JPH01239150A - Arrangement fixing method of multifilament group - Google Patents

Abstract

PURPOSE:To fixing arrangement of fiber group with solidified bonding filaments, by scattering a polymer liquid having adhesive ability and spinnability with air in a process of plane-like running of many filaments at a constant interval. CONSTITUTION:A polymer melt 3 ejected from spray guns 2a, 2b,... is scattered in filament-like with air against running filament group 1 and bonded thereon so that mainly the bonded filaments are transversely arranged, then the arrangement of the filament group 1 is fixed by bonding of solidified filaments web.

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention fixes the arrangement of a large number of yarn groups, uses them as an aggregate, and further uses it as a weft web of a weft/warp orthogonal nonwoven fabric. However, as a special application, it is also used in adhesive nonwoven fabrics with threads in the vertical direction.

b. Prior Art and Problems to be Solved by the Present Invention In recent years, industry has begun to mass-produce strong orthogonal nonwoven fabrics in which a large number of yarn groups are orthogonally crossed in warp and warp directions using warp and warp laminating machines. The present inventors also published Japanese Patent Publication No. 50-40185 and Japanese Patent Publication No. 53-38783 as a laminating machine for manufacturing these machines.
He has already invented a number, etc. The present invention is based on these
The purpose is to fix the arrangement of a large number of independent groups of weft yarns, smooth the warp and warp lamination process, and improve the quality of the product by arranging the yarn groups of the warp and weft in an orderly manner. For this purpose, the inventors of the present invention
The present invention can be said to be an additional invention to the ``method for continuously fixing the arrangement of threads'' using the centrifugal spinning method in No. 067. The method using the centrifugal spinning method of the previous invention is a method in which adhesive filaments are spun from inside the cylinder of a thread group traveling in a cylindrical shape using a rotating nozzle similar to the cotton candy method, and the adhesive filament is spun in the direction of travel of the yarn group. The adhesive filament fibers can be ideally and orderly arranged in the horizontal direction, the adhesive filament fibers can be applied evenly in basis weight, and the line speed can be as high as 100 m/min. It has various characteristics. However, since it is necessary to return the yarn group to a flat shape rather than a cylindrical shape, a larger three-dimensional space is required, which increases the cost of the device. It is also difficult to apply it intermittently.

Therefore, there has been a strong need for a method that can be applied on a flat surface using a simple device and that can be applied intermittently.

The importance of intermittent application is that if the adhesive fibers applied here become a nuisance in the final product, for example, the threads to be laminated in the warp and warp already have adhesive ability and only serve the purpose of fixing the arrangement of the weft threads. If it is possible to stack the warp and warp yarns in an orderly manner, it is possible to bond the warp and warp yarn groups in a subsequent process without applying an adhesive. Another example is when the yarn itself does not have adhesive ability, but the adhesive filament applied to fix the yarn arrangement is not suitable for the final product in terms of heat resistance, chemical resistance, etc.
After laminating the warp and warp, the yarns of the warp and warp are bonded and fixed using an adhesive suitable for the purpose, such as an emulsion adhesive. In such a case, as will be explained in detail later, the arrangement of the weft threads supplied by the warp/warp stacking machine should be fixed only in the vicinity of the cutting area, and the adhesive material used to fix the arrangement should be fixed. are the ends of both ends of the product after lamination, and there was a strong need for a method that would allow these parts to be trimmed so that they would not remain in the final product. These problems could not be solved by conventional techniques.

Means for Solving Problem C1 In order to solve the above problem, the inventors of the present invention continued their intensive research, and found that in the process of a large number of threads being arranged at regular intervals and running in a plane, adhesiveness The above problem can be solved by scattering a polymer liquid with high performance and stringiness using air, allowing it to arrive at the yarn group and bonding it, coagulating the adhesive filament, and fixing the arrangement of the yarn group with the coagulated filament. I found out. Furthermore, in a method for arranging and fixing weft yarn groups in the manufacture of non-woven fabrics, in which a large number of yarn groups are arranged perpendicular to the warp and warp, and the yarn groups in the warp and warp are fixed by adhesive, in the process of running a large number of yarns arranged at regular intervals, A polymer liquid with high performance and stringiness is discharged in a linear form, and the linear polymer liquid is scattered with air, reaches the thread group and adheres to it, solidifies the adhesive filament, and forms the first filament.
The arrangement of the yarn groups is fixed by the ment to form a weft web,
Separately, a large number of yarns are warped in a shape that intersects with the warp web, and the weft web is cut into lengths that approximately correspond to the warp width and laminated with the warp web, and then the warp web is glued. This also made it possible to produce a nonwoven fabric with orthogonal warp/warp directions.

