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US3567288A - Pneumatic fiber conveying system - Google Patents

Pneumatic fiber conveying system Download PDF

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US3567288A
US3567288A US3567288DA US3567288A US 3567288 A US3567288 A US 3567288A US 3567288D A US3567288D A US 3567288DA US 3567288 A US3567288 A US 3567288A
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air
fibers
duct
fiber
flow
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Dennis E Wood
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Curlator Corp
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Curlator Corp
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/08—Air draught or like pneumatic arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]

Definitions

  • An air jet is used to divert fibers and air from a trunkline into a branch line to feed the fibers to a card or a machine for forming random fiber webs, etc.
  • the branch line may carry the air and fibers through a trumpet section to a moving foraminous condenser on which the fibers will be deposited While the air is sucked by a fan through the condenser and returned to the trunkline to form the air jet.
  • the trunkline may be of increased diameter just upstream of a branch line to help control the direction of flow of the fibers.
  • the present invention relates to apparatus for transferring fibrous material from a pneumatic conveying duct to equipment such as opening, blending, cleaning, carding, and random fiber web forming machines. More particularly, this invention relates to apparatus for transferring fibers from pneumatic conveying ducts, which have a plurality of branches, one for each of a plurality of carding machines or the like, and automatically controlling the amount of transferred material to each branch, and forming said material, at each branch, into mats of fibers which are uniform in depth, width, and length, and of any desired thickness, and feeding the mat from each branch to the corresponding card or web forming machine.
  • the apparatus used heretofore has employed various means, such as perforated screens disposed adjacent to or in the air stream, flaps, valves, and other mechanical appurtenances, which have been coupled with hoppers, chutes, and the like, for diverting the fiber flow from the pneumatic conveying system.
  • various means such as perforated screens disposed adjacent to or in the air stream, flaps, valves, and other mechanical appurtenances, which have been coupled with hoppers, chutes, and the like, for diverting the fiber flow from the pneumatic conveying system.
  • flaps, condensers, screens and the like interfere with the flow of fibers, causing flocking, and hang-ups; and the structure of the towers or chutes becomes large and costly.
  • Such apparatus moreover, requires periodic surveillance of the working conditions, which is inconvenient and expensive.
  • a prime object of this invention is to provide an apparatus for delivering fibrous material, which is simple in structure, and can control fiber material flow from the main duct of a pneumatic duct system into each of the branches.
  • Another object of the invention is to provide an apparatus for continuously delivering fibrous material from a pneumatic conveying system as a uniform lap to web forming machinery.
  • Another object of the invention is to provide apparatus for not only continuously forming fibrous material into a uniform mat of desired thickness at each of the branches, but for also continuously delivering said mats to Web forming machinery.
  • Another object of the invention is to increase the overall pneumatic line efliciency and supply for a plurality of machines.
  • Another object of the invention is to provide a fiber feeding and distributing system which will minimize the labor required for conventional transfer systems and also eliminate picker and like machines.
  • FIG. 1 is a diagrammatic view illustrating the principle, upon which machines built according to the present invention, operate;
  • FIG. 2 is a velocity diagram of the transfer operation
  • FIG. 3 is a diagrammatic view illustrating a modification of the transfer control apparatus
  • FIG. 4 is a diagrammatic view illustrating another modification of the invention.
  • FIG. 5 is a diagrammatic view illustrating still another embodiment of the invention.
  • FIG. 6 is a side elevation, partly broken away, illustrating how in one embodiment of the invention, the flow control may be incorporated in the feed to a line of carding engines, random web forming machines, or the lik
  • FIG. 7 is a fragmentary diagrammatic view illustrating how the fiber and air supply apparatus may be connected with the pneumatic fiber transport system of the present invention
  • FIG. 8 is a diagrammatic view illustrating how a pneur matic transport system built according to the present invention may be connected to supply fibers to a line of carding machines;
  • FIG. 9 is a fragmentary side view illustrating a further, presently preferred modification of the invention and showing the means controlling delivery of air and fibers from a trunkline to a branch line duct that feeds a random fiber web or other machine;
  • FIG. 10 is a fragmentary plan view of part Of the control means shown in FIG. 9.
