EP0111132A2 - Verfahren und Gerät für die Herstellung von Kunstleder oder Lederfutter und Leder oder Lederfutter auf diese Weise erhalten - Google Patents

Verfahren und Gerät für die Herstellung von Kunstleder oder Lederfutter und Leder oder Lederfutter auf diese Weise erhalten Download PDF

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Publication number
EP0111132A2
EP0111132A2 EP83110728A EP83110728A EP0111132A2 EP 0111132 A2 EP0111132 A2 EP 0111132A2 EP 83110728 A EP83110728 A EP 83110728A EP 83110728 A EP83110728 A EP 83110728A EP 0111132 A2 EP0111132 A2 EP 0111132A2
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EP
European Patent Office
Prior art keywords
hide
backing
polymer
artificial
textile
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.)
Withdrawn
Application number
EP83110728A
Other languages
English (en)
French (fr)
Other versions
EP0111132A3 (de
Inventor
Vincenzo Bonazzi
Giorgio Casiraghi
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.)
Arteca SpA
Original Assignee
Arteca SpA
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Filing date
Publication date
Application filed by Arteca SpA filed Critical Arteca SpA
Publication of EP0111132A2 publication Critical patent/EP0111132A2/de
Publication of EP0111132A3 publication Critical patent/EP0111132A3/de
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique

