Textiles: knitting – Fabrics or articles – Materials
Reexamination Certificate
2000-06-14
2001-09-18
Worrell, Danny (Department: 3741)
Textiles: knitting
Fabrics or articles
Materials
C066S171000
Reexamination Certificate
active
06289701
ABSTRACT:
FIELD OF THE INVENTION
My present invention relates to the production of elastic garments adapted to fit closely on a human body part, especially hosiery such as hose, stockings, and socks and the like. The invention also relates to a method of making such garments and, especially, stockings, socks and other hosiery articles which are to be sufficiently elastic as to hug the portion of the leg onto which the garment is fitted.
BACKGROUND OF THE INVENTION
As a practical matter in the past it has been the practice to produce knitted elastic garments such as hosiery from two or more yarns. In other words it was not as a rule possible to knit hosiery from a single yarn. In the knitting of hosiery, therefore, it was common to utilize a yarn which was spun from cotton and/or wool together with a second yarn which had the function of contributing to the hosiery the highest possible degree of elasticity. This is important in the case of stockings since the feet and legs of potential wearers can be greatly different in shape and dimensions. A knitting machine is, however, limited in the dimensions with which the tubular articles are to be knitted. The elastic yarn incorporated in the hosiery, therefore, must assume the function of allowing the garment to accommodate itself to the foot not only at the heel but also at the toe and to the leg all without the formation of folds.
To achieve this, knitted hosiery technology has developed a variety of techniques. Initially textured polyamide was used as a so-called plated yarn to contribute elasticity to the knitted goods. Subsequently elastomers (for example Lycra) entered the market in a significant way and the elastic yarns were so-called wrapped yarns and colored core yarns. The elastomer thread, for example (Lycra) could be wrapped with polyamide or could have cotton thread spun around the elastic core.
In spite of these developments, to date the hosiery structure has not changed materially. Now as then, two yarns are knitted together when the hosiery article is to be elastic. The plating technique has required the knitting yarn and the plating yarn always to maintain desired positions relative to one another. Usually the plating yarn (textured polyamide, wrapped yarn or core yarn) was provided on the inner side of the stocking while the outer side of the stocking was formed by cotton yarn, wool yarn or a blend thereof. The plating technique, however, has created two significant problems for the hosiery knitter.
(a) The two yarns must always be colored exactly the same. In practice this is not possible since no yarn supplier has all of the yarns which may be used for stocking manufacture in its program. Different substrates dye differently. Color deviations between the plating yarn and the knitting yarn are therefore frequently unavoidable.
(b) The plating technique has a defect frequency of 2 to 5% depending upon the nature of the knitting operation and the productivity of the enterprise. This means that 2 to 5% of the stockings have the yarn for the front and back sides interchanged. Since the colors do not match precisely, this means that the stockings will have stripes where the yarns have been reversed in position so that the stockings can only be marketed as second quality goods or cannot be sold at all.
These problems have plagued the industry even prior to the beginning of 1960 when French patent 1,205,976 was published describing the production of socks and men's hosiery by combining a nonelastic and elastic fiber intimately in a spun yarn. The latter yarn, however, had a very high elongatability and was not fully satisfactory as excessive elongatability is also a disadvantage since it is important to provide in such hosiery a certain restoring force upon elastic deformation to ensure a perfect conformity of the hosiery to the foot and leg. The yarn must have excellent appearance when knitted into the article and a pleasing soft hand in the fabric. These features were not characteristic of the earlier yarns.
OBJECTS OF THE INVENTION
It is the principal object of the present invention to provide a method of making hosiery which avoids the plating technique and significantly simplifies the process, especially for stockings, socks and hose.
Another object of the invention is to eliminate disadvantages of earlier elastic garments and their fabrication.
SUMMARY OF THE INVENTION
These objects and others which will become apparent hereinafter are attained, in accordance with the invention by the use of false twist or spinning twist knitting yarn made by combining a first yarn selected from the group which consists of cotton yarn, wool yarn, a synthetic yarn and blends thereof with a second yarn different from the first yarn and including an elastomer, and spinning the combined first and second yarns in a SpiroSpun process, for producing an elastic garment in the form of hose, a stocking or a sock.
More particularly, the method of the invention can comprise the steps of:
(a) forming a knitting yarn by combining a first yarn selected from the group which consists of cotton yarn, wool yarn, a synthetic yarn and blends thereof with a second yarn different from the first yarn and including an elastomer, and spinning the combined first and second yarns in a SpiroSpun process with a false twist or spinning twist; and
(b) knitting said knitting yarn into an elastic garment shaped to conform to a human body part to be received therein.
The elastic garment, namely, socks, stockings, panty hose and like hosiery, is shaped to fit the human body part and is knitted from a knitting yarn formed by combining a first yarn selected from the group which consists of cotton yarn, wool yarn, a synthetic yarn and blends thereof with a second yarn different from the first yarn and including an elastomer, and spinning the combined first and second yarns in a SiroSpun process with a false twist or spinning twist.
The invention, therefore, allows the production of stockings, hose, socks and like garments from a knitting yarn which has been used as a yarn in weaving technology and which is made by the SiroSpun process, (a spin-twisting process involving the doubling of yarn) from wool and/or cotton with an elastomer filament (of the type which is known from the production of wrapped yarn or core yarn) and can be the filament core thereof, (for example Lycra) to form a false or mock twist or a spinning twist. The knitting yarn which is made in this manner can have a denier or gauge common for such hosiery. The SiroSpun process is described, inter alia in Lexikon fur Textilveredlung, Vol. 3, Page 1989-1990, Laumann-Verlag, Dülmen, 1995.
Hitherto so-called SiroSpun were exclusively used in weaving operations. There they served as an inexpensive variant to twisted weaving yarns. In the weaving industry, there is direct differentiation between the yarns used for the warp and weft and there the reject problem associated with the plating technique does not arise.
A significant advantage of the invention is that it allows the production of elastic stockings and comparable garments by knitting without the need for two yarns. Only a single yarn is required. As a consequence, the problems of the plating technique are eliminated here as well as along all of the drawbacks associated therewith. It has been found, surprisingly, that the garments made in accordance with the present invention in their final manifestations have an aesthetically pleasing uniform mesh structure. In addition, the goods have an extremely soft hand.
According to the invention, the elastomer can be an elastomer filament or an elastomer filament core and the core can be the core of a core yarn and wrapped with an elastomer filament spun around that core.
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patent: 4525992 (1985-07-01), Payen
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patent: 446 215 (1964-04-01), None
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patent: 1 205 967 (1958-
′WGF′ Colcoton-Garn Hasenack & Co.
Dubno Herbert
Worrell Danny
LandOfFree
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