  • FIG. 11 is a view on a somewhat reduced scale, looking at the opposite side of the apparatus of FIG. 9, and illustrating further the connection of the feed mechanism with the condenser of the random fiber Web forming machine.
  • the force of fluid in motion is used to transfer fiber from the conveying duct work to the feeding machine, and to control the amount of fiber so delivered.
  • the fiber control elements consist of a duct with both input and output ports, a branch outlet and a fluid control port for each machine.
  • the boundary layer occurs between any surface and a fluid which is in contact with that surface and has a velocity relative to that surface. It is well known that by applying boundary layer suction at the periphery of a diverging passage full expansion of the flow can be achieved. Also, if suction be applied to only one side of the passage, the fluid will adhere to that side. A similar effect can be obtained by injecting a jet of fluid into the boundary layer.
  • the fluid normally divides evenly at the junctures of the arms of the Y with the leg thereof, but if a control jet is forced against the supply flow, before the fluid reaches the enlargement, the total flow will be diverted through the outlet port at the same side of the pipe as that against which the jet forces the fluid. However, because the fluid cannot attach itself to the opposite wall, the flow will only continue through the outlet port as long as there is a control jet present. Should the force of the control jet be reduced, then the flow will divide at the juncture of the arms of the Y with the leg thereof, but only in the proportion that the force of the control jet is decreased.
  • any continuously moving fluid can be controlled by injection of a small amount of fluid into the main stream bound layer. It is not necessary that the control fluid and the main fluid be the same.
  • FIG. 1 is a diagrammatic view illustrating a typical fiber supply control system comprising a pipe constructed according to the present invention, and having a general Y configuration with two arms 11 and 12, and a portion 17 of enlarged cross sectional area upstream of the arms 11 and 12.
  • the input of fibrous material and fluid is at 14, as denoted by the arrow; and 15 denotes the control air jet.
  • 11 is the extension of the main stream, that is, of the main line trunk duct 10; and 12 is a branch output duct leading to a machine, to which fibers are to be supplied.
  • the area of the duct 10-11 is calculated using known conventional methods for pneumatic conveying. However, it should be noted that when a jet is used for controlling fibrous materials, that, if the main supply stream is increased in pressure, this decreases the amount of pressure required to control the supply, and that, also, the control flow necessary to force the supply from one branch to another decreases as a percentage of the main supply flow.
  • a large increase in the angle at which the branches 11 and 12 intersect the main duct 10 will increase the flow and move the stream attachment point downstream further in the branch duct work. Also, any increase in the area of the branch apertures will increase the tendency for counterflow and also decrease the pressure recovery. If a splitter 19 or wedge is provided; and this splitter or wedge is moved away from the cusp area 18, this has the effect of increasing the counterflow which decreases the output energy and also decreases the pressure recovery of the flow. However, this adjustment also tends to decrease the tendency of the main supply flow to oscillate.
  • a vent is provided at 20 opposite the control port 16.
  • the main supply oscillates between the tip of the wedge or splitter 19 and the cusp 18. This action produces a dynamically stable output flow which will continue to flow through the main supply output 22 in the absence of a control jet.
  • the fiber control device as shown diagrammatically in FIG. 3 is bi-stable with feedback ducts 41, 42 between the output ducts 35, 36 and the interaction chamber 34. Fiber is continuously supplied, from such equipment as opening and blending machines, to the main input duct 30, and exits from either output 35 or 36.
  • control input port is shown at 31 and supplies two branches 32 and 33 which communicate with the interaction chamber 34. From the interaction chamber the flow is into the branches 35 and 36 through the cusp points 37 and 38 formed by the partition walls 39 and 40.
  • control ducts 50, 51 each of which has a pair of branches 52 and 54, 53 and 55, respectively.
  • One branch of each pair goes to a reaction chamber 56 and the other branch of each pair goes to a reaction chamber 57.
  • the fiber-fluid flow goes to the branch ducts 58 and 59, respectively, passing from the reaction chambers through the cusp points 60 and 61.
  • the fluid flows past the cusp points 62 and 63, respectively, to the branches 64 and 65 which unite in the main trunk line 66.
