Flat belt rope and dyeing method thereof

Abstract

The invention belongs to the field of fabric dyeing, and discloses a flat belt rope and a dyeing method thereof. The dyeing method comprises the following steps: winding a flat belt rope to be dyed in a ring shape to form a plurality of loose yarn bundles; the flat belt rope to be dyed is made of nylon spandex blended materials, and the cross section of the flat belt rope to be dyed is rectangular. The yarn bundles are placed in a dye solution to be dyed, and a dyed semi-finished product is obtained; the dye solution comprises an acid dye and a leveling agent, and the dyeing is carried out when the pH value is 5-6; and washing the dyed semi-finished product with water, dehydrating, and drying under a room-temperature ventilation condition to obtain the colored flat belt rope. According to the invention, the dyeing process, the process conditions and the like are improved, so that the flat shape of the belt rope is not changed while the dyeing is uniform, and the requirements on usability and attractiveness of the mask ear belt are met. In addition, the dyeing method disclosed by the invention is simple and easy to implement and has relatively high production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of fabric dyeing, and particularly to a flat belt rope and a dyeing method thereof. Background Art

[0002] For the dyeing of some ear straps of KN95 masks, the ear strap material is generally a nylon spandex blended fabric, and due to the special shape of the flat rope belt, if it is wound around a cheese for dyeing, the shape is easily deformed, which does not conform to the flat shape of the ear strap, bringing great influence to the aesthetics and usability. And adopting the methods of stacking and slack dyeing and high-temperature setting in an oven, there are also problems of low production efficiency and a large demand for manpower.

[0003] Therefore, it is necessary to develop a dyeing technology for flat belt ropes to solve technical difficulties such as shape deformation after ear strap dyeing. Summary of the Invention

[0004] In view of this, the present invention provides a flat belt rope and a dyeing method thereof. Through the dyeing method of the present invention, a colored belt rope with uniform color and a shape meeting the aesthetic requirements of flat ear straps can be obtained, and the method is simple to operate and has a relatively high production efficiency.

[0005] The present invention provides a dyeing method for a flat belt rope, comprising the following steps:

[0006] Winding the flat belt rope to be dyed in a circular shape to form a plurality of slack yarn bundles; the flat belt rope to be dyed is made of a nylon spandex blended material and has a rectangular cross-section;

[0007] Placing the yarn bundles in a dye solution for dyeing to obtain a semi-finished dyed product; the dye solution contains an acid dye and a leveling agent, and the dyeing is carried out at a pH value between 5 and 6;

[0008] Washing the semi-finished dyed product with water and then dehydrating it, and then drying it under room temperature ventilation conditions to obtain a colored flat belt rope.

[0009] In an embodiment of the present invention, the flat belt rope to be dyed is wound in a circular shape by a skein winding machine and is loosely and equidistantly bundled to form a plurality of slack yarn bundles.

[0010] In an embodiment of the present invention, the dye solution is prepared by dissolving an acid dye, a leveling agent, and a dyeing acid in water and filtering through a 100-200 mesh filter screen.

[0011] In an embodiment of the present invention, in the dye solution, the weight percentage of the acid dye to the fabric is 0.5-1.5%; the concentration of the leveling agent is 1-2 g / L.

[0012] In an embodiment of the present invention, the leveling agent is one or both of sodium higher alcohol sulfate and non-ionic surfactant of fatty alcohol polyoxyethylene ether.

[0013] In an embodiment of the present invention, the yarn bundle is bagged and then placed in a dye solution in an industrial washing machine for dyeing, and the bath ratio is 1:20 - 30.

[0014] In an embodiment of the present invention, the temperature of the dyeing is 65 - 95 °C and the time is 2 - 4 hours.

[0015] In an embodiment of the present invention, the water washing includes: first washing with normal temperature water at 25 - 35 °C, then washing with hot water at 50 - 60 °C, and finally washing with normal temperature water at 25 - 35 °C; the drying is natural air drying or drying with a hair dryer.

[0016] The present invention provides a colored flat cord obtained by the dyeing method as described above, which has elasticity.

[0017] In an embodiment of the present invention, the colored flat cord is used as a mask ear strap.

