Patent ID: 6197136
Filing Date: 2001-03-06
Classification: B29C

Abstract:
A method for determining heat-sealing conditions comprising the steps of:(1) providing a pressing and heating test apparatus having two faces which face each other, at least one face being movable towards the other face for nipping an object to be heat-sealed, means for heating at least one face and means for measuring the temperature of at least one face;(2) providing a surface cover material on a heating face made of the same material as a cover sheet provided on a production heat sealer;(3) inserting a minute temperature sensor in the form of a wire having a diameter of from 5 to 50 .mu.m between surfaces of the object that are to be heat sealed;(4) positioning the object between the two faces;(5) heating the at least one face provided with the heating means to a temperature exceeding the fusing point of the surfaces that are to be heat sealed;(6) moving the at least one movable face towards the other face to nip the object;(7) measuring a time course of temperature at the surfaces that are to be heat sealed; and(8) operating the production heat sealer at a pressing period based on the temperature exceeding the fusing temperature and the measured time course of temperature to produce a heat sealed object.