CN114855322B - A kind of ultra-high temperature resistant untwisted sewing thread, preparation device and preparation method - Google Patents

Abstract

The ultrahigh-temperature-resistant untwisted sewing thread comprises a high-temperature-resistant untwisted filament fiber bundle and a low-melting-point filling package, wherein the outside of the high-temperature-resistant untwisted filament fiber bundle is coated by the low-melting-point filling package, the gap between the outer circumference of the high-temperature-resistant untwisted filament fiber bundle is filled by the low-melting-point filling package, and the outside of the low-melting-point filling package is a pulp coating layer. The sewing thread is required to be combined with manufacturing equipment thereof to be sequentially carried out: the sewing thread is manufactured by the steps of untwisting, winding, bundling, wrapping, low-temperature melting and shaping, sizing, drying and winding.

Description

A kind of ultra-high temperature resistant untwisted sewing thread, preparation device and preparation method

technical field

The invention relates to an ultra-high temperature resistant untwisted sewing thread, a preparation device and a preparation method, which are specifically suitable for improving the strength and wear resistance of the sewing thread under ultra-high temperature conditions.

Background technique

High temperature resistant inorganic fibers have unique application advantages in the extreme environmental conditions of aerospace. High-performance basalt fiber can be applied in the environment of 500 ℃, quartz fiber can be applied in the environment of 800 ℃, and ultra-high temperature resistant fibers such as alumina fiber, silicon carbide fiber, silicon nitride fiber, boron carbide fiber and other ceramic fibers It can serve in the environment of 1200 ℃ and above. The high-temperature-resistant inorganic fiber fabric is stitched and assembled with high-temperature-resistant sewing thread to form a three-dimensional ultra-high-temperature heat-resistant thermal protection system with a very low thermal conductivity, which can prevent heat transfer and protect internal precision components during ultra-high-speed flight of aerospace vehicles.

Currently existing sewing thread patents such as: CN 112411006 A discloses a high-temperature-resistant alumina continuous fiber braided sewing thread and its preparation method, etc., all adopt the method of twisting alumina fibers to obtain core materials. Since alumina fiber is a brittle ceramic material, the twisting process will reduce the strength of alumina fiber sewing thread, and the greater the twist, the lower the strength.

In addition, the current equipment for manufacturing sewing thread is common equipment used for common fibers, which have the disadvantages of being easy to break and wear for high-performance ultra-high temperature resistant fibers with poor bending resistance and poor wear resistance.

Therefore, how to prepare an ultra-high temperature resistant untwisted sewing thread with good wear resistance and design a special equipment for preparing high-performance ultra-high temperature resistant fiber sewing thread is an urgent need to solve the strength loss caused by the twisting process. technical problem.

Contents of the invention

The purpose of the present invention is to overcome the problem of strength loss of high temperature resistant sewing thread in the prior art, and provide a super high temperature resistant untwisted sewing thread with high strength and high wear resistance, a preparation device and a preparation method.

For realizing above object, technical solution of the present invention is:

An ultra-high temperature resistant untwisted sewing thread, the untwisted sewing thread comprises: a high temperature resistant untwisted filament fiber bundle and a low-melting point filling bag, and the outside of the high temperature resistant untwisted filament fiber bundle is covered by a low melting point filling The outer circumferential gap of the high-temperature-resistant untwisted filament fiber bundle is filled with a low-melting point filler, and the outside of the low-melt filler is a slurry layer.

The high-temperature-resistant untwisted filament fiber bundle is made of one or more high-performance ultra-high-temperature-resistant fiber filaments among alumina fibers, silicon carbide fibers, silicon nitride fibers, and boron carbide fibers. Ultra-high temperature fiber filaments are high-performance fibers that can withstand temperatures above 1000°C;

The low-melting point filling package is formed by melting one or two of low-melting point polyamide fibers, polyester fibers, polyethylene fibers, and polypropylene fibers. The low-melting point fibers are thin and thin Fiber with a degree of 20D-300D.

A preparation device for ultra-high temperature resistant untwisted sewing thread, comprising: untwisted unwinding device, wrapping device, melt molding device, sizing device, drying device and winding device, the untwisted unwinding device and wrapping The device is coaxially arranged, and a wrapping device is arranged below the untwisted unwinding device, and the wrapping device, low-temperature melting device, sizing device, drying device and winding device are arranged horizontally in sequence along one direction, and the Guide wheels are all arranged between the wrapping device, the melt forming device, the sizing device, the drying device and the coiling device.

