
How other tying methods were developed
So why choose a rapstrap?
Because a lot of time, effort and cold hard money has gone into making it the best possible fastener you can buy. Of course there are other ways to do the job, but they all have their weaknesses. Considering them one-by-one, below is a brief study of these alternatives, and how they compare to the rapstrap.
1. Traditional Cable Ties:
During
the war there was a great need for rapidly fixing wiring looms into
aircraft. Many clamping devices were tried, but what people really
wanted couldn't be made: Plastics injection moulding didn't advance
until the 1950s. When it did, the first moulded cable
ties started to appear around 1957, and they quickly settled down
on the standard nylon design we still use today.
They may have been cutting-edge 50-years ago, but clearly we can do better.
For a start, half the cable tie gets chopped-off and thrown in the bin. And God help you if you ever have to remove the damned things!
These were the original problems rapstrap set out to solve. The bit you chop-off is now usable again and again until it runs out, and a fitted rapstrap is quick & easy to remove later on if required. Rapstraps are also easier to release, and the soft materials doesn't leave dangerous sharp edges. Check out these animations to see how it all works.
2. Sticky Tape:
Everyone
has some Sellotape®
or similar product lying around. It was a French invention first produced
in Britain in 1937 by coating natural rubber resin onto Cellophane
tape. (Cellophane
was another French invention from 1908.)
Slightly earlier inventions (1925-30) were paper masking tape and Scotch® tape, both produced by 3M's banjo-playing engineer Richard Drew. There have, of course, been numerous alternatives created since then.
On the plus side, tape is nice and cheap. For this reason, it's still a mainstay of stage wiring for many roadies out there, and it's also widely used on cable wiring looms for cars etc. However, it's not without its problems.
Finding the end of the reel is the first hurdle, and peeling it off again can be just as frustrating, especially if it leaves a sticky mess. It also exhibits the troublesome preference of sticking to itself, rather than everything you want it to.
3. String and Twine:
This
idea has been around since the stone age, when people fastened things
with lengths of leather & plant fibre. Die-hards still use the
technique, and many a top drawer contains a knotted
ball of tangled string.
It may be cheap, but it isn't always cheerful, and perhaps its best use is for fastening really big objects where more convenient tie strips are not long enough to be effective.
Its other main benefit is that you only use what you need, saving the rest till later. But then again, that's exactly how rapstraps work, and they're a whole lot simpler to use.
4. Hook & Loop (aka Velcro®):
Another
classic from the mid 20th Century, Velcro®
was invented by George
de Mestral in 1948 as an alternative to Whitcomb Judson's slide
fastener - commonly known as the zipper.
(Later improved by Gideon Sundbach, and Katharina
Kuhn-Moos & Henri Forster.)
de Mestral's idea was perfected in the mid 1950s, and by the 60s had evolved into tourniquets and clothing fasteners, especially for skiwear. The US Velcro® patent expired in 1979, and the concept succumbed to the sincerest form of flattery.
Along the way, the idea was turned into a device for tidying up messy cables, and today these kind of fabric tie strips are used quite extensively. Because they are easy to remove, they've become particularly suited for temporary fixings. And because they're softer than cable tie equivalents, they're also used a lot on high performance cables, where traditional ties can cause damage through crimping.
The downside is that they're hard to pull tight, so the grip is generally a bit sloppy. They also tend to be quite expensive (especially the branded versions), and like other cable tie strips, they can only form one loop. They also have an unfortunate habit of sticking together very easily - and to anything else around them that's fluffy.
5. Rubber Bands:
The
rubber
band is possibly one of the simplest inventions of all time. They
still draw
a crowd.
Born out of the rubber industry, British inventor Stephen Perry patented the idea in 1845 and opened the first factory. It is thought, however, that Thomas Hancock - who apparently worked with Perry - may have been the actual creator in 1843.
(Later on, Ohio based William H. Spencer re-invented the concept in 1923 using old inner-tubes.)
Perry originally made the bands for binding papers and envelopes together, and it is still the largest single use, with the US Postal Service being the world's biggest consumer.
Aside from its simplicity, a rubber band's chief benefit is being soft & stretchy, which makes it extremely safe. Unfortunately, its applications are somewhat limited because the band is already a closed loop. This means you need a wide variety of sizes, and more importantly, they can only be fitted over the open end of something, not half-way along its length.
If only there was a soft & stretchy fastener you could just loop around and pull tight as required...
6. WireTwist Ties:
These
are perhaps the crudest method of tying available (even string can
be tied with elegant knots), yet they are still surprisingly common.
Most rolls of freezer bags come with a bundle of them, and they can
also be purchased on reels and cut to size.
The exact origins of tying with wire are obscure, but must clearly relate to the origins of wire itself. The book of Exodus 39:3 mentions gold wire made of strips from hammered sheets, and certainly gold would have been the easiest metal to make wires from in antiquity.
It is highly doubtful such wires would have been much use for tying with, though - jewelery was the main application. It would also have been far cheaper to use rope or leather straps.
True drawing of wire was first described c.1100AD by Benedictine monk Theophilus ("Diversarum artium schedula"). Evidence for wires pulled through a die or drawplate are tenuous before this date, but it probably occured. Mass production didn't really start until the industrial revolution.
US patent US1164450 (filed 1912) describes a basic version of the modern coated twist tie, while US3857139 from 1973 describes a bi-colour version for bread bags. (The idea being 7 colour codes indicate the day of baking). A 1916 patent US1167466 also describes packing tape with wire running through it and US2767113 discloses a PVC plant tie version of the same concept, plus a way of making it by sandwiching the wire between two tapes.