Knitted fabric hot-pressing lap joint process

Abstract

The invention relates to the field of knitted fabric processing, and discloses a knitted fabric hot-pressing lap joint process which comprises the following steps: S1, fabric cleaning: firstly, deeply cleaning a knitted fabric by using a mild detergent and clear water to thoroughly remove surface impurities; s2, ironing and leveling: ironing the fabric by using professional ironing equipment under precise temperature and pressure control; s3, ultrasonic gluing is conducted, wherein gluing operation is conducted through equipment; S4, machine splicing is conducted, wherein edge parts needing to be lapped are accurately aligned and overlapped; the hot-pressing temperature, pressure and time need to be specifically adjusted according to the knitted fabrics with different characteristics, and the step S6 of hot-pressing firmness, the pretreated knitted fabrics are flatly placed on a workbench of a hot-pressing device, and the hot-pressing device is started to conduct accurate hot-pressing operation on the lap joint portion. According to the invention, a traditional sewing and overlocking process is replaced by a hot-pressing lap joint process, so that the production efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of knitted fabric processing, in particular to a knitted fabric hot pressing overlapping process. Background Art

[0002] In the field of knitted fabric processing, how to achieve effective connection of fabrics and ensure the quality of finished products and production efficiency has long been an important topic of concern. As a fabric connection method, hot pressing overlap is of great significance for improving the performance and production efficiency of knitted fabric products. A good hot pressing overlap process can not only meet the needs of large-scale production, but also improve the quality of knitted products in terms of pattern, durability and aesthetics.

[0003] At present, sewing and overlocking is a relatively traditional and commonly used process in the splicing of knitted fabrics. This process relies on manually operated sewing machines, and the operator needs to carefully overlock the knitted fabric line by line. For example, when making an ordinary knitted top, sewing and overlocking usually takes 15-25 minutes. In the scenario of large-scale production, this process is widely used in the production of various types of knitted garments.

[0004] However, the traditional sewing and overlocking process has many technical defects. From the perspective of production efficiency, its process is cumbersome, requiring a lot of manpower and time, and is easily disturbed by factors such as manual operation, thread replacement, and sewing machine failure, which seriously affects the production progress and is difficult to adapt to modern large-scale and high-efficiency production needs. In terms of fabric pattern, due to the tension of the thread, the fabric, especially the thin and elastic knitted fabric, is prone to deformation after sewing and overlocking, resulting in the reduction of the size of the neckline, cuffs and other parts, which damages the stability and dimensional accuracy of the garment pattern. In terms of durability, the edges of the sewing and overlocking are prone to unthreading and breaking at the stitching when the fabric is stretched. Especially in sports knitted garments, frequent stretching will make this problem more prominent and shorten the service life of the garment. In terms of aesthetics, the obvious stitches left by sewing and overlocking cannot meet the requirements of high-end knitted garments for the exquisite appearance, limiting the competitiveness of the product in the high-end market. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a knitted fabric hot-pressing overlapping process, which solves many defects of the traditional sewing and overlocking process. Through the precise control of the hot-pressing parameters and the careful design of the device structure, it is ensured that the edges of the knitted fabric can be firmly and reliably overlapped. At the same time, it is ensured that the fabric after hot-pressing can maintain good elasticity, soft texture and original physical properties to the greatest extent, thereby comprehensively improving the overall quality of the garment and meeting the urgent market demand for high-quality knitted products.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A knitted fabric hot pressing overlapping process, comprising the following steps:

[0007] S1. Fabric cleaning: First, use mild detergent and clean water to deeply clean it and completely remove surface impurities;

[0008] S2. Ironing and leveling: Use professional ironing equipment to iron the fabric with precise temperature and pressure control, and according to design requirements, use precise measuring tools to carefully measure and accurately mark the parts of the fabric that need to be hot-pressed and overlapped, and strictly determine the overlap width to 7-10mm;

[0009] S3. Ultrasonic gluing: The gluing operation is performed by using equipment. During the operation, the edges to be glued are cut and the seams are uniform. At the same time, according to the material characteristics of the knitted fabric, the glue strip with good compatibility and bonding performance is accurately matched;

[0010] S4. Machine collage: Use a collage machine equipped with a high-precision positioning device to accurately align and overlap the edges that need to be overlapped;

