EP4008814A1 - Installation de production de tissu non-tissé - Google Patents

Installation de production de tissu non-tissé Download PDF

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Publication number
EP4008814A1
EP4008814A1 EP21212305.3A EP21212305A EP4008814A1 EP 4008814 A1 EP4008814 A1 EP 4008814A1 EP 21212305 A EP21212305 A EP 21212305A EP 4008814 A1 EP4008814 A1 EP 4008814A1
Authority
EP
European Patent Office
Prior art keywords
cooling
plant
section
chamber
cooling channel
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
EP21212305.3A
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German (de)
English (en)
Inventor
Graziano RAMINA
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.)
Ramina SRL
Original Assignee
Ramina 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
Application filed by Ramina SRL filed Critical Ramina SRL
Publication of EP4008814A1 publication Critical patent/EP4008814A1/fr
Pending legal-status Critical Current

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    • 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)
    • 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
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes

Definitions

  • the invention is therefore inserted in the industrial field of production of web-like material of nonwoven fibers, or more generally in the field of production of nonwoven fabric.
  • nonwoven fabric such as for example spunbond of polypropylene, polyester, polyethylene and/or other polymers, in particular for producing bandages, gauzes, caps, masks and other sanitary products, or for example for producing nonwoven fabric intended to be used in the agriculture field for covering ground to be cultivated.
  • plants for producing nonwoven fabric have been known for some time, which normally provide for forming a plurality of filaments of plastic material, which are stretched, laid on a conveyor belt and then pressed on each other in order to form the aforesaid nonwoven fabric webs.
  • the plants for producing nonwoven fabric generally comprise a main channel, along which different operating stations are vertically provided for producing the aforesaid filaments of plastic material.
  • a cooling station is provided (known with the term “quenching" in the technical jargon of the field), in which an air flow is forcibly introduced within the main channel, by means of at least one fan placed outside the latter.
  • the air flow introduced into the cooling station cools the filaments that have formed upon exiting the extrusion head of the extrusion station.
  • the cooling station comprises at least one chamber, in communication with the cooling channel for the filaments, fed with an air flow from a feed duct intercepted by ventilation means which force the air to pass through a heat exchanger.
  • the problem underlying the present invention is therefore that of overcoming the drawbacks manifested by the plants for producing nonwoven fabric of known type, by providing a plant for producing nonwoven fabric, which allows obtaining an improved distribution of the cooling gas in the cooling station.
  • a further object of the present invention is to provide a plant for producing nonwoven fabric which is simple and reliable in operation.
  • reference number 1 overall indicates a plant for producing nonwoven fabric, according to the present invention.
  • nonwoven fabric of different type and material, such as in particular spunbond made of plastic material, e.g. polypropylene and/or polyethylene, and in particular polyethylene terephthalate (PET in the technical jargon of the field).
  • plastic material e.g. polypropylene and/or polyethylene
  • PET polyethylene terephthalate
  • nonwoven fabric a substantially web-like material composed of a plurality of filaments compressed on each other in a substantially random manner.
  • the support structure 2 is intended to be abutted against the ground and preferably is made of metallic material, such as for example stainless steel, such as for example AISI 304 steel or AISI 431 steel.
  • the feed station 6 comprises an extruder supported by the support structure 2 and provided with an extrusion head 7 having an extrusion plate facing towards the inlet mouth 4 of the main channel 3.
  • the filaments F thus formed pass through the inlet mouth 4, entering into the main channel 3 in order to allow a processing thereof through a plurality of operating stations, which will be described in detail hereinbelow.
  • the plant 1 also comprises a cooling station 8, which is placed along the main channel 3 below the inlet mouth 4.
  • the cooling station 8 defines, in the main channel 3 itself, a section which hereinbelow will be called cooling channel 9.
  • the cooling channel 9 therefore corresponds with a longitudinal section of the main channel 3.
  • a cooling gas is susceptible of being forcibly introduced (e.g. an air flow, to which reference will be made hereinbelow) for cooling the filaments F coming from the outlet of the extrusion head 7 of the feed station 6.
  • the monomer suction station 60 is configured for expelling from the main channel 3, by means of the suction flow, the fumes produced during the extrusion of the plastic material by the extrusion head 7, through a stack (not illustrated) connected to the outside environment.
  • the abovementioned cooling station 8 comprises two first chambers 100, which are placed opposite, on opposite sides with respect to the cooling channel 9.
  • Each of the first chambers 100 is extended height-wise along the vertical axis Y for a first section 10 of the cooling channel 9.
  • each of the first chambers 100 is extended from the exterior towards the cooling channel 9 with a first section S1, from a first feed mouth 70 to a first delivery opening 11 in fluid communication with the cooling channel 9.
  • each of the first chambers 100 has substantially horizontal extension with preferably constant section S1.
  • the cooling station 8 also comprises two second chambers 120 which are placed opposite, on opposite sides with respect to the cooling channel 9.
  • each of the second chambers 120 is extended from the exterior towards the cooling channel 9 with a second section S2, from a second feed mouth 71 to a second delivery opening 13 in fluid communication with the cooling channel 9.
  • the cooling station 8 comprises an internal wall 15 which is extended along the vertical axis Y, laterally delimiting the cooling channel 9.
