US3773592A - Method and apparatus for forming composite sheets of reinforced,nonwoven fibrous materials - Google Patents

Method and apparatus for forming composite sheets of reinforced,nonwoven fibrous materials Download PDF

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Publication number
US3773592A
US3773592A US00170483A US3773592DA US3773592A US 3773592 A US3773592 A US 3773592A US 00170483 A US00170483 A US 00170483A US 3773592D A US3773592D A US 3773592DA US 3773592 A US3773592 A US 3773592A
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United States
Prior art keywords
inlay
powder
reinforcing
fiber fleece
reinforced
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Expired - Lifetime
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US00170483A
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English (en)
Inventor
H Nicolaus
H Pietsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VP Schickedanz AG
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Vereinigte Papierwerke Schickedanz and Co
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    • 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
    • D04H13/00—Other non-woven fabrics
    • 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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/04—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by applying or incorporating chemical or thermo-activatable bonding agents in solid or liquid form

Definitions

  • ABSTRACT A process for producing non-woven flat objects which are reinforced by means of a reinforcing inlay, in which the reinforcing inlay is electrostatically charged, then coated with a thermoplastic binder in powder form, the excess powder removed, and the inlay joined with at least one layer of a fiber fleece.
  • the electrostatic charge is preferably produced by frictional contact of the inlay with an electrically nonconductive material
  • the coating is preferably accomplished by conducting the charged inlay through a fluid bed of said powder
  • the removal of excess powder is preferably accomplished by blowing air through the coated inlay
  • the joining of the inlay with the fiber fleece is preferably accomplished by heat and pressure.
  • Unwoven flat objects of textile fibers of which the individual fibers are joined together by suitable binders, for example, thermoplastic materials
  • suitable binders for example, thermoplastic materials
  • Such flat objects can be prepared in very thin layers and with low surface weight, they have wide field of use, especially in the production of sanitary napkins and similar sanitary and hygienic products, for example, bandage inlays, hospital pads and the like.
  • By a proper choice of the raw fiber as well as the binder it has been possible to give such fleece materials great softness and a pleasant feel, properties which are also associated with high absorption power and especially fluid permeability and considerable wet strength.
  • the idea is also known of working into the fleece inlays in the form of threads, thread arrangements or the like, which may, for example, be joined with the raw fleece, but which may also be imbedded in the raw fleece in such manner that both sides of the finished product have a cloth or textile nature.
  • the reinforcing inlay itself is electrostatically charged and then charged with powder-form thermoplastic binder.
  • the charged (filled) reinforcing inlay is freed of excess powder by suitable measures, for example, by air blowing, beating, vibrating or the like, and finally joined with one or more layers of unreinforced or pre-reinforced fiber fleece by the action of heat and, optionally, pressure. It has been found that by the after-treatment of the electrostatically charged (and charged with thermoplastic powder) reinforcing inlay, by far the greater amount of the binder can be dissolved again from the reinforcing inlay.
  • the total binder content of the fleece so produced amounts, according to the intensity of the prescribed after treatment of the charged reinforcing inlay, to less than one percent by weight, but it may even be reduced to a value of 0.1 to 0.2 percent by weight.
  • any electrically nonconductive materials are suitable, in principle, such as have been used up to now for the production of such inlays.
  • natural materials with a high dielectric constant such as, for example, dry cotton, foils expanded to fibers or networkds of polypropylene, polyamide or the like.
  • the necessary electrostatic charge can be produced simply by drawing the reinforcing inlay from a suitable supply roll. The friction occurring in this way often suffices to form the necessary potential. This is especially the case when the material of the reinforcing inlay, on the one hand, and the thermoplastic binder, on the other hand, are sufficiently far apart in the electrostatic voltage series.
  • the electrostatically charged reinforcing inlay is conducted through a fluid bed of powder-form thermoplastic binder.
  • the lattice or network of reinforcing inlay is especially evenly charged with binder, which is a noticeable advantage when the excess must be loosened again by air blowing, beating, vibrating or the like.
  • the reinforcing inlay may be dusted with powder-form thermoplastic binder, by which, also, a very uniform charging can be obtained.
  • the line, so pretreated, of reinforcing inlay is conducted, together with one or more fiber fleeces, through a suitable heat-treating apparatus.
  • the heated strip-drum presses known per se, have proved especially suitable for this, since they permit a large-surface pressing of the individual layers of the fleece substance to be produced.
