Cold Pad Batch Dyeing Process Of Bamboo Wool Cotton Knitted Fabric

The oven method is introduced.

For small samples, the cold pad batch dyeing time of the truck is determined to be 6 ~ h, the water glass content is 40 to 60g/L, and the soda ash consumption is 5 ~ 0g/L.

SNE orange, SNE scarlet and SNE blue were identified as three primary colors.

The results showed that dyeing bamboo / wool / cotton knitted fabric with this method had good color fastness, soft handle and drapability, and reduced sewage, energy saving and cost reduction.

The problems existing in dyeing are analyzed, the reasons are found, and solutions are put forward.

Bamboo fiber is a kind of bamboo fiber which is directly separated from bamboo by its unique technology.

Bamboo fiber belongs to cellulose fiber, but its structure is special. The cross section contains a large number of round holes, just like polyester fine denier profiled silk. There are many hollow tubular special-shaped fibers inside it. It has good drapability, abrasion resistance, high strength, soft, breathable, moisture absorption and antibacterial properties.

Bamboo fiber is a newly developed environment-friendly natural fiber with excellent wearability.

The knitted underwear fabrics made of bamboo fiber and wool and cotton are well received by customers.

Cold pad batch dyeing is a short process dyeing at room temperature. It is suitable for dyeing small batch and multi varieties, saving water, saving electricity, saving steam and reducing sewage discharge. Through experiments, the cold pad batch dyeing method of bamboo wool cotton knitted fabric has been determined, and dyes have been selected, and the dyeing conditions have been determined.

Materials and equipment, bamboo / wool / cotton knitted fabric (bamboo / wool / cotton 0/0/60, yarn linear density 5tex, surface density 0g/m), chelating dispersant DF-0, soda ash, hydrogen peroxide, SNE orange, SNE red, SNE blue, water glass, color fastness tester, cold pad batch dyeing machine.

Process flow, scouring and bleaching to cold pad batch dyeing.

Cold dyeing and small sample processing, small sample process: weigh materials, abrasives, auxiliaries, rolled cloth (one dip and one rolling).

Oven drying method: wrap fresh-keeping film, seal it and put it into oven (40 0min * or 50 60min *) to wash, soap wash (95 C, min) to iron.

Simulated on-site cold reactor method: room temperature cold reactor 6 to 4h to wash, hot water wash to soaping (95 C, min) to ironing.

Small sample operation requirements and matters needing attention: the standard solution of sodium silicate and soda ash must be sealed well: cold reactor sample, when the cloth is rolled, the fresh-keeping film is opened, the sample cloth is put on the fresh-keeping film, and the two ends of the plastic wrap are sealed, recording time and the ambient temperature at that time.

Type: fixed on G fabric.

The volume (mg) =CV/G, C are sample mass concentration (g/L), V is sample volume (mL), G is sample quality (g).

For dye selection, reactive dye cold pad batch dyeing requires that dye and alkali agent (soda ash and sodium silicate) should be mixed evenly in the dye bath before dyeing. The fabric is rolled and dyed and then rolled and placed at room temperature for 6 ~ H. Because reactive dyes are easy to hydrolyze under alkaline conditions, reactive dyes used for cold pad batch dyeing must be alkali resistant.

The experimental method of alkali stability of reactive dyes: take all kinds of reactive dyes with the same concentration of alkali agent, place the same time, then dye the fabric, and observe the color depth.

A large amount of practice has proved that polysulfone type reactive dyes are suitable for cold pad batch dyeing.

The properties of polysulfone based polybasic dyes of different manufacturers are shown in the table.

According to the experimental results and the actual operation, Jiangsu Shenxin SNE dyes and Colin dyes are widely used. The cold pad batch dyeing is stable and the technological conditions are easy to grasp. But the price of the Colin dye is high. Finally, the Jiangsu Shenxin SNE dye is selected.

The prescription of water glass dyeing prescription: SNE orange g/L, SNE scarlet 0g/L, SNE blue 7g/L, chelating dispersant DF-0g/L, sodium carbonate 0g/L.

Dyeing conditions: dyeing temperature 5~5 degrees, dyeing time 0h, vehicle speed 40m/min, rolling rate 65%.

The effect of water glass content on fixation rate is shown in table.

In cold pad batch dyeing, the amount of sodium silicate can not be less than 5mL/L, otherwise the fixation rate and edge color difference are not good. In order to achieve a good fixation rate, the final determination of the dosage of sodium silicate is 40 ~ 60mL/L.