[0011] S5. Setting of hot pressing parameters: There are many kinds of knitted fabrics, and their materials, thickness and elastic properties are significantly different. For knitted fabrics with different characteristics, the hot pressing temperature, pressure and time need to be specifically adjusted. The hot pressing temperature needs to be accurately controlled between 140℃-180℃, the hot pressing pressure is set to 2.5-5kg, and the hot pressing time can be flexibly adjusted between 15-25 seconds according to the specific characteristics of the fabric;

[0012] S6. Firm hot pressing: Place the pre-treated knitted fabric flat on the workbench of the hot pressing device, start the hot pressing device to perform precise hot pressing operation on the overlapping parts. Advanced temperature and pressure sensors are installed inside the hot pressing device. During the hot pressing process, these sensors are responsible for real-time and accurate monitoring and feedback of hot pressing parameters;

[0013] S7. Cooling and shaping: After the hot pressing is completed, the hot pressing part needs to be cooled and shaped in time to ensure the stability of the hot pressing effect. According to the production scale and actual needs, natural cooling or air cooling can be selected;

[0014] S8. Quality inspection: Conduct strict and comprehensive quality inspection on the hot-pressed overlap parts, using a combination of manual visual inspection and instrument inspection. Any unqualified parts found during the inspection will be repaired or re-hot-pressed in a timely manner.

[0015] Preferably, the precise temperature and pressure control is as follows: the ironing temperature should be controlled between 140° C. and 160° C., and the pressure should be set to 1.5-2.5 kg.

[0016] Preferably, the precise measuring tools include: a high-precision steel ruler, a laser rangefinder and an electronic digital caliper.

[0017] Preferably, the adopted equipment is specifically: adopting an ultrasonic gluing machine to perform the gluing operation, and using an ultrasonic cutting wheel to cut the edge that needs to be glued.

[0018] Preferably, the overlapping edge portions are precisely aligned and overlap by 7-10 mm.

[0019] Preferably, the hot pressing temperature, pressure and time all require specific adjustments, including: thicker wool knitted fabrics, due to their dense fiber structure, require higher pressure and longer hot pressing time, usually at a temperature close to 170-180°C, a pressure of 4-5kg and a hot pressing time of 20-25 seconds.

[0020] Preferably, the hot pressing temperature, pressure and time all need to be specifically adjusted, and also include: thinner silk knitted fabrics, due to their light texture and fine fibers, are hot pressed at 140-145°C, 2-3.5kg pressure and 12-18 seconds.

[0021] Preferably, the hot pressing parameters and time of the hot pressing device are specifically: hot pressing temperature 140-160° C., pressure 2.5-3.5 kg and time 10-25 s.

[0022] Preferably, the method of combining manual visual inspection with instrument inspection includes: using a magnifying glass to carefully check whether there are tiny bubbles, and using a tensile tester to accurately detect the firmness of the overlap.

[0023] A knitted fabric hot-pressing overlapping device comprises an ultrasonic gluing machine, wherein the ultrasonic gluing machine is provided with a feeding tray, a glue guiding groove is provided on the ultrasonic gluing machine, and an ultrasonic cutting wheel is provided at the bottom of the ultrasonic gluing machine.

[0024] The present invention provides a knitted fabric hot pressing overlapping process, which has the following beneficial effects:

[0025] 1. The present invention achieves significant improvement in production efficiency by adopting a hot-pressing lap joint process to replace the traditional sewing and overlocking process. The traditional sewing and overlocking process relies on manually operated sewing machines to perform stitching processes one by one, which is not only time-consuming, but also easily interrupted by problems such as thread replacement and sewing machine failure. The hot-pressing lap joint process of the present invention can be completed in one go, without the need for cumbersome stitching operations, greatly shortening the processing time.

[0026] 2. The present invention combines knitted fabric fibers at the molecular level through heat pressing, which effectively enhances the firmness of the connection parts. During the stretching process of knitted fabrics, the traditional sewing hemming is just a simple sewing of the fabric edge, and the stitches are easy to break, while the hot pressing overlap of the present invention can resist the tensile stress.

[0027] 3. The present invention avoids obvious damage to the fiber structure of the knitted fabric by accurately controlling the hot pressing parameters, thereby maintaining the good elasticity and texture of the fabric.

[0028] 4. The present invention uses a hot-pressing lap joint process to make the edges of knitted fabrics smooth and without any streaks, which significantly enhances the aesthetics. The obvious streaks left by traditional sewing and overlocking will affect the overall aesthetics of high-end knitted clothing, while the hot-pressing lap joint process of the present invention makes the appearance of the finished garment more refined and concise, meeting the strict requirements of high-end knitted clothing for appearance quality.