Definitions

  • the present invention relates to a method and an apparatus for preparing an artificial hide or hide backing and the hide or hide backing thus obtained.
  • many artificial hides or imitation- hides generally comprise a synthetic resin (plastics) skin or film having a surface (front side) imitating the grain of a real skin, and a textile base (a warp-and-weft woven fabric, a knitted fabric, or a non-woven fabric) which is stably applied to the skin reverse side.
  • synthetic resin plastics
  • textile base a warp-and-weft woven fabric, a knitted fabric, or a non-woven fabric
  • a method used for applying the base to the skin is the so-called transfer process carried out by means of a continuous web of release paper.
  • a release paper web is coated with a synthetic resin designed to form the skin later on.
  • the resin undergoes polymerization.
  • the paper web is then removed for being re-used a few times.
  • An improved artificial hide is produced with a coagulation process developed by recent techniques.
  • the textile base of the artificial hide is impregnated with a solution of polyurethane in dimethylformamide (DMF) in concentrationaranging from 10% to 15%.
  • DMF dimethylformamide
  • the solvent is then fully removed by using water and by taking advantage of the high solubility of DMF in water.
  • a polyurethane foam- impregnated textile base is obtained which gives the finished product a "feel" which is much closer to that of a natural hide, with a good clean cut, and an acceptable back al though not quite satisfactory for many applications.
  • the coagulation process requires owing to cost considerations, that the DMF be completely recovered by means of a specifically provided filtration, distillation and purification system, which involves investments of the same order of magnitude as those required by the production planto
  • Another object of the present invention is to provide a system for the production of synthetic hide or hide backing which is relatively simple and easy to monitor, makes it possible to attain a high production rate, and may be fully automated.
  • a further object of the present invention is to provide a system which has a reduced number of processing stations, is capable of operating on a continuous basis, and has relatively low maintenance requirements, whereby it can be produced and run at relatively low costs.
  • a method for preparing an artificial hide or hide backing comprises the steps of applying a solvent-free liquid pre-polymer chosen between pre-polymers of polyurethane, polyether and polyester onto a textile base or weave, treating the base thus coated with water or steam at a temperature in the 25°C to 100°C range to cause foaming and cross linking of the pre-polymer, and drying the thus treated base.
  • an apparatus for implementing the above method which apparatus comprises a liquid pre-polymer applicator unit for applying the pre-polymer on a textile base or weave, a processing chamber or tank provided with guiding cylinders adapted to define a path through which the base is exposed to hot steam or water, and a drier unit for drying the treated product coming from the processing chamber or tank.
  • a backing for artificial hides which comprises a weave or base in the form of a fabric, and is characterized in that the said weave is impregnated with a polymer or foam obtained from a liquid state polyurethane, polyester or polyether polymer precursor containing an active cross-linking site.
  • a textile weave which may be, for example, a warp-and-weft weaved fabric, a knitted fabric, a non-woven fabric, either of the elastic variety or otherwise.
  • a high quality final product such as when dealing with a napped backing it is advantageous to subject the fabric first to brushing so as to remove any lint and processing residues.
  • a liquid state resin is applied to the fabric, e.g. a pre-polymer of polyurethane, which includes a compound comprising active isocyanic groups which may be either aromatic or aliphatic in nature.
  • a polyether or poly- ester pre-polymer can also be used.
  • a suitable polyurethane pre-polymer of the type useful in the present invention is one available commercially under the tradename A.E.G.E. 100SL, a product from Tojo Polymer-Osaka, Japan.
  • the application of that pre-polymer on the supporting base weave may be effected in several ways, such as by spreading with a doctoring blade, by impregnation with an impregnating foulard, by spraying air or a pressurized liquid, by reverse roll or rotogravure printing, or by silk-screening printing.
  • agents such as suitable dyes, softeners, plasticizers, mineral fillers, bubble and foam preventing agents, to control stability over time of the final product, and the like may be added to the pre-polymer.
  • the textile weave with the pre-polymer applied thereto is then transferred to a damp environment (either a tank or chamber containing saturated steam) at temperatures in the 25°C to 100°C range.
  • the pre-polymeric material upon entering the damp environment, undergoes cross-linking and foaming and is transformed into a microporous foam.
  • the foam structure may be controlled, and hence determined, by acting on the reaction ambient conditions, that is on the temperature of the water or steam, and on the time of exposure. Control of the foam bubble size is a determining factor in establishing the extent of the finished material porosity. At high ambient temperatures and short processing times, large bubbles tend to be formed in the foam, whereas at low processing temperatures and long exposure times a fine cell formation is achieved.
  • foamed backing thus produced by subjecting it to a fluffing operation, e.g. by means of conventional equipment.
  • the foamed product is dried by causing it to first pass through a squeezer unit and then through a drier in which removal of the water contained in the foam takes place.
  • the drier may be, for example, either of the flap or chain type(rameuse)
  • compositions applied to a textile base prior to foaming and cross-linking The compositions have been applied to textile base and treated for foaming and cross-linking as set forth above.
  • a polyurethane pre-polymer additivated with 27% by weight of a mineral charge comprising calcium carbonate was used, to which was added 7% by weight of an iron oxide-based mineral pigment for dyeing the final product, as well as 1% by weight of a silicone-based bubble preventing agent (e.g. of the type of Nopco NXZ, a produce of NYMCO S.p.A. of Milan, Italy).
  • a silicone-based bubble preventing agent e.g. of the type of Nopco NXZ, a produce of NYMCO S.p.A. of Milan, Italy.
  • a knitted cotton fabric raised on both sides was used as a base.
  • the bath coagulation temperature was 50°C.
  • the pre-polymer was applied to the base by reverse roll printing.
  • a backing for artificial hides was obtained which had a medium "feel", a microporosity which depends on the coagulating or foaming conditions, medium foam resiliency, and medium abrasion resistance, dry sensation.
  • a polyether-polyester polyurethane pre-polymer additivated with 9% by weignt of a dyeing pigment and 1% by weight of bubble preventing agent were used.
  • the base was a non-woven textile napped on both sides.
  • the bath coagulation temperature was 60°C.
  • the pre-polymer was applied to the textile by means of a doctoring blade.
  • a material was obtained which had a softer feel than that of Example 1 above, a more plastic feel owing to the absence of the mineral charge, a high resiliency accompanied by a good abrasion resistance and a porosity which depends on the coagulation conditions.
  • a material was obtained which was stiffer than that of the composition in Example 2, having an even drier feel, reduced resiliency, and only fair abrasion resistance.
  • liquid polyether-polyester polyurethane pre-polymer 93% by weight of a liquid polyether-polyester polyurethane pre-polymer, 2% by weight of organic dyes, 4% by weight of a charge comprising calcium lactate, and 1% by weight of bubble-preventing agents were used.
  • the base used was a knitted fabric.
  • a pre-treatment with saturated steam at 100°C was carried out.
  • the resin was applied by immersion in water at 50°C by a reverse roll technique.
  • the coagulation step gave a highly resilient product which was abrasion-resisting and had a bright glossy colour.
  • the cell structure was much more uniform than with the other compositions described above.
  • the product is ideal for use as an imitation hide backing, to which it imparts consistency and highly valuable aesthetic properties as it takes up colour well and forms a back or reverse side which quite closely resembles that of real hide.
  • the resulting product can also form in itself an imitation hide, e.g. a napped one (felt), whether it be treated on one side or both sides, and where two supports identical to one another are laminated, such as by means of a suitable cement.
  • a suitable apparatus for implementing the above- described method, and capable of producing a backing for imitation hide having the above-discussed features is illustrated diagrammatically in the accompanying drawing.
  • the drawing actually shows a complete system for the production of a backing material for imitation hide, starting from a roll of a suitable fabric.
  • the system shown in the drawing is an apparatus for the production on a continuous basis of a backing for imitation hide. It essentially comprises two stations, one for the preparation of the textile material and the application of the liquid resin to it, and the other comprising a processing chamber or tank adapted to cause coagulation or foaming of the resin. These two stations are advantageously followed by a drier assembly for removing processing water from the product.
  • the first station includes a textile material roll 50, whence a suitably selected fabric 51 which may be of various types as mentioned above,is unwound.
  • the fabric 51 is supplied to a brushing unit, generally indicated at 52, for removing processing residues or any lint therefrom which are first raised by specially provided brushes 53 and then drawn up into a hood 54. From the brushing unit 52, the fabric is passed to a station 55, where the liquid polyurethane pre-polymer is applied on the fabric.
  • an application station Shown schematically in the drawing is an application station by impregnation, but it should be appreciated that the application may be effected with any other suitable method, such as by spreading with a doctoring blade, spraying on with either air or a pressurized liquid, roll impression, silk-screening, and the like.
  • the web 51 After undergoing impregnation at the station 55, the web 51 is fed to a processing tank 56.
  • the tank 56 is provided with a plurality of rollers 57 which delimit a constrained path for the resin-charged web 51. During the initial portion of said path, arrangements may be made for the guiding rollers 57 not to contact the treated side or the side whose appearance has little or no importance for the final product.
  • the tank 56 may be filled with water, or alternatively, form an evaporator chamber in which it is preferred to work with saturated steam rather than by immersion.
  • the treated product is supplied to a drying station which comprises a guided flap chamber 59 advantageously followed by a drier, such as a tenter (rameuse) 60 when a high production rate is aimed at with a product of some weight, in order to provide a gentle and slow drying process.
  • a drier such as a tenter (rameuse) 60 when a high production rate is aimed at with a product of some weight, in order to provide a gentle and slow drying process.
  • the treated backing picked up from the output end of the drier 60 is then wound around a roller 61.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Treatment Of Fiber Materials (AREA)
EP83110728A 1982-11-02 1983-10-27 Verfahren und Gerät für die Herstellung von Kunstleder oder Lederfutter und Leder oder Lederfutter auf diese Weise erhalten Withdrawn EP0111132A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT84967/82A IT1159538B (it) 1982-11-02 1982-11-02 Procedimento ed apparecchiatura per la produzione di un supporto per pelli artificiali e supporto cosi' ottenuto
IT8496782 1982-11-02