[0018] The present invention mainly develops a dyeing method for a flat cord, and its steps include: forming a slack yarn bundle (nylon spandex blended material) of the flat cord to be dyed, dyeing it under certain process conditions, and then performing water washing, dehydration and room temperature ventilation drying to obtain a colored flat cord (with a rectangular cross-section). The present invention improves from aspects such as the dyeing process and process conditions, so as to ensure uniform dyeing while keeping the flat shape of the cord unchanged, meeting the usability and aesthetic requirements for use as a mask ear strap. Moreover, the dyeing method of the present invention is simple and easy to implement, and has a high production efficiency. Description of the Drawings

[0019] Figure 1 It is a physical photo of the flat cord to be dyed in some embodiments of the present invention;

[0020] Figure 2 It is a schematic diagram of winding into a yarn bundle with a lea reel in some embodiments of the present invention;

[0021] Figure 3 It is a schematic diagram of the cord yarn bundle and the bundling point position in some embodiments of the present invention;

[0022] Figure 4 It is a photo of the industrial washing machine for dyeing in some embodiments of the present invention;

[0023] Figure 5 It is a schematic diagram of hanging and drying the colored flat cord in a preferred embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the rectangular cross-section of the red flat cord in a preferred embodiment of the present invention;

[0025] Figure 7 This is a photo of the flat belt rope after dyeing the cheese yarn for the comparative example of the present invention. Detailed implementation manners

[0026] In order to more clearly understand the technical features, objectives and effects of the present invention, the technical solutions of the present invention will be described in detail below with reference to specific embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] The present invention provides a method for dyeing a flat belt rope, comprising the following steps:

[0028] Winding the flat belt rope to be dyed in a circular shape to form a plurality of loose yarn bundles; the flat belt rope to be dyed is made of a nylon and spandex blended material, and has a rectangular cross-section;

[0029] Placing the yarn bundles in a dye solution for dyeing to obtain a semi-finished dyed product; the dye solution contains an acid dye and a leveling agent, and the dyeing is carried out at a pH value between 5 and 6;

[0030] Washing and dehydrating the semi-finished dyed product, and then drying it under room temperature ventilation conditions to obtain a colored flat belt rope.

[0031] Through the simple and efficient dyeing method of the present invention, a colored belt rope with uniform color and a shape meeting the aesthetic requirements of flat ear straps can be obtained, which is beneficial for application.

[0032] In the embodiment of the present invention, the flat belt rope material to be dyed is first prepared, which is usually a white nylon and spandex blended fabric with a width of 2.0 mm - 7.0 mm; specifically here, a flat belt rope with a width of 5 mm, woven from nylon (polyamide) and spandex, is used, and the mass ratio of spandex is between 5% and 30%, and nylon occupies the remaining ratio. Further, in the specific embodiment here, the proportion of the flat belt rope is 70% nylon and 30% spandex; the weight per meter is about 0.5 - 1.0 grams. The flat belt ropes to be dyed in some embodiments are as Figure 1 shown, and its white color is the conventional whiteness to be dyed.

[0033] Among them, nylon fiber is the common name of polyamide fiber, which is a polyamide fiber, and the basic constituent is a macromolecule connected by an amide bond -NHCO-. The polyamides commonly used in textile fabrics are nylon 6 and nylon 66; pure polyamide fabrics can be dyed with various dyes such as disperse dyes and acid dyes. Spandex is an elastic chemical fiber, and mainly disperse dyes are used for dyeing. Dyeing techniques can be classified not only according to different application methods of dyes, but also according to different requirements and methods, including loose fiber dyeing, yarn dyeing (such as cheese yarn dyeing, beam dyeing, etc.), greige cloth dyeing, garment dyeing, etc.

[0034] Preferably, the flat belt cord to be dyed in the embodiment of the present invention is wound in a circular shape by a skein winding machine and is loosely and equidistantly bundled to form a plurality of slack yarn bundles, so as to ensure that the subsequent dyeing process will not be scattered and will not affect its flat shape. Exemplarily, the regular circular shape of the flat belt cord to be dyed wound into a yarn bundle by the skein winding machine is as Figure 2 shown; and the four sides are tied up with the flat belt cord material. When tying up, it should be loose to prevent uneven dyeing and white showing at the tied-up places, specifically as Figure 3 shown.

[0035] A skein winding machine is an instrument for evaluating the technical index of linear density. The detection process is completed by the motor driven by the program control of the instrument to drive the yarn frame to rotate. Specifically, a motor is installed on the base of the instrument, and the power of the motor drives the yarn frame to rotate; the instrument is equipped with a yarn guide to let the specimen pass from the specimen tube to the yarn frame along a specified path; the instrument is equipped with a traversing yarn distributor to let the specimen be arranged on the yarn frame in an orderly manner. The circumference of the yarn frame: standard 1000mm ± 1mm; specially customized 800mm. The preset range of the number of turns of the yarn frame: 2 - 9999 turns. After the skein winding machine is started, it will wind the yarn into the set number of turns. The worker will calculate the length by multiplying the number of turns by the turn length, and then calculate the linear density according to the known length and weighing (generally the constant weight after drying at the standard required temperature).

