MXPA99003435A - Process for coating an elast thread - Google Patents

Abstract

The present invention relates to a method for applying fluids to a yarn and using it to bond adhesive coated yarns to a substrate in the production of absorbent articles of body fluids, when conducting the yarn along an isolated path, moving the fluid or the adhesive fiber forward or backward through the yarn course, as the fluid fiber is fed into the yarn and capturing substantially all of the fluid fiber in the insulated yarn and in some applications contacting the yarn. Adhesive coated yarn with the substrate for joining the yarn thereto. The adhesive fiber is oscillated back and forth along the thread path beyond the opposite sides thereof to at least partially coat all sides thereof with adhesive. In the hygienic articles that absorb bodily fluids, the methods substantially eliminate the hardening of the fiber and the loss of the moisture absorption capacity thereof, providing a substantially uniform bond along the dimension towards the yarn to ensure the bond Uniform of fabrics, optimal fluid absorption and comfort

Description

PROCESS TO COVER A THREAD THE STICO CROSS REFERENCE WITH THE RELATED APPLICATIONS This application is related to the Application of the United States, 08 / 843,224, registered on April 14, 1997, entitled "Improved Blend Improvement Method and System and the US Application co-pending with Númer 08 / 717,080, filed October 8, 1996 entitled "Blow-by-blow Method and Apparatus", all assigned and incorporated herein by reference, BACKGROUND OF THE INVENTION In general, the invention is relates to systems that dispense adhesives, and more particularly, processes to join one or more relatively long yarns one or more substrates, especially joining the elastic bands to fabrics for the manufacture of hygienic articles that absorb body fluids. adhering relatively elongate members, or threads, to substrates In the production of a variety of hygienic articles co absorbent of body fluids, which includes diapers, incontinence towels and other types of interior rop, the elastic strips are joined between the fabric to form bands. antiescurrimiento and other portions that can be stretched from them. In diapers, the anti-scuff band and particularly the leg bands should provide relatively impervious seals to the fluid between the underwear and the body. In the manufacturing processes of the hygienic articles that absorb body fluids, already known, the adhesive is placed in the elastics disposed in or close to a cloth substrate that move in relation to the nozzles that dispense the adhesive. Usually, the adhesive is heat-melted and is dispensed or provided in a spiral pattern of turbulence by a spiral nozzle, and then applied generously, on both substrates and on the elastic yarns simultaneously. In a usual manner, the elastic yarn s unites between the layers of fabric superimposed. As the elastic threads contract, the fabric adhered thereto joins to form the anti-drip bands, which are generally gathered, and other stretchable portions of the inside rop. It is important that the elastic yarn be bonded to the web in a substantially continuous fashion along the axial length to ensure a uniform puckering, or binding, of the fabric which is necessary to obtain maximum fluid absorption comfort, as well as to provide an aesthetically pleasing product. U.S. Patent Number 5,507,909 issued April 16, 1996, entitled "Apparatus for Producing an Elongated Element Comprising an Adhesi Applied in an Elliptical Pattern" presents a process and apparatus for wrapping adhesive, in clean form, in an elastic thread, which is attached to a substrate in the production of disposable absorbent products without adjacent areas of the substrate coating, which have a large amount of adhesive. To achieve an elliptical coating of the elastic yarn with the adhesive, the yarn rotates around its axis and is passed through the flow of the adhesive leaving a dispensing orifice, for example, by placing the elastic yarn between a cylinder assembly posterior stretch that rotates at an angle relative to it, or other methods, which use mechanisms to turn the thread that are less accurate. However, known processes generally apply much more adhesive on the elastic threads and on the underlying substrate than the adhesive required for bonding which results in an unnecessary increase in costs. Excess adhesive, which is generally also hot It tends to deform fabrics that are relatively thin and sensitive to temperature, thus providing an undesirable appearance. In extreme cases, the hot adhesive can destroy or ruin the fabric by burning the same in a hole. Other adverse effects when applying excessive amounts of adhesive on the fabric is that the adhesive tends to harden the fabric. This hardening is particularly desired in diapers and other uses in underwear where the elastic threads bind