KR100431139B1 - string of polyamide fiber and method for producing thereof - Google Patents

Abstract

The present invention relates to a braid of polyamide based fibers which can be usefully applied to bundle braids, in particular wool lumps for raising sheep, and a method for producing the same, wherein the filament yarns of polyamide based fibers are arranged in parallel in multiple strands, respectively. It is formed into a film state by bonding with an adhesive to be firmly connected and then dried under tension, and is twisted under a certain weight, so that there is no stretching and twisting, and it is thinner than a conventional polypropylene fiber. It has high tensile strength and bursting strength and can be applied at a low price. It does not decompose by heat or light even after long-term use, and its durability is excellent. Above all, it has excellent dyeing affinity with acid dyes. It does not cause dyeing defect.

Description

String of polyamide fiber and its manufacturing method

The present invention relates to a string of polyamide fibers and a method of manufacturing the same, more particularly, to a string of polyamide fibers and a method of manufacturing the same, which are particularly useful for bundling wool lumps for wool breeding because of their high toughness, light fastness and durability. It is about.

As most of the wool consumed around the world is produced in Australia, Australia promotes the wool industry as the national primary industry, and therefore has the necessary equipment and systems for raising sheep. For example, cultivated grasses are cut and then deposited, and when they are lumps of a certain size, they are immediately tied to the field, so all the farming processes are carried out by a tractor from grass harvesting to storage. The sheep are being fed.

As a string that binds these grass lumps during storage, basically, the grass should not be stretched over time so that the grass is dried and the volume of grass lumps can be preserved as it is first bound, and the tensile strength and tear strength must be large. When tightly tying the bulk of grass together, the rope is not easily torn, so it is easy to work and it must be durable enough to be free from deterioration or deformation even when stored for at least 3 years. .

In addition, the string used in the grass of wool should be excellent in dyeing so that it is easy to separate and collect even if it is mixed with grass or wool due to the characteristics of its use.

However, until now it has not been possible to obtain a string that meets all of the above requirements for binding wool grass. Therefore, polypropylene fiber cords, which are advantageous in many respects, have been generally used rather than natural hemp fiber cords. The polypropylene fiber's cord has a specific gravity of 0.91, which is the lightest, strongest and most easily available among the fibers. Above all, the polypropylene fiber has been mainly used as a material for the cord. Knotting systems have also been manufactured and used to fit the strings of the polyflophylene-based fibers that are spun in a slit or split state to form yarns.

By the way, this polypropylene fiber has the advantages of ultra-high strength and high strength as described above, while the dyeing property, weather resistance and heat resistance is very poor, and it is also vulnerable to decomposition by sunlight. When used for a short time does not lead to a big problem, but when used to bind grass lumps, the strings of these materials are stretched, even if they are tightly tied at first, they will loosen themselves and will not be able to maintain the grass well, and will not be able to function properly. When the light fastness is very weak, after about one year after being tied to the grass, the string of polypropylene fiber is cut and turned into pieces of fragments, and especially colorless and transparent, so these fragments could not be found and recovered.

Furthermore, even if these crumbs were mixed with the collected wool, they could not be screened out, so they had to be made of wool or wool while being mixed with wool fibers. The ingestion of vinegar mixed with sheep causes many problems in the wool industry, including indigestion, and in New Zealand, such as Australia, which mainly focuses on the wool industry, a new material that can replace the polypropylene fibers Developing a string has emerged as an urgent task.

However, developing a cheaper alternative that meets all of the above requirements as a string was not easy.

The present inventors have recognized the above-mentioned problems in the strings for tying a critical grass mass in the wool industry, such as Australia and New Zealand, which have long been engaged in the textile industry, especially the textile industry for industrial materials. In order to develop the strings, the researchers have been working at various angles for many years.

In other words, the present invention is also suitable for the noting system of the tractor currently in use, which is manufactured to tie the grass mass automatically using the polypropylene fiber rope, so that the conventional polypropylene fiber does not need to be replaced. It has almost the same structure as the rope, but has not been elongated, has high strength, and has high daylight fastness and durability, and has made great efforts to provide a new type of rope that does not deteriorate or deform for at least three years after the notting work. As a result, a simple manufacturing method has developed a special structure of the new material of the rope suitable for the notching of the grass mass as described above.

1 is a perspective view schematically showing the overall structure of the polyamide-based fiber string according to the present invention,

FIG. 2 is a schematic diagram showing an enlarged structure of a film, which is an intermediate product for finally producing a braid of the polyamide fiber shown in FIG. 1;

3 is a cross-sectional view of a film that is the intermediate product of FIG. 2,

Figure 4 is a state of use showing the state that the string of the polyamide-based fiber produced by the present invention is applied to a specific example.

