Now it’s quite difficult to imagine a grocery shopping trip without a plastic bag. However, despite the mass of differences, they have something in common - a rustling sound during deformation. Why does he appear?
Package History
The first packages were invented in 1957 in the United States. Initially, they only stacked sandwiches. Over the next nine years, mainly bakery products were put inside without using other items to carry them. But since the manufacturing process was inexpensive, in the 60s they began to produce large-sized bags in which they packed products and things. The invention quickly went beyond the United States and began to be applied in other countries.
Interesting fact: in 1973, 11.6 million packages were produced and used in Europe.
In 1982, the production of registered packages for supermarkets began. Manufacturers for the first time used the “T-shirt” shape, which simplified operation thanks to the appeared handles. At the beginning of the XXI century, several trillion packages were annually produced, which were actively used by the inhabitants of the planet.
As polyethylene decomposes slowly, garbage in the form of used bags seriously harm the environment. Now scientists are looking for effective ways to quickly decompose them. For example, experiments are conducted with a certain type of mold, which in 3-4 months almost completely corrodes polyethylene soaked in nitric acid.
Why are the packages rustling?
Bags make a sound due to polyethylene.This material is easily creased and deformed, but any kinks are accompanied by cotton. Moreover, if you carefully deploy the package without crushing the structure, the process will be silent. But if you do it quickly or bend certain places at a strong angle, kinks are created, which are accompanied by rustling.
Moreover, the stronger polyethylene is, the louder it rustles. This is due to the fact that its structure is denser, and when it is deformed, a larger kink is created.
The bag rustles due to the fact that during deformation, fractures appear on the surface of the polyethylene, accompanied by claps. When a person puts things into him, dozens of them arise, because of which all sounds add up to a single rustling.