in grooves, spirally or in rows on the roll surface. When the blades are mounted in rows it is preferred that the rows be substantially perpendicular to the central axis of the roll.
The speed of succession of the plurality of points must be sufficiently faster than the speed of the sliver feeding to the points that the sliver tears without being carried by succeeding points. This corresponds to a surface speed of at least about 8900 ft/min (45 m/s). The most preferred speed is about 9000 ft/min (46 m/s).
The method of -the present invention comprises continuously tearing, without compression, the sliver into a plurality of filament bundles, each of a smaller cross section than that of the sliver. It is preferred that the tearing step comprises pricking the sliver with the plurality of points in succession and that the speed of succession of the plurality of points be sufficiently faster than the speed of the sliver feeding to the points that the sliver tears without being carried by succeeding points. Again, the rotational distance between successive points is preferably at least about 4 mm, and the rotational speed of each of the points is at least 290 times faster than the speed of the sliver feeding to the points.
Alternatively, the method of the present invention for opening a sliver for dispersion and staple comprises the steps of (a) continuously feeding the sliver at a first speed to the first of a plurality of points; (b) pricking, without compression, the sliver with said first point to separate a filament bundle of smaller cross section than that of the sliver for subsequent removal; and (c) pricking, without compression, the sliver with succeeding points to separate successively a plurality of the filament bundles for removal. It is preferred that the plurality of points rotate about a common axis with the speed of the .~
,. . ~
.. ' ~ :
~- .
1~70~L~Z
points being at least about 290 times faster than th0 speed of feeding the sliver to the points.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a front view, partially cut away, of the sliver opener 10 of the present invention.
Figures 2A and 2B are, respectively, front and side views of roll 20 with needles 21.
Figure 2C is an enlarged view of needle 21 mounted on roll 20.
Figures 3A and 3B are, respectively, front and side views of roll 20' with teeth 21'.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the accompanying drawings, like numbers indicate like apparatus. With reference to Figure 1, side plate 30, which is welded to base plate 31, supports extension plate 15, the conventionally mounted feed roll 16 with associated idler rolls 17 and 17', and roll housing 22. Extension plate 15 has a central hole for seeding funnel 14. Funnel 14 is located in plate 15 by means of an exterior tab 2G (unshown) with a hole through which a locating pin (unshown) extending from plate 15 fits. The sliver exit end of funnel 14 preferably is canted up to 15 towards feed roll 16. Feed roll 16 is driven by motor 18 to rotate in the direction of the arrow. Associated idler rollers 17 and 17' are spring loaded to urge upward and in contact with sliver 11 which passes between each of the idler rollers and feed roll 16. Roll 20 is mounted in housing 22 on a shaft (unshown), the other end of which is conventionally mounted to a gear belt pulley which, in turn, has a gear belt driven by a second motor 19.
- Rotation of roll 20 in housing 22 is counter clockwise.
The base of roll housing 22 opens into tube 23 for evacuation of sliver particles. Tube 23 passes through an opening in base plate 31 to intersect with air conveyed staple line 25. Air is in~ected into tube 23 at 24 to help evacuate the sliver particles from tube 23 and housing 22.
The sliver particles are aspirated to mix with staple in line 15.
.,.
' .~ ~- .
~27~1~Z
Figures 2A through 2C depict roll 20 with needles 21 pressed therein with the sharper pointed end sticking straight out. In Figure 2A a single row of needles 21 is shown. It is preferred that there be a plurality of rows with the rotational distance between needles being at least about 4 mm. These rows preferably are parallel to the central axis of roll 20, and rotational distance is the shortest distance between rows of needles 21. It is preferred, although not critical, that needles 21 be placed directly behind one another in succeeding rows; in this instance, the rotational distance between needles will be the actual distance between needles in the two rows. The most preferred roll 20 having needles 21 thereon is characterized as follows: The roll has an outer diameter of about 117 mm, a roll surface width of about 22.3 mm, 63 rows of needles, 19 needles per row, rows equispaced 5.81 mm center to center. The 19 needles per row are equispaced within the row and rows of needles are not staggered, but lined up one behind the other. The individual needles extend 4.0 mm from the roll surface. Needles 21 could, of course, be offset in their rows, greater or fewer in number, as desired. The needles could also be angled, the key being that they prick the sliver 11 when it comes into contact therewith.
