JPS5939539B2 - Method for manufacturing jetted filament weft parallel bodies using centrifugal spinning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a method for producing a parallel weft filament body in which jetted filaments produced by centrifugal spinning are arranged in a uniform width as weft filaments, and selvedges are attached to the ends of the weft filaments. Patent application No. 107037/1983, which is the prior invention of
This invention is an improvement on the method for producing a weft-parallel body of jet filaments by centrifugal spinning.

In order to collect polymer filaments ejected by centrifugal force from the spinneret of a spinning head that rotates at high speed, the present application provides a collecting surface for the ejected polymer filaments concentrically with respect to the spinning head, and a part of the surface has adhesive ability. The selvage material moves along the collection surface as the selvage material adhesive part, and a part of the ejected filament is adhered and collected to the selvage material, and the remaining part of the collection surface is used as a collection surface that collects the remaining ejected filament. The collected ejected filaments are sequentially separated from the collecting surface by the guide of the moving selvedges, and then this is flattened to collect a latitudinal parallel body of ejected filaments with transverse selvedges at the selvage ends. The present invention relates to a method for producing a weft-parallel body of ejected filaments by a centrifugal spinning method, characterized in that the collecting section is constructed with a fixed wetted wall surface sufficiently moistened with liquid. In the method of the previous application, the filaments injected from the spinneret of the spinneret rotating at high speed are collected on a plurality of circulating belts arranged in a concentric circle, and the glued selvedge material is used as a guide to take it off. However, as mentioned above, in the present application, the complicated structure of the circulation belt of the previous application is eliminated, and the jet filament is sprayed on a fixed wet wall surface sufficiently moistened with liquid, which has a simple structure. In either case, whether it is relatively low-speed spinning of thick denier filaments or high-speed spinning of fine denier filaments, the use of the above-mentioned fixed leakage wall surface promotes cooling and solidification of the ejected filament, and the cylinder This makes it possible to reliably inscribe and wind up a shaped or similar cylindrical surface.

The product produced by the method of the present application, like the product produced by the method of the previous application, has only a selvedge material, and is generally made of a jet filament that has been collected in a circular shape and is flattened into two layers without being cut and developed, or is made by cutting and developing the ejected filament in a circular shape. It consists of a plurality of flat plates of fixed width, each of which is a weft parallel body of filaments whose selvage ends are fixed by adhesive with selvage material, and there are no warp threads in the middle. It is not attached.

These products may be used as is for various purposes, but in many cases they are laterally stretched and further heat-set to create weft filaments with high strength and high thermal stability. It can be used as a parallel body for various purposes. The method of the present application can be effectively applied regardless of the spinning speed of the ejected filament by centrifugal spinning.

When the spinning speed is high, filaments with a high degree of molecular orientation are obtained, as is known, and when the spinning speed is low, filaments with a low degree of molecular orientation or no orientation at all are obtained. In either case, filaments with good physical properties can be obtained by carrying out post-stretching in the transverse direction if necessary, and by appropriately selecting the stretching ratio.
Generally, when a thick denier filament is required, it is preferable to spin the filament at a relatively low speed from a thick spinneret and to apply a higher degree of post-stretching. In the case of fine denier filaments, high-speed spinning is advantageous, and if post-stretching is added to this,
A filament with further improved physical properties can be obtained. In the case of low-speed spinning, the spun filaments generally reach the collecting surface with insufficient orientation or no orientation at all, and with insufficient cooling and incomplete solidification. At this time, the adhesion to the ear material is good, but because the cooling and solidification of the collection part has not been completed completely, it is possible that the collection part will stick or the filaments will adhere to each other, making it unsafe. Operation is difficult. In the method of the present invention, since the collection part is composed of a wet wall surface sufficiently moistened with liquid, the filament is completely cooled and solidified by contact with this liquid, and also the friction of the wet wall surface Since the filaments are captured by the action of resistance and surface tension of the liquid, it is possible to minimize the ejected filaments from being dragged by the rotation of the spinning head. In the case of high-speed spinning, the degree of molecular orientation is generally improved as mentioned above, but especially when spinning fine denier filaments, the time required for the filaments to reach the collecting wall is higher than when spinning thick denier filaments as described above. Although cooling is often performed, it is still not perfect. Even if the cooling is insufficient, the adhesiveness of the surface is reduced due to the improvement in the degree of molecular orientation. At the adhesive part of the selvage material, measures such as preheating the selvage material or further crimping the sprayed filament to the selvage material may be taken. However, in the collection section constituted by the leaky wall surface, cooling is performed more completely and the ejected filaments are also captured in the same manner as in the case of the above-mentioned low-speed spinning. However, during high-speed spinning, the spinning head rotates at such a high speed that the high-speed rotation often creates turbulence in the atmosphere around the rotating spinning head, and especially when spinning fine denier yarn, the air around the spinning head becomes violent. This disturbs the filament, making it difficult for the ejected filament to reach the collecting surface smoothly, resulting in a so-called cotton candy-like appearance.

