EP0889986B1 - Procede de sechage et appareil associe dans une installation de controle et d'etirage d'articles tricotes - Google Patents

Procede de sechage et appareil associe dans une installation de controle et d'etirage d'articles tricotes Download PDF

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Publication number
EP0889986B1
EP0889986B1 EP97908488A EP97908488A EP0889986B1 EP 0889986 B1 EP0889986 B1 EP 0889986B1 EP 97908488 A EP97908488 A EP 97908488A EP 97908488 A EP97908488 A EP 97908488A EP 0889986 B1 EP0889986 B1 EP 0889986B1
Authority
EP
European Patent Office
Prior art keywords
article
chamber
drying
station
stretching
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.)
Expired - Lifetime
Application number
EP97908488A
Other languages
German (de)
English (en)
Other versions
EP0889986A1 (fr
Inventor
Benito Manini
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.)
Saldatrici Rotative Automatiche Sra Srl
Original Assignee
Saldatrici Rotative Automatiche Sra 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 Saldatrici Rotative Automatiche Sra Srl filed Critical Saldatrici Rotative Automatiche Sra Srl
Publication of EP0889986A1 publication Critical patent/EP0889986A1/fr
Application granted granted Critical
Publication of EP0889986B1 publication Critical patent/EP0889986B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C5/00—Shaping or stretching of tubular fabrics upon cores or internal frames
    • D06C5/005—Shaping or stretching of tubular fabrics upon cores or internal frames of articles, e.g. stockings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/045—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying thin, flat articles in a batch operation, e.g. leather, rugs, gels