As a result of experiments, it has been found that one of the most suitable methods is to use a hot melt adhesive as the polymer liquid. It is already known in the hot melt adhesive industry to scatter hot melt adhesive into filaments with air and attach it to an object, and devices for this purpose are commercially available, and are applied to diapers and cardboard. Spraying intermittently has already been done.

The present invention utilizes these hot melt spray systems to
We discovered that it can be applied to fixing the arrangement of a large number of thread groups,
Furthermore, this group of many threads with a fixed arrangement has a weft and weft area of N8!
It was found that it was highly effective when used as a weft group. Hot melt adhesive melt is the most suitable because it has good adhesion and workability, but even polymers that are not called hot melt adhesives can be used as long as they are stringable and have a certain degree of adhesive properties. It can be used.

Various methods can be used to spray the polymer melt into filaments. For example, one method used in the hot melt adhesive industry is to spray several filaments around the spinneret. There is a method of providing air holes and scattering the spun filament-like melt with air.

The present invention utilizes this method to fix the filament arrangement. Furthermore, by colliding with air so that the main component of the ejected and scattered filaments is in the direction perpendicular to the running direction of the running yarn group and in the horizontal direction, and by adjusting the scattering angle, a small amount of adhesive filament can be used. You can effectively fix the array.

This means that fewer spray guns are required,
Equipment costs are lower, and the gun is easier to adjust during operation. Since the air is heated air, the filament scatters more uniformly and the distance it scatters becomes wider. If the temperature of the air is lower than the melting point of the adhesive polymer, the viscosity of the polymer liquid will increase, making it insufficient to thin the filament by drafting, and the width of the scattered filament will be uneven, making it difficult to thin the filament with medium thickness. The distribution of will also be uneven. When scattering filaments is carried out using a method that produces random nonwoven fabrics, the line is running at high speed, so the scattered filaments tend to be arranged in the line direction (vertical direction), and the number of components between the threads increases. The number of filaments that can be connected is small, so it is not efficient as a method for fixing the arrangement of threads.

If the raw material yarn of the product to be laminated has already been coated with adhesive, or if a later adhesive such as emulsion adhesive is used, the product will be more suitable for the purpose, and hot melt adhesive will get in the way. In some cases, spraying hot melt can be achieved using the method of the present invention as a means of fixing only the thread alignment and preventing it from entering the product.

In other words, when using a weft/warp stacking machine to cut a running weft group into lengths that approximately correspond to the warp width and stack them with the warp web,
By ensuring that the injected adhesive filaments are applied only to the beginning and the last end of the weft web being cut, the arrangement of the individual threads is maintained without disturbance. In such a state that the web is in order, the history fJtl'+! Then, if the raw material thread is bonded with its own adhesive ability through heat treatment, or if necessary, emulsion bonding or other adhesive is applied, and the hot melt adhering to both ends of the product is trimmed. It is possible to manufacture the desired product.

The yarn with fixed arrangement used in the present invention includes:
Flat yarns and monofilaments such as regular polyolefin, polyamide, and polyester, multifilaments and spun yarns of polypropylene, polyester, nylon, vinylon, and acrylic fibers, as well as inorganic materials such as glass yarns, carbon fibers, multifilaments, and rovings! aI&I can also be used. After the yarns are orthogonally crossed, the ability of the yarns to adhere to themselves makes the intermittent spray method of the present invention effective. For example, LDP is applied to the surface of HDPE flat yarn.
This is the case when EFI is present, or when adhesive fabric is blended with spun yarn such as polypropylene or polyester.

