APPARATUS FOR MONITORING MECHANICAL PROPERTIES OF A MOVING FILAMENTARY OR PLANAR BODY AND MONITORING PROCESS

摘要

Disclosed is an apparatus and a method for monitoring mechanical properties of a moving filamentary or planar body.The apparatus is characterized by the presence of the elements: a) means for causing a movement of the body along a predetermined passage, wherein in at least a part of the passage the body is levitating, b) means for generating deflection and/or elongation of pre-determined length of the body which is positioned in that part of the passage, wherein the body is levitating, or which is positioned at the beginning or at the end of the predetermined passage, c) means for metering a force and/or a change of velocity of the moving body created by the deflection and/or elongation of the body, and d) means of calculating a mechanical property using the length of deflection and/or elongation of the body and the force created by said deflection and/or elongation. The apparatus can be used for on-line monitoring of mechanical properties of filaments or films after compounding and extrusion. The apparatus detects mechanical properties on-line so that the process is not interrupted. Between processing, extrusion and testing no further process step is necessary, like cutting, punching or injection molding. This results in an acceleration of development time in combinatorial development processes and in a simple and reliable technique to monitor process parameters of filament and film production lines on-line.