Sando Iron Works Co., Ltd.

Yoshiteru Sando

Hiroshi Ishidoshiro

Eiichi Nakano

Koji Sando

The object of the present invention is to make the addition of a dye solution to a long cloth passing through the interior of a high temperature and high pressure steamer continuously, smoothly and surely. Suitable amount of moisture is added to a cloth prior to the supply thereof to a high temperature and high pressure steamer, and a dye solution is added to the thus soaked cloth with the use of nozzles in the interior of the high pressure steamer body. The addition of the dye solution can be made on the entire surface of the cloth speedily and effectively in the interior of the high temperature and high pressure steamer.

Method for high temperature and high pressure continuous dyeing of a

A method and an apparatus for the continuous pretreatment of a long cloth produced commercially in completely gaseous system, in which, by utilizing the combination of a desizing and scouring process in a low temperature plasma atmosphere and a bleaching process in an atmosphere of ozone and ultraviolet ray radiation, and thus entirely no application of liquid system.

Method and apparatus for the pretreatment of a cloth

A method for bleaching a cloth comprising subjecting a cloth soaked with an aqueous bleaching solution comprising sodium chlorite to wet heat treatment at a temperature nearly to 100.degree. C., particularly subjecting a long cloth soaked with the bleaching solution to wet heat treatment continuously in an ordinary pressure wet heat treating chamber of which atmosphere being acidified to a pH of 3-4 by the use of an activation agent for making the atmosphere containing sodium chlorite acidic comprising an inorganic acid such as sulfuric acid and hydrochloric acid, an organic acid such as formic acid and acetic acid, and a carbonyl compound such as formaldehyde and acetaldehyde so as to form chlorine dioxide active for the bleaching of a cloth by the decomposition of sodium chlorite, and apparatuses for carrying out the method.

Method for bleaching cloth

A method for the pretreatment of a long cloth continuously in which a cloth to be subjected to desizing, scouring and bleaching for the pretreatment thereof is preliminarily subjected to souring treatment in the sodium chlorite solution prepared by absorbing the chlorine dioxide gas, which is exhausted from the subsequent bleaching process with the use of chlorite, in a solution of H.sub.2 O.sub.2 and NaOH, and accordingly it is possible to transport the long cloth continuously in the pretreating process speedily with no need of staying the cloth in folded state for increasing the productivity and improving the quality of the product, and further to render the pretreating apparatus compact so as suitable for the production of small lot products.

Method for continuous pretreatment of a cloth

A method for desizing and scouring of a long length of cloth comprising desizing a cloth washed with hot water, and then subjecting the cloth thus washed successively to soaking with a hot alkaline sodium chlorite solution, immersing in a hot acid solution with a pH of 2-4, then to soaking with a caustic soda solution, and finally to the wet heat treatment under the ordinary pressure.

Method for desizing and scouring of a cloth

A method for the decolorization of waste water containing coloring matters comprising dyestuff and/or pigment, in which PVA is added to a waste water containing coloring matters as above mentioned so as to catch the coloring matters in the waste water into the PVA, a precipitant of the coloring matters is added to the resultant waste water so as to render the coloring matters absorbed onto the PVA insoluble, a coagulant of PVA is added to the waste water so as to make the PVA insoluble, and then the thus insolubilized PVA containing the coloring matters is separated for the recovery thereof, and thus the decolorization of a waste water containing the coloring matters can be done skillfully and economically by eliminating the drawbacks in the conventional arts.

Method for decolorization of waste water

A method for separation of PVA from an aqueous solution thereof such as the waste water containing PVA from the pretreatment of a textile product, in which a peroxosulfate such as ammonium peroxosulfate is added to an aqueous PVA solution, particularly in an acidic condition with addition of sulfuric acid, at a temperature above 70.degree. C. for the separation of PVA, and as a result the thus separated PVA contains only a small amount of water in the range of about 60-70% and can easily be treated.

Method for separation of polyvinyl alcohol from aqueous solutions

A method for preventing the adhesion of scale on the sealing mechanism of a high pressure steamer in a process of continuous scouring of a long cloth therein, which comprises washing the cloth to be subjected to scouring with the use of weak acidic water with a pH of 5-6 outside of the steamer body, passing the thus washed cloth through the sealing mechanism of the steamer body, and then applying a scouring agent solution to the cloth in the interior of the steamer body. A durable sealing mechanism can be offered by preventing the damage of the sealing mechanism.

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Wakayama, Japan

Yoshiteru Sando