the fabric to form the anti-sway bands or other elastic portions that are in contact with the body. More particularly, the hardened fabric does not bind as freely and uniformly as it would like, therefore, it compromises the fabric's ability to form an effective anti-fluid seal when placed against the body of the person using the garment. The excess adhesive applied to the fabric can also reduce the absorption capacity of the fluids, which results in the possibility of leakage of body fluids and the accumulation of moisture by perspiration in the body of the person using the garment. What can be particularly uncomfortable when the legs and anti-wear bands come in direct contact with the skin. Additionally, the fabric that is hardened by the adhesive may be abrasive or irritating to the skin, and in some cases extreme may cause allergic reactions to very sensitive skin. The process and the apparatus presented in the U.S. Patent No. 5,507,909, of the prior art entitled "Apparatus for Making an Elongated Element Comprising an Applied Adhesive in an Elliptical Patro" slightly reduces the amount of adhesive applied to the substrate and dispenses smaller quantities of adhesive in the elastic threads, but the uniform application of the adhesive, in elliptical form, around a thread requires a uniform and consistent control of the rotation or rotation of the thread during its travel. It is questionable whether the elastic thread can rotate consistently and uniformly as required to apply the adhesive, elliptically around it in the processing operations. If the adhesive is not applied uniformly along the axial dimension of the yarn, the elastic yarn will not uniformly bond to the substrate, which will adversely affect the uniform bonding of the fabric. The non-uniform union is an undesirable aspect from the aesthetic point of view, and in addition a non-uniform union of the fabric compromises the capacity thereof to form an effective antifluid seal, and reduces the softness and comfort thereof when applies or comes in contact with the body of the person who will use the garment. The present invention is directed, generally, to the advances in the technique for applying fluids, including adhesives in yarns, and more particularly refers to the bonding of coated yarns of adhesives on a substrate especially the joining of elastic yarns coated with adhesive to the fabrics for the manufacture of hygienic articles that absorb body fluids. An object of the invention is to provide novel methods for applying fluids to the yarns, and for bonding the coated yarns with adhesive to substrates, as well as the combination thereof, which are economical to solve the problems of the prior art. Another object of the invention is to provide novel methods for the application of heat-melt adhesives elastic yarns and to join the elastic yarns coated with adhesive to the fabrics, thus forming traction bands other stretched portions, for the preparation of a variety of articles hygienic that absorb body fluid and disposable absorbent products, using reduced amounts of adhesive. It is another object of the invention to provide novel methods for bonding elastic yarns coated with adhesive to fabric substrates in the manufacture of a variety of hygienic articles that absorb body fluids, wherein the elastic yarn is attached to the formed fabric. substantially uniform along an axial length to ensure uniform bonding of the fabric, so that it provides optimum fluid absorption and comfort, as well as a product that is aesthetically pleasing which makes it more marketable. Still another object of the invention is to provide novel methods for reducing the amount of adhesive applied to the elastic threads that attach to the lower cloth substrates in the manufacture of a variety of hygienic articles that absorb body fluids, to reduce thus the possibility of melting or melting the fabric with the hot-melt adhesives, to substantially remove and harden the fabric and to eliminate the loss of the ability to absorb moisture thereof, as well as to reduce the costs, especially the costs associated with the excessive use of adhesive. It is a more particular object of the invention to provide novel methods for applying fluids to a yarn, which are used to join the yarn to a substrate, in the elaboration of hygienic articles that absorb the body fluid, when placing the yarn along the an insulated travel, moving the fluid fiber through the yarn path, as the fluid fiber is dispensed or placed in the yarn, so that the fiber comes into contact with the yarn, and substantially captures all the fiber in the isolated hil. Preferablythat's it. , the fiber is tilted back and forth through a thread path, and beyond the opposite sides thereof to partially coat all sides of the thread with fluid. A more particular objective of the invention is to provide novel methods for joining yarns on substrate, and