WO2012085929A2 - Procédé et appareil de cardage de fibres discontinues - Google Patents

Procédé et appareil de cardage de fibres discontinues Download PDF

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Publication number
WO2012085929A2
WO2012085929A2 PCT/IN2011/000856 IN2011000856W WO2012085929A2 WO 2012085929 A2 WO2012085929 A2 WO 2012085929A2 IN 2011000856 W IN2011000856 W IN 2011000856W WO 2012085929 A2 WO2012085929 A2 WO 2012085929A2
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WO
WIPO (PCT)
Prior art keywords
carding
air
fibres
cylinder
fibers
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Ceased
Application number
PCT/IN2011/000856
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English (en)
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WO2012085929A3 (fr
Inventor
Kannan Lakshminarayan
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to US13/995,338 priority Critical patent/US20140304950A1/en
Publication of WO2012085929A2 publication Critical patent/WO2012085929A2/fr
Publication of WO2012085929A3 publication Critical patent/WO2012085929A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/08—Carding machines with flats or like members or endless card sheets operating in association with a main cylinder
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/40—Feeding apparatus
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/76—Stripping or cleaning carding surfaces; Maintaining cleanliness of carding area
    • D01G15/80—Arrangements for stripping cylinders or rollers

Definitions

  • the present invention relates to a method and apparatus of carding staple fibres like cotton. More particularly, the present invention is directed to an apparatus for carding of staple fibres with minimum number of moving parts and to reduce the need for close tolerances, especially where moving parts are involved, in order to improve the manufacturability of the apparatus. Advantageously, the present invention minimizes the damage to the fibres so that they retain their natural and desirable properties. DESCRIPTION OF PRIOR ART
  • Carding is a process that takes tufts of fibres as input, removes the trash and short fibres contained in them and individualizes the fibres to finally deliver a uniform web of these individualized fibres.
  • the tufts of fibres are fed to the apparatus by a cylindrical rotating member termed as feed-roller and a specially contoured stationary member termed as feed-table that presses against the feed-roller.
  • feed-roller rotates slowly, the tufts of fibres are delivered at a slow speed while being firmly gripped between the feed-roller and feed-table.
  • tufts are stripped off by a rotating cylindrical member with pins on the surface, called licker-in, which rotates with a surface-speed much higher than that of the feed-roller, resulting in opening of the tufts.
  • the pins of the rotating licker-in pass the feed-roller before passing the feed-table.
  • the tufts gripped at the nip between these two components are impacted by the pins.
  • the intensity of this impact is enhanced by two aspects: a) Sudden change in direction of movement of the tufts on account of the sharp difference between the direction in which the nip feeds the tufts vis-a-vis the direction in which the pinned surface conveys the tufts b) An extended 'nose' of the feed-table that constrains the tufts to remain close to the pinned surface of the rotating 'licker-in' cylinder to break down the tufts.
  • the licker-in is clothed with relatively coarse and spaced-out pins, and made to run at a speed that is in between that of the slow feed-roller and the fast NAME OF THE APPLICANT: L. KANNAN
  • a two-stage gradation in tuft-opening is achieved to contain the damage - first from the feed-roller to the licker-in, and then from the licker-in to the carding cylinder.
  • Coarse-trash is dropped beneath the licker-in chiefly on account of gravity, aided by mechanical elements like mote-knives.
  • these fibres are stripped off from the licker-in by a closely placed rotating member called carding cylinder, which has an even higher surface speed and much more closely-spaced finer pins leading to further opening of the tufts.
  • the fibres are conveyed by these pins towards a plurality of elongated pinned members, called flats, which are placed close to the carding cylinder.
  • the flats are either stationary or move very slowly compared to the fast surface speed of the cylinder.
  • the entanglement of small tufts between the pins of the flats and those of the cylinder cause the separation of fibres from each other and the separation of finer trash particles from the fibres. Trash and short fibres tend to get embedded in the pinned surfaces of the flats, while the longer (useful) fibres tend to travel with the cylinder surface.