Figures 3A and 3B depict as alternate pricking means roll 20' with teeth 21'. A groove was precut to spiral around the surface of roll 20'. A band saw blade was placed into the groove with the set screw (unshown) holding the blade from a side of roll 20' at its starting and terminating points. The blade has a plurality of teeth 21' extendin~ outwardly therefrom. In the embodiment depicted, the dimensions of roll 20' are identical to those of roll 20 in Figures 2A and 2B. The blade extends 4.0 mm from the surface of roll 20, 2.0 mm being the extension of teeth 21' from the body of the blade. As shown in Figure 3B, teeth 21' are canted approximately 9 in the direction of rotation.
With reference to Figure 1, sliver opener 10 '' :., .:
~ ~ .
:
' ~27(~
operation is as follows. Sliver 11 is fed through inlet 13 in the top back side of opener 10. Housing/cabinet 12 is opened and sliver 11 pulled through by hand. Sliver guide funnel 14 is removed and sliver 11 hand fed through the funnel allowing approximately 0.75 inch (190 cm) to extend past the exit end of funnel 14. Funnel 14 is placed extension plate 15 and cabinet 12 is closed. ~lectrical leads (unshown) are plugged into the control cabinet for the tow cutter (all unshown) upstream of air conveyed staple line 25. Motor 19 is cut on to start rotation of roll 20. Roll 20 rotates at least greater than 6000 revolutions per minute (rpm) which is approximately 8900 ft/min ~45 m/s) based on a roll diameter calculated from end of pin to end of pin. It is preferred that roll 20 rotate at 6800 rpm, or about 9000 ft/min (46 m/s), since at 6000 rpm sliver 11 occasionally wraps around roll 20. Feed roll 16 may be set to rotate at up to 30 ft/min (0.15 m/s) but is preferably set at between 10 to 25 ft/min tO.05 to 0.13 m/s). Feed roll 16 with associated idlers 17 and 17' pulls sliver 11 from the exit end of funnel 14 and guides it into one of needles 21 on roll 20 (or teeth 21' of roll 20'). Rotation of roll 20 and needles 21 tears sliver 11 into very small filament bundles (of smaller cross section than sliver 11), and slings these sliver particles through the opening in the base of roll housing 22 into air injected tube 23 ~hich carries the particles to be mixed with nylon staple in air conveyed staple line 25 for subsequent baling.
The electrical setup is such that motor 19 must be started prior to feed roll 16 motor 18. In the event sliver 11 becomes entangled or wraps on roll 20 (or 20') and jams, a current monitoring relay (unshown) attached to motor 19 shuts off the power. Feed roll 16 motor 18 is interlocked with the cutter (unshown)- When the cutter is cut off, feed roll motor 18 is also shut off.
Although needles 21 and teeth 21' have been depicted and described as the plurality of points, other types of openers could readily be used as long as sliver 11 . . . .~, :~' ' 3.Z7(:)~12 is pricked to tear without compression. Individual filament lengths within the sliver should be sufficiently short to prevent wrapping around roll 20 or 20' when sliver 11 is pricked. With rolls of the decribed size, a maximum length of about 5 inches ~13 cm) is satisfactory.
" ,.
:
. ' ~ .
.. : -:., .
BACKGROUND OF T~E INVENTION
Field of the Invention The present invention relates to a method and apparatus for opening a sliver for dispersion in staple;
more particularly it relates to a method and apparatus for opening a sliver comprising nylon filaments, some of which are coated with silver, for dispersion .in nylon staple.
The Prior Art The use of conductive filaments in yarn to provide antistatic properties is known. Specifically, it is known to utilize ~ilver-coated nylon filaments in nylon yarn to reduce the tendency of the yarn to accumulate static charge. A sliver which includes these filaments is ordinarily broken into smaller pieces for dispersion in nylon staple. By sliver is meant a strand or rope of noncontinuous textile filaments produced by a carding or combing machine and ready for drawing, roving or spinning, etc., and including untwisted or false twisted strand.
Equipment for breaking a sliver for introduction into the staple line is available from Rhone Poulenc and comprises two pairs of rolls. The first pair of rolls are nip feed rolls between which the sliver is fed to a second pair of rolls which are running at a faster speed (up to 25 times the speed of the feed rolls). As the sliver feeds between the second pair of rolls, the speed differential of the pairs of rolls causes the sliver to break off in pieces. Compression of the sliver by the second pair of rolls often causes filament chunks to break off that have some cross sectional areas as large as that of the original sliver and/or that have a length as large as 6 to 8 inches (15 to 20 cm). These broken pieces of sliver are then aspirated to mix with the air-conveyed staple subsequent to cutting and prior to baling of the staple.
