Properties

 

The microporosity of the internal structure of the pearl film (decreased density) ensures its highest packaging efficiency, as compared with other offered types of polypropylene films with the like thickness. The pearly appearance, opalescence and a high degree of non-transparency guarantee its attractiveness as packaging material. By standard, it is offered as pearly-white film, one-side activated, with the activation at the outer side of the roll. The use of outer weldable layers enables its welding below the polypropylene melting point. The selection of welding temperatures depends on the characteristics of welding electrodes and welding rate.

 

Application

 

The oriented polypropylene pearly film is intended to be used directly as a component of multilayer films, with possible surprint or metallization of its surface. The unfavourable estimation of the surprint adherence, made with the use of a self-adhesive tape, on the surface of pearly film, is not a criterion which disqualifies it from further use (packaging etc), because of its microporous structure.

 

Technical data  

 

Requirements

Value
Nominal thickness, [mm] Admissible deviation +/- 5%

35

40
Density [g/cm3]

0,75

Tearing strength, [N/mm2]  
  - longwise, not less than  
  - crosswise, not less than


60
120
Ultimate elongation, [%]  
  - longwise, not less than
  - crosswise, not less than


140
40
Thermal shrinkage, [%]
  - longwise, not less than
  - crosswise, not less than


3,5
2,0
Friction factor, (film/metal) not more than

0,4
Opacity, not more than, [%]

60

65
Activation level, [mN/m]

38
Substance, [g/m2]

25,5

29,2
Packaging effectiveness [m2/kg]

39,2

34,2