[0029] 5. The present invention has good versatility and adaptability by designing a hot-pressing overlapping process and device suitable for knitted fabrics of various materials, thicknesses and elasticities. Whether it is natural fiber knitted fabrics such as pure cotton, wool, silk, or synthetic fiber knitted fabrics such as polyester fiber and spandex, whether it is thick winter knitted fabrics or thin summer knitted fabrics, the process and device of the present invention can be used for processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a process flow chart of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall structure of the knitted fabric 1CM hot-pressed overlap of the present invention;

[0032] Figure 3 This is a schematic diagram of ultrasonic gluing in the present invention;

[0033] Figure 4 It is a top view schematic diagram of the effect after the machines are overlapped in the present invention;

[0034] Figure 5 It is a front view schematic diagram of the effect after the machines in the present invention are overlapped.

[0035] Among them, 1. Ultrasonic gluing machine; 2. Feeding tray; 3. Glue guide groove; 4. Ultrasonic cutting wheel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Please see attached Figure 1 -Attached Figure 5 The embodiment of the present invention provides a knitted fabric hot pressing overlapping process, comprising the following steps:

[0038] S1. Fabric cleaning: First, use mild detergent and clean water to deeply clean it, thoroughly remove surface impurities and ensure the cleanliness of the fabric;

[0039] S2. Ironing and leveling: Use professional ironing equipment to iron the fabric with precise temperature and pressure control to make the fabric surface smooth and ideal. The precise temperature and pressure control is as follows: the ironing temperature should be controlled between 140℃-160℃, and the pressure should be set to 1.5-2.5kg;

[0040] According to the design requirements, precise measuring tools are used to carefully measure and accurately mark the parts of the fabric that need to be hot-pressed and overlapped, and the overlap width is strictly determined to be 7-10mm. This optimal width setting, which has been verified by a large number of experiments, can meet the aesthetic requirements to the greatest extent on the basis of ensuring a firm overlap, and achieve a perfect balance between functionality and aesthetics. The precise measuring tools used include: high-precision steel rulers, laser rangefinders and electronic digital calipers;

[0041] S3. Ultrasonic gluing: The gluing operation is performed by using an advanced ultrasonic gluing machine 1, which has a high-precision gluing position control function. During the operation, the edge to be glued is cut by the ultrasonic cutting wheel 4, and the seam position is uniform, which effectively ensures that the fabric will not have loose edges. At the same time, the selection of glue strips is very important. According to the material characteristics of the knitted fabric, the glue strips with good compatibility and bonding performance must be accurately matched to ensure the stability and reliability of the gluing effect. According to the material characteristics of the knitted fabric, the glue strips with good compatibility and bonding performance are precisely matched as follows:

[0042] Pure cotton knitted fabric: Pure cotton fabric has the characteristics of strong moisture absorption and good air permeability. You should choose water-based polyurethane adhesive strips, which have good flexibility and air permeability and excellent compatibility with pure cotton fabrics. It can be firmly bonded to pure cotton fabrics without affecting the moisture absorption and air permeability of the fabrics, and can still maintain a good bonding effect after washing;

[0043] Polyester blended knitted fabrics: Since the chemical properties of polyester fibers are relatively stable, blended fabrics have good heat resistance and abrasion resistance. Hot melt adhesive strips can be used, the main component of which is ethylene-vinyl acetate copolymer (EVA). This adhesive strip can quickly melt and penetrate into the fabric fiber when heated, and form a strong bond after cooling. At the same time, hot melt adhesive strips have good washability and chemical corrosion resistance, and can adapt to the characteristics of blended fabrics;

[0044] Wool knitted fabric: Wool fabric fibers are relatively fragile, so you need to choose a soft and elastic rubber strip, such as a rubber strip. This type of strip can provide sufficient elasticity when bonding wool fabrics to avoid cracking at the bonding point due to the expansion and contraction of the fabric. At the same time, rubber strips cause less damage to wool fibers and can ensure the original performance of wool fabrics;

[0045] Silk knitted fabric: Silk fabric is thin and delicate, and has high requirements for adhesive strips. Solvent-based acrylic adhesive strips should be selected. This type of adhesive strip has good transparency and bonding strength, and can achieve a firm bond without affecting the beauty of the silk fabric. At the same time, solvent-based acrylic adhesive strips dry quickly, which can improve production efficiency;

