QTY. 1. DAVENTEST LIMITED

QTY. 1. DAVENTEST LIMITED DAVENPORT FILM BLOCKING APPARATUS. FILM BLOCKING APPARATUS S/N: FBB626/64 A.S.T.M. D:3354-74 110-120V 60Hz BLOCKING IS THE TERM USED TO DESCRIBE THE ADHESION WHICH CAN DEVELOP BETWEEN TOUCHING LAYERS OF PLASTIC FILM. IT MAY ARISE FROM PROCESSING FROM STORAGE OR FROM USE AND USUALLY ARISES FROM ONE OR MORE OF THE FOLLOWING: VERY SMOOTH FILM SURFACES ALLOWING EXTREMELY CLOSE CONTACT AND ALMOST COMPLETE EXCLUSION OF AIR; PRESSURE INDUCED FUSION OF THE ADJACENT SURFACES; TEMPERATURE INDUCED FUSION OF THE SURFACES. THE DAVENPORT FILM BLOCKING APPARATUS IS DESIGNED TO MEASURE THE BLOCKING LOAD IN GRAMS WHERE THIS IS DEFINED AS THE FORCE IN GRAMS WHICH WILL CAUSE TWO LAYERS OF BLOCKED FILM (THE APPARATUS IS NOT INTENDED TO MEASURE THE SUSCEPTIBILITY TO BLOCKING) TO SEPARATE. THE TEST - IN THE STANDARD MACHINE - IS LIMITED TO A MAXIMUM LOAD OF 100 GF.