| 摘要 |
PURPOSE:To obtain a molded product, such as rope or not, used in the sea, consisting of a linear material having a tensile strength, tensile elastic modulus and void ratio within specific ranges and having effects on prevention of organisms from attaching for a long period with hardly any deterioration in mechanical properties. CONSTITUTION:For example, polyoxymethylene is melted in an extruder, normally extruded at 180-220 deg.C and cooled with a cooling medium, such as air, water or ethylene glycol, and the resultant undrawn material is drawn at 100-200 deg.C in one or many stages using, e.g. an external hot-pressing method and/or dielectric heating method, to provide a polyoxymethylene wiry material having >=0.9GPa tensile strength, 10-50GPa tensile elastic modules and <=10% void ratio. For example, a number of the above-mentioned wiry materials are twisted or blended with a linear material, such as polyolefin or polyester, to produce the aimed molded product, such as rope for fixed nets or buoy.
|