※ Explanation of symbols for main parts of drawing

1 film 2 filament yarn

3: adhesive 4: grass lump

4 ': dried grass mass

A: rope according to the present invention

The rope used when tying large grass lumps or bales according to the present invention

It is made of filament yarn of polyamide fiber, which is formed in a film state by bonding with adhesives which are arranged in multiple strands in parallel and are connected in parallel, and are dried under tension, and have a certain weight It is a yarn of polyamide fiber, which is twisted under the applied state, has no elongation or elongation, has high tensile strength, and is excellent in light fastness and durability.

The string of the polyamide fiber according to the present invention comprises the steps of combining the filament yarns of the polyamide fiber fibers;

Filament yarns each bonded to a predetermined thickness in parallel to each other in a predetermined width, and then applying an adhesive to the space between the filament yarns and fixing them in a sheet form;

Drying the filament yarn fixed in the sheet state under ultra-tension to form a film of polyamide fiber;

It is characterized in that it is produced by the; twisting step of giving a weight to the film of the dried polyamide-based fibers, twisting in a constant direction without stretching.

The film forming process is applied to a system specially provided so that the filament yarn of the polypropylene fiber bonded in the sheet state is preferably cylinder-dried under the precise control of the speed and tension.

As a polyamide fiber which is a main material of the polyamide fiber braid according to the present invention, aramid fiber in which at least 85% or more of nylon (nylon) or amide group consisting of aliphatic monomers are directly connected to an aromatic group may be applied. Among them, nylon 66 filament yarn for tire cords may be most preferably applied.

The adhesive may be a representative polyacrylic resin, polyurethane resin, etc. of the thermoplastic resins, including thermosetting resins, and the oil-based in the place where the rainy season, depending on the weather of the season or country, and the aqueous resin in the place of dry season Is applied, and polyacrylic resin is generally applied.

When described with reference to the accompanying drawings so that the structure of the polyamide-based fiber braid according to the present invention more clearly.

1 is a perspective view schematically showing the string (A) of the polyamide-based fiber according to the present invention, the string (A) is a plurality of nylon filament yarn mainly used for the tire cord is a certain thickness to suit a certain thickness first They are combined to form one strand of filament yarns 2. The filament yarns 2 are then arranged side by side and enlarged as shown in FIGS. 2 and 3, the plate being an intermediate product by an oily or aqueous adhesive 3 applied between the arranged filament yarns 2. It is formed from one sheet-like film 1. That is, an adhesive 3 having a predetermined width is alternately formed between the filament yarns 2 of one strand to form a single thin film 2 (see FIG. 3). The overall width of the thin film 2 is It varies slightly depending on the thickness of the string required, but is formed in about 1 to 2.5 cm.

This film (2) is passed through a drier controlled to a specific tension and temperature through an inclined straight line so that its shape can be well maintained, and is then stretched under the unusual conditions of gravity, thereby shrinking due to twisting. It is formed of a string (A) of one strand of polyamide fiber twisted in a certain direction without.

The temperature at the time of drying is about 110 ~ 180 ℃, when the temperature is lower than the lower limit, the adhesive strength is low, so that the filament yarn (2) is separated from each other can not be produced on the film (1), if the temperature exceeds the upper limit Since the filament yarn 2 or the adhesive 3 may be thermally decomposed, the filament yarn 2 or the adhesive 3 should be treated within the above range in consideration of the melting point of the adhesive and the polyamide fiber and the processing facility.

In addition, as shown by the solid line in Figure 4, the string (A) is not stretched even if the grass lump (4) is tightened to a degree that can shrink and shrink during drying, moreover, even after a time melting point and transition Unlike the low temperature polypropylene-based braid, it is not cut by elongation due to sunlight or oxygen in the air or by deterioration or by cutting the braid. As shown by the dotted line of FIG. 4, the grass is dried and the volume of the mass is considerably reduced. Even the string (A) is loosened and is present as it is bundled without first peeling off.

In order to more easily understand the characteristics of the cord of the polyamide fiber according to the present invention and a method for producing the same, the following examples are described by way of example, but the examples are only for the purpose of understanding the present invention and the spirit of the present invention. And it will be readily understood by those skilled in the art that modifications and variations are possible within the scope of the claims.

Example

34 strands of nylon 66 filament yarn for 1260D tire cords formed by polycondensation of hexamethylenediamine and adipic acid were combined.

The combined filament yarns are simultaneously introduced into a stepped film forming apparatus having a partition space of a predetermined width, and the parallel filament yarns are parallelly spaced in the partition space, and the parallel filament yarns are made of an oil-based polyacrylic resin. After immersion in the solution, the surface of the surface was squeezed by passing through a manglow. As a result, the adhesive deposited on the upper surface of the nylon 66 filament yarn was wiped off to form a 2 cm wide sheet of sheet, with the adhesive remaining only between the filament yarns. A cylinder with a continuously variable transmission in which the tension is given at the introduction of nylon 66 at the inlet portion, with attention given at a temperature of 130 ° C. through an inclined straight line so that the sheet can be kept in film form without cracking. After drying through, a high pressure calender roller adjusted slightly below the tension of the inlet was passed to obtain a film of the intended polyamide based fiber.