  • the aforesaid internal wall 15 delimits the extension of the cooling channel 9 around the vertical axis Y.
  • such internal wall 15 can comprise multiple sides (e.g. four sides that are two-by-two parallel) which define corresponding longitudinal flanks of the cooling channel 9, in particular parallel to the vertical axis Y.
  • the internal wall 15 is provided with the abovementioned first and second delivery openings 11, 13 in communication with the first and second chambers 100, 120.
  • first and the second delivery openings 11, 13 have width equal to the section of the chambers 100, 120, such that the internal wall 15 is extended only on the two sides adjacent to the opposite delivery openings 11, 13.
  • the latter is connected to the cooling channel 9 by means of a common opening 91 and houses at least one straightener panel 92 susceptible of intercepting the fluid flow directed towards the cooling channel 9 and imparting the desired direction thereto, in particular orthogonal to the axis Y of the cooling channel 9.
  • Such configuration of the cooling station with a common homogenization chamber 90 placed downstream of the two superimposed chambers 100, 120, has proven particularly recommended for homogenizing the air flow on the filaments and for preventing a stress thereof due to different distributions in the two superimposed chambers 100, 120, in the case of a direct connection of such two chambers 100, 120 with the cooling channel 9.
  • the homogenizing plates 80, 81 advantageously have U-bent edges such to be mounted spaced, one in abutment against the other.
  • an abutment element 75 is projectingly extended for stopping the first of the homogenizing plates 80, 81 of the provided succession of plates.
  • the straightener panel 92 can for example be of alveolar type made of aluminum, in which the cells have diameter from 2 to 5 mm and length from 30 to 60 mm with ratio between length and diameter of the cells always greater than 16. For example, the diameter is 3 mm and the length is 50 mm.
  • At least one first plate 8A has open surface comprised between 17 and 27% of its total surface (void with respect to solid) and at least one second plate 8B has open surface comprised between 35 and 40% of its total surface.
  • such different plates 8A, 8B are alternated with each other with an ABA scheme.
  • the air initially encounters multiple second homogenizing plates 8B with open surface comprised between 35 and 40% of its total surface and then at least one first plate 8A with open surface comprised between 17 and 27%.
  • five plates are provided for each chamber 100, 120, of which the first three are second plates 8B followed by a first plate 8A and then once again by a second plate 8B.
  • At least one common homogenizing plate 93 is preferably housed, of the above-indicated type and housed in the first and second chambers 100, 120; in particular this will preferably have grid or perforated plate form, but will be extended for the entire overall section of the two superimposed chambers 100, 120.
  • two aforesaid common homogenizing plates 93 are housed upstream of the straightener panel 92, which are advantageously one of first plate 8A type with regard to the void over solid ratio (i.e. the open surface) and the other of second plate 8B type with regard to the void over solid ratio (i.e. the open surface).
  • the succession of homogenizing plates 80/81, 93 which is defined in the advancement direction of the air flow in each chamber 100, 120 and in the adjacent common homogenization chamber 90 advantageously provides that the first and the second alternated plates 8A, 8B are alternated at least with ABAB sequence.
  • the embodiment illustrated in the enclosed figure 4 provides, for each succession, a total of seven homogenizing plates 80/81, 93 of which five 80/81 are in each chamber 100, 120 and two 93 are in the common homogenization chamber 90 hence with an overall BBBABAB sequence, considering with A the first plate 8A and with B the second plate 8B.
  • each first and second chamber 100, 120 comprises a prechamber 100', 120', placed upstream in the flow advancement sense and a treatment chamber 100", 120" placed downstream in the flow advancement sense and with the homogenizing plates 80, 81 housed at the interior.
  • Each prechamber 100', 120' receives the air directly from the feed mouths 70, 71 while the treatment chamber 100", 120" communicates directly with the common homogenization chamber 90.
  • the ratio between the first section S1 of the first chamber 100 and the second section S2 of the second chamber 120 is comprised between 3/6 and 5/6 and preferably is approximately 4/6.
  • the air flows into the two first chambers 100 and into the two second chambers 120 can be different, as better specified hereinbelow.
  • the plant 1 also comprises cooling means 14, which are in fluid connection with the first and the second chambers 100, 120 through the first and the second feed mouths 70, 71.
  • Such cooling means 14 are adapted to introduce through the first and the second delivery openings 11, 13, in the cooling channel 9, at least one cooling gas (such as air) for cooling the filaments F.
  • the cooling means 14 comprise a feed duct 16, which is extended between an inlet section 17, which is connected to a fan 20 and an outlet section 18, which is connected to the first and to the second feed mouth 70, 71 of the first and second chamber 100, 120.
  • the fan 20 is susceptible of making the cooling gas (e.g. air) flow through the heat exchanger 19 and then introduce it into the feed duct 16 in order to bring it to the first and second chambers 100, 120.
  • the cooling gas e.g. air
  • modulation means 23 placed to intercept the feed duct 16 between the inlet section 17 and the outlet section 18, in order to adjust the flow of the cooling gas.
  • the fan 20 is interposed between the heat exchanger 19 and the inlet section 17 of the feed duct 16, and is configured for suctioning (under reduced pressure) the cooling gas through the heat exchanger 19 and introducing it (under pressure) into the inlet section 17 of the feed duct 16.
  • the fan 20 is provided with a suction mouth 21 connected to the heat exchanger 19 and a delivery mouth 22 connected to the inlet section 17 of the feed duct 16.
  • the heat exchanger 19 is adapted to bring the cooling gas to a constant temperature comprised between 20°C and 30°C and in particular comprised between 22°C and 25°C.
