US1472958A - John bbandwood - Google Patents

Description

UAHUN Ur \LAuLLo or. nouns,

l QR led-1 2N358;

Patented Nov. 6, 1923.

STATES JOHN BRANDWOOD, THOMAS BRANDWOOD, AND JOSEPH BRANDWOOD, or ELTON, BURY, ENGLAND.

PROCESS FOR THE BLEACHING OF YARN WOUND IN COMPACT FORM.

No Drawing.

To all whom it may concern:

Be it known that we, J OHN BRANnwooD, THOMAS BRANnwooD, and JOSEPH BRAND- woon, subjects of the. King of Great Brit ain and Ireland, and residents of Elton, Bury, in the county of Lancaster, England, have invented certain Improvements in a New and Simplified Process for the Bleaching of Yarns Wound in Compact.- Form, of which the following is a specification.

In the common practice followed in the I bleaching of cotton yams in the wound is washed o form such as on copmfeses, or perforated beams, a preliminary boiling of the yarns with alkali, such as .causticusoda; or soda ash, is a necessity, in order that the cotton wax in the yarn, and which wax makes the yarn water repellent, may be removed so that the said yarn may take evenly the subsequent treatment with hypochlorite bleaching liquor. Such boiling or wetting out involves considerable delay, as the duration thereof is from six to twelve hours, and further a very thorough washing off of the yarns is necessary after this alkali treatment. These operations not only consume time and prolong the bleaching proc ess but the cost of alkalies, cost of plant, and labour involved, are: serious considerations. There is also a risk, unless the washing oil of the alkalies has been thoroughly effected, of tendering of the yarn where it comes in contact with metal in the subsequent hypochlorite treatment, e. g., where the yarn is wound on metal perforated tubes, which is necessary when bleaching on the beam or the cheese.

washing off of the yarn after such alkali. In carrying it into effect we put the yarn, in wound form and in the 5 treatment.

dry state as it comes from the winding operation, in a convenient receptacle, and treat it with hypochlorite bleaching liquor by passing the latter under pressure through the yarn packages by means of a pump. After the hypochloijj te treatment theoyarn ""Tlie usual souring treatment after the bleaching liquor treatment is not essential but may be effected if thought desirable.

The term in a dry state as above used Application filed March 25, 1922. Serial No. 546,813.

and in the claims refers toyarn packages such as yarn wound on beams, cheeses, and other forms of yarn in compact form which have received no preliminary wetting out and alkaline treatments.

Conveniently, we may, for the purpose of carrying out the process for the bleaching of yarns wound on a. perforated beam, employ the apparatus described and claimed in the specification of the British Letters Patent No. 551 of 1913 granted to two of the present applicants and another, and which apparatus comprises a kier, liquid tight seatings for yarn-wound perforated beams within the said kier, means for holding the beams in position, and pumps adapted to force liquor from the kier through the yarns to the interior of the perforated beam, or in the reverse direction. For the bleaching of yarns in cheese form we may employ the arrangement described in our specification to our British Patent No. 190,- 760 wherein yarn cheese are mounted on vertical rods and secured thereon, with means for seating and holding the cheese bearing rods in a kieir such as is described in the specification to British Letters Patent 551 of 1913 before referred to.

By forcing the bleaching liquor through the yarn packages at considerable pressure, we find that the combined chemical and mechanical action of the said liquor under pressure, effects, in a perfect manner, the bleaching of the yarns. The pressure sufficient to force the volume of li uor through the yarn mass is sufficient to e ect our pur pose of bleaching by the process described, but such pressure may be increased if found desirable. The liquor may be circulated through the yarns in one or both directions in the manner known in dyeing yarns in the wound form on beams, cheeses and the like, the duration of the process depending upon the quality of the cotton under treatment.

Although positive pressure of the liquor is preferable, being more satisfactory as to results and more rapid in effect, the method known in dyeing, of exhausting liquor through wound yarns-cops and cheesesmay be employed, and such suction of liquor through the yarns will be deemed to be included under the term pressure used in this description.

Although ordinary bleaching liquor may be used for the carrying out of our presout process, we prefer to use it as prepared according to the process disclosed in our specification accompanying application for British Letters Patent No. 3039/22 in which the necessary chlorine constituent is fed direct to a circulating pump through which alkalinated liquor is passing. This ensures that the bleaching liquor will enter the bleaching receptacle in a nascent condition, which gives the best results. Very strong solutions of the liquor can then be used without any danger of weakening or tendering the yarn.

A further point with' regard to our pres-- out process is that we have found by experiment that dry yarn treated directly with the bleaching liquor under pressure as described, quickly and thoroughly absorbs the whole of the available chlorine in the said liquor.

After the treatment with bleaching liquor is completed the yarn is washed off by the circulation of wash water therethrough and any desired tinting may be effected. The usual souring or acid treatment for the clearing of the bleaching liquor process, is not essential as a step in our process but may be effected if desired.

e claim 1. Process for the bleaching of cotton yarns on the beam, cheese or other compact wound form, said process consisting in immersing the yarn packages in the dry state, in a 'hypo-chlorite bleaching liquor, and forcing the said liquor through the yarn packages under pressure, with subsequent washing of]? and drying.

2. Process for the bleaching of cotton yarns on the beam, cheese or other compact wound form, said process consisting in immersing the yarn packages in the dry state, in a hypochlorite bleaching liquor, and forcing the said lquor through the yarn pack ages under pressure, with subsequent souring, washing off, and drying.

In testimony whereof we have hereunto set our hands.

JOHN BRANDVVOOD. THOMAS BRANDVOOD. JOSEPH BRANDVVOOD.