[0036] In the embodiment of the present invention, a skein winding machine is used to wind the flat belt cord to be dyed in a circular shape around the yarn frame to form a plurality of slack yarn bundles, which is beneficial to subsequent processes such as tension-free dyeing.

[0037] In the embodiment of the present invention, a dye solution (referred to as a dye liquor for short) is prepared at the same time: the amount of the dye can be calculated according to the dye recipe for laboratory sample making, and the accurately weighed dye is prepared. After the chemicals are dissolved, it should be filtered through a 100 - 200 mesh filter screen to prevent the appearance of undissolved granular dyes.

[0038] The dye solution in the embodiment of the present invention is an aqueous solution mainly containing acid dyes and leveling agents, and a dyeing acid can be added to control the pH value between 5 and 6. Acid dyes refer to dyes containing acidic groups in the dye molecule, also known as anionic dyes. The acid dyes described in the present invention include strong acid dyes, weak acid dyes, acid mordant dyes, etc., and the colors can be various such as red, orange, yellow, blue, etc. Exemplarily, dye SRE orange and / or dye acid red A - 3G can be used. And the weight percentage of the acid dye to the fabric is preferably 0.5 - 1.5% (owf).

[0039] Further, the leveling agent in the dye solution is preferably one or two of sodium higher alcohol sulfate and nonionic surfactant of fatty alcohol polyoxyethylene ether, and more preferably a compound of the two types. The specific fatty alcohol polyoxyethylene ether leveling agent can be: Peregal O type (molecular formula RO(CH2CH2O)3HR = C12 H 25 ) etc. Such leveling agents contain polyoxyalkylene ethers in the long molecular chains, and can form relatively loose hydrogen bonds with groups such as hydroxyl (-OH) and amino (-NH) groups in dye molecules. On the one hand, in the dye bath, it will combine with dyes to form a loose complex, hindering the adsorption and dyeing of dyes, thus playing a role in retarding and leveling dyeing. On the other hand, in the dye bath, this type of leveling agent can enhance the interfacial migration and overall migration of dyes, further promoting the uniform adsorption of dyes.

[0040] In some embodiments of the present invention, the concentration of the leveling agent can be 1-2 g / L. The dyeing acid can be acetic acid, and the dosage can be 1-2 g / L.

[0041] The dyeing steps of some preferred embodiments of the present invention include: preparing a dye bath - dyeing the flat belt cord yarn bundle → cold water washing → hot water washing → cold water washing → dehydration → drying.

[0042] After completing the preparation of the dye bath, in the embodiments of the present invention, the prepared flat belt cord yarn bundle is packed in a bag (mesh bag) and weighed, and then put into Figure 4 the dyeing machine as shown for dyeing. The dyeing machine is an industrial washing machine, and its working principle for washing and decontaminating is based on the combination of mechanical force, hydraulic force and chemical action, and realizes efficient washing through an automated control system. The mechanical force and hydraulic force mainly drive the drum to rotate through the transmission system, so that the clothes are continuously tumbled, rubbed and beaten in the drum, and at the same time, they are soaked in water to penetrate the moisture. In the embodiments of the present invention, the industrial washing machine is used as the main dyeing equipment, and the yarn bundle packed in the mesh bag is subjected to slack dyeing in it, which can ensure the dyeing effect and the flat belt cord does not deform after dyeing.

[0043] In the embodiments of the present invention, preferably according to a bath ratio of 1:20-30, the prepared dye bath is put in, and the dyeing acid can also be added from the dyeing machine feeding port to adjust the pH value of the dyeing to between 5 and 6. The bath ratio of 1:20-30 for dyeing refers to the mass ratio of 1 kg of the yarn fabric to be dyed to 20-30 L of the prepared dye bath. If the bath ratio is too small, it is easy to dye unevenly. In the embodiments of the present invention, the temperature of the dyeing is 65-95 °C, and the time is 2-4 hours. Preferred dyeing process conditions include: heating up to 60-70 °C and holding for 10-15 min, then heating up to 85-90 °C and running for 50-70 min, discharging the liquid, dehydrating, to obtain a semi-finished dyed product.