Definitions

  • the present invention relates to a method and a plant for drying knitted articles, such as stockings, socks, tights or the like, usually following a wet-steam stretching treatment, during which the articles are placed on an expanding form.
  • a method and a device for drying knitted articles such as stockings, socks, tights or the like according to the preamble of claims 1 and 5 are known from EP-A-0 610 164.
  • GB-A-760,447 discloses a method and an apparatus for shaping hosiery, in particular socks or the like.
  • the articles to be shaped are fitted in dry condition over appropriate forms, introduced into a sealed chamber and subjected to a preheating and a steaming step under a pressure slightly over atmospheric pressure. Thereafter, a slight depression is generated in the chamber for the purpose of evacuating the steam and starting the drying process.
  • the object of the invention is to provide a method and a device which are able to reduce the duration of the processing cycle and reduce the energy consumption in such a plant.
  • the method according to the present invention envisages that the drying stage after stretching should take place in one or more drying chambers which are sealed shut with the article, still mounted on its form, inside and in which a vacuum sufficient to extract and evaporate the water absorbed by the fabric of the article is produced.
  • the temperature inside one or more of said chambers is kept at a level equal to or higher than the ambient temperature by means of the action of heating elements contained inside the chambers, depending on the lesser or greater quantity of water to be extracted from the fabric.
  • the invention envisages a plant for stretching and drying knitted articles, such as stockings, socks, tights or the like, said plant being of the type comprising a multiplicity of forms which can be moved between several operating stations, for example by means of a carousel rotor, a carousel with straight-path sections joined to one another, etc., each of these forms being designed to receive an article.
  • a loading and inspection station, a stretching station - usually of the wet-steam type -, one or more drying stations and an unloading station are provided.
  • the drying station or each drying station comprise a chamber which can be opened for arrival and departure of the form together with the article to be stretched and can be sealed shut, there also being provided an aspiration means for creating in the closed chamber a vacuum suitable for facilitating elimination of moisture from the article.
  • the chamber or each chamber is formed by two plate-shaped half-shells with a peripheral lip seal, the form passing through and stopping between the two slightly separated half-shells; the half-shells are then brought together in a sealed manner so as to form said chamber and contain a form with the tights during a drying period.
  • Each chamber comprises a suction duct with a valve which can be switched between a condition for connecting the chamber in the closed condition with an aspirator and a condition for connecting said chamber with the environment in order to break the internal vacuum and allow opening of the chamber.
  • At least one heater capable of being regulated so as to reach an adjustable working temperature may also be provided inside each chamber; the heater or heaters may be designed to irradiate the article thermally so as to faciliate extraction of the water.
  • the stretching and drying plant comprises a carousel turntable, which is of the type described in the prior patent and patent applications mentioned and whose constructional details are not illustrated herein, said turntable having uniformly distributed over its periphery eight forms 1, in particular of the folding-book type, which extend vertically. Tights to be stretched or to be dried before folding and packaging may be fitted onto these forms.
  • the forms are made to stop in eight stations which comprise: a loading and inspection station A; a stretching station B; drying stations C, D and E; and an unloading station F.
  • Loading of the tights onto the respective forms 1 is performed in station A, the forms in this station being in an extended condition with the two jambs 1A, 1B splayed and arranged edge to edge so as to allow simultaneous inspection for checking of the tights.
  • the jambs of the form may be closed up in the manner of a book or accordion against one another, in order to reduce the dimensions of the form and facilitate the subsequent stage of unloading of the tights from the form together with the parts of the tights already positioned on top of one another and ready for final folding.
  • stretching station B the tights are treated with saturated or superheated steam inside a chamber 3.
  • This chamber may be of the type with a sealed closure designed to withstand a pressure greater than atmospheric pressure, for a more effective stretching treatment using saturated steam at a temperature greater than 100°C.
  • the three following drying stations C, D and E each comprise a drying chamber 5 inside which at each step a form for drying the tights optionally fitted onto it is sealed shut; these chambers form a subject of the present invention and will be described more fully below.
  • the drying chambers are connected by means of pipes 7, a union 9 and a diverter valve 11 to an aspirator 13.
  • a vacuum is formed inside the latter in order to extract or at least facilitate extraction of water present in the fabric of the tights; at the end of the drying period, the valve 11 is switched so as to disconnect the chamber from the aspirator and connect said chamber with the external environment, thereby breaking the vacuum inside the chamber and allowing opening of the latter for replacement of the form with the next one by means of rotation of the rotating table by one step.
  • each drying chamber may also be provided with an orifice closed by a remote-controlled valve; in this case, the aspirator may be left continuously in communication with each drying chamber and, at the end of the drying period, said remote-controlled valve is opened so as to break the internal vacuum and activation of a washing air stream through each of the chambers, thereby improving removal of the moisture.
  • unloading station F the tights are unloaded from the form, manually or by means of a gripping member of a folding system (not shown).
  • the chambers 5 may be fitted internally with drying means, for example two heating plates arranged inside each chamber and arranged on opposite sides of the book-folded form, so as to radiate heat onto the fabric of the tights during the stoppage period of the latter inside the chamber.
  • drying means for example two heating plates arranged inside each chamber and arranged on opposite sides of the book-folded form, so as to radiate heat onto the fabric of the tights during the stoppage period of the latter inside the chamber.
  • Each drying chamber comprises a fixed half-chamber 15 (see also Figs. 2, 3, 4 and 5) formed by a sheet-metal half-shell with a limited concavity having an approximately rectangular and vertical extension, said concavity having arranged alongside it - upon each forward movement of the rotating carousel - a book-folded type form 1, as shown in Fig. 3.
  • Said half-chamber 15 is provided with an opening 15B (Fig. 3) to which a pipe 7 for connection to the aspirator 13 is connected.
  • Each drying chamber also comprises a second half-chamber 17, movable in the direction of the double arrow F2 in Fig. 2 so as to be moved away from and towards the fixed half-chamber 15; said second half-chamber 17 is formed by a second half-shell, having a shape similar to, but with a concavity larger than that of, the fixed half-chamber 15.
  • the concavities of the two half-shells are arranged opposite one another and the rectangular opening of each is delimited by a flat edge 15A, 17A.
  • the edge 15A of the fixed half-chamber facing the edge 17A of the movable half-chamber has fixed to it a lip of a flexible seal 18 made of rubber or other resilient material; this seal surrounds the entire opening of the two half-chambers.
  • the movable half-chamber 17 is made to slide in the direction of the double arrow F2 on straight guides 19, fixed in a manner not shown to the rotating framework of the carousel table; the displacement in the direction of F2 is obtained by means of a linear actuator 21, for example by means of a pneumatic jack.
  • the movable half-chamber 17 may be brought towards the fixed half-chamber 15, thus enclosing the form 1 during a drying period, or moved away from said half-chamber 15 when the rotating table of the carousel displaces the forms by one peripheral step, allowing the exit of a form with the tights at least partially dried and the entry of the next form with the tights to be dried.
  • a heating plate 23 with an electrical resistance is arranged inside one or each half-chamber 15 and/or 17 (Fig. 5); the resistance or each resistance may receive regulated pulses of current at least when the drying chamber is in the closed condition, so as to raise said plate to a temperature suitable for radiating heat onto the tights mounted on the form 1; the heating may also be continuously produced.
  • the arrangement of the plates 23 allows the tights to be irradiated on both sides and thus contributes towards evaporation of the moisture absorbed by the tights.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Knitting Of Fabric (AREA)
  • Pretreatment Of Seeds And Plants (AREA)

Claims (8)