In order to prevent such a situation, we have taken measures to extremely reduce the occurrence of the above-mentioned turbulence, and as a means to guide the ejected filament smoothly to the collecting wall surface, for example, we have introduced a method that allows the ejected filament to reach the collecting surface of the wet wall first. A suction unit is provided at a close distance to the collection position, and even if some turbulence occurs in the surrounding atmosphere, this suction can be achieved by sucking it into the suction unit along with the liquid that moistens the wet wall surface. With the help of the rectifying effect, the ejected filament can reach the wet wall surface without disturbance. The method of the present application is characterized in that the collection section for the ejected filament is composed of a fixed wetted wall surface, and its structure is very different from that of the collection section using the circulating belt system used in the method of the earlier application. Although this method is simple, on the other hand, according to the circulation belt method, each time the ejected filament is collected by the circulation belt, the belt moves, and the attached warp thread moves away from the filament's ejection destination position. Unlike the above, in the case of a fixed wetted wall surface that is used as a wet wall, the leaky wall surface does not move. Therefore, as the attached ear material moves, the ejected filament can be easily moved from the ejected arrival position on the collecting part. It takes. One example of this is to increase the amount of fluid and use its flowing down action to help move the ejected filament, and the above-mentioned rectifying intake section can also be effectively used for this purpose. That is, when a suction section is provided at a close distance to the ejection collection position of the ejected filament and the liquid on the wet wall surface as well as the atmosphere in the vicinity is sucked together, the ejected filament can be reliably moved away from the above-mentioned ejection position. After this, it is taken up with the guidance of the warp thread. The shape of the fixed wetted wall surface is generally short cylindrical, but a similar cylindrical shape with a funnel-like opening at the top or bottom can also be used.

In the case of a funnel shape, in addition to the conical shape, a part of the rotational curved surface is generally used. For example, a part of a rotational quadratic surface, ie, a crested hemisphere surface, a part of a rotational hyperbola surface, etc. is used. The structure of the fixed wetted wall surface may be one covered with hydrophilic fabric so that liquid flows down the surface, or one in which liquid seeps from the back of the fabric to the surface and sufficiently moistens the surface. is preferred. It is also suitable to use a metal surface or a fine mesh surface having countless micropores so that the liquid oozes out from the surface or allows the liquid to flow down on the surface. Next, it is preferable that the above-mentioned rectifying air intake section be provided with a slit-like or mesh-like suction prevention device to prevent the ejected filament from being sucked in.

In general, care must be taken to prevent the selvedge bonding area from getting wet with the cooling liquid. This improves the adhesion of the jetted filament to the selvage material, and can also be used with hot melt adhesives, especially when it is necessary to preheat the selp material to improve its adhesion, especially during high-speed spinning. When using a coated selvage material, the selvage adhesive portion must be kept from coming into contact with the cooling liquid in order to be preheated. Next, I will explain the transauricular material. As the selvage material, generally a plurality of threads glued with hot-melt adhesive, a narrow tape, etc. are used. Generally, the above-mentioned hot melt adhesive is used as the adhesive, but other fast-drying or quick-curing adhesives may also be used depending on the application of the weft filament parallel body of the product. In either case, the most suitable adhesive material is selected depending on the type of raw material polymer of the injection filament. The most commonly used glue is a hot melt glue mainly made of ethylene-vinyl acetate copolymer, but other types of hot melt glue include polyester hot melt glue, polyamide hot melt glue, In addition, polyurethane-based materials are also used. These are appropriately selected from commercially available products and used as required.
In addition, polymers of the same type as the injection filaments with a low molecular weight or a low melting point are sometimes used. Regarding the placement position of the selvage material on the collection surface, the most frequently used positions are two symmetrical positions with respect to the center line of the rotation axis of the spinning head, that is, two positions at both ends of the perpendicular direction of the collection surface. At this point, the ejected filament collected in a circular shape on the collecting surface is spread to the left and right using the two sets of left and right warp threads placed at the above positions as guides, and finally becomes a two-ply flat plate. The circular jet filament on the collecting surface is cut open and expanded by taking it off, or the left and right ears are divided into two, respectively, and then taken off as two flat plates.