  • flats have to be cleaned of the trash and short fibres thus collected. Either the machine has to be stopped periodically for this or a complicated and costly arrangement of "revolving flats" is used so that the flats can be cleaned without stopping the machine.
  • the individualized fibres, from which the trash and short fibres have been removed, are then captured by a doffer.
  • the doffer roller is another cylinder with pinned surface that is set in close proximity to the carding cylinder, but moves at slower surface speed.
  • the fibres transferred from the cylinder to the doffer are then transferred to a succession of doffing rollers moving at progressively slower surface-speeds.
  • the stream of fibres is removed from the last of these doffing rollers to be condensed into a carded sliver.
  • Blowing air or applying suction to remove trash is disclosed in GB931907, GB2375355, ⁇ 241397, US4057877, US4815170, US6477742, US6516497 and several other places in prior art.
  • forced draught of air requires substantial power, apart from greater complexity in construction in order to provide leak-free enclosures and ducts. It is best if trash removal is inherent to the core operation of the carding machine without need to forcibly create air-currents through dedicated other means.
  • US5016321, US5111551, US5272791, US4712276 and US4219908, US6516497 are other instances that illustrate this approach to improvement in performance. It is obvious that all these methods come with significantly increased complexity, costs and performance overheads.
  • GB2003202, US4542560, US6065190, US6568037, US7730591, WO9700983 illustrate different methods around this idea. While such inventions are directed at improving the performance of the carding machine by adding additional components, it is also recognized that the machine is very bulky, heavy and entails expensive manufacturing operations to achieve acceptable levels of precision. Several efforts have been made to simplify the design, reduce the size and weight of different components or find alternate ways of achieving some of the functionalities that entail less precision and manufacturing difficulty. ⁇ 208099 seeks to reduce the diameter of the carding cylinder from the commonly used 1000mm to nearly 700mm, and use fibre-reinforced plastics instead of cast iron.
  • US 5295284 seeks to achieve manufacturing ease and improved precision by reducing the working width to 500mm, instead of the conventional 1000mm.
  • US5930871 seeks to eliminate the doffing roll by providing suction to doff fibres away from the carding cylinder onto a perforated roll.
  • the need for a close-set 'nose' on the feed- table downstream of the feeding nip is also redundant, since severe action of the pins on the fibres is not required to break down the tufts.
  • the geometry of the nose typically needs to be customised to suit the length of fibre being processed. Eliminating the relevance of the nose thus makes for a more robust design that can accommodate varying fibre lengths.
  • the feed table is typically curved to take the radius of the feed roller close to the nip, to provide for better grip over the fibres. In the conventional configuration, this curvature causes the input material to advance in a direction opposite to the direction in which the impacting pins approach the nip.
  • the diameter (d) of the carding cylinder is reduced to about a fourth of that common in conventional carding machines, while the angular speed ( ⁇ ) is increased by the same factor so that the surface speed (v) remains unchanged. While this leaves the carding efficacy - primarily related to the peripheral speed (v) - unchanged, it has a profound effect on the radial force (F) acting on the materials in the entrained airstream.
  • This force (F) is amplified by the factor by which the diameter (d) is reduced, which is the same as the factor by which the angular speed (co) is increased. Consequently, radial movement of entrained particles is amplified.
  • the longer carded fibres are held close to the surface of the carding cylinder by the retaining forces of the pins, whose inclination is typically in the forward direction.
  • the airstream develops two clear zones downstream of the flats - one closer to the surface of the cylinder where the carded long fibres are entrained, and one farther away where other extraneous matter (trash) is entrained.
  • the airstream Downstream of this, the airstream is enclosed by a sheet that converges airstream towards a narrow exit.
  • the other boundary of the exit emerges from an air-deflecting element that is set close to the rotating cylinder.
  • the edge of this air-deflecting element causes a sharp diversion of the airstream towards the exit.
  • This causes substantial part of the entrained long fibres to migrate along with the airstream towards the exit.
  • the exit is substantially blocked by a perforated roller, whose perforations allows free passage to air but would cause the entrained fibres to deposit on its surface. By rotating this perforated roller at steady speed, a web of required density is delivered.
