6.9.1.5 Liquid polyurethane (PU)

Also known as flexible packaging, liquid PU is commonly used for food packaging. Films from different materials are bonded to create a package that preserves food; film selections are important because they need to provide the required attributes for the food product.

Figure 202 Common films bonded with liquid polyurethanes
Figure 203 Laminating machine
Figure 204 Flexible packaging examples

6.9.2 Equipment Considerations

Water-based adhesives are versatile and can be applied in different ways:

  • spray gun
  • roller
  • nozzles
  • nozzle activated by a pressure system
  • nozzle activated by an electronic system
  • manual: brush, spatula, etc.
Figure 205 Common application systems for liquid PU adhesives

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