The wrapping device 4 includes two to four groups of wrapping rotors rotating along the circumference, and the upper and lower adjacent two groups of wrapping rotors rotate in opposite directions. The melting and molding device includes a low-temperature melting device and a cooling and shaping device. The cooling and sizing device is set facing the outlet end of the low-temperature melting device; the sizing device includes a sizing container and two sizing guide wheels arranged in it, and a heating sheet is provided at the bottom of the sizing container.

The low-temperature melting device is a hollow ceramic heating device, and the cooling and shaping device is air-cooled cooling equipment.

A method for preparing ultra-high temperature resistant untwisted sewing thread, the preparation method is based on a preparation device for ultra-high temperature resistant untwisted sewing thread:

The preparation method of described untwisted sewing thread comprises the steps:

Step 1: Collect the untwisted ultra-high temperature resistant fiber into bundles: pass the ultra-high temperature resistant fiber through the untwisted unwinding device, and remove the low twist of the package fiber by means of active detwisting, so that it enters in the untwisted state wrapping device;

Step 2 Wrap the untwisted fiber bundle through the wrapping device: inside the cylindrical wrapping device, wrap the rayon with low melting point on the high temperature resistant On untwisted filament fibers;

Step 3: pass the wrapped fiber bundle through the low-temperature melting device: the product of step 2 is set at the temperature of the low-temperature melting device so that the rayon with a low melting point is fully melted and entangled, so as to bond with each other and fix the high-temperature-resistant untwisted length of the core layer. Silk fiber, at this time, a low-melting point filling package is formed to wrap the high-temperature resistant untwisted filament fiber bundle;

Step 4: pass the above fiber bundles through the sizing device: sizing the product of step 3 in the sizing device, soaking the surface with the sizing agent, then drying the sizing agent in the drying device, and then winding it on the winding device to form a At this time, the preparation of ultra-high temperature resistant untwisted sewing thread is completed.

The active detwisting method in the step 1 refers to unwinding multiple groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 0.5-2m/min.

The rotating speed of the wrapped rotor in the step 2 is 500-5000r/min.

The temperature of the low-temperature melting device in the step 3 is 60-120° C., and the heating time is 5-35 seconds.

The temperature of the sizing agent in the step 4 is 35-90° C., and the sizing agent is one or both of paraffin wax emulsion, polytetrafluoroethylene emulsion, polyvinyl alcohol emulsion and polyethylene glycol emulsion.

Compared with prior art, the beneficial effect of the present invention is:

1. In the ultra-high temperature resistant untwisted sewing thread of the present invention, the high temperature resistant untwisted filament fiber bundle adopts the untwisted process, which avoids the damage caused by the existing twisting process to the brittle high temperature resistant fiber compared with the traditional high temperature resistant sewing thread. At the same time, a low-melting-point filling package obtained by melting low-melting-point fibers is placed on the outside of the untwisted fiber bundle, which not only plays a role in shaping the outside of the sewing thread, but also protects its internal high-temperature-resistant fibers, so that it can be used during the sewing process. It has good wear resistance. When the sewing thread is in an ultra-high temperature environment, the melting and decomposition of the low-melting point filler and the sizing agent on the surface can take away part of the heat and reduce the temperature of the high-temperature-resistant untwisted filament bundle. This optimizes the high temperature resistance of the sewing thread. Therefore, this design adopts the untwisted process and still has good strength and wear resistance under high temperature conditions.

2. In the preparation device of ultra-high temperature resistant untwisted sewing thread of the present invention, the existing twisting and doubling device is improved, and the fiber roll is reversed to make it return to the untwisted state while doubling and forming a bundle, and then sequentially The industrial production of untwisted sewing thread is realized through wrapping device, low-temperature melting device, cooling and setting device, sizing device, drying device and winding device. The processing and manufacturing equipment is simple and reasonable, which can effectively reduce the manufacturing process of sewing thread and improve Productivity. Therefore, the structural design of this design is reasonable, and the production efficiency is effectively improved.

3. The preparation method of an ultra-high temperature resistant untwisted sewing thread of the present invention is carried out sequentially in combination with its manufacturing equipment: untwisted unwinding bundle—wrapping—low temperature melting and shaping—sizing—drying—winding It is manufactured in the following steps, and its manufacturing process design is reasonable to ensure that the core yarn remains untwisted during the entire manufacturing process. The surface of the sewing thread is lubricated; the design of the processing flow is simple, reasonable and practical. Therefore, the manufacturing method flow design of the design is reasonable and practical.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the untwisted sewing thread of the present invention.

