Search results
Results from the WOW.Com Content Network
Rubber elasticity is the ability of solid rubber to be stretched up to a factor of 10 from its original length, and return to close to its original length upon release. This process can be repeated many times with no apparent degradation to the rubber. [1] Rubber, like all materials, consists of molecules.
At that time, stamp adhesives consisted of naturally occurring raw materials such as molasses, potato starch and occasionally fish glue, but these performed poorly. So, the stamps either stuck together or fell off prematurely and emitted an unpleasant odour. In addition, the stamps had to be moistened before fixing, which was often done by licking.
A typical PSA tape consists of a pressure-sensitive adhesive (the sticky part of the tape) coated to a backing material. To prevent the adhesive from sticking to the backing when wound in a roll, a release agent is applied to the backing or a release liner is placed on the adhesive.
These properties are dependent, among other things, on the formulation, coating thickness, rub-down and temperature. " Permanent " pressure-sensitive adhesives are initially pressure-sensitive and removable (for example to recover mislabeled goods) but after hours or days change their properties, by becoming less or not viscous, or by ...
The first U.S. postage stamps used starch-based adhesives when issued in 1847. The first US patent (number 61,991) on dextrin (a starch derivative) adhesive was issued in 1867. [10] Natural rubber was first used as material for adhesives in 1830, [18] which marked the starting point of the modern adhesive. [19]
Rubber's ability to sustain large deformations with relatively little damage or permanent set makes it ideal for many applications. Pages in category "Rubber properties" The following 31 pages are in this category, out of 31 total.
With modern laser-engraving technology, personalized rubber stamps can be made in minutes. Rubber stamps for business commonly show an address, corporate logo and business registration number. [5] [6] Some stamps also have movable parts that allow the user to adjust the date or the wording of the stamp. They are used to date incoming mail, as ...
For rubber and biological materials, more sophisticated models are necessary. Such materials may exhibit a non-linear stress–strain behaviour at modest strains, or are elastic up to huge strains. These complex non-linear stress–strain behaviours need to be accommodated by specifically tailored strain-energy density functions.