The invention relates to a method for surface treating a substrate (28) by means of an electrical corona discharge, wherein aerosols (5) are sprayed into discharge area defined by an active gap formed between a corona electrode and the substrate (28) during the discharging, designed such that the aerosols (5) are sprayed substantially opposite the direction of gravity.

The invention relates to a method for surface treating a substrate (28) by means of an electrical corona discharge, wherein aerosols (5) are sprayed into discharge area defined by an active gap formed between a corona electrode and the substrate (28) during the discharging, designed such that the aerosols (5) are sprayed substantially opposite the direction of gravity.

Surface modification device forms a discharge area E1 between a discharge electrode 6 and a counter electrode 4, supplies substitution gas to the discharge area E1, and modifies the surface of the base material to be processed. The surface modification device comprises; a slit-shaped substitution gas passage; and cover members 7, 8 that form curtain passages 22, 23 in spaces facing the discharge electrode. While the substitution gas is being supplied to the discharge area E1, gas injected from the curtain passages 22, 23 prevent the inflow of an entrained flow a and the outflows b1, b2 of the substitution gas, thereby maintaining the concentration of substitution gas inside the discharge area E1.

The present disclosure relates to a surface treatment method for a polymer film and to a use of a surface treated polymer film according to this method in the production of packaging material, in particular food packaging. The surface treatment method for a polymer film comprises providing information about at least the polymer film to a surface treatment device (102), adjusting at the surface treatment device at least one of a discharge of ions and a residence time of the polymer film in the surface treatment device based on the information (103), and applying the discharge of ions to a surface of the polymer film during the residence time of the polymer film in the surface treatment device to obtain a treated surface of the polymer film (104).

The present disclosure relates to a surface treatment method for a polymer film and to a use of a surface treated polymer film according to this method in the production of packaging material, in particular food packaging. The surface treatment method for a polymer film comprises providing information about at least the polymer film to a surface treatment device (102), adjusting at the surface treatment device at least one of a discharge of ions and a residence time of the polymer film in the surface treatment device based on the information (103), and applying the discharge of ions to a surface of the polymer film during the residence time of the polymer film in the surface treatment device to obtain a treated surface of the polymer film (104).

A discharge electrode E in an electrode chamber C is formed of a pair of electrode members 8 and 9 having lengths equal to or greater than a width of a film F. Also, the pair of electrode members 8 and 9 are disposed facing each other so as to sandwich a support member 4 there-between, which has nearly the same length as to electrode members; a gap is formed in a section in which the pair of electrode members 8 and 9 face each other; and this gap is open at a tip of the discharge electrode so as to serve as a gas pathway 15. Meanwhile, in the aforementioned support member 4, a plurality of gas guiding holes 5 are formed in a longitudinal direction thereof, and the gas guiding holes are in communication with a gas supplying system.

A discharge electrode E in an electrode chamber C is formed of a pair of electrode members 8 and 9 having lengths equal to or greater than a width of a film F. Also, the pair of electrode members 8 and 9 are disposed facing each other so as to sandwich a support member 4 there-between, which has nearly the same length as to electrode members; a gap is formed in a section in which the pair of electrode members 8 and 9 face each other; and this gap is open at a tip of the discharge electrode so as to serve as a gas pathway 15. Meanwhile, in the aforementioned support member 4, a plurality of gas guiding holes 5 are formed in a longitudinal direction thereof, and the gas guiding holes are in communication with a gas supplying system.

A discharge electrode E in an electrode chamber C is formed of a pair of electrode members 8 and 9 having lengths equal to or greater than a width of a film F. Also, the pair of electrode members 8 and 9 are disposed facing each other so as to sandwich a support member 4 there-between, which has nearly the same length as to electrode members; a gap is formed in a section in which the pair of electrode members 8 and 9 face each other; and this gap is open at a tip of the discharge electrode so as to serve as a gas pathway 15. Meanwhile, in the aforementioned support member 4, a plurality of gas guiding holes 5 are formed in a longitudinal direction thereof, and the gas guiding holes are in communication with a gas supplying system.

A discharge electrode E in an electrode chamber C is formed of a pair of electrode members 8 and 9 having lengths equal to or greater than a width of a film F. Also, the pair of electrode members 8 and 9 are disposed facing each other so as to sandwich a support member 4 there-between, which has nearly the same length as to electrode members; a gap is formed in a section in which the pair of electrode members 8 and 9 face each other; and this gap is open at a tip of the discharge electrode so as to serve as a gas pathway 15. Meanwhile, in the aforementioned support member 4, a plurality of gas guiding holes 5 are formed in a longitudinal direction thereof, and the gas guiding holes are in communication with a gas supplying system.

Surface modification device forms a discharge area E1 between a discharge electrode 6 and a counter electrode 4, supplies substitution gas to the discharge area E1, and modifies the surface of the base material to be processed. The surface modification device comprises; a slit-shaped substitution gas passage; and cover members 7, 8 that form curtain passages 22, 23 in spaces facing the discharge electrode. While the substitution gas is being supplied to the discharge area E1, gas injected from the curtain passages 22, 23 prevent the inflow of an entrained flow a and the outflows b1, b2 of the substitution gas, thereby maintaining the concentration of substitution gas inside the discharge area E1.