  • the type of device shown in FIG. 4 only gives an output at 66 when one or other of the two control signals 50, 51 is present. With no control signal present, the vents 68, 69 in the interaction chambers 56, 57, respectively, cause the main supply flow at 7'0, 71, respectively, to exit through the branch output ducts 58, 59.
  • the control signal divides and flows to both reaction chambers 56, 57. In the reaction chamber 56, the control signal switches the main fiber flow 70 to the output duct 66 where it remains as long as the control signal is present at 50.
  • the control signal does not affect the fiber flow from reaction chamber 57 because the fiber and air mixture is already issuing from the output duct 59 farthest from the control signal.
  • control signals that is, the air jets
  • the control signals divide and enter the reaction chambers 56, 57 from both sides of these chambers. Since the fiber control units are monostable, the opposed control signals cancel each other and the supply flow exits through the outputs 58 and 59. Thus, the supply of fiber from either mainline 70 or mainline 71 is not diverted when both control signals are present.
  • vent hose at the outside of the interaction chambers 56, 57 to have the two fiber supply flows through 70 and 71 diverted into the central outlet 66. This will have the effect of pneumatic blending in the conveying network.
  • a further system based upon the characteristics described above is obtained by a combination of a bistable and monostable control elements. Both units have a conchamber 82.
  • the signal is applied to the control input 84, the supply flow issues from the outlet duct 85 of interaction chamber 82.
  • 90 and 91 are ducts which supply fiber to the interaction chambers 82 and 86, respectively.
  • 92 and 93 are branch ducts connecting duct 85 with interaction chamber 86 and duct 81 with interaction chamber 86, respectively.
  • the interaction chamber 86 requires a signal from the control port 80 and a signal from the control input 88 to produce a supply flow through the output duct 89 of interaction chamber 86.
  • control signal is through duct 84, the supply flow in the unit 86 will not exit from the output duct 89. If the signal controls of interaction chamber 86 are pulsed, however, the supply flow from chamber 86 switches and exits from duct 89. 95 is the other output duct from chamber 86.
  • a vent 94 is preferably provided in the interaction chamber 86.
  • a branch duct 102 leads from the main supply line 101 to the condenser 100 at each web former. It carries fibers from the main supply line to the condenser, which forms the fibers into a mat that is fed to the feed plate of the web forming machine.
  • a fan associated with each unit generates the air supply to the control jet 128, causing the fiber flow to be diverted from its normal path into the branch duct 102 and thence to the metering area 108 and condenser 100.
  • the foraminous condensing drum 100 (FIG. 6) may be similar in construction to that shown in US. Pat. No. 2,451,915. It is rotatably mounted on a horizontal axis 103 and connected through a suction box or pipe 104 to the fan 105. Fan 105 is driven from a motor 106 through a belt 109.
  • the fibers flowing from the main duct 101 into the branch duct 102 are compacted between a rotary metering roll 107 and the inside wall 108 of the trumpet section of duct 102.
  • the metering roll is of smaller radius than the wall section 108 so that the space between the periphery of the metering roll and wall or plate 108 decreases around the metering roll so that fibers may thus be compacted.
  • the metering roll 107 rotates in the opposition direction to the condenser and is so arranged that fibers forming on the condenser surface pass between the condenser and the metering roll.
  • the metering roll 107 is driven by a variable speed DC. motor (not shown) and is mounted in bearings which define a rotational axis 112 parallel to the condenser axis 103.
  • the condenser fiber mat is fed to the feed plate of the Web forming machine.
  • the metering roll 107 is adjustable toward and from the wall 108 of the duct 102 by adjustment of the yoke or trunnion 114, on which the end bearings of the metering roll are mounted.
  • Variation in the cross-sectional area of the trumpet through this adjustment adjusts the final thickness of the mat for given roll and condenser rotational speeds.
  • the surface speed of the condenser is also variable, the condenser being driven through a belt drive 115 or a gear train from the jack shaft 116 which is driven by a belt 118 or other conventional means through a variable speed transmission 117.
  • the reservoir 102 is supplied with tufts of opened fiber in a manner which maintains the reservoir and trumpet full until the air flow through the fiber restricts the fan output.
  • the trumpet area has a concave curvature so that the cross-sectional area decreases, wall 108 approaching the metering roll downwardly.
