Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/02—Pile fabrics or articles having similar surface features
  • D04B1/025—Pile fabrics or articles having similar surface features incorporating loose fibres, e.g. high-pile fabrics or artificial fur
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B9/00—Circular knitting machines with independently-movable needles
  • D04B9/14—Circular knitting machines with independently-movable needles with provision for incorporating loose fibres, e.g. in high-pile 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
  • D04H11/00—Non-woven pile fabrics
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2501/00—Wearing apparel
  • D10B2501/04—Outerwear; Protective garments
  • D10B2501/044—Fur garments; Garments of fur substitutes

Definitions

• the invention relates to an artificial fur as set forth in the preamble of the appended claim 1.
• the invention also relates to a method for the manufacture of an artificial fur. The following is a description on the use of the artificial fur and its known manufacture and structure.
• Artificial fur is a knitted pile fabric. It is a soft, bulky, light-weight and heat-insulating product. Conventional uses of synthetic fur (high-pile or sliver pile) are the linings of outdoor clothing and shoes. Technical applications include upholstery materials for furniture, technical products used in hospitals, polishing wheels and paint rollers.
• By increasing the basis weight of knitted pile fabric it can be used to manufacture either suede fur coats, in which the pile is directed to the inside, or artificial fur coats, in which the pile is directed to the outside. Because the outer surface of suede fur coats is a plain knit, it can be dyed to various patterns.
• the mechanical bonds of the fibre materials in the artificial fur are prepared directly with a knitting machine.
• the artificial fur is manufactured with a single-cylinder circular knitting machine.
• the yarns of the base knit are fed to the latch needles of the cylinder, to which is also supplied the sliver consisting of staple fibres.
• the staple fibres adhere to a doffer roll which combs the fibres to the correct direction and delivers them to the needles of the knitting machine which have been lifted to receive the fibres from the roll.
• air is blown through a narrow slot to the feeding point towards the centre of the cylinder of the circular knitting machine.
• the loop yarn which forms the actual knitted fabric is fed to the needles.
• the loop yarn binds the tufts of staple fibres with the plain knit in such a way that they form a fur-like cover.
• the step of knitting to accomplish the bond of the artificial fur is described in European patent 0 091 025 and international publication WO 95/25191.
• patent publication DD 122 558 discloses a method for manufacturing a textile structure resembling a fur, in which the textile-technical bond between the fibre material which constitutes the pile and the base knitted fabric is accomplished with a sewing knit technique (German Nahwirktechnik, Nahwirke ) which is a technique differing from the methods of manufacturing of artificial furs effected in knitting machines.
• the pile is produced by means of sewing yarns punched with needles through the base material and forming, on the other side of the base material, protruding loops which can be opened by cutting.
• a second textile layer is attached, for example by means of a heated film, to the yarn on the reverse side of the base material constituting of woven fabric, after which the fabric can be pulled off in the direction of the pile fibres, whereafter the pile fibres formed of the above-mentioned sewing yarns remain attached to the film on the outer surface of the product.
• Pile textile products manufactured by the above-mentioned sewing technique are also described in application publication DE 1 938 970.
• a second non-woven fabric or film of a thermoplastic material is placed on top of the base material, and yarns are punched through the resulting layered structure.
• the thermoplastic material which is present as an auxiliary layer therein is made to melt and bind the pile consisting of the sewing yarns better to the base material.
• a fluid dispersion adhesive is generally used, consisting of a continuous water phase and a dispersed polymer phase which can be solid or liquid. When applied, the adhesive will partly penetrate into the structure as well.
• the pile of artificial fur is glued with a latex, in which polyvinyl acetate (PVA) is dispersed as a binder in the water phase.
• PVA polyvinyl acetate
• Other binders include e.g.
• the adhesive can also be a paste, wherein a large quantity of powder-like ethyl-vinyl acetate copolymer (EVA), poly- ethylene (PE) or copolyamide (coPA) is mixed in the water phase.
• EVA powder-like ethyl-vinyl acetate copolymer
• PE poly- ethylene
• coPA copolyamide
• bicomponent adhesives such as urethane adhesives whose components are isocyanate and polyol. Also these adhesives are well- flowing, liquid, and they penetrate into the structure.
• a stabilized latex or paste is applied onto the flat side of the artificial fur for example by applying foamed adhesive with a wiping blade.
• the penetration of the adhesive in the fabric structure is controlled with surface-active agents.
