CN104762774A - Dyeing and finishing process of all-cotton colored yarn - Google Patents

Abstract

The invention discloses a dyeing and finishing process of all-cotton colored yarns, which comprises the following process flows of: loosening a cylinder, filling yarn, pre-treating, dyeing cotton post-treating, dehydrating, drying, inspecting and packaging; the cotton dyeing process comprises the steps of immersing pretreated yarns into dye, controlling the dyeing temperature to be 50-60 ℃, dyeing for 20min, then heating to 80-90 ℃, and dyeing for 10min, wherein a pump is adopted to apply 0.6KPa pressure to a dye liquor during dyeing, so that the dye liquor is promoted to permeate from the inner layer to the outer layer of a bobbin, and uniform dyeing is realized. According to the dyeing and finishing process for the all-cotton dyed yarn disclosed by the invention, when the yarn is dyed, a certain external pressure is applied to the fuel barrel to promote the dye liquor to permeate from the inner layer to the outer layer of the barrel, so that uniform dyeing is realized.

Description

A dyeing and finishing process of cotton dyed yarn

technical field

The patent of the invention relates to a dyeing and finishing process, in particular to a dyeing and finishing process of cotton dyed yarn.

Background technique

Yarn-dyed fabric - called "first-dyed fabric" in Japan, refers to the process of dyeing yarn or filament first, and then using dyed yarn to weave. This kind of fabric is called "yarn-dyed fabric". Cloth factories are generally called dyeing and weaving factories, such as denim, and most shirt fabrics are yarn-dyed.

Among the varieties of yarn-dyed fabrics, those that use cotton yarns as warp and weft are called all-cotton yarn-dyed fabrics, which are woven by dyeing and finishing cotton-dyed yarns first, and the resulting fabrics are bright in color and not easy to fade.

Contents of the invention

Purpose of the invention: The purpose of the invention is to provide a dyeing and finishing process of cotton dyed yarn, which can achieve high dyeing efficiency and uniform dyeing by applying external pressure during dyeing.

The technical scheme adopted in the present invention: a dyeing and finishing process of cotton dyed yarn, the process flow is: loose tube - yarn loading - pretreatment - dyeing cotton - dyed cotton post treatment - dehydration - drying - inspection and packaging; The cotton dyeing process is to immerse the pre-treated yarn into the dye, control the dyeing temperature to 50-60°C for 20 minutes, then raise the temperature to 80-90°C and dye for 10 minutes. During the dyeing period, a pump is used to apply a pressure of 0.6KPa to the dyeing solution Promote the dye solution to penetrate from the inner layer of the tube to the outer layer, so as to achieve uniform dyeing.

Disperse dye (o.w.f.) x; acetic acid 1.2g/L; leveling agent 1.2g/L.

The pretreatment step is to immerse the yarn in a light alkaline solution and treat it at 100°C for 20 minutes to remove natural impurities and pigments in the yarn and improve the brightness and wet friction index of the yarn.

In the loosening step, the polyester yarn is wound on the plastic bobbin with a winding density of 0.36-0.38g/cm3, and the knots are ensured to be below 3mm.

The post-treatment of dyed cotton includes soaping, color fixing, and softening process, wherein the soaping process is to add the yarn after dyeing cotton into the soaping agent to carry out soaping and degreasing treatment at 100°C, and add solidifying after soaping is completed. The color agent is used for color fixing treatment, and then silicone oil is added for softening treatment.

The drying uses a radio frequency dryer to dry the yarn.

Beneficial effects: the invention discloses a dyeing and finishing process of cotton dyed yarn. When the yarn is dyed, a certain external pressure is added to the fuel barrel to promote the dyeing liquid to penetrate from the inner layer of the bobbin to the outer layer, thereby realizing uniform dyeing.

Detailed ways

Below in conjunction with specific embodiment, technical content of the present invention is elaborated:

A dyeing and finishing process of cotton dyed yarn disclosed by the present invention has a process flow of: loose tube - yarn loading - pretreatment - dyeing cotton - post dyeing cotton treatment - dehydration - drying - inspection and packaging.

Specifically: the loose tube is to wind the raw yarns with different specifications on the plastic bobbin according to the plan to form a loose tube with uniform density and good shape for dyeing. The winding density is required to be 0.36~0.38kg/cm3 , the appearance is well formed, and the joint head is kept below 3mm.

