EP3875644A1 - Höckerdüse zur herstellung von schmelzgeblasenem vliesstoff - Google Patents

Höckerdüse zur herstellung von schmelzgeblasenem vliesstoff Download PDF

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Publication number
EP3875644A1
EP3875644A1 EP21159701.8A EP21159701A EP3875644A1 EP 3875644 A1 EP3875644 A1 EP 3875644A1 EP 21159701 A EP21159701 A EP 21159701A EP 3875644 A1 EP3875644 A1 EP 3875644A1
Authority
EP
European Patent Office
Prior art keywords
die
holes
sagittal plane
ejection portion
melt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21159701.8A
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English (en)
French (fr)
Inventor
Giuseppe ANGELICO
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.)
Cat Srl
Original Assignee
Cat Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IT102020000004639A external-priority patent/IT202000004639A1/it
Application filed by Cat Srl filed Critical Cat Srl
Publication of EP3875644A1 publication Critical patent/EP3875644A1/de
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • D01D4/025—Melt-blowing or solution-blowing dies
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)

Definitions

  • This invention relates to a cusp die for producing melt-blown non-woven fabric of the type specified in the preamble of the first claim.
  • this invention relates to a die designed to produce non-woven fabric, also known by the acronym NW, from polymer filaments extruded through the die itself.
  • non-woven fabric As is known, non-woven fabric, or NW, is an industrial product similar to a fabric, but which is obtained with methods other than weaving and knitting. Thus, in a non-woven fabric, the fibres have a random development, without identifying any orderly structure, while in a fabric, the fibres have two directions, which are prevalent and orthogonal to one another, usually known as the warp and weft.
  • high-quality NWs for hygiene- and sanitary-type products are distinguished from low-quality NWs used above all for geotex.
  • non-woven fabrics can essentially be divided into spunlace, spunbond, and melt-blown.
  • Spunlace fabric undergoes processing, which gives the material equidirectional strength. Due to this property and to the possibility of its being produced in various materials, such as viscose, polyester, cotton, polyamide and microfibre, and to the possible finishes, i.e. smooth or perforated, and to the multitude of smooth or printed colours, spunlace is recommended for the hygiene and sanitary sector, for the automotive and cosmetic sectors, and for industrial or disposable uses.
  • Spunbond which is usually made with polypropylene, is a non-woven fabric, which can be used in a variety of ways in the agricultural, hygiene and sanitary, construction, furniture, mattress, and other related sectors.
  • numerous finishes can be applied to Spunbond, such as printed, laminated, printed laminated in flexography and self-adhesive.
  • melt-blown NW is made by means of specific spinnerets so as to obtain more sophisticated technical features than the previous NWs.
  • melt-blown fabric is characterised by fibres with higher filtering power, both for liquid and aeriform substances.
  • Plants for producing non-woven melt-blown fabric are conventionally made up of components, as shown in Fig. 6 .
  • known plants generally comprise a first support, a breaker plate, a cusp die, a second support, and an air blade.
  • the breaker plate is designed to channel and filter the polymer, usually polypropylene, towards the cusp die.
  • the latter is a device comprising, as mentioned above, a perforated cusp portion designed to the polypropylene to exit under pressure.
  • the first support is basically an element connecting the box and the breaker plate, while the second support is, instead, designed to support the air blade and is arranged in such a way as to close the breaker plate and the melt-blown device inside the box.
  • the air blade is composed of a casing wrapping the cusp of the melt-blown device so as to direct a flow of air, possibly non-turbulent, towards the holes of the cusp.
  • the polymer material enters the box and starts its path inside it at a temperature of approximately 240-270 °C.
  • the cusp comprises 30 to 50 holes/inch aligned along a main direction with diameters ranging from 0.15 mm to 0.4 mm and with a hole depth ranging from 10-13 times the diameter.
  • the air blade is basically made up of two converging pipes up to an expulsion space, or slot, extending between 0.7 and 2 mm in which the air flows out at about 180°.
  • the acceleration of the air inside the blade makes it possible to create a flow that, in contact with the polymer, atomises the polymer, creating sprays comprising very fine particles that, in turn, lie on movable carpets with high speed.
  • the box therefore, in addition to including the polymer inlet duct, includes air inlet ducts to feed the air blade.
  • melt-blown technology is attached to specific component configurations and a well-defined procedure.
  • the technical task underlying this invention is to devise a cusp die for producing melt-blown non-woven fabric, which is capable of substantially overcoming at least some of the above-mentioned drawbacks.
  • Another purpose of the invention is to create a cusp that makes it possible to increase the efficiency of the NW product without needing to modify the structure of the melt-blown plants as currently conceived.
  • An additional task of the invention is to obtain a cusp die compatible with current melt-blown plants.
  • the cusp die for producing melt-blown non-woven fabric according to the invention is globally denoted with the reference number 1.
  • the die 1 is basically configured to be laid inside a melt-blown non-woven fabric plant.
  • the die 1 preferably has, at least partially, a cusp or arrow shape.
  • the melt-blown plant that includes the die 1, comprises, as well as the die, basically conventional components.
  • the plant may comprise, as shown in Fig. 4 , a box, a breaker plate, one or more supports, and an air blade.
  • the box is, usually, a U-shaped containment device, inside of which the plant components are laid.
  • the box preferably includes at least one main duct.
  • the main duct is preferably designed to enable polymeric fluid to pass through the box.
  • the main duct is preferably designed to enable the passage of polymeric fluid approximately around 240°C-270°C.
  • the polymeric fluid may consist of polypropylene.
  • the breaker plate preferably includes at least one or more direction pipes.
  • the direction pipes may be of the converging type.