the manufacture of hygienic articles that absorb body fluids by placing the yarn along a separate path, is partially, of the substrate, placing a fiber of adhesive in the yarn so that at least a portion of the adhesive fiber crosses the path of the yarn comes into contact with it, capturing substantially all of the adhesive fiber in the yarn when it is separated from the substrate in order to coat , at least partially, the adhesive thread and contact adhesive coated wire with the substrate to join both. Preferably, the fiber is oscillated or moved back and forth through the path of the yarn and beyond the opposite sides thereof to coat, at least partially, all sides of the yarn with adhesive. These and other objects, aspects, features and advantages of the present invention will be more apparent after careful consideration of the following detailed description of the invention and the accompanying drawings, which may have disproportionate, or enlarged, aspects to facilitate understanding, in where similar steps and structure are generally referred to by corresponding indicator numerals. BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is an elevated view, of a partial lateral view of the system for applying fluids to the yarns and for bonding adhesive coated yarns to a substrate, according to the exemplary form of the invention. FIGURE 2a is a partial sectional view of the fluid fibers dispensed to the corresponding yarns. FIGURE 2b is an end view of the exemplary nozzle for dispensing a plurality of fluid fibers in the corresponding plurality of yarns. FIGURE 3 is a partial perspective view of a thread that is at least partially coated with fluid on all sides, in accordance with the exemplary embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION FIGURE 1 is a system 10 for carrying out the methods of applying fluids, including adhesives to the yarns, and in some applications, bonding the coated yarns of adhesive to substrates according to the present invention. The exemplary system 10 dispenses hot melt adhesive fibers 40 from one or more adhesive dispensing nozzles 20, which preferably are blow-by-blow nozzles having one or more adhesive dispensing orifices and the corresponding first and second dispensing orifices d air placed on opposite sides thereof, as shown in FIGURE 2 and will be explained below. The present invention is generally more useful for applying fluids 40 to yarns 30, which substantially capture all of the fluid that leaves the nozzles 20 to prevent undesired application of fluids to a substrate or other areas, as well as to reduce the waste of the fluid.

An exemplary application is the bonding of adhesive-coated elastic yarns 30 on fabric substrates 5 for the manufacture of a variety of hygienic articles that absorb body fluids. The methods of the present invention are particularly useful in applications where precise control of the supply of relatively viscous fluids, including but not limited to heat-melted adhesive fibers, is generally desired in a yarn, is also useful for some applications where the adhesive coated yarns are attached to substrates, as discussed below. Thus, the fluid fibers 4 supplied from the nozzle 20 are not necessarily limited to melt-blown fibers, but more generally refer to any fluid that can be supplied in a controlled manner, so that substantially all the fluid s applies to the thread 30. In the fiber 1, the nozzle 20 supplies a fluid fiber 40 to an insulated thread 30 that passes along the path, so that at least a portion of the fluid fiber 40 crosses the path of the thread 30. , and comes in contact with the yarn so that the fluid fiber 40 is attached thereto. The separate insulated yarn 30 substantially captures all fiber fluid 40 supplied from the die 20, by which the yarn 30 is coated, at least Partially With the Fluid When capturing substantially all of the fluid supplied from the nozzle 20 in the separate insulated yarn 30, maximum utilization is achieved, with very little waste of fluid, so it is economized in the application the same. By capturing all of the fluid fiber 40 in the yarn 30, the possibility of the fluid spilling or inadvertently applying to areas to which it is not desired to apply, for example, the underlying substrates, is also reduced. The fluid fiber 40 is preferably a substantially continuous fibr although it can be supplied discontinuously, as long as the fiber portion crosses and travels the yarn and is bonded thereto. FIGURE 2a illustrates a fluid fiber, which preferably moves backwardly forward through the path of the thread 30 as the fluid fiber 40 is supplied in the direction of the thread 30. The viscosity, mass and range of movement of the fluid fiber 40, forwards and backwards along the thread path 30 is selected and controlled so that the insulated wire 30 substantially captures all of the fluid fiber 40 supplied from the nozzle 20. For