Canning and Fish Packaging Technology

Unit 13 - Paper and Board

13.1.5.Boards for food packaging

• Solid white board produced from bleached chemical wood pulp.
• Folding Box board (Duplex or Triplex).

• Duplex: The liner is produced from the bleached chemical wood pulp and the remainder of the board from unbleached mechanical wood pulp (ground wood).
  

Other board grades used for food packaging

• Triplex: Outer liners are from bleached chemical wood pulp and the middle layer is from ground wood pulp.

• Chip board: All plies of chipboard are made from recycled waste paper and has natural grey colour. Not suitable for direct contact with food stuffs. It has poor printing surface.
• White lined chipboard: White lined chipboard has inner plies of recycled waste paper; the outer liner is bleached chemical pulp. This is not suitable for direct exposure to food products which are susceptible to odour and taint. This may be used for food packaging if the product is pre-wrapped (for dry products such as corn flakes). The liner gives a good white printing surface, e.g. Kraft lined chip board: Virgin kraft liner on chip board gives enhanced strength and appearance and suitable as an outer carton for distribution of confectionery and ice cream products.

In addition to all these there are different grades of board depending on coating mentioned earlier.