A method for manufacturing a high-elasticity mark-free brief

Abstract

This invention provides a method for preparing high-elasticity seamless underwear, comprising the following steps: S1. Raw material preparation: selecting highly elastic pant body pieces and elastic overlock strips, and preparing environmentally friendly elastic adhesive; S2. Adhesive application: using precision adhesive application equipment, uniformly applying the environmentally friendly elastic adhesive to the edge composite area of ​​the pant body pieces and the bonding surface of the elastic overlock strip; S3. Composite molding: joining the pant body pieces together, attaching the elastic overlock strip to the waistband and hem, and then applying pressure to mold. The method for preparing high-elasticity seamless underwear provided by this invention achieves the composite of the pant body pieces and elastic overlock strips through a specific adhesive application process, enabling the resulting pant body to have more than twice the stretch of conventional methods, and after stretching, it can completely shrink back to its original shape 1:1, greatly improving the wearing comfort and durability of the underwear.

Description

Technical Field

[0001] This invention relates to the field of garment manufacturing technology, specifically to a method for preparing highly elastic seamless underwear. Background Technology

[0002] In the apparel manufacturing industry, the comfort of trousers has always been one of the core indicators that consumers pay attention to, and the elasticity of the trousers is a key factor affecting wearing comfort. Traditional trousers are usually made by sewing the trouser body pieces together with the overlock strip, or by using a common adhesive bonding process. However, these conventional methods have obvious drawbacks: sewing creates a relatively hard seam area at the joint, which not only affects the overall elasticity of the trousers, but also easily causes friction and discomfort to the skin during wear; the glue used in the common adhesive bonding process is unevenly distributed, and the glue itself has limited elasticity, resulting in limited stretching of the trousers, usually only reaching 1.2-1.5 times the original size, and it is difficult to completely shrink back to its original shape after stretching. After repeated wear and washing, the trousers are prone to deformation and loosening, seriously affecting the wearing experience and the lifespan of the trousers.

[0003] As consumers increasingly demand comfort and durability in clothing, the market urgently needs a trouser manufacturing technology that can significantly improve the elasticity of the trousers while ensuring that they can fully shrink back after stretching. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a method for preparing high-elasticity seamless underwear. By using a specific adhesive application process to combine the pant body panels with elastic overlock strips, the resulting pant body can achieve a stretch of more than twice that of conventional methods. Moreover, after stretching, it can completely shrink back to its original shape 1:1, greatly improving the wearing comfort and durability of the pant.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for preparing highly elastic seamless underwear includes the following steps:

[0007] S1. Raw material preparation: Select trouser body pieces with high elasticity and elastic overlock strips, and prepare environmentally friendly elastic glue;

[0008] S2. Glue application: Using precision glue application equipment, environmentally friendly elastic glue is evenly applied to the edge composite area of ​​the trouser body pieces and the bonding surface of the elastic overlock strip.

[0009] S3. Composite molding: The trouser body pieces are joined together, and elastic overlock strips are attached to the waistband and hem, and then pressure is applied to form the trousers.

[0010] Furthermore, in step S1, the trouser body panels are made of a cotton-spandex blend fabric with a spandex content of 15-30%, which combines good moisture absorption and elasticity; the elastic overlock strip is made of polyurethane elastic tape with a thickness of 0.1-0.3mm and an elongation at break of not less than 500% to ensure that the overlock strip itself has excellent elasticity. The elastic adhesive has a tensile breaking rate ≥300% and good washability.

[0011] Furthermore, in step S2, the thickness of the elastic adhesive is controlled at 0.05-0.1mm, and the moving speed of the adhesive application equipment is controlled at 5-10cm / s to ensure the uniformity and stability of the adhesive application.

[0012] Furthermore, in step S3, a composite pressure roller is used to roll the bonding area, with the rolling pressure controlled at 0.2-0.5 MPa and the rolling speed consistent with the adhesive application speed. This ensures that the trouser body panels and the elastic overlock strip are tightly bonded, allowing the adhesive to fully penetrate the fiber gaps between the two. The bonded trouser body panels are then placed in an environment with a temperature of 25-30℃ and a relative humidity of 40-60% for curing, which takes 12-24 hours to allow the adhesive to fully cure and form a strong and highly elastic adhesive layer.

[0013] Furthermore, it also includes S4. Post-molding treatment, which involves trimming the composite trousers to remove excess overlock strips and rough edges, followed by ironing to make the surface of the trousers smooth, while further enhancing the adhesive strength and elasticity.

[0014] Furthermore, in step S4, the ironing temperature is controlled at 120-150℃, and the ironing time is 10-15 seconds.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] 1. Significantly improves elasticity: By using a specific adhesive application process and highly elastic raw materials, the stretch of the pants produced by this invention can be more than twice that of conventional methods, and it can achieve a 1:1 complete shrinkage, which greatly improves the wearing comfort of the pants, allowing the pants to better fit the curves of the human body and adapt to various movements of the human body without producing a feeling of tightness or restriction.

[0017] 2. Enhanced durability: The environmentally friendly elastic adhesive used in this invention has excellent water resistance and bonding strength. After repeated wear and washing, the composite parts of the pants can still maintain a firm bond without problems such as delamination or deformation, effectively extending the service life of the pants.

[0018] 3. Enhanced Wearing Experience: Thanks to the excellent elasticity and shrinkage properties of the pants, they stretch and shrink freely with the body's movements during exercise, squatting, and other vigorous activities, preventing friction and pressure on the skin and significantly improving comfort and freedom of movement. At the same time, the pants are less prone to loosening or deformation, maintaining a consistently good appearance.