  1. Procédé pour l'étirage en vapeur saturée et séchage d'un article tricoté tel que des bas, chaussettes, collants et analogues, dans lequel ledit article est placé sur une forme de séchage, soumis à un étirage en vapeur saturée et ensuite séché sur ladite forme, caractérisé par une étape de séchage sous vide, suivant ledit étirage, ledit vide extrayant l'eau du tissu dudit article.
  2. Procédé selon la revendication 1, caractérisé par les étapes suivantes :
    a) mise en place dudit article sur une forme de séchage ;
    b) déplacement de ladite forme et dudit article dans une porte d'étirage en vapeur saturée ;
    c) étirage dudit article dans ledit poste d'étirage en vapeur saturée ;
    d) déplacement de ladite forme et dudit article dudit poste d'étirage en vapeur saturée jusque dans une chambre (5) d'un poste de séchage ;
    e) production de vide dans ladite chambre pour sécher sous vide au moins partiellement ledit article ;
    f) prélèvement dudit article et de ladite forme de ladite chambre.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le chauffage dudit article pendant le séchage sous vide.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il comprend plusieurs étapes successives impliquant le stationnement de l'article dans autant de chambres (5) qu'il y a d'étapes, chambres dans lesquelles il est produit un vide et facultativement un chauffage.
  5. Installation pour l'étirage et le séchage d'articles tricotés, tels que des bas, chaussettes, collants et analogues, comprenant un transporteur ou convoyeur cyclique avec plusieurs formes (1), chacune étant conçue pour recevoir un article et chacune étant déplacée en succession à travers plusieurs postes, y compris un poste de chargement (A), un poste d'étirage en vapeur saturée (B) au moins une station de séchage (C, D, et E) et une station de déchargement (F), caractérisée en ce qu'au moins une station de séchage est disposée en aval dudit poste d'étirage et comprend une chambre (5) pouvant être ouverte pour l'arrivée et le départ de la forme conjointement avec l'article à étirer et pouvant être obturée de façon étanche et des moyens d'aspiration (13,11,9,7) pour créer dans la chambre fermée un vide apte à faciliter l'élimination de l'humidité de l'article.
  6. Installation selon la revendication 5, caractérisée en ce que la chambre ou chaque chambre est constituée de deux demi-coquilles formées à partir de plaques (15, 17), avec une lèvre d'étanchéité périphérique (18), la forme (1) traversant et s'immobilisant entre les deux demi-coquilles légèrement séparées.
  7. Installation selon la revendication 6, caractérisée en ce que la chambre (5) ou chaque chambre (5) comprend une gaine ou conduite d'aspiration (7) avec une soupape (11) qui peut être commutée de façon à faire communiquer la ou les chambres (5) dans la condition fermée avec un aspirateur (13) et de façon à raccorder la chambre ou les chambres avec l'extérieur de façon à permettre leur ouverture.
  8. Installation selon la revendication 6 ou 7, caractérisée en ce qu'elle comprend dans la chambre ou dans certaines des chambres un dispositif de chauffage (23) pouvant être régulé de façon à atteindre une température de service réglable.
EP97908488A 1996-03-19 1997-03-17 Procede de sechage et appareil associe dans une installation de controle et d'etirage d'articles tricotes Expired - Lifetime EP0889986B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT96FI000056A IT1286577B1 (it) 1996-03-19 1996-03-19 Procedimento di asciugatura e relativa attrezzatura in un impianto per il controllo e lo stiro di manufatti a maglia
ITFI960056 1996-03-19
PCT/IT1997/000059 WO1997035059A1 (fr) 1996-03-19 1997-03-17 Procede de sechage et appareil associe dans une installation de controle et d'etirage d'articles tricotes

Publications (2)

Publication Number Publication Date
EP0889986A1 EP0889986A1 (fr) 1999-01-13
EP0889986B1 true EP0889986B1 (fr) 2000-11-02

Family

ID=11351548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97908488A Expired - Lifetime EP0889986B1 (fr) 1996-03-19 1997-03-17 Procede de sechage et appareil associe dans une installation de controle et d'etirage d'articles tricotes

Country Status (5)

Country Link
EP (1) EP0889986B1 (fr)
DE (1) DE69703440T2 (fr)
ES (1) ES2153182T3 (fr)
IT (1) IT1286577B1 (fr)
WO (1) WO1997035059A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1305058B1 (it) 1998-12-18 2001-04-10 S R A Saldatrici Rotative Auto Apparecchiatura per il controllo e la stiratura a vapore di manufattia maglia
ITPI20010093A1 (it) * 2001-12-21 2003-06-21 Matec Spa Metodo e apparecchiatura perfezionata per stiro su forme di articoli di calzetteria
US6835258B2 (en) * 2002-12-27 2004-12-28 Sara Lee Corporation Automated processes for the production of garments

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB760447A (en) * 1954-06-09 1956-10-31 Heliot Maurice Ets Improvements in or relating to the shaping of articles of hosiery
JPH0651777U (ja) * 1991-12-26 1994-07-15 日空工業株式会社 真空乾燥装置
IT1264260B1 (it) * 1993-11-08 1996-09-23 Carmelo Angelo Cortese Macchina per il trattamento di calze da uomo particolarmente configuranti il tallone

Also Published As

Publication number Publication date
EP0889986A1 (fr) 1999-01-13
WO1997035059A1 (fr) 1997-09-25
ITFI960056A0 (it) 1996-03-19
ITFI960056A1 (it) 1997-09-19
DE69703440T2 (de) 2001-04-19
IT1286577B1 (it) 1998-07-15
DE69703440D1 (de) 2000-12-07
ES2153182T3 (es) 2001-02-16

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