The bale customer ordinarily opens, blends and rebales these initial bales of yarn. The yarn from several of the blended bales may then be hand fed onto a belt which conveys the yarn to a carding roll. Just before entering . ~
~.
: .
,.
~Z7~ L2 the carding roll, there normally is an electronic detector which automatically shuts down the carding machinery in response to unacceptable levels of metal which could damage the carding roll. With the sliver breaker just described, this occurs with unacceptable frequency. The present invention was designed to overcome these problems of the prior art.
SUMMARY OF THE INVENTION
The present invention provides method and apparatus for opening a sliver for dispersion in staple.
The apparatus comprises a plurality of points mounted for rotation about a common axis. The rotational distance between successive points is at least about 4 mm, preferably about 5.8 mm. At distances of less than 4 mm, the sliver tends to be carried by the points without tearing. The largest distance between successive points is determined by how long the pieces of sliver may be. It is preferred that the rotational distance between successive points be no more than 12.5 mm. The apparatus further comprises means for feeding the sliver at a first speed into contact with one of the points, and means for rotating the plurality of points at a surface speed at least about 290 times faster than the first speed to successively tear, without compression, the sliver into a plurality of filament bundles, each of smaller cross section than that of the sliver. The speed of the sliver feeding to the points may be up to 30 ft/min (0.15 m/s), more preferably from 10 to 25 feet/min (0.051 to 0.13 m/s). The preferred means for feeding comprises a feed roll with at least one associated idler roll, preferably two, with a sliver passing between the feed roll and idler rolls. The feed roll is rotated when the apparatus is operational to feed the sliver into contact with one of the points.
It is preferred that the plurality of points be mounted to the surface of a roll which rotates in the direction of sliver feed- The points may comprise a plurality of needles mounted with their pointed end out and preferably in a plurality of rows which are substantially ; .. .
. . .
~2~7~1~Z
parallel to the central axis of the roll. Alternatively, the point`s may comprise the teeth of at least one band saw blade mounted to the surface of the roll. The blade or blades may be mounted, preferably in grooves, spirally or in rows on the roll surface. When the blades are mounted in rows it is preferred that the rows be substantially perpendicular to the central axis of the roll.
The speed of succession of the plurality of points must be sufficiently faster than the speed of the sliver feeding to the points that the sliver tears without being carried by succeeding points. This corresponds to a surface speed of at least about 8900 ft/min (45 m/s). The most preferred speed is about 9000 ft/min (46 m/s).
The method of -the present invention comprises continuously tearing, without compression, the sliver into a plurality of filament bundles, each of a smaller cross section than that of the sliver. It is preferred that the tearing step comprises pricking the sliver with the plurality of points in succession and that the speed of succession of the plurality of points be sufficiently faster than the speed of the sliver feeding to the points that the sliver tears without being carried by succeeding points. Again, the rotational distance between successive points is preferably at least about 4 mm, and the rotational speed of each of the points is at least 290 times faster than the speed of the sliver feeding to the points.
Alternatively, the method of the present invention for opening a sliver for dispersion and staple comprises the steps of (a) continuously feeding the sliver at a first speed to the first of a plurality of points; (b) pricking, without compression, the sliver with said first point to separate a filament bundle of smaller cross section than that of the sliver for subsequent removal; and (c) pricking, without compression, the sliver with succeeding points to separate successively a plurality of the filament bundles for removal. It is preferred that the plurality of points rotate about a common axis with the speed of the .~
,. . ~
.. ' ~ :
~- .
1~70~L~Z
points being at least about 290 times faster than th0 speed of feeding the sliver to the points.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a front view, partially cut away, of the sliver opener 10 of the present invention.
Figures 2A and 2B are, respectively, front and side views of roll 20 with needles 21.
Figure 2C is an enlarged view of needle 21 mounted on roll 20.
