EXTRUSION-MOLDED PRODUCT HAVING WAVELIKE INNER SPACES, APPARATUS AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed is an extrusion-molded product having wavelike spaces. The extrusion-molded product has wavelike spaces formed therein in such a manner that the swell ports of the wavelike nozzles mounted in an extrusion mold repeatedly perform shrinkable and expandable movements when a non-flowing material such as synthetic resin or mortar is extruded. As a result, the wavelike spaces interrupt air-flow in the extrusion-molded product and improve the thermal resistance of the product. Further, it is possible to reduce the quantity of material used and to produce a light extrusion-molded product. The extrusion-molded product may have a single layer or plural layers of wavelike spaces arranged in the same direction. The wavelike spaces include shrink portions and expansion portions repeatedly arranged.