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BOBST - Vacuum coaters & metallizers

Các máy tráng phủ và trang kim kiểu chân không - Vacuum coaters & metallizers

Designed for wide web processing, BOBST vacuum coating and metallizing machinery is characterized by minimal downtime and superb quality at high speeds, which is why General product line is noted as the world's premier supplier of vacuum coating and metallizing solutions for barrier, decorative, security and high technology applications.


K5 EXPERT
Highest productivity metallizer in the world for the packaging industry
K5000
Engineering excellence
K4000
Complete Flexibility
K3000
PET Metallizing
CVD Technology
Production Scale PECVD SiOx
OPTILAB
Pilot scale sputtering machine
OPTICOAT
Production scale sputtering machine
 

Vacuum coating and metallizing process

Vacuum coating and metallizing is the process of adding a thin film of aluminum or other coating to a material.
In principle, the process calls for the evaporation of the coating material inside a vacuum chamber, after which it condenses onto a web of substrate as it passes through.
Paper and film metallizing is utilized in the packaging and decorative market segments. The barrier and decorative markets are noted for their wide variety of products from beer labels to chip bags.
 

Vacuum coating machines

A vacuum coater, also referred to as a vacuum metallizer or barrier coating machine, consists of a vacuum chamber which has been evacuated to, typically, 0.0005 mbar.
Inside this chamber, aluminum wire is fed onto individual, resistance-heated inter-metallic evaporators, where the aluminum becomes molten and evaporates.
The flexible substrate, supported on a chilled process drum, passes over the evaporation source at speeds of up to 1000 m/min. The aluminum vapor condenses onto the substrate and so creates the coating layer.
 

Plasma treatment

A plasma treatment unit can also be used as part of a vacuum coater system in order to enhance metal adhesion and/or to improve the substrate's qualities as a barrier against oxygen and water vapor transmission. Here, the surface of the web is hit by plasma just prior to the coating process.
The plasma is formed by applying an electrical voltage to a gas, or combination of gases. In addition to removing moisture and other contaminants, plasma treatment acts to increase the number of nucleation sites by the introduction of polar groups, resulting in a coating with a homogeneous surface morphology and fewer defects.
 

Applications

The vacuum coater is used to deliver aesthetic improvements to flexible substrates and/or to reduce oxygen and water vapor transmission to levels similar to that of glass and metal containers. This delivers improved packaging performance, extends pack shelf life and maintains the quality of the packaged product.
The process can also be used to produce substrates which conduct electricity, save energy, control light transmission or reflection, and which can even help prevent counterfeiting or theft.
 

BOBST expertise and knowledge

Through its General product line, BOBST has formidable expertise in the vacuum coating process and in handling flexible substrates. This has led to the development of high technology vacuum coating and metallizing lines that can be used to produce a wide variety of products.
 

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. 
 

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