This produced film is introduced into a ring-twister equipped with a traveller, and is applied to Z-roll while applying a constant gravity to increase the inertia so that the shrinkage caused by twisting becomes zero (0). It was.

The film-shaped polyamide-based fiber yarn manufactured so as not to be stretched is wound into a cone in a known manner so that the yarn layer does not collapse, and then finished by setting the spacing between the yarn and the yarn to be constant. After dyeing with a dye, washed with water and dried.

Ten ropes of the existing polypropylene fiber of the same fineness and the same fineness formed in accordance with the present embodiment were prepared for each 10m by 1m, and the tensile strength was tested for 10 times. On the other hand, the strap of the polyamide fiber formed according to the present embodiment was 129 kgf, and it was confirmed that the tensile strength was much higher than 135 kgf.

In addition, when the braid formed according to the present embodiment was left at room temperature for 13 months, it had excellent daylight fastness, no degradation by sunlight, and excellent microbial and chemical resistance.

As described above, the string of the polyamide fiber according to the present invention is not stretched or shrunk, and has excellent daylight fastness and weather resistance, and thus there is no deterioration or deformation. In particular, even if the thickness of the polypropylene fiber is thinner than that of the conventional polypropylene fiber, the tensile strength and rupture It is excellent in strength, and can be applied at a low price rather than the low-cost polypropylene fiber based on weight, and has excellent dyeing affinity, so that color fastness can be excellently dyed to a desired color for a long time without discoloration. Can be used.

Moreover, even if mixed between grasses and wool fibers, it can be detected and detected quickly, so there is no concern for the sheep to eat and at the same time prevent the defects of wool products in the West, even if they are mixed between the wool fibers. As it has good affinity with acid dyes like wool, it does not cause dyeing defects, but also has the advantage that it can be mixed in wool to enhance their concentration, so that it can completely solve the existing damage caused by the shavings of the cord. do.

In addition, the cord of the polyamide fiber according to the present invention can be applied as it is without changing the equipment of the existing notching mechanism equipped to be suitable for the use of the cord of the slit / split-shaped polypropylene fiber. It is excellent, and can be recovered and regenerated by a regeneration bowl or an automobile bumper, so that the polypropylene fiber rope is not recyclable, and thus there is no waste to contaminate soil and air during disposal.

Moreover, the string of polypropylene fiber used in farm crops in rural areas is decomposed and broken well at room temperature, causing fatal injury when the animals such as chickens are unaware and ingested. On the contrary, the string of the polyamide fiber according to the present invention is durable and durable, and has excellent light fastness and dye fastness, so there is no such concern at all. Therefore, when applied to not only the storage of wool grasses, but also as a vinyl house in farming and fishing villages, or a rope for general goods, there is no difficulty in preventing environmental pollution and colorless recovery, and it is renewable and has excellent characteristics such as high strength and light fastness. In this regard, it is expected that the present invention can obtain an excellent effect as much as a revolution in the cord when it is used as an industrial cord in the future instead of the cord made of polypropylene-based fiber which is commonly used until now.

Claims (4)

In the string which is used to tie a grass lump or a bale for wool, It is made of filament yarn of polyamide-based fiber, the filament yarn of the polyamide-based fiber is formed in a film state by bonding with an adhesive which is arranged in multiple strands in parallel and firmly connected therebetween, and then the film is dried under tension. A yarn of polyamide fiber, which is formed by being twisted under a predetermined weight, and is formed of a film structure having excellent light fastness and durability without stretching and twisting. The cord of polyamide based fiber according to claim 1, wherein the filament yarn of the polyamide based fiber is nylon 66 for a tire cord. 2. The string of polyamide based fibers according to claim 1, wherein the adhesive is a polyacrylic resin. In the production method of the rope having excellent high-strength daylight fastness without the spasm and elongation used to bundle wool grass or bales, A step of joining several strands of filament yarn of a polyamide fiber; Arranging the filament yarns of the polyamide-based fibers respectively bonded to a certain thickness in parallel to each other in a predetermined width, and then applying an adhesive to the space between the filament yarns and fixing them in a flat sheet state; Drying the filament yarn fixed in the sheet state under ultra-tension to form a film of polyamide fiber; A method of producing a polyamide fiber braid, comprising: a twisting step of twisting in a predetermined direction without being stretched while adding weight to a film of dried polyamide fiber.