  • Rolls 119 and 121 are auxiliary feed rolls which guide the mat from the condenser 100 to the feed plate of the web forming machine; and roll is the feed roll for feeding the mat oif feed plate 110 to the lickerin of the forming machine.
  • the pneumatic conveyor or main supply duct 101 receives the fiber and air mixture from a conventional pneumatic tufting opener 123 (FIG. 8), to which the fiber is delivered through pipe 126.
  • Each web forming machine here shown as a carding machine 125, has a branch duct 102 connected to a fiber flow control section 120.
  • the main supply duct 101 constitutes a pneumatic conveyor, which is part of the main trunk line, which connects with the various web forming machines.
  • Connected to the control section 120 are the air control ducts 122 positioned above the main supply line and supplied with air from the fans 105 and connecting ducts 124.
  • each condenser which is foraminous, has air sucked through it continuously by operation of the fans 105.
  • the fans return the air to the control jet ports 128 which are situated in the top of the interaction chambers 120.
  • the fiber in the conveying ducts enters the fiber control element through main line 101 at high velocity.
  • the control jets 128 contact the main supply flow in the interaction chambers 120.
  • the supply flow is diverted into the branch lines 102 where it is acted upon by the suction of the mat forming unit; and the fibers are condensed upon the continuously revolving condensers 100 until the trumpets 108 are full of fibers.
  • the air fiow through the suction chamber is reduced in proportion to the head of fiber in the associated chute 102.
  • the reduction in air suction causes a like decrease in air output of the associated fan 105, which in turn reduces the control jet action in the associated interaction chamber 120 so that as the mat forming unit adjusts the head of fibers in the chute 102, the control jet either decreases or increases in force, causing the main supply fiow to split at the juncture of main line 101 and a branch 102 in proportion to the action of the associated control jet.
  • a constant supply of fiber is maintained in the mat-forming air bridge associated with. each condenser.
  • the dilution factor to conveying rates for normal materials will be in the region of 28% to 35%.
  • the concentration of air to fiber delivered from the main supply duct would be 50 lbs. plus the initial overfeed of lbs., or 150 lbs. per hour.
  • the amount of air within the supply line remains substantially the same so that the concentration of air to fiber is four times greater at the last card than at the first card in the system.
  • the coacting functions of air cut-off in the air bridge reservoirs, as they fill with fiber, along with a corresponding change in effectiveness of the control jets assure, therefore, no fiber flow when the reservoirs are full, and maximum fiber flow when the reservoirs are empty.
  • the present invention uses the air, that passes through the trumpet, condenser, and fan, to supply a working force to assure removal of fiber from the main supply duct without the use of any mechanical or other appurtenances in the system. This is a most important and novel feature of this invention.
  • the fiber to air ratio would normally decrease in the supply line. Since the control jet pressure needs to be more than 10% of the supply pressure before a change in direction of supply flow is present, adjustment of the jet nozzle pressures permits increase or decrease of the effectiveness of the jet force applied to the main supply flow at the different points of withdrawal along the main trunkline.
  • a combined fiber tuft opening and tuft delivery system is combined herein with means for returning the overfeed directly to the conveying system without it passing through a second opening stage.
  • FIGS. 7 and 8 one means for supplying air and fibers to the pneumatic conveying and transfer system is shown.
  • a pneumatic conveyor 126 supplies fibrous material from a conventional bale opener or from other conventional cleaning and blending equipment to the main chute 132.
  • the fiber is allowed to fall in chute 132 under the influence of gravity and is also carried downward by the action of the endless foraminous screen 133 which travels over rollers 130, 131 and whose upper (left-hand) reach moves in a downward direction over a suction box 151.
  • the fibrous material is compacted through this action and because of the wedge-shaped reservoir formed between the wall 134 and the upper reach of the screen 133, and is fed by the feed rolls 136, 137 to a conventional high speed spiked opening drum 138 driven by any suitable means.
  • the open tufts of fiber are released from the pins or spikes of drum 138 by the action of centrifugal force and the stripping action of the high velocity air flow from a fan 139.
  • the small tufts of fiber are then blown into the main duct 101 of the pneumatic conveying system.
  • the fiber control elements 122, 128, direct the flow of material as required into the branch duct 102.
