Transparency of polymeric food packaging materials

Transparency is a very important technical parameter to evaluate and validate certain food packaging materials. In the recent scientific literature, several methods (i.e. transmittance, opacity, haze, and absorbance) have been used and such variety hinders a direct comparison of results from different authors. In this Review, we describe and discuss the most widely employed methods to measure transparency, with special emphasis on two main parameters: transmittance and opacity. Moreover, a comparison of the different techniques is addressed and the typical values of transmittance and opacity of common transparent food packaging materials are provided. Our current opinion is that transparency should be…

• MD
  Ministerio de Ciencia, Innovación y Universidades

  Award: RYC2018-025079-I/AEI/10.13039/501100011033
• CD
  Consejería de Transformación Económica, Industria, Conocimiento y Universidades
• JD
  Junta de Andalucía

  Award: POSTDOC_21_00008
• CD
  Consejería de Conocimiento, Investigación y Universidad, Junta de Andalucía
• CS
  Consejo Superior de Investigaciones Científicas

  Award: 202040E003
• ES
  European Social Fund