Fig. 2 is a schematic structural view of the device for preparing untwisted sewing thread of the present invention.

Fig. 3 is a schematic cross-sectional view of the finished product after wrapping in step 2 in the method for preparing the untwisted sewing thread of the present invention.

In the figure: high temperature resistant untwisted filament fiber bundle 1, low melting point filling package 2, pulp coating layer 21, untwisted unwinding device 3, wrapping device 4, wrapping rotor 41, melting forming device 5, low temperature melting device 51. Cooling and setting device 52, sizing device 6, sizing liquid storage box 61, sizing guide wheel 62, heating sheet 63, drying device 7, winding device 8, guide wheel 9.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1 to 3, an ultra-high temperature resistant untwisted sewing thread, the said untwisted sewing thread includes: a high temperature resistant untwisted filament fiber bundle 1 and a low melting point filling package 2, the high temperature resistant untwisted filament The outside of the fiber bundle 1 is covered by a low-melting point filling package 2, and the outer circumferential gap of the high-temperature-resistant untwisted filament fiber bundle 1 is filled by a low-melting point filling package 2, and the outside of the low-melting point filling package 2 is The slurry layer 21.

The high-temperature-resistant untwisted filament fiber bundle 1 is made of one or more high-performance ultra-high-temperature-resistant fiber filaments among alumina fibers, silicon carbide fibers, silicon nitride fibers, and boron carbide fibers. Ultra-high temperature resistant fiber filament is a high-performance fiber that can withstand above 1000 °C;

The low-melting point filling package 2 is formed by melting one or both of low-melting point polyamide fibers, polyester fibers, polyethylene fibers, and polypropylene fibers, and the low-melting point fibers have a melting point below 120°C. Fibers with a fineness of 20D-300D.

A preparation device for ultra-high temperature resistant untwisted sewing thread, the preparation device for said untwisted sewing thread includes: a non-twisted unwinding device 3, a wrapping device 4, a melt forming device 5, a sizing device 6, a drying device 7 and Winding device 8, described untwisted unwinding device 3 is arranged coaxially with wrapping device 4, and the bottom of described untwisted unwinding device 3 is provided with wrapping device 4, and described wrapping device 4, low-temperature melting device 5 , the sizing device 6, the drying device 7 and the coiling device 8 are horizontally arranged successively along one direction, and the wrapping device 4, the melt molding device 5, the sizing device 6, the drying device 7 and the coiling device 8 are all Guide wheels 9 are provided.

The wrapping device 4 includes two to four groups of wrapping rotors 41 that rotate along the circumference, and the upper and lower adjacent two groups of wrapping rotors 41 rotate in opposite directions. The melting and molding device 5 includes a low-temperature melting device 51 and cooling A sizing device 52, the cooling and sizing device 52 is set facing the outlet end of the low-temperature melting device 51; the sizing device 6 includes a slurry containing box 61 and two sizing guide wheels 62 arranged therein, and the bottom of the slurry containing box 61 A heater chip 63 is provided.

The low-temperature melting device 51 is a hollow ceramic heating device, and the cooling and shaping device 52 is air-cooled cooling equipment.

A method for preparing ultra-high temperature resistant untwisted sewing thread, the preparation method is based on a preparation device for ultra-high temperature resistant untwisted sewing thread:

The preparation method of described untwisted sewing thread comprises the steps:

Step 1: Collect the untwisted ultra-high temperature resistant fiber into bundles: pass the ultra high temperature resistant fiber through the untwisted unwinding device 3, and remove the low twist of the package fiber by active detwisting, so that it can be twisted in a untwisted state Enter the wrapping device;

Step 2 Wrap the untwisted fiber bundle through the wrapping device: inside the cylindrical wrapping device 4, wrap the rayon with a low melting point on the resistant fiber in a clockwise and counterclockwise direction through two wrapping rotors. High temperature untwisted filament fiber;

Step 3: pass the wrapped fiber bundle through the low-temperature melting device: the product of step 2 is set at the temperature of the low-temperature melting device 51 so that the rayon with a low melting point is fully melted and entangled, so as to bond with each other and fix the high-temperature-resistant untwisted fiber of the core layer. Filament fiber, now forms the structure that low-melting point filling package 2 wraps high temperature resistant untwisted filament fiber bundle 1;

Step 4: pass the above-mentioned fiber bundles through the sizing device: sizing the product of step 3 in the sizing device 6, soaking the surface with the sizing agent, then drying the sizing agent in the drying device 7, and then winding it on the winding device 8 rolls, at this time the preparation of ultra-high temperature resistant untwisted sewing thread is completed.

