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BOBST - Laminating machines

Các máy ghép màng - Laminating machines

The growth of the flexible packaging industry has led to an increased need for high quality and technically demanding composite structures. Since the 1960's BOBST, through its Rotomec product line, has been offering laminating machinery that complements its range of high performance gravure printing and converting equipment.
The continuous success of BOBST laminating machinery is quite simply because the strengths of the equipment are consistent with what is important to its users - ease of operation, high performance, little wastage and low impact on the environment.

CL 750D
Compact, easy, powerful
CL 850D
CL 850TD
CL 1000D
CL 1000TX
SL 850
SL 850HP
SL 1000
SL 1000HP
 

Laminating process

Laminating is the process through which two or more flexible packaging webs are joined together using a bonding agent. The substrates making up the webs may consist of films, papers, or aluminum foils. In general terms an adhesive is applied to the less absorbent substrate web, after which the second web is pressed against it to produce a duplex, or two-layer, laminate.
 

Applications

Web laminating is used to improve the appearance and barrier properties of substrates.
The choice of the most suitable web laminating process is mainly dictated by the end-use of the product. A number of different technologies are available that cover the wide variety of applications in the food and non-food packaging industries, as well as for the manufacture of technical laminates for the solar energy and insulation panel sectors.

Laminating machinery and laminating types

Laminating machinery can be classified according to the type of bonding agent used to produce the laminates. These types are:
  • Wet lamination: where the bonding agent is still in a liquid state when the webs are joined together. It is commonly used to produce a paper-aluminum foil laminate that is widely used in flexible packaging
  • Dry lamination: where the bonding agent, dissolved into a liquid (water or a solvent), is applied to one of the webs, before being evaporated in the drying oven. The adhesive coated web is laminated to the other under strong pressure and using heated rollers, which improves the bond strength of the laminate
  • Wax lamination: where the bonding agent is a wax or hot melt and is applied in a molten state onto one of the two substrates. This process allows the production of paper-paper or paper-aluminum foil laminates that are widely used for the packaging of biscuits and bakery products
  • Solventless lamination: where the adhesives used do not contain solvents. Solventless adhesive generally indicates a specific type of adhesive composed by two components reacting with each other and consequently not requiring drying.
The resulting laminated web is then rewound into a finished roll.

BOBST expertise and knowledge

BOBST laminator machines from its Rotomec range are tailored to the specific requirements of converters in order to fulfill the demand for maximum quality and efficiency. The range of laminating machinery available covers duplex, duplex tandem, and triplex solutions, and provide the kind of functional, operator-oriented, waste-saving and eco-friendly technical solutions needed by industry to achieve the fastest and most consistent levels of performance.
 

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 0.18mm 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. 
 
Aluminium foil
Aluminum is produced from bauxite, an ore abundant in nature. From the rolling mill, aluminum foils emerge with a natural shiny finish, almost as bright as a mirror, but also can be produced with an as-rolled, satin-like finish called matte.
Aluminum foil has all of the unique functional characteristics of the aluminum alloy from which it is made.
Because of its exceptional barrier properties, aluminum foil is used across a wide range of flexible and other packaging applications to protect foods, drugs, cosmetics, and a lengthy list of other items, most often in combination with other packaging materials.
 
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.

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