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EB for non-thermal Crosslinking/Vulcanisation of coatings

 

Considering that some years ago solvent free systems savings in energy or low space requirements were the main arguments in favour of irradiation of surfaces to dry lacquer with low-energy electrons come to the fore:

High scuff resistant coatings
Controlled, calculable, through-curing
Immediate stacking or subsequent treatment of the materials
High flow rate, substantial increase in production speed in comparison to heat treatment methods
Constant product quality, precise maintain crosslinking and vulcanising process conditions through very high dose precision over working width, depth of material and production time
Considerably lower extraction values compared to UV-curing, processing without photoinitiators
Acceptable costs at appropriate quantities
Minimal temperature increase through radiation process; therefore no migration of low boiling components from the coating material. No change of moisture level in the substrate.

Today electron-beam curing (non-thermal curing) in used industrially for the surface technology in the following fields:

Curing of pigmented lacquers on doors
All-around curing of lacquers on mouldings
Controlled through-curing of coatings on finished parquet
High scuff-resistant floor-coverings
Production of high-gloss surface in the board industry
Curing of coatings on furniture foils (lacquer from the roll)
Crosslinking of Lacquer on top of papers for the production of HPL (high-pressure Laminate) - and CPL (Continuos-Pressure Laminate)-material with lacquered surface
Curing of coating on boards with UV-/EB-curing processes
Even Crosslinking of pressure-sensitive adhesive masses (Tesakrepp-material) to increase temperature stability
Drying of printing inks

 

Controlled, calculable through curing

Electron-beam irradiation is calculable and is determined by 3 factors:

Acceleration voltage as the measure for the penetration depth of the electrons.

Electron current

It determines the possible flow rate. The applied irradiation dose D is connected with the electron current I and the web speed v as follows with k as equipment factor.

with k as equipment factor.

The formula above shows the following details:

Dose and electron current are directly proportional.
If the proportion of electron current and speed is constant, you will receive reproducible and saleable products in all production phases including when starting up and shutting down the plant.
The accelerator only takes power of the main supply according to the web speed.
Quality protection is possible when using this formula.

Working width

The width of the electron-bean exit window has to be adjusted to the max. working width (object width).

Electron Crosslinking AB electron-beam accelerators

The function of our electron-beam accelerators can be compares to a cathode ray tube of a TV-set.

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Fig. 1    Cathode ray tube and Electron Crosslinking AB electron-beam accelerator

 

By means of flow of electron current a heated tungsten cathode puts free electrons at its surface to disposal in high vacuum. These negative charged particles (or waves) are accelerated by a negative voltage in direction to the anode and then deflected over the screen at cathode ray tubes or the electron-beam exit window at electron-beam accelerators. With the accelerator these electrons can pass though a thin titanium foil from vacuum out into the air or inertgas, where they can act on the object.

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Performance for Electron Crosslinking AB Accelerators

Acceleration voltage 80 - 300 kV
Electron flow per cathode max. 200 mA
Working width 200 - 2000 mm
Electron flow per cm window length max: 3,2 mA/cm
Speed of web at 10 kGy up to 800 m/min
Distribution of dosage over working width better ± 5 %
Productive penetration depth of electrons max. 390 g/m2 -incl. metals also-
No cooling of electron exit window necessary.
The radiator may be installed in any position whatsoever.
No measurable X-radiation outside protective screen.

 

Enquiries of process or principle trials direct to the developer and manufacturer of electron radiation systems:

Click here to view this brochure in PDF-format, English (165 KB).


For More Information Contact:

ELECTRON CROSSLINKING AB
Skyttevägen 42
SE-302 44 Halmstad
Sweden

Tel: +46 (0)35 15 71 30
FAX: +46 (0)35 14 82 06

 

 

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