Production process of nylon 6 crimped yarn

Abstract

This invention relates to a production process for nylon 6 crimped filament, characterized by the following steps: Step 1: Nylon chips are added to a screw extruder, where they are extruded and melted into a molten state, then transported to various spinning boxes via melt pipes; Step 2: A metering pump evenly distributes the melt to each spinning assembly, where it is extruded into a filament bundle by the spinneret. Two crimping heating rods are placed at the spinneret outlet to allow the uncooled filament bundle to coil; Step 3: The filament bundle is then cooled sequentially by a side-blowing system, which is equipped with a controllable and automatically temperature-adjustable heating system to make the side-blowing temperature adjustable. Afterward, it is oiled through an oiling nozzle; Step 4: The oiled filament bundle passes through a channel and is pre-wound by a pre-networker. This invention, through the above process steps, can produce crimped nylon filament, meeting the material requirements of more textile products.

Description

Technical fields:

[0002] This invention relates to a production process for nylon 6-curl yarn. Background technology:

[0004] Nylon 6, also known as glass fiber reinforced polyamide-6, is called Polycaprolactam or glass fiber reinforced. Its Chinese alternative name is caprolactam industrial screen wire. Its CAS number is 25038-54-4, and its molecular formula is C6H13NO. It can be used to make various high-load mechanical parts, electronic and electrical switches and equipment, building and structural materials, and is widely used in the textile industry to manufacture fibers.

[0005] Currently, when nylon 6 is used to make textile fibers, it can only produce straight filaments (as shown in Chinese patents, Production Method of Functional Nylon 6 Fiber, Publication No. CN106381553A, Preparation Method of High-Strength Nylon 6 Masterbatch and Method for Preparing High-Strength Nylon 6 Fiber, Publication No. CN114276676A), but cannot produce crimped filaments. Summary of the Invention:

[0007] In view of the above-mentioned problems, the purpose of this invention is to propose a production process for nylon 6 crimped yarn. This production process for nylon 6 crimped yarn is reasonably designed and is conducive to producing nylon 6 crimped yarn.

[0008] The technical solution of the present invention is as follows:

[0009] A production process for nylon 6-curled yarn, characterized by the following steps:

[0010] Step 1: Add nylon chip raw material to the screw extruder. After passing through the screw extruder, the nylon chip raw material is extruded and melted into a melt, which is then transported to each spinning box through the melt pipeline.

[0011] Step 2: The metering pump evenly distributes the melt to each spinning assembly. The filaments are extruded through the spinneret of the spinning assembly. Two curling heating rods are set at the filament outlet of the spinneret to make the uncooled filaments coil.

[0012] Step 3: The yarn bundle then passes through the side blowing system for cooling. The side blowing system is equipped with a controllable and automatically temperature-adjustable heating system to make the side blowing temperature adjustable. After that, it is oiled through the oiling nozzle.

[0013] Step 4: After the oiled yarn bundle passes through the channel, it is pre-wound by the pre-networker;

[0014] Step 5: The pre-wound yarn bundles are sequentially placed into a cold box and a hot box for stretching and shaping;

[0015] Step 6: After stretching and shaping, the filament bundle is passed through the main networker to increase the network density, and then passes through the guide plate to the winding machine for winding and shaping.

[0016] Preferably, the two curling heating rods are staggered in the upper, lower, front, and rear positions at the spinneret outlet so that the filament bundle passes through the middle of the two curling heating rods and forms rounded corners on the two curling heating rods, thus achieving natural bending of the filament bundle.

[0017] Preferably, the spinning speed is 4300-4800 m / min; the speed of the cold roller in the cold box is 3600-4100 m / min; the speed of the hot roller in the hot box is 4400-4900 m / min; the setting temperature of the hot roller in the hot box is 150-175℃; the stretching ratio of the cold roller in the cold box to the hot roller in the hot box is 1.16-1.26; and the speed of the guide disc is 4300-4800 m / min.

[0018] Preferably, the wind speed of the side-blowing system is 0.55 m / s; the rotation speed of the metering pump is 8 revolutions per minute.

[0019] Preferably, the temperature range of the above-mentioned controllable automatic temperature-regulating heating system is 50-200℃.

[0020] Preferably, a first nitrogen protection device is provided below the spinneret outlet to protect the filament bundle and reduce the contact between the filament bundle and air.

[0021] The present invention can produce nylon yarn with crimp through the above-described process steps, which can meet the material requirements of more textile products. Attached image description:

[0023] The present invention will be further described below with reference to the accompanying drawings;

[0024] Figure 1 This is a block diagram illustrating the working principle of the present invention;

[0025] Figure 2 This is a schematic diagram showing the relative positions of the two coiled heating rods;

[0026] Figure 3 These are the performance parameters of nylon 6 crimped yarn produced by the production process of this invention;

[0027] Figure 4 This is a photo size reference of nylon 6 coil yarn produced by the manufacturing process of this invention;

[0028] Figure 5 These are photos of existing 6-spindle nylon yarn;

[0029] Figure 6 This is a photograph of multiple 6-curled nylon yarns produced by the manufacturing process of this invention. Detailed implementation method:

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] Implementation, for example Figure 1 As shown, a production process for nylon 6 crimped yarn includes the following steps:

[0033] Step 1: Add nylon chip raw material to the screw extruder. The nylon chip raw material (or recycled chip raw material) is extruded and melted into a melt after passing through the screw extruder, and then transported to each spinning box through the melt pipeline; the spinning speed is 4300-4800m / min.

