Method and apparatus for the manufacture of a mixed yarn using m

Details Method and apparatus for the manufacture of a mixed yarn using m Method and apparatus for the manufacture of a mixed yarn using m

1996-01-26

1997-06-24

Falik, Andy

Textiles: manufacturing

Thread finishing

Surface modification of running length

28276, 28258, 57208, 57350, D02G 116

Patent

active

056407459

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method and an apparatus for producing and modifying a mixed yarn, consisting of at least one continuous filament yarn and staple fibers, in an airstream, wherein the airstream guides the continuous filament yarn.


BACKGROUND OF THE INVENTION

The conventional yarn manufactured from natural fibers such as cotton or wool by spinning imparts a respective typical textile character to the end product owing to the properties of the raw materials and to the spinning process. Since the introduction of so-called artificial silk, many methods of manufacture of the yarn on the one hand and for the treatment or the modification of the yarns on the other hand have arisen. In particular, two air technologies have become established in the market place for the modification of filament yarns. Both technologies are based on already spun continuous filament yarns, whether of artificial or natural silk.
Air interlacing technology which is shown schematically in FIG. 1 allows the manufacture of composite yarns. For example, a combination of filament yarn and fiber yarn or of two filament yarns is manufactured. In contrast to the air spinning of staple fibers, air interlacing technology necessitates a filament yarn in order to interlace the fiber yarn component. Air-interlaced composite yarns are additionally modified for particular applications. However, they are usually already finished products for subsequent processing such as weaving, knitting, etc. Special properties and effects which cannot be achieved by the spinning process can be manufactured by air interlacing technology.
The second air technology which has become established in industrial practice is so-called air jet texturing. This is shown schematically in FIG. 2. Air jet texturing allows a single continuous filament yarn to be treated or two (or more) continuous filament yarns to be combined to form a composite yarn and to be modified. Air jet texturing began in the fifties. It allows a so-called loop yarn to be manufactured from one or more smooth continuous filament yarns. The main item for air jet texturing is the air texturing jet which is shown on a larger scale in a simplified section in FIG. 3. The feed velocity (V.sub.1) of the filament yarn to the air texturing jet is higher than the output or take-off velocity (V.sub.2). The different velocity, described as overfeed, is required for forming the loops. The corresponding lengthwise displacements between the filaments is triggered by the energy of the flowing air. Loop formation results in an effective reduction in the yarn length. The jet therefore becomes a "yarn consumer" so to speak, i.e. more yarn is introduced than taken off owing to the higher intake velocity than output velocity. However, the quantity of yarn which is assumed to be absent can be found again in the form of loops and leads to an increase in the count after the jet. A model of loop formation is shown in FIG. 4. A braiding point "F" is usually defined.
To deflect the already textured yarn, a baffle device is very frequently arranged directly after the outlet from the texturing jet (FIG. 5). The compressed air can be introduced in parallel (FIG. 5) or, as shown in FIG. 3, radially into the yarn channel. It is possible to introduce two or even more continuous filament yarns simultaneously into the yarn channel and to combine them to form a textured yarn, for example so-called effect or bulk yarns. FIG. 5 shows the yarn channel in the lower portion as a compressed air inlet channel (PK) and subsequent jet channel (DBK). The compressed air is supplied to the jet head at 5-15 bar, preferably 6-10 bar. As a result of the high feed pressure, a supersonic airflow is manufactured if the jet, in particular the jet channel or jet accelerating channel (DBK) is of a suitable design. It is usually acknowledged by specialists that the success of air jet texturing is due to the utilisation of the phenomenon of the supersonic airflow, in particular the known shock waves and rapid sequence of compaction and expansion of the

REFERENCES:
patent: 3093878 (1963-06-01), Fieldman et al.
patent: 3474613 (1969-10-01), Joarder et al.
patent: 3822543 (1974-07-01), Edagawa et al.
patent: 4064686 (1977-12-01), Whitted et al.
patent: 5182900 (1993-02-01), Horak et al.

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