When plastic film is extruded and molded, the film blank extruded from the molding die is generally stretched in order to increase the strength and improve the transparency of the finished product. In practice, also film extrusion stretch molding refers to stretch molding of film sheets formed by the extrusion casting method and the drafting method.
In addition to the performance characteristics of high-density polyethylene flat film, the more prominent properties of high-density polyethylene film are high tensile strength, high breaking strength, and good transparency. This kind of film is widely used in food packaging, especially in the candy class for twisted packaging when the application is relatively large.
(1) raw material selection should be selected for unidirectional stretching with high-density polyethylene resin, 3300F-type resin, its density of 0.954g/cm', melt flow rate MFR = 1.2g/10min; can also be used in silk molding resin 5000S-type, but the resin needs to be added to the 1.5% of the polyethylene oxide octadecylamine as a lubricant.
(2) equipment high-density polyethylene flat film extrusion molding after unidirectional stretch film production molding, the main components of this production line in the equipment are: single-screw extruder, hanger-type (T-type) molding die, cooling and shaping of the Kun, hauling device, tensile editing, electrostatic treatment device, cutting device and winding device, and so on.
Nanjing Suminoe Precision Machinery Co., Ltd. has professional sheet production line, the company's main sheet machine manufacturing production line: PET/PRET sheet production line, PP sheet production line, PP vacuum profile extrusion line, PP/PC vacuum sheet production line, PC/PP corrugated sheet production line, PVDF photovoltaic backing sheet production line, PMMA acrylic sheet production line, PE waterproofing membrane production line, high-performance barrier sheet production line. High-performance barrier sheet extrusion line, optical panel extrusion line, multilayer co-extrusion sheet extrusion line, etc.