  • the surface speed of the perforated roller is kept much slower than that of the carding cylinder to obtain a web of adequate density that result in a coherent web.
  • this causes deposition of multiple layers of fibres in the web, thereby compensating for momentary variations in rates of fibre deposition, leading to web of enhanced uniformity.
  • the spot of deposition of fibre is determined by the flow of air in which it is entrained. Since air tends to flow preferentially in a direction of lower resistance to its flow, regions where fibre deposition is lower would attract more air and hence, more fibre deposition. This effect further enhances the uniformity of the web.
  • the setting of the air-deflection element and the number of such elements plays an important role in the extent of recirculation of fibres.
  • PROVISIONAL APPLICATION NO: 3885/CHE/2010 DATED DECEMBER 20, 2010 effectively carry out doffing without needing very close settings. Reducing recirculation enables enhanced production rates.
  • recirculation creates a blanket of fibres around the carding cylinder which acts as a reserve stock. This is advantageous in smoothening momentary variations in fibre feed-rate and ensuring that the delivered web is uniform.
  • an apparatus for carding staple fibres comprising:
  • a feeding arrangement with a feed table and a feed roller for feeding tufts of
  • an air guiding element to enclose the unconstrained air stream and direct it
  • the diameter of the said carding cylinder is in the range of 200mm to 300mm and the rotational speed is between 1200 to 1500 revolutions per minute.
  • feed roller is pinned, knurled or has straight or helical flutes.
  • first of at least one of the said air deflecting elements comprising a surface with a blade edge is positioned relative to the said rotating carding cylinder such that the said blade edge is located in proximity to the pinned surface of the said carding cylinder.
  • the said one or more carding flats has pin profile and pin-densities which do not allow the accumulation of fibres and trash.
  • the above said invention further comprises a surface with knife-edge, positioned immediately after the said feeding arrangement.
  • the above said invention further comprising a trash separation plate positioned in the unconstrained airstream downstream of the said carding flats, such that the leading edge of the said trash separation plate is positioned between the radially farther zone of the airstream around the said carding cylinder where trash particles are entrained, and the radially proximate zone of the airstream around the said carding cylinder, where long fibers are entrained.
  • the staple fiber being fed is cotton with density of tufts less than 0.4g/cc. It is another aspect of the present invention, wherein strong radial forces are generated by rotating carding cylinder with diameter in the range of 200mm to 300mm at the rotational speeds lying between 1200 to 1500 revolutions per minute.
  • uniformity of the web is enhanced by setting the at least one air-deflecting element at a farther setting from the said carding cylinder, so that a greater number of fibers re-circulate, building up a reserve-stock of recirculating fibers that smoothen momentary variations in rate of feed of fibers.
  • Figure 1 Illustrates the carding machine existing in the prior art.
  • Figure 2 Illustrates the carding machine according to the present invention.
  • Figure 3 Illustrates isometric view of the carding machine according to the present invention.
  • Figure 4 Illustrates the detailed view of the carding flats according to the present invention.
  • NAME OF THE APPLICANT L. KANNAN
  • FIG. 1 shows, in schematic form, a prior art for the conventional carding apparatus.
  • the tufts of fibres in the form of lap is guided by the feeding arrangement comprising stationary feed table 1 and rotatable feed roller 2 to a licker-in roller 16.
  • the tufts of fibres that are firmly gripped between feed table 1 and feed roller 2 are stripped off by the pins of the licker-in cylinder 16 which rotates at a surface speed higher than that of the feed roller 2 resulting in opening of the tufts.
  • the tufts are then passed on to the carding cylinder 7 from the licker-in cylinder 16.
  • the revolving flats 4 in co-operation with the carding cylinder 7. break down and card tufts into individual fibres. These individual fibres are then transferred from the surface of the carding cylinder 7 onto a doffer roller 17 which rotates at a relatively lower surface speed than that of the carding cylinder 7 to form a continuous web of card sliver.
  • FIG. 2 schematically shows the main working elements of a carding apparatus for carding of staple fibres.