The sprayed polymer used in the present invention may be EVA-based, polyamide-based, polyester-based, etc., which are used as hot melt adhesives, as long as they have stringability and adhesive ability, depending on the use and purpose of the product. be selected as appropriate. In addition to hot melt adhesives, it is also possible to use wax alone, or polymers such as polyolefin, polyester, or polyamide, or materials based on them, as long as they can be bonded to the yarn whose alignment is to be fixed. .

Explanation with 68 drawings The method of the present invention will be explained with reference to the drawings.

FIG. 1 is a process diagram showing an example of the present invention, in which 1 is a group of running threads, and a polymer melt 3 discharged from spray guns 2a, 2b, . . . is shaped into filaments by air (not shown). A filament web 4 is formed in which the filaments are mainly attached to the traveling yarn group so as to be arranged horizontally and coagulated. Gun 2a, 2b・
. . are arranged in two or more rows as shown in FIG. 1 to eliminate mutual interference of air. The position of this gun is movable from side to side, so that the overlap distances of the horizontally arranged filament webs that are sprayed can be adjusted relative to each other. At that stage, the scattered filament web 4 does not necessarily need to be firmly adhered to the yarn group;
They may be bonded by heating or the like in a later process.

FIG. 2 shows an example of a spray gun 2a that scatters polymer. The spinneret 5 is connected to the needle 6 by a signal as necessary.
It can be opened and closed. Around the spinneret 5, there are a plurality of air holes 8a and 8b on the inside that serve to twist the ejected filament 7 (all of them are not shown to avoid complication), and on the outside that serve to twist the filament 7 and scatter the filament. There are air holes 9a and 9b (all of which are not shown) that serve to The air from the outer air holes 9a and 9b collides, and the filaments scattered thereby spread in a direction perpendicular to the plane of the paper, and spread in a direction perpendicular to the traveling direction of the thread group 10 running downward.

FIG. 3 shows an example of warp and warp lamination using a warp and warp laminating machine, and the weft web lla conveyed from the weft direction has portions to which adhesive filaments 13 are applied at intervals exactly corresponding to the width of the warp web 12.

The center portion of the bonded filament 13 is cut with a rod-shaped heat cutter 14, and the filaments 13 are laminated one after another in a manner perpendicular to the vertical web 12. The horizontal webs llb, llc, etc. stacked on the vertical web 12 are stacked so that the number of laps is as small as possible. If the horizontal yarn is glass yarn and cannot be cut with a heat cutter, it will be cut with a razor-like cutting edge.

e, Examples Example I HDPE stretched tape (width 2.5 order, 500 denier, the surface of the tape is coated with LDPE) is 3m+
Arrange 400 pieces with a width of about 1200 at a pitch of 40rn/
It is running at min. From above, spray LDPE (Ml, 100 and 200) with four spray guns as shown in Figure 2.
A 1:1 mixture of 0 and 0) was dispersed in the form of filaments with hot air. The resin temperature was 210°C and the hot air temperature was 230°C. When the hot air temperature was lower than 110°C, the dispersion became extremely non-uniform and the spray width became unstable. The filaments that were blown away by air at 230°C were arranged in a horizontal pattern. As shown in Figure 3, the spraying was performed intermittently over a running length of the stretched tape of 1200mm@, and the width of the filament coming out of one spray gun was 320 mm, and the width of the filament was 5 mm in the line direction.
It was 0wnm. The filaments sprayed from each gun are wrapped around each other by 10 to 20 filaments. The filaments protruding from the width of the running stretched tape group of 1200ffIII+ are received by a hot plate heated to 180°C, melted, and guided out of the system. The amount of filament deposited on the tape was 12 grams per square meter. This running tape group is guided as a weft web to a warp and warp laminating machine, and as shown in Figure 3, the part where the filament is attached is cut with a heat cutter, and the same tape group as the weft is used on the warp web. The warp and warp layers were laminated and warp and warp bonded in a heat cylinder at 115° C., and the portions of both ends to which the LDPE filaments were attached were trimmed to obtain a stretched tape warp and warp orthogonal nonwoven fabric.