  • the surplus fibers are returned through return duct 140 to the return chute 145.
  • This return chute has a moving foraminous endless screen belt 146 in it and a sloping wall 147. Screen 146 travels over rolls 153 and 154. In a manner similar to the chute 132, therefore, the return fiber tufts are fed to a single feed roll 148 which acts with a feed plate 150 to feed the tufts to the action of the brush type roll 149. This action loosens the tufts and returns them to the main line duct 101.
  • suction boxes 151 and 152 Situated behind the foraminous screens 133 and 146 are suction boxes 151 and 152, respectively, which withdraw the air from the chutes 132 and by action of the fan 155, the output of which supplies the distribution fan 139.
  • a conventional measuring device 158 in the duct 101 adjacent the input end of this duct produces an electrical signal corresponding to the weight of fibrous material passing into this duct per unit of time.
  • This signal is passed through the amplifier 157 which in turn regulates the armature voltage of the motor 156 which drives the feed rolls so that the supply of fiber from the chute 132 is increased or decreased depending upon flow conditions. If the return supply of tufts through the chute 145 is increased with respect to the flow conditions, a corresponding decrease is made in the rate of feed by the feed rolls 136 and 137 into chute 102, and vice versa.
  • FIGS. 9 to 11 inclusive A presently preferred form of apparatus embodying features of the invention is shown in FIGS. 9 to 11 inclusive.
  • 160 denotes the section of the main line duct, to which fibers and air are supplied from pipe 161.
  • a plenum chamber 162 Disposed above section 160 is a plenum chamber 162.
  • the main line section 160 is supported from the plenum by a collar 164 and eye-bolts 166.
  • Air is supplied to the plenum from the exhaust side of the condenser of the fiber forming machine, with which the pneumatic transfer system of this invention is associated, through the pipe section 168.
  • this pipe section has an opening 170 extending in the direction of its axis.
  • a plate or damper 172 is slidably adjustable angularly on the pipe section to control the amount of this opening. The position of the damper is adjusted by means of the rod 174, which extends out through an opening in the plenum, and which is operated by the knob 176.
  • bafiies 178 there are mounted for angular adjustment a plurality of bafiies 178 (in the case shown, eight).
  • Each baffle is mounted on a shaft 180, which is journaled at opposite ends in the sidewalls of the plenum, and which is rotatably adjustable by means of a handle 182 that is secured in one outer end of the shaft.
  • the plenum is adapted to communicate with the section 184 of the main line duct through an opening 186 in the upper wall of this section.
  • the area of this opening is controlled by a sliding plate or closure 188, which is ma nipulated by a handle (not shown) that is connected to the shaft 190, which is journaled at opposite ends in the sidewalls of the plenum.
  • An arm 192 is secured to this shaft and is connected by a link 194 with an arm 196 that is fastened to or integral with the slide 188. Rotation of shaft 190 adjusts slide 188, thereby controlling the area of the opening 186.
  • the baffles insure even distribution of the fibers and air across the whole width of the slot 186 to aid in securing a uniform thickness of the mat built up by the fibers on the condenser.
  • the section 184 of the main line duct is enlarged and communicates with the next following section 198 of the main line duct and with the branch duct 200 that leads to the condenser of the machine which is to be fed.
  • a cylindrical bar 202 at the juncture of the main line section 198 and the branch duct 200 acts as a splitter.
  • the rate of flow of fibers and air to the branch duct 200 is further controlled by an adjustment of a nose piece 204 which is secured to the flexible stainless steel lower wall 206 of the section 280 of the branch duct.
  • This nosepiece 204 has an arm 208 attached to it which has a rod 210 secured to it adjacent its lower end. Screws 212 and 214, which thread through brackets 216 and 218, respectively, that are fastened to the upper frame work of the machine, and which engage at their inner ends against the rod 210 serve to adjust the position forward or back of the nosepiece 204 and thereby of the flexible wall 206.
  • the branch duct connects with the pipe 220 which leads to the trumpet section 222 (FIG. 11).
  • the trumpet section in conventional manner narrows downwardly so that its cross section is reduced downwardly. It is curved in its lower portion 224 to extend arcuately about the condenser 226, approaching the periphery of the condenser more and more as it extends down.