• the artificial fur is guided to a frame in which the adhesive layer is thermally fixed.
• the flat surface of the glued artificial fur feels hard, which is due to the stiffness of the fixed polyvinyl acetate layer.
• US patent 4,236,286 presents the binding of pile to a knitted fabric by means of a thermally hardenable coating.
• a suede fur coat is made of a pile fabric, its glued flat surface can be dyed.
• the dye is applied onto the flat side of the artificial fur, after which the binder is thermally fixed in a frame.
• Pigment colours with the associated binders make the feel of the product hard.
• the glueing step requires separate devices for the processing of fluid dispersion adhesives, such as devices for preparing the adhesive for dispensing and devices for dispensing the adhesive.
• the adhesive has a harmful effect on the structure of the artificial fur, for example the feel is impaired. It is an aim of the present invention to present an improvement to the above drawbacks and to present an artificial fur which has a better structure and is suitable for various uses as well as or better than structures of prior art and which is also easier to manufacture.
• the artificial fur is primarily characterized in what will be presented in the characterizing part of the appended claim 1.
• Fig. 1 shows, in a flow chart, a method for manufacturing a pile structure according to the invention
• Fig. 2 shows one step of the manufacture of a pile structure in a schematic view
• Fig. 3 shows a base knitted fabric in a planar view and a finished artificial fur in a cross-sectional view
• Fig. 4 shows a detail in an artificial fur structure
• Figs. 5 to 10 show results of tests on the invention.
• the process according to the flow chart of Fig. 1 comprises the follow- ing steps: A) the feeding of a yarn of the base knitted fabric and the feeding of staple fibres forming the pile, B) the formation of the pile by fixing the staple fibres mechanically to the base knitted fabric in connection with its formation, C) the shearing of the outer surface of the pile permanently to the length and possible mechanical treatment of the pile, D) thermal treatment to fix the pile to the base knitted fabric, and E) further processing.
• Figure 2 shows an example of the manufacture of the artificial fur.
• the base knitted fabric is made by feeding yarns 1a of the base knit to knitting machine latch needles 4, to which are also fed staple fibres 3 from a doffer roll 5, to form the pile.
• This stage of operation has been described in more detail above under the heading "Manufacture of artificial fur", and the relating technique is described in European patent 0 091 025 and in publication WO 95/25191.
• Fibre material staple fibre or filament. Fibre material is also considered to include microfibres which have become common in the textile industry. According to a definition established in Europe, microfibres are fibres of less than 1 denier, but elsewhere, the upper limit is considered to be 0.7 denier.
• Staple fibre fibre material (staple) consisting of several discontinuous fibres with a defined, limited length or length distribution, also including fibres with the thickness of the microfibre class.
• Filament continuous fibre as opposed to staple fibre, also including fibres with the thickness of the microfibre class.
• Yarn yarn formed of staple fibres or one or several filaments.
• Figure 3 shows the structure of artificial fur.
• a base knitted fabric 1 is shown on the back side, and on the right hand side, the artificial fur is shown, in a cross-section taken in the direction of the base knit wales perpendicularly to the plane of the artificial fur.
• the cohesive structure of the pile of the artificial fur is the base knitted fabric 1 which consists of lengths of a yarn 1a fed to the needles of a knitting machine.
• the yarn lengths form successive courses of a plain knit.
• Staple fibres 3 protrude from the level of the base knitted fabric, which originate from tufts of fibres fed in the above- described manner to hooks of the needles of the knitting machine and whose free ends are oriented to the front side of the base knitted fabric 1 , forming a more or less dense pile depending on the density of feeding of the staple fibres 3.
• the fibre tufts are fixed to the base knitted fabric in the form of bends running together with the loops, always tied by the next loop in the order of formation of the loops, and their both ends always stick out through the previous loop on the back side of the knitted fabric.
• the original length of the pile i.e.
• the greatest possible distance of the front surface of the artificial fur from the base knitted fabric 1 naturally depends on the length of the staple fibres 3.
• the pile is sheared to the length normally by cutting the ends of the staple fibres, wherein a relatively even outer pile surface 3a is obtained, as shown in Fig. 3.
• the staple fibres can still be oriented to a desired direction, for example more upright.
• mechanical processing of the pile which can be effected to achieve a desired structure or appearance for the pile.
• Fig. 3 shows, indicated with a broken line, an additional layer 2 which is possibly fixed on the other side of the base knitted fabric 1 , i.e. the reverse side of the artificial fur, the possibilities for forming the additional layer 2 being discussed below.
• the pile formed of staple fibres 3 is fixed permanently to the base knitted fabric 1 by means of a plastic material which can be melted or softened by the effect of heat; that is, the structure of Fig. 3 contains plastic material which, after thermal treatment, has been melted or softened to such an extent in a location where the staple fibre 3 is in contact with the base knitted fabric 1 that the staple fibre has adhered to the yarn 1a of the base knitted fabric 1 by means of the plastic material which has melted/softened and solidified again after the temperature has sunk.
• Figure 4 shows a cross-section of the artificial fur along the line IV — IV of Fig. 3, i.e.
• the material area B can consist of plastic material in the staple fibres 3, plastic material in the yarn 1 b of the base knitted fabric 1 , or amalgamated plastic material in both.
• the material area can originate from the surface material of an additional layer 2 which is against the yarn 1a of the base knitted fabric and the staple fibres 3 at their point of contact,
• the meltable plastic material can be a binding fibre or a part of a binding fibre, or thermoplastics used as general structural elements for textile products, which can be in fibre form or be structures with a wider area, such as films.
• thermally bondable plastic material When a thermally bondable plastic material is selected for a product, the maximum temperatures prevailing in the conditions of its use and maintenance must be taken into account.
• the basic polymers for thermally bondable fibres are polyesters and polyamides. The softening and melting points of some polymers are given below:
• T m 245— 260°C
• suitable binding fibres are polyvinyl chloride and polyolefins (polypropylene and polyethylene), including copolymers based on them.
• polyolefins polypropylene and polyethylene
• the melting points of polyolefins, particularly polyethylene, can be too low for some use and maintenance conditions.
• the thermally bondable fibre to adhere firmly to the product to be fixed e.g. knitted or woven fabric
• the chemical structure of both of them must be similar. If -this basic rule is followed, adhesion problems are avoided.
• the raw material of the basic product is polyester (e.g. Dacron or Trevira)
• the thermally bondable fibre to be selected must be a copolyester, not polyolefin or polyamide. In this way, sufficient strength of the thermal bond between the fibres of different material layers is secured.
• a compatibilizer must be used to couple the substances together.
• the binding fibres to be fixed by heat and pressure can be divided into three different classes, namely adhesion fibres, meltable adhesion fibres, and bicomponent fibres.
• Adhesion fibres are normally melt-spinned amorphous polyesters. Due to the lack of crystalline areas, these polymers become sticky on their surface when the temperature rises above 100°C for the first time, wherein they can be calendered to the base material by means of pressure.
• meltable adhesion fibres must be lower than that of the basic material, to which they are adhered by means of heat. Normally, this temperature difference is sufficiently great, 50 to 100°C, to avoid damage to the basic material.
• the melting point is in this case usually less than 205°C, preferably less than 180°C.
• the chemical structure of the basic polymer may have been modified synthetically (copolymerization).
• meltable adhesion fibres are normally copolyesters or copolyamides. Homopolymers are also possible, such as the above-mentioned PVC, PP and PE.
• a bicomponent fibre to be used as a binding fibre two components are combined whose chemical structures are different (e.g. PET and PE) or whose melting points are different.
• An example is a bicomponent polyester fibre whose one area, which is used as the binding agent, melts at a low temperature of 100 to 110°C and whose other area melts at a high temperature of 250 to 265°C.
• the above-mentioned binding fibres are available as staple fibres or filaments, and these fibre types can also be used to make a yam, which can also contain different fibres in a blend.
• the plastic material which melts or softens by the effect of heat is present in at least one of the following parts of artificial furs: the staple fibre 3 forming the pile, the base knitted fabric 1 , and the additional layer 2.
• the word "meltable” is used to refer to both a meltable and a softening polymer material in which the temperature rises by the effect of external energy applied to in such a way that the above-mentioned phenomena take place and the material enters the adhesive state. There is always a change in the state of the material or in the properties of the surface from the solid state to a state which makes the parts adhere to each other.
• A) Meltable binding fibres are blended in staple fibres 3 forming the pile.
• the content of the binding fibres can vary from 0 to 100 %.
• the case 0 % refers to alternative D to be described below.
• a meltable binding filament or yarn is combined to the yarn 1a of the base knitted fabric 1 by multiplication, doubling, double- doubling or another textile technique.
• the content of binding filaments (mono or multi) or yarns can vary from 0 to 100 %. The case 0 % refers to alternative D to be described below.
• the binding plastic component i.e. the binding fibre and/or binding filament or yarn is melted or softened by means of conduction, convection or radiation heat and possi- bly by pressure. Combinations of various melting or softening methods can be used when necessary.
• From the structures of the products A, B and C it is also possible to make an artificial fur with pile on both sides of the product.
• the pile is first bound mechanically to one side of the base knitted fabric, after which a part of the pile is made in a so-called rowing process to extend through the base knitted fabric to the opposite side.
• movable carding means are used to pull out fibres from the textile material, i.e. in this case pile fibres from the opposite side to the other side of the base knitted fabric.
• the staple fibres 3 of the pile, or the yarn 1a of the base knitted fabric 1 , or both are formed of thermoplastics used as general structural elements of textile fabrics, whose chemical materials include meltable polyolefins, polyvinyls, polystyrenes, polyacrylnitriles, polyacryls, meltable derivatives of cellulosic polymers, polyesters and polycarbonates, polysul- phones, polyimides, polyether oxides i.e.
• thermoplastic elastomers such as thermoplastics containing dienes, elastomeric copolymers, such as elastomers containing butadienes, elastomers containing ethylene or propylene, fluoroelastomers, silicon elastomers, or various chemical combination polymers or blends of any of the above- mentioned substances in material, fibre, filament or yarn form.
• the pile or the base knitted fabric or both, depending on the materials, are melted by means of conduction, convection or radiation heat and possibly pressure. The requirement is that the temperature exceeds the melting point of the thermoplastic and the effect is sufficiently long but at the same time sufficiently short.
• a basic product that is, an artificial fur with pile on one side of the base knitted fabric 1 , with no meltable binding fibres blended in the staple fibres 3 forming the pile.
• a film which contains a thermoplastic at least on its surface is laminated as an additional layer 2.
• the material can be of same materials as mentioned in the alternative D above, or their various chemical combination polymers or blends.
• the film can be fully of the same thermoplastic, or it can have a uniform surface layer of a thermoplastic melting at a lower tamperature, or it can have a surface with an adhesive web consisting of fibrous thermoplastic or a spot-gluing pattern whose melting point is lower than that of the actual film.
• the layer 2 is melted onto the base knitted fabric 1 by means of conduction, convection or radiation heat and possibly by pressure.
• the film can have special properties, such as it is breathable, in addition to the properties protecting from wind and rain. Combinations of various melting methods can be used if necessary.
• the film can also be of another material than thermoplastic, if it has any of the above-mentioned thermoplastic structures on the surface adjacent to the base knitted fabric 1.
• the auxiliary layer 2 can also be a felt which contains thermoplastic at least on its surface, and such a felt can consist of a binding fibre or a blend of binding fibres.
• a modified product whose structure can be in accordance with the point A, B, C, D, E, F, G, or H, and in which two artificial furs having pile on one side of their base knitted fabrics 1 are laminated together by means of an auxiliary layer 2, wherein the result is an artificial fur having pile on two sides of the product.
• the structures of the auxiliary layer and the thermoplastic materials therein can be in accordance with those mentioned above.
• a heat-bondable fibre material when used in the pile or in the base knitted fabric, some of the material is of meltable/softening plastic and some remains unchanged under binding conditions.
• These different materials can be in the same fibre (bicomponent fibres) or in different fibres, wherein fibre blends are used in the pile and/or in the base knitted fabric.
• the fibre blend may contain thermally bindable fibres and such synthetic fibres which are not changed under binding conditions, e.g. thermoplastic fibres with a high melting temperature.
• the staple fibres 3 of the pile or the base knitted fabric 1 can contain, as other material components in addition to thermoplastics, natural fibres (0 to 100 %) in the pile or in the base knitted fabric (cotton, linen, hare's-tail cottongrass, wool, etc.) and thermoplastics, such as thermoplastic coatings, applied after the thermal binding of the pile (dispersion of a polyurethane binding agent, containing colour pigments).
• one-sided structures A to I it is also possible to laminate, or fix in another way, such as by glueing, a fashioned or non- fashioned, natural-fibre or synthetic wovwn or knitted fabric or non- woven fabric or planar (xy-plane) component of textile or plastic technology. All the components of the artificial fur can be dyed or patterned according to known dying methods or graphical printing methods.
• the pile of the artificial fur When the pile of the artificial fur is thermally bound to the base knitted fabric, the feel of the product is textile-like. At the same time, the pile is bound to the base knitted fabric by melting instead of mechanical binding, that is, the pile of the artificial fur will not shed in use, and the artificial fur maintains its functional properties, such as thermal insulation capacity, important for use.
• the thermal insulation capability (R c ) of the artificial fur is at least on the level of 0.10 K- ⁇ VVW or better (BS 4745:1990). Thermal fixing processes of meltable binding fibres
• the thermal fixing process must be selected correctly so that the binding fibres would be firmly welded.
• the melted binding fibres are bound to each other primarily at the intersecting points of contact which are present among the adhesion material and/or between the adhesion and the base materials. In the thermal fixing, the following factors should be considered:
• the calibration unit the calibration of the dimensions of the final product
• the cooling unit the cooling of the meltable binding fibres
• the chemical structure of the binding fibres, the content and quantity of the different components the properties of the final product, such as the feel and the strength.
• the method can be applied by an air flow passing through the product or by surface blowing on the product.
• the former method is generally used in the manufacture of thick, porous non-woven fabrics, because in this way the fibres of the inner parts can also be heated.
• the effect of the flow-through is triplicate, but this advantage is lost when the permeability of the product to air is reduced.
• one- or two-sided surface blowing of hot air is suited for the thermal fixing of the pile fibres of the artificial fur.
• the bonding strength is increased, although on the cost of the feel.
• the content of the bonding fibres is too high, the final product becomes brittle and hard. Better strength is achieved with bicomponent fibres than with single-component adhesion fibres, the volume portion being the same.
• the final result is also dependent on the number of contact points between the binding fibres as well as on a compression load possibly used.
• the pile fibres of the artificial fur are fixed so that the length of the pile (protrusion from the level of the base knitted fabric) is from 1 to 50 mm.
• the length of the pile of the artificial fur depends on the length of the staple fibre fed and on the adjustments of the pile shearing stage. Staple fibres which contain meltable/softening plastic material are in a card sliver forming the pile, and/or filaments or yarns containing meltable/ softening plastic material are guided to the knitting machine together with the looping yarn.
• thermal binding of the basic product i.e. the artificial fur
• auxiliary layer 2 on the reverse side by the following methods:
• melt impregnation, or coating, of the flat side of the knit of the artificial fur with a plastic melt e.g. a modification of the paper coating process
• molten thermoplastic when solidifying, forms a uniform film which also constitutes a moisture and air barrier
• meltable/softening fibres and thermal binding in the manufacture of artificial fur the following advantages are obtained in comparison with conventional adhesives and the like (chemical binder bonding):
• the final products can be almost fully (100 %) recycled, because the chemical structure of the binding fibres can be selected to be the same as in the base knit fabric or in the woven fabric.
• Energy saving by avoiding the evaporation of water.
• thermal energy will only be needed from one quarter to one sixth part (1/4 — 1/6) when compared with adhesive binding.
• binding fibres By the selection of the binding fibres, it is possible to affect the properties of the final product, e.g. flexibility and fire resistance.
• meltable fibre was added in the pile or base knitted fabric of the artificial fur.
• meltable staple fibres (15 to 50 wt-%) were blended in the card sliver forming the pile, and in the latter case, filaments were guided to the knitting machine with the looping yarn (multiplication or doubling).
• the tests were made first under very controlled conditions in a laboratory and then in industrial scale. In the tests, the residence times and temperatures were calculated theoretically to make the number of practical tests as small as possible.
• the fastening of the pile fibres of the basic product i.e. the artificial fur, was determined by three different methods: 1.
• the Martindale method SFS 4328 (Textiles. Determination of abrasion resistance of fabrics. Martindale method)
• Embodiment example 1 Meltable fibre in the pile of the artificial fur, fixing in a hot-air frame
• the artificial fur was manufactured with a single-cylinder circular knitting machine.
• a commercial meltable binding fibre Wellbond TO109 (Wellman International Ltd.) was used to replace part of commercial polyester Dacron T688 (DuPont) used as the pile.
• Wellbond TO109 is a bicomponent polyester fibre (coPET/PET) whose surface melts at a low temperature ⁇ 110°C and core at the high temperature of 255°C.
• the basic sample was artificial fur quality T351 with the following structure:
• meltable fibres were fixed to the polyester fibres of the base knitted fabric in an Ernst Benz continuous laboratory frame. In the final adjustment of the process parameters, the product properties are optimized between the feel and the fastening of the pile fibres so that the level of each is sufficient.
• the artificial fur containing meltable pile fibres is heated in a Benz continuous laboratory oven whose upper valve (Klappe) is open (auf) and lower valve (Klappe) is closed (zu).
• the actual test series comprised three different delay times.
• the basis weight of the artificial fur was 240 g/m 2 .
• room temperature (20°C) as the starting point, the temperatures and residence times used in the test series (FRAME) are given in Table 1 :
• Table 1 Values for air temperature and residence time in FRAME test series.
• the sample was placed the pile side down in a bracket. Further, the artificial fur must be stretched in the sample bracket of the frame in such a way that it is subjected to tensile strength.
• the pile side of the frame is protected with a heat-resisting material, e.g. a cloth with an aluminium coating. Heating with air was effected on the reverse side, i.e. the side of the base knitted fabric.
• the result of the test is shown in Fig. 5.
• the first number after the product code T351 indicates the treatment temperature and the second number the residence time.
• the curves of the pilling test indicate that the adhesion of the pile of the artificial fur to the base knitted fabric increases with the thermal treatment, but at the same time the feel becomes harder.
• Embodiment example 2 Meltable fibre in the pile of the artificial fur, fixing with a hot metal surface
• the artificial fur was made with a single-cylinder circular knitting machine.
• a commercial meltable binding fibre Wellbond TO109 (Wellman International Ltd.) was used to replace part of commercial polyester Dacron T688 (DuPont) used as the pile.
• Wellbond TO109 is a bicomponent polyester fibre (coPET/PET) whose surface melts at a low temperature > 110°C and core at the high temperature of 255°C.
• the basic sample was artificial fur quality T351 with the following structure:
• the meltable fibre contained in the pile of the artificial fur was heated by means of a metal surface.
• a device which has an electrically heated pair of plates (e.g. Fixotest).
• Fixotest an electrically heated pair of plates
• the actual test series comprised three residence times (indicated with subindices 1 , 2 and 3); at the same time, the quantity of air contained in the artificial fur (porosity) was assumed to be 20 %.
• the temperatures and residence times of the test series (FIXO) are given in Table 2.
• a sample is placed the pile side down in the Fixotest device, wherein the base knitted fabric of the artificial fur is against the hot metal surface.
• the hot metal surface melts the meltable fibres contained in the pile to adhere to the base knitted fabric within the calculated time of action.
• the pile of the artificial fur, in itself, must not melt in any case, because the feel and bulk of the product are impaired.
• the middlemost upper plate of the Fixotest device is turned against the lower plate, the sample being left therebetween. The sample is subjected to a nominal compression load:
• the artificial fur sample which is freely between the plates of the Fixotest device, is subjected to a pressure whose quantity if 1.8 kPa.
• the result of the test is shown in Fig. 6.
• the first number after the product code T351 indicates the treatment temperature, and the second number the residence time.
• Embodiment example 3 Meltable fibre in the base knitted fabric of the artificial fur, fixing in a hot-air frame
• Meltable binding fibres can be combined to the pile of the artificial fur or the base knitted fabric.
• meltable staple fibres were added to the card sliver (50 wt-%), after which they were melted in a frame (hot air flow).
• the same binding strength of the pile and the base knitted fabric was obtained as with a cross-linkable adhesive.
• polyester filament (PET 167f 32 x 2) of the basic yarn of the base knitted fabric was doubled with a bicomponent multifilament yarn (coPET/PET 278f16) in which the surface of single filaments is PET with a low melting point (160 — 205°C) and core is conventional PET (250— 260°C).
• the former is the yarn of the base knitted fabric in the artificial fur, and the latter is a meltable bicomponent filament.
• the content of meltable fibre in the doubled yarn (167 dtex + 278 dtex) results in 62.5 wt-%.
• the artificial fur indicated with the code T416 has the following structure:
• the artificial fur containing meltable filaments is heated with a Benz continuous laboratory oven, whose upper valve (Klappe) is open (auf) and lower valve (Klappe) is closed (zu).
• the actual test series comprises three different residence times.
• the surface density of the artificial fur is 320 g/m 2 .
• a sample is placed the pile side down in a bracket (to be subjected to the effect of a hot air flow).
• the artificial fur must also be stretched in the sample bracket of the frame so that it is subjected to tensile stress.
• the pile side of the sample is protected with a heat-resistant material, e.g. a cloth with an aluminium coating.
• the test result is given in Fig. 7.
• the first number after the product code T416 indicates the treatment temperature, and the second number the residence time.
• the fastening of the pile of the artificial fur improves with the thermal treatment. It seems that the meltable fibre has a better effect in the pile (Fig. 5) than in the base knitted fabric (Fig. 7). When the meltable fibre is in the base knitted fabric, the feel of the pile remains soft in spite of the thermal treatment.
• Embodiment example 4 Fixing of the pile of the artificial fur with a plastic film
• the artificial fur was made with a single-cylinder circular knitting machine.
• This artificial fur indicated with the product code T513 has the following structure: artificial fur structure (no meltable fibre in the pile): • base knitted fabric: PET 167/32x2 100%
• the pile consists of a blend of polyacryl Dralon L BRT 3.3/28 (Bayer) and polyester Dacron T688 4.7/35 (DuPont), that is, it does not contain a component meltable at the treatment temperatures.
• the basis weight of the artificial fur was 350 g/m 2 .
• Unglued artificial fur was coated with a breathable plastic coating protecting from wind and rain. With the plastic film, the pile of the artificial fur is bound to the base knitted fabric.
• thermoplastic film was laminated on the surface of the base knitted fabric of the artificial fur.
• the following film qualities were used in the test:
• the films were fixed to the base knitted fabric of the artificial fur with a gluing press (Meyer KF600), in which the product was run between two heatable rubber bands. At the starting end of the line, the film was heated above the melting point, and at the terminal end, the film was fixed by compression to the surface of the fabric. The film was melted onto the surface of the artificial fur.
• the quality of the second adhesive web used was Sharnet SH 2402 which is a polyamide.
• the processing conditions are given in Table 4.
• the adhesive web was used in connection with hydrophilic films, i.e. the samples 2 and 3.
• Porelle films (sample 1) contain densely distributed adhesive points of a melting plastic which bind them to the product to be covered.
• Fig. 8 shows the effect of a laminated plastic film on the fastening of the pile when the artificial fur contains no meltable binding fibre.
• the reference samples are unglued artificial furs T351 and T513. The best is the sample which is laminated with a Symbatex film. The lamination of the plastic film will fully replace the adhesion of the pile of the artificial fur; at the same time, a breathing water-tight and air-tight product is obtained.
• the artificial fur can also be made impermeable to e.g. an air flow and water (Figs. 9 and 10).
• Figure 9 shows the effect of a laminated plastic film on the permeability of the artificial fur T513 to air
• Fig. 10 shows the effect of the laminated plastic film on the resistance to hydrostatic pres- sure.
• the wear resistance of laminated samples can be improved by coating the plastic film with a very thin knitted or woven fabric or cloth. This makes it also possible to fashion the surface of the artificial fur with any pattern.
• the feel of this product is fully textile-like, i.e. better than with artificial furs bound with an adhesive emulsion.
• laminated samples are breathing, their permeability to aqueous vapour is the same as that of uncoated artificial fur T513. Furthermore, laminated artificial furs are air-tight, because they are not permeable to air in practice.
• the resistance of laminated products to hydrostatic pressure is more than 10 m; the corresponding value for glued artificial furs is only 1 to 5 cm.
• the best product throughout the whole series was the artificial fur coated with the Symbatex film.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Knitting Of Fabric (AREA)
• Treatment Of Fiber Materials (AREA)

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Cited By (9)

Citations (6)

• 1999
  • 1999-01-15 AU AU20551/99A patent/AU2055199A/en not_active Abandoned
  • 1999-01-15 EP EP99900885A patent/EP1159474A1/en not_active Withdrawn
  • 1999-01-15 EA EA200100800A patent/EA003479B1/ru not_active IP Right Cessation
  • 1999-01-15 WO PCT/FI1999/000023 patent/WO2000044969A1/en not_active Application Discontinuation
  • 1999-01-15 CZ CZ20012505A patent/CZ20012505A3/cs unknown
  • 1999-01-15 SK SK1012-2001A patent/SK10122001A3/sk unknown

Patent Citations (6)

Non-Patent Citations (1)

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