  • the carding apparatus essentially consists of a feeding arrangement which in particular contains a stationary feed table 1 and a rotating feed roller 2; a carding cylinder 7 operating in cooperation with one or more of carding flats 4 and an air guiding element 6; and a doffing system which contains at least one air deflection element 8 to deflect air onto the perforated roller 10.
  • the feeding arrangement consists of a rotating feed roller 2 rotating in a clockwise direction and working in co-operation with the feed table 1 to guide the loose tufts 14 towards the surface of the carding cylinder 7.
  • the carding pins 9 are located on the carding cylinder 7 and are inclined towards the rotation of the carding cylinder 7.
  • the feed table 1 is positioned before the feed- roller 2 with respect to the direction of approach of carding pins 9 (as shown in figure 4) so as to NAME OF THE APPLICANT: L. KANNAN
  • PROVISIONAL APPLICATION NO: 3885/CHE/2010 DATED DECEMBER 20, 2010 reduce the damaging impact of the carding cylinder 7 on the fibres that are in the grip of the feeding arrangement.
  • One or more of the carding flats 4a, 4b, 4c is located downstream to the feeding mechanism and above the periphery of the carding cylinder and working in co-operation with the carding cylinder 7 rotating in anti-clockwise direction.
  • the diameter of the carding cylinder 7 is lower than the diameter of the conventional carding cylinder used in the prior art.
  • the diameter of the carding cylinder in the present invention is preferably between 200mm to 300mm.
  • the rotational speed of the carding cylinder 7 is preferably between 1200 to 1500 revolutions per minute in order to maintain the peripheral velocity of the present day carding cylinder.
  • the increase of the speed of rotation of the carding cylinder correspondingly increases the radial force of the circumferential airstream generated by the rotation of the carding cylinder 7.
  • the carding pins located on the surface of the carding flats 4 have self cleaning pin profiles and pin densities which allow the fibres to pass through them without being lodged between the carding pins.
  • Carding flats 4a, 4b, 4c have progressively increasing pin densities (as shown in the figure 4). For example, pin density of the carding flat 4a that is proximate to the feed roller 2 is less when compared to the pin density of the carding flat 4c located farther from feed roller 2. This increase in pin density in the successive carding flats enhances the intensity of carding as the tuft size breaks down to smaller and smaller size, ensuring complete carding in a short distance of travel. Such a gradual progression of carding intensity may also be achieved by positioning successive flats closer to the surface of cylinder 7.
  • the preferable number of carding flats is 2 to 4 wherein a gap of preferably between 1 to 3 mm circumferentially long is provided between the adjacent carding flats for radially expelling short fibres 15 that are held weakly, without releasing the long fibres 18 that are held strongly, due to engagement with multiple pins 9 on the carding cylinder 7.
  • a trash separation plate 5 is positioned downstream of one or more of the carding flats, such that the leading edge of the trash separation plate 5 is positioned between the radially farther zone of the airstream around the carding cylinder 7 where trash particles 13 are entrained, and the NAME OF THE APPLICANT: L. KANNAN
  • An air-guiding element 8 is located below the carding cylinder 7 and downstream the trash separation plate 5 to guide the entrained air towards the doffing roller 10.
  • the doffing system consists of at least one air deflecting element 8 to deflect air onto the perforated roller 10.
  • the air deflecting element 8 is a surface with a blade edge positioned relative to the rotating carding cylinder 7 in such a way that the blade edge is located in proximity to the carding cylinder 7.
  • Secondary air deflection elements 8b are positioned • successively after the first air deflecting element 8a.
  • the carding apparatus further comprises a surface with knife-edge 3, positioned immediately after feeding arrangement and before the carding flats 4.
  • loose tufts 14 are fed through the feeding arrangement consisting of stationary feed table 1 and rotatable feed roller 2 rotating in clockwise direction.
  • Feed table 1 operates in cooperation with the feed roller 2 and directly feeds loose tufts 14 to the carding cylinder 7 rotating in the opposite direction to that of the feed roller 2.
  • the tufts are gripped at the nip between these two components and are impacted by the carding pins 9 in a direction that aligns with the direction in which the tufts are already being fed. This reduces the stresses on the fibres when they are transferred from the slow feed roller to the fast-moving cylinder.