The active detwisting method in the step 1 refers to unwinding multiple groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 0.5-2m/min.

The rotating speed of the wrapping rotor 41 in the step 2 is 500-5000r/min.

The temperature of the low-temperature melting device 51 in the step 3 is 60-120° C., and the heating time is 5-35 seconds.

The temperature of the sizing agent in the step 4 is 35-90° C., and the sizing agent is one or both of paraffin wax emulsion, polytetrafluoroethylene emulsion, polyvinyl alcohol emulsion and polyethylene glycol emulsion.

Principle of the present invention is described as follows:

The non-twist unwinding device 3 has 2~16 sets of spindles that can run along the circumference. Each set of spindles has a rotary damper. When the yarn is unwound, it will drive the spindle to rotate, and the rotary damper provides tension for the unwinding of the yarn.

The wrapping device 4 is 2~5 sets of wrapping rotors 41 that can run along the circumference, and each set of wrapping rotors 41 has a steering controller and a speed controller, which can control the wrapping direction and wrapping density when the yarn is unwound .

The low-temperature melting device 51 is a hollow ceramic heater with a diameter of 50-100 mm. After the heater is energized, the sewing thread is heated, and the heating temperature is controlled by a temperature sensor and a temperature control device.

The sizing device 6 makes the sizing agent infiltrate the yarn through the size containing box 61, removes the volatile substances in the sizing agent through the drying device, guides it through the reciprocating pendulum needle, and finally uses the active winding device 8 to package it.

Example 1:

An ultra-high temperature resistant untwisted sewing thread, the untwisted sewing thread comprises: a high temperature resistant untwisted filament fiber bundle 1 and a low melting point filling package 2, the outer part of the high temperature resistant untwisted filament fiber bundle 1 is made of low The melting point filling package 2 is covered, and the outer circumferential gap of the high-temperature-resistant untwisted filament fiber bundle 1 is filled with a low-melting point filling package 2 , and the outside of the low-melting point filling package 2 is a slurry layer 21 .

The high-temperature-resistant untwisted filament fiber bundle 1 is made of one or more high-performance ultra-high-temperature-resistant fiber filaments among alumina fibers, silicon carbide fibers, silicon nitride fibers, and boron carbide fibers. Ultra-high temperature resistant fiber filament is a high-performance fiber that can withstand above 1000 °C;

The low-melting point filling package 2 is formed by melting one or both of low-melting point polyamide fibers, polyester fibers, polyethylene fibers, and polypropylene fibers, and the low-melting point fibers have a melting point below 120°C. Fibers with a fineness of 20D-300D.

A preparation device for ultra-high temperature resistant untwisted sewing thread, the preparation device for said untwisted sewing thread includes: a non-twisted unwinding device 3, a wrapping device 4, a melt forming device 5, a sizing device 6, a drying device 7 and Winding device 8, described untwisted unwinding device 3 is arranged coaxially with wrapping device 4, and the bottom of described untwisted unwinding device 3 is provided with wrapping device 4, and described wrapping device 4, low-temperature melting device 5 , the sizing device 6, the drying device 7 and the coiling device 8 are horizontally arranged successively along one direction, and the wrapping device 4, the melt molding device 5, the sizing device 6, the drying device 7 and the coiling device 8 are all Guide wheels 9 are provided.

The wrapping device 4 includes two to four groups of wrapping rotors 41 that rotate along the circumference, and the upper and lower adjacent two groups of wrapping rotors 41 rotate in opposite directions. The melting and molding device 5 includes a low-temperature melting device 51 and cooling A sizing device 52, the cooling and sizing device 52 is set facing the outlet end of the low-temperature melting device 51; the sizing device 6 includes a slurry containing box 61 and two sizing guide wheels 62 arranged therein, and the bottom of the slurry containing box 61 A heater chip 63 is provided.