The yarn loading step is to load the loose yarn on the yarn rod of the sarong according to the plan, so that the loose yarn is connected with concave and convex on the yarn rod, and the top is locked with a steel disc and a lock to achieve complete sealing.

The pretreatment is mainly to remove natural impurities (cotton seed hulls, waxes, etc.) and pigments in the yarn, improve the whiteness and capillary effect of the yarn, and create conditions for dyeing processing. For friction and other indicators, the specific steps are to immerse the yarn in a light alkali solution and treat it at 100°C for 20 minutes.

The cotton dyeing process is to immerse the pre-treated yarn into the dye, control the dyeing temperature to 50-60°C for 20 minutes, then heat up to 80-90°C and then dye for 10 minutes. During the dyeing period, a pump is used to apply a pressure of 0.6KPa to the dyeing solution. , to promote the dye solution to penetrate from the inner layer of the package to the outer layer, so as to achieve uniform dyeing.

The post-treatment of dyed cotton includes soaping, color fixing and softening process, because after dyeing, there are a large amount of hydrolyzed and unreacted dyes remaining in the dyeing solution and on the surface of the yarn, these remaining dyes must be heated at high temperature by adding soaping agent. (100°C) to remove by washing with water. The function of soaping is to remove the floating color on the yarn and improve the brilliance of the color; The color will not fade during desizing and mercerizing. It is necessary to add a color-fixing agent to fix the color. The function of the color-fixing agent is to form a protective film on the surface of the yarn, so that the dye on the yarn will not fall off during the finishing process. The natural wax on the surface of the yarn is destroyed, the friction between the yarns increases, and the handle becomes hard. After the dyeing is completed, compounds such as silicone oil need to be added to the yarn for softening treatment to reduce the gap between the yarn and the yarn. The friction between them is convenient for winding and fabric unwinding.

The yarn after dyeing cotton is sent to the centrifugal dehydrator for high-speed dehydration, and then the yarn is dried by a radio frequency dryer and then packaged. The radio frequency dryer is used here because the radio frequency dryer is used for drying. The principle of action is that the yarn passes through the current field formed by the upper and lower plates. In the current field, the water molecules in the yarn are accelerated by the action of the current field, and the friction between the molecules is intensified to produce The heat forms water vapor, and then the exhaust fan pumps the water vapor into the air to achieve the purpose of drying. The radio frequency dryer has the advantages of energy saving, high efficiency and low environmental pollution.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A dyeing and finishing process of cotton dyed yarn, characterized in that: its technological process is: loose tube - yarn loading - pretreatment - dyed cotton - dyed cotton post-treatment - dehydration - drying - inspection and packaging; wherein The cotton dyeing process is to immerse the pre-treated yarn into the dye, control the dyeing temperature at 50-60°C for 20 minutes, then raise the temperature to 80-90°C and then dye for 10 minutes. The dyeing liquid permeates from the inner layer of the package to the outer layer, so as to achieve uniform dyeing. 2. The dyeing and finishing process of cotton dyed yarn according to claim 1, characterized in that: the ratio of the dye and auxiliary agent is: disperse dye (o.w.f.) x; acetic acid 1.2g/L; leveling agent 1.2g/L. 3. The dyeing and finishing process of cotton dyed yarn according to claim 1, characterized in that: the pretreatment step is to immerse the yarn in a light alkali solution, and treat it at 100°C for 20 minutes to remove the yarn The natural impurities and pigments in the yarn can improve the brightness and wet friction index of the yarn. 4. The dyeing and finishing process of a kind of cotton dyed yarn according to claim 1, characterized in that: in the step of loosening the tube, the polyester yarn is wound on the plastic tube with a winding density of 0.36-0.38g/cm3 On the pipe, and make sure that the joint head is below 3mm. 5. The dyeing and finishing process of a kind of cotton dyed yarn according to claim 1, characterized in that: the post-treatment of dyed cotton comprises soaping, color fixation, and softening process, wherein the soaping process is the process of dyeing cotton. The yarn is added to the soaping agent for soaping and oil removal treatment at 100°C. After soaping, a color fixing agent is added for color fixing treatment, and then silicone oil is added for softening treatment. 6. The dyeing and finishing process of a kind of cotton dyed yarn according to claim 1, characterized in that: said drying adopts a radio frequency dryer to dry the yarn.