Texparts PK 2630 SEH - The innovation of the drafting system

FELLBACH, (PresseBox) - At the end of the eighties, the ring spinning process underwent a remarkable renaissance. The limitations of the already familiar Air Jet Spinning process had become obvious as far as the technical and technological application potential and efficiency were concerned. Spinning machine manufacturers concentrated increasingly again on improving the ring spinning machine. The innovation process re-gained momentum with a speed, hard to imagine. The international exhibitions of the following years showed many new features and innovations that still today influence the market (i.e. compact spinning).

The importance of flexibility in the spinning mill

Yarns, as intermediate products in the textile production chain, are subject to ever more frequent fashion changes, particularly in the clothing and house-hold textiles sectors. The spinner's market has therefore become more diverse and short-term, and has clearly developed into a buyer's market. Today more than ever the customer determines yarn characteristics, yarn quality and, above all, the delivery he needs for his end-product.

Flexibility through modern drafting systems

What possibilities do modern drafting systems offer for positively affecting flexibility in ring spinning?

- Increased flexibility means the widest possible raw material spectrum, i.e. widest variety of fiber characteristics, such as length, count and origin, in order to be able to produce without costly machinery adaptation for an example
- Problem-free use of the largest possible fiber mass in drafting
- Rapid adaptation of all essential drafting parameters to all the technological requirements of the fiber material to be processed in order to obtain maximum product quality
- Reduction of setting-up time and the associated setting-up costs
- Shortening of material flow time throughout the entire spinning mill in order to reduce large capital tieup caused by excessive circulating capacity and to unnecessarily long delivery times.

In addition to all of this, comes the requirement for the simplest possible operation of all drafting system components.

The required profile for modern drafting systems deriving from this is shown in Fig. 1. The two most important features, which allow reacting most effectively to spinning requirements are, the problem-free use of high total drafts and the possible use of adequately load pressures. Above and beyond that, the fitting of the weighting arm to the ring spinning machine, the setting and the possibility of interchangeability of all drafting components must be quick and easy to ensure minimum downtime. Ergonomically designed operating elements are also important prerequisites for meeting spinning requirements.

Requirements in flexibility of drafting systems

With the new drafting systems for short-staple ring frames, the PK 2600 Series, Oerlikon Textile Components has taken all the above mentioned factors into consideration during development, and have brought more flexibility into the function and fitting of the weighting arms. With the PK 2630 SE for ring frames with round support rods and PK SEH for ring frames with hexagonal support rods Oerlikon Textile Components has truly created the world's most versatile weighting arm series.

The latest addition to the series, the PK 2630 SEH is for ring frames with hexagonal support rod (Fig. 2)

PK 2600 SE series - no other weighting arm offers so many advantages:

The weighting arm system offers - both in assembly and during continuous spinning operation - a wealth of advantages unmatched by any other system on the market:

- Rapid assembly and setting
- Simple and easy operation
- Expanded range of applications for fiber length and fiber type
- Quick and very accurate height setting
- Independent working single elements
- Minimized load variation from spinning position to spinning position
- High flexibility in weighting arm settings

The PK SEH is the dawn of a new era in weighting arms for ring frames with hexagonal support rod, where the alternatives have been more limited than for ring frames with round support rod.

Fast and flexible assembly

Assembly is fast and easy thanks to the mounting from above. Each PK SEH arm can be separately mounted and replaced at every spinning position on the hexagonal support rod, as used with Rieter and LMW ring frames (Fig. 3). The previously necessary "threading" of the arms onto the support rod is not necessary anymore. Support rod is mounted on the machine empty, which makes the process much simpler and faster. The PK 2630 SEH can be fixed on the support rod easily from the front and without any complications.

The new design now allows to utilize the proven benefits of the established PK 2630 SE on Rieter and LMW ring spinning machines as well. This makes conversions possible in a quick and easy way. A special challenge was to keep the spinning geometry of Rieter and LMW ring frames. Now it is possible to use the full flexibility of setting possibilities for load and drafting zones with these machines, too.

