Generally speaking, there is no difference between PU film and TPU film above 0.03mm. It is customary for many people to call thick and thin TPU films PU films, especially some shoe factories and printing factories.
PU film below 0.03 and TPU film are completely different.
PU film is made by coating process and reacted with solvent. It can be made very thin, but it is very difficult to make it above 0.025mm.
The TPU film is generally made by blown film or casting or even calendering. The thickness can be 0.01-2.5mm. In addition, it may be seen See the traces when the TPU material is heated, melted and flowed.
PU The film has good softness and has high moisture permeability due to its thinness and evaporation of solvent.
TPU film uses a hydrophilic base to achieve moisture permeability. The highly moisture-permeable TPU film also has very high moisture permeability.
Because the PU film is lined with a backing paper, the backing paper has a high degree of matte, so the PU is very matte and matte.
TPU film can be made into a matte surface, but it is still difficult to achieve an extremely matte surface.
The specific gravity of PU film is about 0.9.
The specific gravity of TPU film is about 1.2.
PU film is easy to make into colored products.
TPU film for colored products requires a relatively high minimum order quantity. The main reason is that the former is coated and the latter requires cleaning of the screw!
PU film is mostly used in leather, clothing and medical and health fields.
TPU film is mostly used in shoe materials, bag materials, clothing and inflatable products.
PU Due to solvent reasons, the film is not as environmentally friendly as the TPU film.
PU film is thermosetting and cannot be processed twice.
TPU film is thermoplastic and can be processed twice or even multiple times.
For films of the same thickness, PU film is much more expensive than TPU film.