Figures 3A and 3B are, respectively, front and side views of roll 20' with teeth 21'.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the accompanying drawings, like numbers indicate like apparatus. With reference to Figure 1, side plate 30, which is welded to base plate 31, supports extension plate 15, the conventionally mounted feed roll 16 with associated idler rolls 17 and 17', and roll housing 22. Extension plate 15 has a central hole for seeding funnel 14. Funnel 14 is located in plate 15 by means of an exterior tab 2G (unshown) with a hole through which a locating pin (unshown) extending from plate 15 fits. The sliver exit end of funnel 14 preferably is canted up to 15 towards feed roll 16. Feed roll 16 is driven by motor 18 to rotate in the direction of the arrow. Associated idler rollers 17 and 17' are spring loaded to urge upward and in contact with sliver 11 which passes between each of the idler rollers and feed roll 16. Roll 20 is mounted in housing 22 on a shaft (unshown), the other end of which is conventionally mounted to a gear belt pulley which, in turn, has a gear belt driven by a second motor 19.
- Rotation of roll 20 in housing 22 is counter clockwise.
The base of roll housing 22 opens into tube 23 for evacuation of sliver particles. Tube 23 passes through an opening in base plate 31 to intersect with air conveyed staple line 25. Air is in~ected into tube 23 at 24 to help evacuate the sliver particles from tube 23 and housing 22.
The sliver particles are aspirated to mix with staple in line 15.
.,.
' .~ ~- .
~27~1~Z
Figures 2A through 2C depict roll 20 with needles 21 pressed therein with the sharper pointed end sticking straight out. In Figure 2A a single row of needles 21 is shown. It is preferred that there be a plurality of rows with the rotational distance between needles being at least about 4 mm. These rows preferably are parallel to the central axis of roll 20, and rotational distance is the shortest distance between rows of needles 21. It is preferred, although not critical, that needles 21 be placed directly behind one another in succeeding rows; in this instance, the rotational distance between needles will be the actual distance between needles in the two rows. The most preferred roll 20 having needles 21 thereon is characterized as follows: The roll has an outer diameter of about 117 mm, a roll surface width of about 22.3 mm, 63 rows of needles, 19 needles per row, rows equispaced 5.81 mm center to center. The 19 needles per row are equispaced within the row and rows of needles are not staggered, but lined up one behind the other. The individual needles extend 4.0 mm from the roll surface. Needles 21 could, of course, be offset in their rows, greater or fewer in number, as desired. The needles could also be angled, the key being that they prick the sliver 11 when it comes into contact therewith.
Figures 3A and 3B depict as alternate pricking means roll 20' with teeth 21'. A groove was precut to spiral around the surface of roll 20'. A band saw blade was placed into the groove with the set screw (unshown) holding the blade from a side of roll 20' at its starting and terminating points. The blade has a plurality of teeth 21' extendin~ outwardly therefrom. In the embodiment depicted, the dimensions of roll 20' are identical to those of roll 20 in Figures 2A and 2B. The blade extends 4.0 mm from the surface of roll 20, 2.0 mm being the extension of teeth 21' from the body of the blade. As shown in Figure 3B, teeth 21' are canted approximately 9 in the direction of rotation.
With reference to Figure 1, sliver opener 10 '' :., .:
~ ~ .
:
' ~27(~
operation is as follows. Sliver 11 is fed through inlet 13 in the top back side of opener 10. Housing/cabinet 12 is opened and sliver 11 pulled through by hand. Sliver guide funnel 14 is removed and sliver 11 hand fed through the funnel allowing approximately 0.75 inch (190 cm) to extend past the exit end of funnel 14. Funnel 14 is placed extension plate 15 and cabinet 12 is closed. ~lectrical leads (unshown) are plugged into the control cabinet for the tow cutter (all unshown) upstream of air conveyed staple line 25. Motor 19 is cut on to start rotation of roll 20. Roll 20 rotates at least greater than 6000 revolutions per minute (rpm) which is approximately 8900 ft/min ~45 m/s) based on a roll diameter calculated from end of pin to end of pin. It is preferred that roll 20 rotate at 6800 rpm, or about 9000 ft/min (46 m/s), since at 6000 rpm sliver 11 occasionally wraps around roll 20. Feed roll 16 may be set to rotate at up to 30 ft/min (0.15 m/s) but is preferably set at between 10 to 25 ft/min tO.05 to 0.13 m/s). Feed roll 16 with associated idlers 17 and 17' pulls sliver 11 from the exit end of funnel 14 and guides it into one of needles 21 on roll 20 (or teeth 21' of roll 20'). Rotation of roll 20 and needles 21 tears sliver 11 into very small filament bundles (of smaller cross section than sliver 11), and slings these sliver particles through the opening in the base of roll housing 22 into air injected tube 23 ~hich carries the particles to be mixed with nylon staple in air conveyed staple line 25 for subsequent baling.
