| 摘要 |
1. Claims for the Contracting States : DE, FR, IT A process for reducing the frictional forces in the production of cartridge tubes, wherein a tube having a diameter of 15 to 25 mm and a wall thickness of 1 to 5 mm is first extruded from an HD polyethylene moulding material having a density of 0.941 to 0.945 g/cm**3 , a viscosity number of about 310 cm**3 /g and a melt flow index MFI 190/5 of 0,3 to 0,45 g/10 min and MFI 190/21, 6 of 12 to 18 g/10 min, the tube is drawn longitudinally at a ratio of 1:5 to 1:8 in a longitudinal stretching device at a temperature of 120 to 135 degrees C and is then stretched transversely at a ratio of 1:1.2 to 1:1.8 by means of a calibration case, is provided with fluting and is cooled, which comprises using an HD polyethylene moulding material containing 0.01 to 2% by weight, relative to the polyethylene, oleic acid amide, erucamide, biste-aroyl ethylene diamine or a salt and/or an ester of technical montanic acid or a mixture of the before-mentioned compounds. 1. Claims for the Contracting State : ES A process for reducing the frictional forces in the production of cartridge tubes, wherein a tube having a diameter of 15 to 25 mm and a wall thickness of 1 to 5 mm is first extruded from an HD polyethylene moulding material having a density of 0.941 to 0.945 g/cm**3 , a viscosity number of about 310 cm**3 /g and a melt flow index MFI 190/5 of 0,3 to 0,45 g/10 min and MFI 190/21,6 of 12 to 18 g/10 min, the tube is drawn longitudinally at a ratio of 1:5 to 1:8 in a longitudinal stretching device at a temperature of 120 to 135 degrees C and is then stretched transversely at a ratio of 1:1.2 to 1:1.8 by means of a calibration case, is provided with fluting and is cooled, which comprises using an HD polyethylene moulding material containing 0.01 to 2% by weight, relative to the polyethylene, oleic acid amide, erucamide, bistearoyl ethylene diamine or a salt and/or an ester of technical montanic acid or a mixture of the before-mentioned compounds. |