Publications (2)

Publication Number Publication Date
EP0111132A2 true EP0111132A2 (de) 1984-06-20
EP0111132A3 EP0111132A3 (de) 1984-07-25

Family

ID=11326608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110728A Withdrawn EP0111132A3 (de) 1982-11-02 1983-10-27 Verfahren und Gerät für die Herstellung von Kunstleder oder Lederfutter und Leder oder Lederfutter auf diese Weise erhalten

Country Status (2)

Country Link
EP (1) EP0111132A3 (de)
IT (1) IT1159538B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100352466B1 (ko) * 2000-06-03 2002-09-11 주식회사 코켐 스팀공정을 포함한 수분산폴리우레탄을 이용한 인조피혁의제조방법
WO2003004760A1 (en) * 2001-07-06 2003-01-16 C & Et Co.,Ltd Method for manufacturing artificial leather

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2236053A1 (de) * 1973-07-04 1975-01-31 Nippon Cloth Industry Co Ltd
DE2446214A1 (de) * 1974-09-27 1976-04-08 Elastogran Gmbh Verfahren zur kontinuierlichen beschichtung bahnfoermiger traeger

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2236053A1 (de) * 1973-07-04 1975-01-31 Nippon Cloth Industry Co Ltd
DE2446214A1 (de) * 1974-09-27 1976-04-08 Elastogran Gmbh Verfahren zur kontinuierlichen beschichtung bahnfoermiger traeger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100352466B1 (ko) * 2000-06-03 2002-09-11 주식회사 코켐 스팀공정을 포함한 수분산폴리우레탄을 이용한 인조피혁의제조방법
WO2003004760A1 (en) * 2001-07-06 2003-01-16 C & Et Co.,Ltd Method for manufacturing artificial leather
KR100448698B1 (ko) * 2001-07-06 2004-09-16 씨엔이티 주식회사 인조피혁의 제조방법

Also Published As

Publication number Publication date
IT1159538B (it) 1987-02-25
IT8284967A0 (it) 1982-11-02
EP0111132A3 (de) 1984-07-25

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Inventor name: BONAZZI, VINCENZO