[0044] After that, in the embodiment of the present invention, the semi-finished dyed product is washed with water (i.e., water washing), preferably first washed with cold water, then with hot water, and then with cold water again, and after dehydration and drying, the dyed finished product colored flat belt rope is obtained. Specifically, the water washing includes: first washing with normal temperature water (which can be called cold water, between 25 and 35 °C) for 5 - 15 minutes, then washing with hot water between 50 and 60 °C for 5 - 10 minutes, and then washing with cold water between 25 and 35 °C for 5 - 10 minutes to fully wash away the floating color and wash to neutral.

[0045] In the embodiment of the present invention, the dehydrated dyed yarn bundle can be carefully taken out of the bag and spread out, put on a drying rod and hung, and naturally dried or dried with a hair dryer under room temperature and ventilated conditions, and can be hung and dried as shown in Figure 5 to shape the finished product, further avoiding the situation of the flat belt rope being distorted and deformed during high-temperature shaping in the oven. In the embodiment of the present invention, the colored flat belt rope can also be wound into a thread ball shape, and the flat shape cannot be damaged during winding, ensuring that there is no twisting and knotting; if the twisting situation cannot be adjusted, the yarn needs to be cut and reconnected. The dyeing method of the present invention is simple and easy to operate, and has a high production efficiency.

[0046] The embodiment of the present invention provides a colored flat belt rope obtained by the dyeing method as described above, which has a certain elasticity. In the embodiment of the present invention, the color of the colored flat belt rope can be determined according to customer requirements, including one or more of various colors such as red, yellow, blue, orange, purple, green, black, gray, etc., and is used as a mask ear strap; in some specific embodiments, it can be red, and the cross-section is as shown in Figure 6 The colored flat belt rope described in the embodiment of the present invention is evenly dyed, has high color fastness, and its flat shape remains unchanged, meeting the usability and aesthetic requirements for use as a mask ear strap.

[0047] To better illustrate the present invention, further examples are given below through embodiments. In the embodiments, all original reagents and materials can be commercially obtained, and the experimental methods without specifying specific experimental conditions are conventional methods and conditions well-known in the art.

[0048] The dyes and auxiliaries used include: Dye A-3G Scarlet Red (Jiangsu Shenxin Dye Chemical Co., Ltd.) and SRE Orange (Jiangsu Shenxin Dye Chemical Co., Ltd.); Levelling Agent 725A is purchased from Zhejiang Liansheng New Materials Co., Ltd. (non-ionic type, a preparation based on aliphatic carboxyl compounds and saturated aliphatic and higher aromatic hydrocarbons, resistant to hard water and acids, alkalis, and electrolytes in general printing pastes); the dyeing acid is acetic acid.

[0049] Example 1

[0050] Step 1. Material preparation:

[0051] 1.1 Preparation of the dye solution: Calculate the amount of dye required according to the desired amount of the dye solution and accurately weigh it. The dye solution formula is as follows in the table. After dissolving the materials with water, filter through a 100 - 200 - mesh filter to prevent the appearance of undissolved granular dyes.

[0052] Table 1 Dye solution formula of the embodiments of the present invention

[0053] Name Dosage / %(owf) A-3G Scarlet 0.7％ SRE Orange 0.3％ Leveling Agent 725A 1 g / L Dyeing Acid 2 g / L

[0054] 1.2 Prepare the flat belt rope. Use a lea reel to wind the flat belt rope to be dyed into a yarn bundle (for the shape of a regular circular coil, see Figure 2 ), and loosely tie it around the perimeter with the flat belt rope material.

[0055] Specifications of the flat belt rope to be dyed: White nylon - spandex blended fabric, 70% nylon and 30% spandex, width 5 mm, and the weight per meter is about 0.72 grams.

[0056] Step 2: After packing and weighing (14.1 kg) the prepared flat belt rope yarn bundle to be dyed in a bag, put it into an industrial washing machine for dyeing. According to the bath ratio of 1:25, add the prepared dye solution (353 L of water), and adjust the pH value of the dyeing to between 5 and 6. The dyeing process includes: heating to 70 °C and holding for 10 min, then heating to 90 °C and running for 60 min, discharging the liquid, and dehydrating.

[0057] Step 3: Wash the obtained semi - finished dyed product: First, wash it with normal - temperature water between 25 and 35 °C for 10 minutes, then wash it with hot water between 50 and 60 °C for 10 minutes, then wash it with normal - temperature water between 25 and 35 °C for 10 minutes again, dehydrate, carefully take out the colored flat belt rope yarn bundle from the bag, spread it out and put it on a drying rod, and dry it with a hair dryer under room - temperature ventilation conditions to obtain the finished colored flat belt rope.