Or, by increasing the number of selvage materials, for example, arrange four sets of selvage materials at equal intervals, cut them open at those positions, divide them into quarters, and take them off as four flat plates each having selvage materials at both ends. You can also do it.
Generally speaking, the direction in which the jetted filament weft parallel body is taken up is such that the rotational axis of the spinning head, which rotates at high speed, is arranged perpendicular to the horizontal plane, and the jetted filament collection position is set horizontally, and the product weft parallel body is drawn downward from this position. It is normal to take it up at the top, but there are some cases where it is more advantageous to take it up.

The weight per unit area of the weft parallel body of jetted filaments of the product is determined by the amount of filament jetted per unit time and the take-up speed of the warp yarn, that is, the take-up speed of the weft parallel body.

Furthermore, when the product produced by the method of the present application is subjected to secondary horizontal stretching to produce a product with even higher strength, the area weight decreases in accordance with the stretching ratio. The most important use of the weft-parallel product produced by the method of the present application is to stretch the single filament in the transverse direction as necessary to increase the strength of the single filament. It can be used as a reinforcing material for various film sheets, non-woven fabrics, etc. by laminating it with thick warp filament parallel bodies, etc., or it can be used as a laminate itself with appropriate weight in the warp and weft directions for various packaging materials and bags. For example, it can be used as a material.

In addition, the weft parallel bodies may be used as they are or in a stack of several sheets to reinforce commercially available papers, membranes, nonwoven fabrics such as random webs, etc., when strength in the weft direction is particularly required. In almost all cases when producing such products, it is necessary to heat-set the weft parallel body of the product or its transversely stretched product to improve its dimensional stability. The raw material polymer for the injection filament used in the present method is mainly a thermoplastic polymer, and in particular, a polymer having fiber-forming ability, such as linear polyolefins such as polypropylene and high-density polyethylene, nylon 6 or nylon 66, etc. These include nylons, polyesters such as PET, and polyvinylidene chloride. It can also be applied to the spinning of other polymers such as polyvinyl alcohol, polyacrylonitrile, etc., which are subjected to wet spinning, by using a coagulation bath liquid instead of the cooling liquid. Also, depending on the purpose, a so-called hot melt adhesive may be used as the raw resin. This product is used as a glue material inserted between layers when bonding two sheets together, and has a low basis weight to ensure uniform adhesion. The case of downward take-up will be described below as one embodiment of the method of the present application with reference to the drawings.

FIG. 1 shows a vertical section through the translucent material bonding section, and FIG. 2 shows a horizontal section through the centrifugal spinning section. In Figures 1 and 2, the upper part is supported by a bearing on a hollow shaft 1 fixed to the machine frame.
The filament 7 jetted by centrifugal force from the spinneret 6 of the spinning head 5 attached to a shaft 4 which is rotated at high speed by a belt 3 via a pulley 2 reaches a fixed cylindrical wetted wall surface 8 made of cloth as a collecting section. It is collected by cooling and solidifying. A cooling liquid reservoir 9 is provided in an annular shape behind the wetted wall surface 8, and the cooling liquid is sufficiently supplied to the wetted wall surface through a perforated plate 10 directly behind the wetted wall surface. A slit-shaped intake section 11 is provided at a close distance directly below the position where the jetted filament reaches the wetted wall surface 8, and a negative pressure intake chamber 12 connected to an intake pump is provided immediately behind the slit-shaped intake section 11 to surround the spinning head together with the cooling liquid. The atmosphere is sucked in. The transauricular material 13 having adhesive ability is supplied from above, passes through the transauricular material adhesive part 14 which is sandwiched between the wet wall surfaces 8 on the left and right, and is guided downward. Since there are no holes for the liquid to pass through, the otic material 13 does not get wet or cooled, and the jet filament T adheres to the otic material 13 passing through the section 14, and is guided downward by the otic material. Proceed to.

