Aerosol container

To produce an aerosol container that was light and relatively inexpensive tin-plated steel was used for aerosol containers. The container also may be constructed of aluminum or coated aluminium (to prevent interaction with the product).

Other materials have been employed including glass, plastic-coated glass and polycarbonate. The tin-plate aerosol can is a 3-piece can with atop a bottom and the body all seamed together.

To keep all the particles squashed together and inside the small container, it is necessary to push hard and to keep pushing hard. The particles still have all the energy they had before and so they move around lot and hit the sides of the container with a lot of force.

This hitting of the particles against the wall of the container means that there is a pressure from the container pushing outwards all the time.
Aerosol container

Packaging of food

Packaging has become an integral part of the processing, preservation, marketing and even the cooking of foods.

Initially, packages served simply to contain products and to protect them from outside contamination. However, there has been tremendous growth in the development and design of new packages to fit specific needs.

While there has been adaptation of many of the traditional packaging materials, e.g paper, glass, and metals (tin, steel, and aluminium), much of the growth has been due to development of plastic or flexible packaging materials.

Packaging materials may be composed of single component (usually one chemical substance polymeric, building block form) or they may be composed of multiple components, consisting of the variety of materials, usually laminated in layers, offering many advantages not provided by single components.
Packaging of food 

What is cellophane?

Cellophane means a thin, transparent cellulose material which his manufactured using the viscose process and used in food packaging, such as candy, cheese, and baked food. Other includes for fresh produce and processed meat.

It is also used as adhesive tapes, and membranes for industrial uses, such as batteries. It is an old material, flimsy and opaque and requires further treatments to render it transparent, soft and plastic. This treatment includes coating with metal or other chemicals to alter its permeability to air and water.

Cellophane has been produced since the 1930s. It is obtained by treating sulfite paper pulp with sulfur dioxide and carbon disulfide that transform the cellulose into a viscous material called viscosa. Then the viscose is extruded throughout a slit to form a sheet.

Cellophane was a favorite packaging material with potato chippers for many years. It provides sparkle and certain degree of ‘body’ to the package.

The disadvantage is that in the past it has been poor performance at low temperature and its limited shelf life. It will dry out under low humidity conditions cause package failure.

However the film is excellent for high moisture products as it allows for respiration and reduces fogging.
What is cellophane?

Coca-Cola glass bottle

Glass has one major advantage over the use of plastics so it looks expensive and therefore has the image of sophistication. Glass bottles have the advantage of being transparent and rigid.

Glass is perceived by consumers to be the most recyclable packaging material, it is seen as pure, inert and natural.

John Pemberton, who invented Coca-Cola in 1886, originally used plain bottles with paper labels to sell the Coca-Cola syrup to shops or ‘soda fountains’. Coca-Cola introduced its contour bottle design in 1899. 

Carbonated water was used and bottles so that people could enjoy the soft drink away from the soda fountains.

In 1915, Coca-cola bottlers hired the Root Glass Company to design, curved-glass Coca-Cola bottle. The curved glass bottles was different enough from other bottles that Coca-Cola was able to register it as a trademark and undoubtedly the most recognizable product package in the world.

From 60s through the 90s, the original curved bottle has been, by far the most prominently used package in television advertising for Coca-cola around the world.

In 1929, after the curved bottle pried successfully, Coca-Cola designed a special bell-shaped fountain glass for serving the soft drink. In the international marketplace glass bottles Coca-Cola is very much alive.
Coca-Cola glass bottle