What is the difference between a splice and a knot why is a splice superior?
- The yarns in a knot cross over one another. The crossed yarns act as crude knives, and tend to cut each other. The result is that knots are not particularly strong, usually no better than 60% of that of the whole yarn.
- A good splice is a tightly-bound structure; its strength comes from the intermingling of individual fibres. This form is inherently stronger; the breaking strength of a splice commonly exceeds 90%.
- Also, a good splice appears much lower and smoother than a knot, and the splice passes more freely through the elements of textile machines. The splice is usually less visible than a knot in the finished fabric.
- Overall, splices reduce waste, in processing and in the finished fabric. As a consequence, although a typical splice takes somewhat longer to make than a corresponding knot, the downstream benefits of processability and quality enhance the overall efficiency.
How consistent is the strength of a splice?
How does splice strength change with applied air pressure?
How does splice performance change with increasing yarn count?
How does splice performance change with increasing splice length?
Can really big yarns be spliced? What is the absolute upper limit of count?
Why are knives needed on most splicers?
Why are some splicers NOT fitted with knives?
What is the significance of a blast timer? Should one always be fitted, or not?
Why may it be necessary to change splicing chambers?
What are the principles of splicing partially-orientated yarn (P.O.Y.)?
Is it possible to splice highly-twisted yarns?
- One approach was to make a standard “cross-over” or “ends-opposed” splice, by applying reverse-twist to each yarn with a mechanical device, to open the structure. This approach works very well, but it requires the use of complex splicers.
- A simpler approach was to de-twist the yarns with air, using splicing chambers with a special asymmetric cross-section to spin the bundle and open up the yarns. This approach works only if both yarns enter the chamber from the same side, so that they are both de-twisted. The result is rather a crude splice, ( “ends-together” ) but one which is OK for non-critical uses. Chambers of this form were in production far about twenty years. They suffered from a disadvantage that, although they could handle twisted yarns satisfactorily, their dimensions and characteristics needed to be matched to the twist direction and physical size of the yarns.
Is it possible to splice intermingled yarns?
Can mono-filaments be spliced?
Can fibrillated tapes be spliced?
- smash the tape so that it separates into its crude filaments
- splice the filaments.