Color Characteristics Of Printed Fabrics

Printed fabrics should test the following aspects of color characteristics: how long the color will last (color fastness), the color effect of a dye covering another dye (wet cover wet or wet wet printing), color reproducibility (color matching).

Each feature is discussed below.

Color fastness

It is a surface treatment method for materials. In addition to thin fabrics, the dye commonly printed can rarely penetrate into the depth of fabric structure.

Washing or dry cleaning and subsequent rotary drying, as well as the wear and tear caused by daily use, often cause the fabric surface to fall off, so that the fabric surface becomes lighter or exposed to uncolored fibers, making the fabric fade.

Fabrics such as shirts, most everyday clothing and children's clothing materials, if they are yarn dyed or dyed instead of printed, will last longer.

Some materials, such as decorative fabrics or evening dresses, are not very different because they are not frequently used or cleaned, printed or dyed.

Because printing costs are relatively low, printing patterns that imitate dyed stripes or checked patterns are sometimes printed. For this reason, the color of this printed fabric is not durable.

Careful buyers and other textile related personnel usually check whether the pattern on the fabric is loom or printed.

Vertical stripe pattern can not be printed by manual screen or automatic flat screen, because when printing screen is replaced every time, it is difficult to match the pattern before matching.

Two. Wet cover of wet cover and wet cover

Wet hood drying

The second color is printed on the previously printed color when it has been properly dried or completely dried, and the second color is covered on the first color. The result shows only second colors.

Wet screen printing is usually printed only with manual screen.

Wet wet printing is printed on second colors when the first color is not dry.

When the fabric is still in the printing stage, the second color will be applied immediately after the first color printing.

After the first color is covered by second colors, the two colors are mixed to produce third colors.

These third colors are called overprint.

Therefore, two screen methods (manual screen or automatic flat screen) and drum method are used for wet printing of wet screen, and the print designer can create third colors.

Three, halftone (halftone)

Halftone is the same color in a pattern from a shallow and deep gradient.

In roller printing, halftone is obtained by gradually increasing or decreasing the depth of the copper cylinder.

Halftone is obtained by gradually increasing or decreasing mesh density at the screen pattern in rotary screen printing.

As for manual screen printing, automatic flat screen printing and heat pfer printing, the technology of changing mesh density has not been studied successfully, and halftone printing fabrics can not be produced.

Four. Printing proofing and color matching.

The coloring of dyed fabrics, sample formulation and conditions are discussed in the eighth chapter.

These problems and

Regulations apply to printed fabrics as well.

Before printing large quantities of printed fabrics, a few yards of sample cloth should first be printed to get the approval of the stylist designer or customer. This process is called proofing.

In many cases, for the printing workers, it is very important to match all the colors in the pattern, so in this case, a pattern is often repeated several times before being allowed to produce.

It may take 6 to 8 weeks to produce the first batch of screen plates and proofing. In the field of textile printing, the highly fashionable patterns change so fast that problems often arise.

However, a new technology that has recently been introduced into the market can save much time. It takes only a few hours to start printing drawings on paper and print samples on fabrics.

The new technology is the Encad digital textile system, which is made up of CAD computer aided design system and a machine that can print directly on the fabric through the computer output with accurate color ratio (see Figure 9 - 12).

Printing speed is about 13 minutes to produce 1 yards of cloth, or about 5 yards per hour.

The main advantage of the system is that the pattern changes and new samples can be directly implemented on the computer / printing machine system without the need for new screen printing.

Five. Best printing method

Which of the several commercial printing methods is best? There is no best way.

Each printing method is the best one for printing specific patterns and specific output printing methods. Some methods are completely inappropriate for certain patterns and specific output printing methods.