A method for preparing ultra-high temperature resistant untwisted sewing thread, the preparation method is based on a preparation device for ultra-high temperature resistant untwisted sewing thread:

The preparation method of described untwisted sewing thread comprises the steps:

Step 1: Collect the untwisted ultra-high temperature resistant fiber into bundles: pass the ultra high temperature resistant fiber through the untwisted unwinding device 3, and remove the low twist of the package fiber by active detwisting, so that it can be twisted in a untwisted state Entering the wrapping device, the active detwisting method refers to the unwinding of multiple groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 0.5-2m/min;

Step 2 Wrap the untwisted fiber bundle through the wrapping device: inside the cylindrical wrapping device 4, wrap the rayon with a low melting point on the resistant fiber in a clockwise and counterclockwise direction through two wrapping rotors. On the high-temperature untwisted filament fiber, the rotating speed of the wrapping rotor 41 is 500-5000r/min;

Step 3: pass the wrapped fiber bundle through the low-temperature melting device: the product of step 2 is set at the temperature of the low-temperature melting device 51 so that the rayon with a low melting point is fully melted and entangled, and the temperature of the low-temperature melting device 51 is 60-120 ° C. The time is 5-35 seconds, so as to bond each other and fix the high-temperature-resistant untwisted filament fibers of the core layer, at this time, a structure in which the low-melting point filling package 2 wraps the high-temperature-resistant untwisted filament fiber bundle 1 is formed;

Step 4: pass the above fiber bundles through the sizing device: sizing the product of step 3 in the sizing device 6, so that the surface is soaked with a sizing agent, the temperature of the sizing agent is 35-90°C, and the sizing agent is paraffin wax emulsion, polytetrafluoroethylene One or both of ethylene emulsion, polyvinyl alcohol emulsion, and polyethylene glycol emulsion, then the sizing agent is dried in the drying device 7, and then it is wound on the winding device 8 to form a roll. The preparation of ultra-high temperature untwisted sewing thread is completed.

Example 2:

Embodiment 2 is basically the same as Embodiment 1, and its difference is:

The low-temperature melting device 51 is a hollow ceramic heating device, and the cooling and shaping device 52 is air-cooled cooling equipment.

Example 3

Embodiment 3 Embodiment 1 is basically the same, and its difference is:

The high-temperature-resistant untwisted filament bundle 1 uses three 205tex silicon carbide fibers, and the low-melting point filling package 2 uses low-melting point 75D polyamide fibers.

In step 1, three groups of ultra-high temperature resistant fibers are passed through the untwisted unwinding device 3, and the low twist of the packaged fibers is removed by means of active detwisting, so that they enter the wrapping device 4 in an untwisted state. The active detwisting method refers to the unwinding of the three groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 1m/min;

In step 2, through two hollow wrapping rotors 41 rotating clockwise and counterclockwise, the rayon with low melting point is wrapped on the untwisted high-temperature-resistant untwisted filament fiber bundle 1 in different directions. The speed of the wrapped rotor is 5000r/min;

Step 3. Set the appropriate temperature through the hollow ceramic heating roller so that the rayon with a low melting point is fully melted and entangled to bond the ultra-high temperature resistant untwisted fiber. The melting temperature is 85°C and the melting time is 30s;

Step 4: Introduce the heat-resistant untwisted fiber of the outer layer into a paraffin emulsion sizing device at a temperature of 65°C, a surplus size removal device, a drying device, and finally pass through an active winding device to obtain a sewing thread.

The performance test of the prepared high temperature resistant untwisted sewing thread is carried out. The test results are as follows: the breaking strength at room temperature is 53.1 cN/tex, the number of abrasions is 1307 times, the breaking strength at 1200 ℃ is 38.5 cN/tex, and at 1500 ℃ the breaking strength is 38.5 cN/tex. The breaking strength is 24.4 cN/tex, and the mass change of SiC fibers from room temperature to 1500 °C is only 0.55%. This process is suitable for producing sewing threads with a high temperature resistance of 1200 °C and above, which can be used to sew one or more of multi-layer alumina fabrics, silicon carbide fabrics, silicon nitride fabrics, and boron carbide fabrics. The wrapped rayon and paraffin sizing agent on the surface decompose at high temperature, which can take away part of the heat and play a certain role in protecting the core yarn ceramic fiber.