  • the process described brings the advantage, also, as compared with the known process, that production speed can be quite considerably increased.
  • FIGURE shows schematically the side view of the one way of carrying out this apparatus.
  • the apparatus proposed consists mainly of four apparatus units 1-4, which are arranged in succession, considered in the moving direction of the reinforcing inlay 5.
  • l in the drawing is the pull-off (unwinding) mechanism and the device for electrostatic charging
  • 2 is the charging (with binder) unit
  • 3 is the discharging unit
  • 4 the gluing unit.
  • the drawing represents the case in which a reinforcing inlay 5 of a partly expanded foil of polypropylene is to be processed.
  • the foil is drawn from a supply roll 6, which, in the example shown, takes place with the aid of the spreading rolls 7 and 7'.
  • the resulting friction suffices, as a rule, to charge the foil to the desired electrostatic potential. If, with the use of another material, this should not be the case, it is possible to conduct the foil over a rotating brush mechanism 8, and in this way produce the necessary charge.
  • some other suitable charging device may be used, for example, the spray electrodes, known per se, which are connected with a suitable band generator or other high voltage source.
  • the strip of reinforcing inlay S drawn from the supply roll 6 and possibly expanded as well as electrostatically charged, is then conducted over detour rolls 9 through the charging (with binder) unit 2, which in the example shown is a fluid bed chamber 10.
  • the chamber consists, in the known way, of a trough which is closed below by means ofa filter plate 11 and at the same time is separated by this from the air feed chamber 12.
  • the air feed chamber 12 is connected, for example, by means of a flange (collar) 13 with a blower 14, which sucks in air from outside and presses this into the fluid bed chamber.
  • powder-form thermoplastic binder is present, which forms the fluid bed 15 under the influence of the in-flowing air.
  • the powder-form binder of the fluid bed clings easily to the reinforcing inlay 5, because of the electrostatic charge, and is carried by the latter out of the chamber 10.
  • the air blower 16 has at its air exit side many nozzle-like slits 18, below which, at a short distance, the reinforcing inlay 5 is carried along.
  • guide rolls l9 and 19' are arranged, in the example shown, which may also be connected with vibrators (not shown), so that an additional beating effect is exerted on the reinforcing inlay 5.
  • the air blower 16 is connected through an air feed pipe 20 with the blower 21, which, optionally through a filter 22, sucks in the required blowing air.
  • the amount of binder blown out of the reinforcing inlay is collected in the suction filter 17 and can be fed for later use.
  • the suction filter 17 has inside it a filter inset 23 and is joined in the lower part, through a suction line 24, with a suction blower 25.
  • the strip of reinforcing inlay 5 goes into the gluing unit 4, which in the example shown is a heated band-drum press.
  • This press consists, in the known way, of the heated drum 26, which is seated to rotate in the direction of the arrow 27.
  • the greater part of the jacket surface of the heated drum 26 is covered with a strip 28 which turns with it, which is conducted with the aid of detour rolls 29 and tension roll 30.
  • the strip of reinforcing inlay 5 enters this press at 31; in the example shown, the two raw fleeces 32 and 33 run in with it.
  • the two raw fleeces are supported on the supply rolls 34 and 35 and are drawn off from there by means not shown.
  • the layered material is subjected to a gentle heat and pressure treatment and emerges from same as the finished reinforced fleece 36, and can then be wound up at 37.
  • Process for the production of non-woven flat objects which are reinforced by means of a reinforcing inlay, said method comprising the steps of electrostatically charging said reinforcing inlay, applying to said charged reinforcing inlay a thermoplastic binder in powder form, whereby to cause some of said powder to cling to said inlay, removing excess powder, and then joining said inlay with at least one layer of a fiber fleece.
  • reinforcing inlay is selected from the group consisting of a lattice of threads and an expanded foil.
  • Apparatus for the production of non-woven flat objects which are reinforced by means of a reinforcing inlay comprising means for pulling said inlay from a roll of such inlay and moving it in a predetermined path, means arranged in the path of movement of said inlay for applying to said inlay a thermoplastic resin in powder form, whereby some of said powder clings to said inlay, means for removing excess powder from said inlay, and means for joining said inlay with a fiber fleece.
  • Apparatus as defined in claim 10, including guide rolls for conducting said inlay under said air blower, and means for vibrating said guide rolls.
  • Apparatus, as defined in claim 7, wherein said means for joining said inlay with said fiber fleece comprises a heated drum and strip means for pressing said joined inlay and fiber fleece against said drum.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)
US00170483A 1970-08-14 1971-08-10 Method and apparatus for forming composite sheets of reinforced,nonwoven fibrous materials Expired - Lifetime US3773592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2040500A DE2040500C3 (de) 1970-08-14 1970-08-14 Verfahren und Vorrichtung zum Herstellen von verstärkten nichtgewebten Flächengebilden