The electrical setup is such that motor 19 must be started prior to feed roll 16 motor 18. In the event sliver 11 becomes entangled or wraps on roll 20 (or 20') and jams, a current monitoring relay (unshown) attached to motor 19 shuts off the power. Feed roll 16 motor 18 is interlocked with the cutter (unshown)- When the cutter is cut off, feed roll motor 18 is also shut off.
Although needles 21 and teeth 21' have been depicted and described as the plurality of points, other types of openers could readily be used as long as sliver 11 . . . .~, :~' ' 3.Z7(:)~12 is pricked to tear without compression. Individual filament lengths within the sliver should be sufficiently short to prevent wrapping around roll 20 or 20' when sliver 11 is pricked. With rolls of the decribed size, a maximum length of about 5 inches ~13 cm) is satisfactory.
" ,.
:
. ' ~ .
.. : -:., .
Claims (13)
1. A method of opening a sliver for dispersion in staple, comprising continuously tearing, without compression, the sliver into a plurality of filament bundles, each of a smaller cross section than that of the sliver, wherein said tearing step, without compression, comprises pricking the sliver with a plurality of points in succession, and wherein said plurality of points is rotated for successive contact with the sliver, the speed of succession of the plurality of points being sufficiently faster than the speed of the sliver feeding to the points that the sliver tears without being carried by succeeding points, the rotational speed of each of said points being at least 290 times faster than the speed of the sliver feeding to the points.
2. The method of claim 1 wherein the rotational distance between successive points is at least about 4 mm.
3. The method of claim 2 wherein the speed of the sliver feeding to the points is up to 30 feet per minute (0.15 m/s) and wherein the plurality of points rotates at a speed of at least about 8900 ft/min (45 m/s).
4. The method of claim 3 wherein the speed of the sliver feeding to the points varies from 10 to 25 ft/min (0.051 to 0.13 m/s).
5. Apparatus for opening a sliver for dispersion in staple, comprising:
a. a plurality of points, mounted for rotation about a common axis, the rotational distance between successive points being at least about 4 mm;
b. means for feeding said sliver at a first speed into contact with one of said points; and c. means for rotating said plurality of points at a surface speed at least about 290 times faster than said first speed to successively tear, without compression, the sliver into a plurality of filament bundles each of smaller cross section than that of the sliver said sliver comprising nylon filaments, some of which are coated with silver.
a. a plurality of points, mounted for rotation about a common axis, the rotational distance between successive points being at least about 4 mm;
b. means for feeding said sliver at a first speed into contact with one of said points; and c. means for rotating said plurality of points at a surface speed at least about 290 times faster than said first speed to successively tear, without compression, the sliver into a plurality of filament bundles each of smaller cross section than that of the sliver said sliver comprising nylon filaments, some of which are coated with silver.
6. The apparatus of claim 5 wherein said means for feeding comprises a feed roll with at least one associated idler roll, said sliver passing between said feed roll and said idler roll, said feed roll being rotated when said apparatus is operational to feed the sliver into contact with one of said points.
7. The apparatus of claim 6 wherein said plurality of points comprises a plurality of needles mounted to the surface of a roll which rotates in the direction of sliver feed.
8. The apparatus of claim 7 wherein said needles are mounted in a plurality of rows which are substantially parallel to the central axis of the roll.
9. The apparatus of claim 5 wherein said plurality of points comprises the teeth of at least one band saw blade mounted to the surface of a roll which rotates in the direction of sliver feed.
10. The apparatus of claim 9 wherein said blade is mounted spirally on said roll surface.
11. The apparatus of claim 9 wherein there are a plurality of blades mounted in a plurality of rows which are substantially perpendicular to the central axis of the roll.
12. A method of opening a sliver for dispersion in staple, comprising feeding the sliver to a plurality of points, and rotating the plurality of points for successive contact with the sliver to prick and thereby tear, without compression, the sliver into a plurality of filament bundles, each of a smaller cross section than that of the sliver, the rotational speed of each of the points being at least 290 times faster than the speed of the sliver feeding to the points.
