Bleached fiber product production method, apparatus to be used therefor, and bleached fiber product produced thereby
First Claim
1. A bleached fiber product production method for bleaching a fiber product mainly including at least one of a natural fiber and a regenerated fiber to produce a bleached fiber product, the method comprising the steps of:
- loading the fiber product into a lidded hermetic vessel serving as a treatment vessel;
forcibly circulating a treatment liquid in contact with the fiber product loaded in the treatment vessel through a forcible circulation pipe attached to the treatment vessel and provided with a circulation pump to thereby wet the fiber product;
supplying an ozone gas into the treatment liquid in a minute bubble form via a gas-liquid mixing/ejecting means, the gas-liquid mixing/ejecting means being selected from an ejector, a vortex pump and a mixing pump, to provide an ozone-containing liquid, and forcibly circulating the ozone-containing liquid in contact with the wetted fiber product through the forcible circulation pipe to thereby bleach the fiber product;
forcibly circulating an ozone decomposing chemical agent liquid in contact with the bleached fiber product through the forcible circulation pipe to thereby decompose ozone; and
rinsing the fiber product after the decomposition of the ozone;
wherein an ozone concentration in the treatment vessel is measured over time in the fiber product bleaching step, and maintained within a predetermined range by increasing an ozone gas supply amount if the measured concentration is lower than a predetermined range, and reducing the ozone gas supply amount if the measured concentration is higher than the predetermined range.
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Abstract
An inventive method includes the steps of: loading a fiber product in an appropriate form into a treatment vessel; wetting the fiber product; forcibly circulating an ozone-containing liquid in contact with the wetted fiber product to thereby bleach the fiber product; and forcibly circulating an ozone decomposing chemical agent liquid in contact with the ozone-treated fiber product to decompose ozone. This method ensures efficient bleaching of the fiber product with the ozone. Further, the method is advantageous in that the resulting bleached fiber product is less liable to be yellowed over time.
10 Citations
24 Claims
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1. A bleached fiber product production method for bleaching a fiber product mainly including at least one of a natural fiber and a regenerated fiber to produce a bleached fiber product, the method comprising the steps of:
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loading the fiber product into a lidded hermetic vessel serving as a treatment vessel; forcibly circulating a treatment liquid in contact with the fiber product loaded in the treatment vessel through a forcible circulation pipe attached to the treatment vessel and provided with a circulation pump to thereby wet the fiber product; supplying an ozone gas into the treatment liquid in a minute bubble form via a gas-liquid mixing/ejecting means, the gas-liquid mixing/ejecting means being selected from an ejector, a vortex pump and a mixing pump, to provide an ozone-containing liquid, and forcibly circulating the ozone-containing liquid in contact with the wetted fiber product through the forcible circulation pipe to thereby bleach the fiber product; forcibly circulating an ozone decomposing chemical agent liquid in contact with the bleached fiber product through the forcible circulation pipe to thereby decompose ozone; and rinsing the fiber product after the decomposition of the ozone; wherein an ozone concentration in the treatment vessel is measured over time in the fiber product bleaching step, and maintained within a predetermined range by increasing an ozone gas supply amount if the measured concentration is lower than a predetermined range, and reducing the ozone gas supply amount if the measured concentration is higher than the predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17, 18, 19, 20)
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10. A bleached fiber product production method for bleaching a fiber product mainly including at least one of a natural fiber and a regenerated fiber to produce a bleached fiber product, the method comprising the steps of:
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loading the fiber product into a lidded hermetic vessel serving as a treatment vessel; forcibly circulating a treatment liquid in contact with the fiber product loaded in the treatment vessel through a forcible circulation pipe attached to the treatment vessel and provided with a circulation pump to thereby wet the fiber product; supplying an ozone gas into the treatment liquid in a minute bubble form via a gas-liquid mixing/ejecting means, the gas-liquid mixing/ejecting means being selected from an ejector, a vortex pump and a mixing pump, to provide an ozone-containing liquid, and forcibly circulating the ozone-containing liquid in contact with the wetted fiber product through the forcible circulation pipe to thereby bleach the fiber product; forcibly circulating hot water heated up to a temperature not lower than 50°
C. in contact with the bleached fiber product through the forcible circulation pipe to thereby yellow the bleached fiber product;forcibly circulating an ozone decomposing chemical agent liquid in contact with the yellowed fiber product through the forcible circulation pipe to thereby simultaneously achieve removal of a yellowing substance from the yellowed fiber product and decomposition of ozone; and rinsing the fiber product after the removal of the yellowing substance and the decomposition of the ozone; wherein an ozone concentration in the treatment vessel is measured over time in the fiber product bleaching step, and maintained within a predetermined range by increasing an ozone gas supply amount if the measured concentration is lower than a predetermined range, and reducing the ozone gas supply amount if the measured concentration is higher than the predetermined range. - View Dependent Claims (11, 12, 13, 14, 15, 16, 21, 22, 23, 24)
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Specification