[0046] At the same time, when selecting the adhesive strip, the width and thickness of the adhesive strip should also be considered, which should match the thickness of the fabric and the hot pressing overlap width. Generally speaking, the width of the adhesive strip should be 1-2mm narrower than the hot pressing overlap width, and the thickness should be selected between 0.1-0.3mm according to the thickness of the fabric. Before using the ultrasonic glue machine to glue, the quality of the adhesive strip should be inspected to ensure that it is free of impurities and bubbles to ensure the stability and reliability of the gluing effect;

[0047] S4. Machine collage: Use a collage machine equipped with a high-precision positioning device to accurately align the edges that need to be overlapped and overlap them by 7-10mm. The collage machine uses advanced overlapping positioning technology to ensure that there is no glue leakage or empty edges. Just like the precise jigsaw puzzle process, every link is strictly controlled. Any slight deviation may have an adverse effect on the final hot pressing effect, thereby ensuring the accuracy and stability of the collage;

[0048] S5. Setting of hot pressing parameters: There are many kinds of knitted fabrics, and their materials, thickness and elastic properties are significantly different, including: pure cotton knitted fabrics and polyester fiber blended knitted fabrics, which show obvious differences in heat reaction and pressure bearing ability. For knitted fabrics with different characteristics, the hot pressing temperature needs to be precisely controlled between 140℃-180℃, the hot pressing pressure is set to 2.5-5kg, and the hot pressing time is flexibly adjusted between 15-25 seconds according to the specific characteristics of the fabric. Specifically, thicker wool knitted fabrics require higher pressure and longer hot pressing time due to their compact fiber structure. Generally, the ideal heat pressing effect can be achieved at a temperature of 170-180℃, a pressure of 4-5kg and a heat pressing time of 20-25 seconds; while the thinner silk knitted fabric, due to its light texture and fine fiber, can achieve the best heat pressing state at 140-145℃, a pressure of 2-3.5kg and a heat pressing time of 12-18 seconds. Through such precise parameter control, it can ensure that the knitted fabric can achieve a firm overlap effect during the heat pressing process, and can also avoid damage to its original performance due to overheating or excessive pressure to the greatest extent, effectively ensuring the quality of the fabric;

[0049] S6. Firm hot pressing: Place the pre-treated knitted fabric flat on the workbench of the hot pressing device, start the hot pressing device, and the hot pressing head performs precise hot pressing operations on the overlapping parts according to the set hot pressing temperature of 140-160℃, pressure of 2.5-3.5kg and time of 10-25s. Advanced temperature and pressure sensors are installed inside the hot pressing device. During the hot pressing process, these sensors are responsible for real-time and accurate monitoring and feedback of hot pressing parameters to ensure the stability and consistency of the hot pressing process. Specifically: when there is a slight fluctuation in temperature, the control system can respond quickly and adjust the heating power in time to keep the temperature within the set range, effectively ensuring the stability and reliability of the hot pressing quality;

[0050] S7. Cooling and shaping: After the hot pressing is completed, the hot pressing parts need to be cooled and shaped in time to ensure the stability of the hot pressing effect. According to the production scale and actual needs, natural cooling or air cooling can be selected. Natural cooling is suitable for small-batch production or situations where the cooling speed is not high. The hot pressing parts are gradually cooled by natural heat dissipation; air cooling is suitable for large-scale production scenarios. Through the high-efficiency fans installed near the hot pressing device, the hot pressing parts can be quickly cooled, significantly improving production efficiency;

[0051] S8. Quality Inspection: Conduct strict and comprehensive quality inspection on the hot-pressed overlap parts, using a combination of manual visual inspection and instrument inspection. For unqualified parts found during the inspection, repair or re-hot press treatment in a timely manner to ensure that each product meets high quality standards. The combination of manual visual inspection and instrument inspection includes: using a magnifying glass to carefully check for tiny bubbles, and using a tensile tester to accurately detect the firmness of the overlap.

