Abstract: The invention provides an on-line continuous method for producing a masking film roll to be used in painting, comprising corona-discharging the inner surface of a tubular film of a polyolefinic resin, cutting the tubular film open, folding the film in the lengthwise direction in a particular manner, partly attaching an adhesive tape to the film along its lengthwise one edge in such a manner that the adhesive surface of the tape is made to face the corona-discharged surface of the film and that the thus-attached tape is left to have a non-attached part in its lengthwise direction, and winding up the film around a tubular core to be a roll, provides the masking film roll as produced by the method in which the adhesive surface of the adhesive tape attached to thereto faces opposite to the non-corona-discharged surface of the uppermost layer of the folded film, and provides a tubular film of a polyolefinic resin from which the masking film of the invention is produced and of which the inner surface has been coron

Abstract: A functional polyolefinic(tubular) film combined with an inorganic filler (such as CaCO.sub.3) having a thickness of 5-150 .mu.m, which is applied in a corona discharge at a high voltage current of 50-3,000 W/m.sup.2 /min. A process for manufacturing that film. Products obtained from that film [packaging bag, adhesive-backed sheet and adhesive tape (such as tape for adhesive masking film for coating)].

Abstract: The invention provides an on-line continuous method for producing a masking film roll to be used in painting, comprising corona-discharging the inner surface of a tubular film of a polyolefinic resin, cutting the tubular film open, folding the film in the lengthwise direction in a particular manner, partly attaching an adhesive tape to the film along its lengthwise one edge in such a manner that the adhesive surface of the tape is made to face the corona-discharged surface of the film and that the thus-attached tape is left to have a non-attached part in its lengthwise direction, and winding up the film around a tubular core to be a roll, provides the masking film roll as produced by the method in which the adhesive surface of the adhesive tape attached to thereto faces opposite to the non-corona-discharged surface of the uppermost layer of the folded film, and provides a tubular film of a polyolefinic resin from which the masking film of the invention is produced and of which the inner surface has been coron