US2798282A

US2798282A - Identifying and segregating yarn in different parts of yarn packages

Info

Publication number: US2798282A
Application number: US432300A
Authority: US
Inventors: Carr Montford Boylan
Original assignee: American Enka Corp
Current assignee: Akzona Inc
Priority date: 1954-05-25
Filing date: 1954-05-25
Publication date: 1957-07-09
Anticipated expiration: 1974-07-09

Description

Unite Montford Boylan Carr, New York, N. Y.,

American Enka Corporation, Enka, tion of Delaware No Drawing. Application May 25, 1954, Serial No. 432,300

8 Claims. (Cl. 28--75) assignor to N. (3., a corpora- The present invention relates to the manufacture of rayon, and more particularly it relates to a special treatment of rayon cakes after they have been normally processed and dried or cones made therefrom.

In the production of rayon according to modern practices, the yarn is spun and collected in package form such as cakes collected in rapidly rotating pots or buckets. These cakes are then subjected to the necessary aftertreatments involving washing, desulphurizing, bleaching and drying.

Due to several factors peculiar to the process, differences in physio-chemical properties result in the product. One of the most serious consequences is the dyeing differences or dye receptivity that occur in fabrics made from the cakes. Apparently, there is a variation in yarn properties throughout the cake which results in a dye rate difference that is most noticeable at the insides and outsides of the cakes, and this is particularly objectionable in subsequent textile processing, for example, when the yarn is woven into cloth. Streakiness and different shades are evident in the cloth, which naturally lowers its quality and therefore sales appeal.

Whereas, it is not certain what all of the underlying contributing causes are, it is believed that unequal tensions and strains are set up in the cakes when they are spun, then when the yarn is dried according the some of the methods, the interior portions can shrink to a greater extent than the :outer portions. Various methods have been proposed for overcoming these differences, one of which is to treat the insides of the cakes for a short period with warm moist air or low temperature steam. Another method is to progressively increase the stretch throughout the spinning period of the cake so as to compensate for the eifect of greater shrinkage inwardly.

While such measures have proved helpful, they are not entirely satisfactory as some differences in dyeing characteristics are still evident between the Various portions of the cakes, and streakiness in the fabrics are more or less pronounced. This is particularly noticeable when the yarn cakes are used for filling in a woven fabric. When thus used, yarn originating from the inside, or near the inside, of one cake may be woven adjacent yarn from the outside portion of another cake, and the dilference in dye rate will be"'more pronounced.

It has been recognized, however, that in cakes of the same size about the same portion of each cake dyes substantially the same shade, i. e. the inner portions of the cakes dye about the same, the central portions of the cakes dye about the same, and the outer portions of the cakes dye about the same.

Therefore, it is most desirable in re-winding the yarn from the cakes onto cones, filling bobbins, etc., to Wind those portions having the same dye receptivity onto common collecting devices so that they can be segregated and used in the same cloth. Additionally, when a large number of cakes are disposed on a creel and the yarns wound in parallel onto a section beam, it is desirable that States Patent ice the cakes be unwound uniformly and concurrently in order to have the same portions of the cakes in the same position on the beam; and to visually indicate that they are in the same position.

It is therefore an object of this invention to treat cakes or the packages formed from the cakes with a fugitive dye or tint in such a manner that the various portions of the cake can be readily identified and segregated.

It is a further object of the invention to use diiferently colored fugitive dyes for the different portions so that they can be visually designated.

According to the invention, after the cakes have been processed and preferably dried, they are given a special treatment with a fugitive dye, whereby the outsides of the cakes are tinted one color and the insides are tinted another color. The central portions of the cakes are untreated, and therefore remain in their natural shade, which is white if the cakes have been bleached. This tinting operation can be accomplished in several ways, e. g., a fugitive dye can be caused to penetrate a certain radial distance on the outsides of the cakes, and a fugitive dye of a different color can be caused to penetrate a certain radial distance on the insides of the cakes.

