| 摘要 |
PURPOSE:To prepare a resin film with MI of 10 or more in good yield, by performing multi-layer inflation film formation by using a resin with MI of 10 or more and a resin with MI of 8 or less before mutually separating the formed films. CONSTITUTION:Multi-layer inflation extrusion film formation is performed by using a resin with a melt index (MI) of 10 or more and a resin with MI of 8 or less and the formed films are mutually separated. For example, polyethylene with MI=3 is extruded from one extruder and polyethylene with MI=30 is extruded from the other one and both of them are supplied to an extrusion dual- layer circular die to form polyethylene films wherein the inside is polyethylene with MI=3 and the outside is one with MI=30 while the formed films are blown up to a dual-layer bulb. Thereafter, this bulb is folded by a nip roll and a knife is inserted into the bulb at the folded point to open the same to form two right and left films which are, in turn, peeled off by separate peel-off rolls and wound to obtain the polyethylene film with MI=30.
|