example, the variations e the supply of the fluid fiber 40 from the nozzle 20 due to changes in supply pressure and accumulation of residues in the orifice of the nozzle, as well as other factors, can result in a discontinuous application of the fluid fiber. or irregularities in the fluid supply, which would occasionally prevent complete application to the yarn 30 of the fibers 40 or portions thereof. FIGURES 2a and 3 illustrate the fluid fiber 40 and its forward and backward movement through the thread travel 30, wherein the fluid fiber portions 42 and 44 move past the corresponding opposite sides 32 and 34. of the yarn 30, as the fluid fiber 40 is supplied or provided to the yarn 30. Thus, the fluid fibers that are dispensed are captured substantially in their entirety, by the yarn 30, therefore all the yarn sides 30 are at least partially coated with fluid. Once applied, the fluid fibers 40 cover the thread 30 in a substantially uniform manner along the axial dimension or the length thereof, which is very desirable in many applications, particularly for the manufacture of sanitary articles that absorb bodily fluids, where a uniform bonding of elastic thread coated with adhesive is desired with the substrate of the fabric to achieve a uniform grouping of the fabric that forms the anti-drip bands and the other portions that can be stretched therefrom. The substantially uniform application of the adhesive fibers 40 along the axial dimension of the thread 30, without completely coating the yarn also substantially reduces the use of adhesive while providing a relatively uniform bond with the substrate FIGURE 3 illustrates, more particularly, the fiber portions 42 and 44 that line or fall downward along the length of the yarns. corresponding sides 32 and 34 of the yarn 30 after other fiber portions 41 come into contact with the yarn 30. The fiber portions 42 and 44, preferably s, are provided by a nozzle 20 extending enough to the corresponding sides 32 and 34 of the thread 30, so that the portions thereof 43, also adhere to the lower part 36 of the thread 30. In some applications, the fiber portions 42 and 44 may extend further and adhere along one side of the thread, along the bottom side thereof, and back up the length of the opposite side of the thread 30, sometimes more than once wrapping the entire thread. The portions 42 and 44 of the fiber that move back and forth through the path of the thread 30, a combination of both fall on it under the influence of moment or gravity, and finally the fiber 40 adheres at least partially, on all sides of the thread 30 including the upper part 31, the opposite sides 32 and 34 as well as the lower side 36 thereof. The adhesive fiber 4 is preferably supplied from the nozzle 20 located above the insulated wire 30, and initially adhering to the upper side 31 of the yarn 30. Then, the fiber 40 is moved down along the sides of the yarn. yarn 30 and through the underside thereof to coat, at least partially all sides of the yarn. Thus, the adhesive should be applied uniformly along the axial dimension of the yarn 30, if it covers the entire yarn, so that it is economized in the application of adhesive and at the same time appropriate amounts of the adhesive are applied to the yarn. , to ensure uniform bonding of the yarn 30 through axial dimension with the substrate. Preferably, the fiber portions 42 and 44 are not supplied so as to extend beyond the corresponding sides 32 and 34 of the yarn 30, so that the fluid fiber 40 can not be captured, substantially entirely, with the fiber 40. yarn 30. The average flow of the fluid fiber mass, the viscosity of the fluid, as well as the size and stability of the yarn 30 are some of the limiting factors of the extent to which the fiber 40 can arrive, without passing the sides of the thread 30 so that the fluid is captured almost entirely by the thread. The precise control of supply of fluid fibers from the nozzle 20 ensures that the thread 30 captures substantially all of the fluid fiber 40. The precise control of the supply of the fluid fibers 40 also ensures that the fluid is at least partially applied at almost all sides of thread 30 and substantially uniform along the axial dimension thereof. With proper control of fluid delivery, and generally an average in which the yarn 30 is placed in relation to the nozzle 20, it is possible to accurately control the amount of fluid that is applied to the yarn. In the exemplary application, the fluid fiber 40 is a substantially continuous, heat-melted adhesive fiber which is supplied from the adhesive hole G d to a blow-by-blow nozzle 20. In FIGURE 2a, the adhesive fiber is illustrated. 