THE USE OF AN INFRARED RADIOMETRIC MICROSCOPE IN THE NONDESTRUCTIVE DETERMINATION OF FLEXIBLE PACKAGE SEAL DEFECTS

Abstract

Infrared radiometry, whereby changes in heat conduction through the seal thickness and the resulting effect on the thermal radiation characteristics of the opposing seal surface are measured by an infrared radiometric microscope, has been used to detect significant defects in flexible package seals. Sample manipulation techniques and measurement parameters have been established to the extent that occluded matter such as single sugar crystals, 0.5-milligram amounts of meat fibers, single fruit and vegetable fibers and traces of moisture, as well as significant seal wrinkles, and the presence of small voids (90 to 100 microns in diameter) can be positively detected. The method is applicable to laboratory and commercial-type seals formed by a hot bar against an unheated rubber anvil. Poor results were obtained with ultrasonic seals and inconclusive results with dual-heated element sealers.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 1968
Accession Number
AD0676152

Entities

People

  • Frank Fiori
  • Kwoh H. Hu
  • Rauno A. Lampi

Organizations

  • United States Army Soldier Systems Center

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Air Flow
  • Background Noise
  • Composite Materials
  • Detection
  • Diameters
  • Dwell Time
  • Elements
  • Engineering
  • Food
  • Infrared Scanning
  • Materials
  • Measurement
  • Production
  • Scanning
  • Standards
  • Thermal Radiation
  • Vegetables

Readers

  • Electrical Engineering
  • Industrial Economics
  • Thermal Physics or Thermal Science.