  • the heat exchanger 19 is adapted to transfer heat to the cooling gas or to absorb heat from the latter, as a function of the temperature of the cooling gas entering the heat exchanger 19 itself (and which can vary for example according to the temperature of the outside environment).
  • the heat exchanger 19 is provided with one or more cooling systems and with one or more heating systems such that it can be arranged in order to absorb or transfer heat as a function of the initial temperature of the cooling gas and of the final temperature that one wishes to obtain.
  • the feed duct 16 is divided at its outlet section 18 into at least two separate branches 25, 26 adapted to convey separate flows of cooling gas to the first and second chambers 100, 120.
  • Such branches 25, 26 comprise a first branch 25 (upper), which is connected to the first feed mouth 70 of each first chamber 100, and a second branch 26, which is connected to the second feed mouth 71 of the second chamber 120.
  • the aforesaid modulation means 23 comprise at least two valves 27, 28 adapted to adjust the flow of the cooling gas into the two aforesaid branches 25, 26 and, therefore, into the corresponding cooling chambers 100, 120.
  • the modulation means 23 comprise a second valve 28 placed to intercept the second branch 26 of the feed duct 16 and arranged for feeding the second chamber 120 through the second feed mouth 71 with a second flow of the cooling gas.
  • valves 27, 28 of the modulation means 23 are settable and/or can be set for defining, of the corresponding branch 25, 26, a corresponding passage section susceptible of being traversed by the cooling gas, in a manner such to determine the flow of the cooling gas that traverses the corresponding branch 25, 26.
  • the valves 27, 28 allow reducing or increasing the corresponding aforesaid passage section, respectively in order to increase or reduce the corresponding flow of the cooling gas.
  • the claimed configuration of the feed duct 16 and of the modulation means 23 allows conveying corresponding flows of the cooling gas into the two cooling sections 10, 12, employing only one fan and by means of a simple sectioning of the feed duct 16, ensuring low energy consumptions and simultaneously a configuration of the plant 1 that is simple and inexpensive to attain.
  • Such different flows are therefore homogenized within the chambers 100 and 120 as defined above, in particular conveying into a common homogenization chamber 90 which reduces the gradient between the two flows in the two chambers 100, 120, determining an improved effect on the extruded filament and during cooling in the cooling channel 9.
  • the first branch 25 of the feed duct 16 is extended between a first inlet end 30, which is in fluid connection with the inlet section 17 of the feed duct 16, and a first outlet end 31, which is in fluid connection with the first feed opening 11 of the first cooling section 10 of the cooling channel 9.
  • the second branch 26 of the feed duct 16 is extended between a second inlet end 33, which is in fluid connection with the inlet section 17 of the feed duct 16, and a second outlet end 34, which is in fluid connection with the second feed opening 13 of the second cooling section 12 of the cooling channel 9.
  • the two valves 27, 28 can comprise corresponding modulatable shutters, provided with one or more shutters (e.g. in the form of orientable plates) movable in order to modify the passage section of the valve 27, 28 and hence of the corresponding branch 25, 26.
  • the shutter of each valve 27, 28 can be settable or positionable in a manual and/or motorized manner and/or in a permanent or modifiable manner.
  • the first valve 27 and the second valve 28 of the modulation means 23 are arranged in a manner such that the first flow of the cooling gas into the first branch 25 is always greater than the second flow of the cooling gas into the second branch 26.
  • the first flow is greater than the second flow at least by 10% of the value of the latter, and preferably, greater at least by 20%.
  • the first flow is greater than the second flow by a percentage comprised between about 30% and 100% of the latter.
  • the first flow is comprised between 2000 m 3 /h and 10000 m 3 /h
  • the second flow is comprised between 1000 m 3 /h and 5000 m 3 /h (e.g. as a function of the material and of the thickness of the filaments), while always maintaining the first flow greater than the second flow, and advantageously the aforesaid proportions.
  • the valves 27, 28 of the modulation means 23 and the suction means of the monomer suction station 60 are arranged in a manner such that the difference between the first flow in the first branch 25 and the second flow in the second branch 26 is greater than or equal to the suction flow suctioned by the suction means from the main channel 3 and in particular from the cooling channel 9.
  • the suction flow suctioned from the main channel 3 defines a reduced pressure within the latter at the suction means of the monomer suction station 60.
  • Such reduced pressure leads to an undesired turbulence of the air that flows within the main channel 3.
  • the air flows in the first chamber 100 and in the second chamber 120 substantially have the same pressure at the time of entering into the cooling channel 9 through the common homogenization chamber 90.
  • the pressure in the cooling channel 9 is comprised between 1000 Pa and 17000 Pa, in particular between 1200 Pa and 12000 Pa.
  • the pressure in the cooling channel 9 is determined by feedback-controlling the fan 20, by means of the use for example of one or more pressure sensors associated with the cooling channel 9 itself.
  • the temperature of the first flow is equal to the temperature of the second flow and, in particular, as indicated above comprised between 20°C and 30°C and in particular comprised between 22°C and 25°C.
  • the above-described cooling station 8 is obtained with a containment body 38 made of metallic plate, which is extended along the vertical axis Y of the main channel 3 between an upper wall 39 and a lower wall 40 which respectively delimit the top and bottom of the first and second chambers 100, 120.
  • the invention thus conceived therefore attains the pre-established objects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
EP21212305.3A 2020-12-04 2021-12-03 Installation de production de tissu non-tissé Pending EP4008814A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202000029879 2020-12-04