[0058] Comparative Example 1

[0059] Loosen the flat belt rope to be dyed onto a dyeing bobbin and place it in a dyeing machine for dyeing.

[0060] The dye solution and the dyeing process include: bath ratio 1:10; accurately weigh the dye and the amount of water according to the laboratory proofing formula. Adjust the pH value of the dyeing to between 5 and 6. Heat to 70 °C and hold for 10 min, then heat to 90 °C and run for 60 min, discharge the liquid, and dehydrate; wash the obtained semi - finished dyed product: First, wash it with normal - temperature water between 25 and 35 °C for 10 minutes, then wash it with hot water between 50 and 60 °C for 10 minutes, then wash it with normal - temperature water between 25 and 35 °C for 10 minutes again, dehydrate, and then dry it in a radio - frequency dryer. Set the speed of the radio - frequency dryer to 3 m / h to obtain the finished product as Figure 7 shown.

[0061] According to the national standard method, the performance tests of the dyed finished products of Example 1 and Comparative Example 1 were carried out. The test results of K / S value, color fastness, and deformation are compared as follows. The dyeing depths and color fastness indexes of the two are basically the same, but when dyed wound on a cheese, the shape is easily deformed and does not conform to the flat shape of the earloop. However, the colored flat tape rope finished product of the embodiment of the present application used as a mask earloop well meets the customer requirements.

[0062] Table 2 Performance test results of examples and comparative examples

[0063]

[0064] It can be seen from the above examples that through the dyeing process and process conditions of the embodiments of the present invention, the obtained colored flat tape rope finished product has uniform dyeing, and at the same time its flat shape remains unchanged, meeting the usability and aesthetic requirements for use as a mask earloop. Moreover, the production method of the dyed product of the present invention is simple and easy to implement, and has a high production efficiency (while adopting the method of dyeing in a laboratory dyeing pot and high-temperature setting in an oven, the production capacity is 2 kg per day, and the labor demand is large).

[0065] The above examples are only used to illustrate the technical features and implementation process of the present invention, rather than limiting the technical solutions of the present invention. It should be pointed out that for those of ordinary skill in the art, the present invention can still be modified or equivalently replaced, and any modification or replacement without departing from the principle of the present invention is covered by the protection of the present invention.

Claims

1. A dyeing method for a flat belt rope, characterized in that, It includes the following steps: The flat belt rope to be dyed is wound in a circular shape to form multiple loose yarn bundles; the flat belt rope to be dyed is made of nylon and spandex blended material, and its cross-section is rectangular; The yarn bundles are placed in a dye solution for dyeing to obtain a semi-finished dyed product; the dye solution contains acid dyes and leveling agents, and the dyeing is carried out at a pH value between 5 and 6; The semi-finished dyed product is washed with water and then dehydrated, and then dried under room temperature and ventilation conditions to obtain a colored flat belt rope.

2. The dyeing method according to claim 1, wherein, The flat belt rope to be dyed is wound in a circular shape by a winding reel, and is loosely and equidistantly tied to form multiple loose yarn bundles.

3. The dyeing method according to claim 1, characterized in that, The dye solution is prepared by dissolving acid dyes, leveling agents and dyeing acids in water and filtering through a 100-200 mesh filter screen.

4. The dyeing method according to claim 3, wherein In the dye solution, the weight percentage of the acid dye to the fabric is 0.5-1.5%; the concentration of the leveling agent is 1-2 g / L.

5. The dyeing method according to claim 3, characterized in that, The leveling agent is one or two of sodium higher alcohol sulfate and fatty alcohol polyoxyethylene ether non-ionic surfactants.

6. The dyeing method according to any one of claims 1 to 5, characterized in that, The yarn bundles are bagged and placed in the dye solution of an industrial washing machine for dyeing, and the bath ratio is 1:20-30.

7. The dyeing method according to any one of claims 1-5, characterized in that, The temperature of the dyeing is 65-95 °C, and the time is 2-4 hours.

8. The dyeing method according to any one of claims 1-5, characterized in that, The water washing includes: first washing with normal temperature water at 25-35 °C, then washing with hot water at 50-60 °C, and finally washing with normal temperature water at 25-35 °C; the drying is natural drying or drying with a hair dryer.

9. The colored flat belt rope obtained by the dyeing method according to any one of claims 1-8 has elasticity.

10. The colored flat belt cord according to claim 9, wherein The colored flat belt rope is used as a mask ear strap.

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