  • the condenser is of standard construction and comprises a foraminous drum 228 that is journaled at opposite ends in the machine to rotate about an axis 230.
  • a duct 232 is mounted within the condenser screen 228 coaxially thereof, and carries a plurality of wipers 234, which wipe the inner periphery of the screen as the screen revolves, to sweep fibers, which may gather on the inside of the screen therefrom.
  • a suction fan 240 which is connected to the ends of the duct 232 serves to draw air through the screen and cause fibers to be delivered into the trumpet sections 222 and 224 onto the screen so that they are deposited in random fashion thereon.
  • the air is drawn by the fan 240 from the condenser 226 through a slot 235 extending in the direction of axis 230.
  • the air is exhausted by the fan 240 into the duct (244, which is connected by the elbow 246 with the pipe section 168 that extends into the plenum 162.
  • the exhaust air from the condenser is delivered into the plenum 162.
  • the air flows through jet opening 186 to cause air and fibers to be deflected from the main line duct section into the by-pass duct section 200
  • the fibers deposited on the condenser screen 228 are doffed by a dofiing roll 250, and delivered by the feed roll 252 over the nose bar 254 to a conventional lickerin 256, which forms no part of the present invention.
  • branch ducts one for each machine, connecting said trunkline to the respective machines
  • each branch duct means disposed upstream of the juncture of each branch duct and said trunkline for directing a jet of air against one wall of said trunkline to divert air and fibers from said trunkline into the respective branch line,
  • trunkline having an interaction chamber of enlarged cross-sectional area upstream of each said juncture into which the jet of air flows
  • a splitter member is disposed at each said juncture
  • each splitter member being adjustable toward and away from the associated interaction chamber.
  • each branch duct conveys fibers and air to a movable foraminous condenser
  • a fan is connected to each condenser to draw air therethrough from the branch line and to cause deposit of fibers on the condenser
  • a duct connects the exhaust side of each fan with the associated jet directing means to supply air to said means for said jet.
  • each condenser is a rotary condenser
  • each branch duct has a trumpet section of progressively reduced cross-sectional area around a portion of the associated condenser into which fibers may pack, whereby as a trumpet fills with fibers the air flow through the associated fan is reduced, thereby reducing the effectiveness of the associated jet directing means, and as fiber is removed from the trumpet the air flow through the associated fan to the associated jet directing means is increased to increase the fiber flow into the corresponding branch duct.
  • means for supplying fibers to said machines comprising a trunkline for carrying fibers in suspension in air,
  • a feedback duct connecting each of the last-named lines to said interaction chamber to return some of the air and fibers flowing in the respective last-named line to said interaction chamber
  • trunkline for conveying fibers suspended in air to both said chambers
  • one of the branch lines from one chamber being connected with one of the branch lines from the other chamber to form a continuation of the trunkline
  • each control duct being split and having two air-conveying ducts leading therefrom, one to each reaction chamber to direct jets of air into said chambers, whereby by supplying air selectively to one or both said control ducts the flow of air and fibers to said branch lines can be controlled.
  • an exhaust duct connects the exhaust side of each fan with the associated plenum
  • a jet opening connects each plenum with said trunkline upstream of the juncture of each branch line with the trunkline to divert fibers and air in the trunkline.
  • means for supplying fibers to said machines comprising a trunkline for carrying fibers in suspension in air,
  • each branch duct for each machine, connecting said trunkline to the respective machines, means disposed upstream of the juncture of each branch duct and said trunkline for directing a jet of air against one wall of said trunkline to divert air and fibers from said trunkline into the respective branch line,
  • each branch duct conveying fibers and air to a movable foraminous condenser
  • a fan is connected to each condenser to draw air therethrough from the branch line and to cause deposit of fibers on the condenser
  • a duct connects the exhaust side of each fan with the 12 associated jet directing means to supply air to said means for said jet
  • each condenser is a rotary condenser
  • each branch duct has a trumpet section of progressively reduced cross-sectional area around a portion of the associated condenser into which fibers may pack, whereby as a trumpet fills with fibers the air flow through the associated fan is reduced, thereby reducing the effectiveness of the associated jet directing means, and as fiber is removed from the trumpet the air flow through the associated fan to the associated jet directing means is increased to increase the fiber flow into the corresponding branch duct,
  • said jet opening extends across the whole width of the associated plenum
  • baflles are mounted adjustably in each said plenum to direct air from said plenum across the whole width of said jet opening.