The height setting of the weighting arm can now be done very fast and accurate from the top of the weighting arm. Due to the exact and user-friendly setting the time consuming height adjustment now is a thing of the past.

EasySet helps to ensure consistent yarn quality from spinning position to spinning position. (Fig 4)

Amazingly simple operation

The arm can be operated without exerting much force. Easy handling and operation is guaranteed by a new lever construction. Less strain while handling causes less stress on functional elements and ensures a longer service life as very little force is needed to open and close the weighting arm.

More flexibility

The use of high total drafts, the reliable control of large fiber masses in the drafting system as well as high-twist rovings and a reliable and slip-free apron drive require higher but also technologically reasonably adjustable load on the rear and apron top roller than in the past.

For a flexible adaptation of load to the technological requirements of the fiber material, the load can be set with 5 possible load steps with a maximum load of 200N per element. The fiber clamping and guidance is thus ensured in an optimal way.

Variable load adaptation for the different requirements of the fiber materials to be processed allows high technological flexibility, gentle treatment of cots and aprons, reduced wear of bottom roller bearings and reduced gear load.

With the possibility of higher load settings one is prepared for future technological demands. Texparts EasyIndicate (Fig. 5) enables an easy reading of the load and prevents false settings.

Wrong settings of the load can be easily visually detected and immediately corrected to avoid variations in yarn quality from spinning position to spinning position.

New top apron cradle concept

The million-fold proven concept with individual apron tensioning system was further improved and modified. The new Texparts OH2122 cradle (Fig. 6) ensures low friction and therefore gentle apron running. This is achieved by a special surface structure. A low drive torque ensures an extended service life of the aprons.

The ideal parallel positioning of the top apron cradle on the bottom roller is guaranteed. Usage of the standard series of Texparts distance clips ensures optimal fiber guidance. The individual tensioning of aprons per spinning position results in a constant and reproducible high yarn quality from spindle to spindle.

Up to 40 % of time can be saved as the apron can be exchanged without removing the entire apron unit.

Numerous trials were conducted in various spinning mills to prove the performance of the PK2630 SEH weighting arm under normal mill conditions. Fig. 7 shows the possible improvements as an average against the existing weighting arms on the ring frame. The chart shows that even the more sensitive IPI values can be improved in a great way.

Another important value is the quality variation from spindle to spindle (CVb). Here we can see a big influence of the weighting arm, which can cut the value up to half. This means constant yarn quality from all spinning positions and from all ring frames at customer site.

The running field tests show that the new weighting arm is highly accepted by the operators as well as the mill management. Both appreciate the advantages of the PK2630 SEH and are very much interested in using this system in the future. The agile interest in the project has shown that this weighting arm is highly noticed as an innovation. The simple handling, clearly increased consistency in yarn quality and the flexibility in settings are considered as the most important improvements as a counterpart to the existing products.

Conclusion

During the development phase lots of positive results were achieved which have given clear advantages to our customers, i.e. higher productivity, simple handling, more consistent yarn quality as well as an increase in flexibility. The development process was highly influenced by market demand and supported by customer orientation. The members of the project consisting of textile technology, marketing and sales were aiming to consider all the customer requirements. With the new PK 2630 SEH an essential development objective, namely to bring an innovative drafting system into the market, has been reached. This has already been confirmed by the positive feedback from our customers as well as from the results of the various field tests.

About Oerlikon

Oerlikon (SIX: OERL) is a leading high-tech industrial group specializing in machine and plant engineering. The Company is a provider of innovative industrial solutions and cutting-edge tech-nologies for textile manufacturing, drive, vacuum, thin film, coating, and advanced nanotechnology. A Swiss company with a tradition going back over 100 years, Oerlikon is a global player with more than 17 000 employees at over 150 locations in 38 countries and sales of CHF 4.2 billion in 2011. The Company invested in 2011 CHF 213 million in R&D, with over 1 200 specialists working on future products and services. In most areas, the operative businesses rank either first or second in their respective global markets.

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