[0019] 4. Environmentally Friendly and Efficient Process: Compared to traditional sewing, the adhesive application process used in this invention eliminates the need for sewing threads, reducing material consumption and waste generation. The selected environmentally friendly elastic adhesive contains no harmful substances and meets environmental protection requirements. Furthermore, the adhesive application process has high production efficiency, enabling large-scale industrial production. Detailed Implementation

[0020] Numerous specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can be practiced in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Example 1

[0022] A method for preparing highly elastic seamless underwear includes the following steps:

[0023] S1. Raw Material Preparation

[0024] A cotton-spandex blend fabric with 20% spandex content was selected as the trouser body fabric, and a 0.2mm thick polyurethane elastic band was used as the elastic overlock strip with an elongation at break of 550%. An environmentally friendly polyurethane elastic adhesive with a tensile breaking rate of 350% was selected, and the curing time of the adhesive at room temperature was 12 minutes.

[0025] S2. Glue application treatment

[0026] Wipe the edges of the trouser body panels and the bonding surfaces of the elastic overlock strips clean with a clean cotton cloth to remove surface impurities. Using a precision glue application device, apply glue evenly to the above areas to a thickness of 0.08mm, with the device moving at a speed of 8cm / s.

[0027] S3. Composite Molding

[0028] After applying the adhesive, immediately attach the elastic overlock strip to the adhesive-coated area of ​​the trouser body piece. Use a composite roller to roll it at a pressure of 0.3 MPa and a rolling speed of 8 cm / s. Then, place the composite trouser body piece in an environment with a temperature of 28℃ and a relative humidity of 50% to cure for 20 hours.

[0029] S4. Post-molding processing

[0030] After curing, excess overlock strips and rough edges are trimmed, and the garment is ironed at 130℃ for 12 seconds before final quality inspection. Testing showed that the trousers produced in this embodiment have an elongation of 2.8 times their original size, and can completely shrink back to their original shape after stretching. After 100 stretching cycles and 100 washes, the elasticity and appearance of the trousers show no significant change.

[0031] Example 2

[0032] A method for preparing highly elastic seamless underwear includes the following steps:

[0033] S1. Raw Material Preparation

[0034] A cotton-spandex blend fabric with 25% spandex content was selected as the trouser body fabric, and a 0.15mm thick polyurethane elastic band was used as the elastic overlock strip with an elongation at break of 600%. An environmentally friendly polyurethane elastic adhesive with a tensile breaking rate of 320% was selected, and the curing time of the adhesive at room temperature was 10 minutes.

[0035] S2. Glue application treatment

[0036] Clean the edges of the trouser body panels and the bonding surfaces of the elastic overlock strips with alcohol to remove surface impurities. Using a precision glue application device, evenly apply glue to the above areas to a thickness of 0.06mm, at a speed of 10cm / s.

[0037] S3. Composite Molding

[0038] After applying the adhesive, immediately attach the elastic overlock strip to the adhesive-coated area of ​​the trouser body piece, and roll it using a composite roller at a pressure of 0.4 MPa and a rolling speed of 10 cm / s. Then, place the composite trouser body piece in an environment with a temperature of 30℃ and a relative humidity of 45% to cure for 18 hours.

[0039] S4. Post-molding processing

[0040] After curing, excess overlock strips and rough edges are trimmed, and the garment is ironed at 140℃ for 10 seconds before final quality inspection. Testing showed that the trousers produced in this embodiment have an elongation of 2.9 times their original size, and can completely shrink back to their original shape after stretching. After 100 stretching cycles and 100 washes, the elasticity and appearance of the trousers remain excellent.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing high-elasticity seamless underwear, characterized in that, Includes the following steps: S1. Raw material preparation: Select trouser body pieces with high elasticity and elastic overlock strips, and prepare environmentally friendly elastic glue; S2. Glue application: Using precision glue application equipment, environmentally friendly elastic glue is evenly applied to the edge composite area of ​​the trouser body pieces and the bonding surface of the elastic overlock strip. S3. Composite molding: The trouser body pieces are joined together, and elastic overlock strips are attached to the waistband and hem, and then pressure is applied to form the trousers.

2. The method for preparing high-elasticity seamless underwear according to claim 1, characterized in that: In step S1, the trouser body is made of cotton-spandex blended fabric with a spandex content of 15-30%, and the elastic overlock strip is made of polyurethane elastic tape with a thickness of 0.1-0.3mm, with an elongation at break of not less than 500%, and the elastic adhesive has a tensile breaking rate of ≥300%.

3. The method for preparing high-elasticity seamless underwear according to claim 2, characterized in that: In step S2, the thickness of the elastic adhesive coating is controlled at 0.05-0.1mm, and the moving speed of the adhesive application equipment is controlled at 5-10cm / s.

4. The method for preparing high-elasticity seamless underwear according to claim 3, characterized in that: In step S3, the bonding area is rolled using a composite pressure roller, with the rolling pressure controlled at 0.2-0.5 MPa. The laminated trouser body pieces are then placed in an environment with a temperature of 25-30℃ and a relative humidity of 40-60% for curing, with a curing time of 12-24 hours.

5. The method for preparing high-elasticity seamless underwear according to any one of claims 1-4, characterized in that, Also includes: S4. Post-forming treatment: Trim the composited trousers to remove excess overlock strips and raw edges, and then iron them.

6. The method for preparing high-elasticity seamless underwear according to claim 5, characterized in that: In step S4, the ironing temperature is controlled at 120-150℃, and the ironing time is 10-15 seconds.