Publications (1)

Publication Number Publication Date
US3773592A true US3773592A (en) 1973-11-20

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ID=5779797

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Application Number Title Priority Date Filing Date
US00170483A Expired - Lifetime US3773592A (en) 1970-08-14 1971-08-10 Method and apparatus for forming composite sheets of reinforced,nonwoven fibrous materials

Country Status (4)

Country Link
US (1) US3773592A (enrdf_load_stackoverflow)
CH (3) CH569579A5 (enrdf_load_stackoverflow)
DE (1) DE2040500C3 (enrdf_load_stackoverflow)
FR (1) FR2102256B1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664856A (en) * 1984-12-27 1987-05-12 Morrison-Knudsen Forest Products, Inc. Method of treating materials to improve their conductance for use in the manufacture of directionally aligned materials
US4743413A (en) * 1986-07-23 1988-05-10 Galichon Jean P Method of manufacturing thermostable pieces made from composite materials and the pieces thus obtained
US5875538A (en) * 1993-09-17 1999-03-02 Illinois Tool Works Inc. Method and apparatus for coating fasteners

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2745060C2 (de) * 1977-10-06 1985-04-11 Dynic Corp., Kyoto Verfahren und Vorrichtung zum Herstellen eines einbügelbaren Einlagestoffes
DE102014211021A1 (de) * 2014-06-10 2015-12-17 Neenah Gessner Gmbh Imprägnierte Filtermaterialien und daraus hergestellte Filterelemente

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2031720A5 (enrdf_load_stackoverflow) * 1969-02-05 1970-11-20 Verre Textile Ste

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664856A (en) * 1984-12-27 1987-05-12 Morrison-Knudsen Forest Products, Inc. Method of treating materials to improve their conductance for use in the manufacture of directionally aligned materials
US4743413A (en) * 1986-07-23 1988-05-10 Galichon Jean P Method of manufacturing thermostable pieces made from composite materials and the pieces thus obtained
US5875538A (en) * 1993-09-17 1999-03-02 Illinois Tool Works Inc. Method and apparatus for coating fasteners

Also Published As

Publication number Publication date
DE2040500C3 (de) 1974-11-21
DE2040500A1 (de) 1972-02-24
FR2102256A1 (enrdf_load_stackoverflow) 1972-04-07
DE2040500B2 (de) 1974-03-21
CH569579A5 (enrdf_load_stackoverflow) 1975-11-28
CH551520A (enrdf_load_stackoverflow) 1974-07-15
FR2102256B1 (enrdf_load_stackoverflow) 1974-03-29
CH1076571A4 (enrdf_load_stackoverflow) 1974-02-15

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