The weft parallel body 15 of the jetted filaments bonded to the selvedge material is pulled left and right by the cross guiders 16, 16' together with the selvedge material 13, and is passed through the return roller IT, which becomes a two-ply flat plate, to form a two-ply weft parallel body 18. It will be taken over. The supply of molten polymer to the spinning head 5 takes place through a supply pipe 19.

At this time, it is preferable to blow an inert gas into the upper part of the spinning head in order to avoid contact between the molten polymer and the atmosphere. The spinning head 5 is electrically heated from above and below by heaters 20, 20'. The power supply to the lower heater 20' takes place through the fixed hollow shaft 1. Further, if necessary, a guide 21 for the weft parallel body 15 made of a jet filament supported by the fixed hollow shaft 1 can be provided. Alternatively, another selvage material may be inserted inside through the guide tool 21 and removed together with the weft parallel body.
In addition, a heated air pipe 22,
In some cases, heated air is sent through 22' to heat the selvage material, or a heater is provided behind the adhesive portion 13 to heat the selvage material and improve its adhesion.

Example A polypropylene (P.P.) melt for fibers extruded quantitatively from an extruder was heated to a straight diameter 300n maintained at 280°C.
) A short cylindrical wetted wall surface with an inner circumference length of 1540n consisting of a fabric surface with a height of 30mm and cooling water sufficiently permeates into the spinning head with 100 spinnerets on the outer periphery rotating at 2000 rpm. The filament was injected from the spinneret by centrifugal force.

A total of two sets of hot-melt glued selvage material were passed through the selvage material adhesive portions at two symmetrical locations on the short cylinder at a speed of 40 m/min. The selvedge material was made of 7 strands of No. 20 cotton thread glued with a beethylene-vinyl acetate hot melt glue at the recommended pitch, and two threads were arranged at 2 m intervals to form a set. The adhesive part of the ear material, through which the ear material passes, was always kept away from cold water, and hot air was applied from above so that the hot melt adhesive always maintained a suitable adhesiveness.

The ejected filament from the spinning head is cooled and solidified as soon as it reaches the wet wall surface, and then is displaced from the wet wall surface by the negative pressure suction force from the suction slit acting directly below the wet wall surface, and is thermally bonded at the selvedge material bonding part, causing negative pressure. As the glued selvedge material begins to solidify as it is cooled by the intake air from the suction section, the filament attached to the annular negative pressure suction section is peeled off, and the annular parallel body of ejected filaments is moved downward. As it tightens, use a cross guider to pull the translucent material from side to side to flatten it 2.
I picked them up in piles.

Next, the ends of both ears were placed in a grip tenter, stretched 4 times in the transverse direction under hot air heating, and then heat-set. The length of the filament between the ends was 2700 m, the thickness of the filament was 10 denier, and the strength was 4.0 to 5. .0θ/d) A latitude parallel body with an elongation of 25-30% was obtained. The fabric weight of the weft parallel body was approximately 11 y/m” when stretched in the weft direction. At this time, both edge ends of the two-ply weft parallel body that had been taken were further machine-sewn from above each ear material. By doing so, it was possible to perform smooth operations during the later horizontal stretching.

[Brief explanation of drawings]

FIGS. 1 and 2 show one embodiment of the method of the present application, and the first
The figure shows a vertical longitudinal cross-section passing through the translucent material bonding part, and FIG. 2 shows a horizontal cross-section of the centrifugal spinning part.

Claims (1)

[Claims] 1. In order to collect polymer filaments injected by centrifugal force from the spinneret of a spinning head that rotates at high speed, a collecting surface for the injected polymer filaments is provided concentrically with respect to the spinning head, and a part of the surface is formed by a wire having adhesive ability. The selvedge material moves along the collection surface as an selvedge adhesive part, and a part of the ejected filament is adhered and collected to the selvage material, and the remaining part of the collection surface is used as a collection part to collect the remaining ejected filament. The collected ejected filaments are sequentially separated from the collecting surface by the guide of the moving selvedges, and then this is flattened to collect a latitudinal parallel body of ejected filaments with transverse selvedges at the selvage ends. 2. A method for producing a weft-parallel body of ejected filaments by a centrifugal spinning method, characterized in that the collecting section is constituted by a fixed wet wall surface sufficiently moistened with liquid. Method 3 for producing a parallel body of jet filaments by centrifugal spinning, characterized in that the collection surface is cylindrical. In the method according to claim 1, the collection surface is a funnel-shaped surface. A method for producing a weft parallel body of jet filaments using a centrifugal spinning method characterized by