[0052] A knitted fabric hot-pressing overlapping device comprises an ultrasonic gluing machine 1, wherein the ultrasonic gluing machine 1 is provided with a feeding tray 2, a glue guide groove 3 is provided on the ultrasonic gluing machine 1, and an ultrasonic cutting wheel 4 is provided at the bottom of the ultrasonic gluing machine 1.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A knitted fabric hot pressing overlapping process, characterized in that: The following steps are involved: S1. Fabric cleaning: First, use mild detergent and clean water to deeply clean it and completely remove surface impurities; S2. Ironing and leveling: Use professional ironing equipment to iron the fabric with precise temperature and pressure control, and according to design requirements, use precise measuring tools to carefully measure and accurately mark the parts of the fabric that need to be hot-pressed and overlapped, and strictly determine the overlap width to 7-10mm; S3. Ultrasonic gluing: The gluing operation is performed by using equipment. During the operation, the edges to be glued are cut and the seams are uniform. At the same time, according to the material characteristics of the knitted fabric, the glue strip with good compatibility and bonding performance is accurately matched; S4. Machine collage: Use a collage machine equipped with a high-precision positioning device to accurately align and overlap the edges that need to be overlapped; S5. Setting of hot pressing parameters: There are many kinds of knitted fabrics, and their materials, thickness and elastic properties are significantly different. For knitted fabrics with different characteristics, the hot pressing temperature, pressure and time need to be specifically adjusted. The hot pressing temperature needs to be accurately controlled between 140℃-180℃, the hot pressing pressure is set to 2.5-5kg, and the hot pressing time can be flexibly adjusted between 15-25 seconds according to the specific characteristics of the fabric; S6. Firm hot pressing: Place the pre-treated knitted fabric flat on the workbench of the hot pressing device, start the hot pressing device to perform precise hot pressing operation on the overlapping parts. Advanced temperature and pressure sensors are installed inside the hot pressing device. During the hot pressing process, these sensors are responsible for real-time and accurate monitoring and feedback of hot pressing parameters; S7. Cooling and shaping: After the hot pressing is completed, the hot pressing part needs to be cooled and shaped in time to ensure the stability of the hot pressing effect. According to the production scale and actual needs, natural cooling or air cooling can be selected; S8. Quality inspection: Conduct strict and comprehensive quality inspection on the hot-pressed overlap parts, using a combination of manual visual inspection and instrument inspection. Any unqualified parts found during the inspection will be repaired or re-hot-pressed in a timely manner.

2. A knitted fabric hot pressing overlapping process according to claim 1, characterized in that: In step S2, the precise temperature and pressure control is specifically as follows: the ironing temperature should be controlled between 140°C and 160°C, and the pressure should be set to 1.5-2.5kg.

3. The hot pressing overlapping process of knitted fabric according to claim 1 is characterized in that: In step S2, the precise measuring tools include: a high-precision steel ruler, a laser rangefinder and an electronic digital caliper.

4. The hot pressing overlapping process of knitted fabric according to claim 1 is characterized in that: In step S3, the equipment used is specifically: using an ultrasonic gluing machine (1) to perform the gluing operation, and using an ultrasonic cutting wheel (4) to cut the edge that needs to be glued.

5. The hot pressing overlapping process of knitted fabric according to claim 1 is characterized in that: Step S4, the overlapping edge parts are precisely aligned and overlapped by 7-10 mm.

6. A knitted fabric hot pressing overlapping process according to claim 1, characterized in that: In step S5, the hot pressing temperature, pressure and time all require specific adjustments, including: thicker wool knitted fabrics, due to their dense fiber structure, require higher pressure and longer hot pressing time, usually at a temperature close to 170-180°C, a pressure of 4-5kg and a hot pressing time of 20-25 seconds.

7. The hot pressing overlapping process of knitted fabric according to claim 1 is characterized in that: In step S5, the hot pressing temperature, pressure and time all need to be specifically adjusted, including: thinner silk knitted fabrics, due to their light texture and fine fibers, are hot pressed at 140-145°C, 2-3.5kg pressure and 12-18 seconds.

8. The hot pressing overlapping process of knitted fabric according to claim 1 is characterized in that: In step S6, the hot pressing parameters and time of the hot pressing device are specifically: hot pressing temperature 140-160°C, pressure 2.5-3.5kg and time 10-25s.

9. The hot pressing overlapping process of knitted fabric according to claim 1, characterized in that: In step S8, the method of combining manual visual inspection with instrument inspection includes: using a magnifying glass to carefully check whether there are tiny bubbles, and using a tensile tester to accurately detect the firmness of the overlap.

10. A knitted fabric hot pressing overlapping device according to any one of claims 1 to 9, characterized in that: The ultrasonic gluing machine (1) comprises an ultrasonic gluing machine (1), wherein the ultrasonic gluing machine (1) is provided with a feeding tray (2), a glue guide groove (3) is provided on the ultrasonic gluing machine (1), and an ultrasonic cutting wheel (4) is provided at the bottom of the ultrasonic gluing machine (1).

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