Process Practice Of Rotary Screen Printing

First, check the positive and negative sides of the fabric when sewing the head. Cut the edges before weaving the edges, arrange the sides on the sides, and arrange the fabric after sewing with the edge machine to facilitate printing on the machine.

According to the performance of knitted printing fabric containing spandex, choose the heat shrinkable resin or paste paste cloth, adjust the suction suction device, the edge stripper, the vacuum cleaner, adjust the tension of the cloth, the tension of the knitted fabric with spandex is minimum, and the width of the cloth is reduced by 3% to 5%, and turn off the vacuum cleaner.

When the cloth is inserted, the tension is uniform, the cloth surface is smooth, and the weft deviation is prevented.

Spandex Knitted fabric circular screen printing, because of the elasticity of its fabric is affected not only by the tension of cloth, but also by the speed of the car.

Therefore, even if the cloth tension is almost not, the instantaneous tension due to the change of speed will cause the fabric to stretch differently and extend to a certain proportion.

Therefore,

The printing speed of rotary screen printing is more suitable than that of 30 ~ 40m/min. Too fast speed is not conducive to product quality control.

Moreover, there is a certain restriction on the return pattern of rotary screen printing, which is different from flat screen printing that the return position of rotary screen printing is fixed length.

The speed must be strictly controlled according to the proportion that has been enlarged. Otherwise, due to the variability of the size of the knitted fabric, the size and shape of the printed products are even different from those of the products. Therefore, the printing speed has been determined in the production of the round net, and it can not be changed in any future operation.

The selection of pressure and magnetic rod (scraper) for rotary screen printing.

When printing, the size of the pulp in the net tube is medium and low, and the thin stem and small area should be kept less.

For each time two to three hours, the printing is done to check the printing quality.

A white cloth can also be used in a certain amount of grey cloth to check the quality of the printing and the quality of the round screen regularly.

According to the amount of fabric needed, control and select pressure and magnetic rod (scraper), choose the magnetic rod 10 or L2, the scraper 45 to 50cm, choose the magnetic rod 15~20 and the scraper 50cm, and select the magnetic rod 25 and the scraper 55cm.

The size of the pressure varies from stem to block, and from small to large.

In short, according to the performance of rotary screen printing machine, adjust the slurry volume and penetration effect.

Rotary screen printing is difficult to see in dark cloth because of its rapidness and carving printing. Therefore, the discharge printing of three sets of color is usually carried out on flat screen printing machine. Only one or two sets of carvings without color accuracy can be printed on rotary screen.

Formulation.

The printing process prescription depends on the dye performance of different fabrics.

For example, direct printing of reactive dyes is more important than prescription sodium alginate, reactive dyes, caustic soda (soda or soda ash) and hygroscopic agent (urea).

The consumption of alkali and hygroscopic agents is very important, which is related to the ability and effect of dyes and coloring fibers.

Therefore, according to the different fabrics, the amount of additives is also different.

For one thing, cotton or mercerized cotton is more than amorphous areas such as cotton, Moir and bamboo fiber. Dye easily enters the fiber, especially the amount of urea 3% to 6%. And the crystalline area of cotton, Moir and bamboo fiber is much more than that of cotton fiber. Therefore, the dosage of urine is up to 25%, so that the moisture needed for steaming can be absorbed to achieve normal hair color and good color.

The reactive dyes of K type are relatively limited in the coloring ability of modal fiber, and can not reach the intensity of color. P or PX reactive dyes can achieve good coloring properties.