40 in its forward and backward movement through the path of the thread 30, and beyond the opposite sides thereof, under the influence of a first second air flows provided from a first and second air hole Al and A2, placed on opposite sides of the corresponding adhesive holes Gl and G2 of the nozzle 20. The amplitude and frequency of the oscillation of the adhesive fibers 40 is controlled by the first and second air flows which are presented in more detail in FIG. United States Application Copending Number 08/843, 224, entitled "Improved Blow Molding Method and Method", and copending US Application No. 08 / 717,080 entitled "Fusion Blowing Method and Apparatus". In an alternative embodiment, the heat-melt adhesive fibers are supplied from a spiral die in a turbulence pattern to move the adhesive fiber back and forth along the yarn path, as the adhesive fiber is applied to the adhesive fiber. place in the thread. However, meltblowing nozzles of the type presented in the aforementioned U.S. Copendient Application No. 08 / 843,224 entitled "Improved Fusion Blowing System Method" and the United States Copending Application Number 08 were believed. / 717,080 entitled "Method and Fusion Blowing Apparatus" provide a relatively superior control over the flow of the adhesive compared to known spiral nozzles, and are particularly suitable for applying adhesive fiber which is captured, substantially in its entirety, by the corresponding yarn according to the present invention. In applications where the yarn 30 is bonded between the substrates and where the yarn 30 has the tendency to twist before being bonded to a single substrate, it is desired to coat, at least partially, all sides of the yarn 30 with a adhesive, for ensure full bonding of the yarn 30 with the substrate 50. In other applications, for example, where the elastic yarn 30 forms an anti-drip band or other elastic portion of the underwear, it is desirable to apply the adhesive in a substantially uniform manner throughout of the axial dimension thereof and preferably at least on all sides of the thread, to ensure a uniform bonding of the thread 30 along the axial dimension thereof with the substrate of the fabric, therefore a substantially joined uniform of the fabric as it comes in contact with the elastic thread. The extent to which the thread 30 is coated with the adhesive is generally controlled by means of the average flow of the fiber mass of the adhesive, the amplitude and frequency of oscillation of the fiber, as well as the average displacement of the yarn. FIGURE 1 illustrates the application of adhesive fibers in a yarn 30 and the bonding of the coated yarn with adhesive 30 to a substrate 50. Initially, the yarn 30 s leads along the separate path of the substrate 50. The adhesive fibers 40 is supplied to the insulated wire 30 d such that at least a portion of the adhesive fiber 4 crosses the path of the thread 30 and is bonded thereto, as shown in FIG. 2. As discussed above, preferably the fiber 40 is oscillated forwardly backward through the path of thread 30, beyond the opposite sides thereof. The yarn 30 substantially captures the entire adhesive fiber 40, when the yarn 30 is separated from the substrate 50 to at least partially coat the yarn 3 with adhesive. Preferably, the adhesive is applied at least partially to all sides of the yarn 30 to ensure uniform bonding of the yarn along the axial dimension thereof with the substrate 50. The yarn coated with adhesive 3 comes into contact with it as well. with the substrate 50 for joining the yarn 3 thereto before placing the adhesive. In the manufacture of hygienic articles which absorb bodily fluids, the substrate 50 is fabric, and the yarn 30 is an elastic yarn which is stretched by applying tension thereto, before being attached to the substrate 50. FIGURE 1 illustrates the yarn 30 and the yarn 30. substrate 50 both driven by a common roller 60. In the exemplary application, the elastic yarn coated with stretchable adhesive 30 is also attached to a second cloth substrate 70, which can also be driven by means of the roller 60, whereby the yarn 30 is placed between and is bonded to substrat 50 and substrate 70. The adhesive is applied, at least partially to all sides of the yarn 30 and preferably d uniformly along the axial dimension thereof., ta and as discussed above, to ensure that the yarn 3 is uniformly joined to the two fabric substrates 50 and 70. In the applications where the substrate 70 is close to the yarn 30 and as opposed to the dispensing nozzle d adhesive 20, it is necessary to separate the substrate 50 from the yarn 3 by a distance "d" greater than the distance of fall of the adhesive fiber 40 below the yarn 30, as opposed to the adhesive nozzle 20 to prevent the adhesive from sticking inadvertently to the substrate 50. In other applications, the adhesive 40 can be applied to the yarn 30 separated from the substrat 50 to ensure that no amount of adhesive 40 is inadvertently applied thereto, where the substrate 50 can be supplied, for example, below the roll 80 along the path 52, away from the fluid fibers 40 dispensed by the nozzle 20.

