Canning and Fish Packaging Technology

Unit 9 - Plastics for Packaging

9.3.9.Each film designated using codes
Though varying quality cellulose acetate has been prepared, a great deal of standardization has been done and each type film is designated by using codes as follows.
P – Basic films non moisture proof and Non heat sealable.
M – Nitrocellulose coated on both sides moisture proof.
S – Heat sealable.
MS – Heat sealable, moisture proof.
QM – Nitrocellulose coated on both sides but less moisture proof than QM,
PS – Nitrocellulose coated on both sides but less moisture proof than GM.
DM – Nitrocellulose coated on our side.
MXXT/A- PVDC coated our both sides by aqueous dispersion
MXXT/5 – PVDC copolymer coated by solvent process on both sides.
B – Opaque
C – Coloured – Name of the colour follows
F – for twist wrap.