Plastic gas barrier packaging laminate
A gas barrier packaging laminate (10) having durability to stress crack formation and yet a bending stiffness and good integrity between the laminate layers, comprising outer layers of heat-sealable polyolefin (16, 17), two polymer carrier layers (11, 12) each being coated with a SiOx gas barrier layer (13, 14), and an intermediate polymer layer (15) that comprises at least first (15a) and second (15b) part-layers, whereof said first part-layer (15a) has a higher stiffness than said second part-layer (15b) and said second part-layer (15b) has higher elastomeric properties than said first part-layer (15a). A stiff structural sandwich construction is formed by the two stiff carrier layers separated by the intermediate layer that is also shock absorbing to prevent stress-cracking of the SiOx layers. The invention also relates to a packaging container manufactured from the packaging laminate and to a method of manufacturing of the packaging laminate.
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Publication date: 01-31-2007
Applicant: TETRA LAVAL HOLDINGS & FINANCE (CH)
Inventor: OLOFSSON TORSTEN (CH); BUERKI MONIKA (CH)
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