  • the direction pipes are preferably in fluidic through connection with the main duct and are designed, in any case, to direct the polymeric fluid or, rather, to convey the polymeric fluid along a pre-determined direction.
  • At least one filtering element is usually arranged in such a way as to filter the polymeric fluid before its expulsion from the plant.
  • the breaker plate is, thus, preferably attached to the box via a first support.
  • the first support can, therefore, include a connection arranged between the main pipe and the direction pipes upstream of the filtering element, if present.
  • the die 1 is, therefore, preferably designed to be attached downstream of the breaker plate in order to receive the polymeric fluid filtered by the breaker plate.
  • the die 1 preferably defines a sagittal plane 1a.
  • the sagittal plane 1a is basically a mid-plane designed to divide the die 1 into two adjacent portions that are basically placed side-by-side.
  • the sagittal plane 1a defines, in addition, the extension plane along which the die 1 extends.
  • the die 1 is, thus, designed to be attached to the breaker plate, inside a melt-blown plant, in such a way that the sagittal plane 1a is parallel to the direction defined by the direction pipes.
  • the die 1 when in use, is designed to be attached to the breaker plate in such a way that the sagittal plane 1a rests on the sagittal plane of the whole plant.
  • the die 1 thus, defines a first flank 10 and a second flank 11 in relation to the sagittal plane 1a.
  • the first flank 10 and the second flank 11 are mutually bounded by the sagittal plane 1a. They basically define, as shown in Figs. 1-5b , a right and left flank of the die 1 when in use inside a plant.
  • the die in addition, defines a main extension direction 1b .
  • the main extension direction 1a is a predetermined direction over the sagittal plane 1a.
  • the first flank 10 and the second flank 11 basically extend along the main extension direction 1b placed side-by-side each other in relation to the sagittal plane 1a.
  • the die 1 thus comprises an ejection portion 2.
  • the ejection portion 2 extends along the main extension direction 1b.
  • the ejection portion 2 preferably extends in such a way that it defines part of the first flank 10 and, at the same time, part of the second flank 11.
  • the ejection portion is, thus, basically divided preferably into two specular halves by the sagittal plane 1a.
  • the ejection portion 2 is, in any case, designed to convey polymeric fluid towards an air blade, when in use.
  • the air blade is, as already suggested, an element external to the die 1.
  • the air blade is a component of the melt-blown plant usually attached by means of a second support to the first support and close to the ejection portion 2 in such a way as to enable a controlled flow of air to hit the polymeric fluid as it comes out of the ejection portion 2.
  • the die In order to convey the polymeric fluid to the ejection portion 2, the die includes at least one extrusion pipe 3.
  • the extrusion pipe 3 is preferably configured to convey the polymeric fluid towards the ejection portion 2.
  • the extrusion pipe 3 preferably extends along the sagittal plane 1a.
  • it is designed, in use, to be placed in fluidic through connection with the direction pipe of the breaker plate in such a way that it receives fluid filtered by it.
  • the extrusion pipe 3 preferably extends perpendicularly to the main extension direction 1b of the die 1.
  • the die 1 could equally include a plurality of extrusion pipes 3 distributed along the main extension direction 1b, or parallel to it, each one extending perpendicularly to it and parallel to the other extrusion pipes 3.
  • the die 1 also comprises, therefore, a plurality of holes 4.
  • the holes 4 are preferably arranged in the ejection portion 2. In addition, the holes 4 are placed in fluidic through connection with the extrusion pipe 3 and communicating with the outside.
  • the holes 4 are configured to expel polymeric fluid towards the outside.
  • the holes 4 are arranged close to the air blade/s.
  • the holes 4 are preferably arranged close to the die, or can be arranged astride the cusp, or half astride the cusp and half close to the blade.
  • the holes 4 may all be in fluidic through connection with an extrusion pipe 3, or they may each be in fluidic through connection with a single extrusion pipe 3.
  • the holes 4 extend perpendicularly to the main extension direction 1b, parallel to the sagittal plane 1a.
  • the holes 4 of the die 1 are not arranged or distributed along a single row, as with the prior art dies.
  • the holes 4 of the die 1 are arranged along at least one row 4a and a second row 4b.
  • the first row 4a and the second row 4b are distinct from each other, i.e. they are not the same.
  • the rows 4a, 4b are preferably basically parallel to the main extension direction 1b. Even more specifically, at least one of them does not coincide with the main extension direction 1b or does not lie on the sagittal plane 1a.
  • first row 4a is preferably arranged at the first flank 10.
  • second row 4b is preferably arranged at the second flank 11.
  • the rows 4a, 4b are preferably arranged, as shown in Figs. 1-5b , mirroring the sagittal plan 1a.
  • holes 4 are arranged in two rows enables the creation of particular configurations.
  • the holes 4 are preferably arranged in the rows 4a, 4b alternately so that none of the holes 4 is placed side-by-side with another hole 4 along a direction perpendicular to the sagittal plane 1a. In other words, the holes 4 of one row 4a, 4b are placed next to the space separating two holes 4 in the other row 4b, 4a.
  • the holes 4 are staggered between them along the main extension direction 1b in such a way that the space separating the adjacent holes 4 of the same row 4a, 4b is smaller than the extension along the row 4a, 4b of the hole 4 of the other row 4b, 4a placed alongside the separation space.
  • the adjacent holes 4 of the same row 4a, 4b may define a separation space approximately equal to the extension along its own row 4a, 4b of the hole 4 of the other row 4b, 4a placed side-by-side with the separation space.
  • the adjacent holes 4 of one same row 4a, 4b may define a separation space less than the extension along its own row 4a, 4b of the hole 4 of the other row 4b, 4a placed alongside the separation space.
  • the separation space is, in any case, limited in order to obtain a high-quality non-woven fabric.
  • the arrangement of the holes 4 can, therefore, be defined according to various configurations.
  • the ejection portion 2 may exclusively define an edge 20.