  • each said lower Wall is provided to vary the area of each branch line at its juncture with said trunkline.
  • means for supplying fibers to said machines comprising a trunkline for carrying fibers in suspension in air,
  • branch ducts one for each machine, connecting said trunkline to the respective machines
  • trunkline having an interaction chamber of enlarged cross-sectional area upstream of each said juncture
  • each condenser connected to draw air therethrough from the associated branch duct to cause deposit of fibers on the condenser
  • each branch duct having a trumpet section of progressively reduced cross-sectional area disposed around a portion of the associated condenser into which fibers may pack, whereby as a trumpet section fills with fibers the air flow through the associated fan is reduced, thereby reducing the effectiveness of the associated jet,
  • each jet port being located asymmetrically with rererence to the longitudinal center of the associated interaction chamber.
  • each splitter member is adjustable toward and away from the associated interaction chamber.
  • a fiber distribution system for conveying fibers to a machine comprising a trunkline for carrying fibers in suspension in air,
  • said chamber having a pressure jet orifice adjacent one end thereof
  • one of said discharge conduits being connected to said chute to deliver fiber-laden air thereinto
  • said chute being curved opposite said condenser to converge toward said condenser around the periphery of said condenser
  • a return duct for conducting the exhaust air from said fan back to said jet orifice, whereby when the level of fibers in said chute is below the location of the fan suction there is a high rate of flow of fibers and air from said interaction chamber to said chute, and cut-off of air flow when the level of fibers in the chute is above the location of the fan suction.
  • a fiber distribution system comprising an elongate interaction chamber
  • suction means for drawing air through said condenser to separate the air from the fibers and cause deposit of fibers 0n the condenser and for recycling the air to said chamber in the form of a jet to control the discharge conduit into which the fiber-laden air will flow from said chamber, whereby the direction and rate of flow of the fiber-laden air from said chamber is controlled by the demand of said suction means.
  • suction means for drawing air through said condenser to separate the air from the fibers and cause deposit of fibers 0n the condenser and for recycling the air to said chamber in the form of a jet to control the discharge conduit into which the fiber-laden air will flow from said chamber, whereby the direction and rate of flow of the fiber-laden air from said chamber is controlled by the demand of said suction means.

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US3567288D 1969-02-03 1969-02-03 Pneumatic fiber conveying system Expired - Lifetime US3567288A (en)

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US (1) US3567288A (de)
AT (1) AT324891B (de)
BE (1) BE744938A (de)
BR (1) BR7016535D0 (de)
CH (1) CH510750A (de)
CS (1) CS177028B2 (de)
DE (1) DE2002187C3 (de)
DK (1) DK121596B (de)
ES (1) ES374861A1 (de)
FR (1) FR2031198A5 (de)
GB (1) GB1259699A (de)
LU (1) LU60230A1 (de)
NL (1) NL7001448A (de)
NO (1) NO133077C (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744091A (en) * 1970-12-21 1973-07-10 Curlator Corp Mat forming apparatus for fiber web forming machine
US3837540A (en) * 1971-12-24 1974-09-24 Bergwerksverband Gmbh Control method and apparatus
US3873164A (en) * 1973-07-06 1975-03-25 Us Agriculture Pneumatic valve for airborne materials
US4191500A (en) * 1977-07-27 1980-03-04 Rockwell International Corporation Dense-phase feeder method