It is known that different dyes penetrate different distances, and it is important to make the proper selection of a dye that will penetrate the required depth. Any of the well known Water soluble dyes or oil soluble dyes may be used, although oil soluble dyes are usually preferred because of their more efficient penetration. Another way of marking the cakes or cones wound therefrom is to empirically determine the amount of yarn to be designated with one color, and the amount of yarn to be designated another color, and then determine the radial distance these amounts take up and so mark these portions that radial distance at the tops and/or bottoms of the cakes or cones.

When the cakes thus marked are wound onto pirns, the pirns formed from the outsides of the cakes will be identified by one color, and the pirns formed from the insides identified by another color, and the pirns formed from the central portions of the cakes will remain in their natural color. This enables a textile processor to segregate the pirns according to their yarn location on the cake and use the pirns having the same color on the same group of looms. It is obvious that in this manner the fabrics made therefrom will show an improved uniformity in dye rate; and although cloth woven from looms using yarns from pirns of one color will dye a different shade from cloth woven from looms using pirns of another color, the cloth itself in each loom will dye substantially uniformly. It is, of course, to be understood that the fugitive dyes are washed out before or during the time that the permanent dyeing is elfected.

When cakes are marked in the above fashion and a number are simultaneously re-wound from a creel onto a section beam, the outer portions carrying one color will be at the interior of the beam and the central portion in a natural shade will be in the central portion of the beam, and the insides of the cakes carrying another color will be on the outside of the section beam. The processor, when using these beams as a warp in the fabric can readily see when one color runs out and another starts so that he can either change his formula for the ultimate dye bath, or he can use the succeeding portion on another loom.

It is obvious that various modifications can be made in the process without departing from the spirit and scope of the invention, and it is to be understood that the invention is only limited to the extent of the scope of the appended claims.

What is claimed is:

1. An article of manufacture comprising a cake of rayon tinted at the outer portion with a fugitive dye of one color and tinted at the inner portion with a fugitive dye of another color.

2. A process for identifying and segregating yarn from different parts of a yarn package, which comprises tinting portions of the package with fugitive dyes and winding those portions having the same color onto a collecting device.

3. A process for identifying and segregating yarn from different parts of a yarn package which comprises tinting difierent portions of the package with diiferent colored fugitive dyes and winding those portions having the same color onto a collecting device.

4. A process for identifying and segregating yarn from different parts of a yarn package which comprises tinting different portions of the package with different colored oil soluble fugitive dyes and winding those portions having the same color onto a collecting device.

5. A process for identifying and segregating yarn from different parts of rayon cakes which comprises applying a fugitive dye of one color to the outer portions of the cakes and a fugitive dye of another color to the inner portions of the cakes, winding the outer portions having the same color onto a collecting device and winding the inner portions having the same color onto another collecting device.

6. A process for identifying and segregating yarn from different parts of rayon cakes which comprises applying a fugitive dye of one color to the outer portions of the cakes and a fugitive dye of another color to the inner portions of the cakes, creeling a number of such cakes onto a section beam whereby the same colored portions will be in the same position on the beam.

7. A process for identifying and segregating yarn from different parts of rayon cakes which comprises applying a fugitive dye of one color to the outer portions of the cakes and a fugitive dye of another color to the inner 5 portions of the cakes, winding the outer portions having the same color onto one group of pirns, winding the inner portionsonto another group of pirns and winding the central portions onto a third group of pirns, segregating the respective groups and processing each group on separate looms.

' 8. A process for identifying and segregating yarn from different parts of a yarn package, which comprises winding a cake of rayon onto a cone and marking predetermined radial sections at one end of the cone with fugitive dyes of different colors.

References Cited in the file of this patent UNITED STATES PATENTS Jour. Soc. Dyers & Col. for December 1947, pp. 430- 438.

Amer. Dyestuff Reporter for Aug. 9, 1948, p. P-525.

Rayon and Syn. Tex. for September 1949, pp. 95 and 96.