  • the edge 20 may be a pointed portion, i.e. geometrically defining a point of singularity defining left and right derivatives, corresponding to the derivative on the first and second flank 10, 11 that do not coincide with each other.
  • the edge 20 is, in addition, preferably aligned with the main extension direction 1b and lies on the sagittal plane 1a.
  • the edge 20 extends on the sagittal plane 1a parallel to the main extension direction 1b.
  • the rows 4a, 4b are, thus, specularly placed alongside the edge 20.
  • the die 1 may define two edges 20.
  • the two edges 20 extend parallel to the main extension direction 1b and to the sagittal plane 1a.
  • the ejection portion 2 defines a flat surface 21.
  • the flat surface 21 is preferably perpendicular to the sagittal plane 1a.
  • the flat surface 21 is basically bounded by the edges 20 and extends along the main extension direction 1b.
  • At least three different hole 4 configurations can be defined.
  • the rows 4a, 4b are preferably arranged and extend on the edges 20. In this way, at least part of the holes 4 extend on the flat surface 21.
  • the rows 4a, 4b extend parallel to the edges 20 outside the flat surface 21 in such a way that none of the holes 4 extend across the flat surface 21.
  • the holes 4 could be arranged in more than two rows 4a, 4b and could be partially arranged on the edge 20 and/or on the flat surface 21 and/or outside the flat surface 21.
  • the holes 4 could also be arranged in more than two rows 4a, 4b in the embodiment wherein the ejection portion includes one edge 20.
  • the holes 4 could be distributed in such a way that they are basically tangent to the edge and could even partially overlap the other of the sides 10, 11, as shown in Fig. 7-8 .
  • the rows 4a, 4b may be simply considered as the directions passing through the centre of the holes 4 of the respective rows 4a, 4b.
  • the holes 4 may be have any shape. However, the holes 4 are preferably, basically cylindrical.
  • the holes 4 preferably define a minimum diameter of 0.05 mm.
  • the arrangement of the holes 4 in more rows 4a, 4b in particular makes it possible to distribute the holes 4 across the ejection portion 2 with a linear density greater than 50 holes/inch as assessed along the main extension direction 1b.
  • the linear density of the arrangement of the holes 4 depends on the size of the holes 4 themselves. In any case, considering the minimum dimensions of the holes 4 that may be used in a die 1, the maximum linear density that can be obtained is approximately 280 holes/inch.
  • the maximum linear density is approximately 250 holes/inch.
  • the die 1 can obtain distributions greater than 50 holes/inch, thanks to the distribution of the holes 4 along the separate rows 4a, 4b. Preferably, even distributions greater than 70 holes/inch.
  • the die 1 makes it possible to always obtain a high linear density of distribution with a consequent increase in the flow rate of the polymeric fluid ejected by the ejection portion 2.
  • This density can be achieved thanks to the arrangement of the holes 4 as conceived in the embodiments described above.
  • the densities may be increased, in line with the dimensions of the holes, including by adding more rows.
  • linear density is assessed by considering the projections of the various holes 4 on the sagittal plane 1a along the main extension direction 1b .
  • the plant that includes the die 1 may, in conclusion, also comprise a container.
  • the container is preferably designed to collect the polymer particles in such a way that the non-woven fabric is produced. It is basically a moveable piece of equipment, for example one defined by a conveyer belt in continuous movement.
  • the container is basically arranged below the die 1, when the latter is in use in a melt-blown plant, and is configured to receive polymer filaments from the holes 4.
  • the latter face the container so as to convey, by gravity and with the aid of the air coming from the air blades, the polymeric fluid to the container.
  • the container 6 preferably defines a collection direction basically parallel to the main extension direction 1b.
  • the operation of the die to produce the melt-blown non-woven fabric 1 previously described in structural terms is basically identical to that of any prior art die.
  • the melt-blown plant that includes the die 1, in any case, enables the production of a high-quality melt-blown non-woven fabric.
  • the die for producing the melt-blown non-woven fabric 1 according to the invention entails significant advantages.
  • the die 1 enables the drastic reduction in empty spaces between one fibre and another of the non-woven fabric in order to increase the barrier to water or air created by the fabric itself.
  • the die 1 therefore, makes it possible to increase the efficiency of the melt-blown plants on which it is mounted and to produce high-performance non-woven fabrics.
  • Another advantage is that it is also possible to increase the number of extrusion pipes 3 in the die 1, increasing, at the same time, the flow rate or throughput of the polymer.
  • At least part of the ejection portion 2 can include a surface chrome-plating designed to reduce the porousness of the contact surface between the polymeric fluid and the ejection portion 2, increasing, therefore, the fluidity of the fluid coming out the holes 4 and passing over part of the ejection portion 2. At least part of the ejection portion 2 between the holes 4 therefore includes, if present, the surface chrome-plating.
  • the surface chrome-plating can also be extended to the air blade or air knife to additionally increase the plant's efficiency. Therefore, at least one of either the ejection portion 2, in particular the part of said ejection portion 2 between said holes 4, and the air blade preferably comprises a surface chrome-plating designed to increase the flow of the polymeric fluid.
  • the holes 4 arranged in the rows 4a, 4b can be of different dimensions, i.e. they can each have different diameters.
  • both the diameters of the holes 4 on the same row 4a, 4b may vary, and, alternatively or in addition, the diameters of the holes 4 between the different rows 4a, 4b may also vary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Nonwoven Fabrics (AREA)
EP21159701.8A 2020-03-04 2021-02-26 Höckerdüse zur herstellung von schmelzgeblasenem vliesstoff Pending EP3875644A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000004639A IT202000004639A1 (it) 2020-03-04 2020-03-04 Filiera a cuspide per la realizzazione tessuto non tessuto di tipo melt-blown
US16/930,978 US11578429B2 (en) 2020-03-04 2020-07-16 Cusp die for producing melt-blown non-woven fabric