Example 4

Embodiment 4 Embodiment 3 is basically the same, and its difference is:

In the adjustment example 2, one 205tex silicon carbide fiber and six 65tex alumina fibers were plied and merged through the untwisted unwinding device 3 as a high-temperature-resistant untwisted filament fiber bundle 1;

In step 1, 7 groups of ultra-high temperature resistant fibers are passed through the untwisting unwinding device 3, and the low twist of the packaged fibers is removed by means of active detwisting, so that they enter the wrapping device 4 in an untwisted state. The active detwisting method refers to the unwinding of the three groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 1m/min;

In step 2, through two hollow wrapping rotors 41 rotating clockwise and counterclockwise, the rayon with low melting point is wrapped on the untwisted high-temperature-resistant untwisted filament fiber bundle 1 in different directions. The speed of the wrapped rotor is 5000r/min;

Step 3. Set the appropriate temperature through the hollow ceramic heating roller so that the rayon with a low melting point is fully melted and entangled to bond the ultra-high temperature resistant untwisted fiber. The melting temperature is 85°C and the melting time is 30s;

Step 4: Introduce the heat-resistant untwisted fiber of the outer layer into a paraffin emulsion sizing device at a temperature of 65°C, a surplus size removal device, a drying device, and finally pass through an active winding device to obtain a sewing thread.

The performance test of the prepared high temperature resistant untwisted sewing thread is carried out. The test results are as follows: the breaking strength at room temperature is 37.3 cN/tex, the number of abrasions is 1259 times, the breaking strength at 1200 ℃ is 26.8 cN/tex, and at 1500 ℃ The breaking strength is 16.4 cN/tex, and the mass change of alumina fibers from room temperature to 1500 ℃ is only 0.13%.

Example 5

Embodiment 5 Embodiment 3 is basically the same, and its difference is:

In the adjustment embodiment 2, nine 65tex alumina fibers are plyed and lined as high temperature resistant untwisted filament fiber bundles 1 through the untwisted unwinding device 3;

In step 1, 9 groups of ultra-high temperature resistant fibers are passed through the untwisted unwinding device 3, and the low twists of the packaged fibers are removed by means of active detwisting, so that they enter the wrapping device 4 in an untwisted state. The active detwisting method refers to the unwinding of the three groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 1m/min;

In step 2, through two hollow wrapping rotors 41 rotating clockwise and counterclockwise, the rayon with low melting point is wrapped on the untwisted high-temperature-resistant untwisted filament fiber bundle 1 in different directions. The speed of the wrapped rotor is 5000r/min;

Step 3. Set the appropriate temperature through the hollow ceramic heating roller so that the rayon with a low melting point is fully melted and entangled to bond the ultra-high temperature resistant untwisted fiber. The melting temperature is 85°C and the melting time is 30s;

Step 4: Introduce the heat-resistant untwisted fiber of the outer layer into a paraffin emulsion sizing device at a temperature of 65°C, a surplus size removal device, a drying device, and finally pass through an active winding device to obtain a sewing thread.

The performance test of the prepared high temperature resistant untwisted sewing thread is carried out. The test results are as follows: the breaking strength at room temperature is 28.9 cN/tex, the number of abrasions is 1116 times, the breaking strength at 1200 °C is 20.5 cN/tex, and at 1500 °C The breaking strength is 11.8 cN/tex.

Example 6

Embodiment 6 Embodiment 1 is basically the same, and its difference is:

The high-temperature-resistant untwisted filament bundle 1 uses four 165tex silicon nitride fibers, and the low-melting point filling package 2 uses low-melting point 50D polyester fibers.

In step 1, 4 groups of ultra-high temperature resistant fibers are passed through the untwisting unwinding device 3, and the low twist of the packaged fibers is removed by means of active detwisting, so that they enter the wrapping device 4 in an untwisted state. The active detwisting method refers to the unwinding of 5 groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 1.7m/min;

In step 2, through two hollow wrapping rotors 41 rotating clockwise and counterclockwise, the rayon with low melting point is wrapped on the untwisted high-temperature-resistant untwisted filament fiber bundle 1 in different directions. The rotating speed of the wrapped rotor is 1000r/min;

Step 3: Set the appropriate temperature through the hollow ceramic heating roller so that the rayon with a low melting point is fully melted and entangled with the ultra-high temperature resistant untwisted fiber. The melting temperature is 110°C and the melting time is 12s;

Step 4: Introduce the heat-resistant untwisted fiber of the outer layer fusion-bonded into a polytetrafluoroethylene emulsion sizing device at a temperature of 80°C, a surplus size removal device, a drying device, and finally pass through an active winding device to obtain a sewing thread.

This sewing thread can be used for sewing high-temperature-resistant wave-transparent materials.

