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| Product Name ：Double Twist Machines |
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| DATE：2005-11-22 Pan Asian Oasis Inc. |
| Porduct |
Double Twist Machines |
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| Date |
2005-11-22 |
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About |
The production of power cable incorporating double twist machines is a rapidly expanding area. This is due in no small part to the economic advantages and product flexibility of using this type of machine, especially when coupled with Ceeco Bartell’s patented roll form technology.
Double twist machines produce similar products to those manufactured on bobbin stranders. The five main advantages that double twist machines have over alternative methods of manufacture are:
1. Low capital investment when compared to tubular and rigid stranders.
2. Very high production speeds
3. Reduced space requirement
4. The use of large capacity static input devices with continuous pay-off capability. This gives minimum machine downtime.
5. Reduction in number of wire sizes required using the Ceeco Bartell patented roll-forming process.
6. Low manning levels giving labour cost savings.
The different types of stranding have been listed in Table 1, taking into account cost/twist, lay limitations, layer limitations, typical payoff package and payoff mode.
Table 1 – Equipment Factors
The capital cost per twist for Double Twist Strander can be based as 1, compared to other stranding processes, it can be seen that it is the most economic solution for multiple layer strand construction. Two important points to remember are:
1. The speed of the Double Twist machine is 1200 tpm, produuct dependent, whilst in comparison the rigid strander at best would operate at 350 tpm.
2. While the loading time of 19 DIN 630 reels can be minimised, the rigid strander must still be stopped in order to replenish the reels and allow welding of the wires. Even with modern automatic loading, it is estimated that two operators would take 30 to 45 minutes to complete a loading sequence.
In comparison with the use of the automatic change over facility at the pay off system the operator is able to change the 19 coils of wire and weld them together while the Double Twist machine is running. Therefore the only time the machine stops is to change the take up drum, which should not take longer than 10 minutes, plus the whole process only requires one operator.
Not only does the Double Twist machine give higher productivity, but when its relatively low capital cost is taken into account it gives the most economic solution.
This economic advantage is increased when the Ceeco Bartell patented roll forming technology is added to the comparison. Traditionally, a finished stranded conductor requires it’s own drawn wire diameter. Each wire diameter typically requires a new string up in the wire drawing machine. Some conductor designs require more than one drawn wire size. Similarly multiple set ups at the strander are necessary. The set up time taken on both the drawing and stranding machines, combined with inventory levels that are necessary to manage the number of wire diameters, represent unnecessary activities that add to the conversion cost from rod to strand.
The Single Input Wire (SIW) mentality eliminates much of this unnecessary activity associated with the traditional set up using the same input wire diameter to finish a range of stranded conductors. This results in:
• Increased wire drawing output.
• Reduced wire drawing die inventory.
• Reduced scrap.
• Significantly lower work in process.
• Minimum strander payoff changes.
• Increased strander output.
• Enhances J.I.T. manufacturing mentality.
• Streamlines overall stranding process.
• Significant reduction in the variables that the manufacture needs to manipulate in the manufacture of any strand program. | |
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