| 摘要 |
PURPOSE:To increase adhesive strength of center sealing by constituting a tube of a polyolefine-based film low in wettability and to provide a center sealing method wherein the tube is efficiently formed in a continuous line. CONSTITUTION:The edge part 11a of one side in the right and left edge parts 11a, 11b of the printing face 11.1 of a base film 11 is coated with an adhesive layer 13. Corona discharge treatment is applied to the edge part 11b of the surface 11.2 of the other side and the part thereof is activated. Corona discharge treatment is applied to the edge part 11b of the surface 11.2 of the side opposite to the printing face and the part thereof is activated. The part may be coated with the adhesive layer 13. Activation of the surface of the edge part by means of the corona discharge treatment, coating of the adhesive layer 13 and center sealing of the right and left edge parts in order to form a tube are performed under continuous transfer of the film. |
