charge on the surface of flax fabric retards diffusion of the natural
dye into the fibers. Adding salt into the dye bath decreases the
surface charge of the fabric, thus markedly improving dyeing rate
with natural dyes. Table 5 shows the effects of salt concentration on
K/S value, dye exhaustion rate and colorimetric parameters of the
dyed fabrics. It is clearly indicates that the K/S value was higher in
the presence than in the absence of salt. With increasing salt concentration,
the K/S value of fabric increased. Meanwhile, the color
coordinate value and dye uptake of samples improved significantly
in the presence of salt.
The original pH of the dye solution was 4. Clearly, the K/S value
reached the maximum value at this pH, as shown in table 6. It is also
shown in Table 6 that the dyeability of the fabrics improved when
the pH values increased from 3 to 4, but started to gradually decline
with further increase to pH 11. The effect of dye-bath pH can be
attributed to the correlation between dye structure and flax fibers.
Since the dye-bath pH changed, the pigment structure and the
charge effect on the fabric surface changed accordingly. Results of
charge on the surface of flax fabric retards diffusion of the natural
dye into the fibers. Adding salt into the dye bath decreases the
surface charge of the fabric, thus markedly improving dyeing rate
with natural dyes. Table 5 shows the effects of salt concentration on
K/S value, dye exhaustion rate and colorimetric parameters of the
dyed fabrics. It is clearly indicates that the K/S value was higher in
the presence than in the absence of salt. With increasing salt concentration,
the K/S value of fabric increased. Meanwhile, the color
coordinate value and dye uptake of samples improved significantly
in the presence of salt.
The original pH of the dye solution was 4. Clearly, the K/S value
reached the maximum value at this pH, as shown in table 6. It is also
shown in Table 6 that the dyeability of the fabrics improved when
the pH values increased from 3 to 4, but started to gradually decline
with further increase to pH 11. The effect of dye-bath pH can be
attributed to the correlation between dye structure and flax fibers.
Since the dye-bath pH changed, the pigment structure and the
charge effect on the fabric surface changed accordingly. Results of
การแปล กรุณารอสักครู่..