Example 7

Embodiment 7 Embodiment 1 is basically the same, and its difference is:

The high-temperature-resistant untwisted filament fiber bundle 1 adopts two 165tex silicon nitride fibers and four 65tex alumina fibers to be plyed and threaded through the untwisted unwinding device 3 as the high-temperature-resistant untwisted filament fiber bundle 1. The low melting point filling package 2 adopts low melting point 40D polypropylene fiber.

In step 1, 6 groups of ultra-high temperature resistant fibers are passed through the untwisting unwinding device 3, and the low twist of the packaged fibers is removed by means of active detwisting, so that they enter the wrapping device 4 in an untwisted state. The active detwisting method refers to the unwinding of 7 groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 0.6m/min;

In step 2, through two hollow wrapping rotors 41 rotating clockwise and counterclockwise, the rayon with low melting point is wrapped on the untwisted high-temperature-resistant untwisted filament fiber bundle 1 in different directions. The speed of the wrapped rotor is 4000r/min;

Step 3. Set the appropriate temperature through the hollow ceramic heating round roller so that the rayon with a low melting point is fully melted and entangled to bond the ultra-high temperature resistant untwisted fiber. The melting temperature is 120°C and the melting time is 33s;

Step 4: Introduce the heat-resistant untwisted fiber of the outer layer into a polyvinyl alcohol emulsion sizing device at a temperature of 35°C, a surplus size removal device, a drying device, and finally pass through an active winding device to obtain a sewing thread.

This embodiment can prepare low-cost high-temperature-resistant wave-transparent sewing thread.

Example 8

Embodiment 8 Embodiment 1 is basically the same, and its difference is:

The high-temperature-resistant untwisted filament fiber bundle 1 adopts two silicon nitride fibers of 165tex and one silicon carbide fiber of 205tex to be plyed and threaded through the untwisted unwinding device 3 as a high-temperature-resistant untwisted filament fiber bundle 1. The low-melting point filling package 2 adopts low-melting point 100D polyethylene fiber.

In step 1, three groups of ultra-high temperature resistant fibers are passed through the untwisted unwinding device 3, and the low twist of the packaged fibers is removed by means of active detwisting, so that they enter the wrapping device 4 in an untwisted state. The active detwisting method refers to the unwinding of 9 groups of ultra-high temperature resistant fibers in the opposite direction to that of the package, and the unwinding speed is 1.2m/min;

In step 2, through two hollow wrapping rotors 41 rotating clockwise and counterclockwise, the rayon with low melting point is wrapped on the untwisted high-temperature-resistant untwisted filament fiber bundle 1 in different directions. The speed of the wrapped rotor is 3000r/min;

Step 3: Set the appropriate temperature through the hollow ceramic heating roller so that the rayon with a low melting point is fully melted and entangled with the ultra-high temperature resistant untwisted fiber. The melting temperature is 90°C and the melting time is 24s;

Step 4: Introduce the high-temperature-resistant untwisted fibers that are fused and bonded on the outer layer into a paraffin emulsion sizing device at a temperature of 60°C, a surplus size removal device, and a drying device, and finally pass through an active winding device to obtain sewing threads.

This embodiment can prepare high-strength, low-cost high-temperature-resistant wave-transparent sewing thread.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with this technology can make various changes and modifications without departing from the technology and scope of the present invention. Therefore The scope of protection of the present invention should be defined by the claims.

Claims (10)

1. The utility model provides a resistant ultra-high temperature untwisted sewing thread which characterized in that:

the untwisted sewing thread comprises: the high-temperature-resistant untwisted filament fiber bundle comprises a high-temperature-resistant untwisted filament fiber bundle (1) and a low-melting-point filling package (2), wherein the outside of the high-temperature-resistant untwisted filament fiber bundle (1) is coated by the low-melting-point filling package (2), the gap between the outer circumference of the high-temperature-resistant untwisted filament fiber bundle (1) is filled by the low-melting-point filling package (2), and the outside of the low-melting-point filling package (2) is a pulp coating layer (21);

the high-temperature-resistant untwisted filament fiber bundle (1) is a high-performance fiber filament capable of resisting the temperature of more than 1000 ℃; the low-melting-point filling package (2) is low-melting-point fibers with the melting point below 120 ℃.

2. The ultrahigh temperature resistant untwisted sewing thread of claim 1, wherein:

the high-temperature-resistant untwisted filament fiber bundle (1) is made of one or more high-performance ultrahigh-temperature-resistant fiber filaments of alumina fibers, silicon carbide fibers, silicon nitride fibers and boron carbide fibers;

the low-melting-point filling package (2) is formed by melting one or two of low-melting-point polyamide fiber, polyester fiber, polyethylene fiber and polypropylene fiber, and the fineness of the low-melting-point fiber is 20D-300D.