FIGURE 2a illustrates a nozzle 20 that supplies a plurality of at least two adhesive fluids or fibers 4 of a corresponding plurality of adhesive holes G and G2 to the corresponding insulated wires 30, where each of the plurality of adhesive fibers 40 is tilted back and forth along the corresponding thread travel 30 with a plurality of a first second air streams supplied from the first and second air holes Al and A2, arranged on opposite sides of the air holes of the first and second air holes. corresponding adhesive Gl and G2, according to the modes of operation discussed above, particularly those which are presented in greater detail in the copending United States Application mentioned above Number 08 / 843,224, entitled "Improved Method and System of Blown by Fusion" and U.S. Application No. 08 / 717,080 entitled "Method and Blow by Fusion Apparatus". Each yarn 30 substantially captures all of the adhesive fiber 40 that is supplied from the corresponding adhesive hole Gl and G2, when the yarn 30 is separated from the substrate to at least partially coat the yarn 30 with the adhesive. The adhesive fibers are preferably oscillated back and forth along the course of the corresponding yarn beyond the opposite sides thereof, to coat, at least partially, all sides of each yarn with adhesive, preferably uniformly along the axial dimension of it. In some applications, the plurality of adhesive coated yarns are subsequently contacted with no more substrates to join this plurality of yarns therewith, as discussed above. FIGURE 2a illustrates the plurality of adhesive holes Gl and G2, as well as the corresponding air holes in the nozzle 20 generally arranged in a series. In one embodiment illustrated in FIGURE 2b, the adjacent adhesive fibers are dispensed from the adhesive holes Gl and G2 with the corresponding air holes Al and A2 positioned, or spaced, relative to each other in different planes of the nozzle 20. For example, all the holes of adhesive with opposite numbers Gl and G3, as well as the corresponding air holes, are arranged in series in a first plane, and all the holes of adhesive with even numbers G2 and G4 as well as the holes of corresponding air, are arranged in series in a second plan different from the first, therefore, the adjacent adhesive flows are exited axially along the thread 30, as illustrated by the adhesive flows 40 and 49 in FIGURE 1. Alternatively, all adhesive dispensing holes can be arranged in series in a single common plane. These various aspects of adhesive dispensing nozzles are presented in more detail in the copending United States Application mentioned above, No. 08 / 843,224 entitled "Improved Method and Improved Fusion System" and the Copending United States Application No. 08 / 717,080 entitled "Method and Fusion Blowing Apparatus". FIGURE 2a illustrates the amplitude of the oscillation d of the adjacent fibers 40, apparently superimposed if they interfere with each other. More particularly, when the adhesive dispensing orifices Gl and G2 are adjacent to each other, in a common plane, the oscillating fibers 40 that are supplied through these holes have the tendency to synchronize or separate from the common plane in one direction over the other of the axial direction of the corresponding thread 3 to avoid interference with each other. This phenomenon makes it possible to dispense or supply the adhesive fiber or fibers 40 from relatively close adhesive dispensing holes towards the corresponding relatively close threads 30, where the adhesive fibers 4 apparently oscillate overlapping but without interfering therewith. Thus the threads 30, substantially capture all the oscillating fibers 40, as discussed above, if to interfere with the adjacent fibers 40 and without spilling apply a higher amount of adhesive, resulting from the interference between the adjacent fibers.

While the above written description of the invention allows a person skilled in the art to make and use what is considered herein as the best embodiment of the invention, those skilled in the art will appreciate the existence of variations, equivalent combinations of the fashions of the invention. Exemplary realization, specific to it. Therefore, the invention is not limited to exemplary embodiments but to all exemplary embodiments that fall within the scope and spirit of the appended claims.

Claims (25)

1. CLAIMS 1. A method for the application of adhesive to yarn, and use for joining the yarn to a substrate in the manufacture of hygienic articles that absorb body fluids, and the method comprises: moving the yarn along the distance separated from the substrate; dispense or supply the yarn adhesive fiber; capturing substantially all of the adhesive fiber in the yarn, when the yarn is separated from the substrate; contacting the adhesive coated wire with the substrate to bond the wire to the substrate.
2. 2. The method according to claim 1, further comprising moving the adhesive fiber back and forth along the thread path, as the adhesive fiber is delivered to the thread.
3. 3. The method according to claim 1, further comprising supplying a substantially continuous adhesive fiber to the yarn and moving the adhesive fiber back and forth along the yarn course as the adhesive fiber is applied to the yarn. supplies to the thread.
4. 4. The method according to Claim 1, e that the yarn is an elastic yarn and the substrate is fabric for a hygienic article that absorbs body fluid, the method further comprising stretching the elastic yarn before it is attached to the substrate. .
5. The method according to Claim 1, wherein the adhesive fiber is a hot melt adhesive supplied from an adhesive orifice of a meltblown nozzle, the method further comprising oscillating the adhesive fiber forward and toward back along the course of the yarn with a first and second air streams supplied from a first and second air holes, arranged on opposite sides of the adhesive orifice.
6. 6. The method according to Claim 5, further comprising controlling the amplitude and frequency of the oscillation of the adhesive fiber with a first and second air stream to capture substantially all of the adhesive fiber in the yarn.
7. The method according to Claim 5, further comprising controlling the amplitude and frequency d of the oscillation of the adhesive fiber with a first and second air stream, so that the yarn is coated, substantially uniform in shape with the adhesive along the axial dimension of the thread.
8. 8. The method according to claim 5, further comprising supplying the adhesive above yarn, and separating the yarn from the substrate by a distance may to the falling distance of the adhesive fiber below the opposite yarn, where the adhesive fiber is supplied po over the yarn.
9. 9. The method according to Claim 6 which further comprises: supplying a plurality of at least threads; supplying a plurality of adhesive fibers of the corresponding plurality of adhesive holes, d the nozzle, towards the corresponding one of the plurality d threads; oscillating the plurality of adhesive fibers forward and backward along the course of the corresponding thread with a plurality of one or two air flow supplied from the first and second air holes d disposed on opposite sides of the plurality of air orifice. adhesive; each yarn substantially captures all the fibr of adhesive supplied from the corresponding adhesive hole when the yarn is separated from the substrate to coat, substantially uniformly, the yarn with adhesive; and contacting the plurality of adhesive coated yarn with the substrate to join the plurality of yarns to the substrate.
10. 10. The method according to Claim 9, further comprising providing the corresponding plurality of air flows and the corresponding plurality of air holes arranged in series with the corresponding plurality of adhesive holes.
11. 11. The method according to claim 9, further comprising supplying at least two adjacent adhesive fibers from the corresponding adhesive holes axially outward relative to each other., along the path of the thread.
12. 12. The method according to claim 1, wherein the adhesive fiber is a hot melt adhesive, and the method further comprises supplying the adhesive fiber in a spiral nozzle in a turbulence pattern, to move the adhesive fiber towards forward and backward along the yarn run as the adhesive fiber is fed to the yarn.
13. 13. The method to apply the fluid to a thread, use it to join the thread to a substrate in the elaboration of hygienic articles that absorb body fluids, and the method includes: supplying a thread along a pattern of an isolated path; dispense the fluid fiber to the yarn; moving the fluid fiber forward and backward along the course of the yarn as the fibr of fluid is dispensed towards the yarn; capturing substantially all of the fiber d fluid in the yarn; and cover all sides of the thread, at least partially, with fluid.
14. 14. The method according to claim 14, further comprising moving the fluid fiber forwardly back along the yarn path, past the opposite sides of the yarn, as the fiber is supplied to the yarn. to coat all sides of the thread at least partially, like a fluid.
15. 15. The method according to claim 14, wherein the fluid is adhesive, the method further comprising: supplying the yarn along the course separated from the substrate; supply an adhesive fiber above yarn; moving the adhesive fiber back and forth along the thread path, as the adhesive fiber is dispensed towards the thread; capturing, substantially all, the adhesive fiber in the yarn when the yarn is separated from the substrate; cover all sides of the yarn, at least partially, with adhesive when the yarn is separated from the substrate; and contacting the coated wire with adhesive to the substrate to bond the wire to the substrate.
16. 16. The method according to claim 15, wherein the yarn is an elastic yarn and the substrate is a tel for making hygienic articles that absorb body fluids, the method further comprising stretching the elastic yarn before that yarn is attached. with the substrate.
17. 17. The method according to claim 15, further comprising separating the yarn from the substrate by a distance greater than the falling distance of the adhesive fiber, below the opposite yarn from where the adhesive fiber is supplied from below the fiber. thread.
18. 18. The method according to Claim 15 wherein the adhesive fiber is a hot-melt adhesive, the method further comprising supplying the adhesive fiber from the spiral die in a turbulence pattern to move the adhesive fiber forward and backward. back along the length of the yarn run, under the opposite sides of yarn as the adhesive fiber is dispensed or fed into the yarn.
19. 19. The method according to Claim 15 further comprising bonding the coated wire with adhesive to a second substrate, whereby the wire is disposed between the substrate and the second substrate.
20. 20. The method according to Claim 15 wherein the adhesive fiber is a permeated melt adhesive that is supplied from an adhesive orifice of a meltblown nozzle, the method further comprising oscillating the adhesive fiber forward and toward back along the course of the yarn beyond the opposite sides of the yarn with the first and second air streams supplied from the first and second air holes disposed on the opposite side of the adhesive orifice.
21. 21. The method according to Claim 20 further comprising controlling the amplitude and frequency d hesitation of the adhesive fiber with the first and second air flows so that substantially all of the adhesive fiber d is captured by the yarn.
22. 22. The method according to Claim 20 further comprising controlling the amplitude and frequency d of the oscillation of the adhesive fiber with a first and second airflow so that the yarn is coated substantially uniformly with the adhesive to the adhesive. the length of the axial dimension of the thread.
23. 23. The method according to Claim 20 further comprising: supplying a plurality of at least threads; supplying a plurality of adhesive fibers of the plurality of corresponding adhesive holes of the plurality of threads; oscillating the plurality of adhesive fibers back and forth along the course of the corresponding wire and past the opposite sides of the wire with a plurality of corresponding first and second air holes arranged on opposite sides of the plurality of holes of adhesive; each yarn captures substantially all of the adhesive fiber supplied from the corresponding adhesive hole when the yarn is separated from the substrate, coating, at least partially, all sides of each yarn with an adhesive when the plurality of yarn is separated from the substrate; and coating the plurality of adhesive coated yarns with the substrate to join the plurality of yarns to the substrate. 2 .
24. The method according to Claim 23 t further comprising providing the corresponding plurality of air flows of the corresponding plurality of air holes arranged in series with a corresponding plurality of adhesive holes.
25. 25. The method according to claim 22, further comprising supplying at least two adjacent adhesive fibers from the corresponding adhesive hole axially outward relative to one another along the thread travel.