US4240180A (en) * 1979-02-07 1980-12-23 Rando Machine Corporation Fiber feeding apparatus for carding machines and the like
US4264242A (en) * 1978-08-10 1981-04-28 Nodet Gougis S.A. Method and apparatus for distributing pulverulent or particulate materials to a plurality of dispensing points, e.g. for sowing seeds or spreading fertilizer
US4462140A (en) * 1982-09-07 1984-07-31 Rando Machine Corporation Pneumatic leveling device for fiber feeding apparatus
US4770344A (en) * 1986-12-08 1988-09-13 Nordson Corporation Powder spraying system
US4970759A (en) * 1989-04-14 1990-11-20 Roberson James H Textile fiber processing apparatus and method
US5150502A (en) * 1989-04-14 1992-09-29 Roberson James H Textile fiber length sorting apparatus and method
US5224243A (en) * 1990-08-20 1993-07-06 Maschinenfabrik Rieter Ag Cleaning line with false air infeed valve for regulating air flow therein
US5934205A (en) * 1996-12-23 1999-08-10 Combustion Engineering, Inc. Y-shaped distributor with liner assembly for distribution of pulverized coal and air mixture
WO2019036523A1 (en) * 2017-08-14 2019-02-21 Montag Investments, LLC MERCHANDISE LINE SEPARATOR HAVING PNEUMATIC ASSISTANCE FOR AIR DISTRIBUTION SYSTEMS
CN113652773A (zh) * 2021-07-15 2021-11-16 杭州科杰实业有限公司 一种输出棉层稳定的气压棉箱

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH599990A5 (de) * 1975-07-16 1978-06-15 Rieter Ag Maschf
DE3442942A1 (de) * 1984-11-24 1986-05-28 Trützschler GmbH & Co KG, 4050 Mönchengladbach Vorrichtung zum pneumatischen speisen einer anzahl von karden
CN110965153A (zh) * 2019-11-29 2020-04-07 界首市佳美棉业有限公司 Pet短纤维喂入装置

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744091A (en) * 1970-12-21 1973-07-10 Curlator Corp Mat forming apparatus for fiber web forming machine
US3837540A (en) * 1971-12-24 1974-09-24 Bergwerksverband Gmbh Control method and apparatus
US3873164A (en) * 1973-07-06 1975-03-25 Us Agriculture Pneumatic valve for airborne materials
US4191500A (en) * 1977-07-27 1980-03-04 Rockwell International Corporation Dense-phase feeder method
US4264242A (en) * 1978-08-10 1981-04-28 Nodet Gougis S.A. Method and apparatus for distributing pulverulent or particulate materials to a plurality of dispensing points, e.g. for sowing seeds or spreading fertilizer
US4240180A (en) * 1979-02-07 1980-12-23 Rando Machine Corporation Fiber feeding apparatus for carding machines and the like
US4462140A (en) * 1982-09-07 1984-07-31 Rando Machine Corporation Pneumatic leveling device for fiber feeding apparatus
US4770344A (en) * 1986-12-08 1988-09-13 Nordson Corporation Powder spraying system
US4970759A (en) * 1989-04-14 1990-11-20 Roberson James H Textile fiber processing apparatus and method
US5150502A (en) * 1989-04-14 1992-09-29 Roberson James H Textile fiber length sorting apparatus and method
US5224243A (en) * 1990-08-20 1993-07-06 Maschinenfabrik Rieter Ag Cleaning line with false air infeed valve for regulating air flow therein
US5934205A (en) * 1996-12-23 1999-08-10 Combustion Engineering, Inc. Y-shaped distributor with liner assembly for distribution of pulverized coal and air mixture
WO2019036523A1 (en) * 2017-08-14 2019-02-21 Montag Investments, LLC MERCHANDISE LINE SEPARATOR HAVING PNEUMATIC ASSISTANCE FOR AIR DISTRIBUTION SYSTEMS
CN113652773A (zh) * 2021-07-15 2021-11-16 杭州科杰实业有限公司 一种输出棉层稳定的气压棉箱

Also Published As

Publication number Publication date
GB1259699A (en) 1972-01-12
BR7016535D0 (pt) 1973-01-09
DE2002187C3 (de) 1980-06-12
ES374861A1 (es) 1972-03-16
DE2002187A1 (de) 1970-08-13
LU60230A1 (de) 1970-03-26
NO133077B (de) 1975-11-24
DK121596B (da) 1971-11-01
NL7001448A (de) 1970-08-05
DE2002187B2 (de) 1979-09-13
CH510750A (de) 1971-07-31
FR2031198A5 (de) 1970-11-13
BE744938A (fr) 1970-07-01
NO133077C (de) 1976-03-03
CS177028B2 (de) 1977-07-29
AT324891B (de) 1975-09-25

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