3. An apparatus for preparing ultra-high temperature resistant untwisted sewing thread according to claim 1 or 2, wherein:

the preparation device of the untwisted sewing thread comprises: untwisted unwinding device (3), package device (4), melting forming device (5), sizing apparatus (6), drying device (7) and wind package device (8), untwisted unwinding device (3) and the coaxial setting of package device (4), the below of untwisted unwinding device (3) is provided with package device (4), melting forming device (5), sizing apparatus (6), drying device (7) and wind package device (8) transversely arrange along an orientation in proper order, all be provided with between package device (4), melting forming device (5), sizing apparatus (6), drying device (7) and the wind package device (8) leading wheel (9).

4. The apparatus for preparing the ultra-high temperature resistant untwisted sewing thread according to claim 3, wherein:

the wrapping device (4) comprises two to five groups of wrapping rotors (41) which rotate along the circumference, the two groups of wrapping rotors (41) which are adjacent up and down rotate along opposite directions, the melting forming device (5) comprises a low-temperature melting device (51) and a cooling forming device (52), and the cooling forming device (52) is arranged right opposite to the outlet end of the low-temperature melting device (51); the sizing device (6) comprises a size containing box (61) and two sizing guide wheels (62) arranged in the size containing box, and a heating sheet (63) is arranged at the bottom of the size containing box (61).

5. The apparatus for preparing the ultra-high temperature resistant untwisted sewing thread according to claim 4, wherein:

the low-temperature melting device (51) is a hollow ceramic heating device, and the cooling and shaping device (52) is air-cooled cooling equipment.

6. A method for preparing the ultrahigh temperature resistant untwisted sewing thread according to claim 1 or 2, wherein:

the manufacturing method is based on the manufacturing device of the ultrahigh temperature resistant untwisted sewing thread of claim 3, 4 or 5:

the preparation method of the untwisted sewing thread comprises the following steps:

step 1, bundling untwisted ultrahigh temperature resistant fibers: enabling the ultra-high temperature resistant fiber to pass through a zero-twist unwinding device (3), removing low twist of the packaged fiber in an active untwisting mode, and enabling the fiber to enter a wrapping device in a zero-twist state;

step 2, wrapping the untwisted fiber bundles by a wrapping device: in the cylindrical wrapping device (4), the artificial silk with low melting point is wrapped on the high-temperature resistant untwisted filament fiber in the clockwise direction and the anticlockwise direction respectively through two wrapping rotors;

and 3, passing the wrapped fiber bundle through a low-temperature melting device: fully melting and cohering the low-melting-point rayon by setting the temperature of the hollow ceramic heating round roller of the product obtained in the step 2, so as to bond the rayon and fix the high-temperature-resistant untwisted filament fibers of the core layer, and forming a structure that the low-melting-point filling package (2) wraps the high-temperature-resistant untwisted filament fiber bundle (1);

and 4, passing the fiber bundle through a sizing device: and (3) sizing the product obtained in the step (3) in a sizing device (6) to enable the surface of the product to be soaked with sizing agent, then drying the sizing agent in a drying device (7), and then winding the sizing agent on a winding device (8) to form a coil, wherein the preparation of the ultrahigh-temperature-resistant untwisted sewing thread is finished.

7. The method for preparing the ultrahigh temperature resistant untwisted sewing thread according to claim 6, wherein:

the active untwisting mode in the step 1 refers to that multiple groups of ultrahigh temperature resistant fibers are unwound in a rotating mode opposite to the winding direction, and the unwinding speed is 0.5-2 m/min.

8. The method for preparing the ultrahigh temperature resistant untwisted sewing thread according to claim 7, wherein:

the rotating speed of the wrapping rotor (41) in the step 2 is 500-5000 r/min.

9. The method for preparing the ultrahigh temperature resistant untwisted sewing thread according to claim 8, wherein:

the temperature of the hollow ceramic heating round roller in the step 3 is 60-120 ℃, and the heating time is 5-35 seconds.

10. The method for preparing the ultrahigh temperature resistant untwisted sewing thread according to claim 9, wherein:

the temperature of the sizing agent in the step 4 is 35-90 ℃, and the sizing agent is one or two of paraffin emulsion, polytetrafluoroethylene emulsion, polyvinyl alcohol emulsion and polyethylene glycol emulsion.

Images