[0034] Step 2: The metering pump evenly distributes the melt to each spinning assembly (the metering pump speed is 8-20 rpm). The filaments are extruded through the spinneret of the spinning assembly. Two curling heating rods are set at the filament outlet of the spinneret to make the uncooled filaments coil.

[0035] Step 3: The yarn bundle is then cooled by the side blowing system. The side blowing system is equipped with a controllable and automatically temperature-adjustable heating system to make the side blowing temperature adjustable (the temperature range of the controllable and automatically temperature-adjustable heating system is 50-200℃, and the wind speed of the side blowing system is 0.40-0.60m / s). After that, it is oiled by the oiling nozzle.

[0036] Step 4: After the oiled yarn bundle passes through the channel, it is pre-wound by the pre-networker;

[0037] Step 5: The pre-wound yarn bundle is sequentially fed into a cold box and a hot box for stretching and shaping; the speed of the cold roller in the cold box is 3600-4100 m / min; the speed of the hot roller in the hot box is 4400-4900 m / min; the shaping temperature of the hot roller in the hot box is 150-175℃; and the stretching ratio of the cold roller in the cold box to the hot roller in the hot box is 1.16-1.26.

[0038] Step 6: After stretching and shaping, the filament bundle is passed through the main networker to increase its network density, and then through the guide spool to the winding machine for winding. The speed of the guide spool is 4300-4800 m / min.

[0039] To better achieve filament winding, the two curling heating rods mentioned above are misaligned at the spinneret outlet in terms of their upper, lower, front, and rear positions (e.g., ...). Figure 2As shown), the filament passes between two coiling heating rods A1, and the filament forms rounded corners on the two coiling heating rods, achieving natural bending of the filament. The temperatures of the two coiling heating rods A1 can be the same or different. Preferably, the temperature of the first coiling heating rod is 50-80℃, which keeps the filament at a certain temperature and reduces cooling. The temperature of the second coiling heating rod is 80-150℃, which makes the filament bend quickly under higher temperature, maintaining a higher degree of bending. Using two temperature differences can more effectively increase the range of bending changes of the filament to achieve the bending effect.

[0040] To reduce the contact between the filaments and air and ensure the quality of the finished product, a first nitrogen protection device is installed below the filament outlet of the spinneret to protect the filaments.

[0041] The present invention can produce nylon yarn with crimp through the above-described process steps, which can meet the material requirements of more textile products.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A process for the production of a crimped nylon 6 yarn, characterized in that: It comprises the following steps: Step 1: add nylon chip raw materials into a screw extruder, the nylon chip raw materials are extruded and melted into a melt after passing through the screw extruder, and then are conveyed to various spinning beam bodies through a melt pipeline; Step 2: a metering pump uniformly distributes the melt into various spinning assemblies, and extrudes a filament bundle through a spinneret plate of the spinning assembly, two crimping heating rods are arranged at a filament outlet position of the spinneret plate to make the incomplete cooling filament bundle coil; Step 3: then the filament bundle passes through a side blowing system for cooling, a controllable automatic temperature adjusting heating system is arranged in the side blowing system to make the side blowing temperature adjustable, and then the filament bundle is oiled through an oiling nozzle; Step 4: the oiled filament bundle passes through a duct and is pre-wound by a pre-networker; Step 5: the pre-wound filament bundle enters a cold box and a hot box in sequence for stretching and setting; Step 6: the stretched and set filament bundle passes through a main networker to increase the network degree, and then reaches a winder through a godet to be wound and formed; the two crimping heating rods are staggered at upper, lower, front and rear positions of the filament outlet position of the spinneret plate to make the filament bundle pass through the middle of the two crimping heating rods and form a fillet around the two crimping heating rods to realize natural bending of the filament bundle; the spinning speed is 4300-4800 m / min; the speed of a cold roller in the cold box is 3600-4100 m / min; the speed of a hot roller in the hot box is 4400-4900 m / min, the setting temperature of the hot roller in the hot box is 150-175℃, and the stretching ratio of the cold roller in the cold box and the hot roller in the hot box is 1.16-1.26; the speed of the godet is 4300-4800 m / min; the wind speed of the side blowing system is 0.4-0.6 m / s; the rotating speed of the metering pump is 8-20 r / min; the temperature range of the controllable automatic temperature adjusting heating system is 50-200℃; a first nitrogen protection device is arranged below the filament outlet of the spinneret plate to protect the filament bundle and reduce the contact of the filament bundle with air.

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