  • the licker-in rotating with intermediate speed is eliminated entirely, to transfer fibres directly from the feeding arrangement to the carding cylinder.
  • the tufts used as a raw material for carding apparatus can be selected from any one of the staple fibres selected from silk, banana-fibre, jute, pineapple-fibre, cotton, wool, flax, hemp or synthetic fibre.
  • more than one type of fiber may be blended if they are of compatible staple lengths and other fiber properties.
  • the staple fibre used is cotton with a density less than 0.4g/cc.
  • the diameter of the carding cylinder 7 is reduced by about four folds in comparison with the diameter of conventional carding cylinder.
  • the rpm (rotations per minute) of the lower diameter carding cylinder needs to be increased to around 1200-1500 rpm.
  • the increased rpm of the carding cylinder 7 leads to a corresponding increase in the radial forces acting upon the material being processed. These increased radial forces compel the unwanted material to be thrown out of the entrained air.
  • the difference in the physical properties and differing behaviour of the unwanted material entrained in the air stream leads to the unwanted material taking differing trajectories that gradually separates them from the carding cylinder.
  • the unwanted material generally contains coarse trash, fine trash and short fibres which need to be separated from the preferred output which is long fibres 18.
  • long fibres tend to stay close to the surface of the carding cylinder 7 and short fibres 15 tend to fly radially away from the carding cylinder 7.
  • Coarse trash particles are influenced primarily by their velocity and the effect of gravity, rather than by effects of air stream. Finer trash particles are affected by both gravity and air stream, and hence tend to follow a trajectory that gradually diverges from the surface of the carding cylinder 7.
  • Short fibres 15 tend to fly away radially from the carding cylinder 7 through the gaps existing between the carding plates 4. Since the short fibres 15 are not retained by the pin-profiles, they are free to fly away as they do not lodge in the carding flats. So, further cleaning process for the flats is avoided.
  • the entrained air with fine trash 13 moves downstream of carding flats 4 to a zone wherein the air entrained by rotation of carding cylinder 7 is unconstrained.
  • the trash separation plate 5 positioned in the un-constrained airstream downstream of the carding flats 4 diverges' a substantial part of the air stream containing finer trash 13 away from the carding cylinder 7 which is then collected in a trash collector (not shown in the figure).
  • the distance and orientation of positioning of trash separation plate 5 is optimized by trial-and-error based on the nature of fibre and trash being processed.
  • the residual air entraining the long fibres 18 is guided by the air guiding element 6, positioned below the carding cylinder 7, towards perforated roller 10 rotating in the clockwise direction for doffing.
  • the air guiding element 6 is provided to gently converge the entrained air towards the preferred exit.
  • the entrained air is deflected away from the carding cylinder 7 by at least one of the air deflection elements 8;
  • the first air. deflection element 8a is contoured with a blade edge such the blade edge is located in proximity to the carding cylinder 7 to deflect the entrained air with long fibres 18 away from the carding cylinder 7 and towards the perforated roller 10.
  • the perforated roller 10 is set rotating to convey the web of deposited fibers, in which action it may be aided by a co-operating crush-roller 11 or by another perforated roller 10.
  • the deflection of substantial air stream by at least one air deflecting element leads to a sudden drop in pressure in a zone immediately after the air deflection element. This drop in pressure causes widening of air stream which sucks out most of the re-circulating fibres away from the surface of the carding cylinder 7, facilitating easy doffing by a next air-deflection element 8b.
  • the positioning of at least one of the air deflection elements 8 is optimized in such a way that it allows most of the long fibres 18 to be deposited on the perforated roller 10 and at the same time build up a reserve-stock of re-circulating fibres that smoothen momentary variations in rate of feed of fibres.
  • a plurality of secondary air deflecting elements 8b can be positioned successively after the first air deflection element 8a to enhance the deflection of air and thus avoiding re-circulation of fibres towards the carding cylinder 7.
  • the air deflected towards the perforated roller 10 by at least one of the air deflecting elements 8 percolates through the perforated roller 10.
