These methods measure two key properties of the adhesive: its adhesive strength which determines how well the tape will adhere to another surface and cohesive strength which shows how well the adhesive will stick to the cloth backing. One common method of evaluating these properties involves applying the tape to a standardized stainless steel plate, and then measuring the force required to rip it off. The plate is then examined to determine how much, if any, of the adhesive residue is left behind.
The adhesive coating itself is monitored to evaluate how well it sticks to its backing. Conditions where the adhesive leaves a residue is known as creeping, crazing, oozing and bleeding. Quality control technicians also watch for fisheyes, the term used to describe an uneven application of adhesive.
In addition to the standard tests, each manufacturer has their own proprietary methods for evaluating their products.
For example, companies may measure the duct tape's breaking point. Others evaluate the "scrunch" sound of the tape as it unwinds because consumers believe a noisy rip off the roll is a sign of strength.
Other tests are designed to measure quick stick. One way this is done is by shooting ping-pong balls at tape strips with the sticky side up to measure how far they roll before they are stopped by the tape.
Despite duct tape's reputation for superior adhesion, testing done by independent researchers has found that the tape does not work as well as it is intended to. They designed an accelerated aging test that mimicked the temperature conditions of a home or office building from night to day and winter to summer.
They used a series of standard finger joints which connected a smaller duct to a larger one. Wrapping each test connection with a different brand of duct tape, they evaluated the seal under temperature and humidity conditions designed to be similar to those found in home heating and air conditioning systems. The researchers also performed a bake test in which the sample joints were baked at higher temperatures.
However, the tape industry disputed these findings, claiming that for optimal efficiency their tape products should be assisted by collars or clamps.
Environmental and price considerations drive researches to identify new adhesive formulations at a lower cost—general price for one 2 in 5 cm wide, 50 yd 46 m roll of all-purpose duct tape is about three dollars—that maintain high functionality with-out being damaging to the environment. In addition, marketing considerations drive product improvements. In response to criticism that duct tape does not function well at extreme temperatures, manufacturers are creating more advanced formulations specially designed to withstand severe heat and cold fluctuations.
For the first time, formal standards are being created specifically for duct tape to be used on flexible duct work. Tape manufacturers support this plan because they believe that certification by Underwriters Laboratories a product safety testing organization will boost their sales.
Berg, Jim, and Tim Nyberg. The Duct Tape Book. Satas, Dontas. Manco, Inc. Manco Inc. This tape becomes recognized as rolling on smoothly and quietly without the frustration of the tape tearing. Duck Brand. It makes it easy to hand tear and keeps the tape stuck to a surface once it's laid down. Finally, there's the backing. The backing is made from polyethylene, the same plastic material used to make bags and shampoo bottles. Once the backing is ready, all of the materials are put together.
Ashley Luke: So there's basically two ways that the backing can be incorporated into the tape: either laminated or co-extrusion.
The co-extrusion basically melds together the backing, the cloth, and then the adhesive. So it gives you a stronger tape that won't delaminate. It's gonna be really good in different weather applications. Narrator: Once the layers are combined, the strength of the cloth and the plastic-like nature of the backing combine to give the tape the strength and durability we know and love. The tape comes out in one jumbo roll that weighs over a ton. Each giant roll can produce over 30, small rolls.
To get it to a smaller size, the roll is sliced into strips. Then, the smaller tape strips are put into cores and rerolled. Finally, the tapes are placed in their final packaging, sent down the conveyor belt, and put into boxes for shipment. Personal Information. Company Information. Contact Information. Your Message. Newsletter Policy. The long history of duct tape.
The early history of duct tape That product was made of a thin stripe of duck fabric, with a plastic coat and a layer of rubber-based adhesive. The Fifties: when duct tape became duct tape During the Fifties, duct tape was employed in the construction sector to wrap air ducts , with the production of grey colored tapes that could camouflage on the tin.
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