On Elastic Jeans and How to Avoid Losing Elasticity

The so-called elastic denim is that a certain percentage of elastic fiber is added to the weft in the production process of denim. When wearing, it will have a certain elasticity and feel more comfortable.In 1962, cone mills was the first factory in the United States to use and promote elastic denim. Legler (Italy) was the first factory to produce special denim in the late 1970s, although it was not very successful at that time.In 1978, the earliest elastic jeans were produced by Peter Golding, and Mustang began to produce elastic jeans in 1983. In 1980, Levi's, with the help of lauffenmuhle's elasthenim, began to launch women's stretch jeans in the UK. This initiative has received a good response in the UK, and other brands have begun to follow suit.

On Elastic Jeans and How to Avoid Losing Elasticity 1

Marks & Spencer is the second brand to launch elastic jeans, which uses Legler's denim series. In the next few years, probably 1983-1984, elastic fabrics and jeans in Europe flourished.In the 1990s, the use of lycra elastic fiber began to increase, and elastic denim continued to be popular. However, due to the popularity of pocket pants and non tight pants in the next decade, the use of elastic fabric gradually decreased. In 1998, some elements of fabrics began to regain popularity, which greatly promoted American manufacturers to produce elastic denim.The revival of super tight jeans in 2006 has become an inevitable trend to increase the output of elastic denim. A large number of contemporary boutique denim include Agave, rock & Republic, chip & pepper and gold sign. They all use modern elastic denim today. Therefore, denim manufacturers began to produce this kind of elastic denim. This kind of cloth has a natural appearance. The tights made by this kind of fabric can be used for both men and women.

Denim stretch specificationQ: What do 40d, 70D, 200D and 300D mean?A: 40d and 70D represent the specifications of spandex filament. 200D and 300D represent the specifications of weft raw materials.

Q: What does it mean if the weft specification has both 40d and 200D? What do 40 and 200 mean? The weft direction is 200D 40d polyester denim.A: Remember, the larger number in the front is the main polyester yarn, and the 40d or 70D behind is the spandex elastic yarn wrapped in the middle by polyester.High elastic denim fabric

The warp yarn of high elastic denim fabric uses air covered yarn or twist yarn of polyurethane fiber and polyester fiber. With the design of fabric process, the elongation performance is improved by 40% and the recovery performance after elongation is improved by 30% compared with previous commodities. At the same time, it reduces the tension when wearing, and can also prevent the deformation and knee bulging of high elastic denim fabric and maintain the close fitting effect. In addition, the dyeing and finishing process of the fabric is the same as that of general commodities, and does not damage the aging feeling of elastic jeans. The fabric weighs about 227 283 grams, and the colors are indigo, black and white for garment dyeing.

On Elastic Jeans and How to Avoid Losing Elasticity 2

Four side elastic denimThe fabric structure of four side elastic jeans is to use spandex elastic silk to give the fabric a certain elasticity. Generally, elastic fabrics containing spandex can be divided into warp elasticity, weft elasticity and warp weft two-way elasticity. Tetrahedral elastic cloth is both warp and weft elastic, usually its elastic elongation is 10% - 15%, and the content of spandex in the fabric is 3%.Why does elastic fiber spandex bifurcate?

1. Spandex belongs to chemical fiber, which is obtained by spinning and texturing. When spinning chemical fiber, several single fibers are usually combined together and then wound into rollers. In order to eliminate static electricity and increase the stability and closure of the tow, it is often oiled, that is, the process of adding an oil tanker in the silk road. The chemical fiber without oil will not only bifurcate, but also be easy to damage and fracture. In the post-processing, there will also be problems such as floating wire and insufficient strength, which is one of them.2. Machine package may be several chemical fibers wrapped together to make wrapping yarn. It is one of the uses of chemical fiber DTY yarn, such as spandex, nylon, or cotton thread. Static electricity will be generated by friction between them under the high-speed operation of rollers.Elimination methods:

1. It can increase the humidity of the processing workshop environment, which is generally controlled at about 60%.2. Analyze whether the purchased spandex is not oiled and contact the supplier for confirmation.3. Check whether your wrapping process is appropriate.

Cause analysis and improvement scheme of water washing bullet loss of denim fabricHigh elastic silk materials are becoming more and more common in denim fabrics, and the elasticity directly determines the progress of denim washing process. Elastic denim clothing is not only poor in quality and easy to lose elasticity, but also affected by many external factors. Elastic denim products often lose elasticity in the process of garment making and washing, which is mostly caused by the following problems:1. Generally, the drying temperature of denim fabric of elastic silk is required to be lower than 60 , and too high temperature will damage the elasticity. Therefore, when the denim is treated before washing, the elastic protector should be used, which can well prevent the damage to denim fabric caused by too low elasticity and appropriately reduce the risk of elastic breakage.

2. The cowboy clothing washing machine rotates too fast and the mechanical force is large, which will cause the fabric to lose elasticity. Therefore, try to shorten the time or soak it too soft, and maintain the appropriate machine speed and speed, so as to reduce the risk of breaking elasticity.3. When denim clothing is washed too soft, when the temperature of the water in the cylinder is too high or the time is too long, the fabric will degrade and eventually lead to fracture, making the fabric lose elasticity. Therefore, attention should be paid to controlling the appropriate water temperature.4. Due to the different formulations of softener and silicone oil by various auxiliary manufacturers, some softeners and silicone oil will damage the elasticity. Therefore, it is necessary to select the correct softener and ensure the appropriate dosage.

5. The last part is sewing. The needle used in the sewing process of denim clothing can be divided into manual needle, which is called hand sewing needle; Needle for sewing machine, called machine needle; And other needles, sewing needles or pins for marking. In the process of garment sewing, the most difficult thing to master is to sew fabrics with high elasticity, which is also difficult for sewing lathe masters, because too thick needle or poor sewing will lead to elastic fracture, blistering and deformation of spandex fabric. Therefore, for sewing elastic surface materials, round needle tip machine needles should be used, and special attention should be paid to not using too thick machine needles, To avoid a large number of fiber breakage.

Important tips on rinsing elastic denim and corresponding pH value:

When there are products to be rinsed, pay special attention to adjusting the pH value of the bleaching water. If there is too little NaOH (caustic soda, flake soda), it will lose elasticity due to the brittleness of the bleaching water; If there is too much caustic soda and the pH is too high, the ester bond in polyurethane will degrade and lose elasticity. Therefore, the optimal pH = 11-12 and must not exceed 12. At the same time, the temperature should not be too high to reduce the loss of effective spandex. The control temperature should be less than 45 .

The particularity of denim clothing style determines the particularity of its washing and dyeing process. Its production process includes fiber raw materials and spinning, pulp dyeing of denim yarn, finishing of denim fabric and so on. The raw materials and finishing methods of denim products are changing with each passing day, especially the development of various functional dye additives is leading denim products to personalization and functionalization.In order to improve the competitiveness of denim products and reduce the elastic loss of denim products after washing and dyeing processing, we must analyze the fibers and fabrics from the source, test various water washing and dye additives before production, set the best process, strengthen the operation management of front-line staff in production and find problems in time, so as to improve the product quality.

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