Small Twisting Machine

Companies equipped with the network of research and development centers, manufacturing, laboratory, manufacturing lines, sales training, sales and installation service and We can also undertake various kinds of processing business such as embroidery thread, knitting yarn, zipper, luggage lines etc according to clients’ requirement.

DT2016—Integrated automatic twisting machine, small and delicate, can be put in office area or experimental workshop for operation proofing.

It can extend spindles and length to use all types of spindles according to actual situation.

Suitable for twisting all kinds of chemical fiber filaments and spun.

Products: high-speed sewing yarn, embroidery thread, fishing net yarn, polypropylene thread, polyamide yarn etc.

FAQ

How to install and run the machine?

Our technician have installed the machine before shipping. For some small parts installation, we will send detail training video, user’s manual along with the machine. 95% customers can learn by themselves.

How can I do if the machine goes wrong?

If confronted with such problems, please contact us asap and do not try fix the machine by yourself or someone else. We will response within 24 hours as quick as we can to solve it for you.

Main technical date:

Dyeing reaches equilibrium in all stages of the dyeing process of disperse dyes. There will be disperse dyes in single crystal state to get rid of the bondage of dispersant and combine with other disperse dyes to form larger crystals (or recrystallization). Once the recrystallized crystals are large enough, dye spots or stains will be formed, which can improve the plasticity of fibers and help the dyeing process to be completed as soon as possible.

In addition, the solubility of disperse dyes in water is very low. The dyes in the dye solution need to be dispersed as suspension through a large number of dispersants in the dye bath when dyeing polyester fiber.

In order to achieve better dyeing effect, it is usually necessary to add a certain amount of dyeing aids.

The function of dyeing auxiliaries in dyeing process

a. Increase the solubility of disperse dyes appropriately:

b. To promote the adsorption of disperse dyes on the fiber surface:

c. Plasticize or increase the swelling degree of the fiber. Accelerate the diffusion speed of disperse dyes in the fiber:

d. Improve the disperse stability of dyes.

In general, the auxiliaries used in high temperature and high pressure dyeing of polyester fiber include the carrier for fiber plasticization, the surfactant for disperse dye solubilization or for dye suspension stabilization, etc., which play an important role in the dyeing of polyester fiber.

Cause analysis of color spots and spots

There are two kinds of color spots and spots in dyeing polyester knitted fabric with high temperature and high pressure dyeing machine.

One is the color spot and stain caused by the condensation of dye. It can be repaired or re dyed after stripping with repairing agent.

The other is the color spots and spots that are difficult to remove due to the oligomers produced in the fiber.

1. Causes of color spots and spots in oligomers

Oligomer, also known as oligomer, is a kind of low molecular compound with the same chemical structure as polyester fiber. It is a by-product of polyester spinning. Generally, polyester contains 1% - 3% oligomer. Most of the oligomer is a ring compound formed by three ethyl terephthalate. When the temperature is over 120 ℃, the oligomer can dissolve in the dye bath and crystallize out of the solution, and combine with the condensed dye.

When it is cooled, it will deposit on the surface of machinery or fabric to form defects such as color spots and color spots, while disperse dye dyeing is generally kept at 130 ℃ for about 30 minutes to ensure the dyeing depth and fastness.

The light color can be kept at 120 ℃ for 30 min. the dark color must be pretreated before dyeing.

In addition, dyeing in alkaline condition is also an effective way to solve oligomers.

2. The causes of color spots and spots caused by dye agglomeration

a. Pretreatment

It is generally believed that the pretreatment of cotton knitted fabric has a great influence on the dyeing quality, while the pretreatment of polyester is not paid enough attention. It is suspected that the operator is not in proper operation after the dyeing quality problem occurs. As a matter of fact, the byproducts of polyester in raw material production and the oil in weaving process are very easy to cause dyeing quality problems, such as color flower, color difference, color spot, color spot, etc., so it must be treated before dyeing. Select a proper oil remover to heat up to 90 ℃ and keep warm for 10 minutes, then wash with water.

b、 The choice of dyestuffs and auxiliaries

Improper selection of dyes

Generally, when dyed in dark color, the chance of thermal collision of dye particles increases under the condition of high temperature dyeing. The dye molecules are easy to re agglomerate and produce color spots. At the same time, the improper use of a large number of fillers in dyes will produce color spots.

Improper selection of additives

The dispersing agent with poor quality agglomerates on the surface of the fabric together with the impurities inside the fiber and the dye vat at high temperature, resulting in color spots and spots. Different ionic auxiliaries are easy to react with each other to form demulsification, thus forming precipitation on the fabric, resulting in color spots and spots.

3. Fabric gram quality and grey fabric capacity

When dyeing in the same dyeing machine, the knitted fabric with high quality is tight due to its structure. The dye is not easy to enter the fiber, and the knitted fabric with the weight of more than 300 kEz is more likely to produce color spots and spots than the thin and sparse knitted fabric with the weight of about 200g / m2. Too much grey cloth for cylinder matching. Cause the operation is not smooth, but also easy to produce color spots.

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