Seal bond characterization of laminated plastic food cups by scanning electron and optic microscopes
Yükleniyor...
Tarih
2004
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
John Wiley & Sons Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Heat seals of laminated semi-rigid food cups were evaluated to characterize the seal bond. Laminated lidding material was sealed at temperatures of 160-180degreesC to thermoformed cups. Various seal regions of the cups with different ultrasonic signal strengths (%) were sectioned at the rim and examined using optical and scanning electron microscopes (SEM). Ultrasonic signals were able to pinpoint seal defects; however, the magnitude of the signals did not relate to the actual seal condition or seal quality affected by the sealing process. This was attributed to the very short seal width and non-parallel surface of the heat seal, which possibly resulted in signal loss by reflection and scattering from the seal surface. C-scan of ultrasound, SEM and optical microscopic images provided the information that the heat-sealing process was unstable, due to insufficient and non-uniform heat-seal temperature or pressure, misalignment of the sealing jaws or non-parallel sealing or cutting unit configuration. Copyright (C) 2004 John Wiley Sons, Ltd.
Açıklama
Anahtar Kelimeler
scanning electron microscope, heat seal, seal characterization, optical microscopic imaging, ultrasonic imaging
Kaynak
Packaging Technology and Science
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
17
Sayı
4