  • the perforated roller 10 acts as a filter by allowing the air to pass through and simultaneously capturing the long fibres 18 on its surface.
  • Uniformity of the web deposited on the perforated roller 10 is enhanced by successive deposition of successive layers of long fibres 18 on the surface of the perforated roller 10 (as shown in figure 3), preferentially in areas with lesser densities of deposition, on account of reduced flow resistance leading to stronger air stream directing fibres towards those regions.
  • Uniformity of the web deposited on the perforated roller 10 is enhanced by successive deposition of multiple layers of fibres on the surface of the perforated roller 10, by rotating perforated roller 10 at slow peripheral speed in relation to that of carding cylinder 7.
  • the movement of fibres and trash in the entrained air is selectively enhanced by the application of blowing air.
  • the movement of fibres and trash in the entrained air is selectively enhanced by the application of suction.
  • the main advantage of the present carding apparatus is that it simplifies the carding apparatus by eliminating the need of a licker in roller and a doffing roller. As a result, not only are a number of components minimized, several close tolerances required in the conventional machines are also relieved, thereby reducing the complexity of manufacture.
  • the application of this apparatus is not limited to carding of staple fibres to make slivers, but can be extended to production of non-woven webs.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

La présente invention concerne un procédé et un appareil de cardage de fibres discontinues, comme le coton. L'invention concerne plus particulièrement un appareil de cardage de fibres discontinues comportant un nombre minimum de pièces mobiles et permettant de réduire la nécessité de tolérances serrées, en particulier en ce qui concerne les pièces mobiles, afin d'augmenter la facilité de fabrication de l'appareil. La densité des touffes qui arrivent dans la cardeuse est réduite. Le diamètre du cylindre de cardage est réduit, et sa vitesse de rotation est augmentée de façon correspondante, pour maintenir la vitesse périphérique. Un élément de guidage d'air et au moins un élément déflecteur d'air sont utilisés pour capturer les fibres longues sur un rouleau perforé. Cette configuration permet d'éliminer les pièces mobiles aux tolérances serrées et de simplifier la conception. De façon avantageuse, la présente invention réduit au minimum la détérioration des fibres de sorte qu'elles conservent leurs propriétés naturelles recherchées.
PCT/IN2011/000856 2010-12-20 2011-12-14 Procédé et appareil de cardage de fibres discontinues Ceased WO2012085929A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/995,338 US20140304950A1 (en) 2010-12-20 2011-12-14 Method and apparatus for carding of staple fibers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN3885CH2010 2010-12-20
IN3885/CHE/2010 2010-12-20

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WO2012085929A2 true WO2012085929A2 (fr) 2012-06-28
WO2012085929A3 WO2012085929A3 (fr) 2012-08-23

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CN109137151A (zh) * 2018-08-21 2019-01-04 安徽世倾环保科技有限公司 一种用于除尘器滤料的生产设备
CN113046869A (zh) * 2021-04-27 2021-06-29 西藏圣信工贸有限公司 牦牛绒梳理装置
CN114703549B (zh) * 2022-04-27 2023-04-21 阿瓦提新雅棉业有限公司 纤维主体长度≥35mm的机采长绒棉原棉生产方法

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DE102005038419A1 (de) * 2005-08-12 2007-02-15 Maschinenfabrik Rieter Ag Reinigungsvorrichtung für eine Textilmaschine
DE502006008525D1 (de) * 2005-09-26 2011-01-27 Rieter Ag Maschf Vorrichtung zum verarbeiten von fasern an der trommel einer karde
DE102006045047A1 (de) * 2006-09-21 2008-03-27 TRüTZSCHLER GMBH & CO. KG Vorrichtung an einer Spinnereivorbereitungsmaschine, insbesondere Karde, Krempel o. dgl., bei der eine garnierte, schnellrotierende Walze mindestens einem garnierten Bauteil in einem Abstand gegenüberliegt

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Publication number Priority date Publication date Assignee Title
CN114481374A (zh) * 2022-02-16 2022-05-13 黑龙江鑫罗商贸有限公司 一种羊毛加工方法

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