Example 2 220 polyethylene terephthalate (hereinafter abbreviated as PET) stretched tapes (width 3ffII11, denier 800) with a pitch of 5WIm, 30m/width of 1100mm.
Three spray guns spray PET hot melt (trade name: Harptsu A1200, melting point: 141°C, manufactured by Asahi Kasei Corporation) from above a group of stretched tapes running at a speed of
The filaments are scattered with hot air at 250℃ so that the filaments are lined up horizontally. 35 during filament scattering from one gun
0 +++m, and the widths of 20 to 30 mm are wrapped around each other. The amount of injected filament is 5 per square meter
Gram, and this time I sprayed it all over the place instead of intermittently. This is the history + as a web site! Lead to layer machine, P of sutra
A first group of ET stretching tapes was laminated and bonded on a heat cylinder at 170° C. to form a PET stretched tape orthogonal nonwoven fabric. In the finished product, the weft and weft tapes are arranged in an orderly manner, and despite the small amount of glue, the warp and weft adhere well.

When the temperature of the hot air was lowered to 140°C or less, the spray width decreased and the uneven distribution within the mountain became noticeable.

10 Effects of invention The device becomes cheaper and more compact than the conventional technology.

Since it can be sprayed intermittently, glue can be applied only to the heat-cut portion of the weft web that is heat-cut in the weft and weft laminating machine, making it possible to apply emulsion and products without hot-melt adhesive, which is impossible with conventional methods.

[Brief explanation of the drawing]

FIG. 1 shows an example of a method of scattering filaments onto a group of yarns to fix the arrangement among the yarns. FIG. 2 shows an example of a spray gun used in the present invention. FIG. 3 illustrates a method of cutting the adhesive filament parts intermittently sprayed onto the weft web using a weft and weft H machine to form perpendicular 1*q. Explanation of the main symbols l is a group of running threads. 2a, 2b... are spray guns. 5 is the spindle of the spray gun. 6 is a needle that can block the spinneret. 8a, 8b, 9a, 9b are air holes 11a, llb... are weft webs in which threads are arranged. 12 is a vertical web with arranged threads. 13 is the part to which adhesive filaments arranged horizontally are attached. 14 is a heat cutter. Applicant Polymer Processing Research Institute Co., Ltd.

Claims (5)

[Claims] (1) In the process of running a large number of threads arranged at regular intervals,
A multi-thread arrangement characterized in that a polymer liquid with adhesive ability and spinnability is dispersed with air, arrives at the thread group in the form of filaments, solidifies and adheres, and fixes the arrangement of the thread groups with the filaments. Fixing method. (2) In the method of arranging and fixing a group of weft yarns in the manufacturing of non-woven fabrics, in which a large number of yarn groups are arranged orthogonally to the warp and warp and fixed by adhesive, the bonding ability is achieved in the process in which a large number of yarns are arranged at regular intervals and run. A stringable polymer liquid is dispersed in the form of filaments using air, which reaches the yarn group, where it solidifies and adheres to the yarn group.The filaments fix the arrangement of the yarn group to form a weft web, which then runs in a manner that intersects with this web. A multi-strand yarn group characterized in that a weft web is cut into lengths approximately corresponding to the warp width, laminated orthogonally to the warp web, and the warp webs are bonded to produce a weft orthogonal nonwoven fabric. Array fixing method. (3) The method of arranging and fixing a multi-thread group according to claims (1) and (2), characterized in that the air to be scattered is air heated to a temperature higher than the melting point of the polymer that is the main component of the polymer liquid. (4) In claims (1) and (2), air is collided with and dispersed so that the solidified and bonded filaments are arranged in an arrangement whose main component is a direction perpendicular to the running direction of the running yarn group. A method for fixing the arrangement of a large number of thread groups. (5) In claim (2), when the running weft yarn group is cut into lengths approximately corresponding to the warp width and laminated with the warp web, the first part and the last end of the cut weft web A method for fixing the arrangement of a large number of yarn groups, characterized in that a coagulated and bonded filament is attached to only the weft, and the arrangement of the weft group is fixed at that part.