Publications (1)

Publication Number Publication Date
EP4008814A1 true EP4008814A1 (fr) 2022-06-08

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Family Applications (1)

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EP21212305.3A Pending EP4008814A1 (fr) 2020-12-04 2021-12-03 Installation de production de tissu non-tissé

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EP (1) EP4008814A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190360138A1 (en) * 2018-05-28 2019-11-28 Michael Nitschke Manufacture of spun-bonded nonwoven from continuous filaments
CN111172602A (zh) * 2020-02-24 2020-05-19 宏大研究院有限公司 纺粘非织造布细旦高速纺丝新型侧吹风装置
EP3690086A1 (fr) 2018-12-21 2020-08-05 Mitsui Chemicals, Inc. Appareil de filage par fusion et procédé de production d'un tissu non-tissé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190360138A1 (en) * 2018-05-28 2019-11-28 Michael Nitschke Manufacture of spun-bonded nonwoven from continuous filaments
EP3575469A1 (fr) 2018-05-28 2019-12-04 Reifenhäuser GmbH & Co. KG Maschinenfabrik Procédé et dispositif destinés à la fabrication de tissus non-tissés à partir de filaments continus
EP3690086A1 (fr) 2018-12-21 2020-08-05 Mitsui Chemicals, Inc. Appareil de filage par fusion et procédé de production d'un tissu non-tissé
CN111172602A (zh) * 2020-02-24 2020-05-19 宏大研究院有限公司 纺粘非织造布细旦高速纺丝新型侧吹风装置

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