Processed materials

Paper

Paper is a fibre-based material produced from wood, rags or organic material. The types of paper used in the packaging and graphic arts industries typically use wood and/or recycled paper and board, which is then chemically or mechanically processed to produce cellulose pulp. This pulp is bleached and processed in a paper making machine to produce reels of paper which may optionally be coated or finished to provide a better surface and/or improved visual appearance.

Paper may be between 0.07 mm and 0.18 mm thick, with paper for printing and packaging applications generally being in a range between 60 and 120 gsm. The crossover point between paper and board is normally considered to be around 160 grams per square meter (gsm), as it is only at this level that a fibrous material is likely to be stiff and rigid enough to make a container.

Paper has a wide range of industrial applications including use for the packaging of products as diverse as confectionery and cigarettes, as a component in packaging laminates, and for many commercial print uses.

Film

A film is usually characterized as a thin synthetic resin layer. There are many types of films and their use depends on their physical and chemical properties, which make them especially suitable for a given application.

The most commonly used plastic films are low density polyethylene (LDPE), Polypropylene (PP), bioriented polypropylene (BOPP), and polyester (PET).

Printed film is used for packaging, display materials, stickers, seals, and a wide range of other graphic applications.

Films are generally characterized by their basis weight, expressed in g/m²; and thickness, expressed in microns. For some films it is also useful to know their density, expressed in g/cm3.

The increasing awareness of environmental issues is intensifying research into film substrates derived from renewable sources that are compostable. 

Laminates

A laminate is a material that can be constructed by bringing two or more layers of material together. This can include different material combinations from a wide spectrum of flexible substrates including thin aluminum foil, film, and paper. These materials have different physical properties and varying thicknesses that combine to provide the required barrier performance.

Converted single- or multi-layer webs are used in a number of industries, from the packaging of food and non food products to industrial applications including the photovoltaic industry.