13. A method for opening a sliver for dispersion in staple, comprising the steps of a. continuously feeding the sliver at a first speed to the first of a plurality of points;
b. moving the first point to prick, without compression, the sliver to separate a filament bundle of smaller cross section than that of the sliver for subsequent removal; and c. moving the succeeding points to prick, without compression, the sliver to separate successively a plurality of said filament bundles for removal;
the speed of said points being at least about 290 times faster than said first speed.
b. moving the first point to prick, without compression, the sliver to separate a filament bundle of smaller cross section than that of the sliver for subsequent removal; and c. moving the succeeding points to prick, without compression, the sliver to separate successively a plurality of said filament bundles for removal;
the speed of said points being at least about 290 times faster than said first speed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58138384A | 1984-02-17 | 1984-02-17 | |
| US581,383 | 1984-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1270112A true CA1270112A (en) | 1990-06-12 |
Family
ID=24324986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000473379A Expired CA1270112A (en) | 1984-02-17 | 1985-02-01 | Method and apparatus for opening a sliver |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0154116B1 (en) |
| JP (1) | JPS60185822A (en) |
| CA (1) | CA1270112A (en) |
| DE (1) | DE3565560D1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1225732B (en) * | 1988-09-01 | 1990-11-26 | Marcello Giuliani | HINGE FOR THE COLLECTION OF FIBERS TO FEED TO THREE SO-CALLED "OPEN-END", WITH INCLINED TEETH OF SOCKETS ALTERNATED TO EXHAUST TEETH |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2130658A1 (en) * | 1971-06-21 | 1973-01-11 | Zinser Textilmaschinen Gmbh | DEVICE FOR OPENING TEXTILE FIBER TAPES |
| GB1599882A (en) * | 1977-06-22 | 1981-10-07 | Platt Saco Lowell Ltd | Open-end spinning |
| CS203501B1 (en) * | 1978-07-14 | 1981-03-31 | Milos Vecera | Method of and apparatus for separating impurities from staple fibres under simultaneous straightening of cleaned fibres in open-end spinning process |
-
1985
- 1985-01-14 DE DE8585100306T patent/DE3565560D1/en not_active Expired
- 1985-01-14 EP EP19850100306 patent/EP0154116B1/en not_active Expired
- 1985-02-01 CA CA000473379A patent/CA1270112A/en not_active Expired
- 1985-02-18 JP JP3014285A patent/JPS60185822A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60185822A (en) | 1985-09-21 |
| EP0154116A1 (en) | 1985-09-11 |
| DE3565560D1 (en) | 1988-11-17 |
| EP0154116B1 (en) | 1988-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1092452A (en) | Multi-component spun yarn, its manufacturing method and equipment | |
| US2438469A (en) | Method and apparatus for converting bulk filament into staples | |
| CA1270112A (en) | Method and apparatus for opening a sliver | |
| US2232496A (en) | Apparatus for producing staple fibers | |
| US4586218A (en) | Chute feed apparatus for a carding machine | |
| US4226077A (en) | Method and apparatus for manufacturing wrapped yarns | |
| US3334532A (en) | Method and apparatus for cutting fiber tow into staple | |
| US4514880A (en) | Formation of nonwoven webs or batts from continuous filament tow or yarn strands | |
| US3750382A (en) | Process and apparatus for feeding fiber in an open end spinning machine | |
| CN115537979B (en) | Embroidery thread preparation equipment and method with flame retardance | |
| US3943690A (en) | Yarn spinning apparatus | |
| EP0106830B1 (en) | Open-end spinning method and device | |
| US2711626A (en) | Method and apparatus for collecting fibrous material and forming it into a strand | |
| US4367084A (en) | Threading means for strand pulling and chopping apparatus | |
| DE2038432A1 (en) | Method and apparatus for open-end spinning | |
| US3959055A (en) | Textile apparatus and process | |
| US2765035A (en) | Apparatus for producing staple fibers | |
| US2834090A (en) | Suction type bobbin stripper | |
| JP2005501184A (en) | Spinning machine method | |
| EP0340630A1 (en) | Residual lap clearing apparatus | |
| CS244401B2 (en) | Staple fibres spinning device | |
| US20030056488A1 (en) | Air-spinning arrangement | |
| CA1237978A (en) | Cutting method and apparatus | |
| US2302354A (en) | Method and apparatus for | |
| US2623585A (en) | Machine for cutting rayon staple |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |