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
  • D01G15/12—Details
  • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
  • D01G21/00—Combinations of machines, apparatus, or processes, e.g. for continuous processing
• • 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
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
  • D01G25/00—Lap-forming devices not integral with machines specified above
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
  • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)

Definitions

• Web drawing device arranged between a card device and a lapping machine
• the present invention relates to an installation for forming a sheet of fibers comprising at least one device for forming at least one web, in particular a card, and a spreader-lapper, a device for drawing the at least one web being arranged. between the device for forming at least one web, in particular the card, and the crosslapper, the drawing being carried out to control the surface mass distribution profile (g / m 2 ) or the thickness of the web coming out of the spreader-lapper.
• pinching the veil has the effect of expelling, at the pinches, the air in the veil from the card.
• this air which escapes from the veil because of the pinches, has a negative effect on the transport of the card web, for example by detaching it from its conveyor belt and / or by creating folds locally.
• the result is either a poor quality veil, or the need to provide complicated systems to evacuate the air and / or annihilate the effects of air on the transport of the card web.
• the present invention aims at overcoming the drawbacks of the prior art by proposing an installation for forming a layer of fibers, in particular nonwoven fibers, comprising a device for producing fiber fleece (s), for example a card, a crosslapper and a device for drawing the fiber web or sails arranged between the device for producing webs (s) and the crosslapper, which makes it possible to carry out a stretch, in particular variable as a function of time, in particular periodic , or at least one of the fiber webs to thereby adjust a desired profile given in advance of the web at the output of the crosslapper, in particular a well-homogeneous web, in particular having a transverse profile of thickness and / or mass.
• a device for producing fiber fleece (s) for example a card
• a crosslapper and a device for drawing the fiber web or sails arranged between the device for producing webs (s) and the crosslapper, which makes it possible to carry out a stretch, in particular variable as a function of time, in particular
• an installation for forming a fiber web, in particular a nonwoven web is as defined in claim 1, improvements being defined in the subclaims.
• the quality of the web is greatly improved.
• the stretching carried out for example by an intermediate stretching roller, the drawing tension in combination with the binder improving the adherence of the veil, while at the same time avoiding, thanks to this juncture, pinching the sail and therefore to mark in any way the nonwoven web, which contributes to obtain a better quality of the web at the output of the spreader-lapper.
• the advantage of the adhesion retaining associated with the combination stretching-loading, compared to a nip, is that the long fibers arranged generally in the direction of travel of the veil, keep a relative freedom of movement allowing a more progressive application of stretching and therefore limit the marking of the product.
• the drawing means comprises a roller, part of the outer surface of which carries the web or webs between the exit belt (s) and the entrance belt, the roller being controlled by rotational drive means so as to control its rotation speed to vary it according to the stretching that is to be imparted to the sail (s).
• the or each exit belt is inclined with respect to the entrance mat of the spreader-lapper.
• the exit end point of the or each carpet is offset in height with respect to, in particular is above, the entry end point of the entrance mat of the spreader-lapper.
• the upper web comes into contact with the outer surface of the drawing roller and moves along this outer surface to the return roller of the conveyor belt of the crosslapper.
• the drawing means are constituted by moving the exit mats at a constant or substantially constant speed while the peripheral speed of the drawing roller is controlled so that the latter drives the card web at a speed greater than that of the web at the output of the card and variable depending on the stretch that it is desired to impart to the (x) sail (s).
• the velocity of the input web of the crosslapper rotates at the same speed as the periphery of the tenter roll.
• the conveyor belt of the lapper-spreader drives the card web at a speed slightly greater than that of the drawing roller, for example greater than 1% to 10%, this stretching (difference in weight). velocities) between the drawing roller and the entry of the lapper preferably being constant, and therefore independent of the variable stretching applied between the exit of the card and the drawing roller.
• a fiber web forming apparatus comprising a forming a sail, for example a card, for the formation of at least one fiber web and a lapper-spreader supplied with the at least one web for producing a lapping by a back and forth motion of a lapper carriage in order to obtain a fiber web consisting of a stack of sections transverse to each other of the at least one web of fibers, a drawing device of the fiber web or sails being disposed between the output of the web formation device and the entry of the spreader-spreader, the stretching being preferably variable as a function of time, in particular periodically, to control the transverse profile of thickness and / or grammage of the sheet of fibers obtained at the outlet of the crosslapper, is characterized in that the 'stretching device comprises a driving element of at least one web, in particular a stretcher roller, arranged between the web-
• the sail or sails are thus more resistant to the drawing operation and the sheet at the output of the crosslapper is of better quality, in particular without pierced and / or deteriorated area and furthermore the transverse profile of thickness and / or weight of the tablecloth is closer the expected one corresponding to the variable stretching performed on the at least one veil, see it corresponds perfectly or almost perfectly.
• the advantage of the adhesion retaining associated with the combination stretching and suction / depression compared with a double nip as in the prior art, is that the long fibers generally arranged in the direction of the veil, keep a relative freedom of movement allowing a more gradual application of stretching which limits the marking of the web or sails and the web.
• the use of a drawing roller makes it possible to obtain a high degree of accuracy in the area of application of the suction to the fiber fleece (s).
• the suction device is arranged so that the thickness of the sail (s) passing over the driving surface is not less than 50% of the thickness of the web directly on the surface.
• upstream of the roll preferably not less than 75% of its / their thickness directly upstream of the driving element, preferably not less than 90%, still more preferably is substantially equal to thickness directly upstream of the drive element and even more preferably is equal to its / their thickness directly upstream of the driving element, in particular the suction device being arranged to create, for a total mass per unit area sail or sails between 20 and 100 g / m 8 , especially between 30 and 80 g / m 2 , a vacuum between 10 millibars and 100 millibars, especially between 40 and 70 millibars.
• the drawing roller is positioned downstream of a return roller of the or each exit belt to limit the distance over which the drawing force is applied between the respective belt return roller and the draw roller.
• two exit mats of the sail formation device in particular card, respectively upper and lower, and two upper and lower sails joining at the entrance of the driving element.
• the peripheral linear speed (Tangential) of the driving element varies in a speed range between 100 and 150% of the speed of the output web or mats of the haze forming device, especially card, preferably between 100 and 140%.
• the velocity of the lapper-spreader entrance mat is substantially equal to or equal to the peripheral velocity of the driving member.
• the carpet of the spreader-lapper drives the card web at a speed slightly greater than that of the driving element, for example greater than 1 to 10%, the drawing being preferably constant and therefore independent of the variable stretching applied by the driving element.
• the drawing roller is arranged at a distance from the return roller of the or each belt, preferably at most 1 meter from the roller or from each return roller, and in particular at a distance of between 50 mm and 300 mm.
• the gap between the return roller of the exit belt or of the upper exit belt of the sail-forming device and the drawing roller is between 5 and 20 mm, preferably between 7 and 15 mm, for a mass sail area of between 10 and 50 g / m 2 , preferably between 20 and 40 g / m 2 .
• the gap between the return roller of the second belt, or lower carpet, of output and the driving element is between 10 and 30 mm, preferably between 15 and 25 mm, for a sail area weight. between 10 and 50 g / m 2 , preferably between 20 and 40 g / m 2 .
• the present invention also relates to a process for obtaining a fiber web from an installation comprising a sail-forming device and a crosslapper, in which:
• At least one fiber web is conveyed between the exit of the webbing device and the crosslapper by passing it over a driving surface, in particular the surface of a roll,
• the at least one web is held on the suction drive surface
• the veil held on the surface is stretched.
• Figure 1 is a diagram of an installation according to one embodiment of the invention.
• FIG. 1 schematically shows an installation according to another embodiment of the invention
• the input carpet 7 '' advances at a speed substantially equal to that of the draw roller 10 ''.
• the web 50 comes into contact with the bottom surface of the endless belt 110 and moves along this surface towards the carpet 70 of entry of the spreader-lapper.
• the gap between the endless belt 110 and the belt 100 or the roller 30 is greater than the thickness of the web 50, so that no pinching force is exerted on the web 50 at this gap.
• this gap may be between 5 and 20 mm, for example between 7 and 15 mm for a soft surface density between 10 and 50 g / m z, preferably between 20 and 40 g / m 2.
• the gap between the endless belt 110 and the belt 70 or the roller 80 is greater than the thickness of the web 90, so that no pinching force is exerted on the web 90 at this gap.
• FIG. 3 shows the curve giving the variation of the speed of the roll 10, respectively 10 ', 10'', respectively of the endless belt 110, with respect to the speed of the conveyor belts 1 and 2, respectively of the carpet 1 ', 1'', 100 in terms of percentage, the minimum speed corresponding to 100% of the speed of the mats 1 and 2, respectively of the carpet 1', 1 ", 100 and the maximum speed corresponding to a value of preference between 140% and 160% of the speed of the belts 1 and 2, respectively of the belt 1 ', 1 ", 100 as a function of the transverse position expected in the final ply of the stretch stretched at a time t, the variation of the speed being cyclic period corresponding to a transition from one edge to another (a go or a return) of the lapper-lapper lapper carriage.
• This periodic profile (a single period is shown in Figure 3) speed allows to obtain a sheet having a transverse profile of uniform or substantially uniform thickness, that is to say a profile whose relative variation from one edge to the other of the thickness is

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

Priority Applications (1)

Applications Claiming Priority (3)

Related Child Applications (2)

Publications (3)

Family

ID=57861176

Family Applications (2)

Family Applications After (1)

Country Status (7)

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Family Cites Families (24)

• 2016
  • 2016-11-25 FR FR1670710A patent/FR3059344B1/fr active Active
• 2017
  • 2017-10-31 FR FR1771155A patent/FR3059343B1/fr active Active
  • 2017-11-14 WO PCT/EP2017/079227 patent/WO2018095766A2/fr not_active Ceased
  • 2017-11-14 CN CN201780072811.4A patent/CN109996910B/zh active Active
  • 2017-11-14 US US16/348,228 patent/US11885046B2/en active Active
  • 2017-11-14 EP EP17804493.9A patent/EP3545122B1/de active Active
  • 2017-11-14 ES ES17804493T patent/ES2983803T3/es active Active
  • 2017-11-14 CA CA3043266A patent/CA3043266A1/fr active Pending
  • 2017-11-14 EP EP24161459.3A patent/EP4357497A3/de active Pending
• 2023
  • 2023-12-06 US US18/530,846 patent/US20240117532A1/en active Pending

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