Publications (1)

Publication Number Publication Date
EP3875644A1 true EP3875644A1 (de) 2021-09-08

Family

ID=74672268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21159701.8A Pending EP3875644A1 (de) 2020-03-04 2021-02-26 Höckerdüse zur herstellung von schmelzgeblasenem vliesstoff

Country Status (2)

Country Link
EP (1) EP3875644A1 (de)
CN (1) CN113355752A (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173333A2 (de) * 1984-08-30 1986-03-05 Kimberly-Clark Corporation Extrudierverfahren und Extrudierdüse mit zentralem Luftstrom
DE102012210159A1 (de) * 2012-06-15 2013-12-19 Deutsche Institute für Textil-und Faserforschung Denkendorf Stiftung des öffentlichen Rechtes Verfahren zur Herstellung eines Strömungsleitkörpers einer Vorrichtung zur synthetischen Faserherstellung und Strömungsleitkörper hierfür

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173333A2 (de) * 1984-08-30 1986-03-05 Kimberly-Clark Corporation Extrudierverfahren und Extrudierdüse mit zentralem Luftstrom
DE102012210159A1 (de) * 2012-06-15 2013-12-19 Deutsche Institute für Textil-und Faserforschung Denkendorf Stiftung des öffentlichen Rechtes Verfahren zur Herstellung eines Strömungsleitkörpers einer Vorrichtung zur synthetischen Faserherstellung und Strömungsleitkörper hierfür

Also Published As

Publication number Publication date
CN113355752A (zh) 2021-09-07

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