High Speed Spindles Technology HP-S 68 (Novibra)

IntroductionA textile spindle is a device with oscillatory properties which, depending on the speed of rotation due to its unbalanced state, is vibrationally excited.
The spindle can be described as a spring-mass system with a damping device proportional to rotation speed. The running performance of a spindle is directly influenced by the individual bending stiffness and the damping characteristics of the system.
For spin-technological reasons a quiet run of the spindle, concentric to the spinning ring and with minimum amplitudes at the top of the spindle, is required.
All spinning spindles are operated in the hypercritical speed range. The first critical speed is, according to spindle design, between 2,000 and 4,000 rpm. This speed is only relevant during the start of the machine. The occurrence of a second critical speed within the working speed range of the spindle must be avoided at all cost. Apart from other factors, this is achieved by making the spindle upper part sufficiently resistant to bending deflections.
HP-S 68 Spindle Design
Modern spindles must be designed for spindle speeds above 20,000 rpm. The special aim is to ensure that belt or tape speeds do not increase in the same ratio as the spindle speed. The objective is therefore to reduce the wharve diameter still further. This can only be achieved by reducing the dimensions of the neck bearing and, consequently, the shaft diameter of the spindle upper part. Smaller spindle shaft diameters with otherwise the same bearing dimensions are however less rigid.
As mentioned above, a reduced stiffness of the spindle upper part would have a negative influence on the running performance of the spindle. Consequently, when reducing the diameter of the spindle shaft of HP-S 68 spindle to 6.8 mm, the distance

Travellers types (Bracker)

SHORT STAPLE SPINNING AND TWISTING

C-shaped travellers for T-Flange rings - SFB and SU travellers for oblique flange rings

SAPHIR

Characteristics:

• Diffusion treatment with deepened effect
• Special components penetrate the traveller and are active also when traveller wear occurs

Application:

• High-speed travellers
• Ring running in and normal use
• All fibre types

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STARLET
Characteristics:

• Special nickel plating
• High resistance to corrosion
• Good gliding properties

Application:

• Chemical fibres and blends
• Difficult environmental conditions

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Drafting arrangement

In most spinning mills today, the first intermediate product is a card sliver. It contains about 20 000-40 000 fibers in cross-section.

This number must be reduced in several operating stages to about 100 in the yarn cross section. The reduction can be effected in two ways:

• ·         through the draft, i.e. the distribution of an approximately constant total number of fibers over a greater length of the product ; or
• ·         through elimination of fibers (loss) into waste (p).

Elimination is not an intentional reduction of the number of fibers but arises as an unavoidable side effect of the necessity for cleaning; it occurs in the blowroom, in carding, and in combing. (Fiber loss is intentional in combing, as the aim is to remove short fibers.)

However, since drafting takes place simultaneously here, the term “attenuation” is used. This is defined by:

p is the waste percentage.

Spinning Triangle

The formation of the spinning triangle

 Fig. 83 – Short (a) and long (b) spinning triangle, (c) side view

The turns of twist in a yarn are generated at the traveler and move contrary to the direction of yarn movement toward the drafting system. Twist should run back as far as possible toward the nip line of the rollers, but it never reaches as far as the nip because, after leaving the rollers, the fibers first have to be diverted inwards and wrapped around each other. The twist moves up until angle κ (which is the angle of the fiber arrangement in the yarn) is equal to angle η of the spinning triangle (Fig. 84). There is therefore always a triangular bundle of fibers without twist, the socalled spinning triangle, at the exit from the rollers. By far the most end breaks originate at this weak point, because the yarn tension in the balloon can be transmitted almost without obstruction as far as the drafting system, whereas twist in the spinning triangle is zero.

Persyaratan untuk hasil optimum antara ring dan traveller

Geometri spinning dari mesin spinning harus disesuaikan dengan benang yang diproduksi.  Dengan memodifikasi beberapa parameter dibawah ini, maka hasil yang diharapkan mungkin bisa tercapai.

Yang terpenting adalah centering daripada spinning ring, anti balooning, dan snail wire terhadap spindle.

Hal ini akan menjamin (diiringi dengan jalur benang di mesin yang baik dan ketepatan pemilihan travellers) benang yang bagus.

Setting snail wire

-          Jarak dari ujung paling atas cop dengan snail wire = 1,5 sampai 2 x Ø medium cop

Anti balooning

-          Cara menentukan diameter anti balooning = Ø flange ring + 2mm

-          Jarak antara ring rail dengan anti balooning (ring rail berada di posisi start = 2/3 dari jarak ring rail ke snail wire.

Spinning Ring / flange ring

-          Menentukan spinning ring (flange ring)  Ø = maksimum 1/5 dari panjang  cop (kecuali untuk benang filamen), lihat tabel dibawah :

-          Posisi flange ring yang benar – benar horisontal dan penempatan yang tidak goyah.

-          Setting yang benar dari traveller cleaner.