porous polypropylene film roll

porous polypropylene film roll

  • CN 102,575,038 B
  • Filed: 09/13/2010
  • Issued: 01/06/2016
  • Est. Priority Date: 10/07/2009
  • Status: Active Grant
First Claim
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1. a porous polypropylene film roll, by by containing acrylic resin, overall average porosity ε

  • ave be 45 ~ 90% porous polypropylene film be wrapped on core and form, film total thickness is 12 ~ 30 μ

    m, and the uneven degree of porosity is 0 ~ 0.08,It is the thickness variation in the film length direction that formula [1] calculates is the porous polypropylene film roll of less than 15%,Thickness variation (%)=(Tmax-Tmin)/Tave ×

    100 [1]Wherein,Tave;

    in the longitudinal direction with the mean thickness during thickness of 30mm measuring space 100,Tmax;

    in the longitudinal direction with the maximum ga(u)ge during thickness of 30mm measuring space 100,Tmin;

    in the longitudinal direction with the minimum thickness during thickness of 30mm measuring space 100,The thickness of film is the disk using diameter 10mm at the mensuration head as dial indicator, uses the counterweight of 100g as load, measures under mensuration pressure 12.5kPa condition,The uneven degree of described porosity, by in the longitudinal direction with the porosity of 50mm measuring space 60, will most high porosity be set to ε

    max, minimum porosity is set to ε

    min, overall average porosity is set to ε